This simplifies a bit the code by using the usual C "inclusive start,
exclusive end" pattern for ranges.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1475685327-22767-2-git-send-email-pbonzini@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
In 27ccdd5259 the throttling fields were
moved from BlockDriverState to BlockBackend. However in a few cases
the code started using throttling fields from the active BlockBackend
instead of the round-robin token, making the algorithm behave
incorrectly.
This can cause starvation if there's a throttling group with several
drives but only one of them has I/O.
Cc: qemu-stable@nongnu.org
Reported-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
The 'obj' result of the visitor was not properly freed, like done in
other places doing a similar job.
Signed-off-by: Pino Toscano <ptoscano@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Make raw_open for POSIX more consistent in handling errors by setting
the error object also when qemu_open fails. The error object was set
generally set in case of errors, but I guess this case was overlooked.
Do the same for win32.
Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Reviewed-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Tested-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com> (POSIX only)
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Handling this is similar to what is done to the L2 entry in the case of
compressed clusters.
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
iSER is a new transport layer supported in Libiscsi,
iSER provides a zero-copy RDMA capable interface that can
improve performance.
In order to use the new iSER transport one need to have RDMA supported HW
and to choose iser as the protocol name in Libiscsi URI.
For now iSER memory buffers are pre-allocated and pre-registered,
hence in order to work with iSER from QEMU, one need to enable
MEMLOCK attribute in the VM to be large enough for all iSER buffers and RDMA
resources.
Signed-off-by: Roy Shterman <roysh@mellanox.com>
Message-Id: <1476000896-18632-3-git-send-email-roysh@mellanox.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
A new API to deploy zero-copy command submission. The new API takes I/O
vectors list and number of I/O vectors to submit as input parameters
when initiating the command. New API must be used if working with
iSER transport option.
Signed-off-by: Roy Shterman <roysh@mellanox.com>
Message-Id: <1476000896-18632-2-git-send-email-roysh@mellanox.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Otherwise, reads of more than 2GB fail. Until commit
7bbca9e290, reads of 2^41
bytes succeeded at least theoretically.
In fact, pdiscard ought to receive a 64-bit integer as the
count for the same reason.
Reported by Coverity.
Fixes: 7bbca9e290
Cc: qemu-stable@nongnu.org
Cc: kwolf@redhat.com
Cc: eblake@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
It can't guarantee all cipher modes are supported
if one cipher algorithm is supported by a backend.
Let's extend qcrypto_cipher_supports() to take both
the algorithm and mode as parameters.
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
dmg.o was moved to block-obj-m in 5505e8b76 to become a separate module,
so that its reference to libbz2, since 6b383c08c, doesn't add an extra
library to the main executable.
Until recently, commit 06e60f70a (blockdev: Add dynamic module loading
for block drivers) moved it back to block-obj-y to simplify the design
of dynamic loading of block modules. But we don't want to lose the
feature of less library dependency on the main executable.
The solution here is to move only the bz2 related code to a separate
DSO file, and load it when dmg_open is called.
dmg_probe doesn't depend on bz2 support to work, and is the only code in
this file which can run before dmg_open.
While we are at it, fix the unhelpful cast of last argument passed to
dmg_uncompress_bz2.
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1473043845-13197-4-git-send-email-famz@redhat.com
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
The event currently only contains the BlockBackend name. However, with
anonymous BlockBackends, this is always the empty string. Add the qdev
ID (or if none was given, the QOM path) so that the user can still see
which device caused the event.
Event generation has to be moved from bdrv_eject() to the BlockBackend
because the BDS doesn't know the attached device, but that's easy
because blk_eject() is the only user of it.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Almost all block devices are qdevified by now. This allows us to go back
from the BlockBackend to the DeviceState. xen_disk is the last device
that is missing. We'll remember in the BlockBackend if a xen_disk is
attached and can then disable any features that require going from a BB
to the DeviceState.
While at it, clearly mark the function used by xen_disk as legacy even
in its name, not just in TODO comments.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
The event currently only contains the BlockBackend name. However, with
anonymous BlockBackends, this is always the empty string. Add the node
name so that the user can still see which block device caused the event.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This simplifies bottom half handlers by removing calls to qemu_bh_delete and
thus removing the need to stash the bottom half pointer in the opaque
datum.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Register the notifier using the specific API for block devices.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Instead of modifying the new BDS after it has been opened, use the newly
supported 'detect-zeroes' option in bdrv_open_common() so that all
requirements are checked (detect-zeroes=unmap requires discard=unmap).
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
The option whether or not to use a native AIO interface really isn't a
generic option for all drivers, but only applies to the native file
protocols. This patch moves the option in blockdev-add to the
appropriate places (raw-posix and raw-win32).
We still have to keep the flag BDRV_O_NATIVE_AIO for compatibility
because so far the AIO option was usually specified on the wrong layer
(the top-level format driver, which didn't even look at it) and then
inherited by the protocol driver (where it was actually used). We can't
forbid this use except in new interfaces.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
We can teach Xen to drain and flush each device as it needs to, instead
of trying to flush ALL devices. This removes the last user of
blk_flush_all.
The function is therefore removed under the premise that any new uses
of blk_flush_all would be the wrong paradigm: either flush the single
device that requires flushing, or use an appropriate flush_all mechanism
from outside of the BlkBackend layer.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Commit fe1a9cbc moved the flush_all routine from the bdrv layer to the
block-backend layer. In doing so, however, the semantics of the routine
changed slightly such that flush_all now used blk_flush instead of
bdrv_flush.
blk_flush can fail if the attached device model reports that it is not
"available," (i.e. the tray is open.) This changed the semantics of
flush_all such that it can now fail for e.g. open CDROM drives.
Reintroduce bdrv_flush_all to regain the old semantics without having to
alter the behavior of blk_flush or blk_flush_all, which are already
'doing the right thing.'
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Commit 0ed93d84ed ("linux-aio: process
completions from ioq_submit()") added an optimization that processes
completions each time ioq_submit() returns with requests in flight.
This commit introduces a "Co-routine re-entered recursively" error which
can be triggered with -drive format=qcow2,aio=native.
Fam Zheng <famz@redhat.com>, Kevin Wolf <kwolf@redhat.com>, and I
debugged the following backtrace:
(gdb) bt
#0 0x00007ffff0a046f5 in raise () at /lib64/libc.so.6
#1 0x00007ffff0a062fa in abort () at /lib64/libc.so.6
#2 0x0000555555ac0013 in qemu_coroutine_enter (co=0x5555583464d0) at util/qemu-coroutine.c:113
#3 0x0000555555a4b663 in qemu_laio_process_completions (s=s@entry=0x555557e2f7f0) at block/linux-aio.c:218
#4 0x0000555555a4b874 in ioq_submit (s=s@entry=0x555557e2f7f0) at block/linux-aio.c:331
#5 0x0000555555a4ba12 in laio_do_submit (fd=fd@entry=13, laiocb=laiocb@entry=0x555559d38ae0, offset=offset@entry=2932727808, type=type@entry=1) at block/linux-aio.c:383
#6 0x0000555555a4bbd3 in laio_co_submit (bs=<optimized out>, s=0x555557e2f7f0, fd=13, offset=2932727808, qiov=0x555559d38e20, type=1) at block/linux-aio.c:402
#7 0x0000555555a4fd23 in bdrv_driver_preadv (bs=bs@entry=0x55555663bcb0, offset=offset@entry=2932727808, bytes=bytes@entry=8192, qiov=qiov@entry=0x555559d38e20, flags=0) at block/io.c:804
#8 0x0000555555a52b34 in bdrv_aligned_preadv (bs=bs@entry=0x55555663bcb0, req=req@entry=0x555559d38d20, offset=offset@entry=2932727808, bytes=bytes@entry=8192, align=align@entry=512, qiov=qiov@entry=0x555559d38e20, flags=0) at block/io.c:1041
#9 0x0000555555a52db8 in bdrv_co_preadv (child=<optimized out>, offset=2932727808, bytes=8192, qiov=qiov@entry=0x555559d38e20, flags=flags@entry=0) at block/io.c:1133
#10 0x0000555555a29629 in qcow2_co_preadv (bs=0x555556635890, offset=6178725888, bytes=8192, qiov=0x555557527840, flags=<optimized out>) at block/qcow2.c:1509
#11 0x0000555555a4fd23 in bdrv_driver_preadv (bs=bs@entry=0x555556635890, offset=offset@entry=6178725888, bytes=bytes@entry=8192, qiov=qiov@entry=0x555557527840, flags=0) at block/io.c:804
#12 0x0000555555a52b34 in bdrv_aligned_preadv (bs=bs@entry=0x555556635890, req=req@entry=0x555559d39000, offset=offset@entry=6178725888, bytes=bytes@entry=8192, align=align@entry=1, qiov=qiov@entry=0x555557527840, flags=0) at block/io.c:1041
#13 0x0000555555a52db8 in bdrv_co_preadv (child=<optimized out>, offset=offset@entry=6178725888, bytes=bytes@entry=8192, qiov=qiov@entry=0x555557527840, flags=flags@entry=0) at block/io.c:1133
#14 0x0000555555a4515a in blk_co_preadv (blk=0x5555566356d0, offset=6178725888, bytes=8192, qiov=0x555557527840, flags=0) at block/block-backend.c:783
#15 0x0000555555a45266 in blk_aio_read_entry (opaque=0x5555577025e0) at block/block-backend.c:991
#16 0x0000555555ac0cfa in coroutine_trampoline (i0=<optimized out>, i1=<optimized out>) at util/coroutine-ucontext.c:78
It turned out that re-entrant ioq_submit() and completion processing
between three requests caused this error. The following check is not
sufficient to prevent recursively entering coroutines:
if (laiocb->co != qemu_coroutine_self()) {
qemu_coroutine_enter(laiocb->co);
}
As the following coroutine backtrace shows, not just the current
coroutine (self) can be entered. There might also be other coroutines
that are currently entered and transferred control due to the qcow2 lock
(CoMutex):
(gdb) qemu coroutine 0x5555583464d0
#0 0x0000555555ac0c90 in qemu_coroutine_switch (from_=from_@entry=0x5555583464d0, to_=to_@entry=0x5555572f9890, action=action@entry=COROUTINE_ENTER) at util/coroutine-ucontext.c:175
#1 0x0000555555abfe54 in qemu_coroutine_enter (co=0x5555572f9890) at util/qemu-coroutine.c:117
#2 0x0000555555ac031c in qemu_co_queue_run_restart (co=co@entry=0x5555583462c0) at util/qemu-coroutine-lock.c:60
#3 0x0000555555abfe5e in qemu_coroutine_enter (co=0x5555583462c0) at util/qemu-coroutine.c:119
#4 0x0000555555a4b663 in qemu_laio_process_completions (s=s@entry=0x555557e2f7f0) at block/linux-aio.c:218
#5 0x0000555555a4b874 in ioq_submit (s=s@entry=0x555557e2f7f0) at block/linux-aio.c:331
#6 0x0000555555a4ba12 in laio_do_submit (fd=fd@entry=13, laiocb=laiocb@entry=0x55555a338b40, offset=offset@entry=2911477760, type=type@entry=1) at block/linux-aio.c:383
#7 0x0000555555a4bbd3 in laio_co_submit (bs=<optimized out>, s=0x555557e2f7f0, fd=13, offset=2911477760, qiov=0x55555a338e80, type=1) at block/linux-aio.c:402
#8 0x0000555555a4fd23 in bdrv_driver_preadv (bs=bs@entry=0x55555663bcb0, offset=offset@entry=2911477760, bytes=bytes@entry=8192, qiov=qiov@entry=0x55555a338e80, flags=0) at block/io.c:804
#9 0x0000555555a52b34 in bdrv_aligned_preadv (bs=bs@entry=0x55555663bcb0, req=req@entry=0x55555a338d80, offset=offset@entry=2911477760, bytes=bytes@entry=8192, align=align@entry=512, qiov=qiov@entry=0x55555a338e80, flags=0) at block/io.c:1041
#10 0x0000555555a52db8 in bdrv_co_preadv (child=<optimized out>, offset=2911477760, bytes=8192, qiov=qiov@entry=0x55555a338e80, flags=flags@entry=0) at block/io.c:1133
#11 0x0000555555a29629 in qcow2_co_preadv (bs=0x555556635890, offset=6157475840, bytes=8192, qiov=0x5555575df720, flags=<optimized out>) at block/qcow2.c:1509
#12 0x0000555555a4fd23 in bdrv_driver_preadv (bs=bs@entry=0x555556635890, offset=offset@entry=6157475840, bytes=bytes@entry=8192, qiov=qiov@entry=0x5555575df720, flags=0) at block/io.c:804
#13 0x0000555555a52b34 in bdrv_aligned_preadv (bs=bs@entry=0x555556635890, req=req@entry=0x55555a339060, offset=offset@entry=6157475840, bytes=bytes@entry=8192, align=align@entry=1, qiov=qiov@entry=0x5555575df720, flags=0) at block/io.c:1041
#14 0x0000555555a52db8 in bdrv_co_preadv (child=<optimized out>, offset=offset@entry=6157475840, bytes=bytes@entry=8192, qiov=qiov@entry=0x5555575df720, flags=flags@entry=0) at block/io.c:1133
#15 0x0000555555a4515a in blk_co_preadv (blk=0x5555566356d0, offset=6157475840, bytes=8192, qiov=0x5555575df720, flags=0) at block/block-backend.c:783
#16 0x0000555555a45266 in blk_aio_read_entry (opaque=0x555557231aa0) at block/block-backend.c:991
#17 0x0000555555ac0cfa in coroutine_trampoline (i0=<optimized out>, i1=<optimized out>) at util/coroutine-ucontext.c:78
Use the new qemu_coroutine_entered() function instead of comparing
against qemu_coroutine_self(). This is correct because:
1. If a coroutine is not entered then it must have yielded to wait for
I/O completion. It is therefore safe to enter.
2. If a coroutine is entered then it must be in
ioq_submit()/qemu_laio_process_completions() because otherwise it
would be yielded while waiting for I/O completion. Therefore it will
check laio->ret and return from ioq_submit() instead of yielding,
i.e. it's guaranteed not to hang.
Reported-by: Fam Zheng <famz@redhat.com>
Tested-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 1474989516-18255-4-git-send-email-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This patch fixes bug with stopping and restarting replay
through monitor.
Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20160926080815.6992.71818.stgit@PASHA-ISP>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
Block layer patches
# gpg: Signature made Fri 23 Sep 2016 12:59:46 BST
# gpg: using RSA key 0x7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6
* remotes/kevin/tags/for-upstream: (33 commits)
block: Remove BB interface from blockdev-add/del
qemu-iotests/141: Avoid blockdev-add with id
block: Avoid printing NULL string in error messages
qemu-iotests/139: Avoid blockdev-add with id
qemu-iotests/124: Avoid blockdev-add with id
qemu-iotests/118: Avoid blockdev-add with id
qemu-iotests/117: Avoid blockdev-add with id
qemu-iotests/087: Avoid blockdev-add with id
qemu-iotests/081: Avoid blockdev-add with id
qemu-iotests/071: Avoid blockdev-add with id
qemu-iotests/067: Avoid blockdev-add with id
qemu-iotests/041: Avoid blockdev-add with id
qemu-iotests/118: Test media change with qdev name
block: Accept device model name for block_set_io_throttle
block: Accept device model name for blockdev-change-medium
block: Accept device model name for eject
block: Accept device model name for x-blockdev-remove-medium
block: Accept device model name for x-blockdev-insert-medium
block: Accept device model name for blockdev-open/close-tray
qdev-monitor: Add blk_by_qdev_id()
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Version: GnuPG v2
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Merge remote-tracking branch 'remotes/famz/tags/various-pull-request' into staging
# gpg: Signature made Fri 23 Sep 2016 05:58:28 BST
# gpg: using RSA key 0xCA35624C6A9171C6
# gpg: Good signature from "Fam Zheng <famz@redhat.com>"
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 5003 7CB7 9706 0F76 F021 AD56 CA35 624C 6A91 71C6
* remotes/famz/tags/various-pull-request: (23 commits)
docker: exec $CMD
docker: Terminate instances at SIGTERM and SIGHUP
docker: Support showing environment information
docker: Print used options before doing configure
docker: Flatten default target list in test-quick
docker: Update fedora image to latest
docker: Generate /packages.txt in ubuntu image
docker: Generate /packages.txt in fedora image
docker: Generate /packages.txt in centos6 image
tests: Ignore test-uuid
Add UUID files to MAINTAINERS
tests: Add uuid tests
uuid: Tighten uuid parse
vl: Switch qemu_uuid to QemuUUID
configure: Remove detection code for UUID
tests: No longer dependent on CONFIG_UUID
crypto: Switch to QEMU UUID API
vpc: Use QEMU UUID API
vdi: Use QEMU UUID API
vhdx: Use QEMU UUID API
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
# Conflicts:
# tests/Makefile.include
This finds a BlockBackend given the device model that is attached to it.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Now that we're checking for duplicates in the reopen queue, there's no
need to force a specific order in which the queue is constructed so we
can revert 3db2bd5508.
Since both ways of constructing the queue are now valid, this patch
doesn't have any effect on the behavior of QEMU and is not strictly
necessary. However it can help us check that the fix for the reopen
queue is robust: if it stops working properly at some point, iotest
040 will break.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This adds the "read-only" option to the QDict. One important effect of
this change is that when a child inherits options from its parent, the
existing "read-only" mode can be preserved if it was explicitly set
previously.
This addresses scenarios like this:
[E] <- [D] <- [C] <- [B] <- [A]
In this case, if we reopen [D] with read-only=off, and later reopen
[B], then [D] will not inherit read-only=on from its parent during the
bdrv_reopen_queue_child() stage.
The BDRV_O_RDWR flag is not removed yet, but its keep in sync with the
value of the "read-only" option.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Broken in previous commit:
commit aaa4d20b49
Author: Kevin Wolf <kwolf@redhat.com>
Date: Wed Jun 1 15:21:05 2016 +0200
qcow2: Make copy_sectors() byte based
The copy_sectors() code was originally using the 'sector'
parameter for encryption, which was passed in by the caller
from the QCowL2Meta.offset field (aka the guest logical
offset).
After the change, the code is using 'cluster_offset' which
was passed in from QCow2L2Meta.alloc_offset field (aka the
host physical offset).
This would cause the data to be encrypted using an incorrect
initialization vector which will in turn cause later reads
to return garbage.
Although current qcow2 built-in encryption is blocked from
usage in the emulator, one could still hit this if writing
to the file via qemu-{img,io,nbd} commands.
Cc: qemu-stable@nongnu.org
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Previously we conditionally generated footer->uuid, when libuuid was
available. Now that we have a built-in implementation, we can switch to
it.
Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Message-Id: <1474432046-325-6-git-send-email-famz@redhat.com>
The UUID operations we need from libuuid are fully supported by QEMU UUID
implementation. Use it, and remove the unused code.
Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Message-Id: <1474432046-325-5-git-send-email-famz@redhat.com>
This removes our dependency to libuuid, so that the driver can always be
built.
Similar to how we handled data plane configure options, --enable-vhdx
and --disable-vhdx are also changed to a nop with a message saying it's
obsolete.
Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Message-Id: <1474432046-325-4-git-send-email-famz@redhat.com>
A number of different places across the code base use CONFIG_UUID. Some
of them are soft dependency, some are not built if libuuid is not
available, some come with dummy fallback, some throws runtime error.
It is hard to maintain, and hard to reason for users.
Since UUID is a simple standard with only a small number of operations,
it is cleaner to have a central support in libqemuutil. This patch adds
qemu_uuid_* functions that all uuid users in the code base can
rely on. Except for qemu_uuid_generate which is new code, all other
functions are just copy from existing fallbacks from other files.
Note that qemu_uuid_parse is moved without updating the function
signature to use QemuUUID, to keep this patch simple.
Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Message-Id: <1474432046-325-2-git-send-email-famz@redhat.com>
When qemu uses iscsi devices in sg mode, iscsilun->block_size
is left at 0. Prior to commits cf081fca and similar, when
block limits were tracked in sectors, this did not matter:
various block limits were just left at 0. But when we started
scaling by block size, this caused SIGFPE.
Then, in a later patch, commit a5b8dd2c added an assertion to
bdrv_open_common() that request_alignment is always non-zero;
which was not true for SG mode. Rather than relax that assertion,
we can just provide a sane value (we don't know of any SG device
with a block size smaller than qemu's default sizing of 512 bytes).
One possible solution for SG mode is to just blindly skip ALL
of iscsi_refresh_limits(), since we already short circuit so
many other things in sg mode. But this patch takes a slightly
more conservative approach, and merely guarantees that scaling
will succeed, while still using multiples of the original size
where possible. Resulting limits may still be zero in SG mode
(that is, we mostly only fix block_size used as a denominator
or which affect assertions, not all uses).
Reported-by: Holger Schranz <holger@fam-schranz.de>
Signed-off-by: Eric Blake <eblake@redhat.com>
CC: qemu-stable@nongnu.org
Message-Id: <1473283640-15756-1-git-send-email-eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The 'block-commit' command has a 'top' parameter to specify the
topmost node from which the data is going to be copied.
[E] <- [D] <- [C] <- [B] <- [A]
In this case if [C] is the top node then this is the result:
[E] <- [B] <- [A]
[B] must be modified so its backing image string points to [E] instead
of [C]. commit_start() takes care of reopening [B] in read-write
mode, and commit_complete() puts it back in read-only mode once the
operation has finished.
In order to find [B] (the overlay node) we look for the node that has
[C] (the top node) as its backing image. However in commit_complete()
we're doing it after [C] has been removed from the chain, so [B] is
never found and remains in read-write mode.
This patch gets the overlay node before the backing chain is
manipulated.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: 1471836963-28548-1-git-send-email-berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
Modularizes the nfs block driver so that it gets dynamically loaded.
Signed-off-by: Colin Lord <clord@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1471008424-16465-5-git-send-email-clord@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Extend the current module interface to allow for block drivers to be
loaded dynamically on request. The only block drivers that can be
converted into modules are the drivers that don't perform any init
operation except for registering themselves.
In addition, only the protocol drivers are being modularized, as they
are the only ones which see significant performance benefits. The format
drivers do not generally link to external libraries, so modularizing
them is of no benefit from a performance perspective.
All the necessary module information is located in a new structure found
in module_block.h
This spoils the purpose of 5505e8b76f (block/dmg: make it modular).
Before this patch, if module build is enabled, block-dmg.so is linked to
libbz2, whereas the main binary is not. In downstream, theoretically, it
means only the qemu-block-extra package depends on libbz2, while the
main QEMU package needn't to. With this patch, we (temporarily) change
the case so that the main QEMU depends on libbz2 again.
Signed-off-by: Marc Marí <markmb@redhat.com>
Signed-off-by: Colin Lord <clord@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1471008424-16465-4-git-send-email-clord@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
[mreitz: Do a signed comparison against the length of
block_driver_modules[], so it will not cause a compile error when
empty]
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit moves the initialization of the QemuOptsList qemu_iscsi_opts
struct out of block/iscsi.c in order to allow the iscsi module to be
dynamically loaded.
Signed-off-by: Colin Lord <clord@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1471008424-16465-2-git-send-email-clord@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
As protection against bruteforcing passphrases, the PBKDF
algorithm is tuned by counting the number of iterations
needed to produce 1 second of running time. If the machine
that the image will be used on is much faster than the
machine where the image is created, it can be desirable
to raise the number of iterations. This change adds a new
'iter-time' property that allows the user to choose the
iteration wallclock time.
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This patch is the result of coccinelle script
scripts/coccinelle/typecast.cocci
CC: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>
CC: qemu-block@nongnu.org
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Another attempt to fix the bug 1596870.
When creating new disk backed by remote file accessed via HTTPS and the
backing file has zero length, qemu-img terminates with uniformative
error message:
qemu-img: disk.qcow2: CURL: Error opening file:
While it may not make much sense to operate on empty file, other block
backends (e.g. raw backend for regular files) seem to allow it. This
patch fixes it for the curl backend and improves the reported error.
Signed-off-by: Tomáš Golembiovský <tgolembi@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Unused function declarations were found using a simple gcc plugin and
manually verified by grepping the sources.
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Auto complete mirror job in background to prevent from
blocking synchronously
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
Signed-off-by: Wang WeiWei <wangww.fnst@cn.fujitsu.com>
Message-id: 1469602913-20979-7-git-send-email-xiecl.fnst@cn.fujitsu.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Some programs that add a dependency on it will use
the block layer directly.
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
Signed-off-by: Wang WeiWei <wangww.fnst@cn.fujitsu.com>
Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Message-id: 1469602913-20979-5-git-send-email-xiecl.fnst@cn.fujitsu.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Normal backup(sync='none') workflow:
step 1. NBD peformance I/O write from client to server
qcow2_co_writev
bdrv_co_writev
...
bdrv_aligned_pwritev
notifier_with_return_list_notify -> backup_do_cow
bdrv_driver_pwritev // write new contents
step 2. drive-backup sync=none
backup_do_cow
{
wait_for_overlapping_requests
cow_request_begin
for(; start < end; start++) {
bdrv_co_readv_no_serialising //read old contents from Secondary disk
bdrv_co_writev // write old contents to hidden-disk
}
cow_request_end
}
step 3. Then roll back to "step 1" to write new contents to Secondary disk.
And for replication, we must make sure that we only read the old contents from
Secondary disk in order to keep contents consistent.
1) Replication workflow of Secondary
virtio-blk
^
-------> 1 NBD |
|| server 3 replication
|| ^ ^
|| | backing backing |
|| Secondary disk 6<-------- hidden-disk 5 <-------- active-disk 4
|| | ^
|| '-------------------------'
|| drive-backup sync=none 2
Hence, we need these interfaces to implement coarse-grained serialization between
COW of Secondary disk and the read operation of replication.
Example codes about how to use them:
*#include "block/block_backup.h"
static coroutine_fn int xxx_co_readv()
{
CowRequest req;
BlockJob *job = secondary_disk->bs->job;
if (job) {
backup_wait_for_overlapping_requests(job, start, end);
backup_cow_request_begin(&req, job, start, end);
ret = bdrv_co_readv();
backup_cow_request_end(&req);
goto out;
}
ret = bdrv_co_readv();
out:
return ret;
}
Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Wang WeiWei <wangww.fnst@cn.fujitsu.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1469602913-20979-4-git-send-email-xiecl.fnst@cn.fujitsu.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
In order to reduce completion latency it makes sense to harvest completed
requests ASAP. Very fast backend device can complete requests just after
submission, so it is worth trying to check ring buffer in order to peek
completed requests directly after io_submit() has been called.
Indeed, this patch reduces the completions latencies and increases the
overall throughput, e.g. the following is the percentiles of number of
completed requests at once:
1th 10th 20th 30th 40th 50th 60th 70th 80th 90th 99.99th
Before 2 4 42 112 128 128 128 128 128 128 128
After 1 1 4 14 33 45 47 48 50 51 108
That means, that before the current patch is applied the ring buffer is
observed as full (128 requests were consumed at once) in 60% of calls.
After patch is applied the distribution of number of completed requests
is "smoother" and the queue (requests in-flight) is almost never full.
The fio read results are the following (write results are almost the
same and are not showed here):
Before
------
job: (groupid=0, jobs=8): err= 0: pid=2227: Tue Jul 19 11:29:50 2016
Description : [Emulation of Storage Server Access Pattern]
read : io=54681MB, bw=1822.7MB/s, iops=179779, runt= 30001msec
slat (usec): min=172, max=16883, avg=338.35, stdev=109.66
clat (usec): min=1, max=21977, avg=1051.45, stdev=299.29
lat (usec): min=317, max=22521, avg=1389.83, stdev=300.73
clat percentiles (usec):
| 1.00th=[ 346], 5.00th=[ 596], 10.00th=[ 708], 20.00th=[ 852],
| 30.00th=[ 932], 40.00th=[ 996], 50.00th=[ 1048], 60.00th=[ 1112],
| 70.00th=[ 1176], 80.00th=[ 1256], 90.00th=[ 1384], 95.00th=[ 1496],
| 99.00th=[ 1800], 99.50th=[ 1928], 99.90th=[ 2320], 99.95th=[ 2672],
| 99.99th=[ 4704]
bw (KB /s): min=205229, max=553181, per=12.50%, avg=233278.26, stdev=18383.51
After
------
job: (groupid=0, jobs=8): err= 0: pid=2220: Tue Jul 19 11:31:51 2016
Description : [Emulation of Storage Server Access Pattern]
read : io=57637MB, bw=1921.2MB/s, iops=189529, runt= 30002msec
slat (usec): min=169, max=20636, avg=329.61, stdev=124.18
clat (usec): min=2, max=19592, avg=988.78, stdev=251.04
lat (usec): min=381, max=21067, avg=1318.42, stdev=243.58
clat percentiles (usec):
| 1.00th=[ 310], 5.00th=[ 580], 10.00th=[ 748], 20.00th=[ 876],
| 30.00th=[ 908], 40.00th=[ 948], 50.00th=[ 1012], 60.00th=[ 1064],
| 70.00th=[ 1080], 80.00th=[ 1128], 90.00th=[ 1224], 95.00th=[ 1288],
| 99.00th=[ 1496], 99.50th=[ 1608], 99.90th=[ 1960], 99.95th=[ 2256],
| 99.99th=[ 5408]
bw (KB /s): min=212149, max=390160, per=12.49%, avg=245746.04, stdev=11606.75
Throughput increased from 1822MB/s to 1921MB/s, average completion latencies
decreased from 1051us to 988us.
Signed-off-by: Roman Pen <roman.penyaev@profitbricks.com>
Message-id: 1468931263-32667-4-git-send-email-roman.penyaev@profitbricks.com
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-devel@nongnu.org
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Prepare processing events function to be called from ioq_submit(),
thus split function on two parts: the first harvests completed IO
requests, the second submits pending requests.
Signed-off-by: Roman Pen <roman.penyaev@profitbricks.com>
Message-id: 1468931263-32667-3-git-send-email-roman.penyaev@profitbricks.com
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-devel@nongnu.org
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
