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(UKERNEL)
44 afs_ucred_t *credp = get_user_struct()->u_cred;
45 #elif !defined(AFS_SUN5_ENV) && !defined(AFS_DARWIN_ENV) && !defined(AFS_XBSD_ENV)
46 afs_ucred_t *credp = u.u_cred;
49 AFS_STATCNT(afs_ustrategy);
52 * So that it won't change while reading it
54 ObtainReadLock(&tvc->lock);
61 ReleaseReadLock(&tvc->lock);
65 if (abp->b_iocmd == BIO_READ) {
67 if ((abp->b_flags & B_READ) == B_READ) {
69 /* read b_bcount bytes into kernel address b_un.b_addr starting
70 * at byte DEV_BSIZE * b_blkno. Bzero anything we can't read,
71 * and finally call iodone(abp). File is in abp->b_vp. Credentials
74 tuio.afsio_iov = tiovec;
75 tuio.afsio_iovcnt = 1;
76 #if defined(AFS_SUN5_ENV) || defined(AFS_XBSD_ENV)
77 # ifdef AFS_64BIT_CLIENT
79 tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
81 tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
83 # else /* AFS_64BIT_CLIENT */
84 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
85 # endif /* AFS_64BIT_CLIENT */
87 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
89 #if defined(AFS_NBSD40_ENV)
90 UIO_SETUP_SYSSPACE(&tuio);
92 tuio.afsio_seg = AFS_UIOSYS;
97 tuio.afsio_resid = abp->b_bcount;
98 #if defined(AFS_XBSD_ENV)
99 tiovec[0].iov_base = abp->b_saveaddr;
101 tiovec[0].iov_base = abp->b_un.b_addr;
102 #endif /* AFS_XBSD_ENV */
103 tiovec[0].iov_len = abp->b_bcount;
104 /* are user's credentials valid here? probably, but this
105 * sure seems like the wrong things to do. */
106 #if defined(AFS_SUN5_ENV)
107 code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
109 code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
112 if (tuio.afsio_resid > 0)
113 #if defined(AFS_XBSD_ENV)
114 memset(abp->b_saveaddr + abp->b_bcount - tuio.afsio_resid, 0,
117 memset(abp->b_un.b_addr + abp->b_bcount - tuio.afsio_resid, 0,
119 #endif /* AFS_XBSD_ENV */
122 * If we read a block that is past EOF and the user was not storing
123 * to it, go ahead and write protect the page. This way we will detect
124 * storing beyond EOF in the future
126 if (dbtob(abp->b_blkno) + abp->b_bcount > tvc->f.m.Length) {
127 if ((abp->b_flags & B_PFSTORE) == 0) {
129 vm_protectp(tvc->segid, dbtob(abp->b_blkno) / PAGESIZE,
130 abp->b_bcount / PAGESIZE, RDONLY);
137 tuio.afsio_iov = tiovec;
138 tuio.afsio_iovcnt = 1;
139 #if defined(AFS_SUN5_ENV)
140 #ifdef AFS_64BIT_CLIENT
142 tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
144 tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
146 #else /* AFS_64BIT_CLIENT */
147 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
148 #endif /* AFS_64BIT_CLIENT */
151 tuio.uio_limit = curproc->p_fsz_ctl.rlim_cur;
153 tuio.uio_limit = u.u_rlimit[RLIMIT_FSIZE].rlim_cur;
157 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
159 #if defined(AFS_NBSD40_ENV)
160 UIO_SETUP_SYSSPACE(&tuio);
162 tuio.afsio_seg = AFS_UIOSYS;
165 tuio.afsio_fmode = 0;
169 * XXX It this really right? Ideally we should always write block size multiple
170 * and not any arbitrary size, right? XXX
172 len = MIN(len, tvc->f.m.Length - dbtob(abp->b_blkno));
174 tuio.afsio_resid = len;
175 #if defined(AFS_XBSD_ENV)
176 tiovec[0].iov_base = abp->b_saveaddr;
178 tiovec[0].iov_base = abp->b_un.b_addr;
179 #endif /* AFS_XBSD_ENV */
180 tiovec[0].iov_len = len;
181 /* are user's credentials valid here? probably, but this
182 * sure seems like the wrong things to do. */
183 #if defined(AFS_SUN5_ENV)
184 code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
186 code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
190 #if defined (AFS_XBSD_ENV)
193 #if !defined(AFS_FBSD50_ENV)
194 abp->b_flags |= B_ERROR;
199 #if defined(AFS_AIX32_ENV)
201 #elif defined(AFS_FBSD60_ENV)
202 (*abp->b_iodone)(abp);
203 #elif defined(AFS_FBSD50_ENV)
205 #elif defined(AFS_XBSD_ENV)
207 #elif !defined(AFS_SUN5_ENV)
211 afs_Trace3(afs_iclSetp, CM_TRACE_STRATEGYDONE, ICL_TYPE_POINTER, tvc,
212 ICL_TYPE_INT32, code, ICL_TYPE_LONG, tuio.afsio_resid);
216 #endif /* !AFS_HPUX_ENV && !AFS_SGI_ENV && !AFS_LINUX20_ENV */