Commit | Line | Data |
---|---|---|
dc5ddbcc AT |
1 | /* |
2 | Copyright (C) Andrew Tridgell 1996 | |
3 | Copyright (C) Paul Mackerras 1996 | |
6e69cff1 | 4 | Copyright (C) 2002 by Martin Pool <mbp@samba.org> |
dc5ddbcc AT |
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 | ||
dc5ddbcc | 23 | extern int dry_run; |
9a52223b | 24 | extern int verbose; |
dc5ddbcc AT |
25 | |
26 | #if SUPPORT_HARD_LINKS | |
6e69cff1 | 27 | static int hlink_compare(struct file_struct *f1, struct file_struct *f2) |
dc5ddbcc | 28 | { |
6e69cff1 MP |
29 | if (!S_ISREG(f1->mode) && !S_ISREG(f2->mode)) |
30 | return 0; | |
31 | if (!S_ISREG(f1->mode)) | |
32 | return -1; | |
33 | if (!S_ISREG(f2->mode)) | |
34 | return 1; | |
dc5ddbcc | 35 | |
6e69cff1 MP |
36 | if (f1->dev != f2->dev) |
37 | return (int) (f1->dev > f2->dev ? 1 : -1); | |
dc5ddbcc | 38 | |
6e69cff1 MP |
39 | if (f1->inode != f2->inode) |
40 | return (int) (f1->inode > f2->inode ? 1 : -1); | |
dc5ddbcc | 41 | |
6e69cff1 | 42 | return file_compare(&f1, &f2); |
dc5ddbcc AT |
43 | } |
44 | ||
45 | ||
3a6a366f AT |
46 | static struct file_struct *hlink_list; |
47 | static int hlink_count; | |
dc5ddbcc AT |
48 | #endif |
49 | ||
50 | void init_hard_links(struct file_list *flist) | |
51 | { | |
52 | #if SUPPORT_HARD_LINKS | |
dd04a034 | 53 | int i; |
6e69cff1 MP |
54 | if (flist->count < 2) |
55 | return; | |
dc5ddbcc | 56 | |
6e69cff1 MP |
57 | if (hlink_list) |
58 | free(hlink_list); | |
59 | ||
58cadc86 | 60 | if (!(hlink_list = new_array(struct file_struct, flist->count))) |
dd04a034 | 61 | out_of_memory("init_hard_links"); |
dc5ddbcc | 62 | |
dd04a034 | 63 | for (i = 0; i < flist->count; i++) |
6e69cff1 MP |
64 | memcpy(&hlink_list[i], flist->files[i], |
65 | sizeof(hlink_list[0])); | |
dc5ddbcc | 66 | |
6e69cff1 MP |
67 | qsort(hlink_list, flist->count, |
68 | sizeof(hlink_list[0]), (int (*)()) hlink_compare); | |
dc5ddbcc | 69 | |
6e69cff1 | 70 | hlink_count = flist->count; |
dc5ddbcc AT |
71 | #endif |
72 | } | |
73 | ||
74 | /* check if a file should be skipped because it is the same as an | |
75 | earlier hard link */ | |
76 | int check_hard_link(struct file_struct *file) | |
77 | { | |
78 | #if SUPPORT_HARD_LINKS | |
6e69cff1 MP |
79 | int low = 0, high = hlink_count - 1; |
80 | int ret = 0; | |
81 | ||
82 | if (!hlink_list || !S_ISREG(file->mode)) | |
83 | return 0; | |
84 | ||
85 | while (low != high) { | |
86 | int mid = (low + high) / 2; | |
87 | ret = hlink_compare(&hlink_list[mid], file); | |
88 | if (ret == 0) { | |
89 | low = mid; | |
90 | break; | |
91 | } | |
92 | if (ret > 0) | |
93 | high = mid; | |
94 | else | |
95 | low = mid + 1; | |
96 | } | |
97 | ||
527a51ce MP |
98 | /* XXX: To me this looks kind of dodgy -- why do we use [low] |
99 | * here and [low-1] below? -- mbp */ | |
6e69cff1 MP |
100 | if (hlink_compare(&hlink_list[low], file) != 0) |
101 | return 0; | |
102 | ||
103 | if (low > 0 && | |
104 | S_ISREG(hlink_list[low - 1].mode) && | |
105 | file->dev == hlink_list[low - 1].dev && | |
4f2dcb17 MP |
106 | file->inode == hlink_list[low - 1].inode) { |
107 | if (verbose >= 2) { | |
108 | rprintf(FINFO, "check_hard_link: \"%s\" is a hard link to file %d, \"%s\"\n", | |
20c15aea | 109 | f_name(file), low-1, f_name(&hlink_list[low-1])); |
4f2dcb17 | 110 | } |
6e69cff1 | 111 | return 1; |
4f2dcb17 | 112 | } |
dc5ddbcc AT |
113 | #endif |
114 | ||
6e69cff1 | 115 | return 0; |
dc5ddbcc AT |
116 | } |
117 | ||
118 | ||
a16bbc39 AT |
119 | #if SUPPORT_HARD_LINKS |
120 | static void hard_link_one(int i) | |
121 | { | |
6e69cff1 | 122 | STRUCT_STAT st1, st2; |
a16bbc39 | 123 | |
6e69cff1 MP |
124 | if (link_stat(f_name(&hlink_list[i - 1]), &st1) != 0) |
125 | return; | |
a16bbc39 | 126 | |
6e69cff1 MP |
127 | if (link_stat(f_name(&hlink_list[i]), &st2) != 0) { |
128 | if (do_link | |
129 | (f_name(&hlink_list[i - 1]), | |
130 | f_name(&hlink_list[i])) != 0) { | |
a16bbc39 | 131 | if (verbose > 0) |
6e69cff1 | 132 | rprintf(FINFO, "link %s => %s : %s\n", |
a16bbc39 | 133 | f_name(&hlink_list[i]), |
6e69cff1 MP |
134 | f_name(&hlink_list[i - 1]), |
135 | strerror(errno)); | |
a16bbc39 AT |
136 | return; |
137 | } | |
138 | } else { | |
6e69cff1 MP |
139 | if (st2.st_dev == st1.st_dev && st2.st_ino == st1.st_ino) |
140 | return; | |
141 | ||
c7c11a0d | 142 | if (robust_unlink(f_name(&hlink_list[i])) != 0 || |
6e69cff1 MP |
143 | do_link(f_name(&hlink_list[i - 1]), |
144 | f_name(&hlink_list[i])) != 0) { | |
a16bbc39 | 145 | if (verbose > 0) |
6e69cff1 | 146 | rprintf(FINFO, "link %s => %s : %s\n", |
a16bbc39 | 147 | f_name(&hlink_list[i]), |
6e69cff1 MP |
148 | f_name(&hlink_list[i - 1]), |
149 | strerror(errno)); | |
a16bbc39 AT |
150 | return; |
151 | } | |
152 | } | |
153 | if (verbose > 0) | |
6e69cff1 MP |
154 | rprintf(FINFO, "%s => %s\n", |
155 | f_name(&hlink_list[i]), | |
156 | f_name(&hlink_list[i - 1])); | |
a16bbc39 AT |
157 | } |
158 | #endif | |
159 | ||
fae5bb31 MP |
160 | |
161 | ||
162 | /** | |
163 | * Create any hard links in the global hlink_list. They were put | |
164 | * there by running init_hard_links on the filelist. | |
165 | **/ | |
166 | void do_hard_links(void) | |
dc5ddbcc AT |
167 | { |
168 | #if SUPPORT_HARD_LINKS | |
a16bbc39 | 169 | int i; |
a16bbc39 | 170 | |
6e69cff1 MP |
171 | if (!hlink_list) |
172 | return; | |
173 | ||
174 | for (i = 1; i < hlink_count; i++) { | |
a16bbc39 | 175 | if (S_ISREG(hlink_list[i].mode) && |
6e69cff1 MP |
176 | S_ISREG(hlink_list[i - 1].mode) && |
177 | hlink_list[i].basename && hlink_list[i - 1].basename && | |
178 | hlink_list[i].dev == hlink_list[i - 1].dev && | |
179 | hlink_list[i].inode == hlink_list[i - 1].inode) { | |
a16bbc39 | 180 | hard_link_one(i); |
6e69cff1 | 181 | } |
dc5ddbcc | 182 | } |
dc5ddbcc AT |
183 | #endif |
184 | } |