[PATCH] knfsd: nfsd4: fix acl xattr length return
We should be using the length from the second vfs_getxattr, in case it
changed. (Note: there's still a small race here; we could end up returning
-ENOMEM if the length increased between the first and second call. I don't
know whether it's worth spending a lot of effort to fix that.)
This makes XFS ACLs usable on NFS exports, which they currently aren't, since
XFS appears to be returning a too-large value for vfs_getxattr() when it's
passed a NULL buffer. So there's probably an XFS bug here too, though since
getxattr with a NULL buffer is usually used to decide how much memory to
allocate, it may be a fairly harmless bug in most cases.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 3101833..6aa92d0 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -371,7 +371,6 @@
static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
{
ssize_t buflen;
- int error;
buflen = vfs_getxattr(dentry, key, NULL, 0);
if (buflen <= 0)
@@ -381,10 +380,7 @@
if (!*buf)
return -ENOMEM;
- error = vfs_getxattr(dentry, key, *buf, buflen);
- if (error < 0)
- return error;
- return buflen;
+ return vfs_getxattr(dentry, key, *buf, buflen);
}
#endif