1 /* Copyright (c) 2012 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 BUG_ON(d->debugfs == NULL);
219 debugfs_remove(d->debugfs);
224 aoedisk_add_sysfs(struct aoedev *d)
226 return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
229 aoedisk_rm_sysfs(struct aoedev *d)
231 sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
235 aoeblk_open(struct block_device *bdev, fmode_t mode)
237 struct aoedev *d = bdev->bd_disk->private_data;
240 if (!virt_addr_valid(d)) {
241 pr_crit("aoe: invalid device pointer in %s\n",
246 if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL)
249 mutex_lock(&aoeblk_mutex);
250 spin_lock_irqsave(&d->lock, flags);
251 if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) {
253 spin_unlock_irqrestore(&d->lock, flags);
254 mutex_unlock(&aoeblk_mutex);
257 spin_unlock_irqrestore(&d->lock, flags);
258 mutex_unlock(&aoeblk_mutex);
263 aoeblk_release(struct gendisk *disk, fmode_t mode)
265 struct aoedev *d = disk->private_data;
268 spin_lock_irqsave(&d->lock, flags);
270 if (--d->nopen == 0) {
271 spin_unlock_irqrestore(&d->lock, flags);
272 aoecmd_cfg(d->aoemajor, d->aoeminor);
275 spin_unlock_irqrestore(&d->lock, flags);
279 aoeblk_request(struct request_queue *q)
285 if ((d->flags & DEVFL_UP) == 0) {
286 pr_info_ratelimited("aoe: device %ld.%d is not up\n",
287 d->aoemajor, d->aoeminor);
288 while ((rq = blk_peek_request(q))) {
289 blk_start_request(rq);
290 aoe_end_request(d, rq, 1);
298 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
300 struct aoedev *d = bdev->bd_disk->private_data;
302 if ((d->flags & DEVFL_UP) == 0) {
303 printk(KERN_ERR "aoe: disk not up\n");
307 geo->cylinders = d->geo.cylinders;
308 geo->heads = d->geo.heads;
309 geo->sectors = d->geo.sectors;
314 aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg)
321 d = bdev->bd_disk->private_data;
322 if ((d->flags & DEVFL_UP) == 0) {
323 pr_err("aoe: disk not up\n");
327 if (cmd == HDIO_GET_IDENTITY) {
328 if (!copy_to_user((void __user *) arg, &d->ident,
334 /* udev calls scsi_id, which uses SG_IO, resulting in noise */
336 pr_info("aoe: unknown ioctl 0x%x\n", cmd);
341 static const struct block_device_operations aoe_bdops = {
343 .release = aoeblk_release,
344 .ioctl = aoeblk_ioctl,
345 .getgeo = aoeblk_getgeo,
346 .owner = THIS_MODULE,
349 /* alloc_disk and add_disk can sleep */
351 aoeblk_gdalloc(void *vp)
353 struct aoedev *d = vp;
356 struct request_queue *q;
357 enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, };
361 spin_lock_irqsave(&d->lock, flags);
362 if (d->flags & DEVFL_GDALLOC
363 && !(d->flags & DEVFL_TKILL)
364 && !(d->flags & DEVFL_GD_NOW))
365 d->flags |= DEVFL_GD_NOW;
368 spin_unlock_irqrestore(&d->lock, flags);
372 gd = alloc_disk(AOE_PARTITIONS);
374 pr_err("aoe: cannot allocate disk structure for %ld.%d\n",
375 d->aoemajor, d->aoeminor);
379 mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab,
382 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
383 d->aoemajor, d->aoeminor);
386 q = blk_init_queue(aoeblk_request, &d->lock);
388 pr_err("aoe: cannot allocate block queue for %ld.%d\n",
389 d->aoemajor, d->aoeminor);
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_CACHE_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;