*/
#include "vl.h"
#include "block_int.h"
-#include "zlib.h"
+#include <zlib.h>
#include "aes.h"
/**************************************************************/
static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
{
const QCowHeader *cow_header = (const void *)buf;
-
- if (be32_to_cpu(cow_header->magic) == QCOW_MAGIC &&
+
+ if (buf_size >= sizeof(QCowHeader) &&
+ be32_to_cpu(cow_header->magic) == QCOW_MAGIC &&
be32_to_cpu(cow_header->version) == QCOW_VERSION)
return 100;
else
s->l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t));
if (!s->l1_table)
goto fail;
- lseek64(fd, s->l1_table_offset, SEEK_SET);
+ lseek(fd, s->l1_table_offset, SEEK_SET);
if (read(fd, s->l1_table, s->l1_size * sizeof(uint64_t)) !=
s->l1_size * sizeof(uint64_t))
goto fail;
len = header.backing_file_size;
if (len > 1023)
len = 1023;
- lseek64(fd, header.backing_file_offset, SEEK_SET);
+ lseek(fd, header.backing_file_offset, SEEK_SET);
if (read(fd, bs->backing_file, len) != len)
goto fail;
bs->backing_file[len] = '\0';
if (!allocate)
return 0;
/* allocate a new l2 entry */
- l2_offset = lseek64(s->fd, 0, SEEK_END);
+ l2_offset = lseek(s->fd, 0, SEEK_END);
/* round to cluster size */
l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1);
/* update the L1 entry */
s->l1_table[l1_index] = l2_offset;
tmp = cpu_to_be64(l2_offset);
- lseek64(s->fd, s->l1_table_offset + l1_index * sizeof(tmp), SEEK_SET);
+ lseek(s->fd, s->l1_table_offset + l1_index * sizeof(tmp), SEEK_SET);
if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp))
return 0;
new_l2_table = 1;
overwritten */
if (decompress_cluster(s, cluster_offset) < 0)
return 0;
- cluster_offset = lseek64(s->fd, 0, SEEK_END);
+ cluster_offset = lseek(s->fd, 0, SEEK_END);
cluster_offset = (cluster_offset + s->cluster_size - 1) &
~(s->cluster_size - 1);
/* write the cluster content */
- lseek64(s->fd, cluster_offset, SEEK_SET);
+ lseek(s->fd, cluster_offset, SEEK_SET);
if (write(s->fd, s->cluster_cache, s->cluster_size) !=
s->cluster_size)
return -1;
} else {
- cluster_offset = lseek64(s->fd, 0, SEEK_END);
+ cluster_offset = lseek(s->fd, 0, SEEK_END);
if (allocate == 1) {
/* round to cluster size */
cluster_offset = (cluster_offset + s->cluster_size - 1) &
s->cluster_data,
s->cluster_data + 512, 1, 1,
&s->aes_encrypt_key);
- lseek64(s->fd, cluster_offset + i * 512, SEEK_SET);
+ lseek(s->fd, cluster_offset + i * 512, SEEK_SET);
if (write(s->fd, s->cluster_data, 512) != 512)
return -1;
}
/* update L2 table */
tmp = cpu_to_be64(cluster_offset);
l2_table[l2_index] = tmp;
- lseek64(s->fd, l2_offset + l2_index * sizeof(tmp), SEEK_SET);
+ lseek(s->fd, l2_offset + l2_index * sizeof(tmp), SEEK_SET);
if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp))
return 0;
}
if (s->cluster_cache_offset != coffset) {
csize = cluster_offset >> (63 - s->cluster_bits);
csize &= (s->cluster_size - 1);
- lseek64(s->fd, coffset, SEEK_SET);
+ lseek(s->fd, coffset, SEEK_SET);
ret = read(s->fd, s->cluster_data, csize);
if (ret != csize)
return -1;
return -1;
memcpy(buf, s->cluster_cache + index_in_cluster * 512, 512 * n);
} else {
- lseek64(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET);
+ lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET);
ret = read(s->fd, buf, n * 512);
if (ret != n * 512)
return -1;
index_in_cluster + n);
if (!cluster_offset)
return -1;
- lseek64(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET);
+ lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET);
if (s->crypt_method) {
encrypt_sectors(s, sector_num, s->cluster_data, buf, n, 1,
&s->aes_encrypt_key);
return 0;
}
-static int qcow_close(BlockDriverState *bs)
+static void qcow_close(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
qemu_free(s->l1_table);
header_size = sizeof(header);
backing_filename_len = 0;
if (backing_file) {
- realpath(backing_file, backing_filename);
- if (stat(backing_filename, &st) != 0) {
- return -1;
- }
+ if (strcmp(backing_file, "fat:")) {
+ const char *p;
+ /* XXX: this is a hack: we do not attempt to check for URL
+ like syntax */
+ p = strchr(backing_file, ':');
+ if (p && (p - backing_file) >= 2) {
+ /* URL like but exclude "c:" like filenames */
+ pstrcpy(backing_filename, sizeof(backing_filename),
+ backing_file);
+ } else {
+ realpath(backing_file, backing_filename);
+ if (stat(backing_filename, &st) != 0) {
+ return -1;
+ }
+ }
+ header.backing_file_offset = cpu_to_be64(header_size);
+ backing_filename_len = strlen(backing_filename);
+ header.backing_file_size = cpu_to_be32(backing_filename_len);
+ header_size += backing_filename_len;
+ } else
+ backing_file = NULL;
header.mtime = cpu_to_be32(st.st_mtime);
- header.backing_file_offset = cpu_to_be64(header_size);
- backing_filename_len = strlen(backing_filename);
- header.backing_file_size = cpu_to_be32(backing_filename_len);
- header_size += backing_filename_len;
header.cluster_bits = 9; /* 512 byte cluster to avoid copying
unmodifyed sectors */
header.l2_bits = 12; /* 32 KB L2 tables */
return 0;
}
+int qcow_make_empty(BlockDriverState *bs)
+{
+ BDRVQcowState *s = bs->opaque;
+ uint32_t l1_length = s->l1_size * sizeof(uint64_t);
+
+ memset(s->l1_table, 0, l1_length);
+ lseek(s->fd, s->l1_table_offset, SEEK_SET);
+ if (write(s->fd, s->l1_table, l1_length) < 0)
+ return -1;
+ ftruncate(s->fd, s->l1_table_offset + l1_length);
+
+ memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
+ memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t));
+ memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t));
+
+ return 0;
+}
+
int qcow_get_cluster_size(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
cluster_offset = get_cluster_offset(bs, sector_num << 9, 2,
out_len, 0, 0);
cluster_offset &= s->cluster_offset_mask;
- lseek64(s->fd, cluster_offset, SEEK_SET);
+ lseek(s->fd, cluster_offset, SEEK_SET);
if (write(s->fd, out_buf, out_len) != out_len) {
qemu_free(out_buf);
return -1;
qcow_create,
qcow_is_allocated,
qcow_set_key,
+ qcow_make_empty
};
projects / qemu / blobdiff