drivers/block/aoe/aoeblk.c

   1 /* Copyright (c) 2004 Coraid, Inc.  See COPYING for GPL terms. */
   2 /*
   3  * aoeblk.c
   4  * block device routines
   5  */
   6
   7 #include <linux/hdreg.h>
   8 #include <linux/blkdev.h>
   9 #include <linux/fs.h>
  10 #include <linux/ioctl.h>
  11 #include <linux/genhd.h>
  12 #include <linux/netdevice.h>
  13 #include "aoe.h"
  14
  15 static kmem_cache_t *buf_pool_cache;
  16
  17 /* add attributes for our block devices in sysfs */
  18 static ssize_t aoedisk_show_state(struct gendisk * disk, char *page)
  19 {
  20         struct aoedev *d = disk->private_data;
  21
  22         return snprintf(page, PAGE_SIZE,
  23                         "%s%s\n",
  24                         (d->flags & DEVFL_UP) ? "up" : "down",
  25                         (d->flags & DEVFL_CLOSEWAIT) ? ",closewait" : "");
  26 }
  27 static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page)
  28 {
  29         struct aoedev *d = disk->private_data;
  30
  31         return snprintf(page, PAGE_SIZE, "%012llx\n",
  32                         (unsigned long long)mac_addr(d->addr));
  33 }
  34 static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page)
  35 {
  36         struct aoedev *d = disk->private_data;
  37
  38         return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
  39 }
  40 /* firmware version */
  41 static ssize_t aoedisk_show_fwver(struct gendisk * disk, char *page)
  42 {
  43         struct aoedev *d = disk->private_data;
  44
  45         return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
  46 }
  47
  48 static struct disk_attribute disk_attr_state = {
  49         .attr = {.name = "state", .mode = S_IRUGO },
  50         .show = aoedisk_show_state
  51 };
  52 static struct disk_attribute disk_attr_mac = {
  53         .attr = {.name = "mac", .mode = S_IRUGO },
  54         .show = aoedisk_show_mac
  55 };
  56 static struct disk_attribute disk_attr_netif = {
  57         .attr = {.name = "netif", .mode = S_IRUGO },
  58         .show = aoedisk_show_netif
  59 };
  60 static struct disk_attribute disk_attr_fwver = {
  61         .attr = {.name = "firmware-version", .mode = S_IRUGO },
  62         .show = aoedisk_show_fwver
  63 };
  64
  65 static void
  66 aoedisk_add_sysfs(struct aoedev *d)
  67 {
  68         sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr);
  69         sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr);
  70         sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr);
  71         sysfs_create_file(&d->gd->kobj, &disk_attr_fwver.attr);
  72 }
  73 void
  74 aoedisk_rm_sysfs(struct aoedev *d)
  75 {
  76         sysfs_remove_link(&d->gd->kobj, "state");
  77         sysfs_remove_link(&d->gd->kobj, "mac");
  78         sysfs_remove_link(&d->gd->kobj, "netif");
  79         sysfs_remove_link(&d->gd->kobj, "firmware-version");
  80 }
  81
  82 static int
  83 aoeblk_open(struct inode *inode, struct file *filp)
  84 {
  85         struct aoedev *d;
  86         ulong flags;
  87
  88         d = inode->i_bdev->bd_disk->private_data;
  89
  90         spin_lock_irqsave(&d->lock, flags);
  91         if (d->flags & DEVFL_UP) {
  92                 d->nopen++;
  93                 spin_unlock_irqrestore(&d->lock, flags);
  94                 return 0;
  95         }
  96         spin_unlock_irqrestore(&d->lock, flags);
  97         return -ENODEV;
  98 }
  99
 100 static int
 101 aoeblk_release(struct inode *inode, struct file *filp)
 102 {
 103         struct aoedev *d;
 104         ulong flags;
 105
 106         d = inode->i_bdev->bd_disk->private_data;
 107
 108         spin_lock_irqsave(&d->lock, flags);
 109
 110         if (--d->nopen == 0 && (d->flags & DEVFL_CLOSEWAIT)) {
 111                 d->flags &= ~DEVFL_CLOSEWAIT;
 112                 spin_unlock_irqrestore(&d->lock, flags);
 113                 aoecmd_cfg(d->aoemajor, d->aoeminor);
 114                 return 0;
 115         }
 116         spin_unlock_irqrestore(&d->lock, flags);
 117
 118         return 0;
 119 }
 120
 121 static int
 122 aoeblk_make_request(request_queue_t *q, struct bio *bio)
 123 {
 124         struct aoedev *d;
 125         struct buf *buf;
 126         struct sk_buff *sl;
 127         ulong flags;
 128
 129         blk_queue_bounce(q, &bio);
 130
 131         d = bio->bi_bdev->bd_disk->private_data;
 132         buf = mempool_alloc(d->bufpool, GFP_NOIO);
 133         if (buf == NULL) {
 134                 printk(KERN_INFO "aoe: aoeblk_make_request: buf allocation "
 135                         "failure\n");
 136                 bio_endio(bio, bio->bi_size, -ENOMEM);
 137                 return 0;
 138         }
 139         memset(buf, 0, sizeof(*buf));
 140         INIT_LIST_HEAD(&buf->bufs);
 141         buf->start_time = jiffies;
 142         buf->bio = bio;
 143         buf->resid = bio->bi_size;
 144         buf->sector = bio->bi_sector;
 145         buf->bv = buf->bio->bi_io_vec;
 146         buf->bv_resid = buf->bv->bv_len;
 147         buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset;
 148
 149         spin_lock_irqsave(&d->lock, flags);
 150
 151         if ((d->flags & DEVFL_UP) == 0) {
 152                 printk(KERN_INFO "aoe: aoeblk_make_request: device %ld.%ld is not up\n",
 153                         d->aoemajor, d->aoeminor);
 154                 spin_unlock_irqrestore(&d->lock, flags);
 155                 mempool_free(buf, d->bufpool);
 156                 bio_endio(bio, bio->bi_size, -ENXIO);
 157                 return 0;
 158         }
 159
 160         list_add_tail(&buf->bufs, &d->bufq);
 161         aoecmd_work(d);
 162
 163         sl = d->sendq_hd;
 164         d->sendq_hd = d->sendq_tl = NULL;
 165
 166         spin_unlock_irqrestore(&d->lock, flags);
 167
 168         aoenet_xmit(sl);
 169         return 0;
 170 }
 171
 172 /* This ioctl implementation expects userland to have the device node
 173  * permissions set so that only priviledged users can open an aoe
 174  * block device directly.
 175  */
 176 static int
 177 aoeblk_ioctl(struct inode *inode, struct file *filp, uint cmd, ulong arg)
 178 {
 179         struct aoedev *d;
 180
 181         if (!arg)
 182                 return -EINVAL;
 183
 184         d = inode->i_bdev->bd_disk->private_data;
 185         if ((d->flags & DEVFL_UP) == 0) {
 186                 printk(KERN_ERR "aoe: aoeblk_ioctl: disk not up\n");
 187                 return -ENODEV;
 188         }
 189
 190         if (cmd == HDIO_GETGEO) {
 191                 d->geo.start = get_start_sect(inode->i_bdev);
 192                 if (!copy_to_user((void __user *) arg, &d->geo, sizeof d->geo))
 193                         return 0;
 194                 return -EFAULT;
 195         }
 196         printk(KERN_INFO "aoe: aoeblk_ioctl: unknown ioctl %d\n", cmd);
 197         return -EINVAL;
 198 }
 199
 200 static struct block_device_operations aoe_bdops = {
 201         .open = aoeblk_open,
 202         .release = aoeblk_release,
 203         .ioctl = aoeblk_ioctl,
 204         .owner = THIS_MODULE,
 205 };
 206
 207 /* alloc_disk and add_disk can sleep */
 208 void
 209 aoeblk_gdalloc(void *vp)
 210 {
 211         struct aoedev *d = vp;
 212         struct gendisk *gd;
 213         ulong flags;
 214
 215         gd = alloc_disk(AOE_PARTITIONS);
 216         if (gd == NULL) {
 217                 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate disk "
 218                         "structure for %ld.%ld\n", d->aoemajor, d->aoeminor);
 219                 spin_lock_irqsave(&d->lock, flags);
 220                 d->flags &= ~DEVFL_WORKON;
 221                 spin_unlock_irqrestore(&d->lock, flags);
 222                 return;
 223         }
 224
 225         d->bufpool = mempool_create(MIN_BUFS,
 226                                     mempool_alloc_slab, mempool_free_slab,
 227                                     buf_pool_cache);
 228         if (d->bufpool == NULL) {
 229                 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool "
 230                         "for %ld.%ld\n", d->aoemajor, d->aoeminor);
 231                 put_disk(gd);
 232                 spin_lock_irqsave(&d->lock, flags);
 233                 d->flags &= ~DEVFL_WORKON;
 234                 spin_unlock_irqrestore(&d->lock, flags);
 235                 return;
 236         }
 237
 238         spin_lock_irqsave(&d->lock, flags);
 239         blk_queue_make_request(&d->blkq, aoeblk_make_request);
 240         gd->major = AOE_MAJOR;
 241         gd->first_minor = d->sysminor * AOE_PARTITIONS;
 242         gd->fops = &aoe_bdops;
 243         gd->private_data = d;
 244         gd->capacity = d->ssize;
 245         snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld",
 246                 d->aoemajor, d->aoeminor);
 247
 248         gd->queue = &d->blkq;
 249         d->gd = gd;
 250         d->flags &= ~DEVFL_WORKON;
 251         d->flags |= DEVFL_UP;
 252
 253         spin_unlock_irqrestore(&d->lock, flags);
 254
 255         add_disk(gd);
 256         aoedisk_add_sysfs(d);
 257
 258         printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu "
 259                 "sectors\n", (unsigned long long)mac_addr(d->addr),
 260                 d->aoemajor, d->aoeminor,
 261                 d->fw_ver, (long long)d->ssize);
 262 }
 263
 264 void
 265 aoeblk_exit(void)
 266 {
 267         kmem_cache_destroy(buf_pool_cache);
 268 }
 269
 270 int __init
 271 aoeblk_init(void)
 272 {
 273         buf_pool_cache = kmem_cache_create("aoe_bufs",
 274                                            sizeof(struct buf),
 275                                            0, 0, NULL, NULL);
 276         if (buf_pool_cache == NULL)
 277                 return -ENOMEM;
 278
 279         return 0;
 280 }
 281