drivers/block/aoe/aoeblk.c

   1 /* Copyright (c) 2006 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_PAUSE) ? ",paused" :
  26                         (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
  27         /* I'd rather see nopen exported so we can ditch closewait */
  28 }
  29 static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page)
  30 {
  31         struct aoedev *d = disk->private_data;
  32
  33         return snprintf(page, PAGE_SIZE, "%012llx\n",
  34                         (unsigned long long)mac_addr(d->addr));
  35 }
  36 static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page)
  37 {
  38         struct aoedev *d = disk->private_data;
  39
  40         return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
  41 }
  42 /* firmware version */
  43 static ssize_t aoedisk_show_fwver(struct gendisk * disk, char *page)
  44 {
  45         struct aoedev *d = disk->private_data;
  46
  47         return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
  48 }
  49
  50 static struct disk_attribute disk_attr_state = {
  51         .attr = {.name = "state", .mode = S_IRUGO },
  52         .show = aoedisk_show_state
  53 };
  54 static struct disk_attribute disk_attr_mac = {
  55         .attr = {.name = "mac", .mode = S_IRUGO },
  56         .show = aoedisk_show_mac
  57 };
  58 static struct disk_attribute disk_attr_netif = {
  59         .attr = {.name = "netif", .mode = S_IRUGO },
  60         .show = aoedisk_show_netif
  61 };
  62 static struct disk_attribute disk_attr_fwver = {
  63         .attr = {.name = "firmware-version", .mode = S_IRUGO },
  64         .show = aoedisk_show_fwver
  65 };
  66
  67 static void
  68 aoedisk_add_sysfs(struct aoedev *d)
  69 {
  70         sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr);
  71         sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr);
  72         sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr);
  73         sysfs_create_file(&d->gd->kobj, &disk_attr_fwver.attr);
  74 }
  75 void
  76 aoedisk_rm_sysfs(struct aoedev *d)
  77 {
  78         sysfs_remove_link(&d->gd->kobj, "state");
  79         sysfs_remove_link(&d->gd->kobj, "mac");
  80         sysfs_remove_link(&d->gd->kobj, "netif");
  81         sysfs_remove_link(&d->gd->kobj, "firmware-version");
  82 }
  83
  84 static int
  85 aoeblk_open(struct inode *inode, struct file *filp)
  86 {
  87         struct aoedev *d;
  88         ulong flags;
  89
  90         d = inode->i_bdev->bd_disk->private_data;
  91
  92         spin_lock_irqsave(&d->lock, flags);
  93         if (d->flags & DEVFL_UP) {
  94                 d->nopen++;
  95                 spin_unlock_irqrestore(&d->lock, flags);
  96                 return 0;
  97         }
  98         spin_unlock_irqrestore(&d->lock, flags);
  99         return -ENODEV;
 100 }
 101
 102 static int
 103 aoeblk_release(struct inode *inode, struct file *filp)
 104 {
 105         struct aoedev *d;
 106         ulong flags;
 107
 108         d = inode->i_bdev->bd_disk->private_data;
 109
 110         spin_lock_irqsave(&d->lock, flags);
 111
 112         if (--d->nopen == 0) {
 113                 spin_unlock_irqrestore(&d->lock, flags);
 114                 aoecmd_cfg(d->aoemajor, d->aoeminor);
 115                 return 0;
 116         }
 117         spin_unlock_irqrestore(&d->lock, flags);
 118
 119         return 0;
 120 }
 121
 122 static int
 123 aoeblk_make_request(request_queue_t *q, struct bio *bio)
 124 {
 125         struct aoedev *d;
 126         struct buf *buf;
 127         struct sk_buff *sl;
 128         ulong flags;
 129
 130         blk_queue_bounce(q, &bio);
 131
 132         d = bio->bi_bdev->bd_disk->private_data;
 133         buf = mempool_alloc(d->bufpool, GFP_NOIO);
 134         if (buf == NULL) {
 135                 printk(KERN_INFO "aoe: aoeblk_make_request: buf allocation "
 136                         "failure\n");
 137                 bio_endio(bio, bio->bi_size, -ENOMEM);
 138                 return 0;
 139         }
 140         memset(buf, 0, sizeof(*buf));
 141         INIT_LIST_HEAD(&buf->bufs);
 142         buf->start_time = jiffies;
 143         buf->bio = bio;
 144         buf->resid = bio->bi_size;
 145         buf->sector = bio->bi_sector;
 146         buf->bv = buf->bio->bi_io_vec;
 147         buf->bv_resid = buf->bv->bv_len;
 148         buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset;
 149
 150         spin_lock_irqsave(&d->lock, flags);
 151
 152         if ((d->flags & DEVFL_UP) == 0) {
 153                 printk(KERN_INFO "aoe: aoeblk_make_request: device %ld.%ld is not up\n",
 154                         d->aoemajor, d->aoeminor);
 155                 spin_unlock_irqrestore(&d->lock, flags);
 156                 mempool_free(buf, d->bufpool);
 157                 bio_endio(bio, bio->bi_size, -ENXIO);
 158                 return 0;
 159         }
 160
 161         list_add_tail(&buf->bufs, &d->bufq);
 162
 163         aoecmd_work(d);
 164         sl = d->sendq_hd;
 165         d->sendq_hd = d->sendq_tl = NULL;
 166
 167         spin_unlock_irqrestore(&d->lock, flags);
 168         aoenet_xmit(sl);
 169
 170         return 0;
 171 }
 172
 173 static int
 174 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 175 {
 176         struct aoedev *d = bdev->bd_disk->private_data;
 177
 178         if ((d->flags & DEVFL_UP) == 0) {
 179                 printk(KERN_ERR "aoe: aoeblk_ioctl: disk not up\n");
 180                 return -ENODEV;
 181         }
 182
 183         geo->cylinders = d->geo.cylinders;
 184         geo->heads = d->geo.heads;
 185         geo->sectors = d->geo.sectors;
 186         return 0;
 187 }
 188
 189 static struct block_device_operations aoe_bdops = {
 190         .open = aoeblk_open,
 191         .release = aoeblk_release,
 192         .getgeo = aoeblk_getgeo,
 193         .owner = THIS_MODULE,
 194 };
 195
 196 /* alloc_disk and add_disk can sleep */
 197 void
 198 aoeblk_gdalloc(void *vp)
 199 {
 200         struct aoedev *d = vp;
 201         struct gendisk *gd;
 202         ulong flags;
 203
 204         gd = alloc_disk(AOE_PARTITIONS);
 205         if (gd == NULL) {
 206                 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate disk "
 207                         "structure for %ld.%ld\n", d->aoemajor, d->aoeminor);
 208                 spin_lock_irqsave(&d->lock, flags);
 209                 d->flags &= ~DEVFL_GDALLOC;
 210                 spin_unlock_irqrestore(&d->lock, flags);
 211                 return;
 212         }
 213
 214         d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
 215         if (d->bufpool == NULL) {
 216                 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool "
 217                         "for %ld.%ld\n", d->aoemajor, d->aoeminor);
 218                 put_disk(gd);
 219                 spin_lock_irqsave(&d->lock, flags);
 220                 d->flags &= ~DEVFL_GDALLOC;
 221                 spin_unlock_irqrestore(&d->lock, flags);
 222                 return;
 223         }
 224
 225         spin_lock_irqsave(&d->lock, flags);
 226         blk_queue_make_request(&d->blkq, aoeblk_make_request);
 227         gd->major = AOE_MAJOR;
 228         gd->first_minor = d->sysminor * AOE_PARTITIONS;
 229         gd->fops = &aoe_bdops;
 230         gd->private_data = d;
 231         gd->capacity = d->ssize;
 232         snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld",
 233                 d->aoemajor, d->aoeminor);
 234
 235         gd->queue = &d->blkq;
 236         d->gd = gd;
 237         d->flags &= ~DEVFL_GDALLOC;
 238         d->flags |= DEVFL_UP;
 239
 240         spin_unlock_irqrestore(&d->lock, flags);
 241
 242         add_disk(gd);
 243         aoedisk_add_sysfs(d);
 244 }
 245
 246 void
 247 aoeblk_exit(void)
 248 {
 249         kmem_cache_destroy(buf_pool_cache);
 250 }
 251
 252 int __init
 253 aoeblk_init(void)
 254 {
 255         buf_pool_cache = kmem_cache_create("aoe_bufs",
 256                                            sizeof(struct buf),
 257                                            0, 0, NULL, NULL);
 258         if (buf_pool_cache == NULL)
 259                 return -ENOMEM;
 260
 261         return 0;
 262 }
 263