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

// 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 <[email protected]>
 *
 * 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;

		inode->i_size = le32_to_cpu(sqsh_ino->symlink_size);
		if (inode->i_size > PAGE_SIZE) {
			ERROR("Corrupted symlink\n");
			return -EINVAL;
		}

		set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
		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
68252eb5	1	// SPDX-License-Identifier: GPL-2.0-or-later
6545b246 PL	2	/*
	3	* Squashfs - a compressed read only filesystem for Linux
	4	*
	5	* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
d7f2ff67	6	* Phillip Lougher <[email protected]>
6545b246	7	*
6545b246 PL	8	* inode.c
	9	*/
	10
	11	/*
	12	* This file implements code to create and read inodes from disk.
	13	*
	14	* Inodes in Squashfs are identified by a 48-bit inode which encodes the
	15	* location of the compressed metadata block containing the inode, and the byte
	16	* offset into that block where the inode is placed (<block, offset>).
	17	*
	18	* To maximise compression there are different inodes for each file type
	19	* (regular file, directory, device, etc.), the inode contents and length
	20	* varying with the type.
	21	*
	22	* To further maximise compression, two types of regular file inode and
	23	* directory inode are defined: inodes optimised for frequently occurring
	24	* regular files and directories, and extended types where extra
	25	* information has to be stored.
	26	*/
	27
	28	#include <linux/fs.h>
	29	#include <linux/vfs.h>
67f66cc6	30	#include <linux/xattr.h>
21fc61c7	31	#include <linux/pagemap.h>
6545b246 PL	32
	33	#include "squashfs_fs.h"
	34	#include "squashfs_fs_sb.h"
	35	#include "squashfs_fs_i.h"
	36	#include "squashfs.h"
01e5b4e4	37	#include "xattr.h"
6545b246 PL	38
	39	/*
	40	* Initialise VFS inode with the base inode information common to all
	41	* Squashfs inode types. Sqsh_ino contains the unswapped base inode
	42	* off disk.
	43	*/
	44	static int squashfs_new_inode(struct super_block sb, struct inode inode,
	45	struct squashfs_base_inode *sqsh_ino)
	46	{
61293ee2 EB	47	uid_t i_uid;
61293ee2 EB	48	gid_t i_gid;
6545b246 PL	49	int err;
6545b246 PL	50
9253c54e PL	51	inode->i_ino = le32_to_cpu(sqsh_ino->inode_number);
	52	if (inode->i_ino == 0)
	53	return -EINVAL;
	54
61293ee2	55	err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->uid), &i_uid);
6545b246 PL	56	if (err)
	57	return err;
	58
61293ee2	59	err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->guid), &i_gid);
6545b246 PL	60	if (err)
	61	return err;
	62
61293ee2 EB	63	i_uid_write(inode, i_uid);
61293ee2 EB	64	i_gid_write(inode, i_gid);
a1f13ed8 JL	65	inode_set_mtime(inode, le32_to_cpu(sqsh_ino->mtime), 0);
	66	inode_set_atime(inode, inode_get_mtime_sec(inode), 0);
	67	inode_set_ctime(inode, inode_get_mtime_sec(inode), 0);
6545b246 PL	68	inode->i_mode = le16_to_cpu(sqsh_ino->mode);
	69	inode->i_size = 0;
	70
	71	return err;
	72	}
	73
	74
	75	struct inode squashfs_iget(struct super_block sb, long long ino,
	76	unsigned int ino_number)
	77	{
	78	struct inode *inode = iget_locked(sb, ino_number);
	79	int err;
	80
	81	TRACE("Entered squashfs_iget\n");
	82
	83	if (!inode)
	84	return ERR_PTR(-ENOMEM);
	85	if (!(inode->i_state & I_NEW))
	86	return inode;
	87
	88	err = squashfs_read_inode(inode, ino);
	89	if (err) {
	90	iget_failed(inode);
	91	return ERR_PTR(err);
	92	}
	93
	94	unlock_new_inode(inode);
	95	return inode;
	96	}
	97
	98
	99	/*
	100	* Initialise VFS inode by reading inode from inode table (compressed
	101	* metadata). The format and amount of data read depends on type.
	102	*/
	103	int squashfs_read_inode(struct inode *inode, long long ino)
	104	{
	105	struct super_block *sb = inode->i_sb;
	106	struct squashfs_sb_info *msblk = sb->s_fs_info;
	107	u64 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
	108	int err, type, offset = SQUASHFS_INODE_OFFSET(ino);
	109	union squashfs_inode squashfs_ino;
	110	struct squashfs_base_inode *sqshb_ino = &squashfs_ino.base;
67f66cc6	111	int xattr_id = SQUASHFS_INVALID_XATTR;
6545b246 PL	112
	113	TRACE("Entered squashfs_read_inode\n");
	114
	115	/*
	116	* Read inode base common to all inode types.
	117	*/
	118	err = squashfs_read_metadata(sb, sqshb_ino, &block,
	119	&offset, sizeof(*sqshb_ino));
	120	if (err < 0)
	121	goto failed_read;
	122
	123	err = squashfs_new_inode(sb, inode, sqshb_ino);
	124	if (err)
	125	goto failed_read;
	126
	127	block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
	128	offset = SQUASHFS_INODE_OFFSET(ino);
	129
	130	type = le16_to_cpu(sqshb_ino->inode_type);
	131	switch (type) {
	132	case SQUASHFS_REG_TYPE: {
f4f8056a RK	133	unsigned int frag_offset, frag;
f4f8056a RK	134	int frag_size;
6545b246 PL	135	u64 frag_blk;
	136	struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg;
	137
	138	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	139	sizeof(*sqsh_ino));
	140	if (err < 0)
	141	goto failed_read;
	142
	143	frag = le32_to_cpu(sqsh_ino->fragment);
	144	if (frag != SQUASHFS_INVALID_FRAG) {
	145	frag_offset = le32_to_cpu(sqsh_ino->offset);
	146	frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
	147	if (frag_size < 0) {
	148	err = frag_size;
	149	goto failed_read;
	150	}
	151	} else {
	152	frag_blk = SQUASHFS_INVALID_BLK;
	153	frag_size = 0;
	154	frag_offset = 0;
	155	}
	156
bfe86848	157	set_nlink(inode, 1);
6545b246 PL	158	inode->i_size = le32_to_cpu(sqsh_ino->file_size);
	159	inode->i_fop = &generic_ro_fops;
	160	inode->i_mode \|= S_IFREG;
	161	inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
	162	squashfs_i(inode)->fragment_block = frag_blk;
	163	squashfs_i(inode)->fragment_size = frag_size;
	164	squashfs_i(inode)->fragment_offset = frag_offset;
	165	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	166	squashfs_i(inode)->block_list_start = block;
	167	squashfs_i(inode)->offset = offset;
	168	inode->i_data.a_ops = &squashfs_aops;
	169
	170	TRACE("File inode %x:%x, start_block %llx, block_list_start "
	171	"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
	172	offset, squashfs_i(inode)->start, block, offset);
	173	break;
	174	}
	175	case SQUASHFS_LREG_TYPE: {
f4f8056a RK	176	unsigned int frag_offset, frag;
f4f8056a RK	177	int frag_size;
6545b246 PL	178	u64 frag_blk;
	179	struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg;
	180
	181	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	182	sizeof(*sqsh_ino));
	183	if (err < 0)
	184	goto failed_read;
	185
	186	frag = le32_to_cpu(sqsh_ino->fragment);
	187	if (frag != SQUASHFS_INVALID_FRAG) {
	188	frag_offset = le32_to_cpu(sqsh_ino->offset);
	189	frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
	190	if (frag_size < 0) {
	191	err = frag_size;
	192	goto failed_read;
	193	}
	194	} else {
	195	frag_blk = SQUASHFS_INVALID_BLK;
	196	frag_size = 0;
	197	frag_offset = 0;
	198	}
	199
67f66cc6	200	xattr_id = le32_to_cpu(sqsh_ino->xattr);
bfe86848	201	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246	202	inode->i_size = le64_to_cpu(sqsh_ino->file_size);
67f66cc6	203	inode->i_op = &squashfs_inode_ops;
6545b246 PL	204	inode->i_fop = &generic_ro_fops;
6545b246 PL	205	inode->i_mode \|= S_IFREG;
3d4a1c80 PL	206	inode->i_blocks = (inode->i_size -
3d4a1c80 PL	207	le64_to_cpu(sqsh_ino->sparse) + 511) >> 9;
6545b246 PL	208
	209	squashfs_i(inode)->fragment_block = frag_blk;
	210	squashfs_i(inode)->fragment_size = frag_size;
	211	squashfs_i(inode)->fragment_offset = frag_offset;
	212	squashfs_i(inode)->start = le64_to_cpu(sqsh_ino->start_block);
	213	squashfs_i(inode)->block_list_start = block;
	214	squashfs_i(inode)->offset = offset;
	215	inode->i_data.a_ops = &squashfs_aops;
	216
	217	TRACE("File inode %x:%x, start_block %llx, block_list_start "
	218	"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
	219	offset, squashfs_i(inode)->start, block, offset);
	220	break;
	221	}
	222	case SQUASHFS_DIR_TYPE: {
	223	struct squashfs_dir_inode *sqsh_ino = &squashfs_ino.dir;
	224
	225	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	226	sizeof(*sqsh_ino));
	227	if (err < 0)
	228	goto failed_read;
	229
bfe86848	230	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	231	inode->i_size = le16_to_cpu(sqsh_ino->file_size);
	232	inode->i_op = &squashfs_dir_inode_ops;
	233	inode->i_fop = &squashfs_dir_ops;
	234	inode->i_mode \|= S_IFDIR;
	235	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	236	squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
	237	squashfs_i(inode)->dir_idx_cnt = 0;
	238	squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
	239
	240	TRACE("Directory inode %x:%x, start_block %llx, offset %x\n",
	241	SQUASHFS_INODE_BLK(ino), offset,
	242	squashfs_i(inode)->start,
	243	le16_to_cpu(sqsh_ino->offset));
	244	break;
	245	}
	246	case SQUASHFS_LDIR_TYPE: {
	247	struct squashfs_ldir_inode *sqsh_ino = &squashfs_ino.ldir;
	248
	249	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	250	sizeof(*sqsh_ino));
	251	if (err < 0)
	252	goto failed_read;
	253
67f66cc6	254	xattr_id = le32_to_cpu(sqsh_ino->xattr);
bfe86848	255	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	256	inode->i_size = le32_to_cpu(sqsh_ino->file_size);
	257	inode->i_op = &squashfs_dir_inode_ops;
	258	inode->i_fop = &squashfs_dir_ops;
	259	inode->i_mode \|= S_IFDIR;
	260	squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
	261	squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
	262	squashfs_i(inode)->dir_idx_start = block;
	263	squashfs_i(inode)->dir_idx_offset = offset;
	264	squashfs_i(inode)->dir_idx_cnt = le16_to_cpu(sqsh_ino->i_count);
	265	squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
	266
	267	TRACE("Long directory inode %x:%x, start_block %llx, offset "
	268	"%x\n", SQUASHFS_INODE_BLK(ino), offset,
	269	squashfs_i(inode)->start,
	270	le16_to_cpu(sqsh_ino->offset));
	271	break;
	272	}
	273	case SQUASHFS_SYMLINK_TYPE:
	274	case SQUASHFS_LSYMLINK_TYPE: {
	275	struct squashfs_symlink_inode *sqsh_ino = &squashfs_ino.symlink;
	276
	277	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	278	sizeof(*sqsh_ino));
	279	if (err < 0)
	280	goto failed_read;
	281
6545b246	282	inode->i_size = le32_to_cpu(sqsh_ino->symlink_size);
810ee43d PL	283	if (inode->i_size > PAGE_SIZE) {
	284	ERROR("Corrupted symlink\n");
	285	return -EINVAL;
	286	}
	287
	288	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
67f66cc6	289	inode->i_op = &squashfs_symlink_inode_ops;
21fc61c7	290	inode_nohighmem(inode);
6545b246 PL	291	inode->i_data.a_ops = &squashfs_symlink_aops;
	292	inode->i_mode \|= S_IFLNK;
	293	squashfs_i(inode)->start = block;
	294	squashfs_i(inode)->offset = offset;
	295
67f66cc6 PL	296	if (type == SQUASHFS_LSYMLINK_TYPE) {
	297	__le32 xattr;
	298
	299	err = squashfs_read_metadata(sb, NULL, &block,
	300	&offset, inode->i_size);
	301	if (err < 0)
	302	goto failed_read;
	303	err = squashfs_read_metadata(sb, &xattr, &block,
	304	&offset, sizeof(xattr));
	305	if (err < 0)
	306	goto failed_read;
	307	xattr_id = le32_to_cpu(xattr);
	308	}
	309
6545b246 PL	310	TRACE("Symbolic link inode %x:%x, start_block %llx, offset "
	311	"%x\n", SQUASHFS_INODE_BLK(ino), offset,
	312	block, offset);
	313	break;
	314	}
	315	case SQUASHFS_BLKDEV_TYPE:
67f66cc6	316	case SQUASHFS_CHRDEV_TYPE: {
6545b246 PL	317	struct squashfs_dev_inode *sqsh_ino = &squashfs_ino.dev;
	318	unsigned int rdev;
	319
	320	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	321	sizeof(*sqsh_ino));
	322	if (err < 0)
	323	goto failed_read;
	324
	325	if (type == SQUASHFS_CHRDEV_TYPE)
	326	inode->i_mode \|= S_IFCHR;
	327	else
	328	inode->i_mode \|= S_IFBLK;
bfe86848	329	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	330	rdev = le32_to_cpu(sqsh_ino->rdev);
	331	init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
	332
	333	TRACE("Device inode %x:%x, rdev %x\n",
	334	SQUASHFS_INODE_BLK(ino), offset, rdev);
	335	break;
	336	}
67f66cc6 PL	337	case SQUASHFS_LBLKDEV_TYPE:
	338	case SQUASHFS_LCHRDEV_TYPE: {
	339	struct squashfs_ldev_inode *sqsh_ino = &squashfs_ino.ldev;
	340	unsigned int rdev;
	341
	342	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	343	sizeof(*sqsh_ino));
	344	if (err < 0)
	345	goto failed_read;
	346
	347	if (type == SQUASHFS_LCHRDEV_TYPE)
	348	inode->i_mode \|= S_IFCHR;
	349	else
	350	inode->i_mode \|= S_IFBLK;
	351	xattr_id = le32_to_cpu(sqsh_ino->xattr);
	352	inode->i_op = &squashfs_inode_ops;
bfe86848	353	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
67f66cc6 PL	354	rdev = le32_to_cpu(sqsh_ino->rdev);
	355	init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
	356
	357	TRACE("Device inode %x:%x, rdev %x\n",
	358	SQUASHFS_INODE_BLK(ino), offset, rdev);
	359	break;
	360	}
6545b246	361	case SQUASHFS_FIFO_TYPE:
67f66cc6	362	case SQUASHFS_SOCKET_TYPE: {
6545b246 PL	363	struct squashfs_ipc_inode *sqsh_ino = &squashfs_ino.ipc;
	364
	365	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	366	sizeof(*sqsh_ino));
	367	if (err < 0)
	368	goto failed_read;
	369
	370	if (type == SQUASHFS_FIFO_TYPE)
	371	inode->i_mode \|= S_IFIFO;
	372	else
	373	inode->i_mode \|= S_IFSOCK;
bfe86848	374	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
6545b246 PL	375	init_special_inode(inode, inode->i_mode, 0);
	376	break;
	377	}
67f66cc6 PL	378	case SQUASHFS_LFIFO_TYPE:
	379	case SQUASHFS_LSOCKET_TYPE: {
	380	struct squashfs_lipc_inode *sqsh_ino = &squashfs_ino.lipc;
	381
	382	err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
	383	sizeof(*sqsh_ino));
	384	if (err < 0)
	385	goto failed_read;
	386
	387	if (type == SQUASHFS_LFIFO_TYPE)
	388	inode->i_mode \|= S_IFIFO;
	389	else
	390	inode->i_mode \|= S_IFSOCK;
	391	xattr_id = le32_to_cpu(sqsh_ino->xattr);
	392	inode->i_op = &squashfs_inode_ops;
bfe86848	393	set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
67f66cc6 PL	394	init_special_inode(inode, inode->i_mode, 0);
	395	break;
	396	}
6545b246 PL	397	default:
	398	ERROR("Unknown inode type %d in squashfs_iget!\n", type);
	399	return -EINVAL;
	400	}
	401
67f66cc6 PL	402	if (xattr_id != SQUASHFS_INVALID_XATTR && msblk->xattr_id_table) {
	403	err = squashfs_xattr_lookup(sb, xattr_id,
	404	&squashfs_i(inode)->xattr_count,
	405	&squashfs_i(inode)->xattr_size,
	406	&squashfs_i(inode)->xattr);
	407	if (err < 0)
	408	goto failed_read;
	409	inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9)
	410	+ 1;
	411	} else
	412	squashfs_i(inode)->xattr_count = 0;
	413
6545b246 PL	414	return 0;
	415
	416	failed_read:
	417	ERROR("Unable to read inode 0x%llx\n", ino);
	418	return err;
	419	}
67f66cc6 PL	420
	421
	422	const struct inode_operations squashfs_inode_ops = {
67f66cc6 PL	423	.listxattr = squashfs_listxattr
	424	};
	425