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libceph: distinguish page and bio requests

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An osd request uses either pages or a bio list for its data.  Use a
union to record information about the two, and add a data type
tag to select between them.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-02-14 12:16:43 -06:00 committed by Sage Weil
parent 2794a82a11
commit 2ac2b7a6d4
5 changed files with 54 additions and 20 deletions
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4
drivers/block/rbd.c
View File

@ -1425,12 +1425,16 @@ static struct ceph_osd_request *rbd_osd_req_create(
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;
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;
break;
}

4
fs/ceph/addr.c
View File

@ -243,6 +243,7 @@ static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg)
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];
@ -336,6 +337,7 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
}
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;
@ -561,6 +563,7 @@ static void writepages_finish(struct ceph_osd_request *req,
long writeback_stat;
unsigned issued = ceph_caps_issued(ci);
BUG_ON(req->r_data.type != CEPH_OSD_DATA_TYPE_PAGES);
if (rc >= 0) {
/*
* Assume we wrote the pages we originally sent. The
@ -830,6 +833,7 @@ static int ceph_writepages_start(struct address_space *mapping,
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;

1
fs/ceph/file.c
View File

@ -571,6 +571,7 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
req->r_data.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;

11
include/linux/ceph/osd_client.h
View File

@ -50,8 +50,17 @@ struct ceph_osd {
#define CEPH_OSD_MAX_OP 10
enum ceph_osd_data_type {
CEPH_OSD_DATA_TYPE_NONE,
CEPH_OSD_DATA_TYPE_PAGES,
#ifdef CONFIG_BLOCK
CEPH_OSD_DATA_TYPE_BIO,
#endif /* CONFIG_BLOCK */
};
struct ceph_osd_data {
struct {
enum ceph_osd_data_type type;
union {
struct {
struct page **pages;
u32 num_pages;

54
net/ceph/osd_client.c
View File

@ -122,7 +122,8 @@ void ceph_osdc_release_request(struct kref *kref)
}
if (req->r_reply)
ceph_msg_put(req->r_reply);
if (req->r_data.own_pages)
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);
ceph_put_snap_context(req->r_snapc);
@ -188,6 +189,7 @@ struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
}
req->r_reply = msg;
req->r_data.type = CEPH_OSD_DATA_TYPE_NONE;
ceph_pagelist_init(&req->r_trail);
/* create request message; allow space for oid */
@ -1739,12 +1741,17 @@ int ceph_osdc_start_request(struct ceph_osd_client *osdc,
{
int rc = 0;
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;
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;
#ifdef CONFIG_BLOCK
req->r_request->bio = req->r_data.bio;
} else if (req->r_data.type == CEPH_OSD_DATA_TYPE_BIO) {
req->r_request->bio = req->r_data.bio;
#endif
} else {
pr_err("unknown request data type %d\n", req->r_data.type);
}
req->r_request->trail = &req->r_trail;
register_request(osdc, req);
@ -1944,6 +1951,7 @@ int ceph_osdc_readpages(struct ceph_osd_client *osdc,
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;
@ -1987,6 +1995,7 @@ int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
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;
@ -2083,23 +2092,30 @@ static struct ceph_msg *get_reply(struct ceph_connection *con,
m = ceph_msg_get(req->r_reply);
if (data_len > 0) {
int want = calc_pages_for(req->r_data.alignment, data_len);
if (req->r_data.type == CEPH_OSD_DATA_TYPE_PAGES) {
int want;
if (req->r_data.pages && unlikely(req->r_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);
*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;
want = calc_pages_for(req->r_data.alignment, data_len);
if (req->r_data.pages &&
unlikely(req->r_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);
*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;
#ifdef CONFIG_BLOCK
m->bio = req->r_data.bio;
} else if (req->r_data.type == CEPH_OSD_DATA_TYPE_BIO) {
m->bio = req->r_data.bio;
#endif
}
}
*skip = 0;
req->r_con_filling_msg = con->ops->get(con);