pass a struct path to vfs_statfs

We'll need the path to implement the flags field for statvfs support.
We do have it available in all callers except:

 - ecryptfs_statfs.  This one doesn't actually need vfs_statfs but just
   needs to do a caller to the lower filesystem statfs method.
 - sys_ustat.  Add a non-exported statfs_by_dentry helper for it which
   doesn't won't be able to fill out the flags field later on.

In addition rename the helpers for statfs vs fstatfs to do_*statfs instead
of the misleading vfs prefix.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index ac17a708023..4d6154f66e0 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1756,6 +1756,10 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
         struct nfs4_acl *acl = NULL;
         struct nfsd4_compoundres *resp = rqstp->rq_resp;
         u32 minorversion = resp->cstate.minorversion;
+        struct path path = {
+                .mnt    = exp->ex_path.mnt,
+                .dentry = dentry,
+        };
 
         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
@@ -1776,7 +1780,7 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
                         FATTR4_WORD0_MAXNAME)) ||
             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
                        FATTR4_WORD1_SPACE_TOTAL))) {
-                err = vfs_statfs(dentry, &statfs);
+                err = vfs_statfs(&path, &statfs);
                 if (err)
                         goto out_nfserr;
         }