Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Red Hat. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 20 | #include <linux/sched.h> |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 21 | #include <linux/math64.h> |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 22 | #include "ctree.h" |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 23 | #include "free-space-cache.h" |
| 24 | #include "transaction.h" |
| 25 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 26 | #define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8) |
| 27 | #define MAX_CACHE_BYTES_PER_GIG (32 * 1024) |
| 28 | |
| 29 | static inline unsigned long offset_to_bit(u64 bitmap_start, u64 sectorsize, |
| 30 | u64 offset) |
| 31 | { |
| 32 | BUG_ON(offset < bitmap_start); |
| 33 | offset -= bitmap_start; |
| 34 | return (unsigned long)(div64_u64(offset, sectorsize)); |
| 35 | } |
| 36 | |
| 37 | static inline unsigned long bytes_to_bits(u64 bytes, u64 sectorsize) |
| 38 | { |
| 39 | return (unsigned long)(div64_u64(bytes, sectorsize)); |
| 40 | } |
| 41 | |
| 42 | static inline u64 offset_to_bitmap(struct btrfs_block_group_cache *block_group, |
| 43 | u64 offset) |
| 44 | { |
| 45 | u64 bitmap_start; |
| 46 | u64 bytes_per_bitmap; |
| 47 | |
| 48 | bytes_per_bitmap = BITS_PER_BITMAP * block_group->sectorsize; |
| 49 | bitmap_start = offset - block_group->key.objectid; |
| 50 | bitmap_start = div64_u64(bitmap_start, bytes_per_bitmap); |
| 51 | bitmap_start *= bytes_per_bitmap; |
| 52 | bitmap_start += block_group->key.objectid; |
| 53 | |
| 54 | return bitmap_start; |
| 55 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 56 | |
| 57 | static int tree_insert_offset(struct rb_root *root, u64 offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 58 | struct rb_node *node, int bitmap) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 59 | { |
| 60 | struct rb_node **p = &root->rb_node; |
| 61 | struct rb_node *parent = NULL; |
| 62 | struct btrfs_free_space *info; |
| 63 | |
| 64 | while (*p) { |
| 65 | parent = *p; |
| 66 | info = rb_entry(parent, struct btrfs_free_space, offset_index); |
| 67 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 68 | if (offset < info->offset) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 69 | p = &(*p)->rb_left; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 70 | } else if (offset > info->offset) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 71 | p = &(*p)->rb_right; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 72 | } else { |
| 73 | /* |
| 74 | * we could have a bitmap entry and an extent entry |
| 75 | * share the same offset. If this is the case, we want |
| 76 | * the extent entry to always be found first if we do a |
| 77 | * linear search through the tree, since we want to have |
| 78 | * the quickest allocation time, and allocating from an |
| 79 | * extent is faster than allocating from a bitmap. So |
| 80 | * if we're inserting a bitmap and we find an entry at |
| 81 | * this offset, we want to go right, or after this entry |
| 82 | * logically. If we are inserting an extent and we've |
| 83 | * found a bitmap, we want to go left, or before |
| 84 | * logically. |
| 85 | */ |
| 86 | if (bitmap) { |
| 87 | WARN_ON(info->bitmap); |
| 88 | p = &(*p)->rb_right; |
| 89 | } else { |
| 90 | WARN_ON(!info->bitmap); |
| 91 | p = &(*p)->rb_left; |
| 92 | } |
| 93 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | rb_link_node(node, parent, p); |
| 97 | rb_insert_color(node, root); |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | /* |
Josef Bacik | 70cb074 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 103 | * searches the tree for the given offset. |
| 104 | * |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 105 | * fuzzy - If this is set, then we are trying to make an allocation, and we just |
| 106 | * want a section that has at least bytes size and comes at or after the given |
| 107 | * offset. |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 108 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 109 | static struct btrfs_free_space * |
| 110 | tree_search_offset(struct btrfs_block_group_cache *block_group, |
| 111 | u64 offset, int bitmap_only, int fuzzy) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 112 | { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 113 | struct rb_node *n = block_group->free_space_offset.rb_node; |
| 114 | struct btrfs_free_space *entry, *prev = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 115 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 116 | /* find entry that is closest to the 'offset' */ |
| 117 | while (1) { |
| 118 | if (!n) { |
| 119 | entry = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 120 | break; |
| 121 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 122 | |
| 123 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 124 | prev = entry; |
| 125 | |
| 126 | if (offset < entry->offset) |
| 127 | n = n->rb_left; |
| 128 | else if (offset > entry->offset) |
| 129 | n = n->rb_right; |
| 130 | else |
| 131 | break; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 132 | } |
| 133 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 134 | if (bitmap_only) { |
| 135 | if (!entry) |
| 136 | return NULL; |
| 137 | if (entry->bitmap) |
| 138 | return entry; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 139 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 140 | /* |
| 141 | * bitmap entry and extent entry may share same offset, |
| 142 | * in that case, bitmap entry comes after extent entry. |
| 143 | */ |
| 144 | n = rb_next(n); |
| 145 | if (!n) |
| 146 | return NULL; |
| 147 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 148 | if (entry->offset != offset) |
| 149 | return NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 150 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 151 | WARN_ON(!entry->bitmap); |
| 152 | return entry; |
| 153 | } else if (entry) { |
| 154 | if (entry->bitmap) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 155 | /* |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 156 | * if previous extent entry covers the offset, |
| 157 | * we should return it instead of the bitmap entry |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 158 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 159 | n = &entry->offset_index; |
| 160 | while (1) { |
| 161 | n = rb_prev(n); |
| 162 | if (!n) |
| 163 | break; |
| 164 | prev = rb_entry(n, struct btrfs_free_space, |
| 165 | offset_index); |
| 166 | if (!prev->bitmap) { |
| 167 | if (prev->offset + prev->bytes > offset) |
| 168 | entry = prev; |
| 169 | break; |
| 170 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 171 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 172 | } |
| 173 | return entry; |
| 174 | } |
| 175 | |
| 176 | if (!prev) |
| 177 | return NULL; |
| 178 | |
| 179 | /* find last entry before the 'offset' */ |
| 180 | entry = prev; |
| 181 | if (entry->offset > offset) { |
| 182 | n = rb_prev(&entry->offset_index); |
| 183 | if (n) { |
| 184 | entry = rb_entry(n, struct btrfs_free_space, |
| 185 | offset_index); |
| 186 | BUG_ON(entry->offset > offset); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 187 | } else { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 188 | if (fuzzy) |
| 189 | return entry; |
| 190 | else |
| 191 | return NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 192 | } |
| 193 | } |
| 194 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 195 | if (entry->bitmap) { |
| 196 | n = &entry->offset_index; |
| 197 | while (1) { |
| 198 | n = rb_prev(n); |
| 199 | if (!n) |
| 200 | break; |
| 201 | prev = rb_entry(n, struct btrfs_free_space, |
| 202 | offset_index); |
| 203 | if (!prev->bitmap) { |
| 204 | if (prev->offset + prev->bytes > offset) |
| 205 | return prev; |
| 206 | break; |
| 207 | } |
| 208 | } |
| 209 | if (entry->offset + BITS_PER_BITMAP * |
| 210 | block_group->sectorsize > offset) |
| 211 | return entry; |
| 212 | } else if (entry->offset + entry->bytes > offset) |
| 213 | return entry; |
| 214 | |
| 215 | if (!fuzzy) |
| 216 | return NULL; |
| 217 | |
| 218 | while (1) { |
| 219 | if (entry->bitmap) { |
| 220 | if (entry->offset + BITS_PER_BITMAP * |
| 221 | block_group->sectorsize > offset) |
| 222 | break; |
| 223 | } else { |
| 224 | if (entry->offset + entry->bytes > offset) |
| 225 | break; |
| 226 | } |
| 227 | |
| 228 | n = rb_next(&entry->offset_index); |
| 229 | if (!n) |
| 230 | return NULL; |
| 231 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 232 | } |
| 233 | return entry; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 234 | } |
| 235 | |
| 236 | static void unlink_free_space(struct btrfs_block_group_cache *block_group, |
| 237 | struct btrfs_free_space *info) |
| 238 | { |
| 239 | rb_erase(&info->offset_index, &block_group->free_space_offset); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 240 | block_group->free_extents--; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 241 | block_group->free_space -= info->bytes; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | static int link_free_space(struct btrfs_block_group_cache *block_group, |
| 245 | struct btrfs_free_space *info) |
| 246 | { |
| 247 | int ret = 0; |
| 248 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 249 | BUG_ON(!info->bitmap && !info->bytes); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 250 | ret = tree_insert_offset(&block_group->free_space_offset, info->offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 251 | &info->offset_index, (info->bitmap != NULL)); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 252 | if (ret) |
| 253 | return ret; |
| 254 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 255 | block_group->free_space += info->bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 256 | block_group->free_extents++; |
| 257 | return ret; |
| 258 | } |
| 259 | |
| 260 | static void recalculate_thresholds(struct btrfs_block_group_cache *block_group) |
| 261 | { |
| 262 | u64 max_bytes, possible_bytes; |
| 263 | |
| 264 | /* |
| 265 | * The goal is to keep the total amount of memory used per 1gb of space |
| 266 | * at or below 32k, so we need to adjust how much memory we allow to be |
| 267 | * used by extent based free space tracking |
| 268 | */ |
| 269 | max_bytes = MAX_CACHE_BYTES_PER_GIG * |
| 270 | (div64_u64(block_group->key.offset, 1024 * 1024 * 1024)); |
| 271 | |
| 272 | possible_bytes = (block_group->total_bitmaps * PAGE_CACHE_SIZE) + |
| 273 | (sizeof(struct btrfs_free_space) * |
| 274 | block_group->extents_thresh); |
| 275 | |
| 276 | if (possible_bytes > max_bytes) { |
| 277 | int extent_bytes = max_bytes - |
| 278 | (block_group->total_bitmaps * PAGE_CACHE_SIZE); |
| 279 | |
| 280 | if (extent_bytes <= 0) { |
| 281 | block_group->extents_thresh = 0; |
| 282 | return; |
| 283 | } |
| 284 | |
| 285 | block_group->extents_thresh = extent_bytes / |
| 286 | (sizeof(struct btrfs_free_space)); |
| 287 | } |
| 288 | } |
| 289 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 290 | static void bitmap_clear_bits(struct btrfs_block_group_cache *block_group, |
| 291 | struct btrfs_free_space *info, u64 offset, |
| 292 | u64 bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 293 | { |
| 294 | unsigned long start, end; |
| 295 | unsigned long i; |
| 296 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 297 | start = offset_to_bit(info->offset, block_group->sectorsize, offset); |
| 298 | end = start + bytes_to_bits(bytes, block_group->sectorsize); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 299 | BUG_ON(end > BITS_PER_BITMAP); |
| 300 | |
| 301 | for (i = start; i < end; i++) |
| 302 | clear_bit(i, info->bitmap); |
| 303 | |
| 304 | info->bytes -= bytes; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 305 | block_group->free_space -= bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 306 | } |
| 307 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 308 | static void bitmap_set_bits(struct btrfs_block_group_cache *block_group, |
| 309 | struct btrfs_free_space *info, u64 offset, |
| 310 | u64 bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 311 | { |
| 312 | unsigned long start, end; |
| 313 | unsigned long i; |
| 314 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 315 | start = offset_to_bit(info->offset, block_group->sectorsize, offset); |
| 316 | end = start + bytes_to_bits(bytes, block_group->sectorsize); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 317 | BUG_ON(end > BITS_PER_BITMAP); |
| 318 | |
| 319 | for (i = start; i < end; i++) |
| 320 | set_bit(i, info->bitmap); |
| 321 | |
| 322 | info->bytes += bytes; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 323 | block_group->free_space += bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 324 | } |
| 325 | |
| 326 | static int search_bitmap(struct btrfs_block_group_cache *block_group, |
| 327 | struct btrfs_free_space *bitmap_info, u64 *offset, |
| 328 | u64 *bytes) |
| 329 | { |
| 330 | unsigned long found_bits = 0; |
| 331 | unsigned long bits, i; |
| 332 | unsigned long next_zero; |
| 333 | |
| 334 | i = offset_to_bit(bitmap_info->offset, block_group->sectorsize, |
| 335 | max_t(u64, *offset, bitmap_info->offset)); |
| 336 | bits = bytes_to_bits(*bytes, block_group->sectorsize); |
| 337 | |
| 338 | for (i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i); |
| 339 | i < BITS_PER_BITMAP; |
| 340 | i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i + 1)) { |
| 341 | next_zero = find_next_zero_bit(bitmap_info->bitmap, |
| 342 | BITS_PER_BITMAP, i); |
| 343 | if ((next_zero - i) >= bits) { |
| 344 | found_bits = next_zero - i; |
| 345 | break; |
| 346 | } |
| 347 | i = next_zero; |
| 348 | } |
| 349 | |
| 350 | if (found_bits) { |
| 351 | *offset = (u64)(i * block_group->sectorsize) + |
| 352 | bitmap_info->offset; |
| 353 | *bytes = (u64)(found_bits) * block_group->sectorsize; |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | return -1; |
| 358 | } |
| 359 | |
| 360 | static struct btrfs_free_space *find_free_space(struct btrfs_block_group_cache |
| 361 | *block_group, u64 *offset, |
| 362 | u64 *bytes, int debug) |
| 363 | { |
| 364 | struct btrfs_free_space *entry; |
| 365 | struct rb_node *node; |
| 366 | int ret; |
| 367 | |
| 368 | if (!block_group->free_space_offset.rb_node) |
| 369 | return NULL; |
| 370 | |
| 371 | entry = tree_search_offset(block_group, |
| 372 | offset_to_bitmap(block_group, *offset), |
| 373 | 0, 1); |
| 374 | if (!entry) |
| 375 | return NULL; |
| 376 | |
| 377 | for (node = &entry->offset_index; node; node = rb_next(node)) { |
| 378 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 379 | if (entry->bytes < *bytes) |
| 380 | continue; |
| 381 | |
| 382 | if (entry->bitmap) { |
| 383 | ret = search_bitmap(block_group, entry, offset, bytes); |
| 384 | if (!ret) |
| 385 | return entry; |
| 386 | continue; |
| 387 | } |
| 388 | |
| 389 | *offset = entry->offset; |
| 390 | *bytes = entry->bytes; |
| 391 | return entry; |
| 392 | } |
| 393 | |
| 394 | return NULL; |
| 395 | } |
| 396 | |
| 397 | static void add_new_bitmap(struct btrfs_block_group_cache *block_group, |
| 398 | struct btrfs_free_space *info, u64 offset) |
| 399 | { |
| 400 | u64 bytes_per_bg = BITS_PER_BITMAP * block_group->sectorsize; |
| 401 | int max_bitmaps = (int)div64_u64(block_group->key.offset + |
| 402 | bytes_per_bg - 1, bytes_per_bg); |
| 403 | BUG_ON(block_group->total_bitmaps >= max_bitmaps); |
| 404 | |
| 405 | info->offset = offset_to_bitmap(block_group, offset); |
Josef Bacik | f019f42 | 2009-09-11 16:11:20 -0400 | [diff] [blame^] | 406 | info->bytes = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 407 | link_free_space(block_group, info); |
| 408 | block_group->total_bitmaps++; |
| 409 | |
| 410 | recalculate_thresholds(block_group); |
| 411 | } |
| 412 | |
| 413 | static noinline int remove_from_bitmap(struct btrfs_block_group_cache *block_group, |
| 414 | struct btrfs_free_space *bitmap_info, |
| 415 | u64 *offset, u64 *bytes) |
| 416 | { |
| 417 | u64 end; |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 418 | u64 search_start, search_bytes; |
| 419 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 420 | |
| 421 | again: |
| 422 | end = bitmap_info->offset + |
| 423 | (u64)(BITS_PER_BITMAP * block_group->sectorsize) - 1; |
| 424 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 425 | /* |
| 426 | * XXX - this can go away after a few releases. |
| 427 | * |
| 428 | * since the only user of btrfs_remove_free_space is the tree logging |
| 429 | * stuff, and the only way to test that is under crash conditions, we |
| 430 | * want to have this debug stuff here just in case somethings not |
| 431 | * working. Search the bitmap for the space we are trying to use to |
| 432 | * make sure its actually there. If its not there then we need to stop |
| 433 | * because something has gone wrong. |
| 434 | */ |
| 435 | search_start = *offset; |
| 436 | search_bytes = *bytes; |
| 437 | ret = search_bitmap(block_group, bitmap_info, &search_start, |
| 438 | &search_bytes); |
| 439 | BUG_ON(ret < 0 || search_start != *offset); |
| 440 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 441 | if (*offset > bitmap_info->offset && *offset + *bytes > end) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 442 | bitmap_clear_bits(block_group, bitmap_info, *offset, |
| 443 | end - *offset + 1); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 444 | *bytes -= end - *offset + 1; |
| 445 | *offset = end + 1; |
| 446 | } else if (*offset >= bitmap_info->offset && *offset + *bytes <= end) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 447 | bitmap_clear_bits(block_group, bitmap_info, *offset, *bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 448 | *bytes = 0; |
| 449 | } |
| 450 | |
| 451 | if (*bytes) { |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 452 | struct rb_node *next = rb_next(&bitmap_info->offset_index); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 453 | if (!bitmap_info->bytes) { |
| 454 | unlink_free_space(block_group, bitmap_info); |
| 455 | kfree(bitmap_info->bitmap); |
| 456 | kfree(bitmap_info); |
| 457 | block_group->total_bitmaps--; |
| 458 | recalculate_thresholds(block_group); |
| 459 | } |
| 460 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 461 | /* |
| 462 | * no entry after this bitmap, but we still have bytes to |
| 463 | * remove, so something has gone wrong. |
| 464 | */ |
| 465 | if (!next) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 466 | return -EINVAL; |
| 467 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 468 | bitmap_info = rb_entry(next, struct btrfs_free_space, |
| 469 | offset_index); |
| 470 | |
| 471 | /* |
| 472 | * if the next entry isn't a bitmap we need to return to let the |
| 473 | * extent stuff do its work. |
| 474 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 475 | if (!bitmap_info->bitmap) |
| 476 | return -EAGAIN; |
| 477 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 478 | /* |
| 479 | * Ok the next item is a bitmap, but it may not actually hold |
| 480 | * the information for the rest of this free space stuff, so |
| 481 | * look for it, and if we don't find it return so we can try |
| 482 | * everything over again. |
| 483 | */ |
| 484 | search_start = *offset; |
| 485 | search_bytes = *bytes; |
| 486 | ret = search_bitmap(block_group, bitmap_info, &search_start, |
| 487 | &search_bytes); |
| 488 | if (ret < 0 || search_start != *offset) |
| 489 | return -EAGAIN; |
| 490 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 491 | goto again; |
| 492 | } else if (!bitmap_info->bytes) { |
| 493 | unlink_free_space(block_group, bitmap_info); |
| 494 | kfree(bitmap_info->bitmap); |
| 495 | kfree(bitmap_info); |
| 496 | block_group->total_bitmaps--; |
| 497 | recalculate_thresholds(block_group); |
| 498 | } |
| 499 | |
| 500 | return 0; |
| 501 | } |
| 502 | |
| 503 | static int insert_into_bitmap(struct btrfs_block_group_cache *block_group, |
| 504 | struct btrfs_free_space *info) |
| 505 | { |
| 506 | struct btrfs_free_space *bitmap_info; |
| 507 | int added = 0; |
| 508 | u64 bytes, offset, end; |
| 509 | int ret; |
| 510 | |
| 511 | /* |
| 512 | * If we are below the extents threshold then we can add this as an |
| 513 | * extent, and don't have to deal with the bitmap |
| 514 | */ |
| 515 | if (block_group->free_extents < block_group->extents_thresh && |
| 516 | info->bytes > block_group->sectorsize * 4) |
| 517 | return 0; |
| 518 | |
| 519 | /* |
| 520 | * some block groups are so tiny they can't be enveloped by a bitmap, so |
| 521 | * don't even bother to create a bitmap for this |
| 522 | */ |
| 523 | if (BITS_PER_BITMAP * block_group->sectorsize > |
| 524 | block_group->key.offset) |
| 525 | return 0; |
| 526 | |
| 527 | bytes = info->bytes; |
| 528 | offset = info->offset; |
| 529 | |
| 530 | again: |
| 531 | bitmap_info = tree_search_offset(block_group, |
| 532 | offset_to_bitmap(block_group, offset), |
| 533 | 1, 0); |
| 534 | if (!bitmap_info) { |
| 535 | BUG_ON(added); |
| 536 | goto new_bitmap; |
| 537 | } |
| 538 | |
| 539 | end = bitmap_info->offset + |
| 540 | (u64)(BITS_PER_BITMAP * block_group->sectorsize); |
| 541 | |
| 542 | if (offset >= bitmap_info->offset && offset + bytes > end) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 543 | bitmap_set_bits(block_group, bitmap_info, offset, |
| 544 | end - offset); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 545 | bytes -= end - offset; |
| 546 | offset = end; |
| 547 | added = 0; |
| 548 | } else if (offset >= bitmap_info->offset && offset + bytes <= end) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 549 | bitmap_set_bits(block_group, bitmap_info, offset, bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 550 | bytes = 0; |
| 551 | } else { |
| 552 | BUG(); |
| 553 | } |
| 554 | |
| 555 | if (!bytes) { |
| 556 | ret = 1; |
| 557 | goto out; |
| 558 | } else |
| 559 | goto again; |
| 560 | |
| 561 | new_bitmap: |
| 562 | if (info && info->bitmap) { |
| 563 | add_new_bitmap(block_group, info, offset); |
| 564 | added = 1; |
| 565 | info = NULL; |
| 566 | goto again; |
| 567 | } else { |
| 568 | spin_unlock(&block_group->tree_lock); |
| 569 | |
| 570 | /* no pre-allocated info, allocate a new one */ |
| 571 | if (!info) { |
| 572 | info = kzalloc(sizeof(struct btrfs_free_space), |
| 573 | GFP_NOFS); |
| 574 | if (!info) { |
| 575 | spin_lock(&block_group->tree_lock); |
| 576 | ret = -ENOMEM; |
| 577 | goto out; |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | /* allocate the bitmap */ |
| 582 | info->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
| 583 | spin_lock(&block_group->tree_lock); |
| 584 | if (!info->bitmap) { |
| 585 | ret = -ENOMEM; |
| 586 | goto out; |
| 587 | } |
| 588 | goto again; |
| 589 | } |
| 590 | |
| 591 | out: |
| 592 | if (info) { |
| 593 | if (info->bitmap) |
| 594 | kfree(info->bitmap); |
| 595 | kfree(info); |
| 596 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 597 | |
| 598 | return ret; |
| 599 | } |
| 600 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 601 | int btrfs_add_free_space(struct btrfs_block_group_cache *block_group, |
| 602 | u64 offset, u64 bytes) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 603 | { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 604 | struct btrfs_free_space *right_info = NULL; |
| 605 | struct btrfs_free_space *left_info = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 606 | struct btrfs_free_space *info = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 607 | int ret = 0; |
| 608 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 609 | info = kzalloc(sizeof(struct btrfs_free_space), GFP_NOFS); |
| 610 | if (!info) |
| 611 | return -ENOMEM; |
| 612 | |
| 613 | info->offset = offset; |
| 614 | info->bytes = bytes; |
| 615 | |
| 616 | spin_lock(&block_group->tree_lock); |
| 617 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 618 | /* |
| 619 | * first we want to see if there is free space adjacent to the range we |
| 620 | * are adding, if there is remove that struct and add a new one to |
| 621 | * cover the entire range |
| 622 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 623 | right_info = tree_search_offset(block_group, offset + bytes, 0, 0); |
| 624 | if (right_info && rb_prev(&right_info->offset_index)) |
| 625 | left_info = rb_entry(rb_prev(&right_info->offset_index), |
| 626 | struct btrfs_free_space, offset_index); |
| 627 | else |
| 628 | left_info = tree_search_offset(block_group, offset - 1, 0, 0); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 629 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 630 | /* |
| 631 | * If there was no extent directly to the left or right of this new |
| 632 | * extent then we know we're going to have to allocate a new extent, so |
| 633 | * before we do that see if we need to drop this into a bitmap |
| 634 | */ |
| 635 | if ((!left_info || left_info->bitmap) && |
| 636 | (!right_info || right_info->bitmap)) { |
| 637 | ret = insert_into_bitmap(block_group, info); |
| 638 | |
| 639 | if (ret < 0) { |
| 640 | goto out; |
| 641 | } else if (ret) { |
| 642 | ret = 0; |
| 643 | goto out; |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | if (right_info && !right_info->bitmap) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 648 | unlink_free_space(block_group, right_info); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 649 | info->bytes += right_info->bytes; |
| 650 | kfree(right_info); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 651 | } |
| 652 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 653 | if (left_info && !left_info->bitmap && |
| 654 | left_info->offset + left_info->bytes == offset) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 655 | unlink_free_space(block_group, left_info); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 656 | info->offset = left_info->offset; |
| 657 | info->bytes += left_info->bytes; |
| 658 | kfree(left_info); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 659 | } |
| 660 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 661 | ret = link_free_space(block_group, info); |
| 662 | if (ret) |
| 663 | kfree(info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 664 | out: |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 665 | spin_unlock(&block_group->tree_lock); |
| 666 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 667 | if (ret) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 668 | printk(KERN_CRIT "btrfs: unable to add free space :%d\n", ret); |
Stoyan Gaydarov | c293498 | 2009-04-02 17:05:11 -0400 | [diff] [blame] | 669 | BUG_ON(ret == -EEXIST); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 670 | } |
| 671 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 672 | return ret; |
| 673 | } |
| 674 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 675 | int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, |
| 676 | u64 offset, u64 bytes) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 677 | { |
| 678 | struct btrfs_free_space *info; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 679 | struct btrfs_free_space *next_info = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 680 | int ret = 0; |
| 681 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 682 | spin_lock(&block_group->tree_lock); |
| 683 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 684 | again: |
| 685 | info = tree_search_offset(block_group, offset, 0, 0); |
| 686 | if (!info) { |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 687 | /* |
| 688 | * oops didn't find an extent that matched the space we wanted |
| 689 | * to remove, look for a bitmap instead |
| 690 | */ |
| 691 | info = tree_search_offset(block_group, |
| 692 | offset_to_bitmap(block_group, offset), |
| 693 | 1, 0); |
| 694 | if (!info) { |
| 695 | WARN_ON(1); |
| 696 | goto out_lock; |
| 697 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 698 | } |
| 699 | |
| 700 | if (info->bytes < bytes && rb_next(&info->offset_index)) { |
| 701 | u64 end; |
| 702 | next_info = rb_entry(rb_next(&info->offset_index), |
| 703 | struct btrfs_free_space, |
| 704 | offset_index); |
| 705 | |
| 706 | if (next_info->bitmap) |
| 707 | end = next_info->offset + BITS_PER_BITMAP * |
| 708 | block_group->sectorsize - 1; |
| 709 | else |
| 710 | end = next_info->offset + next_info->bytes; |
| 711 | |
| 712 | if (next_info->bytes < bytes || |
| 713 | next_info->offset > offset || offset > end) { |
| 714 | printk(KERN_CRIT "Found free space at %llu, size %llu," |
| 715 | " trying to use %llu\n", |
| 716 | (unsigned long long)info->offset, |
| 717 | (unsigned long long)info->bytes, |
| 718 | (unsigned long long)bytes); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 719 | WARN_ON(1); |
| 720 | ret = -EINVAL; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 721 | goto out_lock; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 722 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 723 | |
| 724 | info = next_info; |
| 725 | } |
| 726 | |
| 727 | if (info->bytes == bytes) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 728 | unlink_free_space(block_group, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 729 | if (info->bitmap) { |
| 730 | kfree(info->bitmap); |
| 731 | block_group->total_bitmaps--; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 732 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 733 | kfree(info); |
| 734 | goto out_lock; |
| 735 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 736 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 737 | if (!info->bitmap && info->offset == offset) { |
| 738 | unlink_free_space(block_group, info); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 739 | info->offset += bytes; |
| 740 | info->bytes -= bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 741 | link_free_space(block_group, info); |
| 742 | goto out_lock; |
| 743 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 744 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 745 | if (!info->bitmap && info->offset <= offset && |
| 746 | info->offset + info->bytes >= offset + bytes) { |
Chris Mason | 9b49c9b | 2008-09-24 11:23:25 -0400 | [diff] [blame] | 747 | u64 old_start = info->offset; |
| 748 | /* |
| 749 | * we're freeing space in the middle of the info, |
| 750 | * this can happen during tree log replay |
| 751 | * |
| 752 | * first unlink the old info and then |
| 753 | * insert it again after the hole we're creating |
| 754 | */ |
| 755 | unlink_free_space(block_group, info); |
| 756 | if (offset + bytes < info->offset + info->bytes) { |
| 757 | u64 old_end = info->offset + info->bytes; |
| 758 | |
| 759 | info->offset = offset + bytes; |
| 760 | info->bytes = old_end - info->offset; |
| 761 | ret = link_free_space(block_group, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 762 | WARN_ON(ret); |
| 763 | if (ret) |
| 764 | goto out_lock; |
Chris Mason | 9b49c9b | 2008-09-24 11:23:25 -0400 | [diff] [blame] | 765 | } else { |
| 766 | /* the hole we're creating ends at the end |
| 767 | * of the info struct, just free the info |
| 768 | */ |
| 769 | kfree(info); |
| 770 | } |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 771 | spin_unlock(&block_group->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 772 | |
| 773 | /* step two, insert a new info struct to cover |
| 774 | * anything before the hole |
Chris Mason | 9b49c9b | 2008-09-24 11:23:25 -0400 | [diff] [blame] | 775 | */ |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 776 | ret = btrfs_add_free_space(block_group, old_start, |
| 777 | offset - old_start); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 778 | WARN_ON(ret); |
| 779 | goto out; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 780 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 781 | |
| 782 | ret = remove_from_bitmap(block_group, info, &offset, &bytes); |
| 783 | if (ret == -EAGAIN) |
| 784 | goto again; |
| 785 | BUG_ON(ret); |
| 786 | out_lock: |
| 787 | spin_unlock(&block_group->tree_lock); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 788 | out: |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 789 | return ret; |
| 790 | } |
| 791 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 792 | void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, |
| 793 | u64 bytes) |
| 794 | { |
| 795 | struct btrfs_free_space *info; |
| 796 | struct rb_node *n; |
| 797 | int count = 0; |
| 798 | |
| 799 | for (n = rb_first(&block_group->free_space_offset); n; n = rb_next(n)) { |
| 800 | info = rb_entry(n, struct btrfs_free_space, offset_index); |
| 801 | if (info->bytes >= bytes) |
| 802 | count++; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 803 | printk(KERN_CRIT "entry offset %llu, bytes %llu, bitmap %s\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 804 | (unsigned long long)info->offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 805 | (unsigned long long)info->bytes, |
| 806 | (info->bitmap) ? "yes" : "no"); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 807 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 808 | printk(KERN_INFO "block group has cluster?: %s\n", |
| 809 | list_empty(&block_group->cluster_list) ? "no" : "yes"); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 810 | printk(KERN_INFO "%d blocks of free space at or bigger than bytes is" |
| 811 | "\n", count); |
| 812 | } |
| 813 | |
| 814 | u64 btrfs_block_group_free_space(struct btrfs_block_group_cache *block_group) |
| 815 | { |
| 816 | struct btrfs_free_space *info; |
| 817 | struct rb_node *n; |
| 818 | u64 ret = 0; |
| 819 | |
| 820 | for (n = rb_first(&block_group->free_space_offset); n; |
| 821 | n = rb_next(n)) { |
| 822 | info = rb_entry(n, struct btrfs_free_space, offset_index); |
| 823 | ret += info->bytes; |
| 824 | } |
| 825 | |
| 826 | return ret; |
| 827 | } |
| 828 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 829 | /* |
| 830 | * for a given cluster, put all of its extents back into the free |
| 831 | * space cache. If the block group passed doesn't match the block group |
| 832 | * pointed to by the cluster, someone else raced in and freed the |
| 833 | * cluster already. In that case, we just return without changing anything |
| 834 | */ |
| 835 | static int |
| 836 | __btrfs_return_cluster_to_free_space( |
| 837 | struct btrfs_block_group_cache *block_group, |
| 838 | struct btrfs_free_cluster *cluster) |
| 839 | { |
| 840 | struct btrfs_free_space *entry; |
| 841 | struct rb_node *node; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 842 | bool bitmap; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 843 | |
| 844 | spin_lock(&cluster->lock); |
| 845 | if (cluster->block_group != block_group) |
| 846 | goto out; |
| 847 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 848 | bitmap = cluster->points_to_bitmap; |
| 849 | cluster->block_group = NULL; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 850 | cluster->window_start = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 851 | list_del_init(&cluster->block_group_list); |
| 852 | cluster->points_to_bitmap = false; |
| 853 | |
| 854 | if (bitmap) |
| 855 | goto out; |
| 856 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 857 | node = rb_first(&cluster->root); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 858 | while (node) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 859 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 860 | node = rb_next(&entry->offset_index); |
| 861 | rb_erase(&entry->offset_index, &cluster->root); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 862 | BUG_ON(entry->bitmap); |
| 863 | tree_insert_offset(&block_group->free_space_offset, |
| 864 | entry->offset, &entry->offset_index, 0); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 865 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 866 | cluster->root.rb_node = NULL; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 867 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 868 | out: |
| 869 | spin_unlock(&cluster->lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 870 | btrfs_put_block_group(block_group); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 871 | return 0; |
| 872 | } |
| 873 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 874 | void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group) |
| 875 | { |
| 876 | struct btrfs_free_space *info; |
| 877 | struct rb_node *node; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 878 | struct btrfs_free_cluster *cluster; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 879 | struct list_head *head; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 880 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 881 | spin_lock(&block_group->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 882 | while ((head = block_group->cluster_list.next) != |
| 883 | &block_group->cluster_list) { |
| 884 | cluster = list_entry(head, struct btrfs_free_cluster, |
| 885 | block_group_list); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 886 | |
| 887 | WARN_ON(cluster->block_group != block_group); |
| 888 | __btrfs_return_cluster_to_free_space(block_group, cluster); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 889 | if (need_resched()) { |
| 890 | spin_unlock(&block_group->tree_lock); |
| 891 | cond_resched(); |
| 892 | spin_lock(&block_group->tree_lock); |
| 893 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 894 | } |
| 895 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 896 | while ((node = rb_last(&block_group->free_space_offset)) != NULL) { |
| 897 | info = rb_entry(node, struct btrfs_free_space, offset_index); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 898 | unlink_free_space(block_group, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 899 | if (info->bitmap) |
| 900 | kfree(info->bitmap); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 901 | kfree(info); |
| 902 | if (need_resched()) { |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 903 | spin_unlock(&block_group->tree_lock); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 904 | cond_resched(); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 905 | spin_lock(&block_group->tree_lock); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 906 | } |
| 907 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 908 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 909 | spin_unlock(&block_group->tree_lock); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 910 | } |
| 911 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 912 | u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, |
| 913 | u64 offset, u64 bytes, u64 empty_size) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 914 | { |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 915 | struct btrfs_free_space *entry = NULL; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 916 | u64 bytes_search = bytes + empty_size; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 917 | u64 ret = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 918 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 919 | spin_lock(&block_group->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 920 | entry = find_free_space(block_group, &offset, &bytes_search, 0); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 921 | if (!entry) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 922 | goto out; |
| 923 | |
| 924 | ret = offset; |
| 925 | if (entry->bitmap) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 926 | bitmap_clear_bits(block_group, entry, offset, bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 927 | if (!entry->bytes) { |
| 928 | unlink_free_space(block_group, entry); |
| 929 | kfree(entry->bitmap); |
| 930 | kfree(entry); |
| 931 | block_group->total_bitmaps--; |
| 932 | recalculate_thresholds(block_group); |
| 933 | } |
| 934 | } else { |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 935 | unlink_free_space(block_group, entry); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 936 | entry->offset += bytes; |
| 937 | entry->bytes -= bytes; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 938 | if (!entry->bytes) |
| 939 | kfree(entry); |
| 940 | else |
| 941 | link_free_space(block_group, entry); |
| 942 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 943 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 944 | out: |
| 945 | spin_unlock(&block_group->tree_lock); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 946 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 947 | return ret; |
| 948 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 949 | |
| 950 | /* |
| 951 | * given a cluster, put all of its extents back into the free space |
| 952 | * cache. If a block group is passed, this function will only free |
| 953 | * a cluster that belongs to the passed block group. |
| 954 | * |
| 955 | * Otherwise, it'll get a reference on the block group pointed to by the |
| 956 | * cluster and remove the cluster from it. |
| 957 | */ |
| 958 | int btrfs_return_cluster_to_free_space( |
| 959 | struct btrfs_block_group_cache *block_group, |
| 960 | struct btrfs_free_cluster *cluster) |
| 961 | { |
| 962 | int ret; |
| 963 | |
| 964 | /* first, get a safe pointer to the block group */ |
| 965 | spin_lock(&cluster->lock); |
| 966 | if (!block_group) { |
| 967 | block_group = cluster->block_group; |
| 968 | if (!block_group) { |
| 969 | spin_unlock(&cluster->lock); |
| 970 | return 0; |
| 971 | } |
| 972 | } else if (cluster->block_group != block_group) { |
| 973 | /* someone else has already freed it don't redo their work */ |
| 974 | spin_unlock(&cluster->lock); |
| 975 | return 0; |
| 976 | } |
| 977 | atomic_inc(&block_group->count); |
| 978 | spin_unlock(&cluster->lock); |
| 979 | |
| 980 | /* now return any extents the cluster had on it */ |
| 981 | spin_lock(&block_group->tree_lock); |
| 982 | ret = __btrfs_return_cluster_to_free_space(block_group, cluster); |
| 983 | spin_unlock(&block_group->tree_lock); |
| 984 | |
| 985 | /* finally drop our ref */ |
| 986 | btrfs_put_block_group(block_group); |
| 987 | return ret; |
| 988 | } |
| 989 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 990 | static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, |
| 991 | struct btrfs_free_cluster *cluster, |
| 992 | u64 bytes, u64 min_start) |
| 993 | { |
| 994 | struct btrfs_free_space *entry; |
| 995 | int err; |
| 996 | u64 search_start = cluster->window_start; |
| 997 | u64 search_bytes = bytes; |
| 998 | u64 ret = 0; |
| 999 | |
| 1000 | spin_lock(&block_group->tree_lock); |
| 1001 | spin_lock(&cluster->lock); |
| 1002 | |
| 1003 | if (!cluster->points_to_bitmap) |
| 1004 | goto out; |
| 1005 | |
| 1006 | if (cluster->block_group != block_group) |
| 1007 | goto out; |
| 1008 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1009 | /* |
| 1010 | * search_start is the beginning of the bitmap, but at some point it may |
| 1011 | * be a good idea to point to the actual start of the free area in the |
| 1012 | * bitmap, so do the offset_to_bitmap trick anyway, and set bitmap_only |
| 1013 | * to 1 to make sure we get the bitmap entry |
| 1014 | */ |
| 1015 | entry = tree_search_offset(block_group, |
| 1016 | offset_to_bitmap(block_group, search_start), |
| 1017 | 1, 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1018 | if (!entry || !entry->bitmap) |
| 1019 | goto out; |
| 1020 | |
| 1021 | search_start = min_start; |
| 1022 | search_bytes = bytes; |
| 1023 | |
| 1024 | err = search_bitmap(block_group, entry, &search_start, |
| 1025 | &search_bytes); |
| 1026 | if (err) |
| 1027 | goto out; |
| 1028 | |
| 1029 | ret = search_start; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1030 | bitmap_clear_bits(block_group, entry, ret, bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1031 | out: |
| 1032 | spin_unlock(&cluster->lock); |
| 1033 | spin_unlock(&block_group->tree_lock); |
| 1034 | |
| 1035 | return ret; |
| 1036 | } |
| 1037 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1038 | /* |
| 1039 | * given a cluster, try to allocate 'bytes' from it, returns 0 |
| 1040 | * if it couldn't find anything suitably large, or a logical disk offset |
| 1041 | * if things worked out |
| 1042 | */ |
| 1043 | u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, |
| 1044 | struct btrfs_free_cluster *cluster, u64 bytes, |
| 1045 | u64 min_start) |
| 1046 | { |
| 1047 | struct btrfs_free_space *entry = NULL; |
| 1048 | struct rb_node *node; |
| 1049 | u64 ret = 0; |
| 1050 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1051 | if (cluster->points_to_bitmap) |
| 1052 | return btrfs_alloc_from_bitmap(block_group, cluster, bytes, |
| 1053 | min_start); |
| 1054 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1055 | spin_lock(&cluster->lock); |
| 1056 | if (bytes > cluster->max_size) |
| 1057 | goto out; |
| 1058 | |
| 1059 | if (cluster->block_group != block_group) |
| 1060 | goto out; |
| 1061 | |
| 1062 | node = rb_first(&cluster->root); |
| 1063 | if (!node) |
| 1064 | goto out; |
| 1065 | |
| 1066 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 1067 | |
| 1068 | while(1) { |
| 1069 | if (entry->bytes < bytes || entry->offset < min_start) { |
| 1070 | struct rb_node *node; |
| 1071 | |
| 1072 | node = rb_next(&entry->offset_index); |
| 1073 | if (!node) |
| 1074 | break; |
| 1075 | entry = rb_entry(node, struct btrfs_free_space, |
| 1076 | offset_index); |
| 1077 | continue; |
| 1078 | } |
| 1079 | ret = entry->offset; |
| 1080 | |
| 1081 | entry->offset += bytes; |
| 1082 | entry->bytes -= bytes; |
| 1083 | |
| 1084 | if (entry->bytes == 0) { |
| 1085 | rb_erase(&entry->offset_index, &cluster->root); |
| 1086 | kfree(entry); |
| 1087 | } |
| 1088 | break; |
| 1089 | } |
| 1090 | out: |
| 1091 | spin_unlock(&cluster->lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1092 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1093 | return ret; |
| 1094 | } |
| 1095 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1096 | static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group, |
| 1097 | struct btrfs_free_space *entry, |
| 1098 | struct btrfs_free_cluster *cluster, |
| 1099 | u64 offset, u64 bytes, u64 min_bytes) |
| 1100 | { |
| 1101 | unsigned long next_zero; |
| 1102 | unsigned long i; |
| 1103 | unsigned long search_bits; |
| 1104 | unsigned long total_bits; |
| 1105 | unsigned long found_bits; |
| 1106 | unsigned long start = 0; |
| 1107 | unsigned long total_found = 0; |
| 1108 | bool found = false; |
| 1109 | |
| 1110 | i = offset_to_bit(entry->offset, block_group->sectorsize, |
| 1111 | max_t(u64, offset, entry->offset)); |
| 1112 | search_bits = bytes_to_bits(min_bytes, block_group->sectorsize); |
| 1113 | total_bits = bytes_to_bits(bytes, block_group->sectorsize); |
| 1114 | |
| 1115 | again: |
| 1116 | found_bits = 0; |
| 1117 | for (i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i); |
| 1118 | i < BITS_PER_BITMAP; |
| 1119 | i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i + 1)) { |
| 1120 | next_zero = find_next_zero_bit(entry->bitmap, |
| 1121 | BITS_PER_BITMAP, i); |
| 1122 | if (next_zero - i >= search_bits) { |
| 1123 | found_bits = next_zero - i; |
| 1124 | break; |
| 1125 | } |
| 1126 | i = next_zero; |
| 1127 | } |
| 1128 | |
| 1129 | if (!found_bits) |
| 1130 | return -1; |
| 1131 | |
| 1132 | if (!found) { |
| 1133 | start = i; |
| 1134 | found = true; |
| 1135 | } |
| 1136 | |
| 1137 | total_found += found_bits; |
| 1138 | |
| 1139 | if (cluster->max_size < found_bits * block_group->sectorsize) |
| 1140 | cluster->max_size = found_bits * block_group->sectorsize; |
| 1141 | |
| 1142 | if (total_found < total_bits) { |
| 1143 | i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, next_zero); |
| 1144 | if (i - start > total_bits * 2) { |
| 1145 | total_found = 0; |
| 1146 | cluster->max_size = 0; |
| 1147 | found = false; |
| 1148 | } |
| 1149 | goto again; |
| 1150 | } |
| 1151 | |
| 1152 | cluster->window_start = start * block_group->sectorsize + |
| 1153 | entry->offset; |
| 1154 | cluster->points_to_bitmap = true; |
| 1155 | |
| 1156 | return 0; |
| 1157 | } |
| 1158 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1159 | /* |
| 1160 | * here we try to find a cluster of blocks in a block group. The goal |
| 1161 | * is to find at least bytes free and up to empty_size + bytes free. |
| 1162 | * We might not find them all in one contiguous area. |
| 1163 | * |
| 1164 | * returns zero and sets up cluster if things worked out, otherwise |
| 1165 | * it returns -enospc |
| 1166 | */ |
| 1167 | int btrfs_find_space_cluster(struct btrfs_trans_handle *trans, |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 1168 | struct btrfs_root *root, |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1169 | struct btrfs_block_group_cache *block_group, |
| 1170 | struct btrfs_free_cluster *cluster, |
| 1171 | u64 offset, u64 bytes, u64 empty_size) |
| 1172 | { |
| 1173 | struct btrfs_free_space *entry = NULL; |
| 1174 | struct rb_node *node; |
| 1175 | struct btrfs_free_space *next; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1176 | struct btrfs_free_space *last = NULL; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1177 | u64 min_bytes; |
| 1178 | u64 window_start; |
| 1179 | u64 window_free; |
| 1180 | u64 max_extent = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1181 | bool found_bitmap = false; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1182 | int ret; |
| 1183 | |
| 1184 | /* for metadata, allow allocates with more holes */ |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 1185 | if (btrfs_test_opt(root, SSD_SPREAD)) { |
| 1186 | min_bytes = bytes + empty_size; |
| 1187 | } else if (block_group->flags & BTRFS_BLOCK_GROUP_METADATA) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1188 | /* |
| 1189 | * we want to do larger allocations when we are |
| 1190 | * flushing out the delayed refs, it helps prevent |
| 1191 | * making more work as we go along. |
| 1192 | */ |
| 1193 | if (trans->transaction->delayed_refs.flushing) |
| 1194 | min_bytes = max(bytes, (bytes + empty_size) >> 1); |
| 1195 | else |
| 1196 | min_bytes = max(bytes, (bytes + empty_size) >> 4); |
| 1197 | } else |
| 1198 | min_bytes = max(bytes, (bytes + empty_size) >> 2); |
| 1199 | |
| 1200 | spin_lock(&block_group->tree_lock); |
| 1201 | spin_lock(&cluster->lock); |
| 1202 | |
| 1203 | /* someone already found a cluster, hooray */ |
| 1204 | if (cluster->block_group) { |
| 1205 | ret = 0; |
| 1206 | goto out; |
| 1207 | } |
| 1208 | again: |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1209 | entry = tree_search_offset(block_group, offset, found_bitmap, 1); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1210 | if (!entry) { |
| 1211 | ret = -ENOSPC; |
| 1212 | goto out; |
| 1213 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1214 | |
| 1215 | /* |
| 1216 | * If found_bitmap is true, we exhausted our search for extent entries, |
| 1217 | * and we just want to search all of the bitmaps that we can find, and |
| 1218 | * ignore any extent entries we find. |
| 1219 | */ |
| 1220 | while (entry->bitmap || found_bitmap || |
| 1221 | (!entry->bitmap && entry->bytes < min_bytes)) { |
| 1222 | struct rb_node *node = rb_next(&entry->offset_index); |
| 1223 | |
| 1224 | if (entry->bitmap && entry->bytes > bytes + empty_size) { |
| 1225 | ret = btrfs_bitmap_cluster(block_group, entry, cluster, |
| 1226 | offset, bytes + empty_size, |
| 1227 | min_bytes); |
| 1228 | if (!ret) |
| 1229 | goto got_it; |
| 1230 | } |
| 1231 | |
| 1232 | if (!node) { |
| 1233 | ret = -ENOSPC; |
| 1234 | goto out; |
| 1235 | } |
| 1236 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 1237 | } |
| 1238 | |
| 1239 | /* |
| 1240 | * We already searched all the extent entries from the passed in offset |
| 1241 | * to the end and didn't find enough space for the cluster, and we also |
| 1242 | * didn't find any bitmaps that met our criteria, just go ahead and exit |
| 1243 | */ |
| 1244 | if (found_bitmap) { |
| 1245 | ret = -ENOSPC; |
| 1246 | goto out; |
| 1247 | } |
| 1248 | |
| 1249 | cluster->points_to_bitmap = false; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1250 | window_start = entry->offset; |
| 1251 | window_free = entry->bytes; |
| 1252 | last = entry; |
| 1253 | max_extent = entry->bytes; |
| 1254 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1255 | while (1) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1256 | /* out window is just right, lets fill it */ |
| 1257 | if (window_free >= bytes + empty_size) |
| 1258 | break; |
| 1259 | |
| 1260 | node = rb_next(&last->offset_index); |
| 1261 | if (!node) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1262 | if (found_bitmap) |
| 1263 | goto again; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1264 | ret = -ENOSPC; |
| 1265 | goto out; |
| 1266 | } |
| 1267 | next = rb_entry(node, struct btrfs_free_space, offset_index); |
| 1268 | |
| 1269 | /* |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1270 | * we found a bitmap, so if this search doesn't result in a |
| 1271 | * cluster, we know to go and search again for the bitmaps and |
| 1272 | * start looking for space there |
| 1273 | */ |
| 1274 | if (next->bitmap) { |
| 1275 | if (!found_bitmap) |
| 1276 | offset = next->offset; |
| 1277 | found_bitmap = true; |
| 1278 | last = next; |
| 1279 | continue; |
| 1280 | } |
| 1281 | |
| 1282 | /* |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1283 | * we haven't filled the empty size and the window is |
| 1284 | * very large. reset and try again |
| 1285 | */ |
Chris Mason | c604480 | 2009-06-09 18:35:15 -0400 | [diff] [blame] | 1286 | if (next->offset - (last->offset + last->bytes) > 128 * 1024 || |
| 1287 | next->offset - window_start > (bytes + empty_size) * 2) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1288 | entry = next; |
| 1289 | window_start = entry->offset; |
| 1290 | window_free = entry->bytes; |
| 1291 | last = entry; |
| 1292 | max_extent = 0; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1293 | } else { |
| 1294 | last = next; |
| 1295 | window_free += next->bytes; |
| 1296 | if (entry->bytes > max_extent) |
| 1297 | max_extent = entry->bytes; |
| 1298 | } |
| 1299 | } |
| 1300 | |
| 1301 | cluster->window_start = entry->offset; |
| 1302 | |
| 1303 | /* |
| 1304 | * now we've found our entries, pull them out of the free space |
| 1305 | * cache and put them into the cluster rbtree |
| 1306 | * |
| 1307 | * The cluster includes an rbtree, but only uses the offset index |
| 1308 | * of each free space cache entry. |
| 1309 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1310 | while (1) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1311 | node = rb_next(&entry->offset_index); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1312 | if (entry->bitmap && node) { |
| 1313 | entry = rb_entry(node, struct btrfs_free_space, |
| 1314 | offset_index); |
| 1315 | continue; |
| 1316 | } else if (entry->bitmap && !node) { |
| 1317 | break; |
| 1318 | } |
| 1319 | |
| 1320 | rb_erase(&entry->offset_index, &block_group->free_space_offset); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1321 | ret = tree_insert_offset(&cluster->root, entry->offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1322 | &entry->offset_index, 0); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1323 | BUG_ON(ret); |
| 1324 | |
| 1325 | if (!node || entry == last) |
| 1326 | break; |
| 1327 | |
| 1328 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 1329 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1330 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1331 | cluster->max_size = max_extent; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1332 | got_it: |
| 1333 | ret = 0; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1334 | atomic_inc(&block_group->count); |
| 1335 | list_add_tail(&cluster->block_group_list, &block_group->cluster_list); |
| 1336 | cluster->block_group = block_group; |
| 1337 | out: |
| 1338 | spin_unlock(&cluster->lock); |
| 1339 | spin_unlock(&block_group->tree_lock); |
| 1340 | |
| 1341 | return ret; |
| 1342 | } |
| 1343 | |
| 1344 | /* |
| 1345 | * simple code to zero out a cluster |
| 1346 | */ |
| 1347 | void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) |
| 1348 | { |
| 1349 | spin_lock_init(&cluster->lock); |
| 1350 | spin_lock_init(&cluster->refill_lock); |
| 1351 | cluster->root.rb_node = NULL; |
| 1352 | cluster->max_size = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1353 | cluster->points_to_bitmap = false; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 1354 | INIT_LIST_HEAD(&cluster->block_group_list); |
| 1355 | cluster->block_group = NULL; |
| 1356 | } |
| 1357 | |