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"
14 #include "afs/sysincludes.h" /* Standard vendor system headers */
15 #ifndef AFS_LINUX22_ENV
16 #include "rpc/types.h"
18 #include "afsincludes.h" /* Afs-based standard headers */
19 #include "afs/afs_stats.h" /* statistics */
21 /* memory cache routines */
22 static struct memCacheEntry *memCache;
23 static int memCacheBlkSize = 8192;
24 static int memMaxBlkNumber = 0;
26 extern int cacheDiskType;
29 afs_InitMemCache(int blkCount, int blkSize, int flags)
33 AFS_STATCNT(afs_InitMemCache);
35 memCacheBlkSize = blkSize;
37 memMaxBlkNumber = blkCount;
38 memCache = (struct memCacheEntry *)
39 afs_osi_Alloc(memMaxBlkNumber * sizeof(struct memCacheEntry));
41 for (index = 0; index < memMaxBlkNumber; index++) {
43 (memCache + index)->size = 0;
44 (memCache + index)->dataSize = memCacheBlkSize;
45 LOCK_INIT(&((memCache + index)->afs_memLock), "afs_memLock");
46 blk = afs_osi_Alloc(memCacheBlkSize);
49 (memCache + index)->data = blk;
50 memset((memCache + index)->data, 0, memCacheBlkSize);
52 #if defined(AFS_SGI62_ENV) || defined(AFS_HAVE_VXFS)
53 afs_InitDualFSCacheOps((struct vnode *)0);
59 printf("afsd: memCache allocation failure at %d KB.\n",
60 (index * memCacheBlkSize) / 1024);
61 while (--index >= 0) {
62 afs_osi_Free((memCache + index)->data, memCacheBlkSize);
63 (memCache + index)->data = NULL;
70 afs_MemCacheClose(struct osi_file *file)
76 afs_MemCacheOpen(afs_dcache_id_t *ainode)
78 struct memCacheEntry *mep;
80 if (ainode->mem < 0 || ainode->mem > memMaxBlkNumber) {
81 osi_Panic("afs_MemCacheOpen: invalid block #");
83 mep = (memCache + ainode->mem);
84 afs_Trace3(afs_iclSetp, CM_TRACE_MEMOPEN, ICL_TYPE_INT32, ainode->mem,
85 ICL_TYPE_POINTER, mep, ICL_TYPE_POINTER, mep ? mep->data : 0);
90 * this routine simulates a read in the Memory Cache
93 afs_MemReadBlk(register struct osi_file *fP, int offset, void *dest,
96 register struct memCacheEntry *mceP = (struct memCacheEntry *)fP;
99 ObtainReadLock(&mceP->afs_memLock);
100 AFS_STATCNT(afs_MemReadBlk);
102 ReleaseReadLock(&mceP->afs_memLock);
105 /* use min of bytes in buffer or requested size */
106 bytesRead = (size < mceP->size - offset) ? size : mceP->size - offset;
110 memcpy(dest, mceP->data + offset, bytesRead);
115 ReleaseReadLock(&mceP->afs_memLock);
120 * this routine simulates a readv in the Memory Cache
123 afs_MemReadvBlk(register struct memCacheEntry *mceP, int offset,
124 struct iovec *iov, int nio, int size)
130 ObtainReadLock(&mceP->afs_memLock);
131 AFS_STATCNT(afs_MemReadBlk);
133 ReleaseReadLock(&mceP->afs_memLock);
136 /* use min of bytes in buffer or requested size */
137 bytesRead = (size < mceP->size - offset) ? size : mceP->size - offset;
140 for (i = 0, size = bytesRead; i < nio && size > 0; i++) {
141 bytesToRead = (size < iov[i].iov_len) ? size : iov[i].iov_len;
143 memcpy(iov[i].iov_base, mceP->data + offset, bytesToRead);
145 offset += bytesToRead;
152 ReleaseReadLock(&mceP->afs_memLock);
157 afs_MemReadUIO(afs_dcache_id_t *ainode, struct uio *uioP)
159 register struct memCacheEntry *mceP =
160 (struct memCacheEntry *)afs_MemCacheOpen(ainode);
161 int length = mceP->size - AFS_UIO_OFFSET(uioP);
164 AFS_STATCNT(afs_MemReadUIO);
165 ObtainReadLock(&mceP->afs_memLock);
166 length = (length < AFS_UIO_RESID(uioP)) ? length : AFS_UIO_RESID(uioP);
167 AFS_UIOMOVE(mceP->data + AFS_UIO_OFFSET(uioP), length, UIO_READ, uioP, code);
168 ReleaseReadLock(&mceP->afs_memLock);
173 afs_MemWriteBlk(register struct osi_file *fP, int offset, void *src,
176 register struct memCacheEntry *mceP = (struct memCacheEntry *)fP;
181 return afs_MemWritevBlk(mceP, offset, &tiov, 1, size);
184 /*XXX: this extends a block arbitrarily to support big directories */
186 afs_MemWritevBlk(register struct memCacheEntry *mceP, int offset,
187 struct iovec *iov, int nio, int size)
192 AFS_STATCNT(afs_MemWriteBlk);
193 ObtainWriteLock(&mceP->afs_memLock, 561);
194 if (offset + size > mceP->dataSize) {
195 char *oldData = mceP->data;
197 mceP->data = afs_osi_Alloc(size + offset);
198 if (mceP->data == NULL) { /* no available memory */
199 mceP->data = oldData; /* revert back change that was made */
200 ReleaseWriteLock(&mceP->afs_memLock);
201 afs_warn("afs: afs_MemWriteBlk mem alloc failure (%d bytes)\n",
206 /* may overlap, but this is OK */
208 memcpy(mceP->data, oldData, mceP->size);
210 afs_osi_Free(oldData, mceP->dataSize);
211 mceP->dataSize = size + offset;
214 if (mceP->size < offset)
215 memset(mceP->data + mceP->size, 0, offset - mceP->size);
216 for (bytesWritten = 0, i = 0; i < nio && size > 0; i++) {
217 bytesToWrite = (size < iov[i].iov_len) ? size : iov[i].iov_len;
218 memcpy(mceP->data + offset, iov[i].iov_base, bytesToWrite);
219 offset += bytesToWrite;
220 bytesWritten += bytesToWrite;
221 size -= bytesToWrite;
223 mceP->size = (offset < mceP->size) ? mceP->size : offset;
226 ReleaseWriteLock(&mceP->afs_memLock);
231 afs_MemWriteUIO(afs_dcache_id_t *ainode, struct uio *uioP)
233 register struct memCacheEntry *mceP =
234 (struct memCacheEntry *)afs_MemCacheOpen(ainode);
237 AFS_STATCNT(afs_MemWriteUIO);
238 ObtainWriteLock(&mceP->afs_memLock, 312);
239 if (AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP) > mceP->dataSize) {
240 char *oldData = mceP->data;
242 mceP->data = afs_osi_Alloc(AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP));
243 if (mceP->data == NULL) { /* no available memory */
244 mceP->data = oldData; /* revert back change that was made */
245 ReleaseWriteLock(&mceP->afs_memLock);
246 afs_warn("afs: afs_MemWriteBlk mem alloc failure (%d bytes)\n",
247 AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP));
252 memcpy(mceP->data, oldData, mceP->size);
255 afs_osi_Free(oldData, mceP->dataSize);
256 mceP->dataSize = AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP);
258 if (mceP->size < AFS_UIO_OFFSET(uioP))
259 memset(mceP->data + mceP->size, 0,
260 (int)(AFS_UIO_OFFSET(uioP) - mceP->size));
261 AFS_UIOMOVE(mceP->data + AFS_UIO_OFFSET(uioP), AFS_UIO_RESID(uioP), UIO_WRITE,
263 if (AFS_UIO_OFFSET(uioP) > mceP->size)
264 mceP->size = AFS_UIO_OFFSET(uioP);
266 ReleaseWriteLock(&mceP->afs_memLock);
271 afs_MemCacheTruncate(register struct osi_file *fP, int size)
273 register struct memCacheEntry *mceP = (struct memCacheEntry *)fP;
274 AFS_STATCNT(afs_MemCacheTruncate);
276 ObtainWriteLock(&mceP->afs_memLock, 313);
277 /* old directory entry; g.c. */
278 if (size == 0 && mceP->dataSize > memCacheBlkSize) {
279 char *oldData = mceP->data;
280 mceP->data = afs_osi_Alloc(memCacheBlkSize);
281 if (mceP->data == NULL) { /* no available memory */
282 mceP->data = oldData;
283 ReleaseWriteLock(&mceP->afs_memLock);
284 afs_warn("afs: afs_MemWriteBlk mem alloc failure (%d bytes)\n",
287 afs_osi_Free(oldData, mceP->dataSize);
288 mceP->dataSize = memCacheBlkSize;
292 if (size < mceP->size)
295 ReleaseWriteLock(&mceP->afs_memLock);
301 shutdown_memcache(void)
305 if (cacheDiskType != AFS_FCACHE_TYPE_MEM)
307 memCacheBlkSize = 8192;
308 for (index = 0; index < memMaxBlkNumber; index++) {
309 LOCK_INIT(&((memCache + index)->afs_memLock), "afs_memLock");
310 afs_osi_Free((memCache + index)->data, (memCache + index)->dataSize);
312 afs_osi_Free((char *)memCache,
313 memMaxBlkNumber * sizeof(struct memCacheEntry));