From: Aurelien Aptel <aaptel@xxxxxxxx>
Assuming
- //HOST/a is mounted on /mnt
- //HOST/b is mounted on /mnt/b
On a slow connection, running 'df' and killing it while it's
processing /mnt/b can make cifs_get_inode_info() returns -ERESTARTSYS.
This triggers the following chain of events:
=> the dentry revalidation fail
=> dentry is put and released
=> superblock associated with the dentry is put
=> /mnt/b is unmounted
This patch makes cifs_d_revalidate() return the error instead of
0 (invalid) when cifs_revalidate_dentry() fails, except for ENOENT
where that error means the dentry is invalid.
Signed-off-by: Aurelien Aptel <aaptel@xxxxxxxx>
Suggested-by: Shyam Prasad N <nspmangalore@xxxxxxxxx>
---
fs/cifs/dir.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 68900f1629bff..868c0b7263ec0 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -737,6 +737,7 @@ static int
cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
{
struct inode *inode;
+ int rc;
if (flags & LOOKUP_RCU)
return -ECHILD;
@@ -746,8 +747,11 @@ cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
CIFS_I(inode)->time = 0; /* force reval */
- if (cifs_revalidate_dentry(direntry))
- return 0;
+ rc = cifs_revalidate_dentry(direntry);
+ if (rc) {
+ cifs_dbg(FYI, "cifs_revalidate_dentry failed with rc=%d", rc);
+ return rc == -ENOENT ? 0 : rc;
+ }
else {
/*
* If the inode wasn't known to be a dfs entry when
--
2.29.2
