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#include <linux/list.h>
9
10#if defined(CONFIG_BLK_DEV_IO_TRACE)
11
12#include <linux/sysfs.h>
13
14struct blk_trace {
15 int trace_state;
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 struct list_head running_list;
28 atomic_t dropped;
29};
30
31extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
32extern void blk_trace_shutdown(struct request_queue *);
33extern __printf(2, 3)
34void __trace_note_message(struct blk_trace *, const char *fmt, ...);
35
36/**
37 * blk_add_trace_msg - Add a (simple) message to the blktrace stream
38 * @q: queue the io is for
39 * @fmt: format to print message in
40 * args... Variable argument list for format
41 *
42 * Description:
43 * Records a (simple) message onto the blktrace stream.
44 *
45 * NOTE: BLK_TN_MAX_MSG characters are output at most.
46 * NOTE: Can not use 'static inline' due to presence of var args...
47 *
48 **/
49#define blk_add_trace_msg(q, fmt, ...) \
50 do { \
51 struct blk_trace *bt = (q)->blk_trace; \
52 if (unlikely(bt)) \
53 __trace_note_message(bt, fmt, ##__VA_ARGS__); \
54 } while (0)
55#define BLK_TN_MAX_MSG 128
56
57static inline bool blk_trace_note_message_enabled(struct request_queue *q)
58{
59 struct blk_trace *bt = q->blk_trace;
60 if (likely(!bt))
61 return false;
62 return bt->act_mask & BLK_TC_NOTIFY;
63}
64
65extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
66 void *data, size_t len);
67extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
68 struct block_device *bdev,
69 char __user *arg);
70extern int blk_trace_startstop(struct request_queue *q, int start);
71extern int blk_trace_remove(struct request_queue *q);
72extern void blk_trace_remove_sysfs(struct device *dev);
73extern int blk_trace_init_sysfs(struct device *dev);
74
75extern struct attribute_group blk_trace_attr_group;
76
77#else /* !CONFIG_BLK_DEV_IO_TRACE */
78# define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
79# define blk_trace_shutdown(q) do { } while (0)
80# define blk_add_driver_data(q, rq, data, len) do {} while (0)
81# define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY)
82# define blk_trace_startstop(q, start) (-ENOTTY)
83# define blk_trace_remove(q) (-ENOTTY)
84# define blk_add_trace_msg(q, fmt, ...) do { } while (0)
85# define blk_trace_remove_sysfs(dev) do { } while (0)
86# define blk_trace_note_message_enabled(q) (false)
87static inline int blk_trace_init_sysfs(struct device *dev)
88{
89 return 0;
90}
91
92#endif /* CONFIG_BLK_DEV_IO_TRACE */
93
94#ifdef CONFIG_COMPAT
95
96struct compat_blk_user_trace_setup {
97 char name[BLKTRACE_BDEV_SIZE];
98 u16 act_mask;
99 u32 buf_size;
100 u32 buf_nr;
101 compat_u64 start_lba;
102 compat_u64 end_lba;
103 u32 pid;
104};
105#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
106
107#endif
108
109extern void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes);
110
111static inline sector_t blk_rq_trace_sector(struct request *rq)
112{
113 return blk_rq_is_passthrough(rq) ? 0 : blk_rq_pos(rq);
114}
115
116static inline unsigned int blk_rq_trace_nr_sectors(struct request *rq)
117{
118 return blk_rq_is_passthrough(rq) ? 0 : blk_rq_sectors(rq);
119}
120
121#endif