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libceph: record byte count not page count 

Record the byte count for an osd request rather than the page count.
The number of pages can always be derived from the byte count (and
alignment/offset) but the reverse is not true.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-03-07 15:38:25 -06:00 committed by Sage Weil
parent 9516e45b25
commit e0c594878e
5 changed files with 52 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/block/rbd.c
View File

@ -1433,7 +1433,7 @@ static struct ceph_osd_request *rbd_osd_req_create(
case OBJ_REQUEST_PAGES:
osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
osd_data->pages = obj_request->pages;
osd_data->num_pages = obj_request->page_count;
osd_data->length = obj_request->length;
osd_data->alignment = offset & ~PAGE_MASK;
osd_data->pages_from_pool = false;
osd_data->own_pages = false;

33
fs/ceph/addr.c
View File

@ -238,13 +238,16 @@ static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg)
struct inode *inode = req->r_inode;
int rc = req->r_result;
int bytes = le32_to_cpu(msg->hdr.data_len);
int num_pages;
int i;
dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes);
/* unlock all pages, zeroing any data we didn't read */
BUG_ON(req->r_data_in.type != CEPH_OSD_DATA_TYPE_PAGES);
for (i = 0; i < req->r_data_in.num_pages; i++) {
num_pages = calc_pages_for((u64)req->r_data_in.alignment,
(u64)req->r_data_in.length);
for (i = 0; i < num_pages; i++) {
struct page *page = req->r_data_in.pages[i];
if (bytes < (int)PAGE_CACHE_SIZE) {
@ -340,7 +343,7 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
}
req->r_data_in.type = CEPH_OSD_DATA_TYPE_PAGES;
req->r_data_in.pages = pages;
req->r_data_in.num_pages = nr_pages;
req->r_data_in.length = len;
req->r_data_in.alignment = 0;
req->r_callback = finish_read;
req->r_inode = inode;
@ -555,6 +558,7 @@ static void writepages_finish(struct ceph_osd_request *req,
struct ceph_inode_info *ci = ceph_inode(inode);
unsigned wrote;
struct page *page;
int num_pages;
int i;
struct ceph_snap_context *snapc = req->r_snapc;
struct address_space *mapping = inode->i_mapping;
@ -565,6 +569,8 @@ static void writepages_finish(struct ceph_osd_request *req,
unsigned issued = ceph_caps_issued(ci);
BUG_ON(req->r_data_out.type != CEPH_OSD_DATA_TYPE_PAGES);
num_pages = calc_pages_for((u64)req->r_data_out.alignment,
(u64)req->r_data_out.length);
if (rc >= 0) {
/*
* Assume we wrote the pages we originally sent. The
@ -572,7 +578,7 @@ static void writepages_finish(struct ceph_osd_request *req,
* raced with a truncation and was adjusted at the osd,
* so don't believe the reply.
*/
wrote = req->r_data_out.num_pages;
wrote = num_pages;
} else {
wrote = 0;
mapping_set_error(mapping, rc);
@ -581,7 +587,7 @@ static void writepages_finish(struct ceph_osd_request *req,
inode, rc, bytes, wrote);
/* clean all pages */
for (i = 0; i < req->r_data_out.num_pages; i++) {
for (i = 0; i < num_pages; i++) {
page = req->r_data_out.pages[i];
BUG_ON(!page);
WARN_ON(!PageUptodate(page));
@ -611,9 +617,9 @@ static void writepages_finish(struct ceph_osd_request *req,
unlock_page(page);
}
dout("%p wrote+cleaned %d pages\n", inode, wrote);
ceph_put_wrbuffer_cap_refs(ci, req->r_data_out.num_pages, snapc);
ceph_put_wrbuffer_cap_refs(ci, num_pages, snapc);
ceph_release_pages(req->r_data_out.pages, req->r_data_out.num_pages);
ceph_release_pages(req->r_data_out.pages, num_pages);
if (req->r_data_out.pages_from_pool)
mempool_free(req->r_data_out.pages,
ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool);
@ -624,15 +630,18 @@ static void writepages_finish(struct ceph_osd_request *req,
/*
* allocate a page vec, either directly, or if necessary, via a the
* mempool. we avoid the mempool if we can because req->r_data_out.num_pages
* mempool. we avoid the mempool if we can because req->r_data_out.length
* may be less than the maximum write size.
*/
static void alloc_page_vec(struct ceph_fs_client *fsc,
struct ceph_osd_request *req)
{
size_t size;
int num_pages;
size = sizeof (struct page *) * req->r_data_out.num_pages;
num_pages = calc_pages_for((u64)req->r_data_out.alignment,
(u64)req->r_data_out.length);
size = sizeof (struct page *) * num_pages;
req->r_data_out.pages = kmalloc(size, GFP_NOFS);
if (!req->r_data_out.pages) {
req->r_data_out.pages = mempool_alloc(fsc->wb_pagevec_pool,
@ -838,11 +847,9 @@ get_more_pages:
}
req->r_data_out.type = CEPH_OSD_DATA_TYPE_PAGES;
req->r_data_out.num_pages =
calc_pages_for(0, len);
req->r_data_out.length = len;
req->r_data_out.alignment = 0;
max_pages = req->r_data_out.num_pages;
max_pages = calc_pages_for(0, (u64)len);
alloc_page_vec(fsc, req);
req->r_callback = writepages_finish;
req->r_inode = inode;
@ -900,7 +907,7 @@ get_more_pages:
locked_pages, offset, len);
/* revise final length, page count */
req->r_data_out.num_pages = locked_pages;
req->r_data_out.length = len;
req->r_request_ops[0].extent.length = cpu_to_le64(len);
req->r_request_ops[0].payload_len = cpu_to_le32(len);
req->r_request->hdr.data_len = cpu_to_le32(len);

2
fs/ceph/file.c
View File

@ -573,7 +573,7 @@ more:
}
req->r_data_out.type = CEPH_OSD_DATA_TYPE_PAGES;
req->r_data_out.pages = pages;
req->r_data_out.num_pages = num_pages;
req->r_data_out.length = len;
req->r_data_out.alignment = page_align;
req->r_inode = inode;

2
include/linux/ceph/osd_client.h
View File

@ -63,7 +63,7 @@ struct ceph_osd_data {
union {
struct {
struct page **pages;
u32 num_pages;
u64 length;
u32 alignment;
bool pages_from_pool;
bool own_pages;

50
net/ceph/osd_client.c
View File

@ -107,6 +107,7 @@ static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
*/
void ceph_osdc_release_request(struct kref *kref)
{
int num_pages;
struct ceph_osd_request *req = container_of(kref,
struct ceph_osd_request,
r_kref);
@ -124,13 +125,17 @@ void ceph_osdc_release_request(struct kref *kref)
ceph_msg_put(req->r_reply);
if (req->r_data_in.type == CEPH_OSD_DATA_TYPE_PAGES &&
req->r_data_in.own_pages)
ceph_release_page_vector(req->r_data_in.pages,
req->r_data_in.num_pages);
req->r_data_in.own_pages) {
num_pages = calc_pages_for((u64)req->r_data_in.alignment,
(u64)req->r_data_in.length);
ceph_release_page_vector(req->r_data_in.pages, num_pages);
}
if (req->r_data_out.type == CEPH_OSD_DATA_TYPE_PAGES &&
req->r_data_out.own_pages)
ceph_release_page_vector(req->r_data_out.pages,
req->r_data_out.num_pages);
req->r_data_out.own_pages) {
num_pages = calc_pages_for((u64)req->r_data_out.alignment,
(u64)req->r_data_out.length);
ceph_release_page_vector(req->r_data_out.pages, num_pages);
}
ceph_put_snap_context(req->r_snapc);
ceph_pagelist_release(&req->r_trail);
@ -1753,8 +1758,12 @@ int ceph_osdc_start_request(struct ceph_osd_client *osdc,
osd_data = &req->r_data_out;
if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
unsigned int page_count;
req->r_request->pages = osd_data->pages;
req->r_request->page_count = osd_data->num_pages;
page_count = calc_pages_for((u64)osd_data->alignment,
(u64)osd_data->length);
req->r_request->page_count = page_count;
req->r_request->page_alignment = osd_data->alignment;
#ifdef CONFIG_BLOCK
} else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
@ -1967,11 +1976,11 @@ int ceph_osdc_readpages(struct ceph_osd_client *osdc,
osd_data = &req->r_data_in;
osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
osd_data->pages = pages;
osd_data->num_pages = calc_pages_for(page_align, *plen);
osd_data->length = *plen;
osd_data->alignment = page_align;
dout("readpages final extent is %llu~%llu (%d pages align %d)\n",
off, *plen, osd_data->num_pages, page_align);
dout("readpages final extent is %llu~%llu (%llu bytes align %d)\n",
off, *plen, osd_data->length, page_align);
rc = ceph_osdc_start_request(osdc, req, false);
if (!rc)
@ -2013,10 +2022,9 @@ int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
osd_data = &req->r_data_out;
osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
osd_data->pages = pages;
osd_data->num_pages = calc_pages_for(page_align, len);
osd_data->length = len;
osd_data->alignment = page_align;
dout("writepages %llu~%llu (%d pages)\n", off, len,
osd_data->num_pages);
dout("writepages %llu~%llu (%llu bytes)\n", off, len, osd_data->length);
rc = ceph_osdc_start_request(osdc, req, true);
if (!rc)
@ -2112,23 +2120,23 @@ static struct ceph_msg *get_reply(struct ceph_connection *con,
struct ceph_osd_data *osd_data = &req->r_data_in;
if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
int want;
unsigned int page_count;
want = calc_pages_for(osd_data->alignment, data_len);
if (osd_data->pages &&
unlikely(osd_data->num_pages < want)) {
unlikely(osd_data->length < data_len)) {
pr_warning("tid %lld reply has %d bytes %d "
"pages, we had only %d pages ready\n",
tid, data_len, want,
osd_data->num_pages);
pr_warning("tid %lld reply has %d bytes "
"we had only %llu bytes ready\n",
tid, data_len, osd_data->length);
*skip = 1;
ceph_msg_put(m);
m = NULL;
goto out;
}
page_count = calc_pages_for((u64)osd_data->alignment,
(u64)osd_data->length);
m->pages = osd_data->pages;
m->page_count = osd_data->num_pages;
m->page_count = page_count;
m->page_alignment = osd_data->alignment;
#ifdef CONFIG_BLOCK
} else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {