introduce I_SYNC

I_LOCK was used for several unrelated purposes, which caused deadlock
situations in certain filesystems as a side effect.  One of the purposes
now uses the new I_SYNC bit.

Also document the various bits and change their order from historical to
logical.

[[email protected]: make fs/inode.c:wake_up_inode() static]
Signed-off-by: Joern Engel <[email protected]>
Cc: Dave Kleikamp <[email protected]>
Cc: David Chinner <[email protected]>
Cc: Anton Altaparmakov <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Adrian Bunk <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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