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Code Issues Releases Wiki Activity

io_uring/rw: ensure kiocb_end_write() is always called

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commit 2ec33a6c3c upstream.

A previous commit moved the notifications and end-write handling, but
it is now missing a few spots where we also want to call both of those.
Without that, we can potentially be missing file notifications, and
more importantly, have an imbalance in the super_block writers sem
accounting.

Fixes: b000145e99 ("io_uring/rw: defer fsnotify calls to task context")
Reported-by: Dave Chinner <david@fromorbit.com>
Link: https://lore.kernel.org/all/20221010050319.GC2703033@dread.disaster.area/
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2023-01-22 10:36:37 -07:00 committed by Greg Kroah-Hartman
parent c1a279d79e
commit 3d5f181bda
1 changed files with 37 additions and 20 deletions
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57
io_uring/io_uring.c
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@ -2700,11 +2700,34 @@ static bool io_rw_should_reissue(struct io_kiocb *req)
}
#endif
/*
* Trigger the notifications after having done some IO, and finish the write
* accounting, if any.
*/
static void io_req_io_end(struct io_kiocb *req)
{
struct io_rw *rw = &req->rw;
WARN_ON(!in_task());
if (rw->kiocb.ki_flags & IOCB_WRITE) {
kiocb_end_write(req);
fsnotify_modify(req->file);
} else {
fsnotify_access(req->file);
}
}
static bool __io_complete_rw_common(struct io_kiocb *req, long res)
{
if (res != req->result) {
if ((res == -EAGAIN || res == -EOPNOTSUPP) &&
io_rw_should_reissue(req)) {
/*
* Reissue will start accounting again, finish the
* current cycle.
*/
io_req_io_end(req);
req->flags |= REQ_F_REISSUE;
return true;
}
@ -2746,25 +2769,9 @@ static void io_req_task_complete(struct io_kiocb *req, bool *locked)
}
}
static void __io_complete_rw(struct io_kiocb *req, long res, long res2,
unsigned int issue_flags)
{
if (__io_complete_rw_common(req, res))
return;
__io_req_complete(req, issue_flags, io_fixup_rw_res(req, res), io_put_rw_kbuf(req));
}
static void io_req_rw_complete(struct io_kiocb *req, bool *locked)
{
struct io_rw *rw = &req->rw;
if (rw->kiocb.ki_flags & IOCB_WRITE) {
kiocb_end_write(req);
fsnotify_modify(req->file);
} else {
fsnotify_access(req->file);
}
io_req_io_end(req);
io_req_task_complete(req, locked);
}
@ -3032,10 +3039,20 @@ static void kiocb_done(struct kiocb *kiocb, ssize_t ret,
if (req->flags & REQ_F_CUR_POS)
req->file->f_pos = kiocb->ki_pos;
if (ret >= 0 && (kiocb->ki_complete == io_complete_rw))
__io_complete_rw(req, ret, 0, issue_flags);
else
if (ret >= 0 && (kiocb->ki_complete == io_complete_rw)) {
if (!__io_complete_rw_common(req, ret)) {
/*
* Safe to call io_end from here as we're inline
* from the submission path.
*/
io_req_io_end(req);
__io_req_complete(req, issue_flags,
io_fixup_rw_res(req, ret),
io_put_rw_kbuf(req));
}
} else {
io_rw_done(kiocb, ret);
}
if (req->flags & REQ_F_REISSUE) {
req->flags &= ~REQ_F_REISSUE;