fs: Make write(2) interruptible by a fatal signal
authorJan Kara <jack@suse.cz>
Fri, 2 Dec 2011 01:17:02 +0000 (09:17 +0800)
committerWu Fengguang <fengguang.wu@intel.com>
Fri, 2 Dec 2011 01:17:05 +0000 (09:17 +0800)
commita50527b19c62c808a7fca022816fff88a50b948d
tree6f9bb1a5176b1a428ce272d398a2c784ee12f2eb
parent786228ab3095fe18dba3bc0d62055a123991d9d9
fs: Make write(2) interruptible by a fatal signal

Currently write(2) to a file is not interruptible by any signal.
Sometimes this is desirable, e.g. when you want to quickly kill a
process hogging your disk. Also, with commit 499d05ecf990 ("mm: Make
task in balance_dirty_pages() killable"), it's necessary to abort the
current write accordingly to avoid it quickly dirtying lots more pages
at unthrottled rate.

This patch makes write interruptible by SIGKILL. We do not allow write
to be interruptible by any other signal because that has larger
potential of screwing some badly written applications.

Reported-by: Kazuya Mio <k-mio@sx.jp.nec.com>
Tested-by: Kazuya Mio <k-mio@sx.jp.nec.com>
Acked-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
mm/filemap.c