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"
20 #if !defined(AFS_HPUX_ENV) && !defined(AFS_SGI_ENV) && !defined(AFS_LINUX20_ENV)
22 #include "afs/sysincludes.h" /* Standard vendor system headers */
23 #include "afsincludes.h" /* Afs-based standard headers */
24 #include "afs/afs_stats.h" /* statistics */
25 #include "afs/afs_cbqueue.h"
26 #include "afs/nfsclient.h"
27 #include "afs/afs_osidnlc.h"
32 #if defined(AFS_SUN5_ENV) || defined(AFS_OSF_ENV) || defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
33 afs_ustrategy(abp, credp)
34 struct AFS_UCRED *credp;
38 register struct buf *abp; {
39 register afs_int32 code;
41 register struct vcache *tvc = VTOAFS(abp->b_vp);
42 register afs_int32 len = abp->b_bcount;
43 #if !defined(AFS_SUN5_ENV) && !defined(AFS_OSF_ENV) && !defined(AFS_DARWIN_ENV) && !defined(AFS_XBSD_ENV)
47 struct AFS_UCRED *credp = u.u_cred;
50 struct iovec tiovec[1];
52 AFS_STATCNT(afs_ustrategy);
55 * So that it won't change while reading it
57 ObtainReadLock(&tvc->lock);
64 ReleaseReadLock(&tvc->lock);
68 if (abp->b_iocmd == BIO_READ) {
70 if ((abp->b_flags & B_READ) == B_READ) {
72 /* read b_bcount bytes into kernel address b_un.b_addr starting
73 at byte DEV_BSIZE * b_blkno. Bzero anything we can't read,
74 and finally call iodone(abp). File is in abp->b_vp. Credentials
77 tuio.afsio_iov = tiovec;
78 tuio.afsio_iovcnt = 1;
79 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_XBSD_ENV)
80 #ifdef AFS_64BIT_CLIENT
81 tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
82 #else /* AFS_64BIT_CLIENT */
83 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
84 #if defined(AFS_SUN5_ENV)
85 tuio._uio_offset._p._u = 0;
87 #endif /* AFS_64BIT_CLIENT */
89 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
91 tuio.afsio_seg = AFS_UIOSYS;
95 tuio.afsio_resid = abp->b_bcount;
96 #if defined(AFS_XBSD_ENV)
97 tiovec[0].iov_base = abp->b_saveaddr;
99 tiovec[0].iov_base = abp->b_un.b_addr;
100 #endif /* AFS_XBSD_ENV */
101 tiovec[0].iov_len = abp->b_bcount;
102 /* are user's credentials valid here? probably, but this
103 sure seems like the wrong things to do. */
104 #if defined(AFS_SUN5_ENV)
105 code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
107 code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
110 if (tuio.afsio_resid > 0)
111 #if defined(AFS_XBSD_ENV)
112 memset(abp->b_saveaddr + abp->b_bcount - tuio.afsio_resid, 0, tuio.afsio_resid);
114 memset(abp->b_un.b_addr + abp->b_bcount - tuio.afsio_resid, 0, tuio.afsio_resid);
115 #endif /* AFS_XBSD_ENV */
118 * If we read a block that is past EOF and the user was not storing
119 * to it, go ahead and write protect the page. This way we will detect
120 * storing beyond EOF in the future
122 if (dbtob(abp->b_blkno) + abp->b_bcount > tvc->m.Length) {
123 if ((abp->b_flags & B_PFSTORE) == 0) {
125 vm_protectp(tvc->segid, dbtob(abp->b_blkno)/PAGESIZE,
126 abp->b_bcount/PAGESIZE, RDONLY);
134 tuio.afsio_iov = tiovec;
135 tuio.afsio_iovcnt = 1;
136 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV)
137 #ifdef AFS_64BIT_CLIENT
138 tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
139 #else /* AFS_64BIT_CLIENT */
140 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
142 tuio._uio_offset._p._u = 0;
144 #endif /* AFS_64BIT_CLIENT */
147 tuio.uio_limit = curproc->p_fsz_ctl.rlim_cur;
149 tuio.uio_limit = u.u_rlimit[RLIMIT_FSIZE].rlim_cur;
153 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
155 tuio.afsio_seg = AFS_UIOSYS;
157 tuio.afsio_fmode = 0;
161 * XXX It this really right? Ideally we should always write block size multiple
162 * and not any arbitrary size, right? XXX
164 len = MIN(len, tvc->m.Length - dbtob(abp->b_blkno));
167 len = MIN(abp->b_bcount, (VTOAFS(abp->b_vp))->m.Length - dbtob(abp->b_blkno));
168 #endif /* AFS_ALPHA_ENV */
169 tuio.afsio_resid = len;
170 #if defined(AFS_XBSD_ENV)
171 tiovec[0].iov_base = abp->b_saveaddr;
173 tiovec[0].iov_base = abp->b_un.b_addr;
174 #endif /* AFS_XBSD_ENV */
175 tiovec[0].iov_len = len;
176 /* are user's credentials valid here? probably, but this
177 sure seems like the wrong things to do. */
178 #if defined(AFS_SUN5_ENV)
179 code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
181 code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
184 #if !defined(AFS_AIX32_ENV) && !defined(AFS_SUN5_ENV)
185 #if defined(AFS_DUX40_ENV) || (defined (AFS_XBSD_ENV) && !defined (AFS_FBSD50_ENV))
188 abp->b_flags |= B_ERROR;
191 #if defined(AFS_DUX40_ENV)
192 if (code && !(abp->b_flags & B_READ)) {
193 /* prevent ubc from retrying writes */
195 ubc_invalidate(AFSTOV(tvc)->v_object,
196 (vm_offset_t)dbtob(abp->b_blkno),
201 #else /* AFS_DUX40_ENV */
203 #endif /* AFS_DUX40_ENV */
208 afs_Trace3(afs_iclSetp, CM_TRACE_STRATEGYDONE, ICL_TYPE_POINTER, tvc,
209 ICL_TYPE_INT32, code,
210 ICL_TYPE_LONG, tuio.afsio_resid);
214 #endif /* !AFS_HPUX_ENV && !AFS_SGI_ENV && !AFS_LINUX20_ENV */