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block: Set BDRV_O_ALLOW_RDWR and snapshot_options before storing the flags

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If an image is opened with snapshot=on, its flags are modified by
bdrv_backing_options() and then bs->open_flags is updated accordingly.
This last step is unnecessary if we calculate the new flags before
setting bs->open_flags.

Soon we'll introduce the "read-only" option, and then we'll need to
be able to modify its value in the QDict when snapshot=on. This is
more cumbersome if bs->options is already set. This patch simplifies
that. Other than that, there are no semantic changes. Although it
might seem that bs->options can have a different value now because
it is stored after calling bdrv_backing_options(), this call doesn't
actually modify them in this scenario.

The code that sets BDRV_O_ALLOW_RDWR is also moved for the same
reason.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2016-09-15 17:53:00 +03:00 committed by Kevin Wolf
parent 38b5e4c3dc
commit 14499ea541
1 changed files with 11 additions and 12 deletions
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23
block.c
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@ -1675,6 +1675,17 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
goto fail;
}
if (flags & BDRV_O_RDWR) {
flags |= BDRV_O_ALLOW_RDWR;
}
if (flags & BDRV_O_SNAPSHOT) {
snapshot_options = qdict_new();
bdrv_temp_snapshot_options(&snapshot_flags, snapshot_options,
flags, options);
bdrv_backing_options(&flags, options, flags, options);
}
bs->open_flags = flags;
bs->options = options;
options = qdict_clone_shallow(options);
@ -1699,18 +1710,6 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
/* Open image file without format layer */
if ((flags & BDRV_O_PROTOCOL) == 0) {
if (flags & BDRV_O_RDWR) {
flags |= BDRV_O_ALLOW_RDWR;
}
if (flags & BDRV_O_SNAPSHOT) {
snapshot_options = qdict_new();
bdrv_temp_snapshot_options(&snapshot_flags, snapshot_options,
flags, options);
bdrv_backing_options(&flags, options, flags, options);
}
bs->open_flags = flags;
file = bdrv_open_child(filename, options, "file", bs,
&child_file, true, &local_err);
if (local_err) {