Skip to content

Q
qemu

openeuler / qemu

通知 10
Star 0
Fork 0
Q
qemu
切换分支/标签
  1. 21 7月, 2009 1 次提交
  3. 17 7月, 2009 1 次提交
  5. 10 7月, 2009 2 次提交
  7. 30 6月, 2009 2 次提交
    • K
      block-raw: Allow pread beyond the end of growable images · 22afa7b5
      由 Kevin Wolf 提交于 
      When using O_DIRECT, qcow2 snapshots didn't work any more for me. In the
process of creating the snapshot, qcow2 tries to pwrite some new information
(e.g. new L1 table) which will often end up being after the old end of the
image file. Now pwrite tries to align things and reads the old contents of the
file, read returns 0 because there is nothing to read after the end of file and
pwrite is stuck in an endless loop.

This patch allows to pread beyond the end of an image file. Whenever the
given offset is after the end of the image file, the read succeeds and fills
the buffer with zeros.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      22afa7b5
    • R
      support colon in filenames · 707c0dbc
      由 Ram Pai 提交于 
      Problem: It is impossible to feed filenames with the character colon because
qemu interprets such names as a protocol. For example filename scsi:0, is
interpreted as a protocol by name "scsi".

This patch allows user to espace colon characters. For example the above
filename can now be expressed either as 'scsi\:0' or as file:scsi:0

anything following the "file:" tag is interpreted verbatin. However if "file:"
tag is omitted then any colon characters in the string must be escaped using
backslash.

Here are couple of examples:

scsi\:0\:abc is a local file scsi:0:abc
http\://myweb is a local file by name http://myweb
file:scsi:0:abc is a local file scsi:0:abc
file:http://myweb is a local file by name http://mywebSigned-off-by: NRam Pai <linuxram@us.ibm.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      707c0dbc
  9. 17 6月, 2009 3 次提交
  11. 15 6月, 2009 5 次提交
    • C
      raw-posix: cleanup ioctl methods · 63ec93db
      由 Christoph Hellwig 提交于 
      Rename raw_ioctl and raw_aio_ioctl to hdev_ioctl and hdev_aio_ioctl as they
are only used for the host device.  Also only add them to the method table
for the cases where we need them (generic hdev if linux and linux CDROM)
instead of declaring stubs and always add them.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
      63ec93db
    • C
      block: add bdrv_probe_device method · 508c7cb3
      由 Christoph Hellwig 提交于 
      Add a bdrv_probe_device method to all BlockDriver instances implementing
host devices to move matching of host device types into the actual drivers.
For now we keep exacly the old matching behaviour based on the devices names,
although we really should have better detetion methods based on device
information in the future.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
      508c7cb3
    • C
      raw-posix: split hdev drivers · f3a5d3f8
      由 Christoph Hellwig 提交于 
      Instead of declaring one BlockDriver for all host devices declared one
for each type:  a generic one for normal disk devices, a Linux floppy
driver and a CDROM driver for Linux and FreeBSD.  This gets rid of a lot
of messy ifdefs and switching based on the type in the various removal
device methods.

block.c grows a new method to find the correct host device driver based
on OS-sepcific criteria, which will later into the actual drivers in a
later patch in this series.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
      f3a5d3f8
    • C
      raw-posix: add a raw_open_common helper · 90babde0
      由 Christoph Hellwig 提交于 
      raw_open and hdev_open contain the same basic logic.  Add a new
raw_open_common helper containing the guts of the open routine
and call it from raw_open and hdev_open.

We use the new open_flags field in BDRVRawState to allow passing
additional open flags to raw_open_common from both.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
      90babde0
    • C
      raw-posix: always store open flags · 0e1d8f4c
      由 Christoph Hellwig 提交于 
      Both the Linux floppy and the FreeBSD CDROM host device need to store
the open flags so that they can re-open the device later.  Store the
open flags unconditionally to remove the ifdef mess and simply the
calling conventions for the later patches in the series.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
      0e1d8f4c
  13. 06 6月, 2009 1 次提交
  15. 27 5月, 2009 3 次提交
    • C
      fully split aio_pool from BlockDriver · c16b5a2c
      由 Christoph Hellwig 提交于 
      Now that we have a separate aio pool structure we can remove those
aio pool details from BlockDriver.

Every driver supporting AIO now needs to declare a static AIOPool
with the aiocb size and the cancellation method.  This cleans up the
current code considerably and will make it cleaner and more obvious
to support two different aio implementations behind a single
BlockDriver.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      c16b5a2c
    • C
      raw-posix: fix hdev_create · 4099df58
      由 Christoph Hellwig 提交于 
      We do need hdev_create unconditionally on all platforms so that qemu-img
create support for host device works on all platforms.

Also relax the check to allow character devices in addition to block
devices.  On many Unix platforms block devices have buffered block
nodes and unbuffered character device nodes, and on FreeBSD the block
nodes don't even exist anymore.  Also on Linux we do support the
/dev/sgN scsi passthrough devices through the host device driver,
and probably the old-style /dev/raw/rawN raw devices although I haven't
tested that.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      4099df58
    • C
      fix raw_pread_aligned return value · 94c6d6d8
      由 Christoph Hellwig 提交于 
      raw_pread_aligned currently returns the raw return value from
lseek/read, which is always -1 in case of an error.  But the
callers higher up the stack expect it to return the negated
errno just like raw_pwrite_aligned.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      94c6d6d8
  17. 22 5月, 2009 1 次提交
  19. 15 5月, 2009 2 次提交
  21. 14 5月, 2009 2 次提交
  23. 23 4月, 2009 1 次提交
    • A
      implement qemu_blockalign (Stefano Stabellini) · e268ca52
      由 aliguori 提交于 
      this patch adds a buffer_alignment field to BlockDriverState and
implements a qemu_blockalign function that uses that field to allocate a
memory aligned buffer to be used by the block driver.
buffer_alignment is initialized to 512 but each block driver can set
a different value (at the moment none of them do).
This patch modifies ide.c, block-qcow.c, block-qcow2.c and block.c to
use qemu_blockalign instead of qemu_memalign.
There is only one place left that still uses qemu_memalign to allocate
buffers used by block drivers that is posix-aio-compat:handle_aiocb_rw
because it is not possible to get the BlockDriverState from that
function. However I think it is not important because posix-aio-compat
already deals with driver specific code so it is supposed to know its
own needs.
Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7229 c046a42c-6fe2-441c-8c8c-71466251a162
      e268ca52
  25. 08 4月, 2009 2 次提交
  27. 06 4月, 2009 2 次提交
    • A
      Fix the build for --disable-aio · 8185d2c9
      由 aliguori 提交于 
      This was reported by malc.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6993 c046a42c-6fe2-441c-8c8c-71466251a162
      8185d2c9
    • A
      Add host_device support to qemu-img. (Nolan Leake) · 93c65b47
      由 aliguori 提交于 
      This patch allows the use a host_device as the destination for "qemu-img
convert".

I added a ->bdrv_create function host_device.  It merely verifies that
the device exists and is large enough.

A check is needed in the qemu-img convert loop to ensure that we write
out all 0 sectors to the host_device.  Otherwise they end up with stale
garbage where all zero sectors were expected.

I also made the check against bdrv_is_allocated enabled for everything
_except_ host devices, since there is no point in making the block
backend write a bunch of zeros just so that we can memcmp them
immediately afterwards.  Host devices can't benefit from this because
there is no way to differentiate between a sector being unallocated
because it was never written, or because it was written with all zeros
and then made a trip through qemu-img convert.

Finally, there is an unrelated fix for a typo in the error message
printed if the destination device does not support ->bdrv_create.

Signed-off-by: Nolan Leake <nolan <at> sigbus.net>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6978 c046a42c-6fe2-441c-8c8c-71466251a162
      93c65b47
  29. 31 3月, 2009 1 次提交
  31. 29 3月, 2009 1 次提交
    • A
      new scsi-generic abstraction, use SG_IO (Christoph Hellwig) · 221f715d
      由 aliguori 提交于 
      Okay, I started looking into how to handle scsi-generic I/O in the
new world order.

I think the best is to use the SG_IO ioctl instead of the read/write
interface as that allows us to support scsi passthrough on disk/cdrom
devices, too.  See Hannes patch on the kvm list from August for an
example.

Now that we always do ioctls we don't need another abstraction than
bdrv_ioctl for the synchronous requests for now, and for asynchronous
requests I've added a aio_ioctl abstraction keeping it simple.

Long-term we might want to move the ops to a higher-level abstraction
and let the low-level code fill out the request header, but I'm lazy
enough to leave that to the people trying to support scsi-passthrough
on a non-Linux OS.

Tested lightly by issuing various sg_ commands from sg3-utils in a guest
to a host CDROM device.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6895 c046a42c-6fe2-441c-8c8c-71466251a162
      221f715d
  33. 28 3月, 2009 1 次提交
    • B
      FreeBSD host physical cdrom fixes · 9f23011a
      由 blueswir1 提交于 
      This improves physical cdrom support on FreeBSD hosts to be almost as
good as on Linux, with the only notable exception that you still need to
either have the guest itself eject the disc if you want to take it
out/change it, or do a change command in the monitor after taking out
a disc in case a guest cannot eject it itself - otherwise the guest may
continue using state (like size) of the old disc.
Signed-off-by: NJuergen Lock <nox@jelal.kn-bremen.de>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6888 c046a42c-6fe2-441c-8c8c-71466251a162
      9f23011a
  35. 13 3月, 2009 3 次提交
  37. 08 3月, 2009 3 次提交
  39. 27 2月, 2009 1 次提交
  41. 06 2月, 2009 1 次提交
  43. 30 1月, 2009 1 次提交