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"
16 #include "afs/sysincludes.h" /* Standard vendor system headers */
17 #include "afsincludes.h" /* Afs-based standard headers */
18 #include "afs/afs_stats.h" /* afs statistics */
21 int afs_osicred_initialized = 0;
22 struct AFS_UCRED afs_osi_cred;
23 afs_lock_t afs_xosi; /* lock is for tvattr */
24 extern struct osi_dev cacheDev;
25 extern struct mount *afs_cacheVfsp;
29 osi_UFSOpen(afs_int32 ainode)
32 register struct osi_file *afile = NULL;
33 extern int cacheDiskType;
36 AFS_STATCNT(osi_UFSOpen);
37 if (cacheDiskType != AFS_FCACHE_TYPE_UFS)
38 osi_Panic("UFSOpen called for non-UFS cache\n");
39 afile = (struct osi_file *)osi_AllocSmallSpace(sizeof(struct osi_file));
42 igetinode(afs_cacheVfsp, (dev_t) cacheDev.dev, (ino_t) ainode, &ip,
46 osi_FreeSmallSpace(afile);
47 osi_Panic("UFSOpen: igetinode failed");
50 afile->vnode = ITOV(ip);
51 afile->size = VTOI(afile->vnode)->i_size;
53 afile->proc = (int (*)())0;
54 afile->inum = ainode; /* for hint validity checking */
59 afs_osi_Stat(register struct osi_file *afile, register struct osi_stat *astat)
61 register afs_int32 code;
63 AFS_STATCNT(osi_Stat);
64 MObtainWriteLock(&afs_xosi, 320);
66 VOP_GETATTR(afile->vnode, &tvattr, afs_osi_credp, code);
69 astat->size = tvattr.va_size;
70 astat->blksize = tvattr.va_blocksize;
71 astat->mtime = tvattr.va_mtime.tv_sec;
72 astat->atime = tvattr.va_atime.tv_sec;
74 MReleaseWriteLock(&afs_xosi);
79 osi_UFSClose(register struct osi_file *afile)
81 AFS_STATCNT(osi_Close);
83 AFS_RELE(afile->vnode);
86 osi_FreeSmallSpace(afile);
91 osi_UFSTruncate(register struct osi_file *afile, afs_int32 asize)
93 struct AFS_UCRED *oldCred;
95 register afs_int32 code;
96 struct osi_stat tstat;
97 AFS_STATCNT(osi_Truncate);
99 /* This routine only shrinks files, and most systems
100 * have very slow truncates, even when the file is already
101 * small enough. Check now and save some time.
103 code = afs_osi_Stat(afile, &tstat);
104 if (code || tstat.size <= asize)
106 MObtainWriteLock(&afs_xosi, 321);
108 /* note that this credential swapping stuff is only necessary because
109 * of ufs's references directly to cred instead of to
110 * credentials parameter. Probably should fix ufs some day. */
111 oldCred = curproc->p_cred->pc_ucred; /* remember old credentials pointer */
112 curproc->p_cred->pc_ucred = afs_osi_credp;
113 /* temporarily use superuser credentials */
114 tvattr.va_size = asize;
116 VOP_SETATTR(afile->vnode, &tvattr, afs_osi_credp, code);
118 curproc->p_cred->pc_ucred = oldCred; /* restore */
119 MReleaseWriteLock(&afs_xosi);
124 osi_DisableAtimes(struct vnode *avp)
126 struct inode *ip = VTOI(avp);
131 /* Generic read interface */
133 afs_osi_Read(register struct osi_file *afile, int offset, void *aptr,
136 struct AFS_UCRED *oldCred;
138 register afs_int32 code;
139 register afs_int32 cnt1 = 0;
140 AFS_STATCNT(osi_Read);
143 * If the osi_file passed in is NULL, panic only if AFS is not shutting
144 * down. No point in crashing when we are already shutting down
147 if (!afs_shuttingdown)
148 osi_Panic("osi_Read called with null param");
154 afile->offset = offset;
157 gop_rdwr(UIO_READ, afile->vnode, (caddr_t) aptr, asize, afile->offset,
158 AFS_UIOSYS, IO_UNIT, afs_osi_credp, &resid);
161 code = asize - resid;
162 afile->offset += code;
163 osi_DisableAtimes(afile->vnode);
165 afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32, resid,
166 ICL_TYPE_INT32, code);
172 /* Generic write interface */
174 afs_osi_Write(register struct osi_file *afile, afs_int32 offset, void *aptr,
177 struct AFS_UCRED *oldCred;
179 register afs_int32 code;
180 AFS_STATCNT(osi_Write);
182 osi_Panic("afs_osi_Write called with null param");
184 afile->offset = offset;
186 struct ucred *tmpcred = curproc->p_cred->pc_ucred;
187 curproc->p_cred->pc_ucred = afs_osi_credp;
190 gop_rdwr(UIO_WRITE, afile->vnode, (caddr_t) aptr, asize,
191 afile->offset, AFS_UIOSYS, IO_UNIT, afs_osi_credp,
194 curproc->p_cred->pc_ucred = tmpcred;
197 code = asize - resid;
198 afile->offset += code;
203 (*afile->proc) (afile, code);
209 /* This work should be handled by physstrat in ca/machdep.c.
210 This routine written from the RT NFS port strategy routine.
211 It has been generalized a bit, but should still be pretty clear. */
213 afs_osi_MapStrategy(int (*aproc) (), register struct buf *bp)
215 afs_int32 returnCode;
217 AFS_STATCNT(osi_MapStrategy);
218 returnCode = (*aproc) (bp);
226 shutdown_osifile(void)
228 extern int afs_cold_shutdown;
230 AFS_STATCNT(shutdown_osifile);
231 if (afs_cold_shutdown) {
232 afs_osicred_initialized = 0;