version 1.1.1.9, 2018/04/24 17:01:52
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version 1.1.1.22, 2018/04/24 19:17:20
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Line 22
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Line 22
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* THE SOFTWARE. |
* THE SOFTWARE. |
*/ |
*/ |
#include "config-host.h" |
#include "config-host.h" |
#ifdef _BSD |
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/* include native header before sys-queue.h */ |
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#include <sys/queue.h> |
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#endif |
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#include "qemu-common.h" |
#include "qemu-common.h" |
#include "console.h" |
#include "trace.h" |
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#include "monitor.h" |
#include "block_int.h" |
#include "block_int.h" |
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#include "module.h" |
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#include "qjson.h" |
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#include "qemu-coroutine.h" |
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#include "qmp-commands.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> |
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#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 |
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typedef struct BlockDriverAIOCBSync { |
#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
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 void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
int64_t sector_num, uint8_t *buf, int nb_sectors, |
static BlockDriverAIOCB *bdrv_aio_readv_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_writev_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); |
BlockDriverCompletionFunc *cb, void *opaque); |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
int64_t sector_num, int nb_sectors, |
uint8_t *buf, int nb_sectors); |
QEMUIOVector *iov); |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, |
const uint8_t *buf, int nb_sectors); |
int64_t sector_num, int nb_sectors, |
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QEMUIOVector *iov); |
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static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); |
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static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); |
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static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
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int64_t sector_num, |
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QEMUIOVector *qiov, |
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int nb_sectors, |
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BlockDriverCompletionFunc *cb, |
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void *opaque, |
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bool is_write); |
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static void coroutine_fn bdrv_co_do_rw(void *opaque); |
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static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
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QTAILQ_HEAD_INITIALIZER(bdrv_states); |
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static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
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QLIST_HEAD_INITIALIZER(bdrv_drivers); |
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/* The device to use for VM snapshots */ |
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static BlockDriverState *bs_snapshots; |
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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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#ifdef _WIN32 |
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static int is_windows_drive_prefix(const char *filename) |
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{ |
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return (((filename[0] >= 'a' && filename[0] <= 'z') || |
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(filename[0] >= 'A' && filename[0] <= 'Z')) && |
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filename[1] == ':'); |
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} |
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|
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int is_windows_drive(const char *filename) |
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{ |
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if (is_windows_drive_prefix(filename) && |
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filename[2] == '\0') |
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return 1; |
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if (strstart(filename, "\\\\.\\", NULL) || |
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strstart(filename, "//./", NULL)) |
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return 1; |
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return 0; |
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} |
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#endif |
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BlockDriverState *bdrv_first; |
/* check if the path starts with "<protocol>:" */ |
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static int path_has_protocol(const char *path) |
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{ |
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#ifdef _WIN32 |
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if (is_windows_drive(path) || |
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is_windows_drive_prefix(path)) { |
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return 0; |
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} |
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#endif |
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static BlockDriver *first_drv; |
return strchr(path, ':') != NULL; |
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} |
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int path_is_absolute(const char *path) |
int path_is_absolute(const char *path) |
{ |
{ |
Line 127 void path_combine(char *dest, int dest_s
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Line 182 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) { |
/* Block drivers without coroutine functions need emulation */ |
/* add AIO emulation layer */ |
if (!bdrv->bdrv_co_readv) { |
bdrv->bdrv_aio_read = bdrv_aio_read_em; |
bdrv->bdrv_co_readv = bdrv_co_readv_em; |
bdrv->bdrv_aio_write = bdrv_aio_write_em; |
bdrv->bdrv_co_writev = bdrv_co_writev_em; |
bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; |
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bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync); |
/* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
} else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { |
* the block driver lacks aio we need to emulate that too. |
/* add synchronous IO emulation layer */ |
*/ |
bdrv->bdrv_read = bdrv_read_em; |
if (!bdrv->bdrv_aio_readv) { |
bdrv->bdrv_write = bdrv_write_em; |
/* add AIO emulation layer */ |
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bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
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bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
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} |
} |
} |
bdrv->next = first_drv; |
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first_drv = bdrv; |
QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
} |
} |
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/* create a new block device (by default it is empty) */ |
/* create a new block device (by default it is empty) */ |
BlockDriverState *bdrv_new(const char *device_name) |
BlockDriverState *bdrv_new(const char *device_name) |
{ |
{ |
BlockDriverState **pbs, *bs; |
BlockDriverState *bs; |
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bs = qemu_mallocz(sizeof(BlockDriverState)); |
bs = g_malloc0(sizeof(BlockDriverState)); |
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 */ |
QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
pbs = &bdrv_first; |
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while (*pbs != NULL) |
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pbs = &(*pbs)->next; |
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*pbs = bs; |
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} |
} |
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bdrv_iostatus_disable(bs); |
return bs; |
return bs; |
} |
} |
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BlockDriver *bdrv_find_format(const char *format_name) |
BlockDriver *bdrv_find_format(const char *format_name) |
{ |
{ |
BlockDriver *drv1; |
BlockDriver *drv1; |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
if (!strcmp(drv1->format_name, format_name)) |
if (!strcmp(drv1->format_name, format_name)) { |
return drv1; |
return drv1; |
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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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} |
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int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
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{ |
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BlockDriver *drv; |
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drv = bdrv_find_protocol(filename); |
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if (drv == NULL) { |
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return -ENOENT; |
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} |
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return bdrv_create(drv, filename, options); |
} |
} |
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#ifdef _WIN32 |
#ifdef _WIN32 |
Line 204 void get_tmp_filename(char *filename, in
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Line 295 void get_tmp_filename(char *filename, in
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} |
} |
#endif |
#endif |
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#ifdef _WIN32 |
/* |
static int is_windows_drive_prefix(const char *filename) |
* 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) |
{ |
{ |
return (((filename[0] >= 'a' && filename[0] <= 'z') || |
int score_max = 0, score; |
(filename[0] >= 'A' && filename[0] <= 'Z')) && |
BlockDriver *drv = NULL, *d; |
filename[1] == ':'); |
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} |
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static int is_windows_drive(const char *filename) |
QLIST_FOREACH(d, &bdrv_drivers, list) { |
{ |
if (d->bdrv_probe_device) { |
if (is_windows_drive_prefix(filename) && |
score = d->bdrv_probe_device(filename); |
filename[2] == '\0') |
if (score > score_max) { |
return 1; |
score_max = score; |
if (strstart(filename, "\\\\.\\", NULL) || |
drv = d; |
strstart(filename, "//./", NULL)) |
} |
return 1; |
} |
return 0; |
} |
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return drv; |
} |
} |
#endif |
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static BlockDriver *find_protocol(const char *filename) |
BlockDriver *bdrv_find_protocol(const char *filename) |
{ |
{ |
BlockDriver *drv1; |
BlockDriver *drv1; |
char protocol[128]; |
char protocol[128]; |
int len; |
int len; |
const char *p; |
const char *p; |
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#ifdef _WIN32 |
/* TODO Drivers without bdrv_file_open must be specified explicitly */ |
if (is_windows_drive(filename) || |
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is_windows_drive_prefix(filename)) |
/* |
return &bdrv_raw; |
* XXX(hch): we really should not let host device detection |
#endif |
* override an explicit protocol specification, but moving this |
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* later breaks access to device names with colons in them. |
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* Thanks to the brain-dead persistent naming schemes on udev- |
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* based Linux systems those actually are quite common. |
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*/ |
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drv1 = find_hdev_driver(filename); |
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if (drv1) { |
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return drv1; |
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} |
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if (!path_has_protocol(filename)) { |
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return bdrv_find_format("file"); |
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} |
p = strchr(filename, ':'); |
p = strchr(filename, ':'); |
if (!p) |
assert(p != NULL); |
return &bdrv_raw; |
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len = p - filename; |
len = p - filename; |
if (len > sizeof(protocol) - 1) |
if (len > sizeof(protocol) - 1) |
len = sizeof(protocol) - 1; |
len = sizeof(protocol) - 1; |
memcpy(protocol, filename, len); |
memcpy(protocol, filename, len); |
protocol[len] = '\0'; |
protocol[len] = '\0'; |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
if (drv1->protocol_name && |
if (drv1->protocol_name && |
!strcmp(drv1->protocol_name, protocol)) |
!strcmp(drv1->protocol_name, protocol)) { |
return drv1; |
return drv1; |
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} |
} |
} |
return NULL; |
return NULL; |
} |
} |
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/* XXX: force raw format if block or character device ? It would |
static int find_image_format(const char *filename, BlockDriver **pdrv) |
simplify the BSD case */ |
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static BlockDriver *find_image_format(const char *filename) |
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{ |
{ |
int ret, score, score_max; |
int ret, score, score_max; |
BlockDriver *drv1, *drv; |
BlockDriver *drv1, *drv; |
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 |
ret = bdrv_file_open(&bs, filename, 0); |
recognized as a host CDROM */ |
if (ret < 0) { |
if (strstart(filename, "/dev/cdrom", NULL)) |
*pdrv = NULL; |
return &bdrv_host_device; |
return ret; |
#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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} |
} |
#endif |
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drv = find_protocol(filename); |
/* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
/* no need to test disk image formats for vvfat */ |
if (bs->sg || !bdrv_is_inserted(bs)) { |
if (drv == &bdrv_vvfat) |
bdrv_delete(bs); |
return drv; |
drv = bdrv_find_format("raw"); |
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if (!drv) { |
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ret = -ENOENT; |
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} |
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*pdrv = drv; |
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return ret; |
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} |
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ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
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if (ret < 0) |
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return NULL; |
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ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
bdrv_delete(bs); |
bdrv_delete(bs); |
if (ret < 0) { |
if (ret < 0) { |
return NULL; |
*pdrv = NULL; |
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return ret; |
} |
} |
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score_max = 0; |
score_max = 0; |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
drv = NULL; |
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QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
if (drv1->bdrv_probe) { |
if (drv1->bdrv_probe) { |
score = drv1->bdrv_probe(buf, ret, filename); |
score = drv1->bdrv_probe(buf, ret, filename); |
if (score > score_max) { |
if (score > score_max) { |
Line 302 static BlockDriver *find_image_format(co
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Line 399 static BlockDriver *find_image_format(co
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} |
} |
} |
} |
} |
} |
return drv; |
if (!drv) { |
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ret = -ENOENT; |
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} |
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*pdrv = drv; |
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return ret; |
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} |
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/** |
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* Set the current 'total_sectors' value |
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*/ |
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static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
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{ |
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BlockDriver *drv = bs->drv; |
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|
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/* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
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if (bs->sg) |
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return 0; |
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/* query actual device if possible, otherwise just trust the hint */ |
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if (drv->bdrv_getlength) { |
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int64_t length = drv->bdrv_getlength(bs); |
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if (length < 0) { |
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return length; |
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} |
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hint = length >> BDRV_SECTOR_BITS; |
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} |
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bs->total_sectors = hint; |
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return 0; |
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} |
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/** |
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* Set open flags for a given cache mode |
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* |
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* Return 0 on success, -1 if the cache mode was invalid. |
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*/ |
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int bdrv_parse_cache_flags(const char *mode, int *flags) |
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{ |
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*flags &= ~BDRV_O_CACHE_MASK; |
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|
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if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
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*flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; |
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} else if (!strcmp(mode, "directsync")) { |
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*flags |= BDRV_O_NOCACHE; |
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} else if (!strcmp(mode, "writeback")) { |
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*flags |= BDRV_O_CACHE_WB; |
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} else if (!strcmp(mode, "unsafe")) { |
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*flags |= BDRV_O_CACHE_WB; |
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*flags |= BDRV_O_NO_FLUSH; |
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} else if (!strcmp(mode, "writethrough")) { |
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/* this is the default */ |
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} else { |
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return -1; |
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} |
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return 0; |
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} |
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/* |
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* Common part for opening disk images and files |
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*/ |
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static int bdrv_open_common(BlockDriverState *bs, const char *filename, |
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int flags, BlockDriver *drv) |
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{ |
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int ret, open_flags; |
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assert(drv != NULL); |
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trace_bdrv_open_common(bs, filename, flags, drv->format_name); |
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bs->file = NULL; |
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bs->total_sectors = 0; |
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bs->encrypted = 0; |
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bs->valid_key = 0; |
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bs->sg = 0; |
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bs->open_flags = flags; |
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bs->growable = 0; |
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bs->buffer_alignment = 512; |
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pstrcpy(bs->filename, sizeof(bs->filename), filename); |
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bs->backing_file[0] = '\0'; |
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if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { |
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return -ENOTSUP; |
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} |
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bs->drv = drv; |
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bs->opaque = g_malloc0(drv->instance_size); |
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bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
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/* |
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* Clear flags that are internal to the block layer before opening the |
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* image. |
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*/ |
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open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
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/* |
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* Snapshots should be writable. |
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*/ |
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if (bs->is_temporary) { |
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open_flags |= BDRV_O_RDWR; |
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} |
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bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
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/* Open the image, either directly or using a protocol */ |
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if (drv->bdrv_file_open) { |
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ret = drv->bdrv_file_open(bs, filename, open_flags); |
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} else { |
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ret = bdrv_file_open(&bs->file, filename, open_flags); |
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if (ret >= 0) { |
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ret = drv->bdrv_open(bs, open_flags); |
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} |
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} |
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if (ret < 0) { |
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goto free_and_fail; |
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} |
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ret = refresh_total_sectors(bs, bs->total_sectors); |
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if (ret < 0) { |
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goto free_and_fail; |
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} |
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#ifndef _WIN32 |
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if (bs->is_temporary) { |
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unlink(filename); |
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} |
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#endif |
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return 0; |
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free_and_fail: |
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if (bs->file) { |
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bdrv_delete(bs->file); |
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bs->file = NULL; |
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} |
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g_free(bs->opaque); |
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bs->opaque = NULL; |
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bs->drv = NULL; |
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return ret; |
} |
} |
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/* |
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* Opens a file using a protocol (file, host_device, nbd, ...) |
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*/ |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
{ |
{ |
BlockDriverState *bs; |
BlockDriverState *bs; |
|
BlockDriver *drv; |
int ret; |
int ret; |
|
|
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drv = bdrv_find_protocol(filename); |
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if (!drv) { |
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return -ENOENT; |
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} |
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bs = bdrv_new(""); |
bs = bdrv_new(""); |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); |
ret = bdrv_open_common(bs, filename, flags, drv); |
if (ret < 0) { |
if (ret < 0) { |
bdrv_delete(bs); |
bdrv_delete(bs); |
return ret; |
return ret; |
Line 321 int bdrv_file_open(BlockDriverState **pb
|
Line 567 int bdrv_file_open(BlockDriverState **pb
|
return 0; |
return 0; |
} |
} |
|
|
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
/* |
{ |
* Opens a disk image (raw, qcow2, vmdk, ...) |
return bdrv_open2(bs, filename, flags, NULL); |
*/ |
} |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
|
BlockDriver *drv) |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
|
BlockDriver *drv) |
|
{ |
{ |
int ret, open_flags; |
int ret; |
char tmp_filename[PATH_MAX]; |
char tmp_filename[PATH_MAX]; |
char backing_filename[PATH_MAX]; |
|
|
|
bs->read_only = 0; |
|
bs->is_temporary = 0; |
|
bs->encrypted = 0; |
|
bs->valid_key = 0; |
|
|
|
if (flags & BDRV_O_SNAPSHOT) { |
if (flags & BDRV_O_SNAPSHOT) { |
BlockDriverState *bs1; |
BlockDriverState *bs1; |
int64_t total_size; |
int64_t total_size; |
int is_protocol = 0; |
int is_protocol = 0; |
|
BlockDriver *bdrv_qcow2; |
|
QEMUOptionParameter *options; |
|
char backing_filename[PATH_MAX]; |
|
|
/* 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 */ |
|
|
/* if there is a backing file, use it */ |
/* if there is a backing file, use it */ |
bs1 = bdrv_new(""); |
bs1 = bdrv_new(""); |
ret = bdrv_open(bs1, filename, 0); |
ret = bdrv_open(bs1, filename, 0, drv); |
if (ret < 0) { |
if (ret < 0) { |
bdrv_delete(bs1); |
bdrv_delete(bs1); |
return ret; |
return ret; |
} |
} |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
|
|
if (bs1->drv && bs1->drv->protocol_name) |
if (bs1->drv && bs1->drv->protocol_name) |
is_protocol = 1; |
is_protocol = 1; |
Line 366 int bdrv_open2(BlockDriverState *bs, con
|
Line 607 int bdrv_open2(BlockDriverState *bs, con
|
if (is_protocol) |
if (is_protocol) |
snprintf(backing_filename, sizeof(backing_filename), |
snprintf(backing_filename, sizeof(backing_filename), |
"%s", filename); |
"%s", filename); |
else |
else if (!realpath(filename, backing_filename)) |
realpath(filename, backing_filename); |
return -errno; |
|
|
|
bdrv_qcow2 = bdrv_find_format("qcow2"); |
|
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
|
|
|
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
|
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
|
if (drv) { |
|
set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
|
drv->format_name); |
|
} |
|
|
ret = bdrv_create(&bdrv_qcow2, tmp_filename, |
ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
total_size, backing_filename, 0); |
free_option_parameters(options); |
if (ret < 0) { |
if (ret < 0) { |
return ret; |
return ret; |
} |
} |
|
|
filename = tmp_filename; |
filename = tmp_filename; |
|
drv = bdrv_qcow2; |
bs->is_temporary = 1; |
bs->is_temporary = 1; |
} |
} |
|
|
pstrcpy(bs->filename, sizeof(bs->filename), filename); |
/* Find the right image format driver */ |
if (flags & BDRV_O_FILE) { |
if (!drv) { |
drv = find_protocol(filename); |
ret = find_image_format(filename, &drv); |
} else if (!drv) { |
|
drv = find_image_format(filename); |
|
} |
} |
|
|
if (!drv) { |
if (!drv) { |
ret = -ENOENT; |
|
goto unlink_and_fail; |
goto unlink_and_fail; |
} |
} |
bs->drv = drv; |
|
bs->opaque = qemu_mallocz(drv->instance_size); |
/* Open the image */ |
/* Note: for compatibility, we open disk image files as RDWR, and |
ret = bdrv_open_common(bs, filename, flags, drv); |
RDONLY as fallback */ |
|
if (!(flags & BDRV_O_FILE)) |
|
open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK); |
|
else |
|
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
|
ret = drv->bdrv_open(bs, filename, open_flags); |
|
if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) { |
|
ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
|
bs->read_only = 1; |
|
} |
|
if (ret < 0) { |
if (ret < 0) { |
qemu_free(bs->opaque); |
goto unlink_and_fail; |
bs->opaque = NULL; |
|
bs->drv = NULL; |
|
unlink_and_fail: |
|
if (bs->is_temporary) |
|
unlink(filename); |
|
return ret; |
|
} |
|
if (drv->bdrv_getlength) { |
|
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
|
} |
|
#ifndef _WIN32 |
|
if (bs->is_temporary) { |
|
unlink(filename); |
|
} |
} |
#endif |
|
if (bs->backing_file[0] != '\0') { |
/* If there is a backing file, use it */ |
/* if there is a backing file, use it */ |
if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { |
|
char backing_filename[PATH_MAX]; |
|
int back_flags; |
|
BlockDriver *back_drv = NULL; |
|
|
bs->backing_hd = bdrv_new(""); |
bs->backing_hd = bdrv_new(""); |
path_combine(backing_filename, sizeof(backing_filename), |
|
filename, bs->backing_file); |
if (path_has_protocol(bs->backing_file)) { |
ret = bdrv_open(bs->backing_hd, backing_filename, open_flags); |
pstrcpy(backing_filename, sizeof(backing_filename), |
|
bs->backing_file); |
|
} else { |
|
path_combine(backing_filename, sizeof(backing_filename), |
|
filename, bs->backing_file); |
|
} |
|
|
|
if (bs->backing_format[0] != '\0') { |
|
back_drv = bdrv_find_format(bs->backing_format); |
|
} |
|
|
|
/* backing files always opened read-only */ |
|
back_flags = |
|
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
|
|
|
ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); |
if (ret < 0) { |
if (ret < 0) { |
bdrv_close(bs); |
bdrv_close(bs); |
return ret; |
return ret; |
} |
} |
|
if (bs->is_temporary) { |
|
bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); |
|
} else { |
|
/* base image inherits from "parent" */ |
|
bs->backing_hd->keep_read_only = bs->keep_read_only; |
|
} |
} |
} |
|
|
/* call the change callback */ |
if (!bdrv_key_required(bs)) { |
bs->media_changed = 1; |
bdrv_dev_change_media_cb(bs, true); |
if (bs->change_cb) |
} |
bs->change_cb(bs->change_opaque); |
|
|
|
return 0; |
return 0; |
|
|
|
unlink_and_fail: |
|
if (bs->is_temporary) { |
|
unlink(filename); |
|
} |
|
return ret; |
} |
} |
|
|
void bdrv_close(BlockDriverState *bs) |
void bdrv_close(BlockDriverState *bs) |
{ |
{ |
if (bs->drv) { |
if (bs->drv) { |
if (bs->backing_hd) |
if (bs == bs_snapshots) { |
|
bs_snapshots = NULL; |
|
} |
|
if (bs->backing_hd) { |
bdrv_delete(bs->backing_hd); |
bdrv_delete(bs->backing_hd); |
|
bs->backing_hd = NULL; |
|
} |
bs->drv->bdrv_close(bs); |
bs->drv->bdrv_close(bs); |
qemu_free(bs->opaque); |
g_free(bs->opaque); |
#ifdef _WIN32 |
#ifdef _WIN32 |
if (bs->is_temporary) { |
if (bs->is_temporary) { |
unlink(bs->filename); |
unlink(bs->filename); |
Line 453 void bdrv_close(BlockDriverState *bs)
|
Line 716 void bdrv_close(BlockDriverState *bs)
|
bs->opaque = NULL; |
bs->opaque = NULL; |
bs->drv = NULL; |
bs->drv = NULL; |
|
|
/* call the change callback */ |
if (bs->file != NULL) { |
bs->media_changed = 1; |
bdrv_close(bs->file); |
if (bs->change_cb) |
} |
bs->change_cb(bs->change_opaque); |
|
|
bdrv_dev_change_media_cb(bs, false); |
} |
} |
} |
} |
|
|
void bdrv_delete(BlockDriverState *bs) |
void bdrv_close_all(void) |
{ |
{ |
BlockDriverState **pbs; |
BlockDriverState *bs; |
|
|
pbs = &bdrv_first; |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
while (*pbs != bs && *pbs != NULL) |
bdrv_close(bs); |
pbs = &(*pbs)->next; |
} |
if (*pbs == bs) |
} |
*pbs = bs->next; |
|
|
|
bdrv_close(bs); |
/* make a BlockDriverState anonymous by removing from bdrv_state list. |
qemu_free(bs); |
Also, NULL terminate the device_name to prevent double remove */ |
|
void bdrv_make_anon(BlockDriverState *bs) |
|
{ |
|
if (bs->device_name[0] != '\0') { |
|
QTAILQ_REMOVE(&bdrv_states, bs, list); |
|
} |
|
bs->device_name[0] = '\0'; |
} |
} |
|
|
/* commit COW file into the raw image */ |
void bdrv_delete(BlockDriverState *bs) |
int bdrv_commit(BlockDriverState *bs) |
|
{ |
{ |
BlockDriver *drv = bs->drv; |
assert(!bs->dev); |
int64_t i, total_sectors; |
|
int n, j; |
|
unsigned char sector[512]; |
|
|
|
if (!drv) |
/* remove from list, if necessary */ |
return -ENOMEDIUM; |
bdrv_make_anon(bs); |
|
|
if (bs->read_only) { |
bdrv_close(bs); |
return -EACCES; |
if (bs->file != NULL) { |
|
bdrv_delete(bs->file); |
|
} |
|
|
|
assert(bs != bs_snapshots); |
|
g_free(bs); |
|
} |
|
|
|
int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
|
/* TODO change to DeviceState *dev when all users are qdevified */ |
|
{ |
|
if (bs->dev) { |
|
return -EBUSY; |
|
} |
|
bs->dev = dev; |
|
bdrv_iostatus_reset(bs); |
|
return 0; |
|
} |
|
|
|
/* TODO qdevified devices don't use this, remove when devices are qdevified */ |
|
void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) |
|
{ |
|
if (bdrv_attach_dev(bs, dev) < 0) { |
|
abort(); |
|
} |
|
} |
|
|
|
void bdrv_detach_dev(BlockDriverState *bs, void *dev) |
|
/* TODO change to DeviceState *dev when all users are qdevified */ |
|
{ |
|
assert(bs->dev == dev); |
|
bs->dev = NULL; |
|
bs->dev_ops = NULL; |
|
bs->dev_opaque = NULL; |
|
bs->buffer_alignment = 512; |
|
} |
|
|
|
/* TODO change to return DeviceState * when all users are qdevified */ |
|
void *bdrv_get_attached_dev(BlockDriverState *bs) |
|
{ |
|
return bs->dev; |
|
} |
|
|
|
void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
|
void *opaque) |
|
{ |
|
bs->dev_ops = ops; |
|
bs->dev_opaque = opaque; |
|
if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) { |
|
bs_snapshots = NULL; |
|
} |
|
} |
|
|
|
static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
|
{ |
|
if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
|
bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
|
} |
|
} |
|
|
|
bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
|
{ |
|
return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); |
|
} |
|
|
|
void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
|
{ |
|
if (bs->dev_ops && bs->dev_ops->eject_request_cb) { |
|
bs->dev_ops->eject_request_cb(bs->dev_opaque, force); |
|
} |
|
} |
|
|
|
bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
|
{ |
|
if (bs->dev_ops && bs->dev_ops->is_tray_open) { |
|
return bs->dev_ops->is_tray_open(bs->dev_opaque); |
|
} |
|
return false; |
|
} |
|
|
|
static void bdrv_dev_resize_cb(BlockDriverState *bs) |
|
{ |
|
if (bs->dev_ops && bs->dev_ops->resize_cb) { |
|
bs->dev_ops->resize_cb(bs->dev_opaque); |
|
} |
|
} |
|
|
|
bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
|
{ |
|
if (bs->dev_ops && bs->dev_ops->is_medium_locked) { |
|
return bs->dev_ops->is_medium_locked(bs->dev_opaque); |
|
} |
|
return false; |
|
} |
|
|
|
/* |
|
* Run consistency checks on an image |
|
* |
|
* Returns 0 if the check could be completed (it doesn't mean that the image is |
|
* free of errors) or -errno when an internal error occurred. The results of the |
|
* check are stored in res. |
|
*/ |
|
int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res) |
|
{ |
|
if (bs->drv->bdrv_check == NULL) { |
|
return -ENOTSUP; |
} |
} |
|
|
|
memset(res, 0, sizeof(*res)); |
|
return bs->drv->bdrv_check(bs, res); |
|
} |
|
|
|
#define COMMIT_BUF_SECTORS 2048 |
|
|
|
/* commit COW file into the raw image */ |
|
int bdrv_commit(BlockDriverState *bs) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
BlockDriver *backing_drv; |
|
int64_t sector, total_sectors; |
|
int n, ro, open_flags; |
|
int ret = 0, rw_ret = 0; |
|
uint8_t *buf; |
|
char filename[1024]; |
|
BlockDriverState *bs_rw, *bs_ro; |
|
|
|
if (!drv) |
|
return -ENOMEDIUM; |
|
|
if (!bs->backing_hd) { |
if (!bs->backing_hd) { |
return -ENOTSUP; |
return -ENOTSUP; |
} |
} |
|
|
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
if (bs->backing_hd->keep_read_only) { |
for (i = 0; i < total_sectors;) { |
return -EACCES; |
if (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) { |
backing_drv = bs->backing_hd->drv; |
return -EIO; |
ro = bs->backing_hd->read_only; |
} |
strncpy(filename, bs->backing_hd->filename, sizeof(filename)); |
i++; |
open_flags = bs->backing_hd->open_flags; |
} |
|
} else { |
if (ro) { |
i += n; |
/* re-open as RW */ |
|
bdrv_delete(bs->backing_hd); |
|
bs->backing_hd = NULL; |
|
bs_rw = bdrv_new(""); |
|
rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, |
|
backing_drv); |
|
if (rw_ret < 0) { |
|
bdrv_delete(bs_rw); |
|
/* try to re-open read-only */ |
|
bs_ro = bdrv_new(""); |
|
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
|
backing_drv); |
|
if (ret < 0) { |
|
bdrv_delete(bs_ro); |
|
/* drive not functional anymore */ |
|
bs->drv = NULL; |
|
return ret; |
|
} |
|
bs->backing_hd = bs_ro; |
|
return rw_ret; |
} |
} |
|
bs->backing_hd = bs_rw; |
} |
} |
|
|
if (drv->bdrv_make_empty) |
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
return drv->bdrv_make_empty(bs); |
buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
|
|
return 0; |
for (sector = 0; sector < total_sectors; sector += n) { |
|
if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { |
|
|
|
if (bdrv_read(bs, sector, buf, n) != 0) { |
|
ret = -EIO; |
|
goto ro_cleanup; |
|
} |
|
|
|
if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { |
|
ret = -EIO; |
|
goto ro_cleanup; |
|
} |
|
} |
|
} |
|
|
|
if (drv->bdrv_make_empty) { |
|
ret = drv->bdrv_make_empty(bs); |
|
bdrv_flush(bs); |
|
} |
|
|
|
/* |
|
* Make sure all data we wrote to the backing device is actually |
|
* stable on disk. |
|
*/ |
|
if (bs->backing_hd) |
|
bdrv_flush(bs->backing_hd); |
|
|
|
ro_cleanup: |
|
g_free(buf); |
|
|
|
if (ro) { |
|
/* re-open as RO */ |
|
bdrv_delete(bs->backing_hd); |
|
bs->backing_hd = NULL; |
|
bs_ro = bdrv_new(""); |
|
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
|
backing_drv); |
|
if (ret < 0) { |
|
bdrv_delete(bs_ro); |
|
/* drive not functional anymore */ |
|
bs->drv = NULL; |
|
return ret; |
|
} |
|
bs->backing_hd = bs_ro; |
|
bs->backing_hd->keep_read_only = 0; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
void bdrv_commit_all(void) |
|
{ |
|
BlockDriverState *bs; |
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
|
bdrv_commit(bs); |
|
} |
|
} |
|
|
|
/* |
|
* Return values: |
|
* 0 - success |
|
* -EINVAL - backing format specified, but no file |
|
* -ENOSPC - can't update the backing file because no space is left in the |
|
* image file header |
|
* -ENOTSUP - format driver doesn't support changing the backing file |
|
*/ |
|
int bdrv_change_backing_file(BlockDriverState *bs, |
|
const char *backing_file, const char *backing_fmt) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
|
|
if (drv->bdrv_change_backing_file != NULL) { |
|
return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
|
} else { |
|
return -ENOTSUP; |
|
} |
} |
} |
|
|
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
Line 530 static int bdrv_check_byte_request(Block
|
Line 1013 static int bdrv_check_byte_request(Block
|
|
|
len = bdrv_getlength(bs); |
len = bdrv_getlength(bs); |
|
|
if ((offset + size) > len) |
if (offset < 0) |
|
return -EIO; |
|
|
|
if ((offset > len) || (len - offset < size)) |
return -EIO; |
return -EIO; |
|
|
return 0; |
return 0; |
Line 539 static int bdrv_check_byte_request(Block
|
Line 1025 static int bdrv_check_byte_request(Block
|
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
int nb_sectors) |
int nb_sectors) |
{ |
{ |
int64_t offset; |
return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
|
nb_sectors * BDRV_SECTOR_SIZE); |
|
} |
|
|
/* Deal with byte accesses */ |
typedef struct RwCo { |
if (sector_num < 0) |
BlockDriverState *bs; |
offset = -sector_num; |
int64_t sector_num; |
else |
int nb_sectors; |
offset = sector_num * 512; |
QEMUIOVector *qiov; |
|
bool is_write; |
|
int ret; |
|
} RwCo; |
|
|
|
static void coroutine_fn bdrv_rw_co_entry(void *opaque) |
|
{ |
|
RwCo *rwco = opaque; |
|
|
|
if (!rwco->is_write) { |
|
rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, |
|
rwco->nb_sectors, rwco->qiov); |
|
} else { |
|
rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, |
|
rwco->nb_sectors, rwco->qiov); |
|
} |
|
} |
|
|
return bdrv_check_byte_request(bs, offset, nb_sectors * 512); |
/* |
|
* Process a synchronous request using coroutines |
|
*/ |
|
static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, |
|
int nb_sectors, bool is_write) |
|
{ |
|
QEMUIOVector qiov; |
|
struct iovec iov = { |
|
.iov_base = (void *)buf, |
|
.iov_len = nb_sectors * BDRV_SECTOR_SIZE, |
|
}; |
|
Coroutine *co; |
|
RwCo rwco = { |
|
.bs = bs, |
|
.sector_num = sector_num, |
|
.nb_sectors = nb_sectors, |
|
.qiov = &qiov, |
|
.is_write = is_write, |
|
.ret = NOT_DONE, |
|
}; |
|
|
|
qemu_iovec_init_external(&qiov, &iov, 1); |
|
|
|
if (qemu_in_coroutine()) { |
|
/* Fast-path if already in coroutine context */ |
|
bdrv_rw_co_entry(&rwco); |
|
} else { |
|
co = qemu_coroutine_create(bdrv_rw_co_entry); |
|
qemu_coroutine_enter(co, &rwco); |
|
while (rwco.ret == NOT_DONE) { |
|
qemu_aio_wait(); |
|
} |
|
} |
|
return rwco.ret; |
} |
} |
|
|
/* 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) |
{ |
{ |
BlockDriver *drv = bs->drv; |
return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); |
|
} |
|
|
if (!drv) |
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
return -ENOMEDIUM; |
int nb_sectors, int dirty) |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
{ |
return -EIO; |
int64_t start, end; |
|
unsigned long val, idx, bit; |
|
|
if (drv->bdrv_pread) { |
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
int ret, len; |
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
len = nb_sectors * 512; |
|
ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); |
for (; start <= end; start++) { |
if (ret < 0) |
idx = start / (sizeof(unsigned long) * 8); |
return ret; |
bit = start % (sizeof(unsigned long) * 8); |
else if (ret != len) |
val = bs->dirty_bitmap[idx]; |
return -EINVAL; |
if (dirty) { |
else { |
if (!(val & (1UL << bit))) { |
bs->rd_bytes += (unsigned) len; |
bs->dirty_count++; |
bs->rd_ops ++; |
val |= 1UL << bit; |
return 0; |
} |
} |
} else { |
} else { |
if (val & (1UL << bit)) { |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
bs->dirty_count--; |
|
val &= ~(1UL << bit); |
|
} |
|
} |
|
bs->dirty_bitmap[idx] = val; |
} |
} |
} |
} |
|
|
Line 588 int bdrv_read(BlockDriverState *bs, int6
|
Line 1131 int bdrv_read(BlockDriverState *bs, int6
|
int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
const uint8_t *buf, int nb_sectors) |
const uint8_t *buf, int nb_sectors) |
{ |
{ |
BlockDriver *drv = bs->drv; |
return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); |
if (!bs->drv) |
|
return -ENOMEDIUM; |
|
if (bs->read_only) |
|
return -EACCES; |
|
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
|
return -EIO; |
|
|
|
if (drv->bdrv_pwrite) { |
|
int ret, len, count = 0; |
|
len = nb_sectors * 512; |
|
do { |
|
ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len - count); |
|
if (ret < 0) { |
|
printf("bdrv_write ret=%d\n", ret); |
|
return ret; |
|
} |
|
count += ret; |
|
buf += ret; |
|
} while (count != len); |
|
bs->wr_bytes += (unsigned) len; |
|
bs->wr_ops ++; |
|
return 0; |
|
} |
|
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 640 static int bdrv_pread_em(BlockDriverStat
|
Line 1160 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 686 static int bdrv_pwrite_em(BlockDriverSta
|
Line 1207 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) |
|
{ |
|
int ret; |
|
|
|
ret = bdrv_pwrite(bs, offset, buf, count); |
|
if (ret < 0) { |
|
return ret; |
|
} |
|
|
|
/* No flush needed for cache modes that use O_DSYNC */ |
|
if ((bs->open_flags & BDRV_O_CACHE_WB) != 0) { |
|
bdrv_flush(bs); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Handle a read request in coroutine context |
|
*/ |
|
static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
|
|
if (!drv) |
if (!drv) { |
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (bdrv_check_byte_request(bs, offset, count1)) |
} |
|
if (bdrv_check_request(bs, sector_num, nb_sectors)) { |
return -EIO; |
return -EIO; |
|
} |
|
|
if (!drv->bdrv_pread) |
return drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
return bdrv_pread_em(bs, offset, buf1, count1); |
|
return drv->bdrv_pread(bs, offset, buf1, count1); |
|
} |
} |
|
|
/** |
int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
* Write with byte offsets (needed only for file protocols) |
int nb_sectors, QEMUIOVector *qiov) |
|
{ |
|
trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
|
|
|
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov); |
|
} |
|
|
|
/* |
|
* Handle a write request in coroutine context |
*/ |
*/ |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
const void *buf1, int count1) |
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
|
int ret; |
|
|
if (!drv) |
if (!bs->drv) { |
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (bdrv_check_byte_request(bs, offset, count1)) |
} |
|
if (bs->read_only) { |
|
return -EACCES; |
|
} |
|
if (bdrv_check_request(bs, sector_num, nb_sectors)) { |
return -EIO; |
return -EIO; |
|
} |
|
|
|
ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); |
|
|
|
if (bs->dirty_bitmap) { |
|
set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
|
} |
|
|
|
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
|
bs->wr_highest_sector = sector_num + nb_sectors - 1; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
|
int nb_sectors, QEMUIOVector *qiov) |
|
{ |
|
trace_bdrv_co_writev(bs, sector_num, nb_sectors); |
|
|
if (!drv->bdrv_pwrite) |
return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov); |
return bdrv_pwrite_em(bs, offset, buf1, count1); |
|
return drv->bdrv_pwrite(bs, offset, buf1, count1); |
|
} |
} |
|
|
/** |
/** |
Line 749 int bdrv_pwrite(BlockDriverState *bs, in
|
Line 1324 int bdrv_pwrite(BlockDriverState *bs, in
|
int bdrv_truncate(BlockDriverState *bs, int64_t offset) |
int bdrv_truncate(BlockDriverState *bs, int64_t offset) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
|
int ret; |
if (!drv) |
if (!drv) |
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (!drv->bdrv_truncate) |
if (!drv->bdrv_truncate) |
return -ENOTSUP; |
return -ENOTSUP; |
return drv->bdrv_truncate(bs, offset); |
if (bs->read_only) |
|
return -EACCES; |
|
if (bdrv_in_use(bs)) |
|
return -EBUSY; |
|
ret = drv->bdrv_truncate(bs, offset); |
|
if (ret == 0) { |
|
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
|
bdrv_dev_resize_cb(bs); |
|
} |
|
return ret; |
|
} |
|
|
|
/** |
|
* Length of a allocated file in bytes. Sparse files are counted by actual |
|
* allocated space. Return < 0 if error or unknown. |
|
*/ |
|
int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) { |
|
return -ENOMEDIUM; |
|
} |
|
if (drv->bdrv_get_allocated_file_size) { |
|
return drv->bdrv_get_allocated_file_size(bs); |
|
} |
|
if (bs->file) { |
|
return bdrv_get_allocated_file_size(bs->file); |
|
} |
|
return -ENOTSUP; |
} |
} |
|
|
/** |
/** |
Line 764 int64_t bdrv_getlength(BlockDriverState
|
Line 1368 int64_t bdrv_getlength(BlockDriverState
|
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
if (!drv) |
if (!drv) |
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (!drv->bdrv_getlength) { |
|
/* legacy mode */ |
if (bs->growable || bdrv_dev_has_removable_media(bs)) { |
return bs->total_sectors * SECTOR_SIZE; |
if (drv->bdrv_getlength) { |
|
return drv->bdrv_getlength(bs); |
|
} |
} |
} |
return drv->bdrv_getlength(bs); |
return bs->total_sectors * BDRV_SECTOR_SIZE; |
} |
} |
|
|
/* return 0 as number of sectors if no device present or error */ |
/* return 0 as number of sectors if no device present or error */ |
Line 779 void bdrv_get_geometry(BlockDriverState
|
Line 1385 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; |
} |
} |
|
|
Line 794 struct partition {
|
Line 1400 struct partition {
|
uint8_t end_cyl; /* end cylinder */ |
uint8_t end_cyl; /* end cylinder */ |
uint32_t start_sect; /* starting sector counting from 0 */ |
uint32_t start_sect; /* starting sector counting from 0 */ |
uint32_t nr_sects; /* nr of sectors in partition */ |
uint32_t nr_sects; /* nr of sectors in partition */ |
} __attribute__((packed)); |
} QEMU_PACKED; |
|
|
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ |
/* 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, |
static int guess_disk_lchs(BlockDriverState *bs, |
int *pcylinders, int *pheads, int *psectors) |
int *pcylinders, int *pheads, int *psectors) |
{ |
{ |
uint8_t buf[512]; |
uint8_t buf[BDRV_SECTOR_SIZE]; |
int ret, i, heads, sectors, cylinders; |
int ret, i, heads, sectors, cylinders; |
struct partition *p; |
struct partition *p; |
uint32_t nr_sects; |
uint32_t nr_sects; |
Line 907 void bdrv_set_geometry_hint(BlockDriverS
|
Line 1513 void bdrv_set_geometry_hint(BlockDriverS
|
bs->secs = secs; |
bs->secs = secs; |
} |
} |
|
|
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
|
{ |
|
bs->type = type; |
|
bs->removable = ((type == BDRV_TYPE_CDROM || |
|
type == BDRV_TYPE_FLOPPY)); |
|
} |
|
|
|
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
{ |
{ |
bs->translation = translation; |
bs->translation = translation; |
Line 927 void bdrv_get_geometry_hint(BlockDriverS
|
Line 1526 void bdrv_get_geometry_hint(BlockDriverS
|
*psecs = bs->secs; |
*psecs = bs->secs; |
} |
} |
|
|
int bdrv_get_type_hint(BlockDriverState *bs) |
/* Recognize floppy formats */ |
{ |
typedef struct FDFormat { |
return bs->type; |
FDriveType drive; |
|
uint8_t last_sect; |
|
uint8_t max_track; |
|
uint8_t max_head; |
|
} FDFormat; |
|
|
|
static const FDFormat fd_formats[] = { |
|
/* First entry is default format */ |
|
/* 1.44 MB 3"1/2 floppy disks */ |
|
{ FDRIVE_DRV_144, 18, 80, 1, }, |
|
{ FDRIVE_DRV_144, 20, 80, 1, }, |
|
{ FDRIVE_DRV_144, 21, 80, 1, }, |
|
{ FDRIVE_DRV_144, 21, 82, 1, }, |
|
{ FDRIVE_DRV_144, 21, 83, 1, }, |
|
{ FDRIVE_DRV_144, 22, 80, 1, }, |
|
{ FDRIVE_DRV_144, 23, 80, 1, }, |
|
{ FDRIVE_DRV_144, 24, 80, 1, }, |
|
/* 2.88 MB 3"1/2 floppy disks */ |
|
{ FDRIVE_DRV_288, 36, 80, 1, }, |
|
{ FDRIVE_DRV_288, 39, 80, 1, }, |
|
{ FDRIVE_DRV_288, 40, 80, 1, }, |
|
{ FDRIVE_DRV_288, 44, 80, 1, }, |
|
{ FDRIVE_DRV_288, 48, 80, 1, }, |
|
/* 720 kB 3"1/2 floppy disks */ |
|
{ FDRIVE_DRV_144, 9, 80, 1, }, |
|
{ FDRIVE_DRV_144, 10, 80, 1, }, |
|
{ FDRIVE_DRV_144, 10, 82, 1, }, |
|
{ FDRIVE_DRV_144, 10, 83, 1, }, |
|
{ FDRIVE_DRV_144, 13, 80, 1, }, |
|
{ FDRIVE_DRV_144, 14, 80, 1, }, |
|
/* 1.2 MB 5"1/4 floppy disks */ |
|
{ FDRIVE_DRV_120, 15, 80, 1, }, |
|
{ FDRIVE_DRV_120, 18, 80, 1, }, |
|
{ FDRIVE_DRV_120, 18, 82, 1, }, |
|
{ FDRIVE_DRV_120, 18, 83, 1, }, |
|
{ FDRIVE_DRV_120, 20, 80, 1, }, |
|
/* 720 kB 5"1/4 floppy disks */ |
|
{ FDRIVE_DRV_120, 9, 80, 1, }, |
|
{ FDRIVE_DRV_120, 11, 80, 1, }, |
|
/* 360 kB 5"1/4 floppy disks */ |
|
{ FDRIVE_DRV_120, 9, 40, 1, }, |
|
{ FDRIVE_DRV_120, 9, 40, 0, }, |
|
{ FDRIVE_DRV_120, 10, 41, 1, }, |
|
{ FDRIVE_DRV_120, 10, 42, 1, }, |
|
/* 320 kB 5"1/4 floppy disks */ |
|
{ FDRIVE_DRV_120, 8, 40, 1, }, |
|
{ FDRIVE_DRV_120, 8, 40, 0, }, |
|
/* 360 kB must match 5"1/4 better than 3"1/2... */ |
|
{ FDRIVE_DRV_144, 9, 80, 0, }, |
|
/* end */ |
|
{ FDRIVE_DRV_NONE, -1, -1, 0, }, |
|
}; |
|
|
|
void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, |
|
int *max_track, int *last_sect, |
|
FDriveType drive_in, FDriveType *drive) |
|
{ |
|
const FDFormat *parse; |
|
uint64_t nb_sectors, size; |
|
int i, first_match, match; |
|
|
|
bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); |
|
if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { |
|
/* User defined disk */ |
|
} else { |
|
bdrv_get_geometry(bs, &nb_sectors); |
|
match = -1; |
|
first_match = -1; |
|
for (i = 0; ; i++) { |
|
parse = &fd_formats[i]; |
|
if (parse->drive == FDRIVE_DRV_NONE) { |
|
break; |
|
} |
|
if (drive_in == parse->drive || |
|
drive_in == FDRIVE_DRV_NONE) { |
|
size = (parse->max_head + 1) * parse->max_track * |
|
parse->last_sect; |
|
if (nb_sectors == size) { |
|
match = i; |
|
break; |
|
} |
|
if (first_match == -1) { |
|
first_match = i; |
|
} |
|
} |
|
} |
|
if (match == -1) { |
|
if (first_match == -1) { |
|
match = 1; |
|
} else { |
|
match = first_match; |
|
} |
|
parse = &fd_formats[match]; |
|
} |
|
*nb_heads = parse->max_head + 1; |
|
*max_track = parse->max_track; |
|
*last_sect = parse->last_sect; |
|
*drive = parse->drive; |
|
} |
} |
} |
|
|
int bdrv_get_translation_hint(BlockDriverState *bs) |
int bdrv_get_translation_hint(BlockDriverState *bs) |
Line 937 int bdrv_get_translation_hint(BlockDrive
|
Line 1634 int bdrv_get_translation_hint(BlockDrive
|
return bs->translation; |
return bs->translation; |
} |
} |
|
|
int bdrv_is_removable(BlockDriverState *bs) |
void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, |
|
BlockErrorAction on_write_error) |
{ |
{ |
return bs->removable; |
bs->on_read_error = on_read_error; |
|
bs->on_write_error = on_write_error; |
} |
} |
|
|
int bdrv_is_read_only(BlockDriverState *bs) |
BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) |
{ |
{ |
return bs->read_only; |
return is_read ? bs->on_read_error : bs->on_write_error; |
|
} |
|
|
|
int bdrv_is_read_only(BlockDriverState *bs) |
|
{ |
|
return bs->read_only; |
} |
} |
|
|
int bdrv_is_sg(BlockDriverState *bs) |
int bdrv_is_sg(BlockDriverState *bs) |
Line 952 int bdrv_is_sg(BlockDriverState *bs)
|
Line 1656 int bdrv_is_sg(BlockDriverState *bs)
|
return bs->sg; |
return bs->sg; |
} |
} |
|
|
/* XXX: no longer used */ |
int bdrv_enable_write_cache(BlockDriverState *bs) |
void bdrv_set_change_cb(BlockDriverState *bs, |
|
void (*change_cb)(void *opaque), void *opaque) |
|
{ |
{ |
bs->change_cb = change_cb; |
return bs->enable_write_cache; |
bs->change_opaque = opaque; |
|
} |
} |
|
|
int bdrv_is_encrypted(BlockDriverState *bs) |
int bdrv_is_encrypted(BlockDriverState *bs) |
Line 986 int bdrv_set_key(BlockDriverState *bs, c
|
Line 1687 int bdrv_set_key(BlockDriverState *bs, c
|
if (!bs->encrypted) |
if (!bs->encrypted) |
return 0; |
return 0; |
} |
} |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) |
if (!bs->encrypted) { |
return -1; |
return -EINVAL; |
|
} else if (!bs->drv || !bs->drv->bdrv_set_key) { |
|
return -ENOMEDIUM; |
|
} |
ret = bs->drv->bdrv_set_key(bs, key); |
ret = bs->drv->bdrv_set_key(bs, key); |
bs->valid_key = (ret == 0); |
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 */ |
|
bdrv_dev_change_media_cb(bs, true); |
|
} |
return ret; |
return ret; |
} |
} |
|
|
Line 1007 void bdrv_iterate_format(void (*it)(void
|
Line 1717 void bdrv_iterate_format(void (*it)(void
|
{ |
{ |
BlockDriver *drv; |
BlockDriver *drv; |
|
|
for (drv = first_drv; drv != NULL; drv = drv->next) { |
QLIST_FOREACH(drv, &bdrv_drivers, list) { |
it(opaque, drv->format_name); |
it(opaque, drv->format_name); |
} |
} |
} |
} |
Line 1016 BlockDriverState *bdrv_find(const char *
|
Line 1726 BlockDriverState *bdrv_find(const char *
|
{ |
{ |
BlockDriverState *bs; |
BlockDriverState *bs; |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
if (!strcmp(name, bs->device_name)) |
if (!strcmp(name, bs->device_name)) { |
return bs; |
return bs; |
|
} |
} |
} |
return NULL; |
return NULL; |
} |
} |
|
|
|
BlockDriverState *bdrv_next(BlockDriverState *bs) |
|
{ |
|
if (!bs) { |
|
return QTAILQ_FIRST(&bdrv_states); |
|
} |
|
return QTAILQ_NEXT(bs, list); |
|
} |
|
|
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), 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) { |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
it(opaque, bs); |
it(opaque, bs); |
} |
} |
} |
} |
Line 1037 const char *bdrv_get_device_name(BlockDr
|
Line 1756 const char *bdrv_get_device_name(BlockDr
|
return bs->device_name; |
return bs->device_name; |
} |
} |
|
|
void bdrv_flush(BlockDriverState *bs) |
|
{ |
|
if (bs->drv->bdrv_flush) |
|
bs->drv->bdrv_flush(bs); |
|
if (bs->backing_hd) |
|
bdrv_flush(bs->backing_hd); |
|
} |
|
|
|
void bdrv_flush_all(void) |
void bdrv_flush_all(void) |
{ |
{ |
BlockDriverState *bs; |
BlockDriverState *bs; |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
if (bs->drv && !bdrv_is_read_only(bs) && |
if (!bdrv_is_read_only(bs) && bdrv_is_inserted(bs)) { |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
|
bdrv_flush(bs); |
bdrv_flush(bs); |
|
} |
|
} |
|
} |
|
|
|
int bdrv_has_zero_init(BlockDriverState *bs) |
|
{ |
|
assert(bs->drv); |
|
|
|
if (bs->drv->bdrv_has_zero_init) { |
|
return bs->drv->bdrv_has_zero_init(bs); |
|
} |
|
|
|
return 1; |
} |
} |
|
|
/* |
/* |
Line 1082 int bdrv_is_allocated(BlockDriverState *
|
Line 1805 int bdrv_is_allocated(BlockDriverState *
|
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); |
} |
} |
|
|
void bdrv_info(void) |
void bdrv_mon_event(const BlockDriverState *bdrv, |
|
BlockMonEventAction action, int is_read) |
|
{ |
|
QObject *data; |
|
const char *action_str; |
|
|
|
switch (action) { |
|
case BDRV_ACTION_REPORT: |
|
action_str = "report"; |
|
break; |
|
case BDRV_ACTION_IGNORE: |
|
action_str = "ignore"; |
|
break; |
|
case BDRV_ACTION_STOP: |
|
action_str = "stop"; |
|
break; |
|
default: |
|
abort(); |
|
} |
|
|
|
data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", |
|
bdrv->device_name, |
|
action_str, |
|
is_read ? "read" : "write"); |
|
monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); |
|
|
|
qobject_decref(data); |
|
} |
|
|
|
BlockInfoList *qmp_query_block(Error **errp) |
{ |
{ |
|
BlockInfoList *head = NULL, *cur_item = NULL; |
BlockDriverState *bs; |
BlockDriverState *bs; |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
term_printf("%s:", bs->device_name); |
BlockInfoList *info = g_malloc0(sizeof(*info)); |
term_printf(" type="); |
|
switch(bs->type) { |
info->value = g_malloc0(sizeof(*info->value)); |
case BDRV_TYPE_HD: |
info->value->device = g_strdup(bs->device_name); |
term_printf("hd"); |
info->value->type = g_strdup("unknown"); |
break; |
info->value->locked = bdrv_dev_is_medium_locked(bs); |
case BDRV_TYPE_CDROM: |
info->value->removable = bdrv_dev_has_removable_media(bs); |
term_printf("cdrom"); |
|
break; |
if (bdrv_dev_has_removable_media(bs)) { |
case BDRV_TYPE_FLOPPY: |
info->value->has_tray_open = true; |
term_printf("floppy"); |
info->value->tray_open = bdrv_dev_is_tray_open(bs); |
break; |
} |
} |
|
term_printf(" removable=%d", bs->removable); |
if (bdrv_iostatus_is_enabled(bs)) { |
if (bs->removable) { |
info->value->has_io_status = true; |
term_printf(" locked=%d", bs->locked); |
info->value->io_status = bs->iostatus; |
} |
} |
|
|
if (bs->drv) { |
if (bs->drv) { |
term_printf(" file="); |
info->value->has_inserted = true; |
term_print_filename(bs->filename); |
info->value->inserted = g_malloc0(sizeof(*info->value->inserted)); |
if (bs->backing_file[0] != '\0') { |
info->value->inserted->file = g_strdup(bs->filename); |
term_printf(" backing_file="); |
info->value->inserted->ro = bs->read_only; |
term_print_filename(bs->backing_file); |
info->value->inserted->drv = g_strdup(bs->drv->format_name); |
} |
info->value->inserted->encrypted = bs->encrypted; |
term_printf(" ro=%d", bs->read_only); |
if (bs->backing_file[0]) { |
term_printf(" drv=%s", bs->drv->format_name); |
info->value->inserted->has_backing_file = true; |
term_printf(" encrypted=%d", bdrv_is_encrypted(bs)); |
info->value->inserted->backing_file = g_strdup(bs->backing_file); |
|
} |
|
} |
|
|
|
/* XXX: waiting for the qapi to support GSList */ |
|
if (!cur_item) { |
|
head = cur_item = info; |
} else { |
} else { |
term_printf(" [not inserted]"); |
cur_item->next = info; |
|
cur_item = info; |
} |
} |
term_printf("\n"); |
|
} |
} |
|
|
|
return head; |
|
} |
|
|
|
/* Consider exposing this as a full fledged QMP command */ |
|
static BlockStats *qmp_query_blockstat(const BlockDriverState *bs, Error **errp) |
|
{ |
|
BlockStats *s; |
|
|
|
s = g_malloc0(sizeof(*s)); |
|
|
|
if (bs->device_name[0]) { |
|
s->has_device = true; |
|
s->device = g_strdup(bs->device_name); |
|
} |
|
|
|
s->stats = g_malloc0(sizeof(*s->stats)); |
|
s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ]; |
|
s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE]; |
|
s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ]; |
|
s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE]; |
|
s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE; |
|
s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH]; |
|
s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE]; |
|
s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ]; |
|
s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH]; |
|
|
|
if (bs->file) { |
|
s->has_parent = true; |
|
s->parent = qmp_query_blockstat(bs->file, NULL); |
|
} |
|
|
|
return s; |
} |
} |
|
|
/* The "info blockstats" command. */ |
BlockStatsList *qmp_query_blockstats(Error **errp) |
void bdrv_info_stats (void) |
|
{ |
{ |
|
BlockStatsList *head = NULL, *cur_item = NULL; |
BlockDriverState *bs; |
BlockDriverState *bs; |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
term_printf ("%s:" |
BlockStatsList *info = g_malloc0(sizeof(*info)); |
" rd_bytes=%" PRIu64 |
info->value = qmp_query_blockstat(bs, NULL); |
" wr_bytes=%" PRIu64 |
|
" rd_operations=%" PRIu64 |
/* XXX: waiting for the qapi to support GSList */ |
" wr_operations=%" PRIu64 |
if (!cur_item) { |
"\n", |
head = cur_item = info; |
bs->device_name, |
} else { |
bs->rd_bytes, bs->wr_bytes, |
cur_item->next = info; |
bs->rd_ops, bs->wr_ops); |
cur_item = info; |
|
} |
} |
} |
|
|
|
return head; |
} |
} |
|
|
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
Line 1152 const char *bdrv_get_encrypted_filename(
|
Line 1948 const char *bdrv_get_encrypted_filename(
|
void bdrv_get_backing_filename(BlockDriverState *bs, |
void bdrv_get_backing_filename(BlockDriverState *bs, |
char *filename, int filename_size) |
char *filename, int filename_size) |
{ |
{ |
if (!bs->backing_hd) { |
pstrcpy(filename, filename_size, bs->backing_file); |
pstrcpy(filename, filename_size, ""); |
|
} else { |
|
pstrcpy(filename, filename_size, bs->backing_file); |
|
} |
|
} |
} |
|
|
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
Line 1167 int bdrv_write_compressed(BlockDriverSta
|
Line 1959 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 1181 int bdrv_get_info(BlockDriverState *bs,
|
Line 1980 int bdrv_get_info(BlockDriverState *bs,
|
return drv->bdrv_get_info(bs, bdi); |
return drv->bdrv_get_info(bs, bdi); |
} |
} |
|
|
int bdrv_put_buffer(BlockDriverState *bs, const uint8_t *buf, int64_t pos, int size) |
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
|
int64_t pos, int size) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
if (!drv) |
if (!drv) |
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (!drv->bdrv_put_buffer) |
if (drv->bdrv_save_vmstate) |
return -ENOTSUP; |
return drv->bdrv_save_vmstate(bs, buf, pos, size); |
return drv->bdrv_put_buffer(bs, buf, pos, size); |
if (bs->file) |
|
return bdrv_save_vmstate(bs->file, buf, pos, size); |
|
return -ENOTSUP; |
} |
} |
|
|
int bdrv_get_buffer(BlockDriverState *bs, uint8_t *buf, int64_t pos, int size) |
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
|
int64_t pos, int size) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
if (!drv) |
if (!drv) |
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (!drv->bdrv_get_buffer) |
if (drv->bdrv_load_vmstate) |
return -ENOTSUP; |
return drv->bdrv_load_vmstate(bs, buf, pos, size); |
return drv->bdrv_get_buffer(bs, buf, pos, size); |
if (bs->file) |
|
return bdrv_load_vmstate(bs->file, buf, pos, size); |
|
return -ENOTSUP; |
|
} |
|
|
|
void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
|
|
if (!drv || !drv->bdrv_debug_event) { |
|
return; |
|
} |
|
|
|
return drv->bdrv_debug_event(bs, event); |
|
|
} |
} |
|
|
/**************************************************************/ |
/**************************************************************/ |
/* handling of snapshots */ |
/* handling of snapshots */ |
|
|
|
int bdrv_can_snapshot(BlockDriverState *bs) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
|
return 0; |
|
} |
|
|
|
if (!drv->bdrv_snapshot_create) { |
|
if (bs->file != NULL) { |
|
return bdrv_can_snapshot(bs->file); |
|
} |
|
return 0; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
int bdrv_is_snapshot(BlockDriverState *bs) |
|
{ |
|
return !!(bs->open_flags & BDRV_O_SNAPSHOT); |
|
} |
|
|
|
BlockDriverState *bdrv_snapshots(void) |
|
{ |
|
BlockDriverState *bs; |
|
|
|
if (bs_snapshots) { |
|
return bs_snapshots; |
|
} |
|
|
|
bs = NULL; |
|
while ((bs = bdrv_next(bs))) { |
|
if (bdrv_can_snapshot(bs)) { |
|
bs_snapshots = bs; |
|
return bs; |
|
} |
|
} |
|
return NULL; |
|
} |
|
|
int bdrv_snapshot_create(BlockDriverState *bs, |
int bdrv_snapshot_create(BlockDriverState *bs, |
QEMUSnapshotInfo *sn_info) |
QEMUSnapshotInfo *sn_info) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
if (!drv) |
if (!drv) |
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (!drv->bdrv_snapshot_create) |
if (drv->bdrv_snapshot_create) |
return -ENOTSUP; |
return drv->bdrv_snapshot_create(bs, sn_info); |
return drv->bdrv_snapshot_create(bs, sn_info); |
if (bs->file) |
|
return bdrv_snapshot_create(bs->file, sn_info); |
|
return -ENOTSUP; |
} |
} |
|
|
int bdrv_snapshot_goto(BlockDriverState *bs, |
int bdrv_snapshot_goto(BlockDriverState *bs, |
const char *snapshot_id) |
const char *snapshot_id) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
|
int ret, open_ret; |
|
|
if (!drv) |
if (!drv) |
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (!drv->bdrv_snapshot_goto) |
if (drv->bdrv_snapshot_goto) |
return -ENOTSUP; |
return drv->bdrv_snapshot_goto(bs, snapshot_id); |
return drv->bdrv_snapshot_goto(bs, snapshot_id); |
|
|
if (bs->file) { |
|
drv->bdrv_close(bs); |
|
ret = bdrv_snapshot_goto(bs->file, snapshot_id); |
|
open_ret = drv->bdrv_open(bs, bs->open_flags); |
|
if (open_ret < 0) { |
|
bdrv_delete(bs->file); |
|
bs->drv = NULL; |
|
return open_ret; |
|
} |
|
return ret; |
|
} |
|
|
|
return -ENOTSUP; |
} |
} |
|
|
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
Line 1231 int bdrv_snapshot_delete(BlockDriverStat
|
Line 2105 int bdrv_snapshot_delete(BlockDriverStat
|
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
if (!drv) |
if (!drv) |
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (!drv->bdrv_snapshot_delete) |
if (drv->bdrv_snapshot_delete) |
return -ENOTSUP; |
return drv->bdrv_snapshot_delete(bs, snapshot_id); |
return drv->bdrv_snapshot_delete(bs, snapshot_id); |
if (bs->file) |
|
return bdrv_snapshot_delete(bs->file, snapshot_id); |
|
return -ENOTSUP; |
} |
} |
|
|
int bdrv_snapshot_list(BlockDriverState *bs, |
int bdrv_snapshot_list(BlockDriverState *bs, |
Line 1242 int bdrv_snapshot_list(BlockDriverState
|
Line 2118 int bdrv_snapshot_list(BlockDriverState
|
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
if (!drv) |
if (!drv) |
return -ENOMEDIUM; |
return -ENOMEDIUM; |
if (!drv->bdrv_snapshot_list) |
if (drv->bdrv_snapshot_list) |
return -ENOTSUP; |
return drv->bdrv_snapshot_list(bs, psn_info); |
return drv->bdrv_snapshot_list(bs, psn_info); |
if (bs->file) |
|
return bdrv_snapshot_list(bs->file, psn_info); |
|
return -ENOTSUP; |
|
} |
|
|
|
int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
|
const char *snapshot_name) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) { |
|
return -ENOMEDIUM; |
|
} |
|
if (!bs->read_only) { |
|
return -EINVAL; |
|
} |
|
if (drv->bdrv_snapshot_load_tmp) { |
|
return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); |
|
} |
|
return -ENOTSUP; |
} |
} |
|
|
#define NB_SUFFIXES 4 |
#define NB_SUFFIXES 4 |
Line 1320 char *bdrv_snapshot_dump(char *buf, int
|
Line 2214 char *bdrv_snapshot_dump(char *buf, int
|
return buf; |
return buf; |
} |
} |
|
|
|
|
/**************************************************************/ |
/**************************************************************/ |
/* async I/Os */ |
/* async I/Os */ |
|
|
typedef struct VectorTranslationState { |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
QEMUIOVector *iov; |
QEMUIOVector *qiov, int nb_sectors, |
uint8_t *bounce; |
BlockDriverCompletionFunc *cb, void *opaque) |
int is_write; |
{ |
BlockDriverAIOCB *aiocb; |
trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
BlockDriverAIOCB *this_aiocb; |
|
} VectorTranslationState; |
return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
|
cb, opaque, false); |
|
} |
|
|
static void bdrv_aio_rw_vector_cb(void *opaque, int ret) |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
|
QEMUIOVector *qiov, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
VectorTranslationState *s = opaque; |
trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
|
|
if (!s->is_write) { |
return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
qemu_iovec_from_buffer(s->iov, s->bounce, s->iov->size); |
cb, opaque, true); |
} |
|
qemu_vfree(s->bounce); |
|
s->this_aiocb->cb(s->this_aiocb->opaque, ret); |
|
qemu_aio_release(s->this_aiocb); |
|
} |
} |
|
|
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
|
int64_t sector_num, |
|
QEMUIOVector *iov, |
|
int nb_sectors, |
|
BlockDriverCompletionFunc *cb, |
|
void *opaque, |
|
int is_write) |
|
|
|
|
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) |
{ |
{ |
VectorTranslationState *s = qemu_mallocz(sizeof(*s)); |
int i; |
BlockDriverAIOCB *aiocb = qemu_aio_get(bs, cb, opaque); |
|
|
|
s->this_aiocb = aiocb; |
for (i = 0; i < mcb->num_callbacks; i++) { |
s->iov = iov; |
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
s->bounce = qemu_memalign(512, nb_sectors * 512); |
if (mcb->callbacks[i].free_qiov) { |
s->is_write = is_write; |
qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
if (is_write) { |
} |
qemu_iovec_to_buffer(s->iov, s->bounce); |
g_free(mcb->callbacks[i].free_qiov); |
s->aiocb = bdrv_aio_write(bs, sector_num, s->bounce, nb_sectors, |
qemu_vfree(mcb->callbacks[i].free_buf); |
bdrv_aio_rw_vector_cb, s); |
|
} else { |
|
s->aiocb = bdrv_aio_read(bs, sector_num, s->bounce, nb_sectors, |
|
bdrv_aio_rw_vector_cb, s); |
|
} |
} |
return aiocb; |
|
} |
} |
|
|
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
static void multiwrite_cb(void *opaque, int ret) |
QEMUIOVector *iov, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
|
{ |
{ |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
MultiwriteCB *mcb = opaque; |
return NULL; |
|
|
trace_multiwrite_cb(mcb, ret); |
|
|
|
if (ret < 0 && !mcb->error) { |
|
mcb->error = ret; |
|
} |
|
|
return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors, |
mcb->num_requests--; |
cb, opaque, 0); |
if (mcb->num_requests == 0) { |
|
multiwrite_user_cb(mcb); |
|
g_free(mcb); |
|
} |
} |
} |
|
|
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
static int multiwrite_req_compare(const void *a, const void *b) |
QEMUIOVector *iov, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
|
{ |
{ |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
const BlockRequest *req1 = a, *req2 = b; |
return NULL; |
|
|
|
return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors, |
/* |
cb, opaque, 1); |
* 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; |
|
} |
} |
} |
|
|
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
/* |
uint8_t *buf, int nb_sectors, |
* Takes a bunch of requests and tries to merge them. Returns the number of |
BlockDriverCompletionFunc *cb, void *opaque) |
* requests that remain after merging. |
|
*/ |
|
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
|
int num_reqs, MultiwriteCB *mcb) |
{ |
{ |
BlockDriver *drv = bs->drv; |
int i, outidx; |
BlockDriverAIOCB *ret; |
|
|
|
if (!drv) |
// Sort requests by start sector |
return NULL; |
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
|
return NULL; |
// 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; |
|
} |
|
|
ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
if (merge) { |
|
size_t size; |
|
QEMUIOVector *qiov = g_malloc0(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); |
|
|
if (ret) { |
reqs[outidx].nb_sectors = qiov->size >> 9; |
/* Update stats even though technically transfer has not happened. */ |
reqs[outidx].qiov = qiov; |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE; |
|
bs->rd_ops ++; |
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 ret; |
return outidx + 1; |
} |
} |
|
|
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
/* |
const uint8_t *buf, int nb_sectors, |
* Submit multiple AIO write requests at once. |
BlockDriverCompletionFunc *cb, void *opaque) |
* |
|
* 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) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriverAIOCB *acb; |
BlockDriverAIOCB *ret; |
MultiwriteCB *mcb; |
|
int i; |
|
|
if (!drv) |
/* don't submit writes if we don't have a medium */ |
return NULL; |
if (bs->drv == NULL) { |
if (bs->read_only) |
for (i = 0; i < num_reqs; i++) { |
return NULL; |
reqs[i].error = -ENOMEDIUM; |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
} |
return NULL; |
return -1; |
|
} |
|
|
ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
if (num_reqs == 0) { |
|
return 0; |
|
} |
|
|
if (ret) { |
// Create MultiwriteCB structure |
/* Update stats even though technically transfer has not happened. */ |
mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE; |
mcb->num_requests = 0; |
bs->wr_ops ++; |
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); |
|
|
|
trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
|
|
|
/* |
|
* 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; |
|
|
|
// Run the aio requests |
|
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) { |
|
trace_bdrv_aio_multiwrite_earlyfail(mcb); |
|
goto fail; |
|
} else { |
|
trace_bdrv_aio_multiwrite_latefail(mcb, i); |
|
multiwrite_cb(mcb, -EIO); |
|
break; |
|
} |
|
} |
} |
} |
|
|
return ret; |
/* Complete the dummy request */ |
} |
multiwrite_cb(mcb, 0); |
|
|
void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
return 0; |
{ |
|
BlockDriver *drv = acb->bs->drv; |
|
|
|
if (acb->cb == bdrv_aio_rw_vector_cb) { |
fail: |
VectorTranslationState *s = acb->opaque; |
for (i = 0; i < mcb->num_callbacks; i++) { |
acb = s->aiocb; |
reqs[i].error = -EIO; |
} |
} |
|
g_free(mcb); |
|
return -1; |
|
} |
|
|
drv->bdrv_aio_cancel(acb); |
void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
|
{ |
|
acb->pool->cancel(acb); |
} |
} |
|
|
|
|
/**************************************************************/ |
/**************************************************************/ |
/* async block device emulation */ |
/* 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 = |
|
container_of(blockacb, BlockDriverAIOCBSync, common); |
|
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 = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
|
} else { |
|
acb->ret = bs->drv->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) |
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
BlockDriverAIOCBSync *acb; |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
int ret; |
|
|
|
acb = qemu_aio_get(bs, cb, opaque); |
|
if (!acb->bh) |
|
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
|
ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
|
acb->ret = ret; |
|
qemu_bh_schedule(acb->bh); |
|
return &acb->common; |
|
} |
} |
|
|
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
qemu_bh_cancel(acb->bh); |
|
qemu_aio_release(acb); |
|
} |
} |
|
|
/**************************************************************/ |
|
/* sync block device emulation */ |
|
|
|
static void bdrv_rw_em_cb(void *opaque, int ret) |
typedef struct BlockDriverAIOCBCoroutine { |
|
BlockDriverAIOCB common; |
|
BlockRequest req; |
|
bool is_write; |
|
QEMUBH* bh; |
|
} BlockDriverAIOCBCoroutine; |
|
|
|
static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) |
{ |
{ |
*(int *)opaque = ret; |
qemu_aio_flush(); |
} |
} |
|
|
#define NOT_DONE 0x7fffffff |
static AIOPool bdrv_em_co_aio_pool = { |
|
.aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
|
.cancel = bdrv_aio_co_cancel_em, |
|
}; |
|
|
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
static void bdrv_co_em_bh(void *opaque) |
uint8_t *buf, int nb_sectors) |
|
{ |
{ |
int async_ret; |
BlockDriverAIOCBCoroutine *acb = opaque; |
BlockDriverAIOCB *acb; |
|
|
|
async_ret = NOT_DONE; |
acb->common.cb(acb->common.opaque, acb->req.error); |
acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
qemu_bh_delete(acb->bh); |
bdrv_rw_em_cb, &async_ret); |
qemu_aio_release(acb); |
if (acb == NULL) |
} |
return -1; |
|
|
/* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
|
static void coroutine_fn bdrv_co_do_rw(void *opaque) |
|
{ |
|
BlockDriverAIOCBCoroutine *acb = opaque; |
|
BlockDriverState *bs = acb->common.bs; |
|
|
while (async_ret == NOT_DONE) { |
if (!acb->is_write) { |
qemu_aio_wait(); |
acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, |
|
acb->req.nb_sectors, acb->req.qiov); |
|
} else { |
|
acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, |
|
acb->req.nb_sectors, acb->req.qiov); |
} |
} |
|
|
return async_ret; |
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
|
qemu_bh_schedule(acb->bh); |
|
} |
|
|
|
static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
|
int64_t sector_num, |
|
QEMUIOVector *qiov, |
|
int nb_sectors, |
|
BlockDriverCompletionFunc *cb, |
|
void *opaque, |
|
bool is_write) |
|
{ |
|
Coroutine *co; |
|
BlockDriverAIOCBCoroutine *acb; |
|
|
|
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
|
acb->req.sector = sector_num; |
|
acb->req.nb_sectors = nb_sectors; |
|
acb->req.qiov = qiov; |
|
acb->is_write = is_write; |
|
|
|
co = qemu_coroutine_create(bdrv_co_do_rw); |
|
qemu_coroutine_enter(co, acb); |
|
|
|
return &acb->common; |
} |
} |
|
|
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
const uint8_t *buf, int nb_sectors) |
|
{ |
{ |
int async_ret; |
BlockDriverAIOCBCoroutine *acb = opaque; |
BlockDriverAIOCB *acb; |
BlockDriverState *bs = acb->common.bs; |
|
|
async_ret = NOT_DONE; |
acb->req.error = bdrv_co_flush(bs); |
acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
bdrv_rw_em_cb, &async_ret); |
qemu_bh_schedule(acb->bh); |
if (acb == NULL) |
} |
return -1; |
|
while (async_ret == NOT_DONE) { |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
qemu_aio_wait(); |
BlockDriverCompletionFunc *cb, void *opaque) |
} |
{ |
return async_ret; |
trace_bdrv_aio_flush(bs, opaque); |
|
|
|
Coroutine *co; |
|
BlockDriverAIOCBCoroutine *acb; |
|
|
|
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
|
co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
|
qemu_coroutine_enter(co, acb); |
|
|
|
return &acb->common; |
|
} |
|
|
|
static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
|
{ |
|
BlockDriverAIOCBCoroutine *acb = opaque; |
|
BlockDriverState *bs = acb->common.bs; |
|
|
|
acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); |
|
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
|
qemu_bh_schedule(acb->bh); |
|
} |
|
|
|
BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
|
{ |
|
Coroutine *co; |
|
BlockDriverAIOCBCoroutine *acb; |
|
|
|
trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); |
|
|
|
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
|
acb->req.sector = sector_num; |
|
acb->req.nb_sectors = nb_sectors; |
|
co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
|
qemu_coroutine_enter(co, acb); |
|
|
|
return &acb->common; |
} |
} |
|
|
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); |
|
bdrv_register(&bdrv_nbd); |
|
} |
} |
|
|
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 = g_malloc0(pool->aiocb_size); |
|
acb->pool = pool; |
} |
} |
acb->bs = bs; |
acb->bs = bs; |
acb->cb = cb; |
acb->cb = cb; |
Line 1589 void *qemu_aio_get(BlockDriverState *bs,
|
Line 2718 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; |
|
} |
|
|
|
/**************************************************************/ |
|
/* Coroutine block device emulation */ |
|
|
|
typedef struct CoroutineIOCompletion { |
|
Coroutine *coroutine; |
|
int ret; |
|
} CoroutineIOCompletion; |
|
|
|
static void bdrv_co_io_em_complete(void *opaque, int ret) |
|
{ |
|
CoroutineIOCompletion *co = opaque; |
|
|
|
co->ret = ret; |
|
qemu_coroutine_enter(co->coroutine, NULL); |
|
} |
|
|
|
static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, |
|
int nb_sectors, QEMUIOVector *iov, |
|
bool is_write) |
|
{ |
|
CoroutineIOCompletion co = { |
|
.coroutine = qemu_coroutine_self(), |
|
}; |
|
BlockDriverAIOCB *acb; |
|
|
|
if (is_write) { |
|
acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
|
bdrv_co_io_em_complete, &co); |
|
} else { |
|
acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
|
bdrv_co_io_em_complete, &co); |
|
} |
|
|
|
trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
|
if (!acb) { |
|
return -EIO; |
|
} |
|
qemu_coroutine_yield(); |
|
|
|
return co.ret; |
|
} |
|
|
|
static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, |
|
QEMUIOVector *iov) |
|
{ |
|
return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); |
|
} |
|
|
|
static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, |
|
QEMUIOVector *iov) |
|
{ |
|
return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); |
|
} |
|
|
|
static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
|
{ |
|
RwCo *rwco = opaque; |
|
|
|
rwco->ret = bdrv_co_flush(rwco->bs); |
|
} |
|
|
|
int coroutine_fn bdrv_co_flush(BlockDriverState *bs) |
|
{ |
|
int ret; |
|
|
|
if (!bs->drv) { |
|
return 0; |
|
} |
|
|
|
/* Write back cached data to the OS even with cache=unsafe */ |
|
if (bs->drv->bdrv_co_flush_to_os) { |
|
ret = bs->drv->bdrv_co_flush_to_os(bs); |
|
if (ret < 0) { |
|
return ret; |
|
} |
|
} |
|
|
|
/* But don't actually force it to the disk with cache=unsafe */ |
|
if (bs->open_flags & BDRV_O_NO_FLUSH) { |
|
return 0; |
|
} |
|
|
|
if (bs->drv->bdrv_co_flush_to_disk) { |
|
return bs->drv->bdrv_co_flush_to_disk(bs); |
|
} else if (bs->drv->bdrv_aio_flush) { |
|
BlockDriverAIOCB *acb; |
|
CoroutineIOCompletion co = { |
|
.coroutine = qemu_coroutine_self(), |
|
}; |
|
|
|
acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); |
|
if (acb == NULL) { |
|
return -EIO; |
|
} else { |
|
qemu_coroutine_yield(); |
|
return co.ret; |
|
} |
|
} else { |
|
/* |
|
* Some block drivers always operate in either writethrough or unsafe |
|
* mode and don't support bdrv_flush therefore. Usually qemu doesn't |
|
* know how the server works (because the behaviour is hardcoded or |
|
* depends on server-side configuration), so we can't ensure that |
|
* everything is safe on disk. Returning an error doesn't work because |
|
* that would break guests even if the server operates in writethrough |
|
* mode. |
|
* |
|
* Let's hope the user knows what he's doing. |
|
*/ |
|
return 0; |
|
} |
|
} |
|
|
|
void bdrv_invalidate_cache(BlockDriverState *bs) |
|
{ |
|
if (bs->drv && bs->drv->bdrv_invalidate_cache) { |
|
bs->drv->bdrv_invalidate_cache(bs); |
|
} |
|
} |
|
|
|
void bdrv_invalidate_cache_all(void) |
|
{ |
|
BlockDriverState *bs; |
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
|
bdrv_invalidate_cache(bs); |
|
} |
|
} |
|
|
|
int bdrv_flush(BlockDriverState *bs) |
|
{ |
|
Coroutine *co; |
|
RwCo rwco = { |
|
.bs = bs, |
|
.ret = NOT_DONE, |
|
}; |
|
|
|
if (qemu_in_coroutine()) { |
|
/* Fast-path if already in coroutine context */ |
|
bdrv_flush_co_entry(&rwco); |
|
} else { |
|
co = qemu_coroutine_create(bdrv_flush_co_entry); |
|
qemu_coroutine_enter(co, &rwco); |
|
while (rwco.ret == NOT_DONE) { |
|
qemu_aio_wait(); |
|
} |
|
} |
|
|
|
return rwco.ret; |
|
} |
|
|
|
static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
|
{ |
|
RwCo *rwco = opaque; |
|
|
|
rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); |
|
} |
|
|
|
int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, |
|
int nb_sectors) |
|
{ |
|
if (!bs->drv) { |
|
return -ENOMEDIUM; |
|
} else if (bdrv_check_request(bs, sector_num, nb_sectors)) { |
|
return -EIO; |
|
} else if (bs->read_only) { |
|
return -EROFS; |
|
} else if (bs->drv->bdrv_co_discard) { |
|
return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors); |
|
} else if (bs->drv->bdrv_aio_discard) { |
|
BlockDriverAIOCB *acb; |
|
CoroutineIOCompletion co = { |
|
.coroutine = qemu_coroutine_self(), |
|
}; |
|
|
|
acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, |
|
bdrv_co_io_em_complete, &co); |
|
if (acb == NULL) { |
|
return -EIO; |
|
} else { |
|
qemu_coroutine_yield(); |
|
return co.ret; |
|
} |
|
} else { |
|
return 0; |
|
} |
|
} |
|
|
|
int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) |
|
{ |
|
Coroutine *co; |
|
RwCo rwco = { |
|
.bs = bs, |
|
.sector_num = sector_num, |
|
.nb_sectors = nb_sectors, |
|
.ret = NOT_DONE, |
|
}; |
|
|
|
if (qemu_in_coroutine()) { |
|
/* Fast-path if already in coroutine context */ |
|
bdrv_discard_co_entry(&rwco); |
|
} else { |
|
co = qemu_coroutine_create(bdrv_discard_co_entry); |
|
qemu_coroutine_enter(co, &rwco); |
|
while (rwco.ret == NOT_DONE) { |
|
qemu_aio_wait(); |
|
} |
|
} |
|
|
|
return rwco.ret; |
} |
} |
|
|
/**************************************************************/ |
/**************************************************************/ |
Line 1604 void qemu_aio_release(void *p)
|
Line 2947 void qemu_aio_release(void *p)
|
int bdrv_is_inserted(BlockDriverState *bs) |
int bdrv_is_inserted(BlockDriverState *bs) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
int ret; |
|
if (!drv) |
if (!drv) |
return 0; |
return 0; |
if (!drv->bdrv_is_inserted) |
if (!drv->bdrv_is_inserted) |
return 1; |
return 1; |
ret = drv->bdrv_is_inserted(bs); |
return drv->bdrv_is_inserted(bs); |
return ret; |
|
} |
} |
|
|
/** |
/** |
* Return TRUE if the media changed since the last call to this |
* Return whether the media changed since the last call to this |
* function. It is currently only used for floppy disks |
* function, or -ENOTSUP if we don't know. Most drivers don't know. |
*/ |
*/ |
int bdrv_media_changed(BlockDriverState *bs) |
int bdrv_media_changed(BlockDriverState *bs) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
int ret; |
|
|
|
if (!drv || !drv->bdrv_media_changed) |
if (drv && drv->bdrv_media_changed) { |
ret = -ENOTSUP; |
return drv->bdrv_media_changed(bs); |
else |
} |
ret = drv->bdrv_media_changed(bs); |
return -ENOTSUP; |
if (ret == -ENOTSUP) |
|
ret = bs->media_changed; |
|
bs->media_changed = 0; |
|
return ret; |
|
} |
} |
|
|
/** |
/** |
Line 1638 int bdrv_media_changed(BlockDriverState
|
Line 2975 int bdrv_media_changed(BlockDriverState
|
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
int ret; |
|
|
|
if (!drv || !drv->bdrv_eject) { |
if (drv && drv->bdrv_eject) { |
ret = -ENOTSUP; |
drv->bdrv_eject(bs, eject_flag); |
} else { |
|
ret = drv->bdrv_eject(bs, eject_flag); |
|
} |
|
if (ret == -ENOTSUP) { |
|
if (eject_flag) |
|
bdrv_close(bs); |
|
} |
} |
} |
} |
|
|
int bdrv_is_locked(BlockDriverState *bs) |
|
{ |
|
return bs->locked; |
|
} |
|
|
|
/** |
/** |
* Lock or unlock the media (if it is locked, the user won't be able |
* Lock or unlock the media (if it is locked, the user won't be able |
* to eject it manually). |
* to eject it manually). |
*/ |
*/ |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
|
|
bs->locked = locked; |
trace_bdrv_lock_medium(bs, locked); |
if (drv && drv->bdrv_set_locked) { |
|
drv->bdrv_set_locked(bs, locked); |
if (drv && drv->bdrv_lock_medium) { |
|
drv->bdrv_lock_medium(bs, locked); |
} |
} |
} |
} |
|
|
Line 1680 int bdrv_ioctl(BlockDriverState *bs, uns
|
Line 3006 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 bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
|
{ |
|
bs->buffer_alignment = align; |
|
} |
|
|
|
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; |
|
|
|
bs->dirty_count = 0; |
|
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 = g_malloc0(bitmap_size); |
|
} |
|
} else { |
|
if (bs->dirty_bitmap) { |
|
g_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)] & |
|
(1UL << (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); |
|
} |
|
|
|
int64_t bdrv_get_dirty_count(BlockDriverState *bs) |
|
{ |
|
return bs->dirty_count; |
|
} |
|
|
|
void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
|
{ |
|
assert(bs->in_use != in_use); |
|
bs->in_use = in_use; |
|
} |
|
|
|
int bdrv_in_use(BlockDriverState *bs) |
|
{ |
|
return bs->in_use; |
|
} |
|
|
|
void bdrv_iostatus_enable(BlockDriverState *bs) |
|
{ |
|
bs->iostatus_enabled = true; |
|
bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
|
} |
|
|
|
/* The I/O status is only enabled if the drive explicitly |
|
* enables it _and_ the VM is configured to stop on errors */ |
|
bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) |
|
{ |
|
return (bs->iostatus_enabled && |
|
(bs->on_write_error == BLOCK_ERR_STOP_ENOSPC || |
|
bs->on_write_error == BLOCK_ERR_STOP_ANY || |
|
bs->on_read_error == BLOCK_ERR_STOP_ANY)); |
|
} |
|
|
|
void bdrv_iostatus_disable(BlockDriverState *bs) |
|
{ |
|
bs->iostatus_enabled = false; |
|
} |
|
|
|
void bdrv_iostatus_reset(BlockDriverState *bs) |
|
{ |
|
if (bdrv_iostatus_is_enabled(bs)) { |
|
bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
|
} |
|
} |
|
|
|
/* XXX: Today this is set by device models because it makes the implementation |
|
quite simple. However, the block layer knows about the error, so it's |
|
possible to implement this without device models being involved */ |
|
void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
|
{ |
|
if (bdrv_iostatus_is_enabled(bs) && |
|
bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
|
assert(error >= 0); |
|
bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
|
BLOCK_DEVICE_IO_STATUS_FAILED; |
|
} |
|
} |
|
|
|
void |
|
bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, |
|
enum BlockAcctType type) |
|
{ |
|
assert(type < BDRV_MAX_IOTYPE); |
|
|
|
cookie->bytes = bytes; |
|
cookie->start_time_ns = get_clock(); |
|
cookie->type = type; |
|
} |
|
|
|
void |
|
bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) |
|
{ |
|
assert(cookie->type < BDRV_MAX_IOTYPE); |
|
|
|
bs->nr_bytes[cookie->type] += cookie->bytes; |
|
bs->nr_ops[cookie->type]++; |
|
bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
|
} |
|
|
|
int bdrv_img_create(const char *filename, const char *fmt, |
|
const char *base_filename, const char *base_fmt, |
|
char *options, uint64_t img_size, int flags) |
|
{ |
|
QEMUOptionParameter *param = NULL, *create_options = NULL; |
|
QEMUOptionParameter *backing_fmt, *backing_file, *size; |
|
BlockDriverState *bs = NULL; |
|
BlockDriver *drv, *proto_drv; |
|
BlockDriver *backing_drv = NULL; |
|
int ret = 0; |
|
|
|
/* Find driver and parse its options */ |
|
drv = bdrv_find_format(fmt); |
|
if (!drv) { |
|
error_report("Unknown file format '%s'", fmt); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
proto_drv = bdrv_find_protocol(filename); |
|
if (!proto_drv) { |
|
error_report("Unknown protocol '%s'", filename); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
create_options = append_option_parameters(create_options, |
|
drv->create_options); |
|
create_options = append_option_parameters(create_options, |
|
proto_drv->create_options); |
|
|
|
/* Create parameter list with default values */ |
|
param = parse_option_parameters("", create_options, param); |
|
|
|
set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); |
|
|
|
/* Parse -o options */ |
|
if (options) { |
|
param = parse_option_parameters(options, create_options, param); |
|
if (param == NULL) { |
|
error_report("Invalid options for file format '%s'.", fmt); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
|
|
if (base_filename) { |
|
if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, |
|
base_filename)) { |
|
error_report("Backing file not supported for file format '%s'", |
|
fmt); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
|
|
if (base_fmt) { |
|
if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { |
|
error_report("Backing file format not supported for file " |
|
"format '%s'", fmt); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
|
|
backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
|
if (backing_file && backing_file->value.s) { |
|
if (!strcmp(filename, backing_file->value.s)) { |
|
error_report("Error: Trying to create an image with the " |
|
"same filename as the backing file"); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
|
|
backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
|
if (backing_fmt && backing_fmt->value.s) { |
|
backing_drv = bdrv_find_format(backing_fmt->value.s); |
|
if (!backing_drv) { |
|
error_report("Unknown backing file format '%s'", |
|
backing_fmt->value.s); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
|
|
// The size for the image must always be specified, with one exception: |
|
// If we are using a backing file, we can obtain the size from there |
|
size = get_option_parameter(param, BLOCK_OPT_SIZE); |
|
if (size && size->value.n == -1) { |
|
if (backing_file && backing_file->value.s) { |
|
uint64_t size; |
|
char buf[32]; |
|
|
|
bs = bdrv_new(""); |
|
|
|
ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv); |
|
if (ret < 0) { |
|
error_report("Could not open '%s'", backing_file->value.s); |
|
goto out; |
|
} |
|
bdrv_get_geometry(bs, &size); |
|
size *= 512; |
|
|
|
snprintf(buf, sizeof(buf), "%" PRId64, size); |
|
set_option_parameter(param, BLOCK_OPT_SIZE, buf); |
|
} else { |
|
error_report("Image creation needs a size parameter"); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
|
|
printf("Formatting '%s', fmt=%s ", filename, fmt); |
|
print_option_parameters(param); |
|
puts(""); |
|
|
|
ret = bdrv_create(drv, filename, param); |
|
|
|
if (ret < 0) { |
|
if (ret == -ENOTSUP) { |
|
error_report("Formatting or formatting option not supported for " |
|
"file format '%s'", fmt); |
|
} else if (ret == -EFBIG) { |
|
error_report("The image size is too large for file format '%s'", |
|
fmt); |
|
} else { |
|
error_report("%s: error while creating %s: %s", filename, fmt, |
|
strerror(-ret)); |
|
} |
|
} |
|
|
|
out: |
|
free_option_parameters(create_options); |
|
free_option_parameters(param); |
|
|
|
if (bs) { |
|
bdrv_delete(bs); |
|
} |
|
|
|
return ret; |
|
} |