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io_uring: increase max number of reg buffers

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Since recent changes instead of storing a large array of struct
io_mapped_ubuf, we store pointers to them, that is 4 times slimmer and
we should not to so worry about restricting max number of registererd
buffer slots, increase the limit 4 times.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d3dee1da37f46da416aa96a16bf9e5094e10584d.1620990371.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-05-14 12:06:44 +01:00 • committed by Jens Axboe
parent 2d74d0421e
commit 489809e2e2
1 changed files with 3 additions and 1 deletions
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4
fs/io_uring.c
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@ -100,6 +100,8 @@
#define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \
IORING_REGISTER_LAST + IORING_OP_LAST) IORING_REGISTER_LAST + IORING_OP_LAST)
#define IORING_MAX_REG_BUFFERS (1U << 14)
#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \
IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ IOSQE_IO_HARDLINK | IOSQE_ASYNC | \
IOSQE_BUFFER_SELECT) IOSQE_BUFFER_SELECT)
@ -8389,7 +8391,7 @@ static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
if (ctx->user_bufs) if (ctx->user_bufs)
return -EBUSY; return -EBUSY;
if (!nr_args || nr_args > UIO_MAXIOV) if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS)
return -EINVAL; return -EINVAL;
ret = io_rsrc_node_switch_start(ctx); ret = io_rsrc_node_switch_start(ctx);
if (ret) if (ret)