14f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project/* 24f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project * mount.c, by rmk 34f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project */ 44f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 54f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project#include <sys/mount.h> 64f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project#include <sys/stat.h> 74f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project#include <fcntl.h> 84f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project#include <errno.h> 94f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project#include <stdio.h> 104f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project#include <stdlib.h> 114f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project#include <string.h> 124f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project#include <unistd.h> 134f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 144f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project#include <linux/loop.h> 154f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 164f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) 174f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 18940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall#define DEFAULT_LOOP_DEVICE "/dev/block/loop0" 19940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall#define LOOPDEV_MAXLEN 64 204f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 214f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectstruct mount_opts { 2229a5298366f0070bcc359e982eb31d49f84a92c1Nick Kralevich const char str[16]; 234f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project unsigned long rwmask; 244f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project unsigned long rwset; 254f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project unsigned long rwnoset; 264f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project}; 274f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 284f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectstruct extra_opts { 294f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project char *str; 304f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project char *end; 314f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project int used_size; 324f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project int alloc_size; 334f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project}; 344f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 354f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project/* 364f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project * These options define the function of "mount(2)". 374f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project */ 384f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project#define MS_TYPE (MS_REMOUNT|MS_BIND|MS_MOVE) 394f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 404f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 414f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectstatic const struct mount_opts options[] = { 424f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project /* name mask set noset */ 434f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "async", MS_SYNCHRONOUS, 0, MS_SYNCHRONOUS }, 444f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "atime", MS_NOATIME, 0, MS_NOATIME }, 454f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "bind", MS_TYPE, MS_BIND, 0, }, 464f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "dev", MS_NODEV, 0, MS_NODEV }, 474f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "diratime", MS_NODIRATIME, 0, MS_NODIRATIME }, 484f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "dirsync", MS_DIRSYNC, MS_DIRSYNC, 0 }, 494f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "exec", MS_NOEXEC, 0, MS_NOEXEC }, 504f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "move", MS_TYPE, MS_MOVE, 0 }, 514f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "recurse", MS_REC, MS_REC, 0 }, 52bfcd810b792f7ffbb2ec1360c0c2662725fd0362Jeff Sharkey { "rec", MS_REC, MS_REC, 0 }, 534f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "remount", MS_TYPE, MS_REMOUNT, 0 }, 544f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "ro", MS_RDONLY, MS_RDONLY, 0 }, 554f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "rw", MS_RDONLY, 0, MS_RDONLY }, 564f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "suid", MS_NOSUID, 0, MS_NOSUID }, 574f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "sync", MS_SYNCHRONOUS, MS_SYNCHRONOUS, 0 }, 584f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project { "verbose", MS_VERBOSE, MS_VERBOSE, 0 }, 59bfcd810b792f7ffbb2ec1360c0c2662725fd0362Jeff Sharkey { "unbindable", MS_UNBINDABLE, MS_UNBINDABLE, 0 }, 60bfcd810b792f7ffbb2ec1360c0c2662725fd0362Jeff Sharkey { "private", MS_PRIVATE, MS_PRIVATE, 0 }, 61bfcd810b792f7ffbb2ec1360c0c2662725fd0362Jeff Sharkey { "slave", MS_SLAVE, MS_SLAVE, 0 }, 62bfcd810b792f7ffbb2ec1360c0c2662725fd0362Jeff Sharkey { "shared", MS_SHARED, MS_SHARED, 0 }, 634f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project}; 644f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 654f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectstatic void add_extra_option(struct extra_opts *extra, char *s) 664f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project{ 674f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project int len = strlen(s); 6829a5298366f0070bcc359e982eb31d49f84a92c1Nick Kralevich int newlen; 694f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 704f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (extra->str) 714f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project len++; /* +1 for ',' */ 7229a5298366f0070bcc359e982eb31d49f84a92c1Nick Kralevich newlen = extra->used_size + len; 734f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 744f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (newlen >= extra->alloc_size) { 754f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project char *new; 764f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 774f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project new = realloc(extra->str, newlen + 1); /* +1 for NUL */ 784f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (!new) 794f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project return; 804f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 814f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project extra->str = new; 824f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project extra->end = extra->str + extra->used_size; 8329a5298366f0070bcc359e982eb31d49f84a92c1Nick Kralevich extra->alloc_size = newlen + 1; 844f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 854f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 864f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (extra->used_size) { 874f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project *extra->end = ','; 884f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project extra->end++; 894f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 904f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project strcpy(extra->end, s); 914f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project extra->used_size += len; 924f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 934f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project} 944f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 954f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectstatic unsigned long 96940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrallparse_mount_options(char *arg, unsigned long rwflag, struct extra_opts *extra, int* loop, char *loopdev) 974f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project{ 984f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project char *s; 994f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 1004f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project *loop = 0; 1014f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project while ((s = strsep(&arg, ",")) != NULL) { 1024f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project char *opt = s; 1034f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project unsigned int i; 1044f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project int res, no = s[0] == 'n' && s[1] == 'o'; 1054f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 1064f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (no) 1074f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project s += 2; 1084f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 109940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall if (strncmp(s, "loop=", 5) == 0) { 110940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall *loop = 1; 111940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall strlcpy(loopdev, s + 5, LOOPDEV_MAXLEN); 112940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall continue; 113940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall } 114940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall 1154f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (strcmp(s, "loop") == 0) { 1164f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project *loop = 1; 117940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall strlcpy(loopdev, DEFAULT_LOOP_DEVICE, LOOPDEV_MAXLEN); 1184f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project continue; 1194f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 1204f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project for (i = 0, res = 1; i < ARRAY_SIZE(options); i++) { 1214f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project res = strcmp(s, options[i].str); 1224f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 1234f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (res == 0) { 1244f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project rwflag &= ~options[i].rwmask; 1254f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (no) 1264f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project rwflag |= options[i].rwnoset; 1274f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project else 1284f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project rwflag |= options[i].rwset; 1294f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 1304f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (res <= 0) 1314f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project break; 1324f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 1334f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 1344f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (res != 0 && s[0]) 1354f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project add_extra_option(extra, opt); 1364f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 1374f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 1384f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project return rwflag; 1394f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project} 1404f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 141e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich/* 142e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich * Mark the given block device as read-write, using the BLKROSET ioctl. 143e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich */ 144e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevichstatic void fs_set_blk_rw(const char *blockdev) 145e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich{ 146e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich int fd; 147e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich int OFF = 0; 148e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich 149e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich fd = open(blockdev, O_RDONLY); 150e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich if (fd < 0) { 151e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich // should never happen 152e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich return; 153e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich } 154e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich 155e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich ioctl(fd, BLKROSET, &OFF); 156e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich close(fd); 157e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich} 158e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich 1594f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectstatic char *progname; 1604f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 1614f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectstatic struct extra_opts extra; 1624f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectstatic unsigned long rwflag; 1634f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 1644f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectstatic int 165940c81078e7291096b22f05f6b953658f1e1d730Ken Sumralldo_mount(char *dev, char *dir, char *type, unsigned long rwflag, void *data, int loop, 166940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall char *loopdev) 1674f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project{ 1684f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project char *s; 1694f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project int error = 0; 1704f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 1714f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (loop) { 1724f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project int file_fd, device_fd; 173bc7b0cbe156da639f0cbe17bf89725d87e86512aJay Freeman (saurik) int flags; 174bc7b0cbe156da639f0cbe17bf89725d87e86512aJay Freeman (saurik) 175bc7b0cbe156da639f0cbe17bf89725d87e86512aJay Freeman (saurik) flags = (rwflag & MS_RDONLY) ? O_RDONLY : O_RDWR; 1764f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 177bc7b0cbe156da639f0cbe17bf89725d87e86512aJay Freeman (saurik) file_fd = open(dev, flags); 178940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall if (file_fd < 0) { 1794f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project perror("open backing file failed"); 1804f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project return 1; 1814f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 182940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall device_fd = open(loopdev, flags); 183940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall if (device_fd < 0) { 1844f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project perror("open loop device failed"); 1854f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project close(file_fd); 1864f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project return 1; 1874f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 1884f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (ioctl(device_fd, LOOP_SET_FD, file_fd) < 0) { 1894f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project perror("ioctl LOOP_SET_FD failed"); 1904f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project close(file_fd); 1914f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project close(device_fd); 1924f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project return 1; 1934f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 1944f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 1954f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project close(file_fd); 1964f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project close(device_fd); 197940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall dev = loopdev; 1984f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 1994f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 200e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich if ((rwflag & MS_RDONLY) == 0) { 201e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich fs_set_blk_rw(dev); 202e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich } 203e18c0d508a6d8b4376c6f0b8c22600e5aca37f69Nick Kralevich 2044f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project while ((s = strsep(&type, ",")) != NULL) { 2054f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectretry: 2064f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (mount(dev, dir, s, rwflag, data) == -1) { 2074f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project error = errno; 2084f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project /* 2094f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project * If the filesystem is not found, or the 2104f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project * superblock is invalid, try the next. 2114f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project */ 2124f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (error == ENODEV || error == EINVAL) 2134f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project continue; 2144f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 2154f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project /* 2164f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project * If we get EACCESS, and we're trying to 2174f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project * mount readwrite and this isn't a remount, 2184f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project * try read only. 2194f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project */ 2204f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (error == EACCES && 2214f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project (rwflag & (MS_REMOUNT|MS_RDONLY)) == 0) { 2224f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project rwflag |= MS_RDONLY; 2234f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project goto retry; 2244f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 2254f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project break; 2264f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 2274f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 2284f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 2294f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (error) { 2304f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project errno = error; 2314f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project perror("mount"); 2324f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project return 255; 2334f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 2344f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 2354f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project return 0; 2364f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project} 2374f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 2384f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectstatic int print_mounts() 2394f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project{ 2404f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project FILE* f; 2414f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project int length; 2424f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project char buffer[100]; 2434f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 2444f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project f = fopen("/proc/mounts", "r"); 2454f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (!f) { 2464f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project fprintf(stdout, "could not open /proc/mounts\n"); 2474f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project return -1; 2484f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 2494f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 2504f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project do { 2514f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project length = fread(buffer, 1, 100, f); 2524f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (length > 0) 2534f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project fwrite(buffer, 1, length, stdout); 2544f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } while (length > 0); 2554f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 2564f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project fclose(f); 2574f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project return 0; 2584f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project} 2594f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 2604e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Crossstatic int get_mounts_dev_dir(const char *arg, char **dev, char **dir) 2614e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross{ 2624e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross FILE *f; 2634e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross char mount_dev[256]; 2644e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross char mount_dir[256]; 2654e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross char mount_type[256]; 2664e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross char mount_opts[256]; 2674e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross int mount_freq; 2684e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross int mount_passno; 2694e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross int match; 2704e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross 2714e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross f = fopen("/proc/mounts", "r"); 2724e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross if (!f) { 2734e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross fprintf(stdout, "could not open /proc/mounts\n"); 2744e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross return -1; 2754e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross } 2764e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross 2774e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross do { 2784e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross match = fscanf(f, "%255s %255s %255s %255s %d %d\n", 2794e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross mount_dev, mount_dir, mount_type, 2804e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross mount_opts, &mount_freq, &mount_passno); 2814e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross mount_dev[255] = 0; 2824e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross mount_dir[255] = 0; 2834e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross mount_type[255] = 0; 2844e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross mount_opts[255] = 0; 2854e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross if (match == 6 && 2864e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross (strcmp(arg, mount_dev) == 0 || 2874e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross strcmp(arg, mount_dir) == 0)) { 2884e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross *dev = strdup(mount_dev); 2894e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross *dir = strdup(mount_dir); 2904e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross fclose(f); 2914e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross return 0; 2924e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross } 2934e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross } while (match != EOF); 2944e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross 2954e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross fclose(f); 2964e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross return -1; 2974e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross} 2984e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross 2994f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Projectint mount_main(int argc, char *argv[]) 3004f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project{ 3014f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project char *type = NULL; 3024e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross char *dev = NULL; 3034e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross char *dir = NULL; 3044f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project int c; 305383688b52fb19b9c4d98bb1a660febc880d0e268Dima Zavin int loop = 0; 306940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall char loopdev[LOOPDEV_MAXLEN]; 3074f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 3084f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project progname = argv[0]; 3094f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project rwflag = MS_VERBOSE; 3104f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 3114f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project // mount with no arguments is equivalent to "cat /proc/mounts" 3124f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (argc == 1) return print_mounts(); 3134f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 3144f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project do { 3154f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project c = getopt(argc, argv, "o:rt:w"); 3164f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (c == EOF) 3174f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project break; 3184f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project switch (c) { 3194f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project case 'o': 320940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall rwflag = parse_mount_options(optarg, rwflag, &extra, &loop, loopdev); 3214f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project break; 3224f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project case 'r': 3234f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project rwflag |= MS_RDONLY; 3244f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project break; 3254f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project case 't': 3264f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project type = optarg; 3274f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project break; 3284f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project case 'w': 3294f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project rwflag &= ~MS_RDONLY; 3304f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project break; 3314f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project case '?': 3324f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project fprintf(stderr, "%s: invalid option -%c\n", 3334f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project progname, optopt); 3344f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project exit(1); 3354f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 3364f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } while (1); 3374f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 3384f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project /* 3394f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project * If remount, bind or move was specified, then we don't 3404f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project * have a "type" as such. Use the dummy "none" type. 3414f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project */ 3424f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project if (rwflag & MS_TYPE) 3434f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project type = "none"; 3444f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 3454e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross if (optind + 2 == argc) { 3464e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross dev = argv[optind]; 3474e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross dir = argv[optind + 1]; 3484e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross } else if (optind + 1 == argc && rwflag & MS_REMOUNT) { 3494e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross get_mounts_dev_dir(argv[optind], &dev, &dir); 3504e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross } 3514e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross 3524e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross if (dev == NULL || dir == NULL || type == NULL) { 3534f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project fprintf(stderr, "Usage: %s [-r] [-w] [-o options] [-t type] " 3544f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project "device directory\n", progname); 3554f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project exit(1); 3564f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project } 3574f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project 358940c81078e7291096b22f05f6b953658f1e1d730Ken Sumrall return do_mount(dev, dir, type, rwflag, extra.str, loop, loopdev); 3594e7dd3d270aaf0b43e94b2ccaf840f86e541d21bColin Cross /* We leak dev and dir in some cases, but we're about to exit */ 3604f6e8d7a00cbeda1e70cc15be9c4af1018bdad5The Android Open Source Project} 361