Add a feature and a sysctl (debug.ktr.testipicnt) to test inter-cpu
[dragonfly.git] / usr.bin / du / du.c
1 /*
2  * Copyright (c) 1989, 1993, 1994
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * This code is derived from software contributed to Berkeley by
6  * Chris Newcomb.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. All advertising materials mentioning features or use of this software
17  *    must display the following acknowledgement:
18  *      This product includes software developed by the University of
19  *      California, Berkeley and its contributors.
20  * 4. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California.  All rights reserved.
37  * @(#)du.c     8.5 (Berkeley) 5/4/95
38  * $FreeBSD: src/usr.bin/du/du.c,v 1.17.2.4 2002/12/12 16:29:39 trhodes Exp $
39  * $DragonFly: src/usr.bin/du/du.c,v 1.8 2005/09/01 22:19:26 liamfoy Exp $
40  */
41
42 #include <sys/param.h>
43 #include <sys/queue.h>
44 #include <sys/stat.h>
45
46 #include <err.h>
47 #include <errno.h>
48 #include <fnmatch.h>
49 #include <fts.h>
50 #include <math.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <sysexits.h>
55 #include <unistd.h>
56
57 #define KILO_SZ(n) (n)
58 #define MEGA_SZ(n) ((n) * (n))
59 #define GIGA_SZ(n) ((n) * (n) * (n))
60 #define TERA_SZ(n) ((n) * (n) * (n) * (n))
61 #define PETA_SZ(n) ((n) * (n) * (n) * (n) * (n))
62
63 #define KILO_2_SZ (KILO_SZ(1024ULL))
64 #define MEGA_2_SZ (MEGA_SZ(1024ULL))
65 #define GIGA_2_SZ (GIGA_SZ(1024ULL))
66 #define TERA_2_SZ (TERA_SZ(1024ULL))
67 #define PETA_2_SZ (PETA_SZ(1024ULL))
68
69 #define KILO_SI_SZ (KILO_SZ(1000ULL))
70 #define MEGA_SI_SZ (MEGA_SZ(1000ULL))
71 #define GIGA_SI_SZ (GIGA_SZ(1000ULL))
72 #define TERA_SI_SZ (TERA_SZ(1000ULL))
73 #define PETA_SI_SZ (PETA_SZ(1000ULL))
74
75 #define HASHSIZE        256             /* power of 2 only */
76 #define HASHMASK        (HASHSIZE - 1)
77
78 unsigned long long vals_si [] = {1, KILO_SI_SZ, MEGA_SI_SZ, GIGA_SI_SZ, TERA_SI_SZ, PETA_SI_SZ};
79 unsigned long long vals_base2[] = {1, KILO_2_SZ, MEGA_2_SZ, GIGA_2_SZ, TERA_2_SZ, PETA_2_SZ};
80 unsigned long long *valp;
81
82 typedef enum { NONE, KILO, MEGA, GIGA, TERA, PETA, UNIT_MAX } unit_t;
83
84 int unitp [] = { NONE, KILO, MEGA, GIGA, TERA, PETA };
85
86 SLIST_HEAD(ignhead, ignentry) ignores;
87 struct ignentry {
88         char                    *mask;
89         SLIST_ENTRY(ignentry)   next;
90 };
91
92 static int      linkchk(FTSENT *);
93 static void     usage(void);
94 void            prthumanval(double);
95 unit_t          unit_adjust(double *);
96 void            ignoreadd(const char *);
97 void            ignoreclean(void);
98 int             ignorep(FTSENT *);
99
100 static char period[] = ".";
101
102 int
103 main(int argc, char **argv)
104 {
105         FTS             *fts;
106         FTSENT          *p;
107         long            blocksize, savednumber = 0;
108         int             ftsoptions;
109         int             listall;
110         int             depth;
111         int             Hflag, Lflag, Pflag, aflag, sflag, dflag, cflag, hflag, ch, notused, rval;
112         char            **save;
113
114         Hflag = Lflag = Pflag = aflag = sflag = dflag = cflag = hflag = 0;
115         
116         save = argv;
117         ftsoptions = 0;
118         depth = INT_MAX;
119         SLIST_INIT(&ignores);
120         
121         while ((ch = getopt(argc, argv, "HI:LPasd:chkrx")) != -1)
122                 switch (ch) {
123                         case 'H':
124                                 Hflag = 1;
125                                 break;
126                         case 'I':
127                                 ignoreadd(optarg);
128                                 break;
129                         case 'L':
130                                 if (Pflag)
131                                         usage();
132                                 Lflag = 1;
133                                 break;
134                         case 'P':
135                                 if (Lflag)
136                                         usage();
137                                 Pflag = 1;
138                                 break;
139                         case 'a':
140                                 aflag = 1;
141                                 break;
142                         case 's':
143                                 sflag = 1;
144                                 break;
145                         case 'd':
146                                 dflag = 1;
147                                 errno = 0;
148                                 depth = atoi(optarg);
149                                 if (errno == ERANGE || depth < 0) {
150                                         warnx("invalid argument to option d: %s", optarg);
151                                         usage();
152                                 }
153                                 break;
154                         case 'c':
155                                 cflag = 1;
156                                 break;
157                         case 'h':
158                                 putenv("BLOCKSIZE=512");
159                                 hflag = 1;
160                                 valp = vals_base2;
161                                 break;
162                         case 'k':
163                                 hflag = 0;
164                                 putenv("BLOCKSIZE=1024");
165                                 break;
166                         case 'r':                /* Compatibility. */
167                                 break;
168                         case 'x':
169                                 ftsoptions |= FTS_XDEV;
170                                 break;
171                         case '?':
172                         default:
173                                 usage();
174                 }
175
176         argc -= optind;
177         argv += optind;
178
179         /*
180          * XXX
181          * Because of the way that fts(3) works, logical walks will not count
182          * the blocks actually used by symbolic links.  We rationalize this by
183          * noting that users computing logical sizes are likely to do logical
184          * copies, so not counting the links is correct.  The real reason is
185          * that we'd have to re-implement the kernel's symbolic link traversing
186          * algorithm to get this right.  If, for example, you have relative
187          * symbolic links referencing other relative symbolic links, it gets
188          * very nasty, very fast.  The bottom line is that it's documented in
189          * the man page, so it's a feature.
190          */
191
192         if (Hflag + Lflag + Pflag > 1)
193                 usage();
194
195         if (Hflag + Lflag + Pflag == 0)
196                 Pflag = 1;                      /* -P (physical) is default */
197
198         if (Hflag)
199                 ftsoptions |= FTS_COMFOLLOW;
200
201         if (Lflag)
202                 ftsoptions |= FTS_LOGICAL;
203
204         if (Pflag)
205                 ftsoptions |= FTS_PHYSICAL;
206
207         listall = 0;
208
209         if (aflag) {
210                 if (sflag || dflag)
211                         usage();
212                 listall = 1;
213         } else if (sflag) {
214                 if (dflag)
215                         usage();
216                 depth = 0;
217         }
218
219         if (!*argv) {
220                 argv = save;
221                 argv[0] = period;
222                 argv[1] = NULL;
223         }
224
225         (void) getbsize(&notused, &blocksize);
226         blocksize /= 512;
227
228         rval = 0;
229         
230         if ((fts = fts_open(argv, ftsoptions, NULL)) == NULL)
231                 err(1, "fts_open");
232
233         while ((p = fts_read(fts)) != NULL) {
234                 switch (p->fts_info) {
235                         case FTS_D:                     /* Ignore. */
236                                 if (ignorep(p))
237                                         fts_set(fts, p, FTS_SKIP);
238                                 break;
239                         case FTS_DP:
240                                 if (ignorep(p))
241                                         break;
242
243                                 p->fts_parent->fts_number +=
244                                     p->fts_number += p->fts_statp->st_blocks;
245                                 
246                                 if (p->fts_level <= depth) {
247                                         if (hflag) {
248                                                 (void) prthumanval(howmany(p->fts_number, blocksize));
249                                                 (void) printf("\t%s\n", p->fts_path);
250                                         } else {
251                                         (void) printf("%ld\t%s\n",
252                                             howmany(p->fts_number, blocksize),
253                                             p->fts_path);
254                                         }
255                                 }
256                                 break;
257                         case FTS_DC:                    /* Ignore. */
258                                 break;
259                         case FTS_DNR:                   /* Warn, continue. */
260                         case FTS_ERR:
261                         case FTS_NS:
262                                 warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
263                                 rval = 1;
264                                 break;
265                         default:
266                                 if (ignorep(p))
267                                         break;
268
269                                 if (p->fts_statp->st_nlink > 1 && linkchk(p))
270                                         break;
271                                 
272                                 if (listall || p->fts_level == 0) {
273                                         if (hflag) {
274                                                 (void) prthumanval(howmany(p->fts_statp->st_blocks,
275                                                         blocksize));
276                                                 (void) printf("\t%s\n", p->fts_path);
277                                         } else {
278                                                 (void) printf("%qd\t%s\n",
279                                                         howmany(p->fts_statp->st_blocks, blocksize),
280                                                         p->fts_path);
281                                         }
282                                 }
283
284                                 p->fts_parent->fts_number += p->fts_statp->st_blocks;
285                 }
286                 savednumber = p->fts_parent->fts_number;
287         }
288
289         if (errno)
290                 err(1, "fts_read");
291
292         if (cflag) {
293                 if (hflag) {
294                         (void) prthumanval(howmany(savednumber, blocksize));
295                         (void) printf("\ttotal\n");
296                 } else {
297                         (void) printf("%ld\ttotal\n", howmany(savednumber, blocksize));
298                 }
299         }
300
301         ignoreclean();
302         exit(rval);
303 }
304
305 static int
306 linkchk(FTSENT *p)
307 {
308         struct links_entry {
309                 struct links_entry *next;
310                 struct links_entry *previous;
311                 int             links;
312                 dev_t           dev;
313                 ino_t           ino;
314         };
315
316         static const size_t links_hash_initial_size = 8192;
317         static struct links_entry **buckets;
318         static struct links_entry *free_list;
319         static size_t number_buckets;
320         static unsigned long number_entries;
321         static char stop_allocating;
322         struct links_entry *le, **new_buckets;
323         struct stat *st;
324         size_t i, new_size;
325         int hash;
326
327         st = p->fts_statp;
328
329         /* If necessary, initialize the hash table. */
330         if (buckets == NULL) {
331                 number_buckets = links_hash_initial_size;
332                 buckets = malloc(number_buckets * sizeof(buckets[0]));
333                 if (buckets == NULL)
334                         errx(1, "No memory for hardlink detection");
335                 for (i = 0; i < number_buckets; i++)
336                         buckets[i] = NULL;
337         }
338
339         /* If the hash table is getting too full, enlarge it. */
340         if (number_entries > number_buckets * 10 && !stop_allocating) {
341                 new_size = number_buckets * 2;
342                 new_buckets = malloc(new_size * sizeof(struct links_entry *));
343
344                 /* Try releasing the free list to see if that helps. */
345                 if (new_buckets == NULL && free_list != NULL) {
346                         while (free_list != NULL) {
347                                 le = free_list;
348                                 free_list = le->next;
349                                 free(le);
350                         }
351                         new_buckets = malloc(new_size * sizeof(new_buckets[0]));
352                 }
353
354                 if (new_buckets == NULL) {
355                         stop_allocating = 1;
356                         warnx("No more memory for tracking hard links");
357                 } else {
358                         memset(new_buckets, 0, new_size * sizeof(struct links_entry *));
359                         for (i = 0; i < number_buckets; i++) {
360                                 while (buckets[i] != NULL) {
361                                         /* Remove entry from old bucket. */
362                                         le = buckets[i];
363                                         buckets[i] = le->next;
364         
365                                         /* Add entry to new bucket. */
366                                         hash = (le->dev ^ le->ino) % new_size;
367         
368                                         if (new_buckets[hash] != NULL)
369                                                 new_buckets[hash]->previous = le;
370                                         le->next = new_buckets[hash];
371                                         le->previous = NULL;
372                                         new_buckets[hash] = le;
373                                 }
374                         }
375                         free(buckets);
376                         buckets = new_buckets;
377                         number_buckets = new_size;
378                 }
379         }
380
381         /* Try to locate this entry in the hash table. */
382         hash = ( st->st_dev ^ st->st_ino ) % number_buckets;
383         for (le = buckets[hash]; le != NULL; le = le->next) {
384                 if (le->dev == st->st_dev && le->ino == st->st_ino) {
385                         /*
386                          * Save memory by releasing an entry when we've seen
387                          * all of it's links.
388                          */
389                         if (--le->links <= 0) {
390                                 if (le->previous != NULL)
391                                         le->previous->next = le->next;
392                                 if (le->next != NULL)
393                                         le->next->previous = le->previous;
394                                 if (buckets[hash] == le)
395                                         buckets[hash] = le->next;
396                                 number_entries--;
397                                 /* Recycle this node through the free list */
398                                 if (stop_allocating) {
399                                         free(le);
400                                 } else {
401                                         le->next = free_list;
402                                         free_list = le;
403                                 }
404                         }
405                         return (1);
406                 }
407         }
408
409         if (stop_allocating)
410                 return (0);
411
412         /* Add this entry to the links cache. */
413         if (free_list != NULL) {
414                 /* Pull a node from the free list if we can. */
415                 le = free_list;
416                 free_list = le->next;
417         } else
418                 /* Malloc one if we have to. */
419                 le = malloc(sizeof(struct links_entry));
420         if (le == NULL) {
421                 stop_allocating = 1;
422                 warnx("No more memory for tracking hard links");
423                 return (0);
424         }
425         le->dev = st->st_dev;
426         le->ino = st->st_ino;
427         le->links = st->st_nlink - 1;
428         number_entries++;
429         le->next = buckets[hash];
430         le->previous = NULL;
431         if (buckets[hash] != NULL)
432                 buckets[hash]->previous = le;
433         buckets[hash] = le;
434         return (0);
435 }
436
437 /*
438  * Output in "human-readable" format.  Uses 3 digits max and puts
439  * unit suffixes at the end.  Makes output compact and easy to read,
440  * especially on huge disks.
441  *
442  */
443 unit_t
444 unit_adjust(double *val)
445 {
446         double abval;
447         unit_t unit;
448         unsigned int unit_sz;
449
450         abval = fabs(*val);
451
452         unit_sz = abval ? ilogb(abval) / 10 : 0;
453
454         if (unit_sz >= UNIT_MAX) {
455                 unit = NONE;
456         } else {
457                 unit = unitp[unit_sz];
458                 *val /= (double)valp[unit_sz];
459         }
460
461         return (unit);
462 }
463
464 void
465 prthumanval(double bytes)
466 {
467         unit_t unit;
468
469         bytes *= 512;
470         unit = unit_adjust(&bytes);
471
472         if (bytes == 0)
473                 (void)printf("  0B");
474         else if (bytes > 10)
475                 (void)printf("%3.0f%c", bytes, "BKMGTPE"[unit]);
476         else
477                 (void)printf("%3.1f%c", bytes, "BKMGTPE"[unit]);
478 }
479
480 static void
481 usage(void)
482 {
483         (void)fprintf(stderr,
484                 "usage: du [-H | -L | -P] [-a | -s | -d depth] [-c] [-h | -k] [-x] [-I mask] [file ...]\n");
485         exit(EX_USAGE);
486 }
487
488 void
489 ignoreadd(const char *mask)
490 {
491         struct ignentry *ign;
492
493         ign = calloc(1, sizeof(*ign));
494         if (ign == NULL)
495                 errx(1, "cannot allocate memory");
496         ign->mask = strdup(mask);
497         if (ign->mask == NULL)
498                 errx(1, "cannot allocate memory");
499         SLIST_INSERT_HEAD(&ignores, ign, next);
500 }
501
502 void
503 ignoreclean(void)
504 {
505         struct ignentry *ign;
506         
507         while (!SLIST_EMPTY(&ignores)) {
508                 ign = SLIST_FIRST(&ignores);
509                 SLIST_REMOVE_HEAD(&ignores, next);
510                 free(ign->mask);
511                 free(ign);
512         }
513 }
514
515 int
516 ignorep(FTSENT *ent)
517 {
518         struct ignentry *ign;
519
520         SLIST_FOREACH(ign, &ignores, next)
521                 if (fnmatch(ign->mask, ent->fts_name, 0) != FNM_NOMATCH)
522                         return 1;
523         return 0;
524 }