aoeblk.c revision 52e112b3ab6b2b35a144565c8ea3bdda1e2845f2
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 16static struct kmem_cache *buf_pool_cache; 17 18static 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} 31static 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, "%012llx\n", mac_addr(t->addr)); 41} 42static 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 */ 80static 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 89static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL); 90static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL); 91static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL); 92static struct device_attribute dev_attr_firmware_version = { 93 .attr = { .name = "firmware-version", .mode = S_IRUGO, .owner = THIS_MODULE }, 94 .show = aoedisk_show_fwver, 95}; 96 97static 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 105static const struct attribute_group attr_group = { 106 .attrs = aoe_attrs, 107}; 108 109static int 110aoedisk_add_sysfs(struct aoedev *d) 111{ 112 return sysfs_create_group(&d->gd->dev.kobj, &attr_group); 113} 114void 115aoedisk_rm_sysfs(struct aoedev *d) 116{ 117 sysfs_remove_group(&d->gd->dev.kobj, &attr_group); 118} 119 120static int 121aoeblk_open(struct inode *inode, struct file *filp) 122{ 123 struct aoedev *d; 124 ulong flags; 125 126 d = inode->i_bdev->bd_disk->private_data; 127 128 spin_lock_irqsave(&d->lock, flags); 129 if (d->flags & DEVFL_UP) { 130 d->nopen++; 131 spin_unlock_irqrestore(&d->lock, flags); 132 return 0; 133 } 134 spin_unlock_irqrestore(&d->lock, flags); 135 return -ENODEV; 136} 137 138static int 139aoeblk_release(struct inode *inode, struct file *filp) 140{ 141 struct aoedev *d; 142 ulong flags; 143 144 d = inode->i_bdev->bd_disk->private_data; 145 146 spin_lock_irqsave(&d->lock, flags); 147 148 if (--d->nopen == 0) { 149 spin_unlock_irqrestore(&d->lock, flags); 150 aoecmd_cfg(d->aoemajor, d->aoeminor); 151 return 0; 152 } 153 spin_unlock_irqrestore(&d->lock, flags); 154 155 return 0; 156} 157 158static int 159aoeblk_make_request(struct request_queue *q, struct bio *bio) 160{ 161 struct aoedev *d; 162 struct buf *buf; 163 struct sk_buff *sl; 164 ulong flags; 165 166 blk_queue_bounce(q, &bio); 167 168 if (bio == NULL) { 169 printk(KERN_ERR "aoe: bio is NULL\n"); 170 BUG(); 171 return 0; 172 } 173 d = bio->bi_bdev->bd_disk->private_data; 174 if (d == NULL) { 175 printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n"); 176 BUG(); 177 bio_endio(bio, -ENXIO); 178 return 0; 179 } else if (bio->bi_io_vec == NULL) { 180 printk(KERN_ERR "aoe: bi_io_vec is NULL\n"); 181 BUG(); 182 bio_endio(bio, -ENXIO); 183 return 0; 184 } 185 buf = mempool_alloc(d->bufpool, GFP_NOIO); 186 if (buf == NULL) { 187 printk(KERN_INFO "aoe: buf allocation failure\n"); 188 bio_endio(bio, -ENOMEM); 189 return 0; 190 } 191 memset(buf, 0, sizeof(*buf)); 192 INIT_LIST_HEAD(&buf->bufs); 193 buf->stime = jiffies; 194 buf->bio = bio; 195 buf->resid = bio->bi_size; 196 buf->sector = bio->bi_sector; 197 buf->bv = &bio->bi_io_vec[bio->bi_idx]; 198 buf->bv_resid = buf->bv->bv_len; 199 WARN_ON(buf->bv_resid == 0); 200 buf->bv_off = buf->bv->bv_offset; 201 202 spin_lock_irqsave(&d->lock, flags); 203 204 if ((d->flags & DEVFL_UP) == 0) { 205 printk(KERN_INFO "aoe: device %ld.%d is not up\n", 206 d->aoemajor, d->aoeminor); 207 spin_unlock_irqrestore(&d->lock, flags); 208 mempool_free(buf, d->bufpool); 209 bio_endio(bio, -ENXIO); 210 return 0; 211 } 212 213 list_add_tail(&buf->bufs, &d->bufq); 214 215 aoecmd_work(d); 216 sl = d->sendq_hd; 217 d->sendq_hd = d->sendq_tl = NULL; 218 219 spin_unlock_irqrestore(&d->lock, flags); 220 aoenet_xmit(sl); 221 222 return 0; 223} 224 225static int 226aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo) 227{ 228 struct aoedev *d = bdev->bd_disk->private_data; 229 230 if ((d->flags & DEVFL_UP) == 0) { 231 printk(KERN_ERR "aoe: disk not up\n"); 232 return -ENODEV; 233 } 234 235 geo->cylinders = d->geo.cylinders; 236 geo->heads = d->geo.heads; 237 geo->sectors = d->geo.sectors; 238 return 0; 239} 240 241static struct block_device_operations aoe_bdops = { 242 .open = aoeblk_open, 243 .release = aoeblk_release, 244 .getgeo = aoeblk_getgeo, 245 .owner = THIS_MODULE, 246}; 247 248/* alloc_disk and add_disk can sleep */ 249void 250aoeblk_gdalloc(void *vp) 251{ 252 struct aoedev *d = vp; 253 struct gendisk *gd; 254 ulong flags; 255 256 gd = alloc_disk(AOE_PARTITIONS); 257 if (gd == NULL) { 258 printk(KERN_ERR 259 "aoe: cannot allocate disk structure for %ld.%d\n", 260 d->aoemajor, d->aoeminor); 261 goto err; 262 } 263 264 d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache); 265 if (d->bufpool == NULL) { 266 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n", 267 d->aoemajor, d->aoeminor); 268 goto err_disk; 269 } 270 271 blk_queue_make_request(&d->blkq, aoeblk_make_request); 272 if (bdi_init(&d->blkq.backing_dev_info)) 273 goto err_mempool; 274 spin_lock_irqsave(&d->lock, flags); 275 gd->major = AOE_MAJOR; 276 gd->first_minor = d->sysminor * AOE_PARTITIONS; 277 gd->fops = &aoe_bdops; 278 gd->private_data = d; 279 gd->capacity = d->ssize; 280 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d", 281 d->aoemajor, d->aoeminor); 282 283 gd->queue = &d->blkq; 284 d->gd = gd; 285 d->flags &= ~DEVFL_GDALLOC; 286 d->flags |= DEVFL_UP; 287 288 spin_unlock_irqrestore(&d->lock, flags); 289 290 add_disk(gd); 291 aoedisk_add_sysfs(d); 292 return; 293 294err_mempool: 295 mempool_destroy(d->bufpool); 296err_disk: 297 put_disk(gd); 298err: 299 spin_lock_irqsave(&d->lock, flags); 300 d->flags &= ~DEVFL_GDALLOC; 301 spin_unlock_irqrestore(&d->lock, flags); 302} 303 304void 305aoeblk_exit(void) 306{ 307 kmem_cache_destroy(buf_pool_cache); 308} 309 310int __init 311aoeblk_init(void) 312{ 313 buf_pool_cache = kmem_cache_create("aoe_bufs", 314 sizeof(struct buf), 315 0, 0, NULL); 316 if (buf_pool_cache == NULL) 317 return -ENOMEM; 318 319 return 0; 320} 321 322