mirror of
https://github.com/Motorhead1991/qemu.git
synced 2025-08-03 07:43:54 -06:00
new disk image layer
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1037 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard
parent
e4d4fe3c34
commit
ea2384d36e
7 changed files with 2383 additions and 421 deletions
625
block.c
625
block.c
|
|
@ -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)
|
||||
|
|
@ -69,126 +42,149 @@ BlockDriverState *bdrv_new(const char *device_name)
|
|||
if(!bs)
|
||||
return NULL;
|
||||
pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
|
||||
/* insert at the end */
|
||||
pbs = &bdrv_first;
|
||||
while (*pbs != NULL)
|
||||
pbs = &(*pbs)->next;
|
||||
*pbs = bs;
|
||||
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);
|
||||
}
|
||||
|
||||
bs->read_only = 0;
|
||||
bs->fd = -1;
|
||||
bs->cow_fd = -1;
|
||||
bs->cow_bitmap = NULL;
|
||||
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
||||
|
||||
/* 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);
|
||||
|
||||
/* 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;
|
||||
}
|
||||
#endif
|
||||
int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
|
||||
BlockDriver *drv)
|
||||
{
|
||||
int ret;
|
||||
char tmp_filename[1024];
|
||||
|
||||
bs->read_only = 0;
|
||||
bs->is_temporary = 0;
|
||||
bs->encrypted = 0;
|
||||
|
||||
if (snapshot) {
|
||||
BlockDriverState *bs1;
|
||||
int64_t total_size;
|
||||
|
||||
/* 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;
|
||||
|
||||
/* call the change callback */
|
||||
|
|
@ -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 (bdrv_read(bs, i, sector, 1) != 0) {
|
||||
fprintf(stderr, "Error reading sector %lli: aborting commit\n",
|
||||
(long long)i);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* 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;
|
||||
}
|
||||
bs->cow_bitmap = cow_bitmap;
|
||||
}
|
||||
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) {
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
|
||||
return -EIO;
|
||||
}
|
||||
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 {
|
||||
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) {
|
||||
return -1;
|
||||
} 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 {
|
||||
/* 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);
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue