mirror of https://gitee.com/openkylin/linux.git
4979 lines
140 KiB
C
4979 lines
140 KiB
C
/*
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* linux/fs/ext4/super.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/inode.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* Big-endian to little-endian byte-swapping/bitmaps by
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* David S. Miller (davem@caip.rutgers.edu), 1995
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/time.h>
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#include <linux/vmalloc.h>
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#include <linux/jbd2.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/parser.h>
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#include <linux/buffer_head.h>
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#include <linux/exportfs.h>
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#include <linux/vfs.h>
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#include <linux/random.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/quotaops.h>
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include <linux/ctype.h>
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#include <linux/log2.h>
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#include <linux/crc16.h>
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#include <linux/cleancache.h>
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#include <asm/uaccess.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include "ext4.h"
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#include "ext4_extents.h"
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#include "ext4_jbd2.h"
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#include "xattr.h"
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#include "acl.h"
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#include "mballoc.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/ext4.h>
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static struct proc_dir_entry *ext4_proc_root;
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static struct kset *ext4_kset;
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static struct ext4_lazy_init *ext4_li_info;
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static struct mutex ext4_li_mtx;
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static struct ext4_features *ext4_feat;
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static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
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unsigned long journal_devnum);
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static int ext4_show_options(struct seq_file *seq, struct dentry *root);
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static int ext4_commit_super(struct super_block *sb, int sync);
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static void ext4_mark_recovery_complete(struct super_block *sb,
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struct ext4_super_block *es);
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static void ext4_clear_journal_err(struct super_block *sb,
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struct ext4_super_block *es);
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static int ext4_sync_fs(struct super_block *sb, int wait);
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static const char *ext4_decode_error(struct super_block *sb, int errno,
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char nbuf[16]);
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static int ext4_remount(struct super_block *sb, int *flags, char *data);
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static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int ext4_unfreeze(struct super_block *sb);
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static void ext4_write_super(struct super_block *sb);
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static int ext4_freeze(struct super_block *sb);
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static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
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const char *dev_name, void *data);
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static inline int ext2_feature_set_ok(struct super_block *sb);
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static inline int ext3_feature_set_ok(struct super_block *sb);
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static int ext4_feature_set_ok(struct super_block *sb, int readonly);
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static void ext4_destroy_lazyinit_thread(void);
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static void ext4_unregister_li_request(struct super_block *sb);
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static void ext4_clear_request_list(void);
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#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
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static struct file_system_type ext2_fs_type = {
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.owner = THIS_MODULE,
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.name = "ext2",
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.mount = ext4_mount,
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.kill_sb = kill_block_super,
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.fs_flags = FS_REQUIRES_DEV,
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};
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#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
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#else
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#define IS_EXT2_SB(sb) (0)
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#endif
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#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
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static struct file_system_type ext3_fs_type = {
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.owner = THIS_MODULE,
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.name = "ext3",
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.mount = ext4_mount,
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.kill_sb = kill_block_super,
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.fs_flags = FS_REQUIRES_DEV,
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};
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#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
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#else
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#define IS_EXT3_SB(sb) (0)
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#endif
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void *ext4_kvmalloc(size_t size, gfp_t flags)
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{
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void *ret;
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ret = kmalloc(size, flags);
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if (!ret)
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ret = __vmalloc(size, flags, PAGE_KERNEL);
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return ret;
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}
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void *ext4_kvzalloc(size_t size, gfp_t flags)
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{
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void *ret;
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ret = kzalloc(size, flags);
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if (!ret)
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ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
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return ret;
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}
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void ext4_kvfree(void *ptr)
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{
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if (is_vmalloc_addr(ptr))
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vfree(ptr);
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else
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kfree(ptr);
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}
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ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
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struct ext4_group_desc *bg)
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{
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return le32_to_cpu(bg->bg_block_bitmap_lo) |
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(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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(ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
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}
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ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
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struct ext4_group_desc *bg)
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{
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return le32_to_cpu(bg->bg_inode_bitmap_lo) |
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(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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(ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
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}
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ext4_fsblk_t ext4_inode_table(struct super_block *sb,
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struct ext4_group_desc *bg)
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{
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return le32_to_cpu(bg->bg_inode_table_lo) |
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(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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(ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
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}
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__u32 ext4_free_group_clusters(struct super_block *sb,
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struct ext4_group_desc *bg)
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{
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return le16_to_cpu(bg->bg_free_blocks_count_lo) |
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(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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(__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
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}
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__u32 ext4_free_inodes_count(struct super_block *sb,
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struct ext4_group_desc *bg)
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{
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return le16_to_cpu(bg->bg_free_inodes_count_lo) |
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(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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(__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
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}
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__u32 ext4_used_dirs_count(struct super_block *sb,
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struct ext4_group_desc *bg)
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{
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return le16_to_cpu(bg->bg_used_dirs_count_lo) |
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(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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(__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
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}
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__u32 ext4_itable_unused_count(struct super_block *sb,
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struct ext4_group_desc *bg)
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{
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return le16_to_cpu(bg->bg_itable_unused_lo) |
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(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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(__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
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}
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void ext4_block_bitmap_set(struct super_block *sb,
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struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
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if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
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bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
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}
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void ext4_inode_bitmap_set(struct super_block *sb,
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struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
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if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
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bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
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}
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void ext4_inode_table_set(struct super_block *sb,
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struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
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if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
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bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
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}
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void ext4_free_group_clusters_set(struct super_block *sb,
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struct ext4_group_desc *bg, __u32 count)
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{
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bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
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if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
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bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
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}
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void ext4_free_inodes_set(struct super_block *sb,
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struct ext4_group_desc *bg, __u32 count)
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{
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bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
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if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
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bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
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}
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void ext4_used_dirs_set(struct super_block *sb,
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struct ext4_group_desc *bg, __u32 count)
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{
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bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
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if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
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bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
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}
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void ext4_itable_unused_set(struct super_block *sb,
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struct ext4_group_desc *bg, __u32 count)
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{
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bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
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if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
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bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
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}
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/* Just increment the non-pointer handle value */
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static handle_t *ext4_get_nojournal(void)
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{
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handle_t *handle = current->journal_info;
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unsigned long ref_cnt = (unsigned long)handle;
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BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
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ref_cnt++;
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handle = (handle_t *)ref_cnt;
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current->journal_info = handle;
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return handle;
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}
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/* Decrement the non-pointer handle value */
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static void ext4_put_nojournal(handle_t *handle)
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{
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unsigned long ref_cnt = (unsigned long)handle;
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BUG_ON(ref_cnt == 0);
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ref_cnt--;
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handle = (handle_t *)ref_cnt;
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current->journal_info = handle;
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}
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/*
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* Wrappers for jbd2_journal_start/end.
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*
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* The only special thing we need to do here is to make sure that all
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* journal_end calls result in the superblock being marked dirty, so
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* that sync() will call the filesystem's write_super callback if
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* appropriate.
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*
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* To avoid j_barrier hold in userspace when a user calls freeze(),
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* ext4 prevents a new handle from being started by s_frozen, which
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* is in an upper layer.
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*/
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handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
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{
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journal_t *journal;
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handle_t *handle;
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trace_ext4_journal_start(sb, nblocks, _RET_IP_);
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if (sb->s_flags & MS_RDONLY)
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return ERR_PTR(-EROFS);
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journal = EXT4_SB(sb)->s_journal;
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handle = ext4_journal_current_handle();
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/*
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* If a handle has been started, it should be allowed to
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* finish, otherwise deadlock could happen between freeze
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* and others(e.g. truncate) due to the restart of the
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* journal handle if the filesystem is forzen and active
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* handles are not stopped.
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*/
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if (!handle)
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vfs_check_frozen(sb, SB_FREEZE_TRANS);
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if (!journal)
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return ext4_get_nojournal();
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/*
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* Special case here: if the journal has aborted behind our
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* backs (eg. EIO in the commit thread), then we still need to
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* take the FS itself readonly cleanly.
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*/
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if (is_journal_aborted(journal)) {
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ext4_abort(sb, "Detected aborted journal");
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return ERR_PTR(-EROFS);
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}
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return jbd2_journal_start(journal, nblocks);
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}
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/*
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* The only special thing we need to do here is to make sure that all
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* jbd2_journal_stop calls result in the superblock being marked dirty, so
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* that sync() will call the filesystem's write_super callback if
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* appropriate.
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*/
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int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
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{
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struct super_block *sb;
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int err;
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int rc;
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if (!ext4_handle_valid(handle)) {
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ext4_put_nojournal(handle);
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return 0;
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}
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sb = handle->h_transaction->t_journal->j_private;
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err = handle->h_err;
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rc = jbd2_journal_stop(handle);
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if (!err)
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err = rc;
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if (err)
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__ext4_std_error(sb, where, line, err);
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return err;
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}
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void ext4_journal_abort_handle(const char *caller, unsigned int line,
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const char *err_fn, struct buffer_head *bh,
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handle_t *handle, int err)
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{
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char nbuf[16];
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const char *errstr = ext4_decode_error(NULL, err, nbuf);
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BUG_ON(!ext4_handle_valid(handle));
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if (bh)
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BUFFER_TRACE(bh, "abort");
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if (!handle->h_err)
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handle->h_err = err;
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if (is_handle_aborted(handle))
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return;
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printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
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caller, line, errstr, err_fn);
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jbd2_journal_abort_handle(handle);
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}
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static void __save_error_info(struct super_block *sb, const char *func,
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unsigned int line)
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{
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struct ext4_super_block *es = EXT4_SB(sb)->s_es;
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EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
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es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
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es->s_last_error_time = cpu_to_le32(get_seconds());
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strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
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es->s_last_error_line = cpu_to_le32(line);
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if (!es->s_first_error_time) {
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es->s_first_error_time = es->s_last_error_time;
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strncpy(es->s_first_error_func, func,
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sizeof(es->s_first_error_func));
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es->s_first_error_line = cpu_to_le32(line);
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es->s_first_error_ino = es->s_last_error_ino;
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es->s_first_error_block = es->s_last_error_block;
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}
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/*
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* Start the daily error reporting function if it hasn't been
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* started already
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*/
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if (!es->s_error_count)
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mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
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es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
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}
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static void save_error_info(struct super_block *sb, const char *func,
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unsigned int line)
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{
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__save_error_info(sb, func, line);
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ext4_commit_super(sb, 1);
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}
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/*
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* The del_gendisk() function uninitializes the disk-specific data
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* structures, including the bdi structure, without telling anyone
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* else. Once this happens, any attempt to call mark_buffer_dirty()
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* (for example, by ext4_commit_super), will cause a kernel OOPS.
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* This is a kludge to prevent these oops until we can put in a proper
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* hook in del_gendisk() to inform the VFS and file system layers.
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*/
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static int block_device_ejected(struct super_block *sb)
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{
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struct inode *bd_inode = sb->s_bdev->bd_inode;
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struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
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return bdi->dev == NULL;
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}
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static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
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{
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struct super_block *sb = journal->j_private;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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int error = is_journal_aborted(journal);
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struct ext4_journal_cb_entry *jce, *tmp;
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spin_lock(&sbi->s_md_lock);
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list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
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list_del_init(&jce->jce_list);
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spin_unlock(&sbi->s_md_lock);
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jce->jce_func(sb, jce, error);
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spin_lock(&sbi->s_md_lock);
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}
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spin_unlock(&sbi->s_md_lock);
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}
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/* Deal with the reporting of failure conditions on a filesystem such as
|
|
* inconsistencies detected or read IO failures.
|
|
*
|
|
* On ext2, we can store the error state of the filesystem in the
|
|
* superblock. That is not possible on ext4, because we may have other
|
|
* write ordering constraints on the superblock which prevent us from
|
|
* writing it out straight away; and given that the journal is about to
|
|
* be aborted, we can't rely on the current, or future, transactions to
|
|
* write out the superblock safely.
|
|
*
|
|
* We'll just use the jbd2_journal_abort() error code to record an error in
|
|
* the journal instead. On recovery, the journal will complain about
|
|
* that error until we've noted it down and cleared it.
|
|
*/
|
|
|
|
static void ext4_handle_error(struct super_block *sb)
|
|
{
|
|
if (sb->s_flags & MS_RDONLY)
|
|
return;
|
|
|
|
if (!test_opt(sb, ERRORS_CONT)) {
|
|
journal_t *journal = EXT4_SB(sb)->s_journal;
|
|
|
|
EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
|
|
if (journal)
|
|
jbd2_journal_abort(journal, -EIO);
|
|
}
|
|
if (test_opt(sb, ERRORS_RO)) {
|
|
ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
|
|
sb->s_flags |= MS_RDONLY;
|
|
}
|
|
if (test_opt(sb, ERRORS_PANIC))
|
|
panic("EXT4-fs (device %s): panic forced after error\n",
|
|
sb->s_id);
|
|
}
|
|
|
|
void __ext4_error(struct super_block *sb, const char *function,
|
|
unsigned int line, const char *fmt, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
|
|
sb->s_id, function, line, current->comm, &vaf);
|
|
va_end(args);
|
|
|
|
ext4_handle_error(sb);
|
|
}
|
|
|
|
void ext4_error_inode(struct inode *inode, const char *function,
|
|
unsigned int line, ext4_fsblk_t block,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
struct va_format vaf;
|
|
struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
|
|
|
|
es->s_last_error_ino = cpu_to_le32(inode->i_ino);
|
|
es->s_last_error_block = cpu_to_le64(block);
|
|
save_error_info(inode->i_sb, function, line);
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
if (block)
|
|
printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
|
|
"inode #%lu: block %llu: comm %s: %pV\n",
|
|
inode->i_sb->s_id, function, line, inode->i_ino,
|
|
block, current->comm, &vaf);
|
|
else
|
|
printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
|
|
"inode #%lu: comm %s: %pV\n",
|
|
inode->i_sb->s_id, function, line, inode->i_ino,
|
|
current->comm, &vaf);
|
|
va_end(args);
|
|
|
|
ext4_handle_error(inode->i_sb);
|
|
}
|
|
|
|
void ext4_error_file(struct file *file, const char *function,
|
|
unsigned int line, ext4_fsblk_t block,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
struct va_format vaf;
|
|
struct ext4_super_block *es;
|
|
struct inode *inode = file->f_dentry->d_inode;
|
|
char pathname[80], *path;
|
|
|
|
es = EXT4_SB(inode->i_sb)->s_es;
|
|
es->s_last_error_ino = cpu_to_le32(inode->i_ino);
|
|
save_error_info(inode->i_sb, function, line);
|
|
path = d_path(&(file->f_path), pathname, sizeof(pathname));
|
|
if (IS_ERR(path))
|
|
path = "(unknown)";
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
if (block)
|
|
printk(KERN_CRIT
|
|
"EXT4-fs error (device %s): %s:%d: inode #%lu: "
|
|
"block %llu: comm %s: path %s: %pV\n",
|
|
inode->i_sb->s_id, function, line, inode->i_ino,
|
|
block, current->comm, path, &vaf);
|
|
else
|
|
printk(KERN_CRIT
|
|
"EXT4-fs error (device %s): %s:%d: inode #%lu: "
|
|
"comm %s: path %s: %pV\n",
|
|
inode->i_sb->s_id, function, line, inode->i_ino,
|
|
current->comm, path, &vaf);
|
|
va_end(args);
|
|
|
|
ext4_handle_error(inode->i_sb);
|
|
}
|
|
|
|
static const char *ext4_decode_error(struct super_block *sb, int errno,
|
|
char nbuf[16])
|
|
{
|
|
char *errstr = NULL;
|
|
|
|
switch (errno) {
|
|
case -EIO:
|
|
errstr = "IO failure";
|
|
break;
|
|
case -ENOMEM:
|
|
errstr = "Out of memory";
|
|
break;
|
|
case -EROFS:
|
|
if (!sb || (EXT4_SB(sb)->s_journal &&
|
|
EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
|
|
errstr = "Journal has aborted";
|
|
else
|
|
errstr = "Readonly filesystem";
|
|
break;
|
|
default:
|
|
/* If the caller passed in an extra buffer for unknown
|
|
* errors, textualise them now. Else we just return
|
|
* NULL. */
|
|
if (nbuf) {
|
|
/* Check for truncated error codes... */
|
|
if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
|
|
errstr = nbuf;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return errstr;
|
|
}
|
|
|
|
/* __ext4_std_error decodes expected errors from journaling functions
|
|
* automatically and invokes the appropriate error response. */
|
|
|
|
void __ext4_std_error(struct super_block *sb, const char *function,
|
|
unsigned int line, int errno)
|
|
{
|
|
char nbuf[16];
|
|
const char *errstr;
|
|
|
|
/* Special case: if the error is EROFS, and we're not already
|
|
* inside a transaction, then there's really no point in logging
|
|
* an error. */
|
|
if (errno == -EROFS && journal_current_handle() == NULL &&
|
|
(sb->s_flags & MS_RDONLY))
|
|
return;
|
|
|
|
errstr = ext4_decode_error(sb, errno, nbuf);
|
|
printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
|
|
sb->s_id, function, line, errstr);
|
|
save_error_info(sb, function, line);
|
|
|
|
ext4_handle_error(sb);
|
|
}
|
|
|
|
/*
|
|
* ext4_abort is a much stronger failure handler than ext4_error. The
|
|
* abort function may be used to deal with unrecoverable failures such
|
|
* as journal IO errors or ENOMEM at a critical moment in log management.
|
|
*
|
|
* We unconditionally force the filesystem into an ABORT|READONLY state,
|
|
* unless the error response on the fs has been set to panic in which
|
|
* case we take the easy way out and panic immediately.
|
|
*/
|
|
|
|
void __ext4_abort(struct super_block *sb, const char *function,
|
|
unsigned int line, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
save_error_info(sb, function, line);
|
|
va_start(args, fmt);
|
|
printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
|
|
function, line);
|
|
vprintk(fmt, args);
|
|
printk("\n");
|
|
va_end(args);
|
|
|
|
if ((sb->s_flags & MS_RDONLY) == 0) {
|
|
ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
|
|
sb->s_flags |= MS_RDONLY;
|
|
EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
|
|
if (EXT4_SB(sb)->s_journal)
|
|
jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
|
|
save_error_info(sb, function, line);
|
|
}
|
|
if (test_opt(sb, ERRORS_PANIC))
|
|
panic("EXT4-fs panic from previous error\n");
|
|
}
|
|
|
|
void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
|
|
va_end(args);
|
|
}
|
|
|
|
void __ext4_warning(struct super_block *sb, const char *function,
|
|
unsigned int line, const char *fmt, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
|
|
sb->s_id, function, line, &vaf);
|
|
va_end(args);
|
|
}
|
|
|
|
void __ext4_grp_locked_error(const char *function, unsigned int line,
|
|
struct super_block *sb, ext4_group_t grp,
|
|
unsigned long ino, ext4_fsblk_t block,
|
|
const char *fmt, ...)
|
|
__releases(bitlock)
|
|
__acquires(bitlock)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
struct ext4_super_block *es = EXT4_SB(sb)->s_es;
|
|
|
|
es->s_last_error_ino = cpu_to_le32(ino);
|
|
es->s_last_error_block = cpu_to_le64(block);
|
|
__save_error_info(sb, function, line);
|
|
|
|
va_start(args, fmt);
|
|
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
|
|
sb->s_id, function, line, grp);
|
|
if (ino)
|
|
printk(KERN_CONT "inode %lu: ", ino);
|
|
if (block)
|
|
printk(KERN_CONT "block %llu:", (unsigned long long) block);
|
|
printk(KERN_CONT "%pV\n", &vaf);
|
|
va_end(args);
|
|
|
|
if (test_opt(sb, ERRORS_CONT)) {
|
|
ext4_commit_super(sb, 0);
|
|
return;
|
|
}
|
|
|
|
ext4_unlock_group(sb, grp);
|
|
ext4_handle_error(sb);
|
|
/*
|
|
* We only get here in the ERRORS_RO case; relocking the group
|
|
* may be dangerous, but nothing bad will happen since the
|
|
* filesystem will have already been marked read/only and the
|
|
* journal has been aborted. We return 1 as a hint to callers
|
|
* who might what to use the return value from
|
|
* ext4_grp_locked_error() to distinguish between the
|
|
* ERRORS_CONT and ERRORS_RO case, and perhaps return more
|
|
* aggressively from the ext4 function in question, with a
|
|
* more appropriate error code.
|
|
*/
|
|
ext4_lock_group(sb, grp);
|
|
return;
|
|
}
|
|
|
|
void ext4_update_dynamic_rev(struct super_block *sb)
|
|
{
|
|
struct ext4_super_block *es = EXT4_SB(sb)->s_es;
|
|
|
|
if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
|
|
return;
|
|
|
|
ext4_warning(sb,
|
|
"updating to rev %d because of new feature flag, "
|
|
"running e2fsck is recommended",
|
|
EXT4_DYNAMIC_REV);
|
|
|
|
es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
|
|
es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
|
|
es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
|
|
/* leave es->s_feature_*compat flags alone */
|
|
/* es->s_uuid will be set by e2fsck if empty */
|
|
|
|
/*
|
|
* The rest of the superblock fields should be zero, and if not it
|
|
* means they are likely already in use, so leave them alone. We
|
|
* can leave it up to e2fsck to clean up any inconsistencies there.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* Open the external journal device
|
|
*/
|
|
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
|
|
{
|
|
struct block_device *bdev;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
|
|
if (IS_ERR(bdev))
|
|
goto fail;
|
|
return bdev;
|
|
|
|
fail:
|
|
ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
|
|
__bdevname(dev, b), PTR_ERR(bdev));
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Release the journal device
|
|
*/
|
|
static int ext4_blkdev_put(struct block_device *bdev)
|
|
{
|
|
return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
|
|
}
|
|
|
|
static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
|
|
{
|
|
struct block_device *bdev;
|
|
int ret = -ENODEV;
|
|
|
|
bdev = sbi->journal_bdev;
|
|
if (bdev) {
|
|
ret = ext4_blkdev_put(bdev);
|
|
sbi->journal_bdev = NULL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static inline struct inode *orphan_list_entry(struct list_head *l)
|
|
{
|
|
return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
|
|
}
|
|
|
|
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
|
|
{
|
|
struct list_head *l;
|
|
|
|
ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
|
|
le32_to_cpu(sbi->s_es->s_last_orphan));
|
|
|
|
printk(KERN_ERR "sb_info orphan list:\n");
|
|
list_for_each(l, &sbi->s_orphan) {
|
|
struct inode *inode = orphan_list_entry(l);
|
|
printk(KERN_ERR " "
|
|
"inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
|
|
inode->i_sb->s_id, inode->i_ino, inode,
|
|
inode->i_mode, inode->i_nlink,
|
|
NEXT_ORPHAN(inode));
|
|
}
|
|
}
|
|
|
|
static void ext4_put_super(struct super_block *sb)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
int i, err;
|
|
|
|
ext4_unregister_li_request(sb);
|
|
dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
|
|
|
|
flush_workqueue(sbi->dio_unwritten_wq);
|
|
destroy_workqueue(sbi->dio_unwritten_wq);
|
|
|
|
lock_super(sb);
|
|
if (sbi->s_journal) {
|
|
err = jbd2_journal_destroy(sbi->s_journal);
|
|
sbi->s_journal = NULL;
|
|
if (err < 0)
|
|
ext4_abort(sb, "Couldn't clean up the journal");
|
|
}
|
|
|
|
del_timer(&sbi->s_err_report);
|
|
ext4_release_system_zone(sb);
|
|
ext4_mb_release(sb);
|
|
ext4_ext_release(sb);
|
|
ext4_xattr_put_super(sb);
|
|
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
|
es->s_state = cpu_to_le16(sbi->s_mount_state);
|
|
}
|
|
if (sb->s_dirt || !(sb->s_flags & MS_RDONLY))
|
|
ext4_commit_super(sb, 1);
|
|
|
|
if (sbi->s_proc) {
|
|
remove_proc_entry("options", sbi->s_proc);
|
|
remove_proc_entry(sb->s_id, ext4_proc_root);
|
|
}
|
|
kobject_del(&sbi->s_kobj);
|
|
|
|
for (i = 0; i < sbi->s_gdb_count; i++)
|
|
brelse(sbi->s_group_desc[i]);
|
|
ext4_kvfree(sbi->s_group_desc);
|
|
ext4_kvfree(sbi->s_flex_groups);
|
|
percpu_counter_destroy(&sbi->s_freeclusters_counter);
|
|
percpu_counter_destroy(&sbi->s_freeinodes_counter);
|
|
percpu_counter_destroy(&sbi->s_dirs_counter);
|
|
percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
|
|
brelse(sbi->s_sbh);
|
|
#ifdef CONFIG_QUOTA
|
|
for (i = 0; i < MAXQUOTAS; i++)
|
|
kfree(sbi->s_qf_names[i]);
|
|
#endif
|
|
|
|
/* Debugging code just in case the in-memory inode orphan list
|
|
* isn't empty. The on-disk one can be non-empty if we've
|
|
* detected an error and taken the fs readonly, but the
|
|
* in-memory list had better be clean by this point. */
|
|
if (!list_empty(&sbi->s_orphan))
|
|
dump_orphan_list(sb, sbi);
|
|
J_ASSERT(list_empty(&sbi->s_orphan));
|
|
|
|
invalidate_bdev(sb->s_bdev);
|
|
if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
|
|
/*
|
|
* Invalidate the journal device's buffers. We don't want them
|
|
* floating about in memory - the physical journal device may
|
|
* hotswapped, and it breaks the `ro-after' testing code.
|
|
*/
|
|
sync_blockdev(sbi->journal_bdev);
|
|
invalidate_bdev(sbi->journal_bdev);
|
|
ext4_blkdev_remove(sbi);
|
|
}
|
|
if (sbi->s_mmp_tsk)
|
|
kthread_stop(sbi->s_mmp_tsk);
|
|
sb->s_fs_info = NULL;
|
|
/*
|
|
* Now that we are completely done shutting down the
|
|
* superblock, we need to actually destroy the kobject.
|
|
*/
|
|
unlock_super(sb);
|
|
kobject_put(&sbi->s_kobj);
|
|
wait_for_completion(&sbi->s_kobj_unregister);
|
|
kfree(sbi->s_blockgroup_lock);
|
|
kfree(sbi);
|
|
}
|
|
|
|
static struct kmem_cache *ext4_inode_cachep;
|
|
|
|
/*
|
|
* Called inside transaction, so use GFP_NOFS
|
|
*/
|
|
static struct inode *ext4_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct ext4_inode_info *ei;
|
|
|
|
ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
|
|
if (!ei)
|
|
return NULL;
|
|
|
|
ei->vfs_inode.i_version = 1;
|
|
ei->vfs_inode.i_data.writeback_index = 0;
|
|
memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
|
|
INIT_LIST_HEAD(&ei->i_prealloc_list);
|
|
spin_lock_init(&ei->i_prealloc_lock);
|
|
ei->i_reserved_data_blocks = 0;
|
|
ei->i_reserved_meta_blocks = 0;
|
|
ei->i_allocated_meta_blocks = 0;
|
|
ei->i_da_metadata_calc_len = 0;
|
|
spin_lock_init(&(ei->i_block_reservation_lock));
|
|
#ifdef CONFIG_QUOTA
|
|
ei->i_reserved_quota = 0;
|
|
#endif
|
|
ei->jinode = NULL;
|
|
INIT_LIST_HEAD(&ei->i_completed_io_list);
|
|
spin_lock_init(&ei->i_completed_io_lock);
|
|
ei->cur_aio_dio = NULL;
|
|
ei->i_sync_tid = 0;
|
|
ei->i_datasync_tid = 0;
|
|
atomic_set(&ei->i_ioend_count, 0);
|
|
atomic_set(&ei->i_aiodio_unwritten, 0);
|
|
|
|
return &ei->vfs_inode;
|
|
}
|
|
|
|
static int ext4_drop_inode(struct inode *inode)
|
|
{
|
|
int drop = generic_drop_inode(inode);
|
|
|
|
trace_ext4_drop_inode(inode, drop);
|
|
return drop;
|
|
}
|
|
|
|
static void ext4_i_callback(struct rcu_head *head)
|
|
{
|
|
struct inode *inode = container_of(head, struct inode, i_rcu);
|
|
kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
|
|
}
|
|
|
|
static void ext4_destroy_inode(struct inode *inode)
|
|
{
|
|
if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
|
|
ext4_msg(inode->i_sb, KERN_ERR,
|
|
"Inode %lu (%p): orphan list check failed!",
|
|
inode->i_ino, EXT4_I(inode));
|
|
print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
|
|
EXT4_I(inode), sizeof(struct ext4_inode_info),
|
|
true);
|
|
dump_stack();
|
|
}
|
|
call_rcu(&inode->i_rcu, ext4_i_callback);
|
|
}
|
|
|
|
static void init_once(void *foo)
|
|
{
|
|
struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
|
|
|
|
INIT_LIST_HEAD(&ei->i_orphan);
|
|
#ifdef CONFIG_EXT4_FS_XATTR
|
|
init_rwsem(&ei->xattr_sem);
|
|
#endif
|
|
init_rwsem(&ei->i_data_sem);
|
|
inode_init_once(&ei->vfs_inode);
|
|
}
|
|
|
|
static int init_inodecache(void)
|
|
{
|
|
ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
|
|
sizeof(struct ext4_inode_info),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD),
|
|
init_once);
|
|
if (ext4_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_inodecache(void)
|
|
{
|
|
kmem_cache_destroy(ext4_inode_cachep);
|
|
}
|
|
|
|
void ext4_clear_inode(struct inode *inode)
|
|
{
|
|
invalidate_inode_buffers(inode);
|
|
end_writeback(inode);
|
|
dquot_drop(inode);
|
|
ext4_discard_preallocations(inode);
|
|
if (EXT4_I(inode)->jinode) {
|
|
jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
|
|
EXT4_I(inode)->jinode);
|
|
jbd2_free_inode(EXT4_I(inode)->jinode);
|
|
EXT4_I(inode)->jinode = NULL;
|
|
}
|
|
}
|
|
|
|
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
|
|
u64 ino, u32 generation)
|
|
{
|
|
struct inode *inode;
|
|
|
|
if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
|
|
return ERR_PTR(-ESTALE);
|
|
if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
|
|
return ERR_PTR(-ESTALE);
|
|
|
|
/* iget isn't really right if the inode is currently unallocated!!
|
|
*
|
|
* ext4_read_inode will return a bad_inode if the inode had been
|
|
* deleted, so we should be safe.
|
|
*
|
|
* Currently we don't know the generation for parent directory, so
|
|
* a generation of 0 means "accept any"
|
|
*/
|
|
inode = ext4_iget(sb, ino);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
if (generation && inode->i_generation != generation) {
|
|
iput(inode);
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
|
|
return inode;
|
|
}
|
|
|
|
static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
|
|
ext4_nfs_get_inode);
|
|
}
|
|
|
|
static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
|
|
ext4_nfs_get_inode);
|
|
}
|
|
|
|
/*
|
|
* Try to release metadata pages (indirect blocks, directories) which are
|
|
* mapped via the block device. Since these pages could have journal heads
|
|
* which would prevent try_to_free_buffers() from freeing them, we must use
|
|
* jbd2 layer's try_to_free_buffers() function to release them.
|
|
*/
|
|
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
|
|
gfp_t wait)
|
|
{
|
|
journal_t *journal = EXT4_SB(sb)->s_journal;
|
|
|
|
WARN_ON(PageChecked(page));
|
|
if (!page_has_buffers(page))
|
|
return 0;
|
|
if (journal)
|
|
return jbd2_journal_try_to_free_buffers(journal, page,
|
|
wait & ~__GFP_WAIT);
|
|
return try_to_free_buffers(page);
|
|
}
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
|
|
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
|
|
|
|
static int ext4_write_dquot(struct dquot *dquot);
|
|
static int ext4_acquire_dquot(struct dquot *dquot);
|
|
static int ext4_release_dquot(struct dquot *dquot);
|
|
static int ext4_mark_dquot_dirty(struct dquot *dquot);
|
|
static int ext4_write_info(struct super_block *sb, int type);
|
|
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
|
|
struct path *path);
|
|
static int ext4_quota_off(struct super_block *sb, int type);
|
|
static int ext4_quota_on_mount(struct super_block *sb, int type);
|
|
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
|
|
size_t len, loff_t off);
|
|
static ssize_t ext4_quota_write(struct super_block *sb, int type,
|
|
const char *data, size_t len, loff_t off);
|
|
|
|
static const struct dquot_operations ext4_quota_operations = {
|
|
.get_reserved_space = ext4_get_reserved_space,
|
|
.write_dquot = ext4_write_dquot,
|
|
.acquire_dquot = ext4_acquire_dquot,
|
|
.release_dquot = ext4_release_dquot,
|
|
.mark_dirty = ext4_mark_dquot_dirty,
|
|
.write_info = ext4_write_info,
|
|
.alloc_dquot = dquot_alloc,
|
|
.destroy_dquot = dquot_destroy,
|
|
};
|
|
|
|
static const struct quotactl_ops ext4_qctl_operations = {
|
|
.quota_on = ext4_quota_on,
|
|
.quota_off = ext4_quota_off,
|
|
.quota_sync = dquot_quota_sync,
|
|
.get_info = dquot_get_dqinfo,
|
|
.set_info = dquot_set_dqinfo,
|
|
.get_dqblk = dquot_get_dqblk,
|
|
.set_dqblk = dquot_set_dqblk
|
|
};
|
|
#endif
|
|
|
|
static const struct super_operations ext4_sops = {
|
|
.alloc_inode = ext4_alloc_inode,
|
|
.destroy_inode = ext4_destroy_inode,
|
|
.write_inode = ext4_write_inode,
|
|
.dirty_inode = ext4_dirty_inode,
|
|
.drop_inode = ext4_drop_inode,
|
|
.evict_inode = ext4_evict_inode,
|
|
.put_super = ext4_put_super,
|
|
.sync_fs = ext4_sync_fs,
|
|
.freeze_fs = ext4_freeze,
|
|
.unfreeze_fs = ext4_unfreeze,
|
|
.statfs = ext4_statfs,
|
|
.remount_fs = ext4_remount,
|
|
.show_options = ext4_show_options,
|
|
#ifdef CONFIG_QUOTA
|
|
.quota_read = ext4_quota_read,
|
|
.quota_write = ext4_quota_write,
|
|
#endif
|
|
.bdev_try_to_free_page = bdev_try_to_free_page,
|
|
};
|
|
|
|
static const struct super_operations ext4_nojournal_sops = {
|
|
.alloc_inode = ext4_alloc_inode,
|
|
.destroy_inode = ext4_destroy_inode,
|
|
.write_inode = ext4_write_inode,
|
|
.dirty_inode = ext4_dirty_inode,
|
|
.drop_inode = ext4_drop_inode,
|
|
.evict_inode = ext4_evict_inode,
|
|
.write_super = ext4_write_super,
|
|
.put_super = ext4_put_super,
|
|
.statfs = ext4_statfs,
|
|
.remount_fs = ext4_remount,
|
|
.show_options = ext4_show_options,
|
|
#ifdef CONFIG_QUOTA
|
|
.quota_read = ext4_quota_read,
|
|
.quota_write = ext4_quota_write,
|
|
#endif
|
|
.bdev_try_to_free_page = bdev_try_to_free_page,
|
|
};
|
|
|
|
static const struct export_operations ext4_export_ops = {
|
|
.fh_to_dentry = ext4_fh_to_dentry,
|
|
.fh_to_parent = ext4_fh_to_parent,
|
|
.get_parent = ext4_get_parent,
|
|
};
|
|
|
|
enum {
|
|
Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
|
|
Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
|
|
Opt_nouid32, Opt_debug, Opt_removed,
|
|
Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
|
|
Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
|
|
Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
|
|
Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
|
|
Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
|
|
Opt_data_err_abort, Opt_data_err_ignore,
|
|
Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
|
|
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
|
|
Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
|
|
Opt_usrquota, Opt_grpquota, Opt_i_version,
|
|
Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
|
|
Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
|
|
Opt_inode_readahead_blks, Opt_journal_ioprio,
|
|
Opt_dioread_nolock, Opt_dioread_lock,
|
|
Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
|
|
};
|
|
|
|
static const match_table_t tokens = {
|
|
{Opt_bsd_df, "bsddf"},
|
|
{Opt_minix_df, "minixdf"},
|
|
{Opt_grpid, "grpid"},
|
|
{Opt_grpid, "bsdgroups"},
|
|
{Opt_nogrpid, "nogrpid"},
|
|
{Opt_nogrpid, "sysvgroups"},
|
|
{Opt_resgid, "resgid=%u"},
|
|
{Opt_resuid, "resuid=%u"},
|
|
{Opt_sb, "sb=%u"},
|
|
{Opt_err_cont, "errors=continue"},
|
|
{Opt_err_panic, "errors=panic"},
|
|
{Opt_err_ro, "errors=remount-ro"},
|
|
{Opt_nouid32, "nouid32"},
|
|
{Opt_debug, "debug"},
|
|
{Opt_removed, "oldalloc"},
|
|
{Opt_removed, "orlov"},
|
|
{Opt_user_xattr, "user_xattr"},
|
|
{Opt_nouser_xattr, "nouser_xattr"},
|
|
{Opt_acl, "acl"},
|
|
{Opt_noacl, "noacl"},
|
|
{Opt_noload, "norecovery"},
|
|
{Opt_noload, "noload"},
|
|
{Opt_removed, "nobh"},
|
|
{Opt_removed, "bh"},
|
|
{Opt_commit, "commit=%u"},
|
|
{Opt_min_batch_time, "min_batch_time=%u"},
|
|
{Opt_max_batch_time, "max_batch_time=%u"},
|
|
{Opt_journal_dev, "journal_dev=%u"},
|
|
{Opt_journal_checksum, "journal_checksum"},
|
|
{Opt_journal_async_commit, "journal_async_commit"},
|
|
{Opt_abort, "abort"},
|
|
{Opt_data_journal, "data=journal"},
|
|
{Opt_data_ordered, "data=ordered"},
|
|
{Opt_data_writeback, "data=writeback"},
|
|
{Opt_data_err_abort, "data_err=abort"},
|
|
{Opt_data_err_ignore, "data_err=ignore"},
|
|
{Opt_offusrjquota, "usrjquota="},
|
|
{Opt_usrjquota, "usrjquota=%s"},
|
|
{Opt_offgrpjquota, "grpjquota="},
|
|
{Opt_grpjquota, "grpjquota=%s"},
|
|
{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
|
|
{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
|
|
{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
|
|
{Opt_grpquota, "grpquota"},
|
|
{Opt_noquota, "noquota"},
|
|
{Opt_quota, "quota"},
|
|
{Opt_usrquota, "usrquota"},
|
|
{Opt_barrier, "barrier=%u"},
|
|
{Opt_barrier, "barrier"},
|
|
{Opt_nobarrier, "nobarrier"},
|
|
{Opt_i_version, "i_version"},
|
|
{Opt_stripe, "stripe=%u"},
|
|
{Opt_delalloc, "delalloc"},
|
|
{Opt_nodelalloc, "nodelalloc"},
|
|
{Opt_mblk_io_submit, "mblk_io_submit"},
|
|
{Opt_nomblk_io_submit, "nomblk_io_submit"},
|
|
{Opt_block_validity, "block_validity"},
|
|
{Opt_noblock_validity, "noblock_validity"},
|
|
{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
|
|
{Opt_journal_ioprio, "journal_ioprio=%u"},
|
|
{Opt_auto_da_alloc, "auto_da_alloc=%u"},
|
|
{Opt_auto_da_alloc, "auto_da_alloc"},
|
|
{Opt_noauto_da_alloc, "noauto_da_alloc"},
|
|
{Opt_dioread_nolock, "dioread_nolock"},
|
|
{Opt_dioread_lock, "dioread_lock"},
|
|
{Opt_discard, "discard"},
|
|
{Opt_nodiscard, "nodiscard"},
|
|
{Opt_init_itable, "init_itable=%u"},
|
|
{Opt_init_itable, "init_itable"},
|
|
{Opt_noinit_itable, "noinit_itable"},
|
|
{Opt_removed, "check=none"}, /* mount option from ext2/3 */
|
|
{Opt_removed, "nocheck"}, /* mount option from ext2/3 */
|
|
{Opt_removed, "reservation"}, /* mount option from ext2/3 */
|
|
{Opt_removed, "noreservation"}, /* mount option from ext2/3 */
|
|
{Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
|
|
{Opt_err, NULL},
|
|
};
|
|
|
|
static ext4_fsblk_t get_sb_block(void **data)
|
|
{
|
|
ext4_fsblk_t sb_block;
|
|
char *options = (char *) *data;
|
|
|
|
if (!options || strncmp(options, "sb=", 3) != 0)
|
|
return 1; /* Default location */
|
|
|
|
options += 3;
|
|
/* TODO: use simple_strtoll with >32bit ext4 */
|
|
sb_block = simple_strtoul(options, &options, 0);
|
|
if (*options && *options != ',') {
|
|
printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
|
|
(char *) *data);
|
|
return 1;
|
|
}
|
|
if (*options == ',')
|
|
options++;
|
|
*data = (void *) options;
|
|
|
|
return sb_block;
|
|
}
|
|
|
|
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
|
|
static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
|
|
"Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
char *qname;
|
|
|
|
if (sb_any_quota_loaded(sb) &&
|
|
!sbi->s_qf_names[qtype]) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Cannot change journaled "
|
|
"quota options when quota turned on");
|
|
return -1;
|
|
}
|
|
qname = match_strdup(args);
|
|
if (!qname) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Not enough memory for storing quotafile name");
|
|
return -1;
|
|
}
|
|
if (sbi->s_qf_names[qtype] &&
|
|
strcmp(sbi->s_qf_names[qtype], qname)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"%s quota file already specified", QTYPE2NAME(qtype));
|
|
kfree(qname);
|
|
return -1;
|
|
}
|
|
sbi->s_qf_names[qtype] = qname;
|
|
if (strchr(sbi->s_qf_names[qtype], '/')) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"quotafile must be on filesystem root");
|
|
kfree(sbi->s_qf_names[qtype]);
|
|
sbi->s_qf_names[qtype] = NULL;
|
|
return -1;
|
|
}
|
|
set_opt(sb, QUOTA);
|
|
return 1;
|
|
}
|
|
|
|
static int clear_qf_name(struct super_block *sb, int qtype)
|
|
{
|
|
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
|
|
if (sb_any_quota_loaded(sb) &&
|
|
sbi->s_qf_names[qtype]) {
|
|
ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
|
|
" when quota turned on");
|
|
return -1;
|
|
}
|
|
/*
|
|
* The space will be released later when all options are confirmed
|
|
* to be correct
|
|
*/
|
|
sbi->s_qf_names[qtype] = NULL;
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
#define MOPT_SET 0x0001
|
|
#define MOPT_CLEAR 0x0002
|
|
#define MOPT_NOSUPPORT 0x0004
|
|
#define MOPT_EXPLICIT 0x0008
|
|
#define MOPT_CLEAR_ERR 0x0010
|
|
#define MOPT_GTE0 0x0020
|
|
#ifdef CONFIG_QUOTA
|
|
#define MOPT_Q 0
|
|
#define MOPT_QFMT 0x0040
|
|
#else
|
|
#define MOPT_Q MOPT_NOSUPPORT
|
|
#define MOPT_QFMT MOPT_NOSUPPORT
|
|
#endif
|
|
#define MOPT_DATAJ 0x0080
|
|
|
|
static const struct mount_opts {
|
|
int token;
|
|
int mount_opt;
|
|
int flags;
|
|
} ext4_mount_opts[] = {
|
|
{Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
|
|
{Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
|
|
{Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
|
|
{Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
|
|
{Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
|
|
{Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
|
|
{Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
|
|
{Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
|
|
{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
|
|
{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
|
|
{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
|
|
{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
|
|
{Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
|
|
{Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
|
|
{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
|
|
{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
|
|
EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
|
|
{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
|
|
{Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
|
|
{Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
|
|
{Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
|
|
{Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
|
|
{Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
|
|
{Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
|
|
{Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
|
|
{Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
|
|
{Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
|
|
{Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
|
|
{Opt_commit, 0, MOPT_GTE0},
|
|
{Opt_max_batch_time, 0, MOPT_GTE0},
|
|
{Opt_min_batch_time, 0, MOPT_GTE0},
|
|
{Opt_inode_readahead_blks, 0, MOPT_GTE0},
|
|
{Opt_init_itable, 0, MOPT_GTE0},
|
|
{Opt_stripe, 0, MOPT_GTE0},
|
|
{Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
|
|
{Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
|
|
{Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
|
|
#ifdef CONFIG_EXT4_FS_XATTR
|
|
{Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
|
|
{Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
|
|
#else
|
|
{Opt_user_xattr, 0, MOPT_NOSUPPORT},
|
|
{Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
|
|
#endif
|
|
#ifdef CONFIG_EXT4_FS_POSIX_ACL
|
|
{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
|
|
{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
|
|
#else
|
|
{Opt_acl, 0, MOPT_NOSUPPORT},
|
|
{Opt_noacl, 0, MOPT_NOSUPPORT},
|
|
#endif
|
|
{Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
|
|
{Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
|
|
{Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
|
|
{Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
|
|
MOPT_SET | MOPT_Q},
|
|
{Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
|
|
MOPT_SET | MOPT_Q},
|
|
{Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
|
|
EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
|
|
{Opt_usrjquota, 0, MOPT_Q},
|
|
{Opt_grpjquota, 0, MOPT_Q},
|
|
{Opt_offusrjquota, 0, MOPT_Q},
|
|
{Opt_offgrpjquota, 0, MOPT_Q},
|
|
{Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
|
|
{Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
|
|
{Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
|
|
{Opt_err, 0, 0}
|
|
};
|
|
|
|
static int handle_mount_opt(struct super_block *sb, char *opt, int token,
|
|
substring_t *args, unsigned long *journal_devnum,
|
|
unsigned int *journal_ioprio, int is_remount)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
const struct mount_opts *m;
|
|
int arg = 0;
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
if (token == Opt_usrjquota)
|
|
return set_qf_name(sb, USRQUOTA, &args[0]);
|
|
else if (token == Opt_grpjquota)
|
|
return set_qf_name(sb, GRPQUOTA, &args[0]);
|
|
else if (token == Opt_offusrjquota)
|
|
return clear_qf_name(sb, USRQUOTA);
|
|
else if (token == Opt_offgrpjquota)
|
|
return clear_qf_name(sb, GRPQUOTA);
|
|
#endif
|
|
if (args->from && match_int(args, &arg))
|
|
return -1;
|
|
switch (token) {
|
|
case Opt_noacl:
|
|
case Opt_nouser_xattr:
|
|
ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
|
|
break;
|
|
case Opt_sb:
|
|
return 1; /* handled by get_sb_block() */
|
|
case Opt_removed:
|
|
ext4_msg(sb, KERN_WARNING,
|
|
"Ignoring removed %s option", opt);
|
|
return 1;
|
|
case Opt_resuid:
|
|
sbi->s_resuid = arg;
|
|
return 1;
|
|
case Opt_resgid:
|
|
sbi->s_resgid = arg;
|
|
return 1;
|
|
case Opt_abort:
|
|
sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
|
|
return 1;
|
|
case Opt_i_version:
|
|
sb->s_flags |= MS_I_VERSION;
|
|
return 1;
|
|
case Opt_journal_dev:
|
|
if (is_remount) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Cannot specify journal on remount");
|
|
return -1;
|
|
}
|
|
*journal_devnum = arg;
|
|
return 1;
|
|
case Opt_journal_ioprio:
|
|
if (arg < 0 || arg > 7)
|
|
return -1;
|
|
*journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
|
|
return 1;
|
|
}
|
|
|
|
for (m = ext4_mount_opts; m->token != Opt_err; m++) {
|
|
if (token != m->token)
|
|
continue;
|
|
if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
|
|
return -1;
|
|
if (m->flags & MOPT_EXPLICIT)
|
|
set_opt2(sb, EXPLICIT_DELALLOC);
|
|
if (m->flags & MOPT_CLEAR_ERR)
|
|
clear_opt(sb, ERRORS_MASK);
|
|
if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
|
|
ext4_msg(sb, KERN_ERR, "Cannot change quota "
|
|
"options when quota turned on");
|
|
return -1;
|
|
}
|
|
|
|
if (m->flags & MOPT_NOSUPPORT) {
|
|
ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
|
|
} else if (token == Opt_commit) {
|
|
if (arg == 0)
|
|
arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
|
|
sbi->s_commit_interval = HZ * arg;
|
|
} else if (token == Opt_max_batch_time) {
|
|
if (arg == 0)
|
|
arg = EXT4_DEF_MAX_BATCH_TIME;
|
|
sbi->s_max_batch_time = arg;
|
|
} else if (token == Opt_min_batch_time) {
|
|
sbi->s_min_batch_time = arg;
|
|
} else if (token == Opt_inode_readahead_blks) {
|
|
if (arg > (1 << 30))
|
|
return -1;
|
|
if (arg && !is_power_of_2(arg)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"EXT4-fs: inode_readahead_blks"
|
|
" must be a power of 2");
|
|
return -1;
|
|
}
|
|
sbi->s_inode_readahead_blks = arg;
|
|
} else if (token == Opt_init_itable) {
|
|
set_opt(sb, INIT_INODE_TABLE);
|
|
if (!args->from)
|
|
arg = EXT4_DEF_LI_WAIT_MULT;
|
|
sbi->s_li_wait_mult = arg;
|
|
} else if (token == Opt_stripe) {
|
|
sbi->s_stripe = arg;
|
|
} else if (m->flags & MOPT_DATAJ) {
|
|
if (is_remount) {
|
|
if (!sbi->s_journal)
|
|
ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
|
|
else if (test_opt(sb, DATA_FLAGS) !=
|
|
m->mount_opt) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Cannot change data mode on remount");
|
|
return -1;
|
|
}
|
|
} else {
|
|
clear_opt(sb, DATA_FLAGS);
|
|
sbi->s_mount_opt |= m->mount_opt;
|
|
}
|
|
#ifdef CONFIG_QUOTA
|
|
} else if (m->flags & MOPT_QFMT) {
|
|
if (sb_any_quota_loaded(sb) &&
|
|
sbi->s_jquota_fmt != m->mount_opt) {
|
|
ext4_msg(sb, KERN_ERR, "Cannot "
|
|
"change journaled quota options "
|
|
"when quota turned on");
|
|
return -1;
|
|
}
|
|
sbi->s_jquota_fmt = m->mount_opt;
|
|
#endif
|
|
} else {
|
|
if (!args->from)
|
|
arg = 1;
|
|
if (m->flags & MOPT_CLEAR)
|
|
arg = !arg;
|
|
else if (unlikely(!(m->flags & MOPT_SET))) {
|
|
ext4_msg(sb, KERN_WARNING,
|
|
"buggy handling of option %s", opt);
|
|
WARN_ON(1);
|
|
return -1;
|
|
}
|
|
if (arg != 0)
|
|
sbi->s_mount_opt |= m->mount_opt;
|
|
else
|
|
sbi->s_mount_opt &= ~m->mount_opt;
|
|
}
|
|
return 1;
|
|
}
|
|
ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
|
|
"or missing value", opt);
|
|
return -1;
|
|
}
|
|
|
|
static int parse_options(char *options, struct super_block *sb,
|
|
unsigned long *journal_devnum,
|
|
unsigned int *journal_ioprio,
|
|
int is_remount)
|
|
{
|
|
#ifdef CONFIG_QUOTA
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
#endif
|
|
char *p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int token;
|
|
|
|
if (!options)
|
|
return 1;
|
|
|
|
while ((p = strsep(&options, ",")) != NULL) {
|
|
if (!*p)
|
|
continue;
|
|
/*
|
|
* Initialize args struct so we know whether arg was
|
|
* found; some options take optional arguments.
|
|
*/
|
|
args[0].to = args[0].from = 0;
|
|
token = match_token(p, tokens, args);
|
|
if (handle_mount_opt(sb, p, token, args, journal_devnum,
|
|
journal_ioprio, is_remount) < 0)
|
|
return 0;
|
|
}
|
|
#ifdef CONFIG_QUOTA
|
|
if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
|
|
if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
|
|
clear_opt(sb, USRQUOTA);
|
|
|
|
if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
|
|
clear_opt(sb, GRPQUOTA);
|
|
|
|
if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
|
|
ext4_msg(sb, KERN_ERR, "old and new quota "
|
|
"format mixing");
|
|
return 0;
|
|
}
|
|
|
|
if (!sbi->s_jquota_fmt) {
|
|
ext4_msg(sb, KERN_ERR, "journaled quota format "
|
|
"not specified");
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (sbi->s_jquota_fmt) {
|
|
ext4_msg(sb, KERN_ERR, "journaled quota format "
|
|
"specified with no journaling "
|
|
"enabled");
|
|
return 0;
|
|
}
|
|
}
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
static inline void ext4_show_quota_options(struct seq_file *seq,
|
|
struct super_block *sb)
|
|
{
|
|
#if defined(CONFIG_QUOTA)
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
|
|
if (sbi->s_jquota_fmt) {
|
|
char *fmtname = "";
|
|
|
|
switch (sbi->s_jquota_fmt) {
|
|
case QFMT_VFS_OLD:
|
|
fmtname = "vfsold";
|
|
break;
|
|
case QFMT_VFS_V0:
|
|
fmtname = "vfsv0";
|
|
break;
|
|
case QFMT_VFS_V1:
|
|
fmtname = "vfsv1";
|
|
break;
|
|
}
|
|
seq_printf(seq, ",jqfmt=%s", fmtname);
|
|
}
|
|
|
|
if (sbi->s_qf_names[USRQUOTA])
|
|
seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
|
|
|
|
if (sbi->s_qf_names[GRPQUOTA])
|
|
seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
|
|
|
|
if (test_opt(sb, USRQUOTA))
|
|
seq_puts(seq, ",usrquota");
|
|
|
|
if (test_opt(sb, GRPQUOTA))
|
|
seq_puts(seq, ",grpquota");
|
|
#endif
|
|
}
|
|
|
|
static const char *token2str(int token)
|
|
{
|
|
static const struct match_token *t;
|
|
|
|
for (t = tokens; t->token != Opt_err; t++)
|
|
if (t->token == token && !strchr(t->pattern, '='))
|
|
break;
|
|
return t->pattern;
|
|
}
|
|
|
|
/*
|
|
* Show an option if
|
|
* - it's set to a non-default value OR
|
|
* - if the per-sb default is different from the global default
|
|
*/
|
|
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
|
|
int nodefs)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
|
|
const struct mount_opts *m;
|
|
char sep = nodefs ? '\n' : ',';
|
|
|
|
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
|
|
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
|
|
|
|
if (sbi->s_sb_block != 1)
|
|
SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
|
|
|
|
for (m = ext4_mount_opts; m->token != Opt_err; m++) {
|
|
int want_set = m->flags & MOPT_SET;
|
|
if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
|
|
(m->flags & MOPT_CLEAR_ERR))
|
|
continue;
|
|
if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
|
|
continue; /* skip if same as the default */
|
|
if ((want_set &&
|
|
(sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
|
|
(!want_set && (sbi->s_mount_opt & m->mount_opt)))
|
|
continue; /* select Opt_noFoo vs Opt_Foo */
|
|
SEQ_OPTS_PRINT("%s", token2str(m->token));
|
|
}
|
|
|
|
if (nodefs || sbi->s_resuid != EXT4_DEF_RESUID ||
|
|
le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
|
|
SEQ_OPTS_PRINT("resuid=%u", sbi->s_resuid);
|
|
if (nodefs || sbi->s_resgid != EXT4_DEF_RESGID ||
|
|
le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
|
|
SEQ_OPTS_PRINT("resgid=%u", sbi->s_resgid);
|
|
def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
|
|
if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
|
|
SEQ_OPTS_PUTS("errors=remount-ro");
|
|
if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
|
|
SEQ_OPTS_PUTS("errors=continue");
|
|
if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
|
|
SEQ_OPTS_PUTS("errors=panic");
|
|
if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
|
|
SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
|
|
if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
|
|
SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
|
|
if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
|
|
SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
|
|
if (sb->s_flags & MS_I_VERSION)
|
|
SEQ_OPTS_PUTS("i_version");
|
|
if (nodefs || sbi->s_stripe)
|
|
SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
|
|
if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
|
|
if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
|
|
SEQ_OPTS_PUTS("data=journal");
|
|
else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
|
|
SEQ_OPTS_PUTS("data=ordered");
|
|
else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
|
|
SEQ_OPTS_PUTS("data=writeback");
|
|
}
|
|
if (nodefs ||
|
|
sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
|
|
SEQ_OPTS_PRINT("inode_readahead_blks=%u",
|
|
sbi->s_inode_readahead_blks);
|
|
|
|
if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
|
|
(sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
|
|
SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
|
|
|
|
ext4_show_quota_options(seq, sb);
|
|
return 0;
|
|
}
|
|
|
|
static int ext4_show_options(struct seq_file *seq, struct dentry *root)
|
|
{
|
|
return _ext4_show_options(seq, root->d_sb, 0);
|
|
}
|
|
|
|
static int options_seq_show(struct seq_file *seq, void *offset)
|
|
{
|
|
struct super_block *sb = seq->private;
|
|
int rc;
|
|
|
|
seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
|
|
rc = _ext4_show_options(seq, sb, 1);
|
|
seq_puts(seq, "\n");
|
|
return rc;
|
|
}
|
|
|
|
static int options_open_fs(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, options_seq_show, PDE(inode)->data);
|
|
}
|
|
|
|
static const struct file_operations ext4_seq_options_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = options_open_fs,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
|
|
int read_only)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
int res = 0;
|
|
|
|
if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
|
|
ext4_msg(sb, KERN_ERR, "revision level too high, "
|
|
"forcing read-only mode");
|
|
res = MS_RDONLY;
|
|
}
|
|
if (read_only)
|
|
goto done;
|
|
if (!(sbi->s_mount_state & EXT4_VALID_FS))
|
|
ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
|
|
"running e2fsck is recommended");
|
|
else if ((sbi->s_mount_state & EXT4_ERROR_FS))
|
|
ext4_msg(sb, KERN_WARNING,
|
|
"warning: mounting fs with errors, "
|
|
"running e2fsck is recommended");
|
|
else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
|
|
le16_to_cpu(es->s_mnt_count) >=
|
|
(unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
|
|
ext4_msg(sb, KERN_WARNING,
|
|
"warning: maximal mount count reached, "
|
|
"running e2fsck is recommended");
|
|
else if (le32_to_cpu(es->s_checkinterval) &&
|
|
(le32_to_cpu(es->s_lastcheck) +
|
|
le32_to_cpu(es->s_checkinterval) <= get_seconds()))
|
|
ext4_msg(sb, KERN_WARNING,
|
|
"warning: checktime reached, "
|
|
"running e2fsck is recommended");
|
|
if (!sbi->s_journal)
|
|
es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
|
|
if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
|
|
es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
|
|
le16_add_cpu(&es->s_mnt_count, 1);
|
|
es->s_mtime = cpu_to_le32(get_seconds());
|
|
ext4_update_dynamic_rev(sb);
|
|
if (sbi->s_journal)
|
|
EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
|
|
|
ext4_commit_super(sb, 1);
|
|
done:
|
|
if (test_opt(sb, DEBUG))
|
|
printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
|
|
"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
|
|
sb->s_blocksize,
|
|
sbi->s_groups_count,
|
|
EXT4_BLOCKS_PER_GROUP(sb),
|
|
EXT4_INODES_PER_GROUP(sb),
|
|
sbi->s_mount_opt, sbi->s_mount_opt2);
|
|
|
|
cleancache_init_fs(sb);
|
|
return res;
|
|
}
|
|
|
|
static int ext4_fill_flex_info(struct super_block *sb)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_group_desc *gdp = NULL;
|
|
ext4_group_t flex_group_count;
|
|
ext4_group_t flex_group;
|
|
unsigned int groups_per_flex = 0;
|
|
size_t size;
|
|
int i;
|
|
|
|
sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
|
|
if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
|
|
sbi->s_log_groups_per_flex = 0;
|
|
return 1;
|
|
}
|
|
groups_per_flex = 1 << sbi->s_log_groups_per_flex;
|
|
|
|
/* We allocate both existing and potentially added groups */
|
|
flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
|
|
((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
|
|
EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
|
|
size = flex_group_count * sizeof(struct flex_groups);
|
|
sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
|
|
if (sbi->s_flex_groups == NULL) {
|
|
ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
|
|
flex_group_count);
|
|
goto failed;
|
|
}
|
|
|
|
for (i = 0; i < sbi->s_groups_count; i++) {
|
|
gdp = ext4_get_group_desc(sb, i, NULL);
|
|
|
|
flex_group = ext4_flex_group(sbi, i);
|
|
atomic_add(ext4_free_inodes_count(sb, gdp),
|
|
&sbi->s_flex_groups[flex_group].free_inodes);
|
|
atomic_add(ext4_free_group_clusters(sb, gdp),
|
|
&sbi->s_flex_groups[flex_group].free_clusters);
|
|
atomic_add(ext4_used_dirs_count(sb, gdp),
|
|
&sbi->s_flex_groups[flex_group].used_dirs);
|
|
}
|
|
|
|
return 1;
|
|
failed:
|
|
return 0;
|
|
}
|
|
|
|
__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
|
|
struct ext4_group_desc *gdp)
|
|
{
|
|
__u16 crc = 0;
|
|
|
|
if (sbi->s_es->s_feature_ro_compat &
|
|
cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
|
|
int offset = offsetof(struct ext4_group_desc, bg_checksum);
|
|
__le32 le_group = cpu_to_le32(block_group);
|
|
|
|
crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
|
|
crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
|
|
crc = crc16(crc, (__u8 *)gdp, offset);
|
|
offset += sizeof(gdp->bg_checksum); /* skip checksum */
|
|
/* for checksum of struct ext4_group_desc do the rest...*/
|
|
if ((sbi->s_es->s_feature_incompat &
|
|
cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
|
|
offset < le16_to_cpu(sbi->s_es->s_desc_size))
|
|
crc = crc16(crc, (__u8 *)gdp + offset,
|
|
le16_to_cpu(sbi->s_es->s_desc_size) -
|
|
offset);
|
|
}
|
|
|
|
return cpu_to_le16(crc);
|
|
}
|
|
|
|
int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
|
|
struct ext4_group_desc *gdp)
|
|
{
|
|
if ((sbi->s_es->s_feature_ro_compat &
|
|
cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
|
|
(gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Called at mount-time, super-block is locked */
|
|
static int ext4_check_descriptors(struct super_block *sb,
|
|
ext4_group_t *first_not_zeroed)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
|
|
ext4_fsblk_t last_block;
|
|
ext4_fsblk_t block_bitmap;
|
|
ext4_fsblk_t inode_bitmap;
|
|
ext4_fsblk_t inode_table;
|
|
int flexbg_flag = 0;
|
|
ext4_group_t i, grp = sbi->s_groups_count;
|
|
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
|
|
flexbg_flag = 1;
|
|
|
|
ext4_debug("Checking group descriptors");
|
|
|
|
for (i = 0; i < sbi->s_groups_count; i++) {
|
|
struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
|
|
|
|
if (i == sbi->s_groups_count - 1 || flexbg_flag)
|
|
last_block = ext4_blocks_count(sbi->s_es) - 1;
|
|
else
|
|
last_block = first_block +
|
|
(EXT4_BLOCKS_PER_GROUP(sb) - 1);
|
|
|
|
if ((grp == sbi->s_groups_count) &&
|
|
!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
|
|
grp = i;
|
|
|
|
block_bitmap = ext4_block_bitmap(sb, gdp);
|
|
if (block_bitmap < first_block || block_bitmap > last_block) {
|
|
ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
|
|
"Block bitmap for group %u not in group "
|
|
"(block %llu)!", i, block_bitmap);
|
|
return 0;
|
|
}
|
|
inode_bitmap = ext4_inode_bitmap(sb, gdp);
|
|
if (inode_bitmap < first_block || inode_bitmap > last_block) {
|
|
ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
|
|
"Inode bitmap for group %u not in group "
|
|
"(block %llu)!", i, inode_bitmap);
|
|
return 0;
|
|
}
|
|
inode_table = ext4_inode_table(sb, gdp);
|
|
if (inode_table < first_block ||
|
|
inode_table + sbi->s_itb_per_group - 1 > last_block) {
|
|
ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
|
|
"Inode table for group %u not in group "
|
|
"(block %llu)!", i, inode_table);
|
|
return 0;
|
|
}
|
|
ext4_lock_group(sb, i);
|
|
if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
|
|
ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
|
|
"Checksum for group %u failed (%u!=%u)",
|
|
i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
|
|
gdp)), le16_to_cpu(gdp->bg_checksum));
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
ext4_unlock_group(sb, i);
|
|
return 0;
|
|
}
|
|
}
|
|
ext4_unlock_group(sb, i);
|
|
if (!flexbg_flag)
|
|
first_block += EXT4_BLOCKS_PER_GROUP(sb);
|
|
}
|
|
if (NULL != first_not_zeroed)
|
|
*first_not_zeroed = grp;
|
|
|
|
ext4_free_blocks_count_set(sbi->s_es,
|
|
EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
|
|
sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
|
|
return 1;
|
|
}
|
|
|
|
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
|
|
* the superblock) which were deleted from all directories, but held open by
|
|
* a process at the time of a crash. We walk the list and try to delete these
|
|
* inodes at recovery time (only with a read-write filesystem).
|
|
*
|
|
* In order to keep the orphan inode chain consistent during traversal (in
|
|
* case of crash during recovery), we link each inode into the superblock
|
|
* orphan list_head and handle it the same way as an inode deletion during
|
|
* normal operation (which journals the operations for us).
|
|
*
|
|
* We only do an iget() and an iput() on each inode, which is very safe if we
|
|
* accidentally point at an in-use or already deleted inode. The worst that
|
|
* can happen in this case is that we get a "bit already cleared" message from
|
|
* ext4_free_inode(). The only reason we would point at a wrong inode is if
|
|
* e2fsck was run on this filesystem, and it must have already done the orphan
|
|
* inode cleanup for us, so we can safely abort without any further action.
|
|
*/
|
|
static void ext4_orphan_cleanup(struct super_block *sb,
|
|
struct ext4_super_block *es)
|
|
{
|
|
unsigned int s_flags = sb->s_flags;
|
|
int nr_orphans = 0, nr_truncates = 0;
|
|
#ifdef CONFIG_QUOTA
|
|
int i;
|
|
#endif
|
|
if (!es->s_last_orphan) {
|
|
jbd_debug(4, "no orphan inodes to clean up\n");
|
|
return;
|
|
}
|
|
|
|
if (bdev_read_only(sb->s_bdev)) {
|
|
ext4_msg(sb, KERN_ERR, "write access "
|
|
"unavailable, skipping orphan cleanup");
|
|
return;
|
|
}
|
|
|
|
/* Check if feature set would not allow a r/w mount */
|
|
if (!ext4_feature_set_ok(sb, 0)) {
|
|
ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
|
|
"unknown ROCOMPAT features");
|
|
return;
|
|
}
|
|
|
|
if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
|
|
if (es->s_last_orphan)
|
|
jbd_debug(1, "Errors on filesystem, "
|
|
"clearing orphan list.\n");
|
|
es->s_last_orphan = 0;
|
|
jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
|
|
return;
|
|
}
|
|
|
|
if (s_flags & MS_RDONLY) {
|
|
ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
|
|
sb->s_flags &= ~MS_RDONLY;
|
|
}
|
|
#ifdef CONFIG_QUOTA
|
|
/* Needed for iput() to work correctly and not trash data */
|
|
sb->s_flags |= MS_ACTIVE;
|
|
/* Turn on quotas so that they are updated correctly */
|
|
for (i = 0; i < MAXQUOTAS; i++) {
|
|
if (EXT4_SB(sb)->s_qf_names[i]) {
|
|
int ret = ext4_quota_on_mount(sb, i);
|
|
if (ret < 0)
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Cannot turn on journaled "
|
|
"quota: error %d", ret);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
while (es->s_last_orphan) {
|
|
struct inode *inode;
|
|
|
|
inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
|
|
if (IS_ERR(inode)) {
|
|
es->s_last_orphan = 0;
|
|
break;
|
|
}
|
|
|
|
list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
|
|
dquot_initialize(inode);
|
|
if (inode->i_nlink) {
|
|
ext4_msg(sb, KERN_DEBUG,
|
|
"%s: truncating inode %lu to %lld bytes",
|
|
__func__, inode->i_ino, inode->i_size);
|
|
jbd_debug(2, "truncating inode %lu to %lld bytes\n",
|
|
inode->i_ino, inode->i_size);
|
|
ext4_truncate(inode);
|
|
nr_truncates++;
|
|
} else {
|
|
ext4_msg(sb, KERN_DEBUG,
|
|
"%s: deleting unreferenced inode %lu",
|
|
__func__, inode->i_ino);
|
|
jbd_debug(2, "deleting unreferenced inode %lu\n",
|
|
inode->i_ino);
|
|
nr_orphans++;
|
|
}
|
|
iput(inode); /* The delete magic happens here! */
|
|
}
|
|
|
|
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
|
|
|
|
if (nr_orphans)
|
|
ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
|
|
PLURAL(nr_orphans));
|
|
if (nr_truncates)
|
|
ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
|
|
PLURAL(nr_truncates));
|
|
#ifdef CONFIG_QUOTA
|
|
/* Turn quotas off */
|
|
for (i = 0; i < MAXQUOTAS; i++) {
|
|
if (sb_dqopt(sb)->files[i])
|
|
dquot_quota_off(sb, i);
|
|
}
|
|
#endif
|
|
sb->s_flags = s_flags; /* Restore MS_RDONLY status */
|
|
}
|
|
|
|
/*
|
|
* Maximal extent format file size.
|
|
* Resulting logical blkno at s_maxbytes must fit in our on-disk
|
|
* extent format containers, within a sector_t, and within i_blocks
|
|
* in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
|
|
* so that won't be a limiting factor.
|
|
*
|
|
* However there is other limiting factor. We do store extents in the form
|
|
* of starting block and length, hence the resulting length of the extent
|
|
* covering maximum file size must fit into on-disk format containers as
|
|
* well. Given that length is always by 1 unit bigger than max unit (because
|
|
* we count 0 as well) we have to lower the s_maxbytes by one fs block.
|
|
*
|
|
* Note, this does *not* consider any metadata overhead for vfs i_blocks.
|
|
*/
|
|
static loff_t ext4_max_size(int blkbits, int has_huge_files)
|
|
{
|
|
loff_t res;
|
|
loff_t upper_limit = MAX_LFS_FILESIZE;
|
|
|
|
/* small i_blocks in vfs inode? */
|
|
if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
|
|
/*
|
|
* CONFIG_LBDAF is not enabled implies the inode
|
|
* i_block represent total blocks in 512 bytes
|
|
* 32 == size of vfs inode i_blocks * 8
|
|
*/
|
|
upper_limit = (1LL << 32) - 1;
|
|
|
|
/* total blocks in file system block size */
|
|
upper_limit >>= (blkbits - 9);
|
|
upper_limit <<= blkbits;
|
|
}
|
|
|
|
/*
|
|
* 32-bit extent-start container, ee_block. We lower the maxbytes
|
|
* by one fs block, so ee_len can cover the extent of maximum file
|
|
* size
|
|
*/
|
|
res = (1LL << 32) - 1;
|
|
res <<= blkbits;
|
|
|
|
/* Sanity check against vm- & vfs- imposed limits */
|
|
if (res > upper_limit)
|
|
res = upper_limit;
|
|
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
|
|
* block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
|
|
* We need to be 1 filesystem block less than the 2^48 sector limit.
|
|
*/
|
|
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
|
|
{
|
|
loff_t res = EXT4_NDIR_BLOCKS;
|
|
int meta_blocks;
|
|
loff_t upper_limit;
|
|
/* This is calculated to be the largest file size for a dense, block
|
|
* mapped file such that the file's total number of 512-byte sectors,
|
|
* including data and all indirect blocks, does not exceed (2^48 - 1).
|
|
*
|
|
* __u32 i_blocks_lo and _u16 i_blocks_high represent the total
|
|
* number of 512-byte sectors of the file.
|
|
*/
|
|
|
|
if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
|
|
/*
|
|
* !has_huge_files or CONFIG_LBDAF not enabled implies that
|
|
* the inode i_block field represents total file blocks in
|
|
* 2^32 512-byte sectors == size of vfs inode i_blocks * 8
|
|
*/
|
|
upper_limit = (1LL << 32) - 1;
|
|
|
|
/* total blocks in file system block size */
|
|
upper_limit >>= (bits - 9);
|
|
|
|
} else {
|
|
/*
|
|
* We use 48 bit ext4_inode i_blocks
|
|
* With EXT4_HUGE_FILE_FL set the i_blocks
|
|
* represent total number of blocks in
|
|
* file system block size
|
|
*/
|
|
upper_limit = (1LL << 48) - 1;
|
|
|
|
}
|
|
|
|
/* indirect blocks */
|
|
meta_blocks = 1;
|
|
/* double indirect blocks */
|
|
meta_blocks += 1 + (1LL << (bits-2));
|
|
/* tripple indirect blocks */
|
|
meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
|
|
|
|
upper_limit -= meta_blocks;
|
|
upper_limit <<= bits;
|
|
|
|
res += 1LL << (bits-2);
|
|
res += 1LL << (2*(bits-2));
|
|
res += 1LL << (3*(bits-2));
|
|
res <<= bits;
|
|
if (res > upper_limit)
|
|
res = upper_limit;
|
|
|
|
if (res > MAX_LFS_FILESIZE)
|
|
res = MAX_LFS_FILESIZE;
|
|
|
|
return res;
|
|
}
|
|
|
|
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
|
|
ext4_fsblk_t logical_sb_block, int nr)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
ext4_group_t bg, first_meta_bg;
|
|
int has_super = 0;
|
|
|
|
first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
|
|
|
|
if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
|
|
nr < first_meta_bg)
|
|
return logical_sb_block + nr + 1;
|
|
bg = sbi->s_desc_per_block * nr;
|
|
if (ext4_bg_has_super(sb, bg))
|
|
has_super = 1;
|
|
|
|
return (has_super + ext4_group_first_block_no(sb, bg));
|
|
}
|
|
|
|
/**
|
|
* ext4_get_stripe_size: Get the stripe size.
|
|
* @sbi: In memory super block info
|
|
*
|
|
* If we have specified it via mount option, then
|
|
* use the mount option value. If the value specified at mount time is
|
|
* greater than the blocks per group use the super block value.
|
|
* If the super block value is greater than blocks per group return 0.
|
|
* Allocator needs it be less than blocks per group.
|
|
*
|
|
*/
|
|
static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
|
|
{
|
|
unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
|
|
unsigned long stripe_width =
|
|
le32_to_cpu(sbi->s_es->s_raid_stripe_width);
|
|
int ret;
|
|
|
|
if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
|
|
ret = sbi->s_stripe;
|
|
else if (stripe_width <= sbi->s_blocks_per_group)
|
|
ret = stripe_width;
|
|
else if (stride <= sbi->s_blocks_per_group)
|
|
ret = stride;
|
|
else
|
|
ret = 0;
|
|
|
|
/*
|
|
* If the stripe width is 1, this makes no sense and
|
|
* we set it to 0 to turn off stripe handling code.
|
|
*/
|
|
if (ret <= 1)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* sysfs supprt */
|
|
|
|
struct ext4_attr {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
|
|
ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
|
|
const char *, size_t);
|
|
int offset;
|
|
};
|
|
|
|
static int parse_strtoul(const char *buf,
|
|
unsigned long max, unsigned long *value)
|
|
{
|
|
char *endp;
|
|
|
|
*value = simple_strtoul(skip_spaces(buf), &endp, 0);
|
|
endp = skip_spaces(endp);
|
|
if (*endp || *value > max)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
|
|
struct ext4_sb_info *sbi,
|
|
char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n",
|
|
(s64) EXT4_C2B(sbi,
|
|
percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
|
|
}
|
|
|
|
static ssize_t session_write_kbytes_show(struct ext4_attr *a,
|
|
struct ext4_sb_info *sbi, char *buf)
|
|
{
|
|
struct super_block *sb = sbi->s_buddy_cache->i_sb;
|
|
|
|
if (!sb->s_bdev->bd_part)
|
|
return snprintf(buf, PAGE_SIZE, "0\n");
|
|
return snprintf(buf, PAGE_SIZE, "%lu\n",
|
|
(part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
|
|
sbi->s_sectors_written_start) >> 1);
|
|
}
|
|
|
|
static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
|
|
struct ext4_sb_info *sbi, char *buf)
|
|
{
|
|
struct super_block *sb = sbi->s_buddy_cache->i_sb;
|
|
|
|
if (!sb->s_bdev->bd_part)
|
|
return snprintf(buf, PAGE_SIZE, "0\n");
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n",
|
|
(unsigned long long)(sbi->s_kbytes_written +
|
|
((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
|
|
EXT4_SB(sb)->s_sectors_written_start) >> 1)));
|
|
}
|
|
|
|
static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
|
|
struct ext4_sb_info *sbi,
|
|
const char *buf, size_t count)
|
|
{
|
|
unsigned long t;
|
|
|
|
if (parse_strtoul(buf, 0x40000000, &t))
|
|
return -EINVAL;
|
|
|
|
if (t && !is_power_of_2(t))
|
|
return -EINVAL;
|
|
|
|
sbi->s_inode_readahead_blks = t;
|
|
return count;
|
|
}
|
|
|
|
static ssize_t sbi_ui_show(struct ext4_attr *a,
|
|
struct ext4_sb_info *sbi, char *buf)
|
|
{
|
|
unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
|
|
}
|
|
|
|
static ssize_t sbi_ui_store(struct ext4_attr *a,
|
|
struct ext4_sb_info *sbi,
|
|
const char *buf, size_t count)
|
|
{
|
|
unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
|
|
unsigned long t;
|
|
|
|
if (parse_strtoul(buf, 0xffffffff, &t))
|
|
return -EINVAL;
|
|
*ui = t;
|
|
return count;
|
|
}
|
|
|
|
#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
|
|
static struct ext4_attr ext4_attr_##_name = { \
|
|
.attr = {.name = __stringify(_name), .mode = _mode }, \
|
|
.show = _show, \
|
|
.store = _store, \
|
|
.offset = offsetof(struct ext4_sb_info, _elname), \
|
|
}
|
|
#define EXT4_ATTR(name, mode, show, store) \
|
|
static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
|
|
|
|
#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
|
|
#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
|
|
#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
|
|
#define EXT4_RW_ATTR_SBI_UI(name, elname) \
|
|
EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
|
|
#define ATTR_LIST(name) &ext4_attr_##name.attr
|
|
|
|
EXT4_RO_ATTR(delayed_allocation_blocks);
|
|
EXT4_RO_ATTR(session_write_kbytes);
|
|
EXT4_RO_ATTR(lifetime_write_kbytes);
|
|
EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
|
|
inode_readahead_blks_store, s_inode_readahead_blks);
|
|
EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
|
|
EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
|
|
EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
|
|
EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
|
|
EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
|
|
EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
|
|
EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
|
|
EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
|
|
|
|
static struct attribute *ext4_attrs[] = {
|
|
ATTR_LIST(delayed_allocation_blocks),
|
|
ATTR_LIST(session_write_kbytes),
|
|
ATTR_LIST(lifetime_write_kbytes),
|
|
ATTR_LIST(inode_readahead_blks),
|
|
ATTR_LIST(inode_goal),
|
|
ATTR_LIST(mb_stats),
|
|
ATTR_LIST(mb_max_to_scan),
|
|
ATTR_LIST(mb_min_to_scan),
|
|
ATTR_LIST(mb_order2_req),
|
|
ATTR_LIST(mb_stream_req),
|
|
ATTR_LIST(mb_group_prealloc),
|
|
ATTR_LIST(max_writeback_mb_bump),
|
|
NULL,
|
|
};
|
|
|
|
/* Features this copy of ext4 supports */
|
|
EXT4_INFO_ATTR(lazy_itable_init);
|
|
EXT4_INFO_ATTR(batched_discard);
|
|
|
|
static struct attribute *ext4_feat_attrs[] = {
|
|
ATTR_LIST(lazy_itable_init),
|
|
ATTR_LIST(batched_discard),
|
|
NULL,
|
|
};
|
|
|
|
static ssize_t ext4_attr_show(struct kobject *kobj,
|
|
struct attribute *attr, char *buf)
|
|
{
|
|
struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
|
|
s_kobj);
|
|
struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
|
|
|
|
return a->show ? a->show(a, sbi, buf) : 0;
|
|
}
|
|
|
|
static ssize_t ext4_attr_store(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
|
|
s_kobj);
|
|
struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
|
|
|
|
return a->store ? a->store(a, sbi, buf, len) : 0;
|
|
}
|
|
|
|
static void ext4_sb_release(struct kobject *kobj)
|
|
{
|
|
struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
|
|
s_kobj);
|
|
complete(&sbi->s_kobj_unregister);
|
|
}
|
|
|
|
static const struct sysfs_ops ext4_attr_ops = {
|
|
.show = ext4_attr_show,
|
|
.store = ext4_attr_store,
|
|
};
|
|
|
|
static struct kobj_type ext4_ktype = {
|
|
.default_attrs = ext4_attrs,
|
|
.sysfs_ops = &ext4_attr_ops,
|
|
.release = ext4_sb_release,
|
|
};
|
|
|
|
static void ext4_feat_release(struct kobject *kobj)
|
|
{
|
|
complete(&ext4_feat->f_kobj_unregister);
|
|
}
|
|
|
|
static struct kobj_type ext4_feat_ktype = {
|
|
.default_attrs = ext4_feat_attrs,
|
|
.sysfs_ops = &ext4_attr_ops,
|
|
.release = ext4_feat_release,
|
|
};
|
|
|
|
/*
|
|
* Check whether this filesystem can be mounted based on
|
|
* the features present and the RDONLY/RDWR mount requested.
|
|
* Returns 1 if this filesystem can be mounted as requested,
|
|
* 0 if it cannot be.
|
|
*/
|
|
static int ext4_feature_set_ok(struct super_block *sb, int readonly)
|
|
{
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Couldn't mount because of "
|
|
"unsupported optional features (%x)",
|
|
(le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
|
|
~EXT4_FEATURE_INCOMPAT_SUPP));
|
|
return 0;
|
|
}
|
|
|
|
if (readonly)
|
|
return 1;
|
|
|
|
/* Check that feature set is OK for a read-write mount */
|
|
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
|
|
ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
|
|
"unsupported optional features (%x)",
|
|
(le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
|
|
~EXT4_FEATURE_RO_COMPAT_SUPP));
|
|
return 0;
|
|
}
|
|
/*
|
|
* Large file size enabled file system can only be mounted
|
|
* read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
|
|
*/
|
|
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
|
|
if (sizeof(blkcnt_t) < sizeof(u64)) {
|
|
ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
|
|
"cannot be mounted RDWR without "
|
|
"CONFIG_LBDAF");
|
|
return 0;
|
|
}
|
|
}
|
|
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
|
|
!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Can't support bigalloc feature without "
|
|
"extents feature\n");
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* This function is called once a day if we have errors logged
|
|
* on the file system
|
|
*/
|
|
static void print_daily_error_info(unsigned long arg)
|
|
{
|
|
struct super_block *sb = (struct super_block *) arg;
|
|
struct ext4_sb_info *sbi;
|
|
struct ext4_super_block *es;
|
|
|
|
sbi = EXT4_SB(sb);
|
|
es = sbi->s_es;
|
|
|
|
if (es->s_error_count)
|
|
ext4_msg(sb, KERN_NOTICE, "error count: %u",
|
|
le32_to_cpu(es->s_error_count));
|
|
if (es->s_first_error_time) {
|
|
printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
|
|
sb->s_id, le32_to_cpu(es->s_first_error_time),
|
|
(int) sizeof(es->s_first_error_func),
|
|
es->s_first_error_func,
|
|
le32_to_cpu(es->s_first_error_line));
|
|
if (es->s_first_error_ino)
|
|
printk(": inode %u",
|
|
le32_to_cpu(es->s_first_error_ino));
|
|
if (es->s_first_error_block)
|
|
printk(": block %llu", (unsigned long long)
|
|
le64_to_cpu(es->s_first_error_block));
|
|
printk("\n");
|
|
}
|
|
if (es->s_last_error_time) {
|
|
printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
|
|
sb->s_id, le32_to_cpu(es->s_last_error_time),
|
|
(int) sizeof(es->s_last_error_func),
|
|
es->s_last_error_func,
|
|
le32_to_cpu(es->s_last_error_line));
|
|
if (es->s_last_error_ino)
|
|
printk(": inode %u",
|
|
le32_to_cpu(es->s_last_error_ino));
|
|
if (es->s_last_error_block)
|
|
printk(": block %llu", (unsigned long long)
|
|
le64_to_cpu(es->s_last_error_block));
|
|
printk("\n");
|
|
}
|
|
mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
|
|
}
|
|
|
|
/* Find next suitable group and run ext4_init_inode_table */
|
|
static int ext4_run_li_request(struct ext4_li_request *elr)
|
|
{
|
|
struct ext4_group_desc *gdp = NULL;
|
|
ext4_group_t group, ngroups;
|
|
struct super_block *sb;
|
|
unsigned long timeout = 0;
|
|
int ret = 0;
|
|
|
|
sb = elr->lr_super;
|
|
ngroups = EXT4_SB(sb)->s_groups_count;
|
|
|
|
for (group = elr->lr_next_group; group < ngroups; group++) {
|
|
gdp = ext4_get_group_desc(sb, group, NULL);
|
|
if (!gdp) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
|
|
if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
|
|
break;
|
|
}
|
|
|
|
if (group == ngroups)
|
|
ret = 1;
|
|
|
|
if (!ret) {
|
|
timeout = jiffies;
|
|
ret = ext4_init_inode_table(sb, group,
|
|
elr->lr_timeout ? 0 : 1);
|
|
if (elr->lr_timeout == 0) {
|
|
timeout = (jiffies - timeout) *
|
|
elr->lr_sbi->s_li_wait_mult;
|
|
elr->lr_timeout = timeout;
|
|
}
|
|
elr->lr_next_sched = jiffies + elr->lr_timeout;
|
|
elr->lr_next_group = group + 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove lr_request from the list_request and free the
|
|
* request structure. Should be called with li_list_mtx held
|
|
*/
|
|
static void ext4_remove_li_request(struct ext4_li_request *elr)
|
|
{
|
|
struct ext4_sb_info *sbi;
|
|
|
|
if (!elr)
|
|
return;
|
|
|
|
sbi = elr->lr_sbi;
|
|
|
|
list_del(&elr->lr_request);
|
|
sbi->s_li_request = NULL;
|
|
kfree(elr);
|
|
}
|
|
|
|
static void ext4_unregister_li_request(struct super_block *sb)
|
|
{
|
|
mutex_lock(&ext4_li_mtx);
|
|
if (!ext4_li_info) {
|
|
mutex_unlock(&ext4_li_mtx);
|
|
return;
|
|
}
|
|
|
|
mutex_lock(&ext4_li_info->li_list_mtx);
|
|
ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
|
|
mutex_unlock(&ext4_li_info->li_list_mtx);
|
|
mutex_unlock(&ext4_li_mtx);
|
|
}
|
|
|
|
static struct task_struct *ext4_lazyinit_task;
|
|
|
|
/*
|
|
* This is the function where ext4lazyinit thread lives. It walks
|
|
* through the request list searching for next scheduled filesystem.
|
|
* When such a fs is found, run the lazy initialization request
|
|
* (ext4_rn_li_request) and keep track of the time spend in this
|
|
* function. Based on that time we compute next schedule time of
|
|
* the request. When walking through the list is complete, compute
|
|
* next waking time and put itself into sleep.
|
|
*/
|
|
static int ext4_lazyinit_thread(void *arg)
|
|
{
|
|
struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
|
|
struct list_head *pos, *n;
|
|
struct ext4_li_request *elr;
|
|
unsigned long next_wakeup, cur;
|
|
|
|
BUG_ON(NULL == eli);
|
|
|
|
cont_thread:
|
|
while (true) {
|
|
next_wakeup = MAX_JIFFY_OFFSET;
|
|
|
|
mutex_lock(&eli->li_list_mtx);
|
|
if (list_empty(&eli->li_request_list)) {
|
|
mutex_unlock(&eli->li_list_mtx);
|
|
goto exit_thread;
|
|
}
|
|
|
|
list_for_each_safe(pos, n, &eli->li_request_list) {
|
|
elr = list_entry(pos, struct ext4_li_request,
|
|
lr_request);
|
|
|
|
if (time_after_eq(jiffies, elr->lr_next_sched)) {
|
|
if (ext4_run_li_request(elr) != 0) {
|
|
/* error, remove the lazy_init job */
|
|
ext4_remove_li_request(elr);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (time_before(elr->lr_next_sched, next_wakeup))
|
|
next_wakeup = elr->lr_next_sched;
|
|
}
|
|
mutex_unlock(&eli->li_list_mtx);
|
|
|
|
try_to_freeze();
|
|
|
|
cur = jiffies;
|
|
if ((time_after_eq(cur, next_wakeup)) ||
|
|
(MAX_JIFFY_OFFSET == next_wakeup)) {
|
|
cond_resched();
|
|
continue;
|
|
}
|
|
|
|
schedule_timeout_interruptible(next_wakeup - cur);
|
|
|
|
if (kthread_should_stop()) {
|
|
ext4_clear_request_list();
|
|
goto exit_thread;
|
|
}
|
|
}
|
|
|
|
exit_thread:
|
|
/*
|
|
* It looks like the request list is empty, but we need
|
|
* to check it under the li_list_mtx lock, to prevent any
|
|
* additions into it, and of course we should lock ext4_li_mtx
|
|
* to atomically free the list and ext4_li_info, because at
|
|
* this point another ext4 filesystem could be registering
|
|
* new one.
|
|
*/
|
|
mutex_lock(&ext4_li_mtx);
|
|
mutex_lock(&eli->li_list_mtx);
|
|
if (!list_empty(&eli->li_request_list)) {
|
|
mutex_unlock(&eli->li_list_mtx);
|
|
mutex_unlock(&ext4_li_mtx);
|
|
goto cont_thread;
|
|
}
|
|
mutex_unlock(&eli->li_list_mtx);
|
|
kfree(ext4_li_info);
|
|
ext4_li_info = NULL;
|
|
mutex_unlock(&ext4_li_mtx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ext4_clear_request_list(void)
|
|
{
|
|
struct list_head *pos, *n;
|
|
struct ext4_li_request *elr;
|
|
|
|
mutex_lock(&ext4_li_info->li_list_mtx);
|
|
list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
|
|
elr = list_entry(pos, struct ext4_li_request,
|
|
lr_request);
|
|
ext4_remove_li_request(elr);
|
|
}
|
|
mutex_unlock(&ext4_li_info->li_list_mtx);
|
|
}
|
|
|
|
static int ext4_run_lazyinit_thread(void)
|
|
{
|
|
ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
|
|
ext4_li_info, "ext4lazyinit");
|
|
if (IS_ERR(ext4_lazyinit_task)) {
|
|
int err = PTR_ERR(ext4_lazyinit_task);
|
|
ext4_clear_request_list();
|
|
kfree(ext4_li_info);
|
|
ext4_li_info = NULL;
|
|
printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
|
|
"initialization thread\n",
|
|
err);
|
|
return err;
|
|
}
|
|
ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check whether it make sense to run itable init. thread or not.
|
|
* If there is at least one uninitialized inode table, return
|
|
* corresponding group number, else the loop goes through all
|
|
* groups and return total number of groups.
|
|
*/
|
|
static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
|
|
{
|
|
ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
|
|
struct ext4_group_desc *gdp = NULL;
|
|
|
|
for (group = 0; group < ngroups; group++) {
|
|
gdp = ext4_get_group_desc(sb, group, NULL);
|
|
if (!gdp)
|
|
continue;
|
|
|
|
if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
|
|
break;
|
|
}
|
|
|
|
return group;
|
|
}
|
|
|
|
static int ext4_li_info_new(void)
|
|
{
|
|
struct ext4_lazy_init *eli = NULL;
|
|
|
|
eli = kzalloc(sizeof(*eli), GFP_KERNEL);
|
|
if (!eli)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&eli->li_request_list);
|
|
mutex_init(&eli->li_list_mtx);
|
|
|
|
eli->li_state |= EXT4_LAZYINIT_QUIT;
|
|
|
|
ext4_li_info = eli;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
|
|
ext4_group_t start)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_li_request *elr;
|
|
unsigned long rnd;
|
|
|
|
elr = kzalloc(sizeof(*elr), GFP_KERNEL);
|
|
if (!elr)
|
|
return NULL;
|
|
|
|
elr->lr_super = sb;
|
|
elr->lr_sbi = sbi;
|
|
elr->lr_next_group = start;
|
|
|
|
/*
|
|
* Randomize first schedule time of the request to
|
|
* spread the inode table initialization requests
|
|
* better.
|
|
*/
|
|
get_random_bytes(&rnd, sizeof(rnd));
|
|
elr->lr_next_sched = jiffies + (unsigned long)rnd %
|
|
(EXT4_DEF_LI_MAX_START_DELAY * HZ);
|
|
|
|
return elr;
|
|
}
|
|
|
|
static int ext4_register_li_request(struct super_block *sb,
|
|
ext4_group_t first_not_zeroed)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_li_request *elr;
|
|
ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
|
|
int ret = 0;
|
|
|
|
if (sbi->s_li_request != NULL) {
|
|
/*
|
|
* Reset timeout so it can be computed again, because
|
|
* s_li_wait_mult might have changed.
|
|
*/
|
|
sbi->s_li_request->lr_timeout = 0;
|
|
return 0;
|
|
}
|
|
|
|
if (first_not_zeroed == ngroups ||
|
|
(sb->s_flags & MS_RDONLY) ||
|
|
!test_opt(sb, INIT_INODE_TABLE))
|
|
return 0;
|
|
|
|
elr = ext4_li_request_new(sb, first_not_zeroed);
|
|
if (!elr)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&ext4_li_mtx);
|
|
|
|
if (NULL == ext4_li_info) {
|
|
ret = ext4_li_info_new();
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&ext4_li_info->li_list_mtx);
|
|
list_add(&elr->lr_request, &ext4_li_info->li_request_list);
|
|
mutex_unlock(&ext4_li_info->li_list_mtx);
|
|
|
|
sbi->s_li_request = elr;
|
|
/*
|
|
* set elr to NULL here since it has been inserted to
|
|
* the request_list and the removal and free of it is
|
|
* handled by ext4_clear_request_list from now on.
|
|
*/
|
|
elr = NULL;
|
|
|
|
if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
|
|
ret = ext4_run_lazyinit_thread();
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
out:
|
|
mutex_unlock(&ext4_li_mtx);
|
|
if (ret)
|
|
kfree(elr);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* We do not need to lock anything since this is called on
|
|
* module unload.
|
|
*/
|
|
static void ext4_destroy_lazyinit_thread(void)
|
|
{
|
|
/*
|
|
* If thread exited earlier
|
|
* there's nothing to be done.
|
|
*/
|
|
if (!ext4_li_info || !ext4_lazyinit_task)
|
|
return;
|
|
|
|
kthread_stop(ext4_lazyinit_task);
|
|
}
|
|
|
|
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
char *orig_data = kstrdup(data, GFP_KERNEL);
|
|
struct buffer_head *bh;
|
|
struct ext4_super_block *es = NULL;
|
|
struct ext4_sb_info *sbi;
|
|
ext4_fsblk_t block;
|
|
ext4_fsblk_t sb_block = get_sb_block(&data);
|
|
ext4_fsblk_t logical_sb_block;
|
|
unsigned long offset = 0;
|
|
unsigned long journal_devnum = 0;
|
|
unsigned long def_mount_opts;
|
|
struct inode *root;
|
|
char *cp;
|
|
const char *descr;
|
|
int ret = -ENOMEM;
|
|
int blocksize, clustersize;
|
|
unsigned int db_count;
|
|
unsigned int i;
|
|
int needs_recovery, has_huge_files, has_bigalloc;
|
|
__u64 blocks_count;
|
|
int err;
|
|
unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
|
|
ext4_group_t first_not_zeroed;
|
|
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
|
if (!sbi)
|
|
goto out_free_orig;
|
|
|
|
sbi->s_blockgroup_lock =
|
|
kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
|
|
if (!sbi->s_blockgroup_lock) {
|
|
kfree(sbi);
|
|
goto out_free_orig;
|
|
}
|
|
sb->s_fs_info = sbi;
|
|
sbi->s_mount_opt = 0;
|
|
sbi->s_resuid = EXT4_DEF_RESUID;
|
|
sbi->s_resgid = EXT4_DEF_RESGID;
|
|
sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
|
|
sbi->s_sb_block = sb_block;
|
|
if (sb->s_bdev->bd_part)
|
|
sbi->s_sectors_written_start =
|
|
part_stat_read(sb->s_bdev->bd_part, sectors[1]);
|
|
|
|
/* Cleanup superblock name */
|
|
for (cp = sb->s_id; (cp = strchr(cp, '/'));)
|
|
*cp = '!';
|
|
|
|
ret = -EINVAL;
|
|
blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
|
|
if (!blocksize) {
|
|
ext4_msg(sb, KERN_ERR, "unable to set blocksize");
|
|
goto out_fail;
|
|
}
|
|
|
|
/*
|
|
* The ext4 superblock will not be buffer aligned for other than 1kB
|
|
* block sizes. We need to calculate the offset from buffer start.
|
|
*/
|
|
if (blocksize != EXT4_MIN_BLOCK_SIZE) {
|
|
logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
|
|
offset = do_div(logical_sb_block, blocksize);
|
|
} else {
|
|
logical_sb_block = sb_block;
|
|
}
|
|
|
|
if (!(bh = sb_bread(sb, logical_sb_block))) {
|
|
ext4_msg(sb, KERN_ERR, "unable to read superblock");
|
|
goto out_fail;
|
|
}
|
|
/*
|
|
* Note: s_es must be initialized as soon as possible because
|
|
* some ext4 macro-instructions depend on its value
|
|
*/
|
|
es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
|
|
sbi->s_es = es;
|
|
sb->s_magic = le16_to_cpu(es->s_magic);
|
|
if (sb->s_magic != EXT4_SUPER_MAGIC)
|
|
goto cantfind_ext4;
|
|
sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
|
|
|
|
/* Set defaults before we parse the mount options */
|
|
def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
|
|
set_opt(sb, INIT_INODE_TABLE);
|
|
if (def_mount_opts & EXT4_DEFM_DEBUG)
|
|
set_opt(sb, DEBUG);
|
|
if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
|
|
set_opt(sb, GRPID);
|
|
if (def_mount_opts & EXT4_DEFM_UID16)
|
|
set_opt(sb, NO_UID32);
|
|
/* xattr user namespace & acls are now defaulted on */
|
|
#ifdef CONFIG_EXT4_FS_XATTR
|
|
set_opt(sb, XATTR_USER);
|
|
#endif
|
|
#ifdef CONFIG_EXT4_FS_POSIX_ACL
|
|
set_opt(sb, POSIX_ACL);
|
|
#endif
|
|
set_opt(sb, MBLK_IO_SUBMIT);
|
|
if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
|
|
set_opt(sb, JOURNAL_DATA);
|
|
else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
|
|
set_opt(sb, ORDERED_DATA);
|
|
else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
|
|
set_opt(sb, WRITEBACK_DATA);
|
|
|
|
if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
|
|
set_opt(sb, ERRORS_PANIC);
|
|
else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
|
|
set_opt(sb, ERRORS_CONT);
|
|
else
|
|
set_opt(sb, ERRORS_RO);
|
|
if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
|
|
set_opt(sb, BLOCK_VALIDITY);
|
|
if (def_mount_opts & EXT4_DEFM_DISCARD)
|
|
set_opt(sb, DISCARD);
|
|
|
|
sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
|
|
sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
|
|
sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
|
|
sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
|
|
sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
|
|
|
|
if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
|
|
set_opt(sb, BARRIER);
|
|
|
|
/*
|
|
* enable delayed allocation by default
|
|
* Use -o nodelalloc to turn it off
|
|
*/
|
|
if (!IS_EXT3_SB(sb) &&
|
|
((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
|
|
set_opt(sb, DELALLOC);
|
|
|
|
/*
|
|
* set default s_li_wait_mult for lazyinit, for the case there is
|
|
* no mount option specified.
|
|
*/
|
|
sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
|
|
|
|
if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
|
|
&journal_devnum, &journal_ioprio, 0)) {
|
|
ext4_msg(sb, KERN_WARNING,
|
|
"failed to parse options in superblock: %s",
|
|
sbi->s_es->s_mount_opts);
|
|
}
|
|
sbi->s_def_mount_opt = sbi->s_mount_opt;
|
|
if (!parse_options((char *) data, sb, &journal_devnum,
|
|
&journal_ioprio, 0))
|
|
goto failed_mount;
|
|
|
|
if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
|
|
printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
|
|
"with data=journal disables delayed "
|
|
"allocation and O_DIRECT support!\n");
|
|
if (test_opt2(sb, EXPLICIT_DELALLOC)) {
|
|
ext4_msg(sb, KERN_ERR, "can't mount with "
|
|
"both data=journal and delalloc");
|
|
goto failed_mount;
|
|
}
|
|
if (test_opt(sb, DIOREAD_NOLOCK)) {
|
|
ext4_msg(sb, KERN_ERR, "can't mount with "
|
|
"both data=journal and delalloc");
|
|
goto failed_mount;
|
|
}
|
|
if (test_opt(sb, DELALLOC))
|
|
clear_opt(sb, DELALLOC);
|
|
}
|
|
|
|
blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
|
|
if (test_opt(sb, DIOREAD_NOLOCK)) {
|
|
if (blocksize < PAGE_SIZE) {
|
|
ext4_msg(sb, KERN_ERR, "can't mount with "
|
|
"dioread_nolock if block size != PAGE_SIZE");
|
|
goto failed_mount;
|
|
}
|
|
}
|
|
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
|
(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
|
|
|
|
if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
|
|
(EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
|
|
EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
|
|
EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
|
|
ext4_msg(sb, KERN_WARNING,
|
|
"feature flags set on rev 0 fs, "
|
|
"running e2fsck is recommended");
|
|
|
|
if (IS_EXT2_SB(sb)) {
|
|
if (ext2_feature_set_ok(sb))
|
|
ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
|
|
"using the ext4 subsystem");
|
|
else {
|
|
ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
|
|
"to feature incompatibilities");
|
|
goto failed_mount;
|
|
}
|
|
}
|
|
|
|
if (IS_EXT3_SB(sb)) {
|
|
if (ext3_feature_set_ok(sb))
|
|
ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
|
|
"using the ext4 subsystem");
|
|
else {
|
|
ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
|
|
"to feature incompatibilities");
|
|
goto failed_mount;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check feature flags regardless of the revision level, since we
|
|
* previously didn't change the revision level when setting the flags,
|
|
* so there is a chance incompat flags are set on a rev 0 filesystem.
|
|
*/
|
|
if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
|
|
goto failed_mount;
|
|
|
|
if (blocksize < EXT4_MIN_BLOCK_SIZE ||
|
|
blocksize > EXT4_MAX_BLOCK_SIZE) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Unsupported filesystem blocksize %d", blocksize);
|
|
goto failed_mount;
|
|
}
|
|
|
|
if (sb->s_blocksize != blocksize) {
|
|
/* Validate the filesystem blocksize */
|
|
if (!sb_set_blocksize(sb, blocksize)) {
|
|
ext4_msg(sb, KERN_ERR, "bad block size %d",
|
|
blocksize);
|
|
goto failed_mount;
|
|
}
|
|
|
|
brelse(bh);
|
|
logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
|
|
offset = do_div(logical_sb_block, blocksize);
|
|
bh = sb_bread(sb, logical_sb_block);
|
|
if (!bh) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Can't read superblock on 2nd try");
|
|
goto failed_mount;
|
|
}
|
|
es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
|
|
sbi->s_es = es;
|
|
if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Magic mismatch, very weird!");
|
|
goto failed_mount;
|
|
}
|
|
}
|
|
|
|
has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
|
|
EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
|
|
sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
|
|
has_huge_files);
|
|
sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
|
|
|
|
if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
|
|
sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
|
|
sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
|
|
} else {
|
|
sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
|
|
sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
|
|
if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
|
|
(!is_power_of_2(sbi->s_inode_size)) ||
|
|
(sbi->s_inode_size > blocksize)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"unsupported inode size: %d",
|
|
sbi->s_inode_size);
|
|
goto failed_mount;
|
|
}
|
|
if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
|
|
sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
|
|
}
|
|
|
|
sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
|
|
if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
|
|
sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
|
|
!is_power_of_2(sbi->s_desc_size)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"unsupported descriptor size %lu",
|
|
sbi->s_desc_size);
|
|
goto failed_mount;
|
|
}
|
|
} else
|
|
sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
|
|
|
|
sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
|
|
sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
|
|
if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
|
|
goto cantfind_ext4;
|
|
|
|
sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
|
|
if (sbi->s_inodes_per_block == 0)
|
|
goto cantfind_ext4;
|
|
sbi->s_itb_per_group = sbi->s_inodes_per_group /
|
|
sbi->s_inodes_per_block;
|
|
sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
|
|
sbi->s_sbh = bh;
|
|
sbi->s_mount_state = le16_to_cpu(es->s_state);
|
|
sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
|
|
sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
|
|
|
|
for (i = 0; i < 4; i++)
|
|
sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
|
|
sbi->s_def_hash_version = es->s_def_hash_version;
|
|
i = le32_to_cpu(es->s_flags);
|
|
if (i & EXT2_FLAGS_UNSIGNED_HASH)
|
|
sbi->s_hash_unsigned = 3;
|
|
else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
|
|
#ifdef __CHAR_UNSIGNED__
|
|
es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
|
|
sbi->s_hash_unsigned = 3;
|
|
#else
|
|
es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
|
|
#endif
|
|
}
|
|
|
|
/* Handle clustersize */
|
|
clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
|
|
has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
|
|
EXT4_FEATURE_RO_COMPAT_BIGALLOC);
|
|
if (has_bigalloc) {
|
|
if (clustersize < blocksize) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"cluster size (%d) smaller than "
|
|
"block size (%d)", clustersize, blocksize);
|
|
goto failed_mount;
|
|
}
|
|
sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
|
|
le32_to_cpu(es->s_log_block_size);
|
|
sbi->s_clusters_per_group =
|
|
le32_to_cpu(es->s_clusters_per_group);
|
|
if (sbi->s_clusters_per_group > blocksize * 8) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"#clusters per group too big: %lu",
|
|
sbi->s_clusters_per_group);
|
|
goto failed_mount;
|
|
}
|
|
if (sbi->s_blocks_per_group !=
|
|
(sbi->s_clusters_per_group * (clustersize / blocksize))) {
|
|
ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
|
|
"clusters per group (%lu) inconsistent",
|
|
sbi->s_blocks_per_group,
|
|
sbi->s_clusters_per_group);
|
|
goto failed_mount;
|
|
}
|
|
} else {
|
|
if (clustersize != blocksize) {
|
|
ext4_warning(sb, "fragment/cluster size (%d) != "
|
|
"block size (%d)", clustersize,
|
|
blocksize);
|
|
clustersize = blocksize;
|
|
}
|
|
if (sbi->s_blocks_per_group > blocksize * 8) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"#blocks per group too big: %lu",
|
|
sbi->s_blocks_per_group);
|
|
goto failed_mount;
|
|
}
|
|
sbi->s_clusters_per_group = sbi->s_blocks_per_group;
|
|
sbi->s_cluster_bits = 0;
|
|
}
|
|
sbi->s_cluster_ratio = clustersize / blocksize;
|
|
|
|
if (sbi->s_inodes_per_group > blocksize * 8) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"#inodes per group too big: %lu",
|
|
sbi->s_inodes_per_group);
|
|
goto failed_mount;
|
|
}
|
|
|
|
/*
|
|
* Test whether we have more sectors than will fit in sector_t,
|
|
* and whether the max offset is addressable by the page cache.
|
|
*/
|
|
err = generic_check_addressable(sb->s_blocksize_bits,
|
|
ext4_blocks_count(es));
|
|
if (err) {
|
|
ext4_msg(sb, KERN_ERR, "filesystem"
|
|
" too large to mount safely on this system");
|
|
if (sizeof(sector_t) < 8)
|
|
ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
|
|
ret = err;
|
|
goto failed_mount;
|
|
}
|
|
|
|
if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
|
|
goto cantfind_ext4;
|
|
|
|
/* check blocks count against device size */
|
|
blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
|
|
if (blocks_count && ext4_blocks_count(es) > blocks_count) {
|
|
ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
|
|
"exceeds size of device (%llu blocks)",
|
|
ext4_blocks_count(es), blocks_count);
|
|
goto failed_mount;
|
|
}
|
|
|
|
/*
|
|
* It makes no sense for the first data block to be beyond the end
|
|
* of the filesystem.
|
|
*/
|
|
if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
|
|
ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
|
|
"block %u is beyond end of filesystem (%llu)",
|
|
le32_to_cpu(es->s_first_data_block),
|
|
ext4_blocks_count(es));
|
|
goto failed_mount;
|
|
}
|
|
blocks_count = (ext4_blocks_count(es) -
|
|
le32_to_cpu(es->s_first_data_block) +
|
|
EXT4_BLOCKS_PER_GROUP(sb) - 1);
|
|
do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
|
|
if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
|
|
ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
|
|
"(block count %llu, first data block %u, "
|
|
"blocks per group %lu)", sbi->s_groups_count,
|
|
ext4_blocks_count(es),
|
|
le32_to_cpu(es->s_first_data_block),
|
|
EXT4_BLOCKS_PER_GROUP(sb));
|
|
goto failed_mount;
|
|
}
|
|
sbi->s_groups_count = blocks_count;
|
|
sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
|
|
(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
|
|
db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
|
|
EXT4_DESC_PER_BLOCK(sb);
|
|
sbi->s_group_desc = ext4_kvmalloc(db_count *
|
|
sizeof(struct buffer_head *),
|
|
GFP_KERNEL);
|
|
if (sbi->s_group_desc == NULL) {
|
|
ext4_msg(sb, KERN_ERR, "not enough memory");
|
|
goto failed_mount;
|
|
}
|
|
|
|
if (ext4_proc_root)
|
|
sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
|
|
|
|
if (sbi->s_proc)
|
|
proc_create_data("options", S_IRUGO, sbi->s_proc,
|
|
&ext4_seq_options_fops, sb);
|
|
|
|
bgl_lock_init(sbi->s_blockgroup_lock);
|
|
|
|
for (i = 0; i < db_count; i++) {
|
|
block = descriptor_loc(sb, logical_sb_block, i);
|
|
sbi->s_group_desc[i] = sb_bread(sb, block);
|
|
if (!sbi->s_group_desc[i]) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"can't read group descriptor %d", i);
|
|
db_count = i;
|
|
goto failed_mount2;
|
|
}
|
|
}
|
|
if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
|
|
ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
|
|
goto failed_mount2;
|
|
}
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
|
|
if (!ext4_fill_flex_info(sb)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"unable to initialize "
|
|
"flex_bg meta info!");
|
|
goto failed_mount2;
|
|
}
|
|
|
|
sbi->s_gdb_count = db_count;
|
|
get_random_bytes(&sbi->s_next_generation, sizeof(u32));
|
|
spin_lock_init(&sbi->s_next_gen_lock);
|
|
|
|
init_timer(&sbi->s_err_report);
|
|
sbi->s_err_report.function = print_daily_error_info;
|
|
sbi->s_err_report.data = (unsigned long) sb;
|
|
|
|
err = percpu_counter_init(&sbi->s_freeclusters_counter,
|
|
ext4_count_free_clusters(sb));
|
|
if (!err) {
|
|
err = percpu_counter_init(&sbi->s_freeinodes_counter,
|
|
ext4_count_free_inodes(sb));
|
|
}
|
|
if (!err) {
|
|
err = percpu_counter_init(&sbi->s_dirs_counter,
|
|
ext4_count_dirs(sb));
|
|
}
|
|
if (!err) {
|
|
err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
|
|
}
|
|
if (err) {
|
|
ext4_msg(sb, KERN_ERR, "insufficient memory");
|
|
goto failed_mount3;
|
|
}
|
|
|
|
sbi->s_stripe = ext4_get_stripe_size(sbi);
|
|
sbi->s_max_writeback_mb_bump = 128;
|
|
|
|
/*
|
|
* set up enough so that it can read an inode
|
|
*/
|
|
if (!test_opt(sb, NOLOAD) &&
|
|
EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
|
|
sb->s_op = &ext4_sops;
|
|
else
|
|
sb->s_op = &ext4_nojournal_sops;
|
|
sb->s_export_op = &ext4_export_ops;
|
|
sb->s_xattr = ext4_xattr_handlers;
|
|
#ifdef CONFIG_QUOTA
|
|
sb->s_qcop = &ext4_qctl_operations;
|
|
sb->dq_op = &ext4_quota_operations;
|
|
#endif
|
|
memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
|
|
|
|
INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
|
|
mutex_init(&sbi->s_orphan_lock);
|
|
sbi->s_resize_flags = 0;
|
|
|
|
sb->s_root = NULL;
|
|
|
|
needs_recovery = (es->s_last_orphan != 0 ||
|
|
EXT4_HAS_INCOMPAT_FEATURE(sb,
|
|
EXT4_FEATURE_INCOMPAT_RECOVER));
|
|
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
|
|
!(sb->s_flags & MS_RDONLY))
|
|
if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
|
|
goto failed_mount3;
|
|
|
|
/*
|
|
* The first inode we look at is the journal inode. Don't try
|
|
* root first: it may be modified in the journal!
|
|
*/
|
|
if (!test_opt(sb, NOLOAD) &&
|
|
EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
|
|
if (ext4_load_journal(sb, es, journal_devnum))
|
|
goto failed_mount3;
|
|
} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
|
|
EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
|
|
ext4_msg(sb, KERN_ERR, "required journal recovery "
|
|
"suppressed and not mounted read-only");
|
|
goto failed_mount_wq;
|
|
} else {
|
|
clear_opt(sb, DATA_FLAGS);
|
|
sbi->s_journal = NULL;
|
|
needs_recovery = 0;
|
|
goto no_journal;
|
|
}
|
|
|
|
if (ext4_blocks_count(es) > 0xffffffffULL &&
|
|
!jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
|
|
JBD2_FEATURE_INCOMPAT_64BIT)) {
|
|
ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
|
|
goto failed_mount_wq;
|
|
}
|
|
|
|
if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
|
|
jbd2_journal_set_features(sbi->s_journal,
|
|
JBD2_FEATURE_COMPAT_CHECKSUM, 0,
|
|
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
|
|
} else if (test_opt(sb, JOURNAL_CHECKSUM)) {
|
|
jbd2_journal_set_features(sbi->s_journal,
|
|
JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
|
|
jbd2_journal_clear_features(sbi->s_journal, 0, 0,
|
|
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
|
|
} else {
|
|
jbd2_journal_clear_features(sbi->s_journal,
|
|
JBD2_FEATURE_COMPAT_CHECKSUM, 0,
|
|
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
|
|
}
|
|
|
|
/* We have now updated the journal if required, so we can
|
|
* validate the data journaling mode. */
|
|
switch (test_opt(sb, DATA_FLAGS)) {
|
|
case 0:
|
|
/* No mode set, assume a default based on the journal
|
|
* capabilities: ORDERED_DATA if the journal can
|
|
* cope, else JOURNAL_DATA
|
|
*/
|
|
if (jbd2_journal_check_available_features
|
|
(sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
|
|
set_opt(sb, ORDERED_DATA);
|
|
else
|
|
set_opt(sb, JOURNAL_DATA);
|
|
break;
|
|
|
|
case EXT4_MOUNT_ORDERED_DATA:
|
|
case EXT4_MOUNT_WRITEBACK_DATA:
|
|
if (!jbd2_journal_check_available_features
|
|
(sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
|
|
ext4_msg(sb, KERN_ERR, "Journal does not support "
|
|
"requested data journaling mode");
|
|
goto failed_mount_wq;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
|
|
|
|
sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
|
|
|
|
/*
|
|
* The journal may have updated the bg summary counts, so we
|
|
* need to update the global counters.
|
|
*/
|
|
percpu_counter_set(&sbi->s_freeclusters_counter,
|
|
ext4_count_free_clusters(sb));
|
|
percpu_counter_set(&sbi->s_freeinodes_counter,
|
|
ext4_count_free_inodes(sb));
|
|
percpu_counter_set(&sbi->s_dirs_counter,
|
|
ext4_count_dirs(sb));
|
|
percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
|
|
|
|
no_journal:
|
|
/*
|
|
* The maximum number of concurrent works can be high and
|
|
* concurrency isn't really necessary. Limit it to 1.
|
|
*/
|
|
EXT4_SB(sb)->dio_unwritten_wq =
|
|
alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
|
|
if (!EXT4_SB(sb)->dio_unwritten_wq) {
|
|
printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
|
|
goto failed_mount_wq;
|
|
}
|
|
|
|
/*
|
|
* The jbd2_journal_load will have done any necessary log recovery,
|
|
* so we can safely mount the rest of the filesystem now.
|
|
*/
|
|
|
|
root = ext4_iget(sb, EXT4_ROOT_INO);
|
|
if (IS_ERR(root)) {
|
|
ext4_msg(sb, KERN_ERR, "get root inode failed");
|
|
ret = PTR_ERR(root);
|
|
root = NULL;
|
|
goto failed_mount4;
|
|
}
|
|
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
|
|
ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
|
|
iput(root);
|
|
goto failed_mount4;
|
|
}
|
|
sb->s_root = d_make_root(root);
|
|
if (!sb->s_root) {
|
|
ext4_msg(sb, KERN_ERR, "get root dentry failed");
|
|
ret = -ENOMEM;
|
|
goto failed_mount4;
|
|
}
|
|
|
|
ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
|
|
|
|
/* determine the minimum size of new large inodes, if present */
|
|
if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
|
|
sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
|
|
EXT4_GOOD_OLD_INODE_SIZE;
|
|
if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
|
|
EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
|
|
if (sbi->s_want_extra_isize <
|
|
le16_to_cpu(es->s_want_extra_isize))
|
|
sbi->s_want_extra_isize =
|
|
le16_to_cpu(es->s_want_extra_isize);
|
|
if (sbi->s_want_extra_isize <
|
|
le16_to_cpu(es->s_min_extra_isize))
|
|
sbi->s_want_extra_isize =
|
|
le16_to_cpu(es->s_min_extra_isize);
|
|
}
|
|
}
|
|
/* Check if enough inode space is available */
|
|
if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
|
|
sbi->s_inode_size) {
|
|
sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
|
|
EXT4_GOOD_OLD_INODE_SIZE;
|
|
ext4_msg(sb, KERN_INFO, "required extra inode space not"
|
|
"available");
|
|
}
|
|
|
|
err = ext4_setup_system_zone(sb);
|
|
if (err) {
|
|
ext4_msg(sb, KERN_ERR, "failed to initialize system "
|
|
"zone (%d)", err);
|
|
goto failed_mount4a;
|
|
}
|
|
|
|
ext4_ext_init(sb);
|
|
err = ext4_mb_init(sb, needs_recovery);
|
|
if (err) {
|
|
ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
|
|
err);
|
|
goto failed_mount5;
|
|
}
|
|
|
|
err = ext4_register_li_request(sb, first_not_zeroed);
|
|
if (err)
|
|
goto failed_mount6;
|
|
|
|
sbi->s_kobj.kset = ext4_kset;
|
|
init_completion(&sbi->s_kobj_unregister);
|
|
err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
|
|
"%s", sb->s_id);
|
|
if (err)
|
|
goto failed_mount7;
|
|
|
|
EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
|
|
ext4_orphan_cleanup(sb, es);
|
|
EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
|
|
if (needs_recovery) {
|
|
ext4_msg(sb, KERN_INFO, "recovery complete");
|
|
ext4_mark_recovery_complete(sb, es);
|
|
}
|
|
if (EXT4_SB(sb)->s_journal) {
|
|
if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
|
|
descr = " journalled data mode";
|
|
else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
|
|
descr = " ordered data mode";
|
|
else
|
|
descr = " writeback data mode";
|
|
} else
|
|
descr = "out journal";
|
|
|
|
ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
|
|
"Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
|
|
*sbi->s_es->s_mount_opts ? "; " : "", orig_data);
|
|
|
|
if (es->s_error_count)
|
|
mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
|
|
|
|
kfree(orig_data);
|
|
return 0;
|
|
|
|
cantfind_ext4:
|
|
if (!silent)
|
|
ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
|
|
goto failed_mount;
|
|
|
|
failed_mount7:
|
|
ext4_unregister_li_request(sb);
|
|
failed_mount6:
|
|
ext4_mb_release(sb);
|
|
failed_mount5:
|
|
ext4_ext_release(sb);
|
|
ext4_release_system_zone(sb);
|
|
failed_mount4a:
|
|
dput(sb->s_root);
|
|
sb->s_root = NULL;
|
|
failed_mount4:
|
|
ext4_msg(sb, KERN_ERR, "mount failed");
|
|
destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
|
|
failed_mount_wq:
|
|
if (sbi->s_journal) {
|
|
jbd2_journal_destroy(sbi->s_journal);
|
|
sbi->s_journal = NULL;
|
|
}
|
|
failed_mount3:
|
|
del_timer(&sbi->s_err_report);
|
|
if (sbi->s_flex_groups)
|
|
ext4_kvfree(sbi->s_flex_groups);
|
|
percpu_counter_destroy(&sbi->s_freeclusters_counter);
|
|
percpu_counter_destroy(&sbi->s_freeinodes_counter);
|
|
percpu_counter_destroy(&sbi->s_dirs_counter);
|
|
percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
|
|
if (sbi->s_mmp_tsk)
|
|
kthread_stop(sbi->s_mmp_tsk);
|
|
failed_mount2:
|
|
for (i = 0; i < db_count; i++)
|
|
brelse(sbi->s_group_desc[i]);
|
|
ext4_kvfree(sbi->s_group_desc);
|
|
failed_mount:
|
|
if (sbi->s_proc) {
|
|
remove_proc_entry("options", sbi->s_proc);
|
|
remove_proc_entry(sb->s_id, ext4_proc_root);
|
|
}
|
|
#ifdef CONFIG_QUOTA
|
|
for (i = 0; i < MAXQUOTAS; i++)
|
|
kfree(sbi->s_qf_names[i]);
|
|
#endif
|
|
ext4_blkdev_remove(sbi);
|
|
brelse(bh);
|
|
out_fail:
|
|
sb->s_fs_info = NULL;
|
|
kfree(sbi->s_blockgroup_lock);
|
|
kfree(sbi);
|
|
out_free_orig:
|
|
kfree(orig_data);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Setup any per-fs journal parameters now. We'll do this both on
|
|
* initial mount, once the journal has been initialised but before we've
|
|
* done any recovery; and again on any subsequent remount.
|
|
*/
|
|
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
|
|
journal->j_commit_interval = sbi->s_commit_interval;
|
|
journal->j_min_batch_time = sbi->s_min_batch_time;
|
|
journal->j_max_batch_time = sbi->s_max_batch_time;
|
|
|
|
write_lock(&journal->j_state_lock);
|
|
if (test_opt(sb, BARRIER))
|
|
journal->j_flags |= JBD2_BARRIER;
|
|
else
|
|
journal->j_flags &= ~JBD2_BARRIER;
|
|
if (test_opt(sb, DATA_ERR_ABORT))
|
|
journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
|
|
else
|
|
journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
|
|
write_unlock(&journal->j_state_lock);
|
|
}
|
|
|
|
static journal_t *ext4_get_journal(struct super_block *sb,
|
|
unsigned int journal_inum)
|
|
{
|
|
struct inode *journal_inode;
|
|
journal_t *journal;
|
|
|
|
BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
|
|
|
|
/* First, test for the existence of a valid inode on disk. Bad
|
|
* things happen if we iget() an unused inode, as the subsequent
|
|
* iput() will try to delete it. */
|
|
|
|
journal_inode = ext4_iget(sb, journal_inum);
|
|
if (IS_ERR(journal_inode)) {
|
|
ext4_msg(sb, KERN_ERR, "no journal found");
|
|
return NULL;
|
|
}
|
|
if (!journal_inode->i_nlink) {
|
|
make_bad_inode(journal_inode);
|
|
iput(journal_inode);
|
|
ext4_msg(sb, KERN_ERR, "journal inode is deleted");
|
|
return NULL;
|
|
}
|
|
|
|
jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
|
|
journal_inode, journal_inode->i_size);
|
|
if (!S_ISREG(journal_inode->i_mode)) {
|
|
ext4_msg(sb, KERN_ERR, "invalid journal inode");
|
|
iput(journal_inode);
|
|
return NULL;
|
|
}
|
|
|
|
journal = jbd2_journal_init_inode(journal_inode);
|
|
if (!journal) {
|
|
ext4_msg(sb, KERN_ERR, "Could not load journal inode");
|
|
iput(journal_inode);
|
|
return NULL;
|
|
}
|
|
journal->j_private = sb;
|
|
ext4_init_journal_params(sb, journal);
|
|
return journal;
|
|
}
|
|
|
|
static journal_t *ext4_get_dev_journal(struct super_block *sb,
|
|
dev_t j_dev)
|
|
{
|
|
struct buffer_head *bh;
|
|
journal_t *journal;
|
|
ext4_fsblk_t start;
|
|
ext4_fsblk_t len;
|
|
int hblock, blocksize;
|
|
ext4_fsblk_t sb_block;
|
|
unsigned long offset;
|
|
struct ext4_super_block *es;
|
|
struct block_device *bdev;
|
|
|
|
BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
|
|
|
|
bdev = ext4_blkdev_get(j_dev, sb);
|
|
if (bdev == NULL)
|
|
return NULL;
|
|
|
|
blocksize = sb->s_blocksize;
|
|
hblock = bdev_logical_block_size(bdev);
|
|
if (blocksize < hblock) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"blocksize too small for journal device");
|
|
goto out_bdev;
|
|
}
|
|
|
|
sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
|
|
offset = EXT4_MIN_BLOCK_SIZE % blocksize;
|
|
set_blocksize(bdev, blocksize);
|
|
if (!(bh = __bread(bdev, sb_block, blocksize))) {
|
|
ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
|
|
"external journal");
|
|
goto out_bdev;
|
|
}
|
|
|
|
es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
|
|
if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
|
|
!(le32_to_cpu(es->s_feature_incompat) &
|
|
EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
|
|
ext4_msg(sb, KERN_ERR, "external journal has "
|
|
"bad superblock");
|
|
brelse(bh);
|
|
goto out_bdev;
|
|
}
|
|
|
|
if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
|
|
ext4_msg(sb, KERN_ERR, "journal UUID does not match");
|
|
brelse(bh);
|
|
goto out_bdev;
|
|
}
|
|
|
|
len = ext4_blocks_count(es);
|
|
start = sb_block + 1;
|
|
brelse(bh); /* we're done with the superblock */
|
|
|
|
journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
|
|
start, len, blocksize);
|
|
if (!journal) {
|
|
ext4_msg(sb, KERN_ERR, "failed to create device journal");
|
|
goto out_bdev;
|
|
}
|
|
journal->j_private = sb;
|
|
ll_rw_block(READ, 1, &journal->j_sb_buffer);
|
|
wait_on_buffer(journal->j_sb_buffer);
|
|
if (!buffer_uptodate(journal->j_sb_buffer)) {
|
|
ext4_msg(sb, KERN_ERR, "I/O error on journal device");
|
|
goto out_journal;
|
|
}
|
|
if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
|
|
ext4_msg(sb, KERN_ERR, "External journal has more than one "
|
|
"user (unsupported) - %d",
|
|
be32_to_cpu(journal->j_superblock->s_nr_users));
|
|
goto out_journal;
|
|
}
|
|
EXT4_SB(sb)->journal_bdev = bdev;
|
|
ext4_init_journal_params(sb, journal);
|
|
return journal;
|
|
|
|
out_journal:
|
|
jbd2_journal_destroy(journal);
|
|
out_bdev:
|
|
ext4_blkdev_put(bdev);
|
|
return NULL;
|
|
}
|
|
|
|
static int ext4_load_journal(struct super_block *sb,
|
|
struct ext4_super_block *es,
|
|
unsigned long journal_devnum)
|
|
{
|
|
journal_t *journal;
|
|
unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
|
|
dev_t journal_dev;
|
|
int err = 0;
|
|
int really_read_only;
|
|
|
|
BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
|
|
|
|
if (journal_devnum &&
|
|
journal_devnum != le32_to_cpu(es->s_journal_dev)) {
|
|
ext4_msg(sb, KERN_INFO, "external journal device major/minor "
|
|
"numbers have changed");
|
|
journal_dev = new_decode_dev(journal_devnum);
|
|
} else
|
|
journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
|
|
|
|
really_read_only = bdev_read_only(sb->s_bdev);
|
|
|
|
/*
|
|
* Are we loading a blank journal or performing recovery after a
|
|
* crash? For recovery, we need to check in advance whether we
|
|
* can get read-write access to the device.
|
|
*/
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
|
|
if (sb->s_flags & MS_RDONLY) {
|
|
ext4_msg(sb, KERN_INFO, "INFO: recovery "
|
|
"required on readonly filesystem");
|
|
if (really_read_only) {
|
|
ext4_msg(sb, KERN_ERR, "write access "
|
|
"unavailable, cannot proceed");
|
|
return -EROFS;
|
|
}
|
|
ext4_msg(sb, KERN_INFO, "write access will "
|
|
"be enabled during recovery");
|
|
}
|
|
}
|
|
|
|
if (journal_inum && journal_dev) {
|
|
ext4_msg(sb, KERN_ERR, "filesystem has both journal "
|
|
"and inode journals!");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (journal_inum) {
|
|
if (!(journal = ext4_get_journal(sb, journal_inum)))
|
|
return -EINVAL;
|
|
} else {
|
|
if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!(journal->j_flags & JBD2_BARRIER))
|
|
ext4_msg(sb, KERN_INFO, "barriers disabled");
|
|
|
|
if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
|
|
err = jbd2_journal_wipe(journal, !really_read_only);
|
|
if (!err) {
|
|
char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
|
|
if (save)
|
|
memcpy(save, ((char *) es) +
|
|
EXT4_S_ERR_START, EXT4_S_ERR_LEN);
|
|
err = jbd2_journal_load(journal);
|
|
if (save)
|
|
memcpy(((char *) es) + EXT4_S_ERR_START,
|
|
save, EXT4_S_ERR_LEN);
|
|
kfree(save);
|
|
}
|
|
|
|
if (err) {
|
|
ext4_msg(sb, KERN_ERR, "error loading journal");
|
|
jbd2_journal_destroy(journal);
|
|
return err;
|
|
}
|
|
|
|
EXT4_SB(sb)->s_journal = journal;
|
|
ext4_clear_journal_err(sb, es);
|
|
|
|
if (!really_read_only && journal_devnum &&
|
|
journal_devnum != le32_to_cpu(es->s_journal_dev)) {
|
|
es->s_journal_dev = cpu_to_le32(journal_devnum);
|
|
|
|
/* Make sure we flush the recovery flag to disk. */
|
|
ext4_commit_super(sb, 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ext4_commit_super(struct super_block *sb, int sync)
|
|
{
|
|
struct ext4_super_block *es = EXT4_SB(sb)->s_es;
|
|
struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
|
|
int error = 0;
|
|
|
|
if (!sbh || block_device_ejected(sb))
|
|
return error;
|
|
if (buffer_write_io_error(sbh)) {
|
|
/*
|
|
* Oh, dear. A previous attempt to write the
|
|
* superblock failed. This could happen because the
|
|
* USB device was yanked out. Or it could happen to
|
|
* be a transient write error and maybe the block will
|
|
* be remapped. Nothing we can do but to retry the
|
|
* write and hope for the best.
|
|
*/
|
|
ext4_msg(sb, KERN_ERR, "previous I/O error to "
|
|
"superblock detected");
|
|
clear_buffer_write_io_error(sbh);
|
|
set_buffer_uptodate(sbh);
|
|
}
|
|
/*
|
|
* If the file system is mounted read-only, don't update the
|
|
* superblock write time. This avoids updating the superblock
|
|
* write time when we are mounting the root file system
|
|
* read/only but we need to replay the journal; at that point,
|
|
* for people who are east of GMT and who make their clock
|
|
* tick in localtime for Windows bug-for-bug compatibility,
|
|
* the clock is set in the future, and this will cause e2fsck
|
|
* to complain and force a full file system check.
|
|
*/
|
|
if (!(sb->s_flags & MS_RDONLY))
|
|
es->s_wtime = cpu_to_le32(get_seconds());
|
|
if (sb->s_bdev->bd_part)
|
|
es->s_kbytes_written =
|
|
cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
|
|
((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
|
|
EXT4_SB(sb)->s_sectors_written_start) >> 1));
|
|
else
|
|
es->s_kbytes_written =
|
|
cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
|
|
ext4_free_blocks_count_set(es,
|
|
EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
|
|
&EXT4_SB(sb)->s_freeclusters_counter)));
|
|
es->s_free_inodes_count =
|
|
cpu_to_le32(percpu_counter_sum_positive(
|
|
&EXT4_SB(sb)->s_freeinodes_counter));
|
|
sb->s_dirt = 0;
|
|
BUFFER_TRACE(sbh, "marking dirty");
|
|
mark_buffer_dirty(sbh);
|
|
if (sync) {
|
|
error = sync_dirty_buffer(sbh);
|
|
if (error)
|
|
return error;
|
|
|
|
error = buffer_write_io_error(sbh);
|
|
if (error) {
|
|
ext4_msg(sb, KERN_ERR, "I/O error while writing "
|
|
"superblock");
|
|
clear_buffer_write_io_error(sbh);
|
|
set_buffer_uptodate(sbh);
|
|
}
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Have we just finished recovery? If so, and if we are mounting (or
|
|
* remounting) the filesystem readonly, then we will end up with a
|
|
* consistent fs on disk. Record that fact.
|
|
*/
|
|
static void ext4_mark_recovery_complete(struct super_block *sb,
|
|
struct ext4_super_block *es)
|
|
{
|
|
journal_t *journal = EXT4_SB(sb)->s_journal;
|
|
|
|
if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
|
|
BUG_ON(journal != NULL);
|
|
return;
|
|
}
|
|
jbd2_journal_lock_updates(journal);
|
|
if (jbd2_journal_flush(journal) < 0)
|
|
goto out;
|
|
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
|
|
sb->s_flags & MS_RDONLY) {
|
|
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
|
ext4_commit_super(sb, 1);
|
|
}
|
|
|
|
out:
|
|
jbd2_journal_unlock_updates(journal);
|
|
}
|
|
|
|
/*
|
|
* If we are mounting (or read-write remounting) a filesystem whose journal
|
|
* has recorded an error from a previous lifetime, move that error to the
|
|
* main filesystem now.
|
|
*/
|
|
static void ext4_clear_journal_err(struct super_block *sb,
|
|
struct ext4_super_block *es)
|
|
{
|
|
journal_t *journal;
|
|
int j_errno;
|
|
const char *errstr;
|
|
|
|
BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
|
|
|
|
journal = EXT4_SB(sb)->s_journal;
|
|
|
|
/*
|
|
* Now check for any error status which may have been recorded in the
|
|
* journal by a prior ext4_error() or ext4_abort()
|
|
*/
|
|
|
|
j_errno = jbd2_journal_errno(journal);
|
|
if (j_errno) {
|
|
char nbuf[16];
|
|
|
|
errstr = ext4_decode_error(sb, j_errno, nbuf);
|
|
ext4_warning(sb, "Filesystem error recorded "
|
|
"from previous mount: %s", errstr);
|
|
ext4_warning(sb, "Marking fs in need of filesystem check.");
|
|
|
|
EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
|
|
es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
|
|
ext4_commit_super(sb, 1);
|
|
|
|
jbd2_journal_clear_err(journal);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Force the running and committing transactions to commit,
|
|
* and wait on the commit.
|
|
*/
|
|
int ext4_force_commit(struct super_block *sb)
|
|
{
|
|
journal_t *journal;
|
|
int ret = 0;
|
|
|
|
if (sb->s_flags & MS_RDONLY)
|
|
return 0;
|
|
|
|
journal = EXT4_SB(sb)->s_journal;
|
|
if (journal) {
|
|
vfs_check_frozen(sb, SB_FREEZE_TRANS);
|
|
ret = ext4_journal_force_commit(journal);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ext4_write_super(struct super_block *sb)
|
|
{
|
|
lock_super(sb);
|
|
ext4_commit_super(sb, 1);
|
|
unlock_super(sb);
|
|
}
|
|
|
|
static int ext4_sync_fs(struct super_block *sb, int wait)
|
|
{
|
|
int ret = 0;
|
|
tid_t target;
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
|
|
trace_ext4_sync_fs(sb, wait);
|
|
flush_workqueue(sbi->dio_unwritten_wq);
|
|
if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
|
|
if (wait)
|
|
jbd2_log_wait_commit(sbi->s_journal, target);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* LVM calls this function before a (read-only) snapshot is created. This
|
|
* gives us a chance to flush the journal completely and mark the fs clean.
|
|
*
|
|
* Note that only this function cannot bring a filesystem to be in a clean
|
|
* state independently, because ext4 prevents a new handle from being started
|
|
* by @sb->s_frozen, which stays in an upper layer. It thus needs help from
|
|
* the upper layer.
|
|
*/
|
|
static int ext4_freeze(struct super_block *sb)
|
|
{
|
|
int error = 0;
|
|
journal_t *journal;
|
|
|
|
if (sb->s_flags & MS_RDONLY)
|
|
return 0;
|
|
|
|
journal = EXT4_SB(sb)->s_journal;
|
|
|
|
/* Now we set up the journal barrier. */
|
|
jbd2_journal_lock_updates(journal);
|
|
|
|
/*
|
|
* Don't clear the needs_recovery flag if we failed to flush
|
|
* the journal.
|
|
*/
|
|
error = jbd2_journal_flush(journal);
|
|
if (error < 0)
|
|
goto out;
|
|
|
|
/* Journal blocked and flushed, clear needs_recovery flag. */
|
|
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
|
error = ext4_commit_super(sb, 1);
|
|
out:
|
|
/* we rely on s_frozen to stop further updates */
|
|
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Called by LVM after the snapshot is done. We need to reset the RECOVER
|
|
* flag here, even though the filesystem is not technically dirty yet.
|
|
*/
|
|
static int ext4_unfreeze(struct super_block *sb)
|
|
{
|
|
if (sb->s_flags & MS_RDONLY)
|
|
return 0;
|
|
|
|
lock_super(sb);
|
|
/* Reset the needs_recovery flag before the fs is unlocked. */
|
|
EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
|
ext4_commit_super(sb, 1);
|
|
unlock_super(sb);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Structure to save mount options for ext4_remount's benefit
|
|
*/
|
|
struct ext4_mount_options {
|
|
unsigned long s_mount_opt;
|
|
unsigned long s_mount_opt2;
|
|
uid_t s_resuid;
|
|
gid_t s_resgid;
|
|
unsigned long s_commit_interval;
|
|
u32 s_min_batch_time, s_max_batch_time;
|
|
#ifdef CONFIG_QUOTA
|
|
int s_jquota_fmt;
|
|
char *s_qf_names[MAXQUOTAS];
|
|
#endif
|
|
};
|
|
|
|
static int ext4_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
struct ext4_super_block *es;
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
unsigned long old_sb_flags;
|
|
struct ext4_mount_options old_opts;
|
|
int enable_quota = 0;
|
|
ext4_group_t g;
|
|
unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
|
|
int err = 0;
|
|
#ifdef CONFIG_QUOTA
|
|
int i;
|
|
#endif
|
|
char *orig_data = kstrdup(data, GFP_KERNEL);
|
|
|
|
/* Store the original options */
|
|
lock_super(sb);
|
|
old_sb_flags = sb->s_flags;
|
|
old_opts.s_mount_opt = sbi->s_mount_opt;
|
|
old_opts.s_mount_opt2 = sbi->s_mount_opt2;
|
|
old_opts.s_resuid = sbi->s_resuid;
|
|
old_opts.s_resgid = sbi->s_resgid;
|
|
old_opts.s_commit_interval = sbi->s_commit_interval;
|
|
old_opts.s_min_batch_time = sbi->s_min_batch_time;
|
|
old_opts.s_max_batch_time = sbi->s_max_batch_time;
|
|
#ifdef CONFIG_QUOTA
|
|
old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
|
|
for (i = 0; i < MAXQUOTAS; i++)
|
|
old_opts.s_qf_names[i] = sbi->s_qf_names[i];
|
|
#endif
|
|
if (sbi->s_journal && sbi->s_journal->j_task->io_context)
|
|
journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
|
|
|
|
/*
|
|
* Allow the "check" option to be passed as a remount option.
|
|
*/
|
|
if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
|
|
err = -EINVAL;
|
|
goto restore_opts;
|
|
}
|
|
|
|
if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
|
|
ext4_abort(sb, "Abort forced by user");
|
|
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
|
(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
|
|
|
|
es = sbi->s_es;
|
|
|
|
if (sbi->s_journal) {
|
|
ext4_init_journal_params(sb, sbi->s_journal);
|
|
set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
|
|
}
|
|
|
|
if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
|
|
if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
|
|
err = -EROFS;
|
|
goto restore_opts;
|
|
}
|
|
|
|
if (*flags & MS_RDONLY) {
|
|
err = dquot_suspend(sb, -1);
|
|
if (err < 0)
|
|
goto restore_opts;
|
|
|
|
/*
|
|
* First of all, the unconditional stuff we have to do
|
|
* to disable replay of the journal when we next remount
|
|
*/
|
|
sb->s_flags |= MS_RDONLY;
|
|
|
|
/*
|
|
* OK, test if we are remounting a valid rw partition
|
|
* readonly, and if so set the rdonly flag and then
|
|
* mark the partition as valid again.
|
|
*/
|
|
if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
|
|
(sbi->s_mount_state & EXT4_VALID_FS))
|
|
es->s_state = cpu_to_le16(sbi->s_mount_state);
|
|
|
|
if (sbi->s_journal)
|
|
ext4_mark_recovery_complete(sb, es);
|
|
} else {
|
|
/* Make sure we can mount this feature set readwrite */
|
|
if (!ext4_feature_set_ok(sb, 0)) {
|
|
err = -EROFS;
|
|
goto restore_opts;
|
|
}
|
|
/*
|
|
* Make sure the group descriptor checksums
|
|
* are sane. If they aren't, refuse to remount r/w.
|
|
*/
|
|
for (g = 0; g < sbi->s_groups_count; g++) {
|
|
struct ext4_group_desc *gdp =
|
|
ext4_get_group_desc(sb, g, NULL);
|
|
|
|
if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"ext4_remount: Checksum for group %u failed (%u!=%u)",
|
|
g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
|
|
le16_to_cpu(gdp->bg_checksum));
|
|
err = -EINVAL;
|
|
goto restore_opts;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we have an unprocessed orphan list hanging
|
|
* around from a previously readonly bdev mount,
|
|
* require a full umount/remount for now.
|
|
*/
|
|
if (es->s_last_orphan) {
|
|
ext4_msg(sb, KERN_WARNING, "Couldn't "
|
|
"remount RDWR because of unprocessed "
|
|
"orphan inode list. Please "
|
|
"umount/remount instead");
|
|
err = -EINVAL;
|
|
goto restore_opts;
|
|
}
|
|
|
|
/*
|
|
* Mounting a RDONLY partition read-write, so reread
|
|
* and store the current valid flag. (It may have
|
|
* been changed by e2fsck since we originally mounted
|
|
* the partition.)
|
|
*/
|
|
if (sbi->s_journal)
|
|
ext4_clear_journal_err(sb, es);
|
|
sbi->s_mount_state = le16_to_cpu(es->s_state);
|
|
if (!ext4_setup_super(sb, es, 0))
|
|
sb->s_flags &= ~MS_RDONLY;
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb,
|
|
EXT4_FEATURE_INCOMPAT_MMP))
|
|
if (ext4_multi_mount_protect(sb,
|
|
le64_to_cpu(es->s_mmp_block))) {
|
|
err = -EROFS;
|
|
goto restore_opts;
|
|
}
|
|
enable_quota = 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Reinitialize lazy itable initialization thread based on
|
|
* current settings
|
|
*/
|
|
if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
|
|
ext4_unregister_li_request(sb);
|
|
else {
|
|
ext4_group_t first_not_zeroed;
|
|
first_not_zeroed = ext4_has_uninit_itable(sb);
|
|
ext4_register_li_request(sb, first_not_zeroed);
|
|
}
|
|
|
|
ext4_setup_system_zone(sb);
|
|
if (sbi->s_journal == NULL)
|
|
ext4_commit_super(sb, 1);
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
/* Release old quota file names */
|
|
for (i = 0; i < MAXQUOTAS; i++)
|
|
if (old_opts.s_qf_names[i] &&
|
|
old_opts.s_qf_names[i] != sbi->s_qf_names[i])
|
|
kfree(old_opts.s_qf_names[i]);
|
|
#endif
|
|
unlock_super(sb);
|
|
if (enable_quota)
|
|
dquot_resume(sb, -1);
|
|
|
|
ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
|
|
kfree(orig_data);
|
|
return 0;
|
|
|
|
restore_opts:
|
|
sb->s_flags = old_sb_flags;
|
|
sbi->s_mount_opt = old_opts.s_mount_opt;
|
|
sbi->s_mount_opt2 = old_opts.s_mount_opt2;
|
|
sbi->s_resuid = old_opts.s_resuid;
|
|
sbi->s_resgid = old_opts.s_resgid;
|
|
sbi->s_commit_interval = old_opts.s_commit_interval;
|
|
sbi->s_min_batch_time = old_opts.s_min_batch_time;
|
|
sbi->s_max_batch_time = old_opts.s_max_batch_time;
|
|
#ifdef CONFIG_QUOTA
|
|
sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
|
|
for (i = 0; i < MAXQUOTAS; i++) {
|
|
if (sbi->s_qf_names[i] &&
|
|
old_opts.s_qf_names[i] != sbi->s_qf_names[i])
|
|
kfree(sbi->s_qf_names[i]);
|
|
sbi->s_qf_names[i] = old_opts.s_qf_names[i];
|
|
}
|
|
#endif
|
|
unlock_super(sb);
|
|
kfree(orig_data);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Note: calculating the overhead so we can be compatible with
|
|
* historical BSD practice is quite difficult in the face of
|
|
* clusters/bigalloc. This is because multiple metadata blocks from
|
|
* different block group can end up in the same allocation cluster.
|
|
* Calculating the exact overhead in the face of clustered allocation
|
|
* requires either O(all block bitmaps) in memory or O(number of block
|
|
* groups**2) in time. We will still calculate the superblock for
|
|
* older file systems --- and if we come across with a bigalloc file
|
|
* system with zero in s_overhead_clusters the estimate will be close to
|
|
* correct especially for very large cluster sizes --- but for newer
|
|
* file systems, it's better to calculate this figure once at mkfs
|
|
* time, and store it in the superblock. If the superblock value is
|
|
* present (even for non-bigalloc file systems), we will use it.
|
|
*/
|
|
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_super_block *es = sbi->s_es;
|
|
struct ext4_group_desc *gdp;
|
|
u64 fsid;
|
|
s64 bfree;
|
|
|
|
if (test_opt(sb, MINIX_DF)) {
|
|
sbi->s_overhead_last = 0;
|
|
} else if (es->s_overhead_clusters) {
|
|
sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters);
|
|
} else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
|
|
ext4_group_t i, ngroups = ext4_get_groups_count(sb);
|
|
ext4_fsblk_t overhead = 0;
|
|
|
|
/*
|
|
* Compute the overhead (FS structures). This is constant
|
|
* for a given filesystem unless the number of block groups
|
|
* changes so we cache the previous value until it does.
|
|
*/
|
|
|
|
/*
|
|
* All of the blocks before first_data_block are
|
|
* overhead
|
|
*/
|
|
overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
|
|
|
|
/*
|
|
* Add the overhead found in each block group
|
|
*/
|
|
for (i = 0; i < ngroups; i++) {
|
|
gdp = ext4_get_group_desc(sb, i, NULL);
|
|
overhead += ext4_num_overhead_clusters(sb, i, gdp);
|
|
cond_resched();
|
|
}
|
|
sbi->s_overhead_last = overhead;
|
|
smp_wmb();
|
|
sbi->s_blocks_last = ext4_blocks_count(es);
|
|
}
|
|
|
|
buf->f_type = EXT4_SUPER_MAGIC;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_blocks = (ext4_blocks_count(es) -
|
|
EXT4_C2B(sbi, sbi->s_overhead_last));
|
|
bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
|
|
percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
|
|
/* prevent underflow in case that few free space is available */
|
|
buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
|
|
buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
|
|
if (buf->f_bfree < ext4_r_blocks_count(es))
|
|
buf->f_bavail = 0;
|
|
buf->f_files = le32_to_cpu(es->s_inodes_count);
|
|
buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
|
|
buf->f_namelen = EXT4_NAME_LEN;
|
|
fsid = le64_to_cpup((void *)es->s_uuid) ^
|
|
le64_to_cpup((void *)es->s_uuid + sizeof(u64));
|
|
buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
|
|
buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Helper function for writing quotas on sync - we need to start transaction
|
|
* before quota file is locked for write. Otherwise the are possible deadlocks:
|
|
* Process 1 Process 2
|
|
* ext4_create() quota_sync()
|
|
* jbd2_journal_start() write_dquot()
|
|
* dquot_initialize() down(dqio_mutex)
|
|
* down(dqio_mutex) jbd2_journal_start()
|
|
*
|
|
*/
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
|
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static inline struct inode *dquot_to_inode(struct dquot *dquot)
|
|
{
|
|
return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
|
|
}
|
|
|
|
static int ext4_write_dquot(struct dquot *dquot)
|
|
{
|
|
int ret, err;
|
|
handle_t *handle;
|
|
struct inode *inode;
|
|
|
|
inode = dquot_to_inode(dquot);
|
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handle = ext4_journal_start(inode,
|
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EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
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ret = dquot_commit(dquot);
|
|
err = ext4_journal_stop(handle);
|
|
if (!ret)
|
|
ret = err;
|
|
return ret;
|
|
}
|
|
|
|
static int ext4_acquire_dquot(struct dquot *dquot)
|
|
{
|
|
int ret, err;
|
|
handle_t *handle;
|
|
|
|
handle = ext4_journal_start(dquot_to_inode(dquot),
|
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EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
|
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if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
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ret = dquot_acquire(dquot);
|
|
err = ext4_journal_stop(handle);
|
|
if (!ret)
|
|
ret = err;
|
|
return ret;
|
|
}
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|
|
|
static int ext4_release_dquot(struct dquot *dquot)
|
|
{
|
|
int ret, err;
|
|
handle_t *handle;
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|
|
|
handle = ext4_journal_start(dquot_to_inode(dquot),
|
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EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
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if (IS_ERR(handle)) {
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|
/* Release dquot anyway to avoid endless cycle in dqput() */
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|
dquot_release(dquot);
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|
return PTR_ERR(handle);
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|
}
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ret = dquot_release(dquot);
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|
err = ext4_journal_stop(handle);
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|
if (!ret)
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|
ret = err;
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|
return ret;
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|
}
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|
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static int ext4_mark_dquot_dirty(struct dquot *dquot)
|
|
{
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/* Are we journaling quotas? */
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if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
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EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
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dquot_mark_dquot_dirty(dquot);
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return ext4_write_dquot(dquot);
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} else {
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return dquot_mark_dquot_dirty(dquot);
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}
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}
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static int ext4_write_info(struct super_block *sb, int type)
|
|
{
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int ret, err;
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handle_t *handle;
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|
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/* Data block + inode block */
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handle = ext4_journal_start(sb->s_root->d_inode, 2);
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if (IS_ERR(handle))
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return PTR_ERR(handle);
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ret = dquot_commit_info(sb, type);
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err = ext4_journal_stop(handle);
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if (!ret)
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ret = err;
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return ret;
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}
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/*
|
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* Turn on quotas during mount time - we need to find
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* the quota file and such...
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*/
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static int ext4_quota_on_mount(struct super_block *sb, int type)
|
|
{
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return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
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EXT4_SB(sb)->s_jquota_fmt, type);
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}
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|
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/*
|
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* Standard function to be called on quota_on
|
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*/
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static int ext4_quota_on(struct super_block *sb, int type, int format_id,
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struct path *path)
|
|
{
|
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int err;
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|
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if (!test_opt(sb, QUOTA))
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return -EINVAL;
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|
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/* Quotafile not on the same filesystem? */
|
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if (path->dentry->d_sb != sb)
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return -EXDEV;
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/* Journaling quota? */
|
|
if (EXT4_SB(sb)->s_qf_names[type]) {
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/* Quotafile not in fs root? */
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|
if (path->dentry->d_parent != sb->s_root)
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ext4_msg(sb, KERN_WARNING,
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"Quota file not on filesystem root. "
|
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"Journaled quota will not work");
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}
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|
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/*
|
|
* When we journal data on quota file, we have to flush journal to see
|
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* all updates to the file when we bypass pagecache...
|
|
*/
|
|
if (EXT4_SB(sb)->s_journal &&
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ext4_should_journal_data(path->dentry->d_inode)) {
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/*
|
|
* We don't need to lock updates but journal_flush() could
|
|
* otherwise be livelocked...
|
|
*/
|
|
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
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|
err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
|
|
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
|
|
if (err)
|
|
return err;
|
|
}
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|
|
|
return dquot_quota_on(sb, type, format_id, path);
|
|
}
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|
|
|
static int ext4_quota_off(struct super_block *sb, int type)
|
|
{
|
|
struct inode *inode = sb_dqopt(sb)->files[type];
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handle_t *handle;
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|
|
|
/* Force all delayed allocation blocks to be allocated.
|
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* Caller already holds s_umount sem */
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if (test_opt(sb, DELALLOC))
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sync_filesystem(sb);
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|
if (!inode)
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goto out;
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/* Update modification times of quota files when userspace can
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* start looking at them */
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|
handle = ext4_journal_start(inode, 1);
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if (IS_ERR(handle))
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|
goto out;
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inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
ext4_journal_stop(handle);
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|
|
|
out:
|
|
return dquot_quota_off(sb, type);
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}
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/* Read data from quotafile - avoid pagecache and such because we cannot afford
|
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* acquiring the locks... As quota files are never truncated and quota code
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* itself serializes the operations (and no one else should touch the files)
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* we don't have to be afraid of races */
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static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
|
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size_t len, loff_t off)
|
|
{
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|
struct inode *inode = sb_dqopt(sb)->files[type];
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ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
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int err = 0;
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int offset = off & (sb->s_blocksize - 1);
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int tocopy;
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size_t toread;
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struct buffer_head *bh;
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loff_t i_size = i_size_read(inode);
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if (off > i_size)
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return 0;
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if (off+len > i_size)
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len = i_size-off;
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toread = len;
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while (toread > 0) {
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tocopy = sb->s_blocksize - offset < toread ?
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sb->s_blocksize - offset : toread;
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bh = ext4_bread(NULL, inode, blk, 0, &err);
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if (err)
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return err;
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if (!bh) /* A hole? */
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memset(data, 0, tocopy);
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else
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memcpy(data, bh->b_data+offset, tocopy);
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brelse(bh);
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offset = 0;
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toread -= tocopy;
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data += tocopy;
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blk++;
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}
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return len;
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}
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/* Write to quotafile (we know the transaction is already started and has
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* enough credits) */
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static ssize_t ext4_quota_write(struct super_block *sb, int type,
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const char *data, size_t len, loff_t off)
|
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{
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|
struct inode *inode = sb_dqopt(sb)->files[type];
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ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
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int err = 0;
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int offset = off & (sb->s_blocksize - 1);
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struct buffer_head *bh;
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handle_t *handle = journal_current_handle();
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|
|
|
if (EXT4_SB(sb)->s_journal && !handle) {
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ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
|
|
" cancelled because transaction is not started",
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(unsigned long long)off, (unsigned long long)len);
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return -EIO;
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}
|
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/*
|
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* Since we account only one data block in transaction credits,
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* then it is impossible to cross a block boundary.
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*/
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if (sb->s_blocksize - offset < len) {
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ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
|
|
" cancelled because not block aligned",
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(unsigned long long)off, (unsigned long long)len);
|
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return -EIO;
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|
}
|
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|
|
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
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bh = ext4_bread(handle, inode, blk, 1, &err);
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if (!bh)
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goto out;
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err = ext4_journal_get_write_access(handle, bh);
|
|
if (err) {
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|
brelse(bh);
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goto out;
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|
}
|
|
lock_buffer(bh);
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memcpy(bh->b_data+offset, data, len);
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|
flush_dcache_page(bh->b_page);
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|
unlock_buffer(bh);
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err = ext4_handle_dirty_metadata(handle, NULL, bh);
|
|
brelse(bh);
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out:
|
|
if (err) {
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|
mutex_unlock(&inode->i_mutex);
|
|
return err;
|
|
}
|
|
if (inode->i_size < off + len) {
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|
i_size_write(inode, off + len);
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|
EXT4_I(inode)->i_disksize = inode->i_size;
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
}
|
|
mutex_unlock(&inode->i_mutex);
|
|
return len;
|
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}
|
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|
|
#endif
|
|
|
|
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
|
|
const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
|
|
}
|
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|
|
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
|
|
static inline void register_as_ext2(void)
|
|
{
|
|
int err = register_filesystem(&ext2_fs_type);
|
|
if (err)
|
|
printk(KERN_WARNING
|
|
"EXT4-fs: Unable to register as ext2 (%d)\n", err);
|
|
}
|
|
|
|
static inline void unregister_as_ext2(void)
|
|
{
|
|
unregister_filesystem(&ext2_fs_type);
|
|
}
|
|
|
|
static inline int ext2_feature_set_ok(struct super_block *sb)
|
|
{
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
|
|
return 0;
|
|
if (sb->s_flags & MS_RDONLY)
|
|
return 1;
|
|
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
MODULE_ALIAS("ext2");
|
|
#else
|
|
static inline void register_as_ext2(void) { }
|
|
static inline void unregister_as_ext2(void) { }
|
|
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
|
|
#endif
|
|
|
|
#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
|
|
static inline void register_as_ext3(void)
|
|
{
|
|
int err = register_filesystem(&ext3_fs_type);
|
|
if (err)
|
|
printk(KERN_WARNING
|
|
"EXT4-fs: Unable to register as ext3 (%d)\n", err);
|
|
}
|
|
|
|
static inline void unregister_as_ext3(void)
|
|
{
|
|
unregister_filesystem(&ext3_fs_type);
|
|
}
|
|
|
|
static inline int ext3_feature_set_ok(struct super_block *sb)
|
|
{
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
|
|
return 0;
|
|
if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
|
|
return 0;
|
|
if (sb->s_flags & MS_RDONLY)
|
|
return 1;
|
|
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
MODULE_ALIAS("ext3");
|
|
#else
|
|
static inline void register_as_ext3(void) { }
|
|
static inline void unregister_as_ext3(void) { }
|
|
static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
|
|
#endif
|
|
|
|
static struct file_system_type ext4_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ext4",
|
|
.mount = ext4_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init ext4_init_feat_adverts(void)
|
|
{
|
|
struct ext4_features *ef;
|
|
int ret = -ENOMEM;
|
|
|
|
ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
|
|
if (!ef)
|
|
goto out;
|
|
|
|
ef->f_kobj.kset = ext4_kset;
|
|
init_completion(&ef->f_kobj_unregister);
|
|
ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
|
|
"features");
|
|
if (ret) {
|
|
kfree(ef);
|
|
goto out;
|
|
}
|
|
|
|
ext4_feat = ef;
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void ext4_exit_feat_adverts(void)
|
|
{
|
|
kobject_put(&ext4_feat->f_kobj);
|
|
wait_for_completion(&ext4_feat->f_kobj_unregister);
|
|
kfree(ext4_feat);
|
|
}
|
|
|
|
/* Shared across all ext4 file systems */
|
|
wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
|
|
struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
|
|
|
|
static int __init ext4_init_fs(void)
|
|
{
|
|
int i, err;
|
|
|
|
ext4_li_info = NULL;
|
|
mutex_init(&ext4_li_mtx);
|
|
|
|
ext4_check_flag_values();
|
|
|
|
for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
|
|
mutex_init(&ext4__aio_mutex[i]);
|
|
init_waitqueue_head(&ext4__ioend_wq[i]);
|
|
}
|
|
|
|
err = ext4_init_pageio();
|
|
if (err)
|
|
return err;
|
|
err = ext4_init_system_zone();
|
|
if (err)
|
|
goto out6;
|
|
ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
|
|
if (!ext4_kset)
|
|
goto out5;
|
|
ext4_proc_root = proc_mkdir("fs/ext4", NULL);
|
|
|
|
err = ext4_init_feat_adverts();
|
|
if (err)
|
|
goto out4;
|
|
|
|
err = ext4_init_mballoc();
|
|
if (err)
|
|
goto out3;
|
|
|
|
err = ext4_init_xattr();
|
|
if (err)
|
|
goto out2;
|
|
err = init_inodecache();
|
|
if (err)
|
|
goto out1;
|
|
register_as_ext3();
|
|
register_as_ext2();
|
|
err = register_filesystem(&ext4_fs_type);
|
|
if (err)
|
|
goto out;
|
|
|
|
return 0;
|
|
out:
|
|
unregister_as_ext2();
|
|
unregister_as_ext3();
|
|
destroy_inodecache();
|
|
out1:
|
|
ext4_exit_xattr();
|
|
out2:
|
|
ext4_exit_mballoc();
|
|
out3:
|
|
ext4_exit_feat_adverts();
|
|
out4:
|
|
if (ext4_proc_root)
|
|
remove_proc_entry("fs/ext4", NULL);
|
|
kset_unregister(ext4_kset);
|
|
out5:
|
|
ext4_exit_system_zone();
|
|
out6:
|
|
ext4_exit_pageio();
|
|
return err;
|
|
}
|
|
|
|
static void __exit ext4_exit_fs(void)
|
|
{
|
|
ext4_destroy_lazyinit_thread();
|
|
unregister_as_ext2();
|
|
unregister_as_ext3();
|
|
unregister_filesystem(&ext4_fs_type);
|
|
destroy_inodecache();
|
|
ext4_exit_xattr();
|
|
ext4_exit_mballoc();
|
|
ext4_exit_feat_adverts();
|
|
remove_proc_entry("fs/ext4", NULL);
|
|
kset_unregister(ext4_kset);
|
|
ext4_exit_system_zone();
|
|
ext4_exit_pageio();
|
|
}
|
|
|
|
MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
|
|
MODULE_DESCRIPTION("Fourth Extended Filesystem");
|
|
MODULE_LICENSE("GPL");
|
|
module_init(ext4_init_fs)
|
|
module_exit(ext4_exit_fs)
|