Commit | Line | Data |
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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> | |
7 | * Copyright (C) 2004, 2005, 2006 Wayne Davison | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
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 WD |
19 | * You should have received a copy of the GNU General Public License along |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
0f78b815 | 22 | */ |
dc5ddbcc AT |
23 | |
24 | #include "rsync.h" | |
25 | ||
9a52223b | 26 | extern int verbose; |
541b23d1 | 27 | extern int link_dest; |
417c99f6 | 28 | extern int make_backups; |
a45f581b | 29 | extern int log_format_has_i; |
541b23d1 | 30 | extern char *basis_dir[]; |
9f2e3c3f | 31 | extern struct file_list *the_file_list; |
dc5ddbcc | 32 | |
4f5b0756 | 33 | #ifdef SUPPORT_HARD_LINKS |
9f2e3c3f | 34 | |
3cd5301f WD |
35 | #define SKIPPED_LINK (-1) |
36 | #define FINISHED_LINK (-2) | |
37 | ||
9f2e3c3f WD |
38 | #define FPTR(i) (the_file_list->files[i]) |
39 | #define LINKED(p1,p2) (FPTR(p1)->F_DEV == FPTR(p2)->F_DEV \ | |
40 | && FPTR(p1)->F_INODE == FPTR(p2)->F_INODE) | |
41 | ||
42 | static int hlink_compare(int *int1, int *int2) | |
dc5ddbcc | 43 | { |
9f2e3c3f WD |
44 | struct file_struct *f1 = FPTR(*int1); |
45 | struct file_struct *f2 = FPTR(*int2); | |
11dc2740 | 46 | |
92cc9dd7 WD |
47 | if (f1->F_DEV != f2->F_DEV) |
48 | return (int) (f1->F_DEV > f2->F_DEV ? 1 : -1); | |
dc5ddbcc | 49 | |
92cc9dd7 WD |
50 | if (f1->F_INODE != f2->F_INODE) |
51 | return (int) (f1->F_INODE > f2->F_INODE ? 1 : -1); | |
dc5ddbcc | 52 | |
122d1771 | 53 | return f_name_cmp(f1, f2); |
11dc2740 | 54 | } |
dc5ddbcc | 55 | |
9f2e3c3f | 56 | static int *hlink_list; |
417c99f6 | 57 | static int hlink_count; |
1d5cda22 | 58 | |
1d5cda22 | 59 | /* Analyze the data in the hlink_list[], remove items that aren't multiply |
90481755 | 60 | * linked, and replace the dev+inode data with the hlindex+next linked list. */ |
9f2e3c3f | 61 | static void link_idev_data(void) |
1d5cda22 | 62 | { |
97e786c3 | 63 | int cur, from, to, start; |
1d5cda22 | 64 | |
9935066b | 65 | alloc_pool_t hlink_pool; |
9f2e3c3f | 66 | alloc_pool_t idev_pool = the_file_list->hlink_pool; |
9935066b S |
67 | |
68 | hlink_pool = pool_create(128 * 1024, sizeof (struct hlink), | |
69 | out_of_memory, POOL_INTERN); | |
70 | ||
1d5cda22 WD |
71 | for (from = to = 0; from < hlink_count; from++) { |
72 | start = from; | |
97e786c3 WD |
73 | while (1) { |
74 | cur = hlink_list[from]; | |
75 | if (from == hlink_count-1 | |
76 | || !LINKED(cur, hlink_list[from+1])) | |
77 | break; | |
78 | pool_free(idev_pool, 0, FPTR(cur)->link_u.idev); | |
79 | FPTR(cur)->link_u.links = pool_talloc(hlink_pool, | |
9935066b S |
80 | struct hlink, 1, "hlink_list"); |
81 | ||
97e786c3 WD |
82 | FPTR(cur)->F_HLINDEX = to; |
83 | FPTR(cur)->F_NEXT = hlink_list[++from]; | |
1d5cda22 | 84 | } |
97e786c3 | 85 | pool_free(idev_pool, 0, FPTR(cur)->link_u.idev); |
1d5cda22 | 86 | if (from > start) { |
97e786c3 WD |
87 | int head = hlink_list[start]; |
88 | FPTR(cur)->link_u.links = pool_talloc(hlink_pool, | |
9935066b S |
89 | struct hlink, 1, "hlink_list"); |
90 | ||
9f2e3c3f | 91 | FPTR(head)->flags |= FLAG_HLINK_TOL; |
97e786c3 WD |
92 | FPTR(cur)->F_HLINDEX = to; |
93 | FPTR(cur)->F_NEXT = head; | |
94 | FPTR(cur)->flags |= FLAG_HLINK_EOL; | |
1d5cda22 | 95 | hlink_list[to++] = head; |
97e786c3 WD |
96 | } else |
97 | FPTR(cur)->link_u.links = NULL; | |
1d5cda22 WD |
98 | } |
99 | ||
100 | if (!to) { | |
101 | free(hlink_list); | |
102 | hlink_list = NULL; | |
9935066b S |
103 | pool_destroy(hlink_pool); |
104 | hlink_pool = NULL; | |
1d5cda22 WD |
105 | } else { |
106 | hlink_count = to; | |
9f2e3c3f WD |
107 | hlink_list = realloc_array(hlink_list, int, hlink_count); |
108 | if (!hlink_list) | |
1d5cda22 WD |
109 | out_of_memory("init_hard_links"); |
110 | } | |
9f2e3c3f | 111 | the_file_list->hlink_pool = hlink_pool; |
9935066b | 112 | pool_destroy(idev_pool); |
1d5cda22 | 113 | } |
dc5ddbcc AT |
114 | #endif |
115 | ||
9f2e3c3f | 116 | void init_hard_links(void) |
dc5ddbcc | 117 | { |
4f5b0756 | 118 | #ifdef SUPPORT_HARD_LINKS |
dd04a034 | 119 | int i; |
11dc2740 | 120 | |
6e69cff1 MP |
121 | if (hlink_list) |
122 | free(hlink_list); | |
123 | ||
9f2e3c3f | 124 | if (!(hlink_list = new_array(int, the_file_list->count))) |
dd04a034 | 125 | out_of_memory("init_hard_links"); |
6aae748e | 126 | |
11dc2740 | 127 | hlink_count = 0; |
9f2e3c3f WD |
128 | for (i = 0; i < the_file_list->count; i++) { |
129 | if (FPTR(i)->link_u.idev) | |
130 | hlink_list[hlink_count++] = i; | |
11dc2740 | 131 | } |
dc5ddbcc | 132 | |
11dc2740 | 133 | qsort(hlink_list, hlink_count, |
0d6e308b | 134 | sizeof hlink_list[0], (int (*)()) hlink_compare); |
dc5ddbcc | 135 | |
6aae748e WD |
136 | if (!hlink_count) { |
137 | free(hlink_list); | |
138 | hlink_list = NULL; | |
1d5cda22 | 139 | } else |
9f2e3c3f | 140 | link_idev_data(); |
dc5ddbcc | 141 | #endif |
dc5ddbcc AT |
142 | } |
143 | ||
3cd5301f WD |
144 | #ifdef SUPPORT_HARD_LINKS |
145 | static int maybe_hard_link(struct file_struct *file, int ndx, | |
146 | char *fname, int statret, STRUCT_STAT *st, | |
147 | char *toname, STRUCT_STAT *to_st, | |
148 | int itemizing, enum logcode code) | |
149 | { | |
150 | if (statret == 0) { | |
151 | if (st->st_dev == to_st->st_dev | |
152 | && st->st_ino == to_st->st_ino) { | |
153 | if (itemizing) { | |
154 | itemize(file, ndx, statret, st, | |
155 | ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS, | |
156 | 0, ""); | |
157 | } | |
158 | return 0; | |
159 | } | |
160 | if (make_backups) { | |
161 | if (!make_backup(fname)) | |
162 | return -1; | |
163 | } else if (robust_unlink(fname)) { | |
164 | rsyserr(FERROR, errno, "unlink %s failed", | |
165 | full_fname(fname)); | |
166 | return -1; | |
167 | } | |
168 | } | |
169 | return hard_link_one(file, ndx, fname, statret, st, toname, | |
170 | 0, itemizing, code); | |
171 | } | |
172 | #endif | |
173 | ||
174 | int hard_link_check(struct file_struct *file, int ndx, char *fname, | |
175 | int statret, STRUCT_STAT *st, int itemizing, | |
176 | enum logcode code, int skip) | |
d38fc305 | 177 | { |
4f5b0756 | 178 | #ifdef SUPPORT_HARD_LINKS |
3cd5301f | 179 | int head; |
d38fc305 | 180 | if (skip && !(file->flags & FLAG_HLINK_EOL)) |
3cd5301f WD |
181 | head = hlink_list[file->F_HLINDEX] = file->F_NEXT; |
182 | else | |
183 | head = hlink_list[file->F_HLINDEX]; | |
184 | if (ndx != head) { | |
185 | struct file_struct *head_file = FPTR(head); | |
6cbde57d WD |
186 | if (!log_format_has_i && verbose > 1) { |
187 | rprintf(FINFO, "\"%s\" is a hard link\n", | |
188 | f_name(file, NULL)); | |
189 | } | |
3cd5301f | 190 | if (head_file->F_HLINDEX == FINISHED_LINK) { |
541b23d1 | 191 | STRUCT_STAT st2, st3; |
6cbde57d | 192 | char *toname = f_name(head_file, NULL); |
3cd5301f WD |
193 | if (link_stat(toname, &st2, 0) < 0) { |
194 | rsyserr(FERROR, errno, "stat %s failed", | |
195 | full_fname(toname)); | |
196 | return -1; | |
197 | } | |
541b23d1 WD |
198 | if (statret < 0 && basis_dir[0] != NULL) { |
199 | char cmpbuf[MAXPATHLEN]; | |
200 | int j = 0; | |
201 | do { | |
202 | pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname); | |
203 | if (link_stat(cmpbuf, &st3, 0) < 0) | |
204 | continue; | |
205 | if (link_dest) { | |
206 | if (st2.st_dev != st3.st_dev | |
207 | || st2.st_ino != st3.st_ino) | |
208 | continue; | |
209 | statret = 1; | |
210 | st = &st3; | |
211 | if (verbose < 2 || !log_format_has_i) | |
212 | itemizing = code = 0; | |
213 | break; | |
214 | } | |
215 | if (!unchanged_file(cmpbuf, file, &st3)) | |
216 | continue; | |
217 | statret = 1; | |
218 | st = &st3; | |
219 | if (unchanged_attrs(file, &st3)) | |
220 | break; | |
221 | } while (basis_dir[++j] != NULL); | |
222 | } | |
3cd5301f WD |
223 | maybe_hard_link(file, ndx, fname, statret, st, |
224 | toname, &st2, itemizing, code); | |
225 | file->F_HLINDEX = FINISHED_LINK; | |
226 | } else | |
227 | file->F_HLINDEX = SKIPPED_LINK; | |
d38fc305 WD |
228 | return 1; |
229 | } | |
bb91a624 | 230 | #endif |
d38fc305 WD |
231 | return 0; |
232 | } | |
233 | ||
4f5b0756 | 234 | #ifdef SUPPORT_HARD_LINKS |
9f2e3c3f WD |
235 | int hard_link_one(struct file_struct *file, int ndx, char *fname, |
236 | int statret, STRUCT_STAT *st, char *toname, int terse, | |
237 | int itemizing, enum logcode code) | |
a16bbc39 | 238 | { |
9f2e3c3f | 239 | if (do_link(toname, fname)) { |
3cd5301f WD |
240 | if (terse) { |
241 | if (!verbose) | |
242 | return -1; | |
243 | code = FINFO; | |
244 | } else | |
245 | code = FERROR; | |
246 | rsyserr(code, errno, "link %s => %s failed", | |
45c49b52 | 247 | full_fname(fname), toname); |
9f2e3c3f WD |
248 | return -1; |
249 | } | |
250 | ||
251 | if (itemizing) { | |
b7d4d28b WD |
252 | itemize(file, ndx, statret, st, |
253 | ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS, 0, | |
9f2e3c3f WD |
254 | terse ? "" : toname); |
255 | } | |
45c49b52 WD |
256 | if (code && verbose && !terse) |
257 | rprintf(code, "%s => %s\n", fname, toname); | |
9f2e3c3f | 258 | return 0; |
a16bbc39 AT |
259 | } |
260 | #endif | |
261 | ||
fae5bb31 | 262 | |
9f2e3c3f WD |
263 | void hard_link_cluster(struct file_struct *file, int master, int itemizing, |
264 | enum logcode code) | |
dc5ddbcc | 265 | { |
4f5b0756 | 266 | #ifdef SUPPORT_HARD_LINKS |
3fef5364 WD |
267 | char hlink1[MAXPATHLEN]; |
268 | char *hlink2; | |
1d5cda22 | 269 | STRUCT_STAT st1, st2; |
9f2e3c3f | 270 | int statret, ndx = master; |
a16bbc39 | 271 | |
3cd5301f | 272 | file->F_HLINDEX = FINISHED_LINK; |
6cbde57d | 273 | if (link_stat(f_name(file, hlink1), &st1, 0) < 0) |
6e69cff1 | 274 | return; |
9f2e3c3f WD |
275 | if (!(file->flags & FLAG_HLINK_TOL)) { |
276 | while (!(file->flags & FLAG_HLINK_EOL)) { | |
277 | ndx = file->F_NEXT; | |
278 | file = FPTR(ndx); | |
279 | } | |
280 | } | |
281 | do { | |
282 | ndx = file->F_NEXT; | |
283 | file = FPTR(ndx); | |
3cd5301f | 284 | if (file->F_HLINDEX != SKIPPED_LINK) |
1d5cda22 | 285 | continue; |
6cbde57d | 286 | hlink2 = f_name(file, NULL); |
3cd5301f WD |
287 | statret = link_stat(hlink2, &st2, 0); |
288 | maybe_hard_link(file, ndx, hlink2, statret, &st2, | |
289 | hlink1, &st1, itemizing, code); | |
290 | file->F_HLINDEX = FINISHED_LINK; | |
9f2e3c3f | 291 | } while (!(file->flags & FLAG_HLINK_EOL)); |
dc5ddbcc AT |
292 | #endif |
293 | } |