Revision 83f64091 block.c
| b/block.c | ||
|---|---|---|
| 32 | 32 |
#include <sys/disk.h> |
| 33 | 33 |
#endif |
| 34 | 34 |
|
| 35 |
#ifdef CONFIG_COCOA |
|
| 36 |
#include <paths.h> |
|
| 37 |
#include <sys/param.h> |
|
| 38 |
#include <IOKit/IOKitLib.h> |
|
| 39 |
#include <IOKit/IOBSD.h> |
|
| 40 |
#include <IOKit/storage/IOMediaBSDClient.h> |
|
| 41 |
#include <IOKit/storage/IOMedia.h> |
|
| 42 |
#include <IOKit/storage/IOCDMedia.h> |
|
| 43 |
//#include <IOKit/storage/IOCDTypes.h> |
|
| 44 |
#include <CoreFoundation/CoreFoundation.h> |
|
| 45 |
#endif |
|
| 46 |
|
|
| 47 |
#ifdef __sun__ |
|
| 48 |
#include <sys/dkio.h> |
|
| 49 |
#endif |
|
| 35 |
#define SECTOR_BITS 9 |
|
| 36 |
#define SECTOR_SIZE (1 << SECTOR_BITS) |
|
| 37 |
|
|
| 38 |
static int bdrv_aio_new_em(BlockDriverAIOCB *acb); |
|
| 39 |
static int bdrv_aio_read_em(BlockDriverAIOCB *acb, int64_t sector_num, |
|
| 40 |
uint8_t *buf, int nb_sectors); |
|
| 41 |
static int bdrv_aio_write_em(BlockDriverAIOCB *acb, int64_t sector_num, |
|
| 42 |
const uint8_t *buf, int nb_sectors); |
|
| 43 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
|
| 44 |
static void bdrv_aio_delete_em(BlockDriverAIOCB *acb); |
|
| 45 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
|
| 46 |
uint8_t *buf, int nb_sectors); |
|
| 47 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
|
| 48 |
const uint8_t *buf, int nb_sectors); |
|
| 50 | 49 |
|
| 51 | 50 |
static BlockDriverState *bdrv_first; |
| 52 | 51 |
static BlockDriver *first_drv; |
| 53 | 52 |
|
| 54 |
#ifdef CONFIG_COCOA |
|
| 55 |
static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator ); |
|
| 56 |
static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize ); |
|
| 53 |
#ifdef _WIN32 |
|
| 54 |
#define PATH_SEP '\\' |
|
| 55 |
#else |
|
| 56 |
#define PATH_SEP '/' |
|
| 57 |
#endif |
|
| 57 | 58 |
|
| 58 |
kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
|
|
| 59 |
int path_is_absolute(const char *path)
|
|
| 59 | 60 |
{
|
| 60 |
kern_return_t kernResult; |
|
| 61 |
mach_port_t masterPort; |
|
| 62 |
CFMutableDictionaryRef classesToMatch; |
|
| 63 |
|
|
| 64 |
kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort ); |
|
| 65 |
if ( KERN_SUCCESS != kernResult ) {
|
|
| 66 |
printf( "IOMasterPort returned %d\n", kernResult ); |
|
| 67 |
} |
|
| 68 |
|
|
| 69 |
classesToMatch = IOServiceMatching( kIOCDMediaClass ); |
|
| 70 |
if ( classesToMatch == NULL ) {
|
|
| 71 |
printf( "IOServiceMatching returned a NULL dictionary.\n" ); |
|
| 72 |
} else {
|
|
| 73 |
CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue ); |
|
| 74 |
} |
|
| 75 |
kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator ); |
|
| 76 |
if ( KERN_SUCCESS != kernResult ) |
|
| 77 |
{
|
|
| 78 |
printf( "IOServiceGetMatchingServices returned %d\n", kernResult ); |
|
| 79 |
} |
|
| 80 |
|
|
| 81 |
return kernResult; |
|
| 61 |
const char *p; |
|
| 62 |
p = strchr(path, ':'); |
|
| 63 |
if (p) |
|
| 64 |
p++; |
|
| 65 |
else |
|
| 66 |
p = path; |
|
| 67 |
return (*p == PATH_SEP); |
|
| 82 | 68 |
} |
| 83 | 69 |
|
| 84 |
kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize ) |
|
| 70 |
/* if filename is absolute, just copy it to dest. Otherwise, build a |
|
| 71 |
path to it by considering it is relative to base_path. URL are |
|
| 72 |
supported. */ |
|
| 73 |
void path_combine(char *dest, int dest_size, |
|
| 74 |
const char *base_path, |
|
| 75 |
const char *filename) |
|
| 85 | 76 |
{
|
| 86 |
io_object_t nextMedia; |
|
| 87 |
kern_return_t kernResult = KERN_FAILURE; |
|
| 88 |
*bsdPath = '\0'; |
|
| 89 |
nextMedia = IOIteratorNext( mediaIterator ); |
|
| 90 |
if ( nextMedia ) |
|
| 91 |
{
|
|
| 92 |
CFTypeRef bsdPathAsCFString; |
|
| 93 |
bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 ); |
|
| 94 |
if ( bsdPathAsCFString ) {
|
|
| 95 |
size_t devPathLength; |
|
| 96 |
strcpy( bsdPath, _PATH_DEV ); |
|
| 97 |
strcat( bsdPath, "r" ); |
|
| 98 |
devPathLength = strlen( bsdPath ); |
|
| 99 |
if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
|
|
| 100 |
kernResult = KERN_SUCCESS; |
|
| 101 |
} |
|
| 102 |
CFRelease( bsdPathAsCFString ); |
|
| 103 |
} |
|
| 104 |
IOObjectRelease( nextMedia ); |
|
| 77 |
const char *p, *p1; |
|
| 78 |
int len; |
|
| 79 |
|
|
| 80 |
if (dest_size <= 0) |
|
| 81 |
return; |
|
| 82 |
if (path_is_absolute(filename)) {
|
|
| 83 |
pstrcpy(dest, dest_size, filename); |
|
| 84 |
} else {
|
|
| 85 |
p = strchr(base_path, ':'); |
|
| 86 |
if (p) |
|
| 87 |
p++; |
|
| 88 |
else |
|
| 89 |
p = base_path; |
|
| 90 |
p1 = strrchr(base_path, PATH_SEP); |
|
| 91 |
if (p1) |
|
| 92 |
p1++; |
|
| 93 |
else |
|
| 94 |
p1 = base_path; |
|
| 95 |
if (p1 > p) |
|
| 96 |
p = p1; |
|
| 97 |
len = p - base_path; |
|
| 98 |
if (len > dest_size - 1) |
|
| 99 |
len = dest_size - 1; |
|
| 100 |
memcpy(dest, base_path, len); |
|
| 101 |
dest[len] = '\0'; |
|
| 102 |
pstrcat(dest, dest_size, filename); |
|
| 105 | 103 |
} |
| 106 |
|
|
| 107 |
return kernResult; |
|
| 108 | 104 |
} |
| 109 | 105 |
|
| 110 |
#endif |
|
| 111 | 106 |
|
| 112 | 107 |
void bdrv_register(BlockDriver *bdrv) |
| 113 | 108 |
{
|
| 109 |
if (!bdrv->bdrv_aio_new) {
|
|
| 110 |
/* add AIO emulation layer */ |
|
| 111 |
bdrv->bdrv_aio_new = bdrv_aio_new_em; |
|
| 112 |
bdrv->bdrv_aio_read = bdrv_aio_read_em; |
|
| 113 |
bdrv->bdrv_aio_write = bdrv_aio_write_em; |
|
| 114 |
bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; |
|
| 115 |
bdrv->bdrv_aio_delete = bdrv_aio_delete_em; |
|
| 116 |
} else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
|
|
| 117 |
/* add synchronous IO emulation layer */ |
|
| 118 |
bdrv->bdrv_read = bdrv_read_em; |
|
| 119 |
bdrv->bdrv_write = bdrv_write_em; |
|
| 120 |
} |
|
| 114 | 121 |
bdrv->next = first_drv; |
| 115 | 122 |
first_drv = bdrv; |
| 116 | 123 |
} |
| ... | ... | |
| 156 | 163 |
#ifdef _WIN32 |
| 157 | 164 |
void get_tmp_filename(char *filename, int size) |
| 158 | 165 |
{
|
| 159 |
char* p = strrchr(filename, '/'); |
|
| 160 |
|
|
| 161 |
if (p == NULL) |
|
| 162 |
return; |
|
| 163 |
|
|
| 164 |
/* XXX: find a better function */ |
|
| 165 |
tmpnam(p); |
|
| 166 |
*p = '/'; |
|
| 166 |
tmpnam(filename); |
|
| 167 | 167 |
} |
| 168 | 168 |
#else |
| 169 | 169 |
void get_tmp_filename(char *filename, int size) |
| ... | ... | |
| 176 | 176 |
} |
| 177 | 177 |
#endif |
| 178 | 178 |
|
| 179 |
static BlockDriver *find_protocol(const char *filename) |
|
| 180 |
{
|
|
| 181 |
BlockDriver *drv1; |
|
| 182 |
char protocol[128]; |
|
| 183 |
int len; |
|
| 184 |
const char *p; |
|
| 185 |
p = strchr(filename, ':'); |
|
| 186 |
if (!p) |
|
| 187 |
return &bdrv_raw; |
|
| 188 |
len = p - filename; |
|
| 189 |
if (len > sizeof(protocol) - 1) |
|
| 190 |
len = sizeof(protocol) - 1; |
|
| 191 |
#ifdef _WIN32 |
|
| 192 |
if (len == 1) {
|
|
| 193 |
/* specific win32 case for driver letters */ |
|
| 194 |
return &bdrv_raw; |
|
| 195 |
} |
|
| 196 |
#endif |
|
| 197 |
memcpy(protocol, filename, len); |
|
| 198 |
protocol[len] = '\0'; |
|
| 199 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
|
|
| 200 |
if (drv1->protocol_name && |
|
| 201 |
!strcmp(drv1->protocol_name, protocol)) |
|
| 202 |
return drv1; |
|
| 203 |
} |
|
| 204 |
return NULL; |
|
| 205 |
} |
|
| 206 |
|
|
| 179 | 207 |
/* XXX: force raw format if block or character device ? It would |
| 180 | 208 |
simplify the BSD case */ |
| 181 | 209 |
static BlockDriver *find_image_format(const char *filename) |
| 182 | 210 |
{
|
| 183 |
int fd, ret, score, score_max;
|
|
| 211 |
int ret, score, score_max; |
|
| 184 | 212 |
BlockDriver *drv1, *drv; |
| 185 |
uint8_t *buf; |
|
| 186 |
size_t bufsize = 1024; |
|
| 187 |
|
|
| 188 |
fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); |
|
| 189 |
if (fd < 0) {
|
|
| 190 |
buf = NULL; |
|
| 191 |
ret = 0; |
|
| 192 |
} else {
|
|
| 193 |
#ifdef DIOCGSECTORSIZE |
|
| 194 |
{
|
|
| 195 |
unsigned int sectorsize = 512; |
|
| 196 |
if (!ioctl(fd, DIOCGSECTORSIZE, §orsize) && |
|
| 197 |
sectorsize > bufsize) |
|
| 198 |
bufsize = sectorsize; |
|
| 199 |
} |
|
| 200 |
#endif |
|
| 201 |
#ifdef CONFIG_COCOA |
|
| 202 |
u_int32_t blockSize = 512; |
|
| 203 |
if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
|
|
| 204 |
bufsize = blockSize; |
|
| 205 |
} |
|
| 206 |
#endif |
|
| 207 |
buf = qemu_malloc(bufsize); |
|
| 208 |
if (!buf) |
|
| 209 |
return NULL; |
|
| 210 |
ret = read(fd, buf, bufsize); |
|
| 211 |
if (ret < 0) {
|
|
| 212 |
close(fd); |
|
| 213 |
qemu_free(buf); |
|
| 214 |
return NULL; |
|
| 215 |
} |
|
| 216 |
close(fd); |
|
| 217 |
} |
|
| 213 |
uint8_t buf[2048]; |
|
| 214 |
BlockDriverState *bs; |
|
| 218 | 215 |
|
| 219 |
drv = NULL; |
|
| 216 |
drv = find_protocol(filename); |
|
| 217 |
/* no need to test disk image formats for vvfat or host specific |
|
| 218 |
devices */ |
|
| 219 |
if (drv == &bdrv_vvfat) |
|
| 220 |
return drv; |
|
| 221 |
if (strstart(filename, "/dev/", NULL)) |
|
| 222 |
return &bdrv_raw; |
|
| 223 |
|
|
| 224 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
|
| 225 |
if (ret < 0) |
|
| 226 |
return NULL; |
|
| 227 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
|
| 228 |
bdrv_delete(bs); |
|
| 229 |
if (ret < 0) {
|
|
| 230 |
return NULL; |
|
| 231 |
} |
|
| 232 |
|
|
| 220 | 233 |
score_max = 0; |
| 221 | 234 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
|
| 222 |
score = drv1->bdrv_probe(buf, ret, filename); |
|
| 223 |
if (score > score_max) {
|
|
| 224 |
score_max = score; |
|
| 225 |
drv = drv1; |
|
| 235 |
if (drv1->bdrv_probe) {
|
|
| 236 |
score = drv1->bdrv_probe(buf, ret, filename); |
|
| 237 |
if (score > score_max) {
|
|
| 238 |
score_max = score; |
|
| 239 |
drv = drv1; |
|
| 240 |
} |
|
| 226 | 241 |
} |
| 227 | 242 |
} |
| 228 |
qemu_free(buf); |
|
| 229 | 243 |
return drv; |
| 230 | 244 |
} |
| 231 | 245 |
|
| 232 |
int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot)
|
|
| 246 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
|
|
| 233 | 247 |
{
|
| 234 |
#ifdef CONFIG_COCOA |
|
| 235 |
if ( strncmp( filename, "/dev/cdrom", 10 ) == 0 ) {
|
|
| 236 |
kern_return_t kernResult; |
|
| 237 |
io_iterator_t mediaIterator; |
|
| 238 |
char bsdPath[ MAXPATHLEN ]; |
|
| 239 |
int fd; |
|
| 240 |
|
|
| 241 |
kernResult = FindEjectableCDMedia( &mediaIterator ); |
|
| 242 |
kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) ); |
|
| 243 |
|
|
| 244 |
if ( bsdPath[ 0 ] != '\0' ) {
|
|
| 245 |
strcat(bsdPath,"s0"); |
|
| 246 |
/* some CDs don't have a partition 0 */ |
|
| 247 |
fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE); |
|
| 248 |
if (fd < 0) {
|
|
| 249 |
bsdPath[strlen(bsdPath)-1] = '1'; |
|
| 250 |
} else {
|
|
| 251 |
close(fd); |
|
| 252 |
} |
|
| 253 |
filename = bsdPath; |
|
| 254 |
} |
|
| 255 |
|
|
| 256 |
if ( mediaIterator ) |
|
| 257 |
IOObjectRelease( mediaIterator ); |
|
| 248 |
BlockDriverState *bs; |
|
| 249 |
int ret; |
|
| 250 |
|
|
| 251 |
bs = bdrv_new("");
|
|
| 252 |
if (!bs) |
|
| 253 |
return -ENOMEM; |
|
| 254 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); |
|
| 255 |
if (ret < 0) {
|
|
| 256 |
bdrv_delete(bs); |
|
| 257 |
return ret; |
|
| 258 | 258 |
} |
| 259 |
#endif |
|
| 260 |
return bdrv_open2(bs, filename, snapshot, NULL); |
|
| 259 |
*pbs = bs; |
|
| 260 |
return 0; |
|
| 261 |
} |
|
| 262 |
|
|
| 263 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
|
| 264 |
{
|
|
| 265 |
return bdrv_open2(bs, filename, flags, NULL); |
|
| 261 | 266 |
} |
| 262 | 267 |
|
| 263 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
|
|
| 268 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
|
|
| 264 | 269 |
BlockDriver *drv) |
| 265 | 270 |
{
|
| 266 |
int ret; |
|
| 271 |
int ret, open_flags;
|
|
| 267 | 272 |
char tmp_filename[1024]; |
| 273 |
char backing_filename[1024]; |
|
| 268 | 274 |
|
| 269 | 275 |
bs->read_only = 0; |
| 270 | 276 |
bs->is_temporary = 0; |
| 271 | 277 |
bs->encrypted = 0; |
| 272 | 278 |
|
| 273 |
if (snapshot) {
|
|
| 279 |
if (flags & BDRV_O_SNAPSHOT) {
|
|
| 274 | 280 |
BlockDriverState *bs1; |
| 275 | 281 |
int64_t total_size; |
| 276 | 282 |
|
| ... | ... | |
| 280 | 286 |
/* if there is a backing file, use it */ |
| 281 | 287 |
bs1 = bdrv_new("");
|
| 282 | 288 |
if (!bs1) {
|
| 283 |
return -1;
|
|
| 289 |
return -ENOMEM;
|
|
| 284 | 290 |
} |
| 285 | 291 |
if (bdrv_open(bs1, filename, 0) < 0) {
|
| 286 | 292 |
bdrv_delete(bs1); |
| 287 | 293 |
return -1; |
| 288 | 294 |
} |
| 289 |
total_size = bs1->total_sectors;
|
|
| 295 |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
|
|
| 290 | 296 |
bdrv_delete(bs1); |
| 291 | 297 |
|
| 292 | 298 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
| 293 |
/* XXX: use cow for linux as it is more efficient ? */ |
|
| 294 | 299 |
if (bdrv_create(&bdrv_qcow, tmp_filename, |
| 295 | 300 |
total_size, filename, 0) < 0) {
|
| 296 | 301 |
return -1; |
| ... | ... | |
| 300 | 305 |
} |
| 301 | 306 |
|
| 302 | 307 |
pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 303 |
if (!drv) {
|
|
| 304 |
drv = find_image_format(filename);
|
|
| 308 |
if (flags & BDRV_O_FILE) {
|
|
| 309 |
drv = find_protocol(filename);
|
|
| 305 | 310 |
if (!drv) |
| 306 |
return -1; |
|
| 311 |
return -ENOENT; |
|
| 312 |
} else {
|
|
| 313 |
if (!drv) {
|
|
| 314 |
drv = find_image_format(filename); |
|
| 315 |
if (!drv) |
|
| 316 |
return -1; |
|
| 317 |
} |
|
| 307 | 318 |
} |
| 308 | 319 |
bs->drv = drv; |
| 309 | 320 |
bs->opaque = qemu_mallocz(drv->instance_size); |
| 310 | 321 |
if (bs->opaque == NULL && drv->instance_size > 0) |
| 311 | 322 |
return -1; |
| 312 |
|
|
| 313 |
ret = drv->bdrv_open(bs, filename); |
|
| 323 |
/* Note: for compatibility, we open disk image files as RDWR, and |
|
| 324 |
RDONLY as fallback */ |
|
| 325 |
if (!(flags & BDRV_O_FILE)) |
|
| 326 |
open_flags = BDRV_O_RDWR; |
|
| 327 |
else |
|
| 328 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
|
| 329 |
ret = drv->bdrv_open(bs, filename, open_flags); |
|
| 330 |
if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
|
|
| 331 |
ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); |
|
| 332 |
bs->read_only = 1; |
|
| 333 |
} |
|
| 314 | 334 |
if (ret < 0) {
|
| 315 | 335 |
qemu_free(bs->opaque); |
| 316 |
return -1;
|
|
| 336 |
return ret;
|
|
| 317 | 337 |
} |
| 338 |
|
|
| 318 | 339 |
#ifndef _WIN32 |
| 319 | 340 |
if (bs->is_temporary) {
|
| 320 | 341 |
unlink(filename); |
| 321 | 342 |
} |
| 322 | 343 |
#endif |
| 323 |
if (bs->backing_file[0] != '\0' && drv->bdrv_is_allocated) {
|
|
| 344 |
if (bs->backing_file[0] != '\0') {
|
|
| 324 | 345 |
/* if there is a backing file, use it */ |
| 325 | 346 |
bs->backing_hd = bdrv_new("");
|
| 326 | 347 |
if (!bs->backing_hd) {
|
| ... | ... | |
| 328 | 349 |
bdrv_close(bs); |
| 329 | 350 |
return -1; |
| 330 | 351 |
} |
| 331 |
if (bdrv_open(bs->backing_hd, bs->backing_file, 0) < 0) |
|
| 352 |
path_combine(backing_filename, sizeof(backing_filename), |
|
| 353 |
filename, bs->backing_file); |
|
| 354 |
if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) |
|
| 332 | 355 |
goto fail; |
| 333 | 356 |
} |
| 334 | 357 |
|
| ... | ... | |
| 373 | 396 |
/* commit COW file into the raw image */ |
| 374 | 397 |
int bdrv_commit(BlockDriverState *bs) |
| 375 | 398 |
{
|
| 376 |
int64_t i; |
|
| 399 |
int64_t i, total_sectors;
|
|
| 377 | 400 |
int n, j; |
| 378 | 401 |
unsigned char sector[512]; |
| 379 | 402 |
|
| ... | ... | |
| 388 | 411 |
return -ENOTSUP; |
| 389 | 412 |
} |
| 390 | 413 |
|
| 391 |
for (i = 0; i < bs->total_sectors;) {
|
|
| 414 |
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
|
| 415 |
for (i = 0; i < total_sectors;) {
|
|
| 392 | 416 |
if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) {
|
| 393 | 417 |
for(j = 0; j < n; j++) {
|
| 394 | 418 |
if (bdrv_read(bs, i, sector, 1) != 0) {
|
| ... | ... | |
| 411 | 435 |
return 0; |
| 412 | 436 |
} |
| 413 | 437 |
|
| 414 |
/* return -1 if error */
|
|
| 438 |
/* return < 0 if error */
|
|
| 415 | 439 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
| 416 | 440 |
uint8_t *buf, int nb_sectors) |
| 417 | 441 |
{
|
| 418 |
int ret, n; |
|
| 419 | 442 |
BlockDriver *drv = bs->drv; |
| 420 | 443 |
|
| 421 | 444 |
if (!bs->inserted) |
| 422 | 445 |
return -1; |
| 423 | 446 |
|
| 424 |
while (nb_sectors > 0) {
|
|
| 425 |
if (sector_num == 0 && bs->boot_sector_enabled) {
|
|
| 447 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
|
|
| 426 | 448 |
memcpy(buf, bs->boot_sector_data, 512); |
| 427 |
n = 1; |
|
| 428 |
} else if (bs->backing_hd) {
|
|
| 429 |
if (drv->bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) {
|
|
| 430 |
ret = drv->bdrv_read(bs, sector_num, buf, n); |
|
| 431 |
if (ret < 0) |
|
| 432 |
return -1; |
|
| 433 |
} else {
|
|
| 434 |
/* read from the base image */ |
|
| 435 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
|
| 436 |
if (ret < 0) |
|
| 437 |
return -1; |
|
| 438 |
} |
|
| 439 |
} else {
|
|
| 440 |
ret = drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
|
| 441 |
if (ret < 0) |
|
| 442 |
return -1; |
|
| 443 |
/* no need to loop */ |
|
| 444 |
break; |
|
| 445 |
} |
|
| 446 |
nb_sectors -= n; |
|
| 447 |
sector_num += n; |
|
| 448 |
buf += n * 512; |
|
| 449 |
sector_num++; |
|
| 450 |
nb_sectors--; |
|
| 451 |
buf += 512; |
|
| 452 |
if (nb_sectors == 0) |
|
| 453 |
return 0; |
|
| 454 |
} |
|
| 455 |
if (drv->bdrv_pread) {
|
|
| 456 |
int ret, len; |
|
| 457 |
len = nb_sectors * 512; |
|
| 458 |
ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); |
|
| 459 |
if (ret < 0) |
|
| 460 |
return ret; |
|
| 461 |
else if (ret != len) |
|
| 462 |
return -EIO; |
|
| 463 |
else |
|
| 464 |
return 0; |
|
| 465 |
} else {
|
|
| 466 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
|
| 449 | 467 |
} |
| 450 |
return 0; |
|
| 451 | 468 |
} |
| 452 | 469 |
|
| 453 |
/* return -1 if error */
|
|
| 470 |
/* return < 0 if error */
|
|
| 454 | 471 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
| 455 | 472 |
const uint8_t *buf, int nb_sectors) |
| 456 | 473 |
{
|
| 474 |
BlockDriver *drv = bs->drv; |
|
| 457 | 475 |
if (!bs->inserted) |
| 458 | 476 |
return -1; |
| 459 | 477 |
if (bs->read_only) |
| ... | ... | |
| 461 | 479 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
|
| 462 | 480 |
memcpy(bs->boot_sector_data, buf, 512); |
| 463 | 481 |
} |
| 464 |
return bs->drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
|
| 482 |
if (drv->bdrv_pwrite) {
|
|
| 483 |
int ret, len; |
|
| 484 |
len = nb_sectors * 512; |
|
| 485 |
ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len); |
|
| 486 |
if (ret < 0) |
|
| 487 |
return ret; |
|
| 488 |
else if (ret != len) |
|
| 489 |
return -EIO; |
|
| 490 |
else |
|
| 491 |
return 0; |
|
| 492 |
} else {
|
|
| 493 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
|
| 494 |
} |
|
| 495 |
} |
|
| 496 |
|
|
| 497 |
#if 0 |
|
| 498 |
/* not necessary now */ |
|
| 499 |
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
|
| 500 |
void *buf1, int count1) |
|
| 501 |
{
|
|
| 502 |
uint8_t *buf = buf1; |
|
| 503 |
uint8_t tmp_buf[SECTOR_SIZE]; |
|
| 504 |
int len, nb_sectors, count; |
|
| 505 |
int64_t sector_num; |
|
| 506 |
|
|
| 507 |
count = count1; |
|
| 508 |
/* first read to align to sector start */ |
|
| 509 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); |
|
| 510 |
if (len > count) |
|
| 511 |
len = count; |
|
| 512 |
sector_num = offset >> SECTOR_BITS; |
|
| 513 |
if (len > 0) {
|
|
| 514 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
|
| 515 |
return -EIO; |
|
| 516 |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); |
|
| 517 |
count -= len; |
|
| 518 |
if (count == 0) |
|
| 519 |
return count1; |
|
| 520 |
sector_num++; |
|
| 521 |
buf += len; |
|
| 522 |
} |
|
| 523 |
|
|
| 524 |
/* read the sectors "in place" */ |
|
| 525 |
nb_sectors = count >> SECTOR_BITS; |
|
| 526 |
if (nb_sectors > 0) {
|
|
| 527 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
|
| 528 |
return -EIO; |
|
| 529 |
sector_num += nb_sectors; |
|
| 530 |
len = nb_sectors << SECTOR_BITS; |
|
| 531 |
buf += len; |
|
| 532 |
count -= len; |
|
| 533 |
} |
|
| 534 |
|
|
| 535 |
/* add data from the last sector */ |
|
| 536 |
if (count > 0) {
|
|
| 537 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
|
| 538 |
return -EIO; |
|
| 539 |
memcpy(buf, tmp_buf, count); |
|
| 540 |
} |
|
| 541 |
return count1; |
|
| 542 |
} |
|
| 543 |
|
|
| 544 |
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
|
| 545 |
const void *buf1, int count1) |
|
| 546 |
{
|
|
| 547 |
const uint8_t *buf = buf1; |
|
| 548 |
uint8_t tmp_buf[SECTOR_SIZE]; |
|
| 549 |
int len, nb_sectors, count; |
|
| 550 |
int64_t sector_num; |
|
| 551 |
|
|
| 552 |
count = count1; |
|
| 553 |
/* first write to align to sector start */ |
|
| 554 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); |
|
| 555 |
if (len > count) |
|
| 556 |
len = count; |
|
| 557 |
sector_num = offset >> SECTOR_BITS; |
|
| 558 |
if (len > 0) {
|
|
| 559 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
|
| 560 |
return -EIO; |
|
| 561 |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); |
|
| 562 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
|
| 563 |
return -EIO; |
|
| 564 |
count -= len; |
|
| 565 |
if (count == 0) |
|
| 566 |
return count1; |
|
| 567 |
sector_num++; |
|
| 568 |
buf += len; |
|
| 569 |
} |
|
| 570 |
|
|
| 571 |
/* write the sectors "in place" */ |
|
| 572 |
nb_sectors = count >> SECTOR_BITS; |
|
| 573 |
if (nb_sectors > 0) {
|
|
| 574 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
|
| 575 |
return -EIO; |
|
| 576 |
sector_num += nb_sectors; |
|
| 577 |
len = nb_sectors << SECTOR_BITS; |
|
| 578 |
buf += len; |
|
| 579 |
count -= len; |
|
| 580 |
} |
|
| 581 |
|
|
| 582 |
/* add data from the last sector */ |
|
| 583 |
if (count > 0) {
|
|
| 584 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
|
| 585 |
return -EIO; |
|
| 586 |
memcpy(tmp_buf, buf, count); |
|
| 587 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
|
| 588 |
return -EIO; |
|
| 589 |
} |
|
| 590 |
return count1; |
|
| 591 |
} |
|
| 592 |
#endif |
|
| 593 |
|
|
| 594 |
/** |
|
| 595 |
* Read with byte offsets (needed only for file protocols) |
|
| 596 |
*/ |
|
| 597 |
int bdrv_pread(BlockDriverState *bs, int64_t offset, |
|
| 598 |
void *buf1, int count1) |
|
| 599 |
{
|
|
| 600 |
BlockDriver *drv = bs->drv; |
|
| 601 |
|
|
| 602 |
if (!drv) |
|
| 603 |
return -ENOENT; |
|
| 604 |
if (!drv->bdrv_pread) |
|
| 605 |
return -ENOTSUP; |
|
| 606 |
return drv->bdrv_pread(bs, offset, buf1, count1); |
|
| 607 |
} |
|
| 608 |
|
|
| 609 |
/** |
|
| 610 |
* Write with byte offsets (needed only for file protocols) |
|
| 611 |
*/ |
|
| 612 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
|
| 613 |
const void *buf1, int count1) |
|
| 614 |
{
|
|
| 615 |
BlockDriver *drv = bs->drv; |
|
| 616 |
|
|
| 617 |
if (!drv) |
|
| 618 |
return -ENOENT; |
|
| 619 |
if (!drv->bdrv_pwrite) |
|
| 620 |
return -ENOTSUP; |
|
| 621 |
return drv->bdrv_pwrite(bs, offset, buf1, count1); |
|
| 622 |
} |
|
| 623 |
|
|
| 624 |
/** |
|
| 625 |
* Truncate file to 'offset' bytes (needed only for file protocols) |
|
| 626 |
*/ |
|
| 627 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset) |
|
| 628 |
{
|
|
| 629 |
BlockDriver *drv = bs->drv; |
|
| 630 |
if (!drv) |
|
| 631 |
return -ENOENT; |
|
| 632 |
if (!drv->bdrv_truncate) |
|
| 633 |
return -ENOTSUP; |
|
| 634 |
return drv->bdrv_truncate(bs, offset); |
|
| 635 |
} |
|
| 636 |
|
|
| 637 |
/** |
|
| 638 |
* Length of a file in bytes. Return < 0 if error or unknown. |
|
| 639 |
*/ |
|
| 640 |
int64_t bdrv_getlength(BlockDriverState *bs) |
|
| 641 |
{
|
|
| 642 |
BlockDriver *drv = bs->drv; |
|
| 643 |
if (!drv) |
|
| 644 |
return -ENOENT; |
|
| 645 |
if (!drv->bdrv_getlength) {
|
|
| 646 |
/* legacy mode */ |
|
| 647 |
return bs->total_sectors * SECTOR_SIZE; |
|
| 648 |
} |
|
| 649 |
return drv->bdrv_getlength(bs); |
|
| 465 | 650 |
} |
| 466 | 651 |
|
| 467 | 652 |
void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr) |
| 468 | 653 |
{
|
| 469 |
*nb_sectors_ptr = bs->total_sectors; |
|
| 654 |
int64_t size; |
|
| 655 |
size = bdrv_getlength(bs); |
|
| 656 |
if (size < 0) |
|
| 657 |
size = 0; |
|
| 658 |
*nb_sectors_ptr = size >> SECTOR_BITS; |
|
| 470 | 659 |
} |
| 471 | 660 |
|
| 472 | 661 |
/* force a given boot sector. */ |
| ... | ... | |
| 660 | 849 |
} |
| 661 | 850 |
} |
| 662 | 851 |
|
| 852 |
void bdrv_get_backing_filename(BlockDriverState *bs, |
|
| 853 |
char *filename, int filename_size) |
|
| 854 |
{
|
|
| 855 |
if (!bs->backing_hd) {
|
|
| 856 |
pstrcpy(filename, filename_size, ""); |
|
| 857 |
} else {
|
|
| 858 |
pstrcpy(filename, filename_size, bs->backing_file); |
|
| 859 |
} |
|
| 860 |
} |
|
| 861 |
|
|
| 862 |
|
|
| 663 | 863 |
/**************************************************************/ |
| 664 |
/* RAW block driver */
|
|
| 864 |
/* async I/Os */
|
|
| 665 | 865 |
|
| 666 |
typedef struct BDRVRawState {
|
|
| 667 |
int fd; |
|
| 668 |
} BDRVRawState; |
|
| 866 |
BlockDriverAIOCB *bdrv_aio_new(BlockDriverState *bs) |
|
| 867 |
{
|
|
| 868 |
BlockDriver *drv = bs->drv; |
|
| 869 |
BlockDriverAIOCB *acb; |
|
| 870 |
acb = qemu_mallocz(sizeof(BlockDriverAIOCB)); |
|
| 871 |
if (!acb) |
|
| 872 |
return NULL; |
|
| 873 |
|
|
| 874 |
acb->bs = bs; |
|
| 875 |
if (drv->bdrv_aio_new(acb) < 0) {
|
|
| 876 |
qemu_free(acb); |
|
| 877 |
return NULL; |
|
| 878 |
} |
|
| 879 |
return acb; |
|
| 880 |
} |
|
| 669 | 881 |
|
| 670 |
static int raw_probe(const uint8_t *buf, int buf_size, const char *filename) |
|
| 882 |
int bdrv_aio_read(BlockDriverAIOCB *acb, int64_t sector_num, |
|
| 883 |
uint8_t *buf, int nb_sectors, |
|
| 884 |
BlockDriverCompletionFunc *cb, void *opaque) |
|
| 671 | 885 |
{
|
| 672 |
return 1; /* maybe */ |
|
| 886 |
BlockDriverState *bs = acb->bs; |
|
| 887 |
BlockDriver *drv = bs->drv; |
|
| 888 |
|
|
| 889 |
if (!bs->inserted) |
|
| 890 |
return -1; |
|
| 891 |
|
|
| 892 |
/* XXX: we assume that nb_sectors == 0 is suppored by the async read */ |
|
| 893 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
|
|
| 894 |
memcpy(buf, bs->boot_sector_data, 512); |
|
| 895 |
sector_num++; |
|
| 896 |
nb_sectors--; |
|
| 897 |
buf += 512; |
|
| 898 |
} |
|
| 899 |
|
|
| 900 |
acb->cb = cb; |
|
| 901 |
acb->cb_opaque = opaque; |
|
| 902 |
return drv->bdrv_aio_read(acb, sector_num, buf, nb_sectors); |
|
| 673 | 903 |
} |
| 674 | 904 |
|
| 675 |
static int raw_open(BlockDriverState *bs, const char *filename) |
|
| 905 |
int bdrv_aio_write(BlockDriverAIOCB *acb, int64_t sector_num, |
|
| 906 |
const uint8_t *buf, int nb_sectors, |
|
| 907 |
BlockDriverCompletionFunc *cb, void *opaque) |
|
| 676 | 908 |
{
|
| 677 |
BDRVRawState *s = bs->opaque; |
|
| 678 |
int fd; |
|
| 679 |
int64_t size; |
|
| 680 |
#ifdef _BSD |
|
| 681 |
struct stat sb; |
|
| 682 |
#endif |
|
| 683 |
#ifdef __sun__ |
|
| 684 |
struct dk_minfo minfo; |
|
| 685 |
int rv; |
|
| 686 |
#endif |
|
| 909 |
BlockDriverState *bs = acb->bs; |
|
| 910 |
BlockDriver *drv = bs->drv; |
|
| 687 | 911 |
|
| 688 |
fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE); |
|
| 689 |
if (fd < 0) {
|
|
| 690 |
fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); |
|
| 691 |
if (fd < 0) |
|
| 912 |
if (!bs->inserted) |
|
| 692 | 913 |
return -1; |
| 693 |
bs->read_only = 1; |
|
| 914 |
if (bs->read_only) |
|
| 915 |
return -1; |
|
| 916 |
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
|
|
| 917 |
memcpy(bs->boot_sector_data, buf, 512); |
|
| 694 | 918 |
} |
| 695 |
#ifdef _BSD |
|
| 696 |
if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
|
|
| 697 |
#ifdef DIOCGMEDIASIZE |
|
| 698 |
if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size)) |
|
| 699 |
#endif |
|
| 700 |
#ifdef CONFIG_COCOA |
|
| 701 |
size = LONG_LONG_MAX; |
|
| 702 |
#else |
|
| 703 |
size = lseek(fd, 0LL, SEEK_END); |
|
| 704 |
#endif |
|
| 705 |
} else |
|
| 706 |
#endif |
|
| 707 |
#ifdef __sun__ |
|
| 708 |
/* |
|
| 709 |
* use the DKIOCGMEDIAINFO ioctl to read the size. |
|
| 710 |
*/ |
|
| 711 |
rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo ); |
|
| 712 |
if ( rv != -1 ) {
|
|
| 713 |
size = minfo.dki_lbsize * minfo.dki_capacity; |
|
| 714 |
} else /* there are reports that lseek on some devices |
|
| 715 |
fails, but irc discussion said that contingency |
|
| 716 |
on contingency was overkill */ |
|
| 717 |
#endif |
|
| 919 |
|
|
| 920 |
acb->cb = cb; |
|
| 921 |
acb->cb_opaque = opaque; |
|
| 922 |
return drv->bdrv_aio_write(acb, sector_num, buf, nb_sectors); |
|
| 923 |
} |
|
| 924 |
|
|
| 925 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
|
| 718 | 926 |
{
|
| 719 |
size = lseek(fd, 0, SEEK_END); |
|
| 927 |
BlockDriverState *bs = acb->bs; |
|
| 928 |
BlockDriver *drv = bs->drv; |
|
| 929 |
|
|
| 930 |
drv->bdrv_aio_cancel(acb); |
|
| 720 | 931 |
} |
| 721 |
#ifdef _WIN32 |
|
| 722 |
/* On Windows hosts it can happen that we're unable to get file size |
|
| 723 |
for CD-ROM raw device (it's inherent limitation of the CDFS driver). */ |
|
| 724 |
if (size == -1) |
|
| 725 |
size = LONG_LONG_MAX; |
|
| 726 |
#endif |
|
| 727 |
bs->total_sectors = size / 512; |
|
| 728 |
s->fd = fd; |
|
| 932 |
|
|
| 933 |
void bdrv_aio_delete(BlockDriverAIOCB *acb) |
|
| 934 |
{
|
|
| 935 |
BlockDriverState *bs = acb->bs; |
|
| 936 |
BlockDriver *drv = bs->drv; |
|
| 937 |
|
|
| 938 |
drv->bdrv_aio_delete(acb); |
|
| 939 |
qemu_free(acb); |
|
| 940 |
} |
|
| 941 |
|
|
| 942 |
/**************************************************************/ |
|
| 943 |
/* async block device emulation */ |
|
| 944 |
|
|
| 945 |
#ifdef QEMU_TOOL |
|
| 946 |
static int bdrv_aio_new_em(BlockDriverAIOCB *acb) |
|
| 947 |
{
|
|
| 729 | 948 |
return 0; |
| 730 | 949 |
} |
| 731 | 950 |
|
| 732 |
static int raw_read(BlockDriverState *bs, int64_t sector_num,
|
|
| 951 |
static int bdrv_aio_read_em(BlockDriverAIOCB *acb, int64_t sector_num,
|
|
| 733 | 952 |
uint8_t *buf, int nb_sectors) |
| 734 | 953 |
{
|
| 735 |
BDRVRawState *s = bs->opaque; |
|
| 736 | 954 |
int ret; |
| 737 |
|
|
| 738 |
lseek(s->fd, sector_num * 512, SEEK_SET); |
|
| 739 |
ret = read(s->fd, buf, nb_sectors * 512); |
|
| 740 |
if (ret != nb_sectors * 512) |
|
| 741 |
return -1; |
|
| 955 |
ret = bdrv_read(acb->bs, sector_num, buf, nb_sectors); |
|
| 956 |
acb->cb(acb->cb_opaque, ret); |
|
| 742 | 957 |
return 0; |
| 743 | 958 |
} |
| 744 | 959 |
|
| 745 |
static int raw_write(BlockDriverState *bs, int64_t sector_num,
|
|
| 960 |
static int bdrv_aio_write_em(BlockDriverAIOCB *acb, int64_t sector_num,
|
|
| 746 | 961 |
const uint8_t *buf, int nb_sectors) |
| 747 | 962 |
{
|
| 748 |
BDRVRawState *s = bs->opaque; |
|
| 749 | 963 |
int ret; |
| 750 |
|
|
| 751 |
lseek(s->fd, sector_num * 512, SEEK_SET); |
|
| 752 |
ret = write(s->fd, buf, nb_sectors * 512); |
|
| 753 |
if (ret != nb_sectors * 512) |
|
| 754 |
return -1; |
|
| 964 |
ret = bdrv_write(acb->bs, sector_num, buf, nb_sectors); |
|
| 965 |
acb->cb(acb->cb_opaque, ret); |
|
| 755 | 966 |
return 0; |
| 756 | 967 |
} |
| 757 | 968 |
|
| 758 |
static void raw_close(BlockDriverState *bs)
|
|
| 969 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
|
|
| 759 | 970 |
{
|
| 760 |
BDRVRawState *s = bs->opaque; |
|
| 761 |
close(s->fd); |
|
| 762 | 971 |
} |
| 763 | 972 |
|
| 764 |
#ifdef _WIN32 |
|
| 765 |
#include <windows.h> |
|
| 766 |
#include <winioctl.h> |
|
| 767 |
|
|
| 768 |
int qemu_ftruncate64(int fd, int64_t length) |
|
| 973 |
static void bdrv_aio_delete_em(BlockDriverAIOCB *acb) |
|
| 769 | 974 |
{
|
| 770 |
LARGE_INTEGER li; |
|
| 771 |
LONG high; |
|
| 772 |
HANDLE h; |
|
| 773 |
BOOL res; |
|
| 774 |
|
|
| 775 |
if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0) |
|
| 776 |
return -1; |
|
| 975 |
} |
|
| 976 |
#else |
|
| 977 |
typedef struct BlockDriverAIOCBSync {
|
|
| 978 |
QEMUBH *bh; |
|
| 979 |
int ret; |
|
| 980 |
} BlockDriverAIOCBSync; |
|
| 777 | 981 |
|
| 778 |
h = (HANDLE)_get_osfhandle(fd); |
|
| 982 |
static void bdrv_aio_bh_cb(void *opaque) |
|
| 983 |
{
|
|
| 984 |
BlockDriverAIOCB *acb = opaque; |
|
| 985 |
BlockDriverAIOCBSync *acb1 = acb->opaque; |
|
| 986 |
acb->cb(acb->cb_opaque, acb1->ret); |
|
| 987 |
} |
|
| 779 | 988 |
|
| 780 |
/* get current position, ftruncate do not change position */ |
|
| 781 |
li.HighPart = 0; |
|
| 782 |
li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT); |
|
| 783 |
if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR) |
|
| 784 |
return -1; |
|
| 989 |
static int bdrv_aio_new_em(BlockDriverAIOCB *acb) |
|
| 990 |
{
|
|
| 991 |
BlockDriverAIOCBSync *acb1; |
|
| 785 | 992 |
|
| 786 |
high = length >> 32; |
|
| 787 |
if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN)) |
|
| 788 |
return -1; |
|
| 789 |
res = SetEndOfFile(h); |
|
| 993 |
acb1 = qemu_mallocz(sizeof(BlockDriverAIOCBSync)); |
|
| 994 |
if (!acb1) |
|
| 995 |
return -1; |
|
| 996 |
acb->opaque = acb1; |
|
| 997 |
acb1->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
|
| 998 |
return 0; |
|
| 999 |
} |
|
| 790 | 1000 |
|
| 791 |
/* back to old position */ |
|
| 792 |
SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN); |
|
| 793 |
return res ? 0 : -1; |
|
| 1001 |
static int bdrv_aio_read_em(BlockDriverAIOCB *acb, int64_t sector_num, |
|
| 1002 |
uint8_t *buf, int nb_sectors) |
|
| 1003 |
{
|
|
| 1004 |
BlockDriverAIOCBSync *acb1 = acb->opaque; |
|
| 1005 |
int ret; |
|
| 1006 |
|
|
| 1007 |
ret = bdrv_read(acb->bs, sector_num, buf, nb_sectors); |
|
| 1008 |
acb1->ret = ret; |
|
| 1009 |
qemu_bh_schedule(acb1->bh); |
|
| 1010 |
return 0; |
|
| 794 | 1011 |
} |
| 795 | 1012 |
|
| 796 |
static int set_sparse(int fd) |
|
| 1013 |
static int bdrv_aio_write_em(BlockDriverAIOCB *acb, int64_t sector_num, |
|
| 1014 |
const uint8_t *buf, int nb_sectors) |
|
| 797 | 1015 |
{
|
| 798 |
DWORD returned; |
|
| 799 |
return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE, |
|
| 800 |
NULL, 0, NULL, 0, &returned, NULL); |
|
| 1016 |
BlockDriverAIOCBSync *acb1 = acb->opaque; |
|
| 1017 |
int ret; |
|
| 1018 |
|
|
| 1019 |
ret = bdrv_write(acb->bs, sector_num, buf, nb_sectors); |
|
| 1020 |
acb1->ret = ret; |
|
| 1021 |
qemu_bh_schedule(acb1->bh); |
|
| 1022 |
return 0; |
|
| 801 | 1023 |
} |
| 802 |
#else |
|
| 803 |
static inline int set_sparse(int fd)
|
|
| 1024 |
|
|
| 1025 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
|
|
| 804 | 1026 |
{
|
| 805 |
return 1; |
|
| 1027 |
BlockDriverAIOCBSync *acb1 = acb->opaque; |
|
| 1028 |
qemu_bh_cancel(acb1->bh); |
|
| 806 | 1029 |
} |
| 807 |
#endif |
|
| 808 | 1030 |
|
| 809 |
static int raw_create(const char *filename, int64_t total_size, |
|
| 810 |
const char *backing_file, int flags) |
|
| 1031 |
static void bdrv_aio_delete_em(BlockDriverAIOCB *acb) |
|
| 811 | 1032 |
{
|
| 812 |
int fd; |
|
| 1033 |
BlockDriverAIOCBSync *acb1 = acb->opaque; |
|
| 1034 |
qemu_bh_delete(acb1->bh); |
|
| 1035 |
} |
|
| 1036 |
#endif /* !QEMU_TOOL */ |
|
| 813 | 1037 |
|
| 814 |
if (flags || backing_file)
|
|
| 815 |
return -ENOTSUP;
|
|
| 1038 |
/**************************************************************/
|
|
| 1039 |
/* sync block device emulation */
|
|
| 816 | 1040 |
|
| 817 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
|
| 818 |
0644); |
|
| 819 |
if (fd < 0) |
|
| 820 |
return -EIO; |
|
| 821 |
set_sparse(fd); |
|
| 822 |
ftruncate(fd, total_size * 512); |
|
| 823 |
close(fd); |
|
| 824 |
return 0; |
|
| 1041 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
|
| 1042 |
{
|
|
| 1043 |
*(int *)opaque = ret; |
|
| 825 | 1044 |
} |
| 826 | 1045 |
|
| 827 |
static void raw_flush(BlockDriverState *bs) |
|
| 1046 |
#define NOT_DONE 0x7fffffff |
|
| 1047 |
|
|
| 1048 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
|
| 1049 |
uint8_t *buf, int nb_sectors) |
|
| 828 | 1050 |
{
|
| 829 |
BDRVRawState *s = bs->opaque; |
|
| 830 |
fsync(s->fd); |
|
| 1051 |
int async_ret, ret; |
|
| 1052 |
|
|
| 1053 |
if (!bs->sync_aiocb) {
|
|
| 1054 |
bs->sync_aiocb = bdrv_aio_new(bs); |
|
| 1055 |
if (!bs->sync_aiocb) |
|
| 1056 |
return -1; |
|
| 1057 |
} |
|
| 1058 |
async_ret = NOT_DONE; |
|
| 1059 |
qemu_aio_wait_start(); |
|
| 1060 |
ret = bdrv_aio_read(bs->sync_aiocb, sector_num, buf, nb_sectors, |
|
| 1061 |
bdrv_rw_em_cb, &async_ret); |
|
| 1062 |
if (ret < 0) {
|
|
| 1063 |
qemu_aio_wait_end(); |
|
| 1064 |
return ret; |
|
| 1065 |
} |
|
| 1066 |
while (async_ret == NOT_DONE) {
|
|
| 1067 |
qemu_aio_wait(); |
|
| 1068 |
} |
|
| 1069 |
qemu_aio_wait_end(); |
|
| 1070 |
return async_ret; |
|
| 831 | 1071 |
} |
| 832 | 1072 |
|
| 833 |
BlockDriver bdrv_raw = {
|
|
| 834 |
"raw", |
|
| 835 |
sizeof(BDRVRawState), |
|
| 836 |
raw_probe, |
|
| 837 |
raw_open, |
|
| 838 |
raw_read, |
|
| 839 |
raw_write, |
|
| 840 |
raw_close, |
|
| 841 |
raw_create, |
|
| 842 |
raw_flush, |
|
| 843 |
}; |
|
| 1073 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
|
| 1074 |
const uint8_t *buf, int nb_sectors) |
|
| 1075 |
{
|
|
| 1076 |
int async_ret, ret; |
|
| 1077 |
|
|
| 1078 |
if (!bs->sync_aiocb) {
|
|
| 1079 |
bs->sync_aiocb = bdrv_aio_new(bs); |
|
| 1080 |
if (!bs->sync_aiocb) |
|
| 1081 |
return -1; |
|
| 1082 |
} |
|
| 1083 |
async_ret = NOT_DONE; |
|
| 1084 |
qemu_aio_wait_start(); |
|
| 1085 |
ret = bdrv_aio_write(bs->sync_aiocb, sector_num, buf, nb_sectors, |
|
| 1086 |
bdrv_rw_em_cb, &async_ret); |
|
| 1087 |
if (ret < 0) {
|
|
| 1088 |
qemu_aio_wait_end(); |
|
| 1089 |
return ret; |
|
| 1090 |
} |
|
| 1091 |
while (async_ret == NOT_DONE) {
|
|
| 1092 |
qemu_aio_wait(); |
|
| 1093 |
} |
|
| 1094 |
qemu_aio_wait_end(); |
|
| 1095 |
return async_ret; |
|
| 1096 |
} |
|
| 844 | 1097 |
|
| 845 | 1098 |
void bdrv_init(void) |
| 846 | 1099 |
{
|
Also available in: Unified diff