178 lines
3.3 KiB
C
178 lines
3.3 KiB
C
/* Copyright (c) 2004 Coraid, Inc. See COPYING for GPL terms. */
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/*
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* aoedev.c
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* AoE device utility functions; maintains device list.
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*/
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#include <linux/hdreg.h>
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#include <linux/blkdev.h>
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#include <linux/netdevice.h>
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#include "aoe.h"
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static struct aoedev *devlist;
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static spinlock_t devlist_lock;
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struct aoedev *
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aoedev_by_aoeaddr(int maj, int min)
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{
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struct aoedev *d;
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ulong flags;
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spin_lock_irqsave(&devlist_lock, flags);
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for (d=devlist; d; d=d->next)
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if (d->aoemajor == maj && d->aoeminor == min)
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break;
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spin_unlock_irqrestore(&devlist_lock, flags);
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return d;
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}
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/* called with devlist lock held */
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static struct aoedev *
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aoedev_newdev(ulong nframes)
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{
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struct aoedev *d;
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struct frame *f, *e;
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d = kcalloc(1, sizeof *d, GFP_ATOMIC);
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if (d == NULL)
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return NULL;
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f = kcalloc(nframes, sizeof *f, GFP_ATOMIC);
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if (f == NULL) {
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kfree(d);
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return NULL;
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}
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d->nframes = nframes;
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d->frames = f;
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e = f + nframes;
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for (; f<e; f++)
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f->tag = FREETAG;
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spin_lock_init(&d->lock);
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init_timer(&d->timer);
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d->bufpool = NULL; /* defer to aoeblk_gdalloc */
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INIT_LIST_HEAD(&d->bufq);
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d->next = devlist;
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devlist = d;
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return d;
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}
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void
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aoedev_downdev(struct aoedev *d)
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{
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struct frame *f, *e;
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struct buf *buf;
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struct bio *bio;
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d->flags |= DEVFL_TKILL;
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del_timer(&d->timer);
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f = d->frames;
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e = f + d->nframes;
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for (; f<e; f->tag = FREETAG, f->buf = NULL, f++) {
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if (f->tag == FREETAG || f->buf == NULL)
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continue;
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buf = f->buf;
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bio = buf->bio;
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if (--buf->nframesout == 0) {
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mempool_free(buf, d->bufpool);
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bio_endio(bio, bio->bi_size, -EIO);
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}
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}
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d->inprocess = NULL;
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while (!list_empty(&d->bufq)) {
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buf = container_of(d->bufq.next, struct buf, bufs);
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list_del(d->bufq.next);
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bio = buf->bio;
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mempool_free(buf, d->bufpool);
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bio_endio(bio, bio->bi_size, -EIO);
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}
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if (d->nopen)
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d->flags |= DEVFL_CLOSEWAIT;
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if (d->gd)
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d->gd->capacity = 0;
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d->flags &= ~DEVFL_UP;
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}
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struct aoedev *
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aoedev_set(ulong sysminor, unsigned char *addr, struct net_device *ifp, ulong bufcnt)
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{
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struct aoedev *d;
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ulong flags;
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spin_lock_irqsave(&devlist_lock, flags);
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for (d=devlist; d; d=d->next)
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if (d->sysminor == sysminor)
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break;
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if (d == NULL && (d = aoedev_newdev(bufcnt)) == NULL) {
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spin_unlock_irqrestore(&devlist_lock, flags);
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printk(KERN_INFO "aoe: aoedev_set: aoedev_newdev failure.\n");
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return NULL;
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} /* if newdev, (d->flags & DEVFL_UP) == 0 for below */
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spin_unlock_irqrestore(&devlist_lock, flags);
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spin_lock_irqsave(&d->lock, flags);
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d->ifp = ifp;
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memcpy(d->addr, addr, sizeof d->addr);
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if ((d->flags & DEVFL_UP) == 0) {
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aoedev_downdev(d); /* flushes outstanding frames */
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d->sysminor = sysminor;
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d->aoemajor = AOEMAJOR(sysminor);
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d->aoeminor = AOEMINOR(sysminor);
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}
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spin_unlock_irqrestore(&d->lock, flags);
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return d;
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}
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static void
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aoedev_freedev(struct aoedev *d)
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{
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if (d->gd) {
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aoedisk_rm_sysfs(d);
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del_gendisk(d->gd);
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put_disk(d->gd);
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}
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kfree(d->frames);
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if (d->bufpool)
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mempool_destroy(d->bufpool);
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kfree(d);
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}
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void
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aoedev_exit(void)
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{
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struct aoedev *d;
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ulong flags;
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flush_scheduled_work();
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while ((d = devlist)) {
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devlist = d->next;
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spin_lock_irqsave(&d->lock, flags);
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aoedev_downdev(d);
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spin_unlock_irqrestore(&d->lock, flags);
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del_timer_sync(&d->timer);
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aoedev_freedev(d);
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}
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}
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int __init
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aoedev_init(void)
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{
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spin_lock_init(&devlist_lock);
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return 0;
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}
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