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* [PATCHSET v2 0/6] Allow allocated direct descriptors
@ 2022-05-09 15:50 Jens Axboe
  2022-05-09 15:50 ` [PATCH 1/6] io_uring: track fixed files with a bitmap Jens Axboe
                   ` (5 more replies)
  0 siblings, 6 replies; 7+ messages in thread
From: Jens Axboe @ 2022-05-09 15:50 UTC (permalink / raw)
  To: io-uring; +Cc: asml.silence, haoxu.linux

Hi,

Currently using direct descriptors with open or accept requires the
application to manage the descriptor space, picking which slot to use
for any given file. However, there are cases where it's useful to just
get a direct descriptor and not care about which value it is, instead
just return it like a normal open or accept would.

This will also be useful for multishot accept support, where allocated
direct descriptors are a requirement to make that feature work with
these kinds of files.

This adds support for allocating a new fixed descriptor. This is chosen
by passing in IORING_FILE_INDEX_ALLOC as the fixed slot, which is beyond
any valid value for the file_index.

Can also be found here:

https://git.kernel.dk/cgit/linux-block/log/?h=for-5.19/io_uring-fixed-alloc

 fs/io_uring.c                 | 113 +++++++++++++++++++++++++++++++---
 include/uapi/linux/io_uring.h |  17 ++++-
 2 files changed, 120 insertions(+), 10 deletions(-)

v2:	- Fix unnecessary clear (Hao)
	- Add define for allocating a descriptor rather than use
	  UINT_MAX.
	- Add patch bumping max file table size to 1M (from 32K)
	- Add ability to register a sparse file table upfront rather
	  then have the application pass in a big array of -1.

-- 
Jens Axboe




^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2022-05-09 15:51 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-05-09 15:50 [PATCHSET v2 0/6] Allow allocated direct descriptors Jens Axboe
2022-05-09 15:50 ` [PATCH 1/6] io_uring: track fixed files with a bitmap Jens Axboe
2022-05-09 15:50 ` [PATCH 2/6] io_uring: add basic fixed file allocator Jens Axboe
2022-05-09 15:50 ` [PATCH 3/6] io_uring: allow allocated fixed files for openat/openat2 Jens Axboe
2022-05-09 15:50 ` [PATCH 4/6] io_uring: allow allocated fixed files for accept Jens Axboe
2022-05-09 15:50 ` [PATCH 5/6] io_uring: bump max direct descriptor count to 1M Jens Axboe
2022-05-09 15:50 ` [PATCH 6/6] io_uring: add flag for allocating a fully sparse direct descriptor space Jens Axboe

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