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ocfs2: Wrap access of directory allocations with ip_alloc_sem.

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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>
This commit is contained in:
Joel Becker
2007-03-28 18:27:07 -07:00
committed by Mark Fasheh
parent 6cb129f567
commit ee19a77956
2 changed files with 8 additions and 1 deletions
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2
fs/ocfs2/inode.c
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@@ -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;