1 /* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */ 2 /* 3 * aoeblk.c 4 * block device routines 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/hdreg.h> 9 #include <linux/blkdev.h> 10 #include <linux/backing-dev.h> 11 #include <linux/fs.h> 12 #include <linux/ioctl.h> 13 #include <linux/slab.h> 14 #include <linux/ratelimit.h> 15 #include <linux/genhd.h> 16 #include <linux/netdevice.h> 17 #include <linux/mutex.h> 18 #include <linux/export.h> 19 #include <linux/moduleparam.h> 20 #include <linux/debugfs.h> 21 #include <scsi/sg.h> 22 #include "aoe.h" 23 24 static DEFINE_MUTEX(aoeblk_mutex); 25 static struct kmem_cache *buf_pool_cache; 26 static struct dentry *aoe_debugfs_dir; 27 28 /* GPFS needs a larger value than the default. */ 29 static int aoe_maxsectors; 30 module_param(aoe_maxsectors, int, 0644); 31 MODULE_PARM_DESC(aoe_maxsectors, 32 "When nonzero, set the maximum number of sectors per I/O request"); 33 34 static ssize_t aoedisk_show_state(struct device *dev, 35 struct device_attribute *attr, char *page) 36 { 37 struct gendisk *disk = dev_to_disk(dev); 38 struct aoedev *d = disk->private_data; 39 40 return snprintf(page, PAGE_SIZE, 41 "%s%s\n", 42 (d->flags & DEVFL_UP) ? "up" : "down", 43 (d->flags & DEVFL_KICKME) ? ",kickme" : 44 (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : ""); 45 /* I'd rather see nopen exported so we can ditch closewait */ 46 } 47 static ssize_t aoedisk_show_mac(struct device *dev, 48 struct device_attribute *attr, char *page) 49 { 50 struct gendisk *disk = dev_to_disk(dev); 51 struct aoedev *d = disk->private_data; 52 struct aoetgt *t = d->targets[0]; 53 54 if (t == NULL) 55 return snprintf(page, PAGE_SIZE, "none\n"); 56 return snprintf(page, PAGE_SIZE, "%pm\n", t->addr); 57 } 58 static ssize_t aoedisk_show_netif(struct device *dev, 59 struct device_attribute *attr, char *page) 60 { 61 struct gendisk *disk = dev_to_disk(dev); 62 struct aoedev *d = disk->private_data; 63 struct net_device *nds[8], **nd, **nnd, **ne; 64 struct aoetgt **t, **te; 65 struct aoeif *ifp, *e; 66 char *p; 67 68 memset(nds, 0, sizeof nds); 69 nd = nds; 70 ne = nd + ARRAY_SIZE(nds); 71 t = d->targets; 72 te = t + d->ntargets; 73 for (; t < te && *t; t++) { 74 ifp = (*t)->ifs; 75 e = ifp + NAOEIFS; 76 for (; ifp < e && ifp->nd; ifp++) { 77 for (nnd = nds; nnd < nd; nnd++) 78 if (*nnd == ifp->nd) 79 break; 80 if (nnd == nd && nd != ne) 81 *nd++ = ifp->nd; 82 } 83 } 84 85 ne = nd; 86 nd = nds; 87 if (*nd == NULL) 88 return snprintf(page, PAGE_SIZE, "none\n"); 89 for (p = page; nd < ne; nd++) 90 p += snprintf(p, PAGE_SIZE - (p-page), "%s%s", 91 p == page ? "" : ",", (*nd)->name); 92 p += snprintf(p, PAGE_SIZE - (p-page), "\n"); 93 return p-page; 94 } 95 /* firmware version */ 96 static ssize_t aoedisk_show_fwver(struct device *dev, 97 struct device_attribute *attr, char *page) 98 { 99 struct gendisk *disk = dev_to_disk(dev); 100 struct aoedev *d = disk->private_data; 101 102 return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver); 103 } 104 static ssize_t aoedisk_show_payload(struct device *dev, 105 struct device_attribute *attr, char *page) 106 { 107 struct gendisk *disk = dev_to_disk(dev); 108 struct aoedev *d = disk->private_data; 109 110 return snprintf(page, PAGE_SIZE, "%lu\n", d->maxbcnt); 111 } 112 113 static int aoedisk_debugfs_show(struct seq_file *s, void *ignored) 114 { 115 struct aoedev *d; 116 struct aoetgt **t, **te; 117 struct aoeif *ifp, *ife; 118 unsigned long flags; 119 char c; 120 121 d = s->private; 122 seq_printf(s, "rttavg: %d rttdev: %d\n", 123 d->rttavg >> RTTSCALE, 124 d->rttdev >> RTTDSCALE); 125 seq_printf(s, "nskbpool: %d\n", skb_queue_len(&d->skbpool)); 126 seq_printf(s, "kicked: %ld\n", d->kicked); 127 seq_printf(s, "maxbcnt: %ld\n", d->maxbcnt); 128 seq_printf(s, "ref: %ld\n", d->ref); 129 130 spin_lock_irqsave(&d->lock, flags); 131 t = d->targets; 132 te = t + d->ntargets; 133 for (; t < te && *t; t++) { 134 c = '\t'; 135 seq_printf(s, "falloc: %ld\n", (*t)->falloc); 136 seq_printf(s, "ffree: %p\n", 137 list_empty(&(*t)->ffree) ? NULL : (*t)->ffree.next); 138 seq_printf(s, "%pm:%d:%d:%d\n", (*t)->addr, (*t)->nout, 139 (*t)->maxout, (*t)->nframes); 140 seq_printf(s, "\tssthresh:%d\n", (*t)->ssthresh); 141 seq_printf(s, "\ttaint:%d\n", (*t)->taint); 142 seq_printf(s, "\tr:%d\n", (*t)->rpkts); 143 seq_printf(s, "\tw:%d\n", (*t)->wpkts); 144 ifp = (*t)->ifs; 145 ife = ifp + ARRAY_SIZE((*t)->ifs); 146 for (; ifp->nd && ifp < ife; ifp++) { 147 seq_printf(s, "%c%s", c, ifp->nd->name); 148 c = ','; 149 } 150 seq_puts(s, "\n"); 151 } 152 spin_unlock_irqrestore(&d->lock, flags); 153 154 return 0; 155 } 156 157 static int aoe_debugfs_open(struct inode *inode, struct file *file) 158 { 159 return single_open(file, aoedisk_debugfs_show, inode->i_private); 160 } 161 162 static DEVICE_ATTR(state, 0444, aoedisk_show_state, NULL); 163 static DEVICE_ATTR(mac, 0444, aoedisk_show_mac, NULL); 164 static DEVICE_ATTR(netif, 0444, aoedisk_show_netif, NULL); 165 static struct device_attribute dev_attr_firmware_version = { 166 .attr = { .name = "firmware-version", .mode = 0444 }, 167 .show = aoedisk_show_fwver, 168 }; 169 static DEVICE_ATTR(payload, 0444, aoedisk_show_payload, NULL); 170 171 static struct attribute *aoe_attrs[] = { 172 &dev_attr_state.attr, 173 &dev_attr_mac.attr, 174 &dev_attr_netif.attr, 175 &dev_attr_firmware_version.attr, 176 &dev_attr_payload.attr, 177 NULL, 178 }; 179 180 static const struct attribute_group attr_group = { 181 .attrs = aoe_attrs, 182 }; 183 184 static const struct file_operations aoe_debugfs_fops = { 185 .open = aoe_debugfs_open, 186 .read = seq_read, 187 .llseek = seq_lseek, 188 .release = single_release, 189 }; 190 191 static void 192 aoedisk_add_debugfs(struct aoedev *d) 193 { 194 struct dentry *entry; 195 char *p; 196 197 if (aoe_debugfs_dir == NULL) 198 return; 199 p = strchr(d->gd->disk_name, '/'); 200 if (p == NULL) 201 p = d->gd->disk_name; 202 else 203 p++; 204 BUG_ON(*p == '\0'); 205 entry = debugfs_create_file(p, 0444, aoe_debugfs_dir, d, 206 &aoe_debugfs_fops); 207 if (IS_ERR_OR_NULL(entry)) { 208 pr_info("aoe: cannot create debugfs file for %s\n", 209 d->gd->disk_name); 210 return; 211 } 212 BUG_ON(d->debugfs); 213 d->debugfs = entry; 214 } 215 void 216 aoedisk_rm_debugfs(struct aoedev *d) 217 { 218 debugfs_remove(d->debugfs); 219 d->debugfs = NULL; 220 } 221 222 static int 223 aoedisk_add_sysfs(struct aoedev *d) 224 { 225 return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group); 226 } 227 void 228 aoedisk_rm_sysfs(struct aoedev *d) 229 { 230 sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group); 231 } 232 233 static int 234 aoeblk_open(struct block_device *bdev, fmode_t mode) 235 { 236 struct aoedev *d = bdev->bd_disk->private_data; 237 ulong flags; 238 239 if (!virt_addr_valid(d)) { 240 pr_crit("aoe: invalid device pointer in %s\n", 241 __func__); 242 WARN_ON(1); 243 return -ENODEV; 244 } 245 if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL) 246 return -ENODEV; 247 248 mutex_lock(&aoeblk_mutex); 249 spin_lock_irqsave(&d->lock, flags); 250 if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) { 251 d->nopen++; 252 spin_unlock_irqrestore(&d->lock, flags); 253 mutex_unlock(&aoeblk_mutex); 254 return 0; 255 } 256 spin_unlock_irqrestore(&d->lock, flags); 257 mutex_unlock(&aoeblk_mutex); 258 return -ENODEV; 259 } 260 261 static void 262 aoeblk_release(struct gendisk *disk, fmode_t mode) 263 { 264 struct aoedev *d = disk->private_data; 265 ulong flags; 266 267 spin_lock_irqsave(&d->lock, flags); 268 269 if (--d->nopen == 0) { 270 spin_unlock_irqrestore(&d->lock, flags); 271 aoecmd_cfg(d->aoemajor, d->aoeminor); 272 return; 273 } 274 spin_unlock_irqrestore(&d->lock, flags); 275 } 276 277 static void 278 aoeblk_request(struct request_queue *q) 279 { 280 struct aoedev *d; 281 struct request *rq; 282 283 d = q->queuedata; 284 if ((d->flags & DEVFL_UP) == 0) { 285 pr_info_ratelimited("aoe: device %ld.%d is not up\n", 286 d->aoemajor, d->aoeminor); 287 while ((rq = blk_peek_request(q))) { 288 blk_start_request(rq); 289 aoe_end_request(d, rq, 1); 290 } 291 return; 292 } 293 aoecmd_work(d); 294 } 295 296 static int 297 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo) 298 { 299 struct aoedev *d = bdev->bd_disk->private_data; 300 301 if ((d->flags & DEVFL_UP) == 0) { 302 printk(KERN_ERR "aoe: disk not up\n"); 303 return -ENODEV; 304 } 305 306 geo->cylinders = d->geo.cylinders; 307 geo->heads = d->geo.heads; 308 geo->sectors = d->geo.sectors; 309 return 0; 310 } 311 312 static int 313 aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg) 314 { 315 struct aoedev *d; 316 317 if (!arg) 318 return -EINVAL; 319 320 d = bdev->bd_disk->private_data; 321 if ((d->flags & DEVFL_UP) == 0) { 322 pr_err("aoe: disk not up\n"); 323 return -ENODEV; 324 } 325 326 if (cmd == HDIO_GET_IDENTITY) { 327 if (!copy_to_user((void __user *) arg, &d->ident, 328 sizeof(d->ident))) 329 return 0; 330 return -EFAULT; 331 } 332 333 /* udev calls scsi_id, which uses SG_IO, resulting in noise */ 334 if (cmd != SG_IO) 335 pr_info("aoe: unknown ioctl 0x%x\n", cmd); 336 337 return -ENOTTY; 338 } 339 340 static const struct block_device_operations aoe_bdops = { 341 .open = aoeblk_open, 342 .release = aoeblk_release, 343 .ioctl = aoeblk_ioctl, 344 .getgeo = aoeblk_getgeo, 345 .owner = THIS_MODULE, 346 }; 347 348 /* alloc_disk and add_disk can sleep */ 349 void 350 aoeblk_gdalloc(void *vp) 351 { 352 struct aoedev *d = vp; 353 struct gendisk *gd; 354 mempool_t *mp; 355 struct request_queue *q; 356 enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, }; 357 ulong flags; 358 int late = 0; 359 360 spin_lock_irqsave(&d->lock, flags); 361 if (d->flags & DEVFL_GDALLOC 362 && !(d->flags & DEVFL_TKILL) 363 && !(d->flags & DEVFL_GD_NOW)) 364 d->flags |= DEVFL_GD_NOW; 365 else 366 late = 1; 367 spin_unlock_irqrestore(&d->lock, flags); 368 if (late) 369 return; 370 371 gd = alloc_disk(AOE_PARTITIONS); 372 if (gd == NULL) { 373 pr_err("aoe: cannot allocate disk structure for %ld.%d\n", 374 d->aoemajor, d->aoeminor); 375 goto err; 376 } 377 378 mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab, 379 buf_pool_cache); 380 if (mp == NULL) { 381 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n", 382 d->aoemajor, d->aoeminor); 383 goto err_disk; 384 } 385 q = blk_init_queue(aoeblk_request, &d->lock); 386 if (q == NULL) { 387 pr_err("aoe: cannot allocate block queue for %ld.%d\n", 388 d->aoemajor, d->aoeminor); 389 goto err_mempool; 390 } 391 392 spin_lock_irqsave(&d->lock, flags); 393 WARN_ON(!(d->flags & DEVFL_GD_NOW)); 394 WARN_ON(!(d->flags & DEVFL_GDALLOC)); 395 WARN_ON(d->flags & DEVFL_TKILL); 396 WARN_ON(d->gd); 397 WARN_ON(d->flags & DEVFL_UP); 398 blk_queue_max_hw_sectors(q, BLK_DEF_MAX_SECTORS); 399 q->backing_dev_info->name = "aoe"; 400 q->backing_dev_info->ra_pages = READ_AHEAD / PAGE_SIZE; 401 d->bufpool = mp; 402 d->blkq = gd->queue = q; 403 q->queuedata = d; 404 d->gd = gd; 405 if (aoe_maxsectors) 406 blk_queue_max_hw_sectors(q, aoe_maxsectors); 407 gd->major = AOE_MAJOR; 408 gd->first_minor = d->sysminor; 409 gd->fops = &aoe_bdops; 410 gd->private_data = d; 411 set_capacity(gd, d->ssize); 412 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d", 413 d->aoemajor, d->aoeminor); 414 415 d->flags &= ~DEVFL_GDALLOC; 416 d->flags |= DEVFL_UP; 417 418 spin_unlock_irqrestore(&d->lock, flags); 419 420 add_disk(gd); 421 aoedisk_add_sysfs(d); 422 aoedisk_add_debugfs(d); 423 424 spin_lock_irqsave(&d->lock, flags); 425 WARN_ON(!(d->flags & DEVFL_GD_NOW)); 426 d->flags &= ~DEVFL_GD_NOW; 427 spin_unlock_irqrestore(&d->lock, flags); 428 return; 429 430 err_mempool: 431 mempool_destroy(mp); 432 err_disk: 433 put_disk(gd); 434 err: 435 spin_lock_irqsave(&d->lock, flags); 436 d->flags &= ~DEVFL_GD_NOW; 437 schedule_work(&d->work); 438 spin_unlock_irqrestore(&d->lock, flags); 439 } 440 441 void 442 aoeblk_exit(void) 443 { 444 debugfs_remove_recursive(aoe_debugfs_dir); 445 aoe_debugfs_dir = NULL; 446 kmem_cache_destroy(buf_pool_cache); 447 } 448 449 int __init 450 aoeblk_init(void) 451 { 452 buf_pool_cache = kmem_cache_create("aoe_bufs", 453 sizeof(struct buf), 454 0, 0, NULL); 455 if (buf_pool_cache == NULL) 456 return -ENOMEM; 457 aoe_debugfs_dir = debugfs_create_dir("aoe", NULL); 458 if (IS_ERR_OR_NULL(aoe_debugfs_dir)) { 459 pr_info("aoe: cannot create debugfs directory\n"); 460 aoe_debugfs_dir = NULL; 461 } 462 return 0; 463 } 464 465