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libceph: rename "page_shift" variable to something sensible

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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>
This commit is contained in:
Alex Elder 2012-03-07 11:40:08 -06:00
parent 0cdf9e6018
commit 9bd1966344
1 changed files with 6 additions and 5 deletions
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11
net/ceph/messenger.c
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@ -837,7 +837,7 @@ static int write_partial_msg_pages(struct ceph_connection *con)
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 @@ static int write_partial_msg_pages(struct ceph_connection *con)
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 @@ static int write_partial_msg_pages(struct ceph_connection *con)
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)