kernel/btrfs-prohibit-a-operation-of-changing-acls-mask-when-noacl-mount-option-is-used.patch

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2010-07-30 00:18:45 +00:00
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) {