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From: Christoph Hellwig <hch@lst.de>
To: "Darrick J. Wong" <djwong@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>,
	Matthew Wilcox <willy@infradead.org>,
	Andreas Gruenbacher <agruenba@redhat.com>,
	Shiyang Ruan <ruansy.fnst@fujitsu.com>,
	linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-btrfs@vger.kernel.org, nvdimm@lists.linux.dev,
	cluster-devel@redhat.com
Subject: [PATCH 27/27] iomap: constify iomap_iter_srcmap
Date: Mon, 19 Jul 2021 12:35:20 +0200	[thread overview]
Message-ID: <20210719103520.495450-28-hch@lst.de> (raw)
In-Reply-To: <20210719103520.495450-1-hch@lst.de>

The srcmap returned from iomap_iter_srcmap is never modified, so mark
the iomap returned from it const and constify a lot of code that never
modifies the iomap.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/iomap/buffered-io.c | 32 ++++++++++++++++----------------
 include/linux/iomap.h  |  2 +-
 2 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index eb5d742b5bf8b7..a2dd42f3115cfa 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -226,20 +226,20 @@ iomap_read_inline_data(struct inode *inode, struct page *page,
 	SetPageUptodate(page);
 }
 
-static inline bool iomap_block_needs_zeroing(struct iomap_iter *iter,
+static inline bool iomap_block_needs_zeroing(const struct iomap_iter *iter,
 		loff_t pos)
 {
-	struct iomap *srcmap = iomap_iter_srcmap(iter);
+	const struct iomap *srcmap = iomap_iter_srcmap(iter);
 
 	return srcmap->type != IOMAP_MAPPED ||
 		(srcmap->flags & IOMAP_F_NEW) ||
 		pos >= i_size_read(iter->inode);
 }
 
-static loff_t iomap_readpage_iter(struct iomap_iter *iter,
+static loff_t iomap_readpage_iter(const struct iomap_iter *iter,
 		struct iomap_readpage_ctx *ctx, loff_t offset)
 {
-	struct iomap *iomap = &iter->iomap;
+	const struct iomap *iomap = &iter->iomap;
 	loff_t pos = iter->pos + offset;
 	loff_t length = iomap_length(iter) - offset;
 	struct page *page = ctx->cur_page;
@@ -355,7 +355,7 @@ iomap_readpage(struct page *page, const struct iomap_ops *ops)
 }
 EXPORT_SYMBOL_GPL(iomap_readpage);
 
-static loff_t iomap_readahead_iter(struct iomap_iter *iter,
+static loff_t iomap_readahead_iter(const struct iomap_iter *iter,
 		struct iomap_readpage_ctx *ctx)
 {
 	loff_t length = iomap_length(iter);
@@ -539,10 +539,10 @@ iomap_read_page_sync(loff_t block_start, struct page *page, unsigned poff,
 	return submit_bio_wait(&bio);
 }
 
-static int __iomap_write_begin(struct iomap_iter *iter, loff_t pos,
+static int __iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
 		unsigned len, struct page *page)
 {
-	struct iomap *srcmap = iomap_iter_srcmap(iter);
+	const struct iomap *srcmap = iomap_iter_srcmap(iter);
 	struct iomap_page *iop = iomap_page_create(iter->inode, page);
 	loff_t block_size = i_blocksize(iter->inode);
 	loff_t block_start = round_down(pos, block_size);
@@ -580,11 +580,11 @@ static int __iomap_write_begin(struct iomap_iter *iter, loff_t pos,
 	return 0;
 }
 
-static int iomap_write_begin(struct iomap_iter *iter, loff_t pos, unsigned len,
-		struct page **pagep)
+static int iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
+		unsigned len, struct page **pagep)
 {
 	const struct iomap_page_ops *page_ops = iter->iomap.page_ops;
-	struct iomap *srcmap = iomap_iter_srcmap(iter);
+	const struct iomap *srcmap = iomap_iter_srcmap(iter);
 	struct page *page;
 	int status = 0;
 
@@ -655,10 +655,10 @@ static size_t __iomap_write_end(struct inode *inode, loff_t pos, size_t len,
 	return copied;
 }
 
-static size_t iomap_write_end_inline(struct iomap_iter *iter, struct page *page,
-		loff_t pos, size_t copied)
+static size_t iomap_write_end_inline(const struct iomap_iter *iter,
+		struct page *page, loff_t pos, size_t copied)
 {
-	struct iomap *iomap = &iter->iomap;
+	const struct iomap *iomap = &iter->iomap;
 	void *addr;
 
 	WARN_ON_ONCE(!PageUptodate(page));
@@ -678,7 +678,7 @@ static size_t iomap_write_end(struct iomap_iter *iter, loff_t pos, size_t len,
 		size_t copied, struct page *page)
 {
 	const struct iomap_page_ops *page_ops = iter->iomap.page_ops;
-	struct iomap *srcmap = iomap_iter_srcmap(iter);
+	const struct iomap *srcmap = iomap_iter_srcmap(iter);
 	loff_t old_size = iter->inode->i_size;
 	size_t ret;
 
@@ -803,7 +803,7 @@ EXPORT_SYMBOL_GPL(iomap_file_buffered_write);
 static loff_t iomap_unshare_iter(struct iomap_iter *iter)
 {
 	struct iomap *iomap = &iter->iomap;
-	struct iomap *srcmap = iomap_iter_srcmap(iter);
+	const struct iomap *srcmap = iomap_iter_srcmap(iter);
 	loff_t pos = iter->pos;
 	loff_t length = iomap_length(iter);
 	long status = 0;
@@ -879,7 +879,7 @@ static s64 __iomap_zero_iter(struct iomap_iter *iter, loff_t pos, u64 length)
 static loff_t iomap_zero_iter(struct iomap_iter *iter, bool *did_zero)
 {
 	struct iomap *iomap = &iter->iomap;
-	struct iomap *srcmap = iomap_iter_srcmap(iter);
+	const struct iomap *srcmap = iomap_iter_srcmap(iter);
 	loff_t pos = iter->pos;
 	loff_t length = iomap_length(iter);
 	loff_t written = 0;
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 719798814bdfdb..a1fb0d22efbd40 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -193,7 +193,7 @@ static inline u64 iomap_length(const struct iomap_iter *iter)
  * for a given operation, which may or may no be identical to the destination
  * map in &i->iomap.
  */
-static inline struct iomap *iomap_iter_srcmap(struct iomap_iter *i)
+static inline const struct iomap *iomap_iter_srcmap(const struct iomap_iter *i)
 {
 	if (i->srcmap.type != IOMAP_HOLE)
 		return &i->srcmap;
-- 
2.30.2


  parent reply	other threads:[~2021-07-19 11:07 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19 10:34 RFC: switch iomap to an iterator model Christoph Hellwig
2021-07-19 10:34 ` [PATCH 01/27] iomap: fix a trivial comment typo in trace.h Christoph Hellwig
2021-07-19 16:00   ` Darrick J. Wong
2021-07-19 10:34 ` [PATCH 02/27] iomap: remove the iomap arguments to ->page_{prepare,done} Christoph Hellwig
2021-07-19 16:04   ` Darrick J. Wong
2021-07-19 10:34 ` [PATCH 03/27] iomap: mark the iomap argument to iomap_sector const Christoph Hellwig
2021-07-19 16:08   ` Darrick J. Wong
2021-07-20  9:52     ` Nikolay Borisov
2021-07-26  8:12     ` Christoph Hellwig
2021-07-19 10:34 ` [PATCH 04/27] fs: mark the iomap argument to __block_write_begin_int const Christoph Hellwig
2021-07-19 17:35   ` Darrick J. Wong
2021-07-19 10:34 ` [PATCH 05/27] fsdax: mark the iomap argument to dax_iomap_sector as const Christoph Hellwig
2021-07-19 17:35   ` Darrick J. Wong
2021-07-19 10:34 ` [PATCH 06/27] iomap: mark the iomap argument to iomap_read_inline_data const Christoph Hellwig
2021-07-19 17:35   ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 07/27] iomap: mark the iomap argument to iomap_read_page_sync const Christoph Hellwig
2021-07-19 17:35   ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 08/27] iomap: add the new iomap_iter model Christoph Hellwig
2021-07-19 16:56   ` Darrick J. Wong
2021-07-26  8:15     ` Christoph Hellwig
2021-07-19 21:48   ` Dave Chinner
2021-07-26  8:17     ` Christoph Hellwig
2021-07-19 10:35 ` [PATCH 09/27] iomap: switch readahead and readpage to use iomap_iter Christoph Hellwig
2021-07-19 10:35 ` [PATCH 10/27] iomap: switch iomap_file_buffered_write " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 11/27] iomap: switch iomap_file_unshare " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 12/27] iomap: switch iomap_zero_range " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 13/27] iomap: switch iomap_page_mkwrite " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 14/27] iomap: switch __iomap_dio_rw " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 15/27] iomap: switch iomap_fiemap " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 16/27] iomap: switch iomap_bmap " Christoph Hellwig
2021-07-19 17:05   ` Darrick J. Wong
2021-07-26  8:19     ` Christoph Hellwig
2021-07-26 16:39       ` Darrick J. Wong
2021-07-27  6:31         ` Christoph Hellwig
2021-07-27 14:32           ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 17/27] iomap: switch iomap_seek_hole " Christoph Hellwig
2021-07-19 17:22   ` Darrick J. Wong
2021-07-26  8:22     ` Christoph Hellwig
2021-07-26 16:41       ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 18/27] iomap: switch iomap_seek_data " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 19/27] iomap: switch iomap_swapfile_activate " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 20/27] fsdax: switch dax_iomap_rw " Christoph Hellwig
2021-07-19 22:10   ` Dave Chinner
2021-07-26  8:25     ` Christoph Hellwig
2021-07-19 10:35 ` [PATCH 21/27] iomap: remove iomap_apply Christoph Hellwig
2021-07-19 17:48   ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 22/27] iomap: pass an iomap_iter to various buffered I/O helpers Christoph Hellwig
2021-07-19 17:48   ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 23/27] iomap: rework unshare flag Christoph Hellwig
2021-07-19 17:44   ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 24/27] fsdax: factor out helpers to simplify the dax fault code Christoph Hellwig
2021-07-19 10:35 ` [PATCH 25/27] fsdax: factor out a dax_fault_actor() helper Christoph Hellwig
2021-07-19 10:35 ` [PATCH 26/27] fsdax: switch the fault handlers to use iomap_iter Christoph Hellwig
2021-07-19 17:35   ` Darrick J. Wong
2021-07-19 10:35 ` Christoph Hellwig [this message]
2021-07-19 17:44   ` [PATCH 27/27] iomap: constify iomap_iter_srcmap Darrick J. Wong
2021-07-19 17:57 ` RFC: switch iomap to an iterator model Darrick J. Wong
2021-07-27  8:07   ` DAX setup pains, was " Christoph Hellwig
2021-07-29 20:33 ` Darrick J. Wong

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