kernel-ark/drivers/block/aoe/aoeblk.c
Christoph Hellwig a885c8c431 [PATCH] Add block_device_operations.getgeo block device method
HDIO_GETGEO is implemented in most block drivers, and all of them have to
duplicate the code to copy the structure to userspace, as well as getting
the start sector.  This patch moves that to common code [1] and adds a
->getgeo method to fill out the raw kernel hd_geometry structure.  For many
drivers this means ->ioctl can go away now.

[1] the s390 block drivers are odd in this respect.  xpram sets ->start
    to 4 always which seems more than odd, and the dasd driver shifts
    the start offset around, probably because of it's non-standard
    sector size.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@suse.de>
Cc: <mike.miller@hp.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Cc: Neil Brown <neilb@cse.unsw.edu.au>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-08 20:13:54 -08:00

270 lines
6.3 KiB
C

/* 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"
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);
}
/* firmware version */
static ssize_t aoedisk_show_fwver(struct gendisk * disk, char *page)
{
struct aoedev *d = disk->private_data;
return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
}
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 struct disk_attribute disk_attr_fwver = {
.attr = {.name = "firmware-version", .mode = S_IRUGO },
.show = aoedisk_show_fwver
};
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);
sysfs_create_file(&d->gd->kobj, &disk_attr_fwver.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");
sysfs_remove_link(&d->gd->kobj, "firmware-version");
}
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->sendq_hd;
d->sendq_hd = d->sendq_tl = NULL;
spin_unlock_irqrestore(&d->lock, flags);
aoenet_xmit(sl);
return 0;
}
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: aoeblk_ioctl: disk not up\n");
return -ENODEV;
}
geo->cylinders = d->geo.cylinders;
geo->heads = d->geo.heads;
geo->sectors = d->geo.sectors;
return 0;
}
static struct block_device_operations aoe_bdops = {
.open = aoeblk_open,
.release = aoeblk_release,
.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;
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;
}