1 /* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */
2 /*
3 * aoeblk.c
4 * block device routines
5 */
6
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
16 static struct kmem_cache *buf_pool_cache;
17
18 static 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 /* I'd rather see nopen exported so we can ditch closewait */
30 }
31 static 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, "%012llx\n", mac_addr(t->addr));
41 }
42 static 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 /* firmware version */
80 static 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
89 static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
90 static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
91 static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
92 static struct device_attribute dev_attr_firmware_version = {
93 .attr = { .name = "firmware-version", .mode = S_IRUGO, .owner = THIS_MODULE },
94 .show = aoedisk_show_fwver,
95 };
96
97 static 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
105 static const struct attribute_group attr_group = {
106 .attrs = aoe_attrs,
107 };
108
109 static int
110 aoedisk_add_sysfs(struct aoedev *d)
111 {
112 return sysfs_create_group(&d->gd->dev.kobj, &attr_group);
113 }
114 void
115 aoedisk_rm_sysfs(struct aoedev *d)
116 {
117 sysfs_remove_group(&d->gd->dev.kobj, &attr_group);
118 }
119
120 static int
121 aoeblk_open(struct inode *inode, struct file *filp)
122 {
123 struct aoedev *d;
124 ulong flags;
125
126 d = inode->i_bdev->bd_disk->private_data;
127
128 spin_lock_irqsave(&d->lock, flags);
129 if (d->flags & DEVFL_UP) {
130 d->nopen++;
131 spin_unlock_irqrestore(&d->lock, flags);
132 return 0;
133 }
134 spin_unlock_irqrestore(&d->lock, flags);
135 return -ENODEV;
136 }
137
138 static int
139 aoeblk_release(struct inode *inode, struct file *filp)
140 {
141 struct aoedev *d;
142 ulong flags;
143
144 d = inode->i_bdev->bd_disk->private_data;
145
146 spin_lock_irqsave(&d->lock, flags);
147
148 if (--d->nopen == 0) {
149 spin_unlock_irqrestore(&d->lock, flags);
150 aoecmd_cfg(d->aoemajor, d->aoeminor);
151 return 0;
152 }
153 spin_unlock_irqrestore(&d->lock, flags);
154
155 return 0;
156 }
157
158 static int
159 aoeblk_make_request(struct request_queue *q, struct bio *bio)
160 {
161 struct aoedev *d;
162 struct buf *buf;
163 struct sk_buff *sl;
164 ulong flags;
165
166 blk_queue_bounce(q, &bio);
167
168 if (bio == NULL) {
169 printk(KERN_ERR "aoe: bio is NULL\n");
170 BUG();
171 return 0;
172 }
173 d = bio->bi_bdev->bd_disk->private_data;
174 if (d == NULL) {
175 printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n");
176 BUG();
177 bio_endio(bio, -ENXIO);
178 return 0;
179 } else if (bio->bi_io_vec == NULL) {
180 printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
181 BUG();
182 bio_endio(bio, -ENXIO);
183 return 0;
184 }
185 buf = mempool_alloc(d->bufpool, GFP_NOIO);
186 if (buf == NULL) {
187 printk(KERN_INFO "aoe: buf allocation failure\n");
188 bio_endio(bio, -ENOMEM);
189 return 0;
190 }
191 memset(buf, 0, sizeof(*buf));
192 INIT_LIST_HEAD(&buf->bufs);
193 buf->stime = jiffies;
194 buf->bio = bio;
195 buf->resid = bio->bi_size;
196 buf->sector = bio->bi_sector;
197 buf->bv = &bio->bi_io_vec[bio->bi_idx];
198 buf->bv_resid = buf->bv->bv_len;
199 WARN_ON(buf->bv_resid == 0);
200 buf->bv_off = buf->bv->bv_offset;
201
202 spin_lock_irqsave(&d->lock, flags);
203
204 if ((d->flags & DEVFL_UP) == 0) {
205 printk(KERN_INFO "aoe: device %ld.%d is not up\n",
206 d->aoemajor, d->aoeminor);
207 spin_unlock_irqrestore(&d->lock, flags);
208 mempool_free(buf, d->bufpool);
209 bio_endio(bio, -ENXIO);
210 return 0;
211 }
212
213 list_add_tail(&buf->bufs, &d->bufq);
214
215 aoecmd_work(d);
216 sl = d->sendq_hd;
217 d->sendq_hd = d->sendq_tl = NULL;
218
219 spin_unlock_irqrestore(&d->lock, flags);
220 aoenet_xmit(sl);
221
222 return 0;
223 }
224
225 static int
226 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
227 {
228 struct aoedev *d = bdev->bd_disk->private_data;
229
230 if ((d->flags & DEVFL_UP) == 0) {
231 printk(KERN_ERR "aoe: disk not up\n");
232 return -ENODEV;
233 }
234
235 geo->cylinders = d->geo.cylinders;
236 geo->heads = d->geo.heads;
237 geo->sectors = d->geo.sectors;
238 return 0;
239 }
240
241 static struct block_device_operations aoe_bdops = {
242 .open = aoeblk_open,
243 .release = aoeblk_release,
244 .getgeo = aoeblk_getgeo,
245 .owner = THIS_MODULE,
246 };
247
248 /* alloc_disk and add_disk can sleep */
249 void
250 aoeblk_gdalloc(void *vp)
251 {
252 struct aoedev *d = vp;
253 struct gendisk *gd;
254 ulong flags;
255
256 gd = alloc_disk(AOE_PARTITIONS);
257 if (gd == NULL) {
258 printk(KERN_ERR
259 "aoe: cannot allocate disk structure for %ld.%d\n",
260 d->aoemajor, d->aoeminor);
261 goto err;
262 }
263
264 d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
265 if (d->bufpool == NULL) {
266 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
267 d->aoemajor, d->aoeminor);
268 goto err_disk;
269 }
270
271 blk_queue_make_request(&d->blkq, aoeblk_make_request);
272 if (bdi_init(&d->blkq.backing_dev_info))
273 goto err_mempool;
274 spin_lock_irqsave(&d->lock, flags);
275 gd->major = AOE_MAJOR;
276 gd->first_minor = d->sysminor * AOE_PARTITIONS;
277 gd->fops = &aoe_bdops;
278 gd->private_data = d;
279 gd->capacity = d->ssize;
280 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
281 d->aoemajor, d->aoeminor);
282
283 gd->queue = &d->blkq;
284 d->gd = gd;
285 d->flags &= ~DEVFL_GDALLOC;
286 d->flags |= DEVFL_UP;
287
288 spin_unlock_irqrestore(&d->lock, flags);
289
290 add_disk(gd);
291 aoedisk_add_sysfs(d);
292 return;
293
294 err_mempool:
295 mempool_destroy(d->bufpool);
296 err_disk:
297 put_disk(gd);
298 err:
299 spin_lock_irqsave(&d->lock, flags);
300 d->flags &= ~DEVFL_GDALLOC;
301 spin_unlock_irqrestore(&d->lock, flags);
302 }
303
304 void
305 aoeblk_exit(void)
306 {
307 kmem_cache_destroy(buf_pool_cache);
308 }
309
310 int __init
311 aoeblk_init(void)
312 {
313 buf_pool_cache = kmem_cache_create("aoe_bufs",
314 sizeof(struct buf),
315 0, 0, NULL);
316 if (buf_pool_cache == NULL)
317 return -ENOMEM;
318
319 return 0;
320 }
321
322
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