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102 lines
2.2 KiB
102 lines
2.2 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/slab.h> |
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#include <linux/percpu.h> |
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#include <linux/buffer_head.h> |
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#include <linux/local_lock.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 multi-threaded decompression using percpu |
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* variables, one thread per cpu core. |
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*/ |
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struct squashfs_stream { |
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void *stream; |
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local_lock_t lock; |
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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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struct squashfs_stream __percpu *percpu; |
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int err, cpu; |
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percpu = alloc_percpu(struct squashfs_stream); |
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if (percpu == NULL) |
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return ERR_PTR(-ENOMEM); |
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for_each_possible_cpu(cpu) { |
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stream = per_cpu_ptr(percpu, cpu); |
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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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local_lock_init(&stream->lock); |
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} |
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kfree(comp_opts); |
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return (__force void *) percpu; |
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out: |
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for_each_possible_cpu(cpu) { |
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stream = per_cpu_ptr(percpu, cpu); |
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if (!IS_ERR_OR_NULL(stream->stream)) |
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msblk->decompressor->free(stream->stream); |
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} |
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free_percpu(percpu); |
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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 __percpu *percpu = |
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(struct squashfs_stream __percpu *) msblk->stream; |
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struct squashfs_stream *stream; |
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int cpu; |
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if (msblk->stream) { |
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for_each_possible_cpu(cpu) { |
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stream = per_cpu_ptr(percpu, cpu); |
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msblk->decompressor->free(stream->stream); |
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} |
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free_percpu(percpu); |
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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, struct squashfs_page_actor *output) |
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{ |
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struct squashfs_stream *stream; |
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int res; |
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local_lock(&msblk->stream->lock); |
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stream = this_cpu_ptr(msblk->stream); |
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res = msblk->decompressor->decompress(msblk, stream->stream, bio, |
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offset, length, output); |
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local_unlock(&msblk->stream->lock); |
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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 num_possible_cpus(); |
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}
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