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84 lines
1.7 KiB
84 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2013 |
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* Phillip Lougher <[email protected]> |
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*/ |
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#include <linux/types.h> |
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#include <linux/mutex.h> |
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#include <linux/slab.h> |
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#include <linux/bio.h> |
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#include "squashfs_fs.h" |
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#include "squashfs_fs_sb.h" |
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#include "decompressor.h" |
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#include "squashfs.h" |
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/* |
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* This file implements single-threaded decompression in the |
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* decompressor framework |
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*/ |
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struct squashfs_stream { |
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void *stream; |
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struct mutex mutex; |
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}; |
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void *squashfs_decompressor_create(struct squashfs_sb_info *msblk, |
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void *comp_opts) |
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{ |
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struct squashfs_stream *stream; |
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int err = -ENOMEM; |
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stream = kmalloc(sizeof(*stream), GFP_KERNEL); |
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if (stream == NULL) |
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goto out; |
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stream->stream = msblk->decompressor->init(msblk, comp_opts); |
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if (IS_ERR(stream->stream)) { |
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err = PTR_ERR(stream->stream); |
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goto out; |
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} |
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kfree(comp_opts); |
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mutex_init(&stream->mutex); |
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return stream; |
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out: |
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kfree(stream); |
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return ERR_PTR(err); |
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} |
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void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk) |
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{ |
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struct squashfs_stream *stream = msblk->stream; |
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if (stream) { |
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msblk->decompressor->free(stream->stream); |
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kfree(stream); |
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} |
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} |
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int squashfs_decompress(struct squashfs_sb_info *msblk, struct bio *bio, |
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int offset, int length, |
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struct squashfs_page_actor *output) |
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{ |
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int res; |
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struct squashfs_stream *stream = msblk->stream; |
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mutex_lock(&stream->mutex); |
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res = msblk->decompressor->decompress(msblk, stream->stream, bio, |
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offset, length, output); |
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mutex_unlock(&stream->mutex); |
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if (res < 0) |
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ERROR("%s decompression failed, data probably corrupt\n", |
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msblk->decompressor->name); |
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return res; |
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} |
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int squashfs_max_decompressors(void) |
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{ |
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return 1; |
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}
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