Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Squashfs - a compressed read only filesystem for Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Phillip Lougher <phillip@squashfs.org.uk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * super.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * This file implements code to read the superblock, read and initialise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * in-memory structures at mount time, and all the VFS glue code to register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  * the filesystem.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/fs_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/vfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/magic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include "squashfs_fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include "squashfs_fs_sb.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include "squashfs_fs_i.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include "squashfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include "decompressor.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include "xattr.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static struct file_system_type squashfs_fs_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static const struct super_operations squashfs_super_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) static const struct squashfs_decompressor *supported_squashfs_filesystem(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct fs_context *fc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	short major, short minor, short id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	const struct squashfs_decompressor *decompressor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	if (major < SQUASHFS_MAJOR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		errorf(fc, "Major/Minor mismatch, older Squashfs %d.%d "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		       "filesystems are unsupported", major, minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	} else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		errorf(fc, "Major/Minor mismatch, trying to mount newer "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		       "%d.%d filesystem", major, minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		errorf(fc, "Please update your kernel");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	decompressor = squashfs_lookup_decompressor(id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if (!decompressor->supported) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		errorf(fc, "Filesystem uses \"%s\" compression. This is not supported",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		       decompressor->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	return decompressor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	struct squashfs_sb_info *msblk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	struct squashfs_super_block *sblk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct inode *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	long long root_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	unsigned short flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	unsigned int fragments;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	u64 lookup_table_start, xattr_id_table_start, next_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	TRACE("Entered squashfs_fill_superblock\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	sb->s_fs_info = kzalloc(sizeof(*msblk), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (sb->s_fs_info == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		ERROR("Failed to allocate squashfs_sb_info\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	msblk = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	msblk->devblksize_log2 = ffz(~msblk->devblksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	mutex_init(&msblk->meta_index_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	 * msblk->bytes_used is checked in squashfs_read_table to ensure reads
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	 * are not beyond filesystem end.  But as we're using
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	 * squashfs_read_table here to read the superblock (including the value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	 * of bytes_used) we need to set it to an initial sensible dummy value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	msblk->bytes_used = sizeof(*sblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	sblk = squashfs_read_table(sb, SQUASHFS_START, sizeof(*sblk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (IS_ERR(sblk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		errorf(fc, "unable to read squashfs_super_block");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		err = PTR_ERR(sblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		sblk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	/* Check it is a SQUASHFS superblock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	sb->s_magic = le32_to_cpu(sblk->s_magic);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (sb->s_magic != SQUASHFS_MAGIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		if (!(fc->sb_flags & SB_SILENT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			errorf(fc, "Can't find a SQUASHFS superblock on %pg",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 			       sb->s_bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	/* Check the MAJOR & MINOR versions and lookup compression type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	msblk->decompressor = supported_squashfs_filesystem(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 			fc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			le16_to_cpu(sblk->s_major),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 			le16_to_cpu(sblk->s_minor),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			le16_to_cpu(sblk->compression));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if (msblk->decompressor == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	/* Check the filesystem does not extend beyond the end of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	   block device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	msblk->bytes_used = le64_to_cpu(sblk->bytes_used);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if (msblk->bytes_used < 0 || msblk->bytes_used >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			i_size_read(sb->s_bdev->bd_inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	/* Check block size for sanity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	msblk->block_size = le32_to_cpu(sblk->block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		goto insanity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	 * Check the system page size is not larger than the filesystem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	 * block size (by default 128K).  This is currently not supported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (PAGE_SIZE > msblk->block_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		errorf(fc, "Page size > filesystem block size (%d).  This is "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		       "currently not supported!", msblk->block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	/* Check block log for sanity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	msblk->block_log = le16_to_cpu(sblk->block_log);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	if (msblk->block_log > SQUASHFS_FILE_MAX_LOG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	/* Check that block_size and block_log match */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (msblk->block_size != (1 << msblk->block_log))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		goto insanity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	/* Check the root inode for sanity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	root_inode = le64_to_cpu(sblk->root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (SQUASHFS_INODE_OFFSET(root_inode) > SQUASHFS_METADATA_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		goto insanity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	msblk->inode_table = le64_to_cpu(sblk->inode_table_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	msblk->directory_table = le64_to_cpu(sblk->directory_table_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	msblk->inodes = le32_to_cpu(sblk->inodes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	msblk->fragments = le32_to_cpu(sblk->fragments);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	msblk->ids = le16_to_cpu(sblk->no_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	flags = le16_to_cpu(sblk->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	TRACE("Found valid superblock on %pg\n", sb->s_bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 				? "un" : "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 				? "un" : "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	TRACE("Filesystem size %lld bytes\n", msblk->bytes_used);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	TRACE("Block size %d\n", msblk->block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	TRACE("Number of inodes %d\n", msblk->inodes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	TRACE("Number of fragments %d\n", msblk->fragments);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	TRACE("Number of ids %d\n", msblk->ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	TRACE("sblk->inode_table_start %llx\n", msblk->inode_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	TRACE("sblk->directory_table_start %llx\n", msblk->directory_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	TRACE("sblk->fragment_table_start %llx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		(u64) le64_to_cpu(sblk->fragment_table_start));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	TRACE("sblk->id_table_start %llx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		(u64) le64_to_cpu(sblk->id_table_start));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	sb->s_maxbytes = MAX_LFS_FILESIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	sb->s_time_min = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	sb->s_time_max = U32_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	sb->s_flags |= SB_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	sb->s_op = &squashfs_super_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	msblk->block_cache = squashfs_cache_init("metadata",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	if (msblk->block_cache == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	/* Allocate read_page block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	msblk->read_page = squashfs_cache_init("data",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		squashfs_max_decompressors(), msblk->block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	if (msblk->read_page == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		errorf(fc, "Failed to allocate read_page block");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	msblk->stream = squashfs_decompressor_setup(sb, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (IS_ERR(msblk->stream)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		err = PTR_ERR(msblk->stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		msblk->stream = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		goto insanity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	/* Handle xattrs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	sb->s_xattr = squashfs_xattr_handlers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	xattr_id_table_start = le64_to_cpu(sblk->xattr_id_table_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (xattr_id_table_start == SQUASHFS_INVALID_BLK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		next_table = msblk->bytes_used;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		goto allocate_id_index_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	/* Allocate and read xattr id lookup table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	msblk->xattr_id_table = squashfs_read_xattr_id_table(sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		xattr_id_table_start, &msblk->xattr_table, &msblk->xattr_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (IS_ERR(msblk->xattr_id_table)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		errorf(fc, "unable to read xattr id index table");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		err = PTR_ERR(msblk->xattr_id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		msblk->xattr_id_table = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		if (err != -ENOTSUPP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	next_table = msblk->xattr_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) allocate_id_index_table:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	/* Allocate and read id index table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	msblk->id_table = squashfs_read_id_index_table(sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		le64_to_cpu(sblk->id_table_start), next_table, msblk->ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (IS_ERR(msblk->id_table)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		errorf(fc, "unable to read id index table");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		err = PTR_ERR(msblk->id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		msblk->id_table = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	next_table = le64_to_cpu(msblk->id_table[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	/* Handle inode lookup table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	lookup_table_start = le64_to_cpu(sblk->lookup_table_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (lookup_table_start == SQUASHFS_INVALID_BLK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		goto handle_fragments;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	/* Allocate and read inode lookup table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		lookup_table_start, next_table, msblk->inodes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	if (IS_ERR(msblk->inode_lookup_table)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		errorf(fc, "unable to read inode lookup table");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		err = PTR_ERR(msblk->inode_lookup_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		msblk->inode_lookup_table = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	next_table = le64_to_cpu(msblk->inode_lookup_table[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	sb->s_export_op = &squashfs_export_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) handle_fragments:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	fragments = msblk->fragments;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if (fragments == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		goto check_directory_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	msblk->fragment_cache = squashfs_cache_init("fragment",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		SQUASHFS_CACHED_FRAGMENTS, msblk->block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	if (msblk->fragment_cache == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	/* Allocate and read fragment index table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	msblk->fragment_index = squashfs_read_fragment_index_table(sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		le64_to_cpu(sblk->fragment_table_start), next_table, fragments);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (IS_ERR(msblk->fragment_index)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		errorf(fc, "unable to read fragment index table");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		err = PTR_ERR(msblk->fragment_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		msblk->fragment_index = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	next_table = le64_to_cpu(msblk->fragment_index[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) check_directory_table:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	/* Sanity check directory_table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (msblk->directory_table > next_table) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		goto insanity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	/* Sanity check inode_table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	if (msblk->inode_table >= msblk->directory_table) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		goto insanity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	/* allocate root */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	root = new_inode(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	if (!root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	err = squashfs_read_inode(root, root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		make_bad_inode(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		iput(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	insert_inode_hash(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	sb->s_root = d_make_root(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	if (sb->s_root == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		ERROR("Root inode create failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		goto failed_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	TRACE("Leaving squashfs_fill_super\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	kfree(sblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) insanity:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	errorf(fc, "squashfs image failed sanity check");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) failed_mount:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	squashfs_cache_delete(msblk->block_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	squashfs_cache_delete(msblk->fragment_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	squashfs_cache_delete(msblk->read_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	squashfs_decompressor_destroy(msblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	kfree(msblk->inode_lookup_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	kfree(msblk->fragment_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	kfree(msblk->id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	kfree(msblk->xattr_id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	kfree(sb->s_fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	sb->s_fs_info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	kfree(sblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) static int squashfs_get_tree(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	return get_tree_bdev(fc, squashfs_fill_super);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) static int squashfs_reconfigure(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	sync_filesystem(fc->root->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	fc->sb_flags |= SB_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) static const struct fs_context_operations squashfs_context_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	.get_tree	= squashfs_get_tree,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	.reconfigure	= squashfs_reconfigure,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static int squashfs_init_fs_context(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	fc->ops = &squashfs_context_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	u64 id = huge_encode_dev(dentry->d_sb->s_bdev->bd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	TRACE("Entered squashfs_statfs\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	buf->f_type = SQUASHFS_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	buf->f_bsize = msblk->block_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	buf->f_blocks = ((msblk->bytes_used - 1) >> msblk->block_log) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	buf->f_bfree = buf->f_bavail = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	buf->f_files = msblk->inodes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	buf->f_ffree = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	buf->f_namelen = SQUASHFS_NAME_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	buf->f_fsid = u64_to_fsid(id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) static void squashfs_put_super(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	if (sb->s_fs_info) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 		struct squashfs_sb_info *sbi = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 		squashfs_cache_delete(sbi->block_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		squashfs_cache_delete(sbi->fragment_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		squashfs_cache_delete(sbi->read_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 		squashfs_decompressor_destroy(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 		kfree(sbi->id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 		kfree(sbi->fragment_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 		kfree(sbi->meta_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 		kfree(sbi->inode_lookup_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 		kfree(sbi->xattr_id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 		kfree(sb->s_fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		sb->s_fs_info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) static struct kmem_cache *squashfs_inode_cachep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) static void init_once(void *foo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	struct squashfs_inode_info *ei = foo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	inode_init_once(&ei->vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) static int __init init_inodecache(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 		sizeof(struct squashfs_inode_info), 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 		SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		init_once);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	return squashfs_inode_cachep ? 0 : -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) static void destroy_inodecache(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	 * Make sure all delayed rcu free inodes are flushed before we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	 * destroy cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	rcu_barrier();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	kmem_cache_destroy(squashfs_inode_cachep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) static int __init init_squashfs_fs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	int err = init_inodecache();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	err = register_filesystem(&squashfs_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 		destroy_inodecache();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 	pr_info("version 4.0 (2009/01/31) Phillip Lougher\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) static void __exit exit_squashfs_fs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 	unregister_filesystem(&squashfs_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 	destroy_inodecache();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) static struct inode *squashfs_alloc_inode(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 	struct squashfs_inode_info *ei =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 		kmem_cache_alloc(squashfs_inode_cachep, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 	return ei ? &ei->vfs_inode : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) static void squashfs_free_inode(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) 	kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) static struct file_system_type squashfs_fs_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 	.owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	.name = "squashfs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 	.init_fs_context = squashfs_init_fs_context,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 	.kill_sb = kill_block_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 	.fs_flags = FS_REQUIRES_DEV
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) MODULE_ALIAS_FS("squashfs");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) static const struct super_operations squashfs_super_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) 	.alloc_inode = squashfs_alloc_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) 	.free_inode = squashfs_free_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) 	.statfs = squashfs_statfs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) 	.put_super = squashfs_put_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) module_init(init_squashfs_fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) module_exit(exit_squashfs_fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) MODULE_DESCRIPTION("squashfs 4.0, a compressed read-only filesystem");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) MODULE_AUTHOR("Phillip Lougher <phillip@squashfs.org.uk>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);