s3: VFS: vfs_xfs_sgid. Implement mkdirat().

Currently identical to mkdir().

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

diff --git a/source3/modules/vfs_linux_xfs_sgid.c b/source3/modules/vfs_linux_xfs_sgid.c
index b7c77069b8905c6aca8756064f28a1eddeb4a92a..1707bd0931ace8dd617988b4e4d6b9979e96a17d 100644 (file)
--- a/source3/modules/vfs_linux_xfs_sgid.c
+++ b/source3/modules/vfs_linux_xfs_sgid.c
@@ -95,8 +95,87 @@ static int linux_xfs_sgid_mkdir(vfs_handle_struct *handle,
        return mkdir_res;
 }
 
+static int linux_xfs_sgid_mkdirat(vfs_handle_struct *handle,
+               struct files_struct *dirfsp,
+               const struct smb_filename *smb_fname,
+               mode_t mode)
+{
+       struct smb_filename fname = { 0, };
+       int mkdir_res;
+       int res;
+
+       DEBUG(10, ("Calling linux_xfs_sgid_mkdirat(%s)\n",
+               smb_fname->base_name));
+
+       mkdir_res = SMB_VFS_NEXT_MKDIRAT(handle,
+                       dirfsp,
+                       smb_fname,
+                       mode);
+       if (mkdir_res == -1) {
+               DEBUG(10, ("SMB_VFS_NEXT_MKDIRAT returned error: %s\n",
+                          strerror(errno)));
+               return mkdir_res;
+       }
+
+       if (!parent_dirname(talloc_tos(),
+                       smb_fname->base_name,
+                       &fname.base_name,
+                       NULL)) {
+               DEBUG(1, ("parent_dirname failed\n"));
+               /* return success, we did the mkdir */
+               return mkdir_res;
+       }
+
+       res = SMB_VFS_NEXT_STAT(handle, &fname);
+       if (res == -1) {
+               DEBUG(10, ("NEXT_STAT(%s) failed: %s\n", fname.base_name,
+                          strerror(errno)));
+               /* return success, we did the mkdir */
+               return mkdir_res;
+       }
+       TALLOC_FREE(fname.base_name);
+       if ((fname.st.st_ex_mode & S_ISGID) == 0) {
+               /* No SGID to inherit */
+               DEBUG(10, ("No SGID to inherit\n"));
+               return mkdir_res;
+       }
+
+       fname.base_name = discard_const_p(char, smb_fname->base_name);
+
+       res = SMB_VFS_NEXT_STAT(handle, &fname);
+       if (res == -1) {
+               DEBUG(2, ("Could not stat just created dir %s: %s\n",
+                       smb_fname->base_name,
+                       strerror(errno)));
+               /* return success, we did the mkdir */
+               return mkdir_res;
+       }
+       fname.st.st_ex_mode |= S_ISGID;
+       fname.st.st_ex_mode &= ~S_IFDIR;
+
+       /*
+        * Yes, we have to do this as root. If you do it as
+        * non-privileged user, XFS on Linux will just ignore us and
+        * return success. What can you do...
+        */
+       become_root();
+       res = SMB_VFS_NEXT_CHMOD(handle,
+                       smb_fname,
+                       fname.st.st_ex_mode);
+       unbecome_root();
+
+       if (res == -1) {
+               DEBUG(2, ("CHMOD(%s, %o) failed: %s\n", smb_fname->base_name,
+                         (int)fname.st.st_ex_mode, strerror(errno)));
+               /* return success, we did the mkdir */
+               return mkdir_res;
+       }
+       return mkdir_res;
+}
+
 static struct vfs_fn_pointers linux_xfs_sgid_fns = {
        .mkdir_fn = linux_xfs_sgid_mkdir,
+       .mkdirat_fn = linux_xfs_sgid_mkdirat,
 };
 
 static_decl_vfs;