diff options
| author | Alex Elder <elder@inktank.com> | 2013-03-08 20:59:00 -0600 |
|---|---|---|
| committer | Sage Weil <sage@inktank.com> | 2013-05-01 21:16:52 -0700 |
| commit | 35b6280899424a0faf5410ce1ee86f9682528e6c (patch) | |
| tree | e139fb767345c9bb09a8ea884fc7bb3303c867bc /net | |
| parent | afb3d90e205140415477d501ff9e2a33ff0b197f (diff) | |
libceph: define and use ceph_crc32c_page()
Factor out a common block of code that updates a CRC calculation
over a range of data in a page.
This and the preceding patches are related to:
http://tracker.ceph.com/issues/4403
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ceph/messenger.c | 47 |
1 files changed, 20 insertions, 27 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index 3120a6c81a7..f70bc92348d 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -1085,6 +1085,19 @@ static void in_msg_pos_next(struct ceph_connection *con, size_t len, #endif /* CONFIG_BLOCK */ } +static u32 ceph_crc32c_page(u32 crc, struct page *page, + unsigned int page_offset, + unsigned int length) +{ + char *kaddr; + + kaddr = kmap(page); + BUG_ON(kaddr == NULL); + crc = crc32c(crc, kaddr + page_offset, length); + kunmap(page); + + return crc; +} /* * Write as much message data payload as we can. If we finish, queue * up the footer. @@ -1153,15 +1166,9 @@ static int write_partial_message_data(struct ceph_connection *con) page_offset = msg_pos->page_pos + bio_offset; if (do_datacrc && !msg_pos->did_page_crc) { - void *base; u32 crc = le32_to_cpu(msg->footer.data_crc); - char *kaddr; - kaddr = kmap(page); - BUG_ON(kaddr == NULL); - base = kaddr + page_offset; - crc = crc32c(crc, base, length); - kunmap(page); + crc = ceph_crc32c_page(crc, page, page_offset, length); msg->footer.data_crc = cpu_to_le32(crc); msg_pos->did_page_crc = true; } @@ -1843,16 +1850,9 @@ static int read_partial_message_pages(struct ceph_connection *con, if (ret <= 0) return ret; - if (do_datacrc) { - void *kaddr; - void *base; - - kaddr = kmap(page); - BUG_ON(!kaddr); - base = kaddr + page_offset; - con->in_data_crc = crc32c(con->in_data_crc, base, ret); - kunmap(page); - } + if (do_datacrc) + con->in_data_crc = ceph_crc32c_page(con->in_data_crc, page, + page_offset, ret); in_msg_pos_next(con, length, ret); @@ -1886,16 +1886,9 @@ static int read_partial_message_bio(struct ceph_connection *con, if (ret <= 0) return ret; - if (do_datacrc) { - void *kaddr; - void *base; - - kaddr = kmap(page); - BUG_ON(!kaddr); - base = kaddr + page_offset; - con->in_data_crc = crc32c(con->in_data_crc, base, ret); - kunmap(page); - } + if (do_datacrc) + con->in_data_crc = ceph_crc32c_page(con->in_data_crc, page, + page_offset, ret); in_msg_pos_next(con, length, ret); |