linux-stable/drivers/block
Ilya Dryomov 637cd06053 rbd: new exclusive lock wait/wake code
rbd_wait_state_locked() is built around rbd_dev->lock_waitq and blocks
rbd worker threads while waiting for the lock, potentially impacting
other rbd devices.  There is no good way to pass an error code into
image request state machines when acquisition fails, hence the use of
RBD_DEV_FLAG_BLACKLISTED for everything and various other issues.

Introduce rbd_dev->acquiring_list and move acquisition into image
request state machine.  Use rbd_img_schedule() for kicking and passing
error codes.  No blocking occurs while waiting for the lock, but
rbd_dev->lock_rwsem is still held across lock, unlock and set_cookie
calls.

Always acquire the lock on "rbd map" to avoid associating the latency
of acquiring the lock with the first I/O request.

A slight regression is that lock_timeout is now respected only if lock
acquisition is triggered by "rbd map" and not by I/O.  This is somewhat
compensated by the fact that we no longer block if the peer refuses to
release lock -- I/O is failed with EROFS right away.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Dongsheng Yang <dongsheng.yang@easystack.cn>
2019-07-08 14:01:45 +02:00
..
aoe block: aoe: no need to check return value of debugfs_create functions 2019-06-04 13:38:23 -06:00
drbd treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 91 2019-05-24 17:37:53 +02:00
mtip32xx mtip32xx: also set max_segment_size in the device 2019-06-05 13:18:39 -06:00
paride Linux 5.1-rc6 2019-04-22 09:47:36 -06:00
rsxx rsxx: don't call dma_set_max_seg_size 2019-06-05 13:18:39 -06:00
xen-blkback treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
zram treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
amiflop.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
ataflop.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
brd.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
cryptoloop.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 30 2019-05-24 17:27:10 +02:00
floppy.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
Kconfig drivers/block: Remove DAC960 driver 2018-10-17 09:42:30 -06:00
loop.c loop: Don't change loop device under exclusive opener 2019-05-27 07:34:04 -06:00
loop.h block/loop: Use global lock for ioctl() operation. 2018-11-08 06:30:11 -07:00
Makefile drivers/block: Remove DAC960 driver 2018-10-17 09:42:30 -06:00
nbd.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 127 2019-05-30 11:25:13 -07:00
null_blk.h null_blk: add zoned config support information 2019-01-06 10:58:27 -07:00
null_blk_main.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
null_blk_zoned.c null_blk: remove duplicate check for report zone 2019-06-13 03:00:30 -06:00
pktcdvd.c block: genhd: remove async_events field 2019-04-12 13:35:22 -06:00
ps3disk.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 164 2019-05-30 11:26:38 -07:00
ps3vram.c block/ps3vram: Use %llu to format sector_t after LBDAF removal 2019-06-13 03:17:50 -06:00
rbd.c rbd: new exclusive lock wait/wake code 2019-07-08 14:01:45 +02:00
rbd_types.h
skd_main.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 497 2019-06-19 17:09:53 +02:00
skd_s1120.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 497 2019-06-19 17:09:53 +02:00
sunvdc.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
swim.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
swim3.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
swim_asm.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
sx8.c sx8: use a per-host tag_set 2018-11-09 08:14:14 -07:00
umem.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 349 2019-06-05 17:37:08 +02:00
umem.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 348 2019-06-05 17:37:08 +02:00
virtio_blk.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
xen-blkfront.c xen-blkfront: switch kcalloc to kvcalloc for large array allocation 2019-06-03 22:16:19 -04:00
xsysace.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
z2ram.c powerpc updates for 4.20 2018-10-26 14:36:21 -07:00