fs/ceph/snap.c

32  * snapshots.  An individual realm's snap set contains snapshots
34  * parent's snap set _after_ the point at which the parent became it's
44  * with an open cap in the system.  (The needed snap realm information is
49  * The realm hierarchy drives the generation of a 'snap context' for each
54  * Unfortunately error handling is a bit mixed here.  If we get a snap
333  * build the snap context for a given realm.
375 	/* alloc new snap context */
383 	/* build (reverse sorted) snap vector */
431  * rebuild snap context for the given realm and all of its children.
719  * Queue cap_snaps for snap writeback for this realm and its children.
773  * Parse and apply a snapblob "snap trace" from the MDS.  This specifies
774  * the snap realm parameters from a given realm and all of its ancestors,
830 		/* update realm parameters, snap lists */
884 	 * queue cap snaps _after_ we've built the new snap contexts,
912 	 * When receiving a corrupted snap trace we don't know what
938  * s_mutex across multiple snap flushes to avoid locking overhead.
969  * @inode: inode to move to new snap realm
973  * the new snaprealm (if any). The old snap realm reference held by
1006  * Handle a snap notification from the MDS.
1008  * This can take two basic forms: the simplest is just a snap creation
1012  * The more difficult case is realm creation, due to snap creation at a
1087 				.snap = CEPH_NOSNAP,
1152 	 * update using the provided snap trace. if we are deleting a
1153 	 * snap, we can avoid queueing cap_snaps.
1175 	pr_err_client(cl, "corrupt snap message from mds%d\n", mds);
1189 					    u64 snap)
1201 		if (snap > exist->snap) {
1203 		} else if (snap < exist->snap) {
1214 		doutc(cl, "found snapid map %llx -> %x\n", exist->snap,
1231 	sm->snap = snap;
1240 		if (snap > exist->snap)
1242 		else if (snap < exist->snap)
1259 		doutc(cl, "found snapid map %llx -> %x\n", exist->snap,
1264 	doutc(cl, "create snapid map %llx -> %x\n", sm->snap, sm->dev);
1311 		doutc(cl, "trim snapid map %llx -> %x\n", sm->snap, sm->dev);
1339 				      sm->snap, sm->dev);