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);
40 /* firmware version */
41 static ssize_t aoedisk_show_fwver(struct gendisk * disk, char *page)
43 struct aoedev *d = disk->private_data;
45 return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
48 static struct disk_attribute disk_attr_state = {
49 .attr = {.name = "state", .mode = S_IRUGO },
50 .show = aoedisk_show_state
52 static struct disk_attribute disk_attr_mac = {
53 .attr = {.name = "mac", .mode = S_IRUGO },
54 .show = aoedisk_show_mac
56 static struct disk_attribute disk_attr_netif = {
57 .attr = {.name = "netif", .mode = S_IRUGO },
58 .show = aoedisk_show_netif
60 static struct disk_attribute disk_attr_fwver = {
61 .attr = {.name = "firmware-version", .mode = S_IRUGO },
62 .show = aoedisk_show_fwver
66 aoedisk_add_sysfs(struct aoedev *d)
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);
74 aoedisk_rm_sysfs(struct aoedev *d)
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");
83 aoeblk_open(struct inode *inode, struct file *filp)
88 d = inode->i_bdev->bd_disk->private_data;
90 spin_lock_irqsave(&d->lock, flags);
91 if (d->flags & DEVFL_UP) {
93 spin_unlock_irqrestore(&d->lock, flags);
96 spin_unlock_irqrestore(&d->lock, flags);
101 aoeblk_release(struct inode *inode, struct file *filp)
106 d = inode->i_bdev->bd_disk->private_data;
108 spin_lock_irqsave(&d->lock, flags);
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);
116 spin_unlock_irqrestore(&d->lock, flags);
122 aoeblk_make_request(request_queue_t *q, struct bio *bio)
129 blk_queue_bounce(q, &bio);
131 d = bio->bi_bdev->bd_disk->private_data;
132 buf = mempool_alloc(d->bufpool, GFP_NOIO);
134 printk(KERN_INFO "aoe: aoeblk_make_request: buf allocation "
136 bio_endio(bio, bio->bi_size, -ENOMEM);
139 memset(buf, 0, sizeof(*buf));
140 INIT_LIST_HEAD(&buf->bufs);
141 buf->start_time = jiffies;
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;
149 spin_lock_irqsave(&d->lock, flags);
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);
160 list_add_tail(&buf->bufs, &d->bufq);
164 d->sendq_hd = d->sendq_tl = NULL;
166 spin_unlock_irqrestore(&d->lock, flags);
172 /* This ioctl implementation expects userland to have the device node
173 * permissions set so that only priviledged users can open an aoe
174 * block device directly.
177 aoeblk_ioctl(struct inode *inode, struct file *filp, uint cmd, ulong arg)
184 d = inode->i_bdev->bd_disk->private_data;
185 if ((d->flags & DEVFL_UP) == 0) {
186 printk(KERN_ERR "aoe: aoeblk_ioctl: disk not up\n");
190 if (cmd == HDIO_GETGEO) {
191 d->geo.start = get_start_sect(inode->i_bdev);
192 if (!copy_to_user((void __user *) arg, &d->geo, sizeof d->geo))
196 printk(KERN_INFO "aoe: aoeblk_ioctl: unknown ioctl %d\n", cmd);
200 static struct block_device_operations aoe_bdops = {
202 .release = aoeblk_release,
203 .ioctl = aoeblk_ioctl,
204 .owner = THIS_MODULE,
207 /* alloc_disk and add_disk can sleep */
209 aoeblk_gdalloc(void *vp)
211 struct aoedev *d = vp;
215 gd = alloc_disk(AOE_PARTITIONS);
217 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate disk "
218 "structure for %ld.%ld\n", d->aoemajor, d->aoeminor);
219 spin_lock_irqsave(&d->lock, flags);
220 d->flags &= ~DEVFL_WORKON;
221 spin_unlock_irqrestore(&d->lock, flags);
225 d->bufpool = mempool_create(MIN_BUFS,
226 mempool_alloc_slab, mempool_free_slab,
228 if (d->bufpool == NULL) {
229 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool "
230 "for %ld.%ld\n", d->aoemajor, d->aoeminor);
232 spin_lock_irqsave(&d->lock, flags);
233 d->flags &= ~DEVFL_WORKON;
234 spin_unlock_irqrestore(&d->lock, flags);
238 spin_lock_irqsave(&d->lock, flags);
239 blk_queue_make_request(&d->blkq, aoeblk_make_request);
240 gd->major = AOE_MAJOR;
241 gd->first_minor = d->sysminor * AOE_PARTITIONS;
242 gd->fops = &aoe_bdops;
243 gd->private_data = d;
244 gd->capacity = d->ssize;
245 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld",
246 d->aoemajor, d->aoeminor);
248 gd->queue = &d->blkq;
250 d->flags &= ~DEVFL_WORKON;
251 d->flags |= DEVFL_UP;
253 spin_unlock_irqrestore(&d->lock, flags);
256 aoedisk_add_sysfs(d);
258 printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu "
259 "sectors\n", (unsigned long long)mac_addr(d->addr),
260 d->aoemajor, d->aoeminor,
261 d->fw_ver, (long long)d->ssize);
267 kmem_cache_destroy(buf_pool_cache);
273 buf_pool_cache = kmem_cache_create("aoe_bufs",
276 if (buf_pool_cache == NULL)