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1/* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */
2/*
3 * aoeblk.c
4 * block device routines
5 */
6
7#include <linux/kernel.h>
8#include <linux/hdreg.h>
9#include <linux/blkdev.h>
10#include <linux/backing-dev.h>
11#include <linux/fs.h>
12#include <linux/ioctl.h>
13#include <linux/slab.h>
14#include <linux/ratelimit.h>
15#include <linux/genhd.h>
16#include <linux/netdevice.h>
17#include <linux/mutex.h>
18#include <linux/export.h>
19#include "aoe.h"
20
21static DEFINE_MUTEX(aoeblk_mutex);
22static struct kmem_cache *buf_pool_cache;
23
24static ssize_t aoedisk_show_state(struct device *dev,
25 struct device_attribute *attr, char *page)
26{
27 struct gendisk *disk = dev_to_disk(dev);
28 struct aoedev *d = disk->private_data;
29
30 return snprintf(page, PAGE_SIZE,
31 "%s%s\n",
32 (d->flags & DEVFL_UP) ? "up" : "down",
33 (d->flags & DEVFL_KICKME) ? ",kickme" :
34 (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
35 /* I'd rather see nopen exported so we can ditch closewait */
36}
37static ssize_t aoedisk_show_mac(struct device *dev,
38 struct device_attribute *attr, char *page)
39{
40 struct gendisk *disk = dev_to_disk(dev);
41 struct aoedev *d = disk->private_data;
42 struct aoetgt *t = d->targets[0];
43
44 if (t == NULL)
45 return snprintf(page, PAGE_SIZE, "none\n");
46 return snprintf(page, PAGE_SIZE, "%pm\n", t->addr);
47}
48static ssize_t aoedisk_show_netif(struct device *dev,
49 struct device_attribute *attr, char *page)
50{
51 struct gendisk *disk = dev_to_disk(dev);
52 struct aoedev *d = disk->private_data;
53 struct net_device *nds[8], **nd, **nnd, **ne;
54 struct aoetgt **t, **te;
55 struct aoeif *ifp, *e;
56 char *p;
57
58 memset(nds, 0, sizeof nds);
59 nd = nds;
60 ne = nd + ARRAY_SIZE(nds);
61 t = d->targets;
62 te = t + NTARGETS;
63 for (; t < te && *t; t++) {
64 ifp = (*t)->ifs;
65 e = ifp + NAOEIFS;
66 for (; ifp < e && ifp->nd; ifp++) {
67 for (nnd = nds; nnd < nd; nnd++)
68 if (*nnd == ifp->nd)
69 break;
70 if (nnd == nd && nd != ne)
71 *nd++ = ifp->nd;
72 }
73 }
74
75 ne = nd;
76 nd = nds;
77 if (*nd == NULL)
78 return snprintf(page, PAGE_SIZE, "none\n");
79 for (p = page; nd < ne; nd++)
80 p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
81 p == page ? "" : ",", (*nd)->name);
82 p += snprintf(p, PAGE_SIZE - (p-page), "\n");
83 return p-page;
84}
85/* firmware version */
86static ssize_t aoedisk_show_fwver(struct device *dev,
87 struct device_attribute *attr, char *page)
88{
89 struct gendisk *disk = dev_to_disk(dev);
90 struct aoedev *d = disk->private_data;
91
92 return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
93}
94
95static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
96static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
97static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
98static struct device_attribute dev_attr_firmware_version = {
99 .attr = { .name = "firmware-version", .mode = S_IRUGO },
100 .show = aoedisk_show_fwver,
101};
102
103static struct attribute *aoe_attrs[] = {
104 &dev_attr_state.attr,
105 &dev_attr_mac.attr,
106 &dev_attr_netif.attr,
107 &dev_attr_firmware_version.attr,
108 NULL,
109};
110
111static const struct attribute_group attr_group = {
112 .attrs = aoe_attrs,
113};
114
115static int
116aoedisk_add_sysfs(struct aoedev *d)
117{
118 return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
119}
120void
121aoedisk_rm_sysfs(struct aoedev *d)
122{
123 sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
124}
125
126static int
127aoeblk_open(struct block_device *bdev, fmode_t mode)
128{
129 struct aoedev *d = bdev->bd_disk->private_data;
130 ulong flags;
131
132 mutex_lock(&aoeblk_mutex);
133 spin_lock_irqsave(&d->lock, flags);
134 if (d->flags & DEVFL_UP) {
135 d->nopen++;
136 spin_unlock_irqrestore(&d->lock, flags);
137 mutex_unlock(&aoeblk_mutex);
138 return 0;
139 }
140 spin_unlock_irqrestore(&d->lock, flags);
141 mutex_unlock(&aoeblk_mutex);
142 return -ENODEV;
143}
144
145static int
146aoeblk_release(struct gendisk *disk, fmode_t mode)
147{
148 struct aoedev *d = disk->private_data;
149 ulong flags;
150
151 spin_lock_irqsave(&d->lock, flags);
152
153 if (--d->nopen == 0) {
154 spin_unlock_irqrestore(&d->lock, flags);
155 aoecmd_cfg(d->aoemajor, d->aoeminor);
156 return 0;
157 }
158 spin_unlock_irqrestore(&d->lock, flags);
159
160 return 0;
161}
162
163static void
164aoeblk_make_request(struct request_queue *q, struct bio *bio)
165{
166 struct sk_buff_head queue;
167 struct aoedev *d;
168 struct buf *buf;
169 ulong flags;
170
171 blk_queue_bounce(q, &bio);
172
173 if (bio == NULL) {
174 printk(KERN_ERR "aoe: bio is NULL\n");
175 BUG();
176 return;
177 }
178 d = bio->bi_bdev->bd_disk->private_data;
179 if (d == NULL) {
180 printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n");
181 BUG();
182 bio_endio(bio, -ENXIO);
183 return;
184 } else if (bio->bi_io_vec == NULL) {
185 printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
186 BUG();
187 bio_endio(bio, -ENXIO);
188 return;
189 }
190 buf = mempool_alloc(d->bufpool, GFP_NOIO);
191 if (buf == NULL) {
192 printk(KERN_INFO "aoe: buf allocation failure\n");
193 bio_endio(bio, -ENOMEM);
194 return;
195 }
196 memset(buf, 0, sizeof(*buf));
197 INIT_LIST_HEAD(&buf->bufs);
198 buf->stime = jiffies;
199 buf->bio = bio;
200 buf->resid = bio->bi_size;
201 buf->sector = bio->bi_sector;
202 buf->bv = &bio->bi_io_vec[bio->bi_idx];
203 buf->bv_resid = buf->bv->bv_len;
204 WARN_ON(buf->bv_resid == 0);
205 buf->bv_off = buf->bv->bv_offset;
206
207 spin_lock_irqsave(&d->lock, flags);
208
209 if ((d->flags & DEVFL_UP) == 0) {
210 pr_info_ratelimited("aoe: device %ld.%d is not up\n",
211 d->aoemajor, d->aoeminor);
212 spin_unlock_irqrestore(&d->lock, flags);
213 mempool_free(buf, d->bufpool);
214 bio_endio(bio, -ENXIO);
215 return;
216 }
217
218 list_add_tail(&buf->bufs, &d->bufq);
219
220 aoecmd_work(d);
221 __skb_queue_head_init(&queue);
222 skb_queue_splice_init(&d->sendq, &queue);
223
224 spin_unlock_irqrestore(&d->lock, flags);
225 aoenet_xmit(&queue);
226}
227
228static int
229aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
230{
231 struct aoedev *d = bdev->bd_disk->private_data;
232
233 if ((d->flags & DEVFL_UP) == 0) {
234 printk(KERN_ERR "aoe: disk not up\n");
235 return -ENODEV;
236 }
237
238 geo->cylinders = d->geo.cylinders;
239 geo->heads = d->geo.heads;
240 geo->sectors = d->geo.sectors;
241 return 0;
242}
243
244static const struct block_device_operations aoe_bdops = {
245 .open = aoeblk_open,
246 .release = aoeblk_release,
247 .getgeo = aoeblk_getgeo,
248 .owner = THIS_MODULE,
249};
250
251/* alloc_disk and add_disk can sleep */
252void
253aoeblk_gdalloc(void *vp)
254{
255 struct aoedev *d = vp;
256 struct gendisk *gd;
257 ulong flags;
258
259 gd = alloc_disk(AOE_PARTITIONS);
260 if (gd == NULL) {
261 printk(KERN_ERR
262 "aoe: cannot allocate disk structure for %ld.%d\n",
263 d->aoemajor, d->aoeminor);
264 goto err;
265 }
266
267 d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
268 if (d->bufpool == NULL) {
269 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
270 d->aoemajor, d->aoeminor);
271 goto err_disk;
272 }
273
274 d->blkq = blk_alloc_queue(GFP_KERNEL);
275 if (!d->blkq)
276 goto err_mempool;
277 blk_queue_make_request(d->blkq, aoeblk_make_request);
278 d->blkq->backing_dev_info.name = "aoe";
279 if (bdi_init(&d->blkq->backing_dev_info))
280 goto err_blkq;
281 spin_lock_irqsave(&d->lock, flags);
282 gd->major = AOE_MAJOR;
283 gd->first_minor = d->sysminor * AOE_PARTITIONS;
284 gd->fops = &aoe_bdops;
285 gd->private_data = d;
286 set_capacity(gd, d->ssize);
287 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
288 d->aoemajor, d->aoeminor);
289
290 gd->queue = d->blkq;
291 d->gd = gd;
292 d->flags &= ~DEVFL_GDALLOC;
293 d->flags |= DEVFL_UP;
294
295 spin_unlock_irqrestore(&d->lock, flags);
296
297 add_disk(gd);
298 aoedisk_add_sysfs(d);
299 return;
300
301err_blkq:
302 blk_cleanup_queue(d->blkq);
303 d->blkq = NULL;
304err_mempool:
305 mempool_destroy(d->bufpool);
306err_disk:
307 put_disk(gd);
308err:
309 spin_lock_irqsave(&d->lock, flags);
310 d->flags &= ~DEVFL_GDALLOC;
311 spin_unlock_irqrestore(&d->lock, flags);
312}
313
314void
315aoeblk_exit(void)
316{
317 kmem_cache_destroy(buf_pool_cache);
318}
319
320int __init
321aoeblk_init(void)
322{
323 buf_pool_cache = kmem_cache_create("aoe_bufs",
324 sizeof(struct buf),
325 0, 0, NULL);
326 if (buf_pool_cache == NULL)
327 return -ENOMEM;
328
329 return 0;
330}
331