linux-kernel - [PATCH 3/7] reiserfs: turn of ATTR_KILL_S*ID at beginning of reiserfs

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Message-Id: <200709200910.l8K9AqND001338@dantu.rdu.redhat.com>
Date:	Thu, 20 Sep 2007 05:10:52 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org
Cc:	linux-cifs-client@...ts.samba.org, nfs@...ts.sourceforge.net,
	ecryptfs-devel@...ts.sourceforge.net,
	reiserfs-devel@...r.kernel.org, unionfs@...esystems.org
Subject: [PATCH 3/7] reiserfs: turn of ATTR_KILL_S*ID at beginning of reiserfs_setattr

reiserfs_setattr can call notify_change recursively using the same
iattr struct. This could cause it to trip the BUG() in notify_change.
Fix reiserfs to clear those bits near the beginning of the function.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/reiserfs/inode.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 9ea1200..0804289 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -3061,7 +3061,11 @@ int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = dentry->d_inode;
 	int error;
-	unsigned int ia_valid = attr->ia_valid;
+	unsigned int ia_valid;
+
+	/* must be turned off for recursive notify_change calls */
+	ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID);
+
 	reiserfs_write_lock(inode->i_sb);
 	if (attr->ia_valid & ATTR_SIZE) {
 		/* version 2 items will be caught by the s_maxbytes check
-- 
1.5.2.1

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