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"
19 #if !defined(AFS_HPUX_ENV) && !defined(AFS_SGI_ENV) && !defined(AFS_LINUX20_ENV) && !defined(AFS_DARWIN80_ENV)
21 #include "afs/sysincludes.h" /* Standard vendor system headers */
22 #include "afsincludes.h" /* Afs-based standard headers */
23 #include "afs/afs_stats.h" /* statistics */
24 #include "afs/afs_cbqueue.h"
25 #include "afs/nfsclient.h"
26 #include "afs/afs_osidnlc.h"
30 #if defined(AFS_SUN5_ENV) || defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
31 int afs_ustrategy(register struct buf *abp, afs_ucred_t *credp)
33 int afs_ustrategy(register struct buf *abp)
36 register afs_int32 code;
38 struct iovec tiovec[1];
39 register struct vcache *tvc = VTOAFS(abp->b_vp);
40 register afs_int32 len = abp->b_bcount;
43 #elif !defined(AFS_SUN5_ENV) && !defined(AFS_DARWIN_ENV) && !defined(AFS_XBSD_ENV)
44 afs_ucred_t *credp = u.u_cred;
47 AFS_STATCNT(afs_ustrategy);
50 * So that it won't change while reading it
52 ObtainReadLock(&tvc->lock);
59 ReleaseReadLock(&tvc->lock);
63 if (abp->b_iocmd == BIO_READ) {
65 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_SUN5_ENV) || defined(AFS_XBSD_ENV)
75 # ifdef AFS_64BIT_CLIENT
77 tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
79 tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
81 # else /* AFS_64BIT_CLIENT */
82 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
83 # endif /* AFS_64BIT_CLIENT */
85 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
87 tuio.afsio_seg = AFS_UIOSYS;
91 tuio.afsio_resid = abp->b_bcount;
92 #if defined(AFS_XBSD_ENV)
93 tiovec[0].iov_base = abp->b_saveaddr;
95 tiovec[0].iov_base = abp->b_un.b_addr;
96 #endif /* AFS_XBSD_ENV */
97 tiovec[0].iov_len = abp->b_bcount;
98 /* are user's credentials valid here? probably, but this
99 * sure seems like the wrong things to do. */
100 #if defined(AFS_SUN5_ENV)
101 code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
103 code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
106 if (tuio.afsio_resid > 0)
107 #if defined(AFS_XBSD_ENV)
108 memset(abp->b_saveaddr + abp->b_bcount - tuio.afsio_resid, 0,
111 memset(abp->b_un.b_addr + abp->b_bcount - tuio.afsio_resid, 0,
113 #endif /* AFS_XBSD_ENV */
116 * If we read a block that is past EOF and the user was not storing
117 * to it, go ahead and write protect the page. This way we will detect
118 * storing beyond EOF in the future
120 if (dbtob(abp->b_blkno) + abp->b_bcount > tvc->f.m.Length) {
121 if ((abp->b_flags & B_PFSTORE) == 0) {
123 vm_protectp(tvc->segid, dbtob(abp->b_blkno) / PAGESIZE,
124 abp->b_bcount / PAGESIZE, RDONLY);
131 tuio.afsio_iov = tiovec;
132 tuio.afsio_iovcnt = 1;
133 #if defined(AFS_SUN5_ENV)
134 #ifdef AFS_64BIT_CLIENT
136 tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
138 tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
140 #else /* AFS_64BIT_CLIENT */
141 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
142 #endif /* AFS_64BIT_CLIENT */
145 tuio.uio_limit = curproc->p_fsz_ctl.rlim_cur;
147 tuio.uio_limit = u.u_rlimit[RLIMIT_FSIZE].rlim_cur;
151 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
153 tuio.afsio_seg = AFS_UIOSYS;
155 tuio.afsio_fmode = 0;
159 * XXX It this really right? Ideally we should always write block size multiple
160 * and not any arbitrary size, right? XXX
162 len = MIN(len, tvc->f.m.Length - dbtob(abp->b_blkno));
164 tuio.afsio_resid = len;
165 #if defined(AFS_XBSD_ENV)
166 tiovec[0].iov_base = abp->b_saveaddr;
168 tiovec[0].iov_base = abp->b_un.b_addr;
169 #endif /* AFS_XBSD_ENV */
170 tiovec[0].iov_len = len;
171 /* are user's credentials valid here? probably, but this
172 * sure seems like the wrong things to do. */
173 #if defined(AFS_SUN5_ENV)
174 code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
176 code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
180 #if defined (AFS_XBSD_ENV)
183 #if !defined(AFS_FBSD50_ENV)
184 abp->b_flags |= B_ERROR;
189 #if defined(AFS_AIX32_ENV)
191 #elif defined(AFS_FBSD60_ENV)
192 (*abp->b_iodone)(abp);
193 #elif defined(AFS_FBSD50_ENV)
195 #elif defined(AFS_XBSD_ENV)
197 #elif !defined(AFS_SUN5_ENV)
201 afs_Trace3(afs_iclSetp, CM_TRACE_STRATEGYDONE, ICL_TYPE_POINTER, tvc,
202 ICL_TYPE_INT32, code, ICL_TYPE_LONG, tuio.afsio_resid);
206 #endif /* !AFS_HPUX_ENV && !AFS_SGI_ENV && !AFS_LINUX20_ENV */