[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;

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