-/* Copyright (c) 2004 Coraid, Inc. See COPYING for GPL terms. */
+/* Copyright (c) 2007 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 <linux/delay.h>
#include "aoe.h"
+static void dummy_timer(ulong);
+static void aoedev_freedev(struct aoedev *);
+static void freetgt(struct aoedev *d, struct aoetgt *t);
+static void skbpoolfree(struct aoedev *d);
+
static struct aoedev *devlist;
-static spinlock_t devlist_lock;
+static DEFINE_SPINLOCK(devlist_lock);
struct aoedev *
aoedev_by_aoeaddr(int maj, int min)
return d;
}
-/* called with devlist lock held */
-static struct aoedev *
-aoedev_newdev(ulong nframes)
+static void
+dummy_timer(ulong vp)
{
struct aoedev *d;
- struct frame *f, *e;
-
- d = kcalloc(1, sizeof *d, GFP_ATOMIC);
- if (d == NULL)
- return NULL;
- f = kcalloc(nframes, sizeof *f, GFP_ATOMIC);
- if (f == NULL) {
- kfree(d);
- return NULL;
- }
-
- d->nframes = nframes;
- d->frames = f;
- e = f + nframes;
- for (; f<e; f++)
- f->tag = FREETAG;
-
- spin_lock_init(&d->lock);
- init_timer(&d->timer);
- d->bufpool = NULL; /* defer to aoeblk_gdalloc */
- INIT_LIST_HEAD(&d->bufq);
- d->next = devlist;
- devlist = d;
- return d;
+ d = (struct aoedev *)vp;
+ if (d->flags & DEVFL_TKILL)
+ return;
+ d->timer.expires = jiffies + HZ;
+ add_timer(&d->timer);
}
void
aoedev_downdev(struct aoedev *d)
{
+ struct aoetgt **t, **te;
struct frame *f, *e;
struct buf *buf;
struct bio *bio;
- d->flags |= DEVFL_TKILL;
- del_timer(&d->timer);
-
- 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, bio->bi_size, -EIO);
+ t = d->targets;
+ te = t + NTARGETS;
+ for (; t < te && *t; t++) {
+ f = (*t)->frames;
+ e = f + (*t)->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
+ && buf != d->inprocess) {
+ mempool_free(buf, d->bufpool);
+ bio_endio(bio, -EIO);
+ }
}
+ (*t)->maxout = (*t)->nframes;
+ (*t)->nout = 0;
+ }
+ buf = d->inprocess;
+ if (buf) {
+ bio = buf->bio;
+ mempool_free(buf, d->bufpool);
+ bio_endio(bio, -EIO);
}
d->inprocess = NULL;
+ d->htgt = 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, bio->bi_size, -EIO);
+ bio_endio(bio, -EIO);
}
- if (d->nopen)
- d->flags |= DEVFL_CLOSEWAIT;
if (d->gd)
- d->gd->capacity = 0;
+ set_capacity(d->gd, 0);
d->flags &= ~DEVFL_UP;
}
-struct aoedev *
-aoedev_set(ulong sysminor, unsigned char *addr, struct net_device *ifp, ulong bufcnt)
+static void
+aoedev_freedev(struct aoedev *d)
+{
+ struct aoetgt **t, **e;
+
+ if (d->gd) {
+ aoedisk_rm_sysfs(d);
+ del_gendisk(d->gd);
+ put_disk(d->gd);
+ }
+ t = d->targets;
+ e = t + NTARGETS;
+ for (; t < e && *t; t++)
+ freetgt(d, *t);
+ if (d->bufpool)
+ mempool_destroy(d->bufpool);
+ skbpoolfree(d);
+ kfree(d);
+}
+
+int
+aoedev_flush(const char __user *str, size_t cnt)
{
- struct aoedev *d;
ulong flags;
+ struct aoedev *d, **dd;
+ struct aoedev *rmd = NULL;
+ char buf[16];
+ int all = 0;
+
+ if (cnt >= 3) {
+ if (cnt > sizeof buf)
+ cnt = sizeof buf;
+ if (copy_from_user(buf, str, cnt))
+ return -EFAULT;
+ all = !strncmp(buf, "all", 3);
+ }
+ flush_scheduled_work();
spin_lock_irqsave(&devlist_lock, flags);
+ dd = &devlist;
+ while ((d = *dd)) {
+ spin_lock(&d->lock);
+ if ((!all && (d->flags & DEVFL_UP))
+ || (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE))
+ || d->nopen) {
+ spin_unlock(&d->lock);
+ dd = &d->next;
+ continue;
+ }
+ *dd = d->next;
+ aoedev_downdev(d);
+ d->flags |= DEVFL_TKILL;
+ spin_unlock(&d->lock);
+ d->next = rmd;
+ rmd = d;
+ }
+ spin_unlock_irqrestore(&devlist_lock, flags);
+ while ((d = rmd)) {
+ rmd = d->next;
+ del_timer_sync(&d->timer);
+ aoedev_freedev(d); /* must be able to sleep */
+ }
+ return 0;
+}
- for (d=devlist; d; d=d->next)
- if (d->sysminor == sysminor
- || memcmp(d->addr, addr, sizeof d->addr) == 0)
- break;
-
- if (d == NULL && (d = aoedev_newdev(bufcnt)) == NULL) {
- spin_unlock_irqrestore(&devlist_lock, flags);
- printk(KERN_INFO "aoe: aoedev_set: aoedev_newdev failure.\n");
- return NULL;
+/* I'm not really sure that this is a realistic problem, but if the
+network driver goes gonzo let's just leak memory after complaining. */
+static void
+skbfree(struct sk_buff *skb)
+{
+ enum { Sms = 100, Tms = 3*1000};
+ int i = Tms / Sms;
+
+ if (skb == NULL)
+ return;
+ while (atomic_read(&skb_shinfo(skb)->dataref) != 1 && i-- > 0)
+ msleep(Sms);
+ if (i < 0) {
+ printk(KERN_ERR
+ "aoe: %s holds ref: %s\n",
+ skb->dev ? skb->dev->name : "netif",
+ "cannot free skb -- memory leaked.");
+ return;
}
+ skb_shinfo(skb)->nr_frags = skb->data_len = 0;
+ skb_trim(skb, 0);
+ dev_kfree_skb(skb);
+}
- spin_unlock_irqrestore(&devlist_lock, flags);
- spin_lock_irqsave(&d->lock, flags);
+static void
+skbpoolfree(struct aoedev *d)
+{
+ struct sk_buff *skb, *tmp;
- d->ifp = ifp;
+ skb_queue_walk_safe(&d->skbpool, skb, tmp)
+ skbfree(skb);
- if (d->sysminor != sysminor
- || (d->flags & DEVFL_UP) == 0) {
- aoedev_downdev(d); /* flushes outstanding frames */
- memcpy(d->addr, addr, sizeof d->addr);
- d->sysminor = sysminor;
- d->aoemajor = AOEMAJOR(sysminor);
- d->aoeminor = AOEMINOR(sysminor);
- }
+ __skb_queue_head_init(&d->skbpool);
+}
+
+/* find it or malloc it */
+struct aoedev *
+aoedev_by_sysminor_m(ulong sysminor)
+{
+ struct aoedev *d;
+ ulong flags;
+
+ spin_lock_irqsave(&devlist_lock, flags);
- spin_unlock_irqrestore(&d->lock, flags);
+ for (d=devlist; d; d=d->next)
+ if (d->sysminor == sysminor)
+ break;
+ if (d)
+ goto out;
+ d = kcalloc(1, sizeof *d, GFP_ATOMIC);
+ if (!d)
+ goto out;
+ INIT_WORK(&d->work, aoecmd_sleepwork);
+ spin_lock_init(&d->lock);
+ skb_queue_head_init(&d->sendq);
+ skb_queue_head_init(&d->skbpool);
+ 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 */
+ d->tgt = d->targets;
+ INIT_LIST_HEAD(&d->bufq);
+ d->sysminor = sysminor;
+ d->aoemajor = AOEMAJOR(sysminor);
+ d->aoeminor = AOEMINOR(sysminor);
+ d->mintimer = MINTIMER;
+ d->next = devlist;
+ devlist = d;
+ out:
+ spin_unlock_irqrestore(&devlist_lock, flags);
return d;
}
static void
-aoedev_freedev(struct aoedev *d)
+freetgt(struct aoedev *d, struct aoetgt *t)
{
- if (d->gd) {
- aoedisk_rm_sysfs(d);
- del_gendisk(d->gd);
- put_disk(d->gd);
- }
- kfree(d->frames);
- if (d->bufpool)
- mempool_destroy(d->bufpool);
- kfree(d);
+ struct frame *f, *e;
+
+ f = t->frames;
+ e = f + t->nframes;
+ for (; f < e; f++)
+ skbfree(f->skb);
+ kfree(t->frames);
+ kfree(t);
}
void
spin_lock_irqsave(&d->lock, flags);
aoedev_downdev(d);
+ d->flags |= DEVFL_TKILL;
spin_unlock_irqrestore(&d->lock, flags);
del_timer_sync(&d->timer);
int __init
aoedev_init(void)
{
- spin_lock_init(&devlist_lock);
return 0;
}
-
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff