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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/block/aoe/aoeblk.c | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/block/aoe/aoeblk.c')
-rw-r--r-- | drivers/block/aoe/aoeblk.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c new file mode 100644 index 0000000..63561b2 --- /dev/null +++ b/drivers/block/aoe/aoeblk.c @@ -0,0 +1,267 @@ +/* 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); +} + +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->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; +} + |