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-rw-r--r--mm/truncate.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/mm/truncate.c b/mm/truncate.c
index 4a38dd1..ecdfdcc 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -60,12 +60,16 @@ void cancel_dirty_page(struct page *page, unsigned int account_size)
WARN_ON(++warncount < 5);
}
- if (TestClearPageDirty(page) && account_size &&
- mapping_cap_account_dirty(page->mapping)) {
- dec_zone_page_state(page, NR_FILE_DIRTY);
- task_io_account_cancelled_write(account_size);
+ if (TestClearPageDirty(page)) {
+ struct address_space *mapping = page->mapping;
+ if (mapping && mapping_cap_account_dirty(mapping)) {
+ dec_zone_page_state(page, NR_FILE_DIRTY);
+ if (account_size)
+ task_io_account_cancelled_write(account_size);
+ }
}
}
+EXPORT_SYMBOL(cancel_dirty_page);
/*
* If truncate cannot remove the fs-private metadata from the page, the page
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