/* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */ /* * aoeblk.c * block device routines */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "aoe.h" static DEFINE_MUTEX(aoeblk_mutex); static struct kmem_cache *buf_pool_cache; static struct dentry *aoe_debugfs_dir; /* GPFS needs a larger value than the default. */ static int aoe_maxsectors; module_param(aoe_maxsectors, int, 0644); MODULE_PARM_DESC(aoe_maxsectors, "When nonzero, set the maximum number of sectors per I/O request"); static ssize_t aoedisk_show_state(struct device *dev, struct device_attribute *attr, char *page) { struct gendisk *disk = dev_to_disk(dev); struct aoedev *d = disk->private_data; return snprintf(page, PAGE_SIZE, "%s%s\n", (d->flags & DEVFL_UP) ? "up" : "down", (d->flags & DEVFL_KICKME) ? ",kickme" : (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : ""); /* I'd rather see nopen exported so we can ditch closewait */ } static ssize_t aoedisk_show_mac(struct device *dev, struct device_attribute *attr, char *page) { struct gendisk *disk = dev_to_disk(dev); struct aoedev *d = disk->private_data; struct aoetgt *t = d->targets[0]; if (t == NULL) return snprintf(page, PAGE_SIZE, "none\n"); return snprintf(page, PAGE_SIZE, "%pm\n", t->addr); } static ssize_t aoedisk_show_netif(struct device *dev, struct device_attribute *attr, char *page) { struct gendisk *disk = dev_to_disk(dev); struct aoedev *d = disk->private_data; struct net_device *nds[8], **nd, **nnd, **ne; struct aoetgt **t, **te; struct aoeif *ifp, *e; char *p; memset(nds, 0, sizeof nds); nd = nds; ne = nd + ARRAY_SIZE(nds); t = d->targets; te = t + d->ntargets; for (; t < te && *t; t++) { ifp = (*t)->ifs; e = ifp + NAOEIFS; for (; ifp < e && ifp->nd; ifp++) { for (nnd = nds; nnd < nd; nnd++) if (*nnd == ifp->nd) break; if (nnd == nd && nd != ne) *nd++ = ifp->nd; } } ne = nd; nd = nds; if (*nd == NULL) return snprintf(page, PAGE_SIZE, "none\n"); for (p = page; nd < ne; nd++) p += snprintf(p, PAGE_SIZE - (p-page), "%s%s", p == page ? "" : ",", (*nd)->name); p += snprintf(p, PAGE_SIZE - (p-page), "\n"); return p-page; } /* firmware version */ static ssize_t aoedisk_show_fwver(struct device *dev, struct device_attribute *attr, char *page) { struct gendisk *disk = dev_to_disk(dev); struct aoedev *d = disk->private_data; return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver); } static ssize_t aoedisk_show_payload(struct device *dev, struct device_attribute *attr, char *page) { struct gendisk *disk = dev_to_disk(dev); struct aoedev *d = disk->private_data; return snprintf(page, PAGE_SIZE, "%lu\n", d->maxbcnt); } static int aoedisk_debugfs_show(struct seq_file *s, void *ignored) { struct aoedev *d; struct aoetgt **t, **te; struct aoeif *ifp, *ife; unsigned long flags; char c; d = s->private; seq_printf(s, "rttavg: %d rttdev: %d\n", d->rttavg >> RTTSCALE, d->rttdev >> RTTDSCALE); seq_printf(s, "nskbpool: %d\n", skb_queue_len(&d->skbpool)); seq_printf(s, "kicked: %ld\n", d->kicked); seq_printf(s, "maxbcnt: %ld\n", d->maxbcnt); seq_printf(s, "ref: %ld\n", d->ref); spin_lock_irqsave(&d->lock, flags); t = d->targets; te = t + d->ntargets; for (; t < te && *t; t++) { c = '\t'; seq_printf(s, "falloc: %ld\n", (*t)->falloc); seq_printf(s, "ffree: %p\n", list_empty(&(*t)->ffree) ? NULL : (*t)->ffree.next); seq_printf(s, "%pm:%d:%d:%d\n", (*t)->addr, (*t)->nout, (*t)->maxout, (*t)->nframes); seq_printf(s, "\tssthresh:%d\n", (*t)->ssthresh); seq_printf(s, "\ttaint:%d\n", (*t)->taint); seq_printf(s, "\tr:%d\n", (*t)->rpkts); seq_printf(s, "\tw:%d\n", (*t)->wpkts); ifp = (*t)->ifs; ife = ifp + ARRAY_SIZE((*t)->ifs); for (; ifp->nd && ifp < ife; ifp++) { seq_printf(s, "%c%s", c, ifp->nd->name); c = ','; } seq_puts(s, "\n"); } spin_unlock_irqrestore(&d->lock, flags); return 0; } static int aoe_debugfs_open(struct inode *inode, struct file *file) { return single_open(file, aoedisk_debugfs_show, inode->i_private); } static DEVICE_ATTR(state, 0444, aoedisk_show_state, NULL); static DEVICE_ATTR(mac, 0444, aoedisk_show_mac, NULL); static DEVICE_ATTR(netif, 0444, aoedisk_show_netif, NULL); static struct device_attribute dev_attr_firmware_version = { .attr = { .name = "firmware-version", .mode = 0444 }, .show = aoedisk_show_fwver, }; static DEVICE_ATTR(payload, 0444, aoedisk_show_payload, NULL); static struct attribute *aoe_attrs[] = { &dev_attr_state.attr, &dev_attr_mac.attr, &dev_attr_netif.attr, &dev_attr_firmware_version.attr, &dev_attr_payload.attr, NULL, }; static const struct attribute_group aoe_attr_group = { .attrs = aoe_attrs, }; static const struct attribute_group *aoe_attr_groups[] = { &aoe_attr_group, NULL, }; static const struct file_operations aoe_debugfs_fops = { .open = aoe_debugfs_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static void aoedisk_add_debugfs(struct aoedev *d) { struct dentry *entry; char *p; if (aoe_debugfs_dir == NULL) return; p = strchr(d->gd->disk_name, '/'); if (p == NULL) p = d->gd->disk_name; else p++; BUG_ON(*p == '\0'); entry = debugfs_create_file(p, 0444, aoe_debugfs_dir, d, &aoe_debugfs_fops); if (IS_ERR_OR_NULL(entry)) { pr_info("aoe: cannot create debugfs file for %s\n", d->gd->disk_name); return; } BUG_ON(d->debugfs); d->debugfs = entry; } void aoedisk_rm_debugfs(struct aoedev *d) { debugfs_remove(d->debugfs); d->debugfs = NULL; } static int aoeblk_open(struct block_device *bdev, fmode_t mode) { struct aoedev *d = bdev->bd_disk->private_data; ulong flags; if (!virt_addr_valid(d)) { pr_crit("aoe: invalid device pointer in %s\n", __func__); WARN_ON(1); return -ENODEV; } if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL) return -ENODEV; mutex_lock(&aoeblk_mutex); spin_lock_irqsave(&d->lock, flags); if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) { d->nopen++; spin_unlock_irqrestore(&d->lock, flags); mutex_unlock(&aoeblk_mutex); return 0; } spin_unlock_irqrestore(&d->lock, flags); mutex_unlock(&aoeblk_mutex); return -ENODEV; } static void aoeblk_release(struct gendisk *disk, fmode_t mode) { struct aoedev *d = disk->private_data; ulong flags; spin_lock_irqsave(&d->lock, flags); if (--d->nopen == 0) { spin_unlock_irqrestore(&d->lock, flags); aoecmd_cfg(d->aoemajor, d->aoeminor); return; } spin_unlock_irqrestore(&d->lock, flags); } static void aoeblk_request(struct request_queue *q) { struct aoedev *d; struct request *rq; d = q->queuedata; if ((d->flags & DEVFL_UP) == 0) { pr_info_ratelimited("aoe: device %ld.%d is not up\n", d->aoemajor, d->aoeminor); while ((rq = blk_peek_request(q))) { blk_start_request(rq); aoe_end_request(d, rq, 1); } return; } aoecmd_work(d); } static int aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo) { struct aoedev *d = bdev->bd_disk->private_data; if ((d->flags & DEVFL_UP) == 0) { printk(KERN_ERR "aoe: disk not up\n"); return -ENODEV; } geo->cylinders = d->geo.cylinders; geo->heads = d->geo.heads; geo->sectors = d->geo.sectors; return 0; } static int aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg) { struct aoedev *d; if (!arg) return -EINVAL; d = bdev->bd_disk->private_data; if ((d->flags & DEVFL_UP) == 0) { pr_err("aoe: disk not up\n"); return -ENODEV; } if (cmd == HDIO_GET_IDENTITY) { if (!copy_to_user((void __user *) arg, &d->ident, sizeof(d->ident))) return 0; return -EFAULT; } /* udev calls scsi_id, which uses SG_IO, resulting in noise */ if (cmd != SG_IO) pr_info("aoe: unknown ioctl 0x%x\n", cmd); return -ENOTTY; } static const struct block_device_operations aoe_bdops = { .open = aoeblk_open, .release = aoeblk_release, .ioctl = aoeblk_ioctl, .getgeo = aoeblk_getgeo, .owner = THIS_MODULE, }; /* alloc_disk and add_disk can sleep */ void aoeblk_gdalloc(void *vp) { struct aoedev *d = vp; struct gendisk *gd; mempool_t *mp; struct request_queue *q; enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, }; ulong flags; int late = 0; spin_lock_irqsave(&d->lock, flags); if (d->flags & DEVFL_GDALLOC && !(d->flags & DEVFL_TKILL) && !(d->flags & DEVFL_GD_NOW)) d->flags |= DEVFL_GD_NOW; else late = 1; spin_unlock_irqrestore(&d->lock, flags); if (late) return; gd = alloc_disk(AOE_PARTITIONS); if (gd == NULL) { pr_err("aoe: cannot allocate disk structure for %ld.%d\n", d->aoemajor, d->aoeminor); goto err; } mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab, buf_pool_cache); if (mp == NULL) { printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n", d->aoemajor, d->aoeminor); goto err_disk; } q = blk_init_queue(aoeblk_request, &d->lock); if (q == NULL) { pr_err("aoe: cannot allocate block queue for %ld.%d\n", d->aoemajor, d->aoeminor); goto err_mempool; } spin_lock_irqsave(&d->lock, flags); WARN_ON(!(d->flags & DEVFL_GD_NOW)); WARN_ON(!(d->flags & DEVFL_GDALLOC)); WARN_ON(d->flags & DEVFL_TKILL); WARN_ON(d->gd); WARN_ON(d->flags & DEVFL_UP); blk_queue_max_hw_sectors(q, BLK_DEF_MAX_SECTORS); q->backing_dev_info->name = "aoe"; q->backing_dev_info->ra_pages = READ_AHEAD / PAGE_SIZE; d->bufpool = mp; d->blkq = gd->queue = q; q->queuedata = d; d->gd = gd; if (aoe_maxsectors) blk_queue_max_hw_sectors(q, aoe_maxsectors); gd->major = AOE_MAJOR; gd->first_minor = d->sysminor; gd->fops = &aoe_bdops; gd->private_data = d; set_capacity(gd, d->ssize); snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d", d->aoemajor, d->aoeminor); d->flags &= ~DEVFL_GDALLOC; d->flags |= DEVFL_UP; spin_unlock_irqrestore(&d->lock, flags); device_add_disk(NULL, gd, aoe_attr_groups); aoedisk_add_debugfs(d); spin_lock_irqsave(&d->lock, flags); WARN_ON(!(d->flags & DEVFL_GD_NOW)); d->flags &= ~DEVFL_GD_NOW; spin_unlock_irqrestore(&d->lock, flags); return; err_mempool: mempool_destroy(mp); err_disk: put_disk(gd); err: spin_lock_irqsave(&d->lock, flags); d->flags &= ~DEVFL_GD_NOW; schedule_work(&d->work); spin_unlock_irqrestore(&d->lock, flags); } void aoeblk_exit(void) { debugfs_remove_recursive(aoe_debugfs_dir); aoe_debugfs_dir = NULL; kmem_cache_destroy(buf_pool_cache); } int __init aoeblk_init(void) { buf_pool_cache = kmem_cache_create("aoe_bufs", sizeof(struct buf), 0, 0, NULL); if (buf_pool_cache == NULL) return -ENOMEM; aoe_debugfs_dir = debugfs_create_dir("aoe", NULL); if (IS_ERR_OR_NULL(aoe_debugfs_dir)) { pr_info("aoe: cannot create debugfs directory\n"); aoe_debugfs_dir = NULL; } return 0; }