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products/sources/formale Sprachen/C/Linux/include/linux/ (Open Source Betriebssystem Version 6.17.9^©) Datei vom 24.10.2025 mit Größe 3 kB

Quelle blktrace_api.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BLKTRACE_H
#define BLKTRACE_H

#include <linux/blk-mq.h>
#include <linux/relay.h>
#include <linux/compat.h>
#include <uapi/linux/blktrace_api.h>
#include <linux/list.h>
#include <linux/blk_types.h>

#if defined(CONFIG_BLK_DEV_IO_TRACE)

#include <linux/sysfs.h>

struct blk_trace {
int trace_state;
struct rchan *rchan;
unsigned long __percpu *sequence;
unsigned char __percpu *msg_data;
u16 act_mask;
u64 start_lba;
u64 end_lba;
u32 pid;
u32 dev;
struct dentry *dir;
struct list_head running_list;
atomic_t dropped;
};

extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
extern void blk_trace_shutdown(struct request_queue *);
__printf(3, 4) void __blk_trace_note_message(struct blk_trace *bt,
  struct cgroup_subsys_state *css, const char *fmt, ...);

/**
* blk_add_trace_msg - Add a (simple) message to the blktrace stream
* @q: queue the io is for
* @fmt: format to print message in
* args... Variable argument list for format
*
* Description:
*     Records a (simple) message onto the blktrace stream.
*
*     NOTE: BLK_TN_MAX_MSG characters are output at most.
*     NOTE: Can not use 'static inline' due to presence of var args...
*
**/
#define blk_add_cgroup_trace_msg(q, css, fmt, ...)   \
do {        \
  struct blk_trace *bt;     \
         \
  rcu_read_lock();     \
  bt = rcu_dereference((q)->blk_trace);   \
  if (unlikely(bt))     \
   __blk_trace_note_message(bt, css, fmt, ##__VA_ARGS__);\
  rcu_read_unlock();     \
} while (0)
#define blk_add_trace_msg(q, fmt, ...)     \
blk_add_cgroup_trace_msg(q, NULL, fmt, ##__VA_ARGS__)
#define BLK_TN_MAX_MSG  128

static inline bool blk_trace_note_message_enabled(struct request_queue *q)
{
struct blk_trace *bt;
bool ret;

rcu_read_lock();
bt = rcu_dereference(q->blk_trace);
ret = bt && (bt->act_mask & BLK_TC_NOTIFY);
rcu_read_unlock();
return ret;
}

extern void blk_add_driver_data(struct request *rq, void *data, size_t len);
extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
      struct block_device *bdev,
      char __user *arg);
extern int blk_trace_startstop(struct request_queue *q, int start);
extern int blk_trace_remove(struct request_queue *q);

#else /* !CONFIG_BLK_DEV_IO_TRACE */
# define blk_trace_ioctl(bdev, cmd, arg)  (-ENOTTY)
# define blk_trace_shutdown(q)    do { } while (0)
# define blk_add_driver_data(rq, data, len)  do {} while (0)
# define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY)
# define blk_trace_startstop(q, start)   (-ENOTTY)
# define blk_add_trace_msg(q, fmt, ...)   do { } while (0)
# define blk_add_cgroup_trace_msg(q, cg, fmt, ...) do { } while (0)
# define blk_trace_note_message_enabled(q)  (false)

static inline int blk_trace_remove(struct request_queue *q)
{
return -ENOTTY;
}
#endif /* CONFIG_BLK_DEV_IO_TRACE */

#ifdef CONFIG_COMPAT

struct compat_blk_user_trace_setup {
char name[BLKTRACE_BDEV_SIZE];
u16 act_mask;
u32 buf_size;
u32 buf_nr;
compat_u64 start_lba;
compat_u64 end_lba;
u32 pid;
};
#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)

#endif

void blk_fill_rwbs(char *rwbs, blk_opf_t opf);

static inline sector_t blk_rq_trace_sector(struct request *rq)
{
/*
* Tracing should ignore starting sector for passthrough requests and
* requests where starting sector didn't get set.
*/
if (blk_rq_is_passthrough(rq) || blk_rq_pos(rq) == (sector_t)-1)
  return 0;
return blk_rq_pos(rq);
}

static inline unsigned int blk_rq_trace_nr_sectors(struct request *rq)
{
return blk_rq_is_passthrough(rq) ? 0 : blk_rq_sectors(rq);
}

#endif

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