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2013-03-15threadpool: drop global thread poolStefan Hajnoczi2-3/+9
Now that each AioContext has a ThreadPool and the main loop AioContext can be fetched with bdrv_get_aio_context(), we can eliminate the concept of a global thread pool from thread-pool.c. The submit functions must take a ThreadPool* argument. block/raw-posix.c and block/raw-win32.c use aio_get_thread_pool(bdrv_get_aio_context(bs)) to fetch the main loop's ThreadPool. tests/test-thread-pool.c must be updated to reflect the new thread_pool_submit() function prototypes. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2013-03-15sheepdog: set io_flush handler in do_co_reqMORITA Kazutaka1-2/+11
If an io_flush handler is not set, qemu_aio_wait doesn't invoke callbacks. Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-15sheepdog: use non-blocking fd in coroutine contextMORITA Kazutaka1-4/+2
Using a blocking socket in the coroutine context reduces the chance of switching to other work. This patch makes the sheepdog driver use a non-blocking fd always. Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-15qcow2: make is_allocated return true for zero clustersPaolo Bonzini2-5/+4
Otherwise, live migration of the top layer will miss zero clusters and let the backing file show through. This also matches what is done in qed. QCOW2_CLUSTER_ZERO clusters are invalid in v2 image files. Check this directly in qcow2_get_cluster_offset instead of replicating the test everywhere. Cc: qemu-stable@nongnu.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-15qcow2: drop unnecessary flush in qcow2_update_snapshot_refcount()Stefan Hajnoczi1-4/+0
We already flush when the function completes. There is no need to flush after every compressed cluster. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-03-15qcow2: drop flush in update_cluster_refcount()Stefan Hajnoczi1-2/+0
The update_cluster_refcount() function increments/decrements a cluster's refcount and then returns the new refcount value. There is no need to flush since both update_cluster_refcount() callers already take care of this: 1. qcow2_alloc_bytes() calls update_cluster_refcount() when compressed sectors will be appended to an existing cluster with enough free space. qcow2_alloc_bytes() already flushes so there is no need to do so in update_cluster_refcount(). 2. qcow2_update_snapshot_refcount() sets a cache dependency on refcounts if it needs to update L2 entries. It also flushes before completing. Removing this flush significantly speeds up qcow2 snapshot creation: $ qemu-img create -f qcow2 test.qcow2 -o size=50G,preallocation=metadata $ time qemu-img snapshot -c new test.qcow2 Time drops from more than 3 minutes to under 1 second. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-03-15qcow2: flush in qcow2_update_snapshot_refcount()Stefan Hajnoczi2-6/+1
Users of qcow2_update_snapshot_refcount() do not flush consistently. qcow2_snapshot_create() flushes but qcow2_snapshot_goto() and qcow2_snapshot_delete() do not. Solve this by moving the bdrv_flush() into qcow2_update_snapshot_refcount(). Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-03-15qcow2: set L2 cache dependency in qcow2_alloc_bytes()Stefan Hajnoczi1-1/+5
Compressed writes use qcow2_alloc_bytes() to allocate space with byte granularity. The affected clusters' refcounts will be incremented but we do not need to flush yet. Set a L2 cache dependency on the refcount block cache, so that the refcounts get written out before the L2 updates. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-03-15qcow2: flush refcount cache correctly in qcow2_write_snapshots()Stefan Hajnoczi1-1/+4
Since qcow2 metadata is cached we need to flush the caches, not just the underlying file. Use bdrv_flush(bs) instead of bdrv_flush(bs->file). Also add the error return path when bdrv_flush() fails and move the flush after checking for qcow2_alloc_clusters() failure so that the qcow2_alloc_clusters() error return value takes precedence. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-03-15qcow2: flush refcount cache correctly in alloc_refcount_block()Stefan Hajnoczi1-2/+8
update_refcount() affects the refcount cache, it does not write to disk. Therefore bdrv_flush(bs->file) does nothing. We need to flush the refcount cache in order to write out the refcount updates! While we're here also add error returns when qcow2_cache_flush() fails. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-03-15qcow2: Allow lazy refcounts to be enabled on the command lineKevin Wolf3-1/+39
qcow2 images now accept a boolean lazy_refcounts options. Use it like this: -drive file=test.qcow2,lazy_refcounts=on If the option is specified on the command line, it overrides the default specified by the qcow2 header flags that were set when creating the image. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-15block: Add options QDict to bdrv_open() prototypeKevin Wolf4-4/+4
It doesn't do anything yet except storing the options QDict in the BlockDriverState. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-15block: Add options QDict to .bdrv_open()Kevin Wolf12-14/+14
Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-05iscsi: add iscsi_truncate supportPeter Lieven1-47/+88
this patch adds iscsi_truncate which effectively allows for online resizing of iscsi volumes. for this to work you have to resize the volume on your storage and then call block_resize command in qemu which will issue a readcapacity16 to update the capacity. v4: - factor out complete readcapacity logic into a separate function - handle capacity change check condition in readcapacity function (this happens if the block_resize cmd is the first iscsi task executed after a resize on the storage) v3: - remove switch statement in iscsi_open - create separate patch for brdv_drain_all() in bdrv_truncate() v2: - add a general bdrv_drain_all() before bdrv_truncate() to avoid in-flight AIOs while the device is truncated - since no AIOs are in flight we can use a sync libiscsi call to re-read the capacity - factor out the readcapacity16 logic as it is redundant to iscsi_open() and iscsi_truncate(). Signed-off-by: Peter Lieven <pl@kamp.de> [allow any type of unit attention check condition in iscsi_readcapacity_sync(), as in Message-ID: <51263A2A.6070304@dlhnet.de> - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-03-05iscsi: retry read, write, flush and unmap on unit attention check conditionsPeter Lieven1-88/+203
the storage might return a check condition status for various reasons. (e.g. bus reset, capacity change, thin-provisioning info etc.) currently all these informative status responses lead to an I/O error which is populated to the guest. this patch introduces a retry mechanism to avoid this. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-03-04sheepdog: add support for connecting to unix domain socketMORITA Kazutaka1-12/+70
This patch adds support for a unix domain socket for a connection between qemu and local sheepdog server. You can use the unix domain socket with the following syntax: $ qemu sheepdog+unix:///<vdiname>?socket=<socket path>[#snapid] Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-04sheepdog: use inet_connect to simplify connect codeMORITA Kazutaka1-81/+30
This uses the form "<host>:<port>" for the representation of the sheepdog server to use inet_connect. Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-04sheepdog: accept URIsMORITA Kazutaka1-34/+105
The URI syntax is consistent with the NBD and Gluster syntax. The syntax is sheepdog[+tcp]://[host:port]/vdiname[#snapid|#tag] Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-04move socket_set_nodelay to osdep.cMORITA Kazutaka1-10/+1
Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-22qcow2: support compressed clusters in BlockFragInfoStefan Hajnoczi1-0/+1
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-22qcow2: record fragmentation statistics during checkStefan Hajnoczi1-1/+24
The qemu-img check command can display fragmentation statistics: * Total number of clusters in virtual disk * Number of allocated clusters * Number of fragmented clusters This patch adds fragmentation statistics support to qcow2. Compressed and normal clusters count as allocated. Zero clusters are not counted as allocated unless their L2 entry has a non-zero offset (e.g. preallocation). Only the current L1 table counts towards the statistics - snapshots are ignored. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-22qcow2: introduce check_refcounts_l1/l2() flagsStefan Hajnoczi1-6/+12
The check_refcounts_l1/l2() functions have a check_copied argument to check that the QCOW_O_COPIED flag is consistent with refcount == 1. This should be a bool, not an int. However, the next patch introduces qcow2 fragmentation statistics and also needs to pass an option to check_refcounts_l1/l2(). This is a good opportunity to use an int flags field. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-22qemu-img: find the image end offset during checkFederico Simoncelli1-2/+8
This patch adds the support for reporting the image end offset (in bytes). This is particularly useful after a conversion (or a rebase) where the destination is a block device in order to find the first unused byte at the end of the image. Signed-off-by: Federico Simoncelli <fsimonce@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-02-13block/curl: only restrict protocols with libcurl>=7.19.4Stefan Hajnoczi1-0/+4
The curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, ...) interface was introduced in libcurl 7.19.4. Therefore we cannot protect against CVE-2013-0249 when linking against an older libcurl. This fixes the build failure introduced by fb6d1bbd246c7a57ef53d3847ef225cd1349d602. Reported-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Tested-by: Andreas Färber <andreas.faeber@web.de> Message-id: 1360743934-8337-1-git-send-email-stefanha@redhat.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-02-12Revert "block/vpc: Fix size calculation"Stefan Hajnoczi1-9/+5
This reverts commit f880defbb06708d30a38ce9f2667067626acdd38. Jeff Cody's testing revealed that the interpretation of size differs even between VirtualPC and HyperV. Revert this so there is time to consider the impact of any backwards incompatible behavior this change creates. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-12block/raw-posix: detect readonly Linux block devices using BLKROGETStefan Hajnoczi1-1/+48
Linux block devices can be set read-only with "blockdev --setro <device>". The same thing can be done for LVM volumes using "lvchange --permission r <volume>". This read-only setting is independent of device node permissions. Therefore the device can still be opened O_RDWR but actual writes will fail. This results in odd behavior for QEMU. bdrv_open() is supposed to fail if a read-only image is being opened with BDRV_O_RDWR. By not failing for Linux block devices, the guest boots up but every write produces an I/O error. This patch checks whether the block device is read-only so that Linux block devices behave like regular files. Reported-by: Sibiao Luo <sluo@redhat.com> Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-02-11block/vpc: Fix size calculationStefan Weil1-5/+9
The size calculated from the CHS values is not the real image (disk) size, but usually a smaller value. This is caused by rounding effects. Only older operating systems use CHS. Such guests won't be able to use the whole disk. All modern operating systems use the real size. This patch fixes https://bugs.launchpad.net/qemu/+bug/1105670/. Signed-off-by: Stefan Weil <sw@weilnetz.de> Message-id: 1360265212-22037-1-git-send-email-sw@weilnetz.de Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-02-11error: Strip trailing '\n' from error string arguments (again)Markus Armbruster1-1/+1
Commit 6daf194d and be62a2eb got rid of a bunch, but they keep coming back. Tracked down with this Coccinelle semantic patch: @r@ expression err, eno, cls, fmt; position p; @@ ( error_report(fmt, ...)@p | error_set(err, cls, fmt, ...)@p | error_set_errno(err, eno, cls, fmt, ...)@p | error_setg(err, fmt, ...)@p | error_setg_errno(err, eno, fmt, ...)@p ) @script:python@ fmt << r.fmt; p << r.p; @@ if "\\n" in str(fmt): print "%s:%s:%s:%s" % (p[0].file, p[0].line, p[0].column, fmt) Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-id: 1360354939-10994-4-git-send-email-armbru@redhat.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-02-08block/curl: disable extra protocols to prevent CVE-2013-0249Stefan Hajnoczi1-0/+11
There is a buffer overflow in libcurl POP3/SMTP/IMAP. The workaround is simple: disable extra protocols so that they cannot be exploited. Full details here: http://curl.haxx.se/docs/adv_20130206.html QEMU only cares about HTTP, HTTPS, FTP, FTPS, and TFTP. I have tested that this fix prevents the exploit on my host with libcurl-7.27.0-5.fc18. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-02-01block/raw-posix: Build fix for O_ASYNCAndreas Färber1-1/+10
Commit eeb6b45d48800e96f67ef2a5c80332557fd45ddb (block: raw-posix image file reopen) broke the build on OpenIndiana. illumos has no O_ASYNC. Exclude it from flags to be compared and instead assert that it is not set where defined. Cf. e61ab1da7e98357da47c54d8f893b9bd6ff2f7f9 for qemu-ga. Cc: qemu-stable@nongnu.org (1.3.x) Cc: Jeff Cody <jcody@redhat.com> Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Andreas Färber <andreas.faerber@web.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-01vmdk: Allow space in file namePhilipp Hahn1-9/+1
The previous scanf() format string stopped parsing the file name on the first white white space, which seems to be allowed at least by VMware Workstation. Change the format string to collect everything between the first and second quote as the file name, disallowing line breaks. Signed-off-by: Philipp Hahn <hahn@univention.de> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-01parallels: Fix bdrv_open() error handlingKevin Wolf1-8/+15
Return -errno instead of -1 on errors. Hey, no memory leak to fix here while we're touching it! Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-01dmg: Use g_free instead of freeKevin Wolf1-9/+9
The buffers are allocated with g_(re)alloc, so use g_free to free them. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-01dmg: Fix bdrv_open() error handlingKevin Wolf1-38/+97
Return -errno instead of -1 on errors and add error checks in some places that didn't have one. Passing things by reference requires more correct typing, replaced a few off_ts therefore - with a 32-bit off_t this is even a fix for truncation bugs. While touching the code, fix even some more memory leaks than in the other drivers... Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-01vpc: Fix bdrv_open() error handlingKevin Wolf1-12/+30
Return -errno instead of -1 on errors. While touching the code, fix a memory leak. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-01cloop: Fix bdrv_open() error handlingKevin Wolf1-10/+19
Return -errno instead of -1 on errors. While touching the code, fix a memory leak. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-01bochs: Fix bdrv_open() error handlingKevin Wolf1-7/+15
Return -errno instead of -1 on errors. While touching the code, fix a memory leak. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-01sheepdog: pass vdi_id to sheep daemon for sd_close()Liu Yuan1-2/+3
Sheep daemon needs vdi_id to identify which vdi is closed to release resources such as object cache. Cc: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Cc: Kevin Wolf <kwolf@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Liu Yuan <tailai.ly@taobao.com> Reviewed-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-01vmdk: Allow selecting SCSI adapter in image creationOthmar Pasteka1-3/+28
Introduce a new option "adapter_type" when converting to vmdk images. It can be one of the following: ide (default), buslogic, lsilogic or legacyESX (according to the vmdk spec from vmware). In case of a non-ide adapter, heads is set to 255 instead of the 16. The latter is used for "ide". Also see LP#545089 Signed-off-by: Othmar Pasteka <pasteka@kabsi.at> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-01-30g_malloc(0) and g_malloc0(0) return NULL; simplifyMarkus Armbruster2-8/+2
Once upon a time, it was decided that qemu_malloc(0) should abort. Switching to glib retired that bright idea. Some code that was added to cope with it (e.g. in commits 702ef63, b76b6e9) is still around. Bury it. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-01-25mirror: do nothing on zero-sized diskPaolo Bonzini1-1/+1
On a zero-sized disk we need to break out of the job successfully before bdrv_dirty_iter_init is called, otherwise you will get an assertion failure with the next patch. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-01-25block/vdi: Check for bad signatureStefan Weil1-1/+5
vdi_open did not check for a bad signature. This check was only in vdi_probe. Signed-off-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-01-25block/vdi: Improved return values from vdi_openStefan Weil1-3/+14
vdi_open returned -1 in case of any error, but it should return an error code (negative value of errno or -EMEDIUMTYPE). Signed-off-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-01-25block/vdi: Improve debug output for signatureStefan Weil1-1/+1
The signature is a 32 bit value and needs up to 8 hex digits for printing. Signed-off-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-01-25block: Use error code EMEDIUMTYPE for wrong format in some block driversStefan Weil6-7/+7
This improves error reports for bochs, cow, qcow, qcow2, qed and vmdk when a file with the wrong format is selected. Signed-off-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-01-25mirror: support arbitrarily-sized iterationsPaolo Bonzini1-30/+67
Yet another optimization is to extend the mirroring iteration to include more adjacent dirty blocks. This limits the number of I/O operations and makes mirroring efficient even with a small granularity. Most of the infrastructure is already in place; we only need to put a loop around the computation of the origin and sector count of the iteration. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-01-25mirror: support more than one in-flight AIO operationPaolo Bonzini1-11/+91
With AIO support in place, we can start copying more than one chunk in parallel. This patch introduces the required infrastructure for this: the buffer is split into multiple granularity-sized chunks, and there is a free list to access them. Because of copy-on-write, a single operation may already require multiple chunks to be available on the free list. In addition, two different iterations on the HBitmap may want to copy the same cluster. We avoid this by keeping a bitmap of in-flight I/O operations, and blocking until the previous iteration completes. This should be a pretty rare occurrence, though; as long as there is no overlap the next iteration can start before the previous one finishes. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-01-25mirror: add buf-size argument to drive-mirrorPaolo Bonzini1-4/+4
This makes sense when the next commit starts using the extra buffer space to perform many I/O operations asynchronously. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-01-25mirror: switch mirror_iteration to AIOPaolo Bonzini1-41/+126
There is really no change in the behavior of the job here, since there is still a maximum of one in-flight I/O operation between the source and the target. However, this patch already introduces the AIO callbacks (which are unmodified in the next patch) and some of the logic to count in-flight operations and only complete the job when there is none. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-01-25mirror: allow customizing the granularityPaolo Bonzini1-19/+33
The desired granularity may be very different depending on the kind of operation (e.g. continuous replication vs. collapse-to-raw) and whether the VM is expected to perform lots of I/O while mirroring is in progress. Allow the user to customize it, while providing a sane default so that in general there will be no extra allocated space in the target compared to the source. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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