You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
317 lines
7.1 KiB
317 lines
7.1 KiB
/* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */
|
|
/*
|
|
* aoeblk.c
|
|
* block device routines
|
|
*/
|
|
|
|
#include <linux/hdreg.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/backing-dev.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/ioctl.h>
|
|
#include <linux/genhd.h>
|
|
#include <linux/netdevice.h>
|
|
#include "aoe.h"
|
|
|
|
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;
|
|
|
|
spin_lock_irqsave(&d->lock, flags);
|
|
if (d->flags & DEVFL_UP) {
|
|
d->nopen++;
|
|
spin_unlock_irqrestore(&d->lock, flags);
|
|
return 0;
|
|
}
|
|
spin_unlock_irqrestore(&d->lock, flags);
|
|
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 int
|
|
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 0;
|
|
}
|
|
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 0;
|
|
} else if (bio->bi_io_vec == NULL) {
|
|
printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
|
|
BUG();
|
|
bio_endio(bio, -ENXIO);
|
|
return 0;
|
|
}
|
|
buf = mempool_alloc(d->bufpool, GFP_NOIO);
|
|
if (buf == NULL) {
|
|
printk(KERN_INFO "aoe: buf allocation failure\n");
|
|
bio_endio(bio, -ENOMEM);
|
|
return 0;
|
|
}
|
|
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) {
|
|
printk(KERN_INFO "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 0;
|
|
}
|
|
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 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;
|
|
}
|
|
|
|
blk_queue_make_request(&d->blkq, aoeblk_make_request);
|
|
if (bdi_init(&d->blkq.backing_dev_info))
|
|
goto err_mempool;
|
|
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_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;
|
|
}
|
|
|
|
|