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ceph: properly handle statfs on multifs setups 

ceph_statfs currently stuffs the cluster fsid into the f_fsid field.
This was fine when we only had a single filesystem per cluster, but now
that we have multiples we need to use something that will vary between
them.

Change ceph_statfs to xor each 32-bit chunk of the fsid (aka cluster id)
into the lower bits of the statfs->f_fsid. Change the lower bits to hold
the fscid (filesystem ID within the cluster).

That should give us a value that is guaranteed to be unique between
filesystems within a cluster, and should minimize the chance of
collisions between mounts of different clusters.

URL: https://tracker.ceph.com/issues/52812
Reported-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton 2021-10-05 11:12:58 -04:00 committed by Ilya Dryomov
parent 631ed4b082
commit 8cfc0c7ed3
1 changed files with 6 additions and 5 deletions
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11
fs/ceph/super.c
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@ -52,8 +52,7 @@ static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
struct ceph_mon_client *monc = &fsc->client->monc;
struct ceph_statfs st;
u64 fsid;
int err;
int i, err;
u64 data_pool;
if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
@ -99,12 +98,14 @@ static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_namelen = NAME_MAX;
/* Must convert the fsid, for consistent values across arches */
buf->f_fsid.val[0] = 0;
mutex_lock(&monc->mutex);
fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
for (i = 0 ; i < sizeof(monc->monmap->fsid) / sizeof(__le32) ; ++i)
buf->f_fsid.val[0] ^= le32_to_cpu(((__le32 *)&monc->monmap->fsid)[i]);
mutex_unlock(&monc->mutex);
buf->f_fsid = u64_to_fsid(fsid);
/* fold the fs_cluster_id into the upper bits */
buf->f_fsid.val[1] = monc->fs_cluster_id;
return 0;
}