4 #include <linux/blkdev.h>
5 #include <linux/relay.h>
6 #include <linux/compat.h>
7 #include <uapi/linux/blktrace_api.h>
9 #if defined(CONFIG_BLK_DEV_IO_TRACE)
11 #include <linux/sysfs.h>
16 unsigned long __percpu
*sequence
;
17 unsigned char __percpu
*msg_data
;
24 struct dentry
*dropped_file
;
25 struct dentry
*msg_file
;
29 extern int blk_trace_ioctl(struct block_device
*, unsigned, char __user
*);
30 extern void blk_trace_shutdown(struct request_queue
*);
31 extern 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
);
35 void __trace_note_message(struct blk_trace
*, const char *fmt
, ...);
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
44 * Records a (simple) message onto the blktrace stream.
46 * NOTE: BLK_TN_MAX_MSG characters are output at most.
47 * NOTE: Can not use 'static inline' due to presence of var args...
50 #define blk_add_trace_msg(q, fmt, ...) \
52 struct blk_trace *bt = (q)->blk_trace; \
54 __trace_note_message(bt, fmt, ##__VA_ARGS__); \
56 #define BLK_TN_MAX_MSG 128
58 extern void blk_add_driver_data(struct request_queue
*q
, struct request
*rq
,
59 void *data
, size_t len
);
60 extern int blk_trace_setup(struct request_queue
*q
, char *name
, dev_t dev
,
61 struct block_device
*bdev
,
63 extern int blk_trace_startstop(struct request_queue
*q
, int start
);
64 extern int blk_trace_remove(struct request_queue
*q
);
65 extern void blk_trace_remove_sysfs(struct device
*dev
);
66 extern int blk_trace_init_sysfs(struct device
*dev
);
68 extern struct attribute_group blk_trace_attr_group
;
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)
80 static inline int blk_trace_init_sysfs(struct device
*dev
)
85 #endif /* CONFIG_BLK_DEV_IO_TRACE */
89 struct compat_blk_user_trace_setup
{
98 #define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
102 #if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
104 static inline int blk_cmd_buf_len(struct request
*rq
)
106 return (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) ? rq
->cmd_len
* 3 : 1;
109 extern void blk_dump_cmd(char *buf
, struct request
*rq
);
110 extern void blk_fill_rwbs(char *rwbs
, u32 rw
, int bytes
);
112 #endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */