git: hammer2 - serialized flush work part 3
dillon at crater.dragonflybsd.org
Thu Jan 31 16:28:58 PST 2013
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date: Thu Jan 31 16:03:59 2013 -0800
hammer2 - serialized flush work part 3
* Clean up hammer2_inode vs hammer2_chain. Remove chain->u.ip (the
backpointer from the chain to the inode), which simplifies a lot
of things. This was only used to detect when a vnode might have to
be recycled but we solve that a different way by adjusting the
kernel's cache_unlink() code.
* Revamp hammer2_inode_get(). This routine now always kmalloc()'s a new
hammer2_inode. In HAMMER2, the hammer2_inode structure is actually
an indirect pointer to an underlying chain so it does not have to be
unique. There can multiple ip's pointing to the same chain.
* Revamp hammer2_inode_put(). The ref on ip->chain is dropped via ip->chain,
and the (passed_chain) argument is treated separately and does not
necessarily have to match ip->chain. This makes hammer2_inode_put()'s API
comparable to hammer2_inode_unlock_ex(), reducing confusion.
* Depend on adjustments to cache_unlink() and cache_rename() to detect
vnodes which should be recycled. This code (in the proper kernel, not
here) now triggers a deactivation if the vnode related to the namecache
entry has no refs, allowing HAMMER2 to detect any deletions and vrecycle()
the vnode immediately.
* Numerous ref/lock fixes.
Summary of changes:
sys/vfs/hammer2/hammer2.h | 16 ++--
sys/vfs/hammer2/hammer2_chain.c | 54 +----------
sys/vfs/hammer2/hammer2_inode.c | 191 ++++++++++++++++++++-------------------
sys/vfs/hammer2/hammer2_ioctl.c | 6 +-
sys/vfs/hammer2/hammer2_subr.c | 8 ++
sys/vfs/hammer2/hammer2_vfsops.c | 14 ++-
sys/vfs/hammer2/hammer2_vnops.c | 53 ++++++++---
7 files changed, 165 insertions(+), 177 deletions(-)
DragonFly BSD source repository
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