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authorKevin Wolf <kwolf@redhat.com>2016-04-14 13:09:53 +0200
committerKevin Wolf <kwolf@redhat.com>2016-05-25 19:04:21 +0200
commit4653456a5f60cbedaa0d4638252967e2248c570b (patch)
tree9abec72a350def3a7dad760e5c020db3ffe1568c /block/commit.c
parent5c438bc68c5dd9671c234eb86ebf026b016b6e35 (diff)
downloadqemu-4653456a5f60cbedaa0d4638252967e2248c570b.zip
qemu-4653456a5f60cbedaa0d4638252967e2248c570b.tar.gz
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commit: Use BlockBackend for I/O
This changes the commit block job to use the job's BlockBackend for performing its I/O. job->bs isn't used by the commit code any more afterwards. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'block/commit.c')
-rw-r--r--block/commit.c53
1 files changed, 33 insertions, 20 deletions
diff --git a/block/commit.c b/block/commit.c
index f308c8c..8a00e11 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -36,28 +36,36 @@ typedef struct CommitBlockJob {
BlockJob common;
RateLimit limit;
BlockDriverState *active;
- BlockDriverState *top;
- BlockDriverState *base;
+ BlockBackend *top;
+ BlockBackend *base;
BlockdevOnError on_error;
int base_flags;
int orig_overlay_flags;
char *backing_file_str;
} CommitBlockJob;
-static int coroutine_fn commit_populate(BlockDriverState *bs,
- BlockDriverState *base,
+static int coroutine_fn commit_populate(BlockBackend *bs, BlockBackend *base,
int64_t sector_num, int nb_sectors,
void *buf)
{
int ret = 0;
+ QEMUIOVector qiov;
+ struct iovec iov = {
+ .iov_base = buf,
+ .iov_len = nb_sectors * BDRV_SECTOR_SIZE,
+ };
- ret = bdrv_read(bs, sector_num, buf, nb_sectors);
- if (ret) {
+ qemu_iovec_init_external(&qiov, &iov, 1);
+
+ ret = blk_co_preadv(bs, sector_num * BDRV_SECTOR_SIZE,
+ qiov.size, &qiov, 0);
+ if (ret < 0) {
return ret;
}
- ret = bdrv_write(base, sector_num, buf, nb_sectors);
- if (ret) {
+ ret = blk_co_pwritev(base, sector_num * BDRV_SECTOR_SIZE,
+ qiov.size, &qiov, 0);
+ if (ret < 0) {
return ret;
}
@@ -73,8 +81,8 @@ static void commit_complete(BlockJob *job, void *opaque)
CommitBlockJob *s = container_of(job, CommitBlockJob, common);
CommitCompleteData *data = opaque;
BlockDriverState *active = s->active;
- BlockDriverState *top = s->top;
- BlockDriverState *base = s->base;
+ BlockDriverState *top = blk_bs(s->top);
+ BlockDriverState *base = blk_bs(s->base);
BlockDriverState *overlay_bs;
int ret = data->ret;
@@ -94,6 +102,8 @@ static void commit_complete(BlockJob *job, void *opaque)
bdrv_reopen(overlay_bs, s->orig_overlay_flags, NULL);
}
g_free(s->backing_file_str);
+ blk_unref(s->top);
+ blk_unref(s->base);
block_job_completed(&s->common, ret);
g_free(data);
}
@@ -102,8 +112,6 @@ static void coroutine_fn commit_run(void *opaque)
{
CommitBlockJob *s = opaque;
CommitCompleteData *data;
- BlockDriverState *top = s->top;
- BlockDriverState *base = s->base;
int64_t sector_num, end;
int ret = 0;
int n = 0;
@@ -111,27 +119,27 @@ static void coroutine_fn commit_run(void *opaque)
int bytes_written = 0;
int64_t base_len;
- ret = s->common.len = bdrv_getlength(top);
+ ret = s->common.len = blk_getlength(s->top);
if (s->common.len < 0) {
goto out;
}
- ret = base_len = bdrv_getlength(base);
+ ret = base_len = blk_getlength(s->base);
if (base_len < 0) {
goto out;
}
if (base_len < s->common.len) {
- ret = bdrv_truncate(base, s->common.len);
+ ret = blk_truncate(s->base, s->common.len);
if (ret) {
goto out;
}
}
end = s->common.len >> BDRV_SECTOR_BITS;
- buf = qemu_blockalign(top, COMMIT_BUFFER_SIZE);
+ buf = blk_blockalign(s->top, COMMIT_BUFFER_SIZE);
for (sector_num = 0; sector_num < end; sector_num += n) {
uint64_t delay_ns = 0;
@@ -146,7 +154,8 @@ wait:
break;
}
/* Copy if allocated above the base */
- ret = bdrv_is_allocated_above(top, base, sector_num,
+ ret = bdrv_is_allocated_above(blk_bs(s->top), blk_bs(s->base),
+ sector_num,
COMMIT_BUFFER_SIZE / BDRV_SECTOR_SIZE,
&n);
copy = (ret == 1);
@@ -158,7 +167,7 @@ wait:
goto wait;
}
}
- ret = commit_populate(top, base, sector_num, n, buf);
+ ret = commit_populate(s->top, s->base, sector_num, n, buf);
bytes_written += n * BDRV_SECTOR_SIZE;
}
if (ret < 0) {
@@ -253,8 +262,12 @@ void commit_start(BlockDriverState *bs, BlockDriverState *base,
return;
}
- s->base = base;
- s->top = top;
+ s->base = blk_new();
+ blk_insert_bs(s->base, base);
+
+ s->top = blk_new();
+ blk_insert_bs(s->top, top);
+
s->active = bs;
s->base_flags = orig_base_flags;