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f2fs: fix dentry recovery routine 

The error scenario is:
1. create /a
(1.a link /a /b)
2. sync
3. unlinke /a
4. create /a
5. fsync /a
6. Sudden power-off

When the f2fs recovers the fsynced dentry, /a, we discover an exsiting dentry at
f2fs_find_entry() in recover_dentry().

In such the case, we should unlink the existing dentry and its inode
and then recover newly created dentry.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
wifi-calibration
Jaegeuk Kim 2013-05-28 09:19:22 +09:00
parent 3b10b1fd2b
commit 6b8213d9a4
1 changed files with 19 additions and 5 deletions
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24
fs/f2fs/recovery.c
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@ -44,9 +44,10 @@ static int recover_dentry(struct page *ipage, struct inode *inode)
struct f2fs_node *raw_node = (struct f2fs_node *)kaddr;
struct f2fs_inode *raw_inode = &(raw_node->i);
nid_t pino = le32_to_cpu(raw_inode->i_pino);
struct f2fs_dir_entry *de;
struct qstr name;
struct page *page;
struct inode *dir;
struct inode *dir, *einode;
int err = 0;
dir = check_dirty_dir_inode(F2FS_SB(inode->i_sb), pino);
@ -61,13 +62,26 @@ static int recover_dentry(struct page *ipage, struct inode *inode)
name.len = le32_to_cpu(raw_inode->i_namelen);
name.name = raw_inode->i_name;
if (f2fs_find_entry(dir, &name, &page)) {
retry:
de = f2fs_find_entry(dir, &name, &page);
if (de && inode->i_ino == le32_to_cpu(de->ino)) {
kunmap(page);
f2fs_put_page(page, 0);
} else {
err = __f2fs_add_link(dir, &name, inode);
goto out;
}
if (de) {
einode = f2fs_iget(inode->i_sb, le32_to_cpu(de->ino));
if (IS_ERR(einode)) {
WARN_ON(1);
if (PTR_ERR(einode) == -ENOENT)
err = -EEXIST;
goto out;
}
f2fs_delete_entry(de, page, einode);
iput(einode);
goto retry;
}
err = __f2fs_add_link(dir, &name, inode);
out:
f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode and its dentry: "
"ino = %x, name = %s, dir = %lx, err = %d",