Date: Thu, 28 Nov 2002 09:37:52 -0800 From: Maxime Henrion <mux@freebsd.org> To: Emiel Kollof <coolvibe@hackerheaven.org> Cc: Juli Mallett <jmallett@FreeBSD.ORG>, bde@FreeBSD.org, current@FreeBSD.ORG Subject: Re: ext2fs and NFS exporting wackyness Message-ID: <20021128173751.GI4067@elvis.mu.org> In-Reply-To: <20021128070218.GC43060@hackerheaven.org> References: <20021128064335.GA43060@hackerheaven.org> <20021127224634.A85112@FreeBSD.org> <20021128070218.GC43060@hackerheaven.org>
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Emiel Kollof wrote:
> * Juli Mallett (jmallett@FreeBSD.ORG) wrote:
>
> > > kernel: ext2fs doesn't support the old mount syscall
> > > mountd[344]: could not remount /storage: Operation not supported
> >
> > I have the same problem, more or less, with UFS :( I can no longer set up
> > an NFS server, but only started investigating/doing-this tonight.
>
>
> Hmm, that _is_ kinda shitty, Now I must unplug that disk and share it
> from somewhere else, because I kinda need that data on the network here.
>
> Can this be patched by doing some subtitutions in the files that use the
> "old" mount syscall? Or is it more hairy than that?
Can you try the attached patch and tell me if it works ?
Cheers,
Maxime
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Index: mountd.c
===================================================================
RCS file: /space2/ncvs/src/usr.sbin/mountd/mountd.c,v
retrieving revision 1.70
diff -u -p -r1.70 mountd.c
--- mountd.c 16 Oct 2002 16:04:50 -0000 1.70
+++ mountd.c 28 Nov 2002 17:35:24 -0000
@@ -211,6 +211,11 @@ int xdr_fhs(XDR *, caddr_t);
int xdr_mlist(XDR *, caddr_t);
void terminate(int);
+static char *nmount_fs[] = {
+ "ext2fs",
+ NULL
+};
+
struct exportlist *exphead;
struct mountlist *mlhead;
struct grouplist *grphead;
@@ -919,6 +924,8 @@ get_exportlist()
struct dirlist *dirhead;
struct statfs fsb, *fsp;
struct xucred anon;
+ struct iovec iov[6];
+ struct export_args ea;
char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp;
@@ -958,6 +965,31 @@ get_exportlist()
struct msdosfs_args da;
struct ntfs_args na;
} targs;
+ for (cp = *nmount_fs; cp != NULL; cp++) {
+ if (strcmp(cp, fsp->f_fstypename) == 0) {
+ ea.ex_flags = MNT_DELEXPORT;
+ iov[0].iov_base = "fstype";
+ iov[0].iov_len = strlen(iov[0].iov_base) + 1;
+ iov[1].iov_base = fsp->f_fstypename;
+ iov[1].iov_len = strlen(iov[1].iov_base) + 1;
+ iov[2].iov_base = "fspath";
+ iov[2].iov_len = strlen(iov[2].iov_base) + 1;
+ iov[3].iov_base = fsp->f_mntonname;
+ iov[3].iov_len = strlen(iov[3].iov_base) + 1;
+ iov[4].iov_base = "export";
+ iov[4].iov_len = strlen(iov[4].iov_base) + 1;
+ iov[5].iov_base = &ea;
+ iov[5].iov_len = strlen(iov[5].iov_base) + 1;
+ if ((nmount(iov, 6,
+ fsp->f_flags | MNT_UPDATE) < 0) &&
+ errno != ENOENT)
+ syslog(LOG_ERR,
+ "can't delete exports for %s: %m",
+ fsp->f_mntonname);
+ fsp++;
+ continue;
+ }
+ }
if (!strcmp(fsp->f_fstypename, "ufs") ||
!strcmp(fsp->f_fstypename, "msdosfs") ||
@@ -1745,9 +1777,10 @@ do_mount(ep, grp, exflags, anoncrp, dirp
{
struct statfs fsb1;
struct addrinfo *ai;
- struct export_args *eap;
+ struct export_args *eap, ea;
+ struct iovec iov[6];
char *cp = NULL;
- int done;
+ int done, do_nmount, error;
char savedc = '\0';
union {
struct ufs_args ua;
@@ -1760,6 +1793,15 @@ do_mount(ep, grp, exflags, anoncrp, dirp
/* XXX, we assume that all xx_args look like ufs_args. */
args.ua.fspec = 0;
eap = &args.ua.export;
+ do_nmount = 0;
+
+ for (cp = *nmount_fs; cp != NULL; cp++) {
+ if (strcmp(cp, fsb->f_fstypename) == 0) {
+ bzero(&ea, sizeof(ea));
+ eap = &ea;
+ do_nmount = 1;
+ }
+ }
eap->ex_flags = exflags;
eap->ex_anon = *anoncrp;
@@ -1784,10 +1826,10 @@ do_mount(ep, grp, exflags, anoncrp, dirp
goto skip;
eap->ex_addr =
(struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
- eap->ex_addrlen = args.ua.export.ex_addr->sa_len;
+ eap->ex_addrlen = eap->ex_addr->sa_len;
eap->ex_mask =
(struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
- eap->ex_masklen = args.ua.export.ex_mask->sa_len;
+ eap->ex_masklen = eap->ex_mask->sa_len;
break;
case GT_DEFAULT:
eap->ex_addr = NULL;
@@ -1812,8 +1854,26 @@ do_mount(ep, grp, exflags, anoncrp, dirp
* Also, needs to know how to export all types of local
* exportable filesystems and not just "ufs".
*/
- while (mount(fsb->f_fstypename, dirp,
- fsb->f_flags | MNT_UPDATE, (caddr_t)&args) < 0) {
+retry:
+ if (do_nmount) {
+ iov[0].iov_base = "fstype";
+ iov[0].iov_len = strlen(iov[0].iov_base) + 1;
+ iov[1].iov_base = fsb->f_fstypename;
+ iov[1].iov_len = strlen(iov[1].iov_base) + 1;
+ iov[2].iov_base = "fspath";
+ iov[2].iov_len = strlen(iov[2].iov_base) + 1;
+ iov[3].iov_base = dirp;
+ iov[3].iov_len = strlen(iov[3].iov_base) + 1;
+ iov[4].iov_base = "export";
+ iov[4].iov_len = strlen(iov[4].iov_base) + 1;
+ iov[5].iov_base = eap;
+ iov[5].iov_len = strlen(iov[5].iov_base) + 1;
+ error = nmount(iov, 6, fsb->f_flags | MNT_UPDATE);
+ } else {
+ error = mount(fsb->f_fstypename, dirp,
+ fsb->f_flags | MNT_UPDATE, &args);
+ }
+ if (error) {
if (cp)
*cp-- = savedc;
else
@@ -1859,6 +1919,7 @@ do_mount(ep, grp, exflags, anoncrp, dirp
syslog(LOG_ERR, "can't export %s", dirp);
return (1);
}
+ goto retry;
}
skip:
if (ai != NULL)
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