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dc5ddbcc AT |
1 | /* |
2 | Copyright (C) Andrew Tridgell 1996 | |
3 | Copyright (C) Paul Mackerras 1996 | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | #include "rsync.h" | |
21 | ||
22 | extern int am_server; | |
23 | extern int dry_run; | |
24 | ||
25 | #if SUPPORT_HARD_LINKS | |
26 | static int hlink_compare(struct file_struct *f1,struct file_struct *f2) | |
27 | { | |
28 | if (!S_ISREG(f1->mode) && !S_ISREG(f2->mode)) return 0; | |
29 | if (!S_ISREG(f1->mode)) return -1; | |
30 | if (!S_ISREG(f2->mode)) return 1; | |
31 | ||
32 | if (f1->dev != f2->dev) | |
33 | return (f1->dev - f2->dev); | |
34 | ||
35 | if (f1->inode != f2->inode) | |
36 | return (f1->inode - f2->inode); | |
37 | ||
38 | return file_compare(f1,f2); | |
39 | } | |
40 | ||
41 | ||
42 | static struct file_struct *hlink_list = NULL; | |
43 | static int hlink_count=0; | |
44 | #endif | |
45 | ||
46 | void init_hard_links(struct file_list *flist) | |
47 | { | |
48 | #if SUPPORT_HARD_LINKS | |
49 | if (flist->count < 2) return; | |
50 | ||
51 | if (hlink_list) free(hlink_list); | |
52 | ||
53 | if (!(hlink_list = | |
54 | (struct file_struct *)malloc(sizeof(hlink_list[0])*flist->count))) | |
55 | out_of_memory("init_hard_links"); | |
56 | ||
57 | bcopy((char *)flist->files,hlink_list,sizeof(hlink_list[0])*flist->count); | |
58 | ||
59 | qsort(hlink_list,flist->count, | |
60 | sizeof(hlink_list[0]), | |
61 | (int (*)())hlink_compare); | |
62 | ||
63 | hlink_count=flist->count; | |
64 | #endif | |
65 | } | |
66 | ||
67 | /* check if a file should be skipped because it is the same as an | |
68 | earlier hard link */ | |
69 | int check_hard_link(struct file_struct *file) | |
70 | { | |
71 | #if SUPPORT_HARD_LINKS | |
72 | int low=0,high=hlink_count; | |
73 | int mid=0,ret=0; | |
74 | ||
75 | if (!hlink_list || !S_ISREG(file->mode)) return 0; | |
76 | ||
77 | while (low != high) { | |
78 | mid = (low+high)/2; | |
79 | ret = hlink_compare(&hlink_list[mid],file); | |
80 | if (ret == 0) break; | |
81 | if (ret > 0) | |
82 | high=mid; | |
83 | else | |
84 | low=mid+1; | |
85 | } | |
86 | ||
87 | if (hlink_compare(&hlink_list[mid],file) != 0) return 0; | |
88 | ||
89 | if (mid > 0 && | |
90 | S_ISREG(hlink_list[mid-1].mode) && | |
91 | file->dev == hlink_list[mid-1].dev && | |
92 | file->inode == hlink_list[mid-1].inode) | |
93 | return 1; | |
94 | #endif | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | ||
100 | /* create any hard links in the flist */ | |
101 | void do_hard_links(struct file_list *flist) | |
102 | { | |
103 | #if SUPPORT_HARD_LINKS | |
104 | int i; | |
105 | ||
106 | if (!hlink_list) return; | |
107 | ||
108 | for (i=1;i<hlink_count;i++) { | |
109 | if (S_ISREG(hlink_list[i].mode) && | |
110 | S_ISREG(hlink_list[i-1].mode) && | |
111 | hlink_list[i].name && hlink_list[i-1].name && | |
112 | hlink_list[i].dev == hlink_list[i-1].dev && | |
113 | hlink_list[i].inode == hlink_list[i-1].inode) { | |
114 | struct stat st1,st2; | |
115 | ||
116 | if (stat(hlink_list[i-1].name,&st1) != 0) continue; | |
117 | if (stat(hlink_list[i].name,&st2) != 0) { | |
118 | if (!dry_run && link(hlink_list[i-1].name,hlink_list[i].name) != 0) { | |
119 | fprintf(FINFO,"link %s => %s : %s\n", | |
120 | hlink_list[i].name,hlink_list[i-1].name,strerror(errno)); | |
121 | continue; | |
122 | } | |
123 | } else { | |
124 | if (st2.st_dev == st1.st_dev && st2.st_ino == st1.st_ino) continue; | |
125 | ||
126 | if (!dry_run && (unlink(hlink_list[i].name) != 0 || | |
127 | link(hlink_list[i-1].name,hlink_list[i].name) != 0)) { | |
128 | fprintf(FINFO,"link %s => %s : %s\n", | |
129 | hlink_list[i].name,hlink_list[i-1].name,strerror(errno)); | |
130 | continue; | |
131 | } | |
132 | } | |
133 | fprintf(FINFO,"%s => %s\n", | |
134 | hlink_list[i].name,hlink_list[i-1].name); | |
135 | } | |
136 | } | |
137 | #endif | |
138 | } |