diff options
Diffstat (limited to 'block.c')
-rw-r--r-- | block.c | 110 |
1 files changed, 0 insertions, 110 deletions
@@ -2322,116 +2322,6 @@ int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) return bs->drv->bdrv_check(bs, res, fix); } -#define COMMIT_BUF_SECTORS 2048 - -/* commit COW file into the raw image */ -int bdrv_commit(BlockDriverState *bs) -{ - BlockDriver *drv = bs->drv; - int64_t sector, total_sectors, length, backing_length; - int n, ro, open_flags; - int ret = 0; - uint8_t *buf = NULL; - - if (!drv) - return -ENOMEDIUM; - - if (!bs->backing) { - return -ENOTSUP; - } - - if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, NULL) || - bdrv_op_is_blocked(bs->backing->bs, BLOCK_OP_TYPE_COMMIT_TARGET, NULL)) { - return -EBUSY; - } - - ro = bs->backing->bs->read_only; - open_flags = bs->backing->bs->open_flags; - - if (ro) { - if (bdrv_reopen(bs->backing->bs, open_flags | BDRV_O_RDWR, NULL)) { - return -EACCES; - } - } - - length = bdrv_getlength(bs); - if (length < 0) { - ret = length; - goto ro_cleanup; - } - - backing_length = bdrv_getlength(bs->backing->bs); - if (backing_length < 0) { - ret = backing_length; - goto ro_cleanup; - } - - /* If our top snapshot is larger than the backing file image, - * grow the backing file image if possible. If not possible, - * we must return an error */ - if (length > backing_length) { - ret = bdrv_truncate(bs->backing->bs, length); - if (ret < 0) { - goto ro_cleanup; - } - } - - total_sectors = length >> BDRV_SECTOR_BITS; - - /* qemu_try_blockalign() for bs will choose an alignment that works for - * bs->backing->bs as well, so no need to compare the alignment manually. */ - buf = qemu_try_blockalign(bs, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); - if (buf == NULL) { - ret = -ENOMEM; - goto ro_cleanup; - } - - for (sector = 0; sector < total_sectors; sector += n) { - ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); - if (ret < 0) { - goto ro_cleanup; - } - if (ret) { - ret = bdrv_read(bs, sector, buf, n); - if (ret < 0) { - goto ro_cleanup; - } - - ret = bdrv_write(bs->backing->bs, sector, buf, n); - if (ret < 0) { - goto ro_cleanup; - } - } - } - - if (drv->bdrv_make_empty) { - ret = drv->bdrv_make_empty(bs); - if (ret < 0) { - goto ro_cleanup; - } - bdrv_flush(bs); - } - - /* - * Make sure all data we wrote to the backing device is actually - * stable on disk. - */ - if (bs->backing) { - bdrv_flush(bs->backing->bs); - } - - ret = 0; -ro_cleanup: - qemu_vfree(buf); - - if (ro) { - /* ignoring error return here */ - bdrv_reopen(bs->backing->bs, open_flags & ~BDRV_O_RDWR, NULL); - } - - return ret; -} - /* * Return values: * 0 - success |