VisionFive2 Linux kernel

68252eb5f8413 (Thomas Gleixner 2019-05-20 19:08:00 +0200   1) // SPDX-License-Identifier: GPL-2.0-or-later
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000   2) /*
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000   3)  * Squashfs - a compressed read only filesystem for Linux
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000   4)  *
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000   5)  * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
d7f2ff6718efa (Phillip Lougher 2011-05-26 10:39:56 +0100   6)  * Phillip Lougher <phillip@squashfs.org.uk>
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000   7)  *
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000   8)  * namei.c
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000   9)  */
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  10) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  11) /*
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  12)  * This file implements code to do filename lookup in directories.
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  13)  *
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  14)  * Like inodes, directories are packed into compressed metadata blocks, stored
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  15)  * in a directory table.  Directories are accessed using the start address of
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  16)  * the metablock containing the directory and the offset into the
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  17)  * decompressed block (<block, offset>).
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  18)  *
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  19)  * Directories are organised in a slightly complex way, and are not simply
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  20)  * a list of file names.  The organisation takes advantage of the
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  21)  * fact that (in most cases) the inodes of the files will be in the same
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  22)  * compressed metadata block, and therefore, can share the start block.
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  23)  * Directories are therefore organised in a two level list, a directory
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  24)  * header containing the shared start block value, and a sequence of directory
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  25)  * entries, each of which share the shared start block.  A new directory header
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  26)  * is written once/if the inode start block changes.  The directory
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  27)  * header/directory entry list is repeated as many times as necessary.
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  28)  *
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  29)  * Directories are sorted, and can contain a directory index to speed up
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  30)  * file lookup.  Directory indexes store one entry per metablock, each entry
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  31)  * storing the index/filename mapping to the first directory header
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  32)  * in each metadata block.  Directories are sorted in alphabetical order,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  33)  * and at lookup the index is scanned linearly looking for the first filename
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  34)  * alphabetically larger than the filename being looked up.  At this point the
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  35)  * location of the metadata block the filename is in has been found.
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  36)  * The general idea of the index is ensure only one metadata block needs to be
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  37)  * decompressed to do a lookup irrespective of the length of the directory.
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  38)  * This scheme has the advantage that it doesn't require extra memory overhead
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  39)  * and doesn't require much extra storage on disk.
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  40)  */
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  41) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  42) #include <linux/fs.h>
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  43) #include <linux/vfs.h>
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  44) #include <linux/slab.h>
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  45) #include <linux/string.h>
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  46) #include <linux/dcache.h>
67f66cc6c728d (Phillip Lougher 2010-05-17 04:06:56 +0100  47) #include <linux/xattr.h>
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  48) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  49) #include "squashfs_fs.h"
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  50) #include "squashfs_fs_sb.h"
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  51) #include "squashfs_fs_i.h"
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  52) #include "squashfs.h"
01e5b4e4e897f (Phillip Lougher 2010-05-17 19:39:02 +0100  53) #include "xattr.h"
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  54) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  55) /*
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  56)  * Lookup name in the directory index, returning the location of the metadata
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  57)  * block containing it, and the directory index this represents.
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  58)  *
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  59)  * If we get an error reading the index then return the part of the index
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  60)  * (if any) we have managed to read - the index isn't essential, just
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  61)  * quicker.
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  62)  */
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  63) static int get_dir_index_using_name(struct super_block *sb,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  64) 			u64 *next_block, int *next_offset, u64 index_start,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  65) 			int index_offset, int i_count, const char *name,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  66) 			int len)
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  67) {
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  68) 	struct squashfs_sb_info *msblk = sb->s_fs_info;
28d7b5684ba98 (Dan Carpenter   2013-07-17 15:20:25 +0300  69) 	int i, length = 0, err;
28d7b5684ba98 (Dan Carpenter   2013-07-17 15:20:25 +0300  70) 	unsigned int size;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  71) 	struct squashfs_dir_index *index;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  72) 	char *str;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  73) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  74) 	TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  75) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  76) 	index = kmalloc(sizeof(*index) + SQUASHFS_NAME_LEN * 2 + 2, GFP_KERNEL);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  77) 	if (index == NULL) {
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  78) 		ERROR("Failed to allocate squashfs_dir_index\n");
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  79) 		goto out;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  80) 	}
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  81) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  82) 	str = &index->name[SQUASHFS_NAME_LEN + 1];
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  83) 	strncpy(str, name, len);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  84) 	str[len] = '\0';
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  85) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  86) 	for (i = 0; i < i_count; i++) {
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  87) 		err = squashfs_read_metadata(sb, index, &index_start,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  88) 					&index_offset, sizeof(*index));
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  89) 		if (err < 0)
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  90) 			break;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  91) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  92) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  93) 		size = le32_to_cpu(index->size) + 1;
9dbc41d5d371c (Phillip Lougher 2013-09-03 04:02:53 +0100  94) 		if (size > SQUASHFS_NAME_LEN)
28d7b5684ba98 (Dan Carpenter   2013-07-17 15:20:25 +0300  95) 			break;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  96) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  97) 		err = squashfs_read_metadata(sb, index->name, &index_start,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  98) 					&index_offset, size);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000  99) 		if (err < 0)
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 100) 			break;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 101) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 102) 		index->name[size] = '\0';
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 103) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 104) 		if (strcmp(index->name, str) > 0)
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 105) 			break;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 106) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 107) 		length = le32_to_cpu(index->index);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 108) 		*next_block = le32_to_cpu(index->start_block) +
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 109) 					msblk->directory_table;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 110) 	}
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 111) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 112) 	*next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 113) 	kfree(index);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 114) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 115) out:
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 116) 	/*
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 117) 	 * Return index (f_pos) of the looked up metadata block.  Translate
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 118) 	 * from internal f_pos to external f_pos which is offset by 3 because
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 119) 	 * we invent "." and ".." entries which are not actually stored in the
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 120) 	 * directory.
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 121) 	 */
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 122) 	return length + 3;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 123) }
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 124) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 125) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 126) static struct dentry *squashfs_lookup(struct inode *dir, struct dentry *dentry,
00cd8dd3bf95f (Al Viro         2012-06-10 17:13:09 -0400 127) 				 unsigned int flags)
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 128) {
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 129) 	const unsigned char *name = dentry->d_name.name;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 130) 	int len = dentry->d_name.len;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 131) 	struct inode *inode = NULL;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 132) 	struct squashfs_sb_info *msblk = dir->i_sb->s_fs_info;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 133) 	struct squashfs_dir_header dirh;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 134) 	struct squashfs_dir_entry *dire;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 135) 	u64 block = squashfs_i(dir)->start + msblk->directory_table;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 136) 	int offset = squashfs_i(dir)->offset;
52e9ce1c0f206 (Phillip Lougher 2013-09-03 04:21:52 +0100 137) 	int err, length;
52e9ce1c0f206 (Phillip Lougher 2013-09-03 04:21:52 +0100 138) 	unsigned int dir_count, size;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 139) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 140) 	TRACE("Entered squashfs_lookup [%llx:%x]\n", block, offset);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 141) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 142) 	dire = kmalloc(sizeof(*dire) + SQUASHFS_NAME_LEN + 1, GFP_KERNEL);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 143) 	if (dire == NULL) {
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 144) 		ERROR("Failed to allocate squashfs_dir_entry\n");
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 145) 		return ERR_PTR(-ENOMEM);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 146) 	}
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 147) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 148) 	if (len > SQUASHFS_NAME_LEN) {
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 149) 		err = -ENAMETOOLONG;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 150) 		goto failed;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 151) 	}
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 152) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 153) 	length = get_dir_index_using_name(dir->i_sb, &block, &offset,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 154) 				squashfs_i(dir)->dir_idx_start,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 155) 				squashfs_i(dir)->dir_idx_offset,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 156) 				squashfs_i(dir)->dir_idx_cnt, name, len);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 157) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 158) 	while (length < i_size_read(dir)) {
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 159) 		/*
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 160) 		 * Read directory header.
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 161) 		 */
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 162) 		err = squashfs_read_metadata(dir->i_sb, &dirh, &block,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 163) 				&offset, sizeof(dirh));
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 164) 		if (err < 0)
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 165) 			goto read_failure;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 166) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 167) 		length += sizeof(dirh);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 168) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 169) 		dir_count = le32_to_cpu(dirh.count) + 1;
44cff8a9ee8a9 (Phillip Lougher 2011-03-15 22:09:55 +0000 170) 
4826d83d9c4f6 (Ajeet Yadav     2012-02-02 13:04:49 +0530 171) 		if (dir_count > SQUASHFS_DIR_COUNT)
44cff8a9ee8a9 (Phillip Lougher 2011-03-15 22:09:55 +0000 172) 			goto data_error;
44cff8a9ee8a9 (Phillip Lougher 2011-03-15 22:09:55 +0000 173) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 174) 		while (dir_count--) {
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 175) 			/*
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 176) 			 * Read directory entry.
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 177) 			 */
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 178) 			err = squashfs_read_metadata(dir->i_sb, dire, &block,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 179) 					&offset, sizeof(*dire));
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 180) 			if (err < 0)
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 181) 				goto read_failure;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 182) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 183) 			size = le16_to_cpu(dire->size) + 1;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 184) 
44cff8a9ee8a9 (Phillip Lougher 2011-03-15 22:09:55 +0000 185) 			/* size should never be larger than SQUASHFS_NAME_LEN */
44cff8a9ee8a9 (Phillip Lougher 2011-03-15 22:09:55 +0000 186) 			if (size > SQUASHFS_NAME_LEN)
44cff8a9ee8a9 (Phillip Lougher 2011-03-15 22:09:55 +0000 187) 				goto data_error;
44cff8a9ee8a9 (Phillip Lougher 2011-03-15 22:09:55 +0000 188) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 189) 			err = squashfs_read_metadata(dir->i_sb, dire->name,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 190) 					&block, &offset, size);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 191) 			if (err < 0)
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 192) 				goto read_failure;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 193) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 194) 			length += sizeof(*dire) + size;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 195) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 196) 			if (name[0] < dire->name[0])
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 197) 				goto exit_lookup;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 198) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 199) 			if (len == size && !strncmp(name, dire->name, len)) {
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 200) 				unsigned int blk, off, ino_num;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 201) 				long long ino;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 202) 				blk = le32_to_cpu(dirh.start_block);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 203) 				off = le16_to_cpu(dire->offset);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 204) 				ino_num = le32_to_cpu(dirh.inode_number) +
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 205) 					(short) le16_to_cpu(dire->inode_number);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 206) 				ino = SQUASHFS_MKINODE(blk, off);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 207) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 208) 				TRACE("calling squashfs_iget for directory "
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 209) 					"entry %s, inode  %x:%x, %d\n", name,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 210) 					blk, off, ino_num);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 211) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 212) 				inode = squashfs_iget(dir->i_sb, ino, ino_num);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 213) 				goto exit_lookup;
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 214) 			}
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 215) 		}
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 216) 	}
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 217) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 218) exit_lookup:
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 219) 	kfree(dire);
0c1aa9a952c36 (Al Viro         2011-07-08 20:57:47 -0400 220) 	return d_splice_alias(inode, dentry);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 221) 
44cff8a9ee8a9 (Phillip Lougher 2011-03-15 22:09:55 +0000 222) data_error:
44cff8a9ee8a9 (Phillip Lougher 2011-03-15 22:09:55 +0000 223) 	err = -EIO;
44cff8a9ee8a9 (Phillip Lougher 2011-03-15 22:09:55 +0000 224) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 225) read_failure:
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 226) 	ERROR("Unable to read directory block [%llx:%x]\n",
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 227) 		squashfs_i(dir)->start + msblk->directory_table,
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 228) 		squashfs_i(dir)->offset);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 229) failed:
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 230) 	kfree(dire);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 231) 	return ERR_PTR(err);
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 232) }
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 233) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 234) 
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 235) const struct inode_operations squashfs_dir_inode_ops = {
67f66cc6c728d (Phillip Lougher 2010-05-17 04:06:56 +0100 236) 	.lookup = squashfs_lookup,
67f66cc6c728d (Phillip Lougher 2010-05-17 04:06:56 +0100 237) 	.listxattr = squashfs_listxattr
c88da2c979369 (Phillip Lougher 2009-01-05 08:46:23 +0000 238) };