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;
39 afs_osi_Alloc(memMaxBlkNumber * sizeof(struct memCacheEntry));
40 osi_Assert(memCache != NULL);
42 for (index = 0; index < memMaxBlkNumber; index++) {
44 (memCache + index)->size = 0;
45 (memCache + index)->dataSize = memCacheBlkSize;
46 LOCK_INIT(&((memCache + index)->afs_memLock), "afs_memLock");
47 blk = afs_osi_Alloc(memCacheBlkSize);
50 (memCache + index)->data = blk;
51 memset((memCache + index)->data, 0, memCacheBlkSize);
53 #if defined(AFS_HAVE_VXFS)
54 afs_InitDualFSCacheOps((struct vnode *)0);
60 afs_warn("afsd: memCache allocation failure at %d KB.\n",
61 (index * memCacheBlkSize) / 1024);
62 while (--index >= 0) {
63 afs_osi_Free((memCache + index)->data, memCacheBlkSize);
64 (memCache + index)->data = NULL;
71 afs_MemCacheClose(struct osi_file *file)
77 afs_MemCacheOpen(afs_dcache_id_t *ainode)
79 struct memCacheEntry *mep;
81 if (ainode->mem < 0 || ainode->mem > memMaxBlkNumber) {
82 osi_Panic("afs_MemCacheOpen: invalid block #");
84 mep = (memCache + ainode->mem);
85 afs_Trace3(afs_iclSetp, CM_TRACE_MEMOPEN, ICL_TYPE_INT32, ainode->mem,
86 ICL_TYPE_POINTER, mep, ICL_TYPE_POINTER, mep ? mep->data : 0);
91 * this routine simulates a read in the Memory Cache
94 afs_MemReadBlk(struct osi_file *fP, int offset, void *dest,
97 struct memCacheEntry *mceP = (struct memCacheEntry *)fP;
100 ObtainReadLock(&mceP->afs_memLock);
101 AFS_STATCNT(afs_MemReadBlk);
103 ReleaseReadLock(&mceP->afs_memLock);
106 /* use min of bytes in buffer or requested size */
107 bytesRead = (size < mceP->size - offset) ? size : mceP->size - offset;
111 memcpy(dest, mceP->data + offset, bytesRead);
116 ReleaseReadLock(&mceP->afs_memLock);
121 * this routine simulates a readv in the Memory Cache
124 afs_MemReadvBlk(struct memCacheEntry *mceP, int offset,
125 struct iovec *iov, int nio, int size)
131 ObtainReadLock(&mceP->afs_memLock);
132 AFS_STATCNT(afs_MemReadBlk);
134 ReleaseReadLock(&mceP->afs_memLock);
137 /* use min of bytes in buffer or requested size */
138 bytesRead = (size < mceP->size - offset) ? size : mceP->size - offset;
141 for (i = 0, size = bytesRead; i < nio && size > 0; i++) {
142 bytesToRead = (size < iov[i].iov_len) ? size : iov[i].iov_len;
144 memcpy(iov[i].iov_base, mceP->data + offset, bytesToRead);
146 offset += bytesToRead;
153 ReleaseReadLock(&mceP->afs_memLock);
158 afs_MemReadUIO(afs_dcache_id_t *ainode, struct uio *uioP)
160 struct memCacheEntry *mceP =
161 (struct memCacheEntry *)afs_MemCacheOpen(ainode);
162 int length = mceP->size - AFS_UIO_OFFSET(uioP);
165 AFS_STATCNT(afs_MemReadUIO);
166 ObtainReadLock(&mceP->afs_memLock);
167 length = (length < AFS_UIO_RESID(uioP)) ? length : AFS_UIO_RESID(uioP);
168 AFS_UIOMOVE(mceP->data + AFS_UIO_OFFSET(uioP), length, UIO_READ, uioP, code);
169 ReleaseReadLock(&mceP->afs_memLock);
174 afs_MemWriteBlk(struct osi_file *fP, int offset, void *src,
177 struct memCacheEntry *mceP = (struct memCacheEntry *)fP;
182 return afs_MemWritevBlk(mceP, offset, &tiov, 1, size);
185 /*XXX: this extends a block arbitrarily to support big directories */
187 afs_MemWritevBlk(struct memCacheEntry *mceP, int offset,
188 struct iovec *iov, int nio, int size)
193 AFS_STATCNT(afs_MemWriteBlk);
194 ObtainWriteLock(&mceP->afs_memLock, 561);
195 if (offset + size > mceP->dataSize) {
196 char *oldData = mceP->data;
198 mceP->data = afs_osi_Alloc(size + offset);
199 if (mceP->data == NULL) { /* no available memory */
200 mceP->data = oldData; /* revert back change that was made */
201 ReleaseWriteLock(&mceP->afs_memLock);
202 afs_warn("afs: afs_MemWriteBlk mem alloc failure (%d bytes)\n",
207 /* may overlap, but this is OK */
209 memcpy(mceP->data, oldData, mceP->size);
211 afs_osi_Free(oldData, mceP->dataSize);
212 mceP->dataSize = size + offset;
215 if (mceP->size < offset)
216 memset(mceP->data + mceP->size, 0, offset - mceP->size);
217 for (bytesWritten = 0, i = 0; i < nio && size > 0; i++) {
218 bytesToWrite = (size < iov[i].iov_len) ? size : iov[i].iov_len;
219 memcpy(mceP->data + offset, iov[i].iov_base, bytesToWrite);
220 offset += bytesToWrite;
221 bytesWritten += bytesToWrite;
222 size -= bytesToWrite;
224 mceP->size = (offset < mceP->size) ? mceP->size : offset;
227 ReleaseWriteLock(&mceP->afs_memLock);
232 afs_MemWriteUIO(afs_dcache_id_t *ainode, struct uio *uioP)
234 struct memCacheEntry *mceP =
235 (struct memCacheEntry *)afs_MemCacheOpen(ainode);
238 AFS_STATCNT(afs_MemWriteUIO);
239 ObtainWriteLock(&mceP->afs_memLock, 312);
240 if (AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP) > mceP->dataSize) {
241 char *oldData = mceP->data;
243 mceP->data = afs_osi_Alloc(AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP));
244 if (mceP->data == NULL) { /* no available memory */
245 mceP->data = oldData; /* revert back change that was made */
246 ReleaseWriteLock(&mceP->afs_memLock);
247 afs_warn("afs: afs_MemWriteBlk mem alloc failure (%ld bytes)\n",
248 (long)(AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP)));
253 memcpy(mceP->data, oldData, mceP->size);
256 afs_osi_Free(oldData, mceP->dataSize);
257 mceP->dataSize = AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP);
259 if (mceP->size < AFS_UIO_OFFSET(uioP))
260 memset(mceP->data + mceP->size, 0,
261 (int)(AFS_UIO_OFFSET(uioP) - mceP->size));
262 AFS_UIOMOVE(mceP->data + AFS_UIO_OFFSET(uioP), AFS_UIO_RESID(uioP), UIO_WRITE,
264 if (AFS_UIO_OFFSET(uioP) > mceP->size)
265 mceP->size = AFS_UIO_OFFSET(uioP);
267 ReleaseWriteLock(&mceP->afs_memLock);
272 afs_MemCacheTruncate(struct osi_file *fP, int size)
274 struct memCacheEntry *mceP = (struct memCacheEntry *)fP;
275 AFS_STATCNT(afs_MemCacheTruncate);
277 ObtainWriteLock(&mceP->afs_memLock, 313);
278 /* old directory entry; g.c. */
279 if (size == 0 && mceP->dataSize > memCacheBlkSize) {
280 char *oldData = mceP->data;
281 mceP->data = afs_osi_Alloc(memCacheBlkSize);
282 if (mceP->data == NULL) { /* no available memory */
283 mceP->data = oldData;
284 ReleaseWriteLock(&mceP->afs_memLock);
285 afs_warn("afs: afs_MemWriteBlk mem alloc failure (%d bytes)\n",
288 afs_osi_Free(oldData, mceP->dataSize);
289 mceP->dataSize = memCacheBlkSize;
293 if (size < mceP->size)
296 ReleaseWriteLock(&mceP->afs_memLock);
302 shutdown_memcache(void)
306 if (cacheDiskType != AFS_FCACHE_TYPE_MEM)
308 memCacheBlkSize = 8192;
309 for (index = 0; index < memMaxBlkNumber; index++) {
310 LOCK_INIT(&((memCache + index)->afs_memLock), "afs_memLock");
311 afs_osi_Free((memCache + index)->data, (memCache + index)->dataSize);
313 afs_osi_Free((char *)memCache,
314 memMaxBlkNumber * sizeof(struct memCacheEntry));