cregit-Linux how code gets into the kernel

Release 4.14 include/linux/blktrace_api.h

Directory: include/linux
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BLKTRACE_H

#define BLKTRACE_H

#include <linux/blkdev.h>
#include <linux/relay.h>
#include <linux/compat.h>
#include <uapi/linux/blktrace_api.h>
#include <linux/list.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 dentry *dropped_file;
	
struct dentry *msg_file;
	
struct list_head running_list;
	
atomic_t dropped;
};

struct blkcg;

extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
extern void blk_trace_shutdown(struct request_queue *);
extern __printf(3, 4)
void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, 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, cg, fmt, ...)			\
	do {                                                            \
                struct blk_trace *bt = (q)->blk_trace;                  \
                if (unlikely(bt))                                       \
                        __trace_note_message(bt, cg, fmt, ##__VA_ARGS__);\
        } 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 = q->blk_trace; if (likely(!bt)) return false; return bt->act_mask & BLK_TC_NOTIFY; }

Contributors

PersonTokensPropCommitsCommitProp
Shaohua Li39100.00%1100.00%
Total39100.00%1100.00%

extern void blk_add_driver_data(struct request_queue *q, 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); extern void blk_trace_remove_sysfs(struct device *dev); extern int blk_trace_init_sysfs(struct device *dev); extern struct attribute_group blk_trace_attr_group; #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(q, 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_remove_sysfs(dev) do { } while (0) # define blk_trace_note_message_enabled(q) (false)
static inline int blk_trace_init_sysfs(struct device *dev) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Li Zefan15100.00%1100.00%
Total15100.00%1100.00%

#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 extern void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes);
static inline sector_t blk_rq_trace_sector(struct request *rq) { return blk_rq_is_passthrough(rq) ? 0 : blk_rq_pos(rq); }

Contributors

PersonTokensPropCommitsCommitProp
Li Zefan1560.00%133.33%
Christoph Hellwig1040.00%266.67%
Total25100.00%3100.00%


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

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig2076.92%266.67%
Li Zefan623.08%133.33%
Total26100.00%3100.00%

#endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe11220.78%310.34%
Shaohua Li8415.58%26.90%
Christof Schmitt6812.62%13.45%
Alan D. Brunelle468.53%26.90%
Christoph Hellwig468.53%26.90%
Li Zefan468.53%26.90%
Stephen Rothwell376.86%13.45%
Stefan Raspl336.12%13.45%
Zdenek Kabelac173.15%13.45%
Arnaldo Carvalho de Melo101.86%26.90%
Shawn Du71.30%13.45%
Jan Kara71.30%13.45%
Martin K. Petersen61.11%13.45%
Sven Schuetz61.11%13.45%
David Howells40.74%13.45%
Tejun Heo20.37%13.45%
Joe Perches20.37%26.90%
Jaswinder Singh Rajput20.37%13.45%
Arnd Bergmann20.37%13.45%
Greg Kroah-Hartman10.19%13.45%
Chen Gang S10.19%13.45%
Total539100.00%29100.00%
Directory: include/linux
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