diff options
Diffstat (limited to 'drivers/block/aoe/aoedev.c')
| -rw-r--r-- | drivers/block/aoe/aoedev.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c new file mode 100644 index 00000000000..240abaec159 --- /dev/null +++ b/drivers/block/aoe/aoedev.c @@ -0,0 +1,180 @@ +/* Copyright (c) 2004 Coraid, Inc. See COPYING for GPL terms. */ +/* + * aoedev.c + * AoE device utility functions; maintains device list. + */ + +#include <linux/hdreg.h> +#include <linux/blkdev.h> +#include <linux/netdevice.h> +#include "aoe.h" + +static struct aoedev *devlist; +static spinlock_t devlist_lock; + +struct aoedev * +aoedev_bymac(unsigned char *macaddr) +{ + struct aoedev *d; + ulong flags; + + spin_lock_irqsave(&devlist_lock, flags); + + for (d=devlist; d; d=d->next) + if (!memcmp(d->addr, macaddr, 6)) + break; + + spin_unlock_irqrestore(&devlist_lock, flags); + return d; +} + +/* called with devlist lock held */ +static struct aoedev * +aoedev_newdev(ulong nframes) +{ + struct aoedev *d; + struct frame *f, *e; + + d = kcalloc(1, sizeof *d, GFP_ATOMIC); + if (d == NULL) + return NULL; + f = kcalloc(nframes, sizeof *f, GFP_ATOMIC); + if (f == NULL) { + kfree(d); + return NULL; + } + + d->nframes = nframes; + d->frames = f; + e = f + nframes; + for (; f<e; f++) + f->tag = FREETAG; + + spin_lock_init(&d->lock); + init_timer(&d->timer); + d->bufpool = NULL; /* defer to aoeblk_gdalloc */ + INIT_LIST_HEAD(&d->bufq); + d->next = devlist; + devlist = d; + + return d; +} + +void +aoedev_downdev(struct aoedev *d) +{ + struct frame *f, *e; + struct buf *buf; + struct bio *bio; + + d->flags |= DEVFL_TKILL; + del_timer(&d->timer); + + f = d->frames; + e = f + d->nframes; + for (; f<e; f->tag = FREETAG, f->buf = NULL, f++) { + if (f->tag == FREETAG || f->buf == NULL) + continue; + buf = f->buf; + bio = buf->bio; + if (--buf->nframesout == 0) { + mempool_free(buf, d->bufpool); + bio_endio(bio, bio->bi_size, -EIO); + } + } + d->inprocess = NULL; + + while (!list_empty(&d->bufq)) { + buf = container_of(d->bufq.next, struct buf, bufs); + list_del(d->bufq.next); + bio = buf->bio; + mempool_free(buf, d->bufpool); + bio_endio(bio, bio->bi_size, -EIO); + } + + if (d->nopen) + d->flags |= DEVFL_CLOSEWAIT; + if (d->gd) + d->gd->capacity = 0; + + d->flags &= ~DEVFL_UP; +} + +struct aoedev * +aoedev_set(ulong sysminor, unsigned char *addr, struct net_device *ifp, ulong bufcnt) +{ + struct aoedev *d; + ulong flags; + + spin_lock_irqsave(&devlist_lock, flags); + + for (d=devlist; d; d=d->next) + if (d->sysminor == sysminor + || memcmp(d->addr, addr, sizeof d->addr) == 0) + break; + + if (d == NULL && (d = aoedev_newdev(bufcnt)) == NULL) { + spin_unlock_irqrestore(&devlist_lock, flags); + printk(KERN_INFO "aoe: aoedev_set: aoedev_newdev failure.\n"); + return NULL; + } + + spin_unlock_irqrestore(&devlist_lock, flags); + spin_lock_irqsave(&d->lock, flags); + + d->ifp = ifp; + + if (d->sysminor != sysminor + || memcmp(d->addr, addr, sizeof d->addr) + || (d->flags & DEVFL_UP) == 0) { + aoedev_downdev(d); /* flushes outstanding frames */ + memcpy(d->addr, addr, sizeof d->addr); + d->sysminor = sysminor; + d->aoemajor = AOEMAJOR(sysminor); + d->aoeminor = AOEMINOR(sysminor); + } + + spin_unlock_irqrestore(&d->lock, flags); + return d; +} + +static void +aoedev_freedev(struct aoedev *d) +{ + if (d->gd) { + aoedisk_rm_sysfs(d); + del_gendisk(d->gd); + put_disk(d->gd); + } + kfree(d->frames); + mempool_destroy(d->bufpool); + kfree(d); +} + +void +aoedev_exit(void) +{ + struct aoedev *d; + ulong flags; + + flush_scheduled_work(); + + while ((d = devlist)) { + devlist = d->next; + + spin_lock_irqsave(&d->lock, flags); + aoedev_downdev(d); + spin_unlock_irqrestore(&d->lock, flags); + + del_timer_sync(&d->timer); + aoedev_freedev(d); + } +} + +int __init +aoedev_init(void) +{ + spin_lock_init(&devlist_lock); + return 0; +} + |