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Fix remap handling by blktrace

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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>
This commit is contained in:
Alan D. Brunelle
2007-08-07 15:30:23 +02:00
committed by Jens Axboe
parent ec05b297f9
commit c7149d6bce
3 changed files with 8 additions and 3 deletions
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3
include/linux/blktrace_api.h
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@ -105,7 +105,7 @@ struct blk_io_trace {
*/
struct blk_io_trace_remap {
__be32 device;
u32 __pad;
__be32 device_from;
__be64 sector;
};
@ -272,6 +272,7 @@ static inline void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
return;
r.device = cpu_to_be32(dev);
r.device_from = cpu_to_be32(bio->bi_bdev->bd_dev);
r.sector = cpu_to_be64(to);
__blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r);