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aoeblk.c

/* 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 gendisk * disk, char *page)
{
      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 gendisk * disk, char *page)
{
      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 gendisk * disk, char *page)
{
      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 gendisk * disk, char *page)
{
      struct aoedev *d = disk->private_data;

      return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
}

static struct disk_attribute disk_attr_state = {
      .attr = {.name = "state", .mode = S_IRUGO },
      .show = aoedisk_show_state
};
static struct disk_attribute disk_attr_mac = {
      .attr = {.name = "mac", .mode = S_IRUGO },
      .show = aoedisk_show_mac
};
static struct disk_attribute disk_attr_netif = {
      .attr = {.name = "netif", .mode = S_IRUGO },
      .show = aoedisk_show_netif
};
static struct disk_attribute disk_attr_fwver = {
      .attr = {.name = "firmware-version", .mode = S_IRUGO },
      .show = aoedisk_show_fwver
};

static struct attribute *aoe_attrs[] = {
      &disk_attr_state.attr,
      &disk_attr_mac.attr,
      &disk_attr_netif.attr,
      &disk_attr_fwver.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->kobj, &attr_group);
}
void
aoedisk_rm_sysfs(struct aoedev *d)
{
      sysfs_remove_group(&d->gd->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;
}


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