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authorPavel Begunkov <asml.silence@gmail.com>2021-05-14 12:06:44 +0100
committerJens Axboe <axboe@kernel.dk>2021-05-14 06:06:34 -0600
commit489809e2e22b3dedc0737163d97eb2b574137b42 (patch)
tree805022dc47141333937544b00406035b2df41d4f /fs
parent2d74d0421e5afc1e7be7167ffb7eb8b2cf32343a (diff)
downloadlwn-489809e2e22b3dedc0737163d97eb2b574137b42.tar.gz
lwn-489809e2e22b3dedc0737163d97eb2b574137b42.zip
io_uring: increase max number of reg buffers
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/io_uring.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 29ec5b28c73d..e481ac8a757a 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -100,6 +100,8 @@
#define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_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| \
IOSQE_IO_HARDLINK | IOSQE_ASYNC | \
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)
return -EBUSY;
- if (!nr_args || nr_args > UIO_MAXIOV)
+ if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS)
return -EINVAL;
ret = io_rsrc_node_switch_start(ctx);
if (ret)