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Eric Blake 5c86bdf120 block: Call attention to truncation of long NBD exports 
Commit 93676c88 relaxed our NBD client code to request export names up
to the NBD protocol maximum of 4096 bytes without NUL terminator, even
though the block layer can't store anything longer than 4096 bytes
including NUL terminator for display to the user.  Since this means
there are some export names where we have to truncate things, we can
at least try to make the truncation a bit more obvious for the user.
Note that in spite of the truncated display name, we can still
communicate with an NBD server using such a long export name; this was
deemed nicer than refusing to even connect to such a server (since the
server may not be under our control, and since determining our actual
length limits gets tricky when nbd://host:port/export and
nbd+unix:///export?socket=/path are themselves variable-length
expansions beyond the export name but count towards the block layer
name length).

Reported-by: Xueqiang Wei <xuwei@redhat.com>
Fixes: https://bugzilla.redhat.com/1843684
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200610163741.3745251-3-eblake@redhat.com>
 		2020-06-10 12:58:59 -05:00
..
monitor blockdev: Split off basic bitmap operations for qemu-img 2020-05-19 10:32:14 -05:00
Makefile.objs monitor/hmp: rename device-hotplug.c to block/monitor/block-hmp-cmds.c 2020-03-09 18:05:31 +00:00
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
backup-top.c block: Drop @child_class from bdrv_child_perm() 2020-05-18 19:05:25 +02:00
backup-top.h block: introduce backup-top filter driver 2019-10-10 10:56:18 +02:00
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 block/create: Do not abort if a block driver is not available 2019-09-13 12:18:37 +02:00
crypto.c qcow2: Expose bitmaps' size during measure 2020-05-28 13:16:16 -05:00
crypto.h Clean up ill-advised or unusual header guards 2019-05-13 08:58:55 +02:00
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 Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
dmg-lzfse.c block: adding lzfse decompressing support as a module. 2018-12-14 11:52:40 +01:00
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: 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.c block: Factor out bdrv_run_co() 2020-06-05 09:54:48 +01:00
io_uring.c io_uring: use io_uring_cq_ready() to check for ready cqes 2020-06-05 09:54:48 +01:00
iscsi-opts.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
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
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 replay: add BH oneshot event for block layer 2019-10-14 17:12:48 +02:00
nvme.c Compress lines for immediate return 2020-05-04 14:43:22 +02:00
parallels.c block: Use bdrv_default_perms() 2020-05-18 19:05:25 +02:00
parallels.h Clean up includes 2018-02-09 05:05:11 +01:00
qapi-sysemu.c block: Move system emulator QMP commands to block/qapi-sysemu.c 2020-03-06 17:15:38 +01:00
qapi.c block: Fix VM size field width in snapshot dump 2020-02-20 16:43:42 +01:00
qcow.c block: Use bdrv_default_perms() 2020-05-18 19:05:25 +02:00
qcow2-bitmap.c qcow2: Expose bitmaps' size during measure 2020-05-28 13:16:16 -05:00
qcow2-cache.c core: replace getpagesize() with qemu_real_host_page_size 2019-10-26 15:38:06 +02:00
qcow2-cluster.c qcow2: 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
qed-check.c block/qed: add missed coroutine_fn markers 2019-04-30 15:29:00 +02:00
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/qed: add missed coroutine_fn markers 2019-04-30 15:29:00 +02:00
qed.c block: Use bdrv_default_perms() 2020-05-18 19:05:25 +02:00
qed.h block/qed: add missed coroutine_fn markers 2019-04-30 15:29:00 +02:00
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 block/snapshot: rename Error ** parameter to more common errp 2019-12-18 08:43:19 +01:00
ssh.c block: Drop unused .bdrv_has_zero_init_truncate 2020-05-08 13:26:35 +02:00
stream.c block/stream: Remove redundant statement in stream_run() 2020-03-09 15:59:31 +01:00
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 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: Use bdrv_default_perms() 2020-05-18 19:05:25 +02:00
vhdx.h block/vhdx: Use IEC binary prefixes for size constants 2019-04-30 15:29:00 +02:00
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 replay: add BH oneshot event for block layer 2019-10-14 17:12:48 +02:00
win32-aio.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
write-threshold.c qapi: Drop qapi_event_send_FOO()'s Error ** argument 2018-08-28 18:21:38 +02:00