* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
-#include "vl.h"
+#include "qemu-common.h"
#include "block_int.h"
#include <zlib.h>
#include "aes.h"
- Size of compressed clusters is stored in sectors to reduce bit usage
in the cluster offsets.
- Support for storing additional data (such as the VM state) in the
- snapshots.
+ snapshots.
- If a backing store is used, the cluster size is not constrained
(could be backported to QCOW).
- L2 tables have always a size of one cluster.
static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
{
const QCowHeader *cow_header = (const void *)buf;
-
+
if (buf_size >= sizeof(QCowHeader) &&
be32_to_cpu(cow_header->magic) == QCOW_MAGIC &&
be32_to_cpu(cow_header->version) == QCOW_VERSION)
be32_to_cpus(&header.refcount_table_clusters);
be64_to_cpus(&header.snapshots_offset);
be32_to_cpus(&header.nb_snapshots);
-
+
if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION)
goto fail;
if (header.size <= 1 ||
if (!s->cluster_data)
goto fail;
s->cluster_cache_offset = -1;
-
+
if (refcount_init(bs) < 0)
goto fail;
BDRVQcowState *s = bs->opaque;
uint8_t keybuf[16];
int len, i;
-
+
memset(keybuf, 0, 16);
len = strlen(key);
if (len > 16)
/* write new table (align to cluster) */
new_l1_table_offset = alloc_clusters(bs, new_l1_size2);
-
+
for(i = 0; i < s->l1_size; i++)
new_l1_table[i] = cpu_to_be64(new_l1_table[i]);
ret = bdrv_pwrite(s->hd, new_l1_table_offset, new_l1_table, new_l1_size2);
goto fail;
for(i = 0; i < s->l1_size; i++)
new_l1_table[i] = be64_to_cpu(new_l1_table[i]);
-
+
/* set new table */
data64 = cpu_to_be64(new_l1_table_offset);
if (bdrv_pwrite(s->hd, offsetof(QCowHeader, l1_table_offset),
BDRVQcowState *s = bs->opaque;
int min_index, i, j, l1_index, l2_index, ret;
uint64_t l2_offset, *l2_table, cluster_offset, tmp, old_l2_offset;
-
+
l1_index = offset >> (s->l2_bits + s->cluster_bits);
if (l1_index >= s->l1_size) {
/* outside l1 table is allowed: we grow the table if needed */
written */
if ((n_end - n_start) < s->cluster_sectors) {
uint64_t start_sect;
-
+
start_sect = (offset & ~(s->cluster_size - 1)) >> 9;
ret = copy_sectors(bs, start_sect,
cluster_offset, 0, n_start);
inflateEnd(strm);
return 0;
}
-
+
static int decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset)
{
int ret, csize, nb_csectors, sector_offset;
BDRVQcowState *s = bs->opaque;
int ret, index_in_cluster, n, n1;
uint64_t cluster_offset;
-
+
while (nb_sectors > 0) {
cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0);
index_in_cluster = sector_num & (s->cluster_sectors - 1);
BDRVQcowState *s = bs->opaque;
int ret, index_in_cluster, n;
uint64_t cluster_offset;
-
+
while (nb_sectors > 0) {
index_in_cluster = sector_num & (s->cluster_sectors - 1);
n = s->cluster_sectors - index_in_cluster;
qemu_aio_release(acb);
return;
}
-
+
/* prepare next AIO request */
acb->cluster_offset = get_cluster_offset(bs, acb->sector_num << 9,
0, 0, 0, 0);
qemu_aio_release(acb);
return;
}
-
+
index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
acb->n = s->cluster_sectors - index_in_cluster;
if (acb->n > acb->nb_sectors)
{
BDRVQcowState *s = bs->opaque;
QCowAIOCB *acb;
-
+
s->cluster_cache_offset = -1; /* disable compressed cache */
acb = qcow_aio_setup(bs, sector_num, (uint8_t*)buf, nb_sectors, cb, opaque);
if (!acb)
return NULL;
-
+
qcow_aio_write_cb(acb, 0);
return &acb->common;
}
QCowHeader header;
uint64_t tmp, offset;
QCowCreateState s1, *s = &s1;
-
+
memset(s, 0, sizeof(*s));
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
s->cluster_size = 1 << s->cluster_bits;
header.cluster_bits = cpu_to_be32(s->cluster_bits);
header_size = (header_size + 7) & ~7;
- if (flags) {
+ if (flags & BLOCK_FLAG_ENCRYPT) {
header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES);
} else {
header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE);
s->refcount_block = qemu_mallocz(s->cluster_size);
if (!s->refcount_block)
goto fail;
-
+
s->refcount_table_offset = offset;
header.refcount_table_offset = cpu_to_be64(offset);
header.refcount_table_clusters = cpu_to_be32(1);
create_refcount_update(s, s->l1_table_offset, l1_size * sizeof(uint64_t));
create_refcount_update(s, s->refcount_table_offset, s->cluster_size);
create_refcount_update(s, s->refcount_block_offset, s->cluster_size);
-
+
/* write all the data */
write(fd, &header, sizeof(header));
if (backing_file) {
}
lseek(fd, s->refcount_table_offset, SEEK_SET);
write(fd, s->refcount_table, s->cluster_size);
-
+
lseek(fd, s->refcount_block_offset, SEEK_SET);
write(fd, s->refcount_block, s->cluster_size);
ret = bdrv_truncate(s->hd, s->l1_table_offset + l1_length);
if (ret < 0)
return ret;
-
+
l2_cache_reset(bs);
#endif
return 0;
return -1;
}
}
-
+
qemu_free(out_buf);
return 0;
}
uint64_t *l1_table, *l2_table, l2_offset, offset, l1_size2, l1_allocated;
int64_t old_offset, old_l2_offset;
int l2_size, i, j, l1_modified, l2_modified, nb_csectors, refcount;
-
+
l2_cache_reset(bs);
l2_table = NULL;
l1_table = s->l1_table;
l1_allocated = 0;
}
-
+
l2_size = s->l2_size * sizeof(uint64_t);
l2_table = qemu_malloc(l2_size);
if (!l2_table)
snapshots_offset = alloc_clusters(bs, snapshots_size);
offset = snapshots_offset;
-
+
for(i = 0; i < s->nb_snapshots; i++) {
sn = s->snapshots + i;
memset(&h, 0, sizeof(h));
h.date_sec = cpu_to_be32(sn->date_sec);
h.date_nsec = cpu_to_be32(sn->date_nsec);
h.vm_clock_nsec = cpu_to_be64(sn->vm_clock_nsec);
-
+
id_str_size = strlen(sn->id_str);
name_size = strlen(sn->name);
h.id_str_size = cpu_to_be16(id_str_size);
{
BDRVQcowState *s = bs->opaque;
int i, ret;
-
+
ret = find_snapshot_by_id(bs, name);
if (ret >= 0)
return ret;
QCowSnapshot *snapshots1, sn1, *sn = &sn1;
int i, ret;
uint64_t *l1_table = NULL;
-
+
memset(sn, 0, sizeof(*sn));
if (sn_info->id_str[0] == '\0') {
BDRVQcowState *s = bs->opaque;
QCowSnapshot *sn;
int snapshot_index, ret;
-
+
snapshot_index = find_snapshot_by_id_or_name(bs, snapshot_id);
if (snapshot_index < 0)
return -ENOENT;
{
BDRVQcowState *s = bs->opaque;
int ret, refcount_table_size2, i;
-
+
s->refcount_block_cache = qemu_malloc(s->cluster_size);
if (!s->refcount_block_cache)
goto fail;
BDRVQcowState *s = bs->opaque;
int64_t offset, cluster_offset;
int free_in_cluster;
-
+
assert(size > 0 && size <= s->cluster_size);
if (s->free_byte_offset == 0) {
s->free_byte_offset = alloc_clusters(bs, s->cluster_size);
BDRVQcowState *s = bs->opaque;
int64_t start, last, cluster_offset;
int k;
-
+
if (size <= 0)
return;
goto fail;
for(i = 0;i < l1_size; i++)
be64_to_cpus(&l1_table[i]);
-
+
l2_size = s->l2_size * sizeof(uint64_t);
l2_table = qemu_malloc(l2_size);
if (!l2_table)
/* header */
inc_refcounts(bs, refcount_table, nb_clusters,
0, s->cluster_size);
-
+
check_refcounts_l1(bs, refcount_table, nb_clusters,
s->l1_table_offset, s->l1_size, 1);
projects / qemu.git / blobdiff