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fs: make cont_expand_zero interruptible

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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>
This commit is contained in:
Mikulas Patocka 2014-07-27 13:00:41 -04:00 committed by Al Viro
parent c35e024800
commit c2ca0fcd20
1 changed files with 5 additions and 0 deletions
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5
fs/buffer.c
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@ -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 */