2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
10 #include <afsconfig.h>
11 #include "afs/param.h"
16 #include "afs/sysincludes.h" /* Standard vendor system headers */
17 #ifndef AFS_LINUX22_ENV
18 #include "rpc/types.h"
26 #endif /* AFS_ALPHA_ENV */
27 #include "afsincludes.h" /* Afs-based standard headers */
28 #include "afs/afs_stats.h" /* statistics */
30 /* memory cache routines */
31 static struct memCacheEntry *memCache;
32 static int memCacheBlkSize = 8192;
33 static int memMaxBlkNumber = 0;
34 static int memAllocMaySleep = 0;
36 extern int cacheDiskType;
39 afs_InitMemCache(int blkCount, int blkSize, int flags)
43 AFS_STATCNT(afs_InitMemCache);
45 memCacheBlkSize = blkSize;
47 memMaxBlkNumber = blkCount;
48 memCache = (struct memCacheEntry *)
49 afs_osi_Alloc(memMaxBlkNumber * sizeof(struct memCacheEntry));
50 if (flags & AFSCALL_INIT_MEMCACHE_SLEEP) {
54 for (index = 0; index < memMaxBlkNumber; index++) {
56 (memCache + index)->size = 0;
57 (memCache + index)->dataSize = memCacheBlkSize;
58 LOCK_INIT(&((memCache + index)->afs_memLock), "afs_memLock");
59 if (memAllocMaySleep) {
60 blk = afs_osi_Alloc(memCacheBlkSize);
62 blk = afs_osi_Alloc_NoSleep(memCacheBlkSize);
66 (memCache + index)->data = blk;
67 memset((memCache + index)->data, 0, memCacheBlkSize);
69 #if defined(AFS_SGI62_ENV) || defined(AFS_HAVE_VXFS)
70 afs_InitDualFSCacheOps((struct vnode *)0);
76 printf("afsd: memCache allocation failure at %d KB.\n",
77 (index * memCacheBlkSize) / 1024);
78 while (--index >= 0) {
79 afs_osi_Free((memCache + index)->data, memCacheBlkSize);
80 (memCache + index)->data = NULL;
87 afs_MemCacheClose(char *file)
93 afs_MemCacheOpen(ino_t blkno)
95 struct memCacheEntry *mep;
97 if (blkno < 0 || blkno > memMaxBlkNumber) {
98 osi_Panic("afs_MemCacheOpen: invalid block #");
100 mep = (memCache + blkno);
101 afs_Trace4(afs_iclSetp, CM_TRACE_MEMOPEN, ICL_TYPE_INT32, blkno,
102 ICL_TYPE_POINTER, mep, ICL_TYPE_POINTER, mep->data,
103 ICL_TYPE_STRING, mep->data);
108 * this routine simulates a read in the Memory Cache
111 afs_MemReadBlk(register struct memCacheEntry *mceP, int offset, char *dest,
116 MObtainReadLock(&mceP->afs_memLock);
117 AFS_STATCNT(afs_MemReadBlk);
119 MReleaseReadLock(&mceP->afs_memLock);
122 /* use min of bytes in buffer or requested size */
123 bytesRead = (size < mceP->size - offset) ? size : mceP->size - offset;
127 memcpy(dest, mceP->data + offset, bytesRead);
132 MReleaseReadLock(&mceP->afs_memLock);
137 * this routine simulates a readv in the Memory Cache
140 afs_MemReadvBlk(register struct memCacheEntry *mceP, int offset,
141 struct iovec *iov, int nio, int size)
147 MObtainReadLock(&mceP->afs_memLock);
148 AFS_STATCNT(afs_MemReadBlk);
150 MReleaseReadLock(&mceP->afs_memLock);
153 /* use min of bytes in buffer or requested size */
154 bytesRead = (size < mceP->size - offset) ? size : mceP->size - offset;
157 for (i = 0, size = bytesRead; i < nio && size > 0; i++) {
158 bytesToRead = (size < iov[i].iov_len) ? size : iov[i].iov_len;
160 memcpy(iov[i].iov_base, mceP->data + offset, bytesToRead);
162 offset += bytesToRead;
169 MReleaseReadLock(&mceP->afs_memLock);
174 afs_MemReadUIO(ino_t blkno, struct uio *uioP)
176 register struct memCacheEntry *mceP =
177 (struct memCacheEntry *)afs_MemCacheOpen(blkno);
178 int length = mceP->size - uioP->uio_offset;
181 AFS_STATCNT(afs_MemReadUIO);
182 MObtainReadLock(&mceP->afs_memLock);
183 length = (length < uioP->uio_resid) ? length : uioP->uio_resid;
184 AFS_UIOMOVE(mceP->data + uioP->uio_offset, length, UIO_READ, uioP, code);
185 MReleaseReadLock(&mceP->afs_memLock);
189 /*XXX: this extends a block arbitrarily to support big directories */
191 afs_MemWriteBlk(register struct memCacheEntry *mceP, int offset, char *src,
194 AFS_STATCNT(afs_MemWriteBlk);
195 MObtainWriteLock(&mceP->afs_memLock, 560);
196 if (size + offset > mceP->dataSize) {
197 char *oldData = mceP->data;
199 if (memAllocMaySleep) {
200 mceP->data = afs_osi_Alloc(size + offset);
202 mceP->data = afs_osi_Alloc_NoSleep(size + offset);
204 if (mceP->data == NULL) { /* no available memory */
205 mceP->data = oldData; /* revert back change that was made */
206 MReleaseWriteLock(&mceP->afs_memLock);
207 afs_warn("afs: afs_MemWriteBlk mem alloc failure (%d bytes)\n",
212 /* may overlap, but this is OK */
214 memcpy(mceP->data, oldData, mceP->size);
216 afs_osi_Free(oldData, mceP->dataSize);
217 mceP->dataSize = size + offset;
220 if (mceP->size < offset)
221 memset(mceP->data + mceP->size, 0, offset - mceP->size);
222 memcpy(mceP->data + offset, src, size);
224 mceP->size = (size + offset < mceP->size) ? mceP->size : size + offset;
226 MReleaseWriteLock(&mceP->afs_memLock);
230 /*XXX: this extends a block arbitrarily to support big directories */
232 afs_MemWritevBlk(register struct memCacheEntry *mceP, int offset,
233 struct iovec *iov, int nio, int size)
238 AFS_STATCNT(afs_MemWriteBlk);
239 MObtainWriteLock(&mceP->afs_memLock, 561);
240 if (offset + size > mceP->dataSize) {
241 char *oldData = mceP->data;
243 mceP->data = afs_osi_Alloc(size + offset);
245 /* may overlap, but this is OK */
247 memcpy(mceP->data, oldData, mceP->size);
249 afs_osi_Free(oldData, mceP->dataSize);
250 mceP->dataSize = size + offset;
253 if (mceP->size < offset)
254 memset(mceP->data + mceP->size, 0, offset - mceP->size);
255 for (bytesWritten = 0, i = 0; i < nio && size > 0; i++) {
256 bytesToWrite = (size < iov[i].iov_len) ? size : iov[i].iov_len;
257 memcpy(mceP->data + offset, iov[i].iov_base, bytesToWrite);
258 offset += bytesToWrite;
259 bytesWritten += bytesToWrite;
260 size -= bytesToWrite;
262 mceP->size = (offset < mceP->size) ? mceP->size : offset;
265 MReleaseWriteLock(&mceP->afs_memLock);
270 afs_MemWriteUIO(ino_t blkno, struct uio *uioP)
272 register struct memCacheEntry *mceP =
273 (struct memCacheEntry *)afs_MemCacheOpen(blkno);
276 AFS_STATCNT(afs_MemWriteUIO);
277 MObtainWriteLock(&mceP->afs_memLock, 312);
278 if (uioP->uio_resid + uioP->uio_offset > mceP->dataSize) {
279 char *oldData = mceP->data;
281 mceP->data = afs_osi_Alloc(uioP->uio_resid + uioP->uio_offset);
284 memcpy(mceP->data, oldData, mceP->size);
287 afs_osi_Free(oldData, mceP->dataSize);
288 mceP->dataSize = uioP->uio_resid + uioP->uio_offset;
290 if (mceP->size < uioP->uio_offset)
291 memset(mceP->data + mceP->size, 0,
292 (int)(uioP->uio_offset - mceP->size));
293 AFS_UIOMOVE(mceP->data + uioP->uio_offset, uioP->uio_resid, UIO_WRITE,
295 if (uioP->uio_offset > mceP->size)
296 mceP->size = uioP->uio_offset;
298 MReleaseWriteLock(&mceP->afs_memLock);
303 afs_MemCacheTruncate(register struct memCacheEntry *mceP, int size)
305 AFS_STATCNT(afs_MemCacheTruncate);
307 MObtainWriteLock(&mceP->afs_memLock, 313);
308 /* old directory entry; g.c. */
309 if (size == 0 && mceP->dataSize > memCacheBlkSize) {
310 afs_osi_Free(mceP->data, mceP->dataSize);
311 mceP->data = afs_osi_Alloc(memCacheBlkSize);
312 mceP->dataSize = memCacheBlkSize;
315 if (size < mceP->size)
318 MReleaseWriteLock(&mceP->afs_memLock);
323 afs_MemCacheStoreProc(register struct rx_call *acall,
324 register struct memCacheEntry *mceP,
325 register afs_int32 alen, struct vcache *avc,
326 int *shouldWake, afs_size_t * abytesToXferP,
327 afs_size_t * abytesXferredP, afs_int32 length)
330 register afs_int32 code;
333 struct iovec *tiov; /* no data copying with iovec */
334 int tnio; /* temp for iovec size */
336 AFS_STATCNT(afs_MemCacheStoreProc);
339 * In this case, alen is *always* the amount of data we'll be trying
342 *(abytesToXferP) = alen;
343 *(abytesXferredP) = 0;
344 #endif /* AFS_NOSTATS */
347 * We need to alloc the iovecs on the heap so that they are "pinned" rather than
348 * declare them on the stack - defect 11272
351 (struct iovec *)osi_AllocSmallSpace(sizeof(struct iovec) *
355 ("afs_MemCacheStoreProc: osi_AllocSmallSpace for iovecs returned NULL\n");
358 /* do this at a higher level now -- it's a parameter */
359 /* for now, only do 'continue from close' code if file fits in one
360 * chunk. Could clearly do better: if only one modified chunk
361 * then can still do this. can do this on *last* modified chunk */
362 tlen = avc->m.Length - 1; /* byte position of last byte we'll store */
364 if (AFS_CHUNK(tlen) != 0)
372 tlen = (alen > AFS_LRALLOCSIZ ? AFS_LRALLOCSIZ : alen);
374 code = rx_WritevAlloc(acall, tiov, &tnio, RX_MAXIOVECS, tlen);
377 osi_FreeSmallSpace(tiov);
381 code = afs_MemReadvBlk(mceP, offset, tiov, tnio, tlen);
383 osi_FreeSmallSpace(tiov);
387 code = rx_Writev(acall, tiov, tnio, tlen);
390 (*abytesXferredP) += code;
391 #endif /* AFS_NOSTATS */
393 osi_FreeSmallSpace(tiov);
398 /* if file has been locked on server, can allow store to continue */
399 if (shouldWake && *shouldWake && (rx_GetRemoteStatus(acall) & 1)) {
400 *shouldWake = 0; /* only do this once */
404 osi_FreeSmallSpace(tiov);
409 afs_MemCacheFetchProc(register struct rx_call *acall,
410 register struct memCacheEntry *mceP, afs_size_t abase,
411 struct dcache *adc, struct vcache *avc,
412 afs_size_t * abytesToXferP, afs_size_t * abytesXferredP,
413 afs_int32 lengthFound)
415 register afs_int32 code;
418 struct iovec *tiov; /* no data copying with iovec */
419 register int tlen, offset = 0;
420 int tnio; /* temp for iovec size */
422 AFS_STATCNT(afs_MemCacheFetchProc);
423 length = lengthFound;
424 afs_Trace4(afs_iclSetp, CM_TRACE_MEMFETCH, ICL_TYPE_POINTER, avc,
425 ICL_TYPE_POINTER, mceP, ICL_TYPE_OFFSET,
426 ICL_HANDLE_OFFSET(abase), ICL_TYPE_INT32, length);
428 (*abytesToXferP) = 0;
429 (*abytesXferredP) = 0;
430 #endif /* AFS_NOSTATS */
432 * We need to alloc the iovecs on the heap so that they are "pinned" rather than
433 * declare them on the stack - defect 11272
436 (struct iovec *)osi_AllocSmallSpace(sizeof(struct iovec) *
440 ("afs_MemCacheFetchProc: osi_AllocSmallSpace for iovecs returned NULL\n");
442 adc->validPos = abase;
446 code = rx_Read(acall, (char *)&length, sizeof(afs_int32));
447 length = ntohl(length);
449 if (code != sizeof(afs_int32)) {
450 code = rx_Error(acall);
451 osi_FreeSmallSpace(tiov);
452 return (code ? code : -1); /* try to return code, not -1 */
456 * The fetch protocol is extended for the AFS/DFS translator
457 * to allow multiple blocks of data, each with its own length,
458 * to be returned. As long as the top bit is set, there are more
461 * We do not do this for AFS file servers because they sometimes
462 * return large negative numbers as the transfer size.
464 if (avc->states & CForeign) {
465 moredata = length & 0x80000000;
466 length &= ~0x80000000;
471 (*abytesToXferP) += length;
472 #endif /* AFS_NOSTATS */
474 tlen = (length > AFS_LRALLOCSIZ ? AFS_LRALLOCSIZ : length);
476 code = rx_Readv(acall, tiov, &tnio, RX_MAXIOVECS, tlen);
479 (*abytesXferredP) += code;
480 #endif /* AFS_NOSTATS */
482 afs_Trace3(afs_iclSetp, CM_TRACE_FETCH64READ,
483 ICL_TYPE_POINTER, avc, ICL_TYPE_INT32, code,
484 ICL_TYPE_INT32, length);
485 osi_FreeSmallSpace(tiov);
489 afs_MemWritevBlk(mceP, offset, tiov, tnio, tlen);
493 adc->validPos = abase;
494 if (afs_osi_Wakeup(&adc->validPos) == 0)
495 afs_Trace4(afs_iclSetp, CM_TRACE_DCACHEWAKE, ICL_TYPE_STRING,
496 __FILE__, ICL_TYPE_INT32, __LINE__,
497 ICL_TYPE_POINTER, adc, ICL_TYPE_INT32,
501 /* max of two sizes */
502 osi_FreeSmallSpace(tiov);
508 shutdown_memcache(void)
512 if (cacheDiskType != AFS_FCACHE_TYPE_MEM)
514 memCacheBlkSize = 8192;
515 for (index = 0; index < memMaxBlkNumber; index++) {
516 LOCK_INIT(&((memCache + index)->afs_memLock), "afs_memLock");
517 afs_osi_Free((memCache + index)->data, (memCache + index)->dataSize);
519 afs_osi_Free((char *)memCache,
520 memMaxBlkNumber * sizeof(struct memCacheEntry));