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authorMark Fasheh <mfasheh@suse.com>2008-11-21 14:06:55 -0800
committerMark Fasheh <mfasheh@suse.com>2008-12-01 14:46:58 -0800
commitd6b58f89f7257c8099c2260e2bea042a917d6cdf (patch)
tree0dea65bf25647146c6d4b5dcf022f20b0fdb4006 /fs
parent07d9a3954a68764aefe16855bcd0f86deeb5c825 (diff)
downloadconfigs-d6b58f89f7257c8099c2260e2bea042a917d6cdf.tar.gz
ocfs2: fix regression in ocfs2_read_blocks_sync()
We're panicing in ocfs2_read_blocks_sync() if a jbd-managed buffer is seen. At first glance, this seems ok but in reality it can happen. My test case was to just run 'exorcist'. A struct inode is being pushed out of memory but is then re-read at a later time, before the buffer has been checkpointed by jbd. This causes a BUG to be hit in ocfs2_read_blocks_sync(). Reviewed-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/ocfs2/buffer_head_io.c15
1 files changed, 4 insertions, 11 deletions
diff --git a/fs/ocfs2/buffer_head_io.c b/fs/ocfs2/buffer_head_io.c
index 7e947c67246..3a178ec48d7 100644
--- a/fs/ocfs2/buffer_head_io.c
+++ b/fs/ocfs2/buffer_head_io.c
@@ -112,7 +112,7 @@ int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
bh = bhs[i];
if (buffer_jbd(bh)) {
- mlog(ML_ERROR,
+ mlog(ML_BH_IO,
"trying to sync read a jbd "
"managed bh (blocknr = %llu), skipping\n",
(unsigned long long)bh->b_blocknr);
@@ -147,15 +147,10 @@ int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
for (i = nr; i > 0; i--) {
bh = bhs[i - 1];
- if (buffer_jbd(bh)) {
- mlog(ML_ERROR,
- "the journal got the buffer while it was "
- "locked for io! (blocknr = %llu)\n",
- (unsigned long long)bh->b_blocknr);
- BUG();
- }
+ /* No need to wait on the buffer if it's managed by JBD. */
+ if (!buffer_jbd(bh))
+ wait_on_buffer(bh);
- wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
/* Status won't be cleared from here on out,
* so we can safely record this and loop back
@@ -251,8 +246,6 @@ int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
ignore_cache = 1;
}
- /* XXX: Can we ever get this and *not* have the cached
- * flag set? */
if (buffer_jbd(bh)) {
if (ignore_cache)
mlog(ML_BH_IO, "trying to sync read a jbd "