| 1 | /* |
| 2 | * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved. |
| 3 | * |
| 4 | * This code is derived from software contributed to The DragonFly Project |
| 5 | * by Matthew Dillon <dillon@backplane.com> |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in |
| 15 | * the documentation and/or other materials provided with the |
| 16 | * distribution. |
| 17 | * 3. Neither the name of The DragonFly Project nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived |
| 19 | * from this software without specific, prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 25 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 26 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 27 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 28 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 29 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 30 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 31 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | * |
| 34 | * $DragonFly: src/sys/vfs/hammer/hammer_object.c,v 1.97 2008/09/23 22:28:56 dillon Exp $ |
| 35 | */ |
| 36 | |
| 37 | #include "hammer.h" |
| 38 | |
| 39 | static int hammer_mem_lookup(hammer_cursor_t cursor); |
| 40 | static void hammer_mem_first(hammer_cursor_t cursor); |
| 41 | static int hammer_frontend_trunc_callback(hammer_record_t record, |
| 42 | void *data __unused); |
| 43 | static int hammer_bulk_scan_callback(hammer_record_t record, void *data); |
| 44 | static int hammer_record_needs_overwrite_delete(hammer_record_t record); |
| 45 | static int hammer_delete_general(hammer_cursor_t cursor, hammer_inode_t ip, |
| 46 | hammer_btree_leaf_elm_t leaf); |
| 47 | static int hammer_cursor_localize_data(hammer_data_ondisk_t data, |
| 48 | hammer_btree_leaf_elm_t leaf); |
| 49 | |
| 50 | struct rec_trunc_info { |
| 51 | u_int16_t rec_type; |
| 52 | int64_t trunc_off; |
| 53 | }; |
| 54 | |
| 55 | struct hammer_bulk_info { |
| 56 | hammer_record_t record; |
| 57 | hammer_record_t conflict; |
| 58 | }; |
| 59 | |
| 60 | /* |
| 61 | * Red-black tree support. Comparison code for insertion. |
| 62 | */ |
| 63 | static int |
| 64 | hammer_rec_rb_compare(hammer_record_t rec1, hammer_record_t rec2) |
| 65 | { |
| 66 | if (rec1->leaf.base.rec_type < rec2->leaf.base.rec_type) |
| 67 | return(-1); |
| 68 | if (rec1->leaf.base.rec_type > rec2->leaf.base.rec_type) |
| 69 | return(1); |
| 70 | |
| 71 | if (rec1->leaf.base.key < rec2->leaf.base.key) |
| 72 | return(-1); |
| 73 | if (rec1->leaf.base.key > rec2->leaf.base.key) |
| 74 | return(1); |
| 75 | |
| 76 | /* |
| 77 | * For search & insertion purposes records deleted by the |
| 78 | * frontend or deleted/committed by the backend are silently |
| 79 | * ignored. Otherwise pipelined insertions will get messed |
| 80 | * up. |
| 81 | * |
| 82 | * rec1 is greater then rec2 if rec1 is marked deleted. |
| 83 | * rec1 is less then rec2 if rec2 is marked deleted. |
| 84 | * |
| 85 | * Multiple deleted records may be present, do not return 0 |
| 86 | * if both are marked deleted. |
| 87 | */ |
| 88 | if (rec1->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | |
| 89 | HAMMER_RECF_COMMITTED)) { |
| 90 | return(1); |
| 91 | } |
| 92 | if (rec2->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | |
| 93 | HAMMER_RECF_COMMITTED)) { |
| 94 | return(-1); |
| 95 | } |
| 96 | |
| 97 | return(0); |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * Basic record comparison code similar to hammer_btree_cmp(). |
| 102 | * |
| 103 | * obj_id is not compared and may not yet be assigned in the record. |
| 104 | */ |
| 105 | static int |
| 106 | hammer_rec_cmp(hammer_base_elm_t elm, hammer_record_t rec) |
| 107 | { |
| 108 | if (elm->rec_type < rec->leaf.base.rec_type) |
| 109 | return(-3); |
| 110 | if (elm->rec_type > rec->leaf.base.rec_type) |
| 111 | return(3); |
| 112 | |
| 113 | if (elm->key < rec->leaf.base.key) |
| 114 | return(-2); |
| 115 | if (elm->key > rec->leaf.base.key) |
| 116 | return(2); |
| 117 | |
| 118 | /* |
| 119 | * Never match against an item deleted by the frontend |
| 120 | * or backend, or committed by the backend. |
| 121 | * |
| 122 | * elm is less then rec if rec is marked deleted. |
| 123 | */ |
| 124 | if (rec->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | |
| 125 | HAMMER_RECF_COMMITTED)) { |
| 126 | return(-1); |
| 127 | } |
| 128 | return(0); |
| 129 | } |
| 130 | |
| 131 | /* |
| 132 | * Ranged scan to locate overlapping record(s). This is used by |
| 133 | * hammer_ip_get_bulk() to locate an overlapping record. We have |
| 134 | * to use a ranged scan because the keys for data records with the |
| 135 | * same file base offset can be different due to differing data_len's. |
| 136 | * |
| 137 | * NOTE: The base file offset of a data record is (key - data_len), not (key). |
| 138 | */ |
| 139 | static int |
| 140 | hammer_rec_overlap_cmp(hammer_record_t rec, void *data) |
| 141 | { |
| 142 | struct hammer_bulk_info *info = data; |
| 143 | hammer_btree_leaf_elm_t leaf = &info->record->leaf; |
| 144 | |
| 145 | if (rec->leaf.base.rec_type < leaf->base.rec_type) |
| 146 | return(-3); |
| 147 | if (rec->leaf.base.rec_type > leaf->base.rec_type) |
| 148 | return(3); |
| 149 | |
| 150 | /* |
| 151 | * Overlap compare |
| 152 | */ |
| 153 | if (leaf->base.rec_type == HAMMER_RECTYPE_DATA) { |
| 154 | /* rec_beg >= leaf_end */ |
| 155 | if (rec->leaf.base.key - rec->leaf.data_len >= leaf->base.key) |
| 156 | return(2); |
| 157 | /* rec_end <= leaf_beg */ |
| 158 | if (rec->leaf.base.key <= leaf->base.key - leaf->data_len) |
| 159 | return(-2); |
| 160 | } else { |
| 161 | if (rec->leaf.base.key < leaf->base.key) |
| 162 | return(-2); |
| 163 | if (rec->leaf.base.key > leaf->base.key) |
| 164 | return(2); |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * We have to return 0 at this point, even if DELETED_FE is set, |
| 169 | * because returning anything else will cause the scan to ignore |
| 170 | * one of the branches when we really want it to check both. |
| 171 | */ |
| 172 | return(0); |
| 173 | } |
| 174 | |
| 175 | /* |
| 176 | * RB_SCAN comparison code for hammer_mem_first(). The argument order |
| 177 | * is reversed so the comparison result has to be negated. key_beg and |
| 178 | * key_end are both range-inclusive. |
| 179 | * |
| 180 | * Localized deletions are not cached in-memory. |
| 181 | */ |
| 182 | static |
| 183 | int |
| 184 | hammer_rec_scan_cmp(hammer_record_t rec, void *data) |
| 185 | { |
| 186 | hammer_cursor_t cursor = data; |
| 187 | int r; |
| 188 | |
| 189 | r = hammer_rec_cmp(&cursor->key_beg, rec); |
| 190 | if (r > 1) |
| 191 | return(-1); |
| 192 | r = hammer_rec_cmp(&cursor->key_end, rec); |
| 193 | if (r < -1) |
| 194 | return(1); |
| 195 | return(0); |
| 196 | } |
| 197 | |
| 198 | /* |
| 199 | * This compare function is used when simply looking up key_beg. |
| 200 | */ |
| 201 | static |
| 202 | int |
| 203 | hammer_rec_find_cmp(hammer_record_t rec, void *data) |
| 204 | { |
| 205 | hammer_cursor_t cursor = data; |
| 206 | int r; |
| 207 | |
| 208 | r = hammer_rec_cmp(&cursor->key_beg, rec); |
| 209 | if (r > 1) |
| 210 | return(-1); |
| 211 | if (r < -1) |
| 212 | return(1); |
| 213 | return(0); |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Locate blocks within the truncation range. Partial blocks do not count. |
| 218 | */ |
| 219 | static |
| 220 | int |
| 221 | hammer_rec_trunc_cmp(hammer_record_t rec, void *data) |
| 222 | { |
| 223 | struct rec_trunc_info *info = data; |
| 224 | |
| 225 | if (rec->leaf.base.rec_type < info->rec_type) |
| 226 | return(-1); |
| 227 | if (rec->leaf.base.rec_type > info->rec_type) |
| 228 | return(1); |
| 229 | |
| 230 | switch(rec->leaf.base.rec_type) { |
| 231 | case HAMMER_RECTYPE_DB: |
| 232 | /* |
| 233 | * DB record key is not beyond the truncation point, retain. |
| 234 | */ |
| 235 | if (rec->leaf.base.key < info->trunc_off) |
| 236 | return(-1); |
| 237 | break; |
| 238 | case HAMMER_RECTYPE_DATA: |
| 239 | /* |
| 240 | * DATA record offset start is not beyond the truncation point, |
| 241 | * retain. |
| 242 | */ |
| 243 | if (rec->leaf.base.key - rec->leaf.data_len < info->trunc_off) |
| 244 | return(-1); |
| 245 | break; |
| 246 | default: |
| 247 | panic("hammer_rec_trunc_cmp: unexpected record type"); |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * The record start is >= the truncation point, return match, |
| 252 | * the record should be destroyed. |
| 253 | */ |
| 254 | return(0); |
| 255 | } |
| 256 | |
| 257 | RB_GENERATE(hammer_rec_rb_tree, hammer_record, rb_node, hammer_rec_rb_compare); |
| 258 | |
| 259 | /* |
| 260 | * Allocate a record for the caller to finish filling in. The record is |
| 261 | * returned referenced. |
| 262 | */ |
| 263 | hammer_record_t |
| 264 | hammer_alloc_mem_record(hammer_inode_t ip, int data_len) |
| 265 | { |
| 266 | hammer_record_t record; |
| 267 | hammer_mount_t hmp; |
| 268 | |
| 269 | hmp = ip->hmp; |
| 270 | ++hammer_count_records; |
| 271 | record = kmalloc(sizeof(*record), hmp->m_misc, |
| 272 | M_WAITOK | M_ZERO | M_USE_RESERVE); |
| 273 | record->flush_state = HAMMER_FST_IDLE; |
| 274 | record->ip = ip; |
| 275 | record->leaf.base.btype = HAMMER_BTREE_TYPE_RECORD; |
| 276 | record->leaf.data_len = data_len; |
| 277 | hammer_ref(&record->lock); |
| 278 | |
| 279 | if (data_len) { |
| 280 | record->data = kmalloc(data_len, hmp->m_misc, M_WAITOK | M_ZERO); |
| 281 | record->flags |= HAMMER_RECF_ALLOCDATA; |
| 282 | ++hammer_count_record_datas; |
| 283 | } |
| 284 | |
| 285 | return (record); |
| 286 | } |
| 287 | |
| 288 | void |
| 289 | hammer_wait_mem_record_ident(hammer_record_t record, const char *ident) |
| 290 | { |
| 291 | while (record->flush_state == HAMMER_FST_FLUSH) { |
| 292 | record->flags |= HAMMER_RECF_WANTED; |
| 293 | tsleep(record, 0, ident, 0); |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | /* |
| 298 | * Called from the backend, hammer_inode.c, after a record has been |
| 299 | * flushed to disk. The record has been exclusively locked by the |
| 300 | * caller and interlocked with BE. |
| 301 | * |
| 302 | * We clean up the state, unlock, and release the record (the record |
| 303 | * was referenced by the fact that it was in the HAMMER_FST_FLUSH state). |
| 304 | */ |
| 305 | void |
| 306 | hammer_flush_record_done(hammer_record_t record, int error) |
| 307 | { |
| 308 | hammer_inode_t target_ip; |
| 309 | |
| 310 | KKASSERT(record->flush_state == HAMMER_FST_FLUSH); |
| 311 | KKASSERT(record->flags & HAMMER_RECF_INTERLOCK_BE); |
| 312 | |
| 313 | /* |
| 314 | * If an error occured, the backend was unable to sync the |
| 315 | * record to its media. Leave the record intact. |
| 316 | */ |
| 317 | if (error) { |
| 318 | hammer_critical_error(record->ip->hmp, record->ip, error, |
| 319 | "while flushing record"); |
| 320 | } |
| 321 | |
| 322 | --record->flush_group->refs; |
| 323 | record->flush_group = NULL; |
| 324 | |
| 325 | /* |
| 326 | * Adjust the flush state and dependancy based on success or |
| 327 | * failure. |
| 328 | */ |
| 329 | if (record->flags & (HAMMER_RECF_DELETED_BE | HAMMER_RECF_COMMITTED)) { |
| 330 | if ((target_ip = record->target_ip) != NULL) { |
| 331 | TAILQ_REMOVE(&target_ip->target_list, record, |
| 332 | target_entry); |
| 333 | record->target_ip = NULL; |
| 334 | hammer_test_inode(target_ip); |
| 335 | } |
| 336 | record->flush_state = HAMMER_FST_IDLE; |
| 337 | } else { |
| 338 | if (record->target_ip) { |
| 339 | record->flush_state = HAMMER_FST_SETUP; |
| 340 | hammer_test_inode(record->ip); |
| 341 | hammer_test_inode(record->target_ip); |
| 342 | } else { |
| 343 | record->flush_state = HAMMER_FST_IDLE; |
| 344 | } |
| 345 | } |
| 346 | record->flags &= ~HAMMER_RECF_INTERLOCK_BE; |
| 347 | |
| 348 | /* |
| 349 | * Cleanup |
| 350 | */ |
| 351 | if (record->flags & HAMMER_RECF_WANTED) { |
| 352 | record->flags &= ~HAMMER_RECF_WANTED; |
| 353 | wakeup(record); |
| 354 | } |
| 355 | hammer_rel_mem_record(record); |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * Release a memory record. Records marked for deletion are immediately |
| 360 | * removed from the RB-Tree but otherwise left intact until the last ref |
| 361 | * goes away. |
| 362 | */ |
| 363 | void |
| 364 | hammer_rel_mem_record(struct hammer_record *record) |
| 365 | { |
| 366 | hammer_mount_t hmp; |
| 367 | hammer_reserve_t resv; |
| 368 | hammer_inode_t ip; |
| 369 | hammer_inode_t target_ip; |
| 370 | int diddrop; |
| 371 | |
| 372 | hammer_rel(&record->lock); |
| 373 | |
| 374 | if (hammer_norefs(&record->lock)) { |
| 375 | /* |
| 376 | * Upon release of the last reference wakeup any waiters. |
| 377 | * The record structure may get destroyed so callers will |
| 378 | * loop up and do a relookup. |
| 379 | * |
| 380 | * WARNING! Record must be removed from RB-TREE before we |
| 381 | * might possibly block. hammer_test_inode() can block! |
| 382 | */ |
| 383 | ip = record->ip; |
| 384 | hmp = ip->hmp; |
| 385 | |
| 386 | /* |
| 387 | * Upon release of the last reference a record marked deleted |
| 388 | * by the front or backend, or committed by the backend, |
| 389 | * is destroyed. |
| 390 | */ |
| 391 | if (record->flags & (HAMMER_RECF_DELETED_FE | |
| 392 | HAMMER_RECF_DELETED_BE | |
| 393 | HAMMER_RECF_COMMITTED)) { |
| 394 | KKASSERT(hammer_isactive(&ip->lock) > 0); |
| 395 | KKASSERT(record->flush_state != HAMMER_FST_FLUSH); |
| 396 | |
| 397 | /* |
| 398 | * target_ip may have zero refs, we have to ref it |
| 399 | * to prevent it from being ripped out from under |
| 400 | * us. |
| 401 | */ |
| 402 | if ((target_ip = record->target_ip) != NULL) { |
| 403 | TAILQ_REMOVE(&target_ip->target_list, |
| 404 | record, target_entry); |
| 405 | record->target_ip = NULL; |
| 406 | hammer_ref(&target_ip->lock); |
| 407 | } |
| 408 | |
| 409 | /* |
| 410 | * Remove the record from the B-Tree |
| 411 | */ |
| 412 | if (record->flags & HAMMER_RECF_ONRBTREE) { |
| 413 | RB_REMOVE(hammer_rec_rb_tree, |
| 414 | &record->ip->rec_tree, |
| 415 | record); |
| 416 | record->flags &= ~HAMMER_RECF_ONRBTREE; |
| 417 | KKASSERT(ip->rsv_recs > 0); |
| 418 | if (RB_EMPTY(&record->ip->rec_tree)) { |
| 419 | record->ip->flags &= |
| 420 | ~HAMMER_INODE_XDIRTY; |
| 421 | record->ip->sync_flags &= |
| 422 | ~HAMMER_INODE_XDIRTY; |
| 423 | } |
| 424 | diddrop = 1; |
| 425 | } else { |
| 426 | diddrop = 0; |
| 427 | } |
| 428 | |
| 429 | /* |
| 430 | * We must wait for any direct-IO to complete before |
| 431 | * we can destroy the record because the bio may |
| 432 | * have a reference to it. |
| 433 | */ |
| 434 | if (record->gflags & |
| 435 | (HAMMER_RECG_DIRECT_IO | HAMMER_RECG_DIRECT_INVAL)) { |
| 436 | hammer_io_direct_wait(record); |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * Account for the completion after the direct IO |
| 441 | * has completed. |
| 442 | */ |
| 443 | if (diddrop) { |
| 444 | --hmp->rsv_recs; |
| 445 | --ip->rsv_recs; |
| 446 | hmp->rsv_databytes -= record->leaf.data_len; |
| 447 | |
| 448 | if (RB_EMPTY(&record->ip->rec_tree)) |
| 449 | hammer_test_inode(record->ip); |
| 450 | if ((ip->flags & HAMMER_INODE_RECSW) && |
| 451 | ip->rsv_recs <= hammer_limit_inode_recs/2) { |
| 452 | ip->flags &= ~HAMMER_INODE_RECSW; |
| 453 | wakeup(&ip->rsv_recs); |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | /* |
| 458 | * Do this test after removing record from the B-Tree. |
| 459 | */ |
| 460 | if (target_ip) { |
| 461 | hammer_test_inode(target_ip); |
| 462 | hammer_rel_inode(target_ip, 0); |
| 463 | } |
| 464 | |
| 465 | if (record->flags & HAMMER_RECF_ALLOCDATA) { |
| 466 | --hammer_count_record_datas; |
| 467 | kfree(record->data, hmp->m_misc); |
| 468 | record->flags &= ~HAMMER_RECF_ALLOCDATA; |
| 469 | } |
| 470 | |
| 471 | /* |
| 472 | * Release the reservation. |
| 473 | * |
| 474 | * If the record was not committed we can theoretically |
| 475 | * undo the reservation. However, doing so might |
| 476 | * create weird edge cases with the ordering of |
| 477 | * direct writes because the related buffer cache |
| 478 | * elements are per-vnode. So we don't try. |
| 479 | */ |
| 480 | if ((resv = record->resv) != NULL) { |
| 481 | /* XXX undo leaf.data_offset,leaf.data_len */ |
| 482 | hammer_blockmap_reserve_complete(hmp, resv); |
| 483 | record->resv = NULL; |
| 484 | } |
| 485 | record->data = NULL; |
| 486 | --hammer_count_records; |
| 487 | kfree(record, hmp->m_misc); |
| 488 | } |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * Record visibility depends on whether the record is being accessed by |
| 494 | * the backend or the frontend. Backend tests ignore the frontend delete |
| 495 | * flag. Frontend tests do NOT ignore the backend delete/commit flags and |
| 496 | * must also check for commit races. |
| 497 | * |
| 498 | * Return non-zero if the record is visible, zero if it isn't or if it is |
| 499 | * deleted. Returns 0 if the record has been comitted (unless the special |
| 500 | * delete-visibility flag is set). A committed record must be located |
| 501 | * via the media B-Tree. Returns non-zero if the record is good. |
| 502 | * |
| 503 | * If HAMMER_CURSOR_DELETE_VISIBILITY is set we allow deleted memory |
| 504 | * records to be returned. This is so pending deletions are detected |
| 505 | * when using an iterator to locate an unused hash key, or when we need |
| 506 | * to locate historical records on-disk to destroy. |
| 507 | */ |
| 508 | static __inline |
| 509 | int |
| 510 | hammer_ip_iterate_mem_good(hammer_cursor_t cursor, hammer_record_t record) |
| 511 | { |
| 512 | if (cursor->flags & HAMMER_CURSOR_DELETE_VISIBILITY) |
| 513 | return(1); |
| 514 | if (cursor->flags & HAMMER_CURSOR_BACKEND) { |
| 515 | if (record->flags & (HAMMER_RECF_DELETED_BE | |
| 516 | HAMMER_RECF_COMMITTED)) { |
| 517 | return(0); |
| 518 | } |
| 519 | } else { |
| 520 | if (record->flags & (HAMMER_RECF_DELETED_FE | |
| 521 | HAMMER_RECF_DELETED_BE | |
| 522 | HAMMER_RECF_COMMITTED)) { |
| 523 | return(0); |
| 524 | } |
| 525 | } |
| 526 | return(1); |
| 527 | } |
| 528 | |
| 529 | /* |
| 530 | * This callback is used as part of the RB_SCAN function for in-memory |
| 531 | * records. We terminate it (return -1) as soon as we get a match. |
| 532 | * |
| 533 | * This routine is used by frontend code. |
| 534 | * |
| 535 | * The primary compare code does not account for ASOF lookups. This |
| 536 | * code handles that case as well as a few others. |
| 537 | */ |
| 538 | static |
| 539 | int |
| 540 | hammer_rec_scan_callback(hammer_record_t rec, void *data) |
| 541 | { |
| 542 | hammer_cursor_t cursor = data; |
| 543 | |
| 544 | /* |
| 545 | * We terminate on success, so this should be NULL on entry. |
| 546 | */ |
| 547 | KKASSERT(cursor->iprec == NULL); |
| 548 | |
| 549 | /* |
| 550 | * Skip if the record was marked deleted or committed. |
| 551 | */ |
| 552 | if (hammer_ip_iterate_mem_good(cursor, rec) == 0) |
| 553 | return(0); |
| 554 | |
| 555 | /* |
| 556 | * Skip if not visible due to our as-of TID |
| 557 | */ |
| 558 | if (cursor->flags & HAMMER_CURSOR_ASOF) { |
| 559 | if (cursor->asof < rec->leaf.base.create_tid) |
| 560 | return(0); |
| 561 | if (rec->leaf.base.delete_tid && |
| 562 | cursor->asof >= rec->leaf.base.delete_tid) { |
| 563 | return(0); |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * ref the record. The record is protected from backend B-Tree |
| 569 | * interactions by virtue of the cursor's IP lock. |
| 570 | */ |
| 571 | hammer_ref(&rec->lock); |
| 572 | |
| 573 | /* |
| 574 | * The record may have been deleted or committed while we |
| 575 | * were blocked. XXX remove? |
| 576 | */ |
| 577 | if (hammer_ip_iterate_mem_good(cursor, rec) == 0) { |
| 578 | hammer_rel_mem_record(rec); |
| 579 | return(0); |
| 580 | } |
| 581 | |
| 582 | /* |
| 583 | * Set the matching record and stop the scan. |
| 584 | */ |
| 585 | cursor->iprec = rec; |
| 586 | return(-1); |
| 587 | } |
| 588 | |
| 589 | |
| 590 | /* |
| 591 | * Lookup an in-memory record given the key specified in the cursor. Works |
| 592 | * just like hammer_btree_lookup() but operates on an inode's in-memory |
| 593 | * record list. |
| 594 | * |
| 595 | * The lookup must fail if the record is marked for deferred deletion. |
| 596 | * |
| 597 | * The API for mem/btree_lookup() does not mess with the ATE/EOF bits. |
| 598 | */ |
| 599 | static |
| 600 | int |
| 601 | hammer_mem_lookup(hammer_cursor_t cursor) |
| 602 | { |
| 603 | KKASSERT(cursor->ip); |
| 604 | if (cursor->iprec) { |
| 605 | hammer_rel_mem_record(cursor->iprec); |
| 606 | cursor->iprec = NULL; |
| 607 | } |
| 608 | hammer_rec_rb_tree_RB_SCAN(&cursor->ip->rec_tree, hammer_rec_find_cmp, |
| 609 | hammer_rec_scan_callback, cursor); |
| 610 | |
| 611 | return (cursor->iprec ? 0 : ENOENT); |
| 612 | } |
| 613 | |
| 614 | /* |
| 615 | * hammer_mem_first() - locate the first in-memory record matching the |
| 616 | * cursor within the bounds of the key range. |
| 617 | * |
| 618 | * WARNING! API is slightly different from btree_first(). hammer_mem_first() |
| 619 | * will set ATEMEM the same as MEMEOF, and does not return any error. |
| 620 | */ |
| 621 | static |
| 622 | void |
| 623 | hammer_mem_first(hammer_cursor_t cursor) |
| 624 | { |
| 625 | hammer_inode_t ip; |
| 626 | |
| 627 | ip = cursor->ip; |
| 628 | KKASSERT(ip != NULL); |
| 629 | |
| 630 | if (cursor->iprec) { |
| 631 | hammer_rel_mem_record(cursor->iprec); |
| 632 | cursor->iprec = NULL; |
| 633 | } |
| 634 | hammer_rec_rb_tree_RB_SCAN(&ip->rec_tree, hammer_rec_scan_cmp, |
| 635 | hammer_rec_scan_callback, cursor); |
| 636 | |
| 637 | if (cursor->iprec) |
| 638 | cursor->flags &= ~(HAMMER_CURSOR_MEMEOF | HAMMER_CURSOR_ATEMEM); |
| 639 | else |
| 640 | cursor->flags |= HAMMER_CURSOR_MEMEOF | HAMMER_CURSOR_ATEMEM; |
| 641 | } |
| 642 | |
| 643 | /************************************************************************ |
| 644 | * HAMMER IN-MEMORY RECORD FUNCTIONS * |
| 645 | ************************************************************************ |
| 646 | * |
| 647 | * These functions manipulate in-memory records. Such records typically |
| 648 | * exist prior to being committed to disk or indexed via the on-disk B-Tree. |
| 649 | */ |
| 650 | |
| 651 | /* |
| 652 | * Add a directory entry (dip,ncp) which references inode (ip). |
| 653 | * |
| 654 | * Note that the low 32 bits of the namekey are set temporarily to create |
| 655 | * a unique in-memory record, and may be modified a second time when the |
| 656 | * record is synchronized to disk. In particular, the low 32 bits cannot be |
| 657 | * all 0's when synching to disk, which is not handled here. |
| 658 | * |
| 659 | * NOTE: bytes does not include any terminating \0 on name, and name might |
| 660 | * not be terminated. |
| 661 | */ |
| 662 | int |
| 663 | hammer_ip_add_directory(struct hammer_transaction *trans, |
| 664 | struct hammer_inode *dip, const char *name, int bytes, |
| 665 | struct hammer_inode *ip) |
| 666 | { |
| 667 | struct hammer_cursor cursor; |
| 668 | hammer_record_t record; |
| 669 | int error; |
| 670 | u_int32_t max_iterations; |
| 671 | |
| 672 | record = hammer_alloc_mem_record(dip, HAMMER_ENTRY_SIZE(bytes)); |
| 673 | |
| 674 | record->type = HAMMER_MEM_RECORD_ADD; |
| 675 | record->leaf.base.localization = dip->obj_localization + |
| 676 | hammer_dir_localization(dip); |
| 677 | record->leaf.base.obj_id = dip->obj_id; |
| 678 | record->leaf.base.key = hammer_directory_namekey(dip, name, bytes, |
| 679 | &max_iterations); |
| 680 | record->leaf.base.rec_type = HAMMER_RECTYPE_DIRENTRY; |
| 681 | record->leaf.base.obj_type = ip->ino_leaf.base.obj_type; |
| 682 | record->data->entry.obj_id = ip->obj_id; |
| 683 | record->data->entry.localization = ip->obj_localization; |
| 684 | bcopy(name, record->data->entry.name, bytes); |
| 685 | |
| 686 | ++ip->ino_data.nlinks; |
| 687 | ip->ino_data.ctime = trans->time; |
| 688 | hammer_modify_inode(trans, ip, HAMMER_INODE_DDIRTY); |
| 689 | |
| 690 | /* |
| 691 | * Find an unused namekey. Both the in-memory record tree and |
| 692 | * the B-Tree are checked. We do not want historically deleted |
| 693 | * names to create a collision as our iteration space may be limited, |
| 694 | * and since create_tid wouldn't match anyway an ASOF search |
| 695 | * must be used to locate collisions. |
| 696 | * |
| 697 | * delete-visibility is set so pending deletions do not give us |
| 698 | * a false-negative on our ability to use an iterator. |
| 699 | * |
| 700 | * The iterator must not rollover the key. Directory keys only |
| 701 | * use the positive key space. |
| 702 | */ |
| 703 | hammer_init_cursor(trans, &cursor, &dip->cache[1], dip); |
| 704 | cursor.key_beg = record->leaf.base; |
| 705 | cursor.flags |= HAMMER_CURSOR_ASOF; |
| 706 | cursor.flags |= HAMMER_CURSOR_DELETE_VISIBILITY; |
| 707 | cursor.asof = ip->obj_asof; |
| 708 | |
| 709 | while (hammer_ip_lookup(&cursor) == 0) { |
| 710 | ++record->leaf.base.key; |
| 711 | KKASSERT(record->leaf.base.key > 0); |
| 712 | cursor.key_beg.key = record->leaf.base.key; |
| 713 | if (--max_iterations == 0) { |
| 714 | hammer_rel_mem_record(record); |
| 715 | error = ENOSPC; |
| 716 | goto failed; |
| 717 | } |
| 718 | } |
| 719 | |
| 720 | /* |
| 721 | * The target inode and the directory entry are bound together. |
| 722 | */ |
| 723 | record->target_ip = ip; |
| 724 | record->flush_state = HAMMER_FST_SETUP; |
| 725 | TAILQ_INSERT_TAIL(&ip->target_list, record, target_entry); |
| 726 | |
| 727 | /* |
| 728 | * The inode now has a dependancy and must be taken out of the idle |
| 729 | * state. An inode not in an idle state is given an extra reference. |
| 730 | * |
| 731 | * When transitioning to a SETUP state flag for an automatic reflush |
| 732 | * when the dependancies are disposed of if someone is waiting on |
| 733 | * the inode. |
| 734 | */ |
| 735 | if (ip->flush_state == HAMMER_FST_IDLE) { |
| 736 | hammer_ref(&ip->lock); |
| 737 | ip->flush_state = HAMMER_FST_SETUP; |
| 738 | if (ip->flags & HAMMER_INODE_FLUSHW) |
| 739 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 740 | } |
| 741 | error = hammer_mem_add(record); |
| 742 | if (error == 0) { |
| 743 | dip->ino_data.mtime = trans->time; |
| 744 | hammer_modify_inode(trans, dip, HAMMER_INODE_MTIME); |
| 745 | } |
| 746 | failed: |
| 747 | hammer_done_cursor(&cursor); |
| 748 | return(error); |
| 749 | } |
| 750 | |
| 751 | /* |
| 752 | * Delete the directory entry and update the inode link count. The |
| 753 | * cursor must be seeked to the directory entry record being deleted. |
| 754 | * |
| 755 | * The related inode should be share-locked by the caller. The caller is |
| 756 | * on the frontend. It could also be NULL indicating that the directory |
| 757 | * entry being removed has no related inode. |
| 758 | * |
| 759 | * This function can return EDEADLK requiring the caller to terminate |
| 760 | * the cursor, any locks, wait on the returned record, and retry. |
| 761 | */ |
| 762 | int |
| 763 | hammer_ip_del_directory(struct hammer_transaction *trans, |
| 764 | hammer_cursor_t cursor, struct hammer_inode *dip, |
| 765 | struct hammer_inode *ip) |
| 766 | { |
| 767 | hammer_record_t record; |
| 768 | int error; |
| 769 | |
| 770 | if (hammer_cursor_inmem(cursor)) { |
| 771 | /* |
| 772 | * In-memory (unsynchronized) records can simply be freed. |
| 773 | * |
| 774 | * Even though the HAMMER_RECF_DELETED_FE flag is ignored |
| 775 | * by the backend, we must still avoid races against the |
| 776 | * backend potentially syncing the record to the media. |
| 777 | * |
| 778 | * We cannot call hammer_ip_delete_record(), that routine may |
| 779 | * only be called from the backend. |
| 780 | */ |
| 781 | record = cursor->iprec; |
| 782 | if (record->flags & (HAMMER_RECF_INTERLOCK_BE | |
| 783 | HAMMER_RECF_DELETED_BE | |
| 784 | HAMMER_RECF_COMMITTED)) { |
| 785 | KKASSERT(cursor->deadlk_rec == NULL); |
| 786 | hammer_ref(&record->lock); |
| 787 | cursor->deadlk_rec = record; |
| 788 | error = EDEADLK; |
| 789 | } else { |
| 790 | KKASSERT(record->type == HAMMER_MEM_RECORD_ADD); |
| 791 | record->flags |= HAMMER_RECF_DELETED_FE; |
| 792 | error = 0; |
| 793 | } |
| 794 | } else { |
| 795 | /* |
| 796 | * If the record is on-disk we have to queue the deletion by |
| 797 | * the record's key. This also causes lookups to skip the |
| 798 | * record (lookups for the purposes of finding an unused |
| 799 | * directory key do not skip the record). |
| 800 | */ |
| 801 | KKASSERT(dip->flags & |
| 802 | (HAMMER_INODE_ONDISK | HAMMER_INODE_DONDISK)); |
| 803 | record = hammer_alloc_mem_record(dip, 0); |
| 804 | record->type = HAMMER_MEM_RECORD_DEL; |
| 805 | record->leaf.base = cursor->leaf->base; |
| 806 | KKASSERT(dip->obj_id == record->leaf.base.obj_id); |
| 807 | |
| 808 | /* |
| 809 | * ip may be NULL, indicating the deletion of a directory |
| 810 | * entry which has no related inode. |
| 811 | */ |
| 812 | record->target_ip = ip; |
| 813 | if (ip) { |
| 814 | record->flush_state = HAMMER_FST_SETUP; |
| 815 | TAILQ_INSERT_TAIL(&ip->target_list, record, |
| 816 | target_entry); |
| 817 | } else { |
| 818 | record->flush_state = HAMMER_FST_IDLE; |
| 819 | } |
| 820 | |
| 821 | /* |
| 822 | * The inode now has a dependancy and must be taken out of |
| 823 | * the idle state. An inode not in an idle state is given |
| 824 | * an extra reference. |
| 825 | * |
| 826 | * When transitioning to a SETUP state flag for an automatic |
| 827 | * reflush when the dependancies are disposed of if someone |
| 828 | * is waiting on the inode. |
| 829 | */ |
| 830 | if (ip && ip->flush_state == HAMMER_FST_IDLE) { |
| 831 | hammer_ref(&ip->lock); |
| 832 | ip->flush_state = HAMMER_FST_SETUP; |
| 833 | if (ip->flags & HAMMER_INODE_FLUSHW) |
| 834 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 835 | } |
| 836 | |
| 837 | error = hammer_mem_add(record); |
| 838 | } |
| 839 | |
| 840 | /* |
| 841 | * One less link. The file may still be open in the OS even after |
| 842 | * all links have gone away. |
| 843 | * |
| 844 | * We have to terminate the cursor before syncing the inode to |
| 845 | * avoid deadlocking against ourselves. XXX this may no longer |
| 846 | * be true. |
| 847 | * |
| 848 | * If nlinks drops to zero and the vnode is inactive (or there is |
| 849 | * no vnode), call hammer_inode_unloadable_check() to zonk the |
| 850 | * inode. If we don't do this here the inode will not be destroyed |
| 851 | * on-media until we unmount. |
| 852 | */ |
| 853 | if (error == 0) { |
| 854 | if (ip) { |
| 855 | --ip->ino_data.nlinks; /* do before we might block */ |
| 856 | ip->ino_data.ctime = trans->time; |
| 857 | } |
| 858 | dip->ino_data.mtime = trans->time; |
| 859 | hammer_modify_inode(trans, dip, HAMMER_INODE_MTIME); |
| 860 | if (ip) { |
| 861 | hammer_modify_inode(trans, ip, HAMMER_INODE_DDIRTY); |
| 862 | if (ip->ino_data.nlinks == 0 && |
| 863 | (ip->vp == NULL || (ip->vp->v_flag & VINACTIVE))) { |
| 864 | hammer_done_cursor(cursor); |
| 865 | hammer_inode_unloadable_check(ip, 1); |
| 866 | hammer_flush_inode(ip, 0); |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | } |
| 871 | return(error); |
| 872 | } |
| 873 | |
| 874 | /* |
| 875 | * Add a record to an inode. |
| 876 | * |
| 877 | * The caller must allocate the record with hammer_alloc_mem_record(ip) and |
| 878 | * initialize the following additional fields: |
| 879 | * |
| 880 | * The related inode should be share-locked by the caller. The caller is |
| 881 | * on the frontend. |
| 882 | * |
| 883 | * record->rec.entry.base.base.key |
| 884 | * record->rec.entry.base.base.rec_type |
| 885 | * record->rec.entry.base.base.data_len |
| 886 | * record->data (a copy will be kmalloc'd if it cannot be embedded) |
| 887 | */ |
| 888 | int |
| 889 | hammer_ip_add_record(struct hammer_transaction *trans, hammer_record_t record) |
| 890 | { |
| 891 | hammer_inode_t ip = record->ip; |
| 892 | int error; |
| 893 | |
| 894 | KKASSERT(record->leaf.base.localization != 0); |
| 895 | record->leaf.base.obj_id = ip->obj_id; |
| 896 | record->leaf.base.obj_type = ip->ino_leaf.base.obj_type; |
| 897 | error = hammer_mem_add(record); |
| 898 | return(error); |
| 899 | } |
| 900 | |
| 901 | /* |
| 902 | * Locate a pre-existing bulk record in memory. The caller wishes to |
| 903 | * replace the record with a new one. The existing record may have a |
| 904 | * different length (and thus a different key) so we have to use an |
| 905 | * overlap check function. |
| 906 | */ |
| 907 | static hammer_record_t |
| 908 | hammer_ip_get_bulk(hammer_record_t record) |
| 909 | { |
| 910 | struct hammer_bulk_info info; |
| 911 | hammer_inode_t ip = record->ip; |
| 912 | |
| 913 | info.record = record; |
| 914 | info.conflict = NULL; |
| 915 | hammer_rec_rb_tree_RB_SCAN(&ip->rec_tree, hammer_rec_overlap_cmp, |
| 916 | hammer_bulk_scan_callback, &info); |
| 917 | |
| 918 | return(info.conflict); /* may be NULL */ |
| 919 | } |
| 920 | |
| 921 | /* |
| 922 | * Take records vetted by overlap_cmp. The first non-deleted record |
| 923 | * (if any) stops the scan. |
| 924 | */ |
| 925 | static int |
| 926 | hammer_bulk_scan_callback(hammer_record_t record, void *data) |
| 927 | { |
| 928 | struct hammer_bulk_info *info = data; |
| 929 | |
| 930 | if (record->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | |
| 931 | HAMMER_RECF_COMMITTED)) { |
| 932 | return(0); |
| 933 | } |
| 934 | hammer_ref(&record->lock); |
| 935 | info->conflict = record; |
| 936 | return(-1); /* stop scan */ |
| 937 | } |
| 938 | |
| 939 | /* |
| 940 | * Reserve blockmap space placemarked with an in-memory record. |
| 941 | * |
| 942 | * This routine is called by the frontend in order to be able to directly |
| 943 | * flush a buffer cache buffer. The frontend has locked the related buffer |
| 944 | * cache buffers and we should be able to manipulate any overlapping |
| 945 | * in-memory records. |
| 946 | * |
| 947 | * The caller is responsible for adding the returned record and deleting |
| 948 | * the returned conflicting record (if any), typically by calling |
| 949 | * hammer_ip_replace_bulk() (via hammer_io_direct_write()). |
| 950 | */ |
| 951 | hammer_record_t |
| 952 | hammer_ip_add_bulk(hammer_inode_t ip, off_t file_offset, void *data, int bytes, |
| 953 | int *errorp) |
| 954 | { |
| 955 | hammer_record_t record; |
| 956 | hammer_dedup_cache_t dcp; |
| 957 | hammer_crc_t crc; |
| 958 | int zone; |
| 959 | |
| 960 | /* |
| 961 | * Create a record to cover the direct write. The record cannot |
| 962 | * be added to the in-memory RB tree here as it might conflict |
| 963 | * with an existing memory record. See hammer_io_direct_write(). |
| 964 | * |
| 965 | * The backend is responsible for finalizing the space reserved in |
| 966 | * this record. |
| 967 | * |
| 968 | * XXX bytes not aligned, depend on the reservation code to |
| 969 | * align the reservation. |
| 970 | */ |
| 971 | record = hammer_alloc_mem_record(ip, 0); |
| 972 | zone = (bytes >= HAMMER_BUFSIZE) ? HAMMER_ZONE_LARGE_DATA_INDEX : |
| 973 | HAMMER_ZONE_SMALL_DATA_INDEX; |
| 974 | if (bytes == 0) |
| 975 | crc = 0; |
| 976 | else |
| 977 | crc = crc32(data, bytes); |
| 978 | |
| 979 | if (hammer_live_dedup == 0) |
| 980 | goto nodedup; |
| 981 | if ((dcp = hammer_dedup_cache_lookup(ip->hmp, crc)) != NULL) { |
| 982 | struct hammer_dedup_cache tmp = *dcp; |
| 983 | |
| 984 | record->resv = hammer_blockmap_reserve_dedup(ip->hmp, zone, |
| 985 | bytes, tmp.data_offset, errorp); |
| 986 | if (record->resv == NULL) |
| 987 | goto nodedup; |
| 988 | |
| 989 | if (!hammer_dedup_validate(&tmp, zone, bytes, data)) { |
| 990 | hammer_blockmap_reserve_complete(ip->hmp, record->resv); |
| 991 | goto nodedup; |
| 992 | } |
| 993 | |
| 994 | record->leaf.data_offset = tmp.data_offset; |
| 995 | record->flags |= HAMMER_RECF_DEDUPED; |
| 996 | } else { |
| 997 | nodedup: |
| 998 | record->resv = hammer_blockmap_reserve(ip->hmp, zone, bytes, |
| 999 | &record->leaf.data_offset, errorp); |
| 1000 | if (record->resv == NULL) { |
| 1001 | kprintf("hammer_ip_add_bulk: reservation failed\n"); |
| 1002 | hammer_rel_mem_record(record); |
| 1003 | return(NULL); |
| 1004 | } |
| 1005 | } |
| 1006 | |
| 1007 | record->type = HAMMER_MEM_RECORD_DATA; |
| 1008 | record->leaf.base.rec_type = HAMMER_RECTYPE_DATA; |
| 1009 | record->leaf.base.obj_type = ip->ino_leaf.base.obj_type; |
| 1010 | record->leaf.base.obj_id = ip->obj_id; |
| 1011 | record->leaf.base.key = file_offset + bytes; |
| 1012 | record->leaf.base.localization = ip->obj_localization + |
| 1013 | HAMMER_LOCALIZE_MISC; |
| 1014 | record->leaf.data_len = bytes; |
| 1015 | record->leaf.data_crc = crc; |
| 1016 | KKASSERT(*errorp == 0); |
| 1017 | |
| 1018 | return(record); |
| 1019 | } |
| 1020 | |
| 1021 | /* |
| 1022 | * Called by hammer_io_direct_write() prior to any possible completion |
| 1023 | * of the BIO to emplace the memory record associated with the I/O and |
| 1024 | * to replace any prior memory record which might still be active. |
| 1025 | * |
| 1026 | * Setting the FE deleted flag on the old record (if any) avoids any RB |
| 1027 | * tree insertion conflict, amoung other things. |
| 1028 | * |
| 1029 | * This has to be done prior to the caller completing any related buffer |
| 1030 | * cache I/O or a reinstantiation of the buffer may load data from the |
| 1031 | * old media location instead of the new media location. The holding |
| 1032 | * of the locked buffer cache buffer serves to interlock the record |
| 1033 | * replacement operation. |
| 1034 | */ |
| 1035 | void |
| 1036 | hammer_ip_replace_bulk(hammer_mount_t hmp, hammer_record_t record) |
| 1037 | { |
| 1038 | hammer_record_t conflict; |
| 1039 | int error; |
| 1040 | |
| 1041 | while ((conflict = hammer_ip_get_bulk(record)) != NULL) { |
| 1042 | if ((conflict->flags & HAMMER_RECF_INTERLOCK_BE) == 0) { |
| 1043 | conflict->flags |= HAMMER_RECF_DELETED_FE; |
| 1044 | break; |
| 1045 | } |
| 1046 | conflict->flags |= HAMMER_RECF_WANTED; |
| 1047 | tsleep(conflict, 0, "hmrrc3", 0); |
| 1048 | hammer_rel_mem_record(conflict); |
| 1049 | } |
| 1050 | error = hammer_mem_add(record); |
| 1051 | if (conflict) |
| 1052 | hammer_rel_mem_record(conflict); |
| 1053 | KKASSERT(error == 0); |
| 1054 | } |
| 1055 | |
| 1056 | /* |
| 1057 | * Frontend truncation code. Scan in-memory records only. On-disk records |
| 1058 | * and records in a flushing state are handled by the backend. The vnops |
| 1059 | * setattr code will handle the block containing the truncation point. |
| 1060 | * |
| 1061 | * Partial blocks are not deleted. |
| 1062 | * |
| 1063 | * This code is only called on regular files. |
| 1064 | */ |
| 1065 | int |
| 1066 | hammer_ip_frontend_trunc(struct hammer_inode *ip, off_t file_size) |
| 1067 | { |
| 1068 | struct rec_trunc_info info; |
| 1069 | |
| 1070 | switch(ip->ino_data.obj_type) { |
| 1071 | case HAMMER_OBJTYPE_REGFILE: |
| 1072 | info.rec_type = HAMMER_RECTYPE_DATA; |
| 1073 | break; |
| 1074 | case HAMMER_OBJTYPE_DBFILE: |
| 1075 | info.rec_type = HAMMER_RECTYPE_DB; |
| 1076 | break; |
| 1077 | default: |
| 1078 | return(EINVAL); |
| 1079 | } |
| 1080 | info.trunc_off = file_size; |
| 1081 | hammer_rec_rb_tree_RB_SCAN(&ip->rec_tree, hammer_rec_trunc_cmp, |
| 1082 | hammer_frontend_trunc_callback, &info); |
| 1083 | return(0); |
| 1084 | } |
| 1085 | |
| 1086 | /* |
| 1087 | * Scan callback for frontend records to destroy during a truncation. |
| 1088 | * We must ensure that DELETED_FE is set on the record or the frontend |
| 1089 | * will get confused in future read() calls. |
| 1090 | * |
| 1091 | * NOTE: DELETED_FE cannot be set while the record interlock (BE) is held. |
| 1092 | * In this rare case we must wait for the interlock to be cleared. |
| 1093 | * |
| 1094 | * NOTE: This function is only called on regular files. There are further |
| 1095 | * restrictions to the setting of DELETED_FE on directory records |
| 1096 | * undergoing a flush due to sensitive inode link count calculations. |
| 1097 | */ |
| 1098 | static int |
| 1099 | hammer_frontend_trunc_callback(hammer_record_t record, void *data __unused) |
| 1100 | { |
| 1101 | if (record->flags & HAMMER_RECF_DELETED_FE) |
| 1102 | return(0); |
| 1103 | #if 0 |
| 1104 | if (record->flush_state == HAMMER_FST_FLUSH) |
| 1105 | return(0); |
| 1106 | #endif |
| 1107 | hammer_ref(&record->lock); |
| 1108 | while (record->flags & HAMMER_RECF_INTERLOCK_BE) |
| 1109 | hammer_wait_mem_record_ident(record, "hmmtrr"); |
| 1110 | record->flags |= HAMMER_RECF_DELETED_FE; |
| 1111 | hammer_rel_mem_record(record); |
| 1112 | return(0); |
| 1113 | } |
| 1114 | |
| 1115 | /* |
| 1116 | * Return 1 if the caller must check for and delete existing records |
| 1117 | * before writing out a new data record. |
| 1118 | * |
| 1119 | * Return 0 if the caller can just insert the record into the B-Tree without |
| 1120 | * checking. |
| 1121 | */ |
| 1122 | static int |
| 1123 | hammer_record_needs_overwrite_delete(hammer_record_t record) |
| 1124 | { |
| 1125 | hammer_inode_t ip = record->ip; |
| 1126 | int64_t file_offset; |
| 1127 | int r; |
| 1128 | |
| 1129 | if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) |
| 1130 | file_offset = record->leaf.base.key; |
| 1131 | else |
| 1132 | file_offset = record->leaf.base.key - record->leaf.data_len; |
| 1133 | r = (file_offset < ip->save_trunc_off); |
| 1134 | if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { |
| 1135 | if (ip->save_trunc_off <= record->leaf.base.key) |
| 1136 | ip->save_trunc_off = record->leaf.base.key + 1; |
| 1137 | } else { |
| 1138 | if (ip->save_trunc_off < record->leaf.base.key) |
| 1139 | ip->save_trunc_off = record->leaf.base.key; |
| 1140 | } |
| 1141 | return(r); |
| 1142 | } |
| 1143 | |
| 1144 | /* |
| 1145 | * Backend code. Sync a record to the media. |
| 1146 | */ |
| 1147 | int |
| 1148 | hammer_ip_sync_record_cursor(hammer_cursor_t cursor, hammer_record_t record) |
| 1149 | { |
| 1150 | hammer_transaction_t trans = cursor->trans; |
| 1151 | int64_t file_offset; |
| 1152 | int bytes; |
| 1153 | void *bdata; |
| 1154 | int error; |
| 1155 | int doprop; |
| 1156 | |
| 1157 | KKASSERT(record->flush_state == HAMMER_FST_FLUSH); |
| 1158 | KKASSERT(record->flags & HAMMER_RECF_INTERLOCK_BE); |
| 1159 | KKASSERT(record->leaf.base.localization != 0); |
| 1160 | |
| 1161 | /* |
| 1162 | * Any direct-write related to the record must complete before we |
| 1163 | * can sync the record to the on-disk media. |
| 1164 | */ |
| 1165 | if (record->gflags & (HAMMER_RECG_DIRECT_IO | HAMMER_RECG_DIRECT_INVAL)) |
| 1166 | hammer_io_direct_wait(record); |
| 1167 | |
| 1168 | /* |
| 1169 | * If this is a bulk-data record placemarker there may be an existing |
| 1170 | * record on-disk, indicating a data overwrite. If there is the |
| 1171 | * on-disk record must be deleted before we can insert our new record. |
| 1172 | * |
| 1173 | * We've synthesized this record and do not know what the create_tid |
| 1174 | * on-disk is, nor how much data it represents. |
| 1175 | * |
| 1176 | * Keep in mind that (key) for data records is (base_offset + len), |
| 1177 | * not (base_offset). Also, we only want to get rid of on-disk |
| 1178 | * records since we are trying to sync our in-memory record, call |
| 1179 | * hammer_ip_delete_range() with truncating set to 1 to make sure |
| 1180 | * it skips in-memory records. |
| 1181 | * |
| 1182 | * It is ok for the lookup to return ENOENT. |
| 1183 | * |
| 1184 | * NOTE OPTIMIZATION: sync_trunc_off is used to determine if we have |
| 1185 | * to call hammer_ip_delete_range() or not. This also means we must |
| 1186 | * update sync_trunc_off() as we write. |
| 1187 | */ |
| 1188 | if (record->type == HAMMER_MEM_RECORD_DATA && |
| 1189 | hammer_record_needs_overwrite_delete(record)) { |
| 1190 | file_offset = record->leaf.base.key - record->leaf.data_len; |
| 1191 | bytes = (record->leaf.data_len + HAMMER_BUFMASK) & |
| 1192 | ~HAMMER_BUFMASK; |
| 1193 | KKASSERT((file_offset & HAMMER_BUFMASK) == 0); |
| 1194 | error = hammer_ip_delete_range( |
| 1195 | cursor, record->ip, |
| 1196 | file_offset, file_offset + bytes - 1, |
| 1197 | 1); |
| 1198 | if (error && error != ENOENT) |
| 1199 | goto done; |
| 1200 | } |
| 1201 | |
| 1202 | /* |
| 1203 | * If this is a general record there may be an on-disk version |
| 1204 | * that must be deleted before we can insert the new record. |
| 1205 | */ |
| 1206 | if (record->type == HAMMER_MEM_RECORD_GENERAL) { |
| 1207 | error = hammer_delete_general(cursor, record->ip, |
| 1208 | &record->leaf); |
| 1209 | if (error && error != ENOENT) |
| 1210 | goto done; |
| 1211 | } |
| 1212 | |
| 1213 | /* |
| 1214 | * Setup the cursor. |
| 1215 | */ |
| 1216 | hammer_normalize_cursor(cursor); |
| 1217 | cursor->key_beg = record->leaf.base; |
| 1218 | cursor->flags &= ~HAMMER_CURSOR_INITMASK; |
| 1219 | cursor->flags |= HAMMER_CURSOR_BACKEND; |
| 1220 | cursor->flags &= ~HAMMER_CURSOR_INSERT; |
| 1221 | |
| 1222 | /* |
| 1223 | * Records can wind up on-media before the inode itself is on-media. |
| 1224 | * Flag the case. |
| 1225 | */ |
| 1226 | record->ip->flags |= HAMMER_INODE_DONDISK; |
| 1227 | |
| 1228 | /* |
| 1229 | * If we are deleting a directory entry an exact match must be |
| 1230 | * found on-disk. |
| 1231 | */ |
| 1232 | if (record->type == HAMMER_MEM_RECORD_DEL) { |
| 1233 | error = hammer_btree_lookup(cursor); |
| 1234 | if (error == 0) { |
| 1235 | KKASSERT(cursor->iprec == NULL); |
| 1236 | error = hammer_ip_delete_record(cursor, record->ip, |
| 1237 | trans->tid); |
| 1238 | if (error == 0) { |
| 1239 | record->flags |= HAMMER_RECF_DELETED_BE | |
| 1240 | HAMMER_RECF_COMMITTED; |
| 1241 | ++record->ip->rec_generation; |
| 1242 | } |
| 1243 | } |
| 1244 | goto done; |
| 1245 | } |
| 1246 | |
| 1247 | /* |
| 1248 | * We are inserting. |
| 1249 | * |
| 1250 | * Issue a lookup to position the cursor and locate the insertion |
| 1251 | * point. The target key should not exist. If we are creating a |
| 1252 | * directory entry we may have to iterate the low 32 bits of the |
| 1253 | * key to find an unused key. |
| 1254 | */ |
| 1255 | hammer_sync_lock_sh(trans); |
| 1256 | cursor->flags |= HAMMER_CURSOR_INSERT; |
| 1257 | error = hammer_btree_lookup(cursor); |
| 1258 | if (hammer_debug_inode) |
| 1259 | kprintf("DOINSERT LOOKUP %d\n", error); |
| 1260 | if (error == 0) { |
| 1261 | kprintf("hammer_ip_sync_record: duplicate rec " |
| 1262 | "at (%016llx)\n", (long long)record->leaf.base.key); |
| 1263 | if (hammer_debug_critical) |
| 1264 | Debugger("duplicate record1"); |
| 1265 | error = EIO; |
| 1266 | } |
| 1267 | #if 0 |
| 1268 | if (record->type == HAMMER_MEM_RECORD_DATA) |
| 1269 | kprintf("sync_record %016llx ---------------- %016llx %d\n", |
| 1270 | record->leaf.base.key - record->leaf.data_len, |
| 1271 | record->leaf.data_offset, error); |
| 1272 | #endif |
| 1273 | |
| 1274 | if (error != ENOENT) |
| 1275 | goto done_unlock; |
| 1276 | |
| 1277 | /* |
| 1278 | * Allocate the record and data. The result buffers will be |
| 1279 | * marked as being modified and further calls to |
| 1280 | * hammer_modify_buffer() will result in unneeded UNDO records. |
| 1281 | * |
| 1282 | * Support zero-fill records (data == NULL and data_len != 0) |
| 1283 | */ |
| 1284 | if (record->type == HAMMER_MEM_RECORD_DATA) { |
| 1285 | /* |
| 1286 | * The data portion of a bulk-data record has already been |
| 1287 | * committed to disk, we need only adjust the layer2 |
| 1288 | * statistics in the same transaction as our B-Tree insert. |
| 1289 | */ |
| 1290 | KKASSERT(record->leaf.data_offset != 0); |
| 1291 | error = hammer_blockmap_finalize(trans, |
| 1292 | record->resv, |
| 1293 | record->leaf.data_offset, |
| 1294 | record->leaf.data_len); |
| 1295 | |
| 1296 | if (hammer_live_dedup == 2 && |
| 1297 | (record->flags & HAMMER_RECF_DEDUPED) == 0) { |
| 1298 | hammer_dedup_cache_add(record->ip, &record->leaf); |
| 1299 | } |
| 1300 | } else if (record->data && record->leaf.data_len) { |
| 1301 | /* |
| 1302 | * Wholely cached record, with data. Allocate the data. |
| 1303 | */ |
| 1304 | bdata = hammer_alloc_data(trans, record->leaf.data_len, |
| 1305 | record->leaf.base.rec_type, |
| 1306 | &record->leaf.data_offset, |
| 1307 | &cursor->data_buffer, |
| 1308 | 0, &error); |
| 1309 | if (bdata == NULL) |
| 1310 | goto done_unlock; |
| 1311 | hammer_crc_set_leaf(record->data, &record->leaf); |
| 1312 | hammer_modify_buffer(trans, cursor->data_buffer, NULL, 0); |
| 1313 | bcopy(record->data, bdata, record->leaf.data_len); |
| 1314 | hammer_modify_buffer_done(cursor->data_buffer); |
| 1315 | } else { |
| 1316 | /* |
| 1317 | * Wholely cached record, without data. |
| 1318 | */ |
| 1319 | record->leaf.data_offset = 0; |
| 1320 | record->leaf.data_crc = 0; |
| 1321 | } |
| 1322 | |
| 1323 | error = hammer_btree_insert(cursor, &record->leaf, &doprop); |
| 1324 | if (hammer_debug_inode && error) { |
| 1325 | kprintf("BTREE INSERT error %d @ %016llx:%d key %016llx\n", |
| 1326 | error, |
| 1327 | (long long)cursor->node->node_offset, |
| 1328 | cursor->index, |
| 1329 | (long long)record->leaf.base.key); |
| 1330 | } |
| 1331 | |
| 1332 | /* |
| 1333 | * Our record is on-disk and we normally mark the in-memory version |
| 1334 | * as having been committed (and not BE-deleted). |
| 1335 | * |
| 1336 | * If the record represented a directory deletion but we had to |
| 1337 | * sync a valid directory entry to disk due to dependancies, |
| 1338 | * we must convert the record to a covering delete so the |
| 1339 | * frontend does not have visibility on the synced entry. |
| 1340 | * |
| 1341 | * WARNING: cursor's leaf pointer may have changed after do_propagation |
| 1342 | * returns! |
| 1343 | */ |
| 1344 | if (error == 0) { |
| 1345 | if (doprop) { |
| 1346 | hammer_btree_do_propagation(cursor, |
| 1347 | record->ip->pfsm, |
| 1348 | &record->leaf); |
| 1349 | } |
| 1350 | if (record->flags & HAMMER_RECF_CONVERT_DELETE) { |
| 1351 | /* |
| 1352 | * Must convert deleted directory entry add |
| 1353 | * to a directory entry delete. |
| 1354 | */ |
| 1355 | KKASSERT(record->type == HAMMER_MEM_RECORD_ADD); |
| 1356 | record->flags &= ~HAMMER_RECF_DELETED_FE; |
| 1357 | record->type = HAMMER_MEM_RECORD_DEL; |
| 1358 | KKASSERT(record->ip->obj_id == record->leaf.base.obj_id); |
| 1359 | KKASSERT(record->flush_state == HAMMER_FST_FLUSH); |
| 1360 | record->flags &= ~HAMMER_RECF_CONVERT_DELETE; |
| 1361 | KKASSERT((record->flags & (HAMMER_RECF_COMMITTED | |
| 1362 | HAMMER_RECF_DELETED_BE)) == 0); |
| 1363 | /* converted record is not yet committed */ |
| 1364 | /* hammer_flush_record_done takes care of the rest */ |
| 1365 | } else { |
| 1366 | /* |
| 1367 | * Everything went fine and we are now done with |
| 1368 | * this record. |
| 1369 | */ |
| 1370 | record->flags |= HAMMER_RECF_COMMITTED; |
| 1371 | ++record->ip->rec_generation; |
| 1372 | } |
| 1373 | } else { |
| 1374 | if (record->leaf.data_offset) { |
| 1375 | hammer_blockmap_free(trans, record->leaf.data_offset, |
| 1376 | record->leaf.data_len); |
| 1377 | } |
| 1378 | } |
| 1379 | done_unlock: |
| 1380 | hammer_sync_unlock(trans); |
| 1381 | done: |
| 1382 | return(error); |
| 1383 | } |
| 1384 | |
| 1385 | /* |
| 1386 | * Add the record to the inode's rec_tree. The low 32 bits of a directory |
| 1387 | * entry's key is used to deal with hash collisions in the upper 32 bits. |
| 1388 | * A unique 64 bit key is generated in-memory and may be regenerated a |
| 1389 | * second time when the directory record is flushed to the on-disk B-Tree. |
| 1390 | * |
| 1391 | * A referenced record is passed to this function. This function |
| 1392 | * eats the reference. If an error occurs the record will be deleted. |
| 1393 | * |
| 1394 | * A copy of the temporary record->data pointer provided by the caller |
| 1395 | * will be made. |
| 1396 | */ |
| 1397 | int |
| 1398 | hammer_mem_add(hammer_record_t record) |
| 1399 | { |
| 1400 | hammer_mount_t hmp = record->ip->hmp; |
| 1401 | |
| 1402 | /* |
| 1403 | * Make a private copy of record->data |
| 1404 | */ |
| 1405 | if (record->data) |
| 1406 | KKASSERT(record->flags & HAMMER_RECF_ALLOCDATA); |
| 1407 | |
| 1408 | /* |
| 1409 | * Insert into the RB tree. A unique key should have already |
| 1410 | * been selected if this is a directory entry. |
| 1411 | */ |
| 1412 | if (RB_INSERT(hammer_rec_rb_tree, &record->ip->rec_tree, record)) { |
| 1413 | record->flags |= HAMMER_RECF_DELETED_FE; |
| 1414 | hammer_rel_mem_record(record); |
| 1415 | return (EEXIST); |
| 1416 | } |
| 1417 | ++hmp->count_newrecords; |
| 1418 | ++hmp->rsv_recs; |
| 1419 | ++record->ip->rsv_recs; |
| 1420 | record->ip->hmp->rsv_databytes += record->leaf.data_len; |
| 1421 | record->flags |= HAMMER_RECF_ONRBTREE; |
| 1422 | hammer_modify_inode(NULL, record->ip, HAMMER_INODE_XDIRTY); |
| 1423 | hammer_rel_mem_record(record); |
| 1424 | return(0); |
| 1425 | } |
| 1426 | |
| 1427 | /************************************************************************ |
| 1428 | * HAMMER INODE MERGED-RECORD FUNCTIONS * |
| 1429 | ************************************************************************ |
| 1430 | * |
| 1431 | * These functions augment the B-Tree scanning functions in hammer_btree.c |
| 1432 | * by merging in-memory records with on-disk records. |
| 1433 | */ |
| 1434 | |
| 1435 | /* |
| 1436 | * Locate a particular record either in-memory or on-disk. |
| 1437 | * |
| 1438 | * NOTE: This is basically a standalone routine, hammer_ip_next() may |
| 1439 | * NOT be called to iterate results. |
| 1440 | */ |
| 1441 | int |
| 1442 | hammer_ip_lookup(hammer_cursor_t cursor) |
| 1443 | { |
| 1444 | int error; |
| 1445 | |
| 1446 | /* |
| 1447 | * If the element is in-memory return it without searching the |
| 1448 | * on-disk B-Tree |
| 1449 | */ |
| 1450 | KKASSERT(cursor->ip); |
| 1451 | error = hammer_mem_lookup(cursor); |
| 1452 | if (error == 0) { |
| 1453 | cursor->leaf = &cursor->iprec->leaf; |
| 1454 | return(error); |
| 1455 | } |
| 1456 | if (error != ENOENT) |
| 1457 | return(error); |
| 1458 | |
| 1459 | /* |
| 1460 | * If the inode has on-disk components search the on-disk B-Tree. |
| 1461 | */ |
| 1462 | if ((cursor->ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DONDISK)) == 0) |
| 1463 | return(error); |
| 1464 | error = hammer_btree_lookup(cursor); |
| 1465 | if (error == 0) |
| 1466 | error = hammer_btree_extract(cursor, HAMMER_CURSOR_GET_LEAF); |
| 1467 | return(error); |
| 1468 | } |
| 1469 | |
| 1470 | /* |
| 1471 | * Helper for hammer_ip_first()/hammer_ip_next() |
| 1472 | * |
| 1473 | * NOTE: Both ATEDISK and DISKEOF will be set the same. This sets up |
| 1474 | * hammer_ip_first() for calling hammer_ip_next(), and sets up the re-seek |
| 1475 | * state if hammer_ip_next() needs to re-seek. |
| 1476 | */ |
| 1477 | static __inline |
| 1478 | int |
| 1479 | _hammer_ip_seek_btree(hammer_cursor_t cursor) |
| 1480 | { |
| 1481 | hammer_inode_t ip = cursor->ip; |
| 1482 | int error; |
| 1483 | |
| 1484 | if (ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DONDISK)) { |
| 1485 | error = hammer_btree_lookup(cursor); |
| 1486 | if (error == ENOENT || error == EDEADLK) { |
| 1487 | if (hammer_debug_general & 0x2000) { |
| 1488 | kprintf("error %d node %p %016llx index %d\n", |
| 1489 | error, cursor->node, |
| 1490 | (long long)cursor->node->node_offset, |
| 1491 | cursor->index); |
| 1492 | } |
| 1493 | cursor->flags &= ~HAMMER_CURSOR_ATEDISK; |
| 1494 | error = hammer_btree_iterate(cursor); |
| 1495 | } |
| 1496 | if (error == 0) { |
| 1497 | cursor->flags &= ~(HAMMER_CURSOR_DISKEOF | |
| 1498 | HAMMER_CURSOR_ATEDISK); |
| 1499 | } else { |
| 1500 | cursor->flags |= HAMMER_CURSOR_DISKEOF | |
| 1501 | HAMMER_CURSOR_ATEDISK; |
| 1502 | if (error == ENOENT) |
| 1503 | error = 0; |
| 1504 | } |
| 1505 | } else { |
| 1506 | cursor->flags |= HAMMER_CURSOR_DISKEOF | HAMMER_CURSOR_ATEDISK; |
| 1507 | error = 0; |
| 1508 | } |
| 1509 | return(error); |
| 1510 | } |
| 1511 | |
| 1512 | /* |
| 1513 | * Helper for hammer_ip_next() |
| 1514 | * |
| 1515 | * The caller has determined that the media cursor is further along than the |
| 1516 | * memory cursor and must be reseeked after a generation number change. |
| 1517 | */ |
| 1518 | static |
| 1519 | int |
| 1520 | _hammer_ip_reseek(hammer_cursor_t cursor) |
| 1521 | { |
| 1522 | struct hammer_base_elm save; |
| 1523 | hammer_btree_elm_t elm; |
| 1524 | int error; |
| 1525 | int r; |
| 1526 | int again = 0; |
| 1527 | |
| 1528 | /* |
| 1529 | * Do the re-seek. |
| 1530 | */ |
| 1531 | kprintf("HAMMER: Debug: re-seeked during scan @ino=%016llx\n", |
| 1532 | (long long)cursor->ip->obj_id); |
| 1533 | save = cursor->key_beg; |
| 1534 | cursor->key_beg = cursor->iprec->leaf.base; |
| 1535 | error = _hammer_ip_seek_btree(cursor); |
| 1536 | KKASSERT(error == 0); |
| 1537 | cursor->key_beg = save; |
| 1538 | |
| 1539 | /* |
| 1540 | * If the memory record was previous returned to |
| 1541 | * the caller and the media record matches |
| 1542 | * (-1/+1: only create_tid differs), then iterate |
| 1543 | * the media record to avoid a double result. |
| 1544 | */ |
| 1545 | if ((cursor->flags & HAMMER_CURSOR_ATEDISK) == 0 && |
| 1546 | (cursor->flags & HAMMER_CURSOR_LASTWASMEM)) { |
| 1547 | elm = &cursor->node->ondisk->elms[cursor->index]; |
| 1548 | r = hammer_btree_cmp(&elm->base, |
| 1549 | &cursor->iprec->leaf.base); |
| 1550 | if (cursor->flags & HAMMER_CURSOR_ASOF) { |
| 1551 | if (r >= -1 && r <= 1) { |
| 1552 | kprintf("HAMMER: Debug: iterated after " |
| 1553 | "re-seek (asof r=%d)\n", r); |
| 1554 | cursor->flags |= HAMMER_CURSOR_ATEDISK; |
| 1555 | again = 1; |
| 1556 | } |
| 1557 | } else { |
| 1558 | if (r == 0) { |
| 1559 | kprintf("HAMMER: Debug: iterated after " |
| 1560 | "re-seek\n"); |
| 1561 | cursor->flags |= HAMMER_CURSOR_ATEDISK; |
| 1562 | again = 1; |
| 1563 | } |
| 1564 | } |
| 1565 | } |
| 1566 | return(again); |
| 1567 | } |
| 1568 | |
| 1569 | /* |
| 1570 | * Locate the first record within the cursor's key_beg/key_end range, |
| 1571 | * restricted to a particular inode. 0 is returned on success, ENOENT |
| 1572 | * if no records matched the requested range, or some other error. |
| 1573 | * |
| 1574 | * When 0 is returned hammer_ip_next() may be used to iterate additional |
| 1575 | * records within the requested range. |
| 1576 | * |
| 1577 | * This function can return EDEADLK, requiring the caller to terminate |
| 1578 | * the cursor and try again. |
| 1579 | */ |
| 1580 | |
| 1581 | int |
| 1582 | hammer_ip_first(hammer_cursor_t cursor) |
| 1583 | { |
| 1584 | hammer_inode_t ip __debugvar = cursor->ip; |
| 1585 | int error; |
| 1586 | |
| 1587 | KKASSERT(ip != NULL); |
| 1588 | |
| 1589 | /* |
| 1590 | * Clean up fields and setup for merged scan |
| 1591 | */ |
| 1592 | cursor->flags &= ~HAMMER_CURSOR_RETEST; |
| 1593 | |
| 1594 | /* |
| 1595 | * Search the in-memory record list (Red-Black tree). Unlike the |
| 1596 | * B-Tree search, mem_first checks for records in the range. |
| 1597 | * |
| 1598 | * This function will setup both ATEMEM and MEMEOF properly for |
| 1599 | * the ip iteration. ATEMEM will be set if MEMEOF is set. |
| 1600 | */ |
| 1601 | hammer_mem_first(cursor); |
| 1602 | |
| 1603 | /* |
| 1604 | * Detect generation changes during blockages, including |
| 1605 | * blockages which occur on the initial btree search. |
| 1606 | */ |
| 1607 | cursor->rec_generation = cursor->ip->rec_generation; |
| 1608 | |
| 1609 | /* |
| 1610 | * Initial search and result |
| 1611 | */ |
| 1612 | error = _hammer_ip_seek_btree(cursor); |
| 1613 | if (error == 0) |
| 1614 | error = hammer_ip_next(cursor); |
| 1615 | |
| 1616 | return (error); |
| 1617 | } |
| 1618 | |
| 1619 | /* |
| 1620 | * Retrieve the next record in a merged iteration within the bounds of the |
| 1621 | * cursor. This call may be made multiple times after the cursor has been |
| 1622 | * initially searched with hammer_ip_first(). |
| 1623 | * |
| 1624 | * There are numerous special cases in this code to deal with races between |
| 1625 | * in-memory records and on-media records. |
| 1626 | * |
| 1627 | * 0 is returned on success, ENOENT if no further records match the |
| 1628 | * requested range, or some other error code is returned. |
| 1629 | */ |
| 1630 | int |
| 1631 | hammer_ip_next(hammer_cursor_t cursor) |
| 1632 | { |
| 1633 | hammer_btree_elm_t elm; |
| 1634 | hammer_record_t rec; |
| 1635 | hammer_record_t tmprec; |
| 1636 | int error; |
| 1637 | int r; |
| 1638 | |
| 1639 | again: |
| 1640 | /* |
| 1641 | * Get the next on-disk record |
| 1642 | * |
| 1643 | * NOTE: If we deleted the last on-disk record we had scanned |
| 1644 | * ATEDISK will be clear and RETEST will be set, forcing |
| 1645 | * a call to iterate. The fact that ATEDISK is clear causes |
| 1646 | * iterate to re-test the 'current' element. If ATEDISK is |
| 1647 | * set, iterate will skip the 'current' element. |
| 1648 | */ |
| 1649 | error = 0; |
| 1650 | if ((cursor->flags & HAMMER_CURSOR_DISKEOF) == 0) { |
| 1651 | if (cursor->flags & (HAMMER_CURSOR_ATEDISK | |
| 1652 | HAMMER_CURSOR_RETEST)) { |
| 1653 | error = hammer_btree_iterate(cursor); |
| 1654 | cursor->flags &= ~HAMMER_CURSOR_RETEST; |
| 1655 | if (error == 0) { |
| 1656 | cursor->flags &= ~HAMMER_CURSOR_ATEDISK; |
| 1657 | hammer_cache_node(&cursor->ip->cache[1], |
| 1658 | cursor->node); |
| 1659 | } else if (error == ENOENT) { |
| 1660 | cursor->flags |= HAMMER_CURSOR_DISKEOF | |
| 1661 | HAMMER_CURSOR_ATEDISK; |
| 1662 | error = 0; |
| 1663 | } |
| 1664 | } |
| 1665 | } |
| 1666 | |
| 1667 | /* |
| 1668 | * If the generation changed the backend has deleted or committed |
| 1669 | * one or more memory records since our last check. |
| 1670 | * |
| 1671 | * When this case occurs if the disk cursor is > current memory record |
| 1672 | * or the disk cursor is at EOF, we must re-seek the disk-cursor. |
| 1673 | * Since the cursor is ahead it must have not yet been eaten (if |
| 1674 | * not at eof anyway). (XXX data offset case?) |
| 1675 | * |
| 1676 | * NOTE: we are not doing a full check here. That will be handled |
| 1677 | * later on. |
| 1678 | * |
| 1679 | * If we have exhausted all memory records we do not have to do any |
| 1680 | * further seeks. |
| 1681 | */ |
| 1682 | while (cursor->rec_generation != cursor->ip->rec_generation && |
| 1683 | error == 0 |
| 1684 | ) { |
| 1685 | kprintf("HAMMER: Debug: generation changed during scan @ino=%016llx\n", (long long)cursor->ip->obj_id); |
| 1686 | cursor->rec_generation = cursor->ip->rec_generation; |
| 1687 | if (cursor->flags & HAMMER_CURSOR_MEMEOF) |
| 1688 | break; |
| 1689 | if (cursor->flags & HAMMER_CURSOR_DISKEOF) { |
| 1690 | r = 1; |
| 1691 | } else { |
| 1692 | KKASSERT((cursor->flags & HAMMER_CURSOR_ATEDISK) == 0); |
| 1693 | elm = &cursor->node->ondisk->elms[cursor->index]; |
| 1694 | r = hammer_btree_cmp(&elm->base, |
| 1695 | &cursor->iprec->leaf.base); |
| 1696 | } |
| 1697 | |
| 1698 | /* |
| 1699 | * Do we re-seek the media cursor? |
| 1700 | */ |
| 1701 | if (r > 0) { |
| 1702 | if (_hammer_ip_reseek(cursor)) |
| 1703 | goto again; |
| 1704 | } |
| 1705 | } |
| 1706 | |
| 1707 | /* |
| 1708 | * We can now safely get the next in-memory record. We cannot |
| 1709 | * block here. |
| 1710 | * |
| 1711 | * hammer_rec_scan_cmp: Is the record still in our general range, |
| 1712 | * (non-inclusive of snapshot exclusions)? |
| 1713 | * hammer_rec_scan_callback: Is the record in our snapshot? |
| 1714 | */ |
| 1715 | tmprec = NULL; |
| 1716 | if ((cursor->flags & HAMMER_CURSOR_MEMEOF) == 0) { |
| 1717 | /* |
| 1718 | * If the current memory record was eaten then get the next |
| 1719 | * one. Stale records are skipped. |
| 1720 | */ |
| 1721 | if (cursor->flags & HAMMER_CURSOR_ATEMEM) { |
| 1722 | tmprec = cursor->iprec; |
| 1723 | cursor->iprec = NULL; |
| 1724 | rec = hammer_rec_rb_tree_RB_NEXT(tmprec); |
| 1725 | while (rec) { |
| 1726 | if (hammer_rec_scan_cmp(rec, cursor) != 0) |
| 1727 | break; |
| 1728 | if (hammer_rec_scan_callback(rec, cursor) != 0) |
| 1729 | break; |
| 1730 | rec = hammer_rec_rb_tree_RB_NEXT(rec); |
| 1731 | } |
| 1732 | if (cursor->iprec) { |
| 1733 | KKASSERT(cursor->iprec == rec); |
| 1734 | cursor->flags &= ~HAMMER_CURSOR_ATEMEM; |
| 1735 | } else { |
| 1736 | cursor->flags |= HAMMER_CURSOR_MEMEOF; |
| 1737 | } |
| 1738 | cursor->flags &= ~HAMMER_CURSOR_LASTWASMEM; |
| 1739 | } |
| 1740 | } |
| 1741 | |
| 1742 | /* |
| 1743 | * MEMORY RECORD VALIDITY TEST |
| 1744 | * |
| 1745 | * (We still can't block, which is why tmprec is being held so |
| 1746 | * long). |
| 1747 | * |
| 1748 | * If the memory record is no longer valid we skip it. It may |
| 1749 | * have been deleted by the frontend. If it was deleted or |
| 1750 | * committed by the backend the generation change re-seeked the |
| 1751 | * disk cursor and the record will be present there. |
| 1752 | */ |
| 1753 | if (error == 0 && (cursor->flags & HAMMER_CURSOR_MEMEOF) == 0) { |
| 1754 | KKASSERT(cursor->iprec); |
| 1755 | KKASSERT((cursor->flags & HAMMER_CURSOR_ATEMEM) == 0); |
| 1756 | if (!hammer_ip_iterate_mem_good(cursor, cursor->iprec)) { |
| 1757 | cursor->flags |= HAMMER_CURSOR_ATEMEM; |
| 1758 | if (tmprec) |
| 1759 | hammer_rel_mem_record(tmprec); |
| 1760 | goto again; |
| 1761 | } |
| 1762 | } |
| 1763 | if (tmprec) |
| 1764 | hammer_rel_mem_record(tmprec); |
| 1765 | |
| 1766 | /* |
| 1767 | * Extract either the disk or memory record depending on their |
| 1768 | * relative position. |
| 1769 | */ |
| 1770 | error = 0; |
| 1771 | switch(cursor->flags & (HAMMER_CURSOR_ATEDISK | HAMMER_CURSOR_ATEMEM)) { |
| 1772 | case 0: |
| 1773 | /* |
| 1774 | * Both entries valid. Compare the entries and nominally |
| 1775 | * return the first one in the sort order. Numerous cases |
| 1776 | * require special attention, however. |
| 1777 | */ |
| 1778 | elm = &cursor->node->ondisk->elms[cursor->index]; |
| 1779 | r = hammer_btree_cmp(&elm->base, &cursor->iprec->leaf.base); |
| 1780 | |
| 1781 | /* |
| 1782 | * If the two entries differ only by their key (-2/2) or |
| 1783 | * create_tid (-1/1), and are DATA records, we may have a |
| 1784 | * nominal match. We have to calculate the base file |
| 1785 | * offset of the data. |
| 1786 | */ |
| 1787 | if (r <= 2 && r >= -2 && r != 0 && |
| 1788 | cursor->ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE && |
| 1789 | cursor->iprec->type == HAMMER_MEM_RECORD_DATA) { |
| 1790 | int64_t base1 = elm->leaf.base.key - elm->leaf.data_len; |
| 1791 | int64_t base2 = cursor->iprec->leaf.base.key - |
| 1792 | cursor->iprec->leaf.data_len; |
| 1793 | if (base1 == base2) |
| 1794 | r = 0; |
| 1795 | } |
| 1796 | |
| 1797 | if (r < 0) { |
| 1798 | error = hammer_btree_extract(cursor, |
| 1799 | HAMMER_CURSOR_GET_LEAF); |
| 1800 | cursor->flags |= HAMMER_CURSOR_ATEDISK; |
| 1801 | cursor->flags &= ~HAMMER_CURSOR_LASTWASMEM; |
| 1802 | break; |
| 1803 | } |
| 1804 | |
| 1805 | /* |
| 1806 | * If the entries match exactly the memory entry is either |
| 1807 | * an on-disk directory entry deletion or a bulk data |
| 1808 | * overwrite. If it is a directory entry deletion we eat |
| 1809 | * both entries. |
| 1810 | * |
| 1811 | * For the bulk-data overwrite case it is possible to have |
| 1812 | * visibility into both, which simply means the syncer |
| 1813 | * hasn't gotten around to doing the delete+insert sequence |
| 1814 | * on the B-Tree. Use the memory entry and throw away the |
| 1815 | * on-disk entry. |
| 1816 | * |
| 1817 | * If the in-memory record is not either of these we |
| 1818 | * probably caught the syncer while it was syncing it to |
| 1819 | * the media. Since we hold a shared lock on the cursor, |
| 1820 | * the in-memory record had better be marked deleted at |
| 1821 | * this point. |
| 1822 | */ |
| 1823 | if (r == 0) { |
| 1824 | if (cursor->iprec->type == HAMMER_MEM_RECORD_DEL) { |
| 1825 | if ((cursor->flags & HAMMER_CURSOR_DELETE_VISIBILITY) == 0) { |
| 1826 | cursor->flags |= HAMMER_CURSOR_ATEDISK; |
| 1827 | cursor->flags |= HAMMER_CURSOR_ATEMEM; |
| 1828 | goto again; |
| 1829 | } |
| 1830 | } else if (cursor->iprec->type == HAMMER_MEM_RECORD_DATA) { |
| 1831 | if ((cursor->flags & HAMMER_CURSOR_DELETE_VISIBILITY) == 0) { |
| 1832 | cursor->flags |= HAMMER_CURSOR_ATEDISK; |
| 1833 | } |
| 1834 | /* fall through to memory entry */ |
| 1835 | } else { |
| 1836 | panic("hammer_ip_next: duplicate mem/b-tree entry %p %d %08x", cursor->iprec, cursor->iprec->type, cursor->iprec->flags); |
| 1837 | cursor->flags |= HAMMER_CURSOR_ATEMEM; |
| 1838 | goto again; |
| 1839 | } |
| 1840 | } |
| 1841 | /* fall through to the memory entry */ |
| 1842 | case HAMMER_CURSOR_ATEDISK: |
| 1843 | /* |
| 1844 | * Only the memory entry is valid. |
| 1845 | */ |
| 1846 | cursor->leaf = &cursor->iprec->leaf; |
| 1847 | cursor->flags |= HAMMER_CURSOR_ATEMEM; |
| 1848 | cursor->flags |= HAMMER_CURSOR_LASTWASMEM; |
| 1849 | |
| 1850 | /* |
| 1851 | * If the memory entry is an on-disk deletion we should have |
| 1852 | * also had found a B-Tree record. If the backend beat us |
| 1853 | * to it it would have interlocked the cursor and we should |
| 1854 | * have seen the in-memory record marked DELETED_FE. |
| 1855 | */ |
| 1856 | if (cursor->iprec->type == HAMMER_MEM_RECORD_DEL && |
| 1857 | (cursor->flags & HAMMER_CURSOR_DELETE_VISIBILITY) == 0) { |
| 1858 | panic("hammer_ip_next: del-on-disk with no b-tree entry iprec %p flags %08x", cursor->iprec, cursor->iprec->flags); |
| 1859 | } |
| 1860 | break; |
| 1861 | case HAMMER_CURSOR_ATEMEM: |
| 1862 | /* |
| 1863 | * Only the disk entry is valid |
| 1864 | */ |
| 1865 | error = hammer_btree_extract(cursor, HAMMER_CURSOR_GET_LEAF); |
| 1866 | cursor->flags |= HAMMER_CURSOR_ATEDISK; |
| 1867 | cursor->flags &= ~HAMMER_CURSOR_LASTWASMEM; |
| 1868 | break; |
| 1869 | default: |
| 1870 | /* |
| 1871 | * Neither entry is valid |
| 1872 | * |
| 1873 | * XXX error not set properly |
| 1874 | */ |
| 1875 | cursor->flags &= ~HAMMER_CURSOR_LASTWASMEM; |
| 1876 | cursor->leaf = NULL; |
| 1877 | error = ENOENT; |
| 1878 | break; |
| 1879 | } |
| 1880 | return(error); |
| 1881 | } |
| 1882 | |
| 1883 | /* |
| 1884 | * Resolve the cursor->data pointer for the current cursor position in |
| 1885 | * a merged iteration. |
| 1886 | */ |
| 1887 | int |
| 1888 | hammer_ip_resolve_data(hammer_cursor_t cursor) |
| 1889 | { |
| 1890 | hammer_record_t record; |
| 1891 | int error; |
| 1892 | |
| 1893 | if (hammer_cursor_inmem(cursor)) { |
| 1894 | /* |
| 1895 | * The data associated with an in-memory record is usually |
| 1896 | * kmalloced, but reserve-ahead data records will have an |
| 1897 | * on-disk reference. |
| 1898 | * |
| 1899 | * NOTE: Reserve-ahead data records must be handled in the |
| 1900 | * context of the related high level buffer cache buffer |
| 1901 | * to interlock against async writes. |
| 1902 | */ |
| 1903 | record = cursor->iprec; |
| 1904 | cursor->data = record->data; |
| 1905 | error = 0; |
| 1906 | if (cursor->data == NULL) { |
| 1907 | KKASSERT(record->leaf.base.rec_type == |
| 1908 | HAMMER_RECTYPE_DATA); |
| 1909 | cursor->data = hammer_bread_ext(cursor->trans->hmp, |
| 1910 | record->leaf.data_offset, |
| 1911 | record->leaf.data_len, |
| 1912 | &error, |
| 1913 | &cursor->data_buffer); |
| 1914 | } |
| 1915 | } else { |
| 1916 | cursor->leaf = &cursor->node->ondisk->elms[cursor->index].leaf; |
| 1917 | error = hammer_btree_extract(cursor, HAMMER_CURSOR_GET_DATA); |
| 1918 | } |
| 1919 | return(error); |
| 1920 | } |
| 1921 | |
| 1922 | /* |
| 1923 | * Backend truncation / record replacement - delete records in range. |
| 1924 | * |
| 1925 | * Delete all records within the specified range for inode ip. In-memory |
| 1926 | * records still associated with the frontend are ignored. |
| 1927 | * |
| 1928 | * If truncating is non-zero in-memory records associated with the back-end |
| 1929 | * are ignored. If truncating is > 1 we can return EWOULDBLOCK. |
| 1930 | * |
| 1931 | * NOTES: |
| 1932 | * |
| 1933 | * * An unaligned range will cause new records to be added to cover |
| 1934 | * the edge cases. (XXX not implemented yet). |
| 1935 | * |
| 1936 | * * Replacement via reservations (see hammer_ip_sync_record_cursor()) |
| 1937 | * also do not deal with unaligned ranges. |
| 1938 | * |
| 1939 | * * ran_end is inclusive (e.g. 0,1023 instead of 0,1024). |
| 1940 | * |
| 1941 | * * Record keys for regular file data have to be special-cased since |
| 1942 | * they indicate the end of the range (key = base + bytes). |
| 1943 | * |
| 1944 | * * This function may be asked to delete ridiculously huge ranges, for |
| 1945 | * example if someone truncates or removes a 1TB regular file. We |
| 1946 | * must be very careful on restarts and we may have to stop w/ |
| 1947 | * EWOULDBLOCK to avoid blowing out the buffer cache. |
| 1948 | */ |
| 1949 | int |
| 1950 | hammer_ip_delete_range(hammer_cursor_t cursor, hammer_inode_t ip, |
| 1951 | int64_t ran_beg, int64_t ran_end, int truncating) |
| 1952 | { |
| 1953 | hammer_transaction_t trans = cursor->trans; |
| 1954 | hammer_btree_leaf_elm_t leaf; |
| 1955 | int error; |
| 1956 | int64_t off; |
| 1957 | int64_t tmp64; |
| 1958 | |
| 1959 | #if 0 |
| 1960 | kprintf("delete_range %p %016llx-%016llx\n", ip, ran_beg, ran_end); |
| 1961 | #endif |
| 1962 | |
| 1963 | KKASSERT(trans->type == HAMMER_TRANS_FLS); |
| 1964 | retry: |
| 1965 | hammer_normalize_cursor(cursor); |
| 1966 | cursor->key_beg.localization = ip->obj_localization + |
| 1967 | HAMMER_LOCALIZE_MISC; |
| 1968 | cursor->key_beg.obj_id = ip->obj_id; |
| 1969 | cursor->key_beg.create_tid = 0; |
| 1970 | cursor->key_beg.delete_tid = 0; |
| 1971 | cursor->key_beg.obj_type = 0; |
| 1972 | |
| 1973 | if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { |
| 1974 | cursor->key_beg.key = ran_beg; |
| 1975 | cursor->key_beg.rec_type = HAMMER_RECTYPE_DB; |
| 1976 | } else { |
| 1977 | /* |
| 1978 | * The key in the B-Tree is (base+bytes), so the first possible |
| 1979 | * matching key is ran_beg + 1. |
| 1980 | */ |
| 1981 | cursor->key_beg.key = ran_beg + 1; |
| 1982 | cursor->key_beg.rec_type = HAMMER_RECTYPE_DATA; |
| 1983 | } |
| 1984 | |
| 1985 | cursor->key_end = cursor->key_beg; |
| 1986 | if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { |
| 1987 | cursor->key_end.key = ran_end; |
| 1988 | } else { |
| 1989 | tmp64 = ran_end + MAXPHYS + 1; /* work around GCC-4 bug */ |
| 1990 | if (tmp64 < ran_end) |
| 1991 | cursor->key_end.key = 0x7FFFFFFFFFFFFFFFLL; |
| 1992 | else |
| 1993 | cursor->key_end.key = ran_end + MAXPHYS + 1; |
| 1994 | } |
| 1995 | |
| 1996 | cursor->asof = ip->obj_asof; |
| 1997 | cursor->flags &= ~HAMMER_CURSOR_INITMASK; |
| 1998 | cursor->flags |= HAMMER_CURSOR_ASOF; |
| 1999 | cursor->flags |= HAMMER_CURSOR_DELETE_VISIBILITY; |
| 2000 | cursor->flags |= HAMMER_CURSOR_BACKEND; |
| 2001 | cursor->flags |= HAMMER_CURSOR_END_INCLUSIVE; |
| 2002 | |
| 2003 | error = hammer_ip_first(cursor); |
| 2004 | |
| 2005 | /* |
| 2006 | * Iterate through matching records and mark them as deleted. |
| 2007 | */ |
| 2008 | while (error == 0) { |
| 2009 | leaf = cursor->leaf; |
| 2010 | |
| 2011 | KKASSERT(leaf->base.delete_tid == 0); |
| 2012 | KKASSERT(leaf->base.obj_id == ip->obj_id); |
| 2013 | |
| 2014 | /* |
| 2015 | * There may be overlap cases for regular file data. Also |
| 2016 | * remember the key for a regular file record is (base + len), |
| 2017 | * NOT (base). |
| 2018 | * |
| 2019 | * Note that due to duplicates (mem & media) allowed by |
| 2020 | * DELETE_VISIBILITY, off can wind up less then ran_beg. |
| 2021 | */ |
| 2022 | if (leaf->base.rec_type == HAMMER_RECTYPE_DATA) { |
| 2023 | off = leaf->base.key - leaf->data_len; |
| 2024 | /* |
| 2025 | * Check the left edge case. We currently do not |
| 2026 | * split existing records. |
| 2027 | */ |
| 2028 | if (off < ran_beg && leaf->base.key > ran_beg) { |
| 2029 | panic("hammer left edge case %016llx %d\n", |
| 2030 | (long long)leaf->base.key, |
| 2031 | leaf->data_len); |
| 2032 | } |
| 2033 | |
| 2034 | /* |
| 2035 | * Check the right edge case. Note that the |
| 2036 | * record can be completely out of bounds, which |
| 2037 | * terminates the search. |
| 2038 | * |
| 2039 | * base->key is exclusive of the right edge while |
| 2040 | * ran_end is inclusive of the right edge. The |
| 2041 | * (key - data_len) left boundary is inclusive. |
| 2042 | * |
| 2043 | * XXX theory-check this test at some point, are |
| 2044 | * we missing a + 1 somewhere? Note that ran_end |
| 2045 | * could overflow. |
| 2046 | */ |
| 2047 | if (leaf->base.key - 1 > ran_end) { |
| 2048 | if (leaf->base.key - leaf->data_len > ran_end) |
| 2049 | break; |
| 2050 | panic("hammer right edge case\n"); |
| 2051 | } |
| 2052 | } else { |
| 2053 | off = leaf->base.key; |
| 2054 | } |
| 2055 | |
| 2056 | /* |
| 2057 | * Delete the record. When truncating we do not delete |
| 2058 | * in-memory (data) records because they represent data |
| 2059 | * written after the truncation. |
| 2060 | * |
| 2061 | * This will also physically destroy the B-Tree entry and |
| 2062 | * data if the retention policy dictates. The function |
| 2063 | * will set HAMMER_CURSOR_RETEST to cause hammer_ip_next() |
| 2064 | * to retest the new 'current' element. |
| 2065 | */ |
| 2066 | if (truncating == 0 || hammer_cursor_ondisk(cursor)) { |
| 2067 | error = hammer_ip_delete_record(cursor, ip, trans->tid); |
| 2068 | /* |
| 2069 | * If we have built up too many meta-buffers we risk |
| 2070 | * deadlocking the kernel and must stop. This can |
| 2071 | * occur when deleting ridiculously huge files. |
| 2072 | * sync_trunc_off is updated so the next cycle does |
| 2073 | * not re-iterate records we have already deleted. |
| 2074 | * |
| 2075 | * This is only done with formal truncations. |
| 2076 | */ |
| 2077 | if (truncating > 1 && error == 0 && |
| 2078 | hammer_flusher_meta_limit(ip->hmp)) { |
| 2079 | ip->sync_trunc_off = off; |
| 2080 | error = EWOULDBLOCK; |
| 2081 | } |
| 2082 | } |
| 2083 | if (error) |
| 2084 | break; |
| 2085 | ran_beg = off; /* for restart */ |
| 2086 | error = hammer_ip_next(cursor); |
| 2087 | } |
| 2088 | if (cursor->node) |
| 2089 | hammer_cache_node(&ip->cache[1], cursor->node); |
| 2090 | |
| 2091 | if (error == EDEADLK) { |
| 2092 | hammer_done_cursor(cursor); |
| 2093 | error = hammer_init_cursor(trans, cursor, &ip->cache[1], ip); |
| 2094 | if (error == 0) |
| 2095 | goto retry; |
| 2096 | } |
| 2097 | if (error == ENOENT) |
| 2098 | error = 0; |
| 2099 | return(error); |
| 2100 | } |
| 2101 | |
| 2102 | /* |
| 2103 | * This backend function deletes the specified record on-disk, similar to |
| 2104 | * delete_range but for a specific record. Unlike the exact deletions |
| 2105 | * used when deleting a directory entry this function uses an ASOF search |
| 2106 | * like delete_range. |
| 2107 | * |
| 2108 | * This function may be called with ip->obj_asof set for a slave snapshot, |
| 2109 | * so don't use it. We always delete non-historical records only. |
| 2110 | */ |
| 2111 | static int |
| 2112 | hammer_delete_general(hammer_cursor_t cursor, hammer_inode_t ip, |
| 2113 | hammer_btree_leaf_elm_t leaf) |
| 2114 | { |
| 2115 | hammer_transaction_t trans = cursor->trans; |
| 2116 | int error; |
| 2117 | |
| 2118 | KKASSERT(trans->type == HAMMER_TRANS_FLS); |
| 2119 | retry: |
| 2120 | hammer_normalize_cursor(cursor); |
| 2121 | cursor->key_beg = leaf->base; |
| 2122 | cursor->asof = HAMMER_MAX_TID; |
| 2123 | cursor->flags &= ~HAMMER_CURSOR_INITMASK; |
| 2124 | cursor->flags |= HAMMER_CURSOR_ASOF; |
| 2125 | cursor->flags |= HAMMER_CURSOR_BACKEND; |
| 2126 | cursor->flags &= ~HAMMER_CURSOR_INSERT; |
| 2127 | |
| 2128 | error = hammer_btree_lookup(cursor); |
| 2129 | if (error == 0) { |
| 2130 | error = hammer_ip_delete_record(cursor, ip, trans->tid); |
| 2131 | } |
| 2132 | if (error == EDEADLK) { |
| 2133 | hammer_done_cursor(cursor); |
| 2134 | error = hammer_init_cursor(trans, cursor, &ip->cache[1], ip); |
| 2135 | if (error == 0) |
| 2136 | goto retry; |
| 2137 | } |
| 2138 | return(error); |
| 2139 | } |
| 2140 | |
| 2141 | /* |
| 2142 | * This function deletes remaining auxillary records when an inode is |
| 2143 | * being deleted. This function explicitly does not delete the |
| 2144 | * inode record, directory entry, data, or db records. Those must be |
| 2145 | * properly disposed of prior to this call. |
| 2146 | */ |
| 2147 | int |
| 2148 | hammer_ip_delete_clean(hammer_cursor_t cursor, hammer_inode_t ip, int *countp) |
| 2149 | { |
| 2150 | hammer_transaction_t trans = cursor->trans; |
| 2151 | hammer_btree_leaf_elm_t leaf; |
| 2152 | int error; |
| 2153 | |
| 2154 | KKASSERT(trans->type == HAMMER_TRANS_FLS); |
| 2155 | retry: |
| 2156 | hammer_normalize_cursor(cursor); |
| 2157 | cursor->key_beg.localization = ip->obj_localization + |
| 2158 | HAMMER_LOCALIZE_MISC; |
| 2159 | cursor->key_beg.obj_id = ip->obj_id; |
| 2160 | cursor->key_beg.create_tid = 0; |
| 2161 | cursor->key_beg.delete_tid = 0; |
| 2162 | cursor->key_beg.obj_type = 0; |
| 2163 | cursor->key_beg.rec_type = HAMMER_RECTYPE_CLEAN_START; |
| 2164 | cursor->key_beg.key = HAMMER_MIN_KEY; |
| 2165 | |
| 2166 | cursor->key_end = cursor->key_beg; |
| 2167 | cursor->key_end.rec_type = HAMMER_RECTYPE_MAX; |
| 2168 | cursor->key_end.key = HAMMER_MAX_KEY; |
| 2169 | |
| 2170 | cursor->asof = ip->obj_asof; |
| 2171 | cursor->flags &= ~HAMMER_CURSOR_INITMASK; |
| 2172 | cursor->flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; |
| 2173 | cursor->flags |= HAMMER_CURSOR_DELETE_VISIBILITY; |
| 2174 | cursor->flags |= HAMMER_CURSOR_BACKEND; |
| 2175 | |
| 2176 | error = hammer_ip_first(cursor); |
| 2177 | |
| 2178 | /* |
| 2179 | * Iterate through matching records and mark them as deleted. |
| 2180 | */ |
| 2181 | while (error == 0) { |
| 2182 | leaf = cursor->leaf; |
| 2183 | |
| 2184 | KKASSERT(leaf->base.delete_tid == 0); |
| 2185 | |
| 2186 | /* |
| 2187 | * Mark the record and B-Tree entry as deleted. This will |
| 2188 | * also physically delete the B-Tree entry, record, and |
| 2189 | * data if the retention policy dictates. The function |
| 2190 | * will set HAMMER_CURSOR_RETEST to cause hammer_ip_next() |
| 2191 | * to retest the new 'current' element. |
| 2192 | * |
| 2193 | * Directory entries (and delete-on-disk directory entries) |
| 2194 | * must be synced and cannot be deleted. |
| 2195 | */ |
| 2196 | error = hammer_ip_delete_record(cursor, ip, trans->tid); |
| 2197 | ++*countp; |
| 2198 | if (error) |
| 2199 | break; |
| 2200 | error = hammer_ip_next(cursor); |
| 2201 | } |
| 2202 | if (cursor->node) |
| 2203 | hammer_cache_node(&ip->cache[1], cursor->node); |
| 2204 | if (error == EDEADLK) { |
| 2205 | hammer_done_cursor(cursor); |
| 2206 | error = hammer_init_cursor(trans, cursor, &ip->cache[1], ip); |
| 2207 | if (error == 0) |
| 2208 | goto retry; |
| 2209 | } |
| 2210 | if (error == ENOENT) |
| 2211 | error = 0; |
| 2212 | return(error); |
| 2213 | } |
| 2214 | |
| 2215 | /* |
| 2216 | * Delete the record at the current cursor. On success the cursor will |
| 2217 | * be positioned appropriately for an iteration but may no longer be at |
| 2218 | * a leaf node. |
| 2219 | * |
| 2220 | * This routine is only called from the backend. |
| 2221 | * |
| 2222 | * NOTE: This can return EDEADLK, requiring the caller to terminate the |
| 2223 | * cursor and retry. |
| 2224 | */ |
| 2225 | int |
| 2226 | hammer_ip_delete_record(hammer_cursor_t cursor, hammer_inode_t ip, |
| 2227 | hammer_tid_t tid) |
| 2228 | { |
| 2229 | hammer_record_t iprec; |
| 2230 | hammer_mount_t hmp; |
| 2231 | int error; |
| 2232 | |
| 2233 | KKASSERT(cursor->flags & HAMMER_CURSOR_BACKEND); |
| 2234 | KKASSERT(tid != 0); |
| 2235 | hmp = cursor->node->hmp; |
| 2236 | |
| 2237 | /* |
| 2238 | * In-memory (unsynchronized) records can simply be freed. This |
| 2239 | * only occurs in range iterations since all other records are |
| 2240 | * individually synchronized. Thus there should be no confusion with |
| 2241 | * the interlock. |
| 2242 | * |
| 2243 | * An in-memory record may be deleted before being committed to disk, |
| 2244 | * but could have been accessed in the mean time. The reservation |
| 2245 | * code will deal with the case. |
| 2246 | */ |
| 2247 | if (hammer_cursor_inmem(cursor)) { |
| 2248 | iprec = cursor->iprec; |
| 2249 | KKASSERT((iprec->flags & HAMMER_RECF_INTERLOCK_BE) ==0); |
| 2250 | iprec->flags |= HAMMER_RECF_DELETED_FE; |
| 2251 | iprec->flags |= HAMMER_RECF_DELETED_BE; |
| 2252 | KKASSERT(iprec->ip == ip); |
| 2253 | ++ip->rec_generation; |
| 2254 | return(0); |
| 2255 | } |
| 2256 | |
| 2257 | /* |
| 2258 | * On-disk records are marked as deleted by updating their delete_tid. |
| 2259 | * This does not effect their position in the B-Tree (which is based |
| 2260 | * on their create_tid). |
| 2261 | * |
| 2262 | * Frontend B-Tree operations track inodes so we tell |
| 2263 | * hammer_delete_at_cursor() not to. |
| 2264 | */ |
| 2265 | error = hammer_btree_extract(cursor, HAMMER_CURSOR_GET_LEAF); |
| 2266 | |
| 2267 | if (error == 0) { |
| 2268 | error = hammer_delete_at_cursor( |
| 2269 | cursor, |
| 2270 | HAMMER_DELETE_ADJUST | hammer_nohistory(ip), |
| 2271 | cursor->trans->tid, |
| 2272 | cursor->trans->time32, |
| 2273 | 0, NULL); |
| 2274 | } |
| 2275 | return(error); |
| 2276 | } |
| 2277 | |
| 2278 | /* |
| 2279 | * Used to write a generic record w/optional data to the media b-tree |
| 2280 | * when no inode context is available. Used by the mirroring and |
| 2281 | * snapshot code. |
| 2282 | * |
| 2283 | * Caller must set cursor->key_beg to leaf->base. The cursor must be |
| 2284 | * flagged for backend operation and not flagged ASOF (since we are |
| 2285 | * doing an insertion). |
| 2286 | * |
| 2287 | * This function will acquire the appropriate sync lock and will set |
| 2288 | * the cursor insertion flag for the operation, do the btree lookup, |
| 2289 | * and the insertion, and clear the insertion flag and sync lock before |
| 2290 | * returning. The cursor state will be such that the caller can continue |
| 2291 | * scanning (used by the mirroring code). |
| 2292 | * |
| 2293 | * mode: HAMMER_CREATE_MODE_UMIRROR copyin data, check crc |
| 2294 | * HAMMER_CREATE_MODE_SYS bcopy data, generate crc |
| 2295 | * |
| 2296 | * NOTE: EDEADLK can be returned. The caller must do deadlock handling and |
| 2297 | * retry. |
| 2298 | * |
| 2299 | * EALREADY can be returned if the record already exists (WARNING, |
| 2300 | * because ASOF cannot be used no check is made for illegal |
| 2301 | * duplicates). |
| 2302 | * |
| 2303 | * NOTE: Do not use the function for normal inode-related records as this |
| 2304 | * functions goes directly to the media and is not integrated with |
| 2305 | * in-memory records. |
| 2306 | */ |
| 2307 | int |
| 2308 | hammer_create_at_cursor(hammer_cursor_t cursor, hammer_btree_leaf_elm_t leaf, |
| 2309 | void *udata, int mode) |
| 2310 | { |
| 2311 | hammer_transaction_t trans; |
| 2312 | hammer_buffer_t data_buffer; |
| 2313 | hammer_off_t ndata_offset; |
| 2314 | hammer_tid_t high_tid; |
| 2315 | void *ndata; |
| 2316 | int error; |
| 2317 | int doprop; |
| 2318 | |
| 2319 | trans = cursor->trans; |
| 2320 | data_buffer = NULL; |
| 2321 | ndata_offset = 0; |
| 2322 | doprop = 0; |
| 2323 | |
| 2324 | KKASSERT((cursor->flags & |
| 2325 | (HAMMER_CURSOR_BACKEND | HAMMER_CURSOR_ASOF)) == |
| 2326 | (HAMMER_CURSOR_BACKEND)); |
| 2327 | |
| 2328 | hammer_sync_lock_sh(trans); |
| 2329 | |
| 2330 | if (leaf->data_len) { |
| 2331 | ndata = hammer_alloc_data(trans, leaf->data_len, |
| 2332 | leaf->base.rec_type, |
| 2333 | &ndata_offset, &data_buffer, |
| 2334 | 0, &error); |
| 2335 | if (ndata == NULL) { |
| 2336 | hammer_sync_unlock(trans); |
| 2337 | return (error); |
| 2338 | } |
| 2339 | leaf->data_offset = ndata_offset; |
| 2340 | hammer_modify_buffer(trans, data_buffer, NULL, 0); |
| 2341 | |
| 2342 | switch(mode) { |
| 2343 | case HAMMER_CREATE_MODE_UMIRROR: |
| 2344 | error = copyin(udata, ndata, leaf->data_len); |
| 2345 | if (error == 0) { |
| 2346 | if (hammer_crc_test_leaf(ndata, leaf) == 0) { |
| 2347 | kprintf("data crc mismatch on pipe\n"); |
| 2348 | error = EINVAL; |
| 2349 | } else { |
| 2350 | error = hammer_cursor_localize_data( |
| 2351 | ndata, leaf); |
| 2352 | } |
| 2353 | } |
| 2354 | break; |
| 2355 | case HAMMER_CREATE_MODE_SYS: |
| 2356 | bcopy(udata, ndata, leaf->data_len); |
| 2357 | error = 0; |
| 2358 | hammer_crc_set_leaf(ndata, leaf); |
| 2359 | break; |
| 2360 | default: |
| 2361 | panic("hammer: hammer_create_at_cursor: bad mode %d", |
| 2362 | mode); |
| 2363 | break; /* NOT REACHED */ |
| 2364 | } |
| 2365 | hammer_modify_buffer_done(data_buffer); |
| 2366 | } else { |
| 2367 | leaf->data_offset = 0; |
| 2368 | error = 0; |
| 2369 | ndata = NULL; |
| 2370 | } |
| 2371 | if (error) |
| 2372 | goto failed; |
| 2373 | |
| 2374 | /* |
| 2375 | * Do the insertion. This can fail with a EDEADLK or EALREADY |
| 2376 | */ |
| 2377 | cursor->flags |= HAMMER_CURSOR_INSERT; |
| 2378 | error = hammer_btree_lookup(cursor); |
| 2379 | if (error != ENOENT) { |
| 2380 | if (error == 0) |
| 2381 | error = EALREADY; |
| 2382 | goto failed; |
| 2383 | } |
| 2384 | error = hammer_btree_insert(cursor, leaf, &doprop); |
| 2385 | |
| 2386 | /* |
| 2387 | * Cursor is left on current element, we want to skip it now. |
| 2388 | * (in case the caller is scanning) |
| 2389 | */ |
| 2390 | cursor->flags |= HAMMER_CURSOR_ATEDISK; |
| 2391 | cursor->flags &= ~HAMMER_CURSOR_INSERT; |
| 2392 | |
| 2393 | /* |
| 2394 | * If the insertion happens to be creating (and not just replacing) |
| 2395 | * an inode we have to track it. |
| 2396 | */ |
| 2397 | if (error == 0 && |
| 2398 | leaf->base.rec_type == HAMMER_RECTYPE_INODE && |
| 2399 | leaf->base.delete_tid == 0) { |
| 2400 | hammer_modify_volume_field(trans, trans->rootvol, |
| 2401 | vol0_stat_inodes); |
| 2402 | ++trans->hmp->rootvol->ondisk->vol0_stat_inodes; |
| 2403 | hammer_modify_volume_done(trans->rootvol); |
| 2404 | } |
| 2405 | |
| 2406 | /* |
| 2407 | * vol0_next_tid must track the highest TID stored in the filesystem. |
| 2408 | * We do not need to generate undo for this update. |
| 2409 | */ |
| 2410 | high_tid = leaf->base.create_tid; |
| 2411 | if (high_tid < leaf->base.delete_tid) |
| 2412 | high_tid = leaf->base.delete_tid; |
| 2413 | if (trans->rootvol->ondisk->vol0_next_tid < high_tid) { |
| 2414 | hammer_modify_volume(trans, trans->rootvol, NULL, 0); |
| 2415 | trans->rootvol->ondisk->vol0_next_tid = high_tid; |
| 2416 | hammer_modify_volume_done(trans->rootvol); |
| 2417 | } |
| 2418 | |
| 2419 | /* |
| 2420 | * WARNING! cursor's leaf pointer may have changed after |
| 2421 | * do_propagation returns. |
| 2422 | */ |
| 2423 | if (error == 0 && doprop) |
| 2424 | hammer_btree_do_propagation(cursor, NULL, leaf); |
| 2425 | |
| 2426 | failed: |
| 2427 | /* |
| 2428 | * Cleanup |
| 2429 | */ |
| 2430 | if (error && leaf->data_offset) { |
| 2431 | hammer_blockmap_free(trans, leaf->data_offset, leaf->data_len); |
| 2432 | |
| 2433 | } |
| 2434 | hammer_sync_unlock(trans); |
| 2435 | if (data_buffer) |
| 2436 | hammer_rel_buffer(data_buffer, 0); |
| 2437 | return (error); |
| 2438 | } |
| 2439 | |
| 2440 | /* |
| 2441 | * Delete the B-Tree element at the current cursor and do any necessary |
| 2442 | * mirror propagation. |
| 2443 | * |
| 2444 | * The cursor must be properly positioned for an iteration on return but |
| 2445 | * may be pointing at an internal element. |
| 2446 | * |
| 2447 | * An element can be un-deleted by passing a delete_tid of 0 with |
| 2448 | * HAMMER_DELETE_ADJUST. |
| 2449 | */ |
| 2450 | int |
| 2451 | hammer_delete_at_cursor(hammer_cursor_t cursor, int delete_flags, |
| 2452 | hammer_tid_t delete_tid, u_int32_t delete_ts, |
| 2453 | int track, int64_t *stat_bytes) |
| 2454 | { |
| 2455 | struct hammer_btree_leaf_elm save_leaf; |
| 2456 | hammer_transaction_t trans; |
| 2457 | hammer_btree_leaf_elm_t leaf; |
| 2458 | hammer_node_t node; |
| 2459 | hammer_btree_elm_t elm; |
| 2460 | hammer_off_t data_offset; |
| 2461 | int32_t data_len; |
| 2462 | u_int16_t rec_type; |
| 2463 | int error; |
| 2464 | int icount; |
| 2465 | int doprop; |
| 2466 | |
| 2467 | error = hammer_cursor_upgrade(cursor); |
| 2468 | if (error) |
| 2469 | return(error); |
| 2470 | |
| 2471 | trans = cursor->trans; |
| 2472 | node = cursor->node; |
| 2473 | elm = &node->ondisk->elms[cursor->index]; |
| 2474 | leaf = &elm->leaf; |
| 2475 | KKASSERT(elm->base.btype == HAMMER_BTREE_TYPE_RECORD); |
| 2476 | |
| 2477 | hammer_sync_lock_sh(trans); |
| 2478 | doprop = 0; |
| 2479 | icount = 0; |
| 2480 | |
| 2481 | /* |
| 2482 | * Adjust the delete_tid. Update the mirror_tid propagation field |
| 2483 | * as well. delete_tid can be 0 (undelete -- used by mirroring). |
| 2484 | */ |
| 2485 | if (delete_flags & HAMMER_DELETE_ADJUST) { |
| 2486 | if (elm->base.rec_type == HAMMER_RECTYPE_INODE) { |
| 2487 | if (elm->leaf.base.delete_tid == 0 && delete_tid) |
| 2488 | icount = -1; |
| 2489 | if (elm->leaf.base.delete_tid && delete_tid == 0) |
| 2490 | icount = 1; |
| 2491 | } |
| 2492 | |
| 2493 | hammer_modify_node(trans, node, elm, sizeof(*elm)); |
| 2494 | elm->leaf.base.delete_tid = delete_tid; |
| 2495 | elm->leaf.delete_ts = delete_ts; |
| 2496 | hammer_modify_node_done(node); |
| 2497 | |
| 2498 | if (elm->leaf.base.delete_tid > node->ondisk->mirror_tid) { |
| 2499 | hammer_modify_node_field(trans, node, mirror_tid); |
| 2500 | node->ondisk->mirror_tid = elm->leaf.base.delete_tid; |
| 2501 | hammer_modify_node_done(node); |
| 2502 | doprop = 1; |
| 2503 | if (hammer_debug_general & 0x0002) { |
| 2504 | kprintf("delete_at_cursor: propagate %016llx" |
| 2505 | " @%016llx\n", |
| 2506 | (long long)elm->leaf.base.delete_tid, |
| 2507 | (long long)node->node_offset); |
| 2508 | } |
| 2509 | } |
| 2510 | |
| 2511 | /* |
| 2512 | * Adjust for the iteration. We have deleted the current |
| 2513 | * element and want to clear ATEDISK so the iteration does |
| 2514 | * not skip the element after, which now becomes the current |
| 2515 | * element. This element must be re-tested if doing an |
| 2516 | * iteration, which is handled by the RETEST flag. |
| 2517 | */ |
| 2518 | if ((cursor->flags & HAMMER_CURSOR_DISKEOF) == 0) { |
| 2519 | cursor->flags |= HAMMER_CURSOR_RETEST; |
| 2520 | cursor->flags &= ~HAMMER_CURSOR_ATEDISK; |
| 2521 | } |
| 2522 | |
| 2523 | /* |
| 2524 | * An on-disk record cannot have the same delete_tid |
| 2525 | * as its create_tid. In a chain of record updates |
| 2526 | * this could result in a duplicate record. |
| 2527 | */ |
| 2528 | KKASSERT(elm->leaf.base.delete_tid != |
| 2529 | elm->leaf.base.create_tid); |
| 2530 | } |
| 2531 | |
| 2532 | /* |
| 2533 | * Destroy the B-Tree element if asked (typically if a nohistory |
| 2534 | * file or mount, or when called by the pruning code). |
| 2535 | * |
| 2536 | * Adjust the ATEDISK flag to properly support iterations. |
| 2537 | */ |
| 2538 | if (delete_flags & HAMMER_DELETE_DESTROY) { |
| 2539 | data_offset = elm->leaf.data_offset; |
| 2540 | data_len = elm->leaf.data_len; |
| 2541 | rec_type = elm->leaf.base.rec_type; |
| 2542 | if (doprop) { |
| 2543 | save_leaf = elm->leaf; |
| 2544 | leaf = &save_leaf; |
| 2545 | } |
| 2546 | if (elm->base.rec_type == HAMMER_RECTYPE_INODE && |
| 2547 | elm->leaf.base.delete_tid == 0) { |
| 2548 | icount = -1; |
| 2549 | } |
| 2550 | |
| 2551 | error = hammer_btree_delete(cursor); |
| 2552 | if (error == 0) { |
| 2553 | /* |
| 2554 | * The deletion moves the next element (if any) to |
| 2555 | * the current element position. We must clear |
| 2556 | * ATEDISK so this element is not skipped and we |
| 2557 | * must set RETEST to force any iteration to re-test |
| 2558 | * the element. |
| 2559 | */ |
| 2560 | if ((cursor->flags & HAMMER_CURSOR_DISKEOF) == 0) { |
| 2561 | cursor->flags |= HAMMER_CURSOR_RETEST; |
| 2562 | cursor->flags &= ~HAMMER_CURSOR_ATEDISK; |
| 2563 | } |
| 2564 | } |
| 2565 | if (error == 0) { |
| 2566 | switch(data_offset & HAMMER_OFF_ZONE_MASK) { |
| 2567 | case HAMMER_ZONE_LARGE_DATA: |
| 2568 | case HAMMER_ZONE_SMALL_DATA: |
| 2569 | case HAMMER_ZONE_META: |
| 2570 | hammer_blockmap_free(trans, |
| 2571 | data_offset, data_len); |
| 2572 | break; |
| 2573 | default: |
| 2574 | break; |
| 2575 | } |
| 2576 | } |
| 2577 | } |
| 2578 | |
| 2579 | /* |
| 2580 | * Track inode count and next_tid. This is used by the mirroring |
| 2581 | * and PFS code. icount can be negative, zero, or positive. |
| 2582 | */ |
| 2583 | if (error == 0 && track) { |
| 2584 | if (icount) { |
| 2585 | hammer_modify_volume_field(trans, trans->rootvol, |
| 2586 | vol0_stat_inodes); |
| 2587 | trans->rootvol->ondisk->vol0_stat_inodes += icount; |
| 2588 | hammer_modify_volume_done(trans->rootvol); |
| 2589 | } |
| 2590 | if (trans->rootvol->ondisk->vol0_next_tid < delete_tid) { |
| 2591 | hammer_modify_volume(trans, trans->rootvol, NULL, 0); |
| 2592 | trans->rootvol->ondisk->vol0_next_tid = delete_tid; |
| 2593 | hammer_modify_volume_done(trans->rootvol); |
| 2594 | } |
| 2595 | } |
| 2596 | |
| 2597 | /* |
| 2598 | * mirror_tid propagation occurs if the node's mirror_tid had to be |
| 2599 | * updated while adjusting the delete_tid. |
| 2600 | * |
| 2601 | * This occurs when deleting even in nohistory mode, but does not |
| 2602 | * occur when pruning an already-deleted node. |
| 2603 | * |
| 2604 | * cursor->ip is NULL when called from the pruning, mirroring, |
| 2605 | * and pfs code. If non-NULL propagation will be conditionalized |
| 2606 | * on whether the PFS is in no-history mode or not. |
| 2607 | * |
| 2608 | * WARNING: cursor's leaf pointer may have changed after do_propagation |
| 2609 | * returns! |
| 2610 | */ |
| 2611 | if (doprop) { |
| 2612 | if (cursor->ip) |
| 2613 | hammer_btree_do_propagation(cursor, cursor->ip->pfsm, leaf); |
| 2614 | else |
| 2615 | hammer_btree_do_propagation(cursor, NULL, leaf); |
| 2616 | } |
| 2617 | hammer_sync_unlock(trans); |
| 2618 | return (error); |
| 2619 | } |
| 2620 | |
| 2621 | /* |
| 2622 | * Determine whether we can remove a directory. This routine checks whether |
| 2623 | * a directory is empty or not and enforces flush connectivity. |
| 2624 | * |
| 2625 | * Flush connectivity requires that we block if the target directory is |
| 2626 | * currently flushing, otherwise it may not end up in the same flush group. |
| 2627 | * |
| 2628 | * Returns 0 on success, ENOTEMPTY or EDEADLK (or other errors) on failure. |
| 2629 | */ |
| 2630 | int |
| 2631 | hammer_ip_check_directory_empty(hammer_transaction_t trans, hammer_inode_t ip) |
| 2632 | { |
| 2633 | struct hammer_cursor cursor; |
| 2634 | int error; |
| 2635 | |
| 2636 | /* |
| 2637 | * Check directory empty |
| 2638 | */ |
| 2639 | hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); |
| 2640 | |
| 2641 | cursor.key_beg.localization = ip->obj_localization + |
| 2642 | hammer_dir_localization(ip); |
| 2643 | cursor.key_beg.obj_id = ip->obj_id; |
| 2644 | cursor.key_beg.create_tid = 0; |
| 2645 | cursor.key_beg.delete_tid = 0; |
| 2646 | cursor.key_beg.obj_type = 0; |
| 2647 | cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE + 1; |
| 2648 | cursor.key_beg.key = HAMMER_MIN_KEY; |
| 2649 | |
| 2650 | cursor.key_end = cursor.key_beg; |
| 2651 | cursor.key_end.rec_type = 0xFFFF; |
| 2652 | cursor.key_end.key = HAMMER_MAX_KEY; |
| 2653 | |
| 2654 | cursor.asof = ip->obj_asof; |
| 2655 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; |
| 2656 | |
| 2657 | error = hammer_ip_first(&cursor); |
| 2658 | if (error == ENOENT) |
| 2659 | error = 0; |
| 2660 | else if (error == 0) |
| 2661 | error = ENOTEMPTY; |
| 2662 | hammer_done_cursor(&cursor); |
| 2663 | return(error); |
| 2664 | } |
| 2665 | |
| 2666 | /* |
| 2667 | * Localize the data payload. Directory entries may need their |
| 2668 | * localization adjusted. |
| 2669 | */ |
| 2670 | static |
| 2671 | int |
| 2672 | hammer_cursor_localize_data(hammer_data_ondisk_t data, |
| 2673 | hammer_btree_leaf_elm_t leaf) |
| 2674 | { |
| 2675 | u_int32_t localization; |
| 2676 | |
| 2677 | if (leaf->base.rec_type == HAMMER_RECTYPE_DIRENTRY) { |
| 2678 | localization = leaf->base.localization & |
| 2679 | HAMMER_LOCALIZE_PSEUDOFS_MASK; |
| 2680 | if (data->entry.localization != localization) { |
| 2681 | data->entry.localization = localization; |
| 2682 | hammer_crc_set_leaf(data, leaf); |
| 2683 | } |
| 2684 | } |
| 2685 | return(0); |
| 2686 | } |