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nfs.c @ 07d6fd5

4.104.115

Last change on this file since 07d6fd5 was 07d6fd5, checked in by Chris Johns <chrisj@…>, on 04/29/09 at 08:31:27

2009-04-29 Chris Johns <chrisj@…>

libcsupport/include/rtems/libio.h: Add rtems_off64_t for internal use. Update the internal off_t to the 64bit offset.

libnetworking/lib/ftpfs.c, libnetworking/lib/tftpDriver.c, libfs/src/nfsclient/src/nfs.c, libfs/src/imfs/imfs_fifo.c, libfs/src/imfs/memfile.c, libfs/src/imfs/imfs_directory.c, libfs/src/imfs/imfs.h, libfs/src/imfs/deviceio.c: Change off_t to rtems_off64_t.

libmisc/shell/main_msdosfmt.c: Add an info level so the format code can tell the user what is happening. Add more options to control the format configuration.

libfs/src/dosfs/msdos_format.c: Add a print function to display the format progress and print statements. Select a better default cluster size depending on the size of the disk. This lowers the size of the FAT on large disks. Read and maintain the MRB partition information.

libfs/src/dosfs/dosfs.h, libfs/src/dosfs/fat.h, libfs/src/dosfs/fat_file.c, libfs/src/dosfs/fat_file.h, libfs/src/dosfs/msdos.h, libfs/src/dosfs/msdos_conv.c, libfs/src/dosfs/msdos_create.c, libfs/src/dosfs/msdos_file.c, libfs/src/dosfs/msdos_handlers_dir.c, libfs/src/dosfs/msdos_handlers_file.c, libfs/src/dosfs/msdos_init.c, libfs/src/dosfs/msdos_initsupp.c, libfs/src/dosfs/msdos_misc.c, libfs/src/dosfs/msdos_mknod.c: Add long file name support. Change off_t to rtems_off64_t.

Property mode set to 100644

File size: 80.3 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	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	STATIC int nfs_do_evalpath(
1357	const char pathname, / IN */
1358	void *arg,
1359	rtems_filesystem_location_info_t pathloc, / IN/OUT */
1360	int forMake
1361	)
1362	{
1363	char del = 0, part;
1364	int e = 0;
1365	NfsNode node = pathloc->node_access;
1366	char *p = malloc(MAXPATHLEN+1);
1367	Nfs nfs = (Nfs)pathloc->mt_entry->fs_info;
1368	RpcUdpServer server = nfs->server;
1369	unsigned long flags;
1370	#if DEBUG & DEBUG_COUNT_NODES
1371	unsigned long niu,siu;
1372	#endif
1373
1374	if ( !p ) {
1375	e = ENOMEM;
1376	goto cleanup;
1377	}
1378	strcpy(p, pathname);
1379
1380	LOCK(nfsGlob.lock);
1381	node = nfsNodeClone(node);
1382	UNLOCK(nfsGlob.lock);
1383
1384	/* from here on, the NFS is protected from being unmounted
1385	* since the node refcount is > 1
1386	*/
1387
1388	/* clone the node */
1389	if ( !node ) {
1390	/* nodeClone sets errno */
1391	pathloc->node_access = 0;
1392	if ( ! (e = errno) ) {
1393	/* if we have no node, e must not be zero! */
1394	e = ENOMEM;
1395	}
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	rtems_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	nfs = nfsCreate(nfsServer);
1979	assert( nfs );
1980	nfsServer = 0;
1981
1982	nfs->uid = uid;
1983	nfs->gid = gid;
1984
1985	/* that seemed to work - we now create the root node
1986	* and we also must obtain the root node attributes
1987	*/
1988	rootNode = nfsNodeCreate(nfs, &fhstat.fhstatus_u.fhs_fhandle);
1989	assert( rootNode );
1990
1991	if ( updateAttr(rootNode, 1 /* force */) ) {
1992	e = errno;
1993	goto cleanup;
1994	}
1995
1996	/* looks good so far */
1997
1998	mt_entry->mt_fs_root.node_access = rootNode;
1999
2000	rootNode = 0;
2001
2002	mt_entry->mt_fs_root.ops = &nfs_fs_ops;
2003	mt_entry->mt_fs_root.handlers = &nfs_dir_file_handlers;
2004	mt_entry->pathconf_limits_and_options = nfs_limits_and_options;
2005
2006	LOCK(nfsGlob.llock);
2007	nfsGlob.num_mounted_fs++;
2008	/* allocate a new ID for this FS */
2009	nfs->id = nfsGlob.fs_ids++;
2010	UNLOCK(nfsGlob.llock);
2011
2012	mt_entry->fs_info = nfs;
2013	nfs->mt_entry = mt_entry;
2014	nfs = 0;
2015
2016	e = 0;
2017
2018	cleanup:
2019	if (nfs)
2020	nfsDestroy(nfs);
2021	if (nfsServer)
2022	rpcUdpServerDestroy(nfsServer);
2023	if (rootNode)
2024	nfsNodeDestroy(rootNode);
2025	if (e)
2026	rtems_set_errno_and_return_minus_one(e);
2027	else
2028	return 0;
2029	}
2030
2031	/* This op is called when they try to unmount THIS fs */
2032	STATIC int nfs_fsunmount_me(
2033	rtems_filesystem_mount_table_entry_t mt_entry / in */
2034	)
2035	{
2036	enum clnt_stat stat;
2037	struct sockaddr_in saddr;
2038	char *path = mt_entry->dev;
2039	int nodesInUse;
2040	u_long uid,gid;
2041	int status;
2042
2043	LOCK(nfsGlob.llock);
2044	nodesInUse = ((Nfs)mt_entry->fs_info)->nodesInUse;
2045
2046	if (nodesInUse > 1 /* one ref to the root node used by us */) {
2047	UNLOCK(nfsGlob.llock);
2048	fprintf(stderr,
2049	"Refuse to unmount; there are still %i nodes in use (1 used by us)\n",
2050	nodesInUse);
2051	rtems_set_errno_and_return_minus_one(EBUSY);
2052	}
2053
2054	status = buildIpAddr(&uid, &gid, 0, &saddr, &path);
2055	assert( !status );
2056
2057	stat = mntcall( &saddr,
2058	MOUNTPROC_UMNT,
2059	(xdrproc_t)xdr_dirpath, &path,
2060	(xdrproc_t)xdr_void, 0,
2061	uid,
2062	gid
2063	);
2064
2065	if (stat) {
2066	UNLOCK(nfsGlob.llock);
2067	fprintf(stderr,"NFS UMOUNT -- %s\n", clnt_sperrno(stat));
2068	errno = EIO;
2069	return -1;
2070	}
2071
2072	nfsNodeDestroy(mt_entry->mt_fs_root.node_access);
2073	mt_entry->mt_fs_root.node_access = 0;
2074
2075	nfsDestroy(mt_entry->fs_info);
2076	mt_entry->fs_info = 0;
2077
2078	nfsGlob.num_mounted_fs--;
2079	UNLOCK(nfsGlob.llock);
2080
2081	return 0;
2082	}
2083
2084	/* OPTIONAL; may be NULL - BUT: CAUTION; mount() doesn't check
2085	* for this handler to be present - a fs bug
2086	* //NOTE: (10/25/2002) patch submitted and probably applied
2087	*/
2088	static rtems_filesystem_node_types_t nfs_node_type(
2089	rtems_filesystem_location_info_t pathloc / in */
2090	)
2091	{
2092	NfsNode node = pathloc->node_access;
2093
2094	if (updateAttr(node, 0 /* only if old */))
2095	return -1;
2096
2097	switch( SERP_ATTR(node).type ) {
2098	default:
2099	/* rtems has no value for 'unknown';
2100	*/
2101	case NFNON:
2102	case NFSOCK:
2103	case NFBAD:
2104	case NFFIFO:
2105	break;
2106
2107
2108	case NFREG: return RTEMS_FILESYSTEM_MEMORY_FILE;
2109	case NFDIR: return RTEMS_FILESYSTEM_DIRECTORY;
2110
2111	case NFBLK:
2112	case NFCHR: return RTEMS_FILESYSTEM_DEVICE;
2113
2114	case NFLNK: return RTEMS_FILESYSTEM_SYM_LINK;
2115	}
2116	return -1;
2117	}
2118
2119	static int nfs_mknod(
2120	const char path, / IN */
2121	mode_t mode, /* IN */
2122	dev_t dev, /* IN */
2123	rtems_filesystem_location_info_t pathloc / IN/OUT */
2124	)
2125	{
2126	rtems_clock_time_value now;
2127	diropres res;
2128	NfsNode node = pathloc->node_access;
2129	mode_t type = S_IFMT & mode;
2130
2131	if (type != S_IFDIR && type != S_IFREG)
2132	rtems_set_errno_and_return_minus_one(ENOTSUP);
2133
2134	#if DEBUG & DEBUG_SYSCALLS
2135	fprintf(stderr,"nfs_mknod: creating %s\n", path);
2136	#endif
2137
2138	rtems_clock_get(RTEMS_CLOCK_GET_TIME_VALUE, &now);
2139
2140	SERP_ARGS(node).createarg.name = (filename)path;
2141	SERP_ARGS(node).createarg.attributes.mode = mode;
2142	/* TODO: either use our uid or use the Nfs credentials */
2143	SERP_ARGS(node).createarg.attributes.uid = 0;
2144	SERP_ARGS(node).createarg.attributes.gid = 0;
2145	SERP_ARGS(node).createarg.attributes.size = 0;
2146	SERP_ARGS(node).createarg.attributes.atime.seconds = now.seconds;
2147	SERP_ARGS(node).createarg.attributes.atime.useconds = now.microseconds;
2148	SERP_ARGS(node).createarg.attributes.mtime.seconds = now.seconds;
2149	SERP_ARGS(node).createarg.attributes.mtime.useconds = now.microseconds;
2150
2151	if ( nfscall( node->nfs->server,
2152	NFSPROC_CREATE,
2153	(xdrproc_t)xdr_createargs, &SERP_FILE(node),
2154	(xdrproc_t)xdr_diropres, &res)
2155	\|\| (NFS_OK != (errno = res.status)) ) {
2156	#if DEBUG & DEBUG_SYSCALLS
2157	perror("nfs_mknod");
2158	#endif
2159	return -1;
2160	}
2161
2162	return 0;
2163	}
2164
2165	static int nfs_utime(
2166	rtems_filesystem_location_info_t pathloc, / IN */
2167	time_t actime, /* IN */
2168	time_t modtime /* IN */
2169	)
2170	{
2171	sattr arg;
2172
2173	/* TODO: add rtems EPOCH - UNIX EPOCH seconds */
2174	arg.atime.seconds = actime;
2175	arg.atime.useconds = 0;
2176	arg.mtime.seconds = modtime;
2177	arg.mtime.useconds = 0;
2178
2179	return nfs_sattr(pathloc->node_access, &arg, SATTR_ATIME \| SATTR_MTIME);
2180	}
2181
2182	static int nfs_symlink(
2183	rtems_filesystem_location_info_t loc, / IN */
2184	const char link_name, / IN */
2185	const char *node_name
2186	)
2187	{
2188	rtems_clock_time_value now;
2189	nfsstat status;
2190	NfsNode node = loc->node_access;
2191
2192
2193	#if DEBUG & DEBUG_SYSCALLS
2194	fprintf(stderr,"nfs_symlink: creating %s -> %s\n", link_name, node_name);
2195	#endif
2196
2197	rtems_clock_get(RTEMS_CLOCK_GET_TIME_VALUE, &now);
2198
2199	SERP_ARGS(node).symlinkarg.name = (filename)link_name;
2200	SERP_ARGS(node).symlinkarg.to = (nfspath) node_name;
2201
2202	SERP_ARGS(node).symlinkarg.attributes.mode = S_IFLNK \| S_IRWXU \| S_IRWXG \| S_IRWXO;
2203	/* TODO */
2204	SERP_ARGS(node).symlinkarg.attributes.uid = 0;
2205	SERP_ARGS(node).symlinkarg.attributes.gid = 0;
2206	SERP_ARGS(node).symlinkarg.attributes.size = 0;
2207	SERP_ARGS(node).symlinkarg.attributes.atime.seconds = now.seconds;
2208	SERP_ARGS(node).symlinkarg.attributes.atime.useconds = now.microseconds;
2209	SERP_ARGS(node).symlinkarg.attributes.mtime.seconds = now.seconds;
2210	SERP_ARGS(node).symlinkarg.attributes.mtime.useconds = now.microseconds;
2211
2212	if ( nfscall( node->nfs->server,
2213	NFSPROC_SYMLINK,
2214	(xdrproc_t)xdr_symlinkargs, &SERP_FILE(node),
2215	(xdrproc_t)xdr_nfsstat, &status)
2216	\|\| (NFS_OK != (errno = status)) ) {
2217	#if DEBUG & DEBUG_SYSCALLS
2218	perror("nfs_symlink");
2219	#endif
2220	return -1;
2221	}
2222
2223	return 0;
2224	}
2225
2226	static int nfs_do_readlink(
2227	rtems_filesystem_location_info_t loc, / IN */
2228	strbuf psbuf / IN/OUT */
2229	)
2230	{
2231	NfsNode node = loc->node_access;
2232	Nfs nfs = node->nfs;
2233	readlinkres_strbuf rr;
2234	int wasAlloced;
2235	int rval;
2236
2237	rr.strbuf = *psbuf;
2238
2239	wasAlloced = (0 == psbuf->buf);
2240
2241	if ( (rval = nfscall(nfs->server,
2242	NFSPROC_READLINK,
2243	(xdrproc_t)xdr_nfs_fh, &SERP_FILE(node),
2244	(xdrproc_t)xdr_readlinkres_strbuf, &rr)) ) {
2245	if (wasAlloced)
2246	xdr_free( (xdrproc_t)xdr_strbuf, (caddr_t)&rr.strbuf );
2247	}
2248
2249
2250	if (NFS_OK != rr.status) {
2251	if (wasAlloced)
2252	xdr_free( (xdrproc_t)xdr_strbuf, (caddr_t)&rr.strbuf );
2253	rtems_set_errno_and_return_minus_one(rr.status);
2254	}
2255
2256	*psbuf = rr.strbuf;
2257
2258	return 0;
2259	}
2260
2261	static int nfs_readlink(
2262	rtems_filesystem_location_info_t loc, / IN */
2263	char buf, / OUT */
2264	size_t len
2265	)
2266	{
2267	strbuf sbuf;
2268	sbuf.buf = buf;
2269	sbuf.max = len;
2270
2271	return nfs_do_readlink(loc, &sbuf);
2272	}
2273
2274	/* The semantics of this routine are:
2275	*
2276	* The caller submits a valid pathloc, i.e. it has
2277	* an NfsNode attached to node_access.
2278	* On return, pathloc points to the target node which
2279	* may or may not be an NFS node.
2280	* Hence, the original NFS node is released in either
2281	* case:
2282	* - link evaluation fails; pathloc points to no valid node
2283	* - link evaluation success; pathloc points to a new valid
2284	* node. If it's an NFS node, a new NfsNode will be attached
2285	* to node_access...
2286	*/
2287
2288	#define LINKVAL_BUFLEN (MAXPATHLEN+1)
2289	#define RVAL_ERR_BUT_DONT_FREENODE (-1)
2290	#define RVAL_ERR_AND_DO_FREENODE ( 1)
2291	#define RVAL_OK ( 0)
2292
2293	static int nfs_eval_link(
2294	rtems_filesystem_location_info_t pathloc, / IN/OUT */
2295	int flags /* IN */
2296	)
2297	{
2298	rtems_filesystem_node_types_t type;
2299	char *buf = malloc(LINKVAL_BUFLEN);
2300	int rval = RVAL_ERR_AND_DO_FREENODE;
2301
2302	if (!buf) {
2303	errno = ENOMEM;
2304	goto cleanup;
2305	}
2306
2307	/* in this loop, we must not use NFS specific ops as we might
2308	* step out of our FS during the process...
2309	* This algorithm should actually be performed by the
2310	* generic's evaluate_path routine :-(
2311	*
2312	* Unfortunately, there is no way of finding the
2313	* directory node who contains 'pathloc', however :-(
2314	*/
2315	do {
2316	/* assume the generics have verified 'pathloc' to be
2317	* a link...
2318	*/
2319	if ( !pathloc->ops->readlink_h ) {
2320	errno = ENOTSUP;
2321	goto cleanup;
2322	}
2323
2324	if ( pathloc->ops->readlink_h(pathloc, buf, LINKVAL_BUFLEN) ) {
2325	goto cleanup;
2326	}
2327
2328	#if DEBUG & DEBUG_EVALPATH
2329	fprintf(stderr, "link value is '%s'\n", buf);
2330	#endif
2331
2332	/* is the link value an absolute path ? */
2333	if ( DELIM != *buf ) {
2334	/* NO; a relative path */
2335
2336	/* we must backup to the link's directory - we
2337	* know only how to do that for NFS, however.
2338	* In this special case, we can avoid recursion.
2339	* Otherwise (i.e. if the link is on another FS),
2340	* we must step into its eval_link_h().
2341	*/
2342	if (locIsNfs(pathloc)) {
2343	NfsNode node = pathloc->node_access;
2344	int err;
2345
2346	memcpy( &SERP_FILE(node),
2347	&node->args.dir,
2348	sizeof(node->args.dir) );
2349
2350	if (updateAttr(node, 1 /* force */))
2351	goto cleanup;
2352
2353	if (SERP_ATTR(node).type != NFDIR) {
2354	errno = ENOTDIR;
2355	goto cleanup;
2356	}
2357
2358	pathloc->handlers = &nfs_dir_file_handlers;
2359
2360	err = nfs_evalpath(buf, flags, pathloc);
2361
2362	/* according to its semantics,
2363	* nfs_evalpath cloned the node attached
2364	* to pathloc. Hence we have to
2365	* release the old one (referring to
2366	* the link; the new clone has been
2367	* updated and refers to the link _value_).
2368	*/
2369	nfsNodeDestroy(node);
2370
2371	if (err) {
2372	/* nfs_evalpath has set errno;
2373	* pathloc->node_access has no
2374	* valid node attached in this case
2375	*/
2376	rval = RVAL_ERR_BUT_DONT_FREENODE;
2377	goto cleanup;
2378	}
2379
2380	} else {
2381	if ( ! pathloc->ops->eval_link_h ) {
2382	errno = ENOTSUP;
2383	goto cleanup;
2384	}
2385	if (!pathloc->ops->eval_link_h(pathloc, flags)) {
2386	/* FS is responsible for freeing its pathloc->node_access
2387	* if necessary
2388	*/
2389	rval = RVAL_ERR_BUT_DONT_FREENODE;
2390	goto cleanup;
2391	}
2392	}
2393	} else {
2394	/* link points to an absolute path '/xxx' */
2395
2396	/* release this node; filesystem_evaluate_path() will
2397	* lookup a new one.
2398	*/
2399	rtems_filesystem_freenode(pathloc);
2400
2401	if (rtems_filesystem_evaluate_path(buf, flags, pathloc, 1)) {
2402	/* If evalpath fails then there is no valid node
2403	* attached to pathloc; hence we must not attempt
2404	* to free the node
2405	*/
2406	rval = RVAL_ERR_BUT_DONT_FREENODE;
2407	goto cleanup;
2408	}
2409	}
2410
2411	if ( !pathloc->ops->node_type_h ) {
2412	errno = ENOTSUP;
2413	goto cleanup;
2414	}
2415
2416	type = pathloc->ops->node_type_h(pathloc);
2417
2418
2419	/* I dont know what to do about hard links */
2420	} while ( RTEMS_FILESYSTEM_SYM_LINK == type );
2421
2422	rval = RVAL_OK;
2423
2424	cleanup:
2425
2426	free(buf);
2427
2428	if (RVAL_ERR_AND_DO_FREENODE == rval) {
2429	rtems_filesystem_freenode(pathloc);
2430	return -1;
2431	}
2432
2433	return rval;
2434	}
2435
2436
2437	struct _rtems_filesystem_operations_table nfs_fs_ops = {
2438	nfs_evalpath, /* MANDATORY */
2439	nfs_evalformake, /* MANDATORY; may set errno=ENOSYS and return -1 */
2440	nfs_link, /* OPTIONAL; may be NULL */
2441	nfs_unlink, /* OPTIONAL; may be NULL */
2442	nfs_node_type, /* OPTIONAL; may be NULL; BUG in mount - no test!! */
2443	nfs_mknod, /* OPTIONAL; may be NULL */
2444	nfs_chown, /* OPTIONAL; may be NULL */
2445	nfs_freenode, /* OPTIONAL; may be NULL; (release node_access) */
2446	nfs_mount, /* OPTIONAL; may be NULL */
2447	nfs_fsmount_me, /* OPTIONAL; may be NULL -- but this makes NO SENSE */
2448	nfs_unmount, /* OPTIONAL; may be NULL */
2449	nfs_fsunmount_me, /* OPTIONAL; may be NULL */
2450	nfs_utime, /* OPTIONAL; may be NULL */
2451	nfs_eval_link, /* OPTIONAL; may be NULL */
2452	nfs_symlink, /* OPTIONAL; may be NULL */
2453	nfs_readlink, /* OPTIONAL; may be NULL */
2454	};
2455
2456	/*****************************************
2457	File Handlers
2458
2459	NOTE: the FS generics expect a FS'
2460	evalpath_h() to switch the
2461	pathloc->handlers according
2462	to the pathloc/node's file
2463	type.
2464	We currently have 'file' and
2465	'directory' handlers and very
2466	few 'symlink' handlers.
2467
2468	The handlers for each type are
2469	implemented or #defined ZERO
2470	in a 'nfs_file_xxx',
2471	'nfs_dir_xxx', 'nfs_link_xxx'
2472	sequence below this point.
2473
2474	In some cases, a common handler,
2475	can be used for all file types.
2476	It is then simply called
2477	'nfs_xxx'.
2478	*****************************************/
2479
2480
2481	#if 0
2482	/* from rtems/libio.h for convenience */
2483	struct rtems_libio_tt {
2484	rtems_driver_name_t *driver;
2485	off_t size; /* size of file */
2486	off_t offset; /* current offset into file */
2487	uint32_t flags;
2488	rtems_filesystem_location_info_t pathinfo;
2489	Objects_Id sem;
2490	uint32_t data0; /* private to "driver" */
2491	void data1; / ... */
2492	void file_info; / used by file handlers */
2493	rtems_filesystem_file_handlers_r handlers; / type specific handlers */
2494	};
2495	#endif
2496
2497	/* stateless NFS protocol makes this trivial */
2498	static int nfs_file_open(
2499	rtems_libio_t *iop,
2500	const char *pathname,
2501	uint32_t flag,
2502	uint32_t mode
2503	)
2504	{
2505	iop->file_info = 0;
2506	return 0;
2507	}
2508
2509	/* reading directories is not stateless; we must
2510	* remember the last 'read' position, i.e.
2511	* the server 'cookie'. We do manage this information
2512	* attached to the iop->file_info.
2513	*/
2514	static int nfs_dir_open(
2515	rtems_libio_t *iop,
2516	const char *pathname,
2517	uint32_t flag,
2518	uint32_t mode
2519	)
2520	{
2521	NfsNode node = iop->pathinfo.node_access;
2522	DirInfo di;
2523
2524	/* create a readdirargs object and copy the file handle;
2525	* attach to the file_info.
2526	*/
2527
2528	di = (DirInfo) malloc(sizeof(*di));
2529	iop->file_info = di;
2530
2531	if ( !di ) {
2532	errno = ENOMEM;
2533	return -1;
2534	}
2535
2536	memcpy( &di->readdirargs.dir,
2537	&SERP_FILE(node),
2538	sizeof(di->readdirargs.dir) );
2539
2540	/* rewind cookie */
2541	memset( &di->readdirargs.cookie,
2542	0,
2543	sizeof(di->readdirargs.cookie) );
2544
2545	di->eofreached = FALSE;
2546
2547	return 0;
2548	}
2549
2550	#define nfs_link_open 0
2551
2552	static int nfs_file_close(
2553	rtems_libio_t *iop
2554	)
2555	{
2556	return 0;
2557	}
2558
2559	static int nfs_dir_close(
2560	rtems_libio_t *iop
2561	)
2562	{
2563	free(iop->file_info);
2564	iop->file_info = 0;
2565	return 0;
2566	}
2567
2568	#define nfs_link_close 0
2569
2570	static ssize_t nfs_file_read(
2571	rtems_libio_t *iop,
2572	void *buffer,
2573	size_t count
2574	)
2575	{
2576	readres rr;
2577	NfsNode node = iop->pathinfo.node_access;
2578	Nfs nfs = node->nfs;
2579
2580	if (count > NFS_MAXDATA)
2581	count = NFS_MAXDATA;
2582
2583	SERP_ARGS(node).readarg.offset = iop->offset;
2584	SERP_ARGS(node).readarg.count = count;
2585	SERP_ARGS(node).readarg.totalcount = 0xdeadbeef;
2586
2587	rr.readres_u.reply.data.data_val = buffer;
2588
2589	if ( nfscall( nfs->server,
2590	NFSPROC_READ,
2591	(xdrproc_t)xdr_readargs, &SERP_FILE(node),
2592	(xdrproc_t)xdr_readres, &rr) ) {
2593	return -1;
2594	}
2595
2596
2597	if (NFS_OK != rr.status) {
2598	rtems_set_errno_and_return_minus_one(rr.status);
2599	}
2600
2601	#if DEBUG & DEBUG_SYSCALLS
2602	fprintf(stderr,
2603	"Read %i (asked for %i) bytes from offset %i to 0x%08x\n",
2604	rr.readres_u.reply.data.data_len,
2605	count,
2606	iop->offset,
2607	rr.readres_u.reply.data.data_val);
2608	#endif
2609
2610
2611	return rr.readres_u.reply.data.data_len;
2612	}
2613
2614	/* this is called by readdir() / getdents() */
2615	static ssize_t nfs_dir_read(
2616	rtems_libio_t *iop,
2617	void *buffer,
2618	size_t count
2619	)
2620	{
2621	DirInfo di = iop->file_info;
2622	RpcUdpServer server = ((Nfs)iop->pathinfo.mt_entry->fs_info)->server;
2623
2624	if ( di->eofreached )
2625	return 0;
2626
2627	di->ptr = di->buf = buffer;
2628
2629	/* align + round down the buffer */
2630	count &= ~ (DIRENT_HEADER_SIZE - 1);
2631	di->len = count;
2632
2633	#if 0
2634	/* now estimate the number of entries we should ask for */
2635	count /= DIRENT_HEADER_SIZE + CONFIG_AVG_NAMLEN;
2636
2637	/* estimate the encoded size that might take up */
2638	count *= dirres_entry_size + CONFIG_AVG_NAMLEN;
2639	#else
2640	/* integer arithmetics are better done the other way round */
2641	count *= dirres_entry_size + CONFIG_AVG_NAMLEN;
2642	count /= DIRENT_HEADER_SIZE + CONFIG_AVG_NAMLEN;
2643	#endif
2644
2645	if (count > NFS_MAXDATA)
2646	count = NFS_MAXDATA;
2647
2648	di->readdirargs.count = count;
2649
2650	#if DEBUG & DEBUG_READDIR
2651	fprintf(stderr,
2652	"Readdir: asking for %i XDR bytes, buffer is %i\n",
2653	count, di->len);
2654	#endif
2655
2656	if ( nfscall(
2657	server,
2658	NFSPROC_READDIR,
2659	(xdrproc_t)xdr_readdirargs, &di->readdirargs,
2660	(xdrproc_t)xdr_dir_info, di) ) {
2661	return -1;
2662	}
2663
2664
2665	if (NFS_OK != di->status) {
2666	rtems_set_errno_and_return_minus_one(di->status);
2667	}
2668
2669	return (char)di->ptr - (char)buffer;
2670	}
2671
2672	#define nfs_link_read 0
2673
2674	static ssize_t nfs_file_write(
2675	rtems_libio_t *iop,
2676	const void *buffer,
2677	size_t count
2678	)
2679	{
2680	NfsNode node = iop->pathinfo.node_access;
2681	Nfs nfs = node->nfs;
2682	int e;
2683
2684	if (count > NFS_MAXDATA)
2685	count = NFS_MAXDATA;
2686
2687
2688	SERP_ARGS(node).writearg.beginoffset = 0xdeadbeef;
2689	if ( LIBIO_FLAGS_APPEND & iop->flags ) {
2690	if ( updateAttr(node, 0) ) {
2691	return -1;
2692	}
2693	SERP_ARGS(node).writearg.offset = SERP_ATTR(node).size;
2694	} else {
2695	SERP_ARGS(node).writearg.offset = iop->offset;
2696	}
2697	SERP_ARGS(node).writearg.totalcount = 0xdeadbeef;
2698	SERP_ARGS(node).writearg.data.data_len = count;
2699	SERP_ARGS(node).writearg.data.data_val = (void*)buffer;
2700
2701	/* write XDR buffer size will be chosen by nfscall based
2702	* on the PROC specifier
2703	*/
2704
2705	if ( nfscall( nfs->server,
2706	NFSPROC_WRITE,
2707	(xdrproc_t)xdr_writeargs, &SERP_FILE(node),
2708	(xdrproc_t)xdr_attrstat, &node->serporid) ) {
2709	return -1;
2710	}
2711
2712
2713	if (NFS_OK != (e=node->serporid.status) ) {
2714	/* try at least to recover the current attributes */
2715	updateAttr(node, 1 /* force */);
2716	rtems_set_errno_and_return_minus_one(e);
2717	}
2718
2719	node->age = nowSeconds();
2720
2721	return count;
2722	}
2723
2724	#define nfs_dir_write 0
2725	#define nfs_link_write 0
2726
2727	/* IOCTL is unneeded/unsupported */
2728	#ifdef DECLARE_BODY
2729	static int nfs_file_ioctl(
2730	rtems_libio_t *iop,
2731	uint32_t command,
2732	void *buffer
2733	)DECLARE_BODY
2734	#else
2735	#define nfs_file_ioctl 0
2736	#define nfs_dir_ioctl 0
2737	#define nfs_link_ioctl 0
2738	#endif
2739
2740	static rtems_off64_t nfs_file_lseek(
2741	rtems_libio_t *iop,
2742	rtems_off64_t length,
2743	int whence
2744	)
2745	{
2746	#if DEBUG & DEBUG_SYSCALLS
2747	fprintf(stderr,
2748	"lseek to %i (length %i, whence %i)\n",
2749	iop->offset,
2750	length,
2751	whence);
2752	#endif
2753	if ( SEEK_END == whence ) {
2754	/* rtems (4.6.2) libcsupport code 'lseek' uses iop->size to
2755	* compute the offset. We don't want to track the file size
2756	* by updating 'iop->size' constantly.
2757	* Since lseek is the only place using iop->size, we work
2758	* around this by tweaking the offset here...
2759	*/
2760	NfsNode node = iop->pathinfo.node_access;
2761	fattr *fa = &SERP_ATTR(node);
2762
2763	if (updateAttr(node, 0 /* only if old */)) {
2764	return -1;
2765	}
2766	iop->offset = fa->size;
2767	}
2768
2769	/* this is particularly easy :-) */
2770	return iop->offset;
2771	}
2772
2773	static rtems_off64_t nfs_dir_lseek(
2774	rtems_libio_t *iop,
2775	rtems_off64_t length,
2776	int whence
2777	)
2778	{
2779	DirInfo di = iop->file_info;
2780
2781	/* we don't support anything other than
2782	* rewinding
2783	*/
2784	if (SEEK_SET != whence \|\| 0 != length) {
2785	errno = ENOTSUP;
2786	return -1;
2787	}
2788
2789	/* rewind cookie */
2790	memset( &di->readdirargs.cookie,
2791	0,
2792	sizeof(di->readdirargs.cookie) );
2793
2794	di->eofreached = FALSE;
2795
2796	return iop->offset;
2797	}
2798
2799	#define nfs_link_lseek 0
2800
2801	#if 0 /* structure types for reference */
2802	struct fattr {
2803	ftype type;
2804	u_int mode;
2805	u_int nlink;
2806	u_int uid;
2807	u_int gid;
2808	u_int size;
2809	u_int blocksize;
2810	u_int rdev;
2811	u_int blocks;
2812	u_int fsid;
2813	u_int fileid;
2814	nfstime atime;
2815	nfstime mtime;
2816	nfstime ctime;
2817	};
2818
2819	struct stat
2820	{
2821	dev_t st_dev;
2822	ino_t st_ino;
2823	mode_t st_mode;
2824	nlink_t st_nlink;
2825	uid_t st_uid;
2826	gid_t st_gid;
2827	dev_t st_rdev;
2828	rtems_off64_t st_size;
2829	/* SysV/sco doesn't have the rest... But Solaris, eabi does. */
2830	#if defined(__svr4__) && !defined(__PPC__) && !defined(__sun__)
2831	time_t st_atime;
2832	time_t st_mtime;
2833	time_t st_ctime;
2834	#else
2835	time_t st_atime;
2836	long st_spare1;
2837	time_t st_mtime;
2838	long st_spare2;
2839	time_t st_ctime;
2840	long st_spare3;
2841	long st_blksize;
2842	long st_blocks;
2843	long st_spare4[2];
2844	#endif
2845	};
2846	#endif
2847
2848	/* common for file/dir/link */
2849	static int nfs_fstat(
2850	rtems_filesystem_location_info_t *loc,
2851	struct stat *buf
2852	)
2853	{
2854	NfsNode node = loc->node_access;
2855	fattr *fa = &SERP_ATTR(node);
2856
2857	if (updateAttr(node, 0 /* only if old */)) {
2858	return -1;
2859	}
2860
2861	/* done by caller
2862	memset(buf, 0, sizeof(*buf));
2863	*/
2864
2865	/* translate */
2866
2867	/* one of the branches hopefully is optimized away */
2868	if (sizeof(ino_t) < sizeof(u_int)) {
2869	buf->st_dev = NFS_MAKE_DEV_T_INO_HACK((NfsNode)loc->node_access);
2870	} else {
2871	buf->st_dev = NFS_MAKE_DEV_T((NfsNode)loc->node_access);
2872	}
2873	buf->st_mode = fa->mode;
2874	buf->st_nlink = fa->nlink;
2875	buf->st_uid = fa->uid;
2876	buf->st_gid = fa->gid;
2877	buf->st_size = fa->size;
2878	/* Set to "preferred size" of this NFS client implementation */
2879	buf->st_blksize = nfsStBlksize ? nfsStBlksize : fa->blocksize;
2880	buf->st_rdev = fa->rdev;
2881	buf->st_blocks = fa->blocks;
2882	buf->st_ino = fa->fileid;
2883	buf->st_atime = fa->atime.seconds;
2884	buf->st_mtime = fa->mtime.seconds;
2885	buf->st_ctime = fa->ctime.seconds;
2886
2887	#if 0 /* NFS should return the modes */
2888	switch(fa->type) {
2889	default:
2890	case NFNON:
2891	case NFBAD:
2892	break;
2893
2894	case NFSOCK: buf->st_mode \|= S_IFSOCK; break;
2895	case NFFIFO: buf->st_mode \|= S_IFIFO; break;
2896	case NFREG : buf->st_mode \|= S_IFREG; break;
2897	case NFDIR : buf->st_mode \|= S_IFDIR; break;
2898	case NFBLK : buf->st_mode \|= S_IFBLK; break;
2899	case NFCHR : buf->st_mode \|= S_IFCHR; break;
2900	case NFLNK : buf->st_mode \|= S_IFLNK; break;
2901	}
2902	#endif
2903
2904	return 0;
2905	}
2906
2907	/* a helper which does the real work for
2908	* a couple of handlers (such as chmod,
2909	* ftruncate or utime)
2910	*/
2911	static int
2912	nfs_sattr(NfsNode node, sattr *arg, u_long mask)
2913	{
2914
2915	rtems_clock_time_value now;
2916	nfstime nfsnow, t;
2917	int e;
2918	u_int mode;
2919
2920	if (updateAttr(node, 0 /* only if old */))
2921	return -1;
2922
2923	rtems_clock_get(RTEMS_CLOCK_GET_TIME_VALUE, &now);
2924
2925	/* TODO: add rtems EPOCH - UNIX EPOCH seconds */
2926	nfsnow.seconds = now.seconds;
2927	nfsnow.useconds = now.microseconds;
2928
2929	/* merge permission bits into existing type bits */
2930	mode = SERP_ATTR(node).mode;
2931	if (mask & SATTR_MODE) {
2932	mode &= S_IFMT;
2933	mode \|= arg->mode & ~S_IFMT;
2934	} else {
2935	mode = -1;
2936	}
2937	SERP_ARGS(node).sattrarg.attributes.mode = mode;
2938
2939	SERP_ARGS(node).sattrarg.attributes.uid =
2940	(mask & SATTR_UID) ? arg->uid : -1;
2941
2942	SERP_ARGS(node).sattrarg.attributes.gid =
2943	(mask & SATTR_GID) ? arg->gid : -1;
2944
2945	SERP_ARGS(node).sattrarg.attributes.size =
2946	(mask & SATTR_SIZE) ? arg->size : -1;
2947
2948	if (mask & SATTR_ATIME)
2949	t = arg->atime;
2950	else if (mask & SATTR_TOUCHA)
2951	t = nfsnow;
2952	else
2953	t.seconds = t.useconds = -1;
2954	SERP_ARGS(node).sattrarg.attributes.atime = t;
2955
2956	if (mask & SATTR_ATIME)
2957	t = arg->mtime;
2958	else if (mask & SATTR_TOUCHA)
2959	t = nfsnow;
2960	else
2961	t.seconds = t.useconds = -1;
2962	SERP_ARGS(node).sattrarg.attributes.mtime = t;
2963
2964	node->serporid.status = NFS_OK;
2965
2966	if ( nfscall( node->nfs->server,
2967	NFSPROC_SETATTR,
2968	(xdrproc_t)xdr_sattrargs, &SERP_FILE(node),
2969	(xdrproc_t)xdr_attrstat, &node->serporid) ) {
2970	#if DEBUG & DEBUG_SYSCALLS
2971	fprintf(stderr,
2972	"nfs_sattr (mask 0x%08x): %s",
2973	mask,
2974	strerror(errno));
2975	#endif
2976	return -1;
2977	}
2978
2979	if (NFS_OK != (e=node->serporid.status) ) {
2980	#if DEBUG & DEBUG_SYSCALLS
2981	fprintf(stderr,"nfs_sattr: %s\n",strerror(e));
2982	#endif
2983	/* try at least to recover the current attributes */
2984	updateAttr(node, 1 /* force */);
2985	rtems_set_errno_and_return_minus_one(e);
2986	}
2987
2988	node->age = nowSeconds();
2989
2990	return 0;
2991	}
2992
2993
2994	/* common for file/dir/link */
2995	static int nfs_fchmod(
2996	rtems_filesystem_location_info_t *loc,
2997	mode_t mode
2998	)
2999	{
3000	sattr arg;
3001
3002	arg.mode = mode;
3003	return nfs_sattr(loc->node_access, &arg, SATTR_MODE);
3004
3005	}
3006
3007	/* just set the size attribute to 'length'
3008	* the server will take care of the rest :-)
3009	*/
3010	static int nfs_file_ftruncate(
3011	rtems_libio_t *iop,
3012	rtems_off64_t length
3013	)
3014	{
3015	sattr arg;
3016
3017	arg.size = length;
3018	/* must not modify any other attribute; if we are not the owner
3019	* of the file or directory but only have write access changing
3020	* any attribute besides 'size' will fail...
3021	*/
3022	return nfs_sattr(iop->pathinfo.node_access,
3023	&arg,
3024	SATTR_SIZE);
3025	}
3026
3027	#define nfs_dir_ftruncate 0
3028	#define nfs_link_ftruncate 0
3029
3030	/* not implemented */
3031	#ifdef DECLARE_BODY
3032	static int nfs_file_fpathconf(
3033	rtems_libio_t *iop,
3034	int name
3035	)DECLARE_BODY
3036	#else
3037	#define nfs_file_fpathconf 0
3038	#define nfs_dir_fpathconf 0
3039	#define nfs_link_fpathconf 0
3040	#endif
3041
3042	/* unused */
3043	#ifdef DECLARE_BODY
3044	static int nfs_file_fsync(
3045	rtems_libio_t *iop
3046	)DECLARE_BODY
3047	#else
3048	#define nfs_file_fsync 0
3049	#define nfs_dir_fsync 0
3050	#define nfs_link_fsync 0
3051	#endif
3052
3053	/* unused */
3054	#ifdef DECLARE_BODY
3055	static int nfs_file_fdatasync(
3056	rtems_libio_t *iop
3057	)DECLARE_BODY
3058	#else
3059	#define nfs_file_fdatasync 0
3060	#define nfs_dir_fdatasync 0
3061	#define nfs_link_fdatasync 0
3062	#endif
3063
3064	/* unused */
3065	#ifdef DECLARE_BODY
3066	static int nfs_file_fcntl(
3067	int cmd,
3068	rtems_libio_t *iop
3069	)DECLARE_BODY
3070	#else
3071	#define nfs_file_fcntl 0
3072	#define nfs_dir_fcntl 0
3073	#define nfs_link_fcntl 0
3074	#endif
3075
3076	/* files and symlinks are removed
3077	* by the common nfs_unlink() routine.
3078	* NFS has a different NFSPROC_RMDIR
3079	* call, though...
3080	*/
3081	static int nfs_dir_rmnod(
3082	rtems_filesystem_location_info_t pathloc / IN */
3083	)
3084	{
3085	return nfs_do_unlink(pathloc, NFSPROC_RMDIR);
3086	}
3087
3088	/* the file handlers table */
3089	static
3090	struct _rtems_filesystem_file_handlers_r nfs_file_file_handlers = {
3091	nfs_file_open, /* OPTIONAL; may be NULL */
3092	nfs_file_close, /* OPTIONAL; may be NULL */
3093	nfs_file_read, /* OPTIONAL; may be NULL */
3094	nfs_file_write, /* OPTIONAL; may be NULL */
3095	nfs_file_ioctl, /* OPTIONAL; may be NULL */
3096	nfs_file_lseek, /* OPTIONAL; may be NULL */
3097	nfs_fstat, /* OPTIONAL; may be NULL */
3098	nfs_fchmod, /* OPTIONAL; may be NULL */
3099	nfs_file_ftruncate, /* OPTIONAL; may be NULL */
3100	nfs_file_fpathconf, /* OPTIONAL; may be NULL - UNUSED */
3101	nfs_file_fsync, /* OPTIONAL; may be NULL */
3102	nfs_file_fdatasync, /* OPTIONAL; may be NULL */
3103	nfs_file_fcntl, /* OPTIONAL; may be NULL */
3104	nfs_unlink, /* OPTIONAL; may be NULL */
3105	};
3106
3107	/* the directory handlers table */
3108	static
3109	struct _rtems_filesystem_file_handlers_r nfs_dir_file_handlers = {
3110	nfs_dir_open, /* OPTIONAL; may be NULL */
3111	nfs_dir_close, /* OPTIONAL; may be NULL */
3112	nfs_dir_read, /* OPTIONAL; may be NULL */
3113	nfs_dir_write, /* OPTIONAL; may be NULL */
3114	nfs_dir_ioctl, /* OPTIONAL; may be NULL */
3115	nfs_dir_lseek, /* OPTIONAL; may be NULL */
3116	nfs_fstat, /* OPTIONAL; may be NULL */
3117	nfs_fchmod, /* OPTIONAL; may be NULL */
3118	nfs_dir_ftruncate, /* OPTIONAL; may be NULL */
3119	nfs_dir_fpathconf, /* OPTIONAL; may be NULL - UNUSED */
3120	nfs_dir_fsync, /* OPTIONAL; may be NULL */
3121	nfs_dir_fdatasync, /* OPTIONAL; may be NULL */
3122	nfs_dir_fcntl, /* OPTIONAL; may be NULL */
3123	nfs_dir_rmnod, /* OPTIONAL; may be NULL */
3124	};
3125
3126	/* the link handlers table */
3127	static
3128	struct _rtems_filesystem_file_handlers_r nfs_link_file_handlers = {
3129	nfs_link_open, /* OPTIONAL; may be NULL */
3130	nfs_link_close, /* OPTIONAL; may be NULL */
3131	nfs_link_read, /* OPTIONAL; may be NULL */
3132	nfs_link_write, /* OPTIONAL; may be NULL */
3133	nfs_link_ioctl, /* OPTIONAL; may be NULL */
3134	nfs_link_lseek, /* OPTIONAL; may be NULL */
3135	nfs_fstat, /* OPTIONAL; may be NULL */
3136	nfs_fchmod, /* OPTIONAL; may be NULL */
3137	nfs_link_ftruncate, /* OPTIONAL; may be NULL */
3138	nfs_link_fpathconf, /* OPTIONAL; may be NULL - UNUSED */
3139	nfs_link_fsync, /* OPTIONAL; may be NULL */
3140	nfs_link_fdatasync, /* OPTIONAL; may be NULL */
3141	nfs_link_fcntl, /* OPTIONAL; may be NULL */
3142	nfs_unlink, /* OPTIONAL; may be NULL */
3143	};
3144
3145	/* we need a dummy driver entry table to get a
3146	* major number from the system
3147	*/
3148	static
3149	rtems_device_driver nfs_initialize(
3150	rtems_device_major_number major,
3151	rtems_device_minor_number minor,
3152	void *arg
3153	)
3154	{
3155	/* we don't really use this routine because
3156	* we cannot supply an argument (contrary
3157	* to what the 'arg' parameter suggests - it
3158	* is always set to 0 by the generics :-()
3159	* and because we don't want the user to
3160	* have to deal with the major number (which
3161	* OTOH is something WE are interested in. The
3162	* only reason for using this API was getting
3163	* a major number, after all).
3164	*
3165	* Something must be present, however, to
3166	* reserve a slot in the driver table.
3167	*/
3168	return RTEMS_SUCCESSFUL;
3169	}
3170
3171	static rtems_driver_address_table drvNfs = {
3172	nfs_initialize,
3173	0, /* open */
3174	0, /* close */
3175	0, /* read */
3176	0, /* write */
3177	0 /* control */
3178	};
3179
3180	/* Dump a list of the currently mounted NFS to a file */
3181	int
3182	nfsMountsShow(FILE *f)
3183	{
3184	char *mntpt = 0;
3185	Nfs nfs;
3186
3187	if (!f)
3188	f = stdout;
3189
3190	if ( !(mntpt=malloc(MAXPATHLEN)) ) {
3191	fprintf(stderr,"nfsMountsShow(): no memory\n");
3192	return -1;
3193	}
3194
3195	fprintf(f,"Currently Mounted NFS:\n");
3196
3197	LOCK(nfsGlob.llock);
3198
3199	for (nfs = nfsGlob.mounted_fs; nfs; nfs=nfs->next) {
3200	fprintf(f,"%s on ", nfs->mt_entry->dev);
3201	if (rtems_filesystem_resolve_location(mntpt, MAXPATHLEN, &nfs->mt_entry->mt_fs_root))
3202	fprintf(f,"<UNABLE TO LOOKUP MOUNTPOINT>\n");
3203	else
3204	fprintf(f,"%s\n",mntpt);
3205	}
3206
3207	UNLOCK(nfsGlob.llock);
3208
3209	free(mntpt);
3210	return 0;
3211	}
3212
3213	/* convenience wrapper
3214	*
3215	* NOTE: this routine calls NON-REENTRANT
3216	* gethostbyname() if the host is
3217	* not in 'dot' notation.
3218	*/
3219	int
3220	nfsMount(char uidhost, char path, char *mntpoint)
3221	{
3222	rtems_filesystem_mount_table_entry_t *mtab;
3223	struct stat st;
3224	int devl;
3225	char *host;
3226	int rval = -1;
3227	char *dev = 0;
3228
3229	if (!uidhost \|\| !path \|\| !mntpoint) {
3230	fprintf(stderr,"usage: nfsMount(""[uid.gid@]host"",""path"",""mountpoint"")\n");
3231	nfsMountsShow(stderr);
3232	return -1;
3233	}
3234
3235	if ( !(dev = malloc((devl=strlen(uidhost) + 20 + strlen(path)+1))) ) {
3236	fprintf(stderr,"nfsMount: out of memory\n");
3237	return -1;
3238	}
3239
3240	/* Try to create the mount point if nonexistent */
3241	if (stat(mntpoint, &st)) {
3242	if (ENOENT != errno) {
3243	perror("nfsMount trying to create mount point - stat failed");
3244	goto cleanup;
3245	} else if (mkdir(mntpoint,0777)) {
3246	perror("nfsMount trying to create mount point");
3247	goto cleanup;
3248	}
3249	}
3250
3251	if ( !(host=strchr(uidhost,UIDSEP)) ) {
3252	host = uidhost;
3253	} else {
3254	host++;
3255	}
3256
3257	if (isdigit(*host)) {
3258	/* avoid using gethostbyname */
3259	sprintf(dev,"%s:%s",uidhost,path);
3260	} else {
3261	struct hostent *h;
3262
3263	/* copy the uid part (hostname will be
3264	* overwritten)
3265	*/
3266	strcpy(dev, uidhost);
3267
3268	/* NOTE NOTE NOTE: gethostbyname is NOT
3269	* thread safe. This is UGLY
3270	*/
3271
3272	/* BEGIN OF NON-THREAD SAFE REGION */
3273
3274	h = gethostbyname(host);
3275
3276	if ( !h \|\|
3277	!inet_ntop( AF_INET,
3278	(struct in_addr*)h->h_addr_list[0],
3279	dev + (host - uidhost),
3280	devl - (host - uidhost) )
3281	) {
3282	fprintf(stderr,"nfsMount: host '%s' not found\n",host);
3283	goto cleanup;
3284	}
3285
3286	/* END OF NON-THREAD SAFE REGION */
3287
3288	/* append ':<path>' */
3289	strcat(dev,":");
3290	strcat(dev,path);
3291	}
3292
3293	printf("Trying to mount %s on %s\n",dev,mntpoint);
3294
3295	if (mount(&mtab,
3296	&nfs_fs_ops,
3297	RTEMS_FILESYSTEM_READ_WRITE,
3298	dev,
3299	mntpoint)) {
3300	perror("nfsMount - mount");
3301	goto cleanup;
3302	}
3303
3304	rval = 0;
3305
3306	cleanup:
3307	free(dev);
3308	return rval;
3309	}
3310
3311	/* HERE COMES A REALLY UGLY HACK */
3312
3313	/* This is stupid; it is _very_ hard to find the path
3314	* leading to a rtems_filesystem_location_info_t node :-(
3315	* The only easy way is making the location the current
3316	* directory and issue a getcwd().
3317	* However, since we don't want to tamper with the
3318	* current directory, we must create a separate
3319	* task to do the job for us - sigh.
3320	*/
3321
3322	typedef struct ResolvePathArgRec_ {
3323	rtems_filesystem_location_info_t loc; / IN: location to resolve */
3324	char buf; / IN/OUT: buffer where to put the path */
3325	int len; /* IN: buffer length */
3326	rtems_id sync; /* IN: synchronization */
3327	rtems_status_code status; /* OUT: result */
3328	} ResolvePathArgRec, *ResolvePathArg;
3329
3330	static void
3331	resolve_path(rtems_task_argument arg)
3332	{
3333	ResolvePathArg rpa = (ResolvePathArg)arg;
3334	rtems_filesystem_location_info_t old;
3335
3336	/* IMPORTANT: let the helper task have its own libio environment (i.e. cwd) */
3337	if (RTEMS_SUCCESSFUL == (rpa->status = rtems_libio_set_private_env())) {
3338
3339	old = rtems_filesystem_current;
3340
3341	rtems_filesystem_current = *(rpa->loc);
3342
3343	if ( !getcwd(rpa->buf, rpa->len) )
3344	rpa->status = RTEMS_UNSATISFIED;
3345
3346	/* must restore the cwd because 'freenode' will be called on it */
3347	rtems_filesystem_current = old;
3348	}
3349	rtems_semaphore_release(rpa->sync);
3350	rtems_task_delete(RTEMS_SELF);
3351	}
3352
3353
3354	/* a utility routine to find the path leading to a
3355	* rtems_filesystem_location_info_t node
3356	*
3357	* INPUT: 'loc' and a buffer 'buf' (length 'len') to hold the
3358	* path.
3359	* OUTPUT: path copied into 'buf'
3360	*
3361	* RETURNS: 0 on success, RTEMS error code on error.
3362	*/
3363	rtems_status_code
3364	rtems_filesystem_resolve_location(char buf, int len, rtems_filesystem_location_info_t loc)
3365	{
3366	ResolvePathArgRec arg;
3367	rtems_id tid = 0;
3368	rtems_task_priority pri;
3369	rtems_status_code status;
3370
3371	arg.loc = loc;
3372	arg.buf = buf;
3373	arg.len = len;
3374	arg.sync = 0;
3375
3376	status = rtems_semaphore_create(
3377	rtems_build_name('r','e','s','s'),
3378	0,
3379	RTEMS_SIMPLE_BINARY_SEMAPHORE,
3380	0,
3381	&arg.sync);
3382
3383	if (RTEMS_SUCCESSFUL != status)
3384	goto cleanup;
3385
3386	rtems_task_set_priority(RTEMS_SELF, RTEMS_CURRENT_PRIORITY, &pri);
3387
3388	status = rtems_task_create(
3389	rtems_build_name('r','e','s','s'),
3390	pri,
3391	RTEMS_MINIMUM_STACK_SIZE + 50000,
3392	RTEMS_DEFAULT_MODES,
3393	RTEMS_DEFAULT_ATTRIBUTES,
3394	&tid);
3395
3396	if (RTEMS_SUCCESSFUL != status)
3397	goto cleanup;
3398
3399	status = rtems_task_start(tid, resolve_path, (rtems_task_argument)&arg);
3400
3401	if (RTEMS_SUCCESSFUL != status) {
3402	rtems_task_delete(tid);
3403	goto cleanup;
3404	}
3405
3406
3407	/* synchronize with the helper task */
3408	rtems_semaphore_obtain(arg.sync, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
3409
3410	status = arg.status;
3411
3412	cleanup:
3413	if (arg.sync)
3414	rtems_semaphore_delete(arg.sync);
3415
3416	return status;
3417	}
3418
3419	int
3420	nfsSetTimeout(uint32_t timeout_ms)
3421	{
3422	rtems_interrupt_level k;
3423	uint32_t s,us;
3424
3425	if ( timeout_ms > 100000 ) {
3426	/* out of range */
3427	return -1;
3428	}
3429
3430	s = timeout_ms/1000;
3431	us = (timeout_ms % 1000) * 1000;
3432
3433	rtems_interrupt_disable(k);
3434	_nfscalltimeout.tv_sec = s;
3435	_nfscalltimeout.tv_usec = us;
3436	rtems_interrupt_enable(k);
3437
3438	return 0;
3439	}
3440
3441	uint32_t
3442	nfsGetTimeout( void )
3443	{
3444	rtems_interrupt_level k;
3445	uint32_t s,us;
3446	rtems_interrupt_disable(k);
3447	s = _nfscalltimeout.tv_sec;
3448	us = _nfscalltimeout.tv_usec;
3449	rtems_interrupt_enable(k);
3450	return s*1000 + us/1000;
3451	}

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source: rtems/cpukit/libfs/src/nfsclient/src/nfs.c @ 07d6fd5

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