X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/d57ee3ae693448387e3022fdd07bd741b2db818a..c50398ab4cb09658b3b3fff74804d2f26df785e7:/lunaix-os/includes/lunaix/fs.h

diff --git a/lunaix-os/includes/lunaix/fs.h b/lunaix-os/includes/lunaix/fs.h
index c86c6bc..2fee2f2 100644
--- a/lunaix-os/includes/lunaix/fs.h
+++ b/lunaix-os/includes/lunaix/fs.h
@@ -44,7 +44,7 @@
 #define VFS_VALID_CHAR(chr)                                                    \
     (('A' <= (chr) && (chr) <= 'Z') || ('a' <= (chr) && (chr) <= 'z') ||       \
      ('0' <= (chr) && (chr) <= '9') || (chr) == '.' || (chr) == '_' ||         \
-     (chr) == '-')
+     (chr) == '-' || (chr) == ':')
 
 #define unlock_inode(inode) mutex_unlock(&inode->lock)
 #define lock_inode(inode)                                                      \
@@ -120,7 +120,7 @@ struct v_file_ops
     int (*write)(struct v_inode* inode, void* buffer, size_t len, size_t fpos);
     int (*read)(struct v_inode* inode, void* buffer, size_t len, size_t fpos);
     int (*readdir)(struct v_file* file, struct dir_context* dctx);
-    int (*seek)(struct v_inode* inode, size_t offset);
+    int (*seek)(struct v_inode* inode, size_t offset); // optional
     int (*close)(struct v_file* file);
     int (*sync)(struct v_file* file);
 };
@@ -140,9 +140,12 @@ struct v_inode_ops
     int (*rename)(struct v_inode* from_inode,
                   struct v_dnode* from_dnode,
                   struct v_dnode* to_dnode);
-    int (*getxattr)(struct v_inode* this, struct v_xattr_entry* entry);
-    int (*setxattr)(struct v_inode* this, struct v_xattr_entry* entry);
-    int (*delxattr)(struct v_inode* this, struct v_xattr_entry* entry);
+    int (*getxattr)(struct v_inode* this,
+                    struct v_xattr_entry* entry); // optional
+    int (*setxattr)(struct v_inode* this,
+                    struct v_xattr_entry* entry); // optional
+    int (*delxattr)(struct v_inode* this,
+                    struct v_xattr_entry* entry); // optional
 };
 
 struct v_xattr_entry
@@ -169,6 +172,18 @@ struct v_fd
     int flags;
 };
 
+// FIXME how do we invalidate corresponding v_dnodes given the v_inode?
+/*
+    Consider taskfs, which is Lunaix's speak of Linux's procfs, that allow
+    info of every process being accessible via file system. Each process's
+    creation will result a creation of a directory under the root of task fs
+    with it's pid as name. But that dir must delete when process is killed, and
+    such deletion does not mediated by vfs itself, so there is a need of cache
+    syncing.
+    And this is also the case of all ramfs where argumentation to file tree is
+    performed by third party.
+*/
+
 struct v_inode
 {
     inode_t id;
@@ -202,6 +217,7 @@ struct v_mount
     struct v_dnode* mnt_point;
     struct v_superblock* super_block;
     uint32_t busy_counter;
+    int flags;
 };
 
 struct v_dnode
@@ -291,7 +307,10 @@ vfs_walk_proc(const char* path,
               int options);
 
 int
-vfs_mount(const char* target, const char* fs_name, struct device* device);
+vfs_mount(const char* target,
+          const char* fs_name,
+          struct device* device,
+          int options);
 
 int
 vfs_unmount(const char* target);
@@ -299,7 +318,8 @@ vfs_unmount(const char* target);
 int
 vfs_mount_at(const char* fs_name,
              struct device* device,
-             struct v_dnode* mnt_point);
+             struct v_dnode* mnt_point,
+             int options);
 
 int
 vfs_unmount_at(struct v_dnode* mnt_point);
@@ -349,6 +369,15 @@ vfs_dup_fd(struct v_fd* old, struct v_fd** new);
 int
 vfs_getfd(int fd, struct v_fd** fd_s);
 
+int
+vfs_get_dtype(int itype);
+
+void
+vfs_ref_dnode(struct v_dnode* dnode);
+
+void
+vfs_unref_dnode(struct v_dnode* dnode);
+
 void
 pcache_init(struct pcache* pcache);
 
@@ -361,7 +390,7 @@ pcache_new_page(struct pcache* pcache, uint32_t index);
 void
 pcache_set_dirty(struct pcache* pcache, struct pcache_pg* pg);
 
-struct pcache_pg*
+int
 pcache_get_page(struct pcache* pcache,
                 uint32_t index,
                 uint32_t* offset,
@@ -407,6 +436,9 @@ vfs_mount_root(const char* fs_name, struct device* device);
 struct v_mount*
 vfs_create_mount(struct v_mount* parent, struct v_dnode* mnt_point);
 
+int
+vfs_check_writable(struct v_dnode* dnode);
+
 int
 default_file_read(struct v_inode* inode, void* buffer, size_t len, size_t fpos);