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         struct rchan *rchan;
  16         unsigned long __percpu *sequence;
  17         unsigned char __percpu *msg_data;
  18         u16 act_mask;
  19         u64 start_lba;
  20         u64 end_lba;
  21         u32 pid;
  22         u32 dev;
  23         struct dentry *dir;
  24         struct dentry *dropped_file;
  25         struct dentry *msg_file;
  26         atomic_t dropped;
  27 };
  28
  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);
  34 extern __printf(2, 3)
  35 void __trace_note_message(struct blk_trace *, const char *fmt, ...);
  36
  37 /**
  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
  42  *
  43  * Description:
  44  *     Records a (simple) message onto the blktrace stream.
  45  *
  46  *     NOTE: BLK_TN_MAX_MSG characters are output at most.
  47  *     NOTE: Can not use 'static inline' due to presence of var args...
  48  *
  49  **/
  50 #define blk_add_trace_msg(q, fmt, ...)                                  \
  51         do {                                                            \
  52                 struct blk_trace *bt = (q)->blk_trace;                  \
  53                 if (unlikely(bt))                                       \
  54                         __trace_note_message(bt, fmt, ##__VA_ARGS__);   \
  55         } while (0)
  56 #define BLK_TN_MAX_MSG          128
  57
  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,
  62                            char __user *arg);
  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);
  67
  68 extern struct attribute_group blk_trace_attr_group;
  69
  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)
  81 {
  82         return 0;
  83 }
  84
  85 #endif /* CONFIG_BLK_DEV_IO_TRACE */
  86
  87 #ifdef CONFIG_COMPAT
  88
  89 struct compat_blk_user_trace_setup {
  90         char name[32];
  91         u16 act_mask;
  92         u32 buf_size;
  93         u32 buf_nr;
  94         compat_u64 start_lba;
  95         compat_u64 end_lba;
  96         u32 pid;
  97 };
  98 #define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
  99
 100 #endif
 101
 102 #if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
 103
 104 static inline int blk_cmd_buf_len(struct request *rq)
 105 {
 106         return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1;
 107 }
 108
 109 extern void blk_dump_cmd(char *buf, struct request *rq);
 110 extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);
 111
 112 #endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
 113
 114 #endif