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qcow2: extract image creation option parsing 

The image creation options parsed by qcow2_create() are also needed to
implement .bdrv_measure().  Extract the parsing code, including input
validation.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-id: 20170705125738.8777-6-stefanha@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2017-07-05 13:57:34 +01:00 committed by Max Reitz
parent 7c5bcc4212
commit 0eb4a8c1df
1 changed files with 73 additions and 36 deletions
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109
block/qcow2.c
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@ -2612,24 +2612,73 @@ static int64_t qcow2_calc_prealloc_size(int64_t total_size,
return meta_size + aligned_total_size;
}
static int qcow2_create2(const char *filename, 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 size_t qcow2_opt_get_cluster_size_del(QemuOpts *opts, Error **errp)
{
size_t cluster_size;
int cluster_bits;
QDict *options;
/* Calculate cluster_bits */
cluster_size = qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
DEFAULT_CLUSTER_SIZE);
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 -EINVAL;
return 0;
}
return cluster_size;
}
static int qcow2_opt_get_version_del(QemuOpts *opts, Error **errp)
{
char *buf;
int ret;
buf = qemu_opt_get_del(opts, BLOCK_OPT_COMPAT_LEVEL);
if (!buf) {
ret = 3; /* default */
} else if (!strcmp(buf, "0.10")) {
ret = 2;
} else if (!strcmp(buf, "1.1")) {
ret = 3;
} else {
error_setg(errp, "Invalid compatibility level: '%s'", buf);
ret = -EINVAL;
}
g_free(buf);
return ret;
}
static uint64_t qcow2_opt_get_refcount_bits_del(QemuOpts *opts, int version,
Error **errp)
{
uint64_t refcount_bits;
refcount_bits = qemu_opt_get_number_del(opts, BLOCK_OPT_REFCOUNT_BITS, 16);
if (refcount_bits > 64 || !is_power_of_2(refcount_bits)) {
error_setg(errp, "Refcount width must be a power of two and may not "
"exceed 64 bits");
return 0;
}
if (version < 3 && 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 0;
}
return refcount_bits;
}
static int qcow2_create2(const char *filename, 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)
{
QDict *options;
/*
* Open the image file and write a minimal qcow2 header.
@ -2679,7 +2728,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
*header = (QCowHeader) {
.magic = cpu_to_be32(QCOW_MAGIC),
.version = cpu_to_be32(version),
.cluster_bits = cpu_to_be32(cluster_bits),
.cluster_bits = cpu_to_be32(ctz32(cluster_size)),
.size = cpu_to_be64(0),
.l1_table_offset = cpu_to_be64(0),
.l1_size = cpu_to_be32(0),
@ -2826,8 +2875,8 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
int flags = 0;
size_t cluster_size = DEFAULT_CLUSTER_SIZE;
PreallocMode prealloc;
int version = 3;
uint64_t refcount_bits = 16;
int version;
uint64_t refcount_bits;
int refcount_order;
const char *encryptfmt = NULL;
Error *local_err = NULL;
@ -2849,8 +2898,12 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
} else if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ENCRYPT, false)) {
encryptfmt = "aes";
}
cluster_size = qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
DEFAULT_CLUSTER_SIZE);
cluster_size = qcow2_opt_get_cluster_size_del(opts, &local_err);
if (local_err) {
error_propagate(errp, local_err);
ret = -EINVAL;
goto finish;
}
buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
prealloc = qapi_enum_parse(PreallocMode_lookup, buf,
PREALLOC_MODE__MAX, PREALLOC_MODE_OFF,
@ -2860,16 +2913,10 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
ret = -EINVAL;
goto finish;
}
g_free(buf);
buf = qemu_opt_get_del(opts, BLOCK_OPT_COMPAT_LEVEL);
if (!buf) {
/* keep the default */
} else if (!strcmp(buf, "0.10")) {
version = 2;
} else if (!strcmp(buf, "1.1")) {
version = 3;
} else {
error_setg(errp, "Invalid compatibility level: '%s'", buf);
version = qcow2_opt_get_version_del(opts, &local_err);
if (local_err) {
error_propagate(errp, local_err);
ret = -EINVAL;
goto finish;
}
@ -2892,19 +2939,9 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
goto finish;
}
refcount_bits = qemu_opt_get_number_del(opts, BLOCK_OPT_REFCOUNT_BITS,
refcount_bits);
if (refcount_bits > 64 || !is_power_of_2(refcount_bits)) {
error_setg(errp, "Refcount width must be a power of two and may not "
"exceed 64 bits");
ret = -EINVAL;
goto finish;
}
if (version < 3 && 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)");
refcount_bits = qcow2_opt_get_refcount_bits_del(opts, version, &local_err);
if (local_err) {
error_propagate(errp, local_err);
ret = -EINVAL;
goto finish;
}