fs/squashfs/inode.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Squashfs - a compressed read only filesystem for Linux
  *
  * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
  * Phillip Lougher <phillip@squashfs.org.uk>
  *
  * inode.c
  */

 /*
  * This file implements code to create and read inodes from disk.
  *
  * Inodes in Squashfs are identified by a 48-bit inode which encodes the
  * location of the compressed metadata block containing the inode, and the byte
  * offset into that block where the inode is placed (<block, offset>).
  *
  * To maximise compression there are different inodes for each file type
  * (regular file, directory, device, etc.), the inode contents and length
  * varying with the type.
  *
  * To further maximise compression, two types of regular file inode and
  * directory inode are defined: inodes optimised for frequently occurring
  * regular files and directories, and extended types where extra
  * information has to be stored.
  */

 #include <linux/fs.h>
 #include <linux/vfs.h>
 #include <linux/xattr.h>
 #include <linux/pagemap.h>

 #include "squashfs_fs.h"
 #include "squashfs_fs_sb.h"
 #include "squashfs_fs_i.h"
 #include "squashfs.h"
 #include "xattr.h"

 /*
  * Initialise VFS inode with the base inode information common to all
  * Squashfs inode types.  Sqsh_ino contains the unswapped base inode
  * off disk.
  */
 static int squashfs_new_inode(struct super_block *sb, struct inode *inode,
 				struct squashfs_base_inode *sqsh_ino)
 {
 	uid_t i_uid;
 	gid_t i_gid;
 	int err;

 	inode->i_ino = le32_to_cpu(sqsh_ino->inode_number);
 	if (inode->i_ino == 0)
 		return -EINVAL;

 	err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->uid), &i_uid);
 	if (err)
 		return err;

 	err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->guid), &i_gid);
 	if (err)
 		return err;

 	i_uid_write(inode, i_uid);
 	i_gid_write(inode, i_gid);
 	inode_set_mtime(inode, le32_to_cpu(sqsh_ino->mtime), 0);
 	inode_set_atime(inode, inode_get_mtime_sec(inode), 0);
 	inode_set_ctime(inode, inode_get_mtime_sec(inode), 0);
 	inode->i_mode = le16_to_cpu(sqsh_ino->mode);
 	inode->i_size = 0;

 	return err;
 }


 struct inode *squashfs_iget(struct super_block *sb, long long ino,
 				unsigned int ino_number)
 {
 	struct inode *inode = iget_locked(sb, ino_number);
 	int err;

 	TRACE("Entered squashfs_iget\n");

 	if (!inode)
 		return ERR_PTR(-ENOMEM);
 	if (!(inode->i_state & I_NEW))
 		return inode;

 	err = squashfs_read_inode(inode, ino);
 	if (err) {
 		iget_failed(inode);
 		return ERR_PTR(err);
 	}

 	unlock_new_inode(inode);
 	return inode;
 }


 /*
  * Initialise VFS inode by reading inode from inode table (compressed
  * metadata).  The format and amount of data read depends on type.
  */
 int squashfs_read_inode(struct inode *inode, long long ino)
 {
 	struct super_block *sb = inode->i_sb;
 	struct squashfs_sb_info *msblk = sb->s_fs_info;
 	u64 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
 	int err, type, offset = SQUASHFS_INODE_OFFSET(ino);
 	union squashfs_inode squashfs_ino;
 	struct squashfs_base_inode *sqshb_ino = &squashfs_ino.base;
 	int xattr_id = SQUASHFS_INVALID_XATTR;

 	TRACE("Entered squashfs_read_inode\n");

 	/*
 	 * Read inode base common to all inode types.
 	 */
 	err = squashfs_read_metadata(sb, sqshb_ino, &block,
 				&offset, sizeof(*sqshb_ino));
 	if (err < 0)
 		goto failed_read;

 	err = squashfs_new_inode(sb, inode, sqshb_ino);
 	if (err)
 		goto failed_read;

 	block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
 	offset = SQUASHFS_INODE_OFFSET(ino);

 	type = le16_to_cpu(sqshb_ino->inode_type);
 	switch (type) {
 	case SQUASHFS_REG_TYPE: {
 		unsigned int frag_offset, frag;
 		int frag_size;
 		u64 frag_blk;
 		struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg;

 		err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
 							sizeof(*sqsh_ino));
 		if (err < 0)
 			goto failed_read;

 		frag = le32_to_cpu(sqsh_ino->fragment);
 		if (frag != SQUASHFS_INVALID_FRAG) {
 			frag_offset = le32_to_cpu(sqsh_ino->offset);
 			frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
 			if (frag_size < 0) {
 				err = frag_size;
 				goto failed_read;
 			}
 		} else {
 			frag_blk = SQUASHFS_INVALID_BLK;
 			frag_size = 0;
 			frag_offset = 0;
 		}

 		set_nlink(inode, 1);
 		inode->i_size = le32_to_cpu(sqsh_ino->file_size);
 		inode->i_fop = &generic_ro_fops;
 		inode->i_mode |= S_IFREG;
 		inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
 		squashfs_i(inode)->fragment_block = frag_blk;
 		squashfs_i(inode)->fragment_size = frag_size;
 		squashfs_i(inode)->fragment_offset = frag_offset;
 		squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
 		squashfs_i(inode)->block_list_start = block;
 		squashfs_i(inode)->offset = offset;
 		inode->i_data.a_ops = &squashfs_aops;

 		TRACE("File inode %x:%x, start_block %llx, block_list_start "
 			"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
 			offset, squashfs_i(inode)->start, block, offset);
 		break;
 	}
 	case SQUASHFS_LREG_TYPE: {
 		unsigned int frag_offset, frag;
 		int frag_size;
 		u64 frag_blk;
 		struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg;

 		err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
 							sizeof(*sqsh_ino));
 		if (err < 0)
 			goto failed_read;

 		frag = le32_to_cpu(sqsh_ino->fragment);
 		if (frag != SQUASHFS_INVALID_FRAG) {
 			frag_offset = le32_to_cpu(sqsh_ino->offset);
 			frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
 			if (frag_size < 0) {
 				err = frag_size;
 				goto failed_read;
 			}
 		} else {
 			frag_blk = SQUASHFS_INVALID_BLK;
 			frag_size = 0;
 			frag_offset = 0;
 		}

 		xattr_id = le32_to_cpu(sqsh_ino->xattr);
 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
 		inode->i_size = le64_to_cpu(sqsh_ino->file_size);
 		inode->i_op = &squashfs_inode_ops;
 		inode->i_fop = &generic_ro_fops;
 		inode->i_mode |= S_IFREG;
 		inode->i_blocks = (inode->i_size -
 				le64_to_cpu(sqsh_ino->sparse) + 511) >> 9;

 		squashfs_i(inode)->fragment_block = frag_blk;
 		squashfs_i(inode)->fragment_size = frag_size;
 		squashfs_i(inode)->fragment_offset = frag_offset;
 		squashfs_i(inode)->start = le64_to_cpu(sqsh_ino->start_block);
 		squashfs_i(inode)->block_list_start = block;
 		squashfs_i(inode)->offset = offset;
 		inode->i_data.a_ops = &squashfs_aops;

 		TRACE("File inode %x:%x, start_block %llx, block_list_start "
 			"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
 			offset, squashfs_i(inode)->start, block, offset);
 		break;
 	}
 	case SQUASHFS_DIR_TYPE: {
 		struct squashfs_dir_inode *sqsh_ino = &squashfs_ino.dir;

 		err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
 				sizeof(*sqsh_ino));
 		if (err < 0)
 			goto failed_read;

 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
 		inode->i_size = le16_to_cpu(sqsh_ino->file_size);
 		inode->i_op = &squashfs_dir_inode_ops;
 		inode->i_fop = &squashfs_dir_ops;
 		inode->i_mode |= S_IFDIR;
 		squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
 		squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
 		squashfs_i(inode)->dir_idx_cnt = 0;
 		squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);

 		TRACE("Directory inode %x:%x, start_block %llx, offset %x\n",
 				SQUASHFS_INODE_BLK(ino), offset,
 				squashfs_i(inode)->start,
 				le16_to_cpu(sqsh_ino->offset));
 		break;
 	}
 	case SQUASHFS_LDIR_TYPE: {
 		struct squashfs_ldir_inode *sqsh_ino = &squashfs_ino.ldir;

 		err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
 				sizeof(*sqsh_ino));
 		if (err < 0)
 			goto failed_read;

 		xattr_id = le32_to_cpu(sqsh_ino->xattr);
 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
 		inode->i_size = le32_to_cpu(sqsh_ino->file_size);
 		inode->i_op = &squashfs_dir_inode_ops;
 		inode->i_fop = &squashfs_dir_ops;
 		inode->i_mode |= S_IFDIR;
 		squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
 		squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
 		squashfs_i(inode)->dir_idx_start = block;
 		squashfs_i(inode)->dir_idx_offset = offset;
 		squashfs_i(inode)->dir_idx_cnt = le16_to_cpu(sqsh_ino->i_count);
 		squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);

 		TRACE("Long directory inode %x:%x, start_block %llx, offset "
 				"%x\n", SQUASHFS_INODE_BLK(ino), offset,
 				squashfs_i(inode)->start,
 				le16_to_cpu(sqsh_ino->offset));
 		break;
 	}
 	case SQUASHFS_SYMLINK_TYPE:
 	case SQUASHFS_LSYMLINK_TYPE: {
 		struct squashfs_symlink_inode *sqsh_ino = &squashfs_ino.symlink;

 		err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
 				sizeof(*sqsh_ino));
 		if (err < 0)
 			goto failed_read;

 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
 		inode->i_size = le32_to_cpu(sqsh_ino->symlink_size);
 		inode->i_op = &squashfs_symlink_inode_ops;
 		inode_nohighmem(inode);
 		inode->i_data.a_ops = &squashfs_symlink_aops;
 		inode->i_mode |= S_IFLNK;
 		squashfs_i(inode)->start = block;
 		squashfs_i(inode)->offset = offset;

 		if (type == SQUASHFS_LSYMLINK_TYPE) {
 			__le32 xattr;

 			err = squashfs_read_metadata(sb, NULL, &block,
 						&offset, inode->i_size);
 			if (err < 0)
 				goto failed_read;
 			err = squashfs_read_metadata(sb, &xattr, &block,
 						&offset, sizeof(xattr));
 			if (err < 0)
 				goto failed_read;
 			xattr_id = le32_to_cpu(xattr);
 		}

 		TRACE("Symbolic link inode %x:%x, start_block %llx, offset "
 				"%x\n", SQUASHFS_INODE_BLK(ino), offset,
 				block, offset);
 		break;
 	}
 	case SQUASHFS_BLKDEV_TYPE:
 	case SQUASHFS_CHRDEV_TYPE: {
 		struct squashfs_dev_inode *sqsh_ino = &squashfs_ino.dev;
 		unsigned int rdev;

 		err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
 				sizeof(*sqsh_ino));
 		if (err < 0)
 			goto failed_read;

 		if (type == SQUASHFS_CHRDEV_TYPE)
 			inode->i_mode |= S_IFCHR;
 		else
 			inode->i_mode |= S_IFBLK;
 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
 		rdev = le32_to_cpu(sqsh_ino->rdev);
 		init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));

 		TRACE("Device inode %x:%x, rdev %x\n",
 				SQUASHFS_INODE_BLK(ino), offset, rdev);
 		break;
 	}
 	case SQUASHFS_LBLKDEV_TYPE:
 	case SQUASHFS_LCHRDEV_TYPE: {
 		struct squashfs_ldev_inode *sqsh_ino = &squashfs_ino.ldev;
 		unsigned int rdev;

 		err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
 				sizeof(*sqsh_ino));
 		if (err < 0)
 			goto failed_read;

 		if (type == SQUASHFS_LCHRDEV_TYPE)
 			inode->i_mode |= S_IFCHR;
 		else
 			inode->i_mode |= S_IFBLK;
 		xattr_id = le32_to_cpu(sqsh_ino->xattr);
 		inode->i_op = &squashfs_inode_ops;
 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
 		rdev = le32_to_cpu(sqsh_ino->rdev);
 		init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));

 		TRACE("Device inode %x:%x, rdev %x\n",
 				SQUASHFS_INODE_BLK(ino), offset, rdev);
 		break;
 	}
 	case SQUASHFS_FIFO_TYPE:
 	case SQUASHFS_SOCKET_TYPE: {
 		struct squashfs_ipc_inode *sqsh_ino = &squashfs_ino.ipc;

 		err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
 				sizeof(*sqsh_ino));
 		if (err < 0)
 			goto failed_read;

 		if (type == SQUASHFS_FIFO_TYPE)
 			inode->i_mode |= S_IFIFO;
 		else
 			inode->i_mode |= S_IFSOCK;
 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
 		init_special_inode(inode, inode->i_mode, 0);
 		break;
 	}
 	case SQUASHFS_LFIFO_TYPE:
 	case SQUASHFS_LSOCKET_TYPE: {
 		struct squashfs_lipc_inode *sqsh_ino = &squashfs_ino.lipc;

 		err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
 				sizeof(*sqsh_ino));
 		if (err < 0)
 			goto failed_read;

 		if (type == SQUASHFS_LFIFO_TYPE)
 			inode->i_mode |= S_IFIFO;
 		else
 			inode->i_mode |= S_IFSOCK;
 		xattr_id = le32_to_cpu(sqsh_ino->xattr);
 		inode->i_op = &squashfs_inode_ops;
 		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
 		init_special_inode(inode, inode->i_mode, 0);
 		break;
 	}
 	default:
 		ERROR("Unknown inode type %d in squashfs_iget!\n", type);
 		return -EINVAL;
 	}

 	if (xattr_id != SQUASHFS_INVALID_XATTR && msblk->xattr_id_table) {
 		err = squashfs_xattr_lookup(sb, xattr_id,
 					&squashfs_i(inode)->xattr_count,
 					&squashfs_i(inode)->xattr_size,
 					&squashfs_i(inode)->xattr);
 		if (err < 0)
 			goto failed_read;
 		inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9)
 				+ 1;
 	} else
 		squashfs_i(inode)->xattr_count = 0;

 	return 0;

 failed_read:
 	ERROR("Unable to read inode 0x%llx\n", ino);
 	return err;
 }


 const struct inode_operations squashfs_inode_ops = {
 	.listxattr = squashfs_listxattr
 };
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Squashfs - a compressed read only filesystem for Linux
	*
	* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
	* Phillip Lougher <phillip@squashfs.org.uk>
	*
	* inode.c
	*/

	/*
	* This file implements code to create and read inodes from disk.
	*
	* Inodes in Squashfs are identified by a 48-bit inode which encodes the
	* location of the compressed metadata block containing the inode, and the byte
	* offset into that block where the inode is placed (<block, offset>).
	*
	* To maximise compression there are different inodes for each file type
	* (regular file, directory, device, etc.), the inode contents and length
	* varying with the type.
	*
	* To further maximise compression, two types of regular file inode and
	* directory inode are defined: inodes optimised for frequently occurring
	* regular files and directories, and extended types where extra
	* information has to be stored.
	*/

	#include <linux/fs.h>
	#include <linux/vfs.h>
	#include <linux/xattr.h>
	#include <linux/pagemap.h>

	#include "squashfs_fs.h"
	#include "squashfs_fs_sb.h"
	#include "squashfs_fs_i.h"
	#include "squashfs.h"
	#include "xattr.h"

	/*
	* Initialise VFS inode with the base inode information common to all
	* Squashfs inode types. Sqsh_ino contains the unswapped base inode
	* off disk.
	*/
	static int squashfs_new_inode(struct super_block sb, struct inode inode,
	struct squashfs_base_inode *sqsh_ino)
	{
	uid_t i_uid;
	gid_t i_gid;
	int err;

	inode->i_ino = le32_to_cpu(sqsh_ino->inode_number);
	if (inode->i_ino == 0)
	return -EINVAL;

	err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->uid), &i_uid);
	if (err)
	return err;

	err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->guid), &i_gid);
	if (err)
	return err;

	i_uid_write(inode, i_uid);
	i_gid_write(inode, i_gid);
	inode_set_mtime(inode, le32_to_cpu(sqsh_ino->mtime), 0);
	inode_set_atime(inode, inode_get_mtime_sec(inode), 0);
	inode_set_ctime(inode, inode_get_mtime_sec(inode), 0);
	inode->i_mode = le16_to_cpu(sqsh_ino->mode);
	inode->i_size = 0;

	return err;
	}


	struct inode squashfs_iget(struct super_block sb, long long ino,
	unsigned int ino_number)
	{
	struct inode *inode = iget_locked(sb, ino_number);
	int err;

	TRACE("Entered squashfs_iget\n");

	if (!inode)
	return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
	return inode;

	err = squashfs_read_inode(inode, ino);
	if (err) {
	iget_failed(inode);
	return ERR_PTR(err);
	}

	unlock_new_inode(inode);
	return inode;
	}


	/*
	* Initialise VFS inode by reading inode from inode table (compressed
	* metadata). The format and amount of data read depends on type.
	*/
	int squashfs_read_inode(struct inode *inode, long long ino)
	{
	struct super_block *sb = inode->i_sb;
	struct squashfs_sb_info *msblk = sb->s_fs_info;
	u64 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
	int err, type, offset = SQUASHFS_INODE_OFFSET(ino);
	union squashfs_inode squashfs_ino;
	struct squashfs_base_inode *sqshb_ino = &squashfs_ino.base;
	int xattr_id = SQUASHFS_INVALID_XATTR;

	TRACE("Entered squashfs_read_inode\n");

	/*
	* Read inode base common to all inode types.
	*/
	err = squashfs_read_metadata(sb, sqshb_ino, &block,
	&offset, sizeof(*sqshb_ino));
	if (err < 0)
	goto failed_read;

	err = squashfs_new_inode(sb, inode, sqshb_ino);
	if (err)
	goto failed_read;

	block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
	offset = SQUASHFS_INODE_OFFSET(ino);

	type = le16_to_cpu(sqshb_ino->inode_type);
	switch (type) {
	case SQUASHFS_REG_TYPE: {
	unsigned int frag_offset, frag;
	int frag_size;
	u64 frag_blk;
	struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg;

	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	sizeof(*sqsh_ino));
	if (err < 0)
	goto failed_read;

	frag = le32_to_cpu(sqsh_ino->fragment);
	if (frag != SQUASHFS_INVALID_FRAG) {
	frag_offset = le32_to_cpu(sqsh_ino->offset);
	frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
	if (frag_size < 0) {
	err = frag_size;
	goto failed_read;
	}
	} else {
	frag_blk = SQUASHFS_INVALID_BLK;
	frag_size = 0;
	frag_offset = 0;
	}

	set_nlink(inode, 1);
	inode->i_size = le32_to_cpu(sqsh_ino->file_size);
	inode->i_fop = &generic_ro_fops;
	inode->i_mode \|= S_IFREG;
	inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
	squashfs_i(inode)->fragment_block = frag_blk;
	squashfs_i(inode)->fragment_size = frag_size;
	squashfs_i(inode)->fragment_offset = frag_offset;
	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	squashfs_i(inode)->block_list_start = block;
	squashfs_i(inode)->offset = offset;
	inode->i_data.a_ops = &squashfs_aops;

	TRACE("File inode %x:%x, start_block %llx, block_list_start "
	"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
	offset, squashfs_i(inode)->start, block, offset);
	break;
	}
	case SQUASHFS_LREG_TYPE: {
	unsigned int frag_offset, frag;
	int frag_size;
	u64 frag_blk;
	struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg;

	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	sizeof(*sqsh_ino));
	if (err < 0)
	goto failed_read;

	frag = le32_to_cpu(sqsh_ino->fragment);
	if (frag != SQUASHFS_INVALID_FRAG) {
	frag_offset = le32_to_cpu(sqsh_ino->offset);
	frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
	if (frag_size < 0) {
	err = frag_size;
	goto failed_read;
	}
	} else {
	frag_blk = SQUASHFS_INVALID_BLK;
	frag_size = 0;
	frag_offset = 0;
	}

	xattr_id = le32_to_cpu(sqsh_ino->xattr);
	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
	inode->i_size = le64_to_cpu(sqsh_ino->file_size);
	inode->i_op = &squashfs_inode_ops;
	inode->i_fop = &generic_ro_fops;
	inode->i_mode \|= S_IFREG;
	inode->i_blocks = (inode->i_size -
	le64_to_cpu(sqsh_ino->sparse) + 511) >> 9;

	squashfs_i(inode)->fragment_block = frag_blk;
	squashfs_i(inode)->fragment_size = frag_size;
	squashfs_i(inode)->fragment_offset = frag_offset;
	squashfs_i(inode)->start = le64_to_cpu(sqsh_ino->start_block);
	squashfs_i(inode)->block_list_start = block;
	squashfs_i(inode)->offset = offset;
	inode->i_data.a_ops = &squashfs_aops;

	TRACE("File inode %x:%x, start_block %llx, block_list_start "
	"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
	offset, squashfs_i(inode)->start, block, offset);
	break;
	}
	case SQUASHFS_DIR_TYPE: {
	struct squashfs_dir_inode *sqsh_ino = &squashfs_ino.dir;

	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	sizeof(*sqsh_ino));
	if (err < 0)
	goto failed_read;

	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
	inode->i_size = le16_to_cpu(sqsh_ino->file_size);
	inode->i_op = &squashfs_dir_inode_ops;
	inode->i_fop = &squashfs_dir_ops;
	inode->i_mode \|= S_IFDIR;
	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
	squashfs_i(inode)->dir_idx_cnt = 0;
	squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);

	TRACE("Directory inode %x:%x, start_block %llx, offset %x\n",
	SQUASHFS_INODE_BLK(ino), offset,
	squashfs_i(inode)->start,
	le16_to_cpu(sqsh_ino->offset));
	break;
	}
	case SQUASHFS_LDIR_TYPE: {
	struct squashfs_ldir_inode *sqsh_ino = &squashfs_ino.ldir;

	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	sizeof(*sqsh_ino));
	if (err < 0)
	goto failed_read;

	xattr_id = le32_to_cpu(sqsh_ino->xattr);
	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
	inode->i_size = le32_to_cpu(sqsh_ino->file_size);
	inode->i_op = &squashfs_dir_inode_ops;
	inode->i_fop = &squashfs_dir_ops;
	inode->i_mode \|= S_IFDIR;
	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
	squashfs_i(inode)->dir_idx_start = block;
	squashfs_i(inode)->dir_idx_offset = offset;
	squashfs_i(inode)->dir_idx_cnt = le16_to_cpu(sqsh_ino->i_count);
	squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);

	TRACE("Long directory inode %x:%x, start_block %llx, offset "
	"%x\n", SQUASHFS_INODE_BLK(ino), offset,
	squashfs_i(inode)->start,
	le16_to_cpu(sqsh_ino->offset));
	break;
	}
	case SQUASHFS_SYMLINK_TYPE:
	case SQUASHFS_LSYMLINK_TYPE: {
	struct squashfs_symlink_inode *sqsh_ino = &squashfs_ino.symlink;

	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	sizeof(*sqsh_ino));
	if (err < 0)
	goto failed_read;

	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
	inode->i_size = le32_to_cpu(sqsh_ino->symlink_size);
	inode->i_op = &squashfs_symlink_inode_ops;
	inode_nohighmem(inode);
	inode->i_data.a_ops = &squashfs_symlink_aops;
	inode->i_mode \|= S_IFLNK;
	squashfs_i(inode)->start = block;
	squashfs_i(inode)->offset = offset;

	if (type == SQUASHFS_LSYMLINK_TYPE) {
	__le32 xattr;

	err = squashfs_read_metadata(sb, NULL, &block,
	&offset, inode->i_size);
	if (err < 0)
	goto failed_read;
	err = squashfs_read_metadata(sb, &xattr, &block,
	&offset, sizeof(xattr));
	if (err < 0)
	goto failed_read;
	xattr_id = le32_to_cpu(xattr);
	}

	TRACE("Symbolic link inode %x:%x, start_block %llx, offset "
	"%x\n", SQUASHFS_INODE_BLK(ino), offset,
	block, offset);
	break;
	}
	case SQUASHFS_BLKDEV_TYPE:
	case SQUASHFS_CHRDEV_TYPE: {
	struct squashfs_dev_inode *sqsh_ino = &squashfs_ino.dev;
	unsigned int rdev;

	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	sizeof(*sqsh_ino));
	if (err < 0)
	goto failed_read;

	if (type == SQUASHFS_CHRDEV_TYPE)
	inode->i_mode \|= S_IFCHR;
	else
	inode->i_mode \|= S_IFBLK;
	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
	rdev = le32_to_cpu(sqsh_ino->rdev);
	init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));

	TRACE("Device inode %x:%x, rdev %x\n",
	SQUASHFS_INODE_BLK(ino), offset, rdev);
	break;
	}
	case SQUASHFS_LBLKDEV_TYPE:
	case SQUASHFS_LCHRDEV_TYPE: {
	struct squashfs_ldev_inode *sqsh_ino = &squashfs_ino.ldev;
	unsigned int rdev;

	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	sizeof(*sqsh_ino));
	if (err < 0)
	goto failed_read;

	if (type == SQUASHFS_LCHRDEV_TYPE)
	inode->i_mode \|= S_IFCHR;
	else
	inode->i_mode \|= S_IFBLK;
	xattr_id = le32_to_cpu(sqsh_ino->xattr);
	inode->i_op = &squashfs_inode_ops;
	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
	rdev = le32_to_cpu(sqsh_ino->rdev);
	init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));

	TRACE("Device inode %x:%x, rdev %x\n",
	SQUASHFS_INODE_BLK(ino), offset, rdev);
	break;
	}
	case SQUASHFS_FIFO_TYPE:
	case SQUASHFS_SOCKET_TYPE: {
	struct squashfs_ipc_inode *sqsh_ino = &squashfs_ino.ipc;

	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	sizeof(*sqsh_ino));
	if (err < 0)
	goto failed_read;

	if (type == SQUASHFS_FIFO_TYPE)
	inode->i_mode \|= S_IFIFO;
	else
	inode->i_mode \|= S_IFSOCK;
	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
	init_special_inode(inode, inode->i_mode, 0);
	break;
	}
	case SQUASHFS_LFIFO_TYPE:
	case SQUASHFS_LSOCKET_TYPE: {
	struct squashfs_lipc_inode *sqsh_ino = &squashfs_ino.lipc;

	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	sizeof(*sqsh_ino));
	if (err < 0)
	goto failed_read;

	if (type == SQUASHFS_LFIFO_TYPE)
	inode->i_mode \|= S_IFIFO;
	else
	inode->i_mode \|= S_IFSOCK;
	xattr_id = le32_to_cpu(sqsh_ino->xattr);
	inode->i_op = &squashfs_inode_ops;
	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
	init_special_inode(inode, inode->i_mode, 0);
	break;
	}
	default:
	ERROR("Unknown inode type %d in squashfs_iget!\n", type);
	return -EINVAL;
	}

	if (xattr_id != SQUASHFS_INVALID_XATTR && msblk->xattr_id_table) {
	err = squashfs_xattr_lookup(sb, xattr_id,
	&squashfs_i(inode)->xattr_count,
	&squashfs_i(inode)->xattr_size,
	&squashfs_i(inode)->xattr);
	if (err < 0)
	goto failed_read;
	inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9)
	+ 1;
	} else
	squashfs_i(inode)->xattr_count = 0;

	return 0;

	failed_read:
	ERROR("Unable to read inode 0x%llx\n", ino);
	return err;
	}


	const struct inode_operations squashfs_inode_ops = {
	.listxattr = squashfs_listxattr
	};