aoeblk.c revision 68e0d42f39d85b334d3867a4e5fc2e0e775c1a6c
12611464d7f36685fb1990275d3de1e72e6aff9d9Ed L. Cashin/* Copyright (c) 2006 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");
401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	return snprintf(page, PAGE_SIZE, "%012llx\n",
4168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin			(unsigned long long)mac_addr(t->addr));
421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
43edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic ssize_t aoedisk_show_netif(struct device *dev,
44edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers				  struct device_attribute *attr, char *page)
451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
46edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	struct gendisk *disk = dev_to_disk(dev);
471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d = disk->private_data;
4868e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	struct net_device *nds[8], **nd, **nnd, **ne;
4968e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	struct aoetgt **t, **te;
5068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	struct aoeif *ifp, *e;
5168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	char *p;
5268e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin
5368e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	memset(nds, 0, sizeof nds);
5468e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	nd = nds;
5568e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	ne = nd + ARRAY_SIZE(nds);
5668e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	t = d->targets;
5768e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	te = t + NTARGETS;
5868e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	for (; t < te && *t; t++) {
5968e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		ifp = (*t)->ifs;
6068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		e = ifp + NAOEIFS;
6168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		for (; ifp < e && ifp->nd; ifp++) {
6268e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin			for (nnd = nds; nnd < nd; nnd++)
6368e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin				if (*nnd == ifp->nd)
6468e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin					break;
6568e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin			if (nnd == nd && nd != ne)
6668e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin				*nd++ = ifp->nd;
6768e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		}
6868e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	}
691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
7068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	ne = nd;
7168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	nd = nds;
7268e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	if (*nd == NULL)
7368e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		return snprintf(page, PAGE_SIZE, "none\n");
7468e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	for (p = page; nd < ne; nd++)
7568e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
7668e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin			p == page ? "" : ",", (*nd)->name);
7768e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	p += snprintf(p, PAGE_SIZE - (p-page), "\n");
7868e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	return p-page;
791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
804613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin/* firmware version */
81edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic ssize_t aoedisk_show_fwver(struct device *dev,
82edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers				  struct device_attribute *attr, char *page)
834613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin{
84edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	struct gendisk *disk = dev_to_disk(dev);
854613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin	struct aoedev *d = disk->private_data;
864613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin
874613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
884613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin}
891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
90edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
91edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
92edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
93edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sieversstatic struct device_attribute dev_attr_firmware_version = {
94edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	.attr = { .name = "firmware-version", .mode = S_IRUGO, .owner = THIS_MODULE },
95edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	.show = aoedisk_show_fwver,
964613ed277ab8a41640434181898ef4649cc7301eEd L. Cashin};
971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
984ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartmanstatic struct attribute *aoe_attrs[] = {
99edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	&dev_attr_state.attr,
100edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	&dev_attr_mac.attr,
101edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	&dev_attr_netif.attr,
102edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	&dev_attr_firmware_version.attr,
103edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	NULL,
1044ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartman};
1054ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartman
1064ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartmanstatic const struct attribute_group attr_group = {
1074ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartman	.attrs = aoe_attrs,
1084ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartman};
1094ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartman
1104ca5224f3ea4779054d96e885ca9b3980801ce13Greg Kroah-Hartmanstatic int
1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoedisk_add_sysfs(struct aoedev *d)
1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
113edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	return sysfs_create_group(&d->gd->dev.kobj, &attr_group);
1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid
1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoedisk_rm_sysfs(struct aoedev *d)
1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
118edfaa7c36574f1bf09c65ad602412db9da5f96bfKay Sievers	sysfs_remove_group(&d->gd->dev.kobj, &attr_group);
1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int
1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoeblk_open(struct inode *inode, struct file *filp)
1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d;
1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	ulong flags;
1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	d = inode->i_bdev->bd_disk->private_data;
1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_lock_irqsave(&d->lock, flags);
1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if (d->flags & DEVFL_UP) {
1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		d->nopen++;
1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		spin_unlock_irqrestore(&d->lock, flags);
1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		return 0;
1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_unlock_irqrestore(&d->lock, flags);
1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	return -ENODEV;
1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int
1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoeblk_release(struct inode *inode, struct file *filp)
1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d;
1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	ulong flags;
1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	d = inode->i_bdev->bd_disk->private_data;
1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_lock_irqsave(&d->lock, flags);
1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1495f7702fd737d14de3ed06a94a1655be9d43f7e35Ed L. Cashin	if (--d->nopen == 0) {
1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		spin_unlock_irqrestore(&d->lock, flags);
1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		aoecmd_cfg(d->aoemajor, d->aoeminor);
1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		return 0;
1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_unlock_irqrestore(&d->lock, flags);
1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	return 0;
1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int
160165125e1e480f9510a5ffcfbfee4e3ee38c05f23Jens Axboeaoeblk_make_request(struct request_queue *q, struct bio *bio)
1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d;
1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct buf *buf;
1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct sk_buff *sl;
1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	ulong flags;
1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	blk_queue_bounce(q, &bio);
1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
16968e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	if (bio == NULL) {
17068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		printk(KERN_ERR "aoe: bio is NULL\n");
17168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		BUG();
17268e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		return 0;
17368e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	}
1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	d = bio->bi_bdev->bd_disk->private_data;
17568e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	if (d == NULL) {
17668e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n");
17768e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		BUG();
17868e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		bio_endio(bio, -ENXIO);
17968e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		return 0;
18068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	} else if (bio->bi_io_vec == NULL) {
18168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
18268e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		BUG();
18368e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		bio_endio(bio, -ENXIO);
18468e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin		return 0;
18568e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	}
1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	buf = mempool_alloc(d->bufpool, GFP_NOIO);
1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if (buf == NULL) {
188a12c93f08b8fc83b7fcdabaf92b1adcea7489f5eEd L. Cashin		printk(KERN_INFO "aoe: buf allocation failure\n");
1896712ecf8f648118c3363c142196418f89a510b90NeilBrown		bio_endio(bio, -ENOMEM);
1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		return 0;
1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	memset(buf, 0, sizeof(*buf));
1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	INIT_LIST_HEAD(&buf->bufs);
19468e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	buf->stime = jiffies;
1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	buf->bio = bio;
1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	buf->resid = bio->bi_size;
1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	buf->sector = bio->bi_sector;
198392e4845f9728114f7ffa8d7612683397fd4d441Ed L. Cashin	buf->bv = &bio->bi_io_vec[bio->bi_idx];
1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	buf->bv_resid = buf->bv->bv_len;
20068e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	WARN_ON(buf->bv_resid == 0);
20168e0d42f39d85b334d3867a4e5fc2e0e775c1a6cEd L. Cashin	buf->bv_off = buf->bv->bv_offset;
2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_lock_irqsave(&d->lock, flags);
2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if ((d->flags & DEVFL_UP) == 0) {
206a12c93f08b8fc83b7fcdabaf92b1adcea7489f5eEd L. Cashin		printk(KERN_INFO "aoe: device %ld.%ld is not up\n",
207a12c93f08b8fc83b7fcdabaf92b1adcea7489f5eEd L. Cashin			d->aoemajor, d->aoeminor);
2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		spin_unlock_irqrestore(&d->lock, flags);
2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		mempool_free(buf, d->bufpool);
2106712ecf8f648118c3363c142196418f89a510b90NeilBrown		bio_endio(bio, -ENXIO);
2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		return 0;
2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	list_add_tail(&buf->bufs, &d->bufq);
2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2163ae1c24e395b2b65326439622223d88d92bfa03aEd L. Cashin	aoecmd_work(d);
217a4b38364093bf2094ff858ad45f490521bb87984Ed L. Cashin	sl = d->sendq_hd;
218a4b38364093bf2094ff858ad45f490521bb87984Ed L. Cashin	d->sendq_hd = d->sendq_tl = NULL;
2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	spin_unlock_irqrestore(&d->lock, flags);
2211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	aoenet_xmit(sl);
2223ae1c24e395b2b65326439622223d88d92bfa03aEd L. Cashin
2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	return 0;
2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int
227a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwigaoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
229a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	struct aoedev *d = bdev->bd_disk->private_data;
2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if ((d->flags & DEVFL_UP) == 0) {
232a12c93f08b8fc83b7fcdabaf92b1adcea7489f5eEd L. Cashin		printk(KERN_ERR "aoe: disk not up\n");
2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds		return -ENODEV;
2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	}
2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
236a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	geo->cylinders = d->geo.cylinders;
237a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	geo->heads = d->geo.heads;
238a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	geo->sectors = d->geo.sectors;
239a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	return 0;
2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}
2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct block_device_operations aoe_bdops = {
2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	.open = aoeblk_open,
2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	.release = aoeblk_release,
245a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig	.getgeo = aoeblk_getgeo,
2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	.owner = THIS_MODULE,
2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds};
2481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* alloc_disk and add_disk can sleep */
2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid
2511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsaoeblk_gdalloc(void *vp)
2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{
2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct aoedev *d = vp;
2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	struct gendisk *gd;
2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	ulong flags;
2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds
2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	gd = alloc_disk(AOE_PARTITIONS);
2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds	if (gd == NULL) {
259a12c93f08b8fc83b7fcdabaf92b1adcea7489f5eEd L. Cashin		printk(KERN_ERR "aoe: cannot allocate disk structure for %ld.%ld\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) {
266a12c93f08b8fc83b7fcdabaf92b1adcea7489f5eEd L. Cashin		printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%ld\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