This file is indexed.

/usr/include/afs/vnode_inline.h is in libopenafs-dev 1.6.9-2+deb8u7.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
/*
 * Copyright 2007-2008, Sine Nomine Associates and others.
 * All Rights Reserved.
 *
 * This software has been released under the terms of the IBM Public
 * License.  For details, see the LICENSE file in the top-level source
 * directory or online at http://www.openafs.org/dl/license10.html
 */

#ifndef _AFS_VOL_VNODE_INLINE_H
#define _AFS_VOL_VNODE_INLINE_H 1

#include "vnode.h"

/***************************************************/
/* demand attach vnode state machine routines      */
/***************************************************/

/**
 * get a reference to a vnode object.
 *
 * @param[in] vnp  vnode object pointer
 *
 * @internal vnode package internal use only
 *
 * @pre VOL_LOCK must be held
 *
 * @post vnode refcount incremented
 *
 * @see VnCancelReservation_r
 */
static_inline void
VnCreateReservation_r(Vnode * vnp)
{
    Vn_refcount(vnp)++;
    if (Vn_refcount(vnp) == 1) {
	DeleteFromVnLRU(Vn_class(vnp), vnp);
    }
}

extern int TrustVnodeCacheEntry;

/**
 * release a reference to a vnode object.
 *
 * @param[in] vnp  vnode object pointer
 *
 * @pre VOL_LOCK held
 *
 * @post refcount decremented; possibly re-added to vn lru
 *
 * @internal vnode package internal use only
 *
 * @see VnCreateReservation_r
 */
static_inline void
VnCancelReservation_r(Vnode * vnp)
{
    if (--Vn_refcount(vnp) == 0) {
	AddToVnLRU(Vn_class(vnp), vnp);

	/* If caching is turned off,
	 * disassociate vnode cache entry from volume object */
	if (!TrustVnodeCacheEntry) {
	    DeleteFromVVnList(vnp);
	}
    }
}

#ifdef AFS_PTHREAD_ENV
#define VN_SET_WRITER_THREAD_ID(v)  (((v)->writer) = pthread_self())
#else
#define VN_SET_WRITER_THREAD_ID(v)  (LWP_CurrentProcess(&((v)->writer)))
#endif

#define VOL_LOCK_NOT_HELD 0
#define VOL_LOCK_HELD 1
#define MIGHT_DEADLOCK 0
#define WILL_NOT_DEADLOCK 1

/**
 * acquire a lock on a vnode object.
 *
 * @param[in] vnp   vnode object pointer
 * @param[in] type  lock type
 * @param[in] held  whether or not vol glock is held
 * @param[in] safe  whether it it is safe to acquire without dropping vol glock
 *
 * @note caller must guarantee deadlock will not occur
 *
 * @post lock acquired.
 *       for write case, thread owner field set.
 *
 * @note for DAFS, this is a no-op
 *
 * @internal vnode package internal use only
 */
static_inline void
VnLock(Vnode * vnp, int type, int held, int safe)
{
#ifdef AFS_DEMAND_ATTACH_FS
    if (type == WRITE_LOCK) {
	VN_SET_WRITER_THREAD_ID(vnp);
    }
#else /* !AFS_DEMAND_ATTACH_FS */
    if (held && !safe) {
	VOL_UNLOCK;
    }
    if (type == READ_LOCK) {
	ObtainReadLock(&vnp->lock);
    } else {
	ObtainWriteLock(&vnp->lock);
	VN_SET_WRITER_THREAD_ID(vnp);
    }
    if (held && !safe) {
	VOL_LOCK;
    }
#endif /* !AFS_DEMAND_ATTACH_FS */
}

/**
 * release a lock on a vnode object.
 *
 * @param[in] vnp   vnode object pointer
 * @param[in] type  lock type
 *
 * @note for DAFS, this is a no-op
 *
 * @internal vnode package internal use only
 */
static_inline void
VnUnlock(Vnode * vnp, int type)
{
    if (type == READ_LOCK) {
#ifndef AFS_DEMAND_ATTACH_FS
	ReleaseReadLock(&vnp->lock);
#endif
    } else {
	vnp->writer = 0;
#ifndef AFS_DEMAND_ATTACH_FS
	ReleaseWriteLock(&vnp->lock);
#endif
    }
}


#ifdef AFS_DEMAND_ATTACH_FS
/**
 * change state, and notify other threads,
 * return previous state to caller.
 *
 * @param[in] vnp        pointer to vnode object
 * @param[in] new_state  new vnode state value
 *
 * @pre VOL_LOCK held
 *
 * @post vnode state changed
 *
 * @return previous vnode state
 *
 * @note DEMAND_ATTACH_FS only
 *
 * @internal vnode package internal use only
 */
static_inline VnState
VnChangeState_r(Vnode * vnp, VnState new_state)
{
    VnState old_state = Vn_state(vnp);

    Vn_state(vnp) = new_state;
    CV_BROADCAST(&Vn_stateCV(vnp));
    return old_state;
}

/**
 * tells caller whether or not the current state requires
 * exclusive access without holding glock.
 *
 * @param[in] state  vnode state enumeration
 *
 * @return whether vnode state is a mutually exclusive state
 *   @retval 0  no, state is re-entrant
 *   @retval 1  yes, state is mutually exclusive
 *
 * @note DEMAND_ATTACH_FS only
 */
static_inline int
VnIsExclusiveState(VnState state)
{
    switch (state) {
    case VN_STATE_RELEASING:
    case VN_STATE_CLOSING:
    case VN_STATE_ALLOC:
    case VN_STATE_LOAD:
    case VN_STATE_EXCLUSIVE:
    case VN_STATE_STORE:
	return 1;
    default:
	return 0;
    }
}

/**
 * tell caller whether vnode state is an error condition.
 *
 * @param[in] state  vnode state enumeration
 *
 * @return whether vnode state is in error state
 *   @retval 0  state is not an error state
 *   @retval 1  state is an error state
 *
 * @note DEMAND_ATTACH_FS only
 */
static_inline int
VnIsErrorState(VnState state)
{
    switch (state) {
    case VN_STATE_ERROR:
	return 1;
    default:
	return 0;
    }
}

/**
 * tell caller whether vnode state is valid.
 *
 * @param[in] state  vnode state enumeration
 *
 * @return whether vnode state is a mutually exclusive state
 *   @retval 0  no, state is not valid
 *   @retval 1  yes, state is a valid enumeration member
 *
 * @note DEMAND_ATTACH_FS only
 */
static_inline int
VnIsValidState(VnState state)
{
    if (((int) state >= 0) &&
	(state < VN_STATE_COUNT)) {
	return 1;
    }
    return 0;
}

/**
 * wait for the vnode to change states.
 *
 * @param[in] vnp  vnode object pointer
 *
 * @pre VOL_LOCK held; ref held on vnode
 *
 * @post VOL_LOCK held; vnode state has changed from previous value
 *
 * @note DEMAND_ATTACH_FS only
 */
static_inline void
VnWaitStateChange_r(Vnode * vnp)
{
    VnState state_save = Vn_state(vnp);

    osi_Assert(Vn_refcount(vnp));
    do {
	VOL_CV_WAIT(&Vn_stateCV(vnp));
    } while (Vn_state(vnp) == state_save);
    osi_Assert(!(Vn_stateFlags(vnp) & VN_ON_LRU));
}

/**
 * wait for blocking ops to end.
 *
 * @pre VOL_LOCK held; ref held on vnode
 *
 * @post VOL_LOCK held; vnode not in exclusive state
 *
 * @param[in] vnp  vnode object pointer
 *
 * @note DEMAND_ATTACH_FS only
 */
static_inline void
VnWaitExclusiveState_r(Vnode * vnp)
{
    osi_Assert(Vn_refcount(vnp));
    while (VnIsExclusiveState(Vn_state(vnp))) {
	VOL_CV_WAIT(&Vn_stateCV(vnp));
    }
    osi_Assert(!(Vn_stateFlags(vnp) & VN_ON_LRU));
}

/**
 * wait until vnode is in non-exclusive state, and there are no active readers.
 *
 * @param[in] vnp  vnode object pointer
 *
 * @pre VOL_LOCK held; ref held on vnode
 *
 * @post VOL_LOCK held; vnode is in non-exclusive state and has no active readers
 *
 * @note DEMAND_ATTACH_FS only
 */
static_inline void
VnWaitQuiescent_r(Vnode * vnp)
{
    osi_Assert(Vn_refcount(vnp));
    while (VnIsExclusiveState(Vn_state(vnp)) ||
	   Vn_readers(vnp)) {
	VOL_CV_WAIT(&Vn_stateCV(vnp));
    }
    osi_Assert(!(Vn_stateFlags(vnp) & VN_ON_LRU));
}

/**
 * register a new reader on a vnode.
 *
 * @param[in] vnp  vnode object pointer
 *
 * @pre VOL_LOCK held.
 *      ref held on vnode.
 *      vnode in VN_STATE_READ or VN_STATE_ONLINE
 *
 * @post refcount incremented.
 *       state set to VN_STATE_READ.
 *
 * @note DEMAND_ATTACH_FS only
 *
 * @internal vnode package internal use only
 */
static_inline void
VnBeginRead_r(Vnode * vnp)
{
    if (!Vn_readers(vnp)) {
	osi_Assert(Vn_state(vnp) == VN_STATE_ONLINE);
	VnChangeState_r(vnp, VN_STATE_READ);
    }
    Vn_readers(vnp)++;
    osi_Assert(Vn_state(vnp) == VN_STATE_READ);
}

/**
 * deregister a reader on a vnode.
 *
 * @param[in] vnp  vnode object pointer
 *
 * @pre VOL_LOCK held.
 *      ref held on vnode.
 *      read ref held on vnode.
 *      vnode in VN_STATE_READ.
 *
 * @post refcount decremented.
 *       when count reaches zero, state set to VN_STATE_ONLINE.
 *
 * @note DEMAND_ATTACH_FS only
 *
 * @internal vnode package internal use only
 */
static_inline void
VnEndRead_r(Vnode * vnp)
{
    osi_Assert(Vn_readers(vnp) > 0);
    Vn_readers(vnp)--;
    if (!Vn_readers(vnp)) {
	CV_BROADCAST(&Vn_stateCV(vnp));
	VnChangeState_r(vnp, VN_STATE_ONLINE);
    }
}

#endif /* AFS_DEMAND_ATTACH_FS */

#endif /* _AFS_VOL_VNODE_INLINE_H */