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 "../afs/param.h" /* Should be always first */
16 #if !defined(AFS_HPUX_ENV) && !defined(AFS_SGI_ENV) && !defined(AFS_LINUX20_ENV)
18 #include "../afs/sysincludes.h" /* Standard vendor system headers */
19 #include "../afs/afsincludes.h" /* Afs-based standard headers */
20 #include "../afs/afs_stats.h" /* statistics */
21 #include "../afs/afs_cbqueue.h"
22 #include "../afs/nfsclient.h"
23 #include "../afs/afs_osidnlc.h"
28 #if defined(AFS_SUN5_ENV) || defined(AFS_OSF_ENV) || defined(AFS_DARWIN_ENV)
29 afs_ustrategy(abp, credp)
30 struct AFS_UCRED *credp;
34 register struct buf *abp; {
35 register afs_int32 code;
37 register struct vcache *tvc = (struct vcache *) abp->b_vp;
38 register afs_int32 len = abp->b_bcount;
39 #if !defined(AFS_SUN5_ENV) && !defined(AFS_OSF_ENV) && !defined(AFS_DARWIN_ENV)
43 struct AFS_UCRED *credp = u.u_cred;
46 #if defined(AFS_SUN_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_DARWIN_ENV)
47 int async = abp->b_flags & B_ASYNC;
49 struct iovec tiovec[1];
51 AFS_STATCNT(afs_ustrategy);
54 * So that it won't change while reading it
56 ObtainReadLock(&tvc->lock);
63 ReleaseReadLock(&tvc->lock);
66 if ((abp->b_flags & B_READ) == B_READ) {
67 /* read b_bcount bytes into kernel address b_un.b_addr starting
68 at byte DEV_BSIZE * b_blkno. Bzero anything we can't read,
69 and finally call iodone(abp). File is in abp->b_vp. Credentials
72 tuio.afsio_iov = tiovec;
73 tuio.afsio_iovcnt = 1;
74 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV)
75 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
76 #if defined(AFS_SUN5_ENV)
77 tuio._uio_offset._p._u = 0;
80 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
82 tuio.afsio_seg = AFS_UIOSYS;
86 tuio.afsio_resid = abp->b_bcount;
87 tiovec[0].iov_base = abp->b_un.b_addr;
88 tiovec[0].iov_len = abp->b_bcount;
89 /* are user's credentials valid here? probably, but this
90 sure seems like the wrong things to do. */
91 #if defined(AFS_SUN5_ENV)
92 code = afs_nlrdwr((struct vcache *) abp->b_vp, &tuio, UIO_READ, 0, credp);
94 code = afs_rdwr((struct vcache *) abp->b_vp, &tuio, UIO_READ, 0, credp);
97 if (tuio.afsio_resid > 0)
98 bzero(abp->b_un.b_addr + abp->b_bcount - tuio.afsio_resid, tuio.afsio_resid);
101 * If we read a block that is past EOF and the user was not storing
102 * to it, go ahead and write protect the page. This way we will detect
103 * storing beyond EOF in the future
105 if (dbtob(abp->b_blkno) + abp->b_bcount > tvc->m.Length) {
106 if ((abp->b_flags & B_PFSTORE) == 0) {
108 vm_protectp(tvc->vmh, dbtob(abp->b_blkno)/PAGESIZE,
109 abp->b_bcount/PAGESIZE, RDONLY);
117 tuio.afsio_iov = tiovec;
118 tuio.afsio_iovcnt = 1;
119 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV)
120 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
122 tuio._uio_offset._p._u = 0;
123 tuio.uio_limit = u.u_rlimit[RLIMIT_FSIZE].rlim_cur;
126 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
128 tuio.afsio_seg = AFS_UIOSYS;
130 tuio.afsio_fmode = 0;
134 * XXX It this really right? Ideally we should always write block size multiple
135 * and not any arbitrary size, right? XXX
137 len = MIN(len, tvc->m.Length - dbtob(abp->b_blkno));
140 len = MIN(abp->b_bcount, ((struct vcache *)abp->b_vp)->m.Length - dbtob(abp->b_blkno));
141 #endif /* AFS_ALPHA_ENV */
142 tuio.afsio_resid = len;
143 tiovec[0].iov_base = abp->b_un.b_addr;
144 tiovec[0].iov_len = len;
145 /* are user's credentials valid here? probably, but this
146 sure seems like the wrong things to do. */
147 #if defined(AFS_SUN5_ENV)
148 code = afs_nlrdwr((struct vcache *) abp->b_vp, &tuio, UIO_WRITE, 0, credp);
150 code = afs_rdwr((struct vcache *) abp->b_vp, &tuio, UIO_WRITE, 0, credp);
153 #if !defined(AFS_AIX32_ENV) && !defined(AFS_SUN5_ENV)
157 abp->b_flags |= B_ERROR;
160 if (code && !(abp->b_flags & B_READ)) {
161 /* prevent ubc from retrying writes */
163 ubc_invalidate(((struct vnode *)tvc)->v_object,
164 (vm_offset_t)dbtob(abp->b_blkno),
168 #else /* AFS_DUX40_ENV */
170 #endif /* AFS_DUX40_ENV */
175 afs_Trace3(afs_iclSetp, CM_TRACE_STRATEGYDONE, ICL_TYPE_POINTER, tvc,
176 ICL_TYPE_INT32, code,
177 ICL_TYPE_LONG, tuio.afsio_resid);
181 #endif /* !AFS_HPUX_ENV && !AFS_SGI_ENV && !AFS_LINUX20_ENV */