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Diffstat (limited to 'usr/src/uts/common/sys/vfs_opreg.h')
| -rw-r--r-- | usr/src/uts/common/sys/vfs_opreg.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/usr/src/uts/common/sys/vfs_opreg.h b/usr/src/uts/common/sys/vfs_opreg.h new file mode 100644 index 0000000000..c9d4d9f699 --- /dev/null +++ b/usr/src/uts/common/sys/vfs_opreg.h @@ -0,0 +1,116 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2007 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#ifndef _SYS_VFS_OPREG_H +#define _SYS_VFS_OPREG_H + +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <sys/vfs.h> +#include <sys/fem.h> + +#ifdef __cplusplus +extern "C" { +#endif + +#ifdef _KERNEL + +/* + * The following union allows us to use C99's "designated initializer" + * feature so that we can have strong typechecking for the operations + * used in the the fs_operation_def structures. + */ + +typedef union fs_func { + fs_generic_func_p fs_generic; /* Generic function signature */ + int (*error)(); /* Signature of error function */ + VFS_OPS; /* Signatures of all vfs operations (vfsops) */ + VNODE_OPS; /* Signatures of all vnode operations (vops) */ + FEM_OPS; /* Signatures of all FEM operations (femops) */ + FSEM_OPS; /* Signatures of all FSEM ops (fsemops) */ +} fs_func_p; + +/* + * File systems use arrays of fs_operation_def structures to form + * name/value pairs of operations. These arrays get passed to: + * + * - vn_make_ops() to create vnodeops + * - vfs_makefsops()/vfs_setfsops() to create vfsops. + */ +typedef struct fs_operation_def { + char *name; /* name of operation (NULL at end) */ + fs_func_p func; /* function implementing operation */ +} fs_operation_def_t; + +/* + * The operation registration mechanism uses two master tables of operations: + * one for vnode operations (vn_ops_table[]) and one for vfs operations + * (vfs_ops_table[]). These tables are arrays of fs_operation_trans_def + * structures. They contain all of the information necessary for the system + * to populate an operations structure (e.g., vnodeops, vfsops). + * + * File systems call registration routines (vfs_setfsops(), vfs_makefsops(), + * and vn_make_ops()) and pass in their operations specification tables + * (arrays of fs_operation_def structures). These routines use the master + * table(s) of operations to build a vnodeops or vfsops structure. + */ +typedef struct fs_operation_trans_def { + char *name; /* name of operation (NULL at end) */ + int offset; /* byte offset within ops vector */ + fs_generic_func_p defaultFunc; /* default function */ + fs_generic_func_p errorFunc; /* error function */ +} fs_operation_trans_def_t; + +/* + * Generic operations vector types (used for vfs/vnode ops registration). + */ + +extern int fs_default(); /* "default" function placeholder */ +extern int fs_error(); /* "error" function placeholder */ + +int fs_build_vector(void *vector, int *unused_ops, + const fs_operation_trans_def_t *translation, + const fs_operation_def_t *operations); + +/* + * Public operations. + */ + +int vn_make_ops(const char *, const struct fs_operation_def *, + vnodeops_t **); +void vn_freevnodeops(vnodeops_t *); + +int vfs_setfsops(int, const fs_operation_def_t *, vfsops_t **); +int vfs_makefsops(const fs_operation_def_t *, vfsops_t **); +void vfs_freevfsops(vfsops_t *); +int vfs_freevfsops_by_type(int); + +#endif /* _KERNEL */ + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_VFS_OPREG_H */ |