| 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. 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 | |
| 19 | #include <linux/fs.h> |
| 20 | #include <linux/blkdev.h> |
| 21 | #include <linux/scatterlist.h> |
| 22 | #include <linux/swap.h> |
| 23 | #include <linux/radix-tree.h> |
| 24 | #include <linux/writeback.h> |
| 25 | #include <linux/buffer_head.h> |
| 26 | #include <linux/workqueue.h> |
| 27 | #include <linux/kthread.h> |
| 28 | #include <linux/freezer.h> |
| 29 | #include <linux/crc32c.h> |
| 30 | #include <linux/slab.h> |
| 31 | #include <linux/migrate.h> |
| 32 | #include "compat.h" |
| 33 | #include "ctree.h" |
| 34 | #include "disk-io.h" |
| 35 | #include "transaction.h" |
| 36 | #include "btrfs_inode.h" |
| 37 | #include "volumes.h" |
| 38 | #include "print-tree.h" |
| 39 | #include "async-thread.h" |
| 40 | #include "locking.h" |
| 41 | #include "tree-log.h" |
| 42 | #include "free-space-cache.h" |
| 43 | |
| 44 | static struct extent_io_ops btree_extent_io_ops; |
| 45 | static void end_workqueue_fn(struct btrfs_work *work); |
| 46 | static void free_fs_root(struct btrfs_root *root); |
| 47 | |
| 48 | /* |
| 49 | * end_io_wq structs are used to do processing in task context when an IO is |
| 50 | * complete. This is used during reads to verify checksums, and it is used |
| 51 | * by writes to insert metadata for new file extents after IO is complete. |
| 52 | */ |
| 53 | struct end_io_wq { |
| 54 | struct bio *bio; |
| 55 | bio_end_io_t *end_io; |
| 56 | void *private; |
| 57 | struct btrfs_fs_info *info; |
| 58 | int error; |
| 59 | int metadata; |
| 60 | struct list_head list; |
| 61 | struct btrfs_work work; |
| 62 | }; |
| 63 | |
| 64 | /* |
| 65 | * async submit bios are used to offload expensive checksumming |
| 66 | * onto the worker threads. They checksum file and metadata bios |
| 67 | * just before they are sent down the IO stack. |
| 68 | */ |
| 69 | struct async_submit_bio { |
| 70 | struct inode *inode; |
| 71 | struct bio *bio; |
| 72 | struct list_head list; |
| 73 | extent_submit_bio_hook_t *submit_bio_start; |
| 74 | extent_submit_bio_hook_t *submit_bio_done; |
| 75 | int rw; |
| 76 | int mirror_num; |
| 77 | unsigned long bio_flags; |
| 78 | /* |
| 79 | * bio_offset is optional, can be used if the pages in the bio |
| 80 | * can't tell us where in the file the bio should go |
| 81 | */ |
| 82 | u64 bio_offset; |
| 83 | struct btrfs_work work; |
| 84 | }; |
| 85 | |
| 86 | /* These are used to set the lockdep class on the extent buffer locks. |
| 87 | * The class is set by the readpage_end_io_hook after the buffer has |
| 88 | * passed csum validation but before the pages are unlocked. |
| 89 | * |
| 90 | * The lockdep class is also set by btrfs_init_new_buffer on freshly |
| 91 | * allocated blocks. |
| 92 | * |
| 93 | * The class is based on the level in the tree block, which allows lockdep |
| 94 | * to know that lower nodes nest inside the locks of higher nodes. |
| 95 | * |
| 96 | * We also add a check to make sure the highest level of the tree is |
| 97 | * the same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this |
| 98 | * code needs update as well. |
| 99 | */ |
| 100 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 101 | # if BTRFS_MAX_LEVEL != 8 |
| 102 | # error |
| 103 | # endif |
| 104 | static struct lock_class_key btrfs_eb_class[BTRFS_MAX_LEVEL + 1]; |
| 105 | static const char *btrfs_eb_name[BTRFS_MAX_LEVEL + 1] = { |
| 106 | /* leaf */ |
| 107 | "btrfs-extent-00", |
| 108 | "btrfs-extent-01", |
| 109 | "btrfs-extent-02", |
| 110 | "btrfs-extent-03", |
| 111 | "btrfs-extent-04", |
| 112 | "btrfs-extent-05", |
| 113 | "btrfs-extent-06", |
| 114 | "btrfs-extent-07", |
| 115 | /* highest possible level */ |
| 116 | "btrfs-extent-08", |
| 117 | }; |
| 118 | #endif |
| 119 | |
| 120 | /* |
| 121 | * extents on the btree inode are pretty simple, there's one extent |
| 122 | * that covers the entire device |
| 123 | */ |
| 124 | static struct extent_map *btree_get_extent(struct inode *inode, |
| 125 | struct page *page, size_t page_offset, u64 start, u64 len, |
| 126 | int create) |
| 127 | { |
| 128 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 129 | struct extent_map *em; |
| 130 | int ret; |
| 131 | |
| 132 | read_lock(&em_tree->lock); |
| 133 | em = lookup_extent_mapping(em_tree, start, len); |
| 134 | if (em) { |
| 135 | em->bdev = |
| 136 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
| 137 | read_unlock(&em_tree->lock); |
| 138 | goto out; |
| 139 | } |
| 140 | read_unlock(&em_tree->lock); |
| 141 | |
| 142 | em = alloc_extent_map(GFP_NOFS); |
| 143 | if (!em) { |
| 144 | em = ERR_PTR(-ENOMEM); |
| 145 | goto out; |
| 146 | } |
| 147 | em->start = 0; |
| 148 | em->len = (u64)-1; |
| 149 | em->block_len = (u64)-1; |
| 150 | em->block_start = 0; |
| 151 | em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
| 152 | |
| 153 | write_lock(&em_tree->lock); |
| 154 | ret = add_extent_mapping(em_tree, em); |
| 155 | if (ret == -EEXIST) { |
| 156 | u64 failed_start = em->start; |
| 157 | u64 failed_len = em->len; |
| 158 | |
| 159 | free_extent_map(em); |
| 160 | em = lookup_extent_mapping(em_tree, start, len); |
| 161 | if (em) { |
| 162 | ret = 0; |
| 163 | } else { |
| 164 | em = lookup_extent_mapping(em_tree, failed_start, |
| 165 | failed_len); |
| 166 | ret = -EIO; |
| 167 | } |
| 168 | } else if (ret) { |
| 169 | free_extent_map(em); |
| 170 | em = NULL; |
| 171 | } |
| 172 | write_unlock(&em_tree->lock); |
| 173 | |
| 174 | if (ret) |
| 175 | em = ERR_PTR(ret); |
| 176 | out: |
| 177 | return em; |
| 178 | } |
| 179 | |
| 180 | u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) |
| 181 | { |
| 182 | return crc32c(seed, data, len); |
| 183 | } |
| 184 | |
| 185 | void btrfs_csum_final(u32 crc, char *result) |
| 186 | { |
| 187 | *(__le32 *)result = ~cpu_to_le32(crc); |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * compute the csum for a btree block, and either verify it or write it |
| 192 | * into the csum field of the block. |
| 193 | */ |
| 194 | static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, |
| 195 | int verify) |
| 196 | { |
| 197 | u16 csum_size = |
| 198 | btrfs_super_csum_size(&root->fs_info->super_copy); |
| 199 | char *result = NULL; |
| 200 | unsigned long len; |
| 201 | unsigned long cur_len; |
| 202 | unsigned long offset = BTRFS_CSUM_SIZE; |
| 203 | char *map_token = NULL; |
| 204 | char *kaddr; |
| 205 | unsigned long map_start; |
| 206 | unsigned long map_len; |
| 207 | int err; |
| 208 | u32 crc = ~(u32)0; |
| 209 | unsigned long inline_result; |
| 210 | |
| 211 | len = buf->len - offset; |
| 212 | while (len > 0) { |
| 213 | err = map_private_extent_buffer(buf, offset, 32, |
| 214 | &map_token, &kaddr, |
| 215 | &map_start, &map_len, KM_USER0); |
| 216 | if (err) |
| 217 | return 1; |
| 218 | cur_len = min(len, map_len - (offset - map_start)); |
| 219 | crc = btrfs_csum_data(root, kaddr + offset - map_start, |
| 220 | crc, cur_len); |
| 221 | len -= cur_len; |
| 222 | offset += cur_len; |
| 223 | unmap_extent_buffer(buf, map_token, KM_USER0); |
| 224 | } |
| 225 | if (csum_size > sizeof(inline_result)) { |
| 226 | result = kzalloc(csum_size * sizeof(char), GFP_NOFS); |
| 227 | if (!result) |
| 228 | return 1; |
| 229 | } else { |
| 230 | result = (char *)&inline_result; |
| 231 | } |
| 232 | |
| 233 | btrfs_csum_final(crc, result); |
| 234 | |
| 235 | if (verify) { |
| 236 | if (memcmp_extent_buffer(buf, result, 0, csum_size)) { |
| 237 | u32 val; |
| 238 | u32 found = 0; |
| 239 | memcpy(&found, result, csum_size); |
| 240 | |
| 241 | read_extent_buffer(buf, &val, 0, csum_size); |
| 242 | if (printk_ratelimit()) { |
| 243 | printk(KERN_INFO "btrfs: %s checksum verify " |
| 244 | "failed on %llu wanted %X found %X " |
| 245 | "level %d\n", |
| 246 | root->fs_info->sb->s_id, |
| 247 | (unsigned long long)buf->start, val, found, |
| 248 | btrfs_header_level(buf)); |
| 249 | } |
| 250 | if (result != (char *)&inline_result) |
| 251 | kfree(result); |
| 252 | return 1; |
| 253 | } |
| 254 | } else { |
| 255 | write_extent_buffer(buf, result, 0, csum_size); |
| 256 | } |
| 257 | if (result != (char *)&inline_result) |
| 258 | kfree(result); |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | /* |
| 263 | * we can't consider a given block up to date unless the transid of the |
| 264 | * block matches the transid in the parent node's pointer. This is how we |
| 265 | * detect blocks that either didn't get written at all or got written |
| 266 | * in the wrong place. |
| 267 | */ |
| 268 | static int verify_parent_transid(struct extent_io_tree *io_tree, |
| 269 | struct extent_buffer *eb, u64 parent_transid) |
| 270 | { |
| 271 | struct extent_state *cached_state = NULL; |
| 272 | int ret; |
| 273 | |
| 274 | if (!parent_transid || btrfs_header_generation(eb) == parent_transid) |
| 275 | return 0; |
| 276 | |
| 277 | lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1, |
| 278 | 0, &cached_state, GFP_NOFS); |
| 279 | if (extent_buffer_uptodate(io_tree, eb, cached_state) && |
| 280 | btrfs_header_generation(eb) == parent_transid) { |
| 281 | ret = 0; |
| 282 | goto out; |
| 283 | } |
| 284 | if (printk_ratelimit()) { |
| 285 | printk("parent transid verify failed on %llu wanted %llu " |
| 286 | "found %llu\n", |
| 287 | (unsigned long long)eb->start, |
| 288 | (unsigned long long)parent_transid, |
| 289 | (unsigned long long)btrfs_header_generation(eb)); |
| 290 | } |
| 291 | ret = 1; |
| 292 | clear_extent_buffer_uptodate(io_tree, eb, &cached_state); |
| 293 | out: |
| 294 | unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1, |
| 295 | &cached_state, GFP_NOFS); |
| 296 | return ret; |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * helper to read a given tree block, doing retries as required when |
| 301 | * the checksums don't match and we have alternate mirrors to try. |
| 302 | */ |
| 303 | static int btree_read_extent_buffer_pages(struct btrfs_root *root, |
| 304 | struct extent_buffer *eb, |
| 305 | u64 start, u64 parent_transid) |
| 306 | { |
| 307 | struct extent_io_tree *io_tree; |
| 308 | int ret; |
| 309 | int num_copies = 0; |
| 310 | int mirror_num = 0; |
| 311 | |
| 312 | io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; |
| 313 | while (1) { |
| 314 | ret = read_extent_buffer_pages(io_tree, eb, start, 1, |
| 315 | btree_get_extent, mirror_num); |
| 316 | if (!ret && |
| 317 | !verify_parent_transid(io_tree, eb, parent_transid)) |
| 318 | return ret; |
| 319 | |
| 320 | num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, |
| 321 | eb->start, eb->len); |
| 322 | if (num_copies == 1) |
| 323 | return ret; |
| 324 | |
| 325 | mirror_num++; |
| 326 | if (mirror_num > num_copies) |
| 327 | return ret; |
| 328 | } |
| 329 | return -EIO; |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * checksum a dirty tree block before IO. This has extra checks to make sure |
| 334 | * we only fill in the checksum field in the first page of a multi-page block |
| 335 | */ |
| 336 | |
| 337 | static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) |
| 338 | { |
| 339 | struct extent_io_tree *tree; |
| 340 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
| 341 | u64 found_start; |
| 342 | unsigned long len; |
| 343 | struct extent_buffer *eb; |
| 344 | int ret; |
| 345 | |
| 346 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
| 347 | |
| 348 | if (page->private == EXTENT_PAGE_PRIVATE) |
| 349 | goto out; |
| 350 | if (!page->private) |
| 351 | goto out; |
| 352 | len = page->private >> 2; |
| 353 | WARN_ON(len == 0); |
| 354 | |
| 355 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); |
| 356 | ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, |
| 357 | btrfs_header_generation(eb)); |
| 358 | BUG_ON(ret); |
| 359 | WARN_ON(!btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN)); |
| 360 | |
| 361 | found_start = btrfs_header_bytenr(eb); |
| 362 | if (found_start != start) { |
| 363 | WARN_ON(1); |
| 364 | goto err; |
| 365 | } |
| 366 | if (eb->first_page != page) { |
| 367 | WARN_ON(1); |
| 368 | goto err; |
| 369 | } |
| 370 | if (!PageUptodate(page)) { |
| 371 | WARN_ON(1); |
| 372 | goto err; |
| 373 | } |
| 374 | csum_tree_block(root, eb, 0); |
| 375 | err: |
| 376 | free_extent_buffer(eb); |
| 377 | out: |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | static int check_tree_block_fsid(struct btrfs_root *root, |
| 382 | struct extent_buffer *eb) |
| 383 | { |
| 384 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
| 385 | u8 fsid[BTRFS_UUID_SIZE]; |
| 386 | int ret = 1; |
| 387 | |
| 388 | read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb), |
| 389 | BTRFS_FSID_SIZE); |
| 390 | while (fs_devices) { |
| 391 | if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { |
| 392 | ret = 0; |
| 393 | break; |
| 394 | } |
| 395 | fs_devices = fs_devices->seed; |
| 396 | } |
| 397 | return ret; |
| 398 | } |
| 399 | |
| 400 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 401 | void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level) |
| 402 | { |
| 403 | lockdep_set_class_and_name(&eb->lock, |
| 404 | &btrfs_eb_class[level], |
| 405 | btrfs_eb_name[level]); |
| 406 | } |
| 407 | #endif |
| 408 | |
| 409 | static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
| 410 | struct extent_state *state) |
| 411 | { |
| 412 | struct extent_io_tree *tree; |
| 413 | u64 found_start; |
| 414 | int found_level; |
| 415 | unsigned long len; |
| 416 | struct extent_buffer *eb; |
| 417 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
| 418 | int ret = 0; |
| 419 | |
| 420 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
| 421 | if (page->private == EXTENT_PAGE_PRIVATE) |
| 422 | goto out; |
| 423 | if (!page->private) |
| 424 | goto out; |
| 425 | |
| 426 | len = page->private >> 2; |
| 427 | WARN_ON(len == 0); |
| 428 | |
| 429 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); |
| 430 | |
| 431 | found_start = btrfs_header_bytenr(eb); |
| 432 | if (found_start != start) { |
| 433 | if (printk_ratelimit()) { |
| 434 | printk(KERN_INFO "btrfs bad tree block start " |
| 435 | "%llu %llu\n", |
| 436 | (unsigned long long)found_start, |
| 437 | (unsigned long long)eb->start); |
| 438 | } |
| 439 | ret = -EIO; |
| 440 | goto err; |
| 441 | } |
| 442 | if (eb->first_page != page) { |
| 443 | printk(KERN_INFO "btrfs bad first page %lu %lu\n", |
| 444 | eb->first_page->index, page->index); |
| 445 | WARN_ON(1); |
| 446 | ret = -EIO; |
| 447 | goto err; |
| 448 | } |
| 449 | if (check_tree_block_fsid(root, eb)) { |
| 450 | if (printk_ratelimit()) { |
| 451 | printk(KERN_INFO "btrfs bad fsid on block %llu\n", |
| 452 | (unsigned long long)eb->start); |
| 453 | } |
| 454 | ret = -EIO; |
| 455 | goto err; |
| 456 | } |
| 457 | found_level = btrfs_header_level(eb); |
| 458 | |
| 459 | btrfs_set_buffer_lockdep_class(eb, found_level); |
| 460 | |
| 461 | ret = csum_tree_block(root, eb, 1); |
| 462 | if (ret) |
| 463 | ret = -EIO; |
| 464 | |
| 465 | end = min_t(u64, eb->len, PAGE_CACHE_SIZE); |
| 466 | end = eb->start + end - 1; |
| 467 | err: |
| 468 | free_extent_buffer(eb); |
| 469 | out: |
| 470 | return ret; |
| 471 | } |
| 472 | |
| 473 | static void end_workqueue_bio(struct bio *bio, int err) |
| 474 | { |
| 475 | struct end_io_wq *end_io_wq = bio->bi_private; |
| 476 | struct btrfs_fs_info *fs_info; |
| 477 | |
| 478 | fs_info = end_io_wq->info; |
| 479 | end_io_wq->error = err; |
| 480 | end_io_wq->work.func = end_workqueue_fn; |
| 481 | end_io_wq->work.flags = 0; |
| 482 | |
| 483 | if (bio->bi_rw & REQ_WRITE) { |
| 484 | if (end_io_wq->metadata == 1) |
| 485 | btrfs_queue_worker(&fs_info->endio_meta_write_workers, |
| 486 | &end_io_wq->work); |
| 487 | else if (end_io_wq->metadata == 2) |
| 488 | btrfs_queue_worker(&fs_info->endio_freespace_worker, |
| 489 | &end_io_wq->work); |
| 490 | else |
| 491 | btrfs_queue_worker(&fs_info->endio_write_workers, |
| 492 | &end_io_wq->work); |
| 493 | } else { |
| 494 | if (end_io_wq->metadata) |
| 495 | btrfs_queue_worker(&fs_info->endio_meta_workers, |
| 496 | &end_io_wq->work); |
| 497 | else |
| 498 | btrfs_queue_worker(&fs_info->endio_workers, |
| 499 | &end_io_wq->work); |
| 500 | } |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * For the metadata arg you want |
| 505 | * |
| 506 | * 0 - if data |
| 507 | * 1 - if normal metadta |
| 508 | * 2 - if writing to the free space cache area |
| 509 | */ |
| 510 | int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, |
| 511 | int metadata) |
| 512 | { |
| 513 | struct end_io_wq *end_io_wq; |
| 514 | end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); |
| 515 | if (!end_io_wq) |
| 516 | return -ENOMEM; |
| 517 | |
| 518 | end_io_wq->private = bio->bi_private; |
| 519 | end_io_wq->end_io = bio->bi_end_io; |
| 520 | end_io_wq->info = info; |
| 521 | end_io_wq->error = 0; |
| 522 | end_io_wq->bio = bio; |
| 523 | end_io_wq->metadata = metadata; |
| 524 | |
| 525 | bio->bi_private = end_io_wq; |
| 526 | bio->bi_end_io = end_workqueue_bio; |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) |
| 531 | { |
| 532 | unsigned long limit = min_t(unsigned long, |
| 533 | info->workers.max_workers, |
| 534 | info->fs_devices->open_devices); |
| 535 | return 256 * limit; |
| 536 | } |
| 537 | |
| 538 | int btrfs_congested_async(struct btrfs_fs_info *info, int iodone) |
| 539 | { |
| 540 | return atomic_read(&info->nr_async_bios) > |
| 541 | btrfs_async_submit_limit(info); |
| 542 | } |
| 543 | |
| 544 | static void run_one_async_start(struct btrfs_work *work) |
| 545 | { |
| 546 | struct async_submit_bio *async; |
| 547 | |
| 548 | async = container_of(work, struct async_submit_bio, work); |
| 549 | async->submit_bio_start(async->inode, async->rw, async->bio, |
| 550 | async->mirror_num, async->bio_flags, |
| 551 | async->bio_offset); |
| 552 | } |
| 553 | |
| 554 | static void run_one_async_done(struct btrfs_work *work) |
| 555 | { |
| 556 | struct btrfs_fs_info *fs_info; |
| 557 | struct async_submit_bio *async; |
| 558 | int limit; |
| 559 | |
| 560 | async = container_of(work, struct async_submit_bio, work); |
| 561 | fs_info = BTRFS_I(async->inode)->root->fs_info; |
| 562 | |
| 563 | limit = btrfs_async_submit_limit(fs_info); |
| 564 | limit = limit * 2 / 3; |
| 565 | |
| 566 | atomic_dec(&fs_info->nr_async_submits); |
| 567 | |
| 568 | if (atomic_read(&fs_info->nr_async_submits) < limit && |
| 569 | waitqueue_active(&fs_info->async_submit_wait)) |
| 570 | wake_up(&fs_info->async_submit_wait); |
| 571 | |
| 572 | async->submit_bio_done(async->inode, async->rw, async->bio, |
| 573 | async->mirror_num, async->bio_flags, |
| 574 | async->bio_offset); |
| 575 | } |
| 576 | |
| 577 | static void run_one_async_free(struct btrfs_work *work) |
| 578 | { |
| 579 | struct async_submit_bio *async; |
| 580 | |
| 581 | async = container_of(work, struct async_submit_bio, work); |
| 582 | kfree(async); |
| 583 | } |
| 584 | |
| 585 | int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, |
| 586 | int rw, struct bio *bio, int mirror_num, |
| 587 | unsigned long bio_flags, |
| 588 | u64 bio_offset, |
| 589 | extent_submit_bio_hook_t *submit_bio_start, |
| 590 | extent_submit_bio_hook_t *submit_bio_done) |
| 591 | { |
| 592 | struct async_submit_bio *async; |
| 593 | |
| 594 | async = kmalloc(sizeof(*async), GFP_NOFS); |
| 595 | if (!async) |
| 596 | return -ENOMEM; |
| 597 | |
| 598 | async->inode = inode; |
| 599 | async->rw = rw; |
| 600 | async->bio = bio; |
| 601 | async->mirror_num = mirror_num; |
| 602 | async->submit_bio_start = submit_bio_start; |
| 603 | async->submit_bio_done = submit_bio_done; |
| 604 | |
| 605 | async->work.func = run_one_async_start; |
| 606 | async->work.ordered_func = run_one_async_done; |
| 607 | async->work.ordered_free = run_one_async_free; |
| 608 | |
| 609 | async->work.flags = 0; |
| 610 | async->bio_flags = bio_flags; |
| 611 | async->bio_offset = bio_offset; |
| 612 | |
| 613 | atomic_inc(&fs_info->nr_async_submits); |
| 614 | |
| 615 | if (rw & REQ_SYNC) |
| 616 | btrfs_set_work_high_prio(&async->work); |
| 617 | |
| 618 | btrfs_queue_worker(&fs_info->workers, &async->work); |
| 619 | |
| 620 | while (atomic_read(&fs_info->async_submit_draining) && |
| 621 | atomic_read(&fs_info->nr_async_submits)) { |
| 622 | wait_event(fs_info->async_submit_wait, |
| 623 | (atomic_read(&fs_info->nr_async_submits) == 0)); |
| 624 | } |
| 625 | |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | static int btree_csum_one_bio(struct bio *bio) |
| 630 | { |
| 631 | struct bio_vec *bvec = bio->bi_io_vec; |
| 632 | int bio_index = 0; |
| 633 | struct btrfs_root *root; |
| 634 | |
| 635 | WARN_ON(bio->bi_vcnt <= 0); |
| 636 | while (bio_index < bio->bi_vcnt) { |
| 637 | root = BTRFS_I(bvec->bv_page->mapping->host)->root; |
| 638 | csum_dirty_buffer(root, bvec->bv_page); |
| 639 | bio_index++; |
| 640 | bvec++; |
| 641 | } |
| 642 | return 0; |
| 643 | } |
| 644 | |
| 645 | static int __btree_submit_bio_start(struct inode *inode, int rw, |
| 646 | struct bio *bio, int mirror_num, |
| 647 | unsigned long bio_flags, |
| 648 | u64 bio_offset) |
| 649 | { |
| 650 | /* |
| 651 | * when we're called for a write, we're already in the async |
| 652 | * submission context. Just jump into btrfs_map_bio |
| 653 | */ |
| 654 | btree_csum_one_bio(bio); |
| 655 | return 0; |
| 656 | } |
| 657 | |
| 658 | static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
| 659 | int mirror_num, unsigned long bio_flags, |
| 660 | u64 bio_offset) |
| 661 | { |
| 662 | /* |
| 663 | * when we're called for a write, we're already in the async |
| 664 | * submission context. Just jump into btrfs_map_bio |
| 665 | */ |
| 666 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); |
| 667 | } |
| 668 | |
| 669 | static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
| 670 | int mirror_num, unsigned long bio_flags, |
| 671 | u64 bio_offset) |
| 672 | { |
| 673 | int ret; |
| 674 | |
| 675 | ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, |
| 676 | bio, 1); |
| 677 | BUG_ON(ret); |
| 678 | |
| 679 | if (!(rw & REQ_WRITE)) { |
| 680 | /* |
| 681 | * called for a read, do the setup so that checksum validation |
| 682 | * can happen in the async kernel threads |
| 683 | */ |
| 684 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, |
| 685 | mirror_num, 0); |
| 686 | } |
| 687 | |
| 688 | /* |
| 689 | * kthread helpers are used to submit writes so that checksumming |
| 690 | * can happen in parallel across all CPUs |
| 691 | */ |
| 692 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
| 693 | inode, rw, bio, mirror_num, 0, |
| 694 | bio_offset, |
| 695 | __btree_submit_bio_start, |
| 696 | __btree_submit_bio_done); |
| 697 | } |
| 698 | |
| 699 | static int btree_migratepage(struct address_space *mapping, |
| 700 | struct page *newpage, struct page *page) |
| 701 | { |
| 702 | /* |
| 703 | * we can't safely write a btree page from here, |
| 704 | * we haven't done the locking hook |
| 705 | */ |
| 706 | if (PageDirty(page)) |
| 707 | return -EAGAIN; |
| 708 | /* |
| 709 | * Buffers may be managed in a filesystem specific way. |
| 710 | * We must have no buffers or drop them. |
| 711 | */ |
| 712 | if (page_has_private(page) && |
| 713 | !try_to_release_page(page, GFP_KERNEL)) |
| 714 | return -EAGAIN; |
| 715 | #ifdef CONFIG_MIGRATION |
| 716 | return migrate_page(mapping, newpage, page); |
| 717 | #else |
| 718 | return -ENOSYS; |
| 719 | #endif |
| 720 | } |
| 721 | |
| 722 | static int btree_writepage(struct page *page, struct writeback_control *wbc) |
| 723 | { |
| 724 | struct extent_io_tree *tree; |
| 725 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
| 726 | struct extent_buffer *eb; |
| 727 | int was_dirty; |
| 728 | |
| 729 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
| 730 | if (!(current->flags & PF_MEMALLOC)) { |
| 731 | return extent_write_full_page(tree, page, |
| 732 | btree_get_extent, wbc); |
| 733 | } |
| 734 | |
| 735 | redirty_page_for_writepage(wbc, page); |
| 736 | eb = btrfs_find_tree_block(root, page_offset(page), PAGE_CACHE_SIZE); |
| 737 | WARN_ON(!eb); |
| 738 | |
| 739 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
| 740 | if (!was_dirty) { |
| 741 | spin_lock(&root->fs_info->delalloc_lock); |
| 742 | root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE; |
| 743 | spin_unlock(&root->fs_info->delalloc_lock); |
| 744 | } |
| 745 | free_extent_buffer(eb); |
| 746 | |
| 747 | unlock_page(page); |
| 748 | return 0; |
| 749 | } |
| 750 | |
| 751 | static int btree_writepages(struct address_space *mapping, |
| 752 | struct writeback_control *wbc) |
| 753 | { |
| 754 | struct extent_io_tree *tree; |
| 755 | tree = &BTRFS_I(mapping->host)->io_tree; |
| 756 | if (wbc->sync_mode == WB_SYNC_NONE) { |
| 757 | struct btrfs_root *root = BTRFS_I(mapping->host)->root; |
| 758 | u64 num_dirty; |
| 759 | unsigned long thresh = 32 * 1024 * 1024; |
| 760 | |
| 761 | if (wbc->for_kupdate) |
| 762 | return 0; |
| 763 | |
| 764 | /* this is a bit racy, but that's ok */ |
| 765 | num_dirty = root->fs_info->dirty_metadata_bytes; |
| 766 | if (num_dirty < thresh) |
| 767 | return 0; |
| 768 | } |
| 769 | return extent_writepages(tree, mapping, btree_get_extent, wbc); |
| 770 | } |
| 771 | |
| 772 | static int btree_readpage(struct file *file, struct page *page) |
| 773 | { |
| 774 | struct extent_io_tree *tree; |
| 775 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
| 776 | return extent_read_full_page(tree, page, btree_get_extent); |
| 777 | } |
| 778 | |
| 779 | static int btree_releasepage(struct page *page, gfp_t gfp_flags) |
| 780 | { |
| 781 | struct extent_io_tree *tree; |
| 782 | struct extent_map_tree *map; |
| 783 | int ret; |
| 784 | |
| 785 | if (PageWriteback(page) || PageDirty(page)) |
| 786 | return 0; |
| 787 | |
| 788 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
| 789 | map = &BTRFS_I(page->mapping->host)->extent_tree; |
| 790 | |
| 791 | ret = try_release_extent_state(map, tree, page, gfp_flags); |
| 792 | if (!ret) |
| 793 | return 0; |
| 794 | |
| 795 | ret = try_release_extent_buffer(tree, page); |
| 796 | if (ret == 1) { |
| 797 | ClearPagePrivate(page); |
| 798 | set_page_private(page, 0); |
| 799 | page_cache_release(page); |
| 800 | } |
| 801 | |
| 802 | return ret; |
| 803 | } |
| 804 | |
| 805 | static void btree_invalidatepage(struct page *page, unsigned long offset) |
| 806 | { |
| 807 | struct extent_io_tree *tree; |
| 808 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
| 809 | extent_invalidatepage(tree, page, offset); |
| 810 | btree_releasepage(page, GFP_NOFS); |
| 811 | if (PagePrivate(page)) { |
| 812 | printk(KERN_WARNING "btrfs warning page private not zero " |
| 813 | "on page %llu\n", (unsigned long long)page_offset(page)); |
| 814 | ClearPagePrivate(page); |
| 815 | set_page_private(page, 0); |
| 816 | page_cache_release(page); |
| 817 | } |
| 818 | } |
| 819 | |
| 820 | static const struct address_space_operations btree_aops = { |
| 821 | .readpage = btree_readpage, |
| 822 | .writepage = btree_writepage, |
| 823 | .writepages = btree_writepages, |
| 824 | .releasepage = btree_releasepage, |
| 825 | .invalidatepage = btree_invalidatepage, |
| 826 | .sync_page = block_sync_page, |
| 827 | #ifdef CONFIG_MIGRATION |
| 828 | .migratepage = btree_migratepage, |
| 829 | #endif |
| 830 | }; |
| 831 | |
| 832 | int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, |
| 833 | u64 parent_transid) |
| 834 | { |
| 835 | struct extent_buffer *buf = NULL; |
| 836 | struct inode *btree_inode = root->fs_info->btree_inode; |
| 837 | int ret = 0; |
| 838 | |
| 839 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
| 840 | if (!buf) |
| 841 | return 0; |
| 842 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, |
| 843 | buf, 0, 0, btree_get_extent, 0); |
| 844 | free_extent_buffer(buf); |
| 845 | return ret; |
| 846 | } |
| 847 | |
| 848 | struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, |
| 849 | u64 bytenr, u32 blocksize) |
| 850 | { |
| 851 | struct inode *btree_inode = root->fs_info->btree_inode; |
| 852 | struct extent_buffer *eb; |
| 853 | eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, |
| 854 | bytenr, blocksize, GFP_NOFS); |
| 855 | return eb; |
| 856 | } |
| 857 | |
| 858 | struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, |
| 859 | u64 bytenr, u32 blocksize) |
| 860 | { |
| 861 | struct inode *btree_inode = root->fs_info->btree_inode; |
| 862 | struct extent_buffer *eb; |
| 863 | |
| 864 | eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, |
| 865 | bytenr, blocksize, NULL, GFP_NOFS); |
| 866 | return eb; |
| 867 | } |
| 868 | |
| 869 | |
| 870 | int btrfs_write_tree_block(struct extent_buffer *buf) |
| 871 | { |
| 872 | return filemap_fdatawrite_range(buf->first_page->mapping, buf->start, |
| 873 | buf->start + buf->len - 1); |
| 874 | } |
| 875 | |
| 876 | int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) |
| 877 | { |
| 878 | return filemap_fdatawait_range(buf->first_page->mapping, |
| 879 | buf->start, buf->start + buf->len - 1); |
| 880 | } |
| 881 | |
| 882 | struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, |
| 883 | u32 blocksize, u64 parent_transid) |
| 884 | { |
| 885 | struct extent_buffer *buf = NULL; |
| 886 | int ret; |
| 887 | |
| 888 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
| 889 | if (!buf) |
| 890 | return NULL; |
| 891 | |
| 892 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
| 893 | |
| 894 | if (ret == 0) |
| 895 | set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); |
| 896 | return buf; |
| 897 | |
| 898 | } |
| 899 | |
| 900 | int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 901 | struct extent_buffer *buf) |
| 902 | { |
| 903 | struct inode *btree_inode = root->fs_info->btree_inode; |
| 904 | if (btrfs_header_generation(buf) == |
| 905 | root->fs_info->running_transaction->transid) { |
| 906 | btrfs_assert_tree_locked(buf); |
| 907 | |
| 908 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { |
| 909 | spin_lock(&root->fs_info->delalloc_lock); |
| 910 | if (root->fs_info->dirty_metadata_bytes >= buf->len) |
| 911 | root->fs_info->dirty_metadata_bytes -= buf->len; |
| 912 | else |
| 913 | WARN_ON(1); |
| 914 | spin_unlock(&root->fs_info->delalloc_lock); |
| 915 | } |
| 916 | |
| 917 | /* ugh, clear_extent_buffer_dirty needs to lock the page */ |
| 918 | btrfs_set_lock_blocking(buf); |
| 919 | clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, |
| 920 | buf); |
| 921 | } |
| 922 | return 0; |
| 923 | } |
| 924 | |
| 925 | static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, |
| 926 | u32 stripesize, struct btrfs_root *root, |
| 927 | struct btrfs_fs_info *fs_info, |
| 928 | u64 objectid) |
| 929 | { |
| 930 | root->node = NULL; |
| 931 | root->commit_root = NULL; |
| 932 | root->sectorsize = sectorsize; |
| 933 | root->nodesize = nodesize; |
| 934 | root->leafsize = leafsize; |
| 935 | root->stripesize = stripesize; |
| 936 | root->ref_cows = 0; |
| 937 | root->track_dirty = 0; |
| 938 | root->in_radix = 0; |
| 939 | root->orphan_item_inserted = 0; |
| 940 | root->orphan_cleanup_state = 0; |
| 941 | |
| 942 | root->fs_info = fs_info; |
| 943 | root->objectid = objectid; |
| 944 | root->last_trans = 0; |
| 945 | root->highest_objectid = 0; |
| 946 | root->name = NULL; |
| 947 | root->in_sysfs = 0; |
| 948 | root->inode_tree = RB_ROOT; |
| 949 | root->block_rsv = NULL; |
| 950 | root->orphan_block_rsv = NULL; |
| 951 | |
| 952 | INIT_LIST_HEAD(&root->dirty_list); |
| 953 | INIT_LIST_HEAD(&root->orphan_list); |
| 954 | INIT_LIST_HEAD(&root->root_list); |
| 955 | spin_lock_init(&root->node_lock); |
| 956 | spin_lock_init(&root->orphan_lock); |
| 957 | spin_lock_init(&root->inode_lock); |
| 958 | spin_lock_init(&root->accounting_lock); |
| 959 | mutex_init(&root->objectid_mutex); |
| 960 | mutex_init(&root->log_mutex); |
| 961 | init_waitqueue_head(&root->log_writer_wait); |
| 962 | init_waitqueue_head(&root->log_commit_wait[0]); |
| 963 | init_waitqueue_head(&root->log_commit_wait[1]); |
| 964 | atomic_set(&root->log_commit[0], 0); |
| 965 | atomic_set(&root->log_commit[1], 0); |
| 966 | atomic_set(&root->log_writers, 0); |
| 967 | root->log_batch = 0; |
| 968 | root->log_transid = 0; |
| 969 | root->last_log_commit = 0; |
| 970 | extent_io_tree_init(&root->dirty_log_pages, |
| 971 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
| 972 | |
| 973 | memset(&root->root_key, 0, sizeof(root->root_key)); |
| 974 | memset(&root->root_item, 0, sizeof(root->root_item)); |
| 975 | memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); |
| 976 | memset(&root->root_kobj, 0, sizeof(root->root_kobj)); |
| 977 | root->defrag_trans_start = fs_info->generation; |
| 978 | init_completion(&root->kobj_unregister); |
| 979 | root->defrag_running = 0; |
| 980 | root->root_key.objectid = objectid; |
| 981 | root->anon_super.s_root = NULL; |
| 982 | root->anon_super.s_dev = 0; |
| 983 | INIT_LIST_HEAD(&root->anon_super.s_list); |
| 984 | INIT_LIST_HEAD(&root->anon_super.s_instances); |
| 985 | init_rwsem(&root->anon_super.s_umount); |
| 986 | |
| 987 | return 0; |
| 988 | } |
| 989 | |
| 990 | static int find_and_setup_root(struct btrfs_root *tree_root, |
| 991 | struct btrfs_fs_info *fs_info, |
| 992 | u64 objectid, |
| 993 | struct btrfs_root *root) |
| 994 | { |
| 995 | int ret; |
| 996 | u32 blocksize; |
| 997 | u64 generation; |
| 998 | |
| 999 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
| 1000 | tree_root->sectorsize, tree_root->stripesize, |
| 1001 | root, fs_info, objectid); |
| 1002 | ret = btrfs_find_last_root(tree_root, objectid, |
| 1003 | &root->root_item, &root->root_key); |
| 1004 | if (ret > 0) |
| 1005 | return -ENOENT; |
| 1006 | BUG_ON(ret); |
| 1007 | |
| 1008 | generation = btrfs_root_generation(&root->root_item); |
| 1009 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
| 1010 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), |
| 1011 | blocksize, generation); |
| 1012 | BUG_ON(!root->node); |
| 1013 | root->commit_root = btrfs_root_node(root); |
| 1014 | return 0; |
| 1015 | } |
| 1016 | |
| 1017 | static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, |
| 1018 | struct btrfs_fs_info *fs_info) |
| 1019 | { |
| 1020 | struct btrfs_root *root; |
| 1021 | struct btrfs_root *tree_root = fs_info->tree_root; |
| 1022 | struct extent_buffer *leaf; |
| 1023 | |
| 1024 | root = kzalloc(sizeof(*root), GFP_NOFS); |
| 1025 | if (!root) |
| 1026 | return ERR_PTR(-ENOMEM); |
| 1027 | |
| 1028 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
| 1029 | tree_root->sectorsize, tree_root->stripesize, |
| 1030 | root, fs_info, BTRFS_TREE_LOG_OBJECTID); |
| 1031 | |
| 1032 | root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; |
| 1033 | root->root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 1034 | root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; |
| 1035 | /* |
| 1036 | * log trees do not get reference counted because they go away |
| 1037 | * before a real commit is actually done. They do store pointers |
| 1038 | * to file data extents, and those reference counts still get |
| 1039 | * updated (along with back refs to the log tree). |
| 1040 | */ |
| 1041 | root->ref_cows = 0; |
| 1042 | |
| 1043 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, |
| 1044 | BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0); |
| 1045 | if (IS_ERR(leaf)) { |
| 1046 | kfree(root); |
| 1047 | return ERR_CAST(leaf); |
| 1048 | } |
| 1049 | |
| 1050 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
| 1051 | btrfs_set_header_bytenr(leaf, leaf->start); |
| 1052 | btrfs_set_header_generation(leaf, trans->transid); |
| 1053 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
| 1054 | btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); |
| 1055 | root->node = leaf; |
| 1056 | |
| 1057 | write_extent_buffer(root->node, root->fs_info->fsid, |
| 1058 | (unsigned long)btrfs_header_fsid(root->node), |
| 1059 | BTRFS_FSID_SIZE); |
| 1060 | btrfs_mark_buffer_dirty(root->node); |
| 1061 | btrfs_tree_unlock(root->node); |
| 1062 | return root; |
| 1063 | } |
| 1064 | |
| 1065 | int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, |
| 1066 | struct btrfs_fs_info *fs_info) |
| 1067 | { |
| 1068 | struct btrfs_root *log_root; |
| 1069 | |
| 1070 | log_root = alloc_log_tree(trans, fs_info); |
| 1071 | if (IS_ERR(log_root)) |
| 1072 | return PTR_ERR(log_root); |
| 1073 | WARN_ON(fs_info->log_root_tree); |
| 1074 | fs_info->log_root_tree = log_root; |
| 1075 | return 0; |
| 1076 | } |
| 1077 | |
| 1078 | int btrfs_add_log_tree(struct btrfs_trans_handle *trans, |
| 1079 | struct btrfs_root *root) |
| 1080 | { |
| 1081 | struct btrfs_root *log_root; |
| 1082 | struct btrfs_inode_item *inode_item; |
| 1083 | |
| 1084 | log_root = alloc_log_tree(trans, root->fs_info); |
| 1085 | if (IS_ERR(log_root)) |
| 1086 | return PTR_ERR(log_root); |
| 1087 | |
| 1088 | log_root->last_trans = trans->transid; |
| 1089 | log_root->root_key.offset = root->root_key.objectid; |
| 1090 | |
| 1091 | inode_item = &log_root->root_item.inode; |
| 1092 | inode_item->generation = cpu_to_le64(1); |
| 1093 | inode_item->size = cpu_to_le64(3); |
| 1094 | inode_item->nlink = cpu_to_le32(1); |
| 1095 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
| 1096 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
| 1097 | |
| 1098 | btrfs_set_root_node(&log_root->root_item, log_root->node); |
| 1099 | |
| 1100 | WARN_ON(root->log_root); |
| 1101 | root->log_root = log_root; |
| 1102 | root->log_transid = 0; |
| 1103 | root->last_log_commit = 0; |
| 1104 | return 0; |
| 1105 | } |
| 1106 | |
| 1107 | struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, |
| 1108 | struct btrfs_key *location) |
| 1109 | { |
| 1110 | struct btrfs_root *root; |
| 1111 | struct btrfs_fs_info *fs_info = tree_root->fs_info; |
| 1112 | struct btrfs_path *path; |
| 1113 | struct extent_buffer *l; |
| 1114 | u64 generation; |
| 1115 | u32 blocksize; |
| 1116 | int ret = 0; |
| 1117 | |
| 1118 | root = kzalloc(sizeof(*root), GFP_NOFS); |
| 1119 | if (!root) |
| 1120 | return ERR_PTR(-ENOMEM); |
| 1121 | if (location->offset == (u64)-1) { |
| 1122 | ret = find_and_setup_root(tree_root, fs_info, |
| 1123 | location->objectid, root); |
| 1124 | if (ret) { |
| 1125 | kfree(root); |
| 1126 | return ERR_PTR(ret); |
| 1127 | } |
| 1128 | goto out; |
| 1129 | } |
| 1130 | |
| 1131 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
| 1132 | tree_root->sectorsize, tree_root->stripesize, |
| 1133 | root, fs_info, location->objectid); |
| 1134 | |
| 1135 | path = btrfs_alloc_path(); |
| 1136 | BUG_ON(!path); |
| 1137 | ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); |
| 1138 | if (ret == 0) { |
| 1139 | l = path->nodes[0]; |
| 1140 | read_extent_buffer(l, &root->root_item, |
| 1141 | btrfs_item_ptr_offset(l, path->slots[0]), |
| 1142 | sizeof(root->root_item)); |
| 1143 | memcpy(&root->root_key, location, sizeof(*location)); |
| 1144 | } |
| 1145 | btrfs_free_path(path); |
| 1146 | if (ret) { |
| 1147 | if (ret > 0) |
| 1148 | ret = -ENOENT; |
| 1149 | return ERR_PTR(ret); |
| 1150 | } |
| 1151 | |
| 1152 | generation = btrfs_root_generation(&root->root_item); |
| 1153 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
| 1154 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), |
| 1155 | blocksize, generation); |
| 1156 | root->commit_root = btrfs_root_node(root); |
| 1157 | BUG_ON(!root->node); |
| 1158 | out: |
| 1159 | if (location->objectid != BTRFS_TREE_LOG_OBJECTID) |
| 1160 | root->ref_cows = 1; |
| 1161 | |
| 1162 | return root; |
| 1163 | } |
| 1164 | |
| 1165 | struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, |
| 1166 | u64 root_objectid) |
| 1167 | { |
| 1168 | struct btrfs_root *root; |
| 1169 | |
| 1170 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID) |
| 1171 | return fs_info->tree_root; |
| 1172 | if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID) |
| 1173 | return fs_info->extent_root; |
| 1174 | |
| 1175 | root = radix_tree_lookup(&fs_info->fs_roots_radix, |
| 1176 | (unsigned long)root_objectid); |
| 1177 | return root; |
| 1178 | } |
| 1179 | |
| 1180 | struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, |
| 1181 | struct btrfs_key *location) |
| 1182 | { |
| 1183 | struct btrfs_root *root; |
| 1184 | int ret; |
| 1185 | |
| 1186 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) |
| 1187 | return fs_info->tree_root; |
| 1188 | if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) |
| 1189 | return fs_info->extent_root; |
| 1190 | if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) |
| 1191 | return fs_info->chunk_root; |
| 1192 | if (location->objectid == BTRFS_DEV_TREE_OBJECTID) |
| 1193 | return fs_info->dev_root; |
| 1194 | if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) |
| 1195 | return fs_info->csum_root; |
| 1196 | again: |
| 1197 | spin_lock(&fs_info->fs_roots_radix_lock); |
| 1198 | root = radix_tree_lookup(&fs_info->fs_roots_radix, |
| 1199 | (unsigned long)location->objectid); |
| 1200 | spin_unlock(&fs_info->fs_roots_radix_lock); |
| 1201 | if (root) |
| 1202 | return root; |
| 1203 | |
| 1204 | root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); |
| 1205 | if (IS_ERR(root)) |
| 1206 | return root; |
| 1207 | |
| 1208 | set_anon_super(&root->anon_super, NULL); |
| 1209 | |
| 1210 | if (btrfs_root_refs(&root->root_item) == 0) { |
| 1211 | ret = -ENOENT; |
| 1212 | goto fail; |
| 1213 | } |
| 1214 | |
| 1215 | ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid); |
| 1216 | if (ret < 0) |
| 1217 | goto fail; |
| 1218 | if (ret == 0) |
| 1219 | root->orphan_item_inserted = 1; |
| 1220 | |
| 1221 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
| 1222 | if (ret) |
| 1223 | goto fail; |
| 1224 | |
| 1225 | spin_lock(&fs_info->fs_roots_radix_lock); |
| 1226 | ret = radix_tree_insert(&fs_info->fs_roots_radix, |
| 1227 | (unsigned long)root->root_key.objectid, |
| 1228 | root); |
| 1229 | if (ret == 0) |
| 1230 | root->in_radix = 1; |
| 1231 | |
| 1232 | spin_unlock(&fs_info->fs_roots_radix_lock); |
| 1233 | radix_tree_preload_end(); |
| 1234 | if (ret) { |
| 1235 | if (ret == -EEXIST) { |
| 1236 | free_fs_root(root); |
| 1237 | goto again; |
| 1238 | } |
| 1239 | goto fail; |
| 1240 | } |
| 1241 | |
| 1242 | ret = btrfs_find_dead_roots(fs_info->tree_root, |
| 1243 | root->root_key.objectid); |
| 1244 | WARN_ON(ret); |
| 1245 | return root; |
| 1246 | fail: |
| 1247 | free_fs_root(root); |
| 1248 | return ERR_PTR(ret); |
| 1249 | } |
| 1250 | |
| 1251 | struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, |
| 1252 | struct btrfs_key *location, |
| 1253 | const char *name, int namelen) |
| 1254 | { |
| 1255 | return btrfs_read_fs_root_no_name(fs_info, location); |
| 1256 | #if 0 |
| 1257 | struct btrfs_root *root; |
| 1258 | int ret; |
| 1259 | |
| 1260 | root = btrfs_read_fs_root_no_name(fs_info, location); |
| 1261 | if (!root) |
| 1262 | return NULL; |
| 1263 | |
| 1264 | if (root->in_sysfs) |
| 1265 | return root; |
| 1266 | |
| 1267 | ret = btrfs_set_root_name(root, name, namelen); |
| 1268 | if (ret) { |
| 1269 | free_extent_buffer(root->node); |
| 1270 | kfree(root); |
| 1271 | return ERR_PTR(ret); |
| 1272 | } |
| 1273 | |
| 1274 | ret = btrfs_sysfs_add_root(root); |
| 1275 | if (ret) { |
| 1276 | free_extent_buffer(root->node); |
| 1277 | kfree(root->name); |
| 1278 | kfree(root); |
| 1279 | return ERR_PTR(ret); |
| 1280 | } |
| 1281 | root->in_sysfs = 1; |
| 1282 | return root; |
| 1283 | #endif |
| 1284 | } |
| 1285 | |
| 1286 | static int btrfs_congested_fn(void *congested_data, int bdi_bits) |
| 1287 | { |
| 1288 | struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; |
| 1289 | int ret = 0; |
| 1290 | struct btrfs_device *device; |
| 1291 | struct backing_dev_info *bdi; |
| 1292 | |
| 1293 | list_for_each_entry(device, &info->fs_devices->devices, dev_list) { |
| 1294 | if (!device->bdev) |
| 1295 | continue; |
| 1296 | bdi = blk_get_backing_dev_info(device->bdev); |
| 1297 | if (bdi && bdi_congested(bdi, bdi_bits)) { |
| 1298 | ret = 1; |
| 1299 | break; |
| 1300 | } |
| 1301 | } |
| 1302 | return ret; |
| 1303 | } |
| 1304 | |
| 1305 | /* |
| 1306 | * this unplugs every device on the box, and it is only used when page |
| 1307 | * is null |
| 1308 | */ |
| 1309 | static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page) |
| 1310 | { |
| 1311 | struct btrfs_device *device; |
| 1312 | struct btrfs_fs_info *info; |
| 1313 | |
| 1314 | info = (struct btrfs_fs_info *)bdi->unplug_io_data; |
| 1315 | list_for_each_entry(device, &info->fs_devices->devices, dev_list) { |
| 1316 | if (!device->bdev) |
| 1317 | continue; |
| 1318 | |
| 1319 | bdi = blk_get_backing_dev_info(device->bdev); |
| 1320 | if (bdi->unplug_io_fn) |
| 1321 | bdi->unplug_io_fn(bdi, page); |
| 1322 | } |
| 1323 | } |
| 1324 | |
| 1325 | static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) |
| 1326 | { |
| 1327 | struct inode *inode; |
| 1328 | struct extent_map_tree *em_tree; |
| 1329 | struct extent_map *em; |
| 1330 | struct address_space *mapping; |
| 1331 | u64 offset; |
| 1332 | |
| 1333 | /* the generic O_DIRECT read code does this */ |
| 1334 | if (1 || !page) { |
| 1335 | __unplug_io_fn(bdi, page); |
| 1336 | return; |
| 1337 | } |
| 1338 | |
| 1339 | /* |
| 1340 | * page->mapping may change at any time. Get a consistent copy |
| 1341 | * and use that for everything below |
| 1342 | */ |
| 1343 | smp_mb(); |
| 1344 | mapping = page->mapping; |
| 1345 | if (!mapping) |
| 1346 | return; |
| 1347 | |
| 1348 | inode = mapping->host; |
| 1349 | |
| 1350 | /* |
| 1351 | * don't do the expensive searching for a small number of |
| 1352 | * devices |
| 1353 | */ |
| 1354 | if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) { |
| 1355 | __unplug_io_fn(bdi, page); |
| 1356 | return; |
| 1357 | } |
| 1358 | |
| 1359 | offset = page_offset(page); |
| 1360 | |
| 1361 | em_tree = &BTRFS_I(inode)->extent_tree; |
| 1362 | read_lock(&em_tree->lock); |
| 1363 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); |
| 1364 | read_unlock(&em_tree->lock); |
| 1365 | if (!em) { |
| 1366 | __unplug_io_fn(bdi, page); |
| 1367 | return; |
| 1368 | } |
| 1369 | |
| 1370 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
| 1371 | free_extent_map(em); |
| 1372 | __unplug_io_fn(bdi, page); |
| 1373 | return; |
| 1374 | } |
| 1375 | offset = offset - em->start; |
| 1376 | btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree, |
| 1377 | em->block_start + offset, page); |
| 1378 | free_extent_map(em); |
| 1379 | } |
| 1380 | |
| 1381 | /* |
| 1382 | * If this fails, caller must call bdi_destroy() to get rid of the |
| 1383 | * bdi again. |
| 1384 | */ |
| 1385 | static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) |
| 1386 | { |
| 1387 | int err; |
| 1388 | |
| 1389 | bdi->capabilities = BDI_CAP_MAP_COPY; |
| 1390 | err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY); |
| 1391 | if (err) |
| 1392 | return err; |
| 1393 | |
| 1394 | bdi->ra_pages = default_backing_dev_info.ra_pages; |
| 1395 | bdi->unplug_io_fn = btrfs_unplug_io_fn; |
| 1396 | bdi->unplug_io_data = info; |
| 1397 | bdi->congested_fn = btrfs_congested_fn; |
| 1398 | bdi->congested_data = info; |
| 1399 | return 0; |
| 1400 | } |
| 1401 | |
| 1402 | static int bio_ready_for_csum(struct bio *bio) |
| 1403 | { |
| 1404 | u64 length = 0; |
| 1405 | u64 buf_len = 0; |
| 1406 | u64 start = 0; |
| 1407 | struct page *page; |
| 1408 | struct extent_io_tree *io_tree = NULL; |
| 1409 | struct bio_vec *bvec; |
| 1410 | int i; |
| 1411 | int ret; |
| 1412 | |
| 1413 | bio_for_each_segment(bvec, bio, i) { |
| 1414 | page = bvec->bv_page; |
| 1415 | if (page->private == EXTENT_PAGE_PRIVATE) { |
| 1416 | length += bvec->bv_len; |
| 1417 | continue; |
| 1418 | } |
| 1419 | if (!page->private) { |
| 1420 | length += bvec->bv_len; |
| 1421 | continue; |
| 1422 | } |
| 1423 | length = bvec->bv_len; |
| 1424 | buf_len = page->private >> 2; |
| 1425 | start = page_offset(page) + bvec->bv_offset; |
| 1426 | io_tree = &BTRFS_I(page->mapping->host)->io_tree; |
| 1427 | } |
| 1428 | /* are we fully contained in this bio? */ |
| 1429 | if (buf_len <= length) |
| 1430 | return 1; |
| 1431 | |
| 1432 | ret = extent_range_uptodate(io_tree, start + length, |
| 1433 | start + buf_len - 1); |
| 1434 | return ret; |
| 1435 | } |
| 1436 | |
| 1437 | /* |
| 1438 | * called by the kthread helper functions to finally call the bio end_io |
| 1439 | * functions. This is where read checksum verification actually happens |
| 1440 | */ |
| 1441 | static void end_workqueue_fn(struct btrfs_work *work) |
| 1442 | { |
| 1443 | struct bio *bio; |
| 1444 | struct end_io_wq *end_io_wq; |
| 1445 | struct btrfs_fs_info *fs_info; |
| 1446 | int error; |
| 1447 | |
| 1448 | end_io_wq = container_of(work, struct end_io_wq, work); |
| 1449 | bio = end_io_wq->bio; |
| 1450 | fs_info = end_io_wq->info; |
| 1451 | |
| 1452 | /* metadata bio reads are special because the whole tree block must |
| 1453 | * be checksummed at once. This makes sure the entire block is in |
| 1454 | * ram and up to date before trying to verify things. For |
| 1455 | * blocksize <= pagesize, it is basically a noop |
| 1456 | */ |
| 1457 | if (!(bio->bi_rw & REQ_WRITE) && end_io_wq->metadata && |
| 1458 | !bio_ready_for_csum(bio)) { |
| 1459 | btrfs_queue_worker(&fs_info->endio_meta_workers, |
| 1460 | &end_io_wq->work); |
| 1461 | return; |
| 1462 | } |
| 1463 | error = end_io_wq->error; |
| 1464 | bio->bi_private = end_io_wq->private; |
| 1465 | bio->bi_end_io = end_io_wq->end_io; |
| 1466 | kfree(end_io_wq); |
| 1467 | bio_endio(bio, error); |
| 1468 | } |
| 1469 | |
| 1470 | static int cleaner_kthread(void *arg) |
| 1471 | { |
| 1472 | struct btrfs_root *root = arg; |
| 1473 | |
| 1474 | do { |
| 1475 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); |
| 1476 | |
| 1477 | if (!(root->fs_info->sb->s_flags & MS_RDONLY) && |
| 1478 | mutex_trylock(&root->fs_info->cleaner_mutex)) { |
| 1479 | btrfs_run_delayed_iputs(root); |
| 1480 | btrfs_clean_old_snapshots(root); |
| 1481 | mutex_unlock(&root->fs_info->cleaner_mutex); |
| 1482 | } |
| 1483 | |
| 1484 | if (freezing(current)) { |
| 1485 | refrigerator(); |
| 1486 | } else { |
| 1487 | set_current_state(TASK_INTERRUPTIBLE); |
| 1488 | if (!kthread_should_stop()) |
| 1489 | schedule(); |
| 1490 | __set_current_state(TASK_RUNNING); |
| 1491 | } |
| 1492 | } while (!kthread_should_stop()); |
| 1493 | return 0; |
| 1494 | } |
| 1495 | |
| 1496 | static int transaction_kthread(void *arg) |
| 1497 | { |
| 1498 | struct btrfs_root *root = arg; |
| 1499 | struct btrfs_trans_handle *trans; |
| 1500 | struct btrfs_transaction *cur; |
| 1501 | u64 transid; |
| 1502 | unsigned long now; |
| 1503 | unsigned long delay; |
| 1504 | int ret; |
| 1505 | |
| 1506 | do { |
| 1507 | delay = HZ * 30; |
| 1508 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); |
| 1509 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
| 1510 | |
| 1511 | spin_lock(&root->fs_info->new_trans_lock); |
| 1512 | cur = root->fs_info->running_transaction; |
| 1513 | if (!cur) { |
| 1514 | spin_unlock(&root->fs_info->new_trans_lock); |
| 1515 | goto sleep; |
| 1516 | } |
| 1517 | |
| 1518 | now = get_seconds(); |
| 1519 | if (!cur->blocked && |
| 1520 | (now < cur->start_time || now - cur->start_time < 30)) { |
| 1521 | spin_unlock(&root->fs_info->new_trans_lock); |
| 1522 | delay = HZ * 5; |
| 1523 | goto sleep; |
| 1524 | } |
| 1525 | transid = cur->transid; |
| 1526 | spin_unlock(&root->fs_info->new_trans_lock); |
| 1527 | |
| 1528 | trans = btrfs_join_transaction(root, 1); |
| 1529 | if (transid == trans->transid) { |
| 1530 | ret = btrfs_commit_transaction(trans, root); |
| 1531 | BUG_ON(ret); |
| 1532 | } else { |
| 1533 | btrfs_end_transaction(trans, root); |
| 1534 | } |
| 1535 | sleep: |
| 1536 | wake_up_process(root->fs_info->cleaner_kthread); |
| 1537 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); |
| 1538 | |
| 1539 | if (freezing(current)) { |
| 1540 | refrigerator(); |
| 1541 | } else { |
| 1542 | set_current_state(TASK_INTERRUPTIBLE); |
| 1543 | if (!kthread_should_stop() && |
| 1544 | !btrfs_transaction_blocked(root->fs_info)) |
| 1545 | schedule_timeout(delay); |
| 1546 | __set_current_state(TASK_RUNNING); |
| 1547 | } |
| 1548 | } while (!kthread_should_stop()); |
| 1549 | return 0; |
| 1550 | } |
| 1551 | |
| 1552 | struct btrfs_root *open_ctree(struct super_block *sb, |
| 1553 | struct btrfs_fs_devices *fs_devices, |
| 1554 | char *options) |
| 1555 | { |
| 1556 | u32 sectorsize; |
| 1557 | u32 nodesize; |
| 1558 | u32 leafsize; |
| 1559 | u32 blocksize; |
| 1560 | u32 stripesize; |
| 1561 | u64 generation; |
| 1562 | u64 features; |
| 1563 | struct btrfs_key location; |
| 1564 | struct buffer_head *bh; |
| 1565 | struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root), |
| 1566 | GFP_NOFS); |
| 1567 | struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root), |
| 1568 | GFP_NOFS); |
| 1569 | struct btrfs_root *tree_root = btrfs_sb(sb); |
| 1570 | struct btrfs_fs_info *fs_info = tree_root->fs_info; |
| 1571 | struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root), |
| 1572 | GFP_NOFS); |
| 1573 | struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root), |
| 1574 | GFP_NOFS); |
| 1575 | struct btrfs_root *log_tree_root; |
| 1576 | |
| 1577 | int ret; |
| 1578 | int err = -EINVAL; |
| 1579 | |
| 1580 | struct btrfs_super_block *disk_super; |
| 1581 | |
| 1582 | if (!extent_root || !tree_root || !fs_info || |
| 1583 | !chunk_root || !dev_root || !csum_root) { |
| 1584 | err = -ENOMEM; |
| 1585 | goto fail; |
| 1586 | } |
| 1587 | |
| 1588 | ret = init_srcu_struct(&fs_info->subvol_srcu); |
| 1589 | if (ret) { |
| 1590 | err = ret; |
| 1591 | goto fail; |
| 1592 | } |
| 1593 | |
| 1594 | ret = setup_bdi(fs_info, &fs_info->bdi); |
| 1595 | if (ret) { |
| 1596 | err = ret; |
| 1597 | goto fail_srcu; |
| 1598 | } |
| 1599 | |
| 1600 | fs_info->btree_inode = new_inode(sb); |
| 1601 | if (!fs_info->btree_inode) { |
| 1602 | err = -ENOMEM; |
| 1603 | goto fail_bdi; |
| 1604 | } |
| 1605 | |
| 1606 | INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); |
| 1607 | INIT_LIST_HEAD(&fs_info->trans_list); |
| 1608 | INIT_LIST_HEAD(&fs_info->dead_roots); |
| 1609 | INIT_LIST_HEAD(&fs_info->delayed_iputs); |
| 1610 | INIT_LIST_HEAD(&fs_info->hashers); |
| 1611 | INIT_LIST_HEAD(&fs_info->delalloc_inodes); |
| 1612 | INIT_LIST_HEAD(&fs_info->ordered_operations); |
| 1613 | INIT_LIST_HEAD(&fs_info->caching_block_groups); |
| 1614 | spin_lock_init(&fs_info->delalloc_lock); |
| 1615 | spin_lock_init(&fs_info->new_trans_lock); |
| 1616 | spin_lock_init(&fs_info->ref_cache_lock); |
| 1617 | spin_lock_init(&fs_info->fs_roots_radix_lock); |
| 1618 | spin_lock_init(&fs_info->delayed_iput_lock); |
| 1619 | |
| 1620 | init_completion(&fs_info->kobj_unregister); |
| 1621 | fs_info->tree_root = tree_root; |
| 1622 | fs_info->extent_root = extent_root; |
| 1623 | fs_info->csum_root = csum_root; |
| 1624 | fs_info->chunk_root = chunk_root; |
| 1625 | fs_info->dev_root = dev_root; |
| 1626 | fs_info->fs_devices = fs_devices; |
| 1627 | INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); |
| 1628 | INIT_LIST_HEAD(&fs_info->space_info); |
| 1629 | btrfs_mapping_init(&fs_info->mapping_tree); |
| 1630 | btrfs_init_block_rsv(&fs_info->global_block_rsv); |
| 1631 | btrfs_init_block_rsv(&fs_info->delalloc_block_rsv); |
| 1632 | btrfs_init_block_rsv(&fs_info->trans_block_rsv); |
| 1633 | btrfs_init_block_rsv(&fs_info->chunk_block_rsv); |
| 1634 | btrfs_init_block_rsv(&fs_info->empty_block_rsv); |
| 1635 | INIT_LIST_HEAD(&fs_info->durable_block_rsv_list); |
| 1636 | mutex_init(&fs_info->durable_block_rsv_mutex); |
| 1637 | atomic_set(&fs_info->nr_async_submits, 0); |
| 1638 | atomic_set(&fs_info->async_delalloc_pages, 0); |
| 1639 | atomic_set(&fs_info->async_submit_draining, 0); |
| 1640 | atomic_set(&fs_info->nr_async_bios, 0); |
| 1641 | fs_info->sb = sb; |
| 1642 | fs_info->max_inline = 8192 * 1024; |
| 1643 | fs_info->metadata_ratio = 0; |
| 1644 | |
| 1645 | fs_info->thread_pool_size = min_t(unsigned long, |
| 1646 | num_online_cpus() + 2, 8); |
| 1647 | |
| 1648 | INIT_LIST_HEAD(&fs_info->ordered_extents); |
| 1649 | spin_lock_init(&fs_info->ordered_extent_lock); |
| 1650 | |
| 1651 | sb->s_blocksize = 4096; |
| 1652 | sb->s_blocksize_bits = blksize_bits(4096); |
| 1653 | sb->s_bdi = &fs_info->bdi; |
| 1654 | |
| 1655 | fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; |
| 1656 | fs_info->btree_inode->i_nlink = 1; |
| 1657 | /* |
| 1658 | * we set the i_size on the btree inode to the max possible int. |
| 1659 | * the real end of the address space is determined by all of |
| 1660 | * the devices in the system |
| 1661 | */ |
| 1662 | fs_info->btree_inode->i_size = OFFSET_MAX; |
| 1663 | fs_info->btree_inode->i_mapping->a_ops = &btree_aops; |
| 1664 | fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; |
| 1665 | |
| 1666 | RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); |
| 1667 | extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, |
| 1668 | fs_info->btree_inode->i_mapping, |
| 1669 | GFP_NOFS); |
| 1670 | extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, |
| 1671 | GFP_NOFS); |
| 1672 | |
| 1673 | BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; |
| 1674 | |
| 1675 | BTRFS_I(fs_info->btree_inode)->root = tree_root; |
| 1676 | memset(&BTRFS_I(fs_info->btree_inode)->location, 0, |
| 1677 | sizeof(struct btrfs_key)); |
| 1678 | BTRFS_I(fs_info->btree_inode)->dummy_inode = 1; |
| 1679 | insert_inode_hash(fs_info->btree_inode); |
| 1680 | |
| 1681 | spin_lock_init(&fs_info->block_group_cache_lock); |
| 1682 | fs_info->block_group_cache_tree = RB_ROOT; |
| 1683 | |
| 1684 | extent_io_tree_init(&fs_info->freed_extents[0], |
| 1685 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
| 1686 | extent_io_tree_init(&fs_info->freed_extents[1], |
| 1687 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
| 1688 | fs_info->pinned_extents = &fs_info->freed_extents[0]; |
| 1689 | fs_info->do_barriers = 1; |
| 1690 | |
| 1691 | |
| 1692 | mutex_init(&fs_info->trans_mutex); |
| 1693 | mutex_init(&fs_info->ordered_operations_mutex); |
| 1694 | mutex_init(&fs_info->tree_log_mutex); |
| 1695 | mutex_init(&fs_info->chunk_mutex); |
| 1696 | mutex_init(&fs_info->transaction_kthread_mutex); |
| 1697 | mutex_init(&fs_info->cleaner_mutex); |
| 1698 | mutex_init(&fs_info->volume_mutex); |
| 1699 | init_rwsem(&fs_info->extent_commit_sem); |
| 1700 | init_rwsem(&fs_info->cleanup_work_sem); |
| 1701 | init_rwsem(&fs_info->subvol_sem); |
| 1702 | |
| 1703 | btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); |
| 1704 | btrfs_init_free_cluster(&fs_info->data_alloc_cluster); |
| 1705 | |
| 1706 | init_waitqueue_head(&fs_info->transaction_throttle); |
| 1707 | init_waitqueue_head(&fs_info->transaction_wait); |
| 1708 | init_waitqueue_head(&fs_info->transaction_blocked_wait); |
| 1709 | init_waitqueue_head(&fs_info->async_submit_wait); |
| 1710 | |
| 1711 | __setup_root(4096, 4096, 4096, 4096, tree_root, |
| 1712 | fs_info, BTRFS_ROOT_TREE_OBJECTID); |
| 1713 | |
| 1714 | bh = btrfs_read_dev_super(fs_devices->latest_bdev); |
| 1715 | if (!bh) |
| 1716 | goto fail_iput; |
| 1717 | |
| 1718 | memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); |
| 1719 | memcpy(&fs_info->super_for_commit, &fs_info->super_copy, |
| 1720 | sizeof(fs_info->super_for_commit)); |
| 1721 | brelse(bh); |
| 1722 | |
| 1723 | memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); |
| 1724 | |
| 1725 | disk_super = &fs_info->super_copy; |
| 1726 | if (!btrfs_super_root(disk_super)) |
| 1727 | goto fail_iput; |
| 1728 | |
| 1729 | ret = btrfs_parse_options(tree_root, options); |
| 1730 | if (ret) { |
| 1731 | err = ret; |
| 1732 | goto fail_iput; |
| 1733 | } |
| 1734 | |
| 1735 | features = btrfs_super_incompat_flags(disk_super) & |
| 1736 | ~BTRFS_FEATURE_INCOMPAT_SUPP; |
| 1737 | if (features) { |
| 1738 | printk(KERN_ERR "BTRFS: couldn't mount because of " |
| 1739 | "unsupported optional features (%Lx).\n", |
| 1740 | (unsigned long long)features); |
| 1741 | err = -EINVAL; |
| 1742 | goto fail_iput; |
| 1743 | } |
| 1744 | |
| 1745 | features = btrfs_super_incompat_flags(disk_super); |
| 1746 | if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) { |
| 1747 | features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; |
| 1748 | btrfs_set_super_incompat_flags(disk_super, features); |
| 1749 | } |
| 1750 | |
| 1751 | features = btrfs_super_compat_ro_flags(disk_super) & |
| 1752 | ~BTRFS_FEATURE_COMPAT_RO_SUPP; |
| 1753 | if (!(sb->s_flags & MS_RDONLY) && features) { |
| 1754 | printk(KERN_ERR "BTRFS: couldn't mount RDWR because of " |
| 1755 | "unsupported option features (%Lx).\n", |
| 1756 | (unsigned long long)features); |
| 1757 | err = -EINVAL; |
| 1758 | goto fail_iput; |
| 1759 | } |
| 1760 | |
| 1761 | btrfs_init_workers(&fs_info->generic_worker, |
| 1762 | "genwork", 1, NULL); |
| 1763 | |
| 1764 | btrfs_init_workers(&fs_info->workers, "worker", |
| 1765 | fs_info->thread_pool_size, |
| 1766 | &fs_info->generic_worker); |
| 1767 | |
| 1768 | btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", |
| 1769 | fs_info->thread_pool_size, |
| 1770 | &fs_info->generic_worker); |
| 1771 | |
| 1772 | btrfs_init_workers(&fs_info->submit_workers, "submit", |
| 1773 | min_t(u64, fs_devices->num_devices, |
| 1774 | fs_info->thread_pool_size), |
| 1775 | &fs_info->generic_worker); |
| 1776 | |
| 1777 | /* a higher idle thresh on the submit workers makes it much more |
| 1778 | * likely that bios will be send down in a sane order to the |
| 1779 | * devices |
| 1780 | */ |
| 1781 | fs_info->submit_workers.idle_thresh = 64; |
| 1782 | |
| 1783 | fs_info->workers.idle_thresh = 16; |
| 1784 | fs_info->workers.ordered = 1; |
| 1785 | |
| 1786 | fs_info->delalloc_workers.idle_thresh = 2; |
| 1787 | fs_info->delalloc_workers.ordered = 1; |
| 1788 | |
| 1789 | btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, |
| 1790 | &fs_info->generic_worker); |
| 1791 | btrfs_init_workers(&fs_info->endio_workers, "endio", |
| 1792 | fs_info->thread_pool_size, |
| 1793 | &fs_info->generic_worker); |
| 1794 | btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta", |
| 1795 | fs_info->thread_pool_size, |
| 1796 | &fs_info->generic_worker); |
| 1797 | btrfs_init_workers(&fs_info->endio_meta_write_workers, |
| 1798 | "endio-meta-write", fs_info->thread_pool_size, |
| 1799 | &fs_info->generic_worker); |
| 1800 | btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", |
| 1801 | fs_info->thread_pool_size, |
| 1802 | &fs_info->generic_worker); |
| 1803 | btrfs_init_workers(&fs_info->endio_freespace_worker, "freespace-write", |
| 1804 | 1, &fs_info->generic_worker); |
| 1805 | |
| 1806 | /* |
| 1807 | * endios are largely parallel and should have a very |
| 1808 | * low idle thresh |
| 1809 | */ |
| 1810 | fs_info->endio_workers.idle_thresh = 4; |
| 1811 | fs_info->endio_meta_workers.idle_thresh = 4; |
| 1812 | |
| 1813 | fs_info->endio_write_workers.idle_thresh = 2; |
| 1814 | fs_info->endio_meta_write_workers.idle_thresh = 2; |
| 1815 | |
| 1816 | btrfs_start_workers(&fs_info->workers, 1); |
| 1817 | btrfs_start_workers(&fs_info->generic_worker, 1); |
| 1818 | btrfs_start_workers(&fs_info->submit_workers, 1); |
| 1819 | btrfs_start_workers(&fs_info->delalloc_workers, 1); |
| 1820 | btrfs_start_workers(&fs_info->fixup_workers, 1); |
| 1821 | btrfs_start_workers(&fs_info->endio_workers, 1); |
| 1822 | btrfs_start_workers(&fs_info->endio_meta_workers, 1); |
| 1823 | btrfs_start_workers(&fs_info->endio_meta_write_workers, 1); |
| 1824 | btrfs_start_workers(&fs_info->endio_write_workers, 1); |
| 1825 | btrfs_start_workers(&fs_info->endio_freespace_worker, 1); |
| 1826 | |
| 1827 | fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); |
| 1828 | fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, |
| 1829 | 4 * 1024 * 1024 / PAGE_CACHE_SIZE); |
| 1830 | |
| 1831 | nodesize = btrfs_super_nodesize(disk_super); |
| 1832 | leafsize = btrfs_super_leafsize(disk_super); |
| 1833 | sectorsize = btrfs_super_sectorsize(disk_super); |
| 1834 | stripesize = btrfs_super_stripesize(disk_super); |
| 1835 | tree_root->nodesize = nodesize; |
| 1836 | tree_root->leafsize = leafsize; |
| 1837 | tree_root->sectorsize = sectorsize; |
| 1838 | tree_root->stripesize = stripesize; |
| 1839 | |
| 1840 | sb->s_blocksize = sectorsize; |
| 1841 | sb->s_blocksize_bits = blksize_bits(sectorsize); |
| 1842 | |
| 1843 | if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, |
| 1844 | sizeof(disk_super->magic))) { |
| 1845 | printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id); |
| 1846 | goto fail_sb_buffer; |
| 1847 | } |
| 1848 | |
| 1849 | mutex_lock(&fs_info->chunk_mutex); |
| 1850 | ret = btrfs_read_sys_array(tree_root); |
| 1851 | mutex_unlock(&fs_info->chunk_mutex); |
| 1852 | if (ret) { |
| 1853 | printk(KERN_WARNING "btrfs: failed to read the system " |
| 1854 | "array on %s\n", sb->s_id); |
| 1855 | goto fail_sb_buffer; |
| 1856 | } |
| 1857 | |
| 1858 | blocksize = btrfs_level_size(tree_root, |
| 1859 | btrfs_super_chunk_root_level(disk_super)); |
| 1860 | generation = btrfs_super_chunk_root_generation(disk_super); |
| 1861 | |
| 1862 | __setup_root(nodesize, leafsize, sectorsize, stripesize, |
| 1863 | chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); |
| 1864 | |
| 1865 | chunk_root->node = read_tree_block(chunk_root, |
| 1866 | btrfs_super_chunk_root(disk_super), |
| 1867 | blocksize, generation); |
| 1868 | BUG_ON(!chunk_root->node); |
| 1869 | if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { |
| 1870 | printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n", |
| 1871 | sb->s_id); |
| 1872 | goto fail_chunk_root; |
| 1873 | } |
| 1874 | btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); |
| 1875 | chunk_root->commit_root = btrfs_root_node(chunk_root); |
| 1876 | |
| 1877 | read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, |
| 1878 | (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), |
| 1879 | BTRFS_UUID_SIZE); |
| 1880 | |
| 1881 | mutex_lock(&fs_info->chunk_mutex); |
| 1882 | ret = btrfs_read_chunk_tree(chunk_root); |
| 1883 | mutex_unlock(&fs_info->chunk_mutex); |
| 1884 | if (ret) { |
| 1885 | printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n", |
| 1886 | sb->s_id); |
| 1887 | goto fail_chunk_root; |
| 1888 | } |
| 1889 | |
| 1890 | btrfs_close_extra_devices(fs_devices); |
| 1891 | |
| 1892 | blocksize = btrfs_level_size(tree_root, |
| 1893 | btrfs_super_root_level(disk_super)); |
| 1894 | generation = btrfs_super_generation(disk_super); |
| 1895 | |
| 1896 | tree_root->node = read_tree_block(tree_root, |
| 1897 | btrfs_super_root(disk_super), |
| 1898 | blocksize, generation); |
| 1899 | if (!tree_root->node) |
| 1900 | goto fail_chunk_root; |
| 1901 | if (!test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) { |
| 1902 | printk(KERN_WARNING "btrfs: failed to read tree root on %s\n", |
| 1903 | sb->s_id); |
| 1904 | goto fail_tree_root; |
| 1905 | } |
| 1906 | btrfs_set_root_node(&tree_root->root_item, tree_root->node); |
| 1907 | tree_root->commit_root = btrfs_root_node(tree_root); |
| 1908 | |
| 1909 | ret = find_and_setup_root(tree_root, fs_info, |
| 1910 | BTRFS_EXTENT_TREE_OBJECTID, extent_root); |
| 1911 | if (ret) |
| 1912 | goto fail_tree_root; |
| 1913 | extent_root->track_dirty = 1; |
| 1914 | |
| 1915 | ret = find_and_setup_root(tree_root, fs_info, |
| 1916 | BTRFS_DEV_TREE_OBJECTID, dev_root); |
| 1917 | if (ret) |
| 1918 | goto fail_extent_root; |
| 1919 | dev_root->track_dirty = 1; |
| 1920 | |
| 1921 | ret = find_and_setup_root(tree_root, fs_info, |
| 1922 | BTRFS_CSUM_TREE_OBJECTID, csum_root); |
| 1923 | if (ret) |
| 1924 | goto fail_dev_root; |
| 1925 | |
| 1926 | csum_root->track_dirty = 1; |
| 1927 | |
| 1928 | fs_info->generation = generation; |
| 1929 | fs_info->last_trans_committed = generation; |
| 1930 | fs_info->data_alloc_profile = (u64)-1; |
| 1931 | fs_info->metadata_alloc_profile = (u64)-1; |
| 1932 | fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; |
| 1933 | |
| 1934 | ret = btrfs_read_block_groups(extent_root); |
| 1935 | if (ret) { |
| 1936 | printk(KERN_ERR "Failed to read block groups: %d\n", ret); |
| 1937 | goto fail_block_groups; |
| 1938 | } |
| 1939 | |
| 1940 | fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, |
| 1941 | "btrfs-cleaner"); |
| 1942 | if (IS_ERR(fs_info->cleaner_kthread)) |
| 1943 | goto fail_block_groups; |
| 1944 | |
| 1945 | fs_info->transaction_kthread = kthread_run(transaction_kthread, |
| 1946 | tree_root, |
| 1947 | "btrfs-transaction"); |
| 1948 | if (IS_ERR(fs_info->transaction_kthread)) |
| 1949 | goto fail_cleaner; |
| 1950 | |
| 1951 | if (!btrfs_test_opt(tree_root, SSD) && |
| 1952 | !btrfs_test_opt(tree_root, NOSSD) && |
| 1953 | !fs_info->fs_devices->rotating) { |
| 1954 | printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD " |
| 1955 | "mode\n"); |
| 1956 | btrfs_set_opt(fs_info->mount_opt, SSD); |
| 1957 | } |
| 1958 | |
| 1959 | if (btrfs_super_log_root(disk_super) != 0) { |
| 1960 | u64 bytenr = btrfs_super_log_root(disk_super); |
| 1961 | |
| 1962 | if (fs_devices->rw_devices == 0) { |
| 1963 | printk(KERN_WARNING "Btrfs log replay required " |
| 1964 | "on RO media\n"); |
| 1965 | err = -EIO; |
| 1966 | goto fail_trans_kthread; |
| 1967 | } |
| 1968 | blocksize = |
| 1969 | btrfs_level_size(tree_root, |
| 1970 | btrfs_super_log_root_level(disk_super)); |
| 1971 | |
| 1972 | log_tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS); |
| 1973 | if (!log_tree_root) { |
| 1974 | err = -ENOMEM; |
| 1975 | goto fail_trans_kthread; |
| 1976 | } |
| 1977 | |
| 1978 | __setup_root(nodesize, leafsize, sectorsize, stripesize, |
| 1979 | log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); |
| 1980 | |
| 1981 | log_tree_root->node = read_tree_block(tree_root, bytenr, |
| 1982 | blocksize, |
| 1983 | generation + 1); |
| 1984 | ret = btrfs_recover_log_trees(log_tree_root); |
| 1985 | BUG_ON(ret); |
| 1986 | |
| 1987 | if (sb->s_flags & MS_RDONLY) { |
| 1988 | ret = btrfs_commit_super(tree_root); |
| 1989 | BUG_ON(ret); |
| 1990 | } |
| 1991 | } |
| 1992 | |
| 1993 | ret = btrfs_find_orphan_roots(tree_root); |
| 1994 | BUG_ON(ret); |
| 1995 | |
| 1996 | if (!(sb->s_flags & MS_RDONLY)) { |
| 1997 | ret = btrfs_cleanup_fs_roots(fs_info); |
| 1998 | BUG_ON(ret); |
| 1999 | |
| 2000 | ret = btrfs_recover_relocation(tree_root); |
| 2001 | if (ret < 0) { |
| 2002 | printk(KERN_WARNING |
| 2003 | "btrfs: failed to recover relocation\n"); |
| 2004 | err = -EINVAL; |
| 2005 | goto fail_trans_kthread; |
| 2006 | } |
| 2007 | } |
| 2008 | |
| 2009 | location.objectid = BTRFS_FS_TREE_OBJECTID; |
| 2010 | location.type = BTRFS_ROOT_ITEM_KEY; |
| 2011 | location.offset = (u64)-1; |
| 2012 | |
| 2013 | fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); |
| 2014 | if (!fs_info->fs_root) |
| 2015 | goto fail_trans_kthread; |
| 2016 | if (IS_ERR(fs_info->fs_root)) { |
| 2017 | err = PTR_ERR(fs_info->fs_root); |
| 2018 | goto fail_trans_kthread; |
| 2019 | } |
| 2020 | |
| 2021 | if (!(sb->s_flags & MS_RDONLY)) { |
| 2022 | down_read(&fs_info->cleanup_work_sem); |
| 2023 | btrfs_orphan_cleanup(fs_info->fs_root); |
| 2024 | btrfs_orphan_cleanup(fs_info->tree_root); |
| 2025 | up_read(&fs_info->cleanup_work_sem); |
| 2026 | } |
| 2027 | |
| 2028 | return tree_root; |
| 2029 | |
| 2030 | fail_trans_kthread: |
| 2031 | kthread_stop(fs_info->transaction_kthread); |
| 2032 | fail_cleaner: |
| 2033 | kthread_stop(fs_info->cleaner_kthread); |
| 2034 | |
| 2035 | /* |
| 2036 | * make sure we're done with the btree inode before we stop our |
| 2037 | * kthreads |
| 2038 | */ |
| 2039 | filemap_write_and_wait(fs_info->btree_inode->i_mapping); |
| 2040 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); |
| 2041 | |
| 2042 | fail_block_groups: |
| 2043 | btrfs_free_block_groups(fs_info); |
| 2044 | free_extent_buffer(csum_root->node); |
| 2045 | free_extent_buffer(csum_root->commit_root); |
| 2046 | fail_dev_root: |
| 2047 | free_extent_buffer(dev_root->node); |
| 2048 | free_extent_buffer(dev_root->commit_root); |
| 2049 | fail_extent_root: |
| 2050 | free_extent_buffer(extent_root->node); |
| 2051 | free_extent_buffer(extent_root->commit_root); |
| 2052 | fail_tree_root: |
| 2053 | free_extent_buffer(tree_root->node); |
| 2054 | free_extent_buffer(tree_root->commit_root); |
| 2055 | fail_chunk_root: |
| 2056 | free_extent_buffer(chunk_root->node); |
| 2057 | free_extent_buffer(chunk_root->commit_root); |
| 2058 | fail_sb_buffer: |
| 2059 | btrfs_stop_workers(&fs_info->generic_worker); |
| 2060 | btrfs_stop_workers(&fs_info->fixup_workers); |
| 2061 | btrfs_stop_workers(&fs_info->delalloc_workers); |
| 2062 | btrfs_stop_workers(&fs_info->workers); |
| 2063 | btrfs_stop_workers(&fs_info->endio_workers); |
| 2064 | btrfs_stop_workers(&fs_info->endio_meta_workers); |
| 2065 | btrfs_stop_workers(&fs_info->endio_meta_write_workers); |
| 2066 | btrfs_stop_workers(&fs_info->endio_write_workers); |
| 2067 | btrfs_stop_workers(&fs_info->endio_freespace_worker); |
| 2068 | btrfs_stop_workers(&fs_info->submit_workers); |
| 2069 | fail_iput: |
| 2070 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); |
| 2071 | iput(fs_info->btree_inode); |
| 2072 | |
| 2073 | btrfs_close_devices(fs_info->fs_devices); |
| 2074 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
| 2075 | fail_bdi: |
| 2076 | bdi_destroy(&fs_info->bdi); |
| 2077 | fail_srcu: |
| 2078 | cleanup_srcu_struct(&fs_info->subvol_srcu); |
| 2079 | fail: |
| 2080 | kfree(extent_root); |
| 2081 | kfree(tree_root); |
| 2082 | kfree(fs_info); |
| 2083 | kfree(chunk_root); |
| 2084 | kfree(dev_root); |
| 2085 | kfree(csum_root); |
| 2086 | return ERR_PTR(err); |
| 2087 | } |
| 2088 | |
| 2089 | static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) |
| 2090 | { |
| 2091 | char b[BDEVNAME_SIZE]; |
| 2092 | |
| 2093 | if (uptodate) { |
| 2094 | set_buffer_uptodate(bh); |
| 2095 | } else { |
| 2096 | if (!buffer_eopnotsupp(bh) && printk_ratelimit()) { |
| 2097 | printk(KERN_WARNING "lost page write due to " |
| 2098 | "I/O error on %s\n", |
| 2099 | bdevname(bh->b_bdev, b)); |
| 2100 | } |
| 2101 | /* note, we dont' set_buffer_write_io_error because we have |
| 2102 | * our own ways of dealing with the IO errors |
| 2103 | */ |
| 2104 | clear_buffer_uptodate(bh); |
| 2105 | } |
| 2106 | unlock_buffer(bh); |
| 2107 | put_bh(bh); |
| 2108 | } |
| 2109 | |
| 2110 | struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) |
| 2111 | { |
| 2112 | struct buffer_head *bh; |
| 2113 | struct buffer_head *latest = NULL; |
| 2114 | struct btrfs_super_block *super; |
| 2115 | int i; |
| 2116 | u64 transid = 0; |
| 2117 | u64 bytenr; |
| 2118 | |
| 2119 | /* we would like to check all the supers, but that would make |
| 2120 | * a btrfs mount succeed after a mkfs from a different FS. |
| 2121 | * So, we need to add a special mount option to scan for |
| 2122 | * later supers, using BTRFS_SUPER_MIRROR_MAX instead |
| 2123 | */ |
| 2124 | for (i = 0; i < 1; i++) { |
| 2125 | bytenr = btrfs_sb_offset(i); |
| 2126 | if (bytenr + 4096 >= i_size_read(bdev->bd_inode)) |
| 2127 | break; |
| 2128 | bh = __bread(bdev, bytenr / 4096, 4096); |
| 2129 | if (!bh) |
| 2130 | continue; |
| 2131 | |
| 2132 | super = (struct btrfs_super_block *)bh->b_data; |
| 2133 | if (btrfs_super_bytenr(super) != bytenr || |
| 2134 | strncmp((char *)(&super->magic), BTRFS_MAGIC, |
| 2135 | sizeof(super->magic))) { |
| 2136 | brelse(bh); |
| 2137 | continue; |
| 2138 | } |
| 2139 | |
| 2140 | if (!latest || btrfs_super_generation(super) > transid) { |
| 2141 | brelse(latest); |
| 2142 | latest = bh; |
| 2143 | transid = btrfs_super_generation(super); |
| 2144 | } else { |
| 2145 | brelse(bh); |
| 2146 | } |
| 2147 | } |
| 2148 | return latest; |
| 2149 | } |
| 2150 | |
| 2151 | /* |
| 2152 | * this should be called twice, once with wait == 0 and |
| 2153 | * once with wait == 1. When wait == 0 is done, all the buffer heads |
| 2154 | * we write are pinned. |
| 2155 | * |
| 2156 | * They are released when wait == 1 is done. |
| 2157 | * max_mirrors must be the same for both runs, and it indicates how |
| 2158 | * many supers on this one device should be written. |
| 2159 | * |
| 2160 | * max_mirrors == 0 means to write them all. |
| 2161 | */ |
| 2162 | static int write_dev_supers(struct btrfs_device *device, |
| 2163 | struct btrfs_super_block *sb, |
| 2164 | int do_barriers, int wait, int max_mirrors) |
| 2165 | { |
| 2166 | struct buffer_head *bh; |
| 2167 | int i; |
| 2168 | int ret; |
| 2169 | int errors = 0; |
| 2170 | u32 crc; |
| 2171 | u64 bytenr; |
| 2172 | int last_barrier = 0; |
| 2173 | |
| 2174 | if (max_mirrors == 0) |
| 2175 | max_mirrors = BTRFS_SUPER_MIRROR_MAX; |
| 2176 | |
| 2177 | /* make sure only the last submit_bh does a barrier */ |
| 2178 | if (do_barriers) { |
| 2179 | for (i = 0; i < max_mirrors; i++) { |
| 2180 | bytenr = btrfs_sb_offset(i); |
| 2181 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= |
| 2182 | device->total_bytes) |
| 2183 | break; |
| 2184 | last_barrier = i; |
| 2185 | } |
| 2186 | } |
| 2187 | |
| 2188 | for (i = 0; i < max_mirrors; i++) { |
| 2189 | bytenr = btrfs_sb_offset(i); |
| 2190 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) |
| 2191 | break; |
| 2192 | |
| 2193 | if (wait) { |
| 2194 | bh = __find_get_block(device->bdev, bytenr / 4096, |
| 2195 | BTRFS_SUPER_INFO_SIZE); |
| 2196 | BUG_ON(!bh); |
| 2197 | wait_on_buffer(bh); |
| 2198 | if (!buffer_uptodate(bh)) |
| 2199 | errors++; |
| 2200 | |
| 2201 | /* drop our reference */ |
| 2202 | brelse(bh); |
| 2203 | |
| 2204 | /* drop the reference from the wait == 0 run */ |
| 2205 | brelse(bh); |
| 2206 | continue; |
| 2207 | } else { |
| 2208 | btrfs_set_super_bytenr(sb, bytenr); |
| 2209 | |
| 2210 | crc = ~(u32)0; |
| 2211 | crc = btrfs_csum_data(NULL, (char *)sb + |
| 2212 | BTRFS_CSUM_SIZE, crc, |
| 2213 | BTRFS_SUPER_INFO_SIZE - |
| 2214 | BTRFS_CSUM_SIZE); |
| 2215 | btrfs_csum_final(crc, sb->csum); |
| 2216 | |
| 2217 | /* |
| 2218 | * one reference for us, and we leave it for the |
| 2219 | * caller |
| 2220 | */ |
| 2221 | bh = __getblk(device->bdev, bytenr / 4096, |
| 2222 | BTRFS_SUPER_INFO_SIZE); |
| 2223 | memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); |
| 2224 | |
| 2225 | /* one reference for submit_bh */ |
| 2226 | get_bh(bh); |
| 2227 | |
| 2228 | set_buffer_uptodate(bh); |
| 2229 | lock_buffer(bh); |
| 2230 | bh->b_end_io = btrfs_end_buffer_write_sync; |
| 2231 | } |
| 2232 | |
| 2233 | if (i == last_barrier && do_barriers && device->barriers) { |
| 2234 | ret = submit_bh(WRITE_BARRIER, bh); |
| 2235 | if (ret == -EOPNOTSUPP) { |
| 2236 | printk("btrfs: disabling barriers on dev %s\n", |
| 2237 | device->name); |
| 2238 | set_buffer_uptodate(bh); |
| 2239 | device->barriers = 0; |
| 2240 | /* one reference for submit_bh */ |
| 2241 | get_bh(bh); |
| 2242 | lock_buffer(bh); |
| 2243 | ret = submit_bh(WRITE_SYNC, bh); |
| 2244 | } |
| 2245 | } else { |
| 2246 | ret = submit_bh(WRITE_SYNC, bh); |
| 2247 | } |
| 2248 | |
| 2249 | if (ret) |
| 2250 | errors++; |
| 2251 | } |
| 2252 | return errors < i ? 0 : -1; |
| 2253 | } |
| 2254 | |
| 2255 | int write_all_supers(struct btrfs_root *root, int max_mirrors) |
| 2256 | { |
| 2257 | struct list_head *head; |
| 2258 | struct btrfs_device *dev; |
| 2259 | struct btrfs_super_block *sb; |
| 2260 | struct btrfs_dev_item *dev_item; |
| 2261 | int ret; |
| 2262 | int do_barriers; |
| 2263 | int max_errors; |
| 2264 | int total_errors = 0; |
| 2265 | u64 flags; |
| 2266 | |
| 2267 | max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; |
| 2268 | do_barriers = !btrfs_test_opt(root, NOBARRIER); |
| 2269 | |
| 2270 | sb = &root->fs_info->super_for_commit; |
| 2271 | dev_item = &sb->dev_item; |
| 2272 | |
| 2273 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
| 2274 | head = &root->fs_info->fs_devices->devices; |
| 2275 | list_for_each_entry(dev, head, dev_list) { |
| 2276 | if (!dev->bdev) { |
| 2277 | total_errors++; |
| 2278 | continue; |
| 2279 | } |
| 2280 | if (!dev->in_fs_metadata || !dev->writeable) |
| 2281 | continue; |
| 2282 | |
| 2283 | btrfs_set_stack_device_generation(dev_item, 0); |
| 2284 | btrfs_set_stack_device_type(dev_item, dev->type); |
| 2285 | btrfs_set_stack_device_id(dev_item, dev->devid); |
| 2286 | btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); |
| 2287 | btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); |
| 2288 | btrfs_set_stack_device_io_align(dev_item, dev->io_align); |
| 2289 | btrfs_set_stack_device_io_width(dev_item, dev->io_width); |
| 2290 | btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); |
| 2291 | memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); |
| 2292 | memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); |
| 2293 | |
| 2294 | flags = btrfs_super_flags(sb); |
| 2295 | btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); |
| 2296 | |
| 2297 | ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); |
| 2298 | if (ret) |
| 2299 | total_errors++; |
| 2300 | } |
| 2301 | if (total_errors > max_errors) { |
| 2302 | printk(KERN_ERR "btrfs: %d errors while writing supers\n", |
| 2303 | total_errors); |
| 2304 | BUG(); |
| 2305 | } |
| 2306 | |
| 2307 | total_errors = 0; |
| 2308 | list_for_each_entry(dev, head, dev_list) { |
| 2309 | if (!dev->bdev) |
| 2310 | continue; |
| 2311 | if (!dev->in_fs_metadata || !dev->writeable) |
| 2312 | continue; |
| 2313 | |
| 2314 | ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); |
| 2315 | if (ret) |
| 2316 | total_errors++; |
| 2317 | } |
| 2318 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 2319 | if (total_errors > max_errors) { |
| 2320 | printk(KERN_ERR "btrfs: %d errors while writing supers\n", |
| 2321 | total_errors); |
| 2322 | BUG(); |
| 2323 | } |
| 2324 | return 0; |
| 2325 | } |
| 2326 | |
| 2327 | int write_ctree_super(struct btrfs_trans_handle *trans, |
| 2328 | struct btrfs_root *root, int max_mirrors) |
| 2329 | { |
| 2330 | int ret; |
| 2331 | |
| 2332 | ret = write_all_supers(root, max_mirrors); |
| 2333 | return ret; |
| 2334 | } |
| 2335 | |
| 2336 | int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) |
| 2337 | { |
| 2338 | spin_lock(&fs_info->fs_roots_radix_lock); |
| 2339 | radix_tree_delete(&fs_info->fs_roots_radix, |
| 2340 | (unsigned long)root->root_key.objectid); |
| 2341 | spin_unlock(&fs_info->fs_roots_radix_lock); |
| 2342 | |
| 2343 | if (btrfs_root_refs(&root->root_item) == 0) |
| 2344 | synchronize_srcu(&fs_info->subvol_srcu); |
| 2345 | |
| 2346 | free_fs_root(root); |
| 2347 | return 0; |
| 2348 | } |
| 2349 | |
| 2350 | static void free_fs_root(struct btrfs_root *root) |
| 2351 | { |
| 2352 | WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); |
| 2353 | if (root->anon_super.s_dev) { |
| 2354 | down_write(&root->anon_super.s_umount); |
| 2355 | kill_anon_super(&root->anon_super); |
| 2356 | } |
| 2357 | free_extent_buffer(root->node); |
| 2358 | free_extent_buffer(root->commit_root); |
| 2359 | kfree(root->name); |
| 2360 | kfree(root); |
| 2361 | } |
| 2362 | |
| 2363 | static int del_fs_roots(struct btrfs_fs_info *fs_info) |
| 2364 | { |
| 2365 | int ret; |
| 2366 | struct btrfs_root *gang[8]; |
| 2367 | int i; |
| 2368 | |
| 2369 | while (!list_empty(&fs_info->dead_roots)) { |
| 2370 | gang[0] = list_entry(fs_info->dead_roots.next, |
| 2371 | struct btrfs_root, root_list); |
| 2372 | list_del(&gang[0]->root_list); |
| 2373 | |
| 2374 | if (gang[0]->in_radix) { |
| 2375 | btrfs_free_fs_root(fs_info, gang[0]); |
| 2376 | } else { |
| 2377 | free_extent_buffer(gang[0]->node); |
| 2378 | free_extent_buffer(gang[0]->commit_root); |
| 2379 | kfree(gang[0]); |
| 2380 | } |
| 2381 | } |
| 2382 | |
| 2383 | while (1) { |
| 2384 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, |
| 2385 | (void **)gang, 0, |
| 2386 | ARRAY_SIZE(gang)); |
| 2387 | if (!ret) |
| 2388 | break; |
| 2389 | for (i = 0; i < ret; i++) |
| 2390 | btrfs_free_fs_root(fs_info, gang[i]); |
| 2391 | } |
| 2392 | return 0; |
| 2393 | } |
| 2394 | |
| 2395 | int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) |
| 2396 | { |
| 2397 | u64 root_objectid = 0; |
| 2398 | struct btrfs_root *gang[8]; |
| 2399 | int i; |
| 2400 | int ret; |
| 2401 | |
| 2402 | while (1) { |
| 2403 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, |
| 2404 | (void **)gang, root_objectid, |
| 2405 | ARRAY_SIZE(gang)); |
| 2406 | if (!ret) |
| 2407 | break; |
| 2408 | |
| 2409 | root_objectid = gang[ret - 1]->root_key.objectid + 1; |
| 2410 | for (i = 0; i < ret; i++) { |
| 2411 | root_objectid = gang[i]->root_key.objectid; |
| 2412 | btrfs_orphan_cleanup(gang[i]); |
| 2413 | } |
| 2414 | root_objectid++; |
| 2415 | } |
| 2416 | return 0; |
| 2417 | } |
| 2418 | |
| 2419 | int btrfs_commit_super(struct btrfs_root *root) |
| 2420 | { |
| 2421 | struct btrfs_trans_handle *trans; |
| 2422 | int ret; |
| 2423 | |
| 2424 | mutex_lock(&root->fs_info->cleaner_mutex); |
| 2425 | btrfs_run_delayed_iputs(root); |
| 2426 | btrfs_clean_old_snapshots(root); |
| 2427 | mutex_unlock(&root->fs_info->cleaner_mutex); |
| 2428 | |
| 2429 | /* wait until ongoing cleanup work done */ |
| 2430 | down_write(&root->fs_info->cleanup_work_sem); |
| 2431 | up_write(&root->fs_info->cleanup_work_sem); |
| 2432 | |
| 2433 | trans = btrfs_join_transaction(root, 1); |
| 2434 | ret = btrfs_commit_transaction(trans, root); |
| 2435 | BUG_ON(ret); |
| 2436 | /* run commit again to drop the original snapshot */ |
| 2437 | trans = btrfs_join_transaction(root, 1); |
| 2438 | btrfs_commit_transaction(trans, root); |
| 2439 | ret = btrfs_write_and_wait_transaction(NULL, root); |
| 2440 | BUG_ON(ret); |
| 2441 | |
| 2442 | ret = write_ctree_super(NULL, root, 0); |
| 2443 | return ret; |
| 2444 | } |
| 2445 | |
| 2446 | int close_ctree(struct btrfs_root *root) |
| 2447 | { |
| 2448 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2449 | int ret; |
| 2450 | |
| 2451 | fs_info->closing = 1; |
| 2452 | smp_mb(); |
| 2453 | |
| 2454 | btrfs_put_block_group_cache(fs_info); |
| 2455 | if (!(fs_info->sb->s_flags & MS_RDONLY)) { |
| 2456 | ret = btrfs_commit_super(root); |
| 2457 | if (ret) |
| 2458 | printk(KERN_ERR "btrfs: commit super ret %d\n", ret); |
| 2459 | } |
| 2460 | |
| 2461 | kthread_stop(root->fs_info->transaction_kthread); |
| 2462 | kthread_stop(root->fs_info->cleaner_kthread); |
| 2463 | |
| 2464 | fs_info->closing = 2; |
| 2465 | smp_mb(); |
| 2466 | |
| 2467 | if (fs_info->delalloc_bytes) { |
| 2468 | printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n", |
| 2469 | (unsigned long long)fs_info->delalloc_bytes); |
| 2470 | } |
| 2471 | if (fs_info->total_ref_cache_size) { |
| 2472 | printk(KERN_INFO "btrfs: at umount reference cache size %llu\n", |
| 2473 | (unsigned long long)fs_info->total_ref_cache_size); |
| 2474 | } |
| 2475 | |
| 2476 | free_extent_buffer(fs_info->extent_root->node); |
| 2477 | free_extent_buffer(fs_info->extent_root->commit_root); |
| 2478 | free_extent_buffer(fs_info->tree_root->node); |
| 2479 | free_extent_buffer(fs_info->tree_root->commit_root); |
| 2480 | free_extent_buffer(root->fs_info->chunk_root->node); |
| 2481 | free_extent_buffer(root->fs_info->chunk_root->commit_root); |
| 2482 | free_extent_buffer(root->fs_info->dev_root->node); |
| 2483 | free_extent_buffer(root->fs_info->dev_root->commit_root); |
| 2484 | free_extent_buffer(root->fs_info->csum_root->node); |
| 2485 | free_extent_buffer(root->fs_info->csum_root->commit_root); |
| 2486 | |
| 2487 | btrfs_free_block_groups(root->fs_info); |
| 2488 | |
| 2489 | del_fs_roots(fs_info); |
| 2490 | |
| 2491 | iput(fs_info->btree_inode); |
| 2492 | |
| 2493 | btrfs_stop_workers(&fs_info->generic_worker); |
| 2494 | btrfs_stop_workers(&fs_info->fixup_workers); |
| 2495 | btrfs_stop_workers(&fs_info->delalloc_workers); |
| 2496 | btrfs_stop_workers(&fs_info->workers); |
| 2497 | btrfs_stop_workers(&fs_info->endio_workers); |
| 2498 | btrfs_stop_workers(&fs_info->endio_meta_workers); |
| 2499 | btrfs_stop_workers(&fs_info->endio_meta_write_workers); |
| 2500 | btrfs_stop_workers(&fs_info->endio_write_workers); |
| 2501 | btrfs_stop_workers(&fs_info->endio_freespace_worker); |
| 2502 | btrfs_stop_workers(&fs_info->submit_workers); |
| 2503 | |
| 2504 | btrfs_close_devices(fs_info->fs_devices); |
| 2505 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
| 2506 | |
| 2507 | bdi_destroy(&fs_info->bdi); |
| 2508 | cleanup_srcu_struct(&fs_info->subvol_srcu); |
| 2509 | |
| 2510 | kfree(fs_info->extent_root); |
| 2511 | kfree(fs_info->tree_root); |
| 2512 | kfree(fs_info->chunk_root); |
| 2513 | kfree(fs_info->dev_root); |
| 2514 | kfree(fs_info->csum_root); |
| 2515 | return 0; |
| 2516 | } |
| 2517 | |
| 2518 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) |
| 2519 | { |
| 2520 | int ret; |
| 2521 | struct inode *btree_inode = buf->first_page->mapping->host; |
| 2522 | |
| 2523 | ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf, |
| 2524 | NULL); |
| 2525 | if (!ret) |
| 2526 | return ret; |
| 2527 | |
| 2528 | ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, |
| 2529 | parent_transid); |
| 2530 | return !ret; |
| 2531 | } |
| 2532 | |
| 2533 | int btrfs_set_buffer_uptodate(struct extent_buffer *buf) |
| 2534 | { |
| 2535 | struct inode *btree_inode = buf->first_page->mapping->host; |
| 2536 | return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, |
| 2537 | buf); |
| 2538 | } |
| 2539 | |
| 2540 | void btrfs_mark_buffer_dirty(struct extent_buffer *buf) |
| 2541 | { |
| 2542 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
| 2543 | u64 transid = btrfs_header_generation(buf); |
| 2544 | struct inode *btree_inode = root->fs_info->btree_inode; |
| 2545 | int was_dirty; |
| 2546 | |
| 2547 | btrfs_assert_tree_locked(buf); |
| 2548 | if (transid != root->fs_info->generation) { |
| 2549 | printk(KERN_CRIT "btrfs transid mismatch buffer %llu, " |
| 2550 | "found %llu running %llu\n", |
| 2551 | (unsigned long long)buf->start, |
| 2552 | (unsigned long long)transid, |
| 2553 | (unsigned long long)root->fs_info->generation); |
| 2554 | WARN_ON(1); |
| 2555 | } |
| 2556 | was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, |
| 2557 | buf); |
| 2558 | if (!was_dirty) { |
| 2559 | spin_lock(&root->fs_info->delalloc_lock); |
| 2560 | root->fs_info->dirty_metadata_bytes += buf->len; |
| 2561 | spin_unlock(&root->fs_info->delalloc_lock); |
| 2562 | } |
| 2563 | } |
| 2564 | |
| 2565 | void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) |
| 2566 | { |
| 2567 | /* |
| 2568 | * looks as though older kernels can get into trouble with |
| 2569 | * this code, they end up stuck in balance_dirty_pages forever |
| 2570 | */ |
| 2571 | u64 num_dirty; |
| 2572 | unsigned long thresh = 32 * 1024 * 1024; |
| 2573 | |
| 2574 | if (current->flags & PF_MEMALLOC) |
| 2575 | return; |
| 2576 | |
| 2577 | num_dirty = root->fs_info->dirty_metadata_bytes; |
| 2578 | |
| 2579 | if (num_dirty > thresh) { |
| 2580 | balance_dirty_pages_ratelimited_nr( |
| 2581 | root->fs_info->btree_inode->i_mapping, 1); |
| 2582 | } |
| 2583 | return; |
| 2584 | } |
| 2585 | |
| 2586 | int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) |
| 2587 | { |
| 2588 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
| 2589 | int ret; |
| 2590 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
| 2591 | if (ret == 0) |
| 2592 | set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); |
| 2593 | return ret; |
| 2594 | } |
| 2595 | |
| 2596 | int btree_lock_page_hook(struct page *page) |
| 2597 | { |
| 2598 | struct inode *inode = page->mapping->host; |
| 2599 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2600 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 2601 | struct extent_buffer *eb; |
| 2602 | unsigned long len; |
| 2603 | u64 bytenr = page_offset(page); |
| 2604 | |
| 2605 | if (page->private == EXTENT_PAGE_PRIVATE) |
| 2606 | goto out; |
| 2607 | |
| 2608 | len = page->private >> 2; |
| 2609 | eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS); |
| 2610 | if (!eb) |
| 2611 | goto out; |
| 2612 | |
| 2613 | btrfs_tree_lock(eb); |
| 2614 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
| 2615 | |
| 2616 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { |
| 2617 | spin_lock(&root->fs_info->delalloc_lock); |
| 2618 | if (root->fs_info->dirty_metadata_bytes >= eb->len) |
| 2619 | root->fs_info->dirty_metadata_bytes -= eb->len; |
| 2620 | else |
| 2621 | WARN_ON(1); |
| 2622 | spin_unlock(&root->fs_info->delalloc_lock); |
| 2623 | } |
| 2624 | |
| 2625 | btrfs_tree_unlock(eb); |
| 2626 | free_extent_buffer(eb); |
| 2627 | out: |
| 2628 | lock_page(page); |
| 2629 | return 0; |
| 2630 | } |
| 2631 | |
| 2632 | static struct extent_io_ops btree_extent_io_ops = { |
| 2633 | .write_cache_pages_lock_hook = btree_lock_page_hook, |
| 2634 | .readpage_end_io_hook = btree_readpage_end_io_hook, |
| 2635 | .submit_bio_hook = btree_submit_bio_hook, |
| 2636 | /* note we're sharing with inode.c for the merge bio hook */ |
| 2637 | .merge_bio_hook = btrfs_merge_bio_hook, |
| 2638 | }; |