commit 250df6ed274d767da844a5d9f05720b804240197
author Dave Chinner <dchinner@redhat.com> Tue Mar 22 22:23:36 2011 +1100
committer Al Viro <viro@zeniv.linux.org.uk> Thu Mar 24 21:16:31 2011 -0400
tree b74f49a86c4451d9e3e82f90e3f791163025be21
parent 3dc8fe4dca9cd3e4aa828ed36451e2bcfd2350da

fs: protect inode->i_state with inode->i_lock

Protect inode state transitions and validity checks with the
inode->i_lock. This enables us to make inode state transitions
independently of the inode_lock and is the first step to peeling
away the inode_lock from the code.

This requires that __iget() is done atomically with i_state checks
during list traversals so that we don't race with another thread
marking the inode I_FREEING between the state check and grabbing the
reference.

Also remove the unlock_new_inode() memory barrier optimisation
required to avoid taking the inode_lock when clearing I_NEW.
Simplify the code by simply taking the inode->i_lock around the
state change and wakeup. Because the wakeup is no longer tricky,
remove the wake_up_inode() function and open code the wakeup where
necessary.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>