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/*
Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef _GLFS_HANDLES_H
#define _GLFS_HANDLES_H
#include "glfs.h"
/* GLFS OBJECT BASED OPERATIONS
*
* The following APIs are introduced to provide an API framework that can work
* with gluster objects (files and directories), instead of absolute paths.
*
* The following API set can be related to the POSIX *at interfaces (like
* openat (2)). The intention of these APIs is to be able to operate based
* on parent object and looking up or creating child objects within, OR to be
* used on the actual object thus looked up or created, and retrieve information
* regarding the same.
*
* The APIs also provide for generating an opaque invariant handle to the
* object, that can later be used to lookup the object, instead of the regular
* glfs_h_* variants. The APIs that provide this behaviour are,
* glfs_h_extract_handle and glfs_h_create_from_handle.
*
* The object handles can be transitioned to fd based operations as supported
* by glfs.h calls, using the glfs_h_open call. This provides a way to move
* from objects to fd's akin to moving from path to fd for required operations.
*
* NOTE: The opaque invariant handle is the GFID of the object in reality, but
* maintained as an opaque data value, for potential internal changes to the
* same without impacting the caller.
*
* NOTE: Currently looking up an object can create multiple object handles to
* the same, i.e distinct glfs_object *. Hence each such looked up or received
* handle from other calls, would need to be closed. In the future, for a given
* object these pointers would be the same, and an ease of use API to forget all
* instances of this bject would be provided (instead of a per lookup close).
* This should not change the APIs in their current form.
*
*/
/* Values for valid falgs to be used when using XXXsetattr, to set multiple
attribute values passed via the related stat structure.
*/
#define GFAPI_SET_ATTR_MODE 0x1
#define GFAPI_SET_ATTR_UID 0x2
#define GFAPI_SET_ATTR_GID 0x4
#define GFAPI_SET_ATTR_SIZE 0x8
#define GFAPI_SET_ATTR_ATIME 0x10
#define GFAPI_SET_ATTR_MTIME 0x20
/* Handle length for object handles returned from glfs_h_extract_handle or
* glfs_h_create_from_handle */
#define GFAPI_HANDLE_LENGTH 16
/* Portability non glibc c++ build systems */
#ifndef __THROW
# if defined __cplusplus
# define __THROW throw ()
# else
# define __THROW
# endif
#endif
__BEGIN_DECLS
/*
* Notes:
*
* The file object handle. One per looked up, created file/directory
*
* This had been introduced to facilitate gfid/inode based gfapi
* - a requirement introduced by nfs-ganesha
*/
struct glfs_object;
typedef struct glfs_object glfs_object_t;
/* Handle based operations */
/* Operations that generate handles */
struct glfs_object *glfs_h_lookupat (struct glfs *fs,
struct glfs_object *parent,
const char *path,
struct stat *stat) __THROW;
struct glfs_object *glfs_h_creat (struct glfs *fs, struct glfs_object *parent,
const char *path, int flags, mode_t mode,
struct stat *sb) __THROW;
struct glfs_object *glfs_h_mkdir (struct glfs *fs, struct glfs_object *parent,
const char *path, mode_t flags,
struct stat *sb) __THROW;
struct glfs_object *glfs_h_mknod (struct glfs *fs, struct glfs_object *parent,
const char *path, mode_t mode, dev_t dev,
struct stat *sb) __THROW;
struct glfs_object *glfs_h_symlink (struct glfs *fs, struct glfs_object *parent,
const char *name, const char *data,
struct stat *stat) __THROW;
/* Operations on the actual objects */
int glfs_h_unlink (struct glfs *fs, struct glfs_object *parent,
const char *path) __THROW;
int glfs_h_close (struct glfs_object *object) __THROW;
int glfs_caller_specific_init (void *uid_caller_key, void *gid_caller_key,
void *future) __THROW;
int glfs_h_truncate (struct glfs *fs, struct glfs_object *object,
off_t offset) __THROW;
int glfs_h_stat(struct glfs *fs, struct glfs_object *object,
struct stat *stat) __THROW;
int glfs_h_getattrs (struct glfs *fs, struct glfs_object *object,
struct stat *stat) __THROW;
int glfs_h_getxattrs (struct glfs *fs, struct glfs_object *object,
const char *name, void *value,
size_t size) __THROW;
int glfs_h_setattrs (struct glfs *fs, struct glfs_object *object,
struct stat *sb, int valid) __THROW;
int glfs_h_setxattrs (struct glfs *fs, struct glfs_object *object,
const char *name, const void *value,
size_t size, int flags) __THROW;
int glfs_h_readlink (struct glfs *fs, struct glfs_object *object, char *buf,
size_t bufsiz) __THROW;
int glfs_h_link (struct glfs *fs, struct glfs_object *linktgt,
struct glfs_object *parent, const char *name) __THROW;
int glfs_h_rename (struct glfs *fs, struct glfs_object *olddir,
const char *oldname, struct glfs_object *newdir,
const char *newname) __THROW;
int glfs_h_removexattrs (struct glfs *fs, struct glfs_object *object,
const char *name) __THROW;
/* Operations enabling opaque invariant handle to object transitions */
ssize_t glfs_h_extract_handle (struct glfs_object *object,
unsigned char *handle, int len) __THROW;
struct glfs_object *glfs_h_create_from_handle (struct glfs *fs,
unsigned char *handle, int len,
struct stat *stat) __THROW;
/* Operations enabling object handles to fd transitions */
struct glfs_fd *glfs_h_opendir (struct glfs *fs,
struct glfs_object *object) __THROW;
struct glfs_fd *glfs_h_open (struct glfs *fs, struct glfs_object *object,
int flags) __THROW;
__END_DECLS
#endif /* !_GLFS_HANDLES_H */
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