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block: fix BDRV_O_SNAPSHOT protocol detection 

realpath(3) is used to get an absolute path to the image file when
creating a -drive snapshot=on temporary qcow2.  This does not work for
protocols since their filenames ("proto:foo:...") do not correspond to
file system paths.

Commit 7c96d46ec2 ("Let snapshot work with
protocols") skipped realpath(3) for protocols.  Later on the "raw"
format was introduced and broke the check.

Use path_has_protocol(filename) to decide if this image uses a protocol
or a filename.

Reported-by: Richard Jones <rjones@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2013-03-18 17:58:53 +01:00 committed by Kevin Wolf
parent acdfb480ba
commit 4d70655bcb
1 changed files with 1 additions and 5 deletions
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6
block.c
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@ -830,7 +830,6 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
if (flags & BDRV_O_SNAPSHOT) {
BlockDriverState *bs1;
int64_t total_size;
int is_protocol = 0;
BlockDriver *bdrv_qcow2;
QEMUOptionParameter *options;
char backing_filename[PATH_MAX];
@ -847,9 +846,6 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
}
total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
if (bs1->drv && bs1->drv->protocol_name)
is_protocol = 1;
bdrv_delete(bs1);
ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename));
@ -858,7 +854,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
}
/* Real path is meaningless for protocols */
if (is_protocol) {
if (path_has_protocol(filename)) {
snprintf(backing_filename, sizeof(backing_filename),
"%s", filename);
} else if (!realpath(filename, backing_filename)) {