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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>
This commit is contained in:
Alex Elder 2013-03-08 20:59:00 -06:00 committed by Sage Weil
parent afb3d90e20
commit 35b6280899
1 changed files with 20 additions and 27 deletions
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47
net/ceph/messenger.c
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@ -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);