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7#include <linux/hdreg.h>
8#include <linux/blkdev.h>
9#include <linux/backing-dev.h>
10#include <linux/fs.h>
11#include <linux/ioctl.h>
12#include <linux/genhd.h>
13#include <linux/netdevice.h>
14#include "aoe.h"
15
16static struct kmem_cache *buf_pool_cache;
17
18static ssize_t aoedisk_show_state(struct device *dev,
19 struct device_attribute *attr, char *page)
20{
21 struct gendisk *disk = dev_to_disk(dev);
22 struct aoedev *d = disk->private_data;
23
24 return snprintf(page, PAGE_SIZE,
25 "%s%s\n",
26 (d->flags & DEVFL_UP) ? "up" : "down",
27 (d->flags & DEVFL_KICKME) ? ",kickme" :
28 (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
29
30}
31static ssize_t aoedisk_show_mac(struct device *dev,
32 struct device_attribute *attr, char *page)
33{
34 struct gendisk *disk = dev_to_disk(dev);
35 struct aoedev *d = disk->private_data;
36 struct aoetgt *t = d->targets[0];
37
38 if (t == NULL)
39 return snprintf(page, PAGE_SIZE, "none\n");
40 return snprintf(page, PAGE_SIZE, "%pm\n", t->addr);
41}
42static ssize_t aoedisk_show_netif(struct device *dev,
43 struct device_attribute *attr, char *page)
44{
45 struct gendisk *disk = dev_to_disk(dev);
46 struct aoedev *d = disk->private_data;
47 struct net_device *nds[8], **nd, **nnd, **ne;
48 struct aoetgt **t, **te;
49 struct aoeif *ifp, *e;
50 char *p;
51
52 memset(nds, 0, sizeof nds);
53 nd = nds;
54 ne = nd + ARRAY_SIZE(nds);
55 t = d->targets;
56 te = t + NTARGETS;
57 for (; t < te && *t; t++) {
58 ifp = (*t)->ifs;
59 e = ifp + NAOEIFS;
60 for (; ifp < e && ifp->nd; ifp++) {
61 for (nnd = nds; nnd < nd; nnd++)
62 if (*nnd == ifp->nd)
63 break;
64 if (nnd == nd && nd != ne)
65 *nd++ = ifp->nd;
66 }
67 }
68
69 ne = nd;
70 nd = nds;
71 if (*nd == NULL)
72 return snprintf(page, PAGE_SIZE, "none\n");
73 for (p = page; nd < ne; nd++)
74 p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
75 p == page ? "" : ",", (*nd)->name);
76 p += snprintf(p, PAGE_SIZE - (p-page), "\n");
77 return p-page;
78}
79
80static ssize_t aoedisk_show_fwver(struct device *dev,
81 struct device_attribute *attr, char *page)
82{
83 struct gendisk *disk = dev_to_disk(dev);
84 struct aoedev *d = disk->private_data;
85
86 return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
87}
88
89static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
90static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
91static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
92static struct device_attribute dev_attr_firmware_version = {
93 .attr = { .name = "firmware-version", .mode = S_IRUGO },
94 .show = aoedisk_show_fwver,
95};
96
97static struct attribute *aoe_attrs[] = {
98 &dev_attr_state.attr,
99 &dev_attr_mac.attr,
100 &dev_attr_netif.attr,
101 &dev_attr_firmware_version.attr,
102 NULL,
103};
104
105static const struct attribute_group attr_group = {
106 .attrs = aoe_attrs,
107};
108
109static int
110aoedisk_add_sysfs(struct aoedev *d)
111{
112 return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
113}
114void
115aoedisk_rm_sysfs(struct aoedev *d)
116{
117 sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
118}
119
120static int
121aoeblk_open(struct block_device *bdev, fmode_t mode)
122{
123 struct aoedev *d = bdev->bd_disk->private_data;
124 ulong flags;
125
126 spin_lock_irqsave(&d->lock, flags);
127 if (d->flags & DEVFL_UP) {
128 d->nopen++;
129 spin_unlock_irqrestore(&d->lock, flags);
130 return 0;
131 }
132 spin_unlock_irqrestore(&d->lock, flags);
133 return -ENODEV;
134}
135
136static int
137aoeblk_release(struct gendisk *disk, fmode_t mode)
138{
139 struct aoedev *d = disk->private_data;
140 ulong flags;
141
142 spin_lock_irqsave(&d->lock, flags);
143
144 if (--d->nopen == 0) {
145 spin_unlock_irqrestore(&d->lock, flags);
146 aoecmd_cfg(d->aoemajor, d->aoeminor);
147 return 0;
148 }
149 spin_unlock_irqrestore(&d->lock, flags);
150
151 return 0;
152}
153
154static int
155aoeblk_make_request(struct request_queue *q, struct bio *bio)
156{
157 struct sk_buff_head queue;
158 struct aoedev *d;
159 struct buf *buf;
160 ulong flags;
161
162 blk_queue_bounce(q, &bio);
163
164 if (bio == NULL) {
165 printk(KERN_ERR "aoe: bio is NULL\n");
166 BUG();
167 return 0;
168 }
169 d = bio->bi_bdev->bd_disk->private_data;
170 if (d == NULL) {
171 printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n");
172 BUG();
173 bio_endio(bio, -ENXIO);
174 return 0;
175 } else if (bio_rw_flagged(bio, BIO_RW_BARRIER)) {
176 bio_endio(bio, -EOPNOTSUPP);
177 return 0;
178 } else if (bio->bi_io_vec == NULL) {
179 printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
180 BUG();
181 bio_endio(bio, -ENXIO);
182 return 0;
183 }
184 buf = mempool_alloc(d->bufpool, GFP_NOIO);
185 if (buf == NULL) {
186 printk(KERN_INFO "aoe: buf allocation failure\n");
187 bio_endio(bio, -ENOMEM);
188 return 0;
189 }
190 memset(buf, 0, sizeof(*buf));
191 INIT_LIST_HEAD(&buf->bufs);
192 buf->stime = jiffies;
193 buf->bio = bio;
194 buf->resid = bio->bi_size;
195 buf->sector = bio->bi_sector;
196 buf->bv = &bio->bi_io_vec[bio->bi_idx];
197 buf->bv_resid = buf->bv->bv_len;
198 WARN_ON(buf->bv_resid == 0);
199 buf->bv_off = buf->bv->bv_offset;
200
201 spin_lock_irqsave(&d->lock, flags);
202
203 if ((d->flags & DEVFL_UP) == 0) {
204 printk(KERN_INFO "aoe: device %ld.%d is not up\n",
205 d->aoemajor, d->aoeminor);
206 spin_unlock_irqrestore(&d->lock, flags);
207 mempool_free(buf, d->bufpool);
208 bio_endio(bio, -ENXIO);
209 return 0;
210 }
211
212 list_add_tail(&buf->bufs, &d->bufq);
213
214 aoecmd_work(d);
215 __skb_queue_head_init(&queue);
216 skb_queue_splice_init(&d->sendq, &queue);
217
218 spin_unlock_irqrestore(&d->lock, flags);
219 aoenet_xmit(&queue);
220
221 return 0;
222}
223
224static int
225aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
226{
227 struct aoedev *d = bdev->bd_disk->private_data;
228
229 if ((d->flags & DEVFL_UP) == 0) {
230 printk(KERN_ERR "aoe: disk not up\n");
231 return -ENODEV;
232 }
233
234 geo->cylinders = d->geo.cylinders;
235 geo->heads = d->geo.heads;
236 geo->sectors = d->geo.sectors;
237 return 0;
238}
239
240static const struct block_device_operations aoe_bdops = {
241 .open = aoeblk_open,
242 .release = aoeblk_release,
243 .getgeo = aoeblk_getgeo,
244 .owner = THIS_MODULE,
245};
246
247
248void
249aoeblk_gdalloc(void *vp)
250{
251 struct aoedev *d = vp;
252 struct gendisk *gd;
253 ulong flags;
254
255 gd = alloc_disk(AOE_PARTITIONS);
256 if (gd == NULL) {
257 printk(KERN_ERR
258 "aoe: cannot allocate disk structure for %ld.%d\n",
259 d->aoemajor, d->aoeminor);
260 goto err;
261 }
262
263 d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
264 if (d->bufpool == NULL) {
265 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
266 d->aoemajor, d->aoeminor);
267 goto err_disk;
268 }
269
270 d->blkq = blk_alloc_queue(GFP_KERNEL);
271 if (!d->blkq)
272 goto err_mempool;
273 blk_queue_make_request(d->blkq, aoeblk_make_request);
274 d->blkq->backing_dev_info.name = "aoe";
275 if (bdi_init(&d->blkq->backing_dev_info))
276 goto err_blkq;
277 spin_lock_irqsave(&d->lock, flags);
278 gd->major = AOE_MAJOR;
279 gd->first_minor = d->sysminor * AOE_PARTITIONS;
280 gd->fops = &aoe_bdops;
281 gd->private_data = d;
282 set_capacity(gd, d->ssize);
283 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
284 d->aoemajor, d->aoeminor);
285
286 gd->queue = d->blkq;
287 d->gd = gd;
288 d->flags &= ~DEVFL_GDALLOC;
289 d->flags |= DEVFL_UP;
290
291 spin_unlock_irqrestore(&d->lock, flags);
292
293 add_disk(gd);
294 aoedisk_add_sysfs(d);
295 return;
296
297err_blkq:
298 blk_cleanup_queue(d->blkq);
299 d->blkq = NULL;
300err_mempool:
301 mempool_destroy(d->bufpool);
302err_disk:
303 put_disk(gd);
304err:
305 spin_lock_irqsave(&d->lock, flags);
306 d->flags &= ~DEVFL_GDALLOC;
307 spin_unlock_irqrestore(&d->lock, flags);
308}
309
310void
311aoeblk_exit(void)
312{
313 kmem_cache_destroy(buf_pool_cache);
314}
315
316int __init
317aoeblk_init(void)
318{
319 buf_pool_cache = kmem_cache_create("aoe_bufs",
320 sizeof(struct buf),
321 0, 0, NULL);
322 if (buf_pool_cache == NULL)
323 return -ENOMEM;
324
325 return 0;
326}
327
328
