Mikulas Patocka 650d2a06b4 dm thin: do not send discards to shared blocks ...

When process_discard receives a partial discard that doesn't cover a
full block, it sends this discard down to that block. Unfortunately, the
block can be shared and the discard would corrupt the other snapshots
sharing this block.

This patch detects block sharing and ends the discard with success when
sending it to the shared block.

The above change means that if the device supports discard it can't be
guaranteed that a discard request zeroes data. Therefore, we set
ti->discard_zeroes_data_unsupported.

Thin target discard support with this bug arrived in commit
104655fd4dcebd50068ef30253a001da72e3a081 (dm thin: support discards).

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

2012-07-20 14:25:05 +01:00

..

persistent-data

dm persistent data: fix allocation failure in space map checker init

2012-07-03 12:55:37 +01:00

bitmap.c

md/bitmap: record the space available for the bitmap in the superblock.

2012-05-22 13:55:34 +10:00

bitmap.h

md/bitmap: record the space available for the bitmap in the superblock.

2012-05-22 13:55:34 +10:00

dm-bio-record.h

…

dm-bufio.c

dm bufio: prefetch

2012-03-28 18:41:29 +01:00

dm-bufio.h

dm bufio: prefetch

2012-03-28 18:41:29 +01:00

dm-crypt.c

dm: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

dm-delay.c

dm: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

dm-exception-store.c

dm exception store: fix init error path

2012-03-28 18:41:22 +01:00

dm-exception-store.h

dm snapshot: test chunk size against both origin and snapshot

2010-08-12 04:13:51 +01:00

dm-flakey.c

dm: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

dm-io.c

dm io: fix discard support

2012-03-07 19:09:37 +00:00

dm-ioctl.c

dm: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

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: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

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

connector/userns: replace netlink uses of cap_raised() with capable()

2012-05-10 23:21:39 -04:00

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: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

dm-mpath.c

dm mpath: allow ioctls to trigger pg init

2012-06-03 00:29:58 +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 mpath: add start_io and nr_bytes to path selectors

2009-06-22 10:12:27 +01:00

dm-queue-length.c

dm: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

dm-raid1.c

dm raid1: fix crash with mirror recovery and discard

2012-07-20 14:25:03 +01:00

dm-raid.c

DM RAID: Use md_error() in place of simply setting Faulty bit

2012-05-22 13:55:31 +10:00

dm-region-hash.c

dm raid1: fix crash with mirror recovery and discard

2012-07-20 14:25:03 +01:00

dm-round-robin.c

dm: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

dm-service-time.c

dm: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

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: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

dm-sysfs.c

Driver core: Constify struct sysfs_ops in struct kobj_type

2010-03-07 17:04:49 -08:00

dm-table.c

dm: reject trailing characters in sccanf input

2012-03-28 18:41:26 +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: provide userspace access to pool metadata

2012-06-03 00:30:01 +01:00

dm-thin-metadata.h

dm thin: provide userspace access to pool metadata

2012-06-03 00:30:01 +01:00

dm-thin.c

dm thin: do not send discards to shared blocks

2012-07-20 14:25:05 +01:00

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-verity.c

dm: add verity target

2012-03-28 18:43:38 +01:00

dm-zero.c

dm: zero silently drop discards

2010-08-12 04:14:12 +01:00

dm.c

dm: clear bi_end_io on remapping failure

2012-03-28 18:41:25 +01:00

dm.h

dm table: add immutable feature

2011-10-31 20:19:04 +00:00

faulty.c

md: tidy up rdev_for_each usage.

2012-03-19 12:46:39 +11:00

Kconfig

dm: add verity target

2012-03-28 18:43:38 +01:00

linear.c

md/linear: If md_integrity_register() fails, linear_run() must free the mem.

2012-04-02 09:48:37 +10:00

linear.h

md/linear: typedef removal: linear_conf_t -> struct linear_conf

2011-10-11 16:48:54 +11:00

Makefile

dm: add verity target

2012-03-28 18:43:38 +01:00

md.c

md: support re-add of recovering devices.

2012-07-03 15:59:06 +10:00

md.h

md/bitmap: add new 'space' attribute for bitmaps.

2012-05-22 13:55:07 +10:00

multipath.c

md: make 'name' arg to md_register_thread non-optional.

2012-07-03 15:56:52 +10:00

multipath.h

md/multipath: typedef removal: multipath_conf_t -> struct mpconf

2011-10-11 16:48:57 +11:00

raid0.c

md: Avoid OOPS when reshaping raid1 to raid0

2012-04-03 15:37:26 +10:00

raid0.h

md: add proper merge_bvec handling to RAID0 and Linear.

2012-03-19 12:46:39 +11:00

raid1.c

md/raid1: fix use-after-free bug in RAID1 data-check code.

2012-07-09 11:34:13 +10:00

raid1.h

md/raid1: Allocate spare to store replacement devices and their bios.

2011-12-23 10:17:56 +11:00

raid5.c

md: fix up plugging (again).

2012-07-03 17:45:31 +10:00

raid5.h

raid5: support sync request

2012-05-22 13:55:05 +10:00

raid10.c

md/raid10: fix careless build error

2012-07-04 09:35:35 +10:00

raid10.h

md/raid10: add reshape support

2012-05-22 13:53:47 +10:00