set_page_private_# increases a refcount after attaching page->private, and clear_page_private_# decreases it. But, f2fs_release_folio and f2fs_invalidate_folio call folio_detach_private() which decreases the refcount again, which corrupts the page cache.
Cc: <[email protected]> Fixes: b763f3bedc2d ("f2fs: restructure f2fs page.private layout") Signed-off-by: Jaegeuk Kim <[email protected]> --- fs/f2fs/compress.c | 4 ++-- fs/f2fs/data.c | 6 ++++-- fs/f2fs/f2fs.h | 48 ++++++++++++++++------------------------------ 3 files changed, 22 insertions(+), 36 deletions(-) diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c index 11653fa79289..70b3910db413 100644 --- a/fs/f2fs/compress.c +++ b/fs/f2fs/compress.c @@ -1854,7 +1854,7 @@ void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page, return; } - set_page_private_data(cpage, ino); + set_page_private_ino(cpage, ino); if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ)) goto out; @@ -1917,7 +1917,7 @@ void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino) continue; } - if (ino != get_page_private_data(&folio->page)) { + if (ino != get_page_private_ino(&folio->page)) { folio_unlock(folio); continue; } diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 359de650772e..7262c754ff8b 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -3724,8 +3724,9 @@ void f2fs_invalidate_folio(struct folio *folio, size_t offset, size_t length) if (test_opt(sbi, COMPRESS_CACHE) && inode->i_ino == F2FS_COMPRESS_INO(sbi)) - clear_page_private_data(&folio->page); + clear_page_private_ino(&folio->page); + WARN_ON_ONCE(page_private(&folio->page)); folio_detach_private(folio); } @@ -3742,12 +3743,13 @@ bool f2fs_release_folio(struct folio *folio, gfp_t wait) struct inode *inode = folio->mapping->host; if (inode->i_ino == F2FS_COMPRESS_INO(sbi)) - clear_page_private_data(&folio->page); + clear_page_private_ino(&folio->page); } clear_page_private_reference(&folio->page); clear_page_private_gcing(&folio->page); + WARN_ON_ONCE(page_private(&folio->page)); folio_detach_private(folio); return true; } diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index dfead8160a51..3d883201e7a5 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1395,6 +1395,7 @@ enum { PAGE_PRIVATE_ONGOING_MIGRATION, /* data page which is on-going migrating */ PAGE_PRIVATE_INLINE_INODE, /* inode page contains inline data */ PAGE_PRIVATE_REF_RESOURCE, /* dirty page has referenced resources */ + PAGE_PRIVATE_DATA, /* page has referenced data */ PAGE_PRIVATE_MAX }; @@ -1409,73 +1410,56 @@ static inline bool page_private_##name(struct page *page) \ #define PAGE_PRIVATE_SET_FUNC(name, flagname) \ static inline void set_page_private_##name(struct page *page) \ { \ - if (!PagePrivate(page)) { \ - get_page(page); \ - SetPagePrivate(page); \ - set_page_private(page, 0); \ - } \ + if (!PagePrivate(page)) \ + attach_page_private(page, 0); \ set_bit(PAGE_PRIVATE_NOT_POINTER, &page_private(page)); \ set_bit(PAGE_PRIVATE_##flagname, &page_private(page)); \ } +/* clear private by f2fs_release_folio or f2fs_invalidate_folio */ #define PAGE_PRIVATE_CLEAR_FUNC(name, flagname) \ static inline void clear_page_private_##name(struct page *page) \ { \ clear_bit(PAGE_PRIVATE_##flagname, &page_private(page)); \ - if (page_private(page) == BIT(PAGE_PRIVATE_NOT_POINTER)) { \ + if (page_private(page) == BIT(PAGE_PRIVATE_NOT_POINTER)) \ set_page_private(page, 0); \ - if (PagePrivate(page)) { \ - ClearPagePrivate(page); \ - put_page(page); \ - }\ - } \ } PAGE_PRIVATE_GET_FUNC(nonpointer, NOT_POINTER); PAGE_PRIVATE_GET_FUNC(inline, INLINE_INODE); PAGE_PRIVATE_GET_FUNC(gcing, ONGOING_MIGRATION); PAGE_PRIVATE_GET_FUNC(dummy, DUMMY_WRITE); +PAGE_PRIVATE_GET_FUNC(data, DATA); PAGE_PRIVATE_SET_FUNC(reference, REF_RESOURCE); PAGE_PRIVATE_SET_FUNC(inline, INLINE_INODE); PAGE_PRIVATE_SET_FUNC(gcing, ONGOING_MIGRATION); PAGE_PRIVATE_SET_FUNC(dummy, DUMMY_WRITE); +PAGE_PRIVATE_SET_FUNC(data, DATA); PAGE_PRIVATE_CLEAR_FUNC(reference, REF_RESOURCE); PAGE_PRIVATE_CLEAR_FUNC(inline, INLINE_INODE); PAGE_PRIVATE_CLEAR_FUNC(gcing, ONGOING_MIGRATION); PAGE_PRIVATE_CLEAR_FUNC(dummy, DUMMY_WRITE); +PAGE_PRIVATE_CLEAR_FUNC(data, DATA); -static inline unsigned long get_page_private_data(struct page *page) +static inline nid_t get_page_private_ino(struct page *page) { - unsigned long data = page_private(page); - - if (!test_bit(PAGE_PRIVATE_NOT_POINTER, &data)) + if (!page_private_data(page)) return 0; - return data >> PAGE_PRIVATE_MAX; + return page_private(page) >> PAGE_PRIVATE_MAX; } -static inline void set_page_private_data(struct page *page, unsigned long data) +static inline void set_page_private_ino(struct page *page, nid_t ino) { - if (!PagePrivate(page)) { - get_page(page); - SetPagePrivate(page); - set_page_private(page, 0); - } - set_bit(PAGE_PRIVATE_NOT_POINTER, &page_private(page)); - page_private(page) |= data << PAGE_PRIVATE_MAX; + set_page_private_data(page); + page_private(page) |= ino << PAGE_PRIVATE_MAX; } -static inline void clear_page_private_data(struct page *page) +static inline void clear_page_private_ino(struct page *page) { page_private(page) &= GENMASK(PAGE_PRIVATE_MAX - 1, 0); - if (page_private(page) == BIT(PAGE_PRIVATE_NOT_POINTER)) { - set_page_private(page, 0); - if (PagePrivate(page)) { - ClearPagePrivate(page); - put_page(page); - } - } + clear_page_private_data(page); } /* For compression */ -- 2.40.0.348.gf938b09366-goog _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
