fs/overlayfs/params.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <linux/fs_context.h>
   4 #include <linux/fs_parser.h>
   5
   6 struct ovl_fs;
   7 struct ovl_config;
   8
   9 extern const struct fs_parameter_spec ovl_parameter_spec[];
  10 extern const struct constant_table ovl_parameter_redirect_dir[];
  11
  12 /* The set of options that user requested explicitly via mount options */
  13 struct ovl_opt_set {
  14         bool metacopy;
  15         bool redirect;
  16         bool nfs_export;
  17         bool index;
  18 };
  19
  20 #define OVL_MAX_STACK 500
  21
  22 struct ovl_fs_context_layer {
  23         char *name;
  24         struct path path;
  25 };
  26
  27 struct ovl_fs_context {
  28         struct path upper;
  29         struct path work;
  30         size_t capacity;
  31         size_t nr; /* includes nr_data */
  32         size_t nr_data;
  33         struct ovl_opt_set set;
  34         struct ovl_fs_context_layer *lower;
  35         char *lowerdir_all; /* user provided lowerdir string */
  36 };
  37
  38 int ovl_init_fs_context(struct fs_context *fc);
  39 void ovl_free_fs(struct ovl_fs *ofs);
  40 int ovl_fs_params_verify(const struct ovl_fs_context *ctx,
  41                          struct ovl_config *config);
  42 int ovl_show_options(struct seq_file *m, struct dentry *dentry);
  43 const char *ovl_xino_mode(struct ovl_config *config);