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
aoedisk_show_state(struct device * dev,struct device_attribute * attr,char * page)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 }
aoedisk_show_mac(struct device * dev,struct device_attribute * attr,char * page)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, "%pm\n", t->addr);
41 }
aoedisk_show_netif(struct device * dev,struct device_attribute * attr,char * page)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 */
aoedisk_show_fwver(struct device * dev,struct device_attribute * attr,char * page)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 },
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
aoedisk_add_sysfs(struct aoedev * d)110 aoedisk_add_sysfs(struct aoedev *d)
111 {
112 return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
113 }
114 void
aoedisk_rm_sysfs(struct aoedev * d)115 aoedisk_rm_sysfs(struct aoedev *d)
116 {
117 sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
118 }
119
120 static int
aoeblk_open(struct block_device * bdev,fmode_t mode)121 aoeblk_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
136 static int
aoeblk_release(struct gendisk * disk,fmode_t mode)137 aoeblk_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
154 static int
aoeblk_make_request(struct request_queue * q,struct bio * bio)155 aoeblk_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->bi_io_vec == NULL) {
176 printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
177 BUG();
178 bio_endio(bio, -ENXIO);
179 return 0;
180 }
181 buf = mempool_alloc(d->bufpool, GFP_NOIO);
182 if (buf == NULL) {
183 printk(KERN_INFO "aoe: buf allocation failure\n");
184 bio_endio(bio, -ENOMEM);
185 return 0;
186 }
187 memset(buf, 0, sizeof(*buf));
188 INIT_LIST_HEAD(&buf->bufs);
189 buf->stime = jiffies;
190 buf->bio = bio;
191 buf->resid = bio->bi_size;
192 buf->sector = bio->bi_sector;
193 buf->bv = &bio->bi_io_vec[bio->bi_idx];
194 buf->bv_resid = buf->bv->bv_len;
195 WARN_ON(buf->bv_resid == 0);
196 buf->bv_off = buf->bv->bv_offset;
197
198 spin_lock_irqsave(&d->lock, flags);
199
200 if ((d->flags & DEVFL_UP) == 0) {
201 printk(KERN_INFO "aoe: device %ld.%d is not up\n",
202 d->aoemajor, d->aoeminor);
203 spin_unlock_irqrestore(&d->lock, flags);
204 mempool_free(buf, d->bufpool);
205 bio_endio(bio, -ENXIO);
206 return 0;
207 }
208
209 list_add_tail(&buf->bufs, &d->bufq);
210
211 aoecmd_work(d);
212 __skb_queue_head_init(&queue);
213 skb_queue_splice_init(&d->sendq, &queue);
214
215 spin_unlock_irqrestore(&d->lock, flags);
216 aoenet_xmit(&queue);
217
218 return 0;
219 }
220
221 static int
aoeblk_getgeo(struct block_device * bdev,struct hd_geometry * geo)222 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
223 {
224 struct aoedev *d = bdev->bd_disk->private_data;
225
226 if ((d->flags & DEVFL_UP) == 0) {
227 printk(KERN_ERR "aoe: disk not up\n");
228 return -ENODEV;
229 }
230
231 geo->cylinders = d->geo.cylinders;
232 geo->heads = d->geo.heads;
233 geo->sectors = d->geo.sectors;
234 return 0;
235 }
236
237 static struct block_device_operations aoe_bdops = {
238 .open = aoeblk_open,
239 .release = aoeblk_release,
240 .getgeo = aoeblk_getgeo,
241 .owner = THIS_MODULE,
242 };
243
244 /* alloc_disk and add_disk can sleep */
245 void
aoeblk_gdalloc(void * vp)246 aoeblk_gdalloc(void *vp)
247 {
248 struct aoedev *d = vp;
249 struct gendisk *gd;
250 ulong flags;
251
252 gd = alloc_disk(AOE_PARTITIONS);
253 if (gd == NULL) {
254 printk(KERN_ERR
255 "aoe: cannot allocate disk structure for %ld.%d\n",
256 d->aoemajor, d->aoeminor);
257 goto err;
258 }
259
260 d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
261 if (d->bufpool == NULL) {
262 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
263 d->aoemajor, d->aoeminor);
264 goto err_disk;
265 }
266
267 blk_queue_make_request(&d->blkq, aoeblk_make_request);
268 if (bdi_init(&d->blkq.backing_dev_info))
269 goto err_mempool;
270 spin_lock_irqsave(&d->lock, flags);
271 gd->major = AOE_MAJOR;
272 gd->first_minor = d->sysminor * AOE_PARTITIONS;
273 gd->fops = &aoe_bdops;
274 gd->private_data = d;
275 set_capacity(gd, d->ssize);
276 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
277 d->aoemajor, d->aoeminor);
278
279 gd->queue = &d->blkq;
280 d->gd = gd;
281 d->flags &= ~DEVFL_GDALLOC;
282 d->flags |= DEVFL_UP;
283
284 spin_unlock_irqrestore(&d->lock, flags);
285
286 add_disk(gd);
287 aoedisk_add_sysfs(d);
288 return;
289
290 err_mempool:
291 mempool_destroy(d->bufpool);
292 err_disk:
293 put_disk(gd);
294 err:
295 spin_lock_irqsave(&d->lock, flags);
296 d->flags &= ~DEVFL_GDALLOC;
297 spin_unlock_irqrestore(&d->lock, flags);
298 }
299
300 void
aoeblk_exit(void)301 aoeblk_exit(void)
302 {
303 kmem_cache_destroy(buf_pool_cache);
304 }
305
306 int __init
aoeblk_init(void)307 aoeblk_init(void)
308 {
309 buf_pool_cache = kmem_cache_create("aoe_bufs",
310 sizeof(struct buf),
311 0, 0, NULL);
312 if (buf_pool_cache == NULL)
313 return -ENOMEM;
314
315 return 0;
316 }
317
318