Release 4.11 fs/jffs2/super.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/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 = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
	if (!f)
		return NULL;
	return &f->vfs_inode;
}

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David Woodhouse
31
75.61%
2
50.00%
Linus Torvalds
9
21.95%
1
25.00%
Christoph Lameter
1
2.44%
1
25.00%
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41
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4
100.00%



static void jffs2_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
}

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Nicholas Piggin
18
50.00%
1
33.33%
David Woodhouse
12
33.33%
1
33.33%
Linus Torvalds
6
16.67%
1
33.33%
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36
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3
100.00%



static void jffs2_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, jffs2_i_callback);
}

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static void jffs2_i_init_once(void *foo)
{
	struct jffs2_inode_info *f = foo;

	mutex_init(&f->sem);
	inode_init_once(&f->vfs_inode);
}

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David Woodhouse
28
84.85%
3
60.00%
Christoph Lameter
3
9.09%
1
20.00%
Linus Torvalds
2
6.06%
1
20.00%
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33
100.00%
5
100.00%



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 "";
	}
}

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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->rp_size)
		seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);

	return 0;
}

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Andres Salomon
57
71.25%
1
33.33%
Daniel Drake
19
23.75%
1
33.33%
Al Viro
4
5.00%
1
33.33%
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80
100.00%
3
100.00%



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
	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;
}

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David Woodhouse
48
78.69%
2
66.67%
Artem B. Bityutskiy
13
21.31%
1
33.33%
Total
61
100.00%
3
100.00%



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);
}

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David Woodhouse
28
100.00%
1
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28
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1
100.00%



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);
}

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David Woodhouse
38
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38
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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);
}

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David Woodhouse
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38
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1
100.00%



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));
}

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David Woodhouse
68
91.89%
1
25.00%
David Howells
5
6.76%
2
50.00%
Al Viro
1
1.35%
1
25.00%
Total
74
100.00%
4
100.00%


static const struct export_operations jffs2_export_ops = {
	.get_parent = jffs2_get_parent,
	.fh_to_dentry = jffs2_fh_to_dentry,
	.fh_to_parent = jffs2_fh_to_parent,
};

/*
 * JFFS2 mount options.
 *
 * Opt_override_compr: override default compressor
 * Opt_rp_size: size of reserved pool in KiB
 * Opt_err: just end of array marker
 */
enum {
	
Opt_override_compr,
	
Opt_rp_size,
	
Opt_err,
};


static const match_table_t tokens = {
	{Opt_override_compr, "compr=%s"},
	{Opt_rp_size, "rp_size=%u"},
	{Opt_err, NULL},
};



static int jffs2_parse_options(struct jffs2_sb_info *c, char *data)
{
	substring_t args[MAX_OPT_ARGS];
	char *p, *name;
	unsigned int opt;

	if (!data)
		return 0;

	while ((p = strsep(&data, ","))) {
		int token;

		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_override_compr:
			name = match_strdup(&args[0]);

			if (!name)
				return -ENOMEM;
			if (!strcmp(name, "none"))
				c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
#ifdef CONFIG_JFFS2_LZO
			else if (!strcmp(name, "lzo"))
				c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO;
#endif
#ifdef CONFIG_JFFS2_ZLIB
			else if (!strcmp(name, "zlib"))
				c->mount_opts.compr =
						JFFS2_COMPR_MODE_FORCEZLIB;
#endif
			else {
				pr_err("Error: unknown compressor \"%s\"\n",
				       name);
				kfree(name);
				return -EINVAL;
			}
			kfree(name);
			c->mount_opts.override_compr = true;
			break;
		case Opt_rp_size:
			if (match_int(&args[0], &opt))
				return -EINVAL;
			opt *= 1024;
			if (opt > c->mtd->size) {
				pr_warn("Too large reserve pool specified, max "
					"is %llu KB\n", c->mtd->size / 1024);
				return -EINVAL;
			}
			c->mount_opts.rp_size = opt;
			break;
		default:
			pr_err("Error: unrecognized mount option '%s' or missing value\n",
			       p);
			return -EINVAL;
		}
	}

	return 0;
}

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Andres Salomon
212
74.65%
2
40.00%
Daniel Drake
68
23.94%
1
20.00%
Joe Perches
4
1.41%
2
40.00%
Total
284
100.00%
5
100.00%



static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	int err;

	sync_filesystem(sb);
	err = jffs2_parse_options(c, data);
	if (err)
		return -EINVAL;

	return jffs2_do_remount_fs(sb, flags, data);
}

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Andres Salomon
59
92.19%
1
50.00%
Theodore Y. Ts'o
5
7.81%
1
50.00%
Total
64
100.00%
2
100.00%


static const struct super_operations jffs2_super_operations =
{
	.alloc_inode =	jffs2_alloc_inode,
	.destroy_inode =jffs2_destroy_inode,
	.put_super =	jffs2_put_super,
	.statfs =	jffs2_statfs,
	.remount_fs =	jffs2_remount_fs,
	.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, void *data, int silent)
{
	struct jffs2_sb_info *c;
	int ret;

	jffs2_dbg(1, "jffs2_get_sb_mtd():"
		  " New superblock for device %d (\"%s\")\n",
		  sb->s_mtd->index, sb->s_mtd->name);

	c = kzalloc(sizeof(*c), GFP_KERNEL);
	if (!c)
		return -ENOMEM;

	c->mtd = sb->s_mtd;
	c->os_priv = sb;
	sb->s_fs_info = c;

	ret = jffs2_parse_options(c, data);
	if (ret) {
		kfree(c);
		return -EINVAL;
	}

	/* 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 | MS_NOATIME;
	sb->s_xattr = jffs2_xattr_handlers;
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
	sb->s_flags |= MS_POSIXACL;
#endif
	ret = jffs2_do_fill_super(sb, data, silent);
	return ret;
}

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David Howells
134
62.04%
2
22.22%
David Woodhouse
37
17.13%
3
33.33%
Andres Salomon
24
11.11%
1
11.11%
Al Viro
10
4.63%
1
11.11%
Jan Blunck
8
3.70%
1
11.11%
Joe Perches
3
1.39%
1
11.11%
Total
216
100.00%
9
100.00%



static struct dentry *jffs2_mount(struct file_system_type *fs_type,
			int flags, const char *dev_name,
			void *data)
{
	return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super);
}

Contributors
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David Howells
21
53.85%
1
16.67%
Al Viro
13
33.33%
3
50.00%
David Woodhouse
4
10.26%
1
16.67%
Linus Torvalds
1
2.56%
1
16.67%
Total
39
100.00%
6
100.00%



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__);
}

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David Woodhouse
78
73.58%
5
45.45%
Joe Perches
12
11.32%
1
9.09%
KaiGai Kohei
5
4.72%
1
9.09%
Ferenc Havasi
5
4.72%
1
9.09%
Al Viro
4
3.77%
1
9.09%
Artem B. Bityutskiy
1
0.94%
1
9.09%
Tetsuo Handa
1
0.94%
1
9.09%
Total
106
100.00%
11
100.00%



static void jffs2_kill_sb(struct super_block *sb)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	if (!(sb->s_flags & MS_RDONLY))
		jffs2_stop_garbage_collect_thread(c);
	kill_mtd_super(sb);
	kfree(c);
}

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Al Viro
24
51.06%
1
25.00%
Artem B. Bityutskiy
16
34.04%
1
25.00%
David Woodhouse
6
12.77%
1
25.00%
David Howells
1
2.13%
1
25.00%
Total
47
100.00%
4
100.00%


static struct file_system_type jffs2_fs_type = {
	.owner =	THIS_MODULE,
	.name =		"jffs2",
	.mount =	jffs2_mount,
	.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_MEM_SPREAD|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;
}

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David Woodhouse
101
50.75%
7
38.89%
Linus Torvalds
65
32.66%
1
5.56%
Joe Perches
10
5.03%
2
11.11%
Ferenc Havasi
6
3.02%
1
5.56%
Todd Android Poynor
5
2.51%
1
5.56%
Paul Jackson
4
2.01%
2
11.11%
Alexey Dobriyan
4
2.01%
1
5.56%
Vladimir Davydov
2
1.01%
1
5.56%
Andrew Victor
1
0.50%
1
5.56%
Andrew Morton
1
0.50%
1
5.56%
Total
199
100.00%
18
100.00%



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);
}

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CommitProp
Linus Torvalds
15
50.00%
1
20.00%
David Woodhouse
11
36.67%
3
60.00%
Kirill A. Shutemov
4
13.33%
1
20.00%
Total
30
100.00%
5
100.00%


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.
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
597
34.33%
13
21.67%
Andres Salomon
445
25.59%
2
3.33%
Linus Torvalds
184
10.58%
3
5.00%
David Howells
163
9.37%
4
6.67%
Daniel Drake
96
5.52%
1
1.67%
Al Viro
79
4.54%
9
15.00%
Nicholas Piggin
39
2.24%
1
1.67%
Joe Perches
36
2.07%
3
5.00%
Artem B. Bityutskiy
33
1.90%
4
6.67%
Ferenc Havasi
11
0.63%
1
1.67%
Jan Blunck
8
0.46%
1
1.67%
Christoph Lameter
6
0.35%
3
5.00%
Eric W. Biedermann
5
0.29%
1
1.67%
Alexey Dobriyan
5
0.29%
2
3.33%
Theodore Y. Ts'o
5
0.29%
1
1.67%
Todd Android Poynor
5
0.29%
1
1.67%
KaiGai Kohei
5
0.29%
1
1.67%
Kirill A. Shutemov
4
0.23%
1
1.67%
Paul Jackson
4
0.23%
2
3.33%
Arnaldo Carvalho de Melo
3
0.17%
1
1.67%
Vladimir Davydov
2
0.12%
1
1.67%
Andrew Victor
1
0.06%
1
1.67%
Andrew Morton
1
0.06%
1
1.67%
Tetsuo Handa
1
0.06%
1
1.67%
Josef 'Jeff' Sipek
1
0.06%
1
1.67%
Total
1739
100.00%
60
100.00%
Directory: fs/jffs2

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