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805e021f CE |
1 | /* |
2 | * Copyright 2000, International Business Machines Corporation and others. | |
3 | * All Rights Reserved. | |
4 | * | |
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 | |
8 | */ | |
9 | ||
10 | #include <afsconfig.h> | |
11 | #include "afs/param.h" | |
12 | ||
13 | ||
14 | #include "afs/sysincludes.h" /* Standard vendor system headers */ | |
15 | #include "afsincludes.h" /* Afs-based standard headers */ | |
16 | #include "afs/afs_stats.h" /* statistics */ | |
17 | #include "afs/afs_cbqueue.h" | |
18 | #include "afs/nfsclient.h" | |
19 | #include "afs/afs_osidnlc.h" | |
20 | ||
21 | ||
22 | /* | |
23 | * UIO routines | |
24 | */ | |
25 | ||
26 | #ifndef AFS_DARWIN80_ENV | |
27 | /* routine to make copy of uio structure in ainuio, using aoutvec for space */ | |
28 | int | |
29 | afsio_copy(struct uio *ainuio, struct uio *aoutuio, | |
30 | struct iovec *aoutvec) | |
31 | { | |
32 | int i; | |
33 | struct iovec *tvec; | |
34 | ||
35 | AFS_STATCNT(afsio_copy); | |
36 | if (ainuio->afsio_iovcnt > AFS_MAXIOVCNT) | |
37 | return EINVAL; | |
38 | memcpy((char *)aoutuio, (char *)ainuio, sizeof(struct uio)); | |
39 | tvec = ainuio->afsio_iov; | |
40 | aoutuio->afsio_iov = aoutvec; | |
41 | for (i = 0; i < ainuio->afsio_iovcnt; i++) { | |
42 | memcpy((char *)aoutvec, (char *)tvec, sizeof(struct iovec)); | |
43 | tvec++; /* too many compiler bugs to do this as one expr */ | |
44 | aoutvec++; | |
45 | } | |
46 | return 0; | |
47 | } | |
48 | ||
49 | /* trim the uio structure to the specified size */ | |
50 | int | |
51 | afsio_trim(struct uio *auio, afs_int32 asize) | |
52 | { | |
53 | int i; | |
54 | struct iovec *tv; | |
55 | ||
56 | AFS_STATCNT(afsio_trim); | |
57 | auio->afsio_resid = asize; | |
58 | tv = auio->afsio_iov; | |
59 | /* It isn't clear that multiple iovecs work ok (hasn't been tested!) */ | |
60 | for (i = 0;; i++, tv++) { | |
61 | if (i >= auio->afsio_iovcnt || asize <= 0) { | |
62 | /* we're done */ | |
63 | auio->afsio_iovcnt = i; | |
64 | break; | |
65 | } | |
66 | if (tv->iov_len <= asize) | |
67 | /* entire iovec is included */ | |
68 | asize -= tv->iov_len; /* this many fewer bytes */ | |
69 | else { | |
70 | /* this is the last one */ | |
71 | tv->iov_len = asize; | |
72 | auio->afsio_iovcnt = i + 1; | |
73 | break; | |
74 | } | |
75 | } | |
76 | return 0; | |
77 | } | |
78 | ||
79 | /* Allocate space for, then partially copy, over an existing iovec up to the | |
80 | * length given in len. | |
81 | * | |
82 | * This requires that SmallSpace can alloc space big enough to hold a struct | |
83 | * UIO, plus 16 iovecs | |
84 | */ | |
85 | ||
86 | struct uio * | |
87 | afsio_partialcopy(struct uio *auio, size_t len) { | |
88 | char *space; | |
89 | struct uio *newuio; | |
90 | struct iovec *newvec; | |
91 | size_t space_len = sizeof(struct uio) + | |
92 | sizeof(struct iovec) * AFS_MAXIOVCNT; | |
93 | ||
94 | /* Allocate a block that can contain both the UIO and the iovec */ | |
95 | space = osi_AllocSmallSpace(space_len); | |
96 | memset(space, 0, space_len); | |
97 | ||
98 | newuio = (struct uio *) space; | |
99 | newvec = (struct iovec *) (space + sizeof(struct uio)); | |
100 | ||
101 | afsio_copy(auio, newuio, newvec); | |
102 | afsio_trim(newuio, len); | |
103 | ||
104 | return newuio; | |
105 | } | |
106 | ||
107 | void | |
108 | afsio_free(struct uio *uio) { | |
109 | osi_FreeSmallSpace(uio); | |
110 | } | |
111 | #endif | |
112 | ||
113 | /* skip asize bytes in the current uio structure */ | |
114 | int | |
115 | afsio_skip(struct uio *auio, afs_int32 asize) | |
116 | { | |
117 | struct iovec *tv; /* pointer to current iovec */ | |
118 | int cnt; | |
119 | ||
120 | AFS_STATCNT(afsio_skip); | |
121 | #ifdef AFS_DARWIN80_ENV | |
122 | uio_update(auio, asize); | |
123 | #else | |
124 | /* It isn't guaranteed that multiple iovecs work ok (hasn't been tested!) */ | |
125 | while (asize > 0 && auio->afsio_resid) { | |
126 | tv = auio->afsio_iov; | |
127 | cnt = tv->iov_len; | |
128 | if (cnt == 0) { | |
129 | auio->afsio_iov++; | |
130 | auio->afsio_iovcnt--; | |
131 | continue; | |
132 | } | |
133 | if (cnt > asize) | |
134 | cnt = asize; | |
135 | tv->iov_base = (char *)(tv->iov_base) + cnt; | |
136 | tv->iov_len -= cnt; | |
137 | auio->uio_resid -= cnt; | |
138 | auio->afsio_offset += cnt; | |
139 | asize -= cnt; | |
140 | } | |
141 | #endif | |
142 | return 0; | |
143 | } |