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| author | Aurelien Aptel <aaptel@suse.com> | 2021-02-05 17:42:48 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-10 11:12:09 +0300 |
| commit | bdb17579449c1d86201c6714662632febdb9daf4 (patch) | |
| tree | 4b524832c2da459040caa1ff223fc77543bc3ad9 | |
| parent | 22110d9117984e64f246a8d4ab0b4e6a37ba1323 (diff) | |
| download | linux-bdb17579449c1d86201c6714662632febdb9daf4.tar.xz | |
cifs: report error instead of invalid when revalidating a dentry fails
commit 21b200d091826a83aafc95d847139b2b0582f6d1 upstream.
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 (file
deleted) and ESTALE (file recreated).
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Suggested-by: Shyam Prasad N <nspmangalore@gmail.com>
Reviewed-by: Shyam Prasad N <nspmangalore@gmail.com>
CC: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/cifs/dir.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c index 03293e543c07..b92804ff3b33 100644 --- a/fs/cifs/dir.c +++ b/fs/cifs/dir.c @@ -841,6 +841,7 @@ static int cifs_d_revalidate(struct dentry *direntry, unsigned int flags) { struct inode *inode; + int rc; if (flags & LOOKUP_RCU) return -ECHILD; @@ -850,8 +851,25 @@ 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); + switch (rc) { + case -ENOENT: + case -ESTALE: + /* + * Those errors mean the dentry is invalid + * (file was deleted or recreated) + */ + return 0; + default: + /* + * Otherwise some unexpected error happened + * report it as-is to VFS layer + */ + return rc; + } + } else { /* * If the inode wasn't known to be a dfs entry when |