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197 lines
4.8 KiB
C
197 lines
4.8 KiB
C
/*-
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_geom.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/conf.h>
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#include <sys/disk.h>
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#include <geom/geom_disk.h>
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/*-
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* Disk error is the preface to plaintive error messages
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* about failing disk transfers. It prints messages of the form
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* "hp0g: BLABLABLA cmd=read fsbn 12345 of 12344-12347"
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* blkdone should be -1 if the position of the error is unknown.
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* The message is printed with printf.
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*/
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void
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disk_err(struct bio *bp, const char *what, int blkdone, int nl)
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{
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daddr_t sn;
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if (bp->bio_dev != NULL)
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printf("%s: %s ", devtoname(bp->bio_dev), what);
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else if (bp->bio_disk != NULL)
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printf("%s%d: %s ",
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bp->bio_disk->d_name, bp->bio_disk->d_unit, what);
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else
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printf("disk??: %s ", what);
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switch(bp->bio_cmd) {
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case BIO_READ: printf("cmd=read "); break;
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case BIO_WRITE: printf("cmd=write "); break;
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case BIO_DELETE: printf("cmd=delete "); break;
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case BIO_GETATTR: printf("cmd=getattr "); break;
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default: printf("cmd=%x ", bp->bio_cmd); break;
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}
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sn = bp->bio_pblkno;
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if (bp->bio_bcount <= DEV_BSIZE) {
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printf("fsbn %jd%s", (intmax_t)sn, nl ? "\n" : "");
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return;
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}
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if (blkdone >= 0) {
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sn += blkdone;
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printf("fsbn %jd of ", (intmax_t)sn);
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}
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printf("%jd-%jd", (intmax_t)bp->bio_pblkno,
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(intmax_t)(bp->bio_pblkno + (bp->bio_bcount - 1) / DEV_BSIZE));
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if (nl)
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printf("\n");
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}
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/*
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* BIO queue implementation
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*/
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void
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bioq_init(struct bio_queue_head *head)
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{
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TAILQ_INIT(&head->queue);
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head->last_offset = 0;
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head->insert_point = NULL;
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}
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void
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bioq_remove(struct bio_queue_head *head, struct bio *bp)
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{
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if (bp == head->insert_point) {
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head->last_offset = bp->bio_offset;
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head->insert_point = TAILQ_NEXT(bp, bio_queue);
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if (head->insert_point == NULL) {
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head->last_offset = 0;
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head->insert_point = TAILQ_FIRST(&head->queue);
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}
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}
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TAILQ_REMOVE(&head->queue, bp, bio_queue);
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}
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void
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bioq_flush(struct bio_queue_head *head, struct devstat *stp, int error)
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{
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struct bio *bp;
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while ((bp = bioq_takefirst(head)) != NULL)
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biofinish(bp, stp, error);
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}
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void
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bioq_insert_head(struct bio_queue_head *head, struct bio *bp)
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{
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if (TAILQ_EMPTY(&head->queue))
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head->insert_point = bp;
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TAILQ_INSERT_HEAD(&head->queue, bp, bio_queue);
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}
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void
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bioq_insert_tail(struct bio_queue_head *head, struct bio *bp)
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{
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if (TAILQ_EMPTY(&head->queue))
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head->insert_point = bp;
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TAILQ_INSERT_TAIL(&head->queue, bp, bio_queue);
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}
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struct bio *
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bioq_first(struct bio_queue_head *head)
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{
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return (TAILQ_FIRST(&head->queue));
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}
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struct bio *
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bioq_takefirst(struct bio_queue_head *head)
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{
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struct bio *bp;
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bp = TAILQ_FIRST(&head->queue);
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if (bp != NULL)
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bioq_remove(head, bp);
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return (bp);
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}
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/*
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* Seek sort for disks.
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*
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* The disksort algorithm sorts all requests in a single queue while keeping
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* track of the current position of the disk with insert_point and
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* last_offset. last_offset is the offset of the last block sent to disk, or
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* 0 once we reach the end. insert_point points to the first buf after
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* last_offset, and is used to slightly speed up insertions. Blocks are
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* always sorted in ascending order and the queue always restarts at 0.
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* This implements the one-way scan which optimizes disk seek times.
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*/
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void
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bioq_disksort(bioq, bp)
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struct bio_queue_head *bioq;
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struct bio *bp;
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{
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struct bio *bq;
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struct bio *bn;
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/*
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* If the queue is empty then it's easy.
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*/
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if (bioq_first(bioq) == NULL) {
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bioq_insert_tail(bioq, bp);
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return;
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}
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/*
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* Optimize for sequential I/O by seeing if we go at the tail.
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*/
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bq = TAILQ_LAST(&bioq->queue, bio_queue);
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if (bp->bio_offset > bq->bio_offset) {
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TAILQ_INSERT_AFTER(&bioq->queue, bq, bp, bio_queue);
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return;
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}
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/*
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* Pick our scan start based on the last request. A poor man's
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* binary search.
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*/
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if (bp->bio_offset >= bioq->last_offset) {
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bq = bioq->insert_point;
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/*
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* If we're before the next bio and after the last offset,
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* update insert_point;
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*/
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if (bp->bio_offset < bq->bio_offset) {
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bioq->insert_point = bp;
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TAILQ_INSERT_BEFORE(bq, bp, bio_queue);
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return;
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}
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} else
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bq = TAILQ_FIRST(&bioq->queue);
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if (bp->bio_offset < bq->bio_offset) {
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TAILQ_INSERT_BEFORE(bq, bp, bio_queue);
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return;
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}
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/* Insertion sort */
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while ((bn = TAILQ_NEXT(bq, bio_queue)) != NULL) {
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if (bp->bio_offset < bn->bio_offset)
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break;
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bq = bn;
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}
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TAILQ_INSERT_AFTER(&bioq->queue, bq, bp, bio_queue);
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}
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