9 static void ceph_pagelist_unmap_tail(struct ceph_pagelist *pl)  in ceph_pagelist_unmap_tail()  argument
11 	if (pl->mapped_tail) {  in ceph_pagelist_unmap_tail()
12 		struct page *page = list_entry(pl->head.prev, struct page, lru);  in ceph_pagelist_unmap_tail()
14 		pl->mapped_tail = NULL;  in ceph_pagelist_unmap_tail()
18 void ceph_pagelist_release(struct ceph_pagelist *pl)  in ceph_pagelist_release()  argument
20 	if (!refcount_dec_and_test(&pl->refcnt))  in ceph_pagelist_release()
22 	ceph_pagelist_unmap_tail(pl);  in ceph_pagelist_release()
23 	while (!list_empty(&pl->head)) {  in ceph_pagelist_release()
24 		struct page *page = list_first_entry(&pl->head, struct page,  in ceph_pagelist_release()
29 	ceph_pagelist_free_reserve(pl);  in ceph_pagelist_release()
30 	kfree(pl);  in ceph_pagelist_release()
34 static int ceph_pagelist_addpage(struct ceph_pagelist *pl)  in ceph_pagelist_addpage()  argument
38 	if (!pl->num_pages_free) {  in ceph_pagelist_addpage()
41 		page = list_first_entry(&pl->free_list, struct page, lru);  in ceph_pagelist_addpage()
43 		--pl->num_pages_free;  in ceph_pagelist_addpage()
47 	pl->room += PAGE_SIZE;  in ceph_pagelist_addpage()
48 	ceph_pagelist_unmap_tail(pl);  in ceph_pagelist_addpage()
49 	list_add_tail(&page->lru, &pl->head);  in ceph_pagelist_addpage()
50 	pl->mapped_tail = kmap(page);  in ceph_pagelist_addpage()
54 int ceph_pagelist_append(struct ceph_pagelist *pl, const void *buf, size_t len)  in ceph_pagelist_append()  argument
56 	while (pl->room < len) {  in ceph_pagelist_append()
57 		size_t bit = pl->room;  in ceph_pagelist_append()
60 		memcpy(pl->mapped_tail + (pl->length & ~PAGE_MASK),  in ceph_pagelist_append()
62 		pl->length += bit;  in ceph_pagelist_append()
63 		pl->room -= bit;  in ceph_pagelist_append()
66 		ret = ceph_pagelist_addpage(pl);  in ceph_pagelist_append()
71 	memcpy(pl->mapped_tail + (pl->length & ~PAGE_MASK), buf, len);  in ceph_pagelist_append()
72 	pl->length += len;  in ceph_pagelist_append()
73 	pl->room -= len;  in ceph_pagelist_append()
82 int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space)  in ceph_pagelist_reserve()  argument
84 	if (space <= pl->room)  in ceph_pagelist_reserve()
86 	space -= pl->room;  in ceph_pagelist_reserve()
89 	while (space > pl->num_pages_free) {  in ceph_pagelist_reserve()
93 		list_add_tail(&page->lru, &pl->free_list);  in ceph_pagelist_reserve()
94 		++pl->num_pages_free;  in ceph_pagelist_reserve()
101 int ceph_pagelist_free_reserve(struct ceph_pagelist *pl)  in ceph_pagelist_free_reserve()  argument
103 	while (!list_empty(&pl->free_list)) {  in ceph_pagelist_free_reserve()
104 		struct page *page = list_first_entry(&pl->free_list,  in ceph_pagelist_free_reserve()
108 		--pl->num_pages_free;  in ceph_pagelist_free_reserve()
110 	BUG_ON(pl->num_pages_free);  in ceph_pagelist_free_reserve()
116 void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,  in ceph_pagelist_set_cursor()  argument
119 	c->pl = pl;  in ceph_pagelist_set_cursor()
120 	c->page_lru = pl->head.prev;  in ceph_pagelist_set_cursor()
121 	c->room = pl->room;  in ceph_pagelist_set_cursor()
130 int ceph_pagelist_truncate(struct ceph_pagelist *pl,  in ceph_pagelist_truncate()  argument
135 	if (pl != c->pl)  in ceph_pagelist_truncate()
137 	ceph_pagelist_unmap_tail(pl);  in ceph_pagelist_truncate()
138 	while (pl->head.prev != c->page_lru) {  in ceph_pagelist_truncate()
139 		page = list_entry(pl->head.prev, struct page, lru);  in ceph_pagelist_truncate()
141 		list_move_tail(&page->lru, &pl->free_list);  in ceph_pagelist_truncate()
142 		++pl->num_pages_free;  in ceph_pagelist_truncate()
144 	pl->room = c->room;  in ceph_pagelist_truncate()
145 	if (!list_empty(&pl->head)) {  in ceph_pagelist_truncate()
146 		page = list_entry(pl->head.prev, struct page, lru);  in ceph_pagelist_truncate()
147 		pl->mapped_tail = kmap(page);  in ceph_pagelist_truncate()