stagingpages are behaved as bounce pages for temporary use. Move to compress.h since the upcoming decompressor will allocate stagingpages as well. Signed-off-by: Gao Xiang <gaoxiang25@xxxxxxxxxx> --- drivers/staging/erofs/compress.h | 40 +++++++++++++++++++++++++++++++ drivers/staging/erofs/unzip_vle.c | 11 +++++---- drivers/staging/erofs/unzip_vle.h | 20 ---------------- 3 files changed, 46 insertions(+), 25 deletions(-) create mode 100644 drivers/staging/erofs/compress.h diff --git a/drivers/staging/erofs/compress.h b/drivers/staging/erofs/compress.h new file mode 100644 index 000000000000..1dcfc3b35118 --- /dev/null +++ b/drivers/staging/erofs/compress.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * linux/drivers/staging/erofs/compress.h + * + * Copyright (C) 2019 HUAWEI, Inc. + * http://www.huawei.com/ + * Created by Gao Xiang <gaoxiang25@xxxxxxxxxx> + */ +#ifndef __EROFS_FS_COMPRESS_H +#define __EROFS_FS_COMPRESS_H + +/* + * - 0x5A110C8D ('sallocated', Z_EROFS_MAPPING_STAGING) - + * used to mark temporary allocated pages from other + * file/cached pages and NULL mapping pages. + */ +#define Z_EROFS_MAPPING_STAGING ((void *)0x5A110C8D) + +/* check if a page is marked as staging */ +static inline bool z_erofs_page_is_staging(struct page *page) +{ + return page->mapping == Z_EROFS_MAPPING_STAGING; +} + +static inline bool z_erofs_put_stagingpage(struct list_head *pagepool, + struct page *page) +{ + if (!z_erofs_page_is_staging(page)) + return false; + + /* staging pages should not be used by others at the same time */ + if (page_ref_count(page) > 1) + put_page(page); + else + list_add(&page->lru, pagepool); + return true; +} + +#endif + diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c index 08f2d4302ecb..d95f985936b6 100644 --- a/drivers/staging/erofs/unzip_vle.c +++ b/drivers/staging/erofs/unzip_vle.c @@ -11,6 +11,7 @@ * distribution for more details. */ #include "unzip_vle.h" +#include "compress.h" #include <linux/prefetch.h> #include <trace/events/erofs.h> @@ -855,7 +856,7 @@ static inline void z_erofs_vle_read_endio(struct bio *bio) DBG_BUGON(PageUptodate(page)); DBG_BUGON(!page->mapping); - if (unlikely(!sbi && !z_erofs_is_stagingpage(page))) { + if (unlikely(!sbi && !z_erofs_page_is_staging(page))) { sbi = EROFS_SB(page->mapping->host->i_sb); if (time_to_inject(sbi, FAULT_READ_IO)) { @@ -947,7 +948,7 @@ static int z_erofs_vle_unzip(struct super_block *sb, DBG_BUGON(!page); DBG_BUGON(!page->mapping); - if (z_erofs_gather_if_stagingpage(page_pool, page)) + if (z_erofs_put_stagingpage(page_pool, page)) continue; if (page_type == Z_EROFS_VLE_PAGE_TYPE_HEAD) @@ -977,7 +978,7 @@ static int z_erofs_vle_unzip(struct super_block *sb, DBG_BUGON(!page); DBG_BUGON(!page->mapping); - if (!z_erofs_is_stagingpage(page)) { + if (!z_erofs_page_is_staging(page)) { if (erofs_page_is_managed(sbi, page)) { if (unlikely(!PageUptodate(page))) err = -EIO; @@ -1055,7 +1056,7 @@ static int z_erofs_vle_unzip(struct super_block *sb, continue; /* recycle all individual staging pages */ - (void)z_erofs_gather_if_stagingpage(page_pool, page); + (void)z_erofs_put_stagingpage(page_pool, page); WRITE_ONCE(compressed_pages[i], NULL); } @@ -1068,7 +1069,7 @@ static int z_erofs_vle_unzip(struct super_block *sb, DBG_BUGON(!page->mapping); /* recycle all individual staging pages */ - if (z_erofs_gather_if_stagingpage(page_pool, page)) + if (z_erofs_put_stagingpage(page_pool, page)) continue; if (unlikely(err < 0)) diff --git a/drivers/staging/erofs/unzip_vle.h b/drivers/staging/erofs/unzip_vle.h index 9c53009700cf..6c3e0deb63e7 100644 --- a/drivers/staging/erofs/unzip_vle.h +++ b/drivers/staging/erofs/unzip_vle.h @@ -16,26 +16,6 @@ #include "internal.h" #include "unzip_pagevec.h" -/* - * - 0x5A110C8D ('sallocated', Z_EROFS_MAPPING_STAGING) - - * used for temporary allocated pages (via erofs_allocpage), - * in order to seperate those from NULL mapping (eg. truncated pages) - */ -#define Z_EROFS_MAPPING_STAGING ((void *)0x5A110C8D) - -#define z_erofs_is_stagingpage(page) \ - ((page)->mapping == Z_EROFS_MAPPING_STAGING) - -static inline bool z_erofs_gather_if_stagingpage(struct list_head *page_pool, - struct page *page) -{ - if (z_erofs_is_stagingpage(page)) { - list_add(&page->lru, page_pool); - return true; - } - return false; -} - /* * Structure fields follow one of the following exclusion rules. * -- 2.17.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
