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Diff for /qemu/block.c between versions 1.1.1.4 and 1.1.1.5

version 1.1.1.4, 2018/04/24 16:42:44 version 1.1.1.5, 2018/04/24 16:44:58
Line 32 Line 32
 #include <sys/disk.h>  #include <sys/disk.h>
 #endif  #endif
   
 #ifdef CONFIG_COCOA  #define SECTOR_BITS 9
 #include <paths.h>  #define SECTOR_SIZE (1 << SECTOR_BITS)
 #include <sys/param.h>  
 #include <IOKit/IOKitLib.h>  
 #include <IOKit/IOBSD.h>  
 #include <IOKit/storage/IOMediaBSDClient.h>  
 #include <IOKit/storage/IOMedia.h>  
 #include <IOKit/storage/IOCDMedia.h>  
 //#include <IOKit/storage/IOCDTypes.h>  
 #include <CoreFoundation/CoreFoundation.h>  
 #endif  
   
 #ifdef __sun__  typedef struct BlockDriverAIOCBSync {
 #include <sys/dkio.h>      BlockDriverAIOCB common;
 #endif      QEMUBH *bh;
       int ret;
   } BlockDriverAIOCBSync;
   
   static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
           int64_t sector_num, uint8_t *buf, int nb_sectors,
           BlockDriverCompletionFunc *cb, void *opaque);
   static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
           int64_t sector_num, const uint8_t *buf, int nb_sectors,
           BlockDriverCompletionFunc *cb, void *opaque);
   static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
   static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, 
                           uint8_t *buf, int nb_sectors);
   static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                            const uint8_t *buf, int nb_sectors);
   
 static BlockDriverState *bdrv_first;  static BlockDriverState *bdrv_first;
 static BlockDriver *first_drv;  static BlockDriver *first_drv;
   
 #ifdef CONFIG_COCOA  int path_is_absolute(const char *path)
 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );  {
 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );      const char *p;
   #ifdef _WIN32
 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )      /* specific case for names like: "\\.\d:" */
 {      if (*path == '/' || *path == '\\')
     kern_return_t       kernResult;           return 1;
     mach_port_t     masterPort;  #endif
     CFMutableDictionaryRef  classesToMatch;      p = strchr(path, ':');
       if (p)
     kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );          p++;
     if ( KERN_SUCCESS != kernResult ) {      else
         printf( "IOMasterPort returned %d\n", kernResult );          p = path;
     }  #ifdef _WIN32
           return (*p == '/' || *p == '\\');
     classesToMatch = IOServiceMatching( kIOCDMediaClass );   #else
     if ( classesToMatch == NULL ) {      return (*p == '/');
         printf( "IOServiceMatching returned a NULL dictionary.\n" );  #endif
     } else {  
     CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );  
     }  
     kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );  
     if ( KERN_SUCCESS != kernResult )  
     {  
         printf( "IOServiceGetMatchingServices returned %d\n", kernResult );  
     }  
       
     return kernResult;  
 }  }
   
 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )  /* if filename is absolute, just copy it to dest. Otherwise, build a
 {     path to it by considering it is relative to base_path. URL are
     io_object_t     nextMedia;     supported. */
     kern_return_t   kernResult = KERN_FAILURE;  void path_combine(char *dest, int dest_size,
     *bsdPath = '\0';                    const char *base_path,
     nextMedia = IOIteratorNext( mediaIterator );                    const char *filename)
     if ( nextMedia )  {
     {      const char *p, *p1;
         CFTypeRef   bsdPathAsCFString;      int len;
     bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );  
         if ( bsdPathAsCFString ) {      if (dest_size <= 0)
             size_t devPathLength;          return;
             strcpy( bsdPath, _PATH_DEV );      if (path_is_absolute(filename)) {
             strcat( bsdPath, "r" );          pstrcpy(dest, dest_size, filename);
             devPathLength = strlen( bsdPath );      } else {
             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {          p = strchr(base_path, ':');
                 kernResult = KERN_SUCCESS;          if (p)
             }              p++;
             CFRelease( bsdPathAsCFString );          else
               p = base_path;
           p1 = strrchr(base_path, '/');
   #ifdef _WIN32
           {
               const char *p2;
               p2 = strrchr(base_path, '\\');
               if (!p1 || p2 > p1)
                   p1 = p2;
         }          }
         IOObjectRelease( nextMedia );  #endif
           if (p1)
               p1++;
           else
               p1 = base_path;
           if (p1 > p)
               p = p1;
           len = p - base_path;
           if (len > dest_size - 1)
               len = dest_size - 1;
           memcpy(dest, base_path, len);
           dest[len] = '\0';
           pstrcat(dest, dest_size, filename);
     }      }
       
     return kernResult;  
 }  }
   
 #endif  
   
 void bdrv_register(BlockDriver *bdrv)  void bdrv_register(BlockDriver *bdrv)
 {  {
       if (!bdrv->bdrv_aio_read) {
           /* add AIO emulation layer */
           bdrv->bdrv_aio_read = bdrv_aio_read_em;
           bdrv->bdrv_aio_write = bdrv_aio_write_em;
           bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
           bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
       } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
           /* add synchronous IO emulation layer */
           bdrv->bdrv_read = bdrv_read_em;
           bdrv->bdrv_write = bdrv_write_em;
       }
     bdrv->next = first_drv;      bdrv->next = first_drv;
     first_drv = bdrv;      first_drv = bdrv;
 }  }
Line 156  int bdrv_create(BlockDriver *drv,  Line 179  int bdrv_create(BlockDriver *drv, 
 #ifdef _WIN32  #ifdef _WIN32
 void get_tmp_filename(char *filename, int size)  void get_tmp_filename(char *filename, int size)
 {  {
     char* p = strrchr(filename, '/');      char temp_dir[MAX_PATH];
       
     if (p == NULL)      GetTempPath(MAX_PATH, temp_dir);
         return;      GetTempFileName(temp_dir, "qem", 0, filename);
   
     /* XXX: find a better function */  
     tmpnam(p);  
     *p = '/';  
 }  }
 #else  #else
 void get_tmp_filename(char *filename, int size)  void get_tmp_filename(char *filename, int size)
Line 176  void get_tmp_filename(char *filename, in Line 195  void get_tmp_filename(char *filename, in
 }  }
 #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)
   {
       if (is_windows_drive_prefix(filename) && 
           filename[2] == '\0')
           return 1;
       if (strstart(filename, "\\\\.\\", NULL) ||
           strstart(filename, "//./", NULL))
           return 1;
       return 0;
   }
   #endif
   
   static BlockDriver *find_protocol(const char *filename)
   {
       BlockDriver *drv1;
       char protocol[128];
       int len;
       const char *p;
   
   #ifdef _WIN32
       if (is_windows_drive(filename) ||
           is_windows_drive_prefix(filename))
           return &bdrv_raw;
   #endif
       p = strchr(filename, ':');
       if (!p)
           return &bdrv_raw;
       len = p - filename;
       if (len > sizeof(protocol) - 1)
           len = sizeof(protocol) - 1;
       memcpy(protocol, filename, len);
       protocol[len] = '\0';
       for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
           if (drv1->protocol_name && 
               !strcmp(drv1->protocol_name, protocol))
               return drv1;
       }
       return NULL;
   }
   
 /* XXX: force raw format if block or character device ? It would  /* XXX: force raw format if block or character device ? It would
    simplify the BSD case */     simplify the BSD case */
 static BlockDriver *find_image_format(const char *filename)  static BlockDriver *find_image_format(const char *filename)
 {  {
     int fd, ret, score, score_max;      int ret, score, score_max;
     BlockDriver *drv1, *drv;      BlockDriver *drv1, *drv;
     uint8_t *buf;      uint8_t buf[2048];
     size_t bufsize = 1024;      BlockDriverState *bs;
       
     fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);      /* detect host devices. By convention, /dev/cdrom[N] is always
     if (fd < 0) {         recognized as a host CDROM */
         buf = NULL;      if (strstart(filename, "/dev/cdrom", NULL))
         ret = 0;          return &bdrv_host_device;
     } else {  #ifdef _WIN32
 #ifdef DIOCGSECTORSIZE      if (is_windows_drive(filename))
         {          return &bdrv_host_device;
             unsigned int sectorsize = 512;  #else
             if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&      {
                 sectorsize > bufsize)          struct stat st;
                 bufsize = sectorsize;          if (stat(filename, &st) >= 0 && 
         }              (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
 #endif              return &bdrv_host_device;
 #ifdef CONFIG_COCOA  
         u_int32_t   blockSize = 512;  
         if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {  
             bufsize = blockSize;  
         }  
 #endif  
         buf = qemu_malloc(bufsize);  
         if (!buf)  
             return NULL;  
         ret = read(fd, buf, bufsize);  
         if (ret < 0) {  
             close(fd);  
             qemu_free(buf);  
             return NULL;  
         }          }
         close(fd);  
     }      }
   #endif
           
     drv = NULL;      drv = find_protocol(filename);
       /* no need to test disk image formats for vvfat */
       if (drv == &bdrv_vvfat)
           return drv;
   
       ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
       if (ret < 0)
           return NULL;
       ret = bdrv_pread(bs, 0, buf, sizeof(buf));
       bdrv_delete(bs);
       if (ret < 0) {
           return NULL;
       }
   
     score_max = 0;      score_max = 0;
     for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {      for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
         score = drv1->bdrv_probe(buf, ret, filename);          if (drv1->bdrv_probe) {
         if (score > score_max) {              score = drv1->bdrv_probe(buf, ret, filename);
             score_max = score;              if (score > score_max) {
             drv = drv1;                  score_max = score;
                   drv = drv1;
               }
         }          }
     }      }
     qemu_free(buf);  
     return drv;      return drv;
 }  }
   
 int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot)  int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
 {  {
 #ifdef CONFIG_COCOA      BlockDriverState *bs;
     if ( strncmp( filename, "/dev/cdrom", 10 ) == 0 ) {      int ret;
         kern_return_t kernResult;  
         io_iterator_t mediaIterator;      bs = bdrv_new("");
         char bsdPath[ MAXPATHLEN ];      if (!bs)
         int fd;          return -ENOMEM;
        ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
         kernResult = FindEjectableCDMedia( &mediaIterator );      if (ret < 0) {
         kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );          bdrv_delete(bs);
               return ret;
         if ( bsdPath[ 0 ] != '\0' ) {  
             strcat(bsdPath,"s0");  
             /* some CDs don't have a partition 0 */  
             fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);  
             if (fd < 0) {  
                 bsdPath[strlen(bsdPath)-1] = '1';  
             } else {  
                 close(fd);  
             }  
             filename = bsdPath;  
         }  
           
         if ( mediaIterator )  
             IOObjectRelease( mediaIterator );  
     }      }
 #endif      *pbs = bs;
     return bdrv_open2(bs, filename, snapshot, NULL);      return 0;
   }
   
   int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
   {
       return bdrv_open2(bs, filename, flags, NULL);
 }  }
   
 int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,  int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
                BlockDriver *drv)                 BlockDriver *drv)
 {  {
     int ret;      int ret, open_flags;
     char tmp_filename[1024];      char tmp_filename[1024];
       char backing_filename[1024];
           
     bs->read_only = 0;      bs->read_only = 0;
     bs->is_temporary = 0;      bs->is_temporary = 0;
     bs->encrypted = 0;      bs->encrypted = 0;
   
     if (snapshot) {      if (flags & BDRV_O_SNAPSHOT) {
         BlockDriverState *bs1;          BlockDriverState *bs1;
         int64_t total_size;          int64_t total_size;
                   
Line 280  int bdrv_open2(BlockDriverState *bs, con Line 339  int bdrv_open2(BlockDriverState *bs, con
         /* if there is a backing file, use it */          /* if there is a backing file, use it */
         bs1 = bdrv_new("");          bs1 = bdrv_new("");
         if (!bs1) {          if (!bs1) {
             return -1;              return -ENOMEM;
         }          }
         if (bdrv_open(bs1, filename, 0) < 0) {          if (bdrv_open(bs1, filename, 0) < 0) {
             bdrv_delete(bs1);              bdrv_delete(bs1);
             return -1;              return -1;
         }          }
         total_size = bs1->total_sectors;          total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
         bdrv_delete(bs1);          bdrv_delete(bs1);
                   
         get_tmp_filename(tmp_filename, sizeof(tmp_filename));          get_tmp_filename(tmp_filename, sizeof(tmp_filename));
         /* XXX: use cow for linux as it is more efficient ? */          realpath(filename, backing_filename);
         if (bdrv_create(&bdrv_qcow, tmp_filename,           if (bdrv_create(&bdrv_qcow2, tmp_filename, 
                         total_size, filename, 0) < 0) {                          total_size, backing_filename, 0) < 0) {
             return -1;              return -1;
         }          }
         filename = tmp_filename;          filename = tmp_filename;
Line 300  int bdrv_open2(BlockDriverState *bs, con Line 359  int bdrv_open2(BlockDriverState *bs, con
     }      }
   
     pstrcpy(bs->filename, sizeof(bs->filename), filename);      pstrcpy(bs->filename, sizeof(bs->filename), filename);
     if (!drv) {      if (flags & BDRV_O_FILE) {
         drv = find_image_format(filename);          drv = find_protocol(filename);
         if (!drv)          if (!drv)
             return -1;              return -ENOENT;
       } else {
           if (!drv) {
               drv = find_image_format(filename);
               if (!drv)
                   return -1;
           }
     }      }
     bs->drv = drv;      bs->drv = drv;
     bs->opaque = qemu_mallocz(drv->instance_size);      bs->opaque = qemu_mallocz(drv->instance_size);
     if (bs->opaque == NULL && drv->instance_size > 0)      if (bs->opaque == NULL && drv->instance_size > 0)
         return -1;          return -1;
           /* Note: for compatibility, we open disk image files as RDWR, and
     ret = drv->bdrv_open(bs, filename);         RDONLY as fallback */
       if (!(flags & BDRV_O_FILE))
           open_flags = BDRV_O_RDWR;
       else
           open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
       ret = drv->bdrv_open(bs, filename, open_flags);
       if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
           ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
           bs->read_only = 1;
       }
     if (ret < 0) {      if (ret < 0) {
         qemu_free(bs->opaque);          qemu_free(bs->opaque);
         return -1;          bs->opaque = NULL;
           bs->drv = NULL;
           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' && drv->bdrv_is_allocated) {      if (bs->backing_file[0] != '\0') {
         /* if there is a backing file, use it */          /* if there is a backing file, use it */
         bs->backing_hd = bdrv_new("");          bs->backing_hd = bdrv_new("");
         if (!bs->backing_hd) {          if (!bs->backing_hd) {
         fail:          fail:
             bdrv_close(bs);              bdrv_close(bs);
             return -1;              return -ENOMEM;
         }          }
         if (bdrv_open(bs->backing_hd, bs->backing_file, 0) < 0)          path_combine(backing_filename, sizeof(backing_filename),
                        filename, bs->backing_file);
           if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0)
             goto fail;              goto fail;
     }      }
   
     bs->inserted = 1;  
   
     /* call the change callback */      /* call the change callback */
       bs->media_changed = 1;
     if (bs->change_cb)      if (bs->change_cb)
         bs->change_cb(bs->change_opaque);          bs->change_cb(bs->change_opaque);
   
Line 343  int bdrv_open2(BlockDriverState *bs, con Line 423  int bdrv_open2(BlockDriverState *bs, con
   
 void bdrv_close(BlockDriverState *bs)  void bdrv_close(BlockDriverState *bs)
 {  {
     if (bs->inserted) {      if (bs->drv) {
         if (bs->backing_hd)          if (bs->backing_hd)
             bdrv_delete(bs->backing_hd);              bdrv_delete(bs->backing_hd);
         bs->drv->bdrv_close(bs);          bs->drv->bdrv_close(bs);
Line 355  void bdrv_close(BlockDriverState *bs) Line 435  void bdrv_close(BlockDriverState *bs)
 #endif  #endif
         bs->opaque = NULL;          bs->opaque = NULL;
         bs->drv = NULL;          bs->drv = NULL;
         bs->inserted = 0;  
   
         /* call the change callback */          /* call the change callback */
           bs->media_changed = 1;
         if (bs->change_cb)          if (bs->change_cb)
             bs->change_cb(bs->change_opaque);              bs->change_cb(bs->change_opaque);
     }      }
Line 373  void bdrv_delete(BlockDriverState *bs) Line 453  void bdrv_delete(BlockDriverState *bs)
 /* commit COW file into the raw image */  /* commit COW file into the raw image */
 int bdrv_commit(BlockDriverState *bs)  int bdrv_commit(BlockDriverState *bs)
 {  {
     int64_t i;      BlockDriver *drv = bs->drv;
       int64_t i, total_sectors;
     int n, j;      int n, j;
     unsigned char sector[512];      unsigned char sector[512];
   
     if (!bs->inserted)      if (!drv)
         return -ENOENT;          return -ENOMEDIUM;
   
     if (bs->read_only) {      if (bs->read_only) {
         return -EACCES;          return -EACCES;
Line 388  int bdrv_commit(BlockDriverState *bs) Line 469  int bdrv_commit(BlockDriverState *bs)
         return -ENOTSUP;          return -ENOTSUP;
     }      }
   
     for (i = 0; i < bs->total_sectors;) {      total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
         if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) {      for (i = 0; i < total_sectors;) {
           if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
             for(j = 0; j < n; j++) {              for(j = 0; j < n; j++) {
                 if (bdrv_read(bs, i, sector, 1) != 0) {                  if (bdrv_read(bs, i, sector, 1) != 0) {
                     return -EIO;                      return -EIO;
Line 405  int bdrv_commit(BlockDriverState *bs) Line 487  int bdrv_commit(BlockDriverState *bs)
         }          }
     }      }
   
     if (bs->drv->bdrv_make_empty)      if (drv->bdrv_make_empty)
         return bs->drv->bdrv_make_empty(bs);          return drv->bdrv_make_empty(bs);
   
     return 0;      return 0;
 }  }
   
 /* return -1 if error */  /* return < 0 if error. See bdrv_write() for the return codes */
 int bdrv_read(BlockDriverState *bs, int64_t sector_num,   int bdrv_read(BlockDriverState *bs, int64_t sector_num, 
               uint8_t *buf, int nb_sectors)                uint8_t *buf, int nb_sectors)
 {  {
     int ret, n;  
     BlockDriver *drv = bs->drv;      BlockDriver *drv = bs->drv;
   
     if (!bs->inserted)      if (!drv)
         return -1;          return -ENOMEDIUM;
   
     while (nb_sectors > 0) {      if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
         if (sector_num == 0 && bs->boot_sector_enabled) {  
             memcpy(buf, bs->boot_sector_data, 512);              memcpy(buf, bs->boot_sector_data, 512);
             n = 1;          sector_num++;
         } else if (bs->backing_hd) {          nb_sectors--;
             if (drv->bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) {          buf += 512;
                 ret = drv->bdrv_read(bs, sector_num, buf, n);          if (nb_sectors == 0)
                 if (ret < 0)              return 0;
                     return -1;      }
             } else {      if (drv->bdrv_pread) {
                 /* read from the base image */          int ret, len;
                 ret = bdrv_read(bs->backing_hd, sector_num, buf, n);          len = nb_sectors * 512;
                 if (ret < 0)          ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
                     return -1;          if (ret < 0)
             }              return ret;
         } else {          else if (ret != len)
             ret = drv->bdrv_read(bs, sector_num, buf, nb_sectors);              return -EINVAL;
             if (ret < 0)          else
                 return -1;              return 0;
             /* no need to loop */      } else {
             break;          return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
         }  
         nb_sectors -= n;  
         sector_num += n;  
         buf += n * 512;  
     }      }
     return 0;  
 }  }
   
 /* return -1 if error */  /* 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,   int bdrv_write(BlockDriverState *bs, int64_t sector_num, 
                const uint8_t *buf, int nb_sectors)                 const uint8_t *buf, int nb_sectors)
 {  {
     if (!bs->inserted)      BlockDriver *drv = bs->drv;
         return -1;      if (!bs->drv)
           return -ENOMEDIUM;
     if (bs->read_only)      if (bs->read_only)
         return -1;          return -EACCES;
     if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {      if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
         memcpy(bs->boot_sector_data, buf, 512);             memcpy(bs->boot_sector_data, buf, 512);   
     }      }
     return bs->drv->bdrv_write(bs, sector_num, buf, nb_sectors);      if (drv->bdrv_pwrite) {
           int ret, len;
           len = nb_sectors * 512;
           ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
           if (ret < 0)
               return ret;
           else if (ret != len)
               return -EIO;
           else
               return 0;
       } else {
           return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
       }
 }  }
   
   static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, 
                            uint8_t *buf, int count1)
   {
       uint8_t tmp_buf[SECTOR_SIZE];
       int len, nb_sectors, count;
       int64_t sector_num;
   
       count = count1;
       /* first read to align to sector start */
       len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
       if (len > count)
           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" */
       nb_sectors = count >> SECTOR_BITS;
       if (nb_sectors > 0) {
           if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
               return -EIO;
           sector_num += nb_sectors;
           len = nb_sectors << SECTOR_BITS;
           buf += len;
           count -= len;
       }
   
       /* add data from the last sector */
       if (count > 0) {
           if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
               return -EIO;
           memcpy(buf, tmp_buf, count);
       }
       return count1;
   }
   
   static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, 
                             const uint8_t *buf, int count1)
   {
       uint8_t tmp_buf[SECTOR_SIZE];
       int len, nb_sectors, count;
       int64_t sector_num;
   
       count = count1;
       /* first write to align to sector start */
       len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
       if (len > count)
           len = count;
       sector_num = offset >> SECTOR_BITS;
       if (len > 0) {
           if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
               return -EIO;
           memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
           if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
               return -EIO;
           count -= len;
           if (count == 0)
               return count1;
           sector_num++;
           buf += len;
       }
   
       /* write the sectors "in place" */
       nb_sectors = count >> SECTOR_BITS;
       if (nb_sectors > 0) {
           if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
               return -EIO;
           sector_num += nb_sectors;
           len = nb_sectors << SECTOR_BITS;
           buf += len;
           count -= len;
       }
   
       /* add data from the last sector */
       if (count > 0) {
           if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
               return -EIO;
           memcpy(tmp_buf, buf, count);
           if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
               return -EIO;
       }
       return count1;
   }
   
   /**
    * Read with byte offsets (needed only for file protocols) 
    */
   int bdrv_pread(BlockDriverState *bs, int64_t offset, 
                  void *buf1, int count1)
   {
       BlockDriver *drv = bs->drv;
   
       if (!drv)
           return -ENOMEDIUM;
       if (!drv->bdrv_pread)
           return bdrv_pread_em(bs, offset, buf1, count1);
       return drv->bdrv_pread(bs, offset, buf1, count1);
   }
   
   /** 
    * Write with byte offsets (needed only for file protocols) 
    */
   int bdrv_pwrite(BlockDriverState *bs, int64_t offset, 
                   const void *buf1, int count1)
   {
       BlockDriver *drv = bs->drv;
   
       if (!drv)
           return -ENOMEDIUM;
       if (!drv->bdrv_pwrite)
           return bdrv_pwrite_em(bs, offset, buf1, count1);
       return drv->bdrv_pwrite(bs, offset, buf1, count1);
   }
   
   /**
    * 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.
    */
   int64_t bdrv_getlength(BlockDriverState *bs)
   {
       BlockDriver *drv = bs->drv;
       if (!drv)
           return -ENOMEDIUM;
       if (!drv->bdrv_getlength) {
           /* legacy mode */
           return bs->total_sectors * SECTOR_SIZE;
       }
       return drv->bdrv_getlength(bs);
   }
   
   /* return 0 as number of sectors if no device present or error */
 void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)  void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
 {  {
     *nb_sectors_ptr = bs->total_sectors;      int64_t length;
       length = bdrv_getlength(bs);
       if (length < 0)
           length = 0;
       else
           length = length >> SECTOR_BITS;
       *nb_sectors_ptr = length;
 }  }
   
 /* force a given boot sector. */  /* force a given boot sector. */
Line 527  int bdrv_is_read_only(BlockDriverState * Line 777  int bdrv_is_read_only(BlockDriverState *
     return bs->read_only;      return bs->read_only;
 }  }
   
 int bdrv_is_inserted(BlockDriverState *bs)  /* XXX: no longer used */
 {  
     return bs->inserted;  
 }  
   
 int bdrv_is_locked(BlockDriverState *bs)  
 {  
     return bs->locked;  
 }  
   
 void bdrv_set_locked(BlockDriverState *bs, int locked)  
 {  
     bs->locked = locked;  
 }  
   
 void bdrv_set_change_cb(BlockDriverState *bs,   void bdrv_set_change_cb(BlockDriverState *bs, 
                         void (*change_cb)(void *opaque), void *opaque)                          void (*change_cb)(void *opaque), void *opaque)
 {  {
Line 573  int bdrv_set_key(BlockDriverState *bs, c Line 809  int bdrv_set_key(BlockDriverState *bs, c
   
 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)  void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
 {  {
     if (!bs->inserted || !bs->drv) {      if (!bs->drv) {
         buf[0] = '\0';          buf[0] = '\0';
     } else {      } else {
         pstrcpy(buf, buf_size, bs->drv->format_name);          pstrcpy(buf, buf_size, bs->drv->format_name);
Line 645  void bdrv_info(void) Line 881  void bdrv_info(void)
         if (bs->removable) {          if (bs->removable) {
             term_printf(" locked=%d", bs->locked);              term_printf(" locked=%d", bs->locked);
         }          }
         if (bs->inserted) {          if (bs->drv) {
             term_printf(" file=%s", bs->filename);              term_printf(" file=");
             if (bs->backing_file[0] != '\0')              term_print_filename(bs->filename);
                 term_printf(" backing_file=%s", bs->backing_file);              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(" ro=%d", bs->read_only);
             term_printf(" drv=%s", bs->drv->format_name);              term_printf(" drv=%s", bs->drv->format_name);
             if (bs->encrypted)              if (bs->encrypted)
Line 660  void bdrv_info(void) Line 899  void bdrv_info(void)
     }      }
 }  }
   
   void bdrv_get_backing_filename(BlockDriverState *bs, 
                                  char *filename, int filename_size)
   {
       if (!bs->backing_hd) {
           pstrcpy(filename, filename_size, "");
       } else {
           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;
       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);
   }
   
 /**************************************************************/  /**************************************************************/
 /* RAW block driver */  /* handling of snapshots */
   
 typedef struct BDRVRawState {  int bdrv_snapshot_create(BlockDriverState *bs, 
     int fd;                           QEMUSnapshotInfo *sn_info)
 } BDRVRawState;  {
       BlockDriver *drv = bs->drv;
       if (!drv)
           return -ENOMEDIUM;
       if (!drv->bdrv_snapshot_create)
           return -ENOTSUP;
       return drv->bdrv_snapshot_create(bs, sn_info);
   }
   
 static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)  int bdrv_snapshot_goto(BlockDriverState *bs, 
                          const char *snapshot_id)
 {  {
     return 1; /* maybe */      BlockDriver *drv = bs->drv;
       if (!drv)
           return -ENOMEDIUM;
       if (!drv->bdrv_snapshot_goto)
           return -ENOTSUP;
       return drv->bdrv_snapshot_goto(bs, snapshot_id);
 }  }
   
 static int raw_open(BlockDriverState *bs, const char *filename)  int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
 {  {
     BDRVRawState *s = bs->opaque;      BlockDriver *drv = bs->drv;
     int fd;      if (!drv)
     int64_t size;          return -ENOMEDIUM;
 #ifdef _BSD      if (!drv->bdrv_snapshot_delete)
     struct stat sb;          return -ENOTSUP;
 #endif      return drv->bdrv_snapshot_delete(bs, snapshot_id);
 #ifdef __sun__  }
     struct dk_minfo minfo;  
     int rv;  
 #endif  
   
     fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);  int bdrv_snapshot_list(BlockDriverState *bs, 
     if (fd < 0) {                         QEMUSnapshotInfo **psn_info)
         fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);  {
         if (fd < 0)      BlockDriver *drv = bs->drv;
             return -1;      if (!drv)
         bs->read_only = 1;          return -ENOMEDIUM;
       if (!drv->bdrv_snapshot_list)
           return -ENOTSUP;
       return drv->bdrv_snapshot_list(bs, psn_info);
   }
   
   #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;
           }
     }      }
 #ifdef _BSD      return buf;
     if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {  }
 #ifdef DIOCGMEDIASIZE  
         if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))  char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
 #endif  {
 #ifdef CONFIG_COCOA      char buf1[128], date_buf[128], clock_buf[128];
         size = LONG_LONG_MAX;  #ifdef _WIN32
       struct tm *ptm;
 #else  #else
         size = lseek(fd, 0LL, SEEK_END);      struct tm tm;
 #endif  #endif
     } else      time_t ti;
 #endif      int64_t secs;
 #ifdef __sun__  
     /*      if (!sn) {
      * use the DKIOCGMEDIAINFO ioctl to read the size.          snprintf(buf, buf_size, 
      */                   "%-10s%-20s%7s%20s%15s", 
     rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );                   "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
     if ( rv != -1 ) {      } else {
         size = minfo.dki_lbsize * minfo.dki_capacity;          ti = sn->date_sec;
     } else /* there are reports that lseek on some devices  
               fails, but irc discussion said that contingency  
               on contingency was overkill */  
 #endif  
     {  
         size = lseek(fd, 0, SEEK_END);  
     }  
 #ifdef _WIN32  #ifdef _WIN32
     /* On Windows hosts it can happen that we're unable to get file size          ptm = localtime(&ti);
        for CD-ROM raw device (it's inherent limitation of the CDFS driver). */          strftime(date_buf, sizeof(date_buf),
     if (size == -1)                   "%Y-%m-%d %H:%M:%S", ptm);
         size = LONG_LONG_MAX;  #else
           localtime_r(&ti, &tm);
           strftime(date_buf, sizeof(date_buf),
                    "%Y-%m-%d %H:%M:%S", &tm);
 #endif  #endif
     bs->total_sectors = size / 512;          secs = sn->vm_clock_nsec / 1000000000;
     s->fd = fd;          snprintf(clock_buf, sizeof(clock_buf),
     return 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;
 }  }
   
 static int raw_read(BlockDriverState *bs, int64_t sector_num,   
                     uint8_t *buf, int nb_sectors)  
 {  
     BDRVRawState *s = bs->opaque;  
     int ret;  
       
     lseek(s->fd, sector_num * 512, SEEK_SET);  
     ret = read(s->fd, buf, nb_sectors * 512);  
     if (ret != nb_sectors * 512)   
         return -1;  
     return 0;  
 }  
   
 static int raw_write(BlockDriverState *bs, int64_t sector_num,   /**************************************************************/
                      const uint8_t *buf, int nb_sectors)  /* async I/Os */
   
   BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
                                   uint8_t *buf, int nb_sectors,
                                   BlockDriverCompletionFunc *cb, void *opaque)
 {  {
     BDRVRawState *s = bs->opaque;      BlockDriver *drv = bs->drv;
     int ret;  
       if (!drv)
           return NULL;
           
     lseek(s->fd, sector_num * 512, SEEK_SET);      /* XXX: we assume that nb_sectors == 0 is suppored by the async read */
     ret = write(s->fd, buf, nb_sectors * 512);      if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
     if (ret != nb_sectors * 512)           memcpy(buf, bs->boot_sector_data, 512);
         return -1;          sector_num++;
     return 0;          nb_sectors--;
           buf += 512;
       }
   
       return drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
 }  }
   
 static void raw_close(BlockDriverState *bs)  BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
                                    const uint8_t *buf, int nb_sectors,
                                    BlockDriverCompletionFunc *cb, void *opaque)
 {  {
     BDRVRawState *s = bs->opaque;      BlockDriver *drv = bs->drv;
     close(s->fd);  
 }  
   
 #ifdef _WIN32      if (!drv)
 #include <windows.h>          return NULL;
 #include <winioctl.h>      if (bs->read_only)
           return NULL;
       if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
           memcpy(bs->boot_sector_data, buf, 512);   
       }
   
 int qemu_ftruncate64(int fd, int64_t length)      return drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
   }
   
   void bdrv_aio_cancel(BlockDriverAIOCB *acb)
 {  {
     LARGE_INTEGER li;      BlockDriver *drv = acb->bs->drv;
     LONG high;  
     HANDLE h;  
     BOOL res;  
   
     if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)      drv->bdrv_aio_cancel(acb);
         return -1;  }
   
     h = (HANDLE)_get_osfhandle(fd);  
   
     /* get current position, ftruncate do not change position */  /**************************************************************/
     li.HighPart = 0;  /* async block device emulation */
     li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);  
     if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)  
         return -1;  
   
     high = length >> 32;  #ifdef QEMU_TOOL
     if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN))  static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
         return -1;          int64_t sector_num, uint8_t *buf, int nb_sectors,
     res = SetEndOfFile(h);          BlockDriverCompletionFunc *cb, void *opaque)
   {
       int ret;
       ret = bdrv_read(bs, sector_num, buf, nb_sectors);
       cb(opaque, ret);
       return NULL;
   }
   
     /* back to old position */  static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
     SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);          int64_t sector_num, const uint8_t *buf, int nb_sectors,
     return res ? 0 : -1;          BlockDriverCompletionFunc *cb, void *opaque)
   {
       int ret;
       ret = bdrv_write(bs, sector_num, buf, nb_sectors);
       cb(opaque, ret);
       return NULL;
 }  }
   
 static int set_sparse(int fd)  static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
 {  {
     DWORD returned;  
     return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,  
                                  NULL, 0, NULL, 0, &returned, NULL);  
 }  }
 #else  #else
 static inline int set_sparse(int fd)  static void bdrv_aio_bh_cb(void *opaque)
 {  {
     return 1;      BlockDriverAIOCBSync *acb = opaque;
       acb->common.cb(acb->common.opaque, acb->ret);
       qemu_aio_release(acb);
 }  }
 #endif  
   
 static int raw_create(const char *filename, int64_t total_size,  static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
                       const char *backing_file, int flags)          int64_t sector_num, uint8_t *buf, int nb_sectors,
           BlockDriverCompletionFunc *cb, void *opaque)
 {  {
     int fd;      BlockDriverAIOCBSync *acb;
       int ret;
   
     if (flags || backing_file)      acb = qemu_aio_get(bs, cb, opaque);
         return -ENOTSUP;      if (!acb->bh)
           acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
       ret = bdrv_read(bs, sector_num, buf, nb_sectors);
       acb->ret = ret;
       qemu_bh_schedule(acb->bh);
       return &acb->common;
   }
   
     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,   static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
               0644);          int64_t sector_num, const uint8_t *buf, int nb_sectors,
     if (fd < 0)          BlockDriverCompletionFunc *cb, void *opaque)
         return -EIO;  {
     set_sparse(fd);      BlockDriverAIOCBSync *acb;
     ftruncate(fd, total_size * 512);      int ret;
     close(fd);  
     return 0;      acb = qemu_aio_get(bs, cb, opaque);
       if (!acb->bh)
           acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
       ret = bdrv_write(bs, sector_num, buf, nb_sectors);
       acb->ret = ret;
       qemu_bh_schedule(acb->bh);
       return &acb->common;
   }
   
   static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
   {
       BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
       qemu_bh_cancel(acb->bh);
       qemu_aio_release(acb);
 }  }
   #endif /* !QEMU_TOOL */
   
 static void raw_flush(BlockDriverState *bs)  /**************************************************************/
   /* sync block device emulation */
   
   static void bdrv_rw_em_cb(void *opaque, int ret)
 {  {
     BDRVRawState *s = bs->opaque;      *(int *)opaque = ret;
     fsync(s->fd);  
 }  }
   
 BlockDriver bdrv_raw = {  #define NOT_DONE 0x7fffffff
     "raw",  
     sizeof(BDRVRawState),  static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, 
     raw_probe,                          uint8_t *buf, int nb_sectors)
     raw_open,  {
     raw_read,      int async_ret;
     raw_write,      BlockDriverAIOCB *acb;
     raw_close,  
     raw_create,      async_ret = NOT_DONE;
     raw_flush,      qemu_aio_wait_start();
 };      acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, 
                           bdrv_rw_em_cb, &async_ret);
       if (acb == NULL) {
           qemu_aio_wait_end();
           return -1;
       }
       while (async_ret == NOT_DONE) {
           qemu_aio_wait();
       }
       qemu_aio_wait_end();
       return async_ret;
   }
   
   static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                            const uint8_t *buf, int nb_sectors)
   {
       int async_ret;
       BlockDriverAIOCB *acb;
   
       async_ret = NOT_DONE;
       qemu_aio_wait_start();
       acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, 
                            bdrv_rw_em_cb, &async_ret);
       if (acb == NULL) {
           qemu_aio_wait_end();
           return -1;
       }
       while (async_ret == NOT_DONE) {
           qemu_aio_wait();
       }
       qemu_aio_wait_end();
       return async_ret;
   }
   
 void bdrv_init(void)  void bdrv_init(void)
 {  {
     bdrv_register(&bdrv_raw);      bdrv_register(&bdrv_raw);
       bdrv_register(&bdrv_host_device);
 #ifndef _WIN32  #ifndef _WIN32
     bdrv_register(&bdrv_cow);      bdrv_register(&bdrv_cow);
 #endif  #endif
Line 855  void bdrv_init(void) Line 1240  void bdrv_init(void)
     bdrv_register(&bdrv_bochs);      bdrv_register(&bdrv_bochs);
     bdrv_register(&bdrv_vpc);      bdrv_register(&bdrv_vpc);
     bdrv_register(&bdrv_vvfat);      bdrv_register(&bdrv_vvfat);
       bdrv_register(&bdrv_qcow2);
   }
   
   void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
                      void *opaque)
   {
       BlockDriver *drv;
       BlockDriverAIOCB *acb;
   
       drv = bs->drv;
       if (drv->free_aiocb) {
           acb = drv->free_aiocb;
           drv->free_aiocb = acb->next;
       } else {
           acb = qemu_mallocz(drv->aiocb_size);
           if (!acb)
               return NULL;
       }
       acb->bs = bs;
       acb->cb = cb;
       acb->opaque = opaque;
       return acb;
   }
   
   void qemu_aio_release(void *p)
   {
       BlockDriverAIOCB *acb = p;
       BlockDriver *drv = acb->bs->drv;
       acb->next = drv->free_aiocb;
       drv->free_aiocb = acb;
   }
   
   /**************************************************************/
   /* removable device support */
   
   /**
    * Return TRUE if the media is present
    */
   int bdrv_is_inserted(BlockDriverState *bs)
   {
       BlockDriver *drv = bs->drv;
       int ret;
       if (!drv)
           return 0;
       if (!drv->bdrv_is_inserted)
           return 1;
       ret = drv->bdrv_is_inserted(bs);
       return ret;
   }
   
   /**
    * Return TRUE if the media changed since the last call to this
    * function. It is currently only used for floppy disks 
    */
   int bdrv_media_changed(BlockDriverState *bs)
   {
       BlockDriver *drv = bs->drv;
       int ret;
   
       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;
   }
   
   /**
    * If eject_flag is TRUE, eject the media. Otherwise, close the tray
    */
   void bdrv_eject(BlockDriverState *bs, int eject_flag)
   {
       BlockDriver *drv = bs->drv;
       int ret;
   
       if (!drv || !drv->bdrv_eject) {
           ret = -ENOTSUP;
       } else {
           ret = drv->bdrv_eject(bs, eject_flag);
       }
       if (ret == -ENOTSUP) {
           if (eject_flag)
               bdrv_close(bs);
       }
   }
   
   int bdrv_is_locked(BlockDriverState *bs)
   {
       return bs->locked;
   }
   
   /**
    * Lock or unlock the media (if it is locked, the user won't be able
    * to eject it manually).
    */
   void bdrv_set_locked(BlockDriverState *bs, int locked)
   {
       BlockDriver *drv = bs->drv;
   
       bs->locked = locked;
       if (drv && drv->bdrv_set_locked) {
           drv->bdrv_set_locked(bs, locked);
       }
 }  }
Removed from v.1.1.1.4  
changed lines
  Added in v.1.1.1.5

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