278 lines
7.7 KiB
C
278 lines
7.7 KiB
C
#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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/*
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* Trace categories
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*/
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enum blktrace_cat {
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BLK_TC_READ = 1 << 0, /* reads */
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BLK_TC_WRITE = 1 << 1, /* writes */
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BLK_TC_BARRIER = 1 << 2, /* barrier */
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BLK_TC_SYNC = 1 << 3, /* sync IO */
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BLK_TC_QUEUE = 1 << 4, /* queueing/merging */
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BLK_TC_REQUEUE = 1 << 5, /* requeueing */
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BLK_TC_ISSUE = 1 << 6, /* issue */
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BLK_TC_COMPLETE = 1 << 7, /* completions */
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BLK_TC_FS = 1 << 8, /* fs requests */
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BLK_TC_PC = 1 << 9, /* pc requests */
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BLK_TC_NOTIFY = 1 << 10, /* special message */
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BLK_TC_AHEAD = 1 << 11, /* readahead */
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BLK_TC_META = 1 << 12, /* metadata */
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BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
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};
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#define BLK_TC_SHIFT (16)
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#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
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/*
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* Basic trace actions
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*/
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enum blktrace_act {
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__BLK_TA_QUEUE = 1, /* queued */
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__BLK_TA_BACKMERGE, /* back merged to existing rq */
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__BLK_TA_FRONTMERGE, /* front merge to existing rq */
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__BLK_TA_GETRQ, /* allocated new request */
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__BLK_TA_SLEEPRQ, /* sleeping on rq allocation */
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__BLK_TA_REQUEUE, /* request requeued */
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__BLK_TA_ISSUE, /* sent to driver */
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__BLK_TA_COMPLETE, /* completed by driver */
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__BLK_TA_PLUG, /* queue was plugged */
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__BLK_TA_UNPLUG_IO, /* queue was unplugged by io */
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__BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */
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__BLK_TA_INSERT, /* insert request */
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__BLK_TA_SPLIT, /* bio was split */
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__BLK_TA_BOUNCE, /* bio was bounced */
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__BLK_TA_REMAP, /* bio was remapped */
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};
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/*
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* Trace actions in full. Additionally, read or write is masked
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*/
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#define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
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#define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
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#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
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#define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_SPLIT (__BLK_TA_SPLIT)
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#define BLK_TA_BOUNCE (__BLK_TA_BOUNCE)
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#define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_IO_TRACE_MAGIC 0x65617400
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#define BLK_IO_TRACE_VERSION 0x07
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/*
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* The trace itself
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*/
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struct blk_io_trace {
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u32 magic; /* MAGIC << 8 | version */
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u32 sequence; /* event number */
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u64 time; /* in microseconds */
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u64 sector; /* disk offset */
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u32 bytes; /* transfer length */
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u32 action; /* what happened */
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u32 pid; /* who did it */
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u32 device; /* device number */
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u32 cpu; /* on what cpu did it happen */
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u16 error; /* completion error */
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u16 pdu_len; /* length of data after this trace */
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};
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/*
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* The remap event
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*/
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struct blk_io_trace_remap {
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__be32 device;
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u32 __pad;
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__be64 sector;
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};
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enum {
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Blktrace_setup = 1,
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Blktrace_running,
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Blktrace_stopped,
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};
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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 *sequence;
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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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atomic_t dropped;
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};
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/*
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* User setup structure passed with BLKTRACESTART
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*/
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struct blk_user_trace_setup {
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char name[BDEVNAME_SIZE]; /* output */
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u16 act_mask; /* input */
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u32 buf_size; /* input */
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u32 buf_nr; /* input */
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u64 start_lba;
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u64 end_lba;
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u32 pid;
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};
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#if defined(CONFIG_BLK_DEV_IO_TRACE)
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extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
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extern void blk_trace_shutdown(request_queue_t *);
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extern void __blk_add_trace(struct blk_trace *, sector_t, int, int, u32, int, int, void *);
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/**
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* blk_add_trace_rq - Add a trace for a request oriented action
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* @q: queue the io is for
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* @rq: the source request
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* @what: the action
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*
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* Description:
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* Records an action against a request. Will log the bio offset + size.
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*
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**/
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static inline void blk_add_trace_rq(struct request_queue *q, struct request *rq,
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u32 what)
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{
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struct blk_trace *bt = q->blk_trace;
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int rw = rq->cmd_flags & 0x03;
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if (likely(!bt))
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return;
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if (blk_pc_request(rq)) {
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what |= BLK_TC_ACT(BLK_TC_PC);
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__blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, sizeof(rq->cmd), rq->cmd);
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} else {
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what |= BLK_TC_ACT(BLK_TC_FS);
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__blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9, rw, what, rq->errors, 0, NULL);
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}
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}
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/**
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* blk_add_trace_bio - Add a trace for a bio oriented action
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* @q: queue the io is for
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* @bio: the source bio
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* @what: the action
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*
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* Description:
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* Records an action against a bio. Will log the bio offset + size.
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*
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**/
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static inline void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
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u32 what)
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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;
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__blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, !bio_flagged(bio, BIO_UPTODATE), 0, NULL);
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}
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/**
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* blk_add_trace_generic - Add a trace for a generic action
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* @q: queue the io is for
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* @bio: the source bio
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* @rw: the data direction
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* @what: the action
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*
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* Description:
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* Records a simple trace
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*
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**/
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static inline void blk_add_trace_generic(struct request_queue *q,
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struct bio *bio, int rw, u32 what)
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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;
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if (bio)
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blk_add_trace_bio(q, bio, what);
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else
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__blk_add_trace(bt, 0, 0, rw, what, 0, 0, NULL);
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}
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/**
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* blk_add_trace_pdu_int - Add a trace for a bio with an integer payload
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* @q: queue the io is for
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* @what: the action
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* @bio: the source bio
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* @pdu: the integer payload
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*
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* Description:
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* Adds a trace with some integer payload. This might be an unplug
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* option given as the action, with the depth at unplug time given
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* as the payload
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*
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**/
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static inline void blk_add_trace_pdu_int(struct request_queue *q, u32 what,
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struct bio *bio, unsigned int pdu)
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{
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struct blk_trace *bt = q->blk_trace;
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__be64 rpdu = cpu_to_be64(pdu);
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if (likely(!bt))
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return;
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if (bio)
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__blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, !bio_flagged(bio, BIO_UPTODATE), sizeof(rpdu), &rpdu);
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else
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__blk_add_trace(bt, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu);
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}
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/**
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* blk_add_trace_remap - Add a trace for a remap operation
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* @q: queue the io is for
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* @bio: the source bio
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* @dev: target device
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* @from: source sector
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* @to: target sector
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*
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* Description:
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* Device mapper or raid target sometimes need to split a bio because
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* it spans a stripe (or similar). Add a trace for that action.
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*
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**/
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static inline void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
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dev_t dev, sector_t from, sector_t to)
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{
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struct blk_trace *bt = q->blk_trace;
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struct blk_io_trace_remap r;
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if (likely(!bt))
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return;
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r.device = cpu_to_be32(dev);
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r.sector = cpu_to_be64(to);
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__blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r);
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}
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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_trace_rq(q, rq, what) do { } while (0)
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#define blk_add_trace_bio(q, rq, what) do { } while (0)
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#define blk_add_trace_generic(q, rq, rw, what) do { } while (0)
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#define blk_add_trace_pdu_int(q, what, bio, pdu) do { } while (0)
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#define blk_add_trace_remap(q, bio, dev, f, t) do {} while (0)
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#endif /* CONFIG_BLK_DEV_IO_TRACE */
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#endif
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