more fallocate fixes

more fallocate fixes

[Ronnie Sahlberg]

Steve,
another small patch.
This to handle the case where fallocate(mode==0) needs to extend a non-sparse
file.
In this case we can just call SMB2_set_eof() and the magic should happen.

[PATCH] cifs: fix fallocate(mode==0) for extending non-sparse files

[Ronnie Sahlberg]

Add support for the case when fallocate(mode==0) and we need to extend a
non-sparse file.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
---
 fs/cifs/smb2ops.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 32dde87feaa9..eee5a27ca95e 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -2718,6 +2718,7 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 	struct cifsFileInfo *cfile = file->private_data;
 	long rc = -EOPNOTSUPP;
 	unsigned int xid;
+	__le64 eof;
 
 	xid = get_xid();
 
@@ -2747,9 +2748,12 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 		else if (i_size_read(inode) >= off + len)
 			/* not extending file and already not sparse */
 			rc = 0;
-		/* BB: in future add else clause to extend file */
-		else
-			rc = -EOPNOTSUPP;
+		else {
+			eof = cpu_to_le64(off + len);
+			rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
+					  cfile->fid.volatile_fid,
+					  cfile->pid, &eof);
+		}
 		if (rc)
 			trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
 				tcon->tid, tcon->ses->Suid, off, len, rc);
-- 
2.13.6