fs/efs/super.c - kernel/msm-4.9 - Gitiles

 /*
  * super.c
  *
  * Copyright (c) 1999 Al Smith
  *
  * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/exportfs.h>
 #include <linux/slab.h>
 #include <linux/buffer_head.h>
 #include <linux/vfs.h>

 #include "efs.h"
 #include <linux/efs_vh.h>
 #include <linux/efs_fs_sb.h>

 static int efs_statfs(struct dentry *dentry, struct kstatfs *buf);
 static int efs_fill_super(struct super_block *s, void *d, int silent);

 static struct dentry *efs_mount(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *data)
 {
 	return mount_bdev(fs_type, flags, dev_name, data, efs_fill_super);
 }

 static struct file_system_type efs_fs_type = {
 	.owner		= THIS_MODULE,
 	.name		= "efs",
 	.mount		= efs_mount,
 	.kill_sb	= kill_block_super,
 	.fs_flags	= FS_REQUIRES_DEV,
 };

 static struct pt_types sgi_pt_types[] = {
 	{0x00,		"SGI vh"},
 	{0x01,		"SGI trkrepl"},
 	{0x02,		"SGI secrepl"},
 	{0x03,		"SGI raw"},
 	{0x04,		"SGI bsd"},
 	{SGI_SYSV,	"SGI sysv"},
 	{0x06,		"SGI vol"},
 	{SGI_EFS,	"SGI efs"},
 	{0x08,		"SGI lv"},
 	{0x09,		"SGI rlv"},
 	{0x0A,		"SGI xfs"},
 	{0x0B,		"SGI xfslog"},
 	{0x0C,		"SGI xlv"},
 	{0x82,		"Linux swap"},
 	{0x83,		"Linux native"},
 	{0,		NULL}
 };


 static struct kmem_cache * efs_inode_cachep;

 static struct inode *efs_alloc_inode(struct super_block *sb)
 {
 	struct efs_inode_info *ei;
 	ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL);
 	if (!ei)
 		return NULL;
 	return &ei->vfs_inode;
 }

 static void efs_i_callback(struct rcu_head *head)
 {
 	struct inode *inode = container_of(head, struct inode, i_rcu);
 	kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
 }

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

 static void init_once(void *foo)
 {
 	struct efs_inode_info *ei = (struct efs_inode_info *) foo;

 	inode_init_once(&ei->vfs_inode);
 }

 static int init_inodecache(void)
 {
 	efs_inode_cachep = kmem_cache_create("efs_inode_cache",
 				sizeof(struct efs_inode_info),
 				0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 				init_once);
 	if (efs_inode_cachep == NULL)
 		return -ENOMEM;
 	return 0;
 }

 static void destroy_inodecache(void)
 {
 	kmem_cache_destroy(efs_inode_cachep);
 }

 static void efs_put_super(struct super_block *s)
 {
 	kfree(s->s_fs_info);
 	s->s_fs_info = NULL;
 }

 static int efs_remount(struct super_block *sb, int *flags, char *data)
 {
 	*flags |= MS_RDONLY;
 	return 0;
 }

 static const struct super_operations efs_superblock_operations = {
 	.alloc_inode	= efs_alloc_inode,
 	.destroy_inode	= efs_destroy_inode,
 	.put_super	= efs_put_super,
 	.statfs		= efs_statfs,
 	.remount_fs	= efs_remount,
 };

 static const struct export_operations efs_export_ops = {
 	.fh_to_dentry	= efs_fh_to_dentry,
 	.fh_to_parent	= efs_fh_to_parent,
 	.get_parent	= efs_get_parent,
 };

 static int __init init_efs_fs(void) {
 	int err;
 	printk("EFS: "EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
 	err = init_inodecache();
 	if (err)
 		goto out1;
 	err = register_filesystem(&efs_fs_type);
 	if (err)
 		goto out;
 	return 0;
 out:
 	destroy_inodecache();
 out1:
 	return err;
 }

 static void __exit exit_efs_fs(void) {
 	unregister_filesystem(&efs_fs_type);
 	destroy_inodecache();
 }

 module_init(init_efs_fs)
 module_exit(exit_efs_fs)

 static efs_block_t efs_validate_vh(struct volume_header *vh) {
 	int		i;
 	__be32		cs, *ui;
 	int		csum;
 	efs_block_t	sblock = 0; /* shuts up gcc */
 	struct pt_types	*pt_entry;
 	int		pt_type, slice = -1;

 	if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
 		/*
 		 * assume that we're dealing with a partition and allow
 		 * read_super() to try and detect a valid superblock
 		 * on the next block.
 		 */
 		return 0;
 	}

 	ui = ((__be32 *) (vh + 1)) - 1;
 	for(csum = 0; ui >= ((__be32 *) vh);) {
 		cs = *ui--;
 		csum += be32_to_cpu(cs);
 	}
 	if (csum) {
 		printk(KERN_INFO "EFS: SGI disklabel: checksum bad, label corrupted\n");
 		return 0;
 	}

 #ifdef DEBUG
 	printk(KERN_DEBUG "EFS: bf: \"%16s\"\n", vh->vh_bootfile);

 	for(i = 0; i < NVDIR; i++) {
 		int	j;
 		char	name[VDNAMESIZE+1];

 		for(j = 0; j < VDNAMESIZE; j++) {
 			name[j] = vh->vh_vd[i].vd_name[j];
 		}
 		name[j] = (char) 0;

 		if (name[0]) {
 			printk(KERN_DEBUG "EFS: vh: %8s block: 0x%08x size: 0x%08x\n",
 				name,
 				(int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
 				(int) be32_to_cpu(vh->vh_vd[i].vd_nbytes));
 		}
 	}
 #endif

 	for(i = 0; i < NPARTAB; i++) {
 		pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type);
 		for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) {
 			if (pt_type == pt_entry->pt_type) break;
 		}
 #ifdef DEBUG
 		if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) {
 			printk(KERN_DEBUG "EFS: pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
 				i,
 				(int) be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
 				(int) be32_to_cpu(vh->vh_pt[i].pt_nblks),
 				pt_type,
 				(pt_entry->pt_name) ? pt_entry->pt_name : "unknown");
 		}
 #endif
 		if (IS_EFS(pt_type)) {
 			sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
 			slice = i;
 		}
 	}

 	if (slice == -1) {
 		printk(KERN_NOTICE "EFS: partition table contained no EFS partitions\n");
 #ifdef DEBUG
 	} else {
 		printk(KERN_INFO "EFS: using slice %d (type %s, offset 0x%x)\n",
 			slice,
 			(pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
 			sblock);
 #endif
 	}
 	return sblock;
 }

 static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) {

 	if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic)))
 		return -1;

 	sb->fs_magic     = be32_to_cpu(super->fs_magic);
 	sb->total_blocks = be32_to_cpu(super->fs_size);
 	sb->first_block  = be32_to_cpu(super->fs_firstcg);
 	sb->group_size   = be32_to_cpu(super->fs_cgfsize);
 	sb->data_free    = be32_to_cpu(super->fs_tfree);
 	sb->inode_free   = be32_to_cpu(super->fs_tinode);
 	sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
 	sb->total_groups = be16_to_cpu(super->fs_ncg);

 	return 0;
 }

 static int efs_fill_super(struct super_block *s, void *d, int silent)
 {
 	struct efs_sb_info *sb;
 	struct buffer_head *bh;
 	struct inode *root;
 	int ret = -EINVAL;

  	sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
 	if (!sb)
 		return -ENOMEM;
 	s->s_fs_info = sb;

 	s->s_magic		= EFS_SUPER_MAGIC;
 	if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
 		printk(KERN_ERR "EFS: device does not support %d byte blocks\n",
 			EFS_BLOCKSIZE);
 		goto out_no_fs_ul;
 	}

 	/* read the vh (volume header) block */
 	bh = sb_bread(s, 0);

 	if (!bh) {
 		printk(KERN_ERR "EFS: cannot read volume header\n");
 		goto out_no_fs_ul;
 	}

 	/*
 	 * if this returns zero then we didn't find any partition table.
 	 * this isn't (yet) an error - just assume for the moment that
 	 * the device is valid and go on to search for a superblock.
 	 */
 	sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
 	brelse(bh);

 	if (sb->fs_start == -1) {
 		goto out_no_fs_ul;
 	}

 	bh = sb_bread(s, sb->fs_start + EFS_SUPER);
 	if (!bh) {
 		printk(KERN_ERR "EFS: cannot read superblock\n");
 		goto out_no_fs_ul;
 	}

 	if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
 #ifdef DEBUG
 		printk(KERN_WARNING "EFS: invalid superblock at block %u\n", sb->fs_start + EFS_SUPER);
 #endif
 		brelse(bh);
 		goto out_no_fs_ul;
 	}
 	brelse(bh);

 	if (!(s->s_flags & MS_RDONLY)) {
 #ifdef DEBUG
 		printk(KERN_INFO "EFS: forcing read-only mode\n");
 #endif
 		s->s_flags |= MS_RDONLY;
 	}
 	s->s_op   = &efs_superblock_operations;
 	s->s_export_op = &efs_export_ops;
 	root = efs_iget(s, EFS_ROOTINODE);
 	if (IS_ERR(root)) {
 		printk(KERN_ERR "EFS: get root inode failed\n");
 		ret = PTR_ERR(root);
 		goto out_no_fs;
 	}

 	s->s_root = d_alloc_root(root);
 	if (!(s->s_root)) {
 		printk(KERN_ERR "EFS: get root dentry failed\n");
 		iput(root);
 		ret = -ENOMEM;
 		goto out_no_fs;
 	}

 	return 0;

 out_no_fs_ul:
 out_no_fs:
 	s->s_fs_info = NULL;
 	kfree(sb);
 	return ret;
 }

 static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) {
 	struct super_block *sb = dentry->d_sb;
 	struct efs_sb_info *sbi = SUPER_INFO(sb);
 	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

 	buf->f_type    = EFS_SUPER_MAGIC;	/* efs magic number */
 	buf->f_bsize   = EFS_BLOCKSIZE;		/* blocksize */
 	buf->f_blocks  = sbi->total_groups *	/* total data blocks */
 			(sbi->group_size - sbi->inode_blocks);
 	buf->f_bfree   = sbi->data_free;	/* free data blocks */
 	buf->f_bavail  = sbi->data_free;	/* free blocks for non-root */
 	buf->f_files   = sbi->total_groups *	/* total inodes */
 			sbi->inode_blocks *
 			(EFS_BLOCKSIZE / sizeof(struct efs_dinode));
 	buf->f_ffree   = sbi->inode_free;	/* free inodes */
 	buf->f_fsid.val[0] = (u32)id;
 	buf->f_fsid.val[1] = (u32)(id >> 32);
 	buf->f_namelen = EFS_MAXNAMELEN;	/* max filename length */

 	return 0;
 }
	/*
	* super.c
	*
	* Copyright (c) 1999 Al Smith
	*
	* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/exportfs.h>
	#include <linux/slab.h>
	#include <linux/buffer_head.h>
	#include <linux/vfs.h>

	#include "efs.h"
	#include <linux/efs_vh.h>
	#include <linux/efs_fs_sb.h>

	static int efs_statfs(struct dentry dentry, struct kstatfs buf);
	static int efs_fill_super(struct super_block s, void d, int silent);

	static struct dentry efs_mount(struct file_system_type fs_type,
	int flags, const char dev_name, void data)
	{
	return mount_bdev(fs_type, flags, dev_name, data, efs_fill_super);
	}

	static struct file_system_type efs_fs_type = {
	.owner = THIS_MODULE,
	.name = "efs",
	.mount = efs_mount,
	.kill_sb = kill_block_super,
	.fs_flags = FS_REQUIRES_DEV,
	};

	static struct pt_types sgi_pt_types[] = {
	{0x00, "SGI vh"},
	{0x01, "SGI trkrepl"},
	{0x02, "SGI secrepl"},
	{0x03, "SGI raw"},
	{0x04, "SGI bsd"},
	{SGI_SYSV, "SGI sysv"},
	{0x06, "SGI vol"},
	{SGI_EFS, "SGI efs"},
	{0x08, "SGI lv"},
	{0x09, "SGI rlv"},
	{0x0A, "SGI xfs"},
	{0x0B, "SGI xfslog"},
	{0x0C, "SGI xlv"},
	{0x82, "Linux swap"},
	{0x83, "Linux native"},
	{0, NULL}
	};


	static struct kmem_cache * efs_inode_cachep;

	static struct inode efs_alloc_inode(struct super_block sb)
	{
	struct efs_inode_info *ei;
	ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL);
	if (!ei)
	return NULL;
	return &ei->vfs_inode;
	}

	static void efs_i_callback(struct rcu_head *head)
	{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
	}

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

	static void init_once(void *foo)
	{
	struct efs_inode_info ei = (struct efs_inode_info ) foo;

	inode_init_once(&ei->vfs_inode);
	}

	static int init_inodecache(void)
	{
	efs_inode_cachep = kmem_cache_create("efs_inode_cache",
	sizeof(struct efs_inode_info),
	0, SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
	init_once);
	if (efs_inode_cachep == NULL)
	return -ENOMEM;
	return 0;
	}

	static void destroy_inodecache(void)
	{
	kmem_cache_destroy(efs_inode_cachep);
	}

	static void efs_put_super(struct super_block *s)
	{
	kfree(s->s_fs_info);
	s->s_fs_info = NULL;
	}

	static int efs_remount(struct super_block sb, int flags, char *data)
	{
	*flags \|= MS_RDONLY;
	return 0;
	}

	static const struct super_operations efs_superblock_operations = {
	.alloc_inode = efs_alloc_inode,
	.destroy_inode = efs_destroy_inode,
	.put_super = efs_put_super,
	.statfs = efs_statfs,
	.remount_fs = efs_remount,
	};

	static const struct export_operations efs_export_ops = {
	.fh_to_dentry = efs_fh_to_dentry,
	.fh_to_parent = efs_fh_to_parent,
	.get_parent = efs_get_parent,
	};

	static int __init init_efs_fs(void) {
	int err;
	printk("EFS: "EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
	err = init_inodecache();
	if (err)
	goto out1;
	err = register_filesystem(&efs_fs_type);
	if (err)
	goto out;
	return 0;
	out:
	destroy_inodecache();
	out1:
	return err;
	}

	static void __exit exit_efs_fs(void) {
	unregister_filesystem(&efs_fs_type);
	destroy_inodecache();
	}

	module_init(init_efs_fs)
	module_exit(exit_efs_fs)

	static efs_block_t efs_validate_vh(struct volume_header *vh) {
	int i;
	__be32 cs, *ui;
	int csum;
	efs_block_t sblock = 0; /* shuts up gcc */
	struct pt_types *pt_entry;
	int pt_type, slice = -1;

	if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
	/*
	* assume that we're dealing with a partition and allow
	* read_super() to try and detect a valid superblock
	* on the next block.
	*/
	return 0;
	}

	ui = ((__be32 *) (vh + 1)) - 1;
	for(csum = 0; ui >= ((__be32 *) vh);) {
	cs = *ui--;
	csum += be32_to_cpu(cs);
	}
	if (csum) {
	printk(KERN_INFO "EFS: SGI disklabel: checksum bad, label corrupted\n");
	return 0;
	}

	#ifdef DEBUG
	printk(KERN_DEBUG "EFS: bf: \"%16s\"\n", vh->vh_bootfile);

	for(i = 0; i < NVDIR; i++) {
	int j;
	char name[VDNAMESIZE+1];

	for(j = 0; j < VDNAMESIZE; j++) {
	name[j] = vh->vh_vd[i].vd_name[j];
	}
	name[j] = (char) 0;

	if (name[0]) {
	printk(KERN_DEBUG "EFS: vh: %8s block: 0x%08x size: 0x%08x\n",
	name,
	(int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
	(int) be32_to_cpu(vh->vh_vd[i].vd_nbytes));
	}
	}
	#endif

	for(i = 0; i < NPARTAB; i++) {
	pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type);
	for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) {
	if (pt_type == pt_entry->pt_type) break;
	}
	#ifdef DEBUG
	if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) {
	printk(KERN_DEBUG "EFS: pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
	i,
	(int) be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
	(int) be32_to_cpu(vh->vh_pt[i].pt_nblks),
	pt_type,
	(pt_entry->pt_name) ? pt_entry->pt_name : "unknown");
	}
	#endif
	if (IS_EFS(pt_type)) {
	sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
	slice = i;
	}
	}

	if (slice == -1) {
	printk(KERN_NOTICE "EFS: partition table contained no EFS partitions\n");
	#ifdef DEBUG
	} else {
	printk(KERN_INFO "EFS: using slice %d (type %s, offset 0x%x)\n",
	slice,
	(pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
	sblock);
	#endif
	}
	return sblock;
	}

	static int efs_validate_super(struct efs_sb_info sb, struct efs_super super) {

	if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic)))
	return -1;

	sb->fs_magic = be32_to_cpu(super->fs_magic);
	sb->total_blocks = be32_to_cpu(super->fs_size);
	sb->first_block = be32_to_cpu(super->fs_firstcg);
	sb->group_size = be32_to_cpu(super->fs_cgfsize);
	sb->data_free = be32_to_cpu(super->fs_tfree);
	sb->inode_free = be32_to_cpu(super->fs_tinode);
	sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
	sb->total_groups = be16_to_cpu(super->fs_ncg);

	return 0;
	}

	static int efs_fill_super(struct super_block s, void d, int silent)
	{
	struct efs_sb_info *sb;
	struct buffer_head *bh;
	struct inode *root;
	int ret = -EINVAL;

	sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
	if (!sb)
	return -ENOMEM;
	s->s_fs_info = sb;

	s->s_magic = EFS_SUPER_MAGIC;
	if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
	printk(KERN_ERR "EFS: device does not support %d byte blocks\n",
	EFS_BLOCKSIZE);
	goto out_no_fs_ul;
	}

	/* read the vh (volume header) block */
	bh = sb_bread(s, 0);

	if (!bh) {
	printk(KERN_ERR "EFS: cannot read volume header\n");
	goto out_no_fs_ul;
	}

	/*
	* if this returns zero then we didn't find any partition table.
	* this isn't (yet) an error - just assume for the moment that
	* the device is valid and go on to search for a superblock.
	*/
	sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
	brelse(bh);

	if (sb->fs_start == -1) {
	goto out_no_fs_ul;
	}

	bh = sb_bread(s, sb->fs_start + EFS_SUPER);
	if (!bh) {
	printk(KERN_ERR "EFS: cannot read superblock\n");
	goto out_no_fs_ul;
	}

	if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
	#ifdef DEBUG
	printk(KERN_WARNING "EFS: invalid superblock at block %u\n", sb->fs_start + EFS_SUPER);
	#endif
	brelse(bh);
	goto out_no_fs_ul;
	}
	brelse(bh);

	if (!(s->s_flags & MS_RDONLY)) {
	#ifdef DEBUG
	printk(KERN_INFO "EFS: forcing read-only mode\n");
	#endif
	s->s_flags \|= MS_RDONLY;
	}
	s->s_op = &efs_superblock_operations;
	s->s_export_op = &efs_export_ops;
	root = efs_iget(s, EFS_ROOTINODE);
	if (IS_ERR(root)) {
	printk(KERN_ERR "EFS: get root inode failed\n");
	ret = PTR_ERR(root);
	goto out_no_fs;
	}

	s->s_root = d_alloc_root(root);
	if (!(s->s_root)) {
	printk(KERN_ERR "EFS: get root dentry failed\n");
	iput(root);
	ret = -ENOMEM;
	goto out_no_fs;
	}

	return 0;

	out_no_fs_ul:
	out_no_fs:
	s->s_fs_info = NULL;
	kfree(sb);
	return ret;
	}

	static int efs_statfs(struct dentry dentry, struct kstatfs buf) {
	struct super_block *sb = dentry->d_sb;
	struct efs_sb_info *sbi = SUPER_INFO(sb);
	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

	buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */
	buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */
	buf->f_blocks = sbi->total_groups * /* total data blocks */
	(sbi->group_size - sbi->inode_blocks);
	buf->f_bfree = sbi->data_free; /* free data blocks */
	buf->f_bavail = sbi->data_free; /* free blocks for non-root */
	buf->f_files = sbi->total_groups * /* total inodes */
	sbi->inode_blocks *
	(EFS_BLOCKSIZE / sizeof(struct efs_dinode));
	buf->f_ffree = sbi->inode_free; /* free inodes */
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);
	buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */

	return 0;
	}