From 547edce3ba234a5161c6e1f4389f4a0d2f8451aa Mon Sep 17 00:00:00 2001 From: Ross Zwisler Date: Tue, 8 Nov 2016 11:30:58 +1100 Subject: [PATCH] ext4: tell DAX the size of allocation holes When DAX calls _ext4_get_block() and the file offset points to a hole we currently don't set bh->b_size. This is current worked around via buffer_size_valid() in fs/dax.c. _ext4_get_block() has the hole size information from ext4_map_blocks(), so populate bh->b_size so we can remove buffer_size_valid() in a later patch. Signed-off-by: Ross Zwisler Reviewed-by: Jan Kara Signed-off-by: Dave Chinner --- fs/ext4/inode.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 9c064727ed62..3d58b2b477e8 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -767,6 +767,9 @@ static int _ext4_get_block(struct inode *inode, sector_t iblock, ext4_update_bh_state(bh, map.m_flags); bh->b_size = inode->i_sb->s_blocksize * map.m_len; ret = 0; + } else if (ret == 0) { + /* hole case, need to fill in bh->b_size */ + bh->b_size = inode->i_sb->s_blocksize * map.m_len; } return ret; } -- 2.20.1