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block: Factor bdrv_probe_all() out of find_image_format()

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Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 1416497234-29880-6-git-send-email-kwolf@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Markus Armbruster 2014-11-20 16:27:10 +01:00 committed by Kevin Wolf
parent b8e665e4d8
commit c6684249fd
1 changed files with 35 additions and 13 deletions
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48
block.c
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@ -648,11 +648,43 @@ BlockDriver *bdrv_find_protocol(const char *filename,
return NULL; return NULL;
} }
/*
* Guess image format by probing its contents.
* This is not a good idea when your image is raw (CVE-2008-2004), but
* we do it anyway for backward compatibility.
*
* @buf contains the image's first @buf_size bytes.
* @buf_size is the buffer size in bytes (generally 2048, but can be smaller
* if the image file is smaller)
* @filename is its filename.
*
* For all block drivers, call the bdrv_probe() method to get its
* probing score.
* Return the first block driver with the highest probing score.
*/
static BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size,
const char *filename)
{
int score_max = 0, score;
BlockDriver *drv = NULL, *d;
QLIST_FOREACH(d, &bdrv_drivers, list) {
if (d->bdrv_probe) {
score = d->bdrv_probe(buf, buf_size, filename);
if (score > score_max) {
score_max = score;
drv = d;
}
}
}
return drv;
}
static int find_image_format(BlockDriverState *bs, const char *filename, static int find_image_format(BlockDriverState *bs, const char *filename,
BlockDriver **pdrv, Error **errp) BlockDriver **pdrv, Error **errp)
{ {
int score, score_max; BlockDriver *drv;
BlockDriver *drv1, *drv;
uint8_t buf[2048]; uint8_t buf[2048];
int ret = 0; int ret = 0;
@ -675,17 +707,7 @@ static int find_image_format(BlockDriverState *bs, const char *filename,
return ret; return ret;
} }
score_max = 0; drv = bdrv_probe_all(buf, ret, filename);
drv = NULL;
QLIST_FOREACH(drv1, &bdrv_drivers, list) {
if (drv1->bdrv_probe) {
score = drv1->bdrv_probe(buf, ret, filename);
if (score > score_max) {
score_max = score;
drv = drv1;
}
}
}
if (!drv) { if (!drv) {
error_setg(errp, "Could not determine image format: No compatible " error_setg(errp, "Could not determine image format: No compatible "
"driver found"); "driver found");