Mike Snitzer 22f9c13508 dm thin: do not set discard_zeroes_data ... commit 307615a26e upstream. The dm thin pool target claims to support the zeroing of discarded data areas. This turns out to be incorrect when processing discards that do not exactly cover a complete number of blocks, so the target must always set discard_zeroes_data_unsupported. The thin pool target will zero blocks when they are allocated if the skip_block_zeroing feature is not specified. The block layer may send a discard that only partly covers a block. If a thin pool block is partially discarded then there is no guarantee that the discarded data will get zeroed before it is accessed again. Due to this, thin devices cannot claim discards will always zero data. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: Libo Chen <libo.chen@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2013-05-19 10:54:48 -07:00
..
persistent-data	dm persistent data: rename node to btree_node	2013-01-17 08:50:51 -08:00
bitmap.c	md/bitmap: fix calculation of 'chunks' - missing shift.	2012-05-04 17:03:18 +10:00
bitmap.h	md/bitmap: fix calculation of 'chunks' - missing shift.	2012-05-04 17:03:18 +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 ioctl: prevent unsafe change to dm_ioctl data_size	2013-01-17 08:50:51 -08:00
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: check if scsi_dh module already loaded before trying to load	2012-05-12 01:43:21 +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-raid.c	DM RAID: Use safe version of rdev_for_each	2012-04-24 10:23:13 +10:00
dm-raid1.c	dm raid1: set discard_zeroes_data_unsupported	2012-07-29 08:04:21 -07:00
dm-region-hash.c	dm raid1: fix crash with mirror recovery and discard	2012-07-29 08:04:21 -07:00
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: fix error return code in snapshot_ctr	2013-05-19 10:54:37 -07:00
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 table: clear add_random unless all devices have it set	2012-10-07 08:32:22 -07:00
dm-target.c	dm: error return error for discards	2010-08-12 04:14:14 +01:00
dm-thin-metadata.c	dm thin: relax hard limit on the maximum size of a metadata device	2012-03-28 18:41:28 +01:00
dm-thin-metadata.h	dm thin: relax hard limit on the maximum size of a metadata device	2012-03-28 18:41:28 +01:00
dm-thin.c	dm thin: do not set discard_zeroes_data	2013-05-19 10:54:48 -07:00
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 verity: fix overflow check	2012-10-07 08:32:22 -07:00
dm-zero.c	dm: zero silently drop discards	2010-08-12 04:14:12 +01:00
dm.c	dm: fix deadlock with request based dm and queue request_fn recursion	2012-12-03 11:47:07 -08:00
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: bad block list should default to disabled.	2013-05-07 19:51:56 -07:00
md.h	md/raid10: handle merge_bvec_fn in member devices.	2012-03-19 12:46:39 +11:00
multipath.c	md: tidy up rdev_for_each usage.	2012-03-19 12:46:39 +11:00
multipath.h	md/multipath: typedef removal: multipath_conf_t -> struct mpconf	2011-10-11 16:48:57 +11:00
raid1.c	md/raid1: Fix assembling of arrays containing Replacements.	2012-11-05 09:50:41 +01:00
raid1.h	md/raid1: Allocate spare to store replacement devices and their bios.	2011-12-23 10:17:56 +11:00
raid5.c	md/raid5: fix calculate of 'degraded' when a replacement becomes active.	2012-10-02 10:29:55 -07:00
raid5.h	md/raid5: detect and handle replacements during recovery.	2011-12-23 10:17:53 +11:00
raid10.c	md/raid10: close race that lose writes lost when replacement completes.	2012-12-10 10:59:40 -08:00
raid10.h	md/raid10: fix problem with on-stack allocation of r10bio structure.	2012-10-02 10:30:33 -07:00
raid0.c	md: raid0: fix error return from create_stripe_zones.	2013-03-14 11:29:49 -07:00
raid0.h	md: add proper merge_bvec handling to RAID0 and Linear.	2012-03-19 12:46:39 +11:00