block: use int64_t instead of int in driver discard handlers

We are generally moving to int64_t for both offset and bytes parameters
on all io paths.

Main motivation is realization of 64-bit write_zeroes operation for
fast zeroing large disk chunks, up to the whole disk.

We chose signed type, to be consistent with off_t (which is signed) and
with possibility for signed return type (where negative value means
error).

So, convert driver discard handlers bytes parameter to int64_t.

The only caller of all updated function is bdrv_co_pdiscard in
block/io.c. It is already prepared to work with 64bit requests, but
pass at most max(bs->bl.max_pdiscard, INT_MAX) to the driver.

Let's look at all updated functions:

blkdebug: all calculations are still OK, thanks to
  bdrv_check_qiov_request().
  both rule_check and bdrv_co_pdiscard are 64bit

blklogwrites: pass to blk_loc_writes_co_log which is 64bit

blkreplay, copy-on-read, filter-compress: pass to bdrv_co_pdiscard, OK

copy-before-write: pass to bdrv_co_pdiscard which is 64bit and to
  cbw_do_copy_before_write which is 64bit

file-posix: one handler calls raw_account_discard() is 64bit and both
  handlers calls raw_do_pdiscard(). Update raw_do_pdiscard, which pass
  to RawPosixAIOData::aio_nbytes, which is 64bit (and calls
  raw_account_discard())

gluster: somehow, third argument of glfs_discard_async is size_t.
  Let's set max_pdiscard accordingly.

iscsi: iscsi_allocmap_set_invalid is 64bit,
  !is_byte_request_lun_aligned is 64bit.
  list.num is uint32_t. Let's clarify max_pdiscard and
  pdiscard_alignment.

mirror_top: pass to bdrv_mirror_top_do_write() which is
  64bit

nbd: protocol limitation. max_pdiscard is alredy set strict enough,
  keep it as is for now.

nvme: buf.nlb is uint32_t and we do shift. So, add corresponding limits
  to nvme_refresh_limits().

preallocate: pass to bdrv_co_pdiscard() which is 64bit.

rbd: pass to qemu_rbd_start_co() which is 64bit.

qcow2: calculations are still OK, thanks to bdrv_check_qiov_request(),
  qcow2_cluster_discard() is 64bit.

raw-format: raw_adjust_offset() is 64bit, bdrv_co_pdiscard too.

throttle: pass to bdrv_co_pdiscard() which is 64bit and to
  throttle_group_co_io_limits_intercept() which is 64bit as well.

test-block-iothread: bytes argument is unused

Great! Now all drivers are prepared to handle 64bit discard requests,
or else have explicit max_pdiscard limits.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210903102807.27127-11-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-09-03 13:28:06 +03:00 committed by Eric Blake
parent 39af49c0d7
commit 0c8022876f
20 changed files with 55 additions and 31 deletions

View file

@ -717,7 +717,7 @@ static int coroutine_fn blkdebug_co_pwrite_zeroes(BlockDriverState *bs,
}
static int coroutine_fn blkdebug_co_pdiscard(BlockDriverState *bs,
int64_t offset, int bytes)
int64_t offset, int64_t bytes)
{
uint32_t align = bs->bl.pdiscard_alignment;
int err;

View file

@ -484,9 +484,9 @@ static int coroutine_fn blk_log_writes_co_flush_to_disk(BlockDriverState *bs)
}
static int coroutine_fn
blk_log_writes_co_pdiscard(BlockDriverState *bs, int64_t offset, int count)
blk_log_writes_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes)
{
return blk_log_writes_co_log(bs, offset, count, NULL, 0,
return blk_log_writes_co_log(bs, offset, bytes, NULL, 0,
blk_log_writes_co_do_file_pdiscard,
LOG_DISCARD_FLAG, false);
}

View file

@ -105,7 +105,7 @@ static int coroutine_fn blkreplay_co_pwrite_zeroes(BlockDriverState *bs,
}
static int coroutine_fn blkreplay_co_pdiscard(BlockDriverState *bs,
int64_t offset, int bytes)
int64_t offset, int64_t bytes)
{
uint64_t reqid = blkreplay_next_id();
int ret = bdrv_co_pdiscard(bs->file, offset, bytes);

View file

@ -64,7 +64,7 @@ static coroutine_fn int cbw_do_copy_before_write(BlockDriverState *bs,
}
static int coroutine_fn cbw_co_pdiscard(BlockDriverState *bs,
int64_t offset, int bytes)
int64_t offset, int64_t bytes)
{
int ret = cbw_do_copy_before_write(bs, offset, bytes, 0);
if (ret < 0) {

View file

@ -201,7 +201,7 @@ static int coroutine_fn cor_co_pwrite_zeroes(BlockDriverState *bs,
static int coroutine_fn cor_co_pdiscard(BlockDriverState *bs,
int64_t offset, int bytes)
int64_t offset, int64_t bytes)
{
return bdrv_co_pdiscard(bs->file, offset, bytes);
}

View file

@ -2942,7 +2942,8 @@ static void raw_account_discard(BDRVRawState *s, uint64_t nbytes, int ret)
}
static coroutine_fn int
raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int bytes, bool blkdev)
raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes,
bool blkdev)
{
BDRVRawState *s = bs->opaque;
RawPosixAIOData acb;
@ -2966,7 +2967,7 @@ raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int bytes, bool blkdev)
}
static coroutine_fn int
raw_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
raw_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes)
{
return raw_do_pdiscard(bs, offset, bytes, false);
}
@ -3591,7 +3592,7 @@ hdev_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
#endif /* linux */
static coroutine_fn int
hdev_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
hdev_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes)
{
BDRVRawState *s = bs->opaque;
int ret;

View file

@ -94,7 +94,7 @@ static int coroutine_fn compress_co_pwrite_zeroes(BlockDriverState *bs,
static int coroutine_fn compress_co_pdiscard(BlockDriverState *bs,
int64_t offset, int bytes)
int64_t offset, int64_t bytes)
{
return bdrv_co_pdiscard(bs->file, offset, bytes);
}

View file

@ -891,6 +891,7 @@ out:
static void qemu_gluster_refresh_limits(BlockDriverState *bs, Error **errp)
{
bs->bl.max_transfer = GLUSTER_MAX_TRANSFER;
bs->bl.max_pdiscard = SIZE_MAX;
}
static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
@ -1297,18 +1298,20 @@ error:
#ifdef CONFIG_GLUSTERFS_DISCARD
static coroutine_fn int qemu_gluster_co_pdiscard(BlockDriverState *bs,
int64_t offset, int size)
int64_t offset, int64_t bytes)
{
int ret;
GlusterAIOCB acb;
BDRVGlusterState *s = bs->opaque;
assert(bytes <= SIZE_MAX); /* rely on max_pdiscard */
acb.size = 0;
acb.ret = 0;
acb.coroutine = qemu_coroutine_self();
acb.aio_context = bdrv_get_aio_context(bs);
ret = glfs_discard_async(s->fd, offset, size, gluster_finish_aiocb, &acb);
ret = glfs_discard_async(s->fd, offset, bytes, gluster_finish_aiocb, &acb);
if (ret < 0) {
return -errno;
}

View file

@ -1138,7 +1138,8 @@ iscsi_getlength(BlockDriverState *bs)
}
static int
coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset,
int64_t bytes)
{
IscsiLun *iscsilun = bs->opaque;
struct IscsiTask iTask;
@ -1154,6 +1155,12 @@ coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
return 0;
}
/*
* We don't want to overflow list.num which is uint32_t.
* We rely on our max_pdiscard.
*/
assert(bytes / iscsilun->block_size <= UINT32_MAX);
list.lba = offset / iscsilun->block_size;
list.num = bytes / iscsilun->block_size;
@ -2071,10 +2078,9 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
}
if (iscsilun->lbp.lbpu) {
if (iscsilun->bl.max_unmap < 0xffffffff / block_size) {
bs->bl.max_pdiscard =
iscsilun->bl.max_unmap * iscsilun->block_size;
}
bs->bl.max_pdiscard =
MIN_NON_ZERO(iscsilun->bl.max_unmap * iscsilun->block_size,
(uint64_t)UINT32_MAX * iscsilun->block_size);
bs->bl.pdiscard_alignment =
iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
} else {

View file

@ -1508,7 +1508,7 @@ static int coroutine_fn bdrv_mirror_top_pwrite_zeroes(BlockDriverState *bs,
}
static int coroutine_fn bdrv_mirror_top_pdiscard(BlockDriverState *bs,
int64_t offset, int bytes)
int64_t offset, int64_t bytes)
{
return bdrv_mirror_top_do_write(bs, MIRROR_METHOD_DISCARD, offset, bytes,
NULL, 0);

View file

@ -1457,15 +1457,17 @@ static int nbd_client_co_flush(BlockDriverState *bs)
}
static int nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset,
int bytes)
int64_t bytes)
{
BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
NBDRequest request = {
.type = NBD_CMD_TRIM,
.from = offset,
.len = bytes,
.len = bytes, /* len is uint32_t */
};
assert(bytes <= UINT32_MAX); /* rely on max_pdiscard */
assert(!(s->info.flags & NBD_FLAG_READ_ONLY));
if (!(s->info.flags & NBD_FLAG_SEND_TRIM) || !bytes) {
return 0;

View file

@ -1360,7 +1360,7 @@ static coroutine_fn int nvme_co_pwrite_zeroes(BlockDriverState *bs,
static int coroutine_fn nvme_co_pdiscard(BlockDriverState *bs,
int64_t offset,
int bytes)
int64_t bytes)
{
BDRVNVMeState *s = bs->opaque;
NVMeQueuePair *ioq = s->queues[INDEX_IO(0)];
@ -1387,6 +1387,14 @@ static int coroutine_fn nvme_co_pdiscard(BlockDriverState *bs,
assert(s->queue_count > 1);
/*
* Filling the @buf requires @offset and @bytes to satisfy restrictions
* defined in nvme_refresh_limits().
*/
assert(QEMU_IS_ALIGNED(bytes, 1UL << s->blkshift));
assert(QEMU_IS_ALIGNED(offset, 1UL << s->blkshift));
assert((bytes >> s->blkshift) <= UINT32_MAX);
buf = qemu_try_memalign(s->page_size, s->page_size);
if (!buf) {
return -ENOMEM;
@ -1490,6 +1498,10 @@ static void nvme_refresh_limits(BlockDriverState *bs, Error **errp)
bs->bl.max_pwrite_zeroes = 1ULL << (s->blkshift + 16);
bs->bl.pwrite_zeroes_alignment = MAX(bs->bl.request_alignment,
1UL << s->blkshift);
bs->bl.max_pdiscard = (uint64_t)UINT32_MAX << s->blkshift;
bs->bl.pdiscard_alignment = MAX(bs->bl.request_alignment,
1UL << s->blkshift);
}
static void nvme_detach_aio_context(BlockDriverState *bs)

View file

@ -235,7 +235,7 @@ static coroutine_fn int preallocate_co_preadv_part(
}
static int coroutine_fn preallocate_co_pdiscard(BlockDriverState *bs,
int64_t offset, int bytes)
int64_t offset, int64_t bytes)
{
return bdrv_co_pdiscard(bs->file, offset, bytes);
}

View file

@ -3996,7 +3996,7 @@ static coroutine_fn int qcow2_co_pwrite_zeroes(BlockDriverState *bs,
}
static coroutine_fn int qcow2_co_pdiscard(BlockDriverState *bs,
int64_t offset, int bytes)
int64_t offset, int64_t bytes)
{
int ret;
BDRVQcow2State *s = bs->opaque;

View file

@ -302,7 +302,7 @@ static int coroutine_fn raw_co_pwrite_zeroes(BlockDriverState *bs,
}
static int coroutine_fn raw_co_pdiscard(BlockDriverState *bs,
int64_t offset, int bytes)
int64_t offset, int64_t bytes)
{
int ret;

View file

@ -1197,9 +1197,9 @@ static int coroutine_fn qemu_rbd_co_flush(BlockDriverState *bs)
}
static int coroutine_fn qemu_rbd_co_pdiscard(BlockDriverState *bs,
int64_t offset, int count)
int64_t offset, int64_t bytes)
{
return qemu_rbd_start_co(bs, offset, count, NULL, 0, RBD_AIO_DISCARD);
return qemu_rbd_start_co(bs, offset, bytes, NULL, 0, RBD_AIO_DISCARD);
}
#ifdef LIBRBD_SUPPORTS_WRITE_ZEROES

View file

@ -145,7 +145,7 @@ static int coroutine_fn throttle_co_pwrite_zeroes(BlockDriverState *bs,
}
static int coroutine_fn throttle_co_pdiscard(BlockDriverState *bs,
int64_t offset, int bytes)
int64_t offset, int64_t bytes)
{
ThrottleGroupMember *tgm = bs->opaque;
throttle_group_co_io_limits_intercept(tgm, bytes, true);

View file

@ -152,8 +152,8 @@ nvme_write_zeroes(void *s, uint64_t offset, uint64_t bytes, int flags) "s %p off
nvme_qiov_unaligned(const void *qiov, int n, void *base, size_t size, int align) "qiov %p n %d base %p size 0x%zx align 0x%x"
nvme_prw_buffered(void *s, uint64_t offset, uint64_t bytes, int niov, int is_write) "s %p offset 0x%"PRIx64" bytes %"PRId64" niov %d is_write %d"
nvme_rw_done(void *s, int is_write, uint64_t offset, uint64_t bytes, int ret) "s %p is_write %d offset 0x%"PRIx64" bytes %"PRId64" ret %d"
nvme_dsm(void *s, uint64_t offset, uint64_t bytes) "s %p offset 0x%"PRIx64" bytes %"PRId64""
nvme_dsm_done(void *s, uint64_t offset, uint64_t bytes, int ret) "s %p offset 0x%"PRIx64" bytes %"PRId64" ret %d"
nvme_dsm(void *s, int64_t offset, int64_t bytes) "s %p offset 0x%"PRIx64" bytes %"PRId64""
nvme_dsm_done(void *s, int64_t offset, int64_t bytes, int ret) "s %p offset 0x%"PRIx64" bytes %"PRId64" ret %d"
nvme_dma_map_flush(void *s) "s %p"
nvme_free_req_queue_wait(void *s, unsigned q_index) "s %p q #%u"
nvme_create_queue_pair(unsigned q_index, void *q, size_t size, void *aio_context, int fd) "index %u q %p size %zu aioctx %p fd %d"

View file

@ -303,7 +303,7 @@ struct BlockDriver {
int coroutine_fn (*bdrv_co_pwrite_zeroes)(BlockDriverState *bs,
int64_t offset, int64_t bytes, BdrvRequestFlags flags);
int coroutine_fn (*bdrv_co_pdiscard)(BlockDriverState *bs,
int64_t offset, int bytes);
int64_t offset, int64_t bytes);
/* Map [offset, offset + nbytes) range onto a child of @bs to copy from,
* and invoke bdrv_co_copy_range_from(child, ...), or invoke

View file

@ -48,7 +48,7 @@ static int coroutine_fn bdrv_test_co_pwritev(BlockDriverState *bs,
}
static int coroutine_fn bdrv_test_co_pdiscard(BlockDriverState *bs,
int64_t offset, int bytes)
int64_t offset, int64_t bytes)
{
return 0;
}