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-rw-r--r--block/block-backend.c10
-rw-r--r--block/io.c23
-rw-r--r--block/iscsi.c23
-rw-r--r--block/nbd.c2
-rw-r--r--block/raw-posix.c4
-rw-r--r--hw/block/virtio-blk.c9
-rw-r--r--hw/scsi/scsi-generic.c12
-rw-r--r--include/block/block_int.h13
-rw-r--r--include/sysemu/block-backend.h2
-rw-r--r--qemu-img.c8
10 files changed, 58 insertions, 48 deletions
diff --git a/block/block-backend.c b/block/block-backend.c
index 1fb070b..e042544 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1303,16 +1303,16 @@ int blk_get_flags(BlockBackend *blk)
}
}
-/* Returns the maximum transfer length, in sectors; guaranteed nonzero */
-int blk_get_max_transfer_length(BlockBackend *blk)
+/* Returns the maximum transfer length, in bytes; guaranteed nonzero */
+uint32_t blk_get_max_transfer(BlockBackend *blk)
{
BlockDriverState *bs = blk_bs(blk);
- int max = 0;
+ uint32_t max = 0;
if (bs) {
- max = bs->bl.max_transfer_length;
+ max = bs->bl.max_transfer;
}
- return MIN_NON_ZERO(max, BDRV_REQUEST_MAX_SECTORS);
+ return MIN_NON_ZERO(max, INT_MAX);
}
int blk_get_max_iov(BlockBackend *blk)
diff --git a/block/io.c b/block/io.c
index 323e822..8ca9d43 100644
--- a/block/io.c
+++ b/block/io.c
@@ -88,8 +88,8 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
error_propagate(errp, local_err);
return;
}
- bs->bl.opt_transfer_length = bs->file->bs->bl.opt_transfer_length;
- bs->bl.max_transfer_length = bs->file->bs->bl.max_transfer_length;
+ bs->bl.opt_transfer = bs->file->bs->bl.opt_transfer;
+ bs->bl.max_transfer = bs->file->bs->bl.max_transfer;
bs->bl.min_mem_alignment = bs->file->bs->bl.min_mem_alignment;
bs->bl.opt_mem_alignment = bs->file->bs->bl.opt_mem_alignment;
bs->bl.max_iov = bs->file->bs->bl.max_iov;
@@ -107,12 +107,10 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
error_propagate(errp, local_err);
return;
}
- bs->bl.opt_transfer_length =
- MAX(bs->bl.opt_transfer_length,
- bs->backing->bs->bl.opt_transfer_length);
- bs->bl.max_transfer_length =
- MIN_NON_ZERO(bs->bl.max_transfer_length,
- bs->backing->bs->bl.max_transfer_length);
+ bs->bl.opt_transfer = MAX(bs->bl.opt_transfer,
+ bs->backing->bs->bl.opt_transfer);
+ bs->bl.max_transfer = MIN_NON_ZERO(bs->bl.max_transfer,
+ bs->backing->bs->bl.max_transfer);
bs->bl.opt_mem_alignment =
MAX(bs->bl.opt_mem_alignment,
bs->backing->bs->bl.opt_mem_alignment);
@@ -1156,7 +1154,8 @@ int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0);
}
-#define MAX_WRITE_ZEROES_BOUNCE_BUFFER 32768
+/* Maximum buffer for write zeroes fallback, in bytes */
+#define MAX_WRITE_ZEROES_BOUNCE_BUFFER (32768 << BDRV_SECTOR_BITS)
static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
int64_t offset, int count, BdrvRequestFlags flags)
@@ -1214,7 +1213,7 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
if (ret == -ENOTSUP) {
/* Fall back to bounce buffer if write zeroes is unsupported */
- int max_xfer_len = MIN_NON_ZERO(bs->bl.max_transfer_length,
+ int max_transfer = MIN_NON_ZERO(bs->bl.max_transfer,
MAX_WRITE_ZEROES_BOUNCE_BUFFER);
BdrvRequestFlags write_flags = flags & ~BDRV_REQ_ZERO_WRITE;
@@ -1225,7 +1224,7 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
write_flags &= ~BDRV_REQ_FUA;
need_flush = true;
}
- num = MIN(num, max_xfer_len << BDRV_SECTOR_BITS);
+ num = MIN(num, max_transfer);
iov.iov_len = num;
if (iov.iov_base == NULL) {
iov.iov_base = qemu_try_blockalign(bs, num);
@@ -1242,7 +1241,7 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
/* Keep bounce buffer around if it is big enough for all
* all future requests.
*/
- if (num < max_xfer_len << BDRV_SECTOR_BITS) {
+ if (num < max_transfer) {
qemu_vfree(iov.iov_base);
iov.iov_base = NULL;
}
diff --git a/block/iscsi.c b/block/iscsi.c
index 721afb7..bde4a04 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -473,9 +473,10 @@ iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
return -EINVAL;
}
- if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) {
+ if (bs->bl.max_transfer &&
+ nb_sectors << BDRV_SECTOR_BITS > bs->bl.max_transfer) {
error_report("iSCSI Error: Write of %d sectors exceeds max_xfer_len "
- "of %d sectors", nb_sectors, bs->bl.max_transfer_length);
+ "of %" PRIu32 " bytes", nb_sectors, bs->bl.max_transfer);
return -EINVAL;
}
@@ -650,9 +651,10 @@ static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
return -EINVAL;
}
- if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) {
+ if (bs->bl.max_transfer &&
+ nb_sectors << BDRV_SECTOR_BITS > bs->bl.max_transfer) {
error_report("iSCSI Error: Read of %d sectors exceeds max_xfer_len "
- "of %d sectors", nb_sectors, bs->bl.max_transfer_length);
+ "of %" PRIu32 " bytes", nb_sectors, bs->bl.max_transfer);
return -EINVAL;
}
@@ -1708,7 +1710,7 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
* iscsi_open(): iscsi targets don't change their limits. */
IscsiLun *iscsilun = bs->opaque;
- uint32_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
+ uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
bs->request_alignment = iscsilun->block_size;
@@ -1716,7 +1718,9 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
}
- bs->bl.max_transfer_length = sector_limits_lun2qemu(max_xfer_len, iscsilun);
+ if (max_xfer_len * iscsilun->block_size < INT_MAX) {
+ bs->bl.max_transfer = max_xfer_len * iscsilun->block_size;
+ }
if (iscsilun->lbp.lbpu) {
if (iscsilun->bl.max_unmap < 0xffffffff) {
@@ -1739,8 +1743,11 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
} else {
bs->bl.pwrite_zeroes_alignment = iscsilun->block_size;
}
- bs->bl.opt_transfer_length =
- sector_limits_lun2qemu(iscsilun->bl.opt_xfer_len, iscsilun);
+ if (iscsilun->bl.opt_xfer_len &&
+ iscsilun->bl.opt_xfer_len < INT_MAX / iscsilun->block_size) {
+ bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
+ iscsilun->block_size);
+ }
}
/* Note that this will not re-establish a connection with an iSCSI target - it
diff --git a/block/nbd.c b/block/nbd.c
index bf67c8a..f5511ea 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -363,7 +363,7 @@ static int nbd_co_flush(BlockDriverState *bs)
static void nbd_refresh_limits(BlockDriverState *bs, Error **errp)
{
bs->bl.max_discard = NBD_MAX_SECTORS;
- bs->bl.max_transfer_length = NBD_MAX_SECTORS;
+ bs->bl.max_transfer = NBD_MAX_BUFFER_SIZE;
}
static int nbd_co_discard(BlockDriverState *bs, int64_t sector_num,
diff --git a/block/raw-posix.c b/block/raw-posix.c
index bef7a67..8da2f94 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -745,8 +745,8 @@ static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
if (!fstat(s->fd, &st)) {
if (S_ISBLK(st.st_mode)) {
int ret = hdev_get_max_transfer_length(s->fd);
- if (ret >= 0) {
- bs->bl.max_transfer_length = ret;
+ if (ret > 0 && ret <= BDRV_REQUEST_MAX_SECTORS) {
+ bs->bl.max_transfer = pow2floor(ret << BDRV_SECTOR_BITS);
}
}
}
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index dd94cd4..ae86e94 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -384,7 +384,7 @@ static int multireq_compare(const void *a, const void *b)
void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
{
int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0;
- int max_xfer_len;
+ uint32_t max_transfer;
int64_t sector_num = 0;
if (mrb->num_reqs == 1) {
@@ -393,7 +393,7 @@ void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
return;
}
- max_xfer_len = blk_get_max_transfer_length(mrb->reqs[0]->dev->blk);
+ max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk);
qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs),
&multireq_compare);
@@ -409,8 +409,9 @@ void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
*/
if (sector_num + nb_sectors != req->sector_num ||
niov > blk_get_max_iov(blk) - req->qiov.niov ||
- req->qiov.size / BDRV_SECTOR_SIZE > max_xfer_len ||
- nb_sectors > max_xfer_len - req->qiov.size / BDRV_SECTOR_SIZE) {
+ req->qiov.size > max_transfer ||
+ nb_sectors > (max_transfer -
+ req->qiov.size) / BDRV_SECTOR_SIZE) {
submit_requests(blk, mrb, start, num_reqs, niov);
num_reqs = 0;
}
diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index 0cb8568..7a588a7 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -225,14 +225,14 @@ static void scsi_read_complete(void * opaque, int ret)
if (s->type == TYPE_DISK &&
r->req.cmd.buf[0] == INQUIRY &&
r->req.cmd.buf[2] == 0xb0) {
- uint32_t max_xfer_len = blk_get_max_transfer_length(s->conf.blk) /
- (s->blocksize / BDRV_SECTOR_SIZE);
+ uint32_t max_transfer =
+ blk_get_max_transfer(s->conf.blk) / s->blocksize;
- assert(max_xfer_len);
- stl_be_p(&r->buf[8], max_xfer_len);
+ assert(max_transfer);
+ stl_be_p(&r->buf[8], max_transfer);
/* Also take care of the opt xfer len. */
- if (ldl_be_p(&r->buf[12]) > max_xfer_len) {
- stl_be_p(&r->buf[12], max_xfer_len);
+ if (ldl_be_p(&r->buf[12]) > max_transfer) {
+ stl_be_p(&r->buf[12], max_transfer);
}
}
scsi_req_data(&r->req, len);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 2057156..7d2b152 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -338,11 +338,14 @@ typedef struct BlockLimits {
* power of 2, and less than max_pwrite_zeroes if that is set */
uint32_t pwrite_zeroes_alignment;
- /* optimal transfer length in sectors */
- int opt_transfer_length;
-
- /* maximal transfer length in sectors */
- int max_transfer_length;
+ /* optimal transfer length in bytes (must be power of 2, and
+ * multiple of bs->request_alignment), or 0 if no preferred size */
+ uint32_t opt_transfer;
+
+ /* maximal transfer length in bytes (need not be power of 2, but
+ * should be multiple of opt_transfer), or 0 for no 32-bit limit.
+ * For now, anything larger than INT_MAX is clamped down. */
+ uint32_t max_transfer;
/* memory alignment so that no bounce buffer is needed */
size_t min_mem_alignment;
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index c04af8e..2469a1c 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -170,7 +170,7 @@ bool blk_is_available(BlockBackend *blk);
void blk_lock_medium(BlockBackend *blk, bool locked);
void blk_eject(BlockBackend *blk, bool eject_flag);
int blk_get_flags(BlockBackend *blk);
-int blk_get_max_transfer_length(BlockBackend *blk);
+uint32_t blk_get_max_transfer(BlockBackend *blk);
int blk_get_max_iov(BlockBackend *blk);
void blk_set_guest_block_size(BlockBackend *blk, int align);
void *blk_try_blockalign(BlockBackend *blk, size_t size);
diff --git a/qemu-img.c b/qemu-img.c
index 2351686..046b267 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2085,13 +2085,13 @@ static int img_convert(int argc, char **argv)
}
out_bs = blk_bs(out_blk);
- /* increase bufsectors from the default 4096 (2M) if opt_transfer_length
+ /* increase bufsectors from the default 4096 (2M) if opt_transfer
* or discard_alignment of the out_bs is greater. Limit to 32768 (16MB)
* as maximum. */
bufsectors = MIN(32768,
- MAX(bufsectors, MAX(out_bs->bl.opt_transfer_length,
- out_bs->bl.discard_alignment))
- );
+ MAX(bufsectors,
+ MAX(out_bs->bl.opt_transfer >> BDRV_SECTOR_BITS,
+ out_bs->bl.discard_alignment)));
if (skip_create) {
int64_t output_sectors = blk_nb_sectors(out_blk);
generated by cgit v1.1 at 2024-12-28 18:49:54 +0000