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Fix remap handling by blktrace
This patch provides more information concerning REMAP operations on block IOs. The additional information provides clearer details at the user level, and supports post-processing analysis in btt. o Adds in partition remaps on the same device. o Fixed up the remap information in DM to be in the right order o Sent up mapped-from and mapped-to device information Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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@ -3047,6 +3047,10 @@ static inline void blk_partition_remap(struct bio *bio)
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bio->bi_sector += p->start_sect;
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bio->bi_bdev = bdev->bd_contains;
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blk_add_trace_remap(bdev_get_queue(bio->bi_bdev), bio,
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bdev->bd_dev, bio->bi_sector,
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bio->bi_sector - p->start_sect);
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}
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}
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@ -580,8 +580,8 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
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/* the bio has been remapped so dispatch it */
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blk_add_trace_remap(bdev_get_queue(clone->bi_bdev), clone,
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tio->io->bio->bi_bdev->bd_dev, sector,
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clone->bi_sector);
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tio->io->bio->bi_bdev->bd_dev,
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clone->bi_sector, sector);
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generic_make_request(clone);
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} else if (r < 0 || r == DM_MAPIO_REQUEUE) {
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@ -105,7 +105,7 @@ struct blk_io_trace {
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*/
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struct blk_io_trace_remap {
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__be32 device;
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u32 __pad;
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__be32 device_from;
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__be64 sector;
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};
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@ -272,6 +272,7 @@ static inline void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
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return;
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r.device = cpu_to_be32(dev);
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r.device_from = cpu_to_be32(bio->bi_bdev->bd_dev);
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r.sector = cpu_to_be64(to);
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__blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r);
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