/* Copyright (c) 2004 Coraid, Inc. See COPYING for GPL terms. */ /* * aoeblk.c * block device routines */ #include #include #include #include #include #include #include "aoe.h" static kmem_cache_t *buf_pool_cache; /* add attributes for our block devices in sysfs */ static ssize_t aoedisk_show_state(struct gendisk * disk, char *page) { struct aoedev *d = disk->private_data; return snprintf(page, PAGE_SIZE, "%s%s\n", (d->flags & DEVFL_UP) ? "up" : "down", (d->flags & DEVFL_CLOSEWAIT) ? ",closewait" : ""); } static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page) { struct aoedev *d = disk->private_data; return snprintf(page, PAGE_SIZE, "%012llx\n", (unsigned long long)mac_addr(d->addr)); } static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page) { struct aoedev *d = disk->private_data; return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name); } static struct disk_attribute disk_attr_state = { .attr = {.name = "state", .mode = S_IRUGO }, .show = aoedisk_show_state }; static struct disk_attribute disk_attr_mac = { .attr = {.name = "mac", .mode = S_IRUGO }, .show = aoedisk_show_mac }; static struct disk_attribute disk_attr_netif = { .attr = {.name = "netif", .mode = S_IRUGO }, .show = aoedisk_show_netif }; static void aoedisk_add_sysfs(struct aoedev *d) { sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr); sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr); sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr); } void aoedisk_rm_sysfs(struct aoedev *d) { sysfs_remove_link(&d->gd->kobj, "state"); sysfs_remove_link(&d->gd->kobj, "mac"); sysfs_remove_link(&d->gd->kobj, "netif"); } static int aoeblk_open(struct inode *inode, struct file *filp) { struct aoedev *d; ulong flags; d = inode->i_bdev->bd_disk->private_data; spin_lock_irqsave(&d->lock, flags); if (d->flags & DEVFL_UP) { d->nopen++; spin_unlock_irqrestore(&d->lock, flags); return 0; } spin_unlock_irqrestore(&d->lock, flags); return -ENODEV; } static int aoeblk_release(struct inode *inode, struct file *filp) { struct aoedev *d; ulong flags; d = inode->i_bdev->bd_disk->private_data; spin_lock_irqsave(&d->lock, flags); if (--d->nopen == 0 && (d->flags & DEVFL_CLOSEWAIT)) { d->flags &= ~DEVFL_CLOSEWAIT; spin_unlock_irqrestore(&d->lock, flags); aoecmd_cfg(d->aoemajor, d->aoeminor); return 0; } spin_unlock_irqrestore(&d->lock, flags); return 0; } static int aoeblk_make_request(request_queue_t *q, struct bio *bio) { struct aoedev *d; struct buf *buf; struct sk_buff *sl; ulong flags; blk_queue_bounce(q, &bio); d = bio->bi_bdev->bd_disk->private_data; buf = mempool_alloc(d->bufpool, GFP_NOIO); if (buf == NULL) { printk(KERN_INFO "aoe: aoeblk_make_request: buf allocation " "failure\n"); bio_endio(bio, bio->bi_size, -ENOMEM); return 0; } memset(buf, 0, sizeof(*buf)); INIT_LIST_HEAD(&buf->bufs); buf->start_time = jiffies; buf->bio = bio; buf->resid = bio->bi_size; buf->sector = bio->bi_sector; buf->bv = buf->bio->bi_io_vec; buf->bv_resid = buf->bv->bv_len; buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset; spin_lock_irqsave(&d->lock, flags); if ((d->flags & DEVFL_UP) == 0) { printk(KERN_INFO "aoe: aoeblk_make_request: device %ld.%ld is not up\n", d->aoemajor, d->aoeminor); spin_unlock_irqrestore(&d->lock, flags); mempool_free(buf, d->bufpool); bio_endio(bio, bio->bi_size, -ENXIO); return 0; } list_add_tail(&buf->bufs, &d->bufq); aoecmd_work(d); sl = d->skblist; d->skblist = NULL; spin_unlock_irqrestore(&d->lock, flags); aoenet_xmit(sl); return 0; } /* This ioctl implementation expects userland to have the device node * permissions set so that only priviledged users can open an aoe * block device directly. */ static int aoeblk_ioctl(struct inode *inode, struct file *filp, uint cmd, ulong arg) { struct aoedev *d; if (!arg) return -EINVAL; d = inode->i_bdev->bd_disk->private_data; if ((d->flags & DEVFL_UP) == 0) { printk(KERN_ERR "aoe: aoeblk_ioctl: disk not up\n"); return -ENODEV; } if (cmd == HDIO_GETGEO) { d->geo.start = get_start_sect(inode->i_bdev); if (!copy_to_user((void __user *) arg, &d->geo, sizeof d->geo)) return 0; return -EFAULT; } printk(KERN_INFO "aoe: aoeblk_ioctl: unknown ioctl %d\n", cmd); return -EINVAL; } static struct block_device_operations aoe_bdops = { .open = aoeblk_open, .release = aoeblk_release, .ioctl = aoeblk_ioctl, .owner = THIS_MODULE, }; /* alloc_disk and add_disk can sleep */ void aoeblk_gdalloc(void *vp) { struct aoedev *d = vp; struct gendisk *gd; ulong flags; gd = alloc_disk(AOE_PARTITIONS); if (gd == NULL) { printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate disk " "structure for %ld.%ld\n", d->aoemajor, d->aoeminor); spin_lock_irqsave(&d->lock, flags); d->flags &= ~DEVFL_WORKON; spin_unlock_irqrestore(&d->lock, flags); return; } d->bufpool = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab, buf_pool_cache); if (d->bufpool == NULL) { printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool " "for %ld.%ld\n", d->aoemajor, d->aoeminor); put_disk(gd); spin_lock_irqsave(&d->lock, flags); d->flags &= ~DEVFL_WORKON; spin_unlock_irqrestore(&d->lock, flags); return; } spin_lock_irqsave(&d->lock, flags); blk_queue_make_request(&d->blkq, aoeblk_make_request); gd->major = AOE_MAJOR; gd->first_minor = d->sysminor * AOE_PARTITIONS; gd->fops = &aoe_bdops; gd->private_data = d; gd->capacity = d->ssize; snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld", d->aoemajor, d->aoeminor); gd->queue = &d->blkq; d->gd = gd; d->flags &= ~DEVFL_WORKON; d->flags |= DEVFL_UP; spin_unlock_irqrestore(&d->lock, flags); add_disk(gd); aoedisk_add_sysfs(d); printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu " "sectors\n", (unsigned long long)mac_addr(d->addr), d->aoemajor, d->aoeminor, d->fw_ver, (long long)d->ssize); } void aoeblk_exit(void) { 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, NULL); if (buf_pool_cache == NULL) return -ENOMEM; return 0; }