From 99d48d545adcc46707f43d98599d352fe3c16792 Mon Sep 17 00:00:00 2001 From: steve Date: Sun, 24 Aug 1997 21:02:51 +0000 Subject: Try to avoid mounting filesystems multiple times. Also while I'm here do some -Wall cleaning. PR: kern/1839 Reviewed and corrected by: joerg --- sbin/mount_ifs/mount.c | 84 ++++++++++++++++++++++++++++++++++++++++---------- 1 file changed, 67 insertions(+), 17 deletions(-) (limited to 'sbin/mount_ifs/mount.c') diff --git a/sbin/mount_ifs/mount.c b/sbin/mount_ifs/mount.c index b0d0105..bc1c8f4 100644 --- a/sbin/mount_ifs/mount.c +++ b/sbin/mount_ifs/mount.c @@ -1,4 +1,4 @@ -/* +/*- * Copyright (c) 1980, 1989, 1993, 1994 * The Regents of the University of California. All rights reserved. * @@ -32,13 +32,18 @@ */ #ifndef lint -static char copyright[] = +static const char copyright[] = "@(#) Copyright (c) 1980, 1989, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint +#if 0 static char sccsid[] = "@(#)mount.c 8.25 (Berkeley) 5/8/95"; +#else +static const char rcsid[] = + "$Id$"; +#endif #endif /* not lint */ #include @@ -56,17 +61,17 @@ static char sccsid[] = "@(#)mount.c 8.25 (Berkeley) 5/8/95"; #include #include +#include "extern.h" #include "pathnames.h" int debug, fstab_style, verbose; -int checkvfsname __P((const char *, const char **)); char *catopt __P((char *, const char *)); struct statfs *getmntpt __P((const char *)); int hasopt __P((const char *, const char *)); -const char - **makevfslist __P((char *)); +int ismounted __P((struct fstab *, struct statfs *, int)); +int isremountable __P((const char *)); void mangle __P((char *, int *, const char **)); int mountfs __P((const char *, const char *, const char *, int, const char *, const char *)); @@ -74,9 +79,6 @@ void prmount __P((struct statfs *)); void putfsent __P((const struct statfs *)); void usage __P((void)); -/* From mount_ufs.c. */ -int mount_ufs __P((int, char * const *)); - /* Map from mount otions to printable formats. */ static struct opt { int o_opt; @@ -96,6 +98,17 @@ static struct opt { { NULL } }; +/* + * List of VFS types that can be remounted without becoming mounted on top + * of each other. + * XXX Is this list correct? + */ +static const char * +remountable_fs_names[] = { + "ufs", "ffs", "lfs", "ext2fs", + 0 +}; + int main(argc, argv) int argc; @@ -165,7 +178,9 @@ main(argc, argv) rval = 0; switch (argc) { case 0: - if (all) + if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) + err(1, "getmntinfo"); + if (all) { while ((fs = getfsent()) != NULL) { if (BADTYPE(fs->fs_type)) continue; @@ -173,22 +188,20 @@ main(argc, argv) continue; if (hasopt(fs->fs_mntops, "noauto")) continue; + if (ismounted(fs, mntbuf, mntsize)) + continue; if (mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, init_flags, options, fs->fs_mntops)) rval = 1; } - else if (fstab_style) { - if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) - err(1, "getmntinfo"); + } else if (fstab_style) { for (i = 0; i < mntsize; i++) { if (checkvfsname(mntbuf[i].f_fstypename, vfslist)) continue; putfsent(&mntbuf[i]); } } else { - if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) - err(1, "getmntinfo"); for (i = 0; i < mntsize; i++) { if (checkvfsname(mntbuf[i].f_fstypename, vfslist)) @@ -246,7 +259,7 @@ main(argc, argv) */ if (rval == 0 && getuid() == 0 && (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { - if (fscanf(mountdfp, "%ld", &pid) == 1 && + if (fscanf(mountdfp, "%d", &pid) == 1 && pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) err(1, "signal mountd"); (void)fclose(mountdfp); @@ -256,6 +269,38 @@ main(argc, argv) } int +ismounted(fs, mntbuf, mntsize) + struct fstab *fs; + struct statfs *mntbuf; + int mntsize; +{ + int i; + + if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0') + /* the root file system can always be remounted */ + return (0); + + for (i = mntsize - 1; i >= 0; --i) + if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 && + (!isremountable(fs->fs_vfstype) || + strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0)) + return (1); + return (0); +} + +int +isremountable(vfsname) + const char *vfsname; +{ + const char **cp; + + for (cp = remountable_fs_names; *cp; cp++) + if (strcmp(*cp, vfsname) == 0) + return (1); + return (0); +} + +int hasopt(mntopts, option) const char *mntopts, *option; { @@ -298,6 +343,11 @@ mountfs(vfstype, spec, name, flags, options, mntopts) int argc, i, status; char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN]; +#if __GNUC__ + (void)&optbuf; + (void)&name; +#endif + if (realpath(name, mntpath) != NULL && stat(mntpath, &sb) == 0) { if (!S_ISDIR(sb.st_mode)) { warnx("%s: Not a directory", mntpath); @@ -546,9 +596,9 @@ putfsent(ent) if (ent->f_flags & MNT_NOATIME) printf(",noatime"); - if (fst = getfsspec(ent->f_mntfromname)) + if ((fst = getfsspec(ent->f_mntfromname))) printf("\t%u %u\n", fst->fs_freq, fst->fs_passno); - else if (fst = getfsfile(ent->f_mntonname)) + else if ((fst = getfsfile(ent->f_mntonname))) printf("\t%u %u\n", fst->fs_freq, fst->fs_passno); else if (ent->f_type == MOUNT_UFS) printf("\t1 1\n"); -- cgit v1.1