1 /* Copyright (c) 2004 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/fs.h> 10 #include <linux/ioctl.h> 11 #include <linux/genhd.h> 12 #include <linux/netdevice.h> 13 #include "aoe.h" 14 15 static kmem_cache_t *buf_pool_cache; 16 17 /* add attributes for our block devices in sysfs */ 18 static ssize_t aoedisk_show_state(struct gendisk * disk, char *page) 19 { 20 struct aoedev *d = disk->private_data; 21 22 return snprintf(page, PAGE_SIZE, 23 "%s%s\n", 24 (d->flags & DEVFL_UP) ? "up" : "down", 25 (d->flags & DEVFL_CLOSEWAIT) ? ",closewait" : ""); 26 } 27 static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page) 28 { 29 struct aoedev *d = disk->private_data; 30 31 return snprintf(page, PAGE_SIZE, "%012llx\n", 32 (unsigned long long)mac_addr(d->addr)); 33 } 34 static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page) 35 { 36 struct aoedev *d = disk->private_data; 37 38 return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name); 39 } 40 /* firmware version */ 41 static ssize_t aoedisk_show_fwver(struct gendisk * disk, char *page) 42 { 43 struct aoedev *d = disk->private_data; 44 45 return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver); 46 } 47 48 static struct disk_attribute disk_attr_state = { 49 .attr = {.name = "state", .mode = S_IRUGO }, 50 .show = aoedisk_show_state 51 }; 52 static struct disk_attribute disk_attr_mac = { 53 .attr = {.name = "mac", .mode = S_IRUGO }, 54 .show = aoedisk_show_mac 55 }; 56 static struct disk_attribute disk_attr_netif = { 57 .attr = {.name = "netif", .mode = S_IRUGO }, 58 .show = aoedisk_show_netif 59 }; 60 static struct disk_attribute disk_attr_fwver = { 61 .attr = {.name = "firmware-version", .mode = S_IRUGO }, 62 .show = aoedisk_show_fwver 63 }; 64 65 static void 66 aoedisk_add_sysfs(struct aoedev *d) 67 { 68 sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr); 69 sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr); 70 sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr); 71 sysfs_create_file(&d->gd->kobj, &disk_attr_fwver.attr); 72 } 73 void 74 aoedisk_rm_sysfs(struct aoedev *d) 75 { 76 sysfs_remove_link(&d->gd->kobj, "state"); 77 sysfs_remove_link(&d->gd->kobj, "mac"); 78 sysfs_remove_link(&d->gd->kobj, "netif"); 79 sysfs_remove_link(&d->gd->kobj, "firmware-version"); 80 } 81 82 static int 83 aoeblk_open(struct inode *inode, struct file *filp) 84 { 85 struct aoedev *d; 86 ulong flags; 87 88 d = inode->i_bdev->bd_disk->private_data; 89 90 spin_lock_irqsave(&d->lock, flags); 91 if (d->flags & DEVFL_UP) { 92 d->nopen++; 93 spin_unlock_irqrestore(&d->lock, flags); 94 return 0; 95 } 96 spin_unlock_irqrestore(&d->lock, flags); 97 return -ENODEV; 98 } 99 100 static int 101 aoeblk_release(struct inode *inode, struct file *filp) 102 { 103 struct aoedev *d; 104 ulong flags; 105 106 d = inode->i_bdev->bd_disk->private_data; 107 108 spin_lock_irqsave(&d->lock, flags); 109 110 if (--d->nopen == 0 && (d->flags & DEVFL_CLOSEWAIT)) { 111 d->flags &= ~DEVFL_CLOSEWAIT; 112 spin_unlock_irqrestore(&d->lock, flags); 113 aoecmd_cfg(d->aoemajor, d->aoeminor); 114 return 0; 115 } 116 spin_unlock_irqrestore(&d->lock, flags); 117 118 return 0; 119 } 120 121 static int 122 aoeblk_make_request(request_queue_t *q, struct bio *bio) 123 { 124 struct aoedev *d; 125 struct buf *buf; 126 struct sk_buff *sl; 127 ulong flags; 128 129 blk_queue_bounce(q, &bio); 130 131 d = bio->bi_bdev->bd_disk->private_data; 132 buf = mempool_alloc(d->bufpool, GFP_NOIO); 133 if (buf == NULL) { 134 printk(KERN_INFO "aoe: aoeblk_make_request: buf allocation " 135 "failure\n"); 136 bio_endio(bio, bio->bi_size, -ENOMEM); 137 return 0; 138 } 139 memset(buf, 0, sizeof(*buf)); 140 INIT_LIST_HEAD(&buf->bufs); 141 buf->start_time = jiffies; 142 buf->bio = bio; 143 buf->resid = bio->bi_size; 144 buf->sector = bio->bi_sector; 145 buf->bv = buf->bio->bi_io_vec; 146 buf->bv_resid = buf->bv->bv_len; 147 buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset; 148 149 spin_lock_irqsave(&d->lock, flags); 150 151 if ((d->flags & DEVFL_UP) == 0) { 152 printk(KERN_INFO "aoe: aoeblk_make_request: device %ld.%ld is not up\n", 153 d->aoemajor, d->aoeminor); 154 spin_unlock_irqrestore(&d->lock, flags); 155 mempool_free(buf, d->bufpool); 156 bio_endio(bio, bio->bi_size, -ENXIO); 157 return 0; 158 } 159 160 list_add_tail(&buf->bufs, &d->bufq); 161 aoecmd_work(d); 162 163 sl = d->sendq_hd; 164 d->sendq_hd = d->sendq_tl = NULL; 165 166 spin_unlock_irqrestore(&d->lock, flags); 167 168 aoenet_xmit(sl); 169 return 0; 170 } 171 172 static int 173 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo) 174 { 175 struct aoedev *d = bdev->bd_disk->private_data; 176 177 if ((d->flags & DEVFL_UP) == 0) { 178 printk(KERN_ERR "aoe: aoeblk_ioctl: disk not up\n"); 179 return -ENODEV; 180 } 181 182 geo->cylinders = d->geo.cylinders; 183 geo->heads = d->geo.heads; 184 geo->sectors = d->geo.sectors; 185 return 0; 186 } 187 188 static struct block_device_operations aoe_bdops = { 189 .open = aoeblk_open, 190 .release = aoeblk_release, 191 .getgeo = aoeblk_getgeo, 192 .owner = THIS_MODULE, 193 }; 194 195 /* alloc_disk and add_disk can sleep */ 196 void 197 aoeblk_gdalloc(void *vp) 198 { 199 struct aoedev *d = vp; 200 struct gendisk *gd; 201 ulong flags; 202 203 gd = alloc_disk(AOE_PARTITIONS); 204 if (gd == NULL) { 205 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate disk " 206 "structure for %ld.%ld\n", d->aoemajor, d->aoeminor); 207 spin_lock_irqsave(&d->lock, flags); 208 d->flags &= ~DEVFL_WORKON; 209 spin_unlock_irqrestore(&d->lock, flags); 210 return; 211 } 212 213 d->bufpool = mempool_create(MIN_BUFS, 214 mempool_alloc_slab, mempool_free_slab, 215 buf_pool_cache); 216 if (d->bufpool == NULL) { 217 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool " 218 "for %ld.%ld\n", d->aoemajor, d->aoeminor); 219 put_disk(gd); 220 spin_lock_irqsave(&d->lock, flags); 221 d->flags &= ~DEVFL_WORKON; 222 spin_unlock_irqrestore(&d->lock, flags); 223 return; 224 } 225 226 spin_lock_irqsave(&d->lock, flags); 227 blk_queue_make_request(&d->blkq, aoeblk_make_request); 228 gd->major = AOE_MAJOR; 229 gd->first_minor = d->sysminor * AOE_PARTITIONS; 230 gd->fops = &aoe_bdops; 231 gd->private_data = d; 232 gd->capacity = d->ssize; 233 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld", 234 d->aoemajor, d->aoeminor); 235 236 gd->queue = &d->blkq; 237 d->gd = gd; 238 d->flags &= ~DEVFL_WORKON; 239 d->flags |= DEVFL_UP; 240 241 spin_unlock_irqrestore(&d->lock, flags); 242 243 add_disk(gd); 244 aoedisk_add_sysfs(d); 245 246 printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu " 247 "sectors\n", (unsigned long long)mac_addr(d->addr), 248 d->aoemajor, d->aoeminor, 249 d->fw_ver, (long long)d->ssize); 250 } 251 252 void 253 aoeblk_exit(void) 254 { 255 kmem_cache_destroy(buf_pool_cache); 256 } 257 258 int __init 259 aoeblk_init(void) 260 { 261 buf_pool_cache = kmem_cache_create("aoe_bufs", 262 sizeof(struct buf), 263 0, 0, NULL, NULL); 264 if (buf_pool_cache == NULL) 265 return -ENOMEM; 266 267 return 0; 268 } 269 270