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  1. 05 8月, 2011 1 次提交
  3. 10 2月, 2011 1 次提交
    • C
      QCOW2: bug fix - read base image beyond its size · e0d9c6f9
      由 Chunqiang Tang 提交于 
      This patch fixes the following bug in QCOW2. For a QCOW2 image that is larger
than its base image, when handling a read request straddling over the end of the
base image, the QCOW2 driver attempts to read beyond the end of the base image
and the request would fail.

This bug was found by Fast Virtual Disk (FVD)'s fully automated testing tool.
The following test triggered the bug.

dd if=/dev/zero of=/var/ramdisk/truth.raw count=0 bs=1 seek=1098561536
dd if=/dev/zero of=/var/ramdisk/zero-500M.raw count=0 bs=1 seek=593099264
./qemu-img create -f qcow2 -ocluster_size=65536,backing_fmt=blksim -b /var/ramdisk/zero-500M.raw /var/ramdisk/test.qcow2 1098561536
./qemu-io --auto --seed=30477694 --truth=/var/ramdisk/truth.raw --format=qcow2 --test=blksim:/var/ramdisk/test.qcow2 --verify_write=true --compare_before=false --compare_after=true --round=100000 --parallel=100 --io_size=10485760 --fail_prob=0 --cancel_prob=0 --instant_qemubh=true
Signed-off-by: NChunqiang Tang <ctang@us.ibm.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      e0d9c6f9
  5. 31 1月, 2011 4 次提交
  7. 24 1月, 2011 1 次提交
  9. 17 12月, 2010 1 次提交
  11. 04 11月, 2010 1 次提交
  13. 21 9月, 2010 1 次提交
  15. 18 3月, 2010 1 次提交
  17. 20 9月, 2009 1 次提交
  19. 11 9月, 2009 2 次提交
    • C
      block: use fdatasync instead of fsync if possible · 6f1953c4
      由 Christoph Hellwig 提交于 
      If we are flushing the caches for our image files we only care about the
data (including the metadata required for accessing it) but not things
like timestamp updates.  So try to use fdatasync instead of fsync to
implement the flush operations.

Unfortunately many operating systems still do not support fdatasync,
so we add a qemu_fdatasync wrapper that uses fdatasync if available
as per the _POSIX_SYNCHRONIZED_IO feature macro or fsync otherwise.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      6f1953c4
    • K
      Add bdrv_aio_multiwrite · 40b4f539
      由 Kevin Wolf 提交于 
      One performance problem of qcow2 during the initial image growth are
sequential writes that are not cluster aligned. In this case, when a first
requests requires to allocate a new cluster but writes only to the first
couple of sectors in that cluster, the rest of the cluster is zeroed - just
to be overwritten by the following second request that fills up the cluster.

Let's try to merge sequential write requests to the same cluster, so we can
avoid to write the zero padding to the disk in the first place.

As a nice side effect, also other formats take advantage of dealing with less
and larger requests.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      40b4f539
  21. 10 7月, 2009 1 次提交
  23. 02 7月, 2009 1 次提交
  25. 30 6月, 2009 1 次提交
    • 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
  27. 14 5月, 2009 1 次提交
  29. 29 3月, 2009 1 次提交
  31. 06 2月, 2009 1 次提交
  33. 27 1月, 2009 1 次提交
  35. 23 1月, 2009 1 次提交
  37. 12 12月, 2008 1 次提交
  39. 05 12月, 2008 2 次提交
  41. 16 11月, 2008 1 次提交
  43. 09 11月, 2008 1 次提交
  45. 25 10月, 2008 1 次提交
  47. 09 6月, 2008 1 次提交
  49. 12 4月, 2008 1 次提交
  51. 11 11月, 2007 2 次提交
  53. 17 9月, 2007 1 次提交
  55. 08 1月, 2007 1 次提交