Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 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> |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 20 | #include <linux/buffer_head.h> |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 21 | #include <linux/blkdev.h> |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 22 | #include <linux/random.h> |
Chris Mason | b765ead | 2009-04-03 10:27:10 -0400 | [diff] [blame] | 23 | #include <linux/iocontext.h> |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 24 | #include <asm/div64.h> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 25 | #include "compat.h" |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 26 | #include "ctree.h" |
| 27 | #include "extent_map.h" |
| 28 | #include "disk-io.h" |
| 29 | #include "transaction.h" |
| 30 | #include "print-tree.h" |
| 31 | #include "volumes.h" |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 32 | #include "async-thread.h" |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 33 | |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 34 | struct map_lookup { |
| 35 | u64 type; |
| 36 | int io_align; |
| 37 | int io_width; |
| 38 | int stripe_len; |
| 39 | int sector_size; |
| 40 | int num_stripes; |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 41 | int sub_stripes; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 42 | struct btrfs_bio_stripe stripes[]; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 43 | }; |
| 44 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 45 | static int init_first_rw_device(struct btrfs_trans_handle *trans, |
| 46 | struct btrfs_root *root, |
| 47 | struct btrfs_device *device); |
| 48 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root); |
| 49 | |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 50 | #define map_lookup_size(n) (sizeof(struct map_lookup) + \ |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 51 | (sizeof(struct btrfs_bio_stripe) * (n))) |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 52 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 53 | static DEFINE_MUTEX(uuid_mutex); |
| 54 | static LIST_HEAD(fs_uuids); |
| 55 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 56 | void btrfs_lock_volumes(void) |
| 57 | { |
| 58 | mutex_lock(&uuid_mutex); |
| 59 | } |
| 60 | |
| 61 | void btrfs_unlock_volumes(void) |
| 62 | { |
| 63 | mutex_unlock(&uuid_mutex); |
| 64 | } |
| 65 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 66 | static void lock_chunks(struct btrfs_root *root) |
| 67 | { |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 68 | mutex_lock(&root->fs_info->chunk_mutex); |
| 69 | } |
| 70 | |
| 71 | static void unlock_chunks(struct btrfs_root *root) |
| 72 | { |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 73 | mutex_unlock(&root->fs_info->chunk_mutex); |
| 74 | } |
| 75 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 76 | static void free_fs_devices(struct btrfs_fs_devices *fs_devices) |
| 77 | { |
| 78 | struct btrfs_device *device; |
| 79 | WARN_ON(fs_devices->opened); |
| 80 | while (!list_empty(&fs_devices->devices)) { |
| 81 | device = list_entry(fs_devices->devices.next, |
| 82 | struct btrfs_device, dev_list); |
| 83 | list_del(&device->dev_list); |
| 84 | kfree(device->name); |
| 85 | kfree(device); |
| 86 | } |
| 87 | kfree(fs_devices); |
| 88 | } |
| 89 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 90 | int btrfs_cleanup_fs_uuids(void) |
| 91 | { |
| 92 | struct btrfs_fs_devices *fs_devices; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 93 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 94 | while (!list_empty(&fs_uuids)) { |
| 95 | fs_devices = list_entry(fs_uuids.next, |
| 96 | struct btrfs_fs_devices, list); |
| 97 | list_del(&fs_devices->list); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 98 | free_fs_devices(fs_devices); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 99 | } |
| 100 | return 0; |
| 101 | } |
| 102 | |
Chris Mason | a1b32a5 | 2008-09-05 16:09:51 -0400 | [diff] [blame] | 103 | static noinline struct btrfs_device *__find_device(struct list_head *head, |
| 104 | u64 devid, u8 *uuid) |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 105 | { |
| 106 | struct btrfs_device *dev; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 107 | |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 108 | list_for_each_entry(dev, head, dev_list) { |
Chris Mason | a443755 | 2008-04-18 10:29:38 -0400 | [diff] [blame] | 109 | if (dev->devid == devid && |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 110 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 111 | return dev; |
Chris Mason | a443755 | 2008-04-18 10:29:38 -0400 | [diff] [blame] | 112 | } |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 113 | } |
| 114 | return NULL; |
| 115 | } |
| 116 | |
Chris Mason | a1b32a5 | 2008-09-05 16:09:51 -0400 | [diff] [blame] | 117 | static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid) |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 118 | { |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 119 | struct btrfs_fs_devices *fs_devices; |
| 120 | |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 121 | list_for_each_entry(fs_devices, &fs_uuids, list) { |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 122 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) |
| 123 | return fs_devices; |
| 124 | } |
| 125 | return NULL; |
| 126 | } |
| 127 | |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 128 | static void requeue_list(struct btrfs_pending_bios *pending_bios, |
| 129 | struct bio *head, struct bio *tail) |
| 130 | { |
| 131 | |
| 132 | struct bio *old_head; |
| 133 | |
| 134 | old_head = pending_bios->head; |
| 135 | pending_bios->head = head; |
| 136 | if (pending_bios->tail) |
| 137 | tail->bi_next = old_head; |
| 138 | else |
| 139 | pending_bios->tail = tail; |
| 140 | } |
| 141 | |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 142 | /* |
| 143 | * we try to collect pending bios for a device so we don't get a large |
| 144 | * number of procs sending bios down to the same device. This greatly |
| 145 | * improves the schedulers ability to collect and merge the bios. |
| 146 | * |
| 147 | * But, it also turns into a long list of bios to process and that is sure |
| 148 | * to eventually make the worker thread block. The solution here is to |
| 149 | * make some progress and then put this work struct back at the end of |
| 150 | * the list if the block device is congested. This way, multiple devices |
| 151 | * can make progress from a single worker thread. |
| 152 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 153 | static noinline int run_scheduled_bios(struct btrfs_device *device) |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 154 | { |
| 155 | struct bio *pending; |
| 156 | struct backing_dev_info *bdi; |
Chris Mason | b64a285 | 2008-08-20 13:39:41 -0400 | [diff] [blame] | 157 | struct btrfs_fs_info *fs_info; |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 158 | struct btrfs_pending_bios *pending_bios; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 159 | struct bio *tail; |
| 160 | struct bio *cur; |
| 161 | int again = 0; |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 162 | unsigned long num_run; |
| 163 | unsigned long num_sync_run; |
Chris Mason | d644d8a | 2009-06-09 15:59:22 -0400 | [diff] [blame] | 164 | unsigned long batch_run = 0; |
Chris Mason | b64a285 | 2008-08-20 13:39:41 -0400 | [diff] [blame] | 165 | unsigned long limit; |
Chris Mason | b765ead | 2009-04-03 10:27:10 -0400 | [diff] [blame] | 166 | unsigned long last_waited = 0; |
Chris Mason | d84275c | 2009-06-09 15:39:08 -0400 | [diff] [blame] | 167 | int force_reg = 0; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 168 | |
Chris Mason | bedf762 | 2009-04-03 10:32:58 -0400 | [diff] [blame] | 169 | bdi = blk_get_backing_dev_info(device->bdev); |
Chris Mason | b64a285 | 2008-08-20 13:39:41 -0400 | [diff] [blame] | 170 | fs_info = device->dev_root->fs_info; |
| 171 | limit = btrfs_async_submit_limit(fs_info); |
| 172 | limit = limit * 2 / 3; |
| 173 | |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 174 | /* we want to make sure that every time we switch from the sync |
| 175 | * list to the normal list, we unplug |
| 176 | */ |
| 177 | num_sync_run = 0; |
| 178 | |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 179 | loop: |
| 180 | spin_lock(&device->io_lock); |
| 181 | |
Chris Mason | a683705 | 2009-02-04 09:19:41 -0500 | [diff] [blame] | 182 | loop_lock: |
Chris Mason | d84275c | 2009-06-09 15:39:08 -0400 | [diff] [blame] | 183 | num_run = 0; |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 184 | |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 185 | /* take all the bios off the list at once and process them |
| 186 | * later on (without the lock held). But, remember the |
| 187 | * tail and other pointers so the bios can be properly reinserted |
| 188 | * into the list if we hit congestion |
| 189 | */ |
Chris Mason | d84275c | 2009-06-09 15:39:08 -0400 | [diff] [blame] | 190 | if (!force_reg && device->pending_sync_bios.head) { |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 191 | pending_bios = &device->pending_sync_bios; |
Chris Mason | d84275c | 2009-06-09 15:39:08 -0400 | [diff] [blame] | 192 | force_reg = 1; |
| 193 | } else { |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 194 | pending_bios = &device->pending_bios; |
Chris Mason | d84275c | 2009-06-09 15:39:08 -0400 | [diff] [blame] | 195 | force_reg = 0; |
| 196 | } |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 197 | |
| 198 | pending = pending_bios->head; |
| 199 | tail = pending_bios->tail; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 200 | WARN_ON(pending && !tail); |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 201 | |
| 202 | /* |
| 203 | * if pending was null this time around, no bios need processing |
| 204 | * at all and we can stop. Otherwise it'll loop back up again |
| 205 | * and do an additional check so no bios are missed. |
| 206 | * |
| 207 | * device->running_pending is used to synchronize with the |
| 208 | * schedule_bio code. |
| 209 | */ |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 210 | if (device->pending_sync_bios.head == NULL && |
| 211 | device->pending_bios.head == NULL) { |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 212 | again = 0; |
| 213 | device->running_pending = 0; |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 214 | } else { |
| 215 | again = 1; |
| 216 | device->running_pending = 1; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 217 | } |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 218 | |
| 219 | pending_bios->head = NULL; |
| 220 | pending_bios->tail = NULL; |
| 221 | |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 222 | spin_unlock(&device->io_lock); |
| 223 | |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 224 | /* |
| 225 | * if we're doing the regular priority list, make sure we unplug |
| 226 | * for any high prio bios we've sent down |
| 227 | */ |
| 228 | if (pending_bios == &device->pending_bios && num_sync_run > 0) { |
| 229 | num_sync_run = 0; |
| 230 | blk_run_backing_dev(bdi, NULL); |
| 231 | } |
| 232 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 233 | while (pending) { |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 234 | |
| 235 | rmb(); |
Chris Mason | d84275c | 2009-06-09 15:39:08 -0400 | [diff] [blame] | 236 | /* we want to work on both lists, but do more bios on the |
| 237 | * sync list than the regular list |
| 238 | */ |
| 239 | if ((num_run > 32 && |
| 240 | pending_bios != &device->pending_sync_bios && |
| 241 | device->pending_sync_bios.head) || |
| 242 | (num_run > 64 && pending_bios == &device->pending_sync_bios && |
| 243 | device->pending_bios.head)) { |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 244 | spin_lock(&device->io_lock); |
| 245 | requeue_list(pending_bios, pending, tail); |
| 246 | goto loop_lock; |
| 247 | } |
| 248 | |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 249 | cur = pending; |
| 250 | pending = pending->bi_next; |
| 251 | cur->bi_next = NULL; |
Chris Mason | b64a285 | 2008-08-20 13:39:41 -0400 | [diff] [blame] | 252 | atomic_dec(&fs_info->nr_async_bios); |
| 253 | |
| 254 | if (atomic_read(&fs_info->nr_async_bios) < limit && |
| 255 | waitqueue_active(&fs_info->async_submit_wait)) |
| 256 | wake_up(&fs_info->async_submit_wait); |
Chris Mason | 492bb6d | 2008-07-31 16:29:02 -0400 | [diff] [blame] | 257 | |
| 258 | BUG_ON(atomic_read(&cur->bi_cnt) == 0); |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 259 | submit_bio(cur->bi_rw, cur); |
| 260 | num_run++; |
Chris Mason | d644d8a | 2009-06-09 15:59:22 -0400 | [diff] [blame] | 261 | batch_run++; |
| 262 | |
Jens Axboe | 1f98a13 | 2009-09-11 14:32:04 +0200 | [diff] [blame] | 263 | if (bio_rw_flagged(cur, BIO_RW_SYNCIO)) |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 264 | num_sync_run++; |
| 265 | |
| 266 | if (need_resched()) { |
| 267 | if (num_sync_run) { |
| 268 | blk_run_backing_dev(bdi, NULL); |
| 269 | num_sync_run = 0; |
| 270 | } |
| 271 | cond_resched(); |
| 272 | } |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 273 | |
| 274 | /* |
| 275 | * we made progress, there is more work to do and the bdi |
| 276 | * is now congested. Back off and let other work structs |
| 277 | * run instead |
| 278 | */ |
Chris Mason | 57fd5a5 | 2009-08-07 09:59:15 -0400 | [diff] [blame] | 279 | if (pending && bdi_write_congested(bdi) && batch_run > 8 && |
Chris Mason | 5f2cc08 | 2008-11-07 18:22:45 -0500 | [diff] [blame] | 280 | fs_info->fs_devices->open_devices > 1) { |
Chris Mason | b765ead | 2009-04-03 10:27:10 -0400 | [diff] [blame] | 281 | struct io_context *ioc; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 282 | |
Chris Mason | b765ead | 2009-04-03 10:27:10 -0400 | [diff] [blame] | 283 | ioc = current->io_context; |
| 284 | |
| 285 | /* |
| 286 | * the main goal here is that we don't want to |
| 287 | * block if we're going to be able to submit |
| 288 | * more requests without blocking. |
| 289 | * |
| 290 | * This code does two great things, it pokes into |
| 291 | * the elevator code from a filesystem _and_ |
| 292 | * it makes assumptions about how batching works. |
| 293 | */ |
| 294 | if (ioc && ioc->nr_batch_requests > 0 && |
| 295 | time_before(jiffies, ioc->last_waited + HZ/50UL) && |
| 296 | (last_waited == 0 || |
| 297 | ioc->last_waited == last_waited)) { |
| 298 | /* |
| 299 | * we want to go through our batch of |
| 300 | * requests and stop. So, we copy out |
| 301 | * the ioc->last_waited time and test |
| 302 | * against it before looping |
| 303 | */ |
| 304 | last_waited = ioc->last_waited; |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 305 | if (need_resched()) { |
| 306 | if (num_sync_run) { |
| 307 | blk_run_backing_dev(bdi, NULL); |
| 308 | num_sync_run = 0; |
| 309 | } |
| 310 | cond_resched(); |
| 311 | } |
Chris Mason | b765ead | 2009-04-03 10:27:10 -0400 | [diff] [blame] | 312 | continue; |
| 313 | } |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 314 | spin_lock(&device->io_lock); |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 315 | requeue_list(pending_bios, pending, tail); |
Chris Mason | a683705 | 2009-02-04 09:19:41 -0500 | [diff] [blame] | 316 | device->running_pending = 1; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 317 | |
| 318 | spin_unlock(&device->io_lock); |
| 319 | btrfs_requeue_work(&device->work); |
| 320 | goto done; |
| 321 | } |
| 322 | } |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 323 | |
| 324 | if (num_sync_run) { |
| 325 | num_sync_run = 0; |
| 326 | blk_run_backing_dev(bdi, NULL); |
| 327 | } |
Chris Mason | bedf762 | 2009-04-03 10:32:58 -0400 | [diff] [blame] | 328 | /* |
| 329 | * IO has already been through a long path to get here. Checksumming, |
| 330 | * async helper threads, perhaps compression. We've done a pretty |
| 331 | * good job of collecting a batch of IO and should just unplug |
| 332 | * the device right away. |
| 333 | * |
| 334 | * This will help anyone who is waiting on the IO, they might have |
| 335 | * already unplugged, but managed to do so before the bio they |
| 336 | * cared about found its way down here. |
| 337 | */ |
| 338 | blk_run_backing_dev(bdi, NULL); |
Chris Mason | 5168408 | 2010-03-10 15:33:32 -0500 | [diff] [blame] | 339 | |
| 340 | cond_resched(); |
| 341 | if (again) |
| 342 | goto loop; |
| 343 | |
| 344 | spin_lock(&device->io_lock); |
| 345 | if (device->pending_bios.head || device->pending_sync_bios.head) |
| 346 | goto loop_lock; |
| 347 | spin_unlock(&device->io_lock); |
| 348 | |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 349 | done: |
| 350 | return 0; |
| 351 | } |
| 352 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 353 | static void pending_bios_fn(struct btrfs_work *work) |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 354 | { |
| 355 | struct btrfs_device *device; |
| 356 | |
| 357 | device = container_of(work, struct btrfs_device, work); |
| 358 | run_scheduled_bios(device); |
| 359 | } |
| 360 | |
Chris Mason | a1b32a5 | 2008-09-05 16:09:51 -0400 | [diff] [blame] | 361 | static noinline int device_list_add(const char *path, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 362 | struct btrfs_super_block *disk_super, |
| 363 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) |
| 364 | { |
| 365 | struct btrfs_device *device; |
| 366 | struct btrfs_fs_devices *fs_devices; |
| 367 | u64 found_transid = btrfs_super_generation(disk_super); |
TARUISI Hiroaki | 3a0524d | 2010-02-09 06:36:45 +0000 | [diff] [blame^] | 368 | char *name; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 369 | |
| 370 | fs_devices = find_fsid(disk_super->fsid); |
| 371 | if (!fs_devices) { |
Chris Mason | 515dc32 | 2008-05-16 13:30:15 -0400 | [diff] [blame] | 372 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 373 | if (!fs_devices) |
| 374 | return -ENOMEM; |
| 375 | INIT_LIST_HEAD(&fs_devices->devices); |
Chris Mason | b307571 | 2008-04-22 09:22:07 -0400 | [diff] [blame] | 376 | INIT_LIST_HEAD(&fs_devices->alloc_list); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 377 | list_add(&fs_devices->list, &fs_uuids); |
| 378 | memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE); |
| 379 | fs_devices->latest_devid = devid; |
| 380 | fs_devices->latest_trans = found_transid; |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 381 | mutex_init(&fs_devices->device_list_mutex); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 382 | device = NULL; |
| 383 | } else { |
Chris Mason | a443755 | 2008-04-18 10:29:38 -0400 | [diff] [blame] | 384 | device = __find_device(&fs_devices->devices, devid, |
| 385 | disk_super->dev_item.uuid); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 386 | } |
| 387 | if (!device) { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 388 | if (fs_devices->opened) |
| 389 | return -EBUSY; |
| 390 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 391 | device = kzalloc(sizeof(*device), GFP_NOFS); |
| 392 | if (!device) { |
| 393 | /* we can safely leave the fs_devices entry around */ |
| 394 | return -ENOMEM; |
| 395 | } |
| 396 | device->devid = devid; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 397 | device->work.func = pending_bios_fn; |
Chris Mason | a443755 | 2008-04-18 10:29:38 -0400 | [diff] [blame] | 398 | memcpy(device->uuid, disk_super->dev_item.uuid, |
| 399 | BTRFS_UUID_SIZE); |
Chris Mason | f298446 | 2008-04-10 16:19:33 -0400 | [diff] [blame] | 400 | device->barriers = 1; |
Chris Mason | b248a41 | 2008-04-14 09:48:18 -0400 | [diff] [blame] | 401 | spin_lock_init(&device->io_lock); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 402 | device->name = kstrdup(path, GFP_NOFS); |
| 403 | if (!device->name) { |
| 404 | kfree(device); |
| 405 | return -ENOMEM; |
| 406 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 407 | INIT_LIST_HEAD(&device->dev_alloc_list); |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 408 | |
| 409 | mutex_lock(&fs_devices->device_list_mutex); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 410 | list_add(&device->dev_list, &fs_devices->devices); |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 411 | mutex_unlock(&fs_devices->device_list_mutex); |
| 412 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 413 | device->fs_devices = fs_devices; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 414 | fs_devices->num_devices++; |
TARUISI Hiroaki | 3a0524d | 2010-02-09 06:36:45 +0000 | [diff] [blame^] | 415 | } else if (strcmp(device->name, path)) { |
| 416 | name = kstrdup(path, GFP_NOFS); |
| 417 | if (!name) |
| 418 | return -ENOMEM; |
| 419 | kfree(device->name); |
| 420 | device->name = name; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | if (found_transid > fs_devices->latest_trans) { |
| 424 | fs_devices->latest_devid = devid; |
| 425 | fs_devices->latest_trans = found_transid; |
| 426 | } |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 427 | *fs_devices_ret = fs_devices; |
| 428 | return 0; |
| 429 | } |
| 430 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 431 | static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) |
| 432 | { |
| 433 | struct btrfs_fs_devices *fs_devices; |
| 434 | struct btrfs_device *device; |
| 435 | struct btrfs_device *orig_dev; |
| 436 | |
| 437 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
| 438 | if (!fs_devices) |
| 439 | return ERR_PTR(-ENOMEM); |
| 440 | |
| 441 | INIT_LIST_HEAD(&fs_devices->devices); |
| 442 | INIT_LIST_HEAD(&fs_devices->alloc_list); |
| 443 | INIT_LIST_HEAD(&fs_devices->list); |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 444 | mutex_init(&fs_devices->device_list_mutex); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 445 | fs_devices->latest_devid = orig->latest_devid; |
| 446 | fs_devices->latest_trans = orig->latest_trans; |
| 447 | memcpy(fs_devices->fsid, orig->fsid, sizeof(fs_devices->fsid)); |
| 448 | |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 449 | mutex_lock(&orig->device_list_mutex); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 450 | list_for_each_entry(orig_dev, &orig->devices, dev_list) { |
| 451 | device = kzalloc(sizeof(*device), GFP_NOFS); |
| 452 | if (!device) |
| 453 | goto error; |
| 454 | |
| 455 | device->name = kstrdup(orig_dev->name, GFP_NOFS); |
Julia Lawall | fd2696f | 2009-09-29 13:51:04 -0400 | [diff] [blame] | 456 | if (!device->name) { |
| 457 | kfree(device); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 458 | goto error; |
Julia Lawall | fd2696f | 2009-09-29 13:51:04 -0400 | [diff] [blame] | 459 | } |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 460 | |
| 461 | device->devid = orig_dev->devid; |
| 462 | device->work.func = pending_bios_fn; |
| 463 | memcpy(device->uuid, orig_dev->uuid, sizeof(device->uuid)); |
| 464 | device->barriers = 1; |
| 465 | spin_lock_init(&device->io_lock); |
| 466 | INIT_LIST_HEAD(&device->dev_list); |
| 467 | INIT_LIST_HEAD(&device->dev_alloc_list); |
| 468 | |
| 469 | list_add(&device->dev_list, &fs_devices->devices); |
| 470 | device->fs_devices = fs_devices; |
| 471 | fs_devices->num_devices++; |
| 472 | } |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 473 | mutex_unlock(&orig->device_list_mutex); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 474 | return fs_devices; |
| 475 | error: |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 476 | mutex_unlock(&orig->device_list_mutex); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 477 | free_fs_devices(fs_devices); |
| 478 | return ERR_PTR(-ENOMEM); |
| 479 | } |
| 480 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 481 | int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices) |
| 482 | { |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 483 | struct btrfs_device *device, *next; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 484 | |
| 485 | mutex_lock(&uuid_mutex); |
| 486 | again: |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 487 | mutex_lock(&fs_devices->device_list_mutex); |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 488 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 489 | if (device->in_fs_metadata) |
| 490 | continue; |
| 491 | |
| 492 | if (device->bdev) { |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 493 | close_bdev_exclusive(device->bdev, device->mode); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 494 | device->bdev = NULL; |
| 495 | fs_devices->open_devices--; |
| 496 | } |
| 497 | if (device->writeable) { |
| 498 | list_del_init(&device->dev_alloc_list); |
| 499 | device->writeable = 0; |
| 500 | fs_devices->rw_devices--; |
| 501 | } |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 502 | list_del_init(&device->dev_list); |
| 503 | fs_devices->num_devices--; |
| 504 | kfree(device->name); |
| 505 | kfree(device); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 506 | } |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 507 | mutex_unlock(&fs_devices->device_list_mutex); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 508 | |
| 509 | if (fs_devices->seed) { |
| 510 | fs_devices = fs_devices->seed; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 511 | goto again; |
| 512 | } |
| 513 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 514 | mutex_unlock(&uuid_mutex); |
| 515 | return 0; |
| 516 | } |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 517 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 518 | static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 519 | { |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 520 | struct btrfs_device *device; |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 521 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 522 | if (--fs_devices->opened > 0) |
| 523 | return 0; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 524 | |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 525 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 526 | if (device->bdev) { |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 527 | close_bdev_exclusive(device->bdev, device->mode); |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 528 | fs_devices->open_devices--; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 529 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 530 | if (device->writeable) { |
| 531 | list_del_init(&device->dev_alloc_list); |
| 532 | fs_devices->rw_devices--; |
| 533 | } |
| 534 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 535 | device->bdev = NULL; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 536 | device->writeable = 0; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 537 | device->in_fs_metadata = 0; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 538 | } |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 539 | WARN_ON(fs_devices->open_devices); |
| 540 | WARN_ON(fs_devices->rw_devices); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 541 | fs_devices->opened = 0; |
| 542 | fs_devices->seeding = 0; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 543 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 544 | return 0; |
| 545 | } |
| 546 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 547 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
| 548 | { |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 549 | struct btrfs_fs_devices *seed_devices = NULL; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 550 | int ret; |
| 551 | |
| 552 | mutex_lock(&uuid_mutex); |
| 553 | ret = __btrfs_close_devices(fs_devices); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 554 | if (!fs_devices->opened) { |
| 555 | seed_devices = fs_devices->seed; |
| 556 | fs_devices->seed = NULL; |
| 557 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 558 | mutex_unlock(&uuid_mutex); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 559 | |
| 560 | while (seed_devices) { |
| 561 | fs_devices = seed_devices; |
| 562 | seed_devices = fs_devices->seed; |
| 563 | __btrfs_close_devices(fs_devices); |
| 564 | free_fs_devices(fs_devices); |
| 565 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 566 | return ret; |
| 567 | } |
| 568 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 569 | static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
| 570 | fmode_t flags, void *holder) |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 571 | { |
| 572 | struct block_device *bdev; |
| 573 | struct list_head *head = &fs_devices->devices; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 574 | struct btrfs_device *device; |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 575 | struct block_device *latest_bdev = NULL; |
| 576 | struct buffer_head *bh; |
| 577 | struct btrfs_super_block *disk_super; |
| 578 | u64 latest_devid = 0; |
| 579 | u64 latest_transid = 0; |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 580 | u64 devid; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 581 | int seeding = 1; |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 582 | int ret = 0; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 583 | |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 584 | list_for_each_entry(device, head, dev_list) { |
Chris Mason | c1c4d91 | 2008-05-08 15:05:58 -0400 | [diff] [blame] | 585 | if (device->bdev) |
| 586 | continue; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 587 | if (!device->name) |
| 588 | continue; |
| 589 | |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 590 | bdev = open_bdev_exclusive(device->name, flags, holder); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 591 | if (IS_ERR(bdev)) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 592 | printk(KERN_INFO "open %s failed\n", device->name); |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 593 | goto error; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 594 | } |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 595 | set_blocksize(bdev, 4096); |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 596 | |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 597 | bh = btrfs_read_dev_super(bdev); |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 598 | if (!bh) |
| 599 | goto error_close; |
| 600 | |
| 601 | disk_super = (struct btrfs_super_block *)bh->b_data; |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 602 | devid = le64_to_cpu(disk_super->dev_item.devid); |
| 603 | if (devid != device->devid) |
| 604 | goto error_brelse; |
| 605 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 606 | if (memcmp(device->uuid, disk_super->dev_item.uuid, |
| 607 | BTRFS_UUID_SIZE)) |
| 608 | goto error_brelse; |
| 609 | |
| 610 | device->generation = btrfs_super_generation(disk_super); |
| 611 | if (!latest_transid || device->generation > latest_transid) { |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 612 | latest_devid = devid; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 613 | latest_transid = device->generation; |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 614 | latest_bdev = bdev; |
| 615 | } |
| 616 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 617 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { |
| 618 | device->writeable = 0; |
| 619 | } else { |
| 620 | device->writeable = !bdev_read_only(bdev); |
| 621 | seeding = 0; |
| 622 | } |
| 623 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 624 | device->bdev = bdev; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 625 | device->in_fs_metadata = 0; |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 626 | device->mode = flags; |
| 627 | |
Chris Mason | c289811 | 2009-06-10 09:51:32 -0400 | [diff] [blame] | 628 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
| 629 | fs_devices->rotating = 1; |
| 630 | |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 631 | fs_devices->open_devices++; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 632 | if (device->writeable) { |
| 633 | fs_devices->rw_devices++; |
| 634 | list_add(&device->dev_alloc_list, |
| 635 | &fs_devices->alloc_list); |
| 636 | } |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 637 | continue; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 638 | |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 639 | error_brelse: |
| 640 | brelse(bh); |
| 641 | error_close: |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 642 | close_bdev_exclusive(bdev, FMODE_READ); |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 643 | error: |
| 644 | continue; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 645 | } |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 646 | if (fs_devices->open_devices == 0) { |
| 647 | ret = -EIO; |
| 648 | goto out; |
| 649 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 650 | fs_devices->seeding = seeding; |
| 651 | fs_devices->opened = 1; |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 652 | fs_devices->latest_bdev = latest_bdev; |
| 653 | fs_devices->latest_devid = latest_devid; |
| 654 | fs_devices->latest_trans = latest_transid; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 655 | fs_devices->total_rw_bytes = 0; |
Chris Mason | a0af469 | 2008-05-13 16:03:06 -0400 | [diff] [blame] | 656 | out: |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 657 | return ret; |
| 658 | } |
| 659 | |
| 660 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 661 | fmode_t flags, void *holder) |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 662 | { |
| 663 | int ret; |
| 664 | |
| 665 | mutex_lock(&uuid_mutex); |
| 666 | if (fs_devices->opened) { |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 667 | fs_devices->opened++; |
| 668 | ret = 0; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 669 | } else { |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 670 | ret = __btrfs_open_devices(fs_devices, flags, holder); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 671 | } |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 672 | mutex_unlock(&uuid_mutex); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 673 | return ret; |
| 674 | } |
| 675 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 676 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 677 | struct btrfs_fs_devices **fs_devices_ret) |
| 678 | { |
| 679 | struct btrfs_super_block *disk_super; |
| 680 | struct block_device *bdev; |
| 681 | struct buffer_head *bh; |
| 682 | int ret; |
| 683 | u64 devid; |
Chris Mason | f298446 | 2008-04-10 16:19:33 -0400 | [diff] [blame] | 684 | u64 transid; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 685 | |
| 686 | mutex_lock(&uuid_mutex); |
| 687 | |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 688 | bdev = open_bdev_exclusive(path, flags, holder); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 689 | |
| 690 | if (IS_ERR(bdev)) { |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 691 | ret = PTR_ERR(bdev); |
| 692 | goto error; |
| 693 | } |
| 694 | |
| 695 | ret = set_blocksize(bdev, 4096); |
| 696 | if (ret) |
| 697 | goto error_close; |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 698 | bh = btrfs_read_dev_super(bdev); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 699 | if (!bh) { |
| 700 | ret = -EIO; |
| 701 | goto error_close; |
| 702 | } |
| 703 | disk_super = (struct btrfs_super_block *)bh->b_data; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 704 | devid = le64_to_cpu(disk_super->dev_item.devid); |
Chris Mason | f298446 | 2008-04-10 16:19:33 -0400 | [diff] [blame] | 705 | transid = btrfs_super_generation(disk_super); |
Chris Mason | 7ae9c09 | 2008-04-18 10:29:49 -0400 | [diff] [blame] | 706 | if (disk_super->label[0]) |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 707 | printk(KERN_INFO "device label %s ", disk_super->label); |
Chris Mason | 7ae9c09 | 2008-04-18 10:29:49 -0400 | [diff] [blame] | 708 | else { |
| 709 | /* FIXME, make a readl uuid parser */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 710 | printk(KERN_INFO "device fsid %llx-%llx ", |
Chris Mason | 7ae9c09 | 2008-04-18 10:29:49 -0400 | [diff] [blame] | 711 | *(unsigned long long *)disk_super->fsid, |
| 712 | *(unsigned long long *)(disk_super->fsid + 8)); |
| 713 | } |
Roland Dreier | 119e10c | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 714 | printk(KERN_CONT "devid %llu transid %llu %s\n", |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 715 | (unsigned long long)devid, (unsigned long long)transid, path); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 716 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
| 717 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 718 | brelse(bh); |
| 719 | error_close: |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 720 | close_bdev_exclusive(bdev, flags); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 721 | error: |
| 722 | mutex_unlock(&uuid_mutex); |
| 723 | return ret; |
| 724 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 725 | |
| 726 | /* |
| 727 | * this uses a pretty simple search, the expectation is that it is |
| 728 | * called very infrequently and that a given device has a small number |
| 729 | * of extents |
| 730 | */ |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 731 | int find_free_dev_extent(struct btrfs_trans_handle *trans, |
| 732 | struct btrfs_device *device, u64 num_bytes, |
| 733 | u64 *start, u64 *max_avail) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 734 | { |
| 735 | struct btrfs_key key; |
| 736 | struct btrfs_root *root = device->dev_root; |
| 737 | struct btrfs_dev_extent *dev_extent = NULL; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 738 | struct btrfs_path *path; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 739 | u64 hole_size = 0; |
| 740 | u64 last_byte = 0; |
| 741 | u64 search_start = 0; |
| 742 | u64 search_end = device->total_bytes; |
| 743 | int ret; |
| 744 | int slot = 0; |
| 745 | int start_found; |
| 746 | struct extent_buffer *l; |
| 747 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 748 | path = btrfs_alloc_path(); |
| 749 | if (!path) |
| 750 | return -ENOMEM; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 751 | path->reada = 2; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 752 | start_found = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 753 | |
| 754 | /* FIXME use last free of some kind */ |
| 755 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 756 | /* we don't want to overwrite the superblock on the drive, |
| 757 | * so we make sure to start at an offset of at least 1MB |
| 758 | */ |
| 759 | search_start = max((u64)1024 * 1024, search_start); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 760 | |
| 761 | if (root->fs_info->alloc_start + num_bytes <= device->total_bytes) |
| 762 | search_start = max(root->fs_info->alloc_start, search_start); |
| 763 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 764 | key.objectid = device->devid; |
| 765 | key.offset = search_start; |
| 766 | key.type = BTRFS_DEV_EXTENT_KEY; |
| 767 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); |
| 768 | if (ret < 0) |
| 769 | goto error; |
Yan Zheng | 1fcbac5 | 2009-07-24 11:06:53 -0400 | [diff] [blame] | 770 | if (ret > 0) { |
| 771 | ret = btrfs_previous_item(root, path, key.objectid, key.type); |
| 772 | if (ret < 0) |
| 773 | goto error; |
| 774 | if (ret > 0) |
| 775 | start_found = 1; |
| 776 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 777 | l = path->nodes[0]; |
| 778 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); |
| 779 | while (1) { |
| 780 | l = path->nodes[0]; |
| 781 | slot = path->slots[0]; |
| 782 | if (slot >= btrfs_header_nritems(l)) { |
| 783 | ret = btrfs_next_leaf(root, path); |
| 784 | if (ret == 0) |
| 785 | continue; |
| 786 | if (ret < 0) |
| 787 | goto error; |
| 788 | no_more_items: |
| 789 | if (!start_found) { |
| 790 | if (search_start >= search_end) { |
| 791 | ret = -ENOSPC; |
| 792 | goto error; |
| 793 | } |
| 794 | *start = search_start; |
| 795 | start_found = 1; |
| 796 | goto check_pending; |
| 797 | } |
| 798 | *start = last_byte > search_start ? |
| 799 | last_byte : search_start; |
| 800 | if (search_end <= *start) { |
| 801 | ret = -ENOSPC; |
| 802 | goto error; |
| 803 | } |
| 804 | goto check_pending; |
| 805 | } |
| 806 | btrfs_item_key_to_cpu(l, &key, slot); |
| 807 | |
| 808 | if (key.objectid < device->devid) |
| 809 | goto next; |
| 810 | |
| 811 | if (key.objectid > device->devid) |
| 812 | goto no_more_items; |
| 813 | |
| 814 | if (key.offset >= search_start && key.offset > last_byte && |
| 815 | start_found) { |
| 816 | if (last_byte < search_start) |
| 817 | last_byte = search_start; |
| 818 | hole_size = key.offset - last_byte; |
Chris Mason | 9779b72 | 2009-07-24 16:41:41 -0400 | [diff] [blame] | 819 | |
| 820 | if (hole_size > *max_avail) |
| 821 | *max_avail = hole_size; |
| 822 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 823 | if (key.offset > last_byte && |
| 824 | hole_size >= num_bytes) { |
| 825 | *start = last_byte; |
| 826 | goto check_pending; |
| 827 | } |
| 828 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 829 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 830 | goto next; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 831 | |
| 832 | start_found = 1; |
| 833 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
| 834 | last_byte = key.offset + btrfs_dev_extent_length(l, dev_extent); |
| 835 | next: |
| 836 | path->slots[0]++; |
| 837 | cond_resched(); |
| 838 | } |
| 839 | check_pending: |
| 840 | /* we have to make sure we didn't find an extent that has already |
| 841 | * been allocated by the map tree or the original allocation |
| 842 | */ |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 843 | BUG_ON(*start < search_start); |
| 844 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 845 | if (*start + num_bytes > search_end) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 846 | ret = -ENOSPC; |
| 847 | goto error; |
| 848 | } |
| 849 | /* check for pending inserts here */ |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 850 | ret = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 851 | |
| 852 | error: |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 853 | btrfs_free_path(path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 854 | return ret; |
| 855 | } |
| 856 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 857 | static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 858 | struct btrfs_device *device, |
| 859 | u64 start) |
| 860 | { |
| 861 | int ret; |
| 862 | struct btrfs_path *path; |
| 863 | struct btrfs_root *root = device->dev_root; |
| 864 | struct btrfs_key key; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 865 | struct btrfs_key found_key; |
| 866 | struct extent_buffer *leaf = NULL; |
| 867 | struct btrfs_dev_extent *extent = NULL; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 868 | |
| 869 | path = btrfs_alloc_path(); |
| 870 | if (!path) |
| 871 | return -ENOMEM; |
| 872 | |
| 873 | key.objectid = device->devid; |
| 874 | key.offset = start; |
| 875 | key.type = BTRFS_DEV_EXTENT_KEY; |
| 876 | |
| 877 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 878 | if (ret > 0) { |
| 879 | ret = btrfs_previous_item(root, path, key.objectid, |
| 880 | BTRFS_DEV_EXTENT_KEY); |
| 881 | BUG_ON(ret); |
| 882 | leaf = path->nodes[0]; |
| 883 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 884 | extent = btrfs_item_ptr(leaf, path->slots[0], |
| 885 | struct btrfs_dev_extent); |
| 886 | BUG_ON(found_key.offset > start || found_key.offset + |
| 887 | btrfs_dev_extent_length(leaf, extent) < start); |
| 888 | ret = 0; |
| 889 | } else if (ret == 0) { |
| 890 | leaf = path->nodes[0]; |
| 891 | extent = btrfs_item_ptr(leaf, path->slots[0], |
| 892 | struct btrfs_dev_extent); |
| 893 | } |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 894 | BUG_ON(ret); |
| 895 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 896 | if (device->bytes_used > 0) |
| 897 | device->bytes_used -= btrfs_dev_extent_length(leaf, extent); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 898 | ret = btrfs_del_item(trans, root, path); |
| 899 | BUG_ON(ret); |
| 900 | |
| 901 | btrfs_free_path(path); |
| 902 | return ret; |
| 903 | } |
| 904 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 905 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 906 | struct btrfs_device *device, |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 907 | u64 chunk_tree, u64 chunk_objectid, |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 908 | u64 chunk_offset, u64 start, u64 num_bytes) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 909 | { |
| 910 | int ret; |
| 911 | struct btrfs_path *path; |
| 912 | struct btrfs_root *root = device->dev_root; |
| 913 | struct btrfs_dev_extent *extent; |
| 914 | struct extent_buffer *leaf; |
| 915 | struct btrfs_key key; |
| 916 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 917 | WARN_ON(!device->in_fs_metadata); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 918 | path = btrfs_alloc_path(); |
| 919 | if (!path) |
| 920 | return -ENOMEM; |
| 921 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 922 | key.objectid = device->devid; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 923 | key.offset = start; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 924 | key.type = BTRFS_DEV_EXTENT_KEY; |
| 925 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 926 | sizeof(*extent)); |
| 927 | BUG_ON(ret); |
| 928 | |
| 929 | leaf = path->nodes[0]; |
| 930 | extent = btrfs_item_ptr(leaf, path->slots[0], |
| 931 | struct btrfs_dev_extent); |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 932 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
| 933 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); |
| 934 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); |
| 935 | |
| 936 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
| 937 | (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent), |
| 938 | BTRFS_UUID_SIZE); |
| 939 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 940 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
| 941 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 942 | btrfs_free_path(path); |
| 943 | return ret; |
| 944 | } |
| 945 | |
Chris Mason | a1b32a5 | 2008-09-05 16:09:51 -0400 | [diff] [blame] | 946 | static noinline int find_next_chunk(struct btrfs_root *root, |
| 947 | u64 objectid, u64 *offset) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 948 | { |
| 949 | struct btrfs_path *path; |
| 950 | int ret; |
| 951 | struct btrfs_key key; |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 952 | struct btrfs_chunk *chunk; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 953 | struct btrfs_key found_key; |
| 954 | |
| 955 | path = btrfs_alloc_path(); |
| 956 | BUG_ON(!path); |
| 957 | |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 958 | key.objectid = objectid; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 959 | key.offset = (u64)-1; |
| 960 | key.type = BTRFS_CHUNK_ITEM_KEY; |
| 961 | |
| 962 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 963 | if (ret < 0) |
| 964 | goto error; |
| 965 | |
| 966 | BUG_ON(ret == 0); |
| 967 | |
| 968 | ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY); |
| 969 | if (ret) { |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 970 | *offset = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 971 | } else { |
| 972 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 973 | path->slots[0]); |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 974 | if (found_key.objectid != objectid) |
| 975 | *offset = 0; |
| 976 | else { |
| 977 | chunk = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 978 | struct btrfs_chunk); |
| 979 | *offset = found_key.offset + |
| 980 | btrfs_chunk_length(path->nodes[0], chunk); |
| 981 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 982 | } |
| 983 | ret = 0; |
| 984 | error: |
| 985 | btrfs_free_path(path); |
| 986 | return ret; |
| 987 | } |
| 988 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 989 | static noinline int find_next_devid(struct btrfs_root *root, u64 *objectid) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 990 | { |
| 991 | int ret; |
| 992 | struct btrfs_key key; |
| 993 | struct btrfs_key found_key; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 994 | struct btrfs_path *path; |
| 995 | |
| 996 | root = root->fs_info->chunk_root; |
| 997 | |
| 998 | path = btrfs_alloc_path(); |
| 999 | if (!path) |
| 1000 | return -ENOMEM; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1001 | |
| 1002 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
| 1003 | key.type = BTRFS_DEV_ITEM_KEY; |
| 1004 | key.offset = (u64)-1; |
| 1005 | |
| 1006 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 1007 | if (ret < 0) |
| 1008 | goto error; |
| 1009 | |
| 1010 | BUG_ON(ret == 0); |
| 1011 | |
| 1012 | ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID, |
| 1013 | BTRFS_DEV_ITEM_KEY); |
| 1014 | if (ret) { |
| 1015 | *objectid = 1; |
| 1016 | } else { |
| 1017 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 1018 | path->slots[0]); |
| 1019 | *objectid = found_key.offset + 1; |
| 1020 | } |
| 1021 | ret = 0; |
| 1022 | error: |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1023 | btrfs_free_path(path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1024 | return ret; |
| 1025 | } |
| 1026 | |
| 1027 | /* |
| 1028 | * the device information is stored in the chunk root |
| 1029 | * the btrfs_device struct should be fully filled in |
| 1030 | */ |
| 1031 | int btrfs_add_device(struct btrfs_trans_handle *trans, |
| 1032 | struct btrfs_root *root, |
| 1033 | struct btrfs_device *device) |
| 1034 | { |
| 1035 | int ret; |
| 1036 | struct btrfs_path *path; |
| 1037 | struct btrfs_dev_item *dev_item; |
| 1038 | struct extent_buffer *leaf; |
| 1039 | struct btrfs_key key; |
| 1040 | unsigned long ptr; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1041 | |
| 1042 | root = root->fs_info->chunk_root; |
| 1043 | |
| 1044 | path = btrfs_alloc_path(); |
| 1045 | if (!path) |
| 1046 | return -ENOMEM; |
| 1047 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1048 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
| 1049 | key.type = BTRFS_DEV_ITEM_KEY; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1050 | key.offset = device->devid; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1051 | |
| 1052 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
Chris Mason | 0d81ba5 | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1053 | sizeof(*dev_item)); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1054 | if (ret) |
| 1055 | goto out; |
| 1056 | |
| 1057 | leaf = path->nodes[0]; |
| 1058 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); |
| 1059 | |
| 1060 | btrfs_set_device_id(leaf, dev_item, device->devid); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1061 | btrfs_set_device_generation(leaf, dev_item, 0); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1062 | btrfs_set_device_type(leaf, dev_item, device->type); |
| 1063 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); |
| 1064 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); |
| 1065 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1066 | btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); |
| 1067 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 1068 | btrfs_set_device_group(leaf, dev_item, 0); |
| 1069 | btrfs_set_device_seek_speed(leaf, dev_item, 0); |
| 1070 | btrfs_set_device_bandwidth(leaf, dev_item, 0); |
Chris Mason | c3027eb | 2008-12-08 16:40:21 -0500 | [diff] [blame] | 1071 | btrfs_set_device_start_offset(leaf, dev_item, 0); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1072 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1073 | ptr = (unsigned long)btrfs_device_uuid(dev_item); |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 1074 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1075 | ptr = (unsigned long)btrfs_device_fsid(dev_item); |
| 1076 | write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1077 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1078 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1079 | ret = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1080 | out: |
| 1081 | btrfs_free_path(path); |
| 1082 | return ret; |
| 1083 | } |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1084 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1085 | static int btrfs_rm_dev_item(struct btrfs_root *root, |
| 1086 | struct btrfs_device *device) |
| 1087 | { |
| 1088 | int ret; |
| 1089 | struct btrfs_path *path; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1090 | struct btrfs_key key; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1091 | struct btrfs_trans_handle *trans; |
| 1092 | |
| 1093 | root = root->fs_info->chunk_root; |
| 1094 | |
| 1095 | path = btrfs_alloc_path(); |
| 1096 | if (!path) |
| 1097 | return -ENOMEM; |
| 1098 | |
| 1099 | trans = btrfs_start_transaction(root, 1); |
| 1100 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
| 1101 | key.type = BTRFS_DEV_ITEM_KEY; |
| 1102 | key.offset = device->devid; |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1103 | lock_chunks(root); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1104 | |
| 1105 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1106 | if (ret < 0) |
| 1107 | goto out; |
| 1108 | |
| 1109 | if (ret > 0) { |
| 1110 | ret = -ENOENT; |
| 1111 | goto out; |
| 1112 | } |
| 1113 | |
| 1114 | ret = btrfs_del_item(trans, root, path); |
| 1115 | if (ret) |
| 1116 | goto out; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1117 | out: |
| 1118 | btrfs_free_path(path); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1119 | unlock_chunks(root); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1120 | btrfs_commit_transaction(trans, root); |
| 1121 | return ret; |
| 1122 | } |
| 1123 | |
| 1124 | int btrfs_rm_device(struct btrfs_root *root, char *device_path) |
| 1125 | { |
| 1126 | struct btrfs_device *device; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1127 | struct btrfs_device *next_device; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1128 | struct block_device *bdev; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1129 | struct buffer_head *bh = NULL; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1130 | struct btrfs_super_block *disk_super; |
| 1131 | u64 all_avail; |
| 1132 | u64 devid; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1133 | u64 num_devices; |
| 1134 | u8 *dev_uuid; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1135 | int ret = 0; |
| 1136 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1137 | mutex_lock(&uuid_mutex); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1138 | mutex_lock(&root->fs_info->volume_mutex); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1139 | |
| 1140 | all_avail = root->fs_info->avail_data_alloc_bits | |
| 1141 | root->fs_info->avail_system_alloc_bits | |
| 1142 | root->fs_info->avail_metadata_alloc_bits; |
| 1143 | |
| 1144 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && |
Josef Bacik | 035fe03 | 2010-01-27 02:09:38 +0000 | [diff] [blame] | 1145 | root->fs_info->fs_devices->num_devices <= 4) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1146 | printk(KERN_ERR "btrfs: unable to go below four devices " |
| 1147 | "on raid10\n"); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1148 | ret = -EINVAL; |
| 1149 | goto out; |
| 1150 | } |
| 1151 | |
| 1152 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && |
Josef Bacik | 035fe03 | 2010-01-27 02:09:38 +0000 | [diff] [blame] | 1153 | root->fs_info->fs_devices->num_devices <= 2) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1154 | printk(KERN_ERR "btrfs: unable to go below two " |
| 1155 | "devices on raid1\n"); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1156 | ret = -EINVAL; |
| 1157 | goto out; |
| 1158 | } |
| 1159 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1160 | if (strcmp(device_path, "missing") == 0) { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1161 | struct list_head *devices; |
| 1162 | struct btrfs_device *tmp; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1163 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1164 | device = NULL; |
| 1165 | devices = &root->fs_info->fs_devices->devices; |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 1166 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 1167 | list_for_each_entry(tmp, devices, dev_list) { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1168 | if (tmp->in_fs_metadata && !tmp->bdev) { |
| 1169 | device = tmp; |
| 1170 | break; |
| 1171 | } |
| 1172 | } |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 1173 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1174 | bdev = NULL; |
| 1175 | bh = NULL; |
| 1176 | disk_super = NULL; |
| 1177 | if (!device) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1178 | printk(KERN_ERR "btrfs: no missing devices found to " |
| 1179 | "remove\n"); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1180 | goto out; |
| 1181 | } |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1182 | } else { |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1183 | bdev = open_bdev_exclusive(device_path, FMODE_READ, |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1184 | root->fs_info->bdev_holder); |
| 1185 | if (IS_ERR(bdev)) { |
| 1186 | ret = PTR_ERR(bdev); |
| 1187 | goto out; |
| 1188 | } |
| 1189 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1190 | set_blocksize(bdev, 4096); |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 1191 | bh = btrfs_read_dev_super(bdev); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1192 | if (!bh) { |
| 1193 | ret = -EIO; |
| 1194 | goto error_close; |
| 1195 | } |
| 1196 | disk_super = (struct btrfs_super_block *)bh->b_data; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1197 | devid = le64_to_cpu(disk_super->dev_item.devid); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1198 | dev_uuid = disk_super->dev_item.uuid; |
| 1199 | device = btrfs_find_device(root, devid, dev_uuid, |
| 1200 | disk_super->fsid); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1201 | if (!device) { |
| 1202 | ret = -ENOENT; |
| 1203 | goto error_brelse; |
| 1204 | } |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1205 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1206 | |
| 1207 | if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1208 | printk(KERN_ERR "btrfs: unable to remove the only writeable " |
| 1209 | "device\n"); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1210 | ret = -EINVAL; |
| 1211 | goto error_brelse; |
| 1212 | } |
| 1213 | |
| 1214 | if (device->writeable) { |
| 1215 | list_del_init(&device->dev_alloc_list); |
| 1216 | root->fs_info->fs_devices->rw_devices--; |
| 1217 | } |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1218 | |
| 1219 | ret = btrfs_shrink_device(device, 0); |
| 1220 | if (ret) |
| 1221 | goto error_brelse; |
| 1222 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1223 | ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device); |
| 1224 | if (ret) |
| 1225 | goto error_brelse; |
| 1226 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1227 | device->in_fs_metadata = 0; |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 1228 | |
| 1229 | /* |
| 1230 | * the device list mutex makes sure that we don't change |
| 1231 | * the device list while someone else is writing out all |
| 1232 | * the device supers. |
| 1233 | */ |
| 1234 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1235 | list_del_init(&device->dev_list); |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 1236 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 1237 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1238 | device->fs_devices->num_devices--; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1239 | |
| 1240 | next_device = list_entry(root->fs_info->fs_devices->devices.next, |
| 1241 | struct btrfs_device, dev_list); |
| 1242 | if (device->bdev == root->fs_info->sb->s_bdev) |
| 1243 | root->fs_info->sb->s_bdev = next_device->bdev; |
| 1244 | if (device->bdev == root->fs_info->fs_devices->latest_bdev) |
| 1245 | root->fs_info->fs_devices->latest_bdev = next_device->bdev; |
| 1246 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1247 | if (device->bdev) { |
| 1248 | close_bdev_exclusive(device->bdev, device->mode); |
| 1249 | device->bdev = NULL; |
| 1250 | device->fs_devices->open_devices--; |
| 1251 | } |
| 1252 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1253 | num_devices = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; |
| 1254 | btrfs_set_super_num_devices(&root->fs_info->super_copy, num_devices); |
| 1255 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1256 | if (device->fs_devices->open_devices == 0) { |
| 1257 | struct btrfs_fs_devices *fs_devices; |
| 1258 | fs_devices = root->fs_info->fs_devices; |
| 1259 | while (fs_devices) { |
| 1260 | if (fs_devices->seed == device->fs_devices) |
| 1261 | break; |
| 1262 | fs_devices = fs_devices->seed; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1263 | } |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1264 | fs_devices->seed = device->fs_devices->seed; |
| 1265 | device->fs_devices->seed = NULL; |
| 1266 | __btrfs_close_devices(device->fs_devices); |
| 1267 | free_fs_devices(device->fs_devices); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1268 | } |
| 1269 | |
| 1270 | /* |
| 1271 | * at this point, the device is zero sized. We want to |
| 1272 | * remove it from the devices list and zero out the old super |
| 1273 | */ |
| 1274 | if (device->writeable) { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1275 | /* make sure this device isn't detected as part of |
| 1276 | * the FS anymore |
| 1277 | */ |
| 1278 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); |
| 1279 | set_buffer_dirty(bh); |
| 1280 | sync_dirty_buffer(bh); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1281 | } |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1282 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1283 | kfree(device->name); |
| 1284 | kfree(device); |
| 1285 | ret = 0; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1286 | |
| 1287 | error_brelse: |
| 1288 | brelse(bh); |
| 1289 | error_close: |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1290 | if (bdev) |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1291 | close_bdev_exclusive(bdev, FMODE_READ); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1292 | out: |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1293 | mutex_unlock(&root->fs_info->volume_mutex); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1294 | mutex_unlock(&uuid_mutex); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1295 | return ret; |
| 1296 | } |
| 1297 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1298 | /* |
| 1299 | * does all the dirty work required for changing file system's UUID. |
| 1300 | */ |
| 1301 | static int btrfs_prepare_sprout(struct btrfs_trans_handle *trans, |
| 1302 | struct btrfs_root *root) |
| 1303 | { |
| 1304 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
| 1305 | struct btrfs_fs_devices *old_devices; |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1306 | struct btrfs_fs_devices *seed_devices; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1307 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
| 1308 | struct btrfs_device *device; |
| 1309 | u64 super_flags; |
| 1310 | |
| 1311 | BUG_ON(!mutex_is_locked(&uuid_mutex)); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1312 | if (!fs_devices->seeding) |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1313 | return -EINVAL; |
| 1314 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1315 | seed_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
| 1316 | if (!seed_devices) |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1317 | return -ENOMEM; |
| 1318 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1319 | old_devices = clone_fs_devices(fs_devices); |
| 1320 | if (IS_ERR(old_devices)) { |
| 1321 | kfree(seed_devices); |
| 1322 | return PTR_ERR(old_devices); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1323 | } |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1324 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1325 | list_add(&old_devices->list, &fs_uuids); |
| 1326 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1327 | memcpy(seed_devices, fs_devices, sizeof(*seed_devices)); |
| 1328 | seed_devices->opened = 1; |
| 1329 | INIT_LIST_HEAD(&seed_devices->devices); |
| 1330 | INIT_LIST_HEAD(&seed_devices->alloc_list); |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 1331 | mutex_init(&seed_devices->device_list_mutex); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1332 | list_splice_init(&fs_devices->devices, &seed_devices->devices); |
| 1333 | list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); |
| 1334 | list_for_each_entry(device, &seed_devices->devices, dev_list) { |
| 1335 | device->fs_devices = seed_devices; |
| 1336 | } |
| 1337 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1338 | fs_devices->seeding = 0; |
| 1339 | fs_devices->num_devices = 0; |
| 1340 | fs_devices->open_devices = 0; |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 1341 | fs_devices->seed = seed_devices; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1342 | |
| 1343 | generate_random_uuid(fs_devices->fsid); |
| 1344 | memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); |
| 1345 | memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); |
| 1346 | super_flags = btrfs_super_flags(disk_super) & |
| 1347 | ~BTRFS_SUPER_FLAG_SEEDING; |
| 1348 | btrfs_set_super_flags(disk_super, super_flags); |
| 1349 | |
| 1350 | return 0; |
| 1351 | } |
| 1352 | |
| 1353 | /* |
| 1354 | * strore the expected generation for seed devices in device items. |
| 1355 | */ |
| 1356 | static int btrfs_finish_sprout(struct btrfs_trans_handle *trans, |
| 1357 | struct btrfs_root *root) |
| 1358 | { |
| 1359 | struct btrfs_path *path; |
| 1360 | struct extent_buffer *leaf; |
| 1361 | struct btrfs_dev_item *dev_item; |
| 1362 | struct btrfs_device *device; |
| 1363 | struct btrfs_key key; |
| 1364 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
| 1365 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
| 1366 | u64 devid; |
| 1367 | int ret; |
| 1368 | |
| 1369 | path = btrfs_alloc_path(); |
| 1370 | if (!path) |
| 1371 | return -ENOMEM; |
| 1372 | |
| 1373 | root = root->fs_info->chunk_root; |
| 1374 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
| 1375 | key.offset = 0; |
| 1376 | key.type = BTRFS_DEV_ITEM_KEY; |
| 1377 | |
| 1378 | while (1) { |
| 1379 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 1380 | if (ret < 0) |
| 1381 | goto error; |
| 1382 | |
| 1383 | leaf = path->nodes[0]; |
| 1384 | next_slot: |
| 1385 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 1386 | ret = btrfs_next_leaf(root, path); |
| 1387 | if (ret > 0) |
| 1388 | break; |
| 1389 | if (ret < 0) |
| 1390 | goto error; |
| 1391 | leaf = path->nodes[0]; |
| 1392 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1393 | btrfs_release_path(root, path); |
| 1394 | continue; |
| 1395 | } |
| 1396 | |
| 1397 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 1398 | if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID || |
| 1399 | key.type != BTRFS_DEV_ITEM_KEY) |
| 1400 | break; |
| 1401 | |
| 1402 | dev_item = btrfs_item_ptr(leaf, path->slots[0], |
| 1403 | struct btrfs_dev_item); |
| 1404 | devid = btrfs_device_id(leaf, dev_item); |
| 1405 | read_extent_buffer(leaf, dev_uuid, |
| 1406 | (unsigned long)btrfs_device_uuid(dev_item), |
| 1407 | BTRFS_UUID_SIZE); |
| 1408 | read_extent_buffer(leaf, fs_uuid, |
| 1409 | (unsigned long)btrfs_device_fsid(dev_item), |
| 1410 | BTRFS_UUID_SIZE); |
| 1411 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); |
| 1412 | BUG_ON(!device); |
| 1413 | |
| 1414 | if (device->fs_devices->seeding) { |
| 1415 | btrfs_set_device_generation(leaf, dev_item, |
| 1416 | device->generation); |
| 1417 | btrfs_mark_buffer_dirty(leaf); |
| 1418 | } |
| 1419 | |
| 1420 | path->slots[0]++; |
| 1421 | goto next_slot; |
| 1422 | } |
| 1423 | ret = 0; |
| 1424 | error: |
| 1425 | btrfs_free_path(path); |
| 1426 | return ret; |
| 1427 | } |
| 1428 | |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1429 | int btrfs_init_new_device(struct btrfs_root *root, char *device_path) |
| 1430 | { |
| 1431 | struct btrfs_trans_handle *trans; |
| 1432 | struct btrfs_device *device; |
| 1433 | struct block_device *bdev; |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1434 | struct list_head *devices; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1435 | struct super_block *sb = root->fs_info->sb; |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1436 | u64 total_bytes; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1437 | int seeding_dev = 0; |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1438 | int ret = 0; |
| 1439 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1440 | if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding) |
| 1441 | return -EINVAL; |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1442 | |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1443 | bdev = open_bdev_exclusive(device_path, 0, root->fs_info->bdev_holder); |
Josef Bacik | 7f59203 | 2010-01-27 02:09:00 +0000 | [diff] [blame] | 1444 | if (IS_ERR(bdev)) |
| 1445 | return PTR_ERR(bdev); |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1446 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1447 | if (root->fs_info->fs_devices->seeding) { |
| 1448 | seeding_dev = 1; |
| 1449 | down_write(&sb->s_umount); |
| 1450 | mutex_lock(&uuid_mutex); |
| 1451 | } |
| 1452 | |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 1453 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1454 | mutex_lock(&root->fs_info->volume_mutex); |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1455 | |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1456 | devices = &root->fs_info->fs_devices->devices; |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 1457 | /* |
| 1458 | * we have the volume lock, so we don't need the extra |
| 1459 | * device list mutex while reading the list here. |
| 1460 | */ |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 1461 | list_for_each_entry(device, devices, dev_list) { |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1462 | if (device->bdev == bdev) { |
| 1463 | ret = -EEXIST; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1464 | goto error; |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1465 | } |
| 1466 | } |
| 1467 | |
| 1468 | device = kzalloc(sizeof(*device), GFP_NOFS); |
| 1469 | if (!device) { |
| 1470 | /* we can safely leave the fs_devices entry around */ |
| 1471 | ret = -ENOMEM; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1472 | goto error; |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1473 | } |
| 1474 | |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1475 | device->name = kstrdup(device_path, GFP_NOFS); |
| 1476 | if (!device->name) { |
| 1477 | kfree(device); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1478 | ret = -ENOMEM; |
| 1479 | goto error; |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1480 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1481 | |
| 1482 | ret = find_next_devid(root, &device->devid); |
| 1483 | if (ret) { |
| 1484 | kfree(device); |
| 1485 | goto error; |
| 1486 | } |
| 1487 | |
| 1488 | trans = btrfs_start_transaction(root, 1); |
| 1489 | lock_chunks(root); |
| 1490 | |
| 1491 | device->barriers = 1; |
| 1492 | device->writeable = 1; |
| 1493 | device->work.func = pending_bios_fn; |
| 1494 | generate_random_uuid(device->uuid); |
| 1495 | spin_lock_init(&device->io_lock); |
| 1496 | device->generation = trans->transid; |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1497 | device->io_width = root->sectorsize; |
| 1498 | device->io_align = root->sectorsize; |
| 1499 | device->sector_size = root->sectorsize; |
| 1500 | device->total_bytes = i_size_read(bdev->bd_inode); |
Yan Zheng | 2cc3c55 | 2009-06-04 09:23:50 -0400 | [diff] [blame] | 1501 | device->disk_total_bytes = device->total_bytes; |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1502 | device->dev_root = root->fs_info->dev_root; |
| 1503 | device->bdev = bdev; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1504 | device->in_fs_metadata = 1; |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1505 | device->mode = 0; |
Zheng Yan | 325cd4b | 2008-09-05 16:43:54 -0400 | [diff] [blame] | 1506 | set_blocksize(device->bdev, 4096); |
| 1507 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1508 | if (seeding_dev) { |
| 1509 | sb->s_flags &= ~MS_RDONLY; |
| 1510 | ret = btrfs_prepare_sprout(trans, root); |
| 1511 | BUG_ON(ret); |
| 1512 | } |
| 1513 | |
| 1514 | device->fs_devices = root->fs_info->fs_devices; |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 1515 | |
| 1516 | /* |
| 1517 | * we don't want write_supers to jump in here with our device |
| 1518 | * half setup |
| 1519 | */ |
| 1520 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1521 | list_add(&device->dev_list, &root->fs_info->fs_devices->devices); |
| 1522 | list_add(&device->dev_alloc_list, |
| 1523 | &root->fs_info->fs_devices->alloc_list); |
| 1524 | root->fs_info->fs_devices->num_devices++; |
| 1525 | root->fs_info->fs_devices->open_devices++; |
| 1526 | root->fs_info->fs_devices->rw_devices++; |
| 1527 | root->fs_info->fs_devices->total_rw_bytes += device->total_bytes; |
| 1528 | |
Chris Mason | c289811 | 2009-06-10 09:51:32 -0400 | [diff] [blame] | 1529 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
| 1530 | root->fs_info->fs_devices->rotating = 1; |
| 1531 | |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1532 | total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
| 1533 | btrfs_set_super_total_bytes(&root->fs_info->super_copy, |
| 1534 | total_bytes + device->total_bytes); |
| 1535 | |
| 1536 | total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy); |
| 1537 | btrfs_set_super_num_devices(&root->fs_info->super_copy, |
| 1538 | total_bytes + 1); |
Chris Mason | e5e9a52 | 2009-06-10 15:17:02 -0400 | [diff] [blame] | 1539 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1540 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1541 | if (seeding_dev) { |
| 1542 | ret = init_first_rw_device(trans, root, device); |
| 1543 | BUG_ON(ret); |
| 1544 | ret = btrfs_finish_sprout(trans, root); |
| 1545 | BUG_ON(ret); |
| 1546 | } else { |
| 1547 | ret = btrfs_add_device(trans, root, device); |
| 1548 | } |
| 1549 | |
Chris Mason | 913d952 | 2009-03-10 13:17:18 -0400 | [diff] [blame] | 1550 | /* |
| 1551 | * we've got more storage, clear any full flags on the space |
| 1552 | * infos |
| 1553 | */ |
| 1554 | btrfs_clear_space_info_full(root->fs_info); |
| 1555 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1556 | unlock_chunks(root); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1557 | btrfs_commit_transaction(trans, root); |
| 1558 | |
| 1559 | if (seeding_dev) { |
| 1560 | mutex_unlock(&uuid_mutex); |
| 1561 | up_write(&sb->s_umount); |
| 1562 | |
| 1563 | ret = btrfs_relocate_sys_chunks(root); |
| 1564 | BUG_ON(ret); |
| 1565 | } |
| 1566 | out: |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1567 | mutex_unlock(&root->fs_info->volume_mutex); |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1568 | return ret; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1569 | error: |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 1570 | close_bdev_exclusive(bdev, 0); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1571 | if (seeding_dev) { |
| 1572 | mutex_unlock(&uuid_mutex); |
| 1573 | up_write(&sb->s_umount); |
| 1574 | } |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 1575 | goto out; |
| 1576 | } |
| 1577 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1578 | static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, |
| 1579 | struct btrfs_device *device) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1580 | { |
| 1581 | int ret; |
| 1582 | struct btrfs_path *path; |
| 1583 | struct btrfs_root *root; |
| 1584 | struct btrfs_dev_item *dev_item; |
| 1585 | struct extent_buffer *leaf; |
| 1586 | struct btrfs_key key; |
| 1587 | |
| 1588 | root = device->dev_root->fs_info->chunk_root; |
| 1589 | |
| 1590 | path = btrfs_alloc_path(); |
| 1591 | if (!path) |
| 1592 | return -ENOMEM; |
| 1593 | |
| 1594 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
| 1595 | key.type = BTRFS_DEV_ITEM_KEY; |
| 1596 | key.offset = device->devid; |
| 1597 | |
| 1598 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 1599 | if (ret < 0) |
| 1600 | goto out; |
| 1601 | |
| 1602 | if (ret > 0) { |
| 1603 | ret = -ENOENT; |
| 1604 | goto out; |
| 1605 | } |
| 1606 | |
| 1607 | leaf = path->nodes[0]; |
| 1608 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); |
| 1609 | |
| 1610 | btrfs_set_device_id(leaf, dev_item, device->devid); |
| 1611 | btrfs_set_device_type(leaf, dev_item, device->type); |
| 1612 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); |
| 1613 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); |
| 1614 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); |
Chris Ball | d6397ba | 2009-04-27 07:29:03 -0400 | [diff] [blame] | 1615 | btrfs_set_device_total_bytes(leaf, dev_item, device->disk_total_bytes); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1616 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); |
| 1617 | btrfs_mark_buffer_dirty(leaf); |
| 1618 | |
| 1619 | out: |
| 1620 | btrfs_free_path(path); |
| 1621 | return ret; |
| 1622 | } |
| 1623 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1624 | static int __btrfs_grow_device(struct btrfs_trans_handle *trans, |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1625 | struct btrfs_device *device, u64 new_size) |
| 1626 | { |
| 1627 | struct btrfs_super_block *super_copy = |
| 1628 | &device->dev_root->fs_info->super_copy; |
| 1629 | u64 old_total = btrfs_super_total_bytes(super_copy); |
| 1630 | u64 diff = new_size - device->total_bytes; |
| 1631 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1632 | if (!device->writeable) |
| 1633 | return -EACCES; |
| 1634 | if (new_size <= device->total_bytes) |
| 1635 | return -EINVAL; |
| 1636 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1637 | btrfs_set_super_total_bytes(super_copy, old_total + diff); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1638 | device->fs_devices->total_rw_bytes += diff; |
| 1639 | |
| 1640 | device->total_bytes = new_size; |
Chris Mason | 9779b72 | 2009-07-24 16:41:41 -0400 | [diff] [blame] | 1641 | device->disk_total_bytes = new_size; |
Chris Mason | 4184ea7 | 2009-03-10 12:39:20 -0400 | [diff] [blame] | 1642 | btrfs_clear_space_info_full(device->dev_root->fs_info); |
| 1643 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1644 | return btrfs_update_device(trans, device); |
| 1645 | } |
| 1646 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1647 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
| 1648 | struct btrfs_device *device, u64 new_size) |
| 1649 | { |
| 1650 | int ret; |
| 1651 | lock_chunks(device->dev_root); |
| 1652 | ret = __btrfs_grow_device(trans, device, new_size); |
| 1653 | unlock_chunks(device->dev_root); |
| 1654 | return ret; |
| 1655 | } |
| 1656 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1657 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, |
| 1658 | struct btrfs_root *root, |
| 1659 | u64 chunk_tree, u64 chunk_objectid, |
| 1660 | u64 chunk_offset) |
| 1661 | { |
| 1662 | int ret; |
| 1663 | struct btrfs_path *path; |
| 1664 | struct btrfs_key key; |
| 1665 | |
| 1666 | root = root->fs_info->chunk_root; |
| 1667 | path = btrfs_alloc_path(); |
| 1668 | if (!path) |
| 1669 | return -ENOMEM; |
| 1670 | |
| 1671 | key.objectid = chunk_objectid; |
| 1672 | key.offset = chunk_offset; |
| 1673 | key.type = BTRFS_CHUNK_ITEM_KEY; |
| 1674 | |
| 1675 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1676 | BUG_ON(ret); |
| 1677 | |
| 1678 | ret = btrfs_del_item(trans, root, path); |
| 1679 | BUG_ON(ret); |
| 1680 | |
| 1681 | btrfs_free_path(path); |
| 1682 | return 0; |
| 1683 | } |
| 1684 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1685 | static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1686 | chunk_offset) |
| 1687 | { |
| 1688 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; |
| 1689 | struct btrfs_disk_key *disk_key; |
| 1690 | struct btrfs_chunk *chunk; |
| 1691 | u8 *ptr; |
| 1692 | int ret = 0; |
| 1693 | u32 num_stripes; |
| 1694 | u32 array_size; |
| 1695 | u32 len = 0; |
| 1696 | u32 cur; |
| 1697 | struct btrfs_key key; |
| 1698 | |
| 1699 | array_size = btrfs_super_sys_array_size(super_copy); |
| 1700 | |
| 1701 | ptr = super_copy->sys_chunk_array; |
| 1702 | cur = 0; |
| 1703 | |
| 1704 | while (cur < array_size) { |
| 1705 | disk_key = (struct btrfs_disk_key *)ptr; |
| 1706 | btrfs_disk_key_to_cpu(&key, disk_key); |
| 1707 | |
| 1708 | len = sizeof(*disk_key); |
| 1709 | |
| 1710 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
| 1711 | chunk = (struct btrfs_chunk *)(ptr + len); |
| 1712 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); |
| 1713 | len += btrfs_chunk_item_size(num_stripes); |
| 1714 | } else { |
| 1715 | ret = -EIO; |
| 1716 | break; |
| 1717 | } |
| 1718 | if (key.objectid == chunk_objectid && |
| 1719 | key.offset == chunk_offset) { |
| 1720 | memmove(ptr, ptr + len, array_size - (cur + len)); |
| 1721 | array_size -= len; |
| 1722 | btrfs_set_super_sys_array_size(super_copy, array_size); |
| 1723 | } else { |
| 1724 | ptr += len; |
| 1725 | cur += len; |
| 1726 | } |
| 1727 | } |
| 1728 | return ret; |
| 1729 | } |
| 1730 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1731 | static int btrfs_relocate_chunk(struct btrfs_root *root, |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1732 | u64 chunk_tree, u64 chunk_objectid, |
| 1733 | u64 chunk_offset) |
| 1734 | { |
| 1735 | struct extent_map_tree *em_tree; |
| 1736 | struct btrfs_root *extent_root; |
| 1737 | struct btrfs_trans_handle *trans; |
| 1738 | struct extent_map *em; |
| 1739 | struct map_lookup *map; |
| 1740 | int ret; |
| 1741 | int i; |
| 1742 | |
| 1743 | root = root->fs_info->chunk_root; |
| 1744 | extent_root = root->fs_info->extent_root; |
| 1745 | em_tree = &root->fs_info->mapping_tree.map_tree; |
| 1746 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1747 | ret = btrfs_can_relocate(extent_root, chunk_offset); |
| 1748 | if (ret) |
| 1749 | return -ENOSPC; |
| 1750 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1751 | /* step one, relocate all the extents inside this chunk */ |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 1752 | ret = btrfs_relocate_block_group(extent_root, chunk_offset); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1753 | BUG_ON(ret); |
| 1754 | |
| 1755 | trans = btrfs_start_transaction(root, 1); |
| 1756 | BUG_ON(!trans); |
| 1757 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1758 | lock_chunks(root); |
| 1759 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1760 | /* |
| 1761 | * step two, delete the device extents and the |
| 1762 | * chunk tree entries |
| 1763 | */ |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 1764 | read_lock(&em_tree->lock); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1765 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 1766 | read_unlock(&em_tree->lock); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1767 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1768 | BUG_ON(em->start > chunk_offset || |
| 1769 | em->start + em->len < chunk_offset); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1770 | map = (struct map_lookup *)em->bdev; |
| 1771 | |
| 1772 | for (i = 0; i < map->num_stripes; i++) { |
| 1773 | ret = btrfs_free_dev_extent(trans, map->stripes[i].dev, |
| 1774 | map->stripes[i].physical); |
| 1775 | BUG_ON(ret); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1776 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1777 | if (map->stripes[i].dev) { |
| 1778 | ret = btrfs_update_device(trans, map->stripes[i].dev); |
| 1779 | BUG_ON(ret); |
| 1780 | } |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1781 | } |
| 1782 | ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid, |
| 1783 | chunk_offset); |
| 1784 | |
| 1785 | BUG_ON(ret); |
| 1786 | |
| 1787 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
| 1788 | ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); |
| 1789 | BUG_ON(ret); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1790 | } |
| 1791 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 1792 | ret = btrfs_remove_block_group(trans, extent_root, chunk_offset); |
| 1793 | BUG_ON(ret); |
| 1794 | |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 1795 | write_lock(&em_tree->lock); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1796 | remove_extent_mapping(em_tree, em); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 1797 | write_unlock(&em_tree->lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 1798 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1799 | kfree(map); |
| 1800 | em->bdev = NULL; |
| 1801 | |
| 1802 | /* once for the tree */ |
| 1803 | free_extent_map(em); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1804 | /* once for us */ |
| 1805 | free_extent_map(em); |
| 1806 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1807 | unlock_chunks(root); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1808 | btrfs_end_transaction(trans, root); |
| 1809 | return 0; |
| 1810 | } |
| 1811 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1812 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root) |
| 1813 | { |
| 1814 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; |
| 1815 | struct btrfs_path *path; |
| 1816 | struct extent_buffer *leaf; |
| 1817 | struct btrfs_chunk *chunk; |
| 1818 | struct btrfs_key key; |
| 1819 | struct btrfs_key found_key; |
| 1820 | u64 chunk_tree = chunk_root->root_key.objectid; |
| 1821 | u64 chunk_type; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1822 | bool retried = false; |
| 1823 | int failed = 0; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1824 | int ret; |
| 1825 | |
| 1826 | path = btrfs_alloc_path(); |
| 1827 | if (!path) |
| 1828 | return -ENOMEM; |
| 1829 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1830 | again: |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1831 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
| 1832 | key.offset = (u64)-1; |
| 1833 | key.type = BTRFS_CHUNK_ITEM_KEY; |
| 1834 | |
| 1835 | while (1) { |
| 1836 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
| 1837 | if (ret < 0) |
| 1838 | goto error; |
| 1839 | BUG_ON(ret == 0); |
| 1840 | |
| 1841 | ret = btrfs_previous_item(chunk_root, path, key.objectid, |
| 1842 | key.type); |
| 1843 | if (ret < 0) |
| 1844 | goto error; |
| 1845 | if (ret > 0) |
| 1846 | break; |
| 1847 | |
| 1848 | leaf = path->nodes[0]; |
| 1849 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 1850 | |
| 1851 | chunk = btrfs_item_ptr(leaf, path->slots[0], |
| 1852 | struct btrfs_chunk); |
| 1853 | chunk_type = btrfs_chunk_type(leaf, chunk); |
| 1854 | btrfs_release_path(chunk_root, path); |
| 1855 | |
| 1856 | if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) { |
| 1857 | ret = btrfs_relocate_chunk(chunk_root, chunk_tree, |
| 1858 | found_key.objectid, |
| 1859 | found_key.offset); |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1860 | if (ret == -ENOSPC) |
| 1861 | failed++; |
| 1862 | else if (ret) |
| 1863 | BUG(); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1864 | } |
| 1865 | |
| 1866 | if (found_key.offset == 0) |
| 1867 | break; |
| 1868 | key.offset = found_key.offset - 1; |
| 1869 | } |
| 1870 | ret = 0; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1871 | if (failed && !retried) { |
| 1872 | failed = 0; |
| 1873 | retried = true; |
| 1874 | goto again; |
| 1875 | } else if (failed && retried) { |
| 1876 | WARN_ON(1); |
| 1877 | ret = -ENOSPC; |
| 1878 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1879 | error: |
| 1880 | btrfs_free_path(path); |
| 1881 | return ret; |
| 1882 | } |
| 1883 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1884 | static u64 div_factor(u64 num, int factor) |
| 1885 | { |
| 1886 | if (factor == 10) |
| 1887 | return num; |
| 1888 | num *= factor; |
| 1889 | do_div(num, 10); |
| 1890 | return num; |
| 1891 | } |
| 1892 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1893 | int btrfs_balance(struct btrfs_root *dev_root) |
| 1894 | { |
| 1895 | int ret; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1896 | struct list_head *devices = &dev_root->fs_info->fs_devices->devices; |
| 1897 | struct btrfs_device *device; |
| 1898 | u64 old_size; |
| 1899 | u64 size_to_free; |
| 1900 | struct btrfs_path *path; |
| 1901 | struct btrfs_key key; |
| 1902 | struct btrfs_chunk *chunk; |
| 1903 | struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root; |
| 1904 | struct btrfs_trans_handle *trans; |
| 1905 | struct btrfs_key found_key; |
| 1906 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1907 | if (dev_root->fs_info->sb->s_flags & MS_RDONLY) |
| 1908 | return -EROFS; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1909 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1910 | mutex_lock(&dev_root->fs_info->volume_mutex); |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1911 | dev_root = dev_root->fs_info->dev_root; |
| 1912 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1913 | /* step one make some room on all the devices */ |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 1914 | list_for_each_entry(device, devices, dev_list) { |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1915 | old_size = device->total_bytes; |
| 1916 | size_to_free = div_factor(old_size, 1); |
| 1917 | size_to_free = min(size_to_free, (u64)1 * 1024 * 1024); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1918 | if (!device->writeable || |
| 1919 | device->total_bytes - device->bytes_used > size_to_free) |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1920 | continue; |
| 1921 | |
| 1922 | ret = btrfs_shrink_device(device, old_size - size_to_free); |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1923 | if (ret == -ENOSPC) |
| 1924 | break; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1925 | BUG_ON(ret); |
| 1926 | |
| 1927 | trans = btrfs_start_transaction(dev_root, 1); |
| 1928 | BUG_ON(!trans); |
| 1929 | |
| 1930 | ret = btrfs_grow_device(trans, device, old_size); |
| 1931 | BUG_ON(ret); |
| 1932 | |
| 1933 | btrfs_end_transaction(trans, dev_root); |
| 1934 | } |
| 1935 | |
| 1936 | /* step two, relocate all the chunks */ |
| 1937 | path = btrfs_alloc_path(); |
| 1938 | BUG_ON(!path); |
| 1939 | |
| 1940 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
| 1941 | key.offset = (u64)-1; |
| 1942 | key.type = BTRFS_CHUNK_ITEM_KEY; |
| 1943 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1944 | while (1) { |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1945 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
| 1946 | if (ret < 0) |
| 1947 | goto error; |
| 1948 | |
| 1949 | /* |
| 1950 | * this shouldn't happen, it means the last relocate |
| 1951 | * failed |
| 1952 | */ |
| 1953 | if (ret == 0) |
| 1954 | break; |
| 1955 | |
| 1956 | ret = btrfs_previous_item(chunk_root, path, 0, |
| 1957 | BTRFS_CHUNK_ITEM_KEY); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1958 | if (ret) |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1959 | break; |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1960 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1961 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 1962 | path->slots[0]); |
| 1963 | if (found_key.objectid != key.objectid) |
| 1964 | break; |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1965 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1966 | chunk = btrfs_item_ptr(path->nodes[0], |
| 1967 | path->slots[0], |
| 1968 | struct btrfs_chunk); |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1969 | /* chunk zero is special */ |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1970 | if (found_key.offset == 0) |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1971 | break; |
| 1972 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1973 | btrfs_release_path(chunk_root, path); |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1974 | ret = btrfs_relocate_chunk(chunk_root, |
| 1975 | chunk_root->root_key.objectid, |
| 1976 | found_key.objectid, |
| 1977 | found_key.offset); |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1978 | BUG_ON(ret && ret != -ENOSPC); |
| 1979 | key.offset = found_key.offset - 1; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1980 | } |
| 1981 | ret = 0; |
| 1982 | error: |
| 1983 | btrfs_free_path(path); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1984 | mutex_unlock(&dev_root->fs_info->volume_mutex); |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1985 | return ret; |
| 1986 | } |
| 1987 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1988 | /* |
| 1989 | * shrinking a device means finding all of the device extents past |
| 1990 | * the new size, and then following the back refs to the chunks. |
| 1991 | * The chunk relocation code actually frees the device extent |
| 1992 | */ |
| 1993 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) |
| 1994 | { |
| 1995 | struct btrfs_trans_handle *trans; |
| 1996 | struct btrfs_root *root = device->dev_root; |
| 1997 | struct btrfs_dev_extent *dev_extent = NULL; |
| 1998 | struct btrfs_path *path; |
| 1999 | u64 length; |
| 2000 | u64 chunk_tree; |
| 2001 | u64 chunk_objectid; |
| 2002 | u64 chunk_offset; |
| 2003 | int ret; |
| 2004 | int slot; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2005 | int failed = 0; |
| 2006 | bool retried = false; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2007 | struct extent_buffer *l; |
| 2008 | struct btrfs_key key; |
| 2009 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; |
| 2010 | u64 old_total = btrfs_super_total_bytes(super_copy); |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2011 | u64 old_size = device->total_bytes; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2012 | u64 diff = device->total_bytes - new_size; |
| 2013 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2014 | if (new_size >= device->total_bytes) |
| 2015 | return -EINVAL; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2016 | |
| 2017 | path = btrfs_alloc_path(); |
| 2018 | if (!path) |
| 2019 | return -ENOMEM; |
| 2020 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2021 | path->reada = 2; |
| 2022 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 2023 | lock_chunks(root); |
| 2024 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2025 | device->total_bytes = new_size; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2026 | if (device->writeable) |
| 2027 | device->fs_devices->total_rw_bytes -= diff; |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 2028 | unlock_chunks(root); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2029 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2030 | again: |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2031 | key.objectid = device->devid; |
| 2032 | key.offset = (u64)-1; |
| 2033 | key.type = BTRFS_DEV_EXTENT_KEY; |
| 2034 | |
| 2035 | while (1) { |
| 2036 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 2037 | if (ret < 0) |
| 2038 | goto done; |
| 2039 | |
| 2040 | ret = btrfs_previous_item(root, path, 0, key.type); |
| 2041 | if (ret < 0) |
| 2042 | goto done; |
| 2043 | if (ret) { |
| 2044 | ret = 0; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2045 | btrfs_release_path(root, path); |
Yan Zheng | bf1fb51 | 2009-07-22 09:59:00 -0400 | [diff] [blame] | 2046 | break; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2047 | } |
| 2048 | |
| 2049 | l = path->nodes[0]; |
| 2050 | slot = path->slots[0]; |
| 2051 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); |
| 2052 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2053 | if (key.objectid != device->devid) { |
| 2054 | btrfs_release_path(root, path); |
Yan Zheng | bf1fb51 | 2009-07-22 09:59:00 -0400 | [diff] [blame] | 2055 | break; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2056 | } |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2057 | |
| 2058 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
| 2059 | length = btrfs_dev_extent_length(l, dev_extent); |
| 2060 | |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2061 | if (key.offset + length <= new_size) { |
| 2062 | btrfs_release_path(root, path); |
Chris Ball | d6397ba | 2009-04-27 07:29:03 -0400 | [diff] [blame] | 2063 | break; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2064 | } |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2065 | |
| 2066 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); |
| 2067 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); |
| 2068 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); |
| 2069 | btrfs_release_path(root, path); |
| 2070 | |
| 2071 | ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid, |
| 2072 | chunk_offset); |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2073 | if (ret && ret != -ENOSPC) |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2074 | goto done; |
Josef Bacik | ba1bf48 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2075 | if (ret == -ENOSPC) |
| 2076 | failed++; |
| 2077 | key.offset -= 1; |
| 2078 | } |
| 2079 | |
| 2080 | if (failed && !retried) { |
| 2081 | failed = 0; |
| 2082 | retried = true; |
| 2083 | goto again; |
| 2084 | } else if (failed && retried) { |
| 2085 | ret = -ENOSPC; |
| 2086 | lock_chunks(root); |
| 2087 | |
| 2088 | device->total_bytes = old_size; |
| 2089 | if (device->writeable) |
| 2090 | device->fs_devices->total_rw_bytes += diff; |
| 2091 | unlock_chunks(root); |
| 2092 | goto done; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2093 | } |
| 2094 | |
Chris Ball | d6397ba | 2009-04-27 07:29:03 -0400 | [diff] [blame] | 2095 | /* Shrinking succeeded, else we would be at "done". */ |
| 2096 | trans = btrfs_start_transaction(root, 1); |
| 2097 | if (!trans) { |
| 2098 | ret = -ENOMEM; |
| 2099 | goto done; |
| 2100 | } |
| 2101 | lock_chunks(root); |
| 2102 | |
| 2103 | device->disk_total_bytes = new_size; |
| 2104 | /* Now btrfs_update_device() will change the on-disk size. */ |
| 2105 | ret = btrfs_update_device(trans, device); |
| 2106 | if (ret) { |
| 2107 | unlock_chunks(root); |
| 2108 | btrfs_end_transaction(trans, root); |
| 2109 | goto done; |
| 2110 | } |
| 2111 | WARN_ON(diff > old_total); |
| 2112 | btrfs_set_super_total_bytes(super_copy, old_total - diff); |
| 2113 | unlock_chunks(root); |
| 2114 | btrfs_end_transaction(trans, root); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2115 | done: |
| 2116 | btrfs_free_path(path); |
| 2117 | return ret; |
| 2118 | } |
| 2119 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 2120 | static int btrfs_add_system_chunk(struct btrfs_trans_handle *trans, |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2121 | struct btrfs_root *root, |
| 2122 | struct btrfs_key *key, |
| 2123 | struct btrfs_chunk *chunk, int item_size) |
| 2124 | { |
| 2125 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; |
| 2126 | struct btrfs_disk_key disk_key; |
| 2127 | u32 array_size; |
| 2128 | u8 *ptr; |
| 2129 | |
| 2130 | array_size = btrfs_super_sys_array_size(super_copy); |
| 2131 | if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) |
| 2132 | return -EFBIG; |
| 2133 | |
| 2134 | ptr = super_copy->sys_chunk_array + array_size; |
| 2135 | btrfs_cpu_key_to_disk(&disk_key, key); |
| 2136 | memcpy(ptr, &disk_key, sizeof(disk_key)); |
| 2137 | ptr += sizeof(disk_key); |
| 2138 | memcpy(ptr, chunk, item_size); |
| 2139 | item_size += sizeof(disk_key); |
| 2140 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); |
| 2141 | return 0; |
| 2142 | } |
| 2143 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2144 | static noinline u64 chunk_bytes_by_type(u64 type, u64 calc_size, |
Chris Mason | a1b32a5 | 2008-09-05 16:09:51 -0400 | [diff] [blame] | 2145 | int num_stripes, int sub_stripes) |
Chris Mason | 9b3f68b | 2008-04-18 10:29:51 -0400 | [diff] [blame] | 2146 | { |
| 2147 | if (type & (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP)) |
| 2148 | return calc_size; |
| 2149 | else if (type & BTRFS_BLOCK_GROUP_RAID10) |
| 2150 | return calc_size * (num_stripes / sub_stripes); |
| 2151 | else |
| 2152 | return calc_size * num_stripes; |
| 2153 | } |
| 2154 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2155 | static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
| 2156 | struct btrfs_root *extent_root, |
| 2157 | struct map_lookup **map_ret, |
| 2158 | u64 *num_bytes, u64 *stripe_size, |
| 2159 | u64 start, u64 type) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2160 | { |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2161 | struct btrfs_fs_info *info = extent_root->fs_info; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2162 | struct btrfs_device *device = NULL; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2163 | struct btrfs_fs_devices *fs_devices = info->fs_devices; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2164 | struct list_head *cur; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2165 | struct map_lookup *map = NULL; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2166 | struct extent_map_tree *em_tree; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2167 | struct extent_map *em; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2168 | struct list_head private_devs; |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2169 | int min_stripe_size = 1 * 1024 * 1024; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2170 | u64 calc_size = 1024 * 1024 * 1024; |
Chris Mason | 9b3f68b | 2008-04-18 10:29:51 -0400 | [diff] [blame] | 2171 | u64 max_chunk_size = calc_size; |
| 2172 | u64 min_free; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2173 | u64 avail; |
| 2174 | u64 max_avail = 0; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2175 | u64 dev_offset; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2176 | int num_stripes = 1; |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2177 | int min_stripes = 1; |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2178 | int sub_stripes = 0; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2179 | int looped = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2180 | int ret; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2181 | int index; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2182 | int stripe_len = 64 * 1024; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2183 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 2184 | if ((type & BTRFS_BLOCK_GROUP_RAID1) && |
| 2185 | (type & BTRFS_BLOCK_GROUP_DUP)) { |
| 2186 | WARN_ON(1); |
| 2187 | type &= ~BTRFS_BLOCK_GROUP_DUP; |
| 2188 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2189 | if (list_empty(&fs_devices->alloc_list)) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2190 | return -ENOSPC; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2191 | |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2192 | if (type & (BTRFS_BLOCK_GROUP_RAID0)) { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2193 | num_stripes = fs_devices->rw_devices; |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2194 | min_stripes = 2; |
| 2195 | } |
| 2196 | if (type & (BTRFS_BLOCK_GROUP_DUP)) { |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2197 | num_stripes = 2; |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2198 | min_stripes = 2; |
| 2199 | } |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2200 | if (type & (BTRFS_BLOCK_GROUP_RAID1)) { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2201 | num_stripes = min_t(u64, 2, fs_devices->rw_devices); |
Chris Mason | 9b3f68b | 2008-04-18 10:29:51 -0400 | [diff] [blame] | 2202 | if (num_stripes < 2) |
| 2203 | return -ENOSPC; |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2204 | min_stripes = 2; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2205 | } |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2206 | if (type & (BTRFS_BLOCK_GROUP_RAID10)) { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2207 | num_stripes = fs_devices->rw_devices; |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2208 | if (num_stripes < 4) |
| 2209 | return -ENOSPC; |
| 2210 | num_stripes &= ~(u32)1; |
| 2211 | sub_stripes = 2; |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2212 | min_stripes = 4; |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2213 | } |
Chris Mason | 9b3f68b | 2008-04-18 10:29:51 -0400 | [diff] [blame] | 2214 | |
| 2215 | if (type & BTRFS_BLOCK_GROUP_DATA) { |
| 2216 | max_chunk_size = 10 * calc_size; |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2217 | min_stripe_size = 64 * 1024 * 1024; |
Chris Mason | 9b3f68b | 2008-04-18 10:29:51 -0400 | [diff] [blame] | 2218 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
Josef Bacik | 83d3c96 | 2009-12-07 21:45:59 +0000 | [diff] [blame] | 2219 | max_chunk_size = 256 * 1024 * 1024; |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2220 | min_stripe_size = 32 * 1024 * 1024; |
| 2221 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { |
| 2222 | calc_size = 8 * 1024 * 1024; |
| 2223 | max_chunk_size = calc_size * 2; |
| 2224 | min_stripe_size = 1 * 1024 * 1024; |
Chris Mason | 9b3f68b | 2008-04-18 10:29:51 -0400 | [diff] [blame] | 2225 | } |
| 2226 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2227 | /* we don't want a chunk larger than 10% of writeable space */ |
| 2228 | max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), |
| 2229 | max_chunk_size); |
Chris Mason | 9b3f68b | 2008-04-18 10:29:51 -0400 | [diff] [blame] | 2230 | |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2231 | again: |
Chris Mason | 9779b72 | 2009-07-24 16:41:41 -0400 | [diff] [blame] | 2232 | max_avail = 0; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2233 | if (!map || map->num_stripes != num_stripes) { |
| 2234 | kfree(map); |
| 2235 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); |
| 2236 | if (!map) |
| 2237 | return -ENOMEM; |
| 2238 | map->num_stripes = num_stripes; |
| 2239 | } |
| 2240 | |
Chris Mason | 9b3f68b | 2008-04-18 10:29:51 -0400 | [diff] [blame] | 2241 | if (calc_size * num_stripes > max_chunk_size) { |
| 2242 | calc_size = max_chunk_size; |
| 2243 | do_div(calc_size, num_stripes); |
| 2244 | do_div(calc_size, stripe_len); |
| 2245 | calc_size *= stripe_len; |
| 2246 | } |
| 2247 | /* we don't want tiny stripes */ |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2248 | calc_size = max_t(u64, min_stripe_size, calc_size); |
Chris Mason | 9b3f68b | 2008-04-18 10:29:51 -0400 | [diff] [blame] | 2249 | |
Chris Mason | 9b3f68b | 2008-04-18 10:29:51 -0400 | [diff] [blame] | 2250 | do_div(calc_size, stripe_len); |
| 2251 | calc_size *= stripe_len; |
| 2252 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2253 | cur = fs_devices->alloc_list.next; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2254 | index = 0; |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2255 | |
| 2256 | if (type & BTRFS_BLOCK_GROUP_DUP) |
| 2257 | min_free = calc_size * 2; |
Chris Mason | 9b3f68b | 2008-04-18 10:29:51 -0400 | [diff] [blame] | 2258 | else |
| 2259 | min_free = calc_size; |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2260 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2261 | /* |
| 2262 | * we add 1MB because we never use the first 1MB of the device, unless |
| 2263 | * we've looped, then we are likely allocating the maximum amount of |
| 2264 | * space left already |
| 2265 | */ |
| 2266 | if (!looped) |
| 2267 | min_free += 1024 * 1024; |
Chris Mason | ad5bd91 | 2008-04-21 08:28:10 -0400 | [diff] [blame] | 2268 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2269 | INIT_LIST_HEAD(&private_devs); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2270 | while (index < num_stripes) { |
Chris Mason | b307571 | 2008-04-22 09:22:07 -0400 | [diff] [blame] | 2271 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2272 | BUG_ON(!device->writeable); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 2273 | if (device->total_bytes > device->bytes_used) |
| 2274 | avail = device->total_bytes - device->bytes_used; |
| 2275 | else |
| 2276 | avail = 0; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2277 | cur = cur->next; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2278 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 2279 | if (device->in_fs_metadata && avail >= min_free) { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2280 | ret = find_free_dev_extent(trans, device, |
Chris Mason | 9779b72 | 2009-07-24 16:41:41 -0400 | [diff] [blame] | 2281 | min_free, &dev_offset, |
| 2282 | &max_avail); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2283 | if (ret == 0) { |
| 2284 | list_move_tail(&device->dev_alloc_list, |
| 2285 | &private_devs); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2286 | map->stripes[index].dev = device; |
| 2287 | map->stripes[index].physical = dev_offset; |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2288 | index++; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2289 | if (type & BTRFS_BLOCK_GROUP_DUP) { |
| 2290 | map->stripes[index].dev = device; |
| 2291 | map->stripes[index].physical = |
| 2292 | dev_offset + calc_size; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2293 | index++; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2294 | } |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2295 | } |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 2296 | } else if (device->in_fs_metadata && avail > max_avail) |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2297 | max_avail = avail; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2298 | if (cur == &fs_devices->alloc_list) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2299 | break; |
| 2300 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2301 | list_splice(&private_devs, &fs_devices->alloc_list); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2302 | if (index < num_stripes) { |
Chris Mason | a40a90a | 2008-04-18 11:55:51 -0400 | [diff] [blame] | 2303 | if (index >= min_stripes) { |
| 2304 | num_stripes = index; |
| 2305 | if (type & (BTRFS_BLOCK_GROUP_RAID10)) { |
| 2306 | num_stripes /= sub_stripes; |
| 2307 | num_stripes *= sub_stripes; |
| 2308 | } |
| 2309 | looped = 1; |
| 2310 | goto again; |
| 2311 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2312 | if (!looped && max_avail > 0) { |
| 2313 | looped = 1; |
| 2314 | calc_size = max_avail; |
| 2315 | goto again; |
| 2316 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2317 | kfree(map); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2318 | return -ENOSPC; |
| 2319 | } |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2320 | map->sector_size = extent_root->sectorsize; |
| 2321 | map->stripe_len = stripe_len; |
| 2322 | map->io_align = stripe_len; |
| 2323 | map->io_width = stripe_len; |
| 2324 | map->type = type; |
| 2325 | map->num_stripes = num_stripes; |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2326 | map->sub_stripes = sub_stripes; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2327 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2328 | *map_ret = map; |
| 2329 | *stripe_size = calc_size; |
| 2330 | *num_bytes = chunk_bytes_by_type(type, calc_size, |
| 2331 | num_stripes, sub_stripes); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2332 | |
| 2333 | em = alloc_extent_map(GFP_NOFS); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2334 | if (!em) { |
| 2335 | kfree(map); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2336 | return -ENOMEM; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2337 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2338 | em->bdev = (struct block_device *)map; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2339 | em->start = start; |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 2340 | em->len = *num_bytes; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2341 | em->block_start = 0; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 2342 | em->block_len = em->len; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2343 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2344 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2345 | write_lock(&em_tree->lock); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2346 | ret = add_extent_mapping(em_tree, em); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2347 | write_unlock(&em_tree->lock); |
Chris Mason | b248a41 | 2008-04-14 09:48:18 -0400 | [diff] [blame] | 2348 | BUG_ON(ret); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2349 | free_extent_map(em); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2350 | |
| 2351 | ret = btrfs_make_block_group(trans, extent_root, 0, type, |
| 2352 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, |
| 2353 | start, *num_bytes); |
| 2354 | BUG_ON(ret); |
| 2355 | |
| 2356 | index = 0; |
| 2357 | while (index < map->num_stripes) { |
| 2358 | device = map->stripes[index].dev; |
| 2359 | dev_offset = map->stripes[index].physical; |
| 2360 | |
| 2361 | ret = btrfs_alloc_dev_extent(trans, device, |
| 2362 | info->chunk_root->root_key.objectid, |
| 2363 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, |
| 2364 | start, dev_offset, calc_size); |
| 2365 | BUG_ON(ret); |
| 2366 | index++; |
| 2367 | } |
| 2368 | |
| 2369 | return 0; |
| 2370 | } |
| 2371 | |
| 2372 | static int __finish_chunk_alloc(struct btrfs_trans_handle *trans, |
| 2373 | struct btrfs_root *extent_root, |
| 2374 | struct map_lookup *map, u64 chunk_offset, |
| 2375 | u64 chunk_size, u64 stripe_size) |
| 2376 | { |
| 2377 | u64 dev_offset; |
| 2378 | struct btrfs_key key; |
| 2379 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; |
| 2380 | struct btrfs_device *device; |
| 2381 | struct btrfs_chunk *chunk; |
| 2382 | struct btrfs_stripe *stripe; |
| 2383 | size_t item_size = btrfs_chunk_item_size(map->num_stripes); |
| 2384 | int index = 0; |
| 2385 | int ret; |
| 2386 | |
| 2387 | chunk = kzalloc(item_size, GFP_NOFS); |
| 2388 | if (!chunk) |
| 2389 | return -ENOMEM; |
| 2390 | |
| 2391 | index = 0; |
| 2392 | while (index < map->num_stripes) { |
| 2393 | device = map->stripes[index].dev; |
| 2394 | device->bytes_used += stripe_size; |
| 2395 | ret = btrfs_update_device(trans, device); |
| 2396 | BUG_ON(ret); |
| 2397 | index++; |
| 2398 | } |
| 2399 | |
| 2400 | index = 0; |
| 2401 | stripe = &chunk->stripe; |
| 2402 | while (index < map->num_stripes) { |
| 2403 | device = map->stripes[index].dev; |
| 2404 | dev_offset = map->stripes[index].physical; |
| 2405 | |
| 2406 | btrfs_set_stack_stripe_devid(stripe, device->devid); |
| 2407 | btrfs_set_stack_stripe_offset(stripe, dev_offset); |
| 2408 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); |
| 2409 | stripe++; |
| 2410 | index++; |
| 2411 | } |
| 2412 | |
| 2413 | btrfs_set_stack_chunk_length(chunk, chunk_size); |
| 2414 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
| 2415 | btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len); |
| 2416 | btrfs_set_stack_chunk_type(chunk, map->type); |
| 2417 | btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes); |
| 2418 | btrfs_set_stack_chunk_io_align(chunk, map->stripe_len); |
| 2419 | btrfs_set_stack_chunk_io_width(chunk, map->stripe_len); |
| 2420 | btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize); |
| 2421 | btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes); |
| 2422 | |
| 2423 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
| 2424 | key.type = BTRFS_CHUNK_ITEM_KEY; |
| 2425 | key.offset = chunk_offset; |
| 2426 | |
| 2427 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size); |
| 2428 | BUG_ON(ret); |
| 2429 | |
| 2430 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
| 2431 | ret = btrfs_add_system_chunk(trans, chunk_root, &key, chunk, |
| 2432 | item_size); |
| 2433 | BUG_ON(ret); |
| 2434 | } |
| 2435 | kfree(chunk); |
| 2436 | return 0; |
| 2437 | } |
| 2438 | |
| 2439 | /* |
| 2440 | * Chunk allocation falls into two parts. The first part does works |
| 2441 | * that make the new allocated chunk useable, but not do any operation |
| 2442 | * that modifies the chunk tree. The second part does the works that |
| 2443 | * require modifying the chunk tree. This division is important for the |
| 2444 | * bootstrap process of adding storage to a seed btrfs. |
| 2445 | */ |
| 2446 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
| 2447 | struct btrfs_root *extent_root, u64 type) |
| 2448 | { |
| 2449 | u64 chunk_offset; |
| 2450 | u64 chunk_size; |
| 2451 | u64 stripe_size; |
| 2452 | struct map_lookup *map; |
| 2453 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; |
| 2454 | int ret; |
| 2455 | |
| 2456 | ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID, |
| 2457 | &chunk_offset); |
| 2458 | if (ret) |
| 2459 | return ret; |
| 2460 | |
| 2461 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, |
| 2462 | &stripe_size, chunk_offset, type); |
| 2463 | if (ret) |
| 2464 | return ret; |
| 2465 | |
| 2466 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, |
| 2467 | chunk_size, stripe_size); |
| 2468 | BUG_ON(ret); |
| 2469 | return 0; |
| 2470 | } |
| 2471 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2472 | static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2473 | struct btrfs_root *root, |
| 2474 | struct btrfs_device *device) |
| 2475 | { |
| 2476 | u64 chunk_offset; |
| 2477 | u64 sys_chunk_offset; |
| 2478 | u64 chunk_size; |
| 2479 | u64 sys_chunk_size; |
| 2480 | u64 stripe_size; |
| 2481 | u64 sys_stripe_size; |
| 2482 | u64 alloc_profile; |
| 2483 | struct map_lookup *map; |
| 2484 | struct map_lookup *sys_map; |
| 2485 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2486 | struct btrfs_root *extent_root = fs_info->extent_root; |
| 2487 | int ret; |
| 2488 | |
| 2489 | ret = find_next_chunk(fs_info->chunk_root, |
| 2490 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, &chunk_offset); |
| 2491 | BUG_ON(ret); |
| 2492 | |
| 2493 | alloc_profile = BTRFS_BLOCK_GROUP_METADATA | |
| 2494 | (fs_info->metadata_alloc_profile & |
| 2495 | fs_info->avail_metadata_alloc_bits); |
| 2496 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); |
| 2497 | |
| 2498 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, |
| 2499 | &stripe_size, chunk_offset, alloc_profile); |
| 2500 | BUG_ON(ret); |
| 2501 | |
| 2502 | sys_chunk_offset = chunk_offset + chunk_size; |
| 2503 | |
| 2504 | alloc_profile = BTRFS_BLOCK_GROUP_SYSTEM | |
| 2505 | (fs_info->system_alloc_profile & |
| 2506 | fs_info->avail_system_alloc_bits); |
| 2507 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); |
| 2508 | |
| 2509 | ret = __btrfs_alloc_chunk(trans, extent_root, &sys_map, |
| 2510 | &sys_chunk_size, &sys_stripe_size, |
| 2511 | sys_chunk_offset, alloc_profile); |
| 2512 | BUG_ON(ret); |
| 2513 | |
| 2514 | ret = btrfs_add_device(trans, fs_info->chunk_root, device); |
| 2515 | BUG_ON(ret); |
| 2516 | |
| 2517 | /* |
| 2518 | * Modifying chunk tree needs allocating new blocks from both |
| 2519 | * system block group and metadata block group. So we only can |
| 2520 | * do operations require modifying the chunk tree after both |
| 2521 | * block groups were created. |
| 2522 | */ |
| 2523 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, |
| 2524 | chunk_size, stripe_size); |
| 2525 | BUG_ON(ret); |
| 2526 | |
| 2527 | ret = __finish_chunk_alloc(trans, extent_root, sys_map, |
| 2528 | sys_chunk_offset, sys_chunk_size, |
| 2529 | sys_stripe_size); |
| 2530 | BUG_ON(ret); |
| 2531 | return 0; |
| 2532 | } |
| 2533 | |
| 2534 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset) |
| 2535 | { |
| 2536 | struct extent_map *em; |
| 2537 | struct map_lookup *map; |
| 2538 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; |
| 2539 | int readonly = 0; |
| 2540 | int i; |
| 2541 | |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2542 | read_lock(&map_tree->map_tree.lock); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2543 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2544 | read_unlock(&map_tree->map_tree.lock); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2545 | if (!em) |
| 2546 | return 1; |
| 2547 | |
Josef Bacik | f48b907 | 2010-01-27 02:07:59 +0000 | [diff] [blame] | 2548 | if (btrfs_test_opt(root, DEGRADED)) { |
| 2549 | free_extent_map(em); |
| 2550 | return 0; |
| 2551 | } |
| 2552 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 2553 | map = (struct map_lookup *)em->bdev; |
| 2554 | for (i = 0; i < map->num_stripes; i++) { |
| 2555 | if (!map->stripes[i].dev->writeable) { |
| 2556 | readonly = 1; |
| 2557 | break; |
| 2558 | } |
| 2559 | } |
| 2560 | free_extent_map(em); |
| 2561 | return readonly; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2562 | } |
| 2563 | |
| 2564 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) |
| 2565 | { |
| 2566 | extent_map_tree_init(&tree->map_tree, GFP_NOFS); |
| 2567 | } |
| 2568 | |
| 2569 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) |
| 2570 | { |
| 2571 | struct extent_map *em; |
| 2572 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2573 | while (1) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2574 | write_lock(&tree->map_tree.lock); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2575 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); |
| 2576 | if (em) |
| 2577 | remove_extent_mapping(&tree->map_tree, em); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2578 | write_unlock(&tree->map_tree.lock); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2579 | if (!em) |
| 2580 | break; |
| 2581 | kfree(em->bdev); |
| 2582 | /* once for us */ |
| 2583 | free_extent_map(em); |
| 2584 | /* once for the tree */ |
| 2585 | free_extent_map(em); |
| 2586 | } |
| 2587 | } |
| 2588 | |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2589 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len) |
| 2590 | { |
| 2591 | struct extent_map *em; |
| 2592 | struct map_lookup *map; |
| 2593 | struct extent_map_tree *em_tree = &map_tree->map_tree; |
| 2594 | int ret; |
| 2595 | |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2596 | read_lock(&em_tree->lock); |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2597 | em = lookup_extent_mapping(em_tree, logical, len); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2598 | read_unlock(&em_tree->lock); |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2599 | BUG_ON(!em); |
| 2600 | |
| 2601 | BUG_ON(em->start > logical || em->start + em->len < logical); |
| 2602 | map = (struct map_lookup *)em->bdev; |
| 2603 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) |
| 2604 | ret = map->num_stripes; |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2605 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
| 2606 | ret = map->sub_stripes; |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2607 | else |
| 2608 | ret = 1; |
| 2609 | free_extent_map(em); |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2610 | return ret; |
| 2611 | } |
| 2612 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 2613 | static int find_live_mirror(struct map_lookup *map, int first, int num, |
| 2614 | int optimal) |
| 2615 | { |
| 2616 | int i; |
| 2617 | if (map->stripes[optimal].dev->bdev) |
| 2618 | return optimal; |
| 2619 | for (i = first; i < first + num; i++) { |
| 2620 | if (map->stripes[i].dev->bdev) |
| 2621 | return i; |
| 2622 | } |
| 2623 | /* we couldn't find one that doesn't fail. Just return something |
| 2624 | * and the io error handling code will clean up eventually |
| 2625 | */ |
| 2626 | return optimal; |
| 2627 | } |
| 2628 | |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2629 | static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
| 2630 | u64 logical, u64 *length, |
| 2631 | struct btrfs_multi_bio **multi_ret, |
| 2632 | int mirror_num, struct page *unplug_page) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2633 | { |
| 2634 | struct extent_map *em; |
| 2635 | struct map_lookup *map; |
| 2636 | struct extent_map_tree *em_tree = &map_tree->map_tree; |
| 2637 | u64 offset; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2638 | u64 stripe_offset; |
| 2639 | u64 stripe_nr; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2640 | int stripes_allocated = 8; |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2641 | int stripes_required = 1; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2642 | int stripe_index; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2643 | int i; |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2644 | int num_stripes; |
Chris Mason | a236aed | 2008-04-29 09:38:00 -0400 | [diff] [blame] | 2645 | int max_errors = 0; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2646 | struct btrfs_multi_bio *multi = NULL; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2647 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2648 | if (multi_ret && !(rw & (1 << BIO_RW))) |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2649 | stripes_allocated = 1; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2650 | again: |
| 2651 | if (multi_ret) { |
| 2652 | multi = kzalloc(btrfs_multi_bio_size(stripes_allocated), |
| 2653 | GFP_NOFS); |
| 2654 | if (!multi) |
| 2655 | return -ENOMEM; |
Chris Mason | a236aed | 2008-04-29 09:38:00 -0400 | [diff] [blame] | 2656 | |
| 2657 | atomic_set(&multi->error, 0); |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2658 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2659 | |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2660 | read_lock(&em_tree->lock); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2661 | em = lookup_extent_mapping(em_tree, logical, *length); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2662 | read_unlock(&em_tree->lock); |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2663 | |
Jiri Slaby | 2423fdf | 2010-01-06 16:57:22 +0000 | [diff] [blame] | 2664 | if (!em && unplug_page) { |
| 2665 | kfree(multi); |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2666 | return 0; |
Jiri Slaby | 2423fdf | 2010-01-06 16:57:22 +0000 | [diff] [blame] | 2667 | } |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2668 | |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 2669 | if (!em) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2670 | printk(KERN_CRIT "unable to find logical %llu len %llu\n", |
| 2671 | (unsigned long long)logical, |
| 2672 | (unsigned long long)*length); |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2673 | BUG(); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 2674 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2675 | |
| 2676 | BUG_ON(em->start > logical || em->start + em->len < logical); |
| 2677 | map = (struct map_lookup *)em->bdev; |
| 2678 | offset = logical - em->start; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2679 | |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2680 | if (mirror_num > map->num_stripes) |
| 2681 | mirror_num = 0; |
| 2682 | |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2683 | /* if our multi bio struct is too small, back off and try again */ |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2684 | if (rw & (1 << BIO_RW)) { |
| 2685 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | |
| 2686 | BTRFS_BLOCK_GROUP_DUP)) { |
| 2687 | stripes_required = map->num_stripes; |
Chris Mason | a236aed | 2008-04-29 09:38:00 -0400 | [diff] [blame] | 2688 | max_errors = 1; |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2689 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
| 2690 | stripes_required = map->sub_stripes; |
Chris Mason | a236aed | 2008-04-29 09:38:00 -0400 | [diff] [blame] | 2691 | max_errors = 1; |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2692 | } |
| 2693 | } |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 2694 | if (multi_ret && (rw & (1 << BIO_RW)) && |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2695 | stripes_allocated < stripes_required) { |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2696 | stripes_allocated = map->num_stripes; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2697 | free_extent_map(em); |
| 2698 | kfree(multi); |
| 2699 | goto again; |
| 2700 | } |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2701 | stripe_nr = offset; |
| 2702 | /* |
| 2703 | * stripe_nr counts the total number of stripes we have to stride |
| 2704 | * to get to this block |
| 2705 | */ |
| 2706 | do_div(stripe_nr, map->stripe_len); |
| 2707 | |
| 2708 | stripe_offset = stripe_nr * map->stripe_len; |
| 2709 | BUG_ON(offset < stripe_offset); |
| 2710 | |
| 2711 | /* stripe_offset is the offset of this block in its stripe*/ |
| 2712 | stripe_offset = offset - stripe_offset; |
| 2713 | |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2714 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 | |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2715 | BTRFS_BLOCK_GROUP_RAID10 | |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2716 | BTRFS_BLOCK_GROUP_DUP)) { |
| 2717 | /* we limit the length of each bio to what fits in a stripe */ |
| 2718 | *length = min_t(u64, em->len - offset, |
| 2719 | map->stripe_len - stripe_offset); |
| 2720 | } else { |
| 2721 | *length = em->len - offset; |
| 2722 | } |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2723 | |
| 2724 | if (!multi_ret && !unplug_page) |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2725 | goto out; |
| 2726 | |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2727 | num_stripes = 1; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2728 | stripe_index = 0; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2729 | if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2730 | if (unplug_page || (rw & (1 << BIO_RW))) |
| 2731 | num_stripes = map->num_stripes; |
Chris Mason | 2fff734 | 2008-04-29 14:12:09 -0400 | [diff] [blame] | 2732 | else if (mirror_num) |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2733 | stripe_index = mirror_num - 1; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 2734 | else { |
| 2735 | stripe_index = find_live_mirror(map, 0, |
| 2736 | map->num_stripes, |
| 2737 | current->pid % map->num_stripes); |
| 2738 | } |
Chris Mason | 2fff734 | 2008-04-29 14:12:09 -0400 | [diff] [blame] | 2739 | |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2740 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2741 | if (rw & (1 << BIO_RW)) |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2742 | num_stripes = map->num_stripes; |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2743 | else if (mirror_num) |
| 2744 | stripe_index = mirror_num - 1; |
Chris Mason | 2fff734 | 2008-04-29 14:12:09 -0400 | [diff] [blame] | 2745 | |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2746 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
| 2747 | int factor = map->num_stripes / map->sub_stripes; |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2748 | |
| 2749 | stripe_index = do_div(stripe_nr, factor); |
| 2750 | stripe_index *= map->sub_stripes; |
| 2751 | |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2752 | if (unplug_page || (rw & (1 << BIO_RW))) |
| 2753 | num_stripes = map->sub_stripes; |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 2754 | else if (mirror_num) |
| 2755 | stripe_index += mirror_num - 1; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 2756 | else { |
| 2757 | stripe_index = find_live_mirror(map, stripe_index, |
| 2758 | map->sub_stripes, stripe_index + |
| 2759 | current->pid % map->sub_stripes); |
| 2760 | } |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2761 | } else { |
| 2762 | /* |
| 2763 | * after this do_div call, stripe_nr is the number of stripes |
| 2764 | * on this device we have to walk to find the data, and |
| 2765 | * stripe_index is the number of our device in the stripe array |
| 2766 | */ |
| 2767 | stripe_index = do_div(stripe_nr, map->num_stripes); |
| 2768 | } |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2769 | BUG_ON(stripe_index >= map->num_stripes); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2770 | |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2771 | for (i = 0; i < num_stripes; i++) { |
| 2772 | if (unplug_page) { |
| 2773 | struct btrfs_device *device; |
| 2774 | struct backing_dev_info *bdi; |
| 2775 | |
| 2776 | device = map->stripes[stripe_index].dev; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 2777 | if (device->bdev) { |
| 2778 | bdi = blk_get_backing_dev_info(device->bdev); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2779 | if (bdi->unplug_io_fn) |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 2780 | bdi->unplug_io_fn(bdi, unplug_page); |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2781 | } |
| 2782 | } else { |
| 2783 | multi->stripes[i].physical = |
| 2784 | map->stripes[stripe_index].physical + |
| 2785 | stripe_offset + stripe_nr * map->stripe_len; |
| 2786 | multi->stripes[i].dev = map->stripes[stripe_index].dev; |
| 2787 | } |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2788 | stripe_index++; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 2789 | } |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2790 | if (multi_ret) { |
| 2791 | *multi_ret = multi; |
| 2792 | multi->num_stripes = num_stripes; |
Chris Mason | a236aed | 2008-04-29 09:38:00 -0400 | [diff] [blame] | 2793 | multi->max_errors = max_errors; |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2794 | } |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2795 | out: |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2796 | free_extent_map(em); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2797 | return 0; |
| 2798 | } |
| 2799 | |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2800 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
| 2801 | u64 logical, u64 *length, |
| 2802 | struct btrfs_multi_bio **multi_ret, int mirror_num) |
| 2803 | { |
| 2804 | return __btrfs_map_block(map_tree, rw, logical, length, multi_ret, |
| 2805 | mirror_num, NULL); |
| 2806 | } |
| 2807 | |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 2808 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
| 2809 | u64 chunk_start, u64 physical, u64 devid, |
| 2810 | u64 **logical, int *naddrs, int *stripe_len) |
| 2811 | { |
| 2812 | struct extent_map_tree *em_tree = &map_tree->map_tree; |
| 2813 | struct extent_map *em; |
| 2814 | struct map_lookup *map; |
| 2815 | u64 *buf; |
| 2816 | u64 bytenr; |
| 2817 | u64 length; |
| 2818 | u64 stripe_nr; |
| 2819 | int i, j, nr = 0; |
| 2820 | |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2821 | read_lock(&em_tree->lock); |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 2822 | em = lookup_extent_mapping(em_tree, chunk_start, 1); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 2823 | read_unlock(&em_tree->lock); |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 2824 | |
| 2825 | BUG_ON(!em || em->start != chunk_start); |
| 2826 | map = (struct map_lookup *)em->bdev; |
| 2827 | |
| 2828 | length = em->len; |
| 2829 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
| 2830 | do_div(length, map->num_stripes / map->sub_stripes); |
| 2831 | else if (map->type & BTRFS_BLOCK_GROUP_RAID0) |
| 2832 | do_div(length, map->num_stripes); |
| 2833 | |
| 2834 | buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS); |
| 2835 | BUG_ON(!buf); |
| 2836 | |
| 2837 | for (i = 0; i < map->num_stripes; i++) { |
| 2838 | if (devid && map->stripes[i].dev->devid != devid) |
| 2839 | continue; |
| 2840 | if (map->stripes[i].physical > physical || |
| 2841 | map->stripes[i].physical + length <= physical) |
| 2842 | continue; |
| 2843 | |
| 2844 | stripe_nr = physical - map->stripes[i].physical; |
| 2845 | do_div(stripe_nr, map->stripe_len); |
| 2846 | |
| 2847 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
| 2848 | stripe_nr = stripe_nr * map->num_stripes + i; |
| 2849 | do_div(stripe_nr, map->sub_stripes); |
| 2850 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
| 2851 | stripe_nr = stripe_nr * map->num_stripes + i; |
| 2852 | } |
| 2853 | bytenr = chunk_start + stripe_nr * map->stripe_len; |
Chris Mason | 934d375 | 2008-12-08 16:43:10 -0500 | [diff] [blame] | 2854 | WARN_ON(nr >= map->num_stripes); |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 2855 | for (j = 0; j < nr; j++) { |
| 2856 | if (buf[j] == bytenr) |
| 2857 | break; |
| 2858 | } |
Chris Mason | 934d375 | 2008-12-08 16:43:10 -0500 | [diff] [blame] | 2859 | if (j == nr) { |
| 2860 | WARN_ON(nr >= map->num_stripes); |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 2861 | buf[nr++] = bytenr; |
Chris Mason | 934d375 | 2008-12-08 16:43:10 -0500 | [diff] [blame] | 2862 | } |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 2863 | } |
| 2864 | |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 2865 | *logical = buf; |
| 2866 | *naddrs = nr; |
| 2867 | *stripe_len = map->stripe_len; |
| 2868 | |
| 2869 | free_extent_map(em); |
| 2870 | return 0; |
| 2871 | } |
| 2872 | |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2873 | int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, |
| 2874 | u64 logical, struct page *page) |
| 2875 | { |
| 2876 | u64 length = PAGE_CACHE_SIZE; |
| 2877 | return __btrfs_map_block(map_tree, READ, logical, &length, |
| 2878 | NULL, 0, page); |
| 2879 | } |
| 2880 | |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2881 | static void end_bio_multi_stripe(struct bio *bio, int err) |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2882 | { |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2883 | struct btrfs_multi_bio *multi = bio->bi_private; |
Chris Mason | 7d2b4da | 2008-08-05 10:13:57 -0400 | [diff] [blame] | 2884 | int is_orig_bio = 0; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2885 | |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2886 | if (err) |
Chris Mason | a236aed | 2008-04-29 09:38:00 -0400 | [diff] [blame] | 2887 | atomic_inc(&multi->error); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2888 | |
Chris Mason | 7d2b4da | 2008-08-05 10:13:57 -0400 | [diff] [blame] | 2889 | if (bio == multi->orig_bio) |
| 2890 | is_orig_bio = 1; |
| 2891 | |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2892 | if (atomic_dec_and_test(&multi->stripes_pending)) { |
Chris Mason | 7d2b4da | 2008-08-05 10:13:57 -0400 | [diff] [blame] | 2893 | if (!is_orig_bio) { |
| 2894 | bio_put(bio); |
| 2895 | bio = multi->orig_bio; |
| 2896 | } |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2897 | bio->bi_private = multi->private; |
| 2898 | bio->bi_end_io = multi->end_io; |
Chris Mason | a236aed | 2008-04-29 09:38:00 -0400 | [diff] [blame] | 2899 | /* only send an error to the higher layers if it is |
| 2900 | * beyond the tolerance of the multi-bio |
| 2901 | */ |
Chris Mason | 1259ab7 | 2008-05-12 13:39:03 -0400 | [diff] [blame] | 2902 | if (atomic_read(&multi->error) > multi->max_errors) { |
Chris Mason | a236aed | 2008-04-29 09:38:00 -0400 | [diff] [blame] | 2903 | err = -EIO; |
Chris Mason | 1259ab7 | 2008-05-12 13:39:03 -0400 | [diff] [blame] | 2904 | } else if (err) { |
| 2905 | /* |
| 2906 | * this bio is actually up to date, we didn't |
| 2907 | * go over the max number of errors |
| 2908 | */ |
| 2909 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
Chris Mason | a236aed | 2008-04-29 09:38:00 -0400 | [diff] [blame] | 2910 | err = 0; |
Chris Mason | 1259ab7 | 2008-05-12 13:39:03 -0400 | [diff] [blame] | 2911 | } |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2912 | kfree(multi); |
| 2913 | |
| 2914 | bio_endio(bio, err); |
Chris Mason | 7d2b4da | 2008-08-05 10:13:57 -0400 | [diff] [blame] | 2915 | } else if (!is_orig_bio) { |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2916 | bio_put(bio); |
| 2917 | } |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2918 | } |
| 2919 | |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2920 | struct async_sched { |
| 2921 | struct bio *bio; |
| 2922 | int rw; |
| 2923 | struct btrfs_fs_info *info; |
| 2924 | struct btrfs_work work; |
| 2925 | }; |
| 2926 | |
| 2927 | /* |
| 2928 | * see run_scheduled_bios for a description of why bios are collected for |
| 2929 | * async submit. |
| 2930 | * |
| 2931 | * This will add one bio to the pending list for a device and make sure |
| 2932 | * the work struct is scheduled. |
| 2933 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2934 | static noinline int schedule_bio(struct btrfs_root *root, |
Chris Mason | a1b32a5 | 2008-09-05 16:09:51 -0400 | [diff] [blame] | 2935 | struct btrfs_device *device, |
| 2936 | int rw, struct bio *bio) |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2937 | { |
| 2938 | int should_queue = 1; |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 2939 | struct btrfs_pending_bios *pending_bios; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2940 | |
| 2941 | /* don't bother with additional async steps for reads, right now */ |
| 2942 | if (!(rw & (1 << BIO_RW))) { |
Chris Mason | 492bb6d | 2008-07-31 16:29:02 -0400 | [diff] [blame] | 2943 | bio_get(bio); |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2944 | submit_bio(rw, bio); |
Chris Mason | 492bb6d | 2008-07-31 16:29:02 -0400 | [diff] [blame] | 2945 | bio_put(bio); |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2946 | return 0; |
| 2947 | } |
| 2948 | |
| 2949 | /* |
Chris Mason | 0986fe9 | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 2950 | * nr_async_bios allows us to reliably return congestion to the |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2951 | * higher layers. Otherwise, the async bio makes it appear we have |
| 2952 | * made progress against dirty pages when we've really just put it |
| 2953 | * on a queue for later |
| 2954 | */ |
Chris Mason | 0986fe9 | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 2955 | atomic_inc(&root->fs_info->nr_async_bios); |
Chris Mason | 492bb6d | 2008-07-31 16:29:02 -0400 | [diff] [blame] | 2956 | WARN_ON(bio->bi_next); |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2957 | bio->bi_next = NULL; |
| 2958 | bio->bi_rw |= rw; |
| 2959 | |
| 2960 | spin_lock(&device->io_lock); |
Jens Axboe | 1f98a13 | 2009-09-11 14:32:04 +0200 | [diff] [blame] | 2961 | if (bio_rw_flagged(bio, BIO_RW_SYNCIO)) |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 2962 | pending_bios = &device->pending_sync_bios; |
| 2963 | else |
| 2964 | pending_bios = &device->pending_bios; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2965 | |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 2966 | if (pending_bios->tail) |
| 2967 | pending_bios->tail->bi_next = bio; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2968 | |
Chris Mason | ffbd517 | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 2969 | pending_bios->tail = bio; |
| 2970 | if (!pending_bios->head) |
| 2971 | pending_bios->head = bio; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2972 | if (device->running_pending) |
| 2973 | should_queue = 0; |
| 2974 | |
| 2975 | spin_unlock(&device->io_lock); |
| 2976 | |
| 2977 | if (should_queue) |
Chris Mason | 1cc127b | 2008-06-12 14:46:17 -0400 | [diff] [blame] | 2978 | btrfs_queue_worker(&root->fs_info->submit_workers, |
| 2979 | &device->work); |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2980 | return 0; |
| 2981 | } |
| 2982 | |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2983 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 2984 | int mirror_num, int async_submit) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2985 | { |
| 2986 | struct btrfs_mapping_tree *map_tree; |
| 2987 | struct btrfs_device *dev; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2988 | struct bio *first_bio = bio; |
Chris Mason | a62b940 | 2008-10-03 16:31:08 -0400 | [diff] [blame] | 2989 | u64 logical = (u64)bio->bi_sector << 9; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2990 | u64 length = 0; |
| 2991 | u64 map_length; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2992 | struct btrfs_multi_bio *multi = NULL; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2993 | int ret; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2994 | int dev_nr = 0; |
| 2995 | int total_devs = 1; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2996 | |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 2997 | length = bio->bi_size; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2998 | map_tree = &root->fs_info->mapping_tree; |
| 2999 | map_length = length; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 3000 | |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 3001 | ret = btrfs_map_block(map_tree, rw, logical, &map_length, &multi, |
| 3002 | mirror_num); |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 3003 | BUG_ON(ret); |
| 3004 | |
| 3005 | total_devs = multi->num_stripes; |
| 3006 | if (map_length < length) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3007 | printk(KERN_CRIT "mapping failed logical %llu bio len %llu " |
| 3008 | "len %llu\n", (unsigned long long)logical, |
| 3009 | (unsigned long long)length, |
| 3010 | (unsigned long long)map_length); |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 3011 | BUG(); |
| 3012 | } |
| 3013 | multi->end_io = first_bio->bi_end_io; |
| 3014 | multi->private = first_bio->bi_private; |
Chris Mason | 7d2b4da | 2008-08-05 10:13:57 -0400 | [diff] [blame] | 3015 | multi->orig_bio = first_bio; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 3016 | atomic_set(&multi->stripes_pending, multi->num_stripes); |
| 3017 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3018 | while (dev_nr < total_devs) { |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3019 | if (total_devs > 1) { |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3020 | if (dev_nr < total_devs - 1) { |
| 3021 | bio = bio_clone(first_bio, GFP_NOFS); |
| 3022 | BUG_ON(!bio); |
| 3023 | } else { |
| 3024 | bio = first_bio; |
| 3025 | } |
| 3026 | bio->bi_private = multi; |
| 3027 | bio->bi_end_io = end_bio_multi_stripe; |
| 3028 | } |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 3029 | bio->bi_sector = multi->stripes[dev_nr].physical >> 9; |
| 3030 | dev = multi->stripes[dev_nr].dev; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3031 | BUG_ON(rw == WRITE && !dev->writeable); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3032 | if (dev && dev->bdev) { |
| 3033 | bio->bi_bdev = dev->bdev; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 3034 | if (async_submit) |
| 3035 | schedule_bio(root, dev, rw, bio); |
| 3036 | else |
| 3037 | submit_bio(rw, bio); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3038 | } else { |
| 3039 | bio->bi_bdev = root->fs_info->fs_devices->latest_bdev; |
| 3040 | bio->bi_sector = logical >> 9; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3041 | bio_endio(bio, -EIO); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3042 | } |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3043 | dev_nr++; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 3044 | } |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 3045 | if (total_devs == 1) |
| 3046 | kfree(multi); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3047 | return 0; |
| 3048 | } |
| 3049 | |
Chris Mason | a443755 | 2008-04-18 10:29:38 -0400 | [diff] [blame] | 3050 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3051 | u8 *uuid, u8 *fsid) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3052 | { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3053 | struct btrfs_device *device; |
| 3054 | struct btrfs_fs_devices *cur_devices; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3055 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3056 | cur_devices = root->fs_info->fs_devices; |
| 3057 | while (cur_devices) { |
| 3058 | if (!fsid || |
| 3059 | !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) { |
| 3060 | device = __find_device(&cur_devices->devices, |
| 3061 | devid, uuid); |
| 3062 | if (device) |
| 3063 | return device; |
| 3064 | } |
| 3065 | cur_devices = cur_devices->seed; |
| 3066 | } |
| 3067 | return NULL; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3068 | } |
| 3069 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3070 | static struct btrfs_device *add_missing_dev(struct btrfs_root *root, |
| 3071 | u64 devid, u8 *dev_uuid) |
| 3072 | { |
| 3073 | struct btrfs_device *device; |
| 3074 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
| 3075 | |
| 3076 | device = kzalloc(sizeof(*device), GFP_NOFS); |
yanhai zhu | 7cbd8a8 | 2008-11-12 14:38:54 -0500 | [diff] [blame] | 3077 | if (!device) |
| 3078 | return NULL; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3079 | list_add(&device->dev_list, |
| 3080 | &fs_devices->devices); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3081 | device->barriers = 1; |
| 3082 | device->dev_root = root->fs_info->dev_root; |
| 3083 | device->devid = devid; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 3084 | device->work.func = pending_bios_fn; |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 3085 | device->fs_devices = fs_devices; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3086 | fs_devices->num_devices++; |
| 3087 | spin_lock_init(&device->io_lock); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 3088 | INIT_LIST_HEAD(&device->dev_alloc_list); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3089 | memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE); |
| 3090 | return device; |
| 3091 | } |
| 3092 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3093 | static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, |
| 3094 | struct extent_buffer *leaf, |
| 3095 | struct btrfs_chunk *chunk) |
| 3096 | { |
| 3097 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; |
| 3098 | struct map_lookup *map; |
| 3099 | struct extent_map *em; |
| 3100 | u64 logical; |
| 3101 | u64 length; |
| 3102 | u64 devid; |
Chris Mason | a443755 | 2008-04-18 10:29:38 -0400 | [diff] [blame] | 3103 | u8 uuid[BTRFS_UUID_SIZE]; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3104 | int num_stripes; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3105 | int ret; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3106 | int i; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3107 | |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 3108 | logical = key->offset; |
| 3109 | length = btrfs_chunk_length(leaf, chunk); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3110 | |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 3111 | read_lock(&map_tree->map_tree.lock); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3112 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 3113 | read_unlock(&map_tree->map_tree.lock); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3114 | |
| 3115 | /* already mapped? */ |
| 3116 | if (em && em->start <= logical && em->start + em->len > logical) { |
| 3117 | free_extent_map(em); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3118 | return 0; |
| 3119 | } else if (em) { |
| 3120 | free_extent_map(em); |
| 3121 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3122 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3123 | em = alloc_extent_map(GFP_NOFS); |
| 3124 | if (!em) |
| 3125 | return -ENOMEM; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3126 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); |
| 3127 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3128 | if (!map) { |
| 3129 | free_extent_map(em); |
| 3130 | return -ENOMEM; |
| 3131 | } |
| 3132 | |
| 3133 | em->bdev = (struct block_device *)map; |
| 3134 | em->start = logical; |
| 3135 | em->len = length; |
| 3136 | em->block_start = 0; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 3137 | em->block_len = em->len; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3138 | |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3139 | map->num_stripes = num_stripes; |
| 3140 | map->io_width = btrfs_chunk_io_width(leaf, chunk); |
| 3141 | map->io_align = btrfs_chunk_io_align(leaf, chunk); |
| 3142 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); |
| 3143 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); |
| 3144 | map->type = btrfs_chunk_type(leaf, chunk); |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 3145 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3146 | for (i = 0; i < num_stripes; i++) { |
| 3147 | map->stripes[i].physical = |
| 3148 | btrfs_stripe_offset_nr(leaf, chunk, i); |
| 3149 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); |
Chris Mason | a443755 | 2008-04-18 10:29:38 -0400 | [diff] [blame] | 3150 | read_extent_buffer(leaf, uuid, (unsigned long) |
| 3151 | btrfs_stripe_dev_uuid_nr(chunk, i), |
| 3152 | BTRFS_UUID_SIZE); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3153 | map->stripes[i].dev = btrfs_find_device(root, devid, uuid, |
| 3154 | NULL); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3155 | if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) { |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3156 | kfree(map); |
| 3157 | free_extent_map(em); |
| 3158 | return -EIO; |
| 3159 | } |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3160 | if (!map->stripes[i].dev) { |
| 3161 | map->stripes[i].dev = |
| 3162 | add_missing_dev(root, devid, uuid); |
| 3163 | if (!map->stripes[i].dev) { |
| 3164 | kfree(map); |
| 3165 | free_extent_map(em); |
| 3166 | return -EIO; |
| 3167 | } |
| 3168 | } |
| 3169 | map->stripes[i].dev->in_fs_metadata = 1; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3170 | } |
| 3171 | |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 3172 | write_lock(&map_tree->map_tree.lock); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3173 | ret = add_extent_mapping(&map_tree->map_tree, em); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 3174 | write_unlock(&map_tree->map_tree.lock); |
Chris Mason | b248a41 | 2008-04-14 09:48:18 -0400 | [diff] [blame] | 3175 | BUG_ON(ret); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3176 | free_extent_map(em); |
| 3177 | |
| 3178 | return 0; |
| 3179 | } |
| 3180 | |
| 3181 | static int fill_device_from_item(struct extent_buffer *leaf, |
| 3182 | struct btrfs_dev_item *dev_item, |
| 3183 | struct btrfs_device *device) |
| 3184 | { |
| 3185 | unsigned long ptr; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3186 | |
| 3187 | device->devid = btrfs_device_id(leaf, dev_item); |
Chris Ball | d6397ba | 2009-04-27 07:29:03 -0400 | [diff] [blame] | 3188 | device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item); |
| 3189 | device->total_bytes = device->disk_total_bytes; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3190 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); |
| 3191 | device->type = btrfs_device_type(leaf, dev_item); |
| 3192 | device->io_align = btrfs_device_io_align(leaf, dev_item); |
| 3193 | device->io_width = btrfs_device_io_width(leaf, dev_item); |
| 3194 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3195 | |
| 3196 | ptr = (unsigned long)btrfs_device_uuid(dev_item); |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 3197 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3198 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3199 | return 0; |
| 3200 | } |
| 3201 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3202 | static int open_seed_devices(struct btrfs_root *root, u8 *fsid) |
| 3203 | { |
| 3204 | struct btrfs_fs_devices *fs_devices; |
| 3205 | int ret; |
| 3206 | |
| 3207 | mutex_lock(&uuid_mutex); |
| 3208 | |
| 3209 | fs_devices = root->fs_info->fs_devices->seed; |
| 3210 | while (fs_devices) { |
| 3211 | if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) { |
| 3212 | ret = 0; |
| 3213 | goto out; |
| 3214 | } |
| 3215 | fs_devices = fs_devices->seed; |
| 3216 | } |
| 3217 | |
| 3218 | fs_devices = find_fsid(fsid); |
| 3219 | if (!fs_devices) { |
| 3220 | ret = -ENOENT; |
| 3221 | goto out; |
| 3222 | } |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 3223 | |
| 3224 | fs_devices = clone_fs_devices(fs_devices); |
| 3225 | if (IS_ERR(fs_devices)) { |
| 3226 | ret = PTR_ERR(fs_devices); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3227 | goto out; |
| 3228 | } |
| 3229 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 3230 | ret = __btrfs_open_devices(fs_devices, FMODE_READ, |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 3231 | root->fs_info->bdev_holder); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3232 | if (ret) |
| 3233 | goto out; |
| 3234 | |
| 3235 | if (!fs_devices->seeding) { |
| 3236 | __btrfs_close_devices(fs_devices); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 3237 | free_fs_devices(fs_devices); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3238 | ret = -EINVAL; |
| 3239 | goto out; |
| 3240 | } |
| 3241 | |
| 3242 | fs_devices->seed = root->fs_info->fs_devices->seed; |
| 3243 | root->fs_info->fs_devices->seed = fs_devices; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3244 | out: |
| 3245 | mutex_unlock(&uuid_mutex); |
| 3246 | return ret; |
| 3247 | } |
| 3248 | |
Chris Mason | 0d81ba5 | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 3249 | static int read_one_dev(struct btrfs_root *root, |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3250 | struct extent_buffer *leaf, |
| 3251 | struct btrfs_dev_item *dev_item) |
| 3252 | { |
| 3253 | struct btrfs_device *device; |
| 3254 | u64 devid; |
| 3255 | int ret; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3256 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
Chris Mason | a443755 | 2008-04-18 10:29:38 -0400 | [diff] [blame] | 3257 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
| 3258 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3259 | devid = btrfs_device_id(leaf, dev_item); |
Chris Mason | a443755 | 2008-04-18 10:29:38 -0400 | [diff] [blame] | 3260 | read_extent_buffer(leaf, dev_uuid, |
| 3261 | (unsigned long)btrfs_device_uuid(dev_item), |
| 3262 | BTRFS_UUID_SIZE); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3263 | read_extent_buffer(leaf, fs_uuid, |
| 3264 | (unsigned long)btrfs_device_fsid(dev_item), |
| 3265 | BTRFS_UUID_SIZE); |
| 3266 | |
| 3267 | if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) { |
| 3268 | ret = open_seed_devices(root, fs_uuid); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 3269 | if (ret && !btrfs_test_opt(root, DEGRADED)) |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3270 | return ret; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3271 | } |
| 3272 | |
| 3273 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); |
| 3274 | if (!device || !device->bdev) { |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 3275 | if (!btrfs_test_opt(root, DEGRADED)) |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3276 | return -EIO; |
| 3277 | |
| 3278 | if (!device) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3279 | printk(KERN_WARNING "warning devid %llu missing\n", |
| 3280 | (unsigned long long)devid); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3281 | device = add_missing_dev(root, devid, dev_uuid); |
| 3282 | if (!device) |
| 3283 | return -ENOMEM; |
| 3284 | } |
| 3285 | } |
| 3286 | |
| 3287 | if (device->fs_devices != root->fs_info->fs_devices) { |
| 3288 | BUG_ON(device->writeable); |
| 3289 | if (device->generation != |
| 3290 | btrfs_device_generation(leaf, dev_item)) |
| 3291 | return -EINVAL; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3292 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3293 | |
| 3294 | fill_device_from_item(leaf, dev_item, device); |
| 3295 | device->dev_root = root->fs_info->dev_root; |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 3296 | device->in_fs_metadata = 1; |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3297 | if (device->writeable) |
| 3298 | device->fs_devices->total_rw_bytes += device->total_bytes; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3299 | ret = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3300 | return ret; |
| 3301 | } |
| 3302 | |
Chris Mason | 0d81ba5 | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 3303 | int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf) |
| 3304 | { |
| 3305 | struct btrfs_dev_item *dev_item; |
| 3306 | |
| 3307 | dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block, |
| 3308 | dev_item); |
| 3309 | return read_one_dev(root, buf, dev_item); |
| 3310 | } |
| 3311 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 3312 | int btrfs_read_sys_array(struct btrfs_root *root) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3313 | { |
| 3314 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3315 | struct extent_buffer *sb; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3316 | struct btrfs_disk_key *disk_key; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3317 | struct btrfs_chunk *chunk; |
Chris Mason | 84eed90 | 2008-04-25 09:04:37 -0400 | [diff] [blame] | 3318 | u8 *ptr; |
| 3319 | unsigned long sb_ptr; |
| 3320 | int ret = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3321 | u32 num_stripes; |
| 3322 | u32 array_size; |
| 3323 | u32 len = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3324 | u32 cur; |
Chris Mason | 84eed90 | 2008-04-25 09:04:37 -0400 | [diff] [blame] | 3325 | struct btrfs_key key; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3326 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 3327 | sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET, |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3328 | BTRFS_SUPER_INFO_SIZE); |
| 3329 | if (!sb) |
| 3330 | return -ENOMEM; |
| 3331 | btrfs_set_buffer_uptodate(sb); |
Chris Mason | 4008c04 | 2009-02-12 14:09:45 -0500 | [diff] [blame] | 3332 | btrfs_set_buffer_lockdep_class(sb, 0); |
| 3333 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3334 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3335 | array_size = btrfs_super_sys_array_size(super_copy); |
| 3336 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3337 | ptr = super_copy->sys_chunk_array; |
| 3338 | sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array); |
| 3339 | cur = 0; |
| 3340 | |
| 3341 | while (cur < array_size) { |
| 3342 | disk_key = (struct btrfs_disk_key *)ptr; |
| 3343 | btrfs_disk_key_to_cpu(&key, disk_key); |
| 3344 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3345 | len = sizeof(*disk_key); ptr += len; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3346 | sb_ptr += len; |
| 3347 | cur += len; |
| 3348 | |
Chris Mason | 0d81ba5 | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 3349 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3350 | chunk = (struct btrfs_chunk *)sb_ptr; |
Chris Mason | 0d81ba5 | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 3351 | ret = read_one_chunk(root, &key, sb, chunk); |
Chris Mason | 84eed90 | 2008-04-25 09:04:37 -0400 | [diff] [blame] | 3352 | if (ret) |
| 3353 | break; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3354 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); |
| 3355 | len = btrfs_chunk_item_size(num_stripes); |
| 3356 | } else { |
Chris Mason | 84eed90 | 2008-04-25 09:04:37 -0400 | [diff] [blame] | 3357 | ret = -EIO; |
| 3358 | break; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3359 | } |
| 3360 | ptr += len; |
| 3361 | sb_ptr += len; |
| 3362 | cur += len; |
| 3363 | } |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3364 | free_extent_buffer(sb); |
Chris Mason | 84eed90 | 2008-04-25 09:04:37 -0400 | [diff] [blame] | 3365 | return ret; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3366 | } |
| 3367 | |
| 3368 | int btrfs_read_chunk_tree(struct btrfs_root *root) |
| 3369 | { |
| 3370 | struct btrfs_path *path; |
| 3371 | struct extent_buffer *leaf; |
| 3372 | struct btrfs_key key; |
| 3373 | struct btrfs_key found_key; |
| 3374 | int ret; |
| 3375 | int slot; |
| 3376 | |
| 3377 | root = root->fs_info->chunk_root; |
| 3378 | |
| 3379 | path = btrfs_alloc_path(); |
| 3380 | if (!path) |
| 3381 | return -ENOMEM; |
| 3382 | |
| 3383 | /* first we search for all of the device items, and then we |
| 3384 | * read in all of the chunk items. This way we can create chunk |
| 3385 | * mappings that reference all of the devices that are afound |
| 3386 | */ |
| 3387 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
| 3388 | key.offset = 0; |
| 3389 | key.type = 0; |
| 3390 | again: |
| 3391 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3392 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3393 | leaf = path->nodes[0]; |
| 3394 | slot = path->slots[0]; |
| 3395 | if (slot >= btrfs_header_nritems(leaf)) { |
| 3396 | ret = btrfs_next_leaf(root, path); |
| 3397 | if (ret == 0) |
| 3398 | continue; |
| 3399 | if (ret < 0) |
| 3400 | goto error; |
| 3401 | break; |
| 3402 | } |
| 3403 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 3404 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { |
| 3405 | if (found_key.objectid != BTRFS_DEV_ITEMS_OBJECTID) |
| 3406 | break; |
| 3407 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { |
| 3408 | struct btrfs_dev_item *dev_item; |
| 3409 | dev_item = btrfs_item_ptr(leaf, slot, |
| 3410 | struct btrfs_dev_item); |
Chris Mason | 0d81ba5 | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 3411 | ret = read_one_dev(root, leaf, dev_item); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3412 | if (ret) |
| 3413 | goto error; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3414 | } |
| 3415 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { |
| 3416 | struct btrfs_chunk *chunk; |
| 3417 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); |
| 3418 | ret = read_one_chunk(root, &found_key, leaf, chunk); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3419 | if (ret) |
| 3420 | goto error; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3421 | } |
| 3422 | path->slots[0]++; |
| 3423 | } |
| 3424 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { |
| 3425 | key.objectid = 0; |
| 3426 | btrfs_release_path(root, path); |
| 3427 | goto again; |
| 3428 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3429 | ret = 0; |
| 3430 | error: |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3431 | btrfs_free_path(path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3432 | return ret; |
| 3433 | } |