1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. 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 8.9 (Berkeley) 5/14/95
37 * $FreeBSD: releng/5.1/sys/nfsclient/nfsnode.h 95590 2002-04-27 22:10:16Z iedowse $
38 */
39
40 #ifndef _NFSCLIENT_NFSNODE_H_
41 #define _NFSCLIENT_NFSNODE_H_
42
43 #if !defined(_NFSCLIENT_NFS_H_) && !defined(_KERNEL)
44 #include <nfs/nfs.h>
45 #endif
46
47 /*
48 * Silly rename structure that hangs off the nfsnode until the name
49 * can be removed by nfs_inactive()
50 */
51 struct sillyrename {
52 struct ucred *s_cred;
53 struct vnode *s_dvp;
54 long s_namlen;
55 char s_name[20];
56 };
57
58 /*
59 * This structure is used to save the logical directory offset to
60 * NFS cookie mappings.
61 * The mappings are stored in a list headed
62 * by n_cookies, as required.
63 * There is one mapping for each NFS_DIRBLKSIZ bytes of directory information
64 * stored in increasing logical offset byte order.
65 */
66 #define NFSNUMCOOKIES 31
67
68 struct nfsdmap {
69 LIST_ENTRY(nfsdmap) ndm_list;
70 int ndm_eocookie;
71 nfsuint64 ndm_cookies[NFSNUMCOOKIES];
72 };
73
74 /*
75 * The nfsnode is the nfs equivalent to ufs's inode. Any similarity
76 * is purely coincidental.
77 * There is a unique nfsnode allocated for each active file,
78 * each current directory, each mounted-on file, text file, and the root.
79 * An nfsnode is 'named' by its file handle. (nget/nfs_node.c)
80 * If this structure exceeds 256 bytes (it is currently 256 using 4.4BSD-Lite
81 * type definitions), file handles of > 32 bytes should probably be split out
82 * into a separate MALLOC()'d data structure. (Reduce the size of nfsfh_t by
83 * changing the definition in nfsproto.h of NFS_SMALLFH.)
84 * NB: Hopefully the current order of the fields is such that everything will
85 * be well aligned and, therefore, tightly packed.
86 */
87 struct nfsnode {
88 LIST_ENTRY(nfsnode) n_hash; /* Hash chain */
89 u_quad_t n_size; /* Current size of file */
90 u_quad_t n_brev; /* Modify rev when cached */
91 u_quad_t n_lrev; /* Modify rev for lease */
92 struct vattr n_vattr; /* Vnode attribute cache */
93 time_t n_attrstamp; /* Attr. cache timestamp */
94 u_int32_t n_mode; /* ACCESS mode cache */
95 uid_t n_modeuid; /* credentials having mode */
96 time_t n_modestamp; /* mode cache timestamp */
97 time_t n_mtime; /* Prev modify time. */
98 time_t n_ctime; /* Prev create time. */
99 time_t n_expiry; /* Lease expiry time */
100 nfsfh_t *n_fhp; /* NFS File Handle */
101 struct vnode *n_vnode; /* associated vnode */
102 struct lockf *n_lockf; /* Locking record of file */
103 int n_error; /* Save write error value */
104 union {
105 struct timespec nf_atim; /* Special file times */
106 nfsuint64 nd_cookieverf; /* Cookie verifier (dir only) */
107 } n_un1;
108 union {
109 struct timespec nf_mtim;
110 off_t nd_direof; /* Dir. EOF offset cache */
111 } n_un2;
112 union {
113 struct sillyrename *nf_silly; /* Ptr to silly rename struct */
114 LIST_HEAD(, nfsdmap) nd_cook; /* cookies */
115 } n_un3;
116 short n_fhsize; /* size in bytes, of fh */
117 short n_flag; /* Flag for locking.. */
118 nfsfh_t n_fh; /* Small File Handle */
119 struct lock n_rslock;
120 };
121
122 #define n_atim n_un1.nf_atim
123 #define n_mtim n_un2.nf_mtim
124 #define n_sillyrename n_un3.nf_silly
125 #define n_cookieverf n_un1.nd_cookieverf
126 #define n_direofoffset n_un2.nd_direof
127 #define n_cookies n_un3.nd_cook
128
129 /*
130 * Flags for n_flag
131 */
132 #define NFLUSHWANT 0x0001 /* Want wakeup from a flush in prog. */
133 #define NFLUSHINPROG 0x0002 /* Avoid multiple calls to vinvalbuf() */
134 #define NMODIFIED 0x0004 /* Might have a modified buffer in bio */
135 #define NWRITEERR 0x0008 /* Flag write errors so close will know */
136 /* 0x20, 0x40, 0x80 free */
137 #define NACC 0x0100 /* Special file accessed */
138 #define NUPD 0x0200 /* Special file updated */
139 #define NCHG 0x0400 /* Special file times changed */
140
141 /*
142 * Convert between nfsnode pointers and vnode pointers
143 */
144 #define VTONFS(vp) ((struct nfsnode *)(vp)->v_data)
145 #define NFSTOV(np) ((struct vnode *)(np)->n_vnode)
146
147 /*
148 * Queue head for nfsiod's
149 */
150 extern TAILQ_HEAD(nfs_bufq, buf) nfs_bufq;
151 extern struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
152 extern struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
153
154 #if defined(_KERNEL)
155
156 /*
157 * nfs_rslock - Attempt to obtain lock on nfsnode
158 *
159 * Attempt to obtain a lock on the passed nfsnode, returning ENOLCK
160 * if the lock could not be obtained due to our having to sleep. This
161 * function is generally used to lock around code that modifies an
162 * NFS file's size. In order to avoid deadlocks the lock
163 * should not be obtained while other locks are being held.
164 */
165
166 static __inline int
167 nfs_rslock(struct nfsnode *np, struct thread *td)
168 {
169
170 return(lockmgr(&np->n_rslock,
171 LK_EXCLUSIVE | LK_CANRECURSE | LK_SLEEPFAIL, NULL, td));
172 }
173
174 static __inline void
175 nfs_rsunlock(struct nfsnode *np, struct thread *td)
176 {
177
178 (void)lockmgr(&np->n_rslock, LK_RELEASE, NULL, td);
179 }
180
181 extern vop_t **fifo_nfsv2nodeop_p;
182 extern vop_t **nfsv2_vnodeop_p;
183 extern vop_t **spec_nfsv2nodeop_p;
184
185 /*
186 * Prototypes for NFS vnode operations
187 */
188 int nfs_getpages(struct vop_getpages_args *);
189 int nfs_putpages(struct vop_putpages_args *);
190 int nfs_write(struct vop_write_args *);
191 int nfs_inactive(struct vop_inactive_args *);
192 int nfs_reclaim(struct vop_reclaim_args *);
193
194 /* other stuff */
195 int nfs_removeit(struct sillyrename *);
196 int nfs_nget(struct mount *, nfsfh_t *, int, struct nfsnode **);
197 nfsuint64 *nfs_getcookie(struct nfsnode *, off_t, int);
198 void nfs_invaldir(struct vnode *);
199
200 #endif /* _KERNEL */
201
202 #endif
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