The reference count table must be continuous in the file, not
preallocating it when creating a file causes errors when setting
reference counts for new blocks later.
BUG=809847
TEST=Replay formatting and downloading container events.
Add unit test that catches error with default files.
Change-Id: I08840958a1180a73f32f42d520517bcf88a158b0
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/909915
Check the correct offset for divided writes. This was causing failures
with btrfs.
Add a unit test that checks for errors like this.
Change-Id: Ic29e6f02edf42aea19c4cbced2994c2259baf823
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/894469
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Stephen Barber <smbarber@chromium.org>
For creating qcow files there needs to be the ability to save headers to
disk so they can be opened later.
Change-Id: Icf0134dd5ad3910c09f6e3766aca17ee003956c0
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/875115
Reviewed-by: Stephen Barber <smbarber@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
Allow an empty QcowHeader to be created. Later, this allows QcowFiles to
be created in addition to opened.
Change-Id: Ifcc2f8ed2a92054fb7b60999d401fb573e98aa73
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/875114
Reviewed-by: Stephen Barber <smbarber@chromium.org>
QCOW2 files will be used to store the VM's data on ChromeOS. Add
support for basic reading and writing of qcow files.
CQ-DEPEND=CL:872451
BUG=none
TEST=qcow unit tests and use "qemu-image check" to verify generated qcow
files.
Change-Id: I4b9e77e58edca69f894ede19e79ebd2cd7b2623e
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/862628
Reviewed-by: Stephen Barber <smbarber@chromium.org>
