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new disk image layer

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1037 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-08-01 21:59:26 +00:00
parent e4d4fe3c34
commit ea2384d36e
7 changed files with 2383 additions and 421 deletions
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263
block-cow.c Normal file
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/*
* Block driver for the COW format
*
* Copyright (c) 2004 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
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _WIN32
#include "vl.h"
#include "block_int.h"
#include <sys/mman.h>
/**************************************************************/
/* COW block driver using file system holes */
/* user mode linux compatible COW file */
#define COW_MAGIC 0x4f4f4f4d /* MOOO */
#define COW_VERSION 2
struct cow_header_v2 {
uint32_t magic;
uint32_t version;
char backing_file[1024];
int32_t mtime;
uint64_t size;
uint32_t sectorsize;
};
typedef struct BDRVCowState {
int fd;
uint8_t *cow_bitmap; /* if non NULL, COW mappings are used first */
uint8_t *cow_bitmap_addr; /* mmap address of cow_bitmap */
int cow_bitmap_size;
int64_t cow_sectors_offset;
} BDRVCowState;
static int cow_probe(const uint8_t *buf, int buf_size, const char *filename)
{
const struct cow_header_v2 *cow_header = (const void *)buf;
if (be32_to_cpu(cow_header->magic) == COW_MAGIC &&
be32_to_cpu(cow_header->version) == COW_VERSION)
return 100;
else
return 0;
}
static int cow_open(BlockDriverState *bs, const char *filename)
{
BDRVCowState *s = bs->opaque;
int fd;
struct cow_header_v2 cow_header;
int64_t size;
fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
if (fd < 0) {
fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
if (fd < 0)
return -1;
}
s->fd = fd;
/* see if it is a cow image */
if (read(fd, &cow_header, sizeof(cow_header)) != sizeof(cow_header)) {
goto fail;
}
if (be32_to_cpu(cow_header.magic) != COW_MAGIC ||
be32_to_cpu(cow_header.version) != COW_VERSION) {
goto fail;
}
/* cow image found */
size = be64_to_cpu(cow_header.size);
bs->total_sectors = size / 512;
pstrcpy(bs->backing_file, sizeof(bs->backing_file),
cow_header.backing_file);
#if 0
if (cow_header.backing_file[0] != '\0') {
if (stat(cow_header.backing_file, &st) != 0) {
fprintf(stderr, "%s: could not find original disk image '%s'\n", filename, cow_header.backing_file);
goto fail;
}
if (st.st_mtime != be32_to_cpu(cow_header.mtime)) {
fprintf(stderr, "%s: original raw disk image '%s' does not match saved timestamp\n", filename, cow_header.backing_file);
goto fail;
}
fd = open(cow_header.backing_file, O_RDONLY | O_LARGEFILE);
if (fd < 0)
goto fail;
bs->fd = fd;
}
#endif
/* mmap the bitmap */
s->cow_bitmap_size = ((bs->total_sectors + 7) >> 3) + sizeof(cow_header);
s->cow_bitmap_addr = mmap(get_mmap_addr(s->cow_bitmap_size),
s->cow_bitmap_size,
PROT_READ | PROT_WRITE,
MAP_SHARED, s->fd, 0);
if (s->cow_bitmap_addr == MAP_FAILED)
goto fail;
s->cow_bitmap = s->cow_bitmap_addr + sizeof(cow_header);
s->cow_sectors_offset = (s->cow_bitmap_size + 511) & ~511;
return 0;
fail:
close(fd);
return -1;
}
static inline void set_bit(uint8_t *bitmap, int64_t bitnum)
{
bitmap[bitnum / 8] |= (1 << (bitnum%8));
}
static inline int is_bit_set(const uint8_t *bitmap, int64_t bitnum)
{
return !!(bitmap[bitnum / 8] & (1 << (bitnum%8)));
}
/* Return true if first block has been changed (ie. current version is
* in COW file). Set the number of continuous blocks for which that
* is true. */
static inline int is_changed(uint8_t *bitmap,
int64_t sector_num, int nb_sectors,
int *num_same)
{
int changed;
if (!bitmap || nb_sectors == 0) {
*num_same = nb_sectors;
return 0;
}
changed = is_bit_set(bitmap, sector_num);
for (*num_same = 1; *num_same < nb_sectors; (*num_same)++) {
if (is_bit_set(bitmap, sector_num + *num_same) != changed)
break;
}
return changed;
}
static int cow_is_allocated(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum)
{
BDRVCowState *s = bs->opaque;
return is_changed(s->cow_bitmap, sector_num, nb_sectors, pnum);
}
static int cow_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
BDRVCowState *s = bs->opaque;
int ret, n;
while (nb_sectors > 0) {
if (is_changed(s->cow_bitmap, sector_num, nb_sectors, &n)) {
lseek64(s->fd, s->cow_sectors_offset + sector_num * 512, SEEK_SET);
ret = read(s->fd, buf, n * 512);
if (ret != n * 512)
return -1;
} else {
memset(buf, 0, n * 512);
}
nb_sectors -= n;
sector_num += n;
buf += n * 512;
}
return 0;
}
static int cow_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
BDRVCowState *s = bs->opaque;
int ret, i;
lseek64(s->fd, s->cow_sectors_offset + sector_num * 512, SEEK_SET);
ret = write(s->fd, buf, nb_sectors * 512);
if (ret != nb_sectors * 512)
return -1;
for (i = 0; i < nb_sectors; i++)
set_bit(s->cow_bitmap, sector_num + i);
return 0;
}
static int cow_close(BlockDriverState *bs)
{
BDRVCowState *s = bs->opaque;
munmap(s->cow_bitmap_addr, s->cow_bitmap_size);
close(s->fd);
}
static int cow_create(const char *filename, int64_t image_sectors,
const char *image_filename, int flags)
{
int fd, cow_fd;
struct cow_header_v2 cow_header;
struct stat st;
if (flags)
return -ENOTSUP;
cow_fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
0644);
if (cow_fd < 0)
return -1;
memset(&cow_header, 0, sizeof(cow_header));
cow_header.magic = cpu_to_be32(COW_MAGIC);
cow_header.version = cpu_to_be32(COW_VERSION);
if (image_filename) {
fd = open(image_filename, O_RDONLY | O_BINARY);
if (fd < 0) {
close(cow_fd);
return -1;
}
if (fstat(fd, &st) != 0) {
close(fd);
return -1;
}
close(fd);
cow_header.mtime = cpu_to_be32(st.st_mtime);
realpath(image_filename, cow_header.backing_file);
}
cow_header.sectorsize = cpu_to_be32(512);
cow_header.size = cpu_to_be64(image_sectors * 512);
write(cow_fd, &cow_header, sizeof(cow_header));
/* resize to include at least all the bitmap */
ftruncate(cow_fd, sizeof(cow_header) + ((image_sectors + 7) >> 3));
close(cow_fd);
return 0;
}
BlockDriver bdrv_cow = {
"cow",
sizeof(BDRVCowState),
cow_probe,
cow_open,
cow_read,
cow_write,
cow_close,
cow_create,
cow_is_allocated,
};
#endif

677
block-qcow.c Normal file
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/*
* Block driver for the QCOW format
*
* Copyright (c) 2004 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
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vl.h"
#include "block_int.h"
#include "zlib.h"
#include "aes.h"
/**************************************************************/
/* QEMU COW block driver with compression and encryption support */
#define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
#define QCOW_VERSION 1
#define QCOW_CRYPT_NONE 0
#define QCOW_CRYPT_AES 1
#define QCOW_OFLAG_COMPRESSED (1LL << 63)
typedef struct QCowHeader {
uint32_t magic;
uint32_t version;
uint64_t backing_file_offset;
uint32_t backing_file_size;
uint32_t mtime;
uint64_t size; /* in bytes */
uint8_t cluster_bits;
uint8_t l2_bits;
uint32_t crypt_method;
uint64_t l1_table_offset;
} QCowHeader;
#define L2_CACHE_SIZE 16
typedef struct BDRVQcowState {
int fd;
int cluster_bits;
int cluster_size;
int cluster_sectors;
int l2_bits;
int l2_size;
int l1_size;
uint64_t cluster_offset_mask;
uint64_t l1_table_offset;
uint64_t *l1_table;
uint64_t *l2_cache;
uint64_t l2_cache_offsets[L2_CACHE_SIZE];
uint32_t l2_cache_counts[L2_CACHE_SIZE];
uint8_t *cluster_cache;
uint8_t *cluster_data;
uint64_t cluster_cache_offset;
uint32_t crypt_method; /* current crypt method, 0 if no key yet */
uint32_t crypt_method_header;
AES_KEY aes_encrypt_key;
AES_KEY aes_decrypt_key;
} BDRVQcowState;
static int decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset);
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 &&
be32_to_cpu(cow_header->version) == QCOW_VERSION)
return 100;
else
return 0;
}
static int qcow_open(BlockDriverState *bs, const char *filename)
{
BDRVQcowState *s = bs->opaque;
int fd, len, i, shift;
QCowHeader header;
fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
if (fd < 0) {
fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
if (fd < 0)
return -1;
}
s->fd = fd;
if (read(fd, &header, sizeof(header)) != sizeof(header))
goto fail;
be32_to_cpus(&header.magic);
be32_to_cpus(&header.version);
be64_to_cpus(&header.backing_file_offset);
be32_to_cpus(&header.backing_file_size);
be32_to_cpus(&header.mtime);
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)
goto fail;
if (header.crypt_method > QCOW_CRYPT_AES)
goto fail;
s->crypt_method_header = header.crypt_method;
if (s->crypt_method_header)
bs->encrypted = 1;
s->cluster_bits = header.cluster_bits;
s->cluster_size = 1 << s->cluster_bits;
s->cluster_sectors = 1 << (s->cluster_bits - 9);
s->l2_bits = header.l2_bits;
s->l2_size = 1 << s->l2_bits;
bs->total_sectors = header.size / 512;
s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1;
/* read the level 1 table */
shift = s->cluster_bits + s->l2_bits;
s->l1_size = (header.size + (1LL << shift) - 1) >> shift;
s->l1_table_offset = header.l1_table_offset;
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);
if (read(fd, 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++) {
be64_to_cpus(&s->l1_table[i]);
}
/* alloc L2 cache */
s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
if (!s->l2_cache)
goto fail;
s->cluster_cache = qemu_malloc(s->cluster_size);
if (!s->cluster_cache)
goto fail;
s->cluster_data = qemu_malloc(s->cluster_size);
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;
if (len > 1023)
len = 1023;
lseek64(fd, header.backing_file_offset, SEEK_SET);
if (read(fd, bs->backing_file, len) != len)
goto fail;
bs->backing_file[len] = '\0';
}
return 0;
fail:
qemu_free(s->l1_table);
qemu_free(s->l2_cache);
qemu_free(s->cluster_cache);
qemu_free(s->cluster_data);
close(fd);
return -1;
}
static int qcow_set_key(BlockDriverState *bs, const char *key)
{
BDRVQcowState *s = bs->opaque;
uint8_t keybuf[16];
int len, i;
memset(keybuf, 0, 16);
len = strlen(key);
if (len > 16)
len = 16;
/* XXX: we could compress the chars to 7 bits to increase
entropy */
for(i = 0;i < len;i++) {
keybuf[i] = key[i];
}
s->crypt_method = s->crypt_method_header;
if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0)
return -1;
if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0)
return -1;
#if 0
/* test */
{
uint8_t in[16];
uint8_t out[16];
uint8_t tmp[16];
for(i=0;i<16;i++)
in[i] = i;
AES_encrypt(in, tmp, &s->aes_encrypt_key);
AES_decrypt(tmp, out, &s->aes_decrypt_key);
for(i = 0; i < 16; i++)
printf(" %02x", tmp[i]);
printf("\n");
for(i = 0; i < 16; i++)
printf(" %02x", out[i]);
printf("\n");
}
#endif
return 0;
}
/* The crypt function is compatible with the linux cryptoloop
algorithm for < 4 GB images. NOTE: out_buf == in_buf is
supported */
static void encrypt_sectors(BDRVQcowState *s, int64_t sector_num,
uint8_t *out_buf, const uint8_t *in_buf,
int nb_sectors, int enc,
const AES_KEY *key)
{
union {
uint64_t ll[2];
uint8_t b[16];
} ivec;
int i;
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,
ivec.b, enc);
sector_num++;
in_buf += 512;
out_buf += 512;
}
}
/* 'allocate' is:
*
* 0 to not allocate.
*
* 1 to allocate a normal cluster (for sector indexes 'n_start' to
* 'n_end')
*
* 2 to allocate a compressed cluster of size
* 'compressed_size'. 'compressed_size' must be > 0 and <
* cluster_size
*
* return 0 if not allocated.
*/
static uint64_t get_cluster_offset(BlockDriverState *bs,
uint64_t offset, int allocate,
int compressed_size,
int n_start, int n_end)
{
BDRVQcowState *s = bs->opaque;
int min_index, i, j, l1_index, l2_index;
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;
if (!l2_offset) {
if (!allocate)
return 0;
/* allocate a new l2 entry */
l2_offset = lseek64(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);
if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp))
return 0;
new_l2_table = 1;
}
for(i = 0; i < L2_CACHE_SIZE; i++) {
if (l2_offset == s->l2_cache_offsets[i]) {
/* increment the hit count */
if (++s->l2_cache_counts[i] == 0xffffffff) {
for(j = 0; j < L2_CACHE_SIZE; j++) {
s->l2_cache_counts[j] >>= 1;
}
}
l2_table = s->l2_cache + (i << s->l2_bits);
goto found;
}
}
/* not found: load a new entry in the least used one */
min_index = 0;
min_count = 0xffffffff;
for(i = 0; i < L2_CACHE_SIZE; i++) {
if (s->l2_cache_counts[i] < min_count) {
min_count = s->l2_cache_counts[i];
min_index = i;
}
}
l2_table = s->l2_cache + (min_index << s->l2_bits);
lseek(s->fd, l2_offset, SEEK_SET);
if (new_l2_table) {
memset(l2_table, 0, s->l2_size * sizeof(uint64_t));
if (write(s->fd, l2_table, s->l2_size * sizeof(uint64_t)) !=
s->l2_size * sizeof(uint64_t))
return 0;
} else {
if (read(s->fd, l2_table, s->l2_size * sizeof(uint64_t)) !=
s->l2_size * sizeof(uint64_t))
return 0;
}
s->l2_cache_offsets[min_index] = l2_offset;
s->l2_cache_counts[min_index] = 1;
found:
l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1);
cluster_offset = be64_to_cpu(l2_table[l2_index]);
if (!cluster_offset ||
((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) {
if (!allocate)
return 0;
/* allocate a new cluster */
if ((cluster_offset & QCOW_OFLAG_COMPRESSED) &&
(n_end - n_start) < s->cluster_sectors) {
/* if the cluster is already compressed, we must
decompress it in the case it is not completely
overwritten */
if (decompress_cluster(s, cluster_offset) < 0)
return 0;
cluster_offset = lseek64(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);
if (write(s->fd, s->cluster_cache, s->cluster_size) !=
s->cluster_size)
return -1;
} else {
cluster_offset = lseek64(s->fd, 0, SEEK_END);
if (allocate == 1) {
/* round to cluster size */
cluster_offset = (cluster_offset + s->cluster_size - 1) &
~(s->cluster_size - 1);
ftruncate(s->fd, 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, 0xaa, 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);
lseek64(s->fd, cluster_offset + i * 512, SEEK_SET);
if (write(s->fd, 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;
lseek64(s->fd, l2_offset + l2_index * sizeof(tmp), SEEK_SET);
if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp))
return 0;
}
return cluster_offset;
}
static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum)
{
BDRVQcowState *s = bs->opaque;
int index_in_cluster, n;
uint64_t cluster_offset;
cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0);
index_in_cluster = sector_num & (s->cluster_sectors - 1);
n = s->cluster_sectors - index_in_cluster;
if (n > nb_sectors)
n = nb_sectors;
*pnum = n;
return (cluster_offset != 0);
}
static int decompress_buffer(uint8_t *out_buf, int out_buf_size,
const uint8_t *buf, int buf_size)
{
z_stream strm1, *strm = &strm1;
int ret, out_len;
memset(strm, 0, sizeof(*strm));
strm->next_in = (uint8_t *)buf;
strm->avail_in = buf_size;
strm->next_out = out_buf;
strm->avail_out = out_buf_size;
ret = inflateInit2(strm, -12);
if (ret != Z_OK)
return -1;
ret = inflate(strm, Z_FINISH);
out_len = strm->next_out - out_buf;
if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) ||
out_len != out_buf_size) {
inflateEnd(strm);
return -1;
}
inflateEnd(strm);
return 0;
}
static int decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset)
{
int ret, csize;
uint64_t coffset;
coffset = cluster_offset & s->cluster_offset_mask;
if (s->cluster_cache_offset != coffset) {
csize = cluster_offset >> (63 - s->cluster_bits);
csize &= (s->cluster_size - 1);
lseek64(s->fd, coffset, SEEK_SET);
ret = read(s->fd, s->cluster_data, csize);
if (ret != csize)
return -1;
if (decompress_buffer(s->cluster_cache, s->cluster_size,
s->cluster_data, csize) < 0) {
return -1;
}
s->cluster_cache_offset = coffset;
}
return 0;
}
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);
n = s->cluster_sectors - index_in_cluster;
if (n > nb_sectors)
n = nb_sectors;
if (!cluster_offset) {
memset(buf, 0, 512 * n);
} else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
if (decompress_cluster(s, cluster_offset) < 0)
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);
ret = read(s->fd, buf, n * 512);
if (ret != n * 512)
return -1;
if (s->crypt_method) {
encrypt_sectors(s, sector_num, buf, buf, n, 0,
&s->aes_decrypt_key);
}
}
nb_sectors -= n;
sector_num += n;
buf += n * 512;
}
return 0;
}
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,
index_in_cluster + n);
if (!cluster_offset)
return -1;
lseek64(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);
ret = write(s->fd, s->cluster_data, n * 512);
} else {
ret = write(s->fd, buf, n * 512);
}
if (ret != n * 512)
return -1;
nb_sectors -= n;
sector_num += n;
buf += n * 512;
}
s->cluster_cache_offset = -1; /* disable compressed cache */
return 0;
}
static int qcow_close(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
qemu_free(s->l1_table);
qemu_free(s->l2_cache);
qemu_free(s->cluster_cache);
qemu_free(s->cluster_data);
close(s->fd);
}
static int qcow_create(const char *filename, int64_t total_size,
const char *backing_file, int flags)
{
int fd, header_size, backing_filename_len, l1_size, i, shift;
QCowHeader header;
char backing_filename[1024];
uint64_t tmp;
struct stat st;
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
0644);
if (fd < 0)
return -1;
memset(&header, 0, sizeof(header));
header.magic = cpu_to_be32(QCOW_MAGIC);
header.version = cpu_to_be32(QCOW_VERSION);
header.size = cpu_to_be64(total_size * 512);
header_size = sizeof(header);
backing_filename_len = 0;
if (backing_file) {
realpath(backing_file, backing_filename);
if (stat(backing_filename, &st) != 0) {
return -1;
}
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 */
} else {
header.cluster_bits = 12; /* 4 KB clusters */
header.l2_bits = 9; /* 4 KB L2 tables */
}
header_size = (header_size + 7) & ~7;
shift = header.cluster_bits + header.l2_bits;
l1_size = ((total_size * 512) + (1LL << shift) - 1) >> shift;
header.l1_table_offset = cpu_to_be64(header_size);
if (flags) {
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) {
write(fd, backing_filename, backing_filename_len);
}
lseek(fd, header_size, SEEK_SET);
tmp = 0;
for(i = 0;i < l1_size; i++) {
write(fd, &tmp, sizeof(tmp));
}
close(fd);
return 0;
}
int qcow_get_cluster_size(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
if (bs->drv != &bdrv_qcow)
return -1;
return s->cluster_size;
}
/* XXX: put compressed sectors first, then all the cluster aligned
tables to avoid losing bytes in alignment */
int qcow_compress_cluster(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf)
{
BDRVQcowState *s = bs->opaque;
z_stream strm;
int ret, out_len;
uint8_t *out_buf;
uint64_t cluster_offset;
if (bs->drv != &bdrv_qcow)
return -1;
out_buf = qemu_malloc(s->cluster_size + (s->cluster_size / 1000) + 128);
if (!out_buf)
return -1;
/* best compression, small window, no zlib header */
memset(&strm, 0, sizeof(strm));
ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION,
Z_DEFLATED, -12,
9, Z_DEFAULT_STRATEGY);
if (ret != 0) {
qemu_free(out_buf);
return -1;
}
strm.avail_in = s->cluster_size;
strm.next_in = (uint8_t *)buf;
strm.avail_out = s->cluster_size;
strm.next_out = out_buf;
ret = deflate(&strm, Z_FINISH);
if (ret != Z_STREAM_END && ret != Z_OK) {
qemu_free(out_buf);
deflateEnd(&strm);
return -1;
}
out_len = strm.next_out - out_buf;
deflateEnd(&strm);
if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
/* 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,
out_len, 0, 0);
cluster_offset &= s->cluster_offset_mask;
lseek64(s->fd, cluster_offset, SEEK_SET);
if (write(s->fd, out_buf, out_len) != out_len) {
qemu_free(out_buf);
return -1;
}
}
qemu_free(out_buf);
return 0;
}
BlockDriver bdrv_qcow = {
"qcow",
sizeof(BDRVQcowState),
qcow_probe,
qcow_open,
qcow_read,
qcow_write,
qcow_close,
qcow_create,
qcow_is_allocated,
qcow_set_key,
};

278
block-vmdk.c Normal file
View File

@ -0,0 +1,278 @@
/*
* Block driver for the VMDK format
*
* Copyright (c) 2004 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
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vl.h"
#include "block_int.h"
/* XXX: this code is untested */
/* XXX: add write support */
#define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D')
#define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V')
typedef struct {
uint32_t version;
uint32_t flags;
uint32_t disk_sectors;
uint32_t granularity;
uint32_t l1dir_offset;
uint32_t l1dir_size;
uint32_t file_sectors;
uint32_t cylinders;
uint32_t heads;
uint32_t sectors_per_track;
} VMDK3Header;
typedef struct {
uint32_t version;
uint32_t flags;
int64_t capacity;
int64_t granularity;
int64_t desc_offset;
int64_t desc_size;
int32_t num_gtes_per_gte;
int64_t rgd_offset;
int64_t gd_offset;
int64_t grain_offset;
char filler[1];
char check_bytes[4];
} VMDK4Header;
#define L2_CACHE_SIZE 16
typedef struct BDRVVmdkState {
int fd;
int64_t l1_table_offset;
uint32_t *l1_table;
unsigned int l1_size;
uint32_t l1_entry_sectors;
unsigned int l2_size;
uint32_t *l2_cache;
uint32_t l2_cache_offsets[L2_CACHE_SIZE];
uint32_t l2_cache_counts[L2_CACHE_SIZE];
unsigned int cluster_sectors;
} BDRVVmdkState;
static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename)
{
uint32_t magic;
if (buf_size < 4)
return 0;
magic = be32_to_cpu(*(uint32_t *)buf);
if (magic == VMDK3_MAGIC ||
magic == VMDK4_MAGIC)
return 100;
else
return 0;
}
static int vmdk_open(BlockDriverState *bs, const char *filename)
{
BDRVVmdkState *s = bs->opaque;
int fd, i;
uint32_t magic;
int l1_size;
fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
if (fd < 0)
return -1;
if (read(fd, &magic, sizeof(magic)) != sizeof(magic))
goto fail;
magic = le32_to_cpu(magic);
if (magic == VMDK3_MAGIC) {
VMDK3Header header;
if (read(fd, &header, sizeof(header)) !=
sizeof(header))
goto fail;
s->cluster_sectors = le32_to_cpu(header.granularity);
s->l2_size = 1 << 9;
s->l1_size = 1 << 6;
bs->total_sectors = le32_to_cpu(header.disk_sectors);
s->l1_table_offset = le32_to_cpu(header.l1dir_offset) * 512;
s->l1_entry_sectors = s->l2_size * s->cluster_sectors;
} else if (magic == VMDK4_MAGIC) {
VMDK4Header header;
if (read(fd, &header, sizeof(header)) != sizeof(header))
goto fail;
bs->total_sectors = le32_to_cpu(header.capacity);
s->cluster_sectors = le32_to_cpu(header.granularity);
s->l2_size = le32_to_cpu(header.num_gtes_per_gte);
s->l1_entry_sectors = s->l2_size * s->cluster_sectors;
if (s->l1_entry_sectors <= 0)
goto fail;
s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1)
/ s->l1_entry_sectors;
s->l1_table_offset = le64_to_cpu(header.rgd_offset) * 512;
} else {
goto fail;
}
/* read the L1 table */
l1_size = s->l1_size * sizeof(uint32_t);
s->l1_table = qemu_malloc(l1_size);
if (!s->l1_table)
goto fail;
if (read(s->fd, s->l1_table, l1_size) != l1_size)
goto fail;
for(i = 0; i < s->l1_size; i++) {
le32_to_cpus(&s->l1_table[i]);
}
s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
if (!s->l2_cache)
goto fail;
s->fd = fd;
/* XXX: currently only read only */
bs->read_only = 1;
return 0;
fail:
qemu_free(s->l1_table);
qemu_free(s->l2_cache);
close(fd);
return -1;
}
static uint64_t get_cluster_offset(BlockDriverState *bs,
uint64_t offset)
{
BDRVVmdkState *s = bs->opaque;
unsigned int l1_index, l2_offset, l2_index;
int min_index, i, j;
uint32_t min_count, *l2_table;
uint64_t cluster_offset;
l1_index = (offset >> 9) / s->l1_entry_sectors;
if (l1_index >= s->l1_size)
return 0;
l2_offset = s->l1_table[l1_index];
if (!l2_offset)
return 0;
for(i = 0; i < L2_CACHE_SIZE; i++) {
if (l2_offset == s->l2_cache_offsets[i]) {
/* increment the hit count */
if (++s->l2_cache_counts[i] == 0xffffffff) {
for(j = 0; j < L2_CACHE_SIZE; j++) {
s->l2_cache_counts[j] >>= 1;
}
}
l2_table = s->l2_cache + (i * s->l2_size);
goto found;
}
}
/* not found: load a new entry in the least used one */
min_index = 0;
min_count = 0xffffffff;
for(i = 0; i < L2_CACHE_SIZE; i++) {
if (s->l2_cache_counts[i] < min_count) {
min_count = s->l2_cache_counts[i];
min_index = i;
}
}
l2_table = s->l2_cache + (min_index * s->l2_size);
lseek(s->fd, (int64_t)l2_offset * 512, SEEK_SET);
if (read(s->fd, l2_table, s->l2_size * sizeof(uint32_t)) !=
s->l2_size * sizeof(uint32_t))
return 0;
s->l2_cache_offsets[min_index] = l2_offset;
s->l2_cache_counts[min_index] = 1;
found:
l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size;
cluster_offset = le32_to_cpu(l2_table[l2_index]);
cluster_offset <<= 9;
return cluster_offset;
}
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum)
{
BDRVVmdkState *s = bs->opaque;
int index_in_cluster, n;
uint64_t cluster_offset;
cluster_offset = get_cluster_offset(bs, sector_num << 9);
index_in_cluster = sector_num % s->cluster_sectors;
n = s->cluster_sectors - index_in_cluster;
if (n > nb_sectors)
n = nb_sectors;
*pnum = n;
return (cluster_offset != 0);
}
static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
BDRVVmdkState *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);
index_in_cluster = sector_num % s->cluster_sectors;
n = s->cluster_sectors - index_in_cluster;
if (n > nb_sectors)
n = nb_sectors;
if (!cluster_offset) {
memset(buf, 0, 512 * n);
} else {
lseek64(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET);
ret = read(s->fd, buf, n * 512);
if (ret != n * 512)
return -1;
}
nb_sectors -= n;
sector_num += n;
buf += n * 512;
}
return 0;
}
static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
return -1;
}
static int vmdk_close(BlockDriverState *bs)
{
BDRVVmdkState *s = bs->opaque;
qemu_free(s->l1_table);
qemu_free(s->l2_cache);
close(s->fd);
}
BlockDriver bdrv_vmdk = {
"vmdk",
sizeof(BDRVVmdkState),
vmdk_probe,
vmdk_open,
vmdk_read,
vmdk_write,
vmdk_close,
NULL, /* no create yet */
vmdk_is_allocated,
};

587
block.c
View File

@ -22,43 +22,16 @@
* THE SOFTWARE.
*/
#include "vl.h"
#ifndef _WIN32
#include <sys/mman.h>
#endif
#include "cow.h"
struct BlockDriverState {
int fd; /* if -1, only COW mappings */
int64_t total_sectors;
int read_only; /* if true, the media is read only */
int inserted; /* if true, the media is present */
int removable; /* if true, the media can be removed */
int locked; /* if true, the media cannot temporarily be ejected */
/* event callback when inserting/removing */
void (*change_cb)(void *opaque);
void *change_opaque;
uint8_t *cow_bitmap; /* if non NULL, COW mappings are used first */
uint8_t *cow_bitmap_addr; /* mmap address of cow_bitmap */
int cow_bitmap_size;
int cow_fd;
int64_t cow_sectors_offset;
int boot_sector_enabled;
uint8_t boot_sector_data[512];
char filename[1024];
/* NOTE: the following infos are only hints for real hardware
drivers. They are not used by the block driver */
int cyls, heads, secs;
int type;
char device_name[32];
BlockDriverState *next;
};
#include "block_int.h"
static BlockDriverState *bdrv_first;
static BlockDriver *first_drv;
void bdrv_register(BlockDriver *bdrv)
{
bdrv->next = first_drv;
first_drv = bdrv;
}
/* create a new block device (by default it is empty) */
BlockDriverState *bdrv_new(const char *device_name)
@ -69,125 +42,148 @@ BlockDriverState *bdrv_new(const char *device_name)
if(!bs)
return NULL;
pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
if (device_name[0] != '\0') {
/* insert at the end */
pbs = &bdrv_first;
while (*pbs != NULL)
pbs = &(*pbs)->next;
*pbs = bs;
}
return bs;
}
BlockDriver *bdrv_find_format(const char *format_name)
{
BlockDriver *drv1;
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
if (!strcmp(drv1->format_name, format_name))
return drv1;
}
return NULL;
}
int bdrv_create(BlockDriver *drv,
const char *filename, int64_t size_in_sectors,
const char *backing_file, int flags)
{
if (!drv->bdrv_create)
return -ENOTSUP;
return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
}
/* XXX: race condition possible */
static void get_tmp_filename(char *filename, int size)
{
int fd;
pstrcpy(filename, size, "/tmp/vl.XXXXXX");
fd = mkstemp(filename);
close(fd);
}
static BlockDriver *find_image_format(const char *filename)
{
int fd, ret, score, score_max;
BlockDriver *drv1, *drv;
uint8_t buf[1024];
fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
if (fd < 0)
return NULL;
ret = read(fd, buf, sizeof(buf));
if (ret < 0) {
close(fd);
return NULL;
}
close(fd);
drv = NULL;
score_max = 0;
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
score = drv1->bdrv_probe(buf, ret, filename);
if (score > score_max) {
score_max = score;
drv = drv1;
}
}
return drv;
}
int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot)
{
int fd;
int64_t size;
struct cow_header_v2 cow_header;
#ifndef _WIN32
char template[] = "/tmp/vl.XXXXXX";
int cow_fd;
struct stat st;
#endif
return bdrv_open2(bs, filename, snapshot, NULL);
}
int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
BlockDriver *drv)
{
int ret;
char tmp_filename[1024];
bs->read_only = 0;
bs->fd = -1;
bs->cow_fd = -1;
bs->cow_bitmap = NULL;
pstrcpy(bs->filename, sizeof(bs->filename), filename);
bs->is_temporary = 0;
bs->encrypted = 0;
/* open standard HD image */
#ifdef _WIN32
fd = open(filename, O_RDWR | O_BINARY);
#else
fd = open(filename, O_RDWR | O_LARGEFILE);
#endif
if (fd < 0) {
/* read only image on disk */
#ifdef _WIN32
fd = open(filename, O_RDONLY | O_BINARY);
#else
fd = open(filename, O_RDONLY | O_LARGEFILE);
#endif
if (fd < 0) {
perror(filename);
goto fail;
}
if (!snapshot)
bs->read_only = 1;
}
bs->fd = fd;
/* see if it is a cow image */
if (read(fd, &cow_header, sizeof(cow_header)) != sizeof(cow_header)) {
fprintf(stderr, "%s: could not read header\n", filename);
goto fail;
}
#ifndef _WIN32
if (be32_to_cpu(cow_header.magic) == COW_MAGIC &&
be32_to_cpu(cow_header.version) == COW_VERSION) {
/* cow image found */
size = cow_header.size;
#ifndef WORDS_BIGENDIAN
size = bswap64(size);
#endif
bs->total_sectors = size / 512;
bs->cow_fd = fd;
bs->fd = -1;
if (cow_header.backing_file[0] != '\0') {
if (stat(cow_header.backing_file, &st) != 0) {
fprintf(stderr, "%s: could not find original disk image '%s'\n", filename, cow_header.backing_file);
goto fail;
}
if (st.st_mtime != be32_to_cpu(cow_header.mtime)) {
fprintf(stderr, "%s: original raw disk image '%s' does not match saved timestamp\n", filename, cow_header.backing_file);
goto fail;
}
fd = open(cow_header.backing_file, O_RDONLY | O_LARGEFILE);
if (fd < 0)
goto fail;
bs->fd = fd;
}
/* mmap the bitmap */
bs->cow_bitmap_size = ((bs->total_sectors + 7) >> 3) + sizeof(cow_header);
bs->cow_bitmap_addr = mmap(get_mmap_addr(bs->cow_bitmap_size),
bs->cow_bitmap_size,
PROT_READ | PROT_WRITE,
MAP_SHARED, bs->cow_fd, 0);
if (bs->cow_bitmap_addr == MAP_FAILED)
goto fail;
bs->cow_bitmap = bs->cow_bitmap_addr + sizeof(cow_header);
bs->cow_sectors_offset = (bs->cow_bitmap_size + 511) & ~511;
snapshot = 0;
} else
#endif
{
/* standard raw image */
size = lseek64(fd, 0, SEEK_END);
bs->total_sectors = size / 512;
bs->fd = fd;
}
#ifndef _WIN32
if (snapshot) {
/* create a temporary COW file */
cow_fd = mkstemp64(template);
if (cow_fd < 0)
goto fail;
bs->cow_fd = cow_fd;
unlink(template);
BlockDriverState *bs1;
int64_t total_size;
/* just need to allocate bitmap */
bs->cow_bitmap_size = (bs->total_sectors + 7) >> 3;
bs->cow_bitmap_addr = mmap(get_mmap_addr(bs->cow_bitmap_size),
bs->cow_bitmap_size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (bs->cow_bitmap_addr == MAP_FAILED)
goto fail;
bs->cow_bitmap = bs->cow_bitmap_addr;
bs->cow_sectors_offset = 0;
/* if snapshot, we create a temporary backing file and open it
instead of opening 'filename' directly */
/* if there is a backing file, use it */
bs1 = bdrv_new("");
if (!bs1) {
return -1;
}
if (bdrv_open(bs1, filename, 0) < 0) {
bdrv_delete(bs1);
return -1;
}
total_size = bs1->total_sectors;
bdrv_delete(bs1);
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
/* XXX: use cow for linux as it is more efficient ? */
if (bdrv_create(&bdrv_qcow, tmp_filename,
total_size, filename, 0) < 0) {
return -1;
}
filename = tmp_filename;
bs->is_temporary = 1;
}
pstrcpy(bs->filename, sizeof(bs->filename), filename);
if (!drv) {
drv = find_image_format(filename);
if (!drv)
return -1;
}
bs->drv = drv;
bs->opaque = qemu_mallocz(drv->instance_size);
if (bs->opaque == NULL && drv->instance_size > 0)
return -1;
ret = drv->bdrv_open(bs, filename);
if (ret < 0) {
qemu_free(bs->opaque);
return -1;
}
#ifndef _WIN32
if (bs->is_temporary) {
unlink(filename);
}
#endif
if (bs->backing_file[0] != '\0' && drv->bdrv_is_allocated) {
/* if there is a backing file, use it */
bs->backing_hd = bdrv_new("");
if (!bs->backing_hd) {
fail:
bdrv_close(bs);
return -1;
}
if (bdrv_open(bs->backing_hd, bs->backing_file, 0) < 0)
goto fail;
}
bs->inserted = 1;
@ -196,23 +192,22 @@ int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot)
bs->change_cb(bs->change_opaque);
return 0;
fail:
bdrv_close(bs);
return -1;
}
void bdrv_close(BlockDriverState *bs)
{
if (bs->inserted) {
#ifndef _WIN32
/* we unmap the mapping so that it is written to the COW file */
if (bs->cow_bitmap_addr)
munmap(bs->cow_bitmap_addr, bs->cow_bitmap_size);
if (bs->backing_hd)
bdrv_delete(bs->backing_hd);
bs->drv->bdrv_close(bs);
qemu_free(bs->opaque);
#ifdef _WIN32
if (bs->is_temporary) {
unlink(bs->filename);
}
#endif
if (bs->cow_fd >= 0)
close(bs->cow_fd);
if (bs->fd >= 0)
close(bs->fd);
bs->opaque = NULL;
bs->drv = NULL;
bs->inserted = 0;
/* call the change callback */
@ -223,85 +218,45 @@ void bdrv_close(BlockDriverState *bs)
void bdrv_delete(BlockDriverState *bs)
{
/* XXX: remove the driver list */
bdrv_close(bs);
qemu_free(bs);
}
static inline void set_bit(uint8_t *bitmap, int64_t bitnum)
{
bitmap[bitnum / 8] |= (1 << (bitnum%8));
}
static inline int is_bit_set(const uint8_t *bitmap, int64_t bitnum)
{
return !!(bitmap[bitnum / 8] & (1 << (bitnum%8)));
}
/* Return true if first block has been changed (ie. current version is
* in COW file). Set the number of continuous blocks for which that
* is true. */
static int is_changed(uint8_t *bitmap,
int64_t sector_num, int nb_sectors,
int *num_same)
{
int changed;
if (!bitmap || nb_sectors == 0) {
*num_same = nb_sectors;
return 0;
}
changed = is_bit_set(bitmap, sector_num);
for (*num_same = 1; *num_same < nb_sectors; (*num_same)++) {
if (is_bit_set(bitmap, sector_num + *num_same) != changed)
break;
}
return changed;
}
/* commit COW file into the raw image */
int bdrv_commit(BlockDriverState *bs)
{
int64_t i;
uint8_t *cow_bitmap;
int n, j;
unsigned char sector[512];
if (!bs->inserted)
return -1;
if (!bs->cow_bitmap) {
fprintf(stderr, "Already committed to %s\n", bs->filename);
return 0;
}
return -ENOENT;
if (bs->read_only) {
fprintf(stderr, "Can't commit to %s: read-only\n", bs->filename);
return -1;
return -EACCES;
}
cow_bitmap = bs->cow_bitmap;
for (i = 0; i < bs->total_sectors; i++) {
if (is_bit_set(cow_bitmap, i)) {
unsigned char sector[512];
if (!bs->backing_hd) {
return -ENOTSUP;
}
for (i = 0; i < bs->total_sectors;) {
if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) {
for(j = 0; j < n; j++) {
if (bdrv_read(bs, i, sector, 1) != 0) {
fprintf(stderr, "Error reading sector %lli: aborting commit\n",
(long long)i);
return -1;
return -EIO;
}
/* Make bdrv_write write to real file for a moment. */
bs->cow_bitmap = NULL;
if (bdrv_write(bs, i, sector, 1) != 0) {
fprintf(stderr, "Error writing sector %lli: aborting commit\n",
(long long)i);
bs->cow_bitmap = cow_bitmap;
return -1;
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
return -EIO;
}
bs->cow_bitmap = cow_bitmap;
i++;
}
} else {
i += n;
}
}
fprintf(stderr, "Committed snapshot to %s\n", bs->filename);
return 0;
}
@ -309,37 +264,34 @@ int bdrv_commit(BlockDriverState *bs)
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret, n, fd;
int64_t offset;
int ret, n;
BlockDriver *drv = bs->drv;
if (!bs->inserted)
return -1;
while (nb_sectors > 0) {
if (is_changed(bs->cow_bitmap, sector_num, nb_sectors, &n)) {
fd = bs->cow_fd;
offset = bs->cow_sectors_offset;
} else if (sector_num == 0 && bs->boot_sector_enabled) {
if (sector_num == 0 && bs->boot_sector_enabled) {
memcpy(buf, bs->boot_sector_data, 512);
n = 1;
goto next;
} else if (bs->backing_hd) {
if (drv->bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) {
ret = drv->bdrv_read(bs, sector_num, buf, n);
if (ret < 0)
return -1;
} else {
fd = bs->fd;
offset = 0;
}
if (fd < 0) {
/* no file, just return empty sectors */
memset(buf, 0, n * 512);
} else {
offset += sector_num * 512;
lseek64(fd, offset, SEEK_SET);
ret = read(fd, buf, n * 512);
if (ret != n * 512) {
/* read from the base image */
ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
if (ret < 0)
return -1;
}
} else {
ret = drv->bdrv_read(bs, sector_num, buf, nb_sectors);
if (ret < 0)
return -1;
/* no need to loop */
break;
}
next:
nb_sectors -= n;
sector_num += n;
buf += n * 512;
@ -351,37 +303,11 @@ int bdrv_read(BlockDriverState *bs, int64_t sector_num,
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
int ret, fd, i;
int64_t offset, retl;
if (!bs->inserted)
return -1;
if (bs->read_only)
return -1;
if (bs->cow_bitmap) {
fd = bs->cow_fd;
offset = bs->cow_sectors_offset;
} else {
fd = bs->fd;
offset = 0;
}
offset += sector_num * 512;
retl = lseek64(fd, offset, SEEK_SET);
if (retl == -1) {
return -1;
}
ret = write(fd, buf, nb_sectors * 512);
if (ret != nb_sectors * 512) {
return -1;
}
if (bs->cow_bitmap) {
for (i = 0; i < nb_sectors; i++)
set_bit(bs->cow_bitmap, sector_num + i);
}
return 0;
return bs->drv->bdrv_write(bs, sector_num, buf, nb_sectors);
}
void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
@ -459,6 +385,47 @@ void bdrv_set_change_cb(BlockDriverState *bs,
bs->change_opaque = opaque;
}
int bdrv_is_encrypted(BlockDriverState *bs)
{
if (bs->backing_hd && bs->backing_hd->encrypted)
return 1;
return bs->encrypted;
}
int bdrv_set_key(BlockDriverState *bs, const char *key)
{
int ret;
if (bs->backing_hd && bs->backing_hd->encrypted) {
ret = bdrv_set_key(bs->backing_hd, key);
if (ret < 0)
return ret;
if (!bs->encrypted)
return 0;
}
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
return -1;
return bs->drv->bdrv_set_key(bs, key);
}
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
{
if (!bs->inserted || !bs->drv) {
buf[0] = '\0';
} else {
pstrcpy(buf, buf_size, bs->drv->format_name);
}
}
void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
void *opaque)
{
BlockDriver *drv;
for (drv = first_drv; drv != NULL; drv = drv->next) {
it(opaque, drv->format_name);
}
}
BlockDriverState *bdrv_find(const char *name)
{
BlockDriverState *bs;
@ -479,6 +446,11 @@ void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
}
}
const char *bdrv_get_device_name(BlockDriverState *bs)
{
return bs->device_name;
}
void bdrv_info(void)
{
BlockDriverState *bs;
@ -503,10 +475,117 @@ void bdrv_info(void)
}
if (bs->inserted) {
term_printf(" file=%s", bs->filename);
if (bs->backing_file[0] != '\0')
term_printf(" backing_file=%s", bs->backing_file);
term_printf(" ro=%d", bs->read_only);
term_printf(" drv=%s", bs->drv->format_name);
if (bs->encrypted)
term_printf(" encrypted");
} else {
term_printf(" [not inserted]");
}
term_printf("\n");
}
}
/**************************************************************/
/* RAW block driver */
typedef struct BDRVRawState {
int fd;
} BDRVRawState;
static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
{
return 1; /* maybe */
}
static int raw_open(BlockDriverState *bs, const char *filename)
{
BDRVRawState *s = bs->opaque;
int fd;
int64_t size;
fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
if (fd < 0) {
fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
if (fd < 0)
return -1;
bs->read_only = 1;
}
size = lseek64(fd, 0, SEEK_END);
bs->total_sectors = size / 512;
s->fd = fd;
return 0;
}
static int raw_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
BDRVRawState *s = bs->opaque;
int ret;
lseek64(s->fd, sector_num * 512, SEEK_SET);
ret = read(s->fd, buf, nb_sectors * 512);
if (ret != nb_sectors * 512)
return -1;
return 0;
}
static int raw_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
BDRVRawState *s = bs->opaque;
int ret;
lseek64(s->fd, sector_num * 512, SEEK_SET);
ret = write(s->fd, buf, nb_sectors * 512);
if (ret != nb_sectors * 512)
return -1;
return 0;
}
static int raw_close(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
close(s->fd);
}
static int raw_create(const char *filename, int64_t total_size,
const char *backing_file, int flags)
{
int fd;
if (flags || backing_file)
return -ENOTSUP;
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
0644);
if (fd < 0)
return -EIO;
ftruncate64(fd, total_size * 512);
close(fd);
return 0;
}
BlockDriver bdrv_raw = {
"raw",
sizeof(BDRVRawState),
raw_probe,
raw_open,
raw_read,
raw_write,
raw_close,
raw_create,
};
void bdrv_init(void)
{
bdrv_register(&bdrv_raw);
#ifndef _WIN32
bdrv_register(&bdrv_cow);
#endif
bdrv_register(&bdrv_qcow);
bdrv_register(&bdrv_vmdk);
}

77
block_int.h Normal file
View File

@ -0,0 +1,77 @@
/*
* QEMU System Emulator block driver
*
* Copyright (c) 2003 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
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef BLOCK_INT_H
#define BLOCK_INT_H
struct BlockDriver {
const char *format_name;
int instance_size;
int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
int (*bdrv_open)(BlockDriverState *bs, const char *filename);
int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors);
int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors);
int (*bdrv_close)(BlockDriverState *bs);
int (*bdrv_create)(const char *filename, int64_t total_sectors,
const char *backing_file, int flags);
int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum);
int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
struct BlockDriver *next;
};
struct BlockDriverState {
int64_t total_sectors;
int read_only; /* if true, the media is read only */
int inserted; /* if true, the media is present */
int removable; /* if true, the media can be removed */
int locked; /* if true, the media cannot temporarily be ejected */
int encrypted; /* if true, the media is encrypted */
/* event callback when inserting/removing */
void (*change_cb)(void *opaque);
void *change_opaque;
BlockDriver *drv;
void *opaque;
int boot_sector_enabled;
uint8_t boot_sector_data[512];
char filename[1024];
char backing_file[1024]; /* if non zero, the image is a diff of
this file image */
int is_temporary;
BlockDriverState *backing_hd;
/* NOTE: the following infos are only hints for real hardware
drivers. They are not used by the block driver */
int cyls, heads, secs;
int type;
char device_name[32];
BlockDriverState *next;
};
#endif /* BLOCK_INT_H */

677
qemu-img.c Normal file
View File

@ -0,0 +1,677 @@
/*
* create a COW disk image
*
* Copyright (c) 2003 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
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vl.h"
void *get_mmap_addr(unsigned long size)
{
return NULL;
}
void qemu_free(void *ptr)
{
free(ptr);
}
void *qemu_malloc(size_t size)
{
return malloc(size);
}
void *qemu_mallocz(size_t size)
{
void *ptr;
ptr = qemu_malloc(size);
if (!ptr)
return NULL;
memset(ptr, 0, size);
return ptr;
}
char *qemu_strdup(const char *str)
{
char *ptr;
ptr = qemu_malloc(strlen(str) + 1);
if (!ptr)
return NULL;
strcpy(ptr, str);
return ptr;
}
void pstrcpy(char *buf, int buf_size, const char *str)
{
int c;
char *q = buf;
if (buf_size <= 0)
return;
for(;;) {
c = *str++;
if (c == 0 || q >= buf + buf_size - 1)
break;
*q++ = c;
}
*q = '\0';
}
/* strcat and truncate. */
char *pstrcat(char *buf, int buf_size, const char *s)
{
int len;
len = strlen(buf);
if (len < buf_size)
pstrcpy(buf + len, buf_size - len, s);
return buf;
}
int strstart(const char *str, const char *val, const char **ptr)
{
const char *p, *q;
p = str;
q = val;
while (*q != '\0') {
if (*p != *q)
return 0;
p++;
q++;
}
if (ptr)
*ptr = p;
return 1;
}
void term_printf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
}
void __attribute__((noreturn)) error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "qemuimg: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
exit(1);
va_end(ap);
}
static void format_print(void *opaque, const char *name)
{
printf(" %s", name);
}
void help(void)
{
printf("qemuimg version " QEMU_VERSION ", Copyright (c) 2004 Fabrice Bellard\n"
"usage: qemuimg command [command options]\n"
"QEMU disk image utility\n"
"\n"
"Command syntax:\n"
" create [-e] [-b base_image] [-f fmt] filename [size]\n"
" commit [-f fmt] filename\n"
" convert [-c] [-e] [-f fmt] filename [-O output_fmt] output_filename\n"
" info [-f fmt] filename\n"
"\n"
"Command parameters:\n"
" 'filename' is a disk image filename\n"
" 'base_image' is the read-only disk image which is used as base for a copy on\n"
" write image; the copy on write image only stores the modified data\n"
" 'fmt' is the disk image format. It is guessed automatically in most cases\n"
" 'size' is the disk image size in kilobytes. Optional suffixes 'M' (megabyte)\n"
" and 'G' (gigabyte) are supported\n"
" 'output_filename' is the destination disk image filename\n"
" 'output_fmt' is the destination format\n"
" '-c' indicates that target image must be compressed (qcow format only)\n"
" '-e' indicates that the target image must be encrypted (qcow format only)\n"
);
printf("\nSupported format:");
bdrv_iterate_format(format_print, NULL);
printf("\n");
exit(1);
}
#define NB_SUFFIXES 4
static void get_human_readable_size(char *buf, int buf_size, int64_t size)
{
char suffixes[NB_SUFFIXES] = "KMGT";
int64_t base;
int i;
if (size <= 999) {
snprintf(buf, buf_size, "%lld", size);
} else {
base = 1024;
for(i = 0; i < NB_SUFFIXES; i++) {
if (size < (10 * base)) {
snprintf(buf, buf_size, "%0.1f%c",
(double)size / base,
suffixes[i]);
break;
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
snprintf(buf, buf_size, "%lld%c",
(size + (base >> 1)) / base,
suffixes[i]);
break;
}
base = base * 1024;
}
}
}
#if defined(WIN32)
/* XXX: put correct support for win32 */
static int read_password(char *buf, int buf_size)
{
int c, i;
printf("Password: ");
fflush(stdout);
i = 0;
for(;;) {
c = getchar();
if (c == '\n')
break;
if (i < (buf_size - 1))
buf[i++] = c;
}
buf[i] = '\0';
return 0;
}
#else
#include <termios.h>
static struct termios oldtty;
static void term_exit(void)
{
tcsetattr (0, TCSANOW, &oldtty);
}
static void term_init(void)
{
struct termios tty;
tcgetattr (0, &tty);
oldtty = tty;
tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
|INLCR|IGNCR|ICRNL|IXON);
tty.c_oflag |= OPOST;
tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
tty.c_cflag &= ~(CSIZE|PARENB);
tty.c_cflag |= CS8;
tty.c_cc[VMIN] = 1;
tty.c_cc[VTIME] = 0;
tcsetattr (0, TCSANOW, &tty);
atexit(term_exit);
}
int read_password(char *buf, int buf_size)
{
uint8_t ch;
int i, ret;
printf("password: ");
fflush(stdout);
term_init();
i = 0;
for(;;) {
ret = read(0, &ch, 1);
if (ret == -1) {
if (errno == EAGAIN || errno == EINTR) {
continue;
} else {
ret = -1;
break;
}
} else if (ret == 0) {
ret = -1;
break;
} else {
if (ch == '\r') {
ret = 0;
break;
}
if (i < (buf_size - 1))
buf[i++] = ch;
}
}
term_exit();
buf[i] = '\0';
printf("\n");
return ret;
}
#endif
static int img_create(int argc, char **argv)
{
int c, ret, encrypted;
const char *fmt = "raw";
const char *filename;
const char *base_filename = NULL;
int64_t size;
const char *p;
BlockDriver *drv;
encrypted = 0;
for(;;) {
c = getopt(argc, argv, "b:f:he");
if (c == -1)
break;
switch(c) {
case 'h':
help();
break;
case 'b':
base_filename = optarg;
break;
case 'f':
fmt = optarg;
break;
case 'e':
encrypted = 1;
break;
}
}
optind++;
if (optind >= argc)
help();
filename = argv[optind++];
size = 0;
if (!base_filename) {
if (optind >= argc)
help();
p = argv[optind];
size = strtoul(p, (char **)&p, 0);
if (*p == 'M') {
size *= 1024 * 1024;
} else if (*p == 'G') {
size *= 1024 * 1024 * 1024;
} else if (*p == 'k' || *p == 'K' || *p == '\0') {
size *= 1024;
} else {
help();
}
}
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
printf("Formating '%s', fmt=%s",
filename, fmt);
if (encrypted)
printf(", encrypted");
if (base_filename)
printf(", backing_file=%s\n",
base_filename);
else
printf(", size=%lld kB\n", size / 1024);
ret = bdrv_create(drv, filename, size / 512, base_filename, encrypted);
if (ret < 0) {
if (ret == -ENOTSUP) {
error("Formatting or formatting option not suppored for file format '%s'", fmt);
} else {
error("Error while formatting");
}
}
return 0;
}
static int img_commit(int argc, char **argv)
{
int c, ret;
const char *filename, *fmt;
BlockDriver *drv;
BlockDriverState *bs;
fmt = NULL;
for(;;) {
c = getopt(argc, argv, "f:h");
if (c == -1)
break;
switch(c) {
case 'h':
help();
break;
case 'f':
fmt = optarg;
break;
}
}
optind++;
if (optind >= argc)
help();
filename = argv[optind++];
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (fmt) {
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
} else {
drv = NULL;
}
if (bdrv_open2(bs, filename, 0, drv) < 0) {
error("Could not open '%s'", filename);
}
ret = bdrv_commit(bs);
switch(ret) {
case 0:
printf("Image committed.\n");
break;
case -ENOENT:
error("No disk inserted");
break;
case -EACCES:
error("Image is read-only");
break;
case -ENOTSUP:
error("Image is already committed");
break;
default:
error("Error while committing image");
break;
}
bdrv_delete(bs);
return 0;
}
static int is_not_zero(const uint8_t *sector, int len)
{
int i;
len >>= 2;
for(i = 0;i < len; i++) {
if (((uint32_t *)sector)[i] != 0)
return 1;
}
return 0;
}
static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum)
{
int v, i;
if (n <= 0) {
*pnum = 0;
return 0;
}
v = is_not_zero(buf, 512);
for(i = 1; i < n; i++) {
buf += 512;
if (v != is_not_zero(buf, 512))
break;
}
*pnum = i;
return v;
}
static BlockDriverState *bdrv_new_open(const char *filename,
const char *fmt)
{
BlockDriverState *bs;
BlockDriver *drv;
char password[256];
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (fmt) {
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
} else {
drv = NULL;
}
if (bdrv_open2(bs, filename, 0, drv) < 0) {
error("Could not open '%s'", filename);
}
if (bdrv_is_encrypted(bs)) {
printf("Disk image '%s' is encrypted.\n", filename);
if (read_password(password, sizeof(password)) < 0)
error("No password given");
if (bdrv_set_key(bs, password) < 0)
error("invalid password");
}
return bs;
}
#define IO_BUF_SIZE 65536
static int img_convert(int argc, char **argv)
{
int c, ret, n, n1, compress, cluster_size, cluster_sectors, encrypt;
const char *filename, *fmt, *out_fmt, *out_filename;
BlockDriver *drv;
BlockDriverState *bs, *out_bs;
int64_t total_sectors, nb_sectors, sector_num;
uint8_t buf[IO_BUF_SIZE];
const uint8_t *buf1;
fmt = NULL;
out_fmt = "raw";
compress = 0;
encrypt = 0;
for(;;) {
c = getopt(argc, argv, "f:O:hce");
if (c == -1)
break;
switch(c) {
case 'h':
help();
break;
case 'f':
fmt = optarg;
break;
case 'O':
out_fmt = optarg;
break;
case 'c':
compress = 1;
break;
case 'e':
encrypt = 1;
break;
}
}
optind++;
if (optind >= argc)
help();
filename = argv[optind++];
if (optind >= argc)
help();
out_filename = argv[optind++];
bs = bdrv_new_open(filename, fmt);
drv = bdrv_find_format(out_fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
if (compress && drv != &bdrv_qcow)
error("Compression not supported for this file format");
if (encrypt && drv != &bdrv_qcow)
error("Encryption not supported for this file format");
if (compress && encrypt)
error("Compression and encryption not supported at the same time");
bdrv_get_geometry(bs, &total_sectors);
ret = bdrv_create(drv, out_filename, total_sectors, NULL, encrypt);
if (ret < 0) {
if (ret == -ENOTSUP) {
error("Formatting not suppored for file format '%s'", fmt);
} else {
error("Error while formatting '%s'", out_filename);
}
}
out_bs = bdrv_new_open(out_filename, out_fmt);
if (compress) {
cluster_size = qcow_get_cluster_size(out_bs);
if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE)
error("invalid cluster size");
cluster_sectors = cluster_size >> 9;
sector_num = 0;
for(;;) {
nb_sectors = total_sectors - sector_num;
if (nb_sectors <= 0)
break;
if (nb_sectors >= cluster_sectors)
n = cluster_sectors;
else
n = nb_sectors;
if (bdrv_read(bs, sector_num, buf, n) < 0)
error("error while reading");
if (n < cluster_sectors)
memset(buf + n * 512, 0, cluster_size - n * 512);
if (is_not_zero(buf, cluster_size)) {
if (qcow_compress_cluster(out_bs, sector_num, buf) != 0)
error("error while compressing sector %lld", sector_num);
}
sector_num += n;
}
} else {
sector_num = 0;
for(;;) {
nb_sectors = total_sectors - sector_num;
if (nb_sectors <= 0)
break;
if (nb_sectors >= (IO_BUF_SIZE / 512))
n = (IO_BUF_SIZE / 512);
else
n = nb_sectors;
if (bdrv_read(bs, sector_num, buf, n) < 0)
error("error while reading");
/* NOTE: at the same time we convert, we do not write zero
sectors to have a chance to compress the image. Ideally, we
should add a specific call to have the info to go faster */
buf1 = buf;
while (n > 0) {
if (is_allocated_sectors(buf1, n, &n1)) {
if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
error("error while writing");
}
sector_num += n1;
n -= n1;
buf1 += n1 * 512;
}
}
}
bdrv_delete(out_bs);
bdrv_delete(bs);
return 0;
}
static int img_info(int argc, char **argv)
{
int c;
const char *filename, *fmt;
BlockDriver *drv;
BlockDriverState *bs;
char fmt_name[128], size_buf[128], dsize_buf[128];
int64_t total_sectors;
struct stat st;
fmt = NULL;
for(;;) {
c = getopt(argc, argv, "f:h");
if (c == -1)
break;
switch(c) {
case 'h':
help();
break;
case 'f':
fmt = optarg;
break;
}
}
optind++;
if (optind >= argc)
help();
filename = argv[optind++];
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (fmt) {
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
} else {
drv = NULL;
}
if (bdrv_open2(bs, filename, 0, drv) < 0) {
error("Could not open '%s'", filename);
}
bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
bdrv_get_geometry(bs, &total_sectors);
get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
if (stat(filename, &st) < 0)
error("Could not stat '%s'", filename);
get_human_readable_size(dsize_buf, sizeof(dsize_buf),
(int64_t)st.st_blocks * 512);
printf("image: %s\n"
"file format: %s\n"
"virtual size: %s (%lld bytes)\n"
"disk size: %s\n",
filename, fmt_name, size_buf,
total_sectors * 512,
dsize_buf);
if (bdrv_is_encrypted(bs))
printf("encrypted: yes\n");
bdrv_delete(bs);
return 0;
}
int main(int argc, char **argv)
{
const char *cmd;
bdrv_init();
if (argc < 2)
help();
cmd = argv[1];
if (!strcmp(cmd, "create")) {
img_create(argc, argv);
} else if (!strcmp(cmd, "commit")) {
img_commit(argc, argv);
} else if (!strcmp(cmd, "convert")) {
img_convert(argc, argv);
} else if (!strcmp(cmd, "info")) {
img_info(argc, argv);
} else {
help();
}
return 0;
}

207
vl.h
View File

@ -48,8 +48,21 @@
#define lseek64 _lseeki64
#endif
#ifdef QEMU_TOOL
/* we use QEMU_TOOL in the command line tools which do not depend on
the target CPU type */
#include "config-host.h"
#include <setjmp.h>
#include "osdep.h"
#include "bswap.h"
#else
#include "cpu.h"
#endif /* !defined(QEMU_TOOL) */
#ifndef glue
#define xglue(x, y) x ## y
#define glue(x, y) xglue(x, y)
@ -57,153 +70,6 @@
#define tostring(s) #s
#endif
#if defined(WORDS_BIGENDIAN)
static inline uint32_t be32_to_cpu(uint32_t v)
{
return v;
}
static inline uint16_t be16_to_cpu(uint16_t v)
{
return v;
}
static inline uint32_t cpu_to_be32(uint32_t v)
{
return v;
}
static inline uint16_t cpu_to_be16(uint16_t v)
{
return v;
}
static inline uint32_t le32_to_cpu(uint32_t v)
{
return bswap32(v);
}
static inline uint16_t le16_to_cpu(uint16_t v)
{
return bswap16(v);
}
static inline uint32_t cpu_to_le32(uint32_t v)
{
return bswap32(v);
}
static inline uint16_t cpu_to_le16(uint16_t v)
{
return bswap16(v);
}
#else
static inline uint32_t be32_to_cpu(uint32_t v)
{
return bswap32(v);
}
static inline uint16_t be16_to_cpu(uint16_t v)
{
return bswap16(v);
}
static inline uint32_t cpu_to_be32(uint32_t v)
{
return bswap32(v);
}
static inline uint16_t cpu_to_be16(uint16_t v)
{
return bswap16(v);
}
static inline uint32_t le32_to_cpu(uint32_t v)
{
return v;
}
static inline uint16_t le16_to_cpu(uint16_t v)
{
return v;
}
static inline uint32_t cpu_to_le32(uint32_t v)
{
return v;
}
static inline uint16_t cpu_to_le16(uint16_t v)
{
return v;
}
#endif
static inline void cpu_to_le16w(uint16_t *p, uint16_t v)
{
*p = cpu_to_le16(v);
}
static inline void cpu_to_le32w(uint32_t *p, uint32_t v)
{
*p = cpu_to_le32(v);
}
static inline uint16_t le16_to_cpup(const uint16_t *p)
{
return le16_to_cpu(*p);
}
static inline uint32_t le32_to_cpup(const uint32_t *p)
{
return le32_to_cpu(*p);
}
/* unaligned versions (optimized for frequent unaligned accesses)*/
#if defined(__i386__) || defined(__powerpc__)
#define cpu_to_le16wu(p, v) cpu_to_le16w(p, v)
#define cpu_to_le32wu(p, v) cpu_to_le32w(p, v)
#define le16_to_cpupu(p) le16_to_cpup(p)
#define le32_to_cpupu(p) le32_to_cpup(p)
#else
static inline void cpu_to_le16wu(uint16_t *p, uint16_t v)
{
uint8_t *p1 = (uint8_t *)p;
p1[0] = v;
p1[1] = v >> 8;
}
static inline void cpu_to_le32wu(uint32_t *p, uint32_t v)
{
uint8_t *p1 = (uint8_t *)p;
p1[0] = v;
p1[1] = v >> 8;
p1[2] = v >> 16;
p1[3] = v >> 24;
}
static inline uint16_t le16_to_cpupu(const uint16_t *p)
{
const uint8_t *p1 = (const uint8_t *)p;
return p1[0] | (p1[1] << 8);
}
static inline uint32_t le32_to_cpupu(const uint32_t *p)
{
const uint8_t *p1 = (const uint8_t *)p;
return p1[0] | (p1[1] << 8) | (p1[2] << 16) | (p1[3] << 24);
}
#endif
/* vl.c */
uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c);
@ -233,6 +99,8 @@ void qemu_register_reset(QEMUResetHandler *func, void *opaque);
void qemu_system_reset_request(void);
void qemu_system_shutdown_request(void);
void main_loop_wait(int timeout);
extern int audio_enabled;
extern int ram_size;
extern int bios_size;
@ -301,6 +169,7 @@ void qemu_del_fd_read_handler(int fd);
/* character device */
#define CHR_EVENT_BREAK 0 /* serial break char */
#define CHR_EVENT_FOCUS 1 /* focus to this terminal (modal input needed) */
typedef void IOEventHandler(void *opaque, int event);
@ -310,11 +179,13 @@ typedef struct CharDriverState {
IOCanRWHandler *fd_can_read,
IOReadHandler *fd_read, void *opaque);
IOEventHandler *chr_event;
IOEventHandler *chr_send_event;
void *opaque;
} CharDriverState;
void qemu_chr_printf(CharDriverState *s, const char *fmt, ...);
int qemu_chr_write(CharDriverState *s, const uint8_t *buf, int len);
void qemu_chr_send_event(CharDriverState *s, int event);
void qemu_chr_add_read_handler(CharDriverState *s,
IOCanRWHandler *fd_can_read,
IOReadHandler *fd_read, void *opaque);
@ -464,10 +335,23 @@ void qemu_put_timer(QEMUFile *f, QEMUTimer *ts);
/* block.c */
typedef struct BlockDriverState BlockDriverState;
typedef struct BlockDriver BlockDriver;
extern BlockDriver bdrv_raw;
extern BlockDriver bdrv_cow;
extern BlockDriver bdrv_qcow;
extern BlockDriver bdrv_vmdk;
void bdrv_init(void);
BlockDriver *bdrv_find_format(const char *format_name);
int bdrv_create(BlockDriver *drv,
const char *filename, int64_t size_in_sectors,
const char *backing_file, int flags);
BlockDriverState *bdrv_new(const char *device_name);
void bdrv_delete(BlockDriverState *bs);
int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot);
int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
BlockDriver *drv);
void bdrv_close(BlockDriverState *bs);
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors);
@ -494,11 +378,21 @@ int bdrv_is_locked(BlockDriverState *bs);
void bdrv_set_locked(BlockDriverState *bs, int locked);
void bdrv_set_change_cb(BlockDriverState *bs,
void (*change_cb)(void *opaque), void *opaque);
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);
void bdrv_info(void);
BlockDriverState *bdrv_find(const char *name);
void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque);
int bdrv_is_encrypted(BlockDriverState *bs);
int bdrv_set_key(BlockDriverState *bs, const char *key);
void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
void *opaque);
const char *bdrv_get_device_name(BlockDriverState *bs);
int qcow_get_cluster_size(BlockDriverState *bs);
int qcow_compress_cluster(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf);
#ifndef QEMU_TOOL
/* ISA bus */
extern target_phys_addr_t isa_mem_base;
@ -823,11 +717,28 @@ void adb_mouse_init(ADBBusState *bus);
extern ADBBusState adb_bus;
int cuda_init(openpic_t *openpic, int irq);
#endif /* defined(QEMU_TOOL) */
/* monitor.c */
void monitor_init(CharDriverState *hd, int show_banner);
void term_puts(const char *str);
void term_vprintf(const char *fmt, va_list ap);
void term_printf(const char *fmt, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
void term_flush(void);
void term_print_help(void);
void monitor_readline(const char *prompt, int is_password,
char *buf, int buf_size);
/* readline.c */
typedef void ReadLineFunc(void *opaque, const char *str);
extern int completion_index;
void add_completion(const char *str);
void readline_handle_byte(int ch);
void readline_find_completion(const char *cmdline);
const char *readline_get_history(unsigned int index);
void readline_start(const char *prompt, int is_password,
ReadLineFunc *readline_func, void *opaque);
/* gdbstub.c */