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block: Move bdrv_commit() to block/commit.c

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No code changes, just moved from one file to another.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2016-05-30 15:53:15 +02:00
parent adad6496c5
commit 83fd6dd3e7
3 changed files with 112 additions and 112 deletions
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111
block/commit.c
View file

@ -282,3 +282,114 @@ void commit_start(BlockDriverState *bs, BlockDriverState *base,
trace_commit_start(bs, base, top, s, s->common.co, opaque);
qemu_coroutine_enter(s->common.co, s);
}
#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;
}