| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Chris Mason | 1321 | 63.54% | 16 | 27.12% |
| Mikhail Zaslonko | 228 | 10.97% | 1 | 1.69% |
| Li Zefan | 174 | 8.37% | 3 | 5.08% |
| David Sterba | 95 | 4.57% | 18 | 30.51% |
| Sergey Senozhatsky | 76 | 3.66% | 1 | 1.69% |
| Qu Wenruo | 46 | 2.21% | 2 | 3.39% |
| Dennis Zhou | 41 | 1.97% | 4 | 6.78% |
| Fabio M. De Francesco | 24 | 1.15% | 2 | 3.39% |
| Anand Jain | 22 | 1.06% | 1 | 1.69% |
| Kirill A. Shutemov | 14 | 0.67% | 1 | 1.69% |
| Zach Brown | 11 | 0.53% | 1 | 1.69% |
| Josef Bacik | 7 | 0.34% | 1 | 1.69% |
| James Keniston | 5 | 0.24% | 1 | 1.69% |
| Jeff Mahoney | 4 | 0.19% | 1 | 1.69% |
| Frank Holton | 4 | 0.19% | 1 | 1.69% |
| Ira Weiny | 3 | 0.14% | 2 | 3.39% |
| Timofey Titovets | 2 | 0.10% | 1 | 1.69% |
| Christoph Hellwig | 1 | 0.05% | 1 | 1.69% |
| Alexander Potapenko | 1 | 0.05% | 1 | 1.69% |
| Total | 2079 | 59 |
// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2008 Oracle. All rights reserved. * * Based on jffs2 zlib code: * Copyright © 2001-2007 Red Hat, Inc. * Created by David Woodhouse <dwmw2@infradead.org> */ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/zlib.h> #include <linux/zutil.h> #include <linux/mm.h> #include <linux/init.h> #include <linux/err.h> #include <linux/sched.h> #include <linux/pagemap.h> #include <linux/bio.h> #include <linux/refcount.h> #include "compression.h" /* workspace buffer size for s390 zlib hardware support */ #define ZLIB_DFLTCC_BUF_SIZE (4 * PAGE_SIZE) struct workspace { z_stream strm; char *buf; unsigned int buf_size; struct list_head list; int level; }; static struct workspace_manager wsm; struct list_head *zlib_get_workspace(unsigned int level) { struct list_head *ws = btrfs_get_workspace(BTRFS_COMPRESS_ZLIB, level); struct workspace *workspace = list_entry(ws, struct workspace, list); workspace->level = level; return ws; } void zlib_free_workspace(struct list_head *ws) { struct workspace *workspace = list_entry(ws, struct workspace, list); kvfree(workspace->strm.workspace); kfree(workspace->buf); kfree(workspace); } struct list_head *zlib_alloc_workspace(unsigned int level) { struct workspace *workspace; int workspacesize; workspace = kzalloc(sizeof(*workspace), GFP_KERNEL); if (!workspace) return ERR_PTR(-ENOMEM); workspacesize = max(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL), zlib_inflate_workspacesize()); workspace->strm.workspace = kvzalloc(workspacesize, GFP_KERNEL | __GFP_NOWARN); workspace->level = level; workspace->buf = NULL; /* * In case of s390 zlib hardware support, allocate lager workspace * buffer. If allocator fails, fall back to a single page buffer. */ if (zlib_deflate_dfltcc_enabled()) { workspace->buf = kmalloc(ZLIB_DFLTCC_BUF_SIZE, __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | GFP_NOIO); workspace->buf_size = ZLIB_DFLTCC_BUF_SIZE; } if (!workspace->buf) { workspace->buf = kmalloc(PAGE_SIZE, GFP_KERNEL); workspace->buf_size = PAGE_SIZE; } if (!workspace->strm.workspace || !workspace->buf) goto fail; INIT_LIST_HEAD(&workspace->list); return &workspace->list; fail: zlib_free_workspace(&workspace->list); return ERR_PTR(-ENOMEM); } int zlib_compress_pages(struct list_head *ws, struct address_space *mapping, u64 start, struct page **pages, unsigned long *out_pages, unsigned long *total_in, unsigned long *total_out) { struct workspace *workspace = list_entry(ws, struct workspace, list); int ret; char *data_in = NULL; char *cpage_out; int nr_pages = 0; struct page *in_page = NULL; struct page *out_page = NULL; unsigned long bytes_left; unsigned int in_buf_pages; unsigned long len = *total_out; unsigned long nr_dest_pages = *out_pages; const unsigned long max_out = nr_dest_pages * PAGE_SIZE; *out_pages = 0; *total_out = 0; *total_in = 0; if (Z_OK != zlib_deflateInit(&workspace->strm, workspace->level)) { pr_warn("BTRFS: deflateInit failed\n"); ret = -EIO; goto out; } workspace->strm.total_in = 0; workspace->strm.total_out = 0; out_page = btrfs_alloc_compr_page(); if (out_page == NULL) { ret = -ENOMEM; goto out; } cpage_out = page_address(out_page); pages[0] = out_page; nr_pages = 1; workspace->strm.next_in = workspace->buf; workspace->strm.avail_in = 0; workspace->strm.next_out = cpage_out; workspace->strm.avail_out = PAGE_SIZE; while (workspace->strm.total_in < len) { /* * Get next input pages and copy the contents to * the workspace buffer if required. */ if (workspace->strm.avail_in == 0) { bytes_left = len - workspace->strm.total_in; in_buf_pages = min(DIV_ROUND_UP(bytes_left, PAGE_SIZE), workspace->buf_size / PAGE_SIZE); if (in_buf_pages > 1) { int i; for (i = 0; i < in_buf_pages; i++) { if (data_in) { kunmap_local(data_in); put_page(in_page); } in_page = find_get_page(mapping, start >> PAGE_SHIFT); data_in = kmap_local_page(in_page); copy_page(workspace->buf + i * PAGE_SIZE, data_in); start += PAGE_SIZE; } workspace->strm.next_in = workspace->buf; } else { if (data_in) { kunmap_local(data_in); put_page(in_page); } in_page = find_get_page(mapping, start >> PAGE_SHIFT); data_in = kmap_local_page(in_page); start += PAGE_SIZE; workspace->strm.next_in = data_in; } workspace->strm.avail_in = min(bytes_left, (unsigned long) workspace->buf_size); } ret = zlib_deflate(&workspace->strm, Z_SYNC_FLUSH); if (ret != Z_OK) { pr_debug("BTRFS: deflate in loop returned %d\n", ret); zlib_deflateEnd(&workspace->strm); ret = -EIO; goto out; } /* we're making it bigger, give up */ if (workspace->strm.total_in > 8192 && workspace->strm.total_in < workspace->strm.total_out) { ret = -E2BIG; goto out; } /* we need another page for writing out. Test this * before the total_in so we will pull in a new page for * the stream end if required */ if (workspace->strm.avail_out == 0) { if (nr_pages == nr_dest_pages) { ret = -E2BIG; goto out; } out_page = btrfs_alloc_compr_page(); if (out_page == NULL) { ret = -ENOMEM; goto out; } cpage_out = page_address(out_page); pages[nr_pages] = out_page; nr_pages++; workspace->strm.avail_out = PAGE_SIZE; workspace->strm.next_out = cpage_out; } /* we're all done */ if (workspace->strm.total_in >= len) break; if (workspace->strm.total_out > max_out) break; } workspace->strm.avail_in = 0; /* * Call deflate with Z_FINISH flush parameter providing more output * space but no more input data, until it returns with Z_STREAM_END. */ while (ret != Z_STREAM_END) { ret = zlib_deflate(&workspace->strm, Z_FINISH); if (ret == Z_STREAM_END) break; if (ret != Z_OK && ret != Z_BUF_ERROR) { zlib_deflateEnd(&workspace->strm); ret = -EIO; goto out; } else if (workspace->strm.avail_out == 0) { /* get another page for the stream end */ if (nr_pages == nr_dest_pages) { ret = -E2BIG; goto out; } out_page = btrfs_alloc_compr_page(); if (out_page == NULL) { ret = -ENOMEM; goto out; } cpage_out = page_address(out_page); pages[nr_pages] = out_page; nr_pages++; workspace->strm.avail_out = PAGE_SIZE; workspace->strm.next_out = cpage_out; } } zlib_deflateEnd(&workspace->strm); if (workspace->strm.total_out >= workspace->strm.total_in) { ret = -E2BIG; goto out; } ret = 0; *total_out = workspace->strm.total_out; *total_in = workspace->strm.total_in; out: *out_pages = nr_pages; if (data_in) { kunmap_local(data_in); put_page(in_page); } return ret; } int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb) { struct workspace *workspace = list_entry(ws, struct workspace, list); int ret = 0, ret2; int wbits = MAX_WBITS; char *data_in; size_t total_out = 0; unsigned long page_in_index = 0; size_t srclen = cb->compressed_len; unsigned long total_pages_in = DIV_ROUND_UP(srclen, PAGE_SIZE); unsigned long buf_start; struct page **pages_in = cb->compressed_pages; data_in = kmap_local_page(pages_in[page_in_index]); workspace->strm.next_in = data_in; workspace->strm.avail_in = min_t(size_t, srclen, PAGE_SIZE); workspace->strm.total_in = 0; workspace->strm.total_out = 0; workspace->strm.next_out = workspace->buf; workspace->strm.avail_out = workspace->buf_size; /* If it's deflate, and it's got no preset dictionary, then we can tell zlib to skip the adler32 check. */ if (srclen > 2 && !(data_in[1] & PRESET_DICT) && ((data_in[0] & 0x0f) == Z_DEFLATED) && !(((data_in[0]<<8) + data_in[1]) % 31)) { wbits = -((data_in[0] >> 4) + 8); workspace->strm.next_in += 2; workspace->strm.avail_in -= 2; } if (Z_OK != zlib_inflateInit2(&workspace->strm, wbits)) { pr_warn("BTRFS: inflateInit failed\n"); kunmap_local(data_in); return -EIO; } while (workspace->strm.total_in < srclen) { ret = zlib_inflate(&workspace->strm, Z_NO_FLUSH); if (ret != Z_OK && ret != Z_STREAM_END) break; buf_start = total_out; total_out = workspace->strm.total_out; /* we didn't make progress in this inflate call, we're done */ if (buf_start == total_out) break; ret2 = btrfs_decompress_buf2page(workspace->buf, total_out - buf_start, cb, buf_start); if (ret2 == 0) { ret = 0; goto done; } workspace->strm.next_out = workspace->buf; workspace->strm.avail_out = workspace->buf_size; if (workspace->strm.avail_in == 0) { unsigned long tmp; kunmap_local(data_in); page_in_index++; if (page_in_index >= total_pages_in) { data_in = NULL; break; } data_in = kmap_local_page(pages_in[page_in_index]); workspace->strm.next_in = data_in; tmp = srclen - workspace->strm.total_in; workspace->strm.avail_in = min(tmp, PAGE_SIZE); } } if (ret != Z_STREAM_END) ret = -EIO; else ret = 0; done: zlib_inflateEnd(&workspace->strm); if (data_in) kunmap_local(data_in); return ret; } int zlib_decompress(struct list_head *ws, const u8 *data_in, struct page *dest_page, unsigned long dest_pgoff, size_t srclen, size_t destlen) { struct workspace *workspace = list_entry(ws, struct workspace, list); int ret = 0; int wbits = MAX_WBITS; unsigned long to_copy; workspace->strm.next_in = data_in; workspace->strm.avail_in = srclen; workspace->strm.total_in = 0; workspace->strm.next_out = workspace->buf; workspace->strm.avail_out = workspace->buf_size; workspace->strm.total_out = 0; /* If it's deflate, and it's got no preset dictionary, then we can tell zlib to skip the adler32 check. */ if (srclen > 2 && !(data_in[1] & PRESET_DICT) && ((data_in[0] & 0x0f) == Z_DEFLATED) && !(((data_in[0]<<8) + data_in[1]) % 31)) { wbits = -((data_in[0] >> 4) + 8); workspace->strm.next_in += 2; workspace->strm.avail_in -= 2; } if (Z_OK != zlib_inflateInit2(&workspace->strm, wbits)) { pr_warn("BTRFS: inflateInit failed\n"); return -EIO; } /* * Everything (in/out buf) should be at most one sector, there should * be no need to switch any input/output buffer. */ ret = zlib_inflate(&workspace->strm, Z_FINISH); to_copy = min(workspace->strm.total_out, destlen); if (ret != Z_STREAM_END) goto out; memcpy_to_page(dest_page, dest_pgoff, workspace->buf, to_copy); out: if (unlikely(to_copy != destlen)) { pr_warn_ratelimited("BTRFS: infalte failed, decompressed=%lu expected=%zu\n", to_copy, destlen); ret = -EIO; } else { ret = 0; } zlib_inflateEnd(&workspace->strm); if (unlikely(to_copy < destlen)) memzero_page(dest_page, dest_pgoff + to_copy, destlen - to_copy); return ret; } const struct btrfs_compress_op btrfs_zlib_compress = { .workspace_manager = &wsm, .max_level = 9, .default_level = BTRFS_ZLIB_DEFAULT_LEVEL, };