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author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-03-22 20:23:46 +0300 |
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committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-03-22 20:23:46 +0300 |
commit | 74511020dde10252f8b8e648690d99dba721de14 (patch) | |
tree | 04fc22bc7dd5d5b8d9294b2e57985b093858bd84 /fs/ceph/pagelist.c | |
parent | 69266866a5790080d7fe80094b28d670ff8aa765 (diff) | |
parent | 3cc4e53f86dab635166929bfa47cc68d59b28c26 (diff) | |
download | linux-74511020dde10252f8b8e648690d99dba721de14.tar.xz |
Merge branch 'for-2.6.34' into for-2.6.35
Diffstat (limited to 'fs/ceph/pagelist.c')
-rw-r--r-- | fs/ceph/pagelist.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/fs/ceph/pagelist.c b/fs/ceph/pagelist.c new file mode 100644 index 000000000000..370e93695474 --- /dev/null +++ b/fs/ceph/pagelist.c @@ -0,0 +1,54 @@ + +#include <linux/pagemap.h> +#include <linux/highmem.h> + +#include "pagelist.h" + +int ceph_pagelist_release(struct ceph_pagelist *pl) +{ + if (pl->mapped_tail) + kunmap(pl->mapped_tail); + while (!list_empty(&pl->head)) { + struct page *page = list_first_entry(&pl->head, struct page, + lru); + list_del(&page->lru); + __free_page(page); + } + return 0; +} + +static int ceph_pagelist_addpage(struct ceph_pagelist *pl) +{ + struct page *page = alloc_page(GFP_NOFS); + if (!page) + return -ENOMEM; + pl->room += PAGE_SIZE; + list_add_tail(&page->lru, &pl->head); + if (pl->mapped_tail) + kunmap(pl->mapped_tail); + pl->mapped_tail = kmap(page); + return 0; +} + +int ceph_pagelist_append(struct ceph_pagelist *pl, void *buf, size_t len) +{ + while (pl->room < len) { + size_t bit = pl->room; + int ret; + + memcpy(pl->mapped_tail + (pl->length & ~PAGE_CACHE_MASK), + buf, bit); + pl->length += bit; + pl->room -= bit; + buf += bit; + len -= bit; + ret = ceph_pagelist_addpage(pl); + if (ret) + return ret; + } + + memcpy(pl->mapped_tail + (pl->length & ~PAGE_CACHE_MASK), buf, len); + pl->length += len; + pl->room -= len; + return 0; +} |