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authorNeilBrown <neilb@suse.de>2014-09-25 07:55:19 +0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-09-25 16:23:57 +0400
commitcbbce82209490df8b68da9aec0d642451fe0a668 (patch)
tree0c8d643c6bc34332c8b00300a6440f87701039c3 /mm/filemap.c
parente87b4c7a7ac6d895846570dec637744cf7050df3 (diff)
downloadlinux-cbbce82209490df8b68da9aec0d642451fe0a668.tar.xz
SCHED: add some "wait..on_bit...timeout()" interfaces.
In commit c1221321b7c25b53204447cff9949a6d5a7ddddc sched: Allow wait_on_bit_action() functions to support a timeout I suggested that a "wait_on_bit_timeout()" interface would not meet my need. This isn't true - I was just over-engineering. Including a 'private' field in wait_bit_key instead of a focused "timeout" field was just premature generalization. If some other use is ever found, it can be generalized or added later. So this patch renames "private" to "timeout" with a meaning "stop waiting when "jiffies" reaches or passes "timeout", and adds two of the many possible wait..bit..timeout() interfaces: wait_on_page_bit_killable_timeout(), which is the one I want to use, and out_of_line_wait_on_bit_timeout() which is a reasonably general example. Others can be added as needed. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: NeilBrown <neilb@suse.de> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 90effcdf948d..cbe5a9013f70 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -703,6 +703,19 @@ int wait_on_page_bit_killable(struct page *page, int bit_nr)
bit_wait_io, TASK_KILLABLE);
}
+int wait_on_page_bit_killable_timeout(struct page *page,
+ int bit_nr, unsigned long timeout)
+{
+ DEFINE_WAIT_BIT(wait, &page->flags, bit_nr);
+
+ wait.key.timeout = jiffies + timeout;
+ if (!test_bit(bit_nr, &page->flags))
+ return 0;
+ return __wait_on_bit(page_waitqueue(page), &wait,
+ bit_wait_io_timeout, TASK_KILLABLE);
+}
+EXPORT_SYMBOL_GPL(wait_on_page_bit_killable_timeout);
+
/**
* add_page_wait_queue - Add an arbitrary waiter to a page's wait queue
* @page: Page defining the wait queue of interest