-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
* lttng-abi.c
*
* LTTng ABI
*
* Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- *
* Mimic system calls for:
* - session creation, returns a file descriptor or failure.
* - channel creation, returns a file descriptor or failure.
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/err.h>
-#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
-#include "wrapper/ringbuffer/vfs.h"
-#include "wrapper/ringbuffer/backend.h"
-#include "wrapper/ringbuffer/frontend.h"
-#include "wrapper/poll.h"
-#include "lttng-abi.h"
-#include "lttng-abi-old.h"
-#include "lttng-events.h"
-#include "lttng-tracer.h"
-#include "lib/ringbuffer/frontend_types.h"
+#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
+#include <wrapper/ringbuffer/vfs.h>
+#include <wrapper/ringbuffer/backend.h>
+#include <wrapper/ringbuffer/frontend.h>
+#include <wrapper/poll.h>
+#include <wrapper/file.h>
+#include <wrapper/kref.h>
+#include <lttng-string-utils.h>
+#include <lttng-abi.h>
+#include <lttng-abi-old.h>
+#include <lttng-events.h>
+#include <lttng-tracer.h>
+#include <lttng-tp-mempool.h>
+#include <lib/ringbuffer/frontend_types.h>
+#include <lib/ringbuffer/iterator.h>
/*
* This is LTTng's own personal way to create a system call as an external
*/
static struct proc_dir_entry *lttng_proc_dentry;
-static const struct file_operations lttng_fops;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops lttng_proc_ops;
+#else
+static const struct file_operations lttng_proc_ops;
+#endif
+
static const struct file_operations lttng_session_fops;
+static const struct file_operations lttng_trigger_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;
static struct file_operations lttng_stream_ring_buffer_file_operations;
+static int put_u64(uint64_t val, unsigned long arg);
+
/*
* Teardown management: opened file descriptors keep a refcount on the module,
* so it can only exit when all file descriptors are closed.
session = lttng_session_create();
if (!session)
return -ENOMEM;
- session_fd = get_unused_fd();
+ session_fd = lttng_get_unused_fd();
if (session_fd < 0) {
ret = session_fd;
goto fd_error;
return ret;
}
+static
+void trigger_send_notification_work_wakeup(struct irq_work *entry)
+{
+ struct lttng_trigger_group *trigger_group = container_of(entry,
+ struct lttng_trigger_group, wakeup_pending);
+ wake_up_interruptible(&trigger_group->read_wait);
+}
+
+static
+int lttng_abi_create_trigger_group(void)
+{
+ struct lttng_trigger_group *trigger_group;
+ struct file *trigger_group_file;
+ int trigger_group_fd, ret;
+
+ trigger_group = lttng_trigger_group_create();
+ if (!trigger_group)
+ return -ENOMEM;
+
+ trigger_group_fd = lttng_get_unused_fd();
+ if (trigger_group_fd < 0) {
+ ret = trigger_group_fd;
+ goto fd_error;
+ }
+ trigger_group_file = anon_inode_getfile("[lttng_trigger_group]",
+ <tng_trigger_group_fops,
+ trigger_group, O_RDWR);
+ if (IS_ERR(trigger_group_file)) {
+ ret = PTR_ERR(trigger_group_file);
+ goto file_error;
+ }
+
+ trigger_group->file = trigger_group_file;
+ init_waitqueue_head(&trigger_group->read_wait);
+ init_irq_work(&trigger_group->wakeup_pending,
+ trigger_send_notification_work_wakeup);
+ fd_install(trigger_group_fd, trigger_group_file);
+ return trigger_group_fd;
+
+file_error:
+ put_unused_fd(trigger_group_fd);
+fd_error:
+ lttng_trigger_group_destroy(trigger_group);
+ return ret;
+}
+
static
int lttng_abi_tracepoint_list(void)
{
struct file *tracepoint_list_file;
int file_fd, ret;
- file_fd = get_unused_fd();
+ file_fd = lttng_get_unused_fd();
if (file_fd < 0) {
ret = file_fd;
goto fd_error;
}
- tracepoint_list_file = anon_inode_getfile("[lttng_session]",
+ tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]",
<tng_tracepoint_list_fops,
NULL, O_RDWR);
if (IS_ERR(tracepoint_list_file)) {
if (ret < 0)
goto open_error;
fd_install(file_fd, tracepoint_list_file);
+ return file_fd;
+
+open_error:
+ fput(tracepoint_list_file);
+file_error:
+ put_unused_fd(file_fd);
+fd_error:
+ return ret;
+}
+
+#ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS
+static inline
+int lttng_abi_syscall_list(void)
+{
+ return -ENOSYS;
+}
+#else
+static
+int lttng_abi_syscall_list(void)
+{
+ struct file *syscall_list_file;
+ int file_fd, ret;
+
+ file_fd = lttng_get_unused_fd();
if (file_fd < 0) {
ret = file_fd;
goto fd_error;
}
+
+ syscall_list_file = anon_inode_getfile("[lttng_syscall_list]",
+ <tng_syscall_list_fops,
+ NULL, O_RDWR);
+ if (IS_ERR(syscall_list_file)) {
+ ret = PTR_ERR(syscall_list_file);
+ goto file_error;
+ }
+ ret = lttng_syscall_list_fops.open(NULL, syscall_list_file);
+ if (ret < 0)
+ goto open_error;
+ fd_install(file_fd, syscall_list_file);
return file_fd;
open_error:
- fput(tracepoint_list_file);
+ fput(syscall_list_file);
file_error:
put_unused_fd(file_fd);
fd_error:
return ret;
}
+#endif
static
void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v)
v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION;
}
+static
+void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v)
+{
+ v->major = LTTNG_MODULES_ABI_MAJOR_VERSION;
+ v->minor = LTTNG_MODULES_ABI_MINOR_VERSION;
+}
+
static
long lttng_abi_add_context(struct file *file,
struct lttng_kernel_context *context_param,
return lttng_add_procname_to_ctx(ctx);
case LTTNG_KERNEL_CONTEXT_HOSTNAME:
return lttng_add_hostname_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_CPU_ID:
+ return lttng_add_cpu_id_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE:
+ return lttng_add_interruptible_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE:
+ return lttng_add_need_reschedule_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE:
+ return lttng_add_preemptible_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_MIGRATABLE:
+ return lttng_add_migratable_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL:
+ case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER:
+ return lttng_add_callstack_to_ctx(ctx, context_param->ctx);
+ case LTTNG_KERNEL_CONTEXT_CGROUP_NS:
+ return lttng_add_cgroup_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_IPC_NS:
+ return lttng_add_ipc_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_MNT_NS:
+ return lttng_add_mnt_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_NET_NS:
+ return lttng_add_net_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_PID_NS:
+ return lttng_add_pid_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_USER_NS:
+ return lttng_add_user_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_UTS_NS:
+ return lttng_add_uts_ns_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_UID:
+ return lttng_add_uid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_EUID:
+ return lttng_add_euid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_SUID:
+ return lttng_add_suid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_GID:
+ return lttng_add_gid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_EGID:
+ return lttng_add_egid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_SGID:
+ return lttng_add_sgid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VUID:
+ return lttng_add_vuid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VEUID:
+ return lttng_add_veuid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VSUID:
+ return lttng_add_vsuid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VGID:
+ return lttng_add_vgid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VEGID:
+ return lttng_add_vegid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_VSGID:
+ return lttng_add_vsgid_to_ctx(ctx);
default:
return -EINVAL;
}
* Returns a file descriptor listing available tracepoints
* LTTNG_KERNEL_WAIT_QUIESCENT
* Returns after all previously running probes have completed
+ * LTTNG_KERNEL_TRACER_ABI_VERSION
+ * Returns the LTTng kernel tracer ABI version
+ * LTTNG_KERNEL_TRIGGER_GROUP_CREATE
+ * Returns a LTTng trigger 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_TRIGGER_GROUP_CREATE:
+ return lttng_abi_create_trigger_group();
case LTTNG_KERNEL_OLD_TRACER_VERSION:
{
struct lttng_kernel_tracer_version v;
(struct lttng_kernel_tracer_version __user *) arg;
lttng_abi_tracer_version(&version);
-
+
+ if (copy_to_user(uversion, &version, sizeof(version)))
+ return -EFAULT;
+ return 0;
+ }
+ case LTTNG_KERNEL_TRACER_ABI_VERSION:
+ {
+ struct lttng_kernel_tracer_abi_version version;
+ struct lttng_kernel_tracer_abi_version *uversion =
+ (struct lttng_kernel_tracer_abi_version __user *) arg;
+
+ lttng_abi_tracer_abi_version(&version);
+
if (copy_to_user(uversion, &version, sizeof(version)))
return -EFAULT;
return 0;
case LTTNG_KERNEL_OLD_TRACEPOINT_LIST:
case LTTNG_KERNEL_TRACEPOINT_LIST:
return lttng_abi_tracepoint_list();
+ case LTTNG_KERNEL_SYSCALL_LIST:
+ return lttng_abi_syscall_list();
case LTTNG_KERNEL_OLD_WAIT_QUIESCENT:
case LTTNG_KERNEL_WAIT_QUIESCENT:
synchronize_trace();
}
}
-static const struct file_operations lttng_fops = {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops lttng_proc_ops = {
+ .proc_ioctl = lttng_ioctl,
+#ifdef CONFIG_COMPAT
+ .proc_compat_ioctl = lttng_ioctl,
+#endif /* CONFIG_COMPAT */
+};
+#else
+static const struct file_operations lttng_proc_ops = {
.owner = THIS_MODULE,
.unlocked_ioctl = lttng_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = lttng_ioctl,
-#endif
+#endif /* CONFIG_COMPAT */
};
+#endif
static
int lttng_abi_create_channel(struct file *session_file,
int chan_fd;
int ret = 0;
- chan_fd = get_unused_fd();
+ chan_fd = lttng_get_unused_fd();
if (chan_fd < 0) {
ret = chan_fd;
goto fd_error;
fops = <tng_metadata_fops;
break;
}
-
+
chan_file = anon_inode_getfile("[lttng_channel]",
fops,
NULL, O_RDWR);
transport_name = "<unknown>";
break;
}
+ if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
/*
* We tolerate no failure path after channel creation. It will stay
* invariant for the rest of the session.
chan->file = chan_file;
chan_file->private_data = chan;
fd_install(chan_fd, chan_file);
- atomic_long_inc(&session_file->f_count);
return chan_fd;
chan_error:
+ atomic_long_dec(&session_file->f_count);
+refcount_error:
fput(chan_file);
file_error:
put_unused_fd(chan_fd);
return ret;
}
+static
+int lttng_abi_session_set_name(struct lttng_session *session,
+ struct lttng_kernel_session_name *name)
+{
+ size_t len;
+
+ len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN);
+
+ if (len == LTTNG_KERNEL_SESSION_NAME_LEN) {
+ /* Name is too long/malformed */
+ return -EINVAL;
+ }
+
+ strcpy(session->name, name->name);
+ return 0;
+}
+
+static
+int lttng_abi_session_set_creation_time(struct lttng_session *session,
+ struct lttng_kernel_session_creation_time *time)
+{
+ size_t len;
+
+ len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN);
+
+ if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) {
+ /* Time is too long/malformed */
+ return -EINVAL;
+ }
+
+ strcpy(session->creation_time, time->iso8601);
+ return 0;
+}
+
+static
+enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker)
+{
+ switch (tracker->type) {
+ case LTTNG_KERNEL_TRACKER_PID:
+ return TRACKER_PID;
+ case LTTNG_KERNEL_TRACKER_VPID:
+ return TRACKER_VPID;
+ case LTTNG_KERNEL_TRACKER_UID:
+ return TRACKER_UID;
+ case LTTNG_KERNEL_TRACKER_VUID:
+ return TRACKER_VUID;
+ case LTTNG_KERNEL_TRACKER_GID:
+ return TRACKER_GID;
+ case LTTNG_KERNEL_TRACKER_VGID:
+ return TRACKER_VGID;
+ default:
+ return TRACKER_UNKNOWN;
+ }
+}
+
/**
* lttng_session_ioctl - lttng session fd ioctl
*
* Disables tracing for a session (strong disable)
* LTTNG_KERNEL_METADATA
* Returns a LTTng metadata file descriptor
+ * LTTNG_KERNEL_SESSION_TRACK_PID
+ * Add PID to session PID tracker
+ * LTTNG_KERNEL_SESSION_UNTRACK_PID
+ * Remove PID from session PID tracker
+ * LTTNG_KERNEL_SESSION_TRACK_ID
+ * Add ID to tracker
+ * LTTNG_KERNEL_SESSION_UNTRACK_ID
+ * Remove ID from tracker
*
* The returned channel will be deleted when its file descriptor is closed.
*/
long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct lttng_session *session = file->private_data;
+ struct lttng_kernel_channel chan_param;
+ struct lttng_kernel_old_channel old_chan_param;
switch (cmd) {
case LTTNG_KERNEL_OLD_CHANNEL:
{
- struct lttng_kernel_channel chan_param;
- struct lttng_kernel_old_channel old_chan_param;
-
if (copy_from_user(&old_chan_param,
(struct lttng_kernel_old_channel __user *) arg,
sizeof(struct lttng_kernel_old_channel)))
}
case LTTNG_KERNEL_CHANNEL:
{
- struct lttng_kernel_channel chan_param;
-
if (copy_from_user(&chan_param,
(struct lttng_kernel_channel __user *) arg,
sizeof(struct lttng_kernel_channel)))
return lttng_session_disable(session);
case LTTNG_KERNEL_OLD_METADATA:
{
- struct lttng_kernel_channel chan_param;
- struct lttng_kernel_old_channel old_chan_param;
-
if (copy_from_user(&old_chan_param,
(struct lttng_kernel_old_channel __user *) arg,
sizeof(struct lttng_kernel_old_channel)))
}
case LTTNG_KERNEL_METADATA:
{
- struct lttng_kernel_channel chan_param;
-
if (copy_from_user(&chan_param,
(struct lttng_kernel_channel __user *) arg,
sizeof(struct lttng_kernel_channel)))
return lttng_abi_create_channel(file, &chan_param,
METADATA_CHANNEL);
}
+ case LTTNG_KERNEL_SESSION_TRACK_PID:
+ return lttng_session_track_id(session, TRACKER_PID, (int) arg);
+ case LTTNG_KERNEL_SESSION_UNTRACK_PID:
+ return lttng_session_untrack_id(session, TRACKER_PID, (int) arg);
+ case LTTNG_KERNEL_SESSION_TRACK_ID:
+ {
+ struct lttng_kernel_tracker_args tracker;
+ enum tracker_type tracker_type;
+
+ if (copy_from_user(&tracker,
+ (struct lttng_kernel_tracker_args __user *) arg,
+ sizeof(struct lttng_kernel_tracker_args)))
+ return -EFAULT;
+ tracker_type = get_tracker_type(&tracker);
+ if (tracker_type == TRACKER_UNKNOWN)
+ return -EINVAL;
+ return lttng_session_track_id(session, tracker_type, tracker.id);
+ }
+ case LTTNG_KERNEL_SESSION_UNTRACK_ID:
+ {
+ struct lttng_kernel_tracker_args tracker;
+ enum tracker_type tracker_type;
+
+ if (copy_from_user(&tracker,
+ (struct lttng_kernel_tracker_args __user *) arg,
+ sizeof(struct lttng_kernel_tracker_args)))
+ return -EFAULT;
+ tracker_type = get_tracker_type(&tracker);
+ if (tracker_type == TRACKER_UNKNOWN)
+ return -EINVAL;
+ return lttng_session_untrack_id(session, tracker_type,
+ tracker.id);
+ }
+ case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS:
+ return lttng_session_list_tracker_ids(session, TRACKER_PID);
+ case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS:
+ {
+ struct lttng_kernel_tracker_args tracker;
+ enum tracker_type tracker_type;
+
+ if (copy_from_user(&tracker,
+ (struct lttng_kernel_tracker_args __user *) arg,
+ sizeof(struct lttng_kernel_tracker_args)))
+ return -EFAULT;
+ tracker_type = get_tracker_type(&tracker);
+ if (tracker_type == TRACKER_UNKNOWN)
+ return -EINVAL;
+ return lttng_session_list_tracker_ids(session, tracker_type);
+ }
+ case LTTNG_KERNEL_SESSION_METADATA_REGEN:
+ return lttng_session_metadata_regenerate(session);
+ case LTTNG_KERNEL_SESSION_STATEDUMP:
+ return lttng_session_statedump(session);
+ case LTTNG_KERNEL_SESSION_SET_NAME:
+ {
+ struct lttng_kernel_session_name name;
+
+ if (copy_from_user(&name,
+ (struct lttng_kernel_session_name __user *) arg,
+ sizeof(struct lttng_kernel_session_name)))
+ return -EFAULT;
+ return lttng_abi_session_set_name(session, &name);
+ }
+ case LTTNG_KERNEL_SESSION_SET_CREATION_TIME:
+ {
+ struct lttng_kernel_session_creation_time time;
+
+ if (copy_from_user(&time,
+ (struct lttng_kernel_session_creation_time __user *) arg,
+ sizeof(struct lttng_kernel_session_creation_time)))
+ return -EFAULT;
+ return lttng_abi_session_set_creation_time(session, &time);
+ }
default:
return -ENOIOCTLCMD;
}
#endif
};
+/*
+ * When encountering empty buffer, flush current sub-buffer if non-empty
+ * and retry (if new data available to read after flush).
+ */
+static
+ssize_t lttng_trigger_group_notif_read(struct file *filp, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct lttng_trigger_group *trigger_group = filp->private_data;
+ struct channel *chan = trigger_group->chan;
+ struct lib_ring_buffer *buf = trigger_group->buf;
+ ssize_t read_count = 0, len;
+ size_t read_offset;
+
+ might_sleep();
+ if (!lttng_access_ok(VERIFY_WRITE, user_buf, count))
+ return -EFAULT;
+
+ /* Finish copy of previous record */
+ if (*ppos != 0) {
+ if (read_count < count) {
+ len = chan->iter.len_left;
+ read_offset = *ppos;
+ goto skip_get_next;
+ }
+ }
+
+ while (read_count < count) {
+ size_t copy_len, space_left;
+
+ len = lib_ring_buffer_get_next_record(chan, buf);
+len_test:
+ if (len < 0) {
+ /*
+ * Check if buffer is finalized (end of file).
+ */
+ if (len == -ENODATA) {
+ /* A 0 read_count will tell about end of file */
+ goto nodata;
+ }
+ if (filp->f_flags & O_NONBLOCK) {
+ if (!read_count)
+ read_count = -EAGAIN;
+ goto nodata;
+ } else {
+ int error;
+
+ /*
+ * No data available at the moment, return what
+ * we got.
+ */
+ if (read_count)
+ goto nodata;
+
+ /*
+ * Wait for returned len to be >= 0 or -ENODATA.
+ */
+ error = wait_event_interruptible(
+ trigger_group->read_wait,
+ ((len = lib_ring_buffer_get_next_record(
+ chan, buf)), len != -EAGAIN));
+ CHAN_WARN_ON(chan, len == -EBUSY);
+ if (error) {
+ read_count = error;
+ goto nodata;
+ }
+ CHAN_WARN_ON(chan, len < 0 && len != -ENODATA);
+ goto len_test;
+ }
+ }
+ read_offset = buf->iter.read_offset;
+skip_get_next:
+ space_left = count - read_count;
+ if (len <= space_left) {
+ copy_len = len;
+ chan->iter.len_left = 0;
+ *ppos = 0;
+ } else {
+ copy_len = space_left;
+ chan->iter.len_left = len - copy_len;
+ *ppos = read_offset + copy_len;
+ }
+ if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset,
+ &user_buf[read_count],
+ copy_len)) {
+ /*
+ * Leave the len_left and ppos values at their current
+ * state, as we currently have a valid event to read.
+ */
+ return -EFAULT;
+ }
+ read_count += copy_len;
+ }
+ goto put_record;
+
+nodata:
+ *ppos = 0;
+ chan->iter.len_left = 0;
+
+put_record:
+ lib_ring_buffer_put_current_record(buf);
+ return read_count;
+}
+
+/*
+ * If the ring buffer is non empty (even just a partial subbuffer), return that
+ * there is data available. Perform a ring buffer flush if we encounter a
+ * non-empty ring buffer which does not have any consumeable subbuffer available.
+ */
+static
+unsigned int lttng_trigger_group_notif_poll(struct file *filp,
+ poll_table *wait)
+{
+ unsigned int mask = 0;
+ struct lttng_trigger_group *trigger_group = filp->private_data;
+ struct channel *chan = trigger_group->chan;
+ struct lib_ring_buffer *buf = trigger_group->buf;
+ const struct lib_ring_buffer_config *config = &chan->backend.config;
+ int finalized, disabled;
+ unsigned long consumed, offset;
+ size_t subbuffer_header_size = config->cb.subbuffer_header_size();
+
+ if (filp->f_mode & FMODE_READ) {
+ poll_wait_set_exclusive(wait);
+ poll_wait(filp, &trigger_group->read_wait, wait);
+
+ finalized = lib_ring_buffer_is_finalized(config, buf);
+ disabled = lib_ring_buffer_channel_is_disabled(chan);
+
+ /*
+ * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering
+ * finalized load before offsets loads.
+ */
+ WARN_ON(atomic_long_read(&buf->active_readers) != 1);
+retry:
+ if (disabled)
+ return POLLERR;
+
+ offset = lib_ring_buffer_get_offset(config, buf);
+ consumed = lib_ring_buffer_get_consumed(config, buf);
+
+ /*
+ * If there is no buffer available to consume.
+ */
+ if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) {
+ /*
+ * If there is a non-empty subbuffer, flush and try again.
+ */
+ if (subbuf_offset(offset, chan) > subbuffer_header_size) {
+ lib_ring_buffer_switch_remote(buf);
+ goto retry;
+ }
+
+ if (finalized)
+ return POLLHUP;
+ else {
+ /*
+ * The memory barriers
+ * __wait_event()/wake_up_interruptible() take
+ * care of "raw_spin_is_locked" memory ordering.
+ */
+ if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock))
+ goto retry;
+ else
+ return 0;
+ }
+ } else {
+ if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan)
+ >= chan->backend.buf_size)
+ return POLLPRI | POLLRDBAND;
+ else
+ return POLLIN | POLLRDNORM;
+ }
+ }
+
+ return mask;
+}
+
+/**
+ * lttng_trigger_group_notif_open - trigger ring buffer open file operation
+ * @inode: opened inode
+ * @file: opened file
+ *
+ * Open implementation. Makes sure only one open instance of a buffer is
+ * done at a given moment.
+ */
+static int lttng_trigger_group_notif_open(struct inode *inode, struct file *file)
+{
+ struct lttng_trigger_group *trigger_group = inode->i_private;
+ struct lib_ring_buffer *buf = trigger_group->buf;
+
+ file->private_data = trigger_group;
+ return lib_ring_buffer_open(inode, file, buf);
+}
+
+/**
+ * lttng_trigger_group_notif_release - trigger ring buffer release file operation
+ * @inode: opened inode
+ * @file: opened file
+ *
+ * Release implementation.
+ */
+static int lttng_trigger_group_notif_release(struct inode *inode, struct file *file)
+{
+ struct lttng_trigger_group *trigger_group = file->private_data;
+ struct lib_ring_buffer *buf = trigger_group->buf;
+ int ret;
+
+ ret = lib_ring_buffer_release(inode, file, buf);
+ if (ret)
+ return ret;
+ fput(trigger_group->file);
+ return 0;
+}
+
+static const struct file_operations lttng_trigger_group_notif_fops = {
+ .owner = THIS_MODULE,
+ .open = lttng_trigger_group_notif_open,
+ .release = lttng_trigger_group_notif_release,
+ .read = lttng_trigger_group_notif_read,
+ .poll = lttng_trigger_group_notif_poll,
+};
+
/**
* lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
* @filp: the file
if (finalized)
mask |= POLLHUP;
+ mutex_lock(&stream->metadata_cache->lock);
if (stream->metadata_cache->metadata_written >
stream->metadata_out)
mask |= POLLIN;
+ mutex_unlock(&stream->metadata_cache->lock);
}
return mask;
stream->metadata_out = stream->metadata_in;
}
+/*
+ * Reset the counter of how much metadata has been consumed to 0. That way,
+ * the consumer receives the content of the metadata cache unchanged. This is
+ * different from the metadata_regenerate where the offset from epoch is
+ * resampled, here we want the exact same content as the last time the metadata
+ * was generated. This command is only possible if all the metadata written
+ * in the cache has been output to the metadata stream to avoid corrupting the
+ * metadata file.
+ *
+ * Return 0 on success, a negative value on error.
+ */
+static
+int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream)
+{
+ int ret;
+ struct lttng_metadata_cache *cache = stream->metadata_cache;
+
+ mutex_lock(&cache->lock);
+ if (stream->metadata_out != cache->metadata_written) {
+ ret = -EBUSY;
+ goto end;
+ }
+ stream->metadata_out = 0;
+ stream->metadata_in = 0;
+ wake_up_interruptible(&stream->read_wait);
+ ret = 0;
+
+end:
+ mutex_unlock(&cache->lock);
+ return ret;
+}
+
static
long lttng_metadata_ring_buffer_ioctl(struct file *filp,
unsigned int cmd, unsigned long arg)
*/
return -ENOSYS;
}
+ case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */
case RING_BUFFER_FLUSH:
{
struct lttng_metadata_stream *stream = filp->private_data;
goto err;
break;
}
+ case RING_BUFFER_GET_METADATA_VERSION:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return put_u64(stream->version, arg);
+ }
+ case RING_BUFFER_METADATA_CACHE_DUMP:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return lttng_metadata_cache_dump(stream);
+ }
default:
break;
}
*/
return -ENOSYS;
}
+ case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */
+ case RING_BUFFER_FLUSH:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lib_ring_buffer *buf = stream->priv;
+ struct channel *chan = buf->backend.chan;
+
+ /*
+ * Before doing the actual ring buffer flush, write up to one
+ * packet of metadata in the ring buffer.
+ */
+ ret = lttng_metadata_output_channel(stream, chan);
+ if (ret < 0)
+ goto err;
+ break;
+ }
+ case RING_BUFFER_GET_METADATA_VERSION:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return put_u64(stream->version, arg);
+ }
+ case RING_BUFFER_METADATA_CACHE_DUMP:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return lttng_metadata_cache_dump(stream);
+ }
default:
break;
}
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;
- stream_fd = get_unused_fd();
+ stream_fd = lttng_get_unused_fd();
if (stream_fd < 0) {
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;
goto notransport;
}
+ if (!lttng_kref_get(&session->metadata_cache->refcount)) {
+ ret = -EOVERFLOW;
+ goto kref_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;
- kref_get(&session->metadata_cache->refcount);
list_add(&metadata_stream->list,
&session->metadata_cache->metadata_stream);
return ret;
fd_error:
+ kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
+kref_error:
module_put(metadata_stream->transport->owner);
notransport:
kfree(metadata_stream);
return ret;
}
+static
+int lttng_abi_open_trigger_group_stream(struct file *notif_file)
+{
+ struct lttng_trigger_group *trigger_group = notif_file->private_data;
+ struct channel *chan = trigger_group->chan;
+ struct lib_ring_buffer *buf;
+ int ret;
+ void *stream_priv;
+
+ buf = trigger_group->ops->buffer_read_open(chan);
+ if (!buf)
+ return -ENOENT;
+
+ /* The trigger notification fd holds a reference on the trigger group */
+ if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
+ trigger_group->buf = buf;
+ stream_priv = trigger_group;
+ ret = lttng_abi_create_stream_fd(notif_file, stream_priv,
+ <tng_trigger_group_notif_fops,
+ "[lttng_trigger_stream]");
+ if (ret < 0)
+ goto fd_error;
+
+ return ret;
+
+fd_error:
+ atomic_long_dec(¬if_file->f_count);
+refcount_error:
+ trigger_group->ops->buffer_read_close(buf);
+ return ret;
+}
+
static
int lttng_abi_create_event(struct file *channel_file,
struct lttng_kernel_event *event_param)
{
struct lttng_channel *channel = channel_file->private_data;
- struct lttng_event *event;
int event_fd, ret;
struct file *event_file;
+ void *priv;
event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
switch (event_param->instrumentation) {
default:
break;
}
- switch (event_param->instrumentation) {
- default:
- event_fd = get_unused_fd();
- if (event_fd < 0) {
- ret = event_fd;
- goto fd_error;
- }
- event_file = anon_inode_getfile("[lttng_event]",
- <tng_event_fops,
- NULL, O_RDWR);
- if (IS_ERR(event_file)) {
- ret = PTR_ERR(event_file);
- goto file_error;
+ event_fd = lttng_get_unused_fd();
+ if (event_fd < 0) {
+ ret = event_fd;
+ goto fd_error;
+ }
+ event_file = anon_inode_getfile("[lttng_event]",
+ <tng_event_fops,
+ NULL, O_RDWR);
+ if (IS_ERR(event_file)) {
+ ret = PTR_ERR(event_file);
+ goto file_error;
+ }
+ /* The event holds a reference on the channel */
+ if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
+ if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT
+ || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) {
+ 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.
+ */
+ event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB,
+ event_param, channel);
+ } else {
+ event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
+ event_param, channel);
}
+ priv = event_enabler;
+ } else {
+ struct lttng_event *event;
+
/*
* We tolerate no failure path after event creation. It
* will stay invariant for the rest of the session.
*/
- event = lttng_event_create(channel, event_param, NULL, NULL);
+ event = lttng_event_create(channel, event_param,
+ NULL, NULL,
+ event_param->instrumentation);
WARN_ON_ONCE(!event);
if (IS_ERR(event)) {
ret = PTR_ERR(event);
goto event_error;
}
- event_file->private_data = event;
- fd_install(event_fd, event_file);
- /* The event holds a reference on the channel */
- atomic_long_inc(&channel_file->f_count);
- break;
- case LTTNG_KERNEL_SYSCALL:
- /*
- * Only all-syscall tracing supported for now.
- */
- if (event_param->name[0] != '\0')
- return -EINVAL;
- ret = lttng_syscalls_register(channel, NULL);
- if (ret)
- goto fd_error;
- event_fd = 0;
- break;
+ priv = event;
}
+ event_file->private_data = priv;
+ fd_install(event_fd, event_file);
return event_fd;
event_error:
+ atomic_long_dec(&channel_file->f_count);
+refcount_error:
fput(event_file);
file_error:
put_unused_fd(event_fd);
return ret;
}
+static
+long lttng_trigger_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct lttng_trigger *trigger;
+ struct lttng_trigger_enabler *trigger_enabler;
+ enum lttng_event_type *evtype = file->private_data;
+
+ switch (cmd) {
+ case LTTNG_KERNEL_ENABLE:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ trigger = file->private_data;
+ return lttng_trigger_enable(trigger);
+ case LTTNG_TYPE_ENABLER:
+ trigger_enabler = file->private_data;
+ return lttng_trigger_enabler_enable(trigger_enabler);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_DISABLE:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ trigger = file->private_data;
+ return lttng_trigger_disable(trigger);
+ case LTTNG_TYPE_ENABLER:
+ trigger_enabler = file->private_data;
+ return lttng_trigger_enabler_disable(trigger_enabler);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_FILTER:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ return -EINVAL;
+ case LTTNG_TYPE_ENABLER:
+ trigger_enabler = file->private_data;
+ return lttng_trigger_enabler_attach_bytecode(trigger_enabler,
+ (struct lttng_kernel_filter_bytecode __user *) arg);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_ADD_CALLSITE:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ trigger = file->private_data;
+ return lttng_trigger_add_callsite(trigger,
+ (struct lttng_kernel_event_callsite __user *) arg);
+ case LTTNG_TYPE_ENABLER:
+ return -EINVAL;
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+static
+int lttng_trigger_release(struct inode *inode, struct file *file)
+{
+ struct lttng_trigger *trigger;
+ struct lttng_trigger_enabler *trigger_enabler;
+ enum lttng_event_type *evtype = file->private_data;
+
+ if (!evtype)
+ return 0;
+
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ trigger = file->private_data;
+ if (trigger)
+ fput(trigger->group->file);
+ break;
+ case LTTNG_TYPE_ENABLER:
+ trigger_enabler = file->private_data;
+ if (trigger_enabler)
+ fput(trigger_enabler->group->file);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ return 0;
+}
+
+static const struct file_operations lttng_trigger_fops = {
+ .owner = THIS_MODULE,
+ .release = lttng_trigger_release,
+ .unlocked_ioctl = lttng_trigger_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_trigger_ioctl,
+#endif
+};
+
+static
+int lttng_abi_create_trigger(struct file *trigger_group_file,
+ struct lttng_kernel_trigger *trigger_param)
+{
+ struct lttng_trigger_group *trigger_group = trigger_group_file->private_data;
+ int trigger_fd, ret;
+ struct file *trigger_file;
+ void *priv;
+
+ switch (trigger_param->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_KERNEL_UPROBE:
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ trigger_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ break;
+ case LTTNG_KERNEL_SYSCALL:
+ break;
+ case LTTNG_KERNEL_KRETPROBE:
+ /* Placing a trigger on kretprobe is not supported. */
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_NOOP:
+ default:
+ ret = -EINVAL;
+ goto inval_instr;
+ }
+
+ trigger_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+
+ trigger_fd = lttng_get_unused_fd();
+ if (trigger_fd < 0) {
+ ret = trigger_fd;
+ goto fd_error;
+ }
+
+ trigger_file = anon_inode_getfile("[lttng_trigger]",
+ <tng_trigger_fops,
+ NULL, O_RDWR);
+ if (IS_ERR(trigger_file)) {
+ ret = PTR_ERR(trigger_file);
+ goto file_error;
+ }
+
+ /* The trigger holds a reference on the trigger group. */
+ if (!atomic_long_add_unless(&trigger_group_file->f_count, 1, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
+
+ if (trigger_param->instrumentation == LTTNG_KERNEL_TRACEPOINT
+ || trigger_param->instrumentation == LTTNG_KERNEL_SYSCALL) {
+ struct lttng_trigger_enabler *enabler;
+
+ if (strutils_is_star_glob_pattern(trigger_param->name)) {
+ /*
+ * If the event name is a star globbing pattern,
+ * we create the special star globbing enabler.
+ */
+ enabler = lttng_trigger_enabler_create(trigger_group,
+ LTTNG_ENABLER_FORMAT_STAR_GLOB, trigger_param);
+ } else {
+ enabler = lttng_trigger_enabler_create(trigger_group,
+ LTTNG_ENABLER_FORMAT_NAME, trigger_param);
+ }
+ priv = enabler;
+ } else {
+ struct lttng_trigger *trigger;
+
+ /*
+ * We tolerate no failure path after trigger creation. It
+ * will stay invariant for the rest of the session.
+ */
+ trigger = lttng_trigger_create(NULL, trigger_param->id,
+ trigger_group, trigger_param, NULL,
+ trigger_param->instrumentation);
+ WARN_ON_ONCE(!trigger);
+ if (IS_ERR(trigger)) {
+ ret = PTR_ERR(trigger);
+ goto trigger_error;
+ }
+ priv = trigger;
+ }
+ trigger_file->private_data = priv;
+ fd_install(trigger_fd, trigger_file);
+ return trigger_fd;
+
+trigger_error:
+ atomic_long_dec(&trigger_group_file->f_count);
+refcount_error:
+ fput(trigger_file);
+file_error:
+ put_unused_fd(trigger_fd);
+fd_error:
+inval_instr:
+ return ret;
+}
+
+static
+long lttng_trigger_group_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case LTTNG_KERNEL_TRIGGER_GROUP_NOTIFICATION_FD:
+ {
+ return lttng_abi_open_trigger_group_stream(file);
+ }
+ case LTTNG_KERNEL_TRIGGER_CREATE:
+ {
+ struct lttng_kernel_trigger utrigger_param;
+
+ if (copy_from_user(&utrigger_param,
+ (struct lttng_kernel_trigger __user *) arg,
+ sizeof(utrigger_param)))
+ return -EFAULT;
+ return lttng_abi_create_trigger(file, &utrigger_param);
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static
+int lttng_trigger_group_release(struct inode *inode, struct file *file)
+{
+ struct lttng_trigger_group *trigger_group = file->private_data;
+
+ if (trigger_group)
+ lttng_trigger_group_destroy(trigger_group);
+ return 0;
+}
+
+static const struct file_operations lttng_trigger_group_fops = {
+ .owner = THIS_MODULE,
+ .release = lttng_trigger_group_release,
+ .unlocked_ioctl = lttng_trigger_group_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_trigger_group_ioctl,
+#endif
+};
+
/**
* lttng_channel_ioctl - lttng syscall through ioctl
*
case LTTNG_KERNEL_OLD_DISABLE:
case LTTNG_KERNEL_DISABLE:
return lttng_channel_disable(channel);
+ case LTTNG_KERNEL_SYSCALL_MASK:
+ return lttng_channel_syscall_mask(channel,
+ (struct lttng_kernel_syscall_mask __user *) arg);
default:
return -ENOIOCTLCMD;
}
-
}
/**
struct lttng_channel *channel = file->private_data;
if (channel) {
- lttng_metadata_channel_destroy(channel);
fput(channel->session->file);
+ lttng_metadata_channel_destroy(channel);
}
return 0;
static
long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- struct lttng_event *event = file->private_data;
+ struct lttng_event *event;
+ struct lttng_event_enabler *event_enabler;
+ enum lttng_event_type *evtype = file->private_data;
switch (cmd) {
case LTTNG_KERNEL_OLD_CONTEXT:
{
- struct lttng_kernel_context *ucontext_param;
- struct lttng_kernel_old_context *old_ucontext_param;
- int ret;
-
- ucontext_param = kmalloc(sizeof(struct lttng_kernel_context),
- GFP_KERNEL);
- if (!ucontext_param) {
- ret = -ENOMEM;
- goto old_ctx_end;
- }
- old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context),
- GFP_KERNEL);
- if (!old_ucontext_param) {
- ret = -ENOMEM;
- goto old_ctx_error_free_param;
- }
-
- if (copy_from_user(old_ucontext_param,
- (struct lttng_kernel_old_context __user *) arg,
- sizeof(struct lttng_kernel_old_context))) {
- ret = -EFAULT;
- goto old_ctx_error_free_old_param;
- }
- ucontext_param->ctx = old_ucontext_param->ctx;
- memcpy(ucontext_param->padding, old_ucontext_param->padding,
- sizeof(ucontext_param->padding));
- /* only type that uses the union */
- if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) {
- ucontext_param->u.perf_counter.type =
- old_ucontext_param->u.perf_counter.type;
- ucontext_param->u.perf_counter.config =
- old_ucontext_param->u.perf_counter.config;
- memcpy(ucontext_param->u.perf_counter.name,
- old_ucontext_param->u.perf_counter.name,
- sizeof(ucontext_param->u.perf_counter.name));
- }
-
- ret = lttng_abi_add_context(file,
- ucontext_param,
- &event->ctx, event->chan->session);
-
-old_ctx_error_free_old_param:
- kfree(old_ucontext_param);
-old_ctx_error_free_param:
- kfree(ucontext_param);
-old_ctx_end:
- return ret;
+ /* Not implemented */
+ return -ENOSYS;
}
case LTTNG_KERNEL_CONTEXT:
{
- struct lttng_kernel_context ucontext_param;
-
- if (copy_from_user(&ucontext_param,
- (struct lttng_kernel_context __user *) arg,
- sizeof(ucontext_param)))
- return -EFAULT;
- return lttng_abi_add_context(file,
- &ucontext_param,
- &event->ctx, event->chan->session);
+ /* Not implemented */
+ return -ENOSYS;
}
case LTTNG_KERNEL_OLD_ENABLE:
case LTTNG_KERNEL_ENABLE:
- return lttng_event_enable(event);
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ event = file->private_data;
+ return lttng_event_enable(event);
+ case LTTNG_TYPE_ENABLER:
+ event_enabler = file->private_data;
+ return lttng_event_enabler_enable(event_enabler);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
case LTTNG_KERNEL_OLD_DISABLE:
case LTTNG_KERNEL_DISABLE:
- return lttng_event_disable(event);
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ event = file->private_data;
+ return lttng_event_disable(event);
+ case LTTNG_TYPE_ENABLER:
+ event_enabler = file->private_data;
+ return lttng_event_enabler_disable(event_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_enabler = file->private_data;
+ return lttng_event_enabler_attach_bytecode(event_enabler,
+ (struct lttng_kernel_filter_bytecode __user *) arg);
+ }
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_ADD_CALLSITE:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ event = file->private_data;
+ return lttng_event_add_callsite(event,
+ (struct lttng_kernel_event_callsite __user *) arg);
+ case LTTNG_TYPE_ENABLER:
+ return -EINVAL;
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
default:
return -ENOIOCTLCMD;
}
static
int lttng_event_release(struct inode *inode, struct file *file)
{
- struct lttng_event *event = file->private_data;
+ struct lttng_event *event;
+ struct lttng_event_enabler *event_enabler;
+ enum lttng_event_type *evtype = file->private_data;
+
+ if (!evtype)
+ return 0;
+
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ event = file->private_data;
+ if (event)
+ fput(event->chan->file);
+ break;
+ case LTTNG_TYPE_ENABLER:
+ event_enabler = file->private_data;
+ if (event_enabler)
+ fput(event_enabler->chan->file);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
- if (event)
- fput(event->chan->file);
return 0;
}
goto error;
return put_u64(ts, arg);
}
+ case LTTNG_RING_BUFFER_GET_SEQ_NUM:
+ {
+ uint64_t seq;
+
+ ret = ops->sequence_number(config, buf, &seq);
+ if (ret < 0)
+ goto error;
+ return put_u64(seq, arg);
+ }
+ case LTTNG_RING_BUFFER_INSTANCE_ID:
+ {
+ uint64_t id;
+
+ ret = ops->instance_id(config, buf, &id);
+ if (ret < 0)
+ goto error;
+ return put_u64(id, arg);
+ }
default:
return lib_ring_buffer_file_operations.unlocked_ioctl(filp,
cmd, arg);
goto error;
return put_u64(ts, arg);
}
+ case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM:
+ {
+ uint64_t seq;
+
+ ret = ops->sequence_number(config, buf, &seq);
+ if (ret < 0)
+ goto error;
+ return put_u64(seq, arg);
+ }
+ case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID:
+ {
+ uint64_t id;
+
+ ret = ops->instance_id(config, buf, &id);
+ if (ret < 0)
+ goto error;
+ return put_u64(id, arg);
+ }
default:
return lib_ring_buffer_file_operations.compat_ioctl(filp,
cmd, arg);
int ret = 0;
wrapper_vmalloc_sync_all();
+ lttng_clock_ref();
+
+ ret = lttng_tp_mempool_init();
+ if (ret) {
+ goto error;
+ }
+
lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL,
- <tng_fops, NULL);
-
+ <tng_proc_ops, NULL);
+
if (!lttng_proc_dentry) {
printk(KERN_ERR "Error creating LTTng control file\n");
ret = -ENOMEM;
goto error;
}
lttng_stream_override_ring_buffer_fops();
+ return 0;
error:
+ lttng_tp_mempool_destroy();
+ lttng_clock_unref();
return ret;
}
-void __exit lttng_abi_exit(void)
+/* No __exit annotation because used by init error path too. */
+void lttng_abi_exit(void)
{
+ lttng_tp_mempool_destroy();
+ lttng_clock_unref();
if (lttng_proc_dentry)
remove_proc_entry("lttng", NULL);
}
projects / deliverable / lttng-modules.git / blobdiff