version 1.1.1.9, 2018/04/24 17:01:52
|
version 1.1.1.23, 2018/04/24 19:34:33
|
Line 22
|
Line 22
|
* THE SOFTWARE. |
* THE SOFTWARE. |
*/ |
*/ |
#include "config-host.h" |
#include "config-host.h" |
#ifdef _BSD |
|
/* include native header before sys-queue.h */ |
|
#include <sys/queue.h> |
|
#endif |
|
|
|
#include "qemu-common.h" |
#include "qemu-common.h" |
#include "console.h" |
#include "trace.h" |
|
#include "monitor.h" |
#include "block_int.h" |
#include "block_int.h" |
|
#include "module.h" |
|
#include "qjson.h" |
|
#include "qemu-coroutine.h" |
|
#include "qmp-commands.h" |
|
#include "qemu-timer.h" |
|
|
#ifdef _BSD |
#ifdef CONFIG_BSD |
#include <sys/types.h> |
#include <sys/types.h> |
#include <sys/stat.h> |
#include <sys/stat.h> |
#include <sys/ioctl.h> |
#include <sys/ioctl.h> |
|
#include <sys/queue.h> |
|
#ifndef __DragonFly__ |
#include <sys/disk.h> |
#include <sys/disk.h> |
#endif |
#endif |
|
#endif |
|
|
#define SECTOR_BITS 9 |
#ifdef _WIN32 |
#define SECTOR_SIZE (1 << SECTOR_BITS) |
#include <windows.h> |
|
#endif |
|
|
typedef struct BlockDriverAIOCBSync { |
#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
BlockDriverAIOCB common; |
|
QEMUBH *bh; |
|
int ret; |
|
} BlockDriverAIOCBSync; |
|
|
|
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
typedef enum { |
int64_t sector_num, uint8_t *buf, int nb_sectors, |
BDRV_REQ_COPY_ON_READ = 0x1, |
|
BDRV_REQ_ZERO_WRITE = 0x2, |
|
} BdrvRequestFlags; |
|
|
|
static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
|
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
|
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, |
|
QEMUIOVector *iov); |
|
static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
|
BdrvRequestFlags flags); |
|
static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
|
BdrvRequestFlags flags); |
|
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); |
|
static void coroutine_fn bdrv_co_do_rw(void *opaque); |
|
static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors); |
|
|
|
static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, |
|
bool is_write, double elapsed_time, uint64_t *wait); |
|
static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, |
|
double elapsed_time, uint64_t *wait); |
|
static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, |
|
bool is_write, int64_t *wait); |
|
|
|
static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
|
QTAILQ_HEAD_INITIALIZER(bdrv_states); |
|
|
BlockDriverState *bdrv_first; |
static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
|
QLIST_HEAD_INITIALIZER(bdrv_drivers); |
|
|
static BlockDriver *first_drv; |
/* The device to use for VM snapshots */ |
|
static BlockDriverState *bs_snapshots; |
|
|
int path_is_absolute(const char *path) |
/* If non-zero, use only whitelisted block drivers */ |
|
static int use_bdrv_whitelist; |
|
|
|
#ifdef _WIN32 |
|
static int is_windows_drive_prefix(const char *filename) |
|
{ |
|
return (((filename[0] >= 'a' && filename[0] <= 'z') || |
|
(filename[0] >= 'A' && filename[0] <= 'Z')) && |
|
filename[1] == ':'); |
|
} |
|
|
|
int is_windows_drive(const char *filename) |
|
{ |
|
if (is_windows_drive_prefix(filename) && |
|
filename[2] == '\0') |
|
return 1; |
|
if (strstart(filename, "\\\\.\\", NULL) || |
|
strstart(filename, "//./", NULL)) |
|
return 1; |
|
return 0; |
|
} |
|
#endif |
|
|
|
/* throttling disk I/O limits */ |
|
void bdrv_io_limits_disable(BlockDriverState *bs) |
|
{ |
|
bs->io_limits_enabled = false; |
|
|
|
while (qemu_co_queue_next(&bs->throttled_reqs)); |
|
|
|
if (bs->block_timer) { |
|
qemu_del_timer(bs->block_timer); |
|
qemu_free_timer(bs->block_timer); |
|
bs->block_timer = NULL; |
|
} |
|
|
|
bs->slice_start = 0; |
|
bs->slice_end = 0; |
|
bs->slice_time = 0; |
|
memset(&bs->io_base, 0, sizeof(bs->io_base)); |
|
} |
|
|
|
static void bdrv_block_timer(void *opaque) |
|
{ |
|
BlockDriverState *bs = opaque; |
|
|
|
qemu_co_queue_next(&bs->throttled_reqs); |
|
} |
|
|
|
void bdrv_io_limits_enable(BlockDriverState *bs) |
|
{ |
|
qemu_co_queue_init(&bs->throttled_reqs); |
|
bs->block_timer = qemu_new_timer_ns(vm_clock, bdrv_block_timer, bs); |
|
bs->slice_time = 5 * BLOCK_IO_SLICE_TIME; |
|
bs->slice_start = qemu_get_clock_ns(vm_clock); |
|
bs->slice_end = bs->slice_start + bs->slice_time; |
|
memset(&bs->io_base, 0, sizeof(bs->io_base)); |
|
bs->io_limits_enabled = true; |
|
} |
|
|
|
bool bdrv_io_limits_enabled(BlockDriverState *bs) |
|
{ |
|
BlockIOLimit *io_limits = &bs->io_limits; |
|
return io_limits->bps[BLOCK_IO_LIMIT_READ] |
|
|| io_limits->bps[BLOCK_IO_LIMIT_WRITE] |
|
|| io_limits->bps[BLOCK_IO_LIMIT_TOTAL] |
|
|| io_limits->iops[BLOCK_IO_LIMIT_READ] |
|
|| io_limits->iops[BLOCK_IO_LIMIT_WRITE] |
|
|| io_limits->iops[BLOCK_IO_LIMIT_TOTAL]; |
|
} |
|
|
|
static void bdrv_io_limits_intercept(BlockDriverState *bs, |
|
bool is_write, int nb_sectors) |
|
{ |
|
int64_t wait_time = -1; |
|
|
|
if (!qemu_co_queue_empty(&bs->throttled_reqs)) { |
|
qemu_co_queue_wait(&bs->throttled_reqs); |
|
} |
|
|
|
/* In fact, we hope to keep each request's timing, in FIFO mode. The next |
|
* throttled requests will not be dequeued until the current request is |
|
* allowed to be serviced. So if the current request still exceeds the |
|
* limits, it will be inserted to the head. All requests followed it will |
|
* be still in throttled_reqs queue. |
|
*/ |
|
|
|
while (bdrv_exceed_io_limits(bs, nb_sectors, is_write, &wait_time)) { |
|
qemu_mod_timer(bs->block_timer, |
|
wait_time + qemu_get_clock_ns(vm_clock)); |
|
qemu_co_queue_wait_insert_head(&bs->throttled_reqs); |
|
} |
|
|
|
qemu_co_queue_next(&bs->throttled_reqs); |
|
} |
|
|
|
/* check if the path starts with "<protocol>:" */ |
|
static int path_has_protocol(const char *path) |
{ |
{ |
const char *p; |
const char *p; |
|
|
#ifdef _WIN32 |
#ifdef _WIN32 |
/* specific case for names like: "\\.\d:" */ |
if (is_windows_drive(path) || |
if (*path == '/' || *path == '\\') |
is_windows_drive_prefix(path)) { |
return 1; |
return 0; |
|
} |
|
p = path + strcspn(path, ":/\\"); |
|
#else |
|
p = path + strcspn(path, ":/"); |
#endif |
#endif |
p = strchr(path, ':'); |
|
if (p) |
return *p == ':'; |
p++; |
} |
else |
|
p = path; |
int path_is_absolute(const char *path) |
|
{ |
#ifdef _WIN32 |
#ifdef _WIN32 |
return (*p == '/' || *p == '\\'); |
/* specific case for names like: "\\.\d:" */ |
|
if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
|
return 1; |
|
} |
|
return (*path == '/' || *path == '\\'); |
#else |
#else |
return (*p == '/'); |
return (*path == '/'); |
#endif |
#endif |
} |
} |
|
|
Line 127 void path_combine(char *dest, int dest_s
|
Line 270 void path_combine(char *dest, int dest_s
|
} |
} |
} |
} |
|
|
|
void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
|
{ |
|
if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { |
|
pstrcpy(dest, sz, bs->backing_file); |
|
} else { |
|
path_combine(dest, sz, bs->filename, bs->backing_file); |
|
} |
|
} |
|
|
static void bdrv_register(BlockDriver *bdrv) |
void bdrv_register(BlockDriver *bdrv) |
{ |
{ |
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; |
|
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 */ |
|
bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
|
bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
|
} |
} |
} |
bdrv->next = first_drv; |
|
first_drv = bdrv; |
QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
} |
} |
|
|
/* 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; |
|
|
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; |
|
while (*pbs != NULL) |
|
pbs = &(*pbs)->next; |
|
*pbs = bs; |
|
} |
} |
|
bdrv_iostatus_disable(bs); |
return bs; |
return bs; |
} |
} |
|
|
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; |
|
} |
} |
} |
return NULL; |
return NULL; |
} |
} |
|
|
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[] = { |
|
CONFIG_BDRV_WHITELIST |
|
}; |
|
const char **p; |
|
|
|
if (!whitelist[0]) |
|
return 1; /* no whitelist, anything goes */ |
|
|
|
for (p = whitelist; *p; p++) { |
|
if (!strcmp(drv->format_name, *p)) { |
|
return 1; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
BlockDriver *bdrv_find_whitelisted_format(const char *format_name) |
|
{ |
|
BlockDriver *drv = bdrv_find_format(format_name); |
|
return drv && bdrv_is_whitelisted(drv) ? drv : NULL; |
|
} |
|
|
|
typedef struct CreateCo { |
|
BlockDriver *drv; |
|
char *filename; |
|
QEMUOptionParameter *options; |
|
int ret; |
|
} CreateCo; |
|
|
|
static void coroutine_fn bdrv_create_co_entry(void *opaque) |
|
{ |
|
CreateCo *cco = opaque; |
|
assert(cco->drv); |
|
|
|
cco->ret = cco->drv->bdrv_create(cco->filename, cco->options); |
|
} |
|
|
|
int bdrv_create(BlockDriver *drv, const char* filename, |
|
QEMUOptionParameter *options) |
{ |
{ |
if (!drv->bdrv_create) |
int ret; |
|
|
|
Coroutine *co; |
|
CreateCo cco = { |
|
.drv = drv, |
|
.filename = g_strdup(filename), |
|
.options = options, |
|
.ret = NOT_DONE, |
|
}; |
|
|
|
if (!drv->bdrv_create) { |
return -ENOTSUP; |
return -ENOTSUP; |
return drv->bdrv_create(filename, size_in_sectors, backing_file, flags); |
} |
|
|
|
if (qemu_in_coroutine()) { |
|
/* Fast-path if already in coroutine context */ |
|
bdrv_create_co_entry(&cco); |
|
} else { |
|
co = qemu_coroutine_create(bdrv_create_co_entry); |
|
qemu_coroutine_enter(co, &cco); |
|
while (cco.ret == NOT_DONE) { |
|
qemu_aio_wait(); |
|
} |
|
} |
|
|
|
ret = cco.ret; |
|
g_free(cco.filename); |
|
|
|
return ret; |
} |
} |
|
|
#ifdef _WIN32 |
int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
void get_tmp_filename(char *filename, int size) |
|
{ |
{ |
char temp_dir[MAX_PATH]; |
BlockDriver *drv; |
|
|
|
drv = bdrv_find_protocol(filename); |
|
if (drv == NULL) { |
|
return -ENOENT; |
|
} |
|
|
GetTempPath(MAX_PATH, temp_dir); |
return bdrv_create(drv, filename, options); |
GetTempFileName(temp_dir, "qem", 0, filename); |
|
} |
} |
#else |
|
void get_tmp_filename(char *filename, int size) |
/* |
|
* Create a uniquely-named empty temporary file. |
|
* Return 0 upon success, otherwise a negative errno value. |
|
*/ |
|
int get_tmp_filename(char *filename, int size) |
{ |
{ |
|
#ifdef _WIN32 |
|
char temp_dir[MAX_PATH]; |
|
/* GetTempFileName requires that its output buffer (4th param) |
|
have length MAX_PATH or greater. */ |
|
assert(size >= MAX_PATH); |
|
return (GetTempPath(MAX_PATH, temp_dir) |
|
&& GetTempFileName(temp_dir, "qem", 0, filename) |
|
? 0 : -GetLastError()); |
|
#else |
int fd; |
int fd; |
const char *tmpdir; |
const char *tmpdir; |
/* XXX: race condition possible */ |
|
tmpdir = getenv("TMPDIR"); |
tmpdir = getenv("TMPDIR"); |
if (!tmpdir) |
if (!tmpdir) |
tmpdir = "/tmp"; |
tmpdir = "/tmp"; |
snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); |
if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
|
return -EOVERFLOW; |
|
} |
fd = mkstemp(filename); |
fd = mkstemp(filename); |
close(fd); |
if (fd < 0 || close(fd)) { |
} |
return -errno; |
|
} |
|
return 0; |
#endif |
#endif |
|
|
#ifdef _WIN32 |
|
static int is_windows_drive_prefix(const char *filename) |
|
{ |
|
return (((filename[0] >= 'a' && filename[0] <= 'z') || |
|
(filename[0] >= 'A' && filename[0] <= 'Z')) && |
|
filename[1] == ':'); |
|
} |
} |
|
|
static int is_windows_drive(const char *filename) |
/* |
|
* Detect host devices. By convention, /dev/cdrom[N] is always |
|
* recognized as a host CDROM. |
|
*/ |
|
static BlockDriver *find_hdev_driver(const char *filename) |
{ |
{ |
if (is_windows_drive_prefix(filename) && |
int score_max = 0, score; |
filename[2] == '\0') |
BlockDriver *drv = NULL, *d; |
return 1; |
|
if (strstart(filename, "\\\\.\\", NULL) || |
QLIST_FOREACH(d, &bdrv_drivers, list) { |
strstart(filename, "//./", NULL)) |
if (d->bdrv_probe_device) { |
return 1; |
score = d->bdrv_probe_device(filename); |
return 0; |
if (score > score_max) { |
|
score_max = score; |
|
drv = d; |
|
} |
|
} |
|
} |
|
|
|
return drv; |
} |
} |
#endif |
|
|
|
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; |
|
|
#ifdef _WIN32 |
/* TODO Drivers without bdrv_file_open must be specified explicitly */ |
if (is_windows_drive(filename) || |
|
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 |
|
* later breaks access to device names with colons in them. |
|
* Thanks to the brain-dead persistent naming schemes on udev- |
|
* based Linux systems those actually are quite common. |
|
*/ |
|
drv1 = find_hdev_driver(filename); |
|
if (drv1) { |
|
return drv1; |
|
} |
|
|
|
if (!path_has_protocol(filename)) { |
|
return bdrv_find_format("file"); |
|
} |
p = strchr(filename, ':'); |
p = strchr(filename, ':'); |
if (!p) |
assert(p != NULL); |
return &bdrv_raw; |
|
len = p - filename; |
len = p - filename; |
if (len > sizeof(protocol) - 1) |
if (len > sizeof(protocol) - 1) |
len = sizeof(protocol) - 1; |
len = sizeof(protocol) - 1; |
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; |
|
} |
} |
} |
return NULL; |
return NULL; |
} |
} |
|
|
/* 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 */ |
|
static BlockDriver *find_image_format(const char *filename) |
|
{ |
{ |
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; |
|
|
/* 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 |
|
if (is_windows_drive(filename)) |
|
return &bdrv_host_device; |
|
#else |
|
{ |
|
struct stat st; |
|
if (stat(filename, &st) >= 0 && |
|
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
|
return &bdrv_host_device; |
|
} |
|
} |
} |
#endif |
|
|
|
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"); |
|
if (!drv) { |
|
ret = -ENOENT; |
|
} |
|
*pdrv = drv; |
|
return ret; |
|
} |
|
|
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
|
if (ret < 0) |
|
return NULL; |
|
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; |
|
return ret; |
} |
} |
|
|
score_max = 0; |
score_max = 0; |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
drv = NULL; |
|
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
|
Line 544 static BlockDriver *find_image_format(co
|
} |
} |
} |
} |
} |
} |
return drv; |
if (!drv) { |
|
ret = -ENOENT; |
|
} |
|
*pdrv = drv; |
|
return ret; |
} |
} |
|
|
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
/** |
|
* Set the current 'total_sectors' value |
|
*/ |
|
static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
{ |
{ |
BlockDriverState *bs; |
BlockDriver *drv = bs->drv; |
int ret; |
|
|
|
bs = bdrv_new(""); |
/* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); |
if (bs->sg) |
if (ret < 0) { |
return 0; |
bdrv_delete(bs); |
|
return ret; |
/* query actual device if possible, otherwise just trust the hint */ |
|
if (drv->bdrv_getlength) { |
|
int64_t length = drv->bdrv_getlength(bs); |
|
if (length < 0) { |
|
return length; |
|
} |
|
hint = length >> BDRV_SECTOR_BITS; |
} |
} |
bs->growable = 1; |
|
*pbs = bs; |
bs->total_sectors = hint; |
|
return 0; |
|
} |
|
|
|
/** |
|
* Set open flags for a given cache mode |
|
* |
|
* Return 0 on success, -1 if the cache mode was invalid. |
|
*/ |
|
int bdrv_parse_cache_flags(const char *mode, int *flags) |
|
{ |
|
*flags &= ~BDRV_O_CACHE_MASK; |
|
|
|
if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
|
*flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; |
|
} else if (!strcmp(mode, "directsync")) { |
|
*flags |= BDRV_O_NOCACHE; |
|
} else if (!strcmp(mode, "writeback")) { |
|
*flags |= BDRV_O_CACHE_WB; |
|
} else if (!strcmp(mode, "unsafe")) { |
|
*flags |= BDRV_O_CACHE_WB; |
|
*flags |= BDRV_O_NO_FLUSH; |
|
} else if (!strcmp(mode, "writethrough")) { |
|
/* this is the default */ |
|
} else { |
|
return -1; |
|
} |
|
|
return 0; |
return 0; |
} |
} |
|
|
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
/** |
|
* The copy-on-read flag is actually a reference count so multiple users may |
|
* use the feature without worrying about clobbering its previous state. |
|
* Copy-on-read stays enabled until all users have called to disable it. |
|
*/ |
|
void bdrv_enable_copy_on_read(BlockDriverState *bs) |
|
{ |
|
bs->copy_on_read++; |
|
} |
|
|
|
void bdrv_disable_copy_on_read(BlockDriverState *bs) |
{ |
{ |
return bdrv_open2(bs, filename, flags, NULL); |
assert(bs->copy_on_read > 0); |
|
bs->copy_on_read--; |
} |
} |
|
|
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
/* |
BlockDriver *drv) |
* Common part for opening disk images and files |
|
*/ |
|
static int bdrv_open_common(BlockDriverState *bs, const char *filename, |
|
int flags, BlockDriver *drv) |
{ |
{ |
int ret, open_flags; |
int ret, open_flags; |
char tmp_filename[PATH_MAX]; |
|
char backing_filename[PATH_MAX]; |
|
|
|
bs->read_only = 0; |
assert(drv != NULL); |
bs->is_temporary = 0; |
assert(bs->file == NULL); |
bs->encrypted = 0; |
|
bs->valid_key = 0; |
|
|
|
if (flags & BDRV_O_SNAPSHOT) { |
trace_bdrv_open_common(bs, filename, flags, drv->format_name); |
BlockDriverState *bs1; |
|
int64_t total_size; |
|
int is_protocol = 0; |
|
|
|
/* if snapshot, we create a temporary backing file and open it |
bs->open_flags = flags; |
instead of opening 'filename' directly */ |
bs->buffer_alignment = 512; |
|
|
/* if there is a backing file, use it */ |
assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
bs1 = bdrv_new(""); |
if ((flags & BDRV_O_RDWR) && (flags & BDRV_O_COPY_ON_READ)) { |
ret = bdrv_open(bs1, filename, 0); |
bdrv_enable_copy_on_read(bs); |
if (ret < 0) { |
} |
bdrv_delete(bs1); |
|
return ret; |
|
} |
|
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
|
|
|
if (bs1->drv && bs1->drv->protocol_name) |
pstrcpy(bs->filename, sizeof(bs->filename), filename); |
is_protocol = 1; |
|
|
|
bdrv_delete(bs1); |
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { |
|
return -ENOTSUP; |
|
} |
|
|
get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
bs->drv = drv; |
|
bs->opaque = g_malloc0(drv->instance_size); |
|
|
/* Real path is meaningless for protocols */ |
bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
if (is_protocol) |
|
snprintf(backing_filename, sizeof(backing_filename), |
|
"%s", filename); |
|
else |
|
realpath(filename, backing_filename); |
|
|
|
ret = bdrv_create(&bdrv_qcow2, tmp_filename, |
/* |
total_size, backing_filename, 0); |
* Clear flags that are internal to the block layer before opening the |
if (ret < 0) { |
* image. |
return ret; |
*/ |
|
open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
|
|
|
/* |
|
* Snapshots should be writable. |
|
*/ |
|
if (bs->is_temporary) { |
|
open_flags |= BDRV_O_RDWR; |
|
} |
|
|
|
bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
|
|
|
/* Open the image, either directly or using a protocol */ |
|
if (drv->bdrv_file_open) { |
|
ret = drv->bdrv_file_open(bs, filename, open_flags); |
|
} else { |
|
ret = bdrv_file_open(&bs->file, filename, open_flags); |
|
if (ret >= 0) { |
|
ret = drv->bdrv_open(bs, open_flags); |
} |
} |
filename = tmp_filename; |
|
bs->is_temporary = 1; |
|
} |
} |
|
|
pstrcpy(bs->filename, sizeof(bs->filename), filename); |
if (ret < 0) { |
if (flags & BDRV_O_FILE) { |
goto free_and_fail; |
drv = find_protocol(filename); |
|
} else if (!drv) { |
|
drv = find_image_format(filename); |
|
} |
} |
if (!drv) { |
|
ret = -ENOENT; |
ret = refresh_total_sectors(bs, bs->total_sectors); |
goto unlink_and_fail; |
if (ret < 0) { |
} |
goto free_and_fail; |
bs->drv = drv; |
|
bs->opaque = qemu_mallocz(drv->instance_size); |
|
/* Note: for compatibility, we open disk image files as RDWR, and |
|
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) { |
|
qemu_free(bs->opaque); |
|
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 |
#ifndef _WIN32 |
if (bs->is_temporary) { |
if (bs->is_temporary) { |
unlink(filename); |
unlink(filename); |
} |
} |
#endif |
#endif |
if (bs->backing_file[0] != '\0') { |
return 0; |
|
|
|
free_and_fail: |
|
if (bs->file) { |
|
bdrv_delete(bs->file); |
|
bs->file = NULL; |
|
} |
|
g_free(bs->opaque); |
|
bs->opaque = NULL; |
|
bs->drv = NULL; |
|
return ret; |
|
} |
|
|
|
/* |
|
* Opens a file using a protocol (file, host_device, nbd, ...) |
|
*/ |
|
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
|
{ |
|
BlockDriverState *bs; |
|
BlockDriver *drv; |
|
int ret; |
|
|
|
drv = bdrv_find_protocol(filename); |
|
if (!drv) { |
|
return -ENOENT; |
|
} |
|
|
|
bs = bdrv_new(""); |
|
ret = bdrv_open_common(bs, filename, flags, drv); |
|
if (ret < 0) { |
|
bdrv_delete(bs); |
|
return ret; |
|
} |
|
bs->growable = 1; |
|
*pbs = bs; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Opens a disk image (raw, qcow2, vmdk, ...) |
|
*/ |
|
int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
|
BlockDriver *drv) |
|
{ |
|
int ret; |
|
char tmp_filename[PATH_MAX]; |
|
|
|
if (flags & BDRV_O_SNAPSHOT) { |
|
BlockDriverState *bs1; |
|
int64_t total_size; |
|
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 |
|
instead of opening 'filename' directly */ |
|
|
/* if there is a backing file, use it */ |
/* if there is a backing file, use it */ |
|
bs1 = bdrv_new(""); |
|
ret = bdrv_open(bs1, filename, 0, drv); |
|
if (ret < 0) { |
|
bdrv_delete(bs1); |
|
return ret; |
|
} |
|
total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
|
|
|
if (bs1->drv && bs1->drv->protocol_name) |
|
is_protocol = 1; |
|
|
|
bdrv_delete(bs1); |
|
|
|
ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
|
if (ret < 0) { |
|
return ret; |
|
} |
|
|
|
/* Real path is meaningless for protocols */ |
|
if (is_protocol) |
|
snprintf(backing_filename, sizeof(backing_filename), |
|
"%s", filename); |
|
else if (!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, options); |
|
free_option_parameters(options); |
|
if (ret < 0) { |
|
return ret; |
|
} |
|
|
|
filename = tmp_filename; |
|
drv = bdrv_qcow2; |
|
bs->is_temporary = 1; |
|
} |
|
|
|
/* Find the right image format driver */ |
|
if (!drv) { |
|
ret = find_image_format(filename, &drv); |
|
} |
|
|
|
if (!drv) { |
|
goto unlink_and_fail; |
|
} |
|
|
|
/* Open the image */ |
|
ret = bdrv_open_common(bs, filename, flags, drv); |
|
if (ret < 0) { |
|
goto unlink_and_fail; |
|
} |
|
|
|
/* 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), |
bdrv_get_full_backing_filename(bs, backing_filename, |
filename, bs->backing_file); |
sizeof(backing_filename)); |
ret = bdrv_open(bs->backing_hd, backing_filename, open_flags); |
|
|
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); |
|
|
/* throttling disk I/O limits */ |
|
if (bs->io_limits_enabled) { |
|
bdrv_io_limits_enable(bs); |
|
} |
|
|
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) |
{ |
{ |
|
bdrv_flush(bs); |
if (bs->drv) { |
if (bs->drv) { |
if (bs->backing_hd) |
if (bs->job) { |
|
block_job_cancel_sync(bs->job); |
|
} |
|
bdrv_drain_all(); |
|
|
|
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 452 void bdrv_close(BlockDriverState *bs)
|
Line 883 void bdrv_close(BlockDriverState *bs)
|
#endif |
#endif |
bs->opaque = NULL; |
bs->opaque = NULL; |
bs->drv = NULL; |
bs->drv = NULL; |
|
bs->copy_on_read = 0; |
|
bs->backing_file[0] = '\0'; |
|
bs->backing_format[0] = '\0'; |
|
bs->total_sectors = 0; |
|
bs->encrypted = 0; |
|
bs->valid_key = 0; |
|
bs->sg = 0; |
|
bs->growable = 0; |
|
|
|
if (bs->file != NULL) { |
|
bdrv_delete(bs->file); |
|
bs->file = NULL; |
|
} |
|
|
|
bdrv_dev_change_media_cb(bs, false); |
|
} |
|
|
/* call the change callback */ |
/*throttling disk I/O limits*/ |
bs->media_changed = 1; |
if (bs->io_limits_enabled) { |
if (bs->change_cb) |
bdrv_io_limits_disable(bs); |
bs->change_cb(bs->change_opaque); |
|
} |
} |
} |
} |
|
|
void bdrv_delete(BlockDriverState *bs) |
void bdrv_close_all(void) |
{ |
{ |
BlockDriverState **pbs; |
BlockDriverState *bs; |
|
|
pbs = &bdrv_first; |
|
while (*pbs != bs && *pbs != NULL) |
|
pbs = &(*pbs)->next; |
|
if (*pbs == bs) |
|
*pbs = bs->next; |
|
|
|
bdrv_close(bs); |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
qemu_free(bs); |
bdrv_close(bs); |
|
} |
} |
} |
|
|
/* commit COW file into the raw image */ |
/* |
int bdrv_commit(BlockDriverState *bs) |
* Wait for pending requests to complete across all BlockDriverStates |
|
* |
|
* This function does not flush data to disk, use bdrv_flush_all() for that |
|
* after calling this function. |
|
* |
|
* Note that completion of an asynchronous I/O operation can trigger any |
|
* number of other I/O operations on other devices---for example a coroutine |
|
* can be arbitrarily complex and a constant flow of I/O can come until the |
|
* coroutine is complete. Because of this, it is not possible to have a |
|
* function to drain a single device's I/O queue. |
|
*/ |
|
void bdrv_drain_all(void) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriverState *bs; |
int64_t i, total_sectors; |
bool busy; |
int n, j; |
|
unsigned char sector[512]; |
|
|
|
if (!drv) |
do { |
return -ENOMEDIUM; |
busy = qemu_aio_wait(); |
|
|
if (bs->read_only) { |
/* FIXME: We do not have timer support here, so this is effectively |
return -EACCES; |
* a busy wait. |
} |
*/ |
|
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
|
if (!qemu_co_queue_empty(&bs->throttled_reqs)) { |
|
qemu_co_queue_restart_all(&bs->throttled_reqs); |
|
busy = true; |
|
} |
|
} |
|
} while (busy); |
|
|
if (!bs->backing_hd) { |
/* If requests are still pending there is a bug somewhere */ |
return -ENOTSUP; |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
|
assert(QLIST_EMPTY(&bs->tracked_requests)); |
|
assert(qemu_co_queue_empty(&bs->throttled_reqs)); |
} |
} |
|
} |
|
|
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
/* make a BlockDriverState anonymous by removing from bdrv_state list. |
for (i = 0; i < total_sectors;) { |
Also, NULL terminate the device_name to prevent double remove */ |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
void bdrv_make_anon(BlockDriverState *bs) |
for(j = 0; j < n; j++) { |
{ |
if (bdrv_read(bs, i, sector, 1) != 0) { |
if (bs->device_name[0] != '\0') { |
return -EIO; |
QTAILQ_REMOVE(&bdrv_states, bs, list); |
} |
} |
|
bs->device_name[0] = '\0'; |
|
} |
|
|
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
static void bdrv_rebind(BlockDriverState *bs) |
return -EIO; |
{ |
} |
if (bs->drv && bs->drv->bdrv_rebind) { |
i++; |
bs->drv->bdrv_rebind(bs); |
} |
|
} else { |
|
i += n; |
|
} |
|
} |
} |
|
} |
|
|
if (drv->bdrv_make_empty) |
/* |
return drv->bdrv_make_empty(bs); |
* Add new bs contents at the top of an image chain while the chain is |
|
* live, while keeping required fields on the top layer. |
|
* |
|
* This will modify the BlockDriverState fields, and swap contents |
|
* between bs_new and bs_top. Both bs_new and bs_top are modified. |
|
* |
|
* bs_new is required to be anonymous. |
|
* |
|
* This function does not create any image files. |
|
*/ |
|
void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) |
|
{ |
|
BlockDriverState tmp; |
|
|
return 0; |
/* bs_new must be anonymous */ |
|
assert(bs_new->device_name[0] == '\0'); |
|
|
|
tmp = *bs_new; |
|
|
|
/* there are some fields that need to stay on the top layer: */ |
|
tmp.open_flags = bs_top->open_flags; |
|
|
|
/* dev info */ |
|
tmp.dev_ops = bs_top->dev_ops; |
|
tmp.dev_opaque = bs_top->dev_opaque; |
|
tmp.dev = bs_top->dev; |
|
tmp.buffer_alignment = bs_top->buffer_alignment; |
|
tmp.copy_on_read = bs_top->copy_on_read; |
|
|
|
/* i/o timing parameters */ |
|
tmp.slice_time = bs_top->slice_time; |
|
tmp.slice_start = bs_top->slice_start; |
|
tmp.slice_end = bs_top->slice_end; |
|
tmp.io_limits = bs_top->io_limits; |
|
tmp.io_base = bs_top->io_base; |
|
tmp.throttled_reqs = bs_top->throttled_reqs; |
|
tmp.block_timer = bs_top->block_timer; |
|
tmp.io_limits_enabled = bs_top->io_limits_enabled; |
|
|
|
/* geometry */ |
|
tmp.cyls = bs_top->cyls; |
|
tmp.heads = bs_top->heads; |
|
tmp.secs = bs_top->secs; |
|
tmp.translation = bs_top->translation; |
|
|
|
/* r/w error */ |
|
tmp.on_read_error = bs_top->on_read_error; |
|
tmp.on_write_error = bs_top->on_write_error; |
|
|
|
/* i/o status */ |
|
tmp.iostatus_enabled = bs_top->iostatus_enabled; |
|
tmp.iostatus = bs_top->iostatus; |
|
|
|
/* keep the same entry in bdrv_states */ |
|
pstrcpy(tmp.device_name, sizeof(tmp.device_name), bs_top->device_name); |
|
tmp.list = bs_top->list; |
|
|
|
/* The contents of 'tmp' will become bs_top, as we are |
|
* swapping bs_new and bs_top contents. */ |
|
tmp.backing_hd = bs_new; |
|
pstrcpy(tmp.backing_file, sizeof(tmp.backing_file), bs_top->filename); |
|
bdrv_get_format(bs_top, tmp.backing_format, sizeof(tmp.backing_format)); |
|
|
|
/* swap contents of the fixed new bs and the current top */ |
|
*bs_new = *bs_top; |
|
*bs_top = tmp; |
|
|
|
/* device_name[] was carried over from the old bs_top. bs_new |
|
* shouldn't be in bdrv_states, so we need to make device_name[] |
|
* reflect the anonymity of bs_new |
|
*/ |
|
bs_new->device_name[0] = '\0'; |
|
|
|
/* clear the copied fields in the new backing file */ |
|
bdrv_detach_dev(bs_new, bs_new->dev); |
|
|
|
qemu_co_queue_init(&bs_new->throttled_reqs); |
|
memset(&bs_new->io_base, 0, sizeof(bs_new->io_base)); |
|
memset(&bs_new->io_limits, 0, sizeof(bs_new->io_limits)); |
|
bdrv_iostatus_disable(bs_new); |
|
|
|
/* we don't use bdrv_io_limits_disable() for this, because we don't want |
|
* to affect or delete the block_timer, as it has been moved to bs_top */ |
|
bs_new->io_limits_enabled = false; |
|
bs_new->block_timer = NULL; |
|
bs_new->slice_time = 0; |
|
bs_new->slice_start = 0; |
|
bs_new->slice_end = 0; |
|
|
|
bdrv_rebind(bs_new); |
|
bdrv_rebind(bs_top); |
} |
} |
|
|
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
void bdrv_delete(BlockDriverState *bs) |
size_t size) |
|
{ |
{ |
int64_t len; |
assert(!bs->dev); |
|
assert(!bs->job); |
if (!bdrv_is_inserted(bs)) |
assert(!bs->in_use); |
return -ENOMEDIUM; |
|
|
|
if (bs->growable) |
/* remove from list, if necessary */ |
return 0; |
bdrv_make_anon(bs); |
|
|
len = bdrv_getlength(bs); |
bdrv_close(bs); |
|
|
if ((offset + size) > len) |
assert(bs != bs_snapshots); |
return -EIO; |
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; |
return 0; |
} |
} |
|
|
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
/* TODO qdevified devices don't use this, remove when devices are qdevified */ |
int nb_sectors) |
void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) |
{ |
{ |
int64_t offset; |
if (bdrv_attach_dev(bs, dev) < 0) { |
|
abort(); |
|
} |
|
} |
|
|
/* Deal with byte accesses */ |
void bdrv_detach_dev(BlockDriverState *bs, void *dev) |
if (sector_num < 0) |
/* TODO change to DeviceState *dev when all users are qdevified */ |
offset = -sector_num; |
{ |
else |
assert(bs->dev == dev); |
offset = sector_num * 512; |
bs->dev = NULL; |
|
bs->dev_ops = NULL; |
|
bs->dev_opaque = NULL; |
|
bs->buffer_alignment = 512; |
|
} |
|
|
return bdrv_check_byte_request(bs, offset, nb_sectors * 512); |
/* TODO change to return DeviceState * when all users are qdevified */ |
|
void *bdrv_get_attached_dev(BlockDriverState *bs) |
|
{ |
|
return bs->dev; |
} |
} |
|
|
/* return < 0 if error. See bdrv_write() for the return codes */ |
void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
void *opaque) |
uint8_t *buf, int nb_sectors) |
|
{ |
{ |
BlockDriver *drv = bs->drv; |
bs->dev_ops = ops; |
|
bs->dev_opaque = opaque; |
|
if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) { |
|
bs_snapshots = NULL; |
|
} |
|
} |
|
|
if (!drv) |
void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
return -ENOMEDIUM; |
BlockQMPEventAction action, int is_read) |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
{ |
return -EIO; |
QObject *data; |
|
const char *action_str; |
|
|
if (drv->bdrv_pread) { |
switch (action) { |
int ret, len; |
case BDRV_ACTION_REPORT: |
len = nb_sectors * 512; |
action_str = "report"; |
ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); |
break; |
if (ret < 0) |
case BDRV_ACTION_IGNORE: |
return ret; |
action_str = "ignore"; |
else if (ret != len) |
break; |
return -EINVAL; |
case BDRV_ACTION_STOP: |
else { |
action_str = "stop"; |
bs->rd_bytes += (unsigned) len; |
break; |
bs->rd_ops ++; |
default: |
return 0; |
abort(); |
} |
|
} else { |
|
return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
|
} |
} |
|
|
|
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); |
} |
} |
|
|
/* Return < 0 if error. Important errors are: |
static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
-EIO generic I/O error (may happen for all errors) |
|
-ENOMEDIUM No media inserted. |
|
-EINVAL Invalid sector number or nb_sectors |
|
-EACCES Trying to write a read-only device |
|
*/ |
|
int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
|
const uint8_t *buf, int nb_sectors) |
|
{ |
{ |
BlockDriver *drv = bs->drv; |
QObject *data; |
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) { |
data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", |
int ret, len, count = 0; |
bdrv_get_device_name(bs), ejected); |
len = nb_sectors * 512; |
monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); |
do { |
|
ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len - count); |
qobject_decref(data); |
if (ret < 0) { |
} |
printf("bdrv_write ret=%d\n", ret); |
|
return ret; |
static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
} |
{ |
count += ret; |
if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
buf += ret; |
bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
} while (count != len); |
bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
bs->wr_bytes += (unsigned) len; |
if (tray_was_closed) { |
bs->wr_ops ++; |
/* tray open */ |
return 0; |
bdrv_emit_qmp_eject_event(bs, true); |
|
} |
|
if (load) { |
|
/* tray close */ |
|
bdrv_emit_qmp_eject_event(bs, false); |
|
} |
} |
} |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
|
} |
} |
|
|
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
uint8_t *buf, int count1) |
|
{ |
{ |
uint8_t tmp_buf[SECTOR_SIZE]; |
return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); |
int len, nb_sectors, count; |
} |
int64_t sector_num; |
|
|
|
count = count1; |
void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
/* first read to align to sector start */ |
{ |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); |
if (bs->dev_ops && bs->dev_ops->eject_request_cb) { |
if (len > count) |
bs->dev_ops->eject_request_cb(bs->dev_opaque, force); |
len = count; |
|
sector_num = offset >> SECTOR_BITS; |
|
if (len > 0) { |
|
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
|
return -EIO; |
|
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); |
|
count -= len; |
|
if (count == 0) |
|
return count1; |
|
sector_num++; |
|
buf += len; |
|
} |
} |
|
} |
|
|
/* read the sectors "in place" */ |
bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
nb_sectors = count >> SECTOR_BITS; |
{ |
if (nb_sectors > 0) { |
if (bs->dev_ops && bs->dev_ops->is_tray_open) { |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
return bs->dev_ops->is_tray_open(bs->dev_opaque); |
return -EIO; |
|
sector_num += nb_sectors; |
|
len = nb_sectors << SECTOR_BITS; |
|
buf += len; |
|
count -= len; |
|
} |
} |
|
return false; |
|
} |
|
|
/* add data from the last sector */ |
static void bdrv_dev_resize_cb(BlockDriverState *bs) |
if (count > 0) { |
{ |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
if (bs->dev_ops && bs->dev_ops->resize_cb) { |
return -EIO; |
bs->dev_ops->resize_cb(bs->dev_opaque); |
memcpy(buf, tmp_buf, count); |
|
} |
} |
return count1; |
|
} |
} |
|
|
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
const uint8_t *buf, int count1) |
|
{ |
{ |
uint8_t tmp_buf[SECTOR_SIZE]; |
if (bs->dev_ops && bs->dev_ops->is_medium_locked) { |
int len, nb_sectors, count; |
return bs->dev_ops->is_medium_locked(bs->dev_opaque); |
int64_t sector_num; |
} |
|
return false; |
|
} |
|
|
count = count1; |
/* |
/* first write to align to sector start */ |
* Run consistency checks on an image |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); |
* |
if (len > count) |
* Returns 0 if the check could be completed (it doesn't mean that the image is |
len = count; |
* free of errors) or -errno when an internal error occurred. The results of the |
sector_num = offset >> SECTOR_BITS; |
* 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) { |
|
return -ENOTSUP; |
|
} |
|
|
|
if (bs->backing_hd->keep_read_only) { |
|
return -EACCES; |
|
} |
|
|
|
if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
|
return -EBUSY; |
|
} |
|
|
|
backing_drv = bs->backing_hd->drv; |
|
ro = bs->backing_hd->read_only; |
|
strncpy(filename, bs->backing_hd->filename, sizeof(filename)); |
|
open_flags = bs->backing_hd->open_flags; |
|
|
|
if (ro) { |
|
/* 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; |
|
} |
|
|
|
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
|
buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
|
|
|
for (sector = 0; sector < total_sectors; sector += n) { |
|
if (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; |
|
} |
|
|
|
int bdrv_commit_all(void) |
|
{ |
|
BlockDriverState *bs; |
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
|
int ret = bdrv_commit(bs); |
|
if (ret < 0) { |
|
return ret; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
struct BdrvTrackedRequest { |
|
BlockDriverState *bs; |
|
int64_t sector_num; |
|
int nb_sectors; |
|
bool is_write; |
|
QLIST_ENTRY(BdrvTrackedRequest) list; |
|
Coroutine *co; /* owner, used for deadlock detection */ |
|
CoQueue wait_queue; /* coroutines blocked on this request */ |
|
}; |
|
|
|
/** |
|
* Remove an active request from the tracked requests list |
|
* |
|
* This function should be called when a tracked request is completing. |
|
*/ |
|
static void tracked_request_end(BdrvTrackedRequest *req) |
|
{ |
|
QLIST_REMOVE(req, list); |
|
qemu_co_queue_restart_all(&req->wait_queue); |
|
} |
|
|
|
/** |
|
* Add an active request to the tracked requests list |
|
*/ |
|
static void tracked_request_begin(BdrvTrackedRequest *req, |
|
BlockDriverState *bs, |
|
int64_t sector_num, |
|
int nb_sectors, bool is_write) |
|
{ |
|
*req = (BdrvTrackedRequest){ |
|
.bs = bs, |
|
.sector_num = sector_num, |
|
.nb_sectors = nb_sectors, |
|
.is_write = is_write, |
|
.co = qemu_coroutine_self(), |
|
}; |
|
|
|
qemu_co_queue_init(&req->wait_queue); |
|
|
|
QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
|
} |
|
|
|
/** |
|
* Round a region to cluster boundaries |
|
*/ |
|
static void round_to_clusters(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, |
|
int64_t *cluster_sector_num, |
|
int *cluster_nb_sectors) |
|
{ |
|
BlockDriverInfo bdi; |
|
|
|
if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { |
|
*cluster_sector_num = sector_num; |
|
*cluster_nb_sectors = nb_sectors; |
|
} else { |
|
int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; |
|
*cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); |
|
*cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + |
|
nb_sectors, c); |
|
} |
|
} |
|
|
|
static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
|
int64_t sector_num, int nb_sectors) { |
|
/* aaaa bbbb */ |
|
if (sector_num >= req->sector_num + req->nb_sectors) { |
|
return false; |
|
} |
|
/* bbbb aaaa */ |
|
if (req->sector_num >= sector_num + nb_sectors) { |
|
return false; |
|
} |
|
return true; |
|
} |
|
|
|
static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors) |
|
{ |
|
BdrvTrackedRequest *req; |
|
int64_t cluster_sector_num; |
|
int cluster_nb_sectors; |
|
bool retry; |
|
|
|
/* If we touch the same cluster it counts as an overlap. This guarantees |
|
* that allocating writes will be serialized and not race with each other |
|
* for the same cluster. For example, in copy-on-read it ensures that the |
|
* CoR read and write operations are atomic and guest writes cannot |
|
* interleave between them. |
|
*/ |
|
round_to_clusters(bs, sector_num, nb_sectors, |
|
&cluster_sector_num, &cluster_nb_sectors); |
|
|
|
do { |
|
retry = false; |
|
QLIST_FOREACH(req, &bs->tracked_requests, list) { |
|
if (tracked_request_overlaps(req, cluster_sector_num, |
|
cluster_nb_sectors)) { |
|
/* Hitting this means there was a reentrant request, for |
|
* example, a block driver issuing nested requests. This must |
|
* never happen since it means deadlock. |
|
*/ |
|
assert(qemu_coroutine_self() != req->co); |
|
|
|
qemu_co_queue_wait(&req->wait_queue); |
|
retry = true; |
|
break; |
|
} |
|
} |
|
} while (retry); |
|
} |
|
|
|
/* |
|
* 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; |
|
int ret; |
|
|
|
/* Backing file format doesn't make sense without a backing file */ |
|
if (backing_fmt && !backing_file) { |
|
return -EINVAL; |
|
} |
|
|
|
if (drv->bdrv_change_backing_file != NULL) { |
|
ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
|
} else { |
|
ret = -ENOTSUP; |
|
} |
|
|
|
if (ret == 0) { |
|
pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
|
pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
|
} |
|
return ret; |
|
} |
|
|
|
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
|
size_t size) |
|
{ |
|
int64_t len; |
|
|
|
if (!bdrv_is_inserted(bs)) |
|
return -ENOMEDIUM; |
|
|
|
if (bs->growable) |
|
return 0; |
|
|
|
len = bdrv_getlength(bs); |
|
|
|
if (offset < 0) |
|
return -EIO; |
|
|
|
if ((offset > len) || (len - offset < size)) |
|
return -EIO; |
|
|
|
return 0; |
|
} |
|
|
|
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
|
int nb_sectors) |
|
{ |
|
return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
|
nb_sectors * BDRV_SECTOR_SIZE); |
|
} |
|
|
|
typedef struct RwCo { |
|
BlockDriverState *bs; |
|
int64_t sector_num; |
|
int nb_sectors; |
|
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, 0); |
|
} else { |
|
rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, |
|
rwco->nb_sectors, rwco->qiov, 0); |
|
} |
|
} |
|
|
|
/* |
|
* 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); |
|
|
|
/** |
|
* In sync call context, when the vcpu is blocked, this throttling timer |
|
* will not fire; so the I/O throttling function has to be disabled here |
|
* if it has been enabled. |
|
*/ |
|
if (bs->io_limits_enabled) { |
|
fprintf(stderr, "Disabling I/O throttling on '%s' due " |
|
"to synchronous I/O.\n", bdrv_get_device_name(bs)); |
|
bdrv_io_limits_disable(bs); |
|
} |
|
|
|
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 */ |
|
int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
|
uint8_t *buf, int nb_sectors) |
|
{ |
|
return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); |
|
} |
|
|
|
#define BITS_PER_LONG (sizeof(unsigned long) * 8) |
|
|
|
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
|
int nb_sectors, int dirty) |
|
{ |
|
int64_t start, end; |
|
unsigned long val, idx, bit; |
|
|
|
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
|
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
|
|
|
for (; start <= end; start++) { |
|
idx = start / BITS_PER_LONG; |
|
bit = start % BITS_PER_LONG; |
|
val = bs->dirty_bitmap[idx]; |
|
if (dirty) { |
|
if (!(val & (1UL << bit))) { |
|
bs->dirty_count++; |
|
val |= 1UL << bit; |
|
} |
|
} else { |
|
if (val & (1UL << bit)) { |
|
bs->dirty_count--; |
|
val &= ~(1UL << bit); |
|
} |
|
} |
|
bs->dirty_bitmap[idx] = val; |
|
} |
|
} |
|
|
|
/* Return < 0 if error. Important errors are: |
|
-EIO generic I/O error (may happen for all errors) |
|
-ENOMEDIUM No media inserted. |
|
-EINVAL Invalid sector number or nb_sectors |
|
-EACCES Trying to write a read-only device |
|
*/ |
|
int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
|
const uint8_t *buf, int nb_sectors) |
|
{ |
|
return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); |
|
} |
|
|
|
int bdrv_pread(BlockDriverState *bs, int64_t offset, |
|
void *buf, int count1) |
|
{ |
|
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
|
int len, nb_sectors, count; |
|
int64_t sector_num; |
|
int ret; |
|
|
|
count = count1; |
|
/* first read to align to sector start */ |
|
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
|
if (len > count) |
|
len = count; |
|
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(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
count -= len; |
return -EIO; |
if (count == 0) |
|
return count1; |
|
sector_num++; |
|
buf += len; |
|
} |
|
|
|
/* read the sectors "in place" */ |
|
nb_sectors = count >> BDRV_SECTOR_BITS; |
|
if (nb_sectors > 0) { |
|
if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
|
return ret; |
|
sector_num += nb_sectors; |
|
len = nb_sectors << BDRV_SECTOR_BITS; |
|
buf += len; |
|
count -= len; |
|
} |
|
|
|
/* add data from the last sector */ |
|
if (count > 0) { |
|
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
|
return ret; |
|
memcpy(buf, tmp_buf, count); |
|
} |
|
return count1; |
|
} |
|
|
|
int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
|
const void *buf, int count1) |
|
{ |
|
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
|
int len, nb_sectors, count; |
|
int64_t sector_num; |
|
int ret; |
|
|
|
count = count1; |
|
/* first write to align to sector start */ |
|
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
|
if (len > count) |
|
len = count; |
|
sector_num = offset >> BDRV_SECTOR_BITS; |
|
if (len > 0) { |
|
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
|
return ret; |
|
memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
|
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
|
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 1721 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; |
|
} |
|
|
|
static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
{ |
{ |
|
/* Perform I/O through a temporary buffer so that users who scribble over |
|
* their read buffer while the operation is in progress do not end up |
|
* modifying the image file. This is critical for zero-copy guest I/O |
|
* where anything might happen inside guest memory. |
|
*/ |
|
void *bounce_buffer; |
|
|
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
|
struct iovec iov; |
|
QEMUIOVector bounce_qiov; |
|
int64_t cluster_sector_num; |
|
int cluster_nb_sectors; |
|
size_t skip_bytes; |
|
int ret; |
|
|
if (!drv) |
/* Cover entire cluster so no additional backing file I/O is required when |
return -ENOMEDIUM; |
* allocating cluster in the image file. |
if (bdrv_check_byte_request(bs, offset, count1)) |
*/ |
return -EIO; |
round_to_clusters(bs, sector_num, nb_sectors, |
|
&cluster_sector_num, &cluster_nb_sectors); |
|
|
|
trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
|
cluster_sector_num, cluster_nb_sectors); |
|
|
|
iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; |
|
iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); |
|
qemu_iovec_init_external(&bounce_qiov, &iov, 1); |
|
|
|
ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
|
&bounce_qiov); |
|
if (ret < 0) { |
|
goto err; |
|
} |
|
|
|
if (drv->bdrv_co_write_zeroes && |
|
buffer_is_zero(bounce_buffer, iov.iov_len)) { |
|
ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
|
cluster_nb_sectors); |
|
} else { |
|
ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
|
&bounce_qiov); |
|
} |
|
|
|
if (ret < 0) { |
|
/* It might be okay to ignore write errors for guest requests. If this |
|
* is a deliberate copy-on-read then we don't want to ignore the error. |
|
* Simply report it in all cases. |
|
*/ |
|
goto err; |
|
} |
|
|
|
skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; |
|
qemu_iovec_from_buffer(qiov, bounce_buffer + skip_bytes, |
|
nb_sectors * BDRV_SECTOR_SIZE); |
|
|
|
err: |
|
qemu_vfree(bounce_buffer); |
|
return ret; |
|
} |
|
|
|
/* |
|
* 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, |
|
BdrvRequestFlags flags) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
BdrvTrackedRequest req; |
|
int ret; |
|
|
|
if (!drv) { |
|
return -ENOMEDIUM; |
|
} |
|
if (bdrv_check_request(bs, sector_num, nb_sectors)) { |
|
return -EIO; |
|
} |
|
|
|
/* throttling disk read I/O */ |
|
if (bs->io_limits_enabled) { |
|
bdrv_io_limits_intercept(bs, false, nb_sectors); |
|
} |
|
|
|
if (bs->copy_on_read) { |
|
flags |= BDRV_REQ_COPY_ON_READ; |
|
} |
|
if (flags & BDRV_REQ_COPY_ON_READ) { |
|
bs->copy_on_read_in_flight++; |
|
} |
|
|
|
if (bs->copy_on_read_in_flight) { |
|
wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
|
} |
|
|
|
tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
|
|
|
if (flags & BDRV_REQ_COPY_ON_READ) { |
|
int pnum; |
|
|
|
ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum); |
|
if (ret < 0) { |
|
goto out; |
|
} |
|
|
|
if (!ret || pnum != nb_sectors) { |
|
ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
|
goto out; |
|
} |
|
} |
|
|
|
ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
|
|
|
out: |
|
tracked_request_end(&req); |
|
|
|
if (flags & BDRV_REQ_COPY_ON_READ) { |
|
bs->copy_on_read_in_flight--; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
|
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, 0); |
|
} |
|
|
|
int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
|
{ |
|
trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); |
|
|
|
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, |
|
BDRV_REQ_COPY_ON_READ); |
|
} |
|
|
|
static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
QEMUIOVector qiov; |
|
struct iovec iov; |
|
int ret; |
|
|
|
/* TODO Emulate only part of misaligned requests instead of letting block |
|
* drivers return -ENOTSUP and emulate everything */ |
|
|
|
/* First try the efficient write zeroes operation */ |
|
if (drv->bdrv_co_write_zeroes) { |
|
ret = drv->bdrv_co_write_zeroes(bs, sector_num, nb_sectors); |
|
if (ret != -ENOTSUP) { |
|
return ret; |
|
} |
|
} |
|
|
|
/* Fall back to bounce buffer if write zeroes is unsupported */ |
|
iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
|
iov.iov_base = qemu_blockalign(bs, iov.iov_len); |
|
memset(iov.iov_base, 0, iov.iov_len); |
|
qemu_iovec_init_external(&qiov, &iov, 1); |
|
|
|
ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); |
|
|
|
qemu_vfree(iov.iov_base); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Handle a write request in coroutine context |
|
*/ |
|
static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
|
BdrvRequestFlags flags) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
BdrvTrackedRequest req; |
|
int ret; |
|
|
|
if (!bs->drv) { |
|
return -ENOMEDIUM; |
|
} |
|
if (bs->read_only) { |
|
return -EACCES; |
|
} |
|
if (bdrv_check_request(bs, sector_num, nb_sectors)) { |
|
return -EIO; |
|
} |
|
|
|
/* throttling disk write I/O */ |
|
if (bs->io_limits_enabled) { |
|
bdrv_io_limits_intercept(bs, true, nb_sectors); |
|
} |
|
|
|
if (bs->copy_on_read_in_flight) { |
|
wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
|
} |
|
|
|
tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
|
|
|
if (flags & BDRV_REQ_ZERO_WRITE) { |
|
ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors); |
|
} else { |
|
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; |
|
} |
|
|
|
tracked_request_end(&req); |
|
|
|
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); |
|
|
|
return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
|
} |
|
|
|
int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors) |
|
{ |
|
trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors); |
|
|
|
return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, |
|
BDRV_REQ_ZERO_WRITE); |
|
} |
|
|
|
/** |
|
* Truncate file to 'offset' bytes (needed only for file protocols) |
|
*/ |
|
int bdrv_truncate(BlockDriverState *bs, int64_t offset) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
int ret; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (!drv->bdrv_truncate) |
|
return -ENOTSUP; |
|
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; |
|
} |
|
|
|
/** |
|
* Length of a file in bytes. Return < 0 if error or unknown. |
|
*/ |
|
int64_t bdrv_getlength(BlockDriverState *bs) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
|
|
if (bs->growable || bdrv_dev_has_removable_media(bs)) { |
|
if (drv->bdrv_getlength) { |
|
return drv->bdrv_getlength(bs); |
|
} |
|
} |
|
return bs->total_sectors * BDRV_SECTOR_SIZE; |
|
} |
|
|
|
/* return 0 as number of sectors if no device present or error */ |
|
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
|
{ |
|
int64_t length; |
|
length = bdrv_getlength(bs); |
|
if (length < 0) |
|
length = 0; |
|
else |
|
length = length >> BDRV_SECTOR_BITS; |
|
*nb_sectors_ptr = length; |
|
} |
|
|
|
struct partition { |
|
uint8_t boot_ind; /* 0x80 - active */ |
|
uint8_t head; /* starting head */ |
|
uint8_t sector; /* starting sector */ |
|
uint8_t cyl; /* starting cylinder */ |
|
uint8_t sys_ind; /* What partition type */ |
|
uint8_t end_head; /* end head */ |
|
uint8_t end_sector; /* end sector */ |
|
uint8_t end_cyl; /* end cylinder */ |
|
uint32_t start_sect; /* starting sector counting from 0 */ |
|
uint32_t nr_sects; /* nr of sectors in partition */ |
|
} QEMU_PACKED; |
|
|
|
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ |
|
static int guess_disk_lchs(BlockDriverState *bs, |
|
int *pcylinders, int *pheads, int *psectors) |
|
{ |
|
uint8_t buf[BDRV_SECTOR_SIZE]; |
|
int ret, i, heads, sectors, cylinders; |
|
struct partition *p; |
|
uint32_t nr_sects; |
|
uint64_t nb_sectors; |
|
bool enabled; |
|
|
|
bdrv_get_geometry(bs, &nb_sectors); |
|
|
|
/** |
|
* The function will be invoked during startup not only in sync I/O mode, |
|
* but also in async I/O mode. So the I/O throttling function has to |
|
* be disabled temporarily here, not permanently. |
|
*/ |
|
enabled = bs->io_limits_enabled; |
|
bs->io_limits_enabled = false; |
|
ret = bdrv_read(bs, 0, buf, 1); |
|
bs->io_limits_enabled = enabled; |
|
if (ret < 0) |
|
return -1; |
|
/* test msdos magic */ |
|
if (buf[510] != 0x55 || buf[511] != 0xaa) |
|
return -1; |
|
for(i = 0; i < 4; i++) { |
|
p = ((struct partition *)(buf + 0x1be)) + i; |
|
nr_sects = le32_to_cpu(p->nr_sects); |
|
if (nr_sects && p->end_head) { |
|
/* We make the assumption that the partition terminates on |
|
a cylinder boundary */ |
|
heads = p->end_head + 1; |
|
sectors = p->end_sector & 63; |
|
if (sectors == 0) |
|
continue; |
|
cylinders = nb_sectors / (heads * sectors); |
|
if (cylinders < 1 || cylinders > 16383) |
|
continue; |
|
*pheads = heads; |
|
*psectors = sectors; |
|
*pcylinders = cylinders; |
|
#if 0 |
|
printf("guessed geometry: LCHS=%d %d %d\n", |
|
cylinders, heads, sectors); |
|
#endif |
|
return 0; |
|
} |
|
} |
|
return -1; |
|
} |
|
|
|
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
|
{ |
|
int translation, lba_detected = 0; |
|
int cylinders, heads, secs; |
|
uint64_t nb_sectors; |
|
|
|
/* if a geometry hint is available, use it */ |
|
bdrv_get_geometry(bs, &nb_sectors); |
|
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
|
translation = bdrv_get_translation_hint(bs); |
|
if (cylinders != 0) { |
|
*pcyls = cylinders; |
|
*pheads = heads; |
|
*psecs = secs; |
|
} else { |
|
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
|
if (heads > 16) { |
|
/* if heads > 16, it means that a BIOS LBA |
|
translation was active, so the default |
|
hardware geometry is OK */ |
|
lba_detected = 1; |
|
goto default_geometry; |
|
} else { |
|
*pcyls = cylinders; |
|
*pheads = heads; |
|
*psecs = secs; |
|
/* disable any translation to be in sync with |
|
the logical geometry */ |
|
if (translation == BIOS_ATA_TRANSLATION_AUTO) { |
|
bdrv_set_translation_hint(bs, |
|
BIOS_ATA_TRANSLATION_NONE); |
|
} |
|
} |
|
} else { |
|
default_geometry: |
|
/* if no geometry, use a standard physical disk geometry */ |
|
cylinders = nb_sectors / (16 * 63); |
|
|
|
if (cylinders > 16383) |
|
cylinders = 16383; |
|
else if (cylinders < 2) |
|
cylinders = 2; |
|
*pcyls = cylinders; |
|
*pheads = 16; |
|
*psecs = 63; |
|
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
|
if ((*pcyls * *pheads) <= 131072) { |
|
bdrv_set_translation_hint(bs, |
|
BIOS_ATA_TRANSLATION_LARGE); |
|
} else { |
|
bdrv_set_translation_hint(bs, |
|
BIOS_ATA_TRANSLATION_LBA); |
|
} |
|
} |
|
} |
|
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
|
} |
|
} |
|
|
|
void bdrv_set_geometry_hint(BlockDriverState *bs, |
|
int cyls, int heads, int secs) |
|
{ |
|
bs->cyls = cyls; |
|
bs->heads = heads; |
|
bs->secs = secs; |
|
} |
|
|
|
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
|
{ |
|
bs->translation = translation; |
|
} |
|
|
|
void bdrv_get_geometry_hint(BlockDriverState *bs, |
|
int *pcyls, int *pheads, int *psecs) |
|
{ |
|
*pcyls = bs->cyls; |
|
*pheads = bs->heads; |
|
*psecs = bs->secs; |
|
} |
|
|
|
/* throttling disk io limits */ |
|
void bdrv_set_io_limits(BlockDriverState *bs, |
|
BlockIOLimit *io_limits) |
|
{ |
|
bs->io_limits = *io_limits; |
|
bs->io_limits_enabled = bdrv_io_limits_enabled(bs); |
|
} |
|
|
|
/* Recognize floppy formats */ |
|
typedef struct FDFormat { |
|
FDriveType drive; |
|
uint8_t last_sect; |
|
uint8_t max_track; |
|
uint8_t max_head; |
|
FDriveRate rate; |
|
} 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_RATE_500K, }, |
|
{ FDRIVE_DRV_144, 20, 80, 1, FDRIVE_RATE_500K, }, |
|
{ FDRIVE_DRV_144, 21, 80, 1, FDRIVE_RATE_500K, }, |
|
{ FDRIVE_DRV_144, 21, 82, 1, FDRIVE_RATE_500K, }, |
|
{ FDRIVE_DRV_144, 21, 83, 1, FDRIVE_RATE_500K, }, |
|
{ FDRIVE_DRV_144, 22, 80, 1, FDRIVE_RATE_500K, }, |
|
{ FDRIVE_DRV_144, 23, 80, 1, FDRIVE_RATE_500K, }, |
|
{ FDRIVE_DRV_144, 24, 80, 1, FDRIVE_RATE_500K, }, |
|
/* 2.88 MB 3"1/2 floppy disks */ |
|
{ FDRIVE_DRV_288, 36, 80, 1, FDRIVE_RATE_1M, }, |
|
{ FDRIVE_DRV_288, 39, 80, 1, FDRIVE_RATE_1M, }, |
|
{ FDRIVE_DRV_288, 40, 80, 1, FDRIVE_RATE_1M, }, |
|
{ FDRIVE_DRV_288, 44, 80, 1, FDRIVE_RATE_1M, }, |
|
{ FDRIVE_DRV_288, 48, 80, 1, FDRIVE_RATE_1M, }, |
|
/* 720 kB 3"1/2 floppy disks */ |
|
{ FDRIVE_DRV_144, 9, 80, 1, FDRIVE_RATE_250K, }, |
|
{ FDRIVE_DRV_144, 10, 80, 1, FDRIVE_RATE_250K, }, |
|
{ FDRIVE_DRV_144, 10, 82, 1, FDRIVE_RATE_250K, }, |
|
{ FDRIVE_DRV_144, 10, 83, 1, FDRIVE_RATE_250K, }, |
|
{ FDRIVE_DRV_144, 13, 80, 1, FDRIVE_RATE_250K, }, |
|
{ FDRIVE_DRV_144, 14, 80, 1, FDRIVE_RATE_250K, }, |
|
/* 1.2 MB 5"1/4 floppy disks */ |
|
{ FDRIVE_DRV_120, 15, 80, 1, FDRIVE_RATE_500K, }, |
|
{ FDRIVE_DRV_120, 18, 80, 1, FDRIVE_RATE_500K, }, |
|
{ FDRIVE_DRV_120, 18, 82, 1, FDRIVE_RATE_500K, }, |
|
{ FDRIVE_DRV_120, 18, 83, 1, FDRIVE_RATE_500K, }, |
|
{ FDRIVE_DRV_120, 20, 80, 1, FDRIVE_RATE_500K, }, |
|
/* 720 kB 5"1/4 floppy disks */ |
|
{ FDRIVE_DRV_120, 9, 80, 1, FDRIVE_RATE_250K, }, |
|
{ FDRIVE_DRV_120, 11, 80, 1, FDRIVE_RATE_250K, }, |
|
/* 360 kB 5"1/4 floppy disks */ |
|
{ FDRIVE_DRV_120, 9, 40, 1, FDRIVE_RATE_300K, }, |
|
{ FDRIVE_DRV_120, 9, 40, 0, FDRIVE_RATE_300K, }, |
|
{ FDRIVE_DRV_120, 10, 41, 1, FDRIVE_RATE_300K, }, |
|
{ FDRIVE_DRV_120, 10, 42, 1, FDRIVE_RATE_300K, }, |
|
/* 320 kB 5"1/4 floppy disks */ |
|
{ FDRIVE_DRV_120, 8, 40, 1, FDRIVE_RATE_250K, }, |
|
{ FDRIVE_DRV_120, 8, 40, 0, FDRIVE_RATE_250K, }, |
|
/* 360 kB must match 5"1/4 better than 3"1/2... */ |
|
{ FDRIVE_DRV_144, 9, 80, 0, FDRIVE_RATE_250K, }, |
|
/* end */ |
|
{ FDRIVE_DRV_NONE, -1, -1, 0, 0, }, |
|
}; |
|
|
|
void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, |
|
int *max_track, int *last_sect, |
|
FDriveType drive_in, FDriveType *drive, |
|
FDriveRate *rate) |
|
{ |
|
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 */ |
|
*rate = FDRIVE_RATE_500K; |
|
} 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; |
|
*rate = parse->rate; |
|
} |
|
} |
|
|
|
int bdrv_get_translation_hint(BlockDriverState *bs) |
|
{ |
|
return bs->translation; |
|
} |
|
|
|
void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, |
|
BlockErrorAction on_write_error) |
|
{ |
|
bs->on_read_error = on_read_error; |
|
bs->on_write_error = on_write_error; |
|
} |
|
|
|
BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) |
|
{ |
|
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) |
|
{ |
|
return bs->sg; |
|
} |
|
|
|
int bdrv_enable_write_cache(BlockDriverState *bs) |
|
{ |
|
return bs->enable_write_cache; |
|
} |
|
|
|
int bdrv_is_encrypted(BlockDriverState *bs) |
|
{ |
|
if (bs->backing_hd && bs->backing_hd->encrypted) |
|
return 1; |
|
return bs->encrypted; |
|
} |
|
|
|
int bdrv_key_required(BlockDriverState *bs) |
|
{ |
|
BlockDriverState *backing_hd = bs->backing_hd; |
|
|
|
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) |
|
return 1; |
|
return (bs->encrypted && !bs->valid_key); |
|
} |
|
|
|
int bdrv_set_key(BlockDriverState *bs, const char *key) |
|
{ |
|
int ret; |
|
if (bs->backing_hd && bs->backing_hd->encrypted) { |
|
ret = bdrv_set_key(bs->backing_hd, key); |
|
if (ret < 0) |
|
return ret; |
|
if (!bs->encrypted) |
|
return 0; |
|
} |
|
if (!bs->encrypted) { |
|
return -EINVAL; |
|
} else if (!bs->drv || !bs->drv->bdrv_set_key) { |
|
return -ENOMEDIUM; |
|
} |
|
ret = bs->drv->bdrv_set_key(bs, key); |
|
if (ret < 0) { |
|
bs->valid_key = 0; |
|
} else if (!bs->valid_key) { |
|
bs->valid_key = 1; |
|
/* call the change callback now, we skipped it on open */ |
|
bdrv_dev_change_media_cb(bs, true); |
|
} |
|
return ret; |
|
} |
|
|
|
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
|
{ |
|
if (!bs->drv) { |
|
buf[0] = '\0'; |
|
} else { |
|
pstrcpy(buf, buf_size, bs->drv->format_name); |
|
} |
|
} |
|
|
|
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
|
void *opaque) |
|
{ |
|
BlockDriver *drv; |
|
|
|
QLIST_FOREACH(drv, &bdrv_drivers, list) { |
|
it(opaque, drv->format_name); |
|
} |
|
} |
|
|
|
BlockDriverState *bdrv_find(const char *name) |
|
{ |
|
BlockDriverState *bs; |
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
|
if (!strcmp(name, bs->device_name)) { |
|
return bs; |
|
} |
|
} |
|
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) |
|
{ |
|
BlockDriverState *bs; |
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
|
it(opaque, bs); |
|
} |
|
} |
|
|
|
const char *bdrv_get_device_name(BlockDriverState *bs) |
|
{ |
|
return bs->device_name; |
|
} |
|
|
|
void bdrv_flush_all(void) |
|
{ |
|
BlockDriverState *bs; |
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
|
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; |
|
} |
|
|
|
typedef struct BdrvCoIsAllocatedData { |
|
BlockDriverState *bs; |
|
int64_t sector_num; |
|
int nb_sectors; |
|
int *pnum; |
|
int ret; |
|
bool done; |
|
} BdrvCoIsAllocatedData; |
|
|
|
/* |
|
* Returns true iff the specified sector is present in the disk image. Drivers |
|
* not implementing the functionality are assumed to not support backing files, |
|
* hence all their sectors are reported as allocated. |
|
* |
|
* If 'sector_num' is beyond the end of the disk image the return value is 0 |
|
* and 'pnum' is set to 0. |
|
* |
|
* 'pnum' is set to the number of sectors (including and immediately following |
|
* the specified sector) that are known to be in the same |
|
* allocated/unallocated state. |
|
* |
|
* 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
|
* beyond the end of the disk image it will be clamped. |
|
*/ |
|
int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num, |
|
int nb_sectors, int *pnum) |
|
{ |
|
int64_t n; |
|
|
|
if (sector_num >= bs->total_sectors) { |
|
*pnum = 0; |
|
return 0; |
|
} |
|
|
|
n = bs->total_sectors - sector_num; |
|
if (n < nb_sectors) { |
|
nb_sectors = n; |
|
} |
|
|
|
if (!bs->drv->bdrv_co_is_allocated) { |
|
*pnum = nb_sectors; |
|
return 1; |
|
} |
|
|
|
return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum); |
|
} |
|
|
|
/* Coroutine wrapper for bdrv_is_allocated() */ |
|
static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque) |
|
{ |
|
BdrvCoIsAllocatedData *data = opaque; |
|
BlockDriverState *bs = data->bs; |
|
|
|
data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors, |
|
data->pnum); |
|
data->done = true; |
|
} |
|
|
|
/* |
|
* Synchronous wrapper around bdrv_co_is_allocated(). |
|
* |
|
* See bdrv_co_is_allocated() for details. |
|
*/ |
|
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
|
int *pnum) |
|
{ |
|
Coroutine *co; |
|
BdrvCoIsAllocatedData data = { |
|
.bs = bs, |
|
.sector_num = sector_num, |
|
.nb_sectors = nb_sectors, |
|
.pnum = pnum, |
|
.done = false, |
|
}; |
|
|
|
co = qemu_coroutine_create(bdrv_is_allocated_co_entry); |
|
qemu_coroutine_enter(co, &data); |
|
while (!data.done) { |
|
qemu_aio_wait(); |
|
} |
|
return data.ret; |
|
} |
|
|
|
BlockInfoList *qmp_query_block(Error **errp) |
|
{ |
|
BlockInfoList *head = NULL, *cur_item = NULL; |
|
BlockDriverState *bs; |
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
|
BlockInfoList *info = g_malloc0(sizeof(*info)); |
|
|
|
info->value = g_malloc0(sizeof(*info->value)); |
|
info->value->device = g_strdup(bs->device_name); |
|
info->value->type = g_strdup("unknown"); |
|
info->value->locked = bdrv_dev_is_medium_locked(bs); |
|
info->value->removable = bdrv_dev_has_removable_media(bs); |
|
|
|
if (bdrv_dev_has_removable_media(bs)) { |
|
info->value->has_tray_open = true; |
|
info->value->tray_open = bdrv_dev_is_tray_open(bs); |
|
} |
|
|
|
if (bdrv_iostatus_is_enabled(bs)) { |
|
info->value->has_io_status = true; |
|
info->value->io_status = bs->iostatus; |
|
} |
|
|
|
if (bs->drv) { |
|
info->value->has_inserted = true; |
|
info->value->inserted = g_malloc0(sizeof(*info->value->inserted)); |
|
info->value->inserted->file = g_strdup(bs->filename); |
|
info->value->inserted->ro = bs->read_only; |
|
info->value->inserted->drv = g_strdup(bs->drv->format_name); |
|
info->value->inserted->encrypted = bs->encrypted; |
|
if (bs->backing_file[0]) { |
|
info->value->inserted->has_backing_file = true; |
|
info->value->inserted->backing_file = g_strdup(bs->backing_file); |
|
} |
|
|
|
if (bs->io_limits_enabled) { |
|
info->value->inserted->bps = |
|
bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; |
|
info->value->inserted->bps_rd = |
|
bs->io_limits.bps[BLOCK_IO_LIMIT_READ]; |
|
info->value->inserted->bps_wr = |
|
bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE]; |
|
info->value->inserted->iops = |
|
bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; |
|
info->value->inserted->iops_rd = |
|
bs->io_limits.iops[BLOCK_IO_LIMIT_READ]; |
|
info->value->inserted->iops_wr = |
|
bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE]; |
|
} |
|
} |
|
|
|
/* XXX: waiting for the qapi to support GSList */ |
|
if (!cur_item) { |
|
head = cur_item = info; |
|
} else { |
|
cur_item->next = info; |
|
cur_item = info; |
|
} |
|
} |
|
|
|
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; |
|
} |
|
|
|
BlockStatsList *qmp_query_blockstats(Error **errp) |
|
{ |
|
BlockStatsList *head = NULL, *cur_item = NULL; |
|
BlockDriverState *bs; |
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
|
BlockStatsList *info = g_malloc0(sizeof(*info)); |
|
info->value = qmp_query_blockstat(bs, NULL); |
|
|
|
/* XXX: waiting for the qapi to support GSList */ |
|
if (!cur_item) { |
|
head = cur_item = info; |
|
} else { |
|
cur_item->next = info; |
|
cur_item = info; |
|
} |
|
} |
|
|
|
return head; |
|
} |
|
|
|
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
|
{ |
|
if (bs->backing_hd && bs->backing_hd->encrypted) |
|
return bs->backing_file; |
|
else if (bs->encrypted) |
|
return bs->filename; |
|
else |
|
return NULL; |
|
} |
|
|
|
void bdrv_get_backing_filename(BlockDriverState *bs, |
|
char *filename, int filename_size) |
|
{ |
|
pstrcpy(filename, filename_size, bs->backing_file); |
|
} |
|
|
|
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
|
const uint8_t *buf, int nb_sectors) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (!drv->bdrv_write_compressed) |
|
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); |
|
} |
|
|
|
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (!drv->bdrv_get_info) |
|
return -ENOTSUP; |
|
memset(bdi, 0, sizeof(*bdi)); |
|
return drv->bdrv_get_info(bs, bdi); |
|
} |
|
|
|
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
|
int64_t pos, int size) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (drv->bdrv_save_vmstate) |
|
return drv->bdrv_save_vmstate(bs, buf, pos, size); |
|
if (bs->file) |
|
return bdrv_save_vmstate(bs->file, buf, pos, size); |
|
return -ENOTSUP; |
|
} |
|
|
|
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
|
int64_t pos, int size) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (drv->bdrv_load_vmstate) |
|
return drv->bdrv_load_vmstate(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 */ |
|
|
|
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, |
|
QEMUSnapshotInfo *sn_info) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (drv->bdrv_snapshot_create) |
|
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, |
|
const char *snapshot_id) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
int ret, open_ret; |
|
|
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (drv->bdrv_snapshot_goto) |
|
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) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (drv->bdrv_snapshot_delete) |
|
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, |
|
QEMUSnapshotInfo **psn_info) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (drv->bdrv_snapshot_list) |
|
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; |
|
} |
|
|
|
BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
|
const char *backing_file) |
|
{ |
|
if (!bs->drv) { |
|
return NULL; |
|
} |
|
|
|
if (bs->backing_hd) { |
|
if (strcmp(bs->backing_file, backing_file) == 0) { |
|
return bs->backing_hd; |
|
} else { |
|
return bdrv_find_backing_image(bs->backing_hd, backing_file); |
|
} |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
#define NB_SUFFIXES 4 |
|
|
|
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
|
{ |
|
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
|
int64_t base; |
|
int i; |
|
|
|
if (size <= 999) { |
|
snprintf(buf, buf_size, "%" PRId64, size); |
|
} else { |
|
base = 1024; |
|
for(i = 0; i < NB_SUFFIXES; i++) { |
|
if (size < (10 * base)) { |
|
snprintf(buf, buf_size, "%0.1f%c", |
|
(double)size / base, |
|
suffixes[i]); |
|
break; |
|
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
|
snprintf(buf, buf_size, "%" PRId64 "%c", |
|
((size + (base >> 1)) / base), |
|
suffixes[i]); |
|
break; |
|
} |
|
base = base * 1024; |
|
} |
|
} |
|
return buf; |
|
} |
|
|
|
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
|
{ |
|
char buf1[128], date_buf[128], clock_buf[128]; |
|
#ifdef _WIN32 |
|
struct tm *ptm; |
|
#else |
|
struct tm tm; |
|
#endif |
|
time_t ti; |
|
int64_t secs; |
|
|
|
if (!sn) { |
|
snprintf(buf, buf_size, |
|
"%-10s%-20s%7s%20s%15s", |
|
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
|
} else { |
|
ti = sn->date_sec; |
|
#ifdef _WIN32 |
|
ptm = localtime(&ti); |
|
strftime(date_buf, sizeof(date_buf), |
|
"%Y-%m-%d %H:%M:%S", ptm); |
|
#else |
|
localtime_r(&ti, &tm); |
|
strftime(date_buf, sizeof(date_buf), |
|
"%Y-%m-%d %H:%M:%S", &tm); |
|
#endif |
|
secs = sn->vm_clock_nsec / 1000000000; |
|
snprintf(clock_buf, sizeof(clock_buf), |
|
"%02d:%02d:%02d.%03d", |
|
(int)(secs / 3600), |
|
(int)((secs / 60) % 60), |
|
(int)(secs % 60), |
|
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
|
snprintf(buf, buf_size, |
|
"%-10s%-20s%7s%20s%15s", |
|
sn->id_str, sn->name, |
|
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), |
|
date_buf, |
|
clock_buf); |
|
} |
|
return buf; |
|
} |
|
|
|
/**************************************************************/ |
|
/* async I/Os */ |
|
|
|
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
|
QEMUIOVector *qiov, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
|
{ |
|
trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
|
|
|
return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
|
cb, opaque, false); |
|
} |
|
|
|
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
|
QEMUIOVector *qiov, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
|
{ |
|
trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
|
|
|
return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
|
cb, opaque, true); |
|
} |
|
|
|
|
|
typedef struct MultiwriteCB { |
|
int error; |
|
int num_requests; |
|
int num_callbacks; |
|
struct { |
|
BlockDriverCompletionFunc *cb; |
|
void *opaque; |
|
QEMUIOVector *free_qiov; |
|
} callbacks[]; |
|
} MultiwriteCB; |
|
|
|
static void multiwrite_user_cb(MultiwriteCB *mcb) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < mcb->num_callbacks; i++) { |
|
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
|
if (mcb->callbacks[i].free_qiov) { |
|
qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
|
} |
|
g_free(mcb->callbacks[i].free_qiov); |
|
} |
|
} |
|
|
|
static void multiwrite_cb(void *opaque, int ret) |
|
{ |
|
MultiwriteCB *mcb = opaque; |
|
|
|
trace_multiwrite_cb(mcb, ret); |
|
|
|
if (ret < 0 && !mcb->error) { |
|
mcb->error = ret; |
|
} |
|
|
|
mcb->num_requests--; |
|
if (mcb->num_requests == 0) { |
|
multiwrite_user_cb(mcb); |
|
g_free(mcb); |
|
} |
|
} |
|
|
|
static int multiwrite_req_compare(const void *a, const void *b) |
|
{ |
|
const BlockRequest *req1 = a, *req2 = b; |
|
|
|
/* |
|
* Note that we can't simply subtract req2->sector from req1->sector |
|
* here as that could overflow the return value. |
|
*/ |
|
if (req1->sector > req2->sector) { |
|
return 1; |
|
} else if (req1->sector < req2->sector) { |
|
return -1; |
|
} else { |
|
return 0; |
|
} |
|
} |
|
|
|
/* |
|
* Takes a bunch of requests and tries to merge them. Returns the number of |
|
* requests that remain after merging. |
|
*/ |
|
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
|
int num_reqs, MultiwriteCB *mcb) |
|
{ |
|
int i, outidx; |
|
|
|
// Sort requests by start sector |
|
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); |
|
|
|
// Check if adjacent requests touch the same clusters. If so, combine them, |
|
// filling up gaps with zero sectors. |
|
outidx = 0; |
|
for (i = 1; i < num_reqs; i++) { |
|
int merge = 0; |
|
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
|
|
|
// Handle exactly sequential writes and overlapping writes. |
|
if (reqs[i].sector <= oldreq_last) { |
|
merge = 1; |
|
} |
|
|
|
if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
|
merge = 0; |
|
} |
|
|
if (!drv->bdrv_pread) |
if (merge) { |
return bdrv_pread_em(bs, offset, buf1, count1); |
size_t size; |
return drv->bdrv_pread(bs, offset, buf1, count1); |
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 should need to add any zeros between the two requests |
|
assert (reqs[i].sector <= oldreq_last); |
|
|
/** |
// Add the second request |
* Write with byte offsets (needed only for file protocols) |
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
*/ |
|
int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
|
const void *buf1, int count1) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
|
|
if (!drv) |
reqs[outidx].nb_sectors = qiov->size >> 9; |
return -ENOMEDIUM; |
reqs[outidx].qiov = qiov; |
if (bdrv_check_byte_request(bs, offset, count1)) |
|
return -EIO; |
|
|
|
if (!drv->bdrv_pwrite) |
mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
return bdrv_pwrite_em(bs, offset, buf1, count1); |
} else { |
return drv->bdrv_pwrite(bs, offset, buf1, count1); |
outidx++; |
} |
reqs[outidx].sector = reqs[i].sector; |
|
reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
|
reqs[outidx].qiov = reqs[i].qiov; |
|
} |
|
} |
|
|
/** |
return outidx + 1; |
* Truncate file to 'offset' bytes (needed only for file protocols) |
|
*/ |
|
int bdrv_truncate(BlockDriverState *bs, int64_t offset) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
if (!drv) |
|
return -ENOMEDIUM; |
|
if (!drv->bdrv_truncate) |
|
return -ENOTSUP; |
|
return drv->bdrv_truncate(bs, offset); |
|
} |
} |
|
|
/** |
/* |
* Length of a file in bytes. Return < 0 if error or unknown. |
* Submit multiple AIO write requests at once. |
|
* |
|
* On success, the function returns 0 and all requests in the reqs array have |
|
* been submitted. In error case this function returns -1, and any of the |
|
* requests may or may not be submitted yet. In particular, this means that the |
|
* callback will be called for some of the requests, for others it won't. The |
|
* caller must check the error field of the BlockRequest to wait for the right |
|
* callbacks (if error != 0, no callback will be called). |
|
* |
|
* The implementation may modify the contents of the reqs array, e.g. to merge |
|
* requests. However, the fields opaque and error are left unmodified as they |
|
* are used to signal failure for a single request to the caller. |
*/ |
*/ |
int64_t bdrv_getlength(BlockDriverState *bs) |
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
{ |
{ |
BlockDriver *drv = bs->drv; |
MultiwriteCB *mcb; |
if (!drv) |
int i; |
return -ENOMEDIUM; |
|
if (!drv->bdrv_getlength) { |
/* don't submit writes if we don't have a medium */ |
/* legacy mode */ |
if (bs->drv == NULL) { |
return bs->total_sectors * SECTOR_SIZE; |
for (i = 0; i < num_reqs; i++) { |
|
reqs[i].error = -ENOMEDIUM; |
|
} |
|
return -1; |
|
} |
|
|
|
if (num_reqs == 0) { |
|
return 0; |
} |
} |
return drv->bdrv_getlength(bs); |
|
|
// Create MultiwriteCB structure |
|
mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
|
mcb->num_requests = 0; |
|
mcb->num_callbacks = num_reqs; |
|
|
|
for (i = 0; i < num_reqs; i++) { |
|
mcb->callbacks[i].cb = reqs[i].cb; |
|
mcb->callbacks[i].opaque = reqs[i].opaque; |
|
} |
|
|
|
// Check for mergable requests |
|
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
|
|
|
trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
|
|
|
/* Run the aio requests. */ |
|
mcb->num_requests = num_reqs; |
|
for (i = 0; i < num_reqs; i++) { |
|
bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
|
reqs[i].nb_sectors, multiwrite_cb, mcb); |
|
} |
|
|
|
return 0; |
} |
} |
|
|
/* return 0 as number of sectors if no device present or error */ |
void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
|
{ |
{ |
int64_t length; |
acb->pool->cancel(acb); |
length = bdrv_getlength(bs); |
|
if (length < 0) |
|
length = 0; |
|
else |
|
length = length >> SECTOR_BITS; |
|
*nb_sectors_ptr = length; |
|
} |
} |
|
|
struct partition { |
/* block I/O throttling */ |
uint8_t boot_ind; /* 0x80 - active */ |
static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, |
uint8_t head; /* starting head */ |
bool is_write, double elapsed_time, uint64_t *wait) |
uint8_t sector; /* starting sector */ |
|
uint8_t cyl; /* starting cylinder */ |
|
uint8_t sys_ind; /* What partition type */ |
|
uint8_t end_head; /* end head */ |
|
uint8_t end_sector; /* end sector */ |
|
uint8_t end_cyl; /* end cylinder */ |
|
uint32_t start_sect; /* starting sector counting from 0 */ |
|
uint32_t nr_sects; /* nr of sectors in partition */ |
|
} __attribute__((packed)); |
|
|
|
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ |
|
static int guess_disk_lchs(BlockDriverState *bs, |
|
int *pcylinders, int *pheads, int *psectors) |
|
{ |
{ |
uint8_t buf[512]; |
uint64_t bps_limit = 0; |
int ret, i, heads, sectors, cylinders; |
double bytes_limit, bytes_base, bytes_res; |
struct partition *p; |
double slice_time, wait_time; |
uint32_t nr_sects; |
|
uint64_t nb_sectors; |
|
|
|
bdrv_get_geometry(bs, &nb_sectors); |
if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { |
|
bps_limit = bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; |
|
} else if (bs->io_limits.bps[is_write]) { |
|
bps_limit = bs->io_limits.bps[is_write]; |
|
} else { |
|
if (wait) { |
|
*wait = 0; |
|
} |
|
|
ret = bdrv_read(bs, 0, buf, 1); |
return false; |
if (ret < 0) |
} |
return -1; |
|
/* test msdos magic */ |
slice_time = bs->slice_end - bs->slice_start; |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
slice_time /= (NANOSECONDS_PER_SECOND); |
return -1; |
bytes_limit = bps_limit * slice_time; |
for(i = 0; i < 4; i++) { |
bytes_base = bs->nr_bytes[is_write] - bs->io_base.bytes[is_write]; |
p = ((struct partition *)(buf + 0x1be)) + i; |
if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { |
nr_sects = le32_to_cpu(p->nr_sects); |
bytes_base += bs->nr_bytes[!is_write] - bs->io_base.bytes[!is_write]; |
if (nr_sects && p->end_head) { |
} |
/* We make the assumption that the partition terminates on |
|
a cylinder boundary */ |
/* bytes_base: the bytes of data which have been read/written; and |
heads = p->end_head + 1; |
* it is obtained from the history statistic info. |
sectors = p->end_sector & 63; |
* bytes_res: the remaining bytes of data which need to be read/written. |
if (sectors == 0) |
* (bytes_base + bytes_res) / bps_limit: used to calcuate |
continue; |
* the total time for completing reading/writting all data. |
cylinders = nb_sectors / (heads * sectors); |
*/ |
if (cylinders < 1 || cylinders > 16383) |
bytes_res = (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
continue; |
|
*pheads = heads; |
if (bytes_base + bytes_res <= bytes_limit) { |
*psectors = sectors; |
if (wait) { |
*pcylinders = cylinders; |
*wait = 0; |
#if 0 |
|
printf("guessed geometry: LCHS=%d %d %d\n", |
|
cylinders, heads, sectors); |
|
#endif |
|
return 0; |
|
} |
} |
|
|
|
return false; |
} |
} |
return -1; |
|
|
/* Calc approx time to dispatch */ |
|
wait_time = (bytes_base + bytes_res) / bps_limit - elapsed_time; |
|
|
|
/* When the I/O rate at runtime exceeds the limits, |
|
* bs->slice_end need to be extended in order that the current statistic |
|
* info can be kept until the timer fire, so it is increased and tuned |
|
* based on the result of experiment. |
|
*/ |
|
bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; |
|
bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; |
|
if (wait) { |
|
*wait = wait_time * BLOCK_IO_SLICE_TIME * 10; |
|
} |
|
|
|
return true; |
} |
} |
|
|
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, |
|
double elapsed_time, uint64_t *wait) |
{ |
{ |
int translation, lba_detected = 0; |
uint64_t iops_limit = 0; |
int cylinders, heads, secs; |
double ios_limit, ios_base; |
uint64_t nb_sectors; |
double slice_time, wait_time; |
|
|
/* if a geometry hint is available, use it */ |
if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { |
bdrv_get_geometry(bs, &nb_sectors); |
iops_limit = bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
} else if (bs->io_limits.iops[is_write]) { |
translation = bdrv_get_translation_hint(bs); |
iops_limit = bs->io_limits.iops[is_write]; |
if (cylinders != 0) { |
|
*pcyls = cylinders; |
|
*pheads = heads; |
|
*psecs = secs; |
|
} else { |
} else { |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
if (wait) { |
if (heads > 16) { |
*wait = 0; |
/* if heads > 16, it means that a BIOS LBA |
} |
translation was active, so the default |
|
hardware geometry is OK */ |
|
lba_detected = 1; |
|
goto default_geometry; |
|
} else { |
|
*pcyls = cylinders; |
|
*pheads = heads; |
|
*psecs = secs; |
|
/* disable any translation to be in sync with |
|
the logical geometry */ |
|
if (translation == BIOS_ATA_TRANSLATION_AUTO) { |
|
bdrv_set_translation_hint(bs, |
|
BIOS_ATA_TRANSLATION_NONE); |
|
} |
|
} |
|
} else { |
|
default_geometry: |
|
/* if no geometry, use a standard physical disk geometry */ |
|
cylinders = nb_sectors / (16 * 63); |
|
|
|
if (cylinders > 16383) |
return false; |
cylinders = 16383; |
} |
else if (cylinders < 2) |
|
cylinders = 2; |
slice_time = bs->slice_end - bs->slice_start; |
*pcyls = cylinders; |
slice_time /= (NANOSECONDS_PER_SECOND); |
*pheads = 16; |
ios_limit = iops_limit * slice_time; |
*psecs = 63; |
ios_base = bs->nr_ops[is_write] - bs->io_base.ios[is_write]; |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { |
if ((*pcyls * *pheads) <= 131072) { |
ios_base += bs->nr_ops[!is_write] - bs->io_base.ios[!is_write]; |
bdrv_set_translation_hint(bs, |
} |
BIOS_ATA_TRANSLATION_LARGE); |
|
} else { |
if (ios_base + 1 <= ios_limit) { |
bdrv_set_translation_hint(bs, |
if (wait) { |
BIOS_ATA_TRANSLATION_LBA); |
*wait = 0; |
} |
|
} |
|
} |
} |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
|
|
return false; |
} |
} |
} |
|
|
|
void bdrv_set_geometry_hint(BlockDriverState *bs, |
/* Calc approx time to dispatch */ |
int cyls, int heads, int secs) |
wait_time = (ios_base + 1) / iops_limit; |
{ |
if (wait_time > elapsed_time) { |
bs->cyls = cyls; |
wait_time = wait_time - elapsed_time; |
bs->heads = heads; |
} else { |
bs->secs = secs; |
wait_time = 0; |
} |
} |
|
|
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; |
{ |
bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; |
bs->type = type; |
if (wait) { |
bs->removable = ((type == BDRV_TYPE_CDROM || |
*wait = wait_time * BLOCK_IO_SLICE_TIME * 10; |
type == BDRV_TYPE_FLOPPY)); |
} |
} |
|
|
|
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
return true; |
{ |
|
bs->translation = translation; |
|
} |
} |
|
|
void bdrv_get_geometry_hint(BlockDriverState *bs, |
static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, |
int *pcyls, int *pheads, int *psecs) |
bool is_write, int64_t *wait) |
{ |
{ |
*pcyls = bs->cyls; |
int64_t now, max_wait; |
*pheads = bs->heads; |
uint64_t bps_wait = 0, iops_wait = 0; |
*psecs = bs->secs; |
double elapsed_time; |
} |
int bps_ret, iops_ret; |
|
|
int bdrv_get_type_hint(BlockDriverState *bs) |
now = qemu_get_clock_ns(vm_clock); |
{ |
if ((bs->slice_start < now) |
return bs->type; |
&& (bs->slice_end > now)) { |
} |
bs->slice_end = now + bs->slice_time; |
|
} else { |
|
bs->slice_time = 5 * BLOCK_IO_SLICE_TIME; |
|
bs->slice_start = now; |
|
bs->slice_end = now + bs->slice_time; |
|
|
|
bs->io_base.bytes[is_write] = bs->nr_bytes[is_write]; |
|
bs->io_base.bytes[!is_write] = bs->nr_bytes[!is_write]; |
|
|
|
bs->io_base.ios[is_write] = bs->nr_ops[is_write]; |
|
bs->io_base.ios[!is_write] = bs->nr_ops[!is_write]; |
|
} |
|
|
|
elapsed_time = now - bs->slice_start; |
|
elapsed_time /= (NANOSECONDS_PER_SECOND); |
|
|
|
bps_ret = bdrv_exceed_bps_limits(bs, nb_sectors, |
|
is_write, elapsed_time, &bps_wait); |
|
iops_ret = bdrv_exceed_iops_limits(bs, is_write, |
|
elapsed_time, &iops_wait); |
|
if (bps_ret || iops_ret) { |
|
max_wait = bps_wait > iops_wait ? bps_wait : iops_wait; |
|
if (wait) { |
|
*wait = max_wait; |
|
} |
|
|
int bdrv_get_translation_hint(BlockDriverState *bs) |
now = qemu_get_clock_ns(vm_clock); |
{ |
if (bs->slice_end < now + max_wait) { |
return bs->translation; |
bs->slice_end = now + max_wait; |
} |
} |
|
|
int bdrv_is_removable(BlockDriverState *bs) |
return true; |
{ |
} |
return bs->removable; |
|
} |
|
|
|
int bdrv_is_read_only(BlockDriverState *bs) |
if (wait) { |
{ |
*wait = 0; |
return bs->read_only; |
} |
} |
|
|
|
int bdrv_is_sg(BlockDriverState *bs) |
return false; |
{ |
|
return bs->sg; |
|
} |
} |
|
|
/* XXX: no longer used */ |
/**************************************************************/ |
void bdrv_set_change_cb(BlockDriverState *bs, |
/* async block device emulation */ |
void (*change_cb)(void *opaque), void *opaque) |
|
{ |
|
bs->change_cb = change_cb; |
|
bs->change_opaque = opaque; |
|
} |
|
|
|
int bdrv_is_encrypted(BlockDriverState *bs) |
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) |
{ |
{ |
if (bs->backing_hd && bs->backing_hd->encrypted) |
BlockDriverAIOCBSync *acb = |
return 1; |
container_of(blockacb, BlockDriverAIOCBSync, common); |
return bs->encrypted; |
qemu_bh_delete(acb->bh); |
|
acb->bh = NULL; |
|
qemu_aio_release(acb); |
} |
} |
|
|
int bdrv_key_required(BlockDriverState *bs) |
static AIOPool bdrv_em_aio_pool = { |
|
.aiocb_size = sizeof(BlockDriverAIOCBSync), |
|
.cancel = bdrv_aio_cancel_em, |
|
}; |
|
|
|
static void bdrv_aio_bh_cb(void *opaque) |
{ |
{ |
BlockDriverState *backing_hd = bs->backing_hd; |
BlockDriverAIOCBSync *acb = opaque; |
|
|
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) |
if (!acb->is_write) |
return 1; |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
return (bs->encrypted && !bs->valid_key); |
qemu_vfree(acb->bounce); |
|
acb->common.cb(acb->common.opaque, acb->ret); |
|
qemu_bh_delete(acb->bh); |
|
acb->bh = NULL; |
|
qemu_aio_release(acb); |
} |
} |
|
|
int bdrv_set_key(BlockDriverState *bs, const char *key) |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
|
int64_t sector_num, |
|
QEMUIOVector *qiov, |
|
int nb_sectors, |
|
BlockDriverCompletionFunc *cb, |
|
void *opaque, |
|
int is_write) |
|
|
{ |
{ |
int ret; |
BlockDriverAIOCBSync *acb; |
if (bs->backing_hd && bs->backing_hd->encrypted) { |
|
ret = bdrv_set_key(bs->backing_hd, key); |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
if (ret < 0) |
acb->is_write = is_write; |
return ret; |
acb->qiov = qiov; |
if (!bs->encrypted) |
acb->bounce = qemu_blockalign(bs, qiov->size); |
return 0; |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
|
|
|
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); |
} |
} |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) |
|
return -1; |
qemu_bh_schedule(acb->bh); |
ret = bs->drv->bdrv_set_key(bs, key); |
|
bs->valid_key = (ret == 0); |
return &acb->common; |
return ret; |
|
} |
} |
|
|
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
if (!bs->drv) { |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
buf[0] = '\0'; |
|
} else { |
|
pstrcpy(buf, buf_size, bs->drv->format_name); |
|
} |
|
} |
} |
|
|
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
void *opaque) |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
BlockDriver *drv; |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
|
} |
|
|
for (drv = first_drv; drv != NULL; drv = drv->next) { |
|
it(opaque, drv->format_name); |
typedef struct BlockDriverAIOCBCoroutine { |
} |
BlockDriverAIOCB common; |
|
BlockRequest req; |
|
bool is_write; |
|
QEMUBH* bh; |
|
} BlockDriverAIOCBCoroutine; |
|
|
|
static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) |
|
{ |
|
qemu_aio_flush(); |
} |
} |
|
|
BlockDriverState *bdrv_find(const char *name) |
static AIOPool bdrv_em_co_aio_pool = { |
|
.aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
|
.cancel = bdrv_aio_co_cancel_em, |
|
}; |
|
|
|
static void bdrv_co_em_bh(void *opaque) |
{ |
{ |
BlockDriverState *bs; |
BlockDriverAIOCBCoroutine *acb = opaque; |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
acb->common.cb(acb->common.opaque, acb->req.error); |
if (!strcmp(name, bs->device_name)) |
qemu_bh_delete(acb->bh); |
return bs; |
qemu_aio_release(acb); |
} |
|
return NULL; |
|
} |
} |
|
|
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
/* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
|
static void coroutine_fn bdrv_co_do_rw(void *opaque) |
{ |
{ |
BlockDriverState *bs; |
BlockDriverAIOCBCoroutine *acb = opaque; |
|
BlockDriverState *bs = acb->common.bs; |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
if (!acb->is_write) { |
it(opaque, bs); |
acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, |
|
acb->req.nb_sectors, acb->req.qiov, 0); |
|
} else { |
|
acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, |
|
acb->req.nb_sectors, acb->req.qiov, 0); |
} |
} |
|
|
|
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
|
qemu_bh_schedule(acb->bh); |
} |
} |
|
|
const char *bdrv_get_device_name(BlockDriverState *bs) |
static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
{ |
int64_t sector_num, |
return bs->device_name; |
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; |
} |
} |
|
|
void bdrv_flush(BlockDriverState *bs) |
static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
{ |
{ |
if (bs->drv->bdrv_flush) |
BlockDriverAIOCBCoroutine *acb = opaque; |
bs->drv->bdrv_flush(bs); |
BlockDriverState *bs = acb->common.bs; |
if (bs->backing_hd) |
|
bdrv_flush(bs->backing_hd); |
acb->req.error = bdrv_co_flush(bs); |
|
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
|
qemu_bh_schedule(acb->bh); |
} |
} |
|
|
void bdrv_flush_all(void) |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
BlockDriverState *bs; |
trace_bdrv_aio_flush(bs, opaque); |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
Coroutine *co; |
if (bs->drv && !bdrv_is_read_only(bs) && |
BlockDriverAIOCBCoroutine *acb; |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
|
bdrv_flush(bs); |
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) |
* Returns true iff the specified sector is present in the disk image. Drivers |
|
* not implementing the functionality are assumed to not support backing files, |
|
* hence all their sectors are reported as allocated. |
|
* |
|
* 'pnum' is set to the number of sectors (including and immediately following |
|
* the specified sector) that are known to be in the same |
|
* allocated/unallocated state. |
|
* |
|
* 'nb_sectors' is the max value 'pnum' should be set to. |
|
*/ |
|
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
|
int *pnum) |
|
{ |
{ |
int64_t n; |
BlockDriverAIOCBCoroutine *acb = opaque; |
if (!bs->drv->bdrv_is_allocated) { |
BlockDriverState *bs = acb->common.bs; |
if (sector_num >= bs->total_sectors) { |
|
*pnum = 0; |
acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); |
return 0; |
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
} |
qemu_bh_schedule(acb->bh); |
n = bs->total_sectors - sector_num; |
|
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
|
return 1; |
|
} |
|
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); |
|
} |
} |
|
|
void bdrv_info(void) |
BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
BlockDriverState *bs; |
Coroutine *co; |
|
BlockDriverAIOCBCoroutine *acb; |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); |
term_printf("%s:", bs->device_name); |
|
term_printf(" type="); |
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
switch(bs->type) { |
acb->req.sector = sector_num; |
case BDRV_TYPE_HD: |
acb->req.nb_sectors = nb_sectors; |
term_printf("hd"); |
co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
break; |
qemu_coroutine_enter(co, acb); |
case BDRV_TYPE_CDROM: |
|
term_printf("cdrom"); |
return &acb->common; |
break; |
|
case BDRV_TYPE_FLOPPY: |
|
term_printf("floppy"); |
|
break; |
|
} |
|
term_printf(" removable=%d", bs->removable); |
|
if (bs->removable) { |
|
term_printf(" locked=%d", bs->locked); |
|
} |
|
if (bs->drv) { |
|
term_printf(" file="); |
|
term_print_filename(bs->filename); |
|
if (bs->backing_file[0] != '\0') { |
|
term_printf(" backing_file="); |
|
term_print_filename(bs->backing_file); |
|
} |
|
term_printf(" ro=%d", bs->read_only); |
|
term_printf(" drv=%s", bs->drv->format_name); |
|
term_printf(" encrypted=%d", bdrv_is_encrypted(bs)); |
|
} else { |
|
term_printf(" [not inserted]"); |
|
} |
|
term_printf("\n"); |
|
} |
|
} |
} |
|
|
/* The "info blockstats" command. */ |
void bdrv_init(void) |
void bdrv_info_stats (void) |
|
{ |
{ |
BlockDriverState *bs; |
module_call_init(MODULE_INIT_BLOCK); |
|
|
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
|
term_printf ("%s:" |
|
" rd_bytes=%" PRIu64 |
|
" wr_bytes=%" PRIu64 |
|
" rd_operations=%" PRIu64 |
|
" wr_operations=%" PRIu64 |
|
"\n", |
|
bs->device_name, |
|
bs->rd_bytes, bs->wr_bytes, |
|
bs->rd_ops, bs->wr_ops); |
|
} |
|
} |
} |
|
|
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
void bdrv_init_with_whitelist(void) |
{ |
{ |
if (bs->backing_hd && bs->backing_hd->encrypted) |
use_bdrv_whitelist = 1; |
return bs->backing_file; |
bdrv_init(); |
else if (bs->encrypted) |
|
return bs->filename; |
|
else |
|
return NULL; |
|
} |
} |
|
|
void bdrv_get_backing_filename(BlockDriverState *bs, |
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
char *filename, int filename_size) |
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
if (!bs->backing_hd) { |
BlockDriverAIOCB *acb; |
pstrcpy(filename, filename_size, ""); |
|
|
if (pool->free_aiocb) { |
|
acb = pool->free_aiocb; |
|
pool->free_aiocb = acb->next; |
} else { |
} else { |
pstrcpy(filename, filename_size, bs->backing_file); |
acb = g_malloc0(pool->aiocb_size); |
|
acb->pool = pool; |
} |
} |
|
acb->bs = bs; |
|
acb->cb = cb; |
|
acb->opaque = opaque; |
|
return acb; |
} |
} |
|
|
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
void qemu_aio_release(void *p) |
const uint8_t *buf, int nb_sectors) |
|
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
if (!drv) |
AIOPool *pool = acb->pool; |
return -ENOMEDIUM; |
acb->next = pool->free_aiocb; |
if (!drv->bdrv_write_compressed) |
pool->free_aiocb = acb; |
return -ENOTSUP; |
|
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
|
} |
} |
|
|
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
/**************************************************************/ |
{ |
/* Coroutine block device emulation */ |
BlockDriver *drv = bs->drv; |
|
if (!drv) |
typedef struct CoroutineIOCompletion { |
return -ENOMEDIUM; |
Coroutine *coroutine; |
if (!drv->bdrv_get_info) |
int ret; |
return -ENOTSUP; |
} CoroutineIOCompletion; |
memset(bdi, 0, sizeof(*bdi)); |
|
return drv->bdrv_get_info(bs, bdi); |
|
} |
|
|
|
int bdrv_put_buffer(BlockDriverState *bs, const uint8_t *buf, int64_t pos, int size) |
static void bdrv_co_io_em_complete(void *opaque, int ret) |
{ |
{ |
BlockDriver *drv = bs->drv; |
CoroutineIOCompletion *co = opaque; |
if (!drv) |
|
return -ENOMEDIUM; |
co->ret = ret; |
if (!drv->bdrv_put_buffer) |
qemu_coroutine_enter(co->coroutine, NULL); |
return -ENOTSUP; |
|
return drv->bdrv_put_buffer(bs, buf, pos, size); |
|
} |
} |
|
|
int bdrv_get_buffer(BlockDriverState *bs, uint8_t *buf, int64_t pos, int size) |
static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, |
|
int nb_sectors, QEMUIOVector *iov, |
|
bool is_write) |
{ |
{ |
BlockDriver *drv = bs->drv; |
CoroutineIOCompletion co = { |
if (!drv) |
.coroutine = qemu_coroutine_self(), |
return -ENOMEDIUM; |
}; |
if (!drv->bdrv_get_buffer) |
BlockDriverAIOCB *acb; |
return -ENOTSUP; |
|
return drv->bdrv_get_buffer(bs, buf, pos, size); |
|
} |
|
|
|
/**************************************************************/ |
if (is_write) { |
/* handling of snapshots */ |
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); |
|
} |
|
|
int bdrv_snapshot_create(BlockDriverState *bs, |
trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
QEMUSnapshotInfo *sn_info) |
if (!acb) { |
{ |
return -EIO; |
BlockDriver *drv = bs->drv; |
} |
if (!drv) |
qemu_coroutine_yield(); |
return -ENOMEDIUM; |
|
if (!drv->bdrv_snapshot_create) |
return co.ret; |
return -ENOTSUP; |
|
return drv->bdrv_snapshot_create(bs, sn_info); |
|
} |
} |
|
|
int bdrv_snapshot_goto(BlockDriverState *bs, |
static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
const char *snapshot_id) |
int64_t sector_num, int nb_sectors, |
|
QEMUIOVector *iov) |
{ |
{ |
BlockDriver *drv = bs->drv; |
return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); |
if (!drv) |
|
return -ENOMEDIUM; |
|
if (!drv->bdrv_snapshot_goto) |
|
return -ENOTSUP; |
|
return drv->bdrv_snapshot_goto(bs, snapshot_id); |
|
} |
} |
|
|
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, |
|
int64_t sector_num, int nb_sectors, |
|
QEMUIOVector *iov) |
{ |
{ |
BlockDriver *drv = bs->drv; |
return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); |
if (!drv) |
|
return -ENOMEDIUM; |
|
if (!drv->bdrv_snapshot_delete) |
|
return -ENOTSUP; |
|
return drv->bdrv_snapshot_delete(bs, snapshot_id); |
|
} |
} |
|
|
int bdrv_snapshot_list(BlockDriverState *bs, |
static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
QEMUSnapshotInfo **psn_info) |
|
{ |
{ |
BlockDriver *drv = bs->drv; |
RwCo *rwco = opaque; |
if (!drv) |
|
return -ENOMEDIUM; |
|
if (!drv->bdrv_snapshot_list) |
|
return -ENOTSUP; |
|
return drv->bdrv_snapshot_list(bs, psn_info); |
|
} |
|
|
|
#define NB_SUFFIXES 4 |
rwco->ret = bdrv_co_flush(rwco->bs); |
|
} |
|
|
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
int coroutine_fn bdrv_co_flush(BlockDriverState *bs) |
{ |
{ |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
int ret; |
int64_t base; |
|
int i; |
|
|
|
if (size <= 999) { |
if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
snprintf(buf, buf_size, "%" PRId64, size); |
return 0; |
} else { |
} |
base = 1024; |
|
for(i = 0; i < NB_SUFFIXES; i++) { |
/* Write back cached data to the OS even with cache=unsafe */ |
if (size < (10 * base)) { |
if (bs->drv->bdrv_co_flush_to_os) { |
snprintf(buf, buf_size, "%0.1f%c", |
ret = bs->drv->bdrv_co_flush_to_os(bs); |
(double)size / base, |
if (ret < 0) { |
suffixes[i]); |
return ret; |
break; |
|
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
|
snprintf(buf, buf_size, "%" PRId64 "%c", |
|
((size + (base >> 1)) / base), |
|
suffixes[i]); |
|
break; |
|
} |
|
base = base * 1024; |
|
} |
} |
} |
} |
return buf; |
|
} |
|
|
|
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
/* But don't actually force it to the disk with cache=unsafe */ |
{ |
if (bs->open_flags & BDRV_O_NO_FLUSH) { |
char buf1[128], date_buf[128], clock_buf[128]; |
return 0; |
#ifdef _WIN32 |
} |
struct tm *ptm; |
|
#else |
|
struct tm tm; |
|
#endif |
|
time_t ti; |
|
int64_t secs; |
|
|
|
if (!sn) { |
if (bs->drv->bdrv_co_flush_to_disk) { |
snprintf(buf, buf_size, |
ret = bs->drv->bdrv_co_flush_to_disk(bs); |
"%-10s%-20s%7s%20s%15s", |
} else if (bs->drv->bdrv_aio_flush) { |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
BlockDriverAIOCB *acb; |
|
CoroutineIOCompletion co = { |
|
.coroutine = qemu_coroutine_self(), |
|
}; |
|
|
|
acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); |
|
if (acb == NULL) { |
|
ret = -EIO; |
|
} else { |
|
qemu_coroutine_yield(); |
|
ret = co.ret; |
|
} |
} else { |
} else { |
ti = sn->date_sec; |
/* |
#ifdef _WIN32 |
* Some block drivers always operate in either writethrough or unsafe |
ptm = localtime(&ti); |
* mode and don't support bdrv_flush therefore. Usually qemu doesn't |
strftime(date_buf, sizeof(date_buf), |
* know how the server works (because the behaviour is hardcoded or |
"%Y-%m-%d %H:%M:%S", ptm); |
* depends on server-side configuration), so we can't ensure that |
#else |
* everything is safe on disk. Returning an error doesn't work because |
localtime_r(&ti, &tm); |
* that would break guests even if the server operates in writethrough |
strftime(date_buf, sizeof(date_buf), |
* mode. |
"%Y-%m-%d %H:%M:%S", &tm); |
* |
#endif |
* Let's hope the user knows what he's doing. |
secs = sn->vm_clock_nsec / 1000000000; |
*/ |
snprintf(clock_buf, sizeof(clock_buf), |
ret = 0; |
"%02d:%02d:%02d.%03d", |
|
(int)(secs / 3600), |
|
(int)((secs / 60) % 60), |
|
(int)(secs % 60), |
|
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
|
snprintf(buf, buf_size, |
|
"%-10s%-20s%7s%20s%15s", |
|
sn->id_str, sn->name, |
|
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), |
|
date_buf, |
|
clock_buf); |
|
} |
} |
return buf; |
if (ret < 0) { |
|
return ret; |
|
} |
|
|
|
/* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH |
|
* in the case of cache=unsafe, so there are no useless flushes. |
|
*/ |
|
return bdrv_co_flush(bs->file); |
} |
} |
|
|
|
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) |
/* async I/Os */ |
{ |
|
BlockDriverState *bs; |
|
|
typedef struct VectorTranslationState { |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
QEMUIOVector *iov; |
bdrv_invalidate_cache(bs); |
uint8_t *bounce; |
} |
int is_write; |
} |
BlockDriverAIOCB *aiocb; |
|
BlockDriverAIOCB *this_aiocb; |
|
} VectorTranslationState; |
|
|
|
static void bdrv_aio_rw_vector_cb(void *opaque, int ret) |
void bdrv_clear_incoming_migration_all(void) |
{ |
{ |
VectorTranslationState *s = opaque; |
BlockDriverState *bs; |
|
|
if (!s->is_write) { |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
qemu_iovec_from_buffer(s->iov, s->bounce, s->iov->size); |
bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); |
} |
} |
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, |
int bdrv_flush(BlockDriverState *bs) |
int64_t sector_num, |
|
QEMUIOVector *iov, |
|
int nb_sectors, |
|
BlockDriverCompletionFunc *cb, |
|
void *opaque, |
|
int is_write) |
|
|
|
{ |
{ |
VectorTranslationState *s = qemu_mallocz(sizeof(*s)); |
Coroutine *co; |
BlockDriverAIOCB *aiocb = qemu_aio_get(bs, cb, opaque); |
RwCo rwco = { |
|
.bs = bs, |
|
.ret = NOT_DONE, |
|
}; |
|
|
s->this_aiocb = aiocb; |
if (qemu_in_coroutine()) { |
s->iov = iov; |
/* Fast-path if already in coroutine context */ |
s->bounce = qemu_memalign(512, nb_sectors * 512); |
bdrv_flush_co_entry(&rwco); |
s->is_write = is_write; |
|
if (is_write) { |
|
qemu_iovec_to_buffer(s->iov, s->bounce); |
|
s->aiocb = bdrv_aio_write(bs, sector_num, s->bounce, nb_sectors, |
|
bdrv_aio_rw_vector_cb, s); |
|
} else { |
} else { |
s->aiocb = bdrv_aio_read(bs, sector_num, s->bounce, nb_sectors, |
co = qemu_coroutine_create(bdrv_flush_co_entry); |
bdrv_aio_rw_vector_cb, s); |
qemu_coroutine_enter(co, &rwco); |
|
while (rwco.ret == NOT_DONE) { |
|
qemu_aio_wait(); |
|
} |
} |
} |
return aiocb; |
|
|
return rwco.ret; |
} |
} |
|
|
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
QEMUIOVector *iov, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
|
{ |
{ |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
RwCo *rwco = opaque; |
return NULL; |
|
|
|
return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors, |
rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); |
cb, opaque, 0); |
|
} |
} |
|
|
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, |
QEMUIOVector *iov, int nb_sectors, |
int nb_sectors) |
BlockDriverCompletionFunc *cb, void *opaque) |
|
{ |
{ |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
if (!bs->drv) { |
return NULL; |
return -ENOMEDIUM; |
|
} else if (bdrv_check_request(bs, sector_num, nb_sectors)) { |
return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors, |
return -EIO; |
cb, opaque, 1); |
} 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; |
|
} |
} |
} |
|
|
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) |
uint8_t *buf, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
|
{ |
{ |
BlockDriver *drv = bs->drv; |
Coroutine *co; |
BlockDriverAIOCB *ret; |
RwCo rwco = { |
|
.bs = bs, |
if (!drv) |
.sector_num = sector_num, |
return NULL; |
.nb_sectors = nb_sectors, |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
.ret = NOT_DONE, |
return NULL; |
}; |
|
|
ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
if (qemu_in_coroutine()) { |
|
/* Fast-path if already in coroutine context */ |
if (ret) { |
bdrv_discard_co_entry(&rwco); |
/* Update stats even though technically transfer has not happened. */ |
} else { |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE; |
co = qemu_coroutine_create(bdrv_discard_co_entry); |
bs->rd_ops ++; |
qemu_coroutine_enter(co, &rwco); |
|
while (rwco.ret == NOT_DONE) { |
|
qemu_aio_wait(); |
|
} |
} |
} |
|
|
return ret; |
return rwco.ret; |
} |
} |
|
|
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
/**************************************************************/ |
const uint8_t *buf, int nb_sectors, |
/* removable device support */ |
BlockDriverCompletionFunc *cb, void *opaque) |
|
|
/** |
|
* Return TRUE if the media is present |
|
*/ |
|
int bdrv_is_inserted(BlockDriverState *bs) |
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockDriver *drv = bs->drv; |
BlockDriverAIOCB *ret; |
|
|
|
if (!drv) |
if (!drv) |
return NULL; |
return 0; |
if (bs->read_only) |
if (!drv->bdrv_is_inserted) |
return NULL; |
return 1; |
if (bdrv_check_request(bs, sector_num, nb_sectors)) |
return drv->bdrv_is_inserted(bs); |
return NULL; |
} |
|
|
ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
/** |
|
* Return whether the media changed since the last call to this |
|
* function, or -ENOTSUP if we don't know. Most drivers don't know. |
|
*/ |
|
int bdrv_media_changed(BlockDriverState *bs) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
|
if (ret) { |
if (drv && drv->bdrv_media_changed) { |
/* Update stats even though technically transfer has not happened. */ |
return drv->bdrv_media_changed(bs); |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE; |
|
bs->wr_ops ++; |
|
} |
} |
|
return -ENOTSUP; |
return ret; |
|
} |
} |
|
|
void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
/** |
|
* If eject_flag is TRUE, eject the media. Otherwise, close the tray |
|
*/ |
|
void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
{ |
{ |
BlockDriver *drv = acb->bs->drv; |
BlockDriver *drv = bs->drv; |
|
|
if (acb->cb == bdrv_aio_rw_vector_cb) { |
if (drv && drv->bdrv_eject) { |
VectorTranslationState *s = acb->opaque; |
drv->bdrv_eject(bs, eject_flag); |
acb = s->aiocb; |
|
} |
} |
|
|
drv->bdrv_aio_cancel(acb); |
if (bs->device_name[0] != '\0') { |
|
bdrv_emit_qmp_eject_event(bs, eject_flag); |
|
} |
} |
} |
|
|
|
/** |
|
* Lock or unlock the media (if it is locked, the user won't be able |
|
* to eject it manually). |
|
*/ |
|
void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
|
{ |
|
BlockDriver *drv = bs->drv; |
|
|
/**************************************************************/ |
trace_bdrv_lock_medium(bs, locked); |
/* async block device emulation */ |
|
|
|
static void bdrv_aio_bh_cb(void *opaque) |
if (drv && drv->bdrv_lock_medium) { |
{ |
drv->bdrv_lock_medium(bs, locked); |
BlockDriverAIOCBSync *acb = opaque; |
} |
acb->common.cb(acb->common.opaque, acb->ret); |
|
qemu_aio_release(acb); |
|
} |
} |
|
|
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
/* needed for generic scsi interface */ |
int64_t sector_num, uint8_t *buf, int nb_sectors, |
|
BlockDriverCompletionFunc *cb, void *opaque) |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
{ |
{ |
BlockDriverAIOCBSync *acb; |
BlockDriver *drv = bs->drv; |
int ret; |
|
|
|
acb = qemu_aio_get(bs, cb, opaque); |
if (drv && drv->bdrv_ioctl) |
if (!acb->bh) |
return drv->bdrv_ioctl(bs, req, buf); |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
return -ENOTSUP; |
ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
|
acb->ret = ret; |
|
qemu_bh_schedule(acb->bh); |
|
return &acb->common; |
|
} |
} |
|
|
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
unsigned long int req, void *buf, |
BlockDriverCompletionFunc *cb, void *opaque) |
BlockDriverCompletionFunc *cb, void *opaque) |
{ |
{ |
BlockDriverAIOCBSync *acb; |
BlockDriver *drv = bs->drv; |
int ret; |
|
|
|
acb = qemu_aio_get(bs, cb, opaque); |
if (drv && drv->bdrv_aio_ioctl) |
if (!acb->bh) |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
return NULL; |
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) |
void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
{ |
{ |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
bs->buffer_alignment = align; |
qemu_bh_cancel(acb->bh); |
|
qemu_aio_release(acb); |
|
} |
} |
|
|
/**************************************************************/ |
void *qemu_blockalign(BlockDriverState *bs, size_t size) |
/* sync block device emulation */ |
|
|
|
static void bdrv_rw_em_cb(void *opaque, int ret) |
|
{ |
{ |
*(int *)opaque = ret; |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
} |
} |
|
|
#define NOT_DONE 0x7fffffff |
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
|
|
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
|
uint8_t *buf, int nb_sectors) |
|
{ |
{ |
int async_ret; |
int64_t bitmap_size; |
BlockDriverAIOCB *acb; |
|
|
|
async_ret = NOT_DONE; |
bs->dirty_count = 0; |
acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
if (enable) { |
bdrv_rw_em_cb, &async_ret); |
if (!bs->dirty_bitmap) { |
if (acb == NULL) |
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
return -1; |
BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG - 1; |
|
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG; |
|
|
while (async_ret == NOT_DONE) { |
bs->dirty_bitmap = g_new0(unsigned long, bitmap_size); |
qemu_aio_wait(); |
} |
|
} else { |
|
if (bs->dirty_bitmap) { |
|
g_free(bs->dirty_bitmap); |
|
bs->dirty_bitmap = NULL; |
|
} |
} |
} |
|
|
return async_ret; |
|
} |
} |
|
|
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) |
const uint8_t *buf, int nb_sectors) |
|
{ |
{ |
int async_ret; |
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
BlockDriverAIOCB *acb; |
|
|
|
async_ret = NOT_DONE; |
if (bs->dirty_bitmap && |
acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
(sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { |
bdrv_rw_em_cb, &async_ret); |
return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
if (acb == NULL) |
(1UL << (chunk % (sizeof(unsigned long) * 8)))); |
return -1; |
} else { |
while (async_ret == NOT_DONE) { |
return 0; |
qemu_aio_wait(); |
|
} |
} |
return async_ret; |
|
} |
} |
|
|
void bdrv_init(void) |
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
|
int nr_sectors) |
{ |
{ |
bdrv_register(&bdrv_raw); |
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); |
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, |
int64_t bdrv_get_dirty_count(BlockDriverState *bs) |
void *opaque) |
|
{ |
{ |
BlockDriver *drv; |
return bs->dirty_count; |
BlockDriverAIOCB *acb; |
} |
|
|
drv = bs->drv; |
void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
if (drv->free_aiocb) { |
{ |
acb = drv->free_aiocb; |
assert(bs->in_use != in_use); |
drv->free_aiocb = acb->next; |
bs->in_use = in_use; |
} else { |
} |
acb = qemu_mallocz(drv->aiocb_size); |
|
|
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; |
} |
} |
acb->bs = bs; |
|
acb->cb = cb; |
|
acb->opaque = opaque; |
|
return acb; |
|
} |
} |
|
|
void qemu_aio_release(void *p) |
/* 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) |
{ |
{ |
BlockDriverAIOCB *acb = p; |
if (bdrv_iostatus_is_enabled(bs) && |
BlockDriver *drv = acb->bs->drv; |
bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
acb->next = drv->free_aiocb; |
assert(error >= 0); |
drv->free_aiocb = acb; |
bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
|
BLOCK_DEVICE_IO_STATUS_FAILED; |
|
} |
} |
} |
|
|
/**************************************************************/ |
void |
/* removable device support */ |
bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, |
|
enum BlockAcctType type) |
|
{ |
|
assert(type < BDRV_MAX_IOTYPE); |
|
|
/** |
cookie->bytes = bytes; |
* Return TRUE if the media is present |
cookie->start_time_ns = get_clock(); |
*/ |
cookie->type = type; |
int bdrv_is_inserted(BlockDriverState *bs) |
} |
|
|
|
void |
|
bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) |
{ |
{ |
BlockDriver *drv = bs->drv; |
assert(cookie->type < BDRV_MAX_IOTYPE); |
int ret; |
|
if (!drv) |
bs->nr_bytes[cookie->type] += cookie->bytes; |
return 0; |
bs->nr_ops[cookie->type]++; |
if (!drv->bdrv_is_inserted) |
bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
return 1; |
|
ret = drv->bdrv_is_inserted(bs); |
|
return ret; |
|
} |
} |
|
|
/** |
int bdrv_img_create(const char *filename, const char *fmt, |
* Return TRUE if the media changed since the last call to this |
const char *base_filename, const char *base_fmt, |
* function. It is currently only used for floppy disks |
char *options, uint64_t img_size, int flags) |
*/ |
|
int bdrv_media_changed(BlockDriverState *bs) |
|
{ |
{ |
BlockDriver *drv = bs->drv; |
QEMUOptionParameter *param = NULL, *create_options = NULL; |
int ret; |
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]; |
|
int back_flags; |
|
|
|
/* backing files always opened read-only */ |
|
back_flags = |
|
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
|
|
|
bs = bdrv_new(""); |
|
|
|
ret = bdrv_open(bs, backing_file->value.s, back_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); |
|
} |
|
|
if (!drv || !drv->bdrv_media_changed) |
|
ret = -ENOTSUP; |
|
else |
|
ret = drv->bdrv_media_changed(bs); |
|
if (ret == -ENOTSUP) |
|
ret = bs->media_changed; |
|
bs->media_changed = 0; |
|
return ret; |
return ret; |
} |
} |
|
|
/** |
void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs, |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray |
int64_t speed, BlockDriverCompletionFunc *cb, |
*/ |
void *opaque, Error **errp) |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
|
{ |
{ |
BlockDriver *drv = bs->drv; |
BlockJob *job; |
int ret; |
|
|
|
if (!drv || !drv->bdrv_eject) { |
if (bs->job || bdrv_in_use(bs)) { |
ret = -ENOTSUP; |
error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); |
} else { |
return NULL; |
ret = drv->bdrv_eject(bs, eject_flag); |
|
} |
} |
if (ret == -ENOTSUP) { |
bdrv_set_in_use(bs, 1); |
if (eject_flag) |
|
bdrv_close(bs); |
job = g_malloc0(job_type->instance_size); |
|
job->job_type = job_type; |
|
job->bs = bs; |
|
job->cb = cb; |
|
job->opaque = opaque; |
|
job->busy = true; |
|
bs->job = job; |
|
|
|
/* Only set speed when necessary to avoid NotSupported error */ |
|
if (speed != 0) { |
|
Error *local_err = NULL; |
|
|
|
block_job_set_speed(job, speed, &local_err); |
|
if (error_is_set(&local_err)) { |
|
bs->job = NULL; |
|
g_free(job); |
|
bdrv_set_in_use(bs, 0); |
|
error_propagate(errp, local_err); |
|
return NULL; |
|
} |
} |
} |
|
return job; |
} |
} |
|
|
int bdrv_is_locked(BlockDriverState *bs) |
void block_job_complete(BlockJob *job, int ret) |
{ |
{ |
return bs->locked; |
BlockDriverState *bs = job->bs; |
|
|
|
assert(bs->job == job); |
|
job->cb(job->opaque, ret); |
|
bs->job = NULL; |
|
g_free(job); |
|
bdrv_set_in_use(bs, 0); |
} |
} |
|
|
/** |
void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
* Lock or unlock the media (if it is locked, the user won't be able |
|
* to eject it manually). |
|
*/ |
|
void bdrv_set_locked(BlockDriverState *bs, int locked) |
|
{ |
{ |
BlockDriver *drv = bs->drv; |
Error *local_err = NULL; |
|
|
bs->locked = locked; |
if (!job->job_type->set_speed) { |
if (drv && drv->bdrv_set_locked) { |
error_set(errp, QERR_NOT_SUPPORTED); |
drv->bdrv_set_locked(bs, locked); |
return; |
} |
} |
|
job->job_type->set_speed(job, speed, &local_err); |
|
if (error_is_set(&local_err)) { |
|
error_propagate(errp, local_err); |
|
return; |
|
} |
|
|
|
job->speed = speed; |
} |
} |
|
|
/* needed for generic scsi interface */ |
void block_job_cancel(BlockJob *job) |
|
{ |
|
job->cancelled = true; |
|
if (job->co && !job->busy) { |
|
qemu_coroutine_enter(job->co, NULL); |
|
} |
|
} |
|
|
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
bool block_job_is_cancelled(BlockJob *job) |
{ |
{ |
BlockDriver *drv = bs->drv; |
return job->cancelled; |
|
} |
|
|
if (drv && drv->bdrv_ioctl) |
struct BlockCancelData { |
return drv->bdrv_ioctl(bs, req, buf); |
BlockJob *job; |
return -ENOTSUP; |
BlockDriverCompletionFunc *cb; |
|
void *opaque; |
|
bool cancelled; |
|
int ret; |
|
}; |
|
|
|
static void block_job_cancel_cb(void *opaque, int ret) |
|
{ |
|
struct BlockCancelData *data = opaque; |
|
|
|
data->cancelled = block_job_is_cancelled(data->job); |
|
data->ret = ret; |
|
data->cb(data->opaque, ret); |
|
} |
|
|
|
int block_job_cancel_sync(BlockJob *job) |
|
{ |
|
struct BlockCancelData data; |
|
BlockDriverState *bs = job->bs; |
|
|
|
assert(bs->job == job); |
|
|
|
/* Set up our own callback to store the result and chain to |
|
* the original callback. |
|
*/ |
|
data.job = job; |
|
data.cb = job->cb; |
|
data.opaque = job->opaque; |
|
data.ret = -EINPROGRESS; |
|
job->cb = block_job_cancel_cb; |
|
job->opaque = &data; |
|
block_job_cancel(job); |
|
while (data.ret == -EINPROGRESS) { |
|
qemu_aio_wait(); |
|
} |
|
return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret; |
|
} |
|
|
|
void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns) |
|
{ |
|
/* Check cancellation *before* setting busy = false, too! */ |
|
if (!block_job_is_cancelled(job)) { |
|
job->busy = false; |
|
co_sleep_ns(clock, ns); |
|
job->busy = true; |
|
} |
} |
} |