I've applied this to the ext4 patch queue with the following changelog
comment.
From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
ext4: Fix mmap/truncate race when blocksize < pagesize && !nodellaoc
This patch fixes the mmap/truncate race that was fixed for delayed
allocation by merging ext4_{journalled,normal,da}_writepage() into
ext4_writepage().
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Acked-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
I also had to apply the following fix so that the patch would compile:
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 1359aa1..24c8634 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -44,6 +44,10 @@
#define MPAGE_DA_EXTENT_TAIL 0x01
+static int __ext4_journalled_writepage(struct page *page,
+ struct writeback_control *wbc,
+ unsigned int len);
+
static inline int ext4_begin_ordered_truncate(struct inode *inode,
loff_t new_size)
{
- Ted
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