block: Switch BdrvTrackedRequest to byte granularity
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
diff --git a/block.c b/block.c
index 576859e..a32c81d 100644
--- a/block.c
+++ b/block.c
@@ -2217,13 +2217,13 @@
*/
static void tracked_request_begin(BdrvTrackedRequest *req,
BlockDriverState *bs,
- int64_t sector_num,
- int nb_sectors, bool is_write)
+ int64_t offset,
+ unsigned int bytes, bool is_write)
{
*req = (BdrvTrackedRequest){
.bs = bs,
- .sector_num = sector_num,
- .nb_sectors = nb_sectors,
+ .offset = offset,
+ .bytes = bytes,
.is_write = is_write,
.co = qemu_coroutine_self(),
};
@@ -2254,25 +2254,43 @@
}
}
+static void round_bytes_to_clusters(BlockDriverState *bs,
+ int64_t offset, unsigned int bytes,
+ int64_t *cluster_offset,
+ unsigned int *cluster_bytes)
+{
+ BlockDriverInfo bdi;
+
+ if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) {
+ *cluster_offset = offset;
+ *cluster_bytes = bytes;
+ } else {
+ *cluster_offset = QEMU_ALIGN_DOWN(offset, bdi.cluster_size);
+ *cluster_bytes = QEMU_ALIGN_UP(offset - *cluster_offset + bytes,
+ bdi.cluster_size);
+ }
+}
+
static bool tracked_request_overlaps(BdrvTrackedRequest *req,
- int64_t sector_num, int nb_sectors) {
+ int64_t offset, unsigned int bytes)
+{
/* aaaa bbbb */
- if (sector_num >= req->sector_num + req->nb_sectors) {
+ if (offset >= req->offset + req->bytes) {
return false;
}
/* bbbb aaaa */
- if (req->sector_num >= sector_num + nb_sectors) {
+ if (req->offset >= offset + bytes) {
return false;
}
return true;
}
static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors)
+ int64_t offset, unsigned int bytes)
{
BdrvTrackedRequest *req;
- int64_t cluster_sector_num;
- int cluster_nb_sectors;
+ int64_t cluster_offset;
+ unsigned int cluster_bytes;
bool retry;
/* If we touch the same cluster it counts as an overlap. This guarantees
@@ -2281,14 +2299,12 @@
* CoR read and write operations are atomic and guest writes cannot
* interleave between them.
*/
- bdrv_round_to_clusters(bs, sector_num, nb_sectors,
- &cluster_sector_num, &cluster_nb_sectors);
+ round_bytes_to_clusters(bs, offset, bytes, &cluster_offset, &cluster_bytes);
do {
retry = false;
QLIST_FOREACH(req, &bs->tracked_requests, list) {
- if (tracked_request_overlaps(req, cluster_sector_num,
- cluster_nb_sectors)) {
+ if (tracked_request_overlaps(req, cluster_offset, cluster_bytes)) {
/* Hitting this means there was a reentrant request, for
* example, a block driver issuing nested requests. This must
* never happen since it means deadlock.
@@ -2908,10 +2924,10 @@
}
if (bs->copy_on_read_in_flight) {
- wait_for_overlapping_requests(bs, sector_num, nb_sectors);
+ wait_for_overlapping_requests(bs, offset, bytes);
}
- tracked_request_begin(&req, bs, sector_num, nb_sectors, false);
+ tracked_request_begin(&req, bs, offset, bytes, false);
if (flags & BDRV_REQ_COPY_ON_READ) {
int pnum;
@@ -3160,10 +3176,10 @@
assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
if (bs->copy_on_read_in_flight) {
- wait_for_overlapping_requests(bs, sector_num, nb_sectors);
+ wait_for_overlapping_requests(bs, offset, bytes);
}
- tracked_request_begin(&req, bs, sector_num, nb_sectors, true);
+ tracked_request_begin(&req, bs, offset, bytes, true);
ret = notifier_with_return_list_notify(&bs->before_write_notifiers, &req);
