128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BLKTRACE_H
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#define BLKTRACE_H
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#include <linux/blk-mq.h>
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#include <linux/relay.h>
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#include <linux/compat.h>
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#include <uapi/linux/blktrace_api.h>
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#include <linux/list.h>
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#include <linux/blk_types.h>
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#if defined(CONFIG_BLK_DEV_IO_TRACE)
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#include <linux/sysfs.h>
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struct blk_trace {
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int trace_state;
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struct rchan *rchan;
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unsigned long __percpu *sequence;
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unsigned char __percpu *msg_data;
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u16 act_mask;
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u64 start_lba;
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u64 end_lba;
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u32 pid;
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u32 dev;
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struct dentry *dir;
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struct list_head running_list;
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atomic_t dropped;
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};
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extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
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extern void blk_trace_shutdown(struct request_queue *);
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__printf(3, 4) void __blk_trace_note_message(struct blk_trace *bt,
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struct cgroup_subsys_state *css, const char *fmt, ...);
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/**
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* blk_add_trace_msg - Add a (simple) message to the blktrace stream
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* @q: queue the io is for
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* @fmt: format to print message in
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* args... Variable argument list for format
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*
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* Description:
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* Records a (simple) message onto the blktrace stream.
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*
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* NOTE: BLK_TN_MAX_MSG characters are output at most.
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* NOTE: Can not use 'static inline' due to presence of var args...
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*
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**/
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#define blk_add_cgroup_trace_msg(q, css, fmt, ...) \
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do { \
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struct blk_trace *bt; \
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\
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rcu_read_lock(); \
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bt = rcu_dereference((q)->blk_trace); \
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if (unlikely(bt)) \
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__blk_trace_note_message(bt, css, fmt, ##__VA_ARGS__);\
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rcu_read_unlock(); \
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} while (0)
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#define blk_add_trace_msg(q, fmt, ...) \
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blk_add_cgroup_trace_msg(q, NULL, fmt, ##__VA_ARGS__)
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#define BLK_TN_MAX_MSG 128
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static inline bool blk_trace_note_message_enabled(struct request_queue *q)
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{
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struct blk_trace *bt;
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bool ret;
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rcu_read_lock();
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bt = rcu_dereference(q->blk_trace);
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ret = bt && (bt->act_mask & BLK_TC_NOTIFY);
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rcu_read_unlock();
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return ret;
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}
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extern void blk_add_driver_data(struct request *rq, void *data, size_t len);
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extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
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struct block_device *bdev,
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char __user *arg);
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extern int blk_trace_startstop(struct request_queue *q, int start);
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extern int blk_trace_remove(struct request_queue *q);
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#else /* !CONFIG_BLK_DEV_IO_TRACE */
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# define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
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# define blk_trace_shutdown(q) do { } while (0)
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# define blk_add_driver_data(rq, data, len) do {} while (0)
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# define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY)
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# define blk_trace_startstop(q, start) (-ENOTTY)
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# define blk_trace_remove(q) (-ENOTTY)
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# define blk_add_trace_msg(q, fmt, ...) do { } while (0)
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# define blk_add_cgroup_trace_msg(q, cg, fmt, ...) do { } while (0)
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# define blk_trace_note_message_enabled(q) (false)
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#endif /* CONFIG_BLK_DEV_IO_TRACE */
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#ifdef CONFIG_COMPAT
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struct compat_blk_user_trace_setup {
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char name[BLKTRACE_BDEV_SIZE];
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u16 act_mask;
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u32 buf_size;
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u32 buf_nr;
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compat_u64 start_lba;
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compat_u64 end_lba;
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u32 pid;
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};
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#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
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#endif
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void blk_fill_rwbs(char *rwbs, blk_opf_t opf);
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static inline sector_t blk_rq_trace_sector(struct request *rq)
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{
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/*
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* Tracing should ignore starting sector for passthrough requests and
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* requests where starting sector didn't get set.
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*/
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if (blk_rq_is_passthrough(rq) || blk_rq_pos(rq) == (sector_t)-1)
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return 0;
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return blk_rq_pos(rq);
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}
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static inline unsigned int blk_rq_trace_nr_sectors(struct request *rq)
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{
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return blk_rq_is_passthrough(rq) ? 0 : blk_rq_sectors(rq);
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}
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#endif
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