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/* Copyright (c) 2006 Coraid, Inc. See COPYING for GPL terms. */
/*
* aoedev.c
* AoE device utility functions; maintains device list.
*/
#include <linux/hdreg.h>
#include <linux/blkdev.h>
#include <linux/netdevice.h>
#include "aoe.h"
static struct aoedev *devlist;
static spinlock_t devlist_lock;
int
aoedev_isbusy(struct aoedev *d)
{
struct frame *f, *e;
f = d->frames;
e = f + d->nframes;
do {
if (f->tag != FREETAG)
return 1;
} while (++f < e);
return 0;
}
struct aoedev *
aoedev_by_aoeaddr(int maj, int min)
{
struct aoedev *d;
ulong flags;
spin_lock_irqsave(&devlist_lock, flags);
for (d=devlist; d; d=d->next)
if (d->aoemajor == maj && d->aoeminor == min)
break;
spin_unlock_irqrestore(&devlist_lock, flags);
return d;
}
static void
dummy_timer(ulong vp)
{
struct aoedev *d;
d = (struct aoedev *)vp;
if (d->flags & DEVFL_TKILL)
return;
d->timer.expires = jiffies + HZ;
add_timer(&d->timer);
}
/* called with devlist lock held */
static struct aoedev *
aoedev_newdev(ulong nframes)
{
struct aoedev *d;
struct frame *f, *e;
d = kzalloc(sizeof *d, GFP_ATOMIC);
f = kcalloc(nframes, sizeof *f, GFP_ATOMIC);
switch (!d || !f) {
case 0:
d->nframes = nframes;
d->frames = f;
e = f + nframes;
for (; f<e; f++) {
f->tag = FREETAG;
f->skb = new_skb(ETH_ZLEN);
if (!f->skb)
break;
}
if (f == e)
break;
while (f > d->frames) {
f--;
dev_kfree_skb(f->skb);
}
default:
if (f)
kfree(f);
if (d)
kfree(d);
return NULL;
}
INIT_WORK(&d->work, aoecmd_sleepwork);
spin_lock_init(&d->lock);
init_timer(&d->timer);
d->timer.data = (ulong) d;
d->timer.function = dummy_timer;
d->timer.expires = jiffies + HZ;
add_timer(&d->timer);
d->bufpool = NULL; /* defer to aoeblk_gdalloc */
INIT_LIST_HEAD(&d->bufq);
d->next = devlist;
devlist = d;
return d;
}
void
aoedev_downdev(struct aoedev *d)
{
struct frame *f, *e;
struct buf *buf;
struct bio *bio;
f = d->frames;
e = f + d->nframes;
for (; f<e; f->tag = FREETAG, f->buf = NULL, f++) {
if (f->tag == FREETAG || f->buf == NULL)
continue;
buf = f->buf;
bio = buf->bio;
if (--buf->nframesout == 0) {
mempool_free(buf, d->bufpool);
bio_endio(bio, -EIO);
}
skb_shinfo(f->skb)->nr_frags = f->skb->data_len = 0;
}
d->inprocess = NULL;
while (!list_empty(&d->bufq)) {
buf = container_of(d->bufq.next, struct buf, bufs);
list_del(d->bufq.next);
bio = buf->bio;
mempool_free(buf, d->bufpool);
bio_endio(bio, -EIO);
}
if (d->gd)
d->gd->capacity = 0;
d->flags &= ~(DEVFL_UP | DEVFL_PAUSE);
}
/* find it or malloc it */
struct aoedev *
aoedev_by_sysminor_m(ulong sysminor, ulong bufcnt)
{
struct aoedev *d;
ulong flags;
spin_lock_irqsave(&devlist_lock, flags);
for (d=devlist; d; d=d->next)
if (d->sysminor == sysminor)
break;
if (d == NULL) {
d = aoedev_newdev(bufcnt);
if (d == NULL) {
spin_unlock_irqrestore(&devlist_lock, flags);
printk(KERN_INFO "aoe: aoedev_newdev failure.\n");
return NULL;
}
d->sysminor = sysminor;
d->aoemajor = AOEMAJOR(sysminor);
d->aoeminor = AOEMINOR(sysminor);
}
spin_unlock_irqrestore(&devlist_lock, flags);
return d;
}
static void
aoedev_freedev(struct aoedev *d)
{
struct frame *f, *e;
if (d->gd) {
aoedisk_rm_sysfs(d);
del_gendisk(d->gd);
put_disk(d->gd);
}
f = d->frames;
e = f + d->nframes;
for (; f<e; f++) {
skb_shinfo(f->skb)->nr_frags = 0;
dev_kfree_skb(f->skb);
}
kfree(d->frames);
if (d->bufpool)
mempool_destroy(d->bufpool);
kfree(d);
}
void
aoedev_exit(void)
{
struct aoedev *d;
ulong flags;
flush_scheduled_work();
while ((d = devlist)) {
devlist = d->next;
spin_lock_irqsave(&d->lock, flags);
aoedev_downdev(d);
d->flags |= DEVFL_TKILL;
spin_unlock_irqrestore(&d->lock, flags);
del_timer_sync(&d->timer);
aoedev_freedev(d);
}
}
int __init
aoedev_init(void)
{
spin_lock_init(&devlist_lock);
return 0;
}
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