[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 <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;

	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_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
};
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>
21fc61c7	44	#include <linux/pagemap.h>
6545b246 PL	45
	46	#include "squashfs_fs.h"
	47	#include "squashfs_fs_sb.h"
	48	#include "squashfs_fs_i.h"
	49	#include "squashfs.h"
01e5b4e4	50	#include "xattr.h"
6545b246 PL	51
	52	/*
	53	* Initialise VFS inode with the base inode information common to all
	54	* Squashfs inode types. Sqsh_ino contains the unswapped base inode
	55	* off disk.
	56	*/
	57	static int squashfs_new_inode(struct super_block sb, struct inode inode,
	58	struct squashfs_base_inode *sqsh_ino)
	59	{
61293ee2 EB	60	uid_t i_uid;
61293ee2 EB	61	gid_t i_gid;
6545b246 PL	62	int err;
6545b246 PL	63
61293ee2	64	err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->uid), &i_uid);
6545b246 PL	65	if (err)
	66	return err;
	67
61293ee2	68	err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->guid), &i_gid);
6545b246 PL	69	if (err)
	70	return err;
	71
61293ee2 EB	72	i_uid_write(inode, i_uid);
61293ee2 EB	73	i_gid_write(inode, i_gid);
6545b246 PL	74	inode->i_ino = le32_to_cpu(sqsh_ino->inode_number);
	75	inode->i_mtime.tv_sec = le32_to_cpu(sqsh_ino->mtime);
	76	inode->i_atime.tv_sec = inode->i_mtime.tv_sec;
	77	inode->i_ctime.tv_sec = inode->i_mtime.tv_sec;
	78	inode->i_mode = le16_to_cpu(sqsh_ino->mode);
	79	inode->i_size = 0;
	80
	81	return err;
	82	}
	83
	84
	85	struct inode squashfs_iget(struct super_block sb, long long ino,
	86	unsigned int ino_number)
	87	{
	88	struct inode *inode = iget_locked(sb, ino_number);
	89	int err;
	90
	91	TRACE("Entered squashfs_iget\n");
	92
	93	if (!inode)
	94	return ERR_PTR(-ENOMEM);
	95	if (!(inode->i_state & I_NEW))
	96	return inode;
	97
	98	err = squashfs_read_inode(inode, ino);
	99	if (err) {
	100	iget_failed(inode);
	101	return ERR_PTR(err);
	102	}
	103
	104	unlock_new_inode(inode);
	105	return inode;
	106	}
	107
	108
	109	/*
	110	* Initialise VFS inode by reading inode from inode table (compressed
	111	* metadata). The format and amount of data read depends on type.
	112	*/
	113	int squashfs_read_inode(struct inode *inode, long long ino)
	114	{
	115	struct super_block *sb = inode->i_sb;
	116	struct squashfs_sb_info *msblk = sb->s_fs_info;
	117	u64 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
	118	int err, type, offset = SQUASHFS_INODE_OFFSET(ino);
	119	union squashfs_inode squashfs_ino;
	120	struct squashfs_base_inode *sqshb_ino = &squashfs_ino.base;
67f66cc6	121	int xattr_id = SQUASHFS_INVALID_XATTR;
6545b246 PL	122
	123	TRACE("Entered squashfs_read_inode\n");
	124
	125	/*
	126	* Read inode base common to all inode types.
	127	*/
	128	err = squashfs_read_metadata(sb, sqshb_ino, &block,
	129	&offset, sizeof(*sqshb_ino));
	130	if (err < 0)
	131	goto failed_read;
	132
	133	err = squashfs_new_inode(sb, inode, sqshb_ino);
	134	if (err)
	135	goto failed_read;
	136
	137	block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
	138	offset = SQUASHFS_INODE_OFFSET(ino);
	139
	140	type = le16_to_cpu(sqshb_ino->inode_type);
	141	switch (type) {
	142	case SQUASHFS_REG_TYPE: {
f4f8056a RK	143	unsigned int frag_offset, frag;
f4f8056a RK	144	int frag_size;
6545b246 PL	145	u64 frag_blk;
	146	struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg;
	147
	148	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	149	sizeof(*sqsh_ino));
	150	if (err < 0)
	151	goto failed_read;
	152
	153	frag = le32_to_cpu(sqsh_ino->fragment);
	154	if (frag != SQUASHFS_INVALID_FRAG) {
	155	frag_offset = le32_to_cpu(sqsh_ino->offset);
	156	frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
	157	if (frag_size < 0) {
	158	err = frag_size;
	159	goto failed_read;
	160	}
	161	} else {
	162	frag_blk = SQUASHFS_INVALID_BLK;
	163	frag_size = 0;
	164	frag_offset = 0;
	165	}
	166
bfe86848	167	set_nlink(inode, 1);
6545b246 PL	168	inode->i_size = le32_to_cpu(sqsh_ino->file_size);
	169	inode->i_fop = &generic_ro_fops;
	170	inode->i_mode \|= S_IFREG;
	171	inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
	172	squashfs_i(inode)->fragment_block = frag_blk;
	173	squashfs_i(inode)->fragment_size = frag_size;
	174	squashfs_i(inode)->fragment_offset = frag_offset;
	175	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	176	squashfs_i(inode)->block_list_start = block;
	177	squashfs_i(inode)->offset = offset;
	178	inode->i_data.a_ops = &squashfs_aops;
	179
	180	TRACE("File inode %x:%x, start_block %llx, block_list_start "
	181	"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
	182	offset, squashfs_i(inode)->start, block, offset);
	183	break;
	184	}
	185	case SQUASHFS_LREG_TYPE: {
f4f8056a RK	186	unsigned int frag_offset, frag;
f4f8056a RK	187	int frag_size;
6545b246 PL	188	u64 frag_blk;
	189	struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg;
	190
	191	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	192	sizeof(*sqsh_ino));
	193	if (err < 0)
	194	goto failed_read;
	195
	196	frag = le32_to_cpu(sqsh_ino->fragment);
	197	if (frag != SQUASHFS_INVALID_FRAG) {
	198	frag_offset = le32_to_cpu(sqsh_ino->offset);
	199	frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
	200	if (frag_size < 0) {
	201	err = frag_size;
	202	goto failed_read;
	203	}
	204	} else {
	205	frag_blk = SQUASHFS_INVALID_BLK;
	206	frag_size = 0;
	207	frag_offset = 0;
	208	}
	209
67f66cc6	210	xattr_id = le32_to_cpu(sqsh_ino->xattr);
bfe86848	211	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246	212	inode->i_size = le64_to_cpu(sqsh_ino->file_size);
67f66cc6	213	inode->i_op = &squashfs_inode_ops;
6545b246 PL	214	inode->i_fop = &generic_ro_fops;
6545b246 PL	215	inode->i_mode \|= S_IFREG;
3d4a1c80 PL	216	inode->i_blocks = (inode->i_size -
3d4a1c80 PL	217	le64_to_cpu(sqsh_ino->sparse) + 511) >> 9;
6545b246 PL	218
	219	squashfs_i(inode)->fragment_block = frag_blk;
	220	squashfs_i(inode)->fragment_size = frag_size;
	221	squashfs_i(inode)->fragment_offset = frag_offset;
	222	squashfs_i(inode)->start = le64_to_cpu(sqsh_ino->start_block);
	223	squashfs_i(inode)->block_list_start = block;
	224	squashfs_i(inode)->offset = offset;
	225	inode->i_data.a_ops = &squashfs_aops;
	226
	227	TRACE("File inode %x:%x, start_block %llx, block_list_start "
	228	"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
	229	offset, squashfs_i(inode)->start, block, offset);
	230	break;
	231	}
	232	case SQUASHFS_DIR_TYPE: {
	233	struct squashfs_dir_inode *sqsh_ino = &squashfs_ino.dir;
	234
	235	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	236	sizeof(*sqsh_ino));
	237	if (err < 0)
	238	goto failed_read;
	239
bfe86848	240	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	241	inode->i_size = le16_to_cpu(sqsh_ino->file_size);
	242	inode->i_op = &squashfs_dir_inode_ops;
	243	inode->i_fop = &squashfs_dir_ops;
	244	inode->i_mode \|= S_IFDIR;
	245	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	246	squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
	247	squashfs_i(inode)->dir_idx_cnt = 0;
	248	squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
	249
	250	TRACE("Directory inode %x:%x, start_block %llx, offset %x\n",
	251	SQUASHFS_INODE_BLK(ino), offset,
	252	squashfs_i(inode)->start,
	253	le16_to_cpu(sqsh_ino->offset));
	254	break;
	255	}
	256	case SQUASHFS_LDIR_TYPE: {
	257	struct squashfs_ldir_inode *sqsh_ino = &squashfs_ino.ldir;
	258
	259	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	260	sizeof(*sqsh_ino));
	261	if (err < 0)
	262	goto failed_read;
	263
67f66cc6	264	xattr_id = le32_to_cpu(sqsh_ino->xattr);
bfe86848	265	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	266	inode->i_size = le32_to_cpu(sqsh_ino->file_size);
	267	inode->i_op = &squashfs_dir_inode_ops;
	268	inode->i_fop = &squashfs_dir_ops;
	269	inode->i_mode \|= S_IFDIR;
	270	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	271	squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
	272	squashfs_i(inode)->dir_idx_start = block;
	273	squashfs_i(inode)->dir_idx_offset = offset;
	274	squashfs_i(inode)->dir_idx_cnt = le16_to_cpu(sqsh_ino->i_count);
	275	squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
	276
	277	TRACE("Long directory inode %x:%x, start_block %llx, offset "
	278	"%x\n", SQUASHFS_INODE_BLK(ino), offset,
	279	squashfs_i(inode)->start,
	280	le16_to_cpu(sqsh_ino->offset));
	281	break;
	282	}
	283	case SQUASHFS_SYMLINK_TYPE:
	284	case SQUASHFS_LSYMLINK_TYPE: {
	285	struct squashfs_symlink_inode *sqsh_ino = &squashfs_ino.symlink;
	286
	287	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	288	sizeof(*sqsh_ino));
	289	if (err < 0)
	290	goto failed_read;
	291
bfe86848	292	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246	293	inode->i_size = le32_to_cpu(sqsh_ino->symlink_size);
67f66cc6	294	inode->i_op = &squashfs_symlink_inode_ops;
21fc61c7	295	inode_nohighmem(inode);
6545b246 PL	296	inode->i_data.a_ops = &squashfs_symlink_aops;
	297	inode->i_mode \|= S_IFLNK;
	298	squashfs_i(inode)->start = block;
	299	squashfs_i(inode)->offset = offset;
	300
67f66cc6 PL	301	if (type == SQUASHFS_LSYMLINK_TYPE) {
	302	__le32 xattr;
	303
	304	err = squashfs_read_metadata(sb, NULL, &block,
	305	&offset, inode->i_size);
	306	if (err < 0)
	307	goto failed_read;
	308	err = squashfs_read_metadata(sb, &xattr, &block,
	309	&offset, sizeof(xattr));
	310	if (err < 0)
	311	goto failed_read;
	312	xattr_id = le32_to_cpu(xattr);
	313	}
	314
6545b246 PL	315	TRACE("Symbolic link inode %x:%x, start_block %llx, offset "
	316	"%x\n", SQUASHFS_INODE_BLK(ino), offset,
	317	block, offset);
	318	break;
	319	}
	320	case SQUASHFS_BLKDEV_TYPE:
67f66cc6	321	case SQUASHFS_CHRDEV_TYPE: {
6545b246 PL	322	struct squashfs_dev_inode *sqsh_ino = &squashfs_ino.dev;
	323	unsigned int rdev;
	324
	325	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	326	sizeof(*sqsh_ino));
	327	if (err < 0)
	328	goto failed_read;
	329
	330	if (type == SQUASHFS_CHRDEV_TYPE)
	331	inode->i_mode \|= S_IFCHR;
	332	else
	333	inode->i_mode \|= S_IFBLK;
bfe86848	334	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	335	rdev = le32_to_cpu(sqsh_ino->rdev);
	336	init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
	337
	338	TRACE("Device inode %x:%x, rdev %x\n",
	339	SQUASHFS_INODE_BLK(ino), offset, rdev);
	340	break;
	341	}
67f66cc6 PL	342	case SQUASHFS_LBLKDEV_TYPE:
	343	case SQUASHFS_LCHRDEV_TYPE: {
	344	struct squashfs_ldev_inode *sqsh_ino = &squashfs_ino.ldev;
	345	unsigned int rdev;
	346
	347	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	348	sizeof(*sqsh_ino));
	349	if (err < 0)
	350	goto failed_read;
	351
	352	if (type == SQUASHFS_LCHRDEV_TYPE)
	353	inode->i_mode \|= S_IFCHR;
	354	else
	355	inode->i_mode \|= S_IFBLK;
	356	xattr_id = le32_to_cpu(sqsh_ino->xattr);
	357	inode->i_op = &squashfs_inode_ops;
bfe86848	358	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
67f66cc6 PL	359	rdev = le32_to_cpu(sqsh_ino->rdev);
	360	init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
	361
	362	TRACE("Device inode %x:%x, rdev %x\n",
	363	SQUASHFS_INODE_BLK(ino), offset, rdev);
	364	break;
	365	}
6545b246	366	case SQUASHFS_FIFO_TYPE:
67f66cc6	367	case SQUASHFS_SOCKET_TYPE: {
6545b246 PL	368	struct squashfs_ipc_inode *sqsh_ino = &squashfs_ino.ipc;
	369
	370	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	371	sizeof(*sqsh_ino));
	372	if (err < 0)
	373	goto failed_read;
	374
	375	if (type == SQUASHFS_FIFO_TYPE)
	376	inode->i_mode \|= S_IFIFO;
	377	else
	378	inode->i_mode \|= S_IFSOCK;
bfe86848	379	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	380	init_special_inode(inode, inode->i_mode, 0);
	381	break;
	382	}
67f66cc6 PL	383	case SQUASHFS_LFIFO_TYPE:
	384	case SQUASHFS_LSOCKET_TYPE: {
	385	struct squashfs_lipc_inode *sqsh_ino = &squashfs_ino.lipc;
	386
	387	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	388	sizeof(*sqsh_ino));
	389	if (err < 0)
	390	goto failed_read;
	391
	392	if (type == SQUASHFS_LFIFO_TYPE)
	393	inode->i_mode \|= S_IFIFO;
	394	else
	395	inode->i_mode \|= S_IFSOCK;
	396	xattr_id = le32_to_cpu(sqsh_ino->xattr);
	397	inode->i_op = &squashfs_inode_ops;
bfe86848	398	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
67f66cc6 PL	399	init_special_inode(inode, inode->i_mode, 0);
	400	break;
	401	}
6545b246 PL	402	default:
	403	ERROR("Unknown inode type %d in squashfs_iget!\n", type);
	404	return -EINVAL;
	405	}
	406
67f66cc6 PL	407	if (xattr_id != SQUASHFS_INVALID_XATTR && msblk->xattr_id_table) {
	408	err = squashfs_xattr_lookup(sb, xattr_id,
	409	&squashfs_i(inode)->xattr_count,
	410	&squashfs_i(inode)->xattr_size,
	411	&squashfs_i(inode)->xattr);
	412	if (err < 0)
	413	goto failed_read;
	414	inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9)
	415	+ 1;
	416	} else
	417	squashfs_i(inode)->xattr_count = 0;
	418
6545b246 PL	419	return 0;
	420
	421	failed_read:
	422	ERROR("Unable to read inode 0x%llx\n", ino);
	423	return err;
	424	}
67f66cc6 PL	425
	426
	427	const struct inode_operations squashfs_inode_ops = {
67f66cc6 PL	428	.listxattr = squashfs_listxattr
	429	};
	430