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-rw-r--r--block.c110
1 files changed, 0 insertions, 110 deletions
diff --git a/block.c b/block.c
index 947df293d2..7603a0b5db 100644
--- a/block.c
+++ b/block.c
@@ -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