Annotation of src/share/doc/papers/fsinterface/slides.t, Revision 1.3
1.3 ! agc 1: .\" $NetBSD: slides.t,v 1.2 1998/01/09 06:41:07 perry Exp $
1.2 perry 2: .\"
1.1 cgd 3: .\" Copyright (c) 1986 The Regents of the University of California.
4: .\" All rights reserved.
5: .\"
6: .\" Redistribution and use in source and binary forms, with or without
7: .\" modification, are permitted provided that the following conditions
8: .\" are met:
9: .\" 1. Redistributions of source code must retain the above copyright
10: .\" notice, this list of conditions and the following disclaimer.
11: .\" 2. Redistributions in binary form must reproduce the above copyright
12: .\" notice, this list of conditions and the following disclaimer in the
13: .\" documentation and/or other materials provided with the distribution.
1.3 ! agc 14: .\" 3. Neither the name of the University nor the names of its contributors
1.1 cgd 15: .\" may be used to endorse or promote products derived from this software
16: .\" without specific prior written permission.
17: .\"
18: .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19: .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22: .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23: .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24: .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25: .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26: .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27: .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28: .\" SUCH DAMAGE.
29: .\"
30: .\" @(#)slides.t 5.2 (Berkeley) 4/16/91
31: .\"
32: .so macros
33: .nf
34: .LL
35: Encapsulation of namei parameters
36: .NP 0
37: .ta .5i +\w'caddr_t\0\0'u +\w'struct\0\0'u +\w'vnode *nc_prevdir;\0\0\0\0\0'u
38: struct nameidata {
39: /* arguments and context: */
40: caddr_t ni_dirp;
41: enum uio_seg ni_seg;
42: short ni_nameiop;
43: struct vnode *ni_cdir;
44: struct vnode *ni_rdir;
45: struct ucred *ni_cred;
46: .sp .2
47: /* shared with lookup and commit: */
48: caddr_t ni_pnbuf;
49: char *ni_ptr;
50: int ni_pathlen;
51: short ni_more;
52: short ni_loopcnt;
53: .sp .2
54: /* results: */
55: struct vnode *ni_vp;
56: struct vnode *ni_dvp;
57: .sp .2
58: /* BEGIN UFS SPECIFIC */
59: struct diroffcache {
60: struct vnode *nc_prevdir;
61: long nc_id;
62: off_t nc_prevoffset;
63: } ni_nc;
64: /* END UFS SPECIFIC */
65: };
66: .bp
67:
68:
69: .LL
70: Namei operations and modifiers
71:
72: .NP 0
73: .ta \w'#define\0\0'u +\w'WANTPARENT\0\0'u +\w'0x40\0\0\0\0\0\0\0'u
74: #define LOOKUP 0 /* name lookup only */
75: #define CREATE 1 /* setup for creation */
76: #define DELETE 2 /* setup for deletion */
77: #define WANTPARENT 0x10 /* return parent vnode also */
78: #define NOCACHE 0x20 /* remove name from cache */
79: #define FOLLOW 0x40 /* follow symbolic links */
80: .bp
81:
82: .LL
83: Namei operations and modifiers
84:
85: .NP 0
86: .ta \w'#define\0\0'u +\w'WANTPARENT\0\0'u +\w'0x40\0\0\0\0\0\0\0'u
87: #define LOOKUP 0
88: #define CREATE 1
89: #define DELETE 2
90: #define WANTPARENT 0x10
91: #define NOCACHE 0x20
92: #define FOLLOW 0x40
93: .bp
94:
95:
96: .LL
97: Credentials
98:
99: .NP 0
100: .ta .5i +\w'caddr_t\0\0\0'u +\w'struct\0\0'u +\w'vnode *nc_prevdir;\0\0\0\0\0'u
101: struct ucred {
102: u_short cr_ref;
103: uid_t cr_uid;
104: short cr_ngroups;
105: gid_t cr_groups[NGROUPS];
106: /*
107: * The following either should not be here,
108: * or should be treated as opaque.
109: */
110: uid_t cr_ruid;
111: gid_t cr_svgid;
112: };
113: .bp
114: .LL
115: Scatter-gather I/O
116: .NP 0
117: .ta .5i +\w'caddr_t\0\0\0'u +\w'struct\0\0'u +\w'vnode *nc_prevdir;\0\0\0\0\0'u
118: struct uio {
119: struct iovec *uio_iov;
120: int uio_iovcnt;
121: off_t uio_offset;
122: int uio_resid;
123: enum uio_rw uio_rw;
124: };
125:
126: enum uio_rw { UIO_READ, UIO_WRITE };
127:
128:
129:
130: .ta .5i +\w'caddr_t\0\0\0'u +\w'vnode *nc_prevdir;\0\0\0\0\0'u
131: struct iovec {
132: caddr_t iov_base;
133: int iov_len;
134: enum uio_seg iov_segflg;
135: int (*iov_op)();
136: };
137: .bp
138: .LL
139: Per-filesystem information
140: .NP 0
141: .ta .25i +\w'struct vfsops\0\0\0'u +\w'*vfs_vnodecovered;\0\0\0\0\0'u
142: struct vfs {
143: struct vfs *vfs_next;
144: \fB+\fP struct vfs *vfs_prev;
145: struct vfsops *vfs_op;
146: struct vnode *vfs_vnodecovered;
147: int vfs_flag;
148: \fB!\fP int vfs_fsize;
149: \fB+\fP int vfs_bsize;
150: \fB!\fP uid_t vfs_exroot;
151: short vfs_exflags;
152: caddr_t vfs_data;
153: };
154:
155: .NP 0
156: .ta \w'\fB+\fP 'u +\w'#define\0\0'u +\w'VFS_EXPORTED\0\0'u +\w'0x40\0\0\0\0\0'u
157: /* vfs flags: */
158: #define VFS_RDONLY 0x01
159: \fB+\fP #define VFS_NOEXEC 0x02
160: #define VFS_MLOCK 0x04
161: #define VFS_MWAIT 0x08
162: #define VFS_NOSUID 0x10
163: #define VFS_EXPORTED 0x20
164:
165: /* exported vfs flags: */
166: #define EX_RDONLY 0x01
167: .bp
168:
169:
170: .LL
171: Operations supported on virtual file system.
172:
173: .NP 0
174: .ta .25i +\w'int\0\0'u +\w'*vfs_mountroot();\0'u
175: struct vfsops {
176: \fB!\fP int (*vfs_mount)(vfs, path, data, len);
177: \fB!\fP int (*vfs_unmount)(vfs, forcibly);
178: \fB+\fP int (*vfs_mountroot)();
179: int (*vfs_root)(vfs, vpp);
180: int (*vfs_statfs)(vfs, sbp);
181: \fB!\fP int (*vfs_sync)(vfs, waitfor);
182: \fB+\fP int (*vfs_fhtovp)(vfs, fhp, vpp);
183: \fB+\fP int (*vfs_vptofh)(vp, fhp);
184: };
185: .bp
186:
187:
188: .LL
189: Dynamic file system information
190:
191: .NP 0
192: .ta .5i +\w'struct\0\0\0'u +\w'*vfs_vnodecovered;\0\0\0\0\0'u
193: struct statfs {
194: \fB!\fP short f_type;
195: \fB+\fP short f_flags;
196: \fB!\fP long f_fsize;
197: \fB+\fP long f_bsize;
198: long f_blocks;
199: long f_bfree;
200: long f_bavail;
201: long f_files;
202: long f_ffree;
203: fsid_t f_fsid;
204: \fB+\fP char *f_mntonname;
205: \fB+\fP char *f_mntfromname;
206: long f_spare[7];
207: };
208:
209: typedef long fsid_t[2];
210: .bp
211: .LL
212: Filesystem objects (vnodes)
213: .NP 0
214: .ta .25i +\w'struct vnodeops\0\0'u +\w'*v_vfsmountedhere;\0\0\0'u
215: enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK };
216:
217: struct vnode {
218: u_short v_flag;
219: u_short v_count;
220: u_short v_shlockc;
221: u_short v_exlockc;
222: struct vfs *v_vfsmountedhere;
223: struct vfs *v_vfsp;
224: struct vnodeops *v_op;
225: \fB+\fP struct text *v_text;
226: enum vtype v_type;
227: caddr_t v_data;
228: };
229: .ta \w'#define\0\0'u +\w'NOFOLLOW\0\0'u +\w'0x40\0\0\0\0\0\0\0'u
230:
231: /* vnode flags */
232: #define VROOT 0x01
233: #define VTEXT 0x02
234: #define VEXLOCK 0x10
235: #define VSHLOCK 0x20
236: #define VLWAIT 0x40
237: .bp
238: .LL
239: Operations on vnodes
240:
241: .NP 0
242: .ta .25i +\w'int\0\0'u +\w'(*vn_getattr)(\0\0\0\0\0'u
243: struct vnodeops {
244: \fB!\fP int (*vn_lookup)(ndp);
245: \fB!\fP int (*vn_create)(ndp, vap, fflags);
246: \fB+\fP int (*vn_mknod)(ndp, vap, fflags);
247: \fB!\fP int (*vn_open)(vp, fflags, cred);
248: int (*vn_close)(vp, fflags, cred);
249: int (*vn_access)(vp, fflags, cred);
250: int (*vn_getattr)(vp, vap, cred);
251: int (*vn_setattr)(vp, vap, cred);
252: .sp .5
253: \fB+\fP int (*vn_read)(vp, uiop,
254: offp, ioflag, cred);
255: \fB+\fP int (*vn_write)(vp, uiop,
256: offp, ioflag, cred);
257: \fB!\fP int (*vn_ioctl)(vp, com,
258: data, fflag, cred);
259: int (*vn_select)(vp, which, cred);
260: \fB+\fP int (*vn_mmap)(vp, ..., cred);
261: int (*vn_fsync)(vp, cred);
262: \fB+\fP int (*vn_seek)(vp, offp, off,
263: whence);
264: .bp
265: .LL
266: Operations on vnodes (cont)
267:
268: .NP 0
269: .ta .25i +\w'int\0\0'u +\w'(*vn_getattr)(\0\0\0\0\0'u
270:
271: \fB!\fP int (*vn_remove)(ndp);
272: \fB!\fP int (*vn_link)(vp, ndp);
273: \fB!\fP int (*vn_rename)(sndp, tndp);
274: \fB!\fP int (*vn_mkdir)(ndp, vap);
275: \fB!\fP int (*vn_rmdir)(ndp);
276: \fB!\fP int (*vn_symlink)(ndp, vap, nm);
277: \fB!\fP int (*vn_readdir)(vp, uiop,
278: offp, ioflag, cred);
279: \fB!\fP int (*vn_readlink)(vp, uiop,
280: offp, ioflag, cred);
281: .sp .5
282: \fB+\fP int (*vn_abortop)(ndp);
283: \fB!\fP int (*vn_inactive)(vp);
284: };
285:
286: .NP 0
287: .ta \w'#define\0\0'u +\w'NOFOLLOW\0\0'u +\w'0x40\0\0\0\0\0'u
288: /* flags for ioflag */
289: #define IO_UNIT 0x01
290: #define IO_APPEND 0x02
291: #define IO_SYNC 0x04
292: .bp
293:
294: .LL
295: Vnode attributes
296:
297: .NP 0
298: .ta .5i +\w'struct timeval\0\0'u +\w'*v_vfsmountedhere;\0\0\0'u
299: struct vattr {
300: enum vtype va_type;
301: u_short va_mode;
302: \fB!\fP uid_t va_uid;
303: \fB!\fP gid_t va_gid;
304: long va_fsid;
305: \fB!\fP long va_fileid;
306: short va_nlink;
307: u_long va_size;
308: \fB+\fP u_long va_size1;
309: long va_blocksize;
310: struct timeval va_atime;
311: struct timeval va_mtime;
312: struct timeval va_ctime;
313: dev_t va_rdev;
314: \fB!\fP u_long va_bytes;
315: \fB+\fP u_long va_bytes1;
316: };
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