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_LINUX_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(struct buf *abp, afs_ucred_t *credp)
33 int afs_ustrategy(struct buf *abp)
38 struct iovec tiovec[1];
39 struct vcache *tvc = VTOAFS(abp->b_vp);
40 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 memset(&tuio, 0, sizeof(tuio));
50 memset(&tiovec, 0, sizeof(tiovec));
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_SUN5_ENV) || defined(AFS_XBSD_ENV)
80 # ifdef AFS_64BIT_CLIENT
82 tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
84 tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
86 # else /* AFS_64BIT_CLIENT */
87 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
88 # endif /* AFS_64BIT_CLIENT */
90 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
92 #if defined(AFS_NBSD40_ENV)
93 UIO_SETUP_SYSSPACE(&tuio);
95 tuio.afsio_seg = AFS_UIOSYS;
100 tuio.afsio_resid = abp->b_bcount;
101 #if defined(AFS_NBSD40_ENV) || defined(FBSD_STRUCT_BUF_NO_SAVEADDR)
102 tiovec[0].iov_base = abp->b_data;
103 #elif defined(AFS_XBSD_ENV)
104 tiovec[0].iov_base = abp->b_saveaddr;
106 tiovec[0].iov_base = abp->b_un.b_addr;
107 #endif /* AFS_XBSD_ENV */
108 tiovec[0].iov_len = abp->b_bcount;
109 /* are user's credentials valid here? probably, but this
110 * sure seems like the wrong things to do. */
111 #if defined(AFS_SUN5_ENV)
112 code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
114 code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
117 if (tuio.afsio_resid > 0)
118 #if defined(AFS_NBSD40_ENV) || defined(FBSD_STRUCT_BUF_NO_SAVEADDR)
119 memset((char *)abp->b_data + (uintptr_t)abp->b_bcount - tuio.afsio_resid, 0,
121 #elif defined(AFS_XBSD_ENV)
122 memset(abp->b_saveaddr + abp->b_bcount - tuio.afsio_resid, 0,
125 memset(abp->b_un.b_addr + abp->b_bcount - tuio.afsio_resid, 0,
127 #endif /* AFS_XBSD_ENV */
130 * If we read a block that is past EOF and the user was not storing
131 * to it, go ahead and write protect the page. This way we will detect
132 * storing beyond EOF in the future
134 if (dbtob(abp->b_blkno) + abp->b_bcount > tvc->f.m.Length) {
135 if ((abp->b_flags & B_PFSTORE) == 0) {
137 vm_protectp(tvc->segid, dbtob(abp->b_blkno) / PAGESIZE,
138 abp->b_bcount / PAGESIZE, RDONLY);
145 tuio.afsio_iov = tiovec;
146 tuio.afsio_iovcnt = 1;
147 #if defined(AFS_SUN5_ENV)
148 #ifdef AFS_64BIT_CLIENT
150 tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
152 tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
154 #else /* AFS_64BIT_CLIENT */
155 tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
156 #endif /* AFS_64BIT_CLIENT */
159 tuio.uio_limit = curproc->p_fsz_ctl.rlim_cur;
161 tuio.uio_limit = u.u_rlimit[RLIMIT_FSIZE].rlim_cur;
165 tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
167 #if defined(AFS_NBSD40_ENV)
168 UIO_SETUP_SYSSPACE(&tuio);
170 tuio.afsio_seg = AFS_UIOSYS;
173 tuio.afsio_fmode = 0;
177 * XXX It this really right? Ideally we should always write block size multiple
178 * and not any arbitrary size, right? XXX
180 len = MIN(len, tvc->f.m.Length - dbtob(abp->b_blkno));
182 tuio.afsio_resid = len;
183 #if defined(AFS_NBSD40_ENV) || defined(FBSD_STRUCT_BUF_NO_SAVEADDR)
184 tiovec[0].iov_base = abp->b_data;
185 #elif defined(AFS_XBSD_ENV)
186 tiovec[0].iov_base = abp->b_saveaddr;
188 tiovec[0].iov_base = abp->b_un.b_addr;
189 #endif /* AFS_XBSD_ENV */
190 tiovec[0].iov_len = len;
191 /* are user's credentials valid here? probably, but this
192 * sure seems like the wrong things to do. */
193 #if defined(AFS_SUN5_ENV)
194 code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
196 code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
200 #if defined (AFS_XBSD_ENV)
203 #if !defined(AFS_FBSD_ENV) && !defined(AFS_NBSD50_ENV)
204 abp->b_flags |= B_ERROR;
209 #if defined(AFS_AIX32_ENV)
211 #elif defined(AFS_FBSD_ENV)
212 (*abp->b_iodone)(abp);
213 #elif defined(AFS_NBSD40_ENV)
214 abp->b_resid = tuio.uio_resid;
216 #elif defined(AFS_XBSD_ENV)
218 #elif !defined(AFS_SUN5_ENV)
222 afs_Trace3(afs_iclSetp, CM_TRACE_STRATEGYDONE, ICL_TYPE_POINTER, tvc,
223 ICL_TYPE_INT32, code, ICL_TYPE_LONG, tuio.afsio_resid);
227 #endif /* !AFS_HPUX_ENV && !AFS_SGI_ENV && !AFS_LINUX_ENV */