Commit [202ee5] Maximize Restore History

ext4: add a new spinlock i_raw_lock to protect the ext4's raw inode

To avoid potential data races, use a spinlock which protects the raw
(on-disk) inode.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>

Theodore Ts'o Theodore Ts'o 2014-04-21

changed fs/ext4/ext4.h
changed fs/ext4/inode.c
changed fs/ext4/super.c
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