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Let snapshot work with protocols

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realpath will horribly mangle a protocol so avoid calling it if the backing
file is a protocol.



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5200 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-09-12 17:54:13 +00:00
parent a145ea5120
commit 7c96d46ec2
1 changed files with 13 additions and 1 deletions
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14
block.c
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@ -338,6 +338,7 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
if (flags & BDRV_O_SNAPSHOT) { if (flags & BDRV_O_SNAPSHOT) {
BlockDriverState *bs1; BlockDriverState *bs1;
int64_t total_size; int64_t total_size;
int is_protocol = 0;
/* if snapshot, we create a temporary backing file and open it /* if snapshot, we create a temporary backing file and open it
instead of opening 'filename' directly */ instead of opening 'filename' directly */
@ -352,10 +353,21 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
return -1; return -1;
} }
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
if (bs1->drv && bs1->drv->protocol_name)
is_protocol = 1;
bdrv_delete(bs1); bdrv_delete(bs1);
get_tmp_filename(tmp_filename, sizeof(tmp_filename)); get_tmp_filename(tmp_filename, sizeof(tmp_filename));
realpath(filename, backing_filename);
/* Real path is meaningless for protocols */
if (is_protocol)
snprintf(backing_filename, sizeof(backing_filename),
"%s", filename);
else
realpath(filename, backing_filename);
if (bdrv_create(&bdrv_qcow2, tmp_filename, if (bdrv_create(&bdrv_qcow2, tmp_filename,
total_size, backing_filename, 0) < 0) { total_size, backing_filename, 0) < 0) {
return -1; return -1;