ceph: use __page_cache_alloc and add_to_page_cache_lru

Following Nick Piggin patches in btrfs, pagecache pages should be
allocated with __page_cache_alloc, so they obey pagecache memory
policies.

Also, using add_to_page_cache_lru instead of using a private
pagevec where applicable.
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/addr.c

@@ -274,7 +274,6 @@ static int ceph_readpages(struct file *file, struct address_space *mapping,
 	struct ceph_osd_client *osdc = &ceph_inode_to_client(inode)->osdc;
 	int rc = 0;
 	struct page **pages;
-	struct pagevec pvec;
 	loff_t offset;
 	u64 len;
 
@@ -297,8 +296,6 @@ static int ceph_readpages(struct file *file, struct address_space *mapping,
 	if (rc < 0)
 		goto out;
 
-	/* set uptodate and add to lru in pagevec-sized chunks */
-	pagevec_init(&pvec, 0);
 	for (; !list_empty(page_list) && len > 0;
 	     rc -= PAGE_CACHE_SIZE, len -= PAGE_CACHE_SIZE) {
 		struct page *page =
@@ -312,7 +309,7 @@ static int ceph_readpages(struct file *file, struct address_space *mapping,
 			zero_user_segment(page, s, PAGE_CACHE_SIZE);
 		}
 
-		if (add_to_page_cache(page, mapping, page->index, GFP_NOFS)) {
+		if (add_to_page_cache_lru(page, mapping, page->index, GFP_NOFS)) {
 			page_cache_release(page);
 			dout("readpages %p add_to_page_cache failed %p\n",
 			     inode, page);
@@ -323,10 +320,8 @@ static int ceph_readpages(struct file *file, struct address_space *mapping,
 		flush_dcache_page(page);
 		SetPageUptodate(page);
 		unlock_page(page);
-		if (pagevec_add(&pvec, page) == 0)
-			pagevec_lru_add_file(&pvec);   /* add to lru */
+		page_cache_release(page);
 	}
-	pagevec_lru_add_file(&pvec);
 	rc = 0;
 
 out:

fs/ceph/file.c

@@ -326,7 +326,7 @@ static struct page **alloc_page_vector(int num_pages)
 	if (!pages)
 		return ERR_PTR(-ENOMEM);
 	for (i = 0; i < num_pages; i++) {
-		pages[i] = alloc_page(GFP_NOFS);
+		pages[i] = __page_cache_alloc(GFP_NOFS);
 		if (pages[i] == NULL) {
 			ceph_release_page_vector(pages, i);
 			return ERR_PTR(-ENOMEM);

fs/ceph/messenger.c

@@ -1947,7 +1947,7 @@ struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr)
 
 	/* the zero page is needed if a request is "canceled" while the message
 	 * is being written over the socket */
-	msgr->zero_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+	msgr->zero_page = __page_cache_alloc(GFP_KERNEL | __GFP_ZERO);
 	if (!msgr->zero_page) {
 		kfree(msgr);
 		return ERR_PTR(-ENOMEM);

fs/ceph/pagelist.c

@@ -20,7 +20,7 @@ int ceph_pagelist_release(struct ceph_pagelist *pl)
 
 static int ceph_pagelist_addpage(struct ceph_pagelist *pl)
 {
-	struct page *page = alloc_page(GFP_NOFS);
+	struct page *page = __page_cache_alloc(GFP_NOFS);
 	if (!page)
 		return -ENOMEM;
 	pl->room += PAGE_SIZE;

fs/ceph/xattr.c

@@ -641,7 +641,7 @@ static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
 			return -ENOMEM;
 		err = -ENOMEM;
 		for (i = 0; i < nr_pages; i++) {
-			pages[i] = alloc_page(GFP_NOFS);
+			pages[i] = __page_cache_alloc(GFP_NOFS);
 			if (!pages[i]) {
 				nr_pages = i;
 				goto out;