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sheepdog: Mark sd_snapshot_delete() lossage FIXME

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sd_snapshot_delete() should delete the snapshot whose ID matches
@snapshot_id and whose name matches @name.  But that's not what it
does.  If @snapshot_id is a valid ID, it deletes the snapshot with
that ID, else it deletes the snapshot with that name.  It doesn't use
@name at all.  Add suitable FIXME comments, so someone who actually
knows Sheepdog can fix it.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Markus Armbruster 2017-03-06 20:00:38 +01:00 committed by Kevin Wolf
parent 48d7c4af06
commit a0dc0e2bfe
1 changed files with 10 additions and 0 deletions
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10
block/sheepdog.c
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@ -2457,6 +2457,10 @@ static int sd_snapshot_delete(BlockDriverState *bs,
const char *name,
Error **errp)
{
/*
* FIXME should delete the snapshot matching both @snapshot_id and
* @name, but @name not used here
*/
unsigned long snap_id = 0;
char snap_tag[SD_MAX_VDI_TAG_LEN];
int fd, ret;
@ -2481,6 +2485,11 @@ static int sd_snapshot_delete(BlockDriverState *bs,
pstrcpy(buf, SD_MAX_VDI_LEN, s->name);
ret = qemu_strtoul(snapshot_id, NULL, 10, &snap_id);
if (ret || snap_id > UINT32_MAX) {
/*
* FIXME Since qemu_strtoul() returns -EINVAL when
* @snapshot_id is null, @snapshot_id is mandatory. Correct
* would be to require at least one of @snapshot_id and @name.
*/
error_setg(errp, "Invalid snapshot ID: %s",
snapshot_id ? snapshot_id : "<null>");
return -EINVAL;
@ -2489,6 +2498,7 @@ static int sd_snapshot_delete(BlockDriverState *bs,
if (snap_id) {
hdr.snapid = (uint32_t) snap_id;
} else {
/* FIXME I suspect we should use @name here */
pstrcpy(snap_tag, sizeof(snap_tag), snapshot_id);
pstrcpy(buf + SD_MAX_VDI_LEN, SD_MAX_VDI_TAG_LEN, snap_tag);
}