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// SPDX-License-Identifier: GPL-2.0-only
/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright © 2001-2007 Red Hat, Inc.
*
* Created by David Woodhouse <dwmw2@infradead.org>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <common.h>
#include <init.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <fs.h>
#include <linux/err.h>
#include <linux/mount.h>
#include <linux/jffs2.h>
#include <linux/pagemap.h>
#include <linux/mtd/mtd.h>
#include <linux/ctype.h>
#include <linux/namei.h>
#include "compr.h"
#include "nodelist.h"
static struct kmem_cache *jffs2_inode_cachep;
/* from include/linux/fs.h */
static inline void i_uid_write(struct inode *inode, uid_t uid)
{
inode->i_uid = uid;
}
static inline void i_gid_write(struct inode *inode, gid_t gid)
{
inode->i_gid = gid;
}
static struct inode *jffs2_alloc_inode(struct super_block *sb)
{
struct jffs2_inode_info *f;
f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
if (!f)
return NULL;
return &f->vfs_inode;
}
static void jffs2_destroy_inode(struct inode *inode)
{
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
kfree(f->target);
kmem_cache_free(jffs2_inode_cachep, f);
}
static void jffs2_i_init_once(void *foo)
{
}
static const struct super_operations jffs2_super_operations =
{
.alloc_inode = jffs2_alloc_inode,
.destroy_inode = jffs2_destroy_inode,
};
/*
* fill in the superblock
*/
int jffs2_fill_super(struct fs_device *fsdev, int silent)
{
struct super_block *sb = &fsdev->sb;
struct jffs2_sb_info *c = sb->s_fs_info;
c->os_priv = sb;
/* Initialize JFFS2 superblock locks, the further initialization will
* be done later */
mutex_init(&c->alloc_sem);
mutex_init(&c->erase_free_sem);
init_waitqueue_head(&c->erase_wait);
init_waitqueue_head(&c->inocache_wq);
spin_lock_init(&c->erase_completion_lock);
spin_lock_init(&c->inocache_lock);
sb->s_op = &jffs2_super_operations;
sb->s_flags = sb->s_flags | SB_NOATIME;
sb->s_xattr = jffs2_xattr_handlers;
return jffs2_do_fill_super(sb, silent);
}
static int __init init_jffs2_fs(void)
{
/* Paranoia checks for on-medium structures. If we ask GCC
to pack them with __attribute__((packed)) then it _also_
assumes that they're not aligned -- so it emits crappy
code on some architectures. Ideally we want an attribute
which means just 'no padding', without the alignment
thing. But GCC doesn't have that -- we have to just
hope the structs are the right sizes, instead. */
BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
pr_info("JFFS version 2.2."
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
" (NAND)"
#endif
#ifdef CONFIG_JFFS2_SUMMARY
" (SUMMARY) "
#endif
" © 2001-2006 Red Hat, Inc.\n");
jffs2_inode_cachep = kmem_cache_create("jffs2_i",
sizeof(struct jffs2_inode_info),
0, (SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD|SLAB_ACCOUNT),
jffs2_i_init_once);
if (!jffs2_inode_cachep) {
pr_err("error: Failed to initialise inode cache\n");
return -ENOMEM;
}
return 0;
}
late_initcall(init_jffs2_fs);
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