1 /* ProcFS - service.c - the service subdirectory */ 2 3 #include "inc.h" 4 5 #include <minix/rs.h> 6 #include "rs/const.h" 7 #include "rs/type.h" 8 9 enum policy { 10 POL_NONE = 0x00, /* user | endpoint */ 11 POL_RESET = 0x01, /* visible | change */ 12 POL_RESTART = 0x02, /* transparent | preserved */ 13 POL_LIVE_UPDATE = 0x04 /* transparent | preserved */ 14 }; 15 16 struct policies { 17 #define MAX_POL_FORMAT_SZ 20 18 char formatted[MAX_POL_FORMAT_SZ]; 19 enum policy supported; 20 }; 21 22 static struct { 23 struct rproc proc[NR_SYS_PROCS]; 24 struct rprocpub pub[NR_SYS_PROCS]; 25 } rproc; 26 27 static struct policies policies[NR_SYS_PROCS]; 28 29 static struct inode *service_node; 30 31 /* Updates the policies state from RS. Always returns an ASCIIZ string. */ 32 static const char * 33 service_get_policies(struct policies * pol, index_t slot) 34 { 35 #if 1 /* The following should be retrieved from RS and formated instead. */ 36 int pos; 37 char *ref_label; 38 static const struct { 39 const char *label; 40 const char *policy_str; 41 } def_pol[] = { 42 /* audio */ 43 { .label = "es1370", .policy_str = "reset" }, 44 { .label = "es1371", .policy_str = "reset" }, 45 { .label = "sb16", .policy_str = "reset" }, 46 /* bus */ 47 { .label = "i2c", .policy_str = "restart" }, 48 { .label = "pci", .policy_str = "restart" }, 49 { .label = "ti1225", .policy_str = "restart" }, 50 /* clock */ 51 { .label = "readclock.drv", .policy_str = "restart" }, 52 /* eeprom */ 53 { .label = "cat24c256", .policy_str = "restart" }, 54 /* examples */ 55 { .label = "hello", .policy_str = "restart" }, 56 /* hid */ 57 { .label = "pckbd", .policy_str = "reset" }, 58 /* iommu */ 59 { .label = "amddev", .policy_str = "" }, 60 /* net */ 61 { .label = "3c90x", .policy_str = "reset" }, 62 { .label = "atl2", .policy_str = "reset" }, 63 { .label = "dec21140A", .policy_str = "reset" }, 64 { .label = "dp8390", .policy_str = "reset" }, 65 { .label = "dpeth", .policy_str = "reset" }, 66 { .label = "e1000", .policy_str = "reset" }, 67 { .label = "fxp", .policy_str = "reset" }, 68 { .label = "lance", .policy_str = "reset" }, 69 { .label = "lan8710a", .policy_str = "reset" }, 70 { .label = "orinoco", .policy_str = "reset" }, 71 { .label = "rtl8139", .policy_str = "reset" }, 72 { .label = "rtl8169", .policy_str = "reset" }, 73 { .label = "uds", .policy_str = "reset" }, 74 { .label = "virtio_net", .policy_str = "reset" }, 75 /* power */ 76 { .label = "acpi", .policy_str = "" }, 77 { .label = "tps65217", .policy_str = "" }, 78 { .label = "tps65590", .policy_str = "" }, 79 /* printer */ 80 { .label = "printer", .policy_str = "restart" }, 81 /* sensors */ 82 { .label = "bmp085", .policy_str = "" }, 83 { .label = "sht21", .policy_str = "restart" }, 84 { .label = "tsl2550", .policy_str = "restart" }, 85 /* storage */ 86 { .label = "ahci", .policy_str = "reset" }, 87 { .label = "at_wini", .policy_str = "reset" }, 88 { .label = "fbd", .policy_str = "reset" }, 89 { .label = "filter", .policy_str = "reset" }, 90 { .label = "floppy", .policy_str = "reset" }, 91 { .label = "memory", .policy_str = "restart" }, 92 { .label = "mmc", .policy_str = "reset" }, 93 { .label = "virtio_blk", .policy_str = "reset" }, 94 { .label = "vnd", .policy_str = "reset" }, 95 /* system */ 96 { .label = "gpio", .policy_str = "restart" }, 97 { .label = "log", .policy_str = "reset" }, 98 { .label = "random", .policy_str = "restart" }, 99 /* tty */ 100 { .label = "pty", .policy_str = "restart" }, 101 { .label = "tty", .policy_str = "restart" }, 102 /* usb */ 103 { .label = "usbd", .policy_str = "" }, 104 { .label = "usb_hub", .policy_str = "" }, 105 { .label = "usb_storage", .policy_str = "" }, 106 /* video */ 107 { .label = "fb", .policy_str = "" }, 108 { .label = "tda19988", .policy_str = "" }, 109 /* vmm_guest */ 110 { .label = "vbox", .policy_str = "" }, 111 /* fs */ 112 { .label = "ext2", .policy_str = "" }, 113 { .label = "hgfs", .policy_str = "" }, 114 { .label = "isofs", .policy_str = "" }, 115 { .label = "mfs", .policy_str = "restart" }, 116 { .label = "pfs", .policy_str = "restart" }, 117 { .label = "procfs", .policy_str = "restart" }, 118 { .label = "ptyfs", .policy_str = "" }, 119 { .label = "vbfs", .policy_str = "" }, 120 /* net */ 121 { .label = "inet", .policy_str = "reset" }, 122 { .label = "lwip", .policy_str = "" }, 123 /* servers */ 124 { .label = "devman", .policy_str = "restart" }, 125 { .label = "ds", .policy_str = "restart" }, 126 { .label = "input", .policy_str = "reset" }, 127 { .label = "ipc", .policy_str = "restart" }, 128 { .label = "is", .policy_str = "restart" }, 129 { .label = "pm", .policy_str = "restart" }, 130 { .label = "rs", .policy_str = "restart" }, 131 { .label = "sched", .policy_str = "restart" }, 132 { .label = "vfs", .policy_str = "restart" }, 133 { .label = "vm", .policy_str = "restart" }, 134 //{ .label = "", .policy_str = "" }, 135 }; 136 137 /* Find the related policy, based on the file name of the service. */ 138 ref_label = strrchr(rproc.pub[slot].proc_name, '/'); 139 if (NULL == ref_label) 140 ref_label = rproc.pub[slot].proc_name; 141 142 memset(pol[slot].formatted, 0, MAX_POL_FORMAT_SZ); 143 for(pos = 0; pos < (sizeof(def_pol) / sizeof(def_pol[0])); pos++) { 144 if (0 == strcmp(ref_label, def_pol[pos].label)) { 145 (void)strncpy(pol[slot].formatted, 146 def_pol[pos].policy_str, MAX_POL_FORMAT_SZ); 147 pol[slot].formatted[MAX_POL_FORMAT_SZ-1] = '\0'; 148 break; 149 } 150 } 151 #else 152 /* Should do something sensible, based on flags from RS/SEF. */ 153 #endif 154 155 return pol[slot].formatted; 156 } 157 158 /* Returns a ASCIIZ string encoding RS flags. */ 159 static const char * 160 service_get_flags(index_t slot) 161 { 162 static char str[10]; 163 int flags, sys_flags; 164 165 flags = rproc.proc[slot].r_flags; 166 sys_flags = rproc.pub[slot].sys_flags; 167 168 str[0] = (flags & RS_ACTIVE) ? 'A' : '-'; 169 str[1] = (flags & RS_UPDATING) ? 'U' : '-'; 170 str[2] = (flags & RS_EXITING) ? 'E' : '-'; 171 str[3] = (flags & RS_NOPINGREPLY) ? 'N' : '-'; 172 str[4] = (sys_flags & SF_USE_COPY) ? 'C' : '-'; 173 str[5] = (sys_flags & SF_USE_REPL) ? 'R' : '-'; 174 str[6] = (sys_flags & SF_NEED_COPY) ? 'c' : '-'; 175 str[7] = (sys_flags & SF_NEED_REPL) ? 'r' : '-'; 176 str[8] = (sys_flags & SF_CORE_SRV) ? 's' : '-'; 177 str[9] = '\0'; 178 179 return str; 180 } 181 182 /* 183 * Return whether a slot is in use and active. The purpose of this check is 184 * to ensure that after eliminating all slots that do not pass this check, we 185 * are left with a set of live services each with a unique label. 186 */ 187 static int 188 service_active(index_t slot) 189 { 190 191 /* 192 * Init is in RS's process tables as the representation of user 193 * processes. It is not a system service. 194 */ 195 return ((rproc.proc[slot].r_flags & (RS_IN_USE | RS_ACTIVE)) == 196 (RS_IN_USE | RS_ACTIVE) && 197 rproc.pub[slot].endpoint != INIT_PROC_NR); 198 } 199 200 /* 201 * Update the contents of the service directory, by first updating the RS 202 * tables and then updating the directory contents. 203 */ 204 static void 205 service_update(void) 206 { 207 struct inode *node; 208 struct inode_stat stat; 209 index_t slot; 210 static int warned = FALSE; 211 int r; 212 213 /* There is not much we can do if this call fails. */ 214 r = getsysinfo(RS_PROC_NR, SI_PROCALL_TAB, &rproc, sizeof(rproc)); 215 if (r != OK && !warned) { 216 printf("PROCFS: unable to obtain RS tables (%d)\n", r); 217 warned = TRUE; 218 } 219 220 /* 221 * As with PIDs, we make two passes. Delete first, then add. This 222 * prevents problems in the hypothetical case that between updates, one 223 * slot ends up with the label name of a previous, different slot. 224 */ 225 for (slot = 0; slot < NR_SYS_PROCS; slot++) { 226 if ((node = get_inode_by_index(service_node, slot)) == NULL) 227 continue; 228 229 /* 230 * If the slot is no longer in use, or the label name does not 231 * match, the node must be deleted. 232 */ 233 if (!service_active(slot) || 234 strcmp(get_inode_name(node), rproc.pub[slot].label)) 235 delete_inode(node); 236 } 237 238 memset(&stat, 0, sizeof(stat)); 239 stat.mode = REG_ALL_MODE; 240 stat.uid = SUPER_USER; 241 stat.gid = SUPER_USER; 242 243 for (slot = 0; slot < NR_SYS_PROCS; slot++) { 244 if (!service_active(slot) || 245 get_inode_by_index(service_node, slot) != NULL) 246 continue; 247 248 node = add_inode(service_node, rproc.pub[slot].label, slot, 249 &stat, (index_t)0, (cbdata_t)slot); 250 251 if (node == NULL) 252 out_of_inodes(); 253 } 254 } 255 256 /* 257 * Initialize the service directory. 258 */ 259 void 260 service_init(void) 261 { 262 struct inode *root, *node; 263 struct inode_stat stat; 264 265 root = get_root_inode(); 266 267 memset(&stat, 0, sizeof(stat)); 268 stat.mode = DIR_ALL_MODE; 269 stat.uid = SUPER_USER; 270 stat.gid = SUPER_USER; 271 272 service_node = add_inode(root, "service", NO_INDEX, &stat, 273 NR_SYS_PROCS, NULL); 274 275 if (service_node == NULL) 276 panic("unable to create service node"); 277 } 278 279 /* 280 * A lookup request is being performed. If it is in the service directory, 281 * update the tables. We do this lazily, to reduce overhead. 282 */ 283 void 284 service_lookup(struct inode * parent, clock_t now) 285 { 286 static clock_t last_update = 0; 287 288 if (parent != service_node) 289 return; 290 291 if (last_update != now) { 292 service_update(); 293 294 last_update = now; 295 } 296 } 297 298 /* 299 * A getdents request is being performed. If it is in the service directory, 300 * update the tables. 301 */ 302 void 303 service_getdents(struct inode * node) 304 { 305 306 if (node != service_node) 307 return; 308 309 service_update(); 310 } 311 312 /* 313 * A read request is being performed. If it is on a file in the service 314 * directory, process the read request. We rely on the fact that any read 315 * call will have been preceded by a lookup, so its table entry has been 316 * updated very recently. 317 */ 318 void 319 service_read(struct inode * node) 320 { 321 struct inode *parent; 322 index_t slot; 323 struct rprocpub *rpub; 324 struct rproc *rp; 325 326 if (get_parent_inode(node) != service_node) 327 return; 328 329 slot = get_inode_index(node); 330 rpub = &rproc.pub[slot]; 331 rp = &rproc.proc[slot]; 332 333 /* TODO: add a large number of other fields! */ 334 buf_printf("filename: %s\n", rpub->proc_name); 335 buf_printf("endpoint: %d\n", rpub->endpoint); 336 buf_printf("pid: %d\n", rp->r_pid); 337 buf_printf("restarts: %d\n", rp->r_restarts); 338 buf_printf("flags: %s\n", service_get_flags(slot)); 339 buf_printf("policies: %s\n", service_get_policies(policies, slot)); 340 } 341