Basic compilation of the bulk of zfs_znode.c has been enabled. After
much consideration it was decided to convert the existing vnode based
interfaces to more friendly Linux interfaces. The following commits
will systematically replace update the requiter interfaces. There
are of course pros and cons to this decision.
Pros:
* This simplifies intergration with Linux in the long term. There is
no longer any need to manage vnodes which are a foreign concept to
the Linux VFS.
* Improved long term maintainability.
* Minor performance improvements by removing vnode overhead.
Cons:
* Added work in the short term to modify multiple ZFS interfaces.
* Harder to pull in changes if we ever see any new code from Solaris.
* Mixed Solaris and Linux interfaces in some ZFS code.
Certain NFS/SMB share functionality is not yet in place. These
functions used to be wrapped with the generic HAVE_ZPL to prevent
them from being compiled. I still don't want them compiled but
I'm working toward eliminating the use of HAVE_ZPL. So I'm just
renaming the wrapper here to HAVE_SHARE. They still won't be
compiled until all the share issues are worked through. Share
support is the last missing piece from zfs_ioctl.c.
Unlike Solaris the Linux implementation embeds the inode in the
znode, and has no use for a vnode. So while it's true that fragmention
of the znode cache may occur it should not be worse than any of the
other Linux FS inode caches. Until proven that this is a problem it's
just added complexity we don't need.
These compiler warnings were introduced when code which was
previously #ifdef'ed out by HAVE_ZPL was re-added for use
by the posix layer. All of the following changes should be
obviously correct and will cause no semantic changes.
Fix non-c90 compliant code, for the most part these changes
simply deal with where a particular variable is declared.
Under c90 it must alway be done at the very start of a block.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
