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authorJan Kara <jack@suse.cz>2005-10-30 18:00:16 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 20:37:17 -0500
commitaaa4059bc2dca7fa816624a28db1958c3a22df9b (patch)
tree8ae1d5458e2f68f96b033f10dae216847c32d4d2 /mm/truncate.c
parente812cb5226af32aec91bcbaa8365bd7f921b6ebb (diff)
[PATCH] ext3: Fix unmapped buffers in transaction's lists
Fix the problem (BUG 4964) with unmapped buffers in transaction's t_sync_data list. The problem is we need to call filesystem's own invalidatepage() from block_write_full_page(). block_write_full_page() must call filesystem's invalidatepage(). Otherwise following nasty race can happen: proc 1 proc 2 ------ ------ - write some new data to 'offset' => bh gets to the transactions data list - starts truncate => i_size set to new size - mpage_writepages() - ext3_ordered_writepage() to 'offset' - block_write_full_page() - page->index > end_index+1 - block_invalidatepage() - discard_buffer() - clear_buffer_mapped() - commit triggers and finds unmapped buffer - BOOM! Signed-off-by: Jan Kara <jack@suse.cz> 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.c11
1 files changed, 1 insertions, 10 deletions
diff --git a/mm/truncate.c b/mm/truncate.c
index 60c8764bfac2..29c18f68dc35 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -13,18 +13,9 @@
13#include <linux/pagemap.h> 13#include <linux/pagemap.h>
14#include <linux/pagevec.h> 14#include <linux/pagevec.h>
15#include <linux/buffer_head.h> /* grr. try_to_release_page, 15#include <linux/buffer_head.h> /* grr. try_to_release_page,
16 block_invalidatepage */ 16 do_invalidatepage */
17 17
18 18
19static int do_invalidatepage(struct page *page, unsigned long offset)
20{
21 int (*invalidatepage)(struct page *, unsigned long);
22 invalidatepage = page->mapping->a_ops->invalidatepage;
23 if (invalidatepage == NULL)
24 invalidatepage = block_invalidatepage;
25 return (*invalidatepage)(page, offset);
26}
27
28static inline void truncate_partial_page(struct page *page, unsigned partial) 19static inline void truncate_partial_page(struct page *page, unsigned partial)
29{ 20{
30 memclear_highpage_flush(page, partial, PAGE_CACHE_SIZE-partial); 21 memclear_highpage_flush(page, partial, PAGE_CACHE_SIZE-partial);