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block: Allow waiting for overlapping requests between begin/end 

Previously, it was not possible to use wait_for_overlapping_requests()
between tracked_request_begin()/end() because it would wait for itself.

Ignore the current request in the overlap check and run more of the
bdrv_co_do_preadv/pwritev code with a BdrvTrackedRequest present.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
This commit is contained in:
Kevin Wolf 2013-12-03 14:55:55 +01:00
parent 793ed47a7a
commit 65afd211c7
1 changed files with 20 additions and 18 deletions
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38
block.c
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@ -2286,7 +2286,7 @@ static bool tracked_request_overlaps(BdrvTrackedRequest *req,
}
static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs,
int64_t offset, unsigned int bytes)
BdrvTrackedRequest *self, int64_t offset, unsigned int bytes)
{
BdrvTrackedRequest *req;
int64_t cluster_offset;
@ -2304,6 +2304,9 @@ static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs,
do {
retry = false;
QLIST_FOREACH(req, &bs->tracked_requests, list) {
if (req == self) {
continue;
}
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
@ -2906,10 +2909,10 @@ err:
* implemented by the caller.
*/
static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs,
int64_t offset, unsigned int bytes, QEMUIOVector *qiov, int flags)
BdrvTrackedRequest *req, int64_t offset, unsigned int bytes,
QEMUIOVector *qiov, int flags)
{
BlockDriver *drv = bs->drv;
BdrvTrackedRequest req;
int ret;
int64_t sector_num = offset >> BDRV_SECTOR_BITS;
@ -2924,11 +2927,9 @@ static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs,
}
if (bs->copy_on_read_in_flight) {
wait_for_overlapping_requests(bs, offset, bytes);
wait_for_overlapping_requests(bs, req, offset, bytes);
}
tracked_request_begin(&req, bs, offset, bytes, false);
if (flags & BDRV_REQ_COPY_ON_READ) {
int pnum;
@ -2975,8 +2976,6 @@ static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs,
}
out:
tracked_request_end(&req);
if (flags & BDRV_REQ_COPY_ON_READ) {
bs->copy_on_read_in_flight--;
}
@ -2992,6 +2991,8 @@ static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs,
BdrvRequestFlags flags)
{
BlockDriver *drv = bs->drv;
BdrvTrackedRequest req;
/* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */
uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment);
uint8_t *head_buf = NULL;
@ -3042,9 +3043,11 @@ static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs,
bytes = ROUND_UP(bytes, align);
}
ret = bdrv_aligned_preadv(bs, offset, bytes,
tracked_request_begin(&req, bs, offset, bytes, false);
ret = bdrv_aligned_preadv(bs, &req, offset, bytes,
use_local_qiov ? &local_qiov : qiov,
flags);
tracked_request_end(&req);
if (use_local_qiov) {
qemu_iovec_destroy(&local_qiov);
@ -3163,10 +3166,10 @@ static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs,
* Forwards an already correctly aligned write request to the BlockDriver.
*/
static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
int64_t offset, unsigned int bytes, QEMUIOVector *qiov, int flags)
BdrvTrackedRequest *req, int64_t offset, unsigned int bytes,
QEMUIOVector *qiov, int flags)
{
BlockDriver *drv = bs->drv;
BdrvTrackedRequest req;
int ret;
int64_t sector_num = offset >> BDRV_SECTOR_BITS;
@ -3176,12 +3179,10 @@ static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
if (bs->copy_on_read_in_flight) {
wait_for_overlapping_requests(bs, offset, bytes);
wait_for_overlapping_requests(bs, req, offset, bytes);
}
tracked_request_begin(&req, bs, offset, bytes, true);
ret = notifier_with_return_list_notify(&bs->before_write_notifiers, &req);
ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req);
if (ret < 0) {
/* Do nothing, write notifier decided to fail this request */
@ -3204,8 +3205,6 @@ static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors);
}
tracked_request_end(&req);
return ret;
}
@ -3216,6 +3215,7 @@ static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs,
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
BdrvRequestFlags flags)
{
BdrvTrackedRequest req;
int ret;
if (!bs->drv) {
@ -3234,7 +3234,9 @@ static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs,
bdrv_io_limits_intercept(bs, bytes >> BDRV_SECTOR_BITS, true);
}
ret = bdrv_aligned_pwritev(bs, offset, bytes, qiov, flags);
tracked_request_begin(&req, bs, offset, bytes, true);
ret = bdrv_aligned_pwritev(bs, &req, offset, bytes, qiov, flags);
tracked_request_end(&req);
return ret;
}