From: Ilya Dryomov <idryomov@gmail.com>
Date: Fri, 28 Sep 2018 15:38:34 +0200
Subject: libceph: introduce ceph_pagelist_alloc()
Git-commit: 33165d472310262d8c79c7e4d1a17dc60cea7e35
Patch-mainline: v4.20-rc1
References: bsc#1135897

struct ceph_pagelist cannot be embedded into anything else because it
has its own refcount.  Merge allocation and initialization together.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/acl.c                 |    3 +--
 fs/ceph/mds_client.c          |    3 +--
 fs/ceph/xattr.c               |    3 +--
 include/linux/ceph/pagelist.h |   11 +----------
 net/ceph/osd_client.c         |   14 ++++----------
 net/ceph/pagelist.c           |   20 ++++++++++++++++++++
 6 files changed, 28 insertions(+), 26 deletions(-)

--- a/fs/ceph/acl.c
+++ b/fs/ceph/acl.c
@@ -206,10 +206,9 @@ int ceph_pre_init_acls(struct inode *dir
 	tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
 	if (!tmp_buf)
 		goto out_err;
-	pagelist = kmalloc(sizeof(struct ceph_pagelist), GFP_KERNEL);
+	pagelist = ceph_pagelist_alloc(GFP_KERNEL);
 	if (!pagelist)
 		goto out_err;
-	ceph_pagelist_init(pagelist);
 
 	err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
 	if (err)
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -3122,10 +3122,9 @@ static void send_mds_reconnect(struct ce
 
 	pr_info("mds%d reconnect start\n", mds);
 
-	pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
+	pagelist = ceph_pagelist_alloc(GFP_NOFS);
 	if (!pagelist)
 		goto fail_nopagelist;
-	ceph_pagelist_init(pagelist);
 
 	reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
 	if (!reply)
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -950,11 +950,10 @@ static int ceph_sync_setxattr(struct ino
 
 	if (size > 0) {
 		/* copy value into pagelist */
-		pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
+		pagelist = ceph_pagelist_alloc(GFP_NOFS);
 		if (!pagelist)
 			return -ENOMEM;
 
-		ceph_pagelist_init(pagelist);
 		err = ceph_pagelist_append(pagelist, value, size);
 		if (err)
 			goto out;
--- a/include/linux/ceph/pagelist.h
+++ b/include/linux/ceph/pagelist.h
@@ -22,16 +22,7 @@ struct ceph_pagelist_cursor {
 	size_t room;		    /* room remaining to reset to */
 };
 
-static inline void ceph_pagelist_init(struct ceph_pagelist *pl)
-{
-	INIT_LIST_HEAD(&pl->head);
-	pl->mapped_tail = NULL;
-	pl->length = 0;
-	pl->room = 0;
-	INIT_LIST_HEAD(&pl->free_list);
-	pl->num_pages_free = 0;
-	refcount_set(&pl->refcnt, 1);
-}
+struct ceph_pagelist *ceph_pagelist_alloc(gfp_t gfp_flags);
 
 extern void ceph_pagelist_release(struct ceph_pagelist *pl);
 
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -776,12 +776,10 @@ int osd_req_op_cls_init(struct ceph_osd_
 
 	BUG_ON(opcode != CEPH_OSD_OP_CALL);
 
-	pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
+	pagelist = ceph_pagelist_alloc(GFP_NOFS);
 	if (!pagelist)
 		return -ENOMEM;
 
-	ceph_pagelist_init(pagelist);
-
 	op->cls.class_name = class;
 	size = strlen(class);
 	BUG_ON(size > (size_t) U8_MAX);
@@ -814,12 +812,10 @@ int osd_req_op_xattr_init(struct ceph_os
 
 	BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
 
-	pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
+	pagelist = ceph_pagelist_alloc(GFP_NOFS);
 	if (!pagelist)
 		return -ENOMEM;
 
-	ceph_pagelist_init(pagelist);
-
 	payload_len = strlen(name);
 	op->xattr.name_len = payload_len;
 	ceph_pagelist_append(pagelist, name, payload_len);
@@ -4598,11 +4594,10 @@ static int osd_req_op_notify_ack_init(st
 
 	op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY_ACK, 0);
 
-	pl = kmalloc(sizeof(*pl), GFP_NOIO);
+	pl = ceph_pagelist_alloc(GFP_NOIO);
 	if (!pl)
 		return -ENOMEM;
 
-	ceph_pagelist_init(pl);
 	ret = ceph_pagelist_encode_64(pl, notify_id);
 	ret |= ceph_pagelist_encode_64(pl, cookie);
 	if (payload) {
@@ -4669,11 +4664,10 @@ static int osd_req_op_notify_init(struct
 	op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY, 0);
 	op->notify.cookie = cookie;
 
-	pl = kmalloc(sizeof(*pl), GFP_NOIO);
+	pl = ceph_pagelist_alloc(GFP_NOIO);
 	if (!pl)
 		return -ENOMEM;
 
-	ceph_pagelist_init(pl);
 	ret = ceph_pagelist_encode_32(pl, 1); /* prot_ver */
 	ret |= ceph_pagelist_encode_32(pl, timeout);
 	ret |= ceph_pagelist_encode_32(pl, payload_len);
--- a/net/ceph/pagelist.c
+++ b/net/ceph/pagelist.c
@@ -5,6 +5,26 @@
 #include <linux/highmem.h>
 #include <linux/ceph/pagelist.h>
 
+struct ceph_pagelist *ceph_pagelist_alloc(gfp_t gfp_flags)
+{
+	struct ceph_pagelist *pl;
+
+	pl = kmalloc(sizeof(*pl), gfp_flags);
+	if (!pl)
+		return NULL;
+
+	INIT_LIST_HEAD(&pl->head);
+	pl->mapped_tail = NULL;
+	pl->length = 0;
+	pl->room = 0;
+	INIT_LIST_HEAD(&pl->free_list);
+	pl->num_pages_free = 0;
+	refcount_set(&pl->refcnt, 1);
+
+	return pl;
+}
+EXPORT_SYMBOL(ceph_pagelist_alloc);
+
 static void ceph_pagelist_unmap_tail(struct ceph_pagelist *pl)
 {
 	if (pl->mapped_tail) {
