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 | } | |
30f18bf0 | 98 | |
271b6681 MD |
99 | tracepoint_list_file = anon_inode_getfile("[lttng_session]", |
100 | <tng_tracepoint_list_fops, | |
101 | NULL, O_RDWR); | |
102 | if (IS_ERR(tracepoint_list_file)) { | |
103 | ret = PTR_ERR(tracepoint_list_file); | |
104 | goto file_error; | |
105 | } | |
30f18bf0 MD |
106 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
107 | if (ret < 0) | |
108 | goto open_error; | |
271b6681 | 109 | fd_install(file_fd, tracepoint_list_file); |
30f18bf0 MD |
110 | if (file_fd < 0) { |
111 | ret = file_fd; | |
112 | goto fd_error; | |
113 | } | |
271b6681 MD |
114 | return file_fd; |
115 | ||
30f18bf0 MD |
116 | open_error: |
117 | fput(tracepoint_list_file); | |
271b6681 MD |
118 | file_error: |
119 | put_unused_fd(file_fd); | |
120 | fd_error: | |
121 | return ret; | |
122 | } | |
123 | ||
80c16bcf MD |
124 | static |
125 | long lttng_abi_tracer_version(struct file *file, | |
126 | struct lttng_kernel_tracer_version __user *uversion_param) | |
127 | { | |
128 | struct lttng_kernel_tracer_version v; | |
129 | ||
130 | v.version = LTTNG_VERSION; | |
131 | v.patchlevel = LTTNG_PATCHLEVEL; | |
132 | v.sublevel = LTTNG_SUBLEVEL; | |
133 | ||
134 | if (copy_to_user(uversion_param, &v, sizeof(v))) | |
135 | return -EFAULT; | |
136 | return 0; | |
137 | } | |
138 | ||
ad1c05e1 MD |
139 | /** |
140 | * lttng_ioctl - lttng syscall through ioctl | |
141 | * | |
c0e31d2e | 142 | * @file: the file |
ad1c05e1 MD |
143 | * @cmd: the command |
144 | * @arg: command arg | |
145 | * | |
146 | * This ioctl implements lttng commands: | |
38d024ae | 147 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 148 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
149 | * LTTNG_KERNEL_TRACER_VERSION |
150 | * Returns the LTTng kernel tracer version | |
151 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
152 | * Returns a file descriptor listing available tracepoints | |
ad1c05e1 MD |
153 | * |
154 | * The returned session will be deleted when its file descriptor is closed. | |
155 | */ | |
156 | static | |
c0e31d2e | 157 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
158 | { |
159 | switch (cmd) { | |
38d024ae | 160 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 161 | return lttng_abi_create_session(); |
80c16bcf MD |
162 | case LTTNG_KERNEL_TRACER_VERSION: |
163 | return lttng_abi_tracer_version(file, | |
164 | (struct lttng_kernel_tracer_version __user *) arg); | |
271b6681 MD |
165 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
166 | return lttng_abi_tracepoint_list(); | |
ad1c05e1 MD |
167 | default: |
168 | return -ENOIOCTLCMD; | |
169 | } | |
170 | } | |
171 | ||
ad1c05e1 MD |
172 | static const struct file_operations lttng_fops = { |
173 | .unlocked_ioctl = lttng_ioctl, | |
174 | #ifdef CONFIG_COMPAT | |
03037b98 | 175 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 176 | #endif |
11b5a3c2 | 177 | }; |
ad1c05e1 | 178 | |
5dbbdb43 MD |
179 | /* |
180 | * We tolerate no failure in this function (if one happens, we print a dmesg | |
181 | * error, but cannot return any error, because the channel information is | |
182 | * invariant. | |
183 | */ | |
184 | static | |
185 | void lttng_metadata_create_events(struct file *channel_file) | |
186 | { | |
187 | struct ltt_channel *channel = channel_file->private_data; | |
e70a4758 | 188 | static struct lttng_kernel_event metadata_params = { |
ab2277d6 | 189 | .instrumentation = LTTNG_KERNEL_TRACEPOINT, |
e70a4758 MD |
190 | .name = "lttng_metadata", |
191 | }; | |
5dbbdb43 MD |
192 | struct ltt_event *event; |
193 | int ret; | |
5dbbdb43 | 194 | |
5dbbdb43 MD |
195 | /* |
196 | * We tolerate no failure path after event creation. It will stay | |
197 | * invariant for the rest of the session. | |
198 | */ | |
30bdb6e4 | 199 | event = ltt_event_create(channel, &metadata_params, NULL); |
5dbbdb43 | 200 | if (!event) { |
588e6a7f | 201 | ret = -EINVAL; |
271b6681 | 202 | goto create_error; |
5dbbdb43 MD |
203 | } |
204 | return; | |
205 | ||
85a9ca7f | 206 | create_error: |
5dbbdb43 MD |
207 | WARN_ON(1); |
208 | return; /* not allowed to return error */ | |
209 | } | |
210 | ||
211 | static | |
c0e31d2e | 212 | int lttng_abi_create_channel(struct file *session_file, |
38d024ae | 213 | struct lttng_kernel_channel __user *uchan_param, |
5dbbdb43 | 214 | enum channel_type channel_type) |
baf20995 | 215 | { |
c0e31d2e | 216 | struct ltt_session *session = session_file->private_data; |
5dbbdb43 MD |
217 | const struct file_operations *fops; |
218 | const char *transport_name; | |
baf20995 | 219 | struct ltt_channel *chan; |
c0e31d2e | 220 | struct file *chan_file; |
38d024ae | 221 | struct lttng_kernel_channel chan_param; |
baf20995 | 222 | int chan_fd; |
ad1c05e1 | 223 | int ret = 0; |
baf20995 | 224 | |
653fe716 | 225 | if (copy_from_user(&chan_param, uchan_param, sizeof(chan_param))) |
baf20995 | 226 | return -EFAULT; |
1c25284c | 227 | chan_fd = get_unused_fd(); |
baf20995 MD |
228 | if (chan_fd < 0) { |
229 | ret = chan_fd; | |
230 | goto fd_error; | |
231 | } | |
c0e31d2e | 232 | chan_file = anon_inode_getfile("[lttng_channel]", |
ad1c05e1 | 233 | <tng_channel_fops, |
03037b98 | 234 | NULL, O_RDWR); |
c0e31d2e MD |
235 | if (IS_ERR(chan_file)) { |
236 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
237 | goto file_error; |
238 | } | |
5dbbdb43 MD |
239 | switch (channel_type) { |
240 | case PER_CPU_CHANNEL: | |
241 | transport_name = chan_param.overwrite ? | |
242 | "relay-overwrite" : "relay-discard"; | |
243 | fops = <tng_channel_fops; | |
244 | break; | |
5dbbdb43 | 245 | case METADATA_CHANNEL: |
881833e3 | 246 | transport_name = "relay-metadata"; |
5dbbdb43 MD |
247 | fops = <tng_metadata_fops; |
248 | break; | |
249 | default: | |
250 | transport_name = "<unknown>"; | |
251 | break; | |
252 | } | |
03037b98 MD |
253 | /* |
254 | * We tolerate no failure path after channel creation. It will stay | |
255 | * invariant for the rest of the session. | |
256 | */ | |
5dbbdb43 | 257 | chan = ltt_channel_create(session, transport_name, NULL, |
11b5a3c2 MD |
258 | chan_param.subbuf_size, |
259 | chan_param.num_subbuf, | |
260 | chan_param.switch_timer_interval, | |
261 | chan_param.read_timer_interval); | |
03037b98 | 262 | if (!chan) { |
f3d01b96 | 263 | ret = -EINVAL; |
03037b98 MD |
264 | goto chan_error; |
265 | } | |
11b5a3c2 | 266 | chan->file = chan_file; |
c0e31d2e MD |
267 | chan_file->private_data = chan; |
268 | fd_install(chan_fd, chan_file); | |
cd4bd11f | 269 | if (channel_type == METADATA_CHANNEL) { |
cd4bd11f | 270 | session->metadata = chan; |
4f1c3952 | 271 | lttng_metadata_create_events(chan_file); |
cd4bd11f | 272 | } |
5dbbdb43 | 273 | |
ad1c05e1 | 274 | /* The channel created holds a reference on the session */ |
b0caa15a | 275 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 276 | |
baf20995 MD |
277 | return chan_fd; |
278 | ||
03037b98 | 279 | chan_error: |
c0e31d2e | 280 | fput(chan_file); |
baf20995 MD |
281 | file_error: |
282 | put_unused_fd(chan_fd); | |
283 | fd_error: | |
baf20995 MD |
284 | return ret; |
285 | } | |
286 | ||
287 | /** | |
ad1c05e1 | 288 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 289 | * |
c0e31d2e | 290 | * @file: the file |
baf20995 MD |
291 | * @cmd: the command |
292 | * @arg: command arg | |
293 | * | |
294 | * This ioctl implements lttng commands: | |
38d024ae | 295 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 296 | * Returns a LTTng channel file descriptor |
ad1c05e1 MD |
297 | * |
298 | * The returned channel will be deleted when its file descriptor is closed. | |
299 | */ | |
300 | static | |
c0e31d2e | 301 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 302 | { |
c0e31d2e MD |
303 | struct ltt_session *session = file->private_data; |
304 | ||
ad1c05e1 | 305 | switch (cmd) { |
38d024ae | 306 | case LTTNG_KERNEL_CHANNEL: |
5dbbdb43 | 307 | return lttng_abi_create_channel(file, |
38d024ae | 308 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 309 | PER_CPU_CHANNEL); |
38d024ae | 310 | case LTTNG_KERNEL_SESSION_START: |
c0e31d2e | 311 | return ltt_session_start(session); |
38d024ae | 312 | case LTTNG_KERNEL_SESSION_STOP: |
c0e31d2e | 313 | return ltt_session_stop(session); |
38d024ae | 314 | case LTTNG_KERNEL_METADATA: |
5dbbdb43 | 315 | return lttng_abi_create_channel(file, |
38d024ae | 316 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 317 | METADATA_CHANNEL); |
ad1c05e1 MD |
318 | default: |
319 | return -ENOIOCTLCMD; | |
320 | } | |
321 | } | |
322 | ||
03037b98 MD |
323 | /* |
324 | * Called when the last file reference is dropped. | |
325 | * | |
326 | * Big fat note: channels and events are invariant for the whole session after | |
327 | * their creation. So this session destruction also destroys all channel and | |
328 | * event structures specific to this session (they are not destroyed when their | |
329 | * individual file is released). | |
330 | */ | |
ad1c05e1 | 331 | static |
03037b98 | 332 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 333 | { |
03037b98 | 334 | struct ltt_session *session = file->private_data; |
c269fff4 MD |
335 | |
336 | if (session) | |
337 | ltt_session_destroy(session); | |
11b5a3c2 | 338 | return 0; |
ad1c05e1 | 339 | } |
ad1c05e1 MD |
340 | |
341 | static const struct file_operations lttng_session_fops = { | |
03037b98 | 342 | .release = lttng_session_release, |
ad1c05e1 MD |
343 | .unlocked_ioctl = lttng_session_ioctl, |
344 | #ifdef CONFIG_COMPAT | |
03037b98 | 345 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 346 | #endif |
11b5a3c2 | 347 | }; |
ad1c05e1 MD |
348 | |
349 | static | |
c0e31d2e | 350 | int lttng_abi_open_stream(struct file *channel_file) |
ad1c05e1 | 351 | { |
c0e31d2e | 352 | struct ltt_channel *channel = channel_file->private_data; |
ad1c05e1 MD |
353 | struct lib_ring_buffer *buf; |
354 | int stream_fd, ret; | |
11b5a3c2 | 355 | struct file *stream_file; |
ad1c05e1 | 356 | |
11b5a3c2 | 357 | buf = channel->ops->buffer_read_open(channel->chan); |
ad1c05e1 MD |
358 | if (!buf) |
359 | return -ENOENT; | |
360 | ||
1c25284c | 361 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
362 | if (stream_fd < 0) { |
363 | ret = stream_fd; | |
364 | goto fd_error; | |
365 | } | |
c0e31d2e | 366 | stream_file = anon_inode_getfile("[lttng_stream]", |
7f57c73c | 367 | &lib_ring_buffer_file_operations, |
ad1c05e1 | 368 | buf, O_RDWR); |
c0e31d2e MD |
369 | if (IS_ERR(stream_file)) { |
370 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
371 | goto file_error; |
372 | } | |
409453cb MD |
373 | /* |
374 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
375 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
376 | * file descriptor, so we set FMODE_PREAD here. | |
377 | */ | |
d7b6f197 | 378 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 379 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
380 | /* |
381 | * The stream holds a reference to the channel within the generic ring | |
382 | * buffer library, so no need to hold a refcount on the channel and | |
383 | * session files here. | |
384 | */ | |
ad1c05e1 MD |
385 | return stream_fd; |
386 | ||
387 | file_error: | |
388 | put_unused_fd(stream_fd); | |
389 | fd_error: | |
11b5a3c2 | 390 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
391 | return ret; |
392 | } | |
393 | ||
653fe716 | 394 | static |
c0e31d2e | 395 | int lttng_abi_create_event(struct file *channel_file, |
38d024ae | 396 | struct lttng_kernel_event __user *uevent_param) |
653fe716 | 397 | { |
c0e31d2e | 398 | struct ltt_channel *channel = channel_file->private_data; |
653fe716 | 399 | struct ltt_event *event; |
38d024ae | 400 | struct lttng_kernel_event event_param; |
653fe716 | 401 | int event_fd, ret; |
11b5a3c2 | 402 | struct file *event_file; |
653fe716 MD |
403 | |
404 | if (copy_from_user(&event_param, uevent_param, sizeof(event_param))) | |
405 | return -EFAULT; | |
30bdb6e4 | 406 | event_param.name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 407 | switch (event_param.instrumentation) { |
ab2277d6 | 408 | case LTTNG_KERNEL_KPROBE: |
e0a7a7c4 MD |
409 | event_param.u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
410 | break; | |
ab2277d6 | 411 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
412 | event_param.u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
413 | break; | |
414 | default: | |
415 | break; | |
416 | } | |
1c25284c | 417 | event_fd = get_unused_fd(); |
653fe716 MD |
418 | if (event_fd < 0) { |
419 | ret = event_fd; | |
420 | goto fd_error; | |
421 | } | |
c0e31d2e | 422 | event_file = anon_inode_getfile("[lttng_event]", |
3b923e5b | 423 | <tng_event_fops, |
03037b98 | 424 | NULL, O_RDWR); |
c0e31d2e MD |
425 | if (IS_ERR(event_file)) { |
426 | ret = PTR_ERR(event_file); | |
653fe716 MD |
427 | goto file_error; |
428 | } | |
03037b98 MD |
429 | /* |
430 | * We tolerate no failure path after event creation. It will stay | |
431 | * invariant for the rest of the session. | |
432 | */ | |
30bdb6e4 | 433 | event = ltt_event_create(channel, &event_param, NULL); |
03037b98 | 434 | if (!event) { |
271b6681 | 435 | ret = -EINVAL; |
d6d808f3 | 436 | goto event_error; |
03037b98 | 437 | } |
c0e31d2e MD |
438 | event_file->private_data = event; |
439 | fd_install(event_fd, event_file); | |
653fe716 | 440 | /* The event holds a reference on the channel */ |
b0caa15a | 441 | atomic_long_inc(&channel_file->f_count); |
653fe716 MD |
442 | return event_fd; |
443 | ||
03037b98 | 444 | event_error: |
c0e31d2e | 445 | fput(event_file); |
653fe716 MD |
446 | file_error: |
447 | put_unused_fd(event_fd); | |
448 | fd_error: | |
653fe716 MD |
449 | return ret; |
450 | } | |
ad1c05e1 MD |
451 | |
452 | /** | |
453 | * lttng_channel_ioctl - lttng syscall through ioctl | |
454 | * | |
c0e31d2e | 455 | * @file: the file |
ad1c05e1 MD |
456 | * @cmd: the command |
457 | * @arg: command arg | |
458 | * | |
459 | * This ioctl implements lttng commands: | |
38d024ae | 460 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
461 | * Returns an event stream file descriptor or failure. |
462 | * (typically, one event stream records events from one CPU) | |
38d024ae | 463 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 464 | * Returns an event file descriptor or failure. |
baf20995 | 465 | * |
baf20995 MD |
466 | * Channel and event file descriptors also hold a reference on the session. |
467 | */ | |
ad1c05e1 | 468 | static |
c0e31d2e | 469 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 470 | { |
baf20995 | 471 | switch (cmd) { |
38d024ae | 472 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 473 | return lttng_abi_open_stream(file); |
38d024ae MD |
474 | case LTTNG_KERNEL_EVENT: |
475 | return lttng_abi_create_event(file, (struct lttng_kernel_event __user *) arg); | |
baf20995 MD |
476 | default: |
477 | return -ENOIOCTLCMD; | |
478 | } | |
479 | } | |
480 | ||
5dbbdb43 MD |
481 | /** |
482 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
483 | * | |
484 | * @file: the file | |
485 | * @cmd: the command | |
486 | * @arg: command arg | |
487 | * | |
488 | * This ioctl implements lttng commands: | |
38d024ae | 489 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
490 | * Returns an event stream file descriptor or failure. |
491 | * | |
492 | * Channel and event file descriptors also hold a reference on the session. | |
493 | */ | |
494 | static | |
495 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
496 | { | |
497 | switch (cmd) { | |
38d024ae | 498 | case LTTNG_KERNEL_STREAM: |
5dbbdb43 MD |
499 | return lttng_abi_open_stream(file); |
500 | default: | |
501 | return -ENOIOCTLCMD; | |
502 | } | |
503 | } | |
504 | ||
3b923e5b MD |
505 | /* TODO: poll */ |
506 | #if 0 | |
653fe716 MD |
507 | /** |
508 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
509 | * | |
c0e31d2e | 510 | * @file: the file |
653fe716 MD |
511 | * @wait: poll table |
512 | */ | |
c0e31d2e | 513 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 514 | { |
c0e31d2e | 515 | struct ltt_channel *channel = file->private_data; |
653fe716 MD |
516 | unsigned int mask = 0; |
517 | ||
c0e31d2e | 518 | if (file->f_mode & FMODE_READ) { |
653fe716 | 519 | poll_wait_set_exclusive(wait); |
c0e31d2e | 520 | poll_wait(file, &channel->notify_wait, wait); |
653fe716 MD |
521 | |
522 | /* TODO: identify when the channel is being finalized. */ | |
523 | if (finalized) | |
524 | return POLLHUP; | |
525 | else | |
526 | return POLLIN | POLLRDNORM; | |
527 | } | |
528 | return mask; | |
529 | ||
530 | } | |
3b923e5b | 531 | #endif //0 |
653fe716 | 532 | |
0a84a57f MD |
533 | static |
534 | int lttng_channel_release(struct inode *inode, struct file *file) | |
535 | { | |
536 | struct ltt_channel *channel = file->private_data; | |
c269fff4 MD |
537 | |
538 | if (channel) | |
539 | fput(channel->session->file); | |
0a84a57f MD |
540 | return 0; |
541 | } | |
542 | ||
ad1c05e1 | 543 | static const struct file_operations lttng_channel_fops = { |
03037b98 | 544 | .release = lttng_channel_release, |
3b923e5b MD |
545 | /* TODO */ |
546 | #if 0 | |
653fe716 | 547 | .poll = lttng_channel_poll, |
3b923e5b | 548 | #endif //0 |
ad1c05e1 | 549 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 550 | #ifdef CONFIG_COMPAT |
03037b98 | 551 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 552 | #endif |
11b5a3c2 | 553 | }; |
baf20995 | 554 | |
5dbbdb43 MD |
555 | static const struct file_operations lttng_metadata_fops = { |
556 | .release = lttng_channel_release, | |
557 | .unlocked_ioctl = lttng_metadata_ioctl, | |
558 | #ifdef CONFIG_COMPAT | |
559 | .compat_ioctl = lttng_metadata_ioctl, | |
560 | #endif | |
561 | }; | |
562 | ||
0a84a57f MD |
563 | static |
564 | int lttng_event_release(struct inode *inode, struct file *file) | |
565 | { | |
566 | struct ltt_event *event = file->private_data; | |
c269fff4 | 567 | |
aa7c23a9 | 568 | if (event) |
c269fff4 | 569 | fput(event->chan->file); |
0a84a57f MD |
570 | return 0; |
571 | } | |
572 | ||
3b923e5b | 573 | /* TODO: filter control ioctl */ |
0a84a57f MD |
574 | static const struct file_operations lttng_event_fops = { |
575 | .release = lttng_event_release, | |
11b5a3c2 | 576 | }; |
0a84a57f | 577 | |
1c25284c | 578 | int __init ltt_debugfs_abi_init(void) |
baf20995 MD |
579 | { |
580 | int ret = 0; | |
581 | ||
6d2a620c | 582 | wrapper_vmalloc_sync_all(); |
11b5a3c2 | 583 | lttng_dentry = debugfs_create_file("lttng", S_IWUSR, NULL, NULL, |
f3d01b96 | 584 | <tng_fops); |
11b5a3c2 | 585 | if (IS_ERR(lttng_dentry) || !lttng_dentry) { |
baf20995 MD |
586 | printk(KERN_ERR "Error creating LTTng control file\n"); |
587 | ret = -ENOMEM; | |
588 | goto error; | |
589 | } | |
590 | error: | |
591 | return ret; | |
592 | } | |
593 | ||
1c25284c | 594 | void __exit ltt_debugfs_abi_exit(void) |
baf20995 | 595 | { |
11b5a3c2 | 596 | debugfs_remove(lttng_dentry); |
baf20995 | 597 | } |