RFC: patch to make d_fileno 64bits
gleb at freebsd.org
Fri Nov 21 18:21:18 UTC 2014
On (21/11/2014 10:25), John Baldwin wrote:
> On Thursday, November 20, 2014 10:19:14 PM Rick Macklem wrote:
> > The attached patch covers the basics of a way to
> > convert the d_fileno field of "struct dirent" to
> > 64bits. This patch is incomplete and won't even
> > build, but I thought I'd post it in case anyone
> > wanted to take a look and comment on the approach
> > it uses.
> > - renames the old/current one "struct dirent32"
> > - changes d_fileno to 64bits and adds a 64bit
> > d_off field for the offset of the underlying
> > file system
> > - defines a new VOP_READDIR() that will return
> > the new "struct dirent" that is used as the
> > default one for a new getdirentries(2).
> > - the old/current getdirentries(2) uses the old
> > VOP_READDIR32() by default.
> > For the case of a file system that supports both
> > the new and old VOP_READDIR(), they are used by
> > the corresponding new and old getdirentries(2)
> > syscalls.
> > For a file system that only supports one of
> > the VOP_READDIR()s, the "struct dirent32"
> > is copied to "struct dirent" (or vice versa).
> > At this point, all file systems would support
> > the old VOP_READDIR() and I think the new
> > VOP_READDIR() can easily be added for NFS,
> > ZFS. (OpenBSD already has UFS code for
> > essentially a new struct dirent and hopefully
> > that code could be ported easily, too.)
> > Anyhow, any comments on this approach? rick
> I think this is already done (along with several other changes) more fully in
> the projects/ino64 branch in svn?
projects/ino64 was created by mdf for merging GSoC commits, and it
didn't even get half way through.
I'm currently working on merging the code to CURRENT. It's been more
than 2 years, so there is quite some work in there. I intend to update
the branch as soon as code is ready for review.
Besides branch also changes dev_t to 64-bit, bumps MNAMELEN to 1024 and
has complete ABI compatibility shims (probably except openaudit which had
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