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)  * block.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 the low-level routines to read and decompress
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * datablocks and metadata blocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/vfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/bio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include "squashfs_fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include "squashfs_fs_sb.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include "squashfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include "decompressor.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include "page_actor.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  * Returns the amount of bytes copied to the page actor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static int copy_bio_to_actor(struct bio *bio,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 			     struct squashfs_page_actor *actor,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 			     int offset, int req_length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	void *actor_addr = squashfs_first_page(actor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct bvec_iter_all iter_all = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	int copied_bytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	int actor_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	if (WARN_ON_ONCE(!bio_next_segment(bio, &iter_all)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	while (copied_bytes < req_length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		int bytes_to_copy = min_t(int, bvec->bv_len - offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 					  PAGE_SIZE - actor_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		bytes_to_copy = min_t(int, bytes_to_copy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 				      req_length - copied_bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		memcpy(actor_addr + actor_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		       page_address(bvec->bv_page) + bvec->bv_offset + offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		       bytes_to_copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		actor_offset += bytes_to_copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		copied_bytes += bytes_to_copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		offset += bytes_to_copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		if (actor_offset >= PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			actor_addr = squashfs_next_page(actor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			if (!actor_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			actor_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		if (offset >= bvec->bv_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 			if (!bio_next_segment(bio, &iter_all))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 			offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	squashfs_finish_page(actor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	return copied_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) static int squashfs_bio_read(struct super_block *sb, u64 index, int length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 			     struct bio **biop, int *block_offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	struct squashfs_sb_info *msblk = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	const u64 read_start = round_down(index, msblk->devblksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	const sector_t block = read_start >> msblk->devblksize_log2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	const u64 read_end = round_up(index + length, msblk->devblksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	const sector_t block_end = read_end >> msblk->devblksize_log2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	int offset = read_start - round_down(index, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	int total_len = (block_end - block) << msblk->devblksize_log2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	const int page_count = DIV_ROUND_UP(total_len + offset, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	int error, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	struct bio *bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	if (page_count <= BIO_MAX_PAGES)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		bio = bio_alloc(GFP_NOIO, page_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		bio = bio_kmalloc(GFP_NOIO, page_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	if (!bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	bio_set_dev(bio, sb->s_bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	bio->bi_opf = READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	bio->bi_iter.bi_sector = block * (msblk->devblksize >> SECTOR_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	for (i = 0; i < page_count; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		unsigned int len =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			min_t(unsigned int, PAGE_SIZE - offset, total_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		struct page *page = alloc_page(GFP_NOIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		if (!page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			goto out_free_bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		if (!bio_add_page(bio, page, len, offset)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			error = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			goto out_free_bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		total_len -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	error = submit_bio_wait(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		goto out_free_bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	*biop = bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	*block_offset = index & ((1 << msblk->devblksize_log2) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) out_free_bio:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	bio_free_pages(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	bio_put(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  * Read and decompress a metadata block or datablock.  Length is non-zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  * if a datablock is being read (the size is stored elsewhere in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  * filesystem), otherwise the length is obtained from the first two bytes of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  * the metadata block.  A bit in the length field indicates if the block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  * is stored uncompressed in the filesystem (usually because compression
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  * generated a larger block - this does occasionally happen with compression
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * algorithms).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) int squashfs_read_data(struct super_block *sb, u64 index, int length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		       u64 *next_index, struct squashfs_page_actor *output)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	struct squashfs_sb_info *msblk = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	struct bio *bio = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	int compressed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	if (length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		 * Datablock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		compressed = SQUASHFS_COMPRESSED_BLOCK(length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		length = SQUASHFS_COMPRESSED_SIZE_BLOCK(length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		TRACE("Block @ 0x%llx, %scompressed size %d, src size %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			index, compressed ? "" : "un", length, output->length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		 * Metadata block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		const u8 *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		struct bvec_iter_all iter_all = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		if (index + 2 > msblk->bytes_used) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 			res = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		res = squashfs_bio_read(sb, index, 2, &bio, &offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		if (res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		if (WARN_ON_ONCE(!bio_next_segment(bio, &iter_all))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			res = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 			goto out_free_bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		/* Extract the length of the metadata block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		data = page_address(bvec->bv_page) + bvec->bv_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		length = data[offset];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		if (offset < bvec->bv_len - 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			length |= data[offset + 1] << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			if (WARN_ON_ONCE(!bio_next_segment(bio, &iter_all))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 				res = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 				goto out_free_bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			data = page_address(bvec->bv_page) + bvec->bv_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 			length |= data[0] << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		bio_free_pages(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		bio_put(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		compressed = SQUASHFS_COMPRESSED(length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		length = SQUASHFS_COMPRESSED_SIZE(length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		index += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		TRACE("Block @ 0x%llx, %scompressed size %d\n", index - 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		      compressed ? "" : "un", length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	if (length < 0 || length > output->length ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			(index + length) > msblk->bytes_used) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		res = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if (next_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		*next_index = index + length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	res = squashfs_bio_read(sb, index, length, &bio, &offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if (compressed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		if (!msblk->stream) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 			res = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 			goto out_free_bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		res = squashfs_decompress(msblk, bio, offset, length, output);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		res = copy_bio_to_actor(bio, output, offset, length);
^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) out_free_bio:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	bio_free_pages(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	bio_put(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	if (res < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		ERROR("Failed to read block 0x%llx: %d\n", index, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }