ext2: use iomap_zero_range() for zeroing truncated page in DAX path

Currently the last user of ext2_get_blocks() for DAX inodes was
dax_truncate_page(). Convert that to iomap_zero_range() so that all DAX
IO uses the iomap path.

Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 8 insertions, 3 deletions

diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 41b8b44a391c..046b642f3585 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -850,6 +850,9 @@ struct iomap_ops ext2_iomap_ops = {
         .iomap_begin            = ext2_iomap_begin,
         .iomap_end              = ext2_iomap_end,
 };
+#else
+/* Define empty ops for !CONFIG_FS_DAX case to avoid ugly ifdefs */
+struct iomap_ops ext2_iomap_ops;
 #endif /* CONFIG_FS_DAX */
 
 int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
@@ -1293,9 +1296,11 @@ static int ext2_setsize(struct inode *inode, loff_t newsize)
 
         inode_dio_wait(inode);
 
-        if (IS_DAX(inode))
-                error = dax_truncate_page(inode, newsize, ext2_get_block);
-        else if (test_opt(inode->i_sb, NOBH))
+        if (IS_DAX(inode)) {
+                error = iomap_zero_range(inode, newsize,
+                                         PAGE_ALIGN(newsize) - newsize, NULL,
+                                         &ext2_iomap_ops);
+        } else if (test_opt(inode->i_sb, NOBH))
                 error = nobh_truncate_page(inode->i_mapping,
                                 newsize, ext2_get_block);
         else