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| author | Mark Fasheh <mfasheh@suse.com> | 2008-11-21 14:06:55 -0800 |
|---|---|---|
| committer | Mark Fasheh <mfasheh@suse.com> | 2008-12-01 14:46:58 -0800 |
| commit | d6b58f89f7257c8099c2260e2bea042a917d6cdf (patch) | |
| tree | 0dea65bf25647146c6d4b5dcf022f20b0fdb4006 /fs/ocfs2/buffer_head_io.c | |
| parent | 07d9a3954a68764aefe16855bcd0f86deeb5c825 (diff) | |
| download | lwn-d6b58f89f7257c8099c2260e2bea042a917d6cdf.tar.gz lwn-d6b58f89f7257c8099c2260e2bea042a917d6cdf.zip | |
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/ocfs2/buffer_head_io.c')
| -rw-r--r-- | fs/ocfs2/buffer_head_io.c | 15 |
1 files changed, 4 insertions, 11 deletions
diff --git a/fs/ocfs2/buffer_head_io.c b/fs/ocfs2/buffer_head_io.c index 7e947c672469..3a178ec48d7c 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 " |