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b33b6fdca3
linux/drivers/md
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Mike Snitzer b33b6fdca3 dm bufio: simplify DM_BUFIO_CLIENT_NO_SLEEP locking 
Historically none of the bufio code runs in interrupt context but with
the use of DM_BUFIO_CLIENT_NO_SLEEP a bufio client can, see: commit
5721d4e5a9 ("dm verity: Add optional "try_verify_in_tasklet" feature")
That said, the new tasklet usecase still doesn't require interrupts be
disabled by bufio (let alone conditionally restore them).

Yet with PREEMPT_RT, and falling back from tasklet to workqueue, care
must be taken to properly synchronize between softirq and process
context, otherwise ABBA deadlock may occur. While it is unnecessary to
disable bottom-half preemption within a tasklet, we must consistently do
so in process context to ensure locking is in the proper order.

Fix these issues by switching from spin_lock_irq{save,restore} to using
spin_{lock,unlock}_bh instead. Also remove the 'spinlock_flags' member
in dm_bufio_client struct (that can be used unsafely if bufio must
recurse on behalf of some caller, e.g. block layer's submit_bio).

Fixes: 5721d4e5a9 ("dm verity: Add optional "try_verify_in_tasklet" feature")
Reported-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2022-08-09 19:12:14 -04:00
..
bcache block: remove blk_cleanup_disk 2022-06-28 06:33:15 -06:00
persistent-data dm bufio: Add flags argument to dm_bufio_client_create 2022-07-28 17:46:14 -04:00
dm-audit.c dm: introduce audit event module for device mapper 2021-10-27 16:53:47 -04:00
dm-audit.h dm: introduce audit event module for device mapper 2021-10-27 16:53:47 -04:00
dm-bio-prison-v1.c
dm-bio-prison-v1.h
dm-bio-prison-v2.c
dm-bio-prison-v2.h
dm-bio-record.h block: move integrity handling out of <linux/blkdev.h> 2021-10-18 06:17:02 -06:00
dm-bufio.c dm bufio: simplify DM_BUFIO_CLIENT_NO_SLEEP locking 2022-08-09 19:12:14 -04:00
dm-builtin.c
dm-cache-background-tracker.c
dm-cache-background-tracker.h
dm-cache-block-types.h
dm-cache-metadata.c dm cache metadata: remove unnecessary variable in __dump_mapping 2022-05-09 15:40:10 -04:00
dm-cache-metadata.h dm cache: fix typo in 2 comment blocks 2022-07-07 11:49:37 -04:00
dm-cache-policy-internal.h
dm-cache-policy-smq.c dm cache policy smq: make static read-only array table const 2022-02-22 10:35:53 -05:00
dm-cache-policy.c
dm-cache-policy.h
dm-cache-target.c dm cache: fix typo in 2 comment blocks 2022-07-07 11:49:37 -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-target.c block: remove QUEUE_FLAG_DISCARD 2022-04-17 19:49:59 -06:00
dm-core.h dm table: audit all dm_table_get_target() callers 2022-07-07 11:49:34 -04:00
dm-crypt.c dm crypt: make printing of the key constant-time 2022-05-09 12:34:03 -04:00
dm-delay.c dm: simplify basic targets 2022-05-05 17:31:35 -04:00
dm-dust.c dm: use bdev_nr_sectors and bdev_nr_bytes instead of open coding them 2021-10-18 14:43:22 -06:00
dm-ebs-target.c dm bufio: Add flags argument to dm_bufio_client_create 2022-07-28 17:46:14 -04:00
dm-era-target.c dm era: commit metadata in postsuspend after worker stops 2022-06-21 13:35:01 -04:00
dm-exception-store.c
dm-exception-store.h dm: use bdev_nr_sectors and bdev_nr_bytes instead of open coding them 2021-10-18 14:43:22 -06:00
dm-flakey.c dm: simplify basic targets 2022-05-05 17:31:35 -04:00
dm-ima.c dm table: audit all dm_table_get_target() callers 2022-07-07 11:49:34 -04:00
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-integrity.c dm bufio: Add flags argument to dm_bufio_client_create 2022-07-28 17:46:14 -04:00
dm-io-rewind.c dm: add two stage requeue mechanism 2022-07-07 11:49:32 -04:00
dm-io-tracker.h dm writecache: make writeback pause configurable 2021-06-28 16:30:13 -04:00
dm-io.c block: add a bdev_max_discard_sectors helper 2022-04-17 19:49:59 -06:00
dm-ioctl.c dm table: remove dm_table_get_num_targets() wrapper 2022-07-07 11:49:33 -04:00
dm-kcopyd.c dm kcopyd: use __GFP_HIGHMEM when allocating pages 2022-07-14 15:52:31 -04:00
dm-linear.c libnvdimm for 5.19 2022-05-27 15:49:30 -07:00
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 libnvdimm for 5.19 2022-05-27 15:49:30 -07:00
dm-log.c dm mirror log: clear log bits up to BITS_PER_LONG boundary 2022-06-23 14:55:43 -04:00
dm-mpath.c dm mpath: provide high-resolution timer to HST for bio-based 2022-05-09 15:39:23 -04:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h dm mpath: provide high-resolution timer to HST for bio-based 2022-05-09 15:39:23 -04:00
dm-ps-historical-service-time.c dm mpath: provide high-resolution timer to HST for bio-based 2022-05-09 15:39:23 -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: fix dm-raid crash if md_handle_request() splits bio 2022-07-28 17:36:30 -04:00
dm-region-hash.c
dm-rq.c dm: unexport dm_get_reserved_rq_based_ios 2022-06-29 12:46:05 -04:00
dm-rq.h
dm-snap-persistent.c dm bufio: Add flags argument to dm_bufio_client_create 2022-07-28 17:46:14 -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 snapshot: fix typo in snapshot_map() comment 2022-07-07 11:49:39 -04:00
dm-stats.c dm stats: add cond_resched when looping over entries 2022-05-09 12:11:07 -04:00
dm-stats.h dm stats: fix too short end duration_ns when using precise_timestamps 2022-02-21 15:35:39 -05:00
dm-stripe.c dax: add .recovery_write dax_operation 2022-05-16 13:37:59 -07:00
dm-switch.c dm: use bdev_nr_sectors and bdev_nr_bytes instead of open coding them 2021-10-18 14:43:22 -06:00
dm-sysfs.c dm sysfs: use default_groups in kobj_type 2022-01-06 09:48:55 -05:00
dm-table.c dm table: rename dm_target variable in dm_table_add_target() 2022-07-07 11:49:35 -04:00
dm-target.c dax: introduce DAX_RECOVERY_WRITE dax access mode 2022-05-16 13:35:56 -07:00
dm-thin-metadata.c dm thin: fix use-after-free crash in dm_sm_register_threshold_callback 2022-07-15 18:09:14 -04:00
dm-thin-metadata.h dm thin metadata: remove unused dm_thin_remove_block and __remove 2022-02-22 13:55:50 -05:00
dm-thin.c dm thin: fix use-after-free crash in dm_sm_register_threshold_callback 2022-07-15 18:09:14 -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 bufio: Add flags argument to dm_bufio_client_create 2022-07-28 17:46:14 -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 verity: have verify_wq use WQ_HIGHPRI if "try_verify_in_tasklet" 2022-08-04 15:59:52 -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.h dm verity: Add optional "try_verify_in_tasklet" feature 2022-08-04 13:50:40 -04:00
dm-writecache.c dm writecache: count number of blocks discarded, not number of discard bios 2022-07-14 15:54:46 -04:00
dm-zero.c
dm-zone.c dm table: audit all dm_table_get_target() callers 2022-07-07 11:49:34 -04:00
dm-zoned-metadata.c dm-zoned: remove the ->name field in struct dmz_dev 2022-03-02 12:15:35 -05:00
dm-zoned-reclaim.c dm kcopyd: avoid useless atomic operations 2021-06-04 12:07:24 -04:00
dm-zoned-target.c dm-zoned: don't set the discard_alignment queue limit 2022-05-03 10:38:50 -06:00
dm-zoned.h dm-zoned: remove the ->name field in struct dmz_dev 2022-03-02 12:15:35 -05:00
dm.c dm: fix dm-raid crash if md_handle_request() splits bio 2022-07-28 17:36:30 -04:00
dm.h dm table: audit all dm_table_get_target() callers 2022-07-07 11:49:34 -04:00
Kconfig blk-mq: make the blk-mq stacking code optional 2022-02-16 19:39:09 -07:00
Makefile dm: add dm_bio_rewind() API to DM core 2022-07-07 11:26:55 -04:00
md-autodetect.c
md-bitmap.c md: replace deprecated strlcpy & remove duplicated line 2022-04-25 14:00:36 -07:00
md-bitmap.h
md-cluster.c md: replace deprecated strlcpy & remove duplicated line 2022-04-25 14:00:36 -07:00
md-cluster.h
md-faulty.c block: pass a block_device to bio_clone_fast 2022-02-04 07:43:18 -07:00
md-linear.c md: remove most calls to bdevname 2022-05-22 23:07:21 -07:00
md-linear.h
md-multipath.c md: remove most calls to bdevname 2022-05-22 23:07:21 -07:00
md-multipath.h
md.c block: remove blk_cleanup_disk 2022-06-28 06:33:15 -06:00
md.h Revert "md: don't unregister sync_thread with reconfig_mutex held" 2022-06-15 10:30:14 -07:00
raid0.c md: Don't set mddev private to NULL in raid0 pers->free 2022-05-22 23:07:21 -07:00
raid0.h
raid1-10.c md: raid1/raid10: drop pending_cnt 2022-03-08 15:16:54 -08:00
raid1.c md: remove most calls to bdevname 2022-05-22 23:07:21 -07:00
raid1.h md: raid1/raid10: drop pending_cnt 2022-03-08 15:16:54 -08:00
raid5-cache.c md: remove most calls to bdevname 2022-05-22 23:07:21 -07:00
raid5-log.h
raid5-ppl.c md/raid5-ppl: Fix argument order in bio_alloc_bioset() 2022-06-15 10:32:48 -07:00
raid5.c md: remove most calls to bdevname 2022-05-22 23:07:21 -07:00
raid5.h md/raid5: Add __rcu annotation to struct disk_info 2022-04-25 14:00:36 -07:00
raid10.c md: remove most calls to bdevname 2022-05-22 23:07:21 -07:00
raid10.h md: raid1/raid10: drop pending_cnt 2022-03-08 15:16:54 -08:00