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2014-03-13block/raw-posix: Strip protocol prefix on creationMax Reitz1-0/+12
The hdev_create() implementation in block/raw-posix.c is used by the "host_device", "host_cdrom" and "host_floppy" protocol block drivers together. Thus, any of the associated prefixes may occur and exactly one should should be stripped, if it does (thus, "host_device:host_cdrom:/dev/cdrom" is not shortened to "/dev/cdrom"). Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-03-13block/raw-posix: bdrv_parse_filename() for cdromMax Reitz1-0/+15
The "host_cdrom" protocol drivers should strip the "host_cdrom:" prefix from filenames if present. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-03-13block/raw-posix: bdrv_parse_filename() for floppyMax Reitz1-0/+10
The "host_floppy" protocol driver should strip the "host_floppy:" prefix from filenames if present. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-03-13block/raw-posix: bdrv_parse_filename() for hdevMax Reitz1-0/+10
The "host_device" protocol driver should strip the "host_device:" prefix from filenames if present. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-03-06block/raw-posix: Strip "file:" prefix on creationMax Reitz1-0/+2
The bdrv_create() implementation of the block/raw-posix "file" protocol driver should strip the "file:" prefix from filenames if present. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-03-06block/raw-posix: Implement bdrv_parse_filename()Max Reitz1-0/+12
The "file" protocol driver should strip the "file:" prefix from filenames if present. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-02-17Use error_is_set() only when necessaryMarkus Armbruster1-6/+6
error_is_set(&var) is the same as var != NULL, but it takes whole-program analysis to figure that out. Unnecessarily hard for optimizers, static checkers, and human readers. Dumb it down to obvious. Gets rid of several dozen Coverity false positives. Note that the obvious form is already used in many places. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2014-01-24raw: Probe required direct I/O alignmentPaolo Bonzini1-17/+85
Add a bs->request_alignment field that contains the required offset/length alignment for I/O requests and fill it in the raw block drivers. Use ioctls if possible, else see what alignment it takes for O_DIRECT to succeed. While at it, also expose the memory alignment requirements, which may be (and in practice are) different from the disk alignment requirements. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>
2014-01-06qemu-option: Remove qemu_opts_create_nofailPeter Crosthwaite1-1/+1
This is a boiler-plate _nofail variant of qemu_opts_create. Remove and use error_abort in call sites. null/0 arguments needs to be added for the id and fail_if_exists fields in affected callsites due to argument inconsistency between the normal and no_fail variants. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2013-12-03raw-posix: add support for write_zeroes on XFS and block devicesPaolo Bonzini1-12/+72
The code is similar to the implementation of discard and write_zeroes with UNMAP. However, failure must be propagated up to block.c. The stale page cache problem can be reproduced as follows: # modprobe scsi-debug lbpws=1 lbprz=1 # ./qemu-io /dev/sdXX qemu-io> write -P 0xcc 0 2M qemu-io> write -z 0 1M qemu-io> read -P 0x00 0 512 Pattern verification failed at offset 0, 512 bytes qemu-io> read -v 0 512 00000000: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................ ... # ./qemu-io --cache=none /dev/sdXX qemu-io> write -P 0xcc 0 2M qemu-io> write -z 0 1M qemu-io> read -P 0x00 0 512 qemu-io> read -v 0 512 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ ... And similarly with discard instead of "write -z". Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-12-03raw-posix: implement write_zeroes with MAY_UNMAP for block devicesPaolo Bonzini1-0/+37
See the next commit for the description of the Linux kernel problem that is worked around in raw_open_common. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-12-03raw-posix: implement write_zeroes with MAY_UNMAP for filesPaolo Bonzini1-2/+64
Writing zeroes to a file can be done by punching a hole if MAY_UNMAP is set. Note that in this case ENOTSUP is not ignored, but makes the block layer fall back to the generic implementation. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-12-03block: handle ENOTSUP from discard in generic codePaolo Bonzini1-6/+6
Similar to write_zeroes, let the generic code receive a ENOTSUP for discard operations. Since bdrv_discard has advisory semantics, we can just swallow the error. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Peter Lieven <pl@kamp.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-11-14block: Print its file name if backing file opening failedFam Zheng1-1/+0
If backing file doesn't exist, the error message is confusing and misleading: $ qemu /tmp/a.qcow2 qemu: could not open disk image /tmp/a.qcow2: Could not open file: No such file or directory But... $ ls /tmp/a.qcow2 /tmp/a.qcow2 $ qemu-img info /tmp/a.qcow2 image: /tmp/a.qcow2 file format: qcow2 virtual size: 8.0G (8589934592 bytes) disk size: 196K cluster_size: 65536 backing file: /tmp/b.qcow2 Because... $ ls /tmp/b.qcow2 ls: cannot access /tmp/b.qcow2: No such file or directory This is not intuitive. It's better to have the missing file's name in the error message. With this patch: $ qemu-io -c 'read 0 512' /tmp/a.qcow2 qemu-io: can't open device /tmp/a.qcow2: Could not open backing file: Could not open '/stor/vm/arch.raw': No such file or directory no file open, try 'help open' Which is a little bit better. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-11-07block/raw-posix: fix FreeBSD compilationAndreas Tobler1-1/+2
The below patch is needed to compile qemu trunk on FreeBSD with gcc48, clang will fail.... ;). Host x84_64-freebsd. Signed-off-by: Andreas Tobler <andreast@FreeBSD.org> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-10-29block: Avoid unecessary drv->bdrv_getlength() callsKevin Wolf1-3/+6
The block layer generally keeps the size of an image cached in bs->total_sectors so that it doesn't have to perform expensive operations to get the size whenever it needs it. This doesn't work however when using a backend that can change its size without qemu being aware of it, i.e. passthrough of removable media like CD-ROMs or floppy disks. For this reason, the caching is disabled when a removable device is used. It is obvious that checking whether the _guest_ device has removable media isn't the right thing to do when we want to know whether the size of the host backend can change. To make things worse, non-top-level BlockDriverStates never have any device attached, which makes qemu assume they are removable, so drv->bdrv_getlength() is always called on the protocol layer. In the case of raw-posix, this causes unnecessary lseek() system calls, which turned out to be rather expensive. This patch completely changes the logic and disables bs->total_sectors caching only for certain block driver types, for which a size change is expected: host_cdrom and host_floppy on POSIX, host_device on win32; also the raw format in case it sits on top of one of these protocols, but in the common case the nested bdrv_getlength() call on the protocol driver will use the cache again and avoid an expensive drv->bdrv_getlength() call. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2013-10-11block/raw-posix: Employ error parameterMax Reitz1-15/+57
Make use of the error parameter in the opening and creating functions in block/raw-posix.c. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-09-25block: introduce BlockDriver.bdrv_needs_filename to enable some drivers.Benoît Canet1-0/+5
Some drivers will have driver specifics options but no filename. This new bool allow the block layer to treat them correctly. The .bdrv_needs_filename is set in drivers not having .bdrv_parse_filename and not having .bdrv_open. The first exception to this rule will be the quorum driver. Signed-off-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-09-12bdrv: Use "Error" for creating imagesMax Reitz1-2/+4
Add an Error ** parameter to BlockDriver.bdrv_create to allow more specific error messages. Signed-off-by: Max Reitz <mreitz@redhat.com>
2013-09-12bdrv: Use "Error" for opening imagesMax Reitz1-4/+8
Add an Error ** parameter to BlockDriver.bdrv_open and BlockDriver.bdrv_file_open to allow more specific error messages. Signed-off-by: Max Reitz <mreitz@redhat.com>
2013-09-06raw-posix: report unwritten extents as zeroPaolo Bonzini1-0/+3
These are created for example with XFS_IOC_ZERO_RANGE. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-09-06raw-posix: return get_block_status data and flagsPaolo Bonzini1-7/+10
Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-09-06block: introduce bdrv_get_block_status APIPaolo Bonzini1-2/+2
For now, bdrv_get_block_status is just another name for bdrv_is_allocated. The next patches will add more flags. This also touches all block drivers with a mostly mechanical rename. The sole exception is cow; because it calls cow_co_is_allocated from the read code, we keep that function and make cow_co_get_block_status a wrapper. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-06-28block: change default of .has_zero_init to 0Peter Lieven1-9/+1
.has_zero_init defaults to 1 for all formats and protocols. this is a dangerous default since this means that all new added drivers need to manually overwrite it to 0 if they do not ensure that a device is zero initialized after bdrv_create(). if a driver needs to explicitly set this value to 1 its easier to verify the correctness in the review process. during review of the existing drivers it turned out that ssh and gluster had a wrong default of 1. both protocols support host_devices as backend which are not by default zero initialized. this wrong assumption will lead to possible corruption if qemu-img convert is used to write to such a backend. vpc and vmdk also defaulted to 1 altough they support fixed respectively flat extends. this has to be addresses in separate patches. both formats as well as the mentioned ssh and gluster are turned to the default of 0 with this patch for safety. a similar problem with the wrong default existed for iscsi most likely because the driver developer did oversee the default value of 1. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-06-28raw-posix: Fix /dev/cdrom magic on OS XKevin Wolf1-0/+1
The raw-posix driver has code to provide a /dev/cdrom on OS X even though it doesn't really exist. However, since commit c66a6157 the real filename is dismissed after finding it, so opening /dev/cdrom fails. Put the filename back into the options QDict to make this work again. Cc: qemu-stable@nongnu.org Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-04-22block: Remove filename parameter from .bdrv_file_open()Kevin Wolf1-10/+5
It is unused now in all block drivers. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2013-04-22raw-posix: Use bdrv_open options instead of filenameKevin Wolf1-12/+45
Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2013-03-22block: Add options QDict to bdrv_file_open() prototypesKevin Wolf1-5/+10
The new parameter is unused yet. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2013-03-15threadpool: drop global thread poolStefan Hajnoczi1-2/+6
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>
2013-02-12block/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>
2013-02-01block/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>
2013-01-19block/raw-posix: Make hdev_aio_discard() available outside LinuxAndreas Färber1-13/+13
Fixes the build on OpenBSD among others. Suggested-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Andreas Färber <andreas.faerber@web.de> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2013-01-15block: make discard asynchronousPaolo Bonzini1-80/+84
This is easy with the thread pool, because we can use s->is_xfs and s->has_discard from the worker function. QEMU has a widespread assumption that each I/O operation writes less than 2^32 bytes. This patch doesn't fix it throughout of course, but it starts correcting struct RawPosixAIOData so that there is no regression with respect to the synchronous discard implementation. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-01-15raw: support discard on block devicesPaolo Bonzini1-0/+36
Block devices use a ioctl instead of fallocate, so add a separate implementation. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-01-15raw-posix: remember whether discard failedPaolo Bonzini1-3/+6
Avoid sending system calls repeatedly if they shall fail. This does not apply to XFS: if the filesystem-specific ioctl fails, something weird is happening. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-01-15raw-posix: support discard on more filesystemsKusanagi Kouichi1-2/+24
Linux 2.6.38 introduced the filesystem independent interface to deallocate part of a file. As of Linux 3.7, btrfs, ext4, ocfs2, tmpfs and xfs support it. Even though the system calls here are in practice issued on Linux, the code is structured to allow plugging in alternatives for other Unix variants. EOPNOTSUPP is used unconditionally in this patch, but it is supported in both OpenBSD and Mac OS X since forever (see for example http://lists.debian.org/debian-glibc/2006/02/msg00337.html). Signed-off-by: Kusanagi Kouichi <slash@ac.auone-net.jp> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-01-14block: make qiov_is_aligned() publicStefan Hajnoczi1-17/+1
The qiov_is_aligned() function checks whether a QEMUIOVector meets a BlockDriverState's alignment requirements. This is needed by virtio-blk-data-plane so: 1. Move the function from block/raw-posix.c to block/block.c. 2. Make it public in block/block.h. 3. Rename to bdrv_qiov_is_aligned(). 4. Change return type from int to bool. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-01-14raw-posix: fix bdrv_aio_ioctlPaolo Bonzini1-9/+1
When the raw-posix aio=thread code was moved from posix-aio-compat.c to block/raw-posix.c, there was an unintended change to the ioctl code. The code used to return the ioctl command, which posix_aio_read() would later morph into a zero. This hack is not necessary anymore, and in fact breaks scsi-generic (which expects a zero return code). Remove it. Cc: qemu-stable@nongnu.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-01-02raw-posix: add raw_get_aio_fd() for virtio-blk-data-planeStefan Hajnoczi1-0/+34
The raw_get_aio_fd() function allows virtio-blk-data-plane to get the file descriptor of a raw image file with Linux AIO enabled. This interface is really a layering violation that can be resolved once the block layer is able to run outside the global mutex - at that point virtio-blk-data-plane will switch from custom Linux AIO code to using the block layer. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2012-12-19misc: move include files to include/qemu/Paolo Bonzini1-4/+4
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19block: move include files to include/block/Paolo Bonzini1-2/+2
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19janitor: do not include qemu-char everywherePaolo Bonzini1-1/+0
Touching char/char.h basically causes the whole of QEMU to be rebuilt. Avoid this, it is usually unnecessary. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-11raw-posix: inline paio_ioctl into hdev_aio_ioctlPaolo Bonzini1-17/+10
clang now warns about an unused function: CC block/raw-posix.o block/raw-posix.c:707:26: warning: unused function paio_ioctl [-Wunused-function] static BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd, ^ 1 warning generated. because the only use of paio_ioctl() is inside a #if defined(__linux__) guard and it is static now. Reported-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2012-11-21block: add bdrv_reopen() support for raw hdev, floppy, and cdromJeff Cody1-0/+16
For hdev, floppy, and cdrom, the reopen() handlers are the same as for the file reopen handler. For floppy and cdrom types, however, we keep O_NONBLOCK, as in the _open function. Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2012-10-31raw-posix: rename raw-posix-aio.h, hide unavailable prototypesPaolo Bonzini1-1/+1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-31raw: merge posix-aio-compat.c into block/raw-posix.cPaolo Bonzini1-0/+294
Making the qemu_paiocb specific to raw devices will let us access members of the BDRVRawState arbitrarily. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-31block: switch posix-aio-compat to threadpoolPaolo Bonzini1-10/+2
This is not meant for portability, but to remove code duplication. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-09-24block: raw-posix image file reopenJeff Cody1-0/+114
This is derived from the Supriya Kannery's reopen patches. This contains the raw-posix driver changes for the bdrv_reopen_* functions. All changes are staged into a temporary scratch buffer during the prepare() stage, and copied over to the live structure during commit(). Upon abort(), all changes are abandoned, and the live structures are unmodified. The _prepare() will create an extra fd - either by means of a dup, if possible, or opening a new fd if not (for instance, access control changes). Upon _commit(), the original fd is closed and the new fd is used. Upon _abort(), the duplicate/new fd is closed. Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-24block: purge s->aligned_buf and s->aligned_buf_size from raw-posix.cJeff Cody1-20/+1
The aligned_buf pointer and aligned_buf size are no longer used in raw_posix.c, so remove all references to them. Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-24block: use BDRV_O_NOCACHE instead of s->aligned_buf in raw-posix.cJeff Cody1-1/+1
Rather than check for a non-NULL aligned_buf to determine if raw_aio_submit needs to check for alignment, check for the presence of BDRV_O_NOCACHE in the bs->open_flags. Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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