libceph: calculate placement based on the internal data types

Instead of using the old ceph_object_layout struct, update our internal
ceph_calc_object_layout method to use the ceph_pg type.  This allows us to
pass the full 32-bit precision of the pgid.seed to the callers.  It also
allows some callers to avoid reaching into the request structures for the
struct ceph_object_layout fields.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>

fs/ceph/ioctl.c

@@ -185,7 +185,6 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 		&ceph_sb_to_client(inode->i_sb)->client->osdc;
 	u64 len = 1, olen;
 	u64 tmp;
-	struct ceph_object_layout ol;
 	struct ceph_pg pgid;
 	int r;
 
@@ -209,11 +208,9 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 
 	snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
 		 ceph_ino(inode), dl.object_no);
-	ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
+	ceph_calc_object_layout(&pgid, dl.object_name, &ci->i_layout,
 				osdc->osdmap);
 
-	pgid.pool = le32_to_cpu(ol.ol_pgid.pool);
-	pgid.seed = le16_to_cpu(ol.ol_pgid.ps);
 	dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 	if (dl.osd >= 0) {
 		struct ceph_entity_addr *a =

include/linux/ceph/osd_client.h

@@ -82,6 +82,7 @@ struct ceph_osd_request {
 
 	char              r_oid[MAX_OBJ_NAME_SIZE];          /* object name */
 	int               r_oid_len;
+	u64               r_snapid;
 	unsigned long     r_stamp;            /* send OR check time */
 
 	struct ceph_file_layout r_file_layout;

include/linux/ceph/osdmap.h

@@ -129,7 +129,7 @@ extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
 					 u64 *bno, u64 *oxoff, u64 *oxlen);
 
 /* calculate mapping of object to a placement group */
-extern int ceph_calc_object_layout(struct ceph_object_layout *ol,
+extern int ceph_calc_object_layout(struct ceph_pg *pg,
 				   const char *oid,
 				   struct ceph_file_layout *fl,
 				   struct ceph_osdmap *osdmap);

net/ceph/osd_client.c

@@ -913,21 +913,18 @@ EXPORT_SYMBOL(ceph_osdc_set_request_linger);
 static int __map_request(struct ceph_osd_client *osdc,
 			 struct ceph_osd_request *req, int force_resend)
 {
-	struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
 	struct ceph_pg pgid;
 	int acting[CEPH_PG_MAX_SIZE];
 	int o = -1, num = 0;
 	int err;
 
 	dout("map_request %p tid %lld\n", req, req->r_tid);
-	err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
+	err = ceph_calc_object_layout(&pgid, req->r_oid,
 				      &req->r_file_layout, osdc->osdmap);
 	if (err) {
 		list_move(&req->r_req_lru_item, &osdc->req_notarget);
 		return err;
 	}
-	pgid.pool = le32_to_cpu(reqhead->layout.ol_pgid.pool);
-	pgid.seed = le16_to_cpu(reqhead->layout.ol_pgid.ps);
 	req->r_pgid = pgid;
 
 	err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
@@ -1000,10 +997,16 @@ static void __send_request(struct ceph_osd_client *osdc,
 	     req, req->r_tid, req->r_osd->o_osd, req->r_flags);
 
 	reqhead = req->r_request->front.iov_base;
+	reqhead->snapid = cpu_to_le64(req->r_snapid);
 	reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
 	reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
 	reqhead->reassert_version = req->r_reassert_version;
 
+	reqhead->layout.ol_pgid.ps = cpu_to_le16(req->r_pgid.seed);
+	reqhead->layout.ol_pgid.pool = cpu_to_le32(req->r_pgid.pool);
+	reqhead->layout.ol_pgid.preferred = cpu_to_le16(-1);
+	reqhead->layout.ol_stripe_unit = 0;
+
 	req->r_stamp = jiffies;
 	list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
 

net/ceph/osdmap.c

@@ -1095,32 +1095,24 @@ EXPORT_SYMBOL(ceph_calc_file_object_mapping);
  * calculate an object layout (i.e. pgid) from an oid,
  * file_layout, and osdmap
  */
-int ceph_calc_object_layout(struct ceph_object_layout *ol,
+int ceph_calc_object_layout(struct ceph_pg *pg,
 			    const char *oid,
 			    struct ceph_file_layout *fl,
 			    struct ceph_osdmap *osdmap)
 {
 	unsigned int num, num_mask;
-	struct ceph_pg pgid;
 	struct ceph_pg_pool_info *pool;
 
 	BUG_ON(!osdmap);
-
-	pgid.pool = le32_to_cpu(fl->fl_pg_pool);
-	pool = __lookup_pg_pool(&osdmap->pg_pools, pgid.pool);
+	pg->pool = le32_to_cpu(fl->fl_pg_pool);
+	pool = __lookup_pg_pool(&osdmap->pg_pools, pg->pool);
 	if (!pool)
 		return -EIO;
-	pgid.seed = ceph_str_hash(pool->object_hash, oid, strlen(oid));
+	pg->seed = ceph_str_hash(pool->object_hash, oid, strlen(oid));
 	num = pool->pg_num;
 	num_mask = pool->pg_num_mask;
 
-	dout("calc_object_layout '%s' pgid %lld.%x\n", oid, pgid.pool,
-	     pgid.seed);
-
-	ol->ol_pgid.ps = cpu_to_le16(pgid.seed);
-	ol->ol_pgid.pool = fl->fl_pg_pool;
-	ol->ol_pgid.preferred = cpu_to_le16(-1);
-	ol->ol_stripe_unit = fl->fl_object_stripe_unit;
+	dout("calc_object_layout '%s' pgid %lld.%x\n", oid, pg->pool, pg->seed);
 	return 0;
 }
 EXPORT_SYMBOL(ceph_calc_object_layout);