[linux.git] / fs / squashfs / inode.c

/*
 * Squashfs - a compressed read only filesystem for Linux
 *
 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
 * Phillip Lougher <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2,
 * or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * 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 "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;

	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->i_ino = le32_to_cpu(sqsh_ino->inode_number);
	inode->i_mtime.tv_sec = le32_to_cpu(sqsh_ino->mtime);
	inode->i_atime.tv_sec = inode->i_mtime.tv_sec;
	inode->i_ctime.tv_sec = inode->i_mtime.tv_sec;
	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->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 = {
	.getxattr = generic_getxattr,
	.listxattr = squashfs_listxattr
};
Commit	Line	Data
6545b246 PL	1	/*
	2	* Squashfs - a compressed read only filesystem for Linux
	3	*
	4	* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
d7f2ff67	5	* Phillip Lougher <[email protected]>
6545b246 PL	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version 2,
	10	* or (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	20	*
	21	* inode.c
	22	*/
	23
	24	/*
	25	* This file implements code to create and read inodes from disk.
	26	*
	27	* Inodes in Squashfs are identified by a 48-bit inode which encodes the
	28	* location of the compressed metadata block containing the inode, and the byte
	29	* offset into that block where the inode is placed (<block, offset>).
	30	*
	31	* To maximise compression there are different inodes for each file type
	32	* (regular file, directory, device, etc.), the inode contents and length
	33	* varying with the type.
	34	*
	35	* To further maximise compression, two types of regular file inode and
	36	* directory inode are defined: inodes optimised for frequently occurring
	37	* regular files and directories, and extended types where extra
	38	* information has to be stored.
	39	*/
	40
	41	#include <linux/fs.h>
	42	#include <linux/vfs.h>
67f66cc6	43	#include <linux/xattr.h>
6545b246 PL	44
	45	#include "squashfs_fs.h"
	46	#include "squashfs_fs_sb.h"
	47	#include "squashfs_fs_i.h"
	48	#include "squashfs.h"
01e5b4e4	49	#include "xattr.h"
6545b246 PL	50
	51	/*
	52	* Initialise VFS inode with the base inode information common to all
	53	* Squashfs inode types. Sqsh_ino contains the unswapped base inode
	54	* off disk.
	55	*/
	56	static int squashfs_new_inode(struct super_block sb, struct inode inode,
	57	struct squashfs_base_inode *sqsh_ino)
	58	{
61293ee2 EB	59	uid_t i_uid;
61293ee2 EB	60	gid_t i_gid;
6545b246 PL	61	int err;
6545b246 PL	62
61293ee2	63	err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->uid), &i_uid);
6545b246 PL	64	if (err)
	65	return err;
	66
61293ee2	67	err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->guid), &i_gid);
6545b246 PL	68	if (err)
	69	return err;
	70
61293ee2 EB	71	i_uid_write(inode, i_uid);
61293ee2 EB	72	i_gid_write(inode, i_gid);
6545b246 PL	73	inode->i_ino = le32_to_cpu(sqsh_ino->inode_number);
	74	inode->i_mtime.tv_sec = le32_to_cpu(sqsh_ino->mtime);
	75	inode->i_atime.tv_sec = inode->i_mtime.tv_sec;
	76	inode->i_ctime.tv_sec = inode->i_mtime.tv_sec;
	77	inode->i_mode = le16_to_cpu(sqsh_ino->mode);
	78	inode->i_size = 0;
	79
	80	return err;
	81	}
	82
	83
	84	struct inode squashfs_iget(struct super_block sb, long long ino,
	85	unsigned int ino_number)
	86	{
	87	struct inode *inode = iget_locked(sb, ino_number);
	88	int err;
	89
	90	TRACE("Entered squashfs_iget\n");
	91
	92	if (!inode)
	93	return ERR_PTR(-ENOMEM);
	94	if (!(inode->i_state & I_NEW))
	95	return inode;
	96
	97	err = squashfs_read_inode(inode, ino);
	98	if (err) {
	99	iget_failed(inode);
	100	return ERR_PTR(err);
	101	}
	102
	103	unlock_new_inode(inode);
	104	return inode;
	105	}
	106
	107
	108	/*
	109	* Initialise VFS inode by reading inode from inode table (compressed
	110	* metadata). The format and amount of data read depends on type.
	111	*/
	112	int squashfs_read_inode(struct inode *inode, long long ino)
	113	{
	114	struct super_block *sb = inode->i_sb;
	115	struct squashfs_sb_info *msblk = sb->s_fs_info;
	116	u64 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
	117	int err, type, offset = SQUASHFS_INODE_OFFSET(ino);
	118	union squashfs_inode squashfs_ino;
	119	struct squashfs_base_inode *sqshb_ino = &squashfs_ino.base;
67f66cc6	120	int xattr_id = SQUASHFS_INVALID_XATTR;
6545b246 PL	121
	122	TRACE("Entered squashfs_read_inode\n");
	123
	124	/*
	125	* Read inode base common to all inode types.
	126	*/
	127	err = squashfs_read_metadata(sb, sqshb_ino, &block,
	128	&offset, sizeof(*sqshb_ino));
	129	if (err < 0)
	130	goto failed_read;
	131
	132	err = squashfs_new_inode(sb, inode, sqshb_ino);
	133	if (err)
	134	goto failed_read;
	135
	136	block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
	137	offset = SQUASHFS_INODE_OFFSET(ino);
	138
	139	type = le16_to_cpu(sqshb_ino->inode_type);
	140	switch (type) {
	141	case SQUASHFS_REG_TYPE: {
f4f8056a RK	142	unsigned int frag_offset, frag;
f4f8056a RK	143	int frag_size;
6545b246 PL	144	u64 frag_blk;
	145	struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg;
	146
	147	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	148	sizeof(*sqsh_ino));
	149	if (err < 0)
	150	goto failed_read;
	151
	152	frag = le32_to_cpu(sqsh_ino->fragment);
	153	if (frag != SQUASHFS_INVALID_FRAG) {
	154	frag_offset = le32_to_cpu(sqsh_ino->offset);
	155	frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
	156	if (frag_size < 0) {
	157	err = frag_size;
	158	goto failed_read;
	159	}
	160	} else {
	161	frag_blk = SQUASHFS_INVALID_BLK;
	162	frag_size = 0;
	163	frag_offset = 0;
	164	}
	165
bfe86848	166	set_nlink(inode, 1);
6545b246 PL	167	inode->i_size = le32_to_cpu(sqsh_ino->file_size);
	168	inode->i_fop = &generic_ro_fops;
	169	inode->i_mode \|= S_IFREG;
	170	inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
	171	squashfs_i(inode)->fragment_block = frag_blk;
	172	squashfs_i(inode)->fragment_size = frag_size;
	173	squashfs_i(inode)->fragment_offset = frag_offset;
	174	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	175	squashfs_i(inode)->block_list_start = block;
	176	squashfs_i(inode)->offset = offset;
	177	inode->i_data.a_ops = &squashfs_aops;
	178
	179	TRACE("File inode %x:%x, start_block %llx, block_list_start "
	180	"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
	181	offset, squashfs_i(inode)->start, block, offset);
	182	break;
	183	}
	184	case SQUASHFS_LREG_TYPE: {
f4f8056a RK	185	unsigned int frag_offset, frag;
f4f8056a RK	186	int frag_size;
6545b246 PL	187	u64 frag_blk;
	188	struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg;
	189
	190	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	191	sizeof(*sqsh_ino));
	192	if (err < 0)
	193	goto failed_read;
	194
	195	frag = le32_to_cpu(sqsh_ino->fragment);
	196	if (frag != SQUASHFS_INVALID_FRAG) {
	197	frag_offset = le32_to_cpu(sqsh_ino->offset);
	198	frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
	199	if (frag_size < 0) {
	200	err = frag_size;
	201	goto failed_read;
	202	}
	203	} else {
	204	frag_blk = SQUASHFS_INVALID_BLK;
	205	frag_size = 0;
	206	frag_offset = 0;
	207	}
	208
67f66cc6	209	xattr_id = le32_to_cpu(sqsh_ino->xattr);
bfe86848	210	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246	211	inode->i_size = le64_to_cpu(sqsh_ino->file_size);
67f66cc6	212	inode->i_op = &squashfs_inode_ops;
6545b246 PL	213	inode->i_fop = &generic_ro_fops;
6545b246 PL	214	inode->i_mode \|= S_IFREG;
3d4a1c80 PL	215	inode->i_blocks = (inode->i_size -
3d4a1c80 PL	216	le64_to_cpu(sqsh_ino->sparse) + 511) >> 9;
6545b246 PL	217
	218	squashfs_i(inode)->fragment_block = frag_blk;
	219	squashfs_i(inode)->fragment_size = frag_size;
	220	squashfs_i(inode)->fragment_offset = frag_offset;
	221	squashfs_i(inode)->start = le64_to_cpu(sqsh_ino->start_block);
	222	squashfs_i(inode)->block_list_start = block;
	223	squashfs_i(inode)->offset = offset;
	224	inode->i_data.a_ops = &squashfs_aops;
	225
	226	TRACE("File inode %x:%x, start_block %llx, block_list_start "
	227	"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
	228	offset, squashfs_i(inode)->start, block, offset);
	229	break;
	230	}
	231	case SQUASHFS_DIR_TYPE: {
	232	struct squashfs_dir_inode *sqsh_ino = &squashfs_ino.dir;
	233
	234	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	235	sizeof(*sqsh_ino));
	236	if (err < 0)
	237	goto failed_read;
	238
bfe86848	239	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	240	inode->i_size = le16_to_cpu(sqsh_ino->file_size);
	241	inode->i_op = &squashfs_dir_inode_ops;
	242	inode->i_fop = &squashfs_dir_ops;
	243	inode->i_mode \|= S_IFDIR;
	244	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	245	squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
	246	squashfs_i(inode)->dir_idx_cnt = 0;
	247	squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
	248
	249	TRACE("Directory inode %x:%x, start_block %llx, offset %x\n",
	250	SQUASHFS_INODE_BLK(ino), offset,
	251	squashfs_i(inode)->start,
	252	le16_to_cpu(sqsh_ino->offset));
	253	break;
	254	}
	255	case SQUASHFS_LDIR_TYPE: {
	256	struct squashfs_ldir_inode *sqsh_ino = &squashfs_ino.ldir;
	257
	258	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	259	sizeof(*sqsh_ino));
	260	if (err < 0)
	261	goto failed_read;
	262
67f66cc6	263	xattr_id = le32_to_cpu(sqsh_ino->xattr);
bfe86848	264	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	265	inode->i_size = le32_to_cpu(sqsh_ino->file_size);
	266	inode->i_op = &squashfs_dir_inode_ops;
	267	inode->i_fop = &squashfs_dir_ops;
	268	inode->i_mode \|= S_IFDIR;
	269	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	270	squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
	271	squashfs_i(inode)->dir_idx_start = block;
	272	squashfs_i(inode)->dir_idx_offset = offset;
	273	squashfs_i(inode)->dir_idx_cnt = le16_to_cpu(sqsh_ino->i_count);
	274	squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
	275
	276	TRACE("Long directory inode %x:%x, start_block %llx, offset "
	277	"%x\n", SQUASHFS_INODE_BLK(ino), offset,
	278	squashfs_i(inode)->start,
	279	le16_to_cpu(sqsh_ino->offset));
	280	break;
	281	}
	282	case SQUASHFS_SYMLINK_TYPE:
	283	case SQUASHFS_LSYMLINK_TYPE: {
	284	struct squashfs_symlink_inode *sqsh_ino = &squashfs_ino.symlink;
	285
	286	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	287	sizeof(*sqsh_ino));
	288	if (err < 0)
	289	goto failed_read;
	290
bfe86848	291	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246	292	inode->i_size = le32_to_cpu(sqsh_ino->symlink_size);
67f66cc6	293	inode->i_op = &squashfs_symlink_inode_ops;
6545b246 PL	294	inode->i_data.a_ops = &squashfs_symlink_aops;
	295	inode->i_mode \|= S_IFLNK;
	296	squashfs_i(inode)->start = block;
	297	squashfs_i(inode)->offset = offset;
	298
67f66cc6 PL	299	if (type == SQUASHFS_LSYMLINK_TYPE) {
	300	__le32 xattr;
	301
	302	err = squashfs_read_metadata(sb, NULL, &block,
	303	&offset, inode->i_size);
	304	if (err < 0)
	305	goto failed_read;
	306	err = squashfs_read_metadata(sb, &xattr, &block,
	307	&offset, sizeof(xattr));
	308	if (err < 0)
	309	goto failed_read;
	310	xattr_id = le32_to_cpu(xattr);
	311	}
	312
6545b246 PL	313	TRACE("Symbolic link inode %x:%x, start_block %llx, offset "
	314	"%x\n", SQUASHFS_INODE_BLK(ino), offset,
	315	block, offset);
	316	break;
	317	}
	318	case SQUASHFS_BLKDEV_TYPE:
67f66cc6	319	case SQUASHFS_CHRDEV_TYPE: {
6545b246 PL	320	struct squashfs_dev_inode *sqsh_ino = &squashfs_ino.dev;
	321	unsigned int rdev;
	322
	323	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	324	sizeof(*sqsh_ino));
	325	if (err < 0)
	326	goto failed_read;
	327
	328	if (type == SQUASHFS_CHRDEV_TYPE)
	329	inode->i_mode \|= S_IFCHR;
	330	else
	331	inode->i_mode \|= S_IFBLK;
bfe86848	332	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	333	rdev = le32_to_cpu(sqsh_ino->rdev);
	334	init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
	335
	336	TRACE("Device inode %x:%x, rdev %x\n",
	337	SQUASHFS_INODE_BLK(ino), offset, rdev);
	338	break;
	339	}
67f66cc6 PL	340	case SQUASHFS_LBLKDEV_TYPE:
	341	case SQUASHFS_LCHRDEV_TYPE: {
	342	struct squashfs_ldev_inode *sqsh_ino = &squashfs_ino.ldev;
	343	unsigned int rdev;
	344
	345	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	346	sizeof(*sqsh_ino));
	347	if (err < 0)
	348	goto failed_read;
	349
	350	if (type == SQUASHFS_LCHRDEV_TYPE)
	351	inode->i_mode \|= S_IFCHR;
	352	else
	353	inode->i_mode \|= S_IFBLK;
	354	xattr_id = le32_to_cpu(sqsh_ino->xattr);
	355	inode->i_op = &squashfs_inode_ops;
bfe86848	356	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
67f66cc6 PL	357	rdev = le32_to_cpu(sqsh_ino->rdev);
	358	init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
	359
	360	TRACE("Device inode %x:%x, rdev %x\n",
	361	SQUASHFS_INODE_BLK(ino), offset, rdev);
	362	break;
	363	}
6545b246	364	case SQUASHFS_FIFO_TYPE:
67f66cc6	365	case SQUASHFS_SOCKET_TYPE: {
6545b246 PL	366	struct squashfs_ipc_inode *sqsh_ino = &squashfs_ino.ipc;
	367
	368	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	369	sizeof(*sqsh_ino));
	370	if (err < 0)
	371	goto failed_read;
	372
	373	if (type == SQUASHFS_FIFO_TYPE)
	374	inode->i_mode \|= S_IFIFO;
	375	else
	376	inode->i_mode \|= S_IFSOCK;
bfe86848	377	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	378	init_special_inode(inode, inode->i_mode, 0);
	379	break;
	380	}
67f66cc6 PL	381	case SQUASHFS_LFIFO_TYPE:
	382	case SQUASHFS_LSOCKET_TYPE: {
	383	struct squashfs_lipc_inode *sqsh_ino = &squashfs_ino.lipc;
	384
	385	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	386	sizeof(*sqsh_ino));
	387	if (err < 0)
	388	goto failed_read;
	389
	390	if (type == SQUASHFS_LFIFO_TYPE)
	391	inode->i_mode \|= S_IFIFO;
	392	else
	393	inode->i_mode \|= S_IFSOCK;
	394	xattr_id = le32_to_cpu(sqsh_ino->xattr);
	395	inode->i_op = &squashfs_inode_ops;
bfe86848	396	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
67f66cc6 PL	397	init_special_inode(inode, inode->i_mode, 0);
	398	break;
	399	}
6545b246 PL	400	default:
	401	ERROR("Unknown inode type %d in squashfs_iget!\n", type);
	402	return -EINVAL;
	403	}
	404
67f66cc6 PL	405	if (xattr_id != SQUASHFS_INVALID_XATTR && msblk->xattr_id_table) {
	406	err = squashfs_xattr_lookup(sb, xattr_id,
	407	&squashfs_i(inode)->xattr_count,
	408	&squashfs_i(inode)->xattr_size,
	409	&squashfs_i(inode)->xattr);
	410	if (err < 0)
	411	goto failed_read;
	412	inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9)
	413	+ 1;
	414	} else
	415	squashfs_i(inode)->xattr_count = 0;
	416
6545b246 PL	417	return 0;
	418
	419	failed_read:
	420	ERROR("Unable to read inode 0x%llx\n", ino);
	421	return err;
	422	}
67f66cc6 PL	423
	424
	425	const struct inode_operations squashfs_inode_ops = {
	426	.getxattr = generic_getxattr,
	427	.listxattr = squashfs_listxattr
	428	};
	429