cregit-Linux how code gets into the kernel

Release 4.18 fs/squashfs/decompressor_multi_percpu.c

Directory: fs/squashfs
/*
 * Copyright (c) 2013
 * Phillip Lougher <phillip@squashfs.org.uk>
 *
 * This work is licensed under the terms of the GNU GPL, version 2. See
 * the COPYING file in the top-level directory.
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/percpu.h>
#include <linux/buffer_head.h>

#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
#include "decompressor.h"
#include "squashfs.h"

/*
 * This file implements multi-threaded decompression using percpu
 * variables, one thread per cpu core.
 */


struct squashfs_stream {
	
void		*stream;
};


void *squashfs_decompressor_create(struct squashfs_sb_info *msblk, void *comp_opts) { struct squashfs_stream *stream; struct squashfs_stream __percpu *percpu; int err, cpu; percpu = alloc_percpu(struct squashfs_stream); if (percpu == NULL) return ERR_PTR(-ENOMEM); for_each_possible_cpu(cpu) { stream = per_cpu_ptr(percpu, cpu); stream->stream = msblk->decompressor->init(msblk, comp_opts); if (IS_ERR(stream->stream)) { err = PTR_ERR(stream->stream); goto out; } } kfree(comp_opts); return (__force void *) percpu; out: for_each_possible_cpu(cpu) { stream = per_cpu_ptr(percpu, cpu); if (!IS_ERR_OR_NULL(stream->stream)) msblk->decompressor->free(stream->stream); } free_percpu(percpu); return ERR_PTR(err); }

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Phillip Lougher167100.00%1100.00%
Total167100.00%1100.00%


void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk) { struct squashfs_stream __percpu *percpu = (struct squashfs_stream __percpu *) msblk->stream; struct squashfs_stream *stream; int cpu; if (msblk->stream) { for_each_possible_cpu(cpu) { stream = per_cpu_ptr(percpu, cpu); msblk->decompressor->free(stream->stream); } free_percpu(percpu); } }

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Phillip Lougher73100.00%1100.00%
Total73100.00%1100.00%


int squashfs_decompress(struct squashfs_sb_info *msblk, struct buffer_head **bh, int b, int offset, int length, struct squashfs_page_actor *output) { struct squashfs_stream __percpu *percpu = (struct squashfs_stream __percpu *) msblk->stream; struct squashfs_stream *stream = get_cpu_ptr(percpu); int res = msblk->decompressor->decompress(msblk, stream->stream, bh, b, offset, length, output); put_cpu_ptr(stream); if (res < 0) ERROR("%s decompression failed, data probably corrupt\n", msblk->decompressor->name); return res; }

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Phillip Lougher107100.00%2100.00%
Total107100.00%2100.00%


int squashfs_max_decompressors(void) { return num_possible_cpus(); }

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Phillip Lougher11100.00%1100.00%
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Overall Contributors

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Phillip Lougher393100.00%2100.00%
Total393100.00%2100.00%
Directory: fs/squashfs
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