Commit | Line | Data |
---|---|---|
6aae748e | 1 | /* |
0f78b815 WD |
2 | * Routines to support hard-linking. |
3 | * | |
4 | * Copyright (C) 1996 Andrew Tridgell | |
5 | * Copyright (C) 1996 Paul Mackerras | |
6 | * Copyright (C) 2002 Martin Pool <mbp@samba.org> | |
ba2133d6 | 7 | * Copyright (C) 2004-2007 Wayne Davison |
0f78b815 WD |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
8e41b68e WD |
10 | * it under the terms of the GNU General Public License as published by |
11 | * the Free Software Foundation; either version 3 of the License, or | |
12 | * (at your option) any later version. | |
0f78b815 WD |
13 | * |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
e7c67065 | 19 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 20 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 | 21 | */ |
dc5ddbcc AT |
22 | |
23 | #include "rsync.h" | |
24 | ||
9a52223b | 25 | extern int verbose; |
82ad07c4 | 26 | extern int dry_run; |
d4d6646a WD |
27 | extern int am_sender; |
28 | extern int inc_recurse; | |
841d9436 | 29 | extern int do_xfers; |
541b23d1 | 30 | extern int link_dest; |
1c3344a1 | 31 | extern int preserve_acls; |
417c99f6 | 32 | extern int make_backups; |
c905bf37 | 33 | extern int protocol_version; |
47c11975 | 34 | extern int remove_source_files; |
20f90d5e | 35 | extern int stdout_format_has_i; |
aadc84d3 | 36 | extern int maybe_ATTRS_REPORT; |
541b23d1 | 37 | extern char *basis_dir[]; |
3ac830b9 | 38 | extern struct file_list *cur_flist; |
332cf6df WD |
39 | #ifdef ICONV_OPTION |
40 | extern int ic_ndx; | |
41 | #endif | |
dc5ddbcc | 42 | |
4f5b0756 | 43 | #ifdef SUPPORT_HARD_LINKS |
9f2e3c3f | 44 | |
c905bf37 WD |
45 | /* Starting with protocol 30, we use a simple hashtable on the sending side |
46 | * for hashing the st_dev and st_ino info. The receiving side gets told | |
47 | * (via flags and a "group index") which items are hard-linked together, so | |
d4d6646a WD |
48 | * we can avoid the pool of dev+inode data. For incremental recursion mode, |
49 | * the receiver will use a ndx hash to remember old pathnames. */ | |
c905bf37 | 50 | |
d4d6646a WD |
51 | static struct hashtable *dev_tbl; |
52 | ||
53 | static struct hashtable *prior_hlinks; | |
54 | ||
55 | static struct file_list *hlink_flist; | |
9f2e3c3f | 56 | |
aadc84d3 WD |
57 | void init_hard_links(void) |
58 | { | |
d4d6646a WD |
59 | if (am_sender || protocol_version < 30) |
60 | dev_tbl = hashtable_create(16, SIZEOF_INT64 == 8); | |
61 | else if (inc_recurse) | |
62 | prior_hlinks = hashtable_create(1024, 0); | |
c905bf37 WD |
63 | } |
64 | ||
62606570 | 65 | struct ht_int64_node *idev_find(int64 dev, int64 ino) |
c905bf37 | 66 | { |
62606570 WD |
67 | static struct ht_int64_node *dev_node = NULL; |
68 | struct hashtable *tbl; | |
c905bf37 WD |
69 | |
70 | if (!dev_node || dev_node->key != dev) { | |
71 | /* We keep a separate hash table of inodes for every device. */ | |
62606570 | 72 | dev_node = hashtable_find(dev_tbl, dev, 1); |
c905bf37 | 73 | if (!(tbl = dev_node->data)) |
62606570 | 74 | tbl = dev_node->data = hashtable_create(512, SIZEOF_INT64 == 8); |
c905bf37 WD |
75 | } else |
76 | tbl = dev_node->data; | |
77 | ||
62606570 | 78 | return hashtable_find(tbl, ino, 1); |
c905bf37 WD |
79 | } |
80 | ||
81 | void idev_destroy(void) | |
82 | { | |
83 | int i; | |
84 | ||
85 | for (i = 0; i < dev_tbl->size; i++) { | |
62606570 WD |
86 | struct ht_int32_node *node = HT_NODE(dev_tbl, dev_tbl->nodes, i); |
87 | if (node->data) | |
88 | hashtable_destroy(node->data); | |
c905bf37 WD |
89 | } |
90 | ||
62606570 | 91 | hashtable_destroy(dev_tbl); |
c905bf37 WD |
92 | } |
93 | ||
c905bf37 | 94 | static int hlink_compare_gnum(int *int1, int *int2) |
1d5cda22 | 95 | { |
d4d6646a WD |
96 | struct file_struct *f1 = hlink_flist->sorted[*int1]; |
97 | struct file_struct *f2 = hlink_flist->sorted[*int2]; | |
719985cb WD |
98 | int32 gnum1 = F_HL_GNUM(f1); |
99 | int32 gnum2 = F_HL_GNUM(f2); | |
1d5cda22 | 100 | |
c905bf37 WD |
101 | if (gnum1 != gnum2) |
102 | return gnum1 > gnum2 ? 1 : -1; | |
9935066b | 103 | |
c905bf37 WD |
104 | return *int1 > *int2 ? 1 : -1; |
105 | } | |
9935066b | 106 | |
c905bf37 WD |
107 | static void match_gnums(int32 *ndx_list, int ndx_count) |
108 | { | |
109 | int32 from, prev; | |
110 | struct file_struct *file, *file_next; | |
d4d6646a | 111 | struct ht_int32_node *node = NULL; |
719985cb | 112 | int32 gnum, gnum_next; |
c905bf37 WD |
113 | |
114 | qsort(ndx_list, ndx_count, sizeof ndx_list[0], | |
115 | (int (*)()) hlink_compare_gnum); | |
116 | ||
117 | for (from = 0; from < ndx_count; from++) { | |
d4d6646a WD |
118 | file = hlink_flist->sorted[ndx_list[from]]; |
119 | gnum = F_HL_GNUM(file); | |
120 | if (inc_recurse) { | |
121 | node = hashtable_find(prior_hlinks, gnum, 1); | |
122 | if (!node->data) { | |
123 | node->data = new_array0(char, 5); | |
124 | assert(gnum >= hlink_flist->ndx_start); | |
125 | } | |
126 | } | |
127 | if (gnum >= hlink_flist->ndx_start) { | |
128 | file->flags |= FLAG_HLINK_FIRST; | |
129 | prev = -1; | |
130 | } else if (CVAL(node->data, 0) == 0) { | |
131 | struct file_list *flist; | |
132 | prev = IVAL(node->data, 1); | |
133 | flist = flist_for_ndx(prev); | |
134 | assert(flist != NULL); | |
135 | file_next = flist->files[prev - flist->ndx_start]; | |
136 | file_next->flags &= ~FLAG_HLINK_LAST; | |
137 | } else | |
138 | prev = -1; | |
139 | for ( ; from < ndx_count-1; file = file_next, gnum = gnum_next, from++) { /*SHARED ITERATOR*/ | |
140 | file_next = hlink_flist->sorted[ndx_list[from+1]]; | |
c905bf37 WD |
141 | gnum_next = F_HL_GNUM(file_next); |
142 | if (gnum != gnum_next) | |
143 | break; | |
c905bf37 | 144 | F_HL_PREV(file) = prev; |
332cf6df WD |
145 | /* The linked list must use raw ndx values. */ |
146 | #ifdef ICONV_OPTION | |
147 | if (ic_ndx) | |
148 | prev = F_NDX(file); | |
149 | else | |
150 | #endif | |
d4d6646a | 151 | prev = ndx_list[from] + hlink_flist->ndx_start; |
c905bf37 | 152 | } |
d4d6646a WD |
153 | if (prev < 0 && !inc_recurse) { |
154 | file->flags &= ~(FLAG_HLINKED | FLAG_HLINK_FIRST); | |
155 | continue; | |
156 | } | |
157 | ||
158 | file->flags |= FLAG_HLINK_LAST; | |
159 | F_HL_PREV(file) = prev; | |
160 | if (inc_recurse && CVAL(node->data, 0) == 0) { | |
161 | #ifdef ICONV_OPTION | |
162 | if (ic_ndx) | |
163 | prev = F_NDX(file); | |
164 | else | |
165 | #endif | |
166 | prev = ndx_list[from] + hlink_flist->ndx_start; | |
167 | SIVAL(node->data, 1, prev); | |
c905bf37 WD |
168 | } |
169 | } | |
170 | } | |
171 | ||
172 | /* Analyze the hard-links in the file-list by creating a list of all the | |
173 | * items that have hlink data, sorting them, and matching up identical | |
174 | * values into clusters. These will be a single linked list from last | |
175 | * to first when we're done. */ | |
d4d6646a | 176 | void match_hard_links(struct file_list *flist) |
c905bf37 WD |
177 | { |
178 | int i, ndx_count = 0; | |
179 | int32 *ndx_list; | |
180 | ||
d4d6646a | 181 | if (!(ndx_list = new_array(int32, flist->used))) |
c905bf37 WD |
182 | out_of_memory("match_hard_links"); |
183 | ||
d4d6646a WD |
184 | for (i = 0; i < flist->used; i++) { |
185 | if (F_IS_HLINKED(flist->sorted[i])) | |
c905bf37 WD |
186 | ndx_list[ndx_count++] = i; |
187 | } | |
1d5cda22 | 188 | |
d4d6646a WD |
189 | hlink_flist = flist; |
190 | ||
007996b4 WD |
191 | if (ndx_count) |
192 | match_gnums(ndx_list, ndx_count); | |
193 | ||
aadc84d3 | 194 | free(ndx_list); |
007996b4 WD |
195 | if (protocol_version < 30) |
196 | idev_destroy(); | |
dc5ddbcc AT |
197 | } |
198 | ||
3cd5301f | 199 | static int maybe_hard_link(struct file_struct *file, int ndx, |
1c3344a1 | 200 | const char *fname, int statret, statx *sxp, |
aadc84d3 WD |
201 | const char *oldname, STRUCT_STAT *old_stp, |
202 | const char *realname, int itemizing, enum logcode code) | |
3cd5301f WD |
203 | { |
204 | if (statret == 0) { | |
1c3344a1 WD |
205 | if (sxp->st.st_dev == old_stp->st_dev |
206 | && sxp->st.st_ino == old_stp->st_ino) { | |
3cd5301f | 207 | if (itemizing) { |
1c3344a1 | 208 | itemize(fname, file, ndx, statret, sxp, |
3cd5301f WD |
209 | ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS, |
210 | 0, ""); | |
211 | } | |
aadc84d3 WD |
212 | if (verbose > 1 && maybe_ATTRS_REPORT) |
213 | rprintf(FCLIENT, "%s is uptodate\n", fname); | |
214 | file->flags |= FLAG_HLINK_DONE; | |
3cd5301f WD |
215 | return 0; |
216 | } | |
3ac830b9 | 217 | if (make_backups > 0) { |
3cd5301f WD |
218 | if (!make_backup(fname)) |
219 | return -1; | |
220 | } else if (robust_unlink(fname)) { | |
221 | rsyserr(FERROR, errno, "unlink %s failed", | |
222 | full_fname(fname)); | |
223 | return -1; | |
224 | } | |
225 | } | |
aadc84d3 WD |
226 | |
227 | if (hard_link_one(file, fname, oldname, 0)) { | |
228 | if (itemizing) { | |
1c3344a1 | 229 | itemize(fname, file, ndx, statret, sxp, |
aadc84d3 WD |
230 | ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS, 0, |
231 | realname); | |
232 | } | |
233 | if (code != FNONE && verbose) | |
234 | rprintf(code, "%s => %s\n", fname, realname); | |
235 | return 0; | |
236 | } | |
237 | return -1; | |
3cd5301f | 238 | } |
3cd5301f | 239 | |
d4d6646a WD |
240 | /* Figure out if a prior entry is still there or if we just have a |
241 | * cached name for it. Never called with a FLAG_HLINK_FIRST entry. */ | |
242 | static char *check_prior(int prev_ndx, int gnum) | |
243 | { | |
244 | struct file_list *flist = flist_for_ndx(prev_ndx); | |
245 | struct ht_int32_node *node; | |
246 | ||
247 | if (flist) { | |
248 | hlink_flist = flist; | |
249 | return NULL; | |
250 | } | |
251 | ||
252 | node = hashtable_find(prior_hlinks, gnum, 0); | |
253 | assert(node != NULL && node->data); | |
254 | assert(CVAL(node->data, 0) != 0); | |
255 | return node->data; | |
256 | } | |
257 | ||
aadc84d3 WD |
258 | /* Only called if FLAG_HLINKED is set and FLAG_HLINK_FIRST is not. Returns: |
259 | * 0 = process the file, 1 = skip the file, -1 = error occurred. */ | |
a2ebbffc | 260 | int hard_link_check(struct file_struct *file, int ndx, const char *fname, |
1c3344a1 | 261 | int statret, statx *sxp, int itemizing, |
aadc84d3 | 262 | enum logcode code) |
d38fc305 | 263 | { |
aadc84d3 | 264 | STRUCT_STAT prev_st; |
d4d6646a WD |
265 | char namebuf[MAXPATHLEN], altbuf[MAXPATHLEN]; |
266 | char *realname, *prev_name; | |
267 | int gnum = F_HL_GNUM(file); | |
268 | int prev_ndx = F_HL_PREV(file); | |
269 | ||
270 | prev_name = realname = check_prior(prev_ndx, gnum); | |
271 | ||
272 | if (!prev_name) { | |
273 | struct file_struct *prev_file = hlink_flist->files[prev_ndx - hlink_flist->ndx_start]; | |
274 | ||
275 | /* Is the previous link is not complete yet? */ | |
276 | if (!(prev_file->flags & FLAG_HLINK_DONE)) { | |
277 | /* Is the previous link being transferred? */ | |
278 | if (prev_file->flags & FLAG_FILE_SENT) { | |
279 | /* Add ourselves to the list of files that will be | |
280 | * updated when the transfer completes, and mark | |
281 | * ourself as waiting for the transfer. */ | |
282 | F_HL_PREV(file) = F_HL_PREV(prev_file); | |
283 | F_HL_PREV(prev_file) = ndx; | |
284 | file->flags |= FLAG_FILE_SENT; | |
285 | cur_flist->in_progress++; | |
286 | return 1; | |
287 | } | |
288 | return 0; | |
6cbde57d | 289 | } |
aadc84d3 | 290 | |
d4d6646a WD |
291 | /* There is a finished file to link with! */ |
292 | if (!(prev_file->flags & FLAG_HLINK_FIRST)) { | |
293 | /* The previous previous will be marked with FIRST. */ | |
294 | prev_ndx = F_HL_PREV(prev_file); | |
295 | prev_name = realname = check_prior(prev_ndx, gnum); | |
296 | /* Update our previous pointer to point to the first. */ | |
297 | F_HL_PREV(file) = prev_ndx; | |
298 | } | |
aadc84d3 | 299 | } |
d4d6646a WD |
300 | if (!prev_name) { |
301 | struct file_struct *prev_file = hlink_flist->files[prev_ndx - hlink_flist->ndx_start]; | |
302 | int alt_dest = F_HL_PREV(prev_file); /* alternate value when DONE && FIRST */ | |
303 | ||
304 | if (alt_dest >= 0 && dry_run) { | |
305 | pathjoin(namebuf, MAXPATHLEN, basis_dir[alt_dest], | |
306 | f_name(prev_file, NULL)); | |
307 | prev_name = namebuf; | |
308 | realname = f_name(prev_file, altbuf); | |
309 | } else { | |
310 | prev_name = f_name(prev_file, namebuf); | |
311 | realname = prev_name; | |
312 | } | |
aadc84d3 WD |
313 | } |
314 | ||
315 | if (link_stat(prev_name, &prev_st, 0) < 0) { | |
316 | rsyserr(FERROR, errno, "stat %s failed", | |
317 | full_fname(prev_name)); | |
318 | return -1; | |
319 | } | |
320 | ||
321 | if (statret < 0 && basis_dir[0] != NULL) { | |
322 | /* If we match an alt-dest item, we don't output this as a change. */ | |
323 | char cmpbuf[MAXPATHLEN]; | |
1c3344a1 | 324 | statx alt_sx; |
aadc84d3 | 325 | int j = 0; |
1c3344a1 WD |
326 | #ifdef SUPPORT_ACLS |
327 | alt_sx.acc_acl = alt_sx.def_acl = NULL; | |
328 | #endif | |
aadc84d3 WD |
329 | do { |
330 | pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname); | |
1c3344a1 | 331 | if (link_stat(cmpbuf, &alt_sx.st, 0) < 0) |
aadc84d3 WD |
332 | continue; |
333 | if (link_dest) { | |
1c3344a1 WD |
334 | if (prev_st.st_dev != alt_sx.st.st_dev |
335 | || prev_st.st_ino != alt_sx.st.st_ino) | |
aadc84d3 WD |
336 | continue; |
337 | statret = 1; | |
aadc84d3 WD |
338 | if (verbose < 2 || !stdout_format_has_i) { |
339 | itemizing = 0; | |
340 | code = FNONE; | |
341 | if (verbose > 1 && maybe_ATTRS_REPORT) | |
342 | rprintf(FCLIENT, "%s is uptodate\n", fname); | |
343 | } | |
344 | break; | |
541b23d1 | 345 | } |
1c3344a1 | 346 | if (!unchanged_file(cmpbuf, file, &alt_sx.st)) |
aadc84d3 WD |
347 | continue; |
348 | statret = 1; | |
1c3344a1 | 349 | if (unchanged_attrs(cmpbuf, file, &alt_sx)) |
aadc84d3 WD |
350 | break; |
351 | } while (basis_dir[++j] != NULL); | |
1c3344a1 WD |
352 | if (statret == 1) { |
353 | sxp->st = alt_sx.st; | |
354 | #ifdef SUPPORT_ACLS | |
355 | if (preserve_acls && !S_ISLNK(file->mode)) { | |
356 | if (!ACL_READY(*sxp)) | |
357 | get_acl(cmpbuf, sxp); | |
358 | else { | |
359 | sxp->acc_acl = alt_sx.acc_acl; | |
360 | sxp->def_acl = alt_sx.def_acl; | |
361 | } | |
362 | } | |
363 | #endif | |
364 | } | |
365 | #ifdef SUPPORT_ACLS | |
366 | else if (preserve_acls) | |
367 | free_acl(&alt_sx); | |
368 | #endif | |
d38fc305 | 369 | } |
aadc84d3 | 370 | |
1c3344a1 | 371 | if (maybe_hard_link(file, ndx, fname, statret, sxp, prev_name, &prev_st, |
aadc84d3 WD |
372 | realname, itemizing, code) < 0) |
373 | return -1; | |
374 | ||
375 | if (remove_source_files == 1 && do_xfers) | |
376 | send_msg_int(MSG_SUCCESS, ndx); | |
377 | ||
378 | return 1; | |
d38fc305 WD |
379 | } |
380 | ||
aadc84d3 WD |
381 | int hard_link_one(struct file_struct *file, const char *fname, |
382 | const char *oldname, int terse) | |
a16bbc39 | 383 | { |
aadc84d3 WD |
384 | if (do_link(oldname, fname) < 0) { |
385 | enum logcode code; | |
3cd5301f WD |
386 | if (terse) { |
387 | if (!verbose) | |
388 | return -1; | |
389 | code = FINFO; | |
390 | } else | |
391 | code = FERROR; | |
392 | rsyserr(code, errno, "link %s => %s failed", | |
aadc84d3 WD |
393 | full_fname(fname), oldname); |
394 | return 0; | |
9f2e3c3f WD |
395 | } |
396 | ||
aadc84d3 WD |
397 | file->flags |= FLAG_HLINK_DONE; |
398 | ||
399 | return 1; | |
a16bbc39 | 400 | } |
fae5bb31 | 401 | |
aadc84d3 WD |
402 | void finish_hard_link(struct file_struct *file, const char *fname, |
403 | STRUCT_STAT *stp, int itemizing, enum logcode code, | |
404 | int alt_dest) | |
dc5ddbcc | 405 | { |
1c3344a1 WD |
406 | statx prev_sx; |
407 | STRUCT_STAT st; | |
aadc84d3 WD |
408 | char alt_name[MAXPATHLEN], *prev_name; |
409 | const char *our_name; | |
d4d6646a | 410 | struct file_list *flist; |
aadc84d3 WD |
411 | int prev_statret, ndx, prev_ndx = F_HL_PREV(file); |
412 | ||
413 | if (stp == NULL && prev_ndx >= 0) { | |
414 | if (link_stat(fname, &st, 0) < 0) { | |
415 | rsyserr(FERROR, errno, "stat %s failed", | |
416 | full_fname(fname)); | |
417 | return; | |
9f2e3c3f | 418 | } |
aadc84d3 | 419 | stp = &st; |
9f2e3c3f | 420 | } |
aadc84d3 WD |
421 | |
422 | /* FIRST combined with DONE means we were the first to get done. */ | |
423 | file->flags |= FLAG_HLINK_FIRST | FLAG_HLINK_DONE; | |
424 | F_HL_PREV(file) = alt_dest; | |
425 | if (alt_dest >= 0 && dry_run) { | |
426 | pathjoin(alt_name, MAXPATHLEN, basis_dir[alt_dest], | |
427 | f_name(file, NULL)); | |
428 | our_name = alt_name; | |
429 | } else | |
430 | our_name = fname; | |
431 | ||
1c3344a1 WD |
432 | #ifdef SUPPORT_ACLS |
433 | prev_sx.acc_acl = prev_sx.def_acl = NULL; | |
434 | #endif | |
435 | ||
aadc84d3 | 436 | while ((ndx = prev_ndx) >= 0) { |
1c3344a1 | 437 | int val; |
d4d6646a WD |
438 | flist = flist_for_ndx(ndx); |
439 | assert(flist != NULL); | |
440 | file = flist->files[ndx - flist->ndx_start]; | |
aadc84d3 WD |
441 | file->flags = (file->flags & ~FLAG_HLINK_FIRST) | FLAG_HLINK_DONE; |
442 | prev_ndx = F_HL_PREV(file); | |
443 | prev_name = f_name(file, NULL); | |
1c3344a1 WD |
444 | prev_statret = link_stat(prev_name, &prev_sx.st, 0); |
445 | val = maybe_hard_link(file, ndx, prev_name, prev_statret, &prev_sx, | |
446 | our_name, stp, fname, itemizing, code); | |
d4d6646a | 447 | flist->in_progress--; |
1c3344a1 WD |
448 | #ifdef SUPPORT_ACLS |
449 | if (preserve_acls) | |
450 | free_acl(&prev_sx); | |
451 | #endif | |
452 | if (val < 0) | |
1d5cda22 | 453 | continue; |
663b2857 WD |
454 | if (remove_source_files == 1 && do_xfers) |
455 | send_msg_int(MSG_SUCCESS, ndx); | |
aadc84d3 | 456 | } |
d4d6646a WD |
457 | |
458 | if (inc_recurse) { | |
459 | int gnum = F_HL_GNUM(file); | |
460 | struct ht_int32_node *node = hashtable_find(prior_hlinks, gnum, 0); | |
461 | assert(node != NULL && node->data != NULL); | |
462 | assert(CVAL(node->data, 0) == 0); | |
463 | free(node->data); | |
464 | if (!(node->data = strdup(our_name))) | |
465 | out_of_memory("finish_hard_link"); | |
466 | } | |
dc5ddbcc | 467 | } |
a2ebbffc | 468 | #endif |