-/*
+/* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only)
+ *
* ring_buffer_iterator.c
*
* Ring buffer and channel iterators. Get each event of a channel in order. Uses
* complexity for the "get next event" operation.
*
* 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
- *
- * Author:
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
-#include <wrapper/ringbuffer/iterator.h>
-#include <wrapper/file.h>
+#include <include/ringbuffer/iterator.h>
+#include <linux/file.h>
+#include <linux/uaccess.h>
#include <linux/jiffies.h>
#include <linux/delay.h>
#include <linux/module.h>
list_add(&buf->iter.empty_node, &chan->iter.empty_head);
}
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
-
int lttng_cpuhp_rb_iter_online(unsigned int cpu,
struct lttng_cpuhp_node *node)
{
}
EXPORT_SYMBOL_GPL(lttng_cpuhp_rb_iter_online);
-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
-
-#ifdef CONFIG_HOTPLUG_CPU
-static
-int channel_iterator_cpu_hotplug(struct notifier_block *nb,
- unsigned long action,
- void *hcpu)
-{
- unsigned int cpu = (unsigned long)hcpu;
- struct channel *chan = container_of(nb, struct channel,
- hp_iter_notifier);
- struct lib_ring_buffer *buf = per_cpu_ptr(chan->backend.buf, cpu);
- const struct lib_ring_buffer_config *config = &chan->backend.config;
-
- if (!chan->hp_iter_enable)
- return NOTIFY_DONE;
-
- CHAN_WARN_ON(chan, config->alloc == RING_BUFFER_ALLOC_GLOBAL);
-
- switch (action) {
- case CPU_DOWN_FAILED:
- case CPU_DOWN_FAILED_FROZEN:
- case CPU_ONLINE:
- case CPU_ONLINE_FROZEN:
- lib_ring_buffer_iterator_init(chan, buf);
- return NOTIFY_OK;
- default:
- return NOTIFY_DONE;
- }
-}
-#endif
-
-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
-
int channel_iterator_init(struct channel *chan)
{
const struct lib_ring_buffer_config *config = &chan->backend.config;
if (ret)
return ret;
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
chan->cpuhp_iter_online.component = LTTNG_RING_BUFFER_ITER;
ret = cpuhp_state_add_instance(lttng_rb_hp_online,
&chan->cpuhp_iter_online.node);
if (ret)
return ret;
-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
- {
- int cpu;
-
- /*
- * In case of non-hotplug cpu, if the ring-buffer is allocated
- * in early initcall, it will not be notified of secondary cpus.
- * In that off case, we need to allocate for all possible cpus.
- */
-#ifdef CONFIG_HOTPLUG_CPU
- chan->hp_iter_notifier.notifier_call =
- channel_iterator_cpu_hotplug;
- chan->hp_iter_notifier.priority = 10;
- register_cpu_notifier(&chan->hp_iter_notifier);
-
- get_online_cpus();
- for_each_online_cpu(cpu) {
- buf = per_cpu_ptr(chan->backend.buf, cpu);
- lib_ring_buffer_iterator_init(chan, buf);
- }
- chan->hp_iter_enable = 1;
- put_online_cpus();
-#else
- for_each_possible_cpu(cpu) {
- buf = per_cpu_ptr(chan->backend.buf, cpu);
- lib_ring_buffer_iterator_init(chan, buf);
- }
-#endif
- }
-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
} else {
buf = channel_get_ring_buffer(config, chan, 0);
lib_ring_buffer_iterator_init(chan, buf);
const struct lib_ring_buffer_config *config = &chan->backend.config;
if (config->alloc == RING_BUFFER_ALLOC_PER_CPU) {
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
{
int ret;
&chan->cpuhp_iter_online.node);
WARN_ON(ret);
}
-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
- chan->hp_iter_enable = 0;
- unregister_cpu_notifier(&chan->hp_iter_notifier);
-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
}
}
ssize_t len;
might_sleep();
- if (!access_ok(VERIFY_WRITE, user_buf, count))
+ if (!access_ok(user_buf, count))
return -EFAULT;
/* Finish copy of previous record */
size_t count,
loff_t *ppos)
{
- struct inode *inode = filp->lttng_f_dentry->d_inode;
+ struct inode *inode = filp->f_path.dentry->d_inode;
struct lib_ring_buffer *buf = inode->i_private;
struct channel *chan = buf->backend.chan;
size_t count,
loff_t *ppos)
{
- struct inode *inode = filp->lttng_f_dentry->d_inode;
+ struct inode *inode = filp->f_path.dentry->d_inode;
struct channel *chan = inode->i_private;
const struct lib_ring_buffer_config *config = &chan->backend.config;