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