/* vi: set sw=4 ts=4: */ #include #include #include #include #include #include #include "busybox.h" extern const char mtab_file[]; /* Defined in utility.c */ static const int MS_RDONLY = 1; /* Mount read-only. */ void erase_mtab(const char *name) { struct mntent entries[20]; int count = 0; FILE *mountTable = setmntent(mtab_file, "r"); struct mntent *m; /* Check if reading the mtab file failed */ if (mountTable == 0 /* Bummer. fall back on trying the /proc filesystem */ && (mountTable = setmntent("/proc/mounts", "r")) == 0) { perror_msg("%s", mtab_file); return; } while ((m = getmntent(mountTable)) != 0) { entries[count].mnt_fsname = strdup(m->mnt_fsname); entries[count].mnt_dir = strdup(m->mnt_dir); entries[count].mnt_type = strdup(m->mnt_type); entries[count].mnt_opts = strdup(m->mnt_opts); entries[count].mnt_freq = m->mnt_freq; entries[count].mnt_passno = m->mnt_passno; count++; } endmntent(mountTable); if ((mountTable = setmntent(mtab_file, "w"))) { int i; for (i = 0; i < count; i++) { int result = (strcmp(entries[i].mnt_fsname, name) == 0 || strcmp(entries[i].mnt_dir, name) == 0); if (result) continue; else addmntent(mountTable, &entries[i]); } endmntent(mountTable); } else if (errno != EROFS) perror_msg("%s", mtab_file); } void write_mtab(char *blockDevice, char *directory, char *filesystemType, long flags, char *string_flags) { FILE *mountTable = setmntent(mtab_file, "a+"); struct mntent m; if (mountTable == 0) { perror_msg("%s", mtab_file); return; } if (mountTable) { int length = strlen(directory); if (length > 1 && directory[length - 1] == '/') directory[length - 1] = '\0'; if (filesystemType == 0) { struct mntent *p = find_mount_point(blockDevice, "/proc/mounts"); if (p && p->mnt_type) filesystemType = p->mnt_type; } m.mnt_fsname = blockDevice; m.mnt_dir = directory; m.mnt_type = filesystemType ? filesystemType : "default"; if (*string_flags) { m.mnt_opts = string_flags; } else { if ((flags | MS_RDONLY) == flags) m.mnt_opts = "ro"; else m.mnt_opts = "rw"; } m.mnt_freq = 0; m.mnt_passno = 0; addmntent(mountTable, &m); endmntent(mountTable); } }