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; | |
e70a4758 MD |
145 | static struct lttng_kernel_event metadata_params = { |
146 | .instrumentation = LTTNG_KERNEL_TRACEPOINTS, | |
147 | .name = "lttng_metadata", | |
148 | }; | |
cd4bd11f | 149 | char *event_name = "lttng_metadata"; |
5dbbdb43 MD |
150 | struct ltt_event *event; |
151 | int ret; | |
5dbbdb43 | 152 | |
5dbbdb43 MD |
153 | /* |
154 | * We tolerate no failure path after event creation. It will stay | |
155 | * invariant for the rest of the session. | |
156 | */ | |
e70a4758 | 157 | event = ltt_event_create(channel, event_name, &metadata_params, NULL); |
5dbbdb43 | 158 | if (!event) { |
85a9ca7f | 159 | goto create_error; |
5dbbdb43 MD |
160 | ret = -EEXIST; |
161 | } | |
162 | return; | |
163 | ||
85a9ca7f | 164 | create_error: |
5dbbdb43 MD |
165 | WARN_ON(1); |
166 | return; /* not allowed to return error */ | |
167 | } | |
168 | ||
169 | static | |
c0e31d2e | 170 | int lttng_abi_create_channel(struct file *session_file, |
38d024ae | 171 | struct lttng_kernel_channel __user *uchan_param, |
5dbbdb43 | 172 | enum channel_type channel_type) |
baf20995 | 173 | { |
c0e31d2e | 174 | struct ltt_session *session = session_file->private_data; |
5dbbdb43 MD |
175 | const struct file_operations *fops; |
176 | const char *transport_name; | |
baf20995 | 177 | struct ltt_channel *chan; |
c0e31d2e | 178 | struct file *chan_file; |
38d024ae | 179 | struct lttng_kernel_channel chan_param; |
baf20995 | 180 | int chan_fd; |
ad1c05e1 | 181 | int ret = 0; |
baf20995 | 182 | |
653fe716 | 183 | if (copy_from_user(&chan_param, uchan_param, sizeof(chan_param))) |
baf20995 | 184 | return -EFAULT; |
1c25284c | 185 | chan_fd = get_unused_fd(); |
baf20995 MD |
186 | if (chan_fd < 0) { |
187 | ret = chan_fd; | |
188 | goto fd_error; | |
189 | } | |
c0e31d2e | 190 | chan_file = anon_inode_getfile("[lttng_channel]", |
ad1c05e1 | 191 | <tng_channel_fops, |
03037b98 | 192 | NULL, O_RDWR); |
c0e31d2e MD |
193 | if (IS_ERR(chan_file)) { |
194 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
195 | goto file_error; |
196 | } | |
5dbbdb43 MD |
197 | switch (channel_type) { |
198 | case PER_CPU_CHANNEL: | |
199 | transport_name = chan_param.overwrite ? | |
200 | "relay-overwrite" : "relay-discard"; | |
201 | fops = <tng_channel_fops; | |
202 | break; | |
5dbbdb43 | 203 | case METADATA_CHANNEL: |
881833e3 | 204 | transport_name = "relay-metadata"; |
5dbbdb43 MD |
205 | fops = <tng_metadata_fops; |
206 | break; | |
207 | default: | |
208 | transport_name = "<unknown>"; | |
209 | break; | |
210 | } | |
03037b98 MD |
211 | /* |
212 | * We tolerate no failure path after channel creation. It will stay | |
213 | * invariant for the rest of the session. | |
214 | */ | |
5dbbdb43 | 215 | chan = ltt_channel_create(session, transport_name, NULL, |
11b5a3c2 MD |
216 | chan_param.subbuf_size, |
217 | chan_param.num_subbuf, | |
218 | chan_param.switch_timer_interval, | |
219 | chan_param.read_timer_interval); | |
03037b98 | 220 | if (!chan) { |
f3d01b96 | 221 | ret = -EINVAL; |
03037b98 MD |
222 | goto chan_error; |
223 | } | |
11b5a3c2 | 224 | chan->file = chan_file; |
c0e31d2e MD |
225 | chan_file->private_data = chan; |
226 | fd_install(chan_fd, chan_file); | |
cd4bd11f | 227 | if (channel_type == METADATA_CHANNEL) { |
cd4bd11f | 228 | session->metadata = chan; |
4f1c3952 | 229 | lttng_metadata_create_events(chan_file); |
cd4bd11f | 230 | } |
5dbbdb43 | 231 | |
ad1c05e1 | 232 | /* The channel created holds a reference on the session */ |
b0caa15a | 233 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 234 | |
baf20995 MD |
235 | return chan_fd; |
236 | ||
03037b98 | 237 | chan_error: |
c0e31d2e | 238 | fput(chan_file); |
baf20995 MD |
239 | file_error: |
240 | put_unused_fd(chan_fd); | |
241 | fd_error: | |
baf20995 MD |
242 | return ret; |
243 | } | |
244 | ||
245 | /** | |
ad1c05e1 | 246 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 247 | * |
c0e31d2e | 248 | * @file: the file |
baf20995 MD |
249 | * @cmd: the command |
250 | * @arg: command arg | |
251 | * | |
252 | * This ioctl implements lttng commands: | |
38d024ae | 253 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 254 | * Returns a LTTng channel file descriptor |
ad1c05e1 MD |
255 | * |
256 | * The returned channel will be deleted when its file descriptor is closed. | |
257 | */ | |
258 | static | |
c0e31d2e | 259 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 260 | { |
c0e31d2e MD |
261 | struct ltt_session *session = file->private_data; |
262 | ||
ad1c05e1 | 263 | switch (cmd) { |
38d024ae | 264 | case LTTNG_KERNEL_CHANNEL: |
5dbbdb43 | 265 | return lttng_abi_create_channel(file, |
38d024ae | 266 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 267 | PER_CPU_CHANNEL); |
38d024ae | 268 | case LTTNG_KERNEL_SESSION_START: |
c0e31d2e | 269 | return ltt_session_start(session); |
38d024ae | 270 | case LTTNG_KERNEL_SESSION_STOP: |
c0e31d2e | 271 | return ltt_session_stop(session); |
38d024ae | 272 | case LTTNG_KERNEL_METADATA: |
5dbbdb43 | 273 | return lttng_abi_create_channel(file, |
38d024ae | 274 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 275 | METADATA_CHANNEL); |
ad1c05e1 MD |
276 | default: |
277 | return -ENOIOCTLCMD; | |
278 | } | |
279 | } | |
280 | ||
03037b98 MD |
281 | /* |
282 | * Called when the last file reference is dropped. | |
283 | * | |
284 | * Big fat note: channels and events are invariant for the whole session after | |
285 | * their creation. So this session destruction also destroys all channel and | |
286 | * event structures specific to this session (they are not destroyed when their | |
287 | * individual file is released). | |
288 | */ | |
ad1c05e1 | 289 | static |
03037b98 | 290 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 291 | { |
03037b98 | 292 | struct ltt_session *session = file->private_data; |
c269fff4 MD |
293 | |
294 | if (session) | |
295 | ltt_session_destroy(session); | |
11b5a3c2 | 296 | return 0; |
ad1c05e1 | 297 | } |
ad1c05e1 MD |
298 | |
299 | static const struct file_operations lttng_session_fops = { | |
03037b98 | 300 | .release = lttng_session_release, |
ad1c05e1 MD |
301 | .unlocked_ioctl = lttng_session_ioctl, |
302 | #ifdef CONFIG_COMPAT | |
03037b98 | 303 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 304 | #endif |
11b5a3c2 | 305 | }; |
ad1c05e1 MD |
306 | |
307 | static | |
c0e31d2e | 308 | int lttng_abi_open_stream(struct file *channel_file) |
ad1c05e1 | 309 | { |
c0e31d2e | 310 | struct ltt_channel *channel = channel_file->private_data; |
ad1c05e1 MD |
311 | struct lib_ring_buffer *buf; |
312 | int stream_fd, ret; | |
11b5a3c2 | 313 | struct file *stream_file; |
ad1c05e1 | 314 | |
11b5a3c2 | 315 | buf = channel->ops->buffer_read_open(channel->chan); |
ad1c05e1 MD |
316 | if (!buf) |
317 | return -ENOENT; | |
318 | ||
1c25284c | 319 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
320 | if (stream_fd < 0) { |
321 | ret = stream_fd; | |
322 | goto fd_error; | |
323 | } | |
c0e31d2e | 324 | stream_file = anon_inode_getfile("[lttng_stream]", |
7f57c73c | 325 | &lib_ring_buffer_file_operations, |
ad1c05e1 | 326 | buf, O_RDWR); |
c0e31d2e MD |
327 | if (IS_ERR(stream_file)) { |
328 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
329 | goto file_error; |
330 | } | |
409453cb MD |
331 | /* |
332 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
333 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
334 | * file descriptor, so we set FMODE_PREAD here. | |
335 | */ | |
d7b6f197 | 336 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 337 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
338 | /* |
339 | * The stream holds a reference to the channel within the generic ring | |
340 | * buffer library, so no need to hold a refcount on the channel and | |
341 | * session files here. | |
342 | */ | |
ad1c05e1 MD |
343 | return stream_fd; |
344 | ||
345 | file_error: | |
346 | put_unused_fd(stream_fd); | |
347 | fd_error: | |
11b5a3c2 | 348 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
349 | return ret; |
350 | } | |
351 | ||
653fe716 | 352 | static |
c0e31d2e | 353 | int lttng_abi_create_event(struct file *channel_file, |
38d024ae | 354 | struct lttng_kernel_event __user *uevent_param) |
653fe716 | 355 | { |
c0e31d2e | 356 | struct ltt_channel *channel = channel_file->private_data; |
653fe716 MD |
357 | struct ltt_event *event; |
358 | char *event_name; | |
38d024ae | 359 | struct lttng_kernel_event event_param; |
653fe716 | 360 | int event_fd, ret; |
11b5a3c2 | 361 | struct file *event_file; |
653fe716 MD |
362 | |
363 | if (copy_from_user(&event_param, uevent_param, sizeof(event_param))) | |
364 | return -EFAULT; | |
365 | event_name = kmalloc(PATH_MAX, GFP_KERNEL); | |
366 | if (!event_name) | |
367 | return -ENOMEM; | |
981616e8 | 368 | if (strncpy_from_user(event_name, uevent_param->name, PATH_MAX) < 0) { |
653fe716 MD |
369 | ret = -EFAULT; |
370 | goto name_error; | |
371 | } | |
372 | event_name[PATH_MAX - 1] = '\0'; | |
e0a7a7c4 MD |
373 | switch (event_param.instrumentation) { |
374 | case LTTNG_KERNEL_KPROBES: | |
375 | event_param.u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; | |
376 | break; | |
377 | case LTTNG_KERNEL_FUNCTION_TRACER: | |
378 | event_param.u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; | |
379 | break; | |
380 | default: | |
381 | break; | |
382 | } | |
1c25284c | 383 | event_fd = get_unused_fd(); |
653fe716 MD |
384 | if (event_fd < 0) { |
385 | ret = event_fd; | |
386 | goto fd_error; | |
387 | } | |
c0e31d2e | 388 | event_file = anon_inode_getfile("[lttng_event]", |
3b923e5b | 389 | <tng_event_fops, |
03037b98 | 390 | NULL, O_RDWR); |
c0e31d2e MD |
391 | if (IS_ERR(event_file)) { |
392 | ret = PTR_ERR(event_file); | |
653fe716 MD |
393 | goto file_error; |
394 | } | |
03037b98 MD |
395 | /* |
396 | * We tolerate no failure path after event creation. It will stay | |
397 | * invariant for the rest of the session. | |
398 | */ | |
d3dbe23c | 399 | event = ltt_event_create(channel, event_name, &event_param, NULL); |
03037b98 | 400 | if (!event) { |
03037b98 | 401 | ret = -EEXIST; |
d6d808f3 | 402 | goto event_error; |
03037b98 | 403 | } |
c0e31d2e MD |
404 | event_file->private_data = event; |
405 | fd_install(event_fd, event_file); | |
653fe716 | 406 | /* The event holds a reference on the channel */ |
b0caa15a | 407 | atomic_long_inc(&channel_file->f_count); |
03037b98 | 408 | kfree(event_name); |
653fe716 MD |
409 | return event_fd; |
410 | ||
03037b98 | 411 | event_error: |
c0e31d2e | 412 | fput(event_file); |
653fe716 MD |
413 | file_error: |
414 | put_unused_fd(event_fd); | |
415 | fd_error: | |
653fe716 MD |
416 | name_error: |
417 | kfree(event_name); | |
418 | return ret; | |
419 | } | |
ad1c05e1 MD |
420 | |
421 | /** | |
422 | * lttng_channel_ioctl - lttng syscall through ioctl | |
423 | * | |
c0e31d2e | 424 | * @file: the file |
ad1c05e1 MD |
425 | * @cmd: the command |
426 | * @arg: command arg | |
427 | * | |
428 | * This ioctl implements lttng commands: | |
38d024ae | 429 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
430 | * Returns an event stream file descriptor or failure. |
431 | * (typically, one event stream records events from one CPU) | |
38d024ae | 432 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 433 | * Returns an event file descriptor or failure. |
baf20995 | 434 | * |
baf20995 MD |
435 | * Channel and event file descriptors also hold a reference on the session. |
436 | */ | |
ad1c05e1 | 437 | static |
c0e31d2e | 438 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 439 | { |
baf20995 | 440 | switch (cmd) { |
38d024ae | 441 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 442 | return lttng_abi_open_stream(file); |
38d024ae MD |
443 | case LTTNG_KERNEL_EVENT: |
444 | return lttng_abi_create_event(file, (struct lttng_kernel_event __user *) arg); | |
baf20995 MD |
445 | default: |
446 | return -ENOIOCTLCMD; | |
447 | } | |
448 | } | |
449 | ||
5dbbdb43 MD |
450 | /** |
451 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
452 | * | |
453 | * @file: the file | |
454 | * @cmd: the command | |
455 | * @arg: command arg | |
456 | * | |
457 | * This ioctl implements lttng commands: | |
38d024ae | 458 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
459 | * Returns an event stream file descriptor or failure. |
460 | * | |
461 | * Channel and event file descriptors also hold a reference on the session. | |
462 | */ | |
463 | static | |
464 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
465 | { | |
466 | switch (cmd) { | |
38d024ae | 467 | case LTTNG_KERNEL_STREAM: |
5dbbdb43 MD |
468 | return lttng_abi_open_stream(file); |
469 | default: | |
470 | return -ENOIOCTLCMD; | |
471 | } | |
472 | } | |
473 | ||
3b923e5b MD |
474 | /* TODO: poll */ |
475 | #if 0 | |
653fe716 MD |
476 | /** |
477 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
478 | * | |
c0e31d2e | 479 | * @file: the file |
653fe716 MD |
480 | * @wait: poll table |
481 | */ | |
c0e31d2e | 482 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 483 | { |
c0e31d2e | 484 | struct ltt_channel *channel = file->private_data; |
653fe716 MD |
485 | unsigned int mask = 0; |
486 | ||
c0e31d2e | 487 | if (file->f_mode & FMODE_READ) { |
653fe716 | 488 | poll_wait_set_exclusive(wait); |
c0e31d2e | 489 | poll_wait(file, &channel->notify_wait, wait); |
653fe716 MD |
490 | |
491 | /* TODO: identify when the channel is being finalized. */ | |
492 | if (finalized) | |
493 | return POLLHUP; | |
494 | else | |
495 | return POLLIN | POLLRDNORM; | |
496 | } | |
497 | return mask; | |
498 | ||
499 | } | |
3b923e5b | 500 | #endif //0 |
653fe716 | 501 | |
0a84a57f MD |
502 | static |
503 | int lttng_channel_release(struct inode *inode, struct file *file) | |
504 | { | |
505 | struct ltt_channel *channel = file->private_data; | |
c269fff4 MD |
506 | |
507 | if (channel) | |
508 | fput(channel->session->file); | |
0a84a57f MD |
509 | return 0; |
510 | } | |
511 | ||
ad1c05e1 | 512 | static const struct file_operations lttng_channel_fops = { |
03037b98 | 513 | .release = lttng_channel_release, |
3b923e5b MD |
514 | /* TODO */ |
515 | #if 0 | |
653fe716 | 516 | .poll = lttng_channel_poll, |
3b923e5b | 517 | #endif //0 |
ad1c05e1 | 518 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 519 | #ifdef CONFIG_COMPAT |
03037b98 | 520 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 521 | #endif |
11b5a3c2 | 522 | }; |
baf20995 | 523 | |
5dbbdb43 MD |
524 | static const struct file_operations lttng_metadata_fops = { |
525 | .release = lttng_channel_release, | |
526 | .unlocked_ioctl = lttng_metadata_ioctl, | |
527 | #ifdef CONFIG_COMPAT | |
528 | .compat_ioctl = lttng_metadata_ioctl, | |
529 | #endif | |
530 | }; | |
531 | ||
0a84a57f MD |
532 | static |
533 | int lttng_event_release(struct inode *inode, struct file *file) | |
534 | { | |
535 | struct ltt_event *event = file->private_data; | |
c269fff4 | 536 | |
aa7c23a9 | 537 | if (event) |
c269fff4 | 538 | fput(event->chan->file); |
0a84a57f MD |
539 | return 0; |
540 | } | |
541 | ||
3b923e5b | 542 | /* TODO: filter control ioctl */ |
0a84a57f MD |
543 | static const struct file_operations lttng_event_fops = { |
544 | .release = lttng_event_release, | |
11b5a3c2 | 545 | }; |
0a84a57f | 546 | |
1c25284c | 547 | int __init ltt_debugfs_abi_init(void) |
baf20995 MD |
548 | { |
549 | int ret = 0; | |
550 | ||
6d2a620c | 551 | wrapper_vmalloc_sync_all(); |
11b5a3c2 | 552 | lttng_dentry = debugfs_create_file("lttng", S_IWUSR, NULL, NULL, |
f3d01b96 | 553 | <tng_fops); |
11b5a3c2 | 554 | if (IS_ERR(lttng_dentry) || !lttng_dentry) { |
baf20995 MD |
555 | printk(KERN_ERR "Error creating LTTng control file\n"); |
556 | ret = -ENOMEM; | |
557 | goto error; | |
558 | } | |
559 | error: | |
560 | return ret; | |
561 | } | |
562 | ||
1c25284c | 563 | void __exit ltt_debugfs_abi_exit(void) |
baf20995 | 564 | { |
11b5a3c2 | 565 | debugfs_remove(lttng_dentry); |
baf20995 | 566 | } |