1 // 2 //this code was developed my Miklos Szeredi <miklos (at) szeredi.hu> 3 //and modified by Ram Pai <linuxram (at) us.ibm.com> 4 // sample usage: 5 // newmount /tmp shared 6 // 7 #include <stdio.h> 8 #include <stdlib.h> 9 #include <string.h> 10 11 #include <unistd.h> 12 #include <sys/mount.h> 13 #include <sys/fsuid.h> 14 15 #ifndef MS_REC 16 #define MS_REC 0x4000 /* 16384: Recursive loopback */ 17 #endif 18 19 #ifndef MS_SHARED 20 #define MS_SHARED 1<<20 /* Shared */ 21 #endif 22 23 #ifndef MS_PRIVATE 24 #define MS_PRIVATE 1<<18 /* Private */ 25 #endif 26 27 #ifndef MS_SLAVE 28 #define MS_SLAVE 1<<19 /* Slave */ 29 #endif 30 31 #ifndef MS_UNCLONE 32 #define MS_UNCLONE 1<<17 /* UNCLONE */ 33 #endif 34 35 int main(int argc, char *argv[]) 36 { 37 int type; 38 if (argc != 3) { 39 fprintf(stderr, "usage: %s DIR " 40 "[rshared|rslave|rprivate|runclone|shared|slave|private|unclone]\n", 41 argv[0]); 42 return 1; 43 } 44 45 fprintf(stdout, "%s %s %s\n", argv[0], argv[1], argv[2]); 46 47 if (strcmp(argv[2], "rshared") == 0) 48 type = (MS_SHARED | MS_REC); 49 else if (strcmp(argv[2], "rslave") == 0) 50 type = (MS_SLAVE | MS_REC); 51 else if (strcmp(argv[2], "rprivate") == 0) 52 type = (MS_PRIVATE | MS_REC); 53 else if (strcmp(argv[2], "runclone") == 0) 54 type = (MS_UNCLONE | MS_REC); 55 else if (strcmp(argv[2], "shared") == 0) 56 type = MS_SHARED; 57 else if (strcmp(argv[2], "slave") == 0) 58 type = MS_SLAVE; 59 else if (strcmp(argv[2], "private") == 0) 60 type = MS_PRIVATE; 61 else if (strcmp(argv[2], "unclone") == 0) 62 type = MS_UNCLONE; 63 else { 64 fprintf(stderr, "invalid operation: %s\n", argv[2]); 65 return 1; 66 } 67 setfsuid(getuid()); 68 if (mount("", argv[1], "ext2", type, "") == -1) { 69 perror("mount"); 70 return 1; 71 } 72 return 0; 73 } 74
