Cleanup sparse file support by creating worker function for it

Simply move code to new function (for clarity). Function sets or clears
the sparse file attribute flag.

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: David Disseldorp <ddiss@samba.org>

fs/cifs/smb2ops.c

@@ -731,6 +731,52 @@ smb2_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
 	return SMB2_write(xid, parms, written, iov, nr_segs);
 }
 
+/* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
+static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
+		struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
+{
+	struct cifsInodeInfo *cifsi;
+	int rc;
+
+	cifsi = CIFS_I(inode);
+
+	/* if file already sparse don't bother setting sparse again */
+	if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
+		return true; /* already sparse */
+
+	if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
+		return true; /* already not sparse */
+
+	/*
+	 * Can't check for sparse support on share the usual way via the
+	 * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
+	 * since Samba server doesn't set the flag on the share, yet
+	 * supports the set sparse FSCTL and returns sparse correctly
+	 * in the file attributes. If we fail setting sparse though we
+	 * mark that server does not support sparse files for this share
+	 * to avoid repeatedly sending the unsupported fsctl to server
+	 * if the file is repeatedly extended.
+	 */
+	if (tcon->broken_sparse_sup)
+		return false;
+
+	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
+			cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
+			true /* is_fctl */, &setsparse, 1, NULL, NULL);
+	if (rc) {
+		tcon->broken_sparse_sup = true;
+		cifs_dbg(FYI, "set sparse rc = %d\n", rc);
+		return false;
+	}
+
+	if (setsparse)
+		cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
+	else
+		cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
+
+	return true;
+}
+
 static int
 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
 		   struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
@@ -745,40 +791,12 @@ smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
 	inode = cfile->dentry->d_inode;
 
 	if (!set_alloc && (size > inode->i_size + 8192)) {
-		struct cifsInodeInfo *cifsi;
 		__u8 set_sparse = 1;
-		int rc;
 
-		cifsi = CIFS_I(inode);
-
-		/* if file already sparse or no server support don't bother */
-		if (cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)
-			goto smb2_set_eof;
-
-		/*
-		 * Can't check for sparse support on share the usual way via the
-		 * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
-		 * since Samba server doesn't set the flag on the share, yet
-		 * supports the set sparse FSCTL and returns sparse correctly
-		 * in the file attributes. If we fail setting sparse though we
-		 * mark that server does not support sparse files for this share
-		 * to avoid repeatedly sending the unsupported fsctl to server
-		 * if the file is repeatedly extended.
-		 */
-		if (tcon->broken_sparse_sup)
-			goto smb2_set_eof;
-
-		rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
-				cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
-				true /* is_fctl */, &set_sparse, 1, NULL, NULL);
-		if (rc) {
-			tcon->broken_sparse_sup = true;
-			cifs_dbg(FYI, "set sparse rc = %d\n", rc);
-		} else
-			cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
+		/* whether set sparse succeeds or not, extend the file */
+		smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
 	}
 
-smb2_set_eof:
 	return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
 			    cfile->fid.volatile_fid, cfile->pid, &eof, false);
 }