diff options
| author | Jeff Cody | 2014-06-25 21:40:10 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi | 2014-07-01 10:47:01 +0200 |
| commit | 54e269009099cdc9483be115f1e12d56ad459c5e (patch) | |
| tree | a7504876994f5abe0e628e5668848594b338fa98 /include | |
| parent | block: add helper function to determine if a BDS is in a chain (diff) | |
| download | qemu-54e269009099cdc9483be115f1e12d56ad459c5e.tar.gz qemu-54e269009099cdc9483be115f1e12d56ad459c5e.tar.xz qemu-54e269009099cdc9483be115f1e12d56ad459c5e.zip | |
block: extend block-commit to accept a string for the backing file
On some image chains, QEMU may not always be able to resolve the
filenames properly, when updating the backing file of an image
after a block commit.
For instance, certain relative pathnames may fail, or drives may
have been specified originally by file descriptor (e.g. /dev/fd/???),
or a relative protocol pathname may have been used.
In these instances, QEMU may lack the information to be able to make
the correct choice, but the user or management layer most likely does
have that knowledge.
With this extension to the block-commit api, the user is able to change
the backing file of the overlay image as part of the block-commit
operation.
This allows the change to be 'safe', in the sense that if the attempt
to write the overlay image metadata fails, then the block-commit
operation returns failure, without disrupting the guest.
If the commit top is the active layer, then specifying the backing
file string will be treated as an error (there is no overlay image
to modify in that case).
If a backing file string is not specified in the command, the backing
file string to use is determined in the same manner as it was
previously.
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/block/block.h | 3 | ||||
| -rw-r--r-- | include/block/block_int.h | 3 |
2 files changed, 4 insertions, 2 deletions
diff --git a/include/block/block.h b/include/block/block.h index 29c9e50ddb..baecc26dfc 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -285,7 +285,8 @@ int bdrv_change_backing_file(BlockDriverState *bs, const char *backing_file, const char *backing_fmt); void bdrv_register(BlockDriver *bdrv); int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, - BlockDriverState *base); + BlockDriverState *base, + const char *backing_file_str); BlockDriverState *bdrv_find_overlay(BlockDriverState *active, BlockDriverState *bs); BlockDriverState *bdrv_find_base(BlockDriverState *bs); diff --git a/include/block/block_int.h b/include/block/block_int.h index eaf6e313d5..8f8e65e763 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -463,13 +463,14 @@ void stream_start(BlockDriverState *bs, BlockDriverState *base, * @on_error: The action to take upon error. * @cb: Completion function for the job. * @opaque: Opaque pointer value passed to @cb. + * @backing_file_str: String to use as the backing file in @top's overlay * @errp: Error object. * */ void commit_start(BlockDriverState *bs, BlockDriverState *base, BlockDriverState *top, int64_t speed, BlockdevOnError on_error, BlockDriverCompletionFunc *cb, - void *opaque, Error **errp); + void *opaque, const char *backing_file_str, Error **errp); /** * commit_active_start: * @bs: Active block device to be committed. |