2 * Copyright (c) 2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
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
34 * $DragonFly: src/sbin/hammer/blockmap.c,v 1.2 2008/06/17 04:03:38 dillon Exp $
40 * Allocate big-blocks using our poor-man's volume->vol_free_off.
42 * If the zone is HAMMER_ZONE_FREEMAP_INDEX we are bootstrapping the freemap
43 * itself and cannot update it yet.
46 alloc_bigblock(struct volume_info *volume, int zone)
48 struct volume_info *root_vol;
49 hammer_blockmap_t freemap;
50 struct buffer_info *buffer1 = NULL;
51 struct buffer_info *buffer2 = NULL;
52 struct hammer_blockmap_layer1 *layer1;
53 struct hammer_blockmap_layer2 *layer2;
54 hammer_off_t layer1_offset;
55 hammer_off_t layer2_offset;
56 hammer_off_t result_offset;
59 volume = get_volume(RootVolNo);
61 result_offset = volume->vol_free_off;
62 if (result_offset >= volume->vol_free_end)
63 errx(1, "alloc_bigblock: Ran out of room, filesystem too small");
65 volume->vol_free_off += HAMMER_BIGBLOCK_SIZE;
68 * Update the freemap if not zone4.
70 if (zone != HAMMER_ZONE_FREEMAP_INDEX) {
71 root_vol = get_volume(RootVolNo);
72 freemap = &root_vol->ondisk->vol0_blockmap[HAMMER_ZONE_FREEMAP_INDEX];
74 layer1_offset = freemap->phys_offset +
75 HAMMER_BLOCKMAP_LAYER1_OFFSET(result_offset);
76 layer1 = get_buffer_data(layer1_offset, &buffer1, 0);
77 assert(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
78 --layer1->blocks_free;
79 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
80 buffer1->cache.modified = 1;
82 layer2_offset = layer1->phys_offset +
83 HAMMER_BLOCKMAP_LAYER2_OFFSET(result_offset);
84 layer2 = get_buffer_data(layer2_offset, &buffer2, 0);
85 assert(layer2->zone == 0);
87 layer2->append_off = HAMMER_BIGBLOCK_SIZE;
88 layer2->bytes_free = 0;
89 layer2->entry_crc = crc32(layer2, HAMMER_LAYER2_CRCSIZE);
90 buffer2->cache.modified = 1;
92 --root_vol->ondisk->vol0_stat_freebigblocks;
93 root_vol->cache.modified = 1;
101 return(result_offset);
105 * Allocate a chunk of data out of a blockmap. This is a simplified
106 * version which uses next_offset as a simple allocation iterator.
109 alloc_blockmap(int zone, int bytes, hammer_off_t *result_offp,
110 struct buffer_info **bufferp)
112 struct volume_info *volume;
113 hammer_blockmap_t blockmap;
114 hammer_blockmap_t freemap;
115 struct buffer_info *buffer1 = NULL;
116 struct buffer_info *buffer2 = NULL;
117 struct hammer_blockmap_layer1 *layer1;
118 struct hammer_blockmap_layer2 *layer2;
119 hammer_off_t layer1_offset;
120 hammer_off_t layer2_offset;
121 hammer_off_t chunk_offset;
124 volume = get_volume(RootVolNo);
126 blockmap = &volume->ondisk->vol0_blockmap[zone];
127 freemap = &volume->ondisk->vol0_blockmap[HAMMER_ZONE_FREEMAP_INDEX];
128 assert(HAMMER_ZONE_DECODE(blockmap->next_offset) == zone);
131 * Alignment and buffer-boundary issues. If the allocation would
132 * cross a buffer boundary we have to skip to the next buffer.
134 bytes = (bytes + 15) & ~15;
135 assert(bytes > 0 && bytes <= HAMMER_BUFSIZE); /* not HAMMER_XBUFSIZE */
136 assert(hammer_is_zone2_mapped_index(zone));
139 assert(blockmap->next_offset != HAMMER_ZONE_ENCODE(zone + 1, 0));
141 if ((blockmap->next_offset ^ (blockmap->next_offset + bytes - 1)) &
143 volume->cache.modified = 1;
144 blockmap->next_offset = (blockmap->next_offset + bytes - 1) &
147 chunk_offset = blockmap->next_offset & HAMMER_BIGBLOCK_MASK;
152 layer1_offset = freemap->phys_offset +
153 HAMMER_BLOCKMAP_LAYER1_OFFSET(blockmap->next_offset);
154 layer1 = get_buffer_data(layer1_offset, &buffer1, 0);
155 assert(!(chunk_offset == 0 && layer1->blocks_free == 0));
157 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL) {
158 fprintf(stderr, "alloc_blockmap: ran out of space!\n");
163 * Dive layer 2, each entry represents a big-block.
165 layer2_offset = layer1->phys_offset +
166 HAMMER_BLOCKMAP_LAYER2_OFFSET(blockmap->next_offset);
167 layer2 = get_buffer_data(layer2_offset, &buffer2, 0);
169 if (layer2->zone == HAMMER_ZONE_UNAVAIL_INDEX) {
170 fprintf(stderr, "alloc_blockmap: ran out of space!\n");
175 * If we are entering a new big-block assign ownership to our
176 * zone. If the big-block is owned by another zone skip it.
178 if (layer2->zone == 0) {
179 --layer1->blocks_free;
180 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
182 --volume->ondisk->vol0_stat_freebigblocks;
183 assert(layer2->bytes_free == HAMMER_BIGBLOCK_SIZE);
184 assert(layer2->append_off == 0);
186 if (layer2->zone != zone) {
187 volume->cache.modified = 1;
188 blockmap->next_offset = (blockmap->next_offset + HAMMER_BIGBLOCK_SIZE) &
189 ~HAMMER_BIGBLOCK_MASK64;
193 assert(layer2->append_off == chunk_offset);
194 layer2->bytes_free -= bytes;
195 *result_offp = blockmap->next_offset;
196 blockmap->next_offset += bytes;
197 layer2->append_off = (int)blockmap->next_offset & HAMMER_BIGBLOCK_MASK;
198 layer2->entry_crc = crc32(layer2, HAMMER_LAYER2_CRCSIZE);
200 ptr = get_buffer_data(*result_offp, bufferp, 0);
201 (*bufferp)->cache.modified = 1;
203 buffer1->cache.modified = 1;
204 buffer2->cache.modified = 1;
205 volume->cache.modified = 1;
214 blockmap_lookup(hammer_off_t zone_offset,
215 struct hammer_blockmap_layer1 *save_layer1,
216 struct hammer_blockmap_layer2 *save_layer2,
219 struct volume_info *root_volume = NULL;
220 hammer_blockmap_t blockmap;
221 hammer_blockmap_t freemap;
222 struct hammer_blockmap_layer1 *layer1;
223 struct hammer_blockmap_layer2 *layer2;
224 struct buffer_info *buffer1 = NULL;
225 struct buffer_info *buffer2 = NULL;
226 hammer_off_t layer1_offset;
227 hammer_off_t layer2_offset;
228 hammer_off_t result_offset;
234 bzero(save_layer1, sizeof(*save_layer1));
236 bzero(save_layer2, sizeof(*save_layer2));
238 zone = HAMMER_ZONE_DECODE(zone_offset);
240 if (zone <= HAMMER_ZONE_RAW_VOLUME_INDEX)
242 if (zone >= HAMMER_MAX_ZONES)
247 result_offset = HAMMER_OFF_BAD;
251 root_volume = get_volume(RootVolNo);
252 blockmap = &root_volume->ondisk->vol0_blockmap[zone];
254 if (zone == HAMMER_ZONE_RAW_BUFFER_INDEX) {
255 result_offset = zone_offset;
256 } else if (zone == HAMMER_ZONE_UNDO_INDEX) {
257 i = (zone_offset & HAMMER_OFF_SHORT_MASK) /
258 HAMMER_BIGBLOCK_SIZE;
259 if (zone_offset >= blockmap->alloc_offset) {
261 result_offset = HAMMER_OFF_BAD;
264 result_offset = root_volume->ondisk->vol0_undo_array[i] +
265 (zone_offset & HAMMER_BIGBLOCK_MASK64);
267 result_offset = hammer_xlate_to_zone2(zone_offset);
271 * The blockmap should match the requested zone (else the volume
274 * Note that a valid offset can still be returned if AssertOnFailure
277 if (HAMMER_ZONE_FREEMAP_INDEX != zone &&
278 HAMMER_ZONE_DECODE(blockmap->alloc_offset) != zone) {
284 * Validate that the big-block is assigned to the zone. Also
285 * assign save_layer{1,2}.
288 freemap = &root_volume->ondisk->vol0_blockmap[HAMMER_ZONE_FREEMAP_INDEX];
292 layer1_offset = freemap->phys_offset +
293 HAMMER_BLOCKMAP_LAYER1_OFFSET(result_offset);
294 layer1 = get_buffer_data(layer1_offset, &buffer1, 0);
295 if (layer1 == NULL) {
299 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL) {
305 *save_layer1 = *layer1;
308 * Dive layer 2, each entry represents a big-block.
310 layer2_offset = layer1->phys_offset +
311 HAMMER_BLOCKMAP_LAYER2_OFFSET(result_offset);
312 layer2 = get_buffer_data(layer2_offset, &buffer2, 0);
314 if (layer2 == NULL) {
318 if (layer2->zone != zone) {
323 *save_layer2 = *layer2;
328 rel_volume(root_volume);
330 if (AssertOnFailure && error != 0)
331 errx(1, "blockmap_lookup: error=%d\n", error);
335 return(result_offset);