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@xxxxxxxxxxx>
---
fs/f2fs/recovery.c | 23 ++++++++++++++++-------
1 file changed, 16 insertions(+), 7 deletions(-)
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 0dd2ce1..85f5e54 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -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 +62,21 @@ 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)) {
- kunmap(page);
- f2fs_put_page(page, 0);
- } else {
- err = __f2fs_add_link(dir, &name, inode);
+retry:
+ de = f2fs_find_entry(dir, &name, &page);
+ 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",
--
1.8.1.3.566.gaa39828
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