nfsd: Ensure CLONE persists data and metadata changes to the target file

commit a25e3726b32c746c0098125d4c7463bb84df72bb upstream.

The NFSv4.2 CLONE operation has implicit persistence requirements on the
target file, since there is no protocol requirement that the client issue
a separate operation to persist data.
For that reason, we should call vfs_fsync_range() on the destination file
after a successful call to vfs_clone_file_range().

Fixes: ffa0160a1039 ("nfsd: implement the NFSv4.2 CLONE operation")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.5+
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 4e3e77b..38c0aed 100644 (file)
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1077,7 +1077,8 @@ nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                goto out;
 
        status = nfsd4_clone_file_range(src->nf_file, clone->cl_src_pos,
-                       dst->nf_file, clone->cl_dst_pos, clone->cl_count);
+                       dst->nf_file, clone->cl_dst_pos, clone->cl_count,
+                       EX_ISSYNC(cstate->current_fh.fh_export));
 
        nfsd_file_put(dst);
        nfsd_file_put(src);

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index bd0a385..cf423fe 100644 (file)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -525,7 +525,7 @@ __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp,
 #endif
 
 __be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst,
-               u64 dst_pos, u64 count)
+               u64 dst_pos, u64 count, bool sync)
 {
        loff_t cloned;
 
@@ -534,6 +534,12 @@ __be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst,
                return nfserrno(cloned);
        if (count && cloned != count)
                return nfserrno(-EINVAL);
+       if (sync) {
+               loff_t dst_end = count ? dst_pos + count - 1 : LLONG_MAX;
+               int status = vfs_fsync_range(dst, dst_pos, dst_end, 0);
+               if (status < 0)
+                       return nfserrno(status);
+       }
        return 0;
 }
 

diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index a13fd9d..cc110a1 100644 (file)
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -56,7 +56,7 @@ __be32          nfsd4_set_nfs4_label(struct svc_rqst *, struct svc_fh *,
 __be32         nfsd4_vfs_fallocate(struct svc_rqst *, struct svc_fh *,
                                    struct file *, loff_t, loff_t, int);
 __be32         nfsd4_clone_file_range(struct file *, u64, struct file *,
-                       u64, u64);
+                                      u64, u64, bool);
 #endif /* CONFIG_NFSD_V4 */
 __be32         nfsd_create_locked(struct svc_rqst *, struct svc_fh *,
                                char *name, int len, struct iattr *attrs,