Initial import

1 files changed, 766 insertions, 0 deletions

diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
new file mode 100644
index 000000000..fe5ea080b
--- /dev/null
+++ b/fs/jffs2/fs.c
@@ -0,0 +1,766 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright © 2001-2007 Red Hat, Inc.
+ * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/capability.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <linux/mtd/mtd.h>
+#include <linux/pagemap.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/vfs.h>
+#include <linux/crc32.h>
+#include "nodelist.h"
+
+static int jffs2_flash_setup(struct jffs2_sb_info *c);
+
+int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
+{
+	struct jffs2_full_dnode *old_metadata, *new_metadata;
+	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
+	struct jffs2_raw_inode *ri;
+	union jffs2_device_node dev;
+	unsigned char *mdata = NULL;
+	int mdatalen = 0;
+	unsigned int ivalid;
+	uint32_t alloclen;
+	int ret;
+	int alloc_type = ALLOC_NORMAL;
+
+	jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino);
+
+	/* Special cases - we don't want more than one data node
+	   for these types on the medium at any time. So setattr
+	   must read the original data associated with the node
+	   (i.e. the device numbers or the target name) and write
+	   it out again with the appropriate data attached */
+	if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
+		/* For these, we don't actually need to read the old node */
+		mdatalen = jffs2_encode_dev(&dev, inode->i_rdev);
+		mdata = (char *)&dev;
+		jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n",
+			  __func__, mdatalen);
+	} else if (S_ISLNK(inode->i_mode)) {
+		mutex_lock(&f->sem);
+		mdatalen = f->metadata->size;
+		mdata = kmalloc(f->metadata->size, GFP_USER);
+		if (!mdata) {
+			mutex_unlock(&f->sem);
+			return -ENOMEM;
+		}
+		ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen);
+		if (ret) {
+			mutex_unlock(&f->sem);
+			kfree(mdata);
+			return ret;
+		}
+		mutex_unlock(&f->sem);
+		jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n",
+			  __func__, mdatalen);
+	}
+
+	ri = jffs2_alloc_raw_inode();
+	if (!ri) {
+		if (S_ISLNK(inode->i_mode))
+			kfree(mdata);
+		return -ENOMEM;
+	}
+
+	ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen,
+				  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
+	if (ret) {
+		jffs2_free_raw_inode(ri);
+		if (S_ISLNK(inode->i_mode))
+			 kfree(mdata);
+		return ret;
+	}
+	mutex_lock(&f->sem);
+	ivalid = iattr->ia_valid;
+
+	ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
+	ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
+	ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen);
+	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
+
+	ri->ino = cpu_to_je32(inode->i_ino);
+	ri->version = cpu_to_je32(++f->highest_version);
+
+	ri->uid = cpu_to_je16((ivalid & ATTR_UID)?
+		from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode));
+	ri->gid = cpu_to_je16((ivalid & ATTR_GID)?
+		from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode));
+
+	if (ivalid & ATTR_MODE)
+		ri->mode = cpu_to_jemode(iattr->ia_mode);
+	else
+		ri->mode = cpu_to_jemode(inode->i_mode);
+
+
+	ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size);
+	ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime));
+	ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime));
+	ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime));
+
+	ri->offset = cpu_to_je32(0);
+	ri->csize = ri->dsize = cpu_to_je32(mdatalen);
+	ri->compr = JFFS2_COMPR_NONE;
+	if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
+		/* It's an extension. Make it a hole node */
+		ri->compr = JFFS2_COMPR_ZERO;
+		ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size);
+		ri->offset = cpu_to_je32(inode->i_size);
+	} else if (ivalid & ATTR_SIZE && !iattr->ia_size) {
+		/* For truncate-to-zero, treat it as deletion because
+		   it'll always be obsoleting all previous nodes */
+		alloc_type = ALLOC_DELETION;
+	}
+	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
+	if (mdatalen)
+		ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen));
+	else
+		ri->data_crc = cpu_to_je32(0);
+
+	new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type);
+	if (S_ISLNK(inode->i_mode))
+		kfree(mdata);
+
+	if (IS_ERR(new_metadata)) {
+		jffs2_complete_reservation(c);
+		jffs2_free_raw_inode(ri);
+		mutex_unlock(&f->sem);
+		return PTR_ERR(new_metadata);
+	}
+	/* It worked. Update the inode */
+	inode->i_atime = ITIME(je32_to_cpu(ri->atime));
+	inode->i_ctime = ITIME(je32_to_cpu(ri->ctime));
+	inode->i_mtime = ITIME(je32_to_cpu(ri->mtime));
+	inode->i_mode = jemode_to_cpu(ri->mode);
+	i_uid_write(inode, je16_to_cpu(ri->uid));
+	i_gid_write(inode, je16_to_cpu(ri->gid));
+
+
+	old_metadata = f->metadata;
+
+	if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size)
+		jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size);
+
+	if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
+		jffs2_add_full_dnode_to_inode(c, f, new_metadata);
+		inode->i_size = iattr->ia_size;
+		inode->i_blocks = (inode->i_size + 511) >> 9;
+		f->metadata = NULL;
+	} else {
+		f->metadata = new_metadata;
+	}
+	if (old_metadata) {
+		jffs2_mark_node_obsolete(c, old_metadata->raw);
+		jffs2_free_full_dnode(old_metadata);
+	}
+	jffs2_free_raw_inode(ri);
+
+	mutex_unlock(&f->sem);
+	jffs2_complete_reservation(c);
+
+	/* We have to do the truncate_setsize() without f->sem held, since
+	   some pages may be locked and waiting for it in readpage().
+	   We are protected from a simultaneous write() extending i_size
+	   back past iattr->ia_size, because do_truncate() holds the
+	   generic inode semaphore. */
+	if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) {
+		truncate_setsize(inode, iattr->ia_size);
+		inode->i_blocks = (inode->i_size + 511) >> 9;
+	}	
+
+	return 0;
+}
+
+int jffs2_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+	struct inode *inode = d_inode(dentry);
+	int rc;
+
+	rc = inode_change_ok(inode, iattr);
+	if (rc)
+		return rc;
+
+	rc = jffs2_do_setattr(inode, iattr);
+	if (!rc && (iattr->ia_valid & ATTR_MODE))
+		rc = posix_acl_chmod(inode, inode->i_mode);
+
+	return rc;
+}
+
+int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb);
+	unsigned long avail;
+
+	buf->f_type = JFFS2_SUPER_MAGIC;
+	buf->f_bsize = 1 << PAGE_SHIFT;
+	buf->f_blocks = c->flash_size >> PAGE_SHIFT;
+	buf->f_files = 0;
+	buf->f_ffree = 0;
+	buf->f_namelen = JFFS2_MAX_NAME_LEN;
+	buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC;
+	buf->f_fsid.val[1] = c->mtd->index;
+
+	spin_lock(&c->erase_completion_lock);
+	avail = c->dirty_size + c->free_size;
+	if (avail > c->sector_size * c->resv_blocks_write)
+		avail -= c->sector_size * c->resv_blocks_write;
+	else
+		avail = 0;
+	spin_unlock(&c->erase_completion_lock);
+
+	buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;
+
+	return 0;
+}
+
+
+void jffs2_evict_inode (struct inode *inode)
+{
+	/* We can forget about this inode for now - drop all
+	 *  the nodelists associated with it, etc.
+	 */
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
+	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+
+	jffs2_dbg(1, "%s(): ino #%lu mode %o\n",
+		  __func__, inode->i_ino, inode->i_mode);
+	truncate_inode_pages_final(&inode->i_data);
+	clear_inode(inode);
+	jffs2_do_clear_inode(c, f);
+}
+
+struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
+{
+	struct jffs2_inode_info *f;
+	struct jffs2_sb_info *c;
+	struct jffs2_raw_inode latest_node;
+	union jffs2_device_node jdev;
+	struct inode *inode;
+	dev_t rdev = 0;
+	int ret;
+
+	jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino);
+
+	inode = iget_locked(sb, ino);
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+	if (!(inode->i_state & I_NEW))
+		return inode;
+
+	f = JFFS2_INODE_INFO(inode);
+	c = JFFS2_SB_INFO(inode->i_sb);
+
+	jffs2_init_inode_info(f);
+	mutex_lock(&f->sem);
+
+	ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
+
+	if (ret) {
+		mutex_unlock(&f->sem);
+		iget_failed(inode);
+		return ERR_PTR(ret);
+	}
+	inode->i_mode = jemode_to_cpu(latest_node.mode);
+	i_uid_write(inode, je16_to_cpu(latest_node.uid));
+	i_gid_write(inode, je16_to_cpu(latest_node.gid));
+	inode->i_size = je32_to_cpu(latest_node.isize);
+	inode->i_atime = ITIME(je32_to_cpu(latest_node.atime));
+	inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime));
+	inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime));
+
+	set_nlink(inode, f->inocache->pino_nlink);
+
+	inode->i_blocks = (inode->i_size + 511) >> 9;
+
+	switch (inode->i_mode & S_IFMT) {
+
+	case S_IFLNK:
+		inode->i_op = &jffs2_symlink_inode_operations;
+		break;
+
+	case S_IFDIR:
+	{
+		struct jffs2_full_dirent *fd;
+		set_nlink(inode, 2); /* parent and '.' */
+
+		for (fd=f->dents; fd; fd = fd->next) {
+			if (fd->type == DT_DIR && fd->ino)
+				inc_nlink(inode);
+		}
+		/* Root dir gets i_nlink 3 for some reason */
+		if (inode->i_ino == 1)
+			inc_nlink(inode);
+
+		inode->i_op = &jffs2_dir_inode_operations;
+		inode->i_fop = &jffs2_dir_operations;
+		break;
+	}
+	case S_IFREG:
+		inode->i_op = &jffs2_file_inode_operations;
+		inode->i_fop = &jffs2_file_operations;
+		inode->i_mapping->a_ops = &jffs2_file_address_operations;
+		inode->i_mapping->nrpages = 0;
+		break;
+
+	case S_IFBLK:
+	case S_IFCHR:
+		/* Read the device numbers from the media */
+		if (f->metadata->size != sizeof(jdev.old_id) &&
+		    f->metadata->size != sizeof(jdev.new_id)) {
+			pr_notice("Device node has strange size %d\n",
+				  f->metadata->size);
+			goto error_io;
+		}
+		jffs2_dbg(1, "Reading device numbers from flash\n");
+		ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size);
+		if (ret < 0) {
+			/* Eep */
+			pr_notice("Read device numbers for inode %lu failed\n",
+				  (unsigned long)inode->i_ino);
+			goto error;
+		}
+		if (f->metadata->size == sizeof(jdev.old_id))
+			rdev = old_decode_dev(je16_to_cpu(jdev.old_id));
+		else
+			rdev = new_decode_dev(je32_to_cpu(jdev.new_id));
+
+	case S_IFSOCK:
+	case S_IFIFO:
+		inode->i_op = &jffs2_file_inode_operations;
+		init_special_inode(inode, inode->i_mode, rdev);
+		break;
+
+	default:
+		pr_warn("%s(): Bogus i_mode %o for ino %lu\n",
+			__func__, inode->i_mode, (unsigned long)inode->i_ino);
+	}
+
+	mutex_unlock(&f->sem);
+
+	jffs2_dbg(1, "jffs2_read_inode() returning\n");
+	unlock_new_inode(inode);
+	return inode;
+
+error_io:
+	ret = -EIO;
+error:
+	mutex_unlock(&f->sem);
+	jffs2_do_clear_inode(c, f);
+	iget_failed(inode);
+	return ERR_PTR(ret);
+}
+
+void jffs2_dirty_inode(struct inode *inode, int flags)
+{
+	struct iattr iattr;
+
+	if (!(inode->i_state & I_DIRTY_DATASYNC)) {
+		jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n",
+			  __func__, inode->i_ino);
+		return;
+	}
+
+	jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n",
+		  __func__, inode->i_ino);
+
+	iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME;
+	iattr.ia_mode = inode->i_mode;
+	iattr.ia_uid = inode->i_uid;
+	iattr.ia_gid = inode->i_gid;
+	iattr.ia_atime = inode->i_atime;
+	iattr.ia_mtime = inode->i_mtime;
+	iattr.ia_ctime = inode->i_ctime;
+
+	jffs2_do_setattr(inode, &iattr);
+}
+
+int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+
+	if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY))
+		return -EROFS;
+
+	/* We stop if it was running, then restart if it needs to.
+	   This also catches the case where it was stopped and this
+	   is just a remount to restart it.
+	   Flush the writebuffer, if neccecary, else we loose it */
+	if (!(sb->s_flags & MS_RDONLY)) {
+		jffs2_stop_garbage_collect_thread(c);
+		mutex_lock(&c->alloc_sem);
+		jffs2_flush_wbuf_pad(c);
+		mutex_unlock(&c->alloc_sem);
+	}
+
+	if (!(*flags & MS_RDONLY))
+		jffs2_start_garbage_collect_thread(c);
+
+	*flags |= MS_NOATIME;
+	return 0;
+}
+
+/* jffs2_new_inode: allocate a new inode and inocache, add it to the hash,
+   fill in the raw_inode while you're at it. */
+struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri)
+{
+	struct inode *inode;
+	struct super_block *sb = dir_i->i_sb;
+	struct jffs2_sb_info *c;
+	struct jffs2_inode_info *f;
+	int ret;
+
+	jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n",
+		  __func__, dir_i->i_ino, mode);
+
+	c = JFFS2_SB_INFO(sb);
+
+	inode = new_inode(sb);
+
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+
+	f = JFFS2_INODE_INFO(inode);
+	jffs2_init_inode_info(f);
+	mutex_lock(&f->sem);
+
+	memset(ri, 0, sizeof(*ri));
+	/* Set OS-specific defaults for new inodes */
+	ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid()));
+
+	if (dir_i->i_mode & S_ISGID) {
+		ri->gid = cpu_to_je16(i_gid_read(dir_i));
+		if (S_ISDIR(mode))
+			mode |= S_ISGID;
+	} else {
+		ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid()));
+	}
+
+	/* POSIX ACLs have to be processed now, at least partly.
+	   The umask is only applied if there's no default ACL */
+	ret = jffs2_init_acl_pre(dir_i, inode, &mode);
+	if (ret) {
+		mutex_unlock(&f->sem);
+		make_bad_inode(inode);
+		iput(inode);
+		return ERR_PTR(ret);
+	}
+	ret = jffs2_do_new_inode (c, f, mode, ri);
+	if (ret) {
+		mutex_unlock(&f->sem);
+		make_bad_inode(inode);
+		iput(inode);
+		return ERR_PTR(ret);
+	}
+	set_nlink(inode, 1);
+	inode->i_ino = je32_to_cpu(ri->ino);
+	inode->i_mode = jemode_to_cpu(ri->mode);
+	i_gid_write(inode, je16_to_cpu(ri->gid));
+	i_uid_write(inode, je16_to_cpu(ri->uid));
+	inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+	ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime));
+
+	inode->i_blocks = 0;
+	inode->i_size = 0;
+
+	if (insert_inode_locked(inode) < 0) {
+		mutex_unlock(&f->sem);
+		make_bad_inode(inode);
+		iput(inode);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return inode;
+}
+
+static int calculate_inocache_hashsize(uint32_t flash_size)
+{
+	/*
+	 * Pick a inocache hash size based on the size of the medium.
+	 * Count how many megabytes we're dealing with, apply a hashsize twice
+	 * that size, but rounding down to the usual big powers of 2. And keep
+	 * to sensible bounds.
+	 */
+
+	int size_mb = flash_size / 1024 / 1024;
+	int hashsize = (size_mb * 2) & ~0x3f;
+
+	if (hashsize < INOCACHE_HASHSIZE_MIN)
+		return INOCACHE_HASHSIZE_MIN;
+	if (hashsize > INOCACHE_HASHSIZE_MAX)
+		return INOCACHE_HASHSIZE_MAX;
+
+	return hashsize;
+}
+
+int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
+{
+	struct jffs2_sb_info *c;
+	struct inode *root_i;
+	int ret;
+	size_t blocks;
+
+	c = JFFS2_SB_INFO(sb);
+
+	/* Do not support the MLC nand */
+	if (c->mtd->type == MTD_MLCNANDFLASH)
+		return -EINVAL;
+
+#ifndef CONFIG_JFFS2_FS_WRITEBUFFER
+	if (c->mtd->type == MTD_NANDFLASH) {
+		pr_err("Cannot operate on NAND flash unless jffs2 NAND support is compiled in\n");
+		return -EINVAL;
+	}
+	if (c->mtd->type == MTD_DATAFLASH) {
+		pr_err("Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in\n");
+		return -EINVAL;
+	}
+#endif
+
+	c->flash_size = c->mtd->size;
+	c->sector_size = c->mtd->erasesize;
+	blocks = c->flash_size / c->sector_size;
+
+	/*
+	 * Size alignment check
+	 */
+	if ((c->sector_size * blocks) != c->flash_size) {
+		c->flash_size = c->sector_size * blocks;
+		pr_info("Flash size not aligned to erasesize, reducing to %dKiB\n",
+			c->flash_size / 1024);
+	}
+
+	if (c->flash_size < 5*c->sector_size) {
+		pr_err("Too few erase blocks (%d)\n",
+		       c->flash_size / c->sector_size);
+		return -EINVAL;
+	}
+
+	c->cleanmarker_size = sizeof(struct jffs2_unknown_node);
+
+	/* NAND (or other bizarre) flash... do setup accordingly */
+	ret = jffs2_flash_setup(c);
+	if (ret)
+		return ret;
+
+	c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size);
+	c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
+	if (!c->inocache_list) {
+		ret = -ENOMEM;
+		goto out_wbuf;
+	}
+
+	jffs2_init_xattr_subsystem(c);
+
+	if ((ret = jffs2_do_mount_fs(c)))
+		goto out_inohash;
+
+	jffs2_dbg(1, "%s(): Getting root inode\n", __func__);
+	root_i = jffs2_iget(sb, 1);
+	if (IS_ERR(root_i)) {
+		jffs2_dbg(1, "get root inode failed\n");
+		ret = PTR_ERR(root_i);
+		goto out_root;
+	}
+
+	ret = -ENOMEM;
+
+	jffs2_dbg(1, "%s(): d_make_root()\n", __func__);
+	sb->s_root = d_make_root(root_i);
+	if (!sb->s_root)
+		goto out_root;
+
+	sb->s_maxbytes = 0xFFFFFFFF;
+	sb->s_blocksize = PAGE_CACHE_SIZE;
+	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+	sb->s_magic = JFFS2_SUPER_MAGIC;
+	if (!(sb->s_flags & MS_RDONLY))
+		jffs2_start_garbage_collect_thread(c);
+	return 0;
+
+out_root:
+	jffs2_free_ino_caches(c);
+	jffs2_free_raw_node_refs(c);
+	if (jffs2_blocks_use_vmalloc(c))
+		vfree(c->blocks);
+	else
+		kfree(c->blocks);
+ out_inohash:
+	jffs2_clear_xattr_subsystem(c);
+	kfree(c->inocache_list);
+ out_wbuf:
+	jffs2_flash_cleanup(c);
+
+	return ret;
+}
+
+void jffs2_gc_release_inode(struct jffs2_sb_info *c,
+				   struct jffs2_inode_info *f)
+{
+	iput(OFNI_EDONI_2SFFJ(f));
+}
+
+struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
+					      int inum, int unlinked)
+{
+	struct inode *inode;
+	struct jffs2_inode_cache *ic;
+
+	if (unlinked) {
+		/* The inode has zero nlink but its nodes weren't yet marked
+		   obsolete. This has to be because we're still waiting for
+		   the final (close() and) iput() to happen.
+
+		   There's a possibility that the final iput() could have
+		   happened while we were contemplating. In order to ensure
+		   that we don't cause a new read_inode() (which would fail)
+		   for the inode in question, we use ilookup() in this case
+		   instead of iget().
+
+		   The nlink can't _become_ zero at this point because we're
+		   holding the alloc_sem, and jffs2_do_unlink() would also
+		   need that while decrementing nlink on any inode.
+		*/
+		inode = ilookup(OFNI_BS_2SFFJ(c), inum);
+		if (!inode) {
+			jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n",
+				  inum);
+
+			spin_lock(&c->inocache_lock);
+			ic = jffs2_get_ino_cache(c, inum);
+			if (!ic) {
+				jffs2_dbg(1, "Inode cache for ino #%u is gone\n",
+					  inum);
+				spin_unlock(&c->inocache_lock);
+				return NULL;
+			}
+			if (ic->state != INO_STATE_CHECKEDABSENT) {
+				/* Wait for progress. Don't just loop */
+				jffs2_dbg(1, "Waiting for ino #%u in state %d\n",
+					  ic->ino, ic->state);
+				sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock);
+			} else {
+				spin_unlock(&c->inocache_lock);
+			}
+
+			return NULL;
+		}
+	} else {
+		/* Inode has links to it still; they're not going away because
+		   jffs2_do_unlink() would need the alloc_sem and we have it.
+		   Just iget() it, and if read_inode() is necessary that's OK.
+		*/
+		inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum);
+		if (IS_ERR(inode))
+			return ERR_CAST(inode);
+	}
+	if (is_bad_inode(inode)) {
+		pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n",
+			  inum, unlinked);
+		/* NB. This will happen again. We need to do something appropriate here. */
+		iput(inode);
+		return ERR_PTR(-EIO);
+	}
+
+	return JFFS2_INODE_INFO(inode);
+}
+
+unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
+				   struct jffs2_inode_info *f,
+				   unsigned long offset,
+				   unsigned long *priv)
+{
+	struct inode *inode = OFNI_EDONI_2SFFJ(f);
+	struct page *pg;
+
+	pg = read_cache_page(inode->i_mapping, offset >> PAGE_CACHE_SHIFT,
+			     (void *)jffs2_do_readpage_unlock, inode);
+	if (IS_ERR(pg))
+		return (void *)pg;
+
+	*priv = (unsigned long)pg;
+	return kmap(pg);
+}
+
+void jffs2_gc_release_page(struct jffs2_sb_info *c,
+			   unsigned char *ptr,
+			   unsigned long *priv)
+{
+	struct page *pg = (void *)*priv;
+
+	kunmap(pg);
+	page_cache_release(pg);
+}
+
+static int jffs2_flash_setup(struct jffs2_sb_info *c) {
+	int ret = 0;
+
+	if (jffs2_cleanmarker_oob(c)) {
+		/* NAND flash... do setup accordingly */
+		ret = jffs2_nand_flash_setup(c);
+		if (ret)
+			return ret;
+	}
+
+	/* and Dataflash */
+	if (jffs2_dataflash(c)) {
+		ret = jffs2_dataflash_setup(c);
+		if (ret)
+			return ret;
+	}
+
+	/* and Intel "Sibley" flash */
+	if (jffs2_nor_wbuf_flash(c)) {
+		ret = jffs2_nor_wbuf_flash_setup(c);
+		if (ret)
+			return ret;
+	}
+
+	/* and an UBI volume */
+	if (jffs2_ubivol(c)) {
+		ret = jffs2_ubivol_setup(c);
+		if (ret)
+			return ret;
+	}
+
+	return ret;
+}
+
+void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
+
+	if (jffs2_cleanmarker_oob(c)) {
+		jffs2_nand_flash_cleanup(c);
+	}
+
+	/* and DataFlash */
+	if (jffs2_dataflash(c)) {
+		jffs2_dataflash_cleanup(c);
+	}
+
+	/* and Intel "Sibley" flash */
+	if (jffs2_nor_wbuf_flash(c)) {
+		jffs2_nor_wbuf_flash_cleanup(c);
+	}
+
+	/* and an UBI volume */
+	if (jffs2_ubivol(c)) {
+		jffs2_ubivol_cleanup(c);
+	}
+}