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0b86a832 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 | #include <linux/sched.h> | |
19 | #include <linux/bio.h> | |
8a4b83cc | 20 | #include <linux/buffer_head.h> |
f2d8d74d | 21 | #include <linux/blkdev.h> |
788f20eb | 22 | #include <linux/random.h> |
593060d7 | 23 | #include <asm/div64.h> |
0b86a832 CM |
24 | #include "ctree.h" |
25 | #include "extent_map.h" | |
26 | #include "disk-io.h" | |
27 | #include "transaction.h" | |
28 | #include "print-tree.h" | |
29 | #include "volumes.h" | |
30 | ||
593060d7 CM |
31 | struct map_lookup { |
32 | u64 type; | |
33 | int io_align; | |
34 | int io_width; | |
35 | int stripe_len; | |
36 | int sector_size; | |
37 | int num_stripes; | |
321aecc6 | 38 | int sub_stripes; |
cea9e445 | 39 | struct btrfs_bio_stripe stripes[]; |
593060d7 CM |
40 | }; |
41 | ||
42 | #define map_lookup_size(n) (sizeof(struct map_lookup) + \ | |
cea9e445 | 43 | (sizeof(struct btrfs_bio_stripe) * (n))) |
593060d7 | 44 | |
8a4b83cc CM |
45 | static DEFINE_MUTEX(uuid_mutex); |
46 | static LIST_HEAD(fs_uuids); | |
47 | ||
a061fc8d CM |
48 | void btrfs_lock_volumes(void) |
49 | { | |
50 | mutex_lock(&uuid_mutex); | |
51 | } | |
52 | ||
53 | void btrfs_unlock_volumes(void) | |
54 | { | |
55 | mutex_unlock(&uuid_mutex); | |
56 | } | |
57 | ||
8a4b83cc CM |
58 | int btrfs_cleanup_fs_uuids(void) |
59 | { | |
60 | struct btrfs_fs_devices *fs_devices; | |
61 | struct list_head *uuid_cur; | |
62 | struct list_head *devices_cur; | |
63 | struct btrfs_device *dev; | |
64 | ||
65 | list_for_each(uuid_cur, &fs_uuids) { | |
66 | fs_devices = list_entry(uuid_cur, struct btrfs_fs_devices, | |
67 | list); | |
68 | while(!list_empty(&fs_devices->devices)) { | |
69 | devices_cur = fs_devices->devices.next; | |
70 | dev = list_entry(devices_cur, struct btrfs_device, | |
71 | dev_list); | |
8a4b83cc | 72 | if (dev->bdev) { |
8a4b83cc | 73 | close_bdev_excl(dev->bdev); |
a0af469b | 74 | fs_devices->open_devices--; |
8a4b83cc CM |
75 | } |
76 | list_del(&dev->dev_list); | |
dfe25020 | 77 | kfree(dev->name); |
8a4b83cc CM |
78 | kfree(dev); |
79 | } | |
80 | } | |
81 | return 0; | |
82 | } | |
83 | ||
a443755f CM |
84 | static struct btrfs_device *__find_device(struct list_head *head, u64 devid, |
85 | u8 *uuid) | |
8a4b83cc CM |
86 | { |
87 | struct btrfs_device *dev; | |
88 | struct list_head *cur; | |
89 | ||
90 | list_for_each(cur, head) { | |
91 | dev = list_entry(cur, struct btrfs_device, dev_list); | |
a443755f | 92 | if (dev->devid == devid && |
8f18cf13 | 93 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
8a4b83cc | 94 | return dev; |
a443755f | 95 | } |
8a4b83cc CM |
96 | } |
97 | return NULL; | |
98 | } | |
99 | ||
100 | static struct btrfs_fs_devices *find_fsid(u8 *fsid) | |
101 | { | |
102 | struct list_head *cur; | |
103 | struct btrfs_fs_devices *fs_devices; | |
104 | ||
105 | list_for_each(cur, &fs_uuids) { | |
106 | fs_devices = list_entry(cur, struct btrfs_fs_devices, list); | |
107 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) | |
108 | return fs_devices; | |
109 | } | |
110 | return NULL; | |
111 | } | |
112 | ||
113 | static int device_list_add(const char *path, | |
114 | struct btrfs_super_block *disk_super, | |
115 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) | |
116 | { | |
117 | struct btrfs_device *device; | |
118 | struct btrfs_fs_devices *fs_devices; | |
119 | u64 found_transid = btrfs_super_generation(disk_super); | |
120 | ||
121 | fs_devices = find_fsid(disk_super->fsid); | |
122 | if (!fs_devices) { | |
515dc322 | 123 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
8a4b83cc CM |
124 | if (!fs_devices) |
125 | return -ENOMEM; | |
126 | INIT_LIST_HEAD(&fs_devices->devices); | |
b3075717 | 127 | INIT_LIST_HEAD(&fs_devices->alloc_list); |
8a4b83cc CM |
128 | list_add(&fs_devices->list, &fs_uuids); |
129 | memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE); | |
130 | fs_devices->latest_devid = devid; | |
131 | fs_devices->latest_trans = found_transid; | |
8a4b83cc CM |
132 | device = NULL; |
133 | } else { | |
a443755f CM |
134 | device = __find_device(&fs_devices->devices, devid, |
135 | disk_super->dev_item.uuid); | |
8a4b83cc CM |
136 | } |
137 | if (!device) { | |
138 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
139 | if (!device) { | |
140 | /* we can safely leave the fs_devices entry around */ | |
141 | return -ENOMEM; | |
142 | } | |
143 | device->devid = devid; | |
a443755f CM |
144 | memcpy(device->uuid, disk_super->dev_item.uuid, |
145 | BTRFS_UUID_SIZE); | |
f2984462 | 146 | device->barriers = 1; |
b248a415 | 147 | spin_lock_init(&device->io_lock); |
8a4b83cc CM |
148 | device->name = kstrdup(path, GFP_NOFS); |
149 | if (!device->name) { | |
150 | kfree(device); | |
151 | return -ENOMEM; | |
152 | } | |
153 | list_add(&device->dev_list, &fs_devices->devices); | |
b3075717 | 154 | list_add(&device->dev_alloc_list, &fs_devices->alloc_list); |
8a4b83cc CM |
155 | fs_devices->num_devices++; |
156 | } | |
157 | ||
158 | if (found_transid > fs_devices->latest_trans) { | |
159 | fs_devices->latest_devid = devid; | |
160 | fs_devices->latest_trans = found_transid; | |
161 | } | |
8a4b83cc CM |
162 | *fs_devices_ret = fs_devices; |
163 | return 0; | |
164 | } | |
165 | ||
dfe25020 CM |
166 | int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices) |
167 | { | |
168 | struct list_head *head = &fs_devices->devices; | |
169 | struct list_head *cur; | |
170 | struct btrfs_device *device; | |
171 | ||
172 | mutex_lock(&uuid_mutex); | |
173 | again: | |
174 | list_for_each(cur, head) { | |
175 | device = list_entry(cur, struct btrfs_device, dev_list); | |
176 | if (!device->in_fs_metadata) { | |
a0af469b | 177 | if (device->bdev) { |
dfe25020 | 178 | close_bdev_excl(device->bdev); |
a0af469b CM |
179 | fs_devices->open_devices--; |
180 | } | |
dfe25020 CM |
181 | list_del(&device->dev_list); |
182 | list_del(&device->dev_alloc_list); | |
183 | fs_devices->num_devices--; | |
184 | kfree(device->name); | |
185 | kfree(device); | |
186 | goto again; | |
187 | } | |
188 | } | |
189 | mutex_unlock(&uuid_mutex); | |
190 | return 0; | |
191 | } | |
a0af469b | 192 | |
8a4b83cc CM |
193 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
194 | { | |
195 | struct list_head *head = &fs_devices->devices; | |
196 | struct list_head *cur; | |
197 | struct btrfs_device *device; | |
198 | ||
199 | mutex_lock(&uuid_mutex); | |
200 | list_for_each(cur, head) { | |
201 | device = list_entry(cur, struct btrfs_device, dev_list); | |
202 | if (device->bdev) { | |
203 | close_bdev_excl(device->bdev); | |
a0af469b | 204 | fs_devices->open_devices--; |
8a4b83cc CM |
205 | } |
206 | device->bdev = NULL; | |
dfe25020 | 207 | device->in_fs_metadata = 0; |
8a4b83cc | 208 | } |
a0af469b | 209 | fs_devices->mounted = 0; |
8a4b83cc CM |
210 | mutex_unlock(&uuid_mutex); |
211 | return 0; | |
212 | } | |
213 | ||
214 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, | |
215 | int flags, void *holder) | |
216 | { | |
217 | struct block_device *bdev; | |
218 | struct list_head *head = &fs_devices->devices; | |
219 | struct list_head *cur; | |
220 | struct btrfs_device *device; | |
a0af469b CM |
221 | struct block_device *latest_bdev = NULL; |
222 | struct buffer_head *bh; | |
223 | struct btrfs_super_block *disk_super; | |
224 | u64 latest_devid = 0; | |
225 | u64 latest_transid = 0; | |
226 | u64 transid; | |
227 | u64 devid; | |
228 | int ret = 0; | |
8a4b83cc CM |
229 | |
230 | mutex_lock(&uuid_mutex); | |
a0af469b CM |
231 | if (fs_devices->mounted) |
232 | goto out; | |
233 | ||
8a4b83cc CM |
234 | list_for_each(cur, head) { |
235 | device = list_entry(cur, struct btrfs_device, dev_list); | |
c1c4d91c CM |
236 | if (device->bdev) |
237 | continue; | |
238 | ||
dfe25020 CM |
239 | if (!device->name) |
240 | continue; | |
241 | ||
8a4b83cc | 242 | bdev = open_bdev_excl(device->name, flags, holder); |
e17cade2 | 243 | |
8a4b83cc CM |
244 | if (IS_ERR(bdev)) { |
245 | printk("open %s failed\n", device->name); | |
a0af469b | 246 | goto error; |
8a4b83cc | 247 | } |
a061fc8d | 248 | set_blocksize(bdev, 4096); |
a0af469b CM |
249 | |
250 | bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096); | |
251 | if (!bh) | |
252 | goto error_close; | |
253 | ||
254 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
255 | if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, | |
256 | sizeof(disk_super->magic))) | |
257 | goto error_brelse; | |
258 | ||
259 | devid = le64_to_cpu(disk_super->dev_item.devid); | |
260 | if (devid != device->devid) | |
261 | goto error_brelse; | |
262 | ||
263 | transid = btrfs_super_generation(disk_super); | |
6af5ac3c | 264 | if (!latest_transid || transid > latest_transid) { |
a0af469b CM |
265 | latest_devid = devid; |
266 | latest_transid = transid; | |
267 | latest_bdev = bdev; | |
268 | } | |
269 | ||
8a4b83cc | 270 | device->bdev = bdev; |
dfe25020 | 271 | device->in_fs_metadata = 0; |
a0af469b CM |
272 | fs_devices->open_devices++; |
273 | continue; | |
a061fc8d | 274 | |
a0af469b CM |
275 | error_brelse: |
276 | brelse(bh); | |
277 | error_close: | |
278 | close_bdev_excl(bdev); | |
279 | error: | |
280 | continue; | |
8a4b83cc | 281 | } |
a0af469b CM |
282 | if (fs_devices->open_devices == 0) { |
283 | ret = -EIO; | |
284 | goto out; | |
285 | } | |
286 | fs_devices->mounted = 1; | |
287 | fs_devices->latest_bdev = latest_bdev; | |
288 | fs_devices->latest_devid = latest_devid; | |
289 | fs_devices->latest_trans = latest_transid; | |
290 | out: | |
8a4b83cc | 291 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
292 | return ret; |
293 | } | |
294 | ||
295 | int btrfs_scan_one_device(const char *path, int flags, void *holder, | |
296 | struct btrfs_fs_devices **fs_devices_ret) | |
297 | { | |
298 | struct btrfs_super_block *disk_super; | |
299 | struct block_device *bdev; | |
300 | struct buffer_head *bh; | |
301 | int ret; | |
302 | u64 devid; | |
f2984462 | 303 | u64 transid; |
8a4b83cc CM |
304 | |
305 | mutex_lock(&uuid_mutex); | |
306 | ||
8a4b83cc CM |
307 | bdev = open_bdev_excl(path, flags, holder); |
308 | ||
309 | if (IS_ERR(bdev)) { | |
8a4b83cc CM |
310 | ret = PTR_ERR(bdev); |
311 | goto error; | |
312 | } | |
313 | ||
314 | ret = set_blocksize(bdev, 4096); | |
315 | if (ret) | |
316 | goto error_close; | |
317 | bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096); | |
318 | if (!bh) { | |
319 | ret = -EIO; | |
320 | goto error_close; | |
321 | } | |
322 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
323 | if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, | |
324 | sizeof(disk_super->magic))) { | |
e58ca020 | 325 | ret = -EINVAL; |
8a4b83cc CM |
326 | goto error_brelse; |
327 | } | |
328 | devid = le64_to_cpu(disk_super->dev_item.devid); | |
f2984462 | 329 | transid = btrfs_super_generation(disk_super); |
7ae9c09d CM |
330 | if (disk_super->label[0]) |
331 | printk("device label %s ", disk_super->label); | |
332 | else { | |
333 | /* FIXME, make a readl uuid parser */ | |
334 | printk("device fsid %llx-%llx ", | |
335 | *(unsigned long long *)disk_super->fsid, | |
336 | *(unsigned long long *)(disk_super->fsid + 8)); | |
337 | } | |
338 | printk("devid %Lu transid %Lu %s\n", devid, transid, path); | |
8a4b83cc CM |
339 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
340 | ||
341 | error_brelse: | |
342 | brelse(bh); | |
343 | error_close: | |
344 | close_bdev_excl(bdev); | |
8a4b83cc CM |
345 | error: |
346 | mutex_unlock(&uuid_mutex); | |
347 | return ret; | |
348 | } | |
0b86a832 CM |
349 | |
350 | /* | |
351 | * this uses a pretty simple search, the expectation is that it is | |
352 | * called very infrequently and that a given device has a small number | |
353 | * of extents | |
354 | */ | |
355 | static int find_free_dev_extent(struct btrfs_trans_handle *trans, | |
356 | struct btrfs_device *device, | |
357 | struct btrfs_path *path, | |
358 | u64 num_bytes, u64 *start) | |
359 | { | |
360 | struct btrfs_key key; | |
361 | struct btrfs_root *root = device->dev_root; | |
362 | struct btrfs_dev_extent *dev_extent = NULL; | |
363 | u64 hole_size = 0; | |
364 | u64 last_byte = 0; | |
365 | u64 search_start = 0; | |
366 | u64 search_end = device->total_bytes; | |
367 | int ret; | |
368 | int slot = 0; | |
369 | int start_found; | |
370 | struct extent_buffer *l; | |
371 | ||
372 | start_found = 0; | |
373 | path->reada = 2; | |
374 | ||
375 | /* FIXME use last free of some kind */ | |
376 | ||
8a4b83cc CM |
377 | /* we don't want to overwrite the superblock on the drive, |
378 | * so we make sure to start at an offset of at least 1MB | |
379 | */ | |
380 | search_start = max((u64)1024 * 1024, search_start); | |
8f18cf13 CM |
381 | |
382 | if (root->fs_info->alloc_start + num_bytes <= device->total_bytes) | |
383 | search_start = max(root->fs_info->alloc_start, search_start); | |
384 | ||
0b86a832 CM |
385 | key.objectid = device->devid; |
386 | key.offset = search_start; | |
387 | key.type = BTRFS_DEV_EXTENT_KEY; | |
388 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); | |
389 | if (ret < 0) | |
390 | goto error; | |
391 | ret = btrfs_previous_item(root, path, 0, key.type); | |
392 | if (ret < 0) | |
393 | goto error; | |
394 | l = path->nodes[0]; | |
395 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
396 | while (1) { | |
397 | l = path->nodes[0]; | |
398 | slot = path->slots[0]; | |
399 | if (slot >= btrfs_header_nritems(l)) { | |
400 | ret = btrfs_next_leaf(root, path); | |
401 | if (ret == 0) | |
402 | continue; | |
403 | if (ret < 0) | |
404 | goto error; | |
405 | no_more_items: | |
406 | if (!start_found) { | |
407 | if (search_start >= search_end) { | |
408 | ret = -ENOSPC; | |
409 | goto error; | |
410 | } | |
411 | *start = search_start; | |
412 | start_found = 1; | |
413 | goto check_pending; | |
414 | } | |
415 | *start = last_byte > search_start ? | |
416 | last_byte : search_start; | |
417 | if (search_end <= *start) { | |
418 | ret = -ENOSPC; | |
419 | goto error; | |
420 | } | |
421 | goto check_pending; | |
422 | } | |
423 | btrfs_item_key_to_cpu(l, &key, slot); | |
424 | ||
425 | if (key.objectid < device->devid) | |
426 | goto next; | |
427 | ||
428 | if (key.objectid > device->devid) | |
429 | goto no_more_items; | |
430 | ||
431 | if (key.offset >= search_start && key.offset > last_byte && | |
432 | start_found) { | |
433 | if (last_byte < search_start) | |
434 | last_byte = search_start; | |
435 | hole_size = key.offset - last_byte; | |
436 | if (key.offset > last_byte && | |
437 | hole_size >= num_bytes) { | |
438 | *start = last_byte; | |
439 | goto check_pending; | |
440 | } | |
441 | } | |
442 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) { | |
443 | goto next; | |
444 | } | |
445 | ||
446 | start_found = 1; | |
447 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
448 | last_byte = key.offset + btrfs_dev_extent_length(l, dev_extent); | |
449 | next: | |
450 | path->slots[0]++; | |
451 | cond_resched(); | |
452 | } | |
453 | check_pending: | |
454 | /* we have to make sure we didn't find an extent that has already | |
455 | * been allocated by the map tree or the original allocation | |
456 | */ | |
457 | btrfs_release_path(root, path); | |
458 | BUG_ON(*start < search_start); | |
459 | ||
6324fbf3 | 460 | if (*start + num_bytes > search_end) { |
0b86a832 CM |
461 | ret = -ENOSPC; |
462 | goto error; | |
463 | } | |
464 | /* check for pending inserts here */ | |
465 | return 0; | |
466 | ||
467 | error: | |
468 | btrfs_release_path(root, path); | |
469 | return ret; | |
470 | } | |
471 | ||
8f18cf13 CM |
472 | int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
473 | struct btrfs_device *device, | |
474 | u64 start) | |
475 | { | |
476 | int ret; | |
477 | struct btrfs_path *path; | |
478 | struct btrfs_root *root = device->dev_root; | |
479 | struct btrfs_key key; | |
a061fc8d CM |
480 | struct btrfs_key found_key; |
481 | struct extent_buffer *leaf = NULL; | |
482 | struct btrfs_dev_extent *extent = NULL; | |
8f18cf13 CM |
483 | |
484 | path = btrfs_alloc_path(); | |
485 | if (!path) | |
486 | return -ENOMEM; | |
487 | ||
488 | key.objectid = device->devid; | |
489 | key.offset = start; | |
490 | key.type = BTRFS_DEV_EXTENT_KEY; | |
491 | ||
492 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
a061fc8d CM |
493 | if (ret > 0) { |
494 | ret = btrfs_previous_item(root, path, key.objectid, | |
495 | BTRFS_DEV_EXTENT_KEY); | |
496 | BUG_ON(ret); | |
497 | leaf = path->nodes[0]; | |
498 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
499 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
500 | struct btrfs_dev_extent); | |
501 | BUG_ON(found_key.offset > start || found_key.offset + | |
502 | btrfs_dev_extent_length(leaf, extent) < start); | |
503 | ret = 0; | |
504 | } else if (ret == 0) { | |
505 | leaf = path->nodes[0]; | |
506 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
507 | struct btrfs_dev_extent); | |
508 | } | |
8f18cf13 CM |
509 | BUG_ON(ret); |
510 | ||
dfe25020 CM |
511 | if (device->bytes_used > 0) |
512 | device->bytes_used -= btrfs_dev_extent_length(leaf, extent); | |
8f18cf13 CM |
513 | ret = btrfs_del_item(trans, root, path); |
514 | BUG_ON(ret); | |
515 | ||
516 | btrfs_free_path(path); | |
517 | return ret; | |
518 | } | |
519 | ||
0b86a832 CM |
520 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
521 | struct btrfs_device *device, | |
e17cade2 CM |
522 | u64 chunk_tree, u64 chunk_objectid, |
523 | u64 chunk_offset, | |
524 | u64 num_bytes, u64 *start) | |
0b86a832 CM |
525 | { |
526 | int ret; | |
527 | struct btrfs_path *path; | |
528 | struct btrfs_root *root = device->dev_root; | |
529 | struct btrfs_dev_extent *extent; | |
530 | struct extent_buffer *leaf; | |
531 | struct btrfs_key key; | |
532 | ||
dfe25020 | 533 | WARN_ON(!device->in_fs_metadata); |
0b86a832 CM |
534 | path = btrfs_alloc_path(); |
535 | if (!path) | |
536 | return -ENOMEM; | |
537 | ||
538 | ret = find_free_dev_extent(trans, device, path, num_bytes, start); | |
6324fbf3 | 539 | if (ret) { |
0b86a832 | 540 | goto err; |
6324fbf3 | 541 | } |
0b86a832 CM |
542 | |
543 | key.objectid = device->devid; | |
544 | key.offset = *start; | |
545 | key.type = BTRFS_DEV_EXTENT_KEY; | |
546 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
547 | sizeof(*extent)); | |
548 | BUG_ON(ret); | |
549 | ||
550 | leaf = path->nodes[0]; | |
551 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
552 | struct btrfs_dev_extent); | |
e17cade2 CM |
553 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
554 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); | |
555 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); | |
556 | ||
557 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, | |
558 | (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent), | |
559 | BTRFS_UUID_SIZE); | |
560 | ||
0b86a832 CM |
561 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
562 | btrfs_mark_buffer_dirty(leaf); | |
563 | err: | |
564 | btrfs_free_path(path); | |
565 | return ret; | |
566 | } | |
567 | ||
e17cade2 | 568 | static int find_next_chunk(struct btrfs_root *root, u64 objectid, u64 *offset) |
0b86a832 CM |
569 | { |
570 | struct btrfs_path *path; | |
571 | int ret; | |
572 | struct btrfs_key key; | |
e17cade2 | 573 | struct btrfs_chunk *chunk; |
0b86a832 CM |
574 | struct btrfs_key found_key; |
575 | ||
576 | path = btrfs_alloc_path(); | |
577 | BUG_ON(!path); | |
578 | ||
e17cade2 | 579 | key.objectid = objectid; |
0b86a832 CM |
580 | key.offset = (u64)-1; |
581 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
582 | ||
583 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
584 | if (ret < 0) | |
585 | goto error; | |
586 | ||
587 | BUG_ON(ret == 0); | |
588 | ||
589 | ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY); | |
590 | if (ret) { | |
e17cade2 | 591 | *offset = 0; |
0b86a832 CM |
592 | } else { |
593 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
594 | path->slots[0]); | |
e17cade2 CM |
595 | if (found_key.objectid != objectid) |
596 | *offset = 0; | |
597 | else { | |
598 | chunk = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
599 | struct btrfs_chunk); | |
600 | *offset = found_key.offset + | |
601 | btrfs_chunk_length(path->nodes[0], chunk); | |
602 | } | |
0b86a832 CM |
603 | } |
604 | ret = 0; | |
605 | error: | |
606 | btrfs_free_path(path); | |
607 | return ret; | |
608 | } | |
609 | ||
0b86a832 CM |
610 | static int find_next_devid(struct btrfs_root *root, struct btrfs_path *path, |
611 | u64 *objectid) | |
612 | { | |
613 | int ret; | |
614 | struct btrfs_key key; | |
615 | struct btrfs_key found_key; | |
616 | ||
617 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
618 | key.type = BTRFS_DEV_ITEM_KEY; | |
619 | key.offset = (u64)-1; | |
620 | ||
621 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
622 | if (ret < 0) | |
623 | goto error; | |
624 | ||
625 | BUG_ON(ret == 0); | |
626 | ||
627 | ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID, | |
628 | BTRFS_DEV_ITEM_KEY); | |
629 | if (ret) { | |
630 | *objectid = 1; | |
631 | } else { | |
632 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
633 | path->slots[0]); | |
634 | *objectid = found_key.offset + 1; | |
635 | } | |
636 | ret = 0; | |
637 | error: | |
638 | btrfs_release_path(root, path); | |
639 | return ret; | |
640 | } | |
641 | ||
642 | /* | |
643 | * the device information is stored in the chunk root | |
644 | * the btrfs_device struct should be fully filled in | |
645 | */ | |
646 | int btrfs_add_device(struct btrfs_trans_handle *trans, | |
647 | struct btrfs_root *root, | |
648 | struct btrfs_device *device) | |
649 | { | |
650 | int ret; | |
651 | struct btrfs_path *path; | |
652 | struct btrfs_dev_item *dev_item; | |
653 | struct extent_buffer *leaf; | |
654 | struct btrfs_key key; | |
655 | unsigned long ptr; | |
006a58a2 | 656 | u64 free_devid = 0; |
0b86a832 CM |
657 | |
658 | root = root->fs_info->chunk_root; | |
659 | ||
660 | path = btrfs_alloc_path(); | |
661 | if (!path) | |
662 | return -ENOMEM; | |
663 | ||
664 | ret = find_next_devid(root, path, &free_devid); | |
665 | if (ret) | |
666 | goto out; | |
667 | ||
668 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
669 | key.type = BTRFS_DEV_ITEM_KEY; | |
670 | key.offset = free_devid; | |
671 | ||
672 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
0d81ba5d | 673 | sizeof(*dev_item)); |
0b86a832 CM |
674 | if (ret) |
675 | goto out; | |
676 | ||
677 | leaf = path->nodes[0]; | |
678 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
679 | ||
8a4b83cc | 680 | device->devid = free_devid; |
0b86a832 CM |
681 | btrfs_set_device_id(leaf, dev_item, device->devid); |
682 | btrfs_set_device_type(leaf, dev_item, device->type); | |
683 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
684 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
685 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
0b86a832 CM |
686 | btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); |
687 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); | |
e17cade2 CM |
688 | btrfs_set_device_group(leaf, dev_item, 0); |
689 | btrfs_set_device_seek_speed(leaf, dev_item, 0); | |
690 | btrfs_set_device_bandwidth(leaf, dev_item, 0); | |
0b86a832 | 691 | |
0b86a832 | 692 | ptr = (unsigned long)btrfs_device_uuid(dev_item); |
e17cade2 | 693 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 CM |
694 | btrfs_mark_buffer_dirty(leaf); |
695 | ret = 0; | |
696 | ||
697 | out: | |
698 | btrfs_free_path(path); | |
699 | return ret; | |
700 | } | |
8f18cf13 | 701 | |
a061fc8d CM |
702 | static int btrfs_rm_dev_item(struct btrfs_root *root, |
703 | struct btrfs_device *device) | |
704 | { | |
705 | int ret; | |
706 | struct btrfs_path *path; | |
707 | struct block_device *bdev = device->bdev; | |
708 | struct btrfs_device *next_dev; | |
709 | struct btrfs_key key; | |
710 | u64 total_bytes; | |
711 | struct btrfs_fs_devices *fs_devices; | |
712 | struct btrfs_trans_handle *trans; | |
713 | ||
714 | root = root->fs_info->chunk_root; | |
715 | ||
716 | path = btrfs_alloc_path(); | |
717 | if (!path) | |
718 | return -ENOMEM; | |
719 | ||
720 | trans = btrfs_start_transaction(root, 1); | |
721 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
722 | key.type = BTRFS_DEV_ITEM_KEY; | |
723 | key.offset = device->devid; | |
724 | ||
725 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
726 | if (ret < 0) | |
727 | goto out; | |
728 | ||
729 | if (ret > 0) { | |
730 | ret = -ENOENT; | |
731 | goto out; | |
732 | } | |
733 | ||
734 | ret = btrfs_del_item(trans, root, path); | |
735 | if (ret) | |
736 | goto out; | |
737 | ||
738 | /* | |
739 | * at this point, the device is zero sized. We want to | |
740 | * remove it from the devices list and zero out the old super | |
741 | */ | |
742 | list_del_init(&device->dev_list); | |
743 | list_del_init(&device->dev_alloc_list); | |
744 | fs_devices = root->fs_info->fs_devices; | |
745 | ||
746 | next_dev = list_entry(fs_devices->devices.next, struct btrfs_device, | |
747 | dev_list); | |
a061fc8d CM |
748 | if (bdev == root->fs_info->sb->s_bdev) |
749 | root->fs_info->sb->s_bdev = next_dev->bdev; | |
750 | if (bdev == fs_devices->latest_bdev) | |
751 | fs_devices->latest_bdev = next_dev->bdev; | |
752 | ||
a061fc8d CM |
753 | total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy); |
754 | btrfs_set_super_num_devices(&root->fs_info->super_copy, | |
755 | total_bytes - 1); | |
756 | out: | |
757 | btrfs_free_path(path); | |
758 | btrfs_commit_transaction(trans, root); | |
759 | return ret; | |
760 | } | |
761 | ||
762 | int btrfs_rm_device(struct btrfs_root *root, char *device_path) | |
763 | { | |
764 | struct btrfs_device *device; | |
765 | struct block_device *bdev; | |
dfe25020 | 766 | struct buffer_head *bh = NULL; |
a061fc8d CM |
767 | struct btrfs_super_block *disk_super; |
768 | u64 all_avail; | |
769 | u64 devid; | |
770 | int ret = 0; | |
771 | ||
772 | mutex_lock(&root->fs_info->fs_mutex); | |
773 | mutex_lock(&uuid_mutex); | |
774 | ||
775 | all_avail = root->fs_info->avail_data_alloc_bits | | |
776 | root->fs_info->avail_system_alloc_bits | | |
777 | root->fs_info->avail_metadata_alloc_bits; | |
778 | ||
779 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && | |
dfe25020 | 780 | btrfs_super_num_devices(&root->fs_info->super_copy) <= 4) { |
a061fc8d CM |
781 | printk("btrfs: unable to go below four devices on raid10\n"); |
782 | ret = -EINVAL; | |
783 | goto out; | |
784 | } | |
785 | ||
786 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && | |
dfe25020 | 787 | btrfs_super_num_devices(&root->fs_info->super_copy) <= 2) { |
a061fc8d CM |
788 | printk("btrfs: unable to go below two devices on raid1\n"); |
789 | ret = -EINVAL; | |
790 | goto out; | |
791 | } | |
792 | ||
dfe25020 CM |
793 | if (strcmp(device_path, "missing") == 0) { |
794 | struct list_head *cur; | |
795 | struct list_head *devices; | |
796 | struct btrfs_device *tmp; | |
a061fc8d | 797 | |
dfe25020 CM |
798 | device = NULL; |
799 | devices = &root->fs_info->fs_devices->devices; | |
800 | list_for_each(cur, devices) { | |
801 | tmp = list_entry(cur, struct btrfs_device, dev_list); | |
802 | if (tmp->in_fs_metadata && !tmp->bdev) { | |
803 | device = tmp; | |
804 | break; | |
805 | } | |
806 | } | |
807 | bdev = NULL; | |
808 | bh = NULL; | |
809 | disk_super = NULL; | |
810 | if (!device) { | |
811 | printk("btrfs: no missing devices found to remove\n"); | |
812 | goto out; | |
813 | } | |
814 | ||
815 | } else { | |
816 | bdev = open_bdev_excl(device_path, 0, | |
817 | root->fs_info->bdev_holder); | |
818 | if (IS_ERR(bdev)) { | |
819 | ret = PTR_ERR(bdev); | |
820 | goto out; | |
821 | } | |
a061fc8d | 822 | |
dfe25020 CM |
823 | bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096); |
824 | if (!bh) { | |
825 | ret = -EIO; | |
826 | goto error_close; | |
827 | } | |
828 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
829 | if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, | |
830 | sizeof(disk_super->magic))) { | |
831 | ret = -ENOENT; | |
832 | goto error_brelse; | |
833 | } | |
834 | if (memcmp(disk_super->fsid, root->fs_info->fsid, | |
835 | BTRFS_FSID_SIZE)) { | |
836 | ret = -ENOENT; | |
837 | goto error_brelse; | |
838 | } | |
839 | devid = le64_to_cpu(disk_super->dev_item.devid); | |
840 | device = btrfs_find_device(root, devid, NULL); | |
841 | if (!device) { | |
842 | ret = -ENOENT; | |
843 | goto error_brelse; | |
844 | } | |
845 | ||
846 | } | |
a061fc8d | 847 | root->fs_info->fs_devices->num_devices--; |
0ef3e66b | 848 | root->fs_info->fs_devices->open_devices--; |
a061fc8d CM |
849 | |
850 | ret = btrfs_shrink_device(device, 0); | |
851 | if (ret) | |
852 | goto error_brelse; | |
853 | ||
854 | ||
855 | ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device); | |
856 | if (ret) | |
857 | goto error_brelse; | |
858 | ||
dfe25020 CM |
859 | if (bh) { |
860 | /* make sure this device isn't detected as part of | |
861 | * the FS anymore | |
862 | */ | |
863 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
864 | set_buffer_dirty(bh); | |
865 | sync_dirty_buffer(bh); | |
a061fc8d | 866 | |
dfe25020 CM |
867 | brelse(bh); |
868 | } | |
a061fc8d | 869 | |
dfe25020 CM |
870 | if (device->bdev) { |
871 | /* one close for the device struct or super_block */ | |
872 | close_bdev_excl(device->bdev); | |
873 | } | |
874 | if (bdev) { | |
875 | /* one close for us */ | |
876 | close_bdev_excl(bdev); | |
877 | } | |
a061fc8d CM |
878 | kfree(device->name); |
879 | kfree(device); | |
880 | ret = 0; | |
881 | goto out; | |
882 | ||
883 | error_brelse: | |
884 | brelse(bh); | |
885 | error_close: | |
dfe25020 CM |
886 | if (bdev) |
887 | close_bdev_excl(bdev); | |
a061fc8d CM |
888 | out: |
889 | mutex_unlock(&uuid_mutex); | |
890 | mutex_unlock(&root->fs_info->fs_mutex); | |
891 | return ret; | |
892 | } | |
893 | ||
788f20eb CM |
894 | int btrfs_init_new_device(struct btrfs_root *root, char *device_path) |
895 | { | |
896 | struct btrfs_trans_handle *trans; | |
897 | struct btrfs_device *device; | |
898 | struct block_device *bdev; | |
899 | struct list_head *cur; | |
900 | struct list_head *devices; | |
901 | u64 total_bytes; | |
902 | int ret = 0; | |
903 | ||
904 | ||
905 | bdev = open_bdev_excl(device_path, 0, root->fs_info->bdev_holder); | |
906 | if (!bdev) { | |
907 | return -EIO; | |
908 | } | |
909 | mutex_lock(&root->fs_info->fs_mutex); | |
910 | trans = btrfs_start_transaction(root, 1); | |
911 | devices = &root->fs_info->fs_devices->devices; | |
912 | list_for_each(cur, devices) { | |
913 | device = list_entry(cur, struct btrfs_device, dev_list); | |
914 | if (device->bdev == bdev) { | |
915 | ret = -EEXIST; | |
916 | goto out; | |
917 | } | |
918 | } | |
919 | ||
920 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
921 | if (!device) { | |
922 | /* we can safely leave the fs_devices entry around */ | |
923 | ret = -ENOMEM; | |
924 | goto out_close_bdev; | |
925 | } | |
926 | ||
927 | device->barriers = 1; | |
928 | generate_random_uuid(device->uuid); | |
929 | spin_lock_init(&device->io_lock); | |
930 | device->name = kstrdup(device_path, GFP_NOFS); | |
931 | if (!device->name) { | |
932 | kfree(device); | |
933 | goto out_close_bdev; | |
934 | } | |
935 | device->io_width = root->sectorsize; | |
936 | device->io_align = root->sectorsize; | |
937 | device->sector_size = root->sectorsize; | |
938 | device->total_bytes = i_size_read(bdev->bd_inode); | |
939 | device->dev_root = root->fs_info->dev_root; | |
940 | device->bdev = bdev; | |
dfe25020 | 941 | device->in_fs_metadata = 1; |
788f20eb CM |
942 | |
943 | ret = btrfs_add_device(trans, root, device); | |
944 | if (ret) | |
945 | goto out_close_bdev; | |
946 | ||
947 | total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
948 | btrfs_set_super_total_bytes(&root->fs_info->super_copy, | |
949 | total_bytes + device->total_bytes); | |
950 | ||
951 | total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy); | |
952 | btrfs_set_super_num_devices(&root->fs_info->super_copy, | |
953 | total_bytes + 1); | |
954 | ||
955 | list_add(&device->dev_list, &root->fs_info->fs_devices->devices); | |
956 | list_add(&device->dev_alloc_list, | |
957 | &root->fs_info->fs_devices->alloc_list); | |
958 | root->fs_info->fs_devices->num_devices++; | |
a0af469b | 959 | root->fs_info->fs_devices->open_devices++; |
788f20eb CM |
960 | out: |
961 | btrfs_end_transaction(trans, root); | |
962 | mutex_unlock(&root->fs_info->fs_mutex); | |
963 | return ret; | |
964 | ||
965 | out_close_bdev: | |
966 | close_bdev_excl(bdev); | |
967 | goto out; | |
968 | } | |
969 | ||
0b86a832 CM |
970 | int btrfs_update_device(struct btrfs_trans_handle *trans, |
971 | struct btrfs_device *device) | |
972 | { | |
973 | int ret; | |
974 | struct btrfs_path *path; | |
975 | struct btrfs_root *root; | |
976 | struct btrfs_dev_item *dev_item; | |
977 | struct extent_buffer *leaf; | |
978 | struct btrfs_key key; | |
979 | ||
980 | root = device->dev_root->fs_info->chunk_root; | |
981 | ||
982 | path = btrfs_alloc_path(); | |
983 | if (!path) | |
984 | return -ENOMEM; | |
985 | ||
986 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
987 | key.type = BTRFS_DEV_ITEM_KEY; | |
988 | key.offset = device->devid; | |
989 | ||
990 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
991 | if (ret < 0) | |
992 | goto out; | |
993 | ||
994 | if (ret > 0) { | |
995 | ret = -ENOENT; | |
996 | goto out; | |
997 | } | |
998 | ||
999 | leaf = path->nodes[0]; | |
1000 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1001 | ||
1002 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
1003 | btrfs_set_device_type(leaf, dev_item, device->type); | |
1004 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1005 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1006 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
0b86a832 CM |
1007 | btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); |
1008 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); | |
1009 | btrfs_mark_buffer_dirty(leaf); | |
1010 | ||
1011 | out: | |
1012 | btrfs_free_path(path); | |
1013 | return ret; | |
1014 | } | |
1015 | ||
8f18cf13 CM |
1016 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
1017 | struct btrfs_device *device, u64 new_size) | |
1018 | { | |
1019 | struct btrfs_super_block *super_copy = | |
1020 | &device->dev_root->fs_info->super_copy; | |
1021 | u64 old_total = btrfs_super_total_bytes(super_copy); | |
1022 | u64 diff = new_size - device->total_bytes; | |
1023 | ||
1024 | btrfs_set_super_total_bytes(super_copy, old_total + diff); | |
1025 | return btrfs_update_device(trans, device); | |
1026 | } | |
1027 | ||
1028 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, | |
1029 | struct btrfs_root *root, | |
1030 | u64 chunk_tree, u64 chunk_objectid, | |
1031 | u64 chunk_offset) | |
1032 | { | |
1033 | int ret; | |
1034 | struct btrfs_path *path; | |
1035 | struct btrfs_key key; | |
1036 | ||
1037 | root = root->fs_info->chunk_root; | |
1038 | path = btrfs_alloc_path(); | |
1039 | if (!path) | |
1040 | return -ENOMEM; | |
1041 | ||
1042 | key.objectid = chunk_objectid; | |
1043 | key.offset = chunk_offset; | |
1044 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1045 | ||
1046 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1047 | BUG_ON(ret); | |
1048 | ||
1049 | ret = btrfs_del_item(trans, root, path); | |
1050 | BUG_ON(ret); | |
1051 | ||
1052 | btrfs_free_path(path); | |
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 | |
1057 | chunk_offset) | |
1058 | { | |
1059 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
1060 | struct btrfs_disk_key *disk_key; | |
1061 | struct btrfs_chunk *chunk; | |
1062 | u8 *ptr; | |
1063 | int ret = 0; | |
1064 | u32 num_stripes; | |
1065 | u32 array_size; | |
1066 | u32 len = 0; | |
1067 | u32 cur; | |
1068 | struct btrfs_key key; | |
1069 | ||
1070 | array_size = btrfs_super_sys_array_size(super_copy); | |
1071 | ||
1072 | ptr = super_copy->sys_chunk_array; | |
1073 | cur = 0; | |
1074 | ||
1075 | while (cur < array_size) { | |
1076 | disk_key = (struct btrfs_disk_key *)ptr; | |
1077 | btrfs_disk_key_to_cpu(&key, disk_key); | |
1078 | ||
1079 | len = sizeof(*disk_key); | |
1080 | ||
1081 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { | |
1082 | chunk = (struct btrfs_chunk *)(ptr + len); | |
1083 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); | |
1084 | len += btrfs_chunk_item_size(num_stripes); | |
1085 | } else { | |
1086 | ret = -EIO; | |
1087 | break; | |
1088 | } | |
1089 | if (key.objectid == chunk_objectid && | |
1090 | key.offset == chunk_offset) { | |
1091 | memmove(ptr, ptr + len, array_size - (cur + len)); | |
1092 | array_size -= len; | |
1093 | btrfs_set_super_sys_array_size(super_copy, array_size); | |
1094 | } else { | |
1095 | ptr += len; | |
1096 | cur += len; | |
1097 | } | |
1098 | } | |
1099 | return ret; | |
1100 | } | |
1101 | ||
1102 | ||
1103 | int btrfs_relocate_chunk(struct btrfs_root *root, | |
1104 | u64 chunk_tree, u64 chunk_objectid, | |
1105 | u64 chunk_offset) | |
1106 | { | |
1107 | struct extent_map_tree *em_tree; | |
1108 | struct btrfs_root *extent_root; | |
1109 | struct btrfs_trans_handle *trans; | |
1110 | struct extent_map *em; | |
1111 | struct map_lookup *map; | |
1112 | int ret; | |
1113 | int i; | |
1114 | ||
323da79c CM |
1115 | printk("btrfs relocating chunk %llu\n", |
1116 | (unsigned long long)chunk_offset); | |
8f18cf13 CM |
1117 | root = root->fs_info->chunk_root; |
1118 | extent_root = root->fs_info->extent_root; | |
1119 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
1120 | ||
1121 | /* step one, relocate all the extents inside this chunk */ | |
1122 | ret = btrfs_shrink_extent_tree(extent_root, chunk_offset); | |
1123 | BUG_ON(ret); | |
1124 | ||
1125 | trans = btrfs_start_transaction(root, 1); | |
1126 | BUG_ON(!trans); | |
1127 | ||
1128 | /* | |
1129 | * step two, delete the device extents and the | |
1130 | * chunk tree entries | |
1131 | */ | |
1132 | spin_lock(&em_tree->lock); | |
1133 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); | |
1134 | spin_unlock(&em_tree->lock); | |
1135 | ||
a061fc8d CM |
1136 | BUG_ON(em->start > chunk_offset || |
1137 | em->start + em->len < chunk_offset); | |
8f18cf13 CM |
1138 | map = (struct map_lookup *)em->bdev; |
1139 | ||
1140 | for (i = 0; i < map->num_stripes; i++) { | |
1141 | ret = btrfs_free_dev_extent(trans, map->stripes[i].dev, | |
1142 | map->stripes[i].physical); | |
1143 | BUG_ON(ret); | |
a061fc8d | 1144 | |
dfe25020 CM |
1145 | if (map->stripes[i].dev) { |
1146 | ret = btrfs_update_device(trans, map->stripes[i].dev); | |
1147 | BUG_ON(ret); | |
1148 | } | |
8f18cf13 CM |
1149 | } |
1150 | ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid, | |
1151 | chunk_offset); | |
1152 | ||
1153 | BUG_ON(ret); | |
1154 | ||
1155 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { | |
1156 | ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); | |
1157 | BUG_ON(ret); | |
8f18cf13 CM |
1158 | } |
1159 | ||
8f18cf13 CM |
1160 | spin_lock(&em_tree->lock); |
1161 | remove_extent_mapping(em_tree, em); | |
1162 | kfree(map); | |
1163 | em->bdev = NULL; | |
1164 | ||
1165 | /* once for the tree */ | |
1166 | free_extent_map(em); | |
1167 | spin_unlock(&em_tree->lock); | |
1168 | ||
8f18cf13 CM |
1169 | /* once for us */ |
1170 | free_extent_map(em); | |
1171 | ||
1172 | btrfs_end_transaction(trans, root); | |
1173 | return 0; | |
1174 | } | |
1175 | ||
ec44a35c CM |
1176 | static u64 div_factor(u64 num, int factor) |
1177 | { | |
1178 | if (factor == 10) | |
1179 | return num; | |
1180 | num *= factor; | |
1181 | do_div(num, 10); | |
1182 | return num; | |
1183 | } | |
1184 | ||
1185 | ||
1186 | int btrfs_balance(struct btrfs_root *dev_root) | |
1187 | { | |
1188 | int ret; | |
1189 | struct list_head *cur; | |
1190 | struct list_head *devices = &dev_root->fs_info->fs_devices->devices; | |
1191 | struct btrfs_device *device; | |
1192 | u64 old_size; | |
1193 | u64 size_to_free; | |
1194 | struct btrfs_path *path; | |
1195 | struct btrfs_key key; | |
1196 | struct btrfs_chunk *chunk; | |
1197 | struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root; | |
1198 | struct btrfs_trans_handle *trans; | |
1199 | struct btrfs_key found_key; | |
1200 | ||
1201 | ||
1202 | dev_root = dev_root->fs_info->dev_root; | |
1203 | ||
1204 | mutex_lock(&dev_root->fs_info->fs_mutex); | |
1205 | /* step one make some room on all the devices */ | |
1206 | list_for_each(cur, devices) { | |
1207 | device = list_entry(cur, struct btrfs_device, dev_list); | |
1208 | old_size = device->total_bytes; | |
1209 | size_to_free = div_factor(old_size, 1); | |
1210 | size_to_free = min(size_to_free, (u64)1 * 1024 * 1024); | |
1211 | if (device->total_bytes - device->bytes_used > size_to_free) | |
1212 | continue; | |
1213 | ||
1214 | ret = btrfs_shrink_device(device, old_size - size_to_free); | |
1215 | BUG_ON(ret); | |
1216 | ||
1217 | trans = btrfs_start_transaction(dev_root, 1); | |
1218 | BUG_ON(!trans); | |
1219 | ||
1220 | ret = btrfs_grow_device(trans, device, old_size); | |
1221 | BUG_ON(ret); | |
1222 | ||
1223 | btrfs_end_transaction(trans, dev_root); | |
1224 | } | |
1225 | ||
1226 | /* step two, relocate all the chunks */ | |
1227 | path = btrfs_alloc_path(); | |
1228 | BUG_ON(!path); | |
1229 | ||
1230 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; | |
1231 | key.offset = (u64)-1; | |
1232 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1233 | ||
1234 | while(1) { | |
1235 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); | |
1236 | if (ret < 0) | |
1237 | goto error; | |
1238 | ||
1239 | /* | |
1240 | * this shouldn't happen, it means the last relocate | |
1241 | * failed | |
1242 | */ | |
1243 | if (ret == 0) | |
1244 | break; | |
1245 | ||
1246 | ret = btrfs_previous_item(chunk_root, path, 0, | |
1247 | BTRFS_CHUNK_ITEM_KEY); | |
1248 | if (ret) { | |
1249 | break; | |
1250 | } | |
1251 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1252 | path->slots[0]); | |
1253 | if (found_key.objectid != key.objectid) | |
1254 | break; | |
1255 | chunk = btrfs_item_ptr(path->nodes[0], | |
1256 | path->slots[0], | |
1257 | struct btrfs_chunk); | |
1258 | key.offset = found_key.offset; | |
1259 | /* chunk zero is special */ | |
1260 | if (key.offset == 0) | |
1261 | break; | |
1262 | ||
1263 | ret = btrfs_relocate_chunk(chunk_root, | |
1264 | chunk_root->root_key.objectid, | |
1265 | found_key.objectid, | |
1266 | found_key.offset); | |
1267 | BUG_ON(ret); | |
1268 | btrfs_release_path(chunk_root, path); | |
1269 | } | |
1270 | ret = 0; | |
1271 | error: | |
1272 | btrfs_free_path(path); | |
1273 | mutex_unlock(&dev_root->fs_info->fs_mutex); | |
1274 | return ret; | |
1275 | } | |
1276 | ||
8f18cf13 CM |
1277 | /* |
1278 | * shrinking a device means finding all of the device extents past | |
1279 | * the new size, and then following the back refs to the chunks. | |
1280 | * The chunk relocation code actually frees the device extent | |
1281 | */ | |
1282 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) | |
1283 | { | |
1284 | struct btrfs_trans_handle *trans; | |
1285 | struct btrfs_root *root = device->dev_root; | |
1286 | struct btrfs_dev_extent *dev_extent = NULL; | |
1287 | struct btrfs_path *path; | |
1288 | u64 length; | |
1289 | u64 chunk_tree; | |
1290 | u64 chunk_objectid; | |
1291 | u64 chunk_offset; | |
1292 | int ret; | |
1293 | int slot; | |
1294 | struct extent_buffer *l; | |
1295 | struct btrfs_key key; | |
1296 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
1297 | u64 old_total = btrfs_super_total_bytes(super_copy); | |
1298 | u64 diff = device->total_bytes - new_size; | |
1299 | ||
1300 | ||
1301 | path = btrfs_alloc_path(); | |
1302 | if (!path) | |
1303 | return -ENOMEM; | |
1304 | ||
1305 | trans = btrfs_start_transaction(root, 1); | |
1306 | if (!trans) { | |
1307 | ret = -ENOMEM; | |
1308 | goto done; | |
1309 | } | |
1310 | ||
1311 | path->reada = 2; | |
1312 | ||
1313 | device->total_bytes = new_size; | |
1314 | ret = btrfs_update_device(trans, device); | |
1315 | if (ret) { | |
1316 | btrfs_end_transaction(trans, root); | |
1317 | goto done; | |
1318 | } | |
1319 | WARN_ON(diff > old_total); | |
1320 | btrfs_set_super_total_bytes(super_copy, old_total - diff); | |
1321 | btrfs_end_transaction(trans, root); | |
1322 | ||
1323 | key.objectid = device->devid; | |
1324 | key.offset = (u64)-1; | |
1325 | key.type = BTRFS_DEV_EXTENT_KEY; | |
1326 | ||
1327 | while (1) { | |
1328 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1329 | if (ret < 0) | |
1330 | goto done; | |
1331 | ||
1332 | ret = btrfs_previous_item(root, path, 0, key.type); | |
1333 | if (ret < 0) | |
1334 | goto done; | |
1335 | if (ret) { | |
1336 | ret = 0; | |
1337 | goto done; | |
1338 | } | |
1339 | ||
1340 | l = path->nodes[0]; | |
1341 | slot = path->slots[0]; | |
1342 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
1343 | ||
1344 | if (key.objectid != device->devid) | |
1345 | goto done; | |
1346 | ||
1347 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
1348 | length = btrfs_dev_extent_length(l, dev_extent); | |
1349 | ||
1350 | if (key.offset + length <= new_size) | |
1351 | goto done; | |
1352 | ||
1353 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
1354 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
1355 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
1356 | btrfs_release_path(root, path); | |
1357 | ||
1358 | ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid, | |
1359 | chunk_offset); | |
1360 | if (ret) | |
1361 | goto done; | |
1362 | } | |
1363 | ||
1364 | done: | |
1365 | btrfs_free_path(path); | |
1366 | return ret; | |
1367 | } | |
1368 | ||
0b86a832 CM |
1369 | int btrfs_add_system_chunk(struct btrfs_trans_handle *trans, |
1370 | struct btrfs_root *root, | |
1371 | struct btrfs_key *key, | |
1372 | struct btrfs_chunk *chunk, int item_size) | |
1373 | { | |
1374 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
1375 | struct btrfs_disk_key disk_key; | |
1376 | u32 array_size; | |
1377 | u8 *ptr; | |
1378 | ||
1379 | array_size = btrfs_super_sys_array_size(super_copy); | |
1380 | if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) | |
1381 | return -EFBIG; | |
1382 | ||
1383 | ptr = super_copy->sys_chunk_array + array_size; | |
1384 | btrfs_cpu_key_to_disk(&disk_key, key); | |
1385 | memcpy(ptr, &disk_key, sizeof(disk_key)); | |
1386 | ptr += sizeof(disk_key); | |
1387 | memcpy(ptr, chunk, item_size); | |
1388 | item_size += sizeof(disk_key); | |
1389 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); | |
1390 | return 0; | |
1391 | } | |
1392 | ||
9b3f68b9 CM |
1393 | static u64 chunk_bytes_by_type(u64 type, u64 calc_size, int num_stripes, |
1394 | int sub_stripes) | |
1395 | { | |
1396 | if (type & (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP)) | |
1397 | return calc_size; | |
1398 | else if (type & BTRFS_BLOCK_GROUP_RAID10) | |
1399 | return calc_size * (num_stripes / sub_stripes); | |
1400 | else | |
1401 | return calc_size * num_stripes; | |
1402 | } | |
1403 | ||
1404 | ||
0b86a832 CM |
1405 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
1406 | struct btrfs_root *extent_root, u64 *start, | |
6324fbf3 | 1407 | u64 *num_bytes, u64 type) |
0b86a832 CM |
1408 | { |
1409 | u64 dev_offset; | |
593060d7 | 1410 | struct btrfs_fs_info *info = extent_root->fs_info; |
0b86a832 | 1411 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; |
8f18cf13 | 1412 | struct btrfs_path *path; |
0b86a832 CM |
1413 | struct btrfs_stripe *stripes; |
1414 | struct btrfs_device *device = NULL; | |
1415 | struct btrfs_chunk *chunk; | |
6324fbf3 | 1416 | struct list_head private_devs; |
b3075717 | 1417 | struct list_head *dev_list; |
6324fbf3 | 1418 | struct list_head *cur; |
0b86a832 CM |
1419 | struct extent_map_tree *em_tree; |
1420 | struct map_lookup *map; | |
1421 | struct extent_map *em; | |
a40a90a0 | 1422 | int min_stripe_size = 1 * 1024 * 1024; |
0b86a832 CM |
1423 | u64 physical; |
1424 | u64 calc_size = 1024 * 1024 * 1024; | |
9b3f68b9 CM |
1425 | u64 max_chunk_size = calc_size; |
1426 | u64 min_free; | |
6324fbf3 CM |
1427 | u64 avail; |
1428 | u64 max_avail = 0; | |
9b3f68b9 | 1429 | u64 percent_max; |
6324fbf3 | 1430 | int num_stripes = 1; |
a40a90a0 | 1431 | int min_stripes = 1; |
321aecc6 | 1432 | int sub_stripes = 0; |
6324fbf3 | 1433 | int looped = 0; |
0b86a832 | 1434 | int ret; |
6324fbf3 | 1435 | int index; |
593060d7 | 1436 | int stripe_len = 64 * 1024; |
0b86a832 CM |
1437 | struct btrfs_key key; |
1438 | ||
ec44a35c CM |
1439 | if ((type & BTRFS_BLOCK_GROUP_RAID1) && |
1440 | (type & BTRFS_BLOCK_GROUP_DUP)) { | |
1441 | WARN_ON(1); | |
1442 | type &= ~BTRFS_BLOCK_GROUP_DUP; | |
1443 | } | |
b3075717 | 1444 | dev_list = &extent_root->fs_info->fs_devices->alloc_list; |
6324fbf3 CM |
1445 | if (list_empty(dev_list)) |
1446 | return -ENOSPC; | |
593060d7 | 1447 | |
a40a90a0 | 1448 | if (type & (BTRFS_BLOCK_GROUP_RAID0)) { |
0ef3e66b | 1449 | num_stripes = extent_root->fs_info->fs_devices->open_devices; |
a40a90a0 CM |
1450 | min_stripes = 2; |
1451 | } | |
1452 | if (type & (BTRFS_BLOCK_GROUP_DUP)) { | |
611f0e00 | 1453 | num_stripes = 2; |
a40a90a0 CM |
1454 | min_stripes = 2; |
1455 | } | |
8790d502 CM |
1456 | if (type & (BTRFS_BLOCK_GROUP_RAID1)) { |
1457 | num_stripes = min_t(u64, 2, | |
0ef3e66b | 1458 | extent_root->fs_info->fs_devices->open_devices); |
9b3f68b9 CM |
1459 | if (num_stripes < 2) |
1460 | return -ENOSPC; | |
a40a90a0 | 1461 | min_stripes = 2; |
8790d502 | 1462 | } |
321aecc6 | 1463 | if (type & (BTRFS_BLOCK_GROUP_RAID10)) { |
0ef3e66b | 1464 | num_stripes = extent_root->fs_info->fs_devices->open_devices; |
321aecc6 CM |
1465 | if (num_stripes < 4) |
1466 | return -ENOSPC; | |
1467 | num_stripes &= ~(u32)1; | |
1468 | sub_stripes = 2; | |
a40a90a0 | 1469 | min_stripes = 4; |
321aecc6 | 1470 | } |
9b3f68b9 CM |
1471 | |
1472 | if (type & BTRFS_BLOCK_GROUP_DATA) { | |
1473 | max_chunk_size = 10 * calc_size; | |
a40a90a0 | 1474 | min_stripe_size = 64 * 1024 * 1024; |
9b3f68b9 CM |
1475 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
1476 | max_chunk_size = 4 * calc_size; | |
a40a90a0 CM |
1477 | min_stripe_size = 32 * 1024 * 1024; |
1478 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { | |
1479 | calc_size = 8 * 1024 * 1024; | |
1480 | max_chunk_size = calc_size * 2; | |
1481 | min_stripe_size = 1 * 1024 * 1024; | |
9b3f68b9 CM |
1482 | } |
1483 | ||
8f18cf13 CM |
1484 | path = btrfs_alloc_path(); |
1485 | if (!path) | |
1486 | return -ENOMEM; | |
1487 | ||
9b3f68b9 CM |
1488 | /* we don't want a chunk larger than 10% of the FS */ |
1489 | percent_max = div_factor(btrfs_super_total_bytes(&info->super_copy), 1); | |
1490 | max_chunk_size = min(percent_max, max_chunk_size); | |
1491 | ||
a40a90a0 | 1492 | again: |
9b3f68b9 CM |
1493 | if (calc_size * num_stripes > max_chunk_size) { |
1494 | calc_size = max_chunk_size; | |
1495 | do_div(calc_size, num_stripes); | |
1496 | do_div(calc_size, stripe_len); | |
1497 | calc_size *= stripe_len; | |
1498 | } | |
1499 | /* we don't want tiny stripes */ | |
a40a90a0 | 1500 | calc_size = max_t(u64, min_stripe_size, calc_size); |
9b3f68b9 | 1501 | |
9b3f68b9 CM |
1502 | do_div(calc_size, stripe_len); |
1503 | calc_size *= stripe_len; | |
1504 | ||
6324fbf3 CM |
1505 | INIT_LIST_HEAD(&private_devs); |
1506 | cur = dev_list->next; | |
1507 | index = 0; | |
611f0e00 CM |
1508 | |
1509 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
1510 | min_free = calc_size * 2; | |
9b3f68b9 CM |
1511 | else |
1512 | min_free = calc_size; | |
611f0e00 | 1513 | |
ad5bd91e CM |
1514 | /* we add 1MB because we never use the first 1MB of the device */ |
1515 | min_free += 1024 * 1024; | |
1516 | ||
6324fbf3 CM |
1517 | /* build a private list of devices we will allocate from */ |
1518 | while(index < num_stripes) { | |
b3075717 | 1519 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
611f0e00 | 1520 | |
dfe25020 CM |
1521 | if (device->total_bytes > device->bytes_used) |
1522 | avail = device->total_bytes - device->bytes_used; | |
1523 | else | |
1524 | avail = 0; | |
6324fbf3 | 1525 | cur = cur->next; |
8f18cf13 | 1526 | |
dfe25020 | 1527 | if (device->in_fs_metadata && avail >= min_free) { |
8f18cf13 CM |
1528 | u64 ignored_start = 0; |
1529 | ret = find_free_dev_extent(trans, device, path, | |
1530 | min_free, | |
1531 | &ignored_start); | |
1532 | if (ret == 0) { | |
1533 | list_move_tail(&device->dev_alloc_list, | |
1534 | &private_devs); | |
611f0e00 | 1535 | index++; |
8f18cf13 CM |
1536 | if (type & BTRFS_BLOCK_GROUP_DUP) |
1537 | index++; | |
1538 | } | |
dfe25020 | 1539 | } else if (device->in_fs_metadata && avail > max_avail) |
a40a90a0 | 1540 | max_avail = avail; |
6324fbf3 CM |
1541 | if (cur == dev_list) |
1542 | break; | |
1543 | } | |
1544 | if (index < num_stripes) { | |
1545 | list_splice(&private_devs, dev_list); | |
a40a90a0 CM |
1546 | if (index >= min_stripes) { |
1547 | num_stripes = index; | |
1548 | if (type & (BTRFS_BLOCK_GROUP_RAID10)) { | |
1549 | num_stripes /= sub_stripes; | |
1550 | num_stripes *= sub_stripes; | |
1551 | } | |
1552 | looped = 1; | |
1553 | goto again; | |
1554 | } | |
6324fbf3 CM |
1555 | if (!looped && max_avail > 0) { |
1556 | looped = 1; | |
1557 | calc_size = max_avail; | |
1558 | goto again; | |
1559 | } | |
8f18cf13 | 1560 | btrfs_free_path(path); |
6324fbf3 CM |
1561 | return -ENOSPC; |
1562 | } | |
e17cade2 CM |
1563 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
1564 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1565 | ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
1566 | &key.offset); | |
8f18cf13 CM |
1567 | if (ret) { |
1568 | btrfs_free_path(path); | |
0b86a832 | 1569 | return ret; |
8f18cf13 | 1570 | } |
0b86a832 | 1571 | |
0b86a832 | 1572 | chunk = kmalloc(btrfs_chunk_item_size(num_stripes), GFP_NOFS); |
8f18cf13 CM |
1573 | if (!chunk) { |
1574 | btrfs_free_path(path); | |
0b86a832 | 1575 | return -ENOMEM; |
8f18cf13 | 1576 | } |
0b86a832 | 1577 | |
593060d7 CM |
1578 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); |
1579 | if (!map) { | |
1580 | kfree(chunk); | |
8f18cf13 | 1581 | btrfs_free_path(path); |
593060d7 CM |
1582 | return -ENOMEM; |
1583 | } | |
8f18cf13 CM |
1584 | btrfs_free_path(path); |
1585 | path = NULL; | |
593060d7 | 1586 | |
0b86a832 | 1587 | stripes = &chunk->stripe; |
9b3f68b9 CM |
1588 | *num_bytes = chunk_bytes_by_type(type, calc_size, |
1589 | num_stripes, sub_stripes); | |
0b86a832 | 1590 | |
6324fbf3 | 1591 | index = 0; |
0b86a832 | 1592 | while(index < num_stripes) { |
e17cade2 | 1593 | struct btrfs_stripe *stripe; |
6324fbf3 CM |
1594 | BUG_ON(list_empty(&private_devs)); |
1595 | cur = private_devs.next; | |
b3075717 | 1596 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
611f0e00 CM |
1597 | |
1598 | /* loop over this device again if we're doing a dup group */ | |
1599 | if (!(type & BTRFS_BLOCK_GROUP_DUP) || | |
1600 | (index == num_stripes - 1)) | |
b3075717 | 1601 | list_move_tail(&device->dev_alloc_list, dev_list); |
0b86a832 CM |
1602 | |
1603 | ret = btrfs_alloc_dev_extent(trans, device, | |
e17cade2 CM |
1604 | info->chunk_root->root_key.objectid, |
1605 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, key.offset, | |
1606 | calc_size, &dev_offset); | |
0b86a832 | 1607 | BUG_ON(ret); |
0b86a832 CM |
1608 | device->bytes_used += calc_size; |
1609 | ret = btrfs_update_device(trans, device); | |
1610 | BUG_ON(ret); | |
1611 | ||
593060d7 CM |
1612 | map->stripes[index].dev = device; |
1613 | map->stripes[index].physical = dev_offset; | |
e17cade2 CM |
1614 | stripe = stripes + index; |
1615 | btrfs_set_stack_stripe_devid(stripe, device->devid); | |
1616 | btrfs_set_stack_stripe_offset(stripe, dev_offset); | |
1617 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); | |
0b86a832 CM |
1618 | physical = dev_offset; |
1619 | index++; | |
1620 | } | |
6324fbf3 | 1621 | BUG_ON(!list_empty(&private_devs)); |
0b86a832 | 1622 | |
e17cade2 CM |
1623 | /* key was set above */ |
1624 | btrfs_set_stack_chunk_length(chunk, *num_bytes); | |
0b86a832 | 1625 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
593060d7 | 1626 | btrfs_set_stack_chunk_stripe_len(chunk, stripe_len); |
0b86a832 CM |
1627 | btrfs_set_stack_chunk_type(chunk, type); |
1628 | btrfs_set_stack_chunk_num_stripes(chunk, num_stripes); | |
593060d7 CM |
1629 | btrfs_set_stack_chunk_io_align(chunk, stripe_len); |
1630 | btrfs_set_stack_chunk_io_width(chunk, stripe_len); | |
0b86a832 | 1631 | btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize); |
321aecc6 | 1632 | btrfs_set_stack_chunk_sub_stripes(chunk, sub_stripes); |
593060d7 CM |
1633 | map->sector_size = extent_root->sectorsize; |
1634 | map->stripe_len = stripe_len; | |
1635 | map->io_align = stripe_len; | |
1636 | map->io_width = stripe_len; | |
1637 | map->type = type; | |
1638 | map->num_stripes = num_stripes; | |
321aecc6 | 1639 | map->sub_stripes = sub_stripes; |
0b86a832 CM |
1640 | |
1641 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, | |
1642 | btrfs_chunk_item_size(num_stripes)); | |
1643 | BUG_ON(ret); | |
e17cade2 | 1644 | *start = key.offset;; |
0b86a832 CM |
1645 | |
1646 | em = alloc_extent_map(GFP_NOFS); | |
1647 | if (!em) | |
1648 | return -ENOMEM; | |
0b86a832 | 1649 | em->bdev = (struct block_device *)map; |
e17cade2 CM |
1650 | em->start = key.offset; |
1651 | em->len = *num_bytes; | |
0b86a832 CM |
1652 | em->block_start = 0; |
1653 | ||
8f18cf13 CM |
1654 | if (type & BTRFS_BLOCK_GROUP_SYSTEM) { |
1655 | ret = btrfs_add_system_chunk(trans, chunk_root, &key, | |
1656 | chunk, btrfs_chunk_item_size(num_stripes)); | |
1657 | BUG_ON(ret); | |
1658 | } | |
0b86a832 CM |
1659 | kfree(chunk); |
1660 | ||
1661 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; | |
1662 | spin_lock(&em_tree->lock); | |
1663 | ret = add_extent_mapping(em_tree, em); | |
0b86a832 | 1664 | spin_unlock(&em_tree->lock); |
b248a415 | 1665 | BUG_ON(ret); |
0b86a832 CM |
1666 | free_extent_map(em); |
1667 | return ret; | |
1668 | } | |
1669 | ||
1670 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) | |
1671 | { | |
1672 | extent_map_tree_init(&tree->map_tree, GFP_NOFS); | |
1673 | } | |
1674 | ||
1675 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) | |
1676 | { | |
1677 | struct extent_map *em; | |
1678 | ||
1679 | while(1) { | |
1680 | spin_lock(&tree->map_tree.lock); | |
1681 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); | |
1682 | if (em) | |
1683 | remove_extent_mapping(&tree->map_tree, em); | |
1684 | spin_unlock(&tree->map_tree.lock); | |
1685 | if (!em) | |
1686 | break; | |
1687 | kfree(em->bdev); | |
1688 | /* once for us */ | |
1689 | free_extent_map(em); | |
1690 | /* once for the tree */ | |
1691 | free_extent_map(em); | |
1692 | } | |
1693 | } | |
1694 | ||
f188591e CM |
1695 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len) |
1696 | { | |
1697 | struct extent_map *em; | |
1698 | struct map_lookup *map; | |
1699 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
1700 | int ret; | |
1701 | ||
1702 | spin_lock(&em_tree->lock); | |
1703 | em = lookup_extent_mapping(em_tree, logical, len); | |
b248a415 | 1704 | spin_unlock(&em_tree->lock); |
f188591e CM |
1705 | BUG_ON(!em); |
1706 | ||
1707 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
1708 | map = (struct map_lookup *)em->bdev; | |
1709 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) | |
1710 | ret = map->num_stripes; | |
321aecc6 CM |
1711 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
1712 | ret = map->sub_stripes; | |
f188591e CM |
1713 | else |
1714 | ret = 1; | |
1715 | free_extent_map(em); | |
f188591e CM |
1716 | return ret; |
1717 | } | |
1718 | ||
dfe25020 CM |
1719 | static int find_live_mirror(struct map_lookup *map, int first, int num, |
1720 | int optimal) | |
1721 | { | |
1722 | int i; | |
1723 | if (map->stripes[optimal].dev->bdev) | |
1724 | return optimal; | |
1725 | for (i = first; i < first + num; i++) { | |
1726 | if (map->stripes[i].dev->bdev) | |
1727 | return i; | |
1728 | } | |
1729 | /* we couldn't find one that doesn't fail. Just return something | |
1730 | * and the io error handling code will clean up eventually | |
1731 | */ | |
1732 | return optimal; | |
1733 | } | |
1734 | ||
f2d8d74d CM |
1735 | static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
1736 | u64 logical, u64 *length, | |
1737 | struct btrfs_multi_bio **multi_ret, | |
1738 | int mirror_num, struct page *unplug_page) | |
0b86a832 CM |
1739 | { |
1740 | struct extent_map *em; | |
1741 | struct map_lookup *map; | |
1742 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
1743 | u64 offset; | |
593060d7 CM |
1744 | u64 stripe_offset; |
1745 | u64 stripe_nr; | |
cea9e445 | 1746 | int stripes_allocated = 8; |
321aecc6 | 1747 | int stripes_required = 1; |
593060d7 | 1748 | int stripe_index; |
cea9e445 | 1749 | int i; |
f2d8d74d | 1750 | int num_stripes; |
a236aed1 | 1751 | int max_errors = 0; |
cea9e445 | 1752 | struct btrfs_multi_bio *multi = NULL; |
0b86a832 | 1753 | |
cea9e445 CM |
1754 | if (multi_ret && !(rw & (1 << BIO_RW))) { |
1755 | stripes_allocated = 1; | |
1756 | } | |
1757 | again: | |
1758 | if (multi_ret) { | |
1759 | multi = kzalloc(btrfs_multi_bio_size(stripes_allocated), | |
1760 | GFP_NOFS); | |
1761 | if (!multi) | |
1762 | return -ENOMEM; | |
a236aed1 CM |
1763 | |
1764 | atomic_set(&multi->error, 0); | |
cea9e445 | 1765 | } |
0b86a832 CM |
1766 | |
1767 | spin_lock(&em_tree->lock); | |
1768 | em = lookup_extent_mapping(em_tree, logical, *length); | |
b248a415 | 1769 | spin_unlock(&em_tree->lock); |
f2d8d74d CM |
1770 | |
1771 | if (!em && unplug_page) | |
1772 | return 0; | |
1773 | ||
3b951516 | 1774 | if (!em) { |
a061fc8d | 1775 | printk("unable to find logical %Lu len %Lu\n", logical, *length); |
f2d8d74d | 1776 | BUG(); |
3b951516 | 1777 | } |
0b86a832 CM |
1778 | |
1779 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
1780 | map = (struct map_lookup *)em->bdev; | |
1781 | offset = logical - em->start; | |
593060d7 | 1782 | |
f188591e CM |
1783 | if (mirror_num > map->num_stripes) |
1784 | mirror_num = 0; | |
1785 | ||
cea9e445 | 1786 | /* if our multi bio struct is too small, back off and try again */ |
321aecc6 CM |
1787 | if (rw & (1 << BIO_RW)) { |
1788 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | | |
1789 | BTRFS_BLOCK_GROUP_DUP)) { | |
1790 | stripes_required = map->num_stripes; | |
a236aed1 | 1791 | max_errors = 1; |
321aecc6 CM |
1792 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
1793 | stripes_required = map->sub_stripes; | |
a236aed1 | 1794 | max_errors = 1; |
321aecc6 CM |
1795 | } |
1796 | } | |
1797 | if (multi_ret && rw == WRITE && | |
1798 | stripes_allocated < stripes_required) { | |
cea9e445 | 1799 | stripes_allocated = map->num_stripes; |
cea9e445 CM |
1800 | free_extent_map(em); |
1801 | kfree(multi); | |
1802 | goto again; | |
1803 | } | |
593060d7 CM |
1804 | stripe_nr = offset; |
1805 | /* | |
1806 | * stripe_nr counts the total number of stripes we have to stride | |
1807 | * to get to this block | |
1808 | */ | |
1809 | do_div(stripe_nr, map->stripe_len); | |
1810 | ||
1811 | stripe_offset = stripe_nr * map->stripe_len; | |
1812 | BUG_ON(offset < stripe_offset); | |
1813 | ||
1814 | /* stripe_offset is the offset of this block in its stripe*/ | |
1815 | stripe_offset = offset - stripe_offset; | |
1816 | ||
cea9e445 | 1817 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 1818 | BTRFS_BLOCK_GROUP_RAID10 | |
cea9e445 CM |
1819 | BTRFS_BLOCK_GROUP_DUP)) { |
1820 | /* we limit the length of each bio to what fits in a stripe */ | |
1821 | *length = min_t(u64, em->len - offset, | |
1822 | map->stripe_len - stripe_offset); | |
1823 | } else { | |
1824 | *length = em->len - offset; | |
1825 | } | |
f2d8d74d CM |
1826 | |
1827 | if (!multi_ret && !unplug_page) | |
cea9e445 CM |
1828 | goto out; |
1829 | ||
f2d8d74d | 1830 | num_stripes = 1; |
cea9e445 | 1831 | stripe_index = 0; |
8790d502 | 1832 | if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
f2d8d74d CM |
1833 | if (unplug_page || (rw & (1 << BIO_RW))) |
1834 | num_stripes = map->num_stripes; | |
2fff734f | 1835 | else if (mirror_num) |
f188591e | 1836 | stripe_index = mirror_num - 1; |
dfe25020 CM |
1837 | else { |
1838 | stripe_index = find_live_mirror(map, 0, | |
1839 | map->num_stripes, | |
1840 | current->pid % map->num_stripes); | |
1841 | } | |
2fff734f | 1842 | |
611f0e00 | 1843 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
cea9e445 | 1844 | if (rw & (1 << BIO_RW)) |
f2d8d74d | 1845 | num_stripes = map->num_stripes; |
f188591e CM |
1846 | else if (mirror_num) |
1847 | stripe_index = mirror_num - 1; | |
2fff734f | 1848 | |
321aecc6 CM |
1849 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
1850 | int factor = map->num_stripes / map->sub_stripes; | |
321aecc6 CM |
1851 | |
1852 | stripe_index = do_div(stripe_nr, factor); | |
1853 | stripe_index *= map->sub_stripes; | |
1854 | ||
f2d8d74d CM |
1855 | if (unplug_page || (rw & (1 << BIO_RW))) |
1856 | num_stripes = map->sub_stripes; | |
321aecc6 CM |
1857 | else if (mirror_num) |
1858 | stripe_index += mirror_num - 1; | |
dfe25020 CM |
1859 | else { |
1860 | stripe_index = find_live_mirror(map, stripe_index, | |
1861 | map->sub_stripes, stripe_index + | |
1862 | current->pid % map->sub_stripes); | |
1863 | } | |
8790d502 CM |
1864 | } else { |
1865 | /* | |
1866 | * after this do_div call, stripe_nr is the number of stripes | |
1867 | * on this device we have to walk to find the data, and | |
1868 | * stripe_index is the number of our device in the stripe array | |
1869 | */ | |
1870 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
1871 | } | |
593060d7 | 1872 | BUG_ON(stripe_index >= map->num_stripes); |
cea9e445 | 1873 | |
f2d8d74d CM |
1874 | for (i = 0; i < num_stripes; i++) { |
1875 | if (unplug_page) { | |
1876 | struct btrfs_device *device; | |
1877 | struct backing_dev_info *bdi; | |
1878 | ||
1879 | device = map->stripes[stripe_index].dev; | |
dfe25020 CM |
1880 | if (device->bdev) { |
1881 | bdi = blk_get_backing_dev_info(device->bdev); | |
1882 | if (bdi->unplug_io_fn) { | |
1883 | bdi->unplug_io_fn(bdi, unplug_page); | |
1884 | } | |
f2d8d74d CM |
1885 | } |
1886 | } else { | |
1887 | multi->stripes[i].physical = | |
1888 | map->stripes[stripe_index].physical + | |
1889 | stripe_offset + stripe_nr * map->stripe_len; | |
1890 | multi->stripes[i].dev = map->stripes[stripe_index].dev; | |
1891 | } | |
cea9e445 | 1892 | stripe_index++; |
593060d7 | 1893 | } |
f2d8d74d CM |
1894 | if (multi_ret) { |
1895 | *multi_ret = multi; | |
1896 | multi->num_stripes = num_stripes; | |
a236aed1 | 1897 | multi->max_errors = max_errors; |
f2d8d74d | 1898 | } |
cea9e445 | 1899 | out: |
0b86a832 | 1900 | free_extent_map(em); |
0b86a832 CM |
1901 | return 0; |
1902 | } | |
1903 | ||
f2d8d74d CM |
1904 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
1905 | u64 logical, u64 *length, | |
1906 | struct btrfs_multi_bio **multi_ret, int mirror_num) | |
1907 | { | |
1908 | return __btrfs_map_block(map_tree, rw, logical, length, multi_ret, | |
1909 | mirror_num, NULL); | |
1910 | } | |
1911 | ||
1912 | int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, | |
1913 | u64 logical, struct page *page) | |
1914 | { | |
1915 | u64 length = PAGE_CACHE_SIZE; | |
1916 | return __btrfs_map_block(map_tree, READ, logical, &length, | |
1917 | NULL, 0, page); | |
1918 | } | |
1919 | ||
1920 | ||
8790d502 CM |
1921 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
1922 | static void end_bio_multi_stripe(struct bio *bio, int err) | |
1923 | #else | |
1924 | static int end_bio_multi_stripe(struct bio *bio, | |
1925 | unsigned int bytes_done, int err) | |
1926 | #endif | |
1927 | { | |
cea9e445 | 1928 | struct btrfs_multi_bio *multi = bio->bi_private; |
8790d502 CM |
1929 | |
1930 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | |
1931 | if (bio->bi_size) | |
1932 | return 1; | |
1933 | #endif | |
1934 | if (err) | |
a236aed1 | 1935 | atomic_inc(&multi->error); |
8790d502 | 1936 | |
cea9e445 | 1937 | if (atomic_dec_and_test(&multi->stripes_pending)) { |
8790d502 CM |
1938 | bio->bi_private = multi->private; |
1939 | bio->bi_end_io = multi->end_io; | |
a236aed1 CM |
1940 | /* only send an error to the higher layers if it is |
1941 | * beyond the tolerance of the multi-bio | |
1942 | */ | |
1259ab75 | 1943 | if (atomic_read(&multi->error) > multi->max_errors) { |
a236aed1 | 1944 | err = -EIO; |
1259ab75 CM |
1945 | } else if (err) { |
1946 | /* | |
1947 | * this bio is actually up to date, we didn't | |
1948 | * go over the max number of errors | |
1949 | */ | |
1950 | set_bit(BIO_UPTODATE, &bio->bi_flags); | |
a236aed1 | 1951 | err = 0; |
1259ab75 | 1952 | } |
8790d502 CM |
1953 | kfree(multi); |
1954 | ||
73f61b2a M |
1955 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
1956 | bio_endio(bio, bio->bi_size, err); | |
1957 | #else | |
8790d502 | 1958 | bio_endio(bio, err); |
73f61b2a | 1959 | #endif |
8790d502 CM |
1960 | } else { |
1961 | bio_put(bio); | |
1962 | } | |
1963 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | |
1964 | return 0; | |
1965 | #endif | |
1966 | } | |
1967 | ||
f188591e CM |
1968 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
1969 | int mirror_num) | |
0b86a832 CM |
1970 | { |
1971 | struct btrfs_mapping_tree *map_tree; | |
1972 | struct btrfs_device *dev; | |
8790d502 | 1973 | struct bio *first_bio = bio; |
0b86a832 | 1974 | u64 logical = bio->bi_sector << 9; |
0b86a832 CM |
1975 | u64 length = 0; |
1976 | u64 map_length; | |
cea9e445 | 1977 | struct btrfs_multi_bio *multi = NULL; |
0b86a832 | 1978 | int ret; |
8790d502 CM |
1979 | int dev_nr = 0; |
1980 | int total_devs = 1; | |
0b86a832 | 1981 | |
f2d8d74d | 1982 | length = bio->bi_size; |
0b86a832 CM |
1983 | map_tree = &root->fs_info->mapping_tree; |
1984 | map_length = length; | |
cea9e445 | 1985 | |
f188591e CM |
1986 | ret = btrfs_map_block(map_tree, rw, logical, &map_length, &multi, |
1987 | mirror_num); | |
cea9e445 CM |
1988 | BUG_ON(ret); |
1989 | ||
1990 | total_devs = multi->num_stripes; | |
1991 | if (map_length < length) { | |
1992 | printk("mapping failed logical %Lu bio len %Lu " | |
1993 | "len %Lu\n", logical, length, map_length); | |
1994 | BUG(); | |
1995 | } | |
1996 | multi->end_io = first_bio->bi_end_io; | |
1997 | multi->private = first_bio->bi_private; | |
1998 | atomic_set(&multi->stripes_pending, multi->num_stripes); | |
1999 | ||
8790d502 | 2000 | while(dev_nr < total_devs) { |
8790d502 | 2001 | if (total_devs > 1) { |
8790d502 CM |
2002 | if (dev_nr < total_devs - 1) { |
2003 | bio = bio_clone(first_bio, GFP_NOFS); | |
2004 | BUG_ON(!bio); | |
2005 | } else { | |
2006 | bio = first_bio; | |
2007 | } | |
2008 | bio->bi_private = multi; | |
2009 | bio->bi_end_io = end_bio_multi_stripe; | |
2010 | } | |
cea9e445 CM |
2011 | bio->bi_sector = multi->stripes[dev_nr].physical >> 9; |
2012 | dev = multi->stripes[dev_nr].dev; | |
dfe25020 CM |
2013 | if (dev && dev->bdev) { |
2014 | bio->bi_bdev = dev->bdev; | |
2015 | spin_lock(&dev->io_lock); | |
2016 | dev->total_ios++; | |
2017 | spin_unlock(&dev->io_lock); | |
2018 | submit_bio(rw, bio); | |
2019 | } else { | |
2020 | bio->bi_bdev = root->fs_info->fs_devices->latest_bdev; | |
2021 | bio->bi_sector = logical >> 9; | |
2022 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | |
2023 | bio_endio(bio, bio->bi_size, -EIO); | |
2024 | #else | |
2025 | bio_endio(bio, -EIO); | |
2026 | #endif | |
2027 | } | |
8790d502 CM |
2028 | dev_nr++; |
2029 | } | |
cea9e445 CM |
2030 | if (total_devs == 1) |
2031 | kfree(multi); | |
0b86a832 CM |
2032 | return 0; |
2033 | } | |
2034 | ||
a443755f CM |
2035 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, |
2036 | u8 *uuid) | |
0b86a832 | 2037 | { |
8a4b83cc | 2038 | struct list_head *head = &root->fs_info->fs_devices->devices; |
0b86a832 | 2039 | |
a443755f | 2040 | return __find_device(head, devid, uuid); |
0b86a832 CM |
2041 | } |
2042 | ||
dfe25020 CM |
2043 | static struct btrfs_device *add_missing_dev(struct btrfs_root *root, |
2044 | u64 devid, u8 *dev_uuid) | |
2045 | { | |
2046 | struct btrfs_device *device; | |
2047 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2048 | ||
2049 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
2050 | list_add(&device->dev_list, | |
2051 | &fs_devices->devices); | |
2052 | list_add(&device->dev_alloc_list, | |
2053 | &fs_devices->alloc_list); | |
2054 | device->barriers = 1; | |
2055 | device->dev_root = root->fs_info->dev_root; | |
2056 | device->devid = devid; | |
2057 | fs_devices->num_devices++; | |
2058 | spin_lock_init(&device->io_lock); | |
2059 | memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE); | |
2060 | return device; | |
2061 | } | |
2062 | ||
2063 | ||
0b86a832 CM |
2064 | static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, |
2065 | struct extent_buffer *leaf, | |
2066 | struct btrfs_chunk *chunk) | |
2067 | { | |
2068 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
2069 | struct map_lookup *map; | |
2070 | struct extent_map *em; | |
2071 | u64 logical; | |
2072 | u64 length; | |
2073 | u64 devid; | |
a443755f | 2074 | u8 uuid[BTRFS_UUID_SIZE]; |
593060d7 | 2075 | int num_stripes; |
0b86a832 | 2076 | int ret; |
593060d7 | 2077 | int i; |
0b86a832 | 2078 | |
e17cade2 CM |
2079 | logical = key->offset; |
2080 | length = btrfs_chunk_length(leaf, chunk); | |
a061fc8d | 2081 | |
0b86a832 CM |
2082 | spin_lock(&map_tree->map_tree.lock); |
2083 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); | |
b248a415 | 2084 | spin_unlock(&map_tree->map_tree.lock); |
0b86a832 CM |
2085 | |
2086 | /* already mapped? */ | |
2087 | if (em && em->start <= logical && em->start + em->len > logical) { | |
2088 | free_extent_map(em); | |
0b86a832 CM |
2089 | return 0; |
2090 | } else if (em) { | |
2091 | free_extent_map(em); | |
2092 | } | |
0b86a832 CM |
2093 | |
2094 | map = kzalloc(sizeof(*map), GFP_NOFS); | |
2095 | if (!map) | |
2096 | return -ENOMEM; | |
2097 | ||
2098 | em = alloc_extent_map(GFP_NOFS); | |
2099 | if (!em) | |
2100 | return -ENOMEM; | |
593060d7 CM |
2101 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); |
2102 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
0b86a832 CM |
2103 | if (!map) { |
2104 | free_extent_map(em); | |
2105 | return -ENOMEM; | |
2106 | } | |
2107 | ||
2108 | em->bdev = (struct block_device *)map; | |
2109 | em->start = logical; | |
2110 | em->len = length; | |
2111 | em->block_start = 0; | |
2112 | ||
593060d7 CM |
2113 | map->num_stripes = num_stripes; |
2114 | map->io_width = btrfs_chunk_io_width(leaf, chunk); | |
2115 | map->io_align = btrfs_chunk_io_align(leaf, chunk); | |
2116 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); | |
2117 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
2118 | map->type = btrfs_chunk_type(leaf, chunk); | |
321aecc6 | 2119 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
593060d7 CM |
2120 | for (i = 0; i < num_stripes; i++) { |
2121 | map->stripes[i].physical = | |
2122 | btrfs_stripe_offset_nr(leaf, chunk, i); | |
2123 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); | |
a443755f CM |
2124 | read_extent_buffer(leaf, uuid, (unsigned long) |
2125 | btrfs_stripe_dev_uuid_nr(chunk, i), | |
2126 | BTRFS_UUID_SIZE); | |
2127 | map->stripes[i].dev = btrfs_find_device(root, devid, uuid); | |
dfe25020 CM |
2128 | |
2129 | if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) { | |
593060d7 CM |
2130 | kfree(map); |
2131 | free_extent_map(em); | |
2132 | return -EIO; | |
2133 | } | |
dfe25020 CM |
2134 | if (!map->stripes[i].dev) { |
2135 | map->stripes[i].dev = | |
2136 | add_missing_dev(root, devid, uuid); | |
2137 | if (!map->stripes[i].dev) { | |
2138 | kfree(map); | |
2139 | free_extent_map(em); | |
2140 | return -EIO; | |
2141 | } | |
2142 | } | |
2143 | map->stripes[i].dev->in_fs_metadata = 1; | |
0b86a832 CM |
2144 | } |
2145 | ||
2146 | spin_lock(&map_tree->map_tree.lock); | |
2147 | ret = add_extent_mapping(&map_tree->map_tree, em); | |
0b86a832 | 2148 | spin_unlock(&map_tree->map_tree.lock); |
b248a415 | 2149 | BUG_ON(ret); |
0b86a832 CM |
2150 | free_extent_map(em); |
2151 | ||
2152 | return 0; | |
2153 | } | |
2154 | ||
2155 | static int fill_device_from_item(struct extent_buffer *leaf, | |
2156 | struct btrfs_dev_item *dev_item, | |
2157 | struct btrfs_device *device) | |
2158 | { | |
2159 | unsigned long ptr; | |
0b86a832 CM |
2160 | |
2161 | device->devid = btrfs_device_id(leaf, dev_item); | |
2162 | device->total_bytes = btrfs_device_total_bytes(leaf, dev_item); | |
2163 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); | |
2164 | device->type = btrfs_device_type(leaf, dev_item); | |
2165 | device->io_align = btrfs_device_io_align(leaf, dev_item); | |
2166 | device->io_width = btrfs_device_io_width(leaf, dev_item); | |
2167 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); | |
0b86a832 CM |
2168 | |
2169 | ptr = (unsigned long)btrfs_device_uuid(dev_item); | |
e17cade2 | 2170 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 | 2171 | |
0b86a832 CM |
2172 | return 0; |
2173 | } | |
2174 | ||
0d81ba5d | 2175 | static int read_one_dev(struct btrfs_root *root, |
0b86a832 CM |
2176 | struct extent_buffer *leaf, |
2177 | struct btrfs_dev_item *dev_item) | |
2178 | { | |
2179 | struct btrfs_device *device; | |
2180 | u64 devid; | |
2181 | int ret; | |
a443755f CM |
2182 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
2183 | ||
0b86a832 | 2184 | devid = btrfs_device_id(leaf, dev_item); |
a443755f CM |
2185 | read_extent_buffer(leaf, dev_uuid, |
2186 | (unsigned long)btrfs_device_uuid(dev_item), | |
2187 | BTRFS_UUID_SIZE); | |
2188 | device = btrfs_find_device(root, devid, dev_uuid); | |
6324fbf3 | 2189 | if (!device) { |
dfe25020 CM |
2190 | printk("warning devid %Lu missing\n", devid); |
2191 | device = add_missing_dev(root, devid, dev_uuid); | |
6324fbf3 CM |
2192 | if (!device) |
2193 | return -ENOMEM; | |
6324fbf3 | 2194 | } |
0b86a832 CM |
2195 | |
2196 | fill_device_from_item(leaf, dev_item, device); | |
2197 | device->dev_root = root->fs_info->dev_root; | |
dfe25020 | 2198 | device->in_fs_metadata = 1; |
0b86a832 CM |
2199 | ret = 0; |
2200 | #if 0 | |
2201 | ret = btrfs_open_device(device); | |
2202 | if (ret) { | |
2203 | kfree(device); | |
2204 | } | |
2205 | #endif | |
2206 | return ret; | |
2207 | } | |
2208 | ||
0d81ba5d CM |
2209 | int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf) |
2210 | { | |
2211 | struct btrfs_dev_item *dev_item; | |
2212 | ||
2213 | dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block, | |
2214 | dev_item); | |
2215 | return read_one_dev(root, buf, dev_item); | |
2216 | } | |
2217 | ||
0b86a832 CM |
2218 | int btrfs_read_sys_array(struct btrfs_root *root) |
2219 | { | |
2220 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
a061fc8d | 2221 | struct extent_buffer *sb; |
0b86a832 | 2222 | struct btrfs_disk_key *disk_key; |
0b86a832 | 2223 | struct btrfs_chunk *chunk; |
84eed90f CM |
2224 | u8 *ptr; |
2225 | unsigned long sb_ptr; | |
2226 | int ret = 0; | |
0b86a832 CM |
2227 | u32 num_stripes; |
2228 | u32 array_size; | |
2229 | u32 len = 0; | |
0b86a832 | 2230 | u32 cur; |
84eed90f | 2231 | struct btrfs_key key; |
0b86a832 | 2232 | |
a061fc8d CM |
2233 | sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET, |
2234 | BTRFS_SUPER_INFO_SIZE); | |
2235 | if (!sb) | |
2236 | return -ENOMEM; | |
2237 | btrfs_set_buffer_uptodate(sb); | |
2238 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); | |
0b86a832 CM |
2239 | array_size = btrfs_super_sys_array_size(super_copy); |
2240 | ||
0b86a832 CM |
2241 | ptr = super_copy->sys_chunk_array; |
2242 | sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array); | |
2243 | cur = 0; | |
2244 | ||
2245 | while (cur < array_size) { | |
2246 | disk_key = (struct btrfs_disk_key *)ptr; | |
2247 | btrfs_disk_key_to_cpu(&key, disk_key); | |
2248 | ||
a061fc8d | 2249 | len = sizeof(*disk_key); ptr += len; |
0b86a832 CM |
2250 | sb_ptr += len; |
2251 | cur += len; | |
2252 | ||
0d81ba5d | 2253 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
0b86a832 | 2254 | chunk = (struct btrfs_chunk *)sb_ptr; |
0d81ba5d | 2255 | ret = read_one_chunk(root, &key, sb, chunk); |
84eed90f CM |
2256 | if (ret) |
2257 | break; | |
0b86a832 CM |
2258 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); |
2259 | len = btrfs_chunk_item_size(num_stripes); | |
2260 | } else { | |
84eed90f CM |
2261 | ret = -EIO; |
2262 | break; | |
0b86a832 CM |
2263 | } |
2264 | ptr += len; | |
2265 | sb_ptr += len; | |
2266 | cur += len; | |
2267 | } | |
a061fc8d | 2268 | free_extent_buffer(sb); |
84eed90f | 2269 | return ret; |
0b86a832 CM |
2270 | } |
2271 | ||
2272 | int btrfs_read_chunk_tree(struct btrfs_root *root) | |
2273 | { | |
2274 | struct btrfs_path *path; | |
2275 | struct extent_buffer *leaf; | |
2276 | struct btrfs_key key; | |
2277 | struct btrfs_key found_key; | |
2278 | int ret; | |
2279 | int slot; | |
2280 | ||
2281 | root = root->fs_info->chunk_root; | |
2282 | ||
2283 | path = btrfs_alloc_path(); | |
2284 | if (!path) | |
2285 | return -ENOMEM; | |
2286 | ||
2287 | /* first we search for all of the device items, and then we | |
2288 | * read in all of the chunk items. This way we can create chunk | |
2289 | * mappings that reference all of the devices that are afound | |
2290 | */ | |
2291 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
2292 | key.offset = 0; | |
2293 | key.type = 0; | |
2294 | again: | |
2295 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2296 | while(1) { | |
2297 | leaf = path->nodes[0]; | |
2298 | slot = path->slots[0]; | |
2299 | if (slot >= btrfs_header_nritems(leaf)) { | |
2300 | ret = btrfs_next_leaf(root, path); | |
2301 | if (ret == 0) | |
2302 | continue; | |
2303 | if (ret < 0) | |
2304 | goto error; | |
2305 | break; | |
2306 | } | |
2307 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
2308 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
2309 | if (found_key.objectid != BTRFS_DEV_ITEMS_OBJECTID) | |
2310 | break; | |
2311 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { | |
2312 | struct btrfs_dev_item *dev_item; | |
2313 | dev_item = btrfs_item_ptr(leaf, slot, | |
2314 | struct btrfs_dev_item); | |
0d81ba5d | 2315 | ret = read_one_dev(root, leaf, dev_item); |
0b86a832 CM |
2316 | BUG_ON(ret); |
2317 | } | |
2318 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { | |
2319 | struct btrfs_chunk *chunk; | |
2320 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); | |
2321 | ret = read_one_chunk(root, &found_key, leaf, chunk); | |
2322 | } | |
2323 | path->slots[0]++; | |
2324 | } | |
2325 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
2326 | key.objectid = 0; | |
2327 | btrfs_release_path(root, path); | |
2328 | goto again; | |
2329 | } | |
2330 | ||
2331 | btrfs_free_path(path); | |
2332 | ret = 0; | |
2333 | error: | |
2334 | return ret; | |
2335 | } | |
2336 |