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67b24427fe
qemu/block
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Alberto Garcia 67b24427fe mirror: Block the source BlockDriverState in mirror_start_job() 
The mirror_start_job() function used for the commit-active job blocks
the source, target and all intermediate nodes for the duration of the
job.

   target <- intermediate <- source

Since 4ef85a9c23 this function creates a dummy mirror_top_bs that
goes on top of the source node, and it is this dummy node that gets
blocked instead. The source node is never blocked or added to the
job's list of nodes.

   target <- intermediate <- source <- mirror_top

At the moment I don't think it is possible to exploit this problem
because any additional job on 'source' would either be forbidden for
other reasons or it would need to involve an additional node that is
blocked, causing an error.

This can be seen in the error messages, however, because they never
refer to the source node being blocked:

  $ qemu-img create -f qcow2 hd0.qcow2 1M
  $ qemu-img create -f qcow2 -b hd0.qcow2 hd1.qcow2
  $ qemu-io -c 'write 0 1M' hd0.qcow2
  $ $QEMU -drive if=none,file=hd1.qcow2,node-name=hd1
  { "execute": "qmp_capabilities" }
  { "execute": "block-commit", "arguments": {"device": "hd1", "speed": 256}}
  { "execute": "block-stream", "arguments": {"device": "hd1"}}
  { "error": {"class": "GenericError",
    "desc": "Node 'hd0' is busy: block device is in use by block job: commit"}}

After this patch the error message refers to 'hd1', as it should.

The expected output of iotest 141 also needs to be updated for the
same reason.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2019-02-01 13:46:44 +01:00
..
accounting.c block/accounting: introduce latency histogram 2018-03-19 14:58:37 -05:00
backup.c Revert "hbitmap: Add @advance param to hbitmap_iter_next()" 2019-01-15 18:26:50 -05:00
blkdebug.c qstring: Move qstring_from_substr()'s @end one to the right 2018-07-28 09:09:58 +02:00
blklogwrites.c block: Use BdrvChild to discard 2018-07-10 16:01:52 +02:00
blkreplay.c trivial: Make bios files and source files non-executable 2018-09-25 17:26:18 +02:00
blkverify.c qstring: Move qstring_from_substr()'s @end one to the right 2018-07-28 09:09:58 +02:00
block-backend.c qapi: add x-debug-query-block-graph 2019-01-31 00:38:19 +01:00
bochs.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
cloop.c block: Require auto-read-only for existing fallbacks 2018-11-05 15:09:55 +01:00
commit.c block: Use bdrv_reopen_set_read_only() in bdrv_commit() 2018-12-14 11:55:01 +01:00
copy-on-read.c block: drop empty .bdrv_close handlers 2018-08-15 12:50:39 +02:00
create.c jobs: utilize job_exit shim 2018-08-31 16:28:33 +02:00
crypto.c crypto: support multiple threads accessing one QCryptoBlock 2018-12-12 11:16:49 +00:00
crypto.h block/crypto: Simplify block_crypto_{open,create}_opts_init() 2018-06-29 14:20:56 +02:00
curl.c block/curl: Convert from DPRINTF() macro to trace events 2019-01-31 00:38:19 +01:00
dirty-bitmap.c Revert "hbitmap: Add @advance param to hbitmap_iter_next()" 2019-01-15 18:26:50 -05:00
dmg-bz2.c dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
dmg-lzfse.c block: adding lzfse decompressing support as a module. 2018-12-14 11:52:40 +01:00
dmg.c dmg: don't skip zero chunk 2019-01-04 11:15:09 +00:00
dmg.h dmg: including dmg-lzfse module inside dmg block driver. 2018-12-14 11:52:40 +01:00
file-posix.c block/file-posix: Convert from DPRINTF() macro to trace events 2019-01-31 00:38:19 +01:00
file-win32.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
gluster.c qemu/queue.h: leave head structs anonymous unless necessary 2019-01-11 15:46:55 +01:00
io.c block: Use a single global AioWait 2018-09-25 15:50:15 +02:00
iscsi-opts.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
iscsi.c block: Work-around a bug in libiscsi 1.9.0 when used in gnu99 mode 2019-01-22 06:26:32 +01:00
linux-aio.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
Makefile.objs configure: adding support to lzfse library. 2018-12-14 11:52:40 +01:00
mirror.c mirror: Block the source BlockDriverState in mirror_start_job() 2019-02-01 13:46:44 +01:00
nbd-client.c nbd/client: Change signature of nbd_negotiate_simple_meta_context() 2019-01-21 15:49:52 -06:00
nbd-client.h nbd/client: Add x-dirty-bitmap to query bitmap from server 2018-07-02 15:27:38 -05:00
nbd.c qstring: Move qstring_from_substr()'s @end one to the right 2018-07-28 09:09:58 +02:00
nfs.c block: Convert .bdrv_truncate callback to coroutine_fn 2018-06-29 14:20:56 +02:00
null.c block: drop empty .bdrv_close handlers 2018-08-15 12:50:39 +02:00
nvme.c block/nvme: optimize the performance of nvme driver based on vfio-pci 2019-01-09 09:38:34 +08:00
parallels.c parallels: Switch to byte-based calls 2018-06-29 14:20:56 +02:00
parallels.h Clean up includes 2018-02-09 05:05:11 +01:00
qapi.c block/qapi: Fix memory leak in qmp_query_blockstats() 2018-08-15 12:50:39 +02:00
qcow2-bitmap.c qemu/queue.h: leave head structs anonymous unless necessary 2019-01-11 15:46:55 +01:00
qcow2-cache.c qcow2: Allow configuring the L2 slice size 2018-02-13 17:00:00 +01:00
qcow2-cluster.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
qcow2-refcount.c qcow2: Don't allow overflow during cluster allocation 2018-11-19 12:51:40 +01:00
qcow2-snapshot.c block: use local path for local headers 2018-05-31 04:16:06 +03:00
qcow2.c qcow2: do decompression in threads 2018-12-14 11:52:41 +01:00
qcow2.h qemu/queue.h: leave head structs anonymous unless necessary 2019-01-11 15:46:55 +01:00
qcow.c crypto: support multiple threads accessing one QCryptoBlock 2018-12-12 11:16:49 +00:00
qed-check.c block: convert bdrv_check callback to coroutine_fn 2018-03-09 15:17:47 +01:00
qed-cluster.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed-l2-cache.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed-table.c block: convert bdrv_check callback to coroutine_fn 2018-03-09 15:17:47 +01:00
qed.c error: Fix use of error_prepend() with &error_fatal, &error_abort 2018-10-19 14:51:34 +02:00
qed.h qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
quorum.c quorum: Forbid adding children in blkverify mode 2018-11-05 15:09:54 +01:00
raw-format.c block: drop empty .bdrv_close handlers 2018-08-15 12:50:39 +02:00
rbd.c block: Require auto-read-only for existing fallbacks 2018-11-05 15:09:55 +01:00
replication.c block: Remove flags parameter from bdrv_reopen_queue() 2018-12-14 11:55:02 +01:00
sheepdog.c block/sheepdog: Convert from DPRINTF() macro to trace events 2019-01-31 00:38:19 +01:00
snapshot.c block: make .bdrv_close optional 2018-08-15 12:50:39 +02:00
ssh.c block/ssh: Convert from DPRINTF() macro to trace events 2019-01-31 00:38:19 +01:00
stream.c block: Use bdrv_reopen_set_read_only() in stream_start/complete() 2018-12-14 11:55:02 +01:00
throttle-groups.c throttle-groups: fix restart coroutine iothread race 2019-01-24 10:02:28 +00:00
throttle.c block: Use BdrvChild to discard 2018-07-10 16:01:52 +02:00
trace-events block/sheepdog: Convert from DPRINTF() macro to trace events 2019-01-31 00:38:19 +01:00
vdi.c vdi: Use a literal number of bytes for DEFAULT_CLUSTER_SIZE 2018-11-05 15:28:48 +01:00
vhdx-endian.c block/vhdx: Don't take address of fields in packed structs 2018-11-05 15:09:54 +01:00
vhdx-log.c block/vhdx: Don't take address of fields in packed structs 2018-11-05 15:09:54 +01:00
vhdx.c block/vhdx: Don't take address of fields in packed structs 2018-11-05 15:09:54 +01:00
vhdx.h qemu/queue.h: leave head structs anonymous unless necessary 2019-01-11 15:46:55 +01:00
vmdk.c vmdk: align end of file to a sector boundary 2018-09-26 10:47:18 +08:00
vpc.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
vvfat.c vvfat: Fix memory leak 2018-11-19 12:51:40 +01:00
vxhs.c block: Add block-specific QDict header 2018-06-15 14:49:44 +02:00
win32-aio.c file-win32: Switch to byte-based callbacks 2018-05-15 16:11:41 +02:00
write-threshold.c qapi: Drop qapi_event_send_FOO()'s Error ** argument 2018-08-28 18:21:38 +02:00