1 /* 2 * Copyright (c) 2008 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 * $DragonFly: src/sbin/hammer/blockmap.c,v 1.2 2008/06/17 04:03:38 dillon Exp $ 35 */ 36 37 #include "hammer_util.h" 38 39 /* 40 * Allocate big-blocks using our poor-man's volume->vol_free_off. 41 * We are bootstrapping the freemap itself and cannot update it yet. 42 */ 43 hammer_off_t 44 bootstrap_bigblock(struct volume_info *volume) 45 { 46 hammer_off_t result_offset; 47 48 assert_volume_offset(volume); 49 result_offset = volume->vol_free_off; 50 51 volume->vol_free_off += HAMMER_BIGBLOCK_SIZE; 52 53 return(result_offset); 54 } 55 56 /* 57 * Allocate a big-block for zone-3 for UNDO/REDO FIFO. 58 */ 59 hammer_off_t 60 alloc_undo_bigblock(struct volume_info *volume) 61 { 62 hammer_blockmap_t freemap; 63 struct buffer_info *buffer1 = NULL; 64 struct buffer_info *buffer2 = NULL; 65 hammer_blockmap_layer1_t layer1; 66 hammer_blockmap_layer2_t layer2; 67 hammer_off_t layer1_offset; 68 hammer_off_t layer2_offset; 69 hammer_off_t result_offset; 70 71 /* Only root volume needs formatting */ 72 assert(volume->vol_no == HAMMER_ROOT_VOLNO); 73 74 result_offset = bootstrap_bigblock(volume); 75 freemap = &volume->ondisk->vol0_blockmap[HAMMER_ZONE_FREEMAP_INDEX]; 76 77 /* 78 * Dive layer 1. 79 */ 80 layer1_offset = freemap->phys_offset + 81 HAMMER_BLOCKMAP_LAYER1_OFFSET(result_offset); 82 layer1 = get_buffer_data(layer1_offset, &buffer1, 0); 83 assert(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL); 84 --layer1->blocks_free; 85 hammer_crc_set_layer1(layer1); 86 buffer1->cache.modified = 1; 87 88 /* 89 * Dive layer 2, each entry represents a big-block. 90 */ 91 layer2_offset = layer1->phys_offset + 92 HAMMER_BLOCKMAP_LAYER2_OFFSET(result_offset); 93 layer2 = get_buffer_data(layer2_offset, &buffer2, 0); 94 assert(layer2->zone == 0); 95 layer2->zone = HAMMER_ZONE_UNDO_INDEX; 96 layer2->append_off = HAMMER_BIGBLOCK_SIZE; 97 layer2->bytes_free = 0; 98 hammer_crc_set_layer2(layer2); 99 buffer2->cache.modified = 1; 100 101 --volume->ondisk->vol0_stat_freebigblocks; 102 103 rel_buffer(buffer1); 104 rel_buffer(buffer2); 105 106 return(result_offset); 107 } 108 109 /* 110 * Allocate a chunk of data out of a blockmap. This is a simplified 111 * version which uses next_offset as a simple allocation iterator. 112 */ 113 void * 114 alloc_blockmap(int zone, int bytes, hammer_off_t *result_offp, 115 struct buffer_info **bufferp) 116 { 117 struct volume_info *volume; 118 hammer_blockmap_t blockmap; 119 hammer_blockmap_t freemap; 120 struct buffer_info *buffer1 = NULL; 121 struct buffer_info *buffer2 = NULL; 122 hammer_blockmap_layer1_t layer1; 123 hammer_blockmap_layer2_t layer2; 124 hammer_off_t layer1_offset; 125 hammer_off_t layer2_offset; 126 hammer_off_t chunk_offset; 127 void *ptr; 128 129 volume = get_root_volume(); 130 131 blockmap = &volume->ondisk->vol0_blockmap[zone]; 132 freemap = &volume->ondisk->vol0_blockmap[HAMMER_ZONE_FREEMAP_INDEX]; 133 assert(HAMMER_ZONE_DECODE(blockmap->next_offset) == zone); 134 135 /* 136 * Alignment and buffer-boundary issues. If the allocation would 137 * cross a buffer boundary we have to skip to the next buffer. 138 */ 139 bytes = HAMMER_DATA_DOALIGN(bytes); 140 assert(bytes > 0 && bytes <= HAMMER_BUFSIZE); /* not HAMMER_XBUFSIZE */ 141 assert(hammer_is_zone2_mapped_index(zone)); 142 143 again: 144 assert(blockmap->next_offset != HAMMER_ZONE_ENCODE(zone + 1, 0)); 145 146 if ((blockmap->next_offset ^ (blockmap->next_offset + bytes - 1)) & 147 ~HAMMER_BUFMASK64) { 148 blockmap->next_offset = (blockmap->next_offset + bytes - 1) & 149 ~HAMMER_BUFMASK64; 150 } 151 chunk_offset = blockmap->next_offset & HAMMER_BIGBLOCK_MASK; 152 153 /* 154 * Dive layer 1. 155 */ 156 layer1_offset = freemap->phys_offset + 157 HAMMER_BLOCKMAP_LAYER1_OFFSET(blockmap->next_offset); 158 layer1 = get_buffer_data(layer1_offset, &buffer1, 0); 159 assert(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL); 160 assert(!(chunk_offset == 0 && layer1->blocks_free == 0)); 161 162 /* 163 * Dive layer 2, each entry represents a big-block. 164 */ 165 layer2_offset = layer1->phys_offset + 166 HAMMER_BLOCKMAP_LAYER2_OFFSET(blockmap->next_offset); 167 layer2 = get_buffer_data(layer2_offset, &buffer2, 0); 168 169 if (layer2->zone == HAMMER_ZONE_UNAVAIL_INDEX) { 170 fprintf(stderr, "alloc_blockmap: layer2 ran out of space!\n"); 171 exit(1); 172 } 173 174 /* 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. 177 */ 178 if (layer2->zone == 0) { 179 --layer1->blocks_free; 180 hammer_crc_set_layer1(layer1); 181 layer2->zone = zone; 182 --volume->ondisk->vol0_stat_freebigblocks; 183 assert(layer2->bytes_free == HAMMER_BIGBLOCK_SIZE); 184 assert(layer2->append_off == 0); 185 } 186 if (layer2->zone != zone) { 187 blockmap->next_offset = 188 HAMMER_ZONE_LAYER2_NEXT_OFFSET(blockmap->next_offset); 189 goto again; 190 } 191 192 assert(layer2->append_off == chunk_offset); 193 layer2->bytes_free -= bytes; 194 *result_offp = blockmap->next_offset; 195 blockmap->next_offset += bytes; 196 layer2->append_off = (int)blockmap->next_offset & HAMMER_BIGBLOCK_MASK; 197 hammer_crc_set_layer2(layer2); 198 199 ptr = get_buffer_data(*result_offp, bufferp, 0); 200 (*bufferp)->cache.modified = 1; 201 202 buffer1->cache.modified = 1; 203 buffer2->cache.modified = 1; 204 205 rel_buffer(buffer1); 206 rel_buffer(buffer2); 207 return(ptr); 208 } 209 210 hammer_off_t 211 blockmap_lookup(hammer_off_t zone_offset, 212 hammer_blockmap_layer1_t save_layer1, 213 hammer_blockmap_layer2_t save_layer2, 214 int *errorp) 215 { 216 struct volume_info *root_volume = NULL; 217 hammer_blockmap_t blockmap; 218 hammer_blockmap_t freemap; 219 hammer_blockmap_layer1_t layer1; 220 hammer_blockmap_layer2_t layer2; 221 struct buffer_info *buffer1 = NULL; 222 struct buffer_info *buffer2 = NULL; 223 hammer_off_t layer1_offset; 224 hammer_off_t layer2_offset; 225 hammer_off_t result_offset; 226 int zone; 227 int i; 228 int error = 0; 229 230 if (save_layer1) 231 bzero(save_layer1, sizeof(*save_layer1)); 232 if (save_layer2) 233 bzero(save_layer2, sizeof(*save_layer2)); 234 235 zone = HAMMER_ZONE_DECODE(zone_offset); 236 237 if (zone <= HAMMER_ZONE_RAW_VOLUME_INDEX) 238 error = -1; 239 if (zone >= HAMMER_MAX_ZONES) 240 error = -2; 241 if (error) { 242 result_offset = HAMMER_OFF_BAD; 243 goto done; 244 } 245 246 root_volume = get_root_volume(); 247 blockmap = &root_volume->ondisk->vol0_blockmap[zone]; 248 249 if (zone == HAMMER_ZONE_RAW_BUFFER_INDEX) { 250 result_offset = zone_offset; 251 } else if (zone == HAMMER_ZONE_UNDO_INDEX) { 252 i = HAMMER_OFF_SHORT_ENCODE(zone_offset) / HAMMER_BIGBLOCK_SIZE; 253 if (zone_offset >= blockmap->alloc_offset) { 254 error = -3; 255 result_offset = HAMMER_OFF_BAD; 256 goto done; 257 } 258 result_offset = root_volume->ondisk->vol0_undo_array[i] + 259 (zone_offset & HAMMER_BIGBLOCK_MASK64); 260 } else { 261 result_offset = hammer_xlate_to_zone2(zone_offset); 262 } 263 264 /* 265 * The blockmap should match the requested zone (else the volume 266 * header is mashed). 267 */ 268 if (HAMMER_ZONE_FREEMAP_INDEX != zone && 269 HAMMER_ZONE_DECODE(blockmap->alloc_offset) != zone) { 270 error = -4; 271 goto done; 272 } 273 274 /* 275 * Validate that the big-block is assigned to the zone. Also 276 * assign save_layer{1,2}. 277 */ 278 279 freemap = &root_volume->ondisk->vol0_blockmap[HAMMER_ZONE_FREEMAP_INDEX]; 280 /* 281 * Dive layer 1. 282 */ 283 layer1_offset = freemap->phys_offset + 284 HAMMER_BLOCKMAP_LAYER1_OFFSET(result_offset); 285 layer1 = get_buffer_data(layer1_offset, &buffer1, 0); 286 if (layer1 == NULL) { 287 error = -5; 288 goto done; 289 } 290 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL) { 291 error = -6; 292 goto done; 293 } 294 295 if (save_layer1) 296 *save_layer1 = *layer1; 297 298 /* 299 * Dive layer 2, each entry represents a big-block. 300 */ 301 layer2_offset = layer1->phys_offset + 302 HAMMER_BLOCKMAP_LAYER2_OFFSET(result_offset); 303 layer2 = get_buffer_data(layer2_offset, &buffer2, 0); 304 305 if (layer2 == NULL) { 306 error = -7; 307 goto done; 308 } 309 if (layer2->zone != zone) { 310 error = -8; 311 goto done; 312 } 313 if (save_layer2) 314 *save_layer2 = *layer2; 315 316 done: 317 rel_buffer(buffer1); 318 rel_buffer(buffer2); 319 320 if (errorp) 321 *errorp = error; 322 323 return(result_offset); 324 } 325 326