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source: rtems/cpukit/libfs/src/nfsclient/src/nfs.c @ eea48e2f

4.104.115

Last change on this file since eea48e2f was f7449929, checked in by Ralf Corsepius <ralf.corsepius@…>, on 05/27/10 at 16:17:44

2010-05-27 Ralf Corsépius <ralf.corsepius@…>

libfs/src/nfsclient/src/nfs.c: Use uint32_t instead of u_int_t for readarg and writearg.

Property mode set to 100644

File size: 80.8 KB

Line
1	/* $Id$ */
2
3	/* NFS client implementation for RTEMS; hooks into the RTEMS filesystem */
4
5	/* Author: Till Straumann <strauman@slac.stanford.edu> 2002 */
6
7	/*
8	* Authorship
9	* ----------
10	* This software (NFS-2 client implementation for RTEMS) was created by
11	* Till Straumann <strauman@slac.stanford.edu>, 2002-2007,
12	* Stanford Linear Accelerator Center, Stanford University.
13	*
14	* Acknowledgement of sponsorship
15	* ------------------------------
16	* The NFS-2 client implementation for RTEMS was produced by
17	* the Stanford Linear Accelerator Center, Stanford University,
18	* under Contract DE-AC03-76SFO0515 with the Department of Energy.
19	*
20	* Government disclaimer of liability
21	* ----------------------------------
22	* Neither the United States nor the United States Department of Energy,
23	* nor any of their employees, makes any warranty, express or implied, or
24	* assumes any legal liability or responsibility for the accuracy,
25	* completeness, or usefulness of any data, apparatus, product, or process
26	* disclosed, or represents that its use would not infringe privately owned
27	* rights.
28	*
29	* Stanford disclaimer of liability
30	* --------------------------------
31	* Stanford University makes no representations or warranties, express or
32	* implied, nor assumes any liability for the use of this software.
33	*
34	* Stanford disclaimer of copyright
35	* --------------------------------
36	* Stanford University, owner of the copyright, hereby disclaims its
37	* copyright and all other rights in this software. Hence, anyone may
38	* freely use it for any purpose without restriction.
39	*
40	* Maintenance of notices
41	* ----------------------
42	* In the interest of clarity regarding the origin and status of this
43	* SLAC software, this and all the preceding Stanford University notices
44	* are to remain affixed to any copy or derivative of this software made
45	* or distributed by the recipient and are to be affixed to any copy of
46	* software made or distributed by the recipient that contains a copy or
47	* derivative of this software.
48	*
49	* ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03
50	*/
51
52	#ifdef HAVE_CONFIG_H
53	#include <config.h>
54	#endif
55
56	#include <rtems.h>
57	#include <rtems/libio.h>
58	#include <rtems/libio_.h>
59	#include <rtems/seterr.h>
60	#include <string.h>
61	#include <stdio.h>
62	#include <stdlib.h>
63	#include <assert.h>
64	#include <sys/stat.h>
65	#include <dirent.h>
66	#include <netdb.h>
67	#include <ctype.h>
68	#include <netinet/in.h>
69	#include <arpa/inet.h>
70
71	#include <nfs_prot.h>
72	#include <mount_prot.h>
73
74	#include "rpcio.h"
75
76	/* Configurable parameters */
77
78	/* Estimated average length of a filename (including terminating 0).
79	* This was calculated by doing
80	*
81	* find <some root> -print -exec basename '{}' \; > feil
82	* wc feil
83	*
84	* AVG_NAMLEN = (num_chars + num_lines)/num_lines
85	*/
86	#define CONFIG_AVG_NAMLEN 10
87
88	#define CONFIG_NFS_SMALL_XACT_SIZE 800 /* size of RPC arguments for non-write ops */
89	/* lifetime of NFS attributes in a NfsNode;
90	* the time is in seconds and the lifetime is
91	* infinite if the symbol is #undef
92	*/
93	#define CONFIG_ATTR_LIFETIME 10/secs/
94
95	/*
96	* The 'st_blksize' (stat(2)) value this nfs
97	* client should report. If set to zero then the server's fattr data
98	* is passed throught which is not necessary optimal.
99	* Newlib's stdio uses 'st_blksize' (if built with HAVE_BLKSIZE defined)
100	* to size the default buffer.
101	* Due to the overhead of NFS it is probably better to use the maximum
102	* size of an NFS read request (8k) rather than the optimal block
103	* size on the server.
104	* This value can be overridden at run-time by setting the global
105	* variable 'nfsStBlksize'.
106	* Thanks to Steven Johnson <sjohnson@sakuraindustries.com> for helping
107	* working on this issue.
108	*/
109	#define DEFAULT_NFS_ST_BLKSIZE NFS_MAXDATA
110
111	/* dont change this without changing the maximal write size */
112	#define CONFIG_NFS_BIG_XACT_SIZE UDPMSGSIZE /* dont change this */
113
114	/* The real values for these are specified further down */
115	#define NFSCALL_TIMEOUT (&_nfscalltimeout)
116	#define MNTCALL_TIMEOUT (&_nfscalltimeout)
117	static struct timeval _nfscalltimeout = { 10, 0 }; /* {secs, us } */
118
119	/* More or less fixed constants; in particular, NFS3 is not supported */
120	#define DELIM '/'
121	#define HOSTDELIM ':'
122	#define UPDIR ".."
123	#define UIDSEP '@'
124	#define NFS_VERSION_2 NFS_VERSION
125
126	/* we use a dynamically assigned major number */
127	#define NFS_MAJOR (nfsGlob.nfs_major)
128
129
130	/* NOTE: RTEMS (ss-20020301) uses a 'short st_ino' type :-( but the
131	* NFS fileid is 32 bit. [Later versions of RTEMS have fixed this;
132	* nfsInit() issues a warning if you run a version with 'short st_ino'.]
133	*
134	* As a workarount, we merge the upper 16bits of the fileid into the
135	* minor device no. Hence, it is still possible to uniquely identify
136	* a file by looking at its device number (major = nfs, minor = part
137	* of the fileid + our 'nfs-id' identifier).
138	*
139	* This has an impact on performance, as e.g. getcwd() stats() all
140	* directory entries when it believes it has crossed a mount point
141	* (a.st_dev != b.st_dev).
142	*
143	* OTOH, it also might cause node comparison failure! E.g. 'getcwd()'
144	* assumes that two nodes residing in the same directory must be located
145	* on the same device and hence compares 'st_ino' only.
146	* If two files in the same directory have the same inode number
147	* modulo 2^16, they will be considered equal (although their device
148	* number doesn't match - getcwd doesn't look at it).
149	*
150	* Other software might or might not be affected.
151	*
152	* The only clean solution to this problem is bumping up the size of
153	* 'ino_t' at least to 'long'.
154	* Note that this requires _all_ software (libraries etc.) to be
155	* recompiled.
156	*/
157
158	#define NFS_MAKE_DEV_T_INO_HACK(node) \
159	rtems_filesystem_make_dev_t( NFS_MAJOR, \
160	(((rtems_device_minor_number)((node)->nfs->id))<<16) \| (((rtems_device_minor_number)SERP_ATTR((node)).fileid) >> 16) )
161
162	/* use our 'nfs id' and the server's fsid for the minor device number
163	* this should be fairly unique
164	*/
165	#define NFS_MAKE_DEV_T(node) \
166	rtems_filesystem_make_dev_t( NFS_MAJOR, \
167	(((rtems_device_minor_number)((node)->nfs->id))<<16) \| (SERP_ATTR((node)).fsid & (((rtems_device_minor_number)1<<16)-1)) )
168
169	#define DIRENT_HEADER_SIZE ( sizeof(struct dirent) - \
170	sizeof( ((struct dirent *)0)->d_name ) )
171
172
173	/* debugging flags */
174	#define DEBUG_COUNT_NODES (1<<0)
175	#define DEBUG_TRACK_NODES (1<<1)
176	#define DEBUG_EVALPATH (1<<2)
177	#define DEBUG_READDIR (1<<3)
178	#define DEBUG_SYSCALLS (1<<4)
179
180	/* #define DEBUG ( DEBUG_SYSCALLS \| DEBUG_COUNT_NODES ) */
181
182	#ifdef DEBUG
183	#define STATIC
184	#else
185	#define STATIC static
186	#endif
187
188	#define MUTEX_ATTRIBUTES (RTEMS_LOCAL \| \
189	RTEMS_PRIORITY \| \
190	RTEMS_INHERIT_PRIORITY \| \
191	RTEMS_BINARY_SEMAPHORE)
192
193	#define LOCK(s) do { \
194	rtems_semaphore_obtain((s), \
195	RTEMS_WAIT, \
196	RTEMS_NO_TIMEOUT); \
197	} while (0)
198
199	#define UNLOCK(s) do { rtems_semaphore_release((s)); \
200	} while (0)
201
202	/*****************************************
203	Types with Associated XDR Routines
204	*****************************************/
205
206	/* a string buffer with a maximal length.
207	* If the buffer pointer is NULL, it is updated
208	* with an appropriately allocated area.
209	*/
210	typedef struct strbuf {
211	char *buf;
212	u_int max;
213	} strbuf;
214
215	static bool_t
216	xdr_strbuf(XDR xdrs, strbuf obj)
217	{
218	return xdr_string(xdrs, &obj->buf, obj->max);
219	}
220
221	/* Read 'readlink' results into a 'strbuf'.
222	* This is convenient as it avoids
223	* one extra step of copying / lenght
224	* checking.
225	*/
226	typedef struct readlinkres_strbuf {
227	nfsstat status;
228	strbuf strbuf;
229	} readlinkres_strbuf;
230
231	static bool_t
232	xdr_readlinkres_strbuf(XDR xdrs, readlinkres_strbuf objp)
233	{
234	if ( !xdr_nfsstat(xdrs, &objp->status) )
235	return FALSE;
236
237	if ( NFS_OK == objp->status ) {
238	if ( !xdr_string(xdrs, &objp->strbuf.buf, objp->strbuf.max) )
239	return FALSE;
240	}
241	return TRUE;
242	}
243
244
245	/* DirInfoRec is used instead of dirresargs
246	* to convert recursion into iteration. The
247	* 'rpcgen'erated xdr_dirresargs ends up
248	* doing nested calls when unpacking the
249	* 'next' pointers.
250	*/
251
252	typedef struct DirInfoRec_ {
253	readdirargs readdirargs;
254	/* clone of the 'readdirres' fields;
255	* the cookie is put into the readdirargs above
256	*/
257	nfsstat status;
258	char buf, ptr;
259	int len;
260	bool_t eofreached;
261	} DirInfoRec, *DirInfo;
262
263	/* this deals with one entry / record */
264	static bool_t
265	xdr_dir_info_entry(XDR *xdrs, DirInfo di)
266	{
267	union {
268	char nambuf[NFS_MAXNAMLEN+1];
269	nfscookie cookie;
270	} dummy;
271	struct dirent pde = (struct dirent )di->ptr;
272	u_int fileid;
273	char *name;
274	register int nlen = 0,len,naligned = 0;
275	nfscookie *pcookie;
276
277	len = di->len;
278
279	if ( !xdr_u_int(xdrs, &fileid) )
280	return FALSE;
281
282	/* we must pass the address of a char* */
283	name = (len > NFS_MAXNAMLEN) ? pde->d_name : dummy.nambuf;
284
285	if ( !xdr_filename(xdrs, &name) ) {
286	return FALSE;
287	}
288
289	if (len >= 0) {
290	nlen = strlen(name);
291	naligned = nlen + 1 /* string delimiter / + 3 / alignment */;
292	naligned &= ~3;
293	len -= naligned;
294	}
295
296	/* if the cookie goes into the DirInfo, we hope this doesn't fail
297	* - the caller ends up with an invalid readdirargs cookie otherwise...
298	*/
299	pcookie = (len >= 0) ? &di->readdirargs.cookie : &dummy.cookie;
300	if ( !xdr_nfscookie(xdrs, pcookie) ) {
301	return FALSE;
302	}
303
304	di->len = len;
305	/* adjust the buffer pointer */
306	if (len >= 0) {
307	pde->d_ino = fileid;
308	pde->d_namlen = nlen;
309	pde->d_off = di->ptr - di->buf;
310	if (name == dummy.nambuf) {
311	memcpy(pde->d_name, dummy.nambuf, nlen + 1);
312	}
313	pde->d_reclen = DIRENT_HEADER_SIZE + naligned;
314	di->ptr += pde->d_reclen;
315	}
316
317	return TRUE;
318	}
319
320	/* this routine loops over all entries */
321	static bool_t
322	xdr_dir_info(XDR *xdrs, DirInfo di)
323	{
324	DirInfo dip;
325
326	if ( !xdr_nfsstat(xdrs, &di->status) )
327	return FALSE;
328
329	if ( NFS_OK != di->status )
330	return TRUE;
331
332	dip = di;
333
334	while (dip) {
335	/* reserve space for the dirent 'header' - we assume it's word aligned! */
336	#ifdef DEBUG
337	assert( DIRENT_HEADER_SIZE % 4 == 0 );
338	#endif
339	dip->len -= DIRENT_HEADER_SIZE;
340
341	/* we pass a 0 size - size is unused since
342	* we always pass a non-NULL pointer
343	*/
344	if ( !xdr_pointer(xdrs, (void)&dip, 0 / size */, (xdrproc_t)xdr_dir_info_entry) )
345	return FALSE;
346	}
347
348	if ( ! xdr_bool(xdrs, &di->eofreached) )
349	return FALSE;
350
351	/* if everything fits into the XDR buffer but not the user's buffer,
352	* they must resume reading from where xdr_dir_info_entry() started
353	* skipping and 'eofreached' needs to be adjusted
354	*/
355	if ( di->len < 0 && di->eofreached )
356	di->eofreached = FALSE;
357
358	return TRUE;
359	}
360
361
362	/* a type better suited for node operations
363	* than diropres.
364	* fattr and fhs are swapped so parts of this
365	* structure may be used as a diroparg which
366	* is practical when looking up paths.
367	*/
368
369	/* Macro for accessing serporid fields
370	*/
371	#define SERP_ARGS(node) ((node)->serporid.serporid_u.serporid.arg_u)
372	#define SERP_ATTR(node) ((node)->serporid.serporid_u.serporid.attributes)
373	#define SERP_FILE(node) ((node)->serporid.serporid_u.serporid.file)
374
375
376	typedef struct serporidok {
377	fattr attributes;
378	nfs_fh file;
379	union {
380	struct {
381	filename name;
382	} diroparg;
383	struct {
384	sattr attributes;
385	} sattrarg;
386	struct {
387	uint32_t offset;
388	uint32_t count;
389	uint32_t totalcount;
390	} readarg;
391	struct {
392	uint32_t beginoffset;
393	uint32_t offset;
394	uint32_t totalcount;
395	struct {
396	uint32_t data_len;
397	char* data_val;
398	} data;
399	} writearg;
400	struct {
401	filename name;
402	sattr attributes;
403	} createarg;
404	struct {
405	filename name;
406	diropargs to;
407	} renamearg;
408	struct {
409	diropargs to;
410	} linkarg;
411	struct {
412	filename name;
413	nfspath to;
414	sattr attributes;
415	} symlinkarg;
416	struct {
417	nfscookie cookie;
418	uint32_t count;
419	} readdirarg;
420	} arg_u;
421	} serporidok;
422
423	typedef struct serporid {
424	nfsstat status;
425	union {
426	serporidok serporid;
427	} serporid_u;
428	} serporid;
429
430	/* an XDR routine to encode/decode the inverted diropres
431	* into an nfsnodestat;
432	*
433	* NOTE: this routine only acts on
434	* - 'serporid.status'
435	* - 'serporid.file'
436	* - 'serporid.attributes'
437	* and leaves the 'arg_u' alone.
438	*
439	* The idea is that a 'diropres' is read into 'serporid'
440	* which can then be used as an argument to subsequent
441	* NFS-RPCs (after filling in the node's arg_u).
442	*/
443	static bool_t
444	xdr_serporidok(XDR xdrs, serporidok objp)
445	{
446	if (!xdr_nfs_fh (xdrs, &objp->file))
447	return FALSE;
448	if (!xdr_fattr (xdrs, &objp->attributes))
449	return FALSE;
450	return TRUE;
451	}
452
453	static bool_t
454	xdr_serporid(XDR xdrs, serporid objp)
455	{
456	if (!xdr_nfsstat (xdrs, &objp->status))
457	return FALSE;
458	switch (objp->status) {
459	case NFS_OK:
460	if (!xdr_serporidok(xdrs, &objp->serporid_u.serporid))
461	return FALSE;
462	break;
463	default:
464	break;
465	}
466	return TRUE;
467	}
468
469	/*****************************************
470	Data Structures and Types
471	*****************************************/
472
473	/* 'time()' hack with less overhead; */
474
475	/* assume reading a long word is atomic */
476	#define READ_LONG_IS_ATOMIC
477
478	typedef uint32_t TimeStamp;
479
480	static inline TimeStamp
481	nowSeconds(void)
482	{
483	rtems_interval rval;
484	rtems_clock_get_seconds_since_epoch( &rval );
485	return rval;
486	}
487
488
489	/* Per mounted FS structure */
490	typedef struct NfsRec_ {
491	/* the NFS server we're talking to.
492	*/
493	RpcUdpServer server;
494	/* statistics; how many NfsNodes are
495	* currently alive.
496	*/
497	volatile int nodesInUse;
498	#if DEBUG & DEBUG_COUNT_NODES
499	/* statistics; how many 'NfsNode.str'
500	* strings are currently allocated.
501	*/
502	volatile int stringsInUse;
503	#endif
504	/* A small number who uniquely
505	* identifies a mounted NFS within
506	* this driver (i.e. this NfsRec).
507	* Each time a NFS is mounted, the
508	* global ID counter is incremented
509	* and its value is assigned to the
510	* newly created NfsRec.
511	*/
512	u_short id;
513	/* Our RTEMS filesystem mt_entry
514	*/
515	rtems_filesystem_mount_table_entry_t *mt_entry;
516	/* Next NfsRec on a linked list who
517	* is anchored at nfsGlob
518	*/
519	struct NfsRec_ *next;
520	/* Who we pretend we are
521	*/
522	u_long uid,gid;
523	} NfsRec, *Nfs;
524
525	typedef struct NfsNodeRec_ {
526	/* This holds this node's attributes
527	* (stats) and its nfs filehandle.
528	* It also contains room for nfs rpc
529	* arguments.
530	*/
531	serporid serporid;
532	/* The arguments we used when doing
533	* the 'lookup' call for this node.
534	* We need this information (especially
535	* the directory FH) for performing
536	* certain operations on this
537	* node (in particular: for unlinking
538	* it from a parent directory)
539	*/
540	diropargs args;
541	/* FS this node belongs to
542	*/
543	Nfs nfs;
544	/* A buffer for the string the
545	* args.name points to.
546	* We need this because args.name might
547	* temporarily point to strings on the
548	* stack. Duplicates are allocated from
549	* the heap and attached to 'str' so
550	* they can be released as appropriate.
551	*/
552	char *str;
553	/* A timestamp for the stats
554	*/
555	TimeStamp age;
556	} NfsNodeRec, *NfsNode;
557
558	/*****************************************
559	Forward Declarations
560	*****************************************/
561
562	static int nfs_readlink(
563	rtems_filesystem_location_info_t loc, / IN */
564	char buf, / OUT */
565	size_t len
566	);
567
568	static int updateAttr(NfsNode node, int force);
569
570	/* Mask bits when setting attributes.
571	* Only the 'arg' fields with their
572	* corresponding bit set in the mask
573	* will be used. The others are left
574	* unchanged.
575	* The 'TOUCH' bits instruct nfs_sattr()
576	* to update the respective time
577	* fields to the current time
578	*/
579	#define SATTR_MODE (1<<0)
580	#define SATTR_UID (1<<1)
581	#define SATTR_GID (1<<2)
582	#define SATTR_SIZE (1<<3)
583	#define SATTR_ATIME (1<<4)
584	#define SATTR_TOUCHA (1<<5)
585	#define SATTR_MTIME (1<<6)
586	#define SATTR_TOUCHM (1<<7)
587	#define SATTR_TOUCH (SATTR_TOUCHM \| SATTR_TOUCHA)
588
589	static int
590	nfs_sattr(NfsNode node, sattr *arg, u_long mask);
591
592	extern struct _rtems_filesystem_operations_table nfs_fs_ops;
593	static struct _rtems_filesystem_file_handlers_r nfs_file_file_handlers;
594	static struct _rtems_filesystem_file_handlers_r nfs_dir_file_handlers;
595	static struct _rtems_filesystem_file_handlers_r nfs_link_file_handlers;
596	static rtems_driver_address_table drvNfs;
597
598	int
599	nfsMountsShow(FILE*);
600
601	rtems_status_code
602	rtems_filesystem_resolve_location(char buf, int len, rtems_filesystem_location_info_t loc);
603
604
605	/*****************************************
606	Inline Routines
607	*****************************************/
608
609
610	/* * * * * * * * * * * * * * * * * *
611	Trivial Operations on a NfsNode
612	* * * * * * * * * * * * * * * * * */
613
614	/* determine if a location 'l' is an NFS root node */
615	static inline int
616	locIsRoot(rtems_filesystem_location_info_t *l)
617	{
618	NfsNode me = (NfsNode) l->node_access;
619	NfsNode r;
620	r = (NfsNode)l->mt_entry->mt_fs_root.node_access;
621	return SERP_ATTR(r).fileid == SERP_ATTR(me).fileid &&
622	SERP_ATTR(r).fsid == SERP_ATTR(me).fsid;
623	}
624
625	/* determine if a location 'l' is an NFS node */
626	static inline int
627	locIsNfs(rtems_filesystem_location_info_t *l)
628	{
629	return l->ops == &nfs_fs_ops;
630	}
631
632	/* determine if two locations refer to the
633	* same entity. We know that 'nfsloc' is a
634	* location inside nfs. However, we needn't
635	* know anything about 'anyloc'.
636	*/
637	static inline int
638	locAreEqual(
639	rtems_filesystem_location_info_t *nfsloc,
640	rtems_filesystem_location_info_t *anyloc
641	)
642	{
643	NfsNode na = (NfsNode) nfsloc->node_access;
644	NfsNode nb;
645
646	if (!locIsNfs(anyloc))
647	return 0;
648
649	nb = (NfsNode) anyloc->node_access;
650
651	if (na->nfs != nb->nfs)
652	return 0;
653
654	updateAttr(nb, 0);
655
656	return SERP_ATTR(na).fileid == SERP_ATTR(nb).fileid &&
657	SERP_ATTR(na).fsid == SERP_ATTR(nb).fsid;
658	}
659
660
661
662	/*****************************************
663	Global Variables
664	*****************************************/
665
666	/* These are (except for MAXNAMLEN/MAXPATHLEN) copied from IMFS */
667
668	static rtems_filesystem_limits_and_options_t
669	nfs_limits_and_options = {
670	5, /* link_max */
671	6, /* max_canon */
672	7, /* max_input */
673	NFS_MAXNAMLEN, /* name_max */
674	NFS_MAXPATHLEN, /* path_max */
675	2, /* pipe_buf */
676	1, /* posix_async_io */
677	2, /* posix_chown_restrictions */
678	3, /* posix_no_trunc */
679	4, /* posix_prio_io */
680	5, /* posix_sync_io */
681	6 /* posix_vdisable */
682	};
683
684	/* size of an encoded 'entry' object */
685	static int dirres_entry_size;
686
687	/* Global stuff and statistics */
688	static struct nfsstats {
689	/* A lock for protecting the
690	* linked ist of mounted NFS
691	* and the num_mounted_fs field
692	*/
693	rtems_id llock;
694	/* A lock for protecting misc
695	* stuff within the driver.
696	* The lock must only be held
697	* for short periods of time.
698	*/
699	rtems_id lock;
700	/* Our major number as assigned
701	* by RTEMS
702	*/
703	rtems_device_major_number nfs_major;
704	/* The number of currently
705	* mounted NFS
706	*/
707	int num_mounted_fs;
708	/* A list of the currently
709	* mounted NFS
710	*/
711	struct NfsRec_ *mounted_fs;
712	/* A counter for allocating
713	* unique IDs to each mounted
714	* NFS.
715	* Assume we are not going to
716	* do more than 16k mounts
717	* during the system lifetime
718	*/
719	u_short fs_ids;
720	} nfsGlob = {0, 0, 0, 0, 0, 0};
721
722	/*
723	* Global variable to tune the 'st_blksize' (stat(2)) value this nfs
724	* client should report.
725	* size on the server.
726	*/
727	#ifndef DEFAULT_NFS_ST_BLKSIZE
728	#define DEFAULT_NFS_ST_BLKSIZE NFS_MAXDATA
729	#endif
730	int nfsStBlksize = DEFAULT_NFS_ST_BLKSIZE;
731
732	/* Two pools of RPC transactions;
733	* One with small send buffers
734	* the other with a big one.
735	* The actual size of the small
736	* buffer is configurable (see top).
737	*
738	* Note: The RX buffers are always
739	* big
740	*/
741	static RpcUdpXactPool smallPool = 0;
742	static RpcUdpXactPool bigPool = 0;
743
744
745	/*****************************************
746	Implementation
747	*****************************************/
748
749	/* Create a Nfs object. This is
750	* per-mounted NFS information.
751	*
752	* ARGS: The Nfs server handle.
753	*
754	* RETURNS: Nfs on success,
755	* NULL on failure with
756	* errno set
757	*
758	* NOTE: The submitted server
759	* object is 'owned' by
760	* this Nfs and will be
761	* destroyed by nfsDestroy()
762	*/
763	static Nfs
764	nfsCreate(RpcUdpServer server)
765	{
766	Nfs rval = calloc(1,sizeof(*rval));
767
768	if (rval) {
769	rval->server = server;
770	LOCK(nfsGlob.llock);
771	rval->next = nfsGlob.mounted_fs;
772	nfsGlob.mounted_fs = rval;
773	UNLOCK(nfsGlob.llock);
774	} else {
775	errno = ENOMEM;
776	}
777	return rval;
778	}
779
780	/* Destroy an Nfs object and
781	* its associated server
782	*/
783	static void
784	nfsDestroy(Nfs nfs)
785	{
786	register Nfs prev;
787	if (!nfs)
788	return;
789
790	LOCK(nfsGlob.llock);
791	if (nfs == nfsGlob.mounted_fs)
792	nfsGlob.mounted_fs = nfs->next;
793	else {
794	for (prev = nfsGlob.mounted_fs;
795	prev && prev->next != nfs;
796	prev = prev->next)
797	/* nothing else to do */;
798	assert( prev );
799	prev->next = nfs->next;
800	}
801	UNLOCK(nfsGlob.llock);
802
803	nfs->next = 0; /* paranoia */
804	rpcUdpServerDestroy(nfs->server);
805	free(nfs);
806	}
807
808	/*
809	* Create a Node. The node will
810	* be associated with a particular
811	* mounted NFS identified by 'nfs'
812	* Optionally, a NFS file handle
813	* may be copied into this node.
814	*
815	* ARGS: nfs of the NFS this node
816	* belongs to.
817	* NFS file handle identifying
818	* this node.
819	* RETURNS: node on success,
820	* NULL on failure with errno
821	* set.
822	*
823	* NOTE: The caller of this routine
824	* is responsible for copying
825	* a NFS file handle if she
826	* choses to pass a NULL fh.
827	*
828	* The driver code assumes the
829	* a node always has a valid
830	* NFS filehandle and file
831	* attributes (unless the latter
832	* are aged).
833	*/
834	static NfsNode
835	nfsNodeCreate(Nfs nfs, fhandle *fh)
836	{
837	NfsNode rval = malloc(sizeof(*rval));
838	unsigned long flags;
839
840	#if DEBUG & DEBUG_TRACK_NODES
841	fprintf(stderr,"NFS: creating a node\n");
842	#endif
843
844	if (rval) {
845	if (fh)
846	memcpy( &SERP_FILE(rval), fh, sizeof(*fh) );
847	rtems_interrupt_disable(flags);
848	nfs->nodesInUse++;
849	rtems_interrupt_enable(flags);
850	rval->nfs = nfs;
851	rval->str = 0;
852	} else {
853	errno = ENOMEM;
854	}
855
856	return rval;
857	}
858
859	/* destroy a node */
860	static void
861	nfsNodeDestroy(NfsNode node)
862	{
863	unsigned long flags;
864
865	#if DEBUG & DEBUG_TRACK_NODES
866	fprintf(stderr,"NFS: destroying a node\n");
867	#endif
868	#if 0
869	if (!node)
870	return;
871	/* this probably does nothing... */
872	xdr_free(xdr_serporid, &node->serporid);
873	#endif
874
875	rtems_interrupt_disable(flags);
876	node->nfs->nodesInUse--;
877	#if DEBUG & DEBUG_COUNT_NODES
878	if (node->str)
879	node->nfs->stringsInUse--;
880	#endif
881	rtems_interrupt_enable(flags);
882
883	if (node->str)
884	free(node->str);
885
886	free(node);
887	}
888
889	/* Clone a given node (AKA copy constructor),
890	* i.e. create an exact copy.
891	*
892	* ARGS: node to clone
893	* RETURNS: new node on success
894	* NULL on failure with errno set.
895	*
896	* NOTE: a string attached to 'str'
897	* is cloned as well. Outdated
898	* attributes (of the new copy
899	* only) will be refreshed
900	* (if unsuccessful, this could
901	* be a reason for failure to
902	* clone a node).
903	*/
904	static NfsNode
905	nfsNodeClone(NfsNode node)
906	{
907	NfsNode rval = nfsNodeCreate(node->nfs, 0);
908
909	if (rval) {
910	rval = node;
911
912	/* must clone the string also */
913	if (node->str) {
914	rval->args.name = rval->str = strdup(node->str);
915	if (!rval->str) {
916	errno = ENOMEM;
917	nfsNodeDestroy(rval);
918	return 0;
919	}
920	#if DEBUG & DEBUG_COUNT_NODES
921	{ unsigned long flags;
922	rtems_interrupt_disable(flags);
923	node->nfs->stringsInUse++;
924	rtems_interrupt_enable(flags);
925	}
926	#endif
927	}
928
929	/* possibly update the stats */
930	if (updateAttr(rval, 0 /* only if necessary */)) {
931	nfsNodeDestroy(rval);
932	return 0;
933	}
934	}
935	return rval;
936	}
937
938	/* Initialize the driver.
939	*
940	* ARGS: depth of the small and big
941	* transaction pools, i.e. how
942	* many transactions (buffers)
943	* should always be kept around.
944	*
945	* (If more transactions are needed,
946	* they are created and destroyed
947	* on the fly).
948	*/
949	void
950	nfsInit(int smallPoolDepth, int bigPoolDepth)
951	{
952	static int initialised = 0;
953	entry dummy;
954	rtems_status_code status;
955
956	if (initialised)
957	return;
958
959	initialised = 1;
960
961	fprintf(stderr,
962	"RTEMS-NFS $Release$, " \
963	"Till Straumann, Stanford/SLAC/SSRL 2002, " \
964	"See LICENSE file for licensing info.\n");
965
966	/* Get a major number */
967
968	if (RTEMS_SUCCESSFUL != rtems_io_register_driver(0, &drvNfs, &nfsGlob.nfs_major)) {
969	fprintf(stderr,"Registering NFS driver failed - %s\n", strerror(errno));
970	return;
971	}
972
973	if (0==smallPoolDepth)
974	smallPoolDepth = 20;
975	if (0==bigPoolDepth)
976	bigPoolDepth = 10;
977
978	/* it's crucial to zero out the 'next' pointer
979	* because it terminates the xdr_entry recursion
980	*
981	* we also must make the filename some non-zero
982	* char pointer!
983	*/
984
985	memset(&dummy, 0, sizeof(dummy));
986
987	dummy.nextentry = 0;
988	dummy.name = "somename"; /* guess average length of a filename */
989	dirres_entry_size = xdr_sizeof((xdrproc_t)xdr_entry, &dummy);
990
991	smallPool = rpcUdpXactPoolCreate(
992	NFS_PROGRAM,
993	NFS_VERSION_2,
994	CONFIG_NFS_SMALL_XACT_SIZE,
995	smallPoolDepth);
996	assert( smallPool );
997
998	bigPool = rpcUdpXactPoolCreate(
999	NFS_PROGRAM,
1000	NFS_VERSION_2,
1001	CONFIG_NFS_BIG_XACT_SIZE,
1002	bigPoolDepth);
1003	assert( bigPool );
1004
1005	status = rtems_semaphore_create(
1006	rtems_build_name('N','F','S','l'),
1007	1,
1008	MUTEX_ATTRIBUTES,
1009	0,
1010	&nfsGlob.llock);
1011	assert( status == RTEMS_SUCCESSFUL );
1012	status = rtems_semaphore_create(
1013	rtems_build_name('N','F','S','m'),
1014	1,
1015	MUTEX_ATTRIBUTES,
1016	0,
1017	&nfsGlob.lock);
1018	assert( status == RTEMS_SUCCESSFUL );
1019
1020	if (sizeof(ino_t) < sizeof(u_int)) {
1021	fprintf(stderr,
1022	"WARNING: Using 'short st_ino' hits performance and may fail to access/find correct files\n");
1023	fprintf(stderr,
1024	"you should fix newlib's sys/stat.h - for now I'll enable a hack...\n");
1025
1026	}
1027	}
1028
1029	/* Driver cleanup code
1030	*/
1031	int
1032	nfsCleanup(void)
1033	{
1034	rtems_id l;
1035	int refuse;
1036
1037	if (!nfsGlob.llock) {
1038	/* registering the driver failed - let them still cleanup */
1039	return 0;
1040	}
1041
1042	LOCK(nfsGlob.llock);
1043	if ( (refuse = nfsGlob.num_mounted_fs) ) {
1044	fprintf(stderr,"Refuse to unload NFS; %i filesystems still mounted.\n",
1045	refuse);
1046	nfsMountsShow(stderr);
1047	/* yes, printing is slow - but since you try to unload the driver,
1048	* you assume nobody is using NFS, so what if they have to wait?
1049	*/
1050	UNLOCK(nfsGlob.llock);
1051	return -1;
1052	}
1053
1054	rtems_semaphore_delete(nfsGlob.lock);
1055	nfsGlob.lock = 0;
1056
1057	/* hold the lock while cleaning up... */
1058
1059	rpcUdpXactPoolDestroy(smallPool);
1060	rpcUdpXactPoolDestroy(bigPool);
1061	l = nfsGlob.llock;
1062	rtems_io_unregister_driver(nfsGlob.nfs_major);
1063
1064	rtems_semaphore_delete(l);
1065	nfsGlob.llock = 0;
1066	return 0;
1067	}
1068
1069	/* NFS RPC wrapper.
1070	*
1071	* ARGS: srvr the NFS server we want to call
1072	* proc the NFSPROC_xx we want to invoke
1073	* xargs xdr routine to wrap the arguments
1074	* pargs pointer to the argument object
1075	* xres xdr routine to unwrap the results
1076	* pres pointer to the result object
1077	*
1078	* RETURNS: 0 on success, -1 on error with errno set.
1079	*
1080	* NOTE: the caller assumes that errno is set to
1081	* a nonzero value if this routine returns
1082	* an error (nonzero return value).
1083	*
1084	* This routine prints RPC error messages to
1085	* stderr.
1086	*/
1087	STATIC int
1088	nfscall(
1089	RpcUdpServer srvr,
1090	int proc,
1091	xdrproc_t xargs,
1092	void * pargs,
1093	xdrproc_t xres,
1094	void * pres)
1095	{
1096	RpcUdpXact xact;
1097	enum clnt_stat stat;
1098	RpcUdpXactPool pool;
1099	int rval = -1;
1100
1101
1102	switch (proc) {
1103	case NFSPROC_SYMLINK:
1104	case NFSPROC_WRITE:
1105	pool = bigPool; break;
1106	default: pool = smallPool; break;
1107	}
1108
1109	xact = rpcUdpXactPoolGet(pool, XactGetCreate);
1110
1111	if ( !xact ) {
1112	errno = ENOMEM;
1113	return -1;
1114	}
1115
1116	if ( RPC_SUCCESS != (stat=rpcUdpSend(
1117	xact,
1118	srvr,
1119	NFSCALL_TIMEOUT,
1120	proc,
1121	xres,
1122	pres,
1123	xargs,
1124	pargs,
1125	0)) \|\|
1126	RPC_SUCCESS != (stat=rpcUdpRcv(xact)) ) {
1127
1128	fprintf(stderr,
1129	"NFS (proc %i) - %s\n",
1130	proc,
1131	clnt_sperrno(stat));
1132
1133	switch (stat) {
1134	/* TODO: this is probably not complete and/or fully accurate */
1135	case RPC_CANTENCODEARGS : errno = EINVAL; break;
1136	case RPC_AUTHERROR : errno = EPERM; break;
1137
1138	case RPC_CANTSEND :
1139	case RPC_CANTRECV : /* hope they have errno set */
1140	case RPC_SYSTEMERROR : break;
1141
1142	default : errno = EIO; break;
1143	}
1144	} else {
1145	rval = 0;
1146	}
1147
1148	/* release the transaction back into the pool */
1149	rpcUdpXactPoolPut(xact);
1150
1151	if (rval && !errno)
1152	errno = EIO;
1153
1154	return rval;
1155	}
1156
1157	/* Check the 'age' of a node's stats
1158	* and read the attributes from the server
1159	* if necessary.
1160	*
1161	* ARGS: node node to update
1162	* force enforce updating ignoring
1163	* the timestamp/age
1164	*
1165	* RETURNS: 0 on success,
1166	* -1 on failure with errno set
1167	*/
1168
1169	static int
1170	updateAttr(NfsNode node, int force)
1171	{
1172
1173	if (force
1174	#ifdef CONFIG_ATTR_LIFETIME
1175	\|\| (nowSeconds() - node->age > CONFIG_ATTR_LIFETIME)
1176	#endif
1177	) {
1178	if ( nfscall(node->nfs->server,
1179	NFSPROC_GETATTR,
1180	(xdrproc_t)xdr_nfs_fh, &SERP_FILE(node),
1181	(xdrproc_t)xdr_attrstat, &node->serporid) )
1182	return -1;
1183
1184	if ( NFS_OK != node->serporid.status ) {
1185	errno = node->serporid.status;
1186	return -1;
1187	}
1188
1189	node->age = nowSeconds();
1190	}
1191
1192	return 0;
1193	}
1194
1195	/*
1196	* IP address helper. Note that we avoid
1197	* gethostbyname() since it's not reentrant.
1198	*
1199	* initialize a sockaddr_in from a
1200	* [<uid>'.'<gid>'@']<host>':'<path>" string and let
1201	* pPath point to the <path> part; retrieve the optional
1202	* uid/gids
1203	*
1204	* ARGS: see description above
1205	*
1206	* RETURNS: 0 on success,
1207	* -1 on failure with errno set
1208	*/
1209	static int
1210	buildIpAddr(u_long puid, u_long pgid,
1211	char *pHost, struct sockaddr_in psa,
1212	char **pPath)
1213	{
1214	char host[30];
1215	char chpt = pPath;
1216	char *path;
1217	int len;
1218
1219	if ( !chpt ) {
1220	errno = EINVAL;
1221	return -1;
1222	}
1223
1224	/* look for the optional uid/gid */
1225	if ( (chpt = strchr(chpt, UIDSEP)) ) {
1226	if ( 2 != sscanf(*pPath,"%li.%li",puid,pgid) ) {
1227	errno = EINVAL;
1228	return -1;
1229	}
1230	chpt++;
1231	} else {
1232	*puid = RPCIOD_DEFAULT_ID;
1233	*pgid = RPCIOD_DEFAULT_ID;
1234	chpt = *pPath;
1235	}
1236	if ( pHost )
1237	*pHost = chpt;
1238
1239	/* split the device name which is in the form
1240	*
1241	* <host_ip> ':' <path>
1242	*
1243	* into its components using a local buffer
1244	*/
1245
1246	if ( !(path = strchr(chpt, HOSTDELIM)) \|\|
1247	(len = path - chpt) >= sizeof(host) - 1 ) {
1248	errno = EINVAL;
1249	return -1;
1250	}
1251	/* point to path beyond ':' */
1252	path++;
1253
1254	strncpy(host, chpt, len);
1255	host[len]=0;
1256
1257	if ( ! inet_pton(AF_INET, host, &psa->sin_addr) ) {
1258	errno = ENXIO;
1259	return -1;
1260	}
1261
1262	psa->sin_family = AF_INET;
1263	psa->sin_port = 0;
1264	*pPath = path;
1265	return 0;
1266	}
1267
1268	/* wrapper similar to nfscall.
1269	* However, since it is not used
1270	* very often, the simpler and less
1271	* efficient rpcUdpCallRp API is used.
1272	*
1273	* ARGS: see 'nfscall()' above
1274	*
1275	* RETURNS: RPC status
1276	*/
1277	static enum clnt_stat
1278	mntcall(
1279	struct sockaddr_in *psrvr,
1280	int proc,
1281	xdrproc_t xargs,
1282	void * pargs,
1283	xdrproc_t xres,
1284	void * pres,
1285	u_long uid,
1286	u_long gid)
1287	{
1288	#ifdef MOUNT_V1_PORT
1289	int retry;
1290	#endif
1291	enum clnt_stat stat = RPC_FAILED;
1292
1293	#ifdef MOUNT_V1_PORT
1294	/* if the portmapper fails, retry a fixed port */
1295	for (retry = 1, psrvr->sin_port = 0, stat = RPC_FAILED;
1296	retry >= 0 && stat;
1297	stat && (psrvr->sin_port = htons(MOUNT_V1_PORT)), retry-- )
1298	#endif
1299	stat = rpcUdpCallRp(
1300	psrvr,
1301	MOUNTPROG,
1302	MOUNTVERS,
1303	proc,
1304	xargs,
1305	pargs,
1306	xres,
1307	pres,
1308	uid,
1309	gid,
1310	MNTCALL_TIMEOUT
1311	);
1312	return stat;
1313	}
1314
1315	/*****************************************
1316	RTEMS File System Operations for NFS
1317	*****************************************/
1318
1319	#if 0 /* for reference */
1320
1321	struct rtems_filesystem_location_info_tt
1322	{
1323	void *node_access;
1324	rtems_filesystem_file_handlers_r *handlers;
1325	rtems_filesystem_operations_table *ops;
1326	rtems_filesystem_mount_table_entry_t *mt_entry;
1327	};
1328
1329	#endif
1330
1331	/*
1332	* Evaluate a path letting 'pathloc' travel along.
1333	*
1334	* The important semantics of this operation are:
1335	*
1336	* If this routine returns -1, the caller assumes
1337	* pathloc to be _invalid_ and hence it will not
1338	* invoke rtems_filesystem_freenode() on it.
1339	*
1340	* OTOH, if evalpath returns 0,
1341	* rtems_filesystem_freenode() will eventually be
1342	* called which results in our freeing the associated
1343	* NfsNode attached to node_access.
1344	*
1345	* Therefore, this routine will _always_ allocate
1346	* a NfsNode and pass it out to *pathloc (provided
1347	* that the evaluation succeeds).
1348	*
1349	* However, if the evaluation finds that it has to
1350	* step across FS boundaries (mount point or a symlink
1351	* pointing outside), the NfsNode is destroyed
1352	* before passing control to the new FS' evalpath_h()
1353	*
1354	*/
1355
1356	union nfs_evalpath_arg {
1357	int i;
1358	const char **c;
1359	};
1360
1361	STATIC int nfs_do_evalpath(
1362	const char pathname, / IN */
1363	int pathnamelen, /* IN */
1364	union nfs_evalpath_arg *arg,
1365	rtems_filesystem_location_info_t pathloc, / IN/OUT */
1366	int forMake
1367	)
1368	{
1369	char del = 0, part;
1370	int e = 0;
1371	NfsNode node = pathloc->node_access;
1372	char *p = malloc(MAXPATHLEN+1);
1373	Nfs nfs = (Nfs)pathloc->mt_entry->fs_info;
1374	RpcUdpServer server = nfs->server;
1375	unsigned long flags;
1376	#if DEBUG & DEBUG_COUNT_NODES
1377	unsigned long niu,siu;
1378	#endif
1379
1380	if ( !p ) {
1381	e = ENOMEM;
1382	goto cleanup;
1383	}
1384	memset(p, 0, MAXPATHLEN+1);
1385	memcpy(p, pathname, pathnamelen);
1386
1387	LOCK(nfsGlob.lock);
1388	node = nfsNodeClone(node);
1389	UNLOCK(nfsGlob.lock);
1390
1391	/* from here on, the NFS is protected from being unmounted
1392	* since the node refcount is > 1
1393	*/
1394
1395	/* clone the node */
1396	if ( !node ) {
1397	/* nodeClone sets errno */
1398	pathloc->node_access = 0;
1399	if ( ! (e = errno) ) {
1400	/* if we have no node, e must not be zero! */
1401	e = ENOMEM;
1402	}
1403	goto cleanup;
1404	}
1405
1406	pathloc->node_access = node;
1407
1408	/* Special case: the RTEMS filesystem code
1409	* may emit '..' on a regular file node to
1410	* find the parent directory :-(.
1411	* (eval.c: rtems_filesystem_evaluate_parent())
1412	* Try to catch this case here:
1413	*/
1414	if ( NFDIR != SERP_ATTR(node).type && '.'==p && '.'==(p+1) ) {
1415	for ( part = p+2; '/'==*part; part++ )
1416	/* skip trailing '/' */;
1417	if ( !*part ) {
1418	/* this is it; back out dir and let them look up the dir itself... */
1419	memcpy( &SERP_FILE(node),
1420	&node->args.dir,
1421	sizeof(node->args.dir));
1422	*(p+1)=0;
1423	}
1424	}
1425
1426	for (part=p; part && *part; part=del) {
1427
1428	if ( NFLNK == SERP_ATTR(node).type ) {
1429	/* follow midpath link */
1430	char *b = malloc(NFS_MAXPATHLEN+1);
1431	int l;
1432
1433	if (!b) {
1434	e = ENOMEM;
1435	goto cleanup;
1436	}
1437	if (nfs_readlink(pathloc, b, NFS_MAXPATHLEN+1)) {
1438	free(b);
1439	e = errno;
1440	goto cleanup;
1441	}
1442
1443	/* prepend the link value to the rest of the path */
1444	if ( (l=strlen(b)) + strlen(part) + 1 > NFS_MAXPATHLEN ) {
1445	free(b);
1446	e = EINVAL;
1447	goto cleanup;
1448	}
1449	/* swap string buffers and reset delimiter */
1450	b[l++] = DELIM;
1451	strcpy(b+l,part);
1452	part = b;
1453	b = p;
1454	p = del = part;
1455
1456	free(b);
1457
1458	/* back up the directory filehandle (only necessary
1459	* if we don't back out to the root
1460	*/
1461	if (! (DELIM == *part) ) {
1462	memcpy( &SERP_FILE(node),
1463	&node->args.dir,
1464	sizeof(node->args.dir));
1465
1466	if (updateAttr(node, 1 /* force */)) {
1467	e = errno;
1468	goto cleanup;
1469	}
1470	}
1471	}
1472
1473	/* find delimiter and eat /// sequences
1474	* (only if we don't restart at the root)
1475	*/
1476	if ( DELIM != *part && (del = strchr(part, DELIM))) {
1477	do {
1478	*del++=0;
1479	} while (DELIM==*del);
1480	}
1481
1482	/* refuse to backup over the root */
1483	if ( 0==strcmp(part,UPDIR)
1484	&& locAreEqual(pathloc, &rtems_filesystem_root) ) {
1485	part++;
1486	}
1487
1488	/* cross mountpoint upwards */
1489	if ( (0==strcmp(part,UPDIR) && locIsRoot(pathloc)) /* cross mountpoint up */
1490	\|\| DELIM == part / link starts at root */
1491	) {
1492	int rval;
1493
1494	#if DEBUG & DEBUG_EVALPATH
1495	fprintf(stderr,
1496	"Crossing mountpoint upwards\n");
1497	#endif
1498
1499	if (DELIM == *part) {
1500	*pathloc = rtems_filesystem_root;
1501	} else {
1502	*pathloc = pathloc->mt_entry->mt_point_node;
1503	/* re-append the rest of the path */
1504	if (del)
1505	while ( 0 == *--del )
1506	*del = DELIM;
1507	}
1508
1509	nfsNodeDestroy(node);
1510
1511	#if DEBUG & DEBUG_EVALPATH
1512	fprintf(stderr,
1513	"Re-evaluating '%s'\n",
1514	part);
1515	#endif
1516
1517	if (forMake)
1518	rval = pathloc->ops->evalformake_h(part, pathloc, arg->c);
1519	else
1520	rval = pathloc->ops->evalpath_h(part, strlen(part), arg->i, pathloc);
1521
1522	free(p);
1523	return rval;
1524	}
1525
1526	/* lookup one element */
1527	SERP_ARGS(node).diroparg.name = part;
1528
1529	/* remember args / directory fh */
1530	memcpy( &node->args, &SERP_FILE(node), sizeof(node->args));
1531
1532	/* don't lookup the item we want to create */
1533	if ( forMake && (!del \|\| !*del) )
1534	break;
1535
1536	#if DEBUG & DEBUG_EVALPATH
1537	fprintf(stderr,"Looking up '%s'\n",part);
1538	#endif
1539
1540	if ( nfscall(server,
1541	NFSPROC_LOOKUP,
1542	(xdrproc_t)xdr_diropargs, &SERP_FILE(node),
1543	(xdrproc_t)xdr_serporid, &node->serporid) \|\|
1544	NFS_OK != (errno=node->serporid.status) ) {
1545	e = errno;
1546	goto cleanup;
1547	}
1548	node->age = nowSeconds();
1549
1550	#if DEBUG & DEBUG_EVALPATH
1551	if (NFLNK == SERP_ATTR(node).type && del) {
1552	fprintf(stderr,
1553	"Following midpath link '%s'\n",
1554	part);
1555	}
1556	#endif
1557
1558	}
1559
1560	if (forMake) {
1561	/* remember the name - do this _before_ copying
1562	* the name to local storage; the caller expects a
1563	* pointer into pathloc
1564	*/
1565	assert( node->args.name );
1566
1567	(const char*)arg = pathname + (node->args.name - p);
1568
1569	#if 0
1570	/* restore the directory node */
1571
1572	memcpy( &SERP_FILE(node),
1573	&node->args.dir,
1574	sizeof(node->args.dir));
1575
1576	if ( (nfscall(nfs->server,
1577	NFSPROC_GETATTR,
1578	(xdrproc_t)xdr_nfs_fh, &SERP_FILE(node),
1579	(xdrproc_t)xdr_attrstat, &node->serporid) && !errno && (errno = EIO)) \|\|
1580	(NFS_OK != (errno=node->serporid.status) ) ) {
1581	goto cleanup;
1582	}
1583	#endif
1584	}
1585
1586	if (locIsRoot(pathloc)) {
1587
1588	/* stupid filesystem code has no 'op' for comparing nodes
1589	* but just compares the 'node_access' pointers.
1590	* Luckily, this is only done for comparing the root nodes.
1591	* Hence, we never give them a copy of the root but always
1592	* the root itself.
1593	*/
1594	pathloc->node_access = pathloc->mt_entry->mt_fs_root.node_access;
1595	/* increment the 'in use' counter since we return one more
1596	* reference to the root node
1597	*/
1598	rtems_interrupt_disable(flags);
1599	nfs->nodesInUse++;
1600	rtems_interrupt_enable(flags);
1601	nfsNodeDestroy(node);
1602
1603
1604	} else {
1605	switch (SERP_ATTR(node).type) {
1606	case NFDIR: pathloc->handlers = &nfs_dir_file_handlers; break;
1607	case NFREG: pathloc->handlers = &nfs_file_file_handlers; break;
1608	case NFLNK: pathloc->handlers = &nfs_link_file_handlers; break;
1609	default: pathloc->handlers = &rtems_filesystem_null_handlers; break;
1610	}
1611	pathloc->node_access = node;
1612
1613	/* remember the name of this directory entry */
1614
1615	if (node->args.name) {
1616	if (node->str) {
1617	#if DEBUG & DEBUG_COUNT_NODES
1618	rtems_interrupt_disable(flags);
1619	nfs->stringsInUse--;
1620	rtems_interrupt_enable(flags);
1621	#endif
1622	free(node->str);
1623	}
1624	node->args.name = node->str = strdup(node->args.name);
1625	if (!node->str) {
1626	e = ENOMEM;
1627	goto cleanup;
1628	}
1629
1630	#if DEBUG & DEBUG_COUNT_NODES
1631	rtems_interrupt_disable(flags);
1632	nfs->stringsInUse++;
1633	rtems_interrupt_enable(flags);
1634	#endif
1635	}
1636
1637	}
1638	node = 0;
1639
1640	e = 0;
1641
1642	cleanup:
1643	free(p);
1644	#if DEBUG & DEBUG_COUNT_NODES
1645	/* cache counters; nfs may be unmounted by other thread after the last
1646	* node is destroyed
1647	*/
1648	niu = nfs->nodesInUse;
1649	siu = nfs->stringsInUse;
1650	#endif
1651	if (node) {
1652	nfsNodeDestroy(node);
1653	pathloc->node_access = 0;
1654	}
1655	#if DEBUG & DEBUG_COUNT_NODES
1656	fprintf(stderr,
1657	"leaving evalpath, in use count is %i nodes, %i strings\n",
1658	niu,siu);
1659	#endif
1660	if (e) {
1661	#if DEBUG & DEBUG_EVALPATH
1662	perror("Evalpath");
1663	#endif
1664	rtems_set_errno_and_return_minus_one(e);
1665	} else {
1666	return 0;
1667	}
1668	}
1669
1670	/* MANDATORY; may set errno=ENOSYS and return -1 */
1671	static int nfs_evalformake(
1672	const char path, / IN */
1673	rtems_filesystem_location_info_t pathloc, / IN/OUT */
1674	const char *pname / OUT */
1675	)
1676	{
1677	union nfs_evalpath_arg args;
1678	args.c = pname;
1679
1680	return nfs_do_evalpath(path, strlen(path), &args, pathloc, 1 /forMake/);
1681	}
1682
1683	static int nfs_evalpath(
1684	const char path, / IN */
1685	size_t pathlen, /* IN */
1686	int flags, /* IN */
1687	rtems_filesystem_location_info_t pathloc / IN/OUT */
1688	)
1689	{
1690	union nfs_evalpath_arg args;
1691	args.i = flags;
1692	return nfs_do_evalpath(path, pathlen, &args, pathloc, 0 /not forMake/);
1693	}
1694
1695
1696	/* create a hard link */
1697
1698	static int nfs_link(
1699	rtems_filesystem_location_info_t to_loc, / IN */
1700	rtems_filesystem_location_info_t parent_loc, / IN */
1701	const char name / IN */
1702	)
1703	{
1704	NfsNode pNode;
1705	nfsstat status;
1706	NfsNode tNode = to_loc->node_access;
1707
1708	#if DEBUG & DEBUG_SYSCALLS
1709	fprintf(stderr,"Creating link '%s'\n",name);
1710	#endif
1711
1712	if ( !locIsNfs(parent_loc) ) {
1713	errno = EXDEV;
1714	return -1;
1715	}
1716
1717	pNode = parent_loc->node_access;
1718	if ( tNode->nfs != pNode->nfs ) {
1719	errno = EXDEV;
1720	return -1;
1721	}
1722	memcpy(&SERP_ARGS(tNode).linkarg.to.dir,
1723	&SERP_FILE(pNode),
1724	sizeof(SERP_FILE(pNode)));
1725
1726	SERP_ARGS(tNode).linkarg.to.name = (filename)name;
1727
1728	if ( nfscall(tNode->nfs->server,
1729	NFSPROC_LINK,
1730	(xdrproc_t)xdr_linkargs, &SERP_FILE(tNode),
1731	(xdrproc_t)xdr_nfsstat, &status)
1732	\|\| (NFS_OK != (errno = status))
1733	) {
1734	#if DEBUG & DEBUG_SYSCALLS
1735	perror("nfs_link");
1736	#endif
1737	return -1;
1738	}
1739
1740	return 0;
1741
1742	}
1743
1744	static int nfs_do_unlink(
1745	rtems_filesystem_location_info_t parent_loc,/ IN */
1746	rtems_filesystem_location_info_t loc, / IN */
1747	int proc
1748	)
1749	{
1750	nfsstat status;
1751	NfsNode node = loc->node_access;
1752	Nfs nfs = node->nfs;
1753	#if DEBUG & DEBUG_SYSCALLS
1754	char *name = NFSPROC_REMOVE == proc ?
1755	"nfs_unlink" : "nfs_rmdir";
1756	#endif
1757
1758	/* The FS generics have determined that pathloc is _not_
1759	* a directory. Hence we may assume that the parent
1760	* is in our NFS.
1761	*/
1762
1763	#if DEBUG & DEBUG_SYSCALLS
1764	assert( node->args.name == node->str && node->str );
1765
1766	fprintf(stderr,"%s '%s'\n", name, node->args.name);
1767	#endif
1768
1769	if ( nfscall(nfs->server,
1770	proc,
1771	(xdrproc_t)xdr_diropargs, &node->args,
1772	(xdrproc_t)xdr_nfsstat, &status)
1773	\|\| (NFS_OK != (errno = status))
1774	) {
1775	#if DEBUG & DEBUG_SYSCALLS
1776	perror(name);
1777	#endif
1778	return -1;
1779	}
1780
1781	return 0;
1782	}
1783
1784	static int nfs_unlink(
1785	rtems_filesystem_location_info_t parent_loc, / IN */
1786	rtems_filesystem_location_info_t loc / IN */
1787	)
1788	{
1789	return nfs_do_unlink(parent_loc, loc, NFSPROC_REMOVE);
1790	}
1791
1792	static int nfs_chown(
1793	rtems_filesystem_location_info_t pathloc, / IN */
1794	uid_t owner, /* IN */
1795	gid_t group /* IN */
1796	)
1797	{
1798	sattr arg;
1799
1800	arg.uid = owner;
1801	arg.gid = group;
1802
1803	return nfs_sattr(pathloc->node_access, &arg, SATTR_UID \| SATTR_GID);
1804
1805	}
1806
1807	/* Cleanup the FS private info attached to pathloc->node_access */
1808	static int nfs_freenode(
1809	rtems_filesystem_location_info_t pathloc / IN */
1810	)
1811	{
1812	Nfs nfs = ((NfsNode)pathloc->node_access)->nfs;
1813
1814	#if DEBUG & DEBUG_COUNT_NODES
1815	/* print counts at entry where they are > 0 so 'nfs' is safe from being destroyed
1816	* and there's no race condition
1817	*/
1818	fprintf(stderr,
1819	"entering freenode, in use count is %i nodes, %i strings\n",
1820	nfs->nodesInUse,
1821	nfs->stringsInUse);
1822	#endif
1823
1824	/* never destroy the root node; it is released by the unmount
1825	* code
1826	*/
1827	if (locIsRoot(pathloc)) {
1828	unsigned long flags;
1829	/* just adjust the references to the root node but
1830	* don't really release it
1831	*/
1832	rtems_interrupt_disable(flags);
1833	nfs->nodesInUse--;
1834	rtems_interrupt_enable(flags);
1835	} else {
1836	nfsNodeDestroy(pathloc->node_access);
1837	pathloc->node_access = 0;
1838	}
1839	return 0;
1840	}
1841
1842	/* NOTE/TODO: mounting on top of NFS is not currently supported
1843	*
1844	* Challenge: stateless protocol. It would be possible to
1845	* delete mount points on the server. We would need some sort
1846	* of a 'garbage collector' looking for dead/unreachable
1847	* mount points and unmounting them.
1848	* Also, the path evaluation routine would have to check
1849	* for crossing mount points. Crossing over from one NFS
1850	* into another NFS could probably handled iteratively
1851	* rather than by recursion.
1852	*/
1853
1854	#ifdef DECLARE_BODY
1855	/* This routine is called when they try to mount something
1856	* on top of THIS filesystem, i.e. if one of our directories
1857	* is used as a mount point
1858	*/
1859	static int nfs_mount(
1860	rtems_filesystem_mount_table_entry_t mt_entry / in */
1861	)DECLARE_BODY
1862	#else
1863	#define nfs_mount 0
1864	#endif
1865
1866	#ifdef DECLARE_BODY
1867	/* This op is called when they try to unmount a FS
1868	* from a mountpoint managed by THIS FS.
1869	*/
1870	static int nfs_unmount(
1871	rtems_filesystem_mount_table_entry_t mt_entry / in */
1872	)DECLARE_BODY
1873	#else
1874	#define nfs_unmount 0
1875	#endif
1876
1877	#if 0
1878
1879	/* for reference (libio.h) */
1880
1881	struct rtems_filesystem_mount_table_entry_tt {
1882	rtems_chain_node Node;
1883	rtems_filesystem_location_info_t mt_point_node;
1884	rtems_filesystem_location_info_t mt_fs_root;
1885	int options;
1886	void *fs_info;
1887
1888	rtems_filesystem_limits_and_options_t pathconf_limits_and_options;
1889
1890	/*
1891	* When someone adds a mounted filesystem on a real device,
1892	* this will need to be used.
1893	*
1894	* The best option long term for this is probably an open file descriptor.
1895	*/
1896	char *dev;
1897	};
1898	#endif
1899
1900
1901	/* This op is called as the last step of mounting this FS */
1902	STATIC int nfs_fsmount_me(
1903	rtems_filesystem_mount_table_entry_t *mt_entry
1904	)
1905	{
1906	char *host;
1907	struct sockaddr_in saddr;
1908	enum clnt_stat stat;
1909	fhstatus fhstat;
1910	u_long uid,gid;
1911	#ifdef NFS_V2_PORT
1912	int retry;
1913	#endif
1914	Nfs nfs = 0;
1915	NfsNode rootNode = 0;
1916	RpcUdpServer nfsServer = 0;
1917	int e = -1;
1918	char *path = mt_entry->dev;
1919
1920
1921	if ( buildIpAddr(&uid, &gid, &host, &saddr, &path) )
1922	return -1;
1923
1924
1925	#ifdef NFS_V2_PORT
1926	/* if the portmapper fails, retry a fixed port */
1927	for (retry = 1, saddr.sin_port = 0, stat = RPC_FAILED;
1928	retry >= 0 && stat;
1929	stat && (saddr.sin_port = htons(NFS_V2_PORT)), retry-- )
1930	#endif
1931	stat = rpcUdpServerCreate(
1932	&saddr,
1933	NFS_PROGRAM,
1934	NFS_VERSION_2,
1935	uid,
1936	gid,
1937	&nfsServer
1938	);
1939
1940	if ( RPC_SUCCESS != stat ) {
1941	fprintf(stderr,
1942	"Unable to contact NFS server - invalid port? (%s)\n",
1943	clnt_sperrno(stat));
1944	e = EPROTONOSUPPORT;
1945	goto cleanup;
1946	}
1947
1948
1949	/* first, try to ping the NFS server by
1950	* calling the NULL proc.
1951	*/
1952	if ( nfscall(nfsServer,
1953	NFSPROC_NULL,
1954	(xdrproc_t)xdr_void, 0,
1955	(xdrproc_t)xdr_void, 0) ) {
1956
1957	fputs("NFS Ping ",stderr);
1958	fwrite(host, 1, path-host-1, stderr);
1959	fprintf(stderr," failed: %s\n", strerror(errno));
1960
1961	e = errno ? errno : EIO;
1962	goto cleanup;
1963	}
1964
1965	/* that seemed to work - we now try the
1966	* actual mount
1967	*/
1968
1969	/* reuse server address but let the mntcall()
1970	* search for the mountd's port
1971	*/
1972	saddr.sin_port = 0;
1973
1974	stat = mntcall( &saddr,
1975	MOUNTPROC_MNT,
1976	(xdrproc_t)xdr_dirpath,
1977	&path,
1978	(xdrproc_t)xdr_fhstatus,
1979	&fhstat,
1980	uid,
1981	gid );
1982
1983	if (stat) {
1984	fprintf(stderr,"MOUNT -- %s\n",clnt_sperrno(stat));
1985	if ( e<=0 )
1986	e = EIO;
1987	goto cleanup;
1988	} else if (NFS_OK != (e=fhstat.fhs_status)) {
1989	fprintf(stderr,"MOUNT: %s\n",strerror(e));
1990	goto cleanup;
1991	}
1992
1993	nfs = nfsCreate(nfsServer);
1994	assert( nfs );
1995	nfsServer = 0;
1996
1997	nfs->uid = uid;
1998	nfs->gid = gid;
1999
2000	/* that seemed to work - we now create the root node
2001	* and we also must obtain the root node attributes
2002	*/
2003	rootNode = nfsNodeCreate(nfs, &fhstat.fhstatus_u.fhs_fhandle);
2004	assert( rootNode );
2005
2006	if ( updateAttr(rootNode, 1 /* force */) ) {
2007	e = errno;
2008	goto cleanup;
2009	}
2010
2011	/* looks good so far */
2012
2013	mt_entry->mt_fs_root.node_access = rootNode;
2014
2015	rootNode = 0;
2016
2017	mt_entry->mt_fs_root.ops = &nfs_fs_ops;
2018	mt_entry->mt_fs_root.handlers = &nfs_dir_file_handlers;
2019	mt_entry->pathconf_limits_and_options = nfs_limits_and_options;
2020
2021	LOCK(nfsGlob.llock);
2022	nfsGlob.num_mounted_fs++;
2023	/* allocate a new ID for this FS */
2024	nfs->id = nfsGlob.fs_ids++;
2025	UNLOCK(nfsGlob.llock);
2026
2027	mt_entry->fs_info = nfs;
2028	nfs->mt_entry = mt_entry;
2029	nfs = 0;
2030
2031	e = 0;
2032
2033	cleanup:
2034	if (nfs)
2035	nfsDestroy(nfs);
2036	if (nfsServer)
2037	rpcUdpServerDestroy(nfsServer);
2038	if (rootNode)
2039	nfsNodeDestroy(rootNode);
2040	if (e)
2041	rtems_set_errno_and_return_minus_one(e);
2042	else
2043	return 0;
2044	}
2045
2046	/* This op is called when they try to unmount THIS fs */
2047	STATIC int nfs_fsunmount_me(
2048	rtems_filesystem_mount_table_entry_t mt_entry / in */
2049	)
2050	{
2051	enum clnt_stat stat;
2052	struct sockaddr_in saddr;
2053	char *path = mt_entry->dev;
2054	int nodesInUse;
2055	u_long uid,gid;
2056	int status;
2057
2058	LOCK(nfsGlob.llock);
2059	nodesInUse = ((Nfs)mt_entry->fs_info)->nodesInUse;
2060
2061	if (nodesInUse > 1 /* one ref to the root node used by us */) {
2062	UNLOCK(nfsGlob.llock);
2063	fprintf(stderr,
2064	"Refuse to unmount; there are still %i nodes in use (1 used by us)\n",
2065	nodesInUse);
2066	rtems_set_errno_and_return_minus_one(EBUSY);
2067	}
2068
2069	status = buildIpAddr(&uid, &gid, 0, &saddr, &path);
2070	assert( !status );
2071
2072	stat = mntcall( &saddr,
2073	MOUNTPROC_UMNT,
2074	(xdrproc_t)xdr_dirpath, &path,
2075	(xdrproc_t)xdr_void, 0,
2076	uid,
2077	gid
2078	);
2079
2080	if (stat) {
2081	UNLOCK(nfsGlob.llock);
2082	fprintf(stderr,"NFS UMOUNT -- %s\n", clnt_sperrno(stat));
2083	errno = EIO;
2084	return -1;
2085	}
2086
2087	nfsNodeDestroy(mt_entry->mt_fs_root.node_access);
2088	mt_entry->mt_fs_root.node_access = 0;
2089
2090	nfsDestroy(mt_entry->fs_info);
2091	mt_entry->fs_info = 0;
2092
2093	nfsGlob.num_mounted_fs--;
2094	UNLOCK(nfsGlob.llock);
2095
2096	return 0;
2097	}
2098
2099	/* OPTIONAL; may be NULL - BUT: CAUTION; mount() doesn't check
2100	* for this handler to be present - a fs bug
2101	* //NOTE: (10/25/2002) patch submitted and probably applied
2102	*/
2103	static rtems_filesystem_node_types_t nfs_node_type(
2104	rtems_filesystem_location_info_t pathloc / in */
2105	)
2106	{
2107	NfsNode node = pathloc->node_access;
2108
2109	if (updateAttr(node, 0 /* only if old */))
2110	return -1;
2111
2112	switch( SERP_ATTR(node).type ) {
2113	default:
2114	/* rtems has no value for 'unknown';
2115	*/
2116	case NFNON:
2117	case NFSOCK:
2118	case NFBAD:
2119	case NFFIFO:
2120	break;
2121
2122
2123	case NFREG: return RTEMS_FILESYSTEM_MEMORY_FILE;
2124	case NFDIR: return RTEMS_FILESYSTEM_DIRECTORY;
2125
2126	case NFBLK:
2127	case NFCHR: return RTEMS_FILESYSTEM_DEVICE;
2128
2129	case NFLNK: return RTEMS_FILESYSTEM_SYM_LINK;
2130	}
2131	return -1;
2132	}
2133
2134	static int nfs_mknod(
2135	const char path, / IN */
2136	mode_t mode, /* IN */
2137	dev_t dev, /* IN */
2138	rtems_filesystem_location_info_t pathloc / IN/OUT */
2139	)
2140	{
2141
2142	struct timeval now;
2143	diropres res;
2144	NfsNode node = pathloc->node_access;
2145	mode_t type = S_IFMT & mode;
2146
2147	if (type != S_IFDIR && type != S_IFREG)
2148	rtems_set_errno_and_return_minus_one(ENOTSUP);
2149
2150	#if DEBUG & DEBUG_SYSCALLS
2151	fprintf(stderr,"nfs_mknod: creating %s\n", path);
2152	#endif
2153
2154	rtems_clock_get_tod_timeval(&now);
2155
2156	SERP_ARGS(node).createarg.name = (filename)path;
2157	SERP_ARGS(node).createarg.attributes.mode = mode;
2158	/* TODO: either use our uid or use the Nfs credentials */
2159	SERP_ARGS(node).createarg.attributes.uid = 0;
2160	SERP_ARGS(node).createarg.attributes.gid = 0;
2161	SERP_ARGS(node).createarg.attributes.size = 0;
2162	SERP_ARGS(node).createarg.attributes.atime.seconds = now.tv_sec;
2163	SERP_ARGS(node).createarg.attributes.atime.useconds = now.tv_usec;
2164	SERP_ARGS(node).createarg.attributes.mtime.seconds = now.tv_sec;
2165	SERP_ARGS(node).createarg.attributes.mtime.useconds = now.tv_usec;
2166
2167	if ( nfscall( node->nfs->server,
2168	NFSPROC_CREATE,
2169	(xdrproc_t)xdr_createargs, &SERP_FILE(node),
2170	(xdrproc_t)xdr_diropres, &res)
2171	\|\| (NFS_OK != (errno = res.status)) ) {
2172	#if DEBUG & DEBUG_SYSCALLS
2173	perror("nfs_mknod");
2174	#endif
2175	return -1;
2176	}
2177
2178	return 0;
2179	}
2180
2181	static int nfs_utime(
2182	rtems_filesystem_location_info_t pathloc, / IN */
2183	time_t actime, /* IN */
2184	time_t modtime /* IN */
2185	)
2186	{
2187	sattr arg;
2188
2189	/* TODO: add rtems EPOCH - UNIX EPOCH seconds */
2190	arg.atime.seconds = actime;
2191	arg.atime.useconds = 0;
2192	arg.mtime.seconds = modtime;
2193	arg.mtime.useconds = 0;
2194
2195	return nfs_sattr(pathloc->node_access, &arg, SATTR_ATIME \| SATTR_MTIME);
2196	}
2197
2198	static int nfs_symlink(
2199	rtems_filesystem_location_info_t loc, / IN */
2200	const char link_name, / IN */
2201	const char *node_name
2202	)
2203	{
2204	struct timeval now;
2205	nfsstat status;
2206	NfsNode node = loc->node_access;
2207
2208
2209	#if DEBUG & DEBUG_SYSCALLS
2210	fprintf(stderr,"nfs_symlink: creating %s -> %s\n", link_name, node_name);
2211	#endif
2212
2213	rtems_clock_get_tod_timeval(&now);
2214
2215	SERP_ARGS(node).symlinkarg.name = (filename)link_name;
2216	SERP_ARGS(node).symlinkarg.to = (nfspath) node_name;
2217
2218	SERP_ARGS(node).symlinkarg.attributes.mode = S_IFLNK \| S_IRWXU \| S_IRWXG \| S_IRWXO;
2219	/* TODO */
2220	SERP_ARGS(node).symlinkarg.attributes.uid = 0;
2221	SERP_ARGS(node).symlinkarg.attributes.gid = 0;
2222	SERP_ARGS(node).symlinkarg.attributes.size = 0;
2223	SERP_ARGS(node).symlinkarg.attributes.atime.seconds = now.tv_sec;
2224	SERP_ARGS(node).symlinkarg.attributes.atime.useconds = now.tv_usec;
2225	SERP_ARGS(node).symlinkarg.attributes.mtime.seconds = now.tv_sec;
2226	SERP_ARGS(node).symlinkarg.attributes.mtime.useconds = now.tv_usec;
2227
2228	if ( nfscall( node->nfs->server,
2229	NFSPROC_SYMLINK,
2230	(xdrproc_t)xdr_symlinkargs, &SERP_FILE(node),
2231	(xdrproc_t)xdr_nfsstat, &status)
2232	\|\| (NFS_OK != (errno = status)) ) {
2233	#if DEBUG & DEBUG_SYSCALLS
2234	perror("nfs_symlink");
2235	#endif
2236	return -1;
2237	}
2238
2239	return 0;
2240	}
2241
2242	static int nfs_do_readlink(
2243	rtems_filesystem_location_info_t loc, / IN */
2244	strbuf psbuf / IN/OUT */
2245	)
2246	{
2247	NfsNode node = loc->node_access;
2248	Nfs nfs = node->nfs;
2249	readlinkres_strbuf rr;
2250	int wasAlloced;
2251	int rval;
2252
2253	rr.strbuf = *psbuf;
2254
2255	wasAlloced = (0 == psbuf->buf);
2256
2257	if ( (rval = nfscall(nfs->server,
2258	NFSPROC_READLINK,
2259	(xdrproc_t)xdr_nfs_fh, &SERP_FILE(node),
2260	(xdrproc_t)xdr_readlinkres_strbuf, &rr)) ) {
2261	if (wasAlloced)
2262	xdr_free( (xdrproc_t)xdr_strbuf, (caddr_t)&rr.strbuf );
2263	}
2264
2265
2266	if (NFS_OK != rr.status) {
2267	if (wasAlloced)
2268	xdr_free( (xdrproc_t)xdr_strbuf, (caddr_t)&rr.strbuf );
2269	rtems_set_errno_and_return_minus_one(rr.status);
2270	}
2271
2272	*psbuf = rr.strbuf;
2273
2274	return 0;
2275	}
2276
2277	static int nfs_readlink(
2278	rtems_filesystem_location_info_t loc, / IN */
2279	char buf, / OUT */
2280	size_t len
2281	)
2282	{
2283	strbuf sbuf;
2284	sbuf.buf = buf;
2285	sbuf.max = len;
2286
2287	return nfs_do_readlink(loc, &sbuf);
2288	}
2289
2290	/* The semantics of this routine are:
2291	*
2292	* The caller submits a valid pathloc, i.e. it has
2293	* an NfsNode attached to node_access.
2294	* On return, pathloc points to the target node which
2295	* may or may not be an NFS node.
2296	* Hence, the original NFS node is released in either
2297	* case:
2298	* - link evaluation fails; pathloc points to no valid node
2299	* - link evaluation success; pathloc points to a new valid
2300	* node. If it's an NFS node, a new NfsNode will be attached
2301	* to node_access...
2302	*/
2303
2304	#define LINKVAL_BUFLEN (MAXPATHLEN+1)
2305	#define RVAL_ERR_BUT_DONT_FREENODE (-1)
2306	#define RVAL_ERR_AND_DO_FREENODE ( 1)
2307	#define RVAL_OK ( 0)
2308
2309	static int nfs_eval_link(
2310	rtems_filesystem_location_info_t pathloc, / IN/OUT */
2311	int flags /* IN */
2312	)
2313	{
2314	rtems_filesystem_node_types_t type;
2315	char *buf = malloc(LINKVAL_BUFLEN);
2316	int rval = RVAL_ERR_AND_DO_FREENODE;
2317
2318	if (!buf) {
2319	errno = ENOMEM;
2320	goto cleanup;
2321	}
2322
2323	/* in this loop, we must not use NFS specific ops as we might
2324	* step out of our FS during the process...
2325	* This algorithm should actually be performed by the
2326	* generic's evaluate_path routine :-(
2327	*
2328	* Unfortunately, there is no way of finding the
2329	* directory node who contains 'pathloc', however :-(
2330	*/
2331	do {
2332	/* assume the generics have verified 'pathloc' to be
2333	* a link...
2334	*/
2335	if ( !pathloc->ops->readlink_h ) {
2336	errno = ENOTSUP;
2337	goto cleanup;
2338	}
2339
2340	if ( pathloc->ops->readlink_h(pathloc, buf, LINKVAL_BUFLEN) ) {
2341	goto cleanup;
2342	}
2343
2344	#if DEBUG & DEBUG_EVALPATH
2345	fprintf(stderr, "link value is '%s'\n", buf);
2346	#endif
2347
2348	/* is the link value an absolute path ? */
2349	if ( DELIM != *buf ) {
2350	/* NO; a relative path */
2351
2352	/* we must backup to the link's directory - we
2353	* know only how to do that for NFS, however.
2354	* In this special case, we can avoid recursion.
2355	* Otherwise (i.e. if the link is on another FS),
2356	* we must step into its eval_link_h().
2357	*/
2358	if (locIsNfs(pathloc)) {
2359	NfsNode node = pathloc->node_access;
2360	int err;
2361
2362	memcpy( &SERP_FILE(node),
2363	&node->args.dir,
2364	sizeof(node->args.dir) );
2365
2366	if (updateAttr(node, 1 /* force */))
2367	goto cleanup;
2368
2369	if (SERP_ATTR(node).type != NFDIR) {
2370	errno = ENOTDIR;
2371	goto cleanup;
2372	}
2373
2374	pathloc->handlers = &nfs_dir_file_handlers;
2375
2376	err = nfs_evalpath(buf, strlen(buf), flags, pathloc);
2377
2378	/* according to its semantics,
2379	* nfs_evalpath cloned the node attached
2380	* to pathloc. Hence we have to
2381	* release the old one (referring to
2382	* the link; the new clone has been
2383	* updated and refers to the link _value_).
2384	*/
2385	nfsNodeDestroy(node);
2386
2387	if (err) {
2388	/* nfs_evalpath has set errno;
2389	* pathloc->node_access has no
2390	* valid node attached in this case
2391	*/
2392	rval = RVAL_ERR_BUT_DONT_FREENODE;
2393	goto cleanup;
2394	}
2395
2396	} else {
2397	if ( ! pathloc->ops->eval_link_h ) {
2398	errno = ENOTSUP;
2399	goto cleanup;
2400	}
2401	if (!pathloc->ops->eval_link_h(pathloc, flags)) {
2402	/* FS is responsible for freeing its pathloc->node_access
2403	* if necessary
2404	*/
2405	rval = RVAL_ERR_BUT_DONT_FREENODE;
2406	goto cleanup;
2407	}
2408	}
2409	} else {
2410	/* link points to an absolute path '/xxx' */
2411
2412	/* release this node; filesystem_evaluate_path() will
2413	* lookup a new one.
2414	*/
2415	rtems_filesystem_freenode(pathloc);
2416
2417	if (rtems_filesystem_evaluate_path(buf, strlen(buf), flags, pathloc, 1)) {
2418	/* If evalpath fails then there is no valid node
2419	* attached to pathloc; hence we must not attempt
2420	* to free the node
2421	*/
2422	rval = RVAL_ERR_BUT_DONT_FREENODE;
2423	goto cleanup;
2424	}
2425	}
2426
2427	if ( !pathloc->ops->node_type_h ) {
2428	errno = ENOTSUP;
2429	goto cleanup;
2430	}
2431
2432	type = pathloc->ops->node_type_h(pathloc);
2433
2434
2435	/* I dont know what to do about hard links */
2436	} while ( RTEMS_FILESYSTEM_SYM_LINK == type );
2437
2438	rval = RVAL_OK;
2439
2440	cleanup:
2441
2442	free(buf);
2443
2444	if (RVAL_ERR_AND_DO_FREENODE == rval) {
2445	rtems_filesystem_freenode(pathloc);
2446	return -1;
2447	}
2448
2449	return rval;
2450	}
2451
2452
2453	struct _rtems_filesystem_operations_table nfs_fs_ops = {
2454	nfs_evalpath, /* MANDATORY */
2455	nfs_evalformake, /* MANDATORY; may set errno=ENOSYS and return -1 */
2456	nfs_link, /* OPTIONAL; may be NULL */
2457	nfs_unlink, /* OPTIONAL; may be NULL */
2458	nfs_node_type, /* OPTIONAL; may be NULL; BUG in mount - no test!! */
2459	nfs_mknod, /* OPTIONAL; may be NULL */
2460	nfs_chown, /* OPTIONAL; may be NULL */
2461	nfs_freenode, /* OPTIONAL; may be NULL; (release node_access) */
2462	nfs_mount, /* OPTIONAL; may be NULL */
2463	nfs_fsmount_me, /* OPTIONAL; may be NULL -- but this makes NO SENSE */
2464	nfs_unmount, /* OPTIONAL; may be NULL */
2465	nfs_fsunmount_me, /* OPTIONAL; may be NULL */
2466	nfs_utime, /* OPTIONAL; may be NULL */
2467	nfs_eval_link, /* OPTIONAL; may be NULL */
2468	nfs_symlink, /* OPTIONAL; may be NULL */
2469	nfs_readlink, /* OPTIONAL; may be NULL */
2470	NULL /* OPTIONAL; may be NULL */
2471	};
2472
2473	/*****************************************
2474	File Handlers
2475
2476	NOTE: the FS generics expect a FS'
2477	evalpath_h() to switch the
2478	pathloc->handlers according
2479	to the pathloc/node's file
2480	type.
2481	We currently have 'file' and
2482	'directory' handlers and very
2483	few 'symlink' handlers.
2484
2485	The handlers for each type are
2486	implemented or #defined ZERO
2487	in a 'nfs_file_xxx',
2488	'nfs_dir_xxx', 'nfs_link_xxx'
2489	sequence below this point.
2490
2491	In some cases, a common handler,
2492	can be used for all file types.
2493	It is then simply called
2494	'nfs_xxx'.
2495	*****************************************/
2496
2497
2498	#if 0
2499	/* from rtems/libio.h for convenience */
2500	struct rtems_libio_tt {
2501	rtems_driver_name_t *driver;
2502	off_t size; /* size of file */
2503	off_t offset; /* current offset into file */
2504	uint32_t flags;
2505	rtems_filesystem_location_info_t pathinfo;
2506	Objects_Id sem;
2507	uint32_t data0; /* private to "driver" */
2508	void data1; / ... */
2509	void file_info; / used by file handlers */
2510	rtems_filesystem_file_handlers_r handlers; / type specific handlers */
2511	};
2512	#endif
2513
2514	/* stateless NFS protocol makes this trivial */
2515	static int nfs_file_open(
2516	rtems_libio_t *iop,
2517	const char *pathname,
2518	uint32_t flag,
2519	uint32_t mode
2520	)
2521	{
2522	iop->file_info = 0;
2523	return 0;
2524	}
2525
2526	/* reading directories is not stateless; we must
2527	* remember the last 'read' position, i.e.
2528	* the server 'cookie'. We do manage this information
2529	* attached to the iop->file_info.
2530	*/
2531	static int nfs_dir_open(
2532	rtems_libio_t *iop,
2533	const char *pathname,
2534	uint32_t flag,
2535	uint32_t mode
2536	)
2537	{
2538	NfsNode node = iop->pathinfo.node_access;
2539	DirInfo di;
2540
2541	/* create a readdirargs object and copy the file handle;
2542	* attach to the file_info.
2543	*/
2544
2545	di = (DirInfo) malloc(sizeof(*di));
2546	iop->file_info = di;
2547
2548	if ( !di ) {
2549	errno = ENOMEM;
2550	return -1;
2551	}
2552
2553	memcpy( &di->readdirargs.dir,
2554	&SERP_FILE(node),
2555	sizeof(di->readdirargs.dir) );
2556
2557	/* rewind cookie */
2558	memset( &di->readdirargs.cookie,
2559	0,
2560	sizeof(di->readdirargs.cookie) );
2561
2562	di->eofreached = FALSE;
2563
2564	return 0;
2565	}
2566
2567	#define nfs_link_open 0
2568
2569	static int nfs_file_close(
2570	rtems_libio_t *iop
2571	)
2572	{
2573	return 0;
2574	}
2575
2576	static int nfs_dir_close(
2577	rtems_libio_t *iop
2578	)
2579	{
2580	free(iop->file_info);
2581	iop->file_info = 0;
2582	return 0;
2583	}
2584
2585	#define nfs_link_close 0
2586
2587	static ssize_t nfs_file_read(
2588	rtems_libio_t *iop,
2589	void *buffer,
2590	size_t count
2591	)
2592	{
2593	readres rr;
2594	NfsNode node = iop->pathinfo.node_access;
2595	Nfs nfs = node->nfs;
2596
2597	if (count > NFS_MAXDATA)
2598	count = NFS_MAXDATA;
2599
2600	SERP_ARGS(node).readarg.offset = iop->offset;
2601	SERP_ARGS(node).readarg.count = count;
2602	SERP_ARGS(node).readarg.totalcount = UINT32_C(0xdeadbeef);
2603
2604	rr.readres_u.reply.data.data_val = buffer;
2605
2606	if ( nfscall( nfs->server,
2607	NFSPROC_READ,
2608	(xdrproc_t)xdr_readargs, &SERP_FILE(node),
2609	(xdrproc_t)xdr_readres, &rr) ) {
2610	return -1;
2611	}
2612
2613
2614	if (NFS_OK != rr.status) {
2615	rtems_set_errno_and_return_minus_one(rr.status);
2616	}
2617
2618	#if DEBUG & DEBUG_SYSCALLS
2619	fprintf(stderr,
2620	"Read %i (asked for %i) bytes from offset %i to 0x%08x\n",
2621	rr.readres_u.reply.data.data_len,
2622	count,
2623	iop->offset,
2624	rr.readres_u.reply.data.data_val);
2625	#endif
2626
2627
2628	return rr.readres_u.reply.data.data_len;
2629	}
2630
2631	/* this is called by readdir() / getdents() */
2632	static ssize_t nfs_dir_read(
2633	rtems_libio_t *iop,
2634	void *buffer,
2635	size_t count
2636	)
2637	{
2638	DirInfo di = iop->file_info;
2639	RpcUdpServer server = ((Nfs)iop->pathinfo.mt_entry->fs_info)->server;
2640
2641	if ( di->eofreached )
2642	return 0;
2643
2644	di->ptr = di->buf = buffer;
2645
2646	/* align + round down the buffer */
2647	count &= ~ (DIRENT_HEADER_SIZE - 1);
2648	di->len = count;
2649
2650	#if 0
2651	/* now estimate the number of entries we should ask for */
2652	count /= DIRENT_HEADER_SIZE + CONFIG_AVG_NAMLEN;
2653
2654	/* estimate the encoded size that might take up */
2655	count *= dirres_entry_size + CONFIG_AVG_NAMLEN;
2656	#else
2657	/* integer arithmetics are better done the other way round */
2658	count *= dirres_entry_size + CONFIG_AVG_NAMLEN;
2659	count /= DIRENT_HEADER_SIZE + CONFIG_AVG_NAMLEN;
2660	#endif
2661
2662	if (count > NFS_MAXDATA)
2663	count = NFS_MAXDATA;
2664
2665	di->readdirargs.count = count;
2666
2667	#if DEBUG & DEBUG_READDIR
2668	fprintf(stderr,
2669	"Readdir: asking for %i XDR bytes, buffer is %i\n",
2670	count, di->len);
2671	#endif
2672
2673	if ( nfscall(
2674	server,
2675	NFSPROC_READDIR,
2676	(xdrproc_t)xdr_readdirargs, &di->readdirargs,
2677	(xdrproc_t)xdr_dir_info, di) ) {
2678	return -1;
2679	}
2680
2681
2682	if (NFS_OK != di->status) {
2683	rtems_set_errno_and_return_minus_one(di->status);
2684	}
2685
2686	return (char)di->ptr - (char)buffer;
2687	}
2688
2689	#define nfs_link_read 0
2690
2691	static ssize_t nfs_file_write(
2692	rtems_libio_t *iop,
2693	const void *buffer,
2694	size_t count
2695	)
2696	{
2697	NfsNode node = iop->pathinfo.node_access;
2698	Nfs nfs = node->nfs;
2699	int e;
2700
2701	if (count > NFS_MAXDATA)
2702	count = NFS_MAXDATA;
2703
2704
2705	SERP_ARGS(node).writearg.beginoffset = UINT32_C(0xdeadbeef);
2706	if ( LIBIO_FLAGS_APPEND & iop->flags ) {
2707	if ( updateAttr(node, 0) ) {
2708	return -1;
2709	}
2710	SERP_ARGS(node).writearg.offset = SERP_ATTR(node).size;
2711	} else {
2712	SERP_ARGS(node).writearg.offset = iop->offset;
2713	}
2714	SERP_ARGS(node).writearg.totalcount = UINT32_C(0xdeadbeef);
2715	SERP_ARGS(node).writearg.data.data_len = count;
2716	SERP_ARGS(node).writearg.data.data_val = (void*)buffer;
2717
2718	/* write XDR buffer size will be chosen by nfscall based
2719	* on the PROC specifier
2720	*/
2721
2722	if ( nfscall( nfs->server,
2723	NFSPROC_WRITE,
2724	(xdrproc_t)xdr_writeargs, &SERP_FILE(node),
2725	(xdrproc_t)xdr_attrstat, &node->serporid) ) {
2726	return -1;
2727	}
2728
2729
2730	if (NFS_OK != (e=node->serporid.status) ) {
2731	/* try at least to recover the current attributes */
2732	updateAttr(node, 1 /* force */);
2733	rtems_set_errno_and_return_minus_one(e);
2734	}
2735
2736	node->age = nowSeconds();
2737
2738	return count;
2739	}
2740
2741	#define nfs_dir_write 0
2742	#define nfs_link_write 0
2743
2744	/* IOCTL is unneeded/unsupported */
2745	#ifdef DECLARE_BODY
2746	static int nfs_file_ioctl(
2747	rtems_libio_t *iop,
2748	uint32_t command,
2749	void *buffer
2750	)DECLARE_BODY
2751	#else
2752	#define nfs_file_ioctl 0
2753	#define nfs_dir_ioctl 0
2754	#define nfs_link_ioctl 0
2755	#endif
2756
2757	static rtems_off64_t nfs_file_lseek(
2758	rtems_libio_t *iop,
2759	rtems_off64_t length,
2760	int whence
2761	)
2762	{
2763	#if DEBUG & DEBUG_SYSCALLS
2764	fprintf(stderr,
2765	"lseek to %i (length %i, whence %i)\n",
2766	iop->offset,
2767	length,
2768	whence);
2769	#endif
2770	if ( SEEK_END == whence ) {
2771	/* rtems (4.6.2) libcsupport code 'lseek' uses iop->size to
2772	* compute the offset. We don't want to track the file size
2773	* by updating 'iop->size' constantly.
2774	* Since lseek is the only place using iop->size, we work
2775	* around this by tweaking the offset here...
2776	*/
2777	NfsNode node = iop->pathinfo.node_access;
2778	fattr *fa = &SERP_ATTR(node);
2779
2780	if (updateAttr(node, 0 /* only if old */)) {
2781	return -1;
2782	}
2783	iop->offset = fa->size;
2784	}
2785
2786	/* this is particularly easy :-) */
2787	return iop->offset;
2788	}
2789
2790	static rtems_off64_t nfs_dir_lseek(
2791	rtems_libio_t *iop,
2792	rtems_off64_t length,
2793	int whence
2794	)
2795	{
2796	DirInfo di = iop->file_info;
2797
2798	/* we don't support anything other than
2799	* rewinding
2800	*/
2801	if (SEEK_SET != whence \|\| 0 != length) {
2802	errno = ENOTSUP;
2803	return -1;
2804	}
2805
2806	/* rewind cookie */
2807	memset( &di->readdirargs.cookie,
2808	0,
2809	sizeof(di->readdirargs.cookie) );
2810
2811	di->eofreached = FALSE;
2812
2813	return iop->offset;
2814	}
2815
2816	#define nfs_link_lseek 0
2817
2818	#if 0 /* structure types for reference */
2819	struct fattr {
2820	ftype type;
2821	u_int mode;
2822	u_int nlink;
2823	u_int uid;
2824	u_int gid;
2825	u_int size;
2826	u_int blocksize;
2827	u_int rdev;
2828	u_int blocks;
2829	u_int fsid;
2830	u_int fileid;
2831	nfstime atime;
2832	nfstime mtime;
2833	nfstime ctime;
2834	};
2835
2836	struct stat
2837	{
2838	dev_t st_dev;
2839	ino_t st_ino;
2840	mode_t st_mode;
2841	nlink_t st_nlink;
2842	uid_t st_uid;
2843	gid_t st_gid;
2844	dev_t st_rdev;
2845	rtems_off64_t st_size;
2846	/* SysV/sco doesn't have the rest... But Solaris, eabi does. */
2847	#if defined(__svr4__) && !defined(__PPC__) && !defined(__sun__)
2848	time_t st_atime;
2849	time_t st_mtime;
2850	time_t st_ctime;
2851	#else
2852	time_t st_atime;
2853	long st_spare1;
2854	time_t st_mtime;
2855	long st_spare2;
2856	time_t st_ctime;
2857	long st_spare3;
2858	long st_blksize;
2859	long st_blocks;
2860	long st_spare4[2];
2861	#endif
2862	};
2863	#endif
2864
2865	/* common for file/dir/link */
2866	static int nfs_fstat(
2867	rtems_filesystem_location_info_t *loc,
2868	struct stat *buf
2869	)
2870	{
2871	NfsNode node = loc->node_access;
2872	fattr *fa = &SERP_ATTR(node);
2873
2874	if (updateAttr(node, 0 /* only if old */)) {
2875	return -1;
2876	}
2877
2878	/* done by caller
2879	memset(buf, 0, sizeof(*buf));
2880	*/
2881
2882	/* translate */
2883
2884	/* one of the branches hopefully is optimized away */
2885	if (sizeof(ino_t) < sizeof(u_int)) {
2886	buf->st_dev = NFS_MAKE_DEV_T_INO_HACK((NfsNode)loc->node_access);
2887	} else {
2888	buf->st_dev = NFS_MAKE_DEV_T((NfsNode)loc->node_access);
2889	}
2890	buf->st_mode = fa->mode;
2891	buf->st_nlink = fa->nlink;
2892	buf->st_uid = fa->uid;
2893	buf->st_gid = fa->gid;
2894	buf->st_size = fa->size;
2895	/* Set to "preferred size" of this NFS client implementation */
2896	buf->st_blksize = nfsStBlksize ? nfsStBlksize : fa->blocksize;
2897	buf->st_rdev = fa->rdev;
2898	buf->st_blocks = fa->blocks;
2899	buf->st_ino = fa->fileid;
2900	buf->st_atime = fa->atime.seconds;
2901	buf->st_mtime = fa->mtime.seconds;
2902	buf->st_ctime = fa->ctime.seconds;
2903
2904	#if 0 /* NFS should return the modes */
2905	switch(fa->type) {
2906	default:
2907	case NFNON:
2908	case NFBAD:
2909	break;
2910
2911	case NFSOCK: buf->st_mode \|= S_IFSOCK; break;
2912	case NFFIFO: buf->st_mode \|= S_IFIFO; break;
2913	case NFREG : buf->st_mode \|= S_IFREG; break;
2914	case NFDIR : buf->st_mode \|= S_IFDIR; break;
2915	case NFBLK : buf->st_mode \|= S_IFBLK; break;
2916	case NFCHR : buf->st_mode \|= S_IFCHR; break;
2917	case NFLNK : buf->st_mode \|= S_IFLNK; break;
2918	}
2919	#endif
2920
2921	return 0;
2922	}
2923
2924	/* a helper which does the real work for
2925	* a couple of handlers (such as chmod,
2926	* ftruncate or utime)
2927	*/
2928	static int
2929	nfs_sattr(NfsNode node, sattr *arg, u_long mask)
2930	{
2931
2932	struct timeval now;
2933	nfstime nfsnow, t;
2934	int e;
2935	u_int mode;
2936
2937	if (updateAttr(node, 0 /* only if old */))
2938	return -1;
2939
2940	rtems_clock_get_tod_timeval(&now);
2941
2942	/* TODO: add rtems EPOCH - UNIX EPOCH seconds */
2943	nfsnow.seconds = now.tv_sec;
2944	nfsnow.useconds = now.tv_usec;
2945
2946	/* merge permission bits into existing type bits */
2947	mode = SERP_ATTR(node).mode;
2948	if (mask & SATTR_MODE) {
2949	mode &= S_IFMT;
2950	mode \|= arg->mode & ~S_IFMT;
2951	} else {
2952	mode = -1;
2953	}
2954	SERP_ARGS(node).sattrarg.attributes.mode = mode;
2955
2956	SERP_ARGS(node).sattrarg.attributes.uid =
2957	(mask & SATTR_UID) ? arg->uid : -1;
2958
2959	SERP_ARGS(node).sattrarg.attributes.gid =
2960	(mask & SATTR_GID) ? arg->gid : -1;
2961
2962	SERP_ARGS(node).sattrarg.attributes.size =
2963	(mask & SATTR_SIZE) ? arg->size : -1;
2964
2965	if (mask & SATTR_ATIME)
2966	t = arg->atime;
2967	else if (mask & SATTR_TOUCHA)
2968	t = nfsnow;
2969	else
2970	t.seconds = t.useconds = -1;
2971	SERP_ARGS(node).sattrarg.attributes.atime = t;
2972
2973	if (mask & SATTR_ATIME)
2974	t = arg->mtime;
2975	else if (mask & SATTR_TOUCHA)
2976	t = nfsnow;
2977	else
2978	t.seconds = t.useconds = -1;
2979	SERP_ARGS(node).sattrarg.attributes.mtime = t;
2980
2981	node->serporid.status = NFS_OK;
2982
2983	if ( nfscall( node->nfs->server,
2984	NFSPROC_SETATTR,
2985	(xdrproc_t)xdr_sattrargs, &SERP_FILE(node),
2986	(xdrproc_t)xdr_attrstat, &node->serporid) ) {
2987	#if DEBUG & DEBUG_SYSCALLS
2988	fprintf(stderr,
2989	"nfs_sattr (mask 0x%08x): %s",
2990	mask,
2991	strerror(errno));
2992	#endif
2993	return -1;
2994	}
2995
2996	if (NFS_OK != (e=node->serporid.status) ) {
2997	#if DEBUG & DEBUG_SYSCALLS
2998	fprintf(stderr,"nfs_sattr: %s\n",strerror(e));
2999	#endif
3000	/* try at least to recover the current attributes */
3001	updateAttr(node, 1 /* force */);
3002	rtems_set_errno_and_return_minus_one(e);
3003	}
3004
3005	node->age = nowSeconds();
3006
3007	return 0;
3008	}
3009
3010
3011	/* common for file/dir/link */
3012	static int nfs_fchmod(
3013	rtems_filesystem_location_info_t *loc,
3014	mode_t mode
3015	)
3016	{
3017	sattr arg;
3018
3019	arg.mode = mode;
3020	return nfs_sattr(loc->node_access, &arg, SATTR_MODE);
3021
3022	}
3023
3024	/* just set the size attribute to 'length'
3025	* the server will take care of the rest :-)
3026	*/
3027	static int nfs_file_ftruncate(
3028	rtems_libio_t *iop,
3029	rtems_off64_t length
3030	)
3031	{
3032	sattr arg;
3033
3034	arg.size = length;
3035	/* must not modify any other attribute; if we are not the owner
3036	* of the file or directory but only have write access changing
3037	* any attribute besides 'size' will fail...
3038	*/
3039	return nfs_sattr(iop->pathinfo.node_access,
3040	&arg,
3041	SATTR_SIZE);
3042	}
3043
3044	#define nfs_dir_ftruncate 0
3045	#define nfs_link_ftruncate 0
3046
3047	/* not implemented */
3048	#ifdef DECLARE_BODY
3049	static int nfs_file_fpathconf(
3050	rtems_libio_t *iop,
3051	int name
3052	)DECLARE_BODY
3053	#else
3054	#define nfs_file_fpathconf 0
3055	#define nfs_dir_fpathconf 0
3056	#define nfs_link_fpathconf 0
3057	#endif
3058
3059	/* unused */
3060	#ifdef DECLARE_BODY
3061	static int nfs_file_fsync(
3062	rtems_libio_t *iop
3063	)DECLARE_BODY
3064	#else
3065	#define nfs_file_fsync 0
3066	#define nfs_dir_fsync 0
3067	#define nfs_link_fsync 0
3068	#endif
3069
3070	/* unused */
3071	#ifdef DECLARE_BODY
3072	static int nfs_file_fdatasync(
3073	rtems_libio_t *iop
3074	)DECLARE_BODY
3075	#else
3076	#define nfs_file_fdatasync 0
3077	#define nfs_dir_fdatasync 0
3078	#define nfs_link_fdatasync 0
3079	#endif
3080
3081	/* unused */
3082	#ifdef DECLARE_BODY
3083	static int nfs_file_fcntl(
3084	int cmd,
3085	rtems_libio_t *iop
3086	)DECLARE_BODY
3087	#else
3088	#define nfs_file_fcntl 0
3089	#define nfs_dir_fcntl 0
3090	#define nfs_link_fcntl 0
3091	#endif
3092
3093	/* files and symlinks are removed
3094	* by the common nfs_unlink() routine.
3095	* NFS has a different NFSPROC_RMDIR
3096	* call, though...
3097	*/
3098	static int nfs_dir_rmnod(
3099	rtems_filesystem_location_info_t parentpathloc, / IN */
3100	rtems_filesystem_location_info_t pathloc / IN */
3101	)
3102	{
3103	return nfs_do_unlink(parentpathloc, pathloc, NFSPROC_RMDIR);
3104	}
3105
3106	/* the file handlers table */
3107	static
3108	struct _rtems_filesystem_file_handlers_r nfs_file_file_handlers = {
3109	nfs_file_open, /* OPTIONAL; may be NULL */
3110	nfs_file_close, /* OPTIONAL; may be NULL */
3111	nfs_file_read, /* OPTIONAL; may be NULL */
3112	nfs_file_write, /* OPTIONAL; may be NULL */
3113	nfs_file_ioctl, /* OPTIONAL; may be NULL */
3114	nfs_file_lseek, /* OPTIONAL; may be NULL */
3115	nfs_fstat, /* OPTIONAL; may be NULL */
3116	nfs_fchmod, /* OPTIONAL; may be NULL */
3117	nfs_file_ftruncate, /* OPTIONAL; may be NULL */
3118	nfs_file_fpathconf, /* OPTIONAL; may be NULL - UNUSED */
3119	nfs_file_fsync, /* OPTIONAL; may be NULL */
3120	nfs_file_fdatasync, /* OPTIONAL; may be NULL */
3121	nfs_file_fcntl, /* OPTIONAL; may be NULL */
3122	nfs_unlink, /* OPTIONAL; may be NULL */
3123	};
3124
3125	/* the directory handlers table */
3126	static
3127	struct _rtems_filesystem_file_handlers_r nfs_dir_file_handlers = {
3128	nfs_dir_open, /* OPTIONAL; may be NULL */
3129	nfs_dir_close, /* OPTIONAL; may be NULL */
3130	nfs_dir_read, /* OPTIONAL; may be NULL */
3131	nfs_dir_write, /* OPTIONAL; may be NULL */
3132	nfs_dir_ioctl, /* OPTIONAL; may be NULL */
3133	nfs_dir_lseek, /* OPTIONAL; may be NULL */
3134	nfs_fstat, /* OPTIONAL; may be NULL */
3135	nfs_fchmod, /* OPTIONAL; may be NULL */
3136	nfs_dir_ftruncate, /* OPTIONAL; may be NULL */
3137	nfs_dir_fpathconf, /* OPTIONAL; may be NULL - UNUSED */
3138	nfs_dir_fsync, /* OPTIONAL; may be NULL */
3139	nfs_dir_fdatasync, /* OPTIONAL; may be NULL */
3140	nfs_dir_fcntl, /* OPTIONAL; may be NULL */
3141	nfs_dir_rmnod, /* OPTIONAL; may be NULL */
3142	};
3143
3144	/* the link handlers table */
3145	static
3146	struct _rtems_filesystem_file_handlers_r nfs_link_file_handlers = {
3147	nfs_link_open, /* OPTIONAL; may be NULL */
3148	nfs_link_close, /* OPTIONAL; may be NULL */
3149	nfs_link_read, /* OPTIONAL; may be NULL */
3150	nfs_link_write, /* OPTIONAL; may be NULL */
3151	nfs_link_ioctl, /* OPTIONAL; may be NULL */
3152	nfs_link_lseek, /* OPTIONAL; may be NULL */
3153	nfs_fstat, /* OPTIONAL; may be NULL */
3154	nfs_fchmod, /* OPTIONAL; may be NULL */
3155	nfs_link_ftruncate, /* OPTIONAL; may be NULL */
3156	nfs_link_fpathconf, /* OPTIONAL; may be NULL - UNUSED */
3157	nfs_link_fsync, /* OPTIONAL; may be NULL */
3158	nfs_link_fdatasync, /* OPTIONAL; may be NULL */
3159	nfs_link_fcntl, /* OPTIONAL; may be NULL */
3160	nfs_unlink, /* OPTIONAL; may be NULL */
3161	};
3162
3163	/* we need a dummy driver entry table to get a
3164	* major number from the system
3165	*/
3166	static
3167	rtems_device_driver nfs_initialize(
3168	rtems_device_major_number major,
3169	rtems_device_minor_number minor,
3170	void *arg
3171	)
3172	{
3173	/* we don't really use this routine because
3174	* we cannot supply an argument (contrary
3175	* to what the 'arg' parameter suggests - it
3176	* is always set to 0 by the generics :-()
3177	* and because we don't want the user to
3178	* have to deal with the major number (which
3179	* OTOH is something WE are interested in. The
3180	* only reason for using this API was getting
3181	* a major number, after all).
3182	*
3183	* Something must be present, however, to
3184	* reserve a slot in the driver table.
3185	*/
3186	return RTEMS_SUCCESSFUL;
3187	}
3188
3189	static rtems_driver_address_table drvNfs = {
3190	nfs_initialize,
3191	0, /* open */
3192	0, /* close */
3193	0, /* read */
3194	0, /* write */
3195	0 /* control */
3196	};
3197
3198	/* Dump a list of the currently mounted NFS to a file */
3199	int
3200	nfsMountsShow(FILE *f)
3201	{
3202	char *mntpt = 0;
3203	Nfs nfs;
3204
3205	if (!f)
3206	f = stdout;
3207
3208	if ( !(mntpt=malloc(MAXPATHLEN)) ) {
3209	fprintf(stderr,"nfsMountsShow(): no memory\n");
3210	return -1;
3211	}
3212
3213	fprintf(f,"Currently Mounted NFS:\n");
3214
3215	LOCK(nfsGlob.llock);
3216
3217	for (nfs = nfsGlob.mounted_fs; nfs; nfs=nfs->next) {
3218	fprintf(f,"%s on ", nfs->mt_entry->dev);
3219	if (rtems_filesystem_resolve_location(mntpt, MAXPATHLEN, &nfs->mt_entry->mt_fs_root))
3220	fprintf(f,"<UNABLE TO LOOKUP MOUNTPOINT>\n");
3221	else
3222	fprintf(f,"%s\n",mntpt);
3223	}
3224
3225	UNLOCK(nfsGlob.llock);
3226
3227	free(mntpt);
3228	return 0;
3229	}
3230
3231	/* convenience wrapper
3232	*
3233	* NOTE: this routine calls NON-REENTRANT
3234	* gethostbyname() if the host is
3235	* not in 'dot' notation.
3236	*/
3237	int
3238	nfsMount(char uidhost, char path, char *mntpoint)
3239	{
3240	rtems_filesystem_mount_table_entry_t *mtab;
3241	struct stat st;
3242	int devl;
3243	char *host;
3244	int rval = -1;
3245	char *dev = 0;
3246
3247	if (!uidhost \|\| !path \|\| !mntpoint) {
3248	fprintf(stderr,"usage: nfsMount(""[uid.gid@]host"",""path"",""mountpoint"")\n");
3249	nfsMountsShow(stderr);
3250	return -1;
3251	}
3252
3253	if ( !(dev = malloc((devl=strlen(uidhost) + 20 + strlen(path)+1))) ) {
3254	fprintf(stderr,"nfsMount: out of memory\n");
3255	return -1;
3256	}
3257
3258	/* Try to create the mount point if nonexistent */
3259	if (stat(mntpoint, &st)) {
3260	if (ENOENT != errno) {
3261	perror("nfsMount trying to create mount point - stat failed");
3262	goto cleanup;
3263	} else if (mkdir(mntpoint,0777)) {
3264	perror("nfsMount trying to create mount point");
3265	goto cleanup;
3266	}
3267	}
3268
3269	if ( !(host=strchr(uidhost,UIDSEP)) ) {
3270	host = uidhost;
3271	} else {
3272	host++;
3273	}
3274
3275	if (isdigit((unsigned char)*host)) {
3276	/* avoid using gethostbyname */
3277	sprintf(dev,"%s:%s",uidhost,path);
3278	} else {
3279	struct hostent *h;
3280
3281	/* copy the uid part (hostname will be
3282	* overwritten)
3283	*/
3284	strcpy(dev, uidhost);
3285
3286	/* NOTE NOTE NOTE: gethostbyname is NOT
3287	* thread safe. This is UGLY
3288	*/
3289
3290	/* BEGIN OF NON-THREAD SAFE REGION */
3291
3292	h = gethostbyname(host);
3293
3294	if ( !h \|\|
3295	!inet_ntop( AF_INET,
3296	(struct in_addr*)h->h_addr_list[0],
3297	dev + (host - uidhost),
3298	devl - (host - uidhost) )
3299	) {
3300	fprintf(stderr,"nfsMount: host '%s' not found\n",host);
3301	goto cleanup;
3302	}
3303
3304	/* END OF NON-THREAD SAFE REGION */
3305
3306	/* append ':<path>' */
3307	strcat(dev,":");
3308	strcat(dev,path);
3309	}
3310
3311	printf("Trying to mount %s on %s\n",dev,mntpoint);
3312
3313	if (mount(&mtab,
3314	&nfs_fs_ops,
3315	RTEMS_FILESYSTEM_READ_WRITE,
3316	dev,
3317	mntpoint)) {
3318	perror("nfsMount - mount");
3319	goto cleanup;
3320	}
3321
3322	rval = 0;
3323
3324	cleanup:
3325	free(dev);
3326	return rval;
3327	}
3328
3329	/* HERE COMES A REALLY UGLY HACK */
3330
3331	/* This is stupid; it is _very_ hard to find the path
3332	* leading to a rtems_filesystem_location_info_t node :-(
3333	* The only easy way is making the location the current
3334	* directory and issue a getcwd().
3335	* However, since we don't want to tamper with the
3336	* current directory, we must create a separate
3337	* task to do the job for us - sigh.
3338	*/
3339
3340	typedef struct ResolvePathArgRec_ {
3341	rtems_filesystem_location_info_t loc; / IN: location to resolve */
3342	char buf; / IN/OUT: buffer where to put the path */
3343	int len; /* IN: buffer length */
3344	rtems_id sync; /* IN: synchronization */
3345	rtems_status_code status; /* OUT: result */
3346	} ResolvePathArgRec, *ResolvePathArg;
3347
3348	static void
3349	resolve_path(rtems_task_argument arg)
3350	{
3351	ResolvePathArg rpa = (ResolvePathArg)arg;
3352	rtems_filesystem_location_info_t old;
3353
3354	/* IMPORTANT: let the helper task have its own libio environment (i.e. cwd) */
3355	if (RTEMS_SUCCESSFUL == (rpa->status = rtems_libio_set_private_env())) {
3356
3357	old = rtems_filesystem_current;
3358
3359	rtems_filesystem_current = *(rpa->loc);
3360
3361	if ( !getcwd(rpa->buf, rpa->len) )
3362	rpa->status = RTEMS_UNSATISFIED;
3363
3364	/* must restore the cwd because 'freenode' will be called on it */
3365	rtems_filesystem_current = old;
3366	}
3367	rtems_semaphore_release(rpa->sync);
3368	rtems_task_delete(RTEMS_SELF);
3369	}
3370
3371
3372	/* a utility routine to find the path leading to a
3373	* rtems_filesystem_location_info_t node
3374	*
3375	* INPUT: 'loc' and a buffer 'buf' (length 'len') to hold the
3376	* path.
3377	* OUTPUT: path copied into 'buf'
3378	*
3379	* RETURNS: 0 on success, RTEMS error code on error.
3380	*/
3381	rtems_status_code
3382	rtems_filesystem_resolve_location(char buf, int len, rtems_filesystem_location_info_t loc)
3383	{
3384	ResolvePathArgRec arg;
3385	rtems_id tid = 0;
3386	rtems_task_priority pri;
3387	rtems_status_code status;
3388
3389	arg.loc = loc;
3390	arg.buf = buf;
3391	arg.len = len;
3392	arg.sync = 0;
3393
3394	status = rtems_semaphore_create(
3395	rtems_build_name('r','e','s','s'),
3396	0,
3397	RTEMS_SIMPLE_BINARY_SEMAPHORE,
3398	0,
3399	&arg.sync);
3400
3401	if (RTEMS_SUCCESSFUL != status)
3402	goto cleanup;
3403
3404	rtems_task_set_priority(RTEMS_SELF, RTEMS_CURRENT_PRIORITY, &pri);
3405
3406	status = rtems_task_create(
3407	rtems_build_name('r','e','s','s'),
3408	pri,
3409	RTEMS_MINIMUM_STACK_SIZE + 50000,
3410	RTEMS_DEFAULT_MODES,
3411	RTEMS_DEFAULT_ATTRIBUTES,
3412	&tid);
3413
3414	if (RTEMS_SUCCESSFUL != status)
3415	goto cleanup;
3416
3417	status = rtems_task_start(tid, resolve_path, (rtems_task_argument)&arg);
3418
3419	if (RTEMS_SUCCESSFUL != status) {
3420	rtems_task_delete(tid);
3421	goto cleanup;
3422	}
3423
3424
3425	/* synchronize with the helper task */
3426	rtems_semaphore_obtain(arg.sync, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
3427
3428	status = arg.status;
3429
3430	cleanup:
3431	if (arg.sync)
3432	rtems_semaphore_delete(arg.sync);
3433
3434	return status;
3435	}
3436
3437	int
3438	nfsSetTimeout(uint32_t timeout_ms)
3439	{
3440	rtems_interrupt_level k;
3441	uint32_t s,us;
3442
3443	if ( timeout_ms > 100000 ) {
3444	/* out of range */
3445	return -1;
3446	}
3447
3448	s = timeout_ms/1000;
3449	us = (timeout_ms % 1000) * 1000;
3450
3451	rtems_interrupt_disable(k);
3452	_nfscalltimeout.tv_sec = s;
3453	_nfscalltimeout.tv_usec = us;
3454	rtems_interrupt_enable(k);
3455
3456	return 0;
3457	}
3458
3459	uint32_t
3460	nfsGetTimeout( void )
3461	{
3462	rtems_interrupt_level k;
3463	uint32_t s,us;
3464	rtems_interrupt_disable(k);
3465	s = _nfscalltimeout.tv_sec;
3466	us = _nfscalltimeout.tv_usec;
3467	rtems_interrupt_enable(k);
3468	return s*1000 + us/1000;
3469	}

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