linux-kernel - [PATCH 01/15] mm/filemap: change filemap_create

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Message-ID: <20241110152906.1747545-2-axboe@kernel.dk>
Date: Sun, 10 Nov 2024 08:27:53 -0700
From: Jens Axboe <axboe@...nel.dk>
To: linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Cc: hannes@...xchg.org,
	clm@...a.com,
	linux-kernel@...r.kernel.org,
	willy@...radead.org,
	Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 01/15] mm/filemap: change filemap_create_folio() to take a struct kiocb

Rather than pass in both the file and position directly from the kiocb,
just take a struct kiocb instead. While doing so, move the ki_flags
checking into filemap_create_folio() as well. In preparation for actually
needing the kiocb in the function.

No functional changes in this patch.

Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 mm/filemap.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 36d22968be9a..0b187938b999 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2460,15 +2460,17 @@ static int filemap_update_page(struct kiocb *iocb,
 	return error;
 }
 
-static int filemap_create_folio(struct file *file,
-		struct address_space *mapping, loff_t pos,
-		struct folio_batch *fbatch)
+static int filemap_create_folio(struct kiocb *iocb,
+		struct address_space *mapping, struct folio_batch *fbatch)
 {
 	struct folio *folio;
 	int error;
 	unsigned int min_order = mapping_min_folio_order(mapping);
 	pgoff_t index;
 
+	if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_WAITQ))
+		return -EAGAIN;
+
 	folio = filemap_alloc_folio(mapping_gfp_mask(mapping), min_order);
 	if (!folio)
 		return -ENOMEM;
@@ -2487,7 +2489,7 @@ static int filemap_create_folio(struct file *file,
 	 * well to keep locking rules simple.
 	 */
 	filemap_invalidate_lock_shared(mapping);
-	index = (pos >> (PAGE_SHIFT + min_order)) << min_order;
+	index = (iocb->ki_pos >> (PAGE_SHIFT + min_order)) << min_order;
 	error = filemap_add_folio(mapping, folio, index,
 			mapping_gfp_constraint(mapping, GFP_KERNEL));
 	if (error == -EEXIST)
@@ -2495,7 +2497,8 @@ static int filemap_create_folio(struct file *file,
 	if (error)
 		goto error;
 
-	error = filemap_read_folio(file, mapping->a_ops->read_folio, folio);
+	error = filemap_read_folio(iocb->ki_filp, mapping->a_ops->read_folio,
+					folio);
 	if (error)
 		goto error;
 
@@ -2551,9 +2554,7 @@ static int filemap_get_pages(struct kiocb *iocb, size_t count,
 		filemap_get_read_batch(mapping, index, last_index - 1, fbatch);
 	}
 	if (!folio_batch_count(fbatch)) {
-		if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_WAITQ))
-			return -EAGAIN;
-		err = filemap_create_folio(filp, mapping, iocb->ki_pos, fbatch);
+		err = filemap_create_folio(iocb, mapping, fbatch);
 		if (err == AOP_TRUNCATED_PAGE)
 			goto retry;
 		return err;
-- 
2.45.2