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3a161d99c4
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>
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
#ifndef _LINUX_SEQ_BUF_H
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#define _LINUX_SEQ_BUF_H
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#include <linux/fs.h>
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/*
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* Trace sequences are used to allow a function to call several other functions
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* to create a string of data to use.
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*/
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/**
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* seq_buf - seq buffer structure
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* @buffer: pointer to the buffer
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* @size: size of the buffer
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* @len: the amount of data inside the buffer
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* @readpos: The next position to read in the buffer.
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*/
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struct seq_buf {
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unsigned char *buffer;
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unsigned int size;
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unsigned int len;
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unsigned int readpos;
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};
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static inline void
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seq_buf_init(struct seq_buf *s, unsigned char *buf, unsigned int size)
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{
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s->buffer = buf;
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s->size = size;
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s->len = 0;
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s->readpos = 0;
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}
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/*
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* seq_buf have a buffer that might overflow. When this happens
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* the len and size are set to be equal.
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*/
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static inline bool
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seq_buf_has_overflowed(struct seq_buf *s)
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{
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return s->len == s->size;
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}
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static inline void
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seq_buf_set_overflow(struct seq_buf *s)
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{
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s->len = s->size;
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}
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/*
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* How much buffer is left on the seq_buf?
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*/
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static inline unsigned int
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seq_buf_buffer_left(struct seq_buf *s)
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{
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if (seq_buf_has_overflowed(s))
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return 0;
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return (s->size - 1) - s->len;
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}
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extern __printf(2, 3)
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int seq_buf_printf(struct seq_buf *s, const char *fmt, ...);
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extern __printf(2, 0)
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int seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args);
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extern int
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seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary);
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extern int seq_buf_print_seq(struct seq_file *m, struct seq_buf *s);
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extern int seq_buf_to_user(struct seq_buf *s, char __user *ubuf,
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int cnt);
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extern int seq_buf_puts(struct seq_buf *s, const char *str);
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extern int seq_buf_putc(struct seq_buf *s, unsigned char c);
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extern int seq_buf_putmem(struct seq_buf *s, const void *mem, unsigned int len);
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extern int seq_buf_putmem_hex(struct seq_buf *s, const void *mem,
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unsigned int len);
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extern int seq_buf_path(struct seq_buf *s, const struct path *path);
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extern int seq_buf_bitmask(struct seq_buf *s, const unsigned long *maskp,
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int nmaskbits);
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#endif /* _LINUX_SEQ_BUF_H */
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