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authorJoel Becker <joel.becker@oracle.com>2007-03-28 18:27:07 -0700
committerMark Fasheh <mark.fasheh@oracle.com>2007-05-02 15:07:42 -0700
commitee19a77956cb65c5da54d85a5efefe50b39fa6e5 (patch)
tree1ce4410333f2ad72460cb742d3f5974acb6f9caa /fs/ocfs2/inode.c
parent6cb129f5675c39944e5fe18fd2530a2eb771b754 (diff)
downloadop-kernel-dev-ee19a77956cb65c5da54d85a5efefe50b39fa6e5.zip
op-kernel-dev-ee19a77956cb65c5da54d85a5efefe50b39fa6e5.tar.gz
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>
Diffstat (limited to 'fs/ocfs2/inode.c')
-rw-r--r--fs/ocfs2/inode.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 21a6050..58ec54b 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -1106,8 +1106,10 @@ struct buffer_head *ocfs2_bread(struct inode *inode,
return NULL;
}
+ down_read(&OCFS2_I(inode)->ip_alloc_sem);
tmperr = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
NULL);
+ up_read(&OCFS2_I(inode)->ip_alloc_sem);
if (tmperr < 0) {
mlog_errno(tmperr);
goto fail;
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