1 /* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */
4 * block device routines
7 #include <linux/hdreg.h>
8 #include <linux/blkdev.h>
9 #include <linux/backing-dev.h>
11 #include <linux/ioctl.h>
12 #include <linux/slab.h>
13 #include <linux/genhd.h>
14 #include <linux/netdevice.h>
17 static struct kmem_cache
*buf_pool_cache
;
19 static ssize_t
aoedisk_show_state(struct device
*dev
,
20 struct device_attribute
*attr
, char *page
)
22 struct gendisk
*disk
= dev_to_disk(dev
);
23 struct aoedev
*d
= disk
->private_data
;
25 return snprintf(page
, PAGE_SIZE
,
27 (d
->flags
& DEVFL_UP
) ? "up" : "down",
28 (d
->flags
& DEVFL_KICKME
) ? ",kickme" :
29 (d
->nopen
&& !(d
->flags
& DEVFL_UP
)) ? ",closewait" : "");
30 /* I'd rather see nopen exported so we can ditch closewait */
32 static ssize_t
aoedisk_show_mac(struct device
*dev
,
33 struct device_attribute
*attr
, char *page
)
35 struct gendisk
*disk
= dev_to_disk(dev
);
36 struct aoedev
*d
= disk
->private_data
;
37 struct aoetgt
*t
= d
->targets
[0];
40 return snprintf(page
, PAGE_SIZE
, "none\n");
41 return snprintf(page
, PAGE_SIZE
, "%pm\n", t
->addr
);
43 static ssize_t
aoedisk_show_netif(struct device
*dev
,
44 struct device_attribute
*attr
, char *page
)
46 struct gendisk
*disk
= dev_to_disk(dev
);
47 struct aoedev
*d
= disk
->private_data
;
48 struct net_device
*nds
[8], **nd
, **nnd
, **ne
;
49 struct aoetgt
**t
, **te
;
50 struct aoeif
*ifp
, *e
;
53 memset(nds
, 0, sizeof nds
);
55 ne
= nd
+ ARRAY_SIZE(nds
);
58 for (; t
< te
&& *t
; t
++) {
61 for (; ifp
< e
&& ifp
->nd
; ifp
++) {
62 for (nnd
= nds
; nnd
< nd
; nnd
++)
65 if (nnd
== nd
&& nd
!= ne
)
73 return snprintf(page
, PAGE_SIZE
, "none\n");
74 for (p
= page
; nd
< ne
; nd
++)
75 p
+= snprintf(p
, PAGE_SIZE
- (p
-page
), "%s%s",
76 p
== page
? "" : ",", (*nd
)->name
);
77 p
+= snprintf(p
, PAGE_SIZE
- (p
-page
), "\n");
80 /* firmware version */
81 static ssize_t
aoedisk_show_fwver(struct device
*dev
,
82 struct device_attribute
*attr
, char *page
)
84 struct gendisk
*disk
= dev_to_disk(dev
);
85 struct aoedev
*d
= disk
->private_data
;
87 return snprintf(page
, PAGE_SIZE
, "0x%04x\n", (unsigned int) d
->fw_ver
);
90 static DEVICE_ATTR(state
, S_IRUGO
, aoedisk_show_state
, NULL
);
91 static DEVICE_ATTR(mac
, S_IRUGO
, aoedisk_show_mac
, NULL
);
92 static DEVICE_ATTR(netif
, S_IRUGO
, aoedisk_show_netif
, NULL
);
93 static struct device_attribute dev_attr_firmware_version
= {
94 .attr
= { .name
= "firmware-version", .mode
= S_IRUGO
},
95 .show
= aoedisk_show_fwver
,
98 static struct attribute
*aoe_attrs
[] = {
101 &dev_attr_netif
.attr
,
102 &dev_attr_firmware_version
.attr
,
106 static const struct attribute_group attr_group
= {
111 aoedisk_add_sysfs(struct aoedev
*d
)
113 return sysfs_create_group(&disk_to_dev(d
->gd
)->kobj
, &attr_group
);
116 aoedisk_rm_sysfs(struct aoedev
*d
)
118 sysfs_remove_group(&disk_to_dev(d
->gd
)->kobj
, &attr_group
);
122 aoeblk_open(struct block_device
*bdev
, fmode_t mode
)
124 struct aoedev
*d
= bdev
->bd_disk
->private_data
;
127 spin_lock_irqsave(&d
->lock
, flags
);
128 if (d
->flags
& DEVFL_UP
) {
130 spin_unlock_irqrestore(&d
->lock
, flags
);
133 spin_unlock_irqrestore(&d
->lock
, flags
);
138 aoeblk_release(struct gendisk
*disk
, fmode_t mode
)
140 struct aoedev
*d
= disk
->private_data
;
143 spin_lock_irqsave(&d
->lock
, flags
);
145 if (--d
->nopen
== 0) {
146 spin_unlock_irqrestore(&d
->lock
, flags
);
147 aoecmd_cfg(d
->aoemajor
, d
->aoeminor
);
150 spin_unlock_irqrestore(&d
->lock
, flags
);
156 aoeblk_make_request(struct request_queue
*q
, struct bio
*bio
)
158 struct sk_buff_head queue
;
163 blk_queue_bounce(q
, &bio
);
166 printk(KERN_ERR
"aoe: bio is NULL\n");
170 d
= bio
->bi_bdev
->bd_disk
->private_data
;
172 printk(KERN_ERR
"aoe: bd_disk->private_data is NULL\n");
174 bio_endio(bio
, -ENXIO
);
176 } else if (bio_rw_flagged(bio
, BIO_RW_BARRIER
)) {
177 bio_endio(bio
, -EOPNOTSUPP
);
179 } else if (bio
->bi_io_vec
== NULL
) {
180 printk(KERN_ERR
"aoe: bi_io_vec is NULL\n");
182 bio_endio(bio
, -ENXIO
);
185 buf
= mempool_alloc(d
->bufpool
, GFP_NOIO
);
187 printk(KERN_INFO
"aoe: buf allocation failure\n");
188 bio_endio(bio
, -ENOMEM
);
191 memset(buf
, 0, sizeof(*buf
));
192 INIT_LIST_HEAD(&buf
->bufs
);
193 buf
->stime
= jiffies
;
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
;
202 spin_lock_irqsave(&d
->lock
, flags
);
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
);
213 list_add_tail(&buf
->bufs
, &d
->bufq
);
216 __skb_queue_head_init(&queue
);
217 skb_queue_splice_init(&d
->sendq
, &queue
);
219 spin_unlock_irqrestore(&d
->lock
, flags
);
226 aoeblk_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
228 struct aoedev
*d
= bdev
->bd_disk
->private_data
;
230 if ((d
->flags
& DEVFL_UP
) == 0) {
231 printk(KERN_ERR
"aoe: disk not up\n");
235 geo
->cylinders
= d
->geo
.cylinders
;
236 geo
->heads
= d
->geo
.heads
;
237 geo
->sectors
= d
->geo
.sectors
;
241 static const struct block_device_operations aoe_bdops
= {
243 .release
= aoeblk_release
,
244 .getgeo
= aoeblk_getgeo
,
245 .owner
= THIS_MODULE
,
248 /* alloc_disk and add_disk can sleep */
250 aoeblk_gdalloc(void *vp
)
252 struct aoedev
*d
= vp
;
256 gd
= alloc_disk(AOE_PARTITIONS
);
259 "aoe: cannot allocate disk structure for %ld.%d\n",
260 d
->aoemajor
, d
->aoeminor
);
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
);
271 d
->blkq
= blk_alloc_queue(GFP_KERNEL
);
274 blk_queue_make_request(d
->blkq
, aoeblk_make_request
);
275 d
->blkq
->backing_dev_info
.name
= "aoe";
276 if (bdi_init(&d
->blkq
->backing_dev_info
))
278 spin_lock_irqsave(&d
->lock
, flags
);
279 gd
->major
= AOE_MAJOR
;
280 gd
->first_minor
= d
->sysminor
* AOE_PARTITIONS
;
281 gd
->fops
= &aoe_bdops
;
282 gd
->private_data
= d
;
283 set_capacity(gd
, d
->ssize
);
284 snprintf(gd
->disk_name
, sizeof gd
->disk_name
, "etherd/e%ld.%d",
285 d
->aoemajor
, d
->aoeminor
);
289 d
->flags
&= ~DEVFL_GDALLOC
;
290 d
->flags
|= DEVFL_UP
;
292 spin_unlock_irqrestore(&d
->lock
, flags
);
295 aoedisk_add_sysfs(d
);
299 blk_cleanup_queue(d
->blkq
);
302 mempool_destroy(d
->bufpool
);
306 spin_lock_irqsave(&d
->lock
, flags
);
307 d
->flags
&= ~DEVFL_GDALLOC
;
308 spin_unlock_irqrestore(&d
->lock
, flags
);
314 kmem_cache_destroy(buf_pool_cache
);
320 buf_pool_cache
= kmem_cache_create("aoe_bufs",
323 if (buf_pool_cache
== NULL
)