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2012-05-10block: fail live snapshot if disk has no mediumPaolo Bonzini1-3/+6
Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-04-27block: add 'speed' optional parameter to block-streamStefan Hajnoczi1-2/+4
Allow streaming operations to be started with an initial speed limit. This eliminates the window of time between starting streaming and issuing block-job-set-speed. Users should use the new optional 'speed' parameter instead so that speed limits are in effect immediately when the job starts. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-04-27block: change block-job-set-speed argument from 'value' to 'speed'Stefan Hajnoczi1-2/+2
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-04-27block: use Error mechanism instead of -errno for block_job_set_speed()Stefan Hajnoczi1-3/+1
There are at least two different errors that can occur in block_job_set_speed(): the job might not support setting speeds or the value might be invalid. Use the Error mechanism to report the error where it occurs. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-04-27block: use Error mechanism instead of -errno for block_job_create()Stefan Hajnoczi1-11/+5
The block job API uses -errno return values internally and we convert these to Error in the QMP functions. This is ugly because the Error should be created at the point where we still have all the relevant information. More importantly, it is hard to add new error cases to this case since we quickly run out of -errno values without losing information. Go ahead and use Error directly and don't convert later. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-04-05blockdev: open images with BDRV_O_INCOMING on incoming live migrationBenoît Canet1-0/+4
Open images with BDRV_O_INCOMING in order to inform block drivers that an incoming live migration is coming. Signed-off-by: Benoit Canet <benoit.canet@gmail.com> Reviewed-by: Stefan Hajnoczi <stefanha@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-04-05block: cancel jobs when a device is ready to go awayPaolo Bonzini1-0/+3
We do not want jobs to keep a device busy for a possibly very long time, and management could become confused because they thought a device was not even there anymore. So, cancel long-running jobs as soon as their device is going to disappear. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-04-05ide: Change serial number strncpy() to pstrcpy()Floris Bos1-2/+3
strncpy may not null-terminate the destination string. Cc: kwolf@redhat.com Signed-off-by: Floris Bos <dev@noc-ps.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-03-12qmp: convert blockdev-snapshot-sync to a wrapper around transactionsPaolo Bonzini1-62/+23
Simplify the blockdev-snapshot-sync code and gain failsafe operation by turning it into a wrapper around the new transaction command. A new option is also added matching "mode". Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-03-12add mode field to blockdev-snapshot-sync transaction itemPaolo Bonzini1-9/+16
The mode field lets a management application create the snapshot destination outside QEMU. Right now, the only modes are "existing" and "absolute-paths". Mirroring introduces "no-backing-file". In the future "relative-paths" could be implemented too. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-03-12rename blockdev-group-snapshot-syncPaolo Bonzini1-37/+41
We will add other kinds of operation. Prepare for this by adjusting the schema. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-03-12use QSIMPLEQ_FOREACH_SAFE when freeing list elementsPaolo Bonzini1-2/+2
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-03-12block: handle -EBUSY in bdrv_commit_all()Stefan Hajnoczi1-3/+6
Monitor operations that manipulate image files must not execute while a background job (like image streaming) is in progress. This prevents corruptions from happening when two pieces of code are manipulating the image file without knowledge of each other. The monitor "commit" command raises QERR_DEVICE_IN_USE when bdrv_commit() returns -EBUSY but "commit all" has no error handling. This is easy to fix, although note that we do not deliver a detailed error about which device was busy in the "commit all" case. Suggested-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-03-12Group snapshot: Fix format name for backing filePaolo Bonzini1-1/+2
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-02-29qapi: Introduce blockdev-group-snapshot-sync commandJeff Cody1-0/+131
This is a QAPI/QMP only command to take a snapshot of a group of devices. This is similar to the blockdev-snapshot-sync command, except blockdev-group-snapshot-sync accepts a list devices, filenames, and formats. It is attempted to keep the snapshot of the group atomic; if the creation or open of any of the new snapshots fails, then all of the new snapshots are abandoned, and the name of the snapshot image that failed is returned. The failure case should not interrupt any operations. Rather than use bdrv_close() along with a subsequent bdrv_open() to perform the pivot, the original image is never closed and the new image is placed 'in front' of the original image via manipulation of the BlockDriverState fields. Thus, once the new snapshot image has been successfully created, there are no more failure points before pivoting to the new snapshot. This allows the group of disks to remain consistent with each other, even across snapshot failures. Signed-off-by: Jeff Cody <jcody@redhat.com> Acked-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-02-22blockdev: allow read-only pflash devicesJordan Justen1-1/+2
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-02-03Fix build breakage from last commit.Anthony Liguori1-0/+1
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-02-03s390x: fix -drive in the absence of aliasesAnthony Liguori1-1/+5
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-01-26block: add support for partial streamingMarcelo Tosatti1-4/+7
Add support for streaming data from an intermediate section of the image chain (see patch and documentation for details). Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-01-26blockdev: make image streaming safe across hotplugStefan Hajnoczi1-0/+38
Unplugging a storage interface like virtio-blk causes the host block device to be deleted too. Long-running operations like block migration must take a DriveInfo reference to prevent the BlockDriverState from being freed. For image streaming we can do the same thing. Note that it is not possible to acquire/release the drive reference in block.c where the block job functions live because drive_get_ref()/drive_put_ref() are blockdev.c functions. Calling them from block.c would be a layering violation - tools like qemu-img don't even link against blockdev.c. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-01-26qmp: add query-block-jobsStefan Hajnoczi1-0/+33
Add query-block-jobs, which shows the progress of ongoing block device operations. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-01-26qmp: add block_job_cancel commandStefan Hajnoczi1-1/+18
Add block_job_cancel, which stops an active block streaming operation. When the operation has been cancelled the new BLOCK_JOB_CANCELLED event is emitted. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-01-26qmp: add block_job_set_speed commandStefan Hajnoczi1-0/+25
Add block_job_set_speed, which sets the maximum speed for a background block operation. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-01-26qmp: add block_stream commandStefan Hajnoczi1-0/+67
Add the block_stream command, which starts copy backing file contents into the image file. Also add the BLOCK_JOB_COMPLETED QMP event which is emitted when image streaming completes. Later patches add control over the background copy speed, cancelation, and querying running streaming operations. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-01-26block: check bdrv_in_use() before blockdev operationsStefan Hajnoczi1-1/+15
Long-running block operations like block migration and image streaming must have continual access to their block device. It is not safe to perform operations like hotplug, eject, change, resize, commit, or external snapshot while a long-running operation is in progress. This patch adds the missing bdrv_in_use() checks so that block migration and image streaming never have the rug pulled out from underneath them. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-01-18block: use proper qerrors in qmp_block_resizeStefan Hajnoczi1-8/+18
Let's report specific errors so that management tools and users can identify the problem. Two new qerrors are needed: * QERR_DEVICE_HAS_NO_MEDIUM for ENOMEDIUM * QERR_DEVICE_IS_READ_ONLY for EACCES Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-01-18qapi: Convert block_set_io_throttleLuiz Capitulino1-33/+14
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-01-18qapi: Convert changeLuiz Capitulino1-16/+38
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-01-18qapi: Convert ejectLuiz Capitulino1-15/+5
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-01-18block: eject_device(): Use error_set()Luiz Capitulino1-8/+22
Also drops the leftover 'mon' argument. This is a preparation for the next commits which will port the eject and change commands to the QAPI. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2011-12-06qapi: Convert blockdev_snapshot_syncLuiz Capitulino1-32/+17
Unfortunately, this conversion required an additional change. In the old QMP command, the 'snapshot-file' argument is specified as optional. The idea is to take the snapshot internally if 'snapshot-file' is not passed. However, internal snapshots are not supported yet so the command returns a MissingParamater error if 'snapshot-file' is not passed. Which makes the argument actually required and will cause compatibility breakage if we change that in the future. To fix this the QAPI converted blockdev_snapshot_sync command makes the 'snapshot-file' argument required. Again, in practice it's actually required, so this is not incompatible. If we do implement internal snapshots someday, we'll need a new argument for it. Note that this discussion doesn't affect HMP. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2011-12-06qapi: Convert block_resizeLuiz Capitulino1-11/+7
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2011-12-06qapi: Convert block_passwdLuiz Capitulino1-12/+10
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2011-12-05block: convert qemu_aio_flush() calls to bdrv_drain_all()Stefan Hajnoczi1-2/+2
Many places in QEMU call qemu_aio_flush() to complete all pending asynchronous I/O. Most of these places actually want to drain all block requests but there is no block layer API to do so. This patch introduces the bdrv_drain_all() API to wait for requests across all BlockDriverStates to complete. As a bonus we perform checks after qemu_aio_wait() to ensure that requests really have finished. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-12-05block: add -drive copy-on-read=on|offStefan Hajnoczi1-0/+6
This patch adds the -drive copy-on-read=on|off command-line option: copy-on-read=on|off copy-on-read is "on" or "off" and enables whether to copy read backing file sectors into the image file. Copy-on-read avoids accessing the same backing file sectors repeatedly and is useful when the backing file is over a slow network. By default copy-on-read is off. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-12-05hmp/qmp: add block_set_io_throttleZhi Yong Wu1-0/+59
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-12-05block: add the blockio limits command line supportZhi Yong Wu1-0/+44
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-11block: add eject request callbackPaolo Bonzini1-4/+6
Recent versions of udev always keep the tray locked so that the kernel can observe "eject request" events (aka tray button presses) even on discs that aren't mounted. Add support for these events in the ATAPI and SCSI cd drive device models. To let management cope with the behavior of udev, an event should also be added for "tray opened/closed". This way, after issuing an "eject" command, management can poll until the guests actually reacts to the command. They can then issue the "change" command after the tray has been opened, or try with "eject -f" after a (configurable?) timeout. However, with this patch and the corresponding support in the device models, at least it is possible to do a manual two-step eject+change sequence. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-12ide/atapi scsi-disk: Make monitor eject -f, then change workMarkus Armbruster1-1/+2
change fails while the tray is locked by the guest. eject -f forces it open and removes any media. Unfortunately, the tray closes again instantly. Since the lock remains as it is, there is no way to insert another medium unless the guest voluntarily unlocks. Fix by leaving the tray open after monitor eject. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-12block: Drop BlockDriverState member removableMarkus Armbruster1-5/+0
It's a confused mess (see previous commit). No users remain. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-12block: Clean up remaining users of "removable"Markus Armbruster1-1/+1
BlockDriverState member removable is a confused mess. It is true when an ide-cd, scsi-cd or floppy qdev is attached, or when the BlockDriverState was created with -drive if={floppy,sd} or -drive if={ide,scsi,xen,none},media=cdrom ("created removable"), except when an ide-hd, scsi-hd, scsi-generic or virtio-blk qdev is attached. Three users remain: 1. eject_device(), via bdrv_is_removable() uses it to determine whether a block device can eject media. 2. bdrv_info() is monitor command "info block". QMP documentation says "true if the device is removable, false otherwise". From the monitor user's point of view, the only sensible interpretation of "is removable" is "can eject media with monitor commands eject and change". A block device can eject media unless a device is attached that doesn't support it. Switch the two users over to new bdrv_dev_has_removable_media() that returns exactly that. 3. bdrv_getlength() uses to suppress its length cache when media can change (see commit 46a4e4e6). Media change is either monitor command change (updates the length cache), monitor command eject (doesn't update the length cache, easily fixable), or physical media change (invalidates length cache, not so easily fixable). I'm refraining from improving anything here, because this series is long enough already. Instead, I simply switch it over to bdrv_dev_has_removable_media() as well. This changes the behavior of the length cache and of monitor commands eject and change in two cases: a. drive not created removable, no device attached The commit makes the drive removable, and defeats the length cache. Example: -drive if=none b. drive created removable, but the attached drive is non-removable, and doesn't call bdrv_set_removable(..., 0) (most devices don't) The commit makes the drive non-removable, and enables the length cache. Example: -drive if=xen,media=cdrom -M xenpv The other non-removable devices that don't call bdrv_set_removable() can't currently use a drive created removable, either because they aren't qdevified, or because they lack a drive property. Won't stay that way. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-12block: Drop medium lock tracking, ask device models insteadMarkus Armbruster1-1/+1
Requires new BlockDevOps member is_medium_locked(). Implement for IDE and SCSI CD-ROMs. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-06block: Attach non-qdev devices as wellMarkus Armbruster1-3/+2
For now, this just protects against programming errors like having the same drive back multiple non-qdev devices, or untimely bdrv_delete(). Later commits will add other interesting uses. While there, rename BlockDriverState member peer to dev, bdrv_attach() to bdrv_attach_dev(), bdrv_detach() to bdrv_detach_dev(), and bdrv_get_attached() to bdrv_get_attached_dev(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-08-23block: parse cache mode flags in a single placeStefan Hajnoczi1-12/+3
This patch introduces bdrv_parse_cache_flags() which sets open flags given a cache mode. Previously this was duplicated in blockdev.c and qemu-img.c. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-08-20Use glib memory allocation and free functionsAnthony Liguori1-7/+7
qemu_malloc/qemu_free no longer exist after this commit. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-08-01blockdev: Make eject fail for non-removable drives even with -fMarkus Armbruster1-10/+7
Ejecting hard disk platters can only end in tears. If you need to revoke access to an image, use drive_del, not eject -f. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-07-21QMP: add snapshot-blkdev-sync commandJes Sorensen1-2/+2
Add QMP bits for snapshot_blkdev command. This is the same as snapshot_blkdev in the human monitor. The command is synchronous. In the future async commands and or a break down of the functionality into multiple commands might be added. Also change the 'snapshot_file' argument to 'snapshot-file' in the human monitor, so that it matches QMP. Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@gmail.com>
2011-07-05block: drive_init(): Improve CHS setting error messageLuiz Capitulino1-1/+1
The current message doesn't clearly communicate the error cause. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-07-05block: drive_init(): Simplify interface type settingLuiz Capitulino1-8/+4
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-06-24blockdev: Put space after comma in error messageMarkus Armbruster1-1/+1
Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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