1 files changed, 677 insertions, 0 deletions

diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
new file mode 100644
index 000000000000..30ab233fe423
--- /dev/null
+++ b/fs/jffs2/fs.c
@@ -0,0 +1,677 @@
+/*
+ * 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: fs.c,v 1.51 2004/11/28 12:19:37 dedekind Exp $
+ *
+ */
+
+#include <linux/version.h>
+#include <linux/config.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);
+
+static 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;
+        unsigned short dev;
+        unsigned char *mdata = NULL;
+        int mdatalen = 0;
+        unsigned int ivalid;
+        uint32_t phys_ofs, alloclen;
+        int ret;
+        D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino));
+        ret = inode_change_ok(inode, iattr);
+        if (ret) 
+                return ret;
+
+        /* 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 */
+                dev = old_encode_dev(inode->i_rdev);
+                mdata = (char *)&dev;
+                mdatalen = sizeof(dev);
+                D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen));
+        } else if (S_ISLNK(inode->i_mode)) {
+                mdatalen = f->metadata->size;
+                mdata = kmalloc(f->metadata->size, GFP_USER);
+                if (!mdata)
+                        return -ENOMEM;
+                ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen);
+                if (ret) {
+                        kfree(mdata);
+                        return ret;
+                }
+                D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", 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, &phys_ofs, &alloclen, ALLOC_NORMAL);
+        if (ret) {
+                jffs2_free_raw_inode(ri);
+                if (S_ISLNK(inode->i_mode & S_IFMT))
+                         kfree(mdata);
+                return ret;
+        }
+        down(&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)?iattr->ia_uid:inode->i_uid);
+        ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid);
+
+        if (ivalid & ATTR_MODE)
+                if (iattr->ia_mode & S_ISGID &&
+                    !in_group_p(je16_to_cpu(ri->gid)) && !capable(CAP_FSETID))
+                        ri->mode = cpu_to_jemode(iattr->ia_mode & ~S_ISGID);
+                else 
+                        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);
+        }
+        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, phys_ofs, ALLOC_NORMAL);
+        if (S_ISLNK(inode->i_mode))
+                kfree(mdata);
+        
+        if (IS_ERR(new_metadata)) {
+                jffs2_complete_reservation(c);
+                jffs2_free_raw_inode(ri);
+                up(&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);
+        inode->i_uid = je16_to_cpu(ri->uid);
+        inode->i_gid = je16_to_cpu(ri->gid);
+
+
+        old_metadata = f->metadata;
+
+        if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size)
+                jffs2_truncate_fraglist (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;
+                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);
+
+        up(&f->sem);
+        jffs2_complete_reservation(c);
+
+        /* We have to do the vmtruncate() 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)
+                vmtruncate(inode, iattr->ia_size);
+
+        return 0;
+}
+
+int jffs2_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+        return jffs2_do_setattr(dentry->d_inode, iattr);
+}
+
+int jffs2_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+        struct jffs2_sb_info *c = JFFS2_SB_INFO(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;
+
+        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;
+
+        buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;
+
+        D2(jffs2_dump_block_lists(c));
+
+        spin_unlock(&c->erase_completion_lock);
+
+        return 0;
+}
+
+
+void jffs2_clear_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);
+        
+        D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode));
+
+        jffs2_do_clear_inode(c, f);
+}
+
+void jffs2_read_inode (struct inode *inode)
+{
+        struct jffs2_inode_info *f;
+        struct jffs2_sb_info *c;
+        struct jffs2_raw_inode latest_node;
+        int ret;
+
+        D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino));
+
+        f = JFFS2_INODE_INFO(inode);
+        c = JFFS2_SB_INFO(inode->i_sb);
+
+        jffs2_init_inode_info(f);
+        
+        ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
+
+        if (ret) {
+                make_bad_inode(inode);
+                up(&f->sem);
+                return;
+        }
+        inode->i_mode = jemode_to_cpu(latest_node.mode);
+        inode->i_uid = je16_to_cpu(latest_node.uid);
+        inode->i_gid = 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));
+
+        inode->i_nlink = f->inocache->nlink;
+
+        inode->i_blksize = PAGE_SIZE;
+        inode->i_blocks = (inode->i_size + 511) >> 9;
+        
+        switch (inode->i_mode & S_IFMT) {
+                jint16_t rdev;
+
+        case S_IFLNK:
+                inode->i_op = &jffs2_symlink_inode_operations;
+                break;
+                
+        case S_IFDIR:
+        {
+                struct jffs2_full_dirent *fd;
+
+                for (fd=f->dents; fd; fd = fd->next) {
+                        if (fd->type == DT_DIR && fd->ino)
+                                inode->i_nlink++;
+                }
+                /* and '..' */
+                inode->i_nlink++;
+                /* Root dir gets i_nlink 3 for some reason */
+                if (inode->i_ino == 1)
+                        inode->i_nlink++;
+
+                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 */
+                D1(printk(KERN_DEBUG "Reading device numbers from flash\n"));
+                if (jffs2_read_dnode(c, f, f->metadata, (char *)&rdev, 0, sizeof(rdev)) < 0) {
+                        /* Eep */
+                        printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino);
+                        up(&f->sem);
+                        jffs2_do_clear_inode(c, f);
+                        make_bad_inode(inode);
+                        return;
+                }                       
+
+        case S_IFSOCK:
+        case S_IFIFO:
+                inode->i_op = &jffs2_file_inode_operations;
+                init_special_inode(inode, inode->i_mode,
+                                   old_decode_dev((je16_to_cpu(rdev))));
+                break;
+
+        default:
+                printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino);
+        }
+
+        up(&f->sem);
+
+        D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n"));
+}
+
+void jffs2_dirty_inode(struct inode *inode)
+{
+        struct iattr iattr;
+
+        if (!(inode->i_state & I_DIRTY_DATASYNC)) {
+                D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino));
+                return;
+        }
+
+        D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", 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_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);
+                down(&c->alloc_sem);
+                jffs2_flush_wbuf_pad(c);
+                up(&c->alloc_sem);
+        }       
+
+        if (!(*flags & MS_RDONLY))
+                jffs2_start_garbage_collect_thread(c);
+        
+        *flags |= MS_NOATIME;
+
+        return 0;
+}
+
+void jffs2_write_super (struct super_block *sb)
+{
+        struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+        sb->s_dirt = 0;
+
+        if (sb->s_flags & MS_RDONLY)
+                return;
+
+        D1(printk(KERN_DEBUG "jffs2_write_super()\n"));
+        jffs2_garbage_collect_trigger(c);
+        jffs2_erase_pending_blocks(c, 0);
+        jffs2_flush_wbuf_gc(c, 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, int 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;
+
+        D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", 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);
+
+        memset(ri, 0, sizeof(*ri));
+        /* Set OS-specific defaults for new inodes */
+        ri->uid = cpu_to_je16(current->fsuid);
+
+        if (dir_i->i_mode & S_ISGID) {
+                ri->gid = cpu_to_je16(dir_i->i_gid);
+                if (S_ISDIR(mode))
+                        mode |= S_ISGID;
+        } else {
+                ri->gid = cpu_to_je16(current->fsgid);
+        }
+        ri->mode =  cpu_to_jemode(mode);
+        ret = jffs2_do_new_inode (c, f, mode, ri);
+        if (ret) {
+                make_bad_inode(inode);
+                iput(inode);
+                return ERR_PTR(ret);
+        }
+        inode->i_nlink = 1;
+        inode->i_ino = je32_to_cpu(ri->ino);
+        inode->i_mode = jemode_to_cpu(ri->mode);
+        inode->i_gid = je16_to_cpu(ri->gid);
+        inode->i_uid = 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_blksize = PAGE_SIZE;
+        inode->i_blocks = 0;
+        inode->i_size = 0;
+
+        insert_inode_hash(inode);
+
+        return inode;
+}
+
+
+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);
+
+#ifndef CONFIG_JFFS2_FS_NAND
+        if (c->mtd->type == MTD_NANDFLASH) {
+                printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n");
+                return -EINVAL;
+        }
+#endif
+
+        c->flash_size = c->mtd->size;
+
+        /* 
+         * Check, if we have to concatenate physical blocks to larger virtual blocks
+         * to reduce the memorysize for c->blocks. (kmalloc allows max. 128K allocation)
+         */
+        c->sector_size = c->mtd->erasesize; 
+        blocks = c->flash_size / c->sector_size;
+        if (!(c->mtd->flags & MTD_NO_VIRTBLOCKS)) {
+                while ((blocks * sizeof (struct jffs2_eraseblock)) > (128 * 1024)) {
+                        blocks >>= 1;
+                        c->sector_size <<= 1;
+                }       
+        }
+
+        /*
+         * Size alignment check
+         */
+        if ((c->sector_size * blocks) != c->flash_size) {
+                c->flash_size = c->sector_size * blocks;                
+                printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n",
+                        c->flash_size / 1024);
+        }
+
+        if (c->sector_size != c->mtd->erasesize)
+                printk(KERN_INFO "jffs2: Erase block size too small (%dKiB). Using virtual blocks size (%dKiB) instead\n", 
+                        c->mtd->erasesize / 1024, c->sector_size / 1024);
+
+        if (c->flash_size < 5*c->sector_size) {
+                printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size);
+                return -EINVAL;
+        }
+
+        c->cleanmarker_size = sizeof(struct jffs2_unknown_node);
+        /* Joern -- stick alignment for weird 8-byte-page flash here */
+
+        /* NAND (or other bizarre) flash... do setup accordingly */
+        ret = jffs2_flash_setup(c);
+        if (ret)
+                return ret;
+
+        c->inocache_list = kmalloc(INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
+        if (!c->inocache_list) {
+                ret = -ENOMEM;
+                goto out_wbuf;
+        }
+        memset(c->inocache_list, 0, INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *));
+
+        if ((ret = jffs2_do_mount_fs(c)))
+                goto out_inohash;
+
+        ret = -EINVAL;
+
+        D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n"));
+        root_i = iget(sb, 1);
+        if (is_bad_inode(root_i)) {
+                D1(printk(KERN_WARNING "get root inode failed\n"));
+                goto out_nodes;
+        }
+
+        D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n"));
+        sb->s_root = d_alloc_root(root_i);
+        if (!sb->s_root)
+                goto out_root_i;
+
+#if LINUX_VERSION_CODE >= 0x20403
+        sb->s_maxbytes = 0xFFFFFFFF;
+#endif
+        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_i:
+        iput(root_i);
+ out_nodes:
+        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);
+ out_inohash:
+        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 nlink)
+{
+        struct inode *inode;
+        struct jffs2_inode_cache *ic;
+        if (!nlink) {
+                /* 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) {
+                        D1(printk(KERN_DEBUG "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) {
+                                D1(printk(KERN_DEBUG "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 */
+                                D1(printk(KERN_DEBUG "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 = iget(OFNI_BS_2SFFJ(c), inum);
+                if (!inode)
+                        return ERR_PTR(-ENOMEM);
+        }
+        if (is_bad_inode(inode)) {
+                printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. nlink %d\n",
+                       inum, nlink);
+                /* 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;
+        }
+
+        /* add setups for other bizarre flashes here... */
+        if (jffs2_nor_ecc(c)) {
+                ret = jffs2_nor_ecc_flash_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);
+        }
+
+        /* add cleanups for other bizarre flashes here... */
+        if (jffs2_nor_ecc(c)) {
+                jffs2_nor_ecc_flash_cleanup(c);
+        }
+}