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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
parent6cb129f5675c39944e5fe18fd2530a2eb771b754 (diff)
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')
-rw-r--r--fs/ocfs2/dir.c7
-rw-r--r--fs/ocfs2/inode.c2
2 files changed, 8 insertions, 1 deletions
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index 67e6866a2a4..c441ef1f2ba 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -403,7 +403,7 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
struct buffer_head **new_de_bh)
{
int status = 0;
- int credits, num_free_extents;
+ int credits, num_free_extents, drop_alloc_sem = 0;
loff_t dir_i_size;
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
struct ocfs2_alloc_context *data_ac = NULL;
@@ -452,6 +452,9 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
}
+ down_write(&OCFS2_I(dir)->ip_alloc_sem);
+ drop_alloc_sem = 1;
+
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
@@ -497,6 +500,8 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
*new_de_bh = new_bh;
get_bh(*new_de_bh);
bail:
+ if (drop_alloc_sem)
+ up_write(&OCFS2_I(dir)->ip_alloc_sem);
if (handle)
ocfs2_commit_trans(osb, handle);
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 21a605079c6..58ec54b6003 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;