Jens Axboe 838b35bb6a io_uring/rw: disable IOCB_DIO_CALLER_COMP ... If an application does O_DIRECT writes with io_uring and the file system supports IOCB_DIO_CALLER_COMP, then completions of the dio write side is done from the task_work that will post the completion event for said write as well. Whenever a dio write is done against a file, the inode i_dio_count is elevated. This enables other callers to use inode_dio_wait() to wait for previous writes to complete. If we defer the full dio completion to task_work, we are dependent on that task_work being run before the inode i_dio_count can be decremented. If the same task that issues io_uring dio writes with IOCB_DIO_CALLER_COMP performs a synchronous system call that calls inode_dio_wait(), then we can deadlock as we're blocked sleeping on the event to become true, but not processing the completions that will result in the inode i_dio_count being decremented. Until we can guarantee that this is the case, then disable the deferred caller completions. Fixes: 099ada2c87 ("io_uring/rw: add write support for IOCB_DIO_CALLER_COMP") Reported-by: Andres Freund <andres@anarazel.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2023-10-25 08:02:29 -06:00
..
advise.c
advise.h
alloc_cache.h
cancel.c
cancel.h
epoll.c
epoll.h
fdinfo.c	io_uring/fdinfo: lock SQ thread while retrieving thread cpu/pid	2023-10-25 07:44:14 -06:00
fdinfo.h
filetable.c
filetable.h
fs.c	io_uring/fs: remove sqe->rw_flags checking from LINKAT	2023-09-29 03:07:09 -06:00
fs.h
io_uring.c	io_uring: fix crash with IORING_SETUP_NO_MMAP and invalid SQ ring address	2023-10-18 09:22:14 -06:00
io_uring.h	io_uring: ensure io_lockdep_assert_cq_locked() handles disabled rings	2023-10-03 08:12:54 -06:00
io-wq.c	io-wq: fully initialize wqe before calling cpuhp_state_add_instance_nocalls()	2023-10-05 14:11:18 -06:00
io-wq.h	io_uring: break out of iowq iopoll on teardown	2023-09-07 09:02:27 -06:00
kbuf.c	io_uring/kbuf: don't allow registered buffer rings on highmem pages	2023-10-03 08:12:28 -06:00
kbuf.h
Makefile
msg_ring.c
msg_ring.h
net.c	io_uring/net: fix iter retargeting for selected buf	2023-09-14 10:12:55 -06:00
net.h
nop.c
nop.h
notif.c
notif.h
opdef.c
opdef.h
openclose.c
openclose.h
poll.c
poll.h
refs.h
rsrc.c
rsrc.h
rw.c	io_uring/rw: disable IOCB_DIO_CALLER_COMP	2023-10-25 08:02:29 -06:00
rw.h
slist.h
splice.c
splice.h
sqpoll.c	io_uring: Don't set affinity on a dying sqpoll thread	2023-08-30 09:53:44 -06:00
sqpoll.h
statx.c
statx.h
sync.c
sync.h
tctx.c
tctx.h
timeout.c
timeout.h
uring_cmd.c
uring_cmd.h
xattr.c
xattr.h