AuxXxilium/linux_dsm_epyc7002
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3b8cafdd54
linux_dsm_epyc7002/drivers
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Damien Le Moal 3b8cafdd54 dm zoned: fix zone state management race 
dm-zoned uses the zone flag DMZ_ACTIVE to indicate that a zone of the
backend device is being actively read or written and so cannot be
reclaimed. This flag is set as long as the zone atomic reference
counter is not 0. When this atomic is decremented and reaches 0 (e.g.
on BIO completion), the active flag is cleared and set again whenever
the zone is reused and BIO issued with the atomic counter incremented.
These 2 operations (atomic inc/dec and flag set/clear) are however not
always executed atomically under the target metadata mutex lock and
this causes the warning:

WARN_ON(!test_bit(DMZ_ACTIVE, &zone->flags));

in dmz_deactivate_zone() to be displayed. This problem is regularly
triggered with xfstests generic/209, generic/300, generic/451 and
xfs/077 with XFS being used as the file system on the dm-zoned target
device. Similarly, xfstests ext4/303, ext4/304, generic/209 and
generic/300 trigger the warning with ext4 use.

This problem can be easily fixed by simply removing the DMZ_ACTIVE flag
and managing the "ACTIVE" state by directly looking at the reference
counter value. To do so, the functions dmz_activate_zone() and
dmz_deactivate_zone() are changed to inline functions respectively
calling atomic_inc() and atomic_dec(), while the dmz_is_active() macro
is changed to an inline function calling atomic_read().

Fixes: 3b1a94c88b ("dm zoned: drive-managed zoned block device target")
Cc: stable@vger.kernel.org
Reported-by: Masato Suzuki <masato.suzuki@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2019-07-17 11:03:48 -04:00
..
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ata libata: Extend quirks for the ST1000LM024 drives with NOLPM quirk 2019-06-13 03:17:11 -06:00
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base drivers/base/devres: introduce devm_release_action() 2019-06-13 17:34:56 -10:00
bcma
block block/ps3vram: Use %llu to format sector_t after LBDAF removal 2019-06-13 03:17:50 -06:00
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dax mm/devm_memremap_pages: fix final page put race 2019-06-13 17:34:56 -10:00
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dma SPDX update for 5.2-rc4 2019-06-08 12:52:42 -07:00
dma-buf SPDX update for 5.2-rc4 2019-06-08 12:52:42 -07:00
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gpio A single fix for the PCA953x driver affecting some fringe 2019-06-14 05:48:29 -10:00
gpu Merge branch 'drm-fixes-5.2' of git://people.freedesktop.org/~agd5f/linux into drm-fixes 2019-06-14 17:55:22 +02:00
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hwspinlock
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isdn SPDX update for 5.2-rc3, round 1 2019-05-31 08:34:32 -07:00
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md dm zoned: fix zone state management race 2019-07-17 11:03:48 -04:00
media media updates for v5.2-rc1 2019-06-12 05:57:05 -10:00
memory treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 340 2019-06-05 17:37:07 +02:00
memstick memstick: mspro_block: Fix an error code in mspro_block_issue_req() 2019-05-28 09:53:54 +02:00
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mmc SPDX update for 5.2-rc4 2019-06-08 12:52:42 -07:00
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net SPDX update for 5.2-rc4 2019-06-08 12:52:42 -07:00
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nvdimm mm/devm_memremap_pages: fix final page put race 2019-06-13 17:34:56 -10:00
nvme Merge branch 'nvme-5.2-rc-next' of git://git.infradead.org/nvme into for-linus 2019-06-07 14:04:28 -06:00
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oprofile
parisc SPDX update for 5.2-rc4 2019-06-08 12:52:42 -07:00
parport Char/Misc driver fixes for 5.2-rc4 2019-06-08 12:50:36 -07:00
pci mm/devm_memremap_pages: fix final page put race 2019-06-13 17:34:56 -10:00
pcmcia treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 256 2019-06-05 17:30:27 +02:00
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platform platform/mellanox: mlxreg-hotplug: Add devm_free_irq call to remove flow 2019-06-12 11:49:20 +03:00
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s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-07 09:29:14 -07:00
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