Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef BLKTRACE_H
2#define BLKTRACE_H
3
4#include <linux/blkdev.h>
5#include <linux/relay.h>
6#include <linux/compat.h>
7#include <uapi/linux/blktrace_api.h>
8
9#if defined(CONFIG_BLK_DEV_IO_TRACE)
10
11#include <linux/sysfs.h>
12
13struct blk_trace {
14 int trace_state;
15 bool rq_based;
16 struct rchan *rchan;
17 unsigned long __percpu *sequence;
18 unsigned char __percpu *msg_data;
19 u16 act_mask;
20 u64 start_lba;
21 u64 end_lba;
22 u32 pid;
23 u32 dev;
24 struct dentry *dir;
25 struct dentry *dropped_file;
26 struct dentry *msg_file;
27 atomic_t dropped;
28};
29
30extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
31extern void blk_trace_shutdown(struct request_queue *);
32extern int do_blk_trace_setup(struct request_queue *q, char *name,
33 dev_t dev, struct block_device *bdev,
34 struct blk_user_trace_setup *buts);
35extern __printf(2, 3)
36void __trace_note_message(struct blk_trace *, const char *fmt, ...);
37
38/**
39 * blk_add_trace_msg - Add a (simple) message to the blktrace stream
40 * @q: queue the io is for
41 * @fmt: format to print message in
42 * args... Variable argument list for format
43 *
44 * Description:
45 * Records a (simple) message onto the blktrace stream.
46 *
47 * NOTE: BLK_TN_MAX_MSG characters are output at most.
48 * NOTE: Can not use 'static inline' due to presence of var args...
49 *
50 **/
51#define blk_add_trace_msg(q, fmt, ...) \
52 do { \
53 struct blk_trace *bt = (q)->blk_trace; \
54 if (unlikely(bt)) \
55 __trace_note_message(bt, fmt, ##__VA_ARGS__); \
56 } while (0)
57#define BLK_TN_MAX_MSG 128
58
59extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
60 void *data, size_t len);
61extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
62 struct block_device *bdev,
63 char __user *arg);
64extern int blk_trace_startstop(struct request_queue *q, int start);
65extern int blk_trace_remove(struct request_queue *q);
66extern void blk_trace_remove_sysfs(struct device *dev);
67extern int blk_trace_init_sysfs(struct device *dev);
68
69extern struct attribute_group blk_trace_attr_group;
70
71#else /* !CONFIG_BLK_DEV_IO_TRACE */
72# define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
73# define blk_trace_shutdown(q) do { } while (0)
74# define do_blk_trace_setup(q, name, dev, bdev, buts) (-ENOTTY)
75# define blk_add_driver_data(q, rq, data, len) do {} while (0)
76# define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY)
77# define blk_trace_startstop(q, start) (-ENOTTY)
78# define blk_trace_remove(q) (-ENOTTY)
79# define blk_add_trace_msg(q, fmt, ...) do { } while (0)
80# define blk_trace_remove_sysfs(dev) do { } while (0)
81static inline int blk_trace_init_sysfs(struct device *dev)
82{
83 return 0;
84}
85
86#endif /* CONFIG_BLK_DEV_IO_TRACE */
87
88#ifdef CONFIG_COMPAT
89
90struct compat_blk_user_trace_setup {
91 char name[32];
92 u16 act_mask;
93 u32 buf_size;
94 u32 buf_nr;
95 compat_u64 start_lba;
96 compat_u64 end_lba;
97 u32 pid;
98};
99#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
100
101#endif
102
103#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
104
105static inline int blk_cmd_buf_len(struct request *rq)
106{
107 return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1;
108}
109
110extern void blk_dump_cmd(char *buf, struct request *rq);
111extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);
112
113#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
114
115#endif