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Martin K. Petersen a934a00a69 block: Fix discard topology stacking and reporting
In some cases we would end up stacking discard_zeroes_data incorrectly.
Fix this by enabling the feature by default for stacking drivers and
clearing it for low-level drivers. Incorporating a device that does not
support dzd will then cause the feature to be disabled in the stacking
driver.

Also ensure that the maximum discard value does not overflow when
exported in sysfs and return 0 in the alignment and dzd fields for
devices that don't support discard.

Reported-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2011-05-18 10:37:35 +02:00
..
Kconfig kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
Kconfig.iosched blk-cgroup: config options re-arrangement 2010-04-26 19:27:56 +02:00
Makefile Merge branch 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block 2010-10-22 17:07:18 -07:00
blk-cgroup.c Fix common misspellings 2011-03-31 11:26:23 -03:00
blk-cgroup.h blk-cgroup: Add unaccounted time to timeslice_used. 2011-03-12 16:54:00 +01:00
blk-core.c block: add blk_run_queue_async 2011-04-18 11:41:33 +02:00
blk-exec.c block: Remove 'plug/unplug' comment in blk_execute_rq_nowait 2011-05-05 15:10:05 -06:00
blk-flush.c block: hold queue if flush is running for non-queueable flush drive 2011-05-06 11:36:25 -06:00
blk-integrity.c dm: improve block integrity support 2011-04-05 23:52:43 +02:00
blk-ioc.c block: Clean up exit_io_context() source code. 2010-12-21 15:07:45 +01:00
blk-iopoll.c tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
blk-lib.c blkdev: Do not return -EOPNOTSUPP if discard is supported 2011-05-06 19:30:01 -06:00
blk-map.c block: check for proper length of iov entries earlier in blk_rq_map_user_iov() 2010-11-29 10:04:50 +01:00
blk-merge.c block: attempt to merge with existing requests on plug flush 2011-03-21 10:14:27 +01:00
blk-settings.c block: Fix discard topology stacking and reporting 2011-05-18 10:37:35 +02:00
blk-softirq.c generic-ipi: remove CSD_FLAG_WAIT 2009-02-25 14:13:44 +01:00
blk-sysfs.c block: Fix discard topology stacking and reporting 2011-05-18 10:37:35 +02:00
blk-tag.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
blk-throttle.c Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
blk-timeout.c block: ensure jiffies wrap is handled correctly in blk_rq_timed_out_timer 2010-04-21 17:42:08 +02:00
blk.h block: hold queue if flush is running for non-queueable flush drive 2011-05-06 11:36:25 -06:00
bsg.c [SCSI] bsg: correct fault if queue object removed while dev_t open 2010-12-09 09:41:14 -06:00
cfq-iosched.c block: add blk_run_queue_async 2011-04-18 11:41:33 +02:00
cfq.h blk-cgroup: Add unaccounted time to timeslice_used. 2011-03-12 16:54:00 +01:00
compat_ioctl.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
deadline-iosched.c block: remove per-queue plugging 2011-03-10 08:52:07 +01:00
elevator.c iosched: remove redundant sprintf 2011-05-05 18:02:12 -06:00
genhd.c Fix common misspellings 2011-03-31 11:26:23 -03:00
ioctl.c block: fix refcounting in BLKBSZSET 2011-02-24 08:54:21 -08:00
noop-iosched.c block: remove per-queue plugging 2011-03-10 08:52:07 +01:00
scsi_ioctl.c block: take care not to overflow when calculating total iov length 2010-11-10 14:40:42 +01:00