FreeBSD/Linux Kernel Cross Reference
sys/coda/cnode.h
1 /* $NetBSD: cnode.h,v 1.17 2008/03/21 17:59:57 plunky Exp $ */
2
3 /*
4 *
5 * Coda: an Experimental Distributed File System
6 * Release 3.1
7 *
8 * Copyright (c) 1987-1998 Carnegie Mellon University
9 * All Rights Reserved
10 *
11 * Permission to use, copy, modify and distribute this software and its
12 * documentation is hereby granted, provided that both the copyright
13 * notice and this permission notice appear in all copies of the
14 * software, derivative works or modified versions, and any portions
15 * thereof, and that both notices appear in supporting documentation, and
16 * that credit is given to Carnegie Mellon University in all documents
17 * and publicity pertaining to direct or indirect use of this code or its
18 * derivatives.
19 *
20 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
21 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
22 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
23 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
24 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
25 * ANY DERIVATIVE WORK.
26 *
27 * Carnegie Mellon encourages users of this software to return any
28 * improvements or extensions that they make, and to grant Carnegie
29 * Mellon the rights to redistribute these changes without encumbrance.
30 *
31 * @(#) coda/cnode.h,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $
32 */
33
34 /*
35 * Mach Operating System
36 * Copyright (c) 1990 Carnegie-Mellon University
37 * Copyright (c) 1989 Carnegie-Mellon University
38 * All rights reserved. The CMU software License Agreement specifies
39 * the terms and conditions for use and redistribution.
40 */
41
42 /*
43 * This code was written for the Coda file system at Carnegie Mellon University.
44 * Contributers include David Steere, James Kistler, and M. Satyanarayanan.
45 */
46
47 #ifndef _CNODE_H_
48 #define _CNODE_H_
49
50 #include <sys/vnode.h>
51 #ifdef _KERNEL
52 #include <sys/mallocvar.h>
53
54 MALLOC_DECLARE(M_CODA);
55 #endif
56
57 /*
58 * Cnode lookup stuff.
59 * NOTE: CODA_CACHESIZE must be a power of 2 for cfshash to work!
60 */
61 #define CODA_CACHESIZE 512
62
63 #define CODA_ALLOC(ptr, cast, size) \
64 do { \
65 ptr = (cast)malloc((unsigned long) size, M_CODA, M_WAITOK); \
66 if (ptr == 0) { \
67 panic("kernel malloc returns 0 at %s:%d\n", __FILE__, __LINE__); \
68 } \
69 } while (/*CONSTCOND*/ 0)
70
71 #define CODA_FREE(ptr, size) free((ptr), M_CODA)
72
73 /*
74 * global cache state control
75 */
76 extern int coda_nc_use;
77
78 /*
79 * Used to select debugging statements throughout the cfs code.
80 */
81 extern int codadebug;
82 extern int coda_nc_debug;
83 extern int coda_printf_delay;
84 extern int coda_vnop_print_entry;
85 extern int coda_psdev_print_entry;
86 extern int coda_vfsop_print_entry;
87
88 #define CODADBGMSK(N) (1 << N)
89 #define CODADEBUG(N, STMT) { if (codadebug & CODADBGMSK(N)) { STMT } }
90 #define myprintf(args) \
91 do { \
92 if (coda_printf_delay) \
93 DELAY(coda_printf_delay);\
94 printf args ; \
95 } while (/*CONSTCOND*/ 0)
96
97 struct cnode {
98 struct vnode *c_vnode;
99 u_short c_flags; /* flags (see below) */
100 CodaFid c_fid; /* file handle */
101 struct vnode *c_ovp; /* open vnode pointer */
102 u_short c_ocount; /* count of openers */
103 u_short c_owrite; /* count of open for write */
104 struct vattr c_vattr; /* attributes */
105 char *c_symlink; /* pointer to symbolic link */
106 u_short c_symlen; /* length of symbolic link */
107 dev_t c_device; /* associated vnode device */
108 ino_t c_inode; /* associated vnode inode */
109 struct cnode *c_next; /* links if on NetBSD machine */
110 };
111 #define VTOC(vp) ((struct cnode *)(vp)->v_data)
112 #define SET_VTOC(vp) ((vp)->v_data)
113 #define CTOV(cp) ((struct vnode *)((cp)->c_vnode))
114
115 /* flags */
116 #define C_VATTR 0x01 /* Validity of vattr in the cnode */
117 #define C_SYMLINK 0x02 /* Validity of symlink pointer in the Code */
118 #define C_WANTED 0x08 /* Set if lock wanted */
119 #define C_LOCKED 0x10 /* Set if lock held */
120 #define C_UNMOUNTING 0X20 /* Set if unmounting */
121 #define C_PURGING 0x40 /* Set if purging a fid */
122
123 #define VALID_VATTR(cp) ((cp->c_flags) & C_VATTR)
124 #define VALID_SYMLINK(cp) ((cp->c_flags) & C_SYMLINK)
125 #define IS_UNMOUNTING(cp) ((cp)->c_flags & C_UNMOUNTING)
126
127 struct vmsg;
128
129 struct vcomm {
130 u_long vc_seq;
131 int vc_open;
132 struct selinfo vc_selproc;
133 TAILQ_HEAD(,vmsg) vc_requests;
134 TAILQ_HEAD(,vmsg) vc_replies;
135 };
136
137 #define VC_OPEN(vcp) ((vcp)->vc_open == 1)
138 #define MARK_VC_CLOSED(vcp) ((vcp)->vc_open = 0)
139 #define MARK_VC_OPEN(vcp) ((vcp)->vc_open = 1)
140
141 struct coda_clstat {
142 int ncalls; /* client requests */
143 int nbadcalls; /* upcall failures */
144 int reqs[CODA_NCALLS]; /* count of each request */
145 };
146 extern struct coda_clstat coda_clstat;
147
148 /*
149 * CODA structure to hold mount/file system information
150 */
151 struct coda_mntinfo {
152 struct vnode *mi_rootvp;
153 struct mount *mi_vfsp;
154 struct vcomm mi_vcomm;
155 int mi_started;
156 };
157 extern struct coda_mntinfo coda_mnttbl[]; /* indexed by minor device number */
158
159 /*
160 * vfs pointer to mount info
161 */
162 #define vftomi(vfsp) ((struct coda_mntinfo *)(vfsp->mnt_data))
163 #define CODA_MOUNTED(vfsp) ((vftomi(vfsp) != (struct coda_mntinfo *)0) \
164 && (vftomi(vfsp)->mi_started))
165
166 /*
167 * vnode pointer to mount info
168 */
169 #define vtomi(vp) ((struct coda_mntinfo *)(vp->v_mount->mnt_data))
170
171 /*
172 * Used for identifying usage of "Control" object
173 */
174 extern struct vnode *coda_ctlvp;
175 #define IS_CTL_VP(vp) ((vp) == coda_ctlvp)
176 #define IS_CTL_NAME(vp, name, l)((l == CODA_CONTROLLEN) \
177 && ((vp) == vtomi((vp))->mi_rootvp) \
178 && strncmp(name, CODA_CONTROL, l) == 0)
179
180 /*
181 * An enum to tell us whether something that will remove a reference
182 * to a cnode was a downcall or not
183 */
184 enum dc_status {
185 IS_DOWNCALL = 6,
186 NOT_DOWNCALL = 7
187 };
188
189 /* cfs_psdev.h */
190 extern int coda_call(struct coda_mntinfo *mntinfo, int inSize, int *outSize, void *buffer);
191 extern int coda_kernel_version;
192
193 /* cfs_subr.h */
194 extern int handleDownCall(int opcode, union outputArgs *out);
195 extern void coda_unmounting(struct mount *whoIam);
196 extern int coda_vmflush(struct cnode *cp);
197
198 /* cfs_vnodeops.h */
199 extern struct cnode *make_coda_node(CodaFid *fid, struct mount *vfsp, short type);
200 extern int coda_vnodeopstats_init(void);
201
202 /* coda_vfsops.h */
203 extern struct mount *devtomp(dev_t dev);
204
205 /* sigh */
206 #define CODA_RDWR ((u_long) 31)
207
208 #endif /* _CNODE_H_ */
209
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