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",
32 (unsigned long long)mac_addr(d->addr));
34 static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page)
36 struct aoedev *d = disk->private_data;
38 return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
41 static struct disk_attribute disk_attr_state = {
42 .attr = {.name = "state", .mode = S_IRUGO },
43 .show = aoedisk_show_state
45 static struct disk_attribute disk_attr_mac = {
46 .attr = {.name = "mac", .mode = S_IRUGO },
47 .show = aoedisk_show_mac
49 static struct disk_attribute disk_attr_netif = {
50 .attr = {.name = "netif", .mode = S_IRUGO },
51 .show = aoedisk_show_netif
55 aoedisk_add_sysfs(struct aoedev *d)
57 sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr);
58 sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr);
59 sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr);
62 aoedisk_rm_sysfs(struct aoedev *d)
64 sysfs_remove_link(&d->gd->kobj, "state");
65 sysfs_remove_link(&d->gd->kobj, "mac");
66 sysfs_remove_link(&d->gd->kobj, "netif");
70 aoeblk_open(struct inode *inode, struct file *filp)
75 d = inode->i_bdev->bd_disk->private_data;
77 spin_lock_irqsave(&d->lock, flags);
78 if (d->flags & DEVFL_UP) {
80 spin_unlock_irqrestore(&d->lock, flags);
83 spin_unlock_irqrestore(&d->lock, flags);
88 aoeblk_release(struct inode *inode, struct file *filp)
93 d = inode->i_bdev->bd_disk->private_data;
95 spin_lock_irqsave(&d->lock, flags);
97 if (--d->nopen == 0 && (d->flags & DEVFL_CLOSEWAIT)) {
98 d->flags &= ~DEVFL_CLOSEWAIT;
99 spin_unlock_irqrestore(&d->lock, flags);
100 aoecmd_cfg(d->aoemajor, d->aoeminor);
103 spin_unlock_irqrestore(&d->lock, flags);
109 aoeblk_make_request(request_queue_t *q, struct bio *bio)
116 blk_queue_bounce(q, &bio);
118 d = bio->bi_bdev->bd_disk->private_data;
119 buf = mempool_alloc(d->bufpool, GFP_NOIO);
121 printk(KERN_INFO "aoe: aoeblk_make_request: buf allocation "
123 bio_endio(bio, bio->bi_size, -ENOMEM);
126 memset(buf, 0, sizeof(*buf));
127 INIT_LIST_HEAD(&buf->bufs);
129 buf->resid = bio->bi_size;
130 buf->sector = bio->bi_sector;
131 buf->bv = buf->bio->bi_io_vec;
132 buf->bv_resid = buf->bv->bv_len;
133 buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset;
135 spin_lock_irqsave(&d->lock, flags);
137 if ((d->flags & DEVFL_UP) == 0) {
138 printk(KERN_INFO "aoe: aoeblk_make_request: device %ld.%ld is not up\n",
139 d->aoemajor, d->aoeminor);
140 spin_unlock_irqrestore(&d->lock, flags);
141 mempool_free(buf, d->bufpool);
142 bio_endio(bio, bio->bi_size, -ENXIO);
146 list_add_tail(&buf->bufs, &d->bufq);
152 spin_unlock_irqrestore(&d->lock, flags);
158 /* This ioctl implementation expects userland to have the device node
159 * permissions set so that only priviledged users can open an aoe
160 * block device directly.
163 aoeblk_ioctl(struct inode *inode, struct file *filp, uint cmd, ulong arg)
170 d = inode->i_bdev->bd_disk->private_data;
171 if ((d->flags & DEVFL_UP) == 0) {
172 printk(KERN_ERR "aoe: aoeblk_ioctl: disk not up\n");
176 if (cmd == HDIO_GETGEO) {
177 d->geo.start = get_start_sect(inode->i_bdev);
178 if (!copy_to_user((void __user *) arg, &d->geo, sizeof d->geo))
182 printk(KERN_INFO "aoe: aoeblk_ioctl: unknown ioctl %d\n", cmd);
186 static struct block_device_operations aoe_bdops = {
188 .release = aoeblk_release,
189 .ioctl = aoeblk_ioctl,
190 .owner = THIS_MODULE,
193 /* alloc_disk and add_disk can sleep */
195 aoeblk_gdalloc(void *vp)
197 struct aoedev *d = vp;
201 gd = alloc_disk(AOE_PARTITIONS);
203 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate disk "
204 "structure for %ld.%ld\n", d->aoemajor, d->aoeminor);
205 spin_lock_irqsave(&d->lock, flags);
206 d->flags &= ~DEVFL_WORKON;
207 spin_unlock_irqrestore(&d->lock, flags);
211 d->bufpool = mempool_create(MIN_BUFS,
212 mempool_alloc_slab, mempool_free_slab,
214 if (d->bufpool == NULL) {
215 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool "
216 "for %ld.%ld\n", d->aoemajor, d->aoeminor);
218 spin_lock_irqsave(&d->lock, flags);
219 d->flags &= ~DEVFL_WORKON;
220 spin_unlock_irqrestore(&d->lock, flags);
224 spin_lock_irqsave(&d->lock, flags);
225 blk_queue_make_request(&d->blkq, aoeblk_make_request);
226 gd->major = AOE_MAJOR;
227 gd->first_minor = d->sysminor * AOE_PARTITIONS;
228 gd->fops = &aoe_bdops;
229 gd->private_data = d;
230 gd->capacity = d->ssize;
231 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld",
232 d->aoemajor, d->aoeminor);
234 gd->queue = &d->blkq;
236 d->flags &= ~DEVFL_WORKON;
237 d->flags |= DEVFL_UP;
239 spin_unlock_irqrestore(&d->lock, flags);
242 aoedisk_add_sysfs(d);
244 printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu "
245 "sectors\n", (unsigned long long)mac_addr(d->addr),
246 d->aoemajor, d->aoeminor,
247 d->fw_ver, (long long)d->ssize);
253 kmem_cache_destroy(buf_pool_cache);
259 buf_pool_cache = kmem_cache_create("aoe_bufs",
262 if (buf_pool_cache == NULL)