libceph: define osd data initialization helpers

Define and use functions that encapsulate the initializion of a
ceph_osd_data structure.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

drivers/block/rbd.c

@@ -1350,17 +1350,13 @@ static struct ceph_osd_request *rbd_osd_req_create(
 		break;		/* Nothing to do */
 	case OBJ_REQUEST_BIO:
 		rbd_assert(obj_request->bio_list != NULL);
-		osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
+		ceph_osd_data_bio_init(osd_data, obj_request->bio_list,
-		osd_data->bio = obj_request->bio_list;
+					obj_request->length);
-		osd_data->bio_length = obj_request->length;
 		break;
 	case OBJ_REQUEST_PAGES:
-		osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
+		ceph_osd_data_pages_init(osd_data, obj_request->pages,
-		osd_data->pages = obj_request->pages;
+				obj_request->length, offset & ~PAGE_MASK,
-		osd_data->length = obj_request->length;
+				false, false);
-		osd_data->alignment = offset & ~PAGE_MASK;
-		osd_data->pages_from_pool = false;
-		osd_data->own_pages = false;
 		break;
 	}
 

fs/ceph/addr.c

@@ -342,10 +342,8 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
 		}
 		pages[i] = page;
 	}
-	req->r_data_in.type = CEPH_OSD_DATA_TYPE_PAGES;
+	ceph_osd_data_pages_init(&req->r_data_in, pages, len, 0,
-	req->r_data_in.pages = pages;
+					false, false);
-	req->r_data_in.length = len;
-	req->r_data_in.alignment = 0;
 	req->r_callback = finish_read;
 	req->r_inode = inode;
 
@@ -917,11 +915,8 @@ get_more_pages:
 		dout("writepages got %d pages at %llu~%llu\n",
 		     locked_pages, offset, len);
 
-		req->r_data_out.type = CEPH_OSD_DATA_TYPE_PAGES;
+		ceph_osd_data_pages_init(&req->r_data_out, pages, len, 0,
-		req->r_data_out.pages = pages;
+						!!pool, false);
-		req->r_data_out.length = len;
-		req->r_data_out.alignment = 0;
-		req->r_data_out.pages_from_pool = !!pool;
 
 		pages = NULL;	/* request message now owns the pages array */
 		pool = NULL;

fs/ceph/file.c

@@ -491,6 +491,7 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
 	unsigned long buf_align;
 	int ret;
 	struct timespec mtime = CURRENT_TIME;
+	bool own_pages = false;
 
 	if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
 		return -EROFS;
@@ -571,14 +572,11 @@ more:
 		if ((file->f_flags & O_SYNC) == 0) {
 			/* get a second commit callback */
 			req->r_safe_callback = sync_write_commit;
-			req->r_data_out.own_pages = 1;
+			own_pages = true;
 		}
 	}
-	req->r_data_out.type = CEPH_OSD_DATA_TYPE_PAGES;
+	ceph_osd_data_pages_init(&req->r_data_out, pages, len, page_align,
-	req->r_data_out.pages = pages;
+					false, own_pages);
-	req->r_data_out.length = len;
-	req->r_data_out.alignment = page_align;
-	req->r_inode = inode;
 
 	/* BUG_ON(vino.snap != CEPH_NOSNAP); */
 	ceph_osdc_build_request(req, pos, num_ops, ops,

include/linux/ceph/osd_client.h

@@ -280,6 +280,17 @@ static inline void ceph_osdc_put_request(struct ceph_osd_request *req)
 	kref_put(&req->r_kref, ceph_osdc_release_request);
 }
 
+extern void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
+				     struct page **pages, u64 length,
+				     u32 alignment, bool pages_from_pool,
+				     bool own_pages);
+extern void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
+					struct ceph_pagelist *pagelist);
+#ifdef CONFIG_BLOCK
+extern void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
+				   struct bio *bio, size_t bio_length);
+#endif /* CONFIG_BLOCK */
+
 extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
 				   struct ceph_osd_request *req,
 				   bool nofail);

net/ceph/osd_client.c

@@ -79,6 +79,38 @@ static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
 	return 0;
 }
 
+void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
+			struct page **pages, u64 length, u32 alignment,
+			bool pages_from_pool, bool own_pages)
+{
+	osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
+	osd_data->pages = pages;
+	osd_data->length = length;
+	osd_data->alignment = alignment;
+	osd_data->pages_from_pool = pages_from_pool;
+	osd_data->own_pages = own_pages;
+}
+EXPORT_SYMBOL(ceph_osd_data_pages_init);
+
+void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
+			struct ceph_pagelist *pagelist)
+{
+	osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
+	osd_data->pagelist = pagelist;
+}
+EXPORT_SYMBOL(ceph_osd_data_pagelist_init);
+
+#ifdef CONFIG_BLOCK
+void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
+			struct bio *bio, size_t bio_length)
+{
+	osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
+	osd_data->bio = bio;
+	osd_data->bio_length = bio_length;
+}
+EXPORT_SYMBOL(ceph_osd_data_bio_init);
+#endif /* CONFIG_BLOCK */
+
 /*
  * requests
  */
@@ -400,8 +432,7 @@ static u64 osd_req_encode_op(struct ceph_osd_request *req,
 		ceph_pagelist_append(pagelist, src->cls.indata,
 				     src->cls.indata_len);
 
-		req->r_data_out.type = CEPH_OSD_DATA_TYPE_PAGELIST;
+		ceph_osd_data_pagelist_init(&req->r_data_out, pagelist);
-		req->r_data_out.pagelist = pagelist;
 		out_data_len = pagelist->length;
 		break;
 	case CEPH_OSD_OP_STARTSYNC:
@@ -2056,7 +2087,6 @@ int ceph_osdc_readpages(struct ceph_osd_client *osdc,
 			struct page **pages, int num_pages, int page_align)
 {
 	struct ceph_osd_request *req;
-	struct ceph_osd_data *osd_data;
 	struct ceph_osd_req_op op;
 	int rc = 0;
 
@@ -2071,14 +2101,11 @@ int ceph_osdc_readpages(struct ceph_osd_client *osdc,
 
 	/* it may be a short read due to an object boundary */
 
-	osd_data = &req->r_data_in;
+	ceph_osd_data_pages_init(&req->r_data_in, pages, *plen, page_align,
-	osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
+				false, false);
-	osd_data->pages = pages;
-	osd_data->length = *plen;
-	osd_data->alignment = page_align;
 
 	dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
-	     off, *plen, osd_data->length, page_align);
+	     off, *plen, *plen, page_align);
 
 	ceph_osdc_build_request(req, off, 1, &op, NULL, vino.snap, NULL);
 
@@ -2104,7 +2131,6 @@ int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
 			 struct page **pages, int num_pages)
 {
 	struct ceph_osd_request *req;
-	struct ceph_osd_data *osd_data;
 	struct ceph_osd_req_op op;
 	int rc = 0;
 	int page_align = off & ~PAGE_MASK;
@@ -2119,12 +2145,9 @@ int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
 		return PTR_ERR(req);
 
 	/* it may be a short write due to an object boundary */
-	osd_data = &req->r_data_out;
+	ceph_osd_data_pages_init(&req->r_data_out, pages, len, page_align,
-	osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
+				false, false);
-	osd_data->pages = pages;
+	dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
-	osd_data->length = len;
-	osd_data->alignment = page_align;
-	dout("writepages %llu~%llu (%llu bytes)\n", off, len, osd_data->length);
 
 	ceph_osdc_build_request(req, off, 1, &op, snapc, CEPH_NOSNAP, mtime);