AuxXxilium/linux_dsm_epyc7002
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fca028438f
linux_dsm_epyc7002/drivers/md
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Joe Thornber fca028438f dm space map metadata: fix bug in resizing of thin metadata 
This bug was introduced in commit 7e664b3dec ("dm space map metadata:
fix extending the space map").

When extending a dm-thin metadata volume we:

- Switch the space map into a simple bootstrap mode, which allocates
  all space linearly from the newly added space.
- Add new bitmap entries for the new space
- Increment the reference counts for those newly allocated bitmap
  entries
- Commit changes to disk
- Switch back out of bootstrap mode.

But, the disk commit may allocate space itself, if so this fact will be
lost when switching out of bootstrap mode.

The bug exhibited itself as an error when the bitmap_root, with an
erroneous ref count of 0, was subsequently decremented as part of a
later disk commit.  This would cause the disk commit to fail, and thinp
to enter read_only mode.  The metadata was not damaged (thin_check
passed).

The fix is to put the increments + commit into a loop, running until
the commit has not allocated extra space.  In practise this loop only
runs twice.

With this fix the following device mapper testsuite test passes:
 dmtest run --suite thin-provisioning -n thin_remove_works_after_resize

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # depends on commit 7e664b3dec
2014-01-21 12:15:01 -05:00
..
bcache bcache: defensively handle format strings 2013-11-10 21:56:43 -08:00
persistent-data dm space map metadata: fix bug in resizing of thin metadata 2014-01-21 12:15:01 -05:00
bitmap.c sysfs: clean up sysfs_get_dirent() 2013-09-26 15:33:18 -07:00
bitmap.h md/bitmap: record the space available for the bitmap in the superblock. 2012-05-22 13:55:34 +10:00
dm-bio-prison.c dm: add cache target 2013-03-01 22:45:51 +00:00
dm-bio-prison.h dm: add cache target 2013-03-01 22:45:51 +00:00
dm-bio-record.h dm: preserve bi_io_vec when resubmitting bios 2009-04-02 19:55:23 +01:00
dm-bufio.c dm snapshot: use dm-bufio prefetch 2014-01-14 23:23:03 -05:00
dm-bufio.h dm snapshot: use dm-bufio prefetch 2014-01-14 23:23:03 -05:00
dm-builtin.c dm sysfs: fix a module unload race 2014-01-14 23:23:04 -05:00
dm-cache-block-types.h dm: add cache target 2013-03-01 22:45:51 +00:00
dm-cache-metadata.c dm cache metadata: check the metadata version when reading the superblock 2013-11-11 11:37:49 -05:00
dm-cache-metadata.h dm cache: add passthrough mode 2013-11-11 11:37:49 -05:00
dm-cache-policy-cleaner.c dm cache: policy change version from string to integer set 2013-03-20 17:21:27 +00:00
dm-cache-policy-internal.h dm cache: add remove_cblock method to policy interface 2013-11-11 11:37:50 -05:00
dm-cache-policy-mq.c dm cache: add policy name to status output 2014-01-16 13:44:11 -05:00
dm-cache-policy.c dm cache: add policy name to status output 2014-01-16 13:44:11 -05:00
dm-cache-policy.h dm cache: add policy name to status output 2014-01-16 13:44:11 -05:00
dm-cache-target.c dm cache: add policy name to status output 2014-01-16 13:44:11 -05:00
dm-crypt.c tree-wide: use reinit_completion instead of INIT_COMPLETION 2013-11-15 09:32:21 +09:00
dm-delay.c dm delay: use per-bio data instead of a mempool and slab cache 2014-01-07 10:11:45 -05:00
dm-exception-store.c dm: replace simple_strtoul 2012-07-27 15:07:59 +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 flakey: correct ctr alloc failure mesg 2013-07-10 23:41:17 +01:00
dm-io.c dm: add reserved_bio_based_ios module parameter 2013-09-23 10:42:24 -04:00
dm-ioctl.c dm: allow remove to be deferred 2013-11-09 18:20:22 -05:00
dm-kcopyd.c dm: stop using WQ_NON_REENTRANT 2013-08-23 09:02:13 -04:00
dm-linear.c dm: rename request variables to bios 2013-03-01 22:45:47 +00:00
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: use memweight() 2012-07-30 17:25:16 -07:00
dm-mpath.c dm mpath: requeue I/O during pg_init 2013-11-05 11:20:34 -05:00
dm-mpath.h dm mpath: remove is_active from struct dm_path 2008-10-10 13:36:58 +01:00
dm-path-selector.c 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: stop using WQ_NON_REENTRANT 2013-08-23 09:02:13 -04:00
dm-raid.c MD: Remember the last sync operation that was performed 2013-06-26 12:38:24 +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 dm snapshot: use dm-bufio prefetch 2014-01-14 23:23:03 -05:00
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: use GFP_KERNEL when initializing exceptions 2014-01-14 11:18:16 -05:00
dm-stats.c dm stats: initialize read-only module parameter 2013-12-10 19:13:21 -05:00
dm-stats.h dm: add statistics support 2013-09-05 20:46:06 -04:00
dm-stripe.c dm stripe: silence a couple sparse warnings 2013-09-06 11:36:01 -04:00
dm-switch.c dm: add switch target 2013-07-10 23:41:19 +01:00
dm-sysfs.c dm sysfs: fix a module unload race 2014-01-14 23:23:04 -05:00
dm-table.c dm table: remove unused buggy code that extends the targets array 2014-01-07 10:11:44 -05:00
dm-target.c dm: allow error target to replace bio-based and request-based targets 2013-09-05 20:46:05 -04:00
dm-thin-metadata.c dm thin: fix discard support to a previously shared block 2014-01-07 10:11:43 -05:00
dm-thin-metadata.h dm thin: use bool rather than unsigned for flags in structures 2014-01-07 10:14:18 -05:00
dm-thin.c dm thin: fix pool feature parsing 2014-01-15 21:16:24 -05:00
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: use __ffs and __fls 2013-07-10 23:41:17 +01:00
dm-zero.c dm: rename request variables to bios 2013-03-01 22:45:47 +00:00
dm.c dm sysfs: fix a module unload race 2014-01-14 23:23:04 -05:00
dm.h dm sysfs: fix a module unload race 2014-01-14 23:23:04 -05:00
faulty.c block: Add bio_end_sector() 2013-03-23 14:15:29 -07:00
Kconfig dm sysfs: fix a module unload race 2014-01-14 23:23:04 -05:00
linear.c block: Add bio_end_sector() 2013-03-23 14:15:29 -07:00
linear.h md/linear: typedef removal: linear_conf_t -> struct linear_conf 2011-10-11 16:48:54 +11:00
Makefile dm sysfs: fix a module unload race 2014-01-14 23:23:04 -05:00
md.c Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2013-12-05 15:33:27 -08:00
md.h Merge branch 'for-3.13/core' of git://git.kernel.dk/linux-block 2013-11-14 12:08:14 +09:00
multipath.c MD: change the parameter of md thread 2012-10-11 13:34:00 +11:00
multipath.h md/multipath: typedef removal: multipath_conf_t -> struct mpconf 2011-10-11 16:48:57 +11:00
raid0.c md: fix buglet in RAID5 -> RAID0 conversion. 2013-06-26 12:38:19 +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 update for 3.13. 2013-11-20 13:05:25 -08:00
raid1.h raid1: Rewrite the implementation of iobarrier. 2013-11-19 15:19:18 +11:00
raid5.c md/raid5: fix newly-broken locking in get_active_stripe. 2013-11-28 11:00:15 +11:00
raid5.h md update for 3.13. 2013-11-20 13:05:25 -08:00
raid10.c md update for 3.13. 2013-11-20 13:05:25 -08:00
raid10.h MD RAID10: Improve redundancy for 'far' and 'offset' algorithms (part 1) 2013-02-26 11:55:30 +11:00