From: Joel Becker <joel.becker@oracle.com>
Date: Thu, 29 Mar 2007 01:27:07 +0000 (-0700)
Subject: ocfs2: Wrap access of directory allocations with ip_alloc_sem.
X-Git-Tag: v2.6.22-rc1~1033^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ee19a77956cb65c5da54d85a5efefe50b39fa6e5;p=pandora-kernel.git

ocfs2: Wrap access of directory allocations with ip_alloc_sem.

OCFS2_I(inode)->ip_alloc_sem is a read-write semaphore protecting
local concurrent access of ocfs2 inodes.  However, ocfs2 directories were
not taking the semaphore while they accessed or modified the allocation
tree.

ocfs2_extend_dir() needs to take the semaphore in a write mode when it
adds to the allocation.  All other directory users get there via
ocfs2_bread(), which takes the semaphore in read mode.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
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