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remarkable-linux/drivers/md
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NeilBrown d6b42dcb99 md/raid1,raid10: avoid deadlock during resync/recovery. 
If RAID1 or RAID10 is used under LVM or some other stacking
block device, it is possible to enter a deadlock during
resync or recovery.
This can happen if the upper level block device creates
two requests to the RAID1 or RAID10.  The first request gets
processed, blocks recovery and queue requests for underlying
requests in current->bio_list.  A resync request then starts
which will wait for those requests and block new IO.

But then the second request to the RAID1/10 will be attempted
and it cannot progress until the resync request completes,
which cannot progress until the underlying device requests complete,
which are on a queue behind that second request.

So allow that second request to proceed even though there is
a resync request about to start.

This is suitable for any -stable kernel.

Cc: stable@vger.kernel.org
Reported-by: Ray Morris <support@bettercgi.com>
Tested-by: Ray Morris <support@bettercgi.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2012-03-19 12:46:38 +11:00
..
persistent-data device-mapper: using EXPORT_SYBOL in dm-space-map-checker.c needs export.h 2011-11-07 10:29:10 -08:00
bitmap.c md/bitmap: ensure to load bitmap when creating via sysfs. 2012-03-19 12:46:37 +11:00
bitmap.h md: remove typedefs: mddev_t -> struct mddev 2011-10-11 16:47:53 +11:00
dm-bio-record.h dm: preserve bi_io_vec when resubmitting bios 2009-04-02 19:55:23 +01:00
dm-bufio.c device-mapper: dm-bufio.c needs to include module.h 2011-11-07 10:29:10 -08:00
dm-bufio.h dm: add bufio 2011-10-31 20:19:09 +00:00
dm-crypt.c dm crypt: always disable discard_zeroes_data 2011-09-25 23:26:21 +01:00
dm-delay.c dm: convert workqueues to alloc_ordered 2011-01-13 19:59:57 +00:00
dm-exception-store.c md: Add module.h to all files using it implicitly 2011-10-31 19:31:18 -04:00
dm-exception-store.h
dm-flakey.c dm flakey: fix crash on read when corrupt_bio_byte not set 2012-03-07 19:09:39 +00:00
dm-io.c dm io: fix discard support 2012-03-07 19:09:37 +00:00
dm-ioctl.c dm ioctl: do not leak argv if target message only contains whitespace 2012-03-07 19:09:34 +00:00
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: do not forward ioctls from logical volumes to the underlying device 2012-01-14 15:07:24 -08:00
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 netlink: kill eff_cap from struct netlink_skb_parms 2011-03-03 13:32:07 -08:00
dm-log-userspace-transfer.h dm log: userspace add luid to distinguish between concurrent log instances 2009-09-04 20:40:34 +01:00
dm-log.c dm: use vzalloc 2011-08-02 12:32:02 +01:00
dm-mpath.c dm: do not forward ioctls from logical volumes to the underlying device 2012-01-14 15:07:24 -08:00
dm-mpath.h dm mpath: remove is_active from struct dm_path 2008-10-10 13:36:58 +01:00
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 atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
dm-raid.c dm raid: fix flush support 2012-03-07 19:09:48 +00:00
dm-raid1.c dm kcopyd: return client directly and not through a pointer 2011-05-29 13:03:13 +01:00
dm-region-hash.c Fix common misspellings 2011-03-31 11:26:23 -03:00
dm-round-robin.c md: Add module.h to all files using it implicitly 2011-10-31 19:31:18 -04:00
dm-service-time.c md: Add module.h to all files using it implicitly 2011-10-31 19:31:18 -04:00
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 snapshot: skip reading origin when overwriting complete chunk 2011-08-02 12:32:04 +01:00
dm-stripe.c dm stripe: implement merge method 2011-03-24 13:54:35 +00:00
dm-sysfs.c Driver core: Constify struct sysfs_ops in struct kobj_type 2010-03-07 17:04:49 -08:00
dm-table.c block: Introduce blk_set_stacking_limits function 2012-01-11 16:27:11 +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: decrement counter after removing mapped block 2012-03-07 19:09:44 +00:00
dm-thin-metadata.h dm: add thin provisioning target 2011-10-31 20:21:18 +00:00
dm-thin.c dm: add thin provisioning target 2011-10-31 20:21:18 +00:00
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: uevent generate events 2007-10-20 02:01:26 +01:00
dm-zero.c
dm.c fs: move code out of buffer.c 2012-01-03 22:54:07 -05:00
dm.h dm table: add immutable feature 2011-10-31 20:19:04 +00:00
faulty.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
Kconfig dm: add thin provisioning target 2011-10-31 20:21:18 +00:00
linear.c md/linear: fix hot-add of devices to linear arrays. 2011-12-23 09:56:55 +11:00
linear.h md/linear: typedef removal: linear_conf_t -> struct linear_conf 2011-10-11 16:48:54 +11:00
Makefile dm: add thin provisioning target 2011-10-31 20:21:18 +00:00
md.c md: don't set md arrays to readonly on shutdown. 2012-03-19 12:46:37 +11:00
md.h md: create externally visible flags for supporting hot-replace. 2011-12-23 10:17:51 +11:00
multipath.c md: change hot_remove_disk to take an rdev rather than a number. 2011-12-23 10:17:51 +11:00
multipath.h md/multipath: typedef removal: multipath_conf_t -> struct mpconf 2011-10-11 16:48:57 +11:00
raid0.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
raid0.h md/raid0: typedef removal: raid0_conf_t -> struct r0conf 2011-10-11 16:48:59 +11:00
raid1.c md/raid1,raid10: avoid deadlock during resync/recovery. 2012-03-19 12:46:38 +11:00
raid1.h md/raid1: Allocate spare to store replacement devices and their bios. 2011-12-23 10:17:56 +11:00
raid5.c md: allow re-add to failed arrays. 2012-03-19 12:46:37 +11:00
raid5.h md/raid5: detect and handle replacements during recovery. 2011-12-23 10:17:53 +11:00
raid10.c md/raid1,raid10: avoid deadlock during resync/recovery. 2012-03-19 12:46:38 +11:00
raid10.h md/raid10: prepare data structures for handling replacement. 2011-12-23 10:17:54 +11:00