2 files changed, 238 insertions, 0 deletions
diff --git a/src/fs/include/fs/fs.h b/src/fs/include/fs/fs.h
new file mode 100644
index 0000000..c66ce97
--- /dev/null
+++ b/src/fs/include/fs/fs.h
@@ -0,0 +1,159 @@
+/*
+ * wanix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef FS_H
+#define FS_H
+
+#include <fs/inode.h>
+#include <state.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+struct fs_mountpoint;
+struct fs_mp_prv;
+struct fs_fd_prv;
+
+struct fs_stat
+{
+    const char *path;
+    struct stat *sb;
+    uid_t uid;
+    gid_t gid;
+};
+
+struct fs_mkdir
+{
+    const char *path;
+    mode_t mode;
+    uid_t uid;
+    gid_t gid;
+};
+
+struct fs_mount
+{
+    const char *src, *tgt;
+    mode_t mode;
+    uid_t uid;
+    gid_t gid;
+};
+
+struct fs_umount
+{
+    const char *tgt;
+    mode_t mode;
+    uid_t uid;
+    gid_t gid;
+};
+
+struct fs_open
+{
+    const char *path;
+    struct fs_fd *fd;
+    int flags;
+    mode_t mode;
+    uid_t uid;
+    gid_t gid;
+};
+
+struct fs_close
+{
+    struct fs_fd *fd;
+};
+
+struct fs_read
+{
+    struct fs_fd *fd;
+    void *buf;
+    size_t n;
+};
+
+struct fs_write
+{
+    struct fs_fd *fd;
+    const void *buf;
+    size_t n;
+};
+
+struct fs_seek
+{
+    struct fs_fd *fd;
+    long offset;
+};
+
+struct fs_ret
+{
+    enum state (*f)(void *args);
+    void *args;
+};
+
+enum
+{
+    FS_DEV_REQUIRED = 1
+};
+
+struct fs
+{
+    const char *type;
+    int flags;
+    int (*mount)(const struct fs_mount *, struct fs_ret *);
+    int (*umount)(const struct fs_umount *, struct fs_ret *);
+    int (*stat)(const struct fs_stat *, const struct fs_mp *,
+        const union inode_result *, struct fs_ret *);
+    int (*mkdir)(const struct fs_mkdir *, const struct fs_mp *,
+        const union inode_result *, struct fs_ret *);
+    int (*open)(const struct fs_open *, const struct fs_mp *,
+        const union inode_result *, struct fs_ret *);
+    int (*close)(const struct fs_close *, struct fs_ret *);
+    int (*read)(const struct fs_read *, struct fs_ret *);
+    int (*write)(const struct fs_write *, struct fs_ret *);
+    int (*seek)(const struct fs_seek *, struct fs_ret *);
+    struct inode_ops iops;
+};
+
+struct fs_mp
+{
+    const char *src, *tgt;
+    const struct fs *fs;
+    struct fs_mp_prv *prv;
+};
+
+struct fs_fd
+{
+    long offset;
+    int error;
+    const struct fs_mp *mp;
+    union inode_result inode;
+    struct fs_fd_prv *prv;
+};
+
+typedef int (*fs_update_fn)(struct fs_mp_prv *);
+
+int fs_register(const struct fs *fs);
+int fs_update(void);
+int fs_mountpoint(const char *src, const char *tgt, const struct fs *fs,
+    fs_update_fn fn, struct fs_mp_prv *pr);
+const struct fs *fs_from_type(const char *type);
+int fs_mp_from_path(const char *path, struct fs_mp *mp);
+struct fs_mp *fs_mps_from_path(const char *path, size_t *n);
+const char *fs_relpath(const char *path);
+char *fs_parent(const char *path);
+int fs_next(const char *path, char **next, size_t *i);
+
+#endif
diff --git a/src/fs/include/fs/inode.h b/src/fs/include/fs/inode.h
new file mode 100644
index 0000000..914564b
--- /dev/null
+++ b/src/fs/include/fs/inode.h
@@ -0,0 +1,79 @@
+/*
+ * wanix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef FS_INODE_H
+#define FS_INODE_H
+
+#include <state.h>
+#include <sys/types.h>
+#include <time.h>
+
+struct fs;
+struct fs_mp;
+struct fs_ret;
+struct inode_prv;
+
+enum
+{
+    INODE_DIR = 1,
+    INODE_REGFILE = 1 << 1,
+    INODE_BLOCKDEV = 1 << 2,
+    INODE_MOUNTPOINT = 1 << 3,
+};
+
+struct inode
+{
+    char *name;
+    int flags;
+    ino_t ino;
+    mode_t mode;
+    uid_t uid;
+    gid_t gid;
+    struct timespec atim, mtim, ctim;
+    struct inode *parent, *child, *left, *right;
+    struct inode_prv *prv;
+};
+
+union inode_result
+{
+    struct inode cachei, *memi;
+};
+
+typedef int (*inode_search_done)(enum state state, const char *relpath,
+    const struct fs_mp *mp, const union inode_result *inode, void *args);
+
+struct inode_search
+{
+    const char *path;
+    inode_search_done done;
+    void *args;
+};
+
+struct inode_ops
+{
+    int (*search)(const char *path, const struct fs_mp *mp,
+        union inode_result *inode, struct fs_ret *r);
+    int (*reserve)(const struct inode *i, void *args, struct fs_ret *r);
+    int (*flags)(const union inode_result *i);
+};
+
+int inode_search(const struct inode_search *s, struct fs_ret *r);
+void inode_search_free(struct inode_search *s);
+void inode_free(struct inode *i);
+
+#endif