@@ -2638,19 +2638,26 @@ static int64_t qcow2_calc_prealloc_size(int64_t total_size,
return meta_size + aligned_total_size;
}
-static size_t qcow2_opt_get_cluster_size_del(QemuOpts *opts, Error **errp)
+static bool validate_cluster_size(size_t cluster_size, Error **errp)
{
- size_t cluster_size;
- int cluster_bits;
-
- cluster_size = qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
- DEFAULT_CLUSTER_SIZE);
- cluster_bits = ctz32(cluster_size);
+ int cluster_bits = ctz32(cluster_size);
if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS ||
(1 << cluster_bits) != cluster_size)
{
error_setg(errp, "Cluster size must be a power of two between %d and "
"%dk", 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10));
+ return false;
+ }
+ return true;
+}
+
+static size_t qcow2_opt_get_cluster_size_del(QemuOpts *opts, Error **errp)
+{
+ size_t cluster_size;
+
+ cluster_size = qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
+ DEFAULT_CLUSTER_SIZE);
+ if (!validate_cluster_size(cluster_size, errp)) {
return 0;
}
return cluster_size;
@@ -2698,12 +2705,11 @@ static uint64_t qcow2_opt_get_refcount_bits_del(QemuOpts *opts, int version,
return refcount_bits;
}
-static int qcow2_create2(BlockDriverState *bs, int64_t total_size,
- const char *backing_file, const char *backing_format,
- int flags, size_t cluster_size, PreallocMode prealloc,
- QemuOpts *opts, int version, int refcount_order,
- const char *encryptfmt, Error **errp)
+static int qcow2_create2(BlockDriverState *bs,
+ BlockdevCreateOptions *create_options,
+ QemuOpts *opts, const char *encryptfmt, Error **errp)
{
+ BlockdevCreateOptionsQcow2 *qcow2_opts;
QDict *options;
/*
@@ -2720,10 +2726,92 @@ static int qcow2_create2(BlockDriverState *bs, int64_t total_size,
*/
BlockBackend *blk;
QCowHeader *header;
+ size_t cluster_size;
+ int version;
+ int refcount_order;
uint64_t* refcount_table;
Error *local_err = NULL;
int ret;
+ /* Validate options and set default values */
+ assert(create_options->driver == BLOCKDEV_DRIVER_QCOW2);
+ qcow2_opts = &create_options->u.qcow2;
+
+ if (!QEMU_IS_ALIGNED(qcow2_opts->size, BDRV_SECTOR_SIZE)) {
+ error_setg(errp, "Image size must be a multiple of 512 bytes");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (qcow2_opts->has_version) {
+ switch (qcow2_opts->version) {
+ case BLOCKDEV_QCOW2_VERSION_V2:
+ version = 2;
+ break;
+ case BLOCKDEV_QCOW2_VERSION_V3:
+ version = 3;
+ break;
+ default:
+ g_assert_not_reached();
+ }
+ } else {
+ version = 3;
+ }
+
+ if (qcow2_opts->has_cluster_size) {
+ cluster_size = qcow2_opts->cluster_size;
+ } else {
+ cluster_size = DEFAULT_CLUSTER_SIZE;
+ }
+
+ if (!validate_cluster_size(cluster_size, errp)) {
+ return -EINVAL;
+ }
+
+ if (!qcow2_opts->has_preallocation) {
+ qcow2_opts->preallocation = PREALLOC_MODE_OFF;
+ }
+ if (qcow2_opts->has_backing_file &&
+ qcow2_opts->preallocation != PREALLOC_MODE_OFF)
+ {
+ error_setg(errp, "Backing file and preallocation cannot be used at "
+ "the same time");
+ return -EINVAL;
+ }
+ if (qcow2_opts->has_backing_fmt && !qcow2_opts->has_backing_file) {
+ error_setg(errp, "Backing format cannot be used without backing file");
+ return -EINVAL;
+ }
+
+ if (!qcow2_opts->has_lazy_refcounts) {
+ qcow2_opts->lazy_refcounts = false;
+ }
+ if (version < 3 && qcow2_opts->lazy_refcounts) {
+ error_setg(errp, "Lazy refcounts only supported with compatibility "
+ "level 1.1 and above (use compat=1.1 or greater)");
+ return -EINVAL;
+ }
+
+ if (!qcow2_opts->has_refcount_bits) {
+ qcow2_opts->refcount_bits = 16;
+ }
+ if (qcow2_opts->refcount_bits > 64 ||
+ !is_power_of_2(qcow2_opts->refcount_bits))
+ {
+ error_setg(errp, "Refcount width must be a power of two and may not "
+ "exceed 64 bits");
+ return -EINVAL;
+ }
+ if (version < 3 && qcow2_opts->refcount_bits != 16) {
+ error_setg(errp, "Different refcount widths than 16 bits require "
+ "compatibility level 1.1 or above (use compat=1.1 or "
+ "greater)");
+ return -EINVAL;
+ }
+ refcount_order = ctz32(qcow2_opts->refcount_bits);
+
+
+ /* Create BlockBackend to write to the image */
blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL);
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
@@ -2750,7 +2838,7 @@ static int qcow2_create2(BlockDriverState *bs, int64_t total_size,
/* We'll update this to correct value later */
header->crypt_method = cpu_to_be32(QCOW_CRYPT_NONE);
- if (flags & BLOCK_FLAG_LAZY_REFCOUNTS) {
+ if (qcow2_opts->lazy_refcounts) {
header->compatible_features |=
cpu_to_be64(QCOW2_COMPAT_LAZY_REFCOUNTS);
}
@@ -2812,18 +2900,26 @@ static int qcow2_create2(BlockDriverState *bs, int64_t total_size,
}
/* Okay, now that we have a valid image, let's give it the right size */
- ret = blk_truncate(blk, total_size, PREALLOC_MODE_OFF, errp);
+ ret = blk_truncate(blk, qcow2_opts->size, PREALLOC_MODE_OFF, errp);
if (ret < 0) {
error_prepend(errp, "Could not resize image: ");
goto out;
}
/* Want a backing file? There you go.*/
- if (backing_file) {
- ret = bdrv_change_backing_file(blk_bs(blk), backing_file, backing_format);
+ if (qcow2_opts->has_backing_file) {
+ const char *backing_format = NULL;
+
+ if (qcow2_opts->has_backing_fmt) {
+ backing_format = BlockdevDriver_str(qcow2_opts->backing_fmt);
+ }
+
+ ret = bdrv_change_backing_file(blk_bs(blk), qcow2_opts->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);
+ "with format '%s'", qcow2_opts->backing_file,
+ backing_format);
goto out;
}
}
@@ -2837,8 +2933,8 @@ static int qcow2_create2(BlockDriverState *bs, int64_t total_size,
}
/* And if we're supposed to preallocate metadata, do that now */
- if (prealloc != PREALLOC_MODE_OFF) {
- ret = preallocate(blk_bs(blk), 0, total_size);
+ if (qcow2_opts->preallocation != PREALLOC_MODE_OFF) {
+ ret = preallocate(blk_bs(blk), 0, qcow2_opts->size);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not preallocate metadata");
goto out;
@@ -2876,8 +2972,10 @@ out:
static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
{
+ BlockdevCreateOptions create_options;
char *backing_file = NULL;
char *backing_fmt = NULL;
+ BlockdevDriver backing_drv;
char *buf = NULL;
uint64_t size = 0;
int flags = 0;
@@ -2885,7 +2983,6 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
PreallocMode prealloc;
int version;
uint64_t refcount_bits;
- int refcount_order;
char *encryptfmt = NULL;
BlockDriverState *bs = NULL;
Error *local_err = NULL;
@@ -2896,6 +2993,13 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
BDRV_SECTOR_SIZE);
backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT);
+ backing_drv = qapi_enum_parse(&BlockdevDriver_lookup, backing_fmt,
+ 0, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ ret = -EINVAL;
+ goto finish;
+ }
encryptfmt = qemu_opt_get_del(opts, BLOCK_OPT_ENCRYPT_FORMAT);
if (encryptfmt) {
if (qemu_opt_get(opts, BLOCK_OPT_ENCRYPT)) {
@@ -2933,20 +3037,6 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
flags |= BLOCK_FLAG_LAZY_REFCOUNTS;
}
- if (backing_file && prealloc != PREALLOC_MODE_OFF) {
- error_setg(errp, "Backing file and preallocation cannot be used at "
- "the same time");
- ret = -EINVAL;
- goto finish;
- }
-
- if (version < 3 && (flags & BLOCK_FLAG_LAZY_REFCOUNTS)) {
- error_setg(errp, "Lazy refcounts only supported with compatibility "
- "level 1.1 and above (use compat=1.1 or greater)");
- ret = -EINVAL;
- goto finish;
- }
-
refcount_bits = qcow2_opt_get_refcount_bits_del(opts, version, &local_err);
if (local_err) {
error_propagate(errp, local_err);
@@ -2954,10 +3044,10 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
goto finish;
}
- refcount_order = ctz32(refcount_bits);
/* Create and open the file (protocol layer) */
if (prealloc == PREALLOC_MODE_FULL || prealloc == PREALLOC_MODE_FALLOC) {
+ int refcount_order = ctz32(refcount_bits);
int64_t prealloc_size =
qcow2_calc_prealloc_size(size, cluster_size, refcount_order);
qemu_opt_set_number(opts, BLOCK_OPT_SIZE, prealloc_size, &error_abort);
@@ -2978,9 +3068,33 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
}
/* Create the qcow2 image (format layer) */
- ret = qcow2_create2(bs, size, backing_file, backing_fmt, flags,
- cluster_size, prealloc, opts, version, refcount_order,
- encryptfmt, errp);
+ create_options = (BlockdevCreateOptions) {
+ .driver = BLOCKDEV_DRIVER_QCOW2,
+ .u.qcow2 = {
+ .file = &(BlockdevRef) {
+ .type = QTYPE_QSTRING,
+ .u.reference = bs->node_name,
+ },
+ .size = size,
+ .has_version = true,
+ .version = version == 2
+ ? BLOCKDEV_QCOW2_VERSION_V2
+ : BLOCKDEV_QCOW2_VERSION_V3,
+ .has_backing_file = (backing_file != NULL),
+ .backing_file = backing_file,
+ .has_backing_fmt = (backing_fmt != NULL),
+ .backing_fmt = backing_drv,
+ .has_cluster_size = true,
+ .cluster_size = cluster_size,
+ .has_preallocation = true,
+ .preallocation = prealloc,
+ .has_lazy_refcounts = true,
+ .lazy_refcounts = (flags & BLOCK_FLAG_LAZY_REFCOUNTS),
+ .has_refcount_bits = true,
+ .refcount_bits = refcount_bits,
+ },
+ };
+ ret = qcow2_create2(bs, &create_options, opts, encryptfmt, errp);
if (ret < 0) {
goto finish;
}
All of the simple options are now passed to qcow2_create2() in a BlockdevCreateOptions object. Still missing: node-name and the encryption options. Signed-off-by: Kevin Wolf <kwolf@redhat.com> --- block/qcow2.c | 190 ++++++++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 152 insertions(+), 38 deletions(-)