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dm: store only first barrier error
With the following patches, more than one error can occur during processing. Change md->barrier_error so that only the first one is recorded and returned to the caller. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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@ -555,7 +555,8 @@ static void dec_pending(struct dm_io *io, int error)
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* a per-device variable for error reporting.
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* Note that you can't touch the bio after end_io_acct
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*/
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md->barrier_error = io_error;
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if (!md->barrier_error)
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md->barrier_error = io_error;
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end_io_acct(io);
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} else {
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end_io_acct(io);
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@ -867,7 +868,8 @@ static void __split_and_process_bio(struct mapped_device *md, struct bio *bio)
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if (!bio_barrier(bio))
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bio_io_error(bio);
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else
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md->barrier_error = -EIO;
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if (!md->barrier_error)
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md->barrier_error = -EIO;
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return;
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}
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@ -1448,16 +1450,15 @@ static void dm_flush(struct mapped_device *md)
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static void process_barrier(struct mapped_device *md, struct bio *bio)
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{
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md->barrier_error = 0;
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dm_flush(md);
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if (bio_empty_barrier(bio)) {
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bio_endio(bio, 0);
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return;
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if (!bio_empty_barrier(bio)) {
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__split_and_process_bio(md, bio);
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dm_flush(md);
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}
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__split_and_process_bio(md, bio);
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dm_flush(md);
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if (md->barrier_error != DM_ENDIO_REQUEUE)
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bio_endio(bio, md->barrier_error);
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else {
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