Date: Sat, 24 Mar 2001 14:15:39 -0800 From: Dima Dorfman <dima@unixfreak.org> To: Gerald Pfeifer <pfeifer@dbai.tuwien.ac.at> Cc: freebsd-hackers@freebsd.org, freebsd-fs@freebsd.org Subject: Re: Displaying options for current NFS mounts Message-ID: <20010324221539.A025A3E09@bazooka.unixfreak.org> In-Reply-To: <Pine.BSF.4.33.0103240909260.9037-100000@deneb.dbai.tuwien.ac.at>; from pfeifer@dbai.tuwien.ac.at on "Sat, 24 Mar 2001 09:17:12 %2B0100 (CET)"
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Gerald Pfeifer <pfeifer@dbai.tuwien.ac.at> writes:
> What I'd like to see is `mount -v' printing
>
> vexpert:/files5 on /.amd_mnt/vexpert/files5 (nfs: v3, udp)
> ^^^^^^^^^^^^
> instead of
>
> vexpert:/files5 on /.amd_mnt/vexpert/files5 (nfs)
> ^^^
> This kind of information is incredibly useful for debugging, yet I
> haven't found ANY way to obtain it, let alone such a natural one.
IIRC tcpdump can detect NFS3 vs. NFS2, but that's suboptimal.
Implementing the above functionality in mount(8) isn't actually that
hard. We would need to export the filesystem-specific <fs>_args
structures (e.g., nfs_args, ffs_args) to the userland. If we do that,
mount(8) will be able to display all kinds of interesting,
filesystem-specific stuff (e.g., NFS version and transport, whether a
mounted CDROM is using Joilet, etc.).
I tried to export this stuff in struct statfs, but ran into a problem:
I'd need the complete definitions of <fs>_args in <sys/mount.h>, but I
can't include, e.g., <nfs/nfs.h> because the latter includes the
former (<sys/mount.h>)!
The patch below kind of implements this functionality. I only export
nfs_args (not <otherfs>_args), and I only modified mount(8) to print
the NFS version, but printing the transport and others is simple from
there. To work around the above problem, I pasted the struct nfs_args
definition into mount.h. It is *horribly* ugly, but it does work.
If some other people display intrest in this, and someone can suggest
a less ugly way of getting the definitions of <fs>_args into mount.h
(the only other way I can think of is to just move all of them from
<fs>/<fs>.h to mount.h permamently), I'll implement this stuff in the
other filesystems.
Regards
Dima Dorfman
dima@unixfreak.org
P.S. If you want to try the patch, you'll need to rebuild at least
the kernel, libc, mount, mountd, and amd, since the size of struct
statfs changes. I only did those, and it seems to work on my system.
Index: sys/sys/mount.h
===================================================================
RCS file: /st/src/FreeBSD/src/sys/sys/mount.h,v
retrieving revision 1.102
diff -u -r1.102 mount.h
--- sys/sys/mount.h 2001/03/01 20:59:59 1.102
+++ sys/sys/mount.h 2001/03/24 22:03:13
@@ -69,6 +69,44 @@
#define MNAMELEN 72 /* length of buffer for returned name */
#endif
+/* XXXDD: from src/sys/nfs/nfs.h! fixme! */
+/*
+ * Arguments to mount NFS
+ */
+#ifndef NFS_ARGS_DEFINED
+#define NFS_ARGS_DEFINED
+#define NFS_ARGSVERSION 3 /* change when nfs_args changes */
+struct nfs_args {
+ int version; /* args structure version number */
+ struct sockaddr *addr; /* file server address */
+ int addrlen; /* length of address */
+ int sotype; /* Socket type */
+ int proto; /* and Protocol */
+ u_char *fh; /* File handle to be mounted */
+ int fhsize; /* Size, in bytes, of fh */
+ int flags; /* flags */
+ int wsize; /* write size in bytes */
+ int rsize; /* read size in bytes */
+ int readdirsize; /* readdir size in bytes */
+ int timeo; /* initial timeout in .1 secs */
+ int retrans; /* times to retry send */
+ int maxgrouplist; /* Max. size of group list */
+ int readahead; /* # of blocks to readahead */
+ int leaseterm; /* Term (sec) of lease */
+ int deadthresh; /* Retrans threshold */
+ char *hostname; /* server's name */
+ int acregmin; /* cache attrs for reg files min time */
+ int acregmax; /* cache attrs for reg files max time */
+ int acdirmin; /* cache attrs for dirs min time */
+ int acdirmax; /* cache attrs for dirs max time */
+};
+#endif /* !NFS_ARGS_DEFINED */
+
+/* filesystem-specific mount options */
+union mount_info {
+ struct nfs_args nfs;
+};
+
struct statfs {
long f_spare2; /* placeholder */
long f_bsize; /* fundamental file system block size */
@@ -92,6 +130,7 @@
char f_mntfromname[MNAMELEN];/* mounted filesystem */
short f_spares2; /* unused spare */
long f_spare[2]; /* unused spare */
+ union mount_info f_mtinfo; /* filesystem-specific mount info */
};
#ifdef _KERNEL
Index: sys/nfs/nfs.h
===================================================================
RCS file: /st/src/FreeBSD/src/sys/nfs/nfs.h,v
retrieving revision 1.57
diff -u -r1.57 nfs.h
--- sys/nfs/nfs.h 2001/02/18 13:30:19 1.57
+++ sys/nfs/nfs.h 2001/03/24 22:03:13
@@ -116,6 +116,8 @@
/*
* Arguments to mount NFS
*/
+#ifndef NFS_ARGS_DEFINED
+#define NFS_ARGS_DEFINED
#define NFS_ARGSVERSION 3 /* change when nfs_args changes */
struct nfs_args {
int version; /* args structure version number */
@@ -141,6 +143,7 @@
int acdirmin; /* cache attrs for dirs min time */
int acdirmax; /* cache attrs for dirs max time */
};
+#endif /* !NFS_ARGS_DEFINED */
/*
* NFS mount option flags
Index: sys/nfs/nfs_vfsops.c
===================================================================
RCS file: /st/src/FreeBSD/src/sys/nfs/nfs_vfsops.c,v
retrieving revision 1.94
diff -u -r1.94 nfs_vfsops.c
--- sys/nfs/nfs_vfsops.c 2001/03/01 20:59:19 1.94
+++ sys/nfs/nfs_vfsops.c 2001/03/24 22:03:14
@@ -307,6 +307,9 @@
sbp->f_type = mp->mnt_vfc->vfc_typenum;
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
+ bcopy((caddr_t)&mp->mnt_stat.f_mtinfo.nfs,
+ (caddr_t)&sbp->f_mtinfo.nfs,
+ sizeof(mp->mnt_stat.f_mtinfo.nfs));
}
nfsm_reqdone;
vput(vp);
@@ -892,6 +895,7 @@
bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN);
+ bcopy(argp, &mp->mnt_stat.f_mtinfo.nfs, sizeof(*argp));
nmp->nm_nam = nam;
/* Set up the sockets and per-host congestion */
nmp->nm_sotype = argp->sotype;
Index: sbin/mount/mount.c
===================================================================
RCS file: /st/src/FreeBSD/src/sbin/mount/mount.c,v
retrieving revision 1.41
diff -u -r1.41 mount.c
--- sbin/mount/mount.c 2000/11/22 17:54:56 1.41
+++ sbin/mount/mount.c 2001/03/24 22:03:14
@@ -50,6 +50,9 @@
#include <sys/stat.h>
#include <sys/wait.h>
+#include <nfs/rpcv2.h>
+#include <nfs/nfs.h>
+
#include <err.h>
#include <errno.h>
#include <fstab.h>
@@ -530,6 +533,20 @@
(void)printf(", reads: sync %ld async %ld",
sfp->f_syncreads, sfp->f_asyncreads);
}
+
+ /*
+ * File-system specific options.
+ */
+ if (strcmp(sfp->f_fstypename, "nfs") == 0) {
+ struct nfs_args *nfsa = &sfp->f_mtinfo.nfs;
+
+ if (nfsa->version != NFS_ARGSVERSION) {
+ (void)printf("\n");
+ errx(1, "nfs_args version mismatch");
+ }
+ (void)printf(", %s",
+ (nfsa->flags & NFSMNT_NFSV3) ? "v3" : "v2");
+ }
(void)printf(")\n");
}
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