add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/squashfs/lz4_wrapper.c
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@@ -1,12 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (c) 2013, 2014
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  * Phillip Lougher <phillip@squashfs.org.uk>
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- *
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- * This work is licensed under the terms of the GNU GPL, version 2. See
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- * the COPYING file in the top-level directory.
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  */
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-#include <linux/buffer_head.h>
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+#include <linux/bio.h>
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 #include <linux/mutex.h>
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 #include <linux/slab.h>
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 #include <linux/vmalloc.h>
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@@ -91,20 +89,23 @@
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 static int lz4_uncompress(struct squashfs_sb_info *msblk, void *strm,
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-	struct buffer_head **bh, int b, int offset, int length,
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+	struct bio *bio, int offset, int length,
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 	struct squashfs_page_actor *output)
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 {
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+	struct bvec_iter_all iter_all = {};
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+	struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
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 	struct squashfs_lz4 *stream = strm;
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 	void *buff = stream->input, *data;
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-	int avail, i, bytes = length, res;
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+	int bytes = length, res;
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-	for (i = 0; i < b; i++) {
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-		avail = min(bytes, msblk->devblksize - offset);
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-		memcpy(buff, bh[i]->b_data + offset, avail);
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+	while (bio_next_segment(bio, &iter_all)) {
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+		int avail = min(bytes, ((int)bvec->bv_len) - offset);
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+
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+		data = page_address(bvec->bv_page) + bvec->bv_offset;
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+		memcpy(buff, data + offset, avail);
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 		buff += avail;
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 		bytes -= avail;
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 		offset = 0;
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-		put_bh(bh[i]);
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 	}
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 	res = LZ4_decompress_safe(stream->input, stream->output,