Contributors: 24
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jens Axboe |
130 |
25.59% |
5 |
12.82% |
| Christof Schmitt |
56 |
11.02% |
1 |
2.56% |
| Alan D. Brunelle |
52 |
10.24% |
1 |
2.56% |
| Jan Kara |
49 |
9.65% |
3 |
7.69% |
| Christoph Hellwig |
45 |
8.86% |
4 |
10.26% |
| Shaohua Li |
42 |
8.27% |
2 |
5.13% |
| Arnd Bergmann |
33 |
6.50% |
2 |
5.13% |
| Stefan Raspl |
26 |
5.12% |
1 |
2.56% |
| Li Zefan |
19 |
3.74% |
1 |
2.56% |
| Martin K. Petersen |
10 |
1.97% |
2 |
5.13% |
| yu kuai |
8 |
1.57% |
1 |
2.56% |
| Bart Van Assche |
5 |
0.98% |
1 |
2.56% |
| Stephen Rothwell |
5 |
0.98% |
1 |
2.56% |
| Arnaldo Carvalho de Melo |
5 |
0.98% |
2 |
5.13% |
| Martin Schwidefsky |
5 |
0.98% |
2 |
5.13% |
| Andrew Morton |
4 |
0.79% |
2 |
5.13% |
| David Howells |
3 |
0.59% |
1 |
2.56% |
| Shawn Du |
2 |
0.39% |
1 |
2.56% |
| Tejun Heo |
2 |
0.39% |
1 |
2.56% |
| Jaswinder Singh Rajput |
2 |
0.39% |
1 |
2.56% |
| Pavel Machek |
2 |
0.39% |
1 |
2.56% |
| Chen Gang S |
1 |
0.20% |
1 |
2.56% |
| Greg Kroah-Hartman |
1 |
0.20% |
1 |
2.56% |
| Vivek Goyal |
1 |
0.20% |
1 |
2.56% |
| Total |
508 |
|
39 |
|
/* 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