Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Red Hat. 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 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 20 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 22 | #include <linux/math64.h> |
Josef Bacik | 6ab6060 | 2011-08-08 08:24:46 -0400 | [diff] [blame] | 23 | #include <linux/ratelimit.h> |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 24 | #include "ctree.h" |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 25 | #include "free-space-cache.h" |
| 26 | #include "transaction.h" |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 27 | #include "disk-io.h" |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 28 | #include "extent_io.h" |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 29 | #include "inode-map.h" |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 30 | #include "volumes.h" |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 31 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 32 | #define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8) |
| 33 | #define MAX_CACHE_BYTES_PER_GIG (32 * 1024) |
| 34 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 35 | struct btrfs_trim_range { |
| 36 | u64 start; |
| 37 | u64 bytes; |
| 38 | struct list_head list; |
| 39 | }; |
| 40 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 41 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 42 | struct btrfs_free_space *info); |
Josef Bacik | cd023e7 | 2012-05-14 10:06:40 -0400 | [diff] [blame] | 43 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
| 44 | struct btrfs_free_space *info); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 45 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 46 | static struct inode *__lookup_free_space_inode(struct btrfs_root *root, |
| 47 | struct btrfs_path *path, |
| 48 | u64 offset) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 49 | { |
| 50 | struct btrfs_key key; |
| 51 | struct btrfs_key location; |
| 52 | struct btrfs_disk_key disk_key; |
| 53 | struct btrfs_free_space_header *header; |
| 54 | struct extent_buffer *leaf; |
| 55 | struct inode *inode = NULL; |
| 56 | int ret; |
| 57 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 58 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 59 | key.offset = offset; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 60 | key.type = 0; |
| 61 | |
| 62 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 63 | if (ret < 0) |
| 64 | return ERR_PTR(ret); |
| 65 | if (ret > 0) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 66 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 67 | return ERR_PTR(-ENOENT); |
| 68 | } |
| 69 | |
| 70 | leaf = path->nodes[0]; |
| 71 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 72 | struct btrfs_free_space_header); |
| 73 | btrfs_free_space_key(leaf, header, &disk_key); |
| 74 | btrfs_disk_key_to_cpu(&location, &disk_key); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 75 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 76 | |
| 77 | inode = btrfs_iget(root->fs_info->sb, &location, root, NULL); |
| 78 | if (!inode) |
| 79 | return ERR_PTR(-ENOENT); |
| 80 | if (IS_ERR(inode)) |
| 81 | return inode; |
| 82 | if (is_bad_inode(inode)) { |
| 83 | iput(inode); |
| 84 | return ERR_PTR(-ENOENT); |
| 85 | } |
| 86 | |
Al Viro | 528c032 | 2012-04-13 11:03:55 -0400 | [diff] [blame] | 87 | mapping_set_gfp_mask(inode->i_mapping, |
| 88 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); |
Miao Xie | adae52b | 2011-03-31 09:43:23 +0000 | [diff] [blame] | 89 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 90 | return inode; |
| 91 | } |
| 92 | |
| 93 | struct inode *lookup_free_space_inode(struct btrfs_root *root, |
| 94 | struct btrfs_block_group_cache |
| 95 | *block_group, struct btrfs_path *path) |
| 96 | { |
| 97 | struct inode *inode = NULL; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 98 | u32 flags = BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 99 | |
| 100 | spin_lock(&block_group->lock); |
| 101 | if (block_group->inode) |
| 102 | inode = igrab(block_group->inode); |
| 103 | spin_unlock(&block_group->lock); |
| 104 | if (inode) |
| 105 | return inode; |
| 106 | |
| 107 | inode = __lookup_free_space_inode(root, path, |
| 108 | block_group->key.objectid); |
| 109 | if (IS_ERR(inode)) |
| 110 | return inode; |
| 111 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 112 | spin_lock(&block_group->lock); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 113 | if (!((BTRFS_I(inode)->flags & flags) == flags)) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 114 | btrfs_info(root->fs_info, |
| 115 | "Old style space inode found, converting."); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 116 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM | |
| 117 | BTRFS_INODE_NODATACOW; |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 118 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
| 119 | } |
| 120 | |
Josef Bacik | 300e4f8 | 2011-08-29 14:06:00 -0400 | [diff] [blame] | 121 | if (!block_group->iref) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 122 | block_group->inode = igrab(inode); |
| 123 | block_group->iref = 1; |
| 124 | } |
| 125 | spin_unlock(&block_group->lock); |
| 126 | |
| 127 | return inode; |
| 128 | } |
| 129 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 130 | static int __create_free_space_inode(struct btrfs_root *root, |
| 131 | struct btrfs_trans_handle *trans, |
| 132 | struct btrfs_path *path, |
| 133 | u64 ino, u64 offset) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 134 | { |
| 135 | struct btrfs_key key; |
| 136 | struct btrfs_disk_key disk_key; |
| 137 | struct btrfs_free_space_header *header; |
| 138 | struct btrfs_inode_item *inode_item; |
| 139 | struct extent_buffer *leaf; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 140 | u64 flags = BTRFS_INODE_NOCOMPRESS | BTRFS_INODE_PREALLOC; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 141 | int ret; |
| 142 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 143 | ret = btrfs_insert_empty_inode(trans, root, path, ino); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 144 | if (ret) |
| 145 | return ret; |
| 146 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 147 | /* We inline crc's for the free disk space cache */ |
| 148 | if (ino != BTRFS_FREE_INO_OBJECTID) |
| 149 | flags |= BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; |
| 150 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 151 | leaf = path->nodes[0]; |
| 152 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
| 153 | struct btrfs_inode_item); |
| 154 | btrfs_item_key(leaf, &disk_key, path->slots[0]); |
| 155 | memset_extent_buffer(leaf, 0, (unsigned long)inode_item, |
| 156 | sizeof(*inode_item)); |
| 157 | btrfs_set_inode_generation(leaf, inode_item, trans->transid); |
| 158 | btrfs_set_inode_size(leaf, inode_item, 0); |
| 159 | btrfs_set_inode_nbytes(leaf, inode_item, 0); |
| 160 | btrfs_set_inode_uid(leaf, inode_item, 0); |
| 161 | btrfs_set_inode_gid(leaf, inode_item, 0); |
| 162 | btrfs_set_inode_mode(leaf, inode_item, S_IFREG | 0600); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 163 | btrfs_set_inode_flags(leaf, inode_item, flags); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 164 | btrfs_set_inode_nlink(leaf, inode_item, 1); |
| 165 | btrfs_set_inode_transid(leaf, inode_item, trans->transid); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 166 | btrfs_set_inode_block_group(leaf, inode_item, offset); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 167 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 168 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 169 | |
| 170 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 171 | key.offset = offset; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 172 | key.type = 0; |
| 173 | |
| 174 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 175 | sizeof(struct btrfs_free_space_header)); |
| 176 | if (ret < 0) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 177 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 178 | return ret; |
| 179 | } |
| 180 | leaf = path->nodes[0]; |
| 181 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 182 | struct btrfs_free_space_header); |
| 183 | memset_extent_buffer(leaf, 0, (unsigned long)header, sizeof(*header)); |
| 184 | btrfs_set_free_space_key(leaf, header, &disk_key); |
| 185 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 186 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 187 | |
| 188 | return 0; |
| 189 | } |
| 190 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 191 | int create_free_space_inode(struct btrfs_root *root, |
| 192 | struct btrfs_trans_handle *trans, |
| 193 | struct btrfs_block_group_cache *block_group, |
| 194 | struct btrfs_path *path) |
| 195 | { |
| 196 | int ret; |
| 197 | u64 ino; |
| 198 | |
| 199 | ret = btrfs_find_free_objectid(root, &ino); |
| 200 | if (ret < 0) |
| 201 | return ret; |
| 202 | |
| 203 | return __create_free_space_inode(root, trans, path, ino, |
| 204 | block_group->key.objectid); |
| 205 | } |
| 206 | |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 207 | int btrfs_check_trunc_cache_free_space(struct btrfs_root *root, |
| 208 | struct btrfs_block_rsv *rsv) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 209 | { |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 210 | u64 needed_bytes; |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 211 | int ret; |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 212 | |
| 213 | /* 1 for slack space, 1 for updating the inode */ |
| 214 | needed_bytes = btrfs_calc_trunc_metadata_size(root, 1) + |
| 215 | btrfs_calc_trans_metadata_size(root, 1); |
| 216 | |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 217 | spin_lock(&rsv->lock); |
| 218 | if (rsv->reserved < needed_bytes) |
| 219 | ret = -ENOSPC; |
| 220 | else |
| 221 | ret = 0; |
| 222 | spin_unlock(&rsv->lock); |
Wei Yongjun | 4b286cd | 2013-05-21 02:39:21 +0000 | [diff] [blame] | 223 | return ret; |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | int btrfs_truncate_free_space_cache(struct btrfs_root *root, |
| 227 | struct btrfs_trans_handle *trans, |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 228 | struct inode *inode) |
| 229 | { |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 230 | int ret = 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 231 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 232 | btrfs_i_size_write(inode, 0); |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame] | 233 | truncate_pagecache(inode, 0); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 234 | |
| 235 | /* |
| 236 | * We don't need an orphan item because truncating the free space cache |
| 237 | * will never be split across transactions. |
Chris Mason | 28ed134 | 2014-12-17 09:41:04 -0800 | [diff] [blame^] | 238 | * We don't need to check for -EAGAIN because we're a free space |
| 239 | * cache inode |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 240 | */ |
| 241 | ret = btrfs_truncate_inode_items(trans, root, inode, |
| 242 | 0, BTRFS_EXTENT_DATA_KEY); |
| 243 | if (ret) { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 244 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 245 | return ret; |
| 246 | } |
| 247 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 248 | ret = btrfs_update_inode(trans, root, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 249 | if (ret) |
| 250 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 251 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 252 | return ret; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 253 | } |
| 254 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 255 | static int readahead_cache(struct inode *inode) |
| 256 | { |
| 257 | struct file_ra_state *ra; |
| 258 | unsigned long last_index; |
| 259 | |
| 260 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
| 261 | if (!ra) |
| 262 | return -ENOMEM; |
| 263 | |
| 264 | file_ra_state_init(ra, inode->i_mapping); |
| 265 | last_index = (i_size_read(inode) - 1) >> PAGE_CACHE_SHIFT; |
| 266 | |
| 267 | page_cache_sync_readahead(inode->i_mapping, ra, NULL, 0, last_index); |
| 268 | |
| 269 | kfree(ra); |
| 270 | |
| 271 | return 0; |
| 272 | } |
| 273 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 274 | struct io_ctl { |
| 275 | void *cur, *orig; |
| 276 | struct page *page; |
| 277 | struct page **pages; |
| 278 | struct btrfs_root *root; |
| 279 | unsigned long size; |
| 280 | int index; |
| 281 | int num_pages; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 282 | unsigned check_crcs:1; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 283 | }; |
| 284 | |
| 285 | static int io_ctl_init(struct io_ctl *io_ctl, struct inode *inode, |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 286 | struct btrfs_root *root, int write) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 287 | { |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 288 | int num_pages; |
| 289 | int check_crcs = 0; |
| 290 | |
David Sterba | ed6078f | 2014-06-05 01:59:57 +0200 | [diff] [blame] | 291 | num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 292 | |
| 293 | if (btrfs_ino(inode) != BTRFS_FREE_INO_OBJECTID) |
| 294 | check_crcs = 1; |
| 295 | |
| 296 | /* Make sure we can fit our crcs into the first page */ |
| 297 | if (write && check_crcs && |
| 298 | (num_pages * sizeof(u32)) >= PAGE_CACHE_SIZE) |
| 299 | return -ENOSPC; |
| 300 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 301 | memset(io_ctl, 0, sizeof(struct io_ctl)); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 302 | |
David Sterba | 31e818f | 2015-02-20 18:00:26 +0100 | [diff] [blame] | 303 | io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 304 | if (!io_ctl->pages) |
| 305 | return -ENOMEM; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 306 | |
| 307 | io_ctl->num_pages = num_pages; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 308 | io_ctl->root = root; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 309 | io_ctl->check_crcs = check_crcs; |
| 310 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | static void io_ctl_free(struct io_ctl *io_ctl) |
| 315 | { |
| 316 | kfree(io_ctl->pages); |
| 317 | } |
| 318 | |
| 319 | static void io_ctl_unmap_page(struct io_ctl *io_ctl) |
| 320 | { |
| 321 | if (io_ctl->cur) { |
| 322 | kunmap(io_ctl->page); |
| 323 | io_ctl->cur = NULL; |
| 324 | io_ctl->orig = NULL; |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | static void io_ctl_map_page(struct io_ctl *io_ctl, int clear) |
| 329 | { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 330 | ASSERT(io_ctl->index < io_ctl->num_pages); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 331 | io_ctl->page = io_ctl->pages[io_ctl->index++]; |
| 332 | io_ctl->cur = kmap(io_ctl->page); |
| 333 | io_ctl->orig = io_ctl->cur; |
| 334 | io_ctl->size = PAGE_CACHE_SIZE; |
| 335 | if (clear) |
| 336 | memset(io_ctl->cur, 0, PAGE_CACHE_SIZE); |
| 337 | } |
| 338 | |
| 339 | static void io_ctl_drop_pages(struct io_ctl *io_ctl) |
| 340 | { |
| 341 | int i; |
| 342 | |
| 343 | io_ctl_unmap_page(io_ctl); |
| 344 | |
| 345 | for (i = 0; i < io_ctl->num_pages; i++) { |
Li Zefan | a1ee5a4 | 2012-01-09 14:27:42 +0800 | [diff] [blame] | 346 | if (io_ctl->pages[i]) { |
| 347 | ClearPageChecked(io_ctl->pages[i]); |
| 348 | unlock_page(io_ctl->pages[i]); |
| 349 | page_cache_release(io_ctl->pages[i]); |
| 350 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 351 | } |
| 352 | } |
| 353 | |
| 354 | static int io_ctl_prepare_pages(struct io_ctl *io_ctl, struct inode *inode, |
| 355 | int uptodate) |
| 356 | { |
| 357 | struct page *page; |
| 358 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
| 359 | int i; |
| 360 | |
| 361 | for (i = 0; i < io_ctl->num_pages; i++) { |
| 362 | page = find_or_create_page(inode->i_mapping, i, mask); |
| 363 | if (!page) { |
| 364 | io_ctl_drop_pages(io_ctl); |
| 365 | return -ENOMEM; |
| 366 | } |
| 367 | io_ctl->pages[i] = page; |
| 368 | if (uptodate && !PageUptodate(page)) { |
| 369 | btrfs_readpage(NULL, page); |
| 370 | lock_page(page); |
| 371 | if (!PageUptodate(page)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 372 | btrfs_err(BTRFS_I(inode)->root->fs_info, |
| 373 | "error reading free space cache"); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 374 | io_ctl_drop_pages(io_ctl); |
| 375 | return -EIO; |
| 376 | } |
| 377 | } |
| 378 | } |
| 379 | |
Josef Bacik | f7d61dc | 2011-11-15 09:31:24 -0500 | [diff] [blame] | 380 | for (i = 0; i < io_ctl->num_pages; i++) { |
| 381 | clear_page_dirty_for_io(io_ctl->pages[i]); |
| 382 | set_page_extent_mapped(io_ctl->pages[i]); |
| 383 | } |
| 384 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 385 | return 0; |
| 386 | } |
| 387 | |
| 388 | static void io_ctl_set_generation(struct io_ctl *io_ctl, u64 generation) |
| 389 | { |
Al Viro | 528c032 | 2012-04-13 11:03:55 -0400 | [diff] [blame] | 390 | __le64 *val; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 391 | |
| 392 | io_ctl_map_page(io_ctl, 1); |
| 393 | |
| 394 | /* |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 395 | * Skip the csum areas. If we don't check crcs then we just have a |
| 396 | * 64bit chunk at the front of the first page. |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 397 | */ |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 398 | if (io_ctl->check_crcs) { |
| 399 | io_ctl->cur += (sizeof(u32) * io_ctl->num_pages); |
| 400 | io_ctl->size -= sizeof(u64) + (sizeof(u32) * io_ctl->num_pages); |
| 401 | } else { |
| 402 | io_ctl->cur += sizeof(u64); |
| 403 | io_ctl->size -= sizeof(u64) * 2; |
| 404 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 405 | |
| 406 | val = io_ctl->cur; |
| 407 | *val = cpu_to_le64(generation); |
| 408 | io_ctl->cur += sizeof(u64); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 409 | } |
| 410 | |
| 411 | static int io_ctl_check_generation(struct io_ctl *io_ctl, u64 generation) |
| 412 | { |
Al Viro | 528c032 | 2012-04-13 11:03:55 -0400 | [diff] [blame] | 413 | __le64 *gen; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 414 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 415 | /* |
| 416 | * Skip the crc area. If we don't check crcs then we just have a 64bit |
| 417 | * chunk at the front of the first page. |
| 418 | */ |
| 419 | if (io_ctl->check_crcs) { |
| 420 | io_ctl->cur += sizeof(u32) * io_ctl->num_pages; |
| 421 | io_ctl->size -= sizeof(u64) + |
| 422 | (sizeof(u32) * io_ctl->num_pages); |
| 423 | } else { |
| 424 | io_ctl->cur += sizeof(u64); |
| 425 | io_ctl->size -= sizeof(u64) * 2; |
| 426 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 427 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 428 | gen = io_ctl->cur; |
| 429 | if (le64_to_cpu(*gen) != generation) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 430 | printk_ratelimited(KERN_ERR "BTRFS: space cache generation " |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 431 | "(%Lu) does not match inode (%Lu)\n", *gen, |
| 432 | generation); |
| 433 | io_ctl_unmap_page(io_ctl); |
| 434 | return -EIO; |
| 435 | } |
| 436 | io_ctl->cur += sizeof(u64); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 437 | return 0; |
| 438 | } |
| 439 | |
| 440 | static void io_ctl_set_crc(struct io_ctl *io_ctl, int index) |
| 441 | { |
| 442 | u32 *tmp; |
| 443 | u32 crc = ~(u32)0; |
| 444 | unsigned offset = 0; |
| 445 | |
| 446 | if (!io_ctl->check_crcs) { |
| 447 | io_ctl_unmap_page(io_ctl); |
| 448 | return; |
| 449 | } |
| 450 | |
| 451 | if (index == 0) |
Justin P. Mattock | cb54f25 | 2011-11-21 08:43:28 -0800 | [diff] [blame] | 452 | offset = sizeof(u32) * io_ctl->num_pages; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 453 | |
Liu Bo | b049668 | 2013-03-14 14:57:45 +0000 | [diff] [blame] | 454 | crc = btrfs_csum_data(io_ctl->orig + offset, crc, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 455 | PAGE_CACHE_SIZE - offset); |
| 456 | btrfs_csum_final(crc, (char *)&crc); |
| 457 | io_ctl_unmap_page(io_ctl); |
| 458 | tmp = kmap(io_ctl->pages[0]); |
| 459 | tmp += index; |
| 460 | *tmp = crc; |
| 461 | kunmap(io_ctl->pages[0]); |
| 462 | } |
| 463 | |
| 464 | static int io_ctl_check_crc(struct io_ctl *io_ctl, int index) |
| 465 | { |
| 466 | u32 *tmp, val; |
| 467 | u32 crc = ~(u32)0; |
| 468 | unsigned offset = 0; |
| 469 | |
| 470 | if (!io_ctl->check_crcs) { |
| 471 | io_ctl_map_page(io_ctl, 0); |
| 472 | return 0; |
| 473 | } |
| 474 | |
| 475 | if (index == 0) |
| 476 | offset = sizeof(u32) * io_ctl->num_pages; |
| 477 | |
| 478 | tmp = kmap(io_ctl->pages[0]); |
| 479 | tmp += index; |
| 480 | val = *tmp; |
| 481 | kunmap(io_ctl->pages[0]); |
| 482 | |
| 483 | io_ctl_map_page(io_ctl, 0); |
Liu Bo | b049668 | 2013-03-14 14:57:45 +0000 | [diff] [blame] | 484 | crc = btrfs_csum_data(io_ctl->orig + offset, crc, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 485 | PAGE_CACHE_SIZE - offset); |
| 486 | btrfs_csum_final(crc, (char *)&crc); |
| 487 | if (val != crc) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 488 | printk_ratelimited(KERN_ERR "BTRFS: csum mismatch on free " |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 489 | "space cache\n"); |
| 490 | io_ctl_unmap_page(io_ctl); |
| 491 | return -EIO; |
| 492 | } |
| 493 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 494 | return 0; |
| 495 | } |
| 496 | |
| 497 | static int io_ctl_add_entry(struct io_ctl *io_ctl, u64 offset, u64 bytes, |
| 498 | void *bitmap) |
| 499 | { |
| 500 | struct btrfs_free_space_entry *entry; |
| 501 | |
| 502 | if (!io_ctl->cur) |
| 503 | return -ENOSPC; |
| 504 | |
| 505 | entry = io_ctl->cur; |
| 506 | entry->offset = cpu_to_le64(offset); |
| 507 | entry->bytes = cpu_to_le64(bytes); |
| 508 | entry->type = (bitmap) ? BTRFS_FREE_SPACE_BITMAP : |
| 509 | BTRFS_FREE_SPACE_EXTENT; |
| 510 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); |
| 511 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); |
| 512 | |
| 513 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) |
| 514 | return 0; |
| 515 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 516 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 517 | |
| 518 | /* No more pages to map */ |
| 519 | if (io_ctl->index >= io_ctl->num_pages) |
| 520 | return 0; |
| 521 | |
| 522 | /* map the next page */ |
| 523 | io_ctl_map_page(io_ctl, 1); |
| 524 | return 0; |
| 525 | } |
| 526 | |
| 527 | static int io_ctl_add_bitmap(struct io_ctl *io_ctl, void *bitmap) |
| 528 | { |
| 529 | if (!io_ctl->cur) |
| 530 | return -ENOSPC; |
| 531 | |
| 532 | /* |
| 533 | * If we aren't at the start of the current page, unmap this one and |
| 534 | * map the next one if there is any left. |
| 535 | */ |
| 536 | if (io_ctl->cur != io_ctl->orig) { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 537 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 538 | if (io_ctl->index >= io_ctl->num_pages) |
| 539 | return -ENOSPC; |
| 540 | io_ctl_map_page(io_ctl, 0); |
| 541 | } |
| 542 | |
| 543 | memcpy(io_ctl->cur, bitmap, PAGE_CACHE_SIZE); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 544 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 545 | if (io_ctl->index < io_ctl->num_pages) |
| 546 | io_ctl_map_page(io_ctl, 0); |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | static void io_ctl_zero_remaining_pages(struct io_ctl *io_ctl) |
| 551 | { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 552 | /* |
| 553 | * If we're not on the boundary we know we've modified the page and we |
| 554 | * need to crc the page. |
| 555 | */ |
| 556 | if (io_ctl->cur != io_ctl->orig) |
| 557 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
| 558 | else |
| 559 | io_ctl_unmap_page(io_ctl); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 560 | |
| 561 | while (io_ctl->index < io_ctl->num_pages) { |
| 562 | io_ctl_map_page(io_ctl, 1); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 563 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 564 | } |
| 565 | } |
| 566 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 567 | static int io_ctl_read_entry(struct io_ctl *io_ctl, |
| 568 | struct btrfs_free_space *entry, u8 *type) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 569 | { |
| 570 | struct btrfs_free_space_entry *e; |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 571 | int ret; |
| 572 | |
| 573 | if (!io_ctl->cur) { |
| 574 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); |
| 575 | if (ret) |
| 576 | return ret; |
| 577 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 578 | |
| 579 | e = io_ctl->cur; |
| 580 | entry->offset = le64_to_cpu(e->offset); |
| 581 | entry->bytes = le64_to_cpu(e->bytes); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 582 | *type = e->type; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 583 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); |
| 584 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); |
| 585 | |
| 586 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 587 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 588 | |
| 589 | io_ctl_unmap_page(io_ctl); |
| 590 | |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 591 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 592 | } |
| 593 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 594 | static int io_ctl_read_bitmap(struct io_ctl *io_ctl, |
| 595 | struct btrfs_free_space *entry) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 596 | { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 597 | int ret; |
| 598 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 599 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); |
| 600 | if (ret) |
| 601 | return ret; |
| 602 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 603 | memcpy(entry->bitmap, io_ctl->cur, PAGE_CACHE_SIZE); |
| 604 | io_ctl_unmap_page(io_ctl); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 605 | |
| 606 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 607 | } |
| 608 | |
Josef Bacik | cd023e7 | 2012-05-14 10:06:40 -0400 | [diff] [blame] | 609 | /* |
| 610 | * Since we attach pinned extents after the fact we can have contiguous sections |
| 611 | * of free space that are split up in entries. This poses a problem with the |
| 612 | * tree logging stuff since it could have allocated across what appears to be 2 |
| 613 | * entries since we would have merged the entries when adding the pinned extents |
| 614 | * back to the free space cache. So run through the space cache that we just |
| 615 | * loaded and merge contiguous entries. This will make the log replay stuff not |
| 616 | * blow up and it will make for nicer allocator behavior. |
| 617 | */ |
| 618 | static void merge_space_tree(struct btrfs_free_space_ctl *ctl) |
| 619 | { |
| 620 | struct btrfs_free_space *e, *prev = NULL; |
| 621 | struct rb_node *n; |
| 622 | |
| 623 | again: |
| 624 | spin_lock(&ctl->tree_lock); |
| 625 | for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) { |
| 626 | e = rb_entry(n, struct btrfs_free_space, offset_index); |
| 627 | if (!prev) |
| 628 | goto next; |
| 629 | if (e->bitmap || prev->bitmap) |
| 630 | goto next; |
| 631 | if (prev->offset + prev->bytes == e->offset) { |
| 632 | unlink_free_space(ctl, prev); |
| 633 | unlink_free_space(ctl, e); |
| 634 | prev->bytes += e->bytes; |
| 635 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 636 | link_free_space(ctl, prev); |
| 637 | prev = NULL; |
| 638 | spin_unlock(&ctl->tree_lock); |
| 639 | goto again; |
| 640 | } |
| 641 | next: |
| 642 | prev = e; |
| 643 | } |
| 644 | spin_unlock(&ctl->tree_lock); |
| 645 | } |
| 646 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 647 | static int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, |
| 648 | struct btrfs_free_space_ctl *ctl, |
| 649 | struct btrfs_path *path, u64 offset) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 650 | { |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 651 | struct btrfs_free_space_header *header; |
| 652 | struct extent_buffer *leaf; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 653 | struct io_ctl io_ctl; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 654 | struct btrfs_key key; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 655 | struct btrfs_free_space *e, *n; |
Gui Hecheng | b76808f | 2014-12-31 09:51:35 +0800 | [diff] [blame] | 656 | LIST_HEAD(bitmaps); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 657 | u64 num_entries; |
| 658 | u64 num_bitmaps; |
| 659 | u64 generation; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 660 | u8 type; |
Josef Bacik | f6a3982 | 2011-06-06 10:50:35 -0400 | [diff] [blame] | 661 | int ret = 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 662 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 663 | /* Nothing in the space cache, goodbye */ |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 664 | if (!i_size_read(inode)) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 665 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 666 | |
| 667 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 668 | key.offset = offset; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 669 | key.type = 0; |
| 670 | |
| 671 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 672 | if (ret < 0) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 673 | return 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 674 | else if (ret > 0) { |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 675 | btrfs_release_path(path); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 676 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 677 | } |
| 678 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 679 | ret = -1; |
| 680 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 681 | leaf = path->nodes[0]; |
| 682 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 683 | struct btrfs_free_space_header); |
| 684 | num_entries = btrfs_free_space_entries(leaf, header); |
| 685 | num_bitmaps = btrfs_free_space_bitmaps(leaf, header); |
| 686 | generation = btrfs_free_space_generation(leaf, header); |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 687 | btrfs_release_path(path); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 688 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 689 | if (!BTRFS_I(inode)->generation) { |
| 690 | btrfs_info(root->fs_info, |
| 691 | "The free space cache file (%llu) is invalid. skip it\n", |
| 692 | offset); |
| 693 | return 0; |
| 694 | } |
| 695 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 696 | if (BTRFS_I(inode)->generation != generation) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 697 | btrfs_err(root->fs_info, |
| 698 | "free space inode generation (%llu) " |
| 699 | "did not match free space cache generation (%llu)", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 700 | BTRFS_I(inode)->generation, generation); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 701 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 702 | } |
| 703 | |
| 704 | if (!num_entries) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 705 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 706 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 707 | ret = io_ctl_init(&io_ctl, inode, root, 0); |
Li Zefan | 706efc6 | 2012-01-09 14:36:28 +0800 | [diff] [blame] | 708 | if (ret) |
| 709 | return ret; |
| 710 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 711 | ret = readahead_cache(inode); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 712 | if (ret) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 713 | goto out; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 714 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 715 | ret = io_ctl_prepare_pages(&io_ctl, inode, 1); |
| 716 | if (ret) |
| 717 | goto out; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 718 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 719 | ret = io_ctl_check_crc(&io_ctl, 0); |
| 720 | if (ret) |
| 721 | goto free_cache; |
| 722 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 723 | ret = io_ctl_check_generation(&io_ctl, generation); |
| 724 | if (ret) |
| 725 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 726 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 727 | while (num_entries) { |
| 728 | e = kmem_cache_zalloc(btrfs_free_space_cachep, |
| 729 | GFP_NOFS); |
| 730 | if (!e) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 731 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 732 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 733 | ret = io_ctl_read_entry(&io_ctl, e, &type); |
| 734 | if (ret) { |
| 735 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 736 | goto free_cache; |
| 737 | } |
| 738 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 739 | if (!e->bytes) { |
| 740 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 741 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 742 | } |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 743 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 744 | if (type == BTRFS_FREE_SPACE_EXTENT) { |
| 745 | spin_lock(&ctl->tree_lock); |
| 746 | ret = link_free_space(ctl, e); |
| 747 | spin_unlock(&ctl->tree_lock); |
| 748 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 749 | btrfs_err(root->fs_info, |
| 750 | "Duplicate entries in free space cache, dumping"); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 751 | kmem_cache_free(btrfs_free_space_cachep, e); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 752 | goto free_cache; |
| 753 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 754 | } else { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 755 | ASSERT(num_bitmaps); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 756 | num_bitmaps--; |
| 757 | e->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
| 758 | if (!e->bitmap) { |
| 759 | kmem_cache_free( |
| 760 | btrfs_free_space_cachep, e); |
| 761 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 762 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 763 | spin_lock(&ctl->tree_lock); |
| 764 | ret = link_free_space(ctl, e); |
| 765 | ctl->total_bitmaps++; |
| 766 | ctl->op->recalc_thresholds(ctl); |
| 767 | spin_unlock(&ctl->tree_lock); |
| 768 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 769 | btrfs_err(root->fs_info, |
| 770 | "Duplicate entries in free space cache, dumping"); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 771 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 772 | goto free_cache; |
| 773 | } |
| 774 | list_add_tail(&e->list, &bitmaps); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 775 | } |
| 776 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 777 | num_entries--; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 778 | } |
| 779 | |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 780 | io_ctl_unmap_page(&io_ctl); |
| 781 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 782 | /* |
| 783 | * We add the bitmaps at the end of the entries in order that |
| 784 | * the bitmap entries are added to the cache. |
| 785 | */ |
| 786 | list_for_each_entry_safe(e, n, &bitmaps, list) { |
| 787 | list_del_init(&e->list); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 788 | ret = io_ctl_read_bitmap(&io_ctl, e); |
| 789 | if (ret) |
| 790 | goto free_cache; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 791 | } |
| 792 | |
| 793 | io_ctl_drop_pages(&io_ctl); |
Josef Bacik | cd023e7 | 2012-05-14 10:06:40 -0400 | [diff] [blame] | 794 | merge_space_tree(ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 795 | ret = 1; |
| 796 | out: |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 797 | io_ctl_free(&io_ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 798 | return ret; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 799 | free_cache: |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 800 | io_ctl_drop_pages(&io_ctl); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 801 | __btrfs_remove_free_space_cache(ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 802 | goto out; |
| 803 | } |
| 804 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 805 | int load_free_space_cache(struct btrfs_fs_info *fs_info, |
| 806 | struct btrfs_block_group_cache *block_group) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 807 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 808 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 809 | struct btrfs_root *root = fs_info->tree_root; |
| 810 | struct inode *inode; |
| 811 | struct btrfs_path *path; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 812 | int ret = 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 813 | bool matched; |
| 814 | u64 used = btrfs_block_group_used(&block_group->item); |
| 815 | |
| 816 | /* |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 817 | * If this block group has been marked to be cleared for one reason or |
| 818 | * another then we can't trust the on disk cache, so just return. |
| 819 | */ |
| 820 | spin_lock(&block_group->lock); |
| 821 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
| 822 | spin_unlock(&block_group->lock); |
| 823 | return 0; |
| 824 | } |
| 825 | spin_unlock(&block_group->lock); |
| 826 | |
| 827 | path = btrfs_alloc_path(); |
| 828 | if (!path) |
| 829 | return 0; |
Josef Bacik | d53ba47 | 2012-04-12 16:03:57 -0400 | [diff] [blame] | 830 | path->search_commit_root = 1; |
| 831 | path->skip_locking = 1; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 832 | |
| 833 | inode = lookup_free_space_inode(root, block_group, path); |
| 834 | if (IS_ERR(inode)) { |
| 835 | btrfs_free_path(path); |
| 836 | return 0; |
| 837 | } |
| 838 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 839 | /* We may have converted the inode and made the cache invalid. */ |
| 840 | spin_lock(&block_group->lock); |
| 841 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
| 842 | spin_unlock(&block_group->lock); |
Tsutomu Itoh | a7e221e | 2012-02-14 17:12:23 +0900 | [diff] [blame] | 843 | btrfs_free_path(path); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 844 | goto out; |
| 845 | } |
| 846 | spin_unlock(&block_group->lock); |
| 847 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 848 | ret = __load_free_space_cache(fs_info->tree_root, inode, ctl, |
| 849 | path, block_group->key.objectid); |
| 850 | btrfs_free_path(path); |
| 851 | if (ret <= 0) |
| 852 | goto out; |
| 853 | |
| 854 | spin_lock(&ctl->tree_lock); |
| 855 | matched = (ctl->free_space == (block_group->key.offset - used - |
| 856 | block_group->bytes_super)); |
| 857 | spin_unlock(&ctl->tree_lock); |
| 858 | |
| 859 | if (!matched) { |
| 860 | __btrfs_remove_free_space_cache(ctl); |
Miao Xie | 32d6b47 | 2014-04-24 13:31:55 +0800 | [diff] [blame] | 861 | btrfs_warn(fs_info, "block group %llu has wrong amount of free space", |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 862 | block_group->key.objectid); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 863 | ret = -1; |
| 864 | } |
| 865 | out: |
| 866 | if (ret < 0) { |
| 867 | /* This cache is bogus, make sure it gets cleared */ |
| 868 | spin_lock(&block_group->lock); |
| 869 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
| 870 | spin_unlock(&block_group->lock); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 871 | ret = 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 872 | |
Miao Xie | 32d6b47 | 2014-04-24 13:31:55 +0800 | [diff] [blame] | 873 | btrfs_warn(fs_info, "failed to load free space cache for block group %llu, rebuild it now", |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 874 | block_group->key.objectid); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 875 | } |
| 876 | |
| 877 | iput(inode); |
| 878 | return ret; |
| 879 | } |
| 880 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 881 | static noinline_for_stack |
| 882 | int write_cache_extent_entries(struct io_ctl *io_ctl, |
| 883 | struct btrfs_free_space_ctl *ctl, |
| 884 | struct btrfs_block_group_cache *block_group, |
| 885 | int *entries, int *bitmaps, |
| 886 | struct list_head *bitmap_list) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 887 | { |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 888 | int ret; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 889 | struct btrfs_free_cluster *cluster = NULL; |
| 890 | struct rb_node *node = rb_first(&ctl->free_space_offset); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 891 | struct btrfs_trim_range *trim_entry; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 892 | |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 893 | /* Get the cluster for this block_group if it exists */ |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 894 | if (block_group && !list_empty(&block_group->cluster_list)) { |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 895 | cluster = list_entry(block_group->cluster_list.next, |
| 896 | struct btrfs_free_cluster, |
| 897 | block_group_list); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 898 | } |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 899 | |
Josef Bacik | f75b130 | 2011-10-05 10:00:18 -0400 | [diff] [blame] | 900 | if (!node && cluster) { |
| 901 | node = rb_first(&cluster->root); |
| 902 | cluster = NULL; |
| 903 | } |
| 904 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 905 | /* Write out the extent entries */ |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 906 | while (node) { |
| 907 | struct btrfs_free_space *e; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 908 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 909 | e = rb_entry(node, struct btrfs_free_space, offset_index); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 910 | *entries += 1; |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 911 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 912 | ret = io_ctl_add_entry(io_ctl, e->offset, e->bytes, |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 913 | e->bitmap); |
| 914 | if (ret) |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 915 | goto fail; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 916 | |
| 917 | if (e->bitmap) { |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 918 | list_add_tail(&e->list, bitmap_list); |
| 919 | *bitmaps += 1; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 920 | } |
| 921 | node = rb_next(node); |
| 922 | if (!node && cluster) { |
| 923 | node = rb_first(&cluster->root); |
| 924 | cluster = NULL; |
| 925 | } |
| 926 | } |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 927 | |
| 928 | /* |
| 929 | * Make sure we don't miss any range that was removed from our rbtree |
| 930 | * because trimming is running. Otherwise after a umount+mount (or crash |
| 931 | * after committing the transaction) we would leak free space and get |
| 932 | * an inconsistent free space cache report from fsck. |
| 933 | */ |
| 934 | list_for_each_entry(trim_entry, &ctl->trimming_ranges, list) { |
| 935 | ret = io_ctl_add_entry(io_ctl, trim_entry->start, |
| 936 | trim_entry->bytes, NULL); |
| 937 | if (ret) |
| 938 | goto fail; |
| 939 | *entries += 1; |
| 940 | } |
| 941 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 942 | return 0; |
| 943 | fail: |
| 944 | return -ENOSPC; |
| 945 | } |
| 946 | |
| 947 | static noinline_for_stack int |
| 948 | update_cache_item(struct btrfs_trans_handle *trans, |
| 949 | struct btrfs_root *root, |
| 950 | struct inode *inode, |
| 951 | struct btrfs_path *path, u64 offset, |
| 952 | int entries, int bitmaps) |
| 953 | { |
| 954 | struct btrfs_key key; |
| 955 | struct btrfs_free_space_header *header; |
| 956 | struct extent_buffer *leaf; |
| 957 | int ret; |
| 958 | |
| 959 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
| 960 | key.offset = offset; |
| 961 | key.type = 0; |
| 962 | |
| 963 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 964 | if (ret < 0) { |
| 965 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1, |
| 966 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL, |
| 967 | GFP_NOFS); |
| 968 | goto fail; |
| 969 | } |
| 970 | leaf = path->nodes[0]; |
| 971 | if (ret > 0) { |
| 972 | struct btrfs_key found_key; |
| 973 | ASSERT(path->slots[0]); |
| 974 | path->slots[0]--; |
| 975 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 976 | if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID || |
| 977 | found_key.offset != offset) { |
| 978 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, |
| 979 | inode->i_size - 1, |
| 980 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, |
| 981 | NULL, GFP_NOFS); |
| 982 | btrfs_release_path(path); |
| 983 | goto fail; |
| 984 | } |
| 985 | } |
| 986 | |
| 987 | BTRFS_I(inode)->generation = trans->transid; |
| 988 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 989 | struct btrfs_free_space_header); |
| 990 | btrfs_set_free_space_entries(leaf, header, entries); |
| 991 | btrfs_set_free_space_bitmaps(leaf, header, bitmaps); |
| 992 | btrfs_set_free_space_generation(leaf, header, trans->transid); |
| 993 | btrfs_mark_buffer_dirty(leaf); |
| 994 | btrfs_release_path(path); |
| 995 | |
| 996 | return 0; |
| 997 | |
| 998 | fail: |
| 999 | return -1; |
| 1000 | } |
| 1001 | |
| 1002 | static noinline_for_stack int |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1003 | write_pinned_extent_entries(struct btrfs_root *root, |
| 1004 | struct btrfs_block_group_cache *block_group, |
| 1005 | struct io_ctl *io_ctl, |
| 1006 | int *entries) |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1007 | { |
| 1008 | u64 start, extent_start, extent_end, len; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1009 | struct extent_io_tree *unpin = NULL; |
| 1010 | int ret; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1011 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1012 | if (!block_group) |
| 1013 | return 0; |
| 1014 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1015 | /* |
| 1016 | * We want to add any pinned extents to our free space cache |
| 1017 | * so we don't leak the space |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1018 | * |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1019 | * We shouldn't have switched the pinned extents yet so this is the |
| 1020 | * right one |
| 1021 | */ |
| 1022 | unpin = root->fs_info->pinned_extents; |
| 1023 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1024 | start = block_group->key.objectid; |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1025 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1026 | while (start < block_group->key.objectid + block_group->key.offset) { |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1027 | ret = find_first_extent_bit(unpin, start, |
| 1028 | &extent_start, &extent_end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 1029 | EXTENT_DIRTY, NULL); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1030 | if (ret) |
| 1031 | return 0; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 1032 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1033 | /* This pinned extent is out of our range */ |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1034 | if (extent_start >= block_group->key.objectid + |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1035 | block_group->key.offset) |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1036 | return 0; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1037 | |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1038 | extent_start = max(extent_start, start); |
| 1039 | extent_end = min(block_group->key.objectid + |
| 1040 | block_group->key.offset, extent_end + 1); |
| 1041 | len = extent_end - extent_start; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1042 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1043 | *entries += 1; |
| 1044 | ret = io_ctl_add_entry(io_ctl, extent_start, len, NULL); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1045 | if (ret) |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1046 | return -ENOSPC; |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 1047 | |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1048 | start = extent_end; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1049 | } |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1050 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1051 | return 0; |
| 1052 | } |
| 1053 | |
| 1054 | static noinline_for_stack int |
| 1055 | write_bitmap_entries(struct io_ctl *io_ctl, struct list_head *bitmap_list) |
| 1056 | { |
| 1057 | struct list_head *pos, *n; |
| 1058 | int ret; |
| 1059 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1060 | /* Write out the bitmaps */ |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1061 | list_for_each_safe(pos, n, bitmap_list) { |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1062 | struct btrfs_free_space *entry = |
| 1063 | list_entry(pos, struct btrfs_free_space, list); |
| 1064 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1065 | ret = io_ctl_add_bitmap(io_ctl, entry->bitmap); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1066 | if (ret) |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1067 | return -ENOSPC; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1068 | list_del_init(&entry->list); |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 1069 | } |
| 1070 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1071 | return 0; |
| 1072 | } |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1073 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1074 | static int flush_dirty_cache(struct inode *inode) |
| 1075 | { |
| 1076 | int ret; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 1077 | |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 1078 | ret = btrfs_wait_ordered_range(inode, 0, (u64)-1); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1079 | if (ret) |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 1080 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1, |
| 1081 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL, |
| 1082 | GFP_NOFS); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1083 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1084 | return ret; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1085 | } |
| 1086 | |
| 1087 | static void noinline_for_stack |
| 1088 | cleanup_write_cache_enospc(struct inode *inode, |
| 1089 | struct io_ctl *io_ctl, |
| 1090 | struct extent_state **cached_state, |
| 1091 | struct list_head *bitmap_list) |
| 1092 | { |
| 1093 | struct list_head *pos, *n; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1094 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1095 | list_for_each_safe(pos, n, bitmap_list) { |
| 1096 | struct btrfs_free_space *entry = |
| 1097 | list_entry(pos, struct btrfs_free_space, list); |
| 1098 | list_del_init(&entry->list); |
| 1099 | } |
| 1100 | io_ctl_drop_pages(io_ctl); |
| 1101 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, |
| 1102 | i_size_read(inode) - 1, cached_state, |
| 1103 | GFP_NOFS); |
| 1104 | } |
| 1105 | |
| 1106 | /** |
| 1107 | * __btrfs_write_out_cache - write out cached info to an inode |
| 1108 | * @root - the root the inode belongs to |
| 1109 | * @ctl - the free space cache we are going to write out |
| 1110 | * @block_group - the block_group for this cache if it belongs to a block_group |
| 1111 | * @trans - the trans handle |
| 1112 | * @path - the path to use |
| 1113 | * @offset - the offset for the key we'll insert |
| 1114 | * |
| 1115 | * This function writes out a free space cache struct to disk for quick recovery |
| 1116 | * on mount. This will return 0 if it was successfull in writing the cache out, |
| 1117 | * and -1 if it was not. |
| 1118 | */ |
| 1119 | static int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, |
| 1120 | struct btrfs_free_space_ctl *ctl, |
| 1121 | struct btrfs_block_group_cache *block_group, |
| 1122 | struct btrfs_trans_handle *trans, |
| 1123 | struct btrfs_path *path, u64 offset) |
| 1124 | { |
| 1125 | struct extent_state *cached_state = NULL; |
| 1126 | struct io_ctl io_ctl; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1127 | LIST_HEAD(bitmap_list); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1128 | int entries = 0; |
| 1129 | int bitmaps = 0; |
| 1130 | int ret; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1131 | |
| 1132 | if (!i_size_read(inode)) |
| 1133 | return -1; |
| 1134 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1135 | ret = io_ctl_init(&io_ctl, inode, root, 1); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1136 | if (ret) |
| 1137 | return -1; |
| 1138 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1139 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) { |
| 1140 | down_write(&block_group->data_rwsem); |
| 1141 | spin_lock(&block_group->lock); |
| 1142 | if (block_group->delalloc_bytes) { |
| 1143 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; |
| 1144 | spin_unlock(&block_group->lock); |
| 1145 | up_write(&block_group->data_rwsem); |
| 1146 | BTRFS_I(inode)->generation = 0; |
| 1147 | ret = 0; |
| 1148 | goto out; |
| 1149 | } |
| 1150 | spin_unlock(&block_group->lock); |
| 1151 | } |
| 1152 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1153 | /* Lock all pages first so we can lock the extent safely. */ |
| 1154 | io_ctl_prepare_pages(&io_ctl, inode, 0); |
| 1155 | |
| 1156 | lock_extent_bits(&BTRFS_I(inode)->io_tree, 0, i_size_read(inode) - 1, |
| 1157 | 0, &cached_state); |
| 1158 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1159 | io_ctl_set_generation(&io_ctl, trans->transid); |
| 1160 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1161 | mutex_lock(&ctl->cache_writeout_mutex); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1162 | /* Write out the extent entries in the free space cache */ |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1163 | ret = write_cache_extent_entries(&io_ctl, ctl, |
| 1164 | block_group, &entries, &bitmaps, |
| 1165 | &bitmap_list); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1166 | if (ret) { |
| 1167 | mutex_unlock(&ctl->cache_writeout_mutex); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1168 | goto out_nospc; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1169 | } |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1170 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1171 | /* |
| 1172 | * Some spaces that are freed in the current transaction are pinned, |
| 1173 | * they will be added into free space cache after the transaction is |
| 1174 | * committed, we shouldn't lose them. |
| 1175 | */ |
| 1176 | ret = write_pinned_extent_entries(root, block_group, &io_ctl, &entries); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1177 | if (ret) { |
| 1178 | mutex_unlock(&ctl->cache_writeout_mutex); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1179 | goto out_nospc; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1180 | } |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1181 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1182 | /* |
| 1183 | * At last, we write out all the bitmaps and keep cache_writeout_mutex |
| 1184 | * locked while doing it because a concurrent trim can be manipulating |
| 1185 | * or freeing the bitmap. |
| 1186 | */ |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1187 | ret = write_bitmap_entries(&io_ctl, &bitmap_list); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1188 | mutex_unlock(&ctl->cache_writeout_mutex); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1189 | if (ret) |
| 1190 | goto out_nospc; |
| 1191 | |
| 1192 | /* Zero out the rest of the pages just to make sure */ |
| 1193 | io_ctl_zero_remaining_pages(&io_ctl); |
| 1194 | |
| 1195 | /* Everything is written out, now we dirty the pages in the file. */ |
| 1196 | ret = btrfs_dirty_pages(root, inode, io_ctl.pages, io_ctl.num_pages, |
| 1197 | 0, i_size_read(inode), &cached_state); |
| 1198 | if (ret) |
| 1199 | goto out_nospc; |
| 1200 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1201 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) |
| 1202 | up_write(&block_group->data_rwsem); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1203 | /* |
| 1204 | * Release the pages and unlock the extent, we will flush |
| 1205 | * them out later |
| 1206 | */ |
| 1207 | io_ctl_drop_pages(&io_ctl); |
| 1208 | |
| 1209 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, |
| 1210 | i_size_read(inode) - 1, &cached_state, GFP_NOFS); |
| 1211 | |
| 1212 | /* Flush the dirty pages in the cache file. */ |
| 1213 | ret = flush_dirty_cache(inode); |
| 1214 | if (ret) |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 1215 | goto out; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1216 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1217 | /* Update the cache item to tell everyone this cache file is valid. */ |
| 1218 | ret = update_cache_item(trans, root, inode, path, offset, |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1219 | entries, bitmaps); |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 1220 | out: |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1221 | io_ctl_free(&io_ctl); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1222 | if (ret) { |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1223 | invalidate_inode_pages2(inode->i_mapping); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1224 | BTRFS_I(inode)->generation = 0; |
| 1225 | } |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1226 | btrfs_update_inode(trans, root, inode); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1227 | return ret; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1228 | |
| 1229 | out_nospc: |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1230 | cleanup_write_cache_enospc(inode, &io_ctl, &cached_state, &bitmap_list); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1231 | |
| 1232 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) |
| 1233 | up_write(&block_group->data_rwsem); |
| 1234 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1235 | goto out; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1236 | } |
| 1237 | |
| 1238 | int btrfs_write_out_cache(struct btrfs_root *root, |
| 1239 | struct btrfs_trans_handle *trans, |
| 1240 | struct btrfs_block_group_cache *block_group, |
| 1241 | struct btrfs_path *path) |
| 1242 | { |
| 1243 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
| 1244 | struct inode *inode; |
| 1245 | int ret = 0; |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 1246 | enum btrfs_disk_cache_state dcs = BTRFS_DC_WRITTEN; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1247 | |
| 1248 | root = root->fs_info->tree_root; |
| 1249 | |
| 1250 | spin_lock(&block_group->lock); |
| 1251 | if (block_group->disk_cache_state < BTRFS_DC_SETUP) { |
| 1252 | spin_unlock(&block_group->lock); |
| 1253 | return 0; |
| 1254 | } |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1255 | |
| 1256 | if (block_group->delalloc_bytes) { |
| 1257 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; |
| 1258 | spin_unlock(&block_group->lock); |
| 1259 | return 0; |
| 1260 | } |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1261 | spin_unlock(&block_group->lock); |
| 1262 | |
| 1263 | inode = lookup_free_space_inode(root, block_group, path); |
| 1264 | if (IS_ERR(inode)) |
| 1265 | return 0; |
| 1266 | |
| 1267 | ret = __btrfs_write_out_cache(root, inode, ctl, block_group, trans, |
| 1268 | path, block_group->key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1269 | if (ret) { |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 1270 | dcs = BTRFS_DC_ERROR; |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1271 | ret = 0; |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1272 | #ifdef DEBUG |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 1273 | btrfs_err(root->fs_info, |
| 1274 | "failed to write free space cache for block group %llu", |
| 1275 | block_group->key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1276 | #endif |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1277 | } |
| 1278 | |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 1279 | spin_lock(&block_group->lock); |
| 1280 | block_group->disk_cache_state = dcs; |
| 1281 | spin_unlock(&block_group->lock); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1282 | iput(inode); |
| 1283 | return ret; |
| 1284 | } |
| 1285 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1286 | static inline unsigned long offset_to_bit(u64 bitmap_start, u32 unit, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1287 | u64 offset) |
| 1288 | { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1289 | ASSERT(offset >= bitmap_start); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1290 | offset -= bitmap_start; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1291 | return (unsigned long)(div_u64(offset, unit)); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1292 | } |
| 1293 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1294 | static inline unsigned long bytes_to_bits(u64 bytes, u32 unit) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1295 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1296 | return (unsigned long)(div_u64(bytes, unit)); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1297 | } |
| 1298 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1299 | static inline u64 offset_to_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1300 | u64 offset) |
| 1301 | { |
| 1302 | u64 bitmap_start; |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1303 | u32 bytes_per_bitmap; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1304 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1305 | bytes_per_bitmap = BITS_PER_BITMAP * ctl->unit; |
| 1306 | bitmap_start = offset - ctl->start; |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1307 | bitmap_start = div_u64(bitmap_start, bytes_per_bitmap); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1308 | bitmap_start *= bytes_per_bitmap; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1309 | bitmap_start += ctl->start; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1310 | |
| 1311 | return bitmap_start; |
| 1312 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1313 | |
| 1314 | static int tree_insert_offset(struct rb_root *root, u64 offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1315 | struct rb_node *node, int bitmap) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1316 | { |
| 1317 | struct rb_node **p = &root->rb_node; |
| 1318 | struct rb_node *parent = NULL; |
| 1319 | struct btrfs_free_space *info; |
| 1320 | |
| 1321 | while (*p) { |
| 1322 | parent = *p; |
| 1323 | info = rb_entry(parent, struct btrfs_free_space, offset_index); |
| 1324 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1325 | if (offset < info->offset) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1326 | p = &(*p)->rb_left; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1327 | } else if (offset > info->offset) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1328 | p = &(*p)->rb_right; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1329 | } else { |
| 1330 | /* |
| 1331 | * we could have a bitmap entry and an extent entry |
| 1332 | * share the same offset. If this is the case, we want |
| 1333 | * the extent entry to always be found first if we do a |
| 1334 | * linear search through the tree, since we want to have |
| 1335 | * the quickest allocation time, and allocating from an |
| 1336 | * extent is faster than allocating from a bitmap. So |
| 1337 | * if we're inserting a bitmap and we find an entry at |
| 1338 | * this offset, we want to go right, or after this entry |
| 1339 | * logically. If we are inserting an extent and we've |
| 1340 | * found a bitmap, we want to go left, or before |
| 1341 | * logically. |
| 1342 | */ |
| 1343 | if (bitmap) { |
Josef Bacik | 207dde8 | 2011-05-13 14:49:23 -0400 | [diff] [blame] | 1344 | if (info->bitmap) { |
| 1345 | WARN_ON_ONCE(1); |
| 1346 | return -EEXIST; |
| 1347 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1348 | p = &(*p)->rb_right; |
| 1349 | } else { |
Josef Bacik | 207dde8 | 2011-05-13 14:49:23 -0400 | [diff] [blame] | 1350 | if (!info->bitmap) { |
| 1351 | WARN_ON_ONCE(1); |
| 1352 | return -EEXIST; |
| 1353 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1354 | p = &(*p)->rb_left; |
| 1355 | } |
| 1356 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1357 | } |
| 1358 | |
| 1359 | rb_link_node(node, parent, p); |
| 1360 | rb_insert_color(node, root); |
| 1361 | |
| 1362 | return 0; |
| 1363 | } |
| 1364 | |
| 1365 | /* |
Josef Bacik | 70cb074 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 1366 | * searches the tree for the given offset. |
| 1367 | * |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1368 | * fuzzy - If this is set, then we are trying to make an allocation, and we just |
| 1369 | * want a section that has at least bytes size and comes at or after the given |
| 1370 | * offset. |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1371 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1372 | static struct btrfs_free_space * |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1373 | tree_search_offset(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1374 | u64 offset, int bitmap_only, int fuzzy) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1375 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1376 | struct rb_node *n = ctl->free_space_offset.rb_node; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1377 | struct btrfs_free_space *entry, *prev = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1378 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1379 | /* find entry that is closest to the 'offset' */ |
| 1380 | while (1) { |
| 1381 | if (!n) { |
| 1382 | entry = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1383 | break; |
| 1384 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1385 | |
| 1386 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1387 | prev = entry; |
| 1388 | |
| 1389 | if (offset < entry->offset) |
| 1390 | n = n->rb_left; |
| 1391 | else if (offset > entry->offset) |
| 1392 | n = n->rb_right; |
| 1393 | else |
| 1394 | break; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1395 | } |
| 1396 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1397 | if (bitmap_only) { |
| 1398 | if (!entry) |
| 1399 | return NULL; |
| 1400 | if (entry->bitmap) |
| 1401 | return entry; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1402 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1403 | /* |
| 1404 | * bitmap entry and extent entry may share same offset, |
| 1405 | * in that case, bitmap entry comes after extent entry. |
| 1406 | */ |
| 1407 | n = rb_next(n); |
| 1408 | if (!n) |
| 1409 | return NULL; |
| 1410 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1411 | if (entry->offset != offset) |
| 1412 | return NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1413 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1414 | WARN_ON(!entry->bitmap); |
| 1415 | return entry; |
| 1416 | } else if (entry) { |
| 1417 | if (entry->bitmap) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1418 | /* |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1419 | * if previous extent entry covers the offset, |
| 1420 | * we should return it instead of the bitmap entry |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1421 | */ |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1422 | n = rb_prev(&entry->offset_index); |
| 1423 | if (n) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1424 | prev = rb_entry(n, struct btrfs_free_space, |
| 1425 | offset_index); |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1426 | if (!prev->bitmap && |
| 1427 | prev->offset + prev->bytes > offset) |
| 1428 | entry = prev; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1429 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1430 | } |
| 1431 | return entry; |
| 1432 | } |
| 1433 | |
| 1434 | if (!prev) |
| 1435 | return NULL; |
| 1436 | |
| 1437 | /* find last entry before the 'offset' */ |
| 1438 | entry = prev; |
| 1439 | if (entry->offset > offset) { |
| 1440 | n = rb_prev(&entry->offset_index); |
| 1441 | if (n) { |
| 1442 | entry = rb_entry(n, struct btrfs_free_space, |
| 1443 | offset_index); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1444 | ASSERT(entry->offset <= offset); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1445 | } else { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1446 | if (fuzzy) |
| 1447 | return entry; |
| 1448 | else |
| 1449 | return NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1450 | } |
| 1451 | } |
| 1452 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1453 | if (entry->bitmap) { |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1454 | n = rb_prev(&entry->offset_index); |
| 1455 | if (n) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1456 | prev = rb_entry(n, struct btrfs_free_space, |
| 1457 | offset_index); |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1458 | if (!prev->bitmap && |
| 1459 | prev->offset + prev->bytes > offset) |
| 1460 | return prev; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1461 | } |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1462 | if (entry->offset + BITS_PER_BITMAP * ctl->unit > offset) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1463 | return entry; |
| 1464 | } else if (entry->offset + entry->bytes > offset) |
| 1465 | return entry; |
| 1466 | |
| 1467 | if (!fuzzy) |
| 1468 | return NULL; |
| 1469 | |
| 1470 | while (1) { |
| 1471 | if (entry->bitmap) { |
| 1472 | if (entry->offset + BITS_PER_BITMAP * |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1473 | ctl->unit > offset) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1474 | break; |
| 1475 | } else { |
| 1476 | if (entry->offset + entry->bytes > offset) |
| 1477 | break; |
| 1478 | } |
| 1479 | |
| 1480 | n = rb_next(&entry->offset_index); |
| 1481 | if (!n) |
| 1482 | return NULL; |
| 1483 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1484 | } |
| 1485 | return entry; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1486 | } |
| 1487 | |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1488 | static inline void |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1489 | __unlink_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1490 | struct btrfs_free_space *info) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1491 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1492 | rb_erase(&info->offset_index, &ctl->free_space_offset); |
| 1493 | ctl->free_extents--; |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1494 | } |
| 1495 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1496 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1497 | struct btrfs_free_space *info) |
| 1498 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1499 | __unlink_free_space(ctl, info); |
| 1500 | ctl->free_space -= info->bytes; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1501 | } |
| 1502 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1503 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1504 | struct btrfs_free_space *info) |
| 1505 | { |
| 1506 | int ret = 0; |
| 1507 | |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1508 | ASSERT(info->bytes || info->bitmap); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1509 | ret = tree_insert_offset(&ctl->free_space_offset, info->offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1510 | &info->offset_index, (info->bitmap != NULL)); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1511 | if (ret) |
| 1512 | return ret; |
| 1513 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1514 | ctl->free_space += info->bytes; |
| 1515 | ctl->free_extents++; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1516 | return ret; |
| 1517 | } |
| 1518 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1519 | static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1520 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1521 | struct btrfs_block_group_cache *block_group = ctl->private; |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1522 | u64 max_bytes; |
| 1523 | u64 bitmap_bytes; |
| 1524 | u64 extent_bytes; |
Li Zefan | 8eb2d82 | 2010-11-09 14:48:01 +0800 | [diff] [blame] | 1525 | u64 size = block_group->key.offset; |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1526 | u32 bytes_per_bg = BITS_PER_BITMAP * ctl->unit; |
| 1527 | u32 max_bitmaps = div_u64(size + bytes_per_bg - 1, bytes_per_bg); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1528 | |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1529 | max_bitmaps = max_t(u32, max_bitmaps, 1); |
Josef Bacik | dde5740 | 2013-02-12 14:07:51 -0500 | [diff] [blame] | 1530 | |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1531 | ASSERT(ctl->total_bitmaps <= max_bitmaps); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1532 | |
| 1533 | /* |
| 1534 | * The goal is to keep the total amount of memory used per 1gb of space |
| 1535 | * at or below 32k, so we need to adjust how much memory we allow to be |
| 1536 | * used by extent based free space tracking |
| 1537 | */ |
Li Zefan | 8eb2d82 | 2010-11-09 14:48:01 +0800 | [diff] [blame] | 1538 | if (size < 1024 * 1024 * 1024) |
| 1539 | max_bytes = MAX_CACHE_BYTES_PER_GIG; |
| 1540 | else |
| 1541 | max_bytes = MAX_CACHE_BYTES_PER_GIG * |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1542 | div_u64(size, 1024 * 1024 * 1024); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1543 | |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1544 | /* |
| 1545 | * we want to account for 1 more bitmap than what we have so we can make |
| 1546 | * sure we don't go over our overall goal of MAX_CACHE_BYTES_PER_GIG as |
| 1547 | * we add more bitmaps. |
| 1548 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1549 | bitmap_bytes = (ctl->total_bitmaps + 1) * PAGE_CACHE_SIZE; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1550 | |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1551 | if (bitmap_bytes >= max_bytes) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1552 | ctl->extents_thresh = 0; |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1553 | return; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1554 | } |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1555 | |
| 1556 | /* |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1557 | * we want the extent entry threshold to always be at most 1/2 the max |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1558 | * bytes we can have, or whatever is less than that. |
| 1559 | */ |
| 1560 | extent_bytes = max_bytes - bitmap_bytes; |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1561 | extent_bytes = min_t(u64, extent_bytes, max_bytes >> 1); |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1562 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1563 | ctl->extents_thresh = |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1564 | div_u64(extent_bytes, sizeof(struct btrfs_free_space)); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1565 | } |
| 1566 | |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 1567 | static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
| 1568 | struct btrfs_free_space *info, |
| 1569 | u64 offset, u64 bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1570 | { |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1571 | unsigned long start, count; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1572 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1573 | start = offset_to_bit(info->offset, ctl->unit, offset); |
| 1574 | count = bytes_to_bits(bytes, ctl->unit); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1575 | ASSERT(start + count <= BITS_PER_BITMAP); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1576 | |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1577 | bitmap_clear(info->bitmap, start, count); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1578 | |
| 1579 | info->bytes -= bytes; |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 1580 | } |
| 1581 | |
| 1582 | static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
| 1583 | struct btrfs_free_space *info, u64 offset, |
| 1584 | u64 bytes) |
| 1585 | { |
| 1586 | __bitmap_clear_bits(ctl, info, offset, bytes); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1587 | ctl->free_space -= bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1588 | } |
| 1589 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1590 | static void bitmap_set_bits(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1591 | struct btrfs_free_space *info, u64 offset, |
| 1592 | u64 bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1593 | { |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1594 | unsigned long start, count; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1595 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1596 | start = offset_to_bit(info->offset, ctl->unit, offset); |
| 1597 | count = bytes_to_bits(bytes, ctl->unit); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1598 | ASSERT(start + count <= BITS_PER_BITMAP); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1599 | |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1600 | bitmap_set(info->bitmap, start, count); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1601 | |
| 1602 | info->bytes += bytes; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1603 | ctl->free_space += bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1604 | } |
| 1605 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1606 | /* |
| 1607 | * If we can not find suitable extent, we will use bytes to record |
| 1608 | * the size of the max extent. |
| 1609 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1610 | static int search_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1611 | struct btrfs_free_space *bitmap_info, u64 *offset, |
| 1612 | u64 *bytes) |
| 1613 | { |
| 1614 | unsigned long found_bits = 0; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1615 | unsigned long max_bits = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1616 | unsigned long bits, i; |
| 1617 | unsigned long next_zero; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1618 | unsigned long extent_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1619 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1620 | i = offset_to_bit(bitmap_info->offset, ctl->unit, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1621 | max_t(u64, *offset, bitmap_info->offset)); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1622 | bits = bytes_to_bits(*bytes, ctl->unit); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1623 | |
Wei Yongjun | ebb3dad | 2012-09-13 20:29:02 -0600 | [diff] [blame] | 1624 | for_each_set_bit_from(i, bitmap_info->bitmap, BITS_PER_BITMAP) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1625 | next_zero = find_next_zero_bit(bitmap_info->bitmap, |
| 1626 | BITS_PER_BITMAP, i); |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1627 | extent_bits = next_zero - i; |
| 1628 | if (extent_bits >= bits) { |
| 1629 | found_bits = extent_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1630 | break; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1631 | } else if (extent_bits > max_bits) { |
| 1632 | max_bits = extent_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1633 | } |
| 1634 | i = next_zero; |
| 1635 | } |
| 1636 | |
| 1637 | if (found_bits) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1638 | *offset = (u64)(i * ctl->unit) + bitmap_info->offset; |
| 1639 | *bytes = (u64)(found_bits) * ctl->unit; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1640 | return 0; |
| 1641 | } |
| 1642 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1643 | *bytes = (u64)(max_bits) * ctl->unit; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1644 | return -1; |
| 1645 | } |
| 1646 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1647 | /* Cache the size of the max extent in bytes */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1648 | static struct btrfs_free_space * |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1649 | find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1650 | unsigned long align, u64 *max_extent_size) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1651 | { |
| 1652 | struct btrfs_free_space *entry; |
| 1653 | struct rb_node *node; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1654 | u64 tmp; |
| 1655 | u64 align_off; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1656 | int ret; |
| 1657 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1658 | if (!ctl->free_space_offset.rb_node) |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1659 | goto out; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1660 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1661 | entry = tree_search_offset(ctl, offset_to_bitmap(ctl, *offset), 0, 1); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1662 | if (!entry) |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1663 | goto out; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1664 | |
| 1665 | for (node = &entry->offset_index; node; node = rb_next(node)) { |
| 1666 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1667 | if (entry->bytes < *bytes) { |
| 1668 | if (entry->bytes > *max_extent_size) |
| 1669 | *max_extent_size = entry->bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1670 | continue; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1671 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1672 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1673 | /* make sure the space returned is big enough |
| 1674 | * to match our requested alignment |
| 1675 | */ |
| 1676 | if (*bytes >= align) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1677 | tmp = entry->offset - ctl->start + align - 1; |
David Sterba | 47c5713 | 2015-02-20 18:43:47 +0100 | [diff] [blame] | 1678 | tmp = div64_u64(tmp, align); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1679 | tmp = tmp * align + ctl->start; |
| 1680 | align_off = tmp - entry->offset; |
| 1681 | } else { |
| 1682 | align_off = 0; |
| 1683 | tmp = entry->offset; |
| 1684 | } |
| 1685 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1686 | if (entry->bytes < *bytes + align_off) { |
| 1687 | if (entry->bytes > *max_extent_size) |
| 1688 | *max_extent_size = entry->bytes; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1689 | continue; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1690 | } |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1691 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1692 | if (entry->bitmap) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1693 | u64 size = *bytes; |
| 1694 | |
| 1695 | ret = search_bitmap(ctl, entry, &tmp, &size); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1696 | if (!ret) { |
| 1697 | *offset = tmp; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1698 | *bytes = size; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1699 | return entry; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1700 | } else if (size > *max_extent_size) { |
| 1701 | *max_extent_size = size; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1702 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1703 | continue; |
| 1704 | } |
| 1705 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1706 | *offset = tmp; |
| 1707 | *bytes = entry->bytes - align_off; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1708 | return entry; |
| 1709 | } |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1710 | out: |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1711 | return NULL; |
| 1712 | } |
| 1713 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1714 | static void add_new_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1715 | struct btrfs_free_space *info, u64 offset) |
| 1716 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1717 | info->offset = offset_to_bitmap(ctl, offset); |
Josef Bacik | f019f42 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1718 | info->bytes = 0; |
Alexandre Oliva | f2d0f67 | 2011-11-28 12:04:43 -0200 | [diff] [blame] | 1719 | INIT_LIST_HEAD(&info->list); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1720 | link_free_space(ctl, info); |
| 1721 | ctl->total_bitmaps++; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1722 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1723 | ctl->op->recalc_thresholds(ctl); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1724 | } |
| 1725 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1726 | static void free_bitmap(struct btrfs_free_space_ctl *ctl, |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1727 | struct btrfs_free_space *bitmap_info) |
| 1728 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1729 | unlink_free_space(ctl, bitmap_info); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1730 | kfree(bitmap_info->bitmap); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1731 | kmem_cache_free(btrfs_free_space_cachep, bitmap_info); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1732 | ctl->total_bitmaps--; |
| 1733 | ctl->op->recalc_thresholds(ctl); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1734 | } |
| 1735 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1736 | static noinline int remove_from_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1737 | struct btrfs_free_space *bitmap_info, |
| 1738 | u64 *offset, u64 *bytes) |
| 1739 | { |
| 1740 | u64 end; |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1741 | u64 search_start, search_bytes; |
| 1742 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1743 | |
| 1744 | again: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1745 | end = bitmap_info->offset + (u64)(BITS_PER_BITMAP * ctl->unit) - 1; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1746 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1747 | /* |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1748 | * We need to search for bits in this bitmap. We could only cover some |
| 1749 | * of the extent in this bitmap thanks to how we add space, so we need |
| 1750 | * to search for as much as it as we can and clear that amount, and then |
| 1751 | * go searching for the next bit. |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1752 | */ |
| 1753 | search_start = *offset; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1754 | search_bytes = ctl->unit; |
Josef Bacik | 13dbc08 | 2011-02-03 02:39:52 +0000 | [diff] [blame] | 1755 | search_bytes = min(search_bytes, end - search_start + 1); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1756 | ret = search_bitmap(ctl, bitmap_info, &search_start, &search_bytes); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 1757 | if (ret < 0 || search_start != *offset) |
| 1758 | return -EINVAL; |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1759 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1760 | /* We may have found more bits than what we need */ |
| 1761 | search_bytes = min(search_bytes, *bytes); |
| 1762 | |
| 1763 | /* Cannot clear past the end of the bitmap */ |
| 1764 | search_bytes = min(search_bytes, end - search_start + 1); |
| 1765 | |
| 1766 | bitmap_clear_bits(ctl, bitmap_info, search_start, search_bytes); |
| 1767 | *offset += search_bytes; |
| 1768 | *bytes -= search_bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1769 | |
| 1770 | if (*bytes) { |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1771 | struct rb_node *next = rb_next(&bitmap_info->offset_index); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1772 | if (!bitmap_info->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1773 | free_bitmap(ctl, bitmap_info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1774 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1775 | /* |
| 1776 | * no entry after this bitmap, but we still have bytes to |
| 1777 | * remove, so something has gone wrong. |
| 1778 | */ |
| 1779 | if (!next) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1780 | return -EINVAL; |
| 1781 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1782 | bitmap_info = rb_entry(next, struct btrfs_free_space, |
| 1783 | offset_index); |
| 1784 | |
| 1785 | /* |
| 1786 | * if the next entry isn't a bitmap we need to return to let the |
| 1787 | * extent stuff do its work. |
| 1788 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1789 | if (!bitmap_info->bitmap) |
| 1790 | return -EAGAIN; |
| 1791 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1792 | /* |
| 1793 | * Ok the next item is a bitmap, but it may not actually hold |
| 1794 | * the information for the rest of this free space stuff, so |
| 1795 | * look for it, and if we don't find it return so we can try |
| 1796 | * everything over again. |
| 1797 | */ |
| 1798 | search_start = *offset; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1799 | search_bytes = ctl->unit; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1800 | ret = search_bitmap(ctl, bitmap_info, &search_start, |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1801 | &search_bytes); |
| 1802 | if (ret < 0 || search_start != *offset) |
| 1803 | return -EAGAIN; |
| 1804 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1805 | goto again; |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1806 | } else if (!bitmap_info->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1807 | free_bitmap(ctl, bitmap_info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1808 | |
| 1809 | return 0; |
| 1810 | } |
| 1811 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1812 | static u64 add_bytes_to_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1813 | struct btrfs_free_space *info, u64 offset, |
| 1814 | u64 bytes) |
| 1815 | { |
| 1816 | u64 bytes_to_set = 0; |
| 1817 | u64 end; |
| 1818 | |
| 1819 | end = info->offset + (u64)(BITS_PER_BITMAP * ctl->unit); |
| 1820 | |
| 1821 | bytes_to_set = min(end - offset, bytes); |
| 1822 | |
| 1823 | bitmap_set_bits(ctl, info, offset, bytes_to_set); |
| 1824 | |
| 1825 | return bytes_to_set; |
| 1826 | |
| 1827 | } |
| 1828 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1829 | static bool use_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1830 | struct btrfs_free_space *info) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1831 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1832 | struct btrfs_block_group_cache *block_group = ctl->private; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1833 | |
| 1834 | /* |
| 1835 | * If we are below the extents threshold then we can add this as an |
| 1836 | * extent, and don't have to deal with the bitmap |
| 1837 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1838 | if (ctl->free_extents < ctl->extents_thresh) { |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1839 | /* |
| 1840 | * If this block group has some small extents we don't want to |
| 1841 | * use up all of our free slots in the cache with them, we want |
| 1842 | * to reserve them to larger extents, however if we have plent |
| 1843 | * of cache left then go ahead an dadd them, no sense in adding |
| 1844 | * the overhead of a bitmap if we don't have to. |
| 1845 | */ |
| 1846 | if (info->bytes <= block_group->sectorsize * 4) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1847 | if (ctl->free_extents * 2 <= ctl->extents_thresh) |
| 1848 | return false; |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1849 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1850 | return false; |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1851 | } |
| 1852 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1853 | |
| 1854 | /* |
Josef Bacik | dde5740 | 2013-02-12 14:07:51 -0500 | [diff] [blame] | 1855 | * The original block groups from mkfs can be really small, like 8 |
| 1856 | * megabytes, so don't bother with a bitmap for those entries. However |
| 1857 | * some block groups can be smaller than what a bitmap would cover but |
| 1858 | * are still large enough that they could overflow the 32k memory limit, |
| 1859 | * so allow those block groups to still be allowed to have a bitmap |
| 1860 | * entry. |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1861 | */ |
Josef Bacik | dde5740 | 2013-02-12 14:07:51 -0500 | [diff] [blame] | 1862 | if (((BITS_PER_BITMAP * ctl->unit) >> 1) > block_group->key.offset) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1863 | return false; |
| 1864 | |
| 1865 | return true; |
| 1866 | } |
| 1867 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1868 | static struct btrfs_free_space_op free_space_op = { |
| 1869 | .recalc_thresholds = recalculate_thresholds, |
| 1870 | .use_bitmap = use_bitmap, |
| 1871 | }; |
| 1872 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1873 | static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1874 | struct btrfs_free_space *info) |
| 1875 | { |
| 1876 | struct btrfs_free_space *bitmap_info; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1877 | struct btrfs_block_group_cache *block_group = NULL; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1878 | int added = 0; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1879 | u64 bytes, offset, bytes_added; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1880 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1881 | |
| 1882 | bytes = info->bytes; |
| 1883 | offset = info->offset; |
| 1884 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1885 | if (!ctl->op->use_bitmap(ctl, info)) |
| 1886 | return 0; |
| 1887 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1888 | if (ctl->op == &free_space_op) |
| 1889 | block_group = ctl->private; |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1890 | again: |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1891 | /* |
| 1892 | * Since we link bitmaps right into the cluster we need to see if we |
| 1893 | * have a cluster here, and if so and it has our bitmap we need to add |
| 1894 | * the free space to that bitmap. |
| 1895 | */ |
| 1896 | if (block_group && !list_empty(&block_group->cluster_list)) { |
| 1897 | struct btrfs_free_cluster *cluster; |
| 1898 | struct rb_node *node; |
| 1899 | struct btrfs_free_space *entry; |
| 1900 | |
| 1901 | cluster = list_entry(block_group->cluster_list.next, |
| 1902 | struct btrfs_free_cluster, |
| 1903 | block_group_list); |
| 1904 | spin_lock(&cluster->lock); |
| 1905 | node = rb_first(&cluster->root); |
| 1906 | if (!node) { |
| 1907 | spin_unlock(&cluster->lock); |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1908 | goto no_cluster_bitmap; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1909 | } |
| 1910 | |
| 1911 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 1912 | if (!entry->bitmap) { |
| 1913 | spin_unlock(&cluster->lock); |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1914 | goto no_cluster_bitmap; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1915 | } |
| 1916 | |
| 1917 | if (entry->offset == offset_to_bitmap(ctl, offset)) { |
| 1918 | bytes_added = add_bytes_to_bitmap(ctl, entry, |
| 1919 | offset, bytes); |
| 1920 | bytes -= bytes_added; |
| 1921 | offset += bytes_added; |
| 1922 | } |
| 1923 | spin_unlock(&cluster->lock); |
| 1924 | if (!bytes) { |
| 1925 | ret = 1; |
| 1926 | goto out; |
| 1927 | } |
| 1928 | } |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1929 | |
| 1930 | no_cluster_bitmap: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1931 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1932 | 1, 0); |
| 1933 | if (!bitmap_info) { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1934 | ASSERT(added == 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1935 | goto new_bitmap; |
| 1936 | } |
| 1937 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1938 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
| 1939 | bytes -= bytes_added; |
| 1940 | offset += bytes_added; |
| 1941 | added = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1942 | |
| 1943 | if (!bytes) { |
| 1944 | ret = 1; |
| 1945 | goto out; |
| 1946 | } else |
| 1947 | goto again; |
| 1948 | |
| 1949 | new_bitmap: |
| 1950 | if (info && info->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1951 | add_new_bitmap(ctl, info, offset); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1952 | added = 1; |
| 1953 | info = NULL; |
| 1954 | goto again; |
| 1955 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1956 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1957 | |
| 1958 | /* no pre-allocated info, allocate a new one */ |
| 1959 | if (!info) { |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1960 | info = kmem_cache_zalloc(btrfs_free_space_cachep, |
| 1961 | GFP_NOFS); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1962 | if (!info) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1963 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1964 | ret = -ENOMEM; |
| 1965 | goto out; |
| 1966 | } |
| 1967 | } |
| 1968 | |
| 1969 | /* allocate the bitmap */ |
| 1970 | info->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1971 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1972 | if (!info->bitmap) { |
| 1973 | ret = -ENOMEM; |
| 1974 | goto out; |
| 1975 | } |
| 1976 | goto again; |
| 1977 | } |
| 1978 | |
| 1979 | out: |
| 1980 | if (info) { |
| 1981 | if (info->bitmap) |
| 1982 | kfree(info->bitmap); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1983 | kmem_cache_free(btrfs_free_space_cachep, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1984 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1985 | |
| 1986 | return ret; |
| 1987 | } |
| 1988 | |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 1989 | static bool try_merge_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1990 | struct btrfs_free_space *info, bool update_stat) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1991 | { |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 1992 | struct btrfs_free_space *left_info; |
| 1993 | struct btrfs_free_space *right_info; |
| 1994 | bool merged = false; |
| 1995 | u64 offset = info->offset; |
| 1996 | u64 bytes = info->bytes; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 1997 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1998 | /* |
| 1999 | * first we want to see if there is free space adjacent to the range we |
| 2000 | * are adding, if there is remove that struct and add a new one to |
| 2001 | * cover the entire range |
| 2002 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2003 | right_info = tree_search_offset(ctl, offset + bytes, 0, 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2004 | if (right_info && rb_prev(&right_info->offset_index)) |
| 2005 | left_info = rb_entry(rb_prev(&right_info->offset_index), |
| 2006 | struct btrfs_free_space, offset_index); |
| 2007 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2008 | left_info = tree_search_offset(ctl, offset - 1, 0, 0); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2009 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2010 | if (right_info && !right_info->bitmap) { |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2011 | if (update_stat) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2012 | unlink_free_space(ctl, right_info); |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2013 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2014 | __unlink_free_space(ctl, right_info); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2015 | info->bytes += right_info->bytes; |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2016 | kmem_cache_free(btrfs_free_space_cachep, right_info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2017 | merged = true; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2018 | } |
| 2019 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2020 | if (left_info && !left_info->bitmap && |
| 2021 | left_info->offset + left_info->bytes == offset) { |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2022 | if (update_stat) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2023 | unlink_free_space(ctl, left_info); |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2024 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2025 | __unlink_free_space(ctl, left_info); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2026 | info->offset = left_info->offset; |
| 2027 | info->bytes += left_info->bytes; |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2028 | kmem_cache_free(btrfs_free_space_cachep, left_info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2029 | merged = true; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2030 | } |
| 2031 | |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2032 | return merged; |
| 2033 | } |
| 2034 | |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2035 | static bool steal_from_bitmap_to_end(struct btrfs_free_space_ctl *ctl, |
| 2036 | struct btrfs_free_space *info, |
| 2037 | bool update_stat) |
| 2038 | { |
| 2039 | struct btrfs_free_space *bitmap; |
| 2040 | unsigned long i; |
| 2041 | unsigned long j; |
| 2042 | const u64 end = info->offset + info->bytes; |
| 2043 | const u64 bitmap_offset = offset_to_bitmap(ctl, end); |
| 2044 | u64 bytes; |
| 2045 | |
| 2046 | bitmap = tree_search_offset(ctl, bitmap_offset, 1, 0); |
| 2047 | if (!bitmap) |
| 2048 | return false; |
| 2049 | |
| 2050 | i = offset_to_bit(bitmap->offset, ctl->unit, end); |
| 2051 | j = find_next_zero_bit(bitmap->bitmap, BITS_PER_BITMAP, i); |
| 2052 | if (j == i) |
| 2053 | return false; |
| 2054 | bytes = (j - i) * ctl->unit; |
| 2055 | info->bytes += bytes; |
| 2056 | |
| 2057 | if (update_stat) |
| 2058 | bitmap_clear_bits(ctl, bitmap, end, bytes); |
| 2059 | else |
| 2060 | __bitmap_clear_bits(ctl, bitmap, end, bytes); |
| 2061 | |
| 2062 | if (!bitmap->bytes) |
| 2063 | free_bitmap(ctl, bitmap); |
| 2064 | |
| 2065 | return true; |
| 2066 | } |
| 2067 | |
| 2068 | static bool steal_from_bitmap_to_front(struct btrfs_free_space_ctl *ctl, |
| 2069 | struct btrfs_free_space *info, |
| 2070 | bool update_stat) |
| 2071 | { |
| 2072 | struct btrfs_free_space *bitmap; |
| 2073 | u64 bitmap_offset; |
| 2074 | unsigned long i; |
| 2075 | unsigned long j; |
| 2076 | unsigned long prev_j; |
| 2077 | u64 bytes; |
| 2078 | |
| 2079 | bitmap_offset = offset_to_bitmap(ctl, info->offset); |
| 2080 | /* If we're on a boundary, try the previous logical bitmap. */ |
| 2081 | if (bitmap_offset == info->offset) { |
| 2082 | if (info->offset == 0) |
| 2083 | return false; |
| 2084 | bitmap_offset = offset_to_bitmap(ctl, info->offset - 1); |
| 2085 | } |
| 2086 | |
| 2087 | bitmap = tree_search_offset(ctl, bitmap_offset, 1, 0); |
| 2088 | if (!bitmap) |
| 2089 | return false; |
| 2090 | |
| 2091 | i = offset_to_bit(bitmap->offset, ctl->unit, info->offset) - 1; |
| 2092 | j = 0; |
| 2093 | prev_j = (unsigned long)-1; |
| 2094 | for_each_clear_bit_from(j, bitmap->bitmap, BITS_PER_BITMAP) { |
| 2095 | if (j > i) |
| 2096 | break; |
| 2097 | prev_j = j; |
| 2098 | } |
| 2099 | if (prev_j == i) |
| 2100 | return false; |
| 2101 | |
| 2102 | if (prev_j == (unsigned long)-1) |
| 2103 | bytes = (i + 1) * ctl->unit; |
| 2104 | else |
| 2105 | bytes = (i - prev_j) * ctl->unit; |
| 2106 | |
| 2107 | info->offset -= bytes; |
| 2108 | info->bytes += bytes; |
| 2109 | |
| 2110 | if (update_stat) |
| 2111 | bitmap_clear_bits(ctl, bitmap, info->offset, bytes); |
| 2112 | else |
| 2113 | __bitmap_clear_bits(ctl, bitmap, info->offset, bytes); |
| 2114 | |
| 2115 | if (!bitmap->bytes) |
| 2116 | free_bitmap(ctl, bitmap); |
| 2117 | |
| 2118 | return true; |
| 2119 | } |
| 2120 | |
| 2121 | /* |
| 2122 | * We prefer always to allocate from extent entries, both for clustered and |
| 2123 | * non-clustered allocation requests. So when attempting to add a new extent |
| 2124 | * entry, try to see if there's adjacent free space in bitmap entries, and if |
| 2125 | * there is, migrate that space from the bitmaps to the extent. |
| 2126 | * Like this we get better chances of satisfying space allocation requests |
| 2127 | * because we attempt to satisfy them based on a single cache entry, and never |
| 2128 | * on 2 or more entries - even if the entries represent a contiguous free space |
| 2129 | * region (e.g. 1 extent entry + 1 bitmap entry starting where the extent entry |
| 2130 | * ends). |
| 2131 | */ |
| 2132 | static void steal_from_bitmap(struct btrfs_free_space_ctl *ctl, |
| 2133 | struct btrfs_free_space *info, |
| 2134 | bool update_stat) |
| 2135 | { |
| 2136 | /* |
| 2137 | * Only work with disconnected entries, as we can change their offset, |
| 2138 | * and must be extent entries. |
| 2139 | */ |
| 2140 | ASSERT(!info->bitmap); |
| 2141 | ASSERT(RB_EMPTY_NODE(&info->offset_index)); |
| 2142 | |
| 2143 | if (ctl->total_bitmaps > 0) { |
| 2144 | bool stole_end; |
| 2145 | bool stole_front = false; |
| 2146 | |
| 2147 | stole_end = steal_from_bitmap_to_end(ctl, info, update_stat); |
| 2148 | if (ctl->total_bitmaps > 0) |
| 2149 | stole_front = steal_from_bitmap_to_front(ctl, info, |
| 2150 | update_stat); |
| 2151 | |
| 2152 | if (stole_end || stole_front) |
| 2153 | try_merge_free_space(ctl, info, update_stat); |
| 2154 | } |
| 2155 | } |
| 2156 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2157 | int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl, |
| 2158 | u64 offset, u64 bytes) |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2159 | { |
| 2160 | struct btrfs_free_space *info; |
| 2161 | int ret = 0; |
| 2162 | |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2163 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2164 | if (!info) |
| 2165 | return -ENOMEM; |
| 2166 | |
| 2167 | info->offset = offset; |
| 2168 | info->bytes = bytes; |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2169 | RB_CLEAR_NODE(&info->offset_index); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2170 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2171 | spin_lock(&ctl->tree_lock); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2172 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2173 | if (try_merge_free_space(ctl, info, true)) |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2174 | goto link; |
| 2175 | |
| 2176 | /* |
| 2177 | * There was no extent directly to the left or right of this new |
| 2178 | * extent then we know we're going to have to allocate a new extent, so |
| 2179 | * before we do that see if we need to drop this into a bitmap |
| 2180 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2181 | ret = insert_into_bitmap(ctl, info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2182 | if (ret < 0) { |
| 2183 | goto out; |
| 2184 | } else if (ret) { |
| 2185 | ret = 0; |
| 2186 | goto out; |
| 2187 | } |
| 2188 | link: |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2189 | /* |
| 2190 | * Only steal free space from adjacent bitmaps if we're sure we're not |
| 2191 | * going to add the new free space to existing bitmap entries - because |
| 2192 | * that would mean unnecessary work that would be reverted. Therefore |
| 2193 | * attempt to steal space from bitmaps if we're adding an extent entry. |
| 2194 | */ |
| 2195 | steal_from_bitmap(ctl, info, true); |
| 2196 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2197 | ret = link_free_space(ctl, info); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2198 | if (ret) |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2199 | kmem_cache_free(btrfs_free_space_cachep, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2200 | out: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2201 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2202 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2203 | if (ret) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2204 | printk(KERN_CRIT "BTRFS: unable to add free space :%d\n", ret); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 2205 | ASSERT(ret != -EEXIST); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2206 | } |
| 2207 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2208 | return ret; |
| 2209 | } |
| 2210 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2211 | int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, |
| 2212 | u64 offset, u64 bytes) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2213 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2214 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2215 | struct btrfs_free_space *info; |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2216 | int ret; |
| 2217 | bool re_search = false; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2218 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2219 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2220 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2221 | again: |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2222 | ret = 0; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2223 | if (!bytes) |
| 2224 | goto out_lock; |
| 2225 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2226 | info = tree_search_offset(ctl, offset, 0, 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2227 | if (!info) { |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 2228 | /* |
| 2229 | * oops didn't find an extent that matched the space we wanted |
| 2230 | * to remove, look for a bitmap instead |
| 2231 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2232 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 2233 | 1, 0); |
| 2234 | if (!info) { |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2235 | /* |
| 2236 | * If we found a partial bit of our free space in a |
| 2237 | * bitmap but then couldn't find the other part this may |
| 2238 | * be a problem, so WARN about it. |
Chris Mason | 24a7031 | 2011-11-21 09:39:11 -0500 | [diff] [blame] | 2239 | */ |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2240 | WARN_ON(re_search); |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 2241 | goto out_lock; |
| 2242 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2243 | } |
| 2244 | |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2245 | re_search = false; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2246 | if (!info->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2247 | unlink_free_space(ctl, info); |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2248 | if (offset == info->offset) { |
| 2249 | u64 to_free = min(bytes, info->bytes); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2250 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2251 | info->bytes -= to_free; |
| 2252 | info->offset += to_free; |
| 2253 | if (info->bytes) { |
| 2254 | ret = link_free_space(ctl, info); |
| 2255 | WARN_ON(ret); |
| 2256 | } else { |
| 2257 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 2258 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2259 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2260 | offset += to_free; |
| 2261 | bytes -= to_free; |
| 2262 | goto again; |
| 2263 | } else { |
| 2264 | u64 old_end = info->bytes + info->offset; |
Chris Mason | 9b49c9b | 2008-09-24 11:23:25 -0400 | [diff] [blame] | 2265 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2266 | info->bytes = offset - info->offset; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2267 | ret = link_free_space(ctl, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2268 | WARN_ON(ret); |
| 2269 | if (ret) |
| 2270 | goto out_lock; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2271 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2272 | /* Not enough bytes in this entry to satisfy us */ |
| 2273 | if (old_end < offset + bytes) { |
| 2274 | bytes -= old_end - offset; |
| 2275 | offset = old_end; |
| 2276 | goto again; |
| 2277 | } else if (old_end == offset + bytes) { |
| 2278 | /* all done */ |
| 2279 | goto out_lock; |
| 2280 | } |
| 2281 | spin_unlock(&ctl->tree_lock); |
| 2282 | |
| 2283 | ret = btrfs_add_free_space(block_group, offset + bytes, |
| 2284 | old_end - (offset + bytes)); |
| 2285 | WARN_ON(ret); |
| 2286 | goto out; |
| 2287 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2288 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2289 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2290 | ret = remove_from_bitmap(ctl, info, &offset, &bytes); |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2291 | if (ret == -EAGAIN) { |
| 2292 | re_search = true; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2293 | goto again; |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2294 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2295 | out_lock: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2296 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2297 | out: |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2298 | return ret; |
| 2299 | } |
| 2300 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2301 | void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, |
| 2302 | u64 bytes) |
| 2303 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2304 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2305 | struct btrfs_free_space *info; |
| 2306 | struct rb_node *n; |
| 2307 | int count = 0; |
| 2308 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2309 | for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2310 | info = rb_entry(n, struct btrfs_free_space, offset_index); |
Liu Bo | f6175ef | 2012-07-06 03:31:36 -0600 | [diff] [blame] | 2311 | if (info->bytes >= bytes && !block_group->ro) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2312 | count++; |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2313 | btrfs_crit(block_group->fs_info, |
| 2314 | "entry offset %llu, bytes %llu, bitmap %s", |
| 2315 | info->offset, info->bytes, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2316 | (info->bitmap) ? "yes" : "no"); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2317 | } |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2318 | btrfs_info(block_group->fs_info, "block group has cluster?: %s", |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2319 | list_empty(&block_group->cluster_list) ? "no" : "yes"); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2320 | btrfs_info(block_group->fs_info, |
| 2321 | "%d blocks of free space at or bigger than bytes is", count); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2322 | } |
| 2323 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2324 | void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2325 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2326 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2327 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2328 | spin_lock_init(&ctl->tree_lock); |
| 2329 | ctl->unit = block_group->sectorsize; |
| 2330 | ctl->start = block_group->key.objectid; |
| 2331 | ctl->private = block_group; |
| 2332 | ctl->op = &free_space_op; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 2333 | INIT_LIST_HEAD(&ctl->trimming_ranges); |
| 2334 | mutex_init(&ctl->cache_writeout_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2335 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2336 | /* |
| 2337 | * we only want to have 32k of ram per block group for keeping |
| 2338 | * track of free space, and if we pass 1/2 of that we want to |
| 2339 | * start converting things over to using bitmaps |
| 2340 | */ |
| 2341 | ctl->extents_thresh = ((1024 * 32) / 2) / |
| 2342 | sizeof(struct btrfs_free_space); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2343 | } |
| 2344 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2345 | /* |
| 2346 | * for a given cluster, put all of its extents back into the free |
| 2347 | * space cache. If the block group passed doesn't match the block group |
| 2348 | * pointed to by the cluster, someone else raced in and freed the |
| 2349 | * cluster already. In that case, we just return without changing anything |
| 2350 | */ |
| 2351 | static int |
| 2352 | __btrfs_return_cluster_to_free_space( |
| 2353 | struct btrfs_block_group_cache *block_group, |
| 2354 | struct btrfs_free_cluster *cluster) |
| 2355 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2356 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2357 | struct btrfs_free_space *entry; |
| 2358 | struct rb_node *node; |
| 2359 | |
| 2360 | spin_lock(&cluster->lock); |
| 2361 | if (cluster->block_group != block_group) |
| 2362 | goto out; |
| 2363 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2364 | cluster->block_group = NULL; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2365 | cluster->window_start = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2366 | list_del_init(&cluster->block_group_list); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2367 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2368 | node = rb_first(&cluster->root); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2369 | while (node) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2370 | bool bitmap; |
| 2371 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2372 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2373 | node = rb_next(&entry->offset_index); |
| 2374 | rb_erase(&entry->offset_index, &cluster->root); |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2375 | RB_CLEAR_NODE(&entry->offset_index); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2376 | |
| 2377 | bitmap = (entry->bitmap != NULL); |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2378 | if (!bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2379 | try_merge_free_space(ctl, entry, false); |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2380 | steal_from_bitmap(ctl, entry, false); |
| 2381 | } |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2382 | tree_insert_offset(&ctl->free_space_offset, |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2383 | entry->offset, &entry->offset_index, bitmap); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2384 | } |
Eric Paris | 6bef4d3 | 2010-02-23 19:43:04 +0000 | [diff] [blame] | 2385 | cluster->root = RB_ROOT; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2386 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2387 | out: |
| 2388 | spin_unlock(&cluster->lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2389 | btrfs_put_block_group(block_group); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2390 | return 0; |
| 2391 | } |
| 2392 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 2393 | static void __btrfs_remove_free_space_cache_locked( |
| 2394 | struct btrfs_free_space_ctl *ctl) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2395 | { |
| 2396 | struct btrfs_free_space *info; |
| 2397 | struct rb_node *node; |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2398 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2399 | while ((node = rb_last(&ctl->free_space_offset)) != NULL) { |
| 2400 | info = rb_entry(node, struct btrfs_free_space, offset_index); |
Josef Bacik | 9b90f51 | 2011-06-24 16:02:51 +0000 | [diff] [blame] | 2401 | if (!info->bitmap) { |
| 2402 | unlink_free_space(ctl, info); |
| 2403 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 2404 | } else { |
| 2405 | free_bitmap(ctl, info); |
| 2406 | } |
David Sterba | 351810c | 2015-01-08 15:20:54 +0100 | [diff] [blame] | 2407 | |
| 2408 | cond_resched_lock(&ctl->tree_lock); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2409 | } |
Chris Mason | 0965537 | 2011-05-21 09:27:38 -0400 | [diff] [blame] | 2410 | } |
| 2411 | |
| 2412 | void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl) |
| 2413 | { |
| 2414 | spin_lock(&ctl->tree_lock); |
| 2415 | __btrfs_remove_free_space_cache_locked(ctl); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2416 | spin_unlock(&ctl->tree_lock); |
| 2417 | } |
| 2418 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2419 | void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group) |
| 2420 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2421 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2422 | struct btrfs_free_cluster *cluster; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2423 | struct list_head *head; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2424 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2425 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2426 | while ((head = block_group->cluster_list.next) != |
| 2427 | &block_group->cluster_list) { |
| 2428 | cluster = list_entry(head, struct btrfs_free_cluster, |
| 2429 | block_group_list); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2430 | |
| 2431 | WARN_ON(cluster->block_group != block_group); |
| 2432 | __btrfs_return_cluster_to_free_space(block_group, cluster); |
David Sterba | 351810c | 2015-01-08 15:20:54 +0100 | [diff] [blame] | 2433 | |
| 2434 | cond_resched_lock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2435 | } |
Chris Mason | 0965537 | 2011-05-21 09:27:38 -0400 | [diff] [blame] | 2436 | __btrfs_remove_free_space_cache_locked(ctl); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2437 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2438 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2439 | } |
| 2440 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2441 | u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2442 | u64 offset, u64 bytes, u64 empty_size, |
| 2443 | u64 *max_extent_size) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2444 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2445 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2446 | struct btrfs_free_space *entry = NULL; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2447 | u64 bytes_search = bytes + empty_size; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2448 | u64 ret = 0; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2449 | u64 align_gap = 0; |
| 2450 | u64 align_gap_len = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2451 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2452 | spin_lock(&ctl->tree_lock); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2453 | entry = find_free_space(ctl, &offset, &bytes_search, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2454 | block_group->full_stripe_len, max_extent_size); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2455 | if (!entry) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2456 | goto out; |
| 2457 | |
| 2458 | ret = offset; |
| 2459 | if (entry->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2460 | bitmap_clear_bits(ctl, entry, offset, bytes); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 2461 | if (!entry->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2462 | free_bitmap(ctl, entry); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2463 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2464 | unlink_free_space(ctl, entry); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2465 | align_gap_len = offset - entry->offset; |
| 2466 | align_gap = entry->offset; |
| 2467 | |
| 2468 | entry->offset = offset + bytes; |
| 2469 | WARN_ON(entry->bytes < bytes + align_gap_len); |
| 2470 | |
| 2471 | entry->bytes -= bytes + align_gap_len; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2472 | if (!entry->bytes) |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2473 | kmem_cache_free(btrfs_free_space_cachep, entry); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2474 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2475 | link_free_space(ctl, entry); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2476 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2477 | out: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2478 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2479 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2480 | if (align_gap_len) |
| 2481 | __btrfs_add_free_space(ctl, align_gap, align_gap_len); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2482 | return ret; |
| 2483 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2484 | |
| 2485 | /* |
| 2486 | * given a cluster, put all of its extents back into the free space |
| 2487 | * cache. If a block group is passed, this function will only free |
| 2488 | * a cluster that belongs to the passed block group. |
| 2489 | * |
| 2490 | * Otherwise, it'll get a reference on the block group pointed to by the |
| 2491 | * cluster and remove the cluster from it. |
| 2492 | */ |
| 2493 | int btrfs_return_cluster_to_free_space( |
| 2494 | struct btrfs_block_group_cache *block_group, |
| 2495 | struct btrfs_free_cluster *cluster) |
| 2496 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2497 | struct btrfs_free_space_ctl *ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2498 | int ret; |
| 2499 | |
| 2500 | /* first, get a safe pointer to the block group */ |
| 2501 | spin_lock(&cluster->lock); |
| 2502 | if (!block_group) { |
| 2503 | block_group = cluster->block_group; |
| 2504 | if (!block_group) { |
| 2505 | spin_unlock(&cluster->lock); |
| 2506 | return 0; |
| 2507 | } |
| 2508 | } else if (cluster->block_group != block_group) { |
| 2509 | /* someone else has already freed it don't redo their work */ |
| 2510 | spin_unlock(&cluster->lock); |
| 2511 | return 0; |
| 2512 | } |
| 2513 | atomic_inc(&block_group->count); |
| 2514 | spin_unlock(&cluster->lock); |
| 2515 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2516 | ctl = block_group->free_space_ctl; |
| 2517 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2518 | /* now return any extents the cluster had on it */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2519 | spin_lock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2520 | ret = __btrfs_return_cluster_to_free_space(block_group, cluster); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2521 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2522 | |
| 2523 | /* finally drop our ref */ |
| 2524 | btrfs_put_block_group(block_group); |
| 2525 | return ret; |
| 2526 | } |
| 2527 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2528 | static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, |
| 2529 | struct btrfs_free_cluster *cluster, |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2530 | struct btrfs_free_space *entry, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2531 | u64 bytes, u64 min_start, |
| 2532 | u64 *max_extent_size) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2533 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2534 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2535 | int err; |
| 2536 | u64 search_start = cluster->window_start; |
| 2537 | u64 search_bytes = bytes; |
| 2538 | u64 ret = 0; |
| 2539 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2540 | search_start = min_start; |
| 2541 | search_bytes = bytes; |
| 2542 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2543 | err = search_bitmap(ctl, entry, &search_start, &search_bytes); |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2544 | if (err) { |
| 2545 | if (search_bytes > *max_extent_size) |
| 2546 | *max_extent_size = search_bytes; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2547 | return 0; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2548 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2549 | |
| 2550 | ret = search_start; |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 2551 | __bitmap_clear_bits(ctl, entry, ret, bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2552 | |
| 2553 | return ret; |
| 2554 | } |
| 2555 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2556 | /* |
| 2557 | * given a cluster, try to allocate 'bytes' from it, returns 0 |
| 2558 | * if it couldn't find anything suitably large, or a logical disk offset |
| 2559 | * if things worked out |
| 2560 | */ |
| 2561 | u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, |
| 2562 | struct btrfs_free_cluster *cluster, u64 bytes, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2563 | u64 min_start, u64 *max_extent_size) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2564 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2565 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2566 | struct btrfs_free_space *entry = NULL; |
| 2567 | struct rb_node *node; |
| 2568 | u64 ret = 0; |
| 2569 | |
| 2570 | spin_lock(&cluster->lock); |
| 2571 | if (bytes > cluster->max_size) |
| 2572 | goto out; |
| 2573 | |
| 2574 | if (cluster->block_group != block_group) |
| 2575 | goto out; |
| 2576 | |
| 2577 | node = rb_first(&cluster->root); |
| 2578 | if (!node) |
| 2579 | goto out; |
| 2580 | |
| 2581 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2582 | while (1) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2583 | if (entry->bytes < bytes && entry->bytes > *max_extent_size) |
| 2584 | *max_extent_size = entry->bytes; |
| 2585 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2586 | if (entry->bytes < bytes || |
| 2587 | (!entry->bitmap && entry->offset < min_start)) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2588 | node = rb_next(&entry->offset_index); |
| 2589 | if (!node) |
| 2590 | break; |
| 2591 | entry = rb_entry(node, struct btrfs_free_space, |
| 2592 | offset_index); |
| 2593 | continue; |
| 2594 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2595 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2596 | if (entry->bitmap) { |
| 2597 | ret = btrfs_alloc_from_bitmap(block_group, |
| 2598 | cluster, entry, bytes, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2599 | cluster->window_start, |
| 2600 | max_extent_size); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2601 | if (ret == 0) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2602 | node = rb_next(&entry->offset_index); |
| 2603 | if (!node) |
| 2604 | break; |
| 2605 | entry = rb_entry(node, struct btrfs_free_space, |
| 2606 | offset_index); |
| 2607 | continue; |
| 2608 | } |
Josef Bacik | 9b23062 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 2609 | cluster->window_start += bytes; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2610 | } else { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2611 | ret = entry->offset; |
| 2612 | |
| 2613 | entry->offset += bytes; |
| 2614 | entry->bytes -= bytes; |
| 2615 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2616 | |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2617 | if (entry->bytes == 0) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2618 | rb_erase(&entry->offset_index, &cluster->root); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2619 | break; |
| 2620 | } |
| 2621 | out: |
| 2622 | spin_unlock(&cluster->lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2623 | |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2624 | if (!ret) |
| 2625 | return 0; |
| 2626 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2627 | spin_lock(&ctl->tree_lock); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2628 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2629 | ctl->free_space -= bytes; |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2630 | if (entry->bytes == 0) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2631 | ctl->free_extents--; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2632 | if (entry->bitmap) { |
| 2633 | kfree(entry->bitmap); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2634 | ctl->total_bitmaps--; |
| 2635 | ctl->op->recalc_thresholds(ctl); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2636 | } |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2637 | kmem_cache_free(btrfs_free_space_cachep, entry); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2638 | } |
| 2639 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2640 | spin_unlock(&ctl->tree_lock); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2641 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2642 | return ret; |
| 2643 | } |
| 2644 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2645 | static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group, |
| 2646 | struct btrfs_free_space *entry, |
| 2647 | struct btrfs_free_cluster *cluster, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2648 | u64 offset, u64 bytes, |
| 2649 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2650 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2651 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2652 | unsigned long next_zero; |
| 2653 | unsigned long i; |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2654 | unsigned long want_bits; |
| 2655 | unsigned long min_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2656 | unsigned long found_bits; |
| 2657 | unsigned long start = 0; |
| 2658 | unsigned long total_found = 0; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2659 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2660 | |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2661 | i = offset_to_bit(entry->offset, ctl->unit, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2662 | max_t(u64, offset, entry->offset)); |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2663 | want_bits = bytes_to_bits(bytes, ctl->unit); |
| 2664 | min_bits = bytes_to_bits(min_bytes, ctl->unit); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2665 | |
| 2666 | again: |
| 2667 | found_bits = 0; |
Wei Yongjun | ebb3dad | 2012-09-13 20:29:02 -0600 | [diff] [blame] | 2668 | for_each_set_bit_from(i, entry->bitmap, BITS_PER_BITMAP) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2669 | next_zero = find_next_zero_bit(entry->bitmap, |
| 2670 | BITS_PER_BITMAP, i); |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2671 | if (next_zero - i >= min_bits) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2672 | found_bits = next_zero - i; |
| 2673 | break; |
| 2674 | } |
| 2675 | i = next_zero; |
| 2676 | } |
| 2677 | |
| 2678 | if (!found_bits) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2679 | return -ENOSPC; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2680 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2681 | if (!total_found) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2682 | start = i; |
Alexandre Oliva | b78d09b | 2011-11-30 13:43:00 -0500 | [diff] [blame] | 2683 | cluster->max_size = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2684 | } |
| 2685 | |
| 2686 | total_found += found_bits; |
| 2687 | |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2688 | if (cluster->max_size < found_bits * ctl->unit) |
| 2689 | cluster->max_size = found_bits * ctl->unit; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2690 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2691 | if (total_found < want_bits || cluster->max_size < cont1_bytes) { |
| 2692 | i = next_zero + 1; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2693 | goto again; |
| 2694 | } |
| 2695 | |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2696 | cluster->window_start = start * ctl->unit + entry->offset; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2697 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2698 | ret = tree_insert_offset(&cluster->root, entry->offset, |
| 2699 | &entry->offset_index, 1); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 2700 | ASSERT(!ret); /* -EEXIST; Logic error */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2701 | |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2702 | trace_btrfs_setup_cluster(block_group, cluster, |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2703 | total_found * ctl->unit, 1); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2704 | return 0; |
| 2705 | } |
| 2706 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2707 | /* |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2708 | * This searches the block group for just extents to fill the cluster with. |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2709 | * Try to find a cluster with at least bytes total bytes, at least one |
| 2710 | * extent of cont1_bytes, and other clusters of at least min_bytes. |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2711 | */ |
Josef Bacik | 3de85bb | 2011-05-25 13:07:37 -0400 | [diff] [blame] | 2712 | static noinline int |
| 2713 | setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, |
| 2714 | struct btrfs_free_cluster *cluster, |
| 2715 | struct list_head *bitmaps, u64 offset, u64 bytes, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2716 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2717 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2718 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2719 | struct btrfs_free_space *first = NULL; |
| 2720 | struct btrfs_free_space *entry = NULL; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2721 | struct btrfs_free_space *last; |
| 2722 | struct rb_node *node; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2723 | u64 window_free; |
| 2724 | u64 max_extent; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2725 | u64 total_size = 0; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2726 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2727 | entry = tree_search_offset(ctl, offset, 0, 1); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2728 | if (!entry) |
| 2729 | return -ENOSPC; |
| 2730 | |
| 2731 | /* |
| 2732 | * We don't want bitmaps, so just move along until we find a normal |
| 2733 | * extent entry. |
| 2734 | */ |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2735 | while (entry->bitmap || entry->bytes < min_bytes) { |
| 2736 | if (entry->bitmap && list_empty(&entry->list)) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2737 | list_add_tail(&entry->list, bitmaps); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2738 | node = rb_next(&entry->offset_index); |
| 2739 | if (!node) |
| 2740 | return -ENOSPC; |
| 2741 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2742 | } |
| 2743 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2744 | window_free = entry->bytes; |
| 2745 | max_extent = entry->bytes; |
| 2746 | first = entry; |
| 2747 | last = entry; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2748 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2749 | for (node = rb_next(&entry->offset_index); node; |
| 2750 | node = rb_next(&entry->offset_index)) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2751 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2752 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2753 | if (entry->bitmap) { |
| 2754 | if (list_empty(&entry->list)) |
| 2755 | list_add_tail(&entry->list, bitmaps); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2756 | continue; |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2757 | } |
| 2758 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2759 | if (entry->bytes < min_bytes) |
| 2760 | continue; |
| 2761 | |
| 2762 | last = entry; |
| 2763 | window_free += entry->bytes; |
| 2764 | if (entry->bytes > max_extent) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2765 | max_extent = entry->bytes; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2766 | } |
| 2767 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2768 | if (window_free < bytes || max_extent < cont1_bytes) |
| 2769 | return -ENOSPC; |
| 2770 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2771 | cluster->window_start = first->offset; |
| 2772 | |
| 2773 | node = &first->offset_index; |
| 2774 | |
| 2775 | /* |
| 2776 | * now we've found our entries, pull them out of the free space |
| 2777 | * cache and put them into the cluster rbtree |
| 2778 | */ |
| 2779 | do { |
| 2780 | int ret; |
| 2781 | |
| 2782 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2783 | node = rb_next(&entry->offset_index); |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2784 | if (entry->bitmap || entry->bytes < min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2785 | continue; |
| 2786 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2787 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2788 | ret = tree_insert_offset(&cluster->root, entry->offset, |
| 2789 | &entry->offset_index, 0); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2790 | total_size += entry->bytes; |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 2791 | ASSERT(!ret); /* -EEXIST; Logic error */ |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2792 | } while (node && entry != last); |
| 2793 | |
| 2794 | cluster->max_size = max_extent; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2795 | trace_btrfs_setup_cluster(block_group, cluster, total_size, 0); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2796 | return 0; |
| 2797 | } |
| 2798 | |
| 2799 | /* |
| 2800 | * This specifically looks for bitmaps that may work in the cluster, we assume |
| 2801 | * that we have already failed to find extents that will work. |
| 2802 | */ |
Josef Bacik | 3de85bb | 2011-05-25 13:07:37 -0400 | [diff] [blame] | 2803 | static noinline int |
| 2804 | setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, |
| 2805 | struct btrfs_free_cluster *cluster, |
| 2806 | struct list_head *bitmaps, u64 offset, u64 bytes, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2807 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2808 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2809 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2810 | struct btrfs_free_space *entry; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2811 | int ret = -ENOSPC; |
Li Zefan | 0f0fbf1 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2812 | u64 bitmap_offset = offset_to_bitmap(ctl, offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2813 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2814 | if (ctl->total_bitmaps == 0) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2815 | return -ENOSPC; |
| 2816 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2817 | /* |
Li Zefan | 0f0fbf1 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2818 | * The bitmap that covers offset won't be in the list unless offset |
| 2819 | * is just its start offset. |
| 2820 | */ |
| 2821 | entry = list_first_entry(bitmaps, struct btrfs_free_space, list); |
| 2822 | if (entry->offset != bitmap_offset) { |
| 2823 | entry = tree_search_offset(ctl, bitmap_offset, 1, 0); |
| 2824 | if (entry && list_empty(&entry->list)) |
| 2825 | list_add(&entry->list, bitmaps); |
| 2826 | } |
| 2827 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2828 | list_for_each_entry(entry, bitmaps, list) { |
Josef Bacik | 357b978 | 2012-01-26 15:01:11 -0500 | [diff] [blame] | 2829 | if (entry->bytes < bytes) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2830 | continue; |
| 2831 | ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2832 | bytes, cont1_bytes, min_bytes); |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2833 | if (!ret) |
| 2834 | return 0; |
| 2835 | } |
| 2836 | |
| 2837 | /* |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2838 | * The bitmaps list has all the bitmaps that record free space |
| 2839 | * starting after offset, so no more search is required. |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2840 | */ |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2841 | return -ENOSPC; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2842 | } |
| 2843 | |
| 2844 | /* |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2845 | * here we try to find a cluster of blocks in a block group. The goal |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2846 | * is to find at least bytes+empty_size. |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2847 | * We might not find them all in one contiguous area. |
| 2848 | * |
| 2849 | * returns zero and sets up cluster if things worked out, otherwise |
| 2850 | * it returns -enospc |
| 2851 | */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 2852 | int btrfs_find_space_cluster(struct btrfs_root *root, |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2853 | struct btrfs_block_group_cache *block_group, |
| 2854 | struct btrfs_free_cluster *cluster, |
| 2855 | u64 offset, u64 bytes, u64 empty_size) |
| 2856 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2857 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2858 | struct btrfs_free_space *entry, *tmp; |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2859 | LIST_HEAD(bitmaps); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2860 | u64 min_bytes; |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2861 | u64 cont1_bytes; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2862 | int ret; |
| 2863 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2864 | /* |
| 2865 | * Choose the minimum extent size we'll require for this |
| 2866 | * cluster. For SSD_SPREAD, don't allow any fragmentation. |
| 2867 | * For metadata, allow allocates with smaller extents. For |
| 2868 | * data, keep it dense. |
| 2869 | */ |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 2870 | if (btrfs_test_opt(root, SSD_SPREAD)) { |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2871 | cont1_bytes = min_bytes = bytes + empty_size; |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 2872 | } else if (block_group->flags & BTRFS_BLOCK_GROUP_METADATA) { |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2873 | cont1_bytes = bytes; |
| 2874 | min_bytes = block_group->sectorsize; |
| 2875 | } else { |
| 2876 | cont1_bytes = max(bytes, (bytes + empty_size) >> 2); |
| 2877 | min_bytes = block_group->sectorsize; |
| 2878 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2879 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2880 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 7d0d2e8 | 2011-03-18 15:13:42 -0400 | [diff] [blame] | 2881 | |
| 2882 | /* |
| 2883 | * If we know we don't have enough space to make a cluster don't even |
| 2884 | * bother doing all the work to try and find one. |
| 2885 | */ |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2886 | if (ctl->free_space < bytes) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2887 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 7d0d2e8 | 2011-03-18 15:13:42 -0400 | [diff] [blame] | 2888 | return -ENOSPC; |
| 2889 | } |
| 2890 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2891 | spin_lock(&cluster->lock); |
| 2892 | |
| 2893 | /* someone already found a cluster, hooray */ |
| 2894 | if (cluster->block_group) { |
| 2895 | ret = 0; |
| 2896 | goto out; |
| 2897 | } |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2898 | |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2899 | trace_btrfs_find_cluster(block_group, offset, bytes, empty_size, |
| 2900 | min_bytes); |
| 2901 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2902 | ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2903 | bytes + empty_size, |
| 2904 | cont1_bytes, min_bytes); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2905 | if (ret) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2906 | ret = setup_cluster_bitmap(block_group, cluster, &bitmaps, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2907 | offset, bytes + empty_size, |
| 2908 | cont1_bytes, min_bytes); |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2909 | |
| 2910 | /* Clear our temporary list */ |
| 2911 | list_for_each_entry_safe(entry, tmp, &bitmaps, list) |
| 2912 | list_del_init(&entry->list); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2913 | |
| 2914 | if (!ret) { |
| 2915 | atomic_inc(&block_group->count); |
| 2916 | list_add_tail(&cluster->block_group_list, |
| 2917 | &block_group->cluster_list); |
| 2918 | cluster->block_group = block_group; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2919 | } else { |
| 2920 | trace_btrfs_failed_cluster_setup(block_group); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2921 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2922 | out: |
| 2923 | spin_unlock(&cluster->lock); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2924 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2925 | |
| 2926 | return ret; |
| 2927 | } |
| 2928 | |
| 2929 | /* |
| 2930 | * simple code to zero out a cluster |
| 2931 | */ |
| 2932 | void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) |
| 2933 | { |
| 2934 | spin_lock_init(&cluster->lock); |
| 2935 | spin_lock_init(&cluster->refill_lock); |
Eric Paris | 6bef4d3 | 2010-02-23 19:43:04 +0000 | [diff] [blame] | 2936 | cluster->root = RB_ROOT; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2937 | cluster->max_size = 0; |
| 2938 | INIT_LIST_HEAD(&cluster->block_group_list); |
| 2939 | cluster->block_group = NULL; |
| 2940 | } |
| 2941 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2942 | static int do_trimming(struct btrfs_block_group_cache *block_group, |
| 2943 | u64 *total_trimmed, u64 start, u64 bytes, |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 2944 | u64 reserved_start, u64 reserved_bytes, |
| 2945 | struct btrfs_trim_range *trim_entry) |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2946 | { |
| 2947 | struct btrfs_space_info *space_info = block_group->space_info; |
| 2948 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 2949 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2950 | int ret; |
| 2951 | int update = 0; |
| 2952 | u64 trimmed = 0; |
| 2953 | |
| 2954 | spin_lock(&space_info->lock); |
| 2955 | spin_lock(&block_group->lock); |
| 2956 | if (!block_group->ro) { |
| 2957 | block_group->reserved += reserved_bytes; |
| 2958 | space_info->bytes_reserved += reserved_bytes; |
| 2959 | update = 1; |
| 2960 | } |
| 2961 | spin_unlock(&block_group->lock); |
| 2962 | spin_unlock(&space_info->lock); |
| 2963 | |
Filipe Manana | 1edb647b | 2014-12-08 14:01:12 +0000 | [diff] [blame] | 2964 | ret = btrfs_discard_extent(fs_info->extent_root, |
| 2965 | start, bytes, &trimmed); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2966 | if (!ret) |
| 2967 | *total_trimmed += trimmed; |
| 2968 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 2969 | mutex_lock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2970 | btrfs_add_free_space(block_group, reserved_start, reserved_bytes); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 2971 | list_del(&trim_entry->list); |
| 2972 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2973 | |
| 2974 | if (update) { |
| 2975 | spin_lock(&space_info->lock); |
| 2976 | spin_lock(&block_group->lock); |
| 2977 | if (block_group->ro) |
| 2978 | space_info->bytes_readonly += reserved_bytes; |
| 2979 | block_group->reserved -= reserved_bytes; |
| 2980 | space_info->bytes_reserved -= reserved_bytes; |
| 2981 | spin_unlock(&space_info->lock); |
| 2982 | spin_unlock(&block_group->lock); |
| 2983 | } |
| 2984 | |
| 2985 | return ret; |
| 2986 | } |
| 2987 | |
| 2988 | static int trim_no_bitmap(struct btrfs_block_group_cache *block_group, |
| 2989 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2990 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2991 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2992 | struct btrfs_free_space *entry; |
| 2993 | struct rb_node *node; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2994 | int ret = 0; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2995 | u64 extent_start; |
| 2996 | u64 extent_bytes; |
| 2997 | u64 bytes; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2998 | |
| 2999 | while (start < end) { |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3000 | struct btrfs_trim_range trim_entry; |
| 3001 | |
| 3002 | mutex_lock(&ctl->cache_writeout_mutex); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3003 | spin_lock(&ctl->tree_lock); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3004 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3005 | if (ctl->free_space < minlen) { |
| 3006 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3007 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3008 | break; |
| 3009 | } |
| 3010 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3011 | entry = tree_search_offset(ctl, start, 0, 1); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3012 | if (!entry) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3013 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3014 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3015 | break; |
| 3016 | } |
| 3017 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3018 | /* skip bitmaps */ |
| 3019 | while (entry->bitmap) { |
| 3020 | node = rb_next(&entry->offset_index); |
| 3021 | if (!node) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3022 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3023 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3024 | goto out; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3025 | } |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3026 | entry = rb_entry(node, struct btrfs_free_space, |
| 3027 | offset_index); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3028 | } |
| 3029 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3030 | if (entry->offset >= end) { |
| 3031 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3032 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3033 | break; |
| 3034 | } |
| 3035 | |
| 3036 | extent_start = entry->offset; |
| 3037 | extent_bytes = entry->bytes; |
| 3038 | start = max(start, extent_start); |
| 3039 | bytes = min(extent_start + extent_bytes, end) - start; |
| 3040 | if (bytes < minlen) { |
| 3041 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3042 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3043 | goto next; |
| 3044 | } |
| 3045 | |
| 3046 | unlink_free_space(ctl, entry); |
| 3047 | kmem_cache_free(btrfs_free_space_cachep, entry); |
| 3048 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3049 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3050 | trim_entry.start = extent_start; |
| 3051 | trim_entry.bytes = extent_bytes; |
| 3052 | list_add_tail(&trim_entry.list, &ctl->trimming_ranges); |
| 3053 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3054 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3055 | ret = do_trimming(block_group, total_trimmed, start, bytes, |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3056 | extent_start, extent_bytes, &trim_entry); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3057 | if (ret) |
| 3058 | break; |
| 3059 | next: |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3060 | start += bytes; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3061 | |
| 3062 | if (fatal_signal_pending(current)) { |
| 3063 | ret = -ERESTARTSYS; |
| 3064 | break; |
| 3065 | } |
| 3066 | |
| 3067 | cond_resched(); |
| 3068 | } |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3069 | out: |
| 3070 | return ret; |
| 3071 | } |
| 3072 | |
| 3073 | static int trim_bitmaps(struct btrfs_block_group_cache *block_group, |
| 3074 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) |
| 3075 | { |
| 3076 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
| 3077 | struct btrfs_free_space *entry; |
| 3078 | int ret = 0; |
| 3079 | int ret2; |
| 3080 | u64 bytes; |
| 3081 | u64 offset = offset_to_bitmap(ctl, start); |
| 3082 | |
| 3083 | while (offset < end) { |
| 3084 | bool next_bitmap = false; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3085 | struct btrfs_trim_range trim_entry; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3086 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3087 | mutex_lock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3088 | spin_lock(&ctl->tree_lock); |
| 3089 | |
| 3090 | if (ctl->free_space < minlen) { |
| 3091 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3092 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3093 | break; |
| 3094 | } |
| 3095 | |
| 3096 | entry = tree_search_offset(ctl, offset, 1, 0); |
| 3097 | if (!entry) { |
| 3098 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3099 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3100 | next_bitmap = true; |
| 3101 | goto next; |
| 3102 | } |
| 3103 | |
| 3104 | bytes = minlen; |
| 3105 | ret2 = search_bitmap(ctl, entry, &start, &bytes); |
| 3106 | if (ret2 || start >= end) { |
| 3107 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3108 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3109 | next_bitmap = true; |
| 3110 | goto next; |
| 3111 | } |
| 3112 | |
| 3113 | bytes = min(bytes, end - start); |
| 3114 | if (bytes < minlen) { |
| 3115 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3116 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3117 | goto next; |
| 3118 | } |
| 3119 | |
| 3120 | bitmap_clear_bits(ctl, entry, start, bytes); |
| 3121 | if (entry->bytes == 0) |
| 3122 | free_bitmap(ctl, entry); |
| 3123 | |
| 3124 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3125 | trim_entry.start = start; |
| 3126 | trim_entry.bytes = bytes; |
| 3127 | list_add_tail(&trim_entry.list, &ctl->trimming_ranges); |
| 3128 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3129 | |
| 3130 | ret = do_trimming(block_group, total_trimmed, start, bytes, |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3131 | start, bytes, &trim_entry); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3132 | if (ret) |
| 3133 | break; |
| 3134 | next: |
| 3135 | if (next_bitmap) { |
| 3136 | offset += BITS_PER_BITMAP * ctl->unit; |
| 3137 | } else { |
| 3138 | start += bytes; |
| 3139 | if (start >= offset + BITS_PER_BITMAP * ctl->unit) |
| 3140 | offset += BITS_PER_BITMAP * ctl->unit; |
| 3141 | } |
| 3142 | |
| 3143 | if (fatal_signal_pending(current)) { |
| 3144 | ret = -ERESTARTSYS; |
| 3145 | break; |
| 3146 | } |
| 3147 | |
| 3148 | cond_resched(); |
| 3149 | } |
| 3150 | |
| 3151 | return ret; |
| 3152 | } |
| 3153 | |
| 3154 | int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, |
| 3155 | u64 *trimmed, u64 start, u64 end, u64 minlen) |
| 3156 | { |
| 3157 | int ret; |
| 3158 | |
| 3159 | *trimmed = 0; |
| 3160 | |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3161 | spin_lock(&block_group->lock); |
| 3162 | if (block_group->removed) { |
| 3163 | spin_unlock(&block_group->lock); |
| 3164 | return 0; |
| 3165 | } |
| 3166 | atomic_inc(&block_group->trimming); |
| 3167 | spin_unlock(&block_group->lock); |
| 3168 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3169 | ret = trim_no_bitmap(block_group, trimmed, start, end, minlen); |
| 3170 | if (ret) |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3171 | goto out; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3172 | |
| 3173 | ret = trim_bitmaps(block_group, trimmed, start, end, minlen); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3174 | out: |
| 3175 | spin_lock(&block_group->lock); |
| 3176 | if (atomic_dec_and_test(&block_group->trimming) && |
| 3177 | block_group->removed) { |
| 3178 | struct extent_map_tree *em_tree; |
| 3179 | struct extent_map *em; |
| 3180 | |
| 3181 | spin_unlock(&block_group->lock); |
| 3182 | |
Filipe Manana | a1e7e16 | 2014-12-04 15:31:01 +0000 | [diff] [blame] | 3183 | lock_chunks(block_group->fs_info->chunk_root); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3184 | em_tree = &block_group->fs_info->mapping_tree.map_tree; |
| 3185 | write_lock(&em_tree->lock); |
| 3186 | em = lookup_extent_mapping(em_tree, block_group->key.objectid, |
| 3187 | 1); |
| 3188 | BUG_ON(!em); /* logic error, can't happen */ |
Filipe Manana | a1e7e16 | 2014-12-04 15:31:01 +0000 | [diff] [blame] | 3189 | /* |
| 3190 | * remove_extent_mapping() will delete us from the pinned_chunks |
| 3191 | * list, which is protected by the chunk mutex. |
| 3192 | */ |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3193 | remove_extent_mapping(em_tree, em); |
| 3194 | write_unlock(&em_tree->lock); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3195 | unlock_chunks(block_group->fs_info->chunk_root); |
| 3196 | |
| 3197 | /* once for us and once for the tree */ |
| 3198 | free_extent_map(em); |
| 3199 | free_extent_map(em); |
Filipe Manana | 946ddbe | 2014-12-01 17:04:40 +0000 | [diff] [blame] | 3200 | |
| 3201 | /* |
| 3202 | * We've left one free space entry and other tasks trimming |
| 3203 | * this block group have left 1 entry each one. Free them. |
| 3204 | */ |
| 3205 | __btrfs_remove_free_space_cache(block_group->free_space_ctl); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3206 | } else { |
| 3207 | spin_unlock(&block_group->lock); |
| 3208 | } |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3209 | |
| 3210 | return ret; |
| 3211 | } |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 3212 | |
| 3213 | /* |
| 3214 | * Find the left-most item in the cache tree, and then return the |
| 3215 | * smallest inode number in the item. |
| 3216 | * |
| 3217 | * Note: the returned inode number may not be the smallest one in |
| 3218 | * the tree, if the left-most item is a bitmap. |
| 3219 | */ |
| 3220 | u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root) |
| 3221 | { |
| 3222 | struct btrfs_free_space_ctl *ctl = fs_root->free_ino_ctl; |
| 3223 | struct btrfs_free_space *entry = NULL; |
| 3224 | u64 ino = 0; |
| 3225 | |
| 3226 | spin_lock(&ctl->tree_lock); |
| 3227 | |
| 3228 | if (RB_EMPTY_ROOT(&ctl->free_space_offset)) |
| 3229 | goto out; |
| 3230 | |
| 3231 | entry = rb_entry(rb_first(&ctl->free_space_offset), |
| 3232 | struct btrfs_free_space, offset_index); |
| 3233 | |
| 3234 | if (!entry->bitmap) { |
| 3235 | ino = entry->offset; |
| 3236 | |
| 3237 | unlink_free_space(ctl, entry); |
| 3238 | entry->offset++; |
| 3239 | entry->bytes--; |
| 3240 | if (!entry->bytes) |
| 3241 | kmem_cache_free(btrfs_free_space_cachep, entry); |
| 3242 | else |
| 3243 | link_free_space(ctl, entry); |
| 3244 | } else { |
| 3245 | u64 offset = 0; |
| 3246 | u64 count = 1; |
| 3247 | int ret; |
| 3248 | |
| 3249 | ret = search_bitmap(ctl, entry, &offset, &count); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3250 | /* Logic error; Should be empty if it can't find anything */ |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 3251 | ASSERT(!ret); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 3252 | |
| 3253 | ino = offset; |
| 3254 | bitmap_clear_bits(ctl, entry, offset, 1); |
| 3255 | if (entry->bytes == 0) |
| 3256 | free_bitmap(ctl, entry); |
| 3257 | } |
| 3258 | out: |
| 3259 | spin_unlock(&ctl->tree_lock); |
| 3260 | |
| 3261 | return ino; |
| 3262 | } |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3263 | |
| 3264 | struct inode *lookup_free_ino_inode(struct btrfs_root *root, |
| 3265 | struct btrfs_path *path) |
| 3266 | { |
| 3267 | struct inode *inode = NULL; |
| 3268 | |
David Sterba | 57cdc8d | 2014-02-05 02:37:48 +0100 | [diff] [blame] | 3269 | spin_lock(&root->ino_cache_lock); |
| 3270 | if (root->ino_cache_inode) |
| 3271 | inode = igrab(root->ino_cache_inode); |
| 3272 | spin_unlock(&root->ino_cache_lock); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3273 | if (inode) |
| 3274 | return inode; |
| 3275 | |
| 3276 | inode = __lookup_free_space_inode(root, path, 0); |
| 3277 | if (IS_ERR(inode)) |
| 3278 | return inode; |
| 3279 | |
David Sterba | 57cdc8d | 2014-02-05 02:37:48 +0100 | [diff] [blame] | 3280 | spin_lock(&root->ino_cache_lock); |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 3281 | if (!btrfs_fs_closing(root->fs_info)) |
David Sterba | 57cdc8d | 2014-02-05 02:37:48 +0100 | [diff] [blame] | 3282 | root->ino_cache_inode = igrab(inode); |
| 3283 | spin_unlock(&root->ino_cache_lock); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3284 | |
| 3285 | return inode; |
| 3286 | } |
| 3287 | |
| 3288 | int create_free_ino_inode(struct btrfs_root *root, |
| 3289 | struct btrfs_trans_handle *trans, |
| 3290 | struct btrfs_path *path) |
| 3291 | { |
| 3292 | return __create_free_space_inode(root, trans, path, |
| 3293 | BTRFS_FREE_INO_OBJECTID, 0); |
| 3294 | } |
| 3295 | |
| 3296 | int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root) |
| 3297 | { |
| 3298 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; |
| 3299 | struct btrfs_path *path; |
| 3300 | struct inode *inode; |
| 3301 | int ret = 0; |
| 3302 | u64 root_gen = btrfs_root_generation(&root->root_item); |
| 3303 | |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 3304 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 3305 | return 0; |
| 3306 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3307 | /* |
| 3308 | * If we're unmounting then just return, since this does a search on the |
| 3309 | * normal root and not the commit root and we could deadlock. |
| 3310 | */ |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 3311 | if (btrfs_fs_closing(fs_info)) |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3312 | return 0; |
| 3313 | |
| 3314 | path = btrfs_alloc_path(); |
| 3315 | if (!path) |
| 3316 | return 0; |
| 3317 | |
| 3318 | inode = lookup_free_ino_inode(root, path); |
| 3319 | if (IS_ERR(inode)) |
| 3320 | goto out; |
| 3321 | |
| 3322 | if (root_gen != BTRFS_I(inode)->generation) |
| 3323 | goto out_put; |
| 3324 | |
| 3325 | ret = __load_free_space_cache(root, inode, ctl, path, 0); |
| 3326 | |
| 3327 | if (ret < 0) |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 3328 | btrfs_err(fs_info, |
| 3329 | "failed to load free ino cache for root %llu", |
| 3330 | root->root_key.objectid); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3331 | out_put: |
| 3332 | iput(inode); |
| 3333 | out: |
| 3334 | btrfs_free_path(path); |
| 3335 | return ret; |
| 3336 | } |
| 3337 | |
| 3338 | int btrfs_write_out_ino_cache(struct btrfs_root *root, |
| 3339 | struct btrfs_trans_handle *trans, |
Filipe David Borba Manana | 53645a9 | 2013-09-20 14:43:28 +0100 | [diff] [blame] | 3340 | struct btrfs_path *path, |
| 3341 | struct inode *inode) |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3342 | { |
| 3343 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3344 | int ret; |
| 3345 | |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 3346 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 3347 | return 0; |
| 3348 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3349 | ret = __btrfs_write_out_cache(root, inode, ctl, NULL, trans, path, 0); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 3350 | if (ret) { |
| 3351 | btrfs_delalloc_release_metadata(inode, inode->i_size); |
| 3352 | #ifdef DEBUG |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 3353 | btrfs_err(root->fs_info, |
| 3354 | "failed to write free ino cache for root %llu", |
| 3355 | root->root_key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 3356 | #endif |
| 3357 | } |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3358 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3359 | return ret; |
| 3360 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3361 | |
| 3362 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3363 | /* |
| 3364 | * Use this if you need to make a bitmap or extent entry specifically, it |
| 3365 | * doesn't do any of the merging that add_free_space does, this acts a lot like |
| 3366 | * how the free space cache loading stuff works, so you can get really weird |
| 3367 | * configurations. |
| 3368 | */ |
| 3369 | int test_add_free_space_entry(struct btrfs_block_group_cache *cache, |
| 3370 | u64 offset, u64 bytes, bool bitmap) |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3371 | { |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3372 | struct btrfs_free_space_ctl *ctl = cache->free_space_ctl; |
| 3373 | struct btrfs_free_space *info = NULL, *bitmap_info; |
| 3374 | void *map = NULL; |
| 3375 | u64 bytes_added; |
| 3376 | int ret; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3377 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3378 | again: |
| 3379 | if (!info) { |
| 3380 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); |
| 3381 | if (!info) |
| 3382 | return -ENOMEM; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3383 | } |
| 3384 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3385 | if (!bitmap) { |
| 3386 | spin_lock(&ctl->tree_lock); |
| 3387 | info->offset = offset; |
| 3388 | info->bytes = bytes; |
| 3389 | ret = link_free_space(ctl, info); |
| 3390 | spin_unlock(&ctl->tree_lock); |
| 3391 | if (ret) |
| 3392 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 3393 | return ret; |
| 3394 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3395 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3396 | if (!map) { |
| 3397 | map = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
| 3398 | if (!map) { |
| 3399 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 3400 | return -ENOMEM; |
| 3401 | } |
| 3402 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3403 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3404 | spin_lock(&ctl->tree_lock); |
| 3405 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
| 3406 | 1, 0); |
| 3407 | if (!bitmap_info) { |
| 3408 | info->bitmap = map; |
| 3409 | map = NULL; |
| 3410 | add_new_bitmap(ctl, info, offset); |
| 3411 | bitmap_info = info; |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 3412 | info = NULL; |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3413 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3414 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3415 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
| 3416 | bytes -= bytes_added; |
| 3417 | offset += bytes_added; |
| 3418 | spin_unlock(&ctl->tree_lock); |
| 3419 | |
| 3420 | if (bytes) |
| 3421 | goto again; |
| 3422 | |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 3423 | if (info) |
| 3424 | kmem_cache_free(btrfs_free_space_cachep, info); |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3425 | if (map) |
| 3426 | kfree(map); |
| 3427 | return 0; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3428 | } |
| 3429 | |
| 3430 | /* |
| 3431 | * Checks to see if the given range is in the free space cache. This is really |
| 3432 | * just used to check the absence of space, so if there is free space in the |
| 3433 | * range at all we will return 1. |
| 3434 | */ |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3435 | int test_check_exists(struct btrfs_block_group_cache *cache, |
| 3436 | u64 offset, u64 bytes) |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3437 | { |
| 3438 | struct btrfs_free_space_ctl *ctl = cache->free_space_ctl; |
| 3439 | struct btrfs_free_space *info; |
| 3440 | int ret = 0; |
| 3441 | |
| 3442 | spin_lock(&ctl->tree_lock); |
| 3443 | info = tree_search_offset(ctl, offset, 0, 0); |
| 3444 | if (!info) { |
| 3445 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
| 3446 | 1, 0); |
| 3447 | if (!info) |
| 3448 | goto out; |
| 3449 | } |
| 3450 | |
| 3451 | have_info: |
| 3452 | if (info->bitmap) { |
| 3453 | u64 bit_off, bit_bytes; |
| 3454 | struct rb_node *n; |
| 3455 | struct btrfs_free_space *tmp; |
| 3456 | |
| 3457 | bit_off = offset; |
| 3458 | bit_bytes = ctl->unit; |
| 3459 | ret = search_bitmap(ctl, info, &bit_off, &bit_bytes); |
| 3460 | if (!ret) { |
| 3461 | if (bit_off == offset) { |
| 3462 | ret = 1; |
| 3463 | goto out; |
| 3464 | } else if (bit_off > offset && |
| 3465 | offset + bytes > bit_off) { |
| 3466 | ret = 1; |
| 3467 | goto out; |
| 3468 | } |
| 3469 | } |
| 3470 | |
| 3471 | n = rb_prev(&info->offset_index); |
| 3472 | while (n) { |
| 3473 | tmp = rb_entry(n, struct btrfs_free_space, |
| 3474 | offset_index); |
| 3475 | if (tmp->offset + tmp->bytes < offset) |
| 3476 | break; |
| 3477 | if (offset + bytes < tmp->offset) { |
| 3478 | n = rb_prev(&info->offset_index); |
| 3479 | continue; |
| 3480 | } |
| 3481 | info = tmp; |
| 3482 | goto have_info; |
| 3483 | } |
| 3484 | |
| 3485 | n = rb_next(&info->offset_index); |
| 3486 | while (n) { |
| 3487 | tmp = rb_entry(n, struct btrfs_free_space, |
| 3488 | offset_index); |
| 3489 | if (offset + bytes < tmp->offset) |
| 3490 | break; |
| 3491 | if (tmp->offset + tmp->bytes < offset) { |
| 3492 | n = rb_next(&info->offset_index); |
| 3493 | continue; |
| 3494 | } |
| 3495 | info = tmp; |
| 3496 | goto have_info; |
| 3497 | } |
| 3498 | |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 3499 | ret = 0; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3500 | goto out; |
| 3501 | } |
| 3502 | |
| 3503 | if (info->offset == offset) { |
| 3504 | ret = 1; |
| 3505 | goto out; |
| 3506 | } |
| 3507 | |
| 3508 | if (offset > info->offset && offset < info->offset + info->bytes) |
| 3509 | ret = 1; |
| 3510 | out: |
| 3511 | spin_unlock(&ctl->tree_lock); |
| 3512 | return ret; |
| 3513 | } |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3514 | #endif /* CONFIG_BTRFS_FS_RUN_SANITY_TESTS */ |