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io_uring: Add skip option for __io_sqe_files_update

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This patch adds support for skipping a file descriptor when using
IORING_REGISTER_FILES_UPDATE.  __io_sqe_files_update will skip fds set
to IORING_REGISTER_FILES_SKIP. IORING_REGISTER_FILES_SKIP is inturn
added as a #define in io_uring.h

Signed-off-by: noah <goldstein.w.n@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
noah 2021-01-26 15:23:28 -05:00 committed by Jens Axboe
parent 67973b933e
commit 4e0377a1c5
2 changed files with 6 additions and 0 deletions
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3
fs/io_uring.c
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@ -8038,6 +8038,9 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
err = -EFAULT;
break;
}
if (fd == IORING_REGISTER_FILES_SKIP)
continue;
i = array_index_nospec(up->offset + done, ctx->nr_user_files);
table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
index = i & IORING_FILE_TABLE_MASK;

3
include/uapi/linux/io_uring.h
View File

@ -298,6 +298,9 @@ struct io_uring_rsrc_update {
__aligned_u64 data;
};
/* Skip updating fd indexes set to this value in the fd table */
#define IORING_REGISTER_FILES_SKIP (-2)
#define IO_URING_OP_SUPPORTED (1U << 0)
struct io_uring_probe_op {