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block: Omit bdrv_find_format for essential drivers 

We can always assume raw, file and qcow2 being available; so do not use
bdrv_find_format() to locate their BlockDriver objects but statically
reference the respective objects.

Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2014-12-02 18:32:42 +01:00 committed by Kevin Wolf
parent 5f535a941e
commit ef8104378c
2 changed files with 8 additions and 16 deletions
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17
block.c
View File

@ -629,7 +629,7 @@ BlockDriver *bdrv_find_protocol(const char *filename,
}
if (!path_has_protocol(filename) || !allow_protocol_prefix) {
return bdrv_find_format("file");
return &bdrv_file;
}
p = strchr(filename, ':');
@ -690,12 +690,7 @@ static int find_image_format(BlockDriverState *bs, const char *filename,
/* Return the raw BlockDriver * to scsi-generic devices or empty drives */
if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) {
drv = bdrv_find_format("raw");
if (!drv) {
error_setg(errp, "Could not find raw image format");
ret = -ENOENT;
}
*pdrv = drv;
*pdrv = &bdrv_raw;
return ret;
}
@ -1315,7 +1310,6 @@ int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp)
/* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */
char *tmp_filename = g_malloc0(PATH_MAX + 1);
int64_t total_size;
BlockDriver *bdrv_qcow2;
QemuOpts *opts = NULL;
QDict *snapshot_options;
BlockDriverState *bs_snapshot;
@ -1340,11 +1334,10 @@ int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp)
goto out;
}
bdrv_qcow2 = bdrv_find_format("qcow2");
opts = qemu_opts_create(bdrv_qcow2->create_opts, NULL, 0,
opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0,
&error_abort);
qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size);
ret = bdrv_create(bdrv_qcow2, tmp_filename, opts, &local_err);
ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, &local_err);
qemu_opts_del(opts);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not create temporary overlay "
@ -1364,7 +1357,7 @@ int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp)
bs_snapshot = bdrv_new();
ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options,
flags, bdrv_qcow2, &local_err);
flags, &bdrv_qcow2, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
goto out;

7
block/qcow2.c
View File

@ -1915,10 +1915,9 @@ static int qcow2_create2(const char *filename, int64_t total_size,
* refcount of the cluster that is occupied by the header and the refcount
* table)
*/
BlockDriver* drv = bdrv_find_format("qcow2");
assert(drv != NULL);
ret = bdrv_open(&bs, filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv, &local_err);
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH,
&bdrv_qcow2, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
goto out;
@ -1970,7 +1969,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
/* Reopen the image without BDRV_O_NO_FLUSH to flush it before returning */
ret = bdrv_open(&bs, filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_BACKING,
drv, &local_err);
&bdrv_qcow2, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;