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libceph: distinguish page array and pagelist count

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Use distinct fields for tracking the number of pages in a message's
page array and in a message's page list.  Currently only one or the
other is used at a time, but that will be changing soon.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-02-25 17:35:46 -06:00 committed by Sage Weil
parent 60cf5992d9
commit d4b515fa10
4 changed files with 14 additions and 11 deletions
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4
fs/ceph/mds_client.c
View file

@ -1719,7 +1719,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
msg->pages = req->r_pages;
msg->nr_pages = req->r_num_pages;
msg->page_count = req->r_num_pages;
msg->hdr.data_len = cpu_to_le32(req->r_data_len);
msg->hdr.data_off = cpu_to_le16(0);
@ -2600,10 +2600,10 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc,
}
reply->pagelist = pagelist;
reply->pagelist_count = calc_pages_for(0, pagelist->length);
if (recon_state.flock)
reply->hdr.version = cpu_to_le16(2);
reply->hdr.data_len = cpu_to_le32(pagelist->length);
reply->nr_pages = calc_pages_for(0, pagelist->length);
ceph_con_send(&session->s_con, reply);
mutex_unlock(&session->s_mutex);

3
include/linux/ceph/messenger.h
View file

@ -75,9 +75,10 @@ struct ceph_msg {
struct kvec front; /* unaligned blobs of message */
struct ceph_buffer *middle;
struct page **pages; /* data payload. NOT OWNER. */
unsigned nr_pages; /* size of page array */
unsigned page_count; /* size of page array */
unsigned page_alignment; /* io offset in first page */
struct ceph_pagelist *pagelist; /* instead of pages */
unsigned int pagelist_count; /* number of pages in pagelist */
struct ceph_connection *con;
struct list_head list_head;

14
net/ceph/messenger.c
View file

@ -813,7 +813,7 @@ static void prepare_write_message(struct ceph_connection *con)
m, con->out_seq, le16_to_cpu(m->hdr.type),
le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
le32_to_cpu(m->hdr.data_len),
m->nr_pages);
m->page_count);
BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
/* tag + hdr + front + middle */
@ -1072,7 +1072,7 @@ static int write_partial_msg_pages(struct ceph_connection *con)
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, msg, con->out_msg_pos.page, msg->page_count,
con->out_msg_pos.page_pos);
/*
@ -2715,9 +2715,10 @@ struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
m->middle = NULL;
/* data */
m->nr_pages = 0;
m->page_count = 0;
m->page_alignment = 0;
m->pages = NULL;
m->pagelist_count = 0;
m->pagelist = NULL;
#ifdef CONFIG_BLOCK
m->bio = NULL;
@ -2890,13 +2891,14 @@ void ceph_msg_last_put(struct kref *kref)
ceph_buffer_put(m->middle);
m->middle = NULL;
}
m->nr_pages = 0;
m->page_count = 0;
m->pages = NULL;
if (m->pagelist) {
ceph_pagelist_release(m->pagelist);
kfree(m->pagelist);
m->pagelist = NULL;
m->pagelist_count = 0;
}
m->trail = NULL;
@ -2910,8 +2912,8 @@ EXPORT_SYMBOL(ceph_msg_last_put);
void ceph_msg_dump(struct ceph_msg *msg)
{
pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
msg->front_max, msg->nr_pages);
pr_debug("msg_dump %p (front_max %d page_count %d)\n", msg,
msg->front_max, msg->page_count);
print_hex_dump(KERN_DEBUG, "header: ",
DUMP_PREFIX_OFFSET, 16, 1,
&msg->hdr, sizeof(msg->hdr), true);

4
net/ceph/osd_client.c
View file

@ -1742,7 +1742,7 @@ int ceph_osdc_start_request(struct ceph_osd_client *osdc,
int rc = 0;
req->r_request->pages = req->r_pages;
req->r_request->nr_pages = req->r_num_pages;
req->r_request->page_count = req->r_num_pages;
#ifdef CONFIG_BLOCK
req->r_request->bio = req->r_bio;
#endif
@ -2093,7 +2093,7 @@ static struct ceph_msg *get_reply(struct ceph_connection *con,
goto out;
}
m->pages = req->r_pages;
m->nr_pages = req->r_num_pages;
m->page_count = req->r_num_pages;
m->page_alignment = req->r_page_alignment;
#ifdef CONFIG_BLOCK
m->bio = req->r_bio;