btrfs: don't stash io_uring encoded data across -EAGAIN

Browse source

Returning -EAGAIN while leaving btrfs_uring_encoded_data in the cmd PDU
leaks if the request is cancelled or the ring exits before reissue.
io_uring does not free driver PDU allocations on cleanup.

Write: io_queue_sqe() always issues with IO_URING_F_NONBLOCK first, so
return -EAGAIN before allocating and free data on every exit.

Read: free on nowait -EAGAIN too; only -EIOCBQUEUED keeps the allocation
for btrfs_uring_read_finished().

Fixes: 34310c442e ("btrfs: add io_uring command for encoded reads (ENCODED_READ ioctl)")
Fixes: e32dcdb0af ("btrfs: add io_uring interface for encoded writes")
Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

...

This commit is contained in:

Yang Xiuwei 2026-08-19 10:54:35 +08:00 • committed by David Sterba

parent b6e8add5d7

commit 51562a8cb1

1 changed files with 11 additions and 9 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

20

fs/btrfs/ioctl.c

View file