Guoqing Jiang 8b9277c814 md-cluster: Protect communication with mutexes ... Communication can happen through multiple threads. It is possible that one thread steps over another threads sequence. So, we use mutexes to protect both the send and receive sequences. Send communication is locked through state bit, MD_CLUSTER_SEND_LOCK. Communication is locked with bit manipulation in order to allow "lock and hold" for the add operation. In case of an add operation, if the lock is held, MD_CLUSTER_SEND_LOCKED_ALREADY is set. When md_update_sb() calls metadata_update_start(), it checks (in a single statement to avoid races), if the communication is already locked. If yes, it merely returns zero, else it locks the token lockresource. Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by: NeilBrown <neilb@suse.com>		2016-01-06 11:39:17 +11:00
..
bcache	Merge branch 'for-4.4/io-poll' of git://git.kernel.dk/linux-block	2015-11-10 17:23:49 -08:00
persistent-data	dm btree: fix bufio buffer leaks in dm_btree_del() error path	2015-12-10 10:30:18 -05:00
bitmap.c	md-cluster: Use a small window for resync	2015-10-12 01:32:05 -05:00
bitmap.h	md-cluster: Use a small window for resync	2015-10-12 01:32:05 -05:00
dm-bio-prison.c	block: add a bi_error field to struct bio	2015-07-29 08:55:15 -06:00
dm-bio-prison.h
dm-bio-record.h
dm-bufio.c	dm: convert ffs to __ffs	2015-10-31 19:06:01 -04:00
dm-bufio.h
dm-builtin.c
dm-cache-block-types.h
dm-cache-metadata.c	- Revert a dm-multipath change that caused a regression for unprivledged	2015-11-04 21:19:53 -08:00
dm-cache-metadata.h
dm-cache-policy-cleaner.c	- Revert a dm-multipath change that caused a regression for unprivledged	2015-11-04 21:19:53 -08:00
dm-cache-policy-internal.h
dm-cache-policy-mq.c	dm: convert ffs to __ffs	2015-10-31 19:06:01 -04:00
dm-cache-policy-smq.c	dm: convert ffs to __ffs	2015-10-31 19:06:01 -04:00
dm-cache-policy.c
dm-cache-policy.h
dm-cache-target.c	dm: drop NULL test before kmem_cache_destroy() and mempool_destroy()	2015-10-31 19:06:00 -04:00
dm-crypt.c	dm crypt: fix a possible hang due to race condition on exit	2015-11-19 13:38:30 -05:00
dm-delay.c	dm delay: document that offsets are specified in sectors	2015-10-31 19:06:05 -04:00
dm-era-target.c	dm persistent data: eliminate unnecessary return values	2015-10-31 19:06:02 -04:00
dm-exception-store.c	- Revert a dm-multipath change that caused a regression for unprivledged	2015-11-04 21:19:53 -08:00
dm-exception-store.h	dm snapshot: add new persistent store option to support overflow	2015-10-09 16:57:03 -04:00
dm-flakey.c	dm: refactor ioctl handling	2015-10-31 19:05:59 -04:00
dm-io.c	dm: drop NULL test before kmem_cache_destroy() and mempool_destroy()	2015-10-31 19:06:00 -04:00
dm-ioctl.c	char: make misc_deregister a void function	2015-08-05 10:35:49 -07:00
dm-kcopyd.c	mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd	2015-11-06 17:50:42 -08:00
dm-linear.c	dm linear: remove redundant target name from error messages	2015-10-31 19:06:03 -04:00
dm-log-userspace-base.c	dm: drop NULL test before kmem_cache_destroy() and mempool_destroy()	2015-10-31 19:06:00 -04:00
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c	dm: refactor ioctl handling	2015-10-31 19:05:59 -04:00
dm-log.c
dm-mpath.c	dm mpath: fix infinite recursion in ioctl when no paths and !queue_if_no_path	2015-11-17 14:19:00 -05:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h
dm-queue-length.c
dm-raid.c	dm raid: fix round up of default region size	2015-10-02 12:02:31 -04:00
dm-raid1.c	Merge tag 'dm-4.3-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm	2015-09-02 16:35:26 -07:00
dm-region-hash.c	dm: convert ffs to __ffs	2015-10-31 19:06:01 -04:00
dm-round-robin.c
dm-service-time.c
dm-snap-persistent.c	- Revert a dm-multipath change that caused a regression for unprivledged	2015-11-04 21:19:53 -08:00
dm-snap-transient.c	dm snapshot: add new persistent store option to support overflow	2015-10-09 16:57:03 -04:00
dm-snap.c	dm snapshot: add new persistent store option to support overflow	2015-10-09 16:57:03 -04:00
dm-stats.c	dm stats: report precise_timestamps and histogram in @stats_list output	2015-08-18 17:20:03 -04:00
dm-stats.h
dm-stripe.c	Merge tag 'dm-4.3-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm	2015-09-02 16:35:26 -07:00
dm-switch.c	dm switch: simplify conditional in alloc_region_table()	2015-10-31 19:06:06 -04:00
dm-sysfs.c
dm-table.c	block: Inline blk_integrity in struct gendisk	2015-10-21 14:42:42 -06:00
dm-target.c
dm-thin-metadata.c	dm thin metadata: fix bug when taking a metadata snapshot	2015-12-09 13:18:12 -05:00
dm-thin-metadata.h
dm-thin.c	dm thin: fix regression in advertised discard limits	2015-11-23 14:54:46 -05:00
dm-uevent.c
dm-uevent.h
dm-verity.c	dm: refactor ioctl handling	2015-10-31 19:05:59 -04:00
dm-zero.c	block: add a bi_error field to struct bio	2015-07-29 08:55:15 -06:00
dm.c	dm: do not reuse dm_blk_ioctl block_device input as local variable	2015-11-17 14:18:49 -05:00
dm.h	block: kill merge_bvec_fn() completely	2015-08-13 12:31:57 -06:00
faulty.c	block: add a bi_error field to struct bio	2015-07-29 08:55:15 -06:00
Kconfig	raid5-cache: add crc32c Kconfig dependency	2015-11-09 09:09:52 +11:00
linear.c	block: kill merge_bvec_fn() completely	2015-08-13 12:31:57 -06:00
linear.h
Makefile	raid5: add basic stripe log	2015-10-24 17:16:19 +11:00
md-cluster.c	md-cluster: Protect communication with mutexes	2016-01-06 11:39:17 +11:00
md-cluster.h	md-cluster: append some actions when change bitmap from clustered to none	2016-01-06 11:38:57 +11:00
md.c	md-cluster: Defer MD reloading to mddev->thread	2016-01-06 11:39:10 +11:00
md.h	md-cluster: Defer MD reloading to mddev->thread	2016-01-06 11:39:10 +11:00
multipath.c	md: suspend i/o during runtime blk_integrity_unregister	2015-10-21 14:43:38 -06:00
multipath.h
raid0.c	md/raid0: apply base queue limits *before* disk_stack_limits	2015-10-02 17:23:44 +10:00
raid0.h	block: kill merge_bvec_fn() completely	2015-08-13 12:31:57 -06:00
raid1.c	md updates for 4.4.	2015-11-04 21:12:47 -08:00
raid1.h	md-cluster: Use a small window for resync	2015-10-12 01:32:05 -05:00
raid5-cache.c	raid5-cache: start raid5 readonly if journal is missing	2015-11-01 13:48:29 +11:00
raid5.c	md/raid5: remove redundant check in stripe_add_to_batch_list()	2016-01-06 11:38:22 +11:00
raid5.h	raid5-cache: IO error handling	2015-11-01 13:48:29 +11:00
raid10.c	md/raid10: fix data corruption and crash during resync	2015-12-18 15:19:16 +11:00
raid10.h	md/raid10: ensure device failure recorded before write request returns.	2015-08-31 19:43:45 +02:00