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Btrfs: use i_size_read() in btrfs_defrag_file()
authorLi Zefan <lizf@cn.fujitsu.com>
Fri, 2 Sep 2011 07:56:39 +0000 (15:56 +0800)
committerDavid Sterba <dsterba@suse.cz>
Thu, 20 Oct 2011 16:10:35 +0000 (18:10 +0200)
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>

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