Some formatting updates (ran the code through indent)
-Erik
This commit is contained in:
Erik Andersen
@ -1,3 +1,4 @@
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/* vi: set sw=4 ts=4: */
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/*
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* Mini mount implementation for busybox
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*
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@ -55,357 +56,371 @@
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static int use_loop = 0;
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#endif
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extern const char mtab_file[]; /* Defined in utility.c */
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extern const char mtab_file[]; /* Defined in utility.c */
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static const char mount_usage[] = "\tmount [flags]\n"
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"\tmount [flags] device directory [-o options,more-options]\n"
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"\n"
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"Flags:\n"
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"\t-a:\tMount all file systems in fstab.\n"
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"\tmount [flags] device directory [-o options,more-options]\n"
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"\n" "Flags:\n" "\t-a:\tMount all file systems in fstab.\n"
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#ifdef BB_MTAB
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"\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
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"\t-n:\tDon't write a mount table entry.\n"
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"\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
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"\t-n:\tDon't write a mount table entry.\n"
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#endif
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"\t-o option:\tOne of many filesystem options, listed below.\n"
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"\t-r:\tMount the filesystem read-only.\n"
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"\t-t filesystem-type:\tSpecify the filesystem type.\n"
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"\t-w:\tMount for reading and writing (default).\n"
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"\n"
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"Options for use with the \"-o\" flag:\n"
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"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
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"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
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"\texec / noexec:\tAllow use of executable files / disallow them.\n"
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"\t-o option:\tOne of many filesystem options, listed below.\n"
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"\t-r:\tMount the filesystem read-only.\n"
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"\t-t filesystem-type:\tSpecify the filesystem type.\n"
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"\t-w:\tMount for reading and writing (default).\n"
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"\n"
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"Options for use with the \"-o\" flag:\n"
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"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
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"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
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"\texec / noexec:\tAllow use of executable files / disallow them.\n"
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#if defined BB_FEATURE_MOUNT_LOOP
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"\tloop: Mounts a file via loop device.\n"
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"\tloop: Mounts a file via loop device.\n"
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#endif
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"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
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"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
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"\tro / rw: Mount for read-only / read-write.\n"
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"\t"
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"There are EVEN MORE flags that are specific to each filesystem.\n"
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"You'll have to see the written documentation for those.\n";
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"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
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"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
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"\tro / rw: Mount for read-only / read-write.\n"
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"\t"
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"There are EVEN MORE flags that are specific to each filesystem.\n"
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"You'll have to see the written documentation for those.\n";
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struct mount_options {
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const char *name;
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unsigned long and;
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unsigned long or;
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const char *name;
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unsigned long and;
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unsigned long or;
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};
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static const struct mount_options mount_options[] = {
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{"async", ~MS_SYNCHRONOUS, 0},
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{"defaults", ~0, 0},
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{"dev", ~MS_NODEV, 0},
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{"exec", ~MS_NOEXEC, 0},
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{"nodev", ~0, MS_NODEV},
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{"noexec", ~0, MS_NOEXEC},
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{"nosuid", ~0, MS_NOSUID},
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{"remount", ~0, MS_REMOUNT},
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{"ro", ~0, MS_RDONLY},
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{"rw", ~MS_RDONLY, 0},
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{"suid", ~MS_NOSUID, 0},
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{"sync", ~0, MS_SYNCHRONOUS},
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{0, 0, 0}
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{"async", ~MS_SYNCHRONOUS, 0},
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{"defaults", ~0, 0},
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{"dev", ~MS_NODEV, 0},
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{"exec", ~MS_NOEXEC, 0},
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{"nodev", ~0, MS_NODEV},
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{"noexec", ~0, MS_NOEXEC},
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{"nosuid", ~0, MS_NOSUID},
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{"remount", ~0, MS_REMOUNT},
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{"ro", ~0, MS_RDONLY},
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{"rw", ~MS_RDONLY, 0},
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{"suid", ~MS_NOSUID, 0},
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{"sync", ~0, MS_SYNCHRONOUS},
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{0, 0, 0}
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};
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static int
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do_mount(char* specialfile, char* dir, char* filesystemtype,
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long flags, void* string_flags, int useMtab, int fakeIt, char* mtab_opts)
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do_mount(char *specialfile, char *dir, char *filesystemtype,
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long flags, void *string_flags, int useMtab, int fakeIt,
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char *mtab_opts)
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{
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int status=0;
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int status = 0;
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#if defined BB_MTAB
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if (fakeIt==FALSE)
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if (fakeIt == FALSE)
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#endif
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{
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{
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#if defined BB_FEATURE_MOUNT_LOOP
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if (use_loop) {
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int loro = flags & MS_RDONLY;
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char *lofile = specialfile;
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specialfile = find_unused_loop_device();
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if (specialfile == NULL) {
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fprintf(stderr, "Could not find a spare loop device\n");
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return( FALSE);
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}
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if (set_loop (specialfile, lofile, 0, &loro)) {
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fprintf(stderr, "Could not setup loop device\n");
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return( FALSE);
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}
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if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
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fprintf(stderr, "WARNING: loop device is read-only\n");
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flags &= ~MS_RDONLY;
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}
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}
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if (use_loop) {
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int loro = flags & MS_RDONLY;
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char *lofile = specialfile;
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specialfile = find_unused_loop_device();
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if (specialfile == NULL) {
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fprintf(stderr, "Could not find a spare loop device\n");
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return (FALSE);
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}
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if (set_loop(specialfile, lofile, 0, &loro)) {
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fprintf(stderr, "Could not setup loop device\n");
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return (FALSE);
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}
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if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
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fprintf(stderr, "WARNING: loop device is read-only\n");
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flags &= ~MS_RDONLY;
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}
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}
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#endif
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status=mount(specialfile, dir, filesystemtype, flags, string_flags);
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}
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status =
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mount(specialfile, dir, filesystemtype, flags, string_flags);
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}
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/* If the mount was sucessful, do anything needed, then return TRUE */
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if (status == 0) {
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/* If the mount was sucessful, do anything needed, then return TRUE */
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if (status == 0) {
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#if defined BB_MTAB
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if (useMtab==TRUE) {
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write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
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if (useMtab == TRUE) {
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write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
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}
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#endif
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return (TRUE);
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}
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/* Bummer. mount failed. Clean up */
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#if defined BB_FEATURE_MOUNT_LOOP
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if (specialfile != NULL) {
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del_loop(specialfile);
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}
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#endif
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return( TRUE);
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}
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/* Bummer. mount failed. Clean up */
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#if defined BB_FEATURE_MOUNT_LOOP
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if (specialfile != NULL) {
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del_loop(specialfile);
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}
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#endif
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return( FALSE);
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return (FALSE);
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}
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#if defined BB_MTAB
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#define whine_if_fstab_is_missing() {}
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#define whine_if_fstab_is_missing() {}
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#else
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extern void whine_if_fstab_is_missing()
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{
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struct stat statBuf;
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if (stat("/etc/fstab", &statBuf) < 0)
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fprintf(stderr, "/etc/fstab file missing -- install one to name /dev/root.\n\n");
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struct stat statBuf;
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if (stat("/etc/fstab", &statBuf) < 0)
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fprintf(stderr,
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"/etc/fstab file missing -- install one to name /dev/root.\n\n");
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}
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#endif
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/* Seperate standard mount options from the nonstandard string options */
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static void
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parse_mount_options ( char *options, unsigned long *flags, char *strflags)
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parse_mount_options(char *options, unsigned long *flags, char *strflags)
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{
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while (options) {
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int gotone=FALSE;
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char *comma = strchr (options, ',');
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const struct mount_options* f = mount_options;
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if (comma)
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*comma = '\0';
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while (options) {
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int gotone = FALSE;
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char *comma = strchr(options, ',');
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const struct mount_options *f = mount_options;
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while (f->name != 0) {
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if (strcasecmp (f->name, options) == 0) {
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if (comma)
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*comma = '\0';
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*flags &= f->and;
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*flags |= f->or;
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gotone=TRUE;
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break;
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}
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f++;
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}
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while (f->name != 0) {
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if (strcasecmp(f->name, options) == 0) {
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*flags &= f->and;
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*flags |= f->or;
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gotone = TRUE;
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break;
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}
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f++;
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}
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#if defined BB_FEATURE_MOUNT_LOOP
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if (gotone==FALSE && !strcasecmp ("loop", options)) { /* loop device support */
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use_loop = 1;
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gotone=TRUE;
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}
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if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
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use_loop = 1;
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gotone = TRUE;
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}
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#endif
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if (*strflags && strflags!= '\0' && gotone==FALSE) {
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char *temp=strflags;
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temp += strlen (strflags);
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*temp++ = ',';
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*temp++ = '\0';
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if (*strflags && strflags != '\0' && gotone == FALSE) {
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char *temp = strflags;
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temp += strlen(strflags);
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*temp++ = ',';
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*temp++ = '\0';
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}
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if (gotone == FALSE)
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strcat(strflags, options);
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if (comma) {
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*comma = ',';
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options = ++comma;
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} else {
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break;
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}
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}
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if (gotone==FALSE)
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strcat (strflags, options);
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if (comma) {
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*comma = ',';
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options = ++comma;
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} else {
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break;
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}
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}
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}
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int
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mount_one(char *blockDevice, char *directory, char *filesystemType,
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unsigned long flags, char *string_flags, int useMtab, int fakeIt, char *mtab_opts)
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unsigned long flags, char *string_flags, int useMtab, int fakeIt,
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char *mtab_opts)
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{
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int status = 0;
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int status = 0;
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char buf[255];
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char buf[255];
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#if defined BB_FEATURE_USE_PROCFS
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if (strcmp(filesystemType, "auto") == 0) {
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FILE *f = fopen ("/proc/filesystems", "r");
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if (strcmp(filesystemType, "auto") == 0) {
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FILE *f = fopen("/proc/filesystems", "r");
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if (f == NULL)
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return( FALSE);
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if (f == NULL)
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return (FALSE);
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while (fgets (buf, sizeof (buf), f) != NULL) {
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filesystemType = buf;
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if (*filesystemType == '\t') { // Not a nodev filesystem
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while (fgets(buf, sizeof(buf), f) != NULL) {
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filesystemType = buf;
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if (*filesystemType == '\t') { // Not a nodev filesystem
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// Add NULL termination to each line
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while (*filesystemType && *filesystemType != '\n')
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filesystemType++;
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*filesystemType = '\0';
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// Add NULL termination to each line
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while (*filesystemType && *filesystemType != '\n')
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filesystemType++;
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*filesystemType = '\0';
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filesystemType = buf;
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filesystemType++; // hop past tab
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filesystemType = buf;
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filesystemType++; // hop past tab
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status = do_mount (blockDevice, directory, filesystemType,
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flags | MS_MGC_VAL, string_flags, useMtab,
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fakeIt, mtab_opts);
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if (status == TRUE)
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break;
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}
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}
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fclose (f);
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} else
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status = do_mount(blockDevice, directory, filesystemType,
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flags | MS_MGC_VAL, string_flags,
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useMtab, fakeIt, mtab_opts);
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if (status == TRUE)
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break;
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}
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}
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fclose(f);
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} else
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#endif
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{
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status = do_mount (blockDevice, directory, filesystemType,
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flags | MS_MGC_VAL, string_flags, useMtab,
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fakeIt, mtab_opts);
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}
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{
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status = do_mount(blockDevice, directory, filesystemType,
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flags | MS_MGC_VAL, string_flags, useMtab,
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fakeIt, mtab_opts);
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}
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if (status==FALSE) {
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fprintf (stderr, "Mounting %s on %s failed: %s\n",
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blockDevice, directory, strerror(errno));
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return (FALSE);
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}
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return (TRUE);
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if (status == FALSE) {
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fprintf(stderr, "Mounting %s on %s failed: %s\n",
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blockDevice, directory, strerror(errno));
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return (FALSE);
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}
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return (TRUE);
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}
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extern int mount_main (int argc, char **argv)
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extern int mount_main(int argc, char **argv)
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{
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char string_flags_buf[1024]="";
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char *string_flags = string_flags_buf;
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char *extra_opts = string_flags_buf;
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unsigned long flags = 0;
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char *filesystemType = "auto";
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char *device = NULL;
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char *directory = NULL;
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int all = FALSE;
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int fakeIt = FALSE;
|
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int useMtab = TRUE;
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int i;
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char string_flags_buf[1024] = "";
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char *string_flags = string_flags_buf;
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char *extra_opts = string_flags_buf;
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unsigned long flags = 0;
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char *filesystemType = "auto";
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char *device = NULL;
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char *directory = NULL;
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int all = FALSE;
|
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int fakeIt = FALSE;
|
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int useMtab = TRUE;
|
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int i;
|
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|
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/* Only compiled in if BB_MTAB is not defined */
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whine_if_fstab_is_missing();
|
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/* Only compiled in if BB_MTAB is not defined */
|
||||
whine_if_fstab_is_missing();
|
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|
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if (argc == 1) {
|
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FILE *mountTable = setmntent (mtab_file, "r");
|
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if (mountTable) {
|
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struct mntent *m;
|
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while ((m = getmntent (mountTable)) != 0) {
|
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struct fstab* fstabItem;
|
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char *blockDevice = m->mnt_fsname;
|
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/* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
|
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if (strcmp (blockDevice, "/dev/root") == 0) {
|
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fstabItem = getfsfile ("/");
|
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if (fstabItem != NULL)
|
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blockDevice = fstabItem->fs_spec;
|
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if (argc == 1) {
|
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FILE *mountTable = setmntent(mtab_file, "r");
|
||||
|
||||
if (mountTable) {
|
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struct mntent *m;
|
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|
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while ((m = getmntent(mountTable)) != 0) {
|
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struct fstab *fstabItem;
|
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char *blockDevice = m->mnt_fsname;
|
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|
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/* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
|
||||
if (strcmp(blockDevice, "/dev/root") == 0) {
|
||||
fstabItem = getfsfile("/");
|
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if (fstabItem != NULL)
|
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blockDevice = fstabItem->fs_spec;
|
||||
}
|
||||
printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
|
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m->mnt_type, m->mnt_opts);
|
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}
|
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endmntent(mountTable);
|
||||
} else {
|
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perror(mtab_file);
|
||||
}
|
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printf ("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
|
||||
m->mnt_type, m->mnt_opts);
|
||||
}
|
||||
endmntent (mountTable);
|
||||
} else {
|
||||
perror(mtab_file);
|
||||
exit(TRUE);
|
||||
}
|
||||
exit( TRUE);
|
||||
}
|
||||
|
||||
|
||||
/* Parse options */
|
||||
i = --argc;
|
||||
argv++;
|
||||
while (i > 0 && **argv) {
|
||||
if (**argv == '-') {
|
||||
char *opt = *argv;
|
||||
while (i>0 && *++opt) switch (*opt) {
|
||||
case 'o':
|
||||
if (--i == 0) {
|
||||
goto goodbye;
|
||||
}
|
||||
parse_mount_options (*(++argv), &flags, string_flags);
|
||||
break;
|
||||
case 'r':
|
||||
flags |= MS_RDONLY;
|
||||
break;
|
||||
case 't':
|
||||
if (--i == 0) {
|
||||
goto goodbye;
|
||||
}
|
||||
filesystemType = *(++argv);
|
||||
break;
|
||||
case 'w':
|
||||
flags &= ~MS_RDONLY;
|
||||
break;
|
||||
case 'a':
|
||||
all = TRUE;
|
||||
break;
|
||||
#ifdef BB_MTAB
|
||||
case 'f':
|
||||
fakeIt = TRUE;
|
||||
break;
|
||||
case 'n':
|
||||
useMtab = FALSE;
|
||||
break;
|
||||
#endif
|
||||
case 'v':
|
||||
case 'h':
|
||||
case '-':
|
||||
goto goodbye;
|
||||
}
|
||||
} else {
|
||||
if (device == NULL)
|
||||
device = *argv;
|
||||
else if (directory == NULL)
|
||||
directory = *argv;
|
||||
else {
|
||||
goto goodbye;
|
||||
}
|
||||
}
|
||||
i--;
|
||||
/* Parse options */
|
||||
i = --argc;
|
||||
argv++;
|
||||
}
|
||||
while (i > 0 && **argv) {
|
||||
if (**argv == '-') {
|
||||
char *opt = *argv;
|
||||
|
||||
if (all == TRUE) {
|
||||
struct mntent *m;
|
||||
FILE *f = setmntent ("/etc/fstab", "r");
|
||||
|
||||
if (f == NULL) {
|
||||
perror("/etc/fstab");
|
||||
exit( FALSE);
|
||||
}
|
||||
while ((m = getmntent (f)) != NULL) {
|
||||
// If the file system isn't noauto, and isn't mounted on /,
|
||||
// and isn't swap or nfs, then mount it
|
||||
if ((!strstr (m->mnt_opts, "noauto")) &&
|
||||
(m->mnt_dir[1] != '\0') &&
|
||||
(!strstr (m->mnt_type, "swap")) &&
|
||||
(!strstr (m->mnt_type, "nfs")))
|
||||
{
|
||||
flags = 0;
|
||||
*string_flags = '\0';
|
||||
parse_mount_options(m->mnt_opts, &flags, string_flags);
|
||||
mount_one (m->mnt_fsname, m->mnt_dir, m->mnt_type,
|
||||
flags, string_flags, useMtab, fakeIt, extra_opts);
|
||||
}
|
||||
}
|
||||
endmntent (f);
|
||||
} else {
|
||||
if (device && directory) {
|
||||
#ifdef BB_NFSMOUNT
|
||||
if (strcmp(filesystemType, "nfs") == 0) {
|
||||
if (nfsmount(device, directory, &flags, &extra_opts, &string_flags, 1) != 0)
|
||||
exit(FALSE);
|
||||
}
|
||||
while (i > 0 && *++opt)
|
||||
switch (*opt) {
|
||||
case 'o':
|
||||
if (--i == 0) {
|
||||
goto goodbye;
|
||||
}
|
||||
parse_mount_options(*(++argv), &flags, string_flags);
|
||||
break;
|
||||
case 'r':
|
||||
flags |= MS_RDONLY;
|
||||
break;
|
||||
case 't':
|
||||
if (--i == 0) {
|
||||
goto goodbye;
|
||||
}
|
||||
filesystemType = *(++argv);
|
||||
break;
|
||||
case 'w':
|
||||
flags &= ~MS_RDONLY;
|
||||
break;
|
||||
case 'a':
|
||||
all = TRUE;
|
||||
break;
|
||||
#ifdef BB_MTAB
|
||||
case 'f':
|
||||
fakeIt = TRUE;
|
||||
break;
|
||||
case 'n':
|
||||
useMtab = FALSE;
|
||||
break;
|
||||
#endif
|
||||
exit (mount_one (device, directory, filesystemType,
|
||||
flags, string_flags, useMtab, fakeIt, extra_opts));
|
||||
} else {
|
||||
goto goodbye;
|
||||
case 'v':
|
||||
case 'h':
|
||||
case '-':
|
||||
goto goodbye;
|
||||
}
|
||||
} else {
|
||||
if (device == NULL)
|
||||
device = *argv;
|
||||
else if (directory == NULL)
|
||||
directory = *argv;
|
||||
else {
|
||||
goto goodbye;
|
||||
}
|
||||
}
|
||||
i--;
|
||||
argv++;
|
||||
}
|
||||
}
|
||||
exit( TRUE);
|
||||
|
||||
goodbye:
|
||||
usage( mount_usage);
|
||||
if (all == TRUE) {
|
||||
struct mntent *m;
|
||||
FILE *f = setmntent("/etc/fstab", "r");
|
||||
|
||||
if (f == NULL) {
|
||||
perror("/etc/fstab");
|
||||
exit(FALSE);
|
||||
}
|
||||
while ((m = getmntent(f)) != NULL) {
|
||||
// If the file system isn't noauto, and isn't mounted on /,
|
||||
// and isn't swap or nfs, then mount it
|
||||
if ((!strstr(m->mnt_opts, "noauto")) &&
|
||||
(m->mnt_dir[1] != '\0') &&
|
||||
(!strstr(m->mnt_type, "swap")) &&
|
||||
(!strstr(m->mnt_type, "nfs"))) {
|
||||
flags = 0;
|
||||
*string_flags = '\0';
|
||||
parse_mount_options(m->mnt_opts, &flags, string_flags);
|
||||
mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type,
|
||||
flags, string_flags, useMtab, fakeIt,
|
||||
extra_opts);
|
||||
}
|
||||
}
|
||||
endmntent(f);
|
||||
} else {
|
||||
if (device && directory) {
|
||||
#ifdef BB_NFSMOUNT
|
||||
if (strcmp(filesystemType, "nfs") == 0) {
|
||||
if (nfsmount
|
||||
(device, directory, &flags, &extra_opts, &string_flags,
|
||||
1) != 0)
|
||||
exit(FALSE);
|
||||
}
|
||||
#endif
|
||||
exit(mount_one(device, directory, filesystemType,
|
||||
flags, string_flags, useMtab, fakeIt,
|
||||
extra_opts));
|
||||
} else {
|
||||
goto goodbye;
|
||||
}
|
||||
}
|
||||
exit(TRUE);
|
||||
|
||||
goodbye:
|
||||
usage(mount_usage);
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user