2 * Copyright (c) 2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
15 * the documentation and/or other materials provided with the
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18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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34 * $DragonFly: src/sbin/hammer/cmd_softprune.c,v 1.7 2008/08/21 23:28:43 thomas Exp $
40 struct softprune *next;
43 struct hammer_ioc_prune prune;
48 static void hammer_softprune_scandir(struct softprune **basep,
49 struct hammer_ioc_prune *template,
51 static int hammer_softprune_scanmeta(int fd, struct softprune *scan,
53 static void hammer_meta_flushdelete(int fd, struct hammer_ioc_snapshot *dsnap);
54 static struct softprune *hammer_softprune_addentry(struct softprune **basep,
55 struct hammer_ioc_prune *template,
56 const char *dirpath, const char *denname,
58 const char *linkbuf, const char *tidptr);
59 static void hammer_softprune_addelm(struct softprune *scan, hammer_tid_t tid,
60 time_t ct, time_t mt);
61 static void hammer_softprune_finalize(struct softprune *scan);
62 static void softprune_usage(int code);
65 * prune <softlink-dir>
66 * prune-everything <filesystem>
69 hammer_cmd_softprune(char **av, int ac, int everything_opt)
71 struct hammer_ioc_prune template;
72 struct hammer_ioc_pseudofs_rw pfs;
73 struct softprune *base, *scan;
82 clrpfs(&pfs, NULL, -1);
85 * NOTE: To restrict to a single file XXX we have to set
86 * the localization the same (not yet implemented). Typically
87 * two passes would be needed, one using HAMMER_LOCALIZE_MISC
88 * and one using HAMMER_LOCALIZE_INODE.
91 bzero(&template, sizeof(template));
92 template.key_beg.localization = HAMMER_MIN_LOCALIZATION;
93 template.key_beg.obj_id = HAMMER_MIN_OBJID;
94 template.key_end.localization = HAMMER_MAX_LOCALIZATION;
95 template.key_end.obj_id = HAMMER_MAX_OBJID;
96 hammer_get_cycle(&template.key_end, NULL);
97 template.stat_oldest_tid = HAMMER_MAX_TID;
100 * For now just allow one directory
102 if (ac == 0 || ac > 1)
106 * Scan the softlink directory.
108 if (everything_opt) {
109 const char *dummylink = "";
110 scan = hammer_softprune_addentry(&base, &template,
112 dummylink, dummylink);
115 scan->prune.nelms = 0;
116 scan->prune.head.flags |= HAMMER_IOC_PRUNE_ALL;
118 hammer_softprune_scandir(&base, &template, *av);
120 const char *dummylink = "";
121 scan = hammer_softprune_addentry(&base, &template,
123 dummylink, dummylink);
126 scan->prune.nelms = 0;
133 * XXX future (need to store separate cycles for each filesystem)
136 errx(1, "Currently only one HAMMER filesystem may "
137 "be specified in the softlink scan");
142 for (scan = base; scan; scan = scan->next) {
144 * Open the filesystem for ioctl calls and extract the
147 fd = open(scan->filesystem, O_RDONLY);
149 warn("Unable to open %s", scan->filesystem);
154 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) < 0) {
155 warn("Filesystem %s is not HAMMER", scan->filesystem);
160 scan->prune_min = pfs.ondisk->prune_min;
163 * Incorporate meta-data snapshots into the pruning regimen.
164 * If pruning everything we delete the meta-data snapshots.
166 if (hammer_softprune_scanmeta(fd, scan, everything_opt) < 0) {
167 warn("Filesystem %s could not scan meta-data snaps",
175 * Finalize operations
177 hammer_softprune_finalize(scan);
179 printf("Prune %s: EVERYTHING\n",
182 printf("Prune %s: %d snapshots\n",
183 scan->filesystem, scan->prune.nelms);
184 if (scan->prune.nelms == 0 &&
185 (scan->prune.head.flags & HAMMER_IOC_PRUNE_ALL) == 0) {
186 fprintf(stderr, "No snapshots found\n");
190 printf("Prune %s: objspace %016jx:%04x %016jx:%04x "
193 (uintmax_t)scan->prune.key_beg.obj_id,
194 scan->prune.key_beg.localization,
195 (uintmax_t)scan->prune.key_end.obj_id,
196 scan->prune.key_end.localization,
198 printf("Prune %s: prune_min is %dd/%02d:%02d:%02d\n",
200 pfs.ondisk->prune_min / (24 * 60 * 60),
201 pfs.ondisk->prune_min / 60 / 60 % 24,
202 pfs.ondisk->prune_min / 60 % 60,
203 pfs.ondisk->prune_min % 60);
206 if (ioctl(fd, HAMMERIOC_PRUNE, &scan->prune) < 0) {
207 printf("Prune %s failed: %s\n",
208 scan->filesystem, strerror(errno));
210 } else if (scan->prune.head.flags & HAMMER_IOC_HEAD_INTR) {
211 printf("Prune %s interrupted by timer at "
214 (uintmax_t)scan->prune.key_cur.obj_id,
215 scan->prune.key_cur.localization);
217 hammer_set_cycle(&scan->prune.key_cur, 0);
221 hammer_reset_cycle();
222 printf("Prune %s succeeded\n", scan->filesystem);
224 printf("Pruned %jd/%jd records (%jd directory entries) "
226 (uintmax_t)scan->prune.stat_rawrecords,
227 (uintmax_t)scan->prune.stat_scanrecords,
228 (uintmax_t)scan->prune.stat_dirrecords,
229 (uintmax_t)scan->prune.stat_bytes
239 * Scan a directory for softlinks representing snapshots and build
240 * associated softprune structures.
242 * NOTE: Once a filesystem is completely converted to the meta-data
243 * snapshot mechanic we don't have to scan softlinks any more
244 * and can just use the meta-data. But for now we do both.
247 hammer_softprune_scandir(struct softprune **basep,
248 struct hammer_ioc_prune *template,
260 linkbuf = malloc(MAXPATHLEN);
262 if ((dir = opendir(dirname)) == NULL)
263 err(1, "Cannot open directory %s", dirname);
264 while ((den = readdir(dir)) != NULL) {
265 if (strcmp(den->d_name, ".") == 0)
267 if (strcmp(den->d_name, "..") == 0)
271 asprintf(&path, "%s/%s", dirname, den->d_name);
272 if (lstat(path, &st) < 0)
274 if (!S_ISLNK(st.st_mode))
276 if ((len = readlink(path, linkbuf, MAXPATHLEN - 1)) < 0)
279 if ((ptr = strrchr(linkbuf, '@')) &&
280 ptr > linkbuf && ptr[-1] == '@')
281 hammer_softprune_addentry(basep, template,
282 dirname, den->d_name, &st,
291 * Scan a directory for softlinks representing snapshots.
292 * Return 1 if the directory contains snapshots, otherwise 0.
295 hammer_softprune_testdir(const char *dirname)
297 struct softprune *base = NULL;
298 struct hammer_ioc_prune dummy_template;
300 bzero(&dummy_template, sizeof(dummy_template));
301 hammer_softprune_scandir(&base, &dummy_template, dirname);
309 * Scan the metadata snapshots for the filesystem and either delete them
310 * or add them to the pruning list.
314 hammer_softprune_scanmeta(int fd, struct softprune *scan, int delete_all)
316 struct hammer_ioc_version version;
317 struct hammer_ioc_snapshot snapshot;
318 struct hammer_ioc_snapshot dsnapshot;
319 hammer_snapshot_data_t snap;
323 * Stop if we can't get the version. Meta-data snapshots only
324 * exist for HAMMER version 3 or greater.
326 bzero(&version, sizeof(version));
327 if (ioctl(fd, HAMMERIOC_GET_VERSION, &version) < 0)
329 HammerVersion = version.cur_version;
330 if (version.cur_version < 3)
333 bzero(&snapshot, sizeof(snapshot));
334 bzero(&dsnapshot, sizeof(dsnapshot));
337 * Scan meta-data snapshots, either add them to the prune list or
338 * delete them. When deleting, just skip any entries which cannot
342 if (ioctl(fd, HAMMERIOC_GET_SNAPSHOT, &snapshot) < 0) {
343 printf("hammer prune: Unable to access "
344 "meta-data snaps: %s\n", strerror(errno));
347 while (snapshot.index < snapshot.count) {
348 snap = &snapshot.snaps[snapshot.index];
350 dsnapshot.snaps[dsnapshot.count++] = *snap;
351 if (dsnapshot.count == HAMMER_SNAPS_PER_IOCTL)
352 hammer_meta_flushdelete(fd, &dsnapshot);
354 ct = snap->ts / 1000000ULL;
355 hammer_softprune_addelm(scan, snap->tid,
360 if (snapshot.head.flags & HAMMER_IOC_SNAPSHOT_EOF)
365 hammer_meta_flushdelete(fd, &dsnapshot);
370 * Flush any entries built up in the deletion snapshot ioctl structure.
371 * Used during a prune-everything.
374 hammer_meta_flushdelete(int fd, struct hammer_ioc_snapshot *dsnap)
376 while (dsnap->index < dsnap->count) {
377 if (ioctl(fd, HAMMERIOC_DEL_SNAPSHOT, dsnap) < 0)
379 if (dsnap->head.error == 0)
388 * Add the softlink to the appropriate softprune structure, creating a new
393 hammer_softprune_addentry(struct softprune **basep,
394 struct hammer_ioc_prune *template,
395 const char *dirpath, const char *denname __unused,
397 const char *linkbuf, const char *tidptr)
399 struct softprune *scan;
404 * Calculate filesystem path.
406 if (linkbuf[0] == '/')
407 asprintf(&fspath, "%*.*s",
408 (int)(tidptr - linkbuf), (int)(tidptr - linkbuf),
411 asprintf(&fspath, "%s/%*.*s", dirpath,
412 (int)(tidptr - linkbuf), (int)(tidptr - linkbuf),
414 if (statfs(fspath, &fs) < 0) {
420 * Locate the filesystem in an existing softprune structure
422 for (scan = *basep; scan; scan = scan->next) {
423 if (bcmp(&fs.f_fsid, &scan->fs.f_fsid, sizeof(fs.f_fsid)) != 0)
425 if (strcmp(fs.f_mntonname, scan->fs.f_mntonname) != 0)
431 * Create a new softprune structure if necessasry
434 scan = malloc(sizeof(*scan));
435 bzero(scan, sizeof(*scan));
438 scan->filesystem = fspath;
439 scan->prune = *template;
441 scan->prune.elms = malloc(sizeof(struct hammer_ioc_prune_elm) *
448 hammer_softprune_addelm(scan,
449 (hammer_tid_t)strtoull(tidptr + 2, NULL, 0),
450 (st ? st->st_ctime : 0),
451 (st ? st->st_mtime : 0));
456 * Add the entry (unsorted). Just set the beg_tid, we will sort
457 * and set the remaining entries later.
459 * Always leave one entry free for our terminator.
462 hammer_softprune_addelm(struct softprune *scan, hammer_tid_t tid,
463 time_t ct, time_t mt)
465 struct hammer_ioc_prune_elm *elm;
467 if (scan->prune.nelms >= scan->maxelms - 1) {
468 scan->maxelms = (scan->maxelms * 3 / 2);
469 scan->prune.elms = realloc(scan->prune.elms,
470 sizeof(*elm) * scan->maxelms);
474 * NOTE: Temporarily store the snapshot timestamp in mod_tid.
475 * This will be cleaned up in the finalization phase.
477 elm = &scan->prune.elms[scan->prune.nelms];
489 * Finalize a softprune structure after scanning in its softlinks.
490 * Sort the elements, remove duplicates, and then fill in end_tid and
493 * The array must end up in descending order.
496 hammer_softprune_qsort_cmp(const void *arg1, const void *arg2)
498 const struct hammer_ioc_prune_elm *elm1 = arg1;
499 const struct hammer_ioc_prune_elm *elm2 = arg2;
501 if (elm1->beg_tid < elm2->beg_tid)
503 if (elm1->beg_tid > elm2->beg_tid)
509 hammer_softprune_finalize(struct softprune *scan)
511 struct hammer_ioc_prune_elm *elm;
517 * Don't do anything if there are no elements.
519 if (scan->prune.nelms == 0)
523 * Sort the elements in descending order, remove duplicates, and
524 * fill in any missing bits.
526 qsort(scan->prune.elms, scan->prune.nelms, sizeof(*elm),
527 hammer_softprune_qsort_cmp);
529 for (i = 0; i < scan->prune.nelms; ++i) {
530 elm = &scan->prune.elms[i];
533 * First (highest TID) (also last if only one element)
535 elm->end_tid = HAMMER_MAX_TID;
536 } else if (elm[0].beg_tid == elm[-1].beg_tid) {
541 if (i != scan->prune.nelms)
543 (scan->prune.nelms - i) * sizeof(*elm));
550 elm->end_tid = elm[-1].beg_tid;
555 * If a minimum retention time (in seconds) is configured for the
556 * PFS, remove any snapshots from the pruning list that are within
559 if (scan->prune_min) {
561 for (i = scan->prune.nelms - 1; i >= 0; --i) {
562 elm = &scan->prune.elms[i];
563 if (elm->mod_tid == 0)
565 delta = (long)(t - (time_t)elm->mod_tid);
566 if (delta < scan->prune_min)
571 printf("Prune %s: prune_min: Will not clean between "
572 "the teeth of the first %d snapshots\n",
573 scan->filesystem, i);
574 bcopy(&scan->prune.elms[i], &scan->prune.elms[0],
575 (scan->prune.nelms - i) * sizeof(scan->prune.elms[0]));
576 scan->prune.elms[0].end_tid = HAMMER_MAX_TID;
577 scan->prune.nelms -= i;
582 * Remove the first entry. This entry represents the prune from
583 * the most recent snapshot to current. We wish to retain the
584 * fine-grained history for this region.
586 if (scan->prune.nelms) {
587 bcopy(&scan->prune.elms[1], &scan->prune.elms[0],
588 (scan->prune.nelms - 1) * sizeof(scan->prune.elms[0]));
593 * Add a final element to prune everything from transaction id
594 * 0 to the lowest transaction id (aka last so far).
596 if (scan->prune.nelms) {
597 assert(scan->prune.nelms < scan->maxelms);
598 elm = &scan->prune.elms[scan->prune.nelms];
600 elm->end_tid = elm[-1].beg_tid;
605 * Adjust mod_tid to what the ioctl() expects.
607 for (i = 0; i < scan->prune.nelms; ++i) {
608 elm = &scan->prune.elms[i];
609 elm->mod_tid = elm->end_tid - elm->beg_tid;
610 printf("TID %016jx - %016jx\n",
611 (uintmax_t)elm->beg_tid, (uintmax_t)elm->end_tid);
617 softprune_usage(int code)
619 fprintf(stderr, "Badly formed prune command, use:\n");
620 fprintf(stderr, "hammer prune <softlink-dir>\n");
621 fprintf(stderr, "hammer prune-everything <filesystem>\n");