1 /* Copyright (c) 2007 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/backing-dev.h> 10 #include <linux/fs.h> 11 #include <linux/ioctl.h> 12 #include <linux/slab.h> 13 #include <linux/genhd.h> 14 #include <linux/netdevice.h> 15 #include <linux/smp_lock.h> 16 #include "aoe.h" 17 18 static struct kmem_cache *buf_pool_cache; 19 20 static ssize_t aoedisk_show_state(struct device *dev, 21 struct device_attribute *attr, char *page) 22 { 23 struct gendisk *disk = dev_to_disk(dev); 24 struct aoedev *d = disk->private_data; 25 26 return snprintf(page, PAGE_SIZE, 27 "%s%s\n", 28 (d->flags & DEVFL_UP) ? "up" : "down", 29 (d->flags & DEVFL_KICKME) ? ",kickme" : 30 (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : ""); 31 /* I'd rather see nopen exported so we can ditch closewait */ 32 } 33 static ssize_t aoedisk_show_mac(struct device *dev, 34 struct device_attribute *attr, char *page) 35 { 36 struct gendisk *disk = dev_to_disk(dev); 37 struct aoedev *d = disk->private_data; 38 struct aoetgt *t = d->targets[0]; 39 40 if (t == NULL) 41 return snprintf(page, PAGE_SIZE, "none\n"); 42 return snprintf(page, PAGE_SIZE, "%pm\n", t->addr); 43 } 44 static ssize_t aoedisk_show_netif(struct device *dev, 45 struct device_attribute *attr, char *page) 46 { 47 struct gendisk *disk = dev_to_disk(dev); 48 struct aoedev *d = disk->private_data; 49 struct net_device *nds[8], **nd, **nnd, **ne; 50 struct aoetgt **t, **te; 51 struct aoeif *ifp, *e; 52 char *p; 53 54 memset(nds, 0, sizeof nds); 55 nd = nds; 56 ne = nd + ARRAY_SIZE(nds); 57 t = d->targets; 58 te = t + NTARGETS; 59 for (; t < te && *t; t++) { 60 ifp = (*t)->ifs; 61 e = ifp + NAOEIFS; 62 for (; ifp < e && ifp->nd; ifp++) { 63 for (nnd = nds; nnd < nd; nnd++) 64 if (*nnd == ifp->nd) 65 break; 66 if (nnd == nd && nd != ne) 67 *nd++ = ifp->nd; 68 } 69 } 70 71 ne = nd; 72 nd = nds; 73 if (*nd == NULL) 74 return snprintf(page, PAGE_SIZE, "none\n"); 75 for (p = page; nd < ne; nd++) 76 p += snprintf(p, PAGE_SIZE - (p-page), "%s%s", 77 p == page ? "" : ",", (*nd)->name); 78 p += snprintf(p, PAGE_SIZE - (p-page), "\n"); 79 return p-page; 80 } 81 /* firmware version */ 82 static ssize_t aoedisk_show_fwver(struct device *dev, 83 struct device_attribute *attr, char *page) 84 { 85 struct gendisk *disk = dev_to_disk(dev); 86 struct aoedev *d = disk->private_data; 87 88 return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver); 89 } 90 91 static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL); 92 static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL); 93 static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL); 94 static struct device_attribute dev_attr_firmware_version = { 95 .attr = { .name = "firmware-version", .mode = S_IRUGO }, 96 .show = aoedisk_show_fwver, 97 }; 98 99 static struct attribute *aoe_attrs[] = { 100 &dev_attr_state.attr, 101 &dev_attr_mac.attr, 102 &dev_attr_netif.attr, 103 &dev_attr_firmware_version.attr, 104 NULL, 105 }; 106 107 static const struct attribute_group attr_group = { 108 .attrs = aoe_attrs, 109 }; 110 111 static int 112 aoedisk_add_sysfs(struct aoedev *d) 113 { 114 return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group); 115 } 116 void 117 aoedisk_rm_sysfs(struct aoedev *d) 118 { 119 sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group); 120 } 121 122 static int 123 aoeblk_open(struct block_device *bdev, fmode_t mode) 124 { 125 struct aoedev *d = bdev->bd_disk->private_data; 126 ulong flags; 127 128 lock_kernel(); 129 spin_lock_irqsave(&d->lock, flags); 130 if (d->flags & DEVFL_UP) { 131 d->nopen++; 132 spin_unlock_irqrestore(&d->lock, flags); 133 unlock_kernel(); 134 return 0; 135 } 136 spin_unlock_irqrestore(&d->lock, flags); 137 unlock_kernel(); 138 return -ENODEV; 139 } 140 141 static int 142 aoeblk_release(struct gendisk *disk, fmode_t mode) 143 { 144 struct aoedev *d = disk->private_data; 145 ulong flags; 146 147 spin_lock_irqsave(&d->lock, flags); 148 149 if (--d->nopen == 0) { 150 spin_unlock_irqrestore(&d->lock, flags); 151 aoecmd_cfg(d->aoemajor, d->aoeminor); 152 return 0; 153 } 154 spin_unlock_irqrestore(&d->lock, flags); 155 156 return 0; 157 } 158 159 static int 160 aoeblk_make_request(struct request_queue *q, struct bio *bio) 161 { 162 struct sk_buff_head queue; 163 struct aoedev *d; 164 struct buf *buf; 165 ulong flags; 166 167 blk_queue_bounce(q, &bio); 168 169 if (bio == NULL) { 170 printk(KERN_ERR "aoe: bio is NULL\n"); 171 BUG(); 172 return 0; 173 } 174 d = bio->bi_bdev->bd_disk->private_data; 175 if (d == NULL) { 176 printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n"); 177 BUG(); 178 bio_endio(bio, -ENXIO); 179 return 0; 180 } else if (bio->bi_rw & REQ_HARDBARRIER) { 181 bio_endio(bio, -EOPNOTSUPP); 182 return 0; 183 } else if (bio->bi_io_vec == NULL) { 184 printk(KERN_ERR "aoe: bi_io_vec is NULL\n"); 185 BUG(); 186 bio_endio(bio, -ENXIO); 187 return 0; 188 } 189 buf = mempool_alloc(d->bufpool, GFP_NOIO); 190 if (buf == NULL) { 191 printk(KERN_INFO "aoe: buf allocation failure\n"); 192 bio_endio(bio, -ENOMEM); 193 return 0; 194 } 195 memset(buf, 0, sizeof(*buf)); 196 INIT_LIST_HEAD(&buf->bufs); 197 buf->stime = jiffies; 198 buf->bio = bio; 199 buf->resid = bio->bi_size; 200 buf->sector = bio->bi_sector; 201 buf->bv = &bio->bi_io_vec[bio->bi_idx]; 202 buf->bv_resid = buf->bv->bv_len; 203 WARN_ON(buf->bv_resid == 0); 204 buf->bv_off = buf->bv->bv_offset; 205 206 spin_lock_irqsave(&d->lock, flags); 207 208 if ((d->flags & DEVFL_UP) == 0) { 209 printk(KERN_INFO "aoe: device %ld.%d is not up\n", 210 d->aoemajor, d->aoeminor); 211 spin_unlock_irqrestore(&d->lock, flags); 212 mempool_free(buf, d->bufpool); 213 bio_endio(bio, -ENXIO); 214 return 0; 215 } 216 217 list_add_tail(&buf->bufs, &d->bufq); 218 219 aoecmd_work(d); 220 __skb_queue_head_init(&queue); 221 skb_queue_splice_init(&d->sendq, &queue); 222 223 spin_unlock_irqrestore(&d->lock, flags); 224 aoenet_xmit(&queue); 225 226 return 0; 227 } 228 229 static int 230 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo) 231 { 232 struct aoedev *d = bdev->bd_disk->private_data; 233 234 if ((d->flags & DEVFL_UP) == 0) { 235 printk(KERN_ERR "aoe: disk not up\n"); 236 return -ENODEV; 237 } 238 239 geo->cylinders = d->geo.cylinders; 240 geo->heads = d->geo.heads; 241 geo->sectors = d->geo.sectors; 242 return 0; 243 } 244 245 static const struct block_device_operations aoe_bdops = { 246 .open = aoeblk_open, 247 .release = aoeblk_release, 248 .getgeo = aoeblk_getgeo, 249 .owner = THIS_MODULE, 250 }; 251 252 /* alloc_disk and add_disk can sleep */ 253 void 254 aoeblk_gdalloc(void *vp) 255 { 256 struct aoedev *d = vp; 257 struct gendisk *gd; 258 ulong flags; 259 260 gd = alloc_disk(AOE_PARTITIONS); 261 if (gd == NULL) { 262 printk(KERN_ERR 263 "aoe: cannot allocate disk structure for %ld.%d\n", 264 d->aoemajor, d->aoeminor); 265 goto err; 266 } 267 268 d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache); 269 if (d->bufpool == NULL) { 270 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n", 271 d->aoemajor, d->aoeminor); 272 goto err_disk; 273 } 274 275 d->blkq = blk_alloc_queue(GFP_KERNEL); 276 if (!d->blkq) 277 goto err_mempool; 278 blk_queue_make_request(d->blkq, aoeblk_make_request); 279 d->blkq->backing_dev_info.name = "aoe"; 280 if (bdi_init(&d->blkq->backing_dev_info)) 281 goto err_blkq; 282 spin_lock_irqsave(&d->lock, flags); 283 gd->major = AOE_MAJOR; 284 gd->first_minor = d->sysminor * AOE_PARTITIONS; 285 gd->fops = &aoe_bdops; 286 gd->private_data = d; 287 set_capacity(gd, d->ssize); 288 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d", 289 d->aoemajor, d->aoeminor); 290 291 gd->queue = d->blkq; 292 d->gd = gd; 293 d->flags &= ~DEVFL_GDALLOC; 294 d->flags |= DEVFL_UP; 295 296 spin_unlock_irqrestore(&d->lock, flags); 297 298 add_disk(gd); 299 aoedisk_add_sysfs(d); 300 return; 301 302 err_blkq: 303 blk_cleanup_queue(d->blkq); 304 d->blkq = NULL; 305 err_mempool: 306 mempool_destroy(d->bufpool); 307 err_disk: 308 put_disk(gd); 309 err: 310 spin_lock_irqsave(&d->lock, flags); 311 d->flags &= ~DEVFL_GDALLOC; 312 spin_unlock_irqrestore(&d->lock, flags); 313 } 314 315 void 316 aoeblk_exit(void) 317 { 318 kmem_cache_destroy(buf_pool_cache); 319 } 320 321 int __init 322 aoeblk_init(void) 323 { 324 buf_pool_cache = kmem_cache_create("aoe_bufs", 325 sizeof(struct buf), 326 0, 0, NULL); 327 if (buf_pool_cache == NULL) 328 return -ENOMEM; 329 330 return 0; 331 } 332 333