13 #include <linux/limits.h>
14 #include <linux/auto_fs4.h>
16 #include <libubox/uloop.h>
17 #include <libubox/utils.h>
18 #include <libubox/vlist.h>
19 #include <libubox/ulog.h>
20 #include <libubox/avl-cmp.h>
23 #include "libfstools/libfstools.h"
25 #define AUTOFS_MOUNT_PATH "/tmp/run/blockd/"
26 #define AUTOFS_TIMEOUT 30
27 #define AUTOFS_EXPIRE_TIMER (5 * 1000)
29 struct hotplug_context
{
30 struct uloop_process process
;
35 struct vlist_node node
;
36 struct blob_attr
*msg
;
43 static struct uloop_fd fd_autofs_read
;
44 static int fd_autofs_write
= 0;
45 static struct ubus_auto_conn conn
;
46 struct blob_buf bb
= { 0 };
61 static const struct blobmsg_policy mount_policy
[__MOUNT_MAX
] = {
62 [MOUNT_UUID
] = { .name
= "uuid", .type
= BLOBMSG_TYPE_STRING
},
63 [MOUNT_LABEL
] = { .name
= "label", .type
= BLOBMSG_TYPE_STRING
},
64 [MOUNT_DEVICE
] = { .name
= "device", .type
= BLOBMSG_TYPE_STRING
},
65 [MOUNT_TARGET
] = { .name
= "target", .type
= BLOBMSG_TYPE_STRING
},
66 [MOUNT_OPTIONS
] = { .name
= "options", .type
= BLOBMSG_TYPE_STRING
},
67 [MOUNT_ENABLE
] = { .name
= "enabled", .type
= BLOBMSG_TYPE_INT32
},
68 [MOUNT_AUTOFS
] = { .name
= "autofs", .type
= BLOBMSG_TYPE_INT32
},
69 [MOUNT_ANON
] = { .name
= "anon", .type
= BLOBMSG_TYPE_INT32
},
70 [MOUNT_REMOVE
] = { .name
= "remove", .type
= BLOBMSG_TYPE_INT32
},
78 static const struct blobmsg_policy info_policy
[__INFO_MAX
] = {
79 [INFO_DEVICE
] = { .name
= "device", .type
= BLOBMSG_TYPE_STRING
},
83 _find_mount_point(char *device
)
87 if (asprintf(&dev
, "/dev/%s", device
) == -1)
90 mp
= find_mount_point(dev
, 0);
97 block(char *cmd
, char *action
, char *device
, int sync
, struct uloop_process
*process
)
102 char *argv
[5] = { 0 };
107 ULOG_ERR("failed to fork block process\n");
113 argv
[a
++] = "/sbin/block";
117 execvp(argv
[0], argv
);
118 ULOG_ERR("failed to spawn %s %s %s\n", *argv
, action
, device
);
122 if (!sync
&& process
) {
124 uloop_process_add(process
);
126 waitpid(pid
, &status
, 0);
127 ret
= WEXITSTATUS(status
);
129 ULOG_ERR("failed to run block. %s/%s\n", action
, device
);
137 static int send_block_notification(struct ubus_context
*ctx
, const char *action
,
138 const char *devname
, const char *target
);
139 static int hotplug_call_mount(struct ubus_context
*ctx
, const char *action
,
140 const char *devname
, uloop_process_handler cb
, void *priv
)
142 char * const argv
[] = { "hotplug-call", "mount", NULL
};
143 struct hotplug_context
*c
= NULL
;
148 c
= calloc(1, sizeof(*c
));
160 ULOG_ERR("fork() failed\n");
165 setenv("ACTION", action
, 1);
166 setenv("DEVICE", devname
, 1);
168 execv("/sbin/hotplug-call", argv
);
173 c
->process
.pid
= pid
;
176 uloop_process_add(&c
->process
);
184 static void device_mount_remove_hotplug_cb(struct uloop_process
*p
, int stat
)
186 struct hotplug_context
*hctx
= container_of(p
, struct hotplug_context
, process
);
187 struct device
*device
= hctx
->priv
;
191 unlink(device
->target
);
193 mp
= _find_mount_point(device
->name
);
195 block("autofs", "remove", device
->name
, 0, NULL
);
203 static void device_mount_remove(struct ubus_context
*ctx
, struct device
*device
)
205 static const char *action
= "remove";
207 hotplug_call_mount(ctx
, action
, device
->name
,
208 device_mount_remove_hotplug_cb
, device
);
210 send_block_notification(ctx
, action
, device
->name
, device
->target
);
213 static void device_mount_add(struct ubus_context
*ctx
, struct device
*device
)
218 if (asprintf(&path
, "/tmp/run/blockd/%s", device
->name
) == -1)
221 if (!lstat(device
->target
, &st
)) {
222 if (S_ISLNK(st
.st_mode
))
223 unlink(device
->target
);
224 else if (S_ISDIR(st
.st_mode
))
225 rmdir(device
->target
);
228 tmp
= strrchr(device
->target
, '/');
229 if (tmp
&& tmp
!= device
->target
&& tmp
!= &device
->target
[strlen(path
)-1]) {
231 mkdir_p(device
->target
, 0755);
235 if (symlink(path
, device
->target
)) {
236 ULOG_ERR("failed to symlink %s->%s (%d) - %m\n", device
->target
, path
, errno
);
238 static const char *action
= "add";
239 hotplug_call_mount(ctx
, action
, device
->name
, NULL
, NULL
);
240 send_block_notification(ctx
, action
, device
->name
, device
->target
);
246 device_move(struct device
*device_o
, struct device
*device_n
)
250 if (device_o
->autofs
!= device_n
->autofs
)
253 if (device_o
->anon
|| device_n
->anon
)
256 if (device_o
->autofs
) {
257 unlink(device_o
->target
);
258 if (asprintf(&path
, "/tmp/run/blockd/%s", device_n
->name
) == -1)
261 if (symlink(path
, device_n
->target
))
262 ULOG_ERR("failed to symlink %s->%s (%d) - %m\n", device_n
->target
, path
, errno
);
266 mkdir(device_n
->target
, 0755);
267 if (mount(device_o
->target
, device_n
->target
, NULL
, MS_MOVE
, NULL
))
268 rmdir(device_n
->target
);
270 rmdir(device_o
->target
);
276 static void vlist_nop_update(struct vlist_tree
*tree
,
277 struct vlist_node
*node_new
,
278 struct vlist_node
*node_old
)
282 VLIST_TREE(devices
, avl_strcmp
, vlist_nop_update
, false, false);
285 block_hotplug(struct ubus_context
*ctx
, struct ubus_object
*obj
,
286 struct ubus_request_data
*req
, const char *method
,
287 struct blob_attr
*msg
)
289 struct blob_attr
*data
[__MOUNT_MAX
];
290 struct device
*device
;
291 struct blob_attr
*_msg
;
292 char *devname
, *_name
;
293 char *target
= NULL
, *__target
;
294 char *_target
= NULL
;
296 blobmsg_parse(mount_policy
, __MOUNT_MAX
, data
, blob_data(msg
), blob_len(msg
));
298 if (!data
[MOUNT_DEVICE
])
299 return UBUS_STATUS_INVALID_ARGUMENT
;
301 devname
= blobmsg_get_string(data
[MOUNT_DEVICE
]);
303 if (data
[MOUNT_TARGET
]) {
304 target
= blobmsg_get_string(data
[MOUNT_TARGET
]);
306 if (asprintf(&_target
, "/mnt/%s",
307 blobmsg_get_string(data
[MOUNT_DEVICE
])) == -1)
313 if (data
[MOUNT_REMOVE
])
314 device
= vlist_find(&devices
, devname
, device
, node
);
316 device
= calloc_a(sizeof(*device
), &_msg
, blob_raw_len(msg
),
317 &_name
, strlen(devname
) + 1, &__target
, strlen(target
) + 1);
323 return UBUS_STATUS_UNKNOWN_ERROR
;
326 if (data
[MOUNT_REMOVE
]) {
327 vlist_delete(&devices
, &device
->node
);
330 device_mount_remove(ctx
, device
);
337 struct device
*old
= vlist_find(&devices
, devname
, device
, node
);
339 device
->autofs
= data
[MOUNT_AUTOFS
] ? blobmsg_get_u32(data
[MOUNT_AUTOFS
]) : 0;
340 device
->anon
= data
[MOUNT_ANON
] ? blobmsg_get_u32(data
[MOUNT_ANON
]) : 0;
342 memcpy(_msg
, msg
, blob_raw_len(msg
));
343 device
->name
= _name
;
344 strcpy(_name
, devname
);
345 device
->target
= __target
;
346 strcpy(__target
, target
);
350 vlist_add(&devices
, &device
->node
, device
->name
);
352 if (old
&& device_move(old
, device
)) {
353 device_mount_remove(ctx
, old
);
354 device_mount_add(ctx
, device
);
356 block("mount", NULL
, NULL
, 0, NULL
);
357 } else if (device
->autofs
) {
358 device_mount_add(ctx
, device
);
365 static int blockd_mount(struct ubus_context
*ctx
, struct ubus_object
*obj
,
366 struct ubus_request_data
*req
, const char *method
,
367 struct blob_attr
*msg
)
369 static const char *action
= "add";
370 struct blob_attr
*data
[__MOUNT_MAX
];
371 struct device
*device
;
374 blobmsg_parse(mount_policy
, __MOUNT_MAX
, data
, blob_data(msg
), blob_len(msg
));
376 if (!data
[MOUNT_DEVICE
])
377 return UBUS_STATUS_INVALID_ARGUMENT
;
379 devname
= blobmsg_get_string(data
[MOUNT_DEVICE
]);
381 device
= vlist_find(&devices
, devname
, device
, node
);
383 return UBUS_STATUS_UNKNOWN_ERROR
;
385 hotplug_call_mount(ctx
, action
, device
->name
, NULL
, NULL
);
386 send_block_notification(ctx
, action
, device
->name
, device
->target
);
391 struct blockd_umount_context
{
392 struct ubus_context
*ctx
;
393 struct ubus_request_data req
;
396 static void blockd_umount_hotplug_cb(struct uloop_process
*p
, int stat
)
398 struct hotplug_context
*hctx
= container_of(p
, struct hotplug_context
, process
);
399 struct blockd_umount_context
*c
= hctx
->priv
;
401 ubus_complete_deferred_request(c
->ctx
, &c
->req
, 0);
407 static int blockd_umount(struct ubus_context
*ctx
, struct ubus_object
*obj
,
408 struct ubus_request_data
*req
, const char *method
,
409 struct blob_attr
*msg
)
411 struct blob_attr
*data
[__MOUNT_MAX
];
412 struct blockd_umount_context
*c
;
413 static const char *action
= "remove";
415 static char oldtarget
[PATH_MAX
];
416 struct device
*device
;
419 blobmsg_parse(mount_policy
, __MOUNT_MAX
, data
, blob_data(msg
), blob_len(msg
));
421 if (!data
[MOUNT_DEVICE
])
422 return UBUS_STATUS_INVALID_ARGUMENT
;
424 devname
= blobmsg_get_string(data
[MOUNT_DEVICE
]);
425 device
= vlist_find(&devices
, devname
, device
, node
);
427 strncpy(oldtarget
, device
->target
, sizeof(oldtarget
)-1);
428 oldtarget
[PATH_MAX
- 1] = '\0';
431 c
= calloc(1, sizeof(*c
));
433 return UBUS_STATUS_UNKNOWN_ERROR
;
436 ubus_defer_request(ctx
, req
, &c
->req
);
438 err
= hotplug_call_mount(ctx
, action
, devname
, blockd_umount_hotplug_cb
, c
);
441 return UBUS_STATUS_UNKNOWN_ERROR
;
444 send_block_notification(ctx
, action
, devname
, oldtarget
);
449 static void block_info_dump(struct blob_buf
*b
, struct device
*device
)
455 blob_for_each_attr(v
, device
->msg
, rem
)
456 blobmsg_add_blob(b
, v
);
458 mp
= _find_mount_point(device
->name
);
460 blobmsg_add_string(b
, "mount", mp
);
462 } else if (device
->autofs
&& device
->target
) {
463 blobmsg_add_string(b
, "mount", device
->target
);
468 block_info(struct ubus_context
*ctx
, struct ubus_object
*obj
,
469 struct ubus_request_data
*req
, const char *method
,
470 struct blob_attr
*msg
)
472 struct blob_attr
*data
[__INFO_MAX
];
473 struct device
*device
= NULL
;
475 blobmsg_parse(info_policy
, __INFO_MAX
, data
, blob_data(msg
), blob_len(msg
));
477 if (data
[INFO_DEVICE
]) {
478 device
= vlist_find(&devices
, blobmsg_get_string(data
[INFO_DEVICE
]), device
, node
);
480 return UBUS_STATUS_INVALID_ARGUMENT
;
483 blob_buf_init(&bb
, 0);
485 block_info_dump(&bb
, device
);
489 a
= blobmsg_open_array(&bb
, "devices");
490 vlist_for_each_element(&devices
, device
, node
) {
493 t
= blobmsg_open_table(&bb
, "");
494 block_info_dump(&bb
, device
);
495 blobmsg_close_table(&bb
, t
);
497 blobmsg_close_array(&bb
, a
);
499 ubus_send_reply(ctx
, req
, bb
.head
);
504 static const struct ubus_method block_methods
[] = {
505 UBUS_METHOD("hotplug", block_hotplug
, mount_policy
),
506 UBUS_METHOD("mount", blockd_mount
, mount_policy
),
507 UBUS_METHOD("umount", blockd_umount
, mount_policy
),
508 UBUS_METHOD("info", block_info
, info_policy
),
511 static struct ubus_object_type block_object_type
=
512 UBUS_OBJECT_TYPE("block", block_methods
);
514 static struct ubus_object block_object
= {
516 .type
= &block_object_type
,
517 .methods
= block_methods
,
518 .n_methods
= ARRAY_SIZE(block_methods
),
521 /* send ubus event for successful mounts, useful for procd triggers */
522 static int send_block_notification(struct ubus_context
*ctx
, const char *action
,
523 const char *devname
, const char *target
)
525 struct blob_buf buf
= { 0 };
526 char evname
[16] = "mount.";
532 strncat(evname
, action
, sizeof(evname
) - 1);
534 blob_buf_init(&buf
, 0);
537 blobmsg_add_string(&buf
, "device", devname
);
540 blobmsg_add_string(&buf
, "target", target
);
542 err
= ubus_notify(ctx
, &block_object
, evname
, buf
.head
, -1);
548 ubus_connect_handler(struct ubus_context
*ctx
)
552 ret
= ubus_add_object(ctx
, &block_object
);
554 fprintf(stderr
, "Failed to add object: %s\n", ubus_strerror(ret
));
557 static int autofs_umount(void)
559 umount2(AUTOFS_MOUNT_PATH
, MNT_DETACH
);
563 static void autofs_read_handler(struct uloop_fd
*u
, unsigned int events
)
565 union autofs_v5_packet_union pktu
;
566 const struct autofs_v5_packet
*pkt
;
567 int cmd
= AUTOFS_IOC_READY
;
570 while (read(u
->fd
, &pktu
, sizeof(pktu
)) == -1) {
576 if (pktu
.hdr
.type
!= autofs_ptype_missing_indirect
) {
577 ULOG_ERR("unknown packet type %d\n", pktu
.hdr
.type
);
581 pkt
= &pktu
.missing_indirect
;
582 ULOG_ERR("kernel is requesting a mount -> %s\n", pkt
->name
);
583 if (lstat(pkt
->name
, &st
) == -1)
584 if (block("autofs", "add", (char *)pkt
->name
, 1, NULL
))
585 cmd
= AUTOFS_IOC_FAIL
;
587 if (ioctl(fd_autofs_write
, cmd
, pkt
->wait_queue_token
) < 0)
588 ULOG_ERR("failed to report back to kernel\n");
591 static void autofs_expire(struct uloop_timeout
*t
)
593 struct autofs_packet_expire pkt
;
595 while (ioctl(fd_autofs_write
, AUTOFS_IOC_EXPIRE
, &pkt
) == 0)
596 block("autofs", "remove", pkt
.name
, 1, NULL
);
598 uloop_timeout_set(t
, AUTOFS_EXPIRE_TIMER
);
601 struct uloop_timeout autofs_expire_timer
= {
605 static int autofs_mount(void)
607 unsigned long autofs_timeout
= AUTOFS_TIMEOUT
;
613 if (pipe(pipefd
) < 0) {
614 ULOG_ERR("failed to get kernel pipe\n");
618 snprintf(source
, sizeof(source
), "mountd(pid%u)", getpid());
619 snprintf(opts
, sizeof(opts
), "fd=%d,pgrp=%u,minproto=5,maxproto=5", pipefd
[1], (unsigned) getpgrp());
620 mkdir(AUTOFS_MOUNT_PATH
, 0555);
621 if (mount(source
, AUTOFS_MOUNT_PATH
, "autofs", 0, opts
)) {
622 ULOG_ERR("unable to mount autofs on %s\n", AUTOFS_MOUNT_PATH
);
628 fd_autofs_read
.fd
= pipefd
[0];
629 fd_autofs_read
.cb
= autofs_read_handler
;
630 uloop_fd_add(&fd_autofs_read
, ULOOP_READ
);
632 fd_autofs_write
= open(AUTOFS_MOUNT_PATH
, O_RDONLY
);
633 if(fd_autofs_write
< 0) {
635 ULOG_ERR("failed to open direcory\n");
639 ioctl(fd_autofs_write
, AUTOFS_IOC_PROTOVER
, &kproto_version
);
640 if (kproto_version
!= 5) {
641 ULOG_ERR("only kernel protocol version 5 is tested. You have %d.\n",
645 if (ioctl(fd_autofs_write
, AUTOFS_IOC_SETTIMEOUT
, &autofs_timeout
))
646 ULOG_ERR("failed to set autofs timeout\n");
648 uloop_timeout_set(&autofs_expire_timer
, AUTOFS_EXPIRE_TIMER
);
650 fcntl(fd_autofs_write
, F_SETFD
, fcntl(fd_autofs_write
, F_GETFD
) | FD_CLOEXEC
);
651 fcntl(fd_autofs_read
.fd
, F_SETFD
, fcntl(fd_autofs_read
.fd
, F_GETFD
) | FD_CLOEXEC
);
656 static void blockd_startup_cb(struct uloop_process
*p
, int stat
)
658 send_block_notification(&conn
.ctx
, "ready", NULL
, NULL
);
661 static struct uloop_process startup_process
= {
662 .cb
= blockd_startup_cb
,
665 static void blockd_startup(struct uloop_timeout
*t
)
667 block("autofs", "start", NULL
, 0, &startup_process
);
670 struct uloop_timeout startup
= {
671 .cb
= blockd_startup
,
674 int main(int argc
, char **argv
)
676 /* make sure blockd is in it's own POSIX process group */
679 ulog_open(ULOG_SYSLOG
| ULOG_STDIO
, LOG_DAEMON
, "blockd");
684 conn
.cb
= ubus_connect_handler
;
685 ubus_auto_connect(&conn
);
687 uloop_timeout_set(&startup
, 1000);
694 vlist_flush_all(&devices
);