diff options
Diffstat (limited to 'block/io.c')
| -rw-r--r-- | block/io.c | 43 |
1 files changed, 7 insertions, 36 deletions
@@ -837,42 +837,6 @@ static int bdrv_prwv_co(BdrvChild *child, int64_t offset, return rwco.ret; } -/* - * Process a synchronous request using coroutines - */ -static int bdrv_rw_co(BdrvChild *child, int64_t sector_num, uint8_t *buf, - int nb_sectors, bool is_write, BdrvRequestFlags flags) -{ - QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, - nb_sectors * BDRV_SECTOR_SIZE); - - if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { - return -EINVAL; - } - - return bdrv_prwv_co(child, sector_num << BDRV_SECTOR_BITS, - &qiov, is_write, flags); -} - -/* return < 0 if error. See bdrv_write() for the return codes */ -int bdrv_read(BdrvChild *child, int64_t sector_num, - uint8_t *buf, int nb_sectors) -{ - return bdrv_rw_co(child, sector_num, buf, nb_sectors, false, 0); -} - -/* 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(BdrvChild *child, int64_t sector_num, - const uint8_t *buf, int nb_sectors) -{ - return bdrv_rw_co(child, sector_num, (uint8_t *)buf, nb_sectors, true, 0); -} - int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset, int bytes, BdrvRequestFlags flags) { @@ -935,6 +899,7 @@ int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov) return qiov->size; } +/* See bdrv_pwrite() for the return codes */ int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes) { QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); @@ -958,6 +923,12 @@ int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov) return qiov->size; } +/* Return no. of bytes on success or < 0 on error. Important errors are: + -EIO generic I/O error (may happen for all errors) + -ENOMEDIUM No media inserted. + -EINVAL Invalid offset or number of bytes + -EACCES Trying to write a read-only device +*/ int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes) { QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); |