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);
56 for (index = 0; index < blkCount; index++)
57 afs_InitCacheFile(NULL, 0);
61 afs_warn("afsd: memCache allocation failure at %d KB.\n",
62 (index * memCacheBlkSize) / 1024);
63 while (--index >= 0) {
64 afs_osi_Free((memCache + index)->data, memCacheBlkSize);
65 (memCache + index)->data = NULL;
72 afs_MemCacheClose(struct osi_file *file)
78 afs_MemCacheOpen(afs_dcache_id_t *ainode)
80 struct memCacheEntry *mep;
82 if (ainode->mem < 0 || ainode->mem > memMaxBlkNumber) {
83 osi_Panic("afs_MemCacheOpen: invalid block #");
85 mep = (memCache + ainode->mem);
86 afs_Trace3(afs_iclSetp, CM_TRACE_MEMOPEN, ICL_TYPE_INT32, ainode->mem,
87 ICL_TYPE_POINTER, mep, ICL_TYPE_POINTER, mep ? mep->data : 0);
92 * this routine simulates a read in the Memory Cache
95 afs_MemReadBlk(struct osi_file *fP, int offset, void *dest,
98 struct memCacheEntry *mceP = (struct memCacheEntry *)fP;
101 ObtainReadLock(&mceP->afs_memLock);
102 AFS_STATCNT(afs_MemReadBlk);
104 ReleaseReadLock(&mceP->afs_memLock);
107 /* use min of bytes in buffer or requested size */
108 bytesRead = (size < mceP->size - offset) ? size : mceP->size - offset;
112 memcpy(dest, mceP->data + offset, bytesRead);
117 ReleaseReadLock(&mceP->afs_memLock);
122 * this routine simulates a readv in the Memory Cache
125 afs_MemReadvBlk(struct memCacheEntry *mceP, int offset,
126 struct iovec *iov, int nio, int size)
132 ObtainReadLock(&mceP->afs_memLock);
133 AFS_STATCNT(afs_MemReadBlk);
135 ReleaseReadLock(&mceP->afs_memLock);
138 /* use min of bytes in buffer or requested size */
139 bytesRead = (size < mceP->size - offset) ? size : mceP->size - offset;
142 for (i = 0, size = bytesRead; i < nio && size > 0; i++) {
143 bytesToRead = (size < iov[i].iov_len) ? size : iov[i].iov_len;
145 memcpy(iov[i].iov_base, mceP->data + offset, bytesToRead);
147 offset += bytesToRead;
154 ReleaseReadLock(&mceP->afs_memLock);
159 afs_MemReadUIO(afs_dcache_id_t *ainode, struct uio *uioP)
161 struct memCacheEntry *mceP =
162 (struct memCacheEntry *)afs_MemCacheOpen(ainode);
163 int length = mceP->size - AFS_UIO_OFFSET(uioP);
166 AFS_STATCNT(afs_MemReadUIO);
167 ObtainReadLock(&mceP->afs_memLock);
168 length = (length < AFS_UIO_RESID(uioP)) ? length : AFS_UIO_RESID(uioP);
169 AFS_UIOMOVE(mceP->data + AFS_UIO_OFFSET(uioP), length, UIO_READ, uioP, code);
170 ReleaseReadLock(&mceP->afs_memLock);
175 afs_MemWriteBlk(struct osi_file *fP, int offset, void *src,
178 struct memCacheEntry *mceP = (struct memCacheEntry *)fP;
183 return afs_MemWritevBlk(mceP, offset, &tiov, 1, size);
186 /*XXX: this extends a block arbitrarily to support big directories */
188 afs_MemWritevBlk(struct memCacheEntry *mceP, int offset,
189 struct iovec *iov, int nio, int size)
194 AFS_STATCNT(afs_MemWriteBlk);
195 ObtainWriteLock(&mceP->afs_memLock, 561);
196 if (offset + size > mceP->dataSize) {
197 char *oldData = mceP->data;
199 mceP->data = afs_osi_Alloc(size + offset);
200 if (mceP->data == NULL) { /* no available memory */
201 mceP->data = oldData; /* revert back change that was made */
202 ReleaseWriteLock(&mceP->afs_memLock);
203 afs_warn("afs: afs_MemWriteBlk mem alloc failure (%d bytes)\n",
208 /* may overlap, but this is OK */
210 memcpy(mceP->data, oldData, mceP->size);
212 afs_osi_Free(oldData, mceP->dataSize);
213 mceP->dataSize = size + offset;
216 if (mceP->size < offset)
217 memset(mceP->data + mceP->size, 0, offset - mceP->size);
218 for (bytesWritten = 0, i = 0; i < nio && size > 0; i++) {
219 bytesToWrite = (size < iov[i].iov_len) ? size : iov[i].iov_len;
220 memcpy(mceP->data + offset, iov[i].iov_base, bytesToWrite);
221 offset += bytesToWrite;
222 bytesWritten += bytesToWrite;
223 size -= bytesToWrite;
225 mceP->size = (offset < mceP->size) ? mceP->size : offset;
228 ReleaseWriteLock(&mceP->afs_memLock);
233 afs_MemWriteUIO(struct vcache *avc, afs_dcache_id_t *ainode, struct uio *uioP)
235 struct memCacheEntry *mceP =
236 (struct memCacheEntry *)afs_MemCacheOpen(ainode);
239 AFS_STATCNT(afs_MemWriteUIO);
240 ObtainWriteLock(&mceP->afs_memLock, 312);
241 if (AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP) > mceP->dataSize) {
242 char *oldData = mceP->data;
244 mceP->data = afs_osi_Alloc(AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP));
245 if (mceP->data == NULL) { /* no available memory */
246 mceP->data = oldData; /* revert back change that was made */
247 ReleaseWriteLock(&mceP->afs_memLock);
248 afs_warn("afs: afs_MemWriteBlk mem alloc failure (%ld bytes)\n",
249 (long)(AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP)));
254 memcpy(mceP->data, oldData, mceP->size);
257 afs_osi_Free(oldData, mceP->dataSize);
258 mceP->dataSize = AFS_UIO_RESID(uioP) + AFS_UIO_OFFSET(uioP);
260 if (mceP->size < AFS_UIO_OFFSET(uioP))
261 memset(mceP->data + mceP->size, 0,
262 (int)(AFS_UIO_OFFSET(uioP) - mceP->size));
263 AFS_UIOMOVE(mceP->data + AFS_UIO_OFFSET(uioP), AFS_UIO_RESID(uioP), UIO_WRITE,
265 if (AFS_UIO_OFFSET(uioP) > mceP->size)
266 mceP->size = AFS_UIO_OFFSET(uioP);
268 ReleaseWriteLock(&mceP->afs_memLock);
273 afs_MemCacheTruncate(struct osi_file *fP, int size)
275 struct memCacheEntry *mceP = (struct memCacheEntry *)fP;
276 AFS_STATCNT(afs_MemCacheTruncate);
278 ObtainWriteLock(&mceP->afs_memLock, 313);
279 /* old directory entry; g.c. */
280 if (size == 0 && mceP->dataSize > memCacheBlkSize) {
281 char *oldData = mceP->data;
282 mceP->data = afs_osi_Alloc(memCacheBlkSize);
283 if (mceP->data == NULL) { /* no available memory */
284 mceP->data = oldData;
285 ReleaseWriteLock(&mceP->afs_memLock);
286 afs_warn("afs: afs_MemWriteBlk mem alloc failure (%d bytes)\n",
289 afs_osi_Free(oldData, mceP->dataSize);
290 mceP->dataSize = memCacheBlkSize;
294 if (size < mceP->size)
297 ReleaseWriteLock(&mceP->afs_memLock);
303 shutdown_memcache(void)
307 if (cacheDiskType != AFS_FCACHE_TYPE_MEM)
309 memCacheBlkSize = 8192;
310 for (index = 0; index < memMaxBlkNumber; index++) {
311 LOCK_INIT(&((memCache + index)->afs_memLock), "afs_memLock");
312 afs_osi_Free((memCache + index)->data, (memCache + index)->dataSize);
314 afs_osi_Free((char *)memCache,
315 memMaxBlkNumber * sizeof(struct memCacheEntry));