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127 lines
3.6 KiB
127 lines
3.6 KiB
/* 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/blkdev.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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#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 dentry *dropped_file; |
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struct dentry *msg_file; |
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struct list_head running_list; |
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atomic_t dropped; |
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}; |
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struct blkcg; |
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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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extern __printf(3, 4) |
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void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, 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, cg, fmt, ...) \ |
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do { \ |
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struct blk_trace *bt = (q)->blk_trace; \ |
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if (unlikely(bt)) \ |
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__trace_note_message(bt, cg, fmt, ##__VA_ARGS__);\ |
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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 = q->blk_trace; |
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if (likely(!bt)) |
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return false; |
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return bt->act_mask & BLK_TC_NOTIFY; |
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} |
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extern void blk_add_driver_data(struct request_queue *q, struct request *rq, |
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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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extern void blk_trace_remove_sysfs(struct device *dev); |
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extern int blk_trace_init_sysfs(struct device *dev); |
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extern struct attribute_group blk_trace_attr_group; |
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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(q, 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_remove_sysfs(dev) do { } while (0) |
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# define blk_trace_note_message_enabled(q) (false) |
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static inline int blk_trace_init_sysfs(struct device *dev) |
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{ |
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return 0; |
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} |
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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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extern void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes); |
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static inline sector_t blk_rq_trace_sector(struct request *rq) |
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{ |
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return blk_rq_is_passthrough(rq) ? 0 : 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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