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Stefan Hajnoczi 1086e95da1 block/nvme: switch to a NVMeRequest freelist 
There are three issues with the current NVMeRequest->busy field:
1. The busy field is accidentally accessed outside q->lock when request
   submission fails.
2. Waiters on free_req_queue are not woken when a request is returned
   early due to submission failure.
2. Finding a free request involves scanning all requests. This makes
   request submission O(n^2).

Switch to an O(1) freelist that is always accessed under the lock.

Also differentiate between NVME_QUEUE_SIZE, the actual SQ/CQ size, and
NVME_NUM_REQS, the number of usable requests. This makes the code
simpler than using NVME_QUEUE_SIZE everywhere and having to keep in mind
that one slot is reserved.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
Message-id: 20200617132201.1832152-5-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2020-06-23 15:46:08 +01:00
..
monitor
blockdev: Split off basic bitmap operations for qemu-img
2020-05-19 10:32:14 -05:00
accounting.c
…
aio_task.c
…
backup-top.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
backup-top.h
…
backup.c
backup: Make sure that source and target size match
2020-05-08 13:26:35 +02:00
blkdebug.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
blklogwrites.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
blkreplay.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
blkverify.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
block-backend.c
block: Pass BdrvChildRole in remaining cases
2020-05-18 19:05:25 +02:00
block-copy.c
block/block-copy: Simplify block_copy_do_copy()
2020-05-18 19:05:25 +02:00
bochs.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
cloop.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
commit.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
copy-on-read.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
create.c
…
crypto.c
qcow2: Expose bitmaps' size during measure
2020-05-28 13:16:16 -05:00
crypto.h
…
curl.c
block/curl: HTTP header field names are case insensitive
2020-03-11 12:42:29 +01:00
dirty-bitmap.c
block/dirty-bitmap: add bdrv_has_named_bitmaps helper
2020-05-28 13:15:22 -05:00
dmg-bz2.c
…
dmg-lzfse.c
…
dmg.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
dmg.h
…
file-posix.c
block: Drop unused .bdrv_has_zero_init_truncate
2020-05-08 13:26:35 +02:00
file-win32.c
block: Drop unused .bdrv_has_zero_init_truncate
2020-05-08 13:26:35 +02:00
filter-compress.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
gluster.c
gluster: Drop useless has_zero_init callback
2020-05-08 13:26:35 +02:00
io_uring.c
io_uring: use io_uring_cq_ready() to check for ready cqes
2020-06-05 09:54:48 +01:00
io.c
block: Factor out bdrv_run_co()
2020-06-05 09:54:48 +01:00
iscsi-opts.c
…
iscsi.c
lockable: replaced locks with lock guard macros where appropriate
2020-05-04 16:07:43 +01:00
linux-aio.c
misc: Replace zero-length arrays with flexible array member (automatic)
2020-03-16 22:07:42 +01:00
Makefile.objs
block: Refactor subdirectory recursion during make
2020-06-17 14:53:39 +02:00
mirror.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
nbd.c
block: Call attention to truncation of long NBD exports
2020-06-10 12:58:59 -05:00
nfs.c
block: Drop unused .bdrv_has_zero_init_truncate
2020-05-08 13:26:35 +02:00
null.c
…
nvme.c
block/nvme: switch to a NVMeRequest freelist
2020-06-23 15:46:08 +01:00
parallels.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
parallels.h
…
qapi-sysemu.c
…
qapi.c
…
qcow2-bitmap.c
qcow2: Tweak comments on qcow2_get_persistent_dirty_bitmap_size
2020-06-17 14:53:39 +02:00
qcow2-cache.c
…
qcow2-cluster.c
qcow2: Support BDRV_REQ_ZERO_WRITE for truncate
2020-04-30 17:51:07 +02:00
qcow2-refcount.c
block: Comment cleanups
2020-05-05 13:17:36 +02:00
qcow2-snapshot.c
qcow2: Allow resize of images with internal snapshots
2020-05-05 13:17:36 +02:00
qcow2-threads.c
qcow2: add zstd cluster compression
2020-05-13 14:20:31 +02:00
qcow2.c
qcow2: Expose bitmaps' size during measure
2020-05-28 13:16:16 -05:00
qcow2.h
qcow2: Expose bitmaps' size during measure
2020-05-28 13:16:16 -05:00
qcow.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
qed-check.c
…
qed-cluster.c
…
qed-l2-cache.c
…
qed-table.c
…
qed.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
qed.h
…
quorum.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
raw-format.c
qcow2: Expose bitmaps' size during measure
2020-05-28 13:16:16 -05:00
rbd.c
block: Drop unused .bdrv_has_zero_init_truncate
2020-05-08 13:26:35 +02:00
replication.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
sheepdog.c
block: Drop unused .bdrv_has_zero_init_truncate
2020-05-08 13:26:35 +02:00
snapshot.c
…
ssh.c
block: Drop unused .bdrv_has_zero_init_truncate
2020-05-08 13:26:35 +02:00
stream.c
…
throttle-groups.c
qom: Drop parameter @errp of object_property_add() & friends
2020-05-15 07:07:58 +02:00
throttle.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
trace-events
block/block-copy: use block_status
2020-03-11 12:42:30 +01:00
vdi.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
vhdx-endian.c
…
vhdx-log.c
block: Add flags to bdrv(_co)_truncate()
2020-04-30 17:51:07 +02:00
vhdx.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
vhdx.h
…
vmdk.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
vpc.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
vvfat.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
vxhs.c
…
win32-aio.c
…
write-threshold.c
…