1 /* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */
4 * block device routines
7 #include <linux/kernel.h>
8 #include <linux/hdreg.h>
9 #include <linux/blkdev.h>
10 #include <linux/backing-dev.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 <linux/moduleparam.h>
20 #include <linux/debugfs.h>
24 static DEFINE_MUTEX(aoeblk_mutex
);
25 static struct kmem_cache
*buf_pool_cache
;
26 static struct dentry
*aoe_debugfs_dir
;
28 /* GPFS needs a larger value than the default. */
29 static int aoe_maxsectors
;
30 module_param(aoe_maxsectors
, int, 0644);
31 MODULE_PARM_DESC(aoe_maxsectors
,
32 "When nonzero, set the maximum number of sectors per I/O request");
34 static ssize_t
aoedisk_show_state(struct device
*dev
,
35 struct device_attribute
*attr
, char *page
)
37 struct gendisk
*disk
= dev_to_disk(dev
);
38 struct aoedev
*d
= disk
->private_data
;
40 return snprintf(page
, PAGE_SIZE
,
42 (d
->flags
& DEVFL_UP
) ? "up" : "down",
43 (d
->flags
& DEVFL_KICKME
) ? ",kickme" :
44 (d
->nopen
&& !(d
->flags
& DEVFL_UP
)) ? ",closewait" : "");
45 /* I'd rather see nopen exported so we can ditch closewait */
47 static ssize_t
aoedisk_show_mac(struct device
*dev
,
48 struct device_attribute
*attr
, char *page
)
50 struct gendisk
*disk
= dev_to_disk(dev
);
51 struct aoedev
*d
= disk
->private_data
;
52 struct aoetgt
*t
= d
->targets
[0];
55 return snprintf(page
, PAGE_SIZE
, "none\n");
56 return snprintf(page
, PAGE_SIZE
, "%pm\n", t
->addr
);
58 static ssize_t
aoedisk_show_netif(struct device
*dev
,
59 struct device_attribute
*attr
, char *page
)
61 struct gendisk
*disk
= dev_to_disk(dev
);
62 struct aoedev
*d
= disk
->private_data
;
63 struct net_device
*nds
[8], **nd
, **nnd
, **ne
;
64 struct aoetgt
**t
, **te
;
65 struct aoeif
*ifp
, *e
;
68 memset(nds
, 0, sizeof nds
);
70 ne
= nd
+ ARRAY_SIZE(nds
);
73 for (; t
< te
&& *t
; t
++) {
76 for (; ifp
< e
&& ifp
->nd
; ifp
++) {
77 for (nnd
= nds
; nnd
< nd
; nnd
++)
80 if (nnd
== nd
&& nd
!= ne
)
88 return snprintf(page
, PAGE_SIZE
, "none\n");
89 for (p
= page
; nd
< ne
; nd
++)
90 p
+= snprintf(p
, PAGE_SIZE
- (p
-page
), "%s%s",
91 p
== page
? "" : ",", (*nd
)->name
);
92 p
+= snprintf(p
, PAGE_SIZE
- (p
-page
), "\n");
95 /* firmware version */
96 static ssize_t
aoedisk_show_fwver(struct device
*dev
,
97 struct device_attribute
*attr
, char *page
)
99 struct gendisk
*disk
= dev_to_disk(dev
);
100 struct aoedev
*d
= disk
->private_data
;
102 return snprintf(page
, PAGE_SIZE
, "0x%04x\n", (unsigned int) d
->fw_ver
);
104 static ssize_t
aoedisk_show_payload(struct device
*dev
,
105 struct device_attribute
*attr
, char *page
)
107 struct gendisk
*disk
= dev_to_disk(dev
);
108 struct aoedev
*d
= disk
->private_data
;
110 return snprintf(page
, PAGE_SIZE
, "%lu\n", d
->maxbcnt
);
113 static int aoedisk_debugfs_show(struct seq_file
*s
, void *ignored
)
116 struct aoetgt
**t
, **te
;
117 struct aoeif
*ifp
, *ife
;
122 seq_printf(s
, "rttavg: %d rttdev: %d\n",
123 d
->rttavg
>> RTTSCALE
,
124 d
->rttdev
>> RTTDSCALE
);
125 seq_printf(s
, "nskbpool: %d\n", skb_queue_len(&d
->skbpool
));
126 seq_printf(s
, "kicked: %ld\n", d
->kicked
);
127 seq_printf(s
, "maxbcnt: %ld\n", d
->maxbcnt
);
128 seq_printf(s
, "ref: %ld\n", d
->ref
);
130 spin_lock_irqsave(&d
->lock
, flags
);
132 te
= t
+ d
->ntargets
;
133 for (; t
< te
&& *t
; t
++) {
135 seq_printf(s
, "falloc: %ld\n", (*t
)->falloc
);
136 seq_printf(s
, "ffree: %p\n",
137 list_empty(&(*t
)->ffree
) ? NULL
: (*t
)->ffree
.next
);
138 seq_printf(s
, "%pm:%d:%d:%d\n", (*t
)->addr
, (*t
)->nout
,
139 (*t
)->maxout
, (*t
)->nframes
);
140 seq_printf(s
, "\tssthresh:%d\n", (*t
)->ssthresh
);
141 seq_printf(s
, "\ttaint:%d\n", (*t
)->taint
);
142 seq_printf(s
, "\tr:%d\n", (*t
)->rpkts
);
143 seq_printf(s
, "\tw:%d\n", (*t
)->wpkts
);
145 ife
= ifp
+ ARRAY_SIZE((*t
)->ifs
);
146 for (; ifp
->nd
&& ifp
< ife
; ifp
++) {
147 seq_printf(s
, "%c%s", c
, ifp
->nd
->name
);
152 spin_unlock_irqrestore(&d
->lock
, flags
);
157 static int aoe_debugfs_open(struct inode
*inode
, struct file
*file
)
159 return single_open(file
, aoedisk_debugfs_show
, inode
->i_private
);
162 static DEVICE_ATTR(state
, S_IRUGO
, aoedisk_show_state
, NULL
);
163 static DEVICE_ATTR(mac
, S_IRUGO
, aoedisk_show_mac
, NULL
);
164 static DEVICE_ATTR(netif
, S_IRUGO
, aoedisk_show_netif
, NULL
);
165 static struct device_attribute dev_attr_firmware_version
= {
166 .attr
= { .name
= "firmware-version", .mode
= S_IRUGO
},
167 .show
= aoedisk_show_fwver
,
169 static DEVICE_ATTR(payload
, S_IRUGO
, aoedisk_show_payload
, NULL
);
171 static struct attribute
*aoe_attrs
[] = {
172 &dev_attr_state
.attr
,
174 &dev_attr_netif
.attr
,
175 &dev_attr_firmware_version
.attr
,
176 &dev_attr_payload
.attr
,
180 static const struct attribute_group attr_group
= {
184 static const struct file_operations aoe_debugfs_fops
= {
185 .open
= aoe_debugfs_open
,
188 .release
= single_release
,
192 aoedisk_add_debugfs(struct aoedev
*d
)
194 struct dentry
*entry
;
197 if (aoe_debugfs_dir
== NULL
)
199 p
= strchr(d
->gd
->disk_name
, '/');
201 p
= d
->gd
->disk_name
;
205 entry
= debugfs_create_file(p
, 0444, aoe_debugfs_dir
, d
,
207 if (IS_ERR_OR_NULL(entry
)) {
208 pr_info("aoe: cannot create debugfs file for %s\n",
216 aoedisk_rm_debugfs(struct aoedev
*d
)
218 debugfs_remove(d
->debugfs
);
223 aoedisk_add_sysfs(struct aoedev
*d
)
225 return sysfs_create_group(&disk_to_dev(d
->gd
)->kobj
, &attr_group
);
228 aoedisk_rm_sysfs(struct aoedev
*d
)
230 sysfs_remove_group(&disk_to_dev(d
->gd
)->kobj
, &attr_group
);
234 aoeblk_open(struct block_device
*bdev
, fmode_t mode
)
236 struct aoedev
*d
= bdev
->bd_disk
->private_data
;
239 if (!virt_addr_valid(d
)) {
240 pr_crit("aoe: invalid device pointer in %s\n",
245 if (!(d
->flags
& DEVFL_UP
) || d
->flags
& DEVFL_TKILL
)
248 mutex_lock(&aoeblk_mutex
);
249 spin_lock_irqsave(&d
->lock
, flags
);
250 if (d
->flags
& DEVFL_UP
&& !(d
->flags
& DEVFL_TKILL
)) {
252 spin_unlock_irqrestore(&d
->lock
, flags
);
253 mutex_unlock(&aoeblk_mutex
);
256 spin_unlock_irqrestore(&d
->lock
, flags
);
257 mutex_unlock(&aoeblk_mutex
);
262 aoeblk_release(struct gendisk
*disk
, fmode_t mode
)
264 struct aoedev
*d
= disk
->private_data
;
267 spin_lock_irqsave(&d
->lock
, flags
);
269 if (--d
->nopen
== 0) {
270 spin_unlock_irqrestore(&d
->lock
, flags
);
271 aoecmd_cfg(d
->aoemajor
, d
->aoeminor
);
274 spin_unlock_irqrestore(&d
->lock
, flags
);
278 aoeblk_request(struct request_queue
*q
)
284 if ((d
->flags
& DEVFL_UP
) == 0) {
285 pr_info_ratelimited("aoe: device %ld.%d is not up\n",
286 d
->aoemajor
, d
->aoeminor
);
287 while ((rq
= blk_peek_request(q
))) {
288 blk_start_request(rq
);
289 aoe_end_request(d
, rq
, 1);
297 aoeblk_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
299 struct aoedev
*d
= bdev
->bd_disk
->private_data
;
301 if ((d
->flags
& DEVFL_UP
) == 0) {
302 printk(KERN_ERR
"aoe: disk not up\n");
306 geo
->cylinders
= d
->geo
.cylinders
;
307 geo
->heads
= d
->geo
.heads
;
308 geo
->sectors
= d
->geo
.sectors
;
313 aoeblk_ioctl(struct block_device
*bdev
, fmode_t mode
, uint cmd
, ulong arg
)
320 d
= bdev
->bd_disk
->private_data
;
321 if ((d
->flags
& DEVFL_UP
) == 0) {
322 pr_err("aoe: disk not up\n");
326 if (cmd
== HDIO_GET_IDENTITY
) {
327 if (!copy_to_user((void __user
*) arg
, &d
->ident
,
333 /* udev calls scsi_id, which uses SG_IO, resulting in noise */
335 pr_info("aoe: unknown ioctl 0x%x\n", cmd
);
340 static const struct block_device_operations aoe_bdops
= {
342 .release
= aoeblk_release
,
343 .ioctl
= aoeblk_ioctl
,
344 .getgeo
= aoeblk_getgeo
,
345 .owner
= THIS_MODULE
,
348 /* alloc_disk and add_disk can sleep */
350 aoeblk_gdalloc(void *vp
)
352 struct aoedev
*d
= vp
;
355 struct request_queue
*q
;
356 enum { KB
= 1024, MB
= KB
* KB
, READ_AHEAD
= 2 * MB
, };
360 spin_lock_irqsave(&d
->lock
, flags
);
361 if (d
->flags
& DEVFL_GDALLOC
362 && !(d
->flags
& DEVFL_TKILL
)
363 && !(d
->flags
& DEVFL_GD_NOW
))
364 d
->flags
|= DEVFL_GD_NOW
;
367 spin_unlock_irqrestore(&d
->lock
, flags
);
371 gd
= alloc_disk(AOE_PARTITIONS
);
373 pr_err("aoe: cannot allocate disk structure for %ld.%d\n",
374 d
->aoemajor
, d
->aoeminor
);
378 mp
= mempool_create(MIN_BUFS
, mempool_alloc_slab
, mempool_free_slab
,
381 printk(KERN_ERR
"aoe: cannot allocate bufpool for %ld.%d\n",
382 d
->aoemajor
, d
->aoeminor
);
385 q
= blk_init_queue(aoeblk_request
, &d
->lock
);
387 pr_err("aoe: cannot allocate block queue for %ld.%d\n",
388 d
->aoemajor
, d
->aoeminor
);
391 blk_queue_bounce_limit(q
, BLK_BOUNCE_HIGH
);
393 spin_lock_irqsave(&d
->lock
, flags
);
394 WARN_ON(!(d
->flags
& DEVFL_GD_NOW
));
395 WARN_ON(!(d
->flags
& DEVFL_GDALLOC
));
396 WARN_ON(d
->flags
& DEVFL_TKILL
);
398 WARN_ON(d
->flags
& DEVFL_UP
);
399 blk_queue_max_hw_sectors(q
, BLK_DEF_MAX_SECTORS
);
400 q
->backing_dev_info
->name
= "aoe";
401 q
->backing_dev_info
->ra_pages
= READ_AHEAD
/ PAGE_SIZE
;
403 d
->blkq
= gd
->queue
= q
;
407 blk_queue_max_hw_sectors(q
, aoe_maxsectors
);
408 gd
->major
= AOE_MAJOR
;
409 gd
->first_minor
= d
->sysminor
;
410 gd
->fops
= &aoe_bdops
;
411 gd
->private_data
= d
;
412 set_capacity(gd
, d
->ssize
);
413 snprintf(gd
->disk_name
, sizeof gd
->disk_name
, "etherd/e%ld.%d",
414 d
->aoemajor
, d
->aoeminor
);
416 d
->flags
&= ~DEVFL_GDALLOC
;
417 d
->flags
|= DEVFL_UP
;
419 spin_unlock_irqrestore(&d
->lock
, flags
);
422 aoedisk_add_sysfs(d
);
423 aoedisk_add_debugfs(d
);
425 spin_lock_irqsave(&d
->lock
, flags
);
426 WARN_ON(!(d
->flags
& DEVFL_GD_NOW
));
427 d
->flags
&= ~DEVFL_GD_NOW
;
428 spin_unlock_irqrestore(&d
->lock
, flags
);
436 spin_lock_irqsave(&d
->lock
, flags
);
437 d
->flags
&= ~DEVFL_GD_NOW
;
438 schedule_work(&d
->work
);
439 spin_unlock_irqrestore(&d
->lock
, flags
);
445 debugfs_remove_recursive(aoe_debugfs_dir
);
446 aoe_debugfs_dir
= NULL
;
447 kmem_cache_destroy(buf_pool_cache
);
453 buf_pool_cache
= kmem_cache_create("aoe_bufs",
456 if (buf_pool_cache
== NULL
)
458 aoe_debugfs_dir
= debugfs_create_dir("aoe", NULL
);
459 if (IS_ERR_OR_NULL(aoe_debugfs_dir
)) {
460 pr_info("aoe: cannot create debugfs directory\n");
461 aoe_debugfs_dir
= NULL
;