libceph: separate read and write data
An osd request defines information about where data to be read
should be placed as well as where data to write comes from.
Currently these are represented by common fields.
Keep information about data for writing separate from data to be
read by splitting these into data_in and data_out fields.
This is the key patch in this whole series, in that it actually
identifies which osd requests generate outgoing data and which
generate incoming data. It's less obvious (currently) that an osd
CALL op generates both outgoing and incoming data; that's the focus
of some upcoming work.
This resolves:
http://tracker.ceph.com/issues/4127
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index f189bc2..3f69eb1 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1398,6 +1398,7 @@
struct ceph_snap_context *snapc = NULL;
struct ceph_osd_client *osdc;
struct ceph_osd_request *osd_req;
+ struct ceph_osd_data *osd_data;
struct timespec now;
struct timespec *mtime;
u64 snap_id = CEPH_NOSNAP;
@@ -1418,6 +1419,7 @@
osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_ATOMIC);
if (!osd_req)
return NULL; /* ENOMEM */
+ osd_data = write_request ? &osd_req->r_data_out : &osd_req->r_data_in;
rbd_assert(obj_request_type_valid(obj_request->type));
switch (obj_request->type) {
@@ -1425,16 +1427,16 @@
break; /* Nothing to do */
case OBJ_REQUEST_BIO:
rbd_assert(obj_request->bio_list != NULL);
- osd_req->r_data.type = CEPH_OSD_DATA_TYPE_BIO;
- osd_req->r_data.bio = obj_request->bio_list;
+ osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
+ osd_data->bio = obj_request->bio_list;
break;
case OBJ_REQUEST_PAGES:
- osd_req->r_data.type = CEPH_OSD_DATA_TYPE_PAGES;
- osd_req->r_data.pages = obj_request->pages;
- osd_req->r_data.num_pages = obj_request->page_count;
- osd_req->r_data.alignment = offset & ~PAGE_MASK;
- osd_req->r_data.pages_from_pool = false;
- osd_req->r_data.own_pages = false;
+ osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
+ osd_data->pages = obj_request->pages;
+ osd_data->num_pages = obj_request->page_count;
+ osd_data->alignment = offset & ~PAGE_MASK;
+ osd_data->pages_from_pool = false;
+ osd_data->own_pages = false;
break;
}
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 276fe96..c117c51 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -243,9 +243,9 @@
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.type != CEPH_OSD_DATA_TYPE_PAGES);
- for (i = 0; i < req->r_data.num_pages; i++, bytes -= PAGE_CACHE_SIZE) {
- struct page *page = req->r_data.pages[i];
+ BUG_ON(req->r_data_in.type != CEPH_OSD_DATA_TYPE_PAGES);
+ for (i = 0; i < req->r_data_in.num_pages; i++) {
+ struct page *page = req->r_data_in.pages[i];
if (bytes < (int)PAGE_CACHE_SIZE) {
/* zero (remainder of) page */
@@ -258,8 +258,9 @@
SetPageUptodate(page);
unlock_page(page);
page_cache_release(page);
+ bytes -= PAGE_CACHE_SIZE;
}
- kfree(req->r_data.pages);
+ kfree(req->r_data_in.pages);
}
static void ceph_unlock_page_vector(struct page **pages, int num_pages)
@@ -337,10 +338,10 @@
}
pages[i] = page;
}
- req->r_data.type = CEPH_OSD_DATA_TYPE_PAGES;
- req->r_data.pages = pages;
- req->r_data.num_pages = nr_pages;
- req->r_data.alignment = 0;
+ 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.alignment = 0;
req->r_callback = finish_read;
req->r_inode = inode;
@@ -563,7 +564,7 @@
long writeback_stat;
unsigned issued = ceph_caps_issued(ci);
- BUG_ON(req->r_data.type != CEPH_OSD_DATA_TYPE_PAGES);
+ BUG_ON(req->r_data_out.type != CEPH_OSD_DATA_TYPE_PAGES);
if (rc >= 0) {
/*
* Assume we wrote the pages we originally sent. The
@@ -571,7 +572,7 @@
* raced with a truncation and was adjusted at the osd,
* so don't believe the reply.
*/
- wrote = req->r_data.num_pages;
+ wrote = req->r_data_out.num_pages;
} else {
wrote = 0;
mapping_set_error(mapping, rc);
@@ -580,8 +581,8 @@
inode, rc, bytes, wrote);
/* clean all pages */
- for (i = 0; i < req->r_data.num_pages; i++) {
- page = req->r_data.pages[i];
+ for (i = 0; i < req->r_data_out.num_pages; i++) {
+ page = req->r_data_out.pages[i];
BUG_ON(!page);
WARN_ON(!PageUptodate(page));
@@ -610,31 +611,34 @@
unlock_page(page);
}
dout("%p wrote+cleaned %d pages\n", inode, wrote);
- ceph_put_wrbuffer_cap_refs(ci, req->r_data.num_pages, snapc);
+ ceph_put_wrbuffer_cap_refs(ci, req->r_data_out.num_pages, snapc);
- ceph_release_pages(req->r_data.pages, req->r_data.num_pages);
- if (req->r_data.pages_from_pool)
- mempool_free(req->r_data.pages,
+ ceph_release_pages(req->r_data_out.pages, req->r_data_out.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);
else
- kfree(req->r_data.pages);
+ kfree(req->r_data_out.pages);
ceph_osdc_put_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.num_pages
+ * mempool. we avoid the mempool if we can because req->r_data_out.num_pages
* may be less than the maximum write size.
*/
static void alloc_page_vec(struct ceph_fs_client *fsc,
struct ceph_osd_request *req)
{
- req->r_data.pages = kmalloc(sizeof(struct page *) * req->r_data.num_pages,
- GFP_NOFS);
- if (!req->r_data.pages) {
- req->r_data.pages = mempool_alloc(fsc->wb_pagevec_pool, GFP_NOFS);
- req->r_data.pages_from_pool = 1;
- WARN_ON(!req->r_data.pages);
+ size_t size;
+
+ size = sizeof (struct page *) * req->r_data_out.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,
+ GFP_NOFS);
+ req->r_data_out.pages_from_pool = 1;
+ WARN_ON(!req->r_data_out.pages);
}
}
@@ -833,10 +837,11 @@
break;
}
- req->r_data.type = CEPH_OSD_DATA_TYPE_PAGES;
- req->r_data.num_pages = calc_pages_for(0, len);
- req->r_data.alignment = 0;
- max_pages = req->r_data.num_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.alignment = 0;
+ max_pages = req->r_data_out.num_pages;
alloc_page_vec(fsc, req);
req->r_callback = writepages_finish;
@@ -858,7 +863,7 @@
}
set_page_writeback(page);
- req->r_data.pages[locked_pages] = page;
+ req->r_data_out.pages[locked_pages] = page;
locked_pages++;
next = page->index + 1;
}
@@ -888,14 +893,14 @@
}
/* submit the write */
- offset = req->r_data.pages[0]->index << PAGE_CACHE_SHIFT;
+ offset = req->r_data_out.pages[0]->index << PAGE_CACHE_SHIFT;
len = min((snap_size ? snap_size : i_size_read(inode)) - offset,
(u64)locked_pages << PAGE_CACHE_SHIFT);
dout("writepages got %d pages at %llu~%llu\n",
locked_pages, offset, len);
/* revise final length, page count */
- req->r_data.num_pages = locked_pages;
+ req->r_data_out.num_pages = locked_pages;
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);
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 3643a38..501fb37 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -568,13 +568,13 @@
if ((file->f_flags & O_SYNC) == 0) {
/* get a second commit callback */
req->r_safe_callback = sync_write_commit;
- req->r_data.own_pages = 1;
+ req->r_data_out.own_pages = 1;
}
}
- req->r_data.type = CEPH_OSD_DATA_TYPE_PAGES;
- req->r_data.pages = pages;
- req->r_data.num_pages = num_pages;
- req->r_data.alignment = page_align;
+ 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.alignment = page_align;
req->r_inode = inode;
ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index 56604b3..40e0260 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -130,8 +130,9 @@
struct ceph_file_layout r_file_layout;
struct ceph_snap_context *r_snapc; /* snap context for writes */
- struct ceph_osd_data r_data;
- struct ceph_pagelist r_trail; /* trailing part of the data */
+ struct ceph_osd_data r_data_in;
+ struct ceph_osd_data r_data_out;
+ struct ceph_pagelist r_trail; /* trailing part of data out */
};
struct ceph_osd_event {
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 591e1b0..f9cf445 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -122,10 +122,16 @@
}
if (req->r_reply)
ceph_msg_put(req->r_reply);
- if (req->r_data.type == CEPH_OSD_DATA_TYPE_PAGES &&
- req->r_data.own_pages)
- ceph_release_page_vector(req->r_data.pages,
- req->r_data.num_pages);
+
+ 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);
+ 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);
+
ceph_put_snap_context(req->r_snapc);
ceph_pagelist_release(&req->r_trail);
if (req->r_mempool)
@@ -189,7 +195,8 @@
}
req->r_reply = msg;
- req->r_data.type = CEPH_OSD_DATA_TYPE_NONE;
+ req->r_data_in.type = CEPH_OSD_DATA_TYPE_NONE;
+ req->r_data_out.type = CEPH_OSD_DATA_TYPE_NONE;
ceph_pagelist_init(&req->r_trail);
/* create request message; allow space for oid */
@@ -1740,17 +1747,21 @@
bool nofail)
{
int rc = 0;
+ struct ceph_osd_data *osd_data;
- if (req->r_data.type == CEPH_OSD_DATA_TYPE_PAGES) {
- req->r_request->pages = req->r_data.pages;
- req->r_request->page_count = req->r_data.num_pages;
- req->r_request->page_alignment = req->r_data.alignment;
+ /* Set up outgoing data */
+
+ osd_data = &req->r_data_out;
+ if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
+ req->r_request->pages = osd_data->pages;
+ req->r_request->page_count = osd_data->num_pages;
+ req->r_request->page_alignment = osd_data->alignment;
#ifdef CONFIG_BLOCK
- } else if (req->r_data.type == CEPH_OSD_DATA_TYPE_BIO) {
- req->r_request->bio = req->r_data.bio;
+ } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
+ req->r_request->bio = osd_data->bio;
#endif
} else {
- pr_err("unknown request data type %d\n", req->r_data.type);
+ BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
}
req->r_request->trail = &req->r_trail;
@@ -1939,6 +1950,7 @@
struct page **pages, int num_pages, int page_align)
{
struct ceph_osd_request *req;
+ struct ceph_osd_data *osd_data;
int rc = 0;
dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
@@ -1951,13 +1963,15 @@
return PTR_ERR(req);
/* it may be a short read due to an object boundary */
- req->r_data.type = CEPH_OSD_DATA_TYPE_PAGES;
- req->r_data.pages = pages;
- req->r_data.num_pages = calc_pages_for(page_align, *plen);
- req->r_data.alignment = page_align;
+
+ 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->alignment = page_align;
dout("readpages final extent is %llu~%llu (%d pages align %d)\n",
- off, *plen, req->r_data.num_pages, page_align);
+ off, *plen, osd_data->num_pages, page_align);
rc = ceph_osdc_start_request(osdc, req, false);
if (!rc)
@@ -1981,6 +1995,7 @@
struct page **pages, int num_pages)
{
struct ceph_osd_request *req;
+ struct ceph_osd_data *osd_data;
int rc = 0;
int page_align = off & ~PAGE_MASK;
@@ -1995,11 +2010,13 @@
return PTR_ERR(req);
/* it may be a short write due to an object boundary */
- req->r_data.type = CEPH_OSD_DATA_TYPE_PAGES;
- req->r_data.pages = pages;
- req->r_data.num_pages = calc_pages_for(page_align, len);
- req->r_data.alignment = page_align;
- dout("writepages %llu~%llu (%d pages)\n", off, len, req->r_data.num_pages);
+ 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->alignment = page_align;
+ dout("writepages %llu~%llu (%d pages)\n", off, len,
+ osd_data->num_pages);
rc = ceph_osdc_start_request(osdc, req, true);
if (!rc)
@@ -2092,28 +2109,30 @@
m = ceph_msg_get(req->r_reply);
if (data_len > 0) {
- if (req->r_data.type == CEPH_OSD_DATA_TYPE_PAGES) {
+ struct ceph_osd_data *osd_data = &req->r_data_in;
+
+ if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
int want;
- want = calc_pages_for(req->r_data.alignment, data_len);
- if (req->r_data.pages &&
- unlikely(req->r_data.num_pages < want)) {
+ want = calc_pages_for(osd_data->alignment, data_len);
+ if (osd_data->pages &&
+ unlikely(osd_data->num_pages < want)) {
pr_warning("tid %lld reply has %d bytes %d "
"pages, we had only %d pages ready\n",
tid, data_len, want,
- req->r_data.num_pages);
+ osd_data->num_pages);
*skip = 1;
ceph_msg_put(m);
m = NULL;
goto out;
}
- m->pages = req->r_data.pages;
- m->page_count = req->r_data.num_pages;
- m->page_alignment = req->r_data.alignment;
+ m->pages = osd_data->pages;
+ m->page_count = osd_data->num_pages;
+ m->page_alignment = osd_data->alignment;
#ifdef CONFIG_BLOCK
- } else if (req->r_data.type == CEPH_OSD_DATA_TYPE_BIO) {
- m->bio = req->r_data.bio;
+ } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
+ m->bio = osd_data->bio;
#endif
}
}
