Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 244 insertions, 0 deletions

diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
new file mode 100644
index 000000000000..14aeca3e2e8c
--- /dev/null
+++ b/drivers/block/aoe/aoechr.c
@@ -0,0 +1,244 @@
+/* Copyright (c) 2004 Coraid, Inc.  See COPYING for GPL terms. */
+/*
+ * aoechr.c
+ * AoE character device driver
+ */
+
+#include <linux/hdreg.h>
+#include <linux/blkdev.h>
+#include "aoe.h"
+
+enum {
+        //MINOR_STAT = 1, (moved to sysfs)
+        MINOR_ERR = 2,
+        MINOR_DISCOVER,
+        MINOR_INTERFACES,
+        MSGSZ = 2048,
+        NARGS = 10,
+        NMSG = 100,             /* message backlog to retain */
+};
+
+struct aoe_chardev {
+        ulong minor;
+        char name[32];
+};
+
+enum { EMFL_VALID = 1 };
+
+struct ErrMsg {
+        short flags;
+        short len;
+        char *msg;
+};
+
+static struct ErrMsg emsgs[NMSG];
+static int emsgs_head_idx, emsgs_tail_idx;
+static struct semaphore emsgs_sema;
+static spinlock_t emsgs_lock;
+static int nblocked_emsgs_readers;
+static struct class_simple *aoe_class;
+static struct aoe_chardev chardevs[] = {
+        { MINOR_ERR, "err" },
+        { MINOR_DISCOVER, "discover" },
+        { MINOR_INTERFACES, "interfaces" },
+};
+
+static int
+discover(void)
+{
+        aoecmd_cfg(0xffff, 0xff);
+        return 0;
+}
+
+static int
+interfaces(const char __user *str, size_t size)
+{
+        if (set_aoe_iflist(str, size)) {
+                printk(KERN_CRIT
+                       "%s: could not set interface list: %s\n",
+                       __FUNCTION__, "too many interfaces");
+                return -EINVAL;
+        }
+        return 0;
+}
+
+void
+aoechr_error(char *msg)
+{
+        struct ErrMsg *em;
+        char *mp;
+        ulong flags, n;
+
+        n = strlen(msg);
+
+        spin_lock_irqsave(&emsgs_lock, flags);
+
+        em = emsgs + emsgs_tail_idx;
+        if ((em->flags & EMFL_VALID)) {
+bail:           spin_unlock_irqrestore(&emsgs_lock, flags);
+                return;
+        }
+
+        mp = kmalloc(n, GFP_ATOMIC);
+        if (mp == NULL) {
+                printk(KERN_CRIT "aoe: aoechr_error: allocation failure, len=%ld\n", n);
+                goto bail;
+        }
+
+        memcpy(mp, msg, n);
+        em->msg = mp;
+        em->flags |= EMFL_VALID;
+        em->len = n;
+
+        emsgs_tail_idx++;
+        emsgs_tail_idx %= ARRAY_SIZE(emsgs);
+
+        spin_unlock_irqrestore(&emsgs_lock, flags);
+
+        if (nblocked_emsgs_readers)
+                up(&emsgs_sema);
+}
+
+static ssize_t
+aoechr_write(struct file *filp, const char __user *buf, size_t cnt, loff_t *offp)
+{
+        int ret = -EINVAL;
+
+        switch ((unsigned long) filp->private_data) {
+        default:
+                printk(KERN_INFO "aoe: aoechr_write: can't write to that file.\n");
+                break;
+        case MINOR_DISCOVER:
+                ret = discover();
+                break;
+        case MINOR_INTERFACES:
+                ret = interfaces(buf, cnt);
+                break;
+        }
+        if (ret == 0)
+                ret = cnt;
+        return ret;
+}
+
+static int
+aoechr_open(struct inode *inode, struct file *filp)
+{
+        int n, i;
+
+        n = MINOR(inode->i_rdev);
+        filp->private_data = (void *) (unsigned long) n;
+
+        for (i = 0; i < ARRAY_SIZE(chardevs); ++i)
+                if (chardevs[i].minor == n)
+                        return 0;
+        return -EINVAL;
+}
+
+static int
+aoechr_rel(struct inode *inode, struct file *filp)
+{
+        return 0;
+}
+
+static ssize_t
+aoechr_read(struct file *filp, char __user *buf, size_t cnt, loff_t *off)
+{
+        unsigned long n;
+        char *mp;
+        struct ErrMsg *em;
+        ssize_t len;
+        ulong flags;
+
+        n = (unsigned long) filp->private_data;
+        switch (n) {
+        case MINOR_ERR:
+                spin_lock_irqsave(&emsgs_lock, flags);
+loop:
+                em = emsgs + emsgs_head_idx;
+                if ((em->flags & EMFL_VALID) == 0) {
+                        if (filp->f_flags & O_NDELAY) {
+                                spin_unlock_irqrestore(&emsgs_lock, flags);
+                                return -EAGAIN;
+                        }
+                        nblocked_emsgs_readers++;
+
+                        spin_unlock_irqrestore(&emsgs_lock, flags);
+
+                        n = down_interruptible(&emsgs_sema);
+
+                        spin_lock_irqsave(&emsgs_lock, flags);
+
+                        nblocked_emsgs_readers--;
+
+                        if (n) {
+                                spin_unlock_irqrestore(&emsgs_lock, flags);
+                                return -ERESTARTSYS;
+                        }
+                        goto loop;
+                }
+                if (em->len > cnt) {
+                        spin_unlock_irqrestore(&emsgs_lock, flags);
+                        return -EAGAIN;
+                }
+                mp = em->msg;
+                len = em->len;
+                em->msg = NULL;
+                em->flags &= ~EMFL_VALID;
+
+                emsgs_head_idx++;
+                emsgs_head_idx %= ARRAY_SIZE(emsgs);
+
+                spin_unlock_irqrestore(&emsgs_lock, flags);
+
+                n = copy_to_user(buf, mp, len);
+                kfree(mp);
+                return n == 0 ? len : -EFAULT;
+        default:
+                return -EFAULT;
+        }
+}
+
+static struct file_operations aoe_fops = {
+        .write = aoechr_write,
+        .read = aoechr_read,
+        .open = aoechr_open,
+        .release = aoechr_rel,
+        .owner = THIS_MODULE,
+};
+
+int __init
+aoechr_init(void)
+{
+        int n, i;
+
+        n = register_chrdev(AOE_MAJOR, "aoechr", &aoe_fops);
+        if (n < 0) { 
+                printk(KERN_ERR "aoe: aoechr_init: can't register char device\n");
+                return n;
+        }
+        sema_init(&emsgs_sema, 0);
+        spin_lock_init(&emsgs_lock);
+        aoe_class = class_simple_create(THIS_MODULE, "aoe");
+        if (IS_ERR(aoe_class)) {
+                unregister_chrdev(AOE_MAJOR, "aoechr");
+                return PTR_ERR(aoe_class);
+        }
+        for (i = 0; i < ARRAY_SIZE(chardevs); ++i)
+                class_simple_device_add(aoe_class,
+                                        MKDEV(AOE_MAJOR, chardevs[i].minor),
+                                        NULL, chardevs[i].name);
+
+        return 0;
+}
+
+void
+aoechr_exit(void)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(chardevs); ++i)
+                class_simple_device_remove(MKDEV(AOE_MAJOR, chardevs[i].minor));
+        class_simple_destroy(aoe_class);
+        unregister_chrdev(AOE_MAJOR, "aoechr");
+}
+