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Subject[PATCH 10/11] vfs: Export wakeup_pdflush
When we are running out of free space on a filesystem, we want to flush dirty
pages in the filesystem so that blocks reserved via delayed allocation get
written and unnecessary block reservation is released. Export wakeup_pdflush()
so that filesystem can start such writeback.

Signed-off-by: Jan Kara <>
mm/page-writeback.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index bb553c3..43af1cf 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -730,6 +730,7 @@ int wakeup_pdflush(long nr_pages)
return pdflush_operation(background_writeout, nr_pages);

static void wb_timer_fn(unsigned long unused);
static void laptop_timer_fn(unsigned long unused);

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