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qcow2: Use BB functions in .bdrv_create()

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All users of the block layers are supposed to go through a BlockBackend.
The .bdrv_create() implementation is one such user, so this patch
converts it.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2016-03-08 15:57:05 +01:00
parent 6af4016020
commit 23588797b6
1 changed files with 33 additions and 29 deletions
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62
block/qcow2.c
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@ -24,6 +24,7 @@
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "block/block_int.h"
#include "sysemu/block-backend.h"
#include "qemu/module.h"
#include <zlib.h>
#include "block/qcow2.h"
@ -2097,7 +2098,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
* 2 GB for 64k clusters, and we don't want to have a 2 GB initial file
* size for any qcow2 image.
*/
BlockDriverState* bs;
BlockBackend *blk;
QCowHeader *header;
uint64_t* refcount_table;
Error *local_err = NULL;
@ -2172,15 +2173,16 @@ static int qcow2_create2(const char *filename, int64_t total_size,
return ret;
}
bs = NULL;
ret = bdrv_open(&bs, filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_PROTOCOL,
&local_err);
if (ret < 0) {
blk = blk_new_open("image", filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_PROTOCOL,
&local_err);
if (blk == NULL) {
error_propagate(errp, local_err);
return ret;
return -EIO;
}
blk_set_allow_write_beyond_eof(blk, true);
/* Write the header */
QEMU_BUILD_BUG_ON((1 << MIN_CLUSTER_BITS) < sizeof(*header));
header = g_malloc0(cluster_size);
@ -2208,7 +2210,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
cpu_to_be64(QCOW2_COMPAT_LAZY_REFCOUNTS);
}
ret = bdrv_pwrite(bs, 0, header, cluster_size);
ret = blk_pwrite(blk, 0, header, cluster_size);
g_free(header);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not write qcow2 header");
@ -2218,7 +2220,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
/* Write a refcount table with one refcount block */
refcount_table = g_malloc0(2 * cluster_size);
refcount_table[0] = cpu_to_be64(2 * cluster_size);
ret = bdrv_pwrite(bs, cluster_size, refcount_table, 2 * cluster_size);
ret = blk_pwrite(blk, cluster_size, refcount_table, 2 * cluster_size);
g_free(refcount_table);
if (ret < 0) {
@ -2226,8 +2228,8 @@ static int qcow2_create2(const char *filename, int64_t total_size,
goto out;
}
bdrv_unref(bs);
bs = NULL;
blk_unref(blk);
blk = NULL;
/*
* And now open the image and make it consistent first (i.e. increase the
@ -2236,15 +2238,16 @@ static int qcow2_create2(const char *filename, int64_t total_size,
*/
options = qdict_new();
qdict_put(options, "driver", qstring_from_str("qcow2"));
ret = bdrv_open(&bs, filename, NULL, options,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH,
&local_err);
if (ret < 0) {
blk = blk_new_open("image-qcow2", filename, NULL, options,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH,
&local_err);
if (blk == NULL) {
error_propagate(errp, local_err);
ret = -EIO;
goto out;
}
ret = qcow2_alloc_clusters(bs, 3 * cluster_size);
ret = qcow2_alloc_clusters(blk_bs(blk), 3 * cluster_size);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not allocate clusters for qcow2 "
"header and refcount table");
@ -2256,14 +2259,14 @@ static int qcow2_create2(const char *filename, int64_t total_size,
}
/* Create a full header (including things like feature table) */
ret = qcow2_update_header(bs);
ret = qcow2_update_header(blk_bs(blk));
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not update qcow2 header");
goto out;
}
/* Okay, now that we have a valid image, let's give it the right size */
ret = bdrv_truncate(bs, total_size);
ret = blk_truncate(blk, total_size);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not resize image");
goto out;
@ -2271,7 +2274,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
/* Want a backing file? There you go.*/
if (backing_file) {
ret = bdrv_change_backing_file(bs, backing_file, backing_format);
ret = bdrv_change_backing_file(blk_bs(blk), backing_file, backing_format);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not assign backing file '%s' "
"with format '%s'", backing_file, backing_format);
@ -2281,9 +2284,9 @@ static int qcow2_create2(const char *filename, int64_t total_size,
/* And if we're supposed to preallocate metadata, do that now */
if (prealloc != PREALLOC_MODE_OFF) {
BDRVQcow2State *s = bs->opaque;
BDRVQcow2State *s = blk_bs(blk)->opaque;
qemu_co_mutex_lock(&s->lock);
ret = preallocate(bs);
ret = preallocate(blk_bs(blk));
qemu_co_mutex_unlock(&s->lock);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not preallocate metadata");
@ -2291,24 +2294,25 @@ static int qcow2_create2(const char *filename, int64_t total_size,
}
}
bdrv_unref(bs);
bs = NULL;
blk_unref(blk);
blk = NULL;
/* Reopen the image without BDRV_O_NO_FLUSH to flush it before returning */
options = qdict_new();
qdict_put(options, "driver", qstring_from_str("qcow2"));
ret = bdrv_open(&bs, filename, NULL, options,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_BACKING,
&local_err);
if (local_err) {
blk = blk_new_open("image-flush", filename, NULL, options,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_BACKING,
&local_err);
if (blk == NULL) {
error_propagate(errp, local_err);
ret = -EIO;
goto out;
}
ret = 0;
out:
if (bs) {
bdrv_unref(bs);
if (blk) {
blk_unref(blk);
}
return ret;
}