1 files changed, 365 insertions, 0 deletions

diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
new file mode 100644
index 00000000000..6b2a441d276
--- /dev/null
+++ b/fs/jffs2/super.c
@@ -0,0 +1,365 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2001-2003 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ * $Id: super.c,v 1.104 2004/11/23 15:37:31 gleixner Exp $
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/jffs2.h>
+#include <linux/pagemap.h>
+#include <linux/mtd/mtd.h>
+#include <linux/ctype.h>
+#include <linux/namei.h>
+#include "compr.h"
+#include "nodelist.h"
+
+static void jffs2_put_super(struct super_block *);
+
+static kmem_cache_t *jffs2_inode_cachep;
+
+static struct inode *jffs2_alloc_inode(struct super_block *sb)
+{
+	struct jffs2_inode_info *ei;
+	ei = (struct jffs2_inode_info *)kmem_cache_alloc(jffs2_inode_cachep, SLAB_KERNEL);
+	if (!ei)
+		return NULL;
+	return &ei->vfs_inode;
+}
+
+static void jffs2_destroy_inode(struct inode *inode)
+{
+	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
+}
+
+static void jffs2_i_init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+	struct jffs2_inode_info *ei = (struct jffs2_inode_info *) foo;
+
+	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+	    SLAB_CTOR_CONSTRUCTOR) {
+		init_MUTEX_LOCKED(&ei->sem);
+		inode_init_once(&ei->vfs_inode);
+	}
+}
+
+static int jffs2_sync_fs(struct super_block *sb, int wait)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+
+	down(&c->alloc_sem);
+	jffs2_flush_wbuf_pad(c);
+	up(&c->alloc_sem);	
+	return 0;
+}
+
+static struct super_operations jffs2_super_operations =
+{
+	.alloc_inode =	jffs2_alloc_inode,
+	.destroy_inode =jffs2_destroy_inode,
+	.read_inode =	jffs2_read_inode,
+	.put_super =	jffs2_put_super,
+	.write_super =	jffs2_write_super,
+	.statfs =	jffs2_statfs,
+	.remount_fs =	jffs2_remount_fs,
+	.clear_inode =	jffs2_clear_inode,
+	.dirty_inode =	jffs2_dirty_inode,
+	.sync_fs =	jffs2_sync_fs,
+};
+
+static int jffs2_sb_compare(struct super_block *sb, void *data)
+{
+	struct jffs2_sb_info *p = data;
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+
+	/* The superblocks are considered to be equivalent if the underlying MTD
+	   device is the same one */
+	if (c->mtd == p->mtd) {
+		D1(printk(KERN_DEBUG "jffs2_sb_compare: match on device %d (\"%s\")\n", p->mtd->index, p->mtd->name));
+		return 1;
+	} else {
+		D1(printk(KERN_DEBUG "jffs2_sb_compare: No match, device %d (\"%s\"), device %d (\"%s\")\n",
+			  c->mtd->index, c->mtd->name, p->mtd->index, p->mtd->name));
+		return 0;
+	}
+}
+
+static int jffs2_sb_set(struct super_block *sb, void *data)
+{
+	struct jffs2_sb_info *p = data;
+
+	/* For persistence of NFS exports etc. we use the same s_dev
+	   each time we mount the device, don't just use an anonymous
+	   device */
+	sb->s_fs_info = p;
+	p->os_priv = sb;
+	sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, p->mtd->index);
+
+	return 0;
+}
+
+static struct super_block *jffs2_get_sb_mtd(struct file_system_type *fs_type,
+					      int flags, const char *dev_name, 
+					      void *data, struct mtd_info *mtd)
+{
+	struct super_block *sb;
+	struct jffs2_sb_info *c;
+	int ret;
+
+	c = kmalloc(sizeof(*c), GFP_KERNEL);
+	if (!c)
+		return ERR_PTR(-ENOMEM);
+	memset(c, 0, sizeof(*c));
+	c->mtd = mtd;
+
+	sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, c);
+
+	if (IS_ERR(sb))
+		goto out_put;
+
+	if (sb->s_root) {
+		/* New mountpoint for JFFS2 which is already mounted */
+		D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): Device %d (\"%s\") is already mounted\n",
+			  mtd->index, mtd->name));
+		goto out_put;
+	}
+
+	D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): New superblock for device %d (\"%s\")\n",
+		  mtd->index, mtd->name));
+
+	sb->s_op = &jffs2_super_operations;
+	sb->s_flags = flags | MS_NOATIME;
+
+	ret = jffs2_do_fill_super(sb, data, (flags&MS_VERBOSE)?1:0);
+
+	if (ret) {
+		/* Failure case... */
+		up_write(&sb->s_umount);
+		deactivate_super(sb);
+		return ERR_PTR(ret);
+	}
+
+	sb->s_flags |= MS_ACTIVE;
+	return sb;
+
+ out_put:
+	kfree(c);
+	put_mtd_device(mtd);
+
+	return sb;
+}
+
+static struct super_block *jffs2_get_sb_mtdnr(struct file_system_type *fs_type,
+					      int flags, const char *dev_name, 
+					      void *data, int mtdnr)
+{
+	struct mtd_info *mtd;
+
+	mtd = get_mtd_device(NULL, mtdnr);
+	if (!mtd) {
+		D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr));
+		return ERR_PTR(-EINVAL);
+	}
+
+	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
+}
+
+static struct super_block *jffs2_get_sb(struct file_system_type *fs_type,
+					int flags, const char *dev_name,
+					void *data)
+{
+	int err;
+	struct nameidata nd;
+	int mtdnr;
+
+	if (!dev_name)
+		return ERR_PTR(-EINVAL);
+
+	D1(printk(KERN_DEBUG "jffs2_get_sb(): dev_name \"%s\"\n", dev_name));
+
+	/* The preferred way of mounting in future; especially when
+	   CONFIG_BLK_DEV is implemented - we specify the underlying
+	   MTD device by number or by name, so that we don't require 
+	   block device support to be present in the kernel. */
+
+	/* FIXME: How to do the root fs this way? */
+
+	if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
+		/* Probably mounting without the blkdev crap */
+		if (dev_name[3] == ':') {
+			struct mtd_info *mtd;
+
+			/* Mount by MTD device name */
+			D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd:%%s, name \"%s\"\n", dev_name+4));
+			for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) {
+				mtd = get_mtd_device(NULL, mtdnr);
+				if (mtd) {
+					if (!strcmp(mtd->name, dev_name+4))
+						return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
+					put_mtd_device(mtd);
+				}
+			}
+			printk(KERN_NOTICE "jffs2_get_sb(): MTD device with name \"%s\" not found.\n", dev_name+4);
+		} else if (isdigit(dev_name[3])) {
+			/* Mount by MTD device number name */
+			char *endptr;
+			
+			mtdnr = simple_strtoul(dev_name+3, &endptr, 0);
+			if (!*endptr) {
+				/* It was a valid number */
+				D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd%%d, mtdnr %d\n", mtdnr));
+				return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr);
+			}
+		}
+	}
+
+	/* Try the old way - the hack where we allowed users to mount 
+	   /dev/mtdblock$(n) but didn't actually _use_ the blkdev */
+
+	err = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
+
+	D1(printk(KERN_DEBUG "jffs2_get_sb(): path_lookup() returned %d, inode %p\n",
+		  err, nd.dentry->d_inode));
+
+	if (err)
+		return ERR_PTR(err);
+
+	err = -EINVAL;
+
+	if (!S_ISBLK(nd.dentry->d_inode->i_mode))
+		goto out;
+
+	if (nd.mnt->mnt_flags & MNT_NODEV) {
+		err = -EACCES;
+		goto out;
+	}
+
+	if (imajor(nd.dentry->d_inode) != MTD_BLOCK_MAJOR) {
+		if (!(flags & MS_VERBOSE)) /* Yes I mean this. Strangely */
+			printk(KERN_NOTICE "Attempt to mount non-MTD device \"%s\" as JFFS2\n",
+			       dev_name);
+		goto out;
+	}
+
+	mtdnr = iminor(nd.dentry->d_inode);
+	path_release(&nd);
+
+	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr);
+
+out:
+	path_release(&nd);
+	return ERR_PTR(err);
+}
+
+static void jffs2_put_super (struct super_block *sb)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+
+	D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
+
+	if (!(sb->s_flags & MS_RDONLY))
+		jffs2_stop_garbage_collect_thread(c);
+	down(&c->alloc_sem);
+	jffs2_flush_wbuf_pad(c);
+	up(&c->alloc_sem);
+	jffs2_free_ino_caches(c);
+	jffs2_free_raw_node_refs(c);
+	if (c->mtd->flags & MTD_NO_VIRTBLOCKS)
+		vfree(c->blocks);
+	else
+		kfree(c->blocks);
+	jffs2_flash_cleanup(c);
+	kfree(c->inocache_list);
+	if (c->mtd->sync)
+		c->mtd->sync(c->mtd);
+
+	D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
+}
+
+static void jffs2_kill_sb(struct super_block *sb)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+	generic_shutdown_super(sb);
+	put_mtd_device(c->mtd);
+	kfree(c);
+}
+
+static struct file_system_type jffs2_fs_type = {
+	.owner =	THIS_MODULE,
+	.name =		"jffs2",
+	.get_sb =	jffs2_get_sb,
+	.kill_sb =	jffs2_kill_sb,
+};
+
+static int __init init_jffs2_fs(void)
+{
+	int ret;
+
+	printk(KERN_INFO "JFFS2 version 2.2."
+#ifdef CONFIG_JFFS2_FS_NAND
+	       " (NAND)"
+#endif
+	       " (C) 2001-2003 Red Hat, Inc.\n");
+
+	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
+					     sizeof(struct jffs2_inode_info),
+					     0, SLAB_RECLAIM_ACCOUNT,
+					     jffs2_i_init_once, NULL);
+	if (!jffs2_inode_cachep) {
+		printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
+		return -ENOMEM;
+	}
+	ret = jffs2_compressors_init();
+	if (ret) {
+		printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
+		goto out;
+	}
+	ret = jffs2_create_slab_caches();
+	if (ret) {
+		printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
+		goto out_compressors;
+	}
+	ret = register_filesystem(&jffs2_fs_type);
+	if (ret) {
+		printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
+		goto out_slab;
+	}
+	return 0;
+
+ out_slab:
+	jffs2_destroy_slab_caches();
+ out_compressors:
+	jffs2_compressors_exit();
+ out:
+	kmem_cache_destroy(jffs2_inode_cachep);
+	return ret;
+}
+
+static void __exit exit_jffs2_fs(void)
+{
+	unregister_filesystem(&jffs2_fs_type);
+	jffs2_destroy_slab_caches();
+	jffs2_compressors_exit();
+	kmem_cache_destroy(jffs2_inode_cachep);
+}
+
+module_init(init_jffs2_fs);
+module_exit(exit_jffs2_fs);
+
+MODULE_DESCRIPTION("The Journalling Flash File System, v2");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for 
+		       // the sake of this tag. It's Free Software.