NeilBrown a8c906ca3f md/raid5 - avoid deadlocks in get_active_stripe during reshape ... md has functionality to 'quiesce' and array so that all pending IO completed and no new IO starts. This is used to achieve a stable state before making internal changes. Currently this quiescing applies equally to normal IO, resync IO, and reshape IO. However there is a problem with applying it to reshape IO. Reshape can have multiple 'stripe_heads' that must be active together. If the quiesce come between allocating the first and the last of such a collection, then we deadlock, as the last will not be allocated until the quiesce is lifted, the quiesce will not be lifted until the first (which has been allocated) gets used, and that first cannot be used until the last is allocated. It is not necessary to inhibit reshape IO when a quiesce is requested. Those places in the code that require a full quiesce will ensure the reshape thread is not running at all. So allow reshape requests to get access to new stripe_heads without being blocked by a 'quiesce'. This only affects in-place reshapes (i.e. where the array does not grow or shrink) and these are only newly supported. So this patch is not needed in earlier kernels. Signed-off-by: NeilBrown <neilb@suse.de>		2009-06-09 14:39:59 +10:00
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raid6test	md/raid6: move raid6 data processing to raid6_pq.ko	2009-03-31 15:09:39 +11:00
.gitignore
bitmap.c	md: bitmap: improve bitmap maintenance code.	2009-05-26 09:41:17 +10:00
bitmap.h	md: move headers out of include/linux/raid/	2009-03-31 14:27:03 +11:00
dm-bio-record.h	dm: preserve bi_io_vec when resubmitting bios	2009-04-02 19:55:23 +01:00
dm-crypt.c	dm crypt: use kzfree	2009-04-02 19:55:28 +01:00
dm-delay.c	block: move bio list helpers into bio.h	2009-04-15 08:28:09 +02:00
dm-exception-store.c	dm snapshot: move ctr parsing to exception store	2009-04-02 19:55:34 +01:00
dm-exception-store.h	dm snapshot: move status to exception store	2009-04-02 19:55:35 +01:00
dm-io.c	dm io: make sync_io uninterruptible	2009-04-02 19:55:24 +01:00
dm-ioctl.c	dm: add integrity support	2009-04-09 00:27:12 +01:00
dm-kcopyd.c	dm kcopyd: fix callback race	2009-04-09 00:27:17 +01:00
dm-linear.c	dm: remove limited barrier support	2009-04-09 00:27:13 +01:00
dm-log.c	dm log: remove struct dm_dirty_log_internal	2009-04-02 19:55:30 +01:00
dm-mpath.c	block: move bio list helpers into bio.h	2009-04-15 08:28:09 +02:00
dm-mpath.h	dm mpath: remove is_active from struct dm_path	2008-10-10 13:36:58 +01:00
dm-path-selector.c	dm: path selector use module refcount directly	2009-04-02 19:55:27 +01:00
dm-path-selector.h
dm-raid1.c	block: move bio list helpers into bio.h	2009-04-15 08:28:09 +02:00
dm-region-hash.c	block: move bio list helpers into bio.h	2009-04-15 08:28:09 +02:00
dm-round-robin.c	dm: remove dm header from targets	2008-10-21 17:44:59 +01:00
dm-snap-persistent.c	dm snapshot: persistent fix dtr cleanup	2009-04-02 19:55:35 +01:00
dm-snap-transient.c	dm snapshot: move status to exception store	2009-04-02 19:55:35 +01:00
dm-snap.c	block: move bio list helpers into bio.h	2009-04-15 08:28:09 +02:00
dm-stripe.c	dm: consolidate target deregistration error handling	2009-01-06 03:04:58 +00:00
dm-sysfs.c	dm: add name and uuid to sysfs	2009-01-06 03:05:12 +00:00
dm-table.c	dm: remove limited barrier support	2009-04-09 00:27:13 +01:00
dm-target.c	dm target: remove struct tt_internal	2009-04-02 19:55:28 +01:00
dm-uevent.c	md: replace remaining __FUNCTION__ occurrences	2008-04-28 08:58:42 -07:00
dm-uevent.h	dm: uevent generate events	2007-10-20 02:01:26 +01:00
dm-zero.c	dm: consolidate target deregistration error handling	2009-01-06 03:04:58 +00:00
dm.c	block: move bio list helpers into bio.h	2009-04-15 08:28:09 +02:00
dm.h	dm: remove limited barrier support	2009-04-09 00:27:13 +01:00
faulty.c	md: centralize ->array_sectors modifications	2009-03-31 14:59:03 +11:00
Kconfig	md: remove CONFIG_MD_RAID_RESHAPE config option.	2009-03-31 15:27:05 +11:00
linear.c	md: centralize ->array_sectors modifications	2009-03-31 14:59:03 +11:00
linear.h	md: move lots of #include lines out of .h files and into .c	2009-03-31 14:33:13 +11:00
Makefile	md/raid6: move raid6 data processing to raid6_pq.ko	2009-03-31 15:09:39 +11:00
md.c	md: don't use locked_ioctl.	2009-05-26 12:57:36 +10:00
md.h	md: tiny md.h cleanups	2009-04-14 12:01:53 +10:00
mktables.c	md/raid6: move raid6 data processing to raid6_pq.ko	2009-03-31 15:09:39 +11:00
multipath.c	md: centralize ->array_sectors modifications	2009-03-31 14:59:03 +11:00
multipath.h	md: move lots of #include lines out of .h files and into .c	2009-03-31 14:33:13 +11:00
raid0.c	md: 'array_size' sysfs attribute	2009-03-31 15:00:31 +11:00
raid0.h	md: move lots of #include lines out of .h files and into .c	2009-03-31 14:33:13 +11:00
raid1.c	block: move bio list helpers into bio.h	2009-04-15 08:28:09 +02:00
raid1.h	md: move lots of #include lines out of .h files and into .c	2009-03-31 14:33:13 +11:00
raid5.c	md/raid5 - avoid deadlocks in get_active_stripe during reshape	2009-06-09 14:39:59 +10:00
raid5.h	md/raid5 revise rules for when to update metadata during reshape	2009-03-31 15:28:40 +11:00
raid6algos.c	md/raid6: move raid6 data processing to raid6_pq.ko	2009-03-31 15:09:39 +11:00
raid6altivec.uc	md/raid6: move raid6 data processing to raid6_pq.ko	2009-03-31 15:09:39 +11:00
raid6int.uc	md/raid6: move raid6 data processing to raid6_pq.ko	2009-03-31 15:09:39 +11:00
raid6mmx.c	md/raid6: move raid6 data processing to raid6_pq.ko	2009-03-31 15:09:39 +11:00
raid6recov.c	md/raid6: move raid6 data processing to raid6_pq.ko	2009-03-31 15:09:39 +11:00
raid6sse1.c	md/raid6: move raid6 data processing to raid6_pq.ko	2009-03-31 15:09:39 +11:00
raid6sse2.c	md/raid6: move raid6 data processing to raid6_pq.ko	2009-03-31 15:09:39 +11:00
raid6x86.h	md: fix typo in FSF address	2009-03-31 14:57:37 +11:00
raid10.c	md/raid10: don't clear bitmap during recovery if array will still be degraded.	2009-05-07 12:48:10 +10:00
raid10.h	md: move lots of #include lines out of .h files and into .c	2009-03-31 14:33:13 +11:00
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