13 #include <linux/limits.h>
14 #include <linux/auto_fs4.h>
16 #include <libubox/uloop.h>
17 #include <libubox/vlist.h>
18 #include <libubox/ulog.h>
19 #include <libubox/avl-cmp.h>
22 #include "libfstools/libfstools.h"
24 #define AUTOFS_MOUNT_PATH "/tmp/run/blockd/"
25 #define AUTOFS_TIMEOUT 30
26 #define AUTOFS_EXPIRE_TIMER (5 * 1000)
28 struct hotplug_context
{
29 struct uloop_process process
;
34 struct vlist_node node
;
35 struct blob_attr
*msg
;
42 static struct uloop_fd fd_autofs_read
;
43 static int fd_autofs_write
= 0;
44 static struct ubus_auto_conn conn
;
45 struct blob_buf bb
= { 0 };
60 static const struct blobmsg_policy mount_policy
[__MOUNT_MAX
] = {
61 [MOUNT_UUID
] = { .name
= "uuid", .type
= BLOBMSG_TYPE_STRING
},
62 [MOUNT_LABEL
] = { .name
= "label", .type
= BLOBMSG_TYPE_STRING
},
63 [MOUNT_DEVICE
] = { .name
= "device", .type
= BLOBMSG_TYPE_STRING
},
64 [MOUNT_TARGET
] = { .name
= "target", .type
= BLOBMSG_TYPE_STRING
},
65 [MOUNT_OPTIONS
] = { .name
= "options", .type
= BLOBMSG_TYPE_STRING
},
66 [MOUNT_ENABLE
] = { .name
= "enabled", .type
= BLOBMSG_TYPE_INT32
},
67 [MOUNT_AUTOFS
] = { .name
= "autofs", .type
= BLOBMSG_TYPE_INT32
},
68 [MOUNT_ANON
] = { .name
= "anon", .type
= BLOBMSG_TYPE_INT32
},
69 [MOUNT_REMOVE
] = { .name
= "remove", .type
= BLOBMSG_TYPE_INT32
},
77 static const struct blobmsg_policy info_policy
[__INFO_MAX
] = {
78 [INFO_DEVICE
] = { .name
= "device", .type
= BLOBMSG_TYPE_STRING
},
82 _find_mount_point(char *device
)
86 snprintf(dev
, sizeof(dev
), "/dev/%s", device
);
88 return find_mount_point(dev
, 0);
92 block(char *cmd
, char *action
, char *device
)
97 char *argv
[5] = { 0 };
102 ULOG_ERR("failed to fork block process\n");
106 argv
[a
++] = "/sbin/block";
110 execvp(argv
[0], argv
);
111 ULOG_ERR("failed to spawn %s %s %s\n", *argv
, action
, device
);
115 waitpid(pid
, &status
, 0);
116 ret
= WEXITSTATUS(status
);
118 ULOG_ERR("failed to run block. %s/%s\n", action
, device
);
125 static int hotplug_call_mount(const char *action
, const char *devname
,
126 uloop_process_handler cb
, void *priv
)
128 char * const argv
[] = { "hotplug-call", "mount", NULL
};
129 struct hotplug_context
*c
= NULL
;
134 c
= calloc(1, sizeof(*c
));
143 ULOG_ERR("fork() failed\n");
148 setenv("ACTION", action
, 1);
149 setenv("DEVICE", devname
, 1);
151 execv("/sbin/hotplug-call", argv
);
156 c
->process
.pid
= pid
;
159 uloop_process_add(&c
->process
);
167 static void device_mount_remove_hotplug_cb(struct uloop_process
*p
, int stat
)
169 struct hotplug_context
*hctx
= container_of(p
, struct hotplug_context
, process
);
170 struct device
*device
= hctx
->priv
;
174 unlink(device
->target
);
176 mp
= _find_mount_point(device
->name
);
178 block("autofs", "remove", device
->name
);
186 static void device_mount_remove(struct device
*device
)
188 hotplug_call_mount("remove", device
->name
,
189 device_mount_remove_hotplug_cb
, device
);
192 static void device_mount_add(struct device
*device
)
197 snprintf(path
, sizeof(path
), "/tmp/run/blockd/%s", device
->name
);
198 if (!lstat(device
->target
, &st
)) {
199 if (S_ISLNK(st
.st_mode
))
200 unlink(device
->target
);
201 else if (S_ISDIR(st
.st_mode
))
202 rmdir(device
->target
);
204 if (symlink(path
, device
->target
))
205 ULOG_ERR("failed to symlink %s->%s (%d) - %m\n", device
->target
, path
, errno
);
207 hotplug_call_mount("add", device
->name
, NULL
, NULL
);
211 device_move(struct device
*device_o
, struct device
*device_n
)
215 if (device_o
->autofs
!= device_n
->autofs
)
218 if (device_o
->anon
|| device_n
->anon
)
221 if (device_o
->autofs
) {
222 unlink(device_o
->target
);
223 snprintf(path
, sizeof(path
), "/tmp/run/blockd/%s", device_n
->name
);
224 if (symlink(path
, device_n
->target
))
225 ULOG_ERR("failed to symlink %s->%s (%d) - %m\n", device_n
->target
, path
, errno
);
227 mkdir(device_n
->target
, 0755);
228 if (mount(device_o
->target
, device_n
->target
, NULL
, MS_MOVE
, NULL
))
229 rmdir(device_n
->target
);
231 rmdir(device_o
->target
);
237 static void vlist_nop_update(struct vlist_tree
*tree
,
238 struct vlist_node
*node_new
,
239 struct vlist_node
*node_old
)
243 VLIST_TREE(devices
, avl_strcmp
, vlist_nop_update
, false, false);
246 block_hotplug(struct ubus_context
*ctx
, struct ubus_object
*obj
,
247 struct ubus_request_data
*req
, const char *method
,
248 struct blob_attr
*msg
)
250 struct blob_attr
*data
[__MOUNT_MAX
];
251 struct device
*device
;
252 struct blob_attr
*_msg
;
253 char *devname
, *_name
;
254 char *target
= NULL
, *__target
;
257 blobmsg_parse(mount_policy
, __MOUNT_MAX
, data
, blob_data(msg
), blob_len(msg
));
259 if (!data
[MOUNT_DEVICE
])
260 return UBUS_STATUS_INVALID_ARGUMENT
;
262 devname
= blobmsg_get_string(data
[MOUNT_DEVICE
]);
264 if (data
[MOUNT_TARGET
]) {
265 target
= blobmsg_get_string(data
[MOUNT_TARGET
]);
267 snprintf(_target
, sizeof(_target
), "/mnt/%s",
268 blobmsg_get_string(data
[MOUNT_DEVICE
]));
272 if (data
[MOUNT_REMOVE
])
273 device
= vlist_find(&devices
, devname
, device
, node
);
275 device
= calloc_a(sizeof(*device
), &_msg
, blob_raw_len(msg
),
276 &_name
, strlen(devname
) + 1, &__target
, strlen(target
) + 1);
279 return UBUS_STATUS_UNKNOWN_ERROR
;
281 if (data
[MOUNT_REMOVE
]) {
282 vlist_delete(&devices
, &device
->node
);
285 device_mount_remove(device
);
289 struct device
*old
= vlist_find(&devices
, devname
, device
, node
);
291 device
->autofs
= data
[MOUNT_AUTOFS
] ? blobmsg_get_u32(data
[MOUNT_AUTOFS
]) : 0;
292 device
->anon
= data
[MOUNT_ANON
] ? blobmsg_get_u32(data
[MOUNT_ANON
]) : 0;
294 memcpy(_msg
, msg
, blob_raw_len(msg
));
295 device
->name
= _name
;
296 strcpy(_name
, devname
);
297 device
->target
= __target
;
298 strcpy(__target
, target
);
300 vlist_add(&devices
, &device
->node
, device
->name
);
302 if (old
&& !device_move(old
, device
)) {
303 if (device
->autofs
) {
304 device_mount_remove(old
);
305 device_mount_add(device
);
307 block("mount", NULL
, NULL
);
309 } else if (device
->autofs
) {
310 device_mount_add(device
);
317 static int blockd_mount(struct ubus_context
*ctx
, struct ubus_object
*obj
,
318 struct ubus_request_data
*req
, const char *method
,
319 struct blob_attr
*msg
)
321 struct blob_attr
*data
[__MOUNT_MAX
];
322 struct device
*device
;
325 blobmsg_parse(mount_policy
, __MOUNT_MAX
, data
, blob_data(msg
), blob_len(msg
));
327 if (!data
[MOUNT_DEVICE
])
328 return UBUS_STATUS_INVALID_ARGUMENT
;
330 devname
= blobmsg_get_string(data
[MOUNT_DEVICE
]);
332 device
= vlist_find(&devices
, devname
, device
, node
);
334 return UBUS_STATUS_UNKNOWN_ERROR
;
336 hotplug_call_mount("add", device
->name
, NULL
, NULL
);
341 struct blockd_umount_context
{
342 struct ubus_context
*ctx
;
343 struct ubus_request_data req
;
346 static void blockd_umount_hotplug_cb(struct uloop_process
*p
, int stat
)
348 struct hotplug_context
*hctx
= container_of(p
, struct hotplug_context
, process
);
349 struct blockd_umount_context
*c
= hctx
->priv
;
351 ubus_complete_deferred_request(c
->ctx
, &c
->req
, 0);
357 static int blockd_umount(struct ubus_context
*ctx
, struct ubus_object
*obj
,
358 struct ubus_request_data
*req
, const char *method
,
359 struct blob_attr
*msg
)
361 struct blob_attr
*data
[__MOUNT_MAX
];
362 struct blockd_umount_context
*c
;
366 blobmsg_parse(mount_policy
, __MOUNT_MAX
, data
, blob_data(msg
), blob_len(msg
));
368 if (!data
[MOUNT_DEVICE
])
369 return UBUS_STATUS_INVALID_ARGUMENT
;
371 devname
= blobmsg_get_string(data
[MOUNT_DEVICE
]);
373 c
= calloc(1, sizeof(*c
));
375 return UBUS_STATUS_UNKNOWN_ERROR
;
378 ubus_defer_request(ctx
, req
, &c
->req
);
380 err
= hotplug_call_mount("remove", devname
, blockd_umount_hotplug_cb
, c
);
383 return UBUS_STATUS_UNKNOWN_ERROR
;
389 static void block_info_dump(struct blob_buf
*b
, struct device
*device
)
395 blob_for_each_attr(v
, device
->msg
, rem
)
396 blobmsg_add_blob(b
, v
);
398 mp
= _find_mount_point(device
->name
);
400 blobmsg_add_string(b
, "mount", mp
);
402 } else if (device
->autofs
&& device
->target
) {
403 blobmsg_add_string(b
, "mount", device
->target
);
408 block_info(struct ubus_context
*ctx
, struct ubus_object
*obj
,
409 struct ubus_request_data
*req
, const char *method
,
410 struct blob_attr
*msg
)
412 struct blob_attr
*data
[__INFO_MAX
];
413 struct device
*device
= NULL
;
415 blobmsg_parse(info_policy
, __INFO_MAX
, data
, blob_data(msg
), blob_len(msg
));
417 if (data
[INFO_DEVICE
]) {
418 device
= vlist_find(&devices
, blobmsg_get_string(data
[INFO_DEVICE
]), device
, node
);
420 return UBUS_STATUS_INVALID_ARGUMENT
;
423 blob_buf_init(&bb
, 0);
425 block_info_dump(&bb
, device
);
429 a
= blobmsg_open_array(&bb
, "devices");
430 vlist_for_each_element(&devices
, device
, node
) {
433 t
= blobmsg_open_table(&bb
, "");
434 block_info_dump(&bb
, device
);
435 blobmsg_close_table(&bb
, t
);
437 blobmsg_close_array(&bb
, a
);
439 ubus_send_reply(ctx
, req
, bb
.head
);
444 static const struct ubus_method block_methods
[] = {
445 UBUS_METHOD("hotplug", block_hotplug
, mount_policy
),
446 UBUS_METHOD("mount", blockd_mount
, mount_policy
),
447 UBUS_METHOD("umount", blockd_umount
, mount_policy
),
448 UBUS_METHOD("info", block_info
, info_policy
),
451 static struct ubus_object_type block_object_type
=
452 UBUS_OBJECT_TYPE("block", block_methods
);
454 static struct ubus_object block_object
= {
456 .type
= &block_object_type
,
457 .methods
= block_methods
,
458 .n_methods
= ARRAY_SIZE(block_methods
),
462 ubus_connect_handler(struct ubus_context
*ctx
)
466 ret
= ubus_add_object(ctx
, &block_object
);
468 fprintf(stderr
, "Failed to add object: %s\n", ubus_strerror(ret
));
471 static int autofs_umount(void)
473 umount2(AUTOFS_MOUNT_PATH
, MNT_DETACH
);
477 static void autofs_read_handler(struct uloop_fd
*u
, unsigned int events
)
479 union autofs_v5_packet_union pktu
;
480 const struct autofs_v5_packet
*pkt
;
481 int cmd
= AUTOFS_IOC_READY
;
484 while (read(u
->fd
, &pktu
, sizeof(pktu
)) == -1) {
490 if (pktu
.hdr
.type
!= autofs_ptype_missing_indirect
) {
491 ULOG_ERR("unknown packet type %d\n", pktu
.hdr
.type
);
495 pkt
= &pktu
.missing_indirect
;
496 ULOG_ERR("kernel is requesting a mount -> %s\n", pkt
->name
);
497 if (lstat(pkt
->name
, &st
) == -1)
498 if (block("autofs", "add", (char *)pkt
->name
))
499 cmd
= AUTOFS_IOC_FAIL
;
501 if (ioctl(fd_autofs_write
, cmd
, pkt
->wait_queue_token
) < 0)
502 ULOG_ERR("failed to report back to kernel\n");
505 static void autofs_expire(struct uloop_timeout
*t
)
507 struct autofs_packet_expire pkt
;
509 while (ioctl(fd_autofs_write
, AUTOFS_IOC_EXPIRE
, &pkt
) == 0)
510 block("autofs", "remove", pkt
.name
);
512 uloop_timeout_set(t
, AUTOFS_EXPIRE_TIMER
);
515 struct uloop_timeout autofs_expire_timer
= {
519 static int autofs_mount(void)
521 int autofs_timeout
= AUTOFS_TIMEOUT
;
527 if (pipe(pipefd
) < 0) {
528 ULOG_ERR("failed to get kernel pipe\n");
532 snprintf(source
, sizeof(source
), "mountd(pid%u)", getpid());
533 snprintf(opts
, sizeof(opts
), "fd=%d,pgrp=%u,minproto=5,maxproto=5", pipefd
[1], (unsigned) getpgrp());
534 mkdir(AUTOFS_MOUNT_PATH
, 0555);
535 if (mount(source
, AUTOFS_MOUNT_PATH
, "autofs", 0, opts
)) {
536 ULOG_ERR("unable to mount autofs on %s\n", AUTOFS_MOUNT_PATH
);
542 fd_autofs_read
.fd
= pipefd
[0];
543 fd_autofs_read
.cb
= autofs_read_handler
;
544 uloop_fd_add(&fd_autofs_read
, ULOOP_READ
);
546 fd_autofs_write
= open(AUTOFS_MOUNT_PATH
, O_RDONLY
);
547 if(fd_autofs_write
< 0) {
549 ULOG_ERR("failed to open direcory\n");
553 ioctl(fd_autofs_write
, AUTOFS_IOC_PROTOVER
, &kproto_version
);
554 if (kproto_version
!= 5) {
555 ULOG_ERR("only kernel protocol version 5 is tested. You have %d.\n",
559 if (ioctl(fd_autofs_write
, AUTOFS_IOC_SETTIMEOUT
, &autofs_timeout
))
560 ULOG_ERR("failed to set autofs timeout\n");
562 uloop_timeout_set(&autofs_expire_timer
, AUTOFS_EXPIRE_TIMER
);
564 fcntl(fd_autofs_write
, F_SETFD
, fcntl(fd_autofs_write
, F_GETFD
) | FD_CLOEXEC
);
565 fcntl(fd_autofs_read
.fd
, F_SETFD
, fcntl(fd_autofs_read
.fd
, F_GETFD
) | FD_CLOEXEC
);
570 static void blockd_startup(struct uloop_timeout
*t
)
572 block("autofs", "start", NULL
);
575 struct uloop_timeout startup
= {
576 .cb
= blockd_startup
,
579 int main(int argc
, char **argv
)
581 ulog_open(ULOG_SYSLOG
| ULOG_STDIO
, LOG_DAEMON
, "blockd");
586 conn
.cb
= ubus_connect_handler
;
587 ubus_auto_connect(&conn
);
589 uloop_timeout_set(&startup
, 1000);
596 vlist_flush_all(&devices
);