X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/af8e873ae38b72a56a89485c62bb5ccd22a9f8a7..cb089e17fcc6bd4823bd919cce2b9e62631cd570:/lunaix-os/includes/lunaix/fs.h?ds=sidebyside diff --git a/lunaix-os/includes/lunaix/fs.h b/lunaix-os/includes/lunaix/fs.h index d0d59d1..4f57e08 100644 --- a/lunaix-os/includes/lunaix/fs.h +++ b/lunaix-os/includes/lunaix/fs.h @@ -1,15 +1,17 @@ #ifndef __LUNAIX_VFS_H #define __LUNAIX_VFS_H -#include -#include #include +#include #include #include #include #include #include +#include +#include #include +#include #define VFS_NAME_MAXLEN 128 #define VFS_MAX_FD 32 @@ -23,30 +25,66 @@ #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) == '-') + (chr) == '-' || (chr) == ':') -extern struct hstr vfs_ddot; -extern struct hstr vfs_dot; +#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_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; int (*mount)(struct v_superblock* vsb, struct v_dnode* mount_point); int (*unmount)(struct v_superblock* vsb); }; @@ -54,15 +92,16 @@ struct filesystem struct v_superblock { struct llist_header sb_list; - int fs_id; - bdev_t dev; + struct device* dev; struct v_dnode* root; struct filesystem* fs; uint32_t iobuf_size; + struct hbucket* i_cache; struct { 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; }; @@ -80,11 +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 (*rename)(struct v_inode* inode, char* new_name); + 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 @@ -93,8 +162,8 @@ struct v_file struct v_dnode* dnode; struct llist_header* f_list; uint32_t f_pos; - uint32_t ref_count; - struct v_file_ops ops; + atomic_ulong ref_count; + struct v_file_ops* ops; // for caching }; struct v_fd @@ -103,8 +172,22 @@ 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; + mutex_t lock; uint32_t itype; time_t ctime; time_t mtime; @@ -114,38 +197,46 @@ struct v_inode uint32_t link_count; uint32_t lb_usage; uint32_t fsize; - 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); - 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); - 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 (*symlink)(struct v_inode* this, const char* target); - int (*dir_lookup)(struct v_inode* this, struct v_dnode* dnode); - } ops; - struct v_file_ops default_fops; + 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; + struct v_inode_ops* ops; + struct v_file_ops* default_fops; +}; + +struct v_mount +{ + mutex_t lock; + struct llist_header list; + struct llist_header submnts; + struct llist_header sibmnts; + struct v_mount* parent; + struct v_dnode* mnt_point; + struct v_superblock* super_block; + uint32_t busy_counter; + int flags; }; struct v_dnode { + mutex_t lock; // sync the path walking + struct lru_node lru; struct hstr name; 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; - uint32_t ref_count; - struct - { - void (*destruct)(struct v_dnode* dnode); - } ops; + struct v_mount* mnt; + atomic_ulong ref_count; + + void* data; }; struct v_fdtable @@ -153,16 +244,6 @@ struct v_fdtable struct v_fd* fds[VFS_MAX_FD]; }; -struct pcache_pg -{ - struct llist_header pg_list; - struct llist_header dirty_list; - struct lru_node lru; - void* pg; - uint32_t flags; - uint32_t fpos; -}; - struct pcache { struct v_inode* master; @@ -173,10 +254,26 @@ struct pcache uint32_t n_pages; }; -/* --- file system manager --- */ +struct pcache_pg +{ + struct llist_header pg_list; + struct llist_header dirty_list; + struct lru_node lru; + struct pcache* holder; + void* pg; + uint32_t flags; + uint32_t fpos; +}; + void fsm_init(); +void +fsm_register_all(); + +struct filesystem* +fsm_new_fs(char* name, size_t name_len); + void fsm_register(struct filesystem* fs); @@ -186,12 +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, @@ -200,13 +306,25 @@ vfs_walk(struct v_dnode* start, int walk_options); int -vfs_mount(const char* target, const char* fs_name, bdev_t 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, bdev_t device, struct v_dnode* mnt_point); +vfs_mount_at(const char* fs_name, + struct device* device, + struct v_dnode* mnt_point, + int options); int vfs_unmount_at(struct v_dnode* mnt_point); @@ -217,12 +335,21 @@ 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); +void +vfs_assign_inode(struct v_dnode* assign_to, struct v_inode* inode); + struct v_superblock* vfs_sb_alloc(); @@ -236,7 +363,13 @@ void vfs_d_free(struct v_dnode* dnode); struct v_inode* -vfs_i_alloc(); +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); @@ -244,6 +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); @@ -256,7 +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, @@ -279,4 +427,74 @@ pcache_commit_all(struct v_inode* inode); void pcache_invalidate(struct pcache* pcache, struct pcache_pg* page); + +/** + * @brief 将挂载点标记为繁忙 + * + * @param mnt + */ +void +mnt_mkbusy(struct v_mount* mnt); + +/** + * @brief 将挂载点标记为清闲 + * + * @param 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 */