vfs: implement POSIX append-IO in vfs_pwrite_data()

This basically just avoids clobbering a possible offset=VFS_PWRITE_APPEND_OFFSET
when calling SMB_VFS_PWRITE().

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

diff --git a/source3/smbd/vfs.c b/source3/smbd/vfs.c
index 76732691c0913a36960b9f5a1ae89e555627b9f6..c5be257c0d353e7c0eb4e4d80e933f46575accd5 100644 (file)
--- a/source3/smbd/vfs.c
+++ b/source3/smbd/vfs.c
@@ -520,9 +520,14 @@ ssize_t vfs_pwrite_data(struct smb_request *req,
        }
 
        while (total < N) {
-               ret = SMB_VFS_PWRITE(fsp, buffer + total, N - total,
-                                    offset + total);
-
+               off_t pwrite_offset = offset;
+               if (offset != VFS_PWRITE_APPEND_OFFSET) {
+                       pwrite_offset += total;
+               }
+               ret = SMB_VFS_PWRITE(fsp,
+                                    buffer + total,
+                                    N - total,
+                                    pwrite_offset);
                if (ret == -1)
                        return -1;
                if (ret == 0)