mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 14:14:01 +08:00
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
|
|
/*
|
|
* Copyright (c) 2013
|
|
* Phillip Lougher <phillip@squashfs.org.uk>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/local_lock.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;
|
|
local_lock_t lock;
|
|
};
|
|
|
|
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;
|
|
}
|
|
local_lock_init(&stream->lock);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
int squashfs_decompress(struct squashfs_sb_info *msblk, struct bio *bio,
|
|
int offset, int length, struct squashfs_page_actor *output)
|
|
{
|
|
struct squashfs_stream *stream;
|
|
int res;
|
|
|
|
local_lock(&msblk->stream->lock);
|
|
stream = this_cpu_ptr(msblk->stream);
|
|
|
|
res = msblk->decompressor->decompress(msblk, stream->stream, bio,
|
|
offset, length, output);
|
|
|
|
local_unlock(&msblk->stream->lock);
|
|
|
|
if (res < 0)
|
|
ERROR("%s decompression failed, data probably corrupt\n",
|
|
msblk->decompressor->name);
|
|
|
|
return res;
|
|
}
|
|
|
|
int squashfs_max_decompressors(void)
|
|
{
|
|
return num_possible_cpus();
|
|
}
|