NeilBrown af8a24347f md: take a reference to mddev during sysfs access. ... When we are accessing an mddev via sysfs we know that the mddev cannot disappear because it has an embedded kobj which is refcounted by sysfs. And we also take the mddev_lock. However this is not enough. The final mddev_put could have been called and the mddev_delayed_delete is waiting for sysfs to let go so it can destroy the kobj and mddev. In this state there are a lot of changes that should not be attempted. To to guard against this we: - initialise mddev->all_mddevs in on last put so the state can be easily detected. - in md_attr_show and md_attr_store, check ->all_mddevs under all_mddevs_lock and mddev_get the mddev if it still appears to be active. This means that if we get to sysfs as the mddev is being deleted we will get -EBUSY. rdev_attr_store and rdev_attr_show are similar but already have sufficient protection. They check that rdev->mddev still points to mddev after taking mddev_lock. As this is cleared before delayed removal which can only be requested under the mddev_lock, this ensure the rdev and mddev are still alive. Signed-off-by: NeilBrown <neilb@suse.de>		2011-12-08 15:49:46 +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/lock: ensure updates to page_attrs are properly locked.	2011-11-23 10:18:52 +11:00
bitmap.h	md: remove typedefs: mddev_t -> struct mddev	2011-10-11 16:47:53 +11:00
dm-bio-record.h
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-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 corrupt_bio_byte error path	2011-09-25 23:26:15 +01:00
dm-io.c	dm io: flush cpu cache with vmapped io	2011-08-02 12:32:01 +01:00
dm-ioctl.c	dm table: add immutable feature	2011-10-31 20:19:04 +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-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.c	dm: use vzalloc	2011-08-02 12:32:02 +01:00
dm-mpath.c	dm table: share target argument parsing functions	2011-08-02 12:32:04 +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	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
dm-raid.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-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
dm-table.c	dm table: add immutable feature	2011-10-31 20:19:04 +00:00
dm-target.c
dm-thin-metadata.c	dm: add thin provisioning target	2011-10-31 20:21:18 +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-zero.c
dm.c	Merge branch 'for-3.2/core' of git://git.kernel.dk/linux-block	2011-11-04 17:06:58 -07:00
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	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
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: take a reference to mddev during sysfs access.	2011-12-08 15:49:46 +11:00
md.h	Merge branch 'for-3.2/core' of git://git.kernel.dk/linux-block	2011-11-04 17:06:58 -07:00
multipath.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
multipath.h	md/multipath: typedef removal: multipath_conf_t -> struct mpconf	2011-10-11 16:48:57 +11:00
raid1.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
raid1.h	md: add proper write-congestion reporting to RAID1 and RAID10.	2011-10-11 16:50:01 +11:00
raid5.c	md/raid5: STRIPE_ACTIVE has lock semantics, add barriers	2011-11-08 16:22:06 +11:00
raid5.h	md/raid5: typedef removal: raid5_conf_t -> struct r5conf	2011-10-11 16:49:52 +11:00
raid10.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
raid10.h	md: add proper write-congestion reporting to RAID1 and RAID10.	2011-10-11 16:50:01 +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