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| author | Mikulas Patocka <mpatocka@redhat.com> | 2014-07-27 13:00:41 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2014-10-09 02:39:03 -0400 |
| commit | c2ca0fcd202863b14bd041a7fece2e789926c225 (patch) | |
| tree | 3f2691b8fb5b471bad886dce7a2680b824b081dd | |
| parent | c35e02480014f7a86e264a2fda39a568690163da (diff) | |
| download | lwn-c2ca0fcd202863b14bd041a7fece2e789926c225.tar.gz lwn-c2ca0fcd202863b14bd041a7fece2e789926c225.zip | |
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>
| -rw-r--r-- | fs/buffer.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 3588a80854b2..c8a1c01d6187 100644 --- 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 */ |