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f2fs: find parent dentry correctly

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If dotdot directory is corrupted, its slot may be ocupied by another
file. In this case, dentry[1] is not the parent directory. Rename and
cross-rename will update the inode in dentry[1] incorrectly.   This
patch finds dotdot dentry by name.

Signed-off-by: Sheng Yong <shengyong1@huawei.com>
[Jaegeuk Kim: remove wron bug_on]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Sheng Yong 2016-06-04 22:01:28 +08:00 committed by Jaegeuk Kim
parent c92737ceec
commit 8be0fea9c0
3 changed files with 2 additions and 35 deletions
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17
fs/f2fs/dir.c
View File

@ -267,22 +267,9 @@ out:
struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
{
struct page *page;
struct f2fs_dir_entry *de;
struct f2fs_dentry_block *dentry_blk;
struct qstr dotdot = QSTR_INIT("..", 2);
if (f2fs_has_inline_dentry(dir))
return f2fs_parent_inline_dir(dir, p);
page = get_lock_data_page(dir, 0, false);
if (IS_ERR(page))
return NULL;
dentry_blk = kmap(page);
de = &dentry_blk->dentry[1];
*p = page;
unlock_page(page);
return de;
return f2fs_find_entry(dir, &dotdot, p);
}
ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)

1
fs/f2fs/f2fs.h
View File

@ -2275,7 +2275,6 @@ int f2fs_write_inline_data(struct inode *, struct page *);
bool recover_inline_data(struct inode *, struct page *);
struct f2fs_dir_entry *find_in_inline_dir(struct inode *,
struct fscrypt_name *, struct page **);
struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *, struct page **);
int make_empty_inline_dir(struct inode *inode, struct inode *, struct page *);
int f2fs_add_inline_entry(struct inode *, const struct qstr *, struct inode *,
nid_t, umode_t);

19
fs/f2fs/inline.c
View File

@ -306,25 +306,6 @@ struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
return de;
}
struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir,
struct page **p)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct page *ipage;
struct f2fs_dir_entry *de;
struct f2fs_inline_dentry *dentry_blk;
ipage = get_node_page(sbi, dir->i_ino);
if (IS_ERR(ipage))
return NULL;
dentry_blk = inline_data_addr(ipage);
de = &dentry_blk->dentry[1];
*p = ipage;
unlock_page(ipage);
return de;
}
int make_empty_inline_dir(struct inode *inode, struct inode *parent,
struct page *ipage)
{