X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/a7384053efe345d199440720b437a28e91058ff3..cb089e17fcc6bd4823bd919cce2b9e62631cd570:/lunaix-os/includes/lunaix/fs.h

diff --git a/lunaix-os/includes/lunaix/fs.h b/lunaix-os/includes/lunaix/fs.h
index d43293b..4f57e08 100644
--- a/lunaix-os/includes/lunaix/fs.h
+++ b/lunaix-os/includes/lunaix/fs.h
@@ -9,6 +9,7 @@
 #include <lunaix/ds/llist.h>
 #include <lunaix/ds/lru.h>
 #include <lunaix/ds/mutex.h>
+#include <lunaix/process.h>
 #include <lunaix/status.h>
 #include <stdatomic.h>
 
@@ -31,6 +32,8 @@
 #define VFS_HASH_MASK (VFS_HASHTABLE_SIZE - 1)
 #define VFS_HASHBITS (32 - VFS_HASHTABLE_BITS)
 
+#define VFS_PATH_DELIM '/'
+
 #define FSTYPE_ROFS 0x1
 
 #define DO_STATUS(errno) SYSCALL_ESTATUS(__current->k_status = errno)
@@ -41,7 +44,21 @@
 #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)                                                      \
+    ({                                                                         \
+        mutex_lock(&inode->lock);                                              \
+        lru_use_one(inode_lru, &inode->lru);                                   \
+    })
+
+#define unlock_dnode(dnode) mutex_unlock(&dnode->lock)
+#define lock_dnode(dnode)                                                      \
+    ({                                                                         \
+        mutex_lock(&dnode->lock);                                              \
+        lru_use_one(dnode_lru, &dnode->lru);                                   \
+    })
 
 typedef uint32_t inode_t;
 
@@ -53,6 +70,7 @@ struct v_file_ops;
 struct v_inode_ops;
 struct v_fd;
 struct pcache;
+struct v_xattr_entry;
 
 extern struct v_file_ops default_file_ops;
 extern struct v_inode_ops default_inode_ops;
@@ -102,7 +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);
 };
@@ -122,6 +140,20 @@ 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); // 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
+{
+    struct llist_header entries;
+    struct hstr name;
+    const void* value;
+    size_t len;
 };
 
 struct v_file
@@ -140,6 +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;
@@ -153,11 +197,13 @@ struct v_inode
     uint32_t link_count;
     uint32_t lb_usage;
     uint32_t fsize;
+    void* data; // 允许底层FS绑定他的一些专有数据
+    struct llist_header aka_dnodes;
+    struct llist_header xattrs;
     struct v_superblock* sb;
     struct hlist_node hash_list;
     struct lru_node lru;
     struct pcache* pg_cache;
-    void* data; // 允许底层FS绑定他的一些专有数据
     struct v_inode_ops* ops;
     struct v_file_ops* default_fops;
 };
@@ -172,6 +218,7 @@ struct v_mount
     struct v_dnode* mnt_point;
     struct v_superblock* super_block;
     uint32_t busy_counter;
+    int flags;
 };
 
 struct v_dnode
@@ -182,6 +229,7 @@ struct v_dnode
     struct v_inode* inode;
     struct v_dnode* parent;
     struct hlist_node hash_list;
+    struct llist_header aka_list;
     struct llist_header children;
     struct llist_header siblings;
     struct v_superblock* super_block;
@@ -216,7 +264,7 @@ struct pcache_pg
     uint32_t flags;
     uint32_t fpos;
 };
-/* --- file system manager --- */
+
 void
 fsm_init();
 
@@ -235,12 +283,21 @@ fsm_get(const char* fs_name);
 void
 vfs_init();
 
+void
+vfs_export_attributes();
+
 struct v_dnode*
 vfs_dcache_lookup(struct v_dnode* parent, struct hstr* str);
 
 void
 vfs_dcache_add(struct v_dnode* parent, struct v_dnode* dnode);
 
+void
+vfs_dcache_rehash(struct v_dnode* new_parent, struct v_dnode* dnode);
+
+void
+vfs_dcache_remove(struct v_dnode* dnode);
+
 int
 vfs_walk(struct v_dnode* start,
          const char* path,
@@ -249,7 +306,16 @@ vfs_walk(struct v_dnode* start,
          int walk_options);
 
 int
-vfs_mount(const char* target, const char* fs_name, struct device* device);
+vfs_walk_proc(const char* path,
+              struct v_dnode** dentry,
+              struct hstr* component,
+              int options);
+
+int
+vfs_mount(const char* target,
+          const char* fs_name,
+          struct device* device,
+          int options);
 
 int
 vfs_unmount(const char* target);
@@ -257,7 +323,8 @@ 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);
@@ -268,9 +335,15 @@ vfs_mkdir(const char* path, struct v_dnode** dentry);
 int
 vfs_open(struct v_dnode* dnode, struct v_file** file);
 
+int
+vfs_pclose(struct v_file* file, pid_t pid);
+
 int
 vfs_close(struct v_file* file);
 
+void
+vfs_free_fd(struct v_fd* fd);
+
 int
 vfs_fsync(struct v_file* file);
 
@@ -304,6 +377,21 @@ vfs_i_free(struct v_inode* inode);
 int
 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);
+
+int
+vfs_get_path(struct v_dnode* dnode, char* buf, size_t size, int depth);
+
 void
 pcache_init(struct pcache* pcache);
 
@@ -316,7 +404,7 @@ 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,
@@ -362,6 +450,9 @@ 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);
 
@@ -397,4 +488,13 @@ default_inode_rmdir(struct v_inode* this, struct v_dnode* dir);
 int
 default_inode_mkdir(struct v_inode* this, struct v_dnode* dir);
 
+struct v_xattr_entry*
+xattr_new(struct hstr* name);
+
+struct v_xattr_entry*
+xattr_getcache(struct v_inode* inode, struct hstr* name);
+
+void
+xattr_addcache(struct v_inode* inode, struct v_xattr_entry* xattr);
+
 #endif /* __LUNAIX_VFS_H */