From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 drivers/block/aoe/aoedev.c | 180 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 180 insertions(+)
 create mode 100644 drivers/block/aoe/aoedev.c

(limited to 'drivers/block/aoe/aoedev.c')

diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
new file mode 100644
index 00000000000..240abaec159
--- /dev/null
+++ b/drivers/block/aoe/aoedev.c
@@ -0,0 +1,180 @@
+/* Copyright (c) 2004 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;
+
+struct aoedev *
+aoedev_bymac(unsigned char *macaddr)
+{
+	struct aoedev *d;
+	ulong flags;
+
+	spin_lock_irqsave(&devlist_lock, flags);
+
+	for (d=devlist; d; d=d->next)
+		if (!memcmp(d->addr, macaddr, 6))
+			break;
+
+	spin_unlock_irqrestore(&devlist_lock, flags);
+	return d;
+}
+
+/* called with devlist lock held */
+static struct aoedev *
+aoedev_newdev(ulong nframes)
+{
+	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;
+}
+
+void
+aoedev_downdev(struct aoedev *d)
+{
+	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);
+		}
+	}
+	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, bio->bi_size, -EIO);
+	}
+
+	if (d->nopen)
+		d->flags |= DEVFL_CLOSEWAIT;
+	if (d->gd)
+		d->gd->capacity = 0;
+
+	d->flags &= ~DEVFL_UP;
+}
+
+struct aoedev *
+aoedev_set(ulong sysminor, unsigned char *addr, struct net_device *ifp, ulong bufcnt)
+{
+	struct aoedev *d;
+	ulong flags;
+
+	spin_lock_irqsave(&devlist_lock, flags);
+
+	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;
+	}
+
+	spin_unlock_irqrestore(&devlist_lock, flags);
+	spin_lock_irqsave(&d->lock, flags);
+
+	d->ifp = ifp;
+
+	if (d->sysminor != sysminor
+	|| memcmp(d->addr, addr, sizeof d->addr)
+	|| (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);
+	}
+
+	spin_unlock_irqrestore(&d->lock, flags);
+	return d;
+}
+
+static void
+aoedev_freedev(struct aoedev *d)
+{
+	if (d->gd) {
+		aoedisk_rm_sysfs(d);
+		del_gendisk(d->gd);
+		put_disk(d->gd);
+	}
+	kfree(d->frames);
+	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);
+		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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