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 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); 36extern __printf(2, 3) 37void __trace_note_message(struct blk_trace *, const char *fmt, ...); 38 39/** 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 44 * 45 * Description: 46 * Records a (simple) message onto the blktrace stream. 47 * 48 * NOTE: BLK_TN_MAX_MSG characters are output at most. 49 * NOTE: Can not use 'static inline' due to presence of var args... 50 * 51 **/ 52#define blk_add_trace_msg(q, fmt, ...) \ 53 do { \ 54 struct blk_trace *bt = (q)->blk_trace; \ 55 if (unlikely(bt)) \ 56 __trace_note_message(bt, fmt, ##__VA_ARGS__); \ 57 } while (0) 58#define BLK_TN_MAX_MSG 128 59 60extern void blk_add_driver_data(struct request_queue *q, struct request *rq, 61 void *data, size_t len); 62extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 63 struct block_device *bdev, 64 char __user *arg); 65extern int blk_trace_startstop(struct request_queue *q, int start); 66extern int blk_trace_remove(struct request_queue *q); 67extern void blk_trace_remove_sysfs(struct device *dev); 68extern int blk_trace_init_sysfs(struct device *dev); 69 70extern struct attribute_group blk_trace_attr_group; 71 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) 82static inline int blk_trace_init_sysfs(struct device *dev) 83{ 84 return 0; 85} 86 87#endif /* CONFIG_BLK_DEV_IO_TRACE */ 88 89#ifdef CONFIG_COMPAT 90 91struct compat_blk_user_trace_setup { 92 char name[BLKTRACE_BDEV_SIZE]; 93 u16 act_mask; 94 u32 buf_size; 95 u32 buf_nr; 96 compat_u64 start_lba; 97 compat_u64 end_lba; 98 u32 pid; 99}; 100#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup) 101 102#endif 103 104#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK) 105 106static inline int blk_cmd_buf_len(struct request *rq) 107{ 108 return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1; 109} 110 111extern void blk_dump_cmd(char *buf, struct request *rq); 112extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes); 113 114#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */ 115 116#endif 117