vnode.h revision 141448
1/*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)vnode.h 8.7 (Berkeley) 2/4/94 30 * $FreeBSD: head/sys/sys/vnode.h 141448 2005-02-07 09:26:39Z phk $ 31 */ 32 33#ifndef _SYS_VNODE_H_ 34#define _SYS_VNODE_H_ 35 36/* 37 * XXX - compatability until lockmgr() goes away or all the #includes are 38 * updated. 39 */ 40#include <sys/lockmgr.h> 41 42#include <sys/bufobj.h> 43#include <sys/queue.h> 44#include <sys/_lock.h> 45#include <sys/lock.h> 46#include <sys/_mutex.h> 47#include <sys/mutex.h> 48#include <sys/selinfo.h> 49#include <sys/uio.h> 50#include <sys/acl.h> 51#include <sys/ktr.h> 52 53/* 54 * The vnode is the focus of all file activity in UNIX. There is a 55 * unique vnode allocated for each active file, each current directory, 56 * each mounted-on file, text file, and the root. 57 */ 58 59/* 60 * Vnode types. VNON means no type. 61 */ 62enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD }; 63 64/* 65 * Each underlying filesystem allocates its own private area and hangs 66 * it from v_data. If non-null, this area is freed in getnewvnode(). 67 */ 68 69struct namecache; 70 71struct vpollinfo { 72 struct mtx vpi_lock; /* lock to protect below */ 73 struct selinfo vpi_selinfo; /* identity of poller(s) */ 74 short vpi_events; /* what they are looking for */ 75 short vpi_revents; /* what has happened */ 76}; 77 78/* 79 * Reading or writing any of these items requires holding the appropriate lock. 80 * 81 * Lock reference: 82 * c - namecache mutex 83 * f - freelist mutex 84 * G - Giant 85 * i - interlock 86 * m - mntvnodes mutex 87 * p - pollinfo lock 88 * s - spechash mutex 89 * S - syncer mutex 90 * u - Only a reference to the vnode is needed to read. 91 * v - vnode lock 92 * 93 * Vnodes may be found on many lists. The general way to deal with operating 94 * on a vnode that is on a list is: 95 * 1) Lock the list and find the vnode. 96 * 2) Lock interlock so that the vnode does not go away. 97 * 3) Unlock the list to avoid lock order reversals. 98 * 4) vget with LK_INTERLOCK and check for ENOENT, or 99 * 5) Check for XLOCK if the vnode lock is not required. 100 * 6) Perform your operation, then vput(). 101 * 102 * XXX Not all fields are locked yet and some fields that are marked are not 103 * locked consistently. This is a work in progress. Requires Giant! 104 */ 105 106#if defined(_KERNEL) || defined(_KVM_VNODE) 107 108struct vnode { 109 struct mtx v_interlock; /* lock for "i" things */ 110 u_long v_iflag; /* i vnode flags (see below) */ 111 int v_usecount; /* i ref count of users */ 112 struct thread *v_vxthread; /* i thread owning VXLOCK */ 113 int v_holdcnt; /* i page & buffer references */ 114 struct bufobj v_bufobj; /* * Buffer cache object */ 115 u_long v_vflag; /* v vnode flags */ 116 int v_writecount; /* v ref count of writers */ 117 daddr_t v_lastw; /* v last write (write cluster) */ 118 daddr_t v_cstart; /* v start block of cluster */ 119 daddr_t v_lasta; /* v last allocation (cluster) */ 120 int v_clen; /* v length of current cluster */ 121 union { 122 struct mount *vu_mountedhere;/* v ptr to mounted vfs (VDIR) */ 123 struct socket *vu_socket; /* v unix ipc (VSOCK) */ 124 struct { 125 struct cdev *vu_cdev; /* v device (VCHR, VBLK) */ 126 SLIST_ENTRY(vnode) vu_specnext; /* s device aliases */ 127 } vu_spec; 128 struct fifoinfo *vu_fifoinfo; /* v fifo (VFIFO) */ 129 } v_un; 130 TAILQ_ENTRY(vnode) v_freelist; /* f vnode freelist */ 131 TAILQ_ENTRY(vnode) v_nmntvnodes; /* m vnodes for mount point */ 132 enum vtype v_type; /* u vnode type */ 133 const char *v_tag; /* u type of underlying data */ 134 void *v_data; /* u private data for fs */ 135 struct lock v_lock; /* u used if fs don't have one */ 136 struct lock *v_vnlock; /* u pointer to vnode lock */ 137 struct vop_vector *v_op; /* u vnode operations vector */ 138 struct mount *v_mount; /* u ptr to vfs we are in */ 139 LIST_HEAD(, namecache) v_cache_src; /* c Cache entries from us */ 140 TAILQ_HEAD(, namecache) v_cache_dst; /* c Cache entries to us */ 141 u_long v_id; /* c capability identifier */ 142 struct vnode *v_dd; /* c .. vnode */ 143 u_long v_ddid; /* c .. capability identifier */ 144 struct vpollinfo *v_pollinfo; /* G Poll events, p for *v_pi */ 145 struct label *v_label; /* MAC label for vnode */ 146#ifdef DEBUG_LOCKS 147 const char *filename; /* Source file doing locking */ 148 int line; /* Line number doing locking */ 149#endif 150}; 151 152#endif /* defined(_KERNEL) || defined(_KVM_VNODE) */ 153 154#define v_mountedhere v_un.vu_mountedhere 155#define v_socket v_un.vu_socket 156#define v_rdev v_un.vu_spec.vu_cdev 157#define v_specnext v_un.vu_spec.vu_specnext 158#define v_fifoinfo v_un.vu_fifoinfo 159 160/* XXX: These are temporary to avoid a source sweep at this time */ 161#define v_object v_bufobj.bo_object 162 163/* 164 * Userland version of struct vnode, for sysctl. 165 */ 166struct xvnode { 167 size_t xv_size; /* sizeof(struct xvnode) */ 168 void *xv_vnode; /* address of real vnode */ 169 u_long xv_flag; /* vnode vflags */ 170 int xv_usecount; /* reference count of users */ 171 int xv_writecount; /* reference count of writers */ 172 int xv_holdcnt; /* page & buffer references */ 173 u_long xv_id; /* capability identifier */ 174 void *xv_mount; /* address of parent mount */ 175 long xv_numoutput; /* num of writes in progress */ 176 enum vtype xv_type; /* vnode type */ 177 union { 178 void *xvu_socket; /* socket, if VSOCK */ 179 void *xvu_fifo; /* fifo, if VFIFO */ 180 dev_t xvu_rdev; /* maj/min, if VBLK/VCHR */ 181 struct { 182 dev_t xvu_dev; /* device, if VDIR/VREG/VLNK */ 183 ino_t xvu_ino; /* id, if VDIR/VREG/VLNK */ 184 } xv_uns; 185 } xv_un; 186}; 187#define xv_socket xv_un.xvu_socket 188#define xv_fifo xv_un.xvu_fifo 189#define xv_rdev xv_un.xvu_rdev 190#define xv_dev xv_un.xv_uns.xvu_dev 191#define xv_ino xv_un.xv_uns.xvu_ino 192 193#define VN_POLLEVENT(vp, events) \ 194 do { \ 195 if ((vp)->v_pollinfo != NULL && \ 196 (vp)->v_pollinfo->vpi_events & (events)) \ 197 vn_pollevent((vp), (events)); \ 198 } while (0) 199 200#define VN_KNOTE(vp, b, a) \ 201 do { \ 202 if ((vp)->v_pollinfo != NULL) \ 203 KNOTE(&vp->v_pollinfo->vpi_selinfo.si_note, (b), (a)); \ 204 } while (0) 205#define VN_KNOTE_LOCKED(vp, b) VN_KNOTE(vp, b, 1) 206#define VN_KNOTE_UNLOCKED(vp, b) VN_KNOTE(vp, b, 0) 207 208/* 209 * Vnode flags. 210 * VI flags are protected by interlock and live in v_iflag 211 * VV flags are protected by the vnode lock and live in v_vflag 212 */ 213#define VI_XLOCK 0x0001 /* vnode is locked to change vtype */ 214#define VI_XWANT 0x0002 /* thread is waiting for vnode */ 215#define VI_OLOCK 0x0008 /* vnode is locked waiting for an object */ 216#define VI_OWANT 0x0010 /* a thread is waiting for VOLOCK */ 217#define VI_MOUNT 0x0020 /* Mount in progress */ 218#define VI_AGE 0x0040 /* Insert vnode at head of free list */ 219#define VI_DOOMED 0x0080 /* This vnode is being recycled */ 220#define VI_FREE 0x0100 /* This vnode is on the freelist */ 221#define VI_OBJDIRTY 0x0400 /* object might be dirty */ 222#define VI_DOINGINACT 0x0800 /* VOP_INACTIVE is in progress */ 223 224#define VV_ROOT 0x0001 /* root of its filesystem */ 225#define VV_ISTTY 0x0002 /* vnode represents a tty */ 226#define VV_NOSYNC 0x0004 /* unlinked, stop syncing */ 227#define VV_CACHEDLABEL 0x0010 /* Vnode has valid cached MAC label */ 228#define VV_TEXT 0x0020 /* vnode is a pure text prototype */ 229#define VV_COPYONWRITE 0x0040 /* vnode is doing copy-on-write */ 230#define VV_SYSTEM 0x0080 /* vnode being used by kernel */ 231#define VV_PROCDEP 0x0100 /* vnode is process dependent */ 232 233/* 234 * Vnode attributes. A field value of VNOVAL represents a field whose value 235 * is unavailable (getattr) or which is not to be changed (setattr). 236 */ 237struct vattr { 238 enum vtype va_type; /* vnode type (for create) */ 239 u_short va_mode; /* files access mode and type */ 240 short va_nlink; /* number of references to file */ 241 uid_t va_uid; /* owner user id */ 242 gid_t va_gid; /* owner group id */ 243 dev_t va_fsid; /* filesystem id */ 244 long va_fileid; /* file id */ 245 u_quad_t va_size; /* file size in bytes */ 246 long va_blocksize; /* blocksize preferred for i/o */ 247 struct timespec va_atime; /* time of last access */ 248 struct timespec va_mtime; /* time of last modification */ 249 struct timespec va_ctime; /* time file changed */ 250 struct timespec va_birthtime; /* time file created */ 251 u_long va_gen; /* generation number of file */ 252 u_long va_flags; /* flags defined for file */ 253 dev_t va_rdev; /* device the special file represents */ 254 u_quad_t va_bytes; /* bytes of disk space held by file */ 255 u_quad_t va_filerev; /* file modification number */ 256 u_int va_vaflags; /* operations flags, see below */ 257 long va_spare; /* remain quad aligned */ 258}; 259 260/* 261 * Flags for va_vaflags. 262 */ 263#define VA_UTIMES_NULL 0x01 /* utimes argument was NULL */ 264#define VA_EXCLUSIVE 0x02 /* exclusive create request */ 265 266/* 267 * Flags for ioflag. (high 16 bits used to ask for read-ahead and 268 * help with write clustering) 269 * NB: IO_NDELAY and IO_DIRECT are linked to fcntl.h 270 */ 271#define IO_UNIT 0x0001 /* do I/O as atomic unit */ 272#define IO_APPEND 0x0002 /* append write to end */ 273#define IO_NDELAY 0x0004 /* FNDELAY flag set in file table */ 274#define IO_NODELOCKED 0x0008 /* underlying node already locked */ 275#define IO_ASYNC 0x0010 /* bawrite rather then bdwrite */ 276#define IO_VMIO 0x0020 /* data already in VMIO space */ 277#define IO_INVAL 0x0040 /* invalidate after I/O */ 278#define IO_SYNC 0x0080 /* do I/O synchronously */ 279#define IO_DIRECT 0x0100 /* attempt to bypass buffer cache */ 280#define IO_EXT 0x0400 /* operate on external attributes */ 281#define IO_NORMAL 0x0800 /* operate on regular data */ 282#define IO_NOMACCHECK 0x1000 /* MAC checks unnecessary */ 283 284#define IO_SEQMAX 0x7F /* seq heuristic max value */ 285#define IO_SEQSHIFT 16 /* seq heuristic in upper 16 bits */ 286 287/* 288 * Modes. Some values same as Ixxx entries from inode.h for now. 289 */ 290#define VEXEC 000100 /* execute/search permission */ 291#define VWRITE 000200 /* write permission */ 292#define VREAD 000400 /* read permission */ 293#define VSVTX 001000 /* save swapped text even after use */ 294#define VSGID 002000 /* set group id on execution */ 295#define VSUID 004000 /* set user id on execution */ 296#define VADMIN 010000 /* permission to administer */ 297#define VSTAT 020000 /* permission to retrieve attrs */ 298#define VAPPEND 040000 /* permission to write/append */ 299#define VALLPERM (VEXEC | VWRITE | VREAD | VADMIN | VSTAT | VAPPEND) 300 301/* 302 * Token indicating no attribute value yet assigned. 303 */ 304#define VNOVAL (-1) 305 306/* 307 * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon) 308 */ 309#define VLKTIMEOUT (hz / 20 + 1) 310 311#ifdef _KERNEL 312 313#ifdef MALLOC_DECLARE 314MALLOC_DECLARE(M_VNODE); 315#endif 316 317/* 318 * Convert between vnode types and inode formats (since POSIX.1 319 * defines mode word of stat structure in terms of inode formats). 320 */ 321extern enum vtype iftovt_tab[]; 322extern int vttoif_tab[]; 323#define IFTOVT(mode) (iftovt_tab[((mode) & S_IFMT) >> 12]) 324#define VTTOIF(indx) (vttoif_tab[(int)(indx)]) 325#define MAKEIMODE(indx, mode) (int)(VTTOIF(indx) | (mode)) 326 327/* 328 * Flags to various vnode functions. 329 */ 330#define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */ 331#define FORCECLOSE 0x0002 /* vflush: force file closure */ 332#define WRITECLOSE 0x0004 /* vflush: only close writable files */ 333#define DOCLOSE 0x0008 /* vclean: close active files */ 334#define V_SAVE 0x0001 /* vinvalbuf: sync file first */ 335#define V_ALT 0x0002 /* vinvalbuf: invalidate only alternate bufs */ 336#define V_NORMAL 0x0004 /* vinvalbuf: invalidate only regular bufs */ 337#define REVOKEALL 0x0001 /* vop_revoke: revoke all aliases */ 338#define V_WAIT 0x0001 /* vn_start_write: sleep for suspend */ 339#define V_NOWAIT 0x0002 /* vn_start_write: don't sleep for suspend */ 340#define V_XSLEEP 0x0004 /* vn_start_write: just return after sleep */ 341 342#define VREF(vp) vref(vp) 343 344#ifdef DIAGNOSTIC 345#define VATTR_NULL(vap) vattr_null(vap) 346#else 347#define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */ 348#endif /* DIAGNOSTIC */ 349 350#define NULLVP ((struct vnode *)NULL) 351 352/* 353 * Global vnode data. 354 */ 355extern struct vnode *rootvnode; /* root (i.e. "/") vnode */ 356extern int async_io_version; /* 0 or POSIX version of AIO i'face */ 357extern int desiredvnodes; /* number of vnodes desired */ 358extern struct uma_zone *namei_zone; 359extern int prtactive; /* nonzero to call vprint() */ 360extern struct vattr va_null; /* predefined null vattr structure */ 361 362/* 363 * Macro/function to check for client cache inconsistency w.r.t. leasing. 364 */ 365#define LEASE_READ 0x1 /* Check lease for readers */ 366#define LEASE_WRITE 0x2 /* Check lease for modifiers */ 367 368extern void (*lease_updatetime)(int deltat); 369 370/* Requires interlock. */ 371#define VCANRECYCLE(vp) \ 372 (!((vp)->v_iflag & (VI_DOOMED|VI_DOINGINACT|VI_XLOCK)) && \ 373 ((vp)->v_iflag & VI_FREE) && \ 374 !(vp)->v_holdcnt && !(vp)->v_usecount) 375 376/* Requires interlock. */ 377#define VSHOULDFREE(vp) \ 378 (!((vp)->v_iflag & (VI_FREE|VI_DOOMED|VI_DOINGINACT)) && \ 379 !(vp)->v_holdcnt && !(vp)->v_usecount && \ 380 (!(vp)->v_object || \ 381 !((vp)->v_object->ref_count || (vp)->v_object->resident_page_count))) 382 383/* Requires interlock. */ 384#define VMIGHTFREE(vp) \ 385 (!((vp)->v_iflag & (VI_FREE|VI_DOOMED|VI_XLOCK|VI_DOINGINACT)) && \ 386 LIST_EMPTY(&(vp)->v_cache_src) && !(vp)->v_usecount) 387 388/* Requires interlock. */ 389#define VSHOULDBUSY(vp) \ 390 (((vp)->v_iflag & VI_FREE) && \ 391 ((vp)->v_holdcnt || (vp)->v_usecount)) 392 393#define VI_LOCK(vp) mtx_lock(&(vp)->v_interlock) 394#define VI_TRYLOCK(vp) mtx_trylock(&(vp)->v_interlock) 395#define VI_UNLOCK(vp) mtx_unlock(&(vp)->v_interlock) 396#define VI_MTX(vp) (&(vp)->v_interlock) 397 398#endif /* _KERNEL */ 399 400/* 401 * Mods for extensibility. 402 */ 403 404/* 405 * Flags for vdesc_flags: 406 */ 407#define VDESC_MAX_VPS 16 408/* Low order 16 flag bits are reserved for willrele flags for vp arguments. */ 409#define VDESC_VP0_WILLRELE 0x0001 410#define VDESC_VP1_WILLRELE 0x0002 411#define VDESC_VP2_WILLRELE 0x0004 412#define VDESC_VP3_WILLRELE 0x0008 413#define VDESC_NOMAP_VPP 0x0100 414#define VDESC_VPP_WILLRELE 0x0200 415 416/* 417 * A generic structure. 418 * This can be used by bypass routines to identify generic arguments. 419 */ 420struct vop_generic_args { 421 struct vnodeop_desc *a_desc; 422 /* other random data follows, presumably */ 423}; 424 425typedef int vop_bypass_t(struct vop_generic_args *); 426 427/* 428 * VDESC_NO_OFFSET is used to identify the end of the offset list 429 * and in places where no such field exists. 430 */ 431#define VDESC_NO_OFFSET -1 432 433/* 434 * This structure describes the vnode operation taking place. 435 */ 436struct vnodeop_desc { 437 char *vdesc_name; /* a readable name for debugging */ 438 int vdesc_flags; /* VDESC_* flags */ 439 vop_bypass_t *vdesc_call; /* Function to call */ 440 441 /* 442 * These ops are used by bypass routines to map and locate arguments. 443 * Creds and procs are not needed in bypass routines, but sometimes 444 * they are useful to (for example) transport layers. 445 * Nameidata is useful because it has a cred in it. 446 */ 447 int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */ 448 int vdesc_vpp_offset; /* return vpp location */ 449 int vdesc_cred_offset; /* cred location, if any */ 450 int vdesc_thread_offset; /* thread location, if any */ 451 int vdesc_componentname_offset; /* if any */ 452 /* 453 * Finally, we've got a list of private data (about each operation) 454 * for each transport layer. (Support to manage this list is not 455 * yet part of BSD.) 456 */ 457 caddr_t *vdesc_transports; 458}; 459 460#ifdef _KERNEL 461/* 462 * A list of all the operation descs. 463 */ 464extern struct vnodeop_desc *vnodeop_descs[]; 465 466#define VOPARG_OFFSETOF(s_type, field) __offsetof(s_type, field) 467#define VOPARG_OFFSETTO(s_type, s_offset, struct_p) \ 468 ((s_type)(((char*)(struct_p)) + (s_offset))) 469 470 471#ifdef DEBUG_VFS_LOCKS 472/* 473 * Support code to aid in debugging VFS locking problems. Not totally 474 * reliable since if the thread sleeps between changing the lock 475 * state and checking it with the assert, some other thread could 476 * change the state. They are good enough for debugging a single 477 * filesystem using a single-threaded test. 478 */ 479void assert_vi_locked(struct vnode *vp, const char *str); 480void assert_vi_unlocked(struct vnode *vp, const char *str); 481#if 0 482void assert_vop_elocked(struct vnode *vp, const char *str); 483void assert_vop_elocked_other(struct vnode *vp, const char *str); 484#endif 485void assert_vop_locked(struct vnode *vp, const char *str); 486#if 0 487voi0 assert_vop_slocked(struct vnode *vp, const char *str); 488#endif 489void assert_vop_unlocked(struct vnode *vp, const char *str); 490 491/* These are called from within the actual VOPS. */ 492void vop_lock_pre(void *a); 493void vop_lock_post(void *a, int rc); 494void vop_lookup_post(void *a, int rc); 495void vop_lookup_pre(void *a); 496void vop_rename_pre(void *a); 497void vop_strategy_pre(void *a); 498void vop_unlock_post(void *a, int rc); 499void vop_unlock_pre(void *a); 500 501#define ASSERT_VI_LOCKED(vp, str) assert_vi_locked((vp), (str)) 502#define ASSERT_VI_UNLOCKED(vp, str) assert_vi_unlocked((vp), (str)) 503#if 0 504#define ASSERT_VOP_ELOCKED(vp, str) assert_vop_elocked((vp), (str)) 505#define ASSERT_VOP_ELOCKED_OTHER(vp, str) assert_vop_locked_other((vp), (str)) 506#endif 507#define ASSERT_VOP_LOCKED(vp, str) assert_vop_locked((vp), (str)) 508#if 0 509#define ASSERT_VOP_SLOCKED(vp, str) assert_vop_slocked((vp), (str)) 510#endif 511#define ASSERT_VOP_UNLOCKED(vp, str) assert_vop_unlocked((vp), (str)) 512 513#else /* !DEBUG_VFS_LOCKS */ 514 515#define ASSERT_VI_LOCKED(vp, str) 516#define ASSERT_VI_UNLOCKED(vp, str) 517#if 0 518#define ASSERT_VOP_ELOCKED(vp, str) 519#define ASSERT_VOP_ELOCKED_OTHER(vp, str) 520#endif 521#define ASSERT_VOP_LOCKED(vp, str) 522#if 0 523#define ASSERT_VOP_SLOCKED(vp, str) 524#endif 525#define ASSERT_VOP_UNLOCKED(vp, str) 526#endif /* DEBUG_VFS_LOCKS */ 527 528 529/* 530 * This call works for vnodes in the kernel. 531 */ 532#define VCALL(c) ((c)->a_desc->vdesc_call(c)) 533 534/* 535 * VMIO support inline 536 */ 537 538extern int vmiodirenable; 539 540static __inline int 541vn_canvmio(struct vnode *vp) 542{ 543 if (vp && (vp->v_type == VREG || (vmiodirenable && vp->v_type == VDIR))) 544 return(TRUE); 545 return(FALSE); 546} 547 548/* 549 * Finally, include the default set of vnode operations. 550 */ 551#include "vnode_if.h" 552 553/* 554 * Public vnode manipulation functions. 555 */ 556struct componentname; 557struct file; 558struct mount; 559struct nameidata; 560struct ostat; 561struct thread; 562struct proc; 563struct stat; 564struct nstat; 565struct ucred; 566struct uio; 567struct vattr; 568struct vnode; 569 570extern int (*lease_check_hook)(struct vop_lease_args *); 571extern int (*softdep_fsync_hook)(struct vnode *); 572extern int (*softdep_process_worklist_hook)(struct mount *); 573 574/* cache_* may belong in namei.h. */ 575void cache_enter(struct vnode *dvp, struct vnode *vp, 576 struct componentname *cnp); 577int cache_lookup(struct vnode *dvp, struct vnode **vpp, 578 struct componentname *cnp); 579void cache_purge(struct vnode *vp); 580void cache_purgevfs(struct mount *mp); 581int cache_leaf_test(struct vnode *vp); 582int change_dir(struct vnode *vp, struct thread *td); 583int change_root(struct vnode *vp, struct thread *td); 584void cvtstat(struct stat *st, struct ostat *ost); 585void cvtnstat(struct stat *sb, struct nstat *nsb); 586int getnewvnode(const char *tag, struct mount *mp, struct vop_vector *vops, 587 struct vnode **vpp); 588u_quad_t init_va_filerev(void); 589int lease_check(struct vop_lease_args *ap); 590int speedup_syncer(void); 591#define textvp_fullpath(p, rb, rfb) \ 592 vn_fullpath(FIRST_THREAD_IN_PROC(p), (p)->p_textvp, rb, rfb) 593int vn_fullpath(struct thread *td, struct vnode *vn, 594 char **retbuf, char **freebuf); 595int vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid, 596 mode_t acc_mode, struct ucred *cred, int *privused); 597int vaccess_acl_posix1e(enum vtype type, uid_t file_uid, 598 gid_t file_gid, struct acl *acl, mode_t acc_mode, 599 struct ucred *cred, int *privused); 600void vattr_null(struct vattr *vap); 601int vcount(struct vnode *vp); 602void vdrop(struct vnode *); 603void vdropl(struct vnode *); 604int vfinddev(struct cdev *dev, struct vnode **vpp); 605void vfs_add_vnodeops(const void *); 606void vfs_rm_vnodeops(const void *); 607int vflush(struct mount *mp, int rootrefs, int flags, struct thread *td); 608int vget(struct vnode *vp, int lockflag, struct thread *td); 609void vgone(struct vnode *vp); 610void vgonel(struct vnode *vp, struct thread *td); 611void vhold(struct vnode *); 612void vholdl(struct vnode *); 613int vinvalbuf(struct vnode *vp, int save, 614 struct thread *td, int slpflag, int slptimeo); 615int vtruncbuf(struct vnode *vp, struct ucred *cred, struct thread *td, 616 off_t length, int blksize); 617void vn_printf(struct vnode *vp, const char *fmt, ...); 618#define vprint(label, vp) vn_printf((vp), "%s\n", (label)) 619int vrecycle(struct vnode *vp, struct thread *td); 620int vn_close(struct vnode *vp, 621 int flags, struct ucred *file_cred, struct thread *td); 622void vn_finished_write(struct mount *mp); 623int vn_isdisk(struct vnode *vp, int *errp); 624int vn_lock(struct vnode *vp, int flags, struct thread *td); 625#ifdef DEBUG_LOCKS 626int debug_vn_lock(struct vnode *vp, int flags, struct thread *p, 627 const char *filename, int line); 628#define vn_lock(vp,flags,p) debug_vn_lock(vp,flags,p,__FILE__,__LINE__) 629#endif 630int vn_open(struct nameidata *ndp, int *flagp, int cmode, int fdidx); 631int vn_open_cred(struct nameidata *ndp, int *flagp, int cmode, 632 struct ucred *cred, int fdidx); 633void vn_pollevent(struct vnode *vp, int events); 634void vn_pollgone(struct vnode *vp); 635int vn_pollrecord(struct vnode *vp, struct thread *p, int events); 636int vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, 637 int len, off_t offset, enum uio_seg segflg, int ioflg, 638 struct ucred *active_cred, struct ucred *file_cred, int *aresid, 639 struct thread *td); 640int vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, caddr_t base, 641 size_t len, off_t offset, enum uio_seg segflg, int ioflg, 642 struct ucred *active_cred, struct ucred *file_cred, size_t *aresid, 643 struct thread *td); 644int vn_stat(struct vnode *vp, struct stat *sb, struct ucred *active_cred, 645 struct ucred *file_cred, struct thread *td); 646int vn_start_write(struct vnode *vp, struct mount **mpp, int flags); 647int vn_write_suspend_wait(struct vnode *vp, struct mount *mp, 648 int flags); 649int vn_writechk(struct vnode *vp); 650int vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, 651 const char *attrname, int *buflen, char *buf, struct thread *td); 652int vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, 653 const char *attrname, int buflen, char *buf, struct thread *td); 654int vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, 655 const char *attrname, struct thread *td); 656int vfs_cache_lookup(struct vop_lookup_args *ap); 657void vfs_timestamp(struct timespec *); 658void vfs_write_resume(struct mount *mp); 659int vfs_write_suspend(struct mount *mp); 660int vop_stdbmap(struct vop_bmap_args *); 661int vop_stdfsync(struct vop_fsync_args *); 662int vop_stdgetwritemount(struct vop_getwritemount_args *); 663int vop_stdgetpages(struct vop_getpages_args *); 664int vop_stdinactive(struct vop_inactive_args *); 665int vop_stdislocked(struct vop_islocked_args *); 666int vop_stdlock(struct vop_lock_args *); 667int vop_stdputpages(struct vop_putpages_args *); 668int vop_stdunlock(struct vop_unlock_args *); 669int vop_nopoll(struct vop_poll_args *); 670int vop_stdpathconf(struct vop_pathconf_args *); 671int vop_stdpoll(struct vop_poll_args *); 672int vop_eopnotsupp(struct vop_generic_args *ap); 673int vop_ebadf(struct vop_generic_args *ap); 674int vop_einval(struct vop_generic_args *ap); 675int vop_enotty(struct vop_generic_args *ap); 676int vop_null(struct vop_generic_args *ap); 677int vop_panic(struct vop_generic_args *ap); 678 679void vfree(struct vnode *); 680void vput(struct vnode *vp); 681void vrele(struct vnode *vp); 682void vref(struct vnode *vp); 683int vrefcnt(struct vnode *vp); 684void vbusy(struct vnode *vp); 685void v_addpollinfo(struct vnode *vp); 686 687int vnode_create_vobject(struct vnode *vp, size_t size, struct thread *td); 688void vnode_destroy_vobject(struct vnode *vp); 689 690extern struct vop_vector fifo_specops; 691extern struct vop_vector dead_vnodeops; 692extern struct vop_vector default_vnodeops; 693 694#define VOP_PANIC ((void*)(uintptr_t)vop_panic) 695#define VOP_NULL ((void*)(uintptr_t)vop_null) 696#define VOP_EBADF ((void*)(uintptr_t)vop_ebadf) 697#define VOP_ENOTTY ((void*)(uintptr_t)vop_enotty) 698#define VOP_EINVAL ((void*)(uintptr_t)vop_einval) 699#define VOP_EOPNOTSUPP ((void*)(uintptr_t)vop_eopnotsupp) 700 701 702#endif /* _KERNEL */ 703 704#endif /* !_SYS_VNODE_H_ */ 705