diff mbox series

[v11,14/33] mm/filemap: Add folio_next_index()

Message ID	20210614201435.1379188-15-willy@infradead.org (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-fsdevel-owner@kernel.org> From: "Matthew Wilcox (Oracle)" <willy@infradead.org> To: akpm@linux-foundation.org Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>, Jeff Layton <jlayton@kernel.org>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, Vlastimil Babka <vbabka@suse.cz>, William Kucharski <william.kucharski@oracle.com> Subject: [PATCH v11 14/33] mm/filemap: Add folio_next_index() Date: Mon, 14 Jun 2021 21:14:16 +0100 Message-Id: <20210614201435.1379188-15-willy@infradead.org> In-Reply-To: <20210614201435.1379188-1-willy@infradead.org> References: <20210614201435.1379188-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	Memory folios \| expand [v11,00/33] Memory folios [v11,01/33] mm: Convert get_page_unless_zero() to return bool [v11,02/33] mm: Introduce struct folio [v11,03/33] mm: Add folio_pgdat(), folio_zone() and folio_zonenum() [v11,04/33] mm/vmstat: Add functions to account folio statistics [v11,05/33] mm/debug: Add VM_BUG_ON_FOLIO() and VM_WARN_ON_ONCE_FOLIO() [v11,06/33] mm: Add folio reference count functions [v11,07/33] mm: Add folio_put() [v11,08/33] mm: Add folio_get() [v11,09/33] mm: Add folio_try_get_rcu() [v11,10/33] mm: Add folio flag manipulation functions [v11,11/33] mm/lru: Add folio LRU functions [v11,12/33] mm: Handle per-folio private data [v11,13/33] mm/filemap: Add folio_index(), folio_file_page() and folio_contains() [v11,14/33] mm/filemap: Add folio_next_index() [v11,15/33] mm/filemap: Add folio_offset() and folio_file_offset() [v11,16/33] mm/util: Add folio_mapping() and folio_file_mapping() [v11,17/33] mm/memcg: Add folio wrappers for various functions [v11,18/33] mm/filemap: Add folio_unlock() [v11,19/33] mm/filemap: Add folio_lock() [v11,20/33] mm/filemap: Add folio_lock_killable() [v11,21/33] mm/filemap: Add __folio_lock_async() [v11,22/33] mm/filemap: Add folio_wait_locked() [v11,23/33] mm/filemap: Add __folio_lock_or_retry() [v11,24/33] mm/swap: Add folio_rotate_reclaimable() [v11,25/33] mm/filemap: Add folio_end_writeback() [v11,26/33] mm/writeback: Add folio_wait_writeback() [v11,27/33] mm/writeback: Add folio_wait_stable() [v11,28/33] mm/filemap: Add folio_wait_bit() [v11,29/33] mm/filemap: Add folio_wake_bit() [v11,30/33] mm/filemap: Convert page wait queues to be folios [v11,31/33] mm/filemap: Add folio private_2 functions [v11,32/33] fs/netfs: Add folio fscache functions [v11,33/33] mm: Add folio_mapped()

Commit Message

Matthew Wilcox (Oracle) June 14, 2021, 8:14 p.m. UTC

This helper returns the page index of the next folio in the file (ie
the end of this folio, plus one).

No changes to generated code.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
---
 include/linux/pagemap.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

Comments

David Howells June 16, 2021, 10:04 a.m. UTC | #1

Matthew Wilcox (Oracle) <willy@infradead.org> wrote:

> This helper returns the page index of the next folio in the file (ie
> the end of this folio, plus one).
> 
> No changes to generated code.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Acked-by: Jeff Layton <jlayton@kernel.org>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Acked-by: Vlastimil Babka <vbabka@suse.cz>
> Reviewed-by: William Kucharski <william.kucharski@oracle.com>

Reviewed-by: David Howells <dhowells@redhat.com>

diff mbox series

Patch

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 37a4b583abad..c5c7e061c77c 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -406,6 +406,17 @@  static inline pgoff_t folio_index(struct folio *folio)
         return folio->index;
 }
 
+/**
+ * folio_next_index - Get the index of the next folio.
+ * @folio: The current folio.
+ *
+ * Return: The index of the folio which follows this folio in the file.
+ */
+static inline pgoff_t folio_next_index(struct folio *folio)
+{
+	return folio->index + folio_nr_pages(folio);
+}
+
 /**
  * folio_file_page - The page for a particular index.
  * @folio: The folio which contains this index.