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Annotation of Net2/nfs/nfsnode.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Rick Macklem at The University of Guelph.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     @(#)nfsnode.h   7.12 (Berkeley) 4/16/91
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * The nfsnode is the nfs equivalent to ufs's inode. Any similarity
        !            41:  * is purely coincidental.
        !            42:  * There is a unique nfsnode allocated for each active file,
        !            43:  * each current directory, each mounted-on file, text file, and the root.
        !            44:  * An nfsnode is 'named' by its file handle. (nget/nfs_node.c)
        !            45:  */
        !            46: 
        !            47: struct nfsnode {
        !            48:        struct  nfsnode *n_chain[2];    /* must be first */
        !            49:        nfsv2fh_t n_fh;                 /* NFS File Handle */
        !            50:        long    n_flag;                 /* Flag for locking.. */
        !            51:        struct  vnode *n_vnode; /* vnode associated with this nfsnode */
        !            52:        time_t  n_attrstamp;    /* Time stamp (sec) for attributes */
        !            53:        struct  vattr n_vattr;  /* Vnode attribute cache */
        !            54:        struct  sillyrename *n_sillyrename;     /* Ptr to silly rename struct */
        !            55:        u_long  n_size;         /* Current size of file */
        !            56:        time_t  n_mtime;        /* Prev modify time to maintain data cache consistency*/
        !            57:        time_t  n_ctime;        /* Prev create time for name cache consistency*/
        !            58:        int     n_error;        /* Save write error value */
        !            59:        pid_t   n_lockholder;   /* holder of nfsnode lock */
        !            60:        pid_t   n_lockwaiter;   /* most recent waiter for nfsnode lock */
        !            61:        u_long  n_direofoffset; /* Dir. EOF offset cache */
        !            62: };
        !            63: 
        !            64: #define        n_forw          n_chain[0]
        !            65: #define        n_back          n_chain[1]
        !            66: 
        !            67: #ifdef KERNEL
        !            68: /*
        !            69:  * Convert between nfsnode pointers and vnode pointers
        !            70:  */
        !            71: #define VTONFS(vp)     ((struct nfsnode *)(vp)->v_data)
        !            72: #define NFSTOV(np)     ((struct vnode *)(np)->n_vnode)
        !            73: #endif
        !            74: /*
        !            75:  * Flags for n_flag
        !            76:  */
        !            77: #define        NLOCKED         0x1     /* Lock the node for other local accesses */
        !            78: #define        NWANT           0x2     /* Want above lock */
        !            79: #define        NMODIFIED       0x4     /* Might have a modified buffer in bio */
        !            80: #define        NWRITEERR       0x8     /* Flag write errors so close will know */
        !            81: 
        !            82: /*
        !            83:  * Prototypes for NFS vnode operations
        !            84:  */
        !            85: int    nfs_lookup __P((
        !            86:                struct vnode *vp,
        !            87:                struct nameidata *ndp,
        !            88:                struct proc *p));
        !            89: int    nfs_create __P((
        !            90:                struct nameidata *ndp,
        !            91:                struct vattr *vap,
        !            92:                struct proc *p));
        !            93: int    nfs_mknod __P((
        !            94:                struct nameidata *ndp,
        !            95:                struct vattr *vap,
        !            96:                struct ucred *cred,
        !            97:                struct proc *p));
        !            98: int    nfs_open __P((
        !            99:                struct vnode *vp,
        !           100:                int mode,
        !           101:                struct ucred *cred,
        !           102:                struct proc *p));
        !           103: int    nfs_close __P((
        !           104:                struct vnode *vp,
        !           105:                int fflag,
        !           106:                struct ucred *cred,
        !           107:                struct proc *p));
        !           108: int    nfs_access __P((
        !           109:                struct vnode *vp,
        !           110:                int mode,
        !           111:                struct ucred *cred,
        !           112:                struct proc *p));
        !           113: int    nfs_getattr __P((
        !           114:                struct vnode *vp,
        !           115:                struct vattr *vap,
        !           116:                struct ucred *cred,
        !           117:                struct proc *p));
        !           118: int    nfs_setattr __P((
        !           119:                struct vnode *vp,
        !           120:                struct vattr *vap,
        !           121:                struct ucred *cred,
        !           122:                struct proc *p));
        !           123: int    nfs_read __P((
        !           124:                struct vnode *vp,
        !           125:                struct uio *uio,
        !           126:                int ioflag,
        !           127:                struct ucred *cred));
        !           128: int    nfs_write __P((
        !           129:                struct vnode *vp,
        !           130:                struct uio *uio,
        !           131:                int ioflag,
        !           132:                struct ucred *cred));
        !           133: #define nfs_ioctl ((int (*) __P(( \
        !           134:                struct vnode *vp, \
        !           135:                int command, \
        !           136:                caddr_t data, \
        !           137:                int fflag, \
        !           138:                struct ucred *cred, \
        !           139:                struct proc *p))) enoioctl)
        !           140: #define nfs_select ((int (*) __P(( \
        !           141:                struct vnode *vp, \
        !           142:                int which, \
        !           143:                int fflags, \
        !           144:                struct ucred *cred, \
        !           145:                struct proc *p))) seltrue)
        !           146: int    nfs_mmap __P((
        !           147:                struct vnode *vp,
        !           148:                int fflags,
        !           149:                struct ucred *cred,
        !           150:                struct proc *p));
        !           151: int    nfs_fsync __P((
        !           152:                struct vnode *vp,
        !           153:                int fflags,
        !           154:                struct ucred *cred,
        !           155:                int waitfor,
        !           156:                struct proc *p));
        !           157: #define nfs_seek ((int (*) __P(( \
        !           158:                struct vnode *vp, \
        !           159:                off_t oldoff, \
        !           160:                off_t newoff, \
        !           161:                struct ucred *cred))) nullop)
        !           162: int    nfs_remove __P((
        !           163:                struct nameidata *ndp,
        !           164:                struct proc *p));
        !           165: int    nfs_link __P((
        !           166:                struct vnode *vp,
        !           167:                struct nameidata *ndp,
        !           168:                struct proc *p));
        !           169: int    nfs_rename __P((
        !           170:                struct nameidata *fndp,
        !           171:                struct nameidata *tdnp,
        !           172:                struct proc *p));
        !           173: int    nfs_mkdir __P((
        !           174:                struct nameidata *ndp,
        !           175:                struct vattr *vap,
        !           176:                struct proc *p));
        !           177: int    nfs_rmdir __P((
        !           178:                struct nameidata *ndp,
        !           179:                struct proc *p));
        !           180: int    nfs_symlink __P((
        !           181:                struct nameidata *ndp,
        !           182:                struct vattr *vap,
        !           183:                char *target,
        !           184:                struct proc *p));
        !           185: int    nfs_readdir __P((
        !           186:                struct vnode *vp,
        !           187:                struct uio *uio,
        !           188:                struct ucred *cred,
        !           189:                int *eofflagp));
        !           190: int    nfs_readlink __P((
        !           191:                struct vnode *vp,
        !           192:                struct uio *uio,
        !           193:                struct ucred *cred));
        !           194: int    nfs_abortop __P((
        !           195:                struct nameidata *ndp));
        !           196: int    nfs_inactive __P((
        !           197:                struct vnode *vp,
        !           198:                struct proc *p));
        !           199: int    nfs_reclaim __P((
        !           200:                struct vnode *vp));
        !           201: int    nfs_lock __P((
        !           202:                struct vnode *vp));
        !           203: int    nfs_unlock __P((
        !           204:                struct vnode *vp));
        !           205: int    nfs_bmap __P((
        !           206:                struct vnode *vp,
        !           207:                daddr_t bn,
        !           208:                struct vnode **vpp,
        !           209:                daddr_t *bnp));
        !           210: int    nfs_strategy __P((
        !           211:                struct buf *bp));
        !           212: int    nfs_print __P((
        !           213:                struct vnode *vp));
        !           214: int    nfs_islocked __P((
        !           215:                struct vnode *vp));
        !           216: int    nfs_advlock __P((
        !           217:                struct vnode *vp,
        !           218:                caddr_t id,
        !           219:                int op,
        !           220:                struct flock *fl,
        !           221:                int flags));

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