Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133/* 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 version; int trace_state; struct rchan *rchan; unsigned long __percpu *sequence; unsigned char __percpu *msg_data; u64 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