This is a note to let you know that I've just added the patch titled
fs: make cont_expand_zero interruptible
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fs-make-cont_expand_zero-interruptible.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c2ca0fcd202863b14bd041a7fece2e789926c225 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Date: Sun, 27 Jul 2014 13:00:41 -0400
Subject: fs: make cont_expand_zero interruptible
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
commit c2ca0fcd202863b14bd041a7fece2e789926c225 upstream.
This patch makes it possible to kill a process looping in
cont_expand_zero. A process may spend a lot of time in this function, so
it is desirable to be able to kill it.
It happened to me that I wanted to copy a piece data from the disk to a
file. By mistake, I used the "seek" parameter to dd instead of "skip". Due
to the "seek" parameter, dd attempted to extend the file and became stuck
doing so - the only possibility was to reset the machine or wait many
hours until the filesystem runs out of space and cont_expand_zero fails.
We need this patch to be able to terminate the process.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/buffer.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2318,6 +2318,11 @@ static int cont_expand_zero(struct file
err = 0;
balance_dirty_pages_ratelimited(mapping);
+
+ if (unlikely(fatal_signal_pending(current))) {
+ err = -EINTR;
+ goto out;
+ }
}
/* page covers the boundary, find the boundary offset */
Patches currently in stable-queue which might be from mpatocka@xxxxxxxxxx are
queue-3.17/fs-make-cont_expand_zero-interruptible.patch
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