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linux/drivers/md
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Christoph Hellwig 7df835a32a md: fix a lock order reversal in md_alloc 
Commit b0140891a8 ("md: Fix race when creating a new md device.")
not only moved assigning mddev->gendisk before calling add_disk, which
fixes the races described in the commit log, but also added a
mddev->open_mutex critical section over add_disk and creation of the
md kobj.  Adding a kobject after add_disk is racy vs deleting the gendisk
right after adding it, but md already prevents against that by holding
a mddev->active reference.

On the other hand taking this lock added a lock order reversal with what
is not disk->open_mutex (used to be bdev->bd_mutex when the commit was
added) for partition devices, which need that lock for the internal open
for the partition scan, and a recent commit also takes it for
non-partitioned devices, leading to further lockdep splatter.

Fixes: b0140891a8 ("md: Fix race when creating a new md device.")
Fixes: d626338735 ("block: support delayed holder registration")
Reported-by: syzbot+fadc0aaf497e6a493b9f@syzkaller.appspotmail.com
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: syzbot+fadc0aaf497e6a493b9f@syzkaller.appspotmail.com
Reviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: Song Liu <songliubraving@fb.com>
2021-09-22 08:45:58 -07:00
..
bcache bcache: use bvec_virt 2021-08-16 10:50:33 -06:00
persistent-data dm btree remove: assign new_root only when removal succeeds 2021-06-25 15:25:24 -04:00
dm-bio-prison-v1.c
dm-bio-prison-v1.h
dm-bio-prison-v2.c dm bio prison v2: use true/false for bool variable 2020-01-07 12:07:08 -05:00
dm-bio-prison-v2.h
dm-bio-record.h block: store a block_device pointer in struct bio 2021-01-24 18:17:20 -07:00
dm-bufio.c dm bufio: subtract the number of initial sectors in dm_bufio_get_device_size 2021-03-04 14:53:54 -05:00
dm-builtin.c
dm-cache-background-tracker.c
dm-cache-background-tracker.h
dm-cache-block-types.h
dm-cache-metadata.c dm: use bdev_read_only to check if a device is read-only 2021-01-24 18:15:57 -07:00
dm-cache-metadata.h
dm-cache-policy-internal.h
dm-cache-policy-smq.c
dm-cache-policy.c
dm-cache-policy.h
dm-cache-target.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-clone-metadata.c dm clone metadata: remove unused function 2021-04-19 13:20:31 -04:00
dm-clone-metadata.h dm clone metadata: Fix return type of dm_clone_nr_of_hydrated_regions() 2020-03-27 14:42:51 -04:00
dm-clone-target.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-core.h dm ima: measure data on table load 2021-08-10 13:32:40 -04:00
dm-crypt.c dm crypt: use in_hardirq() instead of deprecated in_irq() 2021-08-20 16:25:07 -04:00
dm-delay.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-dust.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-ebs-target.c - Add DM infrastructure for IMA-based remote attestion. These changes 2021-08-31 14:55:09 -07:00
dm-era-target.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-exception-store.c
dm-exception-store.h
dm-flakey.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-ima.c integrity-v5.15 2021-09-02 12:51:41 -07:00
dm-ima.h dm ima: add version info to dm related events in ima log 2021-08-20 15:59:47 -04:00
dm-init.c dm init: Set file local variable static 2020-08-04 15:51:28 -04:00
dm-integrity.c - Add DM infrastructure for IMA-based remote attestion. These changes 2021-08-31 14:55:09 -07:00
dm-io-tracker.h dm writecache: make writeback pause configurable 2021-06-28 16:30:13 -04:00
dm-io.c block: Add bio_max_segs 2021-02-26 15:49:51 -07:00
dm-ioctl.c dm ima: measure data on device rename 2021-08-10 13:34:23 -04:00
dm-kcopyd.c dm writecache: have ssd writeback wait if the kcopyd workqueue is busy 2021-06-15 15:42:03 -04:00
dm-linear.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-log-userspace-base.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-log.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-mpath.c dm ima: update dm target attributes for ima measurements 2021-08-20 16:07:36 -04:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h dm mpath: pass IO start time to path selector 2020-05-15 10:29:36 -04:00
dm-ps-historical-service-time.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-ps-io-affinity.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-ps-queue-length.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-ps-round-robin.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-ps-service-time.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-raid1.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-raid.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-region-hash.c
dm-rq.c dm: delay registering the gendisk 2021-08-09 11:50:43 -06:00
dm-rq.h
dm-snap-persistent.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-snap-transient.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-snap.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-stats.c dm: replace zero-length array with flexible-array 2020-05-20 17:09:44 -04:00
dm-stats.h
dm-stripe.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-switch.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-sysfs.c
dm-table.c libnvdimm for v5.15 2021-09-09 11:39:57 -07:00
dm-target.c
dm-thin-metadata.c dm space maps: improve performance with inc/dec on ranges of blocks 2021-06-04 12:07:22 -04:00
dm-thin-metadata.h dm thin metadata: Add support for a pre-commit callback 2019-12-05 17:05:24 -05:00
dm-thin.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-uevent.c
dm-uevent.h
dm-unstripe.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-verity-fec.c dm verity fec: fix misaligned RS roots IO 2021-04-14 14:28:29 -04:00
dm-verity-fec.h dm verity fec: fix misaligned RS roots IO 2021-04-14 14:28:29 -04:00
dm-verity-target.c dm ima: update dm target attributes for ima measurements 2021-08-20 16:07:36 -04:00
dm-verity-verify-sig.c dm verity: fix require_signatures module_param permissions 2021-05-25 16:14:05 -04:00
dm-verity-verify-sig.h dm verity: Fix compilation warning 2020-08-04 15:48:13 -04:00
dm-verity.h dm verity: add "panic_on_corruption" error handling mode 2020-07-13 11:47:33 -04:00
dm-writecache.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-zero.c dm: add support for REQ_NOWAIT to various targets 2020-12-04 18:04:35 -05:00
dm-zone.c dm zone: fix dm_revalidate_zones() memory allocation 2021-06-25 15:25:23 -04:00
dm-zoned-metadata.c dm zoned: check zone capacity 2021-06-04 12:07:28 -04:00
dm-zoned-reclaim.c dm kcopyd: avoid useless atomic operations 2021-06-04 12:07:24 -04:00
dm-zoned-target.c dm: update target status functions to support IMA measurement 2021-08-10 13:34:23 -04:00
dm-zoned.h dm zoned: select reclaim zone based on device index 2020-06-05 14:59:53 -04:00
dm.c libnvdimm for v5.15 2021-09-09 11:39:57 -07:00
dm.h dm: introduce zone append emulation 2021-06-04 12:07:37 -04:00
Kconfig dm: make EBS depend on !HIGHMEM 2021-08-16 10:50:32 -06:00
Makefile dm ima: measure data on table load 2021-08-10 13:32:40 -04:00
md-autodetect.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
md-bitmap.c md: Constify attribute_group structs 2021-06-14 22:32:07 -07:00
md-bitmap.h
md-cluster.c for-5.11/drivers-2020-12-14 2020-12-16 13:09:32 -08:00
md-cluster.h
md-faulty.c md: mark some personalities as deprecated 2021-06-14 22:32:07 -07:00
md-linear.c md: mark some personalities as deprecated 2021-06-14 22:32:07 -07:00
md-linear.h md/raid1: Replace zero-length array with flexible-array 2020-05-13 12:02:23 -07:00
md-multipath.c md: mark some personalities as deprecated 2021-06-14 22:32:07 -07:00
md-multipath.h
md.c md: fix a lock order reversal in md_alloc 2021-09-22 08:45:58 -07:00
md.h block: remove GENHD_FL_UP 2021-08-12 10:29:36 -06:00
raid0.c md: add io accounting for raid0 and raid5 2021-06-14 22:32:06 -07:00
raid0.h
raid1-10.c
raid1.c for-5.15/drivers-2021-08-30 2021-08-30 19:01:46 -07:00
raid1.h md/raid1: enable io accounting 2021-06-14 22:32:07 -07:00
raid5-cache.c block: rename BIO_MAX_PAGES to BIO_MAX_VECS 2021-03-11 07:47:48 -07:00
raid5-log.h
raid5-ppl.c block: rename BIO_MAX_PAGES to BIO_MAX_VECS 2021-03-11 07:47:48 -07:00
raid5.c md/raid5: Replace deprecated CPU-hotplug functions. 2021-08-28 01:46:17 +02:00
raid5.h md/raid5: let multiple devices of stripe_head share page 2020-09-24 16:44:44 -07:00
raid10.c for-5.15/drivers-2021-08-30 2021-08-30 19:01:46 -07:00
raid10.h md/raid10: enable io accounting 2021-06-14 22:32:07 -07:00