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#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
31struct blkcg;
32
33extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
34extern void blk_trace_shutdown(struct request_queue *);
35extern __printf(3, 4)
36void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, 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_cgroup_trace_msg(q, cg, fmt, ...) \
52 do { \
53 struct blk_trace *bt = (q)->blk_trace; \
54 if (unlikely(bt)) \
55 __trace_note_message(bt, cg, fmt, ##__VA_ARGS__);\
56 } while (0)
57#define blk_add_trace_msg(q, fmt, ...) \
58 blk_add_cgroup_trace_msg(q, NULL, fmt, ##__VA_ARGS__)
59#define BLK_TN_MAX_MSG 128
60
61static inline bool blk_trace_note_message_enabled(struct request_queue *q)
62{
63 struct blk_trace *bt = q->blk_trace;
64 if (likely(!bt))
65 return false;
66 return bt->act_mask & BLK_TC_NOTIFY;
67}
68
69extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
70 void *data, size_t len);
71extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
72 struct block_device *bdev,
73 char __user *arg);
74extern int blk_trace_startstop(struct request_queue *q, int start);
75extern int blk_trace_remove(struct request_queue *q);
76extern void blk_trace_remove_sysfs(struct device *dev);
77extern int blk_trace_init_sysfs(struct device *dev);
78
79extern struct attribute_group blk_trace_attr_group;
80
81#else /* !CONFIG_BLK_DEV_IO_TRACE */
82# define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
83# define blk_trace_shutdown(q) do { } while (0)
84# define blk_add_driver_data(q, rq, data, len) do {} while (0)
85# define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY)
86# define blk_trace_startstop(q, start) (-ENOTTY)
87# define blk_trace_remove(q) (-ENOTTY)
88# define blk_add_trace_msg(q, fmt, ...) do { } while (0)
89# define blk_add_cgroup_trace_msg(q, cg, fmt, ...) do { } while (0)
90# define blk_trace_remove_sysfs(dev) do { } while (0)
91# define blk_trace_note_message_enabled(q) (false)
92static inline int blk_trace_init_sysfs(struct device *dev)
93{
94 return 0;
95}
96
97#endif /* CONFIG_BLK_DEV_IO_TRACE */
98
99#ifdef CONFIG_COMPAT
100
101struct compat_blk_user_trace_setup {
102 char name[BLKTRACE_BDEV_SIZE];
103 u16 act_mask;
104 u32 buf_size;
105 u32 buf_nr;
106 compat_u64 start_lba;
107 compat_u64 end_lba;
108 u32 pid;
109};
110#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
111
112#endif
113
114extern void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes);
115
116static inline sector_t blk_rq_trace_sector(struct request *rq)
117{
118 return blk_rq_is_passthrough(rq) ? 0 : blk_rq_pos(rq);
119}
120
121static inline unsigned int blk_rq_trace_nr_sectors(struct request *rq)
122{
123 return blk_rq_is_passthrough(rq) ? 0 : blk_rq_sectors(rq);
124}
125
126#endif