]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
ocfs2: avoid unaligned access to dqc_bitmap
authorAkinobu Mita <akinobu.mita@gmail.com>
Tue, 15 Nov 2011 22:56:34 +0000 (14:56 -0800)
committerJoel Becker <jlbec@evilplan.org>
Thu, 1 Dec 2011 22:39:32 +0000 (14:39 -0800)
commit939255798a468e1a92f03546de6e87be7b491e57
tree4ba0db743223eea3dea3405b3532d98716dcf250
parent249ec93c01db8898058899a80ffb537c8d27f86f
ocfs2: avoid unaligned access to dqc_bitmap

The dqc_bitmap field of struct ocfs2_local_disk_chunk is 32-bit aligned,
but not 64-bit aligned.  The dqc_bitmap is accessed by ocfs2_set_bit(),
ocfs2_clear_bit(), ocfs2_test_bit(), or ocfs2_find_next_zero_bit().  These
are wrapper macros for ext2_*_bit() which need to take an unsigned long
aligned address (though some architectures are able to handle unaligned
address correctly)

So some 64bit architectures may not be able to access the dqc_bitmap
correctly.

This avoids such unaligned access by using another wrapper functions for
ext2_*_bit().  The code is taken from fs/ext4/mballoc.c which also need to
handle unaligned bitmap access.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
fs/ocfs2/ocfs2.h
fs/ocfs2/quota_local.c