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Btrfs: Fix the multi-bio code to save the original bio for completion

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The multi-bio code is responsible for duplicating blocks in raid1 and
single spindle duplication.  It has counters to make sure all of
the locations for a given extent are properly written before io completion
is returned to the higher layers.

But, it didn't always complete the same bio it was given, sometimes a
clone was completed instead.  This lead to problems with the async
work queues because they saved a pointer to the bio in a struct off
bi_private.

The fix is to remember the original bio and only complete that one.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-08-05 10:13:57 -04:00
parent ae01a0abf3
commit 7d2b4daa67
2 changed files with 11 additions and 1 deletions
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1
fs/btrfs/volumes.h
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@ -95,6 +95,7 @@ struct btrfs_bio_stripe {
struct btrfs_multi_bio {
atomic_t stripes_pending;
bio_end_io_t *end_io;
struct bio *orig_bio;
void *private;
atomic_t error;
int max_errors;