blob: 826d12381e21f546c099be3079604ca5412868f0 [file] [log] [blame]
/* Copyright (c) 2006 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_PAUSE) ? ",paused" :
(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;
return snprintf(page, PAGE_SIZE, "%012llx\n",
(unsigned long long)mac_addr(d->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;
return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
}
/* 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, .owner = THIS_MODULE },
.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(&d->gd->dev.kobj, &attr_group);
}
void
aoedisk_rm_sysfs(struct aoedev *d)
{
sysfs_remove_group(&d->gd->dev.kobj, &attr_group);
}
static int
aoeblk_open(struct inode *inode, struct file *filp)
{
struct aoedev *d;
ulong flags;
d = inode->i_bdev->bd_disk->private_data;
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 inode *inode, struct file *filp)
{
struct aoedev *d;
ulong flags;
d = inode->i_bdev->bd_disk->private_data;
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 aoedev *d;
struct buf *buf;
struct sk_buff *sl;
ulong flags;
blk_queue_bounce(q, &bio);
d = bio->bi_bdev->bd_disk->private_data;
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->start_time = jiffies;
buf->bio = bio;
buf->resid = bio->bi_size;
buf->sector = bio->bi_sector;
buf->bv = &bio->bi_io_vec[bio->bi_idx];
WARN_ON(buf->bv->bv_len == 0);
buf->bv_resid = buf->bv->bv_len;
buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset;
spin_lock_irqsave(&d->lock, flags);
if ((d->flags & DEVFL_UP) == 0) {
printk(KERN_INFO "aoe: device %ld.%ld 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);
sl = d->sendq_hd;
d->sendq_hd = d->sendq_tl = NULL;
spin_unlock_irqrestore(&d->lock, flags);
aoenet_xmit(sl);
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.%ld\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.%ld\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;
gd->capacity = d->ssize;
snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld",
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;
}