linux/block
Martin K. Petersen e692cb668f block: Deprecate QUEUE_FLAG_CLUSTER and use queue_limits instead
When stacking devices, a request_queue is not always available. This
forced us to have a no_cluster flag in the queue_limits that could be
used as a carrier until the request_queue had been set up for a
metadevice.

There were several problems with that approach. First of all it was up
to the stacking device to remember to set queue flag after stacking had
completed. Also, the queue flag and the queue limits had to be kept in
sync at all times. We got that wrong, which could lead to us issuing
commands that went beyond the max scatterlist limit set by the driver.

The proper fix is to avoid having two flags for tracking the same thing.
We deprecate QUEUE_FLAG_CLUSTER and use the queue limit directly in the
block layer merging functions. The queue_limit 'no_cluster' is turned
into 'cluster' to avoid double negatives and to ease stacking.
Clustering defaults to being enabled as before. The queue flag logic is
removed from the stacking function, and explicitly setting the cluster
flag is no longer necessary in DM and MD.

Reported-by: Ed Lin <ed.lin@promise.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>
2010-12-17 08:35:53 +01:00
..
blk-cgroup.c Merge branch 'for-2.6.37/core' of git://git.kernel.dk/linux-2.6-block 2010-10-22 17:00:32 -07:00
blk-cgroup.h blkio-throttle: limit max iops value to UINT_MAX 2010-10-01 21:16:41 +02:00
blk-core.c block: remove REQ_HARDBARRIER 2010-11-10 14:54:09 +01:00
blk-exec.c block: Prevent hang_check firing during long I/O 2010-09-24 15:52:09 +02:00
blk-flush.c block: remove BLKDEV_IFL_WAIT 2010-09-16 20:52:58 +02:00
blk-integrity.c block: Fix double free in blk_integrity_unregister 2010-10-15 15:49:18 +02:00
blk-ioc.c block: remove unused copy_io_context() 2010-11-11 13:40:11 +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 block: remove BLKDEV_IFL_WAIT 2010-09-16 20:52:58 +02:00
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: Deprecate QUEUE_FLAG_CLUSTER and use queue_limits instead 2010-12-17 08:35:53 +01:00
blk-settings.c block: Deprecate QUEUE_FLAG_CLUSTER and use queue_limits instead 2010-12-17 08:35:53 +01:00
blk-softirq.c generic-ipi: remove CSD_FLAG_WAIT 2009-02-25 14:13:44 +01:00
blk-sysfs.c block: Deprecate QUEUE_FLAG_CLUSTER and use queue_limits instead 2010-12-17 08:35:53 +01:00
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 blk-throttle: Correct the placement of smp_rmb() 2010-12-01 19:34:52 +01:00
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 Revert "block: fix accounting bug on cross partition merges" 2010-10-24 22:06:02 +02:00
bsg.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
cfq-iosched.c Merge branch 'for-2.6.37/core' of git://git.kernel.dk/linux-2.6-block 2010-10-22 17:00:32 -07:00
cfq.h blk-cgroup: Prepare the base for supporting more than one IO control policies 2010-09-16 08:42:04 +02:00
compat_ioctl.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
deadline-iosched.c block: convert to pos and nr_sectors accessors 2009-05-11 09:50:54 +02:00
elevator.c block: remove REQ_HARDBARRIER 2010-11-10 14:54:09 +01:00
genhd.c Revert "block: fix accounting bug on cross partition merges" 2010-10-24 22:06:02 +02:00
ioctl.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
Kconfig blkio: Core implementation of throttle policy 2010-09-16 08:42:52 +02:00
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
noop-iosched.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
scsi_ioctl.c block: take care not to overflow when calculating total iov length 2010-11-10 14:40:42 +01:00