On Wed, May 20 2009, Jeff Garzik wrote: > Jens Axboe wrote: >> Hi, >> >> This patchset switches libata to block layer tagging. It gets rid of yet >> another O(N) command loop. >> >> block/blk-tag.c | 99 +++++++++++++++++++++++++++----------- >> drivers/ata/libata-core.c | 94 ++++++++++-------------------------- >> drivers/ata/libata-scsi.c | 23 ++++++++ >> drivers/ata/libata.h | 19 ++++++- >> include/linux/blkdev.h | 3 + >> include/linux/libata.h | 1 6 files changed, 139 insertions(+), >> 100 deletions(-) > > Will take a look post-sleep... mainly it's a question of possibly :-) > interfering with SCSI's use of block layer tagging. Though for the > moment I will simply assume you verified that ;) Certainly, the patch has been used and sitting in my ssd branch for months now. It essentially just tells SCSI to enable the block layer tagging for libata devices with ncq. Then libata gets block layer tagged requests automatically, and it can simply reuse the assigned tag internally as well. That part is trivial. The nasty bit is when libata makes up its own tag for internal issue, that is what patch #2 covers. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
