From 6e73dffbb93cb8797cd4e42e98d837edf0f1a967 Mon Sep 17 00:00:00 2001 From: Pavel Begunkov Date: Sat, 25 Jun 2022 11:55:38 +0100 Subject: io_uring: let to set a range for file slot allocation From recently io_uring provides an option to allocate a file index for operation registering fixed files. However, it's utterly unusable with mixed approaches when for a part of files the userspace knows better where to place it, as it may race and users don't have any sane way to pick a slot and hoping it will not be taken. Let the userspace to register a range of fixed file slots in which the auto-allocation happens. The use case is splittting the fixed table in two parts, where on of them is used for auto-allocation and another for slot-specified operations. Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/66ab0394e436f38437cf7c44676e1920d09687ad.1656154403.git.asml.silence@gmail.com Signed-off-by: Jens Axboe --- io_uring/rsrc.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'io_uring/rsrc.c') diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c index 706fa020505b..d2e589c703d0 100644 --- a/io_uring/rsrc.c +++ b/io_uring/rsrc.c @@ -1012,6 +1012,8 @@ int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, io_file_bitmap_set(&ctx->file_table, i); } + /* default it to the whole table */ + io_file_table_set_alloc_range(ctx, 0, ctx->nr_user_files); io_rsrc_node_switch(ctx, NULL); return 0; fail: -- cgit v1.2.3-58-ga151