diff options
| author | Thibaut LAURENT <thibaut.laurent@gmail.com> | 2013-10-25 02:15:07 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2013-10-29 13:06:39 +0100 |
| commit | 87a5debd3161d24a7d4c685e3c0d8765b5d92a74 (patch) | |
| tree | 4a0bc68d63a6678a030b1755a8a9a6fa4cbfe299 /block.c | |
| parent | 8464b273d69c61e33c55347e5b6bc0659687bae2 (diff) | |
block: Disable BDRV_O_COPY_ON_READ for the backing file
Since commit 0ebd24e0a203cf2852c310b59fbe050190dc6c8c,
bdrv_open_common will throw an error when trying to open a file
read-only with the BDRV_O_COPY_ON_READ flag set.
Although BDRV_O_RDWR is unset for the backing files,
BDRV_O_COPY_ON_READ is still passed on if copy-on-read was requested
for the drive. Let's unset this flag too before opening the backing
file, or bdrv_open_common will fail.
Signed-off-by: Thibaut LAURENT <thibaut.laurent@gmail.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 3 |
1 files changed, 2 insertions, 1 deletions
@@ -999,7 +999,8 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) } /* backing files always opened read-only */ - back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT); + back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | + BDRV_O_COPY_ON_READ); ret = bdrv_open(bs->backing_hd, *backing_filename ? backing_filename : NULL, options, |