root / lab4 / .minix-src / include / sys / vnode.h @ 13
History | View | Annotate | Download (20.5 KB)
| 1 |
/* $NetBSD: vnode.h,v 1.256 2015/07/12 08:11:28 hannken Exp $ */
|
|---|---|
| 2 |
|
| 3 |
/*-
|
| 4 |
* Copyright (c) 2008 The NetBSD Foundation, Inc.
|
| 5 |
* All rights reserved.
|
| 6 |
*
|
| 7 |
* Redistribution and use in source and binary forms, with or without
|
| 8 |
* modification, are permitted provided that the following conditions
|
| 9 |
* are met:
|
| 10 |
* 1. Redistributions of source code must retain the above copyright
|
| 11 |
* notice, this list of conditions and the following disclaimer.
|
| 12 |
* 2. Redistributions in binary form must reproduce the above copyright
|
| 13 |
* notice, this list of conditions and the following disclaimer in the
|
| 14 |
* documentation and/or other materials provided with the distribution.
|
| 15 |
*
|
| 16 |
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
| 17 |
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
| 18 |
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
| 19 |
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
| 20 |
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
| 21 |
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
| 22 |
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
| 23 |
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
| 24 |
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
| 25 |
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
| 26 |
* POSSIBILITY OF SUCH DAMAGE.
|
| 27 |
*/
|
| 28 |
|
| 29 |
/*
|
| 30 |
* Copyright (c) 1989, 1993
|
| 31 |
* The Regents of the University of California. All rights reserved.
|
| 32 |
*
|
| 33 |
* Redistribution and use in source and binary forms, with or without
|
| 34 |
* modification, are permitted provided that the following conditions
|
| 35 |
* are met:
|
| 36 |
* 1. Redistributions of source code must retain the above copyright
|
| 37 |
* notice, this list of conditions and the following disclaimer.
|
| 38 |
* 2. Redistributions in binary form must reproduce the above copyright
|
| 39 |
* notice, this list of conditions and the following disclaimer in the
|
| 40 |
* documentation and/or other materials provided with the distribution.
|
| 41 |
* 3. Neither the name of the University nor the names of its contributors
|
| 42 |
* may be used to endorse or promote products derived from this software
|
| 43 |
* without specific prior written permission.
|
| 44 |
*
|
| 45 |
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
| 46 |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
| 47 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
| 48 |
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
| 49 |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
| 50 |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
| 51 |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
| 52 |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
| 53 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
| 54 |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
| 55 |
* SUCH DAMAGE.
|
| 56 |
*
|
| 57 |
* @(#)vnode.h 8.17 (Berkeley) 5/20/95
|
| 58 |
*/
|
| 59 |
|
| 60 |
#ifndef _SYS_VNODE_H_
|
| 61 |
#define _SYS_VNODE_H_
|
| 62 |
|
| 63 |
#include <sys/event.h> |
| 64 |
#include <sys/queue.h> |
| 65 |
#include <sys/condvar.h> |
| 66 |
#include <sys/rwlock.h> |
| 67 |
#include <sys/mutex.h> |
| 68 |
|
| 69 |
/* XXX: clean up includes later */
|
| 70 |
#include <uvm/uvm_param.h> /* XXX */ |
| 71 |
#include <uvm/uvm_pglist.h> /* XXX */ |
| 72 |
#include <uvm/uvm_object.h> /* XXX */ |
| 73 |
#include <uvm/uvm_extern.h> /* XXX */ |
| 74 |
|
| 75 |
struct namecache;
|
| 76 |
struct uvm_ractx;
|
| 77 |
|
| 78 |
/*
|
| 79 |
* The vnode is the focus of all file activity in UNIX. There is a
|
| 80 |
* unique vnode allocated for each active file, each current directory,
|
| 81 |
* each mounted-on file, text file, and the root.
|
| 82 |
*/
|
| 83 |
|
| 84 |
/*
|
| 85 |
* Vnode types. VNON means no type.
|
| 86 |
*/
|
| 87 |
enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD };
|
| 88 |
|
| 89 |
#define VNODE_TYPES \
|
| 90 |
"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" |
| 91 |
|
| 92 |
/*
|
| 93 |
* Vnode tag types.
|
| 94 |
* These are for the benefit of external programs only (e.g., pstat)
|
| 95 |
* and should NEVER be inspected by the kernel.
|
| 96 |
*/
|
| 97 |
enum vtagtype {
|
| 98 |
VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_MSDOSFS, VT_LFS, VT_LOFS, |
| 99 |
VT_FDESC, VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS, |
| 100 |
VT_AFS, VT_ISOFS, VT_UNION, VT_ADOSFS, VT_EXT2FS, VT_CODA, |
| 101 |
VT_FILECORE, VT_NTFS, VT_VFS, VT_OVERLAY, VT_SMBFS, VT_PTYFS, |
| 102 |
VT_TMPFS, VT_UDF, VT_SYSVBFS, VT_PUFFS, VT_HFS, VT_EFS, VT_ZFS, |
| 103 |
VT_RUMP, VT_NILFS, VT_V7FS, VT_CHFS |
| 104 |
}; |
| 105 |
|
| 106 |
#define VNODE_TAGS \
|
| 107 |
"VT_NON", "VT_UFS", "VT_NFS", "VT_MFS", "VT_MSDOSFS", "VT_LFS", "VT_LOFS", \ |
| 108 |
"VT_FDESC", "VT_PORTAL", "VT_NULL", "VT_UMAP", "VT_KERNFS", "VT_PROCFS", \ |
| 109 |
"VT_AFS", "VT_ISOFS", "VT_UNION", "VT_ADOSFS", "VT_EXT2FS", "VT_CODA", \ |
| 110 |
"VT_FILECORE", "VT_NTFS", "VT_VFS", "VT_OVERLAY", "VT_SMBFS", "VT_PTYFS", \ |
| 111 |
"VT_TMPFS", "VT_UDF", "VT_SYSVBFS", "VT_PUFFS", "VT_HFS", "VT_EFS", \ |
| 112 |
"VT_ZFS", "VT_RUMP", "VT_NILFS", "VT_V7FS", "VT_CHFS" |
| 113 |
|
| 114 |
struct vnode;
|
| 115 |
struct buf;
|
| 116 |
|
| 117 |
LIST_HEAD(buflists, buf); |
| 118 |
TAILQ_HEAD(vnodelst, vnode); |
| 119 |
|
| 120 |
/*
|
| 121 |
* Reading or writing any of these items requires holding the appropriate
|
| 122 |
* lock. Field markings and the corresponding locks:
|
| 123 |
*
|
| 124 |
* : stable, reference to the vnode is required
|
| 125 |
* f vnode_free_list_lock, or vrele_lock for vrele_list
|
| 126 |
* i v_interlock
|
| 127 |
* m mntvnode_lock
|
| 128 |
* n namecache_lock
|
| 129 |
* s syncer_data_lock
|
| 130 |
* u locked by underlying filesystem
|
| 131 |
* v vnode lock
|
| 132 |
* x v_interlock + bufcache_lock to modify, either to inspect
|
| 133 |
*
|
| 134 |
* Each underlying filesystem allocates its own private area and hangs
|
| 135 |
* it from v_data.
|
| 136 |
*/
|
| 137 |
struct vnode {
|
| 138 |
struct uvm_object v_uobj; /* i: the VM object */ |
| 139 |
kcondvar_t v_cv; /* i: synchronization */
|
| 140 |
voff_t v_size; /* i: size of file */
|
| 141 |
voff_t v_writesize; /* i: new size after write */
|
| 142 |
int v_iflag; /* i: VI_* flags */ |
| 143 |
int v_vflag; /* v: VV_* flags */ |
| 144 |
int v_uflag; /* u: VU_* flags */ |
| 145 |
int v_numoutput; /* i: # of pending writes */ |
| 146 |
int v_writecount; /* i: ref count of writers */ |
| 147 |
int v_holdcnt; /* i: page & buffer refs */ |
| 148 |
int v_synclist_slot; /* s: synclist slot index */ |
| 149 |
struct mount *v_mount; /* v: ptr to vfs we are in */ |
| 150 |
int (**v_op)(void *); /* :: vnode operations vector */ |
| 151 |
TAILQ_ENTRY(vnode) v_freelist; /* f: vnode freelist */
|
| 152 |
struct vnodelst *v_freelisthd; /* f: which freelist? */ |
| 153 |
TAILQ_ENTRY(vnode) v_mntvnodes; /* m: vnodes for mount point */
|
| 154 |
struct buflists v_cleanblkhd; /* x: clean blocklist head */ |
| 155 |
struct buflists v_dirtyblkhd; /* x: dirty blocklist head */ |
| 156 |
TAILQ_ENTRY(vnode) v_synclist; /* s: vnodes with dirty bufs */
|
| 157 |
LIST_HEAD(, namecache) v_dnclist; /* n: namecaches (children) */
|
| 158 |
LIST_HEAD(, namecache) v_nclist; /* n: namecaches (parent) */
|
| 159 |
union {
|
| 160 |
struct mount *vu_mountedhere;/* v: ptr to vfs (VDIR) */ |
| 161 |
struct socket *vu_socket; /* v: unix ipc (VSOCK) */ |
| 162 |
struct specnode *vu_specnode; /* v: device (VCHR, VBLK) */ |
| 163 |
struct fifoinfo *vu_fifoinfo; /* v: fifo (VFIFO) */ |
| 164 |
struct uvm_ractx *vu_ractx; /* i: read-ahead ctx (VREG) */ |
| 165 |
} v_un; |
| 166 |
enum vtype v_type; /* :: vnode type */ |
| 167 |
enum vtagtype v_tag; /* :: type of underlying data */ |
| 168 |
krwlock_t v_lock; /* v: lock for this vnode */
|
| 169 |
void *v_data; /* :: private data for fs */ |
| 170 |
struct klist v_klist; /* i: notes attached to vnode */ |
| 171 |
}; |
| 172 |
#define v_usecount v_uobj.uo_refs
|
| 173 |
#define v_interlock v_uobj.vmobjlock
|
| 174 |
#define v_mountedhere v_un.vu_mountedhere
|
| 175 |
#define v_socket v_un.vu_socket
|
| 176 |
#define v_specnode v_un.vu_specnode
|
| 177 |
#define v_fifoinfo v_un.vu_fifoinfo
|
| 178 |
#define v_ractx v_un.vu_ractx
|
| 179 |
|
| 180 |
typedef struct vnodelst vnodelst_t; |
| 181 |
typedef struct vnode vnode_t; |
| 182 |
|
| 183 |
/*
|
| 184 |
* Vnode flags. The first set are locked by vnode lock or are stable.
|
| 185 |
* VSYSTEM is only used to skip vflush()ing quota files. VISTTY is used
|
| 186 |
* when reading dead vnodes.
|
| 187 |
*/
|
| 188 |
#define VV_ROOT 0x00000001 /* root of its file system */ |
| 189 |
#define VV_SYSTEM 0x00000002 /* vnode being used by kernel */ |
| 190 |
#define VV_ISTTY 0x00000004 /* vnode represents a tty */ |
| 191 |
#define VV_MAPPED 0x00000008 /* vnode might have user mappings */ |
| 192 |
#define VV_MPSAFE 0x00000010 /* file system code is MP safe */ |
| 193 |
#define VV_LOCKSWORK 0x00000020 /* FS supports locking discipline */ |
| 194 |
|
| 195 |
/*
|
| 196 |
* The second set are locked by vp->v_interlock.
|
| 197 |
*/
|
| 198 |
#define VI_TEXT 0x00000100 /* vnode is a pure text prototype */ |
| 199 |
#define VI_EXECMAP 0x00000200 /* might have PROT_EXEC mappings */ |
| 200 |
#define VI_WRMAP 0x00000400 /* might have PROT_WRITE u. mappings */ |
| 201 |
#define VI_WRMAPDIRTY 0x00000800 /* might have dirty pages */ |
| 202 |
#ifdef _VFS_VNODE_PRIVATE
|
| 203 |
#define VI_XLOCK 0x00001000 /* vnode is locked to change type */ |
| 204 |
#endif /* _VFS_VNODE_PRIVATE */ |
| 205 |
#define VI_ONWORKLST 0x00004000 /* On syncer work-list */ |
| 206 |
#ifdef _VFS_VNODE_PRIVATE
|
| 207 |
#define VI_MARKER 0x00008000 /* Dummy marker vnode */ |
| 208 |
#endif /* _VFS_VNODE_PRIVATE */ |
| 209 |
#ifdef _VFS_VNODE_PRIVATE
|
| 210 |
#define VI_CLEAN 0x00080000 /* has been reclaimed */ |
| 211 |
#define VI_CHANGING 0x00100000 /* vnode changes state */ |
| 212 |
#endif /* _VFS_VNODE_PRIVATE */ |
| 213 |
|
| 214 |
/*
|
| 215 |
* The third set are locked by the underlying file system.
|
| 216 |
*/
|
| 217 |
#define VU_DIROP 0x01000000 /* LFS: involved in a directory op */ |
| 218 |
|
| 219 |
#define VNODE_FLAGBITS \
|
| 220 |
"\20\1ROOT\2SYSTEM\3ISTTY\4MAPPED\5MPSAFE\6LOCKSWORK\11TEXT\12EXECMAP" \
|
| 221 |
"\13WRMAP\14WRMAPDIRTY\15XLOCK\17ONWORKLST\20MARKER" \
|
| 222 |
"\24CLEAN\25CHANGING\31DIROP"
|
| 223 |
|
| 224 |
#define VSIZENOTSET ((voff_t)-1) |
| 225 |
|
| 226 |
/*
|
| 227 |
* vnode lock flags
|
| 228 |
*/
|
| 229 |
#define LK_SHARED 0x00000001 /* shared lock */ |
| 230 |
#define LK_EXCLUSIVE 0x00000002 /* exclusive lock */ |
| 231 |
#define LK_NOWAIT 0x00000010 /* do not sleep to await lock */ |
| 232 |
#define LK_RETRY 0x00020000 /* vn_lock: retry until locked */ |
| 233 |
|
| 234 |
/*
|
| 235 |
* Vnode attributes. A field value of VNOVAL represents a field whose value
|
| 236 |
* is unavailable (getattr) or which is not to be changed (setattr).
|
| 237 |
*/
|
| 238 |
struct vattr {
|
| 239 |
enum vtype va_type; /* vnode type (for create) */ |
| 240 |
mode_t va_mode; /* files access mode and type */
|
| 241 |
nlink_t va_nlink; /* number of references to file */
|
| 242 |
uid_t va_uid; /* owner user id */
|
| 243 |
gid_t va_gid; /* owner group id */
|
| 244 |
dev_t va_fsid; /* file system id (dev for now) */
|
| 245 |
ino_t va_fileid; /* file id */
|
| 246 |
u_quad_t va_size; /* file size in bytes */
|
| 247 |
long va_blocksize; /* blocksize preferred for i/o */ |
| 248 |
struct timespec va_atime; /* time of last access */ |
| 249 |
struct timespec va_mtime; /* time of last modification */ |
| 250 |
struct timespec va_ctime; /* time file changed */ |
| 251 |
struct timespec va_birthtime; /* time file created */ |
| 252 |
u_long va_gen; /* generation number of file */
|
| 253 |
u_long va_flags; /* flags defined for file */
|
| 254 |
dev_t va_rdev; /* device the special file represents */
|
| 255 |
u_quad_t va_bytes; /* bytes of disk space held by file */
|
| 256 |
u_quad_t va_filerev; /* file modification number */
|
| 257 |
u_int va_vaflags; /* operations flags, see below */
|
| 258 |
long va_spare; /* remain quad aligned */ |
| 259 |
}; |
| 260 |
|
| 261 |
/*
|
| 262 |
* Flags for va_vaflags.
|
| 263 |
*/
|
| 264 |
#define VA_UTIMES_NULL 0x01 /* utimes argument was NULL */ |
| 265 |
#define VA_EXCLUSIVE 0x02 /* exclusive create request */ |
| 266 |
|
| 267 |
#ifdef _KERNEL
|
| 268 |
|
| 269 |
/*
|
| 270 |
* Flags for ioflag.
|
| 271 |
*/
|
| 272 |
#define IO_UNIT 0x00010 /* do I/O as atomic unit */ |
| 273 |
#define IO_APPEND 0x00020 /* append write to end */ |
| 274 |
#define IO_SYNC (0x40|IO_DSYNC) /* sync I/O file integrity completion */ |
| 275 |
#define IO_NODELOCKED 0x00080 /* underlying node already locked */ |
| 276 |
#define IO_NDELAY 0x00100 /* FNDELAY flag set in file table */ |
| 277 |
#define IO_DSYNC 0x00200 /* sync I/O data integrity completion */ |
| 278 |
#define IO_ALTSEMANTICS 0x00400 /* use alternate i/o semantics */ |
| 279 |
#define IO_NORMAL 0x00800 /* operate on regular data */ |
| 280 |
#define IO_EXT 0x01000 /* operate on extended attributes */ |
| 281 |
#define IO_DIRECT 0x02000 /* direct I/O hint */ |
| 282 |
#define IO_JOURNALLOCKED 0x04000 /* journal is already locked */ |
| 283 |
#define IO_ADV_MASK 0x00003 /* access pattern hint */ |
| 284 |
|
| 285 |
#define IO_ADV_SHIFT 0 |
| 286 |
#define IO_ADV_ENCODE(adv) (((adv) << IO_ADV_SHIFT) & IO_ADV_MASK)
|
| 287 |
#define IO_ADV_DECODE(ioflag) (((ioflag) & IO_ADV_MASK) >> IO_ADV_SHIFT)
|
| 288 |
|
| 289 |
/*
|
| 290 |
* Modes.
|
| 291 |
*/
|
| 292 |
#define VREAD 00004 /* read, write, execute permissions */ |
| 293 |
#define VWRITE 00002 |
| 294 |
#define VEXEC 00001 |
| 295 |
|
| 296 |
/*
|
| 297 |
* Token indicating no attribute value yet assigned.
|
| 298 |
*/
|
| 299 |
#define VNOVAL (-1) |
| 300 |
|
| 301 |
/*
|
| 302 |
* Convert between vnode types and inode formats (since POSIX.1
|
| 303 |
* defines mode word of stat structure in terms of inode formats).
|
| 304 |
*/
|
| 305 |
extern const enum vtype iftovt_tab[]; |
| 306 |
extern const int vttoif_tab[]; |
| 307 |
#define IFTOVT(mode) (iftovt_tab[((mode) & S_IFMT) >> 12]) |
| 308 |
#define VTTOIF(indx) (vttoif_tab[(int)(indx)]) |
| 309 |
#define MAKEIMODE(indx, mode) (int)(VTTOIF(indx) | (mode)) |
| 310 |
|
| 311 |
/*
|
| 312 |
* Flags to various vnode functions.
|
| 313 |
*/
|
| 314 |
#define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */ |
| 315 |
#define FORCECLOSE 0x0002 /* vflush: force file closeure */ |
| 316 |
#define WRITECLOSE 0x0004 /* vflush: only close writable files */ |
| 317 |
#define V_SAVE 0x0001 /* vinvalbuf: sync file first */ |
| 318 |
|
| 319 |
/*
|
| 320 |
* Flags to various vnode operations.
|
| 321 |
*/
|
| 322 |
#define REVOKEALL 0x0001 /* revoke: revoke all aliases */ |
| 323 |
|
| 324 |
#define FSYNC_WAIT 0x0001 /* fsync: wait for completion */ |
| 325 |
#define FSYNC_DATAONLY 0x0002 /* fsync: hint: sync file data only */ |
| 326 |
#define FSYNC_RECLAIM 0x0004 /* fsync: hint: vnode is being reclaimed */ |
| 327 |
#define FSYNC_LAZY 0x0008 /* fsync: lazy sync (trickle) */ |
| 328 |
#define FSYNC_NOLOG 0x0010 /* fsync: do not flush the log */ |
| 329 |
#define FSYNC_CACHE 0x0100 /* fsync: flush disk caches too */ |
| 330 |
|
| 331 |
#define UPDATE_WAIT 0x0001 /* update: wait for completion */ |
| 332 |
#define UPDATE_DIROP 0x0002 /* update: hint to fs to wait or not */ |
| 333 |
#define UPDATE_CLOSE 0x0004 /* update: clean up on close */ |
| 334 |
|
| 335 |
#define VDEAD_NOWAIT 0x0001 /* vdead_check: do not sleep */ |
| 336 |
|
| 337 |
void holdrelel(struct vnode *); |
| 338 |
void vholdl(struct vnode *); |
| 339 |
void vref(struct vnode *); |
| 340 |
|
| 341 |
static __inline void holdrele(struct vnode *) __unused; |
| 342 |
static __inline void vhold(struct vnode *) __unused; |
| 343 |
|
| 344 |
/*
|
| 345 |
* decrease buf or page ref
|
| 346 |
*/
|
| 347 |
static __inline void |
| 348 |
holdrele(struct vnode *vp)
|
| 349 |
{
|
| 350 |
|
| 351 |
mutex_enter(vp->v_interlock); |
| 352 |
holdrelel(vp); |
| 353 |
mutex_exit(vp->v_interlock); |
| 354 |
} |
| 355 |
|
| 356 |
/*
|
| 357 |
* increase buf or page ref
|
| 358 |
*/
|
| 359 |
static __inline void |
| 360 |
vhold(struct vnode *vp)
|
| 361 |
{
|
| 362 |
|
| 363 |
mutex_enter(vp->v_interlock); |
| 364 |
vholdl(vp); |
| 365 |
mutex_exit(vp->v_interlock); |
| 366 |
} |
| 367 |
|
| 368 |
#define NULLVP ((struct vnode *)NULL) |
| 369 |
|
| 370 |
static __inline void |
| 371 |
VN_KNOTE(struct vnode *vp, long hint) |
| 372 |
{
|
| 373 |
|
| 374 |
mutex_enter(vp->v_interlock); |
| 375 |
KNOTE(&vp->v_klist, hint); |
| 376 |
mutex_exit(vp->v_interlock); |
| 377 |
} |
| 378 |
|
| 379 |
/*
|
| 380 |
* Global vnode data.
|
| 381 |
*/
|
| 382 |
extern struct vnode *rootvnode; /* root (i.e. "/") vnode */ |
| 383 |
extern int desiredvnodes; /* number of vnodes desired */ |
| 384 |
extern u_int numvnodes; /* current number of vnodes */ |
| 385 |
|
| 386 |
#endif /* _KERNEL */ |
| 387 |
|
| 388 |
|
| 389 |
/*
|
| 390 |
* Mods for exensibility.
|
| 391 |
*/
|
| 392 |
|
| 393 |
/*
|
| 394 |
* Flags for vdesc_flags:
|
| 395 |
*/
|
| 396 |
#define VDESC_MAX_VPS 8 |
| 397 |
/* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
|
| 398 |
#define VDESC_VP0_WILLRELE 0x00000001 |
| 399 |
#define VDESC_VP1_WILLRELE 0x00000002 |
| 400 |
#define VDESC_VP2_WILLRELE 0x00000004 |
| 401 |
#define VDESC_VP3_WILLRELE 0x00000008 |
| 402 |
#define VDESC_VP0_WILLUNLOCK 0x00000100 |
| 403 |
#define VDESC_VP1_WILLUNLOCK 0x00000200 |
| 404 |
#define VDESC_VP2_WILLUNLOCK 0x00000400 |
| 405 |
#define VDESC_VP3_WILLUNLOCK 0x00000800 |
| 406 |
#define VDESC_VP0_WILLPUT 0x00000101 |
| 407 |
#define VDESC_VP1_WILLPUT 0x00000202 |
| 408 |
#define VDESC_VP2_WILLPUT 0x00000404 |
| 409 |
#define VDESC_VP3_WILLPUT 0x00000808 |
| 410 |
|
| 411 |
/*
|
| 412 |
* VDESC_NO_OFFSET is used to identify the end of the offset list
|
| 413 |
* and in places where no such field exists.
|
| 414 |
*/
|
| 415 |
#define VDESC_NO_OFFSET -1 |
| 416 |
|
| 417 |
/*
|
| 418 |
* This structure describes the vnode operation taking place.
|
| 419 |
*/
|
| 420 |
struct vnodeop_desc {
|
| 421 |
int vdesc_offset; /* offset in vector--first for speed */ |
| 422 |
const char *vdesc_name; /* a readable name for debugging */ |
| 423 |
int vdesc_flags; /* VDESC_* flags */ |
| 424 |
|
| 425 |
/*
|
| 426 |
* These ops are used by bypass routines to map and locate arguments.
|
| 427 |
* Creds and procs are not needed in bypass routines, but sometimes
|
| 428 |
* they are useful to (for example) transport layers.
|
| 429 |
* Nameidata is useful because it has a cred in it.
|
| 430 |
*/
|
| 431 |
const int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */ |
| 432 |
int vdesc_vpp_offset; /* return vpp location */ |
| 433 |
int vdesc_cred_offset; /* cred location, if any */ |
| 434 |
int vdesc_componentname_offset; /* if any */ |
| 435 |
}; |
| 436 |
|
| 437 |
#ifdef _KERNEL
|
| 438 |
|
| 439 |
/*
|
| 440 |
* Interlock for scanning list of vnodes attached to a mountpoint
|
| 441 |
*/
|
| 442 |
extern kmutex_t mntvnode_lock;
|
| 443 |
|
| 444 |
/*
|
| 445 |
* Union filesystem hook for vn_readdir().
|
| 446 |
*/
|
| 447 |
extern int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct lwp *); |
| 448 |
|
| 449 |
/*
|
| 450 |
* Macros for offsets in the vdesc struct.
|
| 451 |
*/
|
| 452 |
#define VOPARG_OFFSETOF(type, member) offsetof(type, member)
|
| 453 |
#define VOPARG_OFFSETTO(type,offset,sp) ((type)(((char *)(sp)) + (offset))) |
| 454 |
|
| 455 |
/*
|
| 456 |
* This structure is used to configure the new vnodeops vector.
|
| 457 |
*/
|
| 458 |
struct vnodeopv_entry_desc {
|
| 459 |
const struct vnodeop_desc *opve_op; /* which operation this is */ |
| 460 |
int (*opve_impl)(void *); /* code implementing this operation */ |
| 461 |
}; |
| 462 |
|
| 463 |
struct vnodeopv_desc {
|
| 464 |
/* ptr to the ptr to the vector where op should go */
|
| 465 |
int (***opv_desc_vector_p)(void *); |
| 466 |
const struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */ |
| 467 |
}; |
| 468 |
|
| 469 |
/*
|
| 470 |
* A default routine which just returns an error.
|
| 471 |
*/
|
| 472 |
int vn_default_error(void *); |
| 473 |
|
| 474 |
/*
|
| 475 |
* A generic structure.
|
| 476 |
* This can be used by bypass routines to identify generic arguments.
|
| 477 |
*/
|
| 478 |
struct vop_generic_args {
|
| 479 |
struct vnodeop_desc *a_desc;
|
| 480 |
/* other random data follows, presumably */
|
| 481 |
}; |
| 482 |
|
| 483 |
/*
|
| 484 |
* VOCALL calls an op given an ops vector. We break it out because BSD's
|
| 485 |
* vclean changes the ops vector and then wants to call ops with the old
|
| 486 |
* vector.
|
| 487 |
*/
|
| 488 |
/*
|
| 489 |
* actually, vclean doesn't use it anymore, but nfs does,
|
| 490 |
* for device specials and fifos.
|
| 491 |
*/
|
| 492 |
#define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP))
|
| 493 |
|
| 494 |
/*
|
| 495 |
* This call works for vnodes in the kernel.
|
| 496 |
*/
|
| 497 |
#define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP))
|
| 498 |
#define VDESC(OP) (& __CONCAT(OP,_desc))
|
| 499 |
#define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
|
| 500 |
|
| 501 |
/* XXX This include should go away */
|
| 502 |
#include <sys/mount.h> |
| 503 |
|
| 504 |
/*
|
| 505 |
* Finally, include the default set of vnode operations.
|
| 506 |
*/
|
| 507 |
#include <sys/vnode_if.h> |
| 508 |
|
| 509 |
/*
|
| 510 |
* Public vnode manipulation functions.
|
| 511 |
*/
|
| 512 |
struct file;
|
| 513 |
struct filedesc;
|
| 514 |
struct nameidata;
|
| 515 |
struct proc;
|
| 516 |
struct stat;
|
| 517 |
struct uio;
|
| 518 |
struct vattr;
|
| 519 |
struct vnode;
|
| 520 |
|
| 521 |
/* see vnode(9) */
|
| 522 |
void vfs_vnode_sysinit(void); |
| 523 |
int bdevvp(dev_t, struct vnode **); |
| 524 |
int cdevvp(dev_t, struct vnode **); |
| 525 |
int vaccess(enum vtype, mode_t, uid_t, gid_t, mode_t, kauth_cred_t); |
| 526 |
void vattr_null(struct vattr *); |
| 527 |
void vdevgone(int, int, int, enum vtype); |
| 528 |
int vfinddev(dev_t, enum vtype, struct vnode **); |
| 529 |
int vflush(struct mount *, struct vnode *, int); |
| 530 |
int vflushbuf(struct vnode *, int); |
| 531 |
int vget(struct vnode *, int, bool); |
| 532 |
void vgone(struct vnode *); |
| 533 |
int vinvalbuf(struct vnode *, int, kauth_cred_t, struct lwp *, bool, int); |
| 534 |
void vprint(const char *, struct vnode *); |
| 535 |
void vput(struct vnode *); |
| 536 |
bool vrecycle(struct vnode *); |
| 537 |
void vrele(struct vnode *); |
| 538 |
void vrele_async(struct vnode *); |
| 539 |
void vrele_flush(void); |
| 540 |
int vtruncbuf(struct vnode *, daddr_t, bool, int); |
| 541 |
void vwakeup(struct buf *); |
| 542 |
int vdead_check(struct vnode *, int); |
| 543 |
void vrevoke(struct vnode *); |
| 544 |
struct vnode *
|
| 545 |
vnalloc(struct mount *);
|
| 546 |
void vnfree(struct vnode *); |
| 547 |
void vremfree(struct vnode *); |
| 548 |
int vcache_get(struct mount *, const void *, size_t, struct vnode **); |
| 549 |
int vcache_new(struct mount *, struct vnode *, |
| 550 |
struct vattr *, kauth_cred_t, struct vnode **); |
| 551 |
int vcache_rekey_enter(struct mount *, struct vnode *, |
| 552 |
const void *, size_t, const void *, size_t); |
| 553 |
void vcache_rekey_exit(struct mount *, struct vnode *, |
| 554 |
const void *, size_t, const void *, size_t); |
| 555 |
void vcache_remove(struct mount *, const void *, size_t); |
| 556 |
|
| 557 |
/* see vnsubr(9) */
|
| 558 |
int vn_bwrite(void *); |
| 559 |
int vn_close(struct vnode *, int, kauth_cred_t); |
| 560 |
int vn_isunder(struct vnode *, struct vnode *, struct lwp *); |
| 561 |
int vn_lock(struct vnode *, int); |
| 562 |
void vn_markexec(struct vnode *); |
| 563 |
int vn_marktext(struct vnode *); |
| 564 |
int vn_open(struct nameidata *, int, int); |
| 565 |
int vn_rdwr(enum uio_rw, struct vnode *, void *, int, off_t, enum uio_seg, |
| 566 |
int, kauth_cred_t, size_t *, struct lwp *); |
| 567 |
int vn_readdir(struct file *, char *, int, u_int, int *, struct lwp *, |
| 568 |
off_t **, int *);
|
| 569 |
int vn_stat(struct vnode *, struct stat *); |
| 570 |
int vn_kqfilter(struct file *, struct knote *); |
| 571 |
int vn_writechk(struct vnode *); |
| 572 |
int vn_openchk(struct vnode *, kauth_cred_t, int); |
| 573 |
int vn_extattr_get(struct vnode *, int, int, const char *, size_t *, |
| 574 |
void *, struct lwp *); |
| 575 |
int vn_extattr_set(struct vnode *, int, int, const char *, size_t, |
| 576 |
const void *, struct lwp *); |
| 577 |
int vn_extattr_rm(struct vnode *, int, int, const char *, struct lwp *); |
| 578 |
void vn_ra_allocctx(struct vnode *); |
| 579 |
int vn_fifo_bypass(void *); |
| 580 |
|
| 581 |
/* initialise global vnode management */
|
| 582 |
void vntblinit(void); |
| 583 |
|
| 584 |
/* misc stuff */
|
| 585 |
void sched_sync(void *); |
| 586 |
void vn_syncer_add_to_worklist(struct vnode *, int); |
| 587 |
void vn_syncer_remove_from_worklist(struct vnode *); |
| 588 |
int dorevoke(struct vnode *, kauth_cred_t); |
| 589 |
int rawdev_mounted(struct vnode *, struct vnode **); |
| 590 |
uint8_t vtype2dt(enum vtype);
|
| 591 |
|
| 592 |
/* see vfssubr(9) */
|
| 593 |
void vfs_getnewfsid(struct mount *); |
| 594 |
int vfs_drainvnodes(long); |
| 595 |
void vfs_timestamp(struct timespec *); |
| 596 |
#if defined(DDB) || defined(DEBUGPRINT)
|
| 597 |
void vfs_vnode_print(struct vnode *, int, void (*)(const char *, ...) |
| 598 |
__printflike(1, 2)); |
| 599 |
void vfs_mount_print(struct mount *, int, void (*)(const char *, ...) |
| 600 |
__printflike(1, 2)); |
| 601 |
#endif /* DDB */ |
| 602 |
|
| 603 |
#endif /* _KERNEL */ |
| 604 |
|
| 605 |
#endif /* !_SYS_VNODE_H_ */ |