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/*
Copyright (C) Andrew Tridgell 1996
Copyright (C) Paul Mackerras 1996
Copyright (C) 2002 by Martin Pool <mbp@samba.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "rsync.h"
extern int dry_run;
extern int verbose;
#if SUPPORT_HARD_LINKS
static int hlink_compare(struct file_struct *f1, struct file_struct *f2)
{
if (!S_ISREG(f1->mode) && !S_ISREG(f2->mode))
return 0;
if (!S_ISREG(f1->mode))
return -1;
if (!S_ISREG(f2->mode))
return 1;
if (f1->dev != f2->dev)
return (int) (f1->dev > f2->dev ? 1 : -1);
if (f1->inode != f2->inode)
return (int) (f1->inode > f2->inode ? 1 : -1);
return file_compare(&f1, &f2);
}
static struct file_struct *hlink_list;
static int hlink_count;
#endif
void init_hard_links(struct file_list *flist)
{
#if SUPPORT_HARD_LINKS
int i;
if (flist->count < 2)
return;
if (hlink_list)
free(hlink_list);
if (!(hlink_list =
(struct file_struct *) malloc(sizeof(hlink_list[0]) *
flist->count)))
out_of_memory("init_hard_links");
for (i = 0; i < flist->count; i++)
memcpy(&hlink_list[i], flist->files[i],
sizeof(hlink_list[0]));
qsort(hlink_list, flist->count,
sizeof(hlink_list[0]), (int (*)()) hlink_compare);
hlink_count = flist->count;
#endif
}
/* check if a file should be skipped because it is the same as an
earlier hard link */
int check_hard_link(struct file_struct *file)
{
#if SUPPORT_HARD_LINKS
int low = 0, high = hlink_count - 1;
int ret = 0;
if (!hlink_list || !S_ISREG(file->mode))
return 0;
while (low != high) {
int mid = (low + high) / 2;
ret = hlink_compare(&hlink_list[mid], file);
if (ret == 0) {
low = mid;
break;
}
if (ret > 0)
high = mid;
else
low = mid + 1;
}
/* XXX: To me this looks kind of dodgy -- why do we use [low]
* here and [low-1] below? -- mbp */
if (hlink_compare(&hlink_list[low], file) != 0)
return 0;
if (low > 0 &&
S_ISREG(hlink_list[low - 1].mode) &&
file->dev == hlink_list[low - 1].dev &&
file->inode == hlink_list[low - 1].inode) {
if (verbose >= 2) {
rprintf(FINFO, "check_hard_link: \"%s\" is a hard link to file %d, \"%s\"\n",
f_name(file), low-1, f_name(&hlink_list[low-1]));
}
return 1;
}
#endif
return 0;
}
#if SUPPORT_HARD_LINKS
static void hard_link_one(int i)
{
STRUCT_STAT st1, st2;
if (link_stat(f_name(&hlink_list[i - 1]), &st1) != 0)
return;
if (link_stat(f_name(&hlink_list[i]), &st2) != 0) {
if (do_link
(f_name(&hlink_list[i - 1]),
f_name(&hlink_list[i])) != 0) {
if (verbose > 0)
rprintf(FINFO, "link %s => %s : %s\n",
f_name(&hlink_list[i]),
f_name(&hlink_list[i - 1]),
strerror(errno));
return;
}
} else {
if (st2.st_dev == st1.st_dev && st2.st_ino == st1.st_ino)
return;
if (robust_unlink(f_name(&hlink_list[i])) != 0 ||
do_link(f_name(&hlink_list[i - 1]),
f_name(&hlink_list[i])) != 0) {
if (verbose > 0)
rprintf(FINFO, "link %s => %s : %s\n",
f_name(&hlink_list[i]),
f_name(&hlink_list[i - 1]),
strerror(errno));
return;
}
}
if (verbose > 0)
rprintf(FINFO, "%s => %s\n",
f_name(&hlink_list[i]),
f_name(&hlink_list[i - 1]));
}
#endif
/**
* Create any hard links in the global hlink_list. They were put
* there by running init_hard_links on the filelist.
**/
void do_hard_links(void)
{
#if SUPPORT_HARD_LINKS
int i;
if (!hlink_list)
return;
for (i = 1; i < hlink_count; i++) {
if (S_ISREG(hlink_list[i].mode) &&
S_ISREG(hlink_list[i - 1].mode) &&
hlink_list[i].basename && hlink_list[i - 1].basename &&
hlink_list[i].dev == hlink_list[i - 1].dev &&
hlink_list[i].inode == hlink_list[i - 1].inode) {
hard_link_one(i);
}
}
#endif
}
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