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tracing: Create seq_buf layer in trace_seq

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Create a seq_buf layer that trace_seq sits on. The seq_buf will not
be limited to page size. This will allow other usages of seq_buf
instead of a hard set PAGE_SIZE one that trace_seq has.

Link: http://lkml.kernel.org/r/20141104160221.864997179@goodmis.org
Link: http://lkml.kernel.org/r/20141114011412.170377300@goodmis.org

Tested-by: Jiri Kosina <jkosina@suse.cz>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
2014-06-25 15:54:42 -04:00
committed by Steven Rostedt
parent 16a8ef2751
commit 3a161d99c4
8 changed files with 536 additions and 124 deletions
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81
include/linux/seq_buf.h Normal file
View File

@@ -0,0 +1,81 @@
#ifndef _LINUX_SEQ_BUF_H
#define _LINUX_SEQ_BUF_H
#include <linux/fs.h>
/*
* Trace sequences are used to allow a function to call several other functions
* to create a string of data to use.
*/
/**
* seq_buf - seq buffer structure
* @buffer: pointer to the buffer
* @size: size of the buffer
* @len: the amount of data inside the buffer
* @readpos: The next position to read in the buffer.
*/
struct seq_buf {
unsigned char *buffer;
unsigned int size;
unsigned int len;
unsigned int readpos;
};
static inline void
seq_buf_init(struct seq_buf *s, unsigned char *buf, unsigned int size)
{
s->buffer = buf;
s->size = size;
s->len = 0;
s->readpos = 0;
}
/*
* seq_buf have a buffer that might overflow. When this happens
* the len and size are set to be equal.
*/
static inline bool
seq_buf_has_overflowed(struct seq_buf *s)
{
return s->len == s->size;
}
static inline void
seq_buf_set_overflow(struct seq_buf *s)
{
s->len = s->size;
}
/*
* How much buffer is left on the seq_buf?
*/
static inline unsigned int
seq_buf_buffer_left(struct seq_buf *s)
{
if (seq_buf_has_overflowed(s))
return 0;
return (s->size - 1) - s->len;
}
extern __printf(2, 3)
int seq_buf_printf(struct seq_buf *s, const char *fmt, ...);
extern __printf(2, 0)
int seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args);
extern int
seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary);
extern int seq_buf_print_seq(struct seq_file *m, struct seq_buf *s);
extern int seq_buf_to_user(struct seq_buf *s, char __user *ubuf,
int cnt);
extern int seq_buf_puts(struct seq_buf *s, const char *str);
extern int seq_buf_putc(struct seq_buf *s, unsigned char c);
extern int seq_buf_putmem(struct seq_buf *s, const void *mem, unsigned int len);
extern int seq_buf_putmem_hex(struct seq_buf *s, const void *mem,
unsigned int len);
extern int seq_buf_path(struct seq_buf *s, const struct path *path);
extern int seq_buf_bitmask(struct seq_buf *s, const unsigned long *maskp,
int nmaskbits);
#endif /* _LINUX_SEQ_BUF_H */