[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>

diff --git a/fs/buffer.c b/fs/buffer.c
index 2066e4c..75cac9a 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1637,6 +1637,15 @@ out:
 }
 EXPORT_SYMBOL(block_invalidatepage);
 
+int do_invalidatepage(struct page *page, unsigned long offset)
+{
+       int (*invalidatepage)(struct page *, unsigned long);
+       invalidatepage = page->mapping->a_ops->invalidatepage;
+       if (invalidatepage == NULL)
+               invalidatepage = block_invalidatepage;
+       return (*invalidatepage)(page, offset);
+}
+
 /*
  * We attach and possibly dirty the buffers atomically wrt
  * __set_page_dirty_buffers() via private_lock.  try_to_free_buffers
@@ -2696,7 +2705,7 @@ int block_write_full_page(struct page *page, get_block_t *get_block,
                 * they may have been added in ext3_writepage().  Make them
                 * freeable here, so the page does not leak.
                 */
-               block_invalidatepage(page, 0);
+               do_invalidatepage(page, 0);
                unlock_page(page);
                return 0; /* don't care */
        }

diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index c937d6e..1db061b 100644 (file)
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -190,6 +190,7 @@ extern int buffer_heads_over_limit;
  */
 int try_to_release_page(struct page * page, gfp_t gfp_mask);
 int block_invalidatepage(struct page *page, unsigned long offset);
+int do_invalidatepage(struct page *page, unsigned long offset);
 int block_write_full_page(struct page *page, get_block_t *get_block,
                                struct writeback_control *wbc);
 int block_read_full_page(struct page*, get_block_t*);

diff --git a/mm/truncate.c b/mm/truncate.c
index 60c8764..29c18f6 100644 (file)
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -13,18 +13,9 @@
 #include <linux/pagemap.h>
 #include <linux/pagevec.h>
 #include <linux/buffer_head.h> /* grr. try_to_release_page,
-                                  block_invalidatepage */
+                                  do_invalidatepage */
 
 
-static int do_invalidatepage(struct page *page, unsigned long offset)
-{
-       int (*invalidatepage)(struct page *, unsigned long);
-       invalidatepage = page->mapping->a_ops->invalidatepage;
-       if (invalidatepage == NULL)
-               invalidatepage = block_invalidatepage;
-       return (*invalidatepage)(page, offset);
-}
-
 static inline void truncate_partial_page(struct page *page, unsigned partial)
 {
        memclear_highpage_flush(page, partial, PAGE_CACHE_SIZE-partial);