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2012-10-30Issue warning when deprecated drive parameter boot=on|off is usedJan Kiszka1-0/+6
Releases of qemu-kvm will be interrupted at qemu 1.3.0. Users should switch to plain qemu releases. To avoid breaking scenarios which are setup with command line options specific to qemu-kvm, port these switches from qemu-kvm to qemu.git. Port drive boot option. From the qemu-kvm original commit message: We do not want to maintain this option forever. It will be removed after a grace period of a few releases. So warn the user that this option has no effect and will become invalid soon. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-10-24mirror: add support for on-source-error/on-target-errorPaolo Bonzini1-2/+12
Error management is important for mirroring; otherwise, an error on the target (even something as "innocent" as ENOSPC) requires to start again with a full copy. Similar to on_read_error/on_write_error, two separate knobs are provided for on_source_error (reads) and on_target_error (writes). The default is 'report' for both. The 'ignore' policy will leave the sector dirty, so that it will be retried later. Thus, it will not cause corruption. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24qmp: add drive-mirror commandPaolo Bonzini1-0/+124
This adds the monitor commands that start the mirroring job. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24block: introduce BLOCK_JOB_READY eventPaolo Bonzini1-14/+0
Even for jobs that need to be manually completed, management may want to take care itself of the completion, not requiring the user to issue a command to terminate the job. In this case we want to avoid that they poll us continuously, waiting for completion to become available. Thus, add a new event that signals the phase switch and the availability of the block-job-complete command. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24block: add block-job-completePaolo Bonzini1-0/+13
While streaming can be dropped as soon as it progressed through the whole image, mirroring needs to be completed manually for two reasons: 1) so that management knows exactly when the VM switches to the target; 2) because for other use cases such as replication, we may leave the operation running for the whole life of the virtual machine. Add a new block job command that manually completes background operations. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-24block: in commit, determine base image from the top imageJeff Cody1-10/+11
This simplifies some code and error checking, and also fixes a bug. bdrv_find_backing_image() should only be passed absolute filenames, or filenames relative to the chain. In the QMP message handler for block commit, when looking up the base do so from the determined top image, so we know it is reachable from top. Some of the error messages put out by block-commit have changed slightly, which causes 2 tests cases for block-commit to fail. This patch updates the test cases to look for the correct error output. Signed-off-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-10-05cleanup useless return sentenceAmos Kong1-1/+0
This patch cleans up return sentences in the end of void functions. Reported-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Amos Kong <akong@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
2012-09-28stream: add on-error argumentPaolo Bonzini1-3/+8
This patch adds support for error management to streaming. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28iostatus: change is_read to a boolPaolo Bonzini1-1/+1
Do this while we are touching this part of the code, before introducing more uses of "int is_read". Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28iostatus: move BlockdevOnError declaration to QAPIPaolo Bonzini1-7/+7
This will let block-stream reuse the enum. Places that used the enums are renamed accordingly. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28qmp: add block-job-pause and block-job-resumePaolo Bonzini1-2/+33
Add QMP commands matching the functionality. Paused jobs cannot be canceled without first resuming them. This ensures that I/O errors are never missed by management. However, an optional force argument can be specified to allow that. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28block: add support for job pause/resumePaolo Bonzini1-0/+4
Job pausing reuses the existing support for cancellable sleeps. A pause happens at the next sleeping point and lasts until the coroutine is re-entered explicitly. Cancellation was already doing a forced resume, so implement it explicitly in terms of resume. Paused jobs cannot be canceled without first resuming them. This ensures that I/O errors are never missed by management. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28block: add block_job_queryPaolo Bonzini1-13/+2
Extract it out of the implementation of info block-jobs. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28block: move job APIs to separate filesPaolo Bonzini1-0/+1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28qerror/block: introduce QERR_BLOCK_JOB_NOT_ACTIVEPaolo Bonzini1-2/+2
The DeviceNotActive text is not a particularly good match, add a separate text while keeping the same class. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28QAPI: add command for live block commit, 'block-commit'Jeff Cody1-0/+58
The command for live block commit is added, which has the following arguments: device: the block device to perform the commit on (mandatory) base: the base image to commit into; optional (if not specified, it is the underlying original image) top: the top image of the commit - all data from inside top down to base will be committed into base (mandatory for now; see note, below) speed: maximum speed, in bytes/sec Note: Eventually this command will support merging down the active layer, but that code is not yet complete. If the active layer is passed in as top, then an error will be returned. Once merging down the active layer is supported, the 'top' argument may become optional, and default to the active layer. The is done as a block job, so upon completion a BLOCK_JOB_COMPLETED will be emitted. Signed-off-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28blockdev: rename block_stream_cb to a generic block_job_cbJeff Cody1-3/+3
Signed-off-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28block: after creating a live snapshot, make old image read-onlyJeff Cody1-0/+5
Currently, after a live snapshot of a drive, the image that has been 'demoted' to be below the new active layer remains r/w. This patch reopens it read-only. Note that we do not check for error on the reopen(), because we will not abort the snapshots if the reopen fails. This patch depends on the bdrv_reopen() series. Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-24blockdev: preserve readonly and snapshot states across media changesKevin Shanahan1-0/+2
If readonly=on is given at device creation time, the ->readonly flag needs to be set in the block driver state for this device so that readonly-ness is preserved across media changes (qmp change command). Similarly, to preserve the snapshot property requires ->open_flags to be correct. Signed-off-by: Kevin Shanahan <kmshanah@disenchant.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-10blockdev: flip default cache mode from writethrough to writebackPaolo Bonzini1-0/+1
Now all major device models (IDE, SCSI, virtio) can choose between writethrough and writeback at run-time, and virtio will even revert to writethrough if the guest is not capable of sending flushes. So we can change the default to writeback at last. Tested, for lack of a better idea, with a breakpoint on bdrv_open and all cache choices one by one. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-02Support 'help' as a synonym for '?' in command line optionsPeter Maydell1-5/+5
For command line options which permit '?' meaning 'please list the permitted values', add support for 'help' as a synonym, by abstracting the check out into a helper function. This change means that in some cases where we were being lazy in our string parsing, "?junk" will now be rejected as an invalid option rather than being (undocumentedly) treated the same way as "?". Update the documentation to use 'help' rather than '?', since '?' is a shell metacharacter and thus prone to fail confusingly if there is a single character filename in the current working directory and the '?' has not been escaped. It's therefore better to steer users towards 'help', though '?' is retained for backwards compatibility. We do not, however, update the output of the system emulator's -help (or any documentation autogenerated from the qemu-options.hx which is the source of the -help text) because libvirt parses our -help output and will break. At a later date when QEMU provides a better interface so libvirt can avoid having to do this, we can update the -help text too. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-07-17blockdev: Don't limit DriveInfo serial to 20 charactersMarkus Armbruster1-3/+1
All current users (IDE, SCSI and virtio-blk) happen to share this 20 characters limit. Still, it should be left to device models. They already enforce their limits. They have to, as the DriveInfo limit only affects legacy -drive serial=..., not the qdev properties. usb-storage, which doesn't limit serial number length, also uses DriveInfo for -usbdevice. But that doesn't provide access to DriveInfo serial. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-17blockdev: Drop redundant CHS validation for if=ideMarkus Armbruster1-3/+3
Leave it to ide_init_drive(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-17block: Geometry and translation hints are now useless, purge themMarkus Armbruster1-12/+2
There are two producers of these hints: drive_init() on behalf of -drive, and hd_geometry_guess(). The only consumer of the hint is hd_geometry_guess(). The callers of hd_geometry_guess() call it only when drive_init() didn't set the hints. Therefore, drive_init()'s hints are never used. Thus, hd_geometry_guess() only ever sees hints it produced itself in a prior call. Only the first call computes something, subsequent calls just repeat the first call's results. However, hd_geometry_guess() is never called more than once: the device models don't, and the block device is destroyed on unplug. Thus, dropping the repeat feature doesn't break anything now. If a block device wasn't destroyed on unplug and could be reused with a new device, then repeating old results would be wrong. Thus, dropping the repeat feature prevents future breakage. This renders the hints unused. Purge them from the block layer. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-17blockdev: Save geometry in DriveInfoMarkus Armbruster1-0/+4
In preparation of purging it from the block layer, which will happen later in this series. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-09blockdev: warn when copy_on_read=on and readonly=onStefan Hajnoczi1-0/+4
If the image is read-only then it's not possible to copy read data into it. Therefore copy-on-read is automatically disabled for read-only images. Up until now this behavior was silent, add a warning so the user knows why copy-on-read is not working. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-06-15block: Simplify how drive_init() computes default IDMarkus Armbruster1-5/+2
Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-06-04qemu-option: qemu_opts_create(): use error_set()Luiz Capitulino1-1/+1
This commit converts qemu_opts_create() from qerror_report() to error_set(). Currently, most calls to qemu_opts_create() can't fail, so most callers don't need any changes. The two cases where code checks for qemu_opts_create() erros are: 1. Initialization code in vl.c. All of them print their own error messages directly to stderr, no need to pass the Error object 2. The functions opts_parse(), qemu_opts_from_qdict() and qemu_chr_parse_compat() make use of the error information and they can be called from HMP or QMP. In this case, to allow for incremental conversion, we propagate the error up using qerror_report_err(), which keeps the QError semantics Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-By: Laszlo Ersek <lersek@redhat.com>
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>
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