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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" /* afs statistics */ | |
17 | #include "afs/osi_inode.h" /* igetinode() */ | |
18 | ||
19 | ||
20 | int afs_osicred_initialized = 0; | |
21 | afs_ucred_t afs_osi_cred; | |
22 | extern struct osi_dev cacheDev; | |
23 | extern struct vfs *afs_cacheVfsp; | |
24 | ||
25 | ||
26 | void * | |
27 | osi_UFSOpen(afs_dcache_id_t *ainode) | |
28 | { | |
29 | struct inode *ip; | |
30 | struct osi_file *afile = NULL; | |
31 | extern int cacheDiskType; | |
32 | afs_int32 code = 0; | |
33 | int dummy; | |
34 | AFS_STATCNT(osi_UFSOpen); | |
35 | if (cacheDiskType != AFS_FCACHE_TYPE_UFS) { | |
36 | osi_Panic("UFSOpen called for non-UFS cache\n"); | |
37 | } | |
38 | if (!afs_osicred_initialized) { | |
39 | /* valid for alpha_osf, SunOS, Ultrix */ | |
40 | memset(&afs_osi_cred, 0, sizeof(afs_ucred_t)); | |
41 | crhold(&afs_osi_cred); /* don't let it evaporate, since it is static */ | |
42 | afs_osicred_initialized = 1; | |
43 | } | |
44 | afile = osi_AllocSmallSpace(sizeof(struct osi_file)); | |
45 | setuerror(0); | |
46 | AFS_GUNLOCK(); | |
47 | ip = (struct inode *)igetinode(afs_cacheVfsp, (dev_t) cacheDev.dev, | |
48 | (ino_t) ainode->ufs, &dummy); | |
49 | AFS_GLOCK(); | |
50 | if (getuerror()) { | |
51 | osi_FreeSmallSpace(afile); | |
52 | osi_Panic("UFSOpen: igetinode failed"); | |
53 | } | |
54 | iunlock(ip); | |
55 | afile->vnode = ITOV(ip); | |
56 | afile->size = VTOI(afile->vnode)->i_size; | |
57 | afile->offset = 0; | |
58 | afile->proc = (int (*)())0; | |
59 | return (void *)afile; | |
60 | } | |
61 | ||
62 | int | |
63 | afs_osi_Stat(struct osi_file *afile, struct osi_stat *astat) | |
64 | { | |
65 | afs_int32 code; | |
66 | struct vattr tvattr; | |
67 | AFS_STATCNT(osi_Stat); | |
68 | AFS_GUNLOCK(); | |
69 | code = VOP_GETATTR(afile->vnode, &tvattr, &afs_osi_cred, VSYNC); | |
70 | AFS_GLOCK(); | |
71 | if (code == 0) { | |
72 | astat->size = tvattr.va_size; | |
73 | astat->mtime = tvattr.va_mtime.tv_sec; | |
74 | astat->atime = tvattr.va_atime.tv_sec; | |
75 | } | |
76 | return code; | |
77 | } | |
78 | ||
79 | int | |
80 | osi_UFSClose(struct osi_file *afile) | |
81 | { | |
82 | AFS_STATCNT(osi_Close); | |
83 | if (afile->vnode) { | |
84 | AFS_RELE(afile->vnode); | |
85 | } | |
86 | ||
87 | osi_FreeSmallSpace(afile); | |
88 | return 0; | |
89 | } | |
90 | ||
91 | int | |
92 | osi_UFSTruncate(struct osi_file *afile, afs_int32 asize) | |
93 | { | |
94 | afs_ucred_t *oldCred; | |
95 | struct vattr tvattr; | |
96 | afs_int32 code; | |
97 | struct osi_stat tstat; | |
98 | AFS_STATCNT(osi_Truncate); | |
99 | ||
100 | /* This routine only shrinks files, and most systems | |
101 | * have very slow truncates, even when the file is already | |
102 | * small enough. Check now and save some time. | |
103 | */ | |
104 | code = afs_osi_Stat(afile, &tstat); | |
105 | if (code || tstat.size <= asize) | |
106 | return code; | |
107 | VATTR_NULL(&tvattr); | |
108 | /* note that this credential swapping stuff is only necessary because | |
109 | * of ufs's references directly to u.u_cred instead of to | |
110 | * credentials parameter. Probably should fix ufs some day. */ | |
111 | oldCred = p_cred(u.u_procp); | |
112 | set_p_cred(u.u_procp, &afs_osi_cred); | |
113 | tvattr.va_size = asize; | |
114 | AFS_GUNLOCK(); | |
115 | code = VOP_SETATTR(afile->vnode, &tvattr, &afs_osi_cred, 0); | |
116 | AFS_GLOCK(); | |
117 | set_p_cred(u.u_procp, oldCred); /* restore */ | |
118 | return code; | |
119 | } | |
120 | ||
121 | void | |
122 | osi_DisableAtimes(struct vnode *avp) | |
123 | { | |
124 | struct inode *ip = VTOI(avp); | |
125 | ip->i_flag &= ~IACC; | |
126 | } | |
127 | ||
128 | ||
129 | /* Generic read interface */ | |
130 | int | |
131 | afs_osi_Read(struct osi_file *afile, int offset, void *aptr, | |
132 | afs_int32 asize) | |
133 | { | |
134 | afs_ucred_t *oldCred; | |
135 | long resid; | |
136 | afs_int32 code; | |
137 | afs_int32 cnt1 = 0; | |
138 | AFS_STATCNT(osi_Read); | |
139 | ||
140 | /** | |
141 | * If the osi_file passed in is NULL, panic only if AFS is not shutting | |
142 | * down. No point in crashing when we are already shutting down | |
143 | */ | |
144 | if (!afile) { | |
145 | if (afs_shuttingdown == AFS_RUNNING) | |
146 | osi_Panic("osi_Read called with null param"); | |
147 | else | |
148 | return -EIO; | |
149 | } | |
150 | ||
151 | if (offset != -1) | |
152 | afile->offset = offset; | |
153 | retry_IO: | |
154 | AFS_GUNLOCK(); | |
155 | code = | |
156 | gop_rdwr(UIO_READ, afile->vnode, (caddr_t) aptr, asize, afile->offset, | |
157 | AFS_UIOSYS, IO_UNIT, &resid); | |
158 | AFS_GLOCK(); | |
159 | if (code == 0) { | |
160 | code = asize - resid; | |
161 | afile->offset += code; | |
162 | osi_DisableAtimes(afile->vnode); | |
163 | } else { | |
164 | afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32, | |
165 | (afs_int32) resid, ICL_TYPE_INT32, code); | |
166 | /* | |
167 | * To handle periodic low-level EFAULT failures that we've seen with the | |
168 | * Weitek chip; in all observed failed cases a second read succeeded. | |
169 | */ | |
170 | if ((code == EFAULT) && (cnt1++ < 5)) { | |
171 | afs_stats_cmperf.osiread_efaults++; | |
172 | goto retry_IO; | |
173 | } | |
174 | setuerror(code); | |
175 | if (code > 0) { | |
176 | code = -code; | |
177 | } | |
178 | } | |
179 | return code; | |
180 | } | |
181 | ||
182 | /* Generic write interface */ | |
183 | int | |
184 | afs_osi_Write(struct osi_file *afile, afs_int32 offset, void *aptr, | |
185 | afs_int32 asize) | |
186 | { | |
187 | afs_ucred_t *oldCred; | |
188 | long resid; | |
189 | afs_int32 code; | |
190 | AFS_STATCNT(osi_Write); | |
191 | if (!afile) | |
192 | osi_Panic("afs_osi_Write called with null param"); | |
193 | if (offset != -1) | |
194 | afile->offset = offset; | |
195 | AFS_GUNLOCK(); | |
196 | code = | |
197 | gop_rdwr(UIO_WRITE, afile->vnode, (caddr_t) aptr, asize, | |
198 | afile->offset, AFS_UIOSYS, IO_UNIT, &resid); | |
199 | AFS_GLOCK(); | |
200 | if (code == 0) { | |
201 | code = asize - resid; | |
202 | afile->offset += code; | |
203 | } else { | |
204 | if (code == ENOSPC) | |
205 | afs_WarnENOSPC(); | |
206 | setuerror(code); | |
207 | if (code > 0) { | |
208 | code = -code; | |
209 | } | |
210 | } | |
211 | if (afile->proc) { | |
212 | (*afile->proc) (afile, code); | |
213 | } | |
214 | return code; | |
215 | } | |
216 | ||
217 | ||
218 | void | |
219 | shutdown_osifile(void) | |
220 | { | |
221 | AFS_STATCNT(shutdown_osifile); | |
222 | if (afs_cold_shutdown) { | |
223 | afs_osicred_initialized = 0; | |
224 | } | |
225 | } |