xref: /titanic_50/usr/src/cmd/fs.d/df.c (revision 2020b2b6df0384feda1732f65486c4604fbf5bea)
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 (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
22 /*	  All Rights Reserved  	*/
23 
24 
25 /*
26  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
27  */
28 
29 
30 #include <dlfcn.h>
31 #include <stdio.h>
32 #include <stdarg.h>
33 #include <string.h>
34 #include <locale.h>
35 #include <libintl.h>
36 #include <stdlib.h>
37 #include <ftw.h>
38 #include <errno.h>
39 #include <sys/types.h>
40 #include <unistd.h>
41 #include <sys/statvfs.h>
42 #include <sys/stat.h>
43 #include <sys/param.h>
44 #include <sys/mnttab.h>
45 #include <sys/mntent.h>
46 #include <sys/vfstab.h>
47 #include <sys/wait.h>
48 #include <sys/mkdev.h>
49 #include <sys/int_limits.h>
50 #include <sys/zone.h>
51 #include <libzfs.h>
52 
53 #include "fslib.h"
54 
55 extern char *default_fstype(char *);
56 
57 /*
58  * General notice:
59  * String pointers in this code may point to statically allocated memory
60  * or dynamically allocated memory. Furthermore, a dynamically allocated
61  * string may be pointed to by more than one pointer. This does not pose
62  * a problem because malloc'ed memory is never free'd (so we don't need
63  * to remember which pointers point to malloc'ed memory).
64  */
65 
66 /*
67  * TRANSLATION_NOTE
68  * Only strings passed as arguments to the TRANSLATE macro need to
69  * be translated.
70  */
71 
72 #ifndef MNTTYPE_LOFS
73 #define	MNTTYPE_LOFS		"lofs"
74 #endif
75 
76 #define	EQ(s1, s2)		(strcmp(s1, s2) == 0)
77 #define	NEW(type)		xmalloc(sizeof (type))
78 #define	CLEAR(var)		(void) memset(&(var), 0, sizeof (var))
79 #define	MAX(a, b)		((a) > (b) ? (a) : (b))
80 #define	MAX3(a, b, c)		MAX(a, MAX(b, c))
81 #define	TRANSLATE(s)		new_string(gettext(s))
82 
83 #define	MAX_OPTIONS		36
84 #define	N_FSTYPES		20
85 #define	MOUNT_TABLE_ENTRIES	40	/* initial allocation */
86 #define	MSGBUF_SIZE		1024
87 #define	LINEBUF_SIZE		256	/* either input or output lines */
88 
89 #define	BLOCK_SIZE		512	/* when reporting in terms of blocks */
90 
91 #define	DEVNM_CMD		"devnm"
92 #define	FS_LIBPATH		"/usr/lib/fs/"
93 #define	MOUNT_TAB		"/etc/mnttab"
94 #define	VFS_TAB			"/etc/vfstab"
95 #define	REMOTE_FS		"/etc/dfs/fstypes"
96 
97 #define	NUL			'\0'
98 #define	FALSE			0
99 #define	TRUE			1
100 
101 /*
102  * Formatting constants
103  */
104 #define	IBCS2_FILESYSTEM_WIDTH	15	/* Truncate to match ISC/SCO */
105 #define	IBCS2_MOUNT_POINT_WIDTH	10	/* Truncate to match ISC/SCO */
106 #define	FILESYSTEM_WIDTH	20
107 #define	MOUNT_POINT_WIDTH	19
108 #define	SPECIAL_DEVICE_WIDTH	18
109 #define	FSTYPE_WIDTH		8
110 #define	BLOCK_WIDTH		8
111 #define	NFILES_WIDTH		8
112 #ifdef XPG4
113 #define	KBYTE_WIDTH		11
114 #define	AVAILABLE_WIDTH		10
115 #else
116 #define	KBYTE_WIDTH		7
117 #define	AVAILABLE_WIDTH		6
118 #endif
119 #define	SCALED_WIDTH		6
120 #define	CAPACITY_WIDTH		9
121 #define	BSIZE_WIDTH		6
122 #define	FRAGSIZE_WIDTH		7
123 #define	FSID_WIDTH		7
124 #define	FLAG_WIDTH		8
125 #define	NAMELEN_WIDTH		7
126 #define	MNT_SPEC_WIDTH		MOUNT_POINT_WIDTH + SPECIAL_DEVICE_WIDTH + 2
127 
128 /*
129  * Flags for the errmsg() function
130  */
131 #define	ERR_NOFLAGS		0x0
132 #define	ERR_NONAME		0x1	/* don't include the program name */
133 					/* as a prefix */
134 #define	ERR_FATAL		0x2	/* call exit after printing the */
135 					/* message */
136 #define	ERR_PERROR		0x4	/* append an errno explanation to */
137 					/* the message */
138 #define	ERR_USAGE		0x8	/* print the usage line after the */
139 					/* message */
140 
141 #define	NUMBER_WIDTH		40
142 
143 /*
144  * A numbuf_t is used when converting a number to a string representation
145  */
146 typedef char numbuf_t[ NUMBER_WIDTH ];
147 
148 /*
149  * We use bool_int instead of int to make clear which variables are
150  * supposed to be boolean
151  */
152 typedef int bool_int;
153 
154 struct mtab_entry {
155 	bool_int	mte_dev_is_valid;
156 	dev_t		mte_dev;
157 	bool_int	mte_ignore;	/* the "ignore" option was set */
158 	struct extmnttab	*mte_mount;
159 };
160 
161 
162 struct df_request {
163 	bool_int		dfr_valid;
164 	char			*dfr_cmd_arg;	/* what the user specified */
165 	struct mtab_entry	*dfr_mte;
166 	char			*dfr_fstype;
167 	int			dfr_index;	/* to make qsort stable	*/
168 };
169 
170 #define	DFR_MOUNT_POINT(dfrp)	(dfrp)->dfr_mte->mte_mount->mnt_mountp
171 #define	DFR_SPECIAL(dfrp)	(dfrp)->dfr_mte->mte_mount->mnt_special
172 #define	DFR_FSTYPE(dfrp)	(dfrp)->dfr_mte->mte_mount->mnt_fstype
173 #define	DFR_ISMOUNTEDFS(dfrp)	((dfrp)->dfr_mte != NULL)
174 
175 #define	DFRP(p)			((struct df_request *)(p))
176 
177 typedef void (*output_func)(struct df_request *, struct statvfs64 *);
178 
179 struct df_output {
180 	output_func	dfo_func;	/* function that will do the output */
181 	int		dfo_flags;
182 };
183 
184 /*
185  * Output flags
186  */
187 #define	DFO_NOFLAGS	0x0
188 #define	DFO_HEADER	0x1		/* output preceded by header */
189 #define	DFO_STATVFS	0x2		/* must do a statvfs64(2) */
190 
191 
192 static char	*program_name;
193 static char	df_options[MAX_OPTIONS] = "-";
194 static size_t	df_options_len = 1;
195 static char	*o_option_arg;			/* arg to the -o option */
196 static char	*FSType;
197 static char	*remote_fstypes[N_FSTYPES+1];	/* allocate an extra one */
198 						/* to use as a terminator */
199 
200 /*
201  * The following three variables support an in-memory copy of the mount table
202  * to speedup searches.
203  */
204 static struct mtab_entry	*mount_table;	/* array of mtab_entry's */
205 static size_t			mount_table_entries;
206 static size_t			mount_table_allocated_entries;
207 
208 static bool_int		F_option;
209 static bool_int		V_option;
210 static bool_int		P_option;	/* Added for XCU4 compliance */
211 static bool_int		Z_option;
212 static bool_int		v_option;
213 static bool_int		a_option;
214 static bool_int		b_option;
215 static bool_int		e_option;
216 static bool_int		g_option;
217 static bool_int		h_option;
218 static bool_int		k_option;
219 static bool_int		l_option;
220 static bool_int		n_option;
221 static bool_int		t_option;
222 static bool_int		o_option;
223 
224 static bool_int		tty_output;
225 static bool_int		use_scaling;
226 static int		scale;
227 
228 static void usage(void);
229 static void do_devnm(int, char **);
230 static void do_df(int, char **)	__NORETURN;
231 static void parse_options(int, char **);
232 static char *basename(char *);
233 
234 static libzfs_handle_t *(*_libzfs_init)(void);
235 static zfs_handle_t *(*_zfs_open)(libzfs_handle_t *, const char *, int);
236 static void (*_zfs_close)(zfs_handle_t *);
237 static uint64_t (*_zfs_prop_get_int)(zfs_handle_t *, zfs_prop_t);
238 static libzfs_handle_t *g_zfs;
239 
240 /*
241  * Dynamically check for libzfs, in case the user hasn't installed the SUNWzfs
242  * packages.  A basic utility such as df shouldn't depend on optional
243  * filesystems.
244  */
245 static boolean_t
246 load_libzfs(void)
247 {
248 	void *hdl;
249 
250 	if (_libzfs_init != NULL)
251 		return (g_zfs != NULL);
252 
253 	if ((hdl = dlopen("libzfs.so", RTLD_LAZY)) != NULL) {
254 		_libzfs_init = (libzfs_handle_t *(*)(void))dlsym(hdl,
255 		    "libzfs_init");
256 		_zfs_open = (zfs_handle_t *(*)())dlsym(hdl, "zfs_open");
257 		_zfs_close = (void (*)())dlsym(hdl, "zfs_close");
258 		_zfs_prop_get_int = (uint64_t (*)())
259 		    dlsym(hdl, "zfs_prop_get_int");
260 
261 		if (_libzfs_init != NULL) {
262 			assert(_zfs_open != NULL);
263 			assert(_zfs_close != NULL);
264 			assert(_zfs_prop_get_int != NULL);
265 
266 			g_zfs = _libzfs_init();
267 		}
268 	}
269 
270 	return (g_zfs != NULL);
271 }
272 
273 int
274 main(int argc, char *argv[])
275 {
276 	(void) setlocale(LC_ALL, "");
277 
278 #if !defined(TEXT_DOMAIN)		/* Should be defined by cc -D */
279 #define	TEXT_DOMAIN "SYS_TEST"
280 #endif
281 	(void) textdomain(TEXT_DOMAIN);
282 
283 	program_name = basename(argv[0]);
284 
285 	if (EQ(program_name, DEVNM_CMD))
286 		do_devnm(argc, argv);
287 
288 	parse_options(argc, argv);
289 
290 	/*
291 	 * The k_option implies SunOS 4.x compatibility: when the special
292 	 * device name is too long the line will be split except when the
293 	 * output has been redirected.
294 	 * This is also valid for the -h option.
295 	 */
296 
297 	if (use_scaling || k_option || P_option || v_option)
298 		tty_output = isatty(1);
299 
300 	do_df(argc - optind, &argv[optind]);
301 	/* NOTREACHED */
302 }
303 
304 
305 /*
306  * Prints an error message to stderr.
307  */
308 /* VARARGS2 */
309 static void
310 errmsg(int flags, char *fmt, ...)
311 {
312 	char buf[MSGBUF_SIZE];
313 	va_list ap;
314 	int cc;
315 	int offset;
316 
317 	if (flags & ERR_NONAME)
318 		offset = 0;
319 	else
320 		offset = sprintf(buf, "%s: ", program_name);
321 
322 	va_start(ap, fmt);
323 	cc = vsprintf(&buf[offset], gettext(fmt), ap);
324 	offset += cc;
325 	va_end(ap);
326 
327 	if (flags & ERR_PERROR) {
328 		if (buf[offset-1] != ' ')
329 			(void) strcat(buf, " ");
330 		(void) strcat(buf, strerror(errno));
331 	}
332 	(void) fprintf(stderr, "%s\n", buf);
333 	if (flags & ERR_USAGE)
334 		usage();
335 	if (flags & ERR_FATAL)
336 		exit(1);
337 }
338 
339 
340 static void
341 usage(void)
342 {
343 #ifdef  XPG4
344 	errmsg(ERR_NONAME,
345 	    "Usage: %s [-F FSType] [-abeghklntPVZ] [-o FSType-specific_options]"
346 	    " [directory | block_device | resource]", program_name);
347 #else
348 	errmsg(ERR_NONAME,
349 	    "Usage: %s [-F FSType] [-abeghklntVvZ] [-o FSType-specific_options]"
350 	    " [directory | block_device | resource]", program_name);
351 #endif
352 	exit(1);
353 	/* NOTREACHED */
354 }
355 
356 
357 static char *
358 new_string(char *s)
359 {
360 	char *p = NULL;
361 
362 	if (s) {
363 		p = strdup(s);
364 		if (p)
365 			return (p);
366 		errmsg(ERR_FATAL, "out of memory");
367 		/* NOTREACHED */
368 	}
369 	return (p);
370 }
371 
372 
373 /*
374  * Allocate memory using malloc but terminate if the allocation fails
375  */
376 static void *
377 xmalloc(size_t size)
378 {
379 	void *p = malloc(size);
380 
381 	if (p)
382 		return (p);
383 	errmsg(ERR_FATAL, "out of memory");
384 	/* NOTREACHED */
385 	return (NULL);
386 }
387 
388 
389 /*
390  * Allocate memory using realloc but terminate if the allocation fails
391  */
392 static void *
393 xrealloc(void *ptr, size_t size)
394 {
395 	void *p = realloc(ptr, size);
396 
397 	if (p)
398 		return (p);
399 	errmsg(ERR_FATAL, "out of memory");
400 	/* NOTREACHED */
401 	return (NULL);
402 }
403 
404 
405 /*
406  * fopen the specified file for reading but terminate if the fopen fails
407  */
408 static FILE *
409 xfopen(char *file)
410 {
411 	FILE *fp = fopen(file, "r");
412 
413 	if (fp == NULL)
414 		errmsg(ERR_FATAL + ERR_PERROR, "failed to open %s:", file);
415 	return (fp);
416 }
417 
418 
419 /*
420  * Read remote file system types from REMOTE_FS into the
421  * remote_fstypes array.
422  */
423 static void
424 init_remote_fs(void)
425 {
426 	FILE	*fp;
427 	char	line_buf[LINEBUF_SIZE];
428 	size_t	fstype_index = 0;
429 
430 	if ((fp = fopen(REMOTE_FS, "r")) == NULL) {
431 		errmsg(ERR_NOFLAGS,
432 		    "Warning: can't open %s, ignored", REMOTE_FS);
433 		return;
434 	}
435 
436 	while (fgets(line_buf, sizeof (line_buf), fp) != NULL) {
437 		char buf[LINEBUF_SIZE];
438 
439 		(void) sscanf(line_buf, "%s", buf);
440 		remote_fstypes[fstype_index++] = new_string(buf);
441 
442 		if (fstype_index == N_FSTYPES)
443 			break;
444 	}
445 	(void) fclose(fp);
446 }
447 
448 
449 /*
450  * Returns TRUE if fstype is a remote file system type;
451  * otherwise, returns FALSE.
452  */
453 static int
454 is_remote_fs(char *fstype)
455 {
456 	char **p;
457 	static bool_int remote_fs_initialized;
458 
459 	if (! remote_fs_initialized) {
460 		init_remote_fs();
461 		remote_fs_initialized = TRUE;
462 	}
463 
464 	for (p = remote_fstypes; *p; p++)
465 		if (EQ(fstype, *p))
466 			return (TRUE);
467 	return (FALSE);
468 }
469 
470 
471 static char *
472 basename(char *s)
473 {
474 	char *p = strrchr(s, '/');
475 
476 	return (p ? p+1 : s);
477 }
478 
479 
480 /*
481  * Create a new "struct extmnttab" and make sure that its fields point
482  * to malloc'ed memory
483  */
484 static struct extmnttab *
485 mntdup(struct extmnttab *old)
486 {
487 	struct extmnttab *new = NEW(struct extmnttab);
488 
489 	new->mnt_special = new_string(old->mnt_special);
490 	new->mnt_mountp  = new_string(old->mnt_mountp);
491 	new->mnt_fstype  = new_string(old->mnt_fstype);
492 	new->mnt_mntopts = new_string(old->mnt_mntopts);
493 	new->mnt_time    = new_string(old->mnt_time);
494 	new->mnt_major   = old->mnt_major;
495 	new->mnt_minor   = old->mnt_minor;
496 	return (new);
497 }
498 
499 
500 static void
501 mtab_error(char *mtab_file, int status)
502 {
503 	if (status == MNT_TOOLONG)
504 		errmsg(ERR_NOFLAGS, "a line in %s exceeds %d characters",
505 		    mtab_file, MNT_LINE_MAX);
506 	else if (status == MNT_TOOMANY)
507 		errmsg(ERR_NOFLAGS,
508 		    "a line in %s has too many fields", mtab_file);
509 	else if (status == MNT_TOOFEW)
510 		errmsg(ERR_NOFLAGS,
511 		    "a line in %s has too few fields", mtab_file);
512 	else
513 		errmsg(ERR_NOFLAGS,
514 		    "error while reading %s: %d", mtab_file, status);
515 	exit(1);
516 	/* NOTREACHED */
517 }
518 
519 
520 /*
521  * Read the mount table from the specified file.
522  * We keep the table in memory for faster lookups.
523  */
524 static void
525 mtab_read_file(void)
526 {
527 	char		*mtab_file = MOUNT_TAB;
528 	FILE		*fp;
529 	struct extmnttab	mtab;
530 	int		status;
531 
532 	fp = xfopen(mtab_file);
533 
534 	resetmnttab(fp);
535 	mount_table_allocated_entries = MOUNT_TABLE_ENTRIES;
536 	mount_table_entries = 0;
537 	mount_table = xmalloc(
538 	    mount_table_allocated_entries * sizeof (struct mtab_entry));
539 
540 	while ((status = getextmntent(fp, &mtab, sizeof (struct extmnttab)))
541 	    == 0) {
542 		struct mtab_entry *mtep;
543 
544 		if (mount_table_entries == mount_table_allocated_entries) {
545 			mount_table_allocated_entries += MOUNT_TABLE_ENTRIES;
546 			mount_table = xrealloc(mount_table,
547 			    mount_table_allocated_entries *
548 			    sizeof (struct mtab_entry));
549 		}
550 		mtep = &mount_table[mount_table_entries++];
551 		mtep->mte_mount = mntdup(&mtab);
552 		mtep->mte_dev_is_valid = FALSE;
553 		mtep->mte_ignore = (hasmntopt((struct mnttab *)&mtab,
554 		    MNTOPT_IGNORE) != NULL);
555 	}
556 
557 	(void) fclose(fp);
558 
559 	if (status == -1)			/* reached EOF */
560 		return;
561 	mtab_error(mtab_file, status);
562 	/* NOTREACHED */
563 }
564 
565 
566 /*
567  * We use this macro when we want to record the option for the purpose of
568  * passing it to the FS-specific df
569  */
570 #define	SET_OPTION(opt)		opt##_option = TRUE, \
571 				df_options[df_options_len++] = arg
572 
573 static void
574 parse_options(int argc, char *argv[])
575 {
576 	int arg;
577 
578 	opterr = 0;	/* getopt shouldn't complain about unknown options */
579 
580 #ifdef XPG4
581 	while ((arg = getopt(argc, argv, "F:o:abehkVtgnlPZ")) != EOF) {
582 #else
583 	while ((arg = getopt(argc, argv, "F:o:abehkVtgnlvZ")) != EOF) {
584 #endif
585 		if (arg == 'F') {
586 			if (F_option)
587 				errmsg(ERR_FATAL + ERR_USAGE,
588 				    "more than one FSType specified");
589 			F_option = 1;
590 			FSType = optarg;
591 		} else if (arg == 'V' && ! V_option) {
592 			V_option = TRUE;
593 		} else if (arg == 'v' && ! v_option) {
594 			v_option = TRUE;
595 #ifdef XPG4
596 		} else if (arg == 'P' && ! P_option) {
597 			SET_OPTION(P);
598 #endif
599 		} else if (arg == 'a' && ! a_option) {
600 			SET_OPTION(a);
601 		} else if (arg == 'b' && ! b_option) {
602 			SET_OPTION(b);
603 		} else if (arg == 'e' && ! e_option) {
604 			SET_OPTION(e);
605 		} else if (arg == 'g' && ! g_option) {
606 			SET_OPTION(g);
607 		} else if (arg == 'h') {
608 			use_scaling = TRUE;
609 			scale = 1024;
610 		} else if (arg == 'k' && ! k_option) {
611 			SET_OPTION(k);
612 		} else if (arg == 'l' && ! l_option) {
613 			SET_OPTION(l);
614 		} else if (arg == 'n' && ! n_option) {
615 			SET_OPTION(n);
616 		} else if (arg == 't' && ! t_option) {
617 			SET_OPTION(t);
618 		} else if (arg == 'o') {
619 			if (o_option)
620 				errmsg(ERR_FATAL + ERR_USAGE,
621 				"the -o option can only be specified once");
622 			o_option = TRUE;
623 			o_option_arg = optarg;
624 		} else if (arg == 'Z') {
625 			SET_OPTION(Z);
626 		} else if (arg == '?') {
627 			errmsg(ERR_USAGE, "unknown option: %c", optopt);
628 		}
629 	}
630 
631 	/*
632 	 * Option sanity checks
633 	 */
634 	if (g_option && o_option)
635 		errmsg(ERR_FATAL, "-o and -g options are incompatible");
636 	if (l_option && o_option)
637 		errmsg(ERR_FATAL, "-o and -l options are incompatible");
638 	if (n_option && o_option)
639 		errmsg(ERR_FATAL, "-o and -n options are incompatible");
640 	if (use_scaling && o_option)
641 		errmsg(ERR_FATAL, "-o and -h options are incompatible");
642 }
643 
644 
645 
646 /*
647  * Check if the user-specified argument is a resource name.
648  * A resource name is whatever is placed in the mnt_special field of
649  * struct mnttab. In the case of NFS, a resource name has the form
650  * hostname:pathname
651  * We try to find an exact match between the user-specified argument
652  * and the mnt_special field of a mount table entry.
653  * We also use the heuristic of removing the basename from the user-specified
654  * argument and repeating the test until we get a match. This works
655  * fine for NFS but may fail for other remote file system types. However,
656  * it is guaranteed that the function will not fail if the user specifies
657  * the exact resource name.
658  * If successful, this function sets the 'dfr_mte' field of '*dfrp'
659  */
660 static void
661 resource_mount_entry(struct df_request *dfrp)
662 {
663 	char *name;
664 
665 	/*
666 	 * We need our own copy since we will modify the string
667 	 */
668 	name = new_string(dfrp->dfr_cmd_arg);
669 
670 	for (;;) {
671 		char *p;
672 		int i;
673 
674 		/*
675 		 * Compare against all known mount points.
676 		 * We start from the most recent mount, which is at the
677 		 * end of the array.
678 		 */
679 		for (i = mount_table_entries - 1; i >= 0; i--) {
680 			struct mtab_entry *mtep = &mount_table[i];
681 
682 			if (EQ(name, mtep->mte_mount->mnt_special)) {
683 				dfrp->dfr_mte = mtep;
684 				break;
685 			}
686 		}
687 
688 		/*
689 		 * Remove the last component of the pathname.
690 		 * If there is no such component, this is not a resource name.
691 		 */
692 		p = strrchr(name, '/');
693 		if (p == NULL)
694 			break;
695 		*p = NUL;
696 	}
697 }
698 
699 
700 
701 /*
702  * Try to match the command line argument which is a block special device
703  * with the special device of one of the mounted file systems.
704  * If one is found, set the appropriate field of 'dfrp' to the mount
705  * table entry.
706  */
707 static void
708 bdev_mount_entry(struct df_request *dfrp)
709 {
710 	int i;
711 	char *special = dfrp->dfr_cmd_arg;
712 
713 	/*
714 	 * Compare against all known mount points.
715 	 * We start from the most recent mount, which is at the
716 	 * end of the array.
717 	 */
718 	for (i = mount_table_entries - 1; i >= 0; i--) {
719 		struct mtab_entry *mtep = &mount_table[i];
720 
721 		if (EQ(special, mtep->mte_mount->mnt_special)) {
722 			dfrp->dfr_mte = mtep;
723 			break;
724 		}
725 	}
726 }
727 
728 static struct mtab_entry *
729 devid_matches(int i, dev_t devno)
730 {
731 	struct mtab_entry	*mtep = &mount_table[i];
732 	struct extmnttab	*mtp = mtep->mte_mount;
733 	/* int	len = strlen(mtp->mnt_mountp); */
734 
735 	if (EQ(mtp->mnt_fstype, MNTTYPE_SWAP))
736 		return (NULL);
737 	/*
738 	 * check if device numbers match. If there is a cached device number
739 	 * in the mtab_entry, use it, otherwise get the device number
740 	 * either from the mnttab entry or by stat'ing the mount point.
741 	 */
742 	if (! mtep->mte_dev_is_valid) {
743 		struct stat64 st;
744 		dev_t dev = NODEV;
745 
746 		dev = makedev(mtp->mnt_major, mtp->mnt_minor);
747 		if (dev == 0)
748 			dev = NODEV;
749 		if (dev == NODEV) {
750 			if (stat64(mtp->mnt_mountp, &st) == -1) {
751 				return (NULL);
752 			} else {
753 				dev = st.st_dev;
754 			}
755 		}
756 		mtep->mte_dev = dev;
757 		mtep->mte_dev_is_valid = TRUE;
758 	}
759 	if (mtep->mte_dev == devno) {
760 		return (mtep);
761 	}
762 	return (NULL);
763 }
764 
765 /*
766  * Find the mount point under which the user-specified path resides
767  * and set the 'dfr_mte' field of '*dfrp' to point to the mount table entry.
768  */
769 static void
770 path_mount_entry(struct df_request *dfrp, dev_t devno)
771 {
772 	char			dirpath[MAXPATHLEN];
773 	char			*dir = dfrp->dfr_cmd_arg;
774 	struct mtab_entry	*match, *tmatch;
775 	int i;
776 
777 	/*
778 	 * Expand the given path to get a canonical version (i.e. an absolute
779 	 * path without symbolic links).
780 	 */
781 	if (realpath(dir, dirpath) == NULL) {
782 		errmsg(ERR_PERROR, "cannot canonicalize %s:", dir);
783 		return;
784 	}
785 	/*
786 	 * If the mnt point is lofs, search from the top of entries from
787 	 * /etc/mnttab and return the entry that best matches the pathname.
788 	 * For non-lofs mount points, return the first entry from the bottom
789 	 * of the entries in /etc/mnttab that matches on the devid field
790 	 */
791 	match = NULL;
792 	if (dfrp->dfr_fstype && EQ(dfrp->dfr_fstype, MNTTYPE_LOFS)) {
793 		struct extmnttab *entryp;
794 		char *path, *mountp;
795 		char p, m;
796 		int score;
797 		int best_score = 0;
798 		int best_index = -1;
799 
800 		for (i = 0; i < mount_table_entries; i++) {
801 			entryp = mount_table[i].mte_mount;
802 
803 			if (!EQ(entryp->mnt_fstype, MNTTYPE_LOFS))
804 				continue;
805 
806 			path = dirpath;
807 			mountp = entryp->mnt_mountp;
808 			score = 0;
809 			/*
810 			 * Count the number of matching characters
811 			 * until either path or mountpoint is exhausted
812 			 */
813 			while ((p = *path++) == (m = *mountp++)) {
814 				score++;
815 
816 				if (p == '\0' || m == '\0')
817 					break;
818 			}
819 
820 			/* Both exhausted so we have a match */
821 			if (p == '\0' && m == '\0') {
822 				best_index = i;
823 				break;
824 			}
825 
826 			/*
827 			 * We have exhausted the mountpoint and the current
828 			 * character in the path is a '/' hence the full path
829 			 * traverses this mountpoint.
830 			 * Record this as the best candidate so far.
831 			 */
832 			if (p == '/' && m == '\0') {
833 				if (score > best_score) {
834 					best_index = i;
835 					best_score = score;
836 				}
837 			}
838 		}
839 
840 		if (best_index > -1)
841 			match = &mount_table[best_index];
842 	} else {
843 		for (i = mount_table_entries - 1; i >= 0; i--) {
844 			if (tmatch = devid_matches(i, devno)) {
845 				/*
846 				 * If executing in a zone, there might be lofs
847 				 * mounts for which the real mount point is
848 				 * invisible; accept the "best fit" for this
849 				 * devid.
850 				 */
851 				match = tmatch;
852 				if (!EQ(match->mte_mount->mnt_fstype,
853 				    MNTTYPE_LOFS)) {
854 					break;
855 				}
856 			}
857 		}
858 	}
859 	if (! match) {
860 		errmsg(ERR_NOFLAGS,
861 		    "Could not find mount point for %s", dir);
862 		return;
863 	}
864 	dfrp->dfr_mte = match;
865 }
866 
867 /*
868  * Execute a single FS-specific df command for all given requests
869  * Return 0 if successful, 1 otherwise.
870  */
871 static int
872 run_fs_specific_df(struct df_request request_list[], int entries)
873 {
874 	int	i;
875 	int	argv_index;
876 	char	**argv;
877 	size_t	size;
878 	pid_t	pid;
879 	int	status;
880 	char	cmd_path[MAXPATHLEN];
881 	char	*fstype;
882 
883 	if (entries == 0)
884 		return (0);
885 
886 	fstype = request_list[0].dfr_fstype;
887 
888 	if (F_option && ! EQ(FSType, fstype))
889 		return (0);
890 
891 	(void) sprintf(cmd_path, "%s%s/df", FS_LIBPATH, fstype);
892 	/*
893 	 * Argv entries:
894 	 *		1 for the path
895 	 *		2 for -o <options>
896 	 *		1 for the generic options that we propagate
897 	 *		1 for the terminating NULL pointer
898 	 *		n for the number of user-specified arguments
899 	 */
900 	size = (5 + entries) * sizeof (char *);
901 	argv = xmalloc(size);
902 	(void) memset(argv, 0, size);
903 
904 	argv[0] = cmd_path;
905 	argv_index = 1;
906 	if (o_option) {
907 		argv[argv_index++] = "-o";
908 		argv[argv_index++] = o_option_arg;
909 	}
910 
911 	/*
912 	 * Check if we need to propagate any generic options
913 	 */
914 	if (df_options_len > 1)
915 		argv[argv_index++] = df_options;
916 
917 	/*
918 	 * If there is a user-specified path, we pass that to the
919 	 * FS-specific df. Otherwise, we are guaranteed to have a mount
920 	 * point, since a request without a user path implies that
921 	 * we are reporting only on mounted file systems.
922 	 */
923 	for (i = 0; i < entries; i++) {
924 		struct df_request *dfrp = &request_list[i];
925 
926 		argv[argv_index++] = (dfrp->dfr_cmd_arg == NULL)
927 		    ? DFR_MOUNT_POINT(dfrp)
928 		    : dfrp->dfr_cmd_arg;
929 	}
930 
931 	if (V_option) {
932 		for (i = 0; i < argv_index-1; i++)
933 			(void) printf("%s ", argv[i]);
934 		(void) printf("%s\n", argv[i]);
935 		return (0);
936 	}
937 
938 	pid = fork();
939 
940 	if (pid == -1) {
941 		errmsg(ERR_PERROR, "cannot fork process:");
942 		return (1);
943 	} else if (pid == 0) {
944 		(void) execv(cmd_path, argv);
945 		if (errno == ENOENT)
946 			errmsg(ERR_NOFLAGS,
947 			    "operation not applicable for FSType %s",
948 			    fstype);
949 		else
950 			errmsg(ERR_PERROR, "cannot execute %s:", cmd_path);
951 		exit(2);
952 	}
953 
954 	/*
955 	 * Reap the child
956 	 */
957 	for (;;) {
958 		pid_t wpid = waitpid(pid, &status, 0);
959 
960 		if (wpid == -1)
961 			if (errno == EINTR)
962 				continue;
963 			else {
964 				errmsg(ERR_PERROR, "waitpid error:");
965 				return (1);
966 			}
967 		else
968 			break;
969 	}
970 
971 	return ((WIFEXITED(status) && WEXITSTATUS(status) == 0) ? 0 : 1);
972 }
973 
974 
975 
976 /*
977  * Remove from the request list all requests that do not apply.
978  * Notice that the subsequent processing of the requests depends on
979  * the sanity checking performed by this function.
980  */
981 static int
982 prune_list(struct df_request request_list[],
983 		size_t n_requests,
984 		size_t *valid_requests)
985 {
986 	size_t	i;
987 	size_t	n_valid = 0;
988 	int	errors = 0;
989 
990 	for (i = 0; i < n_requests; i++) {
991 		struct df_request *dfrp = &request_list[i];
992 
993 		/*
994 		 * Skip file systems that are not mounted if either the
995 		 * -l or -n options were specified. If none of these options
996 		 * are present, the appropriate FS-specific df will be invoked.
997 		 */
998 		if (! DFR_ISMOUNTEDFS(dfrp)) {
999 			if (l_option || n_option) {
1000 				errmsg(ERR_NOFLAGS,
1001 				    "%s option incompatible with unmounted "
1002 				    "special device (%s)",
1003 				    l_option ? "-l" : "-n", dfrp->dfr_cmd_arg);
1004 				dfrp->dfr_valid = FALSE;
1005 				errors++;
1006 			}
1007 			else
1008 				n_valid++;
1009 			continue;
1010 		}
1011 
1012 		/*
1013 		 * Check for inconsistency between the argument of -F and
1014 		 * the actual file system type.
1015 		 * If there is an inconsistency and the user specified a
1016 		 * path, this is an error since we are asked to interpret
1017 		 * the path using the wrong file system type. If there is
1018 		 * no path associated with this request, we quietly ignore it.
1019 		 */
1020 		if (F_option && ! EQ(dfrp->dfr_fstype, FSType)) {
1021 			dfrp->dfr_valid = FALSE;
1022 			if (dfrp->dfr_cmd_arg != NULL) {
1023 				errmsg(ERR_NOFLAGS,
1024 				"Warning: %s mounted as a %s file system",
1025 				    dfrp->dfr_cmd_arg, dfrp->dfr_fstype);
1026 				errors++;
1027 			}
1028 			continue;
1029 		}
1030 
1031 		/*
1032 		 * Skip remote file systems if the -l option is present
1033 		 */
1034 		if (l_option && is_remote_fs(dfrp->dfr_fstype)) {
1035 			if (dfrp->dfr_cmd_arg != NULL) {
1036 				errmsg(ERR_NOFLAGS,
1037 				    "Warning: %s is not a local file system",
1038 				    dfrp->dfr_cmd_arg);
1039 				errors++;
1040 			}
1041 			dfrp->dfr_valid = FALSE;
1042 			continue;
1043 		}
1044 
1045 		/*
1046 		 * Skip file systems mounted as "ignore" unless the -a option
1047 		 * is present, or the user explicitly specified them on
1048 		 * the command line.
1049 		 */
1050 		if (dfrp->dfr_mte->mte_ignore &&
1051 		    ! (a_option || dfrp->dfr_cmd_arg)) {
1052 			dfrp->dfr_valid = FALSE;
1053 			continue;
1054 		}
1055 
1056 		n_valid++;
1057 	}
1058 	*valid_requests = n_valid;
1059 	return (errors);
1060 }
1061 
1062 
1063 /*
1064  * Print the appropriate header for the requested output format.
1065  * Options are checked in order of their precedence.
1066  */
1067 static void
1068 print_header(void)
1069 {
1070 	if (use_scaling) { /* this comes from the -h option */
1071 		int arg = 'h';
1072 
1073 		(void) printf("%-*s %*s %*s %*s %-*s %s\n",
1074 		    FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1075 #ifdef XPG4
1076 		    SCALED_WIDTH, TRANSLATE("Size"),
1077 		    SCALED_WIDTH, TRANSLATE("Used"),
1078 		    AVAILABLE_WIDTH, TRANSLATE("Available"),
1079 		    CAPACITY_WIDTH, TRANSLATE("Capacity"),
1080 #else
1081 		    SCALED_WIDTH, TRANSLATE("size"),
1082 		    SCALED_WIDTH, TRANSLATE("used"),
1083 		    AVAILABLE_WIDTH, TRANSLATE("avail"),
1084 		    CAPACITY_WIDTH, TRANSLATE("capacity"),
1085 #endif
1086 		    TRANSLATE("Mounted on"));
1087 		SET_OPTION(h);
1088 		return;
1089 	}
1090 	if (k_option) {
1091 		int arg = 'h';
1092 
1093 		(void) printf(gettext("%-*s %*s %*s %*s %-*s %s\n"),
1094 		    FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1095 #ifdef XPG4
1096 		    KBYTE_WIDTH, TRANSLATE("1024-blocks"),
1097 		    KBYTE_WIDTH, TRANSLATE("Used"),
1098 		    KBYTE_WIDTH, TRANSLATE("Available"),
1099 		    CAPACITY_WIDTH, TRANSLATE("Capacity"),
1100 #else
1101 		    KBYTE_WIDTH, TRANSLATE("kbytes"),
1102 		    KBYTE_WIDTH, TRANSLATE("used"),
1103 		    KBYTE_WIDTH, TRANSLATE("avail"),
1104 		    CAPACITY_WIDTH, TRANSLATE("capacity"),
1105 #endif
1106 		    TRANSLATE("Mounted on"));
1107 		SET_OPTION(h);
1108 		return;
1109 	}
1110 	/* Added for XCU4 compliance */
1111 	if (P_option) {
1112 		int arg = 'h';
1113 
1114 		(void) printf(gettext("%-*s %*s %*s %*s %-*s %s\n"),
1115 		    FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1116 		    KBYTE_WIDTH, TRANSLATE("512-blocks"),
1117 		    KBYTE_WIDTH, TRANSLATE("Used"),
1118 		    KBYTE_WIDTH, TRANSLATE("Available"),
1119 		    CAPACITY_WIDTH, TRANSLATE("Capacity"),
1120 		    TRANSLATE("Mounted on"));
1121 
1122 		SET_OPTION(h);
1123 		return;
1124 	}
1125 	/* End XCU4 */
1126 	if (v_option) {
1127 		(void) printf("%-*s %-*s %*s %*s %*s %-*s\n",
1128 		    IBCS2_MOUNT_POINT_WIDTH, TRANSLATE("Mount Dir"),
1129 		    IBCS2_FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1130 		    BLOCK_WIDTH, TRANSLATE("blocks"),
1131 		    BLOCK_WIDTH, TRANSLATE("used"),
1132 		    BLOCK_WIDTH, TRANSLATE("free"),
1133 		    CAPACITY_WIDTH, TRANSLATE(" %used"));
1134 		return;
1135 	}
1136 	if (e_option) {
1137 		(void) printf(gettext("%-*s %*s\n"),
1138 		    FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1139 		    BLOCK_WIDTH, TRANSLATE("ifree"));
1140 		return;
1141 	}
1142 	if (b_option) {
1143 		(void) printf(gettext("%-*s %*s\n"),
1144 		    FILESYSTEM_WIDTH, TRANSLATE("Filesystem"),
1145 		    BLOCK_WIDTH, TRANSLATE("avail"));
1146 		return;
1147 	}
1148 }
1149 
1150 
1151 /*
1152  * Convert an unsigned long long to a string representation and place the
1153  * result in the caller-supplied buffer.
1154  * The given number is in units of "unit_from" size, but the
1155  * converted number will be in units of "unit_to" size. The unit sizes
1156  * must be powers of 2.
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_string(
1163 			char *buf,		/* put the result here */
1164 			unsigned long long number, /* convert this number */
1165 			int unit_from,		/* from units of this size */
1166 			int unit_to)		/* to units of this size */
1167 {
1168 	if ((long long)number == (long long)-1)
1169 		(void) strcpy(buf, "-1");
1170 	else {
1171 		if (unit_from == unit_to)
1172 			(void) sprintf(buf, "%llu", number);
1173 		else if (unit_from < unit_to)
1174 			(void) sprintf(buf, "%llu",
1175 			    number / (unsigned long long)(unit_to / unit_from));
1176 		else
1177 			(void) sprintf(buf, "%llu",
1178 			    number * (unsigned long long)(unit_from / unit_to));
1179 	}
1180 	return (buf);
1181 }
1182 
1183 /*
1184  * Convert an unsigned long long to a string representation and place the
1185  * result in the caller-supplied buffer.
1186  * The given number is in units of "unit_from" size,
1187  * this will first be converted to a number in 1024 or 1000 byte size,
1188  * depending on the scaling factor.
1189  * Then the number is scaled down until it is small enough to be in a good
1190  * human readable format i.e. in the range 0 thru scale-1.
1191  * If it's smaller than 10 there's room enough to provide one decimal place.
1192  * The value "(unsigned long long)-1" is a special case and is always
1193  * converted to "-1".
1194  * Returns a pointer to the caller-supplied buffer.
1195  */
1196 static char *
1197 number_to_scaled_string(
1198 			numbuf_t buf,		/* put the result here */
1199 			unsigned long long number, /* convert this number */
1200 			int unit_from,
1201 			int scale)
1202 {
1203 	unsigned long long save = 0;
1204 	char *M = "KMGTPE"; /* Measurement: kilo, mega, giga, tera, peta, exa */
1205 	char *uom = M;    /* unit of measurement, initially 'K' (=M[0]) */
1206 
1207 	if ((long long)number == (long long)-1) {
1208 		(void) strcpy(buf, "-1");
1209 		return (buf);
1210 	}
1211 
1212 	/*
1213 	 * Convert number from unit_from to given scale (1024 or 1000).
1214 	 * This means multiply number by unit_from and divide by scale.
1215 	 *
1216 	 * Would like to multiply by unit_from and then divide by scale,
1217 	 * but if the first multiplication would overflow, then need to
1218 	 * divide by scale and then multiply by unit_from.
1219 	 */
1220 	if (number > (UINT64_MAX / (unsigned long long)unit_from)) {
1221 		number = (number / (unsigned long long)scale) *
1222 		    (unsigned long long)unit_from;
1223 	} else {
1224 		number = (number * (unsigned long long)unit_from) /
1225 		    (unsigned long long)scale;
1226 	}
1227 
1228 	/*
1229 	 * Now we have number as a count of scale units.
1230 	 * Stop scaling when we reached exa bytes, then something is
1231 	 * probably wrong with our number.
1232 	 */
1233 
1234 	while ((number >= scale) && (*uom != 'E')) {
1235 		uom++; /* next unit of measurement */
1236 		save = number;
1237 		number = (number + (scale / 2)) / scale;
1238 	}
1239 	/* check if we should output a decimal place after the point */
1240 	if (save && ((save / scale) < 10)) {
1241 		/* sprintf() will round for us */
1242 		float fnum = (float)save / scale;
1243 		(void) sprintf(buf, "%2.1f%c", fnum, *uom);
1244 	} else {
1245 		(void) sprintf(buf, "%4llu%c", number, *uom);
1246 	}
1247 	return (buf);
1248 }
1249 
1250 /*
1251  * The statvfs() implementation allows us to return only two values, the total
1252  * number of blocks and the number of blocks free.  The equation 'used = total -
1253  * free' will not work for ZFS filesystems, due to the nature of pooled storage.
1254  * We choose to return values in the statvfs structure that will produce correct
1255  * results for 'used' and 'available', but not 'total'.  This function will open
1256  * the underlying ZFS dataset if necessary and get the real value.
1257  */
1258 static void
1259 adjust_total_blocks(struct df_request *dfrp, fsblkcnt64_t *total,
1260     uint64_t blocksize)
1261 {
1262 	char *dataset, *slash;
1263 	boolean_t first = TRUE;
1264 	uint64_t quota = 0;
1265 
1266 	if (strcmp(DFR_FSTYPE(dfrp), MNTTYPE_ZFS) != 0 || !load_libzfs())
1267 		return;
1268 
1269 	/*
1270 	 * We want to get the total size for this filesystem as bounded by any
1271 	 * quotas. In order to do this, we start at the current filesystem and
1272 	 * work upwards looking for the smallest quota.  When we reach the
1273 	 * pool itself, the quota is the amount used plus the amount
1274 	 * available.
1275 	 */
1276 	if ((dataset = strdup(DFR_SPECIAL(dfrp))) == NULL)
1277 		return;
1278 
1279 	slash = dataset + strlen(dataset);
1280 	while (slash != NULL) {
1281 		zfs_handle_t *zhp;
1282 		uint64_t this_quota;
1283 
1284 		*slash = '\0';
1285 
1286 		zhp = _zfs_open(g_zfs, dataset, ZFS_TYPE_DATASET);
1287 		if (zhp == NULL)
1288 			break;
1289 
1290 		/* true at first iteration of loop */
1291 		if (first) {
1292 			quota = _zfs_prop_get_int(zhp, ZFS_PROP_REFQUOTA);
1293 			if (quota == 0)
1294 				quota = UINT64_MAX;
1295 			first = FALSE;
1296 		}
1297 
1298 		this_quota = _zfs_prop_get_int(zhp, ZFS_PROP_QUOTA);
1299 		if (this_quota && this_quota < quota)
1300 			quota = this_quota;
1301 
1302 		/* true at last iteration of loop */
1303 		if ((slash = strrchr(dataset, '/')) == NULL) {
1304 			uint64_t size;
1305 
1306 			size = _zfs_prop_get_int(zhp, ZFS_PROP_USED) +
1307 			    _zfs_prop_get_int(zhp, ZFS_PROP_AVAILABLE);
1308 			if (size < quota)
1309 				quota = size;
1310 		}
1311 
1312 		_zfs_close(zhp);
1313 	}
1314 
1315 	/*
1316 	 * Modify total only if we managed to get some stats from libzfs.
1317 	 */
1318 	if (quota != 0)
1319 		*total = quota / blocksize;
1320 	free(dataset);
1321 }
1322 
1323 /*
1324  * The output will appear properly columnized regardless of the names of
1325  * the various fields
1326  */
1327 static void
1328 g_output(struct df_request *dfrp, struct statvfs64 *fsp)
1329 {
1330 	fsblkcnt64_t	available_blocks	= fsp->f_bavail;
1331 	fsblkcnt64_t	total_blocks = fsp->f_blocks;
1332 	numbuf_t	total_blocks_buf;
1333 	numbuf_t	total_files_buf;
1334 	numbuf_t	free_blocks_buf;
1335 	numbuf_t	available_blocks_buf;
1336 	numbuf_t	free_files_buf;
1337 	numbuf_t	fname_buf;
1338 	char		*temp_buf;
1339 
1340 #define	DEFINE_STR_LEN(var)			\
1341 	static char *var##_str;			\
1342 	static size_t var##_len
1343 
1344 #define	SET_STR_LEN(name, var)\
1345 	if (! var##_str) {\
1346 		var##_str = TRANSLATE(name); \
1347 		var##_len = strlen(var##_str); \
1348 	}
1349 
1350 	DEFINE_STR_LEN(block_size);
1351 	DEFINE_STR_LEN(frag_size);
1352 	DEFINE_STR_LEN(total_blocks);
1353 	DEFINE_STR_LEN(free_blocks);
1354 	DEFINE_STR_LEN(available);
1355 	DEFINE_STR_LEN(total_files);
1356 	DEFINE_STR_LEN(free_files);
1357 	DEFINE_STR_LEN(fstype);
1358 	DEFINE_STR_LEN(fsys_id);
1359 	DEFINE_STR_LEN(fname);
1360 	DEFINE_STR_LEN(flag);
1361 
1362 	/*
1363 	 * TRANSLATION_NOTE
1364 	 * The first argument of each of the following macro invocations is a
1365 	 * string that needs to be translated.
1366 	 */
1367 	SET_STR_LEN("block size", block_size);
1368 	SET_STR_LEN("frag size", frag_size);
1369 	SET_STR_LEN("total blocks", total_blocks);
1370 	SET_STR_LEN("free blocks", free_blocks);
1371 	SET_STR_LEN("available", available);
1372 	SET_STR_LEN("total files", total_files);
1373 	SET_STR_LEN("free files", free_files);
1374 	SET_STR_LEN("fstype", fstype);
1375 	SET_STR_LEN("filesys id", fsys_id);
1376 	SET_STR_LEN("filename length", fname);
1377 	SET_STR_LEN("flag", flag);
1378 
1379 #define	NCOL1_WIDTH	(int)MAX3(BLOCK_WIDTH, NFILES_WIDTH, FSTYPE_WIDTH)
1380 #define	NCOL2_WIDTH	(int)MAX3(BLOCK_WIDTH, FSID_WIDTH, FLAG_WIDTH) + 2
1381 #define	NCOL3_WIDTH	(int)MAX3(BSIZE_WIDTH, BLOCK_WIDTH, NAMELEN_WIDTH)
1382 #define	NCOL4_WIDTH	(int)MAX(FRAGSIZE_WIDTH, NFILES_WIDTH)
1383 
1384 #define	SCOL1_WIDTH	(int)MAX3(total_blocks_len, free_files_len, fstype_len)
1385 #define	SCOL2_WIDTH	(int)MAX3(free_blocks_len, fsys_id_len, flag_len)
1386 #define	SCOL3_WIDTH	(int)MAX3(block_size_len, available_len, fname_len)
1387 #define	SCOL4_WIDTH	(int)MAX(frag_size_len, total_files_len)
1388 
1389 	temp_buf = xmalloc(
1390 	    MAX(MOUNT_POINT_WIDTH, strlen(DFR_MOUNT_POINT(dfrp)))
1391 	    + MAX(SPECIAL_DEVICE_WIDTH, strlen(DFR_SPECIAL(dfrp)))
1392 	    + 20); /* plus slop - nulls & formatting */
1393 	(void) sprintf(temp_buf, "%-*s(%-*s):",
1394 	    MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1395 	    SPECIAL_DEVICE_WIDTH, DFR_SPECIAL(dfrp));
1396 
1397 	(void) printf("%-*s %*lu %-*s %*lu %-*s\n",
1398 	    NCOL1_WIDTH + 1 + SCOL1_WIDTH + 1 + NCOL2_WIDTH + 1 +  SCOL2_WIDTH,
1399 	    temp_buf,
1400 	    NCOL3_WIDTH, fsp->f_bsize, SCOL3_WIDTH, block_size_str,
1401 	    NCOL4_WIDTH, fsp->f_frsize, SCOL4_WIDTH, frag_size_str);
1402 	free(temp_buf);
1403 
1404 	/*
1405 	 * Adjust available_blocks value -  it can be less than 0 on
1406 	 * a 4.x file system. Reset it to 0 in order to avoid printing
1407 	 * negative numbers.
1408 	 */
1409 	if ((long long)available_blocks < (long long)0)
1410 		available_blocks = (fsblkcnt64_t)0;
1411 
1412 	adjust_total_blocks(dfrp, &total_blocks, fsp->f_frsize);
1413 
1414 	(void) printf("%*s %-*s %*s %-*s %*s %-*s %*s %-*s\n",
1415 	    NCOL1_WIDTH, number_to_string(total_blocks_buf,
1416 	    total_blocks, fsp->f_frsize, 512),
1417 	    SCOL1_WIDTH, total_blocks_str,
1418 	    NCOL2_WIDTH, number_to_string(free_blocks_buf,
1419 	    fsp->f_bfree, fsp->f_frsize, 512),
1420 	    SCOL2_WIDTH, free_blocks_str,
1421 	    NCOL3_WIDTH, number_to_string(available_blocks_buf,
1422 	    available_blocks, fsp->f_frsize, 512),
1423 	    SCOL3_WIDTH, available_str,
1424 	    NCOL4_WIDTH, number_to_string(total_files_buf,
1425 	    fsp->f_files, 1, 1),
1426 	    SCOL4_WIDTH, total_files_str);
1427 
1428 	(void) printf("%*s %-*s %*lu %-*s %s\n",
1429 	    NCOL1_WIDTH, number_to_string(free_files_buf,
1430 	    fsp->f_ffree, 1, 1),
1431 	    SCOL1_WIDTH, free_files_str,
1432 	    NCOL2_WIDTH, fsp->f_fsid, SCOL2_WIDTH, fsys_id_str,
1433 	    fsp->f_fstr);
1434 
1435 	(void) printf("%*s %-*s %#*.*lx %-*s %*s %-*s\n\n",
1436 	    NCOL1_WIDTH, fsp->f_basetype, SCOL1_WIDTH, fstype_str,
1437 	    NCOL2_WIDTH, NCOL2_WIDTH-2, fsp->f_flag, SCOL2_WIDTH, flag_str,
1438 	    NCOL3_WIDTH, number_to_string(fname_buf,
1439 	    (unsigned long long)fsp->f_namemax, 1, 1),
1440 	    SCOL3_WIDTH, fname_str);
1441 }
1442 
1443 
1444 static void
1445 k_output(struct df_request *dfrp, struct statvfs64 *fsp)
1446 {
1447 	fsblkcnt64_t total_blocks		= fsp->f_blocks;
1448 	fsblkcnt64_t	free_blocks		= fsp->f_bfree;
1449 	fsblkcnt64_t	available_blocks	= fsp->f_bavail;
1450 	fsblkcnt64_t	used_blocks;
1451 	char 		*file_system		= DFR_SPECIAL(dfrp);
1452 	numbuf_t	total_blocks_buf;
1453 	numbuf_t	used_blocks_buf;
1454 	numbuf_t	available_blocks_buf;
1455 	char 		capacity_buf[LINEBUF_SIZE];
1456 
1457 	/*
1458 	 * If the free block count is -1, don't trust anything but the total
1459 	 * number of blocks.
1460 	 */
1461 	if (free_blocks == (fsblkcnt64_t)-1) {
1462 		used_blocks = (fsblkcnt64_t)-1;
1463 		(void) strcpy(capacity_buf, "  100%");
1464 	} else {
1465 		fsblkcnt64_t reserved_blocks = free_blocks - available_blocks;
1466 
1467 		used_blocks	= total_blocks - free_blocks;
1468 
1469 		/*
1470 		 * The capacity estimation is bogus when available_blocks is 0
1471 		 * and the super-user has allocated more space. The reason
1472 		 * is that reserved_blocks is inaccurate in that case, because
1473 		 * when the super-user allocates space, free_blocks is updated
1474 		 * but available_blocks is not (since it can't drop below 0).
1475 		 *
1476 		 * XCU4 and POSIX.2 require that any fractional result of the
1477 		 * capacity estimation be rounded to the next highest integer,
1478 		 * hence the addition of 0.5.
1479 		 */
1480 		(void) sprintf(capacity_buf, "%5.0f%%",
1481 		    (total_blocks == 0) ? 0.0 :
1482 		    ((double)used_blocks /
1483 		    (double)(total_blocks - reserved_blocks))
1484 		    * 100.0 + 0.5);
1485 	}
1486 
1487 	/*
1488 	 * The available_blocks can be less than 0 on a 4.x file system.
1489 	 * Reset it to 0 in order to avoid printing negative numbers.
1490 	 */
1491 	if ((long long)available_blocks < (long long)0)
1492 		available_blocks = (fsblkcnt64_t)0;
1493 	/*
1494 	 * Print long special device names (usually NFS mounts) in a line
1495 	 * by themselves when the output is directed to a terminal.
1496 	 */
1497 	if (tty_output && strlen(file_system) > (size_t)FILESYSTEM_WIDTH) {
1498 		(void) printf("%s\n", file_system);
1499 		file_system = "";
1500 	}
1501 
1502 	adjust_total_blocks(dfrp, &total_blocks, fsp->f_frsize);
1503 
1504 	if (use_scaling) { /* comes from the -h option */
1505 	(void) printf("%-*s %*s %*s %*s %-*s %-s\n",
1506 	    FILESYSTEM_WIDTH, file_system,
1507 	    SCALED_WIDTH, number_to_scaled_string(total_blocks_buf,
1508 	    total_blocks, fsp->f_frsize, scale),
1509 	    SCALED_WIDTH, number_to_scaled_string(used_blocks_buf,
1510 	    used_blocks, fsp->f_frsize, scale),
1511 	    AVAILABLE_WIDTH, number_to_scaled_string(available_blocks_buf,
1512 	    available_blocks, fsp->f_frsize, scale),
1513 	    CAPACITY_WIDTH, capacity_buf,
1514 	    DFR_MOUNT_POINT(dfrp));
1515 		return;
1516 	}
1517 
1518 	if (v_option) {
1519 	(void) printf("%-*.*s %-*.*s %*lld %*lld %*lld %-.*s\n",
1520 	    IBCS2_MOUNT_POINT_WIDTH, IBCS2_MOUNT_POINT_WIDTH,
1521 	    DFR_MOUNT_POINT(dfrp),
1522 	    IBCS2_FILESYSTEM_WIDTH, IBCS2_FILESYSTEM_WIDTH, file_system,
1523 	    BLOCK_WIDTH, total_blocks,
1524 	    BLOCK_WIDTH, used_blocks,
1525 	    BLOCK_WIDTH, available_blocks,
1526 	    CAPACITY_WIDTH,	capacity_buf);
1527 		return;
1528 	}
1529 
1530 	if (P_option && !k_option) {
1531 	(void) printf("%-*s %*s %*s %*s %-*s %-s\n",
1532 	    FILESYSTEM_WIDTH, file_system,
1533 	    KBYTE_WIDTH, number_to_string(total_blocks_buf,
1534 	    total_blocks, fsp->f_frsize, 512),
1535 	    KBYTE_WIDTH, number_to_string(used_blocks_buf,
1536 	    used_blocks, fsp->f_frsize, 512),
1537 	    KBYTE_WIDTH, number_to_string(available_blocks_buf,
1538 	    available_blocks, fsp->f_frsize, 512),
1539 	    CAPACITY_WIDTH, capacity_buf,
1540 	    DFR_MOUNT_POINT(dfrp));
1541 	} else {
1542 	(void) printf("%-*s %*s %*s %*s %-*s %-s\n",
1543 	    FILESYSTEM_WIDTH, file_system,
1544 	    KBYTE_WIDTH, number_to_string(total_blocks_buf,
1545 	    total_blocks, fsp->f_frsize, 1024),
1546 	    KBYTE_WIDTH, number_to_string(used_blocks_buf,
1547 	    used_blocks, fsp->f_frsize, 1024),
1548 	    KBYTE_WIDTH, number_to_string(available_blocks_buf,
1549 	    available_blocks, fsp->f_frsize, 1024),
1550 	    CAPACITY_WIDTH,	capacity_buf,
1551 	    DFR_MOUNT_POINT(dfrp));
1552 	}
1553 }
1554 
1555 /*
1556  * The following is for internationalization support.
1557  */
1558 static bool_int strings_initialized;
1559 static char 	*files_str;
1560 static char	*blocks_str;
1561 static char	*total_str;
1562 static char	*kilobytes_str;
1563 
1564 static void
1565 strings_init(void)
1566 {
1567 	total_str = TRANSLATE("total");
1568 	files_str = TRANSLATE("files");
1569 	blocks_str = TRANSLATE("blocks");
1570 	kilobytes_str = TRANSLATE("kilobytes");
1571 	strings_initialized = TRUE;
1572 }
1573 
1574 #define	STRINGS_INIT()		if (!strings_initialized) strings_init()
1575 
1576 
1577 static void
1578 t_output(struct df_request *dfrp, struct statvfs64 *fsp)
1579 {
1580 	fsblkcnt64_t	total_blocks = fsp->f_blocks;
1581 	numbuf_t	total_blocks_buf;
1582 	numbuf_t	total_files_buf;
1583 	numbuf_t	free_blocks_buf;
1584 	numbuf_t	free_files_buf;
1585 
1586 	STRINGS_INIT();
1587 
1588 	adjust_total_blocks(dfrp, &total_blocks, fsp->f_frsize);
1589 
1590 	(void) printf("%-*s(%-*s): %*s %s %*s %s\n",
1591 	    MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1592 	    SPECIAL_DEVICE_WIDTH, DFR_SPECIAL(dfrp),
1593 	    BLOCK_WIDTH, number_to_string(free_blocks_buf,
1594 	    fsp->f_bfree, fsp->f_frsize, 512),
1595 	    blocks_str,
1596 	    NFILES_WIDTH, number_to_string(free_files_buf,
1597 	    fsp->f_ffree, 1, 1),
1598 	    files_str);
1599 	/*
1600 	 * The total column used to use the same space as the mnt pt & special
1601 	 * dev fields. However, this doesn't work with massive special dev
1602 	 * fields * (eg > 500 chars) causing an enormous amount of white space
1603 	 * before the total column (see bug 4100411). So the code was
1604 	 * simplified to set the total column at the usual gap.
1605 	 * This had the side effect of fixing a bug where the previously
1606 	 * used static buffer was overflowed by the same massive special dev.
1607 	 */
1608 	(void) printf("%*s: %*s %s %*s %s\n",
1609 	    MNT_SPEC_WIDTH, total_str,
1610 	    BLOCK_WIDTH, number_to_string(total_blocks_buf,
1611 	    total_blocks, fsp->f_frsize, 512),
1612 	    blocks_str,
1613 	    NFILES_WIDTH, number_to_string(total_files_buf,
1614 	    fsp->f_files, 1, 1),
1615 	    files_str);
1616 }
1617 
1618 
1619 static void
1620 eb_output(struct df_request *dfrp, struct statvfs64 *fsp)
1621 {
1622 	numbuf_t free_files_buf;
1623 	numbuf_t free_kbytes_buf;
1624 
1625 	STRINGS_INIT();
1626 
1627 	(void) printf("%-*s(%-*s): %*s %s\n",
1628 	    MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1629 	    SPECIAL_DEVICE_WIDTH, DFR_SPECIAL(dfrp),
1630 	    MAX(KBYTE_WIDTH, NFILES_WIDTH),
1631 	    number_to_string(free_kbytes_buf,
1632 	    fsp->f_bfree, fsp->f_frsize, 1024),
1633 	    kilobytes_str);
1634 	(void) printf("%-*s(%-*s): %*s %s\n",
1635 	    MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1636 	    SPECIAL_DEVICE_WIDTH, DFR_SPECIAL(dfrp),
1637 	    MAX(NFILES_WIDTH, NFILES_WIDTH),
1638 	    number_to_string(free_files_buf, fsp->f_ffree, 1, 1),
1639 	    files_str);
1640 }
1641 
1642 
1643 static void
1644 e_output(struct df_request *dfrp, struct statvfs64 *fsp)
1645 {
1646 	numbuf_t free_files_buf;
1647 
1648 	(void) printf("%-*s %*s\n",
1649 	    FILESYSTEM_WIDTH, DFR_SPECIAL(dfrp),
1650 	    NFILES_WIDTH,
1651 	    number_to_string(free_files_buf, fsp->f_ffree, 1, 1));
1652 }
1653 
1654 
1655 static void
1656 b_output(struct df_request *dfrp, struct statvfs64 *fsp)
1657 {
1658 	numbuf_t free_blocks_buf;
1659 
1660 	(void) printf("%-*s %*s\n",
1661 	    FILESYSTEM_WIDTH, DFR_SPECIAL(dfrp),
1662 	    BLOCK_WIDTH, number_to_string(free_blocks_buf,
1663 	    fsp->f_bfree, fsp->f_frsize, 1024));
1664 }
1665 
1666 
1667 /* ARGSUSED */
1668 static void
1669 n_output(struct df_request *dfrp, struct statvfs64 *fsp)
1670 {
1671 	(void) printf("%-*s: %-*s\n",
1672 	    MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1673 	    FSTYPE_WIDTH, dfrp->dfr_fstype);
1674 }
1675 
1676 
1677 static void
1678 default_output(struct df_request *dfrp, struct statvfs64 *fsp)
1679 {
1680 	numbuf_t free_blocks_buf;
1681 	numbuf_t free_files_buf;
1682 
1683 	STRINGS_INIT();
1684 
1685 	(void) printf("%-*s(%-*s):%*s %s %*s %s\n",
1686 	    MOUNT_POINT_WIDTH, DFR_MOUNT_POINT(dfrp),
1687 	    SPECIAL_DEVICE_WIDTH, DFR_SPECIAL(dfrp),
1688 	    BLOCK_WIDTH, number_to_string(free_blocks_buf,
1689 	    fsp->f_bfree, fsp->f_frsize, 512),
1690 	    blocks_str,
1691 	    NFILES_WIDTH, number_to_string(free_files_buf,
1692 	    fsp->f_ffree, 1, 1),
1693 	    files_str);
1694 }
1695 
1696 
1697 /* ARGSUSED */
1698 static void
1699 V_output(struct df_request *dfrp, struct statvfs64 *fsp)
1700 {
1701 	char temp_buf[LINEBUF_SIZE];
1702 
1703 	if (df_options_len > 1)
1704 		(void) strcat(strcpy(temp_buf, df_options), " ");
1705 	else
1706 		temp_buf[0] = NUL;
1707 
1708 	(void) printf("%s -F %s %s%s\n",
1709 	    program_name, dfrp->dfr_fstype, temp_buf,
1710 	    dfrp->dfr_cmd_arg ? dfrp->dfr_cmd_arg: DFR_SPECIAL(dfrp));
1711 }
1712 
1713 
1714 /*
1715  * This function is used to sort the array of df_requests according to fstype
1716  */
1717 static int
1718 df_reqcomp(const void *p1, const void *p2)
1719 {
1720 	int v = strcmp(DFRP(p1)->dfr_fstype, DFRP(p2)->dfr_fstype);
1721 
1722 	if (v != 0)
1723 		return (v);
1724 	else
1725 		return (DFRP(p1)->dfr_index - DFRP(p2)->dfr_index);
1726 }
1727 
1728 
1729 static void
1730 vfs_error(char *file, int status)
1731 {
1732 	if (status == VFS_TOOLONG)
1733 		errmsg(ERR_NOFLAGS, "a line in %s exceeds %d characters",
1734 		    file, MNT_LINE_MAX);
1735 	else if (status == VFS_TOOMANY)
1736 		errmsg(ERR_NOFLAGS, "a line in %s has too many fields", file);
1737 	else if (status == VFS_TOOFEW)
1738 		errmsg(ERR_NOFLAGS, "a line in %s has too few fields", file);
1739 	else
1740 		errmsg(ERR_NOFLAGS, "error while reading %s: %d", file, status);
1741 }
1742 
1743 
1744 /*
1745  * Try to determine the fstype for the specified block device.
1746  * Return in order of decreasing preference:
1747  *	file system type from vfstab
1748  *	file system type as specified by -F option
1749  *	default file system type
1750  */
1751 static char *
1752 find_fstype(char *special)
1753 {
1754 	struct vfstab	vtab;
1755 	FILE		*fp;
1756 	int		status;
1757 	char		*vfstab_file = VFS_TAB;
1758 
1759 	fp = xfopen(vfstab_file);
1760 	status = getvfsspec(fp, &vtab, special);
1761 	(void) fclose(fp);
1762 	if (status > 0)
1763 		vfs_error(vfstab_file, status);
1764 
1765 	if (status == 0) {
1766 		if (F_option && ! EQ(FSType, vtab.vfs_fstype))
1767 			errmsg(ERR_NOFLAGS,
1768 			"warning: %s is of type %s", special, vtab.vfs_fstype);
1769 		return (new_string(vtab.vfs_fstype));
1770 	}
1771 	else
1772 		return (F_option ? FSType : default_fstype(special));
1773 }
1774 
1775 /*
1776  * When this function returns, the following fields are filled for all
1777  * valid entries in the requests[] array:
1778  *		dfr_mte		(if the file system is mounted)
1779  *		dfr_fstype
1780  *		dfr_index
1781  *
1782  * The function returns the number of errors that occurred while building
1783  * the request list.
1784  */
1785 static int
1786 create_request_list(
1787 			int argc,
1788 			char *argv[],
1789 			struct df_request *requests_p[],
1790 			size_t *request_count)
1791 {
1792 	struct df_request	*requests;
1793 	struct df_request	*dfrp;
1794 	size_t			size;
1795 	size_t 			i;
1796 	size_t 			request_index = 0;
1797 	size_t			max_requests;
1798 	int			errors = 0;
1799 
1800 	/*
1801 	 * If no args, use the mounted file systems, otherwise use the
1802 	 * user-specified arguments.
1803 	 */
1804 	if (argc == 0) {
1805 		mtab_read_file();
1806 		max_requests = mount_table_entries;
1807 	} else
1808 		max_requests = argc;
1809 
1810 	size = max_requests * sizeof (struct df_request);
1811 	requests = xmalloc(size);
1812 	(void) memset(requests, 0, size);
1813 
1814 	if (argc == 0) {
1815 		/*
1816 		 * If -Z wasn't specified, we skip mounts in other
1817 		 * zones.  This obviously is a noop in a non-global
1818 		 * zone.
1819 		 */
1820 		boolean_t showall = (getzoneid() != GLOBAL_ZONEID) || Z_option;
1821 		struct zone_summary *zsp;
1822 
1823 		if (!showall) {
1824 			zsp = fs_get_zone_summaries();
1825 			if (zsp == NULL)
1826 				errmsg(ERR_FATAL,
1827 				    "unable to retrieve list of zones");
1828 		}
1829 
1830 		for (i = 0; i < mount_table_entries; i++) {
1831 			struct extmnttab *mtp = mount_table[i].mte_mount;
1832 
1833 			if (EQ(mtp->mnt_fstype, MNTTYPE_SWAP))
1834 				continue;
1835 
1836 			if (!showall) {
1837 				if (fs_mount_in_other_zone(zsp,
1838 				    mtp->mnt_mountp))
1839 					continue;
1840 			}
1841 			dfrp = &requests[request_index++];
1842 			dfrp->dfr_mte		= &mount_table[i];
1843 			dfrp->dfr_fstype	= mtp->mnt_fstype;
1844 			dfrp->dfr_index		= i;
1845 			dfrp->dfr_valid		= TRUE;
1846 		}
1847 	} else {
1848 		struct stat64 *arg_stat; /* array of stat structures	*/
1849 		bool_int *valid_stat;	/* which structures are valid	*/
1850 
1851 		arg_stat = xmalloc(argc * sizeof (struct stat64));
1852 		valid_stat = xmalloc(argc * sizeof (bool_int));
1853 
1854 		/*
1855 		 * Obtain stat64 information for each argument before
1856 		 * constructing the list of mounted file systems. By
1857 		 * touching all these places we force the automounter
1858 		 * to establish any mounts required to access the arguments,
1859 		 * so that the corresponding mount table entries will exist
1860 		 * when we look for them.
1861 		 * It is still possible that the automounter may timeout
1862 		 * mounts between the time we read the mount table and the
1863 		 * time we process the request. Even in that case, when
1864 		 * we issue the statvfs64(2) for the mount point, the file
1865 		 * system will be mounted again. The only problem will
1866 		 * occur if the automounter maps change in the meantime
1867 		 * and the mount point is eliminated.
1868 		 */
1869 		for (i = 0; i < argc; i++)
1870 			valid_stat[i] = (stat64(argv[i], &arg_stat[i]) == 0);
1871 
1872 		mtab_read_file();
1873 
1874 		for (i = 0; i < argc; i++) {
1875 			char *arg = argv[i];
1876 
1877 			dfrp = &requests[request_index];
1878 
1879 			dfrp->dfr_index = request_index;
1880 			dfrp->dfr_cmd_arg = arg;
1881 
1882 			if (valid_stat[i]) {
1883 				dfrp->dfr_fstype = arg_stat[i].st_fstype;
1884 				if (S_ISBLK(arg_stat[i].st_mode)) {
1885 					bdev_mount_entry(dfrp);
1886 					dfrp->dfr_valid = TRUE;
1887 				} else if (S_ISDIR(arg_stat[i].st_mode) ||
1888 				    S_ISREG(arg_stat[i].st_mode) ||
1889 				    S_ISFIFO(arg_stat[i].st_mode)) {
1890 					path_mount_entry(dfrp,
1891 					    arg_stat[i].st_dev);
1892 					if (! DFR_ISMOUNTEDFS(dfrp)) {
1893 						errors++;
1894 						continue;
1895 					}
1896 					dfrp->dfr_valid = TRUE;
1897 				}
1898 			} else {
1899 				resource_mount_entry(dfrp);
1900 				dfrp->dfr_valid = DFR_ISMOUNTEDFS(dfrp);
1901 			}
1902 
1903 			/*
1904 			 * If we haven't managed to verify that the request
1905 			 * is valid, we must have gotten a bad argument.
1906 			 */
1907 			if (!dfrp->dfr_valid) {
1908 				errmsg(ERR_NOFLAGS,
1909 				    "(%-10s) not a block device, directory or "
1910 				    "mounted resource", arg);
1911 				errors++;
1912 				continue;
1913 			}
1914 
1915 			/*
1916 			 * Determine the file system type.
1917 			 */
1918 			if (DFR_ISMOUNTEDFS(dfrp))
1919 				dfrp->dfr_fstype =
1920 				    dfrp->dfr_mte->mte_mount->mnt_fstype;
1921 			else
1922 				dfrp->dfr_fstype =
1923 				    find_fstype(dfrp->dfr_cmd_arg);
1924 
1925 			request_index++;
1926 		}
1927 	}
1928 	*requests_p = requests;
1929 	*request_count = request_index;
1930 	return (errors);
1931 }
1932 
1933 
1934 /*
1935  * Select the appropriate function and flags to use for output.
1936  * Notice that using both -e and -b options produces a different form of
1937  * output than either of those two options alone; this is the behavior of
1938  * the SVR4 df.
1939  */
1940 static struct df_output *
1941 select_output(void)
1942 {
1943 	static struct df_output dfo;
1944 
1945 	/*
1946 	 * The order of checking options follows the option precedence
1947 	 * rules as they are listed in the man page.
1948 	 */
1949 	if (use_scaling) { /* comes from the -h option */
1950 		dfo.dfo_func = k_output;
1951 		dfo.dfo_flags = DFO_HEADER + DFO_STATVFS;
1952 	} else if (V_option) {
1953 		dfo.dfo_func = V_output;
1954 		dfo.dfo_flags = DFO_NOFLAGS;
1955 	} else if (g_option) {
1956 		dfo.dfo_func = g_output;
1957 		dfo.dfo_flags = DFO_STATVFS;
1958 	} else if (k_option || P_option || v_option) {
1959 		dfo.dfo_func = k_output;
1960 		dfo.dfo_flags = DFO_HEADER + DFO_STATVFS;
1961 	} else if (t_option) {
1962 		dfo.dfo_func = t_output;
1963 		dfo.dfo_flags = DFO_STATVFS;
1964 	} else if (b_option && e_option) {
1965 		dfo.dfo_func = eb_output;
1966 		dfo.dfo_flags = DFO_STATVFS;
1967 	} else if (b_option) {
1968 		dfo.dfo_func = b_output;
1969 		dfo.dfo_flags = DFO_HEADER + DFO_STATVFS;
1970 	} else if (e_option) {
1971 		dfo.dfo_func = e_output;
1972 		dfo.dfo_flags = DFO_HEADER + DFO_STATVFS;
1973 	} else if (n_option) {
1974 		dfo.dfo_func = n_output;
1975 		dfo.dfo_flags = DFO_NOFLAGS;
1976 	} else {
1977 		dfo.dfo_func = default_output;
1978 		dfo.dfo_flags = DFO_STATVFS;
1979 	}
1980 	return (&dfo);
1981 }
1982 
1983 
1984 /*
1985  * The (argc,argv) pair contains all the non-option arguments
1986  */
1987 static void
1988 do_df(int argc, char *argv[])
1989 {
1990 	size_t			i;
1991 	struct df_request	*requests;		/* array of requests */
1992 	size_t			n_requests;
1993 	struct df_request	*dfrp;
1994 	int			errors;
1995 
1996 	errors = create_request_list(argc, argv, &requests, &n_requests);
1997 
1998 	if (n_requests == 0)
1999 		exit(errors);
2000 
2001 	/*
2002 	 * If we are going to run the FSType-specific df command,
2003 	 * rearrange the requests so that we can issue a single command
2004 	 * per file system type.
2005 	 */
2006 	if (o_option) {
2007 		size_t j;
2008 
2009 		/*
2010 		 * qsort is not a stable sorting method (i.e. requests of
2011 		 * the same file system type may be swapped, and hence appear
2012 		 * in the output in a different order from the one in which
2013 		 * they were listed in the command line). In order to force
2014 		 * stability, we use the dfr_index field which is unique
2015 		 * for each request.
2016 		 */
2017 		qsort(requests,
2018 		    n_requests, sizeof (struct df_request), df_reqcomp);
2019 		for (i = 0; i < n_requests; i = j) {
2020 			char *fstype = requests[i].dfr_fstype;
2021 
2022 			for (j = i+1; j < n_requests; j++)
2023 				if (! EQ(fstype, requests[j].dfr_fstype))
2024 					break;
2025 
2026 			/*
2027 			 * At this point, requests in the range [i,j) are
2028 			 * of the same type.
2029 			 *
2030 			 * If the -F option was used, and the user specified
2031 			 * arguments, the filesystem types must match
2032 			 *
2033 			 * XXX: the alternative of doing this check here is to
2034 			 * 	invoke prune_list, but then we have to
2035 			 *	modify this code to ignore invalid requests.
2036 			 */
2037 			if (F_option && ! EQ(fstype, FSType)) {
2038 				size_t k;
2039 
2040 				for (k = i; k < j; k++) {
2041 					dfrp = &requests[k];
2042 					if (dfrp->dfr_cmd_arg != NULL) {
2043 						errmsg(ERR_NOFLAGS,
2044 						    "Warning: %s mounted as a "
2045 						    "%s file system",
2046 						    dfrp->dfr_cmd_arg,
2047 						    dfrp->dfr_fstype);
2048 						errors++;
2049 					}
2050 				}
2051 			} else
2052 				errors += run_fs_specific_df(&requests[i], j-i);
2053 		}
2054 	} else {
2055 		size_t valid_requests;
2056 
2057 		/*
2058 		 * We have to prune the request list to avoid printing a header
2059 		 * if there are no valid requests
2060 		 */
2061 		errors += prune_list(requests, n_requests, &valid_requests);
2062 
2063 		if (valid_requests) {
2064 			struct df_output *dfop = select_output();
2065 
2066 			/* indicates if we already printed out a header line */
2067 			int printed_header = 0;
2068 
2069 			for (i = 0; i < n_requests; i++) {
2070 				dfrp = &requests[i];
2071 				if (! dfrp->dfr_valid)
2072 					continue;
2073 
2074 				/*
2075 				 * If we don't have a mount point,
2076 				 * this must be a block device.
2077 				 */
2078 				if (DFR_ISMOUNTEDFS(dfrp)) {
2079 					struct statvfs64 stvfs;
2080 
2081 					if ((dfop->dfo_flags & DFO_STATVFS) &&
2082 					    statvfs64(DFR_MOUNT_POINT(dfrp),
2083 					    &stvfs) == -1) {
2084 						errmsg(ERR_PERROR,
2085 						    "cannot statvfs %s:",
2086 						    DFR_MOUNT_POINT(dfrp));
2087 						errors++;
2088 						continue;
2089 					}
2090 					if ((!printed_header) &&
2091 					    (dfop->dfo_flags & DFO_HEADER)) {
2092 						print_header();
2093 						printed_header = 1;
2094 					}
2095 
2096 					(*dfop->dfo_func)(dfrp, &stvfs);
2097 				} else {
2098 					/*
2099 					 *  -h option only works for
2100 					 *  mounted filesystems
2101 					 */
2102 					if (use_scaling) {
2103 						errmsg(ERR_NOFLAGS,
2104 		"-h option incompatible with unmounted special device (%s)",
2105 						    dfrp->dfr_cmd_arg);
2106 						errors++;
2107 						continue;
2108 					}
2109 					errors += run_fs_specific_df(dfrp, 1);
2110 				}
2111 			}
2112 		}
2113 	}
2114 	exit(errors);
2115 }
2116 
2117 
2118 /*
2119  * The rest of this file implements the devnm command
2120  */
2121 
2122 static char *
2123 find_dev_name(char *file, dev_t dev)
2124 {
2125 	struct df_request dfreq;
2126 
2127 	dfreq.dfr_cmd_arg = file;
2128 	dfreq.dfr_fstype = 0;
2129 	dfreq.dfr_mte = NULL;
2130 	path_mount_entry(&dfreq, dev);
2131 	return (DFR_ISMOUNTEDFS(&dfreq) ? DFR_SPECIAL(&dfreq) : NULL);
2132 }
2133 
2134 
2135 static void
2136 do_devnm(int argc, char *argv[])
2137 {
2138 	int arg;
2139 	int errors = 0;
2140 	char *dev_name;
2141 
2142 	if (argc == 1)
2143 		errmsg(ERR_NONAME, "Usage: %s name ...", DEVNM_CMD);
2144 
2145 	mtab_read_file();
2146 
2147 	for (arg = 1; arg < argc; arg++) {
2148 		char *file = argv[arg];
2149 		struct stat64 st;
2150 
2151 		if (stat64(file, &st) == -1) {
2152 			errmsg(ERR_PERROR, "%s: ", file);
2153 			errors++;
2154 			continue;
2155 		}
2156 
2157 		if (! is_remote_fs(st.st_fstype) &&
2158 		    ! EQ(st.st_fstype, MNTTYPE_TMPFS) &&
2159 		    (dev_name = find_dev_name(file, st.st_dev)))
2160 			(void) printf("%s %s\n", dev_name, file);
2161 		else
2162 			errmsg(ERR_NOFLAGS,
2163 			    "%s not found", file);
2164 	}
2165 	exit(errors);
2166 	/* NOTREACHED */
2167 }
2168