libceph: rename "page_shift" variable to something sensible
In write_partial_msg_pages() there is a local variable used to
track the starting offset within a bio segment to use. Its name,
"page_shift" defies the Linux convention of using that name for
log-base-2(page size).
Since it's only used in the bio case rename it "bio_offset". Use it
along with the page_pos field to compute the memory offset when
computing CRC's in that function. This makes the bio case match the
others more closely.
Signed-off-by: Alex Elder <elder@dreamhost.com>
Reviewed-by: Sage Weil <sage@newdream.net>
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 4f1714c..2bf9ab4 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -837,7 +837,7 @@
struct page *page = NULL;
void *kaddr = NULL;
int max_write = PAGE_SIZE;
- int page_shift = 0;
+ int bio_offset = 0;
total_max_write = data_len - trail_len -
con->out_msg_pos.data_pos;
@@ -874,9 +874,9 @@
bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
page = bv->bv_page;
- page_shift = bv->bv_offset;
+ bio_offset = bv->bv_offset;
if (do_datacrc)
- kaddr = kmap(page) + page_shift;
+ kaddr = kmap(page);
max_write = bv->bv_len;
#endif
} else {
@@ -888,17 +888,18 @@
total_max_write);
if (do_datacrc && !con->out_msg_pos.did_page_crc) {
+ void *base;
u32 crc;
- void *base = kaddr + con->out_msg_pos.page_pos;
u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
BUG_ON(kaddr == NULL);
+ base = kaddr + con->out_msg_pos.page_pos + bio_offset;
crc = crc32c(tmpcrc, base, len);
con->out_msg->footer.data_crc = cpu_to_le32(crc);
con->out_msg_pos.did_page_crc = true;
}
ret = ceph_tcp_sendpage(con->sock, page,
- con->out_msg_pos.page_pos + page_shift,
+ con->out_msg_pos.page_pos + bio_offset,
len, 1);
if (do_datacrc)