| 1 | /* |
| 2 | Copyright (C) Andrew Tridgell 1996 |
| 3 | Copyright (C) Paul Mackerras 1996 |
| 4 | Copyright (C) 2002 by Martin Pool <mbp@samba.org> |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 | */ |
| 20 | |
| 21 | #include "rsync.h" |
| 22 | |
| 23 | extern int dry_run; |
| 24 | extern int verbose; |
| 25 | extern int make_backups; |
| 26 | extern struct file_list *the_file_list; |
| 27 | |
| 28 | #ifdef SUPPORT_HARD_LINKS |
| 29 | |
| 30 | #define SKIPPED_LINK (-1) |
| 31 | #define FINISHED_LINK (-2) |
| 32 | |
| 33 | #define FPTR(i) (the_file_list->files[i]) |
| 34 | #define LINKED(p1,p2) (FPTR(p1)->F_DEV == FPTR(p2)->F_DEV \ |
| 35 | && FPTR(p1)->F_INODE == FPTR(p2)->F_INODE) |
| 36 | |
| 37 | static int hlink_compare(int *int1, int *int2) |
| 38 | { |
| 39 | struct file_struct *f1 = FPTR(*int1); |
| 40 | struct file_struct *f2 = FPTR(*int2); |
| 41 | |
| 42 | if (f1->F_DEV != f2->F_DEV) |
| 43 | return (int) (f1->F_DEV > f2->F_DEV ? 1 : -1); |
| 44 | |
| 45 | if (f1->F_INODE != f2->F_INODE) |
| 46 | return (int) (f1->F_INODE > f2->F_INODE ? 1 : -1); |
| 47 | |
| 48 | return f_name_cmp(f1, f2); |
| 49 | } |
| 50 | |
| 51 | static int *hlink_list; |
| 52 | static int hlink_count; |
| 53 | |
| 54 | /* Analyze the data in the hlink_list[], remove items that aren't multiply |
| 55 | * linked, and replace the dev+inode data with the hlindex+next linked list. */ |
| 56 | static void link_idev_data(void) |
| 57 | { |
| 58 | int cur, from, to, start; |
| 59 | |
| 60 | alloc_pool_t hlink_pool; |
| 61 | alloc_pool_t idev_pool = the_file_list->hlink_pool; |
| 62 | |
| 63 | hlink_pool = pool_create(128 * 1024, sizeof (struct hlink), |
| 64 | out_of_memory, POOL_INTERN); |
| 65 | |
| 66 | for (from = to = 0; from < hlink_count; from++) { |
| 67 | start = from; |
| 68 | while (1) { |
| 69 | cur = hlink_list[from]; |
| 70 | if (from == hlink_count-1 |
| 71 | || !LINKED(cur, hlink_list[from+1])) |
| 72 | break; |
| 73 | pool_free(idev_pool, 0, FPTR(cur)->link_u.idev); |
| 74 | FPTR(cur)->link_u.links = pool_talloc(hlink_pool, |
| 75 | struct hlink, 1, "hlink_list"); |
| 76 | |
| 77 | FPTR(cur)->F_HLINDEX = to; |
| 78 | FPTR(cur)->F_NEXT = hlink_list[++from]; |
| 79 | } |
| 80 | pool_free(idev_pool, 0, FPTR(cur)->link_u.idev); |
| 81 | if (from > start) { |
| 82 | int head = hlink_list[start]; |
| 83 | FPTR(cur)->link_u.links = pool_talloc(hlink_pool, |
| 84 | struct hlink, 1, "hlink_list"); |
| 85 | |
| 86 | FPTR(head)->flags |= FLAG_HLINK_TOL; |
| 87 | FPTR(cur)->F_HLINDEX = to; |
| 88 | FPTR(cur)->F_NEXT = head; |
| 89 | FPTR(cur)->flags |= FLAG_HLINK_EOL; |
| 90 | hlink_list[to++] = head; |
| 91 | } else |
| 92 | FPTR(cur)->link_u.links = NULL; |
| 93 | } |
| 94 | |
| 95 | if (!to) { |
| 96 | free(hlink_list); |
| 97 | hlink_list = NULL; |
| 98 | pool_destroy(hlink_pool); |
| 99 | hlink_pool = NULL; |
| 100 | } else { |
| 101 | hlink_count = to; |
| 102 | hlink_list = realloc_array(hlink_list, int, hlink_count); |
| 103 | if (!hlink_list) |
| 104 | out_of_memory("init_hard_links"); |
| 105 | } |
| 106 | the_file_list->hlink_pool = hlink_pool; |
| 107 | pool_destroy(idev_pool); |
| 108 | } |
| 109 | #endif |
| 110 | |
| 111 | void init_hard_links(void) |
| 112 | { |
| 113 | #ifdef SUPPORT_HARD_LINKS |
| 114 | int i; |
| 115 | |
| 116 | if (hlink_list) |
| 117 | free(hlink_list); |
| 118 | |
| 119 | if (!(hlink_list = new_array(int, the_file_list->count))) |
| 120 | out_of_memory("init_hard_links"); |
| 121 | |
| 122 | hlink_count = 0; |
| 123 | for (i = 0; i < the_file_list->count; i++) { |
| 124 | if (FPTR(i)->link_u.idev) |
| 125 | hlink_list[hlink_count++] = i; |
| 126 | } |
| 127 | |
| 128 | qsort(hlink_list, hlink_count, |
| 129 | sizeof hlink_list[0], (int (*)()) hlink_compare); |
| 130 | |
| 131 | if (!hlink_count) { |
| 132 | free(hlink_list); |
| 133 | hlink_list = NULL; |
| 134 | } else |
| 135 | link_idev_data(); |
| 136 | #endif |
| 137 | } |
| 138 | |
| 139 | #ifdef SUPPORT_HARD_LINKS |
| 140 | static int maybe_hard_link(struct file_struct *file, int ndx, |
| 141 | char *fname, int statret, STRUCT_STAT *st, |
| 142 | char *toname, STRUCT_STAT *to_st, |
| 143 | int itemizing, enum logcode code) |
| 144 | { |
| 145 | if (statret == 0) { |
| 146 | if (st->st_dev == to_st->st_dev |
| 147 | && st->st_ino == to_st->st_ino) { |
| 148 | if (itemizing) { |
| 149 | itemize(file, ndx, statret, st, |
| 150 | ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS, |
| 151 | 0, ""); |
| 152 | } |
| 153 | return 0; |
| 154 | } |
| 155 | if (make_backups) { |
| 156 | if (!make_backup(fname)) |
| 157 | return -1; |
| 158 | } else if (robust_unlink(fname)) { |
| 159 | rsyserr(FERROR, errno, "unlink %s failed", |
| 160 | full_fname(fname)); |
| 161 | return -1; |
| 162 | } |
| 163 | } |
| 164 | return hard_link_one(file, ndx, fname, statret, st, toname, |
| 165 | 0, itemizing, code); |
| 166 | } |
| 167 | #endif |
| 168 | |
| 169 | int hard_link_check(struct file_struct *file, int ndx, char *fname, |
| 170 | int statret, STRUCT_STAT *st, int itemizing, |
| 171 | enum logcode code, int skip) |
| 172 | { |
| 173 | #ifdef SUPPORT_HARD_LINKS |
| 174 | int head; |
| 175 | if (!file->link_u.links) |
| 176 | return 0; |
| 177 | if (skip && !(file->flags & FLAG_HLINK_EOL)) |
| 178 | head = hlink_list[file->F_HLINDEX] = file->F_NEXT; |
| 179 | else |
| 180 | head = hlink_list[file->F_HLINDEX]; |
| 181 | if (ndx != head) { |
| 182 | struct file_struct *head_file = FPTR(head); |
| 183 | if (verbose > 2) { |
| 184 | rprintf(FINFO, "\"%s\" is a hard link\n", |
| 185 | safe_fname(f_name(file))); |
| 186 | } |
| 187 | if (head_file->F_HLINDEX == FINISHED_LINK) { |
| 188 | STRUCT_STAT st2; |
| 189 | char *toname = f_name(head_file); |
| 190 | if (link_stat(toname, &st2, 0) < 0) { |
| 191 | rsyserr(FERROR, errno, "stat %s failed", |
| 192 | full_fname(toname)); |
| 193 | return -1; |
| 194 | } |
| 195 | maybe_hard_link(file, ndx, fname, statret, st, |
| 196 | toname, &st2, itemizing, code); |
| 197 | file->F_HLINDEX = FINISHED_LINK; |
| 198 | } else |
| 199 | file->F_HLINDEX = SKIPPED_LINK; |
| 200 | return 1; |
| 201 | } |
| 202 | #endif |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | #ifdef SUPPORT_HARD_LINKS |
| 207 | int hard_link_one(struct file_struct *file, int ndx, char *fname, |
| 208 | int statret, STRUCT_STAT *st, char *toname, int terse, |
| 209 | int itemizing, enum logcode code) |
| 210 | { |
| 211 | if (do_link(toname, fname)) { |
| 212 | if (terse) { |
| 213 | if (!verbose) |
| 214 | return -1; |
| 215 | code = FINFO; |
| 216 | } else |
| 217 | code = FERROR; |
| 218 | rsyserr(code, errno, "link %s => %s failed", |
| 219 | full_fname(fname), safe_fname(toname)); |
| 220 | return -1; |
| 221 | } |
| 222 | |
| 223 | if (itemizing) { |
| 224 | itemize(file, ndx, statret, st, |
| 225 | ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS, 0, |
| 226 | terse ? "" : toname); |
| 227 | } |
| 228 | if (code && verbose && !terse) { |
| 229 | rprintf(code, "%s => %s\n", |
| 230 | safe_fname(fname), safe_fname(toname)); |
| 231 | } |
| 232 | return 0; |
| 233 | } |
| 234 | #endif |
| 235 | |
| 236 | |
| 237 | void hard_link_cluster(struct file_struct *file, int master, int itemizing, |
| 238 | enum logcode code) |
| 239 | { |
| 240 | #ifdef SUPPORT_HARD_LINKS |
| 241 | char hlink1[MAXPATHLEN]; |
| 242 | char *hlink2; |
| 243 | STRUCT_STAT st1, st2; |
| 244 | int statret, ndx = master; |
| 245 | |
| 246 | file->F_HLINDEX = FINISHED_LINK; |
| 247 | if (link_stat(f_name_to(file, hlink1), &st1, 0) < 0) |
| 248 | return; |
| 249 | if (!(file->flags & FLAG_HLINK_TOL)) { |
| 250 | while (!(file->flags & FLAG_HLINK_EOL)) { |
| 251 | ndx = file->F_NEXT; |
| 252 | file = FPTR(ndx); |
| 253 | } |
| 254 | } |
| 255 | do { |
| 256 | ndx = file->F_NEXT; |
| 257 | file = FPTR(ndx); |
| 258 | if (file->F_HLINDEX != SKIPPED_LINK) |
| 259 | continue; |
| 260 | hlink2 = f_name(file); |
| 261 | statret = link_stat(hlink2, &st2, 0); |
| 262 | maybe_hard_link(file, ndx, hlink2, statret, &st2, |
| 263 | hlink1, &st1, itemizing, code); |
| 264 | file->F_HLINDEX = FINISHED_LINK; |
| 265 | } while (!(file->flags & FLAG_HLINK_EOL)); |
| 266 | #endif |
| 267 | } |