Decoupling Architectural-specific Code (#35)

[lunaix-os.git] / lunaix-os / includes / lunaix / fs.h

diff --git a/lunaix-os/includes/lunaix/fs.h b/lunaix-os/includes/lunaix/fs.h
index 4b2888157d59003569801d30fbcf6d13c32565f6..0240c96a4ddc8348597b3096734f18477c95f7ad 100644 (file)
--- a/lunaix-os/includes/lunaix/fs.h
+++ b/lunaix-os/includes/lunaix/fs.h
@@ -6,24 +6,42 @@
 #include <lunaix/ds/btrie.h>
 #include <lunaix/ds/hashtable.h>
 #include <lunaix/ds/hstr.h>
+#include <lunaix/ds/ldga.h>
 #include <lunaix/ds/llist.h>
 #include <lunaix/ds/lru.h>
 #include <lunaix/ds/mutex.h>
 #include <lunaix/status.h>
+
 #include <stdatomic.h>
 
+#include <usr/lunaix/fstypes.h>
+
 #define VFS_NAME_MAXLEN 128
 #define VFS_MAX_FD 32
 
-#define VFS_IFDIR 0x1
-#define VFS_IFFILE 0x2
-#define VFS_IFSEQDEV 0x4
-#define VFS_IFVOLDEV 0x8
-#define VFS_IFSYMLINK 0x16
+#define VFS_IFDIR F_DIR
+#define VFS_IFFILE F_FILE
+#define VFS_IFDEV (F_DEV | F_FILE)
+#define VFS_IFSEQDEV (F_SEQDEV | F_FILE)
+#define VFS_IFVOLDEV (F_VOLDEV | F_FILE)
+#define VFS_IFSYMLINK (F_SYMLINK | F_FILE)
 
+#define VFS_DEVFILE(type) ((type) & F_DEV)
+#define VFS_DEVTYPE(type) ((type) & ((F_SEQDEV | F_VOLDEV) ^ F_DEV))
+
+// Walk, mkdir if component encountered is non-exists.
 #define VFS_WALK_MKPARENT 0x1
+
+// Walk, relative to current FS.
 #define VFS_WALK_FSRELATIVE 0x2
+
+/*
+    Terminate the walk on the immediate parent,
+    name of child (last component) is returned through `component`
+*/
 #define VFS_WALK_PARENT 0x4
+
+// Do not follow the symbolic link
 #define VFS_WALK_NOFOLLOW 0x8
 
 #define VFS_HASHTABLE_BITS 10
@@ -37,6 +55,9 @@
 
 #define TEST_FD(fd) (fd >= 0 && fd < VFS_MAX_FD)
 
+#define EXPORT_FILE_SYSTEM(fs_id, init_fn)                                     \
+    export_ldga_el(fs, fs_id, ptr_t, init_fn)
+
 #define VFS_VALID_CHAR(chr)                                                    \
     (('A' <= (chr) && (chr) <= 'Z') || ('a' <= (chr) && (chr) <= 'z') ||       \
      ('0' <= (chr) && (chr) <= '9') || (chr) == '.' || (chr) == '_' ||         \
@@ -77,6 +98,7 @@ extern struct v_dnode* vfs_sysroot;
 
 struct filesystem
 {
+    struct llist_header fs_flat;
     struct hlist_node fs_list;
     struct hstr fs_name;
     u32_t types;
@@ -93,6 +115,7 @@ struct v_superblock
     struct filesystem* fs;
     struct hbucket* i_cache;
     void* data;
+    size_t blksize;
     struct
     {
         u32_t (*read_capacity)(struct v_superblock* vsb);
@@ -122,8 +145,8 @@ struct v_file_ops
     // These additional operations allow underlying fs to use more specialized
     // and optimized code.
 
-    int (*write_page)(struct v_inode* inode, void* pg, size_t len, size_t fpos);
-    int (*read_page)(struct v_inode* inode, void* pg, size_t len, size_t fpos);
+    int (*write_page)(struct v_inode* inode, void* pg, size_t fpos);
+    int (*read_page)(struct v_inode* inode, void* pg, size_t fpos);
 
     int (*readdir)(struct v_file* file, struct dir_context* dctx);
     int (*seek)(struct v_inode* inode, size_t offset); // optional
@@ -275,6 +298,12 @@ struct pcache_pg
     u32_t len;
 };
 
+static inline bool
+check_itype_any(struct v_inode* inode, unsigned int type_mask)
+{
+    return !!(inode->itype & type_mask) || !type_mask;
+}
+
 void
 fsm_init();
 
@@ -475,6 +504,12 @@ default_file_write(struct v_inode* inode,
                    size_t len,
                    size_t fpos);
 
+int
+default_file_read_page(struct v_inode* inode, void* buffer, size_t fpos);
+
+int
+default_file_write_page(struct v_inode* inode, void* buffer, size_t fpos);
+
 int
 default_file_readdir(struct v_file* file, struct dir_context* dctx);