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Diff for /qemu/block.c between versions 1.1.1.13 and 1.1.1.15

version 1.1.1.13, 2018/04/24 17:20:50 version 1.1.1.15, 2018/04/24 17:57:40
Line 22 Line 22
  * THE SOFTWARE.   * THE SOFTWARE.
  */   */
 #include "config-host.h"  #include "config-host.h"
 #ifdef HOST_BSD  
 /* include native header before sys-queue.h */  
 #include <sys/queue.h>  
 #endif  
   
 #include "qemu-common.h"  #include "qemu-common.h"
 #include "monitor.h"  #include "monitor.h"
 #include "block_int.h"  #include "block_int.h"
 #include "module.h"  #include "module.h"
   #include "qemu-objects.h"
   
 #ifdef HOST_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__  #ifndef __DragonFly__
 #include <sys/disk.h>  #include <sys/disk.h>
 #endif  #endif
Line 45 Line 42
 #include <windows.h>  #include <windows.h>
 #endif  #endif
   
 #define SECTOR_BITS 9  
 #define SECTOR_SIZE (1 << SECTOR_BITS)  
   
 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,  static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,          int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque);          BlockDriverCompletionFunc *cb, void *opaque);
 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,  static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,          int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque);          BlockDriverCompletionFunc *cb, void *opaque);
   static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
           BlockDriverCompletionFunc *cb, void *opaque);
 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,  static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
                         uint8_t *buf, int nb_sectors);                          uint8_t *buf, int nb_sectors);
 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,  static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
Line 63  BlockDriverState *bdrv_first; Line 59  BlockDriverState *bdrv_first;
   
 static BlockDriver *first_drv;  static BlockDriver *first_drv;
   
   /* If non-zero, use only whitelisted block drivers */
   static int use_bdrv_whitelist;
   
 int path_is_absolute(const char *path)  int path_is_absolute(const char *path)
 {  {
     const char *p;      const char *p;
Line 138  void bdrv_register(BlockDriver *bdrv) Line 137  void bdrv_register(BlockDriver *bdrv)
         bdrv->bdrv_read = bdrv_read_em;          bdrv->bdrv_read = bdrv_read_em;
         bdrv->bdrv_write = bdrv_write_em;          bdrv->bdrv_write = bdrv_write_em;
     }      }
   
       if (!bdrv->bdrv_aio_flush)
           bdrv->bdrv_aio_flush = bdrv_aio_flush_em;
   
     bdrv->next = first_drv;      bdrv->next = first_drv;
     first_drv = bdrv;      first_drv = bdrv;
 }  }
Line 169  BlockDriver *bdrv_find_format(const char Line 172  BlockDriver *bdrv_find_format(const char
     return NULL;      return NULL;
 }  }
   
   static int bdrv_is_whitelisted(BlockDriver *drv)
   {
       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;
   }
   
 int bdrv_create(BlockDriver *drv, const char* filename,  int bdrv_create(BlockDriver *drv, const char* filename,
     QEMUOptionParameter *options)      QEMUOptionParameter *options)
 {  {
Line 329  int bdrv_open(BlockDriverState *bs, cons Line 356  int bdrv_open(BlockDriverState *bs, cons
 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,  int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
                BlockDriver *drv)                 BlockDriver *drv)
 {  {
     int ret, open_flags;      int ret, open_flags, try_rw;
     char tmp_filename[PATH_MAX];      char tmp_filename[PATH_MAX];
     char backing_filename[PATH_MAX];      char backing_filename[PATH_MAX];
   
     bs->read_only = 0;  
     bs->is_temporary = 0;      bs->is_temporary = 0;
     bs->encrypted = 0;      bs->encrypted = 0;
     bs->valid_key = 0;      bs->valid_key = 0;
Line 357  int bdrv_open2(BlockDriverState *bs, con Line 383  int bdrv_open2(BlockDriverState *bs, con
             bdrv_delete(bs1);              bdrv_delete(bs1);
             return ret;              return ret;
         }          }
         total_size = bdrv_getlength(bs1) >> SECTOR_BITS;          total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS;
   
         if (bs1->drv && bs1->drv->protocol_name)          if (bs1->drv && bs1->drv->protocol_name)
             is_protocol = 1;              is_protocol = 1;
Line 408  int bdrv_open2(BlockDriverState *bs, con Line 434  int bdrv_open2(BlockDriverState *bs, con
     }      }
     bs->drv = drv;      bs->drv = drv;
     bs->opaque = qemu_mallocz(drv->instance_size);      bs->opaque = qemu_mallocz(drv->instance_size);
   
       /*
        * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
        * write cache to the guest.  We do need the fdatasync to flush
        * out transactions for block allocations, and we maybe have a
        * volatile write cache in our backing device to deal with.
        */
       if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
           bs->enable_write_cache = 1;
   
     /* Note: for compatibility, we open disk image files as RDWR, and      /* Note: for compatibility, we open disk image files as RDWR, and
        RDONLY as fallback */         RDONLY as fallback */
       try_rw = !bs->read_only || bs->is_temporary;
     if (!(flags & BDRV_O_FILE))      if (!(flags & BDRV_O_FILE))
         open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK);          open_flags = (try_rw ? BDRV_O_RDWR : 0) |
               (flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO));
     else      else
         open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);          open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
     ret = drv->bdrv_open(bs, filename, open_flags);      if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv))
           ret = -ENOTSUP;
       else
           ret = drv->bdrv_open(bs, filename, open_flags);
     if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {      if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
         ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);          ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
         bs->read_only = 1;          bs->read_only = 1;
Line 429  int bdrv_open2(BlockDriverState *bs, con Line 470  int bdrv_open2(BlockDriverState *bs, con
         return ret;          return ret;
     }      }
     if (drv->bdrv_getlength) {      if (drv->bdrv_getlength) {
         bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;          bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
     }      }
 #ifndef _WIN32  #ifndef _WIN32
     if (bs->is_temporary) {      if (bs->is_temporary) {
Line 440  int bdrv_open2(BlockDriverState *bs, con Line 481  int bdrv_open2(BlockDriverState *bs, con
         /* if there is a backing file, use it */          /* if there is a backing file, use it */
         BlockDriver *back_drv = NULL;          BlockDriver *back_drv = NULL;
         bs->backing_hd = bdrv_new("");          bs->backing_hd = bdrv_new("");
           /* pass on read_only property to the backing_hd */
           bs->backing_hd->read_only = bs->read_only;
         path_combine(backing_filename, sizeof(backing_filename),          path_combine(backing_filename, sizeof(backing_filename),
                      filename, bs->backing_file);                       filename, bs->backing_file);
         if (bs->backing_format[0] != '\0')          if (bs->backing_format[0] != '\0')
Line 530  int bdrv_commit(BlockDriverState *bs) Line 573  int bdrv_commit(BlockDriverState *bs)
         return -ENOTSUP;          return -ENOTSUP;
     }      }
   
     total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;      total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
     for (i = 0; i < total_sectors;) {      for (i = 0; i < total_sectors;) {
         if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {          if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
             for(j = 0; j < n; j++) {              for(j = 0; j < n; j++) {
Line 596  int bdrv_read(BlockDriverState *bs, int6 Line 639  int bdrv_read(BlockDriverState *bs, int6
     return drv->bdrv_read(bs, sector_num, buf, nb_sectors);      return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
 }  }
   
   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 / (sizeof(unsigned long) * 8);
           bit = start % (sizeof(unsigned long) * 8);
           val = bs->dirty_bitmap[idx];
           if (dirty) {
               val |= 1 << bit;
           } else {
               val &= ~(1 << bit);
           }
           bs->dirty_bitmap[idx] = val;
       }
   }
   
 /* Return < 0 if error. Important errors are:  /* Return < 0 if error. Important errors are:
   -EIO         generic I/O error (may happen for all errors)    -EIO         generic I/O error (may happen for all errors)
   -ENOMEDIUM   No media inserted.    -ENOMEDIUM   No media inserted.
Line 613  int bdrv_write(BlockDriverState *bs, int Line 678  int bdrv_write(BlockDriverState *bs, int
     if (bdrv_check_request(bs, sector_num, nb_sectors))      if (bdrv_check_request(bs, sector_num, nb_sectors))
         return -EIO;          return -EIO;
   
       if (bs->dirty_bitmap) {
           set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
       }
   
     return drv->bdrv_write(bs, sector_num, buf, nb_sectors);      return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
 }  }
   
 int bdrv_pread(BlockDriverState *bs, int64_t offset,  int bdrv_pread(BlockDriverState *bs, int64_t offset,
                void *buf, int count1)                 void *buf, int count1)
 {  {
     uint8_t tmp_buf[SECTOR_SIZE];      uint8_t tmp_buf[BDRV_SECTOR_SIZE];
     int len, nb_sectors, count;      int len, nb_sectors, count;
     int64_t sector_num;      int64_t sector_num;
       int ret;
   
     count = count1;      count = count1;
     /* first read to align to sector start */      /* first read to align to sector start */
     len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);      len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
     if (len > count)      if (len > count)
         len = count;          len = count;
     sector_num = offset >> SECTOR_BITS;      sector_num = offset >> BDRV_SECTOR_BITS;
     if (len > 0) {      if (len > 0) {
         if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)          if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
             return -EIO;              return ret;
         memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);          memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
         count -= len;          count -= len;
         if (count == 0)          if (count == 0)
             return count1;              return count1;
Line 641  int bdrv_pread(BlockDriverState *bs, int Line 711  int bdrv_pread(BlockDriverState *bs, int
     }      }
   
     /* read the sectors "in place" */      /* read the sectors "in place" */
     nb_sectors = count >> SECTOR_BITS;      nb_sectors = count >> BDRV_SECTOR_BITS;
     if (nb_sectors > 0) {      if (nb_sectors > 0) {
         if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)          if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
             return -EIO;              return ret;
         sector_num += nb_sectors;          sector_num += nb_sectors;
         len = nb_sectors << SECTOR_BITS;          len = nb_sectors << BDRV_SECTOR_BITS;
         buf += len;          buf += len;
         count -= len;          count -= len;
     }      }
   
     /* add data from the last sector */      /* add data from the last sector */
     if (count > 0) {      if (count > 0) {
         if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)          if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
             return -EIO;              return ret;
         memcpy(buf, tmp_buf, count);          memcpy(buf, tmp_buf, count);
     }      }
     return count1;      return count1;
Line 663  int bdrv_pread(BlockDriverState *bs, int Line 733  int bdrv_pread(BlockDriverState *bs, int
 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,  int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
                 const void *buf, int count1)                  const void *buf, int count1)
 {  {
     uint8_t tmp_buf[SECTOR_SIZE];      uint8_t tmp_buf[BDRV_SECTOR_SIZE];
     int len, nb_sectors, count;      int len, nb_sectors, count;
     int64_t sector_num;      int64_t sector_num;
       int ret;
   
     count = count1;      count = count1;
     /* first write to align to sector start */      /* first write to align to sector start */
     len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);      len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
     if (len > count)      if (len > count)
         len = count;          len = count;
     sector_num = offset >> SECTOR_BITS;      sector_num = offset >> BDRV_SECTOR_BITS;
     if (len > 0) {      if (len > 0) {
         if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)          if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
             return -EIO;              return ret;
         memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);          memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
         if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)          if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
             return -EIO;              return ret;
         count -= len;          count -= len;
         if (count == 0)          if (count == 0)
             return count1;              return count1;
Line 687  int bdrv_pwrite(BlockDriverState *bs, in Line 758  int bdrv_pwrite(BlockDriverState *bs, in
     }      }
   
     /* 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;
 }  }
Line 718  int bdrv_truncate(BlockDriverState *bs,  Line 789  int bdrv_truncate(BlockDriverState *bs, 
         return -ENOMEDIUM;          return -ENOMEDIUM;
     if (!drv->bdrv_truncate)      if (!drv->bdrv_truncate)
         return -ENOTSUP;          return -ENOTSUP;
       if (bs->read_only)
           return -EACCES;
     return drv->bdrv_truncate(bs, offset);      return drv->bdrv_truncate(bs, offset);
 }  }
   
Line 731  int64_t bdrv_getlength(BlockDriverState  Line 804  int64_t bdrv_getlength(BlockDriverState 
         return -ENOMEDIUM;          return -ENOMEDIUM;
     if (!drv->bdrv_getlength) {      if (!drv->bdrv_getlength) {
         /* legacy mode */          /* legacy mode */
         return bs->total_sectors * SECTOR_SIZE;          return bs->total_sectors * BDRV_SECTOR_SIZE;
     }      }
     return drv->bdrv_getlength(bs);      return drv->bdrv_getlength(bs);
 }  }
Line 744  void bdrv_get_geometry(BlockDriverState  Line 817  void bdrv_get_geometry(BlockDriverState 
     if (length < 0)      if (length < 0)
         length = 0;          length = 0;
     else      else
         length = length >> SECTOR_BITS;          length = length >> BDRV_SECTOR_BITS;
     *nb_sectors_ptr = length;      *nb_sectors_ptr = length;
 }  }
   
Line 912  int bdrv_is_read_only(BlockDriverState * Line 985  int bdrv_is_read_only(BlockDriverState *
     return bs->read_only;      return bs->read_only;
 }  }
   
   int bdrv_set_read_only(BlockDriverState *bs, int read_only)
   {
       int ret = bs->read_only;
       bs->read_only = read_only;
       return ret;
   }
   
 int bdrv_is_sg(BlockDriverState *bs)  int bdrv_is_sg(BlockDriverState *bs)
 {  {
     return bs->sg;      return bs->sg;
 }  }
   
   int bdrv_enable_write_cache(BlockDriverState *bs)
   {
       return bs->enable_write_cache;
   }
   
 /* XXX: no longer used */  /* XXX: no longer used */
 void bdrv_set_change_cb(BlockDriverState *bs,  void bdrv_set_change_cb(BlockDriverState *bs,
                         void (*change_cb)(void *opaque), void *opaque)                          void (*change_cb)(void *opaque), void *opaque)
Line 1057  int bdrv_is_allocated(BlockDriverState * Line 1142  int bdrv_is_allocated(BlockDriverState *
     return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);      return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
 }  }
   
 void bdrv_info(Monitor *mon)  static void bdrv_print_dict(QObject *obj, void *opaque)
   {
       QDict *bs_dict;
       Monitor *mon = opaque;
   
       bs_dict = qobject_to_qdict(obj);
   
       monitor_printf(mon, "%s: type=%s removable=%d",
                           qdict_get_str(bs_dict, "device"),
                           qdict_get_str(bs_dict, "type"),
                           qdict_get_bool(bs_dict, "removable"));
   
       if (qdict_get_bool(bs_dict, "removable")) {
           monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
       }
   
       if (qdict_haskey(bs_dict, "inserted")) {
           QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
   
           monitor_printf(mon, " file=");
           monitor_print_filename(mon, qdict_get_str(qdict, "file"));
           if (qdict_haskey(qdict, "backing_file")) {
               monitor_printf(mon, " backing_file=");
               monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
           }
           monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
                               qdict_get_bool(qdict, "ro"),
                               qdict_get_str(qdict, "drv"),
                               qdict_get_bool(qdict, "encrypted"));
       } else {
           monitor_printf(mon, " [not inserted]");
       }
   
       monitor_printf(mon, "\n");
   }
   
   void bdrv_info_print(Monitor *mon, const QObject *data)
   {
       qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
   }
   
   /**
    * bdrv_info(): Block devices information
    *
    * Each block device information is stored in a QDict and the
    * returned QObject is a QList of all devices.
    *
    * The QDict contains the following:
    *
    * - "device": device name
    * - "type": device type
    * - "removable": true if the device is removable, false otherwise
    * - "locked": true if the device is locked, false otherwise
    * - "inserted": only present if the device is inserted, it is a QDict
    *    containing the following:
    *          - "file": device file name
    *          - "ro": true if read-only, false otherwise
    *          - "drv": driver format name
    *          - "backing_file": backing file name if one is used
    *          - "encrypted": true if encrypted, false otherwise
    *
    * Example:
    *
    * [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false,
    *     "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } },
    *   { "device": "floppy0", "type": "floppy", "removable": true,
    *     "locked": false } ]
    */
   void bdrv_info(Monitor *mon, QObject **ret_data)
 {  {
       QList *bs_list;
     BlockDriverState *bs;      BlockDriverState *bs;
   
       bs_list = qlist_new();
   
     for (bs = bdrv_first; bs != NULL; bs = bs->next) {      for (bs = bdrv_first; bs != NULL; bs = bs->next) {
         monitor_printf(mon, "%s:", bs->device_name);          QObject *bs_obj;
         monitor_printf(mon, " type=");          const char *type = "unknown";
   
         switch(bs->type) {          switch(bs->type) {
         case BDRV_TYPE_HD:          case BDRV_TYPE_HD:
             monitor_printf(mon, "hd");              type = "hd";
             break;              break;
         case BDRV_TYPE_CDROM:          case BDRV_TYPE_CDROM:
             monitor_printf(mon, "cdrom");              type = "cdrom";
             break;              break;
         case BDRV_TYPE_FLOPPY:          case BDRV_TYPE_FLOPPY:
             monitor_printf(mon, "floppy");              type = "floppy";
             break;              break;
         }          }
         monitor_printf(mon, " removable=%d", bs->removable);  
         if (bs->removable) {          bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
             monitor_printf(mon, " locked=%d", bs->locked);                                      "'removable': %i, 'locked': %i }",
         }                                      bs->device_name, type, bs->removable,
                                       bs->locked);
           assert(bs_obj != NULL);
   
         if (bs->drv) {          if (bs->drv) {
             monitor_printf(mon, " file=");              QObject *obj;
             monitor_print_filename(mon, bs->filename);              QDict *bs_dict = qobject_to_qdict(bs_obj);
   
               obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
                                        "'encrypted': %i }",
                                        bs->filename, bs->read_only,
                                        bs->drv->format_name,
                                        bdrv_is_encrypted(bs));
               assert(obj != NULL);
             if (bs->backing_file[0] != '\0') {              if (bs->backing_file[0] != '\0') {
                 monitor_printf(mon, " backing_file=");                  QDict *qdict = qobject_to_qdict(obj);
                 monitor_print_filename(mon, bs->backing_file);                  qdict_put(qdict, "backing_file",
                             qstring_from_str(bs->backing_file));
             }              }
             monitor_printf(mon, " ro=%d", bs->read_only);  
             monitor_printf(mon, " drv=%s", bs->drv->format_name);              qdict_put_obj(bs_dict, "inserted", obj);
             monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));  
         } else {  
             monitor_printf(mon, " [not inserted]");  
         }          }
         monitor_printf(mon, "\n");          qlist_append_obj(bs_list, bs_obj);
     }      }
   
       *ret_data = QOBJECT(bs_list);
 }  }
   
 /* The "info blockstats" command. */  static void bdrv_stats_iter(QObject *data, void *opaque)
 void bdrv_info_stats(Monitor *mon)  
 {  {
       QDict *qdict;
       Monitor *mon = opaque;
   
       qdict = qobject_to_qdict(data);
       monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
   
       qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
       monitor_printf(mon, " rd_bytes=%" PRId64
                           " wr_bytes=%" PRId64
                           " rd_operations=%" PRId64
                           " wr_operations=%" PRId64
                           "\n",
                           qdict_get_int(qdict, "rd_bytes"),
                           qdict_get_int(qdict, "wr_bytes"),
                           qdict_get_int(qdict, "rd_operations"),
                           qdict_get_int(qdict, "wr_operations"));
   }
   
   void bdrv_stats_print(Monitor *mon, const QObject *data)
   {
       qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
   }
   
   /**
    * bdrv_info_stats(): show block device statistics
    *
    * Each device statistic information is stored in a QDict and
    * the returned QObject is a QList of all devices.
    *
    * The QDict contains the following:
    *
    * - "device": device name
    * - "stats": A QDict with the statistics information, it contains:
    *     - "rd_bytes": bytes read
    *     - "wr_bytes": bytes written
    *     - "rd_operations": read operations
    *     - "wr_operations": write operations
    * 
    * Example:
    *
    * [ { "device": "ide0-hd0",
    *               "stats": { "rd_bytes": 512,
    *                          "wr_bytes": 0,
    *                          "rd_operations": 1,
    *                          "wr_operations": 0 } },
    *   { "device": "ide1-cd0",
    *               "stats": { "rd_bytes": 0,
    *                          "wr_bytes": 0,
    *                          "rd_operations": 0,
    *                          "wr_operations": 0 } } ]
    */
   void bdrv_info_stats(Monitor *mon, QObject **ret_data)
   {
       QObject *obj;
       QList *devices;
     BlockDriverState *bs;      BlockDriverState *bs;
   
       devices = qlist_new();
   
     for (bs = bdrv_first; bs != NULL; bs = bs->next) {      for (bs = bdrv_first; bs != NULL; bs = bs->next) {
         monitor_printf(mon, "%s:"          obj = qobject_from_jsonf("{ 'device': %s, 'stats': {"
                        " rd_bytes=%" PRIu64                                   "'rd_bytes': %" PRId64 ","
                        " wr_bytes=%" PRIu64                                   "'wr_bytes': %" PRId64 ","
                        " rd_operations=%" PRIu64                                   "'rd_operations': %" PRId64 ","
                        " wr_operations=%" PRIu64                                   "'wr_operations': %" PRId64
                        "\n",                                   "} }",
                        bs->device_name,                                   bs->device_name,
                        bs->rd_bytes, bs->wr_bytes,                                   bs->rd_bytes, bs->wr_bytes,
                        bs->rd_ops, bs->wr_ops);                                   bs->rd_ops, bs->wr_ops);
           assert(obj != NULL);
           qlist_append_obj(devices, obj);
     }      }
   
       *ret_data = QOBJECT(devices);
 }  }
   
 const char *bdrv_get_encrypted_filename(BlockDriverState *bs)  const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
Line 1144  int bdrv_write_compressed(BlockDriverSta Line 1371  int bdrv_write_compressed(BlockDriverSta
         return -ENOTSUP;          return -ENOTSUP;
     if (bdrv_check_request(bs, sector_num, nb_sectors))      if (bdrv_check_request(bs, sector_num, nb_sectors))
         return -EIO;          return -EIO;
   
       if (bs->dirty_bitmap) {
           set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
       }
   
     return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);      return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
 }  }
   
Line 1320  BlockDriverAIOCB *bdrv_aio_readv(BlockDr Line 1552  BlockDriverAIOCB *bdrv_aio_readv(BlockDr
   
     if (ret) {      if (ret) {
         /* Update stats even though technically transfer has not happened. */          /* Update stats even though technically transfer has not happened. */
         bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;          bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
         bs->rd_ops ++;          bs->rd_ops ++;
     }      }
   
Line 1341  BlockDriverAIOCB *bdrv_aio_writev(BlockD Line 1573  BlockDriverAIOCB *bdrv_aio_writev(BlockD
     if (bdrv_check_request(bs, sector_num, nb_sectors))      if (bdrv_check_request(bs, sector_num, nb_sectors))
         return NULL;          return NULL;
   
       if (bs->dirty_bitmap) {
           set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
       }
   
     ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,      ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
                                cb, opaque);                                 cb, opaque);
   
     if (ret) {      if (ret) {
         /* Update stats even though technically transfer has not happened. */          /* Update stats even though technically transfer has not happened. */
         bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;          bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
         bs->wr_ops ++;          bs->wr_ops ++;
     }      }
   
     return ret;      return ret;
 }  }
   
   
   typedef struct MultiwriteCB {
       int error;
       int num_requests;
       int num_callbacks;
       struct {
           BlockDriverCompletionFunc *cb;
           void *opaque;
           QEMUIOVector *free_qiov;
           void *free_buf;
       } callbacks[];
   } MultiwriteCB;
   
   static void multiwrite_user_cb(MultiwriteCB *mcb)
   {
       int i;
   
       for (i = 0; i < mcb->num_callbacks; i++) {
           mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
           qemu_free(mcb->callbacks[i].free_qiov);
           qemu_vfree(mcb->callbacks[i].free_buf);
       }
   }
   
   static void multiwrite_cb(void *opaque, int ret)
   {
       MultiwriteCB *mcb = opaque;
   
       if (ret < 0) {
           mcb->error = ret;
           multiwrite_user_cb(mcb);
       }
   
       mcb->num_requests--;
       if (mcb->num_requests == 0) {
           if (mcb->error == 0) {
               multiwrite_user_cb(mcb);
           }
           qemu_free(mcb);
       }
   }
   
   static int multiwrite_req_compare(const void *a, const void *b)
   {
       return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector);
   }
   
   /*
    * Takes a bunch of requests and tries to merge them. Returns the number of
    * requests that remain after merging.
    */
   static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
       int num_reqs, MultiwriteCB *mcb)
   {
       int i, outidx;
   
       // Sort requests by start sector
       qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
   
       // Check if adjacent requests touch the same clusters. If so, combine them,
       // filling up gaps with zero sectors.
       outidx = 0;
       for (i = 1; i < num_reqs; i++) {
           int merge = 0;
           int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
   
           // This handles the cases that are valid for all block drivers, namely
           // exactly sequential writes and overlapping writes.
           if (reqs[i].sector <= oldreq_last) {
               merge = 1;
           }
   
           // The block driver may decide that it makes sense to combine requests
           // even if there is a gap of some sectors between them. In this case,
           // the gap is filled with zeros (therefore only applicable for yet
           // unused space in format like qcow2).
           if (!merge && bs->drv->bdrv_merge_requests) {
               merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
           }
   
           if (merge) {
               size_t size;
               QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
               qemu_iovec_init(qiov,
                   reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
   
               // Add the first request to the merged one. If the requests are
               // overlapping, drop the last sectors of the first request.
               size = (reqs[i].sector - reqs[outidx].sector) << 9;
               qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
   
               // We might need to add some zeros between the two requests
               if (reqs[i].sector > oldreq_last) {
                   size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
                   uint8_t *buf = qemu_blockalign(bs, zero_bytes);
                   memset(buf, 0, zero_bytes);
                   qemu_iovec_add(qiov, buf, zero_bytes);
                   mcb->callbacks[i].free_buf = buf;
               }
   
               // Add the second request
               qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
   
               reqs[outidx].nb_sectors += reqs[i].nb_sectors;
               reqs[outidx].qiov = qiov;
   
               mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
           } else {
               outidx++;
               reqs[outidx].sector     = reqs[i].sector;
               reqs[outidx].nb_sectors = reqs[i].nb_sectors;
               reqs[outidx].qiov       = reqs[i].qiov;
           }
       }
   
       return outidx + 1;
   }
   
   /*
    * Submit multiple AIO write requests at once.
    *
    * On success, the function returns 0 and all requests in the reqs array have
    * been submitted. In error case this function returns -1, and any of the
    * requests may or may not be submitted yet. In particular, this means that the
    * callback will be called for some of the requests, for others it won't. The
    * caller must check the error field of the BlockRequest to wait for the right
    * callbacks (if error != 0, no callback will be called).
    *
    * The implementation may modify the contents of the reqs array, e.g. to merge
    * requests. However, the fields opaque and error are left unmodified as they
    * are used to signal failure for a single request to the caller.
    */
   int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
   {
       BlockDriverAIOCB *acb;
       MultiwriteCB *mcb;
       int i;
   
       if (num_reqs == 0) {
           return 0;
       }
   
       // Create MultiwriteCB structure
       mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
       mcb->num_requests = 0;
       mcb->num_callbacks = num_reqs;
   
       for (i = 0; i < num_reqs; i++) {
           mcb->callbacks[i].cb = reqs[i].cb;
           mcb->callbacks[i].opaque = reqs[i].opaque;
       }
   
       // Check for mergable requests
       num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
   
       // Run the aio requests
       for (i = 0; i < num_reqs; i++) {
           acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
               reqs[i].nb_sectors, multiwrite_cb, mcb);
   
           if (acb == NULL) {
               // We can only fail the whole thing if no request has been
               // submitted yet. Otherwise we'll wait for the submitted AIOs to
               // complete and report the error in the callback.
               if (mcb->num_requests == 0) {
                   reqs[i].error = EIO;
                   goto fail;
               } else {
                   mcb->error = EIO;
                   break;
               }
           } else {
               mcb->num_requests++;
           }
       }
   
       return 0;
   
   fail:
       free(mcb);
       return -1;
   }
   
   BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
           BlockDriverCompletionFunc *cb, void *opaque)
   {
       BlockDriver *drv = bs->drv;
   
       if (!drv)
           return NULL;
   
       /*
        * Note that unlike bdrv_flush the driver is reponsible for flushing a
        * backing image if it exists.
        */
       return drv->bdrv_aio_flush(bs, cb, opaque);
   }
   
 void bdrv_aio_cancel(BlockDriverAIOCB *acb)  void bdrv_aio_cancel(BlockDriverAIOCB *acb)
 {  {
     acb->pool->cancel(acb);      acb->pool->cancel(acb);
Line 1443  static BlockDriverAIOCB *bdrv_aio_writev Line 1877  static BlockDriverAIOCB *bdrv_aio_writev
     return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);      return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
 }  }
   
   static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
           BlockDriverCompletionFunc *cb, void *opaque)
   {
       BlockDriverAIOCBSync *acb;
   
       acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
       acb->is_write = 1; /* don't bounce in the completion hadler */
       acb->qiov = NULL;
       acb->bounce = NULL;
       acb->ret = 0;
   
       if (!acb->bh)
           acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
   
       bdrv_flush(bs);
       qemu_bh_schedule(acb->bh);
       return &acb->common;
   }
   
 /**************************************************************/  /**************************************************************/
 /* sync block device emulation */  /* sync block device emulation */
   
Line 1461  static int bdrv_read_em(BlockDriverState Line 1914  static int bdrv_read_em(BlockDriverState
     struct iovec iov;      struct iovec iov;
     QEMUIOVector qiov;      QEMUIOVector qiov;
   
       async_context_push();
   
     async_ret = NOT_DONE;      async_ret = NOT_DONE;
     iov.iov_base = (void *)buf;      iov.iov_base = (void *)buf;
     iov.iov_len = nb_sectors * 512;      iov.iov_len = nb_sectors * 512;
     qemu_iovec_init_external(&qiov, &iov, 1);      qemu_iovec_init_external(&qiov, &iov, 1);
     acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,      acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
         bdrv_rw_em_cb, &async_ret);          bdrv_rw_em_cb, &async_ret);
     if (acb == NULL)      if (acb == NULL) {
         return -1;          async_ret = -1;
           goto fail;
       }
   
     while (async_ret == NOT_DONE) {      while (async_ret == NOT_DONE) {
         qemu_aio_wait();          qemu_aio_wait();
     }      }
   
   
   fail:
       async_context_pop();
     return async_ret;      return async_ret;
 }  }
   
Line 1485  static int bdrv_write_em(BlockDriverStat Line 1945  static int bdrv_write_em(BlockDriverStat
     struct iovec iov;      struct iovec iov;
     QEMUIOVector qiov;      QEMUIOVector qiov;
   
       async_context_push();
   
     async_ret = NOT_DONE;      async_ret = NOT_DONE;
     iov.iov_base = (void *)buf;      iov.iov_base = (void *)buf;
     iov.iov_len = nb_sectors * 512;      iov.iov_len = nb_sectors * 512;
     qemu_iovec_init_external(&qiov, &iov, 1);      qemu_iovec_init_external(&qiov, &iov, 1);
     acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,      acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
         bdrv_rw_em_cb, &async_ret);          bdrv_rw_em_cb, &async_ret);
     if (acb == NULL)      if (acb == NULL) {
         return -1;          async_ret = -1;
           goto fail;
       }
     while (async_ret == NOT_DONE) {      while (async_ret == NOT_DONE) {
         qemu_aio_wait();          qemu_aio_wait();
     }      }
   
   fail:
       async_context_pop();
     return async_ret;      return async_ret;
 }  }
   
Line 1504  void bdrv_init(void) Line 1971  void bdrv_init(void)
     module_call_init(MODULE_INIT_BLOCK);      module_call_init(MODULE_INIT_BLOCK);
 }  }
   
   void bdrv_init_with_whitelist(void)
   {
       use_bdrv_whitelist = 1;
       bdrv_init();
   }
   
 void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,  void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
                    BlockDriverCompletionFunc *cb, void *opaque)                     BlockDriverCompletionFunc *cb, void *opaque)
 {  {
Line 1634  BlockDriverAIOCB *bdrv_aio_ioctl(BlockDr Line 2107  BlockDriverAIOCB *bdrv_aio_ioctl(BlockDr
     return NULL;      return NULL;
 }  }
   
   
   
 void *qemu_blockalign(BlockDriverState *bs, size_t size)  void *qemu_blockalign(BlockDriverState *bs, size_t size)
 {  {
     return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);      return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
 }  }
   
   void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
   {
       int64_t bitmap_size;
   
       if (enable) {
           if (!bs->dirty_bitmap) {
               bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
                       BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
               bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
   
               bs->dirty_bitmap = qemu_mallocz(bitmap_size);
           }
       } else {
           if (bs->dirty_bitmap) {
               qemu_free(bs->dirty_bitmap);
               bs->dirty_bitmap = NULL;
           }
       }
   }
   
   int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
   {
       int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
   
       if (bs->dirty_bitmap &&
           (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
           return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
               (1 << (chunk % (sizeof(unsigned long) * 8)));
       } else {
           return 0;
       }
   }
   
   void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
                         int nr_sectors)
   {
       set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
   }
Removed from v.1.1.1.13  
changed lines
  Added in v.1.1.1.15

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