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" |
80c16bcf | 35 | #include "ltt-tracer.h" |
baf20995 MD |
36 | |
37 | /* | |
38 | * This is LTTng's own personal way to create a system call as an external | |
39 | * module. We use ioctl() on /sys/kernel/debug/lttng. | |
40 | */ | |
41 | ||
42 | static struct dentry *lttng_dentry; | |
ad1c05e1 MD |
43 | static const struct file_operations lttng_fops; |
44 | static const struct file_operations lttng_session_fops; | |
45 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 46 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 47 | static const struct file_operations lttng_event_fops; |
baf20995 | 48 | |
5dbbdb43 MD |
49 | enum channel_type { |
50 | PER_CPU_CHANNEL, | |
5dbbdb43 MD |
51 | METADATA_CHANNEL, |
52 | }; | |
53 | ||
ad1c05e1 | 54 | static |
baf20995 MD |
55 | int lttng_abi_create_session(void) |
56 | { | |
57 | struct ltt_session *session; | |
c0e31d2e | 58 | struct file *session_file; |
11b5a3c2 | 59 | int session_fd, ret; |
baf20995 | 60 | |
653fe716 | 61 | session = ltt_session_create(); |
baf20995 MD |
62 | if (!session) |
63 | return -ENOMEM; | |
1c25284c | 64 | session_fd = get_unused_fd(); |
baf20995 MD |
65 | if (session_fd < 0) { |
66 | ret = session_fd; | |
67 | goto fd_error; | |
68 | } | |
c0e31d2e | 69 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 70 | <tng_session_fops, |
baf20995 | 71 | session, O_RDWR); |
c0e31d2e MD |
72 | if (IS_ERR(session_file)) { |
73 | ret = PTR_ERR(session_file); | |
baf20995 MD |
74 | goto file_error; |
75 | } | |
c0e31d2e MD |
76 | session->file = session_file; |
77 | fd_install(session_fd, session_file); | |
baf20995 MD |
78 | return session_fd; |
79 | ||
80 | file_error: | |
81 | put_unused_fd(session_fd); | |
82 | fd_error: | |
83 | ltt_session_destroy(session); | |
84 | return ret; | |
85 | } | |
86 | ||
80c16bcf MD |
87 | static |
88 | long lttng_abi_tracer_version(struct file *file, | |
89 | struct lttng_kernel_tracer_version __user *uversion_param) | |
90 | { | |
91 | struct lttng_kernel_tracer_version v; | |
92 | ||
93 | v.version = LTTNG_VERSION; | |
94 | v.patchlevel = LTTNG_PATCHLEVEL; | |
95 | v.sublevel = LTTNG_SUBLEVEL; | |
96 | ||
97 | if (copy_to_user(uversion_param, &v, sizeof(v))) | |
98 | return -EFAULT; | |
99 | return 0; | |
100 | } | |
101 | ||
ad1c05e1 MD |
102 | /** |
103 | * lttng_ioctl - lttng syscall through ioctl | |
104 | * | |
c0e31d2e | 105 | * @file: the file |
ad1c05e1 MD |
106 | * @cmd: the command |
107 | * @arg: command arg | |
108 | * | |
109 | * This ioctl implements lttng commands: | |
38d024ae | 110 | * LTTNG_KERNEL_SESSION |
ad1c05e1 MD |
111 | * Returns a LTTng trace session file descriptor |
112 | * | |
113 | * The returned session will be deleted when its file descriptor is closed. | |
114 | */ | |
115 | static | |
c0e31d2e | 116 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
117 | { |
118 | switch (cmd) { | |
38d024ae | 119 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 120 | return lttng_abi_create_session(); |
80c16bcf MD |
121 | case LTTNG_KERNEL_TRACER_VERSION: |
122 | return lttng_abi_tracer_version(file, | |
123 | (struct lttng_kernel_tracer_version __user *) arg); | |
ad1c05e1 MD |
124 | default: |
125 | return -ENOIOCTLCMD; | |
126 | } | |
127 | } | |
128 | ||
ad1c05e1 MD |
129 | static const struct file_operations lttng_fops = { |
130 | .unlocked_ioctl = lttng_ioctl, | |
131 | #ifdef CONFIG_COMPAT | |
03037b98 | 132 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 133 | #endif |
11b5a3c2 | 134 | }; |
ad1c05e1 | 135 | |
5dbbdb43 MD |
136 | /* |
137 | * We tolerate no failure in this function (if one happens, we print a dmesg | |
138 | * error, but cannot return any error, because the channel information is | |
139 | * invariant. | |
140 | */ | |
141 | static | |
142 | void lttng_metadata_create_events(struct file *channel_file) | |
143 | { | |
144 | struct ltt_channel *channel = channel_file->private_data; | |
cd4bd11f | 145 | char *event_name = "lttng_metadata"; |
85a9ca7f | 146 | const struct lttng_event_desc *event_desc; |
5dbbdb43 MD |
147 | struct ltt_event *event; |
148 | int ret; | |
5dbbdb43 | 149 | |
85a9ca7f MD |
150 | event_desc = ltt_event_get(event_name); |
151 | if (!event_desc) { | |
5dbbdb43 | 152 | ret = -ENOENT; |
85a9ca7f | 153 | goto get_error; |
5dbbdb43 MD |
154 | } |
155 | /* | |
156 | * We tolerate no failure path after event creation. It will stay | |
157 | * invariant for the rest of the session. | |
158 | */ | |
38d024ae | 159 | event = ltt_event_create(channel, event_name, LTTNG_KERNEL_TRACEPOINTS, |
85a9ca7f | 160 | event_desc, NULL); |
5dbbdb43 | 161 | if (!event) { |
85a9ca7f | 162 | goto create_error; |
5dbbdb43 MD |
163 | ret = -EEXIST; |
164 | } | |
165 | return; | |
166 | ||
85a9ca7f MD |
167 | create_error: |
168 | ltt_event_put(event_desc); | |
169 | get_error: | |
5dbbdb43 MD |
170 | WARN_ON(1); |
171 | return; /* not allowed to return error */ | |
172 | } | |
173 | ||
174 | static | |
c0e31d2e | 175 | int lttng_abi_create_channel(struct file *session_file, |
38d024ae | 176 | struct lttng_kernel_channel __user *uchan_param, |
5dbbdb43 | 177 | enum channel_type channel_type) |
baf20995 | 178 | { |
c0e31d2e | 179 | struct ltt_session *session = session_file->private_data; |
5dbbdb43 MD |
180 | const struct file_operations *fops; |
181 | const char *transport_name; | |
baf20995 | 182 | struct ltt_channel *chan; |
c0e31d2e | 183 | struct file *chan_file; |
38d024ae | 184 | struct lttng_kernel_channel chan_param; |
baf20995 | 185 | int chan_fd; |
ad1c05e1 | 186 | int ret = 0; |
baf20995 | 187 | |
653fe716 | 188 | if (copy_from_user(&chan_param, uchan_param, sizeof(chan_param))) |
baf20995 | 189 | return -EFAULT; |
1c25284c | 190 | chan_fd = get_unused_fd(); |
baf20995 MD |
191 | if (chan_fd < 0) { |
192 | ret = chan_fd; | |
193 | goto fd_error; | |
194 | } | |
c0e31d2e | 195 | chan_file = anon_inode_getfile("[lttng_channel]", |
ad1c05e1 | 196 | <tng_channel_fops, |
03037b98 | 197 | NULL, O_RDWR); |
c0e31d2e MD |
198 | if (IS_ERR(chan_file)) { |
199 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
200 | goto file_error; |
201 | } | |
5dbbdb43 MD |
202 | switch (channel_type) { |
203 | case PER_CPU_CHANNEL: | |
204 | transport_name = chan_param.overwrite ? | |
205 | "relay-overwrite" : "relay-discard"; | |
206 | fops = <tng_channel_fops; | |
207 | break; | |
5dbbdb43 | 208 | case METADATA_CHANNEL: |
881833e3 | 209 | transport_name = "relay-metadata"; |
5dbbdb43 MD |
210 | fops = <tng_metadata_fops; |
211 | break; | |
212 | default: | |
213 | transport_name = "<unknown>"; | |
214 | break; | |
215 | } | |
03037b98 MD |
216 | /* |
217 | * We tolerate no failure path after channel creation. It will stay | |
218 | * invariant for the rest of the session. | |
219 | */ | |
5dbbdb43 | 220 | chan = ltt_channel_create(session, transport_name, NULL, |
11b5a3c2 MD |
221 | chan_param.subbuf_size, |
222 | chan_param.num_subbuf, | |
223 | chan_param.switch_timer_interval, | |
224 | chan_param.read_timer_interval); | |
03037b98 | 225 | if (!chan) { |
f3d01b96 | 226 | ret = -EINVAL; |
03037b98 MD |
227 | goto chan_error; |
228 | } | |
11b5a3c2 | 229 | chan->file = chan_file; |
c0e31d2e MD |
230 | chan_file->private_data = chan; |
231 | fd_install(chan_fd, chan_file); | |
cd4bd11f | 232 | if (channel_type == METADATA_CHANNEL) { |
5dbbdb43 | 233 | lttng_metadata_create_events(chan_file); |
cd4bd11f MD |
234 | session->metadata = chan; |
235 | } | |
5dbbdb43 | 236 | |
ad1c05e1 | 237 | /* The channel created holds a reference on the session */ |
b0caa15a | 238 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 239 | |
baf20995 MD |
240 | return chan_fd; |
241 | ||
03037b98 | 242 | chan_error: |
c0e31d2e | 243 | fput(chan_file); |
baf20995 MD |
244 | file_error: |
245 | put_unused_fd(chan_fd); | |
246 | fd_error: | |
baf20995 MD |
247 | return ret; |
248 | } | |
249 | ||
250 | /** | |
ad1c05e1 | 251 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 252 | * |
c0e31d2e | 253 | * @file: the file |
baf20995 MD |
254 | * @cmd: the command |
255 | * @arg: command arg | |
256 | * | |
257 | * This ioctl implements lttng commands: | |
38d024ae | 258 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 259 | * Returns a LTTng channel file descriptor |
ad1c05e1 MD |
260 | * |
261 | * The returned channel will be deleted when its file descriptor is closed. | |
262 | */ | |
263 | static | |
c0e31d2e | 264 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 265 | { |
c0e31d2e MD |
266 | struct ltt_session *session = file->private_data; |
267 | ||
ad1c05e1 | 268 | switch (cmd) { |
38d024ae | 269 | case LTTNG_KERNEL_CHANNEL: |
5dbbdb43 | 270 | return lttng_abi_create_channel(file, |
38d024ae | 271 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 272 | PER_CPU_CHANNEL); |
38d024ae | 273 | case LTTNG_KERNEL_SESSION_START: |
c0e31d2e | 274 | return ltt_session_start(session); |
38d024ae | 275 | case LTTNG_KERNEL_SESSION_STOP: |
c0e31d2e | 276 | return ltt_session_stop(session); |
38d024ae | 277 | case LTTNG_KERNEL_METADATA: |
5dbbdb43 | 278 | return lttng_abi_create_channel(file, |
38d024ae | 279 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 280 | METADATA_CHANNEL); |
ad1c05e1 MD |
281 | default: |
282 | return -ENOIOCTLCMD; | |
283 | } | |
284 | } | |
285 | ||
03037b98 MD |
286 | /* |
287 | * Called when the last file reference is dropped. | |
288 | * | |
289 | * Big fat note: channels and events are invariant for the whole session after | |
290 | * their creation. So this session destruction also destroys all channel and | |
291 | * event structures specific to this session (they are not destroyed when their | |
292 | * individual file is released). | |
293 | */ | |
ad1c05e1 | 294 | static |
03037b98 | 295 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 296 | { |
03037b98 | 297 | struct ltt_session *session = file->private_data; |
c269fff4 MD |
298 | |
299 | if (session) | |
300 | ltt_session_destroy(session); | |
11b5a3c2 | 301 | return 0; |
ad1c05e1 | 302 | } |
ad1c05e1 MD |
303 | |
304 | static const struct file_operations lttng_session_fops = { | |
03037b98 | 305 | .release = lttng_session_release, |
ad1c05e1 MD |
306 | .unlocked_ioctl = lttng_session_ioctl, |
307 | #ifdef CONFIG_COMPAT | |
03037b98 | 308 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 309 | #endif |
11b5a3c2 | 310 | }; |
ad1c05e1 MD |
311 | |
312 | static | |
c0e31d2e | 313 | int lttng_abi_open_stream(struct file *channel_file) |
ad1c05e1 | 314 | { |
c0e31d2e | 315 | struct ltt_channel *channel = channel_file->private_data; |
ad1c05e1 MD |
316 | struct lib_ring_buffer *buf; |
317 | int stream_fd, ret; | |
11b5a3c2 | 318 | struct file *stream_file; |
ad1c05e1 | 319 | |
11b5a3c2 | 320 | buf = channel->ops->buffer_read_open(channel->chan); |
ad1c05e1 MD |
321 | if (!buf) |
322 | return -ENOENT; | |
323 | ||
1c25284c | 324 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
325 | if (stream_fd < 0) { |
326 | ret = stream_fd; | |
327 | goto fd_error; | |
328 | } | |
c0e31d2e | 329 | stream_file = anon_inode_getfile("[lttng_stream]", |
7f57c73c | 330 | &lib_ring_buffer_file_operations, |
ad1c05e1 | 331 | buf, O_RDWR); |
c0e31d2e MD |
332 | if (IS_ERR(stream_file)) { |
333 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
334 | goto file_error; |
335 | } | |
409453cb MD |
336 | /* |
337 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
338 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
339 | * file descriptor, so we set FMODE_PREAD here. | |
340 | */ | |
d7b6f197 | 341 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 342 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
343 | /* |
344 | * The stream holds a reference to the channel within the generic ring | |
345 | * buffer library, so no need to hold a refcount on the channel and | |
346 | * session files here. | |
347 | */ | |
ad1c05e1 MD |
348 | return stream_fd; |
349 | ||
350 | file_error: | |
351 | put_unused_fd(stream_fd); | |
352 | fd_error: | |
11b5a3c2 | 353 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
354 | return ret; |
355 | } | |
356 | ||
653fe716 | 357 | static |
c0e31d2e | 358 | int lttng_abi_create_event(struct file *channel_file, |
38d024ae | 359 | struct lttng_kernel_event __user *uevent_param) |
653fe716 | 360 | { |
c0e31d2e | 361 | struct ltt_channel *channel = channel_file->private_data; |
85a9ca7f | 362 | const struct lttng_event_desc *event_desc; |
653fe716 MD |
363 | struct ltt_event *event; |
364 | char *event_name; | |
38d024ae | 365 | struct lttng_kernel_event event_param; |
653fe716 | 366 | int event_fd, ret; |
11b5a3c2 | 367 | struct file *event_file; |
653fe716 MD |
368 | |
369 | if (copy_from_user(&event_param, uevent_param, sizeof(event_param))) | |
370 | return -EFAULT; | |
371 | event_name = kmalloc(PATH_MAX, GFP_KERNEL); | |
372 | if (!event_name) | |
373 | return -ENOMEM; | |
981616e8 | 374 | if (strncpy_from_user(event_name, uevent_param->name, PATH_MAX) < 0) { |
653fe716 MD |
375 | ret = -EFAULT; |
376 | goto name_error; | |
377 | } | |
378 | event_name[PATH_MAX - 1] = '\0'; | |
dda6a249 | 379 | |
85a9ca7f MD |
380 | event_desc = ltt_event_get(event_name); |
381 | if (!event_desc) { | |
dda6a249 | 382 | ret = -ENOENT; |
85a9ca7f | 383 | goto get_error; |
dda6a249 | 384 | } |
1c25284c | 385 | event_fd = get_unused_fd(); |
653fe716 MD |
386 | if (event_fd < 0) { |
387 | ret = event_fd; | |
388 | goto fd_error; | |
389 | } | |
c0e31d2e | 390 | event_file = anon_inode_getfile("[lttng_event]", |
3b923e5b | 391 | <tng_event_fops, |
03037b98 | 392 | NULL, O_RDWR); |
c0e31d2e MD |
393 | if (IS_ERR(event_file)) { |
394 | ret = PTR_ERR(event_file); | |
653fe716 MD |
395 | goto file_error; |
396 | } | |
03037b98 MD |
397 | /* |
398 | * We tolerate no failure path after event creation. It will stay | |
399 | * invariant for the rest of the session. | |
400 | */ | |
d6d808f3 | 401 | event = ltt_event_create(channel, event_name, &event_param, |
85a9ca7f | 402 | event_desc, NULL); |
03037b98 | 403 | if (!event) { |
03037b98 | 404 | ret = -EEXIST; |
d6d808f3 | 405 | goto event_error; |
03037b98 | 406 | } |
c0e31d2e MD |
407 | event_file->private_data = event; |
408 | fd_install(event_fd, event_file); | |
653fe716 | 409 | /* The event holds a reference on the channel */ |
b0caa15a | 410 | atomic_long_inc(&channel_file->f_count); |
03037b98 | 411 | kfree(event_name); |
653fe716 MD |
412 | return event_fd; |
413 | ||
03037b98 | 414 | event_error: |
c0e31d2e | 415 | fput(event_file); |
653fe716 MD |
416 | file_error: |
417 | put_unused_fd(event_fd); | |
418 | fd_error: | |
85a9ca7f MD |
419 | ltt_event_put(event_desc); |
420 | get_error: | |
653fe716 MD |
421 | name_error: |
422 | kfree(event_name); | |
423 | return ret; | |
424 | } | |
ad1c05e1 MD |
425 | |
426 | /** | |
427 | * lttng_channel_ioctl - lttng syscall through ioctl | |
428 | * | |
c0e31d2e | 429 | * @file: the file |
ad1c05e1 MD |
430 | * @cmd: the command |
431 | * @arg: command arg | |
432 | * | |
433 | * This ioctl implements lttng commands: | |
38d024ae | 434 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
435 | * Returns an event stream file descriptor or failure. |
436 | * (typically, one event stream records events from one CPU) | |
38d024ae | 437 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 438 | * Returns an event file descriptor or failure. |
baf20995 | 439 | * |
baf20995 MD |
440 | * Channel and event file descriptors also hold a reference on the session. |
441 | */ | |
ad1c05e1 | 442 | static |
c0e31d2e | 443 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 444 | { |
baf20995 | 445 | switch (cmd) { |
38d024ae | 446 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 447 | return lttng_abi_open_stream(file); |
38d024ae MD |
448 | case LTTNG_KERNEL_EVENT: |
449 | return lttng_abi_create_event(file, (struct lttng_kernel_event __user *) arg); | |
baf20995 MD |
450 | default: |
451 | return -ENOIOCTLCMD; | |
452 | } | |
453 | } | |
454 | ||
5dbbdb43 MD |
455 | /** |
456 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
457 | * | |
458 | * @file: the file | |
459 | * @cmd: the command | |
460 | * @arg: command arg | |
461 | * | |
462 | * This ioctl implements lttng commands: | |
38d024ae | 463 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
464 | * Returns an event stream file descriptor or failure. |
465 | * | |
466 | * Channel and event file descriptors also hold a reference on the session. | |
467 | */ | |
468 | static | |
469 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
470 | { | |
471 | switch (cmd) { | |
38d024ae | 472 | case LTTNG_KERNEL_STREAM: |
5dbbdb43 MD |
473 | return lttng_abi_open_stream(file); |
474 | default: | |
475 | return -ENOIOCTLCMD; | |
476 | } | |
477 | } | |
478 | ||
3b923e5b MD |
479 | /* TODO: poll */ |
480 | #if 0 | |
653fe716 MD |
481 | /** |
482 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
483 | * | |
c0e31d2e | 484 | * @file: the file |
653fe716 MD |
485 | * @wait: poll table |
486 | */ | |
c0e31d2e | 487 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 488 | { |
c0e31d2e | 489 | struct ltt_channel *channel = file->private_data; |
653fe716 MD |
490 | unsigned int mask = 0; |
491 | ||
c0e31d2e | 492 | if (file->f_mode & FMODE_READ) { |
653fe716 | 493 | poll_wait_set_exclusive(wait); |
c0e31d2e | 494 | poll_wait(file, &channel->notify_wait, wait); |
653fe716 MD |
495 | |
496 | /* TODO: identify when the channel is being finalized. */ | |
497 | if (finalized) | |
498 | return POLLHUP; | |
499 | else | |
500 | return POLLIN | POLLRDNORM; | |
501 | } | |
502 | return mask; | |
503 | ||
504 | } | |
3b923e5b | 505 | #endif //0 |
653fe716 | 506 | |
0a84a57f MD |
507 | static |
508 | int lttng_channel_release(struct inode *inode, struct file *file) | |
509 | { | |
510 | struct ltt_channel *channel = file->private_data; | |
c269fff4 MD |
511 | |
512 | if (channel) | |
513 | fput(channel->session->file); | |
0a84a57f MD |
514 | return 0; |
515 | } | |
516 | ||
ad1c05e1 | 517 | static const struct file_operations lttng_channel_fops = { |
03037b98 | 518 | .release = lttng_channel_release, |
3b923e5b MD |
519 | /* TODO */ |
520 | #if 0 | |
653fe716 | 521 | .poll = lttng_channel_poll, |
3b923e5b | 522 | #endif //0 |
ad1c05e1 | 523 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 524 | #ifdef CONFIG_COMPAT |
03037b98 | 525 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 526 | #endif |
11b5a3c2 | 527 | }; |
baf20995 | 528 | |
5dbbdb43 MD |
529 | static const struct file_operations lttng_metadata_fops = { |
530 | .release = lttng_channel_release, | |
531 | .unlocked_ioctl = lttng_metadata_ioctl, | |
532 | #ifdef CONFIG_COMPAT | |
533 | .compat_ioctl = lttng_metadata_ioctl, | |
534 | #endif | |
535 | }; | |
536 | ||
0a84a57f MD |
537 | static |
538 | int lttng_event_release(struct inode *inode, struct file *file) | |
539 | { | |
540 | struct ltt_event *event = file->private_data; | |
c269fff4 | 541 | |
be066e6c MD |
542 | if (event) { |
543 | ltt_event_unregister(event); | |
c269fff4 | 544 | fput(event->chan->file); |
be066e6c | 545 | } |
0a84a57f MD |
546 | return 0; |
547 | } | |
548 | ||
3b923e5b | 549 | /* TODO: filter control ioctl */ |
0a84a57f MD |
550 | static const struct file_operations lttng_event_fops = { |
551 | .release = lttng_event_release, | |
11b5a3c2 | 552 | }; |
0a84a57f | 553 | |
1c25284c | 554 | int __init ltt_debugfs_abi_init(void) |
baf20995 MD |
555 | { |
556 | int ret = 0; | |
557 | ||
6d2a620c | 558 | wrapper_vmalloc_sync_all(); |
11b5a3c2 | 559 | lttng_dentry = debugfs_create_file("lttng", S_IWUSR, NULL, NULL, |
f3d01b96 | 560 | <tng_fops); |
11b5a3c2 | 561 | if (IS_ERR(lttng_dentry) || !lttng_dentry) { |
baf20995 MD |
562 | printk(KERN_ERR "Error creating LTTng control file\n"); |
563 | ret = -ENOMEM; | |
564 | goto error; | |
565 | } | |
566 | error: | |
567 | return ret; | |
568 | } | |
569 | ||
1c25284c | 570 | void __exit ltt_debugfs_abi_exit(void) |
baf20995 | 571 | { |
11b5a3c2 | 572 | debugfs_remove(lttng_dentry); |
baf20995 | 573 | } |