/* File System Interface Layer Definition
 *
 * Copyright 2004-2006, Haiku Inc. All Rights Reserved.
 * Distributed under the terms of the MIT License.
 */
#ifndef _FS_INTERFACE_H
#define _FS_INTERFACE_H


#include <OS.h>
#include <Select.h>
#include <module.h>
#include <disk_device_manager.h>

#include <sys/uio.h>


struct dirent;
struct stat;
struct fs_info;
struct select_sync;

typedef dev_t mount_id;
typedef ino_t vnode_id;

/* the file system's private data structures */
typedef void *fs_volume;
typedef void *fs_cookie;
typedef void *fs_vnode;

/* passed to write_stat() */
enum write_stat_mask {
	FS_WRITE_STAT_MODE		= 0x0001,
	FS_WRITE_STAT_UID		= 0x0002,
	FS_WRITE_STAT_GID		= 0x0004,
	FS_WRITE_STAT_SIZE		= 0x0008,
	FS_WRITE_STAT_ATIME		= 0x0010,
	FS_WRITE_STAT_MTIME		= 0x0020,
	FS_WRITE_STAT_CRTIME	= 0x0040
	// NOTE: Changing these constants will break
	// src/kits/storage/LibBeAdapter.cpp:_kern_write_stat().
};

/* passed to write_fs_info() */
#define	FS_WRITE_FSINFO_NAME	0x0001

struct file_io_vec {
	off_t	offset;
	off_t	length;
};

#define	B_CURRENT_FS_API_VERSION "/v1"

#ifdef __cplusplus
extern "C" {
#endif 

typedef struct file_system_module_info {
	struct module_info	info;
	const char			*pretty_name;

	/* scanning (the device is write locked) */
	float (*identify_partition)(int fd, partition_data *partition,
				void **cookie);
	status_t (*scan_partition)(int fd, partition_data *partition,
				void *cookie);
	void (*free_identify_partition_cookie)(partition_data *partition,
				void *cookie);
	void (*free_partition_content_cookie)(partition_data *partition);

	/* general operations */
	status_t (*mount)(mount_id id, const char *device, uint32 flags, 
				const char *args, fs_volume *_fs, vnode_id *_rootVnodeID);
	status_t (*unmount)(fs_volume fs);

	status_t (*read_fs_info)(fs_volume fs, struct fs_info *info);
	status_t (*write_fs_info)(fs_volume fs, const struct fs_info *info,
				uint32 mask);
	status_t (*sync)(fs_volume fs);

	/* vnode operations */
	status_t (*lookup)(fs_volume fs, fs_vnode dir, const char *name,
				vnode_id *_id, int *_type);
	status_t (*get_vnode_name)(fs_volume fs, fs_vnode vnode, char *buffer,
				size_t bufferSize);

	status_t (*get_vnode)(fs_volume fs, vnode_id id, fs_vnode *_vnode,
				bool reenter);
	status_t (*put_vnode)(fs_volume fs, fs_vnode vnode, bool reenter);
	status_t (*remove_vnode)(fs_volume fs, fs_vnode vnode, bool reenter);

	/* VM file access */
	bool (*can_page)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
	status_t (*read_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
				off_t pos, const iovec *vecs, size_t count, size_t *_numBytes,
				bool reenter);
	status_t (*write_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
				off_t pos, const iovec *vecs, size_t count, size_t *_numBytes,
				bool reenter);

	/* cache file access */
	status_t (*get_file_map)(fs_volume fs, fs_vnode vnode, off_t offset,
				size_t size, struct file_io_vec *vecs, size_t *_count);

	/* common operations */
	status_t (*ioctl)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, ulong op,
				void *buffer, size_t length);
	status_t (*set_flags)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
				int flags);
	status_t (*select)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
				uint8 event, uint32 ref, selectsync *sync);
	status_t (*deselect)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
				uint8 event, selectsync *sync);
	status_t (*fsync)(fs_volume fs, fs_vnode vnode);

	status_t (*read_link)(fs_volume fs, fs_vnode link, char *buffer,
				size_t *_bufferSize);
	status_t (*write_link)(fs_volume fs, fs_vnode link, char *toPath);
	status_t (*create_symlink)(fs_volume fs, fs_vnode dir, const char *name,
				const char *path, int mode);

	status_t (*link)(fs_volume fs, fs_vnode dir, const char *name,
				fs_vnode vnode);
	status_t (*unlink)(fs_volume fs, fs_vnode dir, const char *name);
	status_t (*rename)(fs_volume fs, fs_vnode fromDir, const char *fromName,
				fs_vnode toDir, const char *toName);

	status_t (*access)(fs_volume fs, fs_vnode vnode, int mode);
	status_t (*read_stat)(fs_volume fs, fs_vnode vnode, struct stat *stat);
	status_t (*write_stat)(fs_volume fs, fs_vnode vnode,
				const struct stat *stat, uint32 statMask);

	/* file operations */
	status_t (*create)(fs_volume fs, fs_vnode dir, const char *name,
				int openMode, int perms, fs_cookie *_cookie,
				vnode_id *_newVnodeID);
	status_t (*open)(fs_volume fs, fs_vnode vnode, int openMode,
				fs_cookie *_cookie);
	status_t (*close)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
	status_t (*free_cookie)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
	status_t (*read)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos,
				void *buffer, size_t *length);
	status_t (*write)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos,
				const void *buffer, size_t *length);

	/* directory operations */
	status_t (*create_dir)(fs_volume fs, fs_vnode parent, const char *name,
				int perms, vnode_id *_newVnodeID);
	status_t (*remove_dir)(fs_volume fs, fs_vnode parent, const char *name);
	status_t (*open_dir)(fs_volume fs, fs_vnode vnode, fs_cookie *_cookie);
	status_t (*close_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
	status_t (*free_dir_cookie)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
	status_t (*read_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
				struct dirent *buffer, size_t bufferSize, uint32 *_num);
	status_t (*rewind_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);

	/* attribute directory operations */
	status_t (*open_attr_dir)(fs_volume fs, fs_vnode vnode, fs_cookie *_cookie);
	status_t (*close_attr_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
	status_t (*free_attr_dir_cookie)(fs_volume fs, fs_vnode vnode,
				fs_cookie cookie);
	status_t (*read_attr_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
				struct dirent *buffer, size_t bufferSize, uint32 *_num);
	status_t (*rewind_attr_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);

	/* attribute operations */
	status_t (*create_attr)(fs_volume fs, fs_vnode vnode, const char *name,
				uint32 type, int openMode, fs_cookie *_cookie);
	status_t (*open_attr)(fs_volume fs, fs_vnode vnode, const char *name,
				int openMode, fs_cookie *_cookie);
	status_t (*close_attr)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
	status_t (*free_attr_cookie)(fs_volume fs, fs_vnode vnode,
				fs_cookie cookie);
	status_t (*read_attr)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
				off_t pos, void *buffer, size_t *length);
	status_t (*write_attr)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
				off_t pos, const void *buffer, size_t *length);

	status_t (*read_attr_stat)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
				struct stat *stat);
	status_t (*write_attr_stat)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
				const struct stat *stat, int statMask);
	status_t (*rename_attr)(fs_volume fs, fs_vnode fromVnode,
				const char *fromName, fs_vnode toVnode, const char *toName);
	status_t (*remove_attr)(fs_volume fs, fs_vnode vnode, const char *name);

	/* index directory & index operations */
	status_t (*open_index_dir)(fs_volume fs, fs_cookie *cookie);
	status_t (*close_index_dir)(fs_volume fs, fs_cookie cookie);
	status_t (*free_index_dir_cookie)(fs_volume fs, fs_cookie cookie);
	status_t (*read_index_dir)(fs_volume fs, fs_cookie cookie,
				struct dirent *buffer, size_t bufferSize, uint32 *_num);
	status_t (*rewind_index_dir)(fs_volume fs, fs_cookie cookie);

	status_t (*create_index)(fs_volume fs, const char *name, uint32 type,
				uint32 flags);
	status_t (*remove_index)(fs_volume fs, const char *name);
	status_t (*read_index_stat)(fs_volume fs, const char *name,
				struct stat *stat);

	/* query operations */
	status_t (*open_query)(fs_volume fs, const char *query, uint32 flags,
				port_id port, uint32 token, fs_cookie *_cookie);
	status_t (*close_query)(fs_volume fs, fs_cookie cookie);
	status_t (*free_query_cookie)(fs_volume fs, fs_cookie cookie);
	status_t (*read_query)(fs_volume fs, fs_cookie cookie, 
				struct dirent *buffer, size_t bufferSize, uint32 *_num);
	status_t (*rewind_query)(fs_volume fs, fs_cookie cookie);

	/* capability querying (the device is read locked) */
	// ToDo: this will probably be combined to a single call
	bool (*supports_defragmenting)(partition_data *partition,
				bool *whileMounted);
	bool (*supports_repairing)(partition_data *partition,
				bool checkOnly, bool *whileMounted);
	bool (*supports_resizing)(partition_data *partition,
				bool *whileMounted);
	bool (*supports_moving)(partition_data *partition, bool *isNoOp);
	bool (*supports_setting_content_name)(partition_data *partition,
				bool *whileMounted);
	bool (*supports_setting_content_parameters)(partition_data *partition, 
				bool *whileMounted);
	bool (*supports_initializing)(partition_data *partition);

	bool (*validate_resize)(partition_data *partition, off_t *size);
	bool (*validate_move)(partition_data *partition, off_t *start);
	bool (*validate_set_content_name)(partition_data *partition,
				char *name);
	bool (*validate_set_content_parameters)(partition_data *partition,
				const char *parameters);
	bool (*validate_initialize)(partition_data *partition, char *name,
				const char *parameters);

	/* shadow partition modification (device is write locked) */
	status_t (*shadow_changed)(partition_data *partition,
				uint32 operation);

	/* writing (the device is NOT locked) */
	status_t (*defragment)(int fd, partition_id partition,
				disk_job_id job);
	status_t (*repair)(int fd, partition_id partition, bool checkOnly,
				disk_job_id job);
	status_t (*resize)(int fd, partition_id partition, off_t size,
				disk_job_id job);
	status_t (*move)(int fd, partition_id partition, off_t offset,
				disk_job_id job);
	status_t (*set_content_name)(int fd, partition_id partition,
				const char *name, disk_job_id job);
	status_t (*set_content_parameters)(int fd, partition_id partition,
				const char *parameters, disk_job_id job);
	status_t (*initialize)(const char *partition, const char *name,
				const char *parameters, disk_job_id job);
		// This is pretty close to how the hook in R5 looked. Save the job ID,
		// of course and that the parameters were given as (void*, size_t) pair.
} file_system_module_info;


/* file system add-ons only prototypes */
extern status_t new_vnode(mount_id mountID, vnode_id vnodeID,
					fs_vnode privateNode);
extern status_t publish_vnode(mount_id mountID, vnode_id vnodeID,
					fs_vnode privateNode);
extern status_t get_vnode(mount_id mountID, vnode_id vnodeID,
					fs_vnode *_privateNode);
extern status_t put_vnode(mount_id mountID, vnode_id vnodeID);
extern status_t remove_vnode(mount_id mountID, vnode_id vnodeID);
extern status_t unremove_vnode(mount_id mountID, vnode_id vnodeID);
extern status_t unremove_vnode(mount_id mountID, vnode_id vnodeID);
extern status_t is_vnode_removed(mount_id mountID, vnode_id vnodeID);

extern status_t notify_listener(int op, mount_id device, vnode_id parentNode,
					vnode_id toParentNode, vnode_id node, const char *name);
extern status_t send_notification(port_id port, long token, ulong what, long op,
					mount_id device, mount_id toDevice, vnode_id parentNode,
					vnode_id toParentNode, vnode_id node, const char *name);

extern status_t notify_entry_created(mount_id device, vnode_id directory,
					const char *name, vnode_id node);
extern status_t notify_entry_removed(mount_id device, vnode_id directory,
					const char *name, vnode_id node);
extern status_t notify_entry_moved(mount_id device, vnode_id fromDirectory,
					const char *fromName, vnode_id toDirectory,
					const char *toName, vnode_id node);
extern status_t notify_stat_changed(mount_id device, vnode_id node,
					uint32 statFields);
extern status_t notify_attribute_changed(mount_id device, vnode_id node,
					const char *attribute, int32 cause);

extern status_t notify_query_entry_created(port_id port, int32 token,
					mount_id device, vnode_id directory, const char *name,
					vnode_id node);
extern status_t notify_query_entry_removed(port_id port, int32 token,
					mount_id device, vnode_id directory, const char *name,
					vnode_id node);

#ifdef __cplusplus
}
#endif

#endif	/* _FS_INTERFACE_H */