forked from luck/tmp_suning_uos_patched
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>
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ae01a0abf3
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7d2b4daa67
@ -2070,6 +2070,7 @@ static int end_bio_multi_stripe(struct bio *bio,
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#endif
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{
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struct btrfs_multi_bio *multi = bio->bi_private;
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int is_orig_bio = 0;
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#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
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if (bio->bi_size)
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@ -2078,7 +2079,14 @@ static int end_bio_multi_stripe(struct bio *bio,
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if (err)
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atomic_inc(&multi->error);
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if (bio == multi->orig_bio)
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is_orig_bio = 1;
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if (atomic_dec_and_test(&multi->stripes_pending)) {
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if (!is_orig_bio) {
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bio_put(bio);
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bio = multi->orig_bio;
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}
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bio->bi_private = multi->private;
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bio->bi_end_io = multi->end_io;
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/* only send an error to the higher layers if it is
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@ -2101,7 +2109,7 @@ static int end_bio_multi_stripe(struct bio *bio,
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#else
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bio_endio(bio, err);
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#endif
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} else {
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} else if (!is_orig_bio) {
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bio_put(bio);
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}
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#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
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@ -2196,6 +2204,7 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
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}
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multi->end_io = first_bio->bi_end_io;
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multi->private = first_bio->bi_private;
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multi->orig_bio = first_bio;
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atomic_set(&multi->stripes_pending, multi->num_stripes);
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while(dev_nr < total_devs) {
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@ -95,6 +95,7 @@ struct btrfs_bio_stripe {
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struct btrfs_multi_bio {
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atomic_t stripes_pending;
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bio_end_io_t *end_io;
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struct bio *orig_bio;
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void *private;
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atomic_t error;
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int max_errors;
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