From: Shi Weihua <shiwh@cn.fujitsu.com>

Date: Tue, 18 May 2010 00:51:54 +0000 (+0000)

Subject: Btrfs: prohibit a operation of changing acl's mask when noacl mount option used

X-Git-Tag: v2.6.35-rc3~3^2~3

X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=731e3d1b

Btrfs: prohibit a operation of changing acl's mask when noacl mount option used

when used Posix File System Test Suite(pjd-fstest) to test btrfs,

some cases about setfacl failed when noacl mount option used.

I simplified used commands in pjd-fstest, and the following steps

can reproduce it.

------------------------

# cd btrfs-part/

# mkdir aaa

# setfacl -m m::rw aaa    <- successed, but not expected by pjd-fstest.

------------------------

I checked ext3, a warning message occured, like as:

  setfacl: aaa/: Operation not supported

Certainly, it's expected by pjd-fstest.

So, i compared acl.c of btrfs and ext3. Based on that, a patch created.

Fortunately, it works.

Signed-off-by: Shi Weihua <shiwh@cn.fujitsu.com>

Signed-off-by: Chris Mason <chris.mason@oracle.com>

---

diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c

index 6b4d0cc..a372985 100644

--- a/fs/btrfs/acl.c

+++ b/fs/btrfs/acl.c

@@ -163,6 +163,9 @@ static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name,

 	if (!is_owner_or_cap(inode))

 		return -EPERM;

+	if (!IS_POSIXACL(inode))

+		return -EOPNOTSUPP;

+

 	if (value) {

 		acl = posix_acl_from_xattr(value, size);

 		if (acl == NULL) {