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Linux/fs/squashfs/decompressor_multi_percpu.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (c) 2013
  4  * Phillip Lougher <phillip@squashfs.org.uk>
  5  */
  6 
  7 #include <linux/types.h>
  8 #include <linux/slab.h>
  9 #include <linux/percpu.h>
 10 #include <linux/buffer_head.h>
 11 #include <linux/local_lock.h>
 12 
 13 #include "squashfs_fs.h"
 14 #include "squashfs_fs_sb.h"
 15 #include "decompressor.h"
 16 #include "squashfs.h"
 17 
 18 /*
 19  * This file implements multi-threaded decompression using percpu
 20  * variables, one thread per cpu core.
 21  */
 22 
 23 struct squashfs_stream {
 24         void                    *stream;
 25         local_lock_t    lock;
 26 };
 27 
 28 void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
 29                                                 void *comp_opts)
 30 {
 31         struct squashfs_stream *stream;
 32         struct squashfs_stream __percpu *percpu;
 33         int err, cpu;
 34 
 35         percpu = alloc_percpu(struct squashfs_stream);
 36         if (percpu == NULL)
 37                 return ERR_PTR(-ENOMEM);
 38 
 39         for_each_possible_cpu(cpu) {
 40                 stream = per_cpu_ptr(percpu, cpu);
 41                 stream->stream = msblk->decompressor->init(msblk, comp_opts);
 42                 if (IS_ERR(stream->stream)) {
 43                         err = PTR_ERR(stream->stream);
 44                         goto out;
 45                 }
 46                 local_lock_init(&stream->lock);
 47         }
 48 
 49         kfree(comp_opts);
 50         return (__force void *) percpu;
 51 
 52 out:
 53         for_each_possible_cpu(cpu) {
 54                 stream = per_cpu_ptr(percpu, cpu);
 55                 if (!IS_ERR_OR_NULL(stream->stream))
 56                         msblk->decompressor->free(stream->stream);
 57         }
 58         free_percpu(percpu);
 59         return ERR_PTR(err);
 60 }
 61 
 62 void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
 63 {
 64         struct squashfs_stream __percpu *percpu =
 65                         (struct squashfs_stream __percpu *) msblk->stream;
 66         struct squashfs_stream *stream;
 67         int cpu;
 68 
 69         if (msblk->stream) {
 70                 for_each_possible_cpu(cpu) {
 71                         stream = per_cpu_ptr(percpu, cpu);
 72                         msblk->decompressor->free(stream->stream);
 73                 }
 74                 free_percpu(percpu);
 75         }
 76 }
 77 
 78 int squashfs_decompress(struct squashfs_sb_info *msblk, struct bio *bio,
 79         int offset, int length, struct squashfs_page_actor *output)
 80 {
 81         struct squashfs_stream *stream;
 82         int res;
 83 
 84         local_lock(&msblk->stream->lock);
 85         stream = this_cpu_ptr(msblk->stream);
 86 
 87         res = msblk->decompressor->decompress(msblk, stream->stream, bio,
 88                                               offset, length, output);
 89 
 90         local_unlock(&msblk->stream->lock);
 91 
 92         if (res < 0)
 93                 ERROR("%s decompression failed, data probably corrupt\n",
 94                         msblk->decompressor->name);
 95 
 96         return res;
 97 }
 98 
 99 int squashfs_max_decompressors(void)
100 {
101         return num_possible_cpus();
102 }
103 

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