#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>
#define VFS_WALK_MKPARENT 0x1
#define VFS_WALK_FSRELATIVE 0x2
#define VFS_WALK_PARENT 0x4
-#define VFS_WALK_NOFOLLOW 0x4
+#define VFS_WALK_NOFOLLOW 0x8
#define VFS_HASHTABLE_BITS 10
#define VFS_HASHTABLE_SIZE (1 << VFS_HASHTABLE_BITS)
#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)
+#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) \
(('A' <= (chr) && (chr) <= 'Z') || ('a' <= (chr) && (chr) <= 'z') || \
('0' <= (chr) && (chr) <= '9') || (chr) == '.' || (chr) == '_' || \
- (chr) == '-')
-
-extern struct hstr vfs_ddot;
-extern struct hstr vfs_dot;
+ (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;
struct v_inode;
struct v_superblock;
struct v_file;
+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;
+
+extern struct hstr vfs_ddot;
+extern struct hstr vfs_dot;
+extern struct v_dnode* vfs_sysroot;
struct filesystem
{
struct hlist_node fs_list;
struct hstr fs_name;
uint32_t types;
- int fs_id; // can be used to detect fs type on partition
+ int fs_id;
int (*mount)(struct v_superblock* vsb, struct v_dnode* mount_point);
int (*unmount)(struct v_superblock* vsb);
};
{
uint32_t (*read_capacity)(struct v_superblock* vsb);
uint32_t (*read_usage)(struct v_superblock* vsb);
+ void (*init_inode)(struct v_superblock* vsb, struct v_inode* inode);
} 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_inode* inode, struct dir_context* dctx);
- int (*seek)(struct v_inode* inode, size_t offset);
+ 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);
- int (*sync)(struct v_inode* inode);
+ int (*sync)(struct v_file* file);
+};
+
+struct v_inode_ops
+{
+ int (*create)(struct v_inode* this, struct v_dnode* dnode);
+ int (*open)(struct v_inode* this, struct v_file* file);
+ int (*sync)(struct v_inode* this);
+ int (*mkdir)(struct v_inode* this, struct v_dnode* dnode);
+ int (*rmdir)(struct v_inode* this, struct v_dnode* dir);
+ int (*unlink)(struct v_inode* this);
+ int (*link)(struct v_inode* this, struct v_dnode* new_name);
+ int (*read_symlink)(struct v_inode* this, const char** path_out);
+ int (*set_symlink)(struct v_inode* this, const char* target);
+ int (*dir_lookup)(struct v_inode* this, struct v_dnode* dnode);
+ 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
struct llist_header* f_list;
uint32_t f_pos;
atomic_ulong ref_count;
- struct v_file_ops ops;
+ struct v_file_ops* ops; // for caching
};
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;
uint32_t link_count;
uint32_t lb_usage;
uint32_t fsize;
+ 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
- {
- int (*create)(struct v_inode* this, struct v_dnode* dnode);
- int (*open)(struct v_inode* this, struct v_file* file);
- int (*sync)(struct v_inode* this);
- int (*mkdir)(struct v_inode* this, struct v_dnode* dnode);
- int (*rmdir)(struct v_inode* this, struct v_dnode* dir);
- int (*unlink)(struct v_inode* this);
- int (*link)(struct v_inode* this, struct v_dnode* new_name);
- int (*read_symlink)(struct v_inode* this, const char** path_out);
- int (*set_symlink)(struct v_inode* this, const char* target);
- int (*dir_lookup)(struct v_inode* this, struct v_dnode* dnode);
- int (*rename)(struct v_inode* from_inode,
- struct v_dnode* from_dnode,
- struct v_dnode* to_dnode);
- } ops;
- struct v_file_ops default_fops;
+ struct v_inode_ops* ops;
+ struct v_file_ops* default_fops;
};
struct v_mount
struct v_dnode* mnt_point;
struct v_superblock* super_block;
uint32_t busy_counter;
+ int flags;
};
struct v_dnode
void
fsm_init();
+void
+fsm_register_all();
+
+struct filesystem*
+fsm_new_fs(char* name, size_t name_len);
+
void
fsm_register(struct filesystem* fs);
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,
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);
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);
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);
vfs_d_free(struct v_dnode* dnode);
struct v_inode*
-vfs_i_alloc(struct v_superblock* sb,
- uint32_t inode_id,
- void (*init)(struct v_inode* inode, void* data),
- void* data);
+vfs_i_find(struct v_superblock* sb, uint32_t i_id);
+
+void
+vfs_i_addhash(struct v_inode* inode);
+
+struct v_inode*
+vfs_i_alloc(struct v_superblock* sb);
void
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);
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,
void
mnt_chillax(struct v_mount* mnt);
+int
+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);
+
+int
+default_file_write(struct v_inode* inode,
+ void* buffer,
+ size_t len,
+ size_t fpos);
+
+int
+default_file_readdir(struct v_file* file, struct dir_context* dctx);
+
+int
+default_inode_dirlookup(struct v_inode* this, struct v_dnode* dnode);
+
+int
+default_inode_rename(struct v_inode* from_inode,
+ struct v_dnode* from_dnode,
+ struct v_dnode* to_dnode);
+
+int
+default_file_close(struct v_file* file);
+
+int
+default_file_seek(struct v_inode* inode, size_t offset);
+
+int
+default_inode_open(struct v_inode* this, struct v_file* file);
+
+int
+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 */
git://scm.lunaixsky.com / lunaix-os.git / blobdiff