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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
a6b6e75e | 19 | #include <linux/sched.h> |
eb60ceac CM |
20 | #include "ctree.h" |
21 | #include "disk-io.h" | |
7f5c1516 | 22 | #include "transaction.h" |
5f39d397 | 23 | #include "print-tree.h" |
9a8dd150 | 24 | |
e089f05c CM |
25 | static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root |
26 | *root, struct btrfs_path *path, int level); | |
27 | static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root | |
d4dbff95 | 28 | *root, struct btrfs_key *ins_key, |
cc0c5538 | 29 | struct btrfs_path *path, int data_size, int extend); |
5f39d397 CM |
30 | static int push_node_left(struct btrfs_trans_handle *trans, |
31 | struct btrfs_root *root, struct extent_buffer *dst, | |
32 | struct extent_buffer *src); | |
33 | static int balance_node_right(struct btrfs_trans_handle *trans, | |
34 | struct btrfs_root *root, | |
35 | struct extent_buffer *dst_buf, | |
36 | struct extent_buffer *src_buf); | |
e089f05c CM |
37 | static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
38 | struct btrfs_path *path, int level, int slot); | |
d97e63b6 | 39 | |
df24a2b9 | 40 | inline void btrfs_init_path(struct btrfs_path *p) |
2c90e5d6 | 41 | { |
df24a2b9 | 42 | memset(p, 0, sizeof(*p)); |
2c90e5d6 CM |
43 | } |
44 | ||
df24a2b9 | 45 | struct btrfs_path *btrfs_alloc_path(void) |
2c90e5d6 | 46 | { |
df24a2b9 CM |
47 | struct btrfs_path *path; |
48 | path = kmem_cache_alloc(btrfs_path_cachep, GFP_NOFS); | |
2cc58cf2 | 49 | if (path) { |
df24a2b9 | 50 | btrfs_init_path(path); |
2cc58cf2 CM |
51 | path->reada = 1; |
52 | } | |
df24a2b9 | 53 | return path; |
2c90e5d6 CM |
54 | } |
55 | ||
df24a2b9 | 56 | void btrfs_free_path(struct btrfs_path *p) |
be0e5c09 | 57 | { |
df24a2b9 CM |
58 | btrfs_release_path(NULL, p); |
59 | kmem_cache_free(btrfs_path_cachep, p); | |
be0e5c09 CM |
60 | } |
61 | ||
234b63a0 | 62 | void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p) |
eb60ceac CM |
63 | { |
64 | int i; | |
234b63a0 | 65 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
eb60ceac CM |
66 | if (!p->nodes[i]) |
67 | break; | |
5f39d397 | 68 | free_extent_buffer(p->nodes[i]); |
eb60ceac | 69 | } |
aa5d6bed | 70 | memset(p, 0, sizeof(*p)); |
eb60ceac CM |
71 | } |
72 | ||
0b86a832 CM |
73 | static void add_root_to_dirty_list(struct btrfs_root *root) |
74 | { | |
75 | if (root->track_dirty && list_empty(&root->dirty_list)) { | |
76 | list_add(&root->dirty_list, | |
77 | &root->fs_info->dirty_cowonly_roots); | |
78 | } | |
79 | } | |
80 | ||
be20aa9d CM |
81 | int btrfs_copy_root(struct btrfs_trans_handle *trans, |
82 | struct btrfs_root *root, | |
83 | struct extent_buffer *buf, | |
84 | struct extent_buffer **cow_ret, u64 new_root_objectid) | |
85 | { | |
86 | struct extent_buffer *cow; | |
87 | u32 nritems; | |
88 | int ret = 0; | |
89 | int level; | |
90 | struct btrfs_key first_key; | |
4aec2b52 | 91 | struct btrfs_root *new_root; |
be20aa9d | 92 | |
4aec2b52 CM |
93 | new_root = kmalloc(sizeof(*new_root), GFP_NOFS); |
94 | if (!new_root) | |
95 | return -ENOMEM; | |
96 | ||
97 | memcpy(new_root, root, sizeof(*new_root)); | |
98 | new_root->root_key.objectid = new_root_objectid; | |
be20aa9d CM |
99 | |
100 | WARN_ON(root->ref_cows && trans->transid != | |
101 | root->fs_info->running_transaction->transid); | |
102 | WARN_ON(root->ref_cows && trans->transid != root->last_trans); | |
103 | ||
104 | level = btrfs_header_level(buf); | |
105 | nritems = btrfs_header_nritems(buf); | |
106 | if (nritems) { | |
107 | if (level == 0) | |
108 | btrfs_item_key_to_cpu(buf, &first_key, 0); | |
109 | else | |
110 | btrfs_node_key_to_cpu(buf, &first_key, 0); | |
111 | } else { | |
112 | first_key.objectid = 0; | |
113 | } | |
4aec2b52 | 114 | cow = __btrfs_alloc_free_block(trans, new_root, buf->len, |
be20aa9d CM |
115 | new_root_objectid, |
116 | trans->transid, first_key.objectid, | |
117 | level, buf->start, 0); | |
4aec2b52 CM |
118 | if (IS_ERR(cow)) { |
119 | kfree(new_root); | |
be20aa9d | 120 | return PTR_ERR(cow); |
4aec2b52 | 121 | } |
be20aa9d CM |
122 | |
123 | copy_extent_buffer(cow, buf, 0, 0, cow->len); | |
124 | btrfs_set_header_bytenr(cow, cow->start); | |
125 | btrfs_set_header_generation(cow, trans->transid); | |
126 | btrfs_set_header_owner(cow, new_root_objectid); | |
63b10fc4 | 127 | btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN); |
be20aa9d CM |
128 | |
129 | WARN_ON(btrfs_header_generation(buf) > trans->transid); | |
4aec2b52 CM |
130 | ret = btrfs_inc_ref(trans, new_root, buf); |
131 | kfree(new_root); | |
132 | ||
be20aa9d CM |
133 | if (ret) |
134 | return ret; | |
135 | ||
136 | btrfs_mark_buffer_dirty(cow); | |
137 | *cow_ret = cow; | |
138 | return 0; | |
139 | } | |
140 | ||
141 | int __btrfs_cow_block(struct btrfs_trans_handle *trans, | |
5f39d397 CM |
142 | struct btrfs_root *root, |
143 | struct extent_buffer *buf, | |
144 | struct extent_buffer *parent, int parent_slot, | |
145 | struct extent_buffer **cow_ret, | |
146 | u64 search_start, u64 empty_size) | |
02217ed2 | 147 | { |
7bb86316 | 148 | u64 root_gen; |
5f39d397 | 149 | struct extent_buffer *cow; |
7bb86316 | 150 | u32 nritems; |
6702ed49 CM |
151 | int ret = 0; |
152 | int different_trans = 0; | |
7bb86316 CM |
153 | int level; |
154 | struct btrfs_key first_key; | |
155 | ||
156 | if (root->ref_cows) { | |
157 | root_gen = trans->transid; | |
158 | } else { | |
159 | root_gen = 0; | |
160 | } | |
7bb86316 CM |
161 | WARN_ON(root->ref_cows && trans->transid != |
162 | root->fs_info->running_transaction->transid); | |
6702ed49 | 163 | WARN_ON(root->ref_cows && trans->transid != root->last_trans); |
5f39d397 | 164 | |
7bb86316 CM |
165 | level = btrfs_header_level(buf); |
166 | nritems = btrfs_header_nritems(buf); | |
167 | if (nritems) { | |
168 | if (level == 0) | |
169 | btrfs_item_key_to_cpu(buf, &first_key, 0); | |
170 | else | |
171 | btrfs_node_key_to_cpu(buf, &first_key, 0); | |
172 | } else { | |
173 | first_key.objectid = 0; | |
174 | } | |
175 | cow = __btrfs_alloc_free_block(trans, root, buf->len, | |
176 | root->root_key.objectid, | |
177 | root_gen, first_key.objectid, level, | |
db94535d | 178 | search_start, empty_size); |
54aa1f4d CM |
179 | if (IS_ERR(cow)) |
180 | return PTR_ERR(cow); | |
6702ed49 | 181 | |
5f39d397 | 182 | copy_extent_buffer(cow, buf, 0, 0, cow->len); |
db94535d | 183 | btrfs_set_header_bytenr(cow, cow->start); |
5f39d397 CM |
184 | btrfs_set_header_generation(cow, trans->transid); |
185 | btrfs_set_header_owner(cow, root->root_key.objectid); | |
63b10fc4 | 186 | btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN); |
6702ed49 | 187 | |
5f39d397 CM |
188 | WARN_ON(btrfs_header_generation(buf) > trans->transid); |
189 | if (btrfs_header_generation(buf) != trans->transid) { | |
6702ed49 CM |
190 | different_trans = 1; |
191 | ret = btrfs_inc_ref(trans, root, buf); | |
192 | if (ret) | |
193 | return ret; | |
194 | } else { | |
6702ed49 CM |
195 | clean_tree_block(trans, root, buf); |
196 | } | |
197 | ||
02217ed2 | 198 | if (buf == root->node) { |
7bb86316 | 199 | root_gen = btrfs_header_generation(buf); |
02217ed2 | 200 | root->node = cow; |
5f39d397 | 201 | extent_buffer_get(cow); |
2c90e5d6 | 202 | if (buf != root->commit_root) { |
db94535d | 203 | btrfs_free_extent(trans, root, buf->start, |
7bb86316 CM |
204 | buf->len, root->root_key.objectid, |
205 | root_gen, 0, 0, 1); | |
2c90e5d6 | 206 | } |
5f39d397 | 207 | free_extent_buffer(buf); |
0b86a832 | 208 | add_root_to_dirty_list(root); |
02217ed2 | 209 | } else { |
7bb86316 | 210 | root_gen = btrfs_header_generation(parent); |
5f39d397 | 211 | btrfs_set_node_blockptr(parent, parent_slot, |
db94535d | 212 | cow->start); |
74493f7a CM |
213 | WARN_ON(trans->transid == 0); |
214 | btrfs_set_node_ptr_generation(parent, parent_slot, | |
215 | trans->transid); | |
d6025579 | 216 | btrfs_mark_buffer_dirty(parent); |
5f39d397 | 217 | WARN_ON(btrfs_header_generation(parent) != trans->transid); |
7bb86316 CM |
218 | btrfs_free_extent(trans, root, buf->start, buf->len, |
219 | btrfs_header_owner(parent), root_gen, | |
220 | 0, 0, 1); | |
02217ed2 | 221 | } |
5f39d397 | 222 | free_extent_buffer(buf); |
ccd467d6 | 223 | btrfs_mark_buffer_dirty(cow); |
2c90e5d6 | 224 | *cow_ret = cow; |
02217ed2 CM |
225 | return 0; |
226 | } | |
227 | ||
5f39d397 CM |
228 | int btrfs_cow_block(struct btrfs_trans_handle *trans, |
229 | struct btrfs_root *root, struct extent_buffer *buf, | |
230 | struct extent_buffer *parent, int parent_slot, | |
231 | struct extent_buffer **cow_ret) | |
6702ed49 CM |
232 | { |
233 | u64 search_start; | |
dc17ff8f | 234 | u64 header_trans; |
f510cfec | 235 | int ret; |
dc17ff8f | 236 | |
6702ed49 CM |
237 | if (trans->transaction != root->fs_info->running_transaction) { |
238 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, | |
239 | root->fs_info->running_transaction->transid); | |
240 | WARN_ON(1); | |
241 | } | |
242 | if (trans->transid != root->fs_info->generation) { | |
243 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, | |
244 | root->fs_info->generation); | |
245 | WARN_ON(1); | |
246 | } | |
dc17ff8f CM |
247 | |
248 | header_trans = btrfs_header_generation(buf); | |
63b10fc4 CM |
249 | spin_lock(&root->fs_info->hash_lock); |
250 | if (header_trans == trans->transid && | |
251 | !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { | |
6702ed49 | 252 | *cow_ret = buf; |
63b10fc4 | 253 | spin_unlock(&root->fs_info->hash_lock); |
6702ed49 CM |
254 | return 0; |
255 | } | |
63b10fc4 | 256 | spin_unlock(&root->fs_info->hash_lock); |
0b86a832 | 257 | search_start = buf->start & ~((u64)(1024 * 1024 * 1024) - 1); |
f510cfec | 258 | ret = __btrfs_cow_block(trans, root, buf, parent, |
6702ed49 | 259 | parent_slot, cow_ret, search_start, 0); |
f510cfec | 260 | return ret; |
6702ed49 CM |
261 | } |
262 | ||
6b80053d | 263 | static int close_blocks(u64 blocknr, u64 other, u32 blocksize) |
6702ed49 | 264 | { |
6b80053d | 265 | if (blocknr < other && other - (blocknr + blocksize) < 32768) |
6702ed49 | 266 | return 1; |
6b80053d | 267 | if (blocknr > other && blocknr - (other + blocksize) < 32768) |
6702ed49 CM |
268 | return 1; |
269 | return 0; | |
270 | } | |
271 | ||
081e9573 CM |
272 | /* |
273 | * compare two keys in a memcmp fashion | |
274 | */ | |
275 | static int comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2) | |
276 | { | |
277 | struct btrfs_key k1; | |
278 | ||
279 | btrfs_disk_key_to_cpu(&k1, disk); | |
280 | ||
281 | if (k1.objectid > k2->objectid) | |
282 | return 1; | |
283 | if (k1.objectid < k2->objectid) | |
284 | return -1; | |
285 | if (k1.type > k2->type) | |
286 | return 1; | |
287 | if (k1.type < k2->type) | |
288 | return -1; | |
289 | if (k1.offset > k2->offset) | |
290 | return 1; | |
291 | if (k1.offset < k2->offset) | |
292 | return -1; | |
293 | return 0; | |
294 | } | |
295 | ||
296 | ||
6702ed49 | 297 | int btrfs_realloc_node(struct btrfs_trans_handle *trans, |
5f39d397 | 298 | struct btrfs_root *root, struct extent_buffer *parent, |
a6b6e75e CM |
299 | int start_slot, int cache_only, u64 *last_ret, |
300 | struct btrfs_key *progress) | |
6702ed49 | 301 | { |
6b80053d CM |
302 | struct extent_buffer *cur; |
303 | struct extent_buffer *tmp; | |
6702ed49 | 304 | u64 blocknr; |
e9d0b13b CM |
305 | u64 search_start = *last_ret; |
306 | u64 last_block = 0; | |
6702ed49 CM |
307 | u64 other; |
308 | u32 parent_nritems; | |
6702ed49 CM |
309 | int end_slot; |
310 | int i; | |
311 | int err = 0; | |
f2183bde | 312 | int parent_level; |
6b80053d CM |
313 | int uptodate; |
314 | u32 blocksize; | |
081e9573 CM |
315 | int progress_passed = 0; |
316 | struct btrfs_disk_key disk_key; | |
6702ed49 | 317 | |
5708b959 CM |
318 | parent_level = btrfs_header_level(parent); |
319 | if (cache_only && parent_level != 1) | |
320 | return 0; | |
321 | ||
6702ed49 CM |
322 | if (trans->transaction != root->fs_info->running_transaction) { |
323 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, | |
324 | root->fs_info->running_transaction->transid); | |
325 | WARN_ON(1); | |
326 | } | |
327 | if (trans->transid != root->fs_info->generation) { | |
328 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, | |
329 | root->fs_info->generation); | |
330 | WARN_ON(1); | |
331 | } | |
86479a04 | 332 | |
6b80053d | 333 | parent_nritems = btrfs_header_nritems(parent); |
6b80053d | 334 | blocksize = btrfs_level_size(root, parent_level - 1); |
6702ed49 CM |
335 | end_slot = parent_nritems; |
336 | ||
337 | if (parent_nritems == 1) | |
338 | return 0; | |
339 | ||
340 | for (i = start_slot; i < end_slot; i++) { | |
341 | int close = 1; | |
a6b6e75e | 342 | |
5708b959 CM |
343 | if (!parent->map_token) { |
344 | map_extent_buffer(parent, | |
345 | btrfs_node_key_ptr_offset(i), | |
346 | sizeof(struct btrfs_key_ptr), | |
347 | &parent->map_token, &parent->kaddr, | |
348 | &parent->map_start, &parent->map_len, | |
349 | KM_USER1); | |
350 | } | |
081e9573 CM |
351 | btrfs_node_key(parent, &disk_key, i); |
352 | if (!progress_passed && comp_keys(&disk_key, progress) < 0) | |
353 | continue; | |
354 | ||
355 | progress_passed = 1; | |
6b80053d | 356 | blocknr = btrfs_node_blockptr(parent, i); |
e9d0b13b CM |
357 | if (last_block == 0) |
358 | last_block = blocknr; | |
5708b959 | 359 | |
6702ed49 | 360 | if (i > 0) { |
6b80053d CM |
361 | other = btrfs_node_blockptr(parent, i - 1); |
362 | close = close_blocks(blocknr, other, blocksize); | |
6702ed49 | 363 | } |
5708b959 | 364 | if (close && i < end_slot - 2) { |
6b80053d CM |
365 | other = btrfs_node_blockptr(parent, i + 1); |
366 | close = close_blocks(blocknr, other, blocksize); | |
6702ed49 | 367 | } |
e9d0b13b CM |
368 | if (close) { |
369 | last_block = blocknr; | |
6702ed49 | 370 | continue; |
e9d0b13b | 371 | } |
5708b959 CM |
372 | if (parent->map_token) { |
373 | unmap_extent_buffer(parent, parent->map_token, | |
374 | KM_USER1); | |
375 | parent->map_token = NULL; | |
376 | } | |
6702ed49 | 377 | |
6b80053d CM |
378 | cur = btrfs_find_tree_block(root, blocknr, blocksize); |
379 | if (cur) | |
380 | uptodate = btrfs_buffer_uptodate(cur); | |
381 | else | |
382 | uptodate = 0; | |
5708b959 | 383 | if (!cur || !uptodate) { |
6702ed49 | 384 | if (cache_only) { |
6b80053d | 385 | free_extent_buffer(cur); |
6702ed49 CM |
386 | continue; |
387 | } | |
6b80053d CM |
388 | if (!cur) { |
389 | cur = read_tree_block(root, blocknr, | |
390 | blocksize); | |
391 | } else if (!uptodate) { | |
392 | btrfs_read_buffer(cur); | |
f2183bde | 393 | } |
6702ed49 | 394 | } |
e9d0b13b | 395 | if (search_start == 0) |
6b80053d | 396 | search_start = last_block; |
e9d0b13b | 397 | |
0999df54 | 398 | btrfs_verify_block_csum(root, cur); |
6b80053d CM |
399 | err = __btrfs_cow_block(trans, root, cur, parent, i, |
400 | &tmp, search_start, | |
401 | min(16 * blocksize, | |
402 | (end_slot - i) * blocksize)); | |
252c38f0 | 403 | if (err) { |
6b80053d | 404 | free_extent_buffer(cur); |
6702ed49 | 405 | break; |
252c38f0 | 406 | } |
6b80053d | 407 | search_start = tmp->start; |
5708b959 | 408 | last_block = tmp->start; |
f2183bde CM |
409 | *last_ret = search_start; |
410 | if (parent_level == 1) | |
6b80053d | 411 | btrfs_clear_buffer_defrag(tmp); |
6b80053d | 412 | free_extent_buffer(tmp); |
6702ed49 | 413 | } |
5708b959 CM |
414 | if (parent->map_token) { |
415 | unmap_extent_buffer(parent, parent->map_token, | |
416 | KM_USER1); | |
417 | parent->map_token = NULL; | |
418 | } | |
6702ed49 CM |
419 | return err; |
420 | } | |
421 | ||
74123bd7 CM |
422 | /* |
423 | * The leaf data grows from end-to-front in the node. | |
424 | * this returns the address of the start of the last item, | |
425 | * which is the stop of the leaf data stack | |
426 | */ | |
123abc88 | 427 | static inline unsigned int leaf_data_end(struct btrfs_root *root, |
5f39d397 | 428 | struct extent_buffer *leaf) |
be0e5c09 | 429 | { |
5f39d397 | 430 | u32 nr = btrfs_header_nritems(leaf); |
be0e5c09 | 431 | if (nr == 0) |
123abc88 | 432 | return BTRFS_LEAF_DATA_SIZE(root); |
5f39d397 | 433 | return btrfs_item_offset_nr(leaf, nr - 1); |
be0e5c09 CM |
434 | } |
435 | ||
123abc88 CM |
436 | static int check_node(struct btrfs_root *root, struct btrfs_path *path, |
437 | int level) | |
aa5d6bed | 438 | { |
5f39d397 CM |
439 | struct extent_buffer *parent = NULL; |
440 | struct extent_buffer *node = path->nodes[level]; | |
441 | struct btrfs_disk_key parent_key; | |
442 | struct btrfs_disk_key node_key; | |
aa5d6bed | 443 | int parent_slot; |
8d7be552 CM |
444 | int slot; |
445 | struct btrfs_key cpukey; | |
5f39d397 | 446 | u32 nritems = btrfs_header_nritems(node); |
aa5d6bed CM |
447 | |
448 | if (path->nodes[level + 1]) | |
5f39d397 | 449 | parent = path->nodes[level + 1]; |
a1f39630 | 450 | |
8d7be552 | 451 | slot = path->slots[level]; |
7518a238 CM |
452 | BUG_ON(nritems == 0); |
453 | if (parent) { | |
a1f39630 | 454 | parent_slot = path->slots[level + 1]; |
5f39d397 CM |
455 | btrfs_node_key(parent, &parent_key, parent_slot); |
456 | btrfs_node_key(node, &node_key, 0); | |
457 | BUG_ON(memcmp(&parent_key, &node_key, | |
e2fa7227 | 458 | sizeof(struct btrfs_disk_key))); |
1d4f8a0c | 459 | BUG_ON(btrfs_node_blockptr(parent, parent_slot) != |
db94535d | 460 | btrfs_header_bytenr(node)); |
aa5d6bed | 461 | } |
123abc88 | 462 | BUG_ON(nritems > BTRFS_NODEPTRS_PER_BLOCK(root)); |
8d7be552 | 463 | if (slot != 0) { |
5f39d397 CM |
464 | btrfs_node_key_to_cpu(node, &cpukey, slot - 1); |
465 | btrfs_node_key(node, &node_key, slot); | |
466 | BUG_ON(comp_keys(&node_key, &cpukey) <= 0); | |
8d7be552 CM |
467 | } |
468 | if (slot < nritems - 1) { | |
5f39d397 CM |
469 | btrfs_node_key_to_cpu(node, &cpukey, slot + 1); |
470 | btrfs_node_key(node, &node_key, slot); | |
471 | BUG_ON(comp_keys(&node_key, &cpukey) >= 0); | |
aa5d6bed CM |
472 | } |
473 | return 0; | |
474 | } | |
475 | ||
123abc88 CM |
476 | static int check_leaf(struct btrfs_root *root, struct btrfs_path *path, |
477 | int level) | |
aa5d6bed | 478 | { |
5f39d397 CM |
479 | struct extent_buffer *leaf = path->nodes[level]; |
480 | struct extent_buffer *parent = NULL; | |
aa5d6bed | 481 | int parent_slot; |
8d7be552 | 482 | struct btrfs_key cpukey; |
5f39d397 CM |
483 | struct btrfs_disk_key parent_key; |
484 | struct btrfs_disk_key leaf_key; | |
485 | int slot = path->slots[0]; | |
8d7be552 | 486 | |
5f39d397 | 487 | u32 nritems = btrfs_header_nritems(leaf); |
aa5d6bed CM |
488 | |
489 | if (path->nodes[level + 1]) | |
5f39d397 | 490 | parent = path->nodes[level + 1]; |
7518a238 CM |
491 | |
492 | if (nritems == 0) | |
493 | return 0; | |
494 | ||
495 | if (parent) { | |
a1f39630 | 496 | parent_slot = path->slots[level + 1]; |
5f39d397 CM |
497 | btrfs_node_key(parent, &parent_key, parent_slot); |
498 | btrfs_item_key(leaf, &leaf_key, 0); | |
6702ed49 | 499 | |
5f39d397 | 500 | BUG_ON(memcmp(&parent_key, &leaf_key, |
e2fa7227 | 501 | sizeof(struct btrfs_disk_key))); |
1d4f8a0c | 502 | BUG_ON(btrfs_node_blockptr(parent, parent_slot) != |
db94535d | 503 | btrfs_header_bytenr(leaf)); |
5f39d397 CM |
504 | } |
505 | #if 0 | |
506 | for (i = 0; nritems > 1 && i < nritems - 2; i++) { | |
507 | btrfs_item_key_to_cpu(leaf, &cpukey, i + 1); | |
508 | btrfs_item_key(leaf, &leaf_key, i); | |
509 | if (comp_keys(&leaf_key, &cpukey) >= 0) { | |
510 | btrfs_print_leaf(root, leaf); | |
511 | printk("slot %d offset bad key\n", i); | |
512 | BUG_ON(1); | |
513 | } | |
514 | if (btrfs_item_offset_nr(leaf, i) != | |
515 | btrfs_item_end_nr(leaf, i + 1)) { | |
516 | btrfs_print_leaf(root, leaf); | |
517 | printk("slot %d offset bad\n", i); | |
518 | BUG_ON(1); | |
519 | } | |
520 | if (i == 0) { | |
521 | if (btrfs_item_offset_nr(leaf, i) + | |
522 | btrfs_item_size_nr(leaf, i) != | |
523 | BTRFS_LEAF_DATA_SIZE(root)) { | |
524 | btrfs_print_leaf(root, leaf); | |
525 | printk("slot %d first offset bad\n", i); | |
526 | BUG_ON(1); | |
527 | } | |
528 | } | |
aa5d6bed | 529 | } |
5f39d397 CM |
530 | if (nritems > 0) { |
531 | if (btrfs_item_size_nr(leaf, nritems - 1) > 4096) { | |
532 | btrfs_print_leaf(root, leaf); | |
533 | printk("slot %d bad size \n", nritems - 1); | |
534 | BUG_ON(1); | |
535 | } | |
536 | } | |
537 | #endif | |
538 | if (slot != 0 && slot < nritems - 1) { | |
539 | btrfs_item_key(leaf, &leaf_key, slot); | |
540 | btrfs_item_key_to_cpu(leaf, &cpukey, slot - 1); | |
541 | if (comp_keys(&leaf_key, &cpukey) <= 0) { | |
542 | btrfs_print_leaf(root, leaf); | |
543 | printk("slot %d offset bad key\n", slot); | |
544 | BUG_ON(1); | |
545 | } | |
546 | if (btrfs_item_offset_nr(leaf, slot - 1) != | |
547 | btrfs_item_end_nr(leaf, slot)) { | |
548 | btrfs_print_leaf(root, leaf); | |
549 | printk("slot %d offset bad\n", slot); | |
550 | BUG_ON(1); | |
551 | } | |
8d7be552 CM |
552 | } |
553 | if (slot < nritems - 1) { | |
5f39d397 CM |
554 | btrfs_item_key(leaf, &leaf_key, slot); |
555 | btrfs_item_key_to_cpu(leaf, &cpukey, slot + 1); | |
556 | BUG_ON(comp_keys(&leaf_key, &cpukey) >= 0); | |
557 | if (btrfs_item_offset_nr(leaf, slot) != | |
558 | btrfs_item_end_nr(leaf, slot + 1)) { | |
559 | btrfs_print_leaf(root, leaf); | |
560 | printk("slot %d offset bad\n", slot); | |
561 | BUG_ON(1); | |
562 | } | |
aa5d6bed | 563 | } |
5f39d397 CM |
564 | BUG_ON(btrfs_item_offset_nr(leaf, 0) + |
565 | btrfs_item_size_nr(leaf, 0) != BTRFS_LEAF_DATA_SIZE(root)); | |
aa5d6bed CM |
566 | return 0; |
567 | } | |
568 | ||
98ed5174 CM |
569 | static int noinline check_block(struct btrfs_root *root, |
570 | struct btrfs_path *path, int level) | |
aa5d6bed | 571 | { |
810191ff | 572 | return 0; |
db94535d | 573 | #if 0 |
5f39d397 | 574 | struct extent_buffer *buf = path->nodes[level]; |
5f39d397 | 575 | |
479965d6 CM |
576 | if (memcmp_extent_buffer(buf, root->fs_info->fsid, |
577 | (unsigned long)btrfs_header_fsid(buf), | |
578 | BTRFS_FSID_SIZE)) { | |
5f39d397 | 579 | printk("warning bad block %Lu\n", buf->start); |
db94535d | 580 | return 1; |
5f39d397 | 581 | } |
db94535d | 582 | #endif |
aa5d6bed | 583 | if (level == 0) |
123abc88 CM |
584 | return check_leaf(root, path, level); |
585 | return check_node(root, path, level); | |
aa5d6bed CM |
586 | } |
587 | ||
74123bd7 | 588 | /* |
5f39d397 CM |
589 | * search for key in the extent_buffer. The items start at offset p, |
590 | * and they are item_size apart. There are 'max' items in p. | |
591 | * | |
74123bd7 CM |
592 | * the slot in the array is returned via slot, and it points to |
593 | * the place where you would insert key if it is not found in | |
594 | * the array. | |
595 | * | |
596 | * slot may point to max if the key is bigger than all of the keys | |
597 | */ | |
5f39d397 CM |
598 | static int generic_bin_search(struct extent_buffer *eb, unsigned long p, |
599 | int item_size, struct btrfs_key *key, | |
600 | int max, int *slot) | |
be0e5c09 CM |
601 | { |
602 | int low = 0; | |
603 | int high = max; | |
604 | int mid; | |
605 | int ret; | |
479965d6 | 606 | struct btrfs_disk_key *tmp = NULL; |
5f39d397 CM |
607 | struct btrfs_disk_key unaligned; |
608 | unsigned long offset; | |
609 | char *map_token = NULL; | |
610 | char *kaddr = NULL; | |
611 | unsigned long map_start = 0; | |
612 | unsigned long map_len = 0; | |
479965d6 | 613 | int err; |
be0e5c09 CM |
614 | |
615 | while(low < high) { | |
616 | mid = (low + high) / 2; | |
5f39d397 CM |
617 | offset = p + mid * item_size; |
618 | ||
619 | if (!map_token || offset < map_start || | |
620 | (offset + sizeof(struct btrfs_disk_key)) > | |
621 | map_start + map_len) { | |
479965d6 | 622 | if (map_token) { |
5f39d397 | 623 | unmap_extent_buffer(eb, map_token, KM_USER0); |
479965d6 CM |
624 | map_token = NULL; |
625 | } | |
626 | err = map_extent_buffer(eb, offset, | |
627 | sizeof(struct btrfs_disk_key), | |
628 | &map_token, &kaddr, | |
629 | &map_start, &map_len, KM_USER0); | |
630 | ||
631 | if (!err) { | |
632 | tmp = (struct btrfs_disk_key *)(kaddr + offset - | |
633 | map_start); | |
634 | } else { | |
635 | read_extent_buffer(eb, &unaligned, | |
636 | offset, sizeof(unaligned)); | |
637 | tmp = &unaligned; | |
638 | } | |
5f39d397 | 639 | |
5f39d397 CM |
640 | } else { |
641 | tmp = (struct btrfs_disk_key *)(kaddr + offset - | |
642 | map_start); | |
643 | } | |
be0e5c09 CM |
644 | ret = comp_keys(tmp, key); |
645 | ||
646 | if (ret < 0) | |
647 | low = mid + 1; | |
648 | else if (ret > 0) | |
649 | high = mid; | |
650 | else { | |
651 | *slot = mid; | |
479965d6 CM |
652 | if (map_token) |
653 | unmap_extent_buffer(eb, map_token, KM_USER0); | |
be0e5c09 CM |
654 | return 0; |
655 | } | |
656 | } | |
657 | *slot = low; | |
5f39d397 CM |
658 | if (map_token) |
659 | unmap_extent_buffer(eb, map_token, KM_USER0); | |
be0e5c09 CM |
660 | return 1; |
661 | } | |
662 | ||
97571fd0 CM |
663 | /* |
664 | * simple bin_search frontend that does the right thing for | |
665 | * leaves vs nodes | |
666 | */ | |
5f39d397 CM |
667 | static int bin_search(struct extent_buffer *eb, struct btrfs_key *key, |
668 | int level, int *slot) | |
be0e5c09 | 669 | { |
5f39d397 CM |
670 | if (level == 0) { |
671 | return generic_bin_search(eb, | |
672 | offsetof(struct btrfs_leaf, items), | |
0783fcfc | 673 | sizeof(struct btrfs_item), |
5f39d397 | 674 | key, btrfs_header_nritems(eb), |
7518a238 | 675 | slot); |
be0e5c09 | 676 | } else { |
5f39d397 CM |
677 | return generic_bin_search(eb, |
678 | offsetof(struct btrfs_node, ptrs), | |
123abc88 | 679 | sizeof(struct btrfs_key_ptr), |
5f39d397 | 680 | key, btrfs_header_nritems(eb), |
7518a238 | 681 | slot); |
be0e5c09 CM |
682 | } |
683 | return -1; | |
684 | } | |
685 | ||
5f39d397 CM |
686 | static struct extent_buffer *read_node_slot(struct btrfs_root *root, |
687 | struct extent_buffer *parent, int slot) | |
bb803951 | 688 | { |
bb803951 CM |
689 | if (slot < 0) |
690 | return NULL; | |
5f39d397 | 691 | if (slot >= btrfs_header_nritems(parent)) |
bb803951 | 692 | return NULL; |
db94535d CM |
693 | return read_tree_block(root, btrfs_node_blockptr(parent, slot), |
694 | btrfs_level_size(root, btrfs_header_level(parent) - 1)); | |
bb803951 CM |
695 | } |
696 | ||
98ed5174 CM |
697 | static int balance_level(struct btrfs_trans_handle *trans, |
698 | struct btrfs_root *root, | |
699 | struct btrfs_path *path, int level) | |
bb803951 | 700 | { |
5f39d397 CM |
701 | struct extent_buffer *right = NULL; |
702 | struct extent_buffer *mid; | |
703 | struct extent_buffer *left = NULL; | |
704 | struct extent_buffer *parent = NULL; | |
bb803951 CM |
705 | int ret = 0; |
706 | int wret; | |
707 | int pslot; | |
bb803951 | 708 | int orig_slot = path->slots[level]; |
54aa1f4d | 709 | int err_on_enospc = 0; |
79f95c82 | 710 | u64 orig_ptr; |
bb803951 CM |
711 | |
712 | if (level == 0) | |
713 | return 0; | |
714 | ||
5f39d397 | 715 | mid = path->nodes[level]; |
7bb86316 CM |
716 | WARN_ON(btrfs_header_generation(mid) != trans->transid); |
717 | ||
1d4f8a0c | 718 | orig_ptr = btrfs_node_blockptr(mid, orig_slot); |
79f95c82 | 719 | |
234b63a0 | 720 | if (level < BTRFS_MAX_LEVEL - 1) |
5f39d397 | 721 | parent = path->nodes[level + 1]; |
bb803951 CM |
722 | pslot = path->slots[level + 1]; |
723 | ||
40689478 CM |
724 | /* |
725 | * deal with the case where there is only one pointer in the root | |
726 | * by promoting the node below to a root | |
727 | */ | |
5f39d397 CM |
728 | if (!parent) { |
729 | struct extent_buffer *child; | |
bb803951 | 730 | |
5f39d397 | 731 | if (btrfs_header_nritems(mid) != 1) |
bb803951 CM |
732 | return 0; |
733 | ||
734 | /* promote the child to a root */ | |
5f39d397 | 735 | child = read_node_slot(root, mid, 0); |
bb803951 | 736 | BUG_ON(!child); |
2f375ab9 Y |
737 | ret = btrfs_cow_block(trans, root, child, mid, 0, &child); |
738 | BUG_ON(ret); | |
739 | ||
bb803951 | 740 | root->node = child; |
0b86a832 | 741 | add_root_to_dirty_list(root); |
bb803951 | 742 | path->nodes[level] = NULL; |
5f39d397 CM |
743 | clean_tree_block(trans, root, mid); |
744 | wait_on_tree_block_writeback(root, mid); | |
bb803951 | 745 | /* once for the path */ |
5f39d397 | 746 | free_extent_buffer(mid); |
7bb86316 CM |
747 | ret = btrfs_free_extent(trans, root, mid->start, mid->len, |
748 | root->root_key.objectid, | |
749 | btrfs_header_generation(mid), 0, 0, 1); | |
bb803951 | 750 | /* once for the root ptr */ |
5f39d397 | 751 | free_extent_buffer(mid); |
db94535d | 752 | return ret; |
bb803951 | 753 | } |
5f39d397 | 754 | if (btrfs_header_nritems(mid) > |
123abc88 | 755 | BTRFS_NODEPTRS_PER_BLOCK(root) / 4) |
bb803951 CM |
756 | return 0; |
757 | ||
5f39d397 | 758 | if (btrfs_header_nritems(mid) < 2) |
54aa1f4d CM |
759 | err_on_enospc = 1; |
760 | ||
5f39d397 CM |
761 | left = read_node_slot(root, parent, pslot - 1); |
762 | if (left) { | |
763 | wret = btrfs_cow_block(trans, root, left, | |
764 | parent, pslot - 1, &left); | |
54aa1f4d CM |
765 | if (wret) { |
766 | ret = wret; | |
767 | goto enospc; | |
768 | } | |
2cc58cf2 | 769 | } |
5f39d397 CM |
770 | right = read_node_slot(root, parent, pslot + 1); |
771 | if (right) { | |
772 | wret = btrfs_cow_block(trans, root, right, | |
773 | parent, pslot + 1, &right); | |
2cc58cf2 CM |
774 | if (wret) { |
775 | ret = wret; | |
776 | goto enospc; | |
777 | } | |
778 | } | |
779 | ||
780 | /* first, try to make some room in the middle buffer */ | |
5f39d397 CM |
781 | if (left) { |
782 | orig_slot += btrfs_header_nritems(left); | |
783 | wret = push_node_left(trans, root, left, mid); | |
79f95c82 CM |
784 | if (wret < 0) |
785 | ret = wret; | |
5f39d397 | 786 | if (btrfs_header_nritems(mid) < 2) |
54aa1f4d | 787 | err_on_enospc = 1; |
bb803951 | 788 | } |
79f95c82 CM |
789 | |
790 | /* | |
791 | * then try to empty the right most buffer into the middle | |
792 | */ | |
5f39d397 CM |
793 | if (right) { |
794 | wret = push_node_left(trans, root, mid, right); | |
54aa1f4d | 795 | if (wret < 0 && wret != -ENOSPC) |
79f95c82 | 796 | ret = wret; |
5f39d397 | 797 | if (btrfs_header_nritems(right) == 0) { |
db94535d | 798 | u64 bytenr = right->start; |
7bb86316 | 799 | u64 generation = btrfs_header_generation(parent); |
db94535d CM |
800 | u32 blocksize = right->len; |
801 | ||
5f39d397 CM |
802 | clean_tree_block(trans, root, right); |
803 | wait_on_tree_block_writeback(root, right); | |
804 | free_extent_buffer(right); | |
bb803951 | 805 | right = NULL; |
e089f05c CM |
806 | wret = del_ptr(trans, root, path, level + 1, pslot + |
807 | 1); | |
bb803951 CM |
808 | if (wret) |
809 | ret = wret; | |
db94535d | 810 | wret = btrfs_free_extent(trans, root, bytenr, |
7bb86316 CM |
811 | blocksize, |
812 | btrfs_header_owner(parent), | |
813 | generation, 0, 0, 1); | |
bb803951 CM |
814 | if (wret) |
815 | ret = wret; | |
816 | } else { | |
5f39d397 CM |
817 | struct btrfs_disk_key right_key; |
818 | btrfs_node_key(right, &right_key, 0); | |
819 | btrfs_set_node_key(parent, &right_key, pslot + 1); | |
820 | btrfs_mark_buffer_dirty(parent); | |
bb803951 CM |
821 | } |
822 | } | |
5f39d397 | 823 | if (btrfs_header_nritems(mid) == 1) { |
79f95c82 CM |
824 | /* |
825 | * we're not allowed to leave a node with one item in the | |
826 | * tree during a delete. A deletion from lower in the tree | |
827 | * could try to delete the only pointer in this node. | |
828 | * So, pull some keys from the left. | |
829 | * There has to be a left pointer at this point because | |
830 | * otherwise we would have pulled some pointers from the | |
831 | * right | |
832 | */ | |
5f39d397 CM |
833 | BUG_ON(!left); |
834 | wret = balance_node_right(trans, root, mid, left); | |
54aa1f4d | 835 | if (wret < 0) { |
79f95c82 | 836 | ret = wret; |
54aa1f4d CM |
837 | goto enospc; |
838 | } | |
79f95c82 CM |
839 | BUG_ON(wret == 1); |
840 | } | |
5f39d397 | 841 | if (btrfs_header_nritems(mid) == 0) { |
79f95c82 | 842 | /* we've managed to empty the middle node, drop it */ |
7bb86316 | 843 | u64 root_gen = btrfs_header_generation(parent); |
db94535d CM |
844 | u64 bytenr = mid->start; |
845 | u32 blocksize = mid->len; | |
5f39d397 CM |
846 | clean_tree_block(trans, root, mid); |
847 | wait_on_tree_block_writeback(root, mid); | |
848 | free_extent_buffer(mid); | |
bb803951 | 849 | mid = NULL; |
e089f05c | 850 | wret = del_ptr(trans, root, path, level + 1, pslot); |
bb803951 CM |
851 | if (wret) |
852 | ret = wret; | |
7bb86316 CM |
853 | wret = btrfs_free_extent(trans, root, bytenr, blocksize, |
854 | btrfs_header_owner(parent), | |
855 | root_gen, 0, 0, 1); | |
bb803951 CM |
856 | if (wret) |
857 | ret = wret; | |
79f95c82 CM |
858 | } else { |
859 | /* update the parent key to reflect our changes */ | |
5f39d397 CM |
860 | struct btrfs_disk_key mid_key; |
861 | btrfs_node_key(mid, &mid_key, 0); | |
862 | btrfs_set_node_key(parent, &mid_key, pslot); | |
863 | btrfs_mark_buffer_dirty(parent); | |
79f95c82 | 864 | } |
bb803951 | 865 | |
79f95c82 | 866 | /* update the path */ |
5f39d397 CM |
867 | if (left) { |
868 | if (btrfs_header_nritems(left) > orig_slot) { | |
869 | extent_buffer_get(left); | |
870 | path->nodes[level] = left; | |
bb803951 CM |
871 | path->slots[level + 1] -= 1; |
872 | path->slots[level] = orig_slot; | |
5f39d397 CM |
873 | if (mid) |
874 | free_extent_buffer(mid); | |
bb803951 | 875 | } else { |
5f39d397 | 876 | orig_slot -= btrfs_header_nritems(left); |
bb803951 CM |
877 | path->slots[level] = orig_slot; |
878 | } | |
879 | } | |
79f95c82 | 880 | /* double check we haven't messed things up */ |
123abc88 | 881 | check_block(root, path, level); |
e20d96d6 | 882 | if (orig_ptr != |
5f39d397 | 883 | btrfs_node_blockptr(path->nodes[level], path->slots[level])) |
79f95c82 | 884 | BUG(); |
54aa1f4d | 885 | enospc: |
5f39d397 CM |
886 | if (right) |
887 | free_extent_buffer(right); | |
888 | if (left) | |
889 | free_extent_buffer(left); | |
bb803951 CM |
890 | return ret; |
891 | } | |
892 | ||
e66f709b | 893 | /* returns zero if the push worked, non-zero otherwise */ |
98ed5174 CM |
894 | static int noinline push_nodes_for_insert(struct btrfs_trans_handle *trans, |
895 | struct btrfs_root *root, | |
896 | struct btrfs_path *path, int level) | |
e66f709b | 897 | { |
5f39d397 CM |
898 | struct extent_buffer *right = NULL; |
899 | struct extent_buffer *mid; | |
900 | struct extent_buffer *left = NULL; | |
901 | struct extent_buffer *parent = NULL; | |
e66f709b CM |
902 | int ret = 0; |
903 | int wret; | |
904 | int pslot; | |
905 | int orig_slot = path->slots[level]; | |
906 | u64 orig_ptr; | |
907 | ||
908 | if (level == 0) | |
909 | return 1; | |
910 | ||
5f39d397 | 911 | mid = path->nodes[level]; |
7bb86316 | 912 | WARN_ON(btrfs_header_generation(mid) != trans->transid); |
e66f709b CM |
913 | orig_ptr = btrfs_node_blockptr(mid, orig_slot); |
914 | ||
915 | if (level < BTRFS_MAX_LEVEL - 1) | |
5f39d397 | 916 | parent = path->nodes[level + 1]; |
e66f709b CM |
917 | pslot = path->slots[level + 1]; |
918 | ||
5f39d397 | 919 | if (!parent) |
e66f709b | 920 | return 1; |
e66f709b | 921 | |
5f39d397 | 922 | left = read_node_slot(root, parent, pslot - 1); |
e66f709b CM |
923 | |
924 | /* first, try to make some room in the middle buffer */ | |
5f39d397 | 925 | if (left) { |
e66f709b | 926 | u32 left_nr; |
5f39d397 | 927 | left_nr = btrfs_header_nritems(left); |
33ade1f8 CM |
928 | if (left_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) { |
929 | wret = 1; | |
930 | } else { | |
5f39d397 CM |
931 | ret = btrfs_cow_block(trans, root, left, parent, |
932 | pslot - 1, &left); | |
54aa1f4d CM |
933 | if (ret) |
934 | wret = 1; | |
935 | else { | |
54aa1f4d | 936 | wret = push_node_left(trans, root, |
5f39d397 | 937 | left, mid); |
54aa1f4d | 938 | } |
33ade1f8 | 939 | } |
e66f709b CM |
940 | if (wret < 0) |
941 | ret = wret; | |
942 | if (wret == 0) { | |
5f39d397 | 943 | struct btrfs_disk_key disk_key; |
e66f709b | 944 | orig_slot += left_nr; |
5f39d397 CM |
945 | btrfs_node_key(mid, &disk_key, 0); |
946 | btrfs_set_node_key(parent, &disk_key, pslot); | |
947 | btrfs_mark_buffer_dirty(parent); | |
948 | if (btrfs_header_nritems(left) > orig_slot) { | |
949 | path->nodes[level] = left; | |
e66f709b CM |
950 | path->slots[level + 1] -= 1; |
951 | path->slots[level] = orig_slot; | |
5f39d397 | 952 | free_extent_buffer(mid); |
e66f709b CM |
953 | } else { |
954 | orig_slot -= | |
5f39d397 | 955 | btrfs_header_nritems(left); |
e66f709b | 956 | path->slots[level] = orig_slot; |
5f39d397 | 957 | free_extent_buffer(left); |
e66f709b | 958 | } |
e66f709b CM |
959 | return 0; |
960 | } | |
5f39d397 | 961 | free_extent_buffer(left); |
e66f709b | 962 | } |
5f39d397 | 963 | right= read_node_slot(root, parent, pslot + 1); |
e66f709b CM |
964 | |
965 | /* | |
966 | * then try to empty the right most buffer into the middle | |
967 | */ | |
5f39d397 | 968 | if (right) { |
33ade1f8 | 969 | u32 right_nr; |
5f39d397 | 970 | right_nr = btrfs_header_nritems(right); |
33ade1f8 CM |
971 | if (right_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) { |
972 | wret = 1; | |
973 | } else { | |
5f39d397 CM |
974 | ret = btrfs_cow_block(trans, root, right, |
975 | parent, pslot + 1, | |
976 | &right); | |
54aa1f4d CM |
977 | if (ret) |
978 | wret = 1; | |
979 | else { | |
54aa1f4d | 980 | wret = balance_node_right(trans, root, |
5f39d397 | 981 | right, mid); |
54aa1f4d | 982 | } |
33ade1f8 | 983 | } |
e66f709b CM |
984 | if (wret < 0) |
985 | ret = wret; | |
986 | if (wret == 0) { | |
5f39d397 CM |
987 | struct btrfs_disk_key disk_key; |
988 | ||
989 | btrfs_node_key(right, &disk_key, 0); | |
990 | btrfs_set_node_key(parent, &disk_key, pslot + 1); | |
991 | btrfs_mark_buffer_dirty(parent); | |
992 | ||
993 | if (btrfs_header_nritems(mid) <= orig_slot) { | |
994 | path->nodes[level] = right; | |
e66f709b CM |
995 | path->slots[level + 1] += 1; |
996 | path->slots[level] = orig_slot - | |
5f39d397 CM |
997 | btrfs_header_nritems(mid); |
998 | free_extent_buffer(mid); | |
e66f709b | 999 | } else { |
5f39d397 | 1000 | free_extent_buffer(right); |
e66f709b | 1001 | } |
e66f709b CM |
1002 | return 0; |
1003 | } | |
5f39d397 | 1004 | free_extent_buffer(right); |
e66f709b | 1005 | } |
e66f709b CM |
1006 | return 1; |
1007 | } | |
1008 | ||
3c69faec CM |
1009 | /* |
1010 | * readahead one full node of leaves | |
1011 | */ | |
1012 | static void reada_for_search(struct btrfs_root *root, struct btrfs_path *path, | |
01f46658 | 1013 | int level, int slot, u64 objectid) |
3c69faec | 1014 | { |
5f39d397 | 1015 | struct extent_buffer *node; |
01f46658 | 1016 | struct btrfs_disk_key disk_key; |
3c69faec | 1017 | u32 nritems; |
3c69faec | 1018 | u64 search; |
6b80053d CM |
1019 | u64 lowest_read; |
1020 | u64 highest_read; | |
1021 | u64 nread = 0; | |
3c69faec | 1022 | int direction = path->reada; |
5f39d397 | 1023 | struct extent_buffer *eb; |
6b80053d CM |
1024 | u32 nr; |
1025 | u32 blocksize; | |
1026 | u32 nscan = 0; | |
db94535d | 1027 | |
a6b6e75e | 1028 | if (level != 1) |
6702ed49 CM |
1029 | return; |
1030 | ||
1031 | if (!path->nodes[level]) | |
3c69faec CM |
1032 | return; |
1033 | ||
5f39d397 | 1034 | node = path->nodes[level]; |
3c69faec | 1035 | search = btrfs_node_blockptr(node, slot); |
6b80053d CM |
1036 | blocksize = btrfs_level_size(root, level - 1); |
1037 | eb = btrfs_find_tree_block(root, search, blocksize); | |
5f39d397 CM |
1038 | if (eb) { |
1039 | free_extent_buffer(eb); | |
3c69faec CM |
1040 | return; |
1041 | } | |
1042 | ||
6b80053d CM |
1043 | highest_read = search; |
1044 | lowest_read = search; | |
1045 | ||
5f39d397 | 1046 | nritems = btrfs_header_nritems(node); |
6b80053d | 1047 | nr = slot; |
3c69faec | 1048 | while(1) { |
6b80053d CM |
1049 | if (direction < 0) { |
1050 | if (nr == 0) | |
1051 | break; | |
1052 | nr--; | |
1053 | } else if (direction > 0) { | |
1054 | nr++; | |
1055 | if (nr >= nritems) | |
1056 | break; | |
3c69faec | 1057 | } |
01f46658 CM |
1058 | if (path->reada < 0 && objectid) { |
1059 | btrfs_node_key(node, &disk_key, nr); | |
1060 | if (btrfs_disk_key_objectid(&disk_key) != objectid) | |
1061 | break; | |
1062 | } | |
6b80053d CM |
1063 | search = btrfs_node_blockptr(node, nr); |
1064 | if ((search >= lowest_read && search <= highest_read) || | |
1065 | (search < lowest_read && lowest_read - search <= 32768) || | |
1066 | (search > highest_read && search - highest_read <= 32768)) { | |
1067 | readahead_tree_block(root, search, blocksize); | |
1068 | nread += blocksize; | |
1069 | } | |
1070 | nscan++; | |
1071 | if (path->reada < 2 && (nread > (256 * 1024) || nscan > 32)) | |
1072 | break; | |
1073 | if(nread > (1024 * 1024) || nscan > 128) | |
1074 | break; | |
1075 | ||
1076 | if (search < lowest_read) | |
1077 | lowest_read = search; | |
1078 | if (search > highest_read) | |
1079 | highest_read = search; | |
3c69faec CM |
1080 | } |
1081 | } | |
74123bd7 CM |
1082 | /* |
1083 | * look for key in the tree. path is filled in with nodes along the way | |
1084 | * if key is found, we return zero and you can find the item in the leaf | |
1085 | * level of the path (level 0) | |
1086 | * | |
1087 | * If the key isn't found, the path points to the slot where it should | |
aa5d6bed CM |
1088 | * be inserted, and 1 is returned. If there are other errors during the |
1089 | * search a negative error number is returned. | |
97571fd0 CM |
1090 | * |
1091 | * if ins_len > 0, nodes and leaves will be split as we walk down the | |
1092 | * tree. if ins_len < 0, nodes will be merged as we walk down the tree (if | |
1093 | * possible) | |
74123bd7 | 1094 | */ |
e089f05c CM |
1095 | int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root |
1096 | *root, struct btrfs_key *key, struct btrfs_path *p, int | |
1097 | ins_len, int cow) | |
be0e5c09 | 1098 | { |
5f39d397 | 1099 | struct extent_buffer *b; |
db94535d | 1100 | u64 bytenr; |
74493f7a | 1101 | u64 ptr_gen; |
be0e5c09 CM |
1102 | int slot; |
1103 | int ret; | |
1104 | int level; | |
3c69faec | 1105 | int should_reada = p->reada; |
9f3a7427 CM |
1106 | u8 lowest_level = 0; |
1107 | ||
6702ed49 CM |
1108 | lowest_level = p->lowest_level; |
1109 | WARN_ON(lowest_level && ins_len); | |
22b0ebda CM |
1110 | WARN_ON(p->nodes[0] != NULL); |
1111 | WARN_ON(!mutex_is_locked(&root->fs_info->fs_mutex)); | |
bb803951 CM |
1112 | again: |
1113 | b = root->node; | |
5f39d397 | 1114 | extent_buffer_get(b); |
eb60ceac | 1115 | while (b) { |
5f39d397 | 1116 | level = btrfs_header_level(b); |
02217ed2 CM |
1117 | if (cow) { |
1118 | int wret; | |
e20d96d6 CM |
1119 | wret = btrfs_cow_block(trans, root, b, |
1120 | p->nodes[level + 1], | |
1121 | p->slots[level + 1], | |
252c38f0 | 1122 | &b); |
54aa1f4d | 1123 | if (wret) { |
5f39d397 | 1124 | free_extent_buffer(b); |
54aa1f4d CM |
1125 | return wret; |
1126 | } | |
02217ed2 CM |
1127 | } |
1128 | BUG_ON(!cow && ins_len); | |
5f39d397 | 1129 | if (level != btrfs_header_level(b)) |
2c90e5d6 | 1130 | WARN_ON(1); |
5f39d397 | 1131 | level = btrfs_header_level(b); |
eb60ceac | 1132 | p->nodes[level] = b; |
123abc88 | 1133 | ret = check_block(root, p, level); |
aa5d6bed CM |
1134 | if (ret) |
1135 | return -1; | |
5f39d397 CM |
1136 | ret = bin_search(b, key, level, &slot); |
1137 | if (level != 0) { | |
be0e5c09 CM |
1138 | if (ret && slot > 0) |
1139 | slot -= 1; | |
1140 | p->slots[level] = slot; | |
5f39d397 | 1141 | if (ins_len > 0 && btrfs_header_nritems(b) >= |
d4dbff95 | 1142 | BTRFS_NODEPTRS_PER_BLOCK(root) - 1) { |
e089f05c | 1143 | int sret = split_node(trans, root, p, level); |
5c680ed6 CM |
1144 | BUG_ON(sret > 0); |
1145 | if (sret) | |
1146 | return sret; | |
1147 | b = p->nodes[level]; | |
5c680ed6 | 1148 | slot = p->slots[level]; |
bb803951 | 1149 | } else if (ins_len < 0) { |
e089f05c CM |
1150 | int sret = balance_level(trans, root, p, |
1151 | level); | |
bb803951 CM |
1152 | if (sret) |
1153 | return sret; | |
1154 | b = p->nodes[level]; | |
f510cfec CM |
1155 | if (!b) { |
1156 | btrfs_release_path(NULL, p); | |
bb803951 | 1157 | goto again; |
f510cfec | 1158 | } |
bb803951 | 1159 | slot = p->slots[level]; |
5f39d397 | 1160 | BUG_ON(btrfs_header_nritems(b) == 1); |
5c680ed6 | 1161 | } |
9f3a7427 CM |
1162 | /* this is only true while dropping a snapshot */ |
1163 | if (level == lowest_level) | |
1164 | break; | |
db94535d | 1165 | bytenr = btrfs_node_blockptr(b, slot); |
74493f7a | 1166 | ptr_gen = btrfs_node_ptr_generation(b, slot); |
6702ed49 | 1167 | if (should_reada) |
01f46658 CM |
1168 | reada_for_search(root, p, level, slot, |
1169 | key->objectid); | |
db94535d CM |
1170 | b = read_tree_block(root, bytenr, |
1171 | btrfs_level_size(root, level - 1)); | |
74493f7a CM |
1172 | if (ptr_gen != btrfs_header_generation(b)) { |
1173 | printk("block %llu bad gen wanted %llu " | |
1174 | "found %llu\n", | |
1175 | (unsigned long long)b->start, | |
1176 | (unsigned long long)ptr_gen, | |
1177 | (unsigned long long)btrfs_header_generation(b)); | |
1178 | } | |
be0e5c09 CM |
1179 | } else { |
1180 | p->slots[level] = slot; | |
5f39d397 | 1181 | if (ins_len > 0 && btrfs_leaf_free_space(root, b) < |
0783fcfc | 1182 | sizeof(struct btrfs_item) + ins_len) { |
d4dbff95 | 1183 | int sret = split_leaf(trans, root, key, |
cc0c5538 | 1184 | p, ins_len, ret == 0); |
5c680ed6 CM |
1185 | BUG_ON(sret > 0); |
1186 | if (sret) | |
1187 | return sret; | |
1188 | } | |
be0e5c09 CM |
1189 | return ret; |
1190 | } | |
1191 | } | |
aa5d6bed | 1192 | return 1; |
be0e5c09 CM |
1193 | } |
1194 | ||
74123bd7 CM |
1195 | /* |
1196 | * adjust the pointers going up the tree, starting at level | |
1197 | * making sure the right key of each node is points to 'key'. | |
1198 | * This is used after shifting pointers to the left, so it stops | |
1199 | * fixing up pointers when a given leaf/node is not in slot 0 of the | |
1200 | * higher levels | |
aa5d6bed CM |
1201 | * |
1202 | * If this fails to write a tree block, it returns -1, but continues | |
1203 | * fixing up the blocks in ram so the tree is consistent. | |
74123bd7 | 1204 | */ |
5f39d397 CM |
1205 | static int fixup_low_keys(struct btrfs_trans_handle *trans, |
1206 | struct btrfs_root *root, struct btrfs_path *path, | |
1207 | struct btrfs_disk_key *key, int level) | |
be0e5c09 CM |
1208 | { |
1209 | int i; | |
aa5d6bed | 1210 | int ret = 0; |
5f39d397 CM |
1211 | struct extent_buffer *t; |
1212 | ||
234b63a0 | 1213 | for (i = level; i < BTRFS_MAX_LEVEL; i++) { |
be0e5c09 | 1214 | int tslot = path->slots[i]; |
eb60ceac | 1215 | if (!path->nodes[i]) |
be0e5c09 | 1216 | break; |
5f39d397 CM |
1217 | t = path->nodes[i]; |
1218 | btrfs_set_node_key(t, key, tslot); | |
d6025579 | 1219 | btrfs_mark_buffer_dirty(path->nodes[i]); |
be0e5c09 CM |
1220 | if (tslot != 0) |
1221 | break; | |
1222 | } | |
aa5d6bed | 1223 | return ret; |
be0e5c09 CM |
1224 | } |
1225 | ||
74123bd7 CM |
1226 | /* |
1227 | * try to push data from one node into the next node left in the | |
79f95c82 | 1228 | * tree. |
aa5d6bed CM |
1229 | * |
1230 | * returns 0 if some ptrs were pushed left, < 0 if there was some horrible | |
1231 | * error, and > 0 if there was no room in the left hand block. | |
74123bd7 | 1232 | */ |
98ed5174 CM |
1233 | static int push_node_left(struct btrfs_trans_handle *trans, |
1234 | struct btrfs_root *root, struct extent_buffer *dst, | |
5f39d397 | 1235 | struct extent_buffer *src) |
be0e5c09 | 1236 | { |
be0e5c09 | 1237 | int push_items = 0; |
bb803951 CM |
1238 | int src_nritems; |
1239 | int dst_nritems; | |
aa5d6bed | 1240 | int ret = 0; |
be0e5c09 | 1241 | |
5f39d397 CM |
1242 | src_nritems = btrfs_header_nritems(src); |
1243 | dst_nritems = btrfs_header_nritems(dst); | |
123abc88 | 1244 | push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems; |
7bb86316 CM |
1245 | WARN_ON(btrfs_header_generation(src) != trans->transid); |
1246 | WARN_ON(btrfs_header_generation(dst) != trans->transid); | |
54aa1f4d | 1247 | |
eb60ceac | 1248 | if (push_items <= 0) { |
be0e5c09 | 1249 | return 1; |
eb60ceac | 1250 | } |
be0e5c09 | 1251 | |
bb803951 | 1252 | if (src_nritems < push_items) |
79f95c82 CM |
1253 | push_items = src_nritems; |
1254 | ||
5f39d397 CM |
1255 | copy_extent_buffer(dst, src, |
1256 | btrfs_node_key_ptr_offset(dst_nritems), | |
1257 | btrfs_node_key_ptr_offset(0), | |
1258 | push_items * sizeof(struct btrfs_key_ptr)); | |
1259 | ||
bb803951 | 1260 | if (push_items < src_nritems) { |
5f39d397 CM |
1261 | memmove_extent_buffer(src, btrfs_node_key_ptr_offset(0), |
1262 | btrfs_node_key_ptr_offset(push_items), | |
1263 | (src_nritems - push_items) * | |
1264 | sizeof(struct btrfs_key_ptr)); | |
1265 | } | |
1266 | btrfs_set_header_nritems(src, src_nritems - push_items); | |
1267 | btrfs_set_header_nritems(dst, dst_nritems + push_items); | |
1268 | btrfs_mark_buffer_dirty(src); | |
1269 | btrfs_mark_buffer_dirty(dst); | |
79f95c82 CM |
1270 | return ret; |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * try to push data from one node into the next node right in the | |
1275 | * tree. | |
1276 | * | |
1277 | * returns 0 if some ptrs were pushed, < 0 if there was some horrible | |
1278 | * error, and > 0 if there was no room in the right hand block. | |
1279 | * | |
1280 | * this will only push up to 1/2 the contents of the left node over | |
1281 | */ | |
5f39d397 CM |
1282 | static int balance_node_right(struct btrfs_trans_handle *trans, |
1283 | struct btrfs_root *root, | |
1284 | struct extent_buffer *dst, | |
1285 | struct extent_buffer *src) | |
79f95c82 | 1286 | { |
79f95c82 CM |
1287 | int push_items = 0; |
1288 | int max_push; | |
1289 | int src_nritems; | |
1290 | int dst_nritems; | |
1291 | int ret = 0; | |
79f95c82 | 1292 | |
7bb86316 CM |
1293 | WARN_ON(btrfs_header_generation(src) != trans->transid); |
1294 | WARN_ON(btrfs_header_generation(dst) != trans->transid); | |
1295 | ||
5f39d397 CM |
1296 | src_nritems = btrfs_header_nritems(src); |
1297 | dst_nritems = btrfs_header_nritems(dst); | |
123abc88 | 1298 | push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems; |
5f39d397 | 1299 | if (push_items <= 0) |
79f95c82 | 1300 | return 1; |
79f95c82 CM |
1301 | |
1302 | max_push = src_nritems / 2 + 1; | |
1303 | /* don't try to empty the node */ | |
252c38f0 | 1304 | if (max_push >= src_nritems) |
79f95c82 | 1305 | return 1; |
252c38f0 | 1306 | |
79f95c82 CM |
1307 | if (max_push < push_items) |
1308 | push_items = max_push; | |
1309 | ||
5f39d397 CM |
1310 | memmove_extent_buffer(dst, btrfs_node_key_ptr_offset(push_items), |
1311 | btrfs_node_key_ptr_offset(0), | |
1312 | (dst_nritems) * | |
1313 | sizeof(struct btrfs_key_ptr)); | |
d6025579 | 1314 | |
5f39d397 CM |
1315 | copy_extent_buffer(dst, src, |
1316 | btrfs_node_key_ptr_offset(0), | |
1317 | btrfs_node_key_ptr_offset(src_nritems - push_items), | |
1318 | push_items * sizeof(struct btrfs_key_ptr)); | |
79f95c82 | 1319 | |
5f39d397 CM |
1320 | btrfs_set_header_nritems(src, src_nritems - push_items); |
1321 | btrfs_set_header_nritems(dst, dst_nritems + push_items); | |
79f95c82 | 1322 | |
5f39d397 CM |
1323 | btrfs_mark_buffer_dirty(src); |
1324 | btrfs_mark_buffer_dirty(dst); | |
aa5d6bed | 1325 | return ret; |
be0e5c09 CM |
1326 | } |
1327 | ||
97571fd0 CM |
1328 | /* |
1329 | * helper function to insert a new root level in the tree. | |
1330 | * A new node is allocated, and a single item is inserted to | |
1331 | * point to the existing root | |
aa5d6bed CM |
1332 | * |
1333 | * returns zero on success or < 0 on failure. | |
97571fd0 | 1334 | */ |
98ed5174 | 1335 | static int noinline insert_new_root(struct btrfs_trans_handle *trans, |
5f39d397 CM |
1336 | struct btrfs_root *root, |
1337 | struct btrfs_path *path, int level) | |
5c680ed6 | 1338 | { |
7bb86316 CM |
1339 | u64 root_gen; |
1340 | u64 lower_gen; | |
5f39d397 CM |
1341 | struct extent_buffer *lower; |
1342 | struct extent_buffer *c; | |
1343 | struct btrfs_disk_key lower_key; | |
5c680ed6 CM |
1344 | |
1345 | BUG_ON(path->nodes[level]); | |
1346 | BUG_ON(path->nodes[level-1] != root->node); | |
1347 | ||
7bb86316 CM |
1348 | if (root->ref_cows) |
1349 | root_gen = trans->transid; | |
1350 | else | |
1351 | root_gen = 0; | |
1352 | ||
1353 | lower = path->nodes[level-1]; | |
1354 | if (level == 1) | |
1355 | btrfs_item_key(lower, &lower_key, 0); | |
1356 | else | |
1357 | btrfs_node_key(lower, &lower_key, 0); | |
1358 | ||
1359 | c = __btrfs_alloc_free_block(trans, root, root->nodesize, | |
1360 | root->root_key.objectid, | |
1361 | root_gen, lower_key.objectid, level, | |
db94535d | 1362 | root->node->start, 0); |
5f39d397 CM |
1363 | if (IS_ERR(c)) |
1364 | return PTR_ERR(c); | |
1365 | memset_extent_buffer(c, 0, 0, root->nodesize); | |
1366 | btrfs_set_header_nritems(c, 1); | |
1367 | btrfs_set_header_level(c, level); | |
db94535d | 1368 | btrfs_set_header_bytenr(c, c->start); |
5f39d397 CM |
1369 | btrfs_set_header_generation(c, trans->transid); |
1370 | btrfs_set_header_owner(c, root->root_key.objectid); | |
5f39d397 CM |
1371 | |
1372 | write_extent_buffer(c, root->fs_info->fsid, | |
1373 | (unsigned long)btrfs_header_fsid(c), | |
1374 | BTRFS_FSID_SIZE); | |
5f39d397 | 1375 | btrfs_set_node_key(c, &lower_key, 0); |
db94535d | 1376 | btrfs_set_node_blockptr(c, 0, lower->start); |
7bb86316 CM |
1377 | lower_gen = btrfs_header_generation(lower); |
1378 | WARN_ON(lower_gen == 0); | |
1379 | ||
1380 | btrfs_set_node_ptr_generation(c, 0, lower_gen); | |
d5719762 | 1381 | |
5f39d397 | 1382 | btrfs_mark_buffer_dirty(c); |
d5719762 | 1383 | |
5c680ed6 | 1384 | /* the super has an extra ref to root->node */ |
5f39d397 CM |
1385 | free_extent_buffer(root->node); |
1386 | root->node = c; | |
0b86a832 | 1387 | add_root_to_dirty_list(root); |
5f39d397 CM |
1388 | extent_buffer_get(c); |
1389 | path->nodes[level] = c; | |
5c680ed6 | 1390 | path->slots[level] = 0; |
7bb86316 CM |
1391 | |
1392 | if (root->ref_cows && lower_gen != trans->transid) { | |
1393 | struct btrfs_path *back_path = btrfs_alloc_path(); | |
1394 | int ret; | |
1395 | ret = btrfs_insert_extent_backref(trans, | |
1396 | root->fs_info->extent_root, | |
1397 | path, lower->start, | |
1398 | root->root_key.objectid, | |
1399 | trans->transid, 0, 0); | |
1400 | BUG_ON(ret); | |
1401 | btrfs_free_path(back_path); | |
1402 | } | |
5c680ed6 CM |
1403 | return 0; |
1404 | } | |
1405 | ||
74123bd7 CM |
1406 | /* |
1407 | * worker function to insert a single pointer in a node. | |
1408 | * the node should have enough room for the pointer already | |
97571fd0 | 1409 | * |
74123bd7 CM |
1410 | * slot and level indicate where you want the key to go, and |
1411 | * blocknr is the block the key points to. | |
aa5d6bed CM |
1412 | * |
1413 | * returns zero on success and < 0 on any error | |
74123bd7 | 1414 | */ |
e089f05c CM |
1415 | static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root |
1416 | *root, struct btrfs_path *path, struct btrfs_disk_key | |
db94535d | 1417 | *key, u64 bytenr, int slot, int level) |
74123bd7 | 1418 | { |
5f39d397 | 1419 | struct extent_buffer *lower; |
74123bd7 | 1420 | int nritems; |
5c680ed6 CM |
1421 | |
1422 | BUG_ON(!path->nodes[level]); | |
5f39d397 CM |
1423 | lower = path->nodes[level]; |
1424 | nritems = btrfs_header_nritems(lower); | |
74123bd7 CM |
1425 | if (slot > nritems) |
1426 | BUG(); | |
123abc88 | 1427 | if (nritems == BTRFS_NODEPTRS_PER_BLOCK(root)) |
74123bd7 CM |
1428 | BUG(); |
1429 | if (slot != nritems) { | |
5f39d397 CM |
1430 | memmove_extent_buffer(lower, |
1431 | btrfs_node_key_ptr_offset(slot + 1), | |
1432 | btrfs_node_key_ptr_offset(slot), | |
d6025579 | 1433 | (nritems - slot) * sizeof(struct btrfs_key_ptr)); |
74123bd7 | 1434 | } |
5f39d397 | 1435 | btrfs_set_node_key(lower, key, slot); |
db94535d | 1436 | btrfs_set_node_blockptr(lower, slot, bytenr); |
74493f7a CM |
1437 | WARN_ON(trans->transid == 0); |
1438 | btrfs_set_node_ptr_generation(lower, slot, trans->transid); | |
5f39d397 CM |
1439 | btrfs_set_header_nritems(lower, nritems + 1); |
1440 | btrfs_mark_buffer_dirty(lower); | |
74123bd7 CM |
1441 | return 0; |
1442 | } | |
1443 | ||
97571fd0 CM |
1444 | /* |
1445 | * split the node at the specified level in path in two. | |
1446 | * The path is corrected to point to the appropriate node after the split | |
1447 | * | |
1448 | * Before splitting this tries to make some room in the node by pushing | |
1449 | * left and right, if either one works, it returns right away. | |
aa5d6bed CM |
1450 | * |
1451 | * returns 0 on success and < 0 on failure | |
97571fd0 | 1452 | */ |
e089f05c CM |
1453 | static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root |
1454 | *root, struct btrfs_path *path, int level) | |
be0e5c09 | 1455 | { |
7bb86316 | 1456 | u64 root_gen; |
5f39d397 CM |
1457 | struct extent_buffer *c; |
1458 | struct extent_buffer *split; | |
1459 | struct btrfs_disk_key disk_key; | |
be0e5c09 | 1460 | int mid; |
5c680ed6 | 1461 | int ret; |
aa5d6bed | 1462 | int wret; |
7518a238 | 1463 | u32 c_nritems; |
eb60ceac | 1464 | |
5f39d397 | 1465 | c = path->nodes[level]; |
7bb86316 | 1466 | WARN_ON(btrfs_header_generation(c) != trans->transid); |
5f39d397 | 1467 | if (c == root->node) { |
5c680ed6 | 1468 | /* trying to split the root, lets make a new one */ |
e089f05c | 1469 | ret = insert_new_root(trans, root, path, level + 1); |
5c680ed6 CM |
1470 | if (ret) |
1471 | return ret; | |
e66f709b CM |
1472 | } else { |
1473 | ret = push_nodes_for_insert(trans, root, path, level); | |
5f39d397 CM |
1474 | c = path->nodes[level]; |
1475 | if (!ret && btrfs_header_nritems(c) < | |
e66f709b CM |
1476 | BTRFS_NODEPTRS_PER_BLOCK(root) - 1) |
1477 | return 0; | |
54aa1f4d CM |
1478 | if (ret < 0) |
1479 | return ret; | |
be0e5c09 | 1480 | } |
e66f709b | 1481 | |
5f39d397 | 1482 | c_nritems = btrfs_header_nritems(c); |
7bb86316 CM |
1483 | if (root->ref_cows) |
1484 | root_gen = trans->transid; | |
1485 | else | |
1486 | root_gen = 0; | |
1487 | ||
1488 | btrfs_node_key(c, &disk_key, 0); | |
1489 | split = __btrfs_alloc_free_block(trans, root, root->nodesize, | |
1490 | root->root_key.objectid, | |
1491 | root_gen, | |
1492 | btrfs_disk_key_objectid(&disk_key), | |
1493 | level, c->start, 0); | |
5f39d397 CM |
1494 | if (IS_ERR(split)) |
1495 | return PTR_ERR(split); | |
1496 | ||
1497 | btrfs_set_header_flags(split, btrfs_header_flags(c)); | |
1498 | btrfs_set_header_level(split, btrfs_header_level(c)); | |
db94535d | 1499 | btrfs_set_header_bytenr(split, split->start); |
5f39d397 CM |
1500 | btrfs_set_header_generation(split, trans->transid); |
1501 | btrfs_set_header_owner(split, root->root_key.objectid); | |
63b10fc4 | 1502 | btrfs_set_header_flags(split, 0); |
5f39d397 CM |
1503 | write_extent_buffer(split, root->fs_info->fsid, |
1504 | (unsigned long)btrfs_header_fsid(split), | |
1505 | BTRFS_FSID_SIZE); | |
54aa1f4d | 1506 | |
7518a238 | 1507 | mid = (c_nritems + 1) / 2; |
5f39d397 CM |
1508 | |
1509 | copy_extent_buffer(split, c, | |
1510 | btrfs_node_key_ptr_offset(0), | |
1511 | btrfs_node_key_ptr_offset(mid), | |
1512 | (c_nritems - mid) * sizeof(struct btrfs_key_ptr)); | |
1513 | btrfs_set_header_nritems(split, c_nritems - mid); | |
1514 | btrfs_set_header_nritems(c, mid); | |
aa5d6bed CM |
1515 | ret = 0; |
1516 | ||
5f39d397 CM |
1517 | btrfs_mark_buffer_dirty(c); |
1518 | btrfs_mark_buffer_dirty(split); | |
1519 | ||
1520 | btrfs_node_key(split, &disk_key, 0); | |
db94535d | 1521 | wret = insert_ptr(trans, root, path, &disk_key, split->start, |
5f39d397 | 1522 | path->slots[level + 1] + 1, |
123abc88 | 1523 | level + 1); |
aa5d6bed CM |
1524 | if (wret) |
1525 | ret = wret; | |
1526 | ||
5de08d7d | 1527 | if (path->slots[level] >= mid) { |
5c680ed6 | 1528 | path->slots[level] -= mid; |
5f39d397 CM |
1529 | free_extent_buffer(c); |
1530 | path->nodes[level] = split; | |
5c680ed6 CM |
1531 | path->slots[level + 1] += 1; |
1532 | } else { | |
5f39d397 | 1533 | free_extent_buffer(split); |
be0e5c09 | 1534 | } |
aa5d6bed | 1535 | return ret; |
be0e5c09 CM |
1536 | } |
1537 | ||
74123bd7 CM |
1538 | /* |
1539 | * how many bytes are required to store the items in a leaf. start | |
1540 | * and nr indicate which items in the leaf to check. This totals up the | |
1541 | * space used both by the item structs and the item data | |
1542 | */ | |
5f39d397 | 1543 | static int leaf_space_used(struct extent_buffer *l, int start, int nr) |
be0e5c09 CM |
1544 | { |
1545 | int data_len; | |
5f39d397 | 1546 | int nritems = btrfs_header_nritems(l); |
d4dbff95 | 1547 | int end = min(nritems, start + nr) - 1; |
be0e5c09 CM |
1548 | |
1549 | if (!nr) | |
1550 | return 0; | |
5f39d397 CM |
1551 | data_len = btrfs_item_end_nr(l, start); |
1552 | data_len = data_len - btrfs_item_offset_nr(l, end); | |
0783fcfc | 1553 | data_len += sizeof(struct btrfs_item) * nr; |
d4dbff95 | 1554 | WARN_ON(data_len < 0); |
be0e5c09 CM |
1555 | return data_len; |
1556 | } | |
1557 | ||
d4dbff95 CM |
1558 | /* |
1559 | * The space between the end of the leaf items and | |
1560 | * the start of the leaf data. IOW, how much room | |
1561 | * the leaf has left for both items and data | |
1562 | */ | |
5f39d397 | 1563 | int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf) |
d4dbff95 | 1564 | { |
5f39d397 CM |
1565 | int nritems = btrfs_header_nritems(leaf); |
1566 | int ret; | |
1567 | ret = BTRFS_LEAF_DATA_SIZE(root) - leaf_space_used(leaf, 0, nritems); | |
1568 | if (ret < 0) { | |
1569 | printk("leaf free space ret %d, leaf data size %lu, used %d nritems %d\n", | |
ae2f5411 | 1570 | ret, (unsigned long) BTRFS_LEAF_DATA_SIZE(root), |
5f39d397 CM |
1571 | leaf_space_used(leaf, 0, nritems), nritems); |
1572 | } | |
1573 | return ret; | |
d4dbff95 CM |
1574 | } |
1575 | ||
00ec4c51 CM |
1576 | /* |
1577 | * push some data in the path leaf to the right, trying to free up at | |
1578 | * least data_size bytes. returns zero if the push worked, nonzero otherwise | |
aa5d6bed CM |
1579 | * |
1580 | * returns 1 if the push failed because the other node didn't have enough | |
1581 | * room, 0 if everything worked out and < 0 if there were major errors. | |
00ec4c51 | 1582 | */ |
e089f05c | 1583 | static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root |
34a38218 CM |
1584 | *root, struct btrfs_path *path, int data_size, |
1585 | int empty) | |
00ec4c51 | 1586 | { |
5f39d397 CM |
1587 | struct extent_buffer *left = path->nodes[0]; |
1588 | struct extent_buffer *right; | |
1589 | struct extent_buffer *upper; | |
1590 | struct btrfs_disk_key disk_key; | |
00ec4c51 | 1591 | int slot; |
34a38218 | 1592 | u32 i; |
00ec4c51 CM |
1593 | int free_space; |
1594 | int push_space = 0; | |
1595 | int push_items = 0; | |
0783fcfc | 1596 | struct btrfs_item *item; |
7518a238 | 1597 | u32 left_nritems; |
34a38218 | 1598 | u32 nr; |
7518a238 | 1599 | u32 right_nritems; |
5f39d397 | 1600 | u32 data_end; |
db94535d | 1601 | u32 this_item_size; |
54aa1f4d | 1602 | int ret; |
00ec4c51 CM |
1603 | |
1604 | slot = path->slots[1]; | |
1605 | if (!path->nodes[1]) { | |
1606 | return 1; | |
1607 | } | |
1608 | upper = path->nodes[1]; | |
5f39d397 | 1609 | if (slot >= btrfs_header_nritems(upper) - 1) |
00ec4c51 | 1610 | return 1; |
5f39d397 | 1611 | |
db94535d CM |
1612 | right = read_tree_block(root, btrfs_node_blockptr(upper, slot + 1), |
1613 | root->leafsize); | |
123abc88 | 1614 | free_space = btrfs_leaf_free_space(root, right); |
0783fcfc | 1615 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
5f39d397 | 1616 | free_extent_buffer(right); |
00ec4c51 CM |
1617 | return 1; |
1618 | } | |
5f39d397 | 1619 | |
02217ed2 | 1620 | /* cow and double check */ |
5f39d397 CM |
1621 | ret = btrfs_cow_block(trans, root, right, upper, |
1622 | slot + 1, &right); | |
54aa1f4d | 1623 | if (ret) { |
5f39d397 | 1624 | free_extent_buffer(right); |
54aa1f4d CM |
1625 | return 1; |
1626 | } | |
123abc88 | 1627 | free_space = btrfs_leaf_free_space(root, right); |
0783fcfc | 1628 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
5f39d397 | 1629 | free_extent_buffer(right); |
02217ed2 CM |
1630 | return 1; |
1631 | } | |
1632 | ||
5f39d397 | 1633 | left_nritems = btrfs_header_nritems(left); |
a429e513 | 1634 | if (left_nritems == 0) { |
5f39d397 | 1635 | free_extent_buffer(right); |
a429e513 CM |
1636 | return 1; |
1637 | } | |
5f39d397 | 1638 | |
34a38218 CM |
1639 | if (empty) |
1640 | nr = 0; | |
1641 | else | |
1642 | nr = 1; | |
1643 | ||
1644 | i = left_nritems - 1; | |
1645 | while (i >= nr) { | |
5f39d397 | 1646 | item = btrfs_item_nr(left, i); |
db94535d | 1647 | |
00ec4c51 CM |
1648 | if (path->slots[0] == i) |
1649 | push_space += data_size + sizeof(*item); | |
db94535d CM |
1650 | |
1651 | if (!left->map_token) { | |
1652 | map_extent_buffer(left, (unsigned long)item, | |
1653 | sizeof(struct btrfs_item), | |
1654 | &left->map_token, &left->kaddr, | |
1655 | &left->map_start, &left->map_len, | |
1656 | KM_USER1); | |
1657 | } | |
1658 | ||
1659 | this_item_size = btrfs_item_size(left, item); | |
1660 | if (this_item_size + sizeof(*item) + push_space > free_space) | |
00ec4c51 CM |
1661 | break; |
1662 | push_items++; | |
db94535d | 1663 | push_space += this_item_size + sizeof(*item); |
34a38218 CM |
1664 | if (i == 0) |
1665 | break; | |
1666 | i--; | |
db94535d CM |
1667 | } |
1668 | if (left->map_token) { | |
1669 | unmap_extent_buffer(left, left->map_token, KM_USER1); | |
1670 | left->map_token = NULL; | |
00ec4c51 | 1671 | } |
5f39d397 | 1672 | |
00ec4c51 | 1673 | if (push_items == 0) { |
5f39d397 | 1674 | free_extent_buffer(right); |
00ec4c51 CM |
1675 | return 1; |
1676 | } | |
5f39d397 | 1677 | |
34a38218 | 1678 | if (!empty && push_items == left_nritems) |
a429e513 | 1679 | WARN_ON(1); |
5f39d397 | 1680 | |
00ec4c51 | 1681 | /* push left to right */ |
5f39d397 | 1682 | right_nritems = btrfs_header_nritems(right); |
34a38218 | 1683 | |
5f39d397 | 1684 | push_space = btrfs_item_end_nr(left, left_nritems - push_items); |
123abc88 | 1685 | push_space -= leaf_data_end(root, left); |
5f39d397 | 1686 | |
00ec4c51 | 1687 | /* make room in the right data area */ |
5f39d397 CM |
1688 | data_end = leaf_data_end(root, right); |
1689 | memmove_extent_buffer(right, | |
1690 | btrfs_leaf_data(right) + data_end - push_space, | |
1691 | btrfs_leaf_data(right) + data_end, | |
1692 | BTRFS_LEAF_DATA_SIZE(root) - data_end); | |
1693 | ||
00ec4c51 | 1694 | /* copy from the left data area */ |
5f39d397 | 1695 | copy_extent_buffer(right, left, btrfs_leaf_data(right) + |
d6025579 CM |
1696 | BTRFS_LEAF_DATA_SIZE(root) - push_space, |
1697 | btrfs_leaf_data(left) + leaf_data_end(root, left), | |
1698 | push_space); | |
5f39d397 CM |
1699 | |
1700 | memmove_extent_buffer(right, btrfs_item_nr_offset(push_items), | |
1701 | btrfs_item_nr_offset(0), | |
1702 | right_nritems * sizeof(struct btrfs_item)); | |
1703 | ||
00ec4c51 | 1704 | /* copy the items from left to right */ |
5f39d397 CM |
1705 | copy_extent_buffer(right, left, btrfs_item_nr_offset(0), |
1706 | btrfs_item_nr_offset(left_nritems - push_items), | |
1707 | push_items * sizeof(struct btrfs_item)); | |
00ec4c51 CM |
1708 | |
1709 | /* update the item pointers */ | |
7518a238 | 1710 | right_nritems += push_items; |
5f39d397 | 1711 | btrfs_set_header_nritems(right, right_nritems); |
123abc88 | 1712 | push_space = BTRFS_LEAF_DATA_SIZE(root); |
7518a238 | 1713 | for (i = 0; i < right_nritems; i++) { |
5f39d397 | 1714 | item = btrfs_item_nr(right, i); |
db94535d CM |
1715 | if (!right->map_token) { |
1716 | map_extent_buffer(right, (unsigned long)item, | |
1717 | sizeof(struct btrfs_item), | |
1718 | &right->map_token, &right->kaddr, | |
1719 | &right->map_start, &right->map_len, | |
1720 | KM_USER1); | |
1721 | } | |
1722 | push_space -= btrfs_item_size(right, item); | |
1723 | btrfs_set_item_offset(right, item, push_space); | |
1724 | } | |
1725 | ||
1726 | if (right->map_token) { | |
1727 | unmap_extent_buffer(right, right->map_token, KM_USER1); | |
1728 | right->map_token = NULL; | |
00ec4c51 | 1729 | } |
7518a238 | 1730 | left_nritems -= push_items; |
5f39d397 | 1731 | btrfs_set_header_nritems(left, left_nritems); |
00ec4c51 | 1732 | |
34a38218 CM |
1733 | if (left_nritems) |
1734 | btrfs_mark_buffer_dirty(left); | |
5f39d397 | 1735 | btrfs_mark_buffer_dirty(right); |
a429e513 | 1736 | |
5f39d397 CM |
1737 | btrfs_item_key(right, &disk_key, 0); |
1738 | btrfs_set_node_key(upper, &disk_key, slot + 1); | |
d6025579 | 1739 | btrfs_mark_buffer_dirty(upper); |
02217ed2 | 1740 | |
00ec4c51 | 1741 | /* then fixup the leaf pointer in the path */ |
7518a238 CM |
1742 | if (path->slots[0] >= left_nritems) { |
1743 | path->slots[0] -= left_nritems; | |
5f39d397 CM |
1744 | free_extent_buffer(path->nodes[0]); |
1745 | path->nodes[0] = right; | |
00ec4c51 CM |
1746 | path->slots[1] += 1; |
1747 | } else { | |
5f39d397 | 1748 | free_extent_buffer(right); |
00ec4c51 CM |
1749 | } |
1750 | return 0; | |
1751 | } | |
74123bd7 CM |
1752 | /* |
1753 | * push some data in the path leaf to the left, trying to free up at | |
1754 | * least data_size bytes. returns zero if the push worked, nonzero otherwise | |
1755 | */ | |
e089f05c | 1756 | static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root |
34a38218 CM |
1757 | *root, struct btrfs_path *path, int data_size, |
1758 | int empty) | |
be0e5c09 | 1759 | { |
5f39d397 CM |
1760 | struct btrfs_disk_key disk_key; |
1761 | struct extent_buffer *right = path->nodes[0]; | |
1762 | struct extent_buffer *left; | |
be0e5c09 CM |
1763 | int slot; |
1764 | int i; | |
1765 | int free_space; | |
1766 | int push_space = 0; | |
1767 | int push_items = 0; | |
0783fcfc | 1768 | struct btrfs_item *item; |
7518a238 | 1769 | u32 old_left_nritems; |
5f39d397 | 1770 | u32 right_nritems; |
34a38218 | 1771 | u32 nr; |
aa5d6bed CM |
1772 | int ret = 0; |
1773 | int wret; | |
db94535d CM |
1774 | u32 this_item_size; |
1775 | u32 old_left_item_size; | |
be0e5c09 CM |
1776 | |
1777 | slot = path->slots[1]; | |
5f39d397 | 1778 | if (slot == 0) |
be0e5c09 | 1779 | return 1; |
5f39d397 | 1780 | if (!path->nodes[1]) |
be0e5c09 | 1781 | return 1; |
5f39d397 | 1782 | |
3685f791 CM |
1783 | right_nritems = btrfs_header_nritems(right); |
1784 | if (right_nritems == 0) { | |
1785 | return 1; | |
1786 | } | |
1787 | ||
5f39d397 | 1788 | left = read_tree_block(root, btrfs_node_blockptr(path->nodes[1], |
db94535d | 1789 | slot - 1), root->leafsize); |
123abc88 | 1790 | free_space = btrfs_leaf_free_space(root, left); |
0783fcfc | 1791 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
5f39d397 | 1792 | free_extent_buffer(left); |
be0e5c09 CM |
1793 | return 1; |
1794 | } | |
02217ed2 CM |
1795 | |
1796 | /* cow and double check */ | |
5f39d397 CM |
1797 | ret = btrfs_cow_block(trans, root, left, |
1798 | path->nodes[1], slot - 1, &left); | |
54aa1f4d CM |
1799 | if (ret) { |
1800 | /* we hit -ENOSPC, but it isn't fatal here */ | |
5f39d397 | 1801 | free_extent_buffer(left); |
54aa1f4d CM |
1802 | return 1; |
1803 | } | |
3685f791 | 1804 | |
123abc88 | 1805 | free_space = btrfs_leaf_free_space(root, left); |
0783fcfc | 1806 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
5f39d397 | 1807 | free_extent_buffer(left); |
02217ed2 CM |
1808 | return 1; |
1809 | } | |
1810 | ||
34a38218 CM |
1811 | if (empty) |
1812 | nr = right_nritems; | |
1813 | else | |
1814 | nr = right_nritems - 1; | |
1815 | ||
1816 | for (i = 0; i < nr; i++) { | |
5f39d397 | 1817 | item = btrfs_item_nr(right, i); |
db94535d CM |
1818 | if (!right->map_token) { |
1819 | map_extent_buffer(right, (unsigned long)item, | |
1820 | sizeof(struct btrfs_item), | |
1821 | &right->map_token, &right->kaddr, | |
1822 | &right->map_start, &right->map_len, | |
1823 | KM_USER1); | |
1824 | } | |
1825 | ||
be0e5c09 CM |
1826 | if (path->slots[0] == i) |
1827 | push_space += data_size + sizeof(*item); | |
db94535d CM |
1828 | |
1829 | this_item_size = btrfs_item_size(right, item); | |
1830 | if (this_item_size + sizeof(*item) + push_space > free_space) | |
be0e5c09 | 1831 | break; |
db94535d | 1832 | |
be0e5c09 | 1833 | push_items++; |
db94535d CM |
1834 | push_space += this_item_size + sizeof(*item); |
1835 | } | |
1836 | ||
1837 | if (right->map_token) { | |
1838 | unmap_extent_buffer(right, right->map_token, KM_USER1); | |
1839 | right->map_token = NULL; | |
be0e5c09 | 1840 | } |
db94535d | 1841 | |
be0e5c09 | 1842 | if (push_items == 0) { |
5f39d397 | 1843 | free_extent_buffer(left); |
be0e5c09 CM |
1844 | return 1; |
1845 | } | |
34a38218 | 1846 | if (!empty && push_items == btrfs_header_nritems(right)) |
a429e513 | 1847 | WARN_ON(1); |
5f39d397 | 1848 | |
be0e5c09 | 1849 | /* push data from right to left */ |
5f39d397 CM |
1850 | copy_extent_buffer(left, right, |
1851 | btrfs_item_nr_offset(btrfs_header_nritems(left)), | |
1852 | btrfs_item_nr_offset(0), | |
1853 | push_items * sizeof(struct btrfs_item)); | |
1854 | ||
123abc88 | 1855 | push_space = BTRFS_LEAF_DATA_SIZE(root) - |
5f39d397 CM |
1856 | btrfs_item_offset_nr(right, push_items -1); |
1857 | ||
1858 | copy_extent_buffer(left, right, btrfs_leaf_data(left) + | |
d6025579 CM |
1859 | leaf_data_end(root, left) - push_space, |
1860 | btrfs_leaf_data(right) + | |
5f39d397 | 1861 | btrfs_item_offset_nr(right, push_items - 1), |
d6025579 | 1862 | push_space); |
5f39d397 | 1863 | old_left_nritems = btrfs_header_nritems(left); |
eb60ceac CM |
1864 | BUG_ON(old_left_nritems < 0); |
1865 | ||
db94535d | 1866 | old_left_item_size = btrfs_item_offset_nr(left, old_left_nritems - 1); |
0783fcfc | 1867 | for (i = old_left_nritems; i < old_left_nritems + push_items; i++) { |
5f39d397 | 1868 | u32 ioff; |
db94535d | 1869 | |
5f39d397 | 1870 | item = btrfs_item_nr(left, i); |
db94535d CM |
1871 | if (!left->map_token) { |
1872 | map_extent_buffer(left, (unsigned long)item, | |
1873 | sizeof(struct btrfs_item), | |
1874 | &left->map_token, &left->kaddr, | |
1875 | &left->map_start, &left->map_len, | |
1876 | KM_USER1); | |
1877 | } | |
1878 | ||
5f39d397 CM |
1879 | ioff = btrfs_item_offset(left, item); |
1880 | btrfs_set_item_offset(left, item, | |
db94535d | 1881 | ioff - (BTRFS_LEAF_DATA_SIZE(root) - old_left_item_size)); |
be0e5c09 | 1882 | } |
5f39d397 | 1883 | btrfs_set_header_nritems(left, old_left_nritems + push_items); |
db94535d CM |
1884 | if (left->map_token) { |
1885 | unmap_extent_buffer(left, left->map_token, KM_USER1); | |
1886 | left->map_token = NULL; | |
1887 | } | |
be0e5c09 CM |
1888 | |
1889 | /* fixup right node */ | |
34a38218 CM |
1890 | if (push_items > right_nritems) { |
1891 | printk("push items %d nr %u\n", push_items, right_nritems); | |
1892 | WARN_ON(1); | |
1893 | } | |
1894 | ||
1895 | if (push_items < right_nritems) { | |
1896 | push_space = btrfs_item_offset_nr(right, push_items - 1) - | |
1897 | leaf_data_end(root, right); | |
1898 | memmove_extent_buffer(right, btrfs_leaf_data(right) + | |
1899 | BTRFS_LEAF_DATA_SIZE(root) - push_space, | |
1900 | btrfs_leaf_data(right) + | |
1901 | leaf_data_end(root, right), push_space); | |
1902 | ||
1903 | memmove_extent_buffer(right, btrfs_item_nr_offset(0), | |
5f39d397 CM |
1904 | btrfs_item_nr_offset(push_items), |
1905 | (btrfs_header_nritems(right) - push_items) * | |
1906 | sizeof(struct btrfs_item)); | |
34a38218 | 1907 | } |
eef1c494 Y |
1908 | right_nritems -= push_items; |
1909 | btrfs_set_header_nritems(right, right_nritems); | |
123abc88 | 1910 | push_space = BTRFS_LEAF_DATA_SIZE(root); |
5f39d397 CM |
1911 | for (i = 0; i < right_nritems; i++) { |
1912 | item = btrfs_item_nr(right, i); | |
db94535d CM |
1913 | |
1914 | if (!right->map_token) { | |
1915 | map_extent_buffer(right, (unsigned long)item, | |
1916 | sizeof(struct btrfs_item), | |
1917 | &right->map_token, &right->kaddr, | |
1918 | &right->map_start, &right->map_len, | |
1919 | KM_USER1); | |
1920 | } | |
1921 | ||
1922 | push_space = push_space - btrfs_item_size(right, item); | |
1923 | btrfs_set_item_offset(right, item, push_space); | |
1924 | } | |
1925 | if (right->map_token) { | |
1926 | unmap_extent_buffer(right, right->map_token, KM_USER1); | |
1927 | right->map_token = NULL; | |
be0e5c09 | 1928 | } |
eb60ceac | 1929 | |
5f39d397 | 1930 | btrfs_mark_buffer_dirty(left); |
34a38218 CM |
1931 | if (right_nritems) |
1932 | btrfs_mark_buffer_dirty(right); | |
098f59c2 | 1933 | |
5f39d397 CM |
1934 | btrfs_item_key(right, &disk_key, 0); |
1935 | wret = fixup_low_keys(trans, root, path, &disk_key, 1); | |
aa5d6bed CM |
1936 | if (wret) |
1937 | ret = wret; | |
be0e5c09 CM |
1938 | |
1939 | /* then fixup the leaf pointer in the path */ | |
1940 | if (path->slots[0] < push_items) { | |
1941 | path->slots[0] += old_left_nritems; | |
5f39d397 CM |
1942 | free_extent_buffer(path->nodes[0]); |
1943 | path->nodes[0] = left; | |
be0e5c09 CM |
1944 | path->slots[1] -= 1; |
1945 | } else { | |
5f39d397 | 1946 | free_extent_buffer(left); |
be0e5c09 CM |
1947 | path->slots[0] -= push_items; |
1948 | } | |
eb60ceac | 1949 | BUG_ON(path->slots[0] < 0); |
aa5d6bed | 1950 | return ret; |
be0e5c09 CM |
1951 | } |
1952 | ||
74123bd7 CM |
1953 | /* |
1954 | * split the path's leaf in two, making sure there is at least data_size | |
1955 | * available for the resulting leaf level of the path. | |
aa5d6bed CM |
1956 | * |
1957 | * returns 0 if all went well and < 0 on failure. | |
74123bd7 | 1958 | */ |
e089f05c | 1959 | static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root |
d4dbff95 | 1960 | *root, struct btrfs_key *ins_key, |
cc0c5538 | 1961 | struct btrfs_path *path, int data_size, int extend) |
be0e5c09 | 1962 | { |
7bb86316 | 1963 | u64 root_gen; |
5f39d397 | 1964 | struct extent_buffer *l; |
7518a238 | 1965 | u32 nritems; |
eb60ceac CM |
1966 | int mid; |
1967 | int slot; | |
5f39d397 | 1968 | struct extent_buffer *right; |
0783fcfc | 1969 | int space_needed = data_size + sizeof(struct btrfs_item); |
be0e5c09 CM |
1970 | int data_copy_size; |
1971 | int rt_data_off; | |
1972 | int i; | |
d4dbff95 | 1973 | int ret = 0; |
aa5d6bed | 1974 | int wret; |
cc0c5538 CM |
1975 | int double_split; |
1976 | int num_doubles = 0; | |
d4dbff95 | 1977 | struct btrfs_disk_key disk_key; |
aa5d6bed | 1978 | |
cc0c5538 CM |
1979 | if (extend) |
1980 | space_needed = data_size; | |
1981 | ||
7bb86316 CM |
1982 | if (root->ref_cows) |
1983 | root_gen = trans->transid; | |
1984 | else | |
1985 | root_gen = 0; | |
1986 | ||
40689478 | 1987 | /* first try to make some room by pushing left and right */ |
3685f791 | 1988 | if (ins_key->type != BTRFS_DIR_ITEM_KEY) { |
34a38218 | 1989 | wret = push_leaf_right(trans, root, path, data_size, 0); |
3685f791 | 1990 | if (wret < 0) { |
eaee50e8 | 1991 | return wret; |
3685f791 CM |
1992 | } |
1993 | if (wret) { | |
34a38218 | 1994 | wret = push_leaf_left(trans, root, path, data_size, 0); |
3685f791 CM |
1995 | if (wret < 0) |
1996 | return wret; | |
1997 | } | |
1998 | l = path->nodes[0]; | |
aa5d6bed | 1999 | |
3685f791 | 2000 | /* did the pushes work? */ |
cc0c5538 | 2001 | if (btrfs_leaf_free_space(root, l) >= space_needed) |
3685f791 | 2002 | return 0; |
3326d1b0 | 2003 | } |
aa5d6bed | 2004 | |
5c680ed6 | 2005 | if (!path->nodes[1]) { |
e089f05c | 2006 | ret = insert_new_root(trans, root, path, 1); |
5c680ed6 CM |
2007 | if (ret) |
2008 | return ret; | |
2009 | } | |
cc0c5538 CM |
2010 | again: |
2011 | double_split = 0; | |
2012 | l = path->nodes[0]; | |
eb60ceac | 2013 | slot = path->slots[0]; |
5f39d397 | 2014 | nritems = btrfs_header_nritems(l); |
eb60ceac | 2015 | mid = (nritems + 1)/ 2; |
54aa1f4d | 2016 | |
7bb86316 CM |
2017 | btrfs_item_key(l, &disk_key, 0); |
2018 | ||
2019 | right = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2020 | root->root_key.objectid, | |
2021 | root_gen, disk_key.objectid, 0, | |
2022 | l->start, 0); | |
cea9e445 CM |
2023 | if (IS_ERR(right)) { |
2024 | BUG_ON(1); | |
5f39d397 | 2025 | return PTR_ERR(right); |
cea9e445 | 2026 | } |
5f39d397 CM |
2027 | |
2028 | memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header)); | |
db94535d | 2029 | btrfs_set_header_bytenr(right, right->start); |
5f39d397 CM |
2030 | btrfs_set_header_generation(right, trans->transid); |
2031 | btrfs_set_header_owner(right, root->root_key.objectid); | |
2032 | btrfs_set_header_level(right, 0); | |
2033 | write_extent_buffer(right, root->fs_info->fsid, | |
2034 | (unsigned long)btrfs_header_fsid(right), | |
2035 | BTRFS_FSID_SIZE); | |
d4dbff95 CM |
2036 | if (mid <= slot) { |
2037 | if (nritems == 1 || | |
2038 | leaf_space_used(l, mid, nritems - mid) + space_needed > | |
2039 | BTRFS_LEAF_DATA_SIZE(root)) { | |
2040 | if (slot >= nritems) { | |
2041 | btrfs_cpu_key_to_disk(&disk_key, ins_key); | |
5f39d397 | 2042 | btrfs_set_header_nritems(right, 0); |
d4dbff95 | 2043 | wret = insert_ptr(trans, root, path, |
db94535d | 2044 | &disk_key, right->start, |
d4dbff95 CM |
2045 | path->slots[1] + 1, 1); |
2046 | if (wret) | |
2047 | ret = wret; | |
5f39d397 CM |
2048 | free_extent_buffer(path->nodes[0]); |
2049 | path->nodes[0] = right; | |
d4dbff95 CM |
2050 | path->slots[0] = 0; |
2051 | path->slots[1] += 1; | |
0ef8b242 | 2052 | btrfs_mark_buffer_dirty(right); |
d4dbff95 CM |
2053 | return ret; |
2054 | } | |
2055 | mid = slot; | |
3326d1b0 CM |
2056 | if (mid != nritems && |
2057 | leaf_space_used(l, mid, nritems - mid) + | |
2058 | space_needed > BTRFS_LEAF_DATA_SIZE(root)) { | |
2059 | double_split = 1; | |
2060 | } | |
d4dbff95 CM |
2061 | } |
2062 | } else { | |
2063 | if (leaf_space_used(l, 0, mid + 1) + space_needed > | |
2064 | BTRFS_LEAF_DATA_SIZE(root)) { | |
cc0c5538 | 2065 | if (!extend && slot == 0) { |
d4dbff95 | 2066 | btrfs_cpu_key_to_disk(&disk_key, ins_key); |
5f39d397 | 2067 | btrfs_set_header_nritems(right, 0); |
d4dbff95 CM |
2068 | wret = insert_ptr(trans, root, path, |
2069 | &disk_key, | |
db94535d | 2070 | right->start, |
098f59c2 | 2071 | path->slots[1], 1); |
d4dbff95 CM |
2072 | if (wret) |
2073 | ret = wret; | |
5f39d397 CM |
2074 | free_extent_buffer(path->nodes[0]); |
2075 | path->nodes[0] = right; | |
d4dbff95 | 2076 | path->slots[0] = 0; |
a429e513 CM |
2077 | if (path->slots[1] == 0) { |
2078 | wret = fixup_low_keys(trans, root, | |
2079 | path, &disk_key, 1); | |
2080 | if (wret) | |
2081 | ret = wret; | |
2082 | } | |
0ef8b242 | 2083 | btrfs_mark_buffer_dirty(right); |
d4dbff95 | 2084 | return ret; |
cc0c5538 CM |
2085 | } else if (extend && slot == 0) { |
2086 | mid = 1; | |
2087 | } else { | |
2088 | mid = slot; | |
2089 | if (mid != nritems && | |
2090 | leaf_space_used(l, mid, nritems - mid) + | |
2091 | space_needed > BTRFS_LEAF_DATA_SIZE(root)) { | |
2092 | double_split = 1; | |
2093 | } | |
5ee78ac7 | 2094 | } |
d4dbff95 CM |
2095 | } |
2096 | } | |
5f39d397 CM |
2097 | nritems = nritems - mid; |
2098 | btrfs_set_header_nritems(right, nritems); | |
2099 | data_copy_size = btrfs_item_end_nr(l, mid) - leaf_data_end(root, l); | |
2100 | ||
2101 | copy_extent_buffer(right, l, btrfs_item_nr_offset(0), | |
2102 | btrfs_item_nr_offset(mid), | |
2103 | nritems * sizeof(struct btrfs_item)); | |
2104 | ||
2105 | copy_extent_buffer(right, l, | |
d6025579 CM |
2106 | btrfs_leaf_data(right) + BTRFS_LEAF_DATA_SIZE(root) - |
2107 | data_copy_size, btrfs_leaf_data(l) + | |
2108 | leaf_data_end(root, l), data_copy_size); | |
5f39d397 | 2109 | |
123abc88 | 2110 | rt_data_off = BTRFS_LEAF_DATA_SIZE(root) - |
5f39d397 | 2111 | btrfs_item_end_nr(l, mid); |
74123bd7 | 2112 | |
5f39d397 CM |
2113 | for (i = 0; i < nritems; i++) { |
2114 | struct btrfs_item *item = btrfs_item_nr(right, i); | |
db94535d CM |
2115 | u32 ioff; |
2116 | ||
2117 | if (!right->map_token) { | |
2118 | map_extent_buffer(right, (unsigned long)item, | |
2119 | sizeof(struct btrfs_item), | |
2120 | &right->map_token, &right->kaddr, | |
2121 | &right->map_start, &right->map_len, | |
2122 | KM_USER1); | |
2123 | } | |
2124 | ||
2125 | ioff = btrfs_item_offset(right, item); | |
5f39d397 | 2126 | btrfs_set_item_offset(right, item, ioff + rt_data_off); |
0783fcfc | 2127 | } |
74123bd7 | 2128 | |
db94535d CM |
2129 | if (right->map_token) { |
2130 | unmap_extent_buffer(right, right->map_token, KM_USER1); | |
2131 | right->map_token = NULL; | |
2132 | } | |
2133 | ||
5f39d397 | 2134 | btrfs_set_header_nritems(l, mid); |
aa5d6bed | 2135 | ret = 0; |
5f39d397 | 2136 | btrfs_item_key(right, &disk_key, 0); |
db94535d CM |
2137 | wret = insert_ptr(trans, root, path, &disk_key, right->start, |
2138 | path->slots[1] + 1, 1); | |
aa5d6bed CM |
2139 | if (wret) |
2140 | ret = wret; | |
5f39d397 CM |
2141 | |
2142 | btrfs_mark_buffer_dirty(right); | |
2143 | btrfs_mark_buffer_dirty(l); | |
eb60ceac | 2144 | BUG_ON(path->slots[0] != slot); |
5f39d397 | 2145 | |
be0e5c09 | 2146 | if (mid <= slot) { |
5f39d397 CM |
2147 | free_extent_buffer(path->nodes[0]); |
2148 | path->nodes[0] = right; | |
be0e5c09 CM |
2149 | path->slots[0] -= mid; |
2150 | path->slots[1] += 1; | |
eb60ceac | 2151 | } else |
5f39d397 CM |
2152 | free_extent_buffer(right); |
2153 | ||
eb60ceac | 2154 | BUG_ON(path->slots[0] < 0); |
d4dbff95 | 2155 | |
cc0c5538 CM |
2156 | if (double_split) { |
2157 | BUG_ON(num_doubles != 0); | |
2158 | num_doubles++; | |
2159 | goto again; | |
a429e513 | 2160 | } |
be0e5c09 CM |
2161 | return ret; |
2162 | } | |
2163 | ||
b18c6685 CM |
2164 | int btrfs_truncate_item(struct btrfs_trans_handle *trans, |
2165 | struct btrfs_root *root, | |
2166 | struct btrfs_path *path, | |
179e29e4 | 2167 | u32 new_size, int from_end) |
b18c6685 CM |
2168 | { |
2169 | int ret = 0; | |
2170 | int slot; | |
2171 | int slot_orig; | |
5f39d397 CM |
2172 | struct extent_buffer *leaf; |
2173 | struct btrfs_item *item; | |
b18c6685 CM |
2174 | u32 nritems; |
2175 | unsigned int data_end; | |
2176 | unsigned int old_data_start; | |
2177 | unsigned int old_size; | |
2178 | unsigned int size_diff; | |
2179 | int i; | |
2180 | ||
2181 | slot_orig = path->slots[0]; | |
5f39d397 | 2182 | leaf = path->nodes[0]; |
179e29e4 CM |
2183 | slot = path->slots[0]; |
2184 | ||
2185 | old_size = btrfs_item_size_nr(leaf, slot); | |
2186 | if (old_size == new_size) | |
2187 | return 0; | |
b18c6685 | 2188 | |
5f39d397 | 2189 | nritems = btrfs_header_nritems(leaf); |
b18c6685 CM |
2190 | data_end = leaf_data_end(root, leaf); |
2191 | ||
5f39d397 | 2192 | old_data_start = btrfs_item_offset_nr(leaf, slot); |
179e29e4 | 2193 | |
b18c6685 CM |
2194 | size_diff = old_size - new_size; |
2195 | ||
2196 | BUG_ON(slot < 0); | |
2197 | BUG_ON(slot >= nritems); | |
2198 | ||
2199 | /* | |
2200 | * item0..itemN ... dataN.offset..dataN.size .. data0.size | |
2201 | */ | |
2202 | /* first correct the data pointers */ | |
2203 | for (i = slot; i < nritems; i++) { | |
5f39d397 CM |
2204 | u32 ioff; |
2205 | item = btrfs_item_nr(leaf, i); | |
db94535d CM |
2206 | |
2207 | if (!leaf->map_token) { | |
2208 | map_extent_buffer(leaf, (unsigned long)item, | |
2209 | sizeof(struct btrfs_item), | |
2210 | &leaf->map_token, &leaf->kaddr, | |
2211 | &leaf->map_start, &leaf->map_len, | |
2212 | KM_USER1); | |
2213 | } | |
2214 | ||
5f39d397 CM |
2215 | ioff = btrfs_item_offset(leaf, item); |
2216 | btrfs_set_item_offset(leaf, item, ioff + size_diff); | |
b18c6685 | 2217 | } |
db94535d CM |
2218 | |
2219 | if (leaf->map_token) { | |
2220 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); | |
2221 | leaf->map_token = NULL; | |
2222 | } | |
2223 | ||
b18c6685 | 2224 | /* shift the data */ |
179e29e4 CM |
2225 | if (from_end) { |
2226 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + | |
2227 | data_end + size_diff, btrfs_leaf_data(leaf) + | |
2228 | data_end, old_data_start + new_size - data_end); | |
2229 | } else { | |
2230 | struct btrfs_disk_key disk_key; | |
2231 | u64 offset; | |
2232 | ||
2233 | btrfs_item_key(leaf, &disk_key, slot); | |
2234 | ||
2235 | if (btrfs_disk_key_type(&disk_key) == BTRFS_EXTENT_DATA_KEY) { | |
2236 | unsigned long ptr; | |
2237 | struct btrfs_file_extent_item *fi; | |
2238 | ||
2239 | fi = btrfs_item_ptr(leaf, slot, | |
2240 | struct btrfs_file_extent_item); | |
2241 | fi = (struct btrfs_file_extent_item *)( | |
2242 | (unsigned long)fi - size_diff); | |
2243 | ||
2244 | if (btrfs_file_extent_type(leaf, fi) == | |
2245 | BTRFS_FILE_EXTENT_INLINE) { | |
2246 | ptr = btrfs_item_ptr_offset(leaf, slot); | |
2247 | memmove_extent_buffer(leaf, ptr, | |
2248 | (unsigned long)fi, | |
2249 | offsetof(struct btrfs_file_extent_item, | |
2250 | disk_bytenr)); | |
2251 | } | |
2252 | } | |
2253 | ||
2254 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + | |
2255 | data_end + size_diff, btrfs_leaf_data(leaf) + | |
2256 | data_end, old_data_start - data_end); | |
2257 | ||
2258 | offset = btrfs_disk_key_offset(&disk_key); | |
2259 | btrfs_set_disk_key_offset(&disk_key, offset + size_diff); | |
2260 | btrfs_set_item_key(leaf, &disk_key, slot); | |
2261 | if (slot == 0) | |
2262 | fixup_low_keys(trans, root, path, &disk_key, 1); | |
2263 | } | |
5f39d397 CM |
2264 | |
2265 | item = btrfs_item_nr(leaf, slot); | |
2266 | btrfs_set_item_size(leaf, item, new_size); | |
2267 | btrfs_mark_buffer_dirty(leaf); | |
b18c6685 CM |
2268 | |
2269 | ret = 0; | |
5f39d397 CM |
2270 | if (btrfs_leaf_free_space(root, leaf) < 0) { |
2271 | btrfs_print_leaf(root, leaf); | |
b18c6685 | 2272 | BUG(); |
5f39d397 | 2273 | } |
b18c6685 CM |
2274 | return ret; |
2275 | } | |
2276 | ||
5f39d397 CM |
2277 | int btrfs_extend_item(struct btrfs_trans_handle *trans, |
2278 | struct btrfs_root *root, struct btrfs_path *path, | |
2279 | u32 data_size) | |
6567e837 CM |
2280 | { |
2281 | int ret = 0; | |
2282 | int slot; | |
2283 | int slot_orig; | |
5f39d397 CM |
2284 | struct extent_buffer *leaf; |
2285 | struct btrfs_item *item; | |
6567e837 CM |
2286 | u32 nritems; |
2287 | unsigned int data_end; | |
2288 | unsigned int old_data; | |
2289 | unsigned int old_size; | |
2290 | int i; | |
2291 | ||
2292 | slot_orig = path->slots[0]; | |
5f39d397 | 2293 | leaf = path->nodes[0]; |
6567e837 | 2294 | |
5f39d397 | 2295 | nritems = btrfs_header_nritems(leaf); |
6567e837 CM |
2296 | data_end = leaf_data_end(root, leaf); |
2297 | ||
5f39d397 CM |
2298 | if (btrfs_leaf_free_space(root, leaf) < data_size) { |
2299 | btrfs_print_leaf(root, leaf); | |
6567e837 | 2300 | BUG(); |
5f39d397 | 2301 | } |
6567e837 | 2302 | slot = path->slots[0]; |
5f39d397 | 2303 | old_data = btrfs_item_end_nr(leaf, slot); |
6567e837 CM |
2304 | |
2305 | BUG_ON(slot < 0); | |
3326d1b0 CM |
2306 | if (slot >= nritems) { |
2307 | btrfs_print_leaf(root, leaf); | |
2308 | printk("slot %d too large, nritems %d\n", slot, nritems); | |
2309 | BUG_ON(1); | |
2310 | } | |
6567e837 CM |
2311 | |
2312 | /* | |
2313 | * item0..itemN ... dataN.offset..dataN.size .. data0.size | |
2314 | */ | |
2315 | /* first correct the data pointers */ | |
2316 | for (i = slot; i < nritems; i++) { | |
5f39d397 CM |
2317 | u32 ioff; |
2318 | item = btrfs_item_nr(leaf, i); | |
db94535d CM |
2319 | |
2320 | if (!leaf->map_token) { | |
2321 | map_extent_buffer(leaf, (unsigned long)item, | |
2322 | sizeof(struct btrfs_item), | |
2323 | &leaf->map_token, &leaf->kaddr, | |
2324 | &leaf->map_start, &leaf->map_len, | |
2325 | KM_USER1); | |
2326 | } | |
5f39d397 CM |
2327 | ioff = btrfs_item_offset(leaf, item); |
2328 | btrfs_set_item_offset(leaf, item, ioff - data_size); | |
6567e837 | 2329 | } |
5f39d397 | 2330 | |
db94535d CM |
2331 | if (leaf->map_token) { |
2332 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); | |
2333 | leaf->map_token = NULL; | |
2334 | } | |
2335 | ||
6567e837 | 2336 | /* shift the data */ |
5f39d397 | 2337 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + |
6567e837 CM |
2338 | data_end - data_size, btrfs_leaf_data(leaf) + |
2339 | data_end, old_data - data_end); | |
5f39d397 | 2340 | |
6567e837 | 2341 | data_end = old_data; |
5f39d397 CM |
2342 | old_size = btrfs_item_size_nr(leaf, slot); |
2343 | item = btrfs_item_nr(leaf, slot); | |
2344 | btrfs_set_item_size(leaf, item, old_size + data_size); | |
2345 | btrfs_mark_buffer_dirty(leaf); | |
6567e837 CM |
2346 | |
2347 | ret = 0; | |
5f39d397 CM |
2348 | if (btrfs_leaf_free_space(root, leaf) < 0) { |
2349 | btrfs_print_leaf(root, leaf); | |
6567e837 | 2350 | BUG(); |
5f39d397 | 2351 | } |
6567e837 CM |
2352 | return ret; |
2353 | } | |
2354 | ||
74123bd7 CM |
2355 | /* |
2356 | * Given a key and some data, insert an item into the tree. | |
2357 | * This does all the path init required, making room in the tree if needed. | |
2358 | */ | |
9c58309d | 2359 | int btrfs_insert_empty_items(struct btrfs_trans_handle *trans, |
5f39d397 CM |
2360 | struct btrfs_root *root, |
2361 | struct btrfs_path *path, | |
9c58309d CM |
2362 | struct btrfs_key *cpu_key, u32 *data_size, |
2363 | int nr) | |
be0e5c09 | 2364 | { |
5f39d397 CM |
2365 | struct extent_buffer *leaf; |
2366 | struct btrfs_item *item; | |
aa5d6bed | 2367 | int ret = 0; |
be0e5c09 | 2368 | int slot; |
eb60ceac | 2369 | int slot_orig; |
9c58309d | 2370 | int i; |
7518a238 | 2371 | u32 nritems; |
9c58309d CM |
2372 | u32 total_size = 0; |
2373 | u32 total_data = 0; | |
be0e5c09 | 2374 | unsigned int data_end; |
e2fa7227 CM |
2375 | struct btrfs_disk_key disk_key; |
2376 | ||
9c58309d CM |
2377 | for (i = 0; i < nr; i++) { |
2378 | total_data += data_size[i]; | |
2379 | } | |
be0e5c09 | 2380 | |
74123bd7 | 2381 | /* create a root if there isn't one */ |
5c680ed6 | 2382 | if (!root->node) |
cfaa7295 | 2383 | BUG(); |
5f39d397 | 2384 | |
9c58309d CM |
2385 | total_size = total_data + (nr - 1) * sizeof(struct btrfs_item); |
2386 | ret = btrfs_search_slot(trans, root, cpu_key, path, total_size, 1); | |
eb60ceac | 2387 | if (ret == 0) { |
f0930a37 | 2388 | return -EEXIST; |
aa5d6bed | 2389 | } |
ed2ff2cb CM |
2390 | if (ret < 0) |
2391 | goto out; | |
be0e5c09 | 2392 | |
62e2749e | 2393 | slot_orig = path->slots[0]; |
5f39d397 | 2394 | leaf = path->nodes[0]; |
74123bd7 | 2395 | |
5f39d397 | 2396 | nritems = btrfs_header_nritems(leaf); |
123abc88 | 2397 | data_end = leaf_data_end(root, leaf); |
eb60ceac | 2398 | |
123abc88 | 2399 | if (btrfs_leaf_free_space(root, leaf) < |
9c58309d | 2400 | sizeof(struct btrfs_item) + total_size) { |
3326d1b0 CM |
2401 | btrfs_print_leaf(root, leaf); |
2402 | printk("not enough freespace need %u have %d\n", | |
9c58309d | 2403 | total_size, btrfs_leaf_free_space(root, leaf)); |
be0e5c09 | 2404 | BUG(); |
d4dbff95 | 2405 | } |
5f39d397 | 2406 | |
62e2749e | 2407 | slot = path->slots[0]; |
eb60ceac | 2408 | BUG_ON(slot < 0); |
5f39d397 | 2409 | |
be0e5c09 CM |
2410 | if (slot != nritems) { |
2411 | int i; | |
5f39d397 | 2412 | unsigned int old_data = btrfs_item_end_nr(leaf, slot); |
be0e5c09 | 2413 | |
5f39d397 CM |
2414 | if (old_data < data_end) { |
2415 | btrfs_print_leaf(root, leaf); | |
2416 | printk("slot %d old_data %d data_end %d\n", | |
2417 | slot, old_data, data_end); | |
2418 | BUG_ON(1); | |
2419 | } | |
be0e5c09 CM |
2420 | /* |
2421 | * item0..itemN ... dataN.offset..dataN.size .. data0.size | |
2422 | */ | |
2423 | /* first correct the data pointers */ | |
db94535d | 2424 | WARN_ON(leaf->map_token); |
0783fcfc | 2425 | for (i = slot; i < nritems; i++) { |
5f39d397 | 2426 | u32 ioff; |
db94535d | 2427 | |
5f39d397 | 2428 | item = btrfs_item_nr(leaf, i); |
db94535d CM |
2429 | if (!leaf->map_token) { |
2430 | map_extent_buffer(leaf, (unsigned long)item, | |
2431 | sizeof(struct btrfs_item), | |
2432 | &leaf->map_token, &leaf->kaddr, | |
2433 | &leaf->map_start, &leaf->map_len, | |
2434 | KM_USER1); | |
2435 | } | |
2436 | ||
5f39d397 | 2437 | ioff = btrfs_item_offset(leaf, item); |
9c58309d | 2438 | btrfs_set_item_offset(leaf, item, ioff - total_data); |
0783fcfc | 2439 | } |
db94535d CM |
2440 | if (leaf->map_token) { |
2441 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); | |
2442 | leaf->map_token = NULL; | |
2443 | } | |
be0e5c09 CM |
2444 | |
2445 | /* shift the items */ | |
9c58309d | 2446 | memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot + nr), |
5f39d397 | 2447 | btrfs_item_nr_offset(slot), |
d6025579 | 2448 | (nritems - slot) * sizeof(struct btrfs_item)); |
be0e5c09 CM |
2449 | |
2450 | /* shift the data */ | |
5f39d397 | 2451 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + |
9c58309d | 2452 | data_end - total_data, btrfs_leaf_data(leaf) + |
d6025579 | 2453 | data_end, old_data - data_end); |
be0e5c09 CM |
2454 | data_end = old_data; |
2455 | } | |
5f39d397 | 2456 | |
62e2749e | 2457 | /* setup the item for the new data */ |
9c58309d CM |
2458 | for (i = 0; i < nr; i++) { |
2459 | btrfs_cpu_key_to_disk(&disk_key, cpu_key + i); | |
2460 | btrfs_set_item_key(leaf, &disk_key, slot + i); | |
2461 | item = btrfs_item_nr(leaf, slot + i); | |
2462 | btrfs_set_item_offset(leaf, item, data_end - data_size[i]); | |
2463 | data_end -= data_size[i]; | |
2464 | btrfs_set_item_size(leaf, item, data_size[i]); | |
2465 | } | |
2466 | btrfs_set_header_nritems(leaf, nritems + nr); | |
5f39d397 | 2467 | btrfs_mark_buffer_dirty(leaf); |
aa5d6bed CM |
2468 | |
2469 | ret = 0; | |
5a01a2e3 CM |
2470 | if (slot == 0) { |
2471 | btrfs_cpu_key_to_disk(&disk_key, cpu_key); | |
e089f05c | 2472 | ret = fixup_low_keys(trans, root, path, &disk_key, 1); |
5a01a2e3 | 2473 | } |
aa5d6bed | 2474 | |
5f39d397 CM |
2475 | if (btrfs_leaf_free_space(root, leaf) < 0) { |
2476 | btrfs_print_leaf(root, leaf); | |
be0e5c09 | 2477 | BUG(); |
5f39d397 | 2478 | } |
5a01a2e3 | 2479 | |
ed2ff2cb | 2480 | out: |
62e2749e CM |
2481 | return ret; |
2482 | } | |
2483 | ||
2484 | /* | |
2485 | * Given a key and some data, insert an item into the tree. | |
2486 | * This does all the path init required, making room in the tree if needed. | |
2487 | */ | |
e089f05c CM |
2488 | int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root |
2489 | *root, struct btrfs_key *cpu_key, void *data, u32 | |
2490 | data_size) | |
62e2749e CM |
2491 | { |
2492 | int ret = 0; | |
2c90e5d6 | 2493 | struct btrfs_path *path; |
5f39d397 CM |
2494 | struct extent_buffer *leaf; |
2495 | unsigned long ptr; | |
62e2749e | 2496 | |
2c90e5d6 CM |
2497 | path = btrfs_alloc_path(); |
2498 | BUG_ON(!path); | |
2c90e5d6 | 2499 | ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); |
62e2749e | 2500 | if (!ret) { |
5f39d397 CM |
2501 | leaf = path->nodes[0]; |
2502 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2503 | write_extent_buffer(leaf, data, ptr, data_size); | |
2504 | btrfs_mark_buffer_dirty(leaf); | |
62e2749e | 2505 | } |
2c90e5d6 | 2506 | btrfs_free_path(path); |
aa5d6bed | 2507 | return ret; |
be0e5c09 CM |
2508 | } |
2509 | ||
74123bd7 | 2510 | /* |
5de08d7d | 2511 | * delete the pointer from a given node. |
74123bd7 CM |
2512 | * |
2513 | * If the delete empties a node, the node is removed from the tree, | |
2514 | * continuing all the way the root if required. The root is converted into | |
2515 | * a leaf if all the nodes are emptied. | |
2516 | */ | |
e089f05c CM |
2517 | static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
2518 | struct btrfs_path *path, int level, int slot) | |
be0e5c09 | 2519 | { |
5f39d397 | 2520 | struct extent_buffer *parent = path->nodes[level]; |
7518a238 | 2521 | u32 nritems; |
aa5d6bed | 2522 | int ret = 0; |
bb803951 | 2523 | int wret; |
be0e5c09 | 2524 | |
5f39d397 | 2525 | nritems = btrfs_header_nritems(parent); |
bb803951 | 2526 | if (slot != nritems -1) { |
5f39d397 CM |
2527 | memmove_extent_buffer(parent, |
2528 | btrfs_node_key_ptr_offset(slot), | |
2529 | btrfs_node_key_ptr_offset(slot + 1), | |
d6025579 CM |
2530 | sizeof(struct btrfs_key_ptr) * |
2531 | (nritems - slot - 1)); | |
bb803951 | 2532 | } |
7518a238 | 2533 | nritems--; |
5f39d397 | 2534 | btrfs_set_header_nritems(parent, nritems); |
7518a238 | 2535 | if (nritems == 0 && parent == root->node) { |
5f39d397 | 2536 | BUG_ON(btrfs_header_level(root->node) != 1); |
bb803951 | 2537 | /* just turn the root into a leaf and break */ |
5f39d397 | 2538 | btrfs_set_header_level(root->node, 0); |
bb803951 | 2539 | } else if (slot == 0) { |
5f39d397 CM |
2540 | struct btrfs_disk_key disk_key; |
2541 | ||
2542 | btrfs_node_key(parent, &disk_key, 0); | |
2543 | wret = fixup_low_keys(trans, root, path, &disk_key, level + 1); | |
0f70abe2 CM |
2544 | if (wret) |
2545 | ret = wret; | |
be0e5c09 | 2546 | } |
d6025579 | 2547 | btrfs_mark_buffer_dirty(parent); |
aa5d6bed | 2548 | return ret; |
be0e5c09 CM |
2549 | } |
2550 | ||
74123bd7 CM |
2551 | /* |
2552 | * delete the item at the leaf level in path. If that empties | |
2553 | * the leaf, remove it from the tree | |
2554 | */ | |
85e21bac CM |
2555 | int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
2556 | struct btrfs_path *path, int slot, int nr) | |
be0e5c09 | 2557 | { |
5f39d397 CM |
2558 | struct extent_buffer *leaf; |
2559 | struct btrfs_item *item; | |
85e21bac CM |
2560 | int last_off; |
2561 | int dsize = 0; | |
aa5d6bed CM |
2562 | int ret = 0; |
2563 | int wret; | |
85e21bac | 2564 | int i; |
7518a238 | 2565 | u32 nritems; |
be0e5c09 | 2566 | |
5f39d397 | 2567 | leaf = path->nodes[0]; |
85e21bac CM |
2568 | last_off = btrfs_item_offset_nr(leaf, slot + nr - 1); |
2569 | ||
2570 | for (i = 0; i < nr; i++) | |
2571 | dsize += btrfs_item_size_nr(leaf, slot + i); | |
2572 | ||
5f39d397 | 2573 | nritems = btrfs_header_nritems(leaf); |
be0e5c09 | 2574 | |
85e21bac | 2575 | if (slot + nr != nritems) { |
be0e5c09 | 2576 | int i; |
123abc88 | 2577 | int data_end = leaf_data_end(root, leaf); |
5f39d397 CM |
2578 | |
2579 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + | |
d6025579 CM |
2580 | data_end + dsize, |
2581 | btrfs_leaf_data(leaf) + data_end, | |
85e21bac | 2582 | last_off - data_end); |
5f39d397 | 2583 | |
85e21bac | 2584 | for (i = slot + nr; i < nritems; i++) { |
5f39d397 | 2585 | u32 ioff; |
db94535d | 2586 | |
5f39d397 | 2587 | item = btrfs_item_nr(leaf, i); |
db94535d CM |
2588 | if (!leaf->map_token) { |
2589 | map_extent_buffer(leaf, (unsigned long)item, | |
2590 | sizeof(struct btrfs_item), | |
2591 | &leaf->map_token, &leaf->kaddr, | |
2592 | &leaf->map_start, &leaf->map_len, | |
2593 | KM_USER1); | |
2594 | } | |
5f39d397 CM |
2595 | ioff = btrfs_item_offset(leaf, item); |
2596 | btrfs_set_item_offset(leaf, item, ioff + dsize); | |
0783fcfc | 2597 | } |
db94535d CM |
2598 | |
2599 | if (leaf->map_token) { | |
2600 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); | |
2601 | leaf->map_token = NULL; | |
2602 | } | |
2603 | ||
5f39d397 | 2604 | memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot), |
85e21bac | 2605 | btrfs_item_nr_offset(slot + nr), |
d6025579 | 2606 | sizeof(struct btrfs_item) * |
85e21bac | 2607 | (nritems - slot - nr)); |
be0e5c09 | 2608 | } |
85e21bac CM |
2609 | btrfs_set_header_nritems(leaf, nritems - nr); |
2610 | nritems -= nr; | |
5f39d397 | 2611 | |
74123bd7 | 2612 | /* delete the leaf if we've emptied it */ |
7518a238 | 2613 | if (nritems == 0) { |
5f39d397 CM |
2614 | if (leaf == root->node) { |
2615 | btrfs_set_header_level(leaf, 0); | |
9a8dd150 | 2616 | } else { |
7bb86316 | 2617 | u64 root_gen = btrfs_header_generation(path->nodes[1]); |
5f39d397 CM |
2618 | clean_tree_block(trans, root, leaf); |
2619 | wait_on_tree_block_writeback(root, leaf); | |
e089f05c | 2620 | wret = del_ptr(trans, root, path, 1, path->slots[1]); |
aa5d6bed CM |
2621 | if (wret) |
2622 | ret = wret; | |
e089f05c | 2623 | wret = btrfs_free_extent(trans, root, |
7bb86316 CM |
2624 | leaf->start, leaf->len, |
2625 | btrfs_header_owner(path->nodes[1]), | |
2626 | root_gen, 0, 0, 1); | |
0f70abe2 CM |
2627 | if (wret) |
2628 | ret = wret; | |
9a8dd150 | 2629 | } |
be0e5c09 | 2630 | } else { |
7518a238 | 2631 | int used = leaf_space_used(leaf, 0, nritems); |
aa5d6bed | 2632 | if (slot == 0) { |
5f39d397 CM |
2633 | struct btrfs_disk_key disk_key; |
2634 | ||
2635 | btrfs_item_key(leaf, &disk_key, 0); | |
e089f05c | 2636 | wret = fixup_low_keys(trans, root, path, |
5f39d397 | 2637 | &disk_key, 1); |
aa5d6bed CM |
2638 | if (wret) |
2639 | ret = wret; | |
2640 | } | |
aa5d6bed | 2641 | |
74123bd7 | 2642 | /* delete the leaf if it is mostly empty */ |
85e21bac | 2643 | if (used < BTRFS_LEAF_DATA_SIZE(root) / 4) { |
be0e5c09 CM |
2644 | /* push_leaf_left fixes the path. |
2645 | * make sure the path still points to our leaf | |
2646 | * for possible call to del_ptr below | |
2647 | */ | |
4920c9ac | 2648 | slot = path->slots[1]; |
5f39d397 CM |
2649 | extent_buffer_get(leaf); |
2650 | ||
85e21bac | 2651 | wret = push_leaf_left(trans, root, path, 1, 1); |
54aa1f4d | 2652 | if (wret < 0 && wret != -ENOSPC) |
aa5d6bed | 2653 | ret = wret; |
5f39d397 CM |
2654 | |
2655 | if (path->nodes[0] == leaf && | |
2656 | btrfs_header_nritems(leaf)) { | |
85e21bac | 2657 | wret = push_leaf_right(trans, root, path, 1, 1); |
54aa1f4d | 2658 | if (wret < 0 && wret != -ENOSPC) |
aa5d6bed CM |
2659 | ret = wret; |
2660 | } | |
5f39d397 CM |
2661 | |
2662 | if (btrfs_header_nritems(leaf) == 0) { | |
7bb86316 | 2663 | u64 root_gen; |
db94535d CM |
2664 | u64 bytenr = leaf->start; |
2665 | u32 blocksize = leaf->len; | |
5f39d397 | 2666 | |
7bb86316 CM |
2667 | root_gen = btrfs_header_generation( |
2668 | path->nodes[1]); | |
2669 | ||
5f39d397 CM |
2670 | clean_tree_block(trans, root, leaf); |
2671 | wait_on_tree_block_writeback(root, leaf); | |
2672 | ||
e089f05c | 2673 | wret = del_ptr(trans, root, path, 1, slot); |
aa5d6bed CM |
2674 | if (wret) |
2675 | ret = wret; | |
5f39d397 CM |
2676 | |
2677 | free_extent_buffer(leaf); | |
db94535d | 2678 | wret = btrfs_free_extent(trans, root, bytenr, |
7bb86316 CM |
2679 | blocksize, |
2680 | btrfs_header_owner(path->nodes[1]), | |
2681 | root_gen, 0, 0, 1); | |
0f70abe2 CM |
2682 | if (wret) |
2683 | ret = wret; | |
5de08d7d | 2684 | } else { |
5f39d397 CM |
2685 | btrfs_mark_buffer_dirty(leaf); |
2686 | free_extent_buffer(leaf); | |
be0e5c09 | 2687 | } |
d5719762 | 2688 | } else { |
5f39d397 | 2689 | btrfs_mark_buffer_dirty(leaf); |
be0e5c09 CM |
2690 | } |
2691 | } | |
aa5d6bed | 2692 | return ret; |
be0e5c09 CM |
2693 | } |
2694 | ||
7bb86316 CM |
2695 | /* |
2696 | * walk up the tree as far as required to find the previous leaf. | |
2697 | * returns 0 if it found something or 1 if there are no lesser leaves. | |
2698 | * returns < 0 on io errors. | |
2699 | */ | |
2700 | int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path) | |
2701 | { | |
8f662a76 | 2702 | u64 bytenr; |
7bb86316 CM |
2703 | int slot; |
2704 | int level = 1; | |
7bb86316 CM |
2705 | struct extent_buffer *c; |
2706 | struct extent_buffer *next = NULL; | |
2707 | ||
2708 | while(level < BTRFS_MAX_LEVEL) { | |
2709 | if (!path->nodes[level]) | |
2710 | return 1; | |
2711 | ||
2712 | slot = path->slots[level]; | |
2713 | c = path->nodes[level]; | |
2714 | if (slot == 0) { | |
2715 | level++; | |
2716 | if (level == BTRFS_MAX_LEVEL) | |
2717 | return 1; | |
2718 | continue; | |
2719 | } | |
2720 | slot--; | |
2721 | ||
2722 | bytenr = btrfs_node_blockptr(c, slot); | |
2723 | if (next) | |
2724 | free_extent_buffer(next); | |
2725 | ||
7bb86316 CM |
2726 | next = read_tree_block(root, bytenr, |
2727 | btrfs_level_size(root, level - 1)); | |
2728 | break; | |
2729 | } | |
2730 | path->slots[level] = slot; | |
2731 | while(1) { | |
2732 | level--; | |
2733 | c = path->nodes[level]; | |
2734 | free_extent_buffer(c); | |
8f662a76 CM |
2735 | slot = btrfs_header_nritems(next); |
2736 | if (slot != 0) | |
2737 | slot--; | |
7bb86316 | 2738 | path->nodes[level] = next; |
8f662a76 | 2739 | path->slots[level] = slot; |
7bb86316 CM |
2740 | if (!level) |
2741 | break; | |
8f662a76 | 2742 | next = read_tree_block(root, btrfs_node_blockptr(next, slot), |
7bb86316 CM |
2743 | btrfs_level_size(root, level - 1)); |
2744 | } | |
2745 | return 0; | |
2746 | } | |
2747 | ||
97571fd0 CM |
2748 | /* |
2749 | * walk up the tree as far as required to find the next leaf. | |
0f70abe2 CM |
2750 | * returns 0 if it found something or 1 if there are no greater leaves. |
2751 | * returns < 0 on io errors. | |
97571fd0 | 2752 | */ |
234b63a0 | 2753 | int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path) |
d97e63b6 CM |
2754 | { |
2755 | int slot; | |
2756 | int level = 1; | |
db94535d | 2757 | u64 bytenr; |
5f39d397 CM |
2758 | struct extent_buffer *c; |
2759 | struct extent_buffer *next = NULL; | |
d97e63b6 | 2760 | |
234b63a0 | 2761 | while(level < BTRFS_MAX_LEVEL) { |
d97e63b6 | 2762 | if (!path->nodes[level]) |
0f70abe2 | 2763 | return 1; |
5f39d397 | 2764 | |
d97e63b6 CM |
2765 | slot = path->slots[level] + 1; |
2766 | c = path->nodes[level]; | |
5f39d397 | 2767 | if (slot >= btrfs_header_nritems(c)) { |
d97e63b6 | 2768 | level++; |
7bb86316 CM |
2769 | if (level == BTRFS_MAX_LEVEL) |
2770 | return 1; | |
d97e63b6 CM |
2771 | continue; |
2772 | } | |
5f39d397 | 2773 | |
db94535d | 2774 | bytenr = btrfs_node_blockptr(c, slot); |
cfaa7295 | 2775 | if (next) |
5f39d397 CM |
2776 | free_extent_buffer(next); |
2777 | ||
6702ed49 | 2778 | if (path->reada) |
01f46658 | 2779 | reada_for_search(root, path, level, slot, 0); |
5f39d397 | 2780 | |
db94535d CM |
2781 | next = read_tree_block(root, bytenr, |
2782 | btrfs_level_size(root, level -1)); | |
d97e63b6 CM |
2783 | break; |
2784 | } | |
2785 | path->slots[level] = slot; | |
2786 | while(1) { | |
2787 | level--; | |
2788 | c = path->nodes[level]; | |
5f39d397 | 2789 | free_extent_buffer(c); |
d97e63b6 CM |
2790 | path->nodes[level] = next; |
2791 | path->slots[level] = 0; | |
2792 | if (!level) | |
2793 | break; | |
6702ed49 | 2794 | if (path->reada) |
01f46658 | 2795 | reada_for_search(root, path, level, 0, 0); |
db94535d CM |
2796 | next = read_tree_block(root, btrfs_node_blockptr(next, 0), |
2797 | btrfs_level_size(root, level - 1)); | |
d97e63b6 CM |
2798 | } |
2799 | return 0; | |
2800 | } | |
0b86a832 CM |
2801 | |
2802 | int btrfs_previous_item(struct btrfs_root *root, | |
2803 | struct btrfs_path *path, u64 min_objectid, | |
2804 | int type) | |
2805 | { | |
2806 | struct btrfs_key found_key; | |
2807 | struct extent_buffer *leaf; | |
2808 | int ret; | |
2809 | ||
2810 | while(1) { | |
2811 | if (path->slots[0] == 0) { | |
2812 | ret = btrfs_prev_leaf(root, path); | |
2813 | if (ret != 0) | |
2814 | return ret; | |
2815 | } else { | |
2816 | path->slots[0]--; | |
2817 | } | |
2818 | leaf = path->nodes[0]; | |
2819 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
2820 | if (found_key.type == type) | |
2821 | return 0; | |
2822 | } | |
2823 | return 1; | |
2824 | } | |
2825 |