};
enum {
+ OVL_REDIRECT_OFF, /* "off" mode is never used. In effect */
+ OVL_REDIRECT_FOLLOW, /* ...it translates to either "follow" */
+ OVL_REDIRECT_NOFOLLOW, /* ...or "nofollow". */
+ OVL_REDIRECT_ON,
+};
+
+enum {
OVL_XINO_OFF,
OVL_XINO_AUTO,
OVL_XINO_ON,
};
+/* The set of options that user requested explicitly via mount options */
+struct ovl_opt_set {
+ bool metacopy;
+ bool redirect;
+ bool nfs_export;
+ bool index;
+};
+
/*
* The tuple (fh,uuid) is a universal unique identifier for a copy up origin,
* where:
return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC));
}
-static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs)
-{
- /*
- * To avoid regressions in existing setups with overlay lower offline
- * changes, we allow lower changes only if none of the new features
- * are used.
- */
- return (!ofs->config.index && !ofs->config.metacopy &&
- !ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON);
-}
+/* params.c */
+#define OVL_MAX_STACK 500
+
+struct ovl_fs_context_layer {
+ char *name;
+ struct path path;
+};
+
+struct ovl_fs_context {
+ struct path upper;
+ struct path work;
+ size_t capacity;
+ size_t nr; /* includes nr_data */
+ size_t nr_data;
+ struct ovl_opt_set set;
+ struct ovl_fs_context_layer *lower;
+};
+
+int ovl_parse_param_upperdir(const char *name, struct fs_context *fc,
+ bool workdir);
+int ovl_parse_param_lowerdir(const char *name, struct fs_context *fc);
+void ovl_parse_param_drop_lowerdir(struct ovl_fs_context *ctx);
/* util.c */
int ovl_want_write(struct dentry *dentry);
struct dentry *ovl_indexdir(struct super_block *sb);
bool ovl_index_all(struct super_block *sb);
bool ovl_verify_lower(struct super_block *sb);
+struct ovl_path *ovl_stack_alloc(unsigned int n);
+void ovl_stack_cpy(struct ovl_path *dst, struct ovl_path *src, unsigned int n);
+void ovl_stack_put(struct ovl_path *stack, unsigned int n);
+void ovl_stack_free(struct ovl_path *stack, unsigned int n);
struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
+void ovl_free_entry(struct ovl_entry *oe);
bool ovl_dentry_remote(struct dentry *dentry);
-void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry,
- unsigned int mask);
+void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *realdentry);
+void ovl_dentry_init_reval(struct dentry *dentry, struct dentry *upperdentry,
+ struct ovl_entry *oe);
+void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry,
+ struct ovl_entry *oe, unsigned int mask);
bool ovl_dentry_weird(struct dentry *dentry);
enum ovl_path_type ovl_path_type(struct dentry *dentry);
void ovl_path_upper(struct dentry *dentry, struct path *path);
void ovl_path_lower(struct dentry *dentry, struct path *path);
void ovl_path_lowerdata(struct dentry *dentry, struct path *path);
-void ovl_i_path_real(struct inode *inode, struct path *path);
+struct inode *ovl_i_path_real(struct inode *inode, struct path *path);
enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
enum ovl_path_type ovl_path_realdata(struct dentry *dentry, struct path *path);
struct dentry *ovl_dentry_upper(struct dentry *dentry);
struct dentry *ovl_dentry_lower(struct dentry *dentry);
struct dentry *ovl_dentry_lowerdata(struct dentry *dentry);
+int ovl_dentry_set_lowerdata(struct dentry *dentry, struct ovl_path *datapath);
const struct ovl_layer *ovl_i_layer_lower(struct inode *inode);
const struct ovl_layer *ovl_layer_lower(struct dentry *dentry);
struct dentry *ovl_dentry_real(struct dentry *dentry);
struct inode *ovl_inode_lowerdata(struct inode *inode);
struct inode *ovl_inode_real(struct inode *inode);
struct inode *ovl_inode_realdata(struct inode *inode);
+const char *ovl_lowerdata_redirect(struct inode *inode);
struct ovl_dir_cache *ovl_dir_cache(struct inode *inode);
void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache);
void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry);
bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags);
bool ovl_has_upperdata(struct inode *inode);
void ovl_set_upperdata(struct inode *inode);
-bool ovl_redirect_dir(struct super_block *sb);
const char *ovl_dentry_get_redirect(struct dentry *dentry);
void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
void ovl_inode_update(struct inode *inode, struct dentry *upperdentry);
return ovl_path_check_dir_xattr(ofs, &upperpath, OVL_XATTR_IMPURE);
}
+static inline bool ovl_redirect_follow(struct ovl_fs *ofs)
+{
+ return ofs->config.redirect_mode != OVL_REDIRECT_NOFOLLOW;
+}
+
+static inline bool ovl_redirect_dir(struct ovl_fs *ofs)
+{
+ return ofs->config.redirect_mode == OVL_REDIRECT_ON;
+}
+
/*
* With xino=auto, we do best effort to keep all inodes on same st_dev and
* d_ino consistent with st_ino.
* With xino=on, we do the same effort but we warn if we failed.
*/
-static inline bool ovl_xino_warn(struct super_block *sb)
+static inline bool ovl_xino_warn(struct ovl_fs *ofs)
{
- return OVL_FS(sb)->config.xino == OVL_XINO_ON;
+ return ofs->config.xino == OVL_XINO_ON;
+}
+
+/*
+ * To avoid regressions in existing setups with overlay lower offline changes,
+ * we allow lower changes only if none of the new features are used.
+ */
+static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs)
+{
+ return (!ofs->config.index && !ofs->config.metacopy &&
+ !ovl_redirect_dir(ofs) && !ovl_xino_warn(ofs));
}
/* All layers on same fs? */
-static inline bool ovl_same_fs(struct super_block *sb)
+static inline bool ovl_same_fs(struct ovl_fs *ofs)
{
- return OVL_FS(sb)->xino_mode == 0;
+ return ofs->xino_mode == 0;
}
/* All overlay inodes have same st_dev? */
-static inline bool ovl_same_dev(struct super_block *sb)
+static inline bool ovl_same_dev(struct ovl_fs *ofs)
{
- return OVL_FS(sb)->xino_mode >= 0;
+ return ofs->xino_mode >= 0;
}
-static inline unsigned int ovl_xino_bits(struct super_block *sb)
+static inline unsigned int ovl_xino_bits(struct ovl_fs *ofs)
{
- return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0;
+ return ovl_same_dev(ofs) ? ofs->xino_mode : 0;
}
static inline void ovl_inode_lock(struct inode *inode)
struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
struct dentry *origin, bool verify);
int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
+int ovl_maybe_lookup_lowerdata(struct dentry *dentry);
struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags);
bool ovl_lower_positive(struct dentry *dentry);
struct ovl_inode_params {
struct inode *newinode;
struct dentry *upperdentry;
- struct ovl_path *lowerpath;
+ struct ovl_entry *oe;
bool index;
- unsigned int numlower;
char *redirect;
- struct dentry *lowerdata;
+ char *lowerdata_redirect;
};
void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
unsigned long ino, int fsid);
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