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Commit a86f009f authored by Ilya Dryomov's avatar Ilya Dryomov
Browse files

libceph: allocate the locator string with GFP_NOFAIL 



calc_target() isn't supposed to fail with anything but POOL_DNE, in
which case we report that the pool doesn't exist and fail the request
with -ENOENT.  Doing this for -ENOMEM is at the very least confusing
and also harmful -- as the preceding requests complete, a short-lived
locator string allocation is likely to succeed after a wait.

(We used to call ceph_object_locator_to_pg() for a pi lookup.  In
theory that could fail with -ENOENT, hence the "ret != -ENOENT" warning
being removed.)

Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent c843d13c

include/linux/ceph/osdmap.h

+4 −4
Original line number Diff line number Diff line
@@ -279,7 +279,7 @@ bool ceph_osds_changed(const struct ceph_osds *old_acting, 
		       const struct ceph_osds *new_acting,

		       bool any_change);



int __ceph_object_locator_to_pg(struct ceph_pg_pool_info *pi,

void __ceph_object_locator_to_pg(struct ceph_pg_pool_info *pi,

				 const struct ceph_object_id *oid,

				 const struct ceph_object_locator *oloc,

				 struct ceph_pg *raw_pgid);

net/ceph/osd_client.c

+1 −9
Original line number Diff line number Diff line
@@ -1430,7 +1430,6 @@ static enum calc_target_result calc_target(struct ceph_osd_client *osdc, 
	bool recovery_deletes = ceph_osdmap_flag(osdc,

						 CEPH_OSDMAP_RECOVERY_DELETES);

	enum calc_target_result ct_res;

	int ret;



	t->epoch = osdc->osdmap->epoch;

	pi = ceph_pg_pool_by_id(osdc->osdmap, t->base_oloc.pool);
@@ -1466,14 +1465,7 @@ static enum calc_target_result calc_target(struct ceph_osd_client *osdc, 
		}

	}



	ret = __ceph_object_locator_to_pg(pi, &t->target_oid, &t->target_oloc,

					  &pgid);

	if (ret) {

		WARN_ON(ret != -ENOENT);

		t->osd = CEPH_HOMELESS_OSD;

		ct_res = CALC_TARGET_POOL_DNE;

		goto out;

	}

	__ceph_object_locator_to_pg(pi, &t->target_oid, &t->target_oloc, &pgid);

	last_pgid.pool = pgid.pool;

	last_pgid.seed = ceph_stable_mod(pgid.seed, t->pg_num, t->pg_num_mask);

net/ceph/osdmap.c

+8 −11
Original line number Diff line number Diff line
@@ -2145,7 +2145,7 @@ bool ceph_osds_changed(const struct ceph_osds *old_acting, 
 * Should only be called with target_oid and target_oloc (as opposed to

 * base_oid and base_oloc), since tiering isn't taken into account.

 */

int __ceph_object_locator_to_pg(struct ceph_pg_pool_info *pi,

void __ceph_object_locator_to_pg(struct ceph_pg_pool_info *pi,

				 const struct ceph_object_id *oid,

				 const struct ceph_object_locator *oloc,

				 struct ceph_pg *raw_pgid)
@@ -2164,11 +2164,8 @@ int __ceph_object_locator_to_pg(struct ceph_pg_pool_info *pi, 
		int nsl = oloc->pool_ns->len;

		size_t total = nsl + 1 + oid->name_len;



		if (total > sizeof(stack_buf)) {

			buf = kmalloc(total, GFP_NOIO);

			if (!buf)

				return -ENOMEM;

		}

		if (total > sizeof(stack_buf))

			buf = kmalloc(total, GFP_NOIO | __GFP_NOFAIL);

		memcpy(buf, oloc->pool_ns->str, nsl);

		buf[nsl] = '\037';

		memcpy(buf + nsl + 1, oid->name, oid->name_len);
@@ -2180,7 +2177,6 @@ int __ceph_object_locator_to_pg(struct ceph_pg_pool_info *pi, 
		     oid->name, nsl, oloc->pool_ns->str,

		     raw_pgid->pool, raw_pgid->seed);

	}

	return 0;

}



int ceph_object_locator_to_pg(struct ceph_osdmap *osdmap,
@@ -2194,7 +2190,8 @@ int ceph_object_locator_to_pg(struct ceph_osdmap *osdmap, 
	if (!pi)

		return -ENOENT;



	return __ceph_object_locator_to_pg(pi, oid, oloc, raw_pgid);

	__ceph_object_locator_to_pg(pi, oid, oloc, raw_pgid);

	return 0;

}

EXPORT_SYMBOL(ceph_object_locator_to_pg);