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 000000000000..240abaec159b
--- /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;
+}
+