/* * Copyright 2002-2006, Axel Dörfler, axeld@pinc-software.de. All rights reserved. * Distributed under the terms of the MIT License. * * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved. * Distributed under the terms of the NewOS License. */ #ifndef _KERNEL_VFS_H #define _KERNEL_VFS_H #include #include #include #include #include #include #include #include #define DEFAULT_FD_TABLE_SIZE 128 #define MAX_FD_TABLE_SIZE 2048 #define MAX_NODE_MONITORS 4096 struct kernel_args; struct vm_cache_ref; struct file_descriptor; struct selectsync; struct pollfd; /** The I/O context of a process/team, holds the fd array among others */ typedef struct io_context { struct vnode *cwd; mutex io_mutex; uint32 table_size; uint32 num_used_fds; struct file_descriptor **fds; uint8 *fds_close_on_exec; struct list node_monitors; uint32 num_monitors; uint32 max_monitors; } io_context; struct fd_info { int number; int32 open_mode; dev_t device; ino_t node; }; /* macro to allocate a iovec array on the stack */ #define IOVECS(name, size) \ uint8 _##name[sizeof(iovecs) + (size)*sizeof(iovec)]; \ iovecs *name = (iovecs *)_##name #ifdef __cplusplus extern "C" { #endif status_t vfs_init(struct kernel_args *args); status_t vfs_bootstrap_file_systems(void); status_t vfs_mount_boot_file_system(struct kernel_args *args); void vfs_exec_io_context(void *context); void *vfs_new_io_context(void *parentContext); status_t vfs_free_io_context(void *context); struct rlimit; int vfs_getrlimit(int resource, struct rlimit * rlp); int vfs_setrlimit(int resource, const struct rlimit * rlp); /* calls needed by the VM for paging and by the file cache */ int vfs_get_vnode_from_fd(int fd, bool kernel, void **vnode); status_t vfs_get_vnode_from_path(const char *path, bool kernel, void **vnode); status_t vfs_get_vnode(mount_id mountID, vnode_id vnodeID, void **_vnode); status_t vfs_entry_ref_to_vnode(mount_id mountID, vnode_id directoryID, const char *name, void **_vnode); void vfs_vnode_to_node_ref(void *_vnode, mount_id *_mountID, vnode_id *_vnodeID); status_t vfs_lookup_vnode(mount_id mountID, vnode_id vnodeID, void **_vnode); void vfs_put_vnode(void *vnode); void vfs_acquire_vnode(void *vnode); status_t vfs_get_cookie_from_fd(int fd, void **_cookie); bool vfs_can_page(void *vnode, void *cookie); status_t vfs_read_pages(void *vnode, void *cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes); status_t vfs_write_pages(void *vnode, void *cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes); status_t vfs_get_vnode_cache(void *vnode, struct vm_cache_ref **_cache, bool allocate); status_t vfs_get_file_map( void *_vnode, off_t offset, size_t size, struct file_io_vec *vecs, size_t *_count); status_t vfs_get_fs_node_from_path(mount_id mountID, const char *path, bool kernel, void **_node); status_t vfs_stat_vnode(void *_vnode, struct stat *stat); status_t vfs_get_vnode_name(void *vnode, char *name, size_t nameSize); status_t vfs_get_cwd(mount_id *_mountID, vnode_id *_vnodeID); status_t vfs_disconnect_vnode(mount_id mountID, vnode_id vnodeID); void vfs_free_unused_vnodes(int32 level); /* special module convenience call */ status_t vfs_get_module_path(const char *basePath, const char *moduleName, char *pathBuffer, size_t bufferSize); /* service call for whoever needs a normalized path */ status_t vfs_normalize_path(const char *path, char *buffer, size_t bufferSize, bool kernel); /* service call for the node monitor */ status_t resolve_mount_point_to_volume_root(mount_id mountID, vnode_id nodeID, mount_id *resolvedMountID, vnode_id *resolvedNodeID); /* calls the syscall dispatcher should use for user file I/O */ dev_t _user_mount(const char *path, const char *device, const char *fs_name, uint32 flags, const char *args, size_t argsLength); status_t _user_unmount(const char *path, uint32 flags); status_t _user_read_fs_info(dev_t device, struct fs_info *info); status_t _user_write_fs_info(dev_t device, const struct fs_info *info, int mask); dev_t _user_next_device(int32 *_cookie); status_t _user_sync(void); status_t _user_get_next_fd_info(team_id team, uint32 *cookie, struct fd_info *info, size_t infoSize); status_t _user_entry_ref_to_path(dev_t device, ino_t inode, const char *leaf, char *userPath, size_t pathLength); int _user_open_entry_ref(dev_t device, ino_t inode, const char *name, int openMode, int perms); int _user_open(int fd, const char *path, int openMode, int perms); int _user_open_dir_node_ref(dev_t device, ino_t inode); int _user_open_dir_entry_ref(dev_t device, ino_t inode, const char *uname); int _user_open_dir(int fd, const char *path); int _user_open_parent_dir(int fd, char *name, size_t nameLength); status_t _user_fcntl(int fd, int op, uint32 argument); status_t _user_fsync(int fd); status_t _user_read_stat(int fd, const char *path, bool traverseLink, struct stat *stat, size_t statSize); status_t _user_write_stat(int fd, const char *path, bool traverseLink, const struct stat *stat, size_t statSize, int statMask); off_t _user_seek(int fd, off_t pos, int seekType); status_t _user_create_dir_entry_ref(dev_t device, ino_t inode, const char *name, int perms); status_t _user_create_dir(int fd, const char *path, int perms); status_t _user_remove_dir(int fd, const char *path); status_t _user_read_link(int fd, const char *path, char *buffer, size_t *_bufferSize); status_t _user_write_link(const char *path, const char *toPath); status_t _user_create_symlink(int fd, const char *path, const char *toPath, int mode); status_t _user_create_link(const char *path, const char *toPath); status_t _user_unlink(int fd, const char *path); status_t _user_rename(int oldFD, const char *oldpath, int newFD, const char *newpath); status_t _user_access(const char *path, int mode); ssize_t _user_select(int numfds, fd_set *readSet, fd_set *writeSet, fd_set *errorSet, bigtime_t timeout, const sigset_t *sigMask); ssize_t _user_poll(struct pollfd *fds, int numfds, bigtime_t timeout); int _user_open_attr_dir(int fd, const char *path); int _user_create_attr(int fd, const char *name, uint32 type, int openMode); int _user_open_attr(int fd, const char *name, int openMode); status_t _user_remove_attr(int fd, const char *name); status_t _user_rename_attr(int fromFile, const char *fromName, int toFile, const char *toName); int _user_open_index_dir(dev_t device); status_t _user_create_index(dev_t device, const char *name, uint32 type, uint32 flags); status_t _user_read_index_stat(dev_t device, const char *name, struct stat *stat); status_t _user_remove_index(dev_t device, const char *name); status_t _user_getcwd(char *buffer, size_t size); status_t _user_setcwd(int fd, const char *path); int _user_open_query(dev_t device, const char *query, size_t queryLength, uint32 flags, port_id port, int32 token); /* fd user prototypes (implementation located in fd.c) */ extern ssize_t _user_read(int fd, off_t pos, void *buffer, size_t bufferSize); extern ssize_t _user_readv(int fd, off_t pos, const iovec *vecs, size_t count); extern ssize_t _user_write(int fd, off_t pos, const void *buffer, size_t bufferSize); extern ssize_t _user_writev(int fd, off_t pos, const iovec *vecs, size_t count); extern status_t _user_ioctl(int fd, ulong cmd, void *data, size_t length); extern ssize_t _user_read_dir(int fd, struct dirent *buffer, size_t bufferSize, uint32 maxCount); extern status_t _user_rewind_dir(int fd); extern status_t _user_close(int fd); extern int _user_dup(int fd); extern int _user_dup2(int ofd, int nfd); extern status_t _user_lock_node(int fd); extern status_t _user_unlock_node(int fd); /* vfs entry points... */ #ifdef __cplusplus } #endif #endif /* _KERNEL_VFS_H */