mirror of https://gitee.com/openkylin/linux.git
2476 lines
67 KiB
C
2476 lines
67 KiB
C
/*
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* linux/fs/ext4/namei.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/namei.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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* Directory entry file type support and forward compatibility hooks
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* for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
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* Hash Tree Directory indexing (c)
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* Daniel Phillips, 2001
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* Hash Tree Directory indexing porting
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* Christopher Li, 2002
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* Hash Tree Directory indexing cleanup
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* Theodore Ts'o, 2002
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*/
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/jbd2.h>
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#include <linux/time.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/quotaops.h>
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#include <linux/buffer_head.h>
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#include <linux/bio.h>
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#include "ext4.h"
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#include "ext4_jbd2.h"
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#include "namei.h"
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#include "xattr.h"
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#include "acl.h"
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/*
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* define how far ahead to read directories while searching them.
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*/
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#define NAMEI_RA_CHUNKS 2
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#define NAMEI_RA_BLOCKS 4
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#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
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#define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
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static struct buffer_head *ext4_append(handle_t *handle,
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struct inode *inode,
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ext4_lblk_t *block, int *err)
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{
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struct buffer_head *bh;
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*block = inode->i_size >> inode->i_sb->s_blocksize_bits;
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bh = ext4_bread(handle, inode, *block, 1, err);
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if (bh) {
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inode->i_size += inode->i_sb->s_blocksize;
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EXT4_I(inode)->i_disksize = inode->i_size;
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*err = ext4_journal_get_write_access(handle, bh);
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if (*err) {
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brelse(bh);
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bh = NULL;
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}
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}
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return bh;
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}
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#ifndef assert
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#define assert(test) J_ASSERT(test)
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#endif
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#ifndef swap
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#define swap(x, y) do { typeof(x) z = x; x = y; y = z; } while (0)
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#endif
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#ifdef DX_DEBUG
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#define dxtrace(command) command
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#else
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#define dxtrace(command)
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#endif
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struct fake_dirent
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{
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__le32 inode;
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__le16 rec_len;
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u8 name_len;
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u8 file_type;
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};
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struct dx_countlimit
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{
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__le16 limit;
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__le16 count;
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};
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struct dx_entry
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{
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__le32 hash;
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__le32 block;
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};
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/*
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* dx_root_info is laid out so that if it should somehow get overlaid by a
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* dirent the two low bits of the hash version will be zero. Therefore, the
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* hash version mod 4 should never be 0. Sincerely, the paranoia department.
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*/
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struct dx_root
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{
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struct fake_dirent dot;
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char dot_name[4];
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struct fake_dirent dotdot;
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char dotdot_name[4];
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struct dx_root_info
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{
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__le32 reserved_zero;
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u8 hash_version;
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u8 info_length; /* 8 */
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u8 indirect_levels;
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u8 unused_flags;
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}
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info;
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struct dx_entry entries[0];
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};
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struct dx_node
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{
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struct fake_dirent fake;
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struct dx_entry entries[0];
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};
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struct dx_frame
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{
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struct buffer_head *bh;
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struct dx_entry *entries;
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struct dx_entry *at;
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};
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struct dx_map_entry
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{
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u32 hash;
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u16 offs;
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u16 size;
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};
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static inline ext4_lblk_t dx_get_block(struct dx_entry *entry);
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static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value);
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static inline unsigned dx_get_hash (struct dx_entry *entry);
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static void dx_set_hash (struct dx_entry *entry, unsigned value);
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static unsigned dx_get_count (struct dx_entry *entries);
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static unsigned dx_get_limit (struct dx_entry *entries);
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static void dx_set_count (struct dx_entry *entries, unsigned value);
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static void dx_set_limit (struct dx_entry *entries, unsigned value);
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static unsigned dx_root_limit (struct inode *dir, unsigned infosize);
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static unsigned dx_node_limit (struct inode *dir);
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static struct dx_frame *dx_probe(struct dentry *dentry,
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struct inode *dir,
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struct dx_hash_info *hinfo,
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struct dx_frame *frame,
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int *err);
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static void dx_release (struct dx_frame *frames);
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static int dx_make_map (struct ext4_dir_entry_2 *de, int size,
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struct dx_hash_info *hinfo, struct dx_map_entry map[]);
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static void dx_sort_map(struct dx_map_entry *map, unsigned count);
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static struct ext4_dir_entry_2 *dx_move_dirents (char *from, char *to,
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struct dx_map_entry *offsets, int count);
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static struct ext4_dir_entry_2* dx_pack_dirents (char *base, int size);
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static void dx_insert_block(struct dx_frame *frame,
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u32 hash, ext4_lblk_t block);
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static int ext4_htree_next_block(struct inode *dir, __u32 hash,
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struct dx_frame *frame,
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struct dx_frame *frames,
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__u32 *start_hash);
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static struct buffer_head * ext4_dx_find_entry(struct dentry *dentry,
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struct ext4_dir_entry_2 **res_dir, int *err);
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static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
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struct inode *inode);
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/*
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* p is at least 6 bytes before the end of page
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*/
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static inline struct ext4_dir_entry_2 *
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ext4_next_entry(struct ext4_dir_entry_2 *p)
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{
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return (struct ext4_dir_entry_2 *)((char *)p +
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ext4_rec_len_from_disk(p->rec_len));
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}
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/*
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* Future: use high four bits of block for coalesce-on-delete flags
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* Mask them off for now.
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*/
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static inline ext4_lblk_t dx_get_block(struct dx_entry *entry)
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{
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return le32_to_cpu(entry->block) & 0x00ffffff;
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}
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static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value)
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{
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entry->block = cpu_to_le32(value);
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}
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static inline unsigned dx_get_hash (struct dx_entry *entry)
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{
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return le32_to_cpu(entry->hash);
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}
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static inline void dx_set_hash (struct dx_entry *entry, unsigned value)
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{
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entry->hash = cpu_to_le32(value);
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}
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static inline unsigned dx_get_count (struct dx_entry *entries)
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{
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return le16_to_cpu(((struct dx_countlimit *) entries)->count);
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}
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static inline unsigned dx_get_limit (struct dx_entry *entries)
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{
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return le16_to_cpu(((struct dx_countlimit *) entries)->limit);
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}
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static inline void dx_set_count (struct dx_entry *entries, unsigned value)
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{
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((struct dx_countlimit *) entries)->count = cpu_to_le16(value);
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}
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static inline void dx_set_limit (struct dx_entry *entries, unsigned value)
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{
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((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
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}
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static inline unsigned dx_root_limit (struct inode *dir, unsigned infosize)
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{
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unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) -
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EXT4_DIR_REC_LEN(2) - infosize;
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return entry_space / sizeof(struct dx_entry);
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}
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static inline unsigned dx_node_limit (struct inode *dir)
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{
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unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0);
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return entry_space / sizeof(struct dx_entry);
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}
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/*
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* Debug
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*/
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#ifdef DX_DEBUG
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static void dx_show_index (char * label, struct dx_entry *entries)
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{
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int i, n = dx_get_count (entries);
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printk("%s index ", label);
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for (i = 0; i < n; i++) {
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printk("%x->%lu ", i? dx_get_hash(entries + i) :
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0, (unsigned long)dx_get_block(entries + i));
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}
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printk("\n");
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}
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struct stats
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{
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unsigned names;
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unsigned space;
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unsigned bcount;
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};
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static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext4_dir_entry_2 *de,
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int size, int show_names)
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{
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unsigned names = 0, space = 0;
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char *base = (char *) de;
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struct dx_hash_info h = *hinfo;
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printk("names: ");
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while ((char *) de < base + size)
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{
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if (de->inode)
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{
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if (show_names)
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{
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int len = de->name_len;
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char *name = de->name;
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while (len--) printk("%c", *name++);
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ext4fs_dirhash(de->name, de->name_len, &h);
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printk(":%x.%u ", h.hash,
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((char *) de - base));
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}
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space += EXT4_DIR_REC_LEN(de->name_len);
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names++;
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}
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de = ext4_next_entry(de);
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}
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printk("(%i)\n", names);
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return (struct stats) { names, space, 1 };
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}
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struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
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struct dx_entry *entries, int levels)
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{
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unsigned blocksize = dir->i_sb->s_blocksize;
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unsigned count = dx_get_count (entries), names = 0, space = 0, i;
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unsigned bcount = 0;
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struct buffer_head *bh;
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int err;
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printk("%i indexed blocks...\n", count);
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for (i = 0; i < count; i++, entries++)
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{
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ext4_lblk_t block = dx_get_block(entries);
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ext4_lblk_t hash = i ? dx_get_hash(entries): 0;
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u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
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struct stats stats;
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printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
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if (!(bh = ext4_bread (NULL,dir, block, 0,&err))) continue;
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stats = levels?
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dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
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dx_show_leaf(hinfo, (struct ext4_dir_entry_2 *) bh->b_data, blocksize, 0);
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names += stats.names;
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space += stats.space;
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bcount += stats.bcount;
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brelse (bh);
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}
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if (bcount)
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printk("%snames %u, fullness %u (%u%%)\n", levels?"":" ",
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names, space/bcount,(space/bcount)*100/blocksize);
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return (struct stats) { names, space, bcount};
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}
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#endif /* DX_DEBUG */
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/*
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* Probe for a directory leaf block to search.
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*
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* dx_probe can return ERR_BAD_DX_DIR, which means there was a format
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* error in the directory index, and the caller should fall back to
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* searching the directory normally. The callers of dx_probe **MUST**
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* check for this error code, and make sure it never gets reflected
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* back to userspace.
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*/
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static struct dx_frame *
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dx_probe(struct dentry *dentry, struct inode *dir,
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struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err)
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{
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unsigned count, indirect;
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struct dx_entry *at, *entries, *p, *q, *m;
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struct dx_root *root;
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struct buffer_head *bh;
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struct dx_frame *frame = frame_in;
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u32 hash;
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frame->bh = NULL;
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if (dentry)
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dir = dentry->d_parent->d_inode;
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if (!(bh = ext4_bread (NULL,dir, 0, 0, err)))
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goto fail;
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root = (struct dx_root *) bh->b_data;
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if (root->info.hash_version != DX_HASH_TEA &&
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root->info.hash_version != DX_HASH_HALF_MD4 &&
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root->info.hash_version != DX_HASH_LEGACY) {
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ext4_warning(dir->i_sb, __func__,
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"Unrecognised inode hash code %d",
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root->info.hash_version);
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brelse(bh);
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*err = ERR_BAD_DX_DIR;
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goto fail;
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}
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hinfo->hash_version = root->info.hash_version;
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hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed;
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if (dentry)
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ext4fs_dirhash(dentry->d_name.name, dentry->d_name.len, hinfo);
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hash = hinfo->hash;
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if (root->info.unused_flags & 1) {
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ext4_warning(dir->i_sb, __func__,
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"Unimplemented inode hash flags: %#06x",
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root->info.unused_flags);
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brelse(bh);
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*err = ERR_BAD_DX_DIR;
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goto fail;
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}
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|
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if ((indirect = root->info.indirect_levels) > 1) {
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ext4_warning(dir->i_sb, __func__,
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"Unimplemented inode hash depth: %#06x",
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root->info.indirect_levels);
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brelse(bh);
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*err = ERR_BAD_DX_DIR;
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goto fail;
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}
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entries = (struct dx_entry *) (((char *)&root->info) +
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root->info.info_length);
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|
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if (dx_get_limit(entries) != dx_root_limit(dir,
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root->info.info_length)) {
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ext4_warning(dir->i_sb, __func__,
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"dx entry: limit != root limit");
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brelse(bh);
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*err = ERR_BAD_DX_DIR;
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goto fail;
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}
|
|
|
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dxtrace (printk("Look up %x", hash));
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while (1)
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{
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count = dx_get_count(entries);
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if (!count || count > dx_get_limit(entries)) {
|
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ext4_warning(dir->i_sb, __func__,
|
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"dx entry: no count or count > limit");
|
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brelse(bh);
|
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*err = ERR_BAD_DX_DIR;
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goto fail2;
|
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}
|
|
|
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p = entries + 1;
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q = entries + count - 1;
|
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while (p <= q)
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{
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m = p + (q - p)/2;
|
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dxtrace(printk("."));
|
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if (dx_get_hash(m) > hash)
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q = m - 1;
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else
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p = m + 1;
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}
|
|
|
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if (0) // linear search cross check
|
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{
|
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unsigned n = count - 1;
|
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at = entries;
|
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while (n--)
|
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{
|
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dxtrace(printk(","));
|
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if (dx_get_hash(++at) > hash)
|
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{
|
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at--;
|
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break;
|
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}
|
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}
|
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assert (at == p - 1);
|
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}
|
|
|
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at = p - 1;
|
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dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at)));
|
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frame->bh = bh;
|
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frame->entries = entries;
|
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frame->at = at;
|
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if (!indirect--) return frame;
|
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if (!(bh = ext4_bread (NULL,dir, dx_get_block(at), 0, err)))
|
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goto fail2;
|
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at = entries = ((struct dx_node *) bh->b_data)->entries;
|
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if (dx_get_limit(entries) != dx_node_limit (dir)) {
|
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ext4_warning(dir->i_sb, __func__,
|
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"dx entry: limit != node limit");
|
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brelse(bh);
|
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*err = ERR_BAD_DX_DIR;
|
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goto fail2;
|
|
}
|
|
frame++;
|
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frame->bh = NULL;
|
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}
|
|
fail2:
|
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while (frame >= frame_in) {
|
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brelse(frame->bh);
|
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frame--;
|
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}
|
|
fail:
|
|
if (*err == ERR_BAD_DX_DIR)
|
|
ext4_warning(dir->i_sb, __func__,
|
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"Corrupt dir inode %ld, running e2fsck is "
|
|
"recommended.", dir->i_ino);
|
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return NULL;
|
|
}
|
|
|
|
static void dx_release (struct dx_frame *frames)
|
|
{
|
|
if (frames[0].bh == NULL)
|
|
return;
|
|
|
|
if (((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels)
|
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brelse(frames[1].bh);
|
|
brelse(frames[0].bh);
|
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}
|
|
|
|
/*
|
|
* This function increments the frame pointer to search the next leaf
|
|
* block, and reads in the necessary intervening nodes if the search
|
|
* should be necessary. Whether or not the search is necessary is
|
|
* controlled by the hash parameter. If the hash value is even, then
|
|
* the search is only continued if the next block starts with that
|
|
* hash value. This is used if we are searching for a specific file.
|
|
*
|
|
* If the hash value is HASH_NB_ALWAYS, then always go to the next block.
|
|
*
|
|
* This function returns 1 if the caller should continue to search,
|
|
* or 0 if it should not. If there is an error reading one of the
|
|
* index blocks, it will a negative error code.
|
|
*
|
|
* If start_hash is non-null, it will be filled in with the starting
|
|
* hash of the next page.
|
|
*/
|
|
static int ext4_htree_next_block(struct inode *dir, __u32 hash,
|
|
struct dx_frame *frame,
|
|
struct dx_frame *frames,
|
|
__u32 *start_hash)
|
|
{
|
|
struct dx_frame *p;
|
|
struct buffer_head *bh;
|
|
int err, num_frames = 0;
|
|
__u32 bhash;
|
|
|
|
p = frame;
|
|
/*
|
|
* Find the next leaf page by incrementing the frame pointer.
|
|
* If we run out of entries in the interior node, loop around and
|
|
* increment pointer in the parent node. When we break out of
|
|
* this loop, num_frames indicates the number of interior
|
|
* nodes need to be read.
|
|
*/
|
|
while (1) {
|
|
if (++(p->at) < p->entries + dx_get_count(p->entries))
|
|
break;
|
|
if (p == frames)
|
|
return 0;
|
|
num_frames++;
|
|
p--;
|
|
}
|
|
|
|
/*
|
|
* If the hash is 1, then continue only if the next page has a
|
|
* continuation hash of any value. This is used for readdir
|
|
* handling. Otherwise, check to see if the hash matches the
|
|
* desired contiuation hash. If it doesn't, return since
|
|
* there's no point to read in the successive index pages.
|
|
*/
|
|
bhash = dx_get_hash(p->at);
|
|
if (start_hash)
|
|
*start_hash = bhash;
|
|
if ((hash & 1) == 0) {
|
|
if ((bhash & ~1) != hash)
|
|
return 0;
|
|
}
|
|
/*
|
|
* If the hash is HASH_NB_ALWAYS, we always go to the next
|
|
* block so no check is necessary
|
|
*/
|
|
while (num_frames--) {
|
|
if (!(bh = ext4_bread(NULL, dir, dx_get_block(p->at),
|
|
0, &err)))
|
|
return err; /* Failure */
|
|
p++;
|
|
brelse (p->bh);
|
|
p->bh = bh;
|
|
p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* This function fills a red-black tree with information from a
|
|
* directory block. It returns the number directory entries loaded
|
|
* into the tree. If there is an error it is returned in err.
|
|
*/
|
|
static int htree_dirblock_to_tree(struct file *dir_file,
|
|
struct inode *dir, ext4_lblk_t block,
|
|
struct dx_hash_info *hinfo,
|
|
__u32 start_hash, __u32 start_minor_hash)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct ext4_dir_entry_2 *de, *top;
|
|
int err, count = 0;
|
|
|
|
dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
|
|
(unsigned long)block));
|
|
if (!(bh = ext4_bread (NULL, dir, block, 0, &err)))
|
|
return err;
|
|
|
|
de = (struct ext4_dir_entry_2 *) bh->b_data;
|
|
top = (struct ext4_dir_entry_2 *) ((char *) de +
|
|
dir->i_sb->s_blocksize -
|
|
EXT4_DIR_REC_LEN(0));
|
|
for (; de < top; de = ext4_next_entry(de)) {
|
|
if (!ext4_check_dir_entry("htree_dirblock_to_tree", dir, de, bh,
|
|
(block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb))
|
|
+((char *)de - bh->b_data))) {
|
|
/* On error, skip the f_pos to the next block. */
|
|
dir_file->f_pos = (dir_file->f_pos |
|
|
(dir->i_sb->s_blocksize - 1)) + 1;
|
|
brelse (bh);
|
|
return count;
|
|
}
|
|
ext4fs_dirhash(de->name, de->name_len, hinfo);
|
|
if ((hinfo->hash < start_hash) ||
|
|
((hinfo->hash == start_hash) &&
|
|
(hinfo->minor_hash < start_minor_hash)))
|
|
continue;
|
|
if (de->inode == 0)
|
|
continue;
|
|
if ((err = ext4_htree_store_dirent(dir_file,
|
|
hinfo->hash, hinfo->minor_hash, de)) != 0) {
|
|
brelse(bh);
|
|
return err;
|
|
}
|
|
count++;
|
|
}
|
|
brelse(bh);
|
|
return count;
|
|
}
|
|
|
|
|
|
/*
|
|
* This function fills a red-black tree with information from a
|
|
* directory. We start scanning the directory in hash order, starting
|
|
* at start_hash and start_minor_hash.
|
|
*
|
|
* This function returns the number of entries inserted into the tree,
|
|
* or a negative error code.
|
|
*/
|
|
int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
|
|
__u32 start_minor_hash, __u32 *next_hash)
|
|
{
|
|
struct dx_hash_info hinfo;
|
|
struct ext4_dir_entry_2 *de;
|
|
struct dx_frame frames[2], *frame;
|
|
struct inode *dir;
|
|
ext4_lblk_t block;
|
|
int count = 0;
|
|
int ret, err;
|
|
__u32 hashval;
|
|
|
|
dxtrace(printk("In htree_fill_tree, start hash: %x:%x\n", start_hash,
|
|
start_minor_hash));
|
|
dir = dir_file->f_path.dentry->d_inode;
|
|
if (!(EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) {
|
|
hinfo.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
|
|
hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
|
|
count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
|
|
start_hash, start_minor_hash);
|
|
*next_hash = ~0;
|
|
return count;
|
|
}
|
|
hinfo.hash = start_hash;
|
|
hinfo.minor_hash = 0;
|
|
frame = dx_probe(NULL, dir_file->f_path.dentry->d_inode, &hinfo, frames, &err);
|
|
if (!frame)
|
|
return err;
|
|
|
|
/* Add '.' and '..' from the htree header */
|
|
if (!start_hash && !start_minor_hash) {
|
|
de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
|
|
if ((err = ext4_htree_store_dirent(dir_file, 0, 0, de)) != 0)
|
|
goto errout;
|
|
count++;
|
|
}
|
|
if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
|
|
de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
|
|
de = ext4_next_entry(de);
|
|
if ((err = ext4_htree_store_dirent(dir_file, 2, 0, de)) != 0)
|
|
goto errout;
|
|
count++;
|
|
}
|
|
|
|
while (1) {
|
|
block = dx_get_block(frame->at);
|
|
ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
|
|
start_hash, start_minor_hash);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto errout;
|
|
}
|
|
count += ret;
|
|
hashval = ~0;
|
|
ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS,
|
|
frame, frames, &hashval);
|
|
*next_hash = hashval;
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto errout;
|
|
}
|
|
/*
|
|
* Stop if: (a) there are no more entries, or
|
|
* (b) we have inserted at least one entry and the
|
|
* next hash value is not a continuation
|
|
*/
|
|
if ((ret == 0) ||
|
|
(count && ((hashval & 1) == 0)))
|
|
break;
|
|
}
|
|
dx_release(frames);
|
|
dxtrace(printk("Fill tree: returned %d entries, next hash: %x\n",
|
|
count, *next_hash));
|
|
return count;
|
|
errout:
|
|
dx_release(frames);
|
|
return (err);
|
|
}
|
|
|
|
|
|
/*
|
|
* Directory block splitting, compacting
|
|
*/
|
|
|
|
/*
|
|
* Create map of hash values, offsets, and sizes, stored at end of block.
|
|
* Returns number of entries mapped.
|
|
*/
|
|
static int dx_make_map (struct ext4_dir_entry_2 *de, int size,
|
|
struct dx_hash_info *hinfo, struct dx_map_entry *map_tail)
|
|
{
|
|
int count = 0;
|
|
char *base = (char *) de;
|
|
struct dx_hash_info h = *hinfo;
|
|
|
|
while ((char *) de < base + size)
|
|
{
|
|
if (de->name_len && de->inode) {
|
|
ext4fs_dirhash(de->name, de->name_len, &h);
|
|
map_tail--;
|
|
map_tail->hash = h.hash;
|
|
map_tail->offs = (u16) ((char *) de - base);
|
|
map_tail->size = le16_to_cpu(de->rec_len);
|
|
count++;
|
|
cond_resched();
|
|
}
|
|
/* XXX: do we need to check rec_len == 0 case? -Chris */
|
|
de = ext4_next_entry(de);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/* Sort map by hash value */
|
|
static void dx_sort_map (struct dx_map_entry *map, unsigned count)
|
|
{
|
|
struct dx_map_entry *p, *q, *top = map + count - 1;
|
|
int more;
|
|
/* Combsort until bubble sort doesn't suck */
|
|
while (count > 2) {
|
|
count = count*10/13;
|
|
if (count - 9 < 2) /* 9, 10 -> 11 */
|
|
count = 11;
|
|
for (p = top, q = p - count; q >= map; p--, q--)
|
|
if (p->hash < q->hash)
|
|
swap(*p, *q);
|
|
}
|
|
/* Garden variety bubble sort */
|
|
do {
|
|
more = 0;
|
|
q = top;
|
|
while (q-- > map) {
|
|
if (q[1].hash >= q[0].hash)
|
|
continue;
|
|
swap(*(q+1), *q);
|
|
more = 1;
|
|
}
|
|
} while(more);
|
|
}
|
|
|
|
static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block)
|
|
{
|
|
struct dx_entry *entries = frame->entries;
|
|
struct dx_entry *old = frame->at, *new = old + 1;
|
|
int count = dx_get_count(entries);
|
|
|
|
assert(count < dx_get_limit(entries));
|
|
assert(old < entries + count);
|
|
memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
|
|
dx_set_hash(new, hash);
|
|
dx_set_block(new, block);
|
|
dx_set_count(entries, count + 1);
|
|
}
|
|
|
|
static void ext4_update_dx_flag(struct inode *inode)
|
|
{
|
|
if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
|
|
EXT4_FEATURE_COMPAT_DIR_INDEX))
|
|
EXT4_I(inode)->i_flags &= ~EXT4_INDEX_FL;
|
|
}
|
|
|
|
/*
|
|
* NOTE! unlike strncmp, ext4_match returns 1 for success, 0 for failure.
|
|
*
|
|
* `len <= EXT4_NAME_LEN' is guaranteed by caller.
|
|
* `de != NULL' is guaranteed by caller.
|
|
*/
|
|
static inline int ext4_match (int len, const char * const name,
|
|
struct ext4_dir_entry_2 * de)
|
|
{
|
|
if (len != de->name_len)
|
|
return 0;
|
|
if (!de->inode)
|
|
return 0;
|
|
return !memcmp(name, de->name, len);
|
|
}
|
|
|
|
/*
|
|
* Returns 0 if not found, -1 on failure, and 1 on success
|
|
*/
|
|
static inline int search_dirblock(struct buffer_head * bh,
|
|
struct inode *dir,
|
|
struct dentry *dentry,
|
|
unsigned long offset,
|
|
struct ext4_dir_entry_2 ** res_dir)
|
|
{
|
|
struct ext4_dir_entry_2 * de;
|
|
char * dlimit;
|
|
int de_len;
|
|
const char *name = dentry->d_name.name;
|
|
int namelen = dentry->d_name.len;
|
|
|
|
de = (struct ext4_dir_entry_2 *) bh->b_data;
|
|
dlimit = bh->b_data + dir->i_sb->s_blocksize;
|
|
while ((char *) de < dlimit) {
|
|
/* this code is executed quadratically often */
|
|
/* do minimal checking `by hand' */
|
|
|
|
if ((char *) de + namelen <= dlimit &&
|
|
ext4_match (namelen, name, de)) {
|
|
/* found a match - just to be sure, do a full check */
|
|
if (!ext4_check_dir_entry("ext4_find_entry",
|
|
dir, de, bh, offset))
|
|
return -1;
|
|
*res_dir = de;
|
|
return 1;
|
|
}
|
|
/* prevent looping on a bad block */
|
|
de_len = ext4_rec_len_from_disk(de->rec_len);
|
|
if (de_len <= 0)
|
|
return -1;
|
|
offset += de_len;
|
|
de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* ext4_find_entry()
|
|
*
|
|
* finds an entry in the specified directory with the wanted name. It
|
|
* returns the cache buffer in which the entry was found, and the entry
|
|
* itself (as a parameter - res_dir). It does NOT read the inode of the
|
|
* entry - you'll have to do that yourself if you want to.
|
|
*
|
|
* The returned buffer_head has ->b_count elevated. The caller is expected
|
|
* to brelse() it when appropriate.
|
|
*/
|
|
static struct buffer_head * ext4_find_entry (struct dentry *dentry,
|
|
struct ext4_dir_entry_2 ** res_dir)
|
|
{
|
|
struct super_block * sb;
|
|
struct buffer_head * bh_use[NAMEI_RA_SIZE];
|
|
struct buffer_head * bh, *ret = NULL;
|
|
ext4_lblk_t start, block, b;
|
|
int ra_max = 0; /* Number of bh's in the readahead
|
|
buffer, bh_use[] */
|
|
int ra_ptr = 0; /* Current index into readahead
|
|
buffer */
|
|
int num = 0;
|
|
ext4_lblk_t nblocks;
|
|
int i, err;
|
|
struct inode *dir = dentry->d_parent->d_inode;
|
|
int namelen;
|
|
|
|
*res_dir = NULL;
|
|
sb = dir->i_sb;
|
|
namelen = dentry->d_name.len;
|
|
if (namelen > EXT4_NAME_LEN)
|
|
return NULL;
|
|
if (is_dx(dir)) {
|
|
bh = ext4_dx_find_entry(dentry, res_dir, &err);
|
|
/*
|
|
* On success, or if the error was file not found,
|
|
* return. Otherwise, fall back to doing a search the
|
|
* old fashioned way.
|
|
*/
|
|
if (bh || (err != ERR_BAD_DX_DIR))
|
|
return bh;
|
|
dxtrace(printk("ext4_find_entry: dx failed, falling back\n"));
|
|
}
|
|
nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
|
|
start = EXT4_I(dir)->i_dir_start_lookup;
|
|
if (start >= nblocks)
|
|
start = 0;
|
|
block = start;
|
|
restart:
|
|
do {
|
|
/*
|
|
* We deal with the read-ahead logic here.
|
|
*/
|
|
if (ra_ptr >= ra_max) {
|
|
/* Refill the readahead buffer */
|
|
ra_ptr = 0;
|
|
b = block;
|
|
for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
|
|
/*
|
|
* Terminate if we reach the end of the
|
|
* directory and must wrap, or if our
|
|
* search has finished at this block.
|
|
*/
|
|
if (b >= nblocks || (num && block == start)) {
|
|
bh_use[ra_max] = NULL;
|
|
break;
|
|
}
|
|
num++;
|
|
bh = ext4_getblk(NULL, dir, b++, 0, &err);
|
|
bh_use[ra_max] = bh;
|
|
if (bh)
|
|
ll_rw_block(READ_META, 1, &bh);
|
|
}
|
|
}
|
|
if ((bh = bh_use[ra_ptr++]) == NULL)
|
|
goto next;
|
|
wait_on_buffer(bh);
|
|
if (!buffer_uptodate(bh)) {
|
|
/* read error, skip block & hope for the best */
|
|
ext4_error(sb, __func__, "reading directory #%lu "
|
|
"offset %lu", dir->i_ino,
|
|
(unsigned long)block);
|
|
brelse(bh);
|
|
goto next;
|
|
}
|
|
i = search_dirblock(bh, dir, dentry,
|
|
block << EXT4_BLOCK_SIZE_BITS(sb), res_dir);
|
|
if (i == 1) {
|
|
EXT4_I(dir)->i_dir_start_lookup = block;
|
|
ret = bh;
|
|
goto cleanup_and_exit;
|
|
} else {
|
|
brelse(bh);
|
|
if (i < 0)
|
|
goto cleanup_and_exit;
|
|
}
|
|
next:
|
|
if (++block >= nblocks)
|
|
block = 0;
|
|
} while (block != start);
|
|
|
|
/*
|
|
* If the directory has grown while we were searching, then
|
|
* search the last part of the directory before giving up.
|
|
*/
|
|
block = nblocks;
|
|
nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
|
|
if (block < nblocks) {
|
|
start = 0;
|
|
goto restart;
|
|
}
|
|
|
|
cleanup_and_exit:
|
|
/* Clean up the read-ahead blocks */
|
|
for (; ra_ptr < ra_max; ra_ptr++)
|
|
brelse (bh_use[ra_ptr]);
|
|
return ret;
|
|
}
|
|
|
|
static struct buffer_head * ext4_dx_find_entry(struct dentry *dentry,
|
|
struct ext4_dir_entry_2 **res_dir, int *err)
|
|
{
|
|
struct super_block * sb;
|
|
struct dx_hash_info hinfo;
|
|
u32 hash;
|
|
struct dx_frame frames[2], *frame;
|
|
struct ext4_dir_entry_2 *de, *top;
|
|
struct buffer_head *bh;
|
|
ext4_lblk_t block;
|
|
int retval;
|
|
int namelen = dentry->d_name.len;
|
|
const u8 *name = dentry->d_name.name;
|
|
struct inode *dir = dentry->d_parent->d_inode;
|
|
|
|
sb = dir->i_sb;
|
|
/* NFS may look up ".." - look at dx_root directory block */
|
|
if (namelen > 2 || name[0] != '.'||(name[1] != '.' && name[1] != '\0')){
|
|
if (!(frame = dx_probe(dentry, NULL, &hinfo, frames, err)))
|
|
return NULL;
|
|
} else {
|
|
frame = frames;
|
|
frame->bh = NULL; /* for dx_release() */
|
|
frame->at = (struct dx_entry *)frames; /* hack for zero entry*/
|
|
dx_set_block(frame->at, 0); /* dx_root block is 0 */
|
|
}
|
|
hash = hinfo.hash;
|
|
do {
|
|
block = dx_get_block(frame->at);
|
|
if (!(bh = ext4_bread (NULL,dir, block, 0, err)))
|
|
goto errout;
|
|
de = (struct ext4_dir_entry_2 *) bh->b_data;
|
|
top = (struct ext4_dir_entry_2 *) ((char *) de + sb->s_blocksize -
|
|
EXT4_DIR_REC_LEN(0));
|
|
for (; de < top; de = ext4_next_entry(de)) {
|
|
int off = (block << EXT4_BLOCK_SIZE_BITS(sb))
|
|
+ ((char *) de - bh->b_data);
|
|
|
|
if (!ext4_check_dir_entry(__func__, dir, de, bh, off)) {
|
|
brelse(bh);
|
|
*err = ERR_BAD_DX_DIR;
|
|
goto errout;
|
|
}
|
|
|
|
if (ext4_match(namelen, name, de)) {
|
|
*res_dir = de;
|
|
dx_release(frames);
|
|
return bh;
|
|
}
|
|
}
|
|
brelse (bh);
|
|
/* Check to see if we should continue to search */
|
|
retval = ext4_htree_next_block(dir, hash, frame,
|
|
frames, NULL);
|
|
if (retval < 0) {
|
|
ext4_warning(sb, __func__,
|
|
"error reading index page in directory #%lu",
|
|
dir->i_ino);
|
|
*err = retval;
|
|
goto errout;
|
|
}
|
|
} while (retval == 1);
|
|
|
|
*err = -ENOENT;
|
|
errout:
|
|
dxtrace(printk("%s not found\n", name));
|
|
dx_release (frames);
|
|
return NULL;
|
|
}
|
|
|
|
static struct dentry *ext4_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct inode * inode;
|
|
struct ext4_dir_entry_2 * de;
|
|
struct buffer_head * bh;
|
|
|
|
if (dentry->d_name.len > EXT4_NAME_LEN)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
bh = ext4_find_entry(dentry, &de);
|
|
inode = NULL;
|
|
if (bh) {
|
|
unsigned long ino = le32_to_cpu(de->inode);
|
|
brelse (bh);
|
|
if (!ext4_valid_inum(dir->i_sb, ino)) {
|
|
ext4_error(dir->i_sb, "ext4_lookup",
|
|
"bad inode number: %lu", ino);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
inode = ext4_iget(dir->i_sb, ino);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
}
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
|
|
struct dentry *ext4_get_parent(struct dentry *child)
|
|
{
|
|
unsigned long ino;
|
|
struct dentry *parent;
|
|
struct inode *inode;
|
|
struct dentry dotdot;
|
|
struct ext4_dir_entry_2 * de;
|
|
struct buffer_head *bh;
|
|
|
|
dotdot.d_name.name = "..";
|
|
dotdot.d_name.len = 2;
|
|
dotdot.d_parent = child; /* confusing, isn't it! */
|
|
|
|
bh = ext4_find_entry(&dotdot, &de);
|
|
inode = NULL;
|
|
if (!bh)
|
|
return ERR_PTR(-ENOENT);
|
|
ino = le32_to_cpu(de->inode);
|
|
brelse(bh);
|
|
|
|
if (!ext4_valid_inum(child->d_inode->i_sb, ino)) {
|
|
ext4_error(child->d_inode->i_sb, "ext4_get_parent",
|
|
"bad inode number: %lu", ino);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
|
|
inode = ext4_iget(child->d_inode->i_sb, ino);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
|
|
parent = d_alloc_anon(inode);
|
|
if (!parent) {
|
|
iput(inode);
|
|
parent = ERR_PTR(-ENOMEM);
|
|
}
|
|
return parent;
|
|
}
|
|
|
|
#define S_SHIFT 12
|
|
static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
|
|
[S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
|
|
[S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
|
|
[S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
|
|
[S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
|
|
[S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
|
|
[S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
|
|
[S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
|
|
};
|
|
|
|
static inline void ext4_set_de_type(struct super_block *sb,
|
|
struct ext4_dir_entry_2 *de,
|
|
umode_t mode) {
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
|
|
de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
|
|
}
|
|
|
|
/*
|
|
* Move count entries from end of map between two memory locations.
|
|
* Returns pointer to last entry moved.
|
|
*/
|
|
static struct ext4_dir_entry_2 *
|
|
dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count)
|
|
{
|
|
unsigned rec_len = 0;
|
|
|
|
while (count--) {
|
|
struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) (from + map->offs);
|
|
rec_len = EXT4_DIR_REC_LEN(de->name_len);
|
|
memcpy (to, de, rec_len);
|
|
((struct ext4_dir_entry_2 *) to)->rec_len =
|
|
ext4_rec_len_to_disk(rec_len);
|
|
de->inode = 0;
|
|
map++;
|
|
to += rec_len;
|
|
}
|
|
return (struct ext4_dir_entry_2 *) (to - rec_len);
|
|
}
|
|
|
|
/*
|
|
* Compact each dir entry in the range to the minimal rec_len.
|
|
* Returns pointer to last entry in range.
|
|
*/
|
|
static struct ext4_dir_entry_2* dx_pack_dirents(char *base, int size)
|
|
{
|
|
struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base;
|
|
unsigned rec_len = 0;
|
|
|
|
prev = to = de;
|
|
while ((char*)de < base + size) {
|
|
next = ext4_next_entry(de);
|
|
if (de->inode && de->name_len) {
|
|
rec_len = EXT4_DIR_REC_LEN(de->name_len);
|
|
if (de > to)
|
|
memmove(to, de, rec_len);
|
|
to->rec_len = ext4_rec_len_to_disk(rec_len);
|
|
prev = to;
|
|
to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len);
|
|
}
|
|
de = next;
|
|
}
|
|
return prev;
|
|
}
|
|
|
|
/*
|
|
* Split a full leaf block to make room for a new dir entry.
|
|
* Allocate a new block, and move entries so that they are approx. equally full.
|
|
* Returns pointer to de in block into which the new entry will be inserted.
|
|
*/
|
|
static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
|
|
struct buffer_head **bh,struct dx_frame *frame,
|
|
struct dx_hash_info *hinfo, int *error)
|
|
{
|
|
unsigned blocksize = dir->i_sb->s_blocksize;
|
|
unsigned count, continued;
|
|
struct buffer_head *bh2;
|
|
ext4_lblk_t newblock;
|
|
u32 hash2;
|
|
struct dx_map_entry *map;
|
|
char *data1 = (*bh)->b_data, *data2;
|
|
unsigned split, move, size, i;
|
|
struct ext4_dir_entry_2 *de = NULL, *de2;
|
|
int err = 0;
|
|
|
|
bh2 = ext4_append (handle, dir, &newblock, &err);
|
|
if (!(bh2)) {
|
|
brelse(*bh);
|
|
*bh = NULL;
|
|
goto errout;
|
|
}
|
|
|
|
BUFFER_TRACE(*bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, *bh);
|
|
if (err)
|
|
goto journal_error;
|
|
|
|
BUFFER_TRACE(frame->bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, frame->bh);
|
|
if (err)
|
|
goto journal_error;
|
|
|
|
data2 = bh2->b_data;
|
|
|
|
/* create map in the end of data2 block */
|
|
map = (struct dx_map_entry *) (data2 + blocksize);
|
|
count = dx_make_map ((struct ext4_dir_entry_2 *) data1,
|
|
blocksize, hinfo, map);
|
|
map -= count;
|
|
dx_sort_map (map, count);
|
|
/* Split the existing block in the middle, size-wise */
|
|
size = 0;
|
|
move = 0;
|
|
for (i = count-1; i >= 0; i--) {
|
|
/* is more than half of this entry in 2nd half of the block? */
|
|
if (size + map[i].size/2 > blocksize/2)
|
|
break;
|
|
size += map[i].size;
|
|
move++;
|
|
}
|
|
/* map index at which we will split */
|
|
split = count - move;
|
|
hash2 = map[split].hash;
|
|
continued = hash2 == map[split - 1].hash;
|
|
dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n",
|
|
(unsigned long)dx_get_block(frame->at),
|
|
hash2, split, count-split));
|
|
|
|
/* Fancy dance to stay within two buffers */
|
|
de2 = dx_move_dirents(data1, data2, map + split, count - split);
|
|
de = dx_pack_dirents(data1,blocksize);
|
|
de->rec_len = ext4_rec_len_to_disk(data1 + blocksize - (char *) de);
|
|
de2->rec_len = ext4_rec_len_to_disk(data2 + blocksize - (char *) de2);
|
|
dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data1, blocksize, 1));
|
|
dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data2, blocksize, 1));
|
|
|
|
/* Which block gets the new entry? */
|
|
if (hinfo->hash >= hash2)
|
|
{
|
|
swap(*bh, bh2);
|
|
de = de2;
|
|
}
|
|
dx_insert_block (frame, hash2 + continued, newblock);
|
|
err = ext4_journal_dirty_metadata (handle, bh2);
|
|
if (err)
|
|
goto journal_error;
|
|
err = ext4_journal_dirty_metadata (handle, frame->bh);
|
|
if (err)
|
|
goto journal_error;
|
|
brelse (bh2);
|
|
dxtrace(dx_show_index ("frame", frame->entries));
|
|
return de;
|
|
|
|
journal_error:
|
|
brelse(*bh);
|
|
brelse(bh2);
|
|
*bh = NULL;
|
|
ext4_std_error(dir->i_sb, err);
|
|
errout:
|
|
*error = err;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Add a new entry into a directory (leaf) block. If de is non-NULL,
|
|
* it points to a directory entry which is guaranteed to be large
|
|
* enough for new directory entry. If de is NULL, then
|
|
* add_dirent_to_buf will attempt search the directory block for
|
|
* space. It will return -ENOSPC if no space is available, and -EIO
|
|
* and -EEXIST if directory entry already exists.
|
|
*
|
|
* NOTE! bh is NOT released in the case where ENOSPC is returned. In
|
|
* all other cases bh is released.
|
|
*/
|
|
static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
|
|
struct inode *inode, struct ext4_dir_entry_2 *de,
|
|
struct buffer_head * bh)
|
|
{
|
|
struct inode *dir = dentry->d_parent->d_inode;
|
|
const char *name = dentry->d_name.name;
|
|
int namelen = dentry->d_name.len;
|
|
unsigned long offset = 0;
|
|
unsigned short reclen;
|
|
int nlen, rlen, err;
|
|
char *top;
|
|
|
|
reclen = EXT4_DIR_REC_LEN(namelen);
|
|
if (!de) {
|
|
de = (struct ext4_dir_entry_2 *)bh->b_data;
|
|
top = bh->b_data + dir->i_sb->s_blocksize - reclen;
|
|
while ((char *) de <= top) {
|
|
if (!ext4_check_dir_entry("ext4_add_entry", dir, de,
|
|
bh, offset)) {
|
|
brelse (bh);
|
|
return -EIO;
|
|
}
|
|
if (ext4_match (namelen, name, de)) {
|
|
brelse (bh);
|
|
return -EEXIST;
|
|
}
|
|
nlen = EXT4_DIR_REC_LEN(de->name_len);
|
|
rlen = ext4_rec_len_from_disk(de->rec_len);
|
|
if ((de->inode? rlen - nlen: rlen) >= reclen)
|
|
break;
|
|
de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
|
|
offset += rlen;
|
|
}
|
|
if ((char *) de > top)
|
|
return -ENOSPC;
|
|
}
|
|
BUFFER_TRACE(bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, bh);
|
|
if (err) {
|
|
ext4_std_error(dir->i_sb, err);
|
|
brelse(bh);
|
|
return err;
|
|
}
|
|
|
|
/* By now the buffer is marked for journaling */
|
|
nlen = EXT4_DIR_REC_LEN(de->name_len);
|
|
rlen = ext4_rec_len_from_disk(de->rec_len);
|
|
if (de->inode) {
|
|
struct ext4_dir_entry_2 *de1 = (struct ext4_dir_entry_2 *)((char *)de + nlen);
|
|
de1->rec_len = ext4_rec_len_to_disk(rlen - nlen);
|
|
de->rec_len = ext4_rec_len_to_disk(nlen);
|
|
de = de1;
|
|
}
|
|
de->file_type = EXT4_FT_UNKNOWN;
|
|
if (inode) {
|
|
de->inode = cpu_to_le32(inode->i_ino);
|
|
ext4_set_de_type(dir->i_sb, de, inode->i_mode);
|
|
} else
|
|
de->inode = 0;
|
|
de->name_len = namelen;
|
|
memcpy (de->name, name, namelen);
|
|
/*
|
|
* XXX shouldn't update any times until successful
|
|
* completion of syscall, but too many callers depend
|
|
* on this.
|
|
*
|
|
* XXX similarly, too many callers depend on
|
|
* ext4_new_inode() setting the times, but error
|
|
* recovery deletes the inode, so the worst that can
|
|
* happen is that the times are slightly out of date
|
|
* and/or different from the directory change time.
|
|
*/
|
|
dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
|
|
ext4_update_dx_flag(dir);
|
|
dir->i_version++;
|
|
ext4_mark_inode_dirty(handle, dir);
|
|
BUFFER_TRACE(bh, "call ext4_journal_dirty_metadata");
|
|
err = ext4_journal_dirty_metadata(handle, bh);
|
|
if (err)
|
|
ext4_std_error(dir->i_sb, err);
|
|
brelse(bh);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This converts a one block unindexed directory to a 3 block indexed
|
|
* directory, and adds the dentry to the indexed directory.
|
|
*/
|
|
static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
|
|
struct inode *inode, struct buffer_head *bh)
|
|
{
|
|
struct inode *dir = dentry->d_parent->d_inode;
|
|
const char *name = dentry->d_name.name;
|
|
int namelen = dentry->d_name.len;
|
|
struct buffer_head *bh2;
|
|
struct dx_root *root;
|
|
struct dx_frame frames[2], *frame;
|
|
struct dx_entry *entries;
|
|
struct ext4_dir_entry_2 *de, *de2;
|
|
char *data1, *top;
|
|
unsigned len;
|
|
int retval;
|
|
unsigned blocksize;
|
|
struct dx_hash_info hinfo;
|
|
ext4_lblk_t block;
|
|
struct fake_dirent *fde;
|
|
|
|
blocksize = dir->i_sb->s_blocksize;
|
|
dxtrace(printk("Creating index\n"));
|
|
retval = ext4_journal_get_write_access(handle, bh);
|
|
if (retval) {
|
|
ext4_std_error(dir->i_sb, retval);
|
|
brelse(bh);
|
|
return retval;
|
|
}
|
|
root = (struct dx_root *) bh->b_data;
|
|
|
|
bh2 = ext4_append (handle, dir, &block, &retval);
|
|
if (!(bh2)) {
|
|
brelse(bh);
|
|
return retval;
|
|
}
|
|
EXT4_I(dir)->i_flags |= EXT4_INDEX_FL;
|
|
data1 = bh2->b_data;
|
|
|
|
/* The 0th block becomes the root, move the dirents out */
|
|
fde = &root->dotdot;
|
|
de = (struct ext4_dir_entry_2 *)((char *)fde +
|
|
ext4_rec_len_from_disk(fde->rec_len));
|
|
len = ((char *) root) + blocksize - (char *) de;
|
|
memcpy (data1, de, len);
|
|
de = (struct ext4_dir_entry_2 *) data1;
|
|
top = data1 + len;
|
|
while ((char *)(de2 = ext4_next_entry(de)) < top)
|
|
de = de2;
|
|
de->rec_len = ext4_rec_len_to_disk(data1 + blocksize - (char *) de);
|
|
/* Initialize the root; the dot dirents already exist */
|
|
de = (struct ext4_dir_entry_2 *) (&root->dotdot);
|
|
de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2));
|
|
memset (&root->info, 0, sizeof(root->info));
|
|
root->info.info_length = sizeof(root->info);
|
|
root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
|
|
entries = root->entries;
|
|
dx_set_block (entries, 1);
|
|
dx_set_count (entries, 1);
|
|
dx_set_limit (entries, dx_root_limit(dir, sizeof(root->info)));
|
|
|
|
/* Initialize as for dx_probe */
|
|
hinfo.hash_version = root->info.hash_version;
|
|
hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
|
|
ext4fs_dirhash(name, namelen, &hinfo);
|
|
frame = frames;
|
|
frame->entries = entries;
|
|
frame->at = entries;
|
|
frame->bh = bh;
|
|
bh = bh2;
|
|
de = do_split(handle,dir, &bh, frame, &hinfo, &retval);
|
|
dx_release (frames);
|
|
if (!(de))
|
|
return retval;
|
|
|
|
return add_dirent_to_buf(handle, dentry, inode, de, bh);
|
|
}
|
|
|
|
/*
|
|
* ext4_add_entry()
|
|
*
|
|
* adds a file entry to the specified directory, using the same
|
|
* semantics as ext4_find_entry(). It returns NULL if it failed.
|
|
*
|
|
* NOTE!! The inode part of 'de' is left at 0 - which means you
|
|
* may not sleep between calling this and putting something into
|
|
* the entry, as someone else might have used it while you slept.
|
|
*/
|
|
static int ext4_add_entry (handle_t *handle, struct dentry *dentry,
|
|
struct inode *inode)
|
|
{
|
|
struct inode *dir = dentry->d_parent->d_inode;
|
|
unsigned long offset;
|
|
struct buffer_head * bh;
|
|
struct ext4_dir_entry_2 *de;
|
|
struct super_block * sb;
|
|
int retval;
|
|
int dx_fallback=0;
|
|
unsigned blocksize;
|
|
ext4_lblk_t block, blocks;
|
|
|
|
sb = dir->i_sb;
|
|
blocksize = sb->s_blocksize;
|
|
if (!dentry->d_name.len)
|
|
return -EINVAL;
|
|
if (is_dx(dir)) {
|
|
retval = ext4_dx_add_entry(handle, dentry, inode);
|
|
if (!retval || (retval != ERR_BAD_DX_DIR))
|
|
return retval;
|
|
EXT4_I(dir)->i_flags &= ~EXT4_INDEX_FL;
|
|
dx_fallback++;
|
|
ext4_mark_inode_dirty(handle, dir);
|
|
}
|
|
blocks = dir->i_size >> sb->s_blocksize_bits;
|
|
for (block = 0, offset = 0; block < blocks; block++) {
|
|
bh = ext4_bread(handle, dir, block, 0, &retval);
|
|
if(!bh)
|
|
return retval;
|
|
retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
|
|
if (retval != -ENOSPC)
|
|
return retval;
|
|
|
|
if (blocks == 1 && !dx_fallback &&
|
|
EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX))
|
|
return make_indexed_dir(handle, dentry, inode, bh);
|
|
brelse(bh);
|
|
}
|
|
bh = ext4_append(handle, dir, &block, &retval);
|
|
if (!bh)
|
|
return retval;
|
|
de = (struct ext4_dir_entry_2 *) bh->b_data;
|
|
de->inode = 0;
|
|
de->rec_len = ext4_rec_len_to_disk(blocksize);
|
|
return add_dirent_to_buf(handle, dentry, inode, de, bh);
|
|
}
|
|
|
|
/*
|
|
* Returns 0 for success, or a negative error value
|
|
*/
|
|
static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
|
|
struct inode *inode)
|
|
{
|
|
struct dx_frame frames[2], *frame;
|
|
struct dx_entry *entries, *at;
|
|
struct dx_hash_info hinfo;
|
|
struct buffer_head * bh;
|
|
struct inode *dir = dentry->d_parent->d_inode;
|
|
struct super_block * sb = dir->i_sb;
|
|
struct ext4_dir_entry_2 *de;
|
|
int err;
|
|
|
|
frame = dx_probe(dentry, NULL, &hinfo, frames, &err);
|
|
if (!frame)
|
|
return err;
|
|
entries = frame->entries;
|
|
at = frame->at;
|
|
|
|
if (!(bh = ext4_bread(handle,dir, dx_get_block(frame->at), 0, &err)))
|
|
goto cleanup;
|
|
|
|
BUFFER_TRACE(bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, bh);
|
|
if (err)
|
|
goto journal_error;
|
|
|
|
err = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
|
|
if (err != -ENOSPC) {
|
|
bh = NULL;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Block full, should compress but for now just split */
|
|
dxtrace(printk("using %u of %u node entries\n",
|
|
dx_get_count(entries), dx_get_limit(entries)));
|
|
/* Need to split index? */
|
|
if (dx_get_count(entries) == dx_get_limit(entries)) {
|
|
ext4_lblk_t newblock;
|
|
unsigned icount = dx_get_count(entries);
|
|
int levels = frame - frames;
|
|
struct dx_entry *entries2;
|
|
struct dx_node *node2;
|
|
struct buffer_head *bh2;
|
|
|
|
if (levels && (dx_get_count(frames->entries) ==
|
|
dx_get_limit(frames->entries))) {
|
|
ext4_warning(sb, __func__,
|
|
"Directory index full!");
|
|
err = -ENOSPC;
|
|
goto cleanup;
|
|
}
|
|
bh2 = ext4_append (handle, dir, &newblock, &err);
|
|
if (!(bh2))
|
|
goto cleanup;
|
|
node2 = (struct dx_node *)(bh2->b_data);
|
|
entries2 = node2->entries;
|
|
node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize);
|
|
node2->fake.inode = 0;
|
|
BUFFER_TRACE(frame->bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, frame->bh);
|
|
if (err)
|
|
goto journal_error;
|
|
if (levels) {
|
|
unsigned icount1 = icount/2, icount2 = icount - icount1;
|
|
unsigned hash2 = dx_get_hash(entries + icount1);
|
|
dxtrace(printk("Split index %i/%i\n", icount1, icount2));
|
|
|
|
BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */
|
|
err = ext4_journal_get_write_access(handle,
|
|
frames[0].bh);
|
|
if (err)
|
|
goto journal_error;
|
|
|
|
memcpy ((char *) entries2, (char *) (entries + icount1),
|
|
icount2 * sizeof(struct dx_entry));
|
|
dx_set_count (entries, icount1);
|
|
dx_set_count (entries2, icount2);
|
|
dx_set_limit (entries2, dx_node_limit(dir));
|
|
|
|
/* Which index block gets the new entry? */
|
|
if (at - entries >= icount1) {
|
|
frame->at = at = at - entries - icount1 + entries2;
|
|
frame->entries = entries = entries2;
|
|
swap(frame->bh, bh2);
|
|
}
|
|
dx_insert_block (frames + 0, hash2, newblock);
|
|
dxtrace(dx_show_index ("node", frames[1].entries));
|
|
dxtrace(dx_show_index ("node",
|
|
((struct dx_node *) bh2->b_data)->entries));
|
|
err = ext4_journal_dirty_metadata(handle, bh2);
|
|
if (err)
|
|
goto journal_error;
|
|
brelse (bh2);
|
|
} else {
|
|
dxtrace(printk("Creating second level index...\n"));
|
|
memcpy((char *) entries2, (char *) entries,
|
|
icount * sizeof(struct dx_entry));
|
|
dx_set_limit(entries2, dx_node_limit(dir));
|
|
|
|
/* Set up root */
|
|
dx_set_count(entries, 1);
|
|
dx_set_block(entries + 0, newblock);
|
|
((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1;
|
|
|
|
/* Add new access path frame */
|
|
frame = frames + 1;
|
|
frame->at = at = at - entries + entries2;
|
|
frame->entries = entries = entries2;
|
|
frame->bh = bh2;
|
|
err = ext4_journal_get_write_access(handle,
|
|
frame->bh);
|
|
if (err)
|
|
goto journal_error;
|
|
}
|
|
ext4_journal_dirty_metadata(handle, frames[0].bh);
|
|
}
|
|
de = do_split(handle, dir, &bh, frame, &hinfo, &err);
|
|
if (!de)
|
|
goto cleanup;
|
|
err = add_dirent_to_buf(handle, dentry, inode, de, bh);
|
|
bh = NULL;
|
|
goto cleanup;
|
|
|
|
journal_error:
|
|
ext4_std_error(dir->i_sb, err);
|
|
cleanup:
|
|
if (bh)
|
|
brelse(bh);
|
|
dx_release(frames);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ext4_delete_entry deletes a directory entry by merging it with the
|
|
* previous entry
|
|
*/
|
|
static int ext4_delete_entry (handle_t *handle,
|
|
struct inode * dir,
|
|
struct ext4_dir_entry_2 * de_del,
|
|
struct buffer_head * bh)
|
|
{
|
|
struct ext4_dir_entry_2 * de, * pde;
|
|
int i;
|
|
|
|
i = 0;
|
|
pde = NULL;
|
|
de = (struct ext4_dir_entry_2 *) bh->b_data;
|
|
while (i < bh->b_size) {
|
|
if (!ext4_check_dir_entry("ext4_delete_entry", dir, de, bh, i))
|
|
return -EIO;
|
|
if (de == de_del) {
|
|
BUFFER_TRACE(bh, "get_write_access");
|
|
ext4_journal_get_write_access(handle, bh);
|
|
if (pde)
|
|
pde->rec_len = ext4_rec_len_to_disk(
|
|
ext4_rec_len_from_disk(pde->rec_len) +
|
|
ext4_rec_len_from_disk(de->rec_len));
|
|
else
|
|
de->inode = 0;
|
|
dir->i_version++;
|
|
BUFFER_TRACE(bh, "call ext4_journal_dirty_metadata");
|
|
ext4_journal_dirty_metadata(handle, bh);
|
|
return 0;
|
|
}
|
|
i += ext4_rec_len_from_disk(de->rec_len);
|
|
pde = de;
|
|
de = ext4_next_entry(de);
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
/*
|
|
* DIR_NLINK feature is set if 1) nlinks > EXT4_LINK_MAX or 2) nlinks == 2,
|
|
* since this indicates that nlinks count was previously 1.
|
|
*/
|
|
static void ext4_inc_count(handle_t *handle, struct inode *inode)
|
|
{
|
|
inc_nlink(inode);
|
|
if (is_dx(inode) && inode->i_nlink > 1) {
|
|
/* limit is 16-bit i_links_count */
|
|
if (inode->i_nlink >= EXT4_LINK_MAX || inode->i_nlink == 2) {
|
|
inode->i_nlink = 1;
|
|
EXT4_SET_RO_COMPAT_FEATURE(inode->i_sb,
|
|
EXT4_FEATURE_RO_COMPAT_DIR_NLINK);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If a directory had nlink == 1, then we should let it be 1. This indicates
|
|
* directory has >EXT4_LINK_MAX subdirs.
|
|
*/
|
|
static void ext4_dec_count(handle_t *handle, struct inode *inode)
|
|
{
|
|
drop_nlink(inode);
|
|
if (S_ISDIR(inode->i_mode) && inode->i_nlink == 0)
|
|
inc_nlink(inode);
|
|
}
|
|
|
|
|
|
static int ext4_add_nondir(handle_t *handle,
|
|
struct dentry *dentry, struct inode *inode)
|
|
{
|
|
int err = ext4_add_entry(handle, dentry, inode);
|
|
if (!err) {
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
}
|
|
drop_nlink(inode);
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* By the time this is called, we already have created
|
|
* the directory cache entry for the new file, but it
|
|
* is so far negative - it has no inode.
|
|
*
|
|
* If the create succeeds, we fill in the inode information
|
|
* with d_instantiate().
|
|
*/
|
|
static int ext4_create (struct inode * dir, struct dentry * dentry, int mode,
|
|
struct nameidata *nd)
|
|
{
|
|
handle_t *handle;
|
|
struct inode * inode;
|
|
int err, retries = 0;
|
|
|
|
retry:
|
|
handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
|
|
2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
handle->h_sync = 1;
|
|
|
|
inode = ext4_new_inode (handle, dir, mode);
|
|
err = PTR_ERR(inode);
|
|
if (!IS_ERR(inode)) {
|
|
inode->i_op = &ext4_file_inode_operations;
|
|
inode->i_fop = &ext4_file_operations;
|
|
ext4_set_aops(inode);
|
|
err = ext4_add_nondir(handle, dentry, inode);
|
|
}
|
|
ext4_journal_stop(handle);
|
|
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
|
|
goto retry;
|
|
return err;
|
|
}
|
|
|
|
static int ext4_mknod (struct inode * dir, struct dentry *dentry,
|
|
int mode, dev_t rdev)
|
|
{
|
|
handle_t *handle;
|
|
struct inode *inode;
|
|
int err, retries = 0;
|
|
|
|
if (!new_valid_dev(rdev))
|
|
return -EINVAL;
|
|
|
|
retry:
|
|
handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
|
|
2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
handle->h_sync = 1;
|
|
|
|
inode = ext4_new_inode (handle, dir, mode);
|
|
err = PTR_ERR(inode);
|
|
if (!IS_ERR(inode)) {
|
|
init_special_inode(inode, inode->i_mode, rdev);
|
|
#ifdef CONFIG_EXT4DEV_FS_XATTR
|
|
inode->i_op = &ext4_special_inode_operations;
|
|
#endif
|
|
err = ext4_add_nondir(handle, dentry, inode);
|
|
}
|
|
ext4_journal_stop(handle);
|
|
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
|
|
goto retry;
|
|
return err;
|
|
}
|
|
|
|
static int ext4_mkdir(struct inode * dir, struct dentry * dentry, int mode)
|
|
{
|
|
handle_t *handle;
|
|
struct inode * inode;
|
|
struct buffer_head * dir_block;
|
|
struct ext4_dir_entry_2 * de;
|
|
int err, retries = 0;
|
|
|
|
if (EXT4_DIR_LINK_MAX(dir))
|
|
return -EMLINK;
|
|
|
|
retry:
|
|
handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
|
|
2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
handle->h_sync = 1;
|
|
|
|
inode = ext4_new_inode (handle, dir, S_IFDIR | mode);
|
|
err = PTR_ERR(inode);
|
|
if (IS_ERR(inode))
|
|
goto out_stop;
|
|
|
|
inode->i_op = &ext4_dir_inode_operations;
|
|
inode->i_fop = &ext4_dir_operations;
|
|
inode->i_size = EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
|
|
dir_block = ext4_bread (handle, inode, 0, 1, &err);
|
|
if (!dir_block)
|
|
goto out_clear_inode;
|
|
BUFFER_TRACE(dir_block, "get_write_access");
|
|
ext4_journal_get_write_access(handle, dir_block);
|
|
de = (struct ext4_dir_entry_2 *) dir_block->b_data;
|
|
de->inode = cpu_to_le32(inode->i_ino);
|
|
de->name_len = 1;
|
|
de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len));
|
|
strcpy (de->name, ".");
|
|
ext4_set_de_type(dir->i_sb, de, S_IFDIR);
|
|
de = ext4_next_entry(de);
|
|
de->inode = cpu_to_le32(dir->i_ino);
|
|
de->rec_len = ext4_rec_len_to_disk(inode->i_sb->s_blocksize -
|
|
EXT4_DIR_REC_LEN(1));
|
|
de->name_len = 2;
|
|
strcpy (de->name, "..");
|
|
ext4_set_de_type(dir->i_sb, de, S_IFDIR);
|
|
inode->i_nlink = 2;
|
|
BUFFER_TRACE(dir_block, "call ext4_journal_dirty_metadata");
|
|
ext4_journal_dirty_metadata(handle, dir_block);
|
|
brelse (dir_block);
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
err = ext4_add_entry (handle, dentry, inode);
|
|
if (err) {
|
|
out_clear_inode:
|
|
clear_nlink(inode);
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
iput (inode);
|
|
goto out_stop;
|
|
}
|
|
ext4_inc_count(handle, dir);
|
|
ext4_update_dx_flag(dir);
|
|
ext4_mark_inode_dirty(handle, dir);
|
|
d_instantiate(dentry, inode);
|
|
out_stop:
|
|
ext4_journal_stop(handle);
|
|
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
|
|
goto retry;
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* routine to check that the specified directory is empty (for rmdir)
|
|
*/
|
|
static int empty_dir (struct inode * inode)
|
|
{
|
|
unsigned long offset;
|
|
struct buffer_head * bh;
|
|
struct ext4_dir_entry_2 * de, * de1;
|
|
struct super_block * sb;
|
|
int err = 0;
|
|
|
|
sb = inode->i_sb;
|
|
if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2) ||
|
|
!(bh = ext4_bread (NULL, inode, 0, 0, &err))) {
|
|
if (err)
|
|
ext4_error(inode->i_sb, __func__,
|
|
"error %d reading directory #%lu offset 0",
|
|
err, inode->i_ino);
|
|
else
|
|
ext4_warning(inode->i_sb, __func__,
|
|
"bad directory (dir #%lu) - no data block",
|
|
inode->i_ino);
|
|
return 1;
|
|
}
|
|
de = (struct ext4_dir_entry_2 *) bh->b_data;
|
|
de1 = ext4_next_entry(de);
|
|
if (le32_to_cpu(de->inode) != inode->i_ino ||
|
|
!le32_to_cpu(de1->inode) ||
|
|
strcmp (".", de->name) ||
|
|
strcmp ("..", de1->name)) {
|
|
ext4_warning (inode->i_sb, "empty_dir",
|
|
"bad directory (dir #%lu) - no `.' or `..'",
|
|
inode->i_ino);
|
|
brelse (bh);
|
|
return 1;
|
|
}
|
|
offset = ext4_rec_len_from_disk(de->rec_len) +
|
|
ext4_rec_len_from_disk(de1->rec_len);
|
|
de = ext4_next_entry(de1);
|
|
while (offset < inode->i_size ) {
|
|
if (!bh ||
|
|
(void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
|
|
err = 0;
|
|
brelse (bh);
|
|
bh = ext4_bread (NULL, inode,
|
|
offset >> EXT4_BLOCK_SIZE_BITS(sb), 0, &err);
|
|
if (!bh) {
|
|
if (err)
|
|
ext4_error(sb, __func__,
|
|
"error %d reading directory"
|
|
" #%lu offset %lu",
|
|
err, inode->i_ino, offset);
|
|
offset += sb->s_blocksize;
|
|
continue;
|
|
}
|
|
de = (struct ext4_dir_entry_2 *) bh->b_data;
|
|
}
|
|
if (!ext4_check_dir_entry("empty_dir", inode, de, bh, offset)) {
|
|
de = (struct ext4_dir_entry_2 *)(bh->b_data +
|
|
sb->s_blocksize);
|
|
offset = (offset | (sb->s_blocksize - 1)) + 1;
|
|
continue;
|
|
}
|
|
if (le32_to_cpu(de->inode)) {
|
|
brelse (bh);
|
|
return 0;
|
|
}
|
|
offset += ext4_rec_len_from_disk(de->rec_len);
|
|
de = ext4_next_entry(de);
|
|
}
|
|
brelse (bh);
|
|
return 1;
|
|
}
|
|
|
|
/* ext4_orphan_add() links an unlinked or truncated inode into a list of
|
|
* such inodes, starting at the superblock, in case we crash before the
|
|
* file is closed/deleted, or in case the inode truncate spans multiple
|
|
* transactions and the last transaction is not recovered after a crash.
|
|
*
|
|
* At filesystem recovery time, we walk this list deleting unlinked
|
|
* inodes and truncating linked inodes in ext4_orphan_cleanup().
|
|
*/
|
|
int ext4_orphan_add(handle_t *handle, struct inode *inode)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct ext4_iloc iloc;
|
|
int err = 0, rc;
|
|
|
|
lock_super(sb);
|
|
if (!list_empty(&EXT4_I(inode)->i_orphan))
|
|
goto out_unlock;
|
|
|
|
/* Orphan handling is only valid for files with data blocks
|
|
* being truncated, or files being unlinked. */
|
|
|
|
/* @@@ FIXME: Observation from aviro:
|
|
* I think I can trigger J_ASSERT in ext4_orphan_add(). We block
|
|
* here (on lock_super()), so race with ext4_link() which might bump
|
|
* ->i_nlink. For, say it, character device. Not a regular file,
|
|
* not a directory, not a symlink and ->i_nlink > 0.
|
|
*/
|
|
J_ASSERT ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
|
|
S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
|
|
|
|
BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
|
|
if (err)
|
|
goto out_unlock;
|
|
|
|
err = ext4_reserve_inode_write(handle, inode, &iloc);
|
|
if (err)
|
|
goto out_unlock;
|
|
|
|
/* Insert this inode at the head of the on-disk orphan list... */
|
|
NEXT_ORPHAN(inode) = le32_to_cpu(EXT4_SB(sb)->s_es->s_last_orphan);
|
|
EXT4_SB(sb)->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
|
|
err = ext4_journal_dirty_metadata(handle, EXT4_SB(sb)->s_sbh);
|
|
rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
|
|
if (!err)
|
|
err = rc;
|
|
|
|
/* Only add to the head of the in-memory list if all the
|
|
* previous operations succeeded. If the orphan_add is going to
|
|
* fail (possibly taking the journal offline), we can't risk
|
|
* leaving the inode on the orphan list: stray orphan-list
|
|
* entries can cause panics at unmount time.
|
|
*
|
|
* This is safe: on error we're going to ignore the orphan list
|
|
* anyway on the next recovery. */
|
|
if (!err)
|
|
list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
|
|
|
|
jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
|
|
jbd_debug(4, "orphan inode %lu will point to %d\n",
|
|
inode->i_ino, NEXT_ORPHAN(inode));
|
|
out_unlock:
|
|
unlock_super(sb);
|
|
ext4_std_error(inode->i_sb, err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ext4_orphan_del() removes an unlinked or truncated inode from the list
|
|
* of such inodes stored on disk, because it is finally being cleaned up.
|
|
*/
|
|
int ext4_orphan_del(handle_t *handle, struct inode *inode)
|
|
{
|
|
struct list_head *prev;
|
|
struct ext4_inode_info *ei = EXT4_I(inode);
|
|
struct ext4_sb_info *sbi;
|
|
unsigned long ino_next;
|
|
struct ext4_iloc iloc;
|
|
int err = 0;
|
|
|
|
lock_super(inode->i_sb);
|
|
if (list_empty(&ei->i_orphan)) {
|
|
unlock_super(inode->i_sb);
|
|
return 0;
|
|
}
|
|
|
|
ino_next = NEXT_ORPHAN(inode);
|
|
prev = ei->i_orphan.prev;
|
|
sbi = EXT4_SB(inode->i_sb);
|
|
|
|
jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);
|
|
|
|
list_del_init(&ei->i_orphan);
|
|
|
|
/* If we're on an error path, we may not have a valid
|
|
* transaction handle with which to update the orphan list on
|
|
* disk, but we still need to remove the inode from the linked
|
|
* list in memory. */
|
|
if (!handle)
|
|
goto out;
|
|
|
|
err = ext4_reserve_inode_write(handle, inode, &iloc);
|
|
if (err)
|
|
goto out_err;
|
|
|
|
if (prev == &sbi->s_orphan) {
|
|
jbd_debug(4, "superblock will point to %lu\n", ino_next);
|
|
BUFFER_TRACE(sbi->s_sbh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, sbi->s_sbh);
|
|
if (err)
|
|
goto out_brelse;
|
|
sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
|
|
err = ext4_journal_dirty_metadata(handle, sbi->s_sbh);
|
|
} else {
|
|
struct ext4_iloc iloc2;
|
|
struct inode *i_prev =
|
|
&list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode;
|
|
|
|
jbd_debug(4, "orphan inode %lu will point to %lu\n",
|
|
i_prev->i_ino, ino_next);
|
|
err = ext4_reserve_inode_write(handle, i_prev, &iloc2);
|
|
if (err)
|
|
goto out_brelse;
|
|
NEXT_ORPHAN(i_prev) = ino_next;
|
|
err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2);
|
|
}
|
|
if (err)
|
|
goto out_brelse;
|
|
NEXT_ORPHAN(inode) = 0;
|
|
err = ext4_mark_iloc_dirty(handle, inode, &iloc);
|
|
|
|
out_err:
|
|
ext4_std_error(inode->i_sb, err);
|
|
out:
|
|
unlock_super(inode->i_sb);
|
|
return err;
|
|
|
|
out_brelse:
|
|
brelse(iloc.bh);
|
|
goto out_err;
|
|
}
|
|
|
|
static int ext4_rmdir (struct inode * dir, struct dentry *dentry)
|
|
{
|
|
int retval;
|
|
struct inode * inode;
|
|
struct buffer_head * bh;
|
|
struct ext4_dir_entry_2 * de;
|
|
handle_t *handle;
|
|
|
|
/* Initialize quotas before so that eventual writes go in
|
|
* separate transaction */
|
|
DQUOT_INIT(dentry->d_inode);
|
|
handle = ext4_journal_start(dir, EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
retval = -ENOENT;
|
|
bh = ext4_find_entry (dentry, &de);
|
|
if (!bh)
|
|
goto end_rmdir;
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
handle->h_sync = 1;
|
|
|
|
inode = dentry->d_inode;
|
|
|
|
retval = -EIO;
|
|
if (le32_to_cpu(de->inode) != inode->i_ino)
|
|
goto end_rmdir;
|
|
|
|
retval = -ENOTEMPTY;
|
|
if (!empty_dir (inode))
|
|
goto end_rmdir;
|
|
|
|
retval = ext4_delete_entry(handle, dir, de, bh);
|
|
if (retval)
|
|
goto end_rmdir;
|
|
if (!EXT4_DIR_LINK_EMPTY(inode))
|
|
ext4_warning (inode->i_sb, "ext4_rmdir",
|
|
"empty directory has too many links (%d)",
|
|
inode->i_nlink);
|
|
inode->i_version++;
|
|
clear_nlink(inode);
|
|
/* There's no need to set i_disksize: the fact that i_nlink is
|
|
* zero will ensure that the right thing happens during any
|
|
* recovery. */
|
|
inode->i_size = 0;
|
|
ext4_orphan_add(handle, inode);
|
|
inode->i_ctime = dir->i_ctime = dir->i_mtime = ext4_current_time(inode);
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
ext4_dec_count(handle, dir);
|
|
ext4_update_dx_flag(dir);
|
|
ext4_mark_inode_dirty(handle, dir);
|
|
|
|
end_rmdir:
|
|
ext4_journal_stop(handle);
|
|
brelse (bh);
|
|
return retval;
|
|
}
|
|
|
|
static int ext4_unlink(struct inode * dir, struct dentry *dentry)
|
|
{
|
|
int retval;
|
|
struct inode * inode;
|
|
struct buffer_head * bh;
|
|
struct ext4_dir_entry_2 * de;
|
|
handle_t *handle;
|
|
|
|
/* Initialize quotas before so that eventual writes go
|
|
* in separate transaction */
|
|
DQUOT_INIT(dentry->d_inode);
|
|
handle = ext4_journal_start(dir, EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
handle->h_sync = 1;
|
|
|
|
retval = -ENOENT;
|
|
bh = ext4_find_entry (dentry, &de);
|
|
if (!bh)
|
|
goto end_unlink;
|
|
|
|
inode = dentry->d_inode;
|
|
|
|
retval = -EIO;
|
|
if (le32_to_cpu(de->inode) != inode->i_ino)
|
|
goto end_unlink;
|
|
|
|
if (!inode->i_nlink) {
|
|
ext4_warning (inode->i_sb, "ext4_unlink",
|
|
"Deleting nonexistent file (%lu), %d",
|
|
inode->i_ino, inode->i_nlink);
|
|
inode->i_nlink = 1;
|
|
}
|
|
retval = ext4_delete_entry(handle, dir, de, bh);
|
|
if (retval)
|
|
goto end_unlink;
|
|
dir->i_ctime = dir->i_mtime = ext4_current_time(dir);
|
|
ext4_update_dx_flag(dir);
|
|
ext4_mark_inode_dirty(handle, dir);
|
|
drop_nlink(inode);
|
|
if (!inode->i_nlink)
|
|
ext4_orphan_add(handle, inode);
|
|
inode->i_ctime = ext4_current_time(inode);
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
retval = 0;
|
|
|
|
end_unlink:
|
|
ext4_journal_stop(handle);
|
|
brelse (bh);
|
|
return retval;
|
|
}
|
|
|
|
static int ext4_symlink (struct inode * dir,
|
|
struct dentry *dentry, const char * symname)
|
|
{
|
|
handle_t *handle;
|
|
struct inode * inode;
|
|
int l, err, retries = 0;
|
|
|
|
l = strlen(symname)+1;
|
|
if (l > dir->i_sb->s_blocksize)
|
|
return -ENAMETOOLONG;
|
|
|
|
retry:
|
|
handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 5 +
|
|
2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb));
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
handle->h_sync = 1;
|
|
|
|
inode = ext4_new_inode (handle, dir, S_IFLNK|S_IRWXUGO);
|
|
err = PTR_ERR(inode);
|
|
if (IS_ERR(inode))
|
|
goto out_stop;
|
|
|
|
if (l > sizeof (EXT4_I(inode)->i_data)) {
|
|
inode->i_op = &ext4_symlink_inode_operations;
|
|
ext4_set_aops(inode);
|
|
/*
|
|
* page_symlink() calls into ext4_prepare/commit_write.
|
|
* We have a transaction open. All is sweetness. It also sets
|
|
* i_size in generic_commit_write().
|
|
*/
|
|
err = __page_symlink(inode, symname, l,
|
|
mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
|
|
if (err) {
|
|
clear_nlink(inode);
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
iput (inode);
|
|
goto out_stop;
|
|
}
|
|
} else {
|
|
/* clear the extent format for fast symlink */
|
|
EXT4_I(inode)->i_flags &= ~EXT4_EXTENTS_FL;
|
|
inode->i_op = &ext4_fast_symlink_inode_operations;
|
|
memcpy((char*)&EXT4_I(inode)->i_data,symname,l);
|
|
inode->i_size = l-1;
|
|
}
|
|
EXT4_I(inode)->i_disksize = inode->i_size;
|
|
err = ext4_add_nondir(handle, dentry, inode);
|
|
out_stop:
|
|
ext4_journal_stop(handle);
|
|
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
|
|
goto retry;
|
|
return err;
|
|
}
|
|
|
|
static int ext4_link (struct dentry * old_dentry,
|
|
struct inode * dir, struct dentry *dentry)
|
|
{
|
|
handle_t *handle;
|
|
struct inode *inode = old_dentry->d_inode;
|
|
int err, retries = 0;
|
|
|
|
if (EXT4_DIR_LINK_MAX(inode))
|
|
return -EMLINK;
|
|
|
|
/*
|
|
* Return -ENOENT if we've raced with unlink and i_nlink is 0. Doing
|
|
* otherwise has the potential to corrupt the orphan inode list.
|
|
*/
|
|
if (inode->i_nlink == 0)
|
|
return -ENOENT;
|
|
|
|
retry:
|
|
handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS);
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
handle->h_sync = 1;
|
|
|
|
inode->i_ctime = ext4_current_time(inode);
|
|
ext4_inc_count(handle, inode);
|
|
atomic_inc(&inode->i_count);
|
|
|
|
err = ext4_add_nondir(handle, dentry, inode);
|
|
ext4_journal_stop(handle);
|
|
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
|
|
goto retry;
|
|
return err;
|
|
}
|
|
|
|
#define PARENT_INO(buffer) \
|
|
(ext4_next_entry((struct ext4_dir_entry_2 *)(buffer))->inode)
|
|
|
|
/*
|
|
* Anybody can rename anything with this: the permission checks are left to the
|
|
* higher-level routines.
|
|
*/
|
|
static int ext4_rename (struct inode * old_dir, struct dentry *old_dentry,
|
|
struct inode * new_dir,struct dentry *new_dentry)
|
|
{
|
|
handle_t *handle;
|
|
struct inode * old_inode, * new_inode;
|
|
struct buffer_head * old_bh, * new_bh, * dir_bh;
|
|
struct ext4_dir_entry_2 * old_de, * new_de;
|
|
int retval;
|
|
|
|
old_bh = new_bh = dir_bh = NULL;
|
|
|
|
/* Initialize quotas before so that eventual writes go
|
|
* in separate transaction */
|
|
if (new_dentry->d_inode)
|
|
DQUOT_INIT(new_dentry->d_inode);
|
|
handle = ext4_journal_start(old_dir, 2 *
|
|
EXT4_DATA_TRANS_BLOCKS(old_dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
|
|
handle->h_sync = 1;
|
|
|
|
old_bh = ext4_find_entry (old_dentry, &old_de);
|
|
/*
|
|
* Check for inode number is _not_ due to possible IO errors.
|
|
* We might rmdir the source, keep it as pwd of some process
|
|
* and merrily kill the link to whatever was created under the
|
|
* same name. Goodbye sticky bit ;-<
|
|
*/
|
|
old_inode = old_dentry->d_inode;
|
|
retval = -ENOENT;
|
|
if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino)
|
|
goto end_rename;
|
|
|
|
new_inode = new_dentry->d_inode;
|
|
new_bh = ext4_find_entry (new_dentry, &new_de);
|
|
if (new_bh) {
|
|
if (!new_inode) {
|
|
brelse (new_bh);
|
|
new_bh = NULL;
|
|
}
|
|
}
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
if (new_inode) {
|
|
retval = -ENOTEMPTY;
|
|
if (!empty_dir (new_inode))
|
|
goto end_rename;
|
|
}
|
|
retval = -EIO;
|
|
dir_bh = ext4_bread (handle, old_inode, 0, 0, &retval);
|
|
if (!dir_bh)
|
|
goto end_rename;
|
|
if (le32_to_cpu(PARENT_INO(dir_bh->b_data)) != old_dir->i_ino)
|
|
goto end_rename;
|
|
retval = -EMLINK;
|
|
if (!new_inode && new_dir!=old_dir &&
|
|
new_dir->i_nlink >= EXT4_LINK_MAX)
|
|
goto end_rename;
|
|
}
|
|
if (!new_bh) {
|
|
retval = ext4_add_entry (handle, new_dentry, old_inode);
|
|
if (retval)
|
|
goto end_rename;
|
|
} else {
|
|
BUFFER_TRACE(new_bh, "get write access");
|
|
ext4_journal_get_write_access(handle, new_bh);
|
|
new_de->inode = cpu_to_le32(old_inode->i_ino);
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
|
|
EXT4_FEATURE_INCOMPAT_FILETYPE))
|
|
new_de->file_type = old_de->file_type;
|
|
new_dir->i_version++;
|
|
new_dir->i_ctime = new_dir->i_mtime =
|
|
ext4_current_time(new_dir);
|
|
ext4_mark_inode_dirty(handle, new_dir);
|
|
BUFFER_TRACE(new_bh, "call ext4_journal_dirty_metadata");
|
|
ext4_journal_dirty_metadata(handle, new_bh);
|
|
brelse(new_bh);
|
|
new_bh = NULL;
|
|
}
|
|
|
|
/*
|
|
* Like most other Unix systems, set the ctime for inodes on a
|
|
* rename.
|
|
*/
|
|
old_inode->i_ctime = ext4_current_time(old_inode);
|
|
ext4_mark_inode_dirty(handle, old_inode);
|
|
|
|
/*
|
|
* ok, that's it
|
|
*/
|
|
if (le32_to_cpu(old_de->inode) != old_inode->i_ino ||
|
|
old_de->name_len != old_dentry->d_name.len ||
|
|
strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) ||
|
|
(retval = ext4_delete_entry(handle, old_dir,
|
|
old_de, old_bh)) == -ENOENT) {
|
|
/* old_de could have moved from under us during htree split, so
|
|
* make sure that we are deleting the right entry. We might
|
|
* also be pointing to a stale entry in the unused part of
|
|
* old_bh so just checking inum and the name isn't enough. */
|
|
struct buffer_head *old_bh2;
|
|
struct ext4_dir_entry_2 *old_de2;
|
|
|
|
old_bh2 = ext4_find_entry(old_dentry, &old_de2);
|
|
if (old_bh2) {
|
|
retval = ext4_delete_entry(handle, old_dir,
|
|
old_de2, old_bh2);
|
|
brelse(old_bh2);
|
|
}
|
|
}
|
|
if (retval) {
|
|
ext4_warning(old_dir->i_sb, "ext4_rename",
|
|
"Deleting old file (%lu), %d, error=%d",
|
|
old_dir->i_ino, old_dir->i_nlink, retval);
|
|
}
|
|
|
|
if (new_inode) {
|
|
ext4_dec_count(handle, new_inode);
|
|
new_inode->i_ctime = ext4_current_time(new_inode);
|
|
}
|
|
old_dir->i_ctime = old_dir->i_mtime = ext4_current_time(old_dir);
|
|
ext4_update_dx_flag(old_dir);
|
|
if (dir_bh) {
|
|
BUFFER_TRACE(dir_bh, "get_write_access");
|
|
ext4_journal_get_write_access(handle, dir_bh);
|
|
PARENT_INO(dir_bh->b_data) = cpu_to_le32(new_dir->i_ino);
|
|
BUFFER_TRACE(dir_bh, "call ext4_journal_dirty_metadata");
|
|
ext4_journal_dirty_metadata(handle, dir_bh);
|
|
ext4_dec_count(handle, old_dir);
|
|
if (new_inode) {
|
|
/* checked empty_dir above, can't have another parent,
|
|
* ext4_dec_count() won't work for many-linked dirs */
|
|
new_inode->i_nlink = 0;
|
|
} else {
|
|
ext4_inc_count(handle, new_dir);
|
|
ext4_update_dx_flag(new_dir);
|
|
ext4_mark_inode_dirty(handle, new_dir);
|
|
}
|
|
}
|
|
ext4_mark_inode_dirty(handle, old_dir);
|
|
if (new_inode) {
|
|
ext4_mark_inode_dirty(handle, new_inode);
|
|
if (!new_inode->i_nlink)
|
|
ext4_orphan_add(handle, new_inode);
|
|
}
|
|
retval = 0;
|
|
|
|
end_rename:
|
|
brelse (dir_bh);
|
|
brelse (old_bh);
|
|
brelse (new_bh);
|
|
ext4_journal_stop(handle);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* directories can handle most operations...
|
|
*/
|
|
const struct inode_operations ext4_dir_inode_operations = {
|
|
.create = ext4_create,
|
|
.lookup = ext4_lookup,
|
|
.link = ext4_link,
|
|
.unlink = ext4_unlink,
|
|
.symlink = ext4_symlink,
|
|
.mkdir = ext4_mkdir,
|
|
.rmdir = ext4_rmdir,
|
|
.mknod = ext4_mknod,
|
|
.rename = ext4_rename,
|
|
.setattr = ext4_setattr,
|
|
#ifdef CONFIG_EXT4DEV_FS_XATTR
|
|
.setxattr = generic_setxattr,
|
|
.getxattr = generic_getxattr,
|
|
.listxattr = ext4_listxattr,
|
|
.removexattr = generic_removexattr,
|
|
#endif
|
|
.permission = ext4_permission,
|
|
};
|
|
|
|
const struct inode_operations ext4_special_inode_operations = {
|
|
.setattr = ext4_setattr,
|
|
#ifdef CONFIG_EXT4DEV_FS_XATTR
|
|
.setxattr = generic_setxattr,
|
|
.getxattr = generic_getxattr,
|
|
.listxattr = ext4_listxattr,
|
|
.removexattr = generic_removexattr,
|
|
#endif
|
|
.permission = ext4_permission,
|
|
};
|