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[CIFS] Don't cache timestamps on utimes due to coarse granularity

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force revalidate of the file when any of the timestamps are set since
some filesytem types do not have finer granularity timestamps and
we can not always detect which file systems round timestamps down
to determine whether we can cache the mtime on setattr
samba bugzilla 3775

Acked-by: Shirish Pargaonkar <sharishp@us.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2010-02-08 17:39:58 +00:00
parent 301a6a3177
commit ccd4bb1beb
1 changed files with 11 additions and 1 deletions
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12
fs/cifs/inode.c
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@ -1762,8 +1762,18 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
CIFS_MOUNT_MAP_SPECIAL_CHR);
}
if (!rc)
if (!rc) {
rc = inode_setattr(inode, attrs);
/* force revalidate when any of these times are set since some
of the fs types (eg ext3, fat) do not have fine enough
time granularity to match protocol, and we do not have a
a way (yet) to query the server fs's time granularity (and
whether it rounds times down).
*/
if (!rc && (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME)))
cifsInode->time = 0;
}
out:
kfree(args);
kfree(full_path);