Commit 15075cac authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt

tracing: Separate open function from set_event and available_events

The open function used by available_events is the same as set_event even
though it uses different seq functions. This causes a side effect of
writing into available_events clearing all events, even though
available_events is suppose to be read only.

There's no reason to keep a single function for just the open and have
both use different functions for everything else. It is a little
confusing and causes strange behavior. Just have each have their own
function.
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 50ecf2c3
...@@ -491,19 +491,6 @@ static void t_stop(struct seq_file *m, void *p) ...@@ -491,19 +491,6 @@ static void t_stop(struct seq_file *m, void *p)
mutex_unlock(&event_mutex); mutex_unlock(&event_mutex);
} }
static int
ftrace_event_seq_open(struct inode *inode, struct file *file)
{
const struct seq_operations *seq_ops;
if ((file->f_mode & FMODE_WRITE) &&
(file->f_flags & O_TRUNC))
ftrace_clear_events();
seq_ops = inode->i_private;
return seq_open(file, seq_ops);
}
static ssize_t static ssize_t
event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
loff_t *ppos) loff_t *ppos)
...@@ -980,6 +967,9 @@ show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) ...@@ -980,6 +967,9 @@ show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
return r; return r;
} }
static int ftrace_event_avail_open(struct inode *inode, struct file *file);
static int ftrace_event_set_open(struct inode *inode, struct file *file);
static const struct seq_operations show_event_seq_ops = { static const struct seq_operations show_event_seq_ops = {
.start = t_start, .start = t_start,
.next = t_next, .next = t_next,
...@@ -995,14 +985,14 @@ static const struct seq_operations show_set_event_seq_ops = { ...@@ -995,14 +985,14 @@ static const struct seq_operations show_set_event_seq_ops = {
}; };
static const struct file_operations ftrace_avail_fops = { static const struct file_operations ftrace_avail_fops = {
.open = ftrace_event_seq_open, .open = ftrace_event_avail_open,
.read = seq_read, .read = seq_read,
.llseek = seq_lseek, .llseek = seq_lseek,
.release = seq_release, .release = seq_release,
}; };
static const struct file_operations ftrace_set_event_fops = { static const struct file_operations ftrace_set_event_fops = {
.open = ftrace_event_seq_open, .open = ftrace_event_set_open,
.read = seq_read, .read = seq_read,
.write = ftrace_event_write, .write = ftrace_event_write,
.llseek = seq_lseek, .llseek = seq_lseek,
...@@ -1078,6 +1068,26 @@ static struct dentry *event_trace_events_dir(void) ...@@ -1078,6 +1068,26 @@ static struct dentry *event_trace_events_dir(void)
return d_events; return d_events;
} }
static int
ftrace_event_avail_open(struct inode *inode, struct file *file)
{
const struct seq_operations *seq_ops = &show_event_seq_ops;
return seq_open(file, seq_ops);
}
static int
ftrace_event_set_open(struct inode *inode, struct file *file)
{
const struct seq_operations *seq_ops = &show_set_event_seq_ops;
if ((file->f_mode & FMODE_WRITE) &&
(file->f_flags & O_TRUNC))
ftrace_clear_events();
return seq_open(file, seq_ops);
}
static struct dentry * static struct dentry *
event_subsystem_dir(const char *name, struct dentry *d_events) event_subsystem_dir(const char *name, struct dentry *d_events)
{ {
...@@ -1508,15 +1518,13 @@ static __init int event_trace_init(void) ...@@ -1508,15 +1518,13 @@ static __init int event_trace_init(void)
return 0; return 0;
entry = debugfs_create_file("available_events", 0444, d_tracer, entry = debugfs_create_file("available_events", 0444, d_tracer,
(void *)&show_event_seq_ops, NULL, &ftrace_avail_fops);
&ftrace_avail_fops);
if (!entry) if (!entry)
pr_warning("Could not create debugfs " pr_warning("Could not create debugfs "
"'available_events' entry\n"); "'available_events' entry\n");
entry = debugfs_create_file("set_event", 0644, d_tracer, entry = debugfs_create_file("set_event", 0644, d_tracer,
(void *)&show_set_event_seq_ops, NULL, &ftrace_set_event_fops);
&ftrace_set_event_fops);
if (!entry) if (!entry)
pr_warning("Could not create debugfs " pr_warning("Could not create debugfs "
"'set_event' entry\n"); "'set_event' entry\n");
......
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