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rbd: pull in ceph_calc_raw_layout() 

This is the first in a series of patches aimed at eliminating
the use of ceph_calc_raw_layout() by rbd.

It simply pulls in a copy of that function and renames it
rbd_calc_raw_layout().

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-11-14 12:25:18 -06:00
parent 2b5fc648af
commit 0829661863
1 changed files with 35 additions and 1 deletions
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36
drivers/block/rbd.c
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@ -1101,6 +1101,40 @@ static void rbd_layout_init(struct ceph_file_layout *layout, u64 pool_id)
layout->fl_pg_pool = cpu_to_le32((u32) pool_id);
}
int rbd_calc_raw_layout(struct ceph_file_layout *layout,
u64 off, u64 *plen, u64 *bno,
struct ceph_osd_request *req,
struct ceph_osd_req_op *op)
{
u64 orig_len = *plen;
u64 objoff, objlen; /* extent in object */
int r;
/* object extent? */
r = ceph_calc_file_object_mapping(layout, off, orig_len, bno,
&objoff, &objlen);
if (r < 0)
return r;
if (objlen < orig_len) {
*plen = objlen;
dout(" skipping last %llu, final file extent %llu~%llu\n",
orig_len - *plen, off, *plen);
}
if (op->op == CEPH_OSD_OP_READ || op->op == CEPH_OSD_OP_WRITE) {
op->extent.offset = objoff;
op->extent.length = objlen;
}
req->r_num_pages = calc_pages_for(off, *plen);
req->r_page_alignment = off & ~PAGE_MASK;
if (op->op == CEPH_OSD_OP_WRITE)
op->payload_len = *plen;
dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
*bno, objoff, objlen, req->r_num_pages);
return 0;
}
/*
* Send ceph osd request
*/
@ -1167,7 +1201,7 @@ static int rbd_do_request(struct request *rq,
osd_req->r_oid_len = strlen(osd_req->r_oid);
rbd_layout_init(&osd_req->r_file_layout, rbd_dev->spec->pool_id);
ret = ceph_calc_raw_layout(&osd_req->r_file_layout,
ret = rbd_calc_raw_layout(&osd_req->r_file_layout,
ofs, &len, &bno, osd_req, op);
rbd_assert(ret == 0);