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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*
27: * Copyright (c) 1989, 1993
28: * The Regents of the University of California. All rights reserved.
29: *
30: * Redistribution and use in source and binary forms, with or without
31: * modification, are permitted provided that the following conditions
32: * are met:
33: * 1. Redistributions of source code must retain the above copyright
34: * notice, this list of conditions and the following disclaimer.
35: * 2. Redistributions in binary form must reproduce the above copyright
36: * notice, this list of conditions and the following disclaimer in the
37: * documentation and/or other materials provided with the distribution.
38: * 3. All advertising materials mentioning features or use of this software
39: * must display the following acknowledgement:
40: * This product includes software developed by the University of
41: * California, Berkeley and its contributors.
42: * 4. Neither the name of the University nor the names of its contributors
43: * may be used to endorse or promote products derived from this software
44: * without specific prior written permission.
45: *
46: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56: * SUCH DAMAGE.
57: *
58: * @(#)vnode.h 8.17 (Berkeley) 5/20/95
59: */
60:
61: #ifndef _VNODE_H_
62: #define _VNODE_H_
63:
64: #include <sys/cdefs.h>
65: #include <sys/queue.h>
66: #include <sys/lock.h>
67:
68: #include <sys/time.h>
69: #include <sys/uio.h>
70:
71: #include <sys/vm.h>
72:
73: /*
74: * The vnode is the focus of all file activity in UNIX. There is a
75: * unique vnode allocated for each active file, each current directory,
76: * each mounted-on file, text file, and the root.
77: */
78:
79: /*
80: * Vnode types. VNON means no type.
81: */
82: enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD, VSTR,
83: VCPLX };
84:
85: /*
86: * Vnode tag types.
87: * These are for the benefit of external programs only (e.g., pstat)
88: * and should NEVER be inspected by the kernel.
89: */
90: enum vtagtype {
91: VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_MSDOSFS, VT_LFS, VT_LOFS, VT_FDESC,
92: VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS, VT_AFS, VT_ISOFS,
93: VT_UNION, VT_HFS, VT_VOLFS, VT_OTHER};
94:
95: /*
96: * Each underlying filesystem allocates its own private area and hangs
97: * it from v_data. If non-null, this area is freed in getnewvnode().
98: */
99: LIST_HEAD(buflists, buf);
100:
101: /*
102: * Reading or writing any of these items requires holding the appropriate lock.
103: * v_freelist is locked by the global vnode_free_list simple lock.
104: * v_mntvnodes is locked by the global mntvnodes simple lock.
105: * v_flag, v_usecount, v_holdcount and v_writecount are
106: * locked by the v_interlock simple lock.
107: */
108: struct vnode {
109: u_long v_flag; /* vnode flags (see below) */
110: short v_usecount; /* reference count of users */
111: short v_writecount; /* reference count of writers */
112: long v_holdcnt; /* page & buffer references */
113: daddr_t v_lastr; /* last read (read-ahead) */
114: u_long v_id; /* capability identifier */
115: struct mount *v_mount; /* ptr to vfs we are in */
116: int (**v_op)(); /* vnode operations vector */
117: TAILQ_ENTRY(vnode) v_freelist; /* vnode freelist */
118: LIST_ENTRY(vnode) v_mntvnodes; /* vnodes for mount point */
119: struct buflists v_cleanblkhd; /* clean blocklist head */
120: struct buflists v_dirtyblkhd; /* dirty blocklist head */
121: long v_numoutput; /* num of writes in progress */
122: enum vtype v_type; /* vnode type */
123: union {
124: struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
125: struct socket *vu_socket; /* unix ipc (VSOCK) */
126: struct vm_info *vu_vm_info; /* private data for vm (VREG) */
127: struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */
128: struct fifoinfo *vu_fifoinfo; /* fifo (VFIFO) */
129: } v_un;
130: struct nqlease *v_lease; /* Soft reference to lease */
131: daddr_t v_lastw; /* last write (write cluster) */
132: daddr_t v_cstart; /* start block of cluster */
133: daddr_t v_lasta; /* last allocation */
134: int v_clen; /* length of current cluster */
135: int v_ralen; /* Read-ahead length */
136: daddr_t v_maxra; /* last readahead block */
137: simple_lock_data_t v_interlock; /* lock on usecount and flag */
138: struct lock__bsd__ *v_vnlock; /* used for non-locking fs's */
139: long v_spare[5]; /* round to 128 bytes */
140: enum vtagtype v_tag; /* type of underlying data */
141: void *v_data; /* private data for fs */
142: u_long v_bread;
143: u_long v_consumed;
144: u_long v_trigger;
145: int v_power;
146: };
147: #define v_mountedhere v_un.vu_mountedhere
148: #define v_socket v_un.vu_socket
149: #define v_vm_info v_un.vu_vm_info
150: #define v_specinfo v_un.vu_specinfo
151: #define v_fifoinfo v_un.vu_fifoinfo
152:
153: /*
154: * Vnode flags.
155: */
156: #define VROOT 0x0001 /* root of its file system */
157: #define VTEXT 0x0002 /* vnode is a pure text prototype */
158: #define VSYSTEM 0x0004 /* vnode being used by kernel */
159: #define VISTTY 0x0008 /* vnode represents a tty */
160: #define VXLOCK 0x0100 /* vnode is locked to change underlying type */
161: #define VXWANT 0x0200 /* process is waiting for vnode */
162: #define VBWAIT 0x0400 /* waiting for output to complete */
163: #define VALIASED 0x0800 /* vnode has an alias */
164: #define VDIROP 0x1000 /* LFS: vnode is involved in a directory op */
165: #define VAGE 0x8000 /* Insert vnode at head of free list */
166: #define VRAOFF 0x10000 /* read ahead disabled */
167:
168: /*
169: * Vnode attributes. A field value of VNOVAL represents a field whose value
170: * is unavailable (getattr) or which is not to be changed (setattr).
171: */
172: struct vattr {
173: enum vtype va_type; /* vnode type (for create) */
174: u_short va_mode; /* files access mode and type */
175: short va_nlink; /* number of references to file */
176: uid_t va_uid; /* owner user id */
177: gid_t va_gid; /* owner group id */
178: long va_fsid; /* file system id (dev for now) */
179: long va_fileid; /* file id */
180: u_quad_t va_size; /* file size in bytes */
181: long va_blocksize; /* blocksize preferred for i/o */
182: struct timespec va_atime; /* time of last access */
183: struct timespec va_mtime; /* time of last modification */
184: struct timespec va_ctime; /* time file changed */
185: u_long va_gen; /* generation number of file */
186: u_long va_flags; /* flags defined for file */
187: dev_t va_rdev; /* device the special file represents */
188: u_quad_t va_bytes; /* bytes of disk space held by file */
189: u_quad_t va_filerev; /* file modification number */
190: u_int va_vaflags; /* operations flags, see below */
191: long va_spare; /* remain quad aligned */
192: };
193:
194: /*
195: * Flags for va_vaflags.
196: */
197: #define VA_UTIMES_NULL 0x01 /* utimes argument was NULL */
198: #define VA_EXCLUSIVE 0x02 /* exclusive create request */
199:
200: /*
201: * Flags for ioflag.
202: */
203: #define IO_UNIT 0x01 /* do I/O as atomic unit */
204: #define IO_APPEND 0x02 /* append write to end */
205: #define IO_SYNC 0x04 /* do I/O synchronously */
206: #define IO_NODELOCKED 0x08 /* underlying node already locked */
207: #define IO_NDELAY 0x10 /* FNDELAY flag set in file table */
208: #define IO_NOZEROFILL 0x20 /* F_SETSIZE fcntl uses to prevent zero filling */
209:
210: /*
211: * Modes. Some values same as Ixxx entries from inode.h for now.
212: */
213: #define VSUID 04000 /* set user id on execution */
214: #define VSGID 02000 /* set group id on execution */
215: #define VSVTX 01000 /* save swapped text even after use */
216: #define VREAD 00400 /* read, write, execute permissions */
217: #define VWRITE 00200
218: #define VEXEC 00100
219:
220: /*
221: * Token indicating no attribute value yet assigned.
222: */
223: #define VNOVAL (-1)
224:
225: #ifdef _KERNEL
226: /*
227: * Convert between vnode types and inode formats (since POSIX.1
228: * defines mode word of stat structure in terms of inode formats).
229: */
230: extern enum vtype iftovt_tab[];
231: extern int vttoif_tab[];
232: #define IFTOVT(mode) (iftovt_tab[((mode) & S_IFMT) >> 12])
233: #define VTTOIF(indx) (vttoif_tab[(int)(indx)])
234: #define MAKEIMODE(indx, mode) (int)(VTTOIF(indx) | (mode))
235:
236: /*
237: * Flags to various vnode functions.
238: */
239: #define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */
240: #define FORCECLOSE 0x0002 /* vflush: force file closeure */
241: #define WRITECLOSE 0x0004 /* vflush: only close writeable files */
242: #define DOCLOSE 0x0008 /* vclean: close active files */
243: #define V_SAVE 0x0001 /* vinvalbuf: sync file first */
244: #define V_SAVEMETA 0x0002 /* vinvalbuf: leave indirect blocks */
245: #define REVOKEALL 0x0001 /* vop_revoke: revoke all aliases */
246: #define PREALLOCATE 0x00000001 /* vop_allocate: preallocate allocation blocks */
247: #define ALLOCATECONTIG 0x00000002 /* vop_allocate: allocate contigious space */
248: #define ALLOCATEALL 0x00000004 /* vop_allocate: allocate all requested space or no space at all */
249: #define FREEREMAINDER 0x00000008 /* vop_allcoate: deallocate allocated but unfilled blocks */
250: #define ALLOCATEFROMPEOF 0x00000010 /* vop_allocate: allocate from the physical eof */
251:
252:
253:
254: #if DIAGNOSTIC
255: #define HOLDRELE(vp) holdrele(vp)
256: #define VATTR_NULL(vap) vattr_null(vap)
257: #define VHOLD(vp) vhold(vp)
258: #define VREF(vp) vref(vp)
259:
260: void holdrele __P((struct vnode *));
261: void vattr_null __P((struct vattr *));
262: void vhold __P((struct vnode *));
263: void vref __P((struct vnode *));
264: #else
265: #define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */
266: #define HOLDRELE(vp) holdrele(vp) /* decrease buf or page ref */
267: extern __inline void holdrele(vp)
268: struct vnode *vp;
269: {
270: simple_lock(&vp->v_interlock);
271: vp->v_holdcnt--;
272: simple_unlock(&vp->v_interlock);
273: }
274: #define VHOLD(vp) vhold(vp) /* increase buf or page ref */
275: extern __inline void vhold(vp)
276: struct vnode *vp;
277: {
278: simple_lock(&vp->v_interlock);
1.1.1.2 ! root 279: if (++vp->v_holdcnt <= 0)
! 280: panic("vhold: v_holdcnt");
1.1 root 281: simple_unlock(&vp->v_interlock);
282: }
283: #define VREF(vp) vref(vp) /* increase reference */
284: extern __inline void vref(vp)
285: struct vnode *vp;
286: {
287: simple_lock(&vp->v_interlock);
1.1.1.2 ! root 288: if (++vp->v_usecount <= 0)
! 289: panic("vref: v_usecount");
1.1 root 290: simple_unlock(&vp->v_interlock);
291: }
292: #endif /* DIAGNOSTIC */
293:
294: #define NULLVP ((struct vnode *)NULL)
295:
296: /*
297: * Global vnode data.
298: */
299: extern struct vnode *rootvnode; /* root (i.e. "/") vnode */
300: extern int desiredvnodes; /* number of vnodes desired */
301: extern struct vattr va_null; /* predefined null vattr structure */
302:
303: /*
304: * Macro/function to check for client cache inconsistency w.r.t. leasing.
305: */
306: #define LEASE_READ 0x1 /* Check lease for readers */
307: #define LEASE_WRITE 0x2 /* Check lease for modifiers */
308:
309: #endif /* _KERNEL */
310:
311:
312: /*
313: * Mods for exensibility.
314: */
315:
316: /*
317: * Flags for vdesc_flags:
318: */
319: #define VDESC_MAX_VPS 16
320: /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
321: #define VDESC_VP0_WILLRELE 0x0001
322: #define VDESC_VP1_WILLRELE 0x0002
323: #define VDESC_VP2_WILLRELE 0x0004
324: #define VDESC_VP3_WILLRELE 0x0008
325: #define VDESC_NOMAP_VPP 0x0100
326: #define VDESC_VPP_WILLRELE 0x0200
327:
328: /*
329: * VDESC_NO_OFFSET is used to identify the end of the offset list
330: * and in places where no such field exists.
331: */
332: #define VDESC_NO_OFFSET -1
333:
334: /*
335: * This structure describes the vnode operation taking place.
336: */
337: struct vnodeop_desc {
338: int vdesc_offset; /* offset in vector--first for speed */
339: char *vdesc_name; /* a readable name for debugging */
340: int vdesc_flags; /* VDESC_* flags */
341:
342: /*
343: * These ops are used by bypass routines to map and locate arguments.
344: * Creds and procs are not needed in bypass routines, but sometimes
345: * they are useful to (for example) transport layers.
346: * Nameidata is useful because it has a cred in it.
347: */
348: int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */
349: int vdesc_vpp_offset; /* return vpp location */
350: int vdesc_cred_offset; /* cred location, if any */
351: int vdesc_proc_offset; /* proc location, if any */
352: int vdesc_componentname_offset; /* if any */
353: /*
354: * Finally, we've got a list of private data (about each operation)
355: * for each transport layer. (Support to manage this list is not
356: * yet part of BSD.)
357: */
358: caddr_t *vdesc_transports;
359: };
360:
361: #ifdef _KERNEL
362: /*
363: * A list of all the operation descs.
364: */
365: extern struct vnodeop_desc *vnodeop_descs[];
366:
367: /*
368: * Interlock for scanning list of vnodes attached to a mountpoint
369: */
370: extern struct slock mntvnode_slock;
371:
372: /*
373: * This macro is very helpful in defining those offsets in the vdesc struct.
374: *
375: * This is stolen from X11R4. I ingored all the fancy stuff for
376: * Crays, so if you decide to port this to such a serious machine,
377: * you might want to consult Intrisics.h's XtOffset{,Of,To}.
378: */
379: #define VOPARG_OFFSET(p_type,field) \
380: ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
381: #define VOPARG_OFFSETOF(s_type,field) \
382: VOPARG_OFFSET(s_type*,field)
383: #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
384: ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
385:
386:
387: /*
388: * This structure is used to configure the new vnodeops vector.
389: */
390: struct vnodeopv_entry_desc {
391: struct vnodeop_desc *opve_op; /* which operation this is */
392: int (*opve_impl)(); /* code implementing this operation */
393: };
394: struct vnodeopv_desc {
395: /* ptr to the ptr to the vector where op should go */
396: int (***opv_desc_vector_p)();
397: struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */
398: };
399:
400: /*
401: * A default routine which just returns an error.
402: */
403: int vn_default_error __P((void));
404:
405: /*
406: * A generic structure.
407: * This can be used by bypass routines to identify generic arguments.
408: */
409: struct vop_generic_args {
410: struct vnodeop_desc *a_desc;
411: /* other random data follows, presumably */
412: };
413:
414: /*
415: * VOCALL calls an op given an ops vector. We break it out because BSD's
416: * vclean changes the ops vector and then wants to call ops with the old
417: * vector.
418: */
419: #define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP))
420:
421: /*
422: * This call works for vnodes in the kernel.
423: */
424: #define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP))
425: #define VDESC(OP) (& __CONCAT(OP,_desc))
426: #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
427:
428: /*
429: * Finally, include the default set of vnode operations.
430: */
431: #include <sys/vnode_if.h>
432:
433: /*
434: * Public vnode manipulation functions.
435: */
436: struct file;
437: struct mount;
438: struct nameidata;
439: struct ostat;
440: struct proc;
441: struct stat;
442: struct ucred;
443: struct uio;
444: struct vattr;
445: struct vnode;
446: struct vop_bwrite_args;
447:
448: int bdevvp __P((dev_t dev, struct vnode **vpp));
449: void cvtstat __P((struct stat *st, struct ostat *ost));
450: int getnewvnode __P((enum vtagtype tag,
451: struct mount *mp, int (**vops)(), struct vnode **vpp));
452: void insmntque __P((struct vnode *vp, struct mount *mp));
453: void vattr_null __P((struct vattr *vap));
454: int vcount __P((struct vnode *vp));
455: int vflush __P((struct mount *mp, struct vnode *skipvp, int flags));
456: int vget __P((struct vnode *vp, int lockflag, struct proc *p));
457: void vgone __P((struct vnode *vp));
458: int vinvalbuf __P((struct vnode *vp, int save, struct ucred *cred,
459: struct proc *p, int slpflag, int slptimeo));
460: void vprint __P((char *label, struct vnode *vp));
461: int vrecycle __P((struct vnode *vp, struct slock *inter_lkp,
462: struct proc *p));
463: int vn_bwrite __P((struct vop_bwrite_args *ap));
464: int vn_close __P((struct vnode *vp,
465: int flags, struct ucred *cred, struct proc *p));
466: int vn_closefile __P((struct file *fp, struct proc *p));
467: int vn_ioctl __P((struct file *fp, u_long com, caddr_t data,
468: struct proc *p));
469: int vn_lock __P((struct vnode *vp, int flags, struct proc *p));
470: int vn_open __P((struct nameidata *ndp, int fmode, int cmode));
471: int vn_rdwr __P((enum uio_rw rw, struct vnode *vp, caddr_t base,
472: int len, off_t offset, enum uio_seg segflg, int ioflg,
473: struct ucred *cred, int *aresid, struct proc *p));
474: int vn_read __P((struct file *fp, struct uio *uio, struct ucred *cred));
475: int vn_select __P((struct file *fp, int which, struct proc *p));
476: int vn_stat __P((struct vnode *vp, struct stat *sb, struct proc *p));
477: int vn_write __P((struct file *fp, struct uio *uio, struct ucred *cred));
478: int vop_noislocked __P((struct vop_islocked_args *));
479: int vop_nolock __P((struct vop_lock_args *));
480: int vop_nounlock __P((struct vop_unlock_args *));
481: int vop_revoke __P((struct vop_revoke_args *));
482: struct vnode *
483: checkalias __P((struct vnode *vp, dev_t nvp_rdev, struct mount *mp));
484: void vput __P((struct vnode *vp));
485: void vrele __P((struct vnode *vp));
486: int vaccess __P((mode_t file_mode, uid_t uid, gid_t gid,
487: mode_t acc_mode, struct ucred *cred));
488: int getvnode __P((struct proc *p, int fd, struct file **fpp));
489:
490: #endif /* _KERNEL */
491:
492: #endif /* !_VNODE_H_ */
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