From c35acef383f4a2f2cfc30a5d8d3b0d49a86a1f7f Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Wed, 24 Jan 2024 17:52:46 +0000 Subject: ubifs: Convert ubifs_writepage to use a folio We still pass the page down to do_writepage(), but ubifs_writepage() itself is now large folio safe. It also contains far fewer hidden calls to compound_head(). Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Zhihao Cheng Signed-off-by: Richard Weinberger --- fs/ubifs/file.c | 39 +++++++++++++++++---------------------- 1 file changed, 17 insertions(+), 22 deletions(-) (limited to 'fs/ubifs') diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c index 2022a31006df..a4e8bec6c03c 100644 --- a/fs/ubifs/file.c +++ b/fs/ubifs/file.c @@ -1004,21 +1004,18 @@ static int do_writepage(struct page *page, int len) static int ubifs_writepage(struct folio *folio, struct writeback_control *wbc, void *data) { - struct page *page = &folio->page; - struct inode *inode = page->mapping->host; + struct inode *inode = folio->mapping->host; struct ubifs_info *c = inode->i_sb->s_fs_info; struct ubifs_inode *ui = ubifs_inode(inode); loff_t i_size = i_size_read(inode), synced_i_size; - pgoff_t end_index = i_size >> PAGE_SHIFT; - int err, len = i_size & (PAGE_SIZE - 1); - void *kaddr; + int err, len = folio_size(folio); dbg_gen("ino %lu, pg %lu, pg flags %#lx", - inode->i_ino, page->index, page->flags); - ubifs_assert(c, PagePrivate(page)); + inode->i_ino, folio->index, folio->flags); + ubifs_assert(c, folio->private != NULL); - /* Is the page fully outside @i_size? (truncate in progress) */ - if (page->index > end_index || (page->index == end_index && !len)) { + /* Is the folio fully outside @i_size? (truncate in progress) */ + if (folio_pos(folio) >= i_size) { err = 0; goto out_unlock; } @@ -1027,9 +1024,9 @@ static int ubifs_writepage(struct folio *folio, struct writeback_control *wbc, synced_i_size = ui->synced_i_size; spin_unlock(&ui->ui_lock); - /* Is the page fully inside @i_size? */ - if (page->index < end_index) { - if (page->index >= synced_i_size >> PAGE_SHIFT) { + /* Is the folio fully inside i_size? */ + if (folio_pos(folio) + len <= i_size) { + if (folio_pos(folio) >= synced_i_size) { err = inode->i_sb->s_op->write_inode(inode, NULL); if (err) goto out_redirty; @@ -1042,20 +1039,18 @@ static int ubifs_writepage(struct folio *folio, struct writeback_control *wbc, * with this. */ } - return do_writepage(page, PAGE_SIZE); + return do_writepage(&folio->page, len); } /* - * The page straddles @i_size. It must be zeroed out on each and every + * The folio straddles @i_size. It must be zeroed out on each and every * writepage invocation because it may be mmapped. "A file is mapped * in multiples of the page size. For a file that is not a multiple of * the page size, the remaining memory is zeroed when mapped, and * writes to that region are not written out to the file." */ - kaddr = kmap_atomic(page); - memset(kaddr + len, 0, PAGE_SIZE - len); - flush_dcache_page(page); - kunmap_atomic(kaddr); + len = i_size - folio_pos(folio); + folio_zero_segment(folio, len, folio_size(folio)); if (i_size > synced_i_size) { err = inode->i_sb->s_op->write_inode(inode, NULL); @@ -1063,16 +1058,16 @@ static int ubifs_writepage(struct folio *folio, struct writeback_control *wbc, goto out_redirty; } - return do_writepage(page, len); + return do_writepage(&folio->page, len); out_redirty: /* - * redirty_page_for_writepage() won't call ubifs_dirty_inode() because + * folio_redirty_for_writepage() won't call ubifs_dirty_inode() because * it passes I_DIRTY_PAGES flag while calling __mark_inode_dirty(), so * there is no need to do space budget for dirty inode. */ - redirty_page_for_writepage(wbc, page); + folio_redirty_for_writepage(wbc, folio); out_unlock: - unlock_page(page); + folio_unlock(folio); return err; } -- cgit v1.2.3