From 97fb1c7f6637ee61c90b8bc186d464cfd426b063 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Fri, 1 Mar 2013 18:00:16 -0600 Subject: [PATCH] libceph: define ceph_msg_has_*() data macros Define and use macros ceph_msg_has_*() to determine whether to operate on the pages, pagelist, bio, and trail fields of a message. Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- include/linux/ceph/messenger.h | 7 +++++++ net/ceph/messenger.c | 44 ++++++++++++++++++++++++++---------------- 2 files changed, 34 insertions(+), 17 deletions(-) diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h index 1991a6f..889fe47 100644 --- a/include/linux/ceph/messenger.h +++ b/include/linux/ceph/messenger.h @@ -64,6 +64,13 @@ struct ceph_messenger { u32 required_features; }; +#define ceph_msg_has_pages(m) ((m)->pages != NULL) +#define ceph_msg_has_pagelist(m) ((m)->pagelist != NULL) +#ifdef CONFIG_BLOCK +#define ceph_msg_has_bio(m) ((m)->bio != NULL) +#endif /* CONFIG_BLOCK */ +#define ceph_msg_has_trail(m) ((m)->trail != NULL) + /* * a single message. it contains a header (src, dest, message type, etc.), * footer (crc values, mainly), a "front" message body, and possibly a diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index f70bc92..c74b528 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -746,12 +746,12 @@ static void prepare_message_data(struct ceph_msg *msg, /* initialize page iterator */ msg_pos->page = 0; - if (msg->pages) + if (ceph_msg_has_pages(msg)) msg_pos->page_pos = msg->page_alignment; else msg_pos->page_pos = 0; #ifdef CONFIG_BLOCK - if (msg->bio) + if (ceph_msg_has_bio(msg)) init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg); #endif msg_pos->data_pos = 0; @@ -1052,14 +1052,16 @@ static void out_msg_pos_next(struct ceph_connection *con, struct page *page, msg_pos->page_pos = 0; msg_pos->page++; msg_pos->did_page_crc = false; - if (in_trail) + if (in_trail) { + BUG_ON(!ceph_msg_has_trail(msg)); list_rotate_left(&msg->trail->head); - else if (msg->pagelist) + } else if (ceph_msg_has_pagelist(msg)) { list_rotate_left(&msg->pagelist->head); #ifdef CONFIG_BLOCK - else if (msg->bio) + } else if (ceph_msg_has_bio(msg)) { iter_bio_next(&msg->bio_iter, &msg->bio_seg); #endif + } } static void in_msg_pos_next(struct ceph_connection *con, size_t len, @@ -1114,8 +1116,13 @@ static int write_partial_message_data(struct ceph_connection *con) int ret; int total_max_write; bool in_trail = false; - const size_t trail_len = (msg->trail ? msg->trail->length : 0); - const size_t trail_off = data_len - trail_len; + size_t trail_len = 0; + size_t trail_off = data_len; + + if (ceph_msg_has_trail(msg)) { + trail_len = msg->trail->length; + trail_off -= trail_len; + } dout("%s %p msg %p page %d offset %d\n", __func__, con, msg, msg_pos->page, msg_pos->page_pos); @@ -1140,17 +1147,17 @@ static int write_partial_message_data(struct ceph_connection *con) total_max_write = trail_off - msg_pos->data_pos; if (in_trail) { + BUG_ON(!ceph_msg_has_trail(msg)); total_max_write = data_len - msg_pos->data_pos; - page = list_first_entry(&msg->trail->head, struct page, lru); - } else if (msg->pages) { + } else if (ceph_msg_has_pages(msg)) { page = msg->pages[msg_pos->page]; - } else if (msg->pagelist) { + } else if (ceph_msg_has_pagelist(msg)) { page = list_first_entry(&msg->pagelist->head, struct page, lru); #ifdef CONFIG_BLOCK - } else if (msg->bio) { + } else if (ceph_msg_has_bio(msg)) { struct bio_vec *bv; bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg); @@ -1908,13 +1915,13 @@ static int read_partial_msg_data(struct ceph_connection *con) data_len = le32_to_cpu(con->in_hdr.data_len); while (msg_pos->data_pos < data_len) { - if (msg->pages) { + if (ceph_msg_has_pages(msg)) { ret = read_partial_message_pages(con, msg->pages, data_len, do_datacrc); if (ret <= 0) return ret; #ifdef CONFIG_BLOCK - } else if (msg->bio) { + } else if (ceph_msg_has_bio(msg)) { ret = read_partial_message_bio(con, data_len, do_datacrc); if (ret <= 0) @@ -2946,16 +2953,19 @@ void ceph_msg_last_put(struct kref *kref) ceph_buffer_put(m->middle); m->middle = NULL; } - m->length = 0; - m->pages = NULL; + if (ceph_msg_has_pages(m)) { + m->length = 0; + m->pages = NULL; + } - if (m->pagelist) { + if (ceph_msg_has_pagelist(m)) { ceph_pagelist_release(m->pagelist); kfree(m->pagelist); m->pagelist = NULL; } - m->trail = NULL; + if (ceph_msg_has_trail(m)) + m->trail = NULL; if (m->pool) ceph_msgpool_put(m->pool, m); -- 2.7.4