include/linux/blktrace_api.h

   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
   9 #if defined(CONFIG_BLK_DEV_IO_TRACE)
  10
  11 #include <linux/sysfs.h>
  12
  13 struct blk_trace {
  14         int trace_state;
  15         bool rq_based;
  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         atomic_t dropped;
  28 };
  29
  30 extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
  31 extern void blk_trace_shutdown(struct request_queue *);
  32 extern int do_blk_trace_setup(struct request_queue *q, char *name,
  33                               dev_t dev, struct block_device *bdev,
  34                               struct blk_user_trace_setup *buts);
  35 extern __printf(2, 3)
  36 void __trace_note_message(struct blk_trace *, 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_trace_msg(q, fmt, ...)                                  \
  52         do {                                                            \
  53                 struct blk_trace *bt = (q)->blk_trace;                  \
  54                 if (unlikely(bt))                                       \
  55                         __trace_note_message(bt, fmt, ##__VA_ARGS__);   \
  56         } while (0)
  57 #define BLK_TN_MAX_MSG          128
  58
  59 extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
  60                                 void *data, size_t len);
  61 extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
  62                            struct block_device *bdev,
  63                            char __user *arg);
  64 extern int blk_trace_startstop(struct request_queue *q, int start);
  65 extern int blk_trace_remove(struct request_queue *q);
  66 extern void blk_trace_remove_sysfs(struct device *dev);
  67 extern int blk_trace_init_sysfs(struct device *dev);
  68
  69 extern struct attribute_group blk_trace_attr_group;
  70
  71 #else /* !CONFIG_BLK_DEV_IO_TRACE */
  72 # define blk_trace_ioctl(bdev, cmd, arg)                (-ENOTTY)
  73 # define blk_trace_shutdown(q)                          do { } while (0)
  74 # define do_blk_trace_setup(q, name, dev, bdev, buts)   (-ENOTTY)
  75 # define blk_add_driver_data(q, rq, data, len)          do {} while (0)
  76 # define blk_trace_setup(q, name, dev, bdev, arg)       (-ENOTTY)
  77 # define blk_trace_startstop(q, start)                  (-ENOTTY)
  78 # define blk_trace_remove(q)                            (-ENOTTY)
  79 # define blk_add_trace_msg(q, fmt, ...)                 do { } while (0)
  80 # define blk_trace_remove_sysfs(dev)                    do { } while (0)
  81 static inline int blk_trace_init_sysfs(struct device *dev)
  82 {
  83         return 0;
  84 }
  85
  86 #endif /* CONFIG_BLK_DEV_IO_TRACE */
  87
  88 #ifdef CONFIG_COMPAT
  89
  90 struct compat_blk_user_trace_setup {
  91         char name[32];
  92         u16 act_mask;
  93         u32 buf_size;
  94         u32 buf_nr;
  95         compat_u64 start_lba;
  96         compat_u64 end_lba;
  97         u32 pid;
  98 };
  99 #define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
 100
 101 #endif
 102
 103 #if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
 104
 105 static inline int blk_cmd_buf_len(struct request *rq)
 106 {
 107         return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1;
 108 }
 109
 110 extern void blk_dump_cmd(char *buf, struct request *rq);
 111 extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);
 112
 113 #endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
 114
 115 #endif