Ceph » CephFS

rdlock does, actually. The problem was specifically the LOCK->SYNC transition allows rdlock on auth, when it shouldn't.

broken result: rdlock succeedes during lock->sync:

10.05.03 13:56:19.316016 7fb391bb0910 mds0.locker rdlock_start on (ifile lock->sync w=1) on [inode 10000000006 [...2,head] /s/2/ auth v48 pv50 ap=3 f(v0 m10.05.03 13:56:10.607981 6=6+0) ds=6=6+0 rb=0(0/0) rf=6(7/7) rd=1(1/1) (iauth sync) (ilink sync) (idft sync) (isnap sync r=1) (inest mix w=1) (ifile lock->s
ync w=1) (ixattr sync) (iversion lock w=1 last_client=4110) caps={4108=pAsLsXs/p@23,4110=pAsLsXs/-@15} | nref=9 0x7fb388019a90]
10.05.03 13:56:19.316053 7fb391bb0910 mds0.locker got rdlock on (ifile lock->sync r=1 w=1) [inode 10000000006 [...2,head] /s/2/ auth v48 pv50 ap=3 f(v0 m10.05.03 13:56:10.607981 6=6+0) ds=6=6+0 rb=0(0/0) rf=6(7/7) rd=1(1/1) (iauth sync) (ilink sync) (idft sync) (isnap sync r=1) (inest mix w=1) (ifile lock->sy
nc r=1 w=1) (ixattr sync) (iversion lock w=1 last_client=4110) caps={4108=pAsLsXs/p@23,4110=pAsLsXs/-@15} | nref=10 0x7fb388019a90]