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