Commit 547edce3 authored Nov 08, 2016 by Ross Zwisler Committed by Dave Chinner Nov 08, 2016

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 <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dave Chinner <david@fromorbit.com>

parent 1001354c

fs/ext4/inode.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

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