Hi,
Upgrading the nfs-utils package from 2.3.4 to 2.4.1 on my nas device
running Arch Linux ARM (alarm) broke the nfs server functionality.
On all of my clients, mount fails with a "Stale file handle" error. On the
server, I get this (side note: the reported version number is wrong):
Jul 08 10:28:50 nas rpc.mountd[19752]: Version 2.3.4 starting
Jul 08 10:30:08 nas rpc.mountd[19752]: auth_unix_ip: inbuf 'nfsd <redacted valid ipv6 address>'
Jul 08 10:30:08 nas rpc.mountd[19752]: auth_unix_ip: client 0x492c50 'zero.local'
Jul 08 10:30:08 nas rpc.mountd[19752]: nfsd_fh: inbuf 'zero.local 1 \x00000000'
Jul 08 10:30:08 nas rpc.mountd[19752]: nfsd_fh: found 0x49b698 path /srv/nfs
Jul 08 10:30:08 nas rpc.mountd[19752]: nfsd_export: inbuf 'zero.local /srv/nfs/tmp2'
Jul 08 10:30:09 nas rpc.mountd[19752]: nfsd_export: found 0x499ed0 path /srv/nfs/tmp2
Jul 08 10:30:09 nas rpc.mountd[19752]: nfsd_fh: inbuf 'zero.local 7 \x0100140000000000ae18d6965c0a40f78701c770897a4fc>
Jul 08 10:30:09 nas rpc.mountd[19752]: nfsd_fh: found (nil) path (null)
Analysis:
Consider this code snippet from utils/mountd/cache.c:
627 static bool match_fsid(struct parsed_fsid *parsed, nfs_export *exp, char *path)
628 {
629 struct stat stb;
630 int type;
631 char u[16];
632
633 if (nfsd_path_stat(path, &stb) != 0)
634 return false;
Variable stb gets defined, then gets filled by nfs_path_stat(), which is
implemented in support/misc/nfsd_path.c. At least on alarm, definition of
struct stat in stat.h depends on __USE_FILE_OFFSET64, which comes from
config.h if defined. This requires config.h to be included before stat.h.
The include order is right in cache.c, however, it's reversed in
nfsd_path.c. This causes the data returned by nfs_path_stat() to be in a
different structure than expected, and that's what eventually causes the
error.
Proposed solution:
The following patch fixes those occurrences where the include order
between config.h and stat.h is wrong, by moving config.h to the top.
Regards,
Zoltan Karcagi
