X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/21ffd87b228fa0bd0c25a09b710c6aeac8b81281..4b6190b935dd75d8ddd514a05c7c7343e32c0cdc:/lunaix-os/includes/lunaix/fs.h diff --git a/lunaix-os/includes/lunaix/fs.h b/lunaix-os/includes/lunaix/fs.h index e95fbad..d106178 100644 --- a/lunaix-os/includes/lunaix/fs.h +++ b/lunaix-os/includes/lunaix/fs.h @@ -9,6 +9,7 @@ #include #include #include +#include #include #include @@ -24,22 +25,40 @@ #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; @@ -47,15 +66,25 @@ struct v_dnode; 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); }; @@ -72,6 +101,7 @@ struct v_superblock { 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; }; @@ -89,10 +119,41 @@ 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_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 @@ -102,7 +163,7 @@ 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 @@ -111,6 +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; @@ -124,27 +197,14 @@ struct v_inode 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 @@ -157,6 +217,7 @@ struct v_mount struct v_dnode* mnt_point; struct v_superblock* super_block; uint32_t busy_counter; + int flags; }; struct v_dnode @@ -205,6 +266,12 @@ struct pcache_pg void fsm_init(); +void +fsm_register_all(); + +struct filesystem* +fsm_new_fs(char* name, size_t name_len); + void fsm_register(struct filesystem* fs); @@ -214,12 +281,21 @@ 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, @@ -228,7 +304,16 @@ 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); @@ -236,7 +321,8 @@ 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); @@ -247,6 +333,9 @@ 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); @@ -269,10 +358,13 @@ void 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); @@ -280,6 +372,21 @@ 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); @@ -292,7 +399,7 @@ 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, @@ -332,6 +439,57 @@ mnt_mkbusy(struct v_mount* mnt); 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 */