Eric Blake dbc7b01492 nbd: Add 'qemu-nbd -A' to expose allocation depth ... Allow the server to expose an additional metacontext to be requested by savvy clients. qemu-nbd adds a new option -A to expose the qemu:allocation-depth metacontext through NBD_CMD_BLOCK_STATUS; this can also be set via QMP when using block-export-add. qemu as client is hacked into viewing the key aspects of this new context by abusing the already-experimental x-dirty-bitmap option to collapse all depths greater than 2, which results in a tri-state value visible in the output of 'qemu-img map --output=json' (yes, that means x-dirty-bitmap is now a bit of a misnomer, but I didn't feel like renaming it as it would introduce a needless break of back-compat, even though we make no compat guarantees with x- members): unallocated (depth 0) => "zero":false, "data":true local (depth 1) => "zero":false, "data":false backing (depth 2+) => "zero":true, "data":true libnbd as client is probably a nicer way to get at the information without having to decipher such hacks in qemu as client. ;) Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20201027050556.269064-11-eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>		2020-10-30 15:22:00 -05:00
..
export	block/export: add vhost-user-blk multi-queue support	2020-10-23 13:42:16 +01:00
monitor	block/export: Add block-export-del	2020-10-02 15:46:40 +02:00
accounting.c	block: add empty account cookie type	2019-10-10 10:56:18 +02:00
aio_task.c	block: introduce aio task pool	2019-10-10 10:56:17 +02:00
amend.c	block/amend: Check whether the node exists	2020-07-27 12:37:25 +02:00
backup-top.c	block: Inline bdrv_co_block_status_from_*()	2020-09-07 12:31:31 +02:00
backup-top.h	block: introduce backup-top filter driver	2019-10-10 10:56:18 +02:00
backup.c	backup: Deal with filters	2020-09-07 12:31:31 +02:00
blkdebug.c	block/blkdebug: fix memory leak	2020-10-13 13:33:46 +02:00
blklogwrites.c	block: Inline bdrv_co_block_status_from_*()	2020-09-07 12:31:31 +02:00
blkreplay.c	block: Use bdrv_default_perms()	2020-05-18 19:05:25 +02:00
blkverify.c	error: Eliminate error_propagate() with Coccinelle, part 2	2020-07-10 15:18:08 +02:00
block-backend.c	qemu/atomic.h: rename atomic_ to qatomic_	2020-09-23 16:07:44 +01:00
block-copy.c	block-copy: Use CAF to find sync=top base	2020-09-07 12:31:31 +02:00
block-gen.h	scripts: add block-coroutine-wrapper.py	2020-10-05 10:59:06 +01:00
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: Return depth level during bdrv_is_allocated_above	2020-10-30 15:21:23 -05:00
copy-on-read.c	block: Inline bdrv_co_block_status_from_*()	2020-09-07 12:31:31 +02:00
coroutines.h	block: Return depth level during bdrv_is_allocated_above	2020-10-30 15:21:23 -05:00
create.c	block/create: Do not abort if a block driver is not available	2019-09-13 12:18:37 +02:00
crypto.c	block/crypto: disallow write sharing by default	2020-07-21 10:49:02 +02:00
crypto.h	block/crypto: implement the encryption key management	2020-07-06 08:49:28 +02:00
curl.c	error: Eliminate error_propagate() with Coccinelle, part 1	2020-07-10 15:18:08 +02:00
dirty-bitmap.c	block/dirty-bitmap: add bdrv_has_named_bitmaps helper	2020-05-28 13:15:22 -05:00
dmg-bz2.c	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
dmg-lzfse.c
dmg.c	block: Use bdrv_default_perms()	2020-05-18 19:05:25 +02:00
dmg.h	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
file-posix.c	block/file: switch to use qemu_open/qemu_create for improved errors	2020-09-16 10:33:48 +01:00
file-win32.c	block/file: switch to use qemu_open/qemu_create for improved errors	2020-09-16 10:33:48 +01:00
filter-compress.c	block: Inline bdrv_co_block_status_from_*()	2020-09-07 12:31:31 +02:00
gluster.c	error: Reduce unnecessary error propagation	2020-07-10 15:18:08 +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: Return depth level during bdrv_is_allocated_above	2020-10-30 15:21:23 -05:00
iscsi-opts.c
iscsi.c	qapi: Restrict query-uuid command to machine code	2020-09-29 15:41:35 +02:00
linux-aio.c	misc: Replace zero-length arrays with flexible array member (automatic)	2020-03-16 22:07:42 +01:00
meson.build	block/export: convert vhost-user-blk server to block export API	2020-10-23 13:42:16 +01:00
mirror.c	block: Return depth level during bdrv_is_allocated_above	2020-10-30 15:21:23 -05:00
nbd.c	nbd: Add 'qemu-nbd -A' to expose allocation depth	2020-10-30 15:22:00 -05:00
nfs.c	qemu/atomic.h: rename atomic_ to qatomic_	2020-09-23 16:07:44 +01:00
null.c	block/null: Implement bdrv_get_allocated_file_size	2020-09-07 12:31:31 +02:00
nvme.c	block/nvme: Add driver statistics for access alignment and hw errors	2020-10-23 13:42:16 +01:00
parallels.c	error: Avoid error_propagate() after migrate_add_blocker()	2020-07-10 15:18:08 +02:00
parallels.h
qapi-sysemu.c	block: Move system emulator QMP commands to block/qapi-sysemu.c	2020-03-06 17:15:38 +01:00
qapi.c	migration: introduce icount field for snapshots	2020-10-06 08:34:49 +02:00
qcow2-bitmap.c	qcow2: Use macros for the L1, refcount and bitmap table entry sizes	2020-09-15 11:05:12 +02:00
qcow2-cache.c	core: replace getpagesize() with qemu_real_host_page_size	2019-10-26 15:38:06 +02:00
qcow2-cluster.c	qcow2: Use L1E_SIZE in qcow2_write_l1_entry()	2020-10-02 15:46:40 +02:00
qcow2-refcount.c	qcow2: Make qcow2_free_any_clusters() free only one cluster	2020-09-15 11:05:13 +02:00
qcow2-snapshot.c	migration: introduce icount field for snapshots	2020-10-06 08:34:49 +02:00
qcow2-threads.c	qcow2: add zstd cluster compression	2020-05-13 14:20:31 +02:00
qcow2.c	qcow2: Skip copy-on-write when allocating a zero cluster	2020-10-27 15:26:20 +01:00
qcow2.h	qcow2: introduce icount field for snapshots	2020-10-06 08:34:49 +02:00
qcow.c	block/qcow: remove runtime opts	2020-09-15 11:05:13 +02:00
qed-check.c
qed-cluster.c
qed-l2-cache.c
qed-table.c
qed.c	qapi: Smooth another visitor error checking pattern	2020-07-10 15:18:08 +02:00
qed.h	qed: Simplify backing reads	2020-07-06 10:34:14 +02:00
quorum.c	block/quorum.c: stable children names	2020-09-15 11:05:12 +02:00
raw-format.c	error: Eliminate error_propagate() with Coccinelle, part 2	2020-07-10 15:18:08 +02:00
rbd.c	block/rbd: add 'namespace' to qemu_rbd_strong_runtime_opts[]	2020-09-15 11:31:10 +02:00
replication.c	error: Reduce unnecessary error propagation	2020-07-10 15:18:08 +02:00
sheepdog.c	block: deprecate the sheepdog block driver	2020-10-15 16:06:28 +02:00
snapshot.c	block/snapshot: Fix fallback	2020-09-07 12:31:31 +02:00
ssh.c	qapi: Smooth another visitor error checking pattern	2020-07-10 15:18:08 +02:00
stream.c	block: Return depth level during bdrv_is_allocated_above	2020-10-30 15:21:23 -05:00
throttle-groups.c	qemu/atomic.h: rename atomic_ to qatomic_	2020-09-23 16:07:44 +01:00
throttle.c	qemu/atomic.h: rename atomic_ to qatomic_	2020-09-23 16:07:44 +01:00
trace-events	trace-events: Fix attribution of trace points to source	2020-09-09 17:17:58 +01:00
trace.h	trace: switch position of headers to what Meson requires	2020-08-21 06:18:24 -04:00
vdi.c	error: Avoid error_propagate() after migrate_add_blocker()	2020-07-10 15:18:08 +02:00
vhdx-endian.c	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
vhdx-log.c	block: Add flags to bdrv(_co)_truncate()	2020-04-30 17:51:07 +02:00
vhdx.c	block/vhdx: Support vhdx image only with 512 bytes logical sector size	2020-09-15 11:05:13 +02:00
vhdx.h
vmdk.c	vmdk: fix maybe uninitialized warnings	2020-10-13 13:33:45 +02:00
vpc.c	error: Avoid error_propagate() after migrate_add_blocker()	2020-07-10 15:18:08 +02:00
vvfat.c	util: rename qemu_open() to qemu_open_old()	2020-09-16 10:33:48 +01:00
win32-aio.c
write-threshold.c