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Subject[PATCH] io_uring: Add skip option for __io_sqe_files_update
Date
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>
---
Supporting documentation and tests in liburing can be added in PR284
(https://github.com/axboe/liburing/pull/284) if this patch is applied.

fs/io_uring.c | 3 +++
include/uapi/linux/io_uring.h | 7 +++++++
2 files changed, 10 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 2c307dea162b..03748faa5295 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8039,6 +8039,9 @@ 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;
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index f9f106c54d90..e8b481040fb3 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -298,6 +298,13 @@ struct io_uring_rsrc_update {
__aligned_u64 data;
};

+/*
+ * fd value in *((__s32 *)io_uring_rsrc_update->data)
+ */
+
+/* Skip updating fd indexes set to this value */
+#define IORING_REGISTER_FILES_SKIP (-2)
+
#define IO_URING_OP_SUPPORTED (1U << 0)

struct io_uring_probe_op {
--
2.29.2
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