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, 619 insertions, 0 deletions

diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
new file mode 100644
index 000000000000..d7c7adcc0a67
--- /dev/null
+++ b/arch/um/drivers/mconsole_kern.c
@@ -0,0 +1,619 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
+ * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "linux/slab.h"
+#include "linux/init.h"
+#include "linux/notifier.h"
+#include "linux/reboot.h"
+#include "linux/utsname.h"
+#include "linux/ctype.h"
+#include "linux/interrupt.h"
+#include "linux/sysrq.h"
+#include "linux/workqueue.h"
+#include "linux/module.h"
+#include "linux/file.h"
+#include "linux/fs.h"
+#include "linux/namei.h"
+#include "linux/proc_fs.h"
+#include "linux/syscalls.h"
+#include "asm/irq.h"
+#include "asm/uaccess.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "kern.h"
+#include "mconsole.h"
+#include "mconsole_kern.h"
+#include "irq_user.h"
+#include "init.h"
+#include "os.h"
+#include "umid.h"
+#include "irq_kern.h"
+
+static int do_unlink_socket(struct notifier_block *notifier, 
+                            unsigned long what, void *data)
+{
+        return(mconsole_unlink_socket());
+}
+
+
+static struct notifier_block reboot_notifier = {
+        .notifier_call          = do_unlink_socket,
+        .priority               = 0,
+};
+
+/* Safe without explicit locking for now.  Tasklets provide their own 
+ * locking, and the interrupt handler is safe because it can't interrupt
+ * itself and it can only happen on CPU 0.
+ */
+
+LIST_HEAD(mc_requests);
+
+static void mc_work_proc(void *unused)
+{
+        struct mconsole_entry *req;
+        unsigned long flags;
+
+        while(!list_empty(&mc_requests)){
+                local_save_flags(flags);
+                req = list_entry(mc_requests.next, struct mconsole_entry, 
+                                 list);
+                list_del(&req->list);
+                local_irq_restore(flags);
+                req->request.cmd->handler(&req->request);
+                kfree(req);
+        }
+}
+
+DECLARE_WORK(mconsole_work, mc_work_proc, NULL);
+
+static irqreturn_t mconsole_interrupt(int irq, void *dev_id,
+                                      struct pt_regs *regs)
+{
+        /* long to avoid size mismatch warnings from gcc */
+        long fd;
+        struct mconsole_entry *new;
+        struct mc_request req;
+
+        fd = (long) dev_id;
+        while (mconsole_get_request(fd, &req)){
+                if(req.cmd->context == MCONSOLE_INTR)
+                        (*req.cmd->handler)(&req);
+                else {
+                        new = kmalloc(sizeof(*new), GFP_ATOMIC);
+                        if(new == NULL)
+                                mconsole_reply(&req, "Out of memory", 1, 0);
+                        else {
+                                new->request = req;
+                                list_add(&new->list, &mc_requests);
+                        }
+                }
+        }
+        if(!list_empty(&mc_requests))
+                schedule_work(&mconsole_work);
+        reactivate_fd(fd, MCONSOLE_IRQ);
+        return(IRQ_HANDLED);
+}
+
+void mconsole_version(struct mc_request *req)
+{
+        char version[256];
+
+        sprintf(version, "%s %s %s %s %s", system_utsname.sysname, 
+                system_utsname.nodename, system_utsname.release, 
+                system_utsname.version, system_utsname.machine);
+        mconsole_reply(req, version, 0, 0);
+}
+
+void mconsole_log(struct mc_request *req)
+{
+        int len;
+        char *ptr = req->request.data;
+
+        ptr += strlen("log ");
+
+        len = req->len - (ptr - req->request.data);
+        printk("%.*s", len, ptr);
+        mconsole_reply(req, "", 0, 0);
+}
+
+/* This is a more convoluted version of mconsole_proc, which has some stability
+ * problems; however, we need it fixed, because it is expected that UML users
+ * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still
+ * show the real procfs content, not the ones from hppfs.*/
+#if 0
+void mconsole_proc(struct mc_request *req)
+{
+        struct nameidata nd;
+        struct file_system_type *proc;
+        struct super_block *super;
+        struct file *file;
+        int n, err;
+        char *ptr = req->request.data, *buf;
+
+        ptr += strlen("proc");
+        while(isspace(*ptr)) ptr++;
+
+        proc = get_fs_type("proc");
+        if(proc == NULL){
+                mconsole_reply(req, "procfs not registered", 1, 0);
+                goto out;
+        }
+
+        super = (*proc->get_sb)(proc, 0, NULL, NULL);
+        put_filesystem(proc);
+        if(super == NULL){
+                mconsole_reply(req, "Failed to get procfs superblock", 1, 0);
+                goto out;
+        }
+        up_write(&super->s_umount);
+
+        nd.dentry = super->s_root;
+        nd.mnt = NULL;
+        nd.flags = O_RDONLY + 1;
+        nd.last_type = LAST_ROOT;
+
+        /* START: it was experienced that the stability problems are closed
+         * if commenting out these two calls + the below read cycle. To
+         * make UML crash again, it was enough to readd either one.*/
+        err = link_path_walk(ptr, &nd);
+        if(err){
+                mconsole_reply(req, "Failed to look up file", 1, 0);
+                goto out_kill;
+        }
+
+        file = dentry_open(nd.dentry, nd.mnt, O_RDONLY);
+        if(IS_ERR(file)){
+                mconsole_reply(req, "Failed to open file", 1, 0);
+                goto out_kill;
+        }
+        /*END*/
+
+        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+        if(buf == NULL){
+                mconsole_reply(req, "Failed to allocate buffer", 1, 0);
+                goto out_fput;
+        }
+
+        if((file->f_op != NULL) && (file->f_op->read != NULL)){
+                do {
+                        n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1,
+                                                &file->f_pos);
+                        if(n >= 0){
+                                buf[n] = '\0';
+                                mconsole_reply(req, buf, 0, (n > 0));
+                        }
+                        else {
+                                mconsole_reply(req, "Read of file failed",
+                                               1, 0);
+                                goto out_free;
+                        }
+                } while(n > 0);
+        }
+        else mconsole_reply(req, "", 0, 0);
+
+ out_free:
+        kfree(buf);
+ out_fput:
+        fput(file);
+ out_kill:
+        deactivate_super(super);
+ out: ;
+}
+#endif
+
+void mconsole_proc(struct mc_request *req)
+{
+        char path[64];
+        char *buf;
+        int len;
+        int fd;
+        int first_chunk = 1;
+        char *ptr = req->request.data;
+
+        ptr += strlen("proc");
+        while(isspace(*ptr)) ptr++;
+        snprintf(path, sizeof(path), "/proc/%s", ptr);
+
+        fd = sys_open(path, 0, 0);
+        if (fd < 0) {
+                mconsole_reply(req, "Failed to open file", 1, 0);
+                printk("open %s: %d\n",path,fd);
+                goto out;
+        }
+
+        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+        if(buf == NULL){
+                mconsole_reply(req, "Failed to allocate buffer", 1, 0);
+                goto out_close;
+        }
+
+        for (;;) {
+                len = sys_read(fd, buf, PAGE_SIZE-1);
+                if (len < 0) {
+                        mconsole_reply(req, "Read of file failed", 1, 0);
+                        goto out_free;
+                }
+                /*Begin the file content on his own line.*/
+                if (first_chunk) {
+                        mconsole_reply(req, "\n", 0, 1);
+                        first_chunk = 0;
+                }
+                if (len == PAGE_SIZE-1) {
+                        buf[len] = '\0';
+                        mconsole_reply(req, buf, 0, 1);
+                } else {
+                        buf[len] = '\0';
+                        mconsole_reply(req, buf, 0, 0);
+                        break;
+                }
+        }
+
+ out_free:
+        kfree(buf);
+ out_close:
+        sys_close(fd);
+ out:
+        /* nothing */;
+}
+
+#define UML_MCONSOLE_HELPTEXT \
+"Commands: \n\
+    version - Get kernel version \n\
+    help - Print this message \n\
+    halt - Halt UML \n\
+    reboot - Reboot UML \n\
+    config <dev>=<config> - Add a new device to UML;  \n\
+        same syntax as command line \n\
+    config <dev> - Query the configuration of a device \n\
+    remove <dev> - Remove a device from UML \n\
+    sysrq <letter> - Performs the SysRq action controlled by the letter \n\
+    cad - invoke the Ctl-Alt-Del handler \n\
+    stop - pause the UML; it will do nothing until it receives a 'go' \n\
+    go - continue the UML after a 'stop' \n\
+    log <string> - make UML enter <string> into the kernel log\n\
+    proc <file> - returns the contents of the UML's /proc/<file>\n\
+"
+
+void mconsole_help(struct mc_request *req)
+{
+        mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0);
+}
+
+void mconsole_halt(struct mc_request *req)
+{
+        mconsole_reply(req, "", 0, 0);
+        machine_halt();
+}
+
+void mconsole_reboot(struct mc_request *req)
+{
+        mconsole_reply(req, "", 0, 0);
+        machine_restart(NULL);
+}
+
+extern void ctrl_alt_del(void);
+
+void mconsole_cad(struct mc_request *req)
+{
+        mconsole_reply(req, "", 0, 0);
+        ctrl_alt_del();
+}
+
+void mconsole_go(struct mc_request *req)
+{
+        mconsole_reply(req, "Not stopped", 1, 0);
+}
+
+void mconsole_stop(struct mc_request *req)
+{
+        deactivate_fd(req->originating_fd, MCONSOLE_IRQ);
+        os_set_fd_block(req->originating_fd, 1);
+        mconsole_reply(req, "", 0, 0);
+        while(mconsole_get_request(req->originating_fd, req)){
+                if(req->cmd->handler == mconsole_go) break;
+                (*req->cmd->handler)(req);
+        }
+        os_set_fd_block(req->originating_fd, 0);
+        reactivate_fd(req->originating_fd, MCONSOLE_IRQ);
+        mconsole_reply(req, "", 0, 0);
+}
+
+/* This list is populated by __initcall routines. */
+
+LIST_HEAD(mconsole_devices);
+
+void mconsole_register_dev(struct mc_device *new)
+{
+        list_add(&new->list, &mconsole_devices);
+}
+
+static struct mc_device *mconsole_find_dev(char *name)
+{
+        struct list_head *ele;
+        struct mc_device *dev;
+
+        list_for_each(ele, &mconsole_devices){
+                dev = list_entry(ele, struct mc_device, list);
+                if(!strncmp(name, dev->name, strlen(dev->name)))
+                        return(dev);
+        }
+        return(NULL);
+}
+
+#define CONFIG_BUF_SIZE 64
+
+static void mconsole_get_config(int (*get_config)(char *, char *, int, 
+                                                  char **),
+                                struct mc_request *req, char *name)
+{
+        char default_buf[CONFIG_BUF_SIZE], *error, *buf;
+        int n, size;
+
+        if(get_config == NULL){
+                mconsole_reply(req, "No get_config routine defined", 1, 0);
+                return;
+        }
+
+        error = NULL;
+        size = sizeof(default_buf)/sizeof(default_buf[0]);
+        buf = default_buf;
+
+        while(1){
+                n = (*get_config)(name, buf, size, &error);
+                if(error != NULL){
+                        mconsole_reply(req, error, 1, 0);
+                        goto out;
+                }
+
+                if(n <= size){
+                        mconsole_reply(req, buf, 0, 0);
+                        goto out;
+                }
+
+                if(buf != default_buf)
+                        kfree(buf);
+
+                size = n;
+                buf = kmalloc(size, GFP_KERNEL);
+                if(buf == NULL){
+                        mconsole_reply(req, "Failed to allocate buffer", 1, 0);
+                        return;
+                }
+        }
+ out:
+        if(buf != default_buf)
+                kfree(buf);
+        
+}
+
+void mconsole_config(struct mc_request *req)
+{
+        struct mc_device *dev;
+        char *ptr = req->request.data, *name;
+        int err;
+
+        ptr += strlen("config");
+        while(isspace(*ptr)) ptr++;
+        dev = mconsole_find_dev(ptr);
+        if(dev == NULL){
+                mconsole_reply(req, "Bad configuration option", 1, 0);
+                return;
+        }
+
+        name = &ptr[strlen(dev->name)];
+        ptr = name;
+        while((*ptr != '=') && (*ptr != '\0'))
+                ptr++;
+
+        if(*ptr == '='){
+                err = (*dev->config)(name);
+                mconsole_reply(req, "", err, 0);
+        }
+        else mconsole_get_config(dev->get_config, req, name);
+}
+
+void mconsole_remove(struct mc_request *req)
+{
+        struct mc_device *dev;  
+        char *ptr = req->request.data;
+        int err;
+
+        ptr += strlen("remove");
+        while(isspace(*ptr)) ptr++;
+        dev = mconsole_find_dev(ptr);
+        if(dev == NULL){
+                mconsole_reply(req, "Bad remove option", 1, 0);
+                return;
+        }
+        err = (*dev->remove)(&ptr[strlen(dev->name)]);
+        mconsole_reply(req, "", err, 0);
+}
+
+#ifdef CONFIG_MAGIC_SYSRQ
+void mconsole_sysrq(struct mc_request *req)
+{
+        char *ptr = req->request.data;
+
+        ptr += strlen("sysrq");
+        while(isspace(*ptr)) ptr++;
+
+        mconsole_reply(req, "", 0, 0);
+        handle_sysrq(*ptr, &current->thread.regs, NULL);
+}
+#else
+void mconsole_sysrq(struct mc_request *req)
+{
+        mconsole_reply(req, "Sysrq not compiled in", 1, 0);
+}
+#endif
+
+/* Changed by mconsole_setup, which is __setup, and called before SMP is
+ * active.
+ */
+static char *notify_socket = NULL; 
+
+int mconsole_init(void)
+{
+        /* long to avoid size mismatch warnings from gcc */
+        long sock;
+        int err;
+        char file[256];
+
+        if(umid_file_name("mconsole", file, sizeof(file))) return(-1);
+        snprintf(mconsole_socket_name, sizeof(file), "%s", file);
+
+        sock = os_create_unix_socket(file, sizeof(file), 1);
+        if (sock < 0){
+                printk("Failed to initialize management console\n");
+                return(1);
+        }
+
+        register_reboot_notifier(&reboot_notifier);
+
+        err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt,
+                             SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM,
+                             "mconsole", (void *)sock);
+        if (err){
+                printk("Failed to get IRQ for management console\n");
+                return(1);
+        }
+
+        if(notify_socket != NULL){
+                notify_socket = uml_strdup(notify_socket);
+                if(notify_socket != NULL)
+                        mconsole_notify(notify_socket, MCONSOLE_SOCKET,
+                                        mconsole_socket_name, 
+                                        strlen(mconsole_socket_name) + 1);
+                else printk(KERN_ERR "mconsole_setup failed to strdup "
+                            "string\n");
+        }
+
+        printk("mconsole (version %d) initialized on %s\n", 
+               MCONSOLE_VERSION, mconsole_socket_name);
+        return(0);
+}
+
+__initcall(mconsole_init);
+
+static int write_proc_mconsole(struct file *file, const char __user *buffer,
+                               unsigned long count, void *data)
+{
+        char *buf;
+
+        buf = kmalloc(count + 1, GFP_KERNEL);
+        if(buf == NULL) 
+                return(-ENOMEM);
+
+        if(copy_from_user(buf, buffer, count)){
+                count = -EFAULT;
+                goto out;
+        }
+
+        buf[count] = '\0';
+
+        mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count);
+ out:
+        kfree(buf);
+        return(count);
+}
+
+static int create_proc_mconsole(void)
+{
+        struct proc_dir_entry *ent;
+
+        if(notify_socket == NULL) return(0);
+
+        ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL);
+        if(ent == NULL){
+                printk("create_proc_mconsole : create_proc_entry failed\n");
+                return(0);
+        }
+
+        ent->read_proc = NULL;
+        ent->write_proc = write_proc_mconsole;
+        return(0);
+}
+
+static DEFINE_SPINLOCK(notify_spinlock);
+
+void lock_notify(void)
+{
+        spin_lock(&notify_spinlock);
+}
+
+void unlock_notify(void)
+{
+        spin_unlock(&notify_spinlock);
+}
+
+__initcall(create_proc_mconsole);
+
+#define NOTIFY "=notify:"
+
+static int mconsole_setup(char *str)
+{
+        if(!strncmp(str, NOTIFY, strlen(NOTIFY))){
+                str += strlen(NOTIFY);
+                notify_socket = str;
+        }
+        else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str);
+        return(1);
+}
+
+__setup("mconsole", mconsole_setup);
+
+__uml_help(mconsole_setup,
+"mconsole=notify:<socket>\n"
+"    Requests that the mconsole driver send a message to the named Unix\n"
+"    socket containing the name of the mconsole socket.  This also serves\n"
+"    to notify outside processes when UML has booted far enough to respond\n"
+"    to mconsole requests.\n\n"
+);
+
+static int notify_panic(struct notifier_block *self, unsigned long unused1,
+                        void *ptr)
+{
+        char *message = ptr;
+
+        if(notify_socket == NULL) return(0);
+
+        mconsole_notify(notify_socket, MCONSOLE_PANIC, message, 
+                        strlen(message) + 1);
+        return(0);
+}
+
+static struct notifier_block panic_exit_notifier = {
+        .notifier_call          = notify_panic,
+        .next                   = NULL,
+        .priority               = 1
+};
+
+static int add_notifier(void)
+{
+        notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
+        return(0);
+}
+
+__initcall(add_notifier);
+
+char *mconsole_notify_socket(void)
+{
+        return(notify_socket);
+}
+
+EXPORT_SYMBOL(mconsole_notify_socket);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */