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libceph: add ceph_osdc_call() single-page helper 

Add a convenience function to osd_client to send Ceph OSD
'class' ops. The interface assumes that the request and
reply data each consist of single pages.

Signed-off-by: Douglas Fuller <dfuller@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Douglas Fuller 2015-06-17 14:49:45 -04:00 committed by Ilya Dryomov
parent a4ed38d7a1
commit 428a715811
2 changed files with 59 additions and 0 deletions
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8
include/linux/ceph/osd_client.h
View File

@ -397,6 +397,14 @@ extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
extern void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc);
void ceph_osdc_maybe_request_map(struct ceph_osd_client *osdc);
int ceph_osdc_call(struct ceph_osd_client *osdc,
struct ceph_object_id *oid,
struct ceph_object_locator *oloc,
const char *class, const char *method,
unsigned int flags,
struct page *req_page, size_t req_len,
struct page *resp_page, size_t *resp_len);
extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
struct ceph_vino vino,
struct ceph_file_layout *layout,

51
net/ceph/osd_client.c
View File

@ -4026,6 +4026,57 @@ void ceph_osdc_maybe_request_map(struct ceph_osd_client *osdc)
}
EXPORT_SYMBOL(ceph_osdc_maybe_request_map);
/*
* Execute an OSD class method on an object.
*
* @flags: CEPH_OSD_FLAG_*
* @resp_len: out param for reply length
*/
int ceph_osdc_call(struct ceph_osd_client *osdc,
struct ceph_object_id *oid,
struct ceph_object_locator *oloc,
const char *class, const char *method,
unsigned int flags,
struct page *req_page, size_t req_len,
struct page *resp_page, size_t *resp_len)
{
struct ceph_osd_request *req;
int ret;
req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
if (!req)
return -ENOMEM;
ceph_oid_copy(&req->r_base_oid, oid);
ceph_oloc_copy(&req->r_base_oloc, oloc);
req->r_flags = flags;
ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
if (ret)
goto out_put_req;
osd_req_op_cls_init(req, 0, CEPH_OSD_OP_CALL, class, method);
if (req_page)
osd_req_op_cls_request_data_pages(req, 0, &req_page, req_len,
0, false, false);
if (resp_page)
osd_req_op_cls_response_data_pages(req, 0, &resp_page,
PAGE_SIZE, 0, false, false);
ceph_osdc_start_request(osdc, req, false);
ret = ceph_osdc_wait_request(osdc, req);
if (ret >= 0) {
ret = req->r_ops[0].rval;
if (resp_page)
*resp_len = req->r_ops[0].outdata_len;
}
out_put_req:
ceph_osdc_put_request(req);
return ret;
}
EXPORT_SYMBOL(ceph_osdc_call);
/*
* init, shutdown
*/