diff options
Diffstat (limited to 'fs/jffs/inode-v23.c')
| -rw-r--r-- | fs/jffs/inode-v23.c | 1847 |
1 files changed, 1847 insertions, 0 deletions
diff --git a/fs/jffs/inode-v23.c b/fs/jffs/inode-v23.c new file mode 100644 index 0000000..bfbeb4c --- /dev/null +++ b/fs/jffs/inode-v23.c @@ -0,0 +1,1847 @@ +/* + * JFFS -- Journalling Flash File System, Linux implementation. + * + * Copyright (C) 1999, 2000 Axis Communications AB. + * + * Created by Finn Hakansson <finn@axis.com>. + * + * 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-v23.c,v 1.70 2001/10/02 09:16:02 dwmw2 Exp $ + * + * Ported to Linux 2.3.x and MTD: + * Copyright (C) 2000 Alexander Larsson (alex@cendio.se), Cendio Systems AB + * + * Copyright 2000, 2001 Red Hat, Inc. + */ + +/* inode.c -- Contains the code that is called from the VFS. */ + +/* TODO-ALEX: + * uid and gid are just 16 bit. + * jffs_file_write reads from user-space pointers without xx_from_user + * maybe other stuff do to. + */ + +#include <linux/time.h> + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/jffs.h> +#include <linux/fs.h> +#include <linux/smp_lock.h> +#include <linux/ioctl.h> +#include <linux/stat.h> +#include <linux/blkdev.h> +#include <linux/quotaops.h> +#include <linux/highmem.h> +#include <linux/vfs.h> +#include <asm/semaphore.h> +#include <asm/byteorder.h> +#include <asm/uaccess.h> + +#include "jffs_fm.h" +#include "intrep.h" +#ifdef CONFIG_JFFS_PROC_FS +#include "jffs_proc.h" +#endif + +static int jffs_remove(struct inode *dir, struct dentry *dentry, int type); + +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 address_space_operations jffs_address_operations; + +kmem_cache_t *node_cache = NULL; +kmem_cache_t *fm_cache = NULL; + +/* Called by the VFS at mount time to initialize the whole file system. */ +static int jffs_fill_super(struct super_block *sb, void *data, int silent) +{ + struct inode *root_inode; + struct jffs_control *c; + + sb->s_flags |= MS_NODIRATIME; + + D1(printk(KERN_NOTICE "JFFS: Trying to mount device %s.\n", + sb->s_id)); + + if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) { + printk(KERN_WARNING "JFFS: Trying to mount a " + "non-mtd device.\n"); + return -EINVAL; + } + + sb->s_blocksize = PAGE_CACHE_SIZE; + sb->s_blocksize_bits = PAGE_CACHE_SHIFT; + sb->s_fs_info = (void *) 0; + sb->s_maxbytes = 0xFFFFFFFF; + + /* Build the file system. */ + if (jffs_build_fs(sb) < 0) { + goto jffs_sb_err1; + } + + /* + * set up enough so that we can read an inode + */ + sb->s_magic = JFFS_MAGIC_SB_BITMASK; + sb->s_op = &jffs_ops; + + root_inode = iget(sb, JFFS_MIN_INO); + if (!root_inode) + goto jffs_sb_err2; + + /* Get the root directory of this file system. */ + if (!(sb->s_root = d_alloc_root(root_inode))) { + goto jffs_sb_err3; + } + + c = (struct jffs_control *) sb->s_fs_info; + +#ifdef CONFIG_JFFS_PROC_FS + /* Set up the jffs proc file system. */ + if (jffs_register_jffs_proc_dir(MINOR(sb->s_dev), c) < 0) { + printk(KERN_WARNING "JFFS: Failed to initialize the JFFS " + "proc file system for device %s.\n", + sb->s_id); + } +#endif + + /* Set the Garbage Collection thresholds */ + + /* GC if free space goes below 5% of the total size */ + c->gc_minfree_threshold = c->fmc->flash_size / 20; + + if (c->gc_minfree_threshold < c->fmc->sector_size) + c->gc_minfree_threshold = c->fmc->sector_size; + + /* GC if dirty space exceeds 33% of the total size. */ + c->gc_maxdirty_threshold = c->fmc->flash_size / 3; + + if (c->gc_maxdirty_threshold < c->fmc->sector_size) + c->gc_maxdirty_threshold = c->fmc->sector_size; + + + c->thread_pid = kernel_thread (jffs_garbage_collect_thread, + (void *) c, + CLONE_KERNEL); + D1(printk(KERN_NOTICE "JFFS: GC thread pid=%d.\n", (int) c->thread_pid)); + + D1(printk(KERN_NOTICE "JFFS: Successfully mounted device %s.\n", + sb->s_id)); + return 0; + +jffs_sb_err3: + iput(root_inode); +jffs_sb_err2: + jffs_cleanup_control((struct jffs_control *)sb->s_fs_info); +jffs_sb_err1: + printk(KERN_WARNING "JFFS: Failed to mount device %s.\n", + sb->s_id); + return -EINVAL; +} + + +/* This function is called when the file system is umounted. */ +static void +jffs_put_super(struct super_block *sb) +{ + struct jffs_control *c = (struct jffs_control *) sb->s_fs_info; + + D2(printk("jffs_put_super()\n")); + +#ifdef CONFIG_JFFS_PROC_FS + jffs_unregister_jffs_proc_dir(c); +#endif + + if (c->gc_task) { + D1(printk (KERN_NOTICE "jffs_put_super(): Telling gc thread to die.\n")); + send_sig(SIGKILL, c->gc_task, 1); + } + wait_for_completion(&c->gc_thread_comp); + + D1(printk (KERN_NOTICE "jffs_put_super(): Successfully waited on thread.\n")); + + jffs_cleanup_control((struct jffs_control *)sb->s_fs_info); + D1(printk(KERN_NOTICE "JFFS: Successfully unmounted device %s.\n", + sb->s_id)); +} + + +/* 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_setattr(struct dentry *dentry, struct iattr *iattr) +{ + struct inode *inode = dentry->d_inode; + struct jffs_raw_inode raw_inode; + struct jffs_control *c; + struct jffs_fmcontrol *fmc; + struct jffs_file *f; + struct jffs_node *new_node; + int update_all; + int res = 0; + int recoverable = 0; + + lock_kernel(); + + if ((res = inode_change_ok(inode, iattr))) + goto out; + + c = (struct jffs_control *)inode->i_sb->s_fs_info; + fmc = c->fmc; + + D3(printk (KERN_NOTICE "notify_change(): down biglock\n")); + down(&fmc->biglock); + + f = jffs_find_file(c, inode->i_ino); + + ASSERT(if (!f) { + printk("jffs_setattr(): Invalid inode number: %lu\n", + inode->i_ino); + D3(printk (KERN_NOTICE "notify_change(): up biglock\n")); + up(&fmc->biglock); + res = -EINVAL; + goto out; + }); + + D1(printk("***jffs_setattr(): file: \"%s\", ino: %u\n", + f->name, f->ino)); + + update_all = iattr->ia_valid & ATTR_FORCE; + + if ( (update_all || iattr->ia_valid & ATTR_SIZE) + && (iattr->ia_size + 128 < f->size) ) { + /* We're shrinking the file by more than 128 bytes. + We'll be able to GC and recover this space, so + allow it to go into the reserved space. */ + recoverable = 1; + } + + if (!(new_node = jffs_alloc_node())) { + D(printk("jffs_setattr(): Allocation failed!\n")); + D3(printk (KERN_NOTICE "notify_change(): up biglock\n")); + up(&fmc->biglock); + res = -ENOMEM; + goto out; + } + + 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.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 = f->nsize; + 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", (long)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; + inode->i_blocks = (inode->i_size + 511) >> 9; + + if (len) { + invalidate_inode_pages(inode->i_mapping); + } + inode->i_ctime = CURRENT_TIME_SEC; + inode->i_mtime = inode->i_ctime; + } + if (update_all || iattr->ia_valid & ATTR_ATIME) { + raw_inode.atime = iattr->ia_atime.tv_sec; + inode->i_atime = iattr->ia_atime; + } + if (update_all || iattr->ia_valid & ATTR_MTIME) { + raw_inode.mtime = iattr->ia_mtime.tv_sec; + inode->i_mtime = iattr->ia_mtime; + } + if (update_all || iattr->ia_valid & ATTR_CTIME) { + raw_inode.ctime = iattr->ia_ctime.tv_sec; + inode->i_ctime = iattr->ia_ctime; + } + + /* Write this node to the flash. */ + if ((res = jffs_write_node(c, new_node, &raw_inode, f->name, NULL, recoverable, f)) < 0) { + D(printk("jffs_notify_change(): The write failed!\n")); + jffs_free_node(new_node); + D3(printk (KERN_NOTICE "n_c(): up biglock\n")); + up(&c->fmc->biglock); + goto out; + } + + jffs_insert_node(c, f, &raw_inode, NULL, new_node); + + mark_inode_dirty(inode); + D3(printk (KERN_NOTICE "n_c(): up biglock\n")); + up(&c->fmc->biglock); +out: + unlock_kernel(); + return res; +} /* jffs_notify_change() */ + + +static struct inode * +jffs_new_inode(const struct inode * dir, struct jffs_raw_inode *raw_inode, + int * err) +{ + struct super_block * sb; + struct inode * inode; + struct jffs_control *c; + struct jffs_file *f; + + sb = dir->i_sb; + inode = new_inode(sb); + if (!inode) { + *err = -ENOMEM; + return NULL; + } + + c = (struct jffs_control *)sb->s_fs_info; + + inode->i_ino = raw_inode->ino; + inode->i_mode = raw_inode->mode; + inode->i_nlink = raw_inode->nlink; + inode->i_uid = raw_inode->uid; + inode->i_gid = raw_inode->gid; + inode->i_size = raw_inode->dsize; + inode->i_atime.tv_sec = raw_inode->atime; + inode->i_mtime.tv_sec = raw_inode->mtime; + inode->i_ctime.tv_sec = raw_inode->ctime; + inode->i_ctime.tv_nsec = 0; + inode->i_mtime.tv_nsec = 0; + inode->i_atime.tv_nsec = 0; + inode->i_blksize = PAGE_SIZE; + inode->i_blocks = (inode->i_size + 511) >> 9; + + f = jffs_find_file(c, raw_inode->ino); + + inode->u.generic_ip = (void *)f; + insert_inode_hash(inode); + + return inode; +} + +/* Get statistics of the file system. */ +static int +jffs_statfs(struct super_block *sb, struct kstatfs *buf) +{ + struct jffs_control *c = (struct jffs_control *) sb->s_fs_info; + struct jffs_fmcontrol *fmc; + + lock_kernel(); + + fmc = c->fmc; + + D2(printk("jffs_statfs()\n")); + + buf->f_type = JFFS_MAGIC_SB_BITMASK; + buf->f_bsize = PAGE_CACHE_SIZE; + buf->f_blocks = (fmc->flash_size / PAGE_CACHE_SIZE) + - (fmc->min_free_size / PAGE_CACHE_SIZE); + buf->f_bfree = (jffs_free_size1(fmc) + jffs_free_size2(fmc) + + fmc->dirty_size - fmc->min_free_size) + >> PAGE_CACHE_SHIFT; + buf->f_bavail = buf->f_bfree; + + /* Find out how many files there are in the filesystem. */ + buf->f_files = jffs_foreach_file(c, jffs_file_count); + buf->f_ffree = buf->f_bfree; + /* buf->f_fsid = 0; */ + buf->f_namelen = JFFS_MAX_NAME_LEN; + + unlock_kernel(); + + return 0; +} + + +/* Rename a file. */ +static int +jffs_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry) +{ + 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")); + + D(printk("jffs_rename(): old_dir: 0x%p, old name: 0x%p, " + "new_dir: 0x%p, new name: 0x%p\n", + old_dir, old_dentry->d_name.name, + new_dir, new_dentry->d_name.name)); + + lock_kernel(); + c = (struct jffs_control *)old_dir->i_sb->s_fs_info; + ASSERT(if (!c) { + printk(KERN_ERR "jffs_rename(): The old_dir inode " + "didn't have a reference to a jffs_file struct\n"); + unlock_kernel(); + return -EIO; + }); + + result = -ENOTDIR; + if (!(old_dir_f = (struct jffs_file *)old_dir->u.generic_ip)) { + D(printk("jffs_rename(): Old dir invalid.\n")); + goto jffs_rename_end; + } + + /* Try to find the file to move. */ + result = -ENOENT; + if (!(f = jffs_find_child(old_dir_f, old_dentry->d_name.name, + old_dentry->d_name.len))) { + goto jffs_rename_end; + } + + /* Find the new directory. */ + result = -ENOTDIR; + if (!(new_dir_f = (struct jffs_file *)new_dir->u.generic_ip)) { + D(printk("jffs_rename(): New dir invalid.\n")); + goto jffs_rename_end; + } + D3(printk (KERN_NOTICE "rename(): down biglock\n")); + down(&c->fmc->biglock); + /* Create a node and initialize as much as needed. */ + result = -ENOMEM; + 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; +} + + +extern int generic_file_open(struct inode *, struct file *) __attribute__((weak)); +extern loff_t generic_file_llseek(struct file *, loff_t, int) __attribute__((weak)); + +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)); + + 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"); |
