Context Navigation

nfs.c @ 9788279

4.115

Last change on this file since 9788279 was 9788279, checked in by Sebastian Huber <sebastian.huber@…>, on 08/25/10 at 09:37:49

2010-08-25 Sebastian Huber <sebastian.huber@…>

libfs/src/imfs/imfs_fcntl.c: Removed file.
libfs/Makefile.am: Reflect change from above.
libfs/src/defaults/default_fcntl.c: Return 0 instead of -1 and errno.
libfs/src/imfs/imfs.h, libfs/src/imfs/imfs_fifo.c, libfs/src/imfs/imfs_handlers_directory.c, libfs/src/imfs/imfs_handlers_memfile.c, libfs/src/nfsclient/src/nfs.c, libfs/src/rfs/rtems-rfs-rtems-dir.c, libfs/src/rfs/rtems-rfs-rtems-file.c, libfs/src/rfs/rtems-rfs-rtems.c, libfs/src/rfs/rtems-rfs-rtems.h: Use default file system handlers.

Property mode set to 100644

File size: 78.0 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	/* Hacked on by others. */
8
9	/*
10	* Authorship
11	* ----------
12	* This software (NFS-2 client implementation for RTEMS) was created by
13	* Till Straumann <strauman@slac.stanford.edu>, 2002-2007,
14	* Stanford Linear Accelerator Center, Stanford University.
15	*
16	* Acknowledgement of sponsorship
17	* ------------------------------
18	* The NFS-2 client implementation for RTEMS was produced by
19	* the Stanford Linear Accelerator Center, Stanford University,
20	* under Contract DE-AC03-76SFO0515 with the Department of Energy.
21	*
22	* Government disclaimer of liability
23	* ----------------------------------
24	* Neither the United States nor the United States Department of Energy,
25	* nor any of their employees, makes any warranty, express or implied, or
26	* assumes any legal liability or responsibility for the accuracy,
27	* completeness, or usefulness of any data, apparatus, product, or process
28	* disclosed, or represents that its use would not infringe privately owned
29	* rights.
30	*
31	* Stanford disclaimer of liability
32	* --------------------------------
33	* Stanford University makes no representations or warranties, express or
34	* implied, nor assumes any liability for the use of this software.
35	*
36	* Stanford disclaimer of copyright
37	* --------------------------------
38	* Stanford University, owner of the copyright, hereby disclaims its
39	* copyright and all other rights in this software. Hence, anyone may
40	* freely use it for any purpose without restriction.
41	*
42	* Maintenance of notices
43	* ----------------------
44	* In the interest of clarity regarding the origin and status of this
45	* SLAC software, this and all the preceding Stanford University notices
46	* are to remain affixed to any copy or derivative of this software made
47	* or distributed by the recipient and are to be affixed to any copy of
48	* software made or distributed by the recipient that contains a copy or
49	* derivative of this software.
50	*
51	* ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03
52	*/
53
54	#ifdef HAVE_CONFIG_H
55	#include <config.h>
56	#endif
57
58	#include <rtems.h>
59	#include <rtems/libio.h>
60	#include <rtems/libio_.h>
61	#include <rtems/seterr.h>
62	#include <string.h>
63	#include <stdio.h>
64	#include <stdlib.h>
65	#include <assert.h>
66	#include <sys/stat.h>
67	#include <dirent.h>
68	#include <netdb.h>
69	#include <ctype.h>
70	#include <netinet/in.h>
71	#include <arpa/inet.h>
72
73	#include <nfs_prot.h>
74	#include <mount_prot.h>
75
76	#include "rpcio.h"
77
78	/* Configurable parameters */
79
80	/* Estimated average length of a filename (including terminating 0).
81	* This was calculated by doing
82	*
83	* find <some root> -print -exec basename '{}' \; > feil
84	* wc feil
85	*
86	* AVG_NAMLEN = (num_chars + num_lines)/num_lines
87	*/
88	#define CONFIG_AVG_NAMLEN 10
89
90	#define CONFIG_NFS_SMALL_XACT_SIZE 800 /* size of RPC arguments for non-write ops */
91	/* lifetime of NFS attributes in a NfsNode;
92	* the time is in seconds and the lifetime is
93	* infinite if the symbol is #undef
94	*/
95	#define CONFIG_ATTR_LIFETIME 10/secs/
96
97	/*
98	* The 'st_blksize' (stat(2)) value this nfs
99	* client should report. If set to zero then the server's fattr data
100	* is passed throught which is not necessary optimal.
101	* Newlib's stdio uses 'st_blksize' (if built with HAVE_BLKSIZE defined)
102	* to size the default buffer.
103	* Due to the overhead of NFS it is probably better to use the maximum
104	* size of an NFS read request (8k) rather than the optimal block
105	* size on the server.
106	* This value can be overridden at run-time by setting the global
107	* variable 'nfsStBlksize'.
108	* Thanks to Steven Johnson <sjohnson@sakuraindustries.com> for helping
109	* working on this issue.
110	*/
111	#define DEFAULT_NFS_ST_BLKSIZE NFS_MAXDATA
112
113	/* dont change this without changing the maximal write size */
114	#define CONFIG_NFS_BIG_XACT_SIZE UDPMSGSIZE /* dont change this */
115
116	/* The real values for these are specified further down */
117	#define NFSCALL_TIMEOUT (&_nfscalltimeout)
118	#define MNTCALL_TIMEOUT (&_nfscalltimeout)
119	static struct timeval _nfscalltimeout = { 10, 0 }; /* {secs, us } */
120
121	/* More or less fixed constants; in particular, NFS3 is not supported */
122	#define DELIM '/'
123	#define HOSTDELIM ':'
124	#define UPDIR ".."
125	#define UIDSEP '@'
126	#define NFS_VERSION_2 NFS_VERSION
127
128	/* we use a dynamically assigned major number */
129	#define NFS_MAJOR (nfsGlob.nfs_major)
130
131
132	/* NOTE: RTEMS (ss-20020301) uses a 'short st_ino' type :-( but the
133	* NFS fileid is 32 bit. [Later versions of RTEMS have fixed this;
134	* nfsInit() issues a warning if you run a version with 'short st_ino'.]
135	*
136	* As a workarount, we merge the upper 16bits of the fileid into the
137	* minor device no. Hence, it is still possible to uniquely identify
138	* a file by looking at its device number (major = nfs, minor = part
139	* of the fileid + our 'nfs-id' identifier).
140	*
141	* This has an impact on performance, as e.g. getcwd() stats() all
142	* directory entries when it believes it has crossed a mount point
143	* (a.st_dev != b.st_dev).
144	*
145	* OTOH, it also might cause node comparison failure! E.g. 'getcwd()'
146	* assumes that two nodes residing in the same directory must be located
147	* on the same device and hence compares 'st_ino' only.
148	* If two files in the same directory have the same inode number
149	* modulo 2^16, they will be considered equal (although their device
150	* number doesn't match - getcwd doesn't look at it).
151	*
152	* Other software might or might not be affected.
153	*
154	* The only clean solution to this problem is bumping up the size of
155	* 'ino_t' at least to 'long'.
156	* Note that this requires _all_ software (libraries etc.) to be
157	* recompiled.
158	*/
159
160	#define NFS_MAKE_DEV_T_INO_HACK(node) \
161	rtems_filesystem_make_dev_t( NFS_MAJOR, \
162	(((rtems_device_minor_number)((node)->nfs->id))<<16) \| (((rtems_device_minor_number)SERP_ATTR((node)).fileid) >> 16) )
163
164	/* use our 'nfs id' and the server's fsid for the minor device number
165	* this should be fairly unique
166	*/
167	#define NFS_MAKE_DEV_T(node) \
168	rtems_filesystem_make_dev_t( NFS_MAJOR, \
169	(((rtems_device_minor_number)((node)->nfs->id))<<16) \| (SERP_ATTR((node)).fsid & (((rtems_device_minor_number)1<<16)-1)) )
170
171	#define DIRENT_HEADER_SIZE ( sizeof(struct dirent) - \
172	sizeof( ((struct dirent *)0)->d_name ) )
173
174
175	/* debugging flags */
176	#define DEBUG_COUNT_NODES (1<<0)
177	#define DEBUG_TRACK_NODES (1<<1)
178	#define DEBUG_EVALPATH (1<<2)
179	#define DEBUG_READDIR (1<<3)
180	#define DEBUG_SYSCALLS (1<<4)
181
182	/* #define DEBUG ( DEBUG_SYSCALLS \| DEBUG_COUNT_NODES ) */
183
184	#ifdef DEBUG
185	#define STATIC
186	#else
187	#define STATIC static
188	#endif
189
190	#define MUTEX_ATTRIBUTES (RTEMS_LOCAL \| \
191	RTEMS_PRIORITY \| \
192	RTEMS_INHERIT_PRIORITY \| \
193	RTEMS_BINARY_SEMAPHORE)
194
195	#define LOCK(s) do { \
196	rtems_semaphore_obtain((s), \
197	RTEMS_WAIT, \
198	RTEMS_NO_TIMEOUT); \
199	} while (0)
200
201	#define UNLOCK(s) do { rtems_semaphore_release((s)); \
202	} while (0)
203
204	/*****************************************
205	Types with Associated XDR Routines
206	*****************************************/
207
208	/* a string buffer with a maximal length.
209	* If the buffer pointer is NULL, it is updated
210	* with an appropriately allocated area.
211	*/
212	typedef struct strbuf {
213	char *buf;
214	u_int max;
215	} strbuf;
216
217	static bool_t
218	xdr_strbuf(XDR xdrs, strbuf obj)
219	{
220	return xdr_string(xdrs, &obj->buf, obj->max);
221	}
222
223	/* Read 'readlink' results into a 'strbuf'.
224	* This is convenient as it avoids
225	* one extra step of copying / lenght
226	* checking.
227	*/
228	typedef struct readlinkres_strbuf {
229	nfsstat status;
230	strbuf strbuf;
231	} readlinkres_strbuf;
232
233	static bool_t
234	xdr_readlinkres_strbuf(XDR xdrs, readlinkres_strbuf objp)
235	{
236	if ( !xdr_nfsstat(xdrs, &objp->status) )
237	return FALSE;
238
239	if ( NFS_OK == objp->status ) {
240	if ( !xdr_string(xdrs, &objp->strbuf.buf, objp->strbuf.max) )
241	return FALSE;
242	}
243	return TRUE;
244	}
245
246
247	/* DirInfoRec is used instead of dirresargs
248	* to convert recursion into iteration. The
249	* 'rpcgen'erated xdr_dirresargs ends up
250	* doing nested calls when unpacking the
251	* 'next' pointers.
252	*/
253
254	typedef struct DirInfoRec_ {
255	readdirargs readdirargs;
256	/* clone of the 'readdirres' fields;
257	* the cookie is put into the readdirargs above
258	*/
259	nfsstat status;
260	char buf, ptr;
261	int len;
262	bool_t eofreached;
263	} DirInfoRec, *DirInfo;
264
265	/* this deals with one entry / record */
266	static bool_t
267	xdr_dir_info_entry(XDR *xdrs, DirInfo di)
268	{
269	union {
270	char nambuf[NFS_MAXNAMLEN+1];
271	nfscookie cookie;
272	} dummy;
273	struct dirent pde = (struct dirent )di->ptr;
274	u_int fileid;
275	char *name;
276	register int nlen = 0,len,naligned = 0;
277	nfscookie *pcookie;
278
279	len = di->len;
280
281	if ( !xdr_u_int(xdrs, &fileid) )
282	return FALSE;
283
284	/* we must pass the address of a char* */
285	name = (len > NFS_MAXNAMLEN) ? pde->d_name : dummy.nambuf;
286
287	if ( !xdr_filename(xdrs, &name) ) {
288	return FALSE;
289	}
290
291	if (len >= 0) {
292	nlen = strlen(name);
293	naligned = nlen + 1 /* string delimiter / + 3 / alignment */;
294	naligned &= ~3;
295	len -= naligned;
296	}
297
298	/* if the cookie goes into the DirInfo, we hope this doesn't fail
299	* - the caller ends up with an invalid readdirargs cookie otherwise...
300	*/
301	pcookie = (len >= 0) ? &di->readdirargs.cookie : &dummy.cookie;
302	if ( !xdr_nfscookie(xdrs, pcookie) ) {
303	return FALSE;
304	}
305
306	di->len = len;
307	/* adjust the buffer pointer */
308	if (len >= 0) {
309	pde->d_ino = fileid;
310	pde->d_namlen = nlen;
311	pde->d_off = di->ptr - di->buf;
312	if (name == dummy.nambuf) {
313	memcpy(pde->d_name, dummy.nambuf, nlen + 1);
314	}
315	pde->d_reclen = DIRENT_HEADER_SIZE + naligned;
316	di->ptr += pde->d_reclen;
317	}
318
319	return TRUE;
320	}
321
322	/* this routine loops over all entries */
323	static bool_t
324	xdr_dir_info(XDR *xdrs, DirInfo di)
325	{
326	DirInfo dip;
327
328	if ( !xdr_nfsstat(xdrs, &di->status) )
329	return FALSE;
330
331	if ( NFS_OK != di->status )
332	return TRUE;
333
334	dip = di;
335
336	while (dip) {
337	/* reserve space for the dirent 'header' - we assume it's word aligned! */
338	#ifdef DEBUG
339	assert( DIRENT_HEADER_SIZE % 4 == 0 );
340	#endif
341	dip->len -= DIRENT_HEADER_SIZE;
342
343	/* we pass a 0 size - size is unused since
344	* we always pass a non-NULL pointer
345	*/
346	if ( !xdr_pointer(xdrs, (void)&dip, 0 / size */, (xdrproc_t)xdr_dir_info_entry) )
347	return FALSE;
348	}
349
350	if ( ! xdr_bool(xdrs, &di->eofreached) )
351	return FALSE;
352
353	/* if everything fits into the XDR buffer but not the user's buffer,
354	* they must resume reading from where xdr_dir_info_entry() started
355	* skipping and 'eofreached' needs to be adjusted
356	*/
357	if ( di->len < 0 && di->eofreached )
358	di->eofreached = FALSE;
359
360	return TRUE;
361	}
362
363
364	/* a type better suited for node operations
365	* than diropres.
366	* fattr and fhs are swapped so parts of this
367	* structure may be used as a diroparg which
368	* is practical when looking up paths.
369	*/
370
371	/* Macro for accessing serporid fields
372	*/
373	#define SERP_ARGS(node) ((node)->serporid.serporid_u.serporid.arg_u)
374	#define SERP_ATTR(node) ((node)->serporid.serporid_u.serporid.attributes)
375	#define SERP_FILE(node) ((node)->serporid.serporid_u.serporid.file)
376
377
378	typedef struct serporidok {
379	fattr attributes;
380	nfs_fh file;
381	union {
382	struct {
383	filename name;
384	} diroparg;
385	struct {
386	sattr attributes;
387	} sattrarg;
388	struct {
389	uint32_t offset;
390	uint32_t count;
391	uint32_t totalcount;
392	} readarg;
393	struct {
394	uint32_t beginoffset;
395	uint32_t offset;
396	uint32_t totalcount;
397	struct {
398	uint32_t data_len;
399	char* data_val;
400	} data;
401	} writearg;
402	struct {
403	filename name;
404	sattr attributes;
405	} createarg;
406	struct {
407	filename name;
408	diropargs to;
409	} renamearg;
410	struct {
411	diropargs to;
412	} linkarg;
413	struct {
414	filename name;
415	nfspath to;
416	sattr attributes;
417	} symlinkarg;
418	struct {
419	nfscookie cookie;
420	uint32_t count;
421	} readdirarg;
422	} arg_u;
423	} serporidok;
424
425	typedef struct serporid {
426	nfsstat status;
427	union {
428	serporidok serporid;
429	} serporid_u;
430	} serporid;
431
432	/* an XDR routine to encode/decode the inverted diropres
433	* into an nfsnodestat;
434	*
435	* NOTE: this routine only acts on
436	* - 'serporid.status'
437	* - 'serporid.file'
438	* - 'serporid.attributes'
439	* and leaves the 'arg_u' alone.
440	*
441	* The idea is that a 'diropres' is read into 'serporid'
442	* which can then be used as an argument to subsequent
443	* NFS-RPCs (after filling in the node's arg_u).
444	*/
445	static bool_t
446	xdr_serporidok(XDR xdrs, serporidok objp)
447	{
448	if (!xdr_nfs_fh (xdrs, &objp->file))
449	return FALSE;
450	if (!xdr_fattr (xdrs, &objp->attributes))
451	return FALSE;
452	return TRUE;
453	}
454
455	static bool_t
456	xdr_serporid(XDR xdrs, serporid objp)
457	{
458	if (!xdr_nfsstat (xdrs, &objp->status))
459	return FALSE;
460	switch (objp->status) {
461	case NFS_OK:
462	if (!xdr_serporidok(xdrs, &objp->serporid_u.serporid))
463	return FALSE;
464	break;
465	default:
466	break;
467	}
468	return TRUE;
469	}
470
471	/*****************************************
472	Data Structures and Types
473	*****************************************/
474
475	/* 'time()' hack with less overhead; */
476
477	/* assume reading a long word is atomic */
478	#define READ_LONG_IS_ATOMIC
479
480	typedef uint32_t TimeStamp;
481
482	static inline TimeStamp
483	nowSeconds(void)
484	{
485	rtems_interval rval;
486	rtems_clock_get_seconds_since_epoch( &rval );
487	return rval;
488	}
489
490
491	/* Per mounted FS structure */
492	typedef struct NfsRec_ {
493	/* the NFS server we're talking to.
494	*/
495	RpcUdpServer server;
496	/* statistics; how many NfsNodes are
497	* currently alive.
498	*/
499	volatile int nodesInUse;
500	#if DEBUG & DEBUG_COUNT_NODES
501	/* statistics; how many 'NfsNode.str'
502	* strings are currently allocated.
503	*/
504	volatile int stringsInUse;
505	#endif
506	/* A small number who uniquely
507	* identifies a mounted NFS within
508	* this driver (i.e. this NfsRec).
509	* Each time a NFS is mounted, the
510	* global ID counter is incremented
511	* and its value is assigned to the
512	* newly created NfsRec.
513	*/
514	u_short id;
515	/* Our RTEMS filesystem mt_entry
516	*/
517	rtems_filesystem_mount_table_entry_t *mt_entry;
518	/* Next NfsRec on a linked list who
519	* is anchored at nfsGlob
520	*/
521	struct NfsRec_ *next;
522	/* Who we pretend we are
523	*/
524	u_long uid,gid;
525	} NfsRec, *Nfs;
526
527	typedef struct NfsNodeRec_ {
528	/* This holds this node's attributes
529	* (stats) and its nfs filehandle.
530	* It also contains room for nfs rpc
531	* arguments.
532	*/
533	serporid serporid;
534	/* The arguments we used when doing
535	* the 'lookup' call for this node.
536	* We need this information (especially
537	* the directory FH) for performing
538	* certain operations on this
539	* node (in particular: for unlinking
540	* it from a parent directory)
541	*/
542	diropargs args;
543	/* FS this node belongs to
544	*/
545	Nfs nfs;
546	/* A buffer for the string the
547	* args.name points to.
548	* We need this because args.name might
549	* temporarily point to strings on the
550	* stack. Duplicates are allocated from
551	* the heap and attached to 'str' so
552	* they can be released as appropriate.
553	*/
554	char *str;
555	/* A timestamp for the stats
556	*/
557	TimeStamp age;
558	} NfsNodeRec, *NfsNode;
559
560	/*****************************************
561	Forward Declarations
562	*****************************************/
563
564	static int nfs_readlink(
565	rtems_filesystem_location_info_t loc, / IN */
566	char buf, / OUT */
567	size_t len
568	);
569
570	static int updateAttr(NfsNode node, int force);
571
572	/* Mask bits when setting attributes.
573	* Only the 'arg' fields with their
574	* corresponding bit set in the mask
575	* will be used. The others are left
576	* unchanged.
577	* The 'TOUCH' bits instruct nfs_sattr()
578	* to update the respective time
579	* fields to the current time
580	*/
581	#define SATTR_MODE (1<<0)
582	#define SATTR_UID (1<<1)
583	#define SATTR_GID (1<<2)
584	#define SATTR_SIZE (1<<3)
585	#define SATTR_ATIME (1<<4)
586	#define SATTR_TOUCHA (1<<5)
587	#define SATTR_MTIME (1<<6)
588	#define SATTR_TOUCHM (1<<7)
589	#define SATTR_TOUCH (SATTR_TOUCHM \| SATTR_TOUCHA)
590
591	static int
592	nfs_sattr(NfsNode node, sattr *arg, u_long mask);
593
594	extern struct _rtems_filesystem_operations_table nfs_fs_ops;
595	static struct _rtems_filesystem_file_handlers_r nfs_file_file_handlers;
596	static struct _rtems_filesystem_file_handlers_r nfs_dir_file_handlers;
597	static struct _rtems_filesystem_file_handlers_r nfs_link_file_handlers;
598	static rtems_driver_address_table drvNfs;
599
600	int
601	nfsMountsShow(FILE*);
602
603	rtems_status_code
604	rtems_filesystem_resolve_location(char buf, int len, rtems_filesystem_location_info_t loc);
605
606
607	/*****************************************
608	Inline Routines
609	*****************************************/
610
611
612	/* * * * * * * * * * * * * * * * * *
613	Trivial Operations on a NfsNode
614	* * * * * * * * * * * * * * * * * */
615
616	/* determine if a location 'l' is an NFS root node */
617	static inline int
618	locIsRoot(rtems_filesystem_location_info_t *l)
619	{
620	NfsNode me = (NfsNode) l->node_access;
621	NfsNode r;
622	r = (NfsNode)l->mt_entry->mt_fs_root.node_access;
623	return SERP_ATTR(r).fileid == SERP_ATTR(me).fileid &&
624	SERP_ATTR(r).fsid == SERP_ATTR(me).fsid;
625	}
626
627	/* determine if a location 'l' is an NFS node */
628	static inline int
629	locIsNfs(rtems_filesystem_location_info_t *l)
630	{
631	return l->ops == &nfs_fs_ops;
632	}
633
634	/* determine if two locations refer to the
635	* same entity. We know that 'nfsloc' is a
636	* location inside nfs. However, we needn't
637	* know anything about 'anyloc'.
638	*/
639	static inline int
640	locAreEqual(
641	rtems_filesystem_location_info_t *nfsloc,
642	rtems_filesystem_location_info_t *anyloc
643	)
644	{
645	NfsNode na = (NfsNode) nfsloc->node_access;
646	NfsNode nb;
647
648	if (!locIsNfs(anyloc))
649	return 0;
650
651	nb = (NfsNode) anyloc->node_access;
652
653	if (na->nfs != nb->nfs)
654	return 0;
655
656	updateAttr(nb, 0);
657
658	return SERP_ATTR(na).fileid == SERP_ATTR(nb).fileid &&
659	SERP_ATTR(na).fsid == SERP_ATTR(nb).fsid;
660	}
661
662
663
664	/*****************************************
665	Global Variables
666	*****************************************/
667
668	/* These are (except for MAXNAMLEN/MAXPATHLEN) copied from IMFS */
669
670	static rtems_filesystem_limits_and_options_t
671	nfs_limits_and_options = {
672	5, /* link_max */
673	6, /* max_canon */
674	7, /* max_input */
675	NFS_MAXNAMLEN, /* name_max */
676	NFS_MAXPATHLEN, /* path_max */
677	2, /* pipe_buf */
678	1, /* posix_async_io */
679	2, /* posix_chown_restrictions */
680	3, /* posix_no_trunc */
681	4, /* posix_prio_io */
682	5, /* posix_sync_io */
683	6 /* posix_vdisable */
684	};
685
686	/* size of an encoded 'entry' object */
687	static int dirres_entry_size;
688
689	/* Global stuff and statistics */
690	static struct nfsstats {
691	/* A lock for protecting the
692	* linked ist of mounted NFS
693	* and the num_mounted_fs field
694	*/
695	rtems_id llock;
696	/* A lock for protecting misc
697	* stuff within the driver.
698	* The lock must only be held
699	* for short periods of time.
700	*/
701	rtems_id lock;
702	/* Our major number as assigned
703	* by RTEMS
704	*/
705	rtems_device_major_number nfs_major;
706	/* The number of currently
707	* mounted NFS
708	*/
709	int num_mounted_fs;
710	/* A list of the currently
711	* mounted NFS
712	*/
713	struct NfsRec_ *mounted_fs;
714	/* A counter for allocating
715	* unique IDs to each mounted
716	* NFS.
717	* Assume we are not going to
718	* do more than 16k mounts
719	* during the system lifetime
720	*/
721	u_short fs_ids;
722	} nfsGlob = {0, 0, 0, 0, 0, 0};
723
724	/*
725	* Global variable to tune the 'st_blksize' (stat(2)) value this nfs
726	* client should report.
727	* size on the server.
728	*/
729	#ifndef DEFAULT_NFS_ST_BLKSIZE
730	#define DEFAULT_NFS_ST_BLKSIZE NFS_MAXDATA
731	#endif
732	int nfsStBlksize = DEFAULT_NFS_ST_BLKSIZE;
733
734	/* Two pools of RPC transactions;
735	* One with small send buffers
736	* the other with a big one.
737	* The actual size of the small
738	* buffer is configurable (see top).
739	*
740	* Note: The RX buffers are always
741	* big
742	*/
743	static RpcUdpXactPool smallPool = 0;
744	static RpcUdpXactPool bigPool = 0;
745
746
747	/*****************************************
748	Implementation
749	*****************************************/
750
751	/* Create a Nfs object. This is
752	* per-mounted NFS information.
753	*
754	* ARGS: The Nfs server handle.
755	*
756	* RETURNS: Nfs on success,
757	* NULL on failure with
758	* errno set
759	*
760	* NOTE: The submitted server
761	* object is 'owned' by
762	* this Nfs and will be
763	* destroyed by nfsDestroy()
764	*/
765	static Nfs
766	nfsCreate(RpcUdpServer server)
767	{
768	Nfs rval = calloc(1,sizeof(*rval));
769
770	if (rval) {
771	rval->server = server;
772	LOCK(nfsGlob.llock);
773	rval->next = nfsGlob.mounted_fs;
774	nfsGlob.mounted_fs = rval;
775	UNLOCK(nfsGlob.llock);
776	} else {
777	errno = ENOMEM;
778	}
779	return rval;
780	}
781
782	/* Destroy an Nfs object and
783	* its associated server
784	*/
785	static void
786	nfsDestroy(Nfs nfs)
787	{
788	register Nfs prev;
789	if (!nfs)
790	return;
791
792	LOCK(nfsGlob.llock);
793	if (nfs == nfsGlob.mounted_fs)
794	nfsGlob.mounted_fs = nfs->next;
795	else {
796	for (prev = nfsGlob.mounted_fs;
797	prev && prev->next != nfs;
798	prev = prev->next)
799	/* nothing else to do */;
800	assert( prev );
801	prev->next = nfs->next;
802	}
803	UNLOCK(nfsGlob.llock);
804
805	nfs->next = 0; /* paranoia */
806	rpcUdpServerDestroy(nfs->server);
807	free(nfs);
808	}
809
810	/*
811	* Create a Node. The node will
812	* be associated with a particular
813	* mounted NFS identified by 'nfs'
814	* Optionally, a NFS file handle
815	* may be copied into this node.
816	*
817	* ARGS: nfs of the NFS this node
818	* belongs to.
819	* NFS file handle identifying
820	* this node.
821	* RETURNS: node on success,
822	* NULL on failure with errno
823	* set.
824	*
825	* NOTE: The caller of this routine
826	* is responsible for copying
827	* a NFS file handle if she
828	* choses to pass a NULL fh.
829	*
830	* The driver code assumes the
831	* a node always has a valid
832	* NFS filehandle and file
833	* attributes (unless the latter
834	* are aged).
835	*/
836	static NfsNode
837	nfsNodeCreate(Nfs nfs, fhandle *fh)
838	{
839	NfsNode rval = malloc(sizeof(*rval));
840	unsigned long flags;
841
842	#if DEBUG & DEBUG_TRACK_NODES
843	fprintf(stderr,"NFS: creating a node\n");
844	#endif
845
846	if (rval) {
847	if (fh)
848	memcpy( &SERP_FILE(rval), fh, sizeof(*fh) );
849	rtems_interrupt_disable(flags);
850	nfs->nodesInUse++;
851	rtems_interrupt_enable(flags);
852	rval->nfs = nfs;
853	rval->str = 0;
854	} else {
855	errno = ENOMEM;
856	}
857
858	return rval;
859	}
860
861	/* destroy a node */
862	static void
863	nfsNodeDestroy(NfsNode node)
864	{
865	unsigned long flags;
866
867	#if DEBUG & DEBUG_TRACK_NODES
868	fprintf(stderr,"NFS: destroying a node\n");
869	#endif
870	#if 0
871	if (!node)
872	return;
873	/* this probably does nothing... */
874	xdr_free(xdr_serporid, &node->serporid);
875	#endif
876
877	rtems_interrupt_disable(flags);
878	node->nfs->nodesInUse--;
879	#if DEBUG & DEBUG_COUNT_NODES
880	if (node->str)
881	node->nfs->stringsInUse--;
882	#endif
883	rtems_interrupt_enable(flags);
884
885	if (node->str)
886	free(node->str);
887
888	free(node);
889	}
890
891	/* Clone a given node (AKA copy constructor),
892	* i.e. create an exact copy.
893	*
894	* ARGS: node to clone
895	* RETURNS: new node on success
896	* NULL on failure with errno set.
897	*
898	* NOTE: a string attached to 'str'
899	* is cloned as well. Outdated
900	* attributes (of the new copy
901	* only) will be refreshed
902	* (if unsuccessful, this could
903	* be a reason for failure to
904	* clone a node).
905	*/
906	static NfsNode
907	nfsNodeClone(NfsNode node)
908	{
909	NfsNode rval = nfsNodeCreate(node->nfs, 0);
910
911	if (rval) {
912	rval = node;
913
914	/* must clone the string also */
915	if (node->str) {
916	rval->args.name = rval->str = strdup(node->str);
917	if (!rval->str) {
918	errno = ENOMEM;
919	nfsNodeDestroy(rval);
920	return 0;
921	}
922	#if DEBUG & DEBUG_COUNT_NODES
923	{ unsigned long flags;
924	rtems_interrupt_disable(flags);
925	node->nfs->stringsInUse++;
926	rtems_interrupt_enable(flags);
927	}
928	#endif
929	}
930
931	/* possibly update the stats */
932	if (updateAttr(rval, 0 /* only if necessary */)) {
933	nfsNodeDestroy(rval);
934	return 0;
935	}
936	}
937	return rval;
938	}
939
940	/* Initialize the driver.
941	*
942	* ARGS: depth of the small and big
943	* transaction pools, i.e. how
944	* many transactions (buffers)
945	* should always be kept around.
946	*
947	* (If more transactions are needed,
948	* they are created and destroyed
949	* on the fly).
950	*/
951	void
952	nfsInit(int smallPoolDepth, int bigPoolDepth)
953	{
954	static int initialised = 0;
955	entry dummy;
956	rtems_status_code status;
957
958	if (initialised)
959	return;
960
961	initialised = 1;
962
963	fprintf(stderr,
964	"RTEMS-NFS $Release$, " \
965	"Till Straumann, Stanford/SLAC/SSRL 2002, " \
966	"See LICENSE file for licensing info.\n");
967
968	/* Get a major number */
969
970	if (RTEMS_SUCCESSFUL != rtems_io_register_driver(0, &drvNfs, &nfsGlob.nfs_major)) {
971	fprintf(stderr,"Registering NFS driver failed - %s\n", strerror(errno));
972	return;
973	}
974
975	if (0==smallPoolDepth)
976	smallPoolDepth = 20;
977	if (0==bigPoolDepth)
978	bigPoolDepth = 10;
979
980	/* it's crucial to zero out the 'next' pointer
981	* because it terminates the xdr_entry recursion
982	*
983	* we also must make the filename some non-zero
984	* char pointer!
985	*/
986
987	memset(&dummy, 0, sizeof(dummy));
988
989	dummy.nextentry = 0;
990	dummy.name = "somename"; /* guess average length of a filename */
991	dirres_entry_size = xdr_sizeof((xdrproc_t)xdr_entry, &dummy);
992
993	smallPool = rpcUdpXactPoolCreate(
994	NFS_PROGRAM,
995	NFS_VERSION_2,
996	CONFIG_NFS_SMALL_XACT_SIZE,
997	smallPoolDepth);
998	assert( smallPool );
999
1000	bigPool = rpcUdpXactPoolCreate(
1001	NFS_PROGRAM,
1002	NFS_VERSION_2,
1003	CONFIG_NFS_BIG_XACT_SIZE,
1004	bigPoolDepth);
1005	assert( bigPool );
1006
1007	status = rtems_semaphore_create(
1008	rtems_build_name('N','F','S','l'),
1009	1,
1010	MUTEX_ATTRIBUTES,
1011	0,
1012	&nfsGlob.llock);
1013	assert( status == RTEMS_SUCCESSFUL );
1014	status = rtems_semaphore_create(
1015	rtems_build_name('N','F','S','m'),
1016	1,
1017	MUTEX_ATTRIBUTES,
1018	0,
1019	&nfsGlob.lock);
1020	assert( status == RTEMS_SUCCESSFUL );
1021
1022	if (sizeof(ino_t) < sizeof(u_int)) {
1023	fprintf(stderr,
1024	"WARNING: Using 'short st_ino' hits performance and may fail to access/find correct files\n");
1025	fprintf(stderr,
1026	"you should fix newlib's sys/stat.h - for now I'll enable a hack...\n");
1027
1028	}
1029	}
1030
1031	/* Driver cleanup code
1032	*/
1033	int
1034	nfsCleanup(void)
1035	{
1036	rtems_id l;
1037	int refuse;
1038
1039	if (!nfsGlob.llock) {
1040	/* registering the driver failed - let them still cleanup */
1041	return 0;
1042	}
1043
1044	LOCK(nfsGlob.llock);
1045	if ( (refuse = nfsGlob.num_mounted_fs) ) {
1046	fprintf(stderr,"Refuse to unload NFS; %i filesystems still mounted.\n",
1047	refuse);
1048	nfsMountsShow(stderr);
1049	/* yes, printing is slow - but since you try to unload the driver,
1050	* you assume nobody is using NFS, so what if they have to wait?
1051	*/
1052	UNLOCK(nfsGlob.llock);
1053	return -1;
1054	}
1055
1056	rtems_semaphore_delete(nfsGlob.lock);
1057	nfsGlob.lock = 0;
1058
1059	/* hold the lock while cleaning up... */
1060
1061	rpcUdpXactPoolDestroy(smallPool);
1062	rpcUdpXactPoolDestroy(bigPool);
1063	l = nfsGlob.llock;
1064	rtems_io_unregister_driver(nfsGlob.nfs_major);
1065
1066	rtems_semaphore_delete(l);
1067	nfsGlob.llock = 0;
1068	return 0;
1069	}
1070
1071	/* NFS RPC wrapper.
1072	*
1073	* ARGS: srvr the NFS server we want to call
1074	* proc the NFSPROC_xx we want to invoke
1075	* xargs xdr routine to wrap the arguments
1076	* pargs pointer to the argument object
1077	* xres xdr routine to unwrap the results
1078	* pres pointer to the result object
1079	*
1080	* RETURNS: 0 on success, -1 on error with errno set.
1081	*
1082	* NOTE: the caller assumes that errno is set to
1083	* a nonzero value if this routine returns
1084	* an error (nonzero return value).
1085	*
1086	* This routine prints RPC error messages to
1087	* stderr.
1088	*/
1089	STATIC int
1090	nfscall(
1091	RpcUdpServer srvr,
1092	int proc,
1093	xdrproc_t xargs,
1094	void * pargs,
1095	xdrproc_t xres,
1096	void * pres)
1097	{
1098	RpcUdpXact xact;
1099	enum clnt_stat stat;
1100	RpcUdpXactPool pool;
1101	int rval = -1;
1102
1103
1104	switch (proc) {
1105	case NFSPROC_SYMLINK:
1106	case NFSPROC_WRITE:
1107	pool = bigPool; break;
1108	default: pool = smallPool; break;
1109	}
1110
1111	xact = rpcUdpXactPoolGet(pool, XactGetCreate);
1112
1113	if ( !xact ) {
1114	errno = ENOMEM;
1115	return -1;
1116	}
1117
1118	if ( RPC_SUCCESS != (stat=rpcUdpSend(
1119	xact,
1120	srvr,
1121	NFSCALL_TIMEOUT,
1122	proc,
1123	xres,
1124	pres,
1125	xargs,
1126	pargs,
1127	0)) \|\|
1128	RPC_SUCCESS != (stat=rpcUdpRcv(xact)) ) {
1129
1130	fprintf(stderr,
1131	"NFS (proc %i) - %s\n",
1132	proc,
1133	clnt_sperrno(stat));
1134
1135	switch (stat) {
1136	/* TODO: this is probably not complete and/or fully accurate */
1137	case RPC_CANTENCODEARGS : errno = EINVAL; break;
1138	case RPC_AUTHERROR : errno = EPERM; break;
1139
1140	case RPC_CANTSEND :
1141	case RPC_CANTRECV : /* hope they have errno set */
1142	case RPC_SYSTEMERROR : break;
1143
1144	default : errno = EIO; break;
1145	}
1146	} else {
1147	rval = 0;
1148	}
1149
1150	/* release the transaction back into the pool */
1151	rpcUdpXactPoolPut(xact);
1152
1153	if (rval && !errno)
1154	errno = EIO;
1155
1156	return rval;
1157	}
1158
1159	/* Check the 'age' of a node's stats
1160	* and read the attributes from the server
1161	* if necessary.
1162	*
1163	* ARGS: node node to update
1164	* force enforce updating ignoring
1165	* the timestamp/age
1166	*
1167	* RETURNS: 0 on success,
1168	* -1 on failure with errno set
1169	*/
1170
1171	static int
1172	updateAttr(NfsNode node, int force)
1173	{
1174
1175	if (force
1176	#ifdef CONFIG_ATTR_LIFETIME
1177	\|\| (nowSeconds() - node->age > CONFIG_ATTR_LIFETIME)
1178	#endif
1179	) {
1180	if ( nfscall(node->nfs->server,
1181	NFSPROC_GETATTR,
1182	(xdrproc_t)xdr_nfs_fh, &SERP_FILE(node),
1183	(xdrproc_t)xdr_attrstat, &node->serporid) )
1184	return -1;
1185
1186	if ( NFS_OK != node->serporid.status ) {
1187	errno = node->serporid.status;
1188	return -1;
1189	}
1190
1191	node->age = nowSeconds();
1192	}
1193
1194	return 0;
1195	}
1196
1197	/*
1198	* IP address helper.
1199	*
1200	* initialize a sockaddr_in from a
1201	* [<uid>'.'<gid>'@']<host>':'<path>" string and let
1202	* pPath point to the <path> part; retrieve the optional
1203	* uid/gids
1204	*
1205	* ARGS: see description above
1206	*
1207	* RETURNS: 0 on success,
1208	* -1 on failure with errno set
1209	*/
1210	static int
1211	buildIpAddr(u_long puid, u_long pgid,
1212	char *pHost, struct sockaddr_in psa,
1213	char **pPath)
1214	{
1215	struct hostent *h;
1216	char host[64];
1217	char chpt = pPath;
1218	char *path;
1219	int len;
1220
1221	if ( !chpt ) {
1222	errno = EINVAL;
1223	return -1;
1224	}
1225
1226	/* look for the optional uid/gid */
1227	if ( (chpt = strchr(chpt, UIDSEP)) ) {
1228	if ( 2 != sscanf(*pPath,"%li.%li",puid,pgid) ) {
1229	errno = EINVAL;
1230	return -1;
1231	}
1232	chpt++;
1233	} else {
1234	*puid = RPCIOD_DEFAULT_ID;
1235	*pgid = RPCIOD_DEFAULT_ID;
1236	chpt = *pPath;
1237	}
1238	if ( pHost )
1239	*pHost = chpt;
1240
1241	/* split the device name which is in the form
1242	*
1243	* <host> ':' <path>
1244	*
1245	* into its components using a local buffer
1246	*/
1247
1248	if ( !(path = strchr(chpt, HOSTDELIM)) \|\|
1249	(len = path - chpt) >= sizeof(host) - 1 ) {
1250	errno = EINVAL;
1251	return -1;
1252	}
1253	/* point to path beyond ':' */
1254	path++;
1255
1256	strncpy(host, chpt, len);
1257	host[len]=0;
1258
1259	/* BEGIN OF NON-THREAD SAFE REGION */
1260
1261	h = gethostbyname(host);
1262
1263	if ( !h ) {
1264	errno = EINVAL;
1265	return -1;
1266	}
1267
1268	memcpy(&psa->sin_addr, h->h_addr, sizeof (struct in_addr));
1269
1270	/* END OF NON-THREAD SAFE REGION */
1271
1272	psa->sin_family = AF_INET;
1273	psa->sin_port = 0;
1274	*pPath = path;
1275	return 0;
1276	}
1277
1278	/* wrapper similar to nfscall.
1279	* However, since it is not used
1280	* very often, the simpler and less
1281	* efficient rpcUdpCallRp API is used.
1282	*
1283	* ARGS: see 'nfscall()' above
1284	*
1285	* RETURNS: RPC status
1286	*/
1287	static enum clnt_stat
1288	mntcall(
1289	struct sockaddr_in *psrvr,
1290	int proc,
1291	xdrproc_t xargs,
1292	void * pargs,
1293	xdrproc_t xres,
1294	void * pres,
1295	u_long uid,
1296	u_long gid)
1297	{
1298	#ifdef MOUNT_V1_PORT
1299	int retry;
1300	#endif
1301	enum clnt_stat stat = RPC_FAILED;
1302
1303	#ifdef MOUNT_V1_PORT
1304	/* if the portmapper fails, retry a fixed port */
1305	for (retry = 1, psrvr->sin_port = 0, stat = RPC_FAILED;
1306	retry >= 0 && stat;
1307	stat && (psrvr->sin_port = htons(MOUNT_V1_PORT)), retry-- )
1308	#endif
1309	stat = rpcUdpCallRp(
1310	psrvr,
1311	MOUNTPROG,
1312	MOUNTVERS,
1313	proc,
1314	xargs,
1315	pargs,
1316	xres,
1317	pres,
1318	uid,
1319	gid,
1320	MNTCALL_TIMEOUT
1321	);
1322	return stat;
1323	}
1324
1325	/*****************************************
1326	RTEMS File System Operations for NFS
1327	*****************************************/
1328
1329	#if 0 /* for reference */
1330
1331	struct rtems_filesystem_location_info_tt
1332	{
1333	void *node_access;
1334	rtems_filesystem_file_handlers_r *handlers;
1335	rtems_filesystem_operations_table *ops;
1336	rtems_filesystem_mount_table_entry_t *mt_entry;
1337	};
1338
1339	#endif
1340
1341	/*
1342	* Evaluate a path letting 'pathloc' travel along.
1343	*
1344	* The important semantics of this operation are:
1345	*
1346	* If this routine returns -1, the caller assumes
1347	* pathloc to be _invalid_ and hence it will not
1348	* invoke rtems_filesystem_freenode() on it.
1349	*
1350	* OTOH, if evalpath returns 0,
1351	* rtems_filesystem_freenode() will eventually be
1352	* called which results in our freeing the associated
1353	* NfsNode attached to node_access.
1354	*
1355	* Therefore, this routine will _always_ allocate
1356	* a NfsNode and pass it out to *pathloc (provided
1357	* that the evaluation succeeds).
1358	*
1359	* However, if the evaluation finds that it has to
1360	* step across FS boundaries (mount point or a symlink
1361	* pointing outside), the NfsNode is destroyed
1362	* before passing control to the new FS' evalpath_h()
1363	*
1364	*/
1365
1366	union nfs_evalpath_arg {
1367	int i;
1368	const char **c;
1369	};
1370
1371	STATIC int nfs_do_evalpath(
1372	const char pathname, / IN */
1373	int pathnamelen, /* IN */
1374	union nfs_evalpath_arg *arg,
1375	rtems_filesystem_location_info_t pathloc, / IN/OUT */
1376	int forMake
1377	)
1378	{
1379	char del = 0, part;
1380	int e = 0;
1381	NfsNode node = pathloc->node_access;
1382	char *p = malloc(MAXPATHLEN+1);
1383	Nfs nfs = (Nfs)pathloc->mt_entry->fs_info;
1384	RpcUdpServer server = nfs->server;
1385	unsigned long flags;
1386	#if DEBUG & DEBUG_COUNT_NODES
1387	unsigned long niu,siu;
1388	#endif
1389
1390	if ( !p ) {
1391	e = ENOMEM;
1392	goto cleanup;
1393	}
1394	memset(p, 0, MAXPATHLEN+1);
1395	memcpy(p, pathname, pathnamelen);
1396
1397	LOCK(nfsGlob.lock);
1398	node = nfsNodeClone(node);
1399	UNLOCK(nfsGlob.lock);
1400
1401	/* from here on, the NFS is protected from being unmounted
1402	* since the node refcount is > 1
1403	*/
1404
1405	/* clone the node */
1406	if ( !node ) {
1407	/* nodeClone sets errno */
1408	pathloc->node_access = 0;
1409	if ( ! (e = errno) ) {
1410	/* if we have no node, e must not be zero! */
1411	e = ENOMEM;
1412	}
1413	goto cleanup;
1414	}
1415
1416	pathloc->node_access = node;
1417
1418	/* Special case: the RTEMS filesystem code
1419	* may emit '..' on a regular file node to
1420	* find the parent directory :-(.
1421	* (eval.c: rtems_filesystem_evaluate_parent())
1422	* Try to catch this case here:
1423	*/
1424	if ( NFDIR != SERP_ATTR(node).type && '.'==p && '.'==(p+1) ) {
1425	for ( part = p+2; '/'==*part; part++ )
1426	/* skip trailing '/' */;
1427	if ( !*part ) {
1428	/* this is it; back out dir and let them look up the dir itself... */
1429	memcpy( &SERP_FILE(node),
1430	&node->args.dir,
1431	sizeof(node->args.dir));
1432	*(p+1)=0;
1433	}
1434	}
1435
1436	for (part=p; part && *part; part=del) {
1437
1438	if ( NFLNK == SERP_ATTR(node).type ) {
1439	/* follow midpath link */
1440	char *b = malloc(NFS_MAXPATHLEN+1);
1441	int l;
1442
1443	if (!b) {
1444	e = ENOMEM;
1445	goto cleanup;
1446	}
1447	if (nfs_readlink(pathloc, b, NFS_MAXPATHLEN+1)) {
1448	free(b);
1449	e = errno;
1450	goto cleanup;
1451	}
1452
1453	/* prepend the link value to the rest of the path */
1454	if ( (l=strlen(b)) + strlen(part) + 1 > NFS_MAXPATHLEN ) {
1455	free(b);
1456	e = EINVAL;
1457	goto cleanup;
1458	}
1459	/* swap string buffers and reset delimiter */
1460	b[l++] = DELIM;
1461	strcpy(b+l,part);
1462	part = b;
1463	b = p;
1464	p = del = part;
1465
1466	free(b);
1467
1468	/* back up the directory filehandle (only necessary
1469	* if we don't back out to the root
1470	*/
1471	if (! (DELIM == *part) ) {
1472	memcpy( &SERP_FILE(node),
1473	&node->args.dir,
1474	sizeof(node->args.dir));
1475
1476	if (updateAttr(node, 1 /* force */)) {
1477	e = errno;
1478	goto cleanup;
1479	}
1480	}
1481	}
1482
1483	/* find delimiter and eat /// sequences
1484	* (only if we don't restart at the root)
1485	*/
1486	if ( DELIM != *part && (del = strchr(part, DELIM))) {
1487	do {
1488	*del++=0;
1489	} while (DELIM==*del);
1490	}
1491
1492	/* refuse to backup over the root */
1493	if ( 0==strcmp(part,UPDIR)
1494	&& locAreEqual(pathloc, &rtems_filesystem_root) ) {
1495	part++;
1496	}
1497
1498	/* cross mountpoint upwards */
1499	if ( (0==strcmp(part,UPDIR) && locIsRoot(pathloc)) /* cross mountpoint up */
1500	\|\| DELIM == part / link starts at root */
1501	) {
1502	int rval;
1503
1504	#if DEBUG & DEBUG_EVALPATH
1505	fprintf(stderr,
1506	"Crossing mountpoint upwards\n");
1507	#endif
1508
1509	if (DELIM == *part) {
1510	*pathloc = rtems_filesystem_root;
1511	} else {
1512	*pathloc = pathloc->mt_entry->mt_point_node;
1513	/* re-append the rest of the path */
1514	if (del)
1515	while ( 0 == *--del )
1516	*del = DELIM;
1517	}
1518
1519	nfsNodeDestroy(node);
1520
1521	#if DEBUG & DEBUG_EVALPATH
1522	fprintf(stderr,
1523	"Re-evaluating '%s'\n",
1524	part);
1525	#endif
1526
1527	if (forMake)
1528	rval = pathloc->ops->evalformake_h(part, pathloc, arg->c);
1529	else
1530	rval = pathloc->ops->evalpath_h(part, strlen(part), arg->i, pathloc);
1531
1532	free(p);
1533	return rval;
1534	}
1535
1536	/* lookup one element */
1537	SERP_ARGS(node).diroparg.name = part;
1538
1539	/* remember args / directory fh */
1540	memcpy( &node->args, &SERP_FILE(node), sizeof(node->args));
1541
1542	/* don't lookup the item we want to create */
1543	if ( forMake && (!del \|\| !*del) )
1544	break;
1545
1546	#if DEBUG & DEBUG_EVALPATH
1547	fprintf(stderr,"Looking up '%s'\n",part);
1548	#endif
1549
1550	if ( nfscall(server,
1551	NFSPROC_LOOKUP,
1552	(xdrproc_t)xdr_diropargs, &SERP_FILE(node),
1553	(xdrproc_t)xdr_serporid, &node->serporid) \|\|
1554	NFS_OK != (errno=node->serporid.status) ) {
1555	e = errno;
1556	goto cleanup;
1557	}
1558	node->age = nowSeconds();
1559
1560	#if DEBUG & DEBUG_EVALPATH
1561	if (NFLNK == SERP_ATTR(node).type && del) {
1562	fprintf(stderr,
1563	"Following midpath link '%s'\n",
1564	part);
1565	}
1566	#endif
1567
1568	}
1569
1570	if (forMake) {
1571	/* remember the name - do this _before_ copying
1572	* the name to local storage; the caller expects a
1573	* pointer into pathloc
1574	*/
1575	assert( node->args.name );
1576
1577	(const char*)arg = pathname + (node->args.name - p);
1578
1579	#if 0
1580	/* restore the directory node */
1581
1582	memcpy( &SERP_FILE(node),
1583	&node->args.dir,
1584	sizeof(node->args.dir));
1585
1586	if ( (nfscall(nfs->server,
1587	NFSPROC_GETATTR,
1588	(xdrproc_t)xdr_nfs_fh, &SERP_FILE(node),
1589	(xdrproc_t)xdr_attrstat, &node->serporid) && !errno && (errno = EIO)) \|\|
1590	(NFS_OK != (errno=node->serporid.status) ) ) {
1591	goto cleanup;
1592	}
1593	#endif
1594	}
1595
1596	if (locIsRoot(pathloc)) {
1597
1598	/* stupid filesystem code has no 'op' for comparing nodes
1599	* but just compares the 'node_access' pointers.
1600	* Luckily, this is only done for comparing the root nodes.
1601	* Hence, we never give them a copy of the root but always
1602	* the root itself.
1603	*/
1604	pathloc->node_access = pathloc->mt_entry->mt_fs_root.node_access;
1605	/* increment the 'in use' counter since we return one more
1606	* reference to the root node
1607	*/
1608	rtems_interrupt_disable(flags);
1609	nfs->nodesInUse++;
1610	rtems_interrupt_enable(flags);
1611	nfsNodeDestroy(node);
1612
1613
1614	} else {
1615	switch (SERP_ATTR(node).type) {
1616	case NFDIR: pathloc->handlers = &nfs_dir_file_handlers; break;
1617	case NFREG: pathloc->handlers = &nfs_file_file_handlers; break;
1618	case NFLNK: pathloc->handlers = &nfs_link_file_handlers; break;
1619	default: pathloc->handlers = &rtems_filesystem_handlers_default; break;
1620	}
1621	pathloc->node_access = node;
1622
1623	/* remember the name of this directory entry */
1624
1625	if (node->args.name) {
1626	if (node->str) {
1627	#if DEBUG & DEBUG_COUNT_NODES
1628	rtems_interrupt_disable(flags);
1629	nfs->stringsInUse--;
1630	rtems_interrupt_enable(flags);
1631	#endif
1632	free(node->str);
1633	}
1634	node->args.name = node->str = strdup(node->args.name);
1635	if (!node->str) {
1636	e = ENOMEM;
1637	goto cleanup;
1638	}
1639
1640	#if DEBUG & DEBUG_COUNT_NODES
1641	rtems_interrupt_disable(flags);
1642	nfs->stringsInUse++;
1643	rtems_interrupt_enable(flags);
1644	#endif
1645	}
1646
1647	}
1648	node = 0;
1649
1650	e = 0;
1651
1652	cleanup:
1653	free(p);
1654	#if DEBUG & DEBUG_COUNT_NODES
1655	/* cache counters; nfs may be unmounted by other thread after the last
1656	* node is destroyed
1657	*/
1658	niu = nfs->nodesInUse;
1659	siu = nfs->stringsInUse;
1660	#endif
1661	if (node) {
1662	nfsNodeDestroy(node);
1663	pathloc->node_access = 0;
1664	}
1665	#if DEBUG & DEBUG_COUNT_NODES
1666	fprintf(stderr,
1667	"leaving evalpath, in use count is %i nodes, %i strings\n",
1668	niu,siu);
1669	#endif
1670	if (e) {
1671	#if DEBUG & DEBUG_EVALPATH
1672	perror("Evalpath");
1673	#endif
1674	rtems_set_errno_and_return_minus_one(e);
1675	} else {
1676	return 0;
1677	}
1678	}
1679
1680	/* MANDATORY; may set errno=ENOSYS and return -1 */
1681	static int nfs_evalformake(
1682	const char path, / IN */
1683	rtems_filesystem_location_info_t pathloc, / IN/OUT */
1684	const char *pname / OUT */
1685	)
1686	{
1687	union nfs_evalpath_arg args;
1688	args.c = pname;
1689
1690	return nfs_do_evalpath(path, strlen(path), &args, pathloc, 1 /forMake/);
1691	}
1692
1693	static int nfs_evalpath(
1694	const char path, / IN */
1695	size_t pathlen, /* IN */
1696	int flags, /* IN */
1697	rtems_filesystem_location_info_t pathloc / IN/OUT */
1698	)
1699	{
1700	union nfs_evalpath_arg args;
1701	args.i = flags;
1702	return nfs_do_evalpath(path, pathlen, &args, pathloc, 0 /not forMake/);
1703	}
1704
1705
1706	/* create a hard link */
1707
1708	static int nfs_link(
1709	rtems_filesystem_location_info_t to_loc, / IN */
1710	rtems_filesystem_location_info_t parent_loc, / IN */
1711	const char name / IN */
1712	)
1713	{
1714	NfsNode pNode;
1715	nfsstat status;
1716	NfsNode tNode = to_loc->node_access;
1717
1718	#if DEBUG & DEBUG_SYSCALLS
1719	fprintf(stderr,"Creating link '%s'\n",name);
1720	#endif
1721
1722	if ( !locIsNfs(parent_loc) ) {
1723	errno = EXDEV;
1724	return -1;
1725	}
1726
1727	pNode = parent_loc->node_access;
1728	if ( tNode->nfs != pNode->nfs ) {
1729	errno = EXDEV;
1730	return -1;
1731	}
1732	memcpy(&SERP_ARGS(tNode).linkarg.to.dir,
1733	&SERP_FILE(pNode),
1734	sizeof(SERP_FILE(pNode)));
1735
1736	SERP_ARGS(tNode).linkarg.to.name = (filename)name;
1737
1738	if ( nfscall(tNode->nfs->server,
1739	NFSPROC_LINK,
1740	(xdrproc_t)xdr_linkargs, &SERP_FILE(tNode),
1741	(xdrproc_t)xdr_nfsstat, &status)
1742	\|\| (NFS_OK != (errno = status))
1743	) {
1744	#if DEBUG & DEBUG_SYSCALLS
1745	perror("nfs_link");
1746	#endif
1747	return -1;
1748	}
1749
1750	return 0;
1751
1752	}
1753
1754	static int nfs_do_unlink(
1755	rtems_filesystem_location_info_t parent_loc,/ IN */
1756	rtems_filesystem_location_info_t loc, / IN */
1757	int proc
1758	)
1759	{
1760	nfsstat status;
1761	NfsNode node = loc->node_access;
1762	Nfs nfs = node->nfs;
1763	#if DEBUG & DEBUG_SYSCALLS
1764	char *name = NFSPROC_REMOVE == proc ?
1765	"nfs_unlink" : "nfs_rmdir";
1766	#endif
1767
1768	/* The FS generics have determined that pathloc is _not_
1769	* a directory. Hence we may assume that the parent
1770	* is in our NFS.
1771	*/
1772
1773	#if DEBUG & DEBUG_SYSCALLS
1774	assert( node->args.name == node->str && node->str );
1775
1776	fprintf(stderr,"%s '%s'\n", name, node->args.name);
1777	#endif
1778
1779	if ( nfscall(nfs->server,
1780	proc,
1781	(xdrproc_t)xdr_diropargs, &node->args,
1782	(xdrproc_t)xdr_nfsstat, &status)
1783	\|\| (NFS_OK != (errno = status))
1784	) {
1785	#if DEBUG & DEBUG_SYSCALLS
1786	perror(name);
1787	#endif
1788	return -1;
1789	}
1790
1791	return 0;
1792	}
1793
1794	static int nfs_unlink(
1795	rtems_filesystem_location_info_t parent_loc, / IN */
1796	rtems_filesystem_location_info_t loc / IN */
1797	)
1798	{
1799	return nfs_do_unlink(parent_loc, loc, NFSPROC_REMOVE);
1800	}
1801
1802	static int nfs_chown(
1803	rtems_filesystem_location_info_t pathloc, / IN */
1804	uid_t owner, /* IN */
1805	gid_t group /* IN */
1806	)
1807	{
1808	sattr arg;
1809
1810	arg.uid = owner;
1811	arg.gid = group;
1812
1813	return nfs_sattr(pathloc->node_access, &arg, SATTR_UID \| SATTR_GID);
1814
1815	}
1816
1817	/* Cleanup the FS private info attached to pathloc->node_access */
1818	static int nfs_freenode(
1819	rtems_filesystem_location_info_t pathloc / IN */
1820	)
1821	{
1822	Nfs nfs = ((NfsNode)pathloc->node_access)->nfs;
1823
1824	#if DEBUG & DEBUG_COUNT_NODES
1825	/* print counts at entry where they are > 0 so 'nfs' is safe from being destroyed
1826	* and there's no race condition
1827	*/
1828	fprintf(stderr,
1829	"entering freenode, in use count is %i nodes, %i strings\n",
1830	nfs->nodesInUse,
1831	nfs->stringsInUse);
1832	#endif
1833
1834	/* never destroy the root node; it is released by the unmount
1835	* code
1836	*/
1837	if (locIsRoot(pathloc)) {
1838	unsigned long flags;
1839	/* just adjust the references to the root node but
1840	* don't really release it
1841	*/
1842	rtems_interrupt_disable(flags);
1843	nfs->nodesInUse--;
1844	rtems_interrupt_enable(flags);
1845	} else {
1846	nfsNodeDestroy(pathloc->node_access);
1847	pathloc->node_access = 0;
1848	}
1849	return 0;
1850	}
1851
1852	/* NOTE/TODO: mounting on top of NFS is not currently supported
1853	*
1854	* Challenge: stateless protocol. It would be possible to
1855	* delete mount points on the server. We would need some sort
1856	* of a 'garbage collector' looking for dead/unreachable
1857	* mount points and unmounting them.
1858	* Also, the path evaluation routine would have to check
1859	* for crossing mount points. Crossing over from one NFS
1860	* into another NFS could probably handled iteratively
1861	* rather than by recursion.
1862	*/
1863
1864	int rtems_nfs_initialize(
1865	rtems_filesystem_mount_table_entry_t *mt_entry,
1866	const void *data
1867	)
1868	{
1869	char *host;
1870	struct sockaddr_in saddr;
1871	enum clnt_stat stat;
1872	fhstatus fhstat;
1873	u_long uid,gid;
1874	#ifdef NFS_V2_PORT
1875	int retry;
1876	#endif
1877	Nfs nfs = 0;
1878	NfsNode rootNode = 0;
1879	RpcUdpServer nfsServer = 0;
1880	int e = -1;
1881	char *path = mt_entry->dev;
1882
1883	if (rpcUdpInit () < 0) {
1884	fprintf (stderr, "error: initialising RPC\n");
1885	return -1;
1886	}
1887
1888	nfsInit(0, 0);
1889
1890	#if 0
1891	printf("Trying to mount %s on %s\n",path,mntpoint);
1892	#endif
1893
1894	if ( buildIpAddr(&uid, &gid, &host, &saddr, &path) )
1895	return -1;
1896
1897	#ifdef NFS_V2_PORT
1898	/* if the portmapper fails, retry a fixed port */
1899	for (retry = 1, saddr.sin_port = 0, stat = RPC_FAILED;
1900	retry >= 0 && stat;
1901	stat && (saddr.sin_port = htons(NFS_V2_PORT)), retry-- )
1902	#endif
1903	stat = rpcUdpServerCreate(
1904	&saddr,
1905	NFS_PROGRAM,
1906	NFS_VERSION_2,
1907	uid,
1908	gid,
1909	&nfsServer
1910	);
1911
1912	if ( RPC_SUCCESS != stat ) {
1913	fprintf(stderr,
1914	"Unable to contact NFS server - invalid port? (%s)\n",
1915	clnt_sperrno(stat));
1916	e = EPROTONOSUPPORT;
1917	goto cleanup;
1918	}
1919
1920
1921	/* first, try to ping the NFS server by
1922	* calling the NULL proc.
1923	*/
1924	if ( nfscall(nfsServer,
1925	NFSPROC_NULL,
1926	(xdrproc_t)xdr_void, 0,
1927	(xdrproc_t)xdr_void, 0) ) {
1928
1929	fputs("NFS Ping ",stderr);
1930	fwrite(host, 1, path-host-1, stderr);
1931	fprintf(stderr," failed: %s\n", strerror(errno));
1932
1933	e = errno ? errno : EIO;
1934	goto cleanup;
1935	}
1936
1937	/* that seemed to work - we now try the
1938	* actual mount
1939	*/
1940
1941	/* reuse server address but let the mntcall()
1942	* search for the mountd's port
1943	*/
1944	saddr.sin_port = 0;
1945
1946	stat = mntcall( &saddr,
1947	MOUNTPROC_MNT,
1948	(xdrproc_t)xdr_dirpath,
1949	&path,
1950	(xdrproc_t)xdr_fhstatus,
1951	&fhstat,
1952	uid,
1953	gid );
1954
1955	if (stat) {
1956	fprintf(stderr,"MOUNT -- %s\n",clnt_sperrno(stat));
1957	if ( e<=0 )
1958	e = EIO;
1959	goto cleanup;
1960	} else if (NFS_OK != (e=fhstat.fhs_status)) {
1961	fprintf(stderr,"MOUNT: %s\n",strerror(e));
1962	goto cleanup;
1963	}
1964
1965	nfs = nfsCreate(nfsServer);
1966	assert( nfs );
1967	nfsServer = 0;
1968
1969	nfs->uid = uid;
1970	nfs->gid = gid;
1971
1972	/* that seemed to work - we now create the root node
1973	* and we also must obtain the root node attributes
1974	*/
1975	rootNode = nfsNodeCreate(nfs, &fhstat.fhstatus_u.fhs_fhandle);
1976	assert( rootNode );
1977
1978	if ( updateAttr(rootNode, 1 /* force */) ) {
1979	e = errno;
1980	goto cleanup;
1981	}
1982
1983	/* looks good so far */
1984
1985	mt_entry->mt_fs_root.node_access = rootNode;
1986
1987	rootNode = 0;
1988
1989	mt_entry->mt_fs_root.ops = &nfs_fs_ops;
1990	mt_entry->mt_fs_root.handlers = &nfs_dir_file_handlers;
1991	mt_entry->pathconf_limits_and_options = nfs_limits_and_options;
1992
1993	LOCK(nfsGlob.llock);
1994	nfsGlob.num_mounted_fs++;
1995	/* allocate a new ID for this FS */
1996	nfs->id = nfsGlob.fs_ids++;
1997	UNLOCK(nfsGlob.llock);
1998
1999	mt_entry->fs_info = nfs;
2000	nfs->mt_entry = mt_entry;
2001	nfs = 0;
2002
2003	e = 0;
2004
2005	cleanup:
2006	if (nfs)
2007	nfsDestroy(nfs);
2008	if (nfsServer)
2009	rpcUdpServerDestroy(nfsServer);
2010	if (rootNode)
2011	nfsNodeDestroy(rootNode);
2012	if (e)
2013	rtems_set_errno_and_return_minus_one(e);
2014	else
2015	return 0;
2016	}
2017
2018	/* This op is called when they try to unmount THIS fs */
2019	STATIC int nfs_fsunmount_me(
2020	rtems_filesystem_mount_table_entry_t mt_entry / in */
2021	)
2022	{
2023	enum clnt_stat stat;
2024	struct sockaddr_in saddr;
2025	char *path = mt_entry->dev;
2026	int nodesInUse;
2027	u_long uid,gid;
2028	int status;
2029
2030	LOCK(nfsGlob.llock);
2031	nodesInUse = ((Nfs)mt_entry->fs_info)->nodesInUse;
2032
2033	if (nodesInUse > 1 /* one ref to the root node used by us */) {
2034	UNLOCK(nfsGlob.llock);
2035	fprintf(stderr,
2036	"Refuse to unmount; there are still %i nodes in use (1 used by us)\n",
2037	nodesInUse);
2038	rtems_set_errno_and_return_minus_one(EBUSY);
2039	}
2040
2041	status = buildIpAddr(&uid, &gid, 0, &saddr, &path);
2042	assert( !status );
2043
2044	stat = mntcall( &saddr,
2045	MOUNTPROC_UMNT,
2046	(xdrproc_t)xdr_dirpath, &path,
2047	(xdrproc_t)xdr_void, 0,
2048	uid,
2049	gid
2050	);
2051
2052	if (stat) {
2053	UNLOCK(nfsGlob.llock);
2054	fprintf(stderr,"NFS UMOUNT -- %s\n", clnt_sperrno(stat));
2055	errno = EIO;
2056	return -1;
2057	}
2058
2059	nfsNodeDestroy(mt_entry->mt_fs_root.node_access);
2060	mt_entry->mt_fs_root.node_access = 0;
2061
2062	nfsDestroy(mt_entry->fs_info);
2063	mt_entry->fs_info = 0;
2064
2065	nfsGlob.num_mounted_fs--;
2066	UNLOCK(nfsGlob.llock);
2067
2068	return 0;
2069	}
2070
2071	/* OPTIONAL; may be NULL - BUT: CAUTION; mount() doesn't check
2072	* for this handler to be present - a fs bug
2073	* //NOTE: (10/25/2002) patch submitted and probably applied
2074	*/
2075	static rtems_filesystem_node_types_t nfs_node_type(
2076	rtems_filesystem_location_info_t pathloc / in */
2077	)
2078	{
2079	NfsNode node = pathloc->node_access;
2080
2081	if (updateAttr(node, 0 /* only if old */))
2082	return -1;
2083
2084	switch( SERP_ATTR(node).type ) {
2085	default:
2086	/* rtems has no value for 'unknown';
2087	*/
2088	case NFNON:
2089	case NFSOCK:
2090	case NFBAD:
2091	case NFFIFO:
2092	break;
2093
2094
2095	case NFREG: return RTEMS_FILESYSTEM_MEMORY_FILE;
2096	case NFDIR: return RTEMS_FILESYSTEM_DIRECTORY;
2097
2098	case NFBLK:
2099	case NFCHR: return RTEMS_FILESYSTEM_DEVICE;
2100
2101	case NFLNK: return RTEMS_FILESYSTEM_SYM_LINK;
2102	}
2103	return -1;
2104	}
2105
2106	static int nfs_mknod(
2107	const char path, / IN */
2108	mode_t mode, /* IN */
2109	dev_t dev, /* IN */
2110	rtems_filesystem_location_info_t pathloc / IN/OUT */
2111	)
2112	{
2113
2114	struct timeval now;
2115	diropres res;
2116	NfsNode node = pathloc->node_access;
2117	mode_t type = S_IFMT & mode;
2118
2119	if (type != S_IFDIR && type != S_IFREG)
2120	rtems_set_errno_and_return_minus_one(ENOTSUP);
2121
2122	#if DEBUG & DEBUG_SYSCALLS
2123	fprintf(stderr,"nfs_mknod: creating %s\n", path);
2124	#endif
2125
2126	rtems_clock_get_tod_timeval(&now);
2127
2128	SERP_ARGS(node).createarg.name = (filename)path;
2129	SERP_ARGS(node).createarg.attributes.mode = mode;
2130	/* TODO: either use our uid or use the Nfs credentials */
2131	SERP_ARGS(node).createarg.attributes.uid = 0;
2132	SERP_ARGS(node).createarg.attributes.gid = 0;
2133	SERP_ARGS(node).createarg.attributes.size = 0;
2134	SERP_ARGS(node).createarg.attributes.atime.seconds = now.tv_sec;
2135	SERP_ARGS(node).createarg.attributes.atime.useconds = now.tv_usec;
2136	SERP_ARGS(node).createarg.attributes.mtime.seconds = now.tv_sec;
2137	SERP_ARGS(node).createarg.attributes.mtime.useconds = now.tv_usec;
2138
2139	if ( nfscall( node->nfs->server,
2140	NFSPROC_CREATE,
2141	(xdrproc_t)xdr_createargs, &SERP_FILE(node),
2142	(xdrproc_t)xdr_diropres, &res)
2143	\|\| (NFS_OK != (errno = res.status)) ) {
2144	#if DEBUG & DEBUG_SYSCALLS
2145	perror("nfs_mknod");
2146	#endif
2147	return -1;
2148	}
2149
2150	return 0;
2151	}
2152
2153	static int nfs_utime(
2154	rtems_filesystem_location_info_t pathloc, / IN */
2155	time_t actime, /* IN */
2156	time_t modtime /* IN */
2157	)
2158	{
2159	sattr arg;
2160
2161	/* TODO: add rtems EPOCH - UNIX EPOCH seconds */
2162	arg.atime.seconds = actime;
2163	arg.atime.useconds = 0;
2164	arg.mtime.seconds = modtime;
2165	arg.mtime.useconds = 0;
2166
2167	return nfs_sattr(pathloc->node_access, &arg, SATTR_ATIME \| SATTR_MTIME);
2168	}
2169
2170	static int nfs_symlink(
2171	rtems_filesystem_location_info_t loc, / IN */
2172	const char link_name, / IN */
2173	const char *node_name
2174	)
2175	{
2176	struct timeval now;
2177	nfsstat status;
2178	NfsNode node = loc->node_access;
2179
2180
2181	#if DEBUG & DEBUG_SYSCALLS
2182	fprintf(stderr,"nfs_symlink: creating %s -> %s\n", link_name, node_name);
2183	#endif
2184
2185	rtems_clock_get_tod_timeval(&now);
2186
2187	SERP_ARGS(node).symlinkarg.name = (filename)link_name;
2188	SERP_ARGS(node).symlinkarg.to = (nfspath) node_name;
2189
2190	SERP_ARGS(node).symlinkarg.attributes.mode = S_IFLNK \| S_IRWXU \| S_IRWXG \| S_IRWXO;
2191	/* TODO */
2192	SERP_ARGS(node).symlinkarg.attributes.uid = 0;
2193	SERP_ARGS(node).symlinkarg.attributes.gid = 0;
2194	SERP_ARGS(node).symlinkarg.attributes.size = 0;
2195	SERP_ARGS(node).symlinkarg.attributes.atime.seconds = now.tv_sec;
2196	SERP_ARGS(node).symlinkarg.attributes.atime.useconds = now.tv_usec;
2197	SERP_ARGS(node).symlinkarg.attributes.mtime.seconds = now.tv_sec;
2198	SERP_ARGS(node).symlinkarg.attributes.mtime.useconds = now.tv_usec;
2199
2200	if ( nfscall( node->nfs->server,
2201	NFSPROC_SYMLINK,
2202	(xdrproc_t)xdr_symlinkargs, &SERP_FILE(node),
2203	(xdrproc_t)xdr_nfsstat, &status)
2204	\|\| (NFS_OK != (errno = status)) ) {
2205	#if DEBUG & DEBUG_SYSCALLS
2206	perror("nfs_symlink");
2207	#endif
2208	return -1;
2209	}
2210
2211	return 0;
2212	}
2213
2214	static int nfs_do_readlink(
2215	rtems_filesystem_location_info_t loc, / IN */
2216	strbuf psbuf / IN/OUT */
2217	)
2218	{
2219	NfsNode node = loc->node_access;
2220	Nfs nfs = node->nfs;
2221	readlinkres_strbuf rr;
2222	int wasAlloced;
2223	int rval;
2224
2225	rr.strbuf = *psbuf;
2226
2227	wasAlloced = (0 == psbuf->buf);
2228
2229	if ( (rval = nfscall(nfs->server,
2230	NFSPROC_READLINK,
2231	(xdrproc_t)xdr_nfs_fh, &SERP_FILE(node),
2232	(xdrproc_t)xdr_readlinkres_strbuf, &rr)) ) {
2233	if (wasAlloced)
2234	xdr_free( (xdrproc_t)xdr_strbuf, (caddr_t)&rr.strbuf );
2235	}
2236
2237
2238	if (NFS_OK != rr.status) {
2239	if (wasAlloced)
2240	xdr_free( (xdrproc_t)xdr_strbuf, (caddr_t)&rr.strbuf );
2241	rtems_set_errno_and_return_minus_one(rr.status);
2242	}
2243
2244	*psbuf = rr.strbuf;
2245
2246	return 0;
2247	}
2248
2249	static int nfs_readlink(
2250	rtems_filesystem_location_info_t loc, / IN */
2251	char buf, / OUT */
2252	size_t len
2253	)
2254	{
2255	strbuf sbuf;
2256	sbuf.buf = buf;
2257	sbuf.max = len;
2258
2259	return nfs_do_readlink(loc, &sbuf);
2260	}
2261
2262	/* The semantics of this routine are:
2263	*
2264	* The caller submits a valid pathloc, i.e. it has
2265	* an NfsNode attached to node_access.
2266	* On return, pathloc points to the target node which
2267	* may or may not be an NFS node.
2268	* Hence, the original NFS node is released in either
2269	* case:
2270	* - link evaluation fails; pathloc points to no valid node
2271	* - link evaluation success; pathloc points to a new valid
2272	* node. If it's an NFS node, a new NfsNode will be attached
2273	* to node_access...
2274	*/
2275
2276	#define LINKVAL_BUFLEN (MAXPATHLEN+1)
2277	#define RVAL_ERR_BUT_DONT_FREENODE (-1)
2278	#define RVAL_ERR_AND_DO_FREENODE ( 1)
2279	#define RVAL_OK ( 0)
2280
2281	static int nfs_eval_link(
2282	rtems_filesystem_location_info_t pathloc, / IN/OUT */
2283	int flags /* IN */
2284	)
2285	{
2286	rtems_filesystem_node_types_t type;
2287	char *buf = malloc(LINKVAL_BUFLEN);
2288	int rval = RVAL_ERR_AND_DO_FREENODE;
2289
2290	if (!buf) {
2291	errno = ENOMEM;
2292	goto cleanup;
2293	}
2294
2295	/* in this loop, we must not use NFS specific ops as we might
2296	* step out of our FS during the process...
2297	* This algorithm should actually be performed by the
2298	* generic's evaluate_path routine :-(
2299	*
2300	* Unfortunately, there is no way of finding the
2301	* directory node who contains 'pathloc', however :-(
2302	*/
2303	do {
2304	/* assume the generics have verified 'pathloc' to be
2305	* a link...
2306	*/
2307	if ( !pathloc->ops->readlink_h ) {
2308	errno = ENOTSUP;
2309	goto cleanup;
2310	}
2311
2312	if ( pathloc->ops->readlink_h(pathloc, buf, LINKVAL_BUFLEN) ) {
2313	goto cleanup;
2314	}
2315
2316	#if DEBUG & DEBUG_EVALPATH
2317	fprintf(stderr, "link value is '%s'\n", buf);
2318	#endif
2319
2320	/* is the link value an absolute path ? */
2321	if ( DELIM != *buf ) {
2322	/* NO; a relative path */
2323
2324	/* we must backup to the link's directory - we
2325	* know only how to do that for NFS, however.
2326	* In this special case, we can avoid recursion.
2327	* Otherwise (i.e. if the link is on another FS),
2328	* we must step into its eval_link_h().
2329	*/
2330	if (locIsNfs(pathloc)) {
2331	NfsNode node = pathloc->node_access;
2332	int err;
2333
2334	memcpy( &SERP_FILE(node),
2335	&node->args.dir,
2336	sizeof(node->args.dir) );
2337
2338	if (updateAttr(node, 1 /* force */))
2339	goto cleanup;
2340
2341	if (SERP_ATTR(node).type != NFDIR) {
2342	errno = ENOTDIR;
2343	goto cleanup;
2344	}
2345
2346	pathloc->handlers = &nfs_dir_file_handlers;
2347
2348	err = nfs_evalpath(buf, strlen(buf), flags, pathloc);
2349
2350	/* according to its semantics,
2351	* nfs_evalpath cloned the node attached
2352	* to pathloc. Hence we have to
2353	* release the old one (referring to
2354	* the link; the new clone has been
2355	* updated and refers to the link _value_).
2356	*/
2357	nfsNodeDestroy(node);
2358
2359	if (err) {
2360	/* nfs_evalpath has set errno;
2361	* pathloc->node_access has no
2362	* valid node attached in this case
2363	*/
2364	rval = RVAL_ERR_BUT_DONT_FREENODE;
2365	goto cleanup;
2366	}
2367
2368	} else {
2369	if ( ! pathloc->ops->eval_link_h ) {
2370	errno = ENOTSUP;
2371	goto cleanup;
2372	}
2373	if (!pathloc->ops->eval_link_h(pathloc, flags)) {
2374	/* FS is responsible for freeing its pathloc->node_access
2375	* if necessary
2376	*/
2377	rval = RVAL_ERR_BUT_DONT_FREENODE;
2378	goto cleanup;
2379	}
2380	}
2381	} else {
2382	/* link points to an absolute path '/xxx' */
2383
2384	/* release this node; filesystem_evaluate_path() will
2385	* lookup a new one.
2386	*/
2387	rtems_filesystem_freenode(pathloc);
2388
2389	if (rtems_filesystem_evaluate_path(buf, strlen(buf), flags, pathloc, 1)) {
2390	/* If evalpath fails then there is no valid node
2391	* attached to pathloc; hence we must not attempt
2392	* to free the node
2393	*/
2394	rval = RVAL_ERR_BUT_DONT_FREENODE;
2395	goto cleanup;
2396	}
2397	}
2398
2399	if ( !pathloc->ops->node_type_h ) {
2400	errno = ENOTSUP;
2401	goto cleanup;
2402	}
2403
2404	type = pathloc->ops->node_type_h(pathloc);
2405
2406
2407	/* I dont know what to do about hard links */
2408	} while ( RTEMS_FILESYSTEM_SYM_LINK == type );
2409
2410	rval = RVAL_OK;
2411
2412	cleanup:
2413
2414	free(buf);
2415
2416	if (RVAL_ERR_AND_DO_FREENODE == rval) {
2417	rtems_filesystem_freenode(pathloc);
2418	return -1;
2419	}
2420
2421	return rval;
2422	}
2423
2424
2425	struct _rtems_filesystem_operations_table nfs_fs_ops = {
2426	nfs_evalpath, /* MANDATORY */
2427	nfs_evalformake, /* MANDATORY; may set errno=ENOSYS and return -1 */
2428	nfs_link, /* OPTIONAL; may be defaulted */
2429	nfs_unlink, /* OPTIONAL; may be defaulted */
2430	nfs_node_type, /* OPTIONAL; may be defaulted; BUG in mount - no test!! */
2431	nfs_mknod, /* OPTIONAL; may be defaulted */
2432	nfs_chown, /* OPTIONAL; may be defaulted */
2433	nfs_freenode, /* OPTIONAL; may be defaulted; (release node_access) */
2434	rtems_filesystem_default_mount,
2435	rtems_nfs_initialize, /* OPTIONAL; may be defaulted -- not used anymore */
2436	rtems_filesystem_default_unmount,
2437	nfs_fsunmount_me, /* OPTIONAL; may be defaulted */
2438	nfs_utime, /* OPTIONAL; may be defaulted */
2439	nfs_eval_link, /* OPTIONAL; may be defaulted */
2440	nfs_symlink, /* OPTIONAL; may be defaulted */
2441	nfs_readlink, /* OPTIONAL; may be defaulted */
2442	rtems_filesystem_default_rename, /* OPTIONAL; may be defaulted */
2443	rtems_filesystem_default_statvfs /* OPTIONAL; may be defaulted */
2444
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	/* stateless NFS protocol makes this trivial */
2472	static int nfs_file_open(
2473	rtems_libio_t *iop,
2474	const char *pathname,
2475	uint32_t flag,
2476	uint32_t mode
2477	)
2478	{
2479	return 0;
2480	}
2481
2482	/* reading directories is not stateless; we must
2483	* remember the last 'read' position, i.e.
2484	* the server 'cookie'. We do manage this information
2485	* attached to the pathinfo.node_access_2.
2486	*/
2487	static int nfs_dir_open(
2488	rtems_libio_t *iop,
2489	const char *pathname,
2490	uint32_t flag,
2491	uint32_t mode
2492	)
2493	{
2494	NfsNode node = iop->pathinfo.node_access;
2495	DirInfo di;
2496
2497	/* create a readdirargs object and copy the file handle;
2498	* attach to the pathinfo.node_access_2
2499	*/
2500
2501	di = (DirInfo) malloc(sizeof(*di));
2502	iop->pathinfo.node_access_2 = di;
2503
2504	if ( !di ) {
2505	errno = ENOMEM;
2506	return -1;
2507	}
2508
2509	memcpy( &di->readdirargs.dir,
2510	&SERP_FILE(node),
2511	sizeof(di->readdirargs.dir) );
2512
2513	/* rewind cookie */
2514	memset( &di->readdirargs.cookie,
2515	0,
2516	sizeof(di->readdirargs.cookie) );
2517
2518	di->eofreached = FALSE;
2519
2520	return 0;
2521	}
2522
2523	static int nfs_file_close(
2524	rtems_libio_t *iop
2525	)
2526	{
2527	return 0;
2528	}
2529
2530	static int nfs_dir_close(
2531	rtems_libio_t *iop
2532	)
2533	{
2534	free(iop->pathinfo.node_access_2);
2535	iop->pathinfo.node_access_2 = 0;
2536	return 0;
2537	}
2538
2539	static ssize_t nfs_file_read(
2540	rtems_libio_t *iop,
2541	void *buffer,
2542	size_t count
2543	)
2544	{
2545	readres rr;
2546	NfsNode node = iop->pathinfo.node_access;
2547	Nfs nfs = node->nfs;
2548
2549	if (count > NFS_MAXDATA)
2550	count = NFS_MAXDATA;
2551
2552	SERP_ARGS(node).readarg.offset = iop->offset;
2553	SERP_ARGS(node).readarg.count = count;
2554	SERP_ARGS(node).readarg.totalcount = UINT32_C(0xdeadbeef);
2555
2556	rr.readres_u.reply.data.data_val = buffer;
2557
2558	if ( nfscall( nfs->server,
2559	NFSPROC_READ,
2560	(xdrproc_t)xdr_readargs, &SERP_FILE(node),
2561	(xdrproc_t)xdr_readres, &rr) ) {
2562	return -1;
2563	}
2564
2565
2566	if (NFS_OK != rr.status) {
2567	rtems_set_errno_and_return_minus_one(rr.status);
2568	}
2569
2570	#if DEBUG & DEBUG_SYSCALLS
2571	fprintf(stderr,
2572	"Read %i (asked for %i) bytes from offset %i to 0x%08x\n",
2573	rr.readres_u.reply.data.data_len,
2574	count,
2575	iop->offset,
2576	rr.readres_u.reply.data.data_val);
2577	#endif
2578
2579
2580	return rr.readres_u.reply.data.data_len;
2581	}
2582
2583	/* this is called by readdir() / getdents() */
2584	static ssize_t nfs_dir_read(
2585	rtems_libio_t *iop,
2586	void *buffer,
2587	size_t count
2588	)
2589	{
2590	DirInfo di = iop->pathinfo.node_access_2;
2591	RpcUdpServer server = ((Nfs)iop->pathinfo.mt_entry->fs_info)->server;
2592
2593	if ( di->eofreached )
2594	return 0;
2595
2596	di->ptr = di->buf = buffer;
2597
2598	/* align + round down the buffer */
2599	count &= ~ (DIRENT_HEADER_SIZE - 1);
2600	di->len = count;
2601
2602	#if 0
2603	/* now estimate the number of entries we should ask for */
2604	count /= DIRENT_HEADER_SIZE + CONFIG_AVG_NAMLEN;
2605
2606	/* estimate the encoded size that might take up */
2607	count *= dirres_entry_size + CONFIG_AVG_NAMLEN;
2608	#else
2609	/* integer arithmetics are better done the other way round */
2610	count *= dirres_entry_size + CONFIG_AVG_NAMLEN;
2611	count /= DIRENT_HEADER_SIZE + CONFIG_AVG_NAMLEN;
2612	#endif
2613
2614	if (count > NFS_MAXDATA)
2615	count = NFS_MAXDATA;
2616
2617	di->readdirargs.count = count;
2618
2619	#if DEBUG & DEBUG_READDIR
2620	fprintf(stderr,
2621	"Readdir: asking for %i XDR bytes, buffer is %i\n",
2622	count, di->len);
2623	#endif
2624
2625	if ( nfscall(
2626	server,
2627	NFSPROC_READDIR,
2628	(xdrproc_t)xdr_readdirargs, &di->readdirargs,
2629	(xdrproc_t)xdr_dir_info, di) ) {
2630	return -1;
2631	}
2632
2633
2634	if (NFS_OK != di->status) {
2635	rtems_set_errno_and_return_minus_one(di->status);
2636	}
2637
2638	return (char)di->ptr - (char)buffer;
2639	}
2640
2641	static ssize_t nfs_file_write(
2642	rtems_libio_t *iop,
2643	const void *buffer,
2644	size_t count
2645	)
2646	{
2647	NfsNode node = iop->pathinfo.node_access;
2648	Nfs nfs = node->nfs;
2649	int e;
2650
2651	if (count > NFS_MAXDATA)
2652	count = NFS_MAXDATA;
2653
2654
2655	SERP_ARGS(node).writearg.beginoffset = UINT32_C(0xdeadbeef);
2656	if ( LIBIO_FLAGS_APPEND & iop->flags ) {
2657	if ( updateAttr(node, 0) ) {
2658	return -1;
2659	}
2660	SERP_ARGS(node).writearg.offset = SERP_ATTR(node).size;
2661	} else {
2662	SERP_ARGS(node).writearg.offset = iop->offset;
2663	}
2664	SERP_ARGS(node).writearg.totalcount = UINT32_C(0xdeadbeef);
2665	SERP_ARGS(node).writearg.data.data_len = count;
2666	SERP_ARGS(node).writearg.data.data_val = (void*)buffer;
2667
2668	/* write XDR buffer size will be chosen by nfscall based
2669	* on the PROC specifier
2670	*/
2671
2672	if ( nfscall( nfs->server,
2673	NFSPROC_WRITE,
2674	(xdrproc_t)xdr_writeargs, &SERP_FILE(node),
2675	(xdrproc_t)xdr_attrstat, &node->serporid) ) {
2676	return -1;
2677	}
2678
2679
2680	if (NFS_OK != (e=node->serporid.status) ) {
2681	/* try at least to recover the current attributes */
2682	updateAttr(node, 1 /* force */);
2683	rtems_set_errno_and_return_minus_one(e);
2684	}
2685
2686	node->age = nowSeconds();
2687
2688	return count;
2689	}
2690
2691	static rtems_off64_t nfs_file_lseek(
2692	rtems_libio_t *iop,
2693	rtems_off64_t length,
2694	int whence
2695	)
2696	{
2697	#if DEBUG & DEBUG_SYSCALLS
2698	fprintf(stderr,
2699	"lseek to %i (length %i, whence %i)\n",
2700	iop->offset,
2701	length,
2702	whence);
2703	#endif
2704	if ( SEEK_END == whence ) {
2705	/* rtems (4.6.2) libcsupport code 'lseek' uses iop->size to
2706	* compute the offset. We don't want to track the file size
2707	* by updating 'iop->size' constantly.
2708	* Since lseek is the only place using iop->size, we work
2709	* around this by tweaking the offset here...
2710	*/
2711	NfsNode node = iop->pathinfo.node_access;
2712	fattr *fa = &SERP_ATTR(node);
2713
2714	if (updateAttr(node, 0 /* only if old */)) {
2715	return -1;
2716	}
2717	iop->offset = fa->size;
2718	}
2719
2720	/* this is particularly easy :-) */
2721	return iop->offset;
2722	}
2723
2724	static rtems_off64_t nfs_dir_lseek(
2725	rtems_libio_t *iop,
2726	rtems_off64_t length,
2727	int whence
2728	)
2729	{
2730	DirInfo di = iop->pathinfo.node_access_2;
2731
2732	/* we don't support anything other than
2733	* rewinding
2734	*/
2735	if (SEEK_SET != whence \|\| 0 != length) {
2736	errno = ENOTSUP;
2737	return -1;
2738	}
2739
2740	/* rewind cookie */
2741	memset( &di->readdirargs.cookie,
2742	0,
2743	sizeof(di->readdirargs.cookie) );
2744
2745	di->eofreached = FALSE;
2746
2747	return iop->offset;
2748	}
2749
2750	#if 0 /* structure types for reference */
2751	struct fattr {
2752	ftype type;
2753	u_int mode;
2754	u_int nlink;
2755	u_int uid;
2756	u_int gid;
2757	u_int size;
2758	u_int blocksize;
2759	u_int rdev;
2760	u_int blocks;
2761	u_int fsid;
2762	u_int fileid;
2763	nfstime atime;
2764	nfstime mtime;
2765	nfstime ctime;
2766	};
2767
2768	struct stat
2769	{
2770	dev_t st_dev;
2771	ino_t st_ino;
2772	mode_t st_mode;
2773	nlink_t st_nlink;
2774	uid_t st_uid;
2775	gid_t st_gid;
2776	dev_t st_rdev;
2777	rtems_off64_t st_size;
2778	/* SysV/sco doesn't have the rest... But Solaris, eabi does. */
2779	#if defined(__svr4__) && !defined(__PPC__) && !defined(__sun__)
2780	time_t st_atime;
2781	time_t st_mtime;
2782	time_t st_ctime;
2783	#else
2784	time_t st_atime;
2785	long st_spare1;
2786	time_t st_mtime;
2787	long st_spare2;
2788	time_t st_ctime;
2789	long st_spare3;
2790	long st_blksize;
2791	long st_blocks;
2792	long st_spare4[2];
2793	#endif
2794	};
2795	#endif
2796
2797	/* common for file/dir/link */
2798	static int nfs_fstat(
2799	rtems_filesystem_location_info_t *loc,
2800	struct stat *buf
2801	)
2802	{
2803	NfsNode node = loc->node_access;
2804	fattr *fa = &SERP_ATTR(node);
2805
2806	if (updateAttr(node, 0 /* only if old */)) {
2807	return -1;
2808	}
2809
2810	/* done by caller
2811	memset(buf, 0, sizeof(*buf));
2812	*/
2813
2814	/* translate */
2815
2816	/* one of the branches hopefully is optimized away */
2817	if (sizeof(ino_t) < sizeof(u_int)) {
2818	buf->st_dev = NFS_MAKE_DEV_T_INO_HACK((NfsNode)loc->node_access);
2819	} else {
2820	buf->st_dev = NFS_MAKE_DEV_T((NfsNode)loc->node_access);
2821	}
2822	buf->st_mode = fa->mode;
2823	buf->st_nlink = fa->nlink;
2824	buf->st_uid = fa->uid;
2825	buf->st_gid = fa->gid;
2826	buf->st_size = fa->size;
2827	/* Set to "preferred size" of this NFS client implementation */
2828	buf->st_blksize = nfsStBlksize ? nfsStBlksize : fa->blocksize;
2829	buf->st_rdev = fa->rdev;
2830	buf->st_blocks = fa->blocks;
2831	buf->st_ino = fa->fileid;
2832	buf->st_atime = fa->atime.seconds;
2833	buf->st_mtime = fa->mtime.seconds;
2834	buf->st_ctime = fa->ctime.seconds;
2835
2836	#if 0 /* NFS should return the modes */
2837	switch(fa->type) {
2838	default:
2839	case NFNON:
2840	case NFBAD:
2841	break;
2842
2843	case NFSOCK: buf->st_mode \|= S_IFSOCK; break;
2844	case NFFIFO: buf->st_mode \|= S_IFIFO; break;
2845	case NFREG : buf->st_mode \|= S_IFREG; break;
2846	case NFDIR : buf->st_mode \|= S_IFDIR; break;
2847	case NFBLK : buf->st_mode \|= S_IFBLK; break;
2848	case NFCHR : buf->st_mode \|= S_IFCHR; break;
2849	case NFLNK : buf->st_mode \|= S_IFLNK; break;
2850	}
2851	#endif
2852
2853	return 0;
2854	}
2855
2856	/* a helper which does the real work for
2857	* a couple of handlers (such as chmod,
2858	* ftruncate or utime)
2859	*/
2860	static int
2861	nfs_sattr(NfsNode node, sattr *arg, u_long mask)
2862	{
2863
2864	struct timeval now;
2865	nfstime nfsnow, t;
2866	int e;
2867	u_int mode;
2868
2869	if (updateAttr(node, 0 /* only if old */))
2870	return -1;
2871
2872	rtems_clock_get_tod_timeval(&now);
2873
2874	/* TODO: add rtems EPOCH - UNIX EPOCH seconds */
2875	nfsnow.seconds = now.tv_sec;
2876	nfsnow.useconds = now.tv_usec;
2877
2878	/* merge permission bits into existing type bits */
2879	mode = SERP_ATTR(node).mode;
2880	if (mask & SATTR_MODE) {
2881	mode &= S_IFMT;
2882	mode \|= arg->mode & ~S_IFMT;
2883	} else {
2884	mode = -1;
2885	}
2886	SERP_ARGS(node).sattrarg.attributes.mode = mode;
2887
2888	SERP_ARGS(node).sattrarg.attributes.uid =
2889	(mask & SATTR_UID) ? arg->uid : -1;
2890
2891	SERP_ARGS(node).sattrarg.attributes.gid =
2892	(mask & SATTR_GID) ? arg->gid : -1;
2893
2894	SERP_ARGS(node).sattrarg.attributes.size =
2895	(mask & SATTR_SIZE) ? arg->size : -1;
2896
2897	if (mask & SATTR_ATIME)
2898	t = arg->atime;
2899	else if (mask & SATTR_TOUCHA)
2900	t = nfsnow;
2901	else
2902	t.seconds = t.useconds = -1;
2903	SERP_ARGS(node).sattrarg.attributes.atime = t;
2904
2905	if (mask & SATTR_ATIME)
2906	t = arg->mtime;
2907	else if (mask & SATTR_TOUCHA)
2908	t = nfsnow;
2909	else
2910	t.seconds = t.useconds = -1;
2911	SERP_ARGS(node).sattrarg.attributes.mtime = t;
2912
2913	node->serporid.status = NFS_OK;
2914
2915	if ( nfscall( node->nfs->server,
2916	NFSPROC_SETATTR,
2917	(xdrproc_t)xdr_sattrargs, &SERP_FILE(node),
2918	(xdrproc_t)xdr_attrstat, &node->serporid) ) {
2919	#if DEBUG & DEBUG_SYSCALLS
2920	fprintf(stderr,
2921	"nfs_sattr (mask 0x%08x): %s",
2922	mask,
2923	strerror(errno));
2924	#endif
2925	return -1;
2926	}
2927
2928	if (NFS_OK != (e=node->serporid.status) ) {
2929	#if DEBUG & DEBUG_SYSCALLS
2930	fprintf(stderr,"nfs_sattr: %s\n",strerror(e));
2931	#endif
2932	/* try at least to recover the current attributes */
2933	updateAttr(node, 1 /* force */);
2934	rtems_set_errno_and_return_minus_one(e);
2935	}
2936
2937	node->age = nowSeconds();
2938
2939	return 0;
2940	}
2941
2942
2943	/* common for file/dir/link */
2944	static int nfs_fchmod(
2945	rtems_filesystem_location_info_t *loc,
2946	mode_t mode
2947	)
2948	{
2949	sattr arg;
2950
2951	arg.mode = mode;
2952	return nfs_sattr(loc->node_access, &arg, SATTR_MODE);
2953
2954	}
2955
2956	/* just set the size attribute to 'length'
2957	* the server will take care of the rest :-)
2958	*/
2959	static int nfs_file_ftruncate(
2960	rtems_libio_t *iop,
2961	rtems_off64_t length
2962	)
2963	{
2964	sattr arg;
2965
2966	arg.size = length;
2967	/* must not modify any other attribute; if we are not the owner
2968	* of the file or directory but only have write access changing
2969	* any attribute besides 'size' will fail...
2970	*/
2971	return nfs_sattr(iop->pathinfo.node_access,
2972	&arg,
2973	SATTR_SIZE);
2974	}
2975
2976	/* files and symlinks are removed
2977	* by the common nfs_unlink() routine.
2978	* NFS has a different NFSPROC_RMDIR
2979	* call, though...
2980	*/
2981	static int nfs_dir_rmnod(
2982	rtems_filesystem_location_info_t parentpathloc, / IN */
2983	rtems_filesystem_location_info_t pathloc / IN */
2984	)
2985	{
2986	return nfs_do_unlink(parentpathloc, pathloc, NFSPROC_RMDIR);
2987	}
2988
2989	/* the file handlers table */
2990	static
2991	struct _rtems_filesystem_file_handlers_r nfs_file_file_handlers = {
2992	nfs_file_open, /* OPTIONAL; may be defaulted */
2993	nfs_file_close, /* OPTIONAL; may be defaulted */
2994	nfs_file_read, /* OPTIONAL; may be defaulted */
2995	nfs_file_write, /* OPTIONAL; may be defaulted */
2996	rtems_filesystem_default_ioctl,
2997	nfs_file_lseek, /* OPTIONAL; may be defaulted */
2998	nfs_fstat, /* OPTIONAL; may be defaulted */
2999	nfs_fchmod, /* OPTIONAL; may be defaulted */
3000	nfs_file_ftruncate, /* OPTIONAL; may be defaulted */
3001	rtems_filesystem_default_fpathconf,
3002	rtems_filesystem_default_fsync,
3003	rtems_filesystem_default_fdatasync,
3004	rtems_filesystem_default_fcntl,
3005	nfs_unlink, /* OPTIONAL; may be defaulted */
3006	};
3007
3008	/* the directory handlers table */
3009	static
3010	struct _rtems_filesystem_file_handlers_r nfs_dir_file_handlers = {
3011	nfs_dir_open, /* OPTIONAL; may be defaulted */
3012	nfs_dir_close, /* OPTIONAL; may be defaulted */
3013	nfs_dir_read, /* OPTIONAL; may be defaulted */
3014	rtems_filesystem_default_write,
3015	rtems_filesystem_default_ioctl,
3016	nfs_dir_lseek, /* OPTIONAL; may be defaulted */
3017	nfs_fstat, /* OPTIONAL; may be defaulted */
3018	nfs_fchmod, /* OPTIONAL; may be defaulted */
3019	rtems_filesystem_default_ftruncate,
3020	rtems_filesystem_default_fpathconf,
3021	rtems_filesystem_default_fsync,
3022	rtems_filesystem_default_fdatasync,
3023	rtems_filesystem_default_fcntl,
3024	nfs_dir_rmnod, /* OPTIONAL; may be defaulted */
3025	};
3026
3027	/* the link handlers table */
3028	static
3029	struct _rtems_filesystem_file_handlers_r nfs_link_file_handlers = {
3030	rtems_filesystem_default_open,
3031	rtems_filesystem_default_close,
3032	rtems_filesystem_default_read,
3033	rtems_filesystem_default_write,
3034	rtems_filesystem_default_ioctl,
3035	rtems_filesystem_default_lseek,
3036	nfs_fstat, /* OPTIONAL; may be defaulted */
3037	nfs_fchmod, /* OPTIONAL; may be defaulted */
3038	rtems_filesystem_default_ftruncate,
3039	rtems_filesystem_default_fpathconf,
3040	rtems_filesystem_default_fsync,
3041	rtems_filesystem_default_fdatasync,
3042	rtems_filesystem_default_fcntl,
3043	nfs_unlink, /* OPTIONAL; may be defaulted */
3044	};
3045
3046	/* we need a dummy driver entry table to get a
3047	* major number from the system
3048	*/
3049	static
3050	rtems_device_driver nfs_initialize(
3051	rtems_device_major_number major,
3052	rtems_device_minor_number minor,
3053	void *arg
3054	)
3055	{
3056	/* we don't really use this routine because
3057	* we cannot supply an argument (contrary
3058	* to what the 'arg' parameter suggests - it
3059	* is always set to 0 by the generics :-()
3060	* and because we don't want the user to
3061	* have to deal with the major number (which
3062	* OTOH is something WE are interested in. The
3063	* only reason for using this API was getting
3064	* a major number, after all).
3065	*
3066	* Something must be present, however, to
3067	* reserve a slot in the driver table.
3068	*/
3069	return RTEMS_SUCCESSFUL;
3070	}
3071
3072	static rtems_driver_address_table drvNfs = {
3073	nfs_initialize,
3074	0, /* open */
3075	0, /* close */
3076	0, /* read */
3077	0, /* write */
3078	0 /* control */
3079	};
3080
3081	/* Dump a list of the currently mounted NFS to a file */
3082	int
3083	nfsMountsShow(FILE *f)
3084	{
3085	char *mntpt = 0;
3086	Nfs nfs;
3087
3088	if (!f)
3089	f = stdout;
3090
3091	if ( !(mntpt=malloc(MAXPATHLEN)) ) {
3092	fprintf(stderr,"nfsMountsShow(): no memory\n");
3093	return -1;
3094	}
3095
3096	fprintf(f,"Currently Mounted NFS:\n");
3097
3098	LOCK(nfsGlob.llock);
3099
3100	for (nfs = nfsGlob.mounted_fs; nfs; nfs=nfs->next) {
3101	fprintf(f,"%s on ", nfs->mt_entry->dev);
3102	if (rtems_filesystem_resolve_location(mntpt, MAXPATHLEN, &nfs->mt_entry->mt_fs_root))
3103	fprintf(f,"<UNABLE TO LOOKUP MOUNTPOINT>\n");
3104	else
3105	fprintf(f,"%s\n",mntpt);
3106	}
3107
3108	UNLOCK(nfsGlob.llock);
3109
3110	free(mntpt);
3111	return 0;
3112	}
3113
3114	#if 0
3115	CCJ_REMOVE_MOUNT
3116	/* convenience wrapper
3117	*
3118	* NOTE: this routine calls NON-REENTRANT
3119	* gethostbyname() if the host is
3120	* not in 'dot' notation.
3121	*/
3122	int
3123	nfsMount(char uidhost, char path, char *mntpoint)
3124	{
3125	struct stat st;
3126	int devl;
3127	char *host;
3128	int rval = -1;
3129	char *dev = 0;
3130
3131	if (!uidhost \|\| !path \|\| !mntpoint) {
3132	fprintf(stderr,"usage: nfsMount(""[uid.gid@]host"",""path"",""mountpoint"")\n");
3133	nfsMountsShow(stderr);
3134	return -1;
3135	}
3136
3137	if ( !(dev = malloc((devl=strlen(uidhost) + 20 + strlen(path)+1))) ) {
3138	fprintf(stderr,"nfsMount: out of memory\n");
3139	return -1;
3140	}
3141
3142	/* Try to create the mount point if nonexistent */
3143	if (stat(mntpoint, &st)) {
3144	if (ENOENT != errno) {
3145	perror("nfsMount trying to create mount point - stat failed");
3146	goto cleanup;
3147	} else if (mkdir(mntpoint,0777)) {
3148	perror("nfsMount trying to create mount point");
3149	goto cleanup;
3150	}
3151	}
3152
3153	if ( !(host=strchr(uidhost,UIDSEP)) ) {
3154	host = uidhost;
3155	} else {
3156	host++;
3157	}
3158
3159	if (isdigit((unsigned char)*host)) {
3160	/* avoid using gethostbyname */
3161	sprintf(dev,"%s:%s",uidhost,path);
3162	} else {
3163	struct hostent *h;
3164
3165	/* copy the uid part (hostname will be
3166	* overwritten)
3167	*/
3168	strcpy(dev, uidhost);
3169
3170	/* NOTE NOTE NOTE: gethostbyname is NOT
3171	* thread safe. This is UGLY
3172	*/
3173
3174	/* BEGIN OF NON-THREAD SAFE REGION */
3175
3176	h = gethostbyname(host);
3177
3178	if ( !h \|\|
3179	!inet_ntop( AF_INET,
3180	(struct in_addr*)h->h_addr_list[0],
3181	dev + (host - uidhost),
3182	devl - (host - uidhost) )
3183	) {
3184	fprintf(stderr,"nfsMount: host '%s' not found\n",host);
3185	goto cleanup;
3186	}
3187
3188	/* END OF NON-THREAD SAFE REGION */
3189
3190	/* append ':<path>' */
3191	strcat(dev,":");
3192	strcat(dev,path);
3193	}
3194
3195	printf("Trying to mount %s on %s\n",dev,mntpoint);
3196
3197	if (mount(dev,
3198	mntpoint,
3199	"nfs",
3200	RTEMS_FILESYSTEM_READ_WRITE,
3201	NULL)) {
3202	perror("nfsMount - mount");
3203	goto cleanup;
3204	}
3205
3206	rval = 0;
3207
3208	cleanup:
3209	free(dev);
3210	return rval;
3211	}
3212	#endif
3213
3214	/* HERE COMES A REALLY UGLY HACK */
3215
3216	/* This is stupid; it is _very_ hard to find the path
3217	* leading to a rtems_filesystem_location_info_t node :-(
3218	* The only easy way is making the location the current
3219	* directory and issue a getcwd().
3220	* However, since we don't want to tamper with the
3221	* current directory, we must create a separate
3222	* task to do the job for us - sigh.
3223	*/
3224
3225	typedef struct ResolvePathArgRec_ {
3226	rtems_filesystem_location_info_t loc; / IN: location to resolve */
3227	char buf; / IN/OUT: buffer where to put the path */
3228	int len; /* IN: buffer length */
3229	rtems_id sync; /* IN: synchronization */
3230	rtems_status_code status; /* OUT: result */
3231	} ResolvePathArgRec, *ResolvePathArg;
3232
3233	static void
3234	resolve_path(rtems_task_argument arg)
3235	{
3236	ResolvePathArg rpa = (ResolvePathArg)arg;
3237	rtems_filesystem_location_info_t old;
3238
3239	/* IMPORTANT: let the helper task have its own libio environment (i.e. cwd) */
3240	if (RTEMS_SUCCESSFUL == (rpa->status = rtems_libio_set_private_env())) {
3241
3242	old = rtems_filesystem_current;
3243
3244	rtems_filesystem_current = *(rpa->loc);
3245
3246	if ( !getcwd(rpa->buf, rpa->len) )
3247	rpa->status = RTEMS_UNSATISFIED;
3248
3249	/* must restore the cwd because 'freenode' will be called on it */
3250	rtems_filesystem_current = old;
3251	}
3252	rtems_semaphore_release(rpa->sync);
3253	rtems_task_delete(RTEMS_SELF);
3254	}
3255
3256
3257	/* a utility routine to find the path leading to a
3258	* rtems_filesystem_location_info_t node
3259	*
3260	* INPUT: 'loc' and a buffer 'buf' (length 'len') to hold the
3261	* path.
3262	* OUTPUT: path copied into 'buf'
3263	*
3264	* RETURNS: 0 on success, RTEMS error code on error.
3265	*/
3266	rtems_status_code
3267	rtems_filesystem_resolve_location(char buf, int len, rtems_filesystem_location_info_t loc)
3268	{
3269	ResolvePathArgRec arg;
3270	rtems_id tid = 0;
3271	rtems_task_priority pri;
3272	rtems_status_code status;
3273
3274	arg.loc = loc;
3275	arg.buf = buf;
3276	arg.len = len;
3277	arg.sync = 0;
3278
3279	status = rtems_semaphore_create(
3280	rtems_build_name('r','e','s','s'),
3281	0,
3282	RTEMS_SIMPLE_BINARY_SEMAPHORE,
3283	0,
3284	&arg.sync);
3285
3286	if (RTEMS_SUCCESSFUL != status)
3287	goto cleanup;
3288
3289	rtems_task_set_priority(RTEMS_SELF, RTEMS_CURRENT_PRIORITY, &pri);
3290
3291	status = rtems_task_create(
3292	rtems_build_name('r','e','s','s'),
3293	pri,
3294	RTEMS_MINIMUM_STACK_SIZE + 50000,
3295	RTEMS_DEFAULT_MODES,
3296	RTEMS_DEFAULT_ATTRIBUTES,
3297	&tid);
3298
3299	if (RTEMS_SUCCESSFUL != status)
3300	goto cleanup;
3301
3302	status = rtems_task_start(tid, resolve_path, (rtems_task_argument)&arg);
3303
3304	if (RTEMS_SUCCESSFUL != status) {
3305	rtems_task_delete(tid);
3306	goto cleanup;
3307	}
3308
3309
3310	/* synchronize with the helper task */
3311	rtems_semaphore_obtain(arg.sync, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
3312
3313	status = arg.status;
3314
3315	cleanup:
3316	if (arg.sync)
3317	rtems_semaphore_delete(arg.sync);
3318
3319	return status;
3320	}
3321
3322	int
3323	nfsSetTimeout(uint32_t timeout_ms)
3324	{
3325	rtems_interrupt_level k;
3326	uint32_t s,us;
3327
3328	if ( timeout_ms > 100000 ) {
3329	/* out of range */
3330	return -1;
3331	}
3332
3333	s = timeout_ms/1000;
3334	us = (timeout_ms % 1000) * 1000;
3335
3336	rtems_interrupt_disable(k);
3337	_nfscalltimeout.tv_sec = s;
3338	_nfscalltimeout.tv_usec = us;
3339	rtems_interrupt_enable(k);
3340
3341	return 0;
3342	}
3343
3344	uint32_t
3345	nfsGetTimeout( void )
3346	{
3347	rtems_interrupt_level k;
3348	uint32_t s,us;
3349	rtems_interrupt_disable(k);
3350	s = _nfscalltimeout.tv_sec;
3351	us = _nfscalltimeout.tv_usec;
3352	rtems_interrupt_enable(k);
3353	return s*1000 + us/1000;
3354	}

Note: See TracBrowser for help on using the repository browser.

Context Navigation

source: rtems/cpukit/libfs/src/nfsclient/src/nfs.c @ 9788279

Download in other formats: