| 1 | /* |
| 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 | * |
| 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. |
| 22 | */ |
| 23 | |
| 24 | #include "rsync.h" |
| 25 | |
| 26 | extern int verbose; |
| 27 | extern int do_xfers; |
| 28 | extern int link_dest; |
| 29 | extern int make_backups; |
| 30 | extern int remove_source_files; |
| 31 | extern int stdout_format_has_i; |
| 32 | extern char *basis_dir[]; |
| 33 | extern struct file_list *the_file_list; |
| 34 | |
| 35 | #ifdef SUPPORT_HARD_LINKS |
| 36 | |
| 37 | #define SKIPPED_LINK (-1) |
| 38 | #define FINISHED_LINK (-2) |
| 39 | |
| 40 | #define FPTR(i) (the_file_list->files[i]) |
| 41 | #define LINKED(p1,p2) (FPTR(p1)->F_DEV == FPTR(p2)->F_DEV \ |
| 42 | && FPTR(p1)->F_INODE == FPTR(p2)->F_INODE) |
| 43 | |
| 44 | static int hlink_compare(int *int1, int *int2) |
| 45 | { |
| 46 | struct file_struct *f1 = FPTR(*int1); |
| 47 | struct file_struct *f2 = FPTR(*int2); |
| 48 | |
| 49 | if (f1->F_DEV != f2->F_DEV) |
| 50 | return (int) (f1->F_DEV > f2->F_DEV ? 1 : -1); |
| 51 | |
| 52 | if (f1->F_INODE != f2->F_INODE) |
| 53 | return (int) (f1->F_INODE > f2->F_INODE ? 1 : -1); |
| 54 | |
| 55 | return f_name_cmp(f1, f2); |
| 56 | } |
| 57 | |
| 58 | static int32 *hlink_list; |
| 59 | static int32 hlink_count; |
| 60 | |
| 61 | /* Analyze the data in the hlink_list[], remove items that aren't multiply |
| 62 | * linked, and replace the dev+inode data with the hlindex+next linked list. */ |
| 63 | static void link_idev_data(void) |
| 64 | { |
| 65 | int32 cur, from, to, start; |
| 66 | |
| 67 | alloc_pool_t hlink_pool; |
| 68 | alloc_pool_t idev_pool = the_file_list->hlink_pool; |
| 69 | |
| 70 | hlink_pool = pool_create(128 * 1024, sizeof (struct hlink), |
| 71 | out_of_memory, POOL_INTERN); |
| 72 | |
| 73 | for (from = to = 0; from < hlink_count; from++) { |
| 74 | start = from; |
| 75 | while (1) { |
| 76 | cur = hlink_list[from]; |
| 77 | if (from == hlink_count-1 |
| 78 | || !LINKED(cur, hlink_list[from+1])) |
| 79 | break; |
| 80 | pool_free(idev_pool, 0, FPTR(cur)->link_u.idev); |
| 81 | FPTR(cur)->link_u.links = pool_talloc(hlink_pool, |
| 82 | struct hlink, 1, "hlink_list"); |
| 83 | |
| 84 | FPTR(cur)->F_HLINDEX = to; |
| 85 | FPTR(cur)->F_NEXT = hlink_list[++from]; |
| 86 | } |
| 87 | pool_free(idev_pool, 0, FPTR(cur)->link_u.idev); |
| 88 | if (from > start) { |
| 89 | int head = hlink_list[start]; |
| 90 | FPTR(cur)->link_u.links = pool_talloc(hlink_pool, |
| 91 | struct hlink, 1, "hlink_list"); |
| 92 | |
| 93 | FPTR(head)->flags |= FLAG_HLINK_TOL; |
| 94 | FPTR(cur)->F_HLINDEX = to; |
| 95 | FPTR(cur)->F_NEXT = head; |
| 96 | FPTR(cur)->flags |= FLAG_HLINK_EOL; |
| 97 | hlink_list[to++] = head; |
| 98 | } else |
| 99 | FPTR(cur)->link_u.links = NULL; |
| 100 | } |
| 101 | |
| 102 | if (!to) { |
| 103 | free(hlink_list); |
| 104 | hlink_list = NULL; |
| 105 | pool_destroy(hlink_pool); |
| 106 | hlink_pool = NULL; |
| 107 | } else { |
| 108 | hlink_count = to; |
| 109 | hlink_list = realloc_array(hlink_list, int32, hlink_count); |
| 110 | if (!hlink_list) |
| 111 | out_of_memory("init_hard_links"); |
| 112 | } |
| 113 | the_file_list->hlink_pool = hlink_pool; |
| 114 | pool_destroy(idev_pool); |
| 115 | } |
| 116 | #endif |
| 117 | |
| 118 | void init_hard_links(void) |
| 119 | { |
| 120 | #ifdef SUPPORT_HARD_LINKS |
| 121 | int i; |
| 122 | |
| 123 | if (hlink_list) |
| 124 | free(hlink_list); |
| 125 | |
| 126 | if (!(hlink_list = new_array(int32, the_file_list->count))) |
| 127 | out_of_memory("init_hard_links"); |
| 128 | |
| 129 | hlink_count = 0; |
| 130 | for (i = 0; i < the_file_list->count; i++) { |
| 131 | if (FPTR(i)->link_u.idev) |
| 132 | hlink_list[hlink_count++] = i; |
| 133 | } |
| 134 | |
| 135 | qsort(hlink_list, hlink_count, |
| 136 | sizeof hlink_list[0], (int (*)()) hlink_compare); |
| 137 | |
| 138 | if (!hlink_count) { |
| 139 | free(hlink_list); |
| 140 | hlink_list = NULL; |
| 141 | } else |
| 142 | link_idev_data(); |
| 143 | #endif |
| 144 | } |
| 145 | |
| 146 | #ifdef SUPPORT_HARD_LINKS |
| 147 | static int maybe_hard_link(struct file_struct *file, int ndx, |
| 148 | char *fname, int statret, STRUCT_STAT *st, |
| 149 | char *toname, STRUCT_STAT *to_st, |
| 150 | int itemizing, enum logcode code) |
| 151 | { |
| 152 | if (statret == 0) { |
| 153 | if (st->st_dev == to_st->st_dev |
| 154 | && st->st_ino == to_st->st_ino) { |
| 155 | if (itemizing) { |
| 156 | itemize(file, ndx, statret, st, |
| 157 | ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS, |
| 158 | 0, ""); |
| 159 | } |
| 160 | return 0; |
| 161 | } |
| 162 | if (make_backups) { |
| 163 | if (!make_backup(fname)) |
| 164 | return -1; |
| 165 | } else if (robust_unlink(fname)) { |
| 166 | rsyserr(FERROR, errno, "unlink %s failed", |
| 167 | full_fname(fname)); |
| 168 | return -1; |
| 169 | } |
| 170 | } |
| 171 | return hard_link_one(file, ndx, fname, statret, st, toname, |
| 172 | 0, itemizing, code); |
| 173 | } |
| 174 | #endif |
| 175 | |
| 176 | int hard_link_check(struct file_struct *file, int ndx, char *fname, |
| 177 | int statret, STRUCT_STAT *st, int itemizing, |
| 178 | enum logcode code, int skip) |
| 179 | { |
| 180 | #ifdef SUPPORT_HARD_LINKS |
| 181 | int head; |
| 182 | if (skip && !(file->flags & FLAG_HLINK_EOL)) |
| 183 | head = hlink_list[file->F_HLINDEX] = file->F_NEXT; |
| 184 | else |
| 185 | head = hlink_list[file->F_HLINDEX]; |
| 186 | if (ndx != head) { |
| 187 | struct file_struct *head_file = FPTR(head); |
| 188 | if (!stdout_format_has_i && verbose > 1) { |
| 189 | rprintf(FINFO, "\"%s\" is a hard link\n", |
| 190 | f_name(file, NULL)); |
| 191 | } |
| 192 | if (head_file->F_HLINDEX == FINISHED_LINK) { |
| 193 | STRUCT_STAT st2, st3; |
| 194 | char toname[MAXPATHLEN]; |
| 195 | int ldu = head_file->link_u.links->link_dest_used; |
| 196 | if (ldu) { |
| 197 | pathjoin(toname, MAXPATHLEN, basis_dir[ldu-1], |
| 198 | f_name(head_file, NULL)); |
| 199 | } else |
| 200 | f_name(head_file, toname); |
| 201 | if (link_stat(toname, &st2, 0) < 0) { |
| 202 | rsyserr(FERROR, errno, "stat %s failed", |
| 203 | full_fname(toname)); |
| 204 | return -1; |
| 205 | } |
| 206 | if (statret < 0 && basis_dir[0] != NULL) { |
| 207 | char cmpbuf[MAXPATHLEN]; |
| 208 | int j = 0; |
| 209 | do { |
| 210 | pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname); |
| 211 | if (link_stat(cmpbuf, &st3, 0) < 0) |
| 212 | continue; |
| 213 | if (link_dest) { |
| 214 | if (st2.st_dev != st3.st_dev |
| 215 | || st2.st_ino != st3.st_ino) |
| 216 | continue; |
| 217 | statret = 1; |
| 218 | st = &st3; |
| 219 | if (verbose < 2 || !stdout_format_has_i) { |
| 220 | itemizing = 0; |
| 221 | code = FNONE; |
| 222 | } |
| 223 | break; |
| 224 | } |
| 225 | if (!unchanged_file(cmpbuf, file, &st3)) |
| 226 | continue; |
| 227 | statret = 1; |
| 228 | st = &st3; |
| 229 | if (unchanged_attrs(file, &st3)) |
| 230 | break; |
| 231 | } while (basis_dir[++j] != NULL); |
| 232 | } |
| 233 | maybe_hard_link(file, ndx, fname, statret, st, |
| 234 | toname, &st2, itemizing, code); |
| 235 | if (remove_source_files == 1 && do_xfers) { |
| 236 | char numbuf[4]; |
| 237 | SIVAL(numbuf, 0, ndx); |
| 238 | send_msg(MSG_SUCCESS, numbuf, 4); |
| 239 | } |
| 240 | file->F_HLINDEX = FINISHED_LINK; |
| 241 | } else |
| 242 | file->F_HLINDEX = SKIPPED_LINK; |
| 243 | return 1; |
| 244 | } |
| 245 | #endif |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | #ifdef SUPPORT_HARD_LINKS |
| 250 | int hard_link_one(struct file_struct *file, int ndx, char *fname, |
| 251 | int statret, STRUCT_STAT *st, char *toname, int terse, |
| 252 | int itemizing, enum logcode code) |
| 253 | { |
| 254 | if (do_link(toname, fname)) { |
| 255 | if (terse) { |
| 256 | if (!verbose) |
| 257 | return -1; |
| 258 | code = FINFO; |
| 259 | } else |
| 260 | code = FERROR; |
| 261 | rsyserr(code, errno, "link %s => %s failed", |
| 262 | full_fname(fname), toname); |
| 263 | return -1; |
| 264 | } |
| 265 | |
| 266 | if (itemizing) { |
| 267 | itemize(file, ndx, statret, st, |
| 268 | ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS, 0, |
| 269 | terse ? "" : toname); |
| 270 | } |
| 271 | if (code != FNONE && verbose && !terse) |
| 272 | rprintf(code, "%s => %s\n", fname, toname); |
| 273 | return 0; |
| 274 | } |
| 275 | #endif |
| 276 | |
| 277 | |
| 278 | void hard_link_cluster(struct file_struct *file, int master, int itemizing, |
| 279 | enum logcode code) |
| 280 | { |
| 281 | #ifdef SUPPORT_HARD_LINKS |
| 282 | char hlink1[MAXPATHLEN]; |
| 283 | char *hlink2; |
| 284 | STRUCT_STAT st1, st2; |
| 285 | int statret, ndx = master; |
| 286 | |
| 287 | file->F_HLINDEX = FINISHED_LINK; |
| 288 | if (link_stat(f_name(file, hlink1), &st1, 0) < 0) |
| 289 | return; |
| 290 | if (!(file->flags & FLAG_HLINK_TOL)) { |
| 291 | while (!(file->flags & FLAG_HLINK_EOL)) { |
| 292 | ndx = file->F_NEXT; |
| 293 | file = FPTR(ndx); |
| 294 | } |
| 295 | } |
| 296 | do { |
| 297 | ndx = file->F_NEXT; |
| 298 | file = FPTR(ndx); |
| 299 | if (file->F_HLINDEX != SKIPPED_LINK) |
| 300 | continue; |
| 301 | hlink2 = f_name(file, NULL); |
| 302 | statret = link_stat(hlink2, &st2, 0); |
| 303 | maybe_hard_link(file, ndx, hlink2, statret, &st2, |
| 304 | hlink1, &st1, itemizing, code); |
| 305 | if (remove_source_files == 1 && do_xfers) { |
| 306 | char numbuf[4]; |
| 307 | SIVAL(numbuf, 0, ndx); |
| 308 | send_msg(MSG_SUCCESS, numbuf, 4); |
| 309 | } |
| 310 | file->F_HLINDEX = FINISHED_LINK; |
| 311 | } while (!(file->flags & FLAG_HLINK_EOL)); |
| 312 | #endif |
| 313 | } |