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