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source: rtems/cpukit/libfs/src/nfsclient/src/nfs.c @ ea90df23

4.104.114.95

Last change on this file since ea90df23 was ea90df23, checked in by Chris Johns <chrisj@…>, on 04/03/08 at 03:13:24

2008-04-03 Chris Johns <chrisj@…>

libfs/src/nfsclient/src/librtemsNfs.h, libfs/src/nfsclient/src/nfs.c: Remove CEXP references. CEXP is external to RTEMS and even if in the cpukit it should not cross reference in this way.
libmisc/shell/shell_getchar.c: New. Taken from the monitor.
libmisc/Makefile.am: Add shell_getchar.c and clean up a little in the shell area.
libmisc/shell/shell.c, libmisc/shell/shell.h: Add line editting support.

Property mode set to 100644

File size: 80.0 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	(((node)->nfs->id)<<16) \| (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	(((node)->nfs->id)<<16) \| (SERP_ATTR((node)).fsid & ((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	u_int offset;
388	u_int count;
389	u_int totalcount;
390	} readarg;
391	struct {
392	u_int beginoffset;
393	u_int offset;
394	u_int totalcount;
395	struct {
396	u_int 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	u_int 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	register uint32_t rval;
484	#ifndef READ_LONG_IS_ATOMIC
485	rtems_interrupt_level l;
486
487	rtems_interrupt_disable(level);
488	#endif
489
490	rval = _TOD_Seconds_since_epoch;
491
492	#ifndef READ_LONG_IS_ATOMIC
493	rtems_interrupt_enable(level);
494	#endif
495	return rval;
496	}
497
498
499	/* Per mounted FS structure */
500	typedef struct NfsRec_ {
501	/* the NFS server we're talking to.
502	*/
503	RpcUdpServer server;
504	/* statistics; how many NfsNodes are
505	* currently alive.
506	*/
507	volatile int nodesInUse;
508	#if DEBUG & DEBUG_COUNT_NODES
509	/* statistics; how many 'NfsNode.str'
510	* strings are currently allocated.
511	*/
512	volatile int stringsInUse;
513	#endif
514	/* A small number who uniquely
515	* identifies a mounted NFS within
516	* this driver (i.e. this NfsRec).
517	* Each time a NFS is mounted, the
518	* global ID counter is incremented
519	* and its value is assigned to the
520	* newly created NfsRec.
521	*/
522	u_short id;
523	/* Our RTEMS filesystem mt_entry
524	*/
525	rtems_filesystem_mount_table_entry_t *mt_entry;
526	/* Next NfsRec on a linked list who
527	* is anchored at nfsGlob
528	*/
529	struct NfsRec_ *next;
530	/* Who we pretend we are
531	*/
532	u_long uid,gid;
533	} NfsRec, *Nfs;
534
535	typedef struct NfsNodeRec_ {
536	/* This holds this node's attributes
537	* (stats) and its nfs filehandle.
538	* It also contains room for nfs rpc
539	* arguments.
540	*/
541	serporid serporid;
542	/* The arguments we used when doing
543	* the 'lookup' call for this node.
544	* We need this information (especially
545	* the directory FH) for performing
546	* certain operations on this
547	* node (in particular: for unlinking
548	* it from a parent directory)
549	*/
550	diropargs args;
551	/* FS this node belongs to
552	*/
553	Nfs nfs;
554	/* A buffer for the string the
555	* args.name points to.
556	* We need this because args.name might
557	* temporarily point to strings on the
558	* stack. Duplicates are allocated from
559	* the heap and attached to 'str' so
560	* they can be released as appropriate.
561	*/
562	char *str;
563	/* A timestamp for the stats
564	*/
565	TimeStamp age;
566	} NfsNodeRec, *NfsNode;
567
568	/*****************************************
569	Forward Declarations
570	*****************************************/
571
572	static int nfs_readlink(
573	rtems_filesystem_location_info_t loc, / IN */
574	char buf, / OUT */
575	size_t len
576	);
577
578	static int updateAttr(NfsNode node, int force);
579
580	/* Mask bits when setting attributes.
581	* Only the 'arg' fields with their
582	* corresponding bit set in the mask
583	* will be used. The others are left
584	* unchanged.
585	* The 'TOUCH' bits instruct nfs_sattr()
586	* to update the respective time
587	* fields to the current time
588	*/
589	#define SATTR_MODE (1<<0)
590	#define SATTR_UID (1<<1)
591	#define SATTR_GID (1<<2)
592	#define SATTR_SIZE (1<<3)
593	#define SATTR_ATIME (1<<4)
594	#define SATTR_TOUCHA (1<<5)
595	#define SATTR_MTIME (1<<6)
596	#define SATTR_TOUCHM (1<<7)
597	#define SATTR_TOUCH (SATTR_TOUCHM \| SATTR_TOUCHA)
598
599	static int
600	nfs_sattr(NfsNode node, sattr *arg, u_long mask);
601
602	extern struct _rtems_filesystem_operations_table nfs_fs_ops;
603	static struct _rtems_filesystem_file_handlers_r nfs_file_file_handlers;
604	static struct _rtems_filesystem_file_handlers_r nfs_dir_file_handlers;
605	static struct _rtems_filesystem_file_handlers_r nfs_link_file_handlers;
606	static rtems_driver_address_table drvNfs;
607
608	int
609	nfsMountsShow(FILE*);
610
611	rtems_status_code
612	rtems_filesystem_resolve_location(char buf, int len, rtems_filesystem_location_info_t loc);
613
614
615	/*****************************************
616	Inline Routines
617	*****************************************/
618
619
620	/* * * * * * * * * * * * * * * * * *
621	Trivial Operations on a NfsNode
622	* * * * * * * * * * * * * * * * * */
623
624	/* determine if a location 'l' is an NFS root node */
625	static inline int
626	locIsRoot(rtems_filesystem_location_info_t *l)
627	{
628	NfsNode me = (NfsNode) l->node_access;
629	NfsNode r;
630	r = (NfsNode)l->mt_entry->mt_fs_root.node_access;
631	return SERP_ATTR(r).fileid == SERP_ATTR(me).fileid &&
632	SERP_ATTR(r).fsid == SERP_ATTR(me).fsid;
633	}
634
635	/* determine if a location 'l' is an NFS node */
636	static inline int
637	locIsNfs(rtems_filesystem_location_info_t *l)
638	{
639	return l->ops == &nfs_fs_ops;
640	}
641
642	/* determine if two locations refer to the
643	* same entity. We know that 'nfsloc' is a
644	* location inside nfs. However, we needn't
645	* know anything about 'anyloc'.
646	*/
647	static inline int
648	locAreEqual(
649	rtems_filesystem_location_info_t *nfsloc,
650	rtems_filesystem_location_info_t *anyloc
651	)
652	{
653	NfsNode na = (NfsNode) nfsloc->node_access;
654	NfsNode nb;
655
656	if (!locIsNfs(anyloc))
657	return 0;
658
659	nb = (NfsNode) anyloc->node_access;
660
661	if (na->nfs != nb->nfs)
662	return 0;
663
664	updateAttr(nb, 0);
665
666	return SERP_ATTR(na).fileid == SERP_ATTR(nb).fileid &&
667	SERP_ATTR(na).fsid == SERP_ATTR(nb).fsid;
668	}
669
670
671
672	/*****************************************
673	Global Variables
674	*****************************************/
675
676	/* These are (except for MAXNAMLEN/MAXPATHLEN) copied from IMFS */
677
678	static rtems_filesystem_limits_and_options_t
679	nfs_limits_and_options = {
680	5, /* link_max */
681	6, /* max_canon */
682	7, /* max_input */
683	NFS_MAXNAMLEN, /* name_max */
684	NFS_MAXPATHLEN, /* path_max */
685	2, /* pipe_buf */
686	1, /* posix_async_io */
687	2, /* posix_chown_restrictions */
688	3, /* posix_no_trunc */
689	4, /* posix_prio_io */
690	5, /* posix_sync_io */
691	6 /* posix_vdisable */
692	};
693
694	/* size of an encoded 'entry' object */
695	static int dirres_entry_size;
696
697	/* Global stuff and statistics */
698	static struct nfsstats {
699	/* A lock for protecting the
700	* linked ist of mounted NFS
701	* and the num_mounted_fs field
702	*/
703	rtems_id llock;
704	/* A lock for protecting misc
705	* stuff within the driver.
706	* The lock must only be held
707	* for short periods of time.
708	*/
709	rtems_id lock;
710	/* Our major number as assigned
711	* by RTEMS
712	*/
713	rtems_device_major_number nfs_major;
714	/* The number of currently
715	* mounted NFS
716	*/
717	int num_mounted_fs;
718	/* A list of the currently
719	* mounted NFS
720	*/
721	struct NfsRec_ *mounted_fs;
722	/* A counter for allocating
723	* unique IDs to each mounted
724	* NFS.
725	* Assume we are not going to
726	* do more than 16k mounts
727	* during the system lifetime
728	*/
729	u_short fs_ids;
730	} nfsGlob = {0/* IMPORTANT */};
731
732	/*
733	* Global variable to tune the 'st_blksize' (stat(2)) value this nfs
734	* client should report.
735	* size on the server.
736	*/
737	#ifndef DEFAULT_NFS_ST_BLKSIZE
738	#define DEFAULT_NFS_ST_BLKSIZE NFS_MAXDATA
739	#endif
740	int nfsStBlksize = DEFAULT_NFS_ST_BLKSIZE;
741
742	/* Two pools of RPC transactions;
743	* One with small send buffers
744	* the other with a big one.
745	* The actual size of the small
746	* buffer is configurable (see top).
747	*
748	* Note: The RX buffers are always
749	* big
750	*/
751	static RpcUdpXactPool smallPool = 0;
752	static RpcUdpXactPool bigPool = 0;
753
754
755	/*****************************************
756	Implementation
757	*****************************************/
758
759	/* Create a Nfs object. This is
760	* per-mounted NFS information.
761	*
762	* ARGS: The Nfs server handle.
763	*
764	* RETURNS: Nfs on success,
765	* NULL on failure with
766	* errno set
767	*
768	* NOTE: The submitted server
769	* object is 'owned' by
770	* this Nfs and will be
771	* destroyed by nfsDestroy()
772	*/
773	static Nfs
774	nfsCreate(RpcUdpServer server)
775	{
776	Nfs rval = calloc(1,sizeof(*rval));
777
778	if (rval) {
779	rval->server = server;
780	LOCK(nfsGlob.llock);
781	rval->next = nfsGlob.mounted_fs;
782	nfsGlob.mounted_fs = rval;
783	UNLOCK(nfsGlob.llock);
784	} else {
785	errno = ENOMEM;
786	}
787	return rval;
788	}
789
790	/* Destroy an Nfs object and
791	* its associated server
792	*/
793	static void
794	nfsDestroy(Nfs nfs)
795	{
796	register Nfs prev;
797	if (!nfs)
798	return;
799
800	LOCK(nfsGlob.llock);
801	if (nfs == nfsGlob.mounted_fs)
802	nfsGlob.mounted_fs = nfs->next;
803	else {
804	for (prev = nfsGlob.mounted_fs;
805	prev && prev->next != nfs;
806	prev = prev->next)
807	/* nothing else to do */;
808	assert( prev );
809	prev->next = nfs->next;
810	}
811	UNLOCK(nfsGlob.llock);
812
813	nfs->next = 0; /* paranoia */
814	rpcUdpServerDestroy(nfs->server);
815	free(nfs);
816	}
817
818	/*
819	* Create a Node. The node will
820	* be associated with a particular
821	* mounted NFS identified by 'nfs'
822	* Optionally, a NFS file handle
823	* may be copied into this node.
824	*
825	* ARGS: nfs of the NFS this node
826	* belongs to.
827	* NFS file handle identifying
828	* this node.
829	* RETURNS: node on success,
830	* NULL on failure with errno
831	* set.
832	*
833	* NOTE: The caller of this routine
834	* is responsible for copying
835	* a NFS file handle if she
836	* choses to pass a NULL fh.
837	*
838	* The driver code assumes the
839	* a node always has a valid
840	* NFS filehandle and file
841	* attributes (unless the latter
842	* are aged).
843	*/
844	static NfsNode
845	nfsNodeCreate(Nfs nfs, fhandle *fh)
846	{
847	NfsNode rval = malloc(sizeof(*rval));
848	unsigned long flags;
849
850	#if DEBUG & DEBUG_TRACK_NODES
851	fprintf(stderr,"NFS: creating a node\n");
852	#endif
853
854	if (rval) {
855	if (fh)
856	memcpy( &SERP_FILE(rval), fh, sizeof(*fh) );
857	rtems_interrupt_disable(flags);
858	nfs->nodesInUse++;
859	rtems_interrupt_enable(flags);
860	rval->nfs = nfs;
861	rval->str = 0;
862	} else {
863	errno = ENOMEM;
864	}
865
866	return rval;
867	}
868
869	/* destroy a node */
870	static void
871	nfsNodeDestroy(NfsNode node)
872	{
873	unsigned long flags;
874
875	#if DEBUG & DEBUG_TRACK_NODES
876	fprintf(stderr,"NFS: destroying a node\n");
877	#endif
878	#if 0
879	if (!node)
880	return;
881	/* this probably does nothing... */
882	xdr_free(xdr_serporid, &node->serporid);
883	#endif
884
885	rtems_interrupt_disable(flags);
886	node->nfs->nodesInUse--;
887	#if DEBUG & DEBUG_COUNT_NODES
888	if (node->str)
889	node->nfs->stringsInUse--;
890	#endif
891	rtems_interrupt_enable(flags);
892
893	if (node->str)
894	free(node->str);
895
896	free(node);
897	}
898
899	/* Clone a given node (AKA copy constructor),
900	* i.e. create an exact copy.
901	*
902	* ARGS: node to clone
903	* RETURNS: new node on success
904	* NULL on failure with errno set.
905	*
906	* NOTE: a string attached to 'str'
907	* is cloned as well. Outdated
908	* attributes (of the new copy
909	* only) will be refreshed
910	* (if unsuccessful, this could
911	* be a reason for failure to
912	* clone a node).
913	*/
914	static NfsNode
915	nfsNodeClone(NfsNode node)
916	{
917	NfsNode rval = nfsNodeCreate(node->nfs, 0);
918
919	if (rval) {
920	rval = node;
921
922	/* must clone the string also */
923	if (node->str) {
924	rval->args.name = rval->str = strdup(node->str);
925	if (!rval->str) {
926	nfsNodeDestroy(rval);
927	return 0;
928	}
929	#if DEBUG & DEBUG_COUNT_NODES
930	{ unsigned long flags;
931	rtems_interrupt_disable(flags);
932	node->nfs->stringsInUse++;
933	rtems_interrupt_enable(flags);
934	}
935	#endif
936	}
937
938	/* possibly update the stats */
939	if (updateAttr(rval, 0 /* only if necessary */)) {
940	nfsNodeDestroy(rval);
941	return 0;
942	}
943	}
944	return rval;
945	}
946
947	/* Initialize the driver.
948	*
949	* ARGS: depth of the small and big
950	* transaction pools, i.e. how
951	* many transactions (buffers)
952	* should always be kept around.
953	*
954	* (If more transactions are needed,
955	* they are created and destroyed
956	* on the fly).
957	*/
958	void
959	nfsInit(int smallPoolDepth, int bigPoolDepth)
960	{
961	static int initialised = 0;
962	entry dummy;
963
964	if (initialised)
965	return;
966
967	initialised = 1;
968
969	fprintf(stderr,
970	"RTEMS-NFS $Release$, " \
971	"Till Straumann, Stanford/SLAC/SSRL 2002, " \
972	"See LICENSE file for licensing info.\n");
973
974	/* Get a major number */
975
976	if (RTEMS_SUCCESSFUL != rtems_io_register_driver(0, &drvNfs, &nfsGlob.nfs_major)) {
977	fprintf(stderr,"Registering NFS driver failed - %s\n", strerror(errno));
978	return;
979	}
980
981	if (0==smallPoolDepth)
982	smallPoolDepth = 20;
983	if (0==bigPoolDepth)
984	bigPoolDepth = 10;
985
986	/* it's crucial to zero out the 'next' pointer
987	* because it terminates the xdr_entry recursion
988	*
989	* we also must make the filename some non-zero
990	* char pointer!
991	*/
992
993	memset(&dummy, 0, sizeof(dummy));
994
995	dummy.nextentry = 0;
996	dummy.name = "somename"; /* guess average length of a filename */
997	dirres_entry_size = xdr_sizeof((xdrproc_t)xdr_entry, &dummy);
998
999	assert( smallPool = rpcUdpXactPoolCreate(
1000	NFS_PROGRAM,
1001	NFS_VERSION_2,
1002	CONFIG_NFS_SMALL_XACT_SIZE,
1003	smallPoolDepth) );
1004
1005	assert( bigPool = rpcUdpXactPoolCreate(
1006	NFS_PROGRAM,
1007	NFS_VERSION_2,
1008	CONFIG_NFS_BIG_XACT_SIZE,
1009	bigPoolDepth) );
1010
1011	assert( RTEMS_SUCCESSFUL == rtems_semaphore_create(
1012	rtems_build_name('N','F','S','l'),
1013	1,
1014	MUTEX_ATTRIBUTES,
1015	0,
1016	&nfsGlob.llock) );
1017
1018	assert( RTEMS_SUCCESSFUL == rtems_semaphore_create(
1019	rtems_build_name('N','F','S','m'),
1020	1,
1021	MUTEX_ATTRIBUTES,
1022	0,
1023	&nfsGlob.lock) );
1024
1025	if (sizeof(ino_t) < sizeof(u_int)) {
1026	fprintf(stderr,
1027	"WARNING: Using 'short st_ino' hits performance and may fail to access/find correct files\n");
1028	fprintf(stderr,
1029	"you should fix newlib's sys/stat.h - for now I'll enable a hack...\n");
1030
1031	}
1032	}
1033
1034	/* Driver cleanup code
1035	*/
1036	int
1037	nfsCleanup(void)
1038	{
1039	rtems_id l;
1040	int refuse;
1041
1042	if (!nfsGlob.llock) {
1043	/* registering the driver failed - let them still cleanup */
1044	return 0;
1045	}
1046
1047	LOCK(nfsGlob.llock);
1048	if ( (refuse = nfsGlob.num_mounted_fs) ) {
1049	fprintf(stderr,"Refuse to unload NFS; %i filesystems still mounted.\n",
1050	refuse);
1051	nfsMountsShow(stderr);
1052	/* yes, printing is slow - but since you try to unload the driver,
1053	* you assume nobody is using NFS, so what if they have to wait?
1054	*/
1055	UNLOCK(nfsGlob.llock);
1056	return -1;
1057	}
1058
1059	rtems_semaphore_delete(nfsGlob.lock);
1060	nfsGlob.lock = 0;
1061
1062	/* hold the lock while cleaning up... */
1063
1064	rpcUdpXactPoolDestroy(smallPool);
1065	rpcUdpXactPoolDestroy(bigPool);
1066	l = nfsGlob.llock;
1067	rtems_io_unregister_driver(nfsGlob.nfs_major);
1068
1069	rtems_semaphore_delete(l);
1070	nfsGlob.llock = 0;
1071	return 0;
1072	}
1073
1074	/* NFS RPC wrapper.
1075	*
1076	* ARGS: srvr the NFS server we want to call
1077	* proc the NFSPROC_xx we want to invoke
1078	* xargs xdr routine to wrap the arguments
1079	* pargs pointer to the argument object
1080	* xres xdr routine to unwrap the results
1081	* pres pointer to the result object
1082	*
1083	* RETURNS: 0 on success, -1 on error with errno set.
1084	*
1085	* NOTE: the caller assumes that errno is set to
1086	* a nonzero value if this routine returns
1087	* an error (nonzero return value).
1088	*
1089	* This routine prints RPC error messages to
1090	* stderr.
1091	*/
1092	STATIC int
1093	nfscall(
1094	RpcUdpServer srvr,
1095	int proc,
1096	xdrproc_t xargs,
1097	void * pargs,
1098	xdrproc_t xres,
1099	void * pres)
1100	{
1101	RpcUdpXact xact;
1102	enum clnt_stat stat;
1103	RpcUdpXactPool pool;
1104	int rval = -1;
1105
1106
1107	switch (proc) {
1108	case NFSPROC_SYMLINK:
1109	case NFSPROC_WRITE:
1110	pool = bigPool; break;
1111	default: pool = smallPool; break;
1112	}
1113
1114	xact = rpcUdpXactPoolGet(pool, XactGetCreate);
1115
1116	if ( !xact ) {
1117	errno = ENOMEM;
1118	return -1;
1119	}
1120
1121	if ( RPC_SUCCESS != (stat=rpcUdpSend(
1122	xact,
1123	srvr,
1124	NFSCALL_TIMEOUT,
1125	proc,
1126	xres,
1127	pres,
1128	xargs,
1129	pargs,
1130	0)) \|\|
1131	RPC_SUCCESS != (stat=rpcUdpRcv(xact)) ) {
1132
1133	fprintf(stderr,
1134	"NFS (proc %i) - %s\n",
1135	proc,
1136	clnt_sperrno(stat));
1137
1138	switch (stat) {
1139	/* TODO: this is probably not complete and/or fully accurate */
1140	case RPC_CANTENCODEARGS : errno = EINVAL; break;
1141	case RPC_AUTHERROR : errno = EPERM; break;
1142
1143	case RPC_CANTSEND :
1144	case RPC_CANTRECV : /* hope they have errno set */
1145	case RPC_SYSTEMERROR : break;
1146
1147	default : errno = EIO; break;
1148	}
1149	} else {
1150	rval = 0;
1151	}
1152
1153	/* release the transaction back into the pool */
1154	rpcUdpXactPoolPut(xact);
1155
1156	if (rval && !errno)
1157	errno = EIO;
1158
1159	return rval;
1160	}
1161
1162	/* Check the 'age' of a node's stats
1163	* and read the attributes from the server
1164	* if necessary.
1165	*
1166	* ARGS: node node to update
1167	* force enforce updating ignoring
1168	* the timestamp/age
1169	*
1170	* RETURNS: 0 on success,
1171	* -1 on failure with errno set
1172	*/
1173
1174	static int
1175	updateAttr(NfsNode node, int force)
1176	{
1177
1178	if (force
1179	#ifdef CONFIG_ATTR_LIFETIME
1180	\|\| (nowSeconds() - node->age > CONFIG_ATTR_LIFETIME)
1181	#endif
1182	) {
1183	if ( nfscall(node->nfs->server,
1184	NFSPROC_GETATTR,
1185	(xdrproc_t)xdr_nfs_fh, &SERP_FILE(node),
1186	(xdrproc_t)xdr_attrstat, &node->serporid) )
1187	return -1;
1188
1189	if ( NFS_OK != node->serporid.status ) {
1190	errno = node->serporid.status;
1191	return -1;
1192	}
1193
1194	node->age = nowSeconds();
1195	}
1196
1197	return 0;
1198	}
1199
1200	/*
1201	* IP address helper. Note that we avoid
1202	* gethostbyname() since it's not reentrant.
1203	*
1204	* initialize a sockaddr_in from a
1205	* [<uid>'.'<gid>'@']<host>':'<path>" string and let
1206	* pPath point to the <path> part; retrieve the optional
1207	* uid/gids
1208	*
1209	* ARGS: see description above
1210	*
1211	* RETURNS: 0 on success,
1212	* -1 on failure with errno set
1213	*/
1214	static int
1215	buildIpAddr(u_long puid, u_long pgid,
1216	char *pHost, struct sockaddr_in psa,
1217	char **pPath)
1218	{
1219	char host[30];
1220	char chpt = pPath;
1221	char *path;
1222	int len;
1223
1224	if ( !chpt ) {
1225	errno = EINVAL;
1226	return -1;
1227	}
1228
1229	/* look for the optional uid/gid */
1230	if ( (chpt = strchr(chpt, UIDSEP)) ) {
1231	if ( 2 != sscanf(*pPath,"%li.%li",puid,pgid) ) {
1232	errno = EINVAL;
1233	return -1;
1234	}
1235	chpt++;
1236	} else {
1237	*puid = RPCIOD_DEFAULT_ID;
1238	*pgid = RPCIOD_DEFAULT_ID;
1239	chpt = *pPath;
1240	}
1241	if ( pHost )
1242	*pHost = chpt;
1243
1244	/* split the device name which is in the form
1245	*
1246	* <host_ip> ':' <path>
1247	*
1248	* into its components using a local buffer
1249	*/
1250
1251	if ( !(path = strchr(chpt, HOSTDELIM)) \|\|
1252	(len = path - chpt) >= sizeof(host) - 1 ) {
1253	errno = EINVAL;
1254	return -1;
1255	}
1256	/* point to path beyond ':' */
1257	path++;
1258
1259	strncpy(host, chpt, len);
1260	host[len]=0;
1261
1262	if ( ! inet_pton(AF_INET, host, &psa->sin_addr) ) {
1263	errno = ENXIO;
1264	return -1;
1265	}
1266
1267	psa->sin_family = AF_INET;
1268	psa->sin_port = 0;
1269	*pPath = path;
1270	return 0;
1271	}
1272
1273	/* wrapper similar to nfscall.
1274	* However, since it is not used
1275	* very often, the simpler and less
1276	* efficient rpcUdpCallRp API is used.
1277	*
1278	* ARGS: see 'nfscall()' above
1279	*
1280	* RETURNS: RPC status
1281	*/
1282	static enum clnt_stat
1283	mntcall(
1284	struct sockaddr_in *psrvr,
1285	int proc,
1286	xdrproc_t xargs,
1287	void * pargs,
1288	xdrproc_t xres,
1289	void * pres,
1290	u_long uid,
1291	u_long gid)
1292	{
1293	#ifdef MOUNT_V1_PORT
1294	int retry;
1295	#endif
1296	enum clnt_stat stat = RPC_FAILED;
1297
1298	#ifdef MOUNT_V1_PORT
1299	/* if the portmapper fails, retry a fixed port */
1300	for (retry = 1, psrvr->sin_port = 0, stat = RPC_FAILED;
1301	retry >= 0 && stat;
1302	stat && (psrvr->sin_port = htons(MOUNT_V1_PORT)), retry-- )
1303	#endif
1304	stat = rpcUdpCallRp(
1305	psrvr,
1306	MOUNTPROG,
1307	MOUNTVERS,
1308	proc,
1309	xargs,
1310	pargs,
1311	xres,
1312	pres,
1313	uid,
1314	gid,
1315	MNTCALL_TIMEOUT
1316	);
1317	return stat;
1318	}
1319
1320	/*****************************************
1321	RTEMS File System Operations for NFS
1322	*****************************************/
1323
1324	#if 0 /* for reference */
1325
1326	struct rtems_filesystem_location_info_tt
1327	{
1328	void *node_access;
1329	rtems_filesystem_file_handlers_r *handlers;
1330	rtems_filesystem_operations_table *ops;
1331	rtems_filesystem_mount_table_entry_t *mt_entry;
1332	};
1333
1334	#endif
1335
1336	/*
1337	* Evaluate a path letting 'pathloc' travel along.
1338	*
1339	* The important semantics of this operation are:
1340	*
1341	* If this routine returns -1, the caller assumes
1342	* pathloc to be _invalid_ and hence it will not
1343	* invoke rtems_filesystem_freenode() on it.
1344	*
1345	* OTOH, if evalpath returns 0,
1346	* rtems_filesystem_freenode() will eventually be
1347	* called which results in our freeing the associated
1348	* NfsNode attached to node_access.
1349	*
1350	* Therefore, this routine will _always_ allocate
1351	* a NfsNode and pass it out to *pathloc (provided
1352	* that the evaluation succeeds).
1353	*
1354	* However, if the evaluation finds that it has to
1355	* step across FS boundaries (mount point or a symlink
1356	* pointing outside), the NfsNode is destroyed
1357	* before passing control to the new FS' evalpath_h()
1358	*
1359	*/
1360
1361	STATIC int nfs_do_evalpath(
1362	const char pathname, / IN */
1363	void *arg,
1364	rtems_filesystem_location_info_t pathloc, / IN/OUT */
1365	int forMake
1366	)
1367	{
1368	char del = 0, part;
1369	int e = 0;
1370	NfsNode node = pathloc->node_access;
1371	char *p = malloc(MAXPATHLEN+1);
1372	Nfs nfs = (Nfs)pathloc->mt_entry->fs_info;
1373	RpcUdpServer server = nfs->server;
1374	unsigned long flags;
1375	#if DEBUG & DEBUG_COUNT_NODES
1376	unsigned long niu,siu;
1377	#endif
1378
1379	if ( !p ) {
1380	e = ENOMEM;
1381	goto cleanup;
1382	}
1383	strcpy(p, pathname);
1384
1385	LOCK(nfsGlob.lock);
1386	node = nfsNodeClone(node);
1387	UNLOCK(nfsGlob.lock);
1388
1389	/* from here on, the NFS is protected from being unmounted
1390	* since the node refcount is > 1
1391	*/
1392
1393	/* clone the node */
1394	if ( !node ) {
1395	/* nodeClone sets errno */
1396	goto cleanup;
1397	}
1398
1399	pathloc->node_access = node;
1400
1401	/* Special case: the RTEMS filesystem code
1402	* may emit '..' on a regular file node to
1403	* find the parent directory :-(.
1404	* (eval.c: rtems_filesystem_evaluate_parent())
1405	* Try to catch this case here:
1406	*/
1407	if ( NFDIR != SERP_ATTR(node).type && '.'==p && '.'==(p+1) ) {
1408	for ( part = p+2; '/'==*part; part++ )
1409	/* skip trailing '/' */;
1410	if ( !*part ) {
1411	/* this is it; back out dir and let them look up the dir itself... */
1412	memcpy( &SERP_FILE(node),
1413	&node->args.dir,
1414	sizeof(node->args.dir));
1415	*(p+1)=0;
1416	}
1417	}
1418
1419	for (part=p; part && *part; part=del) {
1420
1421	if ( NFLNK == SERP_ATTR(node).type ) {
1422	/* follow midpath link */
1423	char *b = malloc(NFS_MAXPATHLEN+1);
1424	int l;
1425
1426	if (!b) {
1427	e = ENOMEM;
1428	goto cleanup;
1429	}
1430	if (nfs_readlink(pathloc, b, NFS_MAXPATHLEN+1)) {
1431	free(b);
1432	e = errno;
1433	goto cleanup;
1434	}
1435
1436	/* prepend the link value to the rest of the path */
1437	if ( (l=strlen(b)) + strlen(part) + 1 > NFS_MAXPATHLEN ) {
1438	free(b);
1439	e = EINVAL;
1440	goto cleanup;
1441	}
1442	/* swap string buffers and reset delimiter */
1443	b[l++] = DELIM;
1444	strcpy(b+l,part);
1445	part = b;
1446	b = p;
1447	p = del = part;
1448
1449	free(b);
1450
1451	/* back up the directory filehandle (only necessary
1452	* if we don't back out to the root
1453	*/
1454	if (! (DELIM == *part) ) {
1455	memcpy( &SERP_FILE(node),
1456	&node->args.dir,
1457	sizeof(node->args.dir));
1458
1459	if (updateAttr(node, 1 /* force */)) {
1460	e = errno;
1461	goto cleanup;
1462	}
1463	}
1464	}
1465
1466	/* find delimiter and eat /// sequences
1467	* (only if we don't restart at the root)
1468	*/
1469	if ( DELIM != *part && (del = strchr(part, DELIM))) {
1470	do {
1471	*del++=0;
1472	} while (DELIM==*del);
1473	}
1474
1475	/* refuse to backup over the root */
1476	if ( 0==strcmp(part,UPDIR)
1477	&& locAreEqual(pathloc, &rtems_filesystem_root) ) {
1478	part++;
1479	}
1480
1481	/* cross mountpoint upwards */
1482	if ( (0==strcmp(part,UPDIR) && locIsRoot(pathloc)) /* cross mountpoint up */
1483	\|\| DELIM == part / link starts at root */
1484	) {
1485	int rval;
1486
1487	#if DEBUG & DEBUG_EVALPATH
1488	fprintf(stderr,
1489	"Crossing mountpoint upwards\n");
1490	#endif
1491
1492	if (DELIM == *part) {
1493	*pathloc = rtems_filesystem_root;
1494	} else {
1495	*pathloc = pathloc->mt_entry->mt_point_node;
1496	/* re-append the rest of the path */
1497	if (del)
1498	while ( 0 == *--del )
1499	*del = DELIM;
1500	}
1501
1502	nfsNodeDestroy(node);
1503
1504	#if DEBUG & DEBUG_EVALPATH
1505	fprintf(stderr,
1506	"Re-evaluating '%s'\n",
1507	part);
1508	#endif
1509
1510	if (forMake)
1511	rval = pathloc->ops->evalformake_h(part, pathloc, (const char**)arg);
1512	else
1513	rval = pathloc->ops->evalpath_h(part, (int)arg, pathloc);
1514
1515	free(p);
1516	return rval;
1517	}
1518
1519	/* lookup one element */
1520	SERP_ARGS(node).diroparg.name = part;
1521
1522	/* remember args / directory fh */
1523	memcpy( &node->args, &SERP_FILE(node), sizeof(node->args));
1524
1525	/* don't lookup the item we want to create */
1526	if ( forMake && (!del \|\| !*del) )
1527	break;
1528
1529	#if DEBUG & DEBUG_EVALPATH
1530	fprintf(stderr,"Looking up '%s'\n",part);
1531	#endif
1532
1533	if ( nfscall(server,
1534	NFSPROC_LOOKUP,
1535	(xdrproc_t)xdr_diropargs, &SERP_FILE(node),
1536	(xdrproc_t)xdr_serporid, &node->serporid) \|\|
1537	NFS_OK != (errno=node->serporid.status) ) {
1538	e = errno;
1539	goto cleanup;
1540	}
1541	node->age = nowSeconds();
1542
1543	#if DEBUG & DEBUG_EVALPATH
1544	if (NFLNK == SERP_ATTR(node).type && del) {
1545	fprintf(stderr,
1546	"Following midpath link '%s'\n",
1547	part);
1548	}
1549	#endif
1550
1551	}
1552
1553	if (forMake) {
1554	/* remember the name - do this _before_ copying
1555	* the name to local storage; the caller expects a
1556	* pointer into pathloc
1557	*/
1558	assert( node->args.name );
1559
1560	(const char*)arg = pathname + (node->args.name - p);
1561
1562	#if 0
1563	/* restore the directory node */
1564
1565	memcpy( &SERP_FILE(node),
1566	&node->args.dir,
1567	sizeof(node->args.dir));
1568
1569	if ( (nfscall(nfs->server,
1570	NFSPROC_GETATTR,
1571	(xdrproc_t)xdr_nfs_fh, &SERP_FILE(node),
1572	(xdrproc_t)xdr_attrstat, &node->serporid) && !errno && (errno = EIO)) \|\|
1573	(NFS_OK != (errno=node->serporid.status) ) ) {
1574	goto cleanup;
1575	}
1576	#endif
1577	}
1578
1579	if (locIsRoot(pathloc)) {
1580
1581	/* stupid filesystem code has no 'op' for comparing nodes
1582	* but just compares the 'node_access' pointers.
1583	* Luckily, this is only done for comparing the root nodes.
1584	* Hence, we never give them a copy of the root but always
1585	* the root itself.
1586	*/
1587	pathloc->node_access = pathloc->mt_entry->mt_fs_root.node_access;
1588	/* increment the 'in use' counter since we return one more
1589	* reference to the root node
1590	*/
1591	rtems_interrupt_disable(flags);
1592	nfs->nodesInUse++;
1593	rtems_interrupt_enable(flags);
1594	nfsNodeDestroy(node);
1595
1596
1597	} else {
1598	switch (SERP_ATTR(node).type) {
1599	case NFDIR: pathloc->handlers = &nfs_dir_file_handlers; break;
1600	case NFREG: pathloc->handlers = &nfs_file_file_handlers; break;
1601	case NFLNK: pathloc->handlers = &nfs_link_file_handlers; break;
1602	default: pathloc->handlers = &rtems_filesystem_null_handlers; break;
1603	}
1604	pathloc->node_access = node;
1605
1606	/* remember the name of this directory entry */
1607
1608	if (node->args.name) {
1609	if (node->str) {
1610	#if DEBUG & DEBUG_COUNT_NODES
1611	rtems_interrupt_disable(flags);
1612	nfs->stringsInUse--;
1613	rtems_interrupt_enable(flags);
1614	#endif
1615	free(node->str);
1616	}
1617	node->args.name = node->str = strdup(node->args.name);
1618	if (!node->str) {
1619	e = ENOMEM;
1620	goto cleanup;
1621	}
1622
1623	#if DEBUG & DEBUG_COUNT_NODES
1624	rtems_interrupt_disable(flags);
1625	nfs->stringsInUse++;
1626	rtems_interrupt_enable(flags);
1627	#endif
1628	}
1629
1630	}
1631	node = 0;
1632
1633	e = 0;
1634
1635	cleanup:
1636	free(p);
1637	#if DEBUG & DEBUG_COUNT_NODES
1638	/* cache counters; nfs may be unmounted by other thread after the last
1639	* node is destroyed
1640	*/
1641	niu = nfs->nodesInUse;
1642	siu = nfs->stringsInUse;
1643	#endif
1644	if (node) {
1645	nfsNodeDestroy(node);
1646	pathloc->node_access = 0;
1647	}
1648	#if DEBUG & DEBUG_COUNT_NODES
1649	fprintf(stderr,
1650	"leaving evalpath, in use count is %i nodes, %i strings\n",
1651	niu,siu);
1652	#endif
1653	if (e) {
1654	#if DEBUG & DEBUG_EVALPATH
1655	perror("Evalpath");
1656	#endif
1657	rtems_set_errno_and_return_minus_one(e);
1658	} else {
1659	return 0;
1660	}
1661	}
1662
1663	/* MANDATORY; may set errno=ENOSYS and return -1 */
1664	static int nfs_evalformake(
1665	const char path, / IN */
1666	rtems_filesystem_location_info_t pathloc, / IN/OUT */
1667	const char *pname / OUT */
1668	)
1669	{
1670	return nfs_do_evalpath(path, (void)pname, pathloc, 1 /forMake*/);
1671	}
1672
1673	static int nfs_evalpath(
1674	const char path, / IN */
1675	int flags, /* IN */
1676	rtems_filesystem_location_info_t pathloc / IN/OUT */
1677	)
1678	{
1679	return nfs_do_evalpath(path, (void)flags, pathloc, 0 /not forMake*/);
1680	}
1681
1682
1683	/* create a hard link */
1684
1685	static int nfs_link(
1686	rtems_filesystem_location_info_t to_loc, / IN */
1687	rtems_filesystem_location_info_t parent_loc, / IN */
1688	const char name / IN */
1689	)
1690	{
1691	NfsNode pNode;
1692	nfsstat status;
1693	NfsNode tNode = to_loc->node_access;
1694
1695	#if DEBUG & DEBUG_SYSCALLS
1696	fprintf(stderr,"Creating link '%s'\n",name);
1697	#endif
1698
1699	if ( !locIsNfs(parent_loc) ) {
1700	errno = EXDEV;
1701	return -1;
1702	}
1703
1704	pNode = parent_loc->node_access;
1705	if ( tNode->nfs != pNode->nfs ) {
1706	errno = EXDEV;
1707	return -1;
1708	}
1709	memcpy(&SERP_ARGS(tNode).linkarg.to.dir,
1710	&SERP_FILE(pNode),
1711	sizeof(SERP_FILE(pNode)));
1712
1713	SERP_ARGS(tNode).linkarg.to.name = (filename)name;
1714
1715	if ( nfscall(tNode->nfs->server,
1716	NFSPROC_LINK,
1717	(xdrproc_t)xdr_linkargs, &SERP_FILE(tNode),
1718	(xdrproc_t)xdr_nfsstat, &status)
1719	\|\| (NFS_OK != (errno = status))
1720	) {
1721	#if DEBUG & DEBUG_SYSCALLS
1722	perror("nfs_link");
1723	#endif
1724	return -1;
1725	}
1726
1727	return 0;
1728
1729	}
1730
1731	static int nfs_do_unlink(
1732	rtems_filesystem_location_info_t loc, / IN */
1733	int proc
1734	)
1735	{
1736	nfsstat status;
1737	NfsNode node = loc->node_access;
1738	Nfs nfs = node->nfs;
1739	#if DEBUG & DEBUG_SYSCALLS
1740	char *name = NFSPROC_REMOVE == proc ?
1741	"nfs_unlink" : "nfs_rmdir";
1742	#endif
1743
1744	/* The FS generics have determined that pathloc is _not_
1745	* a directory. Hence we may assume that the parent
1746	* is in our NFS.
1747	*/
1748
1749	#if DEBUG & DEBUG_SYSCALLS
1750	assert( node->args.name == node->str && node->str );
1751
1752	fprintf(stderr,"%s '%s'\n", name, node->args.name);
1753	#endif
1754
1755	if ( nfscall(nfs->server,
1756	proc,
1757	(xdrproc_t)xdr_diropargs, &node->args,
1758	(xdrproc_t)xdr_nfsstat, &status)
1759	\|\| (NFS_OK != (errno = status))
1760	) {
1761	#if DEBUG & DEBUG_SYSCALLS
1762	perror(name);
1763	#endif
1764	return -1;
1765	}
1766
1767	return 0;
1768	}
1769
1770	static int nfs_unlink(
1771	rtems_filesystem_location_info_t loc / IN */
1772	)
1773	{
1774	return nfs_do_unlink(loc, NFSPROC_REMOVE);
1775	}
1776
1777	static int nfs_chown(
1778	rtems_filesystem_location_info_t pathloc, / IN */
1779	uid_t owner, /* IN */
1780	gid_t group /* IN */
1781	)
1782	{
1783	sattr arg;
1784
1785	arg.uid = owner;
1786	arg.gid = group;
1787
1788	return nfs_sattr(pathloc->node_access, &arg, SATTR_UID \| SATTR_GID);
1789
1790	}
1791
1792	/* Cleanup the FS private info attached to pathloc->node_access */
1793	static int nfs_freenode(
1794	rtems_filesystem_location_info_t pathloc / IN */
1795	)
1796	{
1797	Nfs nfs = ((NfsNode)pathloc->node_access)->nfs;
1798
1799	#if DEBUG & DEBUG_COUNT_NODES
1800	/* print counts at entry where they are > 0 so 'nfs' is safe from being destroyed
1801	* and there's no race condition
1802	*/
1803	fprintf(stderr,
1804	"entering freenode, in use count is %i nodes, %i strings\n",
1805	nfs->nodesInUse,
1806	nfs->stringsInUse);
1807	#endif
1808
1809	/* never destroy the root node; it is released by the unmount
1810	* code
1811	*/
1812	if (locIsRoot(pathloc)) {
1813	unsigned long flags;
1814	/* just adjust the references to the root node but
1815	* don't really release it
1816	*/
1817	rtems_interrupt_disable(flags);
1818	nfs->nodesInUse--;
1819	rtems_interrupt_enable(flags);
1820	} else {
1821	nfsNodeDestroy(pathloc->node_access);
1822	pathloc->node_access = 0;
1823	}
1824	return 0;
1825	}
1826
1827	/* NOTE/TODO: mounting on top of NFS is not currently supported
1828	*
1829	* Challenge: stateless protocol. It would be possible to
1830	* delete mount points on the server. We would need some sort
1831	* of a 'garbage collector' looking for dead/unreachable
1832	* mount points and unmounting them.
1833	* Also, the path evaluation routine would have to check
1834	* for crossing mount points. Crossing over from one NFS
1835	* into another NFS could probably handled iteratively
1836	* rather than by recursion.
1837	*/
1838
1839	#ifdef DECLARE_BODY
1840	/* This routine is called when they try to mount something
1841	* on top of THIS filesystem, i.e. if one of our directories
1842	* is used as a mount point
1843	*/
1844	static int nfs_mount(
1845	rtems_filesystem_mount_table_entry_t mt_entry / in */
1846	)DECLARE_BODY
1847	#else
1848	#define nfs_mount 0
1849	#endif
1850
1851	#ifdef DECLARE_BODY
1852	/* This op is called when they try to unmount a FS
1853	* from a mountpoint managed by THIS FS.
1854	*/
1855	static int nfs_unmount(
1856	rtems_filesystem_mount_table_entry_t mt_entry / in */
1857	)DECLARE_BODY
1858	#else
1859	#define nfs_unmount 0
1860	#endif
1861
1862	#if 0
1863
1864	/* for reference (libio.h) */
1865
1866	struct rtems_filesystem_mount_table_entry_tt {
1867	Chain_Node Node;
1868	rtems_filesystem_location_info_t mt_point_node;
1869	rtems_filesystem_location_info_t mt_fs_root;
1870	int options;
1871	void *fs_info;
1872
1873	rtems_filesystem_limits_and_options_t pathconf_limits_and_options;
1874
1875	/*
1876	* When someone adds a mounted filesystem on a real device,
1877	* this will need to be used.
1878	*
1879	* The best option long term for this is probably an open file descriptor.
1880	*/
1881	char *dev;
1882	};
1883	#endif
1884
1885
1886	/* This op is called as the last step of mounting this FS */
1887	STATIC int nfs_fsmount_me(
1888	rtems_filesystem_mount_table_entry_t *mt_entry
1889	)
1890	{
1891	char *host;
1892	struct sockaddr_in saddr;
1893	enum clnt_stat stat;
1894	fhstatus fhstat;
1895	u_long uid,gid;
1896	#ifdef NFS_V2_PORT
1897	int retry;
1898	#endif
1899	Nfs nfs = 0;
1900	NfsNode rootNode = 0;
1901	RpcUdpServer nfsServer = 0;
1902	int e = -1;
1903	char *path = mt_entry->dev;
1904
1905
1906	if ( buildIpAddr(&uid, &gid, &host, &saddr, &path) )
1907	return -1;
1908
1909
1910	#ifdef NFS_V2_PORT
1911	/* if the portmapper fails, retry a fixed port */
1912	for (retry = 1, saddr.sin_port = 0, stat = RPC_FAILED;
1913	retry >= 0 && stat;
1914	stat && (saddr.sin_port = htons(NFS_V2_PORT)), retry-- )
1915	#endif
1916	stat = rpcUdpServerCreate(
1917	&saddr,
1918	NFS_PROGRAM,
1919	NFS_VERSION_2,
1920	uid,
1921	gid,
1922	&nfsServer
1923	);
1924
1925	if ( RPC_SUCCESS != stat ) {
1926	fprintf(stderr,
1927	"Unable to contact NFS server - invalid port? (%s)\n",
1928	clnt_sperrno(stat));
1929	e = EPROTONOSUPPORT;
1930	goto cleanup;
1931	}
1932
1933
1934	/* first, try to ping the NFS server by
1935	* calling the NULL proc.
1936	*/
1937	if ( nfscall(nfsServer,
1938	NFSPROC_NULL,
1939	(xdrproc_t)xdr_void, 0,
1940	(xdrproc_t)xdr_void, 0) ) {
1941
1942	fputs("NFS Ping ",stderr);
1943	fwrite(host, 1, path-host-1, stderr);
1944	fprintf(stderr," failed: %s\n", strerror(errno));
1945
1946	e = errno ? errno : EIO;
1947	goto cleanup;
1948	}
1949
1950	/* that seemed to work - we now try the
1951	* actual mount
1952	*/
1953
1954	/* reuse server address but let the mntcall()
1955	* search for the mountd's port
1956	*/
1957	saddr.sin_port = 0;
1958
1959	stat = mntcall( &saddr,
1960	MOUNTPROC_MNT,
1961	(xdrproc_t)xdr_dirpath,
1962	&path,
1963	(xdrproc_t)xdr_fhstatus,
1964	&fhstat,
1965	uid,
1966	gid );
1967
1968	if (stat) {
1969	fprintf(stderr,"MOUNT -- %s\n",clnt_sperrno(stat));
1970	if ( e<=0 )
1971	e = EIO;
1972	goto cleanup;
1973	} else if (NFS_OK != (e=fhstat.fhs_status)) {
1974	fprintf(stderr,"MOUNT: %s\n",strerror(e));
1975	goto cleanup;
1976	}
1977
1978	assert( nfs = nfsCreate(nfsServer) );
1979	nfsServer = 0;
1980
1981	nfs->uid = uid;
1982	nfs->gid = gid;
1983
1984	/* that seemed to work - we now create the root node
1985	* and we also must obtain the root node attributes
1986	*/
1987	assert( rootNode = nfsNodeCreate(nfs, &fhstat.fhstatus_u.fhs_fhandle) );
1988
1989	if ( updateAttr(rootNode, 1 /* force */) ) {
1990	e = errno;
1991	goto cleanup;
1992	}
1993
1994	/* looks good so far */
1995
1996	mt_entry->mt_fs_root.node_access = rootNode;
1997
1998	rootNode = 0;
1999
2000	mt_entry->mt_fs_root.ops = &nfs_fs_ops;
2001	mt_entry->mt_fs_root.handlers = &nfs_dir_file_handlers;
2002	mt_entry->pathconf_limits_and_options = nfs_limits_and_options;
2003
2004	LOCK(nfsGlob.llock);
2005	nfsGlob.num_mounted_fs++;
2006	/* allocate a new ID for this FS */
2007	nfs->id = nfsGlob.fs_ids++;
2008	UNLOCK(nfsGlob.llock);
2009
2010	mt_entry->fs_info = nfs;
2011	nfs->mt_entry = mt_entry;
2012	nfs = 0;
2013
2014	e = 0;
2015
2016	cleanup:
2017	if (nfs)
2018	nfsDestroy(nfs);
2019	if (nfsServer)
2020	rpcUdpServerDestroy(nfsServer);
2021	if (rootNode)
2022	nfsNodeDestroy(rootNode);
2023	if (e)
2024	rtems_set_errno_and_return_minus_one(e);
2025	else
2026	return 0;
2027	}
2028
2029	/* This op is called when they try to unmount THIS fs */
2030	STATIC int nfs_fsunmount_me(
2031	rtems_filesystem_mount_table_entry_t mt_entry / in */
2032	)
2033	{
2034	enum clnt_stat stat;
2035	struct sockaddr_in saddr;
2036	char *path = mt_entry->dev;
2037	int nodesInUse;
2038	u_long uid,gid;
2039
2040	LOCK(nfsGlob.llock);
2041	nodesInUse = ((Nfs)mt_entry->fs_info)->nodesInUse;
2042
2043	if (nodesInUse > 1 /* one ref to the root node used by us */) {
2044	UNLOCK(nfsGlob.llock);
2045	fprintf(stderr,
2046	"Refuse to unmount; there are still %i nodes in use (1 used by us)\n",
2047	nodesInUse);
2048	rtems_set_errno_and_return_minus_one(EBUSY);
2049	}
2050
2051	assert( 0 == buildIpAddr(&uid, &gid, 0, &saddr, &path) );
2052
2053	stat = mntcall( &saddr,
2054	MOUNTPROC_UMNT,
2055	(xdrproc_t)xdr_dirpath, &path,
2056	(xdrproc_t)xdr_void, 0,
2057	uid,
2058	gid
2059	);
2060
2061	if (stat) {
2062	UNLOCK(nfsGlob.llock);
2063	fprintf(stderr,"NFS UMOUNT -- %s\n", clnt_sperrno(stat));
2064	errno = EIO;
2065	return -1;
2066	}
2067
2068	nfsNodeDestroy(mt_entry->mt_fs_root.node_access);
2069	mt_entry->mt_fs_root.node_access = 0;
2070
2071	nfsDestroy(mt_entry->fs_info);
2072	mt_entry->fs_info = 0;
2073
2074	nfsGlob.num_mounted_fs--;
2075	UNLOCK(nfsGlob.llock);
2076
2077	return 0;
2078	}
2079
2080	/* OPTIONAL; may be NULL - BUT: CAUTION; mount() doesn't check
2081	* for this handler to be present - a fs bug
2082	* //NOTE: (10/25/2002) patch submitted and probably applied
2083	*/
2084	static rtems_filesystem_node_types_t nfs_node_type(
2085	rtems_filesystem_location_info_t pathloc / in */
2086	)
2087	{
2088	NfsNode node = pathloc->node_access;
2089
2090	if (updateAttr(node, 0 /* only if old */))
2091	return -1;
2092
2093	switch( SERP_ATTR(node).type ) {
2094	default:
2095	/* rtems has no value for 'unknown';
2096	*/
2097	case NFNON:
2098	case NFSOCK:
2099	case NFBAD:
2100	case NFFIFO:
2101	break;
2102
2103
2104	case NFREG: return RTEMS_FILESYSTEM_MEMORY_FILE;
2105	case NFDIR: return RTEMS_FILESYSTEM_DIRECTORY;
2106
2107	case NFBLK:
2108	case NFCHR: return RTEMS_FILESYSTEM_DEVICE;
2109
2110	case NFLNK: return RTEMS_FILESYSTEM_SYM_LINK;
2111	}
2112	return -1;
2113	}
2114
2115	static int nfs_mknod(
2116	const char path, / IN */
2117	mode_t mode, /* IN */
2118	dev_t dev, /* IN */
2119	rtems_filesystem_location_info_t pathloc / IN/OUT */
2120	)
2121	{
2122	rtems_clock_time_value now;
2123	diropres res;
2124	NfsNode node = pathloc->node_access;
2125	mode_t type = S_IFMT & mode;
2126
2127	if (type != S_IFDIR && type != S_IFREG)
2128	rtems_set_errno_and_return_minus_one(ENOTSUP);
2129
2130	#if DEBUG & DEBUG_SYSCALLS
2131	fprintf(stderr,"nfs_mknod: creating %s\n", path);
2132	#endif
2133
2134	rtems_clock_get(RTEMS_CLOCK_GET_TIME_VALUE, &now);
2135
2136	SERP_ARGS(node).createarg.name = (filename)path;
2137	SERP_ARGS(node).createarg.attributes.mode = mode;
2138	/* TODO: either use our uid or use the Nfs credentials */
2139	SERP_ARGS(node).createarg.attributes.uid = 0;
2140	SERP_ARGS(node).createarg.attributes.gid = 0;
2141	SERP_ARGS(node).createarg.attributes.size = 0;
2142	SERP_ARGS(node).createarg.attributes.atime.seconds = now.seconds;
2143	SERP_ARGS(node).createarg.attributes.atime.useconds = now.microseconds;
2144	SERP_ARGS(node).createarg.attributes.mtime.seconds = now.seconds;
2145	SERP_ARGS(node).createarg.attributes.mtime.useconds = now.microseconds;
2146
2147	if ( nfscall( node->nfs->server,
2148	NFSPROC_CREATE,
2149	(xdrproc_t)xdr_createargs, &SERP_FILE(node),
2150	(xdrproc_t)xdr_diropres, &res)
2151	\|\| (NFS_OK != (errno = res.status)) ) {
2152	#if DEBUG & DEBUG_SYSCALLS
2153	perror("nfs_mknod");
2154	#endif
2155	return -1;
2156	}
2157
2158	return 0;
2159	}
2160
2161	static int nfs_utime(
2162	rtems_filesystem_location_info_t pathloc, / IN */
2163	time_t actime, /* IN */
2164	time_t modtime /* IN */
2165	)
2166	{
2167	sattr arg;
2168
2169	/* TODO: add rtems EPOCH - UNIX EPOCH seconds */
2170	arg.atime.seconds = actime;
2171	arg.atime.useconds = 0;
2172	arg.mtime.seconds = modtime;
2173	arg.mtime.useconds = 0;
2174
2175	return nfs_sattr(pathloc->node_access, &arg, SATTR_ATIME \| SATTR_MTIME);
2176	}
2177
2178	static int nfs_symlink(
2179	rtems_filesystem_location_info_t loc, / IN */
2180	const char link_name, / IN */
2181	const char *node_name
2182	)
2183	{
2184	rtems_clock_time_value now;
2185	nfsstat status;
2186	NfsNode node = loc->node_access;
2187
2188
2189	#if DEBUG & DEBUG_SYSCALLS
2190	fprintf(stderr,"nfs_symlink: creating %s -> %s\n", link_name, node_name);
2191	#endif
2192
2193	rtems_clock_get(RTEMS_CLOCK_GET_TIME_VALUE, &now);
2194
2195	SERP_ARGS(node).symlinkarg.name = (filename)link_name;
2196	SERP_ARGS(node).symlinkarg.to = (nfspath) node_name;
2197
2198	SERP_ARGS(node).symlinkarg.attributes.mode = S_IFLNK \| S_IRWXU \| S_IRWXG \| S_IRWXO;
2199	/* TODO */
2200	SERP_ARGS(node).symlinkarg.attributes.uid = 0;
2201	SERP_ARGS(node).symlinkarg.attributes.gid = 0;
2202	SERP_ARGS(node).symlinkarg.attributes.size = 0;
2203	SERP_ARGS(node).symlinkarg.attributes.atime.seconds = now.seconds;
2204	SERP_ARGS(node).symlinkarg.attributes.atime.useconds = now.microseconds;
2205	SERP_ARGS(node).symlinkarg.attributes.mtime.seconds = now.seconds;
2206	SERP_ARGS(node).symlinkarg.attributes.mtime.useconds = now.microseconds;
2207
2208	if ( nfscall( node->nfs->server,
2209	NFSPROC_SYMLINK,
2210	(xdrproc_t)xdr_symlinkargs, &SERP_FILE(node),
2211	(xdrproc_t)xdr_nfsstat, &status)
2212	\|\| (NFS_OK != (errno = status)) ) {
2213	#if DEBUG & DEBUG_SYSCALLS
2214	perror("nfs_symlink");
2215	#endif
2216	return -1;
2217	}
2218
2219	return 0;
2220	}
2221
2222	static int nfs_do_readlink(
2223	rtems_filesystem_location_info_t loc, / IN */
2224	strbuf psbuf / IN/OUT */
2225	)
2226	{
2227	NfsNode node = loc->node_access;
2228	Nfs nfs = node->nfs;
2229	readlinkres_strbuf rr;
2230	int wasAlloced;
2231	int rval;
2232
2233	rr.strbuf = *psbuf;
2234
2235	wasAlloced = (0 == psbuf->buf);
2236
2237	if ( (rval = nfscall(nfs->server,
2238	NFSPROC_READLINK,
2239	(xdrproc_t)xdr_nfs_fh, &SERP_FILE(node),
2240	(xdrproc_t)xdr_readlinkres_strbuf, &rr)) ) {
2241	if (wasAlloced)
2242	xdr_free( (xdrproc_t)xdr_strbuf, (caddr_t)&rr.strbuf );
2243	}
2244
2245
2246	if (NFS_OK != rr.status) {
2247	if (wasAlloced)
2248	xdr_free( (xdrproc_t)xdr_strbuf, (caddr_t)&rr.strbuf );
2249	rtems_set_errno_and_return_minus_one(rr.status);
2250	}
2251
2252	*psbuf = rr.strbuf;
2253
2254	return 0;
2255	}
2256
2257	static int nfs_readlink(
2258	rtems_filesystem_location_info_t loc, / IN */
2259	char buf, / OUT */
2260	size_t len
2261	)
2262	{
2263	strbuf sbuf;
2264	sbuf.buf = buf;
2265	sbuf.max = len;
2266
2267	return nfs_do_readlink(loc, &sbuf);
2268	}
2269
2270	/* The semantics of this routine are:
2271	*
2272	* The caller submits a valid pathloc, i.e. it has
2273	* an NfsNode attached to node_access.
2274	* On return, pathloc points to the target node which
2275	* may or may not be an NFS node.
2276	* Hence, the original NFS node is released in either
2277	* case:
2278	* - link evaluation fails; pathloc points to no valid node
2279	* - link evaluation success; pathloc points to a new valid
2280	* node. If it's an NFS node, a new NfsNode will be attached
2281	* to node_access...
2282	*/
2283
2284	#define LINKVAL_BUFLEN (MAXPATHLEN+1)
2285	#define RVAL_ERR_BUT_DONT_FREENODE (-1)
2286	#define RVAL_ERR_AND_DO_FREENODE ( 1)
2287	#define RVAL_OK ( 0)
2288
2289	static int nfs_eval_link(
2290	rtems_filesystem_location_info_t pathloc, / IN/OUT */
2291	int flags /* IN */
2292	)
2293	{
2294	rtems_filesystem_node_types_t type;
2295	char *buf = malloc(LINKVAL_BUFLEN);
2296	int rval = RVAL_ERR_AND_DO_FREENODE;
2297
2298	if (!buf) {
2299	errno = ENOMEM;
2300	goto cleanup;
2301	}
2302
2303	/* in this loop, we must not use NFS specific ops as we might
2304	* step out of our FS during the process...
2305	* This algorithm should actually be performed by the
2306	* generic's evaluate_path routine :-(
2307	*
2308	* Unfortunately, there is no way of finding the
2309	* directory node who contains 'pathloc', however :-(
2310	*/
2311	do {
2312	/* assume the generics have verified 'pathloc' to be
2313	* a link...
2314	*/
2315	if ( !pathloc->ops->readlink_h ) {
2316	errno = ENOTSUP;
2317	goto cleanup;
2318	}
2319
2320	if ( pathloc->ops->readlink_h(pathloc, buf, LINKVAL_BUFLEN) ) {
2321	goto cleanup;
2322	}
2323
2324	#if DEBUG & DEBUG_EVALPATH
2325	fprintf(stderr, "link value is '%s'\n", buf);
2326	#endif
2327
2328	/* is the link value an absolute path ? */
2329	if ( DELIM != *buf ) {
2330	/* NO; a relative path */
2331
2332	/* we must backup to the link's directory - we
2333	* know only how to do that for NFS, however.
2334	* In this special case, we can avoid recursion.
2335	* Otherwise (i.e. if the link is on another FS),
2336	* we must step into its eval_link_h().
2337	*/
2338	if (locIsNfs(pathloc)) {
2339	NfsNode node = pathloc->node_access;
2340	int err;
2341
2342	memcpy( &SERP_FILE(node),
2343	&node->args.dir,
2344	sizeof(node->args.dir) );
2345
2346	if (updateAttr(node, 1 /* force */))
2347	goto cleanup;
2348
2349	if (SERP_ATTR(node).type != NFDIR) {
2350	errno = ENOTDIR;
2351	goto cleanup;
2352	}
2353
2354	pathloc->handlers = &nfs_dir_file_handlers;
2355
2356	err = nfs_evalpath(buf, flags, pathloc);
2357
2358	/* according to its semantics,
2359	* nfs_evalpath cloned the node attached
2360	* to pathloc. Hence we have to
2361	* release the old one (referring to
2362	* the link; the new clone has been
2363	* updated and refers to the link _value_).
2364	*/
2365	nfsNodeDestroy(node);
2366
2367	if (err) {
2368	/* nfs_evalpath has set errno;
2369	* pathloc->node_access has no
2370	* valid node attached in this case
2371	*/
2372	rval = RVAL_ERR_BUT_DONT_FREENODE;
2373	goto cleanup;
2374	}
2375
2376	} else {
2377	if ( ! pathloc->ops->eval_link_h ) {
2378	errno = ENOTSUP;
2379	goto cleanup;
2380	}
2381	if (!pathloc->ops->eval_link_h(pathloc, flags)) {
2382	/* FS is responsible for freeing its pathloc->node_access
2383	* if necessary
2384	*/
2385	rval = RVAL_ERR_BUT_DONT_FREENODE;
2386	goto cleanup;
2387	}
2388	}
2389	} else {
2390	/* link points to an absolute path '/xxx' */
2391
2392	/* release this node; filesystem_evaluate_path() will
2393	* lookup a new one.
2394	*/
2395	rtems_filesystem_freenode(pathloc);
2396
2397	if (rtems_filesystem_evaluate_path(buf, flags, pathloc, 1)) {
2398	goto cleanup;
2399	}
2400	}
2401
2402	if ( !pathloc->ops->node_type_h ) {
2403	errno = ENOTSUP;
2404	goto cleanup;
2405	}
2406
2407	type = pathloc->ops->node_type_h(pathloc);
2408
2409
2410	/* I dont know what to do about hard links */
2411	} while ( RTEMS_FILESYSTEM_SYM_LINK == type );
2412
2413	rval = RVAL_OK;
2414
2415	cleanup:
2416
2417	free(buf);
2418
2419	if (RVAL_ERR_AND_DO_FREENODE == rval) {
2420	rtems_filesystem_freenode(pathloc);
2421	return -1;
2422	}
2423
2424	return rval;
2425	}
2426
2427
2428	struct _rtems_filesystem_operations_table nfs_fs_ops = {
2429	nfs_evalpath, /* MANDATORY */
2430	nfs_evalformake, /* MANDATORY; may set errno=ENOSYS and return -1 */
2431	nfs_link, /* OPTIONAL; may be NULL */
2432	nfs_unlink, /* OPTIONAL; may be NULL */
2433	nfs_node_type, /* OPTIONAL; may be NULL; BUG in mount - no test!! */
2434	nfs_mknod, /* OPTIONAL; may be NULL */
2435	nfs_chown, /* OPTIONAL; may be NULL */
2436	nfs_freenode, /* OPTIONAL; may be NULL; (release node_access) */
2437	nfs_mount, /* OPTIONAL; may be NULL */
2438	nfs_fsmount_me, /* OPTIONAL; may be NULL -- but this makes NO SENSE */
2439	nfs_unmount, /* OPTIONAL; may be NULL */
2440	nfs_fsunmount_me, /* OPTIONAL; may be NULL */
2441	nfs_utime, /* OPTIONAL; may be NULL */
2442	nfs_eval_link, /* OPTIONAL; may be NULL */
2443	nfs_symlink, /* OPTIONAL; may be NULL */
2444	nfs_readlink, /* OPTIONAL; may be NULL */
2445	};
2446
2447	/*****************************************
2448	File Handlers
2449
2450	NOTE: the FS generics expect a FS'
2451	evalpath_h() to switch the
2452	pathloc->handlers according
2453	to the pathloc/node's file
2454	type.
2455	We currently have 'file' and
2456	'directory' handlers and very
2457	few 'symlink' handlers.
2458
2459	The handlers for each type are
2460	implemented or #defined ZERO
2461	in a 'nfs_file_xxx',
2462	'nfs_dir_xxx', 'nfs_link_xxx'
2463	sequence below this point.
2464
2465	In some cases, a common handler,
2466	can be used for all file types.
2467	It is then simply called
2468	'nfs_xxx'.
2469	*****************************************/
2470
2471
2472	#if 0
2473	/* from rtems/libio.h for convenience */
2474	struct rtems_libio_tt {
2475	rtems_driver_name_t *driver;
2476	off_t size; /* size of file */
2477	off_t offset; /* current offset into file */
2478	uint32_t flags;
2479	rtems_filesystem_location_info_t pathinfo;
2480	Objects_Id sem;
2481	uint32_t data0; /* private to "driver" */
2482	void data1; / ... */
2483	void file_info; / used by file handlers */
2484	rtems_filesystem_file_handlers_r handlers; / type specific handlers */
2485	};
2486	#endif
2487
2488	/* stateless NFS protocol makes this trivial */
2489	static int nfs_file_open(
2490	rtems_libio_t *iop,
2491	const char *pathname,
2492	uint32_t flag,
2493	uint32_t mode
2494	)
2495	{
2496	iop->file_info = 0;
2497	return 0;
2498	}
2499
2500	/* reading directories is not stateless; we must
2501	* remember the last 'read' position, i.e.
2502	* the server 'cookie'. We do manage this information
2503	* attached to the iop->file_info.
2504	*/
2505	static int nfs_dir_open(
2506	rtems_libio_t *iop,
2507	const char *pathname,
2508	uint32_t flag,
2509	uint32_t mode
2510	)
2511	{
2512	NfsNode node = iop->pathinfo.node_access;
2513	DirInfo di;
2514
2515	/* create a readdirargs object and copy the file handle;
2516	* attach to the file_info.
2517	*/
2518
2519	di = (DirInfo) malloc(sizeof(*di));
2520	iop->file_info = di;
2521
2522	if ( !di ) {
2523	errno = ENOMEM;
2524	return -1;
2525	}
2526
2527	memcpy( &di->readdirargs.dir,
2528	&SERP_FILE(node),
2529	sizeof(di->readdirargs.dir) );
2530
2531	/* rewind cookie */
2532	memset( &di->readdirargs.cookie,
2533	0,
2534	sizeof(di->readdirargs.cookie) );
2535
2536	di->eofreached = FALSE;
2537
2538	return 0;
2539	}
2540
2541	#define nfs_link_open 0
2542
2543	static int nfs_file_close(
2544	rtems_libio_t *iop
2545	)
2546	{
2547	return 0;
2548	}
2549
2550	static int nfs_dir_close(
2551	rtems_libio_t *iop
2552	)
2553	{
2554	free(iop->file_info);
2555	iop->file_info = 0;
2556	return 0;
2557	}
2558
2559	#define nfs_link_close 0
2560
2561	static ssize_t nfs_file_read(
2562	rtems_libio_t *iop,
2563	void *buffer,
2564	size_t count
2565	)
2566	{
2567	readres rr;
2568	NfsNode node = iop->pathinfo.node_access;
2569	Nfs nfs = node->nfs;
2570
2571	if (count > NFS_MAXDATA)
2572	count = NFS_MAXDATA;
2573
2574	SERP_ARGS(node).readarg.offset = iop->offset;
2575	SERP_ARGS(node).readarg.count = count;
2576	SERP_ARGS(node).readarg.totalcount = 0xdeadbeef;
2577
2578	rr.readres_u.reply.data.data_val = buffer;
2579
2580	if ( nfscall( nfs->server,
2581	NFSPROC_READ,
2582	(xdrproc_t)xdr_readargs, &SERP_FILE(node),
2583	(xdrproc_t)xdr_readres, &rr) ) {
2584	return -1;
2585	}
2586
2587
2588	if (NFS_OK != rr.status) {
2589	rtems_set_errno_and_return_minus_one(rr.status);
2590	}
2591
2592	#if DEBUG & DEBUG_SYSCALLS
2593	fprintf(stderr,
2594	"Read %i (asked for %i) bytes from offset %i to 0x%08x\n",
2595	rr.readres_u.reply.data.data_len,
2596	count,
2597	iop->offset,
2598	rr.readres_u.reply.data.data_val);
2599	#endif
2600
2601
2602	return rr.readres_u.reply.data.data_len;
2603	}
2604
2605	/* this is called by readdir() / getdents() */
2606	static ssize_t nfs_dir_read(
2607	rtems_libio_t *iop,
2608	void *buffer,
2609	size_t count
2610	)
2611	{
2612	DirInfo di = iop->file_info;
2613	RpcUdpServer server = ((Nfs)iop->pathinfo.mt_entry->fs_info)->server;
2614
2615	if ( di->eofreached )
2616	return 0;
2617
2618	di->ptr = di->buf = buffer;
2619
2620	/* align + round down the buffer */
2621	count &= ~ (DIRENT_HEADER_SIZE - 1);
2622	di->len = count;
2623
2624	#if 0
2625	/* now estimate the number of entries we should ask for */
2626	count /= DIRENT_HEADER_SIZE + CONFIG_AVG_NAMLEN;
2627
2628	/* estimate the encoded size that might take up */
2629	count *= dirres_entry_size + CONFIG_AVG_NAMLEN;
2630	#else
2631	/* integer arithmetics are better done the other way round */
2632	count *= dirres_entry_size + CONFIG_AVG_NAMLEN;
2633	count /= DIRENT_HEADER_SIZE + CONFIG_AVG_NAMLEN;
2634	#endif
2635
2636	if (count > NFS_MAXDATA)
2637	count = NFS_MAXDATA;
2638
2639	di->readdirargs.count = count;
2640
2641	#if DEBUG & DEBUG_READDIR
2642	fprintf(stderr,
2643	"Readdir: asking for %i XDR bytes, buffer is %i\n",
2644	count, di->len);
2645	#endif
2646
2647	if ( nfscall(
2648	server,
2649	NFSPROC_READDIR,
2650	(xdrproc_t)xdr_readdirargs, &di->readdirargs,
2651	(xdrproc_t)xdr_dir_info, di) ) {
2652	return -1;
2653	}
2654
2655
2656	if (NFS_OK != di->status) {
2657	rtems_set_errno_and_return_minus_one(di->status);
2658	}
2659
2660	return (char)di->ptr - (char)buffer;
2661	}
2662
2663	#define nfs_link_read 0
2664
2665	static ssize_t nfs_file_write(
2666	rtems_libio_t *iop,
2667	const void *buffer,
2668	size_t count
2669	)
2670	{
2671	NfsNode node = iop->pathinfo.node_access;
2672	Nfs nfs = node->nfs;
2673	int e;
2674
2675	if (count > NFS_MAXDATA)
2676	count = NFS_MAXDATA;
2677
2678
2679	SERP_ARGS(node).writearg.beginoffset = 0xdeadbeef;
2680	if ( LIBIO_FLAGS_APPEND & iop->flags ) {
2681	if ( updateAttr(node, 0) ) {
2682	return -1;
2683	}
2684	SERP_ARGS(node).writearg.offset = SERP_ATTR(node).size;
2685	} else {
2686	SERP_ARGS(node).writearg.offset = iop->offset;
2687	}
2688	SERP_ARGS(node).writearg.totalcount = 0xdeadbeef;
2689	SERP_ARGS(node).writearg.data.data_len = count;
2690	SERP_ARGS(node).writearg.data.data_val = (void*)buffer;
2691
2692	/* write XDR buffer size will be chosen by nfscall based
2693	* on the PROC specifier
2694	*/
2695
2696	if ( nfscall( nfs->server,
2697	NFSPROC_WRITE,
2698	(xdrproc_t)xdr_writeargs, &SERP_FILE(node),
2699	(xdrproc_t)xdr_attrstat, &node->serporid) ) {
2700	return -1;
2701	}
2702
2703
2704	if (NFS_OK != (e=node->serporid.status) ) {
2705	/* try at least to recover the current attributes */
2706	updateAttr(node, 1 /* force */);
2707	rtems_set_errno_and_return_minus_one(e);
2708	}
2709
2710	node->age = nowSeconds();
2711
2712	return count;
2713	}
2714
2715	#define nfs_dir_write 0
2716	#define nfs_link_write 0
2717
2718	/* IOCTL is unneeded/unsupported */
2719	#ifdef DECLARE_BODY
2720	static int nfs_file_ioctl(
2721	rtems_libio_t *iop,
2722	uint32_t command,
2723	void *buffer
2724	)DECLARE_BODY
2725	#else
2726	#define nfs_file_ioctl 0
2727	#define nfs_dir_ioctl 0
2728	#define nfs_link_ioctl 0
2729	#endif
2730
2731	static int nfs_file_lseek(
2732	rtems_libio_t *iop,
2733	off_t length,
2734	int whence
2735	)
2736	{
2737	#if DEBUG & DEBUG_SYSCALLS
2738	fprintf(stderr,
2739	"lseek to %i (length %i, whence %i)\n",
2740	iop->offset,
2741	length,
2742	whence);
2743	#endif
2744	if ( SEEK_END == whence ) {
2745	/* rtems (4.6.2) libcsupport code 'lseek' uses iop->size to
2746	* compute the offset. We don't want to track the file size
2747	* by updating 'iop->size' constantly.
2748	* Since lseek is the only place using iop->size, we work
2749	* around this by tweaking the offset here...
2750	*/
2751	NfsNode node = iop->pathinfo.node_access;
2752	fattr *fa = &SERP_ATTR(node);
2753
2754	if (updateAttr(node, 0 /* only if old */)) {
2755	return -1;
2756	}
2757	iop->offset = fa->size;
2758	}
2759
2760	/* this is particularly easy :-) */
2761	return iop->offset;
2762	}
2763
2764	static int nfs_dir_lseek(
2765	rtems_libio_t *iop,
2766	off_t length,
2767	int whence
2768	)
2769	{
2770	DirInfo di = iop->file_info;
2771
2772	/* we don't support anything other than
2773	* rewinding
2774	*/
2775	if (SEEK_SET != whence \|\| 0 != length) {
2776	errno = ENOTSUP;
2777	return -1;
2778	}
2779
2780	/* rewind cookie */
2781	memset( &di->readdirargs.cookie,
2782	0,
2783	sizeof(di->readdirargs.cookie) );
2784
2785	di->eofreached = FALSE;
2786
2787	return iop->offset;
2788	}
2789
2790	#define nfs_link_lseek 0
2791
2792	#if 0 /* structure types for reference */
2793	struct fattr {
2794	ftype type;
2795	u_int mode;
2796	u_int nlink;
2797	u_int uid;
2798	u_int gid;
2799	u_int size;
2800	u_int blocksize;
2801	u_int rdev;
2802	u_int blocks;
2803	u_int fsid;
2804	u_int fileid;
2805	nfstime atime;
2806	nfstime mtime;
2807	nfstime ctime;
2808	};
2809
2810	struct stat
2811	{
2812	dev_t st_dev;
2813	ino_t st_ino;
2814	mode_t st_mode;
2815	nlink_t st_nlink;
2816	uid_t st_uid;
2817	gid_t st_gid;
2818	dev_t st_rdev;
2819	off_t st_size;
2820	/* SysV/sco doesn't have the rest... But Solaris, eabi does. */
2821	#if defined(__svr4__) && !defined(__PPC__) && !defined(__sun__)
2822	time_t st_atime;
2823	time_t st_mtime;
2824	time_t st_ctime;
2825	#else
2826	time_t st_atime;
2827	long st_spare1;
2828	time_t st_mtime;
2829	long st_spare2;
2830	time_t st_ctime;
2831	long st_spare3;
2832	long st_blksize;
2833	long st_blocks;
2834	long st_spare4[2];
2835	#endif
2836	};
2837	#endif
2838
2839	/* common for file/dir/link */
2840	static int nfs_fstat(
2841	rtems_filesystem_location_info_t *loc,
2842	struct stat *buf
2843	)
2844	{
2845	NfsNode node = loc->node_access;
2846	fattr *fa = &SERP_ATTR(node);
2847
2848	if (updateAttr(node, 0 /* only if old */)) {
2849	return -1;
2850	}
2851
2852	/* done by caller
2853	memset(buf, 0, sizeof(*buf));
2854	*/
2855
2856	/* translate */
2857
2858	/* one of the branches hopefully is optimized away */
2859	if (sizeof(ino_t) < sizeof(u_int)) {
2860	buf->st_dev = NFS_MAKE_DEV_T_INO_HACK((NfsNode)loc->node_access);
2861	} else {
2862	buf->st_dev = NFS_MAKE_DEV_T((NfsNode)loc->node_access);
2863	}
2864	buf->st_mode = fa->mode;
2865	buf->st_nlink = fa->nlink;
2866	buf->st_uid = fa->uid;
2867	buf->st_gid = fa->gid;
2868	buf->st_size = fa->size;
2869	/* Set to "preferred size" of this NFS client implementation */
2870	buf->st_blksize = nfsStBlksize ? nfsStBlksize : fa->blocksize;
2871	buf->st_rdev = fa->rdev;
2872	buf->st_blocks = fa->blocks;
2873	buf->st_ino = fa->fileid;
2874	buf->st_atime = fa->atime.seconds;
2875	buf->st_mtime = fa->mtime.seconds;
2876	buf->st_ctime = fa->ctime.seconds;
2877
2878	#if 0 /* NFS should return the modes */
2879	switch(fa->type) {
2880	default:
2881	case NFNON:
2882	case NFBAD:
2883	break;
2884
2885	case NFSOCK: buf->st_mode \|= S_IFSOCK; break;
2886	case NFFIFO: buf->st_mode \|= S_IFIFO; break;
2887	case NFREG : buf->st_mode \|= S_IFREG; break;
2888	case NFDIR : buf->st_mode \|= S_IFDIR; break;
2889	case NFBLK : buf->st_mode \|= S_IFBLK; break;
2890	case NFCHR : buf->st_mode \|= S_IFCHR; break;
2891	case NFLNK : buf->st_mode \|= S_IFLNK; break;
2892	}
2893	#endif
2894
2895	return 0;
2896	}
2897
2898	/* a helper which does the real work for
2899	* a couple of handlers (such as chmod,
2900	* ftruncate or utime)
2901	*/
2902	static int
2903	nfs_sattr(NfsNode node, sattr *arg, u_long mask)
2904	{
2905
2906	rtems_clock_time_value now;
2907	nfstime nfsnow, t;
2908	int e;
2909	u_int mode;
2910
2911	if (updateAttr(node, 0 /* only if old */))
2912	return -1;
2913
2914	rtems_clock_get(RTEMS_CLOCK_GET_TIME_VALUE, &now);
2915
2916	/* TODO: add rtems EPOCH - UNIX EPOCH seconds */
2917	nfsnow.seconds = now.seconds;
2918	nfsnow.useconds = now.microseconds;
2919
2920	/* merge permission bits into existing type bits */
2921	mode = SERP_ATTR(node).mode;
2922	if (mask & SATTR_MODE) {
2923	mode &= S_IFMT;
2924	mode \|= arg->mode & ~S_IFMT;
2925	} else {
2926	mode = -1;
2927	}
2928	SERP_ARGS(node).sattrarg.attributes.mode = mode;
2929
2930	SERP_ARGS(node).sattrarg.attributes.uid =
2931	(mask & SATTR_UID) ? arg->uid : -1;
2932
2933	SERP_ARGS(node).sattrarg.attributes.gid =
2934	(mask & SATTR_GID) ? arg->gid : -1;
2935
2936	SERP_ARGS(node).sattrarg.attributes.size =
2937	(mask & SATTR_SIZE) ? arg->size : -1;
2938
2939	if (mask & SATTR_ATIME)
2940	t = arg->atime;
2941	else if (mask & SATTR_TOUCHA)
2942	t = nfsnow;
2943	else
2944	t.seconds = t.useconds = -1;
2945	SERP_ARGS(node).sattrarg.attributes.atime = t;
2946
2947	if (mask & SATTR_ATIME)
2948	t = arg->mtime;
2949	else if (mask & SATTR_TOUCHA)
2950	t = nfsnow;
2951	else
2952	t.seconds = t.useconds = -1;
2953	SERP_ARGS(node).sattrarg.attributes.mtime = t;
2954
2955	node->serporid.status = NFS_OK;
2956
2957	if ( nfscall( node->nfs->server,
2958	NFSPROC_SETATTR,
2959	(xdrproc_t)xdr_sattrargs, &SERP_FILE(node),
2960	(xdrproc_t)xdr_attrstat, &node->serporid) ) {
2961	#if DEBUG & DEBUG_SYSCALLS
2962	fprintf(stderr,
2963	"nfs_sattr (mask 0x%08x): %s",
2964	mask,
2965	strerror(errno));
2966	#endif
2967	return -1;
2968	}
2969
2970	if (NFS_OK != (e=node->serporid.status) ) {
2971	#if DEBUG & DEBUG_SYSCALLS
2972	fprintf(stderr,"nfs_sattr: %s\n",strerror(e));
2973	#endif
2974	/* try at least to recover the current attributes */
2975	updateAttr(node, 1 /* force */);
2976	rtems_set_errno_and_return_minus_one(e);
2977	}
2978
2979	node->age = nowSeconds();
2980
2981	return 0;
2982	}
2983
2984
2985	/* common for file/dir/link */
2986	static int nfs_fchmod(
2987	rtems_filesystem_location_info_t *loc,
2988	mode_t mode
2989	)
2990	{
2991	sattr arg;
2992
2993	arg.mode = mode;
2994	return nfs_sattr(loc->node_access, &arg, SATTR_MODE);
2995
2996	}
2997
2998	/* just set the size attribute to 'length'
2999	* the server will take care of the rest :-)
3000	*/
3001	static int nfs_file_ftruncate(
3002	rtems_libio_t *iop,
3003	off_t length
3004	)
3005	{
3006	sattr arg;
3007
3008	arg.size = length;
3009	/* must not modify any other attribute; if we are not the owner
3010	* of the file or directory but only have write access changing
3011	* any attribute besides 'size' will fail...
3012	*/
3013	return nfs_sattr(iop->pathinfo.node_access,
3014	&arg,
3015	SATTR_SIZE);
3016	}
3017
3018	#define nfs_dir_ftruncate 0
3019	#define nfs_link_ftruncate 0
3020
3021	/* not implemented */
3022	#ifdef DECLARE_BODY
3023	static int nfs_file_fpathconf(
3024	rtems_libio_t *iop,
3025	int name
3026	)DECLARE_BODY
3027	#else
3028	#define nfs_file_fpathconf 0
3029	#define nfs_dir_fpathconf 0
3030	#define nfs_link_fpathconf 0
3031	#endif
3032
3033	/* unused */
3034	#ifdef DECLARE_BODY
3035	static int nfs_file_fsync(
3036	rtems_libio_t *iop
3037	)DECLARE_BODY
3038	#else
3039	#define nfs_file_fsync 0
3040	#define nfs_dir_fsync 0
3041	#define nfs_link_fsync 0
3042	#endif
3043
3044	/* unused */
3045	#ifdef DECLARE_BODY
3046	static int nfs_file_fdatasync(
3047	rtems_libio_t *iop
3048	)DECLARE_BODY
3049	#else
3050	#define nfs_file_fdatasync 0
3051	#define nfs_dir_fdatasync 0
3052	#define nfs_link_fdatasync 0
3053	#endif
3054
3055	/* unused */
3056	#ifdef DECLARE_BODY
3057	static int nfs_file_fcntl(
3058	int cmd,
3059	rtems_libio_t *iop
3060	)DECLARE_BODY
3061	#else
3062	#define nfs_file_fcntl 0
3063	#define nfs_dir_fcntl 0
3064	#define nfs_link_fcntl 0
3065	#endif
3066
3067	/* files and symlinks are removed
3068	* by the common nfs_unlink() routine.
3069	* NFS has a different NFSPROC_RMDIR
3070	* call, though...
3071	*/
3072	static int nfs_dir_rmnod(
3073	rtems_filesystem_location_info_t pathloc / IN */
3074	)
3075	{
3076	return nfs_do_unlink(pathloc, NFSPROC_RMDIR);
3077	}
3078
3079	/* the file handlers table */
3080	static
3081	struct _rtems_filesystem_file_handlers_r nfs_file_file_handlers = {
3082	nfs_file_open, /* OPTIONAL; may be NULL */
3083	nfs_file_close, /* OPTIONAL; may be NULL */
3084	nfs_file_read, /* OPTIONAL; may be NULL */
3085	nfs_file_write, /* OPTIONAL; may be NULL */
3086	nfs_file_ioctl, /* OPTIONAL; may be NULL */
3087	nfs_file_lseek, /* OPTIONAL; may be NULL */
3088	nfs_fstat, /* OPTIONAL; may be NULL */
3089	nfs_fchmod, /* OPTIONAL; may be NULL */
3090	nfs_file_ftruncate, /* OPTIONAL; may be NULL */
3091	nfs_file_fpathconf, /* OPTIONAL; may be NULL - UNUSED */
3092	nfs_file_fsync, /* OPTIONAL; may be NULL */
3093	nfs_file_fdatasync, /* OPTIONAL; may be NULL */
3094	nfs_file_fcntl, /* OPTIONAL; may be NULL */
3095	nfs_unlink, /* OPTIONAL; may be NULL */
3096	};
3097
3098	/* the directory handlers table */
3099	static
3100	struct _rtems_filesystem_file_handlers_r nfs_dir_file_handlers = {
3101	nfs_dir_open, /* OPTIONAL; may be NULL */
3102	nfs_dir_close, /* OPTIONAL; may be NULL */
3103	nfs_dir_read, /* OPTIONAL; may be NULL */
3104	nfs_dir_write, /* OPTIONAL; may be NULL */
3105	nfs_dir_ioctl, /* OPTIONAL; may be NULL */
3106	nfs_dir_lseek, /* OPTIONAL; may be NULL */
3107	nfs_fstat, /* OPTIONAL; may be NULL */
3108	nfs_fchmod, /* OPTIONAL; may be NULL */
3109	nfs_dir_ftruncate, /* OPTIONAL; may be NULL */
3110	nfs_dir_fpathconf, /* OPTIONAL; may be NULL - UNUSED */
3111	nfs_dir_fsync, /* OPTIONAL; may be NULL */
3112	nfs_dir_fdatasync, /* OPTIONAL; may be NULL */
3113	nfs_dir_fcntl, /* OPTIONAL; may be NULL */
3114	nfs_dir_rmnod, /* OPTIONAL; may be NULL */
3115	};
3116
3117	/* the link handlers table */
3118	static
3119	struct _rtems_filesystem_file_handlers_r nfs_link_file_handlers = {
3120	nfs_link_open, /* OPTIONAL; may be NULL */
3121	nfs_link_close, /* OPTIONAL; may be NULL */
3122	nfs_link_read, /* OPTIONAL; may be NULL */
3123	nfs_link_write, /* OPTIONAL; may be NULL */
3124	nfs_link_ioctl, /* OPTIONAL; may be NULL */
3125	nfs_link_lseek, /* OPTIONAL; may be NULL */
3126	nfs_fstat, /* OPTIONAL; may be NULL */
3127	nfs_fchmod, /* OPTIONAL; may be NULL */
3128	nfs_link_ftruncate, /* OPTIONAL; may be NULL */
3129	nfs_link_fpathconf, /* OPTIONAL; may be NULL - UNUSED */
3130	nfs_link_fsync, /* OPTIONAL; may be NULL */
3131	nfs_link_fdatasync, /* OPTIONAL; may be NULL */
3132	nfs_link_fcntl, /* OPTIONAL; may be NULL */
3133	nfs_unlink, /* OPTIONAL; may be NULL */
3134	};
3135
3136	/* we need a dummy driver entry table to get a
3137	* major number from the system
3138	*/
3139	static
3140	rtems_device_driver nfs_initialize(
3141	rtems_device_major_number major,
3142	rtems_device_minor_number minor,
3143	void *arg
3144	)
3145	{
3146	/* we don't really use this routine because
3147	* we cannot supply an argument (contrary
3148	* to what the 'arg' parameter suggests - it
3149	* is always set to 0 by the generics :-()
3150	* and because we don't want the user to
3151	* have to deal with the major number (which
3152	* OTOH is something WE are interested in. The
3153	* only reason for using this API was getting
3154	* a major number, after all).
3155	*
3156	* Something must be present, however, to
3157	* reserve a slot in the driver table.
3158	*/
3159	return RTEMS_SUCCESSFUL;
3160	}
3161
3162	static rtems_driver_address_table drvNfs = {
3163	nfs_initialize,
3164	0, /* open */
3165	0, /* close */
3166	0, /* read */
3167	0, /* write */
3168	0 /* control */
3169	};
3170
3171	/* Dump a list of the currently mounted NFS to a file */
3172	int
3173	nfsMountsShow(FILE *f)
3174	{
3175	char *mntpt = 0;
3176	Nfs nfs;
3177
3178	if (!f)
3179	f = stdout;
3180
3181	if ( !(mntpt=malloc(MAXPATHLEN)) ) {
3182	fprintf(stderr,"nfsMountsShow(): no memory\n");
3183	return -1;
3184	}
3185
3186	fprintf(f,"Currently Mounted NFS:\n");
3187
3188	LOCK(nfsGlob.llock);
3189
3190	for (nfs = nfsGlob.mounted_fs; nfs; nfs=nfs->next) {
3191	fprintf(f,"%s on ", nfs->mt_entry->dev);
3192	if (rtems_filesystem_resolve_location(mntpt, MAXPATHLEN, &nfs->mt_entry->mt_fs_root))
3193	fprintf(f,"<UNABLE TO LOOKUP MOUNTPOINT>\n");
3194	else
3195	fprintf(f,"%s\n",mntpt);
3196	}
3197
3198	UNLOCK(nfsGlob.llock);
3199
3200	free(mntpt);
3201	return 0;
3202	}
3203
3204	/* convenience wrapper
3205	*
3206	* NOTE: this routine calls NON-REENTRANT
3207	* gethostbyname() if the host is
3208	* not in 'dot' notation.
3209	*/
3210	int
3211	nfsMount(char uidhost, char path, char *mntpoint)
3212	{
3213	rtems_filesystem_mount_table_entry_t *mtab;
3214	struct stat st;
3215	int devl;
3216	char *host;
3217	int rval = -1;
3218	char *dev = 0;
3219
3220	if (!uidhost \|\| !path \|\| !mntpoint) {
3221	fprintf(stderr,"usage: nfsMount(""[uid.gid@]host"",""path"",""mountpoint"")\n");
3222	nfsMountsShow(stderr);
3223	return -1;
3224	}
3225
3226	if ( !(dev = malloc((devl=strlen(uidhost) + 20 + strlen(path)+1))) ) {
3227	fprintf(stderr,"nfsMount: out of memory\n");
3228	return -1;
3229	}
3230
3231	/* Try to create the mount point if nonexistent */
3232	if (stat(mntpoint, &st)) {
3233	if (ENOENT != errno) {
3234	perror("nfsMount trying to create mount point - stat failed");
3235	goto cleanup;
3236	} else if (mkdir(mntpoint,0777)) {
3237	perror("nfsMount trying to create mount point");
3238	goto cleanup;
3239	}
3240	}
3241
3242	if ( !(host=strchr(uidhost,UIDSEP)) ) {
3243	host = uidhost;
3244	} else {
3245	host++;
3246	}
3247
3248	if (isdigit(*host)) {
3249	/* avoid using gethostbyname */
3250	sprintf(dev,"%s:%s",uidhost,path);
3251	} else {
3252	struct hostent *h;
3253
3254	/* copy the uid part (hostname will be
3255	* overwritten)
3256	*/
3257	strcpy(dev, uidhost);
3258
3259	/* NOTE NOTE NOTE: gethostbyname is NOT
3260	* thread safe. This is UGLY
3261	*/
3262
3263	/* BEGIN OF NON-THREAD SAFE REGION */
3264
3265	h = gethostbyname(host);
3266
3267	if ( !h \|\|
3268	!inet_ntop( AF_INET,
3269	(struct in_addr*)h->h_addr_list[0],
3270	dev + (host - uidhost),
3271	devl - (host - uidhost) )
3272	) {
3273	fprintf(stderr,"nfsMount: host '%s' not found\n",host);
3274	goto cleanup;
3275	}
3276
3277	/* END OF NON-THREAD SAFE REGION */
3278
3279	/* append ':<path>' */
3280	strcat(dev,":");
3281	strcat(dev,path);
3282	}
3283
3284	printf("Trying to mount %s on %s\n",dev,mntpoint);
3285
3286	if (mount(&mtab,
3287	&nfs_fs_ops,
3288	RTEMS_FILESYSTEM_READ_WRITE,
3289	dev,
3290	mntpoint)) {
3291	perror("nfsMount - mount");
3292	goto cleanup;
3293	}
3294
3295	rval = 0;
3296
3297	cleanup:
3298	free(dev);
3299	return rval;
3300	}
3301
3302	/* HERE COMES A REALLY UGLY HACK */
3303
3304	/* This is stupid; it is _very_ hard to find the path
3305	* leading to a rtems_filesystem_location_info_t node :-(
3306	* The only easy way is making the location the current
3307	* directory and issue a getcwd().
3308	* However, since we don't want to tamper with the
3309	* current directory, we must create a separate
3310	* task to do the job for us - sigh.
3311	*/
3312
3313	typedef struct ResolvePathArgRec_ {
3314	rtems_filesystem_location_info_t loc; / IN: location to resolve */
3315	char buf; / IN/OUT: buffer where to put the path */
3316	int len; /* IN: buffer length */
3317	rtems_id sync; /* IN: synchronization */
3318	rtems_status_code status; /* OUT: result */
3319	} ResolvePathArgRec, *ResolvePathArg;
3320
3321	static void
3322	resolve_path(rtems_task_argument arg)
3323	{
3324	ResolvePathArg rpa = (ResolvePathArg)arg;
3325	rtems_filesystem_location_info_t old;
3326
3327	/* IMPORTANT: let the helper task have its own libio environment (i.e. cwd) */
3328	if (RTEMS_SUCCESSFUL == (rpa->status = rtems_libio_set_private_env())) {
3329
3330	old = rtems_filesystem_current;
3331
3332	rtems_filesystem_current = *(rpa->loc);
3333
3334	if ( !getcwd(rpa->buf, rpa->len) )
3335	rpa->status = RTEMS_UNSATISFIED;
3336
3337	/* must restore the cwd because 'freenode' will be called on it */
3338	rtems_filesystem_current = old;
3339	}
3340	rtems_semaphore_release(rpa->sync);
3341	rtems_task_delete(RTEMS_SELF);
3342	}
3343
3344
3345	/* a utility routine to find the path leading to a
3346	* rtems_filesystem_location_info_t node
3347	*
3348	* INPUT: 'loc' and a buffer 'buf' (length 'len') to hold the
3349	* path.
3350	* OUTPUT: path copied into 'buf'
3351	*
3352	* RETURNS: 0 on success, RTEMS error code on error.
3353	*/
3354	rtems_status_code
3355	rtems_filesystem_resolve_location(char buf, int len, rtems_filesystem_location_info_t loc)
3356	{
3357	ResolvePathArgRec arg;
3358	rtems_id tid = 0;
3359	rtems_task_priority pri;
3360	rtems_status_code status;
3361
3362	arg.loc = loc;
3363	arg.buf = buf;
3364	arg.len = len;
3365	arg.sync = 0;
3366
3367	status = rtems_semaphore_create(
3368	rtems_build_name('r','e','s','s'),
3369	0,
3370	RTEMS_SIMPLE_BINARY_SEMAPHORE,
3371	0,
3372	&arg.sync);
3373
3374	if (RTEMS_SUCCESSFUL != status)
3375	goto cleanup;
3376
3377	rtems_task_set_priority(RTEMS_SELF, RTEMS_CURRENT_PRIORITY, &pri);
3378
3379	status = rtems_task_create(
3380	rtems_build_name('r','e','s','s'),
3381	pri,
3382	RTEMS_MINIMUM_STACK_SIZE + 50000,
3383	RTEMS_DEFAULT_MODES,
3384	RTEMS_DEFAULT_ATTRIBUTES,
3385	&tid);
3386
3387	if (RTEMS_SUCCESSFUL != status)
3388	goto cleanup;
3389
3390	status = rtems_task_start(tid, resolve_path, (rtems_task_argument)&arg);
3391
3392	if (RTEMS_SUCCESSFUL != status) {
3393	rtems_task_delete(tid);
3394	goto cleanup;
3395	}
3396
3397
3398	/* synchronize with the helper task */
3399	rtems_semaphore_obtain(arg.sync, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
3400
3401	status = arg.status;
3402
3403	cleanup:
3404	if (arg.sync)
3405	rtems_semaphore_delete(arg.sync);
3406
3407	return status;
3408	}
3409
3410	int
3411	nfsSetTimeout(uint32_t timeout_ms)
3412	{
3413	rtems_interrupt_level k;
3414	uint32_t s,us;
3415
3416	if ( timeout_ms > 100000 ) {
3417	/* out of range */
3418	return -1;
3419	}
3420
3421	s = timeout_ms/1000;
3422	us = (timeout_ms % 1000) * 1000;
3423
3424	rtems_interrupt_disable(k);
3425	_nfscalltimeout.tv_sec = s;
3426	_nfscalltimeout.tv_usec = us;
3427	rtems_interrupt_enable(k);
3428
3429	return 0;
3430	}
3431
3432	uint32_t
3433	nfsGetTimeout()
3434	{
3435	rtems_interrupt_level k;
3436	uint32_t s,us;
3437	rtems_interrupt_disable(k);
3438	s = _nfscalltimeout.tv_sec;
3439	us = _nfscalltimeout.tv_usec;
3440	rtems_interrupt_enable(k);
3441	return s*1000 + us/1000;
3442	}

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