[PATCH 5.3 068/105] nfsd: Ensure CLONE persists data and metadata changes to the target file

Greg Kroah-Hartman
2019-12-11T16:00:02Z

From: Trond Myklebust <trondmy@gmail.com>

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>

---
fs/nfsd/nfs4proc.c | 3 ++-
fs/nfsd/vfs.c | 8 +++++++-
fs/nfsd/vfs.h | 2 +-
3 files changed, 10 insertions(+), 3 deletions(-)

--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1083,7 +1083,8 @@ nfsd4_clone(struct svc_rqst *rqstp, stru
goto out;

status = nfsd4_clone_file_range(src, clone->cl_src_pos,
- dst, clone->cl_dst_pos, clone->cl_count);
+ dst, clone->cl_dst_pos, clone->cl_count,
+ EX_ISSYNC(cstate->current_fh.fh_export));

fput(dst);
fput(src);
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -552,7 +552,7 @@ __be32 nfsd4_set_nfs4_label(struct svc_r
#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;

@@ -561,6 +561,12 @@ __be32 nfsd4_clone_file_range(struct fil
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;
}

--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -58,7 +58,7 @@ __be32 nfsd4_set_nfs4_label(str
__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,