This is a note to let you know that I've just added the patch titled
libceph: small changes to messenger.c
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
0078-libceph-small-changes-to-messenger.c.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 2203e5cd059ff4aeafebaf4c4efeca850841794e Mon Sep 17 00:00:00 2001
From: Alex Elder <[email protected]>
Date: Mon, 11 Jun 2012 14:57:13 -0500
Subject: libceph: small changes to messenger.c
From: Alex Elder <[email protected]>
(cherry picked from commit 5821bd8ccdf5d17ab2c391c773756538603838c3)
This patch gathers a few small changes in "net/ceph/messenger.c":
out_msg_pos_next()
- small logic change that mostly affects indentation
write_partial_msg_pages().
- use a local variable trail_off to represent the offset into
a message of the trail portion of the data (if present)
- once we are in the trail portion we will always be there, so we
don't always need to check against our data position
- avoid computing len twice after we've reached the trail
- get rid of the variable tmpcrc, which is not needed
- trail_off and trail_len never change so mark them const
- update some comments
read_partial_message_bio()
- bio_iovec_idx() will never return an error, so don't bother
checking for it
Signed-off-by: Alex Elder <[email protected]>
Reviewed-by: Sage Weil <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/ceph/messenger.c | 63 +++++++++++++++++++++++++--------------------------
1 file changed, 31 insertions(+), 32 deletions(-)
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -907,21 +907,23 @@ static void out_msg_pos_next(struct ceph
con->out_msg_pos.data_pos += sent;
con->out_msg_pos.page_pos += sent;
- if (sent == len) {
- con->out_msg_pos.page_pos = 0;
- con->out_msg_pos.page++;
- con->out_msg_pos.did_page_crc = false;
- if (in_trail)
- list_move_tail(&page->lru,
- &msg->trail->head);
- else if (msg->pagelist)
- list_move_tail(&page->lru,
- &msg->pagelist->head);
+ if (sent < len)
+ return;
+
+ BUG_ON(sent != len);
+ con->out_msg_pos.page_pos = 0;
+ con->out_msg_pos.page++;
+ con->out_msg_pos.did_page_crc = false;
+ if (in_trail)
+ list_move_tail(&page->lru,
+ &msg->trail->head);
+ else if (msg->pagelist)
+ list_move_tail(&page->lru,
+ &msg->pagelist->head);
#ifdef CONFIG_BLOCK
- else if (msg->bio)
- iter_bio_next(&msg->bio_iter, &msg->bio_seg);
+ else if (msg->bio)
+ iter_bio_next(&msg->bio_iter, &msg->bio_seg);
#endif
- }
}
/*
@@ -940,30 +942,31 @@ static int write_partial_msg_pages(struc
int ret;
int total_max_write;
bool in_trail = false;
- size_t trail_len = (msg->trail ? msg->trail->length : 0);
+ const size_t trail_len = (msg->trail ? msg->trail->length : 0);
+ const size_t trail_off = data_len - trail_len;
dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
con, msg, con->out_msg_pos.page, msg->nr_pages,
con->out_msg_pos.page_pos);
+ /*
+ * Iterate through each page that contains data to be
+ * written, and send as much as possible for each.
+ *
+ * If we are calculating the data crc (the default), we will
+ * need to map the page. If we have no pages, they have
+ * been revoked, so use the zero page.
+ */
while (data_len > con->out_msg_pos.data_pos) {
struct page *page = NULL;
int max_write = PAGE_SIZE;
int bio_offset = 0;
- total_max_write = data_len - trail_len -
- con->out_msg_pos.data_pos;
-
- /*
- * if we are calculating the data crc (the default), we need
- * to map the page. if our pages[] has been revoked, use the
- * zero page.
- */
-
- /* have we reached the trail part of the data? */
- if (con->out_msg_pos.data_pos >= data_len - trail_len) {
- in_trail = true;
+ in_trail = in_trail || con->out_msg_pos.data_pos >= trail_off;
+ if (!in_trail)
+ total_max_write = trail_off - con->out_msg_pos.data_pos;
+ if (in_trail) {
total_max_write = data_len - con->out_msg_pos.data_pos;
page = list_first_entry(&msg->trail->head,
@@ -990,14 +993,13 @@ static int write_partial_msg_pages(struc
if (do_datacrc && !con->out_msg_pos.did_page_crc) {
void *base;
- u32 crc;
- u32 tmpcrc = le32_to_cpu(msg->footer.data_crc);
+ u32 crc = le32_to_cpu(msg->footer.data_crc);
char *kaddr;
kaddr = kmap(page);
BUG_ON(kaddr == NULL);
base = kaddr + con->out_msg_pos.page_pos + bio_offset;
- crc = crc32c(tmpcrc, base, len);
+ crc = crc32c(crc, base, len);
msg->footer.data_crc = cpu_to_le32(crc);
con->out_msg_pos.did_page_crc = true;
}
@@ -1702,9 +1704,6 @@ static int read_partial_message_bio(stru
void *p;
int ret, left;
- if (IS_ERR(bv))
- return PTR_ERR(bv);
-
left = min((int)(data_len - con->in_msg_pos.data_pos),
(int)(bv->bv_len - con->in_msg_pos.page_pos));
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/0073-libceph-clear-CONNECTING-in-ceph_con_close.patch
queue-3.4/0020-ceph-ensure-auth-ops-are-defined-before-use.patch
queue-3.4/0025-ceph-add-auth-buf-in-prepare_write_connect.patch
queue-3.4/0021-ceph-have-get_authorizer-methods-return-pointers.patch
queue-3.4/0026-libceph-avoid-unregistering-osd-request-when-not-reg.patch
queue-3.4/0077-libceph-distinguish-two-phases-of-connect-sequence.patch
queue-3.4/0045-libceph-provide-osd-number-when-creating-osd.patch
queue-3.4/0059-libceph-transition-socket-state-prior-to-actual-conn.patch
queue-3.4/0005-crush-fix-memory-leak-when-destroying-tree-buckets.patch
queue-3.4/0002-crush-adjust-local-retry-threshold.patch
queue-3.4/0023-ceph-return-pointer-from-prepare_connect_authorizer.patch
queue-3.4/0055-libceph-make-ceph_con_revoke_message-a-msg-op.patch
queue-3.4/0036-rbd-Fix-ceph_snap_context-size-calculation.patch
queue-3.4/0054-libceph-make-ceph_con_revoke-a-msg-operation.patch
queue-3.4/0066-libceph-move-init_bio_-functions-up.patch
queue-3.4/0018-ceph-define-ceph_auth_handshake-type.patch
queue-3.4/0063-libceph-encapsulate-out-message-data-setup.patch
queue-3.4/0076-libceph-separate-banner-and-connect-writes.patch
queue-3.4/0040-libceph-rename-socket-callbacks.patch
queue-3.4/0011-ceph-messenger-reset-connection-kvec-caller.patch
queue-3.4/0070-libceph-don-t-change-socket-state-on-sock-event.patch
queue-3.4/0061-libceph-use-con-get-put-methods.patch
queue-3.4/0074-libceph-clear-NEGOTIATING-when-done.patch
queue-3.4/0019-ceph-messenger-reduce-args-to-create_authorizer.patch
queue-3.4/0041-libceph-rename-kvec_reset-and-kvec_add-functions.patch
queue-3.4/0047-libceph-embed-ceph-connection-structure-in-mon_clien.patch
queue-3.4/0029-libceph-use-con-get-put-ops-from-osd_client.patch
queue-3.4/0051-libceph-tweak-ceph_alloc_msg.patch
queue-3.4/0064-libceph-encapsulate-advancing-msg-page.patch
queue-3.4/0075-libceph-define-and-use-an-explicit-CONNECTED-state.patch
queue-3.4/0060-libceph-fix-NULL-dereference-in-reset_connection.patch
queue-3.4/0015-ceph-messenger-check-prepare_write_connect-result.patch
queue-3.4/0003-crush-be-more-tolerant-of-nonsensical-crush-maps.patch
queue-3.4/0028-libceph-osd_client-don-t-drop-reply-reference-too-ea.patch
queue-3.4/0038-libceph-eliminate-connection-state-DEAD.patch
queue-3.4/0014-ceph-don-t-set-WRITE_PENDING-too-early.patch
queue-3.4/0049-libceph-init-monitor-connection-when-opening.patch
queue-3.4/0016-ceph-messenger-rework-prepare_connect_authorizer.patch
queue-3.4/0068-libceph-don-t-use-bio_iter-as-a-flag.patch
queue-3.4/0058-libceph-fix-overflow-in-osdmap_apply_incremental.patch
queue-3.4/0048-libceph-drop-connection-refcounting-for-mon_client.patch
queue-3.4/0039-libceph-kill-bad_proto-ceph-connection-op.patch
queue-3.4/0031-libceph-flush-msgr-queue-during-mon_client-shutdown.patch
queue-3.4/0013-ceph-drop-msgr-argument-from-prepare_write_connect.patch
queue-3.4/0030-rbd-Clear-ceph_msg-bio_iter-for-retransmitted-messag.patch
queue-3.4/0043-libceph-start-separating-connection-flags-from-state.patch
queue-3.4/0046-libceph-set-CLOSED-state-bit-in-con_init.patch
queue-3.4/0057-libceph-fix-overflow-in-osdmap_decode.patch
queue-3.4/0009-ceph-messenger-change-read_partial-to-take-end-arg.patch
queue-3.4/0017-ceph-messenger-check-return-from-get_authorizer.patch
queue-3.4/0056-libceph-fix-overflow-in-__decode_pool_names.patch
queue-3.4/0001-crush-clean-up-types-const-ness.patch
queue-3.4/0072-libceph-don-t-touch-con-state-in-con_close_socket.patch
queue-3.4/0044-libceph-start-tracking-connection-socket-state.patch
queue-3.4/0071-libceph-just-set-SOCK_CLOSED-when-state-changes.patch
queue-3.4/0022-ceph-use-info-returned-by-get_authorizer.patch
queue-3.4/0065-libceph-don-t-mark-footer-complete-before-it-is.patch
queue-3.4/0027-libceph-fix-pg_temp-updates.patch
queue-3.4/0079-libceph-add-some-fine-ASCII-art.patch
queue-3.4/0008-ceph-messenger-update-to-in-read_partial-caller.patch
queue-3.4/0007-ceph-messenger-use-read_partial-in-read_partial_mess.patch
queue-3.4/0078-libceph-small-changes-to-messenger.c.patch
queue-3.4/0010-libceph-don-t-reset-kvec-in-prepare_write_banner.patch
queue-3.4/0052-libceph-have-messages-point-to-their-connection.patch
queue-3.4/0067-libceph-move-init-of-bio_iter.patch
queue-3.4/0050-libceph-fully-initialize-connection-in-con_init.patch
queue-3.4/0053-libceph-have-messages-take-a-connection-reference.patch
queue-3.4/0012-ceph-messenger-send-banner-in-process_connect.patch
queue-3.4/0024-ceph-rename-prepare_connect_authorizer.patch
queue-3.4/0042-libceph-embed-ceph-messenger-structure-in-ceph_clien.patch
queue-3.4/0069-libceph-SOCK_CLOSED-is-a-flag-not-a-state.patch
queue-3.4/0004-crush-fix-tree-node-weight-lookup.patch
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