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ftrace: use seq_read

Browse source 
Impact: cleanup

VFS layer has tested the file mode, we do not need test it.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <srostedt@redhat.com>
LKML-Reference: <49BA2BAB.6010608@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Lai Jiangshan 2009-03-13 17:47:23 +08:00 committed by Ingo Molnar
parent fa9d13cf13
commit 850a80cfaa
1 changed files with 3 additions and 23 deletions
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26
kernel/trace/ftrace.c
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@ -1120,16 +1120,6 @@ ftrace_notrace_open(struct inode *inode, struct file *file)
return ftrace_regex_open(inode, file, 0);
}
static ssize_t
ftrace_regex_read(struct file *file, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
if (file->f_mode & FMODE_READ)
return seq_read(file, ubuf, cnt, ppos);
else
return -EPERM;
}
static loff_t
ftrace_regex_lseek(struct file *file, loff_t offset, int origin)
{
@ -1882,7 +1872,7 @@ static const struct file_operations ftrace_failures_fops = {
static const struct file_operations ftrace_filter_fops = {
.open = ftrace_filter_open,
.read = ftrace_regex_read,
.read = seq_read,
.write = ftrace_filter_write,
.llseek = ftrace_regex_lseek,
.release = ftrace_filter_release,
@ -1890,7 +1880,7 @@ static const struct file_operations ftrace_filter_fops = {
static const struct file_operations ftrace_notrace_fops = {
.open = ftrace_notrace_open,
.read = ftrace_regex_read,
.read = seq_read,
.write = ftrace_notrace_write,
.llseek = ftrace_regex_lseek,
.release = ftrace_notrace_release,
@ -1992,16 +1982,6 @@ ftrace_graph_open(struct inode *inode, struct file *file)
return ret;
}
static ssize_t
ftrace_graph_read(struct file *file, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
if (file->f_mode & FMODE_READ)
return seq_read(file, ubuf, cnt, ppos);
else
return -EPERM;
}
static int
ftrace_set_func(unsigned long *array, int *idx, char *buffer)
{
@ -2132,7 +2112,7 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
static const struct file_operations ftrace_graph_fops = {
.open = ftrace_graph_open,
.read = ftrace_graph_read,
.read = seq_read,
.write = ftrace_graph_write,
};
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */