430f1fbf02e0
parent cbcc83265d929ac71553c1b5dafdb830171af947
author Li Zefan <lizf@cn.fujitsu.com> 1314950199 +0800
committer David Sterba <dsterba@suse.cz> 1319127035 +0200

Btrfs: use i_size_read() in btrfs_defrag_file()

Don't use inode->i_size directly, since we're not holding i_mutex.

This also fixes another bug, that i_size can change after it's checked
against 0 and then (i_size - 1) can be negative.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>