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1.1 root 1: /*
2: * Copyright (c) 1989 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
33: * @(#)vnode.h 7.39 (Berkeley) 6/27/91
34: */
35:
36: #ifndef KERNEL
37: #include <machine/endian.h>
38: #endif
39:
40: /*
41: * The vnode is the focus of all file activity in UNIX.
42: * There is a unique vnode allocated for each active file,
43: * each current directory, each mounted-on file, text file, and the root.
44: */
45:
46: /*
47: * vnode types. VNON means no type.
48: */
49: enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD };
50:
51: /*
52: * Vnode tag types.
53: * These are for the benefit of external programs only (e.g., pstat)
54: * and should NEVER be inspected inside the kernel.
55: */
56: enum vtagtype { VT_NON, VT_UFS, VT_NFS, VT_MFS };
57:
58: /*
59: * This defines the maximum size of the private data area
60: * permitted for any file system type. A defined constant
61: * is used rather than a union structure to cut down on the
62: * number of header files that must be included.
63: */
64: #define VN_MAXPRIVATE 188
65:
66: struct vnode {
67: u_long v_flag; /* vnode flags (see below) */
68: short v_usecount; /* reference count of users */
69: short v_writecount; /* reference count of writers */
70: long v_holdcnt; /* page & buffer references */
71: off_t v_lastr; /* last read (read-ahead) */
72: u_long v_id; /* capability identifier */
73: struct mount *v_mount; /* ptr to vfs we are in */
74: struct vnodeops *v_op; /* vnode operations */
75: struct vnode *v_freef; /* vnode freelist forward */
76: struct vnode **v_freeb; /* vnode freelist back */
77: struct vnode *v_mountf; /* vnode mountlist forward */
78: struct vnode **v_mountb; /* vnode mountlist back */
79: struct buf *v_cleanblkhd; /* clean blocklist head */
80: struct buf *v_dirtyblkhd; /* dirty blocklist head */
81: long v_numoutput; /* num of writes in progress */
82: enum vtype v_type; /* vnode type */
83: union {
84: struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
85: struct socket *vu_socket; /* unix ipc (VSOCK) */
86: caddr_t vu_vmdata; /* private data for vm (VREG) */
87: struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */
88: struct fifoinfo *vu_fifoinfo; /* fifo (VFIFO) */
89: } v_un;
90: enum vtagtype v_tag; /* type of underlying data */
91: char v_data[VN_MAXPRIVATE]; /* private data for fs */
92: };
93: #define v_mountedhere v_un.vu_mountedhere
94: #define v_socket v_un.vu_socket
95: #define v_vmdata v_un.vu_vmdata
96: #define v_specinfo v_un.vu_specinfo
97: #define v_fifoinfo v_un.vu_fifoinfo
98:
99: /*
100: * vnode flags.
101: */
102: #define VROOT 0x0001 /* root of its file system */
103: #define VTEXT 0x0002 /* vnode is a pure text prototype */
104: #define VSYSTEM 0x0004 /* vnode being used by kernel */
105: #define VXLOCK 0x0100 /* vnode is locked to change underlying type */
106: #define VXWANT 0x0200 /* process is waiting for vnode */
107: #define VBWAIT 0x0400 /* waiting for output to complete */
108: #define VALIASED 0x0800 /* vnode has an alias */
109:
110: /*
111: * Vnode attributes. A field value of VNOVAL
112: * represents a field whose value is unavailable
113: * (getattr) or which is not to be changed (setattr).
114: */
115: struct vattr {
116: enum vtype va_type; /* vnode type (for create) */
117: u_short va_mode; /* files access mode and type */
118: short va_nlink; /* number of references to file */
119: uid_t va_uid; /* owner user id */
120: gid_t va_gid; /* owner group id */
121: long va_fsid; /* file system id (dev for now) */
122: long va_fileid; /* file id */
123: u_quad va_qsize; /* file size in bytes */
124: long va_blocksize; /* blocksize preferred for i/o */
125: struct timeval va_atime; /* time of last access */
126: struct timeval va_mtime; /* time of last modification */
127: struct timeval va_ctime; /* time file changed */
128: u_long va_gen; /* generation number of file */
129: u_long va_flags; /* flags defined for file */
130: dev_t va_rdev; /* device the special file represents */
131: u_quad va_qbytes; /* bytes of disk space held by file */
132: };
133: #if BYTE_ORDER == LITTLE_ENDIAN
134: #define va_size va_qsize.val[0]
135: #define va_size_rsv va_qsize.val[1]
136: #define va_bytes va_qbytes.val[0]
137: #define va_bytes_rsv va_qbytes.val[1]
138: #else
139: #define va_size va_qsize.val[1]
140: #define va_size_rsv va_qsize.val[0]
141: #define va_bytes va_qbytes.val[1]
142: #define va_bytes_rsv va_qbytes.val[0]
143: #endif
144:
145: /*
146: * Operations on vnodes.
147: */
148: #ifdef __STDC__
149: struct flock;
150: struct nameidata;
151: #endif
152:
153: struct vnodeops {
154: int (*vop_lookup) __P((struct vnode *vp, struct nameidata *ndp,
155: struct proc *p));
156: int (*vop_create) __P((struct nameidata *ndp, struct vattr *vap,
157: struct proc *p));
158: int (*vop_mknod) __P((struct nameidata *ndp, struct vattr *vap,
159: struct ucred *cred, struct proc *p));
160: int (*vop_open) __P((struct vnode *vp, int mode,
161: struct ucred *cred, struct proc *p));
162: int (*vop_close) __P((struct vnode *vp, int fflag,
163: struct ucred *cred, struct proc *p));
164: int (*vop_access) __P((struct vnode *vp, int mode,
165: struct ucred *cred, struct proc *p));
166: int (*vop_getattr) __P((struct vnode *vp, struct vattr *vap,
167: struct ucred *cred, struct proc *p));
168: int (*vop_setattr) __P((struct vnode *vp, struct vattr *vap,
169: struct ucred *cred, struct proc *p));
170: int (*vop_read) __P((struct vnode *vp, struct uio *uio,
171: int ioflag, struct ucred *cred));
172: int (*vop_write) __P((struct vnode *vp, struct uio *uio,
173: int ioflag, struct ucred *cred));
174: int (*vop_ioctl) __P((struct vnode *vp, int command,
175: caddr_t data, int fflag,
176: struct ucred *cred, struct proc *p));
177: int (*vop_select) __P((struct vnode *vp, int which, int fflags,
178: struct ucred *cred, struct proc *p));
179: int (*vop_mmap) __P((struct vnode *vp, int fflags,
180: struct ucred *cred, struct proc *p));
181: int (*vop_fsync) __P((struct vnode *vp, int fflags,
182: struct ucred *cred, int waitfor,
183: struct proc *p));
184: int (*vop_seek) __P((struct vnode *vp, off_t oldoff,
185: off_t newoff, struct ucred *cred));
186: int (*vop_remove) __P((struct nameidata *ndp, struct proc *p));
187: int (*vop_link) __P((struct vnode *vp, struct nameidata *ndp,
188: struct proc *p));
189: int (*vop_rename) __P((struct nameidata *fndp,
190: struct nameidata *tdnp, struct proc *p));
191: int (*vop_mkdir) __P((struct nameidata *ndp, struct vattr *vap,
192: struct proc *p));
193: int (*vop_rmdir) __P((struct nameidata *ndp, struct proc *p));
194: int (*vop_symlink) __P((struct nameidata *ndp, struct vattr *vap,
195: char *target, struct proc *p));
196: int (*vop_readdir) __P((struct vnode *vp, struct uio *uio,
197: struct ucred *cred, int *eofflagp));
198: int (*vop_readlink) __P((struct vnode *vp, struct uio *uio,
199: struct ucred *cred));
200: int (*vop_abortop) __P((struct nameidata *ndp));
201: int (*vop_inactive) __P((struct vnode *vp, struct proc *p));
202: int (*vop_reclaim) __P((struct vnode *vp));
203: int (*vop_lock) __P((struct vnode *vp));
204: int (*vop_unlock) __P((struct vnode *vp));
205: int (*vop_bmap) __P((struct vnode *vp, daddr_t bn,
206: struct vnode **vpp, daddr_t *bnp));
207: int (*vop_strategy) __P((struct buf *bp));
208: int (*vop_print) __P((struct vnode *vp));
209: int (*vop_islocked) __P((struct vnode *vp));
210: int (*vop_advlock) __P((struct vnode *vp, caddr_t id, int op,
211: struct flock *fl, int flags));
212: };
213:
214: /* Macros to call the vnode ops */
215: #define VOP_LOOKUP(v,n,p) (*((v)->v_op->vop_lookup))(v,n,p)
216: #define VOP_CREATE(n,a,p) (*((n)->ni_dvp->v_op->vop_create))(n,a,p)
217: #define VOP_MKNOD(n,a,c,p) (*((n)->ni_dvp->v_op->vop_mknod))(n,a,c,p)
218: #define VOP_OPEN(v,f,c,p) (*((v)->v_op->vop_open))(v,f,c,p)
219: #define VOP_CLOSE(v,f,c,p) (*((v)->v_op->vop_close))(v,f,c,p)
220: #define VOP_ACCESS(v,f,c,p) (*((v)->v_op->vop_access))(v,f,c,p)
221: #define VOP_GETATTR(v,a,c,p) (*((v)->v_op->vop_getattr))(v,a,c,p)
222: #define VOP_SETATTR(v,a,c,p) (*((v)->v_op->vop_setattr))(v,a,c,p)
223: #define VOP_READ(v,u,i,c) (*((v)->v_op->vop_read))(v,u,i,c)
224: #define VOP_WRITE(v,u,i,c) (*((v)->v_op->vop_write))(v,u,i,c)
225: #define VOP_IOCTL(v,o,d,f,c,p) (*((v)->v_op->vop_ioctl))(v,o,d,f,c,p)
226: #define VOP_SELECT(v,w,f,c,p) (*((v)->v_op->vop_select))(v,w,f,c,p)
227: #define VOP_MMAP(v,c,p) (*((v)->v_op->vop_mmap))(v,c,p)
228: #define VOP_FSYNC(v,f,c,w,p) (*((v)->v_op->vop_fsync))(v,f,c,w,p)
229: #define VOP_SEEK(v,p,o,w) (*((v)->v_op->vop_seek))(v,p,o,w)
230: #define VOP_REMOVE(n,p) (*((n)->ni_dvp->v_op->vop_remove))(n,p)
231: #define VOP_LINK(v,n,p) (*((n)->ni_dvp->v_op->vop_link))(v,n,p)
232: #define VOP_RENAME(s,t,p) (*((s)->ni_dvp->v_op->vop_rename))(s,t,p)
233: #define VOP_MKDIR(n,a,p) (*((n)->ni_dvp->v_op->vop_mkdir))(n,a,p)
234: #define VOP_RMDIR(n,p) (*((n)->ni_dvp->v_op->vop_rmdir))(n,p)
235: #define VOP_SYMLINK(n,a,m,p) (*((n)->ni_dvp->v_op->vop_symlink))(n,a,m,p)
236: #define VOP_READDIR(v,u,c,e) (*((v)->v_op->vop_readdir))(v,u,c,e)
237: #define VOP_READLINK(v,u,c) (*((v)->v_op->vop_readlink))(v,u,c)
238: #define VOP_ABORTOP(n) (*((n)->ni_dvp->v_op->vop_abortop))(n)
239: #define VOP_INACTIVE(v,p) (*((v)->v_op->vop_inactive))(v,p)
240: #define VOP_RECLAIM(v) (*((v)->v_op->vop_reclaim))(v)
241: #define VOP_LOCK(v) (*((v)->v_op->vop_lock))(v)
242: #define VOP_UNLOCK(v) (*((v)->v_op->vop_unlock))(v)
243: #define VOP_BMAP(v,s,p,n) (*((v)->v_op->vop_bmap))(v,s,p,n)
244: #define VOP_STRATEGY(b) (*((b)->b_vp->v_op->vop_strategy))(b)
245: #define VOP_PRINT(v) (*((v)->v_op->vop_print))(v)
246: #define VOP_ISLOCKED(v) (((v)->v_flag & VXLOCK) || \
247: (*((v)->v_op->vop_islocked))(v))
248: #define VOP_ADVLOCK(v,p,o,l,f) (*((v)->v_op->vop_advlock))(v,p,o,l,f)
249:
250: /*
251: * flags for ioflag
252: */
253: #define IO_UNIT 0x01 /* do I/O as atomic unit */
254: #define IO_APPEND 0x02 /* append write to end */
255: #define IO_SYNC 0x04 /* do I/O synchronously */
256: #define IO_NODELOCKED 0x08 /* underlying node already locked */
257: #define IO_NDELAY 0x10 /* FNDELAY flag set in file table */
258:
259: /*
260: * Modes. Some values same as Ixxx entries from inode.h for now
261: */
262: #define VSUID 04000 /* set user id on execution */
263: #define VSGID 02000 /* set group id on execution */
264: #define VSVTX 01000 /* save swapped text even after use */
265: #define VREAD 0400 /* read, write, execute permissions */
266: #define VWRITE 0200
267: #define VEXEC 0100
268:
269: /*
270: * Token indicating no attribute value yet assigned
271: */
272: #define VNOVAL ((unsigned)0xffffffff)
273:
274: #ifdef KERNEL
275: /*
276: * public vnode manipulation functions
277: */
278: int vn_open __P((struct nameidata *ndp, struct proc *p, int fmode,
279: int cmode));
280: int vn_close __P((struct vnode *vp, int flags, struct ucred *cred,
281: struct proc *p));
282: int vn_rdwr __P((enum uio_rw rw, struct vnode *vp, caddr_t base,
283: int len, off_t offset, enum uio_seg segflg, int ioflg,
284: struct ucred *cred, int *aresid, struct proc *p));
285: int vn_read __P((struct file *fp, struct uio *uio, struct ucred *cred));
286: int vn_write __P((struct file *fp, struct uio *uio, struct ucred *cred));
287: int vn_ioctl __P((struct file *fp, int com, caddr_t data, struct proc *p));
288: int vn_select __P((struct file *fp, int which, struct proc *p));
289: int vn_closefile __P((struct file *fp, struct proc *p));
290: int getnewvnode __P((enum vtagtype tag, struct mount *mp,
291: struct vnodeops *vops, struct vnode **vpp));
292: int bdevvp __P((int dev, struct vnode **vpp));
293: /* check for special device aliases */
294: /* XXX nvp_rdev should be type dev_t, not int */
295: struct vnode *checkalias __P((struct vnode *vp, int nvp_rdev,
296: struct mount *mp));
297: void vattr_null __P((struct vattr *vap));
298: int vcount __P((struct vnode *vp)); /* total references to a device */
299: int vget __P((struct vnode *vp)); /* get first reference to a vnode */
300: void vref __P((struct vnode *vp)); /* increase reference to a vnode */
301: void vput __P((struct vnode *vp)); /* unlock and release vnode */
302: void vrele __P((struct vnode *vp)); /* release vnode */
303: void vgone __P((struct vnode *vp)); /* completely recycle vnode */
304: void vgoneall __P((struct vnode *vp));/* recycle vnode and all its aliases */
305:
306: /*
307: * Flags to various vnode functions.
308: */
309: #define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */
310: #define FORCECLOSE 0x0002 /* vflush: force file closeure */
311: #define DOCLOSE 0x0004 /* vclean: close active files */
312:
313: #ifndef DIAGNOSTIC
314: #define VREF(vp) (vp)->v_usecount++ /* increase reference */
315: #define VHOLD(vp) (vp)->v_holdcnt++ /* increase buf or page ref */
316: #define HOLDRELE(vp) (vp)->v_holdcnt-- /* decrease buf or page ref */
317: #define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */
318: #else /* DIAGNOSTIC */
319: #define VREF(vp) vref(vp)
320: #define VHOLD(vp) vhold(vp)
321: #define HOLDRELE(vp) holdrele(vp)
322: #define VATTR_NULL(vap) vattr_null(vap)
323: #endif
324:
325: #define NULLVP ((struct vnode *)NULL)
326:
327: /*
328: * Global vnode data.
329: */
330: extern struct vnode *rootdir; /* root (i.e. "/") vnode */
331: extern long desiredvnodes; /* number of vnodes desired */
332: extern struct vattr va_null; /* predefined null vattr structure */
333: #endif
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