Merge tag 'xfs-for-linus-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...

[pandora-kernel.git] / fs / ext4 / inode.c

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f8a8d4e..41f8e55 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -656,18 +656,6 @@ has_zeroout:
        return retval;
 }
 
-static void ext4_end_io_unwritten(struct buffer_head *bh, int uptodate)
-{
-       struct inode *inode = bh->b_assoc_map->host;
-       /* XXX: breaks on 32-bit > 16GB. Is that even supported? */
-       loff_t offset = (loff_t)(uintptr_t)bh->b_private << inode->i_blkbits;
-       int err;
-       if (!uptodate)
-               return;
-       WARN_ON(!buffer_unwritten(bh));
-       err = ext4_convert_unwritten_extents(NULL, inode, offset, bh->b_size);
-}
-
 /* Maximum number of blocks we map for direct IO at once. */
 #define DIO_MAX_BLOCKS 4096
 
@@ -705,10 +693,15 @@ static int _ext4_get_block(struct inode *inode, sector_t iblock,
 
                map_bh(bh, inode->i_sb, map.m_pblk);
                bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags;
-               if (IS_DAX(inode) && buffer_unwritten(bh) && !io_end) {
+               if (IS_DAX(inode) && buffer_unwritten(bh)) {
+                       /*
+                        * dgc: I suspect unwritten conversion on ext4+DAX is
+                        * fundamentally broken here when there are concurrent
+                        * read/write in progress on this inode.
+                        */
+                       WARN_ON_ONCE(io_end);
                        bh->b_assoc_map = inode->i_mapping;
                        bh->b_private = (void *)(unsigned long)iblock;
-                       bh->b_end_io = ext4_end_io_unwritten;
                }
                if (io_end && io_end->flag & EXT4_IO_END_UNWRITTEN)
                        set_buffer_defer_completion(bh);