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px4-firmware/nuttx/fs/nfs/nfs_node.h

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/****************************************************************************
* fs/nfs/nfs_node.h
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Copyright (C) 2012 Jose Pablo Rojas Vargas. All rights reserved.
* Author: Jose Pablo Rojas Vargas <jrojas@nx-engineering.com>
*
* Leveraged from OpenBSD:
*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
****************************************************************************/
#ifndef __FS_NFS_NFS_NODE_H
#define __FS_NFS_NFS_NODE_H
/****************************************************************************
* Included Files
****************************************************************************/
#include "nfs.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Values for n_commitflags */
#define NFS_COMMIT_PUSH_VALID 0x0001/* push range valid */
#define NFS_COMMIT_PUSHED_VALID 0x0002/* pushed range valid */
#define n_atim n_un1.nf_atim
#define n_mtim n_un2.nf_mtim
#define n_cookieverf n_un1.nd_cookieverf
#define n_direofoffset n_un2.nd_direof
/* Flags for n_flag */
#define NFLUSHWANT 0x0001/* Want wakeup from a flush in prog. */
#define NFLUSHINPROG 0x0002/* Avoid multiple calls to vinvalbuf() */
#define NMODIFIED 0x0004/* Might have a modified buffer in bio */
#define NWRITEERR 0x0008/* Flag write errors so close will know */
#define NACC 0x0100/* Special file accessed */
#define NUPD 0x0200/* Special file updated */
#define NCHG 0x0400/* Special file times changed */
#define NFS_INVALIDATE_ATTRCACHE(np) ((np)->n_attrstamp = 0)
/* Convert between nfsnode pointers and vnode pointers */
#define VTONFS(vp) ((struct nfsnode *)(vp)->f_priv)
#define NFSTOV(np) ((np)->n_vnode)
/****************************************************************************
* Public Types
****************************************************************************/
/* Silly rename structure that hangs off the nfsnode until the name
* can be removed by nfs_inactive()
struct sillyrename
{
struct ucred *s_cred;
struct vnode *s_dvp;
long s_namlen;
char s_name[24];
};
*/
/* The nfsnode is the nfs equivalent to ufs's inode. Any similarity
* is purely coincidental.
* There is a unique nfsnode allocated for each active file,
* each current directory, each mounted-on file, text file, and the root.
* An nfsnode is 'named' by its file handle. (nget/nfs_node.c)
* If this structure exceeds 256 bytes (it is currently 256 using 4.4BSD-Lite
* type definitions), file handles of > 32 bytes should probably be split out
* into a separate malloc()'d data structure. (Reduce the size of nfsfh_t by
* changing the definition in sys/mount.h of NFS_SMALLFH.)
* NB: Hopefully the current order of the fields is such that everything will
* be well aligned and, therefore, tightly packed.
*/
struct nfsnode
{
struct nfsnode *n_next; /* Retained in a singly linked list filehandle/node tree. */
bool n_open; /* true: The file is (still) open */
uint64_t n_size; /* Current size of file */
struct nfs_fattr n_fattr; /* nfs file attribute cache */
nfstype nfsv3_type; /* File type */
time_t n_attrstamp; /* Attr. cache timestamp */
struct timespec n_mtime; /* Prev modify time. */
time_t n_ctime; /* Prev create time. */
nfsfh_t *n_fhp; /* NFS File Handle */
struct inode *n_inode; /* associated inode */
int n_error; /* Save write error value */
union
{
struct timespec nf_atim; /* Special file times */
nfsuint64 nd_cookieverf; /* Cookie verifier (dir only) */
} n_un1;
union
{
struct timespec nf_mtim;
off_t nd_direoffset; /* Directory EOF offset cache */
} n_un2;
short n_fhsize; /* size in bytes, of fh */
short n_flag; /* Flag for locking.. */
nfsfh_t n_fh; /* Small File Handle */
time_t n_accstamp; /* Access cache timestamp */
uid_t n_accuid; /* Last access requester */
int n_accmode; /* Last mode requested */
int n_accerror; /* Last returned error */
off_t n_pushedlo; /* 1st blk in commited range */
off_t n_pushedhi; /* Last block in range */
off_t n_pushlo; /* 1st block in commit range */
off_t n_pushhi; /* Last block in range */
//struct rwlock n_commitlock; /* Serialize commits */
int n_commitflags;
};
#endif /* __FS_NFS_NFS_NODE_H */
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