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/* Copyright (c) 2004 Coraid, Inc. See COPYING for GPL terms. */
/*
* aoeblk.c
* block device routines
*/
#include <linux/hdreg.h>
#include <linux/blkdev.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <linux/genhd.h>
#include <linux/netdevice.h>
#include "aoe.h"
/* add attributes for our block devices in sysfs
* (see drivers/block/genhd.c:disk_attr_show, etc.)
*/
struct disk_attribute {
struct attribute attr;
ssize_t (*show)(struct gendisk *, char *);
};
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", 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;
d = inode->i_bdev->bd_disk->private_data;
return (d->flags & DEVFL_UP) ? 0 : -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 (inode->i_bdev->bd_openers == 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->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 *) 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;
enum { NPARTITIONS = 16 };
gd = alloc_disk(NPARTITIONS);
spin_lock_irqsave(&d->lock, flags);
if (gd == NULL) {
printk(KERN_CRIT "aoe: aoeblk_gdalloc: cannot allocate disk "
"structure for %ld.%ld\n", d->aoemajor, d->aoeminor);
d->flags &= ~DEVFL_WORKON;
spin_unlock_irqrestore(&d->lock, flags);
return;
}
blk_queue_make_request(&d->blkq, aoeblk_make_request);
gd->major = AOE_MAJOR;
gd->first_minor = d->sysminor * NPARTITIONS;
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", mac_addr(d->addr), d->aoemajor, d->aoeminor,
d->fw_ver, d->ssize);
}
void __exit
aoeblk_exit(void)
{
unregister_blkdev(AOE_MAJOR, DEVICE_NAME);
}
int __init
aoeblk_init(void)
{
int n;
n = register_blkdev(AOE_MAJOR, DEVICE_NAME);
if (n < 0) {
printk(KERN_ERR "aoe: aoeblk_init: can't register major\n");
return n;
}
return 0;
}
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