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rbd: extract a method for adding object operations

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rbd_img_request_fill() creates a ceph_osd_request and has logic for
adding the appropriate osd ops to it based on the request type and
image properties.

For layered images, the original rbd_obj_request is resent with a
copyup operation in front, using a new ceph_osd_request. The logic for
adding the original operations should be the same as when first
sending them, so move it to a helper function.

op_type only needs to be checked once, so create a helper for that as
well and call it outside the loop in rbd_img_request_fill().

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Josh Durgin 2014-04-04 17:32:15 -07:00 committed by Ilya Dryomov
parent 1c220881e3
commit 3b434a2aff
1 changed files with 79 additions and 56 deletions
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135
drivers/block/rbd.c
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@ -1672,6 +1672,17 @@ static bool img_request_layered_test(struct rbd_img_request *img_request)
return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0;
}
static enum obj_operation_type
rbd_img_request_op_type(struct rbd_img_request *img_request)
{
if (img_request_write_test(img_request))
return OBJ_OP_WRITE;
else if (img_request_discard_test(img_request))
return OBJ_OP_DISCARD;
else
return OBJ_OP_READ;
}
static void
rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request)
{
@ -2307,6 +2318,68 @@ out:
rbd_img_request_complete(img_request);
}
/*
* Add individual osd ops to the given ceph_osd_request and prepare
* them for submission. num_ops is the current number of
* osd operations already to the object request.
*/
static void rbd_img_obj_request_fill(struct rbd_obj_request *obj_request,
struct ceph_osd_request *osd_request,
enum obj_operation_type op_type,
unsigned int num_ops)
{
struct rbd_img_request *img_request = obj_request->img_request;
struct rbd_device *rbd_dev = img_request->rbd_dev;
u64 object_size = rbd_obj_bytes(&rbd_dev->header);
u64 offset = obj_request->offset;
u64 length = obj_request->length;
u64 img_end;
u16 opcode;
if (op_type == OBJ_OP_DISCARD) {
if (!offset && (length == object_size)
&& (!img_request_layered_test(img_request) ||
(rbd_dev->parent_overlap <=
obj_request->img_offset))) {
opcode = CEPH_OSD_OP_DELETE;
} else if ((offset + length == object_size)) {
opcode = CEPH_OSD_OP_TRUNCATE;
} else {
down_read(&rbd_dev->header_rwsem);
img_end = rbd_dev->header.image_size;
up_read(&rbd_dev->header_rwsem);
if (obj_request->img_offset + length == img_end)
opcode = CEPH_OSD_OP_TRUNCATE;
else
opcode = CEPH_OSD_OP_ZERO;
}
} else if (op_type == OBJ_OP_WRITE) {
opcode = CEPH_OSD_OP_WRITE;
osd_req_op_alloc_hint_init(osd_request, num_ops,
object_size, object_size);
num_ops++;
} else {
opcode = CEPH_OSD_OP_READ;
}
osd_req_op_extent_init(osd_request, num_ops, opcode, offset, length,
0, 0);
if (obj_request->type == OBJ_REQUEST_BIO)
osd_req_op_extent_osd_data_bio(osd_request, num_ops,
obj_request->bio_list, length);
else if (obj_request->type == OBJ_REQUEST_PAGES)
osd_req_op_extent_osd_data_pages(osd_request, num_ops,
obj_request->pages, length,
offset & ~PAGE_MASK, false, false);
/* Discards are also writes */
if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD)
rbd_osd_req_format_write(obj_request);
else
rbd_osd_req_format_read(obj_request);
}
/*
* Split up an image request into one or more object requests, each
* to a different object. The "type" parameter indicates whether
@ -2326,11 +2399,8 @@ static int rbd_img_request_fill(struct rbd_img_request *img_request,
unsigned int bio_offset = 0;
struct page **pages = NULL;
enum obj_operation_type op_type;
u64 object_size = rbd_obj_bytes(&rbd_dev->header);
u64 img_offset;
u64 img_end;
u64 resid;
u16 opcode;
dout("%s: img %p type %d data_desc %p\n", __func__, img_request,
(int)type, data_desc);
@ -2338,6 +2408,7 @@ static int rbd_img_request_fill(struct rbd_img_request *img_request,
img_offset = img_request->offset;
resid = img_request->length;
rbd_assert(resid > 0);
op_type = rbd_img_request_op_type(img_request);
if (type == OBJ_REQUEST_BIO) {
bio_list = data_desc;
@ -2352,7 +2423,6 @@ static int rbd_img_request_fill(struct rbd_img_request *img_request,
const char *object_name;
u64 offset;
u64 length;
unsigned int which = 0;
object_name = rbd_segment_name(rbd_dev, img_offset);
if (!object_name)
@ -2395,67 +2465,20 @@ static int rbd_img_request_fill(struct rbd_img_request *img_request,
pages += page_count;
}
if (img_request_discard_test(img_request)) {
op_type = OBJ_OP_DISCARD;
if (!offset && (length == object_size)
&& (!img_request_layered_test(img_request) ||
(rbd_dev->parent_overlap <=
obj_request->img_offset))) {
opcode = CEPH_OSD_OP_DELETE;
} else if ((offset + length == object_size)) {
opcode = CEPH_OSD_OP_TRUNCATE;
} else {
down_read(&rbd_dev->header_rwsem);
img_end = rbd_dev->header.image_size;
up_read(&rbd_dev->header_rwsem);
if (obj_request->img_offset + length == img_end)
opcode = CEPH_OSD_OP_TRUNCATE;
else
opcode = CEPH_OSD_OP_ZERO;
}
} else if (img_request_write_test(img_request)) {
op_type = OBJ_OP_WRITE;
opcode = CEPH_OSD_OP_WRITE;
} else {
op_type = OBJ_OP_READ;
opcode = CEPH_OSD_OP_READ;
}
osd_req = rbd_osd_req_create(rbd_dev, op_type,
(op_type == OBJ_OP_WRITE) ? 2 : 1,
obj_request);
if (!osd_req)
goto out_unwind;
obj_request->osd_req = osd_req;
obj_request->callback = rbd_img_obj_callback;
rbd_img_request_get(img_request);
if (op_type == OBJ_OP_WRITE) {
osd_req_op_alloc_hint_init(osd_req, which,
rbd_obj_bytes(&rbd_dev->header),
rbd_obj_bytes(&rbd_dev->header));
which++;
}
osd_req_op_extent_init(osd_req, which, opcode, offset, length,
0, 0);
if (type == OBJ_REQUEST_BIO)
osd_req_op_extent_osd_data_bio(osd_req, which,
obj_request->bio_list, length);
else if (type == OBJ_REQUEST_PAGES)
osd_req_op_extent_osd_data_pages(osd_req, which,
obj_request->pages, length,
offset & ~PAGE_MASK, false, false);
/* Discards are also writes */
if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD)
rbd_osd_req_format_write(obj_request);
else
rbd_osd_req_format_read(obj_request);
obj_request->img_offset = img_offset;
rbd_img_obj_request_fill(obj_request, osd_req, op_type, 0);
rbd_img_request_get(img_request);
img_offset += length;
resid -= length;
}