From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bombadil.infradead.org ([198.137.202.133]:43546 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752816AbeC3Dmz (ORCPT ); Thu, 29 Mar 2018 23:42:55 -0400 From: Matthew Wilcox To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Cc: Matthew Wilcox , Jan Kara , Jeff Layton , Lukas Czerner , Ross Zwisler , Christoph Hellwig , Goldwyn Rodrigues , Nicholas Piggin , Ryusuke Konishi , linux-nilfs@vger.kernel.org, Jaegeuk Kim , Chao Yu , linux-f2fs-devel@lists.sourceforge.net, Oleg Drokin , Andreas Dilger , James Simmons , Mike Kravetz Subject: [PATCH v10 36/62] shmem: Convert replace to XArray Date: Thu, 29 Mar 2018 20:42:19 -0700 Message-Id: <20180330034245.10462-37-willy@infradead.org> In-Reply-To: <20180330034245.10462-1-willy@infradead.org> References: <20180330034245.10462-1-willy@infradead.org> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: From: Matthew Wilcox shmem_radix_tree_replace() is renamed to shmem_xa_replace() and converted to use the XArray API. Signed-off-by: Matthew Wilcox --- mm/shmem.c | 22 ++++++++-------------- 1 file changed, 8 insertions(+), 14 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index 5cb52a797ea0..fced882e0b7a 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -321,24 +321,20 @@ void shmem_uncharge(struct inode *inode, long pages) } /* - * Replace item expected in radix tree by a new item, while holding tree lock. + * Replace item expected in xarray by a new item, while holding xa_lock. */ -static int shmem_radix_tree_replace(struct address_space *mapping, +static int shmem_xa_replace(struct address_space *mapping, pgoff_t index, void *expected, void *replacement) { - struct radix_tree_node *node; - void **pslot; + XA_STATE(xas, &mapping->i_pages, index); void *item; VM_BUG_ON(!expected); VM_BUG_ON(!replacement); - item = __radix_tree_lookup(&mapping->i_pages, index, &node, &pslot); - if (!item) - return -ENOENT; + item = xas_load(&xas); if (item != expected) return -ENOENT; - __radix_tree_replace(&mapping->i_pages, node, pslot, - replacement, NULL); + xas_store(&xas, replacement); return 0; } @@ -614,8 +610,7 @@ static int shmem_add_to_page_cache(struct page *page, } else if (!expected) { error = radix_tree_insert(&mapping->i_pages, index, page); } else { - error = shmem_radix_tree_replace(mapping, index, expected, - page); + error = shmem_xa_replace(mapping, index, expected, page); } if (!error) { @@ -644,7 +639,7 @@ static void shmem_delete_from_page_cache(struct page *page, void *radswap) VM_BUG_ON_PAGE(PageCompound(page), page); xa_lock_irq(&mapping->i_pages); - error = shmem_radix_tree_replace(mapping, page->index, page, radswap); + error = shmem_xa_replace(mapping, page->index, page, radswap); page->mapping = NULL; mapping->nrpages--; __dec_node_page_state(page, NR_FILE_PAGES); @@ -1562,8 +1557,7 @@ static int shmem_replace_page(struct page **pagep, gfp_t gfp, * a nice clean interface for us to replace oldpage by newpage there. */ xa_lock_irq(&swap_mapping->i_pages); - error = shmem_radix_tree_replace(swap_mapping, swap_index, oldpage, - newpage); + error = shmem_xa_replace(swap_mapping, swap_index, oldpage, newpage); if (!error) { __inc_node_page_state(newpage, NR_FILE_PAGES); __dec_node_page_state(oldpage, NR_FILE_PAGES); -- 2.16.2