2860 lines
79 KiB
C
2860 lines
79 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/jbd2.h>
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#include <linux/ext4_fs.h>
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#include <linux/ext4_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/smp_lock.h>
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#include <linux/buffer_head.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 <asm/uaccess.h>
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#include "xattr.h"
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#include "acl.h"
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#include "namei.h"
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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_create_journal(struct super_block *, struct ext4_super_block *,
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unsigned int);
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static void ext4_commit_super (struct super_block * sb,
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struct ext4_super_block * es,
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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 void ext4_unlockfs(struct super_block *sb);
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static void ext4_write_super (struct super_block * sb);
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static void ext4_write_super_lockfs(struct super_block *sb);
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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) |
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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) |
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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) |
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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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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 = 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 = 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 = 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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/*
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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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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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if (sb->s_flags & MS_RDONLY)
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return ERR_PTR(-EROFS);
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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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journal = EXT4_SB(sb)->s_journal;
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if (is_journal_aborted(journal)) {
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ext4_abort(sb, __FUNCTION__,
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"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, 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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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, err);
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return err;
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}
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void ext4_journal_abort_handle(const char *caller, const char *err_fn,
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struct buffer_head *bh, 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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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 "%s: aborting transaction: %s in %s\n",
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caller, errstr, err_fn);
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jbd2_journal_abort_handle(handle);
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}
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/* Deal with the reporting of failure conditions on a filesystem such as
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* inconsistencies detected or read IO failures.
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*
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* On ext2, we can store the error state of the filesystem in the
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* superblock. That is not possible on ext4, because we may have other
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* write ordering constraints on the superblock which prevent us from
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* writing it out straight away; and given that the journal is about to
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* be aborted, we can't rely on the current, or future, transactions to
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* write out the superblock safely.
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*
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* We'll just use the jbd2_journal_abort() error code to record an error in
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* the journal instead. On recovery, the journal will compain about
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* that error until we've noted it down and cleared it.
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*/
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static void ext4_handle_error(struct super_block *sb)
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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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if (sb->s_flags & MS_RDONLY)
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return;
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if (!test_opt (sb, ERRORS_CONT)) {
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journal_t *journal = EXT4_SB(sb)->s_journal;
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EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
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if (journal)
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jbd2_journal_abort(journal, -EIO);
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}
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if (test_opt (sb, ERRORS_RO)) {
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printk (KERN_CRIT "Remounting filesystem read-only\n");
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sb->s_flags |= MS_RDONLY;
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}
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ext4_commit_super(sb, es, 1);
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if (test_opt(sb, ERRORS_PANIC))
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panic("EXT4-fs (device %s): panic forced after error\n",
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sb->s_id);
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}
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void ext4_error (struct super_block * sb, const char * function,
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const char * fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
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vprintk(fmt, args);
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printk("\n");
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va_end(args);
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ext4_handle_error(sb);
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}
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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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{
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char *errstr = NULL;
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switch (errno) {
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case -EIO:
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errstr = "IO failure";
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break;
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case -ENOMEM:
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errstr = "Out of memory";
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break;
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case -EROFS:
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if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
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errstr = "Journal has aborted";
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else
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errstr = "Readonly filesystem";
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break;
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default:
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/* If the caller passed in an extra buffer for unknown
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* errors, textualise them now. Else we just return
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* NULL. */
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if (nbuf) {
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/* Check for truncated error codes... */
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if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
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errstr = nbuf;
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}
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break;
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}
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return errstr;
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}
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/* __ext4_std_error decodes expected errors from journaling functions
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* automatically and invokes the appropriate error response. */
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void __ext4_std_error (struct super_block * sb, const char * function,
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int errno)
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{
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char nbuf[16];
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const char *errstr;
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/* Special case: if the error is EROFS, and we're not already
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* inside a transaction, then there's really no point in logging
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* an error. */
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if (errno == -EROFS && journal_current_handle() == NULL &&
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(sb->s_flags & MS_RDONLY))
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return;
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errstr = ext4_decode_error(sb, errno, nbuf);
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printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
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sb->s_id, function, errstr);
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ext4_handle_error(sb);
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}
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/*
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* ext4_abort is a much stronger failure handler than ext4_error. The
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* abort function may be used to deal with unrecoverable failures such
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* as journal IO errors or ENOMEM at a critical moment in log management.
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*
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* We unconditionally force the filesystem into an ABORT|READONLY state,
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* unless the error response on the fs has been set to panic in which
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* case we take the easy way out and panic immediately.
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*/
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void ext4_abort (struct super_block * sb, const char * function,
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const char * fmt, ...)
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{
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va_list args;
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printk (KERN_CRIT "ext4_abort called.\n");
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va_start(args, fmt);
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printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
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vprintk(fmt, args);
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printk("\n");
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va_end(args);
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if (test_opt(sb, ERRORS_PANIC))
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panic("EXT4-fs panic from previous error\n");
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if (sb->s_flags & MS_RDONLY)
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return;
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printk(KERN_CRIT "Remounting filesystem read-only\n");
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EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
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sb->s_flags |= MS_RDONLY;
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EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
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jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
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}
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void ext4_warning (struct super_block * sb, const char * function,
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const char * fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
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sb->s_id, function);
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vprintk(fmt, args);
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printk("\n");
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va_end(args);
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}
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void ext4_update_dynamic_rev(struct super_block *sb)
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{
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struct ext4_super_block *es = EXT4_SB(sb)->s_es;
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if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
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return;
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ext4_warning(sb, __FUNCTION__,
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"updating to rev %d because of new feature flag, "
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"running e2fsck is recommended",
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EXT4_DYNAMIC_REV);
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es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
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es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
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es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
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/* leave es->s_feature_*compat flags alone */
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/* es->s_uuid will be set by e2fsck if empty */
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/*
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* The rest of the superblock fields should be zero, and if not it
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* means they are likely already in use, so leave them alone. We
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* can leave it up to e2fsck to clean up any inconsistencies there.
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*/
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}
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/*
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* Open the external journal device
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*/
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static struct block_device *ext4_blkdev_get(dev_t dev)
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{
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struct block_device *bdev;
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char b[BDEVNAME_SIZE];
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bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
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if (IS_ERR(bdev))
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goto fail;
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return bdev;
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fail:
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printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
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__bdevname(dev, b), PTR_ERR(bdev));
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return NULL;
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}
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|
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/*
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* Release the journal device
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*/
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static int ext4_blkdev_put(struct block_device *bdev)
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{
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bd_release(bdev);
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return blkdev_put(bdev);
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}
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|
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static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
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{
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struct block_device *bdev;
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int ret = -ENODEV;
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bdev = sbi->journal_bdev;
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if (bdev) {
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ret = ext4_blkdev_put(bdev);
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sbi->journal_bdev = NULL;
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}
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return ret;
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}
|
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|
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static inline struct inode *orphan_list_entry(struct list_head *l)
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{
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return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
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}
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|
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static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
|
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{
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struct list_head *l;
|
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|
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printk(KERN_ERR "sb orphan head is %d\n",
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le32_to_cpu(sbi->s_es->s_last_orphan));
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|
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printk(KERN_ERR "sb_info orphan list:\n");
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list_for_each(l, &sbi->s_orphan) {
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struct inode *inode = orphan_list_entry(l);
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printk(KERN_ERR " "
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"inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
|
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inode->i_sb->s_id, inode->i_ino, inode,
|
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inode->i_mode, inode->i_nlink,
|
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NEXT_ORPHAN(inode));
|
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}
|
|
}
|
|
|
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static void ext4_put_super (struct super_block * sb)
|
|
{
|
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struct ext4_sb_info *sbi = EXT4_SB(sb);
|
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struct ext4_super_block *es = sbi->s_es;
|
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int i;
|
|
|
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ext4_ext_release(sb);
|
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ext4_xattr_put_super(sb);
|
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jbd2_journal_destroy(sbi->s_journal);
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
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EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
|
es->s_state = cpu_to_le16(sbi->s_mount_state);
|
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BUFFER_TRACE(sbi->s_sbh, "marking dirty");
|
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mark_buffer_dirty(sbi->s_sbh);
|
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ext4_commit_super(sb, es, 1);
|
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}
|
|
|
|
for (i = 0; i < sbi->s_gdb_count; i++)
|
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brelse(sbi->s_group_desc[i]);
|
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kfree(sbi->s_group_desc);
|
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percpu_counter_destroy(&sbi->s_freeblocks_counter);
|
|
percpu_counter_destroy(&sbi->s_freeinodes_counter);
|
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percpu_counter_destroy(&sbi->s_dirs_counter);
|
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brelse(sbi->s_sbh);
|
|
#ifdef CONFIG_QUOTA
|
|
for (i = 0; i < MAXQUOTAS; i++)
|
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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. */
|
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if (!list_empty(&sbi->s_orphan))
|
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dump_orphan_list(sb, sbi);
|
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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);
|
|
}
|
|
sb->s_fs_info = NULL;
|
|
kfree(sbi);
|
|
return;
|
|
}
|
|
|
|
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;
|
|
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
|
|
ei->i_acl = EXT4_ACL_NOT_CACHED;
|
|
ei->i_default_acl = EXT4_ACL_NOT_CACHED;
|
|
#endif
|
|
ei->i_block_alloc_info = NULL;
|
|
ei->vfs_inode.i_version = 1;
|
|
memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
|
|
return &ei->vfs_inode;
|
|
}
|
|
|
|
static void ext4_destroy_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
|
|
}
|
|
|
|
static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
|
|
{
|
|
struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
|
|
|
|
if (flags & SLAB_CTOR_CONSTRUCTOR) {
|
|
INIT_LIST_HEAD(&ei->i_orphan);
|
|
#ifdef CONFIG_EXT4DEV_FS_XATTR
|
|
init_rwsem(&ei->xattr_sem);
|
|
#endif
|
|
mutex_init(&ei->truncate_mutex);
|
|
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, NULL);
|
|
if (ext4_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_inodecache(void)
|
|
{
|
|
kmem_cache_destroy(ext4_inode_cachep);
|
|
}
|
|
|
|
static void ext4_clear_inode(struct inode *inode)
|
|
{
|
|
struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
|
|
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
|
|
if (EXT4_I(inode)->i_acl &&
|
|
EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
|
|
posix_acl_release(EXT4_I(inode)->i_acl);
|
|
EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
|
|
}
|
|
if (EXT4_I(inode)->i_default_acl &&
|
|
EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
|
|
posix_acl_release(EXT4_I(inode)->i_default_acl);
|
|
EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
|
|
}
|
|
#endif
|
|
ext4_discard_reservation(inode);
|
|
EXT4_I(inode)->i_block_alloc_info = NULL;
|
|
if (unlikely(rsv))
|
|
kfree(rsv);
|
|
}
|
|
|
|
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)
|
|
seq_printf(seq, ",jqfmt=%s",
|
|
(sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
|
|
|
|
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 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
|
|
seq_puts(seq, ",usrquota");
|
|
|
|
if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
|
|
seq_puts(seq, ",grpquota");
|
|
#endif
|
|
}
|
|
|
|
static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
|
|
{
|
|
struct super_block *sb = vfs->mnt_sb;
|
|
|
|
if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
|
|
seq_puts(seq, ",data=journal");
|
|
else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
|
|
seq_puts(seq, ",data=ordered");
|
|
else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
|
|
seq_puts(seq, ",data=writeback");
|
|
|
|
ext4_show_quota_options(seq, sb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp)
|
|
{
|
|
__u32 *objp = vobjp;
|
|
unsigned long ino = objp[0];
|
|
__u32 generation = objp[1];
|
|
struct inode *inode;
|
|
struct dentry *result;
|
|
|
|
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 = iget(sb, ino);
|
|
if (inode == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (is_bad_inode(inode) ||
|
|
(generation && inode->i_generation != generation)) {
|
|
iput(inode);
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
/* now to find a dentry.
|
|
* If possible, get a well-connected one
|
|
*/
|
|
result = d_alloc_anon(inode);
|
|
if (!result) {
|
|
iput(inode);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
|
|
#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
|
|
|
|
static int ext4_dquot_initialize(struct inode *inode, int type);
|
|
static int ext4_dquot_drop(struct inode *inode);
|
|
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, char *path);
|
|
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 struct dquot_operations ext4_quota_operations = {
|
|
.initialize = ext4_dquot_initialize,
|
|
.drop = ext4_dquot_drop,
|
|
.alloc_space = dquot_alloc_space,
|
|
.alloc_inode = dquot_alloc_inode,
|
|
.free_space = dquot_free_space,
|
|
.free_inode = dquot_free_inode,
|
|
.transfer = dquot_transfer,
|
|
.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
|
|
};
|
|
|
|
static struct quotactl_ops ext4_qctl_operations = {
|
|
.quota_on = ext4_quota_on,
|
|
.quota_off = vfs_quota_off,
|
|
.quota_sync = vfs_quota_sync,
|
|
.get_info = vfs_get_dqinfo,
|
|
.set_info = vfs_set_dqinfo,
|
|
.get_dqblk = vfs_get_dqblk,
|
|
.set_dqblk = vfs_set_dqblk
|
|
};
|
|
#endif
|
|
|
|
static const struct super_operations ext4_sops = {
|
|
.alloc_inode = ext4_alloc_inode,
|
|
.destroy_inode = ext4_destroy_inode,
|
|
.read_inode = ext4_read_inode,
|
|
.write_inode = ext4_write_inode,
|
|
.dirty_inode = ext4_dirty_inode,
|
|
.delete_inode = ext4_delete_inode,
|
|
.put_super = ext4_put_super,
|
|
.write_super = ext4_write_super,
|
|
.sync_fs = ext4_sync_fs,
|
|
.write_super_lockfs = ext4_write_super_lockfs,
|
|
.unlockfs = ext4_unlockfs,
|
|
.statfs = ext4_statfs,
|
|
.remount_fs = ext4_remount,
|
|
.clear_inode = ext4_clear_inode,
|
|
.show_options = ext4_show_options,
|
|
#ifdef CONFIG_QUOTA
|
|
.quota_read = ext4_quota_read,
|
|
.quota_write = ext4_quota_write,
|
|
#endif
|
|
};
|
|
|
|
static struct export_operations ext4_export_ops = {
|
|
.get_parent = ext4_get_parent,
|
|
.get_dentry = ext4_get_dentry,
|
|
};
|
|
|
|
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_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
|
|
Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
|
|
Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
|
|
Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
|
|
Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
|
|
Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
|
|
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
|
|
Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
|
|
Opt_grpquota, Opt_extents,
|
|
};
|
|
|
|
static 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_nocheck, "nocheck"},
|
|
{Opt_nocheck, "check=none"},
|
|
{Opt_debug, "debug"},
|
|
{Opt_oldalloc, "oldalloc"},
|
|
{Opt_orlov, "orlov"},
|
|
{Opt_user_xattr, "user_xattr"},
|
|
{Opt_nouser_xattr, "nouser_xattr"},
|
|
{Opt_acl, "acl"},
|
|
{Opt_noacl, "noacl"},
|
|
{Opt_reservation, "reservation"},
|
|
{Opt_noreservation, "noreservation"},
|
|
{Opt_noload, "noload"},
|
|
{Opt_nobh, "nobh"},
|
|
{Opt_bh, "bh"},
|
|
{Opt_commit, "commit=%u"},
|
|
{Opt_journal_update, "journal=update"},
|
|
{Opt_journal_inum, "journal=%u"},
|
|
{Opt_journal_dev, "journal_dev=%u"},
|
|
{Opt_abort, "abort"},
|
|
{Opt_data_journal, "data=journal"},
|
|
{Opt_data_ordered, "data=ordered"},
|
|
{Opt_data_writeback, "data=writeback"},
|
|
{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_grpquota, "grpquota"},
|
|
{Opt_noquota, "noquota"},
|
|
{Opt_quota, "quota"},
|
|
{Opt_usrquota, "usrquota"},
|
|
{Opt_barrier, "barrier=%u"},
|
|
{Opt_extents, "extents"},
|
|
{Opt_err, NULL},
|
|
{Opt_resize, "resize"},
|
|
};
|
|
|
|
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("EXT4-fs: Invalid sb specification: %s\n",
|
|
(char *) *data);
|
|
return 1;
|
|
}
|
|
if (*options == ',')
|
|
options++;
|
|
*data = (void *) options;
|
|
return sb_block;
|
|
}
|
|
|
|
static int parse_options (char *options, struct super_block *sb,
|
|
unsigned int *inum, unsigned long *journal_devnum,
|
|
ext4_fsblk_t *n_blocks_count, int is_remount)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
char * p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int data_opt = 0;
|
|
int option;
|
|
#ifdef CONFIG_QUOTA
|
|
int qtype;
|
|
char *qname;
|
|
#endif
|
|
|
|
if (!options)
|
|
return 1;
|
|
|
|
while ((p = strsep (&options, ",")) != NULL) {
|
|
int token;
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, tokens, args);
|
|
switch (token) {
|
|
case Opt_bsd_df:
|
|
clear_opt (sbi->s_mount_opt, MINIX_DF);
|
|
break;
|
|
case Opt_minix_df:
|
|
set_opt (sbi->s_mount_opt, MINIX_DF);
|
|
break;
|
|
case Opt_grpid:
|
|
set_opt (sbi->s_mount_opt, GRPID);
|
|
break;
|
|
case Opt_nogrpid:
|
|
clear_opt (sbi->s_mount_opt, GRPID);
|
|
break;
|
|
case Opt_resuid:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
sbi->s_resuid = option;
|
|
break;
|
|
case Opt_resgid:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
sbi->s_resgid = option;
|
|
break;
|
|
case Opt_sb:
|
|
/* handled by get_sb_block() instead of here */
|
|
/* *sb_block = match_int(&args[0]); */
|
|
break;
|
|
case Opt_err_panic:
|
|
clear_opt (sbi->s_mount_opt, ERRORS_CONT);
|
|
clear_opt (sbi->s_mount_opt, ERRORS_RO);
|
|
set_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
|
break;
|
|
case Opt_err_ro:
|
|
clear_opt (sbi->s_mount_opt, ERRORS_CONT);
|
|
clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
|
set_opt (sbi->s_mount_opt, ERRORS_RO);
|
|
break;
|
|
case Opt_err_cont:
|
|
clear_opt (sbi->s_mount_opt, ERRORS_RO);
|
|
clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
|
set_opt (sbi->s_mount_opt, ERRORS_CONT);
|
|
break;
|
|
case Opt_nouid32:
|
|
set_opt (sbi->s_mount_opt, NO_UID32);
|
|
break;
|
|
case Opt_nocheck:
|
|
clear_opt (sbi->s_mount_opt, CHECK);
|
|
break;
|
|
case Opt_debug:
|
|
set_opt (sbi->s_mount_opt, DEBUG);
|
|
break;
|
|
case Opt_oldalloc:
|
|
set_opt (sbi->s_mount_opt, OLDALLOC);
|
|
break;
|
|
case Opt_orlov:
|
|
clear_opt (sbi->s_mount_opt, OLDALLOC);
|
|
break;
|
|
#ifdef CONFIG_EXT4DEV_FS_XATTR
|
|
case Opt_user_xattr:
|
|
set_opt (sbi->s_mount_opt, XATTR_USER);
|
|
break;
|
|
case Opt_nouser_xattr:
|
|
clear_opt (sbi->s_mount_opt, XATTR_USER);
|
|
break;
|
|
#else
|
|
case Opt_user_xattr:
|
|
case Opt_nouser_xattr:
|
|
printk("EXT4 (no)user_xattr options not supported\n");
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
|
|
case Opt_acl:
|
|
set_opt(sbi->s_mount_opt, POSIX_ACL);
|
|
break;
|
|
case Opt_noacl:
|
|
clear_opt(sbi->s_mount_opt, POSIX_ACL);
|
|
break;
|
|
#else
|
|
case Opt_acl:
|
|
case Opt_noacl:
|
|
printk("EXT4 (no)acl options not supported\n");
|
|
break;
|
|
#endif
|
|
case Opt_reservation:
|
|
set_opt(sbi->s_mount_opt, RESERVATION);
|
|
break;
|
|
case Opt_noreservation:
|
|
clear_opt(sbi->s_mount_opt, RESERVATION);
|
|
break;
|
|
case Opt_journal_update:
|
|
/* @@@ FIXME */
|
|
/* Eventually we will want to be able to create
|
|
a journal file here. For now, only allow the
|
|
user to specify an existing inode to be the
|
|
journal file. */
|
|
if (is_remount) {
|
|
printk(KERN_ERR "EXT4-fs: cannot specify "
|
|
"journal on remount\n");
|
|
return 0;
|
|
}
|
|
set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
|
|
break;
|
|
case Opt_journal_inum:
|
|
if (is_remount) {
|
|
printk(KERN_ERR "EXT4-fs: cannot specify "
|
|
"journal on remount\n");
|
|
return 0;
|
|
}
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
*inum = option;
|
|
break;
|
|
case Opt_journal_dev:
|
|
if (is_remount) {
|
|
printk(KERN_ERR "EXT4-fs: cannot specify "
|
|
"journal on remount\n");
|
|
return 0;
|
|
}
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
*journal_devnum = option;
|
|
break;
|
|
case Opt_noload:
|
|
set_opt (sbi->s_mount_opt, NOLOAD);
|
|
break;
|
|
case Opt_commit:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
if (option < 0)
|
|
return 0;
|
|
if (option == 0)
|
|
option = JBD_DEFAULT_MAX_COMMIT_AGE;
|
|
sbi->s_commit_interval = HZ * option;
|
|
break;
|
|
case Opt_data_journal:
|
|
data_opt = EXT4_MOUNT_JOURNAL_DATA;
|
|
goto datacheck;
|
|
case Opt_data_ordered:
|
|
data_opt = EXT4_MOUNT_ORDERED_DATA;
|
|
goto datacheck;
|
|
case Opt_data_writeback:
|
|
data_opt = EXT4_MOUNT_WRITEBACK_DATA;
|
|
datacheck:
|
|
if (is_remount) {
|
|
if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
|
|
!= data_opt) {
|
|
printk(KERN_ERR
|
|
"EXT4-fs: cannot change data "
|
|
"mode on remount\n");
|
|
return 0;
|
|
}
|
|
} else {
|
|
sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
|
|
sbi->s_mount_opt |= data_opt;
|
|
}
|
|
break;
|
|
#ifdef CONFIG_QUOTA
|
|
case Opt_usrjquota:
|
|
qtype = USRQUOTA;
|
|
goto set_qf_name;
|
|
case Opt_grpjquota:
|
|
qtype = GRPQUOTA;
|
|
set_qf_name:
|
|
if (sb_any_quota_enabled(sb)) {
|
|
printk(KERN_ERR
|
|
"EXT4-fs: Cannot change journalled "
|
|
"quota options when quota turned on.\n");
|
|
return 0;
|
|
}
|
|
qname = match_strdup(&args[0]);
|
|
if (!qname) {
|
|
printk(KERN_ERR
|
|
"EXT4-fs: not enough memory for "
|
|
"storing quotafile name.\n");
|
|
return 0;
|
|
}
|
|
if (sbi->s_qf_names[qtype] &&
|
|
strcmp(sbi->s_qf_names[qtype], qname)) {
|
|
printk(KERN_ERR
|
|
"EXT4-fs: %s quota file already "
|
|
"specified.\n", QTYPE2NAME(qtype));
|
|
kfree(qname);
|
|
return 0;
|
|
}
|
|
sbi->s_qf_names[qtype] = qname;
|
|
if (strchr(sbi->s_qf_names[qtype], '/')) {
|
|
printk(KERN_ERR
|
|
"EXT4-fs: quotafile must be on "
|
|
"filesystem root.\n");
|
|
kfree(sbi->s_qf_names[qtype]);
|
|
sbi->s_qf_names[qtype] = NULL;
|
|
return 0;
|
|
}
|
|
set_opt(sbi->s_mount_opt, QUOTA);
|
|
break;
|
|
case Opt_offusrjquota:
|
|
qtype = USRQUOTA;
|
|
goto clear_qf_name;
|
|
case Opt_offgrpjquota:
|
|
qtype = GRPQUOTA;
|
|
clear_qf_name:
|
|
if (sb_any_quota_enabled(sb)) {
|
|
printk(KERN_ERR "EXT4-fs: Cannot change "
|
|
"journalled quota options when "
|
|
"quota turned on.\n");
|
|
return 0;
|
|
}
|
|
/*
|
|
* The space will be released later when all options
|
|
* are confirmed to be correct
|
|
*/
|
|
sbi->s_qf_names[qtype] = NULL;
|
|
break;
|
|
case Opt_jqfmt_vfsold:
|
|
sbi->s_jquota_fmt = QFMT_VFS_OLD;
|
|
break;
|
|
case Opt_jqfmt_vfsv0:
|
|
sbi->s_jquota_fmt = QFMT_VFS_V0;
|
|
break;
|
|
case Opt_quota:
|
|
case Opt_usrquota:
|
|
set_opt(sbi->s_mount_opt, QUOTA);
|
|
set_opt(sbi->s_mount_opt, USRQUOTA);
|
|
break;
|
|
case Opt_grpquota:
|
|
set_opt(sbi->s_mount_opt, QUOTA);
|
|
set_opt(sbi->s_mount_opt, GRPQUOTA);
|
|
break;
|
|
case Opt_noquota:
|
|
if (sb_any_quota_enabled(sb)) {
|
|
printk(KERN_ERR "EXT4-fs: Cannot change quota "
|
|
"options when quota turned on.\n");
|
|
return 0;
|
|
}
|
|
clear_opt(sbi->s_mount_opt, QUOTA);
|
|
clear_opt(sbi->s_mount_opt, USRQUOTA);
|
|
clear_opt(sbi->s_mount_opt, GRPQUOTA);
|
|
break;
|
|
#else
|
|
case Opt_quota:
|
|
case Opt_usrquota:
|
|
case Opt_grpquota:
|
|
case Opt_usrjquota:
|
|
case Opt_grpjquota:
|
|
case Opt_offusrjquota:
|
|
case Opt_offgrpjquota:
|
|
case Opt_jqfmt_vfsold:
|
|
case Opt_jqfmt_vfsv0:
|
|
printk(KERN_ERR
|
|
"EXT4-fs: journalled quota options not "
|
|
"supported.\n");
|
|
break;
|
|
case Opt_noquota:
|
|
break;
|
|
#endif
|
|
case Opt_abort:
|
|
set_opt(sbi->s_mount_opt, ABORT);
|
|
break;
|
|
case Opt_barrier:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
if (option)
|
|
set_opt(sbi->s_mount_opt, BARRIER);
|
|
else
|
|
clear_opt(sbi->s_mount_opt, BARRIER);
|
|
break;
|
|
case Opt_ignore:
|
|
break;
|
|
case Opt_resize:
|
|
if (!is_remount) {
|
|
printk("EXT4-fs: resize option only available "
|
|
"for remount\n");
|
|
return 0;
|
|
}
|
|
if (match_int(&args[0], &option) != 0)
|
|
return 0;
|
|
*n_blocks_count = option;
|
|
break;
|
|
case Opt_nobh:
|
|
set_opt(sbi->s_mount_opt, NOBH);
|
|
break;
|
|
case Opt_bh:
|
|
clear_opt(sbi->s_mount_opt, NOBH);
|
|
break;
|
|
case Opt_extents:
|
|
set_opt (sbi->s_mount_opt, EXTENTS);
|
|
break;
|
|
default:
|
|
printk (KERN_ERR
|
|
"EXT4-fs: Unrecognized mount option \"%s\" "
|
|
"or missing value\n", p);
|
|
return 0;
|
|
}
|
|
}
|
|
#ifdef CONFIG_QUOTA
|
|
if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
|
|
if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
|
|
sbi->s_qf_names[USRQUOTA])
|
|
clear_opt(sbi->s_mount_opt, USRQUOTA);
|
|
|
|
if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
|
|
sbi->s_qf_names[GRPQUOTA])
|
|
clear_opt(sbi->s_mount_opt, GRPQUOTA);
|
|
|
|
if ((sbi->s_qf_names[USRQUOTA] &&
|
|
(sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
|
|
(sbi->s_qf_names[GRPQUOTA] &&
|
|
(sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
|
|
printk(KERN_ERR "EXT4-fs: old and new quota "
|
|
"format mixing.\n");
|
|
return 0;
|
|
}
|
|
|
|
if (!sbi->s_jquota_fmt) {
|
|
printk(KERN_ERR "EXT4-fs: journalled quota format "
|
|
"not specified.\n");
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (sbi->s_jquota_fmt) {
|
|
printk(KERN_ERR "EXT4-fs: journalled quota format "
|
|
"specified with no journalling "
|
|
"enabled.\n");
|
|
return 0;
|
|
}
|
|
}
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
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) {
|
|
printk (KERN_ERR "EXT4-fs warning: revision level too high, "
|
|
"forcing read-only mode\n");
|
|
res = MS_RDONLY;
|
|
}
|
|
if (read_only)
|
|
return res;
|
|
if (!(sbi->s_mount_state & EXT4_VALID_FS))
|
|
printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
|
|
"running e2fsck is recommended\n");
|
|
else if ((sbi->s_mount_state & EXT4_ERROR_FS))
|
|
printk (KERN_WARNING
|
|
"EXT4-fs warning: mounting fs with errors, "
|
|
"running e2fsck is recommended\n");
|
|
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))
|
|
printk (KERN_WARNING
|
|
"EXT4-fs warning: maximal mount count reached, "
|
|
"running e2fsck is recommended\n");
|
|
else if (le32_to_cpu(es->s_checkinterval) &&
|
|
(le32_to_cpu(es->s_lastcheck) +
|
|
le32_to_cpu(es->s_checkinterval) <= get_seconds()))
|
|
printk (KERN_WARNING
|
|
"EXT4-fs warning: checktime reached, "
|
|
"running e2fsck is recommended\n");
|
|
#if 0
|
|
/* @@@ We _will_ want to clear the valid bit if we find
|
|
* inconsistencies, to force a fsck at reboot. But for
|
|
* a plain journaled filesystem we can keep it set as
|
|
* valid forever! :)
|
|
*/
|
|
es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
|
|
#endif
|
|
if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
|
|
es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
|
|
es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
|
|
es->s_mtime = cpu_to_le32(get_seconds());
|
|
ext4_update_dynamic_rev(sb);
|
|
EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
|
|
|
ext4_commit_super(sb, es, 1);
|
|
if (test_opt(sb, DEBUG))
|
|
printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
|
|
"bpg=%lu, ipg=%lu, mo=%04lx]\n",
|
|
sb->s_blocksize,
|
|
sbi->s_groups_count,
|
|
EXT4_BLOCKS_PER_GROUP(sb),
|
|
EXT4_INODES_PER_GROUP(sb),
|
|
sbi->s_mount_opt);
|
|
|
|
printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
|
|
if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
printk("external journal on %s\n",
|
|
bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
|
|
} else {
|
|
printk("internal journal\n");
|
|
}
|
|
return res;
|
|
}
|
|
|
|
/* Called at mount-time, super-block is locked */
|
|
static int ext4_check_descriptors (struct super_block * sb)
|
|
{
|
|
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;
|
|
struct ext4_group_desc * gdp = NULL;
|
|
int desc_block = 0;
|
|
int i;
|
|
|
|
ext4_debug ("Checking group descriptors");
|
|
|
|
for (i = 0; i < sbi->s_groups_count; i++)
|
|
{
|
|
if (i == sbi->s_groups_count - 1)
|
|
last_block = ext4_blocks_count(sbi->s_es) - 1;
|
|
else
|
|
last_block = first_block +
|
|
(EXT4_BLOCKS_PER_GROUP(sb) - 1);
|
|
|
|
if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
|
|
gdp = (struct ext4_group_desc *)
|
|
sbi->s_group_desc[desc_block++]->b_data;
|
|
block_bitmap = ext4_block_bitmap(sb, gdp);
|
|
if (block_bitmap < first_block || block_bitmap > last_block)
|
|
{
|
|
ext4_error (sb, "ext4_check_descriptors",
|
|
"Block bitmap for group %d"
|
|
" 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_error (sb, "ext4_check_descriptors",
|
|
"Inode bitmap for group %d"
|
|
" 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 > last_block)
|
|
{
|
|
ext4_error (sb, "ext4_check_descriptors",
|
|
"Inode table for group %d"
|
|
" not in group (block %llu)!",
|
|
i, inode_table);
|
|
return 0;
|
|
}
|
|
first_block += EXT4_BLOCKS_PER_GROUP(sb);
|
|
gdp = (struct ext4_group_desc *)
|
|
((__u8 *)gdp + EXT4_DESC_SIZE(sb));
|
|
}
|
|
|
|
ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(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)) {
|
|
printk(KERN_ERR "EXT4-fs: write access "
|
|
"unavailable, skipping orphan cleanup.\n");
|
|
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) {
|
|
printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
|
|
sb->s_id);
|
|
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)
|
|
printk(KERN_ERR
|
|
"EXT4-fs: Cannot turn on journalled "
|
|
"quota: error %d\n", ret);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
while (es->s_last_orphan) {
|
|
struct inode *inode;
|
|
|
|
if (!(inode =
|
|
ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
|
|
es->s_last_orphan = 0;
|
|
break;
|
|
}
|
|
|
|
list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
|
|
DQUOT_INIT(inode);
|
|
if (inode->i_nlink) {
|
|
printk(KERN_DEBUG
|
|
"%s: truncating inode %lu to %Ld bytes\n",
|
|
__FUNCTION__, inode->i_ino, inode->i_size);
|
|
jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
|
|
inode->i_ino, inode->i_size);
|
|
ext4_truncate(inode);
|
|
nr_truncates++;
|
|
} else {
|
|
printk(KERN_DEBUG
|
|
"%s: deleting unreferenced inode %lu\n",
|
|
__FUNCTION__, 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)
|
|
printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
|
|
sb->s_id, PLURAL(nr_orphans));
|
|
if (nr_truncates)
|
|
printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
|
|
sb->s_id, PLURAL(nr_truncates));
|
|
#ifdef CONFIG_QUOTA
|
|
/* Turn quotas off */
|
|
for (i = 0; i < MAXQUOTAS; i++) {
|
|
if (sb_dqopt(sb)->files[i])
|
|
vfs_quota_off(sb, i);
|
|
}
|
|
#endif
|
|
sb->s_flags = s_flags; /* Restore MS_RDONLY status */
|
|
}
|
|
|
|
#define log2(n) ffz(~(n))
|
|
|
|
/*
|
|
* Maximal file size. There is a direct, and {,double-,triple-}indirect
|
|
* block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
|
|
* We need to be 1 filesystem block less than the 2^32 sector limit.
|
|
*/
|
|
static loff_t ext4_max_size(int bits)
|
|
{
|
|
loff_t res = EXT4_NDIR_BLOCKS;
|
|
/* This constant is calculated to be the largest file size for a
|
|
* dense, 4k-blocksize file such that the total number of
|
|
* sectors in the file, including data and all indirect blocks,
|
|
* does not exceed 2^32. */
|
|
const loff_t upper_limit = 0x1ff7fffd000LL;
|
|
|
|
res += 1LL << (bits-2);
|
|
res += 1LL << (2*(bits-2));
|
|
res += 1LL << (3*(bits-2));
|
|
res <<= bits;
|
|
if (res > upper_limit)
|
|
res = upper_limit;
|
|
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);
|
|
unsigned long 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));
|
|
}
|
|
|
|
|
|
static int ext4_fill_super (struct super_block *sb, void *data, int silent)
|
|
{
|
|
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 int journal_inum = 0;
|
|
unsigned long journal_devnum = 0;
|
|
unsigned long def_mount_opts;
|
|
struct inode *root;
|
|
int blocksize;
|
|
int hblock;
|
|
int db_count;
|
|
int i;
|
|
int needs_recovery;
|
|
__le32 features;
|
|
__u64 blocks_count;
|
|
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
|
if (!sbi)
|
|
return -ENOMEM;
|
|
sb->s_fs_info = sbi;
|
|
sbi->s_mount_opt = 0;
|
|
sbi->s_resuid = EXT4_DEF_RESUID;
|
|
sbi->s_resgid = EXT4_DEF_RESGID;
|
|
|
|
unlock_kernel();
|
|
|
|
blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
|
|
if (!blocksize) {
|
|
printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
|
|
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))) {
|
|
printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
|
|
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;
|
|
|
|
/* Set defaults before we parse the mount options */
|
|
def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
|
|
if (def_mount_opts & EXT4_DEFM_DEBUG)
|
|
set_opt(sbi->s_mount_opt, DEBUG);
|
|
if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
|
|
set_opt(sbi->s_mount_opt, GRPID);
|
|
if (def_mount_opts & EXT4_DEFM_UID16)
|
|
set_opt(sbi->s_mount_opt, NO_UID32);
|
|
#ifdef CONFIG_EXT4DEV_FS_XATTR
|
|
if (def_mount_opts & EXT4_DEFM_XATTR_USER)
|
|
set_opt(sbi->s_mount_opt, XATTR_USER);
|
|
#endif
|
|
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
|
|
if (def_mount_opts & EXT4_DEFM_ACL)
|
|
set_opt(sbi->s_mount_opt, POSIX_ACL);
|
|
#endif
|
|
if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
|
|
sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
|
|
else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
|
|
sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
|
|
else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
|
|
sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
|
|
|
|
if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
|
|
set_opt(sbi->s_mount_opt, ERRORS_PANIC);
|
|
else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
|
|
set_opt(sbi->s_mount_opt, ERRORS_RO);
|
|
else
|
|
set_opt(sbi->s_mount_opt, ERRORS_CONT);
|
|
|
|
sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
|
|
sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
|
|
|
|
set_opt(sbi->s_mount_opt, RESERVATION);
|
|
|
|
if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
|
|
NULL, 0))
|
|
goto failed_mount;
|
|
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
|
((sbi->s_mount_opt & EXT4_MOUNT_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)))
|
|
printk(KERN_WARNING
|
|
"EXT4-fs warning: feature flags set on rev 0 fs, "
|
|
"running e2fsck is recommended\n");
|
|
/*
|
|
* 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.
|
|
*/
|
|
features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
|
|
if (features) {
|
|
printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
|
|
"unsupported optional features (%x).\n",
|
|
sb->s_id, le32_to_cpu(features));
|
|
goto failed_mount;
|
|
}
|
|
features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
|
|
if (!(sb->s_flags & MS_RDONLY) && features) {
|
|
printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
|
|
"unsupported optional features (%x).\n",
|
|
sb->s_id, le32_to_cpu(features));
|
|
goto failed_mount;
|
|
}
|
|
blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
|
|
|
|
if (blocksize < EXT4_MIN_BLOCK_SIZE ||
|
|
blocksize > EXT4_MAX_BLOCK_SIZE) {
|
|
printk(KERN_ERR
|
|
"EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
|
|
blocksize, sb->s_id);
|
|
goto failed_mount;
|
|
}
|
|
|
|
hblock = bdev_hardsect_size(sb->s_bdev);
|
|
if (sb->s_blocksize != blocksize) {
|
|
/*
|
|
* Make sure the blocksize for the filesystem is larger
|
|
* than the hardware sectorsize for the machine.
|
|
*/
|
|
if (blocksize < hblock) {
|
|
printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
|
|
"device blocksize %d.\n", blocksize, hblock);
|
|
goto failed_mount;
|
|
}
|
|
|
|
brelse (bh);
|
|
sb_set_blocksize(sb, blocksize);
|
|
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) {
|
|
printk(KERN_ERR
|
|
"EXT4-fs: Can't read superblock on 2nd try.\n");
|
|
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)) {
|
|
printk (KERN_ERR
|
|
"EXT4-fs: Magic mismatch, very weird !\n");
|
|
goto failed_mount;
|
|
}
|
|
}
|
|
|
|
sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
|
|
|
|
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) ||
|
|
(sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
|
|
(sbi->s_inode_size > blocksize)) {
|
|
printk (KERN_ERR
|
|
"EXT4-fs: unsupported inode size: %d\n",
|
|
sbi->s_inode_size);
|
|
goto failed_mount;
|
|
}
|
|
}
|
|
sbi->s_frag_size = EXT4_MIN_FRAG_SIZE <<
|
|
le32_to_cpu(es->s_log_frag_size);
|
|
if (blocksize != sbi->s_frag_size) {
|
|
printk(KERN_ERR
|
|
"EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n",
|
|
sbi->s_frag_size, blocksize);
|
|
goto failed_mount;
|
|
}
|
|
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 ||
|
|
sbi->s_desc_size & (sbi->s_desc_size - 1)) {
|
|
printk(KERN_ERR
|
|
"EXT4-fs: unsupported descriptor size %lu\n",
|
|
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_frags_per_group = le32_to_cpu(es->s_frags_per_group);
|
|
sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
|
|
if (EXT4_INODE_SIZE(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 = log2(EXT4_ADDR_PER_BLOCK(sb));
|
|
sbi->s_desc_per_block_bits = log2(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;
|
|
|
|
if (sbi->s_blocks_per_group > blocksize * 8) {
|
|
printk (KERN_ERR
|
|
"EXT4-fs: #blocks per group too big: %lu\n",
|
|
sbi->s_blocks_per_group);
|
|
goto failed_mount;
|
|
}
|
|
if (sbi->s_frags_per_group > blocksize * 8) {
|
|
printk (KERN_ERR
|
|
"EXT4-fs: #fragments per group too big: %lu\n",
|
|
sbi->s_frags_per_group);
|
|
goto failed_mount;
|
|
}
|
|
if (sbi->s_inodes_per_group > blocksize * 8) {
|
|
printk (KERN_ERR
|
|
"EXT4-fs: #inodes per group too big: %lu\n",
|
|
sbi->s_inodes_per_group);
|
|
goto failed_mount;
|
|
}
|
|
|
|
if (ext4_blocks_count(es) >
|
|
(sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
|
|
printk(KERN_ERR "EXT4-fs: filesystem on %s:"
|
|
" too large to mount safely\n", sb->s_id);
|
|
if (sizeof(sector_t) < 8)
|
|
printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
|
|
"enabled\n");
|
|
goto failed_mount;
|
|
}
|
|
|
|
if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
|
|
goto cantfind_ext4;
|
|
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));
|
|
sbi->s_groups_count = blocks_count;
|
|
db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
|
|
EXT4_DESC_PER_BLOCK(sb);
|
|
sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
|
|
GFP_KERNEL);
|
|
if (sbi->s_group_desc == NULL) {
|
|
printk (KERN_ERR "EXT4-fs: not enough memory\n");
|
|
goto failed_mount;
|
|
}
|
|
|
|
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]) {
|
|
printk (KERN_ERR "EXT4-fs: "
|
|
"can't read group descriptor %d\n", i);
|
|
db_count = i;
|
|
goto failed_mount2;
|
|
}
|
|
}
|
|
if (!ext4_check_descriptors (sb)) {
|
|
printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
|
|
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);
|
|
|
|
percpu_counter_init(&sbi->s_freeblocks_counter,
|
|
ext4_count_free_blocks(sb));
|
|
percpu_counter_init(&sbi->s_freeinodes_counter,
|
|
ext4_count_free_inodes(sb));
|
|
percpu_counter_init(&sbi->s_dirs_counter,
|
|
ext4_count_dirs(sb));
|
|
|
|
/* per fileystem reservation list head & lock */
|
|
spin_lock_init(&sbi->s_rsv_window_lock);
|
|
sbi->s_rsv_window_root = RB_ROOT;
|
|
/* Add a single, static dummy reservation to the start of the
|
|
* reservation window list --- it gives us a placeholder for
|
|
* append-at-start-of-list which makes the allocation logic
|
|
* _much_ simpler. */
|
|
sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
|
|
sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
|
|
sbi->s_rsv_window_head.rsv_alloc_hit = 0;
|
|
sbi->s_rsv_window_head.rsv_goal_size = 0;
|
|
ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
|
|
|
|
/*
|
|
* set up enough so that it can read an inode
|
|
*/
|
|
sb->s_op = &ext4_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
|
|
INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
|
|
|
|
sb->s_root = NULL;
|
|
|
|
needs_recovery = (es->s_last_orphan != 0 ||
|
|
EXT4_HAS_INCOMPAT_FEATURE(sb,
|
|
EXT4_FEATURE_INCOMPAT_RECOVER));
|
|
|
|
/*
|
|
* 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 (journal_inum) {
|
|
if (ext4_create_journal(sb, es, journal_inum))
|
|
goto failed_mount3;
|
|
} else {
|
|
if (!silent)
|
|
printk (KERN_ERR
|
|
"ext4: No journal on filesystem on %s\n",
|
|
sb->s_id);
|
|
goto failed_mount3;
|
|
}
|
|
|
|
/* 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(sbi->s_mount_opt, ORDERED_DATA);
|
|
else
|
|
set_opt(sbi->s_mount_opt, 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)) {
|
|
printk(KERN_ERR "EXT4-fs: Journal does not support "
|
|
"requested data journaling mode\n");
|
|
goto failed_mount4;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (test_opt(sb, NOBH)) {
|
|
if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
|
|
printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
|
|
"its supported only with writeback mode\n");
|
|
clear_opt(sbi->s_mount_opt, NOBH);
|
|
}
|
|
}
|
|
/*
|
|
* The jbd2_journal_load will have done any necessary log recovery,
|
|
* so we can safely mount the rest of the filesystem now.
|
|
*/
|
|
|
|
root = iget(sb, EXT4_ROOT_INO);
|
|
sb->s_root = d_alloc_root(root);
|
|
if (!sb->s_root) {
|
|
printk(KERN_ERR "EXT4-fs: get root inode failed\n");
|
|
iput(root);
|
|
goto failed_mount4;
|
|
}
|
|
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
|
|
dput(sb->s_root);
|
|
sb->s_root = NULL;
|
|
printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
|
|
goto failed_mount4;
|
|
}
|
|
|
|
ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
|
|
/*
|
|
* akpm: core read_super() calls in here with the superblock locked.
|
|
* That deadlocks, because orphan cleanup needs to lock the superblock
|
|
* in numerous places. Here we just pop the lock - it's relatively
|
|
* harmless, because we are now ready to accept write_super() requests,
|
|
* and aviro says that's the only reason for hanging onto the
|
|
* superblock lock.
|
|
*/
|
|
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)
|
|
printk (KERN_INFO "EXT4-fs: recovery complete.\n");
|
|
ext4_mark_recovery_complete(sb, es);
|
|
printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
|
|
test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
|
|
test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
|
|
"writeback");
|
|
|
|
ext4_ext_init(sb);
|
|
|
|
lock_kernel();
|
|
return 0;
|
|
|
|
cantfind_ext4:
|
|
if (!silent)
|
|
printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
|
|
sb->s_id);
|
|
goto failed_mount;
|
|
|
|
failed_mount4:
|
|
jbd2_journal_destroy(sbi->s_journal);
|
|
failed_mount3:
|
|
percpu_counter_destroy(&sbi->s_freeblocks_counter);
|
|
percpu_counter_destroy(&sbi->s_freeinodes_counter);
|
|
percpu_counter_destroy(&sbi->s_dirs_counter);
|
|
failed_mount2:
|
|
for (i = 0; i < db_count; i++)
|
|
brelse(sbi->s_group_desc[i]);
|
|
kfree(sbi->s_group_desc);
|
|
failed_mount:
|
|
#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);
|
|
lock_kernel();
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
if (sbi->s_commit_interval)
|
|
journal->j_commit_interval = sbi->s_commit_interval;
|
|
/* We could also set up an ext4-specific default for the commit
|
|
* interval here, but for now we'll just fall back to the jbd
|
|
* default. */
|
|
|
|
spin_lock(&journal->j_state_lock);
|
|
if (test_opt(sb, BARRIER))
|
|
journal->j_flags |= JBD2_BARRIER;
|
|
else
|
|
journal->j_flags &= ~JBD2_BARRIER;
|
|
spin_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;
|
|
|
|
/* 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 = iget(sb, journal_inum);
|
|
if (!journal_inode) {
|
|
printk(KERN_ERR "EXT4-fs: no journal found.\n");
|
|
return NULL;
|
|
}
|
|
if (!journal_inode->i_nlink) {
|
|
make_bad_inode(journal_inode);
|
|
iput(journal_inode);
|
|
printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
|
|
return NULL;
|
|
}
|
|
|
|
jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
|
|
journal_inode, journal_inode->i_size);
|
|
if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
|
|
printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
|
|
iput(journal_inode);
|
|
return NULL;
|
|
}
|
|
|
|
journal = jbd2_journal_init_inode(journal_inode);
|
|
if (!journal) {
|
|
printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
|
|
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;
|
|
|
|
bdev = ext4_blkdev_get(j_dev);
|
|
if (bdev == NULL)
|
|
return NULL;
|
|
|
|
if (bd_claim(bdev, sb)) {
|
|
printk(KERN_ERR
|
|
"EXT4: failed to claim external journal device.\n");
|
|
blkdev_put(bdev);
|
|
return NULL;
|
|
}
|
|
|
|
blocksize = sb->s_blocksize;
|
|
hblock = bdev_hardsect_size(bdev);
|
|
if (blocksize < hblock) {
|
|
printk(KERN_ERR
|
|
"EXT4-fs: blocksize too small for journal device.\n");
|
|
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))) {
|
|
printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
|
|
"external journal\n");
|
|
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)) {
|
|
printk(KERN_ERR "EXT4-fs: external journal has "
|
|
"bad superblock\n");
|
|
brelse(bh);
|
|
goto out_bdev;
|
|
}
|
|
|
|
if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
|
|
printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
|
|
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) {
|
|
printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
|
|
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)) {
|
|
printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
|
|
goto out_journal;
|
|
}
|
|
if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
|
|
printk(KERN_ERR "EXT4-fs: External journal has more than one "
|
|
"user (unsupported) - %d\n",
|
|
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;
|
|
|
|
if (journal_devnum &&
|
|
journal_devnum != le32_to_cpu(es->s_journal_dev)) {
|
|
printk(KERN_INFO "EXT4-fs: external journal device major/minor "
|
|
"numbers have changed\n");
|
|
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) {
|
|
printk(KERN_INFO "EXT4-fs: INFO: recovery "
|
|
"required on readonly filesystem.\n");
|
|
if (really_read_only) {
|
|
printk(KERN_ERR "EXT4-fs: write access "
|
|
"unavailable, cannot proceed.\n");
|
|
return -EROFS;
|
|
}
|
|
printk (KERN_INFO "EXT4-fs: write access will "
|
|
"be enabled during recovery.\n");
|
|
}
|
|
}
|
|
|
|
if (journal_inum && journal_dev) {
|
|
printk(KERN_ERR "EXT4-fs: filesystem has both journal "
|
|
"and inode journals!\n");
|
|
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 (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
|
|
err = jbd2_journal_update_format(journal);
|
|
if (err) {
|
|
printk(KERN_ERR "EXT4-fs: error updating journal.\n");
|
|
jbd2_journal_destroy(journal);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
|
|
err = jbd2_journal_wipe(journal, !really_read_only);
|
|
if (!err)
|
|
err = jbd2_journal_load(journal);
|
|
|
|
if (err) {
|
|
printk(KERN_ERR "EXT4-fs: error loading journal.\n");
|
|
jbd2_journal_destroy(journal);
|
|
return err;
|
|
}
|
|
|
|
EXT4_SB(sb)->s_journal = journal;
|
|
ext4_clear_journal_err(sb, es);
|
|
|
|
if (journal_devnum &&
|
|
journal_devnum != le32_to_cpu(es->s_journal_dev)) {
|
|
es->s_journal_dev = cpu_to_le32(journal_devnum);
|
|
sb->s_dirt = 1;
|
|
|
|
/* Make sure we flush the recovery flag to disk. */
|
|
ext4_commit_super(sb, es, 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ext4_create_journal(struct super_block * sb,
|
|
struct ext4_super_block * es,
|
|
unsigned int journal_inum)
|
|
{
|
|
journal_t *journal;
|
|
|
|
if (sb->s_flags & MS_RDONLY) {
|
|
printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
|
|
"create journal.\n");
|
|
return -EROFS;
|
|
}
|
|
|
|
if (!(journal = ext4_get_journal(sb, journal_inum)))
|
|
return -EINVAL;
|
|
|
|
printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
|
|
journal_inum);
|
|
|
|
if (jbd2_journal_create(journal)) {
|
|
printk(KERN_ERR "EXT4-fs: error creating journal.\n");
|
|
jbd2_journal_destroy(journal);
|
|
return -EIO;
|
|
}
|
|
|
|
EXT4_SB(sb)->s_journal = journal;
|
|
|
|
ext4_update_dynamic_rev(sb);
|
|
EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
|
EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
|
|
|
|
es->s_journal_inum = cpu_to_le32(journal_inum);
|
|
sb->s_dirt = 1;
|
|
|
|
/* Make sure we flush the recovery flag to disk. */
|
|
ext4_commit_super(sb, es, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ext4_commit_super (struct super_block * sb,
|
|
struct ext4_super_block * es,
|
|
int sync)
|
|
{
|
|
struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
|
|
|
|
if (!sbh)
|
|
return;
|
|
es->s_wtime = cpu_to_le32(get_seconds());
|
|
ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
|
|
es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
|
|
BUFFER_TRACE(sbh, "marking dirty");
|
|
mark_buffer_dirty(sbh);
|
|
if (sync)
|
|
sync_dirty_buffer(sbh);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
|
|
jbd2_journal_lock_updates(journal);
|
|
jbd2_journal_flush(journal);
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
|
|
sb->s_flags & MS_RDONLY) {
|
|
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
|
sb->s_dirt = 0;
|
|
ext4_commit_super(sb, es, 1);
|
|
}
|
|
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;
|
|
|
|
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, __FUNCTION__, "Filesystem error recorded "
|
|
"from previous mount: %s", errstr);
|
|
ext4_warning(sb, __FUNCTION__, "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, es, 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;
|
|
|
|
if (sb->s_flags & MS_RDONLY)
|
|
return 0;
|
|
|
|
journal = EXT4_SB(sb)->s_journal;
|
|
sb->s_dirt = 0;
|
|
ret = ext4_journal_force_commit(journal);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Ext4 always journals updates to the superblock itself, so we don't
|
|
* have to propagate any other updates to the superblock on disk at this
|
|
* point. Just start an async writeback to get the buffers on their way
|
|
* to the disk.
|
|
*
|
|
* This implicitly triggers the writebehind on sync().
|
|
*/
|
|
|
|
static void ext4_write_super (struct super_block * sb)
|
|
{
|
|
if (mutex_trylock(&sb->s_lock) != 0)
|
|
BUG();
|
|
sb->s_dirt = 0;
|
|
}
|
|
|
|
static int ext4_sync_fs(struct super_block *sb, int wait)
|
|
{
|
|
tid_t target;
|
|
|
|
sb->s_dirt = 0;
|
|
if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
|
|
if (wait)
|
|
jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static void ext4_write_super_lockfs(struct super_block *sb)
|
|
{
|
|
sb->s_dirt = 0;
|
|
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
journal_t *journal = EXT4_SB(sb)->s_journal;
|
|
|
|
/* Now we set up the journal barrier. */
|
|
jbd2_journal_lock_updates(journal);
|
|
jbd2_journal_flush(journal);
|
|
|
|
/* Journal blocked and flushed, clear needs_recovery flag. */
|
|
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
|
ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 void ext4_unlockfs(struct super_block *sb)
|
|
{
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
lock_super(sb);
|
|
/* Reser the needs_recovery flag before the fs is unlocked. */
|
|
EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
|
ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
|
|
unlock_super(sb);
|
|
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
|
|
}
|
|
}
|
|
|
|
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);
|
|
ext4_fsblk_t n_blocks_count = 0;
|
|
unsigned long old_sb_flags;
|
|
struct ext4_mount_options old_opts;
|
|
int err;
|
|
#ifdef CONFIG_QUOTA
|
|
int i;
|
|
#endif
|
|
|
|
/* Store the original options */
|
|
old_sb_flags = sb->s_flags;
|
|
old_opts.s_mount_opt = sbi->s_mount_opt;
|
|
old_opts.s_resuid = sbi->s_resuid;
|
|
old_opts.s_resgid = sbi->s_resgid;
|
|
old_opts.s_commit_interval = sbi->s_commit_interval;
|
|
#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
|
|
|
|
/*
|
|
* Allow the "check" option to be passed as a remount option.
|
|
*/
|
|
if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
|
|
err = -EINVAL;
|
|
goto restore_opts;
|
|
}
|
|
|
|
if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
|
|
ext4_abort(sb, __FUNCTION__, "Abort forced by user");
|
|
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
|
((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
|
|
|
|
es = sbi->s_es;
|
|
|
|
ext4_init_journal_params(sb, sbi->s_journal);
|
|
|
|
if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
|
|
n_blocks_count > ext4_blocks_count(es)) {
|
|
if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
|
|
err = -EROFS;
|
|
goto restore_opts;
|
|
}
|
|
|
|
if (*flags & MS_RDONLY) {
|
|
/*
|
|
* 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);
|
|
|
|
ext4_mark_recovery_complete(sb, es);
|
|
} else {
|
|
__le32 ret;
|
|
if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
|
|
~EXT4_FEATURE_RO_COMPAT_SUPP))) {
|
|
printk(KERN_WARNING "EXT4-fs: %s: couldn't "
|
|
"remount RDWR because of unsupported "
|
|
"optional features (%x).\n",
|
|
sb->s_id, le32_to_cpu(ret));
|
|
err = -EROFS;
|
|
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) {
|
|
printk(KERN_WARNING "EXT4-fs: %s: couldn't "
|
|
"remount RDWR because of unprocessed "
|
|
"orphan inode list. Please "
|
|
"umount/remount instead.\n",
|
|
sb->s_id);
|
|
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.)
|
|
*/
|
|
ext4_clear_journal_err(sb, es);
|
|
sbi->s_mount_state = le16_to_cpu(es->s_state);
|
|
if ((err = ext4_group_extend(sb, es, n_blocks_count)))
|
|
goto restore_opts;
|
|
if (!ext4_setup_super (sb, es, 0))
|
|
sb->s_flags &= ~MS_RDONLY;
|
|
}
|
|
}
|
|
#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
|
|
return 0;
|
|
restore_opts:
|
|
sb->s_flags = old_sb_flags;
|
|
sbi->s_mount_opt = old_opts.s_mount_opt;
|
|
sbi->s_resuid = old_opts.s_resuid;
|
|
sbi->s_resgid = old_opts.s_resgid;
|
|
sbi->s_commit_interval = old_opts.s_commit_interval;
|
|
#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
|
|
return err;
|
|
}
|
|
|
|
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;
|
|
ext4_fsblk_t overhead;
|
|
int i;
|
|
u64 fsid;
|
|
|
|
if (test_opt (sb, MINIX_DF))
|
|
overhead = 0;
|
|
else {
|
|
unsigned long ngroups;
|
|
ngroups = EXT4_SB(sb)->s_groups_count;
|
|
smp_rmb();
|
|
|
|
/*
|
|
* Compute the overhead (FS structures)
|
|
*/
|
|
|
|
/*
|
|
* All of the blocks before first_data_block are
|
|
* overhead
|
|
*/
|
|
overhead = le32_to_cpu(es->s_first_data_block);
|
|
|
|
/*
|
|
* Add the overhead attributed to the superblock and
|
|
* block group descriptors. If the sparse superblocks
|
|
* feature is turned on, then not all groups have this.
|
|
*/
|
|
for (i = 0; i < ngroups; i++) {
|
|
overhead += ext4_bg_has_super(sb, i) +
|
|
ext4_bg_num_gdb(sb, i);
|
|
cond_resched();
|
|
}
|
|
|
|
/*
|
|
* Every block group has an inode bitmap, a block
|
|
* bitmap, and an inode table.
|
|
*/
|
|
overhead += (ngroups * (2 + EXT4_SB(sb)->s_itb_per_group));
|
|
}
|
|
|
|
buf->f_type = EXT4_SUPER_MAGIC;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_blocks = ext4_blocks_count(es) - overhead;
|
|
buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
|
|
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(&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_INIT() down(dqio_mutex)
|
|
* down(dqio_mutex) jbd2_journal_start()
|
|
*
|
|
*/
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
|
|
static inline struct inode *dquot_to_inode(struct dquot *dquot)
|
|
{
|
|
return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
|
|
}
|
|
|
|
static int ext4_dquot_initialize(struct inode *inode, int type)
|
|
{
|
|
handle_t *handle;
|
|
int ret, err;
|
|
|
|
/* We may create quota structure so we need to reserve enough blocks */
|
|
handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
ret = dquot_initialize(inode, type);
|
|
err = ext4_journal_stop(handle);
|
|
if (!ret)
|
|
ret = err;
|
|
return ret;
|
|
}
|
|
|
|
static int ext4_dquot_drop(struct inode *inode)
|
|
{
|
|
handle_t *handle;
|
|
int ret, err;
|
|
|
|
/* We may delete quota structure so we need to reserve enough blocks */
|
|
handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
ret = dquot_drop(inode);
|
|
err = ext4_journal_stop(handle);
|
|
if (!ret)
|
|
ret = err;
|
|
return ret;
|
|
}
|
|
|
|
static int ext4_write_dquot(struct dquot *dquot)
|
|
{
|
|
int ret, err;
|
|
handle_t *handle;
|
|
struct inode *inode;
|
|
|
|
inode = dquot_to_inode(dquot);
|
|
handle = ext4_journal_start(inode,
|
|
EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
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),
|
|
EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
ret = dquot_acquire(dquot);
|
|
err = ext4_journal_stop(handle);
|
|
if (!ret)
|
|
ret = err;
|
|
return ret;
|
|
}
|
|
|
|
static int ext4_release_dquot(struct dquot *dquot)
|
|
{
|
|
int ret, err;
|
|
handle_t *handle;
|
|
|
|
handle = ext4_journal_start(dquot_to_inode(dquot),
|
|
EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
ret = dquot_release(dquot);
|
|
err = ext4_journal_stop(handle);
|
|
if (!ret)
|
|
ret = err;
|
|
return ret;
|
|
}
|
|
|
|
static int ext4_mark_dquot_dirty(struct dquot *dquot)
|
|
{
|
|
/* Are we journalling quotas? */
|
|
if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
|
|
EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
|
|
dquot_mark_dquot_dirty(dquot);
|
|
return ext4_write_dquot(dquot);
|
|
} else {
|
|
return dquot_mark_dquot_dirty(dquot);
|
|
}
|
|
}
|
|
|
|
static int ext4_write_info(struct super_block *sb, int type)
|
|
{
|
|
int ret, err;
|
|
handle_t *handle;
|
|
|
|
/* Data block + inode block */
|
|
handle = ext4_journal_start(sb->s_root->d_inode, 2);
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
ret = dquot_commit_info(sb, type);
|
|
err = ext4_journal_stop(handle);
|
|
if (!ret)
|
|
ret = err;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Turn on quotas during mount time - we need to find
|
|
* the quota file and such...
|
|
*/
|
|
static int ext4_quota_on_mount(struct super_block *sb, int type)
|
|
{
|
|
return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
|
|
EXT4_SB(sb)->s_jquota_fmt, type);
|
|
}
|
|
|
|
/*
|
|
* Standard function to be called on quota_on
|
|
*/
|
|
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
|
|
char *path)
|
|
{
|
|
int err;
|
|
struct nameidata nd;
|
|
|
|
if (!test_opt(sb, QUOTA))
|
|
return -EINVAL;
|
|
/* Not journalling quota? */
|
|
if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
|
|
!EXT4_SB(sb)->s_qf_names[GRPQUOTA])
|
|
return vfs_quota_on(sb, type, format_id, path);
|
|
err = path_lookup(path, LOOKUP_FOLLOW, &nd);
|
|
if (err)
|
|
return err;
|
|
/* Quotafile not on the same filesystem? */
|
|
if (nd.mnt->mnt_sb != sb) {
|
|
path_release(&nd);
|
|
return -EXDEV;
|
|
}
|
|
/* Quotafile not of fs root? */
|
|
if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
|
|
printk(KERN_WARNING
|
|
"EXT4-fs: Quota file not on filesystem root. "
|
|
"Journalled quota will not work.\n");
|
|
path_release(&nd);
|
|
return vfs_quota_on(sb, type, format_id, path);
|
|
}
|
|
|
|
/* Read data from quotafile - avoid pagecache and such because we cannot afford
|
|
* acquiring the locks... As quota files are never truncated and quota code
|
|
* itself serializes the operations (and noone else should touch the files)
|
|
* we don't have to be afraid of races */
|
|
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
|
|
size_t len, loff_t off)
|
|
{
|
|
struct inode *inode = sb_dqopt(sb)->files[type];
|
|
sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
|
|
int err = 0;
|
|
int offset = off & (sb->s_blocksize - 1);
|
|
int tocopy;
|
|
size_t toread;
|
|
struct buffer_head *bh;
|
|
loff_t i_size = i_size_read(inode);
|
|
|
|
if (off > i_size)
|
|
return 0;
|
|
if (off+len > i_size)
|
|
len = i_size-off;
|
|
toread = len;
|
|
while (toread > 0) {
|
|
tocopy = sb->s_blocksize - offset < toread ?
|
|
sb->s_blocksize - offset : toread;
|
|
bh = ext4_bread(NULL, inode, blk, 0, &err);
|
|
if (err)
|
|
return err;
|
|
if (!bh) /* A hole? */
|
|
memset(data, 0, tocopy);
|
|
else
|
|
memcpy(data, bh->b_data+offset, tocopy);
|
|
brelse(bh);
|
|
offset = 0;
|
|
toread -= tocopy;
|
|
data += tocopy;
|
|
blk++;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
/* Write to quotafile (we know the transaction is already started and has
|
|
* enough credits) */
|
|
static ssize_t ext4_quota_write(struct super_block *sb, int type,
|
|
const char *data, size_t len, loff_t off)
|
|
{
|
|
struct inode *inode = sb_dqopt(sb)->files[type];
|
|
sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
|
|
int err = 0;
|
|
int offset = off & (sb->s_blocksize - 1);
|
|
int tocopy;
|
|
int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
|
|
size_t towrite = len;
|
|
struct buffer_head *bh;
|
|
handle_t *handle = journal_current_handle();
|
|
|
|
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
|
|
while (towrite > 0) {
|
|
tocopy = sb->s_blocksize - offset < towrite ?
|
|
sb->s_blocksize - offset : towrite;
|
|
bh = ext4_bread(handle, inode, blk, 1, &err);
|
|
if (!bh)
|
|
goto out;
|
|
if (journal_quota) {
|
|
err = ext4_journal_get_write_access(handle, bh);
|
|
if (err) {
|
|
brelse(bh);
|
|
goto out;
|
|
}
|
|
}
|
|
lock_buffer(bh);
|
|
memcpy(bh->b_data+offset, data, tocopy);
|
|
flush_dcache_page(bh->b_page);
|
|
unlock_buffer(bh);
|
|
if (journal_quota)
|
|
err = ext4_journal_dirty_metadata(handle, bh);
|
|
else {
|
|
/* Always do at least ordered writes for quotas */
|
|
err = ext4_journal_dirty_data(handle, bh);
|
|
mark_buffer_dirty(bh);
|
|
}
|
|
brelse(bh);
|
|
if (err)
|
|
goto out;
|
|
offset = 0;
|
|
towrite -= tocopy;
|
|
data += tocopy;
|
|
blk++;
|
|
}
|
|
out:
|
|
if (len == towrite)
|
|
return err;
|
|
if (inode->i_size < off+len-towrite) {
|
|
i_size_write(inode, off+len-towrite);
|
|
EXT4_I(inode)->i_disksize = inode->i_size;
|
|
}
|
|
inode->i_version++;
|
|
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
mutex_unlock(&inode->i_mutex);
|
|
return len - towrite;
|
|
}
|
|
|
|
#endif
|
|
|
|
static int ext4_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
|
|
}
|
|
|
|
static struct file_system_type ext4dev_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ext4dev",
|
|
.get_sb = ext4_get_sb,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init init_ext4_fs(void)
|
|
{
|
|
int err = init_ext4_xattr();
|
|
if (err)
|
|
return err;
|
|
err = init_inodecache();
|
|
if (err)
|
|
goto out1;
|
|
err = register_filesystem(&ext4dev_fs_type);
|
|
if (err)
|
|
goto out;
|
|
return 0;
|
|
out:
|
|
destroy_inodecache();
|
|
out1:
|
|
exit_ext4_xattr();
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_ext4_fs(void)
|
|
{
|
|
unregister_filesystem(&ext4dev_fs_type);
|
|
destroy_inodecache();
|
|
exit_ext4_xattr();
|
|
}
|
|
|
|
MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
|
|
MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
|
|
MODULE_LICENSE("GPL");
|
|
module_init(init_ext4_fs)
|
|
module_exit(exit_ext4_fs)
|