443 lines
11 KiB
C
443 lines
11 KiB
C
/*
|
|
* JFFS2 -- Journalling Flash File System, Version 2.
|
|
*
|
|
* Copyright © 2001-2007 Red Hat, Inc.
|
|
*
|
|
* Created by David Woodhouse <dwmw2@infradead.org>
|
|
*
|
|
* For licensing information, see the file 'LICENCE' in this directory.
|
|
*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/list.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/fs_context.h>
|
|
#include <linux/fs_parser.h>
|
|
#include <linux/jffs2.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/mtd/super.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/exportfs.h>
|
|
#include "compr.h"
|
|
#include "nodelist.h"
|
|
|
|
static void jffs2_put_super(struct super_block *);
|
|
|
|
static struct kmem_cache *jffs2_inode_cachep;
|
|
|
|
static struct inode *jffs2_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct jffs2_inode_info *f;
|
|
|
|
f = alloc_inode_sb(sb, jffs2_inode_cachep, GFP_KERNEL);
|
|
if (!f)
|
|
return NULL;
|
|
return &f->vfs_inode;
|
|
}
|
|
|
|
static void jffs2_free_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)
|
|
{
|
|
struct jffs2_inode_info *f = foo;
|
|
|
|
mutex_init(&f->sem);
|
|
inode_init_once(&f->vfs_inode);
|
|
}
|
|
|
|
static const char *jffs2_compr_name(unsigned int compr)
|
|
{
|
|
switch (compr) {
|
|
case JFFS2_COMPR_MODE_NONE:
|
|
return "none";
|
|
#ifdef CONFIG_JFFS2_LZO
|
|
case JFFS2_COMPR_MODE_FORCELZO:
|
|
return "lzo";
|
|
#endif
|
|
#ifdef CONFIG_JFFS2_ZLIB
|
|
case JFFS2_COMPR_MODE_FORCEZLIB:
|
|
return "zlib";
|
|
#endif
|
|
default:
|
|
/* should never happen; programmer error */
|
|
WARN_ON(1);
|
|
return "";
|
|
}
|
|
}
|
|
|
|
static int jffs2_show_options(struct seq_file *s, struct dentry *root)
|
|
{
|
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb);
|
|
struct jffs2_mount_opts *opts = &c->mount_opts;
|
|
|
|
if (opts->override_compr)
|
|
seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
|
|
if (opts->set_rp_size)
|
|
seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int jffs2_sync_fs(struct super_block *sb, int wait)
|
|
{
|
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
|
|
|
|
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
|
|
if (jffs2_is_writebuffered(c))
|
|
cancel_delayed_work_sync(&c->wbuf_dwork);
|
|
#endif
|
|
|
|
mutex_lock(&c->alloc_sem);
|
|
jffs2_flush_wbuf_pad(c);
|
|
mutex_unlock(&c->alloc_sem);
|
|
return 0;
|
|
}
|
|
|
|
static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
|
|
uint32_t generation)
|
|
{
|
|
/* We don't care about i_generation. We'll destroy the flash
|
|
before we start re-using inode numbers anyway. And even
|
|
if that wasn't true, we'd have other problems...*/
|
|
return jffs2_iget(sb, ino);
|
|
}
|
|
|
|
static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
|
|
jffs2_nfs_get_inode);
|
|
}
|
|
|
|
static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
|
|
jffs2_nfs_get_inode);
|
|
}
|
|
|
|
static struct dentry *jffs2_get_parent(struct dentry *child)
|
|
{
|
|
struct jffs2_inode_info *f;
|
|
uint32_t pino;
|
|
|
|
BUG_ON(!d_is_dir(child));
|
|
|
|
f = JFFS2_INODE_INFO(d_inode(child));
|
|
|
|
pino = f->inocache->pino_nlink;
|
|
|
|
JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
|
|
f->inocache->ino, pino);
|
|
|
|
return d_obtain_alias(jffs2_iget(child->d_sb, pino));
|
|
}
|
|
|
|
static const struct export_operations jffs2_export_ops = {
|
|
.encode_fh = generic_encode_ino32_fh,
|
|
.get_parent = jffs2_get_parent,
|
|
.fh_to_dentry = jffs2_fh_to_dentry,
|
|
.fh_to_parent = jffs2_fh_to_parent,
|
|
};
|
|
|
|
/*
|
|
* JFFS2 mount options.
|
|
*
|
|
* Opt_source: The source device
|
|
* Opt_override_compr: override default compressor
|
|
* Opt_rp_size: size of reserved pool in KiB
|
|
*/
|
|
enum {
|
|
Opt_override_compr,
|
|
Opt_rp_size,
|
|
};
|
|
|
|
static const struct constant_table jffs2_param_compr[] = {
|
|
{"none", JFFS2_COMPR_MODE_NONE },
|
|
#ifdef CONFIG_JFFS2_LZO
|
|
{"lzo", JFFS2_COMPR_MODE_FORCELZO },
|
|
#endif
|
|
#ifdef CONFIG_JFFS2_ZLIB
|
|
{"zlib", JFFS2_COMPR_MODE_FORCEZLIB },
|
|
#endif
|
|
{}
|
|
};
|
|
|
|
static const struct fs_parameter_spec jffs2_fs_parameters[] = {
|
|
fsparam_enum ("compr", Opt_override_compr, jffs2_param_compr),
|
|
fsparam_u32 ("rp_size", Opt_rp_size),
|
|
{}
|
|
};
|
|
|
|
static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
|
|
{
|
|
struct fs_parse_result result;
|
|
struct jffs2_sb_info *c = fc->s_fs_info;
|
|
int opt;
|
|
|
|
opt = fs_parse(fc, jffs2_fs_parameters, param, &result);
|
|
if (opt < 0)
|
|
return opt;
|
|
|
|
switch (opt) {
|
|
case Opt_override_compr:
|
|
c->mount_opts.compr = result.uint_32;
|
|
c->mount_opts.override_compr = true;
|
|
break;
|
|
case Opt_rp_size:
|
|
if (result.uint_32 > UINT_MAX / 1024)
|
|
return invalf(fc, "jffs2: rp_size unrepresentable");
|
|
c->mount_opts.rp_size = result.uint_32 * 1024;
|
|
c->mount_opts.set_rp_size = true;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void jffs2_update_mount_opts(struct fs_context *fc)
|
|
{
|
|
struct jffs2_sb_info *new_c = fc->s_fs_info;
|
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(fc->root->d_sb);
|
|
|
|
mutex_lock(&c->alloc_sem);
|
|
if (new_c->mount_opts.override_compr) {
|
|
c->mount_opts.override_compr = new_c->mount_opts.override_compr;
|
|
c->mount_opts.compr = new_c->mount_opts.compr;
|
|
}
|
|
if (new_c->mount_opts.set_rp_size) {
|
|
c->mount_opts.set_rp_size = new_c->mount_opts.set_rp_size;
|
|
c->mount_opts.rp_size = new_c->mount_opts.rp_size;
|
|
}
|
|
mutex_unlock(&c->alloc_sem);
|
|
}
|
|
|
|
static int jffs2_reconfigure(struct fs_context *fc)
|
|
{
|
|
struct super_block *sb = fc->root->d_sb;
|
|
|
|
sync_filesystem(sb);
|
|
jffs2_update_mount_opts(fc);
|
|
|
|
return jffs2_do_remount_fs(sb, fc);
|
|
}
|
|
|
|
static const struct super_operations jffs2_super_operations =
|
|
{
|
|
.alloc_inode = jffs2_alloc_inode,
|
|
.free_inode = jffs2_free_inode,
|
|
.put_super = jffs2_put_super,
|
|
.statfs = jffs2_statfs,
|
|
.evict_inode = jffs2_evict_inode,
|
|
.dirty_inode = jffs2_dirty_inode,
|
|
.show_options = jffs2_show_options,
|
|
.sync_fs = jffs2_sync_fs,
|
|
};
|
|
|
|
/*
|
|
* fill in the superblock
|
|
*/
|
|
static int jffs2_fill_super(struct super_block *sb, struct fs_context *fc)
|
|
{
|
|
struct jffs2_sb_info *c = sb->s_fs_info;
|
|
|
|
jffs2_dbg(1, "jffs2_get_sb_mtd():"
|
|
" New superblock for device %d (\"%s\")\n",
|
|
sb->s_mtd->index, sb->s_mtd->name);
|
|
|
|
c->mtd = sb->s_mtd;
|
|
c->os_priv = sb;
|
|
|
|
if (c->mount_opts.rp_size > c->mtd->size)
|
|
return invalf(fc, "jffs2: Too large reserve pool specified, max is %llu KB",
|
|
c->mtd->size / 1024);
|
|
|
|
/* 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_export_op = &jffs2_export_ops;
|
|
sb->s_flags = sb->s_flags | SB_NOATIME;
|
|
sb->s_xattr = jffs2_xattr_handlers;
|
|
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
|
|
sb->s_flags |= SB_POSIXACL;
|
|
#endif
|
|
return jffs2_do_fill_super(sb, fc);
|
|
}
|
|
|
|
static int jffs2_get_tree(struct fs_context *fc)
|
|
{
|
|
return get_tree_mtd(fc, jffs2_fill_super);
|
|
}
|
|
|
|
static void jffs2_free_fc(struct fs_context *fc)
|
|
{
|
|
kfree(fc->s_fs_info);
|
|
}
|
|
|
|
static const struct fs_context_operations jffs2_context_ops = {
|
|
.free = jffs2_free_fc,
|
|
.parse_param = jffs2_parse_param,
|
|
.get_tree = jffs2_get_tree,
|
|
.reconfigure = jffs2_reconfigure,
|
|
};
|
|
|
|
static int jffs2_init_fs_context(struct fs_context *fc)
|
|
{
|
|
struct jffs2_sb_info *ctx;
|
|
|
|
ctx = kzalloc(sizeof(struct jffs2_sb_info), GFP_KERNEL);
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
|
|
fc->s_fs_info = ctx;
|
|
fc->ops = &jffs2_context_ops;
|
|
return 0;
|
|
}
|
|
|
|
static void jffs2_put_super (struct super_block *sb)
|
|
{
|
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
|
|
|
|
jffs2_dbg(2, "%s()\n", __func__);
|
|
|
|
mutex_lock(&c->alloc_sem);
|
|
jffs2_flush_wbuf_pad(c);
|
|
mutex_unlock(&c->alloc_sem);
|
|
|
|
jffs2_sum_exit(c);
|
|
|
|
jffs2_free_ino_caches(c);
|
|
jffs2_free_raw_node_refs(c);
|
|
kvfree(c->blocks);
|
|
jffs2_flash_cleanup(c);
|
|
kfree(c->inocache_list);
|
|
jffs2_clear_xattr_subsystem(c);
|
|
mtd_sync(c->mtd);
|
|
jffs2_dbg(1, "%s(): returning\n", __func__);
|
|
}
|
|
|
|
static void jffs2_kill_sb(struct super_block *sb)
|
|
{
|
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
|
|
if (c && !sb_rdonly(sb))
|
|
jffs2_stop_garbage_collect_thread(c);
|
|
kill_mtd_super(sb);
|
|
kfree(c);
|
|
}
|
|
|
|
static struct file_system_type jffs2_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "jffs2",
|
|
.init_fs_context = jffs2_init_fs_context,
|
|
.parameters = jffs2_fs_parameters,
|
|
.kill_sb = jffs2_kill_sb,
|
|
};
|
|
MODULE_ALIAS_FS("jffs2");
|
|
|
|
static int __init init_jffs2_fs(void)
|
|
{
|
|
int ret;
|
|
|
|
/* 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("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_ACCOUNT),
|
|
jffs2_i_init_once);
|
|
if (!jffs2_inode_cachep) {
|
|
pr_err("error: Failed to initialise inode cache\n");
|
|
return -ENOMEM;
|
|
}
|
|
ret = jffs2_compressors_init();
|
|
if (ret) {
|
|
pr_err("error: Failed to initialise compressors\n");
|
|
goto out;
|
|
}
|
|
ret = jffs2_create_slab_caches();
|
|
if (ret) {
|
|
pr_err("error: Failed to initialise slab caches\n");
|
|
goto out_compressors;
|
|
}
|
|
ret = register_filesystem(&jffs2_fs_type);
|
|
if (ret) {
|
|
pr_err("error: Failed to register filesystem\n");
|
|
goto out_slab;
|
|
}
|
|
return 0;
|
|
|
|
out_slab:
|
|
jffs2_destroy_slab_caches();
|
|
out_compressors:
|
|
jffs2_compressors_exit();
|
|
out:
|
|
kmem_cache_destroy(jffs2_inode_cachep);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit exit_jffs2_fs(void)
|
|
{
|
|
unregister_filesystem(&jffs2_fs_type);
|
|
jffs2_destroy_slab_caches();
|
|
jffs2_compressors_exit();
|
|
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy cache.
|
|
*/
|
|
rcu_barrier();
|
|
kmem_cache_destroy(jffs2_inode_cachep);
|
|
}
|
|
|
|
module_init(init_jffs2_fs);
|
|
module_exit(exit_jffs2_fs);
|
|
|
|
MODULE_DESCRIPTION("The Journalling Flash File System, v2");
|
|
MODULE_AUTHOR("Red Hat, Inc.");
|
|
MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
|
|
// the sake of this tag. It's Free Software.
|