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/*
* 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 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_FS_TMPNODE_H
#define _SYS_FS_TMPNODE_H
#include <sys/t_lock.h>
#include <vm/seg.h>
#include <vm/seg_vn.h>
#include <sys/vfs_opreg.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* tmpnode is the file system dependent node for tmpfs.
*
* tn_rwlock protects access of the directory list at tn_dir
* as well as syncronizing read and writes to the tmpnode
*
* tn_contents protects growing, shrinking, reading and writing
* the file along with tn_rwlock (see below).
*
* tn_tlock protects updates to tn_mode and tn_nlink
*
* tm_contents in the tmount filesystem data structure protects
* tn_forw and tn_back which are used to maintain a linked
* list of all tmpfs files associated with that file system
*
* The anon array represents the secondary store for tmpfs.
* To grow or shrink the file or fill in holes requires
* manipulation of the anon array. These operations are protected
* by a combination of tn_rwlock and tn_contents. Growing or shrinking
* the array requires the write lock on tn_rwlock and tn_contents.
* Filling in a slot in the array requires the write lock on tn_contents.
* Reading the array requires the read lock on tn_contents.
*
* The ordering of the locking is:
* tn_rwlock -> tn_contents -> page locks on pages in file
*
* tn_tlock doesn't require any tmpnode locks
*/
struct tmpnode {
struct tmpnode *tn_back; /* linked list of tmpnodes */
struct tmpnode *tn_forw; /* linked list of tmpnodes */
union {
struct {
struct tdirent *un_dirlist; /* dirent list */
uint_t un_dirents; /* number of dirents */
} un_dirstruct;
char *un_symlink; /* pointer to symlink */
struct {
struct anon_hdr *un_anon; /* anon backing for file */
pgcnt_t un_size; /* size repres. by array */
} un_anonstruct;
} un_tmpnode;
struct vnode *tn_vnode; /* vnode for this tmpnode */
int tn_gen; /* pseudo gen number for tfid */
struct vattr tn_attr; /* attributes */
krwlock_t tn_contents; /* vm side -serialize mods */
krwlock_t tn_rwlock; /* rw,trunc size - serialize */
/* mods and directory updates */
kmutex_t tn_tlock; /* time, flag, and nlink lock */
struct tmpnode *tn_xattrdp; /* ext. attribute directory */
uint_t tn_flags; /* tmpnode specific flags */
};
#define tn_dir un_tmpnode.un_dirstruct.un_dirlist
#define tn_dirents un_tmpnode.un_dirstruct.un_dirents
#define tn_symlink un_tmpnode.un_symlink
#define tn_anon un_tmpnode.un_anonstruct.un_anon
#define tn_asize un_tmpnode.un_anonstruct.un_size
/*
* tmnode flag values.
*/
#define ISXATTR 0x1
/*
* Attributes
*/
#define tn_mask tn_attr.va_mask
#define tn_type tn_attr.va_type
#define tn_mode tn_attr.va_mode
#define tn_uid tn_attr.va_uid
#define tn_gid tn_attr.va_gid
#define tn_fsid tn_attr.va_fsid
#define tn_nodeid tn_attr.va_nodeid
#define tn_nlink tn_attr.va_nlink
#define tn_size tn_attr.va_size
#define tn_atime tn_attr.va_atime
#define tn_mtime tn_attr.va_mtime
#define tn_ctime tn_attr.va_ctime
#define tn_rdev tn_attr.va_rdev
#define tn_blksize tn_attr.va_blksize
#define tn_nblocks tn_attr.va_nblocks
#define tn_seq tn_attr.va_seq
/*
* tmpfs directories are made up of a linked list of tdirent structures
* hanging off directory tmpnodes. File names are not fixed length,
* but are null terminated.
*/
struct tdirent {
struct tmpnode *td_tmpnode; /* tnode for this file */
struct tdirent *td_next; /* next directory entry */
struct tdirent *td_prev; /* prev directory entry */
uint_t td_offset; /* "offset" of dir entry */
uint_t td_hash; /* a hash of td_name */
struct tdirent *td_link; /* linked via the hash table */
struct tmpnode *td_parent; /* parent, dir we are in */
char *td_name; /* must be null terminated */
/* max length is MAXNAMELEN */
};
/*
* tfid overlays the fid structure (for VFS_VGET)
*/
struct tfid {
uint16_t tfid_len;
ino32_t tfid_ino;
int32_t tfid_gen;
};
#define ESAME (-1) /* trying to rename linked files (special) */
extern struct vnodeops *tmp_vnodeops;
extern const struct fs_operation_def tmp_vnodeops_template[];
#ifdef __cplusplus
}
#endif
#endif /* _SYS_FS_TMPNODE_H */
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