Commit | Line | Data |
---|---|---|
baf20995 MD |
1 | /* |
2 | * ltt-debugfs-abi.c | |
3 | * | |
4 | * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * LTTng debugfs ABI | |
7 | * | |
8 | * Mimic system calls for: | |
9 | * - session creation, returns a file descriptor or failure. | |
ad1c05e1 MD |
10 | * - channel creation, returns a file descriptor or failure. |
11 | * - Operates on a session file descriptor | |
12 | * - Takes all channel options as parameters. | |
13 | * - stream get, returns a file descriptor or failure. | |
14 | * - Operates on a channel file descriptor. | |
15 | * - stream notifier get, returns a file descriptor or failure. | |
16 | * - Operates on a channel file descriptor. | |
17 | * - event creation, returns a file descriptor or failure. | |
18 | * - Operates on a channel file descriptor | |
19 | * - Takes an event name as parameter | |
20 | * - Takes an instrumentation source as parameter | |
21 | * - e.g. tracepoints, dynamic_probes... | |
22 | * - Takes instrumentation source specific arguments. | |
baf20995 MD |
23 | */ |
24 | ||
11b5a3c2 | 25 | #include <linux/module.h> |
baf20995 | 26 | #include <linux/debugfs.h> |
11b5a3c2 MD |
27 | #include <linux/anon_inodes.h> |
28 | #include <linux/file.h> | |
29 | #include <linux/uaccess.h> | |
30 | #include <linux/slab.h> | |
b13f3ebe | 31 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
f3bc08c5 | 32 | #include "wrapper/ringbuffer/vfs.h" |
11b5a3c2 | 33 | #include "ltt-debugfs-abi.h" |
ad1c05e1 | 34 | #include "ltt-events.h" |
baf20995 MD |
35 | |
36 | /* | |
37 | * This is LTTng's own personal way to create a system call as an external | |
38 | * module. We use ioctl() on /sys/kernel/debug/lttng. | |
39 | */ | |
40 | ||
41 | static struct dentry *lttng_dentry; | |
ad1c05e1 MD |
42 | static const struct file_operations lttng_fops; |
43 | static const struct file_operations lttng_session_fops; | |
44 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 45 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 46 | static const struct file_operations lttng_event_fops; |
baf20995 | 47 | |
5dbbdb43 MD |
48 | enum channel_type { |
49 | PER_CPU_CHANNEL, | |
5dbbdb43 MD |
50 | METADATA_CHANNEL, |
51 | }; | |
52 | ||
ad1c05e1 | 53 | static |
baf20995 MD |
54 | int lttng_abi_create_session(void) |
55 | { | |
56 | struct ltt_session *session; | |
c0e31d2e | 57 | struct file *session_file; |
11b5a3c2 | 58 | int session_fd, ret; |
baf20995 | 59 | |
653fe716 | 60 | session = ltt_session_create(); |
baf20995 MD |
61 | if (!session) |
62 | return -ENOMEM; | |
1c25284c | 63 | session_fd = get_unused_fd(); |
baf20995 MD |
64 | if (session_fd < 0) { |
65 | ret = session_fd; | |
66 | goto fd_error; | |
67 | } | |
c0e31d2e | 68 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 69 | <tng_session_fops, |
baf20995 | 70 | session, O_RDWR); |
c0e31d2e MD |
71 | if (IS_ERR(session_file)) { |
72 | ret = PTR_ERR(session_file); | |
baf20995 MD |
73 | goto file_error; |
74 | } | |
c0e31d2e MD |
75 | session->file = session_file; |
76 | fd_install(session_fd, session_file); | |
baf20995 MD |
77 | return session_fd; |
78 | ||
79 | file_error: | |
80 | put_unused_fd(session_fd); | |
81 | fd_error: | |
82 | ltt_session_destroy(session); | |
83 | return ret; | |
84 | } | |
85 | ||
ad1c05e1 MD |
86 | /** |
87 | * lttng_ioctl - lttng syscall through ioctl | |
88 | * | |
c0e31d2e | 89 | * @file: the file |
ad1c05e1 MD |
90 | * @cmd: the command |
91 | * @arg: command arg | |
92 | * | |
93 | * This ioctl implements lttng commands: | |
38d024ae | 94 | * LTTNG_KERNEL_SESSION |
ad1c05e1 MD |
95 | * Returns a LTTng trace session file descriptor |
96 | * | |
97 | * The returned session will be deleted when its file descriptor is closed. | |
98 | */ | |
99 | static | |
c0e31d2e | 100 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
101 | { |
102 | switch (cmd) { | |
38d024ae | 103 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 MD |
104 | return lttng_abi_create_session(); |
105 | default: | |
106 | return -ENOIOCTLCMD; | |
107 | } | |
108 | } | |
109 | ||
ad1c05e1 MD |
110 | static const struct file_operations lttng_fops = { |
111 | .unlocked_ioctl = lttng_ioctl, | |
112 | #ifdef CONFIG_COMPAT | |
03037b98 | 113 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 114 | #endif |
11b5a3c2 | 115 | }; |
ad1c05e1 | 116 | |
5dbbdb43 MD |
117 | /* |
118 | * We tolerate no failure in this function (if one happens, we print a dmesg | |
119 | * error, but cannot return any error, because the channel information is | |
120 | * invariant. | |
121 | */ | |
122 | static | |
123 | void lttng_metadata_create_events(struct file *channel_file) | |
124 | { | |
125 | struct ltt_channel *channel = channel_file->private_data; | |
cd4bd11f | 126 | char *event_name = "lttng_metadata"; |
85a9ca7f | 127 | const struct lttng_event_desc *event_desc; |
5dbbdb43 MD |
128 | struct ltt_event *event; |
129 | int ret; | |
5dbbdb43 | 130 | |
85a9ca7f MD |
131 | event_desc = ltt_event_get(event_name); |
132 | if (!event_desc) { | |
5dbbdb43 | 133 | ret = -ENOENT; |
85a9ca7f | 134 | goto get_error; |
5dbbdb43 MD |
135 | } |
136 | /* | |
137 | * We tolerate no failure path after event creation. It will stay | |
138 | * invariant for the rest of the session. | |
139 | */ | |
38d024ae | 140 | event = ltt_event_create(channel, event_name, LTTNG_KERNEL_TRACEPOINTS, |
85a9ca7f | 141 | event_desc, NULL); |
5dbbdb43 | 142 | if (!event) { |
85a9ca7f | 143 | goto create_error; |
5dbbdb43 MD |
144 | ret = -EEXIST; |
145 | } | |
146 | return; | |
147 | ||
85a9ca7f MD |
148 | create_error: |
149 | ltt_event_put(event_desc); | |
150 | get_error: | |
5dbbdb43 MD |
151 | WARN_ON(1); |
152 | return; /* not allowed to return error */ | |
153 | } | |
154 | ||
155 | static | |
c0e31d2e | 156 | int lttng_abi_create_channel(struct file *session_file, |
38d024ae | 157 | struct lttng_kernel_channel __user *uchan_param, |
5dbbdb43 | 158 | enum channel_type channel_type) |
baf20995 | 159 | { |
c0e31d2e | 160 | struct ltt_session *session = session_file->private_data; |
5dbbdb43 MD |
161 | const struct file_operations *fops; |
162 | const char *transport_name; | |
baf20995 | 163 | struct ltt_channel *chan; |
c0e31d2e | 164 | struct file *chan_file; |
38d024ae | 165 | struct lttng_kernel_channel chan_param; |
baf20995 | 166 | int chan_fd; |
ad1c05e1 | 167 | int ret = 0; |
baf20995 | 168 | |
653fe716 | 169 | if (copy_from_user(&chan_param, uchan_param, sizeof(chan_param))) |
baf20995 | 170 | return -EFAULT; |
1c25284c | 171 | chan_fd = get_unused_fd(); |
baf20995 MD |
172 | if (chan_fd < 0) { |
173 | ret = chan_fd; | |
174 | goto fd_error; | |
175 | } | |
c0e31d2e | 176 | chan_file = anon_inode_getfile("[lttng_channel]", |
ad1c05e1 | 177 | <tng_channel_fops, |
03037b98 | 178 | NULL, O_RDWR); |
c0e31d2e MD |
179 | if (IS_ERR(chan_file)) { |
180 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
181 | goto file_error; |
182 | } | |
5dbbdb43 MD |
183 | switch (channel_type) { |
184 | case PER_CPU_CHANNEL: | |
185 | transport_name = chan_param.overwrite ? | |
186 | "relay-overwrite" : "relay-discard"; | |
187 | fops = <tng_channel_fops; | |
188 | break; | |
5dbbdb43 | 189 | case METADATA_CHANNEL: |
881833e3 | 190 | transport_name = "relay-metadata"; |
5dbbdb43 MD |
191 | fops = <tng_metadata_fops; |
192 | break; | |
193 | default: | |
194 | transport_name = "<unknown>"; | |
195 | break; | |
196 | } | |
03037b98 MD |
197 | /* |
198 | * We tolerate no failure path after channel creation. It will stay | |
199 | * invariant for the rest of the session. | |
200 | */ | |
5dbbdb43 | 201 | chan = ltt_channel_create(session, transport_name, NULL, |
11b5a3c2 MD |
202 | chan_param.subbuf_size, |
203 | chan_param.num_subbuf, | |
204 | chan_param.switch_timer_interval, | |
205 | chan_param.read_timer_interval); | |
03037b98 | 206 | if (!chan) { |
f3d01b96 | 207 | ret = -EINVAL; |
03037b98 MD |
208 | goto chan_error; |
209 | } | |
11b5a3c2 | 210 | chan->file = chan_file; |
c0e31d2e MD |
211 | chan_file->private_data = chan; |
212 | fd_install(chan_fd, chan_file); | |
cd4bd11f | 213 | if (channel_type == METADATA_CHANNEL) { |
5dbbdb43 | 214 | lttng_metadata_create_events(chan_file); |
cd4bd11f MD |
215 | session->metadata = chan; |
216 | } | |
5dbbdb43 | 217 | |
ad1c05e1 | 218 | /* The channel created holds a reference on the session */ |
b0caa15a | 219 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 220 | |
baf20995 MD |
221 | return chan_fd; |
222 | ||
03037b98 | 223 | chan_error: |
c0e31d2e | 224 | fput(chan_file); |
baf20995 MD |
225 | file_error: |
226 | put_unused_fd(chan_fd); | |
227 | fd_error: | |
baf20995 MD |
228 | return ret; |
229 | } | |
230 | ||
231 | /** | |
ad1c05e1 | 232 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 233 | * |
c0e31d2e | 234 | * @file: the file |
baf20995 MD |
235 | * @cmd: the command |
236 | * @arg: command arg | |
237 | * | |
238 | * This ioctl implements lttng commands: | |
38d024ae | 239 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 240 | * Returns a LTTng channel file descriptor |
ad1c05e1 MD |
241 | * |
242 | * The returned channel will be deleted when its file descriptor is closed. | |
243 | */ | |
244 | static | |
c0e31d2e | 245 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 246 | { |
c0e31d2e MD |
247 | struct ltt_session *session = file->private_data; |
248 | ||
ad1c05e1 | 249 | switch (cmd) { |
38d024ae | 250 | case LTTNG_KERNEL_CHANNEL: |
5dbbdb43 | 251 | return lttng_abi_create_channel(file, |
38d024ae | 252 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 253 | PER_CPU_CHANNEL); |
38d024ae | 254 | case LTTNG_KERNEL_SESSION_START: |
c0e31d2e | 255 | return ltt_session_start(session); |
38d024ae | 256 | case LTTNG_KERNEL_SESSION_STOP: |
c0e31d2e | 257 | return ltt_session_stop(session); |
38d024ae | 258 | case LTTNG_KERNEL_METADATA: |
5dbbdb43 | 259 | return lttng_abi_create_channel(file, |
38d024ae | 260 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 261 | METADATA_CHANNEL); |
ad1c05e1 MD |
262 | default: |
263 | return -ENOIOCTLCMD; | |
264 | } | |
265 | } | |
266 | ||
03037b98 MD |
267 | /* |
268 | * Called when the last file reference is dropped. | |
269 | * | |
270 | * Big fat note: channels and events are invariant for the whole session after | |
271 | * their creation. So this session destruction also destroys all channel and | |
272 | * event structures specific to this session (they are not destroyed when their | |
273 | * individual file is released). | |
274 | */ | |
ad1c05e1 | 275 | static |
03037b98 | 276 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 277 | { |
03037b98 | 278 | struct ltt_session *session = file->private_data; |
c269fff4 MD |
279 | |
280 | if (session) | |
281 | ltt_session_destroy(session); | |
11b5a3c2 | 282 | return 0; |
ad1c05e1 | 283 | } |
ad1c05e1 MD |
284 | |
285 | static const struct file_operations lttng_session_fops = { | |
03037b98 | 286 | .release = lttng_session_release, |
ad1c05e1 MD |
287 | .unlocked_ioctl = lttng_session_ioctl, |
288 | #ifdef CONFIG_COMPAT | |
03037b98 | 289 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 290 | #endif |
11b5a3c2 | 291 | }; |
ad1c05e1 MD |
292 | |
293 | static | |
c0e31d2e | 294 | int lttng_abi_open_stream(struct file *channel_file) |
ad1c05e1 | 295 | { |
c0e31d2e | 296 | struct ltt_channel *channel = channel_file->private_data; |
ad1c05e1 MD |
297 | struct lib_ring_buffer *buf; |
298 | int stream_fd, ret; | |
11b5a3c2 | 299 | struct file *stream_file; |
ad1c05e1 | 300 | |
11b5a3c2 | 301 | buf = channel->ops->buffer_read_open(channel->chan); |
ad1c05e1 MD |
302 | if (!buf) |
303 | return -ENOENT; | |
304 | ||
1c25284c | 305 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
306 | if (stream_fd < 0) { |
307 | ret = stream_fd; | |
308 | goto fd_error; | |
309 | } | |
c0e31d2e | 310 | stream_file = anon_inode_getfile("[lttng_stream]", |
7f57c73c | 311 | &lib_ring_buffer_file_operations, |
ad1c05e1 | 312 | buf, O_RDWR); |
c0e31d2e MD |
313 | if (IS_ERR(stream_file)) { |
314 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
315 | goto file_error; |
316 | } | |
409453cb MD |
317 | /* |
318 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
319 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
320 | * file descriptor, so we set FMODE_PREAD here. | |
321 | */ | |
d7b6f197 | 322 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 323 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
324 | /* |
325 | * The stream holds a reference to the channel within the generic ring | |
326 | * buffer library, so no need to hold a refcount on the channel and | |
327 | * session files here. | |
328 | */ | |
ad1c05e1 MD |
329 | return stream_fd; |
330 | ||
331 | file_error: | |
332 | put_unused_fd(stream_fd); | |
333 | fd_error: | |
11b5a3c2 | 334 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
335 | return ret; |
336 | } | |
337 | ||
653fe716 | 338 | static |
c0e31d2e | 339 | int lttng_abi_create_event(struct file *channel_file, |
38d024ae | 340 | struct lttng_kernel_event __user *uevent_param) |
653fe716 | 341 | { |
c0e31d2e | 342 | struct ltt_channel *channel = channel_file->private_data; |
85a9ca7f | 343 | const struct lttng_event_desc *event_desc; |
653fe716 MD |
344 | struct ltt_event *event; |
345 | char *event_name; | |
38d024ae | 346 | struct lttng_kernel_event event_param; |
653fe716 | 347 | int event_fd, ret; |
11b5a3c2 | 348 | struct file *event_file; |
653fe716 MD |
349 | |
350 | if (copy_from_user(&event_param, uevent_param, sizeof(event_param))) | |
351 | return -EFAULT; | |
352 | event_name = kmalloc(PATH_MAX, GFP_KERNEL); | |
353 | if (!event_name) | |
354 | return -ENOMEM; | |
981616e8 | 355 | if (strncpy_from_user(event_name, uevent_param->name, PATH_MAX) < 0) { |
653fe716 MD |
356 | ret = -EFAULT; |
357 | goto name_error; | |
358 | } | |
359 | event_name[PATH_MAX - 1] = '\0'; | |
dda6a249 | 360 | |
85a9ca7f MD |
361 | event_desc = ltt_event_get(event_name); |
362 | if (!event_desc) { | |
dda6a249 | 363 | ret = -ENOENT; |
85a9ca7f | 364 | goto get_error; |
dda6a249 | 365 | } |
1c25284c | 366 | event_fd = get_unused_fd(); |
653fe716 MD |
367 | if (event_fd < 0) { |
368 | ret = event_fd; | |
369 | goto fd_error; | |
370 | } | |
c0e31d2e | 371 | event_file = anon_inode_getfile("[lttng_event]", |
3b923e5b | 372 | <tng_event_fops, |
03037b98 | 373 | NULL, O_RDWR); |
c0e31d2e MD |
374 | if (IS_ERR(event_file)) { |
375 | ret = PTR_ERR(event_file); | |
653fe716 MD |
376 | goto file_error; |
377 | } | |
03037b98 MD |
378 | /* |
379 | * We tolerate no failure path after event creation. It will stay | |
380 | * invariant for the rest of the session. | |
381 | */ | |
38d024ae | 382 | event = ltt_event_create(channel, event_name, event_param.instrumentation, |
85a9ca7f | 383 | event_desc, NULL); |
03037b98 MD |
384 | if (!event) { |
385 | goto event_error; | |
386 | ret = -EEXIST; | |
387 | } | |
c0e31d2e MD |
388 | event_file->private_data = event; |
389 | fd_install(event_fd, event_file); | |
653fe716 | 390 | /* The event holds a reference on the channel */ |
b0caa15a | 391 | atomic_long_inc(&channel_file->f_count); |
03037b98 | 392 | kfree(event_name); |
653fe716 MD |
393 | return event_fd; |
394 | ||
03037b98 | 395 | event_error: |
c0e31d2e | 396 | fput(event_file); |
653fe716 MD |
397 | file_error: |
398 | put_unused_fd(event_fd); | |
399 | fd_error: | |
85a9ca7f MD |
400 | ltt_event_put(event_desc); |
401 | get_error: | |
653fe716 MD |
402 | name_error: |
403 | kfree(event_name); | |
404 | return ret; | |
405 | } | |
ad1c05e1 MD |
406 | |
407 | /** | |
408 | * lttng_channel_ioctl - lttng syscall through ioctl | |
409 | * | |
c0e31d2e | 410 | * @file: the file |
ad1c05e1 MD |
411 | * @cmd: the command |
412 | * @arg: command arg | |
413 | * | |
414 | * This ioctl implements lttng commands: | |
38d024ae | 415 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
416 | * Returns an event stream file descriptor or failure. |
417 | * (typically, one event stream records events from one CPU) | |
38d024ae | 418 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 419 | * Returns an event file descriptor or failure. |
baf20995 | 420 | * |
baf20995 MD |
421 | * Channel and event file descriptors also hold a reference on the session. |
422 | */ | |
ad1c05e1 | 423 | static |
c0e31d2e | 424 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 425 | { |
baf20995 | 426 | switch (cmd) { |
38d024ae | 427 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 428 | return lttng_abi_open_stream(file); |
38d024ae MD |
429 | case LTTNG_KERNEL_EVENT: |
430 | return lttng_abi_create_event(file, (struct lttng_kernel_event __user *) arg); | |
baf20995 MD |
431 | default: |
432 | return -ENOIOCTLCMD; | |
433 | } | |
434 | } | |
435 | ||
5dbbdb43 MD |
436 | /** |
437 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
438 | * | |
439 | * @file: the file | |
440 | * @cmd: the command | |
441 | * @arg: command arg | |
442 | * | |
443 | * This ioctl implements lttng commands: | |
38d024ae | 444 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
445 | * Returns an event stream file descriptor or failure. |
446 | * | |
447 | * Channel and event file descriptors also hold a reference on the session. | |
448 | */ | |
449 | static | |
450 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
451 | { | |
452 | switch (cmd) { | |
38d024ae | 453 | case LTTNG_KERNEL_STREAM: |
5dbbdb43 MD |
454 | return lttng_abi_open_stream(file); |
455 | default: | |
456 | return -ENOIOCTLCMD; | |
457 | } | |
458 | } | |
459 | ||
3b923e5b MD |
460 | /* TODO: poll */ |
461 | #if 0 | |
653fe716 MD |
462 | /** |
463 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
464 | * | |
c0e31d2e | 465 | * @file: the file |
653fe716 MD |
466 | * @wait: poll table |
467 | */ | |
c0e31d2e | 468 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 469 | { |
c0e31d2e | 470 | struct ltt_channel *channel = file->private_data; |
653fe716 MD |
471 | unsigned int mask = 0; |
472 | ||
c0e31d2e | 473 | if (file->f_mode & FMODE_READ) { |
653fe716 | 474 | poll_wait_set_exclusive(wait); |
c0e31d2e | 475 | poll_wait(file, &channel->notify_wait, wait); |
653fe716 MD |
476 | |
477 | /* TODO: identify when the channel is being finalized. */ | |
478 | if (finalized) | |
479 | return POLLHUP; | |
480 | else | |
481 | return POLLIN | POLLRDNORM; | |
482 | } | |
483 | return mask; | |
484 | ||
485 | } | |
3b923e5b | 486 | #endif //0 |
653fe716 | 487 | |
0a84a57f MD |
488 | static |
489 | int lttng_channel_release(struct inode *inode, struct file *file) | |
490 | { | |
491 | struct ltt_channel *channel = file->private_data; | |
c269fff4 MD |
492 | |
493 | if (channel) | |
494 | fput(channel->session->file); | |
0a84a57f MD |
495 | return 0; |
496 | } | |
497 | ||
ad1c05e1 | 498 | static const struct file_operations lttng_channel_fops = { |
03037b98 | 499 | .release = lttng_channel_release, |
3b923e5b MD |
500 | /* TODO */ |
501 | #if 0 | |
653fe716 | 502 | .poll = lttng_channel_poll, |
3b923e5b | 503 | #endif //0 |
ad1c05e1 | 504 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 505 | #ifdef CONFIG_COMPAT |
03037b98 | 506 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 507 | #endif |
11b5a3c2 | 508 | }; |
baf20995 | 509 | |
5dbbdb43 MD |
510 | static const struct file_operations lttng_metadata_fops = { |
511 | .release = lttng_channel_release, | |
512 | .unlocked_ioctl = lttng_metadata_ioctl, | |
513 | #ifdef CONFIG_COMPAT | |
514 | .compat_ioctl = lttng_metadata_ioctl, | |
515 | #endif | |
516 | }; | |
517 | ||
0a84a57f MD |
518 | static |
519 | int lttng_event_release(struct inode *inode, struct file *file) | |
520 | { | |
521 | struct ltt_event *event = file->private_data; | |
c269fff4 | 522 | |
be066e6c MD |
523 | if (event) { |
524 | ltt_event_unregister(event); | |
c269fff4 | 525 | fput(event->chan->file); |
be066e6c | 526 | } |
0a84a57f MD |
527 | return 0; |
528 | } | |
529 | ||
3b923e5b | 530 | /* TODO: filter control ioctl */ |
0a84a57f MD |
531 | static const struct file_operations lttng_event_fops = { |
532 | .release = lttng_event_release, | |
11b5a3c2 | 533 | }; |
0a84a57f | 534 | |
1c25284c | 535 | int __init ltt_debugfs_abi_init(void) |
baf20995 MD |
536 | { |
537 | int ret = 0; | |
538 | ||
6d2a620c | 539 | wrapper_vmalloc_sync_all(); |
11b5a3c2 | 540 | lttng_dentry = debugfs_create_file("lttng", S_IWUSR, NULL, NULL, |
f3d01b96 | 541 | <tng_fops); |
11b5a3c2 | 542 | if (IS_ERR(lttng_dentry) || !lttng_dentry) { |
baf20995 MD |
543 | printk(KERN_ERR "Error creating LTTng control file\n"); |
544 | ret = -ENOMEM; | |
545 | goto error; | |
546 | } | |
547 | error: | |
548 | return ret; | |
549 | } | |
550 | ||
1c25284c | 551 | void __exit ltt_debugfs_abi_exit(void) |
baf20995 | 552 | { |
11b5a3c2 | 553 | debugfs_remove(lttng_dentry); |
baf20995 | 554 | } |