1 /* Copyright (c) 2006 Coraid, Inc. See COPYING for GPL terms. */
4 * block device routines
7 #include <linux/hdreg.h>
8 #include <linux/blkdev.h>
10 #include <linux/ioctl.h>
11 #include <linux/genhd.h>
12 #include <linux/netdevice.h>
15 static struct kmem_cache *buf_pool_cache;
17 static ssize_t aoedisk_show_state(struct gendisk * disk, char *page)
19 struct aoedev *d = disk->private_data;
21 return snprintf(page, PAGE_SIZE,
23 (d->flags & DEVFL_UP) ? "up" : "down",
24 (d->flags & DEVFL_PAUSE) ? ",paused" :
25 (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
26 /* I'd rather see nopen exported so we can ditch closewait */
28 static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page)
30 struct aoedev *d = disk->private_data;
32 return snprintf(page, PAGE_SIZE, "%012llx\n",
33 (unsigned long long)mac_addr(d->addr));
35 static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page)
37 struct aoedev *d = disk->private_data;
39 return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
41 /* firmware version */
42 static ssize_t aoedisk_show_fwver(struct gendisk * disk, char *page)
44 struct aoedev *d = disk->private_data;
46 return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
49 static struct disk_attribute disk_attr_state = {
50 .attr = {.name = "state", .mode = S_IRUGO },
51 .show = aoedisk_show_state
53 static struct disk_attribute disk_attr_mac = {
54 .attr = {.name = "mac", .mode = S_IRUGO },
55 .show = aoedisk_show_mac
57 static struct disk_attribute disk_attr_netif = {
58 .attr = {.name = "netif", .mode = S_IRUGO },
59 .show = aoedisk_show_netif
61 static struct disk_attribute disk_attr_fwver = {
62 .attr = {.name = "firmware-version", .mode = S_IRUGO },
63 .show = aoedisk_show_fwver
66 static struct attribute *aoe_attrs[] = {
67 &disk_attr_state.attr,
69 &disk_attr_netif.attr,
70 &disk_attr_fwver.attr,
74 static const struct attribute_group attr_group = {
79 aoedisk_add_sysfs(struct aoedev *d)
81 return sysfs_create_group(&d->gd->kobj, &attr_group);
84 aoedisk_rm_sysfs(struct aoedev *d)
86 sysfs_remove_group(&d->gd->kobj, &attr_group);
90 aoeblk_open(struct inode *inode, struct file *filp)
95 d = inode->i_bdev->bd_disk->private_data;
97 spin_lock_irqsave(&d->lock, flags);
98 if (d->flags & DEVFL_UP) {
100 spin_unlock_irqrestore(&d->lock, flags);
103 spin_unlock_irqrestore(&d->lock, flags);
108 aoeblk_release(struct inode *inode, struct file *filp)
113 d = inode->i_bdev->bd_disk->private_data;
115 spin_lock_irqsave(&d->lock, flags);
117 if (--d->nopen == 0) {
118 spin_unlock_irqrestore(&d->lock, flags);
119 aoecmd_cfg(d->aoemajor, d->aoeminor);
122 spin_unlock_irqrestore(&d->lock, flags);
128 aoeblk_make_request(request_queue_t *q, struct bio *bio)
135 blk_queue_bounce(q, &bio);
137 d = bio->bi_bdev->bd_disk->private_data;
138 buf = mempool_alloc(d->bufpool, GFP_NOIO);
140 printk(KERN_INFO "aoe: buf allocation failure\n");
141 bio_endio(bio, bio->bi_size, -ENOMEM);
144 memset(buf, 0, sizeof(*buf));
145 INIT_LIST_HEAD(&buf->bufs);
146 buf->start_time = jiffies;
148 buf->resid = bio->bi_size;
149 buf->sector = bio->bi_sector;
150 buf->bv = &bio->bi_io_vec[bio->bi_idx];
151 WARN_ON(buf->bv->bv_len == 0);
152 buf->bv_resid = buf->bv->bv_len;
153 buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset;
155 spin_lock_irqsave(&d->lock, flags);
157 if ((d->flags & DEVFL_UP) == 0) {
158 printk(KERN_INFO "aoe: device %ld.%ld is not up\n",
159 d->aoemajor, d->aoeminor);
160 spin_unlock_irqrestore(&d->lock, flags);
161 mempool_free(buf, d->bufpool);
162 bio_endio(bio, bio->bi_size, -ENXIO);
166 list_add_tail(&buf->bufs, &d->bufq);
170 d->sendq_hd = d->sendq_tl = NULL;
172 spin_unlock_irqrestore(&d->lock, flags);
179 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
181 struct aoedev *d = bdev->bd_disk->private_data;
183 if ((d->flags & DEVFL_UP) == 0) {
184 printk(KERN_ERR "aoe: disk not up\n");
188 geo->cylinders = d->geo.cylinders;
189 geo->heads = d->geo.heads;
190 geo->sectors = d->geo.sectors;
194 static struct block_device_operations aoe_bdops = {
196 .release = aoeblk_release,
197 .getgeo = aoeblk_getgeo,
198 .owner = THIS_MODULE,
201 /* alloc_disk and add_disk can sleep */
203 aoeblk_gdalloc(void *vp)
205 struct aoedev *d = vp;
209 gd = alloc_disk(AOE_PARTITIONS);
211 printk(KERN_ERR "aoe: cannot allocate disk structure for %ld.%ld\n",
212 d->aoemajor, d->aoeminor);
213 spin_lock_irqsave(&d->lock, flags);
214 d->flags &= ~DEVFL_GDALLOC;
215 spin_unlock_irqrestore(&d->lock, flags);
219 d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
220 if (d->bufpool == NULL) {
221 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%ld\n",
222 d->aoemajor, d->aoeminor);
224 spin_lock_irqsave(&d->lock, flags);
225 d->flags &= ~DEVFL_GDALLOC;
226 spin_unlock_irqrestore(&d->lock, flags);
230 spin_lock_irqsave(&d->lock, flags);
231 blk_queue_make_request(&d->blkq, aoeblk_make_request);
232 gd->major = AOE_MAJOR;
233 gd->first_minor = d->sysminor * AOE_PARTITIONS;
234 gd->fops = &aoe_bdops;
235 gd->private_data = d;
236 gd->capacity = d->ssize;
237 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld",
238 d->aoemajor, d->aoeminor);
240 gd->queue = &d->blkq;
242 d->flags &= ~DEVFL_GDALLOC;
243 d->flags |= DEVFL_UP;
245 spin_unlock_irqrestore(&d->lock, flags);
248 aoedisk_add_sysfs(d);
254 kmem_cache_destroy(buf_pool_cache);
260 buf_pool_cache = kmem_cache_create("aoe_bufs",
263 if (buf_pool_cache == NULL)