![Mark Fasheh](/assets/img/avatar_default.png)
Update the file systems in fs/ implementing a delete_inode() callback to call truncate_inode_pages(). One implementation note: In developing this patch I put the calls to truncate_inode_pages() at the very top of those filesystems delete_inode() callbacks in order to retain the previous behavior. I'm guessing that some of those could probably be optimized. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com> Acked-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1846 lines
48 KiB
C
1846 lines
48 KiB
C
/*
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* JFFS -- Journalling Flash File System, Linux implementation.
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*
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* Copyright (C) 1999, 2000 Axis Communications AB.
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*
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* Created by Finn Hakansson <finn@axis.com>.
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* $Id: inode-v23.c,v 1.70 2001/10/02 09:16:02 dwmw2 Exp $
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*
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* Ported to Linux 2.3.x and MTD:
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* Copyright (C) 2000 Alexander Larsson (alex@cendio.se), Cendio Systems AB
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*
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* Copyright 2000, 2001 Red Hat, Inc.
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*/
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/* inode.c -- Contains the code that is called from the VFS. */
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/* TODO-ALEX:
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* uid and gid are just 16 bit.
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* jffs_file_write reads from user-space pointers without xx_from_user
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* maybe other stuff do to.
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*/
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#include <linux/time.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/jffs.h>
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#include <linux/fs.h>
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#include <linux/smp_lock.h>
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#include <linux/ioctl.h>
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#include <linux/stat.h>
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#include <linux/blkdev.h>
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#include <linux/quotaops.h>
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#include <linux/highmem.h>
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#include <linux/vfs.h>
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#include <asm/semaphore.h>
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#include <asm/byteorder.h>
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#include <asm/uaccess.h>
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#include "jffs_fm.h"
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#include "intrep.h"
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#ifdef CONFIG_JFFS_PROC_FS
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#include "jffs_proc.h"
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#endif
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static int jffs_remove(struct inode *dir, struct dentry *dentry, int type);
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static struct super_operations jffs_ops;
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static struct file_operations jffs_file_operations;
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static struct inode_operations jffs_file_inode_operations;
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static struct file_operations jffs_dir_operations;
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static struct inode_operations jffs_dir_inode_operations;
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static struct address_space_operations jffs_address_operations;
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kmem_cache_t *node_cache = NULL;
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kmem_cache_t *fm_cache = NULL;
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/* Called by the VFS at mount time to initialize the whole file system. */
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static int jffs_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct inode *root_inode;
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struct jffs_control *c;
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sb->s_flags |= MS_NODIRATIME;
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D1(printk(KERN_NOTICE "JFFS: Trying to mount device %s.\n",
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sb->s_id));
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if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) {
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printk(KERN_WARNING "JFFS: Trying to mount a "
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"non-mtd device.\n");
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return -EINVAL;
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}
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sb->s_blocksize = PAGE_CACHE_SIZE;
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sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
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sb->s_fs_info = (void *) 0;
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sb->s_maxbytes = 0xFFFFFFFF;
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/* Build the file system. */
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if (jffs_build_fs(sb) < 0) {
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goto jffs_sb_err1;
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}
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/*
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* set up enough so that we can read an inode
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*/
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sb->s_magic = JFFS_MAGIC_SB_BITMASK;
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sb->s_op = &jffs_ops;
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root_inode = iget(sb, JFFS_MIN_INO);
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if (!root_inode)
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goto jffs_sb_err2;
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/* Get the root directory of this file system. */
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if (!(sb->s_root = d_alloc_root(root_inode))) {
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goto jffs_sb_err3;
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}
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c = (struct jffs_control *) sb->s_fs_info;
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#ifdef CONFIG_JFFS_PROC_FS
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/* Set up the jffs proc file system. */
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if (jffs_register_jffs_proc_dir(MINOR(sb->s_dev), c) < 0) {
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printk(KERN_WARNING "JFFS: Failed to initialize the JFFS "
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"proc file system for device %s.\n",
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sb->s_id);
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}
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#endif
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/* Set the Garbage Collection thresholds */
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/* GC if free space goes below 5% of the total size */
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c->gc_minfree_threshold = c->fmc->flash_size / 20;
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if (c->gc_minfree_threshold < c->fmc->sector_size)
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c->gc_minfree_threshold = c->fmc->sector_size;
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/* GC if dirty space exceeds 33% of the total size. */
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c->gc_maxdirty_threshold = c->fmc->flash_size / 3;
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if (c->gc_maxdirty_threshold < c->fmc->sector_size)
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c->gc_maxdirty_threshold = c->fmc->sector_size;
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c->thread_pid = kernel_thread (jffs_garbage_collect_thread,
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(void *) c,
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CLONE_KERNEL);
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D1(printk(KERN_NOTICE "JFFS: GC thread pid=%d.\n", (int) c->thread_pid));
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D1(printk(KERN_NOTICE "JFFS: Successfully mounted device %s.\n",
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sb->s_id));
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return 0;
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jffs_sb_err3:
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iput(root_inode);
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jffs_sb_err2:
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jffs_cleanup_control((struct jffs_control *)sb->s_fs_info);
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jffs_sb_err1:
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printk(KERN_WARNING "JFFS: Failed to mount device %s.\n",
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sb->s_id);
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return -EINVAL;
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}
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/* This function is called when the file system is umounted. */
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static void
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jffs_put_super(struct super_block *sb)
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{
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struct jffs_control *c = (struct jffs_control *) sb->s_fs_info;
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D2(printk("jffs_put_super()\n"));
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#ifdef CONFIG_JFFS_PROC_FS
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jffs_unregister_jffs_proc_dir(c);
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#endif
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if (c->gc_task) {
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D1(printk (KERN_NOTICE "jffs_put_super(): Telling gc thread to die.\n"));
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send_sig(SIGKILL, c->gc_task, 1);
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}
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wait_for_completion(&c->gc_thread_comp);
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D1(printk (KERN_NOTICE "jffs_put_super(): Successfully waited on thread.\n"));
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jffs_cleanup_control((struct jffs_control *)sb->s_fs_info);
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D1(printk(KERN_NOTICE "JFFS: Successfully unmounted device %s.\n",
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sb->s_id));
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}
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/* This function is called when user commands like chmod, chgrp and
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chown are executed. System calls like trunc() results in a call
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to this function. */
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static int
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jffs_setattr(struct dentry *dentry, struct iattr *iattr)
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{
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struct inode *inode = dentry->d_inode;
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struct jffs_raw_inode raw_inode;
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struct jffs_control *c;
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struct jffs_fmcontrol *fmc;
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struct jffs_file *f;
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struct jffs_node *new_node;
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int update_all;
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int res = 0;
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int recoverable = 0;
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lock_kernel();
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if ((res = inode_change_ok(inode, iattr)))
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goto out;
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c = (struct jffs_control *)inode->i_sb->s_fs_info;
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fmc = c->fmc;
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D3(printk (KERN_NOTICE "notify_change(): down biglock\n"));
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down(&fmc->biglock);
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f = jffs_find_file(c, inode->i_ino);
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ASSERT(if (!f) {
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printk("jffs_setattr(): Invalid inode number: %lu\n",
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inode->i_ino);
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D3(printk (KERN_NOTICE "notify_change(): up biglock\n"));
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up(&fmc->biglock);
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res = -EINVAL;
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goto out;
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});
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D1(printk("***jffs_setattr(): file: \"%s\", ino: %u\n",
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f->name, f->ino));
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update_all = iattr->ia_valid & ATTR_FORCE;
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if ( (update_all || iattr->ia_valid & ATTR_SIZE)
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&& (iattr->ia_size + 128 < f->size) ) {
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/* We're shrinking the file by more than 128 bytes.
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We'll be able to GC and recover this space, so
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allow it to go into the reserved space. */
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recoverable = 1;
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}
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if (!(new_node = jffs_alloc_node())) {
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D(printk("jffs_setattr(): Allocation failed!\n"));
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D3(printk (KERN_NOTICE "notify_change(): up biglock\n"));
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up(&fmc->biglock);
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res = -ENOMEM;
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goto out;
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}
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new_node->data_offset = 0;
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new_node->removed_size = 0;
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raw_inode.magic = JFFS_MAGIC_BITMASK;
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raw_inode.ino = f->ino;
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raw_inode.pino = f->pino;
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raw_inode.mode = f->mode;
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raw_inode.uid = f->uid;
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raw_inode.gid = f->gid;
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raw_inode.atime = f->atime;
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raw_inode.mtime = f->mtime;
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raw_inode.ctime = f->ctime;
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raw_inode.dsize = 0;
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raw_inode.offset = 0;
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raw_inode.rsize = 0;
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raw_inode.dsize = 0;
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raw_inode.nsize = f->nsize;
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raw_inode.nlink = f->nlink;
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raw_inode.spare = 0;
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raw_inode.rename = 0;
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raw_inode.deleted = 0;
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if (update_all || iattr->ia_valid & ATTR_MODE) {
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raw_inode.mode = iattr->ia_mode;
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inode->i_mode = iattr->ia_mode;
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}
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if (update_all || iattr->ia_valid & ATTR_UID) {
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raw_inode.uid = iattr->ia_uid;
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inode->i_uid = iattr->ia_uid;
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}
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if (update_all || iattr->ia_valid & ATTR_GID) {
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raw_inode.gid = iattr->ia_gid;
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inode->i_gid = iattr->ia_gid;
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}
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if (update_all || iattr->ia_valid & ATTR_SIZE) {
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int len;
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D1(printk("jffs_notify_change(): Changing size "
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"to %lu bytes!\n", (long)iattr->ia_size));
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raw_inode.offset = iattr->ia_size;
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/* Calculate how many bytes need to be removed from
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the end. */
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if (f->size < iattr->ia_size) {
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len = 0;
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}
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else {
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len = f->size - iattr->ia_size;
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}
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raw_inode.rsize = len;
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/* The updated node will be a removal node, with
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base at the new size and size of the nbr of bytes
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to be removed. */
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new_node->data_offset = iattr->ia_size;
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new_node->removed_size = len;
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inode->i_size = iattr->ia_size;
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inode->i_blocks = (inode->i_size + 511) >> 9;
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if (len) {
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invalidate_inode_pages(inode->i_mapping);
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}
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inode->i_ctime = CURRENT_TIME_SEC;
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inode->i_mtime = inode->i_ctime;
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}
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if (update_all || iattr->ia_valid & ATTR_ATIME) {
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raw_inode.atime = iattr->ia_atime.tv_sec;
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inode->i_atime = iattr->ia_atime;
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}
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if (update_all || iattr->ia_valid & ATTR_MTIME) {
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raw_inode.mtime = iattr->ia_mtime.tv_sec;
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inode->i_mtime = iattr->ia_mtime;
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}
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if (update_all || iattr->ia_valid & ATTR_CTIME) {
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raw_inode.ctime = iattr->ia_ctime.tv_sec;
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inode->i_ctime = iattr->ia_ctime;
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}
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/* Write this node to the flash. */
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if ((res = jffs_write_node(c, new_node, &raw_inode, f->name, NULL, recoverable, f)) < 0) {
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D(printk("jffs_notify_change(): The write failed!\n"));
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jffs_free_node(new_node);
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D3(printk (KERN_NOTICE "n_c(): up biglock\n"));
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up(&c->fmc->biglock);
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goto out;
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}
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jffs_insert_node(c, f, &raw_inode, NULL, new_node);
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mark_inode_dirty(inode);
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D3(printk (KERN_NOTICE "n_c(): up biglock\n"));
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up(&c->fmc->biglock);
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out:
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unlock_kernel();
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return res;
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} /* jffs_notify_change() */
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static struct inode *
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jffs_new_inode(const struct inode * dir, struct jffs_raw_inode *raw_inode,
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int * err)
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{
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struct super_block * sb;
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struct inode * inode;
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struct jffs_control *c;
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struct jffs_file *f;
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sb = dir->i_sb;
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inode = new_inode(sb);
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if (!inode) {
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*err = -ENOMEM;
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return NULL;
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}
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c = (struct jffs_control *)sb->s_fs_info;
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inode->i_ino = raw_inode->ino;
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inode->i_mode = raw_inode->mode;
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inode->i_nlink = raw_inode->nlink;
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inode->i_uid = raw_inode->uid;
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inode->i_gid = raw_inode->gid;
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inode->i_size = raw_inode->dsize;
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inode->i_atime.tv_sec = raw_inode->atime;
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inode->i_mtime.tv_sec = raw_inode->mtime;
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inode->i_ctime.tv_sec = raw_inode->ctime;
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inode->i_ctime.tv_nsec = 0;
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inode->i_mtime.tv_nsec = 0;
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inode->i_atime.tv_nsec = 0;
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inode->i_blksize = PAGE_SIZE;
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inode->i_blocks = (inode->i_size + 511) >> 9;
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f = jffs_find_file(c, raw_inode->ino);
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inode->u.generic_ip = (void *)f;
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insert_inode_hash(inode);
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return inode;
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}
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/* Get statistics of the file system. */
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static int
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jffs_statfs(struct super_block *sb, struct kstatfs *buf)
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{
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struct jffs_control *c = (struct jffs_control *) sb->s_fs_info;
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struct jffs_fmcontrol *fmc;
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lock_kernel();
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fmc = c->fmc;
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D2(printk("jffs_statfs()\n"));
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buf->f_type = JFFS_MAGIC_SB_BITMASK;
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buf->f_bsize = PAGE_CACHE_SIZE;
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buf->f_blocks = (fmc->flash_size / PAGE_CACHE_SIZE)
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- (fmc->min_free_size / PAGE_CACHE_SIZE);
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buf->f_bfree = (jffs_free_size1(fmc) + jffs_free_size2(fmc) +
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fmc->dirty_size - fmc->min_free_size)
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>> PAGE_CACHE_SHIFT;
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buf->f_bavail = buf->f_bfree;
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/* Find out how many files there are in the filesystem. */
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buf->f_files = jffs_foreach_file(c, jffs_file_count);
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buf->f_ffree = buf->f_bfree;
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/* buf->f_fsid = 0; */
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buf->f_namelen = JFFS_MAX_NAME_LEN;
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unlock_kernel();
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return 0;
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}
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|
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/* Rename a file. */
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static int
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jffs_rename(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry)
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{
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struct jffs_raw_inode raw_inode;
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struct jffs_control *c;
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struct jffs_file *old_dir_f;
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struct jffs_file *new_dir_f;
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struct jffs_file *del_f;
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struct jffs_file *f;
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struct jffs_node *node;
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struct inode *inode;
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int result = 0;
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__u32 rename_data = 0;
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D2(printk("***jffs_rename()\n"));
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D(printk("jffs_rename(): old_dir: 0x%p, old name: 0x%p, "
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"new_dir: 0x%p, new name: 0x%p\n",
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old_dir, old_dentry->d_name.name,
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new_dir, new_dentry->d_name.name));
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lock_kernel();
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c = (struct jffs_control *)old_dir->i_sb->s_fs_info;
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ASSERT(if (!c) {
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printk(KERN_ERR "jffs_rename(): The old_dir inode "
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"didn't have a reference to a jffs_file struct\n");
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unlock_kernel();
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return -EIO;
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});
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|
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result = -ENOTDIR;
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if (!(old_dir_f = (struct jffs_file *)old_dir->u.generic_ip)) {
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D(printk("jffs_rename(): Old dir invalid.\n"));
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goto jffs_rename_end;
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}
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|
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/* Try to find the file to move. */
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result = -ENOENT;
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if (!(f = jffs_find_child(old_dir_f, old_dentry->d_name.name,
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old_dentry->d_name.len))) {
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goto jffs_rename_end;
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}
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|
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/* Find the new directory. */
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result = -ENOTDIR;
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if (!(new_dir_f = (struct jffs_file *)new_dir->u.generic_ip)) {
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D(printk("jffs_rename(): New dir invalid.\n"));
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goto jffs_rename_end;
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}
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D3(printk (KERN_NOTICE "rename(): down biglock\n"));
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down(&c->fmc->biglock);
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/* Create a node and initialize as much as needed. */
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result = -ENOMEM;
|
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if (!(node = jffs_alloc_node())) {
|
|
D(printk("jffs_rename(): Allocation failed: node == 0\n"));
|
|
goto jffs_rename_end;
|
|
}
|
|
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 = get_seconds();
|
|
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_dentry->d_name.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_dentry->d_name.name,
|
|
new_dentry->d_name.len))) {
|
|
raw_inode.rename = 1;
|
|
raw_inode.dsize = sizeof(__u32);
|
|
rename_data = del_f->ino;
|
|
}
|
|
|
|
/* Write the new node to the flash memory. */
|
|
if ((result = jffs_write_node(c, node, &raw_inode,
|
|
new_dentry->d_name.name,
|
|
(unsigned char*)&rename_data, 0, f)) < 0) {
|
|
D(printk("jffs_rename(): Failed to write node to flash.\n"));
|
|
jffs_free_node(node);
|
|
goto jffs_rename_end;
|
|
}
|
|
raw_inode.dsize = 0;
|
|
|
|
if (raw_inode.rename) {
|
|
/* The file with the same name must be deleted. */
|
|
//FIXME deadlock down(&c->fmc->gclock);
|
|
if ((result = jffs_remove(new_dir, new_dentry,
|
|
del_f->mode)) < 0) {
|
|
/* This is really bad. */
|
|
printk(KERN_ERR "JFFS: An error occurred in "
|
|
"rename().\n");
|
|
}
|
|
// up(&c->fmc->gclock);
|
|
}
|
|
|
|
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_dentry->d_name.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_SEC;
|
|
mark_inode_dirty(inode);
|
|
iput(inode);
|
|
}
|
|
|
|
jffs_rename_end:
|
|
D3(printk (KERN_NOTICE "rename(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return result;
|
|
} /* jffs_rename() */
|
|
|
|
|
|
/* Read the contents of a directory. Used by programs like `ls'
|
|
for instance. */
|
|
static int
|
|
jffs_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
|
{
|
|
struct jffs_file *f;
|
|
struct dentry *dentry = filp->f_dentry;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct jffs_control *c = (struct jffs_control *)inode->i_sb->s_fs_info;
|
|
int j;
|
|
int ddino;
|
|
lock_kernel();
|
|
D3(printk (KERN_NOTICE "readdir(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
|
|
D2(printk("jffs_readdir(): inode: 0x%p, filp: 0x%p\n", inode, filp));
|
|
if (filp->f_pos == 0) {
|
|
D3(printk("jffs_readdir(): \".\" %lu\n", inode->i_ino));
|
|
if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) {
|
|
D3(printk (KERN_NOTICE "readdir(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return 0;
|
|
}
|
|
filp->f_pos = 1;
|
|
}
|
|
if (filp->f_pos == 1) {
|
|
if (inode->i_ino == JFFS_MIN_INO) {
|
|
ddino = JFFS_MIN_INO;
|
|
}
|
|
else {
|
|
ddino = ((struct jffs_file *)
|
|
inode->u.generic_ip)->pino;
|
|
}
|
|
D3(printk("jffs_readdir(): \"..\" %u\n", ddino));
|
|
if (filldir(dirent, "..", 2, filp->f_pos, ddino, DT_DIR) < 0) {
|
|
D3(printk (KERN_NOTICE "readdir(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return 0;
|
|
}
|
|
filp->f_pos++;
|
|
}
|
|
f = ((struct jffs_file *)inode->u.generic_ip)->children;
|
|
|
|
j = 2;
|
|
while(f && (f->deleted || j++ < filp->f_pos )) {
|
|
f = f->sibling_next;
|
|
}
|
|
|
|
while (f) {
|
|
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, DT_UNKNOWN) < 0) {
|
|
D3(printk (KERN_NOTICE "readdir(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return 0;
|
|
}
|
|
filp->f_pos++;
|
|
do {
|
|
f = f->sibling_next;
|
|
} while(f && f->deleted);
|
|
}
|
|
D3(printk (KERN_NOTICE "readdir(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return filp->f_pos;
|
|
} /* jffs_readdir() */
|
|
|
|
|
|
/* Find a file in a directory. If the file exists, return its
|
|
corresponding dentry. */
|
|
static struct dentry *
|
|
jffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct jffs_file *d;
|
|
struct jffs_file *f;
|
|
struct jffs_control *c = (struct jffs_control *)dir->i_sb->s_fs_info;
|
|
int len;
|
|
int r = 0;
|
|
const char *name;
|
|
struct inode *inode = NULL;
|
|
|
|
len = dentry->d_name.len;
|
|
name = dentry->d_name.name;
|
|
|
|
lock_kernel();
|
|
|
|
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);
|
|
});
|
|
|
|
D3(printk (KERN_NOTICE "lookup(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
|
|
r = -ENAMETOOLONG;
|
|
if (len > JFFS_MAX_NAME_LEN) {
|
|
goto jffs_lookup_end;
|
|
}
|
|
|
|
r = -EACCES;
|
|
if (!(d = (struct jffs_file *)dir->u.generic_ip)) {
|
|
D(printk("jffs_lookup(): No such inode! (%lu)\n",
|
|
dir->i_ino));
|
|
goto jffs_lookup_end;
|
|
}
|
|
|
|
/* Get the corresponding inode to the file. */
|
|
|
|
/* iget calls jffs_read_inode, so we need to drop the biglock
|
|
before calling iget. Unfortunately, the GC has a tendency
|
|
to sneak in here, because iget sometimes calls schedule ().
|
|
*/
|
|
|
|
if ((len == 1) && (name[0] == '.')) {
|
|
D3(printk (KERN_NOTICE "lookup(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
if (!(inode = iget(dir->i_sb, d->ino))) {
|
|
D(printk("jffs_lookup(): . iget() ==> NULL\n"));
|
|
goto jffs_lookup_end_no_biglock;
|
|
}
|
|
D3(printk (KERN_NOTICE "lookup(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
} else if ((len == 2) && (name[0] == '.') && (name[1] == '.')) {
|
|
D3(printk (KERN_NOTICE "lookup(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
if (!(inode = iget(dir->i_sb, d->pino))) {
|
|
D(printk("jffs_lookup(): .. iget() ==> NULL\n"));
|
|
goto jffs_lookup_end_no_biglock;
|
|
}
|
|
D3(printk (KERN_NOTICE "lookup(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
} else if ((f = jffs_find_child(d, name, len))) {
|
|
D3(printk (KERN_NOTICE "lookup(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
if (!(inode = iget(dir->i_sb, f->ino))) {
|
|
D(printk("jffs_lookup(): iget() ==> NULL\n"));
|
|
goto jffs_lookup_end_no_biglock;
|
|
}
|
|
D3(printk (KERN_NOTICE "lookup(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
} 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));
|
|
inode = NULL;
|
|
}
|
|
|
|
d_add(dentry, inode);
|
|
D3(printk (KERN_NOTICE "lookup(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return NULL;
|
|
|
|
jffs_lookup_end:
|
|
D3(printk (KERN_NOTICE "lookup(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
|
|
jffs_lookup_end_no_biglock:
|
|
unlock_kernel();
|
|
return ERR_PTR(r);
|
|
} /* jffs_lookup() */
|
|
|
|
|
|
/* Try to read a page of data from a file. */
|
|
static int
|
|
jffs_do_readpage_nolock(struct file *file, struct page *page)
|
|
{
|
|
void *buf;
|
|
unsigned long read_len;
|
|
int result;
|
|
struct inode *inode = (struct inode*)page->mapping->host;
|
|
struct jffs_file *f = (struct jffs_file *)inode->u.generic_ip;
|
|
struct jffs_control *c = (struct jffs_control *)inode->i_sb->s_fs_info;
|
|
int r;
|
|
loff_t offset;
|
|
|
|
D2(printk("***jffs_readpage(): file = \"%s\", page->index = %lu\n",
|
|
(f->name ? f->name : ""), (long)page->index));
|
|
|
|
get_page(page);
|
|
/* Don't SetPageLocked(page), should be locked already */
|
|
ClearPageUptodate(page);
|
|
ClearPageError(page);
|
|
|
|
D3(printk (KERN_NOTICE "readpage(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
|
|
read_len = 0;
|
|
result = 0;
|
|
offset = page->index << PAGE_CACHE_SHIFT;
|
|
|
|
kmap(page);
|
|
buf = page_address(page);
|
|
if (offset < inode->i_size) {
|
|
read_len = min_t(long, inode->i_size - offset, PAGE_SIZE);
|
|
r = jffs_read_data(f, buf, offset, read_len);
|
|
if (r != read_len) {
|
|
result = -EIO;
|
|
D(
|
|
printk("***jffs_readpage(): Read error! "
|
|
"Wanted to read %lu bytes but only "
|
|
"read %d bytes.\n", read_len, r);
|
|
);
|
|
}
|
|
|
|
}
|
|
|
|
/* This handles the case of partial or no read in above */
|
|
if(read_len < PAGE_SIZE)
|
|
memset(buf + read_len, 0, PAGE_SIZE - read_len);
|
|
flush_dcache_page(page);
|
|
kunmap(page);
|
|
|
|
D3(printk (KERN_NOTICE "readpage(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
|
|
if (result) {
|
|
SetPageError(page);
|
|
}else {
|
|
SetPageUptodate(page);
|
|
}
|
|
|
|
page_cache_release(page);
|
|
|
|
D3(printk("jffs_readpage(): Leaving...\n"));
|
|
|
|
return result;
|
|
} /* jffs_do_readpage_nolock() */
|
|
|
|
static int jffs_readpage(struct file *file, struct page *page)
|
|
{
|
|
int ret = jffs_do_readpage_nolock(file, page);
|
|
unlock_page(page);
|
|
return ret;
|
|
}
|
|
|
|
/* Create a new directory. */
|
|
static int
|
|
jffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
|
{
|
|
struct jffs_raw_inode raw_inode;
|
|
struct jffs_control *c;
|
|
struct jffs_node *node;
|
|
struct jffs_file *dir_f;
|
|
struct inode *inode;
|
|
int dir_mode;
|
|
int result = 0;
|
|
int err;
|
|
|
|
D1({
|
|
int len = dentry->d_name.len;
|
|
char *_name = (char *) kmalloc(len + 1, GFP_KERNEL);
|
|
memcpy(_name, dentry->d_name.name, len);
|
|
_name[len] = '\0';
|
|
printk("***jffs_mkdir(): dir = 0x%p, name = \"%s\", "
|
|
"len = %d, mode = 0x%08x\n", dir, _name, len, mode);
|
|
kfree(_name);
|
|
});
|
|
|
|
lock_kernel();
|
|
dir_f = (struct jffs_file *)dir->u.generic_ip;
|
|
|
|
ASSERT(if (!dir_f) {
|
|
printk(KERN_ERR "jffs_mkdir(): No reference to a "
|
|
"jffs_file struct in inode.\n");
|
|
unlock_kernel();
|
|
return -EIO;
|
|
});
|
|
|
|
c = dir_f->c;
|
|
D3(printk (KERN_NOTICE "mkdir(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
|
|
dir_mode = S_IFDIR | (mode & (S_IRWXUGO|S_ISVTX)
|
|
& ~current->fs->umask);
|
|
if (dir->i_mode & S_ISGID) {
|
|
dir_mode |= S_ISGID;
|
|
}
|
|
|
|
/* Create a node and initialize it as much as needed. */
|
|
if (!(node = jffs_alloc_node())) {
|
|
D(printk("jffs_mkdir(): Allocation failed: node == 0\n"));
|
|
result = -ENOMEM;
|
|
goto jffs_mkdir_end;
|
|
}
|
|
node->data_offset = 0;
|
|
node->removed_size = 0;
|
|
|
|
/* Initialize the raw inode. */
|
|
raw_inode.magic = JFFS_MAGIC_BITMASK;
|
|
raw_inode.ino = c->next_ino++;
|
|
raw_inode.pino = dir_f->ino;
|
|
raw_inode.version = 1;
|
|
raw_inode.mode = dir_mode;
|
|
raw_inode.uid = current->fsuid;
|
|
raw_inode.gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
|
|
/* raw_inode.gid = current->fsgid; */
|
|
raw_inode.atime = get_seconds();
|
|
raw_inode.mtime = raw_inode.atime;
|
|
raw_inode.ctime = raw_inode.atime;
|
|
raw_inode.offset = 0;
|
|
raw_inode.dsize = 0;
|
|
raw_inode.rsize = 0;
|
|
raw_inode.nsize = dentry->d_name.len;
|
|
raw_inode.nlink = 1;
|
|
raw_inode.spare = 0;
|
|
raw_inode.rename = 0;
|
|
raw_inode.deleted = 0;
|
|
|
|
/* Write the new node to the flash. */
|
|
if ((result = jffs_write_node(c, node, &raw_inode,
|
|
dentry->d_name.name, NULL, 0, NULL)) < 0) {
|
|
D(printk("jffs_mkdir(): jffs_write_node() failed.\n"));
|
|
jffs_free_node(node);
|
|
goto jffs_mkdir_end;
|
|
}
|
|
|
|
/* Insert the new node into the file system. */
|
|
if ((result = jffs_insert_node(c, NULL, &raw_inode, dentry->d_name.name,
|
|
node)) < 0) {
|
|
goto jffs_mkdir_end;
|
|
}
|
|
|
|
inode = jffs_new_inode(dir, &raw_inode, &err);
|
|
if (inode == NULL) {
|
|
result = err;
|
|
goto jffs_mkdir_end;
|
|
}
|
|
|
|
inode->i_op = &jffs_dir_inode_operations;
|
|
inode->i_fop = &jffs_dir_operations;
|
|
|
|
mark_inode_dirty(dir);
|
|
d_instantiate(dentry, inode);
|
|
|
|
result = 0;
|
|
jffs_mkdir_end:
|
|
D3(printk (KERN_NOTICE "mkdir(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return result;
|
|
} /* jffs_mkdir() */
|
|
|
|
|
|
/* Remove a directory. */
|
|
static int
|
|
jffs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct jffs_control *c = (struct jffs_control *)dir->i_sb->s_fs_info;
|
|
int ret;
|
|
D3(printk("***jffs_rmdir()\n"));
|
|
D3(printk (KERN_NOTICE "rmdir(): down biglock\n"));
|
|
lock_kernel();
|
|
down(&c->fmc->biglock);
|
|
ret = jffs_remove(dir, dentry, S_IFDIR);
|
|
D3(printk (KERN_NOTICE "rmdir(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* Remove any kind of file except for directories. */
|
|
static int
|
|
jffs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct jffs_control *c = (struct jffs_control *)dir->i_sb->s_fs_info;
|
|
int ret;
|
|
|
|
lock_kernel();
|
|
D3(printk("***jffs_unlink()\n"));
|
|
D3(printk (KERN_NOTICE "unlink(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
ret = jffs_remove(dir, dentry, 0);
|
|
D3(printk (KERN_NOTICE "unlink(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* Remove a JFFS entry, i.e. plain files, directories, etc. Here we
|
|
shouldn't test for free space on the device. */
|
|
static int
|
|
jffs_remove(struct inode *dir, struct dentry *dentry, int type)
|
|
{
|
|
struct jffs_raw_inode raw_inode;
|
|
struct jffs_control *c;
|
|
struct jffs_file *dir_f; /* The file-to-remove's parent. */
|
|
struct jffs_file *del_f; /* The file to remove. */
|
|
struct jffs_node *del_node;
|
|
struct inode *inode = NULL;
|
|
int result = 0;
|
|
|
|
D1({
|
|
int len = dentry->d_name.len;
|
|
const char *name = dentry->d_name.name;
|
|
char *_name = (char *) kmalloc(len + 1, GFP_KERNEL);
|
|
memcpy(_name, name, len);
|
|
_name[len] = '\0';
|
|
printk("***jffs_remove(): file = \"%s\", ino = %ld\n", _name, dentry->d_inode->i_ino);
|
|
kfree(_name);
|
|
});
|
|
|
|
dir_f = (struct jffs_file *) dir->u.generic_ip;
|
|
c = dir_f->c;
|
|
|
|
result = -ENOENT;
|
|
if (!(del_f = jffs_find_child(dir_f, dentry->d_name.name,
|
|
dentry->d_name.len))) {
|
|
D(printk("jffs_remove(): jffs_find_child() failed.\n"));
|
|
goto jffs_remove_end;
|
|
}
|
|
|
|
if (S_ISDIR(type)) {
|
|
struct jffs_file *child = del_f->children;
|
|
while(child) {
|
|
if( !child->deleted ) {
|
|
result = -ENOTEMPTY;
|
|
goto jffs_remove_end;
|
|
}
|
|
child = child->sibling_next;
|
|
}
|
|
}
|
|
else if (S_ISDIR(del_f->mode)) {
|
|
D(printk("jffs_remove(): node is a directory "
|
|
"but it shouldn't be.\n"));
|
|
result = -EPERM;
|
|
goto jffs_remove_end;
|
|
}
|
|
|
|
inode = dentry->d_inode;
|
|
|
|
result = -EIO;
|
|
if (del_f->ino != inode->i_ino)
|
|
goto jffs_remove_end;
|
|
|
|
if (!inode->i_nlink) {
|
|
printk("Deleting nonexistent file inode: %lu, nlink: %d\n",
|
|
inode->i_ino, inode->i_nlink);
|
|
inode->i_nlink=1;
|
|
}
|
|
|
|
/* Create a node for the deletion. */
|
|
result = -ENOMEM;
|
|
if (!(del_node = jffs_alloc_node())) {
|
|
D(printk("jffs_remove(): Allocation failed!\n"));
|
|
goto jffs_remove_end;
|
|
}
|
|
del_node->data_offset = 0;
|
|
del_node->removed_size = 0;
|
|
|
|
/* Initialize the raw inode. */
|
|
raw_inode.magic = JFFS_MAGIC_BITMASK;
|
|
raw_inode.ino = del_f->ino;
|
|
raw_inode.pino = del_f->pino;
|
|
/* raw_inode.version = del_f->highest_version + 1; */
|
|
raw_inode.mode = del_f->mode;
|
|
raw_inode.uid = current->fsuid;
|
|
raw_inode.gid = current->fsgid;
|
|
raw_inode.atime = get_seconds();
|
|
raw_inode.mtime = del_f->mtime;
|
|
raw_inode.ctime = raw_inode.atime;
|
|
raw_inode.offset = 0;
|
|
raw_inode.dsize = 0;
|
|
raw_inode.rsize = 0;
|
|
raw_inode.nsize = 0;
|
|
raw_inode.nlink = del_f->nlink;
|
|
raw_inode.spare = 0;
|
|
raw_inode.rename = 0;
|
|
raw_inode.deleted = 1;
|
|
|
|
/* Write the new node to the flash memory. */
|
|
if (jffs_write_node(c, del_node, &raw_inode, NULL, NULL, 1, del_f) < 0) {
|
|
jffs_free_node(del_node);
|
|
result = -EIO;
|
|
goto jffs_remove_end;
|
|
}
|
|
|
|
/* Update the file. This operation will make the file disappear
|
|
from the in-memory file system structures. */
|
|
jffs_insert_node(c, del_f, &raw_inode, NULL, del_node);
|
|
|
|
dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
|
|
mark_inode_dirty(dir);
|
|
inode->i_nlink--;
|
|
inode->i_ctime = dir->i_ctime;
|
|
mark_inode_dirty(inode);
|
|
|
|
d_delete(dentry); /* This also frees the inode */
|
|
|
|
result = 0;
|
|
jffs_remove_end:
|
|
return result;
|
|
} /* jffs_remove() */
|
|
|
|
|
|
static int
|
|
jffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
|
|
{
|
|
struct jffs_raw_inode raw_inode;
|
|
struct jffs_file *dir_f;
|
|
struct jffs_node *node = NULL;
|
|
struct jffs_control *c;
|
|
struct inode *inode;
|
|
int result = 0;
|
|
u16 data = old_encode_dev(rdev);
|
|
int err;
|
|
|
|
D1(printk("***jffs_mknod()\n"));
|
|
|
|
if (!old_valid_dev(rdev))
|
|
return -EINVAL;
|
|
lock_kernel();
|
|
dir_f = (struct jffs_file *)dir->u.generic_ip;
|
|
c = dir_f->c;
|
|
|
|
D3(printk (KERN_NOTICE "mknod(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
|
|
/* Create and initialize a new node. */
|
|
if (!(node = jffs_alloc_node())) {
|
|
D(printk("jffs_mknod(): Allocation failed!\n"));
|
|
result = -ENOMEM;
|
|
goto jffs_mknod_err;
|
|
}
|
|
node->data_offset = 0;
|
|
node->removed_size = 0;
|
|
|
|
/* Initialize the raw inode. */
|
|
raw_inode.magic = JFFS_MAGIC_BITMASK;
|
|
raw_inode.ino = c->next_ino++;
|
|
raw_inode.pino = dir_f->ino;
|
|
raw_inode.version = 1;
|
|
raw_inode.mode = mode;
|
|
raw_inode.uid = current->fsuid;
|
|
raw_inode.gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
|
|
/* raw_inode.gid = current->fsgid; */
|
|
raw_inode.atime = get_seconds();
|
|
raw_inode.mtime = raw_inode.atime;
|
|
raw_inode.ctime = raw_inode.atime;
|
|
raw_inode.offset = 0;
|
|
raw_inode.dsize = 2;
|
|
raw_inode.rsize = 0;
|
|
raw_inode.nsize = dentry->d_name.len;
|
|
raw_inode.nlink = 1;
|
|
raw_inode.spare = 0;
|
|
raw_inode.rename = 0;
|
|
raw_inode.deleted = 0;
|
|
|
|
/* Write the new node to the flash. */
|
|
if ((err = jffs_write_node(c, node, &raw_inode, dentry->d_name.name,
|
|
(unsigned char *)&data, 0, NULL)) < 0) {
|
|
D(printk("jffs_mknod(): jffs_write_node() failed.\n"));
|
|
result = err;
|
|
goto jffs_mknod_err;
|
|
}
|
|
|
|
/* Insert the new node into the file system. */
|
|
if ((err = jffs_insert_node(c, NULL, &raw_inode, dentry->d_name.name,
|
|
node)) < 0) {
|
|
result = err;
|
|
goto jffs_mknod_end;
|
|
}
|
|
|
|
inode = jffs_new_inode(dir, &raw_inode, &err);
|
|
if (inode == NULL) {
|
|
result = err;
|
|
goto jffs_mknod_end;
|
|
}
|
|
|
|
init_special_inode(inode, mode, rdev);
|
|
|
|
d_instantiate(dentry, inode);
|
|
|
|
goto jffs_mknod_end;
|
|
|
|
jffs_mknod_err:
|
|
if (node) {
|
|
jffs_free_node(node);
|
|
}
|
|
|
|
jffs_mknod_end:
|
|
D3(printk (KERN_NOTICE "mknod(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return result;
|
|
} /* jffs_mknod() */
|
|
|
|
|
|
static int
|
|
jffs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
|
|
{
|
|
struct jffs_raw_inode raw_inode;
|
|
struct jffs_control *c;
|
|
struct jffs_file *dir_f;
|
|
struct jffs_node *node;
|
|
struct inode *inode;
|
|
|
|
int symname_len = strlen(symname);
|
|
int err;
|
|
|
|
lock_kernel();
|
|
D1({
|
|
int len = dentry->d_name.len;
|
|
char *_name = (char *)kmalloc(len + 1, GFP_KERNEL);
|
|
char *_symname = (char *)kmalloc(symname_len + 1, GFP_KERNEL);
|
|
memcpy(_name, dentry->d_name.name, len);
|
|
_name[len] = '\0';
|
|
memcpy(_symname, symname, symname_len);
|
|
_symname[symname_len] = '\0';
|
|
printk("***jffs_symlink(): dir = 0x%p, "
|
|
"dentry->dname.name = \"%s\", "
|
|
"symname = \"%s\"\n", dir, _name, _symname);
|
|
kfree(_name);
|
|
kfree(_symname);
|
|
});
|
|
|
|
dir_f = (struct jffs_file *)dir->u.generic_ip;
|
|
ASSERT(if (!dir_f) {
|
|
printk(KERN_ERR "jffs_symlink(): No reference to a "
|
|
"jffs_file struct in inode.\n");
|
|
unlock_kernel();
|
|
return -EIO;
|
|
});
|
|
|
|
c = dir_f->c;
|
|
|
|
/* Create a node and initialize it as much as needed. */
|
|
if (!(node = jffs_alloc_node())) {
|
|
D(printk("jffs_symlink(): Allocation failed: node = NULL\n"));
|
|
unlock_kernel();
|
|
return -ENOMEM;
|
|
}
|
|
D3(printk (KERN_NOTICE "symlink(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
|
|
node->data_offset = 0;
|
|
node->removed_size = 0;
|
|
|
|
/* Initialize the raw inode. */
|
|
raw_inode.magic = JFFS_MAGIC_BITMASK;
|
|
raw_inode.ino = c->next_ino++;
|
|
raw_inode.pino = dir_f->ino;
|
|
raw_inode.version = 1;
|
|
raw_inode.mode = S_IFLNK | S_IRWXUGO;
|
|
raw_inode.uid = current->fsuid;
|
|
raw_inode.gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
|
|
raw_inode.atime = get_seconds();
|
|
raw_inode.mtime = raw_inode.atime;
|
|
raw_inode.ctime = raw_inode.atime;
|
|
raw_inode.offset = 0;
|
|
raw_inode.dsize = symname_len;
|
|
raw_inode.rsize = 0;
|
|
raw_inode.nsize = dentry->d_name.len;
|
|
raw_inode.nlink = 1;
|
|
raw_inode.spare = 0;
|
|
raw_inode.rename = 0;
|
|
raw_inode.deleted = 0;
|
|
|
|
/* Write the new node to the flash. */
|
|
if ((err = jffs_write_node(c, node, &raw_inode, dentry->d_name.name,
|
|
(const unsigned char *)symname, 0, NULL)) < 0) {
|
|
D(printk("jffs_symlink(): jffs_write_node() failed.\n"));
|
|
jffs_free_node(node);
|
|
goto jffs_symlink_end;
|
|
}
|
|
|
|
/* Insert the new node into the file system. */
|
|
if ((err = jffs_insert_node(c, NULL, &raw_inode, dentry->d_name.name,
|
|
node)) < 0) {
|
|
goto jffs_symlink_end;
|
|
}
|
|
|
|
inode = jffs_new_inode(dir, &raw_inode, &err);
|
|
if (inode == NULL) {
|
|
goto jffs_symlink_end;
|
|
}
|
|
err = 0;
|
|
inode->i_op = &page_symlink_inode_operations;
|
|
inode->i_mapping->a_ops = &jffs_address_operations;
|
|
|
|
d_instantiate(dentry, inode);
|
|
jffs_symlink_end:
|
|
D3(printk (KERN_NOTICE "symlink(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return err;
|
|
} /* jffs_symlink() */
|
|
|
|
|
|
/* Create an inode inside a JFFS directory (dir) and return it.
|
|
*
|
|
* By the time this is called, we already have created
|
|
* the directory cache entry for the new file, but it
|
|
* is so far negative - it has no inode.
|
|
*
|
|
* If the create succeeds, we fill in the inode information
|
|
* with d_instantiate().
|
|
*/
|
|
static int
|
|
jffs_create(struct inode *dir, struct dentry *dentry, int mode,
|
|
struct nameidata *nd)
|
|
{
|
|
struct jffs_raw_inode raw_inode;
|
|
struct jffs_control *c;
|
|
struct jffs_node *node;
|
|
struct jffs_file *dir_f; /* JFFS representation of the directory. */
|
|
struct inode *inode;
|
|
int err;
|
|
|
|
lock_kernel();
|
|
D1({
|
|
int len = dentry->d_name.len;
|
|
char *s = (char *)kmalloc(len + 1, GFP_KERNEL);
|
|
memcpy(s, dentry->d_name.name, len);
|
|
s[len] = '\0';
|
|
printk("jffs_create(): dir: 0x%p, name: \"%s\"\n", dir, s);
|
|
kfree(s);
|
|
});
|
|
|
|
dir_f = (struct jffs_file *)dir->u.generic_ip;
|
|
ASSERT(if (!dir_f) {
|
|
printk(KERN_ERR "jffs_create(): No reference to a "
|
|
"jffs_file struct in inode.\n");
|
|
unlock_kernel();
|
|
return -EIO;
|
|
});
|
|
|
|
c = dir_f->c;
|
|
|
|
/* Create a node and initialize as much as needed. */
|
|
if (!(node = jffs_alloc_node())) {
|
|
D(printk("jffs_create(): Allocation failed: node == 0\n"));
|
|
unlock_kernel();
|
|
return -ENOMEM;
|
|
}
|
|
D3(printk (KERN_NOTICE "create(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
|
|
node->data_offset = 0;
|
|
node->removed_size = 0;
|
|
|
|
/* Initialize the raw inode. */
|
|
raw_inode.magic = JFFS_MAGIC_BITMASK;
|
|
raw_inode.ino = c->next_ino++;
|
|
raw_inode.pino = dir_f->ino;
|
|
raw_inode.version = 1;
|
|
raw_inode.mode = mode;
|
|
raw_inode.uid = current->fsuid;
|
|
raw_inode.gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
|
|
raw_inode.atime = get_seconds();
|
|
raw_inode.mtime = raw_inode.atime;
|
|
raw_inode.ctime = raw_inode.atime;
|
|
raw_inode.offset = 0;
|
|
raw_inode.dsize = 0;
|
|
raw_inode.rsize = 0;
|
|
raw_inode.nsize = dentry->d_name.len;
|
|
raw_inode.nlink = 1;
|
|
raw_inode.spare = 0;
|
|
raw_inode.rename = 0;
|
|
raw_inode.deleted = 0;
|
|
|
|
/* Write the new node to the flash. */
|
|
if ((err = jffs_write_node(c, node, &raw_inode,
|
|
dentry->d_name.name, NULL, 0, NULL)) < 0) {
|
|
D(printk("jffs_create(): jffs_write_node() failed.\n"));
|
|
jffs_free_node(node);
|
|
goto jffs_create_end;
|
|
}
|
|
|
|
/* Insert the new node into the file system. */
|
|
if ((err = jffs_insert_node(c, NULL, &raw_inode, dentry->d_name.name,
|
|
node)) < 0) {
|
|
goto jffs_create_end;
|
|
}
|
|
|
|
/* Initialize an inode. */
|
|
inode = jffs_new_inode(dir, &raw_inode, &err);
|
|
if (inode == NULL) {
|
|
goto jffs_create_end;
|
|
}
|
|
err = 0;
|
|
inode->i_op = &jffs_file_inode_operations;
|
|
inode->i_fop = &jffs_file_operations;
|
|
inode->i_mapping->a_ops = &jffs_address_operations;
|
|
inode->i_mapping->nrpages = 0;
|
|
|
|
d_instantiate(dentry, inode);
|
|
jffs_create_end:
|
|
D3(printk (KERN_NOTICE "create(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
unlock_kernel();
|
|
return err;
|
|
} /* jffs_create() */
|
|
|
|
|
|
/* Write, append or rewrite data to an existing file. */
|
|
static ssize_t
|
|
jffs_file_write(struct file *filp, const char *buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
struct jffs_raw_inode raw_inode;
|
|
struct jffs_control *c;
|
|
struct jffs_file *f;
|
|
struct jffs_node *node;
|
|
struct dentry *dentry = filp->f_dentry;
|
|
struct inode *inode = dentry->d_inode;
|
|
int recoverable = 0;
|
|
size_t written = 0;
|
|
__u32 thiscount = count;
|
|
loff_t pos = *ppos;
|
|
int err;
|
|
|
|
inode = filp->f_dentry->d_inode;
|
|
|
|
D2(printk("***jffs_file_write(): inode: 0x%p (ino: %lu), "
|
|
"filp: 0x%p, buf: 0x%p, count: %d\n",
|
|
inode, inode->i_ino, filp, buf, count));
|
|
|
|
#if 0
|
|
if (inode->i_sb->s_flags & MS_RDONLY) {
|
|
D(printk("jffs_file_write(): MS_RDONLY\n"));
|
|
err = -EROFS;
|
|
goto out_isem;
|
|
}
|
|
#endif
|
|
err = -EINVAL;
|
|
|
|
if (!S_ISREG(inode->i_mode)) {
|
|
D(printk("jffs_file_write(): inode->i_mode == 0x%08x\n",
|
|
inode->i_mode));
|
|
goto out_isem;
|
|
}
|
|
|
|
if (!(f = (struct jffs_file *)inode->u.generic_ip)) {
|
|
D(printk("jffs_file_write(): inode->u.generic_ip = 0x%p\n",
|
|
inode->u.generic_ip));
|
|
goto out_isem;
|
|
}
|
|
|
|
c = f->c;
|
|
|
|
/*
|
|
* This will never trigger with sane page sizes. leave it in
|
|
* anyway, since I'm thinking about how to merge larger writes
|
|
* (the current idea is to poke a thread that does the actual
|
|
* I/O and starts by doing a down(&inode->i_sem). then we
|
|
* would need to get the page cache pages and have a list of
|
|
* I/O requests and do write-merging here.
|
|
* -- prumpf
|
|
*/
|
|
thiscount = min(c->fmc->max_chunk_size - sizeof(struct jffs_raw_inode), count);
|
|
|
|
D3(printk (KERN_NOTICE "file_write(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
|
|
/* Urgh. POSIX says we can do short writes if we feel like it.
|
|
* In practice, we can't. Nothing will cope. So we loop until
|
|
* we're done.
|
|
*
|
|
* <_Anarchy_> posix and reality are not interconnected on this issue
|
|
*/
|
|
while (count) {
|
|
/* Things are going to be written so we could allocate and
|
|
initialize the necessary data structures now. */
|
|
if (!(node = jffs_alloc_node())) {
|
|
D(printk("jffs_file_write(): node == 0\n"));
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
node->data_offset = pos;
|
|
node->removed_size = 0;
|
|
|
|
/* Initialize the raw inode. */
|
|
raw_inode.magic = JFFS_MAGIC_BITMASK;
|
|
raw_inode.ino = f->ino;
|
|
raw_inode.pino = f->pino;
|
|
|
|
raw_inode.mode = f->mode;
|
|
|
|
raw_inode.uid = f->uid;
|
|
raw_inode.gid = f->gid;
|
|
raw_inode.atime = get_seconds();
|
|
raw_inode.mtime = raw_inode.atime;
|
|
raw_inode.ctime = f->ctime;
|
|
raw_inode.offset = pos;
|
|
raw_inode.dsize = thiscount;
|
|
raw_inode.rsize = 0;
|
|
raw_inode.nsize = f->nsize;
|
|
raw_inode.nlink = f->nlink;
|
|
raw_inode.spare = 0;
|
|
raw_inode.rename = 0;
|
|
raw_inode.deleted = 0;
|
|
|
|
if (pos < f->size) {
|
|
node->removed_size = raw_inode.rsize = min(thiscount, (__u32)(f->size - pos));
|
|
|
|
/* If this node is going entirely over the top of old data,
|
|
we can allow it to go into the reserved space, because
|
|
we know that GC can reclaim the space later.
|
|
*/
|
|
if (pos + thiscount < f->size) {
|
|
/* If all the data we're overwriting are _real_,
|
|
not just holes, then:
|
|
recoverable = 1;
|
|
*/
|
|
}
|
|
}
|
|
|
|
/* Write the new node to the flash. */
|
|
/* NOTE: We would be quite happy if jffs_write_node() wrote a
|
|
smaller node than we were expecting. There's no need for it
|
|
to waste the space at the end of the flash just because it's
|
|
a little smaller than what we asked for. But that's a whole
|
|
new can of worms which I'm not going to open this week.
|
|
-- dwmw2.
|
|
*/
|
|
if ((err = jffs_write_node(c, node, &raw_inode, f->name,
|
|
(const unsigned char *)buf,
|
|
recoverable, f)) < 0) {
|
|
D(printk("jffs_file_write(): jffs_write_node() failed.\n"));
|
|
jffs_free_node(node);
|
|
goto out;
|
|
}
|
|
|
|
written += err;
|
|
buf += err;
|
|
count -= err;
|
|
pos += err;
|
|
|
|
/* Insert the new node into the file system. */
|
|
if ((err = jffs_insert_node(c, f, &raw_inode, NULL, node)) < 0) {
|
|
goto out;
|
|
}
|
|
|
|
D3(printk("jffs_file_write(): new f_pos %ld.\n", (long)pos));
|
|
|
|
thiscount = min(c->fmc->max_chunk_size - sizeof(struct jffs_raw_inode), count);
|
|
}
|
|
out:
|
|
D3(printk (KERN_NOTICE "file_write(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
|
|
/* Fix things in the real inode. */
|
|
if (pos > inode->i_size) {
|
|
inode->i_size = pos;
|
|
inode->i_blocks = (inode->i_size + 511) >> 9;
|
|
}
|
|
inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
|
|
mark_inode_dirty(inode);
|
|
invalidate_inode_pages(inode->i_mapping);
|
|
|
|
out_isem:
|
|
return err;
|
|
} /* jffs_file_write() */
|
|
|
|
static int
|
|
jffs_prepare_write(struct file *filp, struct page *page,
|
|
unsigned from, unsigned to)
|
|
{
|
|
/* FIXME: we should detect some error conditions here */
|
|
|
|
/* Bugger that. We should make sure the page is uptodate */
|
|
if (!PageUptodate(page) && (from || to < PAGE_CACHE_SIZE))
|
|
return jffs_do_readpage_nolock(filp, page);
|
|
|
|
return 0;
|
|
} /* jffs_prepare_write() */
|
|
|
|
static int
|
|
jffs_commit_write(struct file *filp, struct page *page,
|
|
unsigned from, unsigned to)
|
|
{
|
|
void *addr = page_address(page) + from;
|
|
/* XXX: PAGE_CACHE_SHIFT or PAGE_SHIFT */
|
|
loff_t pos = (page->index<<PAGE_CACHE_SHIFT) + from;
|
|
|
|
return jffs_file_write(filp, addr, to-from, &pos);
|
|
} /* jffs_commit_write() */
|
|
|
|
/* This is our ioctl() routine. */
|
|
static int
|
|
jffs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct jffs_control *c;
|
|
int ret = 0;
|
|
|
|
D2(printk("***jffs_ioctl(): cmd = 0x%08x, arg = 0x%08lx\n",
|
|
cmd, arg));
|
|
|
|
if (!(c = (struct jffs_control *)inode->i_sb->s_fs_info)) {
|
|
printk(KERN_ERR "JFFS: Bad inode in ioctl() call. "
|
|
"(cmd = 0x%08x)\n", cmd);
|
|
return -EIO;
|
|
}
|
|
D3(printk (KERN_NOTICE "ioctl(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
|
|
switch (cmd) {
|
|
case JFFS_PRINT_HASH:
|
|
jffs_print_hash_table(c);
|
|
break;
|
|
case JFFS_PRINT_TREE:
|
|
jffs_print_tree(c->root, 0);
|
|
break;
|
|
case JFFS_GET_STATUS:
|
|
{
|
|
struct jffs_flash_status fst;
|
|
struct jffs_fmcontrol *fmc = c->fmc;
|
|
printk("Flash status -- ");
|
|
if (!access_ok(VERIFY_WRITE,
|
|
(struct jffs_flash_status __user *)arg,
|
|
sizeof(struct jffs_flash_status))) {
|
|
D(printk("jffs_ioctl(): Bad arg in "
|
|
"JFFS_GET_STATUS ioctl!\n"));
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
fst.size = fmc->flash_size;
|
|
fst.used = fmc->used_size;
|
|
fst.dirty = fmc->dirty_size;
|
|
fst.begin = fmc->head->offset;
|
|
fst.end = fmc->tail->offset + fmc->tail->size;
|
|
printk("size: %d, used: %d, dirty: %d, "
|
|
"begin: %d, end: %d\n",
|
|
fst.size, fst.used, fst.dirty,
|
|
fst.begin, fst.end);
|
|
if (copy_to_user((struct jffs_flash_status __user *)arg,
|
|
&fst,
|
|
sizeof(struct jffs_flash_status))) {
|
|
ret = -EFAULT;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
ret = -ENOTTY;
|
|
}
|
|
D3(printk (KERN_NOTICE "ioctl(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
return ret;
|
|
} /* jffs_ioctl() */
|
|
|
|
|
|
static struct address_space_operations jffs_address_operations = {
|
|
.readpage = jffs_readpage,
|
|
.prepare_write = jffs_prepare_write,
|
|
.commit_write = jffs_commit_write,
|
|
};
|
|
|
|
static int jffs_fsync(struct file *f, struct dentry *d, int datasync)
|
|
{
|
|
/* We currently have O_SYNC operations at all times.
|
|
Do nothing.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
|
|
static struct file_operations jffs_file_operations =
|
|
{
|
|
.open = generic_file_open,
|
|
.llseek = generic_file_llseek,
|
|
.read = generic_file_read,
|
|
.write = generic_file_write,
|
|
.ioctl = jffs_ioctl,
|
|
.mmap = generic_file_readonly_mmap,
|
|
.fsync = jffs_fsync,
|
|
.sendfile = generic_file_sendfile,
|
|
};
|
|
|
|
|
|
static struct inode_operations jffs_file_inode_operations =
|
|
{
|
|
.lookup = jffs_lookup, /* lookup */
|
|
.setattr = jffs_setattr,
|
|
};
|
|
|
|
|
|
static struct file_operations jffs_dir_operations =
|
|
{
|
|
.readdir = jffs_readdir,
|
|
};
|
|
|
|
|
|
static struct inode_operations jffs_dir_inode_operations =
|
|
{
|
|
.create = jffs_create,
|
|
.lookup = jffs_lookup,
|
|
.unlink = jffs_unlink,
|
|
.symlink = jffs_symlink,
|
|
.mkdir = jffs_mkdir,
|
|
.rmdir = jffs_rmdir,
|
|
.mknod = jffs_mknod,
|
|
.rename = jffs_rename,
|
|
.setattr = jffs_setattr,
|
|
};
|
|
|
|
|
|
/* Initialize an inode for the VFS. */
|
|
static void
|
|
jffs_read_inode(struct inode *inode)
|
|
{
|
|
struct jffs_file *f;
|
|
struct jffs_control *c;
|
|
|
|
D3(printk("jffs_read_inode(): inode->i_ino == %lu\n", inode->i_ino));
|
|
|
|
if (!inode->i_sb) {
|
|
D(printk("jffs_read_inode(): !inode->i_sb ==> "
|
|
"No super block!\n"));
|
|
return;
|
|
}
|
|
c = (struct jffs_control *)inode->i_sb->s_fs_info;
|
|
D3(printk (KERN_NOTICE "read_inode(): down biglock\n"));
|
|
down(&c->fmc->biglock);
|
|
if (!(f = jffs_find_file(c, inode->i_ino))) {
|
|
D(printk("jffs_read_inode(): No such inode (%lu).\n",
|
|
inode->i_ino));
|
|
D3(printk (KERN_NOTICE "read_inode(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
return;
|
|
}
|
|
inode->u.generic_ip = (void *)f;
|
|
inode->i_mode = f->mode;
|
|
inode->i_nlink = f->nlink;
|
|
inode->i_uid = f->uid;
|
|
inode->i_gid = f->gid;
|
|
inode->i_size = f->size;
|
|
inode->i_atime.tv_sec = f->atime;
|
|
inode->i_mtime.tv_sec = f->mtime;
|
|
inode->i_ctime.tv_sec = f->ctime;
|
|
inode->i_atime.tv_nsec =
|
|
inode->i_mtime.tv_nsec =
|
|
inode->i_ctime.tv_nsec = 0;
|
|
|
|
inode->i_blksize = PAGE_SIZE;
|
|
inode->i_blocks = (inode->i_size + 511) >> 9;
|
|
if (S_ISREG(inode->i_mode)) {
|
|
inode->i_op = &jffs_file_inode_operations;
|
|
inode->i_fop = &jffs_file_operations;
|
|
inode->i_mapping->a_ops = &jffs_address_operations;
|
|
}
|
|
else if (S_ISDIR(inode->i_mode)) {
|
|
inode->i_op = &jffs_dir_inode_operations;
|
|
inode->i_fop = &jffs_dir_operations;
|
|
}
|
|
else if (S_ISLNK(inode->i_mode)) {
|
|
inode->i_op = &page_symlink_inode_operations;
|
|
inode->i_mapping->a_ops = &jffs_address_operations;
|
|
}
|
|
else {
|
|
/* If the node is a device of some sort, then the number of
|
|
the device should be read from the flash memory and then
|
|
added to the inode's i_rdev member. */
|
|
u16 val;
|
|
jffs_read_data(f, (char *)&val, 0, 2);
|
|
init_special_inode(inode, inode->i_mode,
|
|
old_decode_dev(val));
|
|
}
|
|
|
|
D3(printk (KERN_NOTICE "read_inode(): up biglock\n"));
|
|
up(&c->fmc->biglock);
|
|
}
|
|
|
|
|
|
static void
|
|
jffs_delete_inode(struct inode *inode)
|
|
{
|
|
struct jffs_file *f;
|
|
struct jffs_control *c;
|
|
D3(printk("jffs_delete_inode(): inode->i_ino == %lu\n",
|
|
inode->i_ino));
|
|
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
lock_kernel();
|
|
inode->i_size = 0;
|
|
inode->i_blocks = 0;
|
|
inode->u.generic_ip = NULL;
|
|
clear_inode(inode);
|
|
if (inode->i_nlink == 0) {
|
|
c = (struct jffs_control *) inode->i_sb->s_fs_info;
|
|
f = (struct jffs_file *) jffs_find_file (c, inode->i_ino);
|
|
jffs_possibly_delete_file(f);
|
|
}
|
|
|
|
unlock_kernel();
|
|
}
|
|
|
|
|
|
static void
|
|
jffs_write_super(struct super_block *sb)
|
|
{
|
|
struct jffs_control *c = (struct jffs_control *)sb->s_fs_info;
|
|
lock_kernel();
|
|
jffs_garbage_collect_trigger(c);
|
|
unlock_kernel();
|
|
}
|
|
|
|
static int jffs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
*flags |= MS_NODIRATIME;
|
|
return 0;
|
|
}
|
|
|
|
static struct super_operations jffs_ops =
|
|
{
|
|
.read_inode = jffs_read_inode,
|
|
.delete_inode = jffs_delete_inode,
|
|
.put_super = jffs_put_super,
|
|
.write_super = jffs_write_super,
|
|
.statfs = jffs_statfs,
|
|
.remount_fs = jffs_remount,
|
|
};
|
|
|
|
static struct super_block *jffs_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return get_sb_bdev(fs_type, flags, dev_name, data, jffs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type jffs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "jffs",
|
|
.get_sb = jffs_get_sb,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init
|
|
init_jffs_fs(void)
|
|
{
|
|
printk(KERN_INFO "JFFS version " JFFS_VERSION_STRING
|
|
", (C) 1999, 2000 Axis Communications AB\n");
|
|
|
|
#ifdef CONFIG_JFFS_PROC_FS
|
|
jffs_proc_root = proc_mkdir("jffs", proc_root_fs);
|
|
if (!jffs_proc_root) {
|
|
printk(KERN_WARNING "cannot create /proc/jffs entry\n");
|
|
}
|
|
#endif
|
|
fm_cache = kmem_cache_create("jffs_fm", sizeof(struct jffs_fm),
|
|
0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
|
|
NULL, NULL);
|
|
if (!fm_cache) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
node_cache = kmem_cache_create("jffs_node",sizeof(struct jffs_node),
|
|
0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
|
|
NULL, NULL);
|
|
if (!node_cache) {
|
|
kmem_cache_destroy(fm_cache);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return register_filesystem(&jffs_fs_type);
|
|
}
|
|
|
|
static void __exit
|
|
exit_jffs_fs(void)
|
|
{
|
|
unregister_filesystem(&jffs_fs_type);
|
|
kmem_cache_destroy(fm_cache);
|
|
kmem_cache_destroy(node_cache);
|
|
}
|
|
|
|
module_init(init_jffs_fs)
|
|
module_exit(exit_jffs_fs)
|
|
|
|
MODULE_DESCRIPTION("The Journalling Flash File System");
|
|
MODULE_AUTHOR("Axis Communications AB.");
|
|
MODULE_LICENSE("GPL");
|