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linux/io_uring
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Caleb Sander Mateos 2d0e88f3fd io_uring/rsrc: don't use blk_rq_nr_phys_segments() as number of bvecs 
io_buffer_register_bvec() currently uses blk_rq_nr_phys_segments() as
the number of bvecs in the request. However, bvecs may be split into
multiple segments depending on the queue limits. Thus, the number of
segments may overestimate the number of bvecs. For ublk devices, the
only current users of io_buffer_register_bvec(), virt_boundary_mask,
seg_boundary_mask, max_segments, and max_segment_size can all be set
arbitrarily by the ublk server process.
Set imu->nr_bvecs based on the number of bvecs the rq_for_each_bvec()
loop actually yields. However, continue using blk_rq_nr_phys_segments()
as an upper bound on the number of bvecs when allocating imu to avoid
needing to iterate the bvecs a second time.

Link: https://lore.kernel.org/io-uring/20251111191530.1268875-1-csander@purestorage.com/
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Fixes: 27cb27b6d5 ("io_uring: add support for kernel registered bvecs")
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 		2025-11-12 08:25:33 -07:00
..
Kconfig io_uring: make zcrx depend on CONFIG_IO_URING 2025-03-31 07:07:44 -06:00
Makefile io_uring: introduce io_uring querying 2025-09-08 08:06:37 -06:00
advise.c io_uring: finish IOU_OK -> IOU_COMPLETE transition 2025-05-21 08:41:16 -06:00
advise.h
…
alloc_cache.c io_uring: add alloc_cache.c 2025-01-28 15:10:40 -07:00
alloc_cache.h io_uring/net: convert to struct iou_vec 2025-03-07 13:41:08 -07:00
cancel.c io_uring: don't include filetable.h in io_uring.h 2025-09-08 13:20:46 -06:00
cancel.h io_uring/cancel: add generic cancel helper 2025-02-17 05:34:45 -07:00
cmd_net.c io_uring/uring_cmd: add support for IORING_SETUP_CQE_MIXED 2025-08-27 11:24:15 -06:00
epoll.c io_uring: finish IOU_OK -> IOU_COMPLETE transition 2025-05-21 08:41:16 -06:00
epoll.h io_uring/epoll: add support for IORING_OP_EPOLL_WAIT 2025-02-20 07:59:56 -07:00
eventfd.c io_uring/eventfd: open code io_eventfd_grab() 2025-04-24 08:33:54 -06:00
eventfd.h io_uring/eventfd: dedup signalling helpers 2025-04-24 08:33:54 -06:00
fdinfo.c io_uring/sqpoll: switch away from getrusage() for CPU accounting 2025-10-22 10:51:20 -06:00
fdinfo.h
…
filetable.c io_uring: correct __must_hold annotation in io_install_fixed_file 2025-10-23 07:25:07 -06:00
filetable.h io_uring/rsrc: pass 'struct io_ring_ctx' reference to rsrc helpers 2024-11-07 15:24:33 -07:00
fs.c io_uring: finish IOU_OK -> IOU_COMPLETE transition 2025-05-21 08:41:16 -06:00
fs.h
…
futex.c io_uring: add async data clear/free helpers 2025-08-27 11:24:25 -06:00
futex.h
…
io-wq.c io_uring/io-wq: fix `max_workers` breakage and `nr_workers` underflow 2025-09-15 10:46:13 -06:00
io-wq.h io_uring/wq: avoid indirect do_work/free_work calls 2025-04-21 05:06:58 -06:00
io_uring.c io_uring: Fix code indentation error 2025-10-22 10:56:11 -06:00
io_uring.h for-6.18/io_uring-20250929 2025-10-02 09:56:23 -07:00
kbuf.c io_uring: fix buffer auto-commit for multishot uring_cmd 2025-10-23 19:41:31 -06:00
kbuf.h io-uring: move `struct io_br_sel` into io_uring_types.h 2025-08-24 11:41:12 -06:00
memmap.c io_uring: fix types for region size calulation 2025-11-05 11:45:07 -07:00
memmap.h io_uring: update parameter name in io_pin_pages function declaration 2025-05-09 07:58:22 -06:00
mock_file.c io_uring/mock: add trivial poll handler 2025-07-02 08:10:26 -06:00
msg_ring.c io_uring/msg_ring: kill alloc_cache for io_kiocb allocations 2025-09-18 13:59:15 -06:00
msg_ring.h io_uring/msg_ring: Drop custom destructor 2024-12-27 10:08:21 -07:00
napi.c net: use napi_id_valid helper 2025-02-17 16:43:04 -08:00
napi.h io_uring/napi: add static napi tracking strategy 2024-11-06 13:55:38 -07:00
net.c io_uring: Fix code indentation error 2025-10-22 10:56:11 -06:00
net.h io_uring/net: convert to struct iou_vec 2025-03-07 13:41:08 -07:00
nop.c io_uring/nop: add support for IORING_SETUP_CQE_MIXED 2025-08-27 11:24:15 -06:00
nop.h
…
notif.c for-6.18/io_uring-20250929 2025-10-02 09:56:23 -07:00
notif.h
…
opdef.c io_uring: uring_cmd: add multishot support 2025-08-24 11:41:12 -06:00
opdef.h io_uring: add struct io_cold_def->sqe_copy() method 2025-06-23 08:59:13 -06:00
openclose.c io_uring: don't include filetable.h in io_uring.h 2025-09-08 13:20:46 -06:00
openclose.h io_uring: add support for IORING_OP_PIPE 2025-04-21 05:06:58 -06:00
poll.c for-6.18/io_uring-20250929 2025-10-02 09:56:23 -07:00
poll.h io_uring/poll: introduce io_arm_apoll() 2025-06-23 09:00:12 -06:00
query.c io_uring/query: return number of available queries 2025-11-10 14:59:35 -07:00
query.h io_uring: introduce io_uring querying 2025-09-08 08:06:37 -06:00
refs.h io_uring: always do atomic put from iowq 2025-04-03 08:31:57 -06:00
register.c io_uring/zcrx: remove sync refill uapi 2025-11-03 08:55:58 -07:00
register.h io_uring: temporarily disable registered waits 2024-11-15 09:58:34 -07:00
rsrc.c io_uring/rsrc: don't use blk_rq_nr_phys_segments() as number of bvecs 2025-11-12 08:25:33 -07:00
rsrc.h io_uring: export io_[un]account_mem 2025-07-16 16:23:28 -06:00
rw.c io_uring/rw: ensure allocated iovec gets cleared for early failure 2025-11-10 14:59:08 -07:00
rw.h io_uring/kbuf: pass bgid to io_buffer_select() 2025-04-21 05:06:58 -06:00
slist.h
…
splice.c io_uring: don't include filetable.h in io_uring.h 2025-09-08 13:20:46 -06:00
splice.h
…
sqpoll.c io_uring/sqpoll: be smarter on when to update the stime usage 2025-10-22 10:55:33 -06:00
sqpoll.h io_uring/sqpoll: switch away from getrusage() for CPU accounting 2025-10-22 10:51:20 -06:00
statx.c io_uring: finish IOU_OK -> IOU_COMPLETE transition 2025-05-21 08:41:16 -06:00
statx.h
…
sync.c io_uring: finish IOU_OK -> IOU_COMPLETE transition 2025-05-21 08:41:16 -06:00
sync.h
…
tctx.c io_uring/wq: avoid indirect do_work/free_work calls 2025-04-21 05:06:58 -06:00
tctx.h
…
timeout.c io_uring: include dying ring in task_work "should cancel" state 2025-09-18 10:24:50 -06:00
timeout.h io_uring/timeout: don't export link t-out disarm helper 2025-05-06 10:11:23 -06:00
truncate.c io_uring: finish IOU_OK -> IOU_COMPLETE transition 2025-05-21 08:41:16 -06:00
truncate.h
…
uring_cmd.c for-6.18/io_uring-20250929 2025-10-02 09:56:23 -07:00
uring_cmd.h io_uring/cmd: remove struct io_uring_cmd_data 2025-07-18 12:34:56 -06:00
waitid.c io_uring: fix incorrect unlikely() usage in io_waitid_prep() 2025-10-20 09:22:09 -06:00
waitid.h
…
xattr.c io_uring: finish IOU_OK -> IOU_COMPLETE transition 2025-05-21 08:41:16 -06:00
xattr.h
…
zcrx.c io_uring/zcrx: remove sync refill uapi 2025-11-03 08:55:58 -07:00
zcrx.h io_uring/zcrx: remove sync refill uapi 2025-11-03 08:55:58 -07:00