Li Zefan 151a31b25e 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>
2011-10-20 18:10:35 +02:00
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