[hcoop/debian/openafs.git] / src / afs / VNOPS / afs_vnop_strategy.c

/*
 * Copyright 2000, International Business Machines Corporation and others.
 * All Rights Reserved.
 * 
 * This software has been released under the terms of the IBM Public
 * License.  For details, see the LICENSE file in the top-level source
 * directory or online at http://www.openafs.org/dl/license10.html
 */

/*
 * Implements:
 * afs_ustrategy
 */

#include <afsconfig.h>
#include "afs/param.h"


#if !defined(AFS_HPUX_ENV) && !defined(AFS_SGI_ENV) && !defined(AFS_LINUX20_ENV) && !defined(AFS_DARWIN80_ENV)

#include "afs/sysincludes.h"	/* Standard vendor system headers */
#include "afsincludes.h"	/* Afs-based standard headers */
#include "afs/afs_stats.h"	/* statistics */
#include "afs/afs_cbqueue.h"
#include "afs/nfsclient.h"
#include "afs/afs_osidnlc.h"


#if defined(AFS_SUN5_ENV) || defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
int afs_ustrategy(struct buf *abp, afs_ucred_t *credp)
#else
int afs_ustrategy(struct buf *abp)
#endif
{
    afs_int32 code;
    struct uio tuio;
    struct iovec tiovec[1];
    struct vcache *tvc = VTOAFS(abp->b_vp);
    afs_int32 len = abp->b_bcount;
#ifdef	AFS_AIX41_ENV
    struct ucred *credp;
#elif defined(UKERNEL)
    afs_ucred_t *credp = get_user_struct()->u_cred;
#elif !defined(AFS_SUN5_ENV) && !defined(AFS_DARWIN_ENV) && !defined(AFS_XBSD_ENV)
    afs_ucred_t *credp = u.u_cred;
#endif

    memset(&tuio, 0, sizeof(tuio));
    memset(&tiovec, 0, sizeof(tiovec));

    AFS_STATCNT(afs_ustrategy);
#ifdef	AFS_AIX41_ENV
    /*
     * So that it won't change while reading it
     */
    ObtainReadLock(&tvc->lock);
    if (tvc->credp) {
	credp = tvc->credp;
	crhold(credp);
    } else {
	credp = crref();
    }
    ReleaseReadLock(&tvc->lock);
    osi_Assert(credp);
#endif
#ifdef AFS_FBSD_ENV
    if (abp->b_iocmd == BIO_READ) {
#else
    if ((abp->b_flags & B_READ) == B_READ) {
#endif
	/* read b_bcount bytes into kernel address b_un.b_addr starting
	 * at byte DEV_BSIZE * b_blkno.  Bzero anything we can't read,
	 * and finally call iodone(abp).  File is in abp->b_vp.  Credentials
	 * are from u area??
	 */
	tuio.afsio_iov = tiovec;
	tuio.afsio_iovcnt = 1;
#if defined(AFS_SUN5_ENV) || defined(AFS_XBSD_ENV)
# ifdef AFS_64BIT_CLIENT
#  ifdef AFS_SUN5_ENV
	tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
#  else
	tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
#  endif
# else /* AFS_64BIT_CLIENT */
	tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
# endif /* AFS_64BIT_CLIENT */
#else
	tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
#endif
#if defined(AFS_NBSD40_ENV)
	UIO_SETUP_SYSSPACE(&tuio);
#else
	tuio.afsio_seg = AFS_UIOSYS;
#endif
#ifdef AFS_UIOFMODE
	tuio.afsio_fmode = 0;
#endif
	tuio.afsio_resid = abp->b_bcount;
#if defined(AFS_NBSD40_ENV) || defined(FBSD_STRUCT_BUF_NO_SAVEADDR)
	tiovec[0].iov_base = abp->b_data;
#elif defined(AFS_XBSD_ENV)
	tiovec[0].iov_base = abp->b_saveaddr;
#else
	tiovec[0].iov_base = abp->b_un.b_addr;
#endif /* AFS_XBSD_ENV */
	tiovec[0].iov_len = abp->b_bcount;
	/* are user's credentials valid here?  probably, but this
	 * sure seems like the wrong things to do. */
#if	defined(AFS_SUN5_ENV)
	code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
#else
	code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
#endif
	if (code == 0) {
	    if (tuio.afsio_resid > 0)
#if defined(AFS_NBSD40_ENV) || defined(FBSD_STRUCT_BUF_NO_SAVEADDR)
		memset((char *)abp->b_data + (uintptr_t)abp->b_bcount - tuio.afsio_resid, 0,
		       tuio.afsio_resid);
#elif defined(AFS_XBSD_ENV)
		memset(abp->b_saveaddr + abp->b_bcount - tuio.afsio_resid, 0,
		       tuio.afsio_resid);
#else
		memset(abp->b_un.b_addr + abp->b_bcount - tuio.afsio_resid, 0,
		       tuio.afsio_resid);
#endif /* AFS_XBSD_ENV */
#ifdef	AFS_AIX32_ENV
	    /*
	     * If we read a block that is past EOF and the user was not storing
	     * to it, go ahead and write protect the page. This way we will detect
	     * storing beyond EOF in the future
	     */
	    if (dbtob(abp->b_blkno) + abp->b_bcount > tvc->f.m.Length) {
		if ((abp->b_flags & B_PFSTORE) == 0) {
		    AFS_GUNLOCK();
		    vm_protectp(tvc->segid, dbtob(abp->b_blkno) / PAGESIZE,
				abp->b_bcount / PAGESIZE, RDONLY);
		    AFS_GLOCK();
		}
	    }
#endif
	}
    } else {
	tuio.afsio_iov = tiovec;
	tuio.afsio_iovcnt = 1;
#if defined(AFS_SUN5_ENV)
#ifdef AFS_64BIT_CLIENT
#ifdef AFS_SUN5_ENV
	tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
#else
	tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
#endif
#else /* AFS_64BIT_CLIENT */
	tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
#endif /* AFS_64BIT_CLIENT */
#ifdef	AFS_SUN5_ENV
#ifdef	AFS_SUN59_ENV
	tuio.uio_limit = curproc->p_fsz_ctl.rlim_cur;
#else
	tuio.uio_limit = u.u_rlimit[RLIMIT_FSIZE].rlim_cur;
#endif
#endif
#else
	tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
#endif
#if defined(AFS_NBSD40_ENV)
	UIO_SETUP_SYSSPACE(&tuio);
#else
	tuio.afsio_seg = AFS_UIOSYS;
#endif
#ifdef AFS_UIOFMODE
	tuio.afsio_fmode = 0;
#endif
#ifdef	AFS_AIX32_ENV
	/*
	 * XXX It this really right? Ideally we should always write block size multiple
	 * and not any arbitrary size, right? XXX
	 */
	len = MIN(len, tvc->f.m.Length - dbtob(abp->b_blkno));
#endif
	tuio.afsio_resid = len;
#if defined(AFS_NBSD40_ENV) || defined(FBSD_STRUCT_BUF_NO_SAVEADDR)
	tiovec[0].iov_base = abp->b_data;
#elif defined(AFS_XBSD_ENV)
	tiovec[0].iov_base = abp->b_saveaddr;
#else
	tiovec[0].iov_base = abp->b_un.b_addr;
#endif /* AFS_XBSD_ENV */
	tiovec[0].iov_len = len;
	/* are user's credentials valid here?  probably, but this
	 * sure seems like the wrong things to do. */
#if	defined(AFS_SUN5_ENV)
	code = afs_nlrdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
#else
	code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
#endif
    }

#if defined (AFS_XBSD_ENV)
    if (code) {
	abp->b_error = code;
#if !defined(AFS_FBSD_ENV) && !defined(AFS_NBSD50_ENV)
	abp->b_flags |= B_ERROR;
#endif
    }
#endif

#if defined(AFS_AIX32_ENV)
    crfree(credp);
#elif defined(AFS_FBSD60_ENV)
    (*abp->b_iodone)(abp);
#elif defined(AFS_FBSD_ENV)
    biodone(&abp->b_io);
#elif defined(AFS_NBSD40_ENV)
    abp->b_resid = tuio.uio_resid;
    biodone(abp);
#elif defined(AFS_XBSD_ENV)
    biodone(abp);
#elif !defined(AFS_SUN5_ENV)
    iodone(abp);
#endif

    afs_Trace3(afs_iclSetp, CM_TRACE_STRATEGYDONE, ICL_TYPE_POINTER, tvc,
	       ICL_TYPE_INT32, code, ICL_TYPE_LONG, tuio.afsio_resid);
    return code;
}

#endif /* !AFS_HPUX_ENV  && !AFS_SGI_ENV && !AFS_LINUX20_ENV */
Commit	Line	Data
805e021f CE	1	/*
	2	* Copyright 2000, International Business Machines Corporation and others.
	3	* All Rights Reserved.
	4	*
	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
	8	*/
	9
	10	/*
	11	* Implements:
	12	* afs_ustrategy
	13	*/
	14
	15	#include <afsconfig.h>
	16	#include "afs/param.h"
	17
	18
	19	#if !defined(AFS_HPUX_ENV) && !defined(AFS_SGI_ENV) && !defined(AFS_LINUX20_ENV) && !defined(AFS_DARWIN80_ENV)
	20
	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"
	27
	28
	29
	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)
	32	#else
	33	int afs_ustrategy(struct buf *abp)
	34	#endif
	35	{
	36	afs_int32 code;
	37	struct uio tuio;
	38	struct iovec tiovec[1];
	39	struct vcache *tvc = VTOAFS(abp->b_vp);
	40	afs_int32 len = abp->b_bcount;
	41	#ifdef AFS_AIX41_ENV
	42	struct ucred *credp;
	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;
	47	#endif
	48
	49	memset(&tuio, 0, sizeof(tuio));
	50	memset(&tiovec, 0, sizeof(tiovec));
	51
	52	AFS_STATCNT(afs_ustrategy);
	53	#ifdef AFS_AIX41_ENV
	54	/*
	55	* So that it won't change while reading it
	56	*/
	57	ObtainReadLock(&tvc->lock);
	58	if (tvc->credp) {
	59	credp = tvc->credp;
	60	crhold(credp);
	61	} else {
	62	credp = crref();
	63	}
	64	ReleaseReadLock(&tvc->lock);
65	osi_Assert(credp);
66	#endif
67	#ifdef AFS_FBSD_ENV
68	if (abp->b_iocmd == BIO_READ) {
69	#else
70	if ((abp->b_flags & B_READ) == B_READ) {
71	#endif
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
75	* are from u area??
76	*/
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
81	# ifdef AFS_SUN5_ENV
82	tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
83	# else
84	tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
85	# endif
86	# else /* AFS_64BIT_CLIENT */
87	tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
88	# endif /* AFS_64BIT_CLIENT */
89	#else
90	tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
91	#endif
92	#if defined(AFS_NBSD40_ENV)
93	UIO_SETUP_SYSSPACE(&tuio);
94	#else
95	tuio.afsio_seg = AFS_UIOSYS;
96	#endif
97	#ifdef AFS_UIOFMODE
98	tuio.afsio_fmode = 0;
99	#endif
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;
105	#else
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);
113	#else
114	code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_READ, 0, credp);
115	#endif
116	if (code == 0) {
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,
120	tuio.afsio_resid);
121	#elif defined(AFS_XBSD_ENV)
122	memset(abp->b_saveaddr + abp->b_bcount - tuio.afsio_resid, 0,
123	tuio.afsio_resid);
124	#else
125	memset(abp->b_un.b_addr + abp->b_bcount - tuio.afsio_resid, 0,
126	tuio.afsio_resid);
127	#endif /* AFS_XBSD_ENV */
128	#ifdef AFS_AIX32_ENV
129	/*
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
133	*/
134	if (dbtob(abp->b_blkno) + abp->b_bcount > tvc->f.m.Length) {
135	if ((abp->b_flags & B_PFSTORE) == 0) {
136	AFS_GUNLOCK();
137	vm_protectp(tvc->segid, dbtob(abp->b_blkno) / PAGESIZE,
138	abp->b_bcount / PAGESIZE, RDONLY);
139	AFS_GLOCK();
140	}
141	}
142	#endif
143	}
144	} else {
145	tuio.afsio_iov = tiovec;
146	tuio.afsio_iovcnt = 1;
147	#if defined(AFS_SUN5_ENV)
148	#ifdef AFS_64BIT_CLIENT
149	#ifdef AFS_SUN5_ENV
150	tuio.afsio_offset = (afs_offs_t) ldbtob(abp->b_lblkno);
151	#else
152	tuio.afsio_offset = (afs_offs_t) dbtob(abp->b_blkno);
153	#endif
154	#else /* AFS_64BIT_CLIENT */
155	tuio.afsio_offset = (u_int) dbtob(abp->b_blkno);
156	#endif /* AFS_64BIT_CLIENT */
157	#ifdef AFS_SUN5_ENV
158	#ifdef AFS_SUN59_ENV
159	tuio.uio_limit = curproc->p_fsz_ctl.rlim_cur;
160	#else
161	tuio.uio_limit = u.u_rlimit[RLIMIT_FSIZE].rlim_cur;
162	#endif
163	#endif
164	#else
165	tuio.afsio_offset = DEV_BSIZE * abp->b_blkno;
166	#endif
167	#if defined(AFS_NBSD40_ENV)
168	UIO_SETUP_SYSSPACE(&tuio);
169	#else
170	tuio.afsio_seg = AFS_UIOSYS;
171	#endif
172	#ifdef AFS_UIOFMODE
173	tuio.afsio_fmode = 0;
174	#endif
175	#ifdef AFS_AIX32_ENV
176	/*
177	* XXX It this really right? Ideally we should always write block size multiple
178	* and not any arbitrary size, right? XXX
179	*/
180	len = MIN(len, tvc->f.m.Length - dbtob(abp->b_blkno));
181	#endif
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;
187	#else
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);
195	#else
196	code = afs_rdwr(VTOAFS(abp->b_vp), &tuio, UIO_WRITE, 0, credp);
197	#endif
198	}
199
200	#if defined (AFS_XBSD_ENV)
201	if (code) {
202	abp->b_error = code;
203	#if !defined(AFS_FBSD_ENV) && !defined(AFS_NBSD50_ENV)
204	abp->b_flags \|= B_ERROR;
205	#endif
206	}
207	#endif
208
209	#if defined(AFS_AIX32_ENV)
210	crfree(credp);
211	#elif defined(AFS_FBSD60_ENV)
212	(*abp->b_iodone)(abp);
213	#elif defined(AFS_FBSD_ENV)
214	biodone(&abp->b_io);
215	#elif defined(AFS_NBSD40_ENV)
216	abp->b_resid = tuio.uio_resid;
217	biodone(abp);
218	#elif defined(AFS_XBSD_ENV)
219	biodone(abp);
220	#elif !defined(AFS_SUN5_ENV)
221	iodone(abp);
222	#endif
223
224	afs_Trace3(afs_iclSetp, CM_TRACE_STRATEGYDONE, ICL_TYPE_POINTER, tvc,
225	ICL_TYPE_INT32, code, ICL_TYPE_LONG, tuio.afsio_resid);
226	return code;
227	}
228
229	#endif /* !AFS_HPUX_ENV && !AFS_SGI_ENV && !AFS_LINUX20_ENV */