[CIFS] use sensible file nlink values if unprovided
Certain servers may not set the NumberOfLinks field in query file/path
info responses. In such a case, cifs_inode_needs_reval() assumes that
all regular files are hardlinks and triggers revalidation, leading to
excessive and unnecessary network traffic.
This change hardcodes cf_nlink (and subsequently i_nlink) when not
returned by the server, similar to what already occurs in cifs_mkdir().
Cc: <stable@vger.kernel.org>
Signed-off-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 20efd81..449b6cf 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -558,6 +558,11 @@
fattr->cf_mode &= ~(S_IWUGO);
fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
+ if (fattr->cf_nlink < 1) {
+ cifs_dbg(1, "replacing bogus file nlink value %u\n",
+ fattr->cf_nlink);
+ fattr->cf_nlink = 1;
+ }
}
fattr->cf_uid = cifs_sb->mnt_uid;