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io_uring: let to set a range for file slot allocation

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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 <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/66ab0394e436f38437cf7c44676e1920d09687ad.1656154403.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2022-06-25 11:55:38 +01:00
committed by Jens Axboe
parent e6130eba8a
commit 6e73dffbb9
6 changed files with 61 additions and 7 deletions
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13
include/uapi/linux/io_uring.h
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@@ -449,6 +449,9 @@ enum {
/* sync cancelation API */
IORING_REGISTER_SYNC_CANCEL = 24,
/* register a range of fixed file slots for automatic slot allocation */
IORING_REGISTER_FILE_ALLOC_RANGE = 25,
/* this goes last */
IORING_REGISTER_LAST
};
@@ -595,4 +598,14 @@ struct io_uring_sync_cancel_reg {
__u64 pad[4];
};
/*
* Argument for IORING_REGISTER_FILE_ALLOC_RANGE
* The range is specified as [off, off + len)
*/
struct io_uring_file_index_range {
__u32 off;
__u32 len;
__u64 resv;
};
#endif