Mike Snitzer 3ae7065616 dm: retain table limits when swapping to new table with no devices ... Add a safety net that will re-use the DM device's existing limits in the event that DM device has a temporary table that doesn't have any component devices. This is to reduce the chance that requests not respecting the hardware limits will reach the device. DM recalculates queue limits based only on devices which currently exist in the table. This creates a problem in the event all devices are temporarily removed such as all paths being lost in multipath. DM will reset the limits to the maximum permissible, which can then assemble requests which exceed the limits of the paths when the paths are restored. The request will fail the blk_rq_check_limits() test when sent to a path with lower limits, and will be retried without end by multipath. This became a much bigger issue after v3.6 commit fe86cdcef ("block: do not artificially constrain max_sectors for stacking drivers"). Reported-by: David Jeffery <djeffery@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>		2012-09-26 23:45:45 +01:00
..
persistent-data	dm persistent data: introduce dm_bm_set_read_only	2012-07-27 15:08:15 +01:00
bitmap.c	md/raid1: submit IO from originating thread instead of md thread.	2012-08-02 08:33:20 +10:00
bitmap.h	md/bitmap: record the space available for the bitmap in the superblock.	2012-05-22 13:55:34 +10:00
dm-bio-record.h
dm-bufio.c	dm bufio: prefetch	2012-03-28 18:41:29 +01:00
dm-bufio.h	dm bufio: prefetch	2012-03-28 18:41:29 +01:00
dm-crypt.c	dm thin: commit before gathering status	2012-07-27 15:08:16 +01:00
dm-delay.c	dm thin: commit before gathering status	2012-07-27 15:08:16 +01:00
dm-exception-store.c	dm: replace simple_strtoul	2012-07-27 15:07:59 +01:00
dm-exception-store.h	dm snapshot: test chunk size against both origin and snapshot	2010-08-12 04:13:51 +01:00
dm-flakey.c	dm thin: commit before gathering status	2012-07-27 15:08:16 +01:00
dm-io.c	dm io: fix discard support	2012-03-07 19:09:37 +00:00
dm-ioctl.c	dm thin: commit before gathering status	2012-07-27 15:08:16 +01:00
dm-kcopyd.c	dm kcopyd: add dm_kcopyd_zero to zero an area	2011-10-31 20:18:58 +00:00
dm-linear.c	dm thin: commit before gathering status	2012-07-27 15:08:16 +01:00
dm-log-userspace-base.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
dm-log-userspace-transfer.c	connector/userns: replace netlink uses of cap_raised() with capable()	2012-05-10 23:21:39 -04:00
dm-log-userspace-transfer.h
dm-log.c	dm: use memweight()	2012-07-30 17:25:16 -07:00
dm-mpath.c	dm mpath: only retry ioctl when no paths if queue_if_no_path set	2012-09-26 23:45:41 +01:00
dm-mpath.h
dm-path-selector.c	md: Add module.h to all files using it implicitly	2011-10-31 19:31:18 -04:00
dm-path-selector.h
dm-queue-length.c	dm: reject trailing characters in sccanf input	2012-03-28 18:41:26 +01:00
dm-raid1.c	dm thin: commit before gathering status	2012-07-27 15:08:16 +01:00
dm-raid.c	Merge branch 'for-next' of git://neil.brown.name/md	2012-08-01 09:02:01 -07:00
dm-region-hash.c	dm raid1: fix crash with mirror recovery and discard	2012-07-20 14:25:03 +01:00
dm-round-robin.c	dm: reject trailing characters in sccanf input	2012-03-28 18:41:26 +01:00
dm-service-time.c	dm: reject trailing characters in sccanf input	2012-03-28 18:41:26 +01:00
dm-snap-persistent.c	md: Add in export.h for files using EXPORT_SYMBOL	2011-10-31 19:31:19 -04:00
dm-snap-transient.c	md: Add in export.h for files using EXPORT_SYMBOL	2011-10-31 19:31:19 -04:00
dm-snap.c	dm thin: commit before gathering status	2012-07-27 15:08:16 +01:00
dm-stripe.c	dm thin: commit before gathering status	2012-07-27 15:08:16 +01:00
dm-sysfs.c
dm-table.c	dm: retain table limits when swapping to new table with no devices	2012-09-26 23:45:45 +01:00
dm-target.c	dm: error return error for discards	2010-08-12 04:14:14 +01:00
dm-thin-metadata.c	dm thin metadata: introduce dm_pool_abort_metadata	2012-07-27 15:08:15 +01:00
dm-thin-metadata.h	dm thin metadata: introduce dm_pool_abort_metadata	2012-07-27 15:08:15 +01:00
dm-thin.c	dm thin: do not set discard_zeroes_data	2012-09-26 23:45:39 +01:00
dm-uevent.c	md: Add in export.h for files using EXPORT_SYMBOL	2011-10-31 19:31:19 -04:00
dm-uevent.h
dm-verity.c	dm thin: commit before gathering status	2012-07-27 15:08:16 +01:00
dm-zero.c	dm: zero silently drop discards	2010-08-12 04:14:12 +01:00
dm.c	dm: retain table limits when swapping to new table with no devices	2012-09-26 23:45:45 +01:00
dm.h	dm: retain table limits when swapping to new table with no devices	2012-09-26 23:45:45 +01:00
faulty.c	md: tidy up rdev_for_each usage.	2012-03-19 12:46:39 +11:00
Kconfig	Additional md update for 3.6	2012-08-02 11:34:40 -07:00
linear.c	md/linear: If md_integrity_register() fails, linear_run() must free the mem.	2012-04-02 09:48:37 +10:00
linear.h	md/linear: typedef removal: linear_conf_t -> struct linear_conf	2011-10-11 16:48:54 +11:00
Makefile	dm: add verity target	2012-03-28 18:43:38 +01:00
md.c	md: make sure metadata is updated when spares are activated or removed.	2012-09-19 12:54:22 +10:00
md.h	blk: pass from_schedule to non-request unplug functions.	2012-07-31 09:08:15 +02:00
multipath.c	md: make 'name' arg to md_register_thread non-optional.	2012-07-03 15:56:52 +10:00
multipath.h	md/multipath: typedef removal: multipath_conf_t -> struct mpconf	2011-10-11 16:48:57 +11:00
raid0.c	md: Avoid OOPS when reshaping raid1 to raid0	2012-04-03 15:37:26 +10:00
raid0.h	md: add proper merge_bvec handling to RAID0 and Linear.	2012-03-19 12:46:39 +11:00
raid1.c	Additional md update for 3.6	2012-08-02 11:34:40 -07:00
raid1.h	md/raid1: prevent merging too large request	2012-07-31 10:03:53 +10:00
raid5.c	md/raid5: fix calculate of 'degraded' when a replacement becomes active.	2012-09-19 12:52:30 +10:00
raid5.h	Additional md update for 3.6	2012-08-02 11:34:40 -07:00
raid10.c	md/raid10: fix problem with on-stack allocation of r10bio structure.	2012-08-18 09:51:42 +10:00
raid10.h	md/raid10: fix problem with on-stack allocation of r10bio structure.	2012-08-18 09:51:42 +10:00