From e54eebbf1a908d65ee8cf80bab62821c05666d70 Mon Sep 17 00:00:00 2001 From: The Android Open Source Project Date: Tue, 3 Mar 2009 18:29:04 -0800 Subject: auto import from //depot/cupcake/@135843 --- toolbox/mount.c | 273 -------------------------------------------------------- 1 file changed, 273 deletions(-) delete mode 100644 toolbox/mount.c (limited to 'toolbox/mount.c') diff --git a/toolbox/mount.c b/toolbox/mount.c deleted file mode 100644 index ef13e1f..0000000 --- a/toolbox/mount.c +++ /dev/null @@ -1,273 +0,0 @@ -/* - * mount.c, by rmk - */ - -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) - -// FIXME - only one loop mount is supported at a time -#define LOOP_DEVICE "/dev/block/loop0" - -struct mount_opts { - const char str[8]; - unsigned long rwmask; - unsigned long rwset; - unsigned long rwnoset; -}; - -struct extra_opts { - char *str; - char *end; - int used_size; - int alloc_size; -}; - -/* - * These options define the function of "mount(2)". - */ -#define MS_TYPE (MS_REMOUNT|MS_BIND|MS_MOVE) - - -static const struct mount_opts options[] = { - /* name mask set noset */ - { "async", MS_SYNCHRONOUS, 0, MS_SYNCHRONOUS }, - { "atime", MS_NOATIME, 0, MS_NOATIME }, - { "bind", MS_TYPE, MS_BIND, 0, }, - { "dev", MS_NODEV, 0, MS_NODEV }, - { "diratime", MS_NODIRATIME, 0, MS_NODIRATIME }, - { "dirsync", MS_DIRSYNC, MS_DIRSYNC, 0 }, - { "exec", MS_NOEXEC, 0, MS_NOEXEC }, - { "move", MS_TYPE, MS_MOVE, 0 }, - { "recurse", MS_REC, MS_REC, 0 }, - { "remount", MS_TYPE, MS_REMOUNT, 0 }, - { "ro", MS_RDONLY, MS_RDONLY, 0 }, - { "rw", MS_RDONLY, 0, MS_RDONLY }, - { "suid", MS_NOSUID, 0, MS_NOSUID }, - { "sync", MS_SYNCHRONOUS, MS_SYNCHRONOUS, 0 }, - { "verbose", MS_VERBOSE, MS_VERBOSE, 0 }, -}; - -static void add_extra_option(struct extra_opts *extra, char *s) -{ - int len = strlen(s); - int newlen = extra->used_size + len; - - if (extra->str) - len++; /* +1 for ',' */ - - if (newlen >= extra->alloc_size) { - char *new; - - new = realloc(extra->str, newlen + 1); /* +1 for NUL */ - if (!new) - return; - - extra->str = new; - extra->end = extra->str + extra->used_size; - extra->alloc_size = newlen; - } - - if (extra->used_size) { - *extra->end = ','; - extra->end++; - } - strcpy(extra->end, s); - extra->used_size += len; - -} - -static unsigned long -parse_mount_options(char *arg, unsigned long rwflag, struct extra_opts *extra, int* loop) -{ - char *s; - - *loop = 0; - while ((s = strsep(&arg, ",")) != NULL) { - char *opt = s; - unsigned int i; - int res, no = s[0] == 'n' && s[1] == 'o'; - - if (no) - s += 2; - - if (strcmp(s, "loop") == 0) { - *loop = 1; - continue; - } - for (i = 0, res = 1; i < ARRAY_SIZE(options); i++) { - res = strcmp(s, options[i].str); - - if (res == 0) { - rwflag &= ~options[i].rwmask; - if (no) - rwflag |= options[i].rwnoset; - else - rwflag |= options[i].rwset; - } - if (res <= 0) - break; - } - - if (res != 0 && s[0]) - add_extra_option(extra, opt); - } - - return rwflag; -} - -static char *progname; - -static struct extra_opts extra; -static unsigned long rwflag; - -static int -do_mount(char *dev, char *dir, char *type, unsigned long rwflag, void *data, int loop) -{ - char *s; - int error = 0; - - if (loop) { - int file_fd, device_fd; - - // FIXME - only one loop mount supported at a time - file_fd = open(dev, O_RDWR); - if (file_fd < -1) { - perror("open backing file failed"); - return 1; - } - device_fd = open(LOOP_DEVICE, O_RDWR); - if (device_fd < -1) { - perror("open loop device failed"); - close(file_fd); - return 1; - } - if (ioctl(device_fd, LOOP_SET_FD, file_fd) < 0) { - perror("ioctl LOOP_SET_FD failed"); - close(file_fd); - close(device_fd); - return 1; - } - - close(file_fd); - close(device_fd); - dev = LOOP_DEVICE; - } - - while ((s = strsep(&type, ",")) != NULL) { -retry: - if (mount(dev, dir, s, rwflag, data) == -1) { - error = errno; - /* - * If the filesystem is not found, or the - * superblock is invalid, try the next. - */ - if (error == ENODEV || error == EINVAL) - continue; - - /* - * If we get EACCESS, and we're trying to - * mount readwrite and this isn't a remount, - * try read only. - */ - if (error == EACCES && - (rwflag & (MS_REMOUNT|MS_RDONLY)) == 0) { - rwflag |= MS_RDONLY; - goto retry; - } - break; - } - } - - if (error) { - errno = error; - perror("mount"); - return 255; - } - - return 0; -} - -static int print_mounts() -{ - FILE* f; - int length; - char buffer[100]; - - f = fopen("/proc/mounts", "r"); - if (!f) { - fprintf(stdout, "could not open /proc/mounts\n"); - return -1; - } - - do { - length = fread(buffer, 1, 100, f); - if (length > 0) - fwrite(buffer, 1, length, stdout); - } while (length > 0); - - fclose(f); - return 0; -} - -int mount_main(int argc, char *argv[]) -{ - char *type = NULL; - int c; - int loop; - - progname = argv[0]; - rwflag = MS_VERBOSE; - - // mount with no arguments is equivalent to "cat /proc/mounts" - if (argc == 1) return print_mounts(); - - do { - c = getopt(argc, argv, "o:rt:w"); - if (c == EOF) - break; - switch (c) { - case 'o': - rwflag = parse_mount_options(optarg, rwflag, &extra, &loop); - break; - case 'r': - rwflag |= MS_RDONLY; - break; - case 't': - type = optarg; - break; - case 'w': - rwflag &= ~MS_RDONLY; - break; - case '?': - fprintf(stderr, "%s: invalid option -%c\n", - progname, optopt); - exit(1); - } - } while (1); - - /* - * If remount, bind or move was specified, then we don't - * have a "type" as such. Use the dummy "none" type. - */ - if (rwflag & MS_TYPE) - type = "none"; - - if (optind + 2 != argc || type == NULL) { - fprintf(stderr, "Usage: %s [-r] [-w] [-o options] [-t type] " - "device directory\n", progname); - exit(1); - } - - return do_mount(argv[optind], argv[optind + 1], type, rwflag, - extra.str, loop); -} -- cgit v1.1