11 	struct ceph_pagelist *pl;  in ceph_pagelist_alloc()  local
13 	pl = kmalloc(sizeof(*pl), gfp_flags);  in ceph_pagelist_alloc()
14 	if (!pl)  in ceph_pagelist_alloc()
17 	INIT_LIST_HEAD(&pl->head);  in ceph_pagelist_alloc()
18 	pl->mapped_tail = NULL;  in ceph_pagelist_alloc()
19 	pl->length = 0;  in ceph_pagelist_alloc()
20 	pl->room = 0;  in ceph_pagelist_alloc()
21 	INIT_LIST_HEAD(&pl->free_list);  in ceph_pagelist_alloc()
22 	pl->num_pages_free = 0;  in ceph_pagelist_alloc()
23 	refcount_set(&pl->refcnt, 1);  in ceph_pagelist_alloc()
25 	return pl;  in ceph_pagelist_alloc()
29 static void ceph_pagelist_unmap_tail(struct ceph_pagelist *pl)  in ceph_pagelist_unmap_tail()  argument
31 	if (pl->mapped_tail) {  in ceph_pagelist_unmap_tail()
32 		struct page *page = list_entry(pl->head.prev, struct page, lru);  in ceph_pagelist_unmap_tail()
34 		pl->mapped_tail = NULL;  in ceph_pagelist_unmap_tail()
38 void ceph_pagelist_release(struct ceph_pagelist *pl)  in ceph_pagelist_release()  argument
40 	if (!refcount_dec_and_test(&pl->refcnt))  in ceph_pagelist_release()
42 	ceph_pagelist_unmap_tail(pl);  in ceph_pagelist_release()
43 	while (!list_empty(&pl->head)) {  in ceph_pagelist_release()
44 		struct page *page = list_first_entry(&pl->head, struct page,  in ceph_pagelist_release()
49 	ceph_pagelist_free_reserve(pl);  in ceph_pagelist_release()
50 	kfree(pl);  in ceph_pagelist_release()
54 static int ceph_pagelist_addpage(struct ceph_pagelist *pl)  in ceph_pagelist_addpage()  argument
58 	if (!pl->num_pages_free) {  in ceph_pagelist_addpage()
61 		page = list_first_entry(&pl->free_list, struct page, lru);  in ceph_pagelist_addpage()
63 		--pl->num_pages_free;  in ceph_pagelist_addpage()
67 	pl->room += PAGE_SIZE;  in ceph_pagelist_addpage()
68 	ceph_pagelist_unmap_tail(pl);  in ceph_pagelist_addpage()
69 	list_add_tail(&page->lru, &pl->head);  in ceph_pagelist_addpage()
70 	pl->mapped_tail = kmap(page);  in ceph_pagelist_addpage()
74 int ceph_pagelist_append(struct ceph_pagelist *pl, const void *buf, size_t len)  in ceph_pagelist_append()  argument
76 	while (pl->room < len) {  in ceph_pagelist_append()
77 		size_t bit = pl->room;  in ceph_pagelist_append()
80 		memcpy(pl->mapped_tail + (pl->length & ~PAGE_MASK),  in ceph_pagelist_append()
82 		pl->length += bit;  in ceph_pagelist_append()
83 		pl->room -= bit;  in ceph_pagelist_append()
86 		ret = ceph_pagelist_addpage(pl);  in ceph_pagelist_append()
91 	memcpy(pl->mapped_tail + (pl->length & ~PAGE_MASK), buf, len);  in ceph_pagelist_append()
92 	pl->length += len;  in ceph_pagelist_append()
93 	pl->room -= len;  in ceph_pagelist_append()
102 int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space)  in ceph_pagelist_reserve()  argument
104 	if (space <= pl->room)  in ceph_pagelist_reserve()
106 	space -= pl->room;  in ceph_pagelist_reserve()
109 	while (space > pl->num_pages_free) {  in ceph_pagelist_reserve()
113 		list_add_tail(&page->lru, &pl->free_list);  in ceph_pagelist_reserve()
114 		++pl->num_pages_free;  in ceph_pagelist_reserve()
121 int ceph_pagelist_free_reserve(struct ceph_pagelist *pl)  in ceph_pagelist_free_reserve()  argument
123 	while (!list_empty(&pl->free_list)) {  in ceph_pagelist_free_reserve()
124 		struct page *page = list_first_entry(&pl->free_list,  in ceph_pagelist_free_reserve()
128 		--pl->num_pages_free;  in ceph_pagelist_free_reserve()
130 	BUG_ON(pl->num_pages_free);  in ceph_pagelist_free_reserve()
136 void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,  in ceph_pagelist_set_cursor()  argument
139 	c->pl = pl;  in ceph_pagelist_set_cursor()
140 	c->page_lru = pl->head.prev;  in ceph_pagelist_set_cursor()
141 	c->room = pl->room;  in ceph_pagelist_set_cursor()
150 int ceph_pagelist_truncate(struct ceph_pagelist *pl,  in ceph_pagelist_truncate()  argument
155 	if (pl != c->pl)  in ceph_pagelist_truncate()
157 	ceph_pagelist_unmap_tail(pl);  in ceph_pagelist_truncate()
158 	while (pl->head.prev != c->page_lru) {  in ceph_pagelist_truncate()
159 		page = list_entry(pl->head.prev, struct page, lru);  in ceph_pagelist_truncate()
161 		list_move_tail(&page->lru, &pl->free_list);  in ceph_pagelist_truncate()
162 		++pl->num_pages_free;  in ceph_pagelist_truncate()
164 	pl->room = c->room;  in ceph_pagelist_truncate()
165 	if (!list_empty(&pl->head)) {  in ceph_pagelist_truncate()
166 		page = list_entry(pl->head.prev, struct page, lru);  in ceph_pagelist_truncate()
167 		pl->mapped_tail = kmap(page);  in ceph_pagelist_truncate()