commit 2fd6b7f50797f2e993eea59e0a0b8c6399c811dc
author Nick Piggin <npiggin@kernel.dk> Fri Jan 07 17:49:34 2011 +1100
committer Nick Piggin <npiggin@kernel.dk> Fri Jan 07 17:50:21 2011 +1100
tree ce33b94b34844c09103836cf4cfa4364b742f217
parent da5029563a0a026c64821b09e8e7b4fd81d3fe1b

fs: dcache scale subdirs

Protect d_subdirs and d_child with d_lock, except in filesystems that aren't
using dcache_lock for these anyway (eg. using i_mutex).

Note: if we change the locking rule in future so that ->d_child protection is
provided only with ->d_parent->d_lock, it may allow us to reduce some locking.
But it would be an exception to an otherwise regular locking scheme, so we'd
have to see some good results. Probably not worthwhile.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>