Tao Ma | f2c870e | 2009-08-18 11:19:26 +0800 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * refcounttree.c |
| 5 | * |
| 6 | * Copyright (C) 2009 Oracle. All rights reserved. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public |
| 10 | * License version 2 as published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * General Public License for more details. |
| 16 | */ |
| 17 | |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 18 | #include <linux/sort.h> |
Tao Ma | f2c870e | 2009-08-18 11:19:26 +0800 | [diff] [blame] | 19 | #define MLOG_MASK_PREFIX ML_REFCOUNT |
| 20 | #include <cluster/masklog.h> |
| 21 | #include "ocfs2.h" |
| 22 | #include "inode.h" |
| 23 | #include "alloc.h" |
| 24 | #include "suballoc.h" |
| 25 | #include "journal.h" |
| 26 | #include "uptodate.h" |
| 27 | #include "super.h" |
| 28 | #include "buffer_head_io.h" |
| 29 | #include "blockcheck.h" |
Tao Ma | c732eb1 | 2009-08-18 11:21:00 +0800 | [diff] [blame] | 30 | #include "refcounttree.h" |
Tao Ma | 8bf396d | 2009-08-24 11:12:02 +0800 | [diff] [blame] | 31 | #include "sysfile.h" |
Tao Ma | 374a263 | 2009-08-24 11:13:37 +0800 | [diff] [blame] | 32 | #include "dlmglue.h" |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 33 | #include "extent_map.h" |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 34 | #include "aops.h" |
Tao Ma | 492a8a3 | 2009-08-18 11:43:17 +0800 | [diff] [blame] | 35 | #include "xattr.h" |
Tao Ma | 09bf27a | 2009-09-21 10:38:17 +0800 | [diff] [blame] | 36 | #include "namei.h" |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 37 | |
| 38 | #include <linux/bio.h> |
| 39 | #include <linux/blkdev.h> |
| 40 | #include <linux/gfp.h> |
| 41 | #include <linux/slab.h> |
| 42 | #include <linux/writeback.h> |
| 43 | #include <linux/pagevec.h> |
| 44 | #include <linux/swap.h> |
Tao Ma | bd50873 | 2009-09-21 11:25:14 +0800 | [diff] [blame] | 45 | #include <linux/security.h> |
| 46 | #include <linux/fsnotify.h> |
| 47 | #include <linux/quotaops.h> |
| 48 | #include <linux/namei.h> |
| 49 | #include <linux/mount.h> |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 50 | |
| 51 | struct ocfs2_cow_context { |
| 52 | struct inode *inode; |
| 53 | u32 cow_start; |
| 54 | u32 cow_len; |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 55 | struct ocfs2_extent_tree data_et; |
| 56 | struct ocfs2_refcount_tree *ref_tree; |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 57 | struct buffer_head *ref_root_bh; |
| 58 | struct ocfs2_alloc_context *meta_ac; |
| 59 | struct ocfs2_alloc_context *data_ac; |
| 60 | struct ocfs2_cached_dealloc_ctxt dealloc; |
Tao Ma | 492a8a3 | 2009-08-18 11:43:17 +0800 | [diff] [blame] | 61 | void *cow_object; |
| 62 | struct ocfs2_post_refcount *post_refcount; |
| 63 | int extra_credits; |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 64 | int (*get_clusters)(struct ocfs2_cow_context *context, |
| 65 | u32 v_cluster, u32 *p_cluster, |
| 66 | u32 *num_clusters, |
| 67 | unsigned int *extent_flags); |
| 68 | int (*cow_duplicate_clusters)(handle_t *handle, |
| 69 | struct ocfs2_cow_context *context, |
| 70 | u32 cpos, u32 old_cluster, |
| 71 | u32 new_cluster, u32 new_len); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 72 | }; |
Tao Ma | c732eb1 | 2009-08-18 11:21:00 +0800 | [diff] [blame] | 73 | |
| 74 | static inline struct ocfs2_refcount_tree * |
| 75 | cache_info_to_refcount(struct ocfs2_caching_info *ci) |
| 76 | { |
| 77 | return container_of(ci, struct ocfs2_refcount_tree, rf_ci); |
| 78 | } |
Tao Ma | f2c870e | 2009-08-18 11:19:26 +0800 | [diff] [blame] | 79 | |
| 80 | static int ocfs2_validate_refcount_block(struct super_block *sb, |
| 81 | struct buffer_head *bh) |
| 82 | { |
| 83 | int rc; |
| 84 | struct ocfs2_refcount_block *rb = |
| 85 | (struct ocfs2_refcount_block *)bh->b_data; |
| 86 | |
| 87 | mlog(0, "Validating refcount block %llu\n", |
| 88 | (unsigned long long)bh->b_blocknr); |
| 89 | |
| 90 | BUG_ON(!buffer_uptodate(bh)); |
| 91 | |
| 92 | /* |
| 93 | * If the ecc fails, we return the error but otherwise |
| 94 | * leave the filesystem running. We know any error is |
| 95 | * local to this block. |
| 96 | */ |
| 97 | rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check); |
| 98 | if (rc) { |
| 99 | mlog(ML_ERROR, "Checksum failed for refcount block %llu\n", |
| 100 | (unsigned long long)bh->b_blocknr); |
| 101 | return rc; |
| 102 | } |
| 103 | |
| 104 | |
| 105 | if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) { |
| 106 | ocfs2_error(sb, |
| 107 | "Refcount block #%llu has bad signature %.*s", |
| 108 | (unsigned long long)bh->b_blocknr, 7, |
| 109 | rb->rf_signature); |
| 110 | return -EINVAL; |
| 111 | } |
| 112 | |
| 113 | if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) { |
| 114 | ocfs2_error(sb, |
| 115 | "Refcount block #%llu has an invalid rf_blkno " |
| 116 | "of %llu", |
| 117 | (unsigned long long)bh->b_blocknr, |
| 118 | (unsigned long long)le64_to_cpu(rb->rf_blkno)); |
| 119 | return -EINVAL; |
| 120 | } |
| 121 | |
| 122 | if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) { |
| 123 | ocfs2_error(sb, |
| 124 | "Refcount block #%llu has an invalid " |
| 125 | "rf_fs_generation of #%u", |
| 126 | (unsigned long long)bh->b_blocknr, |
| 127 | le32_to_cpu(rb->rf_fs_generation)); |
| 128 | return -EINVAL; |
| 129 | } |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci, |
| 135 | u64 rb_blkno, |
| 136 | struct buffer_head **bh) |
| 137 | { |
| 138 | int rc; |
| 139 | struct buffer_head *tmp = *bh; |
| 140 | |
| 141 | rc = ocfs2_read_block(ci, rb_blkno, &tmp, |
| 142 | ocfs2_validate_refcount_block); |
| 143 | |
| 144 | /* If ocfs2_read_block() got us a new bh, pass it up. */ |
| 145 | if (!rc && !*bh) |
| 146 | *bh = tmp; |
| 147 | |
| 148 | return rc; |
| 149 | } |
Tao Ma | c732eb1 | 2009-08-18 11:21:00 +0800 | [diff] [blame] | 150 | |
| 151 | static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci) |
| 152 | { |
| 153 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); |
| 154 | |
| 155 | return rf->rf_blkno; |
| 156 | } |
| 157 | |
| 158 | static struct super_block * |
| 159 | ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci) |
| 160 | { |
| 161 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); |
| 162 | |
| 163 | return rf->rf_sb; |
| 164 | } |
| 165 | |
| 166 | static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci) |
| 167 | { |
| 168 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); |
| 169 | |
| 170 | spin_lock(&rf->rf_lock); |
| 171 | } |
| 172 | |
| 173 | static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci) |
| 174 | { |
| 175 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); |
| 176 | |
| 177 | spin_unlock(&rf->rf_lock); |
| 178 | } |
| 179 | |
| 180 | static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci) |
| 181 | { |
| 182 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); |
| 183 | |
| 184 | mutex_lock(&rf->rf_io_mutex); |
| 185 | } |
| 186 | |
| 187 | static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci) |
| 188 | { |
| 189 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); |
| 190 | |
| 191 | mutex_unlock(&rf->rf_io_mutex); |
| 192 | } |
| 193 | |
| 194 | static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = { |
| 195 | .co_owner = ocfs2_refcount_cache_owner, |
| 196 | .co_get_super = ocfs2_refcount_cache_get_super, |
| 197 | .co_cache_lock = ocfs2_refcount_cache_lock, |
| 198 | .co_cache_unlock = ocfs2_refcount_cache_unlock, |
| 199 | .co_io_lock = ocfs2_refcount_cache_io_lock, |
| 200 | .co_io_unlock = ocfs2_refcount_cache_io_unlock, |
| 201 | }; |
Tao Ma | 374a263 | 2009-08-24 11:13:37 +0800 | [diff] [blame] | 202 | |
| 203 | static struct ocfs2_refcount_tree * |
| 204 | ocfs2_find_refcount_tree(struct ocfs2_super *osb, u64 blkno) |
| 205 | { |
| 206 | struct rb_node *n = osb->osb_rf_lock_tree.rb_node; |
| 207 | struct ocfs2_refcount_tree *tree = NULL; |
| 208 | |
| 209 | while (n) { |
| 210 | tree = rb_entry(n, struct ocfs2_refcount_tree, rf_node); |
| 211 | |
| 212 | if (blkno < tree->rf_blkno) |
| 213 | n = n->rb_left; |
| 214 | else if (blkno > tree->rf_blkno) |
| 215 | n = n->rb_right; |
| 216 | else |
| 217 | return tree; |
| 218 | } |
| 219 | |
| 220 | return NULL; |
| 221 | } |
| 222 | |
| 223 | /* osb_lock is already locked. */ |
| 224 | static void ocfs2_insert_refcount_tree(struct ocfs2_super *osb, |
| 225 | struct ocfs2_refcount_tree *new) |
| 226 | { |
| 227 | u64 rf_blkno = new->rf_blkno; |
| 228 | struct rb_node *parent = NULL; |
| 229 | struct rb_node **p = &osb->osb_rf_lock_tree.rb_node; |
| 230 | struct ocfs2_refcount_tree *tmp; |
| 231 | |
| 232 | while (*p) { |
| 233 | parent = *p; |
| 234 | |
| 235 | tmp = rb_entry(parent, struct ocfs2_refcount_tree, |
| 236 | rf_node); |
| 237 | |
| 238 | if (rf_blkno < tmp->rf_blkno) |
| 239 | p = &(*p)->rb_left; |
| 240 | else if (rf_blkno > tmp->rf_blkno) |
| 241 | p = &(*p)->rb_right; |
| 242 | else { |
| 243 | /* This should never happen! */ |
| 244 | mlog(ML_ERROR, "Duplicate refcount block %llu found!\n", |
| 245 | (unsigned long long)rf_blkno); |
| 246 | BUG(); |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | rb_link_node(&new->rf_node, parent, p); |
| 251 | rb_insert_color(&new->rf_node, &osb->osb_rf_lock_tree); |
| 252 | } |
| 253 | |
| 254 | static void ocfs2_free_refcount_tree(struct ocfs2_refcount_tree *tree) |
| 255 | { |
| 256 | ocfs2_metadata_cache_exit(&tree->rf_ci); |
| 257 | ocfs2_simple_drop_lockres(OCFS2_SB(tree->rf_sb), &tree->rf_lockres); |
| 258 | ocfs2_lock_res_free(&tree->rf_lockres); |
| 259 | kfree(tree); |
| 260 | } |
| 261 | |
| 262 | static inline void |
| 263 | ocfs2_erase_refcount_tree_from_list_no_lock(struct ocfs2_super *osb, |
| 264 | struct ocfs2_refcount_tree *tree) |
| 265 | { |
| 266 | rb_erase(&tree->rf_node, &osb->osb_rf_lock_tree); |
| 267 | if (osb->osb_ref_tree_lru && osb->osb_ref_tree_lru == tree) |
| 268 | osb->osb_ref_tree_lru = NULL; |
| 269 | } |
| 270 | |
| 271 | static void ocfs2_erase_refcount_tree_from_list(struct ocfs2_super *osb, |
| 272 | struct ocfs2_refcount_tree *tree) |
| 273 | { |
| 274 | spin_lock(&osb->osb_lock); |
| 275 | ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree); |
| 276 | spin_unlock(&osb->osb_lock); |
| 277 | } |
| 278 | |
| 279 | void ocfs2_kref_remove_refcount_tree(struct kref *kref) |
| 280 | { |
| 281 | struct ocfs2_refcount_tree *tree = |
| 282 | container_of(kref, struct ocfs2_refcount_tree, rf_getcnt); |
| 283 | |
| 284 | ocfs2_free_refcount_tree(tree); |
| 285 | } |
| 286 | |
| 287 | static inline void |
| 288 | ocfs2_refcount_tree_get(struct ocfs2_refcount_tree *tree) |
| 289 | { |
| 290 | kref_get(&tree->rf_getcnt); |
| 291 | } |
| 292 | |
| 293 | static inline void |
| 294 | ocfs2_refcount_tree_put(struct ocfs2_refcount_tree *tree) |
| 295 | { |
| 296 | kref_put(&tree->rf_getcnt, ocfs2_kref_remove_refcount_tree); |
| 297 | } |
| 298 | |
| 299 | static inline void ocfs2_init_refcount_tree_ci(struct ocfs2_refcount_tree *new, |
| 300 | struct super_block *sb) |
| 301 | { |
| 302 | ocfs2_metadata_cache_init(&new->rf_ci, &ocfs2_refcount_caching_ops); |
| 303 | mutex_init(&new->rf_io_mutex); |
| 304 | new->rf_sb = sb; |
| 305 | spin_lock_init(&new->rf_lock); |
| 306 | } |
| 307 | |
| 308 | static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb, |
| 309 | struct ocfs2_refcount_tree *new, |
| 310 | u64 rf_blkno, u32 generation) |
| 311 | { |
| 312 | init_rwsem(&new->rf_sem); |
| 313 | ocfs2_refcount_lock_res_init(&new->rf_lockres, osb, |
| 314 | rf_blkno, generation); |
| 315 | } |
| 316 | |
Tao Ma | 8bf396d | 2009-08-24 11:12:02 +0800 | [diff] [blame] | 317 | static struct ocfs2_refcount_tree* |
| 318 | ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno) |
| 319 | { |
| 320 | struct ocfs2_refcount_tree *new; |
| 321 | |
| 322 | new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS); |
| 323 | if (!new) |
| 324 | return NULL; |
| 325 | |
| 326 | new->rf_blkno = rf_blkno; |
| 327 | kref_init(&new->rf_getcnt); |
| 328 | ocfs2_init_refcount_tree_ci(new, osb->sb); |
| 329 | |
| 330 | return new; |
| 331 | } |
| 332 | |
Tao Ma | 374a263 | 2009-08-24 11:13:37 +0800 | [diff] [blame] | 333 | static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno, |
| 334 | struct ocfs2_refcount_tree **ret_tree) |
| 335 | { |
| 336 | int ret = 0; |
| 337 | struct ocfs2_refcount_tree *tree, *new = NULL; |
| 338 | struct buffer_head *ref_root_bh = NULL; |
| 339 | struct ocfs2_refcount_block *ref_rb; |
| 340 | |
| 341 | spin_lock(&osb->osb_lock); |
| 342 | if (osb->osb_ref_tree_lru && |
| 343 | osb->osb_ref_tree_lru->rf_blkno == rf_blkno) |
| 344 | tree = osb->osb_ref_tree_lru; |
| 345 | else |
| 346 | tree = ocfs2_find_refcount_tree(osb, rf_blkno); |
| 347 | if (tree) |
| 348 | goto out; |
| 349 | |
| 350 | spin_unlock(&osb->osb_lock); |
| 351 | |
Tao Ma | 8bf396d | 2009-08-24 11:12:02 +0800 | [diff] [blame] | 352 | new = ocfs2_allocate_refcount_tree(osb, rf_blkno); |
Tao Ma | 374a263 | 2009-08-24 11:13:37 +0800 | [diff] [blame] | 353 | if (!new) { |
| 354 | ret = -ENOMEM; |
Tao Ma | 8bf396d | 2009-08-24 11:12:02 +0800 | [diff] [blame] | 355 | mlog_errno(ret); |
Tao Ma | 374a263 | 2009-08-24 11:13:37 +0800 | [diff] [blame] | 356 | return ret; |
| 357 | } |
Tao Ma | 374a263 | 2009-08-24 11:13:37 +0800 | [diff] [blame] | 358 | /* |
| 359 | * We need the generation to create the refcount tree lock and since |
| 360 | * it isn't changed during the tree modification, we are safe here to |
| 361 | * read without protection. |
| 362 | * We also have to purge the cache after we create the lock since the |
| 363 | * refcount block may have the stale data. It can only be trusted when |
| 364 | * we hold the refcount lock. |
| 365 | */ |
| 366 | ret = ocfs2_read_refcount_block(&new->rf_ci, rf_blkno, &ref_root_bh); |
| 367 | if (ret) { |
| 368 | mlog_errno(ret); |
| 369 | ocfs2_metadata_cache_exit(&new->rf_ci); |
| 370 | kfree(new); |
| 371 | return ret; |
| 372 | } |
| 373 | |
| 374 | ref_rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; |
| 375 | new->rf_generation = le32_to_cpu(ref_rb->rf_generation); |
| 376 | ocfs2_init_refcount_tree_lock(osb, new, rf_blkno, |
| 377 | new->rf_generation); |
| 378 | ocfs2_metadata_cache_purge(&new->rf_ci); |
| 379 | |
| 380 | spin_lock(&osb->osb_lock); |
| 381 | tree = ocfs2_find_refcount_tree(osb, rf_blkno); |
| 382 | if (tree) |
| 383 | goto out; |
| 384 | |
| 385 | ocfs2_insert_refcount_tree(osb, new); |
| 386 | |
| 387 | tree = new; |
| 388 | new = NULL; |
| 389 | |
| 390 | out: |
| 391 | *ret_tree = tree; |
| 392 | |
| 393 | osb->osb_ref_tree_lru = tree; |
| 394 | |
| 395 | spin_unlock(&osb->osb_lock); |
| 396 | |
| 397 | if (new) |
| 398 | ocfs2_free_refcount_tree(new); |
| 399 | |
| 400 | brelse(ref_root_bh); |
| 401 | return ret; |
| 402 | } |
| 403 | |
| 404 | static int ocfs2_get_refcount_block(struct inode *inode, u64 *ref_blkno) |
| 405 | { |
| 406 | int ret; |
| 407 | struct buffer_head *di_bh = NULL; |
| 408 | struct ocfs2_dinode *di; |
| 409 | |
| 410 | ret = ocfs2_read_inode_block(inode, &di_bh); |
| 411 | if (ret) { |
| 412 | mlog_errno(ret); |
| 413 | goto out; |
| 414 | } |
| 415 | |
| 416 | BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); |
| 417 | |
| 418 | di = (struct ocfs2_dinode *)di_bh->b_data; |
| 419 | *ref_blkno = le64_to_cpu(di->i_refcount_loc); |
| 420 | brelse(di_bh); |
| 421 | out: |
| 422 | return ret; |
| 423 | } |
| 424 | |
| 425 | static int __ocfs2_lock_refcount_tree(struct ocfs2_super *osb, |
| 426 | struct ocfs2_refcount_tree *tree, int rw) |
| 427 | { |
| 428 | int ret; |
| 429 | |
| 430 | ret = ocfs2_refcount_lock(tree, rw); |
| 431 | if (ret) { |
| 432 | mlog_errno(ret); |
| 433 | goto out; |
| 434 | } |
| 435 | |
| 436 | if (rw) |
| 437 | down_write(&tree->rf_sem); |
| 438 | else |
| 439 | down_read(&tree->rf_sem); |
| 440 | |
| 441 | out: |
| 442 | return ret; |
| 443 | } |
| 444 | |
| 445 | /* |
| 446 | * Lock the refcount tree pointed by ref_blkno and return the tree. |
| 447 | * In most case, we lock the tree and read the refcount block. |
| 448 | * So read it here if the caller really needs it. |
| 449 | * |
| 450 | * If the tree has been re-created by other node, it will free the |
| 451 | * old one and re-create it. |
| 452 | */ |
| 453 | int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, |
| 454 | u64 ref_blkno, int rw, |
| 455 | struct ocfs2_refcount_tree **ret_tree, |
| 456 | struct buffer_head **ref_bh) |
| 457 | { |
| 458 | int ret, delete_tree = 0; |
| 459 | struct ocfs2_refcount_tree *tree = NULL; |
| 460 | struct buffer_head *ref_root_bh = NULL; |
| 461 | struct ocfs2_refcount_block *rb; |
| 462 | |
| 463 | again: |
| 464 | ret = ocfs2_get_refcount_tree(osb, ref_blkno, &tree); |
| 465 | if (ret) { |
| 466 | mlog_errno(ret); |
| 467 | return ret; |
| 468 | } |
| 469 | |
| 470 | ocfs2_refcount_tree_get(tree); |
| 471 | |
| 472 | ret = __ocfs2_lock_refcount_tree(osb, tree, rw); |
| 473 | if (ret) { |
| 474 | mlog_errno(ret); |
| 475 | ocfs2_refcount_tree_put(tree); |
| 476 | goto out; |
| 477 | } |
| 478 | |
| 479 | ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno, |
| 480 | &ref_root_bh); |
| 481 | if (ret) { |
| 482 | mlog_errno(ret); |
| 483 | ocfs2_unlock_refcount_tree(osb, tree, rw); |
| 484 | ocfs2_refcount_tree_put(tree); |
| 485 | goto out; |
| 486 | } |
| 487 | |
| 488 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; |
| 489 | /* |
| 490 | * If the refcount block has been freed and re-created, we may need |
| 491 | * to recreate the refcount tree also. |
| 492 | * |
| 493 | * Here we just remove the tree from the rb-tree, and the last |
| 494 | * kref holder will unlock and delete this refcount_tree. |
| 495 | * Then we goto "again" and ocfs2_get_refcount_tree will create |
| 496 | * the new refcount tree for us. |
| 497 | */ |
| 498 | if (tree->rf_generation != le32_to_cpu(rb->rf_generation)) { |
| 499 | if (!tree->rf_removed) { |
| 500 | ocfs2_erase_refcount_tree_from_list(osb, tree); |
| 501 | tree->rf_removed = 1; |
| 502 | delete_tree = 1; |
| 503 | } |
| 504 | |
| 505 | ocfs2_unlock_refcount_tree(osb, tree, rw); |
| 506 | /* |
| 507 | * We get an extra reference when we create the refcount |
| 508 | * tree, so another put will destroy it. |
| 509 | */ |
| 510 | if (delete_tree) |
| 511 | ocfs2_refcount_tree_put(tree); |
| 512 | brelse(ref_root_bh); |
| 513 | ref_root_bh = NULL; |
| 514 | goto again; |
| 515 | } |
| 516 | |
| 517 | *ret_tree = tree; |
| 518 | if (ref_bh) { |
| 519 | *ref_bh = ref_root_bh; |
| 520 | ref_root_bh = NULL; |
| 521 | } |
| 522 | out: |
| 523 | brelse(ref_root_bh); |
| 524 | return ret; |
| 525 | } |
| 526 | |
| 527 | int ocfs2_lock_refcount_tree_by_inode(struct inode *inode, int rw, |
| 528 | struct ocfs2_refcount_tree **ret_tree, |
| 529 | struct buffer_head **ref_bh) |
| 530 | { |
| 531 | int ret; |
| 532 | u64 ref_blkno; |
| 533 | |
| 534 | ret = ocfs2_get_refcount_block(inode, &ref_blkno); |
| 535 | if (ret) { |
| 536 | mlog_errno(ret); |
| 537 | return ret; |
| 538 | } |
| 539 | |
| 540 | return ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, |
| 541 | rw, ret_tree, ref_bh); |
| 542 | } |
| 543 | |
| 544 | void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb, |
| 545 | struct ocfs2_refcount_tree *tree, int rw) |
| 546 | { |
| 547 | if (rw) |
| 548 | up_write(&tree->rf_sem); |
| 549 | else |
| 550 | up_read(&tree->rf_sem); |
| 551 | |
| 552 | ocfs2_refcount_unlock(tree, rw); |
| 553 | ocfs2_refcount_tree_put(tree); |
| 554 | } |
| 555 | |
| 556 | void ocfs2_purge_refcount_trees(struct ocfs2_super *osb) |
| 557 | { |
| 558 | struct rb_node *node; |
| 559 | struct ocfs2_refcount_tree *tree; |
| 560 | struct rb_root *root = &osb->osb_rf_lock_tree; |
| 561 | |
| 562 | while ((node = rb_last(root)) != NULL) { |
| 563 | tree = rb_entry(node, struct ocfs2_refcount_tree, rf_node); |
| 564 | |
| 565 | mlog(0, "Purge tree %llu\n", |
| 566 | (unsigned long long) tree->rf_blkno); |
| 567 | |
| 568 | rb_erase(&tree->rf_node, root); |
| 569 | ocfs2_free_refcount_tree(tree); |
| 570 | } |
| 571 | } |
Tao Ma | 8bf396d | 2009-08-24 11:12:02 +0800 | [diff] [blame] | 572 | |
| 573 | /* |
| 574 | * Create a refcount tree for an inode. |
| 575 | * We take for granted that the inode is already locked. |
| 576 | */ |
| 577 | static int ocfs2_create_refcount_tree(struct inode *inode, |
| 578 | struct buffer_head *di_bh) |
| 579 | { |
| 580 | int ret; |
| 581 | handle_t *handle = NULL; |
| 582 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 583 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 584 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 585 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 586 | struct buffer_head *new_bh = NULL; |
| 587 | struct ocfs2_refcount_block *rb; |
| 588 | struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL; |
| 589 | u16 suballoc_bit_start; |
| 590 | u32 num_got; |
| 591 | u64 first_blkno; |
| 592 | |
| 593 | BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL); |
| 594 | |
| 595 | mlog(0, "create tree for inode %lu\n", inode->i_ino); |
| 596 | |
| 597 | ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); |
| 598 | if (ret) { |
| 599 | mlog_errno(ret); |
| 600 | goto out; |
| 601 | } |
| 602 | |
| 603 | handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_CREATE_CREDITS); |
| 604 | if (IS_ERR(handle)) { |
| 605 | ret = PTR_ERR(handle); |
| 606 | mlog_errno(ret); |
| 607 | goto out; |
| 608 | } |
| 609 | |
| 610 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, |
| 611 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 612 | if (ret) { |
| 613 | mlog_errno(ret); |
| 614 | goto out_commit; |
| 615 | } |
| 616 | |
| 617 | ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1, |
| 618 | &suballoc_bit_start, &num_got, |
| 619 | &first_blkno); |
| 620 | if (ret) { |
| 621 | mlog_errno(ret); |
| 622 | goto out_commit; |
| 623 | } |
| 624 | |
| 625 | new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno); |
| 626 | if (!new_tree) { |
| 627 | ret = -ENOMEM; |
| 628 | mlog_errno(ret); |
| 629 | goto out_commit; |
| 630 | } |
| 631 | |
| 632 | new_bh = sb_getblk(inode->i_sb, first_blkno); |
| 633 | ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh); |
| 634 | |
| 635 | ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh, |
| 636 | OCFS2_JOURNAL_ACCESS_CREATE); |
| 637 | if (ret) { |
| 638 | mlog_errno(ret); |
| 639 | goto out_commit; |
| 640 | } |
| 641 | |
| 642 | /* Initialize ocfs2_refcount_block. */ |
| 643 | rb = (struct ocfs2_refcount_block *)new_bh->b_data; |
| 644 | memset(rb, 0, inode->i_sb->s_blocksize); |
| 645 | strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE); |
| 646 | rb->rf_suballoc_slot = cpu_to_le16(osb->slot_num); |
| 647 | rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start); |
| 648 | rb->rf_fs_generation = cpu_to_le32(osb->fs_generation); |
| 649 | rb->rf_blkno = cpu_to_le64(first_blkno); |
| 650 | rb->rf_count = cpu_to_le32(1); |
| 651 | rb->rf_records.rl_count = |
| 652 | cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb)); |
| 653 | spin_lock(&osb->osb_lock); |
| 654 | rb->rf_generation = osb->s_next_generation++; |
| 655 | spin_unlock(&osb->osb_lock); |
| 656 | |
| 657 | ocfs2_journal_dirty(handle, new_bh); |
| 658 | |
| 659 | spin_lock(&oi->ip_lock); |
| 660 | oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL; |
| 661 | di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); |
| 662 | di->i_refcount_loc = cpu_to_le64(first_blkno); |
| 663 | spin_unlock(&oi->ip_lock); |
| 664 | |
| 665 | mlog(0, "created tree for inode %lu, refblock %llu\n", |
| 666 | inode->i_ino, (unsigned long long)first_blkno); |
| 667 | |
| 668 | ocfs2_journal_dirty(handle, di_bh); |
| 669 | |
| 670 | /* |
| 671 | * We have to init the tree lock here since it will use |
| 672 | * the generation number to create it. |
| 673 | */ |
| 674 | new_tree->rf_generation = le32_to_cpu(rb->rf_generation); |
| 675 | ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno, |
| 676 | new_tree->rf_generation); |
| 677 | |
| 678 | spin_lock(&osb->osb_lock); |
| 679 | tree = ocfs2_find_refcount_tree(osb, first_blkno); |
| 680 | |
| 681 | /* |
| 682 | * We've just created a new refcount tree in this block. If |
| 683 | * we found a refcount tree on the ocfs2_super, it must be |
| 684 | * one we just deleted. We free the old tree before |
| 685 | * inserting the new tree. |
| 686 | */ |
| 687 | BUG_ON(tree && tree->rf_generation == new_tree->rf_generation); |
| 688 | if (tree) |
| 689 | ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree); |
| 690 | ocfs2_insert_refcount_tree(osb, new_tree); |
| 691 | spin_unlock(&osb->osb_lock); |
| 692 | new_tree = NULL; |
| 693 | if (tree) |
| 694 | ocfs2_refcount_tree_put(tree); |
| 695 | |
| 696 | out_commit: |
| 697 | ocfs2_commit_trans(osb, handle); |
| 698 | |
| 699 | out: |
| 700 | if (new_tree) { |
| 701 | ocfs2_metadata_cache_exit(&new_tree->rf_ci); |
| 702 | kfree(new_tree); |
| 703 | } |
| 704 | |
| 705 | brelse(new_bh); |
| 706 | if (meta_ac) |
| 707 | ocfs2_free_alloc_context(meta_ac); |
| 708 | |
| 709 | return ret; |
| 710 | } |
| 711 | |
| 712 | static int ocfs2_set_refcount_tree(struct inode *inode, |
| 713 | struct buffer_head *di_bh, |
| 714 | u64 refcount_loc) |
| 715 | { |
| 716 | int ret; |
| 717 | handle_t *handle = NULL; |
| 718 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 719 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 720 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 721 | struct buffer_head *ref_root_bh = NULL; |
| 722 | struct ocfs2_refcount_block *rb; |
| 723 | struct ocfs2_refcount_tree *ref_tree; |
| 724 | |
| 725 | BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL); |
| 726 | |
| 727 | ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1, |
| 728 | &ref_tree, &ref_root_bh); |
| 729 | if (ret) { |
| 730 | mlog_errno(ret); |
| 731 | return ret; |
| 732 | } |
| 733 | |
| 734 | handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS); |
| 735 | if (IS_ERR(handle)) { |
| 736 | ret = PTR_ERR(handle); |
| 737 | mlog_errno(ret); |
| 738 | goto out; |
| 739 | } |
| 740 | |
| 741 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, |
| 742 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 743 | if (ret) { |
| 744 | mlog_errno(ret); |
| 745 | goto out_commit; |
| 746 | } |
| 747 | |
| 748 | ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh, |
| 749 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 750 | if (ret) { |
| 751 | mlog_errno(ret); |
| 752 | goto out_commit; |
| 753 | } |
| 754 | |
| 755 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; |
| 756 | le32_add_cpu(&rb->rf_count, 1); |
| 757 | |
| 758 | ocfs2_journal_dirty(handle, ref_root_bh); |
| 759 | |
| 760 | spin_lock(&oi->ip_lock); |
| 761 | oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL; |
| 762 | di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); |
| 763 | di->i_refcount_loc = cpu_to_le64(refcount_loc); |
| 764 | spin_unlock(&oi->ip_lock); |
| 765 | ocfs2_journal_dirty(handle, di_bh); |
| 766 | |
| 767 | out_commit: |
| 768 | ocfs2_commit_trans(osb, handle); |
| 769 | out: |
| 770 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); |
| 771 | brelse(ref_root_bh); |
| 772 | |
| 773 | return ret; |
| 774 | } |
| 775 | |
| 776 | int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh) |
| 777 | { |
| 778 | int ret, delete_tree = 0; |
| 779 | handle_t *handle = NULL; |
| 780 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 781 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 782 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 783 | struct ocfs2_refcount_block *rb; |
| 784 | struct inode *alloc_inode = NULL; |
| 785 | struct buffer_head *alloc_bh = NULL; |
| 786 | struct buffer_head *blk_bh = NULL; |
| 787 | struct ocfs2_refcount_tree *ref_tree; |
| 788 | int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS; |
| 789 | u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc); |
| 790 | u16 bit = 0; |
| 791 | |
| 792 | if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) |
| 793 | return 0; |
| 794 | |
| 795 | BUG_ON(!ref_blkno); |
| 796 | ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh); |
| 797 | if (ret) { |
| 798 | mlog_errno(ret); |
| 799 | return ret; |
| 800 | } |
| 801 | |
| 802 | rb = (struct ocfs2_refcount_block *)blk_bh->b_data; |
| 803 | |
| 804 | /* |
| 805 | * If we are the last user, we need to free the block. |
| 806 | * So lock the allocator ahead. |
| 807 | */ |
| 808 | if (le32_to_cpu(rb->rf_count) == 1) { |
| 809 | blk = le64_to_cpu(rb->rf_blkno); |
| 810 | bit = le16_to_cpu(rb->rf_suballoc_bit); |
| 811 | bg_blkno = ocfs2_which_suballoc_group(blk, bit); |
| 812 | |
| 813 | alloc_inode = ocfs2_get_system_file_inode(osb, |
| 814 | EXTENT_ALLOC_SYSTEM_INODE, |
| 815 | le16_to_cpu(rb->rf_suballoc_slot)); |
| 816 | if (!alloc_inode) { |
| 817 | ret = -ENOMEM; |
| 818 | mlog_errno(ret); |
| 819 | goto out; |
| 820 | } |
| 821 | mutex_lock(&alloc_inode->i_mutex); |
| 822 | |
| 823 | ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1); |
| 824 | if (ret) { |
| 825 | mlog_errno(ret); |
| 826 | goto out_mutex; |
| 827 | } |
| 828 | |
| 829 | credits += OCFS2_SUBALLOC_FREE; |
| 830 | } |
| 831 | |
| 832 | handle = ocfs2_start_trans(osb, credits); |
| 833 | if (IS_ERR(handle)) { |
| 834 | ret = PTR_ERR(handle); |
| 835 | mlog_errno(ret); |
| 836 | goto out_unlock; |
| 837 | } |
| 838 | |
| 839 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, |
| 840 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 841 | if (ret) { |
| 842 | mlog_errno(ret); |
| 843 | goto out_commit; |
| 844 | } |
| 845 | |
| 846 | ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh, |
| 847 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 848 | if (ret) { |
| 849 | mlog_errno(ret); |
| 850 | goto out_commit; |
| 851 | } |
| 852 | |
| 853 | spin_lock(&oi->ip_lock); |
| 854 | oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL; |
| 855 | di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); |
| 856 | di->i_refcount_loc = 0; |
| 857 | spin_unlock(&oi->ip_lock); |
| 858 | ocfs2_journal_dirty(handle, di_bh); |
| 859 | |
| 860 | le32_add_cpu(&rb->rf_count , -1); |
| 861 | ocfs2_journal_dirty(handle, blk_bh); |
| 862 | |
| 863 | if (!rb->rf_count) { |
| 864 | delete_tree = 1; |
| 865 | ocfs2_erase_refcount_tree_from_list(osb, ref_tree); |
| 866 | ret = ocfs2_free_suballoc_bits(handle, alloc_inode, |
| 867 | alloc_bh, bit, bg_blkno, 1); |
| 868 | if (ret) |
| 869 | mlog_errno(ret); |
| 870 | } |
| 871 | |
| 872 | out_commit: |
| 873 | ocfs2_commit_trans(osb, handle); |
| 874 | out_unlock: |
| 875 | if (alloc_inode) { |
| 876 | ocfs2_inode_unlock(alloc_inode, 1); |
| 877 | brelse(alloc_bh); |
| 878 | } |
| 879 | out_mutex: |
| 880 | if (alloc_inode) { |
| 881 | mutex_unlock(&alloc_inode->i_mutex); |
| 882 | iput(alloc_inode); |
| 883 | } |
| 884 | out: |
| 885 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); |
| 886 | if (delete_tree) |
| 887 | ocfs2_refcount_tree_put(ref_tree); |
| 888 | brelse(blk_bh); |
| 889 | |
| 890 | return ret; |
| 891 | } |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 892 | |
| 893 | static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci, |
| 894 | struct buffer_head *ref_leaf_bh, |
| 895 | u64 cpos, unsigned int len, |
| 896 | struct ocfs2_refcount_rec *ret_rec, |
| 897 | int *index) |
| 898 | { |
| 899 | int i = 0; |
| 900 | struct ocfs2_refcount_block *rb = |
| 901 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
| 902 | struct ocfs2_refcount_rec *rec = NULL; |
| 903 | |
| 904 | for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) { |
| 905 | rec = &rb->rf_records.rl_recs[i]; |
| 906 | |
| 907 | if (le64_to_cpu(rec->r_cpos) + |
| 908 | le32_to_cpu(rec->r_clusters) <= cpos) |
| 909 | continue; |
| 910 | else if (le64_to_cpu(rec->r_cpos) > cpos) |
| 911 | break; |
| 912 | |
| 913 | /* ok, cpos fail in this rec. Just return. */ |
| 914 | if (ret_rec) |
| 915 | *ret_rec = *rec; |
| 916 | goto out; |
| 917 | } |
| 918 | |
| 919 | if (ret_rec) { |
| 920 | /* We meet with a hole here, so fake the rec. */ |
| 921 | ret_rec->r_cpos = cpu_to_le64(cpos); |
| 922 | ret_rec->r_refcount = 0; |
| 923 | if (i < le16_to_cpu(rb->rf_records.rl_used) && |
| 924 | le64_to_cpu(rec->r_cpos) < cpos + len) |
| 925 | ret_rec->r_clusters = |
| 926 | cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos); |
| 927 | else |
| 928 | ret_rec->r_clusters = cpu_to_le32(len); |
| 929 | } |
| 930 | |
| 931 | out: |
| 932 | *index = i; |
| 933 | } |
| 934 | |
| 935 | /* |
Tao Ma | 8b2c0db | 2009-08-18 11:43:49 +0800 | [diff] [blame] | 936 | * Try to remove refcount tree. The mechanism is: |
| 937 | * 1) Check whether i_clusters == 0, if no, exit. |
| 938 | * 2) check whether we have i_xattr_loc in dinode. if yes, exit. |
| 939 | * 3) Check whether we have inline xattr stored outside, if yes, exit. |
| 940 | * 4) Remove the tree. |
| 941 | */ |
| 942 | int ocfs2_try_remove_refcount_tree(struct inode *inode, |
| 943 | struct buffer_head *di_bh) |
| 944 | { |
| 945 | int ret; |
| 946 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 947 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 948 | |
| 949 | down_write(&oi->ip_xattr_sem); |
| 950 | down_write(&oi->ip_alloc_sem); |
| 951 | |
| 952 | if (oi->ip_clusters) |
| 953 | goto out; |
| 954 | |
| 955 | if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc) |
| 956 | goto out; |
| 957 | |
| 958 | if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL && |
| 959 | ocfs2_has_inline_xattr_value_outside(inode, di)) |
| 960 | goto out; |
| 961 | |
| 962 | ret = ocfs2_remove_refcount_tree(inode, di_bh); |
| 963 | if (ret) |
| 964 | mlog_errno(ret); |
| 965 | out: |
| 966 | up_write(&oi->ip_alloc_sem); |
| 967 | up_write(&oi->ip_xattr_sem); |
| 968 | return 0; |
| 969 | } |
| 970 | |
| 971 | /* |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 972 | * Given a cpos and len, try to find the refcount record which contains cpos. |
| 973 | * 1. If cpos can be found in one refcount record, return the record. |
| 974 | * 2. If cpos can't be found, return a fake record which start from cpos |
| 975 | * and end at a small value between cpos+len and start of the next record. |
| 976 | * This fake record has r_refcount = 0. |
| 977 | */ |
| 978 | static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci, |
| 979 | struct buffer_head *ref_root_bh, |
| 980 | u64 cpos, unsigned int len, |
| 981 | struct ocfs2_refcount_rec *ret_rec, |
| 982 | int *index, |
| 983 | struct buffer_head **ret_bh) |
| 984 | { |
| 985 | int ret = 0, i, found; |
| 986 | u32 low_cpos; |
| 987 | struct ocfs2_extent_list *el; |
| 988 | struct ocfs2_extent_rec *tmp, *rec = NULL; |
| 989 | struct ocfs2_extent_block *eb; |
| 990 | struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL; |
| 991 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); |
| 992 | struct ocfs2_refcount_block *rb = |
| 993 | (struct ocfs2_refcount_block *)ref_root_bh->b_data; |
| 994 | |
| 995 | if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) { |
| 996 | ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len, |
| 997 | ret_rec, index); |
| 998 | *ret_bh = ref_root_bh; |
| 999 | get_bh(ref_root_bh); |
| 1000 | return 0; |
| 1001 | } |
| 1002 | |
| 1003 | el = &rb->rf_list; |
| 1004 | low_cpos = cpos & OCFS2_32BIT_POS_MASK; |
| 1005 | |
| 1006 | if (el->l_tree_depth) { |
| 1007 | ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh); |
| 1008 | if (ret) { |
| 1009 | mlog_errno(ret); |
| 1010 | goto out; |
| 1011 | } |
| 1012 | |
| 1013 | eb = (struct ocfs2_extent_block *) eb_bh->b_data; |
| 1014 | el = &eb->h_list; |
| 1015 | |
| 1016 | if (el->l_tree_depth) { |
| 1017 | ocfs2_error(sb, |
| 1018 | "refcount tree %llu has non zero tree " |
| 1019 | "depth in leaf btree tree block %llu\n", |
| 1020 | (unsigned long long)ocfs2_metadata_cache_owner(ci), |
| 1021 | (unsigned long long)eb_bh->b_blocknr); |
| 1022 | ret = -EROFS; |
| 1023 | goto out; |
| 1024 | } |
| 1025 | } |
| 1026 | |
| 1027 | found = 0; |
| 1028 | for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { |
| 1029 | rec = &el->l_recs[i]; |
| 1030 | |
| 1031 | if (le32_to_cpu(rec->e_cpos) <= low_cpos) { |
| 1032 | found = 1; |
| 1033 | break; |
| 1034 | } |
| 1035 | } |
| 1036 | |
| 1037 | /* adjust len when we have ocfs2_extent_rec after it. */ |
| 1038 | if (found && i < le16_to_cpu(el->l_next_free_rec) - 1) { |
| 1039 | tmp = &el->l_recs[i+1]; |
| 1040 | |
| 1041 | if (le32_to_cpu(tmp->e_cpos) < cpos + len) |
| 1042 | len = le32_to_cpu(tmp->e_cpos) - cpos; |
| 1043 | } |
| 1044 | |
| 1045 | ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno), |
| 1046 | &ref_leaf_bh); |
| 1047 | if (ret) { |
| 1048 | mlog_errno(ret); |
| 1049 | goto out; |
| 1050 | } |
| 1051 | |
| 1052 | ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len, |
| 1053 | ret_rec, index); |
| 1054 | *ret_bh = ref_leaf_bh; |
| 1055 | out: |
| 1056 | brelse(eb_bh); |
| 1057 | return ret; |
| 1058 | } |
| 1059 | |
| 1060 | enum ocfs2_ref_rec_contig { |
| 1061 | REF_CONTIG_NONE = 0, |
| 1062 | REF_CONTIG_LEFT, |
| 1063 | REF_CONTIG_RIGHT, |
| 1064 | REF_CONTIG_LEFTRIGHT, |
| 1065 | }; |
| 1066 | |
| 1067 | static enum ocfs2_ref_rec_contig |
| 1068 | ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb, |
| 1069 | int index) |
| 1070 | { |
| 1071 | if ((rb->rf_records.rl_recs[index].r_refcount == |
| 1072 | rb->rf_records.rl_recs[index + 1].r_refcount) && |
| 1073 | (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) + |
| 1074 | le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) == |
| 1075 | le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos))) |
| 1076 | return REF_CONTIG_RIGHT; |
| 1077 | |
| 1078 | return REF_CONTIG_NONE; |
| 1079 | } |
| 1080 | |
| 1081 | static enum ocfs2_ref_rec_contig |
| 1082 | ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb, |
| 1083 | int index) |
| 1084 | { |
| 1085 | enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE; |
| 1086 | |
| 1087 | if (index < le16_to_cpu(rb->rf_records.rl_used) - 1) |
| 1088 | ret = ocfs2_refcount_rec_adjacent(rb, index); |
| 1089 | |
| 1090 | if (index > 0) { |
| 1091 | enum ocfs2_ref_rec_contig tmp; |
| 1092 | |
| 1093 | tmp = ocfs2_refcount_rec_adjacent(rb, index - 1); |
| 1094 | |
| 1095 | if (tmp == REF_CONTIG_RIGHT) { |
| 1096 | if (ret == REF_CONTIG_RIGHT) |
| 1097 | ret = REF_CONTIG_LEFTRIGHT; |
| 1098 | else |
| 1099 | ret = REF_CONTIG_LEFT; |
| 1100 | } |
| 1101 | } |
| 1102 | |
| 1103 | return ret; |
| 1104 | } |
| 1105 | |
| 1106 | static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb, |
| 1107 | int index) |
| 1108 | { |
| 1109 | BUG_ON(rb->rf_records.rl_recs[index].r_refcount != |
| 1110 | rb->rf_records.rl_recs[index+1].r_refcount); |
| 1111 | |
| 1112 | le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters, |
| 1113 | le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters)); |
| 1114 | |
| 1115 | if (index < le16_to_cpu(rb->rf_records.rl_used) - 2) |
| 1116 | memmove(&rb->rf_records.rl_recs[index + 1], |
| 1117 | &rb->rf_records.rl_recs[index + 2], |
| 1118 | sizeof(struct ocfs2_refcount_rec) * |
| 1119 | (le16_to_cpu(rb->rf_records.rl_used) - index - 2)); |
| 1120 | |
| 1121 | memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1], |
| 1122 | 0, sizeof(struct ocfs2_refcount_rec)); |
| 1123 | le16_add_cpu(&rb->rf_records.rl_used, -1); |
| 1124 | } |
| 1125 | |
| 1126 | /* |
| 1127 | * Merge the refcount rec if we are contiguous with the adjacent recs. |
| 1128 | */ |
| 1129 | static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb, |
| 1130 | int index) |
| 1131 | { |
| 1132 | enum ocfs2_ref_rec_contig contig = |
| 1133 | ocfs2_refcount_rec_contig(rb, index); |
| 1134 | |
| 1135 | if (contig == REF_CONTIG_NONE) |
| 1136 | return; |
| 1137 | |
| 1138 | if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) { |
| 1139 | BUG_ON(index == 0); |
| 1140 | index--; |
| 1141 | } |
| 1142 | |
| 1143 | ocfs2_rotate_refcount_rec_left(rb, index); |
| 1144 | |
| 1145 | if (contig == REF_CONTIG_LEFTRIGHT) |
| 1146 | ocfs2_rotate_refcount_rec_left(rb, index); |
| 1147 | } |
| 1148 | |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 1149 | /* |
| 1150 | * Change the refcount indexed by "index" in ref_bh. |
| 1151 | * If refcount reaches 0, remove it. |
| 1152 | */ |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1153 | static int ocfs2_change_refcount_rec(handle_t *handle, |
| 1154 | struct ocfs2_caching_info *ci, |
| 1155 | struct buffer_head *ref_leaf_bh, |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 1156 | int index, int merge, int change) |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1157 | { |
| 1158 | int ret; |
| 1159 | struct ocfs2_refcount_block *rb = |
| 1160 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 1161 | struct ocfs2_refcount_list *rl = &rb->rf_records; |
| 1162 | struct ocfs2_refcount_rec *rec = &rl->rl_recs[index]; |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1163 | |
| 1164 | ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, |
| 1165 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1166 | if (ret) { |
| 1167 | mlog_errno(ret); |
| 1168 | goto out; |
| 1169 | } |
| 1170 | |
| 1171 | mlog(0, "change index %d, old count %u, change %d\n", index, |
| 1172 | le32_to_cpu(rec->r_refcount), change); |
| 1173 | le32_add_cpu(&rec->r_refcount, change); |
| 1174 | |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 1175 | if (!rec->r_refcount) { |
| 1176 | if (index != le16_to_cpu(rl->rl_used) - 1) { |
| 1177 | memmove(rec, rec + 1, |
| 1178 | (le16_to_cpu(rl->rl_used) - index - 1) * |
| 1179 | sizeof(struct ocfs2_refcount_rec)); |
| 1180 | memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1], |
| 1181 | 0, sizeof(struct ocfs2_refcount_rec)); |
| 1182 | } |
| 1183 | |
| 1184 | le16_add_cpu(&rl->rl_used, -1); |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 1185 | } else if (merge) |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 1186 | ocfs2_refcount_rec_merge(rb, index); |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1187 | |
| 1188 | ret = ocfs2_journal_dirty(handle, ref_leaf_bh); |
| 1189 | if (ret) |
| 1190 | mlog_errno(ret); |
| 1191 | out: |
| 1192 | return ret; |
| 1193 | } |
| 1194 | |
| 1195 | static int ocfs2_expand_inline_ref_root(handle_t *handle, |
| 1196 | struct ocfs2_caching_info *ci, |
| 1197 | struct buffer_head *ref_root_bh, |
| 1198 | struct buffer_head **ref_leaf_bh, |
| 1199 | struct ocfs2_alloc_context *meta_ac) |
| 1200 | { |
| 1201 | int ret; |
| 1202 | u16 suballoc_bit_start; |
| 1203 | u32 num_got; |
| 1204 | u64 blkno; |
| 1205 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); |
| 1206 | struct buffer_head *new_bh = NULL; |
| 1207 | struct ocfs2_refcount_block *new_rb; |
| 1208 | struct ocfs2_refcount_block *root_rb = |
| 1209 | (struct ocfs2_refcount_block *)ref_root_bh->b_data; |
| 1210 | |
| 1211 | ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh, |
| 1212 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1213 | if (ret) { |
| 1214 | mlog_errno(ret); |
| 1215 | goto out; |
| 1216 | } |
| 1217 | |
| 1218 | ret = ocfs2_claim_metadata(OCFS2_SB(sb), handle, meta_ac, 1, |
| 1219 | &suballoc_bit_start, &num_got, |
| 1220 | &blkno); |
| 1221 | if (ret) { |
| 1222 | mlog_errno(ret); |
| 1223 | goto out; |
| 1224 | } |
| 1225 | |
| 1226 | new_bh = sb_getblk(sb, blkno); |
| 1227 | if (new_bh == NULL) { |
| 1228 | ret = -EIO; |
| 1229 | mlog_errno(ret); |
| 1230 | goto out; |
| 1231 | } |
| 1232 | ocfs2_set_new_buffer_uptodate(ci, new_bh); |
| 1233 | |
| 1234 | ret = ocfs2_journal_access_rb(handle, ci, new_bh, |
| 1235 | OCFS2_JOURNAL_ACCESS_CREATE); |
| 1236 | if (ret) { |
| 1237 | mlog_errno(ret); |
| 1238 | goto out; |
| 1239 | } |
| 1240 | |
| 1241 | /* |
| 1242 | * Initialize ocfs2_refcount_block. |
| 1243 | * It should contain the same information as the old root. |
| 1244 | * so just memcpy it and change the corresponding field. |
| 1245 | */ |
| 1246 | memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize); |
| 1247 | |
| 1248 | new_rb = (struct ocfs2_refcount_block *)new_bh->b_data; |
| 1249 | new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num); |
| 1250 | new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start); |
| 1251 | new_rb->rf_blkno = cpu_to_le64(blkno); |
| 1252 | new_rb->rf_cpos = cpu_to_le32(0); |
| 1253 | new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr); |
| 1254 | new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL); |
| 1255 | ocfs2_journal_dirty(handle, new_bh); |
| 1256 | |
| 1257 | /* Now change the root. */ |
| 1258 | memset(&root_rb->rf_list, 0, sb->s_blocksize - |
| 1259 | offsetof(struct ocfs2_refcount_block, rf_list)); |
| 1260 | root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb)); |
| 1261 | root_rb->rf_clusters = cpu_to_le32(1); |
| 1262 | root_rb->rf_list.l_next_free_rec = cpu_to_le16(1); |
| 1263 | root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno); |
| 1264 | root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1); |
| 1265 | root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL); |
| 1266 | |
| 1267 | ocfs2_journal_dirty(handle, ref_root_bh); |
| 1268 | |
| 1269 | mlog(0, "new leaf block %llu, used %u\n", (unsigned long long)blkno, |
| 1270 | le16_to_cpu(new_rb->rf_records.rl_used)); |
| 1271 | |
| 1272 | *ref_leaf_bh = new_bh; |
| 1273 | new_bh = NULL; |
| 1274 | out: |
| 1275 | brelse(new_bh); |
| 1276 | return ret; |
| 1277 | } |
| 1278 | |
| 1279 | static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev, |
| 1280 | struct ocfs2_refcount_rec *next) |
| 1281 | { |
| 1282 | if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <= |
| 1283 | ocfs2_get_ref_rec_low_cpos(next)) |
| 1284 | return 1; |
| 1285 | |
| 1286 | return 0; |
| 1287 | } |
| 1288 | |
| 1289 | static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b) |
| 1290 | { |
| 1291 | const struct ocfs2_refcount_rec *l = a, *r = b; |
| 1292 | u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l); |
| 1293 | u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r); |
| 1294 | |
| 1295 | if (l_cpos > r_cpos) |
| 1296 | return 1; |
| 1297 | if (l_cpos < r_cpos) |
| 1298 | return -1; |
| 1299 | return 0; |
| 1300 | } |
| 1301 | |
| 1302 | static int cmp_refcount_rec_by_cpos(const void *a, const void *b) |
| 1303 | { |
| 1304 | const struct ocfs2_refcount_rec *l = a, *r = b; |
| 1305 | u64 l_cpos = le64_to_cpu(l->r_cpos); |
| 1306 | u64 r_cpos = le64_to_cpu(r->r_cpos); |
| 1307 | |
| 1308 | if (l_cpos > r_cpos) |
| 1309 | return 1; |
| 1310 | if (l_cpos < r_cpos) |
| 1311 | return -1; |
| 1312 | return 0; |
| 1313 | } |
| 1314 | |
| 1315 | static void swap_refcount_rec(void *a, void *b, int size) |
| 1316 | { |
| 1317 | struct ocfs2_refcount_rec *l = a, *r = b, tmp; |
| 1318 | |
| 1319 | tmp = *(struct ocfs2_refcount_rec *)l; |
| 1320 | *(struct ocfs2_refcount_rec *)l = |
| 1321 | *(struct ocfs2_refcount_rec *)r; |
| 1322 | *(struct ocfs2_refcount_rec *)r = tmp; |
| 1323 | } |
| 1324 | |
| 1325 | /* |
| 1326 | * The refcount cpos are ordered by their 64bit cpos, |
| 1327 | * But we will use the low 32 bit to be the e_cpos in the b-tree. |
| 1328 | * So we need to make sure that this pos isn't intersected with others. |
| 1329 | * |
| 1330 | * Note: The refcount block is already sorted by their low 32 bit cpos, |
| 1331 | * So just try the middle pos first, and we will exit when we find |
| 1332 | * the good position. |
| 1333 | */ |
| 1334 | static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl, |
| 1335 | u32 *split_pos, int *split_index) |
| 1336 | { |
| 1337 | int num_used = le16_to_cpu(rl->rl_used); |
| 1338 | int delta, middle = num_used / 2; |
| 1339 | |
| 1340 | for (delta = 0; delta < middle; delta++) { |
| 1341 | /* Let's check delta earlier than middle */ |
| 1342 | if (ocfs2_refcount_rec_no_intersect( |
| 1343 | &rl->rl_recs[middle - delta - 1], |
| 1344 | &rl->rl_recs[middle - delta])) { |
| 1345 | *split_index = middle - delta; |
| 1346 | break; |
| 1347 | } |
| 1348 | |
| 1349 | /* For even counts, don't walk off the end */ |
| 1350 | if ((middle + delta + 1) == num_used) |
| 1351 | continue; |
| 1352 | |
| 1353 | /* Now try delta past middle */ |
| 1354 | if (ocfs2_refcount_rec_no_intersect( |
| 1355 | &rl->rl_recs[middle + delta], |
| 1356 | &rl->rl_recs[middle + delta + 1])) { |
| 1357 | *split_index = middle + delta + 1; |
| 1358 | break; |
| 1359 | } |
| 1360 | } |
| 1361 | |
| 1362 | if (delta >= middle) |
| 1363 | return -ENOSPC; |
| 1364 | |
| 1365 | *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]); |
| 1366 | return 0; |
| 1367 | } |
| 1368 | |
| 1369 | static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh, |
| 1370 | struct buffer_head *new_bh, |
| 1371 | u32 *split_cpos) |
| 1372 | { |
| 1373 | int split_index = 0, num_moved, ret; |
| 1374 | u32 cpos = 0; |
| 1375 | struct ocfs2_refcount_block *rb = |
| 1376 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
| 1377 | struct ocfs2_refcount_list *rl = &rb->rf_records; |
| 1378 | struct ocfs2_refcount_block *new_rb = |
| 1379 | (struct ocfs2_refcount_block *)new_bh->b_data; |
| 1380 | struct ocfs2_refcount_list *new_rl = &new_rb->rf_records; |
| 1381 | |
| 1382 | mlog(0, "split old leaf refcount block %llu, count = %u, used = %u\n", |
| 1383 | (unsigned long long)ref_leaf_bh->b_blocknr, |
| 1384 | le32_to_cpu(rl->rl_count), le32_to_cpu(rl->rl_used)); |
| 1385 | |
| 1386 | /* |
| 1387 | * XXX: Improvement later. |
| 1388 | * If we know all the high 32 bit cpos is the same, no need to sort. |
| 1389 | * |
| 1390 | * In order to make the whole process safe, we do: |
| 1391 | * 1. sort the entries by their low 32 bit cpos first so that we can |
| 1392 | * find the split cpos easily. |
| 1393 | * 2. call ocfs2_insert_extent to insert the new refcount block. |
| 1394 | * 3. move the refcount rec to the new block. |
| 1395 | * 4. sort the entries by their 64 bit cpos. |
| 1396 | * 5. dirty the new_rb and rb. |
| 1397 | */ |
| 1398 | sort(&rl->rl_recs, le16_to_cpu(rl->rl_used), |
| 1399 | sizeof(struct ocfs2_refcount_rec), |
| 1400 | cmp_refcount_rec_by_low_cpos, swap_refcount_rec); |
| 1401 | |
| 1402 | ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index); |
| 1403 | if (ret) { |
| 1404 | mlog_errno(ret); |
| 1405 | return ret; |
| 1406 | } |
| 1407 | |
| 1408 | new_rb->rf_cpos = cpu_to_le32(cpos); |
| 1409 | |
| 1410 | /* move refcount records starting from split_index to the new block. */ |
| 1411 | num_moved = le16_to_cpu(rl->rl_used) - split_index; |
| 1412 | memcpy(new_rl->rl_recs, &rl->rl_recs[split_index], |
| 1413 | num_moved * sizeof(struct ocfs2_refcount_rec)); |
| 1414 | |
| 1415 | /*ok, remove the entries we just moved over to the other block. */ |
| 1416 | memset(&rl->rl_recs[split_index], 0, |
| 1417 | num_moved * sizeof(struct ocfs2_refcount_rec)); |
| 1418 | |
| 1419 | /* change old and new rl_used accordingly. */ |
| 1420 | le16_add_cpu(&rl->rl_used, -num_moved); |
| 1421 | new_rl->rl_used = cpu_to_le32(num_moved); |
| 1422 | |
| 1423 | sort(&rl->rl_recs, le16_to_cpu(rl->rl_used), |
| 1424 | sizeof(struct ocfs2_refcount_rec), |
| 1425 | cmp_refcount_rec_by_cpos, swap_refcount_rec); |
| 1426 | |
| 1427 | sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used), |
| 1428 | sizeof(struct ocfs2_refcount_rec), |
| 1429 | cmp_refcount_rec_by_cpos, swap_refcount_rec); |
| 1430 | |
| 1431 | *split_cpos = cpos; |
| 1432 | return 0; |
| 1433 | } |
| 1434 | |
| 1435 | static int ocfs2_new_leaf_refcount_block(handle_t *handle, |
| 1436 | struct ocfs2_caching_info *ci, |
| 1437 | struct buffer_head *ref_root_bh, |
| 1438 | struct buffer_head *ref_leaf_bh, |
| 1439 | struct ocfs2_alloc_context *meta_ac) |
| 1440 | { |
| 1441 | int ret; |
| 1442 | u16 suballoc_bit_start; |
| 1443 | u32 num_got, new_cpos; |
| 1444 | u64 blkno; |
| 1445 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); |
| 1446 | struct ocfs2_refcount_block *root_rb = |
| 1447 | (struct ocfs2_refcount_block *)ref_root_bh->b_data; |
| 1448 | struct buffer_head *new_bh = NULL; |
| 1449 | struct ocfs2_refcount_block *new_rb; |
| 1450 | struct ocfs2_extent_tree ref_et; |
| 1451 | |
| 1452 | BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)); |
| 1453 | |
| 1454 | ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh, |
| 1455 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1456 | if (ret) { |
| 1457 | mlog_errno(ret); |
| 1458 | goto out; |
| 1459 | } |
| 1460 | |
| 1461 | ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, |
| 1462 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1463 | if (ret) { |
| 1464 | mlog_errno(ret); |
| 1465 | goto out; |
| 1466 | } |
| 1467 | |
| 1468 | ret = ocfs2_claim_metadata(OCFS2_SB(sb), handle, meta_ac, 1, |
| 1469 | &suballoc_bit_start, &num_got, |
| 1470 | &blkno); |
| 1471 | if (ret) { |
| 1472 | mlog_errno(ret); |
| 1473 | goto out; |
| 1474 | } |
| 1475 | |
| 1476 | new_bh = sb_getblk(sb, blkno); |
| 1477 | if (new_bh == NULL) { |
| 1478 | ret = -EIO; |
| 1479 | mlog_errno(ret); |
| 1480 | goto out; |
| 1481 | } |
| 1482 | ocfs2_set_new_buffer_uptodate(ci, new_bh); |
| 1483 | |
| 1484 | ret = ocfs2_journal_access_rb(handle, ci, new_bh, |
| 1485 | OCFS2_JOURNAL_ACCESS_CREATE); |
| 1486 | if (ret) { |
| 1487 | mlog_errno(ret); |
| 1488 | goto out; |
| 1489 | } |
| 1490 | |
| 1491 | /* Initialize ocfs2_refcount_block. */ |
| 1492 | new_rb = (struct ocfs2_refcount_block *)new_bh->b_data; |
| 1493 | memset(new_rb, 0, sb->s_blocksize); |
| 1494 | strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE); |
| 1495 | new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num); |
| 1496 | new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start); |
| 1497 | new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation); |
| 1498 | new_rb->rf_blkno = cpu_to_le64(blkno); |
| 1499 | new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr); |
| 1500 | new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL); |
| 1501 | new_rb->rf_records.rl_count = |
| 1502 | cpu_to_le16(ocfs2_refcount_recs_per_rb(sb)); |
| 1503 | new_rb->rf_generation = root_rb->rf_generation; |
| 1504 | |
| 1505 | ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos); |
| 1506 | if (ret) { |
| 1507 | mlog_errno(ret); |
| 1508 | goto out; |
| 1509 | } |
| 1510 | |
| 1511 | ocfs2_journal_dirty(handle, ref_leaf_bh); |
| 1512 | ocfs2_journal_dirty(handle, new_bh); |
| 1513 | |
| 1514 | ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh); |
| 1515 | |
| 1516 | mlog(0, "insert new leaf block %llu at %u\n", |
| 1517 | (unsigned long long)new_bh->b_blocknr, new_cpos); |
| 1518 | |
| 1519 | /* Insert the new leaf block with the specific offset cpos. */ |
| 1520 | ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr, |
| 1521 | 1, 0, meta_ac); |
| 1522 | if (ret) |
| 1523 | mlog_errno(ret); |
| 1524 | |
| 1525 | out: |
| 1526 | brelse(new_bh); |
| 1527 | return ret; |
| 1528 | } |
| 1529 | |
| 1530 | static int ocfs2_expand_refcount_tree(handle_t *handle, |
| 1531 | struct ocfs2_caching_info *ci, |
| 1532 | struct buffer_head *ref_root_bh, |
| 1533 | struct buffer_head *ref_leaf_bh, |
| 1534 | struct ocfs2_alloc_context *meta_ac) |
| 1535 | { |
| 1536 | int ret; |
| 1537 | struct buffer_head *expand_bh = NULL; |
| 1538 | |
| 1539 | if (ref_root_bh == ref_leaf_bh) { |
| 1540 | /* |
| 1541 | * the old root bh hasn't been expanded to a b-tree, |
| 1542 | * so expand it first. |
| 1543 | */ |
| 1544 | ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh, |
| 1545 | &expand_bh, meta_ac); |
| 1546 | if (ret) { |
| 1547 | mlog_errno(ret); |
| 1548 | goto out; |
| 1549 | } |
| 1550 | } else { |
| 1551 | expand_bh = ref_leaf_bh; |
| 1552 | get_bh(expand_bh); |
| 1553 | } |
| 1554 | |
| 1555 | |
| 1556 | /* Now add a new refcount block into the tree.*/ |
| 1557 | ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh, |
| 1558 | expand_bh, meta_ac); |
| 1559 | if (ret) |
| 1560 | mlog_errno(ret); |
| 1561 | out: |
| 1562 | brelse(expand_bh); |
| 1563 | return ret; |
| 1564 | } |
| 1565 | |
| 1566 | /* |
| 1567 | * Adjust the extent rec in b-tree representing ref_leaf_bh. |
| 1568 | * |
| 1569 | * Only called when we have inserted a new refcount rec at index 0 |
| 1570 | * which means ocfs2_extent_rec.e_cpos may need some change. |
| 1571 | */ |
| 1572 | static int ocfs2_adjust_refcount_rec(handle_t *handle, |
| 1573 | struct ocfs2_caching_info *ci, |
| 1574 | struct buffer_head *ref_root_bh, |
| 1575 | struct buffer_head *ref_leaf_bh, |
| 1576 | struct ocfs2_refcount_rec *rec) |
| 1577 | { |
| 1578 | int ret = 0, i; |
| 1579 | u32 new_cpos, old_cpos; |
| 1580 | struct ocfs2_path *path = NULL; |
| 1581 | struct ocfs2_extent_tree et; |
| 1582 | struct ocfs2_refcount_block *rb = |
| 1583 | (struct ocfs2_refcount_block *)ref_root_bh->b_data; |
| 1584 | struct ocfs2_extent_list *el; |
| 1585 | |
| 1586 | if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) |
| 1587 | goto out; |
| 1588 | |
| 1589 | rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
| 1590 | old_cpos = le32_to_cpu(rb->rf_cpos); |
| 1591 | new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK; |
| 1592 | if (old_cpos <= new_cpos) |
| 1593 | goto out; |
| 1594 | |
| 1595 | ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh); |
| 1596 | |
| 1597 | path = ocfs2_new_path_from_et(&et); |
| 1598 | if (!path) { |
| 1599 | ret = -ENOMEM; |
| 1600 | mlog_errno(ret); |
| 1601 | goto out; |
| 1602 | } |
| 1603 | |
| 1604 | ret = ocfs2_find_path(ci, path, old_cpos); |
| 1605 | if (ret) { |
| 1606 | mlog_errno(ret); |
| 1607 | goto out; |
| 1608 | } |
| 1609 | |
| 1610 | /* |
| 1611 | * 2 more credits, one for the leaf refcount block, one for |
| 1612 | * the extent block contains the extent rec. |
| 1613 | */ |
| 1614 | ret = ocfs2_extend_trans(handle, handle->h_buffer_credits + 2); |
| 1615 | if (ret < 0) { |
| 1616 | mlog_errno(ret); |
| 1617 | goto out; |
| 1618 | } |
| 1619 | |
| 1620 | ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, |
| 1621 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1622 | if (ret < 0) { |
| 1623 | mlog_errno(ret); |
| 1624 | goto out; |
| 1625 | } |
| 1626 | |
| 1627 | ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path), |
| 1628 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1629 | if (ret < 0) { |
| 1630 | mlog_errno(ret); |
| 1631 | goto out; |
| 1632 | } |
| 1633 | |
| 1634 | /* change the leaf extent block first. */ |
| 1635 | el = path_leaf_el(path); |
| 1636 | |
| 1637 | for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) |
| 1638 | if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos) |
| 1639 | break; |
| 1640 | |
| 1641 | BUG_ON(i == le16_to_cpu(el->l_next_free_rec)); |
| 1642 | |
| 1643 | el->l_recs[i].e_cpos = cpu_to_le32(new_cpos); |
| 1644 | |
| 1645 | /* change the r_cpos in the leaf block. */ |
| 1646 | rb->rf_cpos = cpu_to_le32(new_cpos); |
| 1647 | |
| 1648 | ocfs2_journal_dirty(handle, path_leaf_bh(path)); |
| 1649 | ocfs2_journal_dirty(handle, ref_leaf_bh); |
| 1650 | |
| 1651 | out: |
| 1652 | ocfs2_free_path(path); |
| 1653 | return ret; |
| 1654 | } |
| 1655 | |
| 1656 | static int ocfs2_insert_refcount_rec(handle_t *handle, |
| 1657 | struct ocfs2_caching_info *ci, |
| 1658 | struct buffer_head *ref_root_bh, |
| 1659 | struct buffer_head *ref_leaf_bh, |
| 1660 | struct ocfs2_refcount_rec *rec, |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 1661 | int index, int merge, |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1662 | struct ocfs2_alloc_context *meta_ac) |
| 1663 | { |
| 1664 | int ret; |
| 1665 | struct ocfs2_refcount_block *rb = |
| 1666 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
| 1667 | struct ocfs2_refcount_list *rf_list = &rb->rf_records; |
| 1668 | struct buffer_head *new_bh = NULL; |
| 1669 | |
| 1670 | BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL); |
| 1671 | |
| 1672 | if (rf_list->rl_used == rf_list->rl_count) { |
| 1673 | u64 cpos = le64_to_cpu(rec->r_cpos); |
| 1674 | u32 len = le32_to_cpu(rec->r_clusters); |
| 1675 | |
| 1676 | ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh, |
| 1677 | ref_leaf_bh, meta_ac); |
| 1678 | if (ret) { |
| 1679 | mlog_errno(ret); |
| 1680 | goto out; |
| 1681 | } |
| 1682 | |
| 1683 | ret = ocfs2_get_refcount_rec(ci, ref_root_bh, |
| 1684 | cpos, len, NULL, &index, |
| 1685 | &new_bh); |
| 1686 | if (ret) { |
| 1687 | mlog_errno(ret); |
| 1688 | goto out; |
| 1689 | } |
| 1690 | |
| 1691 | ref_leaf_bh = new_bh; |
| 1692 | rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
| 1693 | rf_list = &rb->rf_records; |
| 1694 | } |
| 1695 | |
| 1696 | ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, |
| 1697 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1698 | if (ret) { |
| 1699 | mlog_errno(ret); |
| 1700 | goto out; |
| 1701 | } |
| 1702 | |
| 1703 | if (index < le16_to_cpu(rf_list->rl_used)) |
| 1704 | memmove(&rf_list->rl_recs[index + 1], |
| 1705 | &rf_list->rl_recs[index], |
| 1706 | (le16_to_cpu(rf_list->rl_used) - index) * |
| 1707 | sizeof(struct ocfs2_refcount_rec)); |
| 1708 | |
| 1709 | mlog(0, "insert refcount record start %llu, len %u, count %u " |
| 1710 | "to leaf block %llu at index %d\n", |
| 1711 | (unsigned long long)le64_to_cpu(rec->r_cpos), |
| 1712 | le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount), |
| 1713 | (unsigned long long)ref_leaf_bh->b_blocknr, index); |
| 1714 | |
| 1715 | rf_list->rl_recs[index] = *rec; |
| 1716 | |
| 1717 | le16_add_cpu(&rf_list->rl_used, 1); |
| 1718 | |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 1719 | if (merge) |
| 1720 | ocfs2_refcount_rec_merge(rb, index); |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1721 | |
| 1722 | ret = ocfs2_journal_dirty(handle, ref_leaf_bh); |
| 1723 | if (ret) { |
| 1724 | mlog_errno(ret); |
| 1725 | goto out; |
| 1726 | } |
| 1727 | |
| 1728 | if (index == 0) { |
| 1729 | ret = ocfs2_adjust_refcount_rec(handle, ci, |
| 1730 | ref_root_bh, |
| 1731 | ref_leaf_bh, rec); |
| 1732 | if (ret) |
| 1733 | mlog_errno(ret); |
| 1734 | } |
| 1735 | out: |
| 1736 | brelse(new_bh); |
| 1737 | return ret; |
| 1738 | } |
| 1739 | |
| 1740 | /* |
| 1741 | * Split the refcount_rec indexed by "index" in ref_leaf_bh. |
| 1742 | * This is much simple than our b-tree code. |
| 1743 | * split_rec is the new refcount rec we want to insert. |
| 1744 | * If split_rec->r_refcount > 0, we are changing the refcount(in case we |
| 1745 | * increase refcount or decrease a refcount to non-zero). |
| 1746 | * If split_rec->r_refcount == 0, we are punching a hole in current refcount |
| 1747 | * rec( in case we decrease a refcount to zero). |
| 1748 | */ |
| 1749 | static int ocfs2_split_refcount_rec(handle_t *handle, |
| 1750 | struct ocfs2_caching_info *ci, |
| 1751 | struct buffer_head *ref_root_bh, |
| 1752 | struct buffer_head *ref_leaf_bh, |
| 1753 | struct ocfs2_refcount_rec *split_rec, |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 1754 | int index, int merge, |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1755 | struct ocfs2_alloc_context *meta_ac, |
| 1756 | struct ocfs2_cached_dealloc_ctxt *dealloc) |
| 1757 | { |
| 1758 | int ret, recs_need; |
| 1759 | u32 len; |
| 1760 | struct ocfs2_refcount_block *rb = |
| 1761 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
| 1762 | struct ocfs2_refcount_list *rf_list = &rb->rf_records; |
| 1763 | struct ocfs2_refcount_rec *orig_rec = &rf_list->rl_recs[index]; |
| 1764 | struct ocfs2_refcount_rec *tail_rec = NULL; |
| 1765 | struct buffer_head *new_bh = NULL; |
| 1766 | |
| 1767 | BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL); |
| 1768 | |
| 1769 | mlog(0, "original r_pos %llu, cluster %u, split %llu, cluster %u\n", |
| 1770 | le64_to_cpu(orig_rec->r_cpos), le32_to_cpu(orig_rec->r_clusters), |
| 1771 | le64_to_cpu(split_rec->r_cpos), |
| 1772 | le32_to_cpu(split_rec->r_clusters)); |
| 1773 | |
| 1774 | /* |
| 1775 | * If we just need to split the header or tail clusters, |
| 1776 | * no more recs are needed, just split is OK. |
| 1777 | * Otherwise we at least need one new recs. |
| 1778 | */ |
| 1779 | if (!split_rec->r_refcount && |
| 1780 | (split_rec->r_cpos == orig_rec->r_cpos || |
| 1781 | le64_to_cpu(split_rec->r_cpos) + |
| 1782 | le32_to_cpu(split_rec->r_clusters) == |
| 1783 | le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters))) |
| 1784 | recs_need = 0; |
| 1785 | else |
| 1786 | recs_need = 1; |
| 1787 | |
| 1788 | /* |
| 1789 | * We need one more rec if we split in the middle and the new rec have |
| 1790 | * some refcount in it. |
| 1791 | */ |
| 1792 | if (split_rec->r_refcount && |
| 1793 | (split_rec->r_cpos != orig_rec->r_cpos && |
| 1794 | le64_to_cpu(split_rec->r_cpos) + |
| 1795 | le32_to_cpu(split_rec->r_clusters) != |
| 1796 | le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters))) |
| 1797 | recs_need++; |
| 1798 | |
| 1799 | /* If the leaf block don't have enough record, expand it. */ |
| 1800 | if (le16_to_cpu(rf_list->rl_used) + recs_need > rf_list->rl_count) { |
| 1801 | struct ocfs2_refcount_rec tmp_rec; |
| 1802 | u64 cpos = le64_to_cpu(orig_rec->r_cpos); |
| 1803 | len = le32_to_cpu(orig_rec->r_clusters); |
| 1804 | ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh, |
| 1805 | ref_leaf_bh, meta_ac); |
| 1806 | if (ret) { |
| 1807 | mlog_errno(ret); |
| 1808 | goto out; |
| 1809 | } |
| 1810 | |
| 1811 | /* |
| 1812 | * We have to re-get it since now cpos may be moved to |
| 1813 | * another leaf block. |
| 1814 | */ |
| 1815 | ret = ocfs2_get_refcount_rec(ci, ref_root_bh, |
| 1816 | cpos, len, &tmp_rec, &index, |
| 1817 | &new_bh); |
| 1818 | if (ret) { |
| 1819 | mlog_errno(ret); |
| 1820 | goto out; |
| 1821 | } |
| 1822 | |
| 1823 | ref_leaf_bh = new_bh; |
| 1824 | rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
| 1825 | rf_list = &rb->rf_records; |
| 1826 | orig_rec = &rf_list->rl_recs[index]; |
| 1827 | } |
| 1828 | |
| 1829 | ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, |
| 1830 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1831 | if (ret) { |
| 1832 | mlog_errno(ret); |
| 1833 | goto out; |
| 1834 | } |
| 1835 | |
| 1836 | /* |
| 1837 | * We have calculated out how many new records we need and store |
| 1838 | * in recs_need, so spare enough space first by moving the records |
| 1839 | * after "index" to the end. |
| 1840 | */ |
| 1841 | if (index != le16_to_cpu(rf_list->rl_used) - 1) |
| 1842 | memmove(&rf_list->rl_recs[index + 1 + recs_need], |
| 1843 | &rf_list->rl_recs[index + 1], |
| 1844 | (le16_to_cpu(rf_list->rl_used) - index - 1) * |
| 1845 | sizeof(struct ocfs2_refcount_rec)); |
| 1846 | |
| 1847 | len = (le64_to_cpu(orig_rec->r_cpos) + |
| 1848 | le32_to_cpu(orig_rec->r_clusters)) - |
| 1849 | (le64_to_cpu(split_rec->r_cpos) + |
| 1850 | le32_to_cpu(split_rec->r_clusters)); |
| 1851 | |
| 1852 | /* |
| 1853 | * If we have "len", the we will split in the tail and move it |
| 1854 | * to the end of the space we have just spared. |
| 1855 | */ |
| 1856 | if (len) { |
| 1857 | tail_rec = &rf_list->rl_recs[index + recs_need]; |
| 1858 | |
| 1859 | memcpy(tail_rec, orig_rec, sizeof(struct ocfs2_refcount_rec)); |
| 1860 | le64_add_cpu(&tail_rec->r_cpos, |
| 1861 | le32_to_cpu(tail_rec->r_clusters) - len); |
| 1862 | tail_rec->r_clusters = le32_to_cpu(len); |
| 1863 | } |
| 1864 | |
| 1865 | /* |
| 1866 | * If the split pos isn't the same as the original one, we need to |
| 1867 | * split in the head. |
| 1868 | * |
| 1869 | * Note: We have the chance that split_rec.r_refcount = 0, |
| 1870 | * recs_need = 0 and len > 0, which means we just cut the head from |
| 1871 | * the orig_rec and in that case we have done some modification in |
| 1872 | * orig_rec above, so the check for r_cpos is faked. |
| 1873 | */ |
| 1874 | if (split_rec->r_cpos != orig_rec->r_cpos && tail_rec != orig_rec) { |
| 1875 | len = le64_to_cpu(split_rec->r_cpos) - |
| 1876 | le64_to_cpu(orig_rec->r_cpos); |
| 1877 | orig_rec->r_clusters = cpu_to_le32(len); |
| 1878 | index++; |
| 1879 | } |
| 1880 | |
| 1881 | le16_add_cpu(&rf_list->rl_used, recs_need); |
| 1882 | |
| 1883 | if (split_rec->r_refcount) { |
| 1884 | rf_list->rl_recs[index] = *split_rec; |
| 1885 | mlog(0, "insert refcount record start %llu, len %u, count %u " |
| 1886 | "to leaf block %llu at index %d\n", |
| 1887 | (unsigned long long)le64_to_cpu(split_rec->r_cpos), |
| 1888 | le32_to_cpu(split_rec->r_clusters), |
| 1889 | le32_to_cpu(split_rec->r_refcount), |
| 1890 | (unsigned long long)ref_leaf_bh->b_blocknr, index); |
| 1891 | |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 1892 | if (merge) |
| 1893 | ocfs2_refcount_rec_merge(rb, index); |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1894 | } |
| 1895 | |
| 1896 | ret = ocfs2_journal_dirty(handle, ref_leaf_bh); |
| 1897 | if (ret) |
| 1898 | mlog_errno(ret); |
| 1899 | |
| 1900 | out: |
| 1901 | brelse(new_bh); |
| 1902 | return ret; |
| 1903 | } |
| 1904 | |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 1905 | static int __ocfs2_increase_refcount(handle_t *handle, |
| 1906 | struct ocfs2_caching_info *ci, |
| 1907 | struct buffer_head *ref_root_bh, |
| 1908 | u64 cpos, u32 len, int merge, |
| 1909 | struct ocfs2_alloc_context *meta_ac, |
| 1910 | struct ocfs2_cached_dealloc_ctxt *dealloc) |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1911 | { |
| 1912 | int ret = 0, index; |
| 1913 | struct buffer_head *ref_leaf_bh = NULL; |
| 1914 | struct ocfs2_refcount_rec rec; |
| 1915 | unsigned int set_len = 0; |
| 1916 | |
| 1917 | mlog(0, "Tree owner %llu, add refcount start %llu, len %u\n", |
| 1918 | (unsigned long long)ocfs2_metadata_cache_owner(ci), |
| 1919 | (unsigned long long)cpos, len); |
| 1920 | |
| 1921 | while (len) { |
| 1922 | ret = ocfs2_get_refcount_rec(ci, ref_root_bh, |
| 1923 | cpos, len, &rec, &index, |
| 1924 | &ref_leaf_bh); |
| 1925 | if (ret) { |
| 1926 | mlog_errno(ret); |
| 1927 | goto out; |
| 1928 | } |
| 1929 | |
| 1930 | set_len = le32_to_cpu(rec.r_clusters); |
| 1931 | |
| 1932 | /* |
| 1933 | * Here we may meet with 3 situations: |
| 1934 | * |
| 1935 | * 1. If we find an already existing record, and the length |
| 1936 | * is the same, cool, we just need to increase the r_refcount |
| 1937 | * and it is OK. |
| 1938 | * 2. If we find a hole, just insert it with r_refcount = 1. |
| 1939 | * 3. If we are in the middle of one extent record, split |
| 1940 | * it. |
| 1941 | */ |
| 1942 | if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos && |
| 1943 | set_len <= len) { |
| 1944 | mlog(0, "increase refcount rec, start %llu, len %u, " |
| 1945 | "count %u\n", (unsigned long long)cpos, set_len, |
| 1946 | le32_to_cpu(rec.r_refcount)); |
| 1947 | ret = ocfs2_change_refcount_rec(handle, ci, |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 1948 | ref_leaf_bh, index, |
| 1949 | merge, 1); |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1950 | if (ret) { |
| 1951 | mlog_errno(ret); |
| 1952 | goto out; |
| 1953 | } |
| 1954 | } else if (!rec.r_refcount) { |
| 1955 | rec.r_refcount = cpu_to_le32(1); |
| 1956 | |
| 1957 | mlog(0, "insert refcount rec, start %llu, len %u\n", |
| 1958 | (unsigned long long)le64_to_cpu(rec.r_cpos), |
| 1959 | set_len); |
| 1960 | ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh, |
| 1961 | ref_leaf_bh, |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 1962 | &rec, index, |
| 1963 | merge, meta_ac); |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1964 | if (ret) { |
| 1965 | mlog_errno(ret); |
| 1966 | goto out; |
| 1967 | } |
| 1968 | } else { |
| 1969 | set_len = min((u64)(cpos + len), |
| 1970 | le64_to_cpu(rec.r_cpos) + set_len) - cpos; |
| 1971 | rec.r_cpos = cpu_to_le64(cpos); |
| 1972 | rec.r_clusters = cpu_to_le32(set_len); |
| 1973 | le32_add_cpu(&rec.r_refcount, 1); |
| 1974 | |
| 1975 | mlog(0, "split refcount rec, start %llu, " |
| 1976 | "len %u, count %u\n", |
| 1977 | (unsigned long long)le64_to_cpu(rec.r_cpos), |
| 1978 | set_len, le32_to_cpu(rec.r_refcount)); |
| 1979 | ret = ocfs2_split_refcount_rec(handle, ci, |
| 1980 | ref_root_bh, ref_leaf_bh, |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 1981 | &rec, index, merge, |
Tao Ma | e73a819 | 2009-08-11 14:33:14 +0800 | [diff] [blame] | 1982 | meta_ac, dealloc); |
| 1983 | if (ret) { |
| 1984 | mlog_errno(ret); |
| 1985 | goto out; |
| 1986 | } |
| 1987 | } |
| 1988 | |
| 1989 | cpos += set_len; |
| 1990 | len -= set_len; |
| 1991 | brelse(ref_leaf_bh); |
| 1992 | ref_leaf_bh = NULL; |
| 1993 | } |
| 1994 | |
| 1995 | out: |
| 1996 | brelse(ref_leaf_bh); |
| 1997 | return ret; |
| 1998 | } |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 1999 | |
| 2000 | static int ocfs2_remove_refcount_extent(handle_t *handle, |
| 2001 | struct ocfs2_caching_info *ci, |
| 2002 | struct buffer_head *ref_root_bh, |
| 2003 | struct buffer_head *ref_leaf_bh, |
| 2004 | struct ocfs2_alloc_context *meta_ac, |
| 2005 | struct ocfs2_cached_dealloc_ctxt *dealloc) |
| 2006 | { |
| 2007 | int ret; |
| 2008 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); |
| 2009 | struct ocfs2_refcount_block *rb = |
| 2010 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
| 2011 | struct ocfs2_extent_tree et; |
| 2012 | |
| 2013 | BUG_ON(rb->rf_records.rl_used); |
| 2014 | |
| 2015 | ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh); |
| 2016 | ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos), |
| 2017 | 1, meta_ac, dealloc); |
| 2018 | if (ret) { |
| 2019 | mlog_errno(ret); |
| 2020 | goto out; |
| 2021 | } |
| 2022 | |
| 2023 | ocfs2_remove_from_cache(ci, ref_leaf_bh); |
| 2024 | |
| 2025 | /* |
| 2026 | * add the freed block to the dealloc so that it will be freed |
| 2027 | * when we run dealloc. |
| 2028 | */ |
| 2029 | ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE, |
| 2030 | le16_to_cpu(rb->rf_suballoc_slot), |
| 2031 | le64_to_cpu(rb->rf_blkno), |
| 2032 | le16_to_cpu(rb->rf_suballoc_bit)); |
| 2033 | if (ret) { |
| 2034 | mlog_errno(ret); |
| 2035 | goto out; |
| 2036 | } |
| 2037 | |
| 2038 | ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh, |
| 2039 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 2040 | if (ret) { |
| 2041 | mlog_errno(ret); |
| 2042 | goto out; |
| 2043 | } |
| 2044 | |
| 2045 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; |
| 2046 | |
| 2047 | le32_add_cpu(&rb->rf_clusters, -1); |
| 2048 | |
| 2049 | /* |
| 2050 | * check whether we need to restore the root refcount block if |
| 2051 | * there is no leaf extent block at atll. |
| 2052 | */ |
| 2053 | if (!rb->rf_list.l_next_free_rec) { |
| 2054 | BUG_ON(rb->rf_clusters); |
| 2055 | |
| 2056 | mlog(0, "reset refcount tree root %llu to be a record block.\n", |
| 2057 | (unsigned long long)ref_root_bh->b_blocknr); |
| 2058 | |
| 2059 | rb->rf_flags = 0; |
| 2060 | rb->rf_parent = 0; |
| 2061 | rb->rf_cpos = 0; |
| 2062 | memset(&rb->rf_records, 0, sb->s_blocksize - |
| 2063 | offsetof(struct ocfs2_refcount_block, rf_records)); |
| 2064 | rb->rf_records.rl_count = |
| 2065 | cpu_to_le16(ocfs2_refcount_recs_per_rb(sb)); |
| 2066 | } |
| 2067 | |
| 2068 | ocfs2_journal_dirty(handle, ref_root_bh); |
| 2069 | |
| 2070 | out: |
| 2071 | return ret; |
| 2072 | } |
| 2073 | |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 2074 | int ocfs2_increase_refcount(handle_t *handle, |
| 2075 | struct ocfs2_caching_info *ci, |
| 2076 | struct buffer_head *ref_root_bh, |
| 2077 | u64 cpos, u32 len, |
| 2078 | struct ocfs2_alloc_context *meta_ac, |
| 2079 | struct ocfs2_cached_dealloc_ctxt *dealloc) |
| 2080 | { |
| 2081 | return __ocfs2_increase_refcount(handle, ci, ref_root_bh, |
| 2082 | cpos, len, 1, |
| 2083 | meta_ac, dealloc); |
| 2084 | } |
| 2085 | |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 2086 | static int ocfs2_decrease_refcount_rec(handle_t *handle, |
| 2087 | struct ocfs2_caching_info *ci, |
| 2088 | struct buffer_head *ref_root_bh, |
| 2089 | struct buffer_head *ref_leaf_bh, |
| 2090 | int index, u64 cpos, unsigned int len, |
| 2091 | struct ocfs2_alloc_context *meta_ac, |
| 2092 | struct ocfs2_cached_dealloc_ctxt *dealloc) |
| 2093 | { |
| 2094 | int ret; |
| 2095 | struct ocfs2_refcount_block *rb = |
| 2096 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
| 2097 | struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index]; |
| 2098 | |
| 2099 | BUG_ON(cpos < le64_to_cpu(rec->r_cpos)); |
| 2100 | BUG_ON(cpos + len > |
| 2101 | le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters)); |
| 2102 | |
| 2103 | if (cpos == le64_to_cpu(rec->r_cpos) && |
| 2104 | len == le32_to_cpu(rec->r_clusters)) |
| 2105 | ret = ocfs2_change_refcount_rec(handle, ci, |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 2106 | ref_leaf_bh, index, 1, -1); |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 2107 | else { |
| 2108 | struct ocfs2_refcount_rec split = *rec; |
| 2109 | split.r_cpos = cpu_to_le64(cpos); |
| 2110 | split.r_clusters = cpu_to_le32(len); |
| 2111 | |
| 2112 | le32_add_cpu(&split.r_refcount, -1); |
| 2113 | |
| 2114 | mlog(0, "split refcount rec, start %llu, " |
| 2115 | "len %u, count %u, original start %llu, len %u\n", |
| 2116 | (unsigned long long)le64_to_cpu(split.r_cpos), |
| 2117 | len, le32_to_cpu(split.r_refcount), |
| 2118 | (unsigned long long)le64_to_cpu(rec->r_cpos), |
| 2119 | le32_to_cpu(rec->r_clusters)); |
| 2120 | ret = ocfs2_split_refcount_rec(handle, ci, |
| 2121 | ref_root_bh, ref_leaf_bh, |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 2122 | &split, index, 1, |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 2123 | meta_ac, dealloc); |
| 2124 | } |
| 2125 | |
| 2126 | if (ret) { |
| 2127 | mlog_errno(ret); |
| 2128 | goto out; |
| 2129 | } |
| 2130 | |
| 2131 | /* Remove the leaf refcount block if it contains no refcount record. */ |
| 2132 | if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) { |
| 2133 | ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh, |
| 2134 | ref_leaf_bh, meta_ac, |
| 2135 | dealloc); |
| 2136 | if (ret) |
| 2137 | mlog_errno(ret); |
| 2138 | } |
| 2139 | |
| 2140 | out: |
| 2141 | return ret; |
| 2142 | } |
| 2143 | |
| 2144 | static int __ocfs2_decrease_refcount(handle_t *handle, |
| 2145 | struct ocfs2_caching_info *ci, |
| 2146 | struct buffer_head *ref_root_bh, |
| 2147 | u64 cpos, u32 len, |
| 2148 | struct ocfs2_alloc_context *meta_ac, |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 2149 | struct ocfs2_cached_dealloc_ctxt *dealloc, |
| 2150 | int delete) |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 2151 | { |
| 2152 | int ret = 0, index = 0; |
| 2153 | struct ocfs2_refcount_rec rec; |
| 2154 | unsigned int r_count = 0, r_len; |
| 2155 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); |
| 2156 | struct buffer_head *ref_leaf_bh = NULL; |
| 2157 | |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 2158 | mlog(0, "Tree owner %llu, decrease refcount start %llu, " |
| 2159 | "len %u, delete %u\n", |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 2160 | (unsigned long long)ocfs2_metadata_cache_owner(ci), |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 2161 | (unsigned long long)cpos, len, delete); |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 2162 | |
| 2163 | while (len) { |
| 2164 | ret = ocfs2_get_refcount_rec(ci, ref_root_bh, |
| 2165 | cpos, len, &rec, &index, |
| 2166 | &ref_leaf_bh); |
| 2167 | if (ret) { |
| 2168 | mlog_errno(ret); |
| 2169 | goto out; |
| 2170 | } |
| 2171 | |
| 2172 | r_count = le32_to_cpu(rec.r_refcount); |
| 2173 | BUG_ON(r_count == 0); |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 2174 | if (!delete) |
| 2175 | BUG_ON(r_count > 1); |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 2176 | |
| 2177 | r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) + |
| 2178 | le32_to_cpu(rec.r_clusters)) - cpos; |
| 2179 | |
| 2180 | ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh, |
| 2181 | ref_leaf_bh, index, |
| 2182 | cpos, r_len, |
| 2183 | meta_ac, dealloc); |
| 2184 | if (ret) { |
| 2185 | mlog_errno(ret); |
| 2186 | goto out; |
| 2187 | } |
| 2188 | |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 2189 | if (le32_to_cpu(rec.r_refcount) == 1 && delete) { |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 2190 | ret = ocfs2_cache_cluster_dealloc(dealloc, |
| 2191 | ocfs2_clusters_to_blocks(sb, cpos), |
| 2192 | r_len); |
| 2193 | if (ret) { |
| 2194 | mlog_errno(ret); |
| 2195 | goto out; |
| 2196 | } |
| 2197 | } |
| 2198 | |
| 2199 | cpos += r_len; |
| 2200 | len -= r_len; |
| 2201 | brelse(ref_leaf_bh); |
| 2202 | ref_leaf_bh = NULL; |
| 2203 | } |
| 2204 | |
| 2205 | out: |
| 2206 | brelse(ref_leaf_bh); |
| 2207 | return ret; |
| 2208 | } |
| 2209 | |
| 2210 | /* Caller must hold refcount tree lock. */ |
| 2211 | int ocfs2_decrease_refcount(struct inode *inode, |
| 2212 | handle_t *handle, u32 cpos, u32 len, |
| 2213 | struct ocfs2_alloc_context *meta_ac, |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 2214 | struct ocfs2_cached_dealloc_ctxt *dealloc, |
| 2215 | int delete) |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 2216 | { |
| 2217 | int ret; |
| 2218 | u64 ref_blkno; |
| 2219 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 2220 | struct buffer_head *ref_root_bh = NULL; |
| 2221 | struct ocfs2_refcount_tree *tree; |
| 2222 | |
| 2223 | BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); |
| 2224 | |
| 2225 | ret = ocfs2_get_refcount_block(inode, &ref_blkno); |
| 2226 | if (ret) { |
| 2227 | mlog_errno(ret); |
| 2228 | goto out; |
| 2229 | } |
| 2230 | |
| 2231 | ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree); |
| 2232 | if (ret) { |
| 2233 | mlog_errno(ret); |
| 2234 | goto out; |
| 2235 | } |
| 2236 | |
| 2237 | ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno, |
| 2238 | &ref_root_bh); |
| 2239 | if (ret) { |
| 2240 | mlog_errno(ret); |
| 2241 | goto out; |
| 2242 | } |
| 2243 | |
| 2244 | ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh, |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 2245 | cpos, len, meta_ac, dealloc, delete); |
Tao Ma | 1823cb0 | 2009-08-18 11:24:49 +0800 | [diff] [blame] | 2246 | if (ret) |
| 2247 | mlog_errno(ret); |
| 2248 | out: |
| 2249 | brelse(ref_root_bh); |
| 2250 | return ret; |
| 2251 | } |
Tao Ma | 1aa75fe | 2009-08-18 11:28:39 +0800 | [diff] [blame] | 2252 | |
| 2253 | /* |
| 2254 | * Mark the already-existing extent at cpos as refcounted for len clusters. |
| 2255 | * This adds the refcount extent flag. |
| 2256 | * |
| 2257 | * If the existing extent is larger than the request, initiate a |
| 2258 | * split. An attempt will be made at merging with adjacent extents. |
| 2259 | * |
| 2260 | * The caller is responsible for passing down meta_ac if we'll need it. |
| 2261 | */ |
| 2262 | static int ocfs2_mark_extent_refcounted(struct inode *inode, |
| 2263 | struct ocfs2_extent_tree *et, |
| 2264 | handle_t *handle, u32 cpos, |
| 2265 | u32 len, u32 phys, |
| 2266 | struct ocfs2_alloc_context *meta_ac, |
| 2267 | struct ocfs2_cached_dealloc_ctxt *dealloc) |
| 2268 | { |
| 2269 | int ret; |
| 2270 | |
| 2271 | mlog(0, "Inode %lu refcount tree cpos %u, len %u, phys cluster %u\n", |
| 2272 | inode->i_ino, cpos, len, phys); |
| 2273 | |
| 2274 | if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) { |
| 2275 | ocfs2_error(inode->i_sb, "Inode %lu want to use refcount " |
| 2276 | "tree, but the feature bit is not set in the " |
| 2277 | "super block.", inode->i_ino); |
| 2278 | ret = -EROFS; |
| 2279 | goto out; |
| 2280 | } |
| 2281 | |
| 2282 | ret = ocfs2_change_extent_flag(handle, et, cpos, |
| 2283 | len, phys, meta_ac, dealloc, |
| 2284 | OCFS2_EXT_REFCOUNTED, 0); |
| 2285 | if (ret) |
| 2286 | mlog_errno(ret); |
| 2287 | |
| 2288 | out: |
| 2289 | return ret; |
| 2290 | } |
Tao Ma | bcbbb24 | 2009-08-18 11:29:12 +0800 | [diff] [blame] | 2291 | |
| 2292 | /* |
| 2293 | * Given some contiguous physical clusters, calculate what we need |
| 2294 | * for modifying their refcount. |
| 2295 | */ |
| 2296 | static int ocfs2_calc_refcount_meta_credits(struct super_block *sb, |
| 2297 | struct ocfs2_caching_info *ci, |
| 2298 | struct buffer_head *ref_root_bh, |
| 2299 | u64 start_cpos, |
| 2300 | u32 clusters, |
| 2301 | int *meta_add, |
| 2302 | int *credits) |
| 2303 | { |
| 2304 | int ret = 0, index, ref_blocks = 0, recs_add = 0; |
| 2305 | u64 cpos = start_cpos; |
| 2306 | struct ocfs2_refcount_block *rb; |
| 2307 | struct ocfs2_refcount_rec rec; |
| 2308 | struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL; |
| 2309 | u32 len; |
| 2310 | |
| 2311 | mlog(0, "start_cpos %llu, clusters %u\n", |
| 2312 | (unsigned long long)start_cpos, clusters); |
| 2313 | while (clusters) { |
| 2314 | ret = ocfs2_get_refcount_rec(ci, ref_root_bh, |
| 2315 | cpos, clusters, &rec, |
| 2316 | &index, &ref_leaf_bh); |
| 2317 | if (ret) { |
| 2318 | mlog_errno(ret); |
| 2319 | goto out; |
| 2320 | } |
| 2321 | |
| 2322 | if (ref_leaf_bh != prev_bh) { |
| 2323 | /* |
| 2324 | * Now we encounter a new leaf block, so calculate |
| 2325 | * whether we need to extend the old leaf. |
| 2326 | */ |
| 2327 | if (prev_bh) { |
| 2328 | rb = (struct ocfs2_refcount_block *) |
| 2329 | prev_bh->b_data; |
| 2330 | |
| 2331 | if (le64_to_cpu(rb->rf_records.rl_used) + |
| 2332 | recs_add > |
| 2333 | le16_to_cpu(rb->rf_records.rl_count)) |
| 2334 | ref_blocks++; |
| 2335 | } |
| 2336 | |
| 2337 | recs_add = 0; |
| 2338 | *credits += 1; |
| 2339 | brelse(prev_bh); |
| 2340 | prev_bh = ref_leaf_bh; |
| 2341 | get_bh(prev_bh); |
| 2342 | } |
| 2343 | |
| 2344 | rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
| 2345 | |
| 2346 | mlog(0, "recs_add %d,cpos %llu, clusters %u, rec->r_cpos %llu," |
| 2347 | "rec->r_clusters %u, rec->r_refcount %u, index %d\n", |
| 2348 | recs_add, (unsigned long long)cpos, clusters, |
| 2349 | (unsigned long long)le64_to_cpu(rec.r_cpos), |
| 2350 | le32_to_cpu(rec.r_clusters), |
| 2351 | le32_to_cpu(rec.r_refcount), index); |
| 2352 | |
| 2353 | len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) + |
| 2354 | le32_to_cpu(rec.r_clusters)) - cpos; |
| 2355 | /* |
| 2356 | * If the refcount rec already exist, cool. We just need |
| 2357 | * to check whether there is a split. Otherwise we just need |
| 2358 | * to increase the refcount. |
| 2359 | * If we will insert one, increases recs_add. |
| 2360 | * |
| 2361 | * We record all the records which will be inserted to the |
| 2362 | * same refcount block, so that we can tell exactly whether |
| 2363 | * we need a new refcount block or not. |
| 2364 | */ |
| 2365 | if (rec.r_refcount) { |
| 2366 | /* Check whether we need a split at the beginning. */ |
| 2367 | if (cpos == start_cpos && |
| 2368 | cpos != le64_to_cpu(rec.r_cpos)) |
| 2369 | recs_add++; |
| 2370 | |
| 2371 | /* Check whether we need a split in the end. */ |
| 2372 | if (cpos + clusters < le64_to_cpu(rec.r_cpos) + |
| 2373 | le32_to_cpu(rec.r_clusters)) |
| 2374 | recs_add++; |
| 2375 | } else |
| 2376 | recs_add++; |
| 2377 | |
| 2378 | brelse(ref_leaf_bh); |
| 2379 | ref_leaf_bh = NULL; |
| 2380 | clusters -= len; |
| 2381 | cpos += len; |
| 2382 | } |
| 2383 | |
| 2384 | if (prev_bh) { |
| 2385 | rb = (struct ocfs2_refcount_block *)prev_bh->b_data; |
| 2386 | |
| 2387 | if (le64_to_cpu(rb->rf_records.rl_used) + recs_add > |
| 2388 | le16_to_cpu(rb->rf_records.rl_count)) |
| 2389 | ref_blocks++; |
| 2390 | |
| 2391 | *credits += 1; |
| 2392 | } |
| 2393 | |
| 2394 | if (!ref_blocks) |
| 2395 | goto out; |
| 2396 | |
| 2397 | mlog(0, "we need ref_blocks %d\n", ref_blocks); |
| 2398 | *meta_add += ref_blocks; |
| 2399 | *credits += ref_blocks; |
| 2400 | |
| 2401 | /* |
| 2402 | * So we may need ref_blocks to insert into the tree. |
| 2403 | * That also means we need to change the b-tree and add that number |
| 2404 | * of records since we never merge them. |
| 2405 | * We need one more block for expansion since the new created leaf |
| 2406 | * block is also full and needs split. |
| 2407 | */ |
| 2408 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; |
| 2409 | if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) { |
| 2410 | struct ocfs2_extent_tree et; |
| 2411 | |
| 2412 | ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh); |
| 2413 | *meta_add += ocfs2_extend_meta_needed(et.et_root_el); |
| 2414 | *credits += ocfs2_calc_extend_credits(sb, |
| 2415 | et.et_root_el, |
| 2416 | ref_blocks); |
| 2417 | } else { |
| 2418 | *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS; |
| 2419 | *meta_add += 1; |
| 2420 | } |
| 2421 | |
| 2422 | out: |
| 2423 | brelse(ref_leaf_bh); |
| 2424 | brelse(prev_bh); |
| 2425 | return ret; |
| 2426 | } |
| 2427 | |
| 2428 | /* |
| 2429 | * For refcount tree, we will decrease some contiguous clusters |
| 2430 | * refcount count, so just go through it to see how many blocks |
| 2431 | * we gonna touch and whether we need to create new blocks. |
| 2432 | * |
| 2433 | * Normally the refcount blocks store these refcount should be |
| 2434 | * continguous also, so that we can get the number easily. |
| 2435 | * As for meta_ac, we will at most add split 2 refcount record and |
| 2436 | * 2 more refcount block, so just check it in a rough way. |
| 2437 | * |
| 2438 | * Caller must hold refcount tree lock. |
| 2439 | */ |
| 2440 | int ocfs2_prepare_refcount_change_for_del(struct inode *inode, |
| 2441 | struct buffer_head *di_bh, |
| 2442 | u64 phys_blkno, |
| 2443 | u32 clusters, |
| 2444 | int *credits, |
| 2445 | struct ocfs2_alloc_context **meta_ac) |
| 2446 | { |
| 2447 | int ret, ref_blocks = 0; |
| 2448 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 2449 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 2450 | struct buffer_head *ref_root_bh = NULL; |
| 2451 | struct ocfs2_refcount_tree *tree; |
| 2452 | u64 start_cpos = ocfs2_blocks_to_clusters(inode->i_sb, phys_blkno); |
| 2453 | |
| 2454 | if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) { |
| 2455 | ocfs2_error(inode->i_sb, "Inode %lu want to use refcount " |
| 2456 | "tree, but the feature bit is not set in the " |
| 2457 | "super block.", inode->i_ino); |
| 2458 | ret = -EROFS; |
| 2459 | goto out; |
| 2460 | } |
| 2461 | |
| 2462 | BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); |
| 2463 | |
| 2464 | ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), |
| 2465 | le64_to_cpu(di->i_refcount_loc), &tree); |
| 2466 | if (ret) { |
| 2467 | mlog_errno(ret); |
| 2468 | goto out; |
| 2469 | } |
| 2470 | |
| 2471 | ret = ocfs2_read_refcount_block(&tree->rf_ci, |
| 2472 | le64_to_cpu(di->i_refcount_loc), |
| 2473 | &ref_root_bh); |
| 2474 | if (ret) { |
| 2475 | mlog_errno(ret); |
| 2476 | goto out; |
| 2477 | } |
| 2478 | |
| 2479 | ret = ocfs2_calc_refcount_meta_credits(inode->i_sb, |
| 2480 | &tree->rf_ci, |
| 2481 | ref_root_bh, |
| 2482 | start_cpos, clusters, |
| 2483 | &ref_blocks, credits); |
| 2484 | if (ret) { |
| 2485 | mlog_errno(ret); |
| 2486 | goto out; |
| 2487 | } |
| 2488 | |
| 2489 | mlog(0, "reserve new metadata %d, credits = %d\n", |
| 2490 | ref_blocks, *credits); |
| 2491 | |
| 2492 | if (ref_blocks) { |
| 2493 | ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb), |
| 2494 | ref_blocks, meta_ac); |
| 2495 | if (ret) |
| 2496 | mlog_errno(ret); |
| 2497 | } |
| 2498 | |
| 2499 | out: |
| 2500 | brelse(ref_root_bh); |
| 2501 | return ret; |
| 2502 | } |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2503 | |
| 2504 | #define MAX_CONTIG_BYTES 1048576 |
| 2505 | |
| 2506 | static inline unsigned int ocfs2_cow_contig_clusters(struct super_block *sb) |
| 2507 | { |
| 2508 | return ocfs2_clusters_for_bytes(sb, MAX_CONTIG_BYTES); |
| 2509 | } |
| 2510 | |
| 2511 | static inline unsigned int ocfs2_cow_contig_mask(struct super_block *sb) |
| 2512 | { |
| 2513 | return ~(ocfs2_cow_contig_clusters(sb) - 1); |
| 2514 | } |
| 2515 | |
| 2516 | /* |
| 2517 | * Given an extent that starts at 'start' and an I/O that starts at 'cpos', |
| 2518 | * find an offset (start + (n * contig_clusters)) that is closest to cpos |
| 2519 | * while still being less than or equal to it. |
| 2520 | * |
| 2521 | * The goal is to break the extent at a multiple of contig_clusters. |
| 2522 | */ |
| 2523 | static inline unsigned int ocfs2_cow_align_start(struct super_block *sb, |
| 2524 | unsigned int start, |
| 2525 | unsigned int cpos) |
| 2526 | { |
| 2527 | BUG_ON(start > cpos); |
| 2528 | |
| 2529 | return start + ((cpos - start) & ocfs2_cow_contig_mask(sb)); |
| 2530 | } |
| 2531 | |
| 2532 | /* |
| 2533 | * Given a cluster count of len, pad it out so that it is a multiple |
| 2534 | * of contig_clusters. |
| 2535 | */ |
| 2536 | static inline unsigned int ocfs2_cow_align_length(struct super_block *sb, |
| 2537 | unsigned int len) |
| 2538 | { |
| 2539 | unsigned int padded = |
| 2540 | (len + (ocfs2_cow_contig_clusters(sb) - 1)) & |
| 2541 | ocfs2_cow_contig_mask(sb); |
| 2542 | |
| 2543 | /* Did we wrap? */ |
| 2544 | if (padded < len) |
| 2545 | padded = UINT_MAX; |
| 2546 | |
| 2547 | return padded; |
| 2548 | } |
| 2549 | |
| 2550 | /* |
| 2551 | * Calculate out the start and number of virtual clusters we need to to CoW. |
| 2552 | * |
| 2553 | * cpos is vitual start cluster position we want to do CoW in a |
| 2554 | * file and write_len is the cluster length. |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 2555 | * max_cpos is the place where we want to stop CoW intentionally. |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2556 | * |
| 2557 | * Normal we will start CoW from the beginning of extent record cotaining cpos. |
| 2558 | * We try to break up extents on boundaries of MAX_CONTIG_BYTES so that we |
| 2559 | * get good I/O from the resulting extent tree. |
| 2560 | */ |
| 2561 | static int ocfs2_refcount_cal_cow_clusters(struct inode *inode, |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 2562 | struct ocfs2_extent_list *el, |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2563 | u32 cpos, |
| 2564 | u32 write_len, |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 2565 | u32 max_cpos, |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2566 | u32 *cow_start, |
| 2567 | u32 *cow_len) |
| 2568 | { |
| 2569 | int ret = 0; |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2570 | int tree_height = le16_to_cpu(el->l_tree_depth), i; |
| 2571 | struct buffer_head *eb_bh = NULL; |
| 2572 | struct ocfs2_extent_block *eb = NULL; |
| 2573 | struct ocfs2_extent_rec *rec; |
| 2574 | unsigned int want_clusters, rec_end = 0; |
| 2575 | int contig_clusters = ocfs2_cow_contig_clusters(inode->i_sb); |
| 2576 | int leaf_clusters; |
| 2577 | |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 2578 | BUG_ON(cpos + write_len > max_cpos); |
| 2579 | |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2580 | if (tree_height > 0) { |
| 2581 | ret = ocfs2_find_leaf(INODE_CACHE(inode), el, cpos, &eb_bh); |
| 2582 | if (ret) { |
| 2583 | mlog_errno(ret); |
| 2584 | goto out; |
| 2585 | } |
| 2586 | |
| 2587 | eb = (struct ocfs2_extent_block *) eb_bh->b_data; |
| 2588 | el = &eb->h_list; |
| 2589 | |
| 2590 | if (el->l_tree_depth) { |
| 2591 | ocfs2_error(inode->i_sb, |
| 2592 | "Inode %lu has non zero tree depth in " |
| 2593 | "leaf block %llu\n", inode->i_ino, |
| 2594 | (unsigned long long)eb_bh->b_blocknr); |
| 2595 | ret = -EROFS; |
| 2596 | goto out; |
| 2597 | } |
| 2598 | } |
| 2599 | |
| 2600 | *cow_len = 0; |
| 2601 | for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) { |
| 2602 | rec = &el->l_recs[i]; |
| 2603 | |
| 2604 | if (ocfs2_is_empty_extent(rec)) { |
| 2605 | mlog_bug_on_msg(i != 0, "Inode %lu has empty record in " |
| 2606 | "index %d\n", inode->i_ino, i); |
| 2607 | continue; |
| 2608 | } |
| 2609 | |
| 2610 | if (le32_to_cpu(rec->e_cpos) + |
| 2611 | le16_to_cpu(rec->e_leaf_clusters) <= cpos) |
| 2612 | continue; |
| 2613 | |
| 2614 | if (*cow_len == 0) { |
| 2615 | /* |
| 2616 | * We should find a refcounted record in the |
| 2617 | * first pass. |
| 2618 | */ |
| 2619 | BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED)); |
| 2620 | *cow_start = le32_to_cpu(rec->e_cpos); |
| 2621 | } |
| 2622 | |
| 2623 | /* |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 2624 | * If we encounter a hole, a non-refcounted record or |
| 2625 | * pass the max_cpos, stop the search. |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2626 | */ |
| 2627 | if ((!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) || |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 2628 | (*cow_len && rec_end != le32_to_cpu(rec->e_cpos)) || |
| 2629 | (max_cpos <= le32_to_cpu(rec->e_cpos))) |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2630 | break; |
| 2631 | |
| 2632 | leaf_clusters = le16_to_cpu(rec->e_leaf_clusters); |
| 2633 | rec_end = le32_to_cpu(rec->e_cpos) + leaf_clusters; |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 2634 | if (rec_end > max_cpos) { |
| 2635 | rec_end = max_cpos; |
| 2636 | leaf_clusters = rec_end - le32_to_cpu(rec->e_cpos); |
| 2637 | } |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2638 | |
| 2639 | /* |
| 2640 | * How many clusters do we actually need from |
| 2641 | * this extent? First we see how many we actually |
| 2642 | * need to complete the write. If that's smaller |
| 2643 | * than contig_clusters, we try for contig_clusters. |
| 2644 | */ |
| 2645 | if (!*cow_len) |
| 2646 | want_clusters = write_len; |
| 2647 | else |
| 2648 | want_clusters = (cpos + write_len) - |
| 2649 | (*cow_start + *cow_len); |
| 2650 | if (want_clusters < contig_clusters) |
| 2651 | want_clusters = contig_clusters; |
| 2652 | |
| 2653 | /* |
| 2654 | * If the write does not cover the whole extent, we |
| 2655 | * need to calculate how we're going to split the extent. |
| 2656 | * We try to do it on contig_clusters boundaries. |
| 2657 | * |
| 2658 | * Any extent smaller than contig_clusters will be |
| 2659 | * CoWed in its entirety. |
| 2660 | */ |
| 2661 | if (leaf_clusters <= contig_clusters) |
| 2662 | *cow_len += leaf_clusters; |
| 2663 | else if (*cow_len || (*cow_start == cpos)) { |
| 2664 | /* |
| 2665 | * This extent needs to be CoW'd from its |
| 2666 | * beginning, so all we have to do is compute |
| 2667 | * how many clusters to grab. We align |
| 2668 | * want_clusters to the edge of contig_clusters |
| 2669 | * to get better I/O. |
| 2670 | */ |
| 2671 | want_clusters = ocfs2_cow_align_length(inode->i_sb, |
| 2672 | want_clusters); |
| 2673 | |
| 2674 | if (leaf_clusters < want_clusters) |
| 2675 | *cow_len += leaf_clusters; |
| 2676 | else |
| 2677 | *cow_len += want_clusters; |
| 2678 | } else if ((*cow_start + contig_clusters) >= |
| 2679 | (cpos + write_len)) { |
| 2680 | /* |
| 2681 | * Breaking off contig_clusters at the front |
| 2682 | * of the extent will cover our write. That's |
| 2683 | * easy. |
| 2684 | */ |
| 2685 | *cow_len = contig_clusters; |
| 2686 | } else if ((rec_end - cpos) <= contig_clusters) { |
| 2687 | /* |
| 2688 | * Breaking off contig_clusters at the tail of |
| 2689 | * this extent will cover cpos. |
| 2690 | */ |
| 2691 | *cow_start = rec_end - contig_clusters; |
| 2692 | *cow_len = contig_clusters; |
| 2693 | } else if ((rec_end - cpos) <= want_clusters) { |
| 2694 | /* |
| 2695 | * While we can't fit the entire write in this |
| 2696 | * extent, we know that the write goes from cpos |
| 2697 | * to the end of the extent. Break that off. |
| 2698 | * We try to break it at some multiple of |
| 2699 | * contig_clusters from the front of the extent. |
| 2700 | * Failing that (ie, cpos is within |
| 2701 | * contig_clusters of the front), we'll CoW the |
| 2702 | * entire extent. |
| 2703 | */ |
| 2704 | *cow_start = ocfs2_cow_align_start(inode->i_sb, |
| 2705 | *cow_start, cpos); |
| 2706 | *cow_len = rec_end - *cow_start; |
| 2707 | } else { |
| 2708 | /* |
| 2709 | * Ok, the entire write lives in the middle of |
| 2710 | * this extent. Let's try to slice the extent up |
| 2711 | * nicely. Optimally, our CoW region starts at |
| 2712 | * m*contig_clusters from the beginning of the |
| 2713 | * extent and goes for n*contig_clusters, |
| 2714 | * covering the entire write. |
| 2715 | */ |
| 2716 | *cow_start = ocfs2_cow_align_start(inode->i_sb, |
| 2717 | *cow_start, cpos); |
| 2718 | |
| 2719 | want_clusters = (cpos + write_len) - *cow_start; |
| 2720 | want_clusters = ocfs2_cow_align_length(inode->i_sb, |
| 2721 | want_clusters); |
| 2722 | if (*cow_start + want_clusters <= rec_end) |
| 2723 | *cow_len = want_clusters; |
| 2724 | else |
| 2725 | *cow_len = rec_end - *cow_start; |
| 2726 | } |
| 2727 | |
| 2728 | /* Have we covered our entire write yet? */ |
| 2729 | if ((*cow_start + *cow_len) >= (cpos + write_len)) |
| 2730 | break; |
| 2731 | |
| 2732 | /* |
| 2733 | * If we reach the end of the extent block and don't get enough |
| 2734 | * clusters, continue with the next extent block if possible. |
| 2735 | */ |
| 2736 | if (i + 1 == le16_to_cpu(el->l_next_free_rec) && |
| 2737 | eb && eb->h_next_leaf_blk) { |
| 2738 | brelse(eb_bh); |
| 2739 | eb_bh = NULL; |
| 2740 | |
| 2741 | ret = ocfs2_read_extent_block(INODE_CACHE(inode), |
| 2742 | le64_to_cpu(eb->h_next_leaf_blk), |
| 2743 | &eb_bh); |
| 2744 | if (ret) { |
| 2745 | mlog_errno(ret); |
| 2746 | goto out; |
| 2747 | } |
| 2748 | |
| 2749 | eb = (struct ocfs2_extent_block *) eb_bh->b_data; |
| 2750 | el = &eb->h_list; |
| 2751 | i = -1; |
| 2752 | } |
| 2753 | } |
| 2754 | |
| 2755 | out: |
| 2756 | brelse(eb_bh); |
| 2757 | return ret; |
| 2758 | } |
| 2759 | |
| 2760 | /* |
| 2761 | * Prepare meta_ac, data_ac and calculate credits when we want to add some |
| 2762 | * num_clusters in data_tree "et" and change the refcount for the old |
| 2763 | * clusters(starting form p_cluster) in the refcount tree. |
| 2764 | * |
| 2765 | * Note: |
| 2766 | * 1. since we may split the old tree, so we at most will need num_clusters + 2 |
| 2767 | * more new leaf records. |
| 2768 | * 2. In some case, we may not need to reserve new clusters(e.g, reflink), so |
| 2769 | * just give data_ac = NULL. |
| 2770 | */ |
| 2771 | static int ocfs2_lock_refcount_allocators(struct super_block *sb, |
| 2772 | u32 p_cluster, u32 num_clusters, |
| 2773 | struct ocfs2_extent_tree *et, |
| 2774 | struct ocfs2_caching_info *ref_ci, |
| 2775 | struct buffer_head *ref_root_bh, |
| 2776 | struct ocfs2_alloc_context **meta_ac, |
| 2777 | struct ocfs2_alloc_context **data_ac, |
| 2778 | int *credits) |
| 2779 | { |
| 2780 | int ret = 0, meta_add = 0; |
| 2781 | int num_free_extents = ocfs2_num_free_extents(OCFS2_SB(sb), et); |
| 2782 | |
| 2783 | if (num_free_extents < 0) { |
| 2784 | ret = num_free_extents; |
| 2785 | mlog_errno(ret); |
| 2786 | goto out; |
| 2787 | } |
| 2788 | |
| 2789 | if (num_free_extents < num_clusters + 2) |
| 2790 | meta_add = |
| 2791 | ocfs2_extend_meta_needed(et->et_root_el); |
| 2792 | |
| 2793 | *credits += ocfs2_calc_extend_credits(sb, et->et_root_el, |
| 2794 | num_clusters + 2); |
| 2795 | |
| 2796 | ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh, |
| 2797 | p_cluster, num_clusters, |
| 2798 | &meta_add, credits); |
| 2799 | if (ret) { |
| 2800 | mlog_errno(ret); |
| 2801 | goto out; |
| 2802 | } |
| 2803 | |
| 2804 | mlog(0, "reserve new metadata %d, clusters %u, credits = %d\n", |
| 2805 | meta_add, num_clusters, *credits); |
| 2806 | ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(sb), meta_add, |
| 2807 | meta_ac); |
| 2808 | if (ret) { |
| 2809 | mlog_errno(ret); |
| 2810 | goto out; |
| 2811 | } |
| 2812 | |
| 2813 | if (data_ac) { |
| 2814 | ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters, |
| 2815 | data_ac); |
| 2816 | if (ret) |
| 2817 | mlog_errno(ret); |
| 2818 | } |
| 2819 | |
| 2820 | out: |
| 2821 | if (ret) { |
| 2822 | if (*meta_ac) { |
| 2823 | ocfs2_free_alloc_context(*meta_ac); |
| 2824 | *meta_ac = NULL; |
| 2825 | } |
| 2826 | } |
| 2827 | |
| 2828 | return ret; |
| 2829 | } |
| 2830 | |
| 2831 | static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh) |
| 2832 | { |
| 2833 | BUG_ON(buffer_dirty(bh)); |
| 2834 | |
| 2835 | clear_buffer_mapped(bh); |
| 2836 | |
| 2837 | return 0; |
| 2838 | } |
| 2839 | |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 2840 | static int ocfs2_duplicate_clusters_by_page(handle_t *handle, |
| 2841 | struct ocfs2_cow_context *context, |
| 2842 | u32 cpos, u32 old_cluster, |
| 2843 | u32 new_cluster, u32 new_len) |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2844 | { |
| 2845 | int ret = 0, partial; |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 2846 | struct ocfs2_caching_info *ci = context->data_et.et_ci; |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2847 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); |
| 2848 | u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster); |
| 2849 | struct page *page; |
| 2850 | pgoff_t page_index; |
| 2851 | unsigned int from, to; |
| 2852 | loff_t offset, end, map_end; |
| 2853 | struct address_space *mapping = context->inode->i_mapping; |
| 2854 | |
| 2855 | mlog(0, "old_cluster %u, new %u, len %u at offset %u\n", old_cluster, |
| 2856 | new_cluster, new_len, cpos); |
| 2857 | |
| 2858 | offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits; |
| 2859 | end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits); |
| 2860 | |
| 2861 | while (offset < end) { |
| 2862 | page_index = offset >> PAGE_CACHE_SHIFT; |
| 2863 | map_end = (page_index + 1) << PAGE_CACHE_SHIFT; |
| 2864 | if (map_end > end) |
| 2865 | map_end = end; |
| 2866 | |
| 2867 | /* from, to is the offset within the page. */ |
| 2868 | from = offset & (PAGE_CACHE_SIZE - 1); |
| 2869 | to = PAGE_CACHE_SIZE; |
| 2870 | if (map_end & (PAGE_CACHE_SIZE - 1)) |
| 2871 | to = map_end & (PAGE_CACHE_SIZE - 1); |
| 2872 | |
| 2873 | page = grab_cache_page(mapping, page_index); |
| 2874 | |
| 2875 | /* This page can't be dirtied before we CoW it out. */ |
| 2876 | BUG_ON(PageDirty(page)); |
| 2877 | |
| 2878 | if (!PageUptodate(page)) { |
| 2879 | ret = block_read_full_page(page, ocfs2_get_block); |
| 2880 | if (ret) { |
| 2881 | mlog_errno(ret); |
| 2882 | goto unlock; |
| 2883 | } |
| 2884 | lock_page(page); |
| 2885 | } |
| 2886 | |
| 2887 | if (page_has_buffers(page)) { |
| 2888 | ret = walk_page_buffers(handle, page_buffers(page), |
| 2889 | from, to, &partial, |
| 2890 | ocfs2_clear_cow_buffer); |
| 2891 | if (ret) { |
| 2892 | mlog_errno(ret); |
| 2893 | goto unlock; |
| 2894 | } |
| 2895 | } |
| 2896 | |
| 2897 | ocfs2_map_and_dirty_page(context->inode, |
| 2898 | handle, from, to, |
| 2899 | page, 0, &new_block); |
| 2900 | mark_page_accessed(page); |
| 2901 | unlock: |
| 2902 | unlock_page(page); |
| 2903 | page_cache_release(page); |
| 2904 | page = NULL; |
| 2905 | offset = map_end; |
| 2906 | if (ret) |
| 2907 | break; |
| 2908 | } |
| 2909 | |
| 2910 | return ret; |
| 2911 | } |
| 2912 | |
Tao Ma | 492a8a3 | 2009-08-18 11:43:17 +0800 | [diff] [blame] | 2913 | static int ocfs2_duplicate_clusters_by_jbd(handle_t *handle, |
| 2914 | struct ocfs2_cow_context *context, |
| 2915 | u32 cpos, u32 old_cluster, |
| 2916 | u32 new_cluster, u32 new_len) |
| 2917 | { |
| 2918 | int ret = 0; |
| 2919 | struct super_block *sb = context->inode->i_sb; |
| 2920 | struct ocfs2_caching_info *ci = context->data_et.et_ci; |
| 2921 | int i, blocks = ocfs2_clusters_to_blocks(sb, new_len); |
| 2922 | u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster); |
| 2923 | u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster); |
| 2924 | struct ocfs2_super *osb = OCFS2_SB(sb); |
| 2925 | struct buffer_head *old_bh = NULL; |
| 2926 | struct buffer_head *new_bh = NULL; |
| 2927 | |
| 2928 | mlog(0, "old_cluster %u, new %u, len %u\n", old_cluster, |
| 2929 | new_cluster, new_len); |
| 2930 | |
| 2931 | for (i = 0; i < blocks; i++, old_block++, new_block++) { |
| 2932 | new_bh = sb_getblk(osb->sb, new_block); |
| 2933 | if (new_bh == NULL) { |
| 2934 | ret = -EIO; |
| 2935 | mlog_errno(ret); |
| 2936 | break; |
| 2937 | } |
| 2938 | |
| 2939 | ocfs2_set_new_buffer_uptodate(ci, new_bh); |
| 2940 | |
| 2941 | ret = ocfs2_read_block(ci, old_block, &old_bh, NULL); |
| 2942 | if (ret) { |
| 2943 | mlog_errno(ret); |
| 2944 | break; |
| 2945 | } |
| 2946 | |
| 2947 | ret = ocfs2_journal_access(handle, ci, new_bh, |
| 2948 | OCFS2_JOURNAL_ACCESS_CREATE); |
| 2949 | if (ret) { |
| 2950 | mlog_errno(ret); |
| 2951 | break; |
| 2952 | } |
| 2953 | |
| 2954 | memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize); |
| 2955 | ret = ocfs2_journal_dirty(handle, new_bh); |
| 2956 | if (ret) { |
| 2957 | mlog_errno(ret); |
| 2958 | break; |
| 2959 | } |
| 2960 | |
| 2961 | brelse(new_bh); |
| 2962 | brelse(old_bh); |
| 2963 | new_bh = NULL; |
| 2964 | old_bh = NULL; |
| 2965 | } |
| 2966 | |
| 2967 | brelse(new_bh); |
| 2968 | brelse(old_bh); |
| 2969 | return ret; |
| 2970 | } |
| 2971 | |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 2972 | static int ocfs2_clear_ext_refcount(handle_t *handle, |
| 2973 | struct ocfs2_extent_tree *et, |
| 2974 | u32 cpos, u32 p_cluster, u32 len, |
| 2975 | unsigned int ext_flags, |
| 2976 | struct ocfs2_alloc_context *meta_ac, |
| 2977 | struct ocfs2_cached_dealloc_ctxt *dealloc) |
| 2978 | { |
| 2979 | int ret, index; |
| 2980 | struct ocfs2_extent_rec replace_rec; |
| 2981 | struct ocfs2_path *path = NULL; |
| 2982 | struct ocfs2_extent_list *el; |
| 2983 | struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci); |
| 2984 | u64 ino = ocfs2_metadata_cache_owner(et->et_ci); |
| 2985 | |
| 2986 | mlog(0, "inode %llu cpos %u, len %u, p_cluster %u, ext_flags %u\n", |
| 2987 | (unsigned long long)ino, cpos, len, p_cluster, ext_flags); |
| 2988 | |
| 2989 | memset(&replace_rec, 0, sizeof(replace_rec)); |
| 2990 | replace_rec.e_cpos = cpu_to_le32(cpos); |
| 2991 | replace_rec.e_leaf_clusters = cpu_to_le16(len); |
| 2992 | replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(sb, |
| 2993 | p_cluster)); |
| 2994 | replace_rec.e_flags = ext_flags; |
| 2995 | replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED; |
| 2996 | |
| 2997 | path = ocfs2_new_path_from_et(et); |
| 2998 | if (!path) { |
| 2999 | ret = -ENOMEM; |
| 3000 | mlog_errno(ret); |
| 3001 | goto out; |
| 3002 | } |
| 3003 | |
| 3004 | ret = ocfs2_find_path(et->et_ci, path, cpos); |
| 3005 | if (ret) { |
| 3006 | mlog_errno(ret); |
| 3007 | goto out; |
| 3008 | } |
| 3009 | |
| 3010 | el = path_leaf_el(path); |
| 3011 | |
| 3012 | index = ocfs2_search_extent_list(el, cpos); |
| 3013 | if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) { |
| 3014 | ocfs2_error(sb, |
| 3015 | "Inode %llu has an extent at cpos %u which can no " |
| 3016 | "longer be found.\n", |
| 3017 | (unsigned long long)ino, cpos); |
| 3018 | ret = -EROFS; |
| 3019 | goto out; |
| 3020 | } |
| 3021 | |
| 3022 | ret = ocfs2_split_extent(handle, et, path, index, |
| 3023 | &replace_rec, meta_ac, dealloc); |
| 3024 | if (ret) |
| 3025 | mlog_errno(ret); |
| 3026 | |
| 3027 | out: |
| 3028 | ocfs2_free_path(path); |
| 3029 | return ret; |
| 3030 | } |
| 3031 | |
| 3032 | static int ocfs2_replace_clusters(handle_t *handle, |
| 3033 | struct ocfs2_cow_context *context, |
| 3034 | u32 cpos, u32 old, |
| 3035 | u32 new, u32 len, |
| 3036 | unsigned int ext_flags) |
| 3037 | { |
| 3038 | int ret; |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3039 | struct ocfs2_caching_info *ci = context->data_et.et_ci; |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3040 | u64 ino = ocfs2_metadata_cache_owner(ci); |
| 3041 | |
| 3042 | mlog(0, "inode %llu, cpos %u, old %u, new %u, len %u, ext_flags %u\n", |
| 3043 | (unsigned long long)ino, cpos, old, new, len, ext_flags); |
| 3044 | |
| 3045 | /*If the old clusters is unwritten, no need to duplicate. */ |
| 3046 | if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) { |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3047 | ret = context->cow_duplicate_clusters(handle, context, cpos, |
| 3048 | old, new, len); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3049 | if (ret) { |
| 3050 | mlog_errno(ret); |
| 3051 | goto out; |
| 3052 | } |
| 3053 | } |
| 3054 | |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3055 | ret = ocfs2_clear_ext_refcount(handle, &context->data_et, |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3056 | cpos, new, len, ext_flags, |
| 3057 | context->meta_ac, &context->dealloc); |
| 3058 | if (ret) |
| 3059 | mlog_errno(ret); |
| 3060 | out: |
| 3061 | return ret; |
| 3062 | } |
| 3063 | |
| 3064 | static int ocfs2_cow_sync_writeback(struct super_block *sb, |
| 3065 | struct ocfs2_cow_context *context, |
| 3066 | u32 cpos, u32 num_clusters) |
| 3067 | { |
| 3068 | int ret = 0; |
| 3069 | loff_t offset, end, map_end; |
| 3070 | pgoff_t page_index; |
| 3071 | struct page *page; |
| 3072 | |
| 3073 | if (ocfs2_should_order_data(context->inode)) |
| 3074 | return 0; |
| 3075 | |
| 3076 | offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits; |
| 3077 | end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits); |
| 3078 | |
| 3079 | ret = filemap_fdatawrite_range(context->inode->i_mapping, |
| 3080 | offset, end - 1); |
| 3081 | if (ret < 0) { |
| 3082 | mlog_errno(ret); |
| 3083 | return ret; |
| 3084 | } |
| 3085 | |
| 3086 | while (offset < end) { |
| 3087 | page_index = offset >> PAGE_CACHE_SHIFT; |
| 3088 | map_end = (page_index + 1) << PAGE_CACHE_SHIFT; |
| 3089 | if (map_end > end) |
| 3090 | map_end = end; |
| 3091 | |
| 3092 | page = grab_cache_page(context->inode->i_mapping, page_index); |
| 3093 | BUG_ON(!page); |
| 3094 | |
| 3095 | wait_on_page_writeback(page); |
| 3096 | if (PageError(page)) { |
| 3097 | ret = -EIO; |
| 3098 | mlog_errno(ret); |
| 3099 | } else |
| 3100 | mark_page_accessed(page); |
| 3101 | |
| 3102 | unlock_page(page); |
| 3103 | page_cache_release(page); |
| 3104 | page = NULL; |
| 3105 | offset = map_end; |
| 3106 | if (ret) |
| 3107 | break; |
| 3108 | } |
| 3109 | |
| 3110 | return ret; |
| 3111 | } |
| 3112 | |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3113 | static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context, |
| 3114 | u32 v_cluster, u32 *p_cluster, |
| 3115 | u32 *num_clusters, |
| 3116 | unsigned int *extent_flags) |
| 3117 | { |
| 3118 | return ocfs2_get_clusters(context->inode, v_cluster, p_cluster, |
| 3119 | num_clusters, extent_flags); |
| 3120 | } |
| 3121 | |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3122 | static int ocfs2_make_clusters_writable(struct super_block *sb, |
| 3123 | struct ocfs2_cow_context *context, |
| 3124 | u32 cpos, u32 p_cluster, |
| 3125 | u32 num_clusters, unsigned int e_flags) |
| 3126 | { |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 3127 | int ret, delete, index, credits = 0; |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3128 | u32 new_bit, new_len; |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 3129 | unsigned int set_len; |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3130 | struct ocfs2_super *osb = OCFS2_SB(sb); |
| 3131 | handle_t *handle; |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 3132 | struct buffer_head *ref_leaf_bh = NULL; |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3133 | struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci; |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 3134 | struct ocfs2_refcount_rec rec; |
| 3135 | |
| 3136 | mlog(0, "cpos %u, p_cluster %u, num_clusters %u, e_flags %u\n", |
| 3137 | cpos, p_cluster, num_clusters, e_flags); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3138 | |
| 3139 | ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters, |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3140 | &context->data_et, |
| 3141 | ref_ci, |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3142 | context->ref_root_bh, |
| 3143 | &context->meta_ac, |
| 3144 | &context->data_ac, &credits); |
| 3145 | if (ret) { |
| 3146 | mlog_errno(ret); |
| 3147 | return ret; |
| 3148 | } |
| 3149 | |
Tao Ma | 492a8a3 | 2009-08-18 11:43:17 +0800 | [diff] [blame] | 3150 | if (context->post_refcount) |
| 3151 | credits += context->post_refcount->credits; |
| 3152 | |
| 3153 | credits += context->extra_credits; |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3154 | handle = ocfs2_start_trans(osb, credits); |
| 3155 | if (IS_ERR(handle)) { |
| 3156 | ret = PTR_ERR(handle); |
| 3157 | mlog_errno(ret); |
| 3158 | goto out; |
| 3159 | } |
| 3160 | |
| 3161 | while (num_clusters) { |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3162 | ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh, |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 3163 | p_cluster, num_clusters, |
| 3164 | &rec, &index, &ref_leaf_bh); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3165 | if (ret) { |
| 3166 | mlog_errno(ret); |
| 3167 | goto out_commit; |
| 3168 | } |
| 3169 | |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 3170 | BUG_ON(!rec.r_refcount); |
| 3171 | set_len = min((u64)p_cluster + num_clusters, |
| 3172 | le64_to_cpu(rec.r_cpos) + |
| 3173 | le32_to_cpu(rec.r_clusters)) - p_cluster; |
| 3174 | |
| 3175 | /* |
| 3176 | * There are many different situation here. |
| 3177 | * 1. If refcount == 1, remove the flag and don't COW. |
| 3178 | * 2. If refcount > 1, allocate clusters. |
| 3179 | * Here we may not allocate r_len once at a time, so continue |
| 3180 | * until we reach num_clusters. |
| 3181 | */ |
| 3182 | if (le32_to_cpu(rec.r_refcount) == 1) { |
| 3183 | delete = 0; |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3184 | ret = ocfs2_clear_ext_refcount(handle, |
| 3185 | &context->data_et, |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 3186 | cpos, p_cluster, |
| 3187 | set_len, e_flags, |
| 3188 | context->meta_ac, |
| 3189 | &context->dealloc); |
| 3190 | if (ret) { |
| 3191 | mlog_errno(ret); |
| 3192 | goto out_commit; |
| 3193 | } |
| 3194 | } else { |
| 3195 | delete = 1; |
| 3196 | |
| 3197 | ret = __ocfs2_claim_clusters(osb, handle, |
| 3198 | context->data_ac, |
| 3199 | 1, set_len, |
| 3200 | &new_bit, &new_len); |
| 3201 | if (ret) { |
| 3202 | mlog_errno(ret); |
| 3203 | goto out_commit; |
| 3204 | } |
| 3205 | |
| 3206 | ret = ocfs2_replace_clusters(handle, context, |
| 3207 | cpos, p_cluster, new_bit, |
| 3208 | new_len, e_flags); |
| 3209 | if (ret) { |
| 3210 | mlog_errno(ret); |
| 3211 | goto out_commit; |
| 3212 | } |
| 3213 | set_len = new_len; |
| 3214 | } |
| 3215 | |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3216 | ret = __ocfs2_decrease_refcount(handle, ref_ci, |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 3217 | context->ref_root_bh, |
| 3218 | p_cluster, set_len, |
| 3219 | context->meta_ac, |
| 3220 | &context->dealloc, delete); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3221 | if (ret) { |
| 3222 | mlog_errno(ret); |
| 3223 | goto out_commit; |
| 3224 | } |
| 3225 | |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 3226 | cpos += set_len; |
| 3227 | p_cluster += set_len; |
| 3228 | num_clusters -= set_len; |
| 3229 | brelse(ref_leaf_bh); |
| 3230 | ref_leaf_bh = NULL; |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3231 | } |
| 3232 | |
Tao Ma | 492a8a3 | 2009-08-18 11:43:17 +0800 | [diff] [blame] | 3233 | /* handle any post_cow action. */ |
| 3234 | if (context->post_refcount && context->post_refcount->func) { |
| 3235 | ret = context->post_refcount->func(context->inode, handle, |
| 3236 | context->post_refcount->para); |
| 3237 | if (ret) { |
| 3238 | mlog_errno(ret); |
| 3239 | goto out_commit; |
| 3240 | } |
| 3241 | } |
| 3242 | |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3243 | /* |
| 3244 | * Here we should write the new page out first if we are |
| 3245 | * in write-back mode. |
| 3246 | */ |
Tao Ma | 492a8a3 | 2009-08-18 11:43:17 +0800 | [diff] [blame] | 3247 | if (context->get_clusters == ocfs2_di_get_clusters) { |
| 3248 | ret = ocfs2_cow_sync_writeback(sb, context, cpos, num_clusters); |
| 3249 | if (ret) |
| 3250 | mlog_errno(ret); |
| 3251 | } |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3252 | |
| 3253 | out_commit: |
| 3254 | ocfs2_commit_trans(osb, handle); |
| 3255 | |
| 3256 | out: |
| 3257 | if (context->data_ac) { |
| 3258 | ocfs2_free_alloc_context(context->data_ac); |
| 3259 | context->data_ac = NULL; |
| 3260 | } |
| 3261 | if (context->meta_ac) { |
| 3262 | ocfs2_free_alloc_context(context->meta_ac); |
| 3263 | context->meta_ac = NULL; |
| 3264 | } |
Tao Ma | 6ae23c5 | 2009-08-18 11:30:55 +0800 | [diff] [blame] | 3265 | brelse(ref_leaf_bh); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3266 | |
| 3267 | return ret; |
| 3268 | } |
| 3269 | |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3270 | static int ocfs2_replace_cow(struct ocfs2_cow_context *context) |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3271 | { |
| 3272 | int ret = 0; |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3273 | struct inode *inode = context->inode; |
| 3274 | u32 cow_start = context->cow_start, cow_len = context->cow_len; |
| 3275 | u32 p_cluster, num_clusters; |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3276 | unsigned int ext_flags; |
| 3277 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3278 | |
| 3279 | if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) { |
| 3280 | ocfs2_error(inode->i_sb, "Inode %lu want to use refcount " |
| 3281 | "tree, but the feature bit is not set in the " |
| 3282 | "super block.", inode->i_ino); |
| 3283 | return -EROFS; |
| 3284 | } |
| 3285 | |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3286 | ocfs2_init_dealloc_ctxt(&context->dealloc); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3287 | |
| 3288 | while (cow_len) { |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3289 | ret = context->get_clusters(context, cow_start, &p_cluster, |
| 3290 | &num_clusters, &ext_flags); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3291 | if (ret) { |
| 3292 | mlog_errno(ret); |
| 3293 | break; |
| 3294 | } |
| 3295 | |
| 3296 | BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED)); |
| 3297 | |
| 3298 | if (cow_len < num_clusters) |
| 3299 | num_clusters = cow_len; |
| 3300 | |
| 3301 | ret = ocfs2_make_clusters_writable(inode->i_sb, context, |
| 3302 | cow_start, p_cluster, |
| 3303 | num_clusters, ext_flags); |
| 3304 | if (ret) { |
| 3305 | mlog_errno(ret); |
| 3306 | break; |
| 3307 | } |
| 3308 | |
| 3309 | cow_len -= num_clusters; |
| 3310 | cow_start += num_clusters; |
| 3311 | } |
| 3312 | |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3313 | if (ocfs2_dealloc_has_cluster(&context->dealloc)) { |
| 3314 | ocfs2_schedule_truncate_log_flush(osb, 1); |
| 3315 | ocfs2_run_deallocs(osb, &context->dealloc); |
| 3316 | } |
| 3317 | |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3318 | return ret; |
| 3319 | } |
| 3320 | |
| 3321 | /* |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 3322 | * Starting at cpos, try to CoW write_len clusters. Don't CoW |
| 3323 | * past max_cpos. This will stop when it runs into a hole or an |
| 3324 | * unrefcounted extent. |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3325 | */ |
| 3326 | static int ocfs2_refcount_cow_hunk(struct inode *inode, |
| 3327 | struct buffer_head *di_bh, |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 3328 | u32 cpos, u32 write_len, u32 max_cpos) |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3329 | { |
| 3330 | int ret; |
| 3331 | u32 cow_start = 0, cow_len = 0; |
| 3332 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 3333 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 3334 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 3335 | struct buffer_head *ref_root_bh = NULL; |
| 3336 | struct ocfs2_refcount_tree *ref_tree; |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3337 | struct ocfs2_cow_context *context = NULL; |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3338 | |
| 3339 | BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); |
| 3340 | |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3341 | ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list, |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 3342 | cpos, write_len, max_cpos, |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3343 | &cow_start, &cow_len); |
| 3344 | if (ret) { |
| 3345 | mlog_errno(ret); |
| 3346 | goto out; |
| 3347 | } |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 3348 | |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3349 | mlog(0, "CoW inode %lu, cpos %u, write_len %u, cow_start %u, " |
| 3350 | "cow_len %u\n", inode->i_ino, |
| 3351 | cpos, write_len, cow_start, cow_len); |
| 3352 | |
| 3353 | BUG_ON(cow_len == 0); |
| 3354 | |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3355 | context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS); |
| 3356 | if (!context) { |
| 3357 | ret = -ENOMEM; |
| 3358 | mlog_errno(ret); |
| 3359 | goto out; |
| 3360 | } |
| 3361 | |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3362 | ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc), |
| 3363 | 1, &ref_tree, &ref_root_bh); |
| 3364 | if (ret) { |
| 3365 | mlog_errno(ret); |
| 3366 | goto out; |
| 3367 | } |
| 3368 | |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3369 | context->inode = inode; |
| 3370 | context->cow_start = cow_start; |
| 3371 | context->cow_len = cow_len; |
| 3372 | context->ref_tree = ref_tree; |
| 3373 | context->ref_root_bh = ref_root_bh; |
| 3374 | context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page; |
| 3375 | context->get_clusters = ocfs2_di_get_clusters; |
| 3376 | |
| 3377 | ocfs2_init_dinode_extent_tree(&context->data_et, |
| 3378 | INODE_CACHE(inode), di_bh); |
| 3379 | |
| 3380 | ret = ocfs2_replace_cow(context); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3381 | if (ret) |
| 3382 | mlog_errno(ret); |
| 3383 | |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3384 | /* |
| 3385 | * truncate the extent map here since no matter whether we meet with |
| 3386 | * any error during the action, we shouldn't trust cached extent map |
| 3387 | * any more. |
| 3388 | */ |
| 3389 | ocfs2_extent_map_trunc(inode, cow_start); |
| 3390 | |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3391 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); |
| 3392 | brelse(ref_root_bh); |
| 3393 | out: |
Tao Ma | 913580b | 2009-08-24 14:31:03 +0800 | [diff] [blame] | 3394 | kfree(context); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3395 | return ret; |
| 3396 | } |
| 3397 | |
| 3398 | /* |
| 3399 | * CoW any and all clusters between cpos and cpos+write_len. |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 3400 | * Don't CoW past max_cpos. If this returns successfully, all |
| 3401 | * clusters between cpos and cpos+write_len are safe to modify. |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3402 | */ |
| 3403 | int ocfs2_refcount_cow(struct inode *inode, |
| 3404 | struct buffer_head *di_bh, |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 3405 | u32 cpos, u32 write_len, u32 max_cpos) |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3406 | { |
| 3407 | int ret = 0; |
| 3408 | u32 p_cluster, num_clusters; |
| 3409 | unsigned int ext_flags; |
| 3410 | |
| 3411 | while (write_len) { |
| 3412 | ret = ocfs2_get_clusters(inode, cpos, &p_cluster, |
| 3413 | &num_clusters, &ext_flags); |
| 3414 | if (ret) { |
| 3415 | mlog_errno(ret); |
| 3416 | break; |
| 3417 | } |
| 3418 | |
| 3419 | if (write_len < num_clusters) |
| 3420 | num_clusters = write_len; |
| 3421 | |
| 3422 | if (ext_flags & OCFS2_EXT_REFCOUNTED) { |
| 3423 | ret = ocfs2_refcount_cow_hunk(inode, di_bh, cpos, |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 3424 | num_clusters, max_cpos); |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 3425 | if (ret) { |
| 3426 | mlog_errno(ret); |
| 3427 | break; |
| 3428 | } |
| 3429 | } |
| 3430 | |
| 3431 | write_len -= num_clusters; |
| 3432 | cpos += num_clusters; |
| 3433 | } |
| 3434 | |
| 3435 | return ret; |
| 3436 | } |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3437 | |
Tao Ma | 492a8a3 | 2009-08-18 11:43:17 +0800 | [diff] [blame] | 3438 | static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context, |
| 3439 | u32 v_cluster, u32 *p_cluster, |
| 3440 | u32 *num_clusters, |
| 3441 | unsigned int *extent_flags) |
| 3442 | { |
| 3443 | struct inode *inode = context->inode; |
| 3444 | struct ocfs2_xattr_value_root *xv = context->cow_object; |
| 3445 | |
| 3446 | return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster, |
| 3447 | num_clusters, &xv->xr_list, |
| 3448 | extent_flags); |
| 3449 | } |
| 3450 | |
| 3451 | /* |
| 3452 | * Given a xattr value root, calculate the most meta/credits we need for |
| 3453 | * refcount tree change if we truncate it to 0. |
| 3454 | */ |
| 3455 | int ocfs2_refcounted_xattr_delete_need(struct inode *inode, |
| 3456 | struct ocfs2_caching_info *ref_ci, |
| 3457 | struct buffer_head *ref_root_bh, |
| 3458 | struct ocfs2_xattr_value_root *xv, |
| 3459 | int *meta_add, int *credits) |
| 3460 | { |
| 3461 | int ret = 0, index, ref_blocks = 0; |
| 3462 | u32 p_cluster, num_clusters; |
| 3463 | u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters); |
| 3464 | struct ocfs2_refcount_block *rb; |
| 3465 | struct ocfs2_refcount_rec rec; |
| 3466 | struct buffer_head *ref_leaf_bh = NULL; |
| 3467 | |
| 3468 | while (cpos < clusters) { |
| 3469 | ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, |
| 3470 | &num_clusters, &xv->xr_list, |
| 3471 | NULL); |
| 3472 | if (ret) { |
| 3473 | mlog_errno(ret); |
| 3474 | goto out; |
| 3475 | } |
| 3476 | |
| 3477 | cpos += num_clusters; |
| 3478 | |
| 3479 | while (num_clusters) { |
| 3480 | ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh, |
| 3481 | p_cluster, num_clusters, |
| 3482 | &rec, &index, |
| 3483 | &ref_leaf_bh); |
| 3484 | if (ret) { |
| 3485 | mlog_errno(ret); |
| 3486 | goto out; |
| 3487 | } |
| 3488 | |
| 3489 | BUG_ON(!rec.r_refcount); |
| 3490 | |
| 3491 | rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; |
| 3492 | |
| 3493 | /* |
| 3494 | * We really don't know whether the other clusters is in |
| 3495 | * this refcount block or not, so just take the worst |
| 3496 | * case that all the clusters are in this block and each |
| 3497 | * one will split a refcount rec, so totally we need |
| 3498 | * clusters * 2 new refcount rec. |
| 3499 | */ |
| 3500 | if (le64_to_cpu(rb->rf_records.rl_used) + clusters * 2 > |
| 3501 | le16_to_cpu(rb->rf_records.rl_count)) |
| 3502 | ref_blocks++; |
| 3503 | |
| 3504 | *credits += 1; |
| 3505 | brelse(ref_leaf_bh); |
| 3506 | ref_leaf_bh = NULL; |
| 3507 | |
| 3508 | if (num_clusters <= le32_to_cpu(rec.r_clusters)) |
| 3509 | break; |
| 3510 | else |
| 3511 | num_clusters -= le32_to_cpu(rec.r_clusters); |
| 3512 | p_cluster += num_clusters; |
| 3513 | } |
| 3514 | } |
| 3515 | |
| 3516 | *meta_add += ref_blocks; |
| 3517 | if (!ref_blocks) |
| 3518 | goto out; |
| 3519 | |
| 3520 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; |
| 3521 | if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) |
| 3522 | *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS; |
| 3523 | else { |
| 3524 | struct ocfs2_extent_tree et; |
| 3525 | |
| 3526 | ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh); |
| 3527 | *credits += ocfs2_calc_extend_credits(inode->i_sb, |
| 3528 | et.et_root_el, |
| 3529 | ref_blocks); |
| 3530 | } |
| 3531 | |
| 3532 | out: |
| 3533 | brelse(ref_leaf_bh); |
| 3534 | return ret; |
| 3535 | } |
| 3536 | |
| 3537 | /* |
| 3538 | * Do CoW for xattr. |
| 3539 | */ |
| 3540 | int ocfs2_refcount_cow_xattr(struct inode *inode, |
| 3541 | struct ocfs2_dinode *di, |
| 3542 | struct ocfs2_xattr_value_buf *vb, |
| 3543 | struct ocfs2_refcount_tree *ref_tree, |
| 3544 | struct buffer_head *ref_root_bh, |
| 3545 | u32 cpos, u32 write_len, |
| 3546 | struct ocfs2_post_refcount *post) |
| 3547 | { |
| 3548 | int ret; |
| 3549 | struct ocfs2_xattr_value_root *xv = vb->vb_xv; |
| 3550 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 3551 | struct ocfs2_cow_context *context = NULL; |
| 3552 | u32 cow_start, cow_len; |
| 3553 | |
| 3554 | BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); |
| 3555 | |
| 3556 | ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list, |
| 3557 | cpos, write_len, UINT_MAX, |
| 3558 | &cow_start, &cow_len); |
| 3559 | if (ret) { |
| 3560 | mlog_errno(ret); |
| 3561 | goto out; |
| 3562 | } |
| 3563 | |
| 3564 | BUG_ON(cow_len == 0); |
| 3565 | |
| 3566 | context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS); |
| 3567 | if (!context) { |
| 3568 | ret = -ENOMEM; |
| 3569 | mlog_errno(ret); |
| 3570 | goto out; |
| 3571 | } |
| 3572 | |
| 3573 | context->inode = inode; |
| 3574 | context->cow_start = cow_start; |
| 3575 | context->cow_len = cow_len; |
| 3576 | context->ref_tree = ref_tree; |
| 3577 | context->ref_root_bh = ref_root_bh;; |
| 3578 | context->cow_object = xv; |
| 3579 | |
| 3580 | context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd; |
| 3581 | /* We need the extra credits for duplicate_clusters by jbd. */ |
| 3582 | context->extra_credits = |
| 3583 | ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len; |
| 3584 | context->get_clusters = ocfs2_xattr_value_get_clusters; |
| 3585 | context->post_refcount = post; |
| 3586 | |
| 3587 | ocfs2_init_xattr_value_extent_tree(&context->data_et, |
| 3588 | INODE_CACHE(inode), vb); |
| 3589 | |
| 3590 | ret = ocfs2_replace_cow(context); |
| 3591 | if (ret) |
| 3592 | mlog_errno(ret); |
| 3593 | |
| 3594 | out: |
| 3595 | kfree(context); |
| 3596 | return ret; |
| 3597 | } |
| 3598 | |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3599 | /* |
| 3600 | * Insert a new extent into refcount tree and mark a extent rec |
| 3601 | * as refcounted in the dinode tree. |
| 3602 | */ |
| 3603 | int ocfs2_add_refcount_flag(struct inode *inode, |
| 3604 | struct ocfs2_extent_tree *data_et, |
| 3605 | struct ocfs2_caching_info *ref_ci, |
| 3606 | struct buffer_head *ref_root_bh, |
| 3607 | u32 cpos, u32 p_cluster, u32 num_clusters, |
Tao Ma | 0129241 | 2009-09-21 13:04:19 +0800 | [diff] [blame] | 3608 | struct ocfs2_cached_dealloc_ctxt *dealloc, |
| 3609 | struct ocfs2_post_refcount *post) |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3610 | { |
| 3611 | int ret; |
| 3612 | handle_t *handle; |
| 3613 | int credits = 1, ref_blocks = 0; |
| 3614 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 3615 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 3616 | |
| 3617 | ret = ocfs2_calc_refcount_meta_credits(inode->i_sb, |
| 3618 | ref_ci, ref_root_bh, |
| 3619 | p_cluster, num_clusters, |
| 3620 | &ref_blocks, &credits); |
| 3621 | if (ret) { |
| 3622 | mlog_errno(ret); |
| 3623 | goto out; |
| 3624 | } |
| 3625 | |
| 3626 | mlog(0, "reserve new metadata %d, credits = %d\n", |
| 3627 | ref_blocks, credits); |
| 3628 | |
| 3629 | if (ref_blocks) { |
| 3630 | ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb), |
| 3631 | ref_blocks, &meta_ac); |
| 3632 | if (ret) { |
| 3633 | mlog_errno(ret); |
| 3634 | goto out; |
| 3635 | } |
| 3636 | } |
| 3637 | |
Tao Ma | 0129241 | 2009-09-21 13:04:19 +0800 | [diff] [blame] | 3638 | if (post) |
| 3639 | credits += post->credits; |
| 3640 | |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3641 | handle = ocfs2_start_trans(osb, credits); |
| 3642 | if (IS_ERR(handle)) { |
| 3643 | ret = PTR_ERR(handle); |
| 3644 | mlog_errno(ret); |
| 3645 | goto out; |
| 3646 | } |
| 3647 | |
| 3648 | ret = ocfs2_mark_extent_refcounted(inode, data_et, handle, |
| 3649 | cpos, num_clusters, p_cluster, |
| 3650 | meta_ac, dealloc); |
| 3651 | if (ret) { |
| 3652 | mlog_errno(ret); |
| 3653 | goto out_commit; |
| 3654 | } |
| 3655 | |
Tao Ma | 7540c1a | 2009-08-18 11:44:03 +0800 | [diff] [blame] | 3656 | ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh, |
| 3657 | p_cluster, num_clusters, 0, |
| 3658 | meta_ac, dealloc); |
Tao Ma | 0129241 | 2009-09-21 13:04:19 +0800 | [diff] [blame] | 3659 | if (ret) { |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3660 | mlog_errno(ret); |
Tao Ma | 0129241 | 2009-09-21 13:04:19 +0800 | [diff] [blame] | 3661 | goto out_commit; |
| 3662 | } |
| 3663 | |
| 3664 | if (post && post->func) { |
| 3665 | ret = post->func(inode, handle, post->para); |
| 3666 | if (ret) |
| 3667 | mlog_errno(ret); |
| 3668 | } |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3669 | |
| 3670 | out_commit: |
| 3671 | ocfs2_commit_trans(osb, handle); |
| 3672 | out: |
| 3673 | if (meta_ac) |
| 3674 | ocfs2_free_alloc_context(meta_ac); |
| 3675 | return ret; |
| 3676 | } |
| 3677 | |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 3678 | static int ocfs2_change_ctime(struct inode *inode, |
| 3679 | struct buffer_head *di_bh) |
| 3680 | { |
| 3681 | int ret; |
| 3682 | handle_t *handle; |
| 3683 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 3684 | |
| 3685 | handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), |
| 3686 | OCFS2_INODE_UPDATE_CREDITS); |
| 3687 | if (IS_ERR(handle)) { |
| 3688 | ret = PTR_ERR(handle); |
| 3689 | mlog_errno(ret); |
| 3690 | goto out; |
| 3691 | } |
| 3692 | |
| 3693 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, |
| 3694 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 3695 | if (ret) { |
| 3696 | mlog_errno(ret); |
| 3697 | goto out_commit; |
| 3698 | } |
| 3699 | |
| 3700 | inode->i_ctime = CURRENT_TIME; |
| 3701 | di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); |
| 3702 | di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
| 3703 | |
| 3704 | ocfs2_journal_dirty(handle, di_bh); |
| 3705 | |
| 3706 | out_commit: |
| 3707 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); |
| 3708 | out: |
| 3709 | return ret; |
| 3710 | } |
| 3711 | |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3712 | static int ocfs2_attach_refcount_tree(struct inode *inode, |
| 3713 | struct buffer_head *di_bh) |
| 3714 | { |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 3715 | int ret, data_changed = 0; |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3716 | struct buffer_head *ref_root_bh = NULL; |
| 3717 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 3718 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 3719 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 3720 | struct ocfs2_refcount_tree *ref_tree; |
| 3721 | unsigned int ext_flags; |
| 3722 | loff_t size; |
| 3723 | u32 cpos, num_clusters, clusters, p_cluster; |
| 3724 | struct ocfs2_cached_dealloc_ctxt dealloc; |
| 3725 | struct ocfs2_extent_tree di_et; |
| 3726 | |
| 3727 | ocfs2_init_dealloc_ctxt(&dealloc); |
| 3728 | |
| 3729 | if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) { |
| 3730 | ret = ocfs2_create_refcount_tree(inode, di_bh); |
| 3731 | if (ret) { |
| 3732 | mlog_errno(ret); |
| 3733 | goto out; |
| 3734 | } |
| 3735 | } |
| 3736 | |
| 3737 | BUG_ON(!di->i_refcount_loc); |
| 3738 | ret = ocfs2_lock_refcount_tree(osb, |
| 3739 | le64_to_cpu(di->i_refcount_loc), 1, |
| 3740 | &ref_tree, &ref_root_bh); |
| 3741 | if (ret) { |
| 3742 | mlog_errno(ret); |
| 3743 | goto out; |
| 3744 | } |
| 3745 | |
| 3746 | ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh); |
| 3747 | |
| 3748 | size = i_size_read(inode); |
| 3749 | clusters = ocfs2_clusters_for_bytes(inode->i_sb, size); |
| 3750 | |
| 3751 | cpos = 0; |
| 3752 | while (cpos < clusters) { |
| 3753 | ret = ocfs2_get_clusters(inode, cpos, &p_cluster, |
| 3754 | &num_clusters, &ext_flags); |
| 3755 | |
| 3756 | if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) { |
| 3757 | ret = ocfs2_add_refcount_flag(inode, &di_et, |
| 3758 | &ref_tree->rf_ci, |
| 3759 | ref_root_bh, cpos, |
| 3760 | p_cluster, num_clusters, |
Tao Ma | 0129241 | 2009-09-21 13:04:19 +0800 | [diff] [blame] | 3761 | &dealloc, NULL); |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3762 | if (ret) { |
| 3763 | mlog_errno(ret); |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 3764 | goto unlock; |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3765 | } |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 3766 | |
| 3767 | data_changed = 1; |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3768 | } |
| 3769 | cpos += num_clusters; |
| 3770 | } |
| 3771 | |
Tao Ma | 0129241 | 2009-09-21 13:04:19 +0800 | [diff] [blame] | 3772 | if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) { |
| 3773 | ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh, |
| 3774 | &ref_tree->rf_ci, |
| 3775 | ref_root_bh, |
| 3776 | &dealloc); |
| 3777 | if (ret) { |
| 3778 | mlog_errno(ret); |
| 3779 | goto unlock; |
| 3780 | } |
| 3781 | } |
| 3782 | |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 3783 | if (data_changed) { |
| 3784 | ret = ocfs2_change_ctime(inode, di_bh); |
| 3785 | if (ret) |
| 3786 | mlog_errno(ret); |
| 3787 | } |
| 3788 | |
| 3789 | unlock: |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3790 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); |
| 3791 | brelse(ref_root_bh); |
| 3792 | |
| 3793 | if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) { |
| 3794 | ocfs2_schedule_truncate_log_flush(osb, 1); |
| 3795 | ocfs2_run_deallocs(osb, &dealloc); |
| 3796 | } |
| 3797 | out: |
| 3798 | /* |
| 3799 | * Empty the extent map so that we may get the right extent |
| 3800 | * record from the disk. |
| 3801 | */ |
| 3802 | ocfs2_extent_map_trunc(inode, 0); |
| 3803 | |
| 3804 | return ret; |
| 3805 | } |
| 3806 | |
| 3807 | static int ocfs2_add_refcounted_extent(struct inode *inode, |
| 3808 | struct ocfs2_extent_tree *et, |
| 3809 | struct ocfs2_caching_info *ref_ci, |
| 3810 | struct buffer_head *ref_root_bh, |
| 3811 | u32 cpos, u32 p_cluster, u32 num_clusters, |
| 3812 | unsigned int ext_flags, |
| 3813 | struct ocfs2_cached_dealloc_ctxt *dealloc) |
| 3814 | { |
| 3815 | int ret; |
| 3816 | handle_t *handle; |
| 3817 | int credits = 0; |
| 3818 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 3819 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 3820 | |
| 3821 | ret = ocfs2_lock_refcount_allocators(inode->i_sb, |
| 3822 | p_cluster, num_clusters, |
| 3823 | et, ref_ci, |
| 3824 | ref_root_bh, &meta_ac, |
| 3825 | NULL, &credits); |
| 3826 | if (ret) { |
| 3827 | mlog_errno(ret); |
| 3828 | goto out; |
| 3829 | } |
| 3830 | |
| 3831 | handle = ocfs2_start_trans(osb, credits); |
| 3832 | if (IS_ERR(handle)) { |
| 3833 | ret = PTR_ERR(handle); |
| 3834 | mlog_errno(ret); |
| 3835 | goto out; |
| 3836 | } |
| 3837 | |
| 3838 | ret = ocfs2_insert_extent(handle, et, cpos, |
| 3839 | cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb, |
| 3840 | p_cluster)), |
| 3841 | num_clusters, ext_flags, meta_ac); |
| 3842 | if (ret) { |
| 3843 | mlog_errno(ret); |
| 3844 | goto out_commit; |
| 3845 | } |
| 3846 | |
Tao Ma | 2999d12 | 2009-08-18 11:43:55 +0800 | [diff] [blame] | 3847 | ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh, |
| 3848 | p_cluster, num_clusters, |
| 3849 | meta_ac, dealloc); |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3850 | if (ret) |
| 3851 | mlog_errno(ret); |
| 3852 | |
| 3853 | out_commit: |
| 3854 | ocfs2_commit_trans(osb, handle); |
| 3855 | out: |
| 3856 | if (meta_ac) |
| 3857 | ocfs2_free_alloc_context(meta_ac); |
| 3858 | return ret; |
| 3859 | } |
| 3860 | |
| 3861 | static int ocfs2_duplicate_extent_list(struct inode *s_inode, |
| 3862 | struct inode *t_inode, |
| 3863 | struct buffer_head *t_bh, |
| 3864 | struct ocfs2_caching_info *ref_ci, |
| 3865 | struct buffer_head *ref_root_bh, |
| 3866 | struct ocfs2_cached_dealloc_ctxt *dealloc) |
| 3867 | { |
| 3868 | int ret = 0; |
| 3869 | u32 p_cluster, num_clusters, clusters, cpos; |
| 3870 | loff_t size; |
| 3871 | unsigned int ext_flags; |
| 3872 | struct ocfs2_extent_tree et; |
| 3873 | |
| 3874 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh); |
| 3875 | |
| 3876 | size = i_size_read(s_inode); |
| 3877 | clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size); |
| 3878 | |
| 3879 | cpos = 0; |
| 3880 | while (cpos < clusters) { |
| 3881 | ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster, |
| 3882 | &num_clusters, &ext_flags); |
| 3883 | |
| 3884 | if (p_cluster) { |
| 3885 | ret = ocfs2_add_refcounted_extent(t_inode, &et, |
| 3886 | ref_ci, ref_root_bh, |
| 3887 | cpos, p_cluster, |
| 3888 | num_clusters, |
| 3889 | ext_flags, |
| 3890 | dealloc); |
| 3891 | if (ret) { |
| 3892 | mlog_errno(ret); |
| 3893 | goto out; |
| 3894 | } |
| 3895 | } |
| 3896 | |
| 3897 | cpos += num_clusters; |
| 3898 | } |
| 3899 | |
| 3900 | out: |
| 3901 | return ret; |
| 3902 | } |
| 3903 | |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 3904 | /* |
| 3905 | * change the new file's attributes to the src. |
| 3906 | * |
| 3907 | * reflink creates a snapshot of a file, that means the attributes |
| 3908 | * must be identical except for three exceptions - nlink, ino, and ctime. |
| 3909 | */ |
| 3910 | static int ocfs2_complete_reflink(struct inode *s_inode, |
| 3911 | struct buffer_head *s_bh, |
| 3912 | struct inode *t_inode, |
Tao Ma | 0fe9b66 | 2009-08-18 11:47:56 +0800 | [diff] [blame] | 3913 | struct buffer_head *t_bh, |
| 3914 | bool preserve) |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 3915 | { |
| 3916 | int ret; |
| 3917 | handle_t *handle; |
| 3918 | struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data; |
| 3919 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data; |
| 3920 | loff_t size = i_size_read(s_inode); |
| 3921 | |
| 3922 | handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb), |
| 3923 | OCFS2_INODE_UPDATE_CREDITS); |
| 3924 | if (IS_ERR(handle)) { |
| 3925 | ret = PTR_ERR(handle); |
| 3926 | mlog_errno(ret); |
| 3927 | return ret; |
| 3928 | } |
| 3929 | |
| 3930 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh, |
| 3931 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 3932 | if (ret) { |
| 3933 | mlog_errno(ret); |
| 3934 | goto out_commit; |
| 3935 | } |
| 3936 | |
| 3937 | spin_lock(&OCFS2_I(t_inode)->ip_lock); |
| 3938 | OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters; |
| 3939 | OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr; |
| 3940 | OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features; |
| 3941 | spin_unlock(&OCFS2_I(t_inode)->ip_lock); |
| 3942 | i_size_write(t_inode, size); |
| 3943 | |
| 3944 | di->i_xattr_inline_size = s_di->i_xattr_inline_size; |
| 3945 | di->i_clusters = s_di->i_clusters; |
| 3946 | di->i_size = s_di->i_size; |
| 3947 | di->i_dyn_features = s_di->i_dyn_features; |
| 3948 | di->i_attr = s_di->i_attr; |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 3949 | |
Tao Ma | 0fe9b66 | 2009-08-18 11:47:56 +0800 | [diff] [blame] | 3950 | if (preserve) { |
| 3951 | di->i_uid = s_di->i_uid; |
| 3952 | di->i_gid = s_di->i_gid; |
| 3953 | di->i_mode = s_di->i_mode; |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 3954 | |
Tao Ma | 0fe9b66 | 2009-08-18 11:47:56 +0800 | [diff] [blame] | 3955 | /* |
| 3956 | * update time. |
| 3957 | * we want mtime to appear identical to the source and |
| 3958 | * update ctime. |
| 3959 | */ |
| 3960 | t_inode->i_ctime = CURRENT_TIME; |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 3961 | |
Tao Ma | 0fe9b66 | 2009-08-18 11:47:56 +0800 | [diff] [blame] | 3962 | di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec); |
| 3963 | di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec); |
| 3964 | |
| 3965 | t_inode->i_mtime = s_inode->i_mtime; |
| 3966 | di->i_mtime = s_di->i_mtime; |
| 3967 | di->i_mtime_nsec = s_di->i_mtime_nsec; |
| 3968 | } |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 3969 | |
| 3970 | ocfs2_journal_dirty(handle, t_bh); |
| 3971 | |
| 3972 | out_commit: |
| 3973 | ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle); |
| 3974 | return ret; |
| 3975 | } |
| 3976 | |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3977 | static int ocfs2_create_reflink_node(struct inode *s_inode, |
| 3978 | struct buffer_head *s_bh, |
| 3979 | struct inode *t_inode, |
Tao Ma | 0fe9b66 | 2009-08-18 11:47:56 +0800 | [diff] [blame] | 3980 | struct buffer_head *t_bh, |
| 3981 | bool preserve) |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 3982 | { |
| 3983 | int ret; |
| 3984 | struct buffer_head *ref_root_bh = NULL; |
| 3985 | struct ocfs2_cached_dealloc_ctxt dealloc; |
| 3986 | struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb); |
| 3987 | struct ocfs2_refcount_block *rb; |
| 3988 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data; |
| 3989 | struct ocfs2_refcount_tree *ref_tree; |
| 3990 | |
| 3991 | ocfs2_init_dealloc_ctxt(&dealloc); |
| 3992 | |
| 3993 | ret = ocfs2_set_refcount_tree(t_inode, t_bh, |
| 3994 | le64_to_cpu(di->i_refcount_loc)); |
| 3995 | if (ret) { |
| 3996 | mlog_errno(ret); |
| 3997 | goto out; |
| 3998 | } |
| 3999 | |
| 4000 | ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc), |
| 4001 | 1, &ref_tree, &ref_root_bh); |
| 4002 | if (ret) { |
| 4003 | mlog_errno(ret); |
| 4004 | goto out; |
| 4005 | } |
| 4006 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; |
| 4007 | |
| 4008 | ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh, |
| 4009 | &ref_tree->rf_ci, ref_root_bh, |
| 4010 | &dealloc); |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 4011 | if (ret) { |
| 4012 | mlog_errno(ret); |
| 4013 | goto out_unlock_refcount; |
| 4014 | } |
| 4015 | |
Tao Ma | a9063ab | 2009-08-18 11:40:59 +0800 | [diff] [blame] | 4016 | out_unlock_refcount: |
Tao Ma | 110a045 | 2009-08-22 23:54:27 +0800 | [diff] [blame] | 4017 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); |
| 4018 | brelse(ref_root_bh); |
| 4019 | out: |
| 4020 | if (ocfs2_dealloc_has_cluster(&dealloc)) { |
| 4021 | ocfs2_schedule_truncate_log_flush(osb, 1); |
| 4022 | ocfs2_run_deallocs(osb, &dealloc); |
| 4023 | } |
| 4024 | |
| 4025 | return ret; |
| 4026 | } |
Tao Ma | 09bf27a | 2009-09-21 10:38:17 +0800 | [diff] [blame] | 4027 | |
| 4028 | static int __ocfs2_reflink(struct dentry *old_dentry, |
| 4029 | struct buffer_head *old_bh, |
| 4030 | struct inode *new_inode, |
| 4031 | bool preserve) |
| 4032 | { |
| 4033 | int ret; |
| 4034 | struct inode *inode = old_dentry->d_inode; |
| 4035 | struct buffer_head *new_bh = NULL; |
| 4036 | |
| 4037 | ret = filemap_fdatawrite(inode->i_mapping); |
| 4038 | if (ret) { |
| 4039 | mlog_errno(ret); |
| 4040 | goto out; |
| 4041 | } |
| 4042 | |
| 4043 | ret = ocfs2_attach_refcount_tree(inode, old_bh); |
| 4044 | if (ret) { |
| 4045 | mlog_errno(ret); |
| 4046 | goto out; |
| 4047 | } |
| 4048 | |
| 4049 | mutex_lock(&new_inode->i_mutex); |
| 4050 | ret = ocfs2_inode_lock(new_inode, &new_bh, 1); |
| 4051 | if (ret) { |
| 4052 | mlog_errno(ret); |
| 4053 | goto out_unlock; |
| 4054 | } |
| 4055 | |
| 4056 | ret = ocfs2_create_reflink_node(inode, old_bh, |
| 4057 | new_inode, new_bh, preserve); |
| 4058 | if (ret) { |
| 4059 | mlog_errno(ret); |
| 4060 | goto inode_unlock; |
| 4061 | } |
| 4062 | |
| 4063 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) { |
| 4064 | ret = ocfs2_reflink_xattrs(inode, old_bh, |
| 4065 | new_inode, new_bh, |
| 4066 | preserve); |
Tao Ma | 87f4b1b | 2009-10-15 11:10:48 +0800 | [diff] [blame^] | 4067 | if (ret) { |
Tao Ma | 09bf27a | 2009-09-21 10:38:17 +0800 | [diff] [blame] | 4068 | mlog_errno(ret); |
Tao Ma | 87f4b1b | 2009-10-15 11:10:48 +0800 | [diff] [blame^] | 4069 | goto inode_unlock; |
| 4070 | } |
Tao Ma | 09bf27a | 2009-09-21 10:38:17 +0800 | [diff] [blame] | 4071 | } |
Tao Ma | 87f4b1b | 2009-10-15 11:10:48 +0800 | [diff] [blame^] | 4072 | |
| 4073 | ret = ocfs2_complete_reflink(inode, old_bh, |
| 4074 | new_inode, new_bh, preserve); |
| 4075 | if (ret) |
| 4076 | mlog_errno(ret); |
| 4077 | |
Tao Ma | 09bf27a | 2009-09-21 10:38:17 +0800 | [diff] [blame] | 4078 | inode_unlock: |
| 4079 | ocfs2_inode_unlock(new_inode, 1); |
| 4080 | brelse(new_bh); |
| 4081 | out_unlock: |
| 4082 | mutex_unlock(&new_inode->i_mutex); |
| 4083 | out: |
| 4084 | if (!ret) { |
| 4085 | ret = filemap_fdatawait(inode->i_mapping); |
| 4086 | if (ret) |
| 4087 | mlog_errno(ret); |
| 4088 | } |
| 4089 | return ret; |
| 4090 | } |
| 4091 | |
| 4092 | static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir, |
| 4093 | struct dentry *new_dentry, bool preserve) |
| 4094 | { |
| 4095 | int error; |
| 4096 | struct inode *inode = old_dentry->d_inode; |
| 4097 | struct buffer_head *old_bh = NULL; |
| 4098 | struct inode *new_orphan_inode = NULL; |
| 4099 | |
| 4100 | if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) |
| 4101 | return -EOPNOTSUPP; |
| 4102 | |
| 4103 | error = ocfs2_create_inode_in_orphan(dir, inode->i_mode, |
| 4104 | &new_orphan_inode); |
| 4105 | if (error) { |
| 4106 | mlog_errno(error); |
| 4107 | goto out; |
| 4108 | } |
| 4109 | |
| 4110 | error = ocfs2_inode_lock(inode, &old_bh, 1); |
| 4111 | if (error) { |
| 4112 | mlog_errno(error); |
| 4113 | goto out; |
| 4114 | } |
| 4115 | |
| 4116 | down_write(&OCFS2_I(inode)->ip_xattr_sem); |
| 4117 | down_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 4118 | error = __ocfs2_reflink(old_dentry, old_bh, |
| 4119 | new_orphan_inode, preserve); |
| 4120 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 4121 | up_write(&OCFS2_I(inode)->ip_xattr_sem); |
| 4122 | |
| 4123 | ocfs2_inode_unlock(inode, 1); |
| 4124 | brelse(old_bh); |
| 4125 | |
| 4126 | if (error) { |
| 4127 | mlog_errno(error); |
| 4128 | goto out; |
| 4129 | } |
| 4130 | |
| 4131 | /* If the security isn't preserved, we need to re-initialize them. */ |
| 4132 | if (!preserve) { |
| 4133 | error = ocfs2_init_security_and_acl(dir, new_orphan_inode); |
| 4134 | if (error) |
| 4135 | mlog_errno(error); |
| 4136 | } |
| 4137 | out: |
| 4138 | if (!error) { |
| 4139 | error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode, |
| 4140 | new_dentry); |
| 4141 | if (error) |
| 4142 | mlog_errno(error); |
| 4143 | } |
| 4144 | |
| 4145 | if (new_orphan_inode) { |
| 4146 | /* |
| 4147 | * We need to open_unlock the inode no matter whether we |
| 4148 | * succeed or not, so that other nodes can delete it later. |
| 4149 | */ |
| 4150 | ocfs2_open_unlock(new_orphan_inode); |
| 4151 | if (error) |
| 4152 | iput(new_orphan_inode); |
| 4153 | } |
| 4154 | |
| 4155 | return error; |
| 4156 | } |
Tao Ma | bd50873 | 2009-09-21 11:25:14 +0800 | [diff] [blame] | 4157 | |
| 4158 | /* |
| 4159 | * Below here are the bits used by OCFS2_IOC_REFLINK() to fake |
| 4160 | * sys_reflink(). This will go away when vfs_reflink() exists in |
| 4161 | * fs/namei.c. |
| 4162 | */ |
| 4163 | |
| 4164 | /* copied from may_create in VFS. */ |
| 4165 | static inline int ocfs2_may_create(struct inode *dir, struct dentry *child) |
| 4166 | { |
| 4167 | if (child->d_inode) |
| 4168 | return -EEXIST; |
| 4169 | if (IS_DEADDIR(dir)) |
| 4170 | return -ENOENT; |
| 4171 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); |
| 4172 | } |
| 4173 | |
| 4174 | /* copied from user_path_parent. */ |
| 4175 | static int ocfs2_user_path_parent(const char __user *path, |
| 4176 | struct nameidata *nd, char **name) |
| 4177 | { |
| 4178 | char *s = getname(path); |
| 4179 | int error; |
| 4180 | |
| 4181 | if (IS_ERR(s)) |
| 4182 | return PTR_ERR(s); |
| 4183 | |
| 4184 | error = path_lookup(s, LOOKUP_PARENT, nd); |
| 4185 | if (error) |
| 4186 | putname(s); |
| 4187 | else |
| 4188 | *name = s; |
| 4189 | |
| 4190 | return error; |
| 4191 | } |
| 4192 | |
| 4193 | /** |
| 4194 | * ocfs2_vfs_reflink - Create a reference-counted link |
| 4195 | * |
| 4196 | * @old_dentry: source dentry + inode |
| 4197 | * @dir: directory to create the target |
| 4198 | * @new_dentry: target dentry |
| 4199 | * @preserve: if true, preserve all file attributes |
| 4200 | */ |
| 4201 | int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir, |
| 4202 | struct dentry *new_dentry, bool preserve) |
| 4203 | { |
| 4204 | struct inode *inode = old_dentry->d_inode; |
| 4205 | int error; |
| 4206 | |
| 4207 | if (!inode) |
| 4208 | return -ENOENT; |
| 4209 | |
| 4210 | error = ocfs2_may_create(dir, new_dentry); |
| 4211 | if (error) |
| 4212 | return error; |
| 4213 | |
| 4214 | if (dir->i_sb != inode->i_sb) |
| 4215 | return -EXDEV; |
| 4216 | |
| 4217 | /* |
| 4218 | * A reflink to an append-only or immutable file cannot be created. |
| 4219 | */ |
| 4220 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) |
| 4221 | return -EPERM; |
| 4222 | |
| 4223 | /* Only regular files can be reflinked. */ |
| 4224 | if (!S_ISREG(inode->i_mode)) |
| 4225 | return -EPERM; |
| 4226 | |
| 4227 | /* |
| 4228 | * If the caller wants to preserve ownership, they require the |
| 4229 | * rights to do so. |
| 4230 | */ |
| 4231 | if (preserve) { |
| 4232 | if ((current_fsuid() != inode->i_uid) && !capable(CAP_CHOWN)) |
| 4233 | return -EPERM; |
| 4234 | if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN)) |
| 4235 | return -EPERM; |
| 4236 | } |
| 4237 | |
| 4238 | /* |
| 4239 | * If the caller is modifying any aspect of the attributes, they |
| 4240 | * are not creating a snapshot. They need read permission on the |
| 4241 | * file. |
| 4242 | */ |
| 4243 | if (!preserve) { |
| 4244 | error = inode_permission(inode, MAY_READ); |
| 4245 | if (error) |
| 4246 | return error; |
| 4247 | } |
| 4248 | |
| 4249 | mutex_lock(&inode->i_mutex); |
| 4250 | vfs_dq_init(dir); |
| 4251 | error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve); |
| 4252 | mutex_unlock(&inode->i_mutex); |
| 4253 | if (!error) |
| 4254 | fsnotify_create(dir, new_dentry); |
| 4255 | return error; |
| 4256 | } |
| 4257 | /* |
| 4258 | * Most codes are copied from sys_linkat. |
| 4259 | */ |
| 4260 | int ocfs2_reflink_ioctl(struct inode *inode, |
| 4261 | const char __user *oldname, |
| 4262 | const char __user *newname, |
| 4263 | bool preserve) |
| 4264 | { |
| 4265 | struct dentry *new_dentry; |
| 4266 | struct nameidata nd; |
| 4267 | struct path old_path; |
| 4268 | int error; |
| 4269 | char *to = NULL; |
| 4270 | |
| 4271 | if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) |
| 4272 | return -EOPNOTSUPP; |
| 4273 | |
| 4274 | error = user_path_at(AT_FDCWD, oldname, 0, &old_path); |
| 4275 | if (error) { |
| 4276 | mlog_errno(error); |
| 4277 | return error; |
| 4278 | } |
| 4279 | |
| 4280 | error = ocfs2_user_path_parent(newname, &nd, &to); |
| 4281 | if (error) { |
| 4282 | mlog_errno(error); |
| 4283 | goto out; |
| 4284 | } |
| 4285 | |
| 4286 | error = -EXDEV; |
| 4287 | if (old_path.mnt != nd.path.mnt) |
| 4288 | goto out_release; |
| 4289 | new_dentry = lookup_create(&nd, 0); |
| 4290 | error = PTR_ERR(new_dentry); |
| 4291 | if (IS_ERR(new_dentry)) { |
| 4292 | mlog_errno(error); |
| 4293 | goto out_unlock; |
| 4294 | } |
| 4295 | |
| 4296 | error = mnt_want_write(nd.path.mnt); |
| 4297 | if (error) { |
| 4298 | mlog_errno(error); |
| 4299 | goto out_dput; |
| 4300 | } |
| 4301 | |
| 4302 | error = ocfs2_vfs_reflink(old_path.dentry, |
| 4303 | nd.path.dentry->d_inode, |
| 4304 | new_dentry, preserve); |
| 4305 | mnt_drop_write(nd.path.mnt); |
| 4306 | out_dput: |
| 4307 | dput(new_dentry); |
| 4308 | out_unlock: |
| 4309 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
| 4310 | out_release: |
| 4311 | path_put(&nd.path); |
| 4312 | putname(to); |
| 4313 | out: |
| 4314 | path_put(&old_path); |
| 4315 | |
| 4316 | return error; |
| 4317 | } |