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io_uring: add end-of-bits marker and build time verify it

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Not easy to tell if we're going over the size of bits we can shove
in req->flags, so add an end-of-bits marker and a BUILD_BUG_ON()
check for it.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-03-03 15:28:17 -07:00
parent 067524e914
commit 84557871f2
1 changed files with 4 additions and 0 deletions
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4
fs/io_uring.c
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@ -511,6 +511,9 @@ enum {
REQ_F_OVERFLOW_BIT, REQ_F_OVERFLOW_BIT,
REQ_F_POLLED_BIT, REQ_F_POLLED_BIT,
REQ_F_BUFFER_SELECTED_BIT, REQ_F_BUFFER_SELECTED_BIT,
/* not a real bit, just to check we're not overflowing the space */
__REQ_F_LAST_BIT,
}; };
enum { enum {
@ -7998,6 +8001,7 @@ static int __init io_uring_init(void)
BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in);
BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST);
BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int));
req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
return 0; return 0;
}; };