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>
10 #if defined(CONFIG_BLK_DEV_IO_TRACE)
12 #include <linux/sysfs.h>
17 unsigned long __percpu
*sequence
;
18 unsigned char __percpu
*msg_data
;
25 struct dentry
*dropped_file
;
26 struct dentry
*msg_file
;
27 struct list_head running_list
;
31 extern int blk_trace_ioctl(struct block_device
*, unsigned, char __user
*);
32 extern void blk_trace_shutdown(struct request_queue
*);
33 extern int do_blk_trace_setup(struct request_queue
*q
, char *name
,
34 dev_t dev
, struct block_device
*bdev
,
35 struct blk_user_trace_setup
*buts
);
37 void __trace_note_message(struct blk_trace
*, const char *fmt
, ...);
40 * blk_add_trace_msg - Add a (simple) message to the blktrace stream
41 * @q: queue the io is for
42 * @fmt: format to print message in
43 * args... Variable argument list for format
46 * Records a (simple) message onto the blktrace stream.
48 * NOTE: BLK_TN_MAX_MSG characters are output at most.
49 * NOTE: Can not use 'static inline' due to presence of var args...
52 #define blk_add_trace_msg(q, fmt, ...) \
54 struct blk_trace *bt = (q)->blk_trace; \
56 __trace_note_message(bt, fmt, ##__VA_ARGS__); \
58 #define BLK_TN_MAX_MSG 128
60 extern void blk_add_driver_data(struct request_queue
*q
, struct request
*rq
,
61 void *data
, size_t len
);
62 extern int blk_trace_setup(struct request_queue
*q
, char *name
, dev_t dev
,
63 struct block_device
*bdev
,
65 extern int blk_trace_startstop(struct request_queue
*q
, int start
);
66 extern int blk_trace_remove(struct request_queue
*q
);
67 extern void blk_trace_remove_sysfs(struct device
*dev
);
68 extern int blk_trace_init_sysfs(struct device
*dev
);
70 extern struct attribute_group blk_trace_attr_group
;
72 #else /* !CONFIG_BLK_DEV_IO_TRACE */
73 # define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
74 # define blk_trace_shutdown(q) do { } while (0)
75 # define do_blk_trace_setup(q, name, dev, bdev, buts) (-ENOTTY)
76 # define blk_add_driver_data(q, rq, data, len) do {} while (0)
77 # define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY)
78 # define blk_trace_startstop(q, start) (-ENOTTY)
79 # define blk_trace_remove(q) (-ENOTTY)
80 # define blk_add_trace_msg(q, fmt, ...) do { } while (0)
81 # define blk_trace_remove_sysfs(dev) do { } while (0)
82 static inline int blk_trace_init_sysfs(struct device
*dev
)
87 #endif /* CONFIG_BLK_DEV_IO_TRACE */
91 struct compat_blk_user_trace_setup
{
92 char name
[BLKTRACE_BDEV_SIZE
];
100 #define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
104 #if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
106 static inline int blk_cmd_buf_len(struct request
*rq
)
108 return (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) ? rq
->cmd_len
* 3 : 1;
111 extern void blk_dump_cmd(char *buf
, struct request
*rq
);
112 extern void blk_fill_rwbs(char *rwbs
, u32 rw
, int bytes
);
114 #endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */