aoeblk.c revision 02e031cbc843b010e72fcc05c76113c688b2860f
1/* Copyright (c) 2007 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 "aoe.h" 19 20static DEFINE_MUTEX(aoeblk_mutex); 21static struct kmem_cache *buf_pool_cache; 22 23static ssize_t aoedisk_show_state(struct device *dev, 24 struct device_attribute *attr, char *page) 25{ 26 struct gendisk *disk = dev_to_disk(dev); 27 struct aoedev *d = disk->private_data; 28 29 return snprintf(page, PAGE_SIZE, 30 "%s%s\n", 31 (d->flags & DEVFL_UP) ? "up" : "down", 32 (d->flags & DEVFL_KICKME) ? ",kickme" : 33 (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : ""); 34 /* I'd rather see nopen exported so we can ditch closewait */ 35} 36static ssize_t aoedisk_show_mac(struct device *dev, 37 struct device_attribute *attr, char *page) 38{ 39 struct gendisk *disk = dev_to_disk(dev); 40 struct aoedev *d = disk->private_data; 41 struct aoetgt *t = d->targets[0]; 42 43 if (t == NULL) 44 return snprintf(page, PAGE_SIZE, "none\n"); 45 return snprintf(page, PAGE_SIZE, "%pm\n", t->addr); 46} 47static ssize_t aoedisk_show_netif(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 net_device *nds[8], **nd, **nnd, **ne; 53 struct aoetgt **t, **te; 54 struct aoeif *ifp, *e; 55 char *p; 56 57 memset(nds, 0, sizeof nds); 58 nd = nds; 59 ne = nd + ARRAY_SIZE(nds); 60 t = d->targets; 61 te = t + NTARGETS; 62 for (; t < te && *t; t++) { 63 ifp = (*t)->ifs; 64 e = ifp + NAOEIFS; 65 for (; ifp < e && ifp->nd; ifp++) { 66 for (nnd = nds; nnd < nd; nnd++) 67 if (*nnd == ifp->nd) 68 break; 69 if (nnd == nd && nd != ne) 70 *nd++ = ifp->nd; 71 } 72 } 73 74 ne = nd; 75 nd = nds; 76 if (*nd == NULL) 77 return snprintf(page, PAGE_SIZE, "none\n"); 78 for (p = page; nd < ne; nd++) 79 p += snprintf(p, PAGE_SIZE - (p-page), "%s%s", 80 p == page ? "" : ",", (*nd)->name); 81 p += snprintf(p, PAGE_SIZE - (p-page), "\n"); 82 return p-page; 83} 84/* firmware version */ 85static ssize_t aoedisk_show_fwver(struct device *dev, 86 struct device_attribute *attr, char *page) 87{ 88 struct gendisk *disk = dev_to_disk(dev); 89 struct aoedev *d = disk->private_data; 90 91 return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver); 92} 93 94static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL); 95static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL); 96static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL); 97static struct device_attribute dev_attr_firmware_version = { 98 .attr = { .name = "firmware-version", .mode = S_IRUGO }, 99 .show = aoedisk_show_fwver, 100}; 101 102static struct attribute *aoe_attrs[] = { 103 &dev_attr_state.attr, 104 &dev_attr_mac.attr, 105 &dev_attr_netif.attr, 106 &dev_attr_firmware_version.attr, 107 NULL, 108}; 109 110static const struct attribute_group attr_group = { 111 .attrs = aoe_attrs, 112}; 113 114static int 115aoedisk_add_sysfs(struct aoedev *d) 116{ 117 return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group); 118} 119void 120aoedisk_rm_sysfs(struct aoedev *d) 121{ 122 sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group); 123} 124 125static int 126aoeblk_open(struct block_device *bdev, fmode_t mode) 127{ 128 struct aoedev *d = bdev->bd_disk->private_data; 129 ulong flags; 130 131 mutex_lock(&aoeblk_mutex); 132 spin_lock_irqsave(&d->lock, flags); 133 if (d->flags & DEVFL_UP) { 134 d->nopen++; 135 spin_unlock_irqrestore(&d->lock, flags); 136 mutex_unlock(&aoeblk_mutex); 137 return 0; 138 } 139 spin_unlock_irqrestore(&d->lock, flags); 140 mutex_unlock(&aoeblk_mutex); 141 return -ENODEV; 142} 143 144static int 145aoeblk_release(struct gendisk *disk, fmode_t mode) 146{ 147 struct aoedev *d = disk->private_data; 148 ulong flags; 149 150 spin_lock_irqsave(&d->lock, flags); 151 152 if (--d->nopen == 0) { 153 spin_unlock_irqrestore(&d->lock, flags); 154 aoecmd_cfg(d->aoemajor, d->aoeminor); 155 return 0; 156 } 157 spin_unlock_irqrestore(&d->lock, flags); 158 159 return 0; 160} 161 162static int 163aoeblk_make_request(struct request_queue *q, struct bio *bio) 164{ 165 struct sk_buff_head queue; 166 struct aoedev *d; 167 struct buf *buf; 168 ulong flags; 169 170 blk_queue_bounce(q, &bio); 171 172 if (bio == NULL) { 173 printk(KERN_ERR "aoe: bio is NULL\n"); 174 BUG(); 175 return 0; 176 } 177 d = bio->bi_bdev->bd_disk->private_data; 178 if (d == NULL) { 179 printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n"); 180 BUG(); 181 bio_endio(bio, -ENXIO); 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 pr_info_ratelimited("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 229static int 230aoeblk_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 245static 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 */ 253void 254aoeblk_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 302err_blkq: 303 blk_cleanup_queue(d->blkq); 304 d->blkq = NULL; 305err_mempool: 306 mempool_destroy(d->bufpool); 307err_disk: 308 put_disk(gd); 309err: 310 spin_lock_irqsave(&d->lock, flags); 311 d->flags &= ~DEVFL_GDALLOC; 312 spin_unlock_irqrestore(&d->lock, flags); 313} 314 315void 316aoeblk_exit(void) 317{ 318 kmem_cache_destroy(buf_pool_cache); 319} 320 321int __init 322aoeblk_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