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ceph: more accurate statfs

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Improve accuracy of statfs reporting for Ceph filesystems comprising
exactly one data pool. In this case, the Ceph monitor can now report
the space usage for the single data pool instead of the global data
for the entire Ceph cluster. Include support for this message in
mon_client and leverage it in ceph/super.

Signed-off-by: Douglas Fuller <dfuller@redhat.com>
Reviewed-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Douglas Fuller
2017-08-16 10:19:27 -04:00
committed by Ilya Dryomov
parent 92776fd2c2
commit 06d74376c8
4 changed files with 17 additions and 4 deletions
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9
fs/ceph/super.c
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@@ -49,9 +49,16 @@ static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
struct ceph_statfs st;
u64 fsid;
int err;
u64 data_pool;
if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
} else {
data_pool = CEPH_NOPOOL;
}
dout("statfs\n");
err = ceph_monc_do_statfs(&fsc->client->monc, &st);
err = ceph_monc_do_statfs(&fsc->client->monc, data_pool, &st);
if (err < 0)
return err;