Commit | Line | Data |
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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 | } | |
40 | ||
41 | static struct disk_attribute disk_attr_state = { | |
42 | .attr = {.name = "state", .mode = S_IRUGO }, | |
43 | .show = aoedisk_show_state | |
44 | }; | |
45 | static struct disk_attribute disk_attr_mac = { | |
46 | .attr = {.name = "mac", .mode = S_IRUGO }, | |
47 | .show = aoedisk_show_mac | |
48 | }; | |
49 | static struct disk_attribute disk_attr_netif = { | |
50 | .attr = {.name = "netif", .mode = S_IRUGO }, | |
51 | .show = aoedisk_show_netif | |
52 | }; | |
53 | ||
54 | static void | |
55 | aoedisk_add_sysfs(struct aoedev *d) | |
56 | { | |
57 | sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr); | |
58 | sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr); | |
59 | sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr); | |
60 | } | |
61 | void | |
62 | aoedisk_rm_sysfs(struct aoedev *d) | |
63 | { | |
64 | sysfs_remove_link(&d->gd->kobj, "state"); | |
65 | sysfs_remove_link(&d->gd->kobj, "mac"); | |
66 | sysfs_remove_link(&d->gd->kobj, "netif"); | |
67 | } | |
68 | ||
69 | static int | |
70 | aoeblk_open(struct inode *inode, struct file *filp) | |
71 | { | |
72 | struct aoedev *d; | |
73 | ulong flags; | |
74 | ||
75 | d = inode->i_bdev->bd_disk->private_data; | |
76 | ||
77 | spin_lock_irqsave(&d->lock, flags); | |
78 | if (d->flags & DEVFL_UP) { | |
79 | d->nopen++; | |
80 | spin_unlock_irqrestore(&d->lock, flags); | |
81 | return 0; | |
82 | } | |
83 | spin_unlock_irqrestore(&d->lock, flags); | |
84 | return -ENODEV; | |
85 | } | |
86 | ||
87 | static int | |
88 | aoeblk_release(struct inode *inode, struct file *filp) | |
89 | { | |
90 | struct aoedev *d; | |
91 | ulong flags; | |
92 | ||
93 | d = inode->i_bdev->bd_disk->private_data; | |
94 | ||
95 | spin_lock_irqsave(&d->lock, flags); | |
96 | ||
97 | if (--d->nopen == 0 && (d->flags & DEVFL_CLOSEWAIT)) { | |
98 | d->flags &= ~DEVFL_CLOSEWAIT; | |
99 | spin_unlock_irqrestore(&d->lock, flags); | |
100 | aoecmd_cfg(d->aoemajor, d->aoeminor); | |
101 | return 0; | |
102 | } | |
103 | spin_unlock_irqrestore(&d->lock, flags); | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static int | |
109 | aoeblk_make_request(request_queue_t *q, struct bio *bio) | |
110 | { | |
111 | struct aoedev *d; | |
112 | struct buf *buf; | |
113 | struct sk_buff *sl; | |
114 | ulong flags; | |
115 | ||
116 | blk_queue_bounce(q, &bio); | |
117 | ||
118 | d = bio->bi_bdev->bd_disk->private_data; | |
119 | buf = mempool_alloc(d->bufpool, GFP_NOIO); | |
120 | if (buf == NULL) { | |
121 | printk(KERN_INFO "aoe: aoeblk_make_request: buf allocation " | |
122 | "failure\n"); | |
123 | bio_endio(bio, bio->bi_size, -ENOMEM); | |
124 | return 0; | |
125 | } | |
126 | memset(buf, 0, sizeof(*buf)); | |
127 | INIT_LIST_HEAD(&buf->bufs); | |
128 | buf->bio = bio; | |
129 | buf->resid = bio->bi_size; | |
130 | buf->sector = bio->bi_sector; | |
131 | buf->bv = buf->bio->bi_io_vec; | |
132 | buf->bv_resid = buf->bv->bv_len; | |
133 | buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset; | |
134 | ||
135 | spin_lock_irqsave(&d->lock, flags); | |
136 | ||
137 | if ((d->flags & DEVFL_UP) == 0) { | |
138 | printk(KERN_INFO "aoe: aoeblk_make_request: device %ld.%ld is not up\n", | |
139 | d->aoemajor, d->aoeminor); | |
140 | spin_unlock_irqrestore(&d->lock, flags); | |
141 | mempool_free(buf, d->bufpool); | |
142 | bio_endio(bio, bio->bi_size, -ENXIO); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | list_add_tail(&buf->bufs, &d->bufq); | |
147 | aoecmd_work(d); | |
148 | ||
149 | sl = d->skblist; | |
150 | d->skblist = NULL; | |
151 | ||
152 | spin_unlock_irqrestore(&d->lock, flags); | |
153 | ||
154 | aoenet_xmit(sl); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | /* This ioctl implementation expects userland to have the device node | |
159 | * permissions set so that only priviledged users can open an aoe | |
160 | * block device directly. | |
161 | */ | |
162 | static int | |
163 | aoeblk_ioctl(struct inode *inode, struct file *filp, uint cmd, ulong arg) | |
164 | { | |
165 | struct aoedev *d; | |
166 | ||
167 | if (!arg) | |
168 | return -EINVAL; | |
169 | ||
170 | d = inode->i_bdev->bd_disk->private_data; | |
171 | if ((d->flags & DEVFL_UP) == 0) { | |
172 | printk(KERN_ERR "aoe: aoeblk_ioctl: disk not up\n"); | |
173 | return -ENODEV; | |
174 | } | |
175 | ||
176 | if (cmd == HDIO_GETGEO) { | |
177 | d->geo.start = get_start_sect(inode->i_bdev); | |
178 | if (!copy_to_user((void __user *) arg, &d->geo, sizeof d->geo)) | |
179 | return 0; | |
180 | return -EFAULT; | |
181 | } | |
182 | printk(KERN_INFO "aoe: aoeblk_ioctl: unknown ioctl %d\n", cmd); | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | static struct block_device_operations aoe_bdops = { | |
187 | .open = aoeblk_open, | |
188 | .release = aoeblk_release, | |
189 | .ioctl = aoeblk_ioctl, | |
190 | .owner = THIS_MODULE, | |
191 | }; | |
192 | ||
193 | /* alloc_disk and add_disk can sleep */ | |
194 | void | |
195 | aoeblk_gdalloc(void *vp) | |
196 | { | |
197 | struct aoedev *d = vp; | |
198 | struct gendisk *gd; | |
199 | ulong flags; | |
200 | ||
201 | gd = alloc_disk(AOE_PARTITIONS); | |
202 | if (gd == NULL) { | |
203 | printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate disk " | |
204 | "structure for %ld.%ld\n", d->aoemajor, d->aoeminor); | |
205 | spin_lock_irqsave(&d->lock, flags); | |
206 | d->flags &= ~DEVFL_WORKON; | |
207 | spin_unlock_irqrestore(&d->lock, flags); | |
208 | return; | |
209 | } | |
210 | ||
211 | d->bufpool = mempool_create(MIN_BUFS, | |
212 | mempool_alloc_slab, mempool_free_slab, | |
213 | buf_pool_cache); | |
214 | if (d->bufpool == NULL) { | |
215 | printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool " | |
216 | "for %ld.%ld\n", d->aoemajor, d->aoeminor); | |
217 | put_disk(gd); | |
218 | spin_lock_irqsave(&d->lock, flags); | |
219 | d->flags &= ~DEVFL_WORKON; | |
220 | spin_unlock_irqrestore(&d->lock, flags); | |
221 | return; | |
222 | } | |
223 | ||
224 | spin_lock_irqsave(&d->lock, flags); | |
225 | blk_queue_make_request(&d->blkq, aoeblk_make_request); | |
226 | gd->major = AOE_MAJOR; | |
227 | gd->first_minor = d->sysminor * AOE_PARTITIONS; | |
228 | gd->fops = &aoe_bdops; | |
229 | gd->private_data = d; | |
230 | gd->capacity = d->ssize; | |
231 | snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld", | |
232 | d->aoemajor, d->aoeminor); | |
233 | ||
234 | gd->queue = &d->blkq; | |
235 | d->gd = gd; | |
236 | d->flags &= ~DEVFL_WORKON; | |
237 | d->flags |= DEVFL_UP; | |
238 | ||
239 | spin_unlock_irqrestore(&d->lock, flags); | |
240 | ||
241 | add_disk(gd); | |
242 | aoedisk_add_sysfs(d); | |
243 | ||
244 | printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu " | |
245 | "sectors\n", (unsigned long long)mac_addr(d->addr), | |
246 | d->aoemajor, d->aoeminor, | |
247 | d->fw_ver, (long long)d->ssize); | |
248 | } | |
249 | ||
250 | void | |
251 | aoeblk_exit(void) | |
252 | { | |
253 | kmem_cache_destroy(buf_pool_cache); | |
254 | } | |
255 | ||
256 | int __init | |
257 | aoeblk_init(void) | |
258 | { | |
259 | buf_pool_cache = kmem_cache_create("aoe_bufs", | |
260 | sizeof(struct buf), | |
261 | 0, 0, NULL, NULL); | |
262 | if (buf_pool_cache == NULL) | |
263 | return -ENOMEM; | |
264 | ||
265 | return 0; | |
266 | } | |
267 |