1 /*
2 * Copyright (c) 2007-2016 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include "hammer.h"
36
37 static int hammer_test_offset(const char *msg, hammer_off_t offset);
38 static void hammer_strip_bigblock(int zone, hammer_off_t offset);
39 static void hammer_ask_yn(void);
40
41 void
hammer_cmd_strip(void)42 hammer_cmd_strip(void)
43 {
44 volume_info_t volume;
45 hammer_blockmap_t rootmap;
46 hammer_blockmap_layer1_t layer1;
47 hammer_blockmap_layer2_t layer2;
48 buffer_info_t buffer1 = NULL;
49 buffer_info_t buffer2 = NULL;
50 hammer_off_t layer1_offset;
51 hammer_off_t layer2_offset;
52 hammer_off_t phys_offset;
53 hammer_off_t block_offset;
54 hammer_off_t offset;
55 int i, zone = HAMMER_ZONE_FREEMAP_INDEX;
56
57 hammer_ask_yn();
58
59 volume = get_root_volume();
60 if (volume == NULL) {
61 printf("No root volume found\n");
62 goto strip_header;
63 }
64
65 rootmap = &volume->ondisk->vol0_blockmap[zone];
66 if (!hammer_test_offset("layer1 physical", rootmap->phys_offset))
67 goto strip_header;
68
69 for (phys_offset = HAMMER_ZONE_ENCODE(zone, 0);
70 phys_offset < HAMMER_ZONE_ENCODE(zone, HAMMER_OFF_LONG_MASK);
71 phys_offset += HAMMER_BLOCKMAP_LAYER2) {
72 /*
73 * Dive layer 1.
74 */
75 layer1_offset = rootmap->phys_offset +
76 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_offset);
77 if (!hammer_test_offset("layer1", layer1_offset))
78 break;
79 layer1 = get_buffer_data(layer1_offset, &buffer1, 0);
80
81 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL)
82 continue;
83
84 for (block_offset = 0;
85 block_offset < HAMMER_BLOCKMAP_LAYER2;
86 block_offset += HAMMER_BIGBLOCK_SIZE) {
87 offset = phys_offset + block_offset;
88 /*
89 * Dive layer 2, each entry represents a big-block.
90 */
91 layer2_offset = layer1->phys_offset +
92 HAMMER_BLOCKMAP_LAYER2_OFFSET(block_offset);
93 if (!hammer_test_offset("layer2", layer2_offset))
94 break;
95 layer2 = get_buffer_data(layer2_offset, &buffer2, 0);
96
97 if (layer2->zone == HAMMER_ZONE_BTREE_INDEX ||
98 layer2->zone == HAMMER_ZONE_META_INDEX) {
99 hammer_strip_bigblock(layer2->zone, offset);
100 layer2->zone = HAMMER_ZONE_UNAVAIL_INDEX;
101 layer2->append_off = HAMMER_BIGBLOCK_SIZE;
102 layer2->bytes_free = 0;
103 hammer_crc_set_layer2(HammerVersion, layer2);
104 buffer2->cache.modified = 1;
105 } else if (layer2->zone == HAMMER_ZONE_UNAVAIL_INDEX) {
106 break;
107 }
108 }
109 }
110 rel_buffer(buffer1);
111 rel_buffer(buffer2);
112
113 strip_header:
114 for (i = 0; i < HAMMER_MAX_VOLUMES; i++) {
115 volume = get_volume(i);
116 if (volume) {
117 bzero(volume->ondisk, sizeof(*volume->ondisk));
118 memcpy(&volume->ondisk->vol_signature, "STRIPPED", 8);
119 printf("Stripped volume header %s\n", volume->name);
120 }
121 }
122
123 flush_all_volumes();
124 }
125
126 static
127 int
hammer_test_offset(const char * msg,hammer_off_t offset)128 hammer_test_offset(const char *msg, hammer_off_t offset)
129 {
130 if (get_volume(HAMMER_VOL_DECODE(offset)) == NULL) {
131 printf("Invalid volume# %d\n", HAMMER_VOL_DECODE(offset));
132 return(0);
133 }
134 if (!hammer_is_zone_raw_buffer(offset)) {
135 printf("Invalid %s offset 0x%jx\n", msg, offset);
136 return(0);
137 }
138
139 return(1);
140 }
141
142 static
143 void
hammer_strip_bigblock(int zone,hammer_off_t offset)144 hammer_strip_bigblock(int zone, hammer_off_t offset)
145 {
146 buffer_info_t buffer = NULL;
147 int i;
148
149 assert(hammer_is_index_record(zone));
150 assert((offset & HAMMER_BIGBLOCK_MASK64) == 0);
151 assert((offset & HAMMER_BUFMASK) == 0);
152 offset = hammer_xlate_to_zoneX(zone, offset);
153
154 /*
155 * This format is taken from hammer blockmap.
156 */
157 printf("Stripped big-block ");
158 if (VerboseOpt) {
159 printf("%016jx zone=%-2d vol=%-3d L1#=%-6d L2#=%-6d L1=%-7lu L2=%-7lu\n",
160 offset,
161 zone,
162 HAMMER_VOL_DECODE(offset),
163 HAMMER_BLOCKMAP_LAYER1_INDEX(offset),
164 HAMMER_BLOCKMAP_LAYER2_INDEX(offset),
165 HAMMER_BLOCKMAP_LAYER1_OFFSET(offset),
166 HAMMER_BLOCKMAP_LAYER2_OFFSET(offset));
167 } else {
168 printf("%016jx\n", offset);
169 }
170
171 for (i = 0; i < HAMMER_BIGBLOCK_SIZE; i += HAMMER_BUFSIZE) {
172 get_buffer_data(offset + i, &buffer, 1);
173 assert(buffer);
174 }
175 }
176
177 static
178 void
hammer_ask_yn(void)179 hammer_ask_yn(void)
180 {
181 volume_info_t volume;
182 #define _HAMMER "HAMMER filesystem"
183 char type[64];
184 char label[64 + 4];
185 int i;
186
187 volume = get_root_volume();
188
189 if (volume && volume->ondisk->vol_signature == HAMMER_FSBUF_VOLUME)
190 strcpy(type, _HAMMER);
191 else
192 strcpy(type, "devices");
193
194 if (volume && volume->ondisk->vol_label[0]) {
195 snprintf(label, sizeof(label), " (%s)",
196 volume->ondisk->vol_label);
197 } else {
198 strcpy(label, "");
199 }
200
201 /*
202 * This format is taken from hammer pfs-destroy.
203 */
204 printf("You have requested that %s%s be stripped", type, label);
205 if (strcmp(type, _HAMMER))
206 printf(", but %s may not be %s volumes\n", type, _HAMMER);
207 else
208 printf("\n");
209
210 printf("Do you really want to do this? [y/n] ");
211 fflush(stdout);
212 if (getyn() == 0) {
213 errx(1, "No action taken");
214 /* not reached */
215 }
216
217 if (strcmp(type, _HAMMER)) {
218 printf("Are you absolutely sure you want to do this? [y/n] ");
219 fflush(stdout);
220 if (getyn() == 0) {
221 errx(1, "No action taken");
222 /* not reached */
223 }
224 }
225
226 printf("Stripping %s%s", type, label);
227
228 if (DebugOpt) {
229 printf("\n");
230 } else {
231 printf(" in");
232 for (i = 5; i; --i) {
233 printf(" %d", i);
234 fflush(stdout);
235 sleep(1);
236 }
237 printf(".. starting destruction pass\n");
238 }
239 }
240