forked from luck/tmp_suning_uos_patched
94709049fb
Merge updates from Andrew Morton: "A few little subsystems and a start of a lot of MM patches. Subsystems affected by this patch series: squashfs, ocfs2, parisc, vfs. With mm subsystems: slab-generic, slub, debug, pagecache, gup, swap, memcg, pagemap, memory-failure, vmalloc, kasan" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (128 commits) kasan: move kasan_report() into report.c mm/mm_init.c: report kasan-tag information stored in page->flags ubsan: entirely disable alignment checks under UBSAN_TRAP kasan: fix clang compilation warning due to stack protector x86/mm: remove vmalloc faulting mm: remove vmalloc_sync_(un)mappings() x86/mm/32: implement arch_sync_kernel_mappings() x86/mm/64: implement arch_sync_kernel_mappings() mm/ioremap: track which page-table levels were modified mm/vmalloc: track which page-table levels were modified mm: add functions to track page directory modifications s390: use __vmalloc_node in stack_alloc powerpc: use __vmalloc_node in alloc_vm_stack arm64: use __vmalloc_node in arch_alloc_vmap_stack mm: remove vmalloc_user_node_flags mm: switch the test_vmalloc module to use __vmalloc_node mm: remove __vmalloc_node_flags_caller mm: remove both instances of __vmalloc_node_flags mm: remove the prot argument to __vmalloc_node mm: remove the pgprot argument to __vmalloc ...
103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2013
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* Phillip Lougher <phillip@squashfs.org.uk>
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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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