btrfs: add io_uring interface for encoded writes

Browse source

Add an io_uring interface for encoded writes, with the same parameters
as the BTRFS_IOC_ENCODED_WRITE ioctl.

As with the encoded reads code, there's a test program for this at
https://github.com/maharmstone/io_uring-encoded, and I'll get this
worked into an fstest.

How io_uring works is that it initially calls btrfs_uring_cmd with the
IO_URING_F_NONBLOCK flag set, and if we return -EAGAIN it tries again in
a kthread with the flag cleared.

Ideally we'd honour this and call try_lock etc., but there's still a lot
of work to be done to create non-blocking versions of all the functions
in our write path. Instead, just validate the input in
btrfs_uring_encoded_write() on the first pass and return -EAGAIN, with a
view to properly optimizing the optimistic path later on.

Signed-off-by: Mark Harmstone <maharmstone@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>

...

This commit is contained in:

Mark Harmstone 2025-01-10 17:23:52 +00:00 • committed by David Sterba

parent bf50aca633

commit e32dcdb0af

1 changed files with 128 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

128

fs/btrfs/ioctl.c

View file