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NeilBrown b2d2c4cead Fix problem with waiting while holding rcu read lock in md/bitmap.c 
A recent patch to protect the rdev list with rcu locking leaves us
with a problem because we can sleep on memalloc while holding the
rcu lock.

The rcu lock is only needed while walking the linked list as
uninteresting devices (failed or spares) can be removed at any time.

So only take the rcu lock while actually walking the linked list.
Take a refcount on the rdev during the time when we drop the lock
and do the memalloc to start IO.
When we return to the locked code, all the interesting devices
on the list will not have moved, so we can simply use
list_for_each_continue_rcu to pick up where we left off.

Signed-off-by: NeilBrown <neilb@suse.de>
2008-09-01 12:48:13 +10:00
..
raid6test md: raid6: clean up the style of raid6test/test.c 2008-02-06 10:41:18 -08:00
.gitignore
bitmap.c Fix problem with waiting while holding rcu read lock in md/bitmap.c 2008-09-01 12:48:13 +10:00
dm-bio-list.h
dm-bio-record.h
dm-crypt.c dm crypt: add merge 2008-07-21 12:00:40 +01:00
dm-delay.c
dm-exception-store.c dm: move include files 2008-04-25 13:26:55 +01:00
dm-io.c dm: unplug queues in threads 2008-04-25 13:26:57 +01:00
dm-ioctl.c dm ioctl: use uninitialized_var 2008-02-08 02:10:16 +00:00
dm-kcopyd.c dm: unplug queues in threads 2008-04-25 13:26:57 +01:00
dm-linear.c dm: linear add merge 2008-07-21 12:00:38 +01:00
dm-log.c dm log: make dm_dirty_log init and exit static 2008-07-21 12:00:27 +01:00
dm-mpath.c [SCSI] scsi_dh: attach to hardware handler from dm-mpath 2008-07-26 15:14:53 -04:00
dm-mpath.h [SCSI] scsi_dh: Remove hardware handler infrastructure from dm 2008-06-05 09:23:42 -05:00
dm-path-selector.c
dm-path-selector.h
dm-raid1.c dm: unplug queues in threads 2008-04-25 13:26:57 +01:00
dm-round-robin.c
dm-snap.c dm snapshot: use per device mempools 2008-07-21 12:00:35 +01:00
dm-snap.h dm snapshot: use per device mempools 2008-07-21 12:00:35 +01:00
dm-stripe.c dm: stripe enhanced status return 2008-02-08 02:11:24 +00:00
dm-table.c [PATCH] switch mtd and dm-table to lookup_bdev() 2008-08-01 11:25:31 -04:00
dm-target.c
dm-uevent.c md: replace remaining __FUNCTION__ occurrences 2008-04-28 08:58:42 -07:00
dm-uevent.h
dm-zero.c
dm.c dm: introduce merge_bvec_fn 2008-07-21 12:00:37 +01:00
dm.h dm log: make dm_dirty_log init and exit static 2008-07-21 12:00:27 +01:00
faulty.c md: Make mddev->array_size sector-based. 2008-07-21 17:05:22 +10:00
Kconfig [SCSI] scsi_dh: fix kconfig related build errors 2008-07-15 09:16:43 -05:00
linear.c Merge branch 'for-linus' of git://neil.brown.name/md 2008-07-21 10:29:12 -07:00
Makefile [SCSI] scsi_dh: Remove hardware handler infrastructure from dm 2008-06-05 09:23:42 -05:00
md.c Remove invalidate_partition call from do_md_stop. 2008-09-01 12:32:52 +10:00
mktables.c
multipath.c md: Make mddev->array_size sector-based. 2008-07-21 17:05:22 +10:00
raid0.c Merge branch 'for-linus' of git://neil.brown.name/md 2008-07-21 10:29:12 -07:00
raid1.c md: Make mddev->array_size sector-based. 2008-07-21 17:05:22 +10:00
raid5.c Don't let a blocked_rdev interfere with read request in raid5/6 2008-08-05 15:56:32 +10:00
raid6.h
raid6algos.c drivers/md: use time_before, time_before_eq, etc 2008-04-28 08:58:42 -07:00
raid6altivec.uc
raid6int.uc
raid6mmx.c
raid6recov.c
raid6sse1.c
raid6sse2.c
raid6x86.h
raid10.c Allow raid10 resync to happening in larger chunks. 2008-08-05 15:56:32 +10:00
unroll.pl