1 files changed, 331 insertions, 0 deletions
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
new file mode 100644
index 00000000..321de7b6
--- /dev/null
+++ b/drivers/block/aoe/aoeblk.c
@@ -0,0 +1,331 @@
+/* Copyright (c) 2007 Coraid, Inc.  See COPYING for GPL terms. */
+/*
+ * aoeblk.c
+ * block device routines
+ */
+
+#include <linux/kernel.h>
+#include <linux/hdreg.h>
+#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
+#include <linux/fs.h>
+#include <linux/ioctl.h>
+#include <linux/slab.h>
+#include <linux/ratelimit.h>
+#include <linux/genhd.h>
+#include <linux/netdevice.h>
+#include <linux/mutex.h>
+#include <linux/export.h>
+#include "aoe.h"
+
+static DEFINE_MUTEX(aoeblk_mutex);
+static struct kmem_cache *buf_pool_cache;
+
+static ssize_t aoedisk_show_state(struct device *dev,
+				  struct device_attribute *attr, char *page)
+{
+	struct gendisk *disk = dev_to_disk(dev);
+	struct aoedev *d = disk->private_data;
+
+	return snprintf(page, PAGE_SIZE,
+			"%s%s\n",
+			(d->flags & DEVFL_UP) ? "up" : "down",
+			(d->flags & DEVFL_KICKME) ? ",kickme" :
+			(d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
+	/* I'd rather see nopen exported so we can ditch closewait */
+}
+static ssize_t aoedisk_show_mac(struct device *dev,
+				struct device_attribute *attr, char *page)
+{
+	struct gendisk *disk = dev_to_disk(dev);
+	struct aoedev *d = disk->private_data;
+	struct aoetgt *t = d->targets[0];
+
+	if (t == NULL)
+		return snprintf(page, PAGE_SIZE, "none\n");
+	return snprintf(page, PAGE_SIZE, "%pm\n", t->addr);
+}
+static ssize_t aoedisk_show_netif(struct device *dev,
+				  struct device_attribute *attr, char *page)
+{
+	struct gendisk *disk = dev_to_disk(dev);
+	struct aoedev *d = disk->private_data;
+	struct net_device *nds[8], **nd, **nnd, **ne;
+	struct aoetgt **t, **te;
+	struct aoeif *ifp, *e;
+	char *p;
+
+	memset(nds, 0, sizeof nds);
+	nd = nds;
+	ne = nd + ARRAY_SIZE(nds);
+	t = d->targets;
+	te = t + NTARGETS;
+	for (; t < te && *t; t++) {
+		ifp = (*t)->ifs;
+		e = ifp + NAOEIFS;
+		for (; ifp < e && ifp->nd; ifp++) {
+			for (nnd = nds; nnd < nd; nnd++)
+				if (*nnd == ifp->nd)
+					break;
+			if (nnd == nd && nd != ne)
+				*nd++ = ifp->nd;
+		}
+	}
+
+	ne = nd;
+	nd = nds;
+	if (*nd == NULL)
+		return snprintf(page, PAGE_SIZE, "none\n");
+	for (p = page; nd < ne; nd++)
+		p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
+			p == page ? "" : ",", (*nd)->name);
+	p += snprintf(p, PAGE_SIZE - (p-page), "\n");
+	return p-page;
+}
+/* firmware version */
+static ssize_t aoedisk_show_fwver(struct device *dev,
+				  struct device_attribute *attr, char *page)
+{
+	struct gendisk *disk = dev_to_disk(dev);
+	struct aoedev *d = disk->private_data;
+
+	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
+}
+
+static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
+static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
+static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
+static struct device_attribute dev_attr_firmware_version = {
+	.attr = { .name = "firmware-version", .mode = S_IRUGO },
+	.show = aoedisk_show_fwver,
+};
+
+static struct attribute *aoe_attrs[] = {
+	&dev_attr_state.attr,
+	&dev_attr_mac.attr,
+	&dev_attr_netif.attr,
+	&dev_attr_firmware_version.attr,
+	NULL,
+};
+
+static const struct attribute_group attr_group = {
+	.attrs = aoe_attrs,
+};
+
+static int
+aoedisk_add_sysfs(struct aoedev *d)
+{
+	return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
+}
+void
+aoedisk_rm_sysfs(struct aoedev *d)
+{
+	sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
+}
+
+static int
+aoeblk_open(struct block_device *bdev, fmode_t mode)
+{
+	struct aoedev *d = bdev->bd_disk->private_data;
+	ulong flags;
+
+	mutex_lock(&aoeblk_mutex);
+	spin_lock_irqsave(&d->lock, flags);
+	if (d->flags & DEVFL_UP) {
+		d->nopen++;
+		spin_unlock_irqrestore(&d->lock, flags);
+		mutex_unlock(&aoeblk_mutex);
+		return 0;
+	}
+	spin_unlock_irqrestore(&d->lock, flags);
+	mutex_unlock(&aoeblk_mutex);
+	return -ENODEV;
+}
+
+static int
+aoeblk_release(struct gendisk *disk, fmode_t mode)
+{
+	struct aoedev *d = disk->private_data;
+	ulong flags;
+
+	spin_lock_irqsave(&d->lock, flags);
+
+	if (--d->nopen == 0) {
+		spin_unlock_irqrestore(&d->lock, flags);
+		aoecmd_cfg(d->aoemajor, d->aoeminor);
+		return 0;
+	}
+	spin_unlock_irqrestore(&d->lock, flags);
+
+	return 0;
+}
+
+static void
+aoeblk_make_request(struct request_queue *q, struct bio *bio)
+{
+	struct sk_buff_head queue;
+	struct aoedev *d;
+	struct buf *buf;
+	ulong flags;
+
+	blk_queue_bounce(q, &bio);
+
+	if (bio == NULL) {
+		printk(KERN_ERR "aoe: bio is NULL\n");
+		BUG();
+		return;
+	}
+	d = bio->bi_bdev->bd_disk->private_data;
+	if (d == NULL) {
+		printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n");
+		BUG();
+		bio_endio(bio, -ENXIO);
+		return;
+	} else if (bio->bi_io_vec == NULL) {
+		printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
+		BUG();
+		bio_endio(bio, -ENXIO);
+		return;
+	}
+	buf = mempool_alloc(d->bufpool, GFP_NOIO);
+	if (buf == NULL) {
+		printk(KERN_INFO "aoe: buf allocation failure\n");
+		bio_endio(bio, -ENOMEM);
+		return;
+	}
+	memset(buf, 0, sizeof(*buf));
+	INIT_LIST_HEAD(&buf->bufs);
+	buf->stime = jiffies;
+	buf->bio = bio;
+	buf->resid = bio->bi_size;
+	buf->sector = bio->bi_sector;
+	buf->bv = &bio->bi_io_vec[bio->bi_idx];
+	buf->bv_resid = buf->bv->bv_len;
+	WARN_ON(buf->bv_resid == 0);
+	buf->bv_off = buf->bv->bv_offset;
+
+	spin_lock_irqsave(&d->lock, flags);
+
+	if ((d->flags & DEVFL_UP) == 0) {
+		pr_info_ratelimited("aoe: device %ld.%d is not up\n",
+			d->aoemajor, d->aoeminor);
+		spin_unlock_irqrestore(&d->lock, flags);
+		mempool_free(buf, d->bufpool);
+		bio_endio(bio, -ENXIO);
+		return;
+	}
+
+	list_add_tail(&buf->bufs, &d->bufq);
+
+	aoecmd_work(d);
+	__skb_queue_head_init(&queue);
+	skb_queue_splice_init(&d->sendq, &queue);
+
+	spin_unlock_irqrestore(&d->lock, flags);
+	aoenet_xmit(&queue);
+}
+
+static int
+aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+	struct aoedev *d = bdev->bd_disk->private_data;
+
+	if ((d->flags & DEVFL_UP) == 0) {
+		printk(KERN_ERR "aoe: disk not up\n");
+		return -ENODEV;
+	}
+
+	geo->cylinders = d->geo.cylinders;
+	geo->heads = d->geo.heads;
+	geo->sectors = d->geo.sectors;
+	return 0;
+}
+
+static const struct block_device_operations aoe_bdops = {
+	.open = aoeblk_open,
+	.release = aoeblk_release,
+	.getgeo = aoeblk_getgeo,
+	.owner = THIS_MODULE,
+};
+
+/* alloc_disk and add_disk can sleep */
+void
+aoeblk_gdalloc(void *vp)
+{
+	struct aoedev *d = vp;
+	struct gendisk *gd;
+	ulong flags;
+
+	gd = alloc_disk(AOE_PARTITIONS);
+	if (gd == NULL) {
+		printk(KERN_ERR
+			"aoe: cannot allocate disk structure for %ld.%d\n",
+			d->aoemajor, d->aoeminor);
+		goto err;
+	}
+
+	d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
+	if (d->bufpool == NULL) {
+		printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
+			d->aoemajor, d->aoeminor);
+		goto err_disk;
+	}
+
+	d->blkq = blk_alloc_queue(GFP_KERNEL);
+	if (!d->blkq)
+		goto err_mempool;
+	blk_queue_make_request(d->blkq, aoeblk_make_request);
+	d->blkq->backing_dev_info.name = "aoe";
+	if (bdi_init(&d->blkq->backing_dev_info))
+		goto err_blkq;
+	spin_lock_irqsave(&d->lock, flags);
+	gd->major = AOE_MAJOR;
+	gd->first_minor = d->sysminor * AOE_PARTITIONS;
+	gd->fops = &aoe_bdops;
+	gd->private_data = d;
+	set_capacity(gd, d->ssize);
+	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
+		d->aoemajor, d->aoeminor);
+
+	gd->queue = d->blkq;
+	d->gd = gd;
+	d->flags &= ~DEVFL_GDALLOC;
+	d->flags |= DEVFL_UP;
+
+	spin_unlock_irqrestore(&d->lock, flags);
+
+	add_disk(gd);
+	aoedisk_add_sysfs(d);
+	return;
+
+err_blkq:
+	blk_cleanup_queue(d->blkq);
+	d->blkq = NULL;
+err_mempool:
+	mempool_destroy(d->bufpool);
+err_disk:
+	put_disk(gd);
+err:
+	spin_lock_irqsave(&d->lock, flags);
+	d->flags &= ~DEVFL_GDALLOC;
+	spin_unlock_irqrestore(&d->lock, flags);
+}
+
+void
+aoeblk_exit(void)
+{
+	kmem_cache_destroy(buf_pool_cache);
+}
+
+int __init
+aoeblk_init(void)
+{
+	buf_pool_cache = kmem_cache_create("aoe_bufs",
+					   sizeof(struct buf),
+					   0, 0, NULL);
+	if (buf_pool_cache == NULL)
+		return -ENOMEM;
+
+	return 0;
+}
+