hlink.c

説明を見る。
00001 /*
00002    Copyright (C) Andrew Tridgell 1996
00003    Copyright (C) Paul Mackerras 1996
00004    Copyright (C) 2002 by Martin Pool <mbp@samba.org>
00005 
00006    This program is free software; you can redistribute it and/or modify
00007    it under the terms of the GNU General Public License as published by
00008    the Free Software Foundation; either version 2 of the License, or
00009    (at your option) any later version.
00010 
00011    This program is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014    GNU General Public License for more details.
00015 
00016    You should have received a copy of the GNU General Public License
00017    along with this program; if not, write to the Free Software
00018    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00019 */
00020 
00021 #include "rsync.h"
00022 
00023 extern int verbose;
00024 extern int link_dest;
00025 extern int make_backups;
00026 extern int log_format_has_i;
00027 extern char *basis_dir[];
00028 extern struct file_list *the_file_list;
00029 
00030 #ifdef SUPPORT_HARD_LINKS
00031 
00032 #define SKIPPED_LINK (-1)
00033 #define FINISHED_LINK (-2)
00034 
00035 #define FPTR(i) (the_file_list->files[i])
00036 #define LINKED(p1,p2) (FPTR(p1)->F_DEV == FPTR(p2)->F_DEV \
00037                     && FPTR(p1)->F_INODE == FPTR(p2)->F_INODE)
00038 
00039 static int hlink_compare(int *int1, int *int2)
00040 {
00041         struct file_struct *f1 = FPTR(*int1);
00042         struct file_struct *f2 = FPTR(*int2);
00043 
00044         if (f1->F_DEV != f2->F_DEV)
00045                 return (int) (f1->F_DEV > f2->F_DEV ? 1 : -1);
00046 
00047         if (f1->F_INODE != f2->F_INODE)
00048                 return (int) (f1->F_INODE > f2->F_INODE ? 1 : -1);
00049 
00050         return f_name_cmp(f1, f2);
00051 }
00052 
00053 static int *hlink_list;
00054 static int hlink_count;
00055 
00056 /* Analyze the data in the hlink_list[], remove items that aren't multiply
00057  * linked, and replace the dev+inode data with the hlindex+next linked list. */
00058 static void link_idev_data(void)
00059 {
00060         int cur, from, to, start;
00061 
00062         alloc_pool_t hlink_pool;
00063         alloc_pool_t idev_pool = the_file_list->hlink_pool;
00064 
00065         hlink_pool = pool_create(128 * 1024, sizeof (struct hlink),
00066             out_of_memory, POOL_INTERN);
00067 
00068         for (from = to = 0; from < hlink_count; from++) {
00069                 start = from;
00070                 while (1) {
00071                         cur = hlink_list[from];
00072                         if (from == hlink_count-1
00073                             || !LINKED(cur, hlink_list[from+1]))
00074                                 break;
00075                         pool_free(idev_pool, 0, FPTR(cur)->link_u.idev);
00076                         FPTR(cur)->link_u.links = pool_talloc(hlink_pool,
00077                             struct hlink, 1, "hlink_list");
00078 
00079                         FPTR(cur)->F_HLINDEX = to;
00080                         FPTR(cur)->F_NEXT = hlink_list[++from];
00081                 }
00082                 pool_free(idev_pool, 0, FPTR(cur)->link_u.idev);
00083                 if (from > start) {
00084                         int head = hlink_list[start];
00085                         FPTR(cur)->link_u.links = pool_talloc(hlink_pool,
00086                             struct hlink, 1, "hlink_list");
00087 
00088                         FPTR(head)->flags |= FLAG_HLINK_TOL;
00089                         FPTR(cur)->F_HLINDEX = to;
00090                         FPTR(cur)->F_NEXT = head;
00091                         FPTR(cur)->flags |= FLAG_HLINK_EOL;
00092                         hlink_list[to++] = head;
00093                 } else
00094                         FPTR(cur)->link_u.links = NULL;
00095         }
00096 
00097         if (!to) {
00098                 free(hlink_list);
00099                 hlink_list = NULL;
00100                 pool_destroy(hlink_pool);
00101                 hlink_pool = NULL;
00102         } else {
00103                 hlink_count = to;
00104                 hlink_list = realloc_array(hlink_list, int, hlink_count);
00105                 if (!hlink_list)
00106                         out_of_memory("init_hard_links");
00107         }
00108         the_file_list->hlink_pool = hlink_pool;
00109         pool_destroy(idev_pool);
00110 }
00111 #endif
00112 
00113 void init_hard_links(void)
00114 {
00115 #ifdef SUPPORT_HARD_LINKS
00116         int i;
00117 
00118         if (hlink_list)
00119                 free(hlink_list);
00120 
00121         if (!(hlink_list = new_array(int, the_file_list->count)))
00122                 out_of_memory("init_hard_links");
00123 
00124         hlink_count = 0;
00125         for (i = 0; i < the_file_list->count; i++) {
00126                 if (FPTR(i)->link_u.idev)
00127                         hlink_list[hlink_count++] = i;
00128         }
00129 
00130         qsort(hlink_list, hlink_count,
00131             sizeof hlink_list[0], (int (*)()) hlink_compare);
00132 
00133         if (!hlink_count) {
00134                 free(hlink_list);
00135                 hlink_list = NULL;
00136         } else
00137                 link_idev_data();
00138 #endif
00139 }
00140 
00141 #ifdef SUPPORT_HARD_LINKS
00142 static int maybe_hard_link(struct file_struct *file, int ndx,
00143                            char *fname, int statret, STRUCT_STAT *st,
00144                            char *toname, STRUCT_STAT *to_st,
00145                            int itemizing, enum logcode code)
00146 {
00147         if (statret == 0) {
00148                 if (st->st_dev == to_st->st_dev
00149                  && st->st_ino == to_st->st_ino) {
00150                         if (itemizing) {
00151                                 itemize(file, ndx, statret, st,
00152                                         ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS,
00153                                         0, "");
00154                         }
00155                         return 0;
00156                 }
00157                 if (make_backups) {
00158                         if (!make_backup(fname))
00159                                 return -1;
00160                 } else if (robust_unlink(fname)) {
00161                         rsyserr(FERROR, errno, "unlink %s failed",
00162                                 full_fname(fname));
00163                         return -1;
00164                 }
00165         }
00166         return hard_link_one(file, ndx, fname, statret, st, toname,
00167                              0, itemizing, code);
00168 }
00169 #endif
00170 
00171 int hard_link_check(struct file_struct *file, int ndx, char *fname,
00172                     int statret, STRUCT_STAT *st, int itemizing,
00173                     enum logcode code, int skip)
00174 {
00175 #ifdef SUPPORT_HARD_LINKS
00176         int head;
00177         if (skip && !(file->flags & FLAG_HLINK_EOL))
00178                 head = hlink_list[file->F_HLINDEX] = file->F_NEXT;
00179         else
00180                 head = hlink_list[file->F_HLINDEX];
00181         if (ndx != head) {
00182                 struct file_struct *head_file = FPTR(head);
00183                 if (!log_format_has_i && verbose > 1) {
00184                         rprintf(FINFO, "\"%s\" is a hard link\n",
00185                                 f_name(file, NULL));
00186                 }
00187                 if (head_file->F_HLINDEX == FINISHED_LINK) {
00188                         STRUCT_STAT st2, st3;
00189                         char *toname = f_name(head_file, NULL);
00190                         if (link_stat(toname, &st2, 0) < 0) {
00191                                 rsyserr(FERROR, errno, "stat %s failed",
00192                                         full_fname(toname));
00193                                 return -1;
00194                         }
00195                         if (statret < 0 && basis_dir[0] != NULL) {
00196                                 char cmpbuf[MAXPATHLEN];
00197                                 int j = 0;
00198                                 do {
00199                                         pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
00200                                         if (link_stat(cmpbuf, &st3, 0) < 0)
00201                                                 continue;
00202                                         if (link_dest) {
00203                                                 if (st2.st_dev != st3.st_dev
00204                                                  || st2.st_ino != st3.st_ino)
00205                                                         continue;
00206                                                 statret = 1;
00207                                                 st = &st3;
00208                                                 if (verbose < 2 || !log_format_has_i)
00209                                                         itemizing = code = 0;
00210                                                 break;
00211                                         }
00212                                         if (!unchanged_file(cmpbuf, file, &st3))
00213                                                 continue;
00214                                         statret = 1;
00215                                         st = &st3;
00216                                         if (unchanged_attrs(file, &st3))
00217                                                 break;
00218                                 } while (basis_dir[++j] != NULL);
00219                         }
00220                         maybe_hard_link(file, ndx, fname, statret, st,
00221                                         toname, &st2, itemizing, code);
00222                         file->F_HLINDEX = FINISHED_LINK;
00223                 } else
00224                         file->F_HLINDEX = SKIPPED_LINK;
00225                 return 1;
00226         }
00227 #endif
00228         return 0;
00229 }
00230 
00231 #ifdef SUPPORT_HARD_LINKS
00232 int hard_link_one(struct file_struct *file, int ndx, char *fname,
00233                   int statret, STRUCT_STAT *st, char *toname, int terse,
00234                   int itemizing, enum logcode code)
00235 {
00236         if (do_link(toname, fname)) {
00237                 if (terse) {
00238                         if (!verbose)
00239                                 return -1;
00240                         code = FINFO;
00241                 } else
00242                         code = FERROR;
00243                 rsyserr(code, errno, "link %s => %s failed",
00244                         full_fname(fname), toname);
00245                 return -1;
00246         }
00247 
00248         if (itemizing) {
00249                 itemize(file, ndx, statret, st,
00250                         ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS, 0,
00251                         terse ? "" : toname);
00252         }
00253         if (code && verbose && !terse)
00254                 rprintf(code, "%s => %s\n", fname, toname);
00255         return 0;
00256 }
00257 #endif
00258 
00259 
00260 void hard_link_cluster(struct file_struct *file, int master, int itemizing,
00261                        enum logcode code)
00262 {
00263 #ifdef SUPPORT_HARD_LINKS
00264         char hlink1[MAXPATHLEN];
00265         char *hlink2;
00266         STRUCT_STAT st1, st2;
00267         int statret, ndx = master;
00268 
00269         file->F_HLINDEX = FINISHED_LINK;
00270         if (link_stat(f_name(file, hlink1), &st1, 0) < 0)
00271                 return;
00272         if (!(file->flags & FLAG_HLINK_TOL)) {
00273                 while (!(file->flags & FLAG_HLINK_EOL)) {
00274                         ndx = file->F_NEXT;
00275                         file = FPTR(ndx);
00276                 }
00277         }
00278         do {
00279                 ndx = file->F_NEXT;
00280                 file = FPTR(ndx);
00281                 if (file->F_HLINDEX != SKIPPED_LINK)
00282                         continue;
00283                 hlink2 = f_name(file, NULL);
00284                 statret = link_stat(hlink2, &st2, 0);
00285                 maybe_hard_link(file, ndx, hlink2, statret, &st2,
00286                                 hlink1, &st1, itemizing, code);
00287                 file->F_HLINDEX = FINISHED_LINK;
00288         } while (!(file->flags & FLAG_HLINK_EOL));
00289 #endif
00290 }

rsyncに対してSat Dec 5 19:45:41 2009に生成されました。  doxygen 1.4.7