feat: basic elf32 loader (only LOAD segment is supported)

[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 539f0a8aa0d8ccd658e522751319606440f936b8..4b2888157d59003569801d30fbcf6d13c32565f6 100644 (file)
--- a/lunaix-os/includes/lunaix/fs.h
+++ b/lunaix-os/includes/lunaix/fs.h
@@ -9,7 +9,6 @@
 #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>
 
@@ -36,9 +35,6 @@
 
 #define FSTYPE_ROFS 0x1
 
-#define DO_STATUS(errno) SYSCALL_ESTATUS(__current->k_status = errno)
-#define DO_STATUS_OR_RETURN(errno) ({ errno < 0 ? DO_STATUS(errno) : errno; })
-
 #define TEST_FD(fd) (fd >= 0 && fd < VFS_MAX_FD)
 
 #define VFS_VALID_CHAR(chr)                                                    \
@@ -60,7 +56,7 @@
         lru_use_one(dnode_lru, &dnode->lru);                                   \
     })
 
-typedef uint32_t inode_t;
+typedef u32_t inode_t;
 
 struct v_dnode;
 struct v_inode;
@@ -83,7 +79,7 @@ struct filesystem
 {
     struct hlist_node fs_list;
     struct hstr fs_name;
-    uint32_t types;
+    u32_t types;
     int fs_id;
     int (*mount)(struct v_superblock* vsb, struct v_dnode* mount_point);
     int (*unmount)(struct v_superblock* vsb);
@@ -95,12 +91,12 @@ struct v_superblock
     struct device* dev;
     struct v_dnode* root;
     struct filesystem* fs;
-    uint32_t iobuf_size;
     struct hbucket* i_cache;
+    void* data;
     struct
     {
-        uint32_t (*read_capacity)(struct v_superblock* vsb);
-        uint32_t (*read_usage)(struct v_superblock* vsb);
+        u32_t (*read_capacity)(struct v_superblock* vsb);
+        u32_t (*read_usage)(struct v_superblock* vsb);
         void (*init_inode)(struct v_superblock* vsb, struct v_inode* inode);
     } ops;
 };
@@ -119,6 +115,16 @@ 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);
+
+    // for operatiosn {write|read}_page, following are true:
+    //  + `len` always equals to PG_SIZE
+    //  + `fpos` always PG_SIZE aligned.
+    // 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 (*readdir)(struct v_file* file, struct dir_context* dctx);
     int (*seek)(struct v_inode* inode, size_t offset); // optional
     int (*close)(struct v_file* file);
@@ -161,7 +167,7 @@ struct v_file
     struct v_inode* inode;
     struct v_dnode* dnode;
     struct llist_header* f_list;
-    uint32_t f_pos;
+    u32_t f_pos;
     atomic_ulong ref_count;
     struct v_file_ops* ops; // for caching
 };
@@ -172,7 +178,8 @@ struct v_fd
     int flags;
 };
 
-// FIXME how do we invalidate corresponding v_dnodes given the v_inode?
+//  [v_inode::aka_nodes]
+//  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
@@ -188,15 +195,15 @@ struct v_inode
 {
     inode_t id;
     mutex_t lock;
-    uint32_t itype;
+    u32_t itype;
     time_t ctime;
     time_t mtime;
     time_t atime;
     lba_t lb_addr;
-    uint32_t open_count;
-    uint32_t link_count;
-    uint32_t lb_usage;
-    uint32_t fsize;
+    u32_t open_count;
+    u32_t link_count;
+    u32_t lb_usage;
+    u32_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;
@@ -206,6 +213,8 @@ struct v_inode
     struct pcache* pg_cache;
     struct v_inode_ops* ops;
     struct v_file_ops* default_fops;
+
+    void (*destruct)(struct v_inode* inode);
 };
 
 struct v_mount
@@ -217,7 +226,7 @@ struct v_mount
     struct v_mount* parent;
     struct v_dnode* mnt_point;
     struct v_superblock* super_block;
-    uint32_t busy_counter;
+    u32_t busy_counter;
     int flags;
 };
 
@@ -250,8 +259,8 @@ struct pcache
     struct btrie tree;
     struct llist_header pages;
     struct llist_header dirty;
-    uint32_t n_dirty;
-    uint32_t n_pages;
+    u32_t n_dirty;
+    u32_t n_pages;
 };
 
 struct pcache_pg
@@ -261,8 +270,9 @@ struct pcache_pg
     struct lru_node lru;
     struct pcache* holder;
     void* pg;
-    uint32_t flags;
-    uint32_t fpos;
+    u32_t flags;
+    u32_t fpos;
+    u32_t len;
 };
 
 void
@@ -341,6 +351,9 @@ 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);
 
@@ -360,7 +373,7 @@ void
 vfs_d_free(struct v_dnode* dnode);
 
 struct v_inode*
-vfs_i_find(struct v_superblock* sb, uint32_t i_id);
+vfs_i_find(struct v_superblock* sb, u32_t i_id);
 
 void
 vfs_i_addhash(struct v_inode* inode);
@@ -383,6 +396,9 @@ vfs_get_dtype(int itype);
 void
 vfs_ref_dnode(struct v_dnode* dnode);
 
+void
+vfs_ref_file(struct v_file* file);
+
 void
 vfs_unref_dnode(struct v_dnode* dnode);
 
@@ -396,22 +412,22 @@ void
 pcache_release_page(struct pcache* pcache, struct pcache_pg* page);
 
 struct pcache_pg*
-pcache_new_page(struct pcache* pcache, uint32_t index);
+pcache_new_page(struct pcache* pcache, u32_t index);
 
 void
 pcache_set_dirty(struct pcache* pcache, struct pcache_pg* pg);
 
 int
 pcache_get_page(struct pcache* pcache,
-                uint32_t index,
-                uint32_t* offset,
+                u32_t index,
+                u32_t* offset,
                 struct pcache_pg** page);
 
 int
-pcache_write(struct v_inode* inode, void* data, uint32_t len, uint32_t fpos);
+pcache_write(struct v_inode* inode, void* data, u32_t len, u32_t fpos);
 
 int
-pcache_read(struct v_inode* inode, void* data, uint32_t len, uint32_t fpos);
+pcache_read(struct v_inode* inode, void* data, u32_t len, u32_t fpos);
 
 void
 pcache_release(struct pcache* pcache);