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 | 145 | static struct lttng_kernel_event metadata_params = { |
ab2277d6 | 146 | .instrumentation = LTTNG_KERNEL_TRACEPOINT, |
e70a4758 MD |
147 | .name = "lttng_metadata", |
148 | }; | |
5dbbdb43 MD |
149 | struct ltt_event *event; |
150 | int ret; | |
5dbbdb43 | 151 | |
5dbbdb43 MD |
152 | /* |
153 | * We tolerate no failure path after event creation. It will stay | |
154 | * invariant for the rest of the session. | |
155 | */ | |
30bdb6e4 | 156 | event = ltt_event_create(channel, &metadata_params, NULL); |
5dbbdb43 | 157 | if (!event) { |
85a9ca7f | 158 | goto create_error; |
5dbbdb43 MD |
159 | ret = -EEXIST; |
160 | } | |
161 | return; | |
162 | ||
85a9ca7f | 163 | create_error: |
5dbbdb43 MD |
164 | WARN_ON(1); |
165 | return; /* not allowed to return error */ | |
166 | } | |
167 | ||
168 | static | |
c0e31d2e | 169 | int lttng_abi_create_channel(struct file *session_file, |
38d024ae | 170 | struct lttng_kernel_channel __user *uchan_param, |
5dbbdb43 | 171 | enum channel_type channel_type) |
baf20995 | 172 | { |
c0e31d2e | 173 | struct ltt_session *session = session_file->private_data; |
5dbbdb43 MD |
174 | const struct file_operations *fops; |
175 | const char *transport_name; | |
baf20995 | 176 | struct ltt_channel *chan; |
c0e31d2e | 177 | struct file *chan_file; |
38d024ae | 178 | struct lttng_kernel_channel chan_param; |
baf20995 | 179 | int chan_fd; |
ad1c05e1 | 180 | int ret = 0; |
baf20995 | 181 | |
653fe716 | 182 | if (copy_from_user(&chan_param, uchan_param, sizeof(chan_param))) |
baf20995 | 183 | return -EFAULT; |
1c25284c | 184 | chan_fd = get_unused_fd(); |
baf20995 MD |
185 | if (chan_fd < 0) { |
186 | ret = chan_fd; | |
187 | goto fd_error; | |
188 | } | |
c0e31d2e | 189 | chan_file = anon_inode_getfile("[lttng_channel]", |
ad1c05e1 | 190 | <tng_channel_fops, |
03037b98 | 191 | NULL, O_RDWR); |
c0e31d2e MD |
192 | if (IS_ERR(chan_file)) { |
193 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
194 | goto file_error; |
195 | } | |
5dbbdb43 MD |
196 | switch (channel_type) { |
197 | case PER_CPU_CHANNEL: | |
198 | transport_name = chan_param.overwrite ? | |
199 | "relay-overwrite" : "relay-discard"; | |
200 | fops = <tng_channel_fops; | |
201 | break; | |
5dbbdb43 | 202 | case METADATA_CHANNEL: |
881833e3 | 203 | transport_name = "relay-metadata"; |
5dbbdb43 MD |
204 | fops = <tng_metadata_fops; |
205 | break; | |
206 | default: | |
207 | transport_name = "<unknown>"; | |
208 | break; | |
209 | } | |
03037b98 MD |
210 | /* |
211 | * We tolerate no failure path after channel creation. It will stay | |
212 | * invariant for the rest of the session. | |
213 | */ | |
5dbbdb43 | 214 | chan = ltt_channel_create(session, transport_name, NULL, |
11b5a3c2 MD |
215 | chan_param.subbuf_size, |
216 | chan_param.num_subbuf, | |
217 | chan_param.switch_timer_interval, | |
218 | chan_param.read_timer_interval); | |
03037b98 | 219 | if (!chan) { |
f3d01b96 | 220 | ret = -EINVAL; |
03037b98 MD |
221 | goto chan_error; |
222 | } | |
11b5a3c2 | 223 | chan->file = chan_file; |
c0e31d2e MD |
224 | chan_file->private_data = chan; |
225 | fd_install(chan_fd, chan_file); | |
cd4bd11f | 226 | if (channel_type == METADATA_CHANNEL) { |
cd4bd11f | 227 | session->metadata = chan; |
4f1c3952 | 228 | lttng_metadata_create_events(chan_file); |
cd4bd11f | 229 | } |
5dbbdb43 | 230 | |
ad1c05e1 | 231 | /* The channel created holds a reference on the session */ |
b0caa15a | 232 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 233 | |
baf20995 MD |
234 | return chan_fd; |
235 | ||
03037b98 | 236 | chan_error: |
c0e31d2e | 237 | fput(chan_file); |
baf20995 MD |
238 | file_error: |
239 | put_unused_fd(chan_fd); | |
240 | fd_error: | |
baf20995 MD |
241 | return ret; |
242 | } | |
243 | ||
244 | /** | |
ad1c05e1 | 245 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 246 | * |
c0e31d2e | 247 | * @file: the file |
baf20995 MD |
248 | * @cmd: the command |
249 | * @arg: command arg | |
250 | * | |
251 | * This ioctl implements lttng commands: | |
38d024ae | 252 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 253 | * Returns a LTTng channel file descriptor |
ad1c05e1 MD |
254 | * |
255 | * The returned channel will be deleted when its file descriptor is closed. | |
256 | */ | |
257 | static | |
c0e31d2e | 258 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 259 | { |
c0e31d2e MD |
260 | struct ltt_session *session = file->private_data; |
261 | ||
ad1c05e1 | 262 | switch (cmd) { |
38d024ae | 263 | case LTTNG_KERNEL_CHANNEL: |
5dbbdb43 | 264 | return lttng_abi_create_channel(file, |
38d024ae | 265 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 266 | PER_CPU_CHANNEL); |
38d024ae | 267 | case LTTNG_KERNEL_SESSION_START: |
c0e31d2e | 268 | return ltt_session_start(session); |
38d024ae | 269 | case LTTNG_KERNEL_SESSION_STOP: |
c0e31d2e | 270 | return ltt_session_stop(session); |
38d024ae | 271 | case LTTNG_KERNEL_METADATA: |
5dbbdb43 | 272 | return lttng_abi_create_channel(file, |
38d024ae | 273 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 274 | METADATA_CHANNEL); |
ad1c05e1 MD |
275 | default: |
276 | return -ENOIOCTLCMD; | |
277 | } | |
278 | } | |
279 | ||
03037b98 MD |
280 | /* |
281 | * Called when the last file reference is dropped. | |
282 | * | |
283 | * Big fat note: channels and events are invariant for the whole session after | |
284 | * their creation. So this session destruction also destroys all channel and | |
285 | * event structures specific to this session (they are not destroyed when their | |
286 | * individual file is released). | |
287 | */ | |
ad1c05e1 | 288 | static |
03037b98 | 289 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 290 | { |
03037b98 | 291 | struct ltt_session *session = file->private_data; |
c269fff4 MD |
292 | |
293 | if (session) | |
294 | ltt_session_destroy(session); | |
11b5a3c2 | 295 | return 0; |
ad1c05e1 | 296 | } |
ad1c05e1 MD |
297 | |
298 | static const struct file_operations lttng_session_fops = { | |
03037b98 | 299 | .release = lttng_session_release, |
ad1c05e1 MD |
300 | .unlocked_ioctl = lttng_session_ioctl, |
301 | #ifdef CONFIG_COMPAT | |
03037b98 | 302 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 303 | #endif |
11b5a3c2 | 304 | }; |
ad1c05e1 MD |
305 | |
306 | static | |
c0e31d2e | 307 | int lttng_abi_open_stream(struct file *channel_file) |
ad1c05e1 | 308 | { |
c0e31d2e | 309 | struct ltt_channel *channel = channel_file->private_data; |
ad1c05e1 MD |
310 | struct lib_ring_buffer *buf; |
311 | int stream_fd, ret; | |
11b5a3c2 | 312 | struct file *stream_file; |
ad1c05e1 | 313 | |
11b5a3c2 | 314 | buf = channel->ops->buffer_read_open(channel->chan); |
ad1c05e1 MD |
315 | if (!buf) |
316 | return -ENOENT; | |
317 | ||
1c25284c | 318 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
319 | if (stream_fd < 0) { |
320 | ret = stream_fd; | |
321 | goto fd_error; | |
322 | } | |
c0e31d2e | 323 | stream_file = anon_inode_getfile("[lttng_stream]", |
7f57c73c | 324 | &lib_ring_buffer_file_operations, |
ad1c05e1 | 325 | buf, O_RDWR); |
c0e31d2e MD |
326 | if (IS_ERR(stream_file)) { |
327 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
328 | goto file_error; |
329 | } | |
409453cb MD |
330 | /* |
331 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
332 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
333 | * file descriptor, so we set FMODE_PREAD here. | |
334 | */ | |
d7b6f197 | 335 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 336 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
337 | /* |
338 | * The stream holds a reference to the channel within the generic ring | |
339 | * buffer library, so no need to hold a refcount on the channel and | |
340 | * session files here. | |
341 | */ | |
ad1c05e1 MD |
342 | return stream_fd; |
343 | ||
344 | file_error: | |
345 | put_unused_fd(stream_fd); | |
346 | fd_error: | |
11b5a3c2 | 347 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
348 | return ret; |
349 | } | |
350 | ||
653fe716 | 351 | static |
c0e31d2e | 352 | int lttng_abi_create_event(struct file *channel_file, |
38d024ae | 353 | struct lttng_kernel_event __user *uevent_param) |
653fe716 | 354 | { |
c0e31d2e | 355 | struct ltt_channel *channel = channel_file->private_data; |
653fe716 | 356 | struct ltt_event *event; |
38d024ae | 357 | struct lttng_kernel_event event_param; |
653fe716 | 358 | int event_fd, ret; |
11b5a3c2 | 359 | struct file *event_file; |
653fe716 MD |
360 | |
361 | if (copy_from_user(&event_param, uevent_param, sizeof(event_param))) | |
362 | return -EFAULT; | |
30bdb6e4 | 363 | event_param.name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 364 | switch (event_param.instrumentation) { |
ab2277d6 | 365 | case LTTNG_KERNEL_KPROBE: |
e0a7a7c4 MD |
366 | event_param.u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
367 | break; | |
ab2277d6 | 368 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
369 | event_param.u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
370 | break; | |
371 | default: | |
372 | break; | |
373 | } | |
1c25284c | 374 | event_fd = get_unused_fd(); |
653fe716 MD |
375 | if (event_fd < 0) { |
376 | ret = event_fd; | |
377 | goto fd_error; | |
378 | } | |
c0e31d2e | 379 | event_file = anon_inode_getfile("[lttng_event]", |
3b923e5b | 380 | <tng_event_fops, |
03037b98 | 381 | NULL, O_RDWR); |
c0e31d2e MD |
382 | if (IS_ERR(event_file)) { |
383 | ret = PTR_ERR(event_file); | |
653fe716 MD |
384 | goto file_error; |
385 | } | |
03037b98 MD |
386 | /* |
387 | * We tolerate no failure path after event creation. It will stay | |
388 | * invariant for the rest of the session. | |
389 | */ | |
30bdb6e4 | 390 | event = ltt_event_create(channel, &event_param, NULL); |
03037b98 | 391 | if (!event) { |
03037b98 | 392 | ret = -EEXIST; |
d6d808f3 | 393 | goto event_error; |
03037b98 | 394 | } |
c0e31d2e MD |
395 | event_file->private_data = event; |
396 | fd_install(event_fd, event_file); | |
653fe716 | 397 | /* The event holds a reference on the channel */ |
b0caa15a | 398 | atomic_long_inc(&channel_file->f_count); |
653fe716 MD |
399 | return event_fd; |
400 | ||
03037b98 | 401 | event_error: |
c0e31d2e | 402 | fput(event_file); |
653fe716 MD |
403 | file_error: |
404 | put_unused_fd(event_fd); | |
405 | fd_error: | |
653fe716 MD |
406 | return ret; |
407 | } | |
ad1c05e1 MD |
408 | |
409 | /** | |
410 | * lttng_channel_ioctl - lttng syscall through ioctl | |
411 | * | |
c0e31d2e | 412 | * @file: the file |
ad1c05e1 MD |
413 | * @cmd: the command |
414 | * @arg: command arg | |
415 | * | |
416 | * This ioctl implements lttng commands: | |
38d024ae | 417 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
418 | * Returns an event stream file descriptor or failure. |
419 | * (typically, one event stream records events from one CPU) | |
38d024ae | 420 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 421 | * Returns an event file descriptor or failure. |
baf20995 | 422 | * |
baf20995 MD |
423 | * Channel and event file descriptors also hold a reference on the session. |
424 | */ | |
ad1c05e1 | 425 | static |
c0e31d2e | 426 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 427 | { |
baf20995 | 428 | switch (cmd) { |
38d024ae | 429 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 430 | return lttng_abi_open_stream(file); |
38d024ae MD |
431 | case LTTNG_KERNEL_EVENT: |
432 | return lttng_abi_create_event(file, (struct lttng_kernel_event __user *) arg); | |
baf20995 MD |
433 | default: |
434 | return -ENOIOCTLCMD; | |
435 | } | |
436 | } | |
437 | ||
5dbbdb43 MD |
438 | /** |
439 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
440 | * | |
441 | * @file: the file | |
442 | * @cmd: the command | |
443 | * @arg: command arg | |
444 | * | |
445 | * This ioctl implements lttng commands: | |
38d024ae | 446 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
447 | * Returns an event stream file descriptor or failure. |
448 | * | |
449 | * Channel and event file descriptors also hold a reference on the session. | |
450 | */ | |
451 | static | |
452 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
453 | { | |
454 | switch (cmd) { | |
38d024ae | 455 | case LTTNG_KERNEL_STREAM: |
5dbbdb43 MD |
456 | return lttng_abi_open_stream(file); |
457 | default: | |
458 | return -ENOIOCTLCMD; | |
459 | } | |
460 | } | |
461 | ||
3b923e5b MD |
462 | /* TODO: poll */ |
463 | #if 0 | |
653fe716 MD |
464 | /** |
465 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
466 | * | |
c0e31d2e | 467 | * @file: the file |
653fe716 MD |
468 | * @wait: poll table |
469 | */ | |
c0e31d2e | 470 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 471 | { |
c0e31d2e | 472 | struct ltt_channel *channel = file->private_data; |
653fe716 MD |
473 | unsigned int mask = 0; |
474 | ||
c0e31d2e | 475 | if (file->f_mode & FMODE_READ) { |
653fe716 | 476 | poll_wait_set_exclusive(wait); |
c0e31d2e | 477 | poll_wait(file, &channel->notify_wait, wait); |
653fe716 MD |
478 | |
479 | /* TODO: identify when the channel is being finalized. */ | |
480 | if (finalized) | |
481 | return POLLHUP; | |
482 | else | |
483 | return POLLIN | POLLRDNORM; | |
484 | } | |
485 | return mask; | |
486 | ||
487 | } | |
3b923e5b | 488 | #endif //0 |
653fe716 | 489 | |
0a84a57f MD |
490 | static |
491 | int lttng_channel_release(struct inode *inode, struct file *file) | |
492 | { | |
493 | struct ltt_channel *channel = file->private_data; | |
c269fff4 MD |
494 | |
495 | if (channel) | |
496 | fput(channel->session->file); | |
0a84a57f MD |
497 | return 0; |
498 | } | |
499 | ||
ad1c05e1 | 500 | static const struct file_operations lttng_channel_fops = { |
03037b98 | 501 | .release = lttng_channel_release, |
3b923e5b MD |
502 | /* TODO */ |
503 | #if 0 | |
653fe716 | 504 | .poll = lttng_channel_poll, |
3b923e5b | 505 | #endif //0 |
ad1c05e1 | 506 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 507 | #ifdef CONFIG_COMPAT |
03037b98 | 508 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 509 | #endif |
11b5a3c2 | 510 | }; |
baf20995 | 511 | |
5dbbdb43 MD |
512 | static const struct file_operations lttng_metadata_fops = { |
513 | .release = lttng_channel_release, | |
514 | .unlocked_ioctl = lttng_metadata_ioctl, | |
515 | #ifdef CONFIG_COMPAT | |
516 | .compat_ioctl = lttng_metadata_ioctl, | |
517 | #endif | |
518 | }; | |
519 | ||
0a84a57f MD |
520 | static |
521 | int lttng_event_release(struct inode *inode, struct file *file) | |
522 | { | |
523 | struct ltt_event *event = file->private_data; | |
c269fff4 | 524 | |
aa7c23a9 | 525 | if (event) |
c269fff4 | 526 | fput(event->chan->file); |
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 | } |