tree 5b8c439ead3fd1c9ff42ad681149d76aa3eaaee7
parent fce7a9744bdf3baa9d08c52d2c78f53ab49918a4
author Luis Henriques <lhenriques@suse.com> 1539107668 +0100
committer Ilya Dryomov <idryomov@gmail.com> 1540196900 +0200

ceph: only allow punch hole mode in fallocate

Current implementation of cephfs fallocate isn't correct as it doesn't
really reserve the space in the cluster, which means that a subsequent
call to a write may actually fail due to lack of space.  In fact, it is
currently possible to fallocate an amount space that is larger than the
free space in the cluster.  It has behaved this way since the initial
commit ad7a60de882a ("ceph: punch hole support").

Since there's no easy solution to fix this at the moment, this patch
simply removes support for all fallocate operations but
FALLOC_FL_PUNCH_HOLE (which implies FALLOC_FL_KEEP_SIZE).

Link: https://tracker.ceph.com/issues/36317
Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>