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
11 #define AFS_CHUNKOPS 1
13 /* macros to compute useful numbers from offsets. AFS_CHUNK gives the chunk
14 number for a given offset; AFS_CHUNKOFFSET gives the offset into the chunk
15 and AFS_CHUNKBASE gives the byte offset of the base of the chunk.
16 AFS_CHUNKSIZE gives the size of the chunk containing an offset.
17 AFS_CHUNKTOBASE converts a chunk # to a base position.
18 Chunks are 0 based and go up by exactly 1, covering the file.
19 The other fields are internal and shouldn't be used */
20 /* basic parameters */
23 #define AFS_OTHERCSIZE 0x10000
24 #define AFS_LOGCHUNK 16
25 #define AFS_FIRSTCSIZE 0x40000000
27 #else /* AFS_NOCHUNKING */
29 #define AFS_OTHERCSIZE (afs_OtherCSize)
30 #define AFS_LOGCHUNK (afs_LogChunk)
31 #define AFS_FIRSTCSIZE (afs_FirstCSize)
33 #define AFS_DEFAULTCSIZE 0x10000
34 #define AFS_DEFAULTLSIZE 16
36 #endif /* AFS_NOCHUNKING */
38 #define AFS_MINCHUNK 13 /* 8k is minimum */
39 #define AFS_MAXCHUNK 18 /* 256K is maximum */
41 #define AFS_CHUNKOFFSET(offset) ((offset < afs_FirstCSize) ? offset : \
42 ((offset - afs_FirstCSize) & (afs_OtherCSize - 1)))
44 #define AFS_CHUNK(offset) ((offset < afs_FirstCSize) ? 0 : \
45 (((offset - afs_FirstCSize) >> afs_LogChunk) + 1))
47 #define AFS_CHUNKBASE(offset) ((offset < afs_FirstCSize) ? 0 : \
48 (((offset - afs_FirstCSize) & ~(afs_OtherCSize - 1)) + afs_FirstCSize))
50 #define AFS_CHUNKSIZE(offset) ((offset < afs_FirstCSize) ? afs_FirstCSize : \
53 #define AFS_CHUNKTOBASE(chunk) ((chunk == 0) ? 0 : \
54 ((afs_size_t) afs_FirstCSize + ((afs_size_t) (chunk - 1) << afs_LogChunk)))
56 #define AFS_CHUNKTOSIZE(chunk) ((chunk == 0) ? afs_FirstCSize : afs_OtherCSize)
58 /* sizes are a power of two */
59 #define AFS_SETCHUNKSIZE(chunk) { afs_LogChunk = chunk; \
60 afs_FirstCSize = afs_OtherCSize = (1 << chunk); }
63 * Functions exported by a cache type
67 void *(*open)(afs_int32 ainode);
68 int (*truncate)(struct osi_file *fp, int len);
69 int (*fread)(struct osi_file *fp, int offset, char *buf, int len);
70 int (*fwrite)(struct osi_file *fp, int offset, char *buf, int len);
71 int (*close)(struct osi_file *fp);
72 int (*vread)(register struct vcache *avc, struct uio *auio,
73 struct AFS_UCRED *acred, daddr_t albn, struct buf **abpp, int noLock);
74 int (*vwrite)(register struct vcache *avc, struct uio *auio,
75 int aio, struct AFS_UCRED *acred, int noLock);
76 int (*FetchProc)(register struct rx_call *acall,
77 struct osi_file *afile, afs_size_t abase, struct dcache *adc,
78 struct vcache *avc, afs_size_t *abytesToXferP,
79 afs_size_t *abytesXferredP, afs_int32 lengthFound);
80 int (*StoreProc)(register struct rx_call *acall,
81 struct osi_file *afile, register afs_int32 alen, struct vcache *avc,
82 int *shouldWake, afs_size_t *abytesToXferP, afs_size_t *abytesXferredP);
83 struct dcache *(*GetDSlot)(register afs_int32 aslot, register struct dcache *tmpdc);
84 struct volume *(*GetVolSlot)(void);
85 int (*HandleLink)(register struct vcache *avc, struct vrequest *areq);
88 /* Ideally we should have used consistent naming - like COP_OPEN, COP_TRUNCATE, etc. */
89 #define afs_CFileOpen(inode) (void *)(*(afs_cacheType->open))(inode)
90 #define afs_CFileTruncate(handle, size) (*(afs_cacheType->truncate))((handle), size)
91 #define afs_CFileRead(file, offset, data, size) (*(afs_cacheType->fread))(file, offset, data, size)
92 #define afs_CFileWrite(file, offset, data, size) (*(afs_cacheType->fwrite))(file, offset, data, size)
93 #define afs_CFileClose(handle) (*(afs_cacheType->close))(handle)
94 #define afs_GetDSlot(slot, adc) (*(afs_cacheType->GetDSlot))(slot, adc)
95 #define afs_GetVolSlot() (*(afs_cacheType->GetVolSlot))()
96 #define afs_HandleLink(avc, areq) (*(afs_cacheType->HandleLink))(avc, areq)
98 #define afs_CacheFetchProc(call, file, base, adc, avc, toxfer, xfered, length) \
99 (*(afs_cacheType->FetchProc))(call, file, (afs_size_t)base, adc, avc, (afs_size_t *)toxfer, (afs_size_t *)xfered, length)
100 #define afs_CacheStoreProc(call, file, bytes, avc, wake, toxfer, xfered) \
101 (*(afs_cacheType->StoreProc))(call, file, bytes, avc, wake, toxfer, xfered)
103 #endif /* AFS_CHUNKOPS */