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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 | ||
18 | ||
19 | int afs_osicred_initialized = 0; | |
20 | afs_ucred_t afs_osi_cred; | |
21 | extern struct osi_dev cacheDev; | |
22 | extern struct vfs *afs_cacheVfsp; | |
23 | ||
24 | ||
25 | void * | |
26 | osi_UFSOpen(afs_dcache_id_t *ainode) | |
27 | { | |
28 | struct inode *ip; | |
29 | struct osi_file *afile = NULL; | |
30 | struct vnode *vp = 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((dev_t) cacheDev.dev, afs_cacheVfsp, | |
48 | (ino_t) ainode->ufs, &vp, &dummy); | |
49 | AFS_GLOCK(); | |
50 | if (getuerror()) { | |
51 | osi_FreeSmallSpace(afile); | |
52 | osi_Panic("UFSOpen: igetinode failed"); | |
53 | } | |
54 | afile->vnode = vp; /* Save the vnode pointer for the inode ip; also ip is already prele'ed in igetinode */ | |
55 | afile->size = VTOI(afile->vnode)->i_size; | |
56 | afile->offset = 0; | |
57 | afile->proc = (int (*)())0; | |
58 | return (void *)afile; | |
59 | } | |
60 | ||
61 | int | |
62 | afs_osi_Stat(struct osi_file *afile, struct osi_stat *astat) | |
63 | { | |
64 | afs_int32 code; | |
65 | struct vattr tvattr; | |
66 | AFS_STATCNT(osi_Stat); | |
67 | AFS_GUNLOCK(); | |
68 | code = VNOP_GETATTR(afile->vnode, &tvattr, &afs_osi_cred); | |
69 | AFS_GLOCK(); | |
70 | if (code == 0) { | |
71 | astat->size = tvattr.va_size; | |
72 | astat->mtime = tvattr.va_mtime.tv_sec; | |
73 | astat->atime = tvattr.va_atime.tv_sec; | |
74 | } | |
75 | return code; | |
76 | } | |
77 | ||
78 | int | |
79 | osi_UFSClose(struct osi_file *afile) | |
80 | { | |
81 | AFS_STATCNT(osi_Close); | |
82 | if (afile->vnode) { | |
83 | /* AIX writes entire data regions at a time when dumping core. We've | |
84 | * seen a 26M write go through the system. When this happens, we run | |
85 | * out of available pages. So, we'll flush the vnode's vm if we're short | |
86 | * on space. | |
87 | */ | |
88 | if (vmPageHog) { | |
89 | int code; | |
90 | if (afile->vnode->v_gnode->gn_seg) { | |
91 | /* 524287 is the max number of pages for a file. See test in | |
92 | * vm_writep. | |
93 | */ | |
94 | code = vm_writep(afile->vnode->v_gnode->gn_seg, 0, 524287); | |
95 | } | |
96 | } | |
97 | AFS_RELE(afile->vnode); | |
98 | } | |
99 | ||
100 | osi_FreeSmallSpace(afile); | |
101 | return 0; | |
102 | } | |
103 | ||
104 | int | |
105 | osi_UFSTruncate(struct osi_file *afile, afs_int32 asize) | |
106 | { | |
107 | afs_ucred_t *oldCred; | |
108 | struct vattr tvattr; | |
109 | afs_int32 code; | |
110 | struct osi_stat tstat; | |
111 | afs_int32 mode = FWRITE | FSYNC; | |
112 | AFS_STATCNT(osi_Truncate); | |
113 | ||
114 | /* This routine only shrinks files, and most systems | |
115 | * have very slow truncates, even when the file is already | |
116 | * small enough. Check now and save some time. | |
117 | */ | |
118 | code = afs_osi_Stat(afile, &tstat); | |
119 | if (code || tstat.size <= asize) | |
120 | return code; | |
121 | /* | |
122 | * If we're truncating an unopened file to a non-zero length, | |
123 | * we need to bind it to a vm segment | |
124 | * Note that that the binding will actually happen inside | |
125 | * jfs by xix_ftrunc; setting mode to 0 will enable that. | |
126 | */ | |
127 | if (asize && !VTOGP(afile->vnode)->gn_seg) | |
128 | mode = 0; | |
129 | AFS_GUNLOCK(); | |
130 | code = VNOP_FTRUNC(afile->vnode, mode, asize, (caddr_t) 0, &afs_osi_cred); | |
131 | AFS_GLOCK(); | |
132 | return code; | |
133 | } | |
134 | ||
135 | void | |
136 | osi_DisableAtimes(struct vnode *avp) | |
137 | { | |
138 | struct inode *ip = VTOIP(avp); | |
139 | ip->i_flag &= ~IACC; | |
140 | } | |
141 | ||
142 | ||
143 | /* Generic read interface */ | |
144 | int | |
145 | afs_osi_Read(struct osi_file *afile, int offset, void *aptr, | |
146 | afs_int32 asize) | |
147 | { | |
148 | afs_ucred_t *oldCred; | |
149 | unsigned int resid; | |
150 | afs_int32 code; | |
151 | afs_int32 cnt1 = 0; | |
152 | AFS_STATCNT(osi_Read); | |
153 | ||
154 | /** | |
155 | * If the osi_file passed in is NULL, panic only if AFS is not shutting | |
156 | * down. No point in crashing when we are already shutting down | |
157 | */ | |
158 | if (!afile) { | |
159 | if (afs_shuttingdown == AFS_RUNNING) | |
160 | osi_Panic("osi_Read called with null param"); | |
161 | else | |
162 | return -EIO; | |
163 | } | |
164 | ||
165 | if (offset != -1) | |
166 | afile->offset = offset; | |
167 | retry_IO: | |
168 | /* Note the difference in the way the afile->offset is passed (see comments in gop_rdwr() in afs_aix_subr.c for comments) */ | |
169 | AFS_GUNLOCK(); | |
170 | #ifdef AFS_64BIT_KERNEL | |
171 | code = | |
172 | gop_rdwr(UIO_READ, afile->vnode, (caddr_t) aptr, asize, | |
173 | &afile->offset, AFS_UIOSYS, NULL, &resid); | |
174 | #else | |
175 | code = | |
176 | gop_rdwr(UIO_READ, afile->vnode, (caddr_t) aptr, asize, | |
177 | (off_t) & afile->offset, AFS_UIOSYS, NULL, &resid); | |
178 | #endif | |
179 | AFS_GLOCK(); | |
180 | if (code == 0) { | |
181 | code = asize - resid; | |
182 | afile->offset += code; | |
183 | osi_DisableAtimes(afile->vnode); | |
184 | } else { | |
185 | afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32, resid, | |
186 | ICL_TYPE_INT32, code); | |
187 | /* | |
188 | * To handle periodic low-level EFAULT failures that we've seen with the | |
189 | * Weitek chip; in all observed failed cases a second read succeeded. | |
190 | */ | |
191 | if ((code == EFAULT) && (cnt1++ < 5)) { | |
192 | afs_stats_cmperf.osiread_efaults++; | |
193 | goto retry_IO; | |
194 | } | |
195 | setuerror(code); | |
196 | if (code > 0) { | |
197 | code = -code; | |
198 | } | |
199 | } | |
200 | return code; | |
201 | } | |
202 | ||
203 | /* Generic write interface */ | |
204 | int | |
205 | afs_osi_Write(struct osi_file *afile, afs_int32 offset, void *aptr, | |
206 | afs_int32 asize) | |
207 | { | |
208 | afs_ucred_t *oldCred; | |
209 | unsigned int resid; | |
210 | afs_int32 code; | |
211 | AFS_STATCNT(osi_Write); | |
212 | if (!afile) | |
213 | osi_Panic("afs_osi_Write called with null param"); | |
214 | if (offset != -1) | |
215 | afile->offset = offset; | |
216 | /* Note the difference in the way the afile->offset is passed (see comments in gop_rdwr() in afs_aix_subr.c for comments) */ | |
217 | AFS_GUNLOCK(); | |
218 | #ifdef AFS_64BIT_KERNEL | |
219 | code = | |
220 | gop_rdwr(UIO_WRITE, afile->vnode, (caddr_t) aptr, asize, | |
221 | &afile->offset, AFS_UIOSYS, NULL, &resid); | |
222 | #else | |
223 | code = | |
224 | gop_rdwr(UIO_WRITE, afile->vnode, (caddr_t) aptr, asize, | |
225 | (off_t) & afile->offset, AFS_UIOSYS, NULL, &resid); | |
226 | #endif | |
227 | AFS_GLOCK(); | |
228 | if (code == 0) { | |
229 | if (resid) | |
230 | afs_Trace3(afs_iclSetp, CM_TRACE_WRITEFAILED, ICL_TYPE_INT32, | |
231 | asize, ICL_TYPE_INT32, resid, ICL_TYPE_INT32, code); | |
232 | code = asize - resid; | |
233 | afile->offset += code; | |
234 | } else { | |
235 | afs_Trace3(afs_iclSetp, CM_TRACE_WRITEFAILED, ICL_TYPE_INT32, asize, | |
236 | ICL_TYPE_INT32, resid, ICL_TYPE_INT32, code); | |
237 | if (code == ENOSPC) | |
238 | afs_WarnENOSPC(); | |
239 | setuerror(code); | |
240 | if (code > 0) { | |
241 | code = -code; | |
242 | } | |
243 | } | |
244 | if (afile->proc) { | |
245 | (*afile->proc) (afile, code); | |
246 | } | |
247 | return code; | |
248 | } | |
249 | ||
250 | ||
251 | /* This work should be handled by physstrat in ca/machdep.c. | |
252 | This routine written from the RT NFS port strategy routine. | |
253 | It has been generalized a bit, but should still be pretty clear. */ | |
254 | int | |
255 | afs_osi_MapStrategy(int (*aproc) (), struct buf *bp) | |
256 | { | |
257 | afs_int32 returnCode; | |
258 | ||
259 | AFS_STATCNT(osi_MapStrategy); | |
260 | returnCode = (*aproc) (bp); | |
261 | ||
262 | return returnCode; | |
263 | } | |
264 | ||
265 | ||
266 | ||
267 | void | |
268 | shutdown_osifile(void) | |
269 | { | |
270 | AFS_STATCNT(shutdown_osifile); | |
271 | if (afs_cold_shutdown) { | |
272 | afs_osicred_initialized = 0; | |
273 | } | |
274 | } |