#include "xcommon.h"
#include "fstab.h"
#include "nls.h"
-#include "conn.h"
#include "mount_constants.h"
+#include "nfs_mount.h"
#include "mount.h"
-#include "nfsumount.h"
+#include "error.h"
+#include "network.h"
+#include "parse_opt.h"
+#include "parse_dev.h"
+#include "utils.h"
+
+#define MOUNTSFILE "/proc/mounts"
+#define LINELEN (4096)
#if !defined(MNT_FORCE)
/* dare not try to include <linux/mount.h> -- lots of errors */
#endif
extern char *progname;
-extern int nfs_mount_version;
extern int nomtab;
extern int verbose;
int force;
int lazy;
int remount;
-extern int find_kernel_nfs_mount_version(void);
-extern int probe_mntport(clnt_addr_t *);
-extern int nfs_gethostbyname(const char *, struct sockaddr_in *);
-static inline enum clnt_stat
-nfs_umount(dirpath *argp, CLIENT *clnt)
+static int try_remount(const char *spec, const char *node)
{
- return clnt_call(clnt, MOUNTPROC_UMNT,
- (xdrproc_t) xdr_dirpath, (caddr_t)argp,
- (xdrproc_t) xdr_void, NULL,
- TIMEOUT);
-}
+ int res;
-int nfs_call_umount(clnt_addr_t *mnt_server, dirpath *argp)
-{
- CLIENT *clnt;
- enum clnt_stat res = 0;
- int msock;
-
- switch (mnt_server->pmap.pm_vers) {
- case 3:
- case 2:
- case 1:
- if (!probe_mntport(mnt_server))
- goto out_bad;
- clnt = mnt_openclnt(mnt_server, &msock);
- if (!clnt)
- goto out_bad;
- res = nfs_umount(argp, clnt);
- mnt_closeclnt(clnt, msock);
- if (res == RPC_SUCCESS)
- return 1;
- break;
- default:
- res = 1;
- break;
+ res = mount(spec, node, NULL,
+ MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
+ if (res == 0) {
+ struct mntent remnt;
+ nfs_error(_("%s: %s busy - remounted read-only"),
+ progname, spec);
+ remnt.mnt_type = remnt.mnt_fsname = NULL;
+ remnt.mnt_dir = xstrdup(node);
+ remnt.mnt_opts = xstrdup("ro");
+ if (!nomtab)
+ update_mtab(node, &remnt);
+ } else if (errno != EBUSY) { /* hmm ... */
+ perror(_("remount"));
+ nfs_error(_("%s: could not remount %s read-only"),
+ progname, spec);
}
- out_bad:
return res;
}
-/* complain about a failed umount */
-static void complain(int err, const char *dev) {
- switch (err) {
- case ENXIO:
- nfs_error (_("umount: %s: invalid block device"), dev); break;
- case EINVAL:
- nfs_error (_("umount: %s: not mounted"), dev); break;
- case EIO:
- nfs_error (_("umount: %s: can't write superblock"), dev); break;
- case EBUSY:
- /* Let us hope fstab has a line "proc /proc ..."
- and not "none /proc ..."*/
- nfs_error (_("umount: %s: device is busy"), dev); break;
- case ENOENT:
- nfs_error (_("umount: %s: not found"), dev); break;
- case EPERM:
- nfs_error (_("umount: %s: must be superuser to umount"), dev); break;
- case EACCES:
- nfs_error (_("umount: %s: block devices not permitted on fs"), dev); break;
- default:
- nfs_error (_("umount: %s: %s"), dev, strerror (err)); break;
- }
-}
-
-int del_mtab(const char *spec, const char *node)
+static int del_mtab(const char *spec, const char *node)
{
int umnt_err, res;
- umnt_err = 0;
- if (lazy) {
- res = umount2 (node, MNT_DETACH);
- if (res < 0)
- umnt_err = errno;
- goto writemtab;
- }
-
- if (force) {
- res = umount2 (node, MNT_FORCE);
- if (res == -1) {
- int errsv = errno;
- perror("umount2");
- errno = errsv;
- if (errno == ENOSYS) {
- if (verbose)
- printf(_("no umount2, trying umount...\n"));
- res = umount (node);
- }
- }
- } else
- res = umount (node);
-
- if (res < 0 && remount && errno == EBUSY && spec) {
- /* Umount failed - let us try a remount */
- res = mount(spec, node, NULL,
- MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
- if (res == 0) {
- struct mntent remnt;
- fprintf(stderr,
- _("umount: %s busy - remounted read-only\n"),
- spec);
- remnt.mnt_type = remnt.mnt_fsname = NULL;
- remnt.mnt_dir = xstrdup(node);
- remnt.mnt_opts = xstrdup("ro");
- if (!nomtab)
- update_mtab(node, &remnt);
- return 0;
- } else if (errno != EBUSY) { /* hmm ... */
- perror("remount");
- fprintf(stderr,
- _("umount: could not remount %s read-only\n"),
- spec);
- }
- }
-
- if (res >= 0) {
- /* Umount succeeded */
- if (verbose)
- printf (_("%s umounted\n"), spec ? spec : node);
- }
+ umnt_err = 0;
+ if (lazy) {
+ res = umount2 (node, MNT_DETACH);
+ if (res < 0)
+ umnt_err = errno;
+ goto writemtab;
+ }
+
+ if (force) {
+ res = umount2 (node, MNT_FORCE);
+ if (res == -1) {
+ int errsv = errno;
+ perror(_("umount2"));
+ errno = errsv;
+ if (errno == ENOSYS) {
+ if (verbose)
+ printf(_("no umount2, trying umount...\n"));
+ res = umount (node);
+ }
+ }
+ } else
+ res = umount (node);
+
+ if (res < 0) {
+ if (remount && errno == EBUSY && spec) {
+ res = try_remount(spec, node);
+ if (res)
+ goto writemtab;
+ return EX_SUCCESS;
+ } else
+ umnt_err = errno;
+ }
+
+ if (res >= 0) {
+ /* Umount succeeded */
+ if (verbose)
+ printf(_("%s umounted\n"), spec ? spec : node);
+ }
writemtab:
- if (!nomtab &&
- (umnt_err == 0 || umnt_err == EINVAL || umnt_err == ENOENT)) {
- update_mtab(node, NULL);
- }
+ if (!nomtab &&
+ (umnt_err == 0 || umnt_err == EINVAL || umnt_err == ENOENT)) {
+ update_mtab(node, NULL);
+ }
- if (res >= 0)
- return 0;
+ if (res >= 0)
+ return EX_SUCCESS;
- if (umnt_err)
- complain(umnt_err, node);
- return 1;
+ if (umnt_err)
+ umount_error(umnt_err, node);
+ return EX_FILEIO;
}
/*
- * Returns 1 if everything went well, else 0.
+ * Detect NFSv4 mounts.
+ *
+ * Consult /proc/mounts to determine if the mount point
+ * is an NFSv4 mount. The kernel is authoritative about
+ * what type of mount this is.
+ *
+ * Returns 1 if "mc" is an NFSv4 mount, zero if not, and
+ * -1 if some error occurred.
*/
-int _nfsumount(const char *spec, char *opts)
+static int nfs_umount_is_vers4(const struct mntentchn *mc)
{
- char *hostname;
- char *dirname;
- clnt_addr_t mnt_server = { &hostname, };
- struct mntent mnt = { .mnt_opts = opts };
- struct pmap *pmap = &mnt_server.pmap;
- char *p;
-
- nfs_mount_version = find_kernel_nfs_mount_version();
- if (spec == NULL || (p = strchr(spec,':')) == NULL)
- goto out_bad;
- hostname = xstrndup(spec, p-spec);
- dirname = xstrdup(p+1);
-#ifdef NFS_MOUNT_DEBUG
- printf(_("host: %s, directory: %s\n"), hostname, dirname);
-#endif
+ struct mntentchn *pmc;
+ struct mount_options *options;
+ int retval;
+
+ retval = -1;
+ pmc = getprocmntdirbackward(mc->m.mnt_dir, NULL);
+ if (!pmc)
+ goto not_found;
+
+ do {
+ size_t nlen = strlen(pmc->m.mnt_fsname);
+
+ /*
+ * It's possible the mount location string in /proc/mounts
+ * ends with a '/'. In this case, if the entry came from
+ * /etc/mtab, it won't have the trailing '/' so deal with
+ * it.
+ */
+ while (pmc->m.mnt_fsname[nlen - 1] == '/')
+ nlen--;
+ if (strncmp(pmc->m.mnt_fsname, mc->m.mnt_fsname, nlen) != 0)
+ continue;
+
+ if (strcmp(pmc->m.mnt_type, "nfs4") == 0)
+ goto out_nfs4;
+
+ options = po_split(pmc->m.mnt_opts);
+ if (options != NULL) {
+ unsigned long version;
+ int rc = nfs_nfs_version(options, &version);
+ po_destroy(options);
+ if (rc && version == 4)
+ goto out_nfs4;
+ }
- if (opts && (p = strstr(opts, "addr="))) {
- char *q;
+ if (strcmp(pmc->m.mnt_type, "nfs") == 0)
+ goto out_nfs;
+ } while ((pmc = getprocmntdirbackward(mc->m.mnt_dir, pmc)) != NULL);
- free(hostname);
- p += 5;
- q = p;
- while (*q && *q != ',') q++;
- hostname = xstrndup(p,q-p);
+ if (retval == -1) {
+not_found:
+ fprintf(stderr, "%s was not found in %s\n",
+ mc->m.mnt_dir, MOUNTSFILE);
+ goto out;
}
- if (opts && (p = strstr(opts, "mounthost="))) {
- char *q;
+out_nfs4:
+ if (verbose)
+ fprintf(stderr, "NFSv4 mount point detected\n");
+ retval = 1;
+ goto out;
- free(hostname);
- p += 10;
- q = p;
- while (*q && *q != ',') q++;
- hostname = xstrndup(p,q-p);
- }
+out_nfs:
+ if (verbose)
+ fprintf(stderr, "Legacy NFS mount point detected\n");
+ retval = 0;
- pmap->pm_prog = MOUNTPROG;
- pmap->pm_vers = MOUNTVERS_NFSV3;
- pmap->pm_prot = IPPROTO_TCP;
- if (opts && (p = strstr(opts, "mountprog=")) && isdigit(*(p+10)))
- pmap->pm_prog = atoi(p+10);
- if (opts && (p = strstr(opts, "mountport=")) && isdigit(*(p+10)))
- pmap->pm_port = atoi(p+10);
- if (opts && hasmntopt(&mnt, "v2"))
- pmap->pm_vers = nfsvers_to_mnt(2);
- if (opts && hasmntopt(&mnt, "v3"))
- pmap->pm_vers = nfsvers_to_mnt(3);
- if (opts && hasmntopt(&mnt, "v4"))
- pmap->pm_vers = nfsvers_to_mnt(4);
- if (opts && (p = strstr(opts, "vers=")) && isdigit(*(p+5)))
- pmap->pm_vers = nfsvers_to_mnt(atoi(p+5));
- if (opts && (p = strstr(opts, "mountvers=")) && isdigit(*(p+10)))
- pmap->pm_vers = atoi(p+10);
- if (opts && (hasmntopt(&mnt, "udp") || hasmntopt(&mnt, "proto=udp")))
- pmap->pm_prot = IPPROTO_UDP;
-
- if (!nfs_gethostbyname(hostname, &mnt_server.saddr))
- goto out_bad;
- return nfs_call_umount(&mnt_server, &dirname);
- out_bad:
- fprintf(stderr, "%s: %s: not found or not mounted\n", progname, spec);
- return 0;
+out:
+ return retval;
}
static struct option umount_longopts[] =
{ NULL, 0, 0, 0 }
};
-void umount_usage()
-{
- printf("usage: %s dir [-fvnrlh]\n", progname);
- printf("options:\n\t-f\t\tforce unmount\n");
- printf("\t-v\t\tverbose\n");
- printf("\t-n\t\tDo not update /etc/mtab\n");
- printf("\t-r\t\tremount\n");
- printf("\t-l\t\tlazy unmount\n");
- printf("\t-h\t\tprint this help\n\n");
-}
-
int nfsumount(int argc, char *argv[])
{
int c, ret;
char *spec;
struct mntentchn *mc;
+ if (argc < 2) {
+ umount_usage();
+ return EX_USAGE;
+ }
+
spec = argv[1];
argv += 1;
case 'h':
default:
umount_usage();
- return 0;
+ return EX_USAGE;
}
}
if (optind != argc) {
umount_usage();
- return 0;
+ return EX_USAGE;
}
if (spec == NULL || (*spec != '/' && strchr(spec,':') == NULL)) {
- printf(_("umount: %s: not found\n"), spec);
- return 0;
+ nfs_error(_("%s: %s: not found\n"), progname, spec);
+ return EX_USAGE;
}
if (*spec == '/')
if (mc && strcmp(mc->m.mnt_type, "nfs") != 0 &&
strcmp(mc->m.mnt_type, "nfs4") != 0) {
- fprintf(stderr, "umount.nfs: %s on %s it not an nfs filesystem\n",
- mc->m.mnt_fsname, mc->m.mnt_dir);
- exit(1);
+ nfs_error(_("%s: %s on %s is not an NFS filesystem"),
+ progname, mc->m.mnt_fsname, mc->m.mnt_dir);
+ return EX_USAGE;
}
if (getuid() != 0) {
/* umount might call us twice. The second time there will
* be no entry in mtab and we should just exit quietly
*/
- return 0;
+ return EX_SUCCESS;
only_root:
- fprintf(stderr,"%s: You are not permitted to unmount %s\n",
- progname, spec);
- return 0;
+ nfs_error(_("%s: You are not permitted to unmount %s"),
+ progname, spec);
+ return EX_USAGE;
}
if (hasmntopt(&mc->m, "users") == NULL) {
char *opt = hasmntopt(&mc->m, "user");
struct passwd *pw;
char *comma;
- int len;
+ size_t len;
if (!opt)
goto only_root;
if (opt[4] != '=')
}
}
- ret = 0;
+ ret = EX_SUCCESS;
if (mc) {
- if (!lazy)
- ret = _nfsumount(mc->m.mnt_fsname, mc->m.mnt_opts);
- if(ret)
- ret = del_mtab(mc->m.mnt_fsname, mc->m.mnt_dir);
+ if (!lazy) {
+ switch (nfs_umount_is_vers4(mc)) {
+ case 0:
+ /* We ignore the error from nfs_umount23.
+ * If the actual umount succeeds (in del_mtab),
+ * we don't want to signal an error, as that
+ * could cause /sbin/mount to retry!
+ */
+ nfs_umount23(mc->m.mnt_fsname, mc->m.mnt_opts);
+ break;
+ case 1:
+ break;
+ default:
+ return EX_FAIL;
+ }
+ }
+ ret = del_mtab(mc->m.mnt_fsname, mc->m.mnt_dir);
} else if (*spec != '/') {
if (!lazy)
- ret = _nfsumount(spec, "tcp,v3");
+ ret = nfs_umount23(spec, "tcp,v3");
} else
ret = del_mtab(NULL, spec);
- return(ret);
+ return ret;
}
-