From c37a78e51afb104a27e26291408c853002a575b8 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 16 Nov 2011 19:55:24 +0800 Subject: [PATCH] fs: Make write(2) interruptible by SIGKILL Currently write(2) to a file is not interruptible by a signal. Sometimes this is desirable (e.g. when you want to quickly kill a process hogging your disk or when some process gets blocked in balance_dirty_pages() indefinitely due to a filesystem being in an error condition). Reported-by: Kazuya Mio Tested-by: Kazuya Mio Signed-off-by: Jan Kara Signed-off-by: Wu Fengguang --- mm/filemap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index c0018f2d50e0..c106d3b3cc64 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2407,7 +2407,6 @@ static ssize_t generic_perform_write(struct file *file, iov_iter_count(i)); again: - /* * Bring in the user page that we will copy from _first_. * Otherwise there's a nasty deadlock on copying from the @@ -2463,7 +2462,10 @@ again: written += copied; balance_dirty_pages_ratelimited(mapping); - + if (fatal_signal_pending(current)) { + status = -EINTR; + break; + } } while (iov_iter_count(i)); return written ? written : status; -- 2.39.5