drivers/block/aoe/aoeblk.c

   1 /* Copyright (c) 2006 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_PAUSE) ? ",paused" :
  26                         (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
  27         /* I'd rather see nopen exported so we can ditch closewait */
  28 }
  29 static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page)
  30 {
  31         struct aoedev *d = disk->private_data;
  32
  33         return snprintf(page, PAGE_SIZE, "%012llx\n",
  34                         (unsigned long long)mac_addr(d->addr));
  35 }
  36 static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page)
  37 {
  38         struct aoedev *d = disk->private_data;
  39
  40         return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
  41 }
  42 /* firmware version */
  43 static ssize_t aoedisk_show_fwver(struct gendisk * disk, char *page)
  44 {
  45         struct aoedev *d = disk->private_data;
  46
  47         return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
  48 }
  49
  50 static struct disk_attribute disk_attr_state = {
  51         .attr = {.name = "state", .mode = S_IRUGO },
  52         .show = aoedisk_show_state
  53 };
  54 static struct disk_attribute disk_attr_mac = {
  55         .attr = {.name = "mac", .mode = S_IRUGO },
  56         .show = aoedisk_show_mac
  57 };
  58 static struct disk_attribute disk_attr_netif = {
  59         .attr = {.name = "netif", .mode = S_IRUGO },
  60         .show = aoedisk_show_netif
  61 };
  62 static struct disk_attribute disk_attr_fwver = {
  63         .attr = {.name = "firmware-version", .mode = S_IRUGO },
  64         .show = aoedisk_show_fwver
  65 };
  66
  67 static void
  68 aoedisk_add_sysfs(struct aoedev *d)
  69 {
  70         sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr);
  71         sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr);
  72         sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr);
  73         sysfs_create_file(&d->gd->kobj, &disk_attr_fwver.attr);
  74 }
  75 void
  76 aoedisk_rm_sysfs(struct aoedev *d)
  77 {
  78         sysfs_remove_link(&d->gd->kobj, "state");
  79         sysfs_remove_link(&d->gd->kobj, "mac");
  80         sysfs_remove_link(&d->gd->kobj, "netif");
  81         sysfs_remove_link(&d->gd->kobj, "firmware-version");
  82 }
  83
  84 static int
  85 aoeblk_open(struct inode *inode, struct file *filp)
  86 {
  87         struct aoedev *d;
  88         ulong flags;
  89
  90         d = inode->i_bdev->bd_disk->private_data;
  91
  92         spin_lock_irqsave(&d->lock, flags);
  93         if (d->flags & DEVFL_UP) {
  94                 d->nopen++;
  95                 spin_unlock_irqrestore(&d->lock, flags);
  96                 return 0;
  97         }
  98         spin_unlock_irqrestore(&d->lock, flags);
  99         return -ENODEV;
 100 }
 101
 102 static int
 103 aoeblk_release(struct inode *inode, struct file *filp)
 104 {
 105         struct aoedev *d;
 106         ulong flags;
 107
 108         d = inode->i_bdev->bd_disk->private_data;
 109
 110         spin_lock_irqsave(&d->lock, flags);
 111
 112         if (--d->nopen == 0) {
 113                 spin_unlock_irqrestore(&d->lock, flags);
 114                 aoecmd_cfg(d->aoemajor, d->aoeminor);
 115                 return 0;
 116         }
 117         spin_unlock_irqrestore(&d->lock, flags);
 118
 119         return 0;
 120 }
 121
 122 static int
 123 aoeblk_make_request(request_queue_t *q, struct bio *bio)
 124 {
 125         struct aoedev *d;
 126         struct buf *buf;
 127         struct sk_buff *sl;
 128         ulong flags;
 129
 130         blk_queue_bounce(q, &bio);
 131
 132         d = bio->bi_bdev->bd_disk->private_data;
 133         buf = mempool_alloc(d->bufpool, GFP_NOIO);
 134         if (buf == NULL) {
 135                 iprintk("buf allocation 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                 iprintk("device %ld.%ld is not up\n", d->aoemajor, d->aoeminor);
 153                 spin_unlock_irqrestore(&d->lock, flags);
 154                 mempool_free(buf, d->bufpool);
 155                 bio_endio(bio, bio->bi_size, -ENXIO);
 156                 return 0;
 157         }
 158
 159         list_add_tail(&buf->bufs, &d->bufq);
 160
 161         aoecmd_work(d);
 162         sl = d->sendq_hd;
 163         d->sendq_hd = d->sendq_tl = NULL;
 164
 165         spin_unlock_irqrestore(&d->lock, flags);
 166         aoenet_xmit(sl);
 167
 168         return 0;
 169 }
 170
 171 static int
 172 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 173 {
 174         struct aoedev *d = bdev->bd_disk->private_data;
 175
 176         if ((d->flags & DEVFL_UP) == 0) {
 177                 eprintk("disk not up\n");
 178                 return -ENODEV;
 179         }
 180
 181         geo->cylinders = d->geo.cylinders;
 182         geo->heads = d->geo.heads;
 183         geo->sectors = d->geo.sectors;
 184         return 0;
 185 }
 186
 187 static struct block_device_operations aoe_bdops = {
 188         .open = aoeblk_open,
 189         .release = aoeblk_release,
 190         .getgeo = aoeblk_getgeo,
 191         .owner = THIS_MODULE,
 192 };
 193
 194 /* alloc_disk and add_disk can sleep */
 195 void
 196 aoeblk_gdalloc(void *vp)
 197 {
 198         struct aoedev *d = vp;
 199         struct gendisk *gd;
 200         ulong flags;
 201
 202         gd = alloc_disk(AOE_PARTITIONS);
 203         if (gd == NULL) {
 204                 eprintk("cannot allocate disk structure for %ld.%ld\n",
 205                         d->aoemajor, d->aoeminor);
 206                 spin_lock_irqsave(&d->lock, flags);
 207                 d->flags &= ~DEVFL_GDALLOC;
 208                 spin_unlock_irqrestore(&d->lock, flags);
 209                 return;
 210         }
 211
 212         d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
 213         if (d->bufpool == NULL) {
 214                 eprintk("cannot allocate bufpool for %ld.%ld\n",
 215                         d->aoemajor, d->aoeminor);
 216                 put_disk(gd);
 217                 spin_lock_irqsave(&d->lock, flags);
 218                 d->flags &= ~DEVFL_GDALLOC;
 219                 spin_unlock_irqrestore(&d->lock, flags);
 220                 return;
 221         }
 222
 223         spin_lock_irqsave(&d->lock, flags);
 224         blk_queue_make_request(&d->blkq, aoeblk_make_request);
 225         gd->major = AOE_MAJOR;
 226         gd->first_minor = d->sysminor * AOE_PARTITIONS;
 227         gd->fops = &aoe_bdops;
 228         gd->private_data = d;
 229         gd->capacity = d->ssize;
 230         snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld",
 231                 d->aoemajor, d->aoeminor);
 232
 233         gd->queue = &d->blkq;
 234         d->gd = gd;
 235         d->flags &= ~DEVFL_GDALLOC;
 236         d->flags |= DEVFL_UP;
 237
 238         spin_unlock_irqrestore(&d->lock, flags);
 239
 240         add_disk(gd);
 241         aoedisk_add_sysfs(d);
 242 }
 243
 244 void
 245 aoeblk_exit(void)
 246 {
 247         kmem_cache_destroy(buf_pool_cache);
 248 }
 249
 250 int __init
 251 aoeblk_init(void)
 252 {
 253         buf_pool_cache = kmem_cache_create("aoe_bufs",
 254                                            sizeof(struct buf),
 255                                            0, 0, NULL, NULL);
 256         if (buf_pool_cache == NULL)
 257                 return -ENOMEM;
 258
 259         return 0;
 260 }
 261