forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
127 lines
3.5 KiB
127 lines
3.5 KiB
/* 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_trace_remove(q) (-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) |
|
#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
|
|
|