FreeBSD/Linux Kernel Cross Reference
sys/coda/cnode.h
1 /*-
2 *
3 * Coda: an Experimental Distributed File System
4 * Release 3.1
5 *
6 * Copyright (c) 1987-1998 Carnegie Mellon University
7 * All Rights Reserved
8 *
9 * Permission to use, copy, modify and distribute this software and its
10 * documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation, and
14 * that credit is given to Carnegie Mellon University in all documents
15 * and publicity pertaining to direct or indirect use of this code or its
16 * derivatives.
17 *
18 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
19 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
20 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
21 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
22 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
23 * ANY DERIVATIVE WORK.
24 *
25 * Carnegie Mellon encourages users of this software to return any
26 * improvements or extensions that they make, and to grant Carnegie
27 * Mellon the rights to redistribute these changes without encumbrance.
28 *
29 * @(#) src/sys/coda/cnode.h,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
30 * $FreeBSD: releng/5.4/sys/coda/cnode.h 141016 2005-01-30 01:00:13Z imp $
31 *
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 filesystem 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 #include <sys/lock.h>
52 #include <machine/clock.h>
53
54 MALLOC_DECLARE(M_CODA);
55
56 /*
57 * tmp below since we need struct queue
58 */
59 #include <coda/coda_kernel.h>
60
61 /*
62 * Cnode lookup stuff.
63 * NOTE: CODA_CACHESIZE must be a power of 2 for cfshash to work!
64 */
65 #define CODA_CACHESIZE 512
66
67 #define CODA_ALLOC(ptr, cast, size) \
68 do { \
69 ptr = (cast)malloc((unsigned long) size, M_CODA, M_WAITOK); \
70 if (ptr == 0) { \
71 panic("kernel malloc returns 0 at %s:%d\n", __FILE__, __LINE__); \
72 } \
73 } while (0)
74
75 #define CODA_FREE(ptr, size) free((ptr), M_CODA)
76
77 /*
78 * global cache state control
79 */
80 extern int coda_nc_use;
81
82 /*
83 * Used to select debugging statements throughout the cfs code.
84 */
85 extern int codadebug;
86 extern int coda_nc_debug;
87 extern int coda_printf_delay;
88 extern int coda_vnop_print_entry;
89 extern int coda_psdev_print_entry;
90 extern int coda_vfsop_print_entry;
91
92 #define CODADBGMSK(N) (1 << N)
93 #define CODADEBUG(N, STMT) { if (codadebug & CODADBGMSK(N)) { STMT } }
94 #define myprintf(args) \
95 do { \
96 if (coda_printf_delay) \
97 DELAY(coda_printf_delay);\
98 printf args ; \
99 } while (0)
100
101 struct cnode {
102 struct vnode *c_vnode;
103 u_short c_flags; /* flags (see below) */
104 CodaFid c_fid; /* file handle */
105 struct lock c_lock; /* new lock protocol */
106 struct vnode *c_ovp; /* open vnode pointer */
107 u_short c_ocount; /* count of openers */
108 u_short c_owrite; /* count of open for write */
109 struct vattr c_vattr; /* attributes */
110 char *c_symlink; /* pointer to symbolic link */
111 u_short c_symlen; /* length of symbolic link */
112 struct cdev *c_device; /* associated vnode device */
113 ino_t c_inode; /* associated vnode inode */
114 struct cnode *c_next; /* links if on NetBSD machine */
115 };
116 #define VTOC(vp) ((struct cnode *)(vp)->v_data)
117 #define CTOV(cp) ((struct vnode *)((cp)->c_vnode))
118
119 /* flags */
120 #define C_VATTR 0x01 /* Validity of vattr in the cnode */
121 #define C_SYMLINK 0x02 /* Validity of symlink pointer in the Code */
122 #define C_WANTED 0x08 /* Set if lock wanted */
123 #define C_LOCKED 0x10 /* Set if lock held */
124 #define C_UNMOUNTING 0X20 /* Set if unmounting */
125 #define C_PURGING 0x40 /* Set if purging a fid */
126
127 #define VALID_VATTR(cp) ((cp->c_flags) & C_VATTR)
128 #define VALID_SYMLINK(cp) ((cp->c_flags) & C_SYMLINK)
129 #define IS_UNMOUNTING(cp) ((cp)->c_flags & C_UNMOUNTING)
130
131 struct vcomm {
132 u_long vc_seq;
133 struct selinfo vc_selproc;
134 struct queue vc_requests;
135 struct queue vc_replys;
136 };
137
138 #define VC_OPEN(vcp) ((vcp)->vc_requests.forw != NULL)
139 #define MARK_VC_CLOSED(vcp) (vcp)->vc_requests.forw = NULL;
140 #define MARK_VC_OPEN(vcp) /* MT */
141
142 struct coda_clstat {
143 int ncalls; /* client requests */
144 int nbadcalls; /* upcall failures */
145 int reqs[CODA_NCALLS]; /* count of each request */
146 };
147 extern struct coda_clstat coda_clstat;
148
149 /*
150 * CODA structure to hold mount/filesystem information
151 */
152 struct coda_mntinfo {
153 struct vnode *mi_rootvp;
154 struct mount *mi_vfsp;
155 struct vcomm mi_vcomm;
156 struct cdev *dev;
157 int mi_started;
158 };
159 extern struct coda_mntinfo coda_mnttbl[]; /* indexed by minor device number */
160
161 /*
162 * vfs pointer to mount info
163 */
164 #define vftomi(vfsp) ((struct coda_mntinfo *)(vfsp->mnt_data))
165 #define CODA_MOUNTED(vfsp) (vftomi((vfsp)) != (struct coda_mntinfo *)0)
166
167 /*
168 * vnode pointer to mount info
169 */
170 #define vtomi(vp) ((struct coda_mntinfo *)(vp->v_mount->mnt_data))
171
172 /*
173 * Used for identifying usage of "Control" object
174 */
175 extern struct vnode *coda_ctlvp;
176 #define IS_CTL_VP(vp) ((vp) == coda_ctlvp)
177 #define IS_CTL_NAME(vp, name, l)((l == CODA_CONTROLLEN) \
178 && ((vp) == vtomi((vp))->mi_rootvp) \
179 && strncmp(name, CODA_CONTROL, l) == 0)
180
181 /*
182 * An enum to tell us whether something that will remove a reference
183 * to a cnode was a downcall or not
184 */
185 enum dc_status {
186 IS_DOWNCALL = 6,
187 NOT_DOWNCALL = 7
188 };
189
190 /* cfs_psdev.h */
191 extern int coda_call(struct coda_mntinfo *mntinfo, int inSize, int *outSize, caddr_t buffer);
192 extern int coda_kernel_version;
193
194 /* cfs_subr.h */
195 extern int handleDownCall(int opcode, union outputArgs *out);
196 extern void coda_unmounting(struct mount *whoIam);
197 extern int coda_vmflush(struct cnode *cp);
198
199 /* cfs_vnodeops.h */
200 extern struct cnode *make_coda_node(CodaFid *fid, struct mount *vfsp, short type);
201 extern int coda_vnodeopstats_init(void);
202
203 /* coda_vfsops.h */
204 extern struct mount *devtomp(struct cdev *dev);
205
206 /* sigh */
207 #define CODA_RDWR ((u_long) 31)
208
209 #endif /* _CNODE_H_ */
210
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