diff options
| author | Andrew Morton <akpm@osdl.org> | 2006-12-21 11:00:33 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-21 11:17:26 -0800 |
| commit | 3e67c0987d7567ad666641164a153dca9a43b11d (patch) | |
| tree | e8bd583fc8fe6e9e2e8533319a30577c0081f70e /mm/truncate.c | |
| parent | 921320210bd2ec4f17053d283355b73048ac0e56 (diff) | |
[PATCH] truncate: clear page dirtiness before running try_to_free_buffers()
truncate presently invalidates the dirty page's buffer_heads then shoots down
the page. But try_to_free_buffers() will now bale out because the page is
dirty.
Net effect: the LRU gets filled with dirty pages which have invalidated
buffer_heads attached. They have no ->mapping and hence cannot be cleaned.
The machine leaks memory at an enormous rate.
Fix this by cleaning the page before running try_to_free_buffers(), so
try_to_free_buffers() can do its work.
Also, remember to do dirty-page-acoounting in cancel_dirty_page() so the
machine won't wedge up trying to write non-existent dirty pages.
Probably still wrong, but now less so.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/truncate.c')
| -rw-r--r-- | mm/truncate.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/mm/truncate.c b/mm/truncate.c index bf9e2965d666..89a5c359b6e8 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -60,11 +60,12 @@ void cancel_dirty_page(struct page *page, unsigned int account_size) WARN_ON(++warncount < 5); } - if (TestClearPageDirty(page) && account_size) + if (TestClearPageDirty(page) && account_size) { + dec_zone_page_state(page, NR_FILE_DIRTY); task_io_account_cancelled_write(account_size); + } } - /* * If truncate cannot remove the fs-private metadata from the page, the page * becomes anonymous. It will be left on the LRU and may even be mapped into @@ -81,11 +82,11 @@ truncate_complete_page(struct address_space *mapping, struct page *page) if (page->mapping != mapping) return; + cancel_dirty_page(page, PAGE_CACHE_SIZE); + if (PagePrivate(page)) do_invalidatepage(page, 0); - cancel_dirty_page(page, PAGE_CACHE_SIZE); - ClearPageUptodate(page); ClearPageMappedToDisk(page); remove_from_page_cache(page); |