#endif
static const struct file_operations lttng_session_fops;
+static const struct file_operations lttng_event_notifier_group_fops;
static const struct file_operations lttng_channel_fops;
static const struct file_operations lttng_metadata_fops;
static const struct file_operations lttng_event_fops;
return ret;
}
+static
+int lttng_abi_create_event_notifier_group(void)
+{
+ struct lttng_event_notifier_group *event_notifier_group;
+ struct file *event_notifier_group_file;
+ int event_notifier_group_fd, ret;
+
+ event_notifier_group = lttng_event_notifier_group_create();
+ if (!event_notifier_group)
+ return -ENOMEM;
+
+ event_notifier_group_fd = lttng_get_unused_fd();
+ if (event_notifier_group_fd < 0) {
+ ret = event_notifier_group_fd;
+ goto fd_error;
+ }
+ event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]",
+ <tng_event_notifier_group_fops,
+ event_notifier_group, O_RDWR);
+ if (IS_ERR(event_notifier_group_file)) {
+ ret = PTR_ERR(event_notifier_group_file);
+ goto file_error;
+ }
+
+ event_notifier_group->file = event_notifier_group_file;
+ fd_install(event_notifier_group_fd, event_notifier_group_file);
+ return event_notifier_group_fd;
+
+file_error:
+ put_unused_fd(event_notifier_group_fd);
+fd_error:
+ lttng_event_notifier_group_destroy(event_notifier_group);
+ return ret;
+}
+
static
int lttng_abi_tracepoint_list(void)
{
* Returns after all previously running probes have completed
* LTTNG_KERNEL_TRACER_ABI_VERSION
* Returns the LTTng kernel tracer ABI version
+ * LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE
+ * Returns a LTTng event notifier group file descriptor
*
* The returned session will be deleted when its file descriptor is closed.
*/
case LTTNG_KERNEL_OLD_SESSION:
case LTTNG_KERNEL_SESSION:
return lttng_abi_create_session();
+ case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE:
+ return lttng_abi_create_event_notifier_group();
case LTTNG_KERNEL_OLD_TRACER_VERSION:
{
struct lttng_kernel_tracer_version v;
static
int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv,
- const struct file_operations *fops)
+ const struct file_operations *fops, const char *name)
{
int stream_fd, ret;
struct file *stream_file;
ret = stream_fd;
goto fd_error;
}
- stream_file = anon_inode_getfile("[lttng_stream]", fops,
- stream_priv, O_RDWR);
+ stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR);
if (IS_ERR(stream_file)) {
ret = PTR_ERR(stream_file);
goto file_error;
stream_priv = buf;
ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
- <tng_stream_ring_buffer_file_operations);
+ <tng_stream_ring_buffer_file_operations,
+ "[lttng_stream]");
if (ret < 0)
goto fd_error;
}
ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
- <tng_metadata_ring_buffer_file_operations);
+ <tng_metadata_ring_buffer_file_operations,
+ "[lttng_metadata_stream]");
if (ret < 0)
goto fd_error;
goto event_error;
if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT
|| event_param->instrumentation == LTTNG_KERNEL_SYSCALL) {
- struct lttng_enabler *enabler;
+ struct lttng_event_enabler *event_enabler;
if (strutils_is_star_glob_pattern(event_param->name)) {
/*
* If the event name is a star globbing pattern,
* we create the special star globbing enabler.
*/
- enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB,
+ event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB,
event_param, channel);
} else {
- enabler = lttng_enabler_create(LTTNG_ENABLER_NAME,
+ event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
event_param, channel);
}
- priv = enabler;
+ priv = event_enabler;
} else {
struct lttng_event *event;
return ret;
}
+static
+long lttng_event_notifier_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+ enum lttng_event_type *evtype = file->private_data;
+
+ switch (cmd) {
+ case LTTNG_KERNEL_ENABLE:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ return -EINVAL;
+ case LTTNG_TYPE_ENABLER:
+ event_notifier_enabler = file->private_data;
+ return lttng_event_notifier_enabler_enable(event_notifier_enabler);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_DISABLE:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ return -EINVAL;
+ case LTTNG_TYPE_ENABLER:
+ event_notifier_enabler = file->private_data;
+ return lttng_event_notifier_enabler_disable(event_notifier_enabler);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_FILTER:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ return -EINVAL;
+ case LTTNG_TYPE_ENABLER:
+ event_notifier_enabler = file->private_data;
+ return lttng_event_notifier_enabler_attach_bytecode(event_notifier_enabler,
+ (struct lttng_kernel_filter_bytecode __user *) arg);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+static
+int lttng_event_notifier_release(struct inode *inode, struct file *file)
+{
+ struct lttng_event_notifier *event_notifier;
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+ enum lttng_event_type *evtype = file->private_data;
+
+ if (!evtype)
+ return 0;
+
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ event_notifier = file->private_data;
+ if (event_notifier)
+ fput(event_notifier->group->file);
+ break;
+ case LTTNG_TYPE_ENABLER:
+ event_notifier_enabler = file->private_data;
+ if (event_notifier_enabler)
+ fput(event_notifier_enabler->group->file);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ return 0;
+}
+
+static const struct file_operations lttng_event_notifier_fops = {
+ .owner = THIS_MODULE,
+ .release = lttng_event_notifier_release,
+ .unlocked_ioctl = lttng_event_notifier_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_event_notifier_ioctl,
+#endif
+};
+
+static
+int lttng_abi_create_event_notifier(struct file *event_notifier_group_file,
+ struct lttng_kernel_event_notifier *event_notifier_param)
+{
+ struct lttng_event_notifier_group *event_notifier_group =
+ event_notifier_group_file->private_data;
+ int event_notifier_fd, ret;
+ struct file *event_notifier_file;
+ void *priv;
+
+ switch (event_notifier_param->event.instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_UPROBE:
+ case LTTNG_KERNEL_KRETPROBE:
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_NOOP:
+ case LTTNG_KERNEL_SYSCALL:
+ default:
+ ret = -EINVAL;
+ goto inval_instr;
+ }
+
+ event_notifier_param->event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+
+ event_notifier_fd = lttng_get_unused_fd();
+ if (event_notifier_fd < 0) {
+ ret = event_notifier_fd;
+ goto fd_error;
+ }
+
+ event_notifier_file = anon_inode_getfile("[lttng_event_notifier]",
+ <tng_event_notifier_fops,
+ NULL, O_RDWR);
+ if (IS_ERR(event_notifier_file)) {
+ ret = PTR_ERR(event_notifier_file);
+ goto file_error;
+ }
+
+ /* The event notifier holds a reference on the event notifier group. */
+ if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
+
+ if (event_notifier_param->event.instrumentation == LTTNG_KERNEL_TRACEPOINT
+ || event_notifier_param->event.instrumentation == LTTNG_KERNEL_SYSCALL) {
+ struct lttng_event_notifier_enabler *enabler;
+
+ if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) {
+ /*
+ * If the event name is a star globbing pattern,
+ * we create the special star globbing enabler.
+ */
+ enabler = lttng_event_notifier_enabler_create(
+ event_notifier_group,
+ LTTNG_ENABLER_FORMAT_STAR_GLOB,
+ event_notifier_param);
+ } else {
+ enabler = lttng_event_notifier_enabler_create(
+ event_notifier_group,
+ LTTNG_ENABLER_FORMAT_NAME,
+ event_notifier_param);
+ }
+ priv = enabler;
+ } else {
+ struct lttng_event_notifier *event_notifier;
+
+ /*
+ * We tolerate no failure path after event notifier creation.
+ * It will stay invariant for the rest of the session.
+ */
+ event_notifier = lttng_event_notifier_create(NULL,
+ event_notifier_param->event.token, event_notifier_group,
+ event_notifier_param, NULL,
+ event_notifier_param->event.instrumentation);
+ WARN_ON_ONCE(!event_notifier);
+ if (IS_ERR(event_notifier)) {
+ ret = PTR_ERR(event_notifier);
+ goto event_notifier_error;
+ }
+ priv = event_notifier;
+ }
+ event_notifier_file->private_data = priv;
+ fd_install(event_notifier_fd, event_notifier_file);
+ return event_notifier_fd;
+
+event_notifier_error:
+ atomic_long_dec(&event_notifier_group_file->f_count);
+refcount_error:
+ fput(event_notifier_file);
+file_error:
+ put_unused_fd(event_notifier_fd);
+fd_error:
+inval_instr:
+ return ret;
+}
+
+static
+long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ switch (cmd) {
+ case LTTNG_KERNEL_EVENT_NOTIFIER_CREATE:
+ {
+ struct lttng_kernel_event_notifier uevent_notifier_param;
+
+ if (copy_from_user(&uevent_notifier_param,
+ (struct lttng_kernel_event_notifier __user *) arg,
+ sizeof(uevent_notifier_param)))
+ return -EFAULT;
+ return lttng_abi_create_event_notifier(file, &uevent_notifier_param);
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static
+int lttng_event_notifier_group_release(struct inode *inode, struct file *file)
+{
+ struct lttng_event_notifier_group *event_notifier_group =
+ file->private_data;
+
+ if (event_notifier_group)
+ lttng_event_notifier_group_destroy(event_notifier_group);
+ return 0;
+}
+
+static const struct file_operations lttng_event_notifier_group_fops = {
+ .owner = THIS_MODULE,
+ .release = lttng_event_notifier_group_release,
+ .unlocked_ioctl = lttng_event_notifier_group_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_event_notifier_group_ioctl,
+#endif
+};
+
/**
* lttng_channel_ioctl - lttng syscall through ioctl
*
long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct lttng_event *event;
- struct lttng_enabler *enabler;
+ struct lttng_event_enabler *event_enabler;
enum lttng_event_type *evtype = file->private_data;
switch (cmd) {
event = file->private_data;
return lttng_event_enable(event);
case LTTNG_TYPE_ENABLER:
- enabler = file->private_data;
- return lttng_enabler_enable(enabler);
+ event_enabler = file->private_data;
+ return lttng_event_enabler_enable(event_enabler);
default:
WARN_ON_ONCE(1);
return -ENOSYS;
event = file->private_data;
return lttng_event_disable(event);
case LTTNG_TYPE_ENABLER:
- enabler = file->private_data;
- return lttng_enabler_disable(enabler);
+ event_enabler = file->private_data;
+ return lttng_event_enabler_disable(event_enabler);
default:
WARN_ON_ONCE(1);
return -ENOSYS;
return -EINVAL;
case LTTNG_TYPE_ENABLER:
{
- enabler = file->private_data;
- return lttng_enabler_attach_bytecode(enabler,
+ event_enabler = file->private_data;
+ return lttng_event_enabler_attach_bytecode(event_enabler,
(struct lttng_kernel_filter_bytecode __user *) arg);
}
default:
int lttng_event_release(struct inode *inode, struct file *file)
{
struct lttng_event *event;
- struct lttng_enabler *enabler;
+ struct lttng_event_enabler *event_enabler;
enum lttng_event_type *evtype = file->private_data;
if (!evtype)
fput(event->chan->file);
break;
case LTTNG_TYPE_ENABLER:
- enabler = file->private_data;
- if (enabler)
- fput(enabler->chan->file);
+ event_enabler = file->private_data;
+ if (event_enabler)
+ fput(event_enabler->chan->file);
break;
default:
WARN_ON_ONCE(1);
projects / lttng-modules.git / blobdiff