libceph: use "do" in CRC-related Boolean variables
Change the name (and type) of a few CRC-related Boolean local
variables so they contain the word "do", to distingish their purpose
from variables used for holding an actual CRC value.
Note that in the process of doing this I identified a fairly serious
logic error in write_partial_msg_pages(): the value of "do_crc"
assigned appears to be the opposite of what it should be. No
attempt to fix this is made here; this change preserves the
erroneous behavior. The problem I found is documented here:
http://tracker.newdream.net/issues/2064
Signed-off-by: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 44d8c77..204e229 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -595,7 +595,7 @@
else
con->out_msg_pos.page_pos = 0;
con->out_msg_pos.data_pos = 0;
- con->out_msg_pos.did_page_crc = 0;
+ con->out_msg_pos.did_page_crc = false;
con->out_more = 1; /* data + footer will follow */
} else {
/* no, queue up footer too and be done */
@@ -805,7 +805,7 @@
struct ceph_msg *msg = con->out_msg;
unsigned data_len = le32_to_cpu(msg->hdr.data_len);
size_t len;
- int crc = con->msgr->nocrc;
+ bool do_crc = con->msgr->nocrc;
int ret;
int total_max_write;
int in_trail = 0;
@@ -843,17 +843,17 @@
page = list_first_entry(&msg->trail->head,
struct page, lru);
- if (crc)
+ if (do_crc)
kaddr = kmap(page);
max_write = PAGE_SIZE;
} else if (msg->pages) {
page = msg->pages[con->out_msg_pos.page];
- if (crc)
+ if (do_crc)
kaddr = kmap(page);
} else if (msg->pagelist) {
page = list_first_entry(&msg->pagelist->head,
struct page, lru);
- if (crc)
+ if (do_crc)
kaddr = kmap(page);
#ifdef CONFIG_BLOCK
} else if (msg->bio) {
@@ -862,26 +862,26 @@
bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
page = bv->bv_page;
page_shift = bv->bv_offset;
- if (crc)
+ if (do_crc)
kaddr = kmap(page) + page_shift;
max_write = bv->bv_len;
#endif
} else {
page = zero_page;
- if (crc)
+ if (do_crc)
kaddr = zero_page_address;
}
len = min_t(int, max_write - con->out_msg_pos.page_pos,
total_max_write);
- if (crc && !con->out_msg_pos.did_page_crc) {
+ if (do_crc && !con->out_msg_pos.did_page_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);
con->out_msg->footer.data_crc =
cpu_to_le32(crc32c(tmpcrc, base, len));
- con->out_msg_pos.did_page_crc = 1;
+ con->out_msg_pos.did_page_crc = true;
}
ret = kernel_sendpage(con->sock, page,
con->out_msg_pos.page_pos + page_shift,
@@ -889,7 +889,7 @@
MSG_DONTWAIT | MSG_NOSIGNAL |
MSG_MORE);
- if (crc &&
+ if (do_crc &&
(msg->pages || msg->pagelist || msg->bio || in_trail))
kunmap(page);
@@ -903,7 +903,7 @@
if (ret == len) {
con->out_msg_pos.page_pos = 0;
con->out_msg_pos.page++;
- con->out_msg_pos.did_page_crc = 0;
+ con->out_msg_pos.did_page_crc = false;
if (in_trail)
list_move_tail(&page->lru,
&msg->trail->head);
@@ -920,7 +920,7 @@
dout("write_partial_msg_pages %p msg %p done\n", con, msg);
/* prepare and queue up footer, too */
- if (!crc)
+ if (!do_crc)
con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
ceph_con_out_kvec_reset(con);
prepare_write_message_footer(con);
@@ -1557,7 +1557,7 @@
static int read_partial_message_pages(struct ceph_connection *con,
struct page **pages,
- unsigned data_len, int datacrc)
+ unsigned data_len, bool do_datacrc)
{
void *p;
int ret;
@@ -1570,7 +1570,7 @@
p = kmap(pages[con->in_msg_pos.page]);
ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
left);
- if (ret > 0 && datacrc)
+ if (ret > 0 && do_datacrc)
con->in_data_crc =
crc32c(con->in_data_crc,
p + con->in_msg_pos.page_pos, ret);
@@ -1590,7 +1590,7 @@
#ifdef CONFIG_BLOCK
static int read_partial_message_bio(struct ceph_connection *con,
struct bio **bio_iter, int *bio_seg,
- unsigned data_len, int datacrc)
+ unsigned data_len, bool do_datacrc)
{
struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
void *p;
@@ -1606,7 +1606,7 @@
ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
left);
- if (ret > 0 && datacrc)
+ if (ret > 0 && do_datacrc)
con->in_data_crc =
crc32c(con->in_data_crc,
p + con->in_msg_pos.page_pos, ret);
@@ -1633,7 +1633,7 @@
int ret;
int to, left;
unsigned front_len, middle_len, data_len;
- int datacrc = con->msgr->nocrc;
+ bool do_datacrc = con->msgr->nocrc;
int skip;
u64 seq;
@@ -1744,7 +1744,7 @@
while (con->in_msg_pos.data_pos < data_len) {
if (m->pages) {
ret = read_partial_message_pages(con, m->pages,
- data_len, datacrc);
+ data_len, do_datacrc);
if (ret <= 0)
return ret;
#ifdef CONFIG_BLOCK
@@ -1752,7 +1752,7 @@
ret = read_partial_message_bio(con,
&m->bio_iter, &m->bio_seg,
- data_len, datacrc);
+ data_len, do_datacrc);
if (ret <= 0)
return ret;
#endif
@@ -1787,7 +1787,7 @@
m, con->in_middle_crc, m->footer.middle_crc);
return -EBADMSG;
}
- if (datacrc &&
+ if (do_datacrc &&
(m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
pr_err("read_partial_message %p data crc %u != exp. %u\n", m,