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1da177e4 LT |
1 | /* Copyright (c) 2004 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/fs.h> | |
10 | #include <linux/ioctl.h> | |
11 | #include <linux/genhd.h> | |
12 | #include <linux/netdevice.h> | |
13 | #include "aoe.h" | |
14 | ||
15 | static kmem_cache_t *buf_pool_cache; | |
16 | ||
17 | /* add attributes for our block devices in sysfs */ | |
18 | static ssize_t aoedisk_show_state(struct gendisk * disk, char *page) | |
19 | { | |
20 | struct aoedev *d = disk->private_data; | |
21 | ||
22 | return snprintf(page, PAGE_SIZE, | |
23 | "%s%s\n", | |
24 | (d->flags & DEVFL_UP) ? "up" : "down", | |
25 | (d->flags & DEVFL_CLOSEWAIT) ? ",closewait" : ""); | |
26 | } | |
27 | static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page) | |
28 | { | |
29 | struct aoedev *d = disk->private_data; | |
30 | ||
31 | return snprintf(page, PAGE_SIZE, "%012llx\n", | |
32 | (unsigned long long)mac_addr(d->addr)); | |
33 | } | |
34 | static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page) | |
35 | { | |
36 | struct aoedev *d = disk->private_data; | |
37 | ||
38 | return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name); | |
39 | } | |
4613ed27 EC |
40 | /* firmware version */ |
41 | static ssize_t aoedisk_show_fwver(struct gendisk * disk, char *page) | |
42 | { | |
43 | struct aoedev *d = disk->private_data; | |
44 | ||
45 | return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver); | |
46 | } | |
1da177e4 LT |
47 | |
48 | static struct disk_attribute disk_attr_state = { | |
49 | .attr = {.name = "state", .mode = S_IRUGO }, | |
50 | .show = aoedisk_show_state | |
51 | }; | |
52 | static struct disk_attribute disk_attr_mac = { | |
53 | .attr = {.name = "mac", .mode = S_IRUGO }, | |
54 | .show = aoedisk_show_mac | |
55 | }; | |
56 | static struct disk_attribute disk_attr_netif = { | |
57 | .attr = {.name = "netif", .mode = S_IRUGO }, | |
58 | .show = aoedisk_show_netif | |
59 | }; | |
4613ed27 EC |
60 | static struct disk_attribute disk_attr_fwver = { |
61 | .attr = {.name = "firmware-version", .mode = S_IRUGO }, | |
62 | .show = aoedisk_show_fwver | |
63 | }; | |
1da177e4 LT |
64 | |
65 | static void | |
66 | aoedisk_add_sysfs(struct aoedev *d) | |
67 | { | |
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); | |
4613ed27 | 71 | sysfs_create_file(&d->gd->kobj, &disk_attr_fwver.attr); |
1da177e4 LT |
72 | } |
73 | void | |
74 | aoedisk_rm_sysfs(struct aoedev *d) | |
75 | { | |
76 | sysfs_remove_link(&d->gd->kobj, "state"); | |
77 | sysfs_remove_link(&d->gd->kobj, "mac"); | |
78 | sysfs_remove_link(&d->gd->kobj, "netif"); | |
4613ed27 | 79 | sysfs_remove_link(&d->gd->kobj, "firmware-version"); |
1da177e4 LT |
80 | } |
81 | ||
82 | static int | |
83 | aoeblk_open(struct inode *inode, struct file *filp) | |
84 | { | |
85 | struct aoedev *d; | |
86 | ulong flags; | |
87 | ||
88 | d = inode->i_bdev->bd_disk->private_data; | |
89 | ||
90 | spin_lock_irqsave(&d->lock, flags); | |
91 | if (d->flags & DEVFL_UP) { | |
92 | d->nopen++; | |
93 | spin_unlock_irqrestore(&d->lock, flags); | |
94 | return 0; | |
95 | } | |
96 | spin_unlock_irqrestore(&d->lock, flags); | |
97 | return -ENODEV; | |
98 | } | |
99 | ||
100 | static int | |
101 | aoeblk_release(struct inode *inode, struct file *filp) | |
102 | { | |
103 | struct aoedev *d; | |
104 | ulong flags; | |
105 | ||
106 | d = inode->i_bdev->bd_disk->private_data; | |
107 | ||
108 | spin_lock_irqsave(&d->lock, flags); | |
109 | ||
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); | |
114 | return 0; | |
115 | } | |
116 | spin_unlock_irqrestore(&d->lock, flags); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static int | |
122 | aoeblk_make_request(request_queue_t *q, struct bio *bio) | |
123 | { | |
124 | struct aoedev *d; | |
125 | struct buf *buf; | |
126 | struct sk_buff *sl; | |
127 | ulong flags; | |
128 | ||
129 | blk_queue_bounce(q, &bio); | |
130 | ||
131 | d = bio->bi_bdev->bd_disk->private_data; | |
132 | buf = mempool_alloc(d->bufpool, GFP_NOIO); | |
133 | if (buf == NULL) { | |
134 | printk(KERN_INFO "aoe: aoeblk_make_request: buf allocation " | |
135 | "failure\n"); | |
136 | bio_endio(bio, bio->bi_size, -ENOMEM); | |
137 | return 0; | |
138 | } | |
139 | memset(buf, 0, sizeof(*buf)); | |
140 | INIT_LIST_HEAD(&buf->bufs); | |
0c6f0e79 | 141 | buf->start_time = jiffies; |
1da177e4 LT |
142 | buf->bio = bio; |
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; | |
148 | ||
149 | spin_lock_irqsave(&d->lock, flags); | |
150 | ||
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); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | list_add_tail(&buf->bufs, &d->bufq); | |
161 | aoecmd_work(d); | |
162 | ||
a4b38364 EC |
163 | sl = d->sendq_hd; |
164 | d->sendq_hd = d->sendq_tl = NULL; | |
1da177e4 LT |
165 | |
166 | spin_unlock_irqrestore(&d->lock, flags); | |
167 | ||
168 | aoenet_xmit(sl); | |
169 | return 0; | |
170 | } | |
171 | ||
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. | |
175 | */ | |
176 | static int | |
177 | aoeblk_ioctl(struct inode *inode, struct file *filp, uint cmd, ulong arg) | |
178 | { | |
179 | struct aoedev *d; | |
180 | ||
181 | if (!arg) | |
182 | return -EINVAL; | |
183 | ||
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"); | |
187 | return -ENODEV; | |
188 | } | |
189 | ||
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)) | |
193 | return 0; | |
194 | return -EFAULT; | |
195 | } | |
196 | printk(KERN_INFO "aoe: aoeblk_ioctl: unknown ioctl %d\n", cmd); | |
197 | return -EINVAL; | |
198 | } | |
199 | ||
200 | static struct block_device_operations aoe_bdops = { | |
201 | .open = aoeblk_open, | |
202 | .release = aoeblk_release, | |
203 | .ioctl = aoeblk_ioctl, | |
204 | .owner = THIS_MODULE, | |
205 | }; | |
206 | ||
207 | /* alloc_disk and add_disk can sleep */ | |
208 | void | |
209 | aoeblk_gdalloc(void *vp) | |
210 | { | |
211 | struct aoedev *d = vp; | |
212 | struct gendisk *gd; | |
213 | ulong flags; | |
214 | ||
215 | gd = alloc_disk(AOE_PARTITIONS); | |
216 | if (gd == NULL) { | |
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); | |
222 | return; | |
223 | } | |
224 | ||
225 | d->bufpool = mempool_create(MIN_BUFS, | |
226 | mempool_alloc_slab, mempool_free_slab, | |
227 | buf_pool_cache); | |
228 | if (d->bufpool == NULL) { | |
229 | printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool " | |
230 | "for %ld.%ld\n", d->aoemajor, d->aoeminor); | |
231 | put_disk(gd); | |
232 | spin_lock_irqsave(&d->lock, flags); | |
233 | d->flags &= ~DEVFL_WORKON; | |
234 | spin_unlock_irqrestore(&d->lock, flags); | |
235 | return; | |
236 | } | |
237 | ||
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); | |
247 | ||
248 | gd->queue = &d->blkq; | |
249 | d->gd = gd; | |
250 | d->flags &= ~DEVFL_WORKON; | |
251 | d->flags |= DEVFL_UP; | |
252 | ||
253 | spin_unlock_irqrestore(&d->lock, flags); | |
254 | ||
255 | add_disk(gd); | |
256 | aoedisk_add_sysfs(d); | |
257 | ||
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); | |
262 | } | |
263 | ||
264 | void | |
265 | aoeblk_exit(void) | |
266 | { | |
267 | kmem_cache_destroy(buf_pool_cache); | |
268 | } | |
269 | ||
270 | int __init | |
271 | aoeblk_init(void) | |
272 | { | |
273 | buf_pool_cache = kmem_cache_create("aoe_bufs", | |
274 | sizeof(struct buf), | |
275 | 0, 0, NULL, NULL); | |
276 | if (buf_pool_cache == NULL) | |
277 | return -ENOMEM; | |
278 | ||
279 | return 0; | |
280 | } | |
281 |