1 /* Copyright (c) 2004 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 kmem_cache_t *buf_pool_cache;
17 /* add attributes for our block devices in sysfs */
18 static ssize_t aoedisk_show_state(struct gendisk * disk, char *page)
20 struct aoedev *d = disk->private_data;
22 return snprintf(page, PAGE_SIZE,
24 (d->flags & DEVFL_UP) ? "up" : "down",
25 (d->flags & DEVFL_CLOSEWAIT) ? ",closewait" : "");
27 static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page)
29 struct aoedev *d = disk->private_data;
31 return snprintf(page, PAGE_SIZE, "%012llx\n", mac_addr(d->addr));
33 static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page)
35 struct aoedev *d = disk->private_data;
37 return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
40 static struct disk_attribute disk_attr_state = {
41 .attr = {.name = "state", .mode = S_IRUGO },
42 .show = aoedisk_show_state
44 static struct disk_attribute disk_attr_mac = {
45 .attr = {.name = "mac", .mode = S_IRUGO },
46 .show = aoedisk_show_mac
48 static struct disk_attribute disk_attr_netif = {
49 .attr = {.name = "netif", .mode = S_IRUGO },
50 .show = aoedisk_show_netif
54 aoedisk_add_sysfs(struct aoedev *d)
56 sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr);
57 sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr);
58 sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr);
61 aoedisk_rm_sysfs(struct aoedev *d)
63 sysfs_remove_link(&d->gd->kobj, "state");
64 sysfs_remove_link(&d->gd->kobj, "mac");
65 sysfs_remove_link(&d->gd->kobj, "netif");
69 aoeblk_open(struct inode *inode, struct file *filp)
74 d = inode->i_bdev->bd_disk->private_data;
76 spin_lock_irqsave(&d->lock, flags);
77 if (d->flags & DEVFL_UP) {
79 spin_unlock_irqrestore(&d->lock, flags);
82 spin_unlock_irqrestore(&d->lock, flags);
87 aoeblk_release(struct inode *inode, struct file *filp)
92 d = inode->i_bdev->bd_disk->private_data;
94 spin_lock_irqsave(&d->lock, flags);
96 if (--d->nopen == 0 && (d->flags & DEVFL_CLOSEWAIT)) {
97 d->flags &= ~DEVFL_CLOSEWAIT;
98 spin_unlock_irqrestore(&d->lock, flags);
99 aoecmd_cfg(d->aoemajor, d->aoeminor);
102 spin_unlock_irqrestore(&d->lock, flags);
108 aoeblk_make_request(request_queue_t *q, struct bio *bio)
115 blk_queue_bounce(q, &bio);
117 d = bio->bi_bdev->bd_disk->private_data;
118 buf = mempool_alloc(d->bufpool, GFP_NOIO);
120 printk(KERN_INFO "aoe: aoeblk_make_request: buf allocation "
122 bio_endio(bio, bio->bi_size, -ENOMEM);
125 memset(buf, 0, sizeof(*buf));
126 INIT_LIST_HEAD(&buf->bufs);
128 buf->resid = bio->bi_size;
129 buf->sector = bio->bi_sector;
130 buf->bv = buf->bio->bi_io_vec;
131 buf->bv_resid = buf->bv->bv_len;
132 buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset;
134 spin_lock_irqsave(&d->lock, flags);
136 if ((d->flags & DEVFL_UP) == 0) {
137 printk(KERN_INFO "aoe: aoeblk_make_request: device %ld.%ld is not up\n",
138 d->aoemajor, d->aoeminor);
139 spin_unlock_irqrestore(&d->lock, flags);
140 mempool_free(buf, d->bufpool);
141 bio_endio(bio, bio->bi_size, -ENXIO);
145 list_add_tail(&buf->bufs, &d->bufq);
151 spin_unlock_irqrestore(&d->lock, flags);
157 /* This ioctl implementation expects userland to have the device node
158 * permissions set so that only priviledged users can open an aoe
159 * block device directly.
162 aoeblk_ioctl(struct inode *inode, struct file *filp, uint cmd, ulong arg)
169 d = inode->i_bdev->bd_disk->private_data;
170 if ((d->flags & DEVFL_UP) == 0) {
171 printk(KERN_ERR "aoe: aoeblk_ioctl: disk not up\n");
175 if (cmd == HDIO_GETGEO) {
176 d->geo.start = get_start_sect(inode->i_bdev);
177 if (!copy_to_user((void __user *) arg, &d->geo, sizeof d->geo))
181 printk(KERN_INFO "aoe: aoeblk_ioctl: unknown ioctl %d\n", cmd);
185 static struct block_device_operations aoe_bdops = {
187 .release = aoeblk_release,
188 .ioctl = aoeblk_ioctl,
189 .owner = THIS_MODULE,
192 /* alloc_disk and add_disk can sleep */
194 aoeblk_gdalloc(void *vp)
196 struct aoedev *d = vp;
200 gd = alloc_disk(AOE_PARTITIONS);
202 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate disk "
203 "structure for %ld.%ld\n", d->aoemajor, d->aoeminor);
204 spin_lock_irqsave(&d->lock, flags);
205 d->flags &= ~DEVFL_WORKON;
206 spin_unlock_irqrestore(&d->lock, flags);
210 d->bufpool = mempool_create(MIN_BUFS,
211 mempool_alloc_slab, mempool_free_slab,
213 if (d->bufpool == NULL) {
214 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool "
215 "for %ld.%ld\n", d->aoemajor, d->aoeminor);
217 spin_lock_irqsave(&d->lock, flags);
218 d->flags &= ~DEVFL_WORKON;
219 spin_unlock_irqrestore(&d->lock, flags);
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);
233 gd->queue = &d->blkq;
235 d->flags &= ~DEVFL_WORKON;
236 d->flags |= DEVFL_UP;
238 spin_unlock_irqrestore(&d->lock, flags);
241 aoedisk_add_sysfs(d);
243 printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu "
244 "sectors\n", mac_addr(d->addr), d->aoemajor, d->aoeminor,
245 d->fw_ver, (long long)d->ssize);
251 kmem_cache_destroy(buf_pool_cache);
257 buf_pool_cache = kmem_cache_create("aoe_bufs",
260 if (buf_pool_cache == NULL)