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-rw-r--r--fs/ext3/inode.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 5fa453b49a64..05e5c2e5c0d7 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1435,6 +1435,10 @@ static int journal_dirty_data_fn(handle_t *handle, struct buffer_head *bh)
return 0;
}
+static int buffer_unmapped(handle_t *handle, struct buffer_head *bh)
+{
+ return !buffer_mapped(bh);
+}
/*
* Note that we always start a transaction even if we're not journalling
* data. This is to preserve ordering: any hole instantiation within
@@ -1505,6 +1509,15 @@ static int ext3_ordered_writepage(struct page *page,
if (ext3_journal_current_handle())
goto out_fail;
+ if (!page_has_buffers(page)) {
+ create_empty_buffers(page, inode->i_sb->s_blocksize,
+ (1 << BH_Dirty)|(1 << BH_Uptodate));
+ } else if (!walk_page_buffers(NULL, page_buffers(page), 0, PAGE_CACHE_SIZE, NULL, buffer_unmapped)) {
+ /* Provide NULL instead of get_block so that we catch bugs if buffers weren't really mapped */
+ return block_write_full_page(page, NULL, wbc);
+ }
+ page_bufs = page_buffers(page);
+
handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode));
if (IS_ERR(handle)) {
@@ -1512,11 +1525,6 @@ static int ext3_ordered_writepage(struct page *page,
goto out_fail;
}
- if (!page_has_buffers(page)) {
- create_empty_buffers(page, inode->i_sb->s_blocksize,
- (1 << BH_Dirty)|(1 << BH_Uptodate));
- }
- page_bufs = page_buffers(page);
walk_page_buffers(handle, page_bufs, 0,
PAGE_CACHE_SIZE, NULL, bget_one);
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