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2014-10-20block: Merge BlockBackend and BlockDriverState name spacesMarkus Armbruster1-1/+1
BlockBackend's name space is separate only to keep the initial patches simple. Time to merge the two. Retain bdrv_find() and bdrv_get_device_name() for now, to keep this series manageable. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-20block: Eliminate BlockDriverState member device_name[]Markus Armbruster2-3/+1
device_name[] can become non-empty only in bdrv_new_root() and bdrv_move_feature_fields(). The latter is used only to undo damage done by bdrv_swap(). The former is called only by blk_new_with_bs(). Therefore, when a BlockDriverState's device_name[] is non-empty, then it's been created with a BlockBackend, and vice versa. Furthermore, blk_new_with_bs() keeps the two names equal. Therefore, device_name[] is redundant. Eliminate it. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-20block: Eliminate bdrv_iterate(), use bdrv_next()Markus Armbruster1-2/+0
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Benoît Canet <benoit.canet@nodalink.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-20block: Connect BlockBackend to BlockDriverStateMarkus Armbruster1-0/+2
Convenience function blk_new_with_bs() creates a BlockBackend with its BlockDriverState. Callers have to unref both. The commit after next will relieve them of the need to unref the BlockDriverState. Complication: due to the silly way drive_del works, we need a way to hide a BlockBackend, just like bdrv_make_anon(). To emphasize its "special" status, give the function a suitably off-putting name: blk_hide_on_behalf_of_do_drive_del(). Unfortunately, hiding turns the BlockBackend's name into the empty string. Can't avoid that without breaking the blk->bs->device_name equals blk->name invariant. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-20block: Split bdrv_new_root() off bdrv_new()Markus Armbruster1-1/+2
Creating an anonymous BDS can't fail. Make that obvious. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoît Canet <benoit.canet@nodalink.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-09-22async: aio_context_new(): Handle event_notifier_init failureChrysostomos Nanakos1-1/+1
On a system with a low limit of open files the initialization of the event notifier could fail and QEMU exits without printing any error information to the user. The problem can be easily reproduced by enforcing a low limit of open files and start QEMU with enough I/O threads to hit this limit. The same problem raises, without the creation of I/O threads, while QEMU initializes the main event loop by enforcing an even lower limit of open files. This commit adds an error message on failure: # qemu [...] -object iothread,id=iothread0 -object iothread,id=iothread1 qemu: Failed to initialize event notifier: Too many open files in system Signed-off-by: Chrysostomos Nanakos <cnanakos@grnet.gr> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-09-22block: Rename qemu_aio_release -> qemu_aio_unrefFam Zheng1-1/+1
Suggested-by: Benoît Canet <benoit.canet@irqsave.net> Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-09-22block: Drop AIOCBInfo.cancelFam Zheng1-1/+0
Now that all the implementations are converted to asynchronous version and we can emulate synchronous cancellation with it. Let's drop the unused member. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-09-22block: Add bdrv_aio_cancel_asyncFam Zheng2-0/+3
This is the async version of bdrv_aio_cancel, which doesn't block the caller. It guarantees that the cb is called either before returning or some time later. bdrv_aio_cancel can base on bdrv_aio_cancel_async, later we can convert all .io_cancel implementations to .io_cancel_async, and the aio_poll is the common logic. In the end, .io_cancel can be dropped. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-09-22block: Add refcnt in BlockDriverAIOCBFam Zheng1-0/+2
This will be useful in synchronous cancel emulation with bdrv_aio_cancel_async. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-09-10block: Make the block accounting functions operate on BlockAcctStatsBenoît Canet2-5/+8
This is the next step for decoupling block accounting functions from BlockDriverState. In a future commit the BlockAcctStats structure will be moved from BlockDriverState to the device models structures. Note that bdrv_get_stats was introduced so device models can retrieve the BlockAcctStats structure of a BlockDriverState without being aware of it's layout. This function should go away when BlockAcctStats will be embedded in the device models structures. CC: Kevin Wolf <kwolf@redhat.com> CC: Stefan Hajnoczi <stefanha@redhat.com> CC: Keith Busch <keith.busch@intel.com> CC: Anthony Liguori <aliguori@amazon.com> CC: "Michael S. Tsirkin" <mst@redhat.com> CC: Paolo Bonzini <pbonzini@redhat.com> CC: Eric Blake <eblake@redhat.com> CC: Peter Maydell <peter.maydell@linaro.org> CC: Michael Tokarev <mjt@tls.msk.ru> CC: John Snow <jsnow@redhat.com> CC: Markus Armbruster <armbru@redhat.com> CC: Alexander Graf <agraf@suse.de> CC: Max Reitz <mreitz@redhat.com> Signed-off-by: Benoît Canet <benoit.canet@nodalink.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-09-10block: rename BlockAcctType members to start with BLOCK_ instead of BDRV_Benoît Canet1-7/+7
The middle term goal is to move the BlockAcctStats structure in the device models. (Capturing I/O accounting statistics in the device models is good for billing) This patch make a small step in this direction by removing a reference to BDRV. CC: Kevin Wolf <kwolf@redhat.com> CC: Stefan Hajnoczi <stefanha@redhat.com> CC: Keith Busch <keith.busch@intel.com> CC: Anthony Liguori <aliguori@amazon.com> CC: "Michael S. Tsirkin" <mst@redhat.com> CC: Paolo Bonzini <pbonzini@redhat.com> CC: John Snow <jsnow@redhat.com> CC: Richard Henderson <rth@twiddle.net> CC: Markus Armbruster <armbru@redhat.com> CC: Alexander Graf <agraf@suse.de>i Signed-off-by: Benoît Canet <benoit.canet@nodalink.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-09-10block: Extract the block accounting codeBenoît Canet3-24/+58
The plan is to add new accounting metrics (latency, invalid requests, failed requests, queue depth) and block.c is overpopulated so it will be better to work in a separate module. Moreover the long term plan is to have statistics in each of the BDS of the graph for metrology purpose; this means that the device model statistics must move from the topmost BDS to the device model. So we need to decouple the statistic code from BlockDriverState. This is another argument for the extraction of the code in a separate module. CC: Kevin Wolf <kwolf@redhat.com> CC: Stefan Hajnoczi <stefanha@redhat.com> CC: Max Reitz <mreitz@redhat.com> CC: Eric Blake <eblake@redhat.com> CC: Benoit Canet <benoit@irqsave.net> CC: Fam Zheng <famz@redhat.com> CC: Peter Crosthwaite <peter.crosthwaite@xilinx.com> CC: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Benoît Canet <benoit.canet@nodalink.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-09-10block: Extract the BlockAcctStats structureBenoît Canet2-4/+8
Extract the block accounting statistics into a structure so the block device models can hold them in the future. CC: Kevin Wolf <kwolf@redhat.com> CC: Stefan Hajnoczi <stefanha@redhat.com> CC: Max Reitz <mreitz@redhat.com> CC: Eric Blake <eblake@redhat.com> Signed-off-by: Benoît Canet <benoit.canet@nodalink.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-09-10thread-pool: Drop unnecessary includesMarkus Armbruster1-5/+1
Dragging block_int.h into a header is *not* nice. Fortunately, this is the only offender. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-08-29block: Add AIO context notifiersMax Reitz1-0/+41
If a long-running operation on a BDS wants to always remain in the same AIO context, it somehow needs to keep track of the BDS changing its context. This adds a function for registering callbacks on a BDS which are called whenever the BDS is attached or detached from an AIO context. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-29aio-win32: add support for socketsPaolo Bonzini1-2/+0
Uses the same select/WSAEventSelect scheme as main-loop.c. WSAEventSelect() is edge-triggered, so it cannot be used directly, but it is still used as a way to exit from a blocking g_poll(). Before g_poll() is called, we poll sockets with a non-blocking select() to achieve the level-triggered semantics we require: if a socket is ready, the g_poll() is made non-blocking too. Based on a patch from Or Goshen. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-29AioContext: introduce aio_preparePaolo Bonzini1-1/+8
This will be used to implement socket polling on Windows. On Windows, select() and g_poll() are completely different; sockets are polled with select() before calling g_poll, and the g_poll must be nonblocking if select() says a socket is ready. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-29AioContext: export and use aio_dispatchPaolo Bonzini1-0/+6
So far, aio_poll's scheme was dispatch/poll/dispatch, where the first dispatch phase was used only in the GSource case in order to avoid a blocking poll. Earlier patches changed it to dispatch/prepare/poll/dispatch, where prepare is aio_compute_timeout. By making aio_dispatch public, we can remove the first dispatch phase altogether, so that both aio_poll and the GSource use the same prepare/poll/dispatch scheme. This patch breaks the invariant that aio_poll(..., true) will not block the first time it returns false. This used to be fundamental for qemu_aio_flush's implementation as "while (qemu_aio_wait()) {}" but no code in QEMU relies on this invariant anymore. The return value of aio_poll() is now comparable with that of g_main_context_iteration. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-29AioContext: take bottom halves into account when computing aio_poll timeoutPaolo Bonzini1-0/+8
Right now, QEMU invokes aio_bh_poll before the "poll" phase of aio_poll. It is simpler to do it afterwards and skip the "poll" phase altogether when the OS-dependent parts of AioContext are invoked from GSource. This way, AioContext behaves more similarly when used as a GSource vs. when used as stand-alone. As a start, take bottom halves into account when computing the poll timeout. If a bottom half is ready, do a non-blocking poll. As a side effect, this makes idle bottom halves work with aio_poll; an improvement, but not really an important one since they are deprecated. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-29coroutine: Drop co_sleep_nsFam Zheng1-8/+0
block_job_sleep_ns is the only user. Since we are moving towards AioContext aware code, it's better to use the explicit version and drop the old one. Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Benoît Canet <benoit.canet@nodalink.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-20block: Add bdrv_refresh_filename()Max Reitz2-0/+7
Some block devices may not have a filename in their BDS; and for some, there may not even be a normal filename at all. To work around this, add a function which tries to construct a valid filename for the BDS.filename field. If a filename exists or a block driver is able to reconstruct a valid filename (which is placed in BDS.exact_filename), this can directly be used. If no filename can be constructed, we can still construct an options QDict which is then converted to a JSON object and prefixed with the "json:" pseudo protocol prefix. The QDict is placed in BDS.full_open_options. For most block drivers, this process can be done automatically; those that need special handling may define a .bdrv_refresh_filename() method to fill BDS.exact_filename and BDS.full_open_options themselves. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-08-15block: Introduce qemu_try_blockalign()Kevin Wolf1-0/+1
This function returns NULL instead of aborting when an allocation fails. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net>
2014-08-15coroutine: make pool size dynamicStefan Hajnoczi1-0/+11
Allow coroutine users to adjust the pool size. For example, if the guest has multiple emulated disk drives we should keep around more coroutines. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2014-08-15block: New bdrv_nb_sectors()Markus Armbruster1-0/+1
A call to retrieve the image size converts between bytes and sectors several times: * BlockDriver method bdrv_getlength() returns bytes. * refresh_total_sectors() converts to sectors, rounding up, and stores in total_sectors. * bdrv_getlength() converts total_sectors back to bytes (now rounded up to a multiple of the sector size). * Callers wanting sectors rather bytes convert it right back. Example: bdrv_get_geometry(). bdrv_nb_sectors() provides a way to omit the last two conversions. It's exactly bdrv_getlength() with the conversion to bytes omitted. It's functionally like bdrv_get_geometry() without its odd error handling. Reimplement bdrv_getlength() and bdrv_get_geometry() on top of bdrv_nb_sectors(). The next patches will convert some users of bdrv_getlength() to bdrv_nb_sectors(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-07-18block: Add Error argument to bdrv_refresh_limits()Kevin Wolf2-2/+2
Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-07-14AioContext: do not rely on aio_poll(ctx, true) result to end a loopPaolo Bonzini1-3/+3
Currently, whenever aio_poll(ctx, true) has completed all pending work it returns true *and* the next call to aio_poll(ctx, true) will not block. This invariant has its roots in qemu_aio_flush()'s implementation as "while (qemu_aio_wait()) {}". However, qemu_aio_flush() does not exist anymore and bdrv_drain_all() is implemented differently; and this invariant is complicated to maintain and subtly different from the return value of GMainLoop's g_main_context_iteration. All calls to aio_poll(ctx, true) except one are guarded by a while() loop checking for a request to be incomplete, or a BlockDriverState to be idle. The one remaining call (in iothread.c) uses this to delay the aio_context_release/acquire pair until the AioContext is quiescent, however: - we can do the same just by using non-blocking aio_poll, similar to how vl.c invokes main_loop_wait - it is buggy, because it does not ensure that the AioContext is released between an aio_notify and the next time the iothread goes to sleep. This leads to hangs when stopping the dataplane thread. In the end, these semantics are a bad match for the current users of AioContext. So modify that one exception in iothread.c, which also fixes the hangs, as well as the testcase so that it use the same idiom as the actual QEMU code. Reported-by: Christian Borntraeger <borntraeger@de.ibm.com> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-07-09AioContext: speed up aio_notifyPaolo Bonzini1-0/+9
In many cases, the call to event_notifier_set in aio_notify is unnecessary. In particular, if we are executing aio_dispatch, or if aio_poll is not blocking, we know that we will soon get to the next loop iteration (if necessary); the thread that hosts the AioContext's event loop does not need any nudging. The patch includes a Promela formal model that shows that this really works and does not need any further complication such as generation counts. It needs a memory barrier though. The generation counts are not needed because any change to ctx->dispatching after the memory barrier is okay for aio_notify. If it changes from zero to one, it is the right thing to skip event_notifier_set. If it changes from one to zero, the event_notifier_set is unnecessary but harmless. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-07-09block: drop aio functions that operate on the main AioContextPaolo Bonzini3-18/+5
The main AioContext should be accessed explicitly via qemu_get_aio_context(). Most of the time, using it is not the right thing to do. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-07-07block: block: introduce APIs for submitting IO as a batchMing Lei2-0/+9
This patch introduces three APIs so that following patches can support queuing I/O requests and submitting them as a batch for improving I/O performance. Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-07-01block: extend block-commit to accept a string for the backing fileJeff Cody2-2/+4
On some image chains, QEMU may not always be able to resolve the filenames properly, when updating the backing file of an image after a block commit. For instance, certain relative pathnames may fail, or drives may have been specified originally by file descriptor (e.g. /dev/fd/???), or a relative protocol pathname may have been used. In these instances, QEMU may lack the information to be able to make the correct choice, but the user or management layer most likely does have that knowledge. With this extension to the block-commit api, the user is able to change the backing file of the overlay image as part of the block-commit operation. This allows the change to be 'safe', in the sense that if the attempt to write the overlay image metadata fails, then the block-commit operation returns failure, without disrupting the guest. If the commit top is the active layer, then specifying the backing file string will be treated as an error (there is no overlay image to modify in that case). If a backing file string is not specified in the command, the backing file string to use is determined in the same manner as it was previously. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-07-01block: add helper function to determine if a BDS is in a chainJeff Cody1-0/+1
This is a small helper function, to determine if 'base' is in the chain of BlockDriverState 'top'. It returns true if it is in the chain, and false otherwise. If either argument is NULL, it will also return false. Reviewed-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-07-01qemu-img create: add 'nocow' optionChunyan Liu1-0/+1
Add 'nocow' option so that users could have a chance to set NOCOW flag to newly created files. It's useful on btrfs file system to enhance performance. Btrfs has low performance when hosting VM images, even more when the guest in those VM are also using btrfs as file system. One way to mitigate this bad performance is to turn off COW attributes on VM files. Generally, there are two ways to turn off NOCOW on btrfs: a) by mounting fs with nodatacow, then all newly created files will be NOCOW. b) per file. Add the NOCOW file attribute. It could only be done to empty or new files. This patch tries the second way, according to the option, it could add NOCOW per file. For most block drivers, since the create file step is in raw-posix.c, so we can do setting NOCOW flag ioctl in raw-posix.c only. But there are some exceptions, like block/vpc.c and block/vdi.c, they are creating file by calling qemu_open directly. For them, do the same setting NOCOW flag ioctl work in them separately. [Fixed up 082.out due to the new 'nocow' creation option --Stefan] Signed-off-by: Chunyan Liu <cyliu@suse.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-06-30Merge remote-tracking branch 'remotes/bonzini/nbd-next' into stagingPeter Maydell1-0/+12
* remotes/bonzini/nbd-next: nbd: Handle NBD_OPT_LIST option. nbd: Handle fixed new-style clients. nbd: Shutdown socket before closing. nbd: Don't validate from and len in NBD_CMD_DISC. nbd: Don't export a block device with no medium. Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2014-06-30nbd: Handle NBD_OPT_LIST option.Hani Benhabiles1-0/+3
Signed-off-by: Hani Benhabiles <kroosec@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-06-30nbd: Handle fixed new-style clients.Hani Benhabiles1-0/+9
When this flag is set, the server tells the client that it can send another option if the server received a request with an option that it doesn't understand instead of directly closing the connection. Also add link to the most up-to-date documentation. Signed-off-by: Hani Benhabiles <kroosec@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-06-29Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into stagingPeter Maydell4-2/+19
Block patches for 2.1.0-rc0 # gpg: Signature made Fri 27 Jun 2014 19:50:32 BST using RSA key ID C88F2FD6 # gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" * remotes/kevin/tags/for-upstream: (47 commits) iotests: Fix 083 for out-of-tree builds iotests: Drop Python version from 065's Shebang iotests: Use $PYTHON for Python scripts iotests: Source common.env configure: Enable out-of-tree iotests iotests: Allow out-of-tree run block.c: Don't return success for bdrv_append_temp_snapshot() failure qemu-iotests: Add TestRepairQuorum to 041 to test drive-mirror node-name mode. block: Add replaces argument to drive-mirror blockjob: Fix recent BLOCK_JOB_ERROR regression blockjob: Fix recent BLOCK_JOB_READY regression virtio-blk: Rename complete_request_early to complete_request_vring virtio-blk: Unify {non-,}dataplane's request handlings virtio-blk: Schedule BH in the right context virtio-blk: Export request handling functions to dataplane virtio-blk: Make request completion function virtual block: acquire AioContext in qmp_query_blockstats() block: make bdrv_query_stats() static virtio-blk: Fix and clean up the in_sg and out_sg check virtio-blk: Fill in VirtIOBlockReq.out in dataplane code ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2014-06-27block.c: Don't return success for bdrv_append_temp_snapshot() failureChen Gang1-1/+1
When failure occurs, 'ret' need be set, or may return 0 to indicate success. Previously, an error was set in errp, but 0 was returned anyway. So let bdrv_append_temp_snapshot() return an error code and use that for the bdrv_open() return value. Also, error_propagate() need be called only one time within a function. Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-06-27block: Add replaces argument to drive-mirrorBenoît Canet2-0/+7
drive-mirror will bdrv_swap the new BDS named node-name with the one pointed by replaces when the mirroring is finished. Signed-off-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-06-27block: make bdrv_query_stats() staticStefan Hajnoczi1-1/+0
This function is only called from block/qapi.c. There is no need to keep it public. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com> Tested-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-06-27qapi event: clean up in callersWenchao Xia1-1/+1
This patch improves docs and address small issues in event callers. Signed-off-by: Wenchao Xia <wenchaoqemu@gmail.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2014-06-26block: Catch backing files assigned to non-COW driversKevin Wolf1-0/+3
Since we parse backing.* options to add a backing file from the command line when the driver didn't assign one, it has been possible to have a backing file for e.g. raw images (it just was never accessed). This is obvious nonsense and should be rejected. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2014-06-26blockjob: Add block_job_yield()Fam Zheng1-0/+8
This will unset busy flag and put coroutine to sleep, can be used to wait for QMP complete/cancel. Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-06-23qapi event: convert other BLOCK_JOB eventsWenchao Xia1-4/+13
Since BLOCK_JOB_COMPLETED, BLOCK_JOB_CANCELLED, BLOCK_JOB_READY are related, convert them in one patch. The block_job_event_* functions are used to keep encapsulation of BlockJob structure. Signed-off-by: Wenchao Xia <wenchaoqemu@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2014-06-23qapi event: convert BLOCK_IO_ERROR and BLOCK_JOB_ERRORWenchao Xia1-3/+0
Signed-off-by: Wenchao Xia <wenchaoqemu@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2014-06-23qapi: adjust existing definesWenchao Xia1-4/+0
In order to let event defines use existing types later, instead of redefine new ones, some old type defines for spice and vnc are changed, and BlockErrorAction is moved from block.h to qapi schema. Note that BlockErrorAction is not merged with BlockdevOnError. At this point, VncInfo is not made a child of VncBasicInfo, because VncBasicInfo has mandatory fields where VncInfo makes them optional. Signed-off-by: Wenchao Xia <wenchaoqemu@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2014-06-18scsi: Print command name in debugAlexey Kardashevskiy1-0/+2
This makes scsi_command_name() public. This makes use of scsi_command_name() in debug output for scsi-disk and spapr-vscsi host bus adapter. Before this, SCSI used to print hex numbers instead of human-friendly strings. This adds GET_EVENT_STATUS_NOTIFICATION and READ_DISC_INFORMATION to the list of SCSI commands supported by scsi_command_name(). Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-06-16cleanup QEMUOptionParameterChunyan Liu2-21/+5
Now that all backend drivers are using QemuOpts, remove all QEMUOptionParameter related codes. Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com> Signed-off-by: Chunyan Liu <cyliu@suse.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-06-16change block layer to support both QemuOpts and QEMUOptionParamterChunyan Liu2-4/+16
Change block layer to support both QemuOpts and QEMUOptionParameter. After this patch, it will change backend drivers one by one. At the end, QEMUOptionParameter will be removed and only QemuOpts is kept. Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com> Signed-off-by: Chunyan Liu <cyliu@suse.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-06-04block: Move declaration of bdrv_get_aio_context to block.hFam Zheng2-7/+7
block_int.h is for block layer and block drivers, other code shouldn't include it. But similar to bdrv_set_aio_context, bdrv_get_aio_context should also be accessible from outside of block layer. Move it. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>