linux/fs/nfsd
David Howells afefdbb28a [PATCH] VFS: Make filldir_t and struct kstat deal in 64-bit inode numbers
These patches make the kernel pass 64-bit inode numbers internally when
communicating to userspace, even on a 32-bit system.  They are required
because some filesystems have intrinsic 64-bit inode numbers: NFS3+ and XFS
for example.  The 64-bit inode numbers are then propagated to userspace
automatically where the arch supports it.

Problems have been seen with userspace (eg: ld.so) using the 64-bit inode
number returned by stat64() or getdents64() to differentiate files, and
failing because the 64-bit inode number space was compressed to 32-bits, and
so overlaps occur.

This patch:

Make filldir_t take a 64-bit inode number and struct kstat carry a 64-bit
inode number so that 64-bit inode numbers can be passed back to userspace.

The stat functions then returns the full 64-bit inode number where
available and where possible.  If it is not possible to represent the inode
number supplied by the filesystem in the field provided by userspace, then
error EOVERFLOW will be issued.

Similarly, the getdents/readdir functions now pass the full 64-bit inode
number to userspace where possible, returning EOVERFLOW instead when a
directory entry is encountered that can't be properly represented.

Note that this means that some inodes will not be stat'able on a 32-bit
system with old libraries where they were before - but it does mean that
there will be no ambiguity over what a 32-bit inode number refers to.

Note similarly that directory scans may be cut short with an error on a
32-bit system with old libraries where the scan would work before for the
same reasons.

It is judged unlikely that this situation will occur because modern glibc
uses 64-bit capable versions of stat and getdents class functions
exclusively, and that older systems are unlikely to encounter
unrepresentable inode numbers anyway.

[akpm: alpha build fix]
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-03 08:03:40 -07:00
..
auth.c [PATCH] knfsd: nfsd: nfsd_setuser doesn't really need to modify rqstp->rq_cred. 2006-04-11 06:18:52 -07:00
export.c [PATCH] nfsd: add lock annotations to e_start and e_stop 2006-10-02 07:57:18 -07:00
lockd.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Makefile [PATCH] knfsd: nfsd4: reboot hash 2005-06-24 00:06:33 -07:00
nfs2acl.c [PATCH] nfsd: check for read-only exports before setting acls 2005-12-20 10:31:33 -08:00
nfs3acl.c [PATCH] nfsd: check for read-only exports before setting acls 2005-12-20 10:31:33 -08:00
nfs3proc.c [PATCH] knfsd: Correct reserved reply space for read requests. 2006-04-11 06:18:51 -07:00
nfs3xdr.c [PATCH] knfsd: check error status from vfs_getattr and i_op->fsync 2006-01-06 08:33:59 -08:00
nfs4acl.c [PATCH] knfsd: nfsd4: better nfs4acl errors 2006-04-11 06:18:51 -07:00
nfs4callback.c [PATCH] knfsd: add some missing newlines in printks 2006-10-02 07:57:17 -07:00
nfs4idmap.c [PATCH] fs: Conversions from kmalloc+memset to k(z|c)alloc 2006-09-27 08:26:10 -07:00
nfs4proc.c [PATCH] knfsd: add some missing newlines in printks 2006-10-02 07:57:17 -07:00
nfs4recover.c [PATCH] VFS: Make filldir_t and struct kstat deal in 64-bit inode numbers 2006-10-03 08:03:40 -07:00
nfs4state.c [PATCH] Really ignore kmem_cache_destroy return value 2006-09-27 08:26:10 -07:00
nfs4xdr.c [PATCH] VFS: Permit filesystem to perform statfs with a known root dentry 2006-06-23 07:42:45 -07:00
nfscache.c [PATCH] fs: use list_move() 2006-06-26 09:58:18 -07:00
nfsctl.c [PATCH] knfsd: allow admin to set nthreads per node 2006-10-02 07:57:20 -07:00
nfsfh.c [PATCH] knfsd: Fix stale file handle problem with subtree_checking. 2006-07-31 13:28:37 -07:00
nfsproc.c [PATCH] knfsd: Correct reserved reply space for read requests. 2006-04-11 06:18:51 -07:00
nfssvc.c [PATCH] knfsd: allow admin to set nthreads per node 2006-10-02 07:57:20 -07:00
nfsxdr.c [PATCH] Unlinline a bunch of other functions 2006-01-14 18:27:06 -08:00
stats.c [PATCH] knfsd: nfsd4: add per-operation server stats 2006-07-10 13:24:27 -07:00
vfs.c [PATCH] nfsd: lockdep annotation 2006-10-02 07:57:20 -07:00