fuse: convert retrieves to use folios

Convert retrieve requests to use folios instead of pages.

No functional changes.

Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

Author: joannekoong

fs/fuse/dev.c

@@ -1728,7 +1728,7 @@ static void fuse_retrieve_end(struct fuse_mount *fm, struct fuse_args *args,
 	struct fuse_retrieve_args *ra =
 		container_of(args, typeof(*ra), ap.args);
 
-	release_pages(ra->ap.pages, ra->ap.num_pages);
+	release_pages(ra->ap.folios, ra->ap.num_folios);
 	kfree(ra);
 }
 
@@ -1742,7 +1742,7 @@ static int fuse_retrieve(struct fuse_mount *fm, struct inode *inode,
 	unsigned int num;
 	unsigned int offset;
 	size_t total_len = 0;
-	unsigned int num_pages;
+	unsigned int num_pages, cur_pages = 0;
 	struct fuse_conn *fc = fm->fc;
 	struct fuse_retrieve_args *ra;
 	size_t args_size = sizeof(*ra);
@@ -1761,15 +1761,16 @@ static int fuse_retrieve(struct fuse_mount *fm, struct inode *inode,
 	num_pages = (num + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
 	num_pages = min(num_pages, fc->max_pages);
 
-	args_size += num_pages * (sizeof(ap->pages[0]) + sizeof(ap->descs[0]));
+	args_size += num_pages * (sizeof(ap->folios[0]) + sizeof(ap->folio_descs[0]));
 
 	ra = kzalloc(args_size, GFP_KERNEL);
 	if (!ra)
 		return -ENOMEM;
 
 	ap = &ra->ap;
-	ap->pages = (void *) (ra + 1);
-	ap->descs = (void *) (ap->pages + num_pages);
+	ap->folios = (void *) (ra + 1);
+	ap->folio_descs = (void *) (ap->folios + num_pages);
+	ap->uses_folios = true;
 
 	args = &ap->args;
 	args->nodeid = outarg->nodeid;
@@ -1780,7 +1781,7 @@ static int fuse_retrieve(struct fuse_mount *fm, struct inode *inode,
 
 	index = outarg->offset >> PAGE_SHIFT;
 
-	while (num && ap->num_pages < num_pages) {
+	while (num && cur_pages < num_pages) {
 		struct folio *folio;
 		unsigned int this_num;
 
@@ -1789,10 +1790,11 @@ static int fuse_retrieve(struct fuse_mount *fm, struct inode *inode,
 			break;
 
 		this_num = min_t(unsigned, num, PAGE_SIZE - offset);
-		ap->pages[ap->num_pages] = &folio->page;
-		ap->descs[ap->num_pages].offset = offset;
-		ap->descs[ap->num_pages].length = this_num;
-		ap->num_pages++;
+		ap->folios[ap->num_folios] = folio;
+		ap->folio_descs[ap->num_folios].offset = offset;
+		ap->folio_descs[ap->num_folios].length = this_num;
+		ap->num_folios++;
+		cur_pages++;
 
 		offset = 0;
 		num -= this_num;