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Commit 8adc8b3d authored by Sage Weil's avatar Sage Weil
Browse files

libceph: fix pg_temp mapping update 



The incremental map updates have a record for each pg_temp mapping that is
to be add/updated (len > 0) or removed (len == 0).  The old code was
written as if the updates were a complete enumeration; that was just wrong.
Update the code to remove 0-length entries and drop the rbtree traversal.

This avoids misdirected (and hung) requests that manifest as server
errors like

[WRN] client4104 10.0.1.219:0/275025290 misdirected client4104.1:129 0.1 to osd0 not [1,0] in e11/11

Signed-off-by: default avatarSage Weil <sage@newdream.net>
parent 782e182e

net/ceph/osdmap.c

+24 −26
Original line number Diff line number Diff line
@@ -339,6 +339,7 @@ static int __insert_pg_mapping(struct ceph_pg_mapping *new, 
	struct ceph_pg_mapping *pg = NULL;

	int c;



	dout("__insert_pg_mapping %llx %p\n", *(u64 *)&new->pgid, new);

	while (*p) {

		parent = *p;

		pg = rb_entry(parent, struct ceph_pg_mapping, node);
@@ -366,16 +367,33 @@ static struct ceph_pg_mapping *__lookup_pg_mapping(struct rb_root *root, 
	while (n) {

		pg = rb_entry(n, struct ceph_pg_mapping, node);

		c = pgid_cmp(pgid, pg->pgid);

		if (c < 0)

		if (c < 0) {

			n = n->rb_left;

		else if (c > 0)

		} else if (c > 0) {

			n = n->rb_right;

		else

		} else {

			dout("__lookup_pg_mapping %llx got %p\n",

			     *(u64 *)&pgid, pg);

			return pg;

		}

	}

	return NULL;

}



static int __remove_pg_mapping(struct rb_root *root, struct ceph_pg pgid)

{

	struct ceph_pg_mapping *pg = __lookup_pg_mapping(root, pgid);



	if (pg) {

		dout("__remove_pg_mapping %llx %p\n", *(u64 *)&pgid, pg);

		rb_erase(&pg->node, root);

		kfree(pg);

		return 0;

	}

	dout("__remove_pg_mapping %llx dne\n", *(u64 *)&pgid);

	return -ENOENT;

}



/*

 * rbtree of pg pool info

 */
@@ -711,7 +729,6 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, 
	void *start = *p;

	int err = -EINVAL;

	u16 version;

	struct rb_node *rbp;



	ceph_decode_16_safe(p, end, version, bad);

	if (version > CEPH_OSDMAP_INC_VERSION) {
@@ -861,7 +878,6 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, 
	}



	/* new_pg_temp */

	rbp = rb_first(&map->pg_temp);

	ceph_decode_32_safe(p, end, len, bad);

	while (len--) {

		struct ceph_pg_mapping *pg;
@@ -872,18 +888,6 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, 
		ceph_decode_copy(p, &pgid, sizeof(pgid));

		pglen = ceph_decode_32(p);



		/* remove any? */

		while (rbp && pgid_cmp(rb_entry(rbp, struct ceph_pg_mapping,

						node)->pgid, pgid) <= 0) {

			struct ceph_pg_mapping *cur =

				rb_entry(rbp, struct ceph_pg_mapping, node);



			rbp = rb_next(rbp);

			dout(" removed pg_temp %llx\n", *(u64 *)&cur->pgid);

			rb_erase(&cur->node, &map->pg_temp);

			kfree(cur);

		}



		if (pglen) {

			/* insert */

			ceph_decode_need(p, end, pglen*sizeof(u32), bad);
@@ -903,17 +907,11 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, 
			}

			dout(" added pg_temp %llx len %d\n", *(u64 *)&pgid,

			     pglen);

		} else {

			/* remove */

			__remove_pg_mapping(&map->pg_temp, pgid);

		}

	}

	while (rbp) {

		struct ceph_pg_mapping *cur =

			rb_entry(rbp, struct ceph_pg_mapping, node);



		rbp = rb_next(rbp);

		dout(" removed pg_temp %llx\n", *(u64 *)&cur->pgid);

		rb_erase(&cur->node, &map->pg_temp);

		kfree(cur);

	}



	/* ignore the rest */

	*p = end;