commit 7fcc99f4f2ddb1c39abc05fbb9b32f05b03c7f8f
author Christoph Hellwig <hch@tuxera.com> Fri Oct 01 05:46:31 2010 +0200
committer Christoph Hellwig <hch@lst.de> Fri Oct 01 05:46:31 2010 +0200
tree b07045981f17d855f89f1ef59579e330d8ffce20
parent 89755dcace09b44b3aa024bf302d9b19b4c24cad

hfsplus: add missing extent locking in hfsplus_write_inode

Most of the extent handling code already does proper SMP locking, but
hfsplus_write_inode was calling into hfsplus_ext_write_extent without
taking the extents_lock.  Fix this by splitting hfsplus_ext_write_extent
into an internal helper that expects the lock, and a public interface
that first acquires it.

Also add a few locking asserts and document the locking rules in
hfsplus_fs.h.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>