Commit | Line | Data |
---|---|---|
58bb3b37 | 1 | |
5a0e3ad6 | 2 | #include <linux/gfp.h> |
58bb3b37 SW |
3 | #include <linux/pagemap.h> |
4 | #include <linux/highmem.h> | |
5 | ||
6 | #include "pagelist.h" | |
7 | ||
8 | int ceph_pagelist_release(struct ceph_pagelist *pl) | |
9 | { | |
10 | if (pl->mapped_tail) | |
11 | kunmap(pl->mapped_tail); | |
12 | while (!list_empty(&pl->head)) { | |
13 | struct page *page = list_first_entry(&pl->head, struct page, | |
14 | lru); | |
15 | list_del(&page->lru); | |
16 | __free_page(page); | |
17 | } | |
18 | return 0; | |
19 | } | |
20 | ||
21 | static int ceph_pagelist_addpage(struct ceph_pagelist *pl) | |
22 | { | |
23 | struct page *page = alloc_page(GFP_NOFS); | |
24 | if (!page) | |
25 | return -ENOMEM; | |
26 | pl->room += PAGE_SIZE; | |
27 | list_add_tail(&page->lru, &pl->head); | |
28 | if (pl->mapped_tail) | |
29 | kunmap(pl->mapped_tail); | |
30 | pl->mapped_tail = kmap(page); | |
31 | return 0; | |
32 | } | |
33 | ||
34 | int ceph_pagelist_append(struct ceph_pagelist *pl, void *buf, size_t len) | |
35 | { | |
36 | while (pl->room < len) { | |
37 | size_t bit = pl->room; | |
38 | int ret; | |
39 | ||
40 | memcpy(pl->mapped_tail + (pl->length & ~PAGE_CACHE_MASK), | |
41 | buf, bit); | |
42 | pl->length += bit; | |
43 | pl->room -= bit; | |
44 | buf += bit; | |
45 | len -= bit; | |
46 | ret = ceph_pagelist_addpage(pl); | |
47 | if (ret) | |
48 | return ret; | |
49 | } | |
50 | ||
51 | memcpy(pl->mapped_tail + (pl->length & ~PAGE_CACHE_MASK), buf, len); | |
52 | pl->length += len; | |
53 | pl->room -= len; | |
54 | return 0; | |
55 | } |