From: Al Viro <viro@ZenIV.linux.org.uk>
Date: Fri, 4 Mar 2011 17:14:37 +0000 (+0000)
Subject: btrfs: don't mess with i_nlink of unlocked inode in rename()
X-Git-Tag: v2.6.39-rc1~19^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=92986796d84ef939e304099dece32572a755b280;p=pandora-kernel.git

btrfs: don't mess with i_nlink of unlocked inode in rename()

old_inode is not locked; it's not safe to play with its link
count.  Instead of bumping it and calling btrfs_unlink_inode(),
add a variant of the latter that does not do btrfs_drop_nlink()/
btrfs_update_inode(), call it instead of btrfs_inc_nlink()/
btrfs_unlink_inode() and do btrfs_update_inode() ourselves.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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