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 | ||
271b6681 MD |
87 | static |
88 | int lttng_abi_tracepoint_list(void) | |
89 | { | |
90 | struct file *tracepoint_list_file; | |
91 | int file_fd, ret; | |
92 | ||
93 | file_fd = get_unused_fd(); | |
94 | if (file_fd < 0) { | |
95 | ret = file_fd; | |
96 | goto fd_error; | |
97 | } | |
98 | tracepoint_list_file = anon_inode_getfile("[lttng_session]", | |
99 | <tng_tracepoint_list_fops, | |
100 | NULL, O_RDWR); | |
101 | if (IS_ERR(tracepoint_list_file)) { | |
102 | ret = PTR_ERR(tracepoint_list_file); | |
103 | goto file_error; | |
104 | } | |
105 | fd_install(file_fd, tracepoint_list_file); | |
106 | return file_fd; | |
107 | ||
108 | file_error: | |
109 | put_unused_fd(file_fd); | |
110 | fd_error: | |
111 | return ret; | |
112 | } | |
113 | ||
80c16bcf MD |
114 | static |
115 | long lttng_abi_tracer_version(struct file *file, | |
116 | struct lttng_kernel_tracer_version __user *uversion_param) | |
117 | { | |
118 | struct lttng_kernel_tracer_version v; | |
119 | ||
120 | v.version = LTTNG_VERSION; | |
121 | v.patchlevel = LTTNG_PATCHLEVEL; | |
122 | v.sublevel = LTTNG_SUBLEVEL; | |
123 | ||
124 | if (copy_to_user(uversion_param, &v, sizeof(v))) | |
125 | return -EFAULT; | |
126 | return 0; | |
127 | } | |
128 | ||
ad1c05e1 MD |
129 | /** |
130 | * lttng_ioctl - lttng syscall through ioctl | |
131 | * | |
c0e31d2e | 132 | * @file: the file |
ad1c05e1 MD |
133 | * @cmd: the command |
134 | * @arg: command arg | |
135 | * | |
136 | * This ioctl implements lttng commands: | |
38d024ae | 137 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 138 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
139 | * LTTNG_KERNEL_TRACER_VERSION |
140 | * Returns the LTTng kernel tracer version | |
141 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
142 | * Returns a file descriptor listing available tracepoints | |
ad1c05e1 MD |
143 | * |
144 | * The returned session will be deleted when its file descriptor is closed. | |
145 | */ | |
146 | static | |
c0e31d2e | 147 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
148 | { |
149 | switch (cmd) { | |
38d024ae | 150 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 151 | return lttng_abi_create_session(); |
80c16bcf MD |
152 | case LTTNG_KERNEL_TRACER_VERSION: |
153 | return lttng_abi_tracer_version(file, | |
154 | (struct lttng_kernel_tracer_version __user *) arg); | |
271b6681 MD |
155 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
156 | return lttng_abi_tracepoint_list(); | |
ad1c05e1 MD |
157 | default: |
158 | return -ENOIOCTLCMD; | |
159 | } | |
160 | } | |
161 | ||
ad1c05e1 MD |
162 | static const struct file_operations lttng_fops = { |
163 | .unlocked_ioctl = lttng_ioctl, | |
164 | #ifdef CONFIG_COMPAT | |
03037b98 | 165 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 166 | #endif |
11b5a3c2 | 167 | }; |
ad1c05e1 | 168 | |
5dbbdb43 MD |
169 | /* |
170 | * We tolerate no failure in this function (if one happens, we print a dmesg | |
171 | * error, but cannot return any error, because the channel information is | |
172 | * invariant. | |
173 | */ | |
174 | static | |
175 | void lttng_metadata_create_events(struct file *channel_file) | |
176 | { | |
177 | struct ltt_channel *channel = channel_file->private_data; | |
e70a4758 | 178 | static struct lttng_kernel_event metadata_params = { |
ab2277d6 | 179 | .instrumentation = LTTNG_KERNEL_TRACEPOINT, |
e70a4758 MD |
180 | .name = "lttng_metadata", |
181 | }; | |
5dbbdb43 MD |
182 | struct ltt_event *event; |
183 | int ret; | |
5dbbdb43 | 184 | |
5dbbdb43 MD |
185 | /* |
186 | * We tolerate no failure path after event creation. It will stay | |
187 | * invariant for the rest of the session. | |
188 | */ | |
30bdb6e4 | 189 | event = ltt_event_create(channel, &metadata_params, NULL); |
5dbbdb43 | 190 | if (!event) { |
588e6a7f | 191 | ret = -EINVAL; |
271b6681 | 192 | goto create_error; |
5dbbdb43 MD |
193 | } |
194 | return; | |
195 | ||
85a9ca7f | 196 | create_error: |
5dbbdb43 MD |
197 | WARN_ON(1); |
198 | return; /* not allowed to return error */ | |
199 | } | |
200 | ||
201 | static | |
c0e31d2e | 202 | int lttng_abi_create_channel(struct file *session_file, |
38d024ae | 203 | struct lttng_kernel_channel __user *uchan_param, |
5dbbdb43 | 204 | enum channel_type channel_type) |
baf20995 | 205 | { |
c0e31d2e | 206 | struct ltt_session *session = session_file->private_data; |
5dbbdb43 MD |
207 | const struct file_operations *fops; |
208 | const char *transport_name; | |
baf20995 | 209 | struct ltt_channel *chan; |
c0e31d2e | 210 | struct file *chan_file; |
38d024ae | 211 | struct lttng_kernel_channel chan_param; |
baf20995 | 212 | int chan_fd; |
ad1c05e1 | 213 | int ret = 0; |
baf20995 | 214 | |
653fe716 | 215 | if (copy_from_user(&chan_param, uchan_param, sizeof(chan_param))) |
baf20995 | 216 | return -EFAULT; |
1c25284c | 217 | chan_fd = get_unused_fd(); |
baf20995 MD |
218 | if (chan_fd < 0) { |
219 | ret = chan_fd; | |
220 | goto fd_error; | |
221 | } | |
c0e31d2e | 222 | chan_file = anon_inode_getfile("[lttng_channel]", |
ad1c05e1 | 223 | <tng_channel_fops, |
03037b98 | 224 | NULL, O_RDWR); |
c0e31d2e MD |
225 | if (IS_ERR(chan_file)) { |
226 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
227 | goto file_error; |
228 | } | |
5dbbdb43 MD |
229 | switch (channel_type) { |
230 | case PER_CPU_CHANNEL: | |
231 | transport_name = chan_param.overwrite ? | |
232 | "relay-overwrite" : "relay-discard"; | |
233 | fops = <tng_channel_fops; | |
234 | break; | |
5dbbdb43 | 235 | case METADATA_CHANNEL: |
881833e3 | 236 | transport_name = "relay-metadata"; |
5dbbdb43 MD |
237 | fops = <tng_metadata_fops; |
238 | break; | |
239 | default: | |
240 | transport_name = "<unknown>"; | |
241 | break; | |
242 | } | |
03037b98 MD |
243 | /* |
244 | * We tolerate no failure path after channel creation. It will stay | |
245 | * invariant for the rest of the session. | |
246 | */ | |
5dbbdb43 | 247 | chan = ltt_channel_create(session, transport_name, NULL, |
11b5a3c2 MD |
248 | chan_param.subbuf_size, |
249 | chan_param.num_subbuf, | |
250 | chan_param.switch_timer_interval, | |
251 | chan_param.read_timer_interval); | |
03037b98 | 252 | if (!chan) { |
f3d01b96 | 253 | ret = -EINVAL; |
03037b98 MD |
254 | goto chan_error; |
255 | } | |
11b5a3c2 | 256 | chan->file = chan_file; |
c0e31d2e MD |
257 | chan_file->private_data = chan; |
258 | fd_install(chan_fd, chan_file); | |
cd4bd11f | 259 | if (channel_type == METADATA_CHANNEL) { |
cd4bd11f | 260 | session->metadata = chan; |
4f1c3952 | 261 | lttng_metadata_create_events(chan_file); |
cd4bd11f | 262 | } |
5dbbdb43 | 263 | |
ad1c05e1 | 264 | /* The channel created holds a reference on the session */ |
b0caa15a | 265 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 266 | |
baf20995 MD |
267 | return chan_fd; |
268 | ||
03037b98 | 269 | chan_error: |
c0e31d2e | 270 | fput(chan_file); |
baf20995 MD |
271 | file_error: |
272 | put_unused_fd(chan_fd); | |
273 | fd_error: | |
baf20995 MD |
274 | return ret; |
275 | } | |
276 | ||
277 | /** | |
ad1c05e1 | 278 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 279 | * |
c0e31d2e | 280 | * @file: the file |
baf20995 MD |
281 | * @cmd: the command |
282 | * @arg: command arg | |
283 | * | |
284 | * This ioctl implements lttng commands: | |
38d024ae | 285 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 286 | * Returns a LTTng channel file descriptor |
ad1c05e1 MD |
287 | * |
288 | * The returned channel will be deleted when its file descriptor is closed. | |
289 | */ | |
290 | static | |
c0e31d2e | 291 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 292 | { |
c0e31d2e MD |
293 | struct ltt_session *session = file->private_data; |
294 | ||
ad1c05e1 | 295 | switch (cmd) { |
38d024ae | 296 | case LTTNG_KERNEL_CHANNEL: |
5dbbdb43 | 297 | return lttng_abi_create_channel(file, |
38d024ae | 298 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 299 | PER_CPU_CHANNEL); |
38d024ae | 300 | case LTTNG_KERNEL_SESSION_START: |
c0e31d2e | 301 | return ltt_session_start(session); |
38d024ae | 302 | case LTTNG_KERNEL_SESSION_STOP: |
c0e31d2e | 303 | return ltt_session_stop(session); |
38d024ae | 304 | case LTTNG_KERNEL_METADATA: |
5dbbdb43 | 305 | return lttng_abi_create_channel(file, |
38d024ae | 306 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 307 | METADATA_CHANNEL); |
ad1c05e1 MD |
308 | default: |
309 | return -ENOIOCTLCMD; | |
310 | } | |
311 | } | |
312 | ||
03037b98 MD |
313 | /* |
314 | * Called when the last file reference is dropped. | |
315 | * | |
316 | * Big fat note: channels and events are invariant for the whole session after | |
317 | * their creation. So this session destruction also destroys all channel and | |
318 | * event structures specific to this session (they are not destroyed when their | |
319 | * individual file is released). | |
320 | */ | |
ad1c05e1 | 321 | static |
03037b98 | 322 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 323 | { |
03037b98 | 324 | struct ltt_session *session = file->private_data; |
c269fff4 MD |
325 | |
326 | if (session) | |
327 | ltt_session_destroy(session); | |
11b5a3c2 | 328 | return 0; |
ad1c05e1 | 329 | } |
ad1c05e1 MD |
330 | |
331 | static const struct file_operations lttng_session_fops = { | |
03037b98 | 332 | .release = lttng_session_release, |
ad1c05e1 MD |
333 | .unlocked_ioctl = lttng_session_ioctl, |
334 | #ifdef CONFIG_COMPAT | |
03037b98 | 335 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 336 | #endif |
11b5a3c2 | 337 | }; |
ad1c05e1 MD |
338 | |
339 | static | |
c0e31d2e | 340 | int lttng_abi_open_stream(struct file *channel_file) |
ad1c05e1 | 341 | { |
c0e31d2e | 342 | struct ltt_channel *channel = channel_file->private_data; |
ad1c05e1 MD |
343 | struct lib_ring_buffer *buf; |
344 | int stream_fd, ret; | |
11b5a3c2 | 345 | struct file *stream_file; |
ad1c05e1 | 346 | |
11b5a3c2 | 347 | buf = channel->ops->buffer_read_open(channel->chan); |
ad1c05e1 MD |
348 | if (!buf) |
349 | return -ENOENT; | |
350 | ||
1c25284c | 351 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
352 | if (stream_fd < 0) { |
353 | ret = stream_fd; | |
354 | goto fd_error; | |
355 | } | |
c0e31d2e | 356 | stream_file = anon_inode_getfile("[lttng_stream]", |
7f57c73c | 357 | &lib_ring_buffer_file_operations, |
ad1c05e1 | 358 | buf, O_RDWR); |
c0e31d2e MD |
359 | if (IS_ERR(stream_file)) { |
360 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
361 | goto file_error; |
362 | } | |
409453cb MD |
363 | /* |
364 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
365 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
366 | * file descriptor, so we set FMODE_PREAD here. | |
367 | */ | |
d7b6f197 | 368 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 369 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
370 | /* |
371 | * The stream holds a reference to the channel within the generic ring | |
372 | * buffer library, so no need to hold a refcount on the channel and | |
373 | * session files here. | |
374 | */ | |
ad1c05e1 MD |
375 | return stream_fd; |
376 | ||
377 | file_error: | |
378 | put_unused_fd(stream_fd); | |
379 | fd_error: | |
11b5a3c2 | 380 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
381 | return ret; |
382 | } | |
383 | ||
653fe716 | 384 | static |
c0e31d2e | 385 | int lttng_abi_create_event(struct file *channel_file, |
38d024ae | 386 | struct lttng_kernel_event __user *uevent_param) |
653fe716 | 387 | { |
c0e31d2e | 388 | struct ltt_channel *channel = channel_file->private_data; |
653fe716 | 389 | struct ltt_event *event; |
38d024ae | 390 | struct lttng_kernel_event event_param; |
653fe716 | 391 | int event_fd, ret; |
11b5a3c2 | 392 | struct file *event_file; |
653fe716 MD |
393 | |
394 | if (copy_from_user(&event_param, uevent_param, sizeof(event_param))) | |
395 | return -EFAULT; | |
30bdb6e4 | 396 | event_param.name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 397 | switch (event_param.instrumentation) { |
ab2277d6 | 398 | case LTTNG_KERNEL_KPROBE: |
e0a7a7c4 MD |
399 | event_param.u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
400 | break; | |
ab2277d6 | 401 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
402 | event_param.u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
403 | break; | |
404 | default: | |
405 | break; | |
406 | } | |
1c25284c | 407 | event_fd = get_unused_fd(); |
653fe716 MD |
408 | if (event_fd < 0) { |
409 | ret = event_fd; | |
410 | goto fd_error; | |
411 | } | |
c0e31d2e | 412 | event_file = anon_inode_getfile("[lttng_event]", |
3b923e5b | 413 | <tng_event_fops, |
03037b98 | 414 | NULL, O_RDWR); |
c0e31d2e MD |
415 | if (IS_ERR(event_file)) { |
416 | ret = PTR_ERR(event_file); | |
653fe716 MD |
417 | goto file_error; |
418 | } | |
03037b98 MD |
419 | /* |
420 | * We tolerate no failure path after event creation. It will stay | |
421 | * invariant for the rest of the session. | |
422 | */ | |
30bdb6e4 | 423 | event = ltt_event_create(channel, &event_param, NULL); |
03037b98 | 424 | if (!event) { |
271b6681 | 425 | ret = -EINVAL; |
d6d808f3 | 426 | goto event_error; |
03037b98 | 427 | } |
c0e31d2e MD |
428 | event_file->private_data = event; |
429 | fd_install(event_fd, event_file); | |
653fe716 | 430 | /* The event holds a reference on the channel */ |
b0caa15a | 431 | atomic_long_inc(&channel_file->f_count); |
653fe716 MD |
432 | return event_fd; |
433 | ||
03037b98 | 434 | event_error: |
c0e31d2e | 435 | fput(event_file); |
653fe716 MD |
436 | file_error: |
437 | put_unused_fd(event_fd); | |
438 | fd_error: | |
653fe716 MD |
439 | return ret; |
440 | } | |
ad1c05e1 MD |
441 | |
442 | /** | |
443 | * lttng_channel_ioctl - lttng syscall through ioctl | |
444 | * | |
c0e31d2e | 445 | * @file: the file |
ad1c05e1 MD |
446 | * @cmd: the command |
447 | * @arg: command arg | |
448 | * | |
449 | * This ioctl implements lttng commands: | |
38d024ae | 450 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
451 | * Returns an event stream file descriptor or failure. |
452 | * (typically, one event stream records events from one CPU) | |
38d024ae | 453 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 454 | * Returns an event file descriptor or failure. |
baf20995 | 455 | * |
baf20995 MD |
456 | * Channel and event file descriptors also hold a reference on the session. |
457 | */ | |
ad1c05e1 | 458 | static |
c0e31d2e | 459 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 460 | { |
baf20995 | 461 | switch (cmd) { |
38d024ae | 462 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 463 | return lttng_abi_open_stream(file); |
38d024ae MD |
464 | case LTTNG_KERNEL_EVENT: |
465 | return lttng_abi_create_event(file, (struct lttng_kernel_event __user *) arg); | |
baf20995 MD |
466 | default: |
467 | return -ENOIOCTLCMD; | |
468 | } | |
469 | } | |
470 | ||
5dbbdb43 MD |
471 | /** |
472 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
473 | * | |
474 | * @file: the file | |
475 | * @cmd: the command | |
476 | * @arg: command arg | |
477 | * | |
478 | * This ioctl implements lttng commands: | |
38d024ae | 479 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
480 | * Returns an event stream file descriptor or failure. |
481 | * | |
482 | * Channel and event file descriptors also hold a reference on the session. | |
483 | */ | |
484 | static | |
485 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
486 | { | |
487 | switch (cmd) { | |
38d024ae | 488 | case LTTNG_KERNEL_STREAM: |
5dbbdb43 MD |
489 | return lttng_abi_open_stream(file); |
490 | default: | |
491 | return -ENOIOCTLCMD; | |
492 | } | |
493 | } | |
494 | ||
3b923e5b MD |
495 | /* TODO: poll */ |
496 | #if 0 | |
653fe716 MD |
497 | /** |
498 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
499 | * | |
c0e31d2e | 500 | * @file: the file |
653fe716 MD |
501 | * @wait: poll table |
502 | */ | |
c0e31d2e | 503 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 504 | { |
c0e31d2e | 505 | struct ltt_channel *channel = file->private_data; |
653fe716 MD |
506 | unsigned int mask = 0; |
507 | ||
c0e31d2e | 508 | if (file->f_mode & FMODE_READ) { |
653fe716 | 509 | poll_wait_set_exclusive(wait); |
c0e31d2e | 510 | poll_wait(file, &channel->notify_wait, wait); |
653fe716 MD |
511 | |
512 | /* TODO: identify when the channel is being finalized. */ | |
513 | if (finalized) | |
514 | return POLLHUP; | |
515 | else | |
516 | return POLLIN | POLLRDNORM; | |
517 | } | |
518 | return mask; | |
519 | ||
520 | } | |
3b923e5b | 521 | #endif //0 |
653fe716 | 522 | |
0a84a57f MD |
523 | static |
524 | int lttng_channel_release(struct inode *inode, struct file *file) | |
525 | { | |
526 | struct ltt_channel *channel = file->private_data; | |
c269fff4 MD |
527 | |
528 | if (channel) | |
529 | fput(channel->session->file); | |
0a84a57f MD |
530 | return 0; |
531 | } | |
532 | ||
ad1c05e1 | 533 | static const struct file_operations lttng_channel_fops = { |
03037b98 | 534 | .release = lttng_channel_release, |
3b923e5b MD |
535 | /* TODO */ |
536 | #if 0 | |
653fe716 | 537 | .poll = lttng_channel_poll, |
3b923e5b | 538 | #endif //0 |
ad1c05e1 | 539 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 540 | #ifdef CONFIG_COMPAT |
03037b98 | 541 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 542 | #endif |
11b5a3c2 | 543 | }; |
baf20995 | 544 | |
5dbbdb43 MD |
545 | static const struct file_operations lttng_metadata_fops = { |
546 | .release = lttng_channel_release, | |
547 | .unlocked_ioctl = lttng_metadata_ioctl, | |
548 | #ifdef CONFIG_COMPAT | |
549 | .compat_ioctl = lttng_metadata_ioctl, | |
550 | #endif | |
551 | }; | |
552 | ||
0a84a57f MD |
553 | static |
554 | int lttng_event_release(struct inode *inode, struct file *file) | |
555 | { | |
556 | struct ltt_event *event = file->private_data; | |
c269fff4 | 557 | |
aa7c23a9 | 558 | if (event) |
c269fff4 | 559 | fput(event->chan->file); |
0a84a57f MD |
560 | return 0; |
561 | } | |
562 | ||
3b923e5b | 563 | /* TODO: filter control ioctl */ |
0a84a57f MD |
564 | static const struct file_operations lttng_event_fops = { |
565 | .release = lttng_event_release, | |
11b5a3c2 | 566 | }; |
0a84a57f | 567 | |
1c25284c | 568 | int __init ltt_debugfs_abi_init(void) |
baf20995 MD |
569 | { |
570 | int ret = 0; | |
571 | ||
6d2a620c | 572 | wrapper_vmalloc_sync_all(); |
11b5a3c2 | 573 | lttng_dentry = debugfs_create_file("lttng", S_IWUSR, NULL, NULL, |
f3d01b96 | 574 | <tng_fops); |
11b5a3c2 | 575 | if (IS_ERR(lttng_dentry) || !lttng_dentry) { |
baf20995 MD |
576 | printk(KERN_ERR "Error creating LTTng control file\n"); |
577 | ret = -ENOMEM; | |
578 | goto error; | |
579 | } | |
580 | error: | |
581 | return ret; | |
582 | } | |
583 | ||
1c25284c | 584 | void __exit ltt_debugfs_abi_exit(void) |
baf20995 | 585 | { |
11b5a3c2 | 586 | debugfs_remove(lttng_dentry); |
baf20995 | 587 | } |