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rbd: switch rbd_obj_method_sync() to ceph_osdc_call() 

As explained in the previous commit, rbd_obj_request machinery (and
rbd_osd_req_create() in particular) shouldn't be used for working with
metadata objects.

Switch to the recently added ceph_osdc_call().  It assumes single pages
for outbound and inbound buffers, but that's OK - none of the callers
need more than that.  These pages need to be allocated (messenger is in
dire need of proper iterator interface!), but we are swapping for
pages[] and pagelist allocations in the existing code.

Kill class_name argument - all rbd methods are under "rbd".

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
This commit is contained in:
Ilya Dryomov 2017-01-25 18:16:21 +01:00
parent 2544a02090
commit ecd4a68a26
1 changed files with 67 additions and 95 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

162
drivers/block/rbd.c
View File

@ -3971,17 +3971,17 @@ static void rbd_reregister_watch(struct work_struct *work)
* returned in the outbound buffer, or a negative error code.
*/
static int rbd_obj_method_sync(struct rbd_device *rbd_dev,
const char *object_name,
const char *class_name,
struct ceph_object_id *oid,
struct ceph_object_locator *oloc,
const char *method_name,
const void *outbound,
size_t outbound_size,
void *inbound,
size_t inbound_size)
{
struct rbd_obj_request *obj_request;
struct page **pages;
u32 page_count;
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
struct page *req_page = NULL;
struct page *reply_page;
int ret;
/*
@ -3991,61 +3991,35 @@ static int rbd_obj_method_sync(struct rbd_device *rbd_dev,
* method. Currently if this is present it will be a
* snapshot id.
*/
page_count = (u32)calc_pages_for(0, inbound_size);
pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
if (IS_ERR(pages))
return PTR_ERR(pages);
if (outbound) {
if (outbound_size > PAGE_SIZE)
return -E2BIG;
ret = -ENOMEM;
obj_request = rbd_obj_request_create(object_name, 0, inbound_size,
OBJ_REQUEST_PAGES);
if (!obj_request)
goto out;
req_page = alloc_page(GFP_KERNEL);
if (!req_page)
return -ENOMEM;
obj_request->pages = pages;
obj_request->page_count = page_count;
obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1,
obj_request);
if (!obj_request->osd_req)
goto out;
osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL,
class_name, method_name);
if (outbound_size) {
struct ceph_pagelist *pagelist;
pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
if (!pagelist)
goto out;
ceph_pagelist_init(pagelist);
ceph_pagelist_append(pagelist, outbound, outbound_size);
osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0,
pagelist);
memcpy(page_address(req_page), outbound, outbound_size);
}
osd_req_op_cls_response_data_pages(obj_request->osd_req, 0,
obj_request->pages, inbound_size,
0, false, false);
rbd_obj_request_submit(obj_request);
ret = rbd_obj_request_wait(obj_request);
if (ret)
goto out;
reply_page = alloc_page(GFP_KERNEL);
if (!reply_page) {
if (req_page)
__free_page(req_page);
return -ENOMEM;
}
ret = obj_request->result;
if (ret < 0)
goto out;
rbd_assert(obj_request->xferred < (u64)INT_MAX);
ret = (int)obj_request->xferred;
ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred);
out:
if (obj_request)
rbd_obj_request_put(obj_request);
else
ceph_release_page_vector(pages, page_count);
ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name,
CEPH_OSD_FLAG_READ, req_page, outbound_size,
reply_page, &inbound_size);
if (!ret) {
memcpy(inbound, page_address(reply_page), inbound_size);
ret = inbound_size;
}
if (req_page)
__free_page(req_page);
__free_page(reply_page);
return ret;
}
@ -4939,10 +4913,10 @@ static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
__le64 size;
} __attribute__ ((packed)) size_buf = { 0 };
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
"rbd", "get_size",
&snapid, sizeof (snapid),
&size_buf, sizeof (size_buf));
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
&rbd_dev->header_oloc, "get_size",
&snapid, sizeof(snapid),
&size_buf, sizeof(size_buf));
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
return ret;
@ -4979,9 +4953,9 @@ static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev)
if (!reply_buf)
return -ENOMEM;
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
"rbd", "get_object_prefix", NULL, 0,
reply_buf, RBD_OBJ_PREFIX_LEN_MAX);
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
&rbd_dev->header_oloc, "get_object_prefix",
NULL, 0, reply_buf, RBD_OBJ_PREFIX_LEN_MAX);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
goto out;
@ -5014,10 +4988,10 @@ static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
u64 unsup;
int ret;
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
"rbd", "get_features",
&snapid, sizeof (snapid),
&features_buf, sizeof (features_buf));
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
&rbd_dev->header_oloc, "get_features",
&snapid, sizeof(snapid),
&features_buf, sizeof(features_buf));
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
return ret;
@ -5076,10 +5050,9 @@ static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
}
snapid = cpu_to_le64(rbd_dev->spec->snap_id);
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
"rbd", "get_parent",
&snapid, sizeof (snapid),
reply_buf, size);
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
&rbd_dev->header_oloc, "get_parent",
&snapid, sizeof(snapid), reply_buf, size);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
goto out_err;
@ -5179,9 +5152,9 @@ static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev)
u64 stripe_count;
int ret;
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
"rbd", "get_stripe_unit_count", NULL, 0,
(char *)&striping_info_buf, size);
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
&rbd_dev->header_oloc, "get_stripe_unit_count",
NULL, 0, &striping_info_buf, size);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
return ret;
@ -5218,6 +5191,7 @@ static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev)
static char *rbd_dev_image_name(struct rbd_device *rbd_dev)
{
CEPH_DEFINE_OID_ONSTACK(oid);
size_t image_id_size;
char *image_id;
void *p;
@ -5245,10 +5219,10 @@ static char *rbd_dev_image_name(struct rbd_device *rbd_dev)
if (!reply_buf)
goto out;
ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY,
"rbd", "dir_get_name",
image_id, image_id_size,
reply_buf, size);
ceph_oid_printf(&oid, "%s", RBD_DIRECTORY);
ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc,
"dir_get_name", image_id, image_id_size,
reply_buf, size);
if (ret < 0)
goto out;
p = reply_buf;
@ -5427,9 +5401,9 @@ static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev)
if (!reply_buf)
return -ENOMEM;
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
"rbd", "get_snapcontext", NULL, 0,
reply_buf, size);
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
&rbd_dev->header_oloc, "get_snapcontext",
NULL, 0, reply_buf, size);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
goto out;
@ -5492,10 +5466,9 @@ static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev,
return ERR_PTR(-ENOMEM);
snapid = cpu_to_le64(snap_id);
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name,
"rbd", "get_snapshot_name",
&snapid, sizeof (snapid),
reply_buf, size);
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
&rbd_dev->header_oloc, "get_snapshot_name",
&snapid, sizeof(snapid), reply_buf, size);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0) {
snap_name = ERR_PTR(ret);
@ -5802,7 +5775,7 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
{
int ret;
size_t size;
char *object_name;
CEPH_DEFINE_OID_ONSTACK(oid);
void *response;
char *image_id;
@ -5822,12 +5795,12 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
* First, see if the format 2 image id file exists, and if
* so, get the image's persistent id from it.
*/
size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name);
object_name = kmalloc(size, GFP_NOIO);
if (!object_name)
return -ENOMEM;
sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name);
dout("rbd id object name is %s\n", object_name);
ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX,
rbd_dev->spec->image_name);
if (ret)
return ret;
dout("rbd id object name is %s\n", oid.name);
/* Response will be an encoded string, which includes a length */
@ -5840,9 +5813,9 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
/* If it doesn't exist we'll assume it's a format 1 image */
ret = rbd_obj_method_sync(rbd_dev, object_name,
"rbd", "get_id", NULL, 0,
response, RBD_IMAGE_ID_LEN_MAX);
ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc,
"get_id", NULL, 0,
response, RBD_IMAGE_ID_LEN_MAX);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret == -ENOENT) {
image_id = kstrdup("", GFP_KERNEL);
@ -5865,8 +5838,7 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
}
out:
kfree(response);
kfree(object_name);
ceph_oid_destroy(&oid);
return ret;
}