fs: make cont_expand_zero interruptible

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@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/buffer.c b/fs/buffer.c
index 3588a80854b27acb18d185d437662d03668eddae..c8a1c01d61872986de7f8a751582b990045e7ec0 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2318,6 +2318,11 @@ static int cont_expand_zero(struct file *file, struct address_space *mapping,
                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 */