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io_uring/rsrc: add io_rsrc_node_lookup() helper

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There are lots of spots open-coding this functionality, add a generic
helper that does the node lookup in a speculation safe way.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2024-10-27 09:08:31 -06:00
parent 3597f2786b
commit b54a14041e
12 changed files with 57 additions and 59 deletions
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6
io_uring/splice.c
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@@ -66,17 +66,13 @@ static struct file *io_splice_get_file(struct io_kiocb *req,
return io_file_get_normal(req, sp->splice_fd_in);
io_ring_submit_lock(ctx, issue_flags);
if (unlikely(sp->splice_fd_in >= ctx->file_table.data.nr))
goto out;
sp->splice_fd_in = array_index_nospec(sp->splice_fd_in, ctx->file_table.data.nr);
node = ctx->file_table.data.nodes[sp->splice_fd_in];
node = io_rsrc_node_lookup(&ctx->file_table.data, sp->splice_fd_in);
if (node) {
node->refs++;
sp->rsrc_node = node;
file = io_slot_file(node);
req->flags |= REQ_F_NEED_CLEANUP;
}
out:
io_ring_submit_unlock(ctx, issue_flags);
return file;
}