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reiserfs: Safely acquire i_mutex from xattr_rmdir 

Relax the reiserfs lock before taking the inode mutex from
xattr_rmdir() to avoid the usual reiserfs lock <-> inode mutex
bad dependency.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Christian Kujau <lists@nerdbynature.de>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2009-12-30 07:40:39 +01:00
parent 8b513f56d4
commit 835d5247d9
1 changed files with 2 additions and 1 deletions
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3
fs/reiserfs/xattr.c
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@ -98,7 +98,8 @@ static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
BUG_ON(!mutex_is_locked(&dir->i_mutex));
vfs_dq_init(dir);
mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD);
reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex,
I_MUTEX_CHILD, dir->i_sb);
dentry_unhash(dentry);
error = dir->i_op->rmdir(dir, dentry);
if (!error)