aoeblk.c revision e9bb8fb0b6d61a822201537b25206a0ca34b9d1d
152e112b3ab6b2b35a144565c8ea3bdda1e2845f2Ed L. Cashin/* Copyright (c) 2007 Coraid, Inc.  See COPYING for GPL terms. */
21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*
31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * aoeblk.c
41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * block device routines
51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */
61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/hdreg.h>
81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/blkdev.h>
943cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton#include <linux/backing-dev.h>
101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/fs.h>
111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/ioctl.h>
121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/genhd.h>
131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/netdevice.h>
141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "aoe.h"
151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
16e18b890bb0881bbab6f4f1a6cd20d9c60d66b003Christoph Lameterstatic struct kmem_cache *buf_pool_cache;
171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
18edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic ssize_t aoedisk_show_state(struct device *dev,
19edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers				  struct device_attribute *attr, char *page)
201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
21edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	struct gendisk *disk = dev_to_disk(dev);
221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d = disk->private_data;
231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	return snprintf(page, PAGE_SIZE,
251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds			"%s%s\n",
261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds			(d->flags & DEVFL_UP) ? "up" : "down",
2768e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin			(d->flags & DEVFL_KICKME) ? ",kickme" :
283ae1c24e395b2b65326439622223d88d92bfa03aEd L. Cashin			(d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
293ae1c24e395b2b65326439622223d88d92bfa03aEd L. Cashin	/* I'd rather see nopen exported so we can ditch closewait */
301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
31edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic ssize_t aoedisk_show_mac(struct device *dev,
32edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers				struct device_attribute *attr, char *page)
331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
34edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	struct gendisk *disk = dev_to_disk(dev);
351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d = disk->private_data;
3668e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	struct aoetgt *t = d->targets[0];
371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
3868e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	if (t == NULL)
3968e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		return snprintf(page, PAGE_SIZE, "none\n");
401eb0da4cea28ae8f1bbe61822a2cc04e6d074e03Ed L. Cashin	return snprintf(page, PAGE_SIZE, "%012llx\n", mac_addr(t->addr));
411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
42edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic ssize_t aoedisk_show_netif(struct device *dev,
43edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers				  struct device_attribute *attr, char *page)
441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
45edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	struct gendisk *disk = dev_to_disk(dev);
461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d = disk->private_data;
4768e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	struct net_device *nds[8], **nd, **nnd, **ne;
4868e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	struct aoetgt **t, **te;
4968e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	struct aoeif *ifp, *e;
5068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	char *p;
5168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin
5268e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	memset(nds, 0, sizeof nds);
5368e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	nd = nds;
5468e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	ne = nd + ARRAY_SIZE(nds);
5568e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	t = d->targets;
5668e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	te = t + NTARGETS;
5768e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	for (; t < te && *t; t++) {
5868e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		ifp = (*t)->ifs;
5968e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		e = ifp + NAOEIFS;
6068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		for (; ifp < e && ifp->nd; ifp++) {
6168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin			for (nnd = nds; nnd < nd; nnd++)
6268e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin				if (*nnd == ifp->nd)
6368e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin					break;
6468e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin			if (nnd == nd && nd != ne)
6568e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin				*nd++ = ifp->nd;
6668e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		}
6768e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	}
681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
6968e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	ne = nd;
7068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	nd = nds;
7168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	if (*nd == NULL)
7268e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		return snprintf(page, PAGE_SIZE, "none\n");
7368e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	for (p = page; nd < ne; nd++)
7468e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
7568e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin			p == page ? "" : ",", (*nd)->name);
7668e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	p += snprintf(p, PAGE_SIZE - (p-page), "\n");
7768e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	return p-page;
781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
794613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin/* firmware version */
80edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic ssize_t aoedisk_show_fwver(struct device *dev,
81edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers				  struct device_attribute *attr, char *page)
824613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin{
83edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	struct gendisk *disk = dev_to_disk(dev);
844613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin	struct aoedev *d = disk->private_data;
854613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin
864613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
874613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin}
881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
89edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
90edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
91edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
92edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic struct device_attribute dev_attr_firmware_version = {
93edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	.attr = { .name = "firmware-version", .mode = S_IRUGO, .owner = THIS_MODULE },
94edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	.show = aoedisk_show_fwver,
954613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin};
961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
974ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartmanstatic struct attribute *aoe_attrs[] = {
98edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	&dev_attr_state.attr,
99edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	&dev_attr_mac.attr,
100edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	&dev_attr_netif.attr,
101edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	&dev_attr_firmware_version.attr,
102edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	NULL,
1034ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartman};
1044ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartman
1054ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartmanstatic const struct attribute_group attr_group = {
1064ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartman	.attrs = aoe_attrs,
1074ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartman};
1084ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartman
1094ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartmanstatic int
1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoedisk_add_sysfs(struct aoedev *d)
1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
112edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	return sysfs_create_group(&d->gd->dev.kobj, &attr_group);
1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid
1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoedisk_rm_sysfs(struct aoedev *d)
1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
117edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	sysfs_remove_group(&d->gd->dev.kobj, &attr_group);
1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int
1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoeblk_open(struct inode *inode, struct file *filp)
1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d;
1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	ulong flags;
1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	d = inode->i_bdev->bd_disk->private_data;
1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_lock_irqsave(&d->lock, flags);
1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if (d->flags & DEVFL_UP) {
1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		d->nopen++;
1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		spin_unlock_irqrestore(&d->lock, flags);
1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		return 0;
1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_unlock_irqrestore(&d->lock, flags);
1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	return -ENODEV;
1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int
1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoeblk_release(struct inode *inode, struct file *filp)
1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d;
1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	ulong flags;
1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	d = inode->i_bdev->bd_disk->private_data;
1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_lock_irqsave(&d->lock, flags);
1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1485f7702fd737d14de3ed06a94a1655be9d43f7e35Ed L. Cashin	if (--d->nopen == 0) {
1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		spin_unlock_irqrestore(&d->lock, flags);
1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		aoecmd_cfg(d->aoemajor, d->aoeminor);
1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		return 0;
1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_unlock_irqrestore(&d->lock, flags);
1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	return 0;
1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int
159165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboeaoeblk_make_request(struct request_queue *q, struct bio *bio)
1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
161e9bb8fb0b6d61a822201537b25206a0ca34b9d1dDavid S. Miller	struct sk_buff_head queue;
1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d;
1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct buf *buf;
1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	ulong flags;
1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	blk_queue_bounce(q, &bio);
1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
16868e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	if (bio == NULL) {
16968e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		printk(KERN_ERR "aoe: bio is NULL\n");
17068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		BUG();
17168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		return 0;
17268e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	}
1731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	d = bio->bi_bdev->bd_disk->private_data;
17468e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	if (d == NULL) {
17568e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n");
17668e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		BUG();
17768e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		bio_endio(bio, -ENXIO);
17868e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		return 0;
17968e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	} else if (bio->bi_io_vec == NULL) {
18068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
18168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		BUG();
18268e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		bio_endio(bio, -ENXIO);
18368e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		return 0;
18468e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	}
1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	buf = mempool_alloc(d->bufpool, GFP_NOIO);
1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if (buf == NULL) {
187a12c93f08b8fc83b7fcdabaf92b1adcea7489f5eEd L. Cashin		printk(KERN_INFO "aoe: buf allocation failure\n");
1886712ecf8f648118c3363c142196418f89a510b90NeilBrown		bio_endio(bio, -ENOMEM);
1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		return 0;
1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	memset(buf, 0, sizeof(*buf));
1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	INIT_LIST_HEAD(&buf->bufs);
19368e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	buf->stime = jiffies;
1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	buf->bio = bio;
1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	buf->resid = bio->bi_size;
1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	buf->sector = bio->bi_sector;
197392e4845f9728114f7ffa8d7612683397fd4d441Ed L. Cashin	buf->bv = &bio->bi_io_vec[bio->bi_idx];
1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	buf->bv_resid = buf->bv->bv_len;
19968e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	WARN_ON(buf->bv_resid == 0);
20068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	buf->bv_off = buf->bv->bv_offset;
2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_lock_irqsave(&d->lock, flags);
2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if ((d->flags & DEVFL_UP) == 0) {
2051d75981a8094e9f84fae65a6a83b361e3893b971Ed L. Cashin		printk(KERN_INFO "aoe: device %ld.%d is not up\n",
206a12c93f08b8fc83b7fcdabaf92b1adcea7489f5eEd L. Cashin			d->aoemajor, d->aoeminor);
2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		spin_unlock_irqrestore(&d->lock, flags);
2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		mempool_free(buf, d->bufpool);
2096712ecf8f648118c3363c142196418f89a510b90NeilBrown		bio_endio(bio, -ENXIO);
2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		return 0;
2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	list_add_tail(&buf->bufs, &d->bufq);
2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2153ae1c24e395b2b65326439622223d88d92bfa03aEd L. Cashin	aoecmd_work(d);
216e9bb8fb0b6d61a822201537b25206a0ca34b9d1dDavid S. Miller	__skb_queue_head_init(&queue);
217e9bb8fb0b6d61a822201537b25206a0ca34b9d1dDavid S. Miller	skb_queue_splice_init(&d->sendq, &queue);
2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_unlock_irqrestore(&d->lock, flags);
220e9bb8fb0b6d61a822201537b25206a0ca34b9d1dDavid S. Miller	aoenet_xmit(&queue);
2213ae1c24e395b2b65326439622223d88d92bfa03aEd L. Cashin
2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	return 0;
2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int
226a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwigaoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
228a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	struct aoedev *d = bdev->bd_disk->private_data;
2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if ((d->flags & DEVFL_UP) == 0) {
231a12c93f08b8fc83b7fcdabaf92b1adcea7489f5eEd L. Cashin		printk(KERN_ERR "aoe: disk not up\n");
2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		return -ENODEV;
2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
235a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	geo->cylinders = d->geo.cylinders;
236a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	geo->heads = d->geo.heads;
237a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	geo->sectors = d->geo.sectors;
238a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	return 0;
2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct block_device_operations aoe_bdops = {
2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	.open = aoeblk_open,
2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	.release = aoeblk_release,
244a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	.getgeo = aoeblk_getgeo,
2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	.owner = THIS_MODULE,
2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds};
2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* alloc_disk and add_disk can sleep */
2491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid
2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoeblk_gdalloc(void *vp)
2511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d = vp;
2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct gendisk *gd;
2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	ulong flags;
2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	gd = alloc_disk(AOE_PARTITIONS);
2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if (gd == NULL) {
2581d75981a8094e9f84fae65a6a83b361e3893b971Ed L. Cashin		printk(KERN_ERR
2591d75981a8094e9f84fae65a6a83b361e3893b971Ed L. Cashin			"aoe: cannot allocate disk structure for %ld.%d\n",
2606bb6285fdb948cedee586c6bebc9ebc5e32a5c35Ed L. Cashin			d->aoemajor, d->aoeminor);
26143cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton		goto err;
2621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
26493d2341c750cda0df48a6cc67b35fe25f1ec47dfMatthew Dobson	d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if (d->bufpool == NULL) {
2661d75981a8094e9f84fae65a6a83b361e3893b971Ed L. Cashin		printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
2676bb6285fdb948cedee586c6bebc9ebc5e32a5c35Ed L. Cashin			d->aoemajor, d->aoeminor);
26843cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton		goto err_disk;
2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	blk_queue_make_request(&d->blkq, aoeblk_make_request);
27243cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton	if (bdi_init(&d->blkq.backing_dev_info))
27343cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton		goto err_mempool;
27443cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton	spin_lock_irqsave(&d->lock, flags);
2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	gd->major = AOE_MAJOR;
2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	gd->first_minor = d->sysminor * AOE_PARTITIONS;
2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	gd->fops = &aoe_bdops;
2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	gd->private_data = d;
2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	gd->capacity = d->ssize;
28068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		d->aoemajor, d->aoeminor);
2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	gd->queue = &d->blkq;
2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	d->gd = gd;
2853ae1c24e395b2b65326439622223d88d92bfa03aEd L. Cashin	d->flags &= ~DEVFL_GDALLOC;
2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	d->flags |= DEVFL_UP;
2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_unlock_irqrestore(&d->lock, flags);
2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	add_disk(gd);
2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	aoedisk_add_sysfs(d);
29243cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton	return;
29343cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton
29443cbe2cbdd5320f1ac785c6f016923609831effeAndrew Mortonerr_mempool:
29543cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton	mempool_destroy(d->bufpool);
29643cbe2cbdd5320f1ac785c6f016923609831effeAndrew Mortonerr_disk:
29743cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton	put_disk(gd);
29843cbe2cbdd5320f1ac785c6f016923609831effeAndrew Mortonerr:
29943cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton	spin_lock_irqsave(&d->lock, flags);
30043cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton	d->flags &= ~DEVFL_GDALLOC;
30143cbe2cbdd5320f1ac785c6f016923609831effeAndrew Morton	spin_unlock_irqrestore(&d->lock, flags);
3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid
3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoeblk_exit(void)
3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	kmem_cache_destroy(buf_pool_cache);
3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint __init
3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoeblk_init(void)
3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
31320c2df83d25c6a95affe6157a4c9cac4cf5ffaacPaul Mundt	buf_pool_cache = kmem_cache_create("aoe_bufs",
3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds					   sizeof(struct buf),
31520c2df83d25c6a95affe6157a4c9cac4cf5ffaacPaul Mundt					   0, 0, NULL);
3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if (buf_pool_cache == NULL)
3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		return -ENOMEM;
3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	return 0;
3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
322