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[PATCH v4 10/11] block: use int64_t instead of int in driver discard han
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From: |
Vladimir Sementsov-Ogievskiy |
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Subject: |
[PATCH v4 10/11] block: use int64_t instead of int in driver discard handlers |
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Date: |
Wed, 24 Mar 2021 23:51:31 +0300 |
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:
backup-top: pass to bdrv_co_pdiscard which is 64bit
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
blkreply, copy-on-read, filter-compress: pass to bdrv_co_pdiscard, OK
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, preallocate: 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.
nvmd: buf.nlb is uint32_t and we do shift. So, add corresponding limits
to nvme_refresh_limits().
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.
sheepdog: the format is deprecated. Don't care and just make old
INT_MAX limit to be explicit
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 64bit discard requests or has
explicit max_pdiscard limit.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
include/block/block_int.h | 2 +-
block/backup-top.c | 2 +-
block/blkdebug.c | 2 +-
block/blklogwrites.c | 4 ++--
block/blkreplay.c | 2 +-
block/copy-on-read.c | 2 +-
block/file-posix.c | 7 ++++---
block/filter-compress.c | 2 +-
block/gluster.c | 7 +++++--
block/iscsi.c | 10 +++++-----
block/mirror.c | 2 +-
block/nbd.c | 6 ++++--
block/nvme.c | 14 +++++++++++++-
block/preallocate.c | 2 +-
block/qcow2.c | 2 +-
block/raw-format.c | 2 +-
block/sheepdog.c | 15 ++++++++++++++-
block/throttle.c | 2 +-
tests/unit/test-block-iothread.c | 2 +-
block/trace-events | 4 ++--
20 files changed, 61 insertions(+), 30 deletions(-)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 0245620bf6..735935841e 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -302,7 +302,7 @@ 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
diff --git a/block/backup-top.c b/block/backup-top.c
index 838027981b..c5ce84def4 100644
--- a/block/backup-top.c
+++ b/block/backup-top.c
@@ -75,7 +75,7 @@ static coroutine_fn int backup_top_cbw(BlockDriverState *bs,
uint64_t offset,
}
static int coroutine_fn backup_top_co_pdiscard(BlockDriverState *bs,
- int64_t offset, int bytes)
+ int64_t offset, int64_t bytes)
{
int ret = backup_top_cbw(bs, offset, bytes, 0);
if (ret < 0) {
diff --git a/block/blkdebug.c b/block/blkdebug.c
index c81cb9cb1a..2d98a33982 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -700,7 +700,7 @@ 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;
diff --git a/block/blklogwrites.c b/block/blklogwrites.c
index d7ae64c22d..f7a251e91f 100644
--- a/block/blklogwrites.c
+++ b/block/blklogwrites.c
@@ -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);
}
diff --git a/block/blkreplay.c b/block/blkreplay.c
index 89d74a3cca..dcbe780ddb 100644
--- a/block/blkreplay.c
+++ b/block/blkreplay.c
@@ -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);
diff --git a/block/copy-on-read.c b/block/copy-on-read.c
index 758a5d44d5..c29cfdd10e 100644
--- a/block/copy-on-read.c
+++ b/block/copy-on-read.c
@@ -214,7 +214,7 @@ 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);
}
diff --git a/block/file-posix.c b/block/file-posix.c
index 03618cc18b..1ea2d0c889 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -2899,7 +2899,8 @@ 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;
@@ -2923,7 +2924,7 @@ 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);
}
@@ -3563,7 +3564,7 @@ static int fd_open(BlockDriverState *bs)
}
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;
diff --git a/block/filter-compress.c b/block/filter-compress.c
index fb85686b69..d5be538619 100644
--- a/block/filter-compress.c
+++ b/block/filter-compress.c
@@ -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);
}
diff --git a/block/gluster.c b/block/gluster.c
index 6a17b37c0c..066fdf60fa 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -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;
}
diff --git a/block/iscsi.c b/block/iscsi.c
index b90ed67377..297919ebc2 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1141,7 +1141,8 @@ 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;
@@ -2075,10 +2076,9 @@ 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 {
diff --git a/block/mirror.c b/block/mirror.c
index e40608b2d3..e2038a06d3 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1487,7 +1487,7 @@ 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);
diff --git a/block/nbd.c b/block/nbd.c
index 9ec822c083..cc522a765c 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -1669,15 +1669,17 @@ 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;
diff --git a/block/nvme.c b/block/nvme.c
index 1263022e1c..0c6c4031f3 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -1329,7 +1329,7 @@ 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)];
@@ -1356,6 +1356,14 @@ 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;
@@ -1459,6 +1467,10 @@ 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)
diff --git a/block/preallocate.c b/block/preallocate.c
index 99e28d9f08..1d4233f730 100644
--- a/block/preallocate.c
+++ b/block/preallocate.c
@@ -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);
}
diff --git a/block/qcow2.c b/block/qcow2.c
index c9bce9711d..955e488046 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3945,7 +3945,7 @@ 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;
diff --git a/block/raw-format.c b/block/raw-format.c
index 4e9304c63b..45846e42d5 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -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;
diff --git a/block/sheepdog.c b/block/sheepdog.c
index a45c73826d..80e04dccfd 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -3101,7 +3101,7 @@ static int sd_load_vmstate(BlockDriverState *bs,
QEMUIOVector *qiov,
static coroutine_fn int sd_co_pdiscard(BlockDriverState *bs, int64_t offset,
- int bytes)
+ int64_t bytes)
{
SheepdogAIOCB acb;
BDRVSheepdogState *s = bs->opaque;
@@ -3113,6 +3113,8 @@ static coroutine_fn int sd_co_pdiscard(BlockDriverState
*bs, int64_t offset,
return 0;
}
+ assert(bytes <= INT_MAX); /* thanks to max_pdiscard */
+
memset(&discard_iov, 0, sizeof(discard_iov));
memset(&iov, 0, sizeof(iov));
iov.iov_base = &zero;
@@ -3186,6 +3188,11 @@ static int64_t
sd_get_allocated_file_size(BlockDriverState *bs)
return size;
}
+static void sd_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+ bs->bl.max_pdiscard = INT_MAX;
+}
+
static QemuOptsList sd_create_opts = {
.name = "sheepdog-create-opts",
.head = QTAILQ_HEAD_INITIALIZER(sd_create_opts.head),
@@ -3269,6 +3276,8 @@ static BlockDriver bdrv_sheepdog = {
.create_opts = &sd_create_opts,
.strong_runtime_opts = sd_strong_runtime_opts,
+
+ .bdrv_refresh_limits = sd_refresh_limits,
};
static BlockDriver bdrv_sheepdog_tcp = {
@@ -3307,6 +3316,8 @@ static BlockDriver bdrv_sheepdog_tcp = {
.create_opts = &sd_create_opts,
.strong_runtime_opts = sd_strong_runtime_opts,
+
+ .bdrv_refresh_limits = sd_refresh_limits,
};
static BlockDriver bdrv_sheepdog_unix = {
@@ -3345,6 +3356,8 @@ static BlockDriver bdrv_sheepdog_unix = {
.create_opts = &sd_create_opts,
.strong_runtime_opts = sd_strong_runtime_opts,
+
+ .bdrv_refresh_limits = sd_refresh_limits,
};
static void bdrv_sheepdog_init(void)
diff --git a/block/throttle.c b/block/throttle.c
index c13fe9067f..6e8d52fa24 100644
--- a/block/throttle.c
+++ b/block/throttle.c
@@ -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);
diff --git a/tests/unit/test-block-iothread.c b/tests/unit/test-block-iothread.c
index 50b8718b2a..9656814814 100644
--- a/tests/unit/test-block-iothread.c
+++ b/tests/unit/test-block-iothread.c
@@ -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;
}
diff --git a/block/trace-events b/block/trace-events
index 3edd2899c2..3b86c03b2f 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -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, unsigned size, void
*aio_context, int fd) "index %u q %p size %u aioctx %p fd %d"
--
2.29.2
- [PATCH v4 00/11] 64bit block-layer: part II, Vladimir Sementsov-Ogievskiy, 2021/03/24
- [PATCH v4 02/11] qcow2: check request on vmstate save/load path, Vladimir Sementsov-Ogievskiy, 2021/03/24
- [PATCH v4 01/11] block/io: bring request check to bdrv_co_{read, write}v_vmstate, Vladimir Sementsov-Ogievskiy, 2021/03/24
- [PATCH v4 07/11] block: use int64_t instead of int in driver write_zeroes handlers, Vladimir Sementsov-Ogievskiy, 2021/03/24
- [PATCH v4 04/11] block: use int64_t instead of uint64_t in driver write handlers, Vladimir Sementsov-Ogievskiy, 2021/03/24
- [PATCH v4 08/11] block/io: allow 64bit write-zeroes requests, Vladimir Sementsov-Ogievskiy, 2021/03/24
- [PATCH v4 03/11] block: use int64_t instead of uint64_t in driver read handlers, Vladimir Sementsov-Ogievskiy, 2021/03/24
- [PATCH v4 05/11] block: use int64_t instead of uint64_t in copy_range driver handlers, Vladimir Sementsov-Ogievskiy, 2021/03/24
- [PATCH v4 09/11] block: make BlockLimits::max_pdiscard 64bit, Vladimir Sementsov-Ogievskiy, 2021/03/24
- [PATCH v4 06/11] block: make BlockLimits::max_pwrite_zeroes 64bit, Vladimir Sementsov-Ogievskiy, 2021/03/24
- [PATCH v4 10/11] block: use int64_t instead of int in driver discard handlers,
Vladimir Sementsov-Ogievskiy <=
- [PATCH v4 11/11] block/io: allow 64bit discard requests, Vladimir Sementsov-Ogievskiy, 2021/03/24
- Re: [PATCH v4 00/11] 64bit block-layer: part II, no-reply, 2021/03/24