diff options
| author | Chris Mason <chris.mason@oracle.com> | 2008-08-05 10:13:57 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:04:06 -0400 |
| commit | 7d2b4daa67379960477568abda62b8ba9ee3a8aa (patch) | |
| tree | aa24628bd7a0db2f827da77b86c9df94c19d6355 /fs | |
| parent | ae01a0abf343aefe923ace5c1a8c634adfbe29c5 (diff) | |
| download | linux-7d2b4daa67379960477568abda62b8ba9ee3a8aa.tar.bz2 | |
Btrfs: Fix the multi-bio code to save the original bio for completion
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/volumes.c | 11 | ||||
| -rw-r--r-- | fs/btrfs/volumes.h | 1 |
2 files changed, 11 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 0de51e37e789..09311b3066df 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2070,6 +2070,7 @@ static int end_bio_multi_stripe(struct bio *bio, #endif { struct btrfs_multi_bio *multi = bio->bi_private; + int is_orig_bio = 0; #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) if (bio->bi_size) @@ -2078,7 +2079,14 @@ static int end_bio_multi_stripe(struct bio *bio, if (err) atomic_inc(&multi->error); + if (bio == multi->orig_bio) + is_orig_bio = 1; + if (atomic_dec_and_test(&multi->stripes_pending)) { + if (!is_orig_bio) { + bio_put(bio); + bio = multi->orig_bio; + } bio->bi_private = multi->private; bio->bi_end_io = multi->end_io; /* only send an error to the higher layers if it is @@ -2101,7 +2109,7 @@ static int end_bio_multi_stripe(struct bio *bio, #else bio_endio(bio, err); #endif - } else { + } else if (!is_orig_bio) { bio_put(bio); } #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) @@ -2196,6 +2204,7 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, } multi->end_io = first_bio->bi_end_io; multi->private = first_bio->bi_private; + multi->orig_bio = first_bio; atomic_set(&multi->stripes_pending, multi->num_stripes); while(dev_nr < total_devs) { diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 48a44f7a9385..c50e50580b51 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -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; |