/*
* Block driver for the QCOW format
- *
+ *
* Copyright (c) 2004-2006 Fabrice Bellard
- *
+ *
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* 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"
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_cpu(cow_header->version) == QCOW_VERSION)
return 100;
else
return 0;
be64_to_cpus(&header.size);
be32_to_cpus(&header.crypt_method);
be64_to_cpus(&header.l1_table_offset);
-
+
if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION)
goto fail;
if (header.size <= 1 || header.cluster_bits < 9)
s->l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t));
if (!s->l1_table)
goto fail;
- if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) !=
+ if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) !=
s->l1_size * sizeof(uint64_t))
goto fail;
for(i = 0;i < s->l1_size; i++) {
if (!s->cluster_data)
goto fail;
s->cluster_cache_offset = -1;
-
+
/* read the backing file name */
if (header.backing_file_offset != 0) {
len = header.backing_file_size;
BDRVQcowState *s = bs->opaque;
uint8_t keybuf[16];
int len, i;
-
+
memset(keybuf, 0, 16);
len = strlen(key);
if (len > 16)
for(i = 0; i < nb_sectors; i++) {
ivec.ll[0] = cpu_to_le64(sector_num);
ivec.ll[1] = 0;
- AES_cbc_encrypt(in_buf, out_buf, 512, key,
+ AES_cbc_encrypt(in_buf, out_buf, 512, key,
ivec.b, enc);
sector_num++;
in_buf += 512;
*
* 2 to allocate a compressed cluster of size
* 'compressed_size'. 'compressed_size' must be > 0 and <
- * cluster_size
+ * cluster_size
*
* return 0 if not allocated.
*/
uint64_t l2_offset, *l2_table, cluster_offset, tmp;
uint32_t min_count;
int new_l2_table;
-
+
l1_index = offset >> (s->l2_bits + s->cluster_bits);
l2_offset = s->l1_table[l1_index];
new_l2_table = 0;
/* update the L1 entry */
s->l1_table[l1_index] = l2_offset;
tmp = cpu_to_be64(l2_offset);
- if (bdrv_pwrite(s->hd, s->l1_table_offset + l1_index * sizeof(tmp),
+ if (bdrv_pwrite(s->hd, s->l1_table_offset + l1_index * sizeof(tmp),
&tmp, sizeof(tmp)) != sizeof(tmp))
return 0;
new_l2_table = 1;
s->l2_size * sizeof(uint64_t))
return 0;
} else {
- if (bdrv_pread(s->hd, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) !=
+ if (bdrv_pread(s->hd, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) !=
s->l2_size * sizeof(uint64_t))
return 0;
}
found:
l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1);
cluster_offset = be64_to_cpu(l2_table[l2_index]);
- if (!cluster_offset ||
+ if (!cluster_offset ||
((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) {
if (!allocate)
return 0;
if (decompress_cluster(s, cluster_offset) < 0)
return 0;
cluster_offset = bdrv_getlength(s->hd);
- cluster_offset = (cluster_offset + s->cluster_size - 1) &
+ cluster_offset = (cluster_offset + s->cluster_size - 1) &
~(s->cluster_size - 1);
/* write the cluster content */
- if (bdrv_pwrite(s->hd, cluster_offset, s->cluster_cache, s->cluster_size) !=
+ if (bdrv_pwrite(s->hd, cluster_offset, s->cluster_cache, s->cluster_size) !=
s->cluster_size)
return -1;
} else {
cluster_offset = bdrv_getlength(s->hd);
- if (allocate == 1) {
- /* round to cluster size */
- cluster_offset = (cluster_offset + s->cluster_size - 1) &
- ~(s->cluster_size - 1);
- bdrv_truncate(s->hd, cluster_offset + s->cluster_size);
- /* if encrypted, we must initialize the cluster
- content which won't be written */
- if (s->crypt_method &&
- (n_end - n_start) < s->cluster_sectors) {
- uint64_t start_sect;
- start_sect = (offset & ~(s->cluster_size - 1)) >> 9;
- memset(s->cluster_data + 512, 0x00, 512);
- for(i = 0; i < s->cluster_sectors; i++) {
- if (i < n_start || i >= n_end) {
- encrypt_sectors(s, start_sect + i,
- s->cluster_data,
- s->cluster_data + 512, 1, 1,
- &s->aes_encrypt_key);
- if (bdrv_pwrite(s->hd, cluster_offset + i * 512,
- s->cluster_data, 512) != 512)
- return -1;
- }
+ /* round to cluster size */
+ cluster_offset = (cluster_offset + s->cluster_size - 1) &
+ ~(s->cluster_size - 1);
+ bdrv_truncate(s->hd, cluster_offset + s->cluster_size);
+ /* if encrypted, we must initialize the cluster
+ content which won't be written */
+ if (s->crypt_method &&
+ (n_end - n_start) < s->cluster_sectors) {
+ uint64_t start_sect;
+ start_sect = (offset & ~(s->cluster_size - 1)) >> 9;
+ memset(s->cluster_data + 512, 0x00, 512);
+ for(i = 0; i < s->cluster_sectors; i++) {
+ if (i < n_start || i >= n_end) {
+ encrypt_sectors(s, start_sect + i,
+ s->cluster_data,
+ s->cluster_data + 512, 1, 1,
+ &s->aes_encrypt_key);
+ if (bdrv_pwrite(s->hd, cluster_offset + i * 512,
+ s->cluster_data, 512) != 512)
+ return -1;
}
}
- } else {
- cluster_offset |= QCOW_OFLAG_COMPRESSED |
- (uint64_t)compressed_size << (63 - s->cluster_bits);
}
}
/* update L2 table */
tmp = cpu_to_be64(cluster_offset);
l2_table[l2_index] = tmp;
- if (bdrv_pwrite(s->hd,
+ if (bdrv_pwrite(s->hd,
l2_offset + l2_index * sizeof(tmp), &tmp, sizeof(tmp)) != sizeof(tmp))
return 0;
}
return cluster_offset;
}
-static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num,
+static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum)
{
BDRVQcowState *s = bs->opaque;
inflateEnd(strm);
return 0;
}
-
+
static int decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset)
{
int ret, csize;
csize = cluster_offset >> (63 - s->cluster_bits);
csize &= (s->cluster_size - 1);
ret = bdrv_pread(s->hd, coffset, s->cluster_data, csize);
- if (ret != csize)
+ if (ret != csize)
return -1;
if (decompress_buffer(s->cluster_cache, s->cluster_size,
s->cluster_data, csize) < 0) {
#if 0
-static int qcow_read(BlockDriverState *bs, int64_t sector_num,
+static int qcow_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
BDRVQcowState *s = bs->opaque;
int ret, index_in_cluster, n;
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);
memcpy(buf, s->cluster_cache + index_in_cluster * 512, 512 * n);
} else {
ret = bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512);
- if (ret != n * 512)
+ if (ret != n * 512)
return -1;
if (s->crypt_method) {
- encrypt_sectors(s, sector_num, buf, buf, n, 0,
+ encrypt_sectors(s, sector_num, buf, buf, n, 0,
&s->aes_decrypt_key);
}
}
}
#endif
-static int qcow_write(BlockDriverState *bs, int64_t sector_num,
+static int qcow_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
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;
if (n > nb_sectors)
n = nb_sectors;
- cluster_offset = get_cluster_offset(bs, sector_num << 9, 1, 0,
- index_in_cluster,
+ cluster_offset = get_cluster_offset(bs, sector_num << 9, 1, 0,
+ index_in_cluster,
index_in_cluster + n);
if (!cluster_offset)
return -1;
if (s->crypt_method) {
encrypt_sectors(s, sector_num, s->cluster_data, buf, n, 1,
&s->aes_encrypt_key);
- ret = bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512,
+ ret = bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512,
s->cluster_data, n * 512);
} else {
ret = bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512);
}
- if (ret != n * 512)
+ if (ret != n * 512)
return -1;
nb_sectors -= n;
sector_num += n;
int nb_sectors;
int n;
uint64_t cluster_offset;
- uint8_t *cluster_data;
+ uint8_t *cluster_data;
BlockDriverAIOCB *hd_aiocb;
} QCowAIOCB;
/* nothing to do */
} else {
if (s->crypt_method) {
- encrypt_sectors(s, acb->sector_num, acb->buf, acb->buf,
- acb->n, 0,
+ encrypt_sectors(s, acb->sector_num, acb->buf, acb->buf,
+ acb->n, 0,
&s->aes_decrypt_key);
}
}
qemu_aio_release(acb);
return;
}
-
+
/* prepare next AIO request */
- acb->cluster_offset = get_cluster_offset(bs, acb->sector_num << 9,
+ acb->cluster_offset = get_cluster_offset(bs, acb->sector_num << 9,
0, 0, 0, 0);
index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
acb->n = s->cluster_sectors - index_in_cluster;
/* add AIO support for compressed blocks ? */
if (decompress_cluster(s, acb->cluster_offset) < 0)
goto fail;
- memcpy(acb->buf,
+ memcpy(acb->buf,
s->cluster_cache + index_in_cluster * 512, 512 * acb->n);
goto redo;
} else {
goto fail;
}
acb->hd_aiocb = bdrv_aio_read(s->hd,
- (acb->cluster_offset >> 9) + index_in_cluster,
+ (acb->cluster_offset >> 9) + index_in_cluster,
acb->buf, acb->n, qcow_aio_read_cb, acb);
if (acb->hd_aiocb == NULL)
goto fail;
acb->buf = buf;
acb->nb_sectors = nb_sectors;
acb->n = 0;
- acb->cluster_offset = 0;
+ acb->cluster_offset = 0;
qcow_aio_read_cb(acb, 0);
return &acb->common;
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)
acb->n = acb->nb_sectors;
- cluster_offset = get_cluster_offset(bs, acb->sector_num << 9, 1, 0,
- index_in_cluster,
+ cluster_offset = get_cluster_offset(bs, acb->sector_num << 9, 1, 0,
+ index_in_cluster,
index_in_cluster + acb->n);
if (!cluster_offset || (cluster_offset & 511) != 0) {
ret = -EIO;
goto fail;
}
}
- encrypt_sectors(s, acb->sector_num, acb->cluster_data, acb->buf,
+ encrypt_sectors(s, acb->sector_num, acb->cluster_data, acb->buf,
acb->n, 1, &s->aes_encrypt_key);
src_buf = acb->cluster_data;
} else {
src_buf = acb->buf;
}
acb->hd_aiocb = bdrv_aio_write(s->hd,
- (cluster_offset >> 9) + index_in_cluster,
- src_buf, acb->n,
+ (cluster_offset >> 9) + index_in_cluster,
+ src_buf, acb->n,
qcow_aio_write_cb, acb);
if (acb->hd_aiocb == NULL)
goto fail;
{
BDRVQcowState *s = bs->opaque;
QCowAIOCB *acb;
-
+
s->cluster_cache_offset = -1; /* disable compressed cache */
acb = qemu_aio_get(bs, cb, opaque);
acb->buf = (uint8_t *)buf;
acb->nb_sectors = nb_sectors;
acb->n = 0;
-
+
qcow_aio_write_cb(acb, 0);
return &acb->common;
}
header_size = sizeof(header);
backing_filename_len = 0;
if (backing_file) {
- header.backing_file_offset = cpu_to_be64(header_size);
- backing_filename_len = strlen(backing_file);
- header.backing_file_size = cpu_to_be32(backing_filename_len);
- header_size += backing_filename_len;
- header.mtime = cpu_to_be32(0);
+ if (strcmp(backing_file, "fat:")) {
+ header.backing_file_offset = cpu_to_be64(header_size);
+ backing_filename_len = strlen(backing_file);
+ header.backing_file_size = cpu_to_be32(backing_filename_len);
+ header_size += backing_filename_len;
+ } else {
+ /* special backing file for vvfat */
+ backing_file = NULL;
+ }
header.cluster_bits = 9; /* 512 byte cluster to avoid copying
unmodifyed sectors */
header.l2_bits = 12; /* 32 KB L2 tables */
l1_size = ((total_size * 512) + (1LL << shift) - 1) >> shift;
header.l1_table_offset = cpu_to_be64(header_size);
- 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);
}
-
+
/* write all the data */
write(fd, &header, sizeof(header));
if (backing_file) {
/* XXX: put compressed sectors first, then all the cluster aligned
tables to avoid losing bytes in alignment */
-static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
+static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
BDRVQcowState *s = bs->opaque;
/* best compression, small window, no zlib header */
memset(&strm, 0, sizeof(strm));
ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION,
- Z_DEFLATED, -12,
+ Z_DEFLATED, -12,
9, Z_DEFAULT_STRATEGY);
if (ret != 0) {
qemu_free(out_buf);
/* could not compress: write normal cluster */
qcow_write(bs, sector_num, buf, s->cluster_sectors);
} else {
- cluster_offset = get_cluster_offset(bs, sector_num << 9, 2,
+ cluster_offset = get_cluster_offset(bs, sector_num << 9, 2,
out_len, 0, 0);
cluster_offset &= s->cluster_offset_mask;
if (bdrv_pwrite(s->hd, cluster_offset, out_buf, out_len) != out_len) {
return -1;
}
}
-
+
qemu_free(out_buf);
return 0;
}
projects / qemu.git / blobdiff