}
}
-static int bdrv_rd_badreq_sectors(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors)
-{
- return
- nb_sectors < 0 ||
- sector_num < 0 ||
- nb_sectors > bs->total_sectors ||
- sector_num > bs->total_sectors - nb_sectors;
-}
-
-static int bdrv_rd_badreq_bytes(BlockDriverState *bs,
- int64_t offset, int count)
-{
- int64_t size = bs->total_sectors << SECTOR_BITS;
- return
- count < 0 ||
- size < 0 ||
- count > size ||
- offset > size - count;
-}
-
-static int bdrv_wr_badreq_sectors(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors)
-{
- if (sector_num < 0 ||
- nb_sectors < 0)
- return 1;
-
- if (sector_num > bs->total_sectors - nb_sectors) {
- if (bs->autogrow)
- bs->total_sectors = sector_num + nb_sectors;
- else
- return 1;
- }
- return 0;
-}
-
-static int bdrv_wr_badreq_bytes(BlockDriverState *bs,
- int64_t offset, int count)
-{
- int64_t size = bs->total_sectors << SECTOR_BITS;
- if (count < 0 ||
- offset < 0)
- return 1;
-
- if (offset > size - count) {
- if (bs->autogrow)
- bs->total_sectors = (offset + count + SECTOR_SIZE - 1) >> SECTOR_BITS;
- else
- return 1;
- }
- return 0;
-}
-
static void bdrv_register(BlockDriver *bdrv)
{
bs->read_only = 0;
bs->is_temporary = 0;
bs->encrypted = 0;
- bs->autogrow = 0;
-
- if (flags & BDRV_O_AUTOGROW)
- bs->autogrow = 1;
if (flags & BDRV_O_SNAPSHOT) {
BlockDriverState *bs1;
}
bs->drv = drv;
bs->opaque = qemu_mallocz(drv->instance_size);
- bs->total_sectors = 0; /* driver will set if it does not do getlength */
if (bs->opaque == NULL && drv->instance_size > 0)
return -1;
/* Note: for compatibility, we open disk image files as RDWR, and
bs->drv = NULL;
/* call the change callback */
- bs->total_sectors = 0;
bs->media_changed = 1;
if (bs->change_cb)
bs->change_cb(bs->change_opaque);
if (!drv)
return -ENOMEDIUM;
- if (bdrv_rd_badreq_sectors(bs, sector_num, nb_sectors))
- return -EDOM;
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
memcpy(buf, bs->boot_sector_data, 512);
sector_num++;
return -ENOMEDIUM;
if (bs->read_only)
return -EACCES;
- if (bdrv_wr_badreq_sectors(bs, sector_num, nb_sectors))
- return -EDOM;
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
memcpy(bs->boot_sector_data, buf, 512);
}
return -ENOMEDIUM;
if (!drv->bdrv_pread)
return bdrv_pread_em(bs, offset, buf1, count1);
- if (bdrv_rd_badreq_bytes(bs, offset, count1))
- return -EDOM;
return drv->bdrv_pread(bs, offset, buf1, count1);
}
return -ENOMEDIUM;
if (!drv->bdrv_pwrite)
return bdrv_pwrite_em(bs, offset, buf1, count1);
- if (bdrv_wr_badreq_bytes(bs, offset, count1))
- return -EDOM;
return drv->bdrv_pwrite(bs, offset, buf1, count1);
}
return -ENOMEDIUM;
if (!drv->bdrv_write_compressed)
return -ENOTSUP;
- if (bdrv_wr_badreq_sectors(bs, sector_num, nb_sectors))
- return -EDOM;
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
}
if (!drv)
return NULL;
- if (bdrv_rd_badreq_sectors(bs, sector_num, nb_sectors))
- return NULL;
/* XXX: we assume that nb_sectors == 0 is suppored by the async read */
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
return NULL;
if (bs->read_only)
return NULL;
- if (bdrv_wr_badreq_sectors(bs, sector_num, nb_sectors))
- return NULL;
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
memcpy(bs->boot_sector_data, buf, 512);
}