xref: /titanic_44/usr/src/cmd/fs.d/df.c (revision de6a15ee5bac749223cdd3f3d02367ab582243ff)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
23 /*	  All Rights Reserved  	*/
24 
25 
26 /*
27  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
28  * Use is subject to license terms.
29  */
30 
31 
32 #pragma ident	"%Z%%M%	%I%	%E% SMI"
33 
34 #include <dlfcn.h>
35 #include <stdio.h>
36 #include <stdarg.h>
37 #include <string.h>
38 #include <locale.h>
39 #include <libintl.h>
40 #include <stdlib.h>
41 #include <ftw.h>
42 #include <errno.h>
43 #include <sys/types.h>
44 #include <unistd.h>
45 #include <sys/statvfs.h>
46 #include <sys/stat.h>
47 #include <sys/param.h>
48 #include <sys/mnttab.h>
49 #include <sys/mntent.h>
50 #include <sys/vfstab.h>
51 #include <sys/wait.h>
52 #include <sys/mkdev.h>
53 #include <sys/int_limits.h>
54 #include <sys/zone.h>
55 #include <libzfs.h>
56 
57 #include "fslib.h"
58 
59 extern char *default_fstype(char *);
60 
61 /*
62  * General notice:
63  * String pointers in this code may point to statically allocated memory
64  * or dynamically allocated memory. Furthermore, a dynamically allocated
65  * string may be pointed to by more than one pointer. This does not pose
66  * a problem because malloc'ed memory is never free'd (so we don't need
67  * to remember which pointers point to malloc'ed memory).
68  */
69 
70 /*
71  * TRANSLATION_NOTE
72  * Only strings passed as arguments to the TRANSLATE macro need to
73  * be translated.
74  */
75 
76 #ifndef MNTTYPE_LOFS
77 #define	MNTTYPE_LOFS		"lofs"
78 #endif
79 
80 #define	EQ(s1, s2)		(strcmp(s1, s2) == 0)
81 #define	NEW(type)		xmalloc(sizeof (type))
82 #define	CLEAR(var)		(void) memset(&(var), 0, sizeof (var))
83 #define	MAX(a, b)		((a) > (b) ? (a) : (b))
84 #define	MAX3(a, b, c)		MAX(a, MAX(b, c))
85 #define	TRANSLATE(s)		new_string(gettext(s))
86 
87 #define	MAX_OPTIONS		36
88 #define	N_FSTYPES		20
89 #define	MOUNT_TABLE_ENTRIES	40	/* initial allocation */
90 #define	MSGBUF_SIZE		1024
91 #define	LINEBUF_SIZE		256	/* either input or output lines */
92 
93 #define	BLOCK_SIZE		512	/* when reporting in terms of blocks */
94 
95 #define	DEVNM_CMD		"devnm"
96 #define	FS_LIBPATH		"/usr/lib/fs/"
97 #define	MOUNT_TAB		"/etc/mnttab"
98 #define	VFS_TAB			"/etc/vfstab"
99 #define	REMOTE_FS		"/etc/dfs/fstypes"
100 
101 #define	NUL			'\0'
102 #define	FALSE			0
103 #define	TRUE			1
104 
105 /*
106  * Formatting constants
107  */
108 #define	IBCS2_FILESYSTEM_WIDTH	15	/* Truncate to match ISC/SCO */
109 #define	IBCS2_MOUNT_POINT_WIDTH	10	/* Truncate to match ISC/SCO */
110 #define	FILESYSTEM_WIDTH	20
111 #define	MOUNT_POINT_WIDTH	19
112 #define	SPECIAL_DEVICE_WIDTH	18
113 #define	FSTYPE_WIDTH		8
114 #define	BLOCK_WIDTH		8
115 #define	NFILES_WIDTH		8
116 #ifdef XPG4
117 #define	KBYTE_WIDTH		11
118 #define	AVAILABLE_WIDTH		10
119 #else
120 #define	KBYTE_WIDTH		7
121 #define	AVAILABLE_WIDTH		6
122 #endif
123 #define	SCALED_WIDTH		6
124 #define	CAPACITY_WIDTH		9
125 #define	BSIZE_WIDTH		6
126 #define	FRAGSIZE_WIDTH		7
127 #define	FSID_WIDTH		7
128 #define	FLAG_WIDTH		8
129 #define	NAMELEN_WIDTH		7
130 #define	MNT_SPEC_WIDTH		MOUNT_POINT_WIDTH + SPECIAL_DEVICE_WIDTH + 2
131 
132 /*
133  * Flags for the errmsg() function
134  */
135 #define	ERR_NOFLAGS		0x0
136 #define	ERR_NONAME		0x1	/* don't include the program name */
137 					/* as a prefix */
138 #define	ERR_FATAL		0x2	/* call exit after printing the */
139 					/* message */
140 #define	ERR_PERROR		0x4	/* append an errno explanation to */
141 					/* the message */
142 #define	ERR_USAGE		0x8	/* print the usage line after the */
143 					/* message */
144 
145 #define	NUMBER_WIDTH		40
146 
147 /*
148  * A numbuf_t is used when converting a number to a string representation
149  */
150 typedef char numbuf_t[ NUMBER_WIDTH ];
151 
152 /*
153  * We use bool_int instead of int to make clear which variables are
154  * supposed to be boolean
155  */
156 typedef int bool_int;
157 
158 struct mtab_entry {
159 	bool_int	mte_dev_is_valid;
160 	dev_t		mte_dev;
161 	bool_int	mte_ignore;	/* the "ignore" option was set */
162 	struct extmnttab	*mte_mount;
163 };
164 
165 
166 struct df_request {
167 	bool_int		dfr_valid;
168 	char			*dfr_cmd_arg;	/* what the user specified */
169 	struct mtab_entry	*dfr_mte;
170 	char			*dfr_fstype;
171 	int			dfr_index;	/* to make qsort stable	*/
172 };
173 
174 #define	DFR_MOUNT_POINT(dfrp)	(dfrp)->dfr_mte->mte_mount->mnt_mountp
175 #define	DFR_SPECIAL(dfrp)	(dfrp)->dfr_mte->mte_mount->mnt_special
176 #define	DFR_FSTYPE(dfrp)	(dfrp)->dfr_mte->mte_mount->mnt_fstype
177 #define	DFR_ISMOUNTEDFS(dfrp)	((dfrp)->dfr_mte != NULL)
178 
179 #define	DFRP(p)			((struct df_request *)(p))
180 
181 typedef void (*output_func)(struct df_request *, struct statvfs64 *);
182 
183 struct df_output {
184 	output_func	dfo_func;	/* function that will do the output */
185 	int		dfo_flags;
186 };
187 
188 /*
189  * Output flags
190  */
191 #define	DFO_NOFLAGS	0x0
192 #define	DFO_HEADER	0x1		/* output preceded by header */
193 #define	DFO_STATVFS	0x2		/* must do a statvfs64(2) */
194 
195 
196 static char	*program_name;
197 static char	df_options[MAX_OPTIONS] = "-";
198 static size_t	df_options_len = 1;
199 static char	*o_option_arg;			/* arg to the -o option */
200 static char	*FSType;
201 static char	*remote_fstypes[N_FSTYPES+1];	/* allocate an extra one */
202 						/* to use as a terminator */
203 
204 /*
205  * The following three variables support an in-memory copy of the mount table
206  * to speedup searches.
207  */
208 static struct mtab_entry	*mount_table;	/* array of mtab_entry's */
209 static size_t			mount_table_entries;
210 static size_t			mount_table_allocated_entries;
211 
212 static bool_int		F_option;
213 static bool_int		V_option;
214 static bool_int		P_option;	/* Added for XCU4 compliance */
215 static bool_int		Z_option;
216 static bool_int		v_option;
217 #ifdef	_iBCS2
218 char			*sysv3_set;
219 #endif /* _iBCS2 */
220 static bool_int		a_option;
221 static bool_int		b_option;
222 static bool_int		e_option;
223 static bool_int		g_option;
224 static bool_int		h_option;
225 static bool_int		k_option;
226 static bool_int		l_option;
227 static bool_int		n_option;
228 static bool_int		t_option;
229 static bool_int		o_option;
230 
231 static bool_int		tty_output;
232 static bool_int		use_scaling;
233 static int		scale;
234 
235 static void usage(void);
236 static void do_devnm(int, char **);
237 static void do_df(int, char **);
238 static void parse_options(int, char **);
239 static char *basename(char *);
240 
241 
242 /* ARGSUSED */
243 static void
244 dummy_error_handler(const char *fmt, va_list ap)
245 {
246 	/* Do nothing */
247 }
248 
249 static zfs_handle_t *(*_zfs_open)(const char *, int);
250 static void (*_zfs_close)(zfs_handle_t *);
251 static uint64_t (*_zfs_prop_get_int)(zfs_handle_t *, zfs_prop_t);
252 static void (*_zfs_set_error_handler)(void (*)(const char *, va_list));
253 
254 void
255 main(int argc, char *argv[])
256 {
257 	void *hdl;
258 
259 	(void) setlocale(LC_ALL, "");
260 
261 #if !defined(TEXT_DOMAIN)		/* Should be defined by cc -D */
262 #define	TEXT_DOMAIN "SYS_TEST"
263 #endif
264 	(void) textdomain(TEXT_DOMAIN);
265 
266 	program_name = basename(argv[0]);
267 
268 #ifdef	_iBCS2
269 	sysv3_set = getenv("SYSV3");
270 #endif	/* _iBCS2 */
271 
272 	/*
273 	 * Dynamically check for libzfs, in case the user hasn't installed the
274 	 * SUNWzfs packages.  A basic utility such as df shouldn't depend on
275 	 * optional filesystems.
276 	 */
277 	if ((hdl = dlopen("libzfs.so", RTLD_LAZY)) != NULL) {
278 		_zfs_set_error_handler = (void (*)())
279 		    dlsym(hdl, "zfs_set_error_handler");
280 		_zfs_open = (zfs_handle_t *(*)())dlsym(hdl, "zfs_open");
281 		_zfs_close = (void (*)())dlsym(hdl, "zfs_close");
282 		_zfs_prop_get_int = (uint64_t (*)())
283 		    dlsym(hdl, "zfs_prop_get_int");
284 
285 		if (_zfs_set_error_handler != NULL) {
286 			assert(_zfs_open != NULL);
287 			assert(_zfs_close != NULL);
288 			assert(_zfs_prop_get_int != NULL);
289 
290 			/*
291 			 * Disable ZFS error reporting, so we don't get messages
292 			 * like "can't open ..." under race conditions.
293 			 */
294 			_zfs_set_error_handler(dummy_error_handler);
295 		}
296 	}
297 
298 	if (EQ(program_name, DEVNM_CMD))
299 		do_devnm(argc, argv);
300 
301 	parse_options(argc, argv);
302 
303 	/*
304 	 * The k_option implies SunOS 4.x compatibility: when the special
305 	 * device name is too long the line will be split except when the
306 	 * output has been redirected.
307 	 * This is also valid for the -h option.
308 	 */
309 
310 	if (use_scaling || k_option || P_option || v_option)
311 		tty_output = isatty(1);
312 
313 	do_df(argc - optind, &argv[optind]);
314 	/* NOTREACHED */
315 }
316 
317 
318 /*
319  * Prints an error message to stderr.
320  */
321 /* VARARGS2 */
322 static void
323 errmsg(int flags, char *fmt, ...)
324 {
325 	char buf[MSGBUF_SIZE];
326 	va_list ap;
327 	int cc;
328 	int offset;
329 
330 	if (flags & ERR_NONAME)
331 		offset = 0;
332 	else
333 		offset = sprintf(buf, "%s: ", program_name);
334 
335 	va_start(ap, fmt);
336 	cc = vsprintf(&buf[offset], gettext(fmt), ap);
337 	offset += cc;
338 	va_end(ap);
339 
340 	if (flags & ERR_PERROR) {
341 		if (buf[offset-1] != ' ')
342 			(void) strcat(buf, " ");
343 		(void) strcat(buf, strerror(errno));
344 	}
345 	(void) fprintf(stderr, "%s\n", buf);
346 	if (flags & ERR_USAGE)
347 		usage();
348 	if (flags & ERR_FATAL)
349 		exit(1);
350 }
351 
352 
353 static void
354 usage()
355 {
356 #ifdef  XPG4
357 	errmsg(ERR_NONAME,
358 	"Usage: %s [-F FSType] [-abeghklntPVZ] [-o FSType-specific_options]"
359 		" [directory | block_device | resource]", program_name);
360 #else
361 	errmsg(ERR_NONAME,
362 	"Usage: %s [-F FSType] [-abeghklntVvZ] [-o FSType-specific_options]"
363 		" [directory | block_device | resource]", program_name);
364 #endif
365 	exit(1);
366 	/* NOTREACHED */
367 }
368 
369 
370 static char *
371 new_string(char *s)
372 {
373 	char *p = NULL;
374 
375 	if (s) {
376 		p = strdup(s);
377 		if (p)
378 			return (p);
379 		errmsg(ERR_FATAL, "out of memory");
380 		/* NOTREACHED */
381 	}
382 	return (p);
383 }
384 
385 
386 /*
387  * Allocate memory using malloc but terminate if the allocation fails
388  */
389 static void *
390 xmalloc(size_t size)
391 {
392 	void *p = malloc(size);
393 
394 	if (p)
395 		return (p);
396 	errmsg(ERR_FATAL, "out of memory");
397 	/* NOTREACHED */
398 }
399 
400 
401 /*
402  * Allocate memory using realloc but terminate if the allocation fails
403  */
404 static void *
405 xrealloc(void *ptr, size_t size)
406 {
407 	void *p = realloc(ptr, size);
408 
409 	if (p)
410 		return (p);
411 	errmsg(ERR_FATAL, "out of memory");
412 	/* NOTREACHED */
413 }
414 
415 
416 /*
417  * fopen the specified file for reading but terminate if the fopen fails
418  */
419 static FILE *
420 xfopen(char *file)
421 {
422 	FILE *fp = fopen(file, "r");
423 
424 	if (fp == NULL)
425 		errmsg(ERR_FATAL + ERR_PERROR, "failed to open %s:", file);
426 	return (fp);
427 }
428 
429 
430 /*
431  * Read remote file system types from REMOTE_FS into the
432  * remote_fstypes array.
433  */
434 static void
435 init_remote_fs()
436 {
437 	FILE	*fp;
438 	char	line_buf[LINEBUF_SIZE];
439 	size_t	fstype_index = 0;
440 
441 	if ((fp = fopen(REMOTE_FS, "r")) == NULL) {
442 		errmsg(ERR_NOFLAGS,
443 			"Warning: can't open %s, ignored", REMOTE_FS);
444 		return;
445 	}
446 
447 	while (fgets(line_buf, sizeof (line_buf), fp) != NULL) {
448 		char buf[LINEBUF_SIZE];
449 
450 		(void) sscanf(line_buf, "%s", buf);
451 		remote_fstypes[fstype_index++] = new_string(buf);
452 
453 		if (fstype_index == N_FSTYPES)
454 			break;
455 	}
456 	(void) fclose(fp);
457 }
458 
459 
460 /*
461  * Returns TRUE if fstype is a remote file system type;
462  * otherwise, returns FALSE.
463  */
464 static int
465 is_remote_fs(char *fstype)
466 {
467 	char **p;
468 	static bool_int remote_fs_initialized;
469 
470 	if (! remote_fs_initialized) {
471 		init_remote_fs();
472 		remote_fs_initialized = TRUE;
473 	}
474 
475 	for (p = remote_fstypes; *p; p++)
476 		if (EQ(fstype, *p))
477 			return (TRUE);
478 	return (FALSE);
479 }
480 
481 
482 static char *
483 basename(char *s)
484 {
485 	char *p = strrchr(s, '/');
486 
487 	return (p ? p+1 : s);
488 }
489 
490 
491 /*
492  * Create a new "struct extmnttab" and make sure that its fields point
493  * to malloc'ed memory
494  */
495 static struct extmnttab *
496 mntdup(struct extmnttab *old)
497 {
498 	struct extmnttab *new = NEW(struct extmnttab);
499 
500 	new->mnt_special = new_string(old->mnt_special);
501 	new->mnt_mountp  = new_string(old->mnt_mountp);
502 	new->mnt_fstype  = new_string(old->mnt_fstype);
503 	new->mnt_mntopts = new_string(old->mnt_mntopts);
504 	new->mnt_time    = new_string(old->mnt_time);
505 	new->mnt_major   = old->mnt_major;
506 	new->mnt_minor   = old->mnt_minor;
507 	return (new);
508 }
509 
510 
511 static void
512 mtab_error(char *mtab_file, int status)
513 {
514 	if (status == MNT_TOOLONG)
515 		errmsg(ERR_NOFLAGS, "a line in %s exceeds %d characters",
516 			mtab_file, MNT_LINE_MAX);
517 	else if (status == MNT_TOOMANY)
518 		errmsg(ERR_NOFLAGS,
519 			"a line in %s has too many fields", mtab_file);
520 	else if (status == MNT_TOOFEW)
521 		errmsg(ERR_NOFLAGS,
522 			"a line in %s has too few fields", mtab_file);
523 	else
524 		errmsg(ERR_NOFLAGS,
525 			"error while reading %s: %d", mtab_file, status);
526 	exit(1);
527 	/* NOTREACHED */
528 }
529 
530 
531 /*
532  * Read the mount table from the specified file.
533  * We keep the table in memory for faster lookups.
534  */
535 static void
536 mtab_read_file()
537 {
538 	char		*mtab_file = MOUNT_TAB;
539 	FILE		*fp;
540 	struct extmnttab	mtab;
541 	int		status;
542 
543 	fp = xfopen(mtab_file);
544 
545 	resetmnttab(fp);
546 	mount_table_allocated_entries = MOUNT_TABLE_ENTRIES;
547 	mount_table_entries = 0;
548 	mount_table = xmalloc(
549 		mount_table_allocated_entries * sizeof (struct mtab_entry));
550 
551 	while ((status = getextmntent(fp, &mtab, sizeof (struct extmnttab)))
552 		== 0) {
553 		struct mtab_entry *mtep;
554 
555 		if (mount_table_entries == mount_table_allocated_entries) {
556 			mount_table_allocated_entries += MOUNT_TABLE_ENTRIES;
557 			mount_table = xrealloc(mount_table,
558 				mount_table_allocated_entries *
559 					sizeof (struct mtab_entry));
560 		}
561 		mtep = &mount_table[mount_table_entries++];
562 		mtep->mte_mount = mntdup(&mtab);
563 		mtep->mte_dev_is_valid = FALSE;
564 		mtep->mte_ignore = (hasmntopt((struct mnttab *)&mtab,
565 			MNTOPT_IGNORE) != NULL);
566 	}
567 
568 	(void) fclose(fp);
569 
570 	if (status == -1)			/* reached EOF */
571 		return;
572 	mtab_error(mtab_file, status);
573 	/* NOTREACHED */
574 }
575 
576 
577 /*
578  * We use this macro when we want to record the option for the purpose of
579  * passing it to the FS-specific df
580  */
581 #define	SET_OPTION(opt)		opt##_option = TRUE, \
582 				df_options[df_options_len++] = arg
583 
584 static void
585 parse_options(int argc, char *argv[])
586 {
587 	int arg;
588 
589 	opterr = 0;	/* getopt shouldn't complain about unknown options */
590 
591 #ifdef XPG4
592 	while ((arg = getopt(argc, argv, "F:o:abehkVtgnlPZ")) != EOF) {
593 #else
594 	while ((arg = getopt(argc, argv, "F:o:abehkVtgnlvZ")) != EOF) {
595 #endif
596 		if (arg == 'F') {
597 			if (F_option)
598 				errmsg(ERR_FATAL + ERR_USAGE,
599 					"more than one FSType specified");
600 			F_option = 1;
601 			FSType = optarg;
602 		} else if (arg == 'V' && ! V_option) {
603 			V_option = TRUE;
604 		} else if (arg == 'v' && ! v_option) {
605 			v_option = TRUE;
606 #ifdef XPG4
607 		} else if (arg == 'P' && ! P_option) {
608 			SET_OPTION(P);
609 #endif
610 		} else if (arg == 'a' && ! a_option) {
611 			SET_OPTION(a);
612 		} else if (arg == 'b' && ! b_option) {
613 			SET_OPTION(b);
614 		} else if (arg == 'e' && ! e_option) {
615 			SET_OPTION(e);
616 		} else if (arg == 'g' && ! g_option) {
617 			SET_OPTION(g);
618 		} else if (arg == 'h') {
619 			use_scaling = TRUE;
620 			scale = 1024;
621 		} else if (arg == 'k' && ! k_option) {
622 			SET_OPTION(k);
623 		} else if (arg == 'l' && ! l_option) {
624 			SET_OPTION(l);
625 		} else if (arg == 'n' && ! n_option) {
626 			SET_OPTION(n);
627 		} else if (arg == 't' && ! t_option) {
628 			SET_OPTION(t);
629 		} else if (arg == 'o') {
630 			if (o_option)
631 				errmsg(ERR_FATAL + ERR_USAGE,
632 				"the -o option can only be specified once");
633 			o_option = TRUE;
634 			o_option_arg = optarg;
635 		} else if (arg == 'Z') {
636 			SET_OPTION(Z);
637 		} else if (arg == '?') {
638 			errmsg(ERR_USAGE, "unknown option: %c", optopt);
639 		}
640 	}
641 
642 	/*
643 	 * Option sanity checks
644 	 */
645 	if (g_option && o_option)
646 		errmsg(ERR_FATAL, "-o and -g options are incompatible");
647 	if (l_option && o_option)
648 		errmsg(ERR_FATAL, "-o and -l options are incompatible");
649 	if (n_option && o_option)
650 		errmsg(ERR_FATAL, "-o and -n options are incompatible");
651 	if (use_scaling && o_option)
652 		errmsg(ERR_FATAL, "-o and -h options are incompatible");
653 }
654 
655 
656 
657 /*
658  * Check if the user-specified argument is a resource name.
659  * A resource name is whatever is placed in the mnt_special field of
660  * struct mnttab. In the case of NFS, a resource name has the form
661  * hostname:pathname
662  * We try to find an exact match between the user-specified argument
663  * and the mnt_special field of a mount table entry.
664  * We also use the heuristic of removing the basename from the user-specified
665  * argument and repeating the test until we get a match. This works
666  * fine for NFS but may fail for other remote file system types. However,
667  * it is guaranteed that the function will not fail if the user specifies
668  * the exact resource name.
669  * If successful, this function sets the 'dfr_mte' field of '*dfrp'
670  */
671 static void
672 resource_mount_entry(struct df_request *dfrp)
673 {
674 	char *name;
675 
676 	/*
677 	 * We need our own copy since we will modify the string
678 	 */
679 	name = new_string(dfrp->dfr_cmd_arg);
680 
681 	for (;;) {
682 		char *p;
683 		int i;
684 
685 		/*
686 		 * Compare against all known mount points.
687 		 * We start from the most recent mount, which is at the
688 		 * end of the array.
689 		 */
690 		for (i = mount_table_entries - 1; i >= 0; i--) {
691 			struct mtab_entry *mtep = &mount_table[i];
692 
693 			if (EQ(name, mtep->mte_mount->mnt_special)) {
694 				dfrp->dfr_mte = mtep;
695 				break;
696 			}
697 		}
698 
699 		/*
700 		 * Remove the last component of the pathname.
701 		 * If there is no such component, this is not a resource name.
702 		 */
703 		p = strrchr(name, '/');
704 		if (p == NULL)
705 			break;
706 		*p = NUL;
707 	}
708 }
709 
710 
711 
712 /*
713  * Try to match the command line argument which is a block special device
714  * with the special device of one of the mounted file systems.
715  * If one is found, set the appropriate field of 'dfrp' to the mount
716  * table entry.
717  */
718 static void
719 bdev_mount_entry(struct df_request *dfrp)
720 {
721 	int i;
722 	char *special = dfrp->dfr_cmd_arg;
723 
724 	/*
725 	 * Compare against all known mount points.
726 	 * We start from the most recent mount, which is at the
727 	 * end of the array.
728 	 */
729 	for (i = mount_table_entries - 1; i >= 0; i--) {
730 		struct mtab_entry *mtep = &mount_table[i];
731 
732 		if (EQ(special, mtep->mte_mount->mnt_special)) {
733 			dfrp->dfr_mte = mtep;
734 			break;
735 		}
736 	}
737 }
738 
739 static struct mtab_entry *
740 devid_matches(int i, dev_t devno)
741 {
742 	struct mtab_entry	*mtep = &mount_table[i];
743 	struct extmnttab	*mtp = mtep->mte_mount;
744 	/* int	len = strlen(mtp->mnt_mountp); */
745 
746 	if (EQ(mtp->mnt_fstype, MNTTYPE_SWAP))
747 		return (NULL);
748 	/*
749 	 * check if device numbers match. If there is a cached device number
750 	 * in the mtab_entry, use it, otherwise get the device number
751 	 * either from the mnttab entry or by stat'ing the mount point.
752 	 */
753 	if (! mtep->mte_dev_is_valid) {
754 		struct stat64 st;
755 		dev_t dev = NODEV;
756 
757 		dev = makedev(mtp->mnt_major, mtp->mnt_minor);
758 		if (dev == 0)
759 			dev = NODEV;
760 		if (dev == NODEV) {
761 			if (stat64(mtp->mnt_mountp, &st) == -1) {
762 				return (NULL);
763 			} else {
764 				dev = st.st_dev;
765 			}
766 		}
767 		mtep->mte_dev = dev;
768 		mtep->mte_dev_is_valid = TRUE;
769 	}
770 	if (mtep->mte_dev == devno) {
771 		return (mtep);
772 	}
773 	return (NULL);
774 }
775 
776 /*
777  * Find the mount point under which the user-specified path resides
778  * and set the 'dfr_mte' field of '*dfrp' to point to the mount table entry.
779  */
780 static void
781 path_mount_entry(struct df_request *dfrp, dev_t devno)
782 {
783 	char			dirpath[MAXPATHLEN];
784 	char			*dir = dfrp->dfr_cmd_arg;
785 	struct mtab_entry	*match, *tmatch;
786 	int i;
787 
788 	/*
789 	 * Expand the given path to get a canonical version (i.e. an absolute
790 	 * path without symbolic links).
791 	 */
792 	if (realpath(dir, dirpath) == NULL) {
793 		errmsg(ERR_PERROR, "cannot canonicalize %s:", dir);
794 		return;
795 	}
796 	/*
797 	 * If the mnt point is lofs, search from the top of entries from
798 	 * /etc/mnttab and return the first entry that matches the devid
799 	 * For non-lofs mount points, return the first entry from the bottom
800 	 * of the entries in /etc/mnttab that matches on the devid field
801 	 */
802 	match = NULL;
803 	if (dfrp->dfr_fstype && EQ(dfrp->dfr_fstype, MNTTYPE_LOFS)) {
804 		for (i = 0; i < mount_table_entries; i++) {
805 			if (match = devid_matches(i, devno))
806 				break;
807 		}
808 	} else {
809 		for (i = mount_table_entries - 1; i >= 0; i--) {
810 			if (tmatch = devid_matches(i, devno)) {
811 				/*
812 				 * If executing in a zone, there might be lofs
813 				 * mounts for which the real mount point is
814 				 * invisible; accept the "best fit" for this
815 				 * devid.
816 				 */
817 				match = tmatch;
818 				if (!EQ(match->mte_mount->mnt_fstype,
819 					MNTTYPE_LOFS)) {
820 					break;
821 				}
822 			}
823 		}
824 	}
825 	if (! match) {
826 		errmsg(ERR_NOFLAGS,
827 			"Could not find mount point for %s", dir);
828 		return;
829 	}
830 	dfrp->dfr_mte = match;
831 }
832 
833 /*
834  * Execute a single FS-specific df command for all given requests
835  * Return 0 if successful, 1 otherwise.
836  */
837 static int
838 run_fs_specific_df(struct df_request request_list[], int entries)
839 {
840 	int	i;
841 	int	argv_index;
842 	char	**argv;
843 	size_t	size;
844 	pid_t	pid;
845 	int	status;
846 	char	cmd_path[MAXPATHLEN];
847 	char	*fstype;
848 
849 	if (entries == 0)
850 		return (0);
851 
852 	fstype = request_list[0].dfr_fstype;
853 
854 	if (F_option && ! EQ(FSType, fstype))
855 		return (0);
856 
857 	(void) sprintf(cmd_path, "%s%s/df", FS_LIBPATH, fstype);
858 	/*
859 	 * Argv entries:
860 	 *		1 for the path
861 	 *		2 for -o <options>
862 	 *		1 for the generic options that we propagate
863 	 *		1 for the terminating NULL pointer
864 	 *		n for the number of user-specified arguments
865 	 */
866 	size = (5 + entries) * sizeof (char *);
867 	argv = xmalloc(size);
868 	(void) memset(argv, 0, size);
869 
870 	argv[0] = cmd_path;
871 	argv_index = 1;
872 	if (o_option) {
873 		argv[argv_index++] = "-o";
874 		argv[argv_index++] = o_option_arg;
875 	}
876 
877 	/*
878 	 * Check if we need to propagate any generic options
879 	 */
880 	if (df_options_len > 1)
881 		argv[argv_index++] = df_options;
882 
883 	/*
884 	 * If there is a user-specified path, we pass that to the
885 	 * FS-specific df. Otherwise, we are guaranteed to have a mount
886 	 * point, since a request without a user path implies that
887 	 * we are reporting only on mounted file systems.
888 	 */
889 	for (i = 0; i < entries; i++) {
890 		struct df_request *dfrp = &request_list[i];
891 
892 		argv[argv_index++] = (dfrp->dfr_cmd_arg == NULL)
893 						? DFR_MOUNT_POINT(dfrp)
894 						: dfrp->dfr_cmd_arg;
895 	}
896 
897 	if (V_option) {
898 		for (i = 0; i < argv_index-1; i++)
899 			(void) printf("%s ", argv[i]);
900 		(void) printf("%s\n", argv[i]);
901 		return (0);
902 	}
903 
904 	pid = fork();
905 
906 	if (pid == -1) {
907 		errmsg(ERR_PERROR, "cannot fork process:");
908 		return (1);
909 	} else if (pid == 0) {
910 		(void) execv(cmd_path, argv);
911 		if (errno == ENOENT)
912 			errmsg(ERR_NOFLAGS,
913 				"operation not applicable for FSType %s",
914 					fstype);
915 		else
916 			errmsg(ERR_PERROR, "cannot execute %s:", cmd_path);
917 		exit(2);
918 	}
919 
920 	/*
921 	 * Reap the child
922 	 */
923 	for (;;) {
924 		pid_t wpid = waitpid(pid, &status, 0);
925 
926 		if (wpid == -1)
927 			if (errno == EINTR)
928 				continue;
929 			else {
930 				errmsg(ERR_PERROR, "waitpid error:");
931 				return (1);
932 			}
933 		else
934 			break;
935 	}
936 
937 	return ((WIFEXITED(status) && WEXITSTATUS(status) == 0) ? 0 : 1);
938 }
939 
940 
941 
942 /*
943  * Remove from the request list all requests that do not apply.
944  * Notice that the subsequent processing of the requests depends on
945  * the sanity checking performed by this function.
946  */
947 static int
948 prune_list(struct df_request request_list[],
949 		size_t n_requests,
950 		size_t *valid_requests)
951 {
952 	size_t	i;
953 	size_t	n_valid = 0;
954 	int	errors = 0;
955 
956 	for (i = 0; i < n_requests; i++) {
957 		struct df_request *dfrp = &request_list[i];
958 
959 		/*
960 		 * Skip file systems that are not mounted if either the
961 		 * -l or -n options were specified. If none of these options
962 		 * are present, the appropriate FS-specific df will be invoked.
963 		 */
964 		if (! DFR_ISMOUNTEDFS(dfrp)) {
965 			if (l_option || n_option) {
966 				errmsg(ERR_NOFLAGS,
967 		"%s option incompatible with unmounted special device (%s)",
968 			l_option ? "-l" : "-n", dfrp->dfr_cmd_arg);
969 				dfrp->dfr_valid = FALSE;
970 				errors++;
971 			}
972 			else
973 				n_valid++;
974 			continue;
975 		}
976 
977 		/*
978 		 * Check for inconsistency between the argument of -F and
979 		 * the actual file system type.
980 		 * If there is an inconsistency and the user specified a
981 		 * path, this is an error since we are asked to interpret
982 		 * the path using the wrong file system type. If there is
983 		 * no path associated with this request, we quietly ignore it.
984 		 */
985 		if (F_option && ! EQ(dfrp->dfr_fstype, FSType)) {
986 			dfrp->dfr_valid = FALSE;
987 			if (dfrp->dfr_cmd_arg != NULL) {
988 				errmsg(ERR_NOFLAGS,
989 				"Warning: %s mounted as a %s file system",
990 					dfrp->dfr_cmd_arg, dfrp->dfr_fstype);
991 				errors++;
992 			}
993 			continue;
994 		}
995 
996 		/*
997 		 * Skip remote file systems if the -l option is present
998 		 */
999 		if (l_option && is_remote_fs(dfrp->dfr_fstype)) {
1000 			if (dfrp->dfr_cmd_arg != NULL) {
1001 				errmsg(ERR_NOFLAGS,
1002 				"Warning: %s is not a local file system",
1003 					dfrp->dfr_cmd_arg);
1004 				errors++;
1005 			}
1006 			dfrp->dfr_valid = FALSE;
1007 			continue;
1008 		}
1009 
1010 		/*
1011 		 * Skip file systems mounted as "ignore" unless the -a option
1012 		 * is present, or the user explicitly specified them on
1013 		 * the command line.
1014 		 */
1015 		if (dfrp->dfr_mte->mte_ignore &&
1016 			! (a_option || dfrp->dfr_cmd_arg)) {
1017 			dfrp->dfr_valid = FALSE;
1018 			continue;
1019 		}
1020 
1021 		n_valid++;
1022 	}
1023 	*valid_requests = n_valid;
1024 	return (errors);
1025 }
1026 
1027 
1028 /*
1029  * Print the appropriate header for the requested output format.
1030  * Options are checked in order of their precedence.
1031  */
1032 static void
1033 print_header()
1034 {
1035 	if (use_scaling) { /* this comes from the -h option */
1036 		int arg = 'h';
1037 
1038 		(void) printf("%-*s %*s %*s %*s %-*s %s\n",
1039 			FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1040 #ifdef XPG4
1041 			SCALED_WIDTH, TRANSLATE("Size"),
1042 			SCALED_WIDTH, TRANSLATE("Used"),
1043 			AVAILABLE_WIDTH, TRANSLATE("Available"),
1044 			CAPACITY_WIDTH, TRANSLATE("Capacity"),
1045 #else
1046 			SCALED_WIDTH, TRANSLATE("size"),
1047 			SCALED_WIDTH, TRANSLATE("used"),
1048 			AVAILABLE_WIDTH, TRANSLATE("avail"),
1049 			CAPACITY_WIDTH, TRANSLATE("capacity"),
1050 #endif
1051 			TRANSLATE("Mounted on"));
1052 		SET_OPTION(h);
1053 		return;
1054 	}
1055 	if (k_option) {
1056 		int arg = 'h';
1057 
1058 		(void) printf(gettext("%-*s %*s %*s %*s %-*s %s\n"),
1059 			FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1060 #ifdef XPG4
1061 			KBYTE_WIDTH, TRANSLATE("1024-blocks"),
1062 			KBYTE_WIDTH, TRANSLATE("Used"),
1063 			KBYTE_WIDTH, TRANSLATE("Available"),
1064 			CAPACITY_WIDTH, TRANSLATE("Capacity"),
1065 #else
1066 			KBYTE_WIDTH, TRANSLATE("kbytes"),
1067 			KBYTE_WIDTH, TRANSLATE("used"),
1068 			KBYTE_WIDTH, TRANSLATE("avail"),
1069 			CAPACITY_WIDTH, TRANSLATE("capacity"),
1070 #endif
1071 			TRANSLATE("Mounted on"));
1072 		SET_OPTION(h);
1073 		return;
1074 	}
1075 	/* Added for XCU4 compliance */
1076 	if (P_option) {
1077 		int arg = 'h';
1078 
1079 		(void) printf(gettext("%-*s %*s %*s %*s %-*s %s\n"),
1080 			FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1081 			KBYTE_WIDTH, TRANSLATE("512-blocks"),
1082 			KBYTE_WIDTH, TRANSLATE("Used"),
1083 			KBYTE_WIDTH, TRANSLATE("Available"),
1084 			CAPACITY_WIDTH, TRANSLATE("Capacity"),
1085 			TRANSLATE("Mounted on"));
1086 
1087 		SET_OPTION(h);
1088 		return;
1089 	}
1090 	/* End XCU4 */
1091 	if (v_option) {
1092 		(void) printf("%-*s %-*s %*s %*s %*s %-*s\n",
1093 			IBCS2_MOUNT_POINT_WIDTH, TRANSLATE("Mount Dir"),
1094 			IBCS2_FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1095 			BLOCK_WIDTH, TRANSLATE("blocks"),
1096 			BLOCK_WIDTH, TRANSLATE("used"),
1097 			BLOCK_WIDTH, TRANSLATE("free"),
1098 			CAPACITY_WIDTH, TRANSLATE(" %used"));
1099 		return;
1100 	}
1101 	if (e_option) {
1102 		(void) printf(gettext("%-*s %*s\n"),
1103 			FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1104 			BLOCK_WIDTH, TRANSLATE("ifree"));
1105 		return;
1106 	}
1107 	if (b_option) {
1108 		(void) printf(gettext("%-*s %*s\n"),
1109 			FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1110 			BLOCK_WIDTH, TRANSLATE("avail"));
1111 		return;
1112 	}
1113 }
1114 
1115 
1116 /*
1117  * Convert an unsigned long long to a string representation and place the
1118  * result in the caller-supplied buffer.
1119  * The given number is in units of "unit_from" size, but the
1120  * converted number will be in units of "unit_to" size. The unit sizes
1121  * must be powers of 2.
1122  * The value "(unsigned long long)-1" is a special case and is always
1123  * converted to "-1".
1124  * Returns a pointer to the caller-supplied buffer.
1125  */
1126 static char *
1127 number_to_string(
1128 			char *buf,		/* put the result here */
1129 			unsigned long long number, /* convert this number */
1130 			int unit_from,		/* from units of this size */
1131 			int unit_to)		/* to units of this size */
1132 {
1133 	if ((long long)number == (long long)-1)
1134 		(void) strcpy(buf, "-1");
1135 	else {
1136 		if (unit_from == unit_to)
1137 			(void) sprintf(buf, "%llu", number);
1138 		else if (unit_from < unit_to)
1139 			(void) sprintf(buf, "%llu",
1140 			    number / (unsigned long long)(unit_to / unit_from));
1141 		else
1142 			(void) sprintf(buf, "%llu",
1143 			    number * (unsigned long long)(unit_from / unit_to));
1144 	}
1145 	return (buf);
1146 }
1147 
1148 /*
1149  * Convert an unsigned long long to a string representation and place the
1150  * result in the caller-supplied buffer.
1151  * The given number is in units of "unit_from" size,
1152  * this will first be converted to a number in 1024 or 1000 byte size,
1153  * depending on the scaling factor.
1154  * Then the number is scaled down until it is small enough to be in a good
1155  * human readable format i.e. in the range 0 thru scale-1.
1156  * If it's smaller than 10 there's room enough to provide one decimal place.
1157  * The value "(unsigned long long)-1" is a special case and is always
1158  * converted to "-1".
1159  * Returns a pointer to the caller-supplied buffer.
1160  */
1161 static char *
1162 number_to_scaled_string(
1163 			numbuf_t buf,		/* put the result here */
1164 			unsigned long long number, /* convert this number */
1165 			int unit_from,
1166 			int scale)
1167 {
1168 	unsigned long long save = 0;
1169 	char *M = "KMGTPE"; /* Measurement: kilo, mega, giga, tera, peta, exa */
1170 	char *uom = M;    /* unit of measurement, initially 'K' (=M[0]) */
1171 
1172 	if ((long long)number == (long long)-1) {
1173 		(void) strcpy(buf, "-1");
1174 		return (buf);
1175 	}
1176 
1177 	/*
1178 	 * Convert number from unit_from to given scale (1024 or 1000).
1179 	 * This means multiply number by unit_from and divide by scale.
1180 	 *
1181 	 * Would like to multiply by unit_from and then divide by scale,
1182 	 * but if the first multiplication would overflow, then need to
1183 	 * divide by scale and then multiply by unit_from.
1184 	 */
1185 	if (number > (UINT64_MAX / (unsigned long long)unit_from)) {
1186 		number = (number / (unsigned long long)scale) *
1187 		    (unsigned long long)unit_from;
1188 	} else {
1189 		number = (number * (unsigned long long)unit_from) /
1190 		    (unsigned long long)scale;
1191 	}
1192 
1193 	/*
1194 	 * Now we have number as a count of scale units.
1195 	 * Stop scaling when we reached exa bytes, then something is
1196 	 * probably wrong with our number.
1197 	 */
1198 
1199 	while ((number >= scale) && (*uom != 'E')) {
1200 		uom++; /* next unit of measurement */
1201 		save = number;
1202 		number = (number + (scale / 2)) / scale;
1203 	}
1204 	/* check if we should output a decimal place after the point */
1205 	if (save && ((save / scale) < 10)) {
1206 		/* sprintf() will round for us */
1207 		float fnum = (float)save / scale;
1208 		(void) sprintf(buf, "%2.1f%c", fnum, *uom);
1209 	} else {
1210 		(void) sprintf(buf, "%4llu%c", number, *uom);
1211 	}
1212 	return (buf);
1213 }
1214 
1215 /*
1216  * The statvfs() implementation allows us to return only two values, the total
1217  * number of blocks and the number of blocks free.  The equation 'used = total -
1218  * free' will not work for ZFS filesystems, due to the nature of pooled storage.
1219  * We choose to return values in the statvfs structure that will produce correct
1220  * results for 'used' and 'available', but not 'total'.  This function will open
1221  * the underlying ZFS dataset if necessary and get the real value.
1222  */
1223 static void
1224 adjust_total_blocks(struct df_request *dfrp, fsblkcnt64_t *total,
1225     uint64_t blocksize)
1226 {
1227 	zfs_handle_t	*zhp;
1228 	char *dataset, *slash;
1229 	uint64_t quota;
1230 
1231 	if (strcmp(DFR_FSTYPE(dfrp), MNTTYPE_ZFS) != 0 ||
1232 	    _zfs_open == NULL)
1233 		return;
1234 
1235 	/*
1236 	 * We want to get the total size for this filesystem as bounded by any
1237 	 * quotas. In order to do this, we start at the current filesystem and
1238 	 * work upwards until we find a dataset with a quota.  If we reach the
1239 	 * pool itself, then the total space is the amount used plus the amount
1240 	 * available.
1241 	 */
1242 	if ((dataset = strdup(DFR_SPECIAL(dfrp))) == NULL)
1243 		return;
1244 
1245 	slash = dataset + strlen(dataset);
1246 	do {
1247 		*slash = '\0';
1248 
1249 		if ((zhp = _zfs_open(dataset, ZFS_TYPE_ANY)) == NULL) {
1250 			free(dataset);
1251 			return;
1252 		}
1253 
1254 		if ((quota = _zfs_prop_get_int(zhp, ZFS_PROP_QUOTA)) != 0) {
1255 			*total = quota / blocksize;
1256 			_zfs_close(zhp);
1257 			free(dataset);
1258 			return;
1259 		}
1260 
1261 		_zfs_close(zhp);
1262 
1263 	} while ((slash = strrchr(dataset, '/')) != NULL);
1264 
1265 
1266 	if ((zhp = _zfs_open(dataset, ZFS_TYPE_ANY)) == NULL) {
1267 		free(dataset);
1268 		return;
1269 	}
1270 
1271 	*total = (_zfs_prop_get_int(zhp, ZFS_PROP_USED) +
1272 	    _zfs_prop_get_int(zhp, ZFS_PROP_AVAILABLE)) / blocksize;
1273 
1274 	_zfs_close(zhp);
1275 	free(dataset);
1276 }
1277 
1278 /*
1279  * The output will appear properly columnized regardless of the names of
1280  * the various fields
1281  */
1282 static void
1283 g_output(struct df_request *dfrp, struct statvfs64 *fsp)
1284 {
1285 	fsblkcnt64_t	available_blocks	= fsp->f_bavail;
1286 	fsblkcnt64_t	total_blocks = fsp->f_blocks;
1287 	numbuf_t	total_blocks_buf;
1288 	numbuf_t	total_files_buf;
1289 	numbuf_t	free_blocks_buf;
1290 	numbuf_t	available_blocks_buf;
1291 	numbuf_t	free_files_buf;
1292 	numbuf_t	fname_buf;
1293 	char		*temp_buf;
1294 
1295 #define	DEFINE_STR_LEN(var)			\
1296 	static char *var##_str;			\
1297 	static size_t var##_len
1298 
1299 #define	SET_STR_LEN(name, var)\
1300 	if (! var##_str) {\
1301 		var##_str = TRANSLATE(name); \
1302 		var##_len = strlen(var##_str); \
1303 	}
1304 
1305 	DEFINE_STR_LEN(block_size);
1306 	DEFINE_STR_LEN(frag_size);
1307 	DEFINE_STR_LEN(total_blocks);
1308 	DEFINE_STR_LEN(free_blocks);
1309 	DEFINE_STR_LEN(available);
1310 	DEFINE_STR_LEN(total_files);
1311 	DEFINE_STR_LEN(free_files);
1312 	DEFINE_STR_LEN(fstype);
1313 	DEFINE_STR_LEN(fsys_id);
1314 	DEFINE_STR_LEN(fname);
1315 	DEFINE_STR_LEN(flag);
1316 
1317 	/*
1318 	 * TRANSLATION_NOTE
1319 	 * The first argument of each of the following macro invocations is a
1320 	 * string that needs to be translated.
1321 	 */
1322 	SET_STR_LEN("block size", block_size);
1323 	SET_STR_LEN("frag size", frag_size);
1324 	SET_STR_LEN("total blocks", total_blocks);
1325 	SET_STR_LEN("free blocks", free_blocks);
1326 	SET_STR_LEN("available", available);
1327 	SET_STR_LEN("total files", total_files);
1328 	SET_STR_LEN("free files", free_files);
1329 	SET_STR_LEN("fstype", fstype);
1330 	SET_STR_LEN("filesys id", fsys_id);
1331 	SET_STR_LEN("filename length", fname);
1332 	SET_STR_LEN("flag", flag);
1333 
1334 #define	NCOL1_WIDTH	(int)MAX3(BLOCK_WIDTH, NFILES_WIDTH, FSTYPE_WIDTH)
1335 #define	NCOL2_WIDTH	(int)MAX3(BLOCK_WIDTH, FSID_WIDTH, FLAG_WIDTH) + 2
1336 #define	NCOL3_WIDTH	(int)MAX3(BSIZE_WIDTH, BLOCK_WIDTH, NAMELEN_WIDTH)
1337 #define	NCOL4_WIDTH	(int)MAX(FRAGSIZE_WIDTH, NFILES_WIDTH)
1338 
1339 #define	SCOL1_WIDTH	(int)MAX3(total_blocks_len, free_files_len, fstype_len)
1340 #define	SCOL2_WIDTH	(int)MAX3(free_blocks_len, fsys_id_len, flag_len)
1341 #define	SCOL3_WIDTH	(int)MAX3(block_size_len, available_len, fname_len)
1342 #define	SCOL4_WIDTH	(int)MAX(frag_size_len, total_files_len)
1343 
1344 	temp_buf = xmalloc(
1345 	    MAX(MOUNT_POINT_WIDTH, strlen(DFR_MOUNT_POINT(dfrp)))
1346 	    + MAX(SPECIAL_DEVICE_WIDTH, strlen(DFR_SPECIAL(dfrp)))
1347 	    + 20); /* plus slop - nulls & formatting */
1348 	(void) sprintf(temp_buf, "%-*s(%-*s):",
1349 		MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1350 		SPECIAL_DEVICE_WIDTH, DFR_SPECIAL(dfrp));
1351 
1352 	(void) printf("%-*s %*lu %-*s %*lu %-*s\n",
1353 	NCOL1_WIDTH + 1 + SCOL1_WIDTH + 1 + NCOL2_WIDTH + 1 +  SCOL2_WIDTH,
1354 		temp_buf,
1355 	NCOL3_WIDTH, fsp->f_bsize, SCOL3_WIDTH, block_size_str,
1356 	NCOL4_WIDTH, fsp->f_frsize, SCOL4_WIDTH, frag_size_str);
1357 	free(temp_buf);
1358 
1359 	/*
1360 	 * Adjust available_blocks value -  it can be less than 0 on
1361 	 * a 4.x file system. Reset it to 0 in order to avoid printing
1362 	 * negative numbers.
1363 	 */
1364 	if ((long long)available_blocks < (long long)0)
1365 		available_blocks = (fsblkcnt64_t)0;
1366 
1367 	adjust_total_blocks(dfrp, &total_blocks, fsp->f_frsize);
1368 
1369 	(void) printf("%*s %-*s %*s %-*s %*s %-*s %*s %-*s\n",
1370 		NCOL1_WIDTH, number_to_string(total_blocks_buf,
1371 					total_blocks, fsp->f_frsize, 512),
1372 			SCOL1_WIDTH, total_blocks_str,
1373 		NCOL2_WIDTH, number_to_string(free_blocks_buf,
1374 					fsp->f_bfree, fsp->f_frsize, 512),
1375 			SCOL2_WIDTH, free_blocks_str,
1376 		NCOL3_WIDTH, number_to_string(available_blocks_buf,
1377 					available_blocks, fsp->f_frsize, 512),
1378 			SCOL3_WIDTH, available_str,
1379 		NCOL4_WIDTH, number_to_string(total_files_buf,
1380 					fsp->f_files, 1, 1),
1381 			SCOL4_WIDTH, total_files_str);
1382 
1383 	(void) printf("%*s %-*s %*lu %-*s %s\n",
1384 		NCOL1_WIDTH, number_to_string(free_files_buf,
1385 					fsp->f_ffree, 1, 1),
1386 			SCOL1_WIDTH, free_files_str,
1387 		NCOL2_WIDTH, fsp->f_fsid, SCOL2_WIDTH, fsys_id_str,
1388 		fsp->f_fstr);
1389 
1390 	(void) printf("%*s %-*s %#*.*lx %-*s %*s %-*s\n\n",
1391 		NCOL1_WIDTH, fsp->f_basetype, SCOL1_WIDTH, fstype_str,
1392 		NCOL2_WIDTH, NCOL2_WIDTH-2, fsp->f_flag, SCOL2_WIDTH, flag_str,
1393 		NCOL3_WIDTH, number_to_string(fname_buf,
1394 			(unsigned long long)fsp->f_namemax, 1, 1),
1395 			SCOL3_WIDTH, fname_str);
1396 }
1397 
1398 
1399 static void
1400 k_output(struct df_request *dfrp, struct statvfs64 *fsp)
1401 {
1402 	fsblkcnt64_t total_blocks		= fsp->f_blocks;
1403 	fsblkcnt64_t	free_blocks		= fsp->f_bfree;
1404 	fsblkcnt64_t	available_blocks	= fsp->f_bavail;
1405 	fsblkcnt64_t	used_blocks;
1406 	char 		*file_system		= DFR_SPECIAL(dfrp);
1407 	numbuf_t	total_blocks_buf;
1408 	numbuf_t	used_blocks_buf;
1409 	numbuf_t	available_blocks_buf;
1410 	char 		capacity_buf[LINEBUF_SIZE];
1411 
1412 	/*
1413 	 * If the free block count is -1, don't trust anything but the total
1414 	 * number of blocks.
1415 	 */
1416 	if (free_blocks == (fsblkcnt64_t)-1) {
1417 		used_blocks = (fsblkcnt64_t)-1;
1418 		(void) strcpy(capacity_buf, "  100%");
1419 	} else {
1420 		fsblkcnt64_t reserved_blocks = free_blocks - available_blocks;
1421 
1422 		used_blocks	= total_blocks - free_blocks;
1423 
1424 		/*
1425 		 * The capacity estimation is bogus when available_blocks is 0
1426 		 * and the super-user has allocated more space. The reason
1427 		 * is that reserved_blocks is inaccurate in that case, because
1428 		 * when the super-user allocates space, free_blocks is updated
1429 		 * but available_blocks is not (since it can't drop below 0).
1430 		 *
1431 		 * XCU4 and POSIX.2 require that any fractional result of the
1432 		 * capacity estimation be rounded to the next highest integer,
1433 		 * hence the addition of 0.5.
1434 		 */
1435 		(void) sprintf(capacity_buf, "%5.0f%%",
1436 			(total_blocks == 0) ? 0.0 :
1437 			((double)used_blocks /
1438 				(double)(total_blocks - reserved_blocks))
1439 					* 100.0 + 0.5);
1440 	}
1441 
1442 	/*
1443 	 * The available_blocks can be less than 0 on a 4.x file system.
1444 	 * Reset it to 0 in order to avoid printing negative numbers.
1445 	 */
1446 	if ((long long)available_blocks < (long long)0)
1447 		available_blocks = (fsblkcnt64_t)0;
1448 	/*
1449 	 * Print long special device names (usually NFS mounts) in a line
1450 	 * by themselves when the output is directed to a terminal.
1451 	 */
1452 	if (tty_output && strlen(file_system) > (size_t)FILESYSTEM_WIDTH) {
1453 		(void) printf("%s\n", file_system);
1454 		file_system = "";
1455 	}
1456 
1457 	adjust_total_blocks(dfrp, &total_blocks, fsp->f_frsize);
1458 
1459 	if (use_scaling) { /* comes from the -h option */
1460 	(void) printf("%-*s %*s %*s %*s %-*s %-s\n",
1461 		FILESYSTEM_WIDTH, file_system,
1462 		SCALED_WIDTH, number_to_scaled_string(total_blocks_buf,
1463 					total_blocks, fsp->f_frsize, scale),
1464 		SCALED_WIDTH, number_to_scaled_string(used_blocks_buf,
1465 					used_blocks, fsp->f_frsize, scale),
1466 		AVAILABLE_WIDTH, number_to_scaled_string(available_blocks_buf,
1467 					available_blocks, fsp->f_frsize, scale),
1468 		CAPACITY_WIDTH, capacity_buf,
1469 		DFR_MOUNT_POINT(dfrp));
1470 		return;
1471 	}
1472 
1473 	if (v_option) {
1474 	(void) printf("%-*.*s %-*.*s %*lld %*lld %*lld %-.*s\n",
1475 		IBCS2_MOUNT_POINT_WIDTH, IBCS2_MOUNT_POINT_WIDTH,
1476 		DFR_MOUNT_POINT(dfrp),
1477 		IBCS2_FILESYSTEM_WIDTH, IBCS2_FILESYSTEM_WIDTH, file_system,
1478 		BLOCK_WIDTH, total_blocks,
1479 		BLOCK_WIDTH, used_blocks,
1480 		BLOCK_WIDTH, available_blocks,
1481 		CAPACITY_WIDTH,	capacity_buf);
1482 		return;
1483 	}
1484 
1485 	if (P_option && !k_option) {
1486 	(void) printf("%-*s %*s %*s %*s %-*s %-s\n",
1487 		FILESYSTEM_WIDTH, file_system,
1488 		KBYTE_WIDTH, number_to_string(total_blocks_buf,
1489 					total_blocks, fsp->f_frsize, 512),
1490 		KBYTE_WIDTH, number_to_string(used_blocks_buf,
1491 					used_blocks, fsp->f_frsize, 512),
1492 		KBYTE_WIDTH, number_to_string(available_blocks_buf,
1493 					available_blocks, fsp->f_frsize, 512),
1494 		CAPACITY_WIDTH, capacity_buf,
1495 		DFR_MOUNT_POINT(dfrp));
1496 	} else {
1497 	(void) printf("%-*s %*s %*s %*s %-*s %-s\n",
1498 		FILESYSTEM_WIDTH, file_system,
1499 		KBYTE_WIDTH, number_to_string(total_blocks_buf,
1500 					total_blocks, fsp->f_frsize, 1024),
1501 		KBYTE_WIDTH, number_to_string(used_blocks_buf,
1502 					used_blocks, fsp->f_frsize, 1024),
1503 		KBYTE_WIDTH, number_to_string(available_blocks_buf,
1504 					available_blocks, fsp->f_frsize, 1024),
1505 		CAPACITY_WIDTH,	capacity_buf,
1506 		DFR_MOUNT_POINT(dfrp));
1507 	}
1508 }
1509 
1510 /*
1511  * The following is for internationalization support.
1512  */
1513 static bool_int strings_initialized;
1514 static char 	*files_str;
1515 static char	*blocks_str;
1516 static char	*total_str;
1517 static char	*kilobytes_str;
1518 
1519 static void
1520 strings_init()
1521 {
1522 	total_str = TRANSLATE("total");
1523 #ifdef	_iBCS2
1524 	/* ISC/SCO print i-nodes instead of files */
1525 	if (sysv3_set)
1526 		files_str = TRANSLATE("i-nodes");
1527 	else
1528 #endif	/* _iBCS2 */
1529 		files_str = TRANSLATE("files");
1530 	blocks_str = TRANSLATE("blocks");
1531 	kilobytes_str = TRANSLATE("kilobytes");
1532 	strings_initialized = TRUE;
1533 }
1534 
1535 #define	STRINGS_INIT()		if (!strings_initialized) strings_init()
1536 
1537 
1538 static void
1539 t_output(struct df_request *dfrp, struct statvfs64 *fsp)
1540 {
1541 	fsblkcnt64_t	total_blocks = fsp->f_blocks;
1542 	numbuf_t	total_blocks_buf;
1543 	numbuf_t	total_files_buf;
1544 	numbuf_t	free_blocks_buf;
1545 	numbuf_t	free_files_buf;
1546 
1547 	STRINGS_INIT();
1548 
1549 	adjust_total_blocks(dfrp, &total_blocks, fsp->f_frsize);
1550 
1551 	(void) printf("%-*s(%-*s): %*s %s %*s %s\n",
1552 		MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1553 		SPECIAL_DEVICE_WIDTH, DFR_SPECIAL(dfrp),
1554 		BLOCK_WIDTH, number_to_string(free_blocks_buf,
1555 			fsp->f_bfree, fsp->f_frsize, 512),
1556 			blocks_str,
1557 		NFILES_WIDTH, number_to_string(free_files_buf,
1558 			fsp->f_ffree, 1, 1),
1559 		files_str);
1560 	/*
1561 	 * The total column used to use the same space as the mnt pt & special
1562 	 * dev fields. However, this doesn't work with massive special dev
1563 	 * fields * (eg > 500 chars) causing an enormous amount of white space
1564 	 * before the total column (see bug 4100411). So the code was
1565 	 * simplified to set the total column at the usual gap.
1566 	 * This had the side effect of fixing a bug where the previously
1567 	 * used static buffer was overflowed by the same massive special dev.
1568 	 */
1569 	(void) printf("%*s: %*s %s %*s %s\n",
1570 		MNT_SPEC_WIDTH, total_str,
1571 		BLOCK_WIDTH, number_to_string(total_blocks_buf,
1572 				total_blocks, fsp->f_frsize, 512),
1573 		blocks_str,
1574 		NFILES_WIDTH, number_to_string(total_files_buf,
1575 				fsp->f_files, 1, 1),
1576 		files_str);
1577 }
1578 
1579 
1580 static void
1581 eb_output(struct df_request *dfrp, struct statvfs64 *fsp)
1582 {
1583 	numbuf_t free_files_buf;
1584 	numbuf_t free_kbytes_buf;
1585 
1586 	STRINGS_INIT();
1587 
1588 	(void) printf("%-*s(%-*s): %*s %s\n",
1589 		MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1590 		SPECIAL_DEVICE_WIDTH, DFR_SPECIAL(dfrp),
1591 		MAX(KBYTE_WIDTH, NFILES_WIDTH),
1592 			number_to_string(free_kbytes_buf,
1593 			fsp->f_bfree, fsp->f_frsize, 1024),
1594 		kilobytes_str);
1595 	(void) printf("%-*s(%-*s): %*s %s\n",
1596 		MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1597 		SPECIAL_DEVICE_WIDTH, DFR_SPECIAL(dfrp),
1598 		MAX(NFILES_WIDTH, NFILES_WIDTH),
1599 			number_to_string(free_files_buf, fsp->f_ffree, 1, 1),
1600 		files_str);
1601 }
1602 
1603 
1604 static void
1605 e_output(struct df_request *dfrp, struct statvfs64 *fsp)
1606 {
1607 	numbuf_t free_files_buf;
1608 
1609 	(void) printf("%-*s %*s\n",
1610 		FILESYSTEM_WIDTH, DFR_SPECIAL(dfrp),
1611 		NFILES_WIDTH,
1612 			number_to_string(free_files_buf, fsp->f_ffree, 1, 1));
1613 }
1614 
1615 
1616 static void
1617 b_output(struct df_request *dfrp, struct statvfs64 *fsp)
1618 {
1619 	numbuf_t free_blocks_buf;
1620 
1621 	(void) printf("%-*s %*s\n",
1622 		FILESYSTEM_WIDTH, DFR_SPECIAL(dfrp),
1623 		BLOCK_WIDTH, number_to_string(free_blocks_buf,
1624 				fsp->f_bfree, fsp->f_frsize, 1024));
1625 }
1626 
1627 
1628 /* ARGSUSED */
1629 static void
1630 n_output(struct df_request *dfrp, struct statvfs64 *fsp)
1631 {
1632 	(void) printf("%-*s: %-*s\n",
1633 		MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1634 		FSTYPE_WIDTH, dfrp->dfr_fstype);
1635 }
1636 
1637 
1638 static void
1639 default_output(struct df_request *dfrp, struct statvfs64 *fsp)
1640 {
1641 	numbuf_t free_blocks_buf;
1642 	numbuf_t free_files_buf;
1643 
1644 	STRINGS_INIT();
1645 
1646 	(void) printf("%-*s(%-*s):%*s %s %*s %s\n",
1647 		MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1648 		SPECIAL_DEVICE_WIDTH, DFR_SPECIAL(dfrp),
1649 		BLOCK_WIDTH, number_to_string(free_blocks_buf,
1650 			fsp->f_bfree, fsp->f_frsize, 512),
1651 		blocks_str,
1652 		NFILES_WIDTH, number_to_string(free_files_buf,
1653 			fsp->f_ffree, 1, 1),
1654 		files_str);
1655 }
1656 
1657 
1658 /* ARGSUSED */
1659 static void
1660 V_output(struct df_request *dfrp, struct statvfs64 *fsp)
1661 {
1662 	char temp_buf[LINEBUF_SIZE];
1663 
1664 	if (df_options_len > 1)
1665 		(void) strcat(strcpy(temp_buf, df_options), " ");
1666 	else
1667 		temp_buf[0] = NUL;
1668 
1669 	(void) printf("%s -F %s %s%s\n",
1670 		program_name, dfrp->dfr_fstype, temp_buf,
1671 		dfrp->dfr_cmd_arg ? dfrp->dfr_cmd_arg: DFR_SPECIAL(dfrp));
1672 }
1673 
1674 
1675 /*
1676  * This function is used to sort the array of df_requests according to fstype
1677  */
1678 static int
1679 df_reqcomp(const void *p1, const void *p2)
1680 {
1681 	int v = strcmp(DFRP(p1)->dfr_fstype, DFRP(p2)->dfr_fstype);
1682 
1683 	if (v != 0)
1684 		return (v);
1685 	else
1686 		return (DFRP(p1)->dfr_index - DFRP(p2)->dfr_index);
1687 }
1688 
1689 
1690 static void
1691 vfs_error(char *file, int status)
1692 {
1693 	if (status == VFS_TOOLONG)
1694 		errmsg(ERR_NOFLAGS, "a line in %s exceeds %d characters",
1695 			file, MNT_LINE_MAX);
1696 	else if (status == VFS_TOOMANY)
1697 		errmsg(ERR_NOFLAGS, "a line in %s has too many fields", file);
1698 	else if (status == VFS_TOOFEW)
1699 		errmsg(ERR_NOFLAGS, "a line in %s has too few fields", file);
1700 	else
1701 		errmsg(ERR_NOFLAGS, "error while reading %s: %d", file, status);
1702 }
1703 
1704 
1705 /*
1706  * Try to determine the fstype for the specified block device.
1707  * Return in order of decreasing preference:
1708  *	file system type from vfstab
1709  *	file system type as specified by -F option
1710  *	default file system type
1711  */
1712 static char *
1713 find_fstype(char *special)
1714 {
1715 	struct vfstab	vtab;
1716 	FILE		*fp;
1717 	int		status;
1718 	char		*vfstab_file = VFS_TAB;
1719 
1720 	fp = xfopen(vfstab_file);
1721 	status = getvfsspec(fp, &vtab, special);
1722 	(void) fclose(fp);
1723 	if (status > 0)
1724 		vfs_error(vfstab_file, status);
1725 
1726 	if (status == 0) {
1727 		if (F_option && ! EQ(FSType, vtab.vfs_fstype))
1728 			errmsg(ERR_NOFLAGS,
1729 			"warning: %s is of type %s", special, vtab.vfs_fstype);
1730 		return (new_string(vtab.vfs_fstype));
1731 	}
1732 	else
1733 		return (F_option ? FSType : default_fstype(special));
1734 }
1735 
1736 /*
1737  * When this function returns, the following fields are filled for all
1738  * valid entries in the requests[] array:
1739  *		dfr_mte		(if the file system is mounted)
1740  *		dfr_fstype
1741  *		dfr_index
1742  *
1743  * The function returns the number of errors that occurred while building
1744  * the request list.
1745  */
1746 static int
1747 create_request_list(
1748 			int argc,
1749 			char *argv[],
1750 			struct df_request *requests_p[],
1751 			size_t *request_count)
1752 {
1753 	struct df_request	*requests;
1754 	struct df_request	*dfrp;
1755 	size_t			size;
1756 	size_t 			i;
1757 	size_t 			request_index = 0;
1758 	size_t			max_requests;
1759 	int			errors = 0;
1760 
1761 	/*
1762 	 * If no args, use the mounted file systems, otherwise use the
1763 	 * user-specified arguments.
1764 	 */
1765 	if (argc == 0) {
1766 		mtab_read_file();
1767 		max_requests = mount_table_entries;
1768 	} else
1769 		max_requests = argc;
1770 
1771 	size = max_requests * sizeof (struct df_request);
1772 	requests = xmalloc(size);
1773 	(void) memset(requests, 0, size);
1774 
1775 	if (argc == 0) {
1776 		/*
1777 		 * If -Z wasn't specified, we skip mounts in other
1778 		 * zones.  This obviously is a noop in a non-global
1779 		 * zone.
1780 		 */
1781 		boolean_t showall = (getzoneid() != GLOBAL_ZONEID) || Z_option;
1782 		struct zone_summary *zsp;
1783 
1784 		if (!showall) {
1785 			zsp = fs_get_zone_summaries();
1786 			if (zsp == NULL)
1787 				errmsg(ERR_FATAL,
1788 				    "unable to retrieve list of zones");
1789 		}
1790 
1791 		for (i = 0; i < mount_table_entries; i++) {
1792 			struct extmnttab *mtp = mount_table[i].mte_mount;
1793 
1794 			if (EQ(mtp->mnt_fstype, MNTTYPE_SWAP))
1795 				continue;
1796 
1797 			if (!showall) {
1798 				if (fs_mount_in_other_zone(zsp,
1799 				    mtp->mnt_mountp))
1800 					continue;
1801 			}
1802 			dfrp = &requests[request_index++];
1803 			dfrp->dfr_mte		= &mount_table[i];
1804 			dfrp->dfr_fstype	= mtp->mnt_fstype;
1805 			dfrp->dfr_index		= i;
1806 			dfrp->dfr_valid		= TRUE;
1807 		}
1808 	} else {
1809 		struct stat64 *arg_stat; /* array of stat structures	*/
1810 		bool_int *valid_stat;	/* which structures are valid	*/
1811 
1812 		arg_stat = xmalloc(argc * sizeof (struct stat64));
1813 		valid_stat = xmalloc(argc * sizeof (bool_int));
1814 
1815 		/*
1816 		 * Obtain stat64 information for each argument before
1817 		 * constructing the list of mounted file systems. By
1818 		 * touching all these places we force the automounter
1819 		 * to establish any mounts required to access the arguments,
1820 		 * so that the corresponding mount table entries will exist
1821 		 * when we look for them.
1822 		 * It is still possible that the automounter may timeout
1823 		 * mounts between the time we read the mount table and the
1824 		 * time we process the request. Even in that case, when
1825 		 * we issue the statvfs64(2) for the mount point, the file
1826 		 * system will be mounted again. The only problem will
1827 		 * occur if the automounter maps change in the meantime
1828 		 * and the mount point is eliminated.
1829 		 */
1830 		for (i = 0; i < argc; i++)
1831 			valid_stat[i] = (stat64(argv[i], &arg_stat[i]) == 0);
1832 
1833 		mtab_read_file();
1834 
1835 		for (i = 0; i < argc; i++) {
1836 			char *arg = argv[i];
1837 
1838 			dfrp = &requests[request_index];
1839 
1840 			dfrp->dfr_index = request_index;
1841 			dfrp->dfr_cmd_arg = arg;
1842 
1843 			if (valid_stat[i]) {
1844 				if (S_ISBLK(arg_stat[i].st_mode)) {
1845 					bdev_mount_entry(dfrp);
1846 					dfrp->dfr_valid = TRUE;
1847 				} else if (S_ISDIR(arg_stat[i].st_mode) ||
1848 					S_ISREG(arg_stat[i].st_mode) ||
1849 					S_ISFIFO(arg_stat[i].st_mode)) {
1850 					path_mount_entry(dfrp,
1851 						arg_stat[i].st_dev);
1852 					if (! DFR_ISMOUNTEDFS(dfrp)) {
1853 						errors++;
1854 						continue;
1855 					}
1856 					dfrp->dfr_valid = TRUE;
1857 				}
1858 			} else {
1859 				resource_mount_entry(dfrp);
1860 				dfrp->dfr_valid = DFR_ISMOUNTEDFS(dfrp);
1861 			}
1862 
1863 			/*
1864 			 * If we haven't managed to verify that the request
1865 			 * is valid, we must have gotten a bad argument.
1866 			 */
1867 			if (!dfrp->dfr_valid) {
1868 				errmsg(ERR_NOFLAGS,
1869 		"(%-10s) not a block device, directory or mounted resource",
1870 					arg);
1871 				errors++;
1872 				continue;
1873 			}
1874 
1875 			/*
1876 			 * Determine the file system type.
1877 			 */
1878 			if (DFR_ISMOUNTEDFS(dfrp))
1879 				dfrp->dfr_fstype =
1880 					dfrp->dfr_mte->mte_mount->mnt_fstype;
1881 			else
1882 				dfrp->dfr_fstype =
1883 					find_fstype(dfrp->dfr_cmd_arg);
1884 
1885 			request_index++;
1886 		}
1887 	}
1888 	*requests_p = requests;
1889 	*request_count = request_index;
1890 	return (errors);
1891 }
1892 
1893 
1894 /*
1895  * Select the appropriate function and flags to use for output.
1896  * Notice that using both -e and -b options produces a different form of
1897  * output than either of those two options alone; this is the behavior of
1898  * the SVR4 df.
1899  */
1900 static struct df_output *
1901 select_output()
1902 {
1903 	static struct df_output dfo;
1904 
1905 	/*
1906 	 * The order of checking options follows the option precedence
1907 	 * rules as they are listed in the man page.
1908 	 */
1909 	if (use_scaling) { /* comes from the -h option */
1910 		dfo.dfo_func = k_output;
1911 		dfo.dfo_flags = DFO_HEADER + DFO_STATVFS;
1912 	} else if (V_option) {
1913 		dfo.dfo_func = V_output;
1914 		dfo.dfo_flags = DFO_NOFLAGS;
1915 	} else if (g_option) {
1916 		dfo.dfo_func = g_output;
1917 		dfo.dfo_flags = DFO_STATVFS;
1918 	} else if (k_option || P_option || v_option) {
1919 		dfo.dfo_func = k_output;
1920 		dfo.dfo_flags = DFO_HEADER + DFO_STATVFS;
1921 	} else if (t_option) {
1922 		dfo.dfo_func = t_output;
1923 		dfo.dfo_flags = DFO_STATVFS;
1924 	} else if (b_option && e_option) {
1925 		dfo.dfo_func = eb_output;
1926 		dfo.dfo_flags = DFO_STATVFS;
1927 	} else if (b_option) {
1928 		dfo.dfo_func = b_output;
1929 		dfo.dfo_flags = DFO_HEADER + DFO_STATVFS;
1930 	} else if (e_option) {
1931 		dfo.dfo_func = e_output;
1932 		dfo.dfo_flags = DFO_HEADER + DFO_STATVFS;
1933 	} else if (n_option) {
1934 		dfo.dfo_func = n_output;
1935 		dfo.dfo_flags = DFO_NOFLAGS;
1936 	} else {
1937 		dfo.dfo_func = default_output;
1938 		dfo.dfo_flags = DFO_STATVFS;
1939 	}
1940 	return (&dfo);
1941 }
1942 
1943 
1944 /*
1945  * The (argc,argv) pair contains all the non-option arguments
1946  */
1947 static void
1948 do_df(int argc, char *argv[])
1949 {
1950 	size_t			i;
1951 	struct df_request	*requests;		/* array of requests */
1952 	size_t			n_requests;
1953 	struct df_request	*dfrp;
1954 	int			errors;
1955 
1956 	errors = create_request_list(argc, argv, &requests, &n_requests);
1957 
1958 	if (n_requests == 0)
1959 		exit(errors);
1960 
1961 	/*
1962 	 * If we are going to run the FSType-specific df command,
1963 	 * rearrange the requests so that we can issue a single command
1964 	 * per file system type.
1965 	 */
1966 	if (o_option) {
1967 		size_t j;
1968 
1969 		/*
1970 		 * qsort is not a stable sorting method (i.e. requests of
1971 		 * the same file system type may be swapped, and hence appear
1972 		 * in the output in a different order from the one in which
1973 		 * they were listed in the command line). In order to force
1974 		 * stability, we use the dfr_index field which is unique
1975 		 * for each request.
1976 		 */
1977 		qsort(requests,
1978 			n_requests, sizeof (struct df_request), df_reqcomp);
1979 		for (i = 0; i < n_requests; i = j) {
1980 			char *fstype = requests[i].dfr_fstype;
1981 
1982 			for (j = i+1; j < n_requests; j++)
1983 				if (! EQ(fstype, requests[j].dfr_fstype))
1984 					break;
1985 
1986 			/*
1987 			 * At this point, requests in the range [i,j) are
1988 			 * of the same type.
1989 			 *
1990 			 * If the -F option was used, and the user specified
1991 			 * arguments, the filesystem types must match
1992 			 *
1993 			 * XXX: the alternative of doing this check here is to
1994 			 * 	invoke prune_list, but then we have to
1995 			 *	modify this code to ignore invalid requests.
1996 			 */
1997 			if (F_option && ! EQ(fstype, FSType)) {
1998 				size_t k;
1999 
2000 				for (k = i; k < j; k++) {
2001 					dfrp = &requests[k];
2002 					if (dfrp->dfr_cmd_arg != NULL) {
2003 						errmsg(ERR_NOFLAGS,
2004 				"Warning: %s mounted as a %s file system",
2005 					dfrp->dfr_cmd_arg, dfrp->dfr_fstype);
2006 						errors++;
2007 					}
2008 				}
2009 			} else
2010 				errors += run_fs_specific_df(&requests[i], j-i);
2011 		}
2012 	} else {
2013 		size_t valid_requests;
2014 
2015 		/*
2016 		 * We have to prune the request list to avoid printing a header
2017 		 * if there are no valid requests
2018 		 */
2019 		errors += prune_list(requests, n_requests, &valid_requests);
2020 
2021 		if (valid_requests) {
2022 			struct df_output *dfop = select_output();
2023 
2024 			/* indicates if we already printed out a header line */
2025 			int printed_header = 0;
2026 
2027 			for (i = 0; i < n_requests; i++) {
2028 				dfrp = &requests[i];
2029 				if (! dfrp->dfr_valid)
2030 					continue;
2031 
2032 				/*
2033 				 * If we don't have a mount point,
2034 				 * this must be a block device.
2035 				 */
2036 				if (DFR_ISMOUNTEDFS(dfrp)) {
2037 					struct statvfs64 stvfs;
2038 
2039 					if ((dfop->dfo_flags & DFO_STATVFS) &&
2040 						statvfs64(DFR_MOUNT_POINT(dfrp),
2041 							&stvfs) == -1) {
2042 						errmsg(ERR_PERROR,
2043 							"cannot statvfs %s:",
2044 							DFR_MOUNT_POINT(dfrp));
2045 						errors++;
2046 						continue;
2047 					}
2048 					if ((!printed_header) &&
2049 					    (dfop->dfo_flags & DFO_HEADER)) {
2050 						print_header();
2051 						printed_header = 1;
2052 					}
2053 
2054 					(*dfop->dfo_func)(dfrp, &stvfs);
2055 				} else {
2056 					/*
2057 					 *  -h option only works for
2058 					 *  mounted filesystems
2059 					 */
2060 					if (use_scaling) {
2061 						errmsg(ERR_NOFLAGS,
2062 		"-h option incompatible with unmounted special device (%s)",
2063 						    dfrp->dfr_cmd_arg);
2064 						errors++;
2065 						continue;
2066 					}
2067 					errors += run_fs_specific_df(dfrp, 1);
2068 				}
2069 			}
2070 		}
2071 	}
2072 	exit(errors);
2073 }
2074 
2075 
2076 /*
2077  * The rest of this file implements the devnm command
2078  */
2079 
2080 static char *
2081 find_dev_name(char *file, dev_t dev)
2082 {
2083 	struct df_request dfreq;
2084 
2085 	dfreq.dfr_cmd_arg = file;
2086 	dfreq.dfr_fstype = 0;
2087 	dfreq.dfr_mte = NULL;
2088 	path_mount_entry(&dfreq, dev);
2089 	return (DFR_ISMOUNTEDFS(&dfreq) ? DFR_SPECIAL(&dfreq) : NULL);
2090 }
2091 
2092 
2093 static void
2094 do_devnm(int argc, char *argv[])
2095 {
2096 	int arg;
2097 	int errors = 0;
2098 	char *dev_name;
2099 
2100 	if (argc == 1)
2101 		errmsg(ERR_NONAME, "Usage: %s name ...", DEVNM_CMD);
2102 
2103 	mtab_read_file();
2104 
2105 	for (arg = 1; arg < argc; arg++) {
2106 		char *file = argv[arg];
2107 		struct stat64 st;
2108 
2109 		if (stat64(file, &st) == -1) {
2110 			errmsg(ERR_PERROR, "%s: ", file);
2111 			errors++;
2112 			continue;
2113 		}
2114 
2115 		if (! is_remote_fs(st.st_fstype) &&
2116 			! EQ(st.st_fstype, MNTTYPE_TMPFS) &&
2117 				(dev_name = find_dev_name(file, st.st_dev)))
2118 			(void) printf("%s %s\n", dev_name, file);
2119 		else
2120 			errmsg(ERR_NOFLAGS,
2121 				"%s not found", file);
2122 	}
2123 	exit(errors);
2124 	/* NOTREACHED */
2125 }
2126