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/*

 * JFFS -- Journalling Flash File System, Linux implementation.

 *

 * Copyright (C) 1999, 2000  Finn Hakansson, Axis Communications, Inc.

 *

 * This is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * $Id: inode.c,v 1.1 2005-12-20 10:26:13 jcastillo Exp $

 *

 */

/* inode.c -- Contains the code that is called from the VFS.  */

#include <linux/module.h>

#include <linux/types.h>

#include <linux/errno.h>

#include <linux/malloc.h>

#include <linux/jffs.h>

#include <linux/fs.h>

#include <linux/locks.h>

#include <linux/sched.h>

#include <linux/ioctl.h>

#include <linux/stat.h>

#include <linux/blkdev.h>

#include <asm/byteorder.h>

#include "jffs_fm.h"

#include "intrep.h"

#if defined(CONFIG_JFFS_FS_VERBOSE) && CONFIG_JFFS_FS_VERBOSE

#define D(x) x

#else

#define D(x)

#endif

#define D1(x)

#define D2(x)

#define D3(x)

#define ASSERT(x) x

static int jffs_remove(struct inode *dir, const char *name,

                       int len, int type, int must_iput);

static struct super_operations jffs_ops;

static struct file_operations jffs_file_operations;

static struct inode_operations jffs_file_inode_operations;

static struct file_operations jffs_dir_operations;

static struct inode_operations jffs_dir_inode_operations;

static struct inode_operations jffs_symlink_inode_operations;

/* Called by the VFS at mount time to initialize the whole file system.  */

static struct super_block *

jffs_read_super(struct super_block *sb, void *data, int silent)

{

        kdev_t dev = sb->s_dev;

        printk(KERN_NOTICE "JFFS: Trying to mount device %s.\n",

               kdevname(dev));

        MOD_INC_USE_COUNT;

        lock_super(sb);

        set_blocksize(dev, BLOCK_SIZE);

        sb->s_blocksize = BLOCK_SIZE;

        sb->s_blocksize_bits = BLOCK_SIZE_BITS;

        sb->u.generic_sbp = (void *) 0;

        /* Build the file system.  */

        if (jffs_build_fs(sb) < 0) {

                goto jffs_sb_err1;

        }

        sb->s_magic = JFFS_MAGIC_SB_BITMASK;

        sb->s_op = &jffs_ops;

        /* Get the root directory of this file system.  */

        if (!(sb->s_mounted = iget(sb, JFFS_MIN_INO))) {

                goto jffs_sb_err2;

        }

#ifdef USE_GC

        /* Do a garbage collect every time we mount.  */

        jffs_garbage_collect((struct jffs_control *)sb->u.generic_sbp);

#endif

        unlock_super(sb);

        printk(KERN_NOTICE "JFFS: Successfully mounted device %s.\n",

               kdevname(dev));

        return sb;

jffs_sb_err2:

        jffs_cleanup_control((struct jffs_control *)sb->u.generic_sbp);

jffs_sb_err1:

        unlock_super(sb);

        MOD_DEC_USE_COUNT;

        printk(KERN_WARNING "JFFS: Failed to mount device %s.\n",

               kdevname(dev));

        return 0;

}

/* This function is called when the file system is umounted.  */

static void

jffs_put_super(struct super_block *sb)

{

        kdev_t dev = sb->s_dev;

        D2(printk("jffs_put_super()\n"));

        lock_super(sb);

        sb->s_dev = 0;

        jffs_cleanup_control((struct jffs_control *)sb->u.generic_sbp);

        unlock_super(sb);

        MOD_DEC_USE_COUNT;

        printk(KERN_NOTICE "JFFS: Successfully unmounted device %s.\n",

               kdevname(dev));

}

/* This function is called when user commands like chmod, chgrp and

   chown are executed. System calls like trunc() results in a call

   to this function.  */

static int

jffs_notify_change(struct inode *inode, struct iattr *iattr)

{

        struct jffs_raw_inode raw_inode;

        struct jffs_control *c;

        struct jffs_fmcontrol *fmc;

        struct jffs_file *f;

        struct jffs_node *new_node;

        char *name = 0;

        int update_all;

        int res;

        f = (struct jffs_file *)inode->u.generic_ip;

        ASSERT(if (!f) {

                printk("jffs_notify_change(): Invalid inode number: %lu\n",

                       inode->i_ino);

                return -1;

        });

        D1(printk("***jffs_notify_change(): file: \"%s\", ino: %u\n",

                  f->name, f->ino));

        c = f->c;

        fmc = c->fmc;

        update_all = iattr->ia_valid & ATTR_FORCE;

        if (!JFFS_ENOUGH_SPACE(fmc)) {

                if (((update_all || iattr->ia_valid & ATTR_SIZE)

                    && (iattr->ia_size < f->size))) {

                        /* See this case where someone is trying to

                           shrink the size of a file as an exception.

                           Accept it.  */

                }

                else {

                        D1(printk("jffs_notify_change(): Free size = %u\n",

                                  jffs_free_size1(fmc)

                                  + jffs_free_size2(fmc)));

                        D(printk(KERN_NOTICE "JFFS: No space left on "

                                 "device\n"));

                        return -ENOSPC;

                }

        }

        if (!(new_node = (struct jffs_node *)

                         kmalloc(sizeof(struct jffs_node), GFP_KERNEL))) {

                D(printk("jffs_notify_change(): Allocation failed!\n"));

                return -ENOMEM;

        }

        DJM(no_jffs_node++);

        new_node->data_offset = 0;

        new_node->removed_size = 0;

        raw_inode.magic = JFFS_MAGIC_BITMASK;

        raw_inode.ino = f->ino;

        raw_inode.pino = f->pino;

        raw_inode.version = f->highest_version + 1;

        raw_inode.mode = f->mode;

        raw_inode.uid = f->uid;

        raw_inode.gid = f->gid;

        raw_inode.atime = f->atime;

        raw_inode.mtime = f->mtime;

        raw_inode.ctime = f->ctime;

        raw_inode.dsize = 0;

        raw_inode.offset = 0;

        raw_inode.rsize = 0;

        raw_inode.dsize = 0;

        raw_inode.nsize = 0;

        raw_inode.nlink = f->nlink;

        raw_inode.spare = 0;

        raw_inode.rename = 0;

        raw_inode.deleted = 0;

        if (update_all || iattr->ia_valid & ATTR_MODE) {

                raw_inode.mode = iattr->ia_mode;

                inode->i_mode = iattr->ia_mode;

        }

        if (update_all || iattr->ia_valid & ATTR_UID) {

                raw_inode.uid = iattr->ia_uid;

                inode->i_uid = iattr->ia_uid;

        }

        if (update_all || iattr->ia_valid & ATTR_GID) {

                raw_inode.gid = iattr->ia_gid;

                inode->i_gid = iattr->ia_gid;

        }

        if (update_all || iattr->ia_valid & ATTR_SIZE) {

                int len;

                D1(printk("jffs_notify_change(): Changing size "

                          "to %lu bytes!\n", iattr->ia_size));

                raw_inode.offset = iattr->ia_size;

                /* Calculate how many bytes need to be removed from

                   the end.  */

                if (f->size < iattr->ia_size) {

                        len = 0;

                }

                else {

                        len = f->size - iattr->ia_size;

                }

                raw_inode.rsize = len;

                /* The updated node will be a removal node, with

                   base at the new size and size of the nbr of bytes

                   to be removed.  */

                new_node->data_offset = iattr->ia_size;

                new_node->removed_size = len;

                inode->i_size = iattr->ia_size;

                /* If we truncate a file we want to add the name.  If we

                   always do that, we could perhaps free more space on

                   the flash (and besides it doesn't hurt).  */

                name = f->name;

                raw_inode.nsize = f->nsize;

                if (len) {

                        invalidate_inode_pages(inode);

                }

                inode->i_ctime = CURRENT_TIME;

                inode->i_mtime = inode->i_ctime;

        }

        if (update_all || iattr->ia_valid & ATTR_ATIME) {

                raw_inode.atime = iattr->ia_atime;

                inode->i_atime = iattr->ia_atime;

        }

        if (update_all || iattr->ia_valid & ATTR_MTIME) {

                raw_inode.mtime = iattr->ia_mtime;

                inode->i_mtime = iattr->ia_mtime;

        }

        if (update_all || iattr->ia_valid & ATTR_CTIME) {

                raw_inode.ctime = iattr->ia_ctime;

                inode->i_ctime = iattr->ia_ctime;

        }

        /* Write this node to the flash.  */

        if ((res = jffs_write_node(c, new_node, &raw_inode, name, 0)) < 0) {

                D(printk("jffs_notify_change(): The write failed!\n"));

                kfree(new_node);

                DJM(no_jffs_node--);

                return res;

        }

        jffs_insert_node(c, f, &raw_inode, 0, new_node);

        inode->i_dirt = 1;

        return 0;

} /* jffs_notify_change()  */

/* Get statistics of the file system.  */

static void

jffs_statfs(struct super_block *sb, struct statfs *buf, int bufsize)

{

        struct statfs tmp;

        struct jffs_control *c = (struct jffs_control *) sb->u.generic_sbp;

        struct jffs_fmcontrol *fmc = c->fmc;

        D2(printk("jffs_statfs()\n"));

        c = (struct jffs_control *)sb->u.generic_sbp;

        memset(&tmp, 0, sizeof(tmp));

        tmp.f_type = JFFS_MAGIC_SB_BITMASK;

        tmp.f_bsize = PAGE_SIZE;

        tmp.f_blocks = (fmc->flash_size / BLOCK_SIZE)

                       - (fmc->min_free_size / BLOCK_SIZE);

        tmp.f_bfree = (jffs_free_size1(fmc) / BLOCK_SIZE

                       + jffs_free_size2(fmc) / BLOCK_SIZE)

                      - (fmc->min_free_size / BLOCK_SIZE);

        /* Find out how many files there are in the filesystem.  */

        tmp.f_files = jffs_foreach_file(c, jffs_file_count);

        tmp.f_ffree = tmp.f_bfree;

        /* tmp.f_fsid = 0; */

        tmp.f_namelen = JFFS_MAX_NAME_LEN;

        memcpy_tofs(buf, &tmp, bufsize);

}

/* Rename a file.  */

int

jffs_rename(struct inode *old_dir, const char *old_name, int old_len,

            struct inode *new_dir, const char *new_name, int new_len,

            int must_be_dir)

{

        struct jffs_raw_inode raw_inode;

        struct jffs_control *c;

        struct jffs_file *old_dir_f;

        struct jffs_file *new_dir_f;

        struct jffs_file *del_f;

        struct jffs_file *f;

        struct jffs_node *node;

        struct inode *inode;

        int result = 0;

        __u32 rename_data = 0;

        D2(printk("***jffs_rename()\n"));

        if (!old_dir || !old_name || !new_dir || !new_name) {

                D(printk("jffs_rename(): old_dir: 0x%p, old_name: 0x%p, "

                         "new_dir: 0x%p, new_name: 0x%p\n",

                         old_dir, old_name, new_dir, new_name));

                return -1;

        }

        c = (struct jffs_control *)old_dir->i_sb->u.generic_sbp;

        ASSERT(if (!c) {

                printk(KERN_ERR "jffs_rename(): The old_dir inode "

                       "didn't have a reference to a jffs_file struct\n");

                return -1;

        });

        if (!JFFS_ENOUGH_SPACE(c->fmc)) {

                D1(printk("jffs_rename(): Free size = %u\n",

                          jffs_free_size1(c->fmc) + jffs_free_size2(c->fmc)));

                D(printk(KERN_NOTICE "JFFS: No space left on device\n"));

                return -ENOSPC;

        }

        while (c->rename_lock) {

                sleep_on(&c->rename_wait);

        }

        c->rename_lock = 1;

        /* Check the lengths of the names.  */

        if ((old_len > JFFS_MAX_NAME_LEN) || (new_len > JFFS_MAX_NAME_LEN)) {

                result = -ENAMETOOLONG;

                goto jffs_rename_end;

        }

        /* Find the the old directory.  */

        if (!(old_dir_f = (struct jffs_file *)old_dir->u.generic_ip)) {

                D(printk("jffs_rename(): Old dir invalid.\n"));

                result = -ENOTDIR;

                goto jffs_rename_end;

        }

        /* See if it really is a directory.  */

        if (!S_ISDIR(old_dir_f->mode)) {

                D(printk("jffs_rename(): old_dir is not a directory.\n"));

                result = -ENOTDIR;

                goto jffs_rename_end;

        }

        /* Try to find the file to move.  */

        if (!(f = jffs_find_child(old_dir_f, old_name, old_len))) {

                result = -ENOENT;

                goto jffs_rename_end;

        }

        /* Try to find the new directory's node.  */

        if (!(new_dir_f = (struct jffs_file *)new_dir->u.generic_ip)) {

                D(printk("jffs_rename(): New dir invalid.\n"));

                result = -ENOTDIR;

                goto jffs_rename_end;

        }

        /* See if the node really is a directory.  */

        if (!S_ISDIR(new_dir_f->mode)) {

                D(printk("jffs_rename(): The new position of the node "

                         "is not a directory.\n"));

                result = -ENOTDIR;

                goto jffs_rename_end;

        }

        /* Create a node and initialize as much as needed.  */

        if (!(node = (struct jffs_node *) kmalloc(sizeof(struct jffs_node),

                                                  GFP_KERNEL))) {

                D(printk("jffs_rename(): Allocation failed: node == 0\n"));

                result = -ENOMEM;

                goto jffs_rename_end;

        }

        DJM(no_jffs_node++);

        node->data_offset = 0;

        node->removed_size = 0;

        /* Initialize the raw inode.  */

        raw_inode.magic = JFFS_MAGIC_BITMASK;

        raw_inode.ino = f->ino;

        raw_inode.pino = new_dir_f->ino;

        raw_inode.version = f->highest_version + 1;

        raw_inode.mode = f->mode;

        raw_inode.uid = current->fsuid;

        raw_inode.gid = current->fsgid;

#if 0

        raw_inode.uid = f->uid;

        raw_inode.gid = f->gid;

#endif

        raw_inode.atime = CURRENT_TIME;

        raw_inode.mtime = raw_inode.atime;

        raw_inode.ctime = f->ctime;

        raw_inode.offset = 0;

        raw_inode.dsize = 0;

        raw_inode.rsize = 0;

        raw_inode.nsize = new_len;

        raw_inode.nlink = f->nlink;

        raw_inode.spare = 0;

        raw_inode.rename = 0;

        raw_inode.deleted = 0;

        /* See if there already exists a file with the same name as

           new_name.  */

        if ((del_f = jffs_find_child(new_dir_f, new_name, new_len))) {

                raw_inode.rename = 1;

                /*raw_inode.mode = del_f->ino;*/

        }

        /* Write the new node to the flash memory.  */

        if ((result = jffs_write_node(c, node, &raw_inode, new_name,

                                      (unsigned char*)&rename_data)) < 0) {

                D(printk("jffs_rename(): Failed to write node to flash.\n"));

                kfree(node);

                DJM(no_jffs_node--);

                goto jffs_rename_end;

        }

        if (raw_inode.rename) {

                /* The file with the same name must be deleted.  */

                c->fmc->no_call_gc = 1;

                if ((result = jffs_remove(new_dir, new_name, new_len,

                                          del_f->mode, 0)) < 0) {

                        /* This is really bad.  */

                        printk(KERN_ERR "JFFS: An error occurred in "

                               "rename().\n");

                }

                c->fmc->no_call_gc = 0;

        }

        if (old_dir_f != new_dir_f) {

                /* Remove the file from its old position in the

                   filesystem tree.  */

                jffs_unlink_file_from_tree(f);

        }

        /* Insert the new node into the file system.  */

        if ((result = jffs_insert_node(c, f, &raw_inode,

                                       new_name, node)) < 0) {

                D(printk(KERN_ERR "jffs_rename(): jffs_insert_node() "

                         "failed!\n"));

        }

        if (old_dir_f != new_dir_f) {

                /* Insert the file to its new position in the

                   file system.  */

                jffs_insert_file_into_tree(f);

        }

        /* This is a kind of update of the inode we're about to make

           here.  This is what they do in ext2fs.  Kind of.  */

        if ((inode = iget(new_dir->i_sb, f->ino))) {

                inode->i_ctime = CURRENT_TIME;

                inode->i_dirt = 1;

                iput(inode);

        }

jffs_rename_end:

        iput(old_dir);

        iput(new_dir);

        c->rename_lock = 0;

        wake_up(&c->rename_wait);

        return result;

} /* jffs_rename()  */

/* Read the contents of a directory.  Used by programs like `ls'

   for instance.  */

static int

jffs_readdir(struct inode *dir, struct file *filp, void *dirent, filldir_t filldir)

{

        struct jffs_file *f;

        int j;

        int ddino;

        D2(printk("jffs_readdir(): dir: 0x%p, filp: 0x%p\n", dir, filp));

        if (!dir || !S_ISDIR(dir->i_mode)) {

                D(printk("jffs_readdir(): 'dir' is NULL or not a dir!\n"));

                return -EBADF;

        }

        switch (filp->f_pos)

        {

        case 0:

                D3(printk("jffs_readdir(): \".\" %lu\n", dir->i_ino));

                if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino) < 0) {

                        return 0;

                }

                filp->f_pos = 1;

        case 1:

                if (dir->i_ino == JFFS_MIN_INO) {

                        ddino = dir->i_sb->s_covered->i_ino;

                }

                else {

                        ddino = ((struct jffs_file *)dir->u.generic_ip)->pino;

                }

                D3(printk("jffs_readdir(): \"..\" %u\n", ddino));

                if (filldir(dirent, "..", 2, filp->f_pos, ddino) < 0)

                        return 0;

                filp->f_pos++;

        default:

                f = ((struct jffs_file *)dir->u.generic_ip)->children;

                for (j = 2; (j < filp->f_pos) && f; j++) {

                        f = f->sibling_next;

                }

                for (; f ; f = f->sibling_next) {

                        D3(printk("jffs_readdir(): \"%s\" ino: %u\n",

                                  (f->name ? f->name : ""), f->ino));

                        if (filldir(dirent, f->name, f->nsize,

                                    filp->f_pos , f->ino) < 0)

                                return 0;

                        filp->f_pos++;

                }

        }

        return filp->f_pos;

} /* jffs_readdir()  */

/* Find a file in a directory. If the file exists, return its

   corresponding inode in the argument `result'.  */

static int

jffs_lookup(struct inode *dir, const char *name, int len,

            struct inode **result)

{

        struct jffs_file *d;

        struct jffs_file *f;

        int r = 0;

        D3({

                char *s = (char *)kmalloc(len + 1, GFP_KERNEL);

                memcpy(s, name, len);

                s[len] = '\0';

                printk("jffs_lookup(): dir: 0x%p, name: \"%s\"\n", dir, s);

                kfree(s);

        });

        *result = (struct inode *)0;

        if (!dir) {

                return -ENOENT;

        }

        if (!S_ISDIR(dir->i_mode)) {

                r = -ENOTDIR;

                goto jffs_lookup_end;

        }

        if (len > JFFS_MAX_NAME_LEN) {

                r = -ENAMETOOLONG;

                goto jffs_lookup_end;

        }

        if (!(d = (struct jffs_file *)dir->u.generic_ip)) {

                D(printk("jffs_lookup(): No such inode! (%lu)\n", dir->i_ino));

                r = -ENOENT;

                goto jffs_lookup_end;

        }

        /* Get the corresponding inode to the file.  */

        if ((len == 1) && (name[0] == '.')) {

                if (!(*result = iget(dir->i_sb, d->ino))) {

                        D(printk("jffs_lookup(): . iget() ==> NULL\n"));

                        r = -ENOENT;

                }

        }

        else if ((len == 2) && (name[0] == '.') && (name[1] == '.')) {

                if (!(*result = iget(dir->i_sb, d->pino))) {

                        D(printk("jffs_lookup(): .. iget() ==> NULL\n"));

                        r = -ENOENT;

                }

        }

        else if ((f = jffs_find_child(d, name, len))) {

                if (!(*result = iget(dir->i_sb, f->ino))) {

                        D(printk("jffs_lookup(): iget() ==> NULL\n"));

                        r = -ENOENT;

                }

        }

        else {

                D3(printk("jffs_lookup(): Couldn't find the file. "

                          "f = 0x%p, name = \"%s\", d = 0x%p, d->ino = %u\n",

                          f, name, d, d->ino));

                r = -ENOENT;

        }

jffs_lookup_end:

        iput(dir);

        return r;

} /* jffs_lookup()  */

/* Try to read a page of data from a file.  */

static int

jffs_readpage(struct inode *inode, struct page *page)

{

        unsigned long buf;

        unsigned long read_len;

        int result = -EIO;

        struct jffs_file *f = (struct jffs_file *)inode->u.generic_ip;

        int r;

        D2(printk("***jffs_readpage(): file = \"%s\", page->offset = %lu\n",

                  (f->name ? f->name : ""), page->offset));

        page->count++;

        set_bit(PG_locked, &page->flags);

        buf = page_address(page);

        clear_bit(PG_uptodate, &page->flags);

        clear_bit(PG_error, &page->flags);

        if (page->offset < inode->i_size) {

                read_len = jffs_min(inode->i_size - page->offset, PAGE_SIZE);

                r = jffs_read_data(f, (char *)buf, page->offset, read_len);

                if (r == read_len) {

                        if (read_len < PAGE_SIZE) {

                                memset((void *)(buf + read_len), 0,

                                       PAGE_SIZE - read_len);

                        }

                        set_bit(PG_uptodate, &page->flags);

                        result = 0;

                }

                D(else {

                        printk("***jffs_readpage(): Read error! "

                               "Wanted to read %lu bytes but only "

                               "read %d bytes.\n", read_len, r);

                });