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
15 #include <afsconfig.h>
16 #include "afs/param.h"
21 #if !defined(AFS_HPUX_ENV) && !defined(AFS_SGI_ENV) && !defined(AFS_LINUX20_ENV) && !defined(AFS_DARWIN80_ENV)
23 #include "afs/sysincludes.h" /* Standard vendor system headers */
24 #include "afsincludes.h" /* Afs-based standard headers */
25 #include "afs/afs_stats.h" /* statistics */
26 #include "afs/afs_cbqueue.h"
27 #include "afs/nfsclient.h"
28 #include "afs/afs_osidnlc.h"
33 #if defined(AFS_SUN5_ENV) || defined(AFS_OSF_ENV) || defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
34 afs_ustrategy(abp, credp)
35 struct AFS_UCRED *credp;
39 register struct buf *abp;
41 register afs_int32 code;
43 struct uio *tuiop = &tuio;
44 struct iovec tiovec[1];
45 register struct vcache *tvc = VTOAFS(abp->b_vp);
46 register afs_int32 len = abp->b_bcount;
47 #if !defined(AFS_SUN5_ENV) && !defined(AFS_OSF_ENV) && !defined(AFS_DARWIN_ENV) && !defined(AFS_XBSD_ENV)
51 struct AFS_UCRED *credp = u.u_cred;
55 AFS_STATCNT(afs_ustrategy);
58 * So that it won't change while reading it
60 ObtainReadLock(&tvc->lock);
67 ReleaseReadLock(&tvc->lock);
71 if (abp->b_iocmd == BIO_READ) {
73 if ((abp->b_flags & B_READ) == B_READ) {
75 /* read b_bcount bytes into kernel address b_un.b_addr starting
76 * at byte DEV_BSIZE * b_blkno. Bzero anything we can't read,
77 * and finally call iodone(abp). File is in abp->b_vp. Credentials
80 tuio.afsio_iov = tiovec;
81 tuio.afsio_iovcnt = 1;
82 #if defined(AFS_OSF_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_XBSD_ENV)
83 #ifdef AFS_64BIT_CLIENT
85 tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
87 tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
89 #else /* AFS_64BIT_CLIENT */
90 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
91 #endif /* AFS_64BIT_CLIENT */
93 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
95 tuio.afsio_seg = AFS_UIOSYS;
99 tuio.afsio_resid = abp->b_bcount;
100 #if defined(AFS_XBSD_ENV)
101 tiovec[0].iov_base = abp->b_saveaddr;
103 tiovec[0].iov_base = abp->b_un.b_addr;
104 #endif /* AFS_XBSD_ENV */
105 tiovec[0].iov_len = abp->b_bcount;
106 /* are user's credentials valid here? probably, but this
107 * sure seems like the wrong things to do. */
108 #if defined(AFS_SUN5_ENV)
109 code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
111 code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
114 if (tuio.afsio_resid > 0)
115 #if defined(AFS_XBSD_ENV)
116 memset(abp->b_saveaddr + abp->b_bcount - tuio.afsio_resid, 0,
119 memset(abp->b_un.b_addr + abp->b_bcount - tuio.afsio_resid, 0,
121 #endif /* AFS_XBSD_ENV */
124 * If we read a block that is past EOF and the user was not storing
125 * to it, go ahead and write protect the page. This way we will detect
126 * storing beyond EOF in the future
128 if (dbtob(abp->b_blkno) + abp->b_bcount > tvc->m.Length) {
129 if ((abp->b_flags & B_PFSTORE) == 0) {
131 vm_protectp(tvc->segid, dbtob(abp->b_blkno) / PAGESIZE,
132 abp->b_bcount / PAGESIZE, RDONLY);
139 tuio.afsio_iov = tiovec;
140 tuio.afsio_iovcnt = 1;
141 #if defined(AFS_OSF_ENV) || defined(AFS_SUN5_ENV)
142 #ifdef AFS_64BIT_CLIENT
144 tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
146 tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
148 #else /* AFS_64BIT_CLIENT */
149 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
150 #endif /* AFS_64BIT_CLIENT */
153 tuio.uio_limit = curproc->p_fsz_ctl.rlim_cur;
155 tuio.uio_limit = u.u_rlimit[RLIMIT_FSIZE].rlim_cur;
159 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
161 tuio.afsio_seg = AFS_UIOSYS;
163 tuio.afsio_fmode = 0;
167 * XXX It this really right? Ideally we should always write block size multiple
168 * and not any arbitrary size, right? XXX
170 len = MIN(len, tvc->m.Length - dbtob(abp->b_blkno));
175 (VTOAFS(abp->b_vp))->m.Length - dbtob(abp->b_blkno));
176 #endif /* AFS_OSF_ENV */
177 tuio.afsio_resid = len;
178 #if defined(AFS_XBSD_ENV)
179 tiovec[0].iov_base = abp->b_saveaddr;
181 tiovec[0].iov_base = abp->b_un.b_addr;
182 #endif /* AFS_XBSD_ENV */
183 tiovec[0].iov_len = len;
184 /* are user's credentials valid here? probably, but this
185 * sure seems like the wrong things to do. */
186 #if defined(AFS_SUN5_ENV)
187 code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
189 code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
193 #if defined(AFS_DUX40_ENV) || defined (AFS_XBSD_ENV)
196 #if !defined(AFS_FBSD50_ENV)
197 abp->b_flags |= B_ERROR;
202 #if defined(AFS_AIX32_ENV)
204 #elif defined(AFS_DUX40_ENV)
206 if (code && !(abp->b_flags & B_READ)) {
207 /* prevent ubc from retrying writes */
209 ubc_invalidate(AFSTOV(tvc)->v_object,
210 (vm_offset_t) dbtob(abp->b_blkno), PAGE_SIZE, B_INVAL);
213 #elif defined(AFS_FBSD60_ENV)
214 (*abp->b_iodone)(abp);
215 #elif defined(AFS_FBSD50_ENV)
217 #elif defined(AFS_XBSD_ENV)
219 #elif !defined(AFS_SUN5_ENV)
223 afs_Trace3(afs_iclSetp, CM_TRACE_STRATEGYDONE, ICL_TYPE_POINTER, tvc,
224 ICL_TYPE_INT32, code, ICL_TYPE_LONG, tuio.afsio_resid);
228 #endif /* !AFS_HPUX_ENV && !AFS_SGI_ENV && !AFS_LINUX20_ENV */