From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Sun, 4 Jun 2006 09:51:37 +0000 (-0700)
Subject: [PATCH] fs/namei.c: Call to file_permission() under a spinlock in do_lookup_path()
X-Git-Tag: v2.6.17-rc6~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6d09bb627d2470299dfb1af0e6d27fb4aece9196;p=pandora-kernel.git

[PATCH] fs/namei.c: Call to file_permission() under a spinlock in do_lookup_path()

From: Trond Myklebust <Trond.Myklebust@netapp.com>

We're presently running lock_kernel() under fs_lock via nfs's ->permission
handler.  That's a ranking bug and sometimes a sleep-in-spinlock bug.  This
problem was introduced in the openat() patchset.

We should not need to hold the current->fs->lock for a codepath that doesn't
use current->fs.

[vsu@altlinux.ru: fix error path]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Al Viro <viro@ftp.linux.org.uk>
Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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