8 static void ceph_pagelist_unmap_tail(struct ceph_pagelist *pl)  in ceph_pagelist_unmap_tail()  argument
10 	if (pl->mapped_tail) {  in ceph_pagelist_unmap_tail()
11 		struct page *page = list_entry(pl->head.prev, struct page, lru);  in ceph_pagelist_unmap_tail()
13 		pl->mapped_tail = NULL;  in ceph_pagelist_unmap_tail()
17 void ceph_pagelist_release(struct ceph_pagelist *pl)  in ceph_pagelist_release()  argument
19 	if (!atomic_dec_and_test(&pl->refcnt))  in ceph_pagelist_release()
21 	ceph_pagelist_unmap_tail(pl);  in ceph_pagelist_release()
22 	while (!list_empty(&pl->head)) {  in ceph_pagelist_release()
23 		struct page *page = list_first_entry(&pl->head, struct page,  in ceph_pagelist_release()
28 	ceph_pagelist_free_reserve(pl);  in ceph_pagelist_release()
29 	kfree(pl);  in ceph_pagelist_release()
33 static int ceph_pagelist_addpage(struct ceph_pagelist *pl)  in ceph_pagelist_addpage()  argument
37 	if (!pl->num_pages_free) {  in ceph_pagelist_addpage()
40 		page = list_first_entry(&pl->free_list, struct page, lru);  in ceph_pagelist_addpage()
42 		--pl->num_pages_free;  in ceph_pagelist_addpage()
46 	pl->room += PAGE_SIZE;  in ceph_pagelist_addpage()
47 	ceph_pagelist_unmap_tail(pl);  in ceph_pagelist_addpage()
48 	list_add_tail(&page->lru, &pl->head);  in ceph_pagelist_addpage()
49 	pl->mapped_tail = kmap(page);  in ceph_pagelist_addpage()
53 int ceph_pagelist_append(struct ceph_pagelist *pl, const void *buf, size_t len)  in ceph_pagelist_append()  argument
55 	while (pl->room < len) {  in ceph_pagelist_append()
56 		size_t bit = pl->room;  in ceph_pagelist_append()
59 		memcpy(pl->mapped_tail + (pl->length & ~PAGE_CACHE_MASK),  in ceph_pagelist_append()
61 		pl->length += bit;  in ceph_pagelist_append()
62 		pl->room -= bit;  in ceph_pagelist_append()
65 		ret = ceph_pagelist_addpage(pl);  in ceph_pagelist_append()
70 	memcpy(pl->mapped_tail + (pl->length & ~PAGE_CACHE_MASK), buf, len);  in ceph_pagelist_append()
71 	pl->length += len;  in ceph_pagelist_append()
72 	pl->room -= len;  in ceph_pagelist_append()
81 int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space)  in ceph_pagelist_reserve()  argument
83 	if (space <= pl->room)  in ceph_pagelist_reserve()
85 	space -= pl->room;  in ceph_pagelist_reserve()
88 	while (space > pl->num_pages_free) {  in ceph_pagelist_reserve()
92 		list_add_tail(&page->lru, &pl->free_list);  in ceph_pagelist_reserve()
93 		++pl->num_pages_free;  in ceph_pagelist_reserve()
100 int ceph_pagelist_free_reserve(struct ceph_pagelist *pl)  in ceph_pagelist_free_reserve()  argument
102 	while (!list_empty(&pl->free_list)) {  in ceph_pagelist_free_reserve()
103 		struct page *page = list_first_entry(&pl->free_list,  in ceph_pagelist_free_reserve()
107 		--pl->num_pages_free;  in ceph_pagelist_free_reserve()
109 	BUG_ON(pl->num_pages_free);  in ceph_pagelist_free_reserve()
115 void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,  in ceph_pagelist_set_cursor()  argument
118 	c->pl = pl;  in ceph_pagelist_set_cursor()
119 	c->page_lru = pl->head.prev;  in ceph_pagelist_set_cursor()
120 	c->room = pl->room;  in ceph_pagelist_set_cursor()
129 int ceph_pagelist_truncate(struct ceph_pagelist *pl,  in ceph_pagelist_truncate()  argument
134 	if (pl != c->pl)  in ceph_pagelist_truncate()
136 	ceph_pagelist_unmap_tail(pl);  in ceph_pagelist_truncate()
137 	while (pl->head.prev != c->page_lru) {  in ceph_pagelist_truncate()
138 		page = list_entry(pl->head.prev, struct page, lru);  in ceph_pagelist_truncate()
140 		list_move_tail(&page->lru, &pl->free_list);  in ceph_pagelist_truncate()
141 		++pl->num_pages_free;  in ceph_pagelist_truncate()
143 	pl->room = c->room;  in ceph_pagelist_truncate()
144 	if (!list_empty(&pl->head)) {  in ceph_pagelist_truncate()
145 		page = list_entry(pl->head.prev, struct page, lru);  in ceph_pagelist_truncate()
146 		pl->mapped_tail = kmap(page);  in ceph_pagelist_truncate()