diff options
Diffstat (limited to 'drivers/staging/erofs/unzip_vle_lz4.c')
| -rw-r--r-- | drivers/staging/erofs/unzip_vle_lz4.c | 229 |
1 files changed, 0 insertions, 229 deletions
diff --git a/drivers/staging/erofs/unzip_vle_lz4.c b/drivers/staging/erofs/unzip_vle_lz4.c deleted file mode 100644 index 0daac9b984a8..000000000000 --- a/drivers/staging/erofs/unzip_vle_lz4.c +++ /dev/null @@ -1,229 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * linux/drivers/staging/erofs/unzip_vle_lz4.c - * - * Copyright (C) 2018 HUAWEI, Inc. - * http://www.huawei.com/ - * Created by Gao Xiang <gaoxiang25@huawei.com> - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file COPYING in the main directory of the Linux - * distribution for more details. - */ -#include "unzip_vle.h" -#include <linux/lz4.h> - -static int z_erofs_unzip_lz4(void *in, void *out, size_t inlen, size_t outlen) -{ - int ret = LZ4_decompress_safe_partial(in, out, inlen, outlen, outlen); - - if (ret >= 0) - return ret; - - /* - * LZ4_decompress_safe_partial will return an error code - * (< 0) if decompression failed - */ - errln("%s, failed to decompress, in[%p, %zu] outlen[%p, %zu]", - __func__, in, inlen, out, outlen); - WARN_ON(1); - print_hex_dump(KERN_DEBUG, "raw data [in]: ", DUMP_PREFIX_OFFSET, - 16, 1, in, inlen, true); - print_hex_dump(KERN_DEBUG, "raw data [out]: ", DUMP_PREFIX_OFFSET, - 16, 1, out, outlen, true); - return -EIO; -} - -#if Z_EROFS_CLUSTER_MAX_PAGES > Z_EROFS_VLE_INLINE_PAGEVECS -#define EROFS_PERCPU_NR_PAGES Z_EROFS_CLUSTER_MAX_PAGES -#else -#define EROFS_PERCPU_NR_PAGES Z_EROFS_VLE_INLINE_PAGEVECS -#endif - -static struct { - char data[PAGE_SIZE * EROFS_PERCPU_NR_PAGES]; -} erofs_pcpubuf[NR_CPUS]; - -int z_erofs_vle_plain_copy(struct page **compressed_pages, - unsigned int clusterpages, - struct page **pages, - unsigned int nr_pages, - unsigned short pageofs) -{ - unsigned int i, j; - void *src = NULL; - const unsigned int righthalf = PAGE_SIZE - pageofs; - char *percpu_data; - bool mirrored[Z_EROFS_CLUSTER_MAX_PAGES] = { 0 }; - - preempt_disable(); - percpu_data = erofs_pcpubuf[smp_processor_id()].data; - - j = 0; - for (i = 0; i < nr_pages; j = i++) { - struct page *page = pages[i]; - void *dst; - - if (!page) { - if (src) { - if (!mirrored[j]) - kunmap_atomic(src); - src = NULL; - } - continue; - } - - dst = kmap_atomic(page); - - for (; j < clusterpages; ++j) { - if (compressed_pages[j] != page) - continue; - - DBG_BUGON(mirrored[j]); - memcpy(percpu_data + j * PAGE_SIZE, dst, PAGE_SIZE); - mirrored[j] = true; - break; - } - - if (i) { - if (!src) - src = mirrored[i - 1] ? - percpu_data + (i - 1) * PAGE_SIZE : - kmap_atomic(compressed_pages[i - 1]); - - memcpy(dst, src + righthalf, pageofs); - - if (!mirrored[i - 1]) - kunmap_atomic(src); - - if (unlikely(i >= clusterpages)) { - kunmap_atomic(dst); - break; - } - } - - if (!righthalf) { - src = NULL; - } else { - src = mirrored[i] ? percpu_data + i * PAGE_SIZE : - kmap_atomic(compressed_pages[i]); - - memcpy(dst + pageofs, src, righthalf); - } - - kunmap_atomic(dst); - } - - if (src && !mirrored[j]) - kunmap_atomic(src); - - preempt_enable(); - return 0; -} - -int z_erofs_vle_unzip_fast_percpu(struct page **compressed_pages, - unsigned int clusterpages, - struct page **pages, - unsigned int outlen, - unsigned short pageofs) -{ - void *vin, *vout; - unsigned int nr_pages, i, j; - int ret; - - if (outlen + pageofs > EROFS_PERCPU_NR_PAGES * PAGE_SIZE) - return -ENOTSUPP; - - nr_pages = DIV_ROUND_UP(outlen + pageofs, PAGE_SIZE); - - if (clusterpages == 1) { - vin = kmap_atomic(compressed_pages[0]); - } else { - vin = erofs_vmap(compressed_pages, clusterpages); - if (!vin) - return -ENOMEM; - } - - preempt_disable(); - vout = erofs_pcpubuf[smp_processor_id()].data; - - ret = z_erofs_unzip_lz4(vin, vout + pageofs, - clusterpages * PAGE_SIZE, outlen); - - if (ret < 0) - goto out; - ret = 0; - - for (i = 0; i < nr_pages; ++i) { - j = min((unsigned int)PAGE_SIZE - pageofs, outlen); - - if (pages[i]) { - if (clusterpages == 1 && - pages[i] == compressed_pages[0]) { - memcpy(vin + pageofs, vout + pageofs, j); - } else { - void *dst = kmap_atomic(pages[i]); - - memcpy(dst + pageofs, vout + pageofs, j); - kunmap_atomic(dst); - } - } - vout += PAGE_SIZE; - outlen -= j; - pageofs = 0; - } - -out: - preempt_enable(); - - if (clusterpages == 1) - kunmap_atomic(vin); - else - erofs_vunmap(vin, clusterpages); - - return ret; -} - -int z_erofs_vle_unzip_vmap(struct page **compressed_pages, - unsigned int clusterpages, - void *vout, - unsigned int llen, - unsigned short pageofs, - bool overlapped) -{ - void *vin; - unsigned int i; - int ret; - - if (overlapped) { - preempt_disable(); - vin = erofs_pcpubuf[smp_processor_id()].data; - - for (i = 0; i < clusterpages; ++i) { - void *t = kmap_atomic(compressed_pages[i]); - - memcpy(vin + PAGE_SIZE * i, t, PAGE_SIZE); - kunmap_atomic(t); - } - } else if (clusterpages == 1) { - vin = kmap_atomic(compressed_pages[0]); - } else { - vin = erofs_vmap(compressed_pages, clusterpages); - } - - ret = z_erofs_unzip_lz4(vin, vout + pageofs, - clusterpages * PAGE_SIZE, llen); - if (ret > 0) - ret = 0; - - if (!overlapped) { - if (clusterpages == 1) - kunmap_atomic(vin); - else - erofs_vunmap(vin, clusterpages); - } else { - preempt_enable(); - } - return ret; -} - |