4.19-stable review patch. If anyone has any objections, please let me know.
------------------ From: Gao Xiang <[email protected]> commit b6391ac73400eff38377a4a7364bd3df5efb5178 upstream. Complete read error handling paths for all three kinds of compressed pages: 1) For cache-managed pages, PG_uptodate will be checked since read_endio will unlock and SetPageUptodate for these pages; 2) For inplaced pages, read_endio cannot SetPageUptodate directly since it should be used to mark the final decompressed data, PG_error will be set with page locked for IO error instead; 3) For staging pages, PG_error is used, which is similar to what we do for inplaced pages. Fixes: 3883a79abd02 ("staging: erofs: introduce VLE decompression support") Cc: <[email protected]> # 4.19+ Reviewed-by: Chao Yu <[email protected]> Signed-off-by: Gao Xiang <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/staging/erofs/unzip_vle.c | 42 ++++++++++++++++++++++++++------------ 1 file changed, 29 insertions(+), 13 deletions(-) --- a/drivers/staging/erofs/unzip_vle.c +++ b/drivers/staging/erofs/unzip_vle.c @@ -885,6 +885,7 @@ repeat: overlapped = false; compressed_pages = grp->compressed_pages; + err = 0; for (i = 0; i < clusterpages; ++i) { unsigned pagenr; @@ -894,26 +895,39 @@ repeat: DBG_BUGON(page == NULL); DBG_BUGON(page->mapping == NULL); - if (z_erofs_is_stagingpage(page)) - continue; + if (!z_erofs_is_stagingpage(page)) { #ifdef EROFS_FS_HAS_MANAGED_CACHE - if (page->mapping == mngda) { - DBG_BUGON(!PageUptodate(page)); - continue; - } + if (page->mapping == mngda) { + if (unlikely(!PageUptodate(page))) + err = -EIO; + continue; + } #endif - /* only non-head page could be reused as a compressed page */ - pagenr = z_erofs_onlinepage_index(page); + /* + * only if non-head page can be selected + * for inplace decompression + */ + pagenr = z_erofs_onlinepage_index(page); + + DBG_BUGON(pagenr >= nr_pages); + DBG_BUGON(pages[pagenr]); + ++sparsemem_pages; + pages[pagenr] = page; - DBG_BUGON(pagenr >= nr_pages); - DBG_BUGON(pages[pagenr]); - ++sparsemem_pages; - pages[pagenr] = page; + overlapped = true; + } - overlapped = true; + /* PG_error needs checking for inplaced and staging pages */ + if (unlikely(PageError(page))) { + DBG_BUGON(PageUptodate(page)); + err = -EIO; + } } + if (unlikely(err)) + goto out; + llen = (nr_pages << PAGE_SHIFT) - work->pageofs; if (z_erofs_vle_workgrp_fmt(grp) == Z_EROFS_VLE_WORKGRP_FMT_PLAIN) { @@ -1082,6 +1096,8 @@ static inline bool recover_managed_page( return true; lock_page(page); + ClearPageError(page); + if (unlikely(!PagePrivate(page))) { set_page_private(page, (unsigned long)grp); SetPagePrivate(page);
