Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/hfsplus/brec.c |
| 3 | * |
| 4 | * Copyright (C) 2001 |
| 5 | * Brad Boyer (flar@allandria.com) |
| 6 | * (C) 2003 Ardis Technologies <roman@ardistech.com> |
| 7 | * |
| 8 | * Handle individual btree records |
| 9 | */ |
| 10 | |
| 11 | #include "hfsplus_fs.h" |
| 12 | #include "hfsplus_raw.h" |
| 13 | |
| 14 | static struct hfs_bnode *hfs_bnode_split(struct hfs_find_data *fd); |
| 15 | static int hfs_brec_update_parent(struct hfs_find_data *fd); |
| 16 | static int hfs_btree_inc_height(struct hfs_btree *); |
| 17 | |
| 18 | /* Get the length and offset of the given record in the given node */ |
| 19 | u16 hfs_brec_lenoff(struct hfs_bnode *node, u16 rec, u16 *off) |
| 20 | { |
| 21 | __be16 retval[2]; |
| 22 | u16 dataoff; |
| 23 | |
| 24 | dataoff = node->tree->node_size - (rec + 2) * 2; |
| 25 | hfs_bnode_read(node, retval, dataoff, 4); |
| 26 | *off = be16_to_cpu(retval[1]); |
| 27 | return be16_to_cpu(retval[0]) - *off; |
| 28 | } |
| 29 | |
| 30 | /* Get the length of the key from a keyed record */ |
| 31 | u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec) |
| 32 | { |
| 33 | u16 retval, recoff; |
| 34 | |
| 35 | if (node->type != HFS_NODE_INDEX && node->type != HFS_NODE_LEAF) |
| 36 | return 0; |
| 37 | |
| 38 | if ((node->type == HFS_NODE_INDEX) && |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 39 | !(node->tree->attributes & HFS_TREE_VARIDXKEYS) && |
| 40 | (node->tree->cnid != HFSPLUS_ATTR_CNID)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | retval = node->tree->max_key_len + 2; |
| 42 | } else { |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 43 | recoff = hfs_bnode_read_u16(node, |
| 44 | node->tree->node_size - (rec + 1) * 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | if (!recoff) |
| 46 | return 0; |
Naohiro Aota | aac4e419 | 2011-07-12 02:54:13 +0900 | [diff] [blame] | 47 | if (recoff > node->tree->node_size - 2) { |
Joe Perches | d6142673 | 2013-04-30 15:27:55 -0700 | [diff] [blame] | 48 | pr_err("recoff %d too large\n", recoff); |
Naohiro Aota | aac4e419 | 2011-07-12 02:54:13 +0900 | [diff] [blame] | 49 | return 0; |
| 50 | } |
Christoph Hellwig | 13571a6 | 2010-10-14 09:54:23 -0400 | [diff] [blame] | 51 | |
| 52 | retval = hfs_bnode_read_u16(node, recoff) + 2; |
| 53 | if (retval > node->tree->max_key_len + 2) { |
Joe Perches | d6142673 | 2013-04-30 15:27:55 -0700 | [diff] [blame] | 54 | pr_err("keylen %d too large\n", |
Christoph Hellwig | 13571a6 | 2010-10-14 09:54:23 -0400 | [diff] [blame] | 55 | retval); |
| 56 | retval = 0; |
Eric Sandeen | 9250f92 | 2010-10-14 09:53:48 -0400 | [diff] [blame] | 57 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | } |
| 59 | return retval; |
| 60 | } |
| 61 | |
| 62 | int hfs_brec_insert(struct hfs_find_data *fd, void *entry, int entry_len) |
| 63 | { |
| 64 | struct hfs_btree *tree; |
| 65 | struct hfs_bnode *node, *new_node; |
| 66 | int size, key_len, rec; |
| 67 | int data_off, end_off; |
| 68 | int idx_rec_off, data_rec_off, end_rec_off; |
| 69 | __be32 cnid; |
| 70 | |
| 71 | tree = fd->tree; |
| 72 | if (!fd->bnode) { |
| 73 | if (!tree->root) |
| 74 | hfs_btree_inc_height(tree); |
| 75 | fd->bnode = hfs_bnode_find(tree, tree->leaf_head); |
| 76 | if (IS_ERR(fd->bnode)) |
| 77 | return PTR_ERR(fd->bnode); |
| 78 | fd->record = -1; |
| 79 | } |
| 80 | new_node = NULL; |
| 81 | key_len = be16_to_cpu(fd->search_key->key_len) + 2; |
| 82 | again: |
| 83 | /* new record idx and complete record size */ |
| 84 | rec = fd->record + 1; |
| 85 | size = key_len + entry_len; |
| 86 | |
| 87 | node = fd->bnode; |
| 88 | hfs_bnode_dump(node); |
| 89 | /* get last offset */ |
| 90 | end_rec_off = tree->node_size - (node->num_recs + 1) * 2; |
| 91 | end_off = hfs_bnode_read_u16(node, end_rec_off); |
| 92 | end_rec_off -= 2; |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 93 | hfs_dbg(BNODE_MOD, "insert_rec: %d, %d, %d, %d\n", |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 94 | rec, size, end_off, end_rec_off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | if (size > end_rec_off - end_off) { |
| 96 | if (new_node) |
| 97 | panic("not enough room!\n"); |
| 98 | new_node = hfs_bnode_split(fd); |
| 99 | if (IS_ERR(new_node)) |
| 100 | return PTR_ERR(new_node); |
| 101 | goto again; |
| 102 | } |
| 103 | if (node->type == HFS_NODE_LEAF) { |
| 104 | tree->leaf_count++; |
| 105 | mark_inode_dirty(tree->inode); |
| 106 | } |
| 107 | node->num_recs++; |
| 108 | /* write new last offset */ |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 109 | hfs_bnode_write_u16(node, |
| 110 | offsetof(struct hfs_bnode_desc, num_recs), |
| 111 | node->num_recs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | hfs_bnode_write_u16(node, end_rec_off, end_off + size); |
| 113 | data_off = end_off; |
| 114 | data_rec_off = end_rec_off + 2; |
| 115 | idx_rec_off = tree->node_size - (rec + 1) * 2; |
| 116 | if (idx_rec_off == data_rec_off) |
| 117 | goto skip; |
| 118 | /* move all following entries */ |
| 119 | do { |
| 120 | data_off = hfs_bnode_read_u16(node, data_rec_off + 2); |
| 121 | hfs_bnode_write_u16(node, data_rec_off, data_off + size); |
| 122 | data_rec_off += 2; |
| 123 | } while (data_rec_off < idx_rec_off); |
| 124 | |
| 125 | /* move data away */ |
| 126 | hfs_bnode_move(node, data_off + size, data_off, |
| 127 | end_off - data_off); |
| 128 | |
| 129 | skip: |
| 130 | hfs_bnode_write(node, fd->search_key, data_off, key_len); |
| 131 | hfs_bnode_write(node, entry, data_off + key_len, entry_len); |
| 132 | hfs_bnode_dump(node); |
| 133 | |
| 134 | if (new_node) { |
| 135 | /* update parent key if we inserted a key |
| 136 | * at the start of the first node |
| 137 | */ |
| 138 | if (!rec && new_node != node) |
| 139 | hfs_brec_update_parent(fd); |
| 140 | |
| 141 | hfs_bnode_put(fd->bnode); |
| 142 | if (!new_node->parent) { |
| 143 | hfs_btree_inc_height(tree); |
| 144 | new_node->parent = tree->root; |
| 145 | } |
| 146 | fd->bnode = hfs_bnode_find(tree, new_node->parent); |
| 147 | |
| 148 | /* create index data entry */ |
| 149 | cnid = cpu_to_be32(new_node->this); |
| 150 | entry = &cnid; |
| 151 | entry_len = sizeof(cnid); |
| 152 | |
| 153 | /* get index key */ |
| 154 | hfs_bnode_read_key(new_node, fd->search_key, 14); |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 155 | __hfs_brec_find(fd->bnode, fd, hfs_find_rec_by_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
| 157 | hfs_bnode_put(new_node); |
| 158 | new_node = NULL; |
| 159 | |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 160 | if ((tree->attributes & HFS_TREE_VARIDXKEYS) || |
| 161 | (tree->cnid == HFSPLUS_ATTR_CNID)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | key_len = be16_to_cpu(fd->search_key->key_len) + 2; |
| 163 | else { |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 164 | fd->search_key->key_len = |
| 165 | cpu_to_be16(tree->max_key_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | key_len = tree->max_key_len + 2; |
| 167 | } |
| 168 | goto again; |
| 169 | } |
| 170 | |
| 171 | if (!rec) |
| 172 | hfs_brec_update_parent(fd); |
| 173 | |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | int hfs_brec_remove(struct hfs_find_data *fd) |
| 178 | { |
| 179 | struct hfs_btree *tree; |
| 180 | struct hfs_bnode *node, *parent; |
| 181 | int end_off, rec_off, data_off, size; |
| 182 | |
| 183 | tree = fd->tree; |
| 184 | node = fd->bnode; |
| 185 | again: |
| 186 | rec_off = tree->node_size - (fd->record + 2) * 2; |
| 187 | end_off = tree->node_size - (node->num_recs + 1) * 2; |
| 188 | |
| 189 | if (node->type == HFS_NODE_LEAF) { |
| 190 | tree->leaf_count--; |
| 191 | mark_inode_dirty(tree->inode); |
| 192 | } |
| 193 | hfs_bnode_dump(node); |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 194 | hfs_dbg(BNODE_MOD, "remove_rec: %d, %d\n", |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 195 | fd->record, fd->keylength + fd->entrylength); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | if (!--node->num_recs) { |
| 197 | hfs_bnode_unlink(node); |
| 198 | if (!node->parent) |
| 199 | return 0; |
| 200 | parent = hfs_bnode_find(tree, node->parent); |
| 201 | if (IS_ERR(parent)) |
| 202 | return PTR_ERR(parent); |
| 203 | hfs_bnode_put(node); |
| 204 | node = fd->bnode = parent; |
| 205 | |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 206 | __hfs_brec_find(node, fd, hfs_find_rec_by_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | goto again; |
| 208 | } |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 209 | hfs_bnode_write_u16(node, |
| 210 | offsetof(struct hfs_bnode_desc, num_recs), |
| 211 | node->num_recs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | if (rec_off == end_off) |
| 214 | goto skip; |
| 215 | size = fd->keylength + fd->entrylength; |
| 216 | |
| 217 | do { |
| 218 | data_off = hfs_bnode_read_u16(node, rec_off); |
| 219 | hfs_bnode_write_u16(node, rec_off + 2, data_off - size); |
| 220 | rec_off -= 2; |
| 221 | } while (rec_off >= end_off); |
| 222 | |
| 223 | /* fill hole */ |
| 224 | hfs_bnode_move(node, fd->keyoffset, fd->keyoffset + size, |
| 225 | data_off - fd->keyoffset - size); |
| 226 | skip: |
| 227 | hfs_bnode_dump(node); |
| 228 | if (!fd->record) |
| 229 | hfs_brec_update_parent(fd); |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | static struct hfs_bnode *hfs_bnode_split(struct hfs_find_data *fd) |
| 234 | { |
| 235 | struct hfs_btree *tree; |
Al Viro | b6b4142 | 2010-10-14 09:53:42 -0400 | [diff] [blame] | 236 | struct hfs_bnode *node, *new_node, *next_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | struct hfs_bnode_desc node_desc; |
| 238 | int num_recs, new_rec_off, new_off, old_rec_off; |
| 239 | int data_start, data_end, size; |
| 240 | |
| 241 | tree = fd->tree; |
| 242 | node = fd->bnode; |
| 243 | new_node = hfs_bmap_alloc(tree); |
| 244 | if (IS_ERR(new_node)) |
| 245 | return new_node; |
| 246 | hfs_bnode_get(node); |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 247 | hfs_dbg(BNODE_MOD, "split_nodes: %d - %d - %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | node->this, new_node->this, node->next); |
| 249 | new_node->next = node->next; |
| 250 | new_node->prev = node->this; |
| 251 | new_node->parent = node->parent; |
| 252 | new_node->type = node->type; |
| 253 | new_node->height = node->height; |
| 254 | |
Al Viro | b6b4142 | 2010-10-14 09:53:42 -0400 | [diff] [blame] | 255 | if (node->next) |
| 256 | next_node = hfs_bnode_find(tree, node->next); |
| 257 | else |
| 258 | next_node = NULL; |
| 259 | |
| 260 | if (IS_ERR(next_node)) { |
| 261 | hfs_bnode_put(node); |
| 262 | hfs_bnode_put(new_node); |
| 263 | return next_node; |
| 264 | } |
| 265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | size = tree->node_size / 2 - node->num_recs * 2 - 14; |
| 267 | old_rec_off = tree->node_size - 4; |
| 268 | num_recs = 1; |
| 269 | for (;;) { |
| 270 | data_start = hfs_bnode_read_u16(node, old_rec_off); |
| 271 | if (data_start > size) |
| 272 | break; |
| 273 | old_rec_off -= 2; |
| 274 | if (++num_recs < node->num_recs) |
| 275 | continue; |
| 276 | /* panic? */ |
| 277 | hfs_bnode_put(node); |
| 278 | hfs_bnode_put(new_node); |
Al Viro | b6b4142 | 2010-10-14 09:53:42 -0400 | [diff] [blame] | 279 | if (next_node) |
| 280 | hfs_bnode_put(next_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | return ERR_PTR(-ENOSPC); |
| 282 | } |
| 283 | |
| 284 | if (fd->record + 1 < num_recs) { |
| 285 | /* new record is in the lower half, |
| 286 | * so leave some more space there |
| 287 | */ |
| 288 | old_rec_off += 2; |
| 289 | num_recs--; |
| 290 | data_start = hfs_bnode_read_u16(node, old_rec_off); |
| 291 | } else { |
| 292 | hfs_bnode_put(node); |
| 293 | hfs_bnode_get(new_node); |
| 294 | fd->bnode = new_node; |
| 295 | fd->record -= num_recs; |
| 296 | fd->keyoffset -= data_start - 14; |
| 297 | fd->entryoffset -= data_start - 14; |
| 298 | } |
| 299 | new_node->num_recs = node->num_recs - num_recs; |
| 300 | node->num_recs = num_recs; |
| 301 | |
| 302 | new_rec_off = tree->node_size - 2; |
| 303 | new_off = 14; |
| 304 | size = data_start - new_off; |
| 305 | num_recs = new_node->num_recs; |
| 306 | data_end = data_start; |
| 307 | while (num_recs) { |
| 308 | hfs_bnode_write_u16(new_node, new_rec_off, new_off); |
| 309 | old_rec_off -= 2; |
| 310 | new_rec_off -= 2; |
| 311 | data_end = hfs_bnode_read_u16(node, old_rec_off); |
| 312 | new_off = data_end - size; |
| 313 | num_recs--; |
| 314 | } |
| 315 | hfs_bnode_write_u16(new_node, new_rec_off, new_off); |
| 316 | hfs_bnode_copy(new_node, 14, node, data_start, data_end - data_start); |
| 317 | |
| 318 | /* update new bnode header */ |
| 319 | node_desc.next = cpu_to_be32(new_node->next); |
| 320 | node_desc.prev = cpu_to_be32(new_node->prev); |
| 321 | node_desc.type = new_node->type; |
| 322 | node_desc.height = new_node->height; |
| 323 | node_desc.num_recs = cpu_to_be16(new_node->num_recs); |
| 324 | node_desc.reserved = 0; |
| 325 | hfs_bnode_write(new_node, &node_desc, 0, sizeof(node_desc)); |
| 326 | |
| 327 | /* update previous bnode header */ |
| 328 | node->next = new_node->this; |
| 329 | hfs_bnode_read(node, &node_desc, 0, sizeof(node_desc)); |
| 330 | node_desc.next = cpu_to_be32(node->next); |
| 331 | node_desc.num_recs = cpu_to_be16(node->num_recs); |
| 332 | hfs_bnode_write(node, &node_desc, 0, sizeof(node_desc)); |
| 333 | |
| 334 | /* update next bnode header */ |
Al Viro | b6b4142 | 2010-10-14 09:53:42 -0400 | [diff] [blame] | 335 | if (next_node) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | next_node->prev = new_node->this; |
| 337 | hfs_bnode_read(next_node, &node_desc, 0, sizeof(node_desc)); |
| 338 | node_desc.prev = cpu_to_be32(next_node->prev); |
| 339 | hfs_bnode_write(next_node, &node_desc, 0, sizeof(node_desc)); |
| 340 | hfs_bnode_put(next_node); |
| 341 | } else if (node->this == tree->leaf_tail) { |
| 342 | /* if there is no next node, this might be the new tail */ |
| 343 | tree->leaf_tail = new_node->this; |
| 344 | mark_inode_dirty(tree->inode); |
| 345 | } |
| 346 | |
| 347 | hfs_bnode_dump(node); |
| 348 | hfs_bnode_dump(new_node); |
| 349 | hfs_bnode_put(node); |
| 350 | |
| 351 | return new_node; |
| 352 | } |
| 353 | |
| 354 | static int hfs_brec_update_parent(struct hfs_find_data *fd) |
| 355 | { |
| 356 | struct hfs_btree *tree; |
| 357 | struct hfs_bnode *node, *new_node, *parent; |
| 358 | int newkeylen, diff; |
| 359 | int rec, rec_off, end_rec_off; |
| 360 | int start_off, end_off; |
| 361 | |
| 362 | tree = fd->tree; |
| 363 | node = fd->bnode; |
| 364 | new_node = NULL; |
| 365 | if (!node->parent) |
| 366 | return 0; |
| 367 | |
| 368 | again: |
| 369 | parent = hfs_bnode_find(tree, node->parent); |
| 370 | if (IS_ERR(parent)) |
| 371 | return PTR_ERR(parent); |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 372 | __hfs_brec_find(parent, fd, hfs_find_rec_by_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | hfs_bnode_dump(parent); |
| 374 | rec = fd->record; |
| 375 | |
| 376 | /* size difference between old and new key */ |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 377 | if ((tree->attributes & HFS_TREE_VARIDXKEYS) || |
| 378 | (tree->cnid == HFSPLUS_ATTR_CNID)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | newkeylen = hfs_bnode_read_u16(node, 14) + 2; |
| 380 | else |
| 381 | fd->keylength = newkeylen = tree->max_key_len + 2; |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 382 | hfs_dbg(BNODE_MOD, "update_rec: %d, %d, %d\n", |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 383 | rec, fd->keylength, newkeylen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
| 385 | rec_off = tree->node_size - (rec + 2) * 2; |
| 386 | end_rec_off = tree->node_size - (parent->num_recs + 1) * 2; |
| 387 | diff = newkeylen - fd->keylength; |
| 388 | if (!diff) |
| 389 | goto skip; |
| 390 | if (diff > 0) { |
| 391 | end_off = hfs_bnode_read_u16(parent, end_rec_off); |
| 392 | if (end_rec_off - end_off < diff) { |
| 393 | |
Joe Perches | c2b3e1f | 2013-04-30 15:27:54 -0700 | [diff] [blame] | 394 | hfs_dbg(BNODE_MOD, "splitting index node\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | fd->bnode = parent; |
| 396 | new_node = hfs_bnode_split(fd); |
| 397 | if (IS_ERR(new_node)) |
| 398 | return PTR_ERR(new_node); |
| 399 | parent = fd->bnode; |
| 400 | rec = fd->record; |
| 401 | rec_off = tree->node_size - (rec + 2) * 2; |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 402 | end_rec_off = tree->node_size - |
| 403 | (parent->num_recs + 1) * 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | } |
| 405 | } |
| 406 | |
| 407 | end_off = start_off = hfs_bnode_read_u16(parent, rec_off); |
| 408 | hfs_bnode_write_u16(parent, rec_off, start_off + diff); |
| 409 | start_off -= 4; /* move previous cnid too */ |
| 410 | |
| 411 | while (rec_off > end_rec_off) { |
| 412 | rec_off -= 2; |
| 413 | end_off = hfs_bnode_read_u16(parent, rec_off); |
| 414 | hfs_bnode_write_u16(parent, rec_off, end_off + diff); |
| 415 | } |
| 416 | hfs_bnode_move(parent, start_off + diff, start_off, |
| 417 | end_off - start_off); |
| 418 | skip: |
| 419 | hfs_bnode_copy(parent, fd->keyoffset, node, 14, newkeylen); |
| 420 | hfs_bnode_dump(parent); |
| 421 | |
| 422 | hfs_bnode_put(node); |
| 423 | node = parent; |
| 424 | |
| 425 | if (new_node) { |
| 426 | __be32 cnid; |
| 427 | |
| 428 | fd->bnode = hfs_bnode_find(tree, new_node->parent); |
| 429 | /* create index key and entry */ |
| 430 | hfs_bnode_read_key(new_node, fd->search_key, 14); |
| 431 | cnid = cpu_to_be32(new_node->this); |
| 432 | |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 433 | __hfs_brec_find(fd->bnode, fd, hfs_find_rec_by_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | hfs_brec_insert(fd, &cnid, sizeof(cnid)); |
| 435 | hfs_bnode_put(fd->bnode); |
| 436 | hfs_bnode_put(new_node); |
| 437 | |
| 438 | if (!rec) { |
| 439 | if (new_node == node) |
| 440 | goto out; |
| 441 | /* restore search_key */ |
| 442 | hfs_bnode_read_key(node, fd->search_key, 14); |
| 443 | } |
| 444 | } |
| 445 | |
| 446 | if (!rec && node->parent) |
| 447 | goto again; |
| 448 | out: |
| 449 | fd->bnode = node; |
| 450 | return 0; |
| 451 | } |
| 452 | |
| 453 | static int hfs_btree_inc_height(struct hfs_btree *tree) |
| 454 | { |
| 455 | struct hfs_bnode *node, *new_node; |
| 456 | struct hfs_bnode_desc node_desc; |
| 457 | int key_size, rec; |
| 458 | __be32 cnid; |
| 459 | |
| 460 | node = NULL; |
| 461 | if (tree->root) { |
| 462 | node = hfs_bnode_find(tree, tree->root); |
| 463 | if (IS_ERR(node)) |
| 464 | return PTR_ERR(node); |
| 465 | } |
| 466 | new_node = hfs_bmap_alloc(tree); |
| 467 | if (IS_ERR(new_node)) { |
| 468 | hfs_bnode_put(node); |
| 469 | return PTR_ERR(new_node); |
| 470 | } |
| 471 | |
| 472 | tree->root = new_node->this; |
| 473 | if (!tree->depth) { |
| 474 | tree->leaf_head = tree->leaf_tail = new_node->this; |
| 475 | new_node->type = HFS_NODE_LEAF; |
| 476 | new_node->num_recs = 0; |
| 477 | } else { |
| 478 | new_node->type = HFS_NODE_INDEX; |
| 479 | new_node->num_recs = 1; |
| 480 | } |
| 481 | new_node->parent = 0; |
| 482 | new_node->next = 0; |
| 483 | new_node->prev = 0; |
| 484 | new_node->height = ++tree->depth; |
| 485 | |
| 486 | node_desc.next = cpu_to_be32(new_node->next); |
| 487 | node_desc.prev = cpu_to_be32(new_node->prev); |
| 488 | node_desc.type = new_node->type; |
| 489 | node_desc.height = new_node->height; |
| 490 | node_desc.num_recs = cpu_to_be16(new_node->num_recs); |
| 491 | node_desc.reserved = 0; |
| 492 | hfs_bnode_write(new_node, &node_desc, 0, sizeof(node_desc)); |
| 493 | |
| 494 | rec = tree->node_size - 2; |
| 495 | hfs_bnode_write_u16(new_node, rec, 14); |
| 496 | |
| 497 | if (node) { |
| 498 | /* insert old root idx into new root */ |
| 499 | node->parent = tree->root; |
| 500 | if (node->type == HFS_NODE_LEAF || |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 501 | tree->attributes & HFS_TREE_VARIDXKEYS || |
| 502 | tree->cnid == HFSPLUS_ATTR_CNID) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | key_size = hfs_bnode_read_u16(node, 14) + 2; |
| 504 | else |
| 505 | key_size = tree->max_key_len + 2; |
| 506 | hfs_bnode_copy(new_node, 14, node, 14, key_size); |
| 507 | |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 508 | if (!(tree->attributes & HFS_TREE_VARIDXKEYS) && |
| 509 | (tree->cnid != HFSPLUS_ATTR_CNID)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | key_size = tree->max_key_len + 2; |
| 511 | hfs_bnode_write_u16(new_node, 14, tree->max_key_len); |
| 512 | } |
| 513 | cnid = cpu_to_be32(node->this); |
| 514 | hfs_bnode_write(new_node, &cnid, 14 + key_size, 4); |
| 515 | |
| 516 | rec -= 2; |
| 517 | hfs_bnode_write_u16(new_node, rec, 14 + key_size + 4); |
| 518 | |
| 519 | hfs_bnode_put(node); |
| 520 | } |
| 521 | hfs_bnode_put(new_node); |
| 522 | mark_inode_dirty(tree->inode); |
| 523 | |
| 524 | return 0; |
| 525 | } |