version 1.1.1.6, 2018/04/24 16:47:23
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version 1.1.1.17, 2018/04/24 18:16:35
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Line 21
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Line 21
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
* THE SOFTWARE. |
* THE SOFTWARE. |
*/ |
*/ |
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#include "config-host.h" |
#include "qemu-common.h" |
#include "qemu-common.h" |
#ifndef QEMU_IMG |
#include "monitor.h" |
#include "console.h" |
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#endif |
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#include "block_int.h" |
#include "block_int.h" |
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#include "module.h" |
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#include "qemu-objects.h" |
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#ifdef _BSD |
#ifdef CONFIG_BSD |
#include <sys/types.h> |
#include <sys/types.h> |
#include <sys/stat.h> |
#include <sys/stat.h> |
#include <sys/ioctl.h> |
#include <sys/ioctl.h> |
#include <sys/queue.h> |
#include <sys/queue.h> |
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#ifndef __DragonFly__ |
#include <sys/disk.h> |
#include <sys/disk.h> |
#endif |
#endif |
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#endif |
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#define SECTOR_BITS 9 |
#ifdef _WIN32 |
#define SECTOR_SIZE (1 << SECTOR_BITS) |
#include <windows.h> |
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#endif |
typedef struct BlockDriverAIOCBSync { |
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BlockDriverAIOCB common; |
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QEMUBH *bh; |
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int ret; |
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} BlockDriverAIOCBSync; |
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static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
int64_t sector_num, uint8_t *buf, int nb_sectors, |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
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BlockDriverCompletionFunc *cb, void *opaque); |
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static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
BlockDriverCompletionFunc *cb, void *opaque); |
BlockDriverCompletionFunc *cb, void *opaque); |
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
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BlockDriverCompletionFunc *cb, void *opaque); |
BlockDriverCompletionFunc *cb, void *opaque); |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
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static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
uint8_t *buf, int nb_sectors); |
uint8_t *buf, int nb_sectors); |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
const uint8_t *buf, int nb_sectors); |
const uint8_t *buf, int nb_sectors); |
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BlockDriverState *bdrv_first; |
BlockDriverState *bdrv_first; |
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static BlockDriver *first_drv; |
static BlockDriver *first_drv; |
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/* If non-zero, use only whitelisted block drivers */ |
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static int use_bdrv_whitelist; |
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int path_is_absolute(const char *path) |
int path_is_absolute(const char *path) |
{ |
{ |
const char *p; |
const char *p; |
Line 123 void path_combine(char *dest, int dest_s
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Line 126 void path_combine(char *dest, int dest_s
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} |
} |
} |
} |
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void bdrv_register(BlockDriver *bdrv) |
static void bdrv_register(BlockDriver *bdrv) |
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{ |
{ |
if (!bdrv->bdrv_aio_read) { |
if (!bdrv->bdrv_aio_readv) { |
/* add AIO emulation layer */ |
/* add AIO emulation layer */ |
bdrv->bdrv_aio_read = bdrv_aio_read_em; |
bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
bdrv->bdrv_aio_write = bdrv_aio_write_em; |
bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; |
} else if (!bdrv->bdrv_read) { |
bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync); |
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} else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { |
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/* add synchronous IO emulation layer */ |
/* add synchronous IO emulation layer */ |
bdrv->bdrv_read = bdrv_read_em; |
bdrv->bdrv_read = bdrv_read_em; |
bdrv->bdrv_write = bdrv_write_em; |
bdrv->bdrv_write = bdrv_write_em; |
} |
} |
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if (!bdrv->bdrv_aio_flush) |
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bdrv->bdrv_aio_flush = bdrv_aio_flush_em; |
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bdrv->next = first_drv; |
bdrv->next = first_drv; |
first_drv = bdrv; |
first_drv = bdrv; |
} |
} |
Line 147 BlockDriverState *bdrv_new(const char *d
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Line 151 BlockDriverState *bdrv_new(const char *d
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BlockDriverState **pbs, *bs; |
BlockDriverState **pbs, *bs; |
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bs = qemu_mallocz(sizeof(BlockDriverState)); |
bs = qemu_mallocz(sizeof(BlockDriverState)); |
if(!bs) |
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return NULL; |
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pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
if (device_name[0] != '\0') { |
if (device_name[0] != '\0') { |
/* insert at the end */ |
/* insert at the end */ |
Line 170 BlockDriver *bdrv_find_format(const char
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Line 172 BlockDriver *bdrv_find_format(const char
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return NULL; |
return NULL; |
} |
} |
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int bdrv_create(BlockDriver *drv, |
static int bdrv_is_whitelisted(BlockDriver *drv) |
const char *filename, int64_t size_in_sectors, |
{ |
const char *backing_file, int flags) |
static const char *whitelist[] = { |
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CONFIG_BDRV_WHITELIST |
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}; |
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const char **p; |
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|
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if (!whitelist[0]) |
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return 1; /* no whitelist, anything goes */ |
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for (p = whitelist; *p; p++) { |
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if (!strcmp(drv->format_name, *p)) { |
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return 1; |
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} |
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} |
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return 0; |
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} |
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BlockDriver *bdrv_find_whitelisted_format(const char *format_name) |
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{ |
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BlockDriver *drv = bdrv_find_format(format_name); |
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return drv && bdrv_is_whitelisted(drv) ? drv : NULL; |
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} |
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int bdrv_create(BlockDriver *drv, const char* filename, |
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QEMUOptionParameter *options) |
{ |
{ |
if (!drv->bdrv_create) |
if (!drv->bdrv_create) |
return -ENOTSUP; |
return -ENOTSUP; |
return drv->bdrv_create(filename, size_in_sectors, backing_file, flags); |
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return drv->bdrv_create(filename, options); |
} |
} |
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#ifdef _WIN32 |
#ifdef _WIN32 |
Line 191 void get_tmp_filename(char *filename, in
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Line 217 void get_tmp_filename(char *filename, in
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void get_tmp_filename(char *filename, int size) |
void get_tmp_filename(char *filename, int size) |
{ |
{ |
int fd; |
int fd; |
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const char *tmpdir; |
/* XXX: race condition possible */ |
/* XXX: race condition possible */ |
pstrcpy(filename, size, "/tmp/vl.XXXXXX"); |
tmpdir = getenv("TMPDIR"); |
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if (!tmpdir) |
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tmpdir = "/tmp"; |
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snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); |
fd = mkstemp(filename); |
fd = mkstemp(filename); |
close(fd); |
close(fd); |
} |
} |
Line 206 static int is_windows_drive_prefix(const
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Line 236 static int is_windows_drive_prefix(const
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filename[1] == ':'); |
filename[1] == ':'); |
} |
} |
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static int is_windows_drive(const char *filename) |
int is_windows_drive(const char *filename) |
{ |
{ |
if (is_windows_drive_prefix(filename) && |
if (is_windows_drive_prefix(filename) && |
filename[2] == '\0') |
filename[2] == '\0') |
Line 228 static BlockDriver *find_protocol(const
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Line 258 static BlockDriver *find_protocol(const
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#ifdef _WIN32 |
#ifdef _WIN32 |
if (is_windows_drive(filename) || |
if (is_windows_drive(filename) || |
is_windows_drive_prefix(filename)) |
is_windows_drive_prefix(filename)) |
return &bdrv_raw; |
return bdrv_find_format("raw"); |
#endif |
#endif |
p = strchr(filename, ':'); |
p = strchr(filename, ':'); |
if (!p) |
if (!p) |
return &bdrv_raw; |
return bdrv_find_format("raw"); |
len = p - filename; |
len = p - filename; |
if (len > sizeof(protocol) - 1) |
if (len > sizeof(protocol) - 1) |
len = sizeof(protocol) - 1; |
len = sizeof(protocol) - 1; |
Line 246 static BlockDriver *find_protocol(const
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Line 276 static BlockDriver *find_protocol(const
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return NULL; |
return NULL; |
} |
} |
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/* XXX: force raw format if block or character device ? It would |
/* |
simplify the BSD case */ |
* Detect host devices. By convention, /dev/cdrom[N] is always |
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* recognized as a host CDROM. |
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*/ |
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static BlockDriver *find_hdev_driver(const char *filename) |
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{ |
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int score_max = 0, score; |
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BlockDriver *drv = NULL, *d; |
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for (d = first_drv; d; d = d->next) { |
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if (d->bdrv_probe_device) { |
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score = d->bdrv_probe_device(filename); |
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if (score > score_max) { |
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score_max = score; |
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drv = d; |
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} |
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} |
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} |
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return drv; |
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} |
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static BlockDriver *find_image_format(const char *filename) |
static BlockDriver *find_image_format(const char *filename) |
{ |
{ |
int ret, score, score_max; |
int ret, score, score_max; |
Line 255 static BlockDriver *find_image_format(co
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Line 305 static BlockDriver *find_image_format(co
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uint8_t buf[2048]; |
uint8_t buf[2048]; |
BlockDriverState *bs; |
BlockDriverState *bs; |
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/* detect host devices. By convention, /dev/cdrom[N] is always |
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recognized as a host CDROM */ |
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if (strstart(filename, "/dev/cdrom", NULL)) |
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return &bdrv_host_device; |
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#ifdef _WIN32 |
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if (is_windows_drive(filename)) |
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return &bdrv_host_device; |
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#else |
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{ |
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struct stat st; |
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if (stat(filename, &st) >= 0 && |
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(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
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return &bdrv_host_device; |
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} |
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} |
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#endif |
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drv = find_protocol(filename); |
drv = find_protocol(filename); |
/* no need to test disk image formats for vvfat */ |
/* no need to test disk image formats for vvfat */ |
if (drv == &bdrv_vvfat) |
if (drv && strcmp(drv->format_name, "vvfat") == 0) |
return drv; |
return drv; |
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ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
Line 305 int bdrv_file_open(BlockDriverState **pb
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Line 338 int bdrv_file_open(BlockDriverState **pb
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int ret; |
int ret; |
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bs = bdrv_new(""); |
bs = bdrv_new(""); |
if (!bs) |
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return -ENOMEM; |
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ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); |
if (ret < 0) { |
if (ret < 0) { |
bdrv_delete(bs); |
bdrv_delete(bs); |
return ret; |
return ret; |
} |
} |
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bs->growable = 1; |
*pbs = bs; |
*pbs = bs; |
return 0; |
return 0; |
} |
} |
Line 324 int bdrv_open(BlockDriverState *bs, cons
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Line 356 int bdrv_open(BlockDriverState *bs, cons
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int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
BlockDriver *drv) |
BlockDriver *drv) |
{ |
{ |
int ret, open_flags; |
int ret, open_flags, try_rw; |
char tmp_filename[PATH_MAX]; |
char tmp_filename[PATH_MAX]; |
char backing_filename[PATH_MAX]; |
char backing_filename[PATH_MAX]; |
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bs->read_only = 0; |
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bs->is_temporary = 0; |
bs->is_temporary = 0; |
bs->encrypted = 0; |
bs->encrypted = 0; |
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bs->valid_key = 0; |
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/* buffer_alignment defaulted to 512, drivers can change this value */ |
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bs->buffer_alignment = 512; |
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if (flags & BDRV_O_SNAPSHOT) { |
if (flags & BDRV_O_SNAPSHOT) { |
BlockDriverState *bs1; |
BlockDriverState *bs1; |
int64_t total_size; |
int64_t total_size; |
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int is_protocol = 0; |
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BlockDriver *bdrv_qcow2; |
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QEMUOptionParameter *options; |
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/* if snapshot, we create a temporary backing file and open it |
/* if snapshot, we create a temporary backing file and open it |
instead of opening 'filename' directly */ |
instead of opening 'filename' directly */ |
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/* if there is a backing file, use it */ |
/* if there is a backing file, use it */ |
bs1 = bdrv_new(""); |
bs1 = bdrv_new(""); |
if (!bs1) { |
ret = bdrv_open2(bs1, filename, 0, drv); |
return -ENOMEM; |
if (ret < 0) { |
} |
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if (bdrv_open(bs1, filename, 0) < 0) { |
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bdrv_delete(bs1); |
bdrv_delete(bs1); |
return -1; |
return ret; |
} |
} |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; |
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if (bs1->drv && bs1->drv->protocol_name) |
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is_protocol = 1; |
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bdrv_delete(bs1); |
bdrv_delete(bs1); |
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get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
realpath(filename, backing_filename); |
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if (bdrv_create(&bdrv_qcow2, tmp_filename, |
/* Real path is meaningless for protocols */ |
total_size, backing_filename, 0) < 0) { |
if (is_protocol) |
return -1; |
snprintf(backing_filename, sizeof(backing_filename), |
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"%s", filename); |
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else |
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realpath(filename, backing_filename); |
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bdrv_qcow2 = bdrv_find_format("qcow2"); |
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options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
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set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512); |
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set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
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if (drv) { |
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set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
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drv->format_name); |
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} |
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ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
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if (ret < 0) { |
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return ret; |
} |
} |
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filename = tmp_filename; |
filename = tmp_filename; |
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drv = bdrv_qcow2; |
bs->is_temporary = 1; |
bs->is_temporary = 1; |
} |
} |
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pstrcpy(bs->filename, sizeof(bs->filename), filename); |
pstrcpy(bs->filename, sizeof(bs->filename), filename); |
if (flags & BDRV_O_FILE) { |
if (flags & BDRV_O_FILE) { |
drv = find_protocol(filename); |
drv = find_protocol(filename); |
if (!drv) |
} else if (!drv) { |
return -ENOENT; |
drv = find_hdev_driver(filename); |
} else { |
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if (!drv) { |
if (!drv) { |
drv = find_image_format(filename); |
drv = find_image_format(filename); |
if (!drv) |
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return -1; |
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} |
} |
} |
} |
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if (!drv) { |
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ret = -ENOENT; |
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goto unlink_and_fail; |
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} |
bs->drv = drv; |
bs->drv = drv; |
bs->opaque = qemu_mallocz(drv->instance_size); |
bs->opaque = qemu_mallocz(drv->instance_size); |
if (bs->opaque == NULL && drv->instance_size > 0) |
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return -1; |
/* |
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* Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a |
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* write cache to the guest. We do need the fdatasync to flush |
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* out transactions for block allocations, and we maybe have a |
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* volatile write cache in our backing device to deal with. |
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*/ |
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if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) |
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bs->enable_write_cache = 1; |
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/* Note: for compatibility, we open disk image files as RDWR, and |
/* Note: for compatibility, we open disk image files as RDWR, and |
RDONLY as fallback */ |
RDONLY as fallback */ |
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try_rw = !bs->read_only || bs->is_temporary; |
if (!(flags & BDRV_O_FILE)) |
if (!(flags & BDRV_O_FILE)) |
open_flags = BDRV_O_RDWR | (flags & BDRV_O_DIRECT); |
open_flags = (try_rw ? BDRV_O_RDWR : 0) | |
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(flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); |
else |
else |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
ret = drv->bdrv_open(bs, filename, open_flags); |
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if (ret == -EACCES && !(flags & BDRV_O_FILE)) { |
bs->open_flags = open_flags; |
ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); |
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) |
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ret = -ENOTSUP; |
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else |
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ret = drv->bdrv_open(bs, filename, open_flags); |
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if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) { |
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ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
bs->read_only = 1; |
bs->read_only = 1; |
} |
} |
if (ret < 0) { |
if (ret < 0) { |
qemu_free(bs->opaque); |
qemu_free(bs->opaque); |
bs->opaque = NULL; |
bs->opaque = NULL; |
bs->drv = NULL; |
bs->drv = NULL; |
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unlink_and_fail: |
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if (bs->is_temporary) |
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unlink(filename); |
return ret; |
return ret; |
} |
} |
if (drv->bdrv_getlength) { |
if (drv->bdrv_getlength) { |
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
} |
} |
#ifndef _WIN32 |
#ifndef _WIN32 |
if (bs->is_temporary) { |
if (bs->is_temporary) { |
Line 404 int bdrv_open2(BlockDriverState *bs, con
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Line 481 int bdrv_open2(BlockDriverState *bs, con
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#endif |
#endif |
if (bs->backing_file[0] != '\0') { |
if (bs->backing_file[0] != '\0') { |
/* if there is a backing file, use it */ |
/* if there is a backing file, use it */ |
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BlockDriver *back_drv = NULL; |
bs->backing_hd = bdrv_new(""); |
bs->backing_hd = bdrv_new(""); |
if (!bs->backing_hd) { |
/* pass on read_only property to the backing_hd */ |
fail: |
bs->backing_hd->read_only = bs->read_only; |
bdrv_close(bs); |
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return -ENOMEM; |
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} |
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path_combine(backing_filename, sizeof(backing_filename), |
path_combine(backing_filename, sizeof(backing_filename), |
filename, bs->backing_file); |
filename, bs->backing_file); |
if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) |
if (bs->backing_format[0] != '\0') |
goto fail; |
back_drv = bdrv_find_format(bs->backing_format); |
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ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, |
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back_drv); |
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if (ret < 0) { |
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bdrv_close(bs); |
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return ret; |
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} |
} |
} |
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/* call the change callback */ |
if (!bdrv_key_required(bs)) { |
bs->media_changed = 1; |
/* call the change callback */ |
if (bs->change_cb) |
bs->media_changed = 1; |
bs->change_cb(bs->change_opaque); |
if (bs->change_cb) |
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bs->change_cb(bs->change_opaque); |
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} |
return 0; |
return 0; |
} |
} |
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Line 448 void bdrv_close(BlockDriverState *bs)
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Line 530 void bdrv_close(BlockDriverState *bs)
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void bdrv_delete(BlockDriverState *bs) |
void bdrv_delete(BlockDriverState *bs) |
{ |
{ |
/* XXX: remove the driver list */ |
BlockDriverState **pbs; |
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|
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pbs = &bdrv_first; |
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while (*pbs != bs && *pbs != NULL) |
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pbs = &(*pbs)->next; |
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if (*pbs == bs) |
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*pbs = bs->next; |
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bdrv_close(bs); |
bdrv_close(bs); |
qemu_free(bs); |
qemu_free(bs); |
} |
} |
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|
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/* |
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* Run consistency checks on an image |
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* |
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* Returns the number of errors or -errno when an internal error occurs |
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*/ |
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int bdrv_check(BlockDriverState *bs) |
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{ |
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if (bs->drv->bdrv_check == NULL) { |
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return -ENOTSUP; |
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} |
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|
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return bs->drv->bdrv_check(bs); |
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} |
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/* commit COW file into the raw image */ |
/* commit COW file into the raw image */ |
int bdrv_commit(BlockDriverState *bs) |
int bdrv_commit(BlockDriverState *bs) |
{ |
{ |
Line 472 int bdrv_commit(BlockDriverState *bs)
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Line 575 int bdrv_commit(BlockDriverState *bs)
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return -ENOTSUP; |
return -ENOTSUP; |
} |
} |
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|
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
for (i = 0; i < total_sectors;) { |
for (i = 0; i < total_sectors;) { |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
for(j = 0; j < n; j++) { |
for(j = 0; j < n; j++) { |
Line 496 int bdrv_commit(BlockDriverState *bs)
|
Line 599 int bdrv_commit(BlockDriverState *bs)
|
return 0; |
return 0; |
} |
} |
|
|
|
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
|
size_t size) |
|
{ |
|
int64_t len; |
|
|
|
if (!bdrv_is_inserted(bs)) |
|
return -ENOMEDIUM; |
|
|
|
if (bs->growable) |
|
return 0; |
|
|
|
len = bdrv_getlength(bs); |
|
|
|
if (offset < 0) |
|
return -EIO; |
|
|
|
if ((offset > len) || (len - offset < size)) |
|
return -EIO; |
|
|
|
return 0; |
|
} |
|
|
|
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
|
int nb_sectors) |
|
{ |
|
return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
|
} |
|
|
/* return < 0 if error. See bdrv_write() for the return codes */ |
/* return < 0 if error. See bdrv_write() for the return codes */ |
int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
uint8_t *buf, int nb_sectors) |
uint8_t *buf, int nb_sectors) |
Line 504 int bdrv_read(BlockDriverState *bs, int6
|
Line 635 int bdrv_read(BlockDriverState *bs, int6
|
|
|
if (!drv) |
if (!drv) |
return -ENOMEDIUM; |
return -ENOMEDIUM; |
|
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
|
return -EIO; |
|
|
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
memcpy(buf, bs->boot_sector_data, 512); |
} |
sector_num++; |
|
nb_sectors--; |
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
buf += 512; |
int nb_sectors, int dirty) |
if (nb_sectors == 0) |
{ |
return 0; |
int64_t start, end; |
} |
unsigned long val, idx, bit; |
if (drv->bdrv_pread) { |
|
int ret, len; |
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
len = nb_sectors * 512; |
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); |
|
if (ret < 0) |
for (; start <= end; start++) { |
return ret; |
idx = start / (sizeof(unsigned long) * 8); |
else if (ret != len) |
bit = start % (sizeof(unsigned long) * 8); |
return -EINVAL; |
val = bs->dirty_bitmap[idx]; |
else { |
if (dirty) { |
bs->rd_bytes += (unsigned) len; |
val |= 1 << bit; |
bs->rd_ops ++; |
} else { |
return 0; |
val &= ~(1 << bit); |
} |
} |
} else { |
bs->dirty_bitmap[idx] = val; |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
|
} |
} |
} |
} |
|
|
Line 545 int bdrv_write(BlockDriverState *bs, int
|
Line 677 int bdrv_write(BlockDriverState *bs, int
|
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (bs->read_only) |
if (bs->read_only) |
return -EACCES; |
return -EACCES; |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
memcpy(bs->boot_sector_data, buf, 512); |
return -EIO; |
} |
|
if (drv->bdrv_pwrite) { |
if (bs->dirty_bitmap) { |
int ret, len; |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
len = nb_sectors * 512; |
|
ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len); |
|
if (ret < 0) |
|
return ret; |
|
else if (ret != len) |
|
return -EIO; |
|
else { |
|
bs->wr_bytes += (unsigned) len; |
|
bs->wr_ops ++; |
|
return 0; |
|
} |
|
} else { |
|
return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
|
} |
} |
|
|
|
return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
} |
} |
|
|
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
int bdrv_pread(BlockDriverState *bs, int64_t offset, |
uint8_t *buf, int count1) |
void *buf, int count1) |
{ |
{ |
uint8_t tmp_buf[SECTOR_SIZE]; |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
int len, nb_sectors, count; |
int len, nb_sectors, count; |
int64_t sector_num; |
int64_t sector_num; |
|
int ret; |
|
|
count = count1; |
count = count1; |
/* first read to align to sector start */ |
/* first read to align to sector start */ |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
if (len > count) |
if (len > count) |
len = count; |
len = count; |
sector_num = offset >> SECTOR_BITS; |
sector_num = offset >> BDRV_SECTOR_BITS; |
if (len > 0) { |
if (len > 0) { |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
return -EIO; |
return ret; |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); |
memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
count -= len; |
count -= len; |
if (count == 0) |
if (count == 0) |
return count1; |
return count1; |
Line 591 static int bdrv_pread_em(BlockDriverStat
|
Line 713 static int bdrv_pread_em(BlockDriverStat
|
} |
} |
|
|
/* read the sectors "in place" */ |
/* read the sectors "in place" */ |
nb_sectors = count >> SECTOR_BITS; |
nb_sectors = count >> BDRV_SECTOR_BITS; |
if (nb_sectors > 0) { |
if (nb_sectors > 0) { |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
return -EIO; |
return ret; |
sector_num += nb_sectors; |
sector_num += nb_sectors; |
len = nb_sectors << SECTOR_BITS; |
len = nb_sectors << BDRV_SECTOR_BITS; |
buf += len; |
buf += len; |
count -= len; |
count -= len; |
} |
} |
|
|
/* add data from the last sector */ |
/* add data from the last sector */ |
if (count > 0) { |
if (count > 0) { |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
return -EIO; |
return ret; |
memcpy(buf, tmp_buf, count); |
memcpy(buf, tmp_buf, count); |
} |
} |
return count1; |
return count1; |
} |
} |
|
|
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
const uint8_t *buf, int count1) |
const void *buf, int count1) |
{ |
{ |
uint8_t tmp_buf[SECTOR_SIZE]; |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
int len, nb_sectors, count; |
int len, nb_sectors, count; |
int64_t sector_num; |
int64_t sector_num; |
|
int ret; |
|
|
count = count1; |
count = count1; |
/* first write to align to sector start */ |
/* first write to align to sector start */ |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
if (len > count) |
if (len > count) |
len = count; |
len = count; |
sector_num = offset >> SECTOR_BITS; |
sector_num = offset >> BDRV_SECTOR_BITS; |
if (len > 0) { |
if (len > 0) { |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
return -EIO; |
return ret; |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); |
memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
return -EIO; |
return ret; |
count -= len; |
count -= len; |
if (count == 0) |
if (count == 0) |
return count1; |
return count1; |
Line 637 static int bdrv_pwrite_em(BlockDriverSta
|
Line 760 static int bdrv_pwrite_em(BlockDriverSta
|
} |
} |
|
|
/* write the sectors "in place" */ |
/* write the sectors "in place" */ |
nb_sectors = count >> SECTOR_BITS; |
nb_sectors = count >> BDRV_SECTOR_BITS; |
if (nb_sectors > 0) { |
if (nb_sectors > 0) { |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
return -EIO; |
return ret; |
sector_num += nb_sectors; |
sector_num += nb_sectors; |
len = nb_sectors << SECTOR_BITS; |
len = nb_sectors << BDRV_SECTOR_BITS; |
buf += len; |
buf += len; |
count -= len; |
count -= len; |
} |
} |
|
|
/* add data from the last sector */ |
/* add data from the last sector */ |
if (count > 0) { |
if (count > 0) { |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
return -EIO; |
return ret; |
memcpy(tmp_buf, buf, count); |
memcpy(tmp_buf, buf, count); |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
return -EIO; |
return ret; |
} |
} |
return count1; |
return count1; |
} |
} |
|
|
/** |
/* |
* Read with byte offsets (needed only for file protocols) |
* Writes to the file and ensures that no writes are reordered across this |
|
* request (acts as a barrier) |
|
* |
|
* Returns 0 on success, -errno in error cases. |
*/ |
*/ |
int bdrv_pread(BlockDriverState *bs, int64_t offset, |
int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, |
void *buf1, int count1) |
const void *buf, int count) |
{ |
{ |
BlockDriver *drv = bs->drv; |
int ret; |
|
|
if (!drv) |
ret = bdrv_pwrite(bs, offset, buf, count); |
return -ENOMEDIUM; |
if (ret < 0) { |
if (!drv->bdrv_pread) |
return ret; |
return bdrv_pread_em(bs, offset, buf1, count1); |
} |
return drv->bdrv_pread(bs, offset, buf1, count1); |
|
|
/* No flush needed for cache=writethrough, it uses O_DSYNC */ |
|
if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) { |
|
bdrv_flush(bs); |
|
} |
|
|
|
return 0; |
} |
} |
|
|
/** |
/* |
* Write with byte offsets (needed only for file protocols) |
* Writes to the file and ensures that no writes are reordered across this |
|
* request (acts as a barrier) |
|
* |
|
* Returns 0 on success, -errno in error cases. |
*/ |
*/ |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num, |
const void *buf1, int count1) |
const uint8_t *buf, int nb_sectors) |
{ |
{ |
BlockDriver *drv = bs->drv; |
return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num, |
|
buf, BDRV_SECTOR_SIZE * nb_sectors); |
if (!drv) |
|
return -ENOMEDIUM; |
|
if (!drv->bdrv_pwrite) |
|
return bdrv_pwrite_em(bs, offset, buf1, count1); |
|
return drv->bdrv_pwrite(bs, offset, buf1, count1); |
|
} |
} |
|
|
/** |
/** |
Line 698 int bdrv_truncate(BlockDriverState *bs,
|
Line 828 int bdrv_truncate(BlockDriverState *bs,
|
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (!drv->bdrv_truncate) |
if (!drv->bdrv_truncate) |
return -ENOTSUP; |
return -ENOTSUP; |
|
if (bs->read_only) |
|
return -EACCES; |
return drv->bdrv_truncate(bs, offset); |
return drv->bdrv_truncate(bs, offset); |
} |
} |
|
|
Line 711 int64_t bdrv_getlength(BlockDriverState
|
Line 843 int64_t bdrv_getlength(BlockDriverState
|
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (!drv->bdrv_getlength) { |
if (!drv->bdrv_getlength) { |
/* legacy mode */ |
/* legacy mode */ |
return bs->total_sectors * SECTOR_SIZE; |
return bs->total_sectors * BDRV_SECTOR_SIZE; |
} |
} |
return drv->bdrv_getlength(bs); |
return drv->bdrv_getlength(bs); |
} |
} |
Line 724 void bdrv_get_geometry(BlockDriverState
|
Line 856 void bdrv_get_geometry(BlockDriverState
|
if (length < 0) |
if (length < 0) |
length = 0; |
length = 0; |
else |
else |
length = length >> SECTOR_BITS; |
length = length >> BDRV_SECTOR_BITS; |
*nb_sectors_ptr = length; |
*nb_sectors_ptr = length; |
} |
} |
|
|
/* force a given boot sector. */ |
struct partition { |
void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size) |
uint8_t boot_ind; /* 0x80 - active */ |
|
uint8_t head; /* starting head */ |
|
uint8_t sector; /* starting sector */ |
|
uint8_t cyl; /* starting cylinder */ |
|
uint8_t sys_ind; /* What partition type */ |
|
uint8_t end_head; /* end head */ |
|
uint8_t end_sector; /* end sector */ |
|
uint8_t end_cyl; /* end cylinder */ |
|
uint32_t start_sect; /* starting sector counting from 0 */ |
|
uint32_t nr_sects; /* nr of sectors in partition */ |
|
} __attribute__((packed)); |
|
|
|
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ |
|
static int guess_disk_lchs(BlockDriverState *bs, |
|
int *pcylinders, int *pheads, int *psectors) |
|
{ |
|
uint8_t buf[512]; |
|
int ret, i, heads, sectors, cylinders; |
|
struct partition *p; |
|
uint32_t nr_sects; |
|
uint64_t nb_sectors; |
|
|
|
bdrv_get_geometry(bs, &nb_sectors); |
|
|
|
ret = bdrv_read(bs, 0, buf, 1); |
|
if (ret < 0) |
|
return -1; |
|
/* test msdos magic */ |
|
if (buf[510] != 0x55 || buf[511] != 0xaa) |
|
return -1; |
|
for(i = 0; i < 4; i++) { |
|
p = ((struct partition *)(buf + 0x1be)) + i; |
|
nr_sects = le32_to_cpu(p->nr_sects); |
|
if (nr_sects && p->end_head) { |
|
/* We make the assumption that the partition terminates on |
|
a cylinder boundary */ |
|
heads = p->end_head + 1; |
|
sectors = p->end_sector & 63; |
|
if (sectors == 0) |
|
continue; |
|
cylinders = nb_sectors / (heads * sectors); |
|
if (cylinders < 1 || cylinders > 16383) |
|
continue; |
|
*pheads = heads; |
|
*psectors = sectors; |
|
*pcylinders = cylinders; |
|
#if 0 |
|
printf("guessed geometry: LCHS=%d %d %d\n", |
|
cylinders, heads, sectors); |
|
#endif |
|
return 0; |
|
} |
|
} |
|
return -1; |
|
} |
|
|
|
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
{ |
{ |
bs->boot_sector_enabled = 1; |
int translation, lba_detected = 0; |
if (size > 512) |
int cylinders, heads, secs; |
size = 512; |
uint64_t nb_sectors; |
memcpy(bs->boot_sector_data, data, size); |
|
memset(bs->boot_sector_data + size, 0, 512 - size); |
/* if a geometry hint is available, use it */ |
|
bdrv_get_geometry(bs, &nb_sectors); |
|
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
|
translation = bdrv_get_translation_hint(bs); |
|
if (cylinders != 0) { |
|
*pcyls = cylinders; |
|
*pheads = heads; |
|
*psecs = secs; |
|
} else { |
|
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
|
if (heads > 16) { |
|
/* if heads > 16, it means that a BIOS LBA |
|
translation was active, so the default |
|
hardware geometry is OK */ |
|
lba_detected = 1; |
|
goto default_geometry; |
|
} else { |
|
*pcyls = cylinders; |
|
*pheads = heads; |
|
*psecs = secs; |
|
/* disable any translation to be in sync with |
|
the logical geometry */ |
|
if (translation == BIOS_ATA_TRANSLATION_AUTO) { |
|
bdrv_set_translation_hint(bs, |
|
BIOS_ATA_TRANSLATION_NONE); |
|
} |
|
} |
|
} else { |
|
default_geometry: |
|
/* if no geometry, use a standard physical disk geometry */ |
|
cylinders = nb_sectors / (16 * 63); |
|
|
|
if (cylinders > 16383) |
|
cylinders = 16383; |
|
else if (cylinders < 2) |
|
cylinders = 2; |
|
*pcyls = cylinders; |
|
*pheads = 16; |
|
*psecs = 63; |
|
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
|
if ((*pcyls * *pheads) <= 131072) { |
|
bdrv_set_translation_hint(bs, |
|
BIOS_ATA_TRANSLATION_LARGE); |
|
} else { |
|
bdrv_set_translation_hint(bs, |
|
BIOS_ATA_TRANSLATION_LBA); |
|
} |
|
} |
|
} |
|
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
|
} |
} |
} |
|
|
void bdrv_set_geometry_hint(BlockDriverState *bs, |
void bdrv_set_geometry_hint(BlockDriverState *bs, |
Line 786 int bdrv_is_read_only(BlockDriverState *
|
Line 1024 int bdrv_is_read_only(BlockDriverState *
|
return bs->read_only; |
return bs->read_only; |
} |
} |
|
|
|
int bdrv_set_read_only(BlockDriverState *bs, int read_only) |
|
{ |
|
int ret = bs->read_only; |
|
bs->read_only = read_only; |
|
return ret; |
|
} |
|
|
int bdrv_is_sg(BlockDriverState *bs) |
int bdrv_is_sg(BlockDriverState *bs) |
{ |
{ |
return bs->sg; |
return bs->sg; |
} |
} |
|
|
|
int bdrv_enable_write_cache(BlockDriverState *bs) |
|
{ |
|
return bs->enable_write_cache; |
|
} |
|
|
/* XXX: no longer used */ |
/* XXX: no longer used */ |
void bdrv_set_change_cb(BlockDriverState *bs, |
void bdrv_set_change_cb(BlockDriverState *bs, |
void (*change_cb)(void *opaque), void *opaque) |
void (*change_cb)(void *opaque), void *opaque) |
Line 806 int bdrv_is_encrypted(BlockDriverState *
|
Line 1056 int bdrv_is_encrypted(BlockDriverState *
|
return bs->encrypted; |
return bs->encrypted; |
} |
} |
|
|
|
int bdrv_key_required(BlockDriverState *bs) |
|
{ |
|
BlockDriverState *backing_hd = bs->backing_hd; |
|
|
|
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) |
|
return 1; |
|
return (bs->encrypted && !bs->valid_key); |
|
} |
|
|
int bdrv_set_key(BlockDriverState *bs, const char *key) |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
{ |
{ |
int ret; |
int ret; |
Line 818 int bdrv_set_key(BlockDriverState *bs, c
|
Line 1077 int bdrv_set_key(BlockDriverState *bs, c
|
} |
} |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) |
return -1; |
return -1; |
return bs->drv->bdrv_set_key(bs, key); |
ret = bs->drv->bdrv_set_key(bs, key); |
|
if (ret < 0) { |
|
bs->valid_key = 0; |
|
} else if (!bs->valid_key) { |
|
bs->valid_key = 1; |
|
/* call the change callback now, we skipped it on open */ |
|
bs->media_changed = 1; |
|
if (bs->change_cb) |
|
bs->change_cb(bs->change_opaque); |
|
} |
|
return ret; |
} |
} |
|
|
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
Line 851 BlockDriverState *bdrv_find(const char *
|
Line 1120 BlockDriverState *bdrv_find(const char *
|
return NULL; |
return NULL; |
} |
} |
|
|
void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
{ |
{ |
BlockDriverState *bs; |
BlockDriverState *bs; |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
it(opaque, bs->device_name); |
it(opaque, bs); |
} |
} |
} |
} |
|
|
Line 867 const char *bdrv_get_device_name(BlockDr
|
Line 1136 const char *bdrv_get_device_name(BlockDr
|
|
|
void bdrv_flush(BlockDriverState *bs) |
void bdrv_flush(BlockDriverState *bs) |
{ |
{ |
|
if (!bs->drv) |
|
return; |
if (bs->drv->bdrv_flush) |
if (bs->drv->bdrv_flush) |
bs->drv->bdrv_flush(bs); |
bs->drv->bdrv_flush(bs); |
if (bs->backing_hd) |
if (bs->backing_hd) |
bdrv_flush(bs->backing_hd); |
bdrv_flush(bs->backing_hd); |
} |
} |
|
|
#ifndef QEMU_IMG |
void bdrv_flush_all(void) |
void bdrv_info(void) |
|
{ |
{ |
BlockDriverState *bs; |
BlockDriverState *bs; |
|
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
|
if (bs->drv && !bdrv_is_read_only(bs) && |
|
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
|
bdrv_flush(bs); |
|
} |
|
|
|
/* |
|
* Returns true iff the specified sector is present in the disk image. Drivers |
|
* not implementing the functionality are assumed to not support backing files, |
|
* hence all their sectors are reported as allocated. |
|
* |
|
* 'pnum' is set to the number of sectors (including and immediately following |
|
* the specified sector) that are known to be in the same |
|
* allocated/unallocated state. |
|
* |
|
* 'nb_sectors' is the max value 'pnum' should be set to. |
|
*/ |
|
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
|
int *pnum) |
|
{ |
|
int64_t n; |
|
if (!bs->drv->bdrv_is_allocated) { |
|
if (sector_num >= bs->total_sectors) { |
|
*pnum = 0; |
|
return 0; |
|
} |
|
n = bs->total_sectors - sector_num; |
|
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
|
return 1; |
|
} |
|
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); |
|
} |
|
|
|
static void bdrv_print_dict(QObject *obj, void *opaque) |
|
{ |
|
QDict *bs_dict; |
|
Monitor *mon = opaque; |
|
|
|
bs_dict = qobject_to_qdict(obj); |
|
|
|
monitor_printf(mon, "%s: type=%s removable=%d", |
|
qdict_get_str(bs_dict, "device"), |
|
qdict_get_str(bs_dict, "type"), |
|
qdict_get_bool(bs_dict, "removable")); |
|
|
|
if (qdict_get_bool(bs_dict, "removable")) { |
|
monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); |
|
} |
|
|
|
if (qdict_haskey(bs_dict, "inserted")) { |
|
QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); |
|
|
|
monitor_printf(mon, " file="); |
|
monitor_print_filename(mon, qdict_get_str(qdict, "file")); |
|
if (qdict_haskey(qdict, "backing_file")) { |
|
monitor_printf(mon, " backing_file="); |
|
monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); |
|
} |
|
monitor_printf(mon, " ro=%d drv=%s encrypted=%d", |
|
qdict_get_bool(qdict, "ro"), |
|
qdict_get_str(qdict, "drv"), |
|
qdict_get_bool(qdict, "encrypted")); |
|
} else { |
|
monitor_printf(mon, " [not inserted]"); |
|
} |
|
|
|
monitor_printf(mon, "\n"); |
|
} |
|
|
|
void bdrv_info_print(Monitor *mon, const QObject *data) |
|
{ |
|
qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); |
|
} |
|
|
|
/** |
|
* bdrv_info(): Block devices information |
|
* |
|
* Each block device information is stored in a QDict and the |
|
* returned QObject is a QList of all devices. |
|
* |
|
* The QDict contains the following: |
|
* |
|
* - "device": device name |
|
* - "type": device type |
|
* - "removable": true if the device is removable, false otherwise |
|
* - "locked": true if the device is locked, false otherwise |
|
* - "inserted": only present if the device is inserted, it is a QDict |
|
* containing the following: |
|
* - "file": device file name |
|
* - "ro": true if read-only, false otherwise |
|
* - "drv": driver format name |
|
* - "backing_file": backing file name if one is used |
|
* - "encrypted": true if encrypted, false otherwise |
|
* |
|
* Example: |
|
* |
|
* [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false, |
|
* "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } }, |
|
* { "device": "floppy0", "type": "floppy", "removable": true, |
|
* "locked": false } ] |
|
*/ |
|
void bdrv_info(Monitor *mon, QObject **ret_data) |
|
{ |
|
QList *bs_list; |
|
BlockDriverState *bs; |
|
|
|
bs_list = qlist_new(); |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
term_printf("%s:", bs->device_name); |
QObject *bs_obj; |
term_printf(" type="); |
const char *type = "unknown"; |
|
|
switch(bs->type) { |
switch(bs->type) { |
case BDRV_TYPE_HD: |
case BDRV_TYPE_HD: |
term_printf("hd"); |
type = "hd"; |
break; |
break; |
case BDRV_TYPE_CDROM: |
case BDRV_TYPE_CDROM: |
term_printf("cdrom"); |
type = "cdrom"; |
break; |
break; |
case BDRV_TYPE_FLOPPY: |
case BDRV_TYPE_FLOPPY: |
term_printf("floppy"); |
type = "floppy"; |
break; |
break; |
} |
} |
term_printf(" removable=%d", bs->removable); |
|
if (bs->removable) { |
bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, " |
term_printf(" locked=%d", bs->locked); |
"'removable': %i, 'locked': %i }", |
} |
bs->device_name, type, bs->removable, |
|
bs->locked); |
|
assert(bs_obj != NULL); |
|
|
if (bs->drv) { |
if (bs->drv) { |
term_printf(" file="); |
QObject *obj; |
term_print_filename(bs->filename); |
QDict *bs_dict = qobject_to_qdict(bs_obj); |
|
|
|
obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " |
|
"'encrypted': %i }", |
|
bs->filename, bs->read_only, |
|
bs->drv->format_name, |
|
bdrv_is_encrypted(bs)); |
|
assert(obj != NULL); |
if (bs->backing_file[0] != '\0') { |
if (bs->backing_file[0] != '\0') { |
term_printf(" backing_file="); |
QDict *qdict = qobject_to_qdict(obj); |
term_print_filename(bs->backing_file); |
qdict_put(qdict, "backing_file", |
} |
qstring_from_str(bs->backing_file)); |
term_printf(" ro=%d", bs->read_only); |
} |
term_printf(" drv=%s", bs->drv->format_name); |
|
if (bs->encrypted) |
qdict_put_obj(bs_dict, "inserted", obj); |
term_printf(" encrypted"); |
|
} else { |
|
term_printf(" [not inserted]"); |
|
} |
} |
term_printf("\n"); |
qlist_append_obj(bs_list, bs_obj); |
} |
} |
|
|
|
*ret_data = QOBJECT(bs_list); |
|
} |
|
|
|
static void bdrv_stats_iter(QObject *data, void *opaque) |
|
{ |
|
QDict *qdict; |
|
Monitor *mon = opaque; |
|
|
|
qdict = qobject_to_qdict(data); |
|
monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); |
|
|
|
qdict = qobject_to_qdict(qdict_get(qdict, "stats")); |
|
monitor_printf(mon, " rd_bytes=%" PRId64 |
|
" wr_bytes=%" PRId64 |
|
" rd_operations=%" PRId64 |
|
" wr_operations=%" PRId64 |
|
"\n", |
|
qdict_get_int(qdict, "rd_bytes"), |
|
qdict_get_int(qdict, "wr_bytes"), |
|
qdict_get_int(qdict, "rd_operations"), |
|
qdict_get_int(qdict, "wr_operations")); |
} |
} |
|
|
/* The "info blockstats" command. */ |
void bdrv_stats_print(Monitor *mon, const QObject *data) |
void bdrv_info_stats (void) |
{ |
|
qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); |
|
} |
|
|
|
/** |
|
* bdrv_info_stats(): show block device statistics |
|
* |
|
* Each device statistic information is stored in a QDict and |
|
* the returned QObject is a QList of all devices. |
|
* |
|
* The QDict contains the following: |
|
* |
|
* - "device": device name |
|
* - "stats": A QDict with the statistics information, it contains: |
|
* - "rd_bytes": bytes read |
|
* - "wr_bytes": bytes written |
|
* - "rd_operations": read operations |
|
* - "wr_operations": write operations |
|
* |
|
* Example: |
|
* |
|
* [ { "device": "ide0-hd0", |
|
* "stats": { "rd_bytes": 512, |
|
* "wr_bytes": 0, |
|
* "rd_operations": 1, |
|
* "wr_operations": 0 } }, |
|
* { "device": "ide1-cd0", |
|
* "stats": { "rd_bytes": 0, |
|
* "wr_bytes": 0, |
|
* "rd_operations": 0, |
|
* "wr_operations": 0 } } ] |
|
*/ |
|
void bdrv_info_stats(Monitor *mon, QObject **ret_data) |
{ |
{ |
|
QObject *obj; |
|
QList *devices; |
BlockDriverState *bs; |
BlockDriverState *bs; |
|
|
|
devices = qlist_new(); |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
term_printf ("%s:" |
obj = qobject_from_jsonf("{ 'device': %s, 'stats': {" |
" rd_bytes=%" PRIu64 |
"'rd_bytes': %" PRId64 "," |
" wr_bytes=%" PRIu64 |
"'wr_bytes': %" PRId64 "," |
" rd_operations=%" PRIu64 |
"'rd_operations': %" PRId64 "," |
" wr_operations=%" PRIu64 |
"'wr_operations': %" PRId64 |
"\n", |
"} }", |
bs->device_name, |
bs->device_name, |
bs->rd_bytes, bs->wr_bytes, |
bs->rd_bytes, bs->wr_bytes, |
bs->rd_ops, bs->wr_ops); |
bs->rd_ops, bs->wr_ops); |
|
assert(obj != NULL); |
|
qlist_append_obj(devices, obj); |
} |
} |
|
|
|
*ret_data = QOBJECT(devices); |
|
} |
|
|
|
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
|
{ |
|
if (bs->backing_hd && bs->backing_hd->encrypted) |
|
return bs->backing_file; |
|
else if (bs->encrypted) |
|
return bs->filename; |
|
else |
|
return NULL; |
} |
} |
#endif |
|
|
|
void bdrv_get_backing_filename(BlockDriverState *bs, |
void bdrv_get_backing_filename(BlockDriverState *bs, |
char *filename, int filename_size) |
char *filename, int filename_size) |
Line 951 int bdrv_write_compressed(BlockDriverSta
|
Line 1408 int bdrv_write_compressed(BlockDriverSta
|
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (!drv->bdrv_write_compressed) |
if (!drv->bdrv_write_compressed) |
return -ENOTSUP; |
return -ENOTSUP; |
|
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
|
return -EIO; |
|
|
|
if (bs->dirty_bitmap) { |
|
set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
|
} |
|
|
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
} |
} |
|
|
Line 965 int bdrv_get_info(BlockDriverState *bs,
|
Line 1429 int bdrv_get_info(BlockDriverState *bs,
|
return drv->bdrv_get_info(bs, bdi); |
return drv->bdrv_get_info(bs, bdi); |
} |
} |
|
|
|
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
|
int64_t pos, int size) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (!drv->bdrv_save_vmstate) |
|
return -ENOTSUP; |
|
return drv->bdrv_save_vmstate(bs, buf, pos, size); |
|
} |
|
|
|
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
|
int64_t pos, int size) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (!drv->bdrv_load_vmstate) |
|
return -ENOTSUP; |
|
return drv->bdrv_load_vmstate(bs, buf, pos, size); |
|
} |
|
|
/**************************************************************/ |
/**************************************************************/ |
/* handling of snapshots */ |
/* handling of snapshots */ |
|
|
Line 1088 char *bdrv_snapshot_dump(char *buf, int
|
Line 1574 char *bdrv_snapshot_dump(char *buf, int
|
/**************************************************************/ |
/**************************************************************/ |
/* async I/Os */ |
/* async I/Os */ |
|
|
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
uint8_t *buf, int nb_sectors, |
QEMUIOVector *qiov, int nb_sectors, |
BlockDriverCompletionFunc *cb, void *opaque) |
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
BlockDriverAIOCB *ret; |
BlockDriverAIOCB *ret; |
|
|
if (!drv) |
if (!drv) |
return NULL; |
return NULL; |
|
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
|
return NULL; |
|
|
/* XXX: we assume that nb_sectors == 0 is suppored by the async read */ |
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
cb, opaque); |
memcpy(buf, bs->boot_sector_data, 512); |
|
sector_num++; |
|
nb_sectors--; |
|
buf += 512; |
|
} |
|
|
|
ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
|
|
|
if (ret) { |
if (ret) { |
/* Update stats even though technically transfer has not happened. */ |
/* Update stats even though technically transfer has not happened. */ |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE; |
bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
bs->rd_ops ++; |
bs->rd_ops ++; |
} |
} |
|
|
return ret; |
return ret; |
} |
} |
|
|
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
const uint8_t *buf, int nb_sectors, |
QEMUIOVector *qiov, int nb_sectors, |
BlockDriverCompletionFunc *cb, void *opaque) |
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
BlockDriverAIOCB *ret; |
BlockDriverAIOCB *ret; |
Line 1128 BlockDriverAIOCB *bdrv_aio_write(BlockDr
|
Line 1609 BlockDriverAIOCB *bdrv_aio_write(BlockDr
|
return NULL; |
return NULL; |
if (bs->read_only) |
if (bs->read_only) |
return NULL; |
return NULL; |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
memcpy(bs->boot_sector_data, buf, 512); |
return NULL; |
|
|
|
if (bs->dirty_bitmap) { |
|
set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
} |
} |
|
|
ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
|
cb, opaque); |
|
|
if (ret) { |
if (ret) { |
/* Update stats even though technically transfer has not happened. */ |
/* Update stats even though technically transfer has not happened. */ |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE; |
bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
bs->wr_ops ++; |
bs->wr_ops ++; |
} |
} |
|
|
return ret; |
return ret; |
} |
} |
|
|
void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
|
|
typedef struct MultiwriteCB { |
|
int error; |
|
int num_requests; |
|
int num_callbacks; |
|
struct { |
|
BlockDriverCompletionFunc *cb; |
|
void *opaque; |
|
QEMUIOVector *free_qiov; |
|
void *free_buf; |
|
} callbacks[]; |
|
} MultiwriteCB; |
|
|
|
static void multiwrite_user_cb(MultiwriteCB *mcb) |
{ |
{ |
BlockDriver *drv = acb->bs->drv; |
int i; |
|
|
drv->bdrv_aio_cancel(acb); |
for (i = 0; i < mcb->num_callbacks; i++) { |
|
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
|
if (mcb->callbacks[i].free_qiov) { |
|
qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
|
} |
|
qemu_free(mcb->callbacks[i].free_qiov); |
|
qemu_vfree(mcb->callbacks[i].free_buf); |
|
} |
} |
} |
|
|
|
static void multiwrite_cb(void *opaque, int ret) |
|
{ |
|
MultiwriteCB *mcb = opaque; |
|
|
/**************************************************************/ |
if (ret < 0 && !mcb->error) { |
/* async block device emulation */ |
mcb->error = ret; |
|
} |
|
|
#ifdef QEMU_IMG |
mcb->num_requests--; |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
if (mcb->num_requests == 0) { |
int64_t sector_num, uint8_t *buf, int nb_sectors, |
multiwrite_user_cb(mcb); |
BlockDriverCompletionFunc *cb, void *opaque) |
qemu_free(mcb); |
|
} |
|
} |
|
|
|
static int multiwrite_req_compare(const void *a, const void *b) |
{ |
{ |
int ret; |
const BlockRequest *req1 = a, *req2 = b; |
ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
|
cb(opaque, ret); |
/* |
return NULL; |
* Note that we can't simply subtract req2->sector from req1->sector |
|
* here as that could overflow the return value. |
|
*/ |
|
if (req1->sector > req2->sector) { |
|
return 1; |
|
} else if (req1->sector < req2->sector) { |
|
return -1; |
|
} else { |
|
return 0; |
|
} |
|
} |
|
|
|
/* |
|
* Takes a bunch of requests and tries to merge them. Returns the number of |
|
* requests that remain after merging. |
|
*/ |
|
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
|
int num_reqs, MultiwriteCB *mcb) |
|
{ |
|
int i, outidx; |
|
|
|
// Sort requests by start sector |
|
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); |
|
|
|
// Check if adjacent requests touch the same clusters. If so, combine them, |
|
// filling up gaps with zero sectors. |
|
outidx = 0; |
|
for (i = 1; i < num_reqs; i++) { |
|
int merge = 0; |
|
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
|
|
|
// This handles the cases that are valid for all block drivers, namely |
|
// exactly sequential writes and overlapping writes. |
|
if (reqs[i].sector <= oldreq_last) { |
|
merge = 1; |
|
} |
|
|
|
// The block driver may decide that it makes sense to combine requests |
|
// even if there is a gap of some sectors between them. In this case, |
|
// the gap is filled with zeros (therefore only applicable for yet |
|
// unused space in format like qcow2). |
|
if (!merge && bs->drv->bdrv_merge_requests) { |
|
merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
|
} |
|
|
|
if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
|
merge = 0; |
|
} |
|
|
|
if (merge) { |
|
size_t size; |
|
QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); |
|
qemu_iovec_init(qiov, |
|
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); |
|
|
|
// Add the first request to the merged one. If the requests are |
|
// overlapping, drop the last sectors of the first request. |
|
size = (reqs[i].sector - reqs[outidx].sector) << 9; |
|
qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
|
|
|
// We might need to add some zeros between the two requests |
|
if (reqs[i].sector > oldreq_last) { |
|
size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; |
|
uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
|
memset(buf, 0, zero_bytes); |
|
qemu_iovec_add(qiov, buf, zero_bytes); |
|
mcb->callbacks[i].free_buf = buf; |
|
} |
|
|
|
// Add the second request |
|
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
|
|
|
reqs[outidx].nb_sectors = qiov->size >> 9; |
|
reqs[outidx].qiov = qiov; |
|
|
|
mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
|
} else { |
|
outidx++; |
|
reqs[outidx].sector = reqs[i].sector; |
|
reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
|
reqs[outidx].qiov = reqs[i].qiov; |
|
} |
|
} |
|
|
|
return outidx + 1; |
|
} |
|
|
|
/* |
|
* Submit multiple AIO write requests at once. |
|
* |
|
* On success, the function returns 0 and all requests in the reqs array have |
|
* been submitted. In error case this function returns -1, and any of the |
|
* requests may or may not be submitted yet. In particular, this means that the |
|
* callback will be called for some of the requests, for others it won't. The |
|
* caller must check the error field of the BlockRequest to wait for the right |
|
* callbacks (if error != 0, no callback will be called). |
|
* |
|
* The implementation may modify the contents of the reqs array, e.g. to merge |
|
* requests. However, the fields opaque and error are left unmodified as they |
|
* are used to signal failure for a single request to the caller. |
|
*/ |
|
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
|
{ |
|
BlockDriverAIOCB *acb; |
|
MultiwriteCB *mcb; |
|
int i; |
|
|
|
if (num_reqs == 0) { |
|
return 0; |
|
} |
|
|
|
// Create MultiwriteCB structure |
|
mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
|
mcb->num_requests = 0; |
|
mcb->num_callbacks = num_reqs; |
|
|
|
for (i = 0; i < num_reqs; i++) { |
|
mcb->callbacks[i].cb = reqs[i].cb; |
|
mcb->callbacks[i].opaque = reqs[i].opaque; |
|
} |
|
|
|
// Check for mergable requests |
|
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
|
|
|
/* |
|
* Run the aio requests. As soon as one request can't be submitted |
|
* successfully, fail all requests that are not yet submitted (we must |
|
* return failure for all requests anyway) |
|
* |
|
* num_requests cannot be set to the right value immediately: If |
|
* bdrv_aio_writev fails for some request, num_requests would be too high |
|
* and therefore multiwrite_cb() would never recognize the multiwrite |
|
* request as completed. We also cannot use the loop variable i to set it |
|
* when the first request fails because the callback may already have been |
|
* called for previously submitted requests. Thus, num_requests must be |
|
* incremented for each request that is submitted. |
|
* |
|
* The problem that callbacks may be called early also means that we need |
|
* to take care that num_requests doesn't become 0 before all requests are |
|
* submitted - multiwrite_cb() would consider the multiwrite request |
|
* completed. A dummy request that is "completed" by a manual call to |
|
* multiwrite_cb() takes care of this. |
|
*/ |
|
mcb->num_requests = 1; |
|
|
|
for (i = 0; i < num_reqs; i++) { |
|
mcb->num_requests++; |
|
acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
|
reqs[i].nb_sectors, multiwrite_cb, mcb); |
|
|
|
if (acb == NULL) { |
|
// We can only fail the whole thing if no request has been |
|
// submitted yet. Otherwise we'll wait for the submitted AIOs to |
|
// complete and report the error in the callback. |
|
if (i == 0) { |
|
goto fail; |
|
} else { |
|
multiwrite_cb(mcb, -EIO); |
|
break; |
|
} |
|
} |
|
} |
|
|
|
/* Complete the dummy request */ |
|
multiwrite_cb(mcb, 0); |
|
|
|
return 0; |
|
|
|
fail: |
|
for (i = 0; i < mcb->num_callbacks; i++) { |
|
reqs[i].error = -EIO; |
|
} |
|
qemu_free(mcb); |
|
return -1; |
} |
} |
|
|
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
int ret; |
BlockDriver *drv = bs->drv; |
ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
|
cb(opaque, ret); |
if (!drv) |
return NULL; |
return NULL; |
|
|
|
/* |
|
* Note that unlike bdrv_flush the driver is reponsible for flushing a |
|
* backing image if it exists. |
|
*/ |
|
return drv->bdrv_aio_flush(bs, cb, opaque); |
} |
} |
|
|
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb) |
void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
{ |
{ |
|
acb->pool->cancel(acb); |
} |
} |
#else |
|
|
|
|
/**************************************************************/ |
|
/* async block device emulation */ |
|
|
|
typedef struct BlockDriverAIOCBSync { |
|
BlockDriverAIOCB common; |
|
QEMUBH *bh; |
|
int ret; |
|
/* vector translation state */ |
|
QEMUIOVector *qiov; |
|
uint8_t *bounce; |
|
int is_write; |
|
} BlockDriverAIOCBSync; |
|
|
|
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
|
{ |
|
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
|
qemu_bh_delete(acb->bh); |
|
acb->bh = NULL; |
|
qemu_aio_release(acb); |
|
} |
|
|
|
static AIOPool bdrv_em_aio_pool = { |
|
.aiocb_size = sizeof(BlockDriverAIOCBSync), |
|
.cancel = bdrv_aio_cancel_em, |
|
}; |
|
|
static void bdrv_aio_bh_cb(void *opaque) |
static void bdrv_aio_bh_cb(void *opaque) |
{ |
{ |
BlockDriverAIOCBSync *acb = opaque; |
BlockDriverAIOCBSync *acb = opaque; |
|
|
|
if (!acb->is_write) |
|
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
|
qemu_vfree(acb->bounce); |
acb->common.cb(acb->common.opaque, acb->ret); |
acb->common.cb(acb->common.opaque, acb->ret); |
|
qemu_bh_delete(acb->bh); |
|
acb->bh = NULL; |
qemu_aio_release(acb); |
qemu_aio_release(acb); |
} |
} |
|
|
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
int64_t sector_num, uint8_t *buf, int nb_sectors, |
int64_t sector_num, |
BlockDriverCompletionFunc *cb, void *opaque) |
QEMUIOVector *qiov, |
|
int nb_sectors, |
|
BlockDriverCompletionFunc *cb, |
|
void *opaque, |
|
int is_write) |
|
|
{ |
{ |
BlockDriverAIOCBSync *acb; |
BlockDriverAIOCBSync *acb; |
int ret; |
|
|
|
acb = qemu_aio_get(bs, cb, opaque); |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
|
acb->is_write = is_write; |
|
acb->qiov = qiov; |
|
acb->bounce = qemu_blockalign(bs, qiov->size); |
|
|
if (!acb->bh) |
if (!acb->bh) |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
|
acb->ret = ret; |
if (is_write) { |
|
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
|
acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
|
} else { |
|
acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
|
} |
|
|
qemu_bh_schedule(acb->bh); |
qemu_bh_schedule(acb->bh); |
|
|
return &acb->common; |
return &acb->common; |
} |
} |
|
|
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
|
{ |
|
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
|
} |
|
|
|
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
|
{ |
|
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
|
} |
|
|
|
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
BlockDriverCompletionFunc *cb, void *opaque) |
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
BlockDriverAIOCBSync *acb; |
BlockDriverAIOCBSync *acb; |
int ret; |
|
|
|
acb = qemu_aio_get(bs, cb, opaque); |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
|
acb->is_write = 1; /* don't bounce in the completion hadler */ |
|
acb->qiov = NULL; |
|
acb->bounce = NULL; |
|
acb->ret = 0; |
|
|
if (!acb->bh) |
if (!acb->bh) |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
|
acb->ret = ret; |
bdrv_flush(bs); |
qemu_bh_schedule(acb->bh); |
qemu_bh_schedule(acb->bh); |
return &acb->common; |
return &acb->common; |
} |
} |
|
|
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
|
{ |
|
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
|
qemu_bh_cancel(acb->bh); |
|
qemu_aio_release(acb); |
|
} |
|
#endif /* !QEMU_IMG */ |
|
|
|
/**************************************************************/ |
/**************************************************************/ |
/* sync block device emulation */ |
/* sync block device emulation */ |
|
|
Line 1241 static int bdrv_read_em(BlockDriverState
|
Line 1990 static int bdrv_read_em(BlockDriverState
|
{ |
{ |
int async_ret; |
int async_ret; |
BlockDriverAIOCB *acb; |
BlockDriverAIOCB *acb; |
|
struct iovec iov; |
|
QEMUIOVector qiov; |
|
|
|
async_context_push(); |
|
|
async_ret = NOT_DONE; |
async_ret = NOT_DONE; |
qemu_aio_wait_start(); |
iov.iov_base = (void *)buf; |
acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
iov.iov_len = nb_sectors * 512; |
bdrv_rw_em_cb, &async_ret); |
qemu_iovec_init_external(&qiov, &iov, 1); |
|
acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
|
bdrv_rw_em_cb, &async_ret); |
if (acb == NULL) { |
if (acb == NULL) { |
qemu_aio_wait_end(); |
async_ret = -1; |
return -1; |
goto fail; |
} |
} |
|
|
while (async_ret == NOT_DONE) { |
while (async_ret == NOT_DONE) { |
qemu_aio_wait(); |
qemu_aio_wait(); |
} |
} |
qemu_aio_wait_end(); |
|
|
|
|
fail: |
|
async_context_pop(); |
return async_ret; |
return async_ret; |
} |
} |
|
|
Line 1262 static int bdrv_write_em(BlockDriverStat
|
Line 2021 static int bdrv_write_em(BlockDriverStat
|
{ |
{ |
int async_ret; |
int async_ret; |
BlockDriverAIOCB *acb; |
BlockDriverAIOCB *acb; |
|
struct iovec iov; |
|
QEMUIOVector qiov; |
|
|
|
async_context_push(); |
|
|
async_ret = NOT_DONE; |
async_ret = NOT_DONE; |
qemu_aio_wait_start(); |
iov.iov_base = (void *)buf; |
acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
iov.iov_len = nb_sectors * 512; |
bdrv_rw_em_cb, &async_ret); |
qemu_iovec_init_external(&qiov, &iov, 1); |
|
acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
|
bdrv_rw_em_cb, &async_ret); |
if (acb == NULL) { |
if (acb == NULL) { |
qemu_aio_wait_end(); |
async_ret = -1; |
return -1; |
goto fail; |
} |
} |
while (async_ret == NOT_DONE) { |
while (async_ret == NOT_DONE) { |
qemu_aio_wait(); |
qemu_aio_wait(); |
} |
} |
qemu_aio_wait_end(); |
|
|
fail: |
|
async_context_pop(); |
return async_ret; |
return async_ret; |
} |
} |
|
|
void bdrv_init(void) |
void bdrv_init(void) |
{ |
{ |
bdrv_register(&bdrv_raw); |
module_call_init(MODULE_INIT_BLOCK); |
bdrv_register(&bdrv_host_device); |
|
#ifndef _WIN32 |
|
bdrv_register(&bdrv_cow); |
|
#endif |
|
bdrv_register(&bdrv_qcow); |
|
bdrv_register(&bdrv_vmdk); |
|
bdrv_register(&bdrv_cloop); |
|
bdrv_register(&bdrv_dmg); |
|
bdrv_register(&bdrv_bochs); |
|
bdrv_register(&bdrv_vpc); |
|
bdrv_register(&bdrv_vvfat); |
|
bdrv_register(&bdrv_qcow2); |
|
bdrv_register(&bdrv_parallels); |
|
} |
} |
|
|
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb, |
void bdrv_init_with_whitelist(void) |
void *opaque) |
{ |
|
use_bdrv_whitelist = 1; |
|
bdrv_init(); |
|
} |
|
|
|
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
BlockDriver *drv; |
|
BlockDriverAIOCB *acb; |
BlockDriverAIOCB *acb; |
|
|
drv = bs->drv; |
if (pool->free_aiocb) { |
if (drv->free_aiocb) { |
acb = pool->free_aiocb; |
acb = drv->free_aiocb; |
pool->free_aiocb = acb->next; |
drv->free_aiocb = acb->next; |
|
} else { |
} else { |
acb = qemu_mallocz(drv->aiocb_size); |
acb = qemu_mallocz(pool->aiocb_size); |
if (!acb) |
acb->pool = pool; |
return NULL; |
|
} |
} |
acb->bs = bs; |
acb->bs = bs; |
acb->cb = cb; |
acb->cb = cb; |
Line 1319 void *qemu_aio_get(BlockDriverState *bs,
|
Line 2076 void *qemu_aio_get(BlockDriverState *bs,
|
|
|
void qemu_aio_release(void *p) |
void qemu_aio_release(void *p) |
{ |
{ |
BlockDriverAIOCB *acb = p; |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
BlockDriver *drv = acb->bs->drv; |
AIOPool *pool = acb->pool; |
acb->next = drv->free_aiocb; |
acb->next = pool->free_aiocb; |
drv->free_aiocb = acb; |
pool->free_aiocb = acb; |
} |
} |
|
|
/**************************************************************/ |
/**************************************************************/ |
Line 1365 int bdrv_media_changed(BlockDriverState
|
Line 2122 int bdrv_media_changed(BlockDriverState
|
/** |
/** |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray |
*/ |
*/ |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
int bdrv_eject(BlockDriverState *bs, int eject_flag) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
int ret; |
int ret; |
|
|
|
if (bs->locked) { |
|
return -EBUSY; |
|
} |
|
|
if (!drv || !drv->bdrv_eject) { |
if (!drv || !drv->bdrv_eject) { |
ret = -ENOTSUP; |
ret = -ENOTSUP; |
} else { |
} else { |
Line 1378 void bdrv_eject(BlockDriverState *bs, in
|
Line 2139 void bdrv_eject(BlockDriverState *bs, in
|
if (ret == -ENOTSUP) { |
if (ret == -ENOTSUP) { |
if (eject_flag) |
if (eject_flag) |
bdrv_close(bs); |
bdrv_close(bs); |
|
ret = 0; |
} |
} |
|
|
|
return ret; |
} |
} |
|
|
int bdrv_is_locked(BlockDriverState *bs) |
int bdrv_is_locked(BlockDriverState *bs) |
Line 1410 int bdrv_ioctl(BlockDriverState *bs, uns
|
Line 2174 int bdrv_ioctl(BlockDriverState *bs, uns
|
return drv->bdrv_ioctl(bs, req, buf); |
return drv->bdrv_ioctl(bs, req, buf); |
return -ENOTSUP; |
return -ENOTSUP; |
} |
} |
|
|
|
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
|
unsigned long int req, void *buf, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
|
|
if (drv && drv->bdrv_aio_ioctl) |
|
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); |
|
return NULL; |
|
} |
|
|
|
|
|
|
|
void *qemu_blockalign(BlockDriverState *bs, size_t size) |
|
{ |
|
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
|
} |
|
|
|
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
|
{ |
|
int64_t bitmap_size; |
|
|
|
if (enable) { |
|
if (!bs->dirty_bitmap) { |
|
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
|
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
|
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; |
|
|
|
bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
|
} |
|
} else { |
|
if (bs->dirty_bitmap) { |
|
qemu_free(bs->dirty_bitmap); |
|
bs->dirty_bitmap = NULL; |
|
} |
|
} |
|
} |
|
|
|
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) |
|
{ |
|
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
|
|
|
if (bs->dirty_bitmap && |
|
(sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { |
|
return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
|
(1 << (chunk % (sizeof(unsigned long) * 8))); |
|
} else { |
|
return 0; |
|
} |
|
} |
|
|
|
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
|
int nr_sectors) |
|
{ |
|
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); |
|
} |