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, |
Chris Mason | 2b10826 | 2015-04-06 07:48:20 -0700 | [diff] [blame^] | 88 | mapping_gfp_mask(inode->i_mapping) & |
| 89 | ~(GFP_NOFS & ~__GFP_HIGHMEM)); |
Miao Xie | adae52b | 2011-03-31 09:43:23 +0000 | [diff] [blame] | 90 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 91 | return inode; |
| 92 | } |
| 93 | |
| 94 | struct inode *lookup_free_space_inode(struct btrfs_root *root, |
| 95 | struct btrfs_block_group_cache |
| 96 | *block_group, struct btrfs_path *path) |
| 97 | { |
| 98 | struct inode *inode = NULL; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 99 | u32 flags = BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 100 | |
| 101 | spin_lock(&block_group->lock); |
| 102 | if (block_group->inode) |
| 103 | inode = igrab(block_group->inode); |
| 104 | spin_unlock(&block_group->lock); |
| 105 | if (inode) |
| 106 | return inode; |
| 107 | |
| 108 | inode = __lookup_free_space_inode(root, path, |
| 109 | block_group->key.objectid); |
| 110 | if (IS_ERR(inode)) |
| 111 | return inode; |
| 112 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 113 | spin_lock(&block_group->lock); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 114 | if (!((BTRFS_I(inode)->flags & flags) == flags)) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 115 | btrfs_info(root->fs_info, |
| 116 | "Old style space inode found, converting."); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 117 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM | |
| 118 | BTRFS_INODE_NODATACOW; |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 119 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
| 120 | } |
| 121 | |
Josef Bacik | 300e4f8 | 2011-08-29 14:06:00 -0400 | [diff] [blame] | 122 | if (!block_group->iref) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 123 | block_group->inode = igrab(inode); |
| 124 | block_group->iref = 1; |
| 125 | } |
| 126 | spin_unlock(&block_group->lock); |
| 127 | |
| 128 | return inode; |
| 129 | } |
| 130 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 131 | static int __create_free_space_inode(struct btrfs_root *root, |
| 132 | struct btrfs_trans_handle *trans, |
| 133 | struct btrfs_path *path, |
| 134 | u64 ino, u64 offset) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 135 | { |
| 136 | struct btrfs_key key; |
| 137 | struct btrfs_disk_key disk_key; |
| 138 | struct btrfs_free_space_header *header; |
| 139 | struct btrfs_inode_item *inode_item; |
| 140 | struct extent_buffer *leaf; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 141 | u64 flags = BTRFS_INODE_NOCOMPRESS | BTRFS_INODE_PREALLOC; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 142 | int ret; |
| 143 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 144 | ret = btrfs_insert_empty_inode(trans, root, path, ino); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 145 | if (ret) |
| 146 | return ret; |
| 147 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 148 | /* We inline crc's for the free disk space cache */ |
| 149 | if (ino != BTRFS_FREE_INO_OBJECTID) |
| 150 | flags |= BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; |
| 151 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 152 | leaf = path->nodes[0]; |
| 153 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
| 154 | struct btrfs_inode_item); |
| 155 | btrfs_item_key(leaf, &disk_key, path->slots[0]); |
| 156 | memset_extent_buffer(leaf, 0, (unsigned long)inode_item, |
| 157 | sizeof(*inode_item)); |
| 158 | btrfs_set_inode_generation(leaf, inode_item, trans->transid); |
| 159 | btrfs_set_inode_size(leaf, inode_item, 0); |
| 160 | btrfs_set_inode_nbytes(leaf, inode_item, 0); |
| 161 | btrfs_set_inode_uid(leaf, inode_item, 0); |
| 162 | btrfs_set_inode_gid(leaf, inode_item, 0); |
| 163 | btrfs_set_inode_mode(leaf, inode_item, S_IFREG | 0600); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 164 | btrfs_set_inode_flags(leaf, inode_item, flags); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 165 | btrfs_set_inode_nlink(leaf, inode_item, 1); |
| 166 | btrfs_set_inode_transid(leaf, inode_item, trans->transid); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 167 | btrfs_set_inode_block_group(leaf, inode_item, offset); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 168 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 169 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 170 | |
| 171 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 172 | key.offset = offset; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 173 | key.type = 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 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 | } |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 180 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 181 | leaf = path->nodes[0]; |
| 182 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 183 | struct btrfs_free_space_header); |
| 184 | memset_extent_buffer(leaf, 0, (unsigned long)header, sizeof(*header)); |
| 185 | btrfs_set_free_space_key(leaf, header, &disk_key); |
| 186 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 187 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 188 | |
| 189 | return 0; |
| 190 | } |
| 191 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 192 | int create_free_space_inode(struct btrfs_root *root, |
| 193 | struct btrfs_trans_handle *trans, |
| 194 | struct btrfs_block_group_cache *block_group, |
| 195 | struct btrfs_path *path) |
| 196 | { |
| 197 | int ret; |
| 198 | u64 ino; |
| 199 | |
| 200 | ret = btrfs_find_free_objectid(root, &ino); |
| 201 | if (ret < 0) |
| 202 | return ret; |
| 203 | |
| 204 | return __create_free_space_inode(root, trans, path, ino, |
| 205 | block_group->key.objectid); |
| 206 | } |
| 207 | |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 208 | int btrfs_check_trunc_cache_free_space(struct btrfs_root *root, |
| 209 | struct btrfs_block_rsv *rsv) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 210 | { |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 211 | u64 needed_bytes; |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 212 | int ret; |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 213 | |
| 214 | /* 1 for slack space, 1 for updating the inode */ |
| 215 | needed_bytes = btrfs_calc_trunc_metadata_size(root, 1) + |
| 216 | btrfs_calc_trans_metadata_size(root, 1); |
| 217 | |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 218 | spin_lock(&rsv->lock); |
| 219 | if (rsv->reserved < needed_bytes) |
| 220 | ret = -ENOSPC; |
| 221 | else |
| 222 | ret = 0; |
| 223 | spin_unlock(&rsv->lock); |
Wei Yongjun | 4b286cd | 2013-05-21 02:39:21 +0000 | [diff] [blame] | 224 | return ret; |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | int btrfs_truncate_free_space_cache(struct btrfs_root *root, |
| 228 | struct btrfs_trans_handle *trans, |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 229 | struct inode *inode) |
| 230 | { |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 231 | int ret = 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 232 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 233 | btrfs_i_size_write(inode, 0); |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame] | 234 | truncate_pagecache(inode, 0); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 235 | |
| 236 | /* |
| 237 | * We don't need an orphan item because truncating the free space cache |
| 238 | * will never be split across transactions. |
Chris Mason | 28ed134 | 2014-12-17 09:41:04 -0800 | [diff] [blame] | 239 | * We don't need to check for -EAGAIN because we're a free space |
| 240 | * cache inode |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 241 | */ |
| 242 | ret = btrfs_truncate_inode_items(trans, root, inode, |
| 243 | 0, BTRFS_EXTENT_DATA_KEY); |
| 244 | if (ret) { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 245 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 246 | return ret; |
| 247 | } |
| 248 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 249 | ret = btrfs_update_inode(trans, root, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 250 | if (ret) |
| 251 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 252 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 253 | return ret; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 254 | } |
| 255 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 256 | static int readahead_cache(struct inode *inode) |
| 257 | { |
| 258 | struct file_ra_state *ra; |
| 259 | unsigned long last_index; |
| 260 | |
| 261 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
| 262 | if (!ra) |
| 263 | return -ENOMEM; |
| 264 | |
| 265 | file_ra_state_init(ra, inode->i_mapping); |
| 266 | last_index = (i_size_read(inode) - 1) >> PAGE_CACHE_SHIFT; |
| 267 | |
| 268 | page_cache_sync_readahead(inode->i_mapping, ra, NULL, 0, last_index); |
| 269 | |
| 270 | kfree(ra); |
| 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 275 | static int io_ctl_init(struct btrfs_io_ctl *io_ctl, struct inode *inode, |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 276 | struct btrfs_root *root, int write) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 277 | { |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 278 | int num_pages; |
| 279 | int check_crcs = 0; |
| 280 | |
David Sterba | ed6078f | 2014-06-05 01:59:57 +0200 | [diff] [blame] | 281 | num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 282 | |
| 283 | if (btrfs_ino(inode) != BTRFS_FREE_INO_OBJECTID) |
| 284 | check_crcs = 1; |
| 285 | |
| 286 | /* Make sure we can fit our crcs into the first page */ |
| 287 | if (write && check_crcs && |
| 288 | (num_pages * sizeof(u32)) >= PAGE_CACHE_SIZE) |
| 289 | return -ENOSPC; |
| 290 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 291 | memset(io_ctl, 0, sizeof(struct btrfs_io_ctl)); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 292 | |
David Sterba | 31e818f | 2015-02-20 18:00:26 +0100 | [diff] [blame] | 293 | io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 294 | if (!io_ctl->pages) |
| 295 | return -ENOMEM; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 296 | |
| 297 | io_ctl->num_pages = num_pages; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 298 | io_ctl->root = root; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 299 | io_ctl->check_crcs = check_crcs; |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 300 | io_ctl->inode = inode; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 301 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 302 | return 0; |
| 303 | } |
| 304 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 305 | static void io_ctl_free(struct btrfs_io_ctl *io_ctl) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 306 | { |
| 307 | kfree(io_ctl->pages); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 308 | io_ctl->pages = NULL; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 309 | } |
| 310 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 311 | static void io_ctl_unmap_page(struct btrfs_io_ctl *io_ctl) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 312 | { |
| 313 | if (io_ctl->cur) { |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 314 | io_ctl->cur = NULL; |
| 315 | io_ctl->orig = NULL; |
| 316 | } |
| 317 | } |
| 318 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 319 | static void io_ctl_map_page(struct btrfs_io_ctl *io_ctl, int clear) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 320 | { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 321 | ASSERT(io_ctl->index < io_ctl->num_pages); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 322 | io_ctl->page = io_ctl->pages[io_ctl->index++]; |
Chris Mason | 2b10826 | 2015-04-06 07:48:20 -0700 | [diff] [blame^] | 323 | io_ctl->cur = page_address(io_ctl->page); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 324 | io_ctl->orig = io_ctl->cur; |
| 325 | io_ctl->size = PAGE_CACHE_SIZE; |
| 326 | if (clear) |
| 327 | memset(io_ctl->cur, 0, PAGE_CACHE_SIZE); |
| 328 | } |
| 329 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 330 | static void io_ctl_drop_pages(struct btrfs_io_ctl *io_ctl) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 331 | { |
| 332 | int i; |
| 333 | |
| 334 | io_ctl_unmap_page(io_ctl); |
| 335 | |
| 336 | for (i = 0; i < io_ctl->num_pages; i++) { |
Li Zefan | a1ee5a4 | 2012-01-09 14:27:42 +0800 | [diff] [blame] | 337 | if (io_ctl->pages[i]) { |
| 338 | ClearPageChecked(io_ctl->pages[i]); |
| 339 | unlock_page(io_ctl->pages[i]); |
| 340 | page_cache_release(io_ctl->pages[i]); |
| 341 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 342 | } |
| 343 | } |
| 344 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 345 | static int io_ctl_prepare_pages(struct btrfs_io_ctl *io_ctl, struct inode *inode, |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 346 | int uptodate) |
| 347 | { |
| 348 | struct page *page; |
| 349 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
| 350 | int i; |
| 351 | |
| 352 | for (i = 0; i < io_ctl->num_pages; i++) { |
| 353 | page = find_or_create_page(inode->i_mapping, i, mask); |
| 354 | if (!page) { |
| 355 | io_ctl_drop_pages(io_ctl); |
| 356 | return -ENOMEM; |
| 357 | } |
| 358 | io_ctl->pages[i] = page; |
| 359 | if (uptodate && !PageUptodate(page)) { |
| 360 | btrfs_readpage(NULL, page); |
| 361 | lock_page(page); |
| 362 | if (!PageUptodate(page)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 363 | btrfs_err(BTRFS_I(inode)->root->fs_info, |
| 364 | "error reading free space cache"); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 365 | io_ctl_drop_pages(io_ctl); |
| 366 | return -EIO; |
| 367 | } |
| 368 | } |
| 369 | } |
| 370 | |
Josef Bacik | f7d61dc | 2011-11-15 09:31:24 -0500 | [diff] [blame] | 371 | for (i = 0; i < io_ctl->num_pages; i++) { |
| 372 | clear_page_dirty_for_io(io_ctl->pages[i]); |
| 373 | set_page_extent_mapped(io_ctl->pages[i]); |
| 374 | } |
| 375 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 376 | return 0; |
| 377 | } |
| 378 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 379 | static void io_ctl_set_generation(struct btrfs_io_ctl *io_ctl, u64 generation) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 380 | { |
Al Viro | 528c032 | 2012-04-13 11:03:55 -0400 | [diff] [blame] | 381 | __le64 *val; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 382 | |
| 383 | io_ctl_map_page(io_ctl, 1); |
| 384 | |
| 385 | /* |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 386 | * Skip the csum areas. If we don't check crcs then we just have a |
| 387 | * 64bit chunk at the front of the first page. |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 388 | */ |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 389 | if (io_ctl->check_crcs) { |
| 390 | io_ctl->cur += (sizeof(u32) * io_ctl->num_pages); |
| 391 | io_ctl->size -= sizeof(u64) + (sizeof(u32) * io_ctl->num_pages); |
| 392 | } else { |
| 393 | io_ctl->cur += sizeof(u64); |
| 394 | io_ctl->size -= sizeof(u64) * 2; |
| 395 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 396 | |
| 397 | val = io_ctl->cur; |
| 398 | *val = cpu_to_le64(generation); |
| 399 | io_ctl->cur += sizeof(u64); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 400 | } |
| 401 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 402 | static int io_ctl_check_generation(struct btrfs_io_ctl *io_ctl, u64 generation) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 403 | { |
Al Viro | 528c032 | 2012-04-13 11:03:55 -0400 | [diff] [blame] | 404 | __le64 *gen; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 405 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 406 | /* |
| 407 | * Skip the crc area. If we don't check crcs then we just have a 64bit |
| 408 | * chunk at the front of the first page. |
| 409 | */ |
| 410 | if (io_ctl->check_crcs) { |
| 411 | io_ctl->cur += sizeof(u32) * io_ctl->num_pages; |
| 412 | io_ctl->size -= sizeof(u64) + |
| 413 | (sizeof(u32) * io_ctl->num_pages); |
| 414 | } else { |
| 415 | io_ctl->cur += sizeof(u64); |
| 416 | io_ctl->size -= sizeof(u64) * 2; |
| 417 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 418 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 419 | gen = io_ctl->cur; |
| 420 | if (le64_to_cpu(*gen) != generation) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 421 | printk_ratelimited(KERN_ERR "BTRFS: space cache generation " |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 422 | "(%Lu) does not match inode (%Lu)\n", *gen, |
| 423 | generation); |
| 424 | io_ctl_unmap_page(io_ctl); |
| 425 | return -EIO; |
| 426 | } |
| 427 | io_ctl->cur += sizeof(u64); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 428 | return 0; |
| 429 | } |
| 430 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 431 | static void io_ctl_set_crc(struct btrfs_io_ctl *io_ctl, int index) |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 432 | { |
| 433 | u32 *tmp; |
| 434 | u32 crc = ~(u32)0; |
| 435 | unsigned offset = 0; |
| 436 | |
| 437 | if (!io_ctl->check_crcs) { |
| 438 | io_ctl_unmap_page(io_ctl); |
| 439 | return; |
| 440 | } |
| 441 | |
| 442 | if (index == 0) |
Justin P. Mattock | cb54f25 | 2011-11-21 08:43:28 -0800 | [diff] [blame] | 443 | offset = sizeof(u32) * io_ctl->num_pages; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 444 | |
Liu Bo | b049668 | 2013-03-14 14:57:45 +0000 | [diff] [blame] | 445 | crc = btrfs_csum_data(io_ctl->orig + offset, crc, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 446 | PAGE_CACHE_SIZE - offset); |
| 447 | btrfs_csum_final(crc, (char *)&crc); |
| 448 | io_ctl_unmap_page(io_ctl); |
Chris Mason | 2b10826 | 2015-04-06 07:48:20 -0700 | [diff] [blame^] | 449 | tmp = page_address(io_ctl->pages[0]); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 450 | tmp += index; |
| 451 | *tmp = crc; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 452 | } |
| 453 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 454 | static int io_ctl_check_crc(struct btrfs_io_ctl *io_ctl, int index) |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 455 | { |
| 456 | u32 *tmp, val; |
| 457 | u32 crc = ~(u32)0; |
| 458 | unsigned offset = 0; |
| 459 | |
| 460 | if (!io_ctl->check_crcs) { |
| 461 | io_ctl_map_page(io_ctl, 0); |
| 462 | return 0; |
| 463 | } |
| 464 | |
| 465 | if (index == 0) |
| 466 | offset = sizeof(u32) * io_ctl->num_pages; |
| 467 | |
Chris Mason | 2b10826 | 2015-04-06 07:48:20 -0700 | [diff] [blame^] | 468 | tmp = page_address(io_ctl->pages[0]); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 469 | tmp += index; |
| 470 | val = *tmp; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 471 | |
| 472 | io_ctl_map_page(io_ctl, 0); |
Liu Bo | b049668 | 2013-03-14 14:57:45 +0000 | [diff] [blame] | 473 | crc = btrfs_csum_data(io_ctl->orig + offset, crc, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 474 | PAGE_CACHE_SIZE - offset); |
| 475 | btrfs_csum_final(crc, (char *)&crc); |
| 476 | if (val != crc) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 477 | printk_ratelimited(KERN_ERR "BTRFS: csum mismatch on free " |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 478 | "space cache\n"); |
| 479 | io_ctl_unmap_page(io_ctl); |
| 480 | return -EIO; |
| 481 | } |
| 482 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 483 | return 0; |
| 484 | } |
| 485 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 486 | static int io_ctl_add_entry(struct btrfs_io_ctl *io_ctl, u64 offset, u64 bytes, |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 487 | void *bitmap) |
| 488 | { |
| 489 | struct btrfs_free_space_entry *entry; |
| 490 | |
| 491 | if (!io_ctl->cur) |
| 492 | return -ENOSPC; |
| 493 | |
| 494 | entry = io_ctl->cur; |
| 495 | entry->offset = cpu_to_le64(offset); |
| 496 | entry->bytes = cpu_to_le64(bytes); |
| 497 | entry->type = (bitmap) ? BTRFS_FREE_SPACE_BITMAP : |
| 498 | BTRFS_FREE_SPACE_EXTENT; |
| 499 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); |
| 500 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); |
| 501 | |
| 502 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) |
| 503 | return 0; |
| 504 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 505 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 506 | |
| 507 | /* No more pages to map */ |
| 508 | if (io_ctl->index >= io_ctl->num_pages) |
| 509 | return 0; |
| 510 | |
| 511 | /* map the next page */ |
| 512 | io_ctl_map_page(io_ctl, 1); |
| 513 | return 0; |
| 514 | } |
| 515 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 516 | static int io_ctl_add_bitmap(struct btrfs_io_ctl *io_ctl, void *bitmap) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 517 | { |
| 518 | if (!io_ctl->cur) |
| 519 | return -ENOSPC; |
| 520 | |
| 521 | /* |
| 522 | * If we aren't at the start of the current page, unmap this one and |
| 523 | * map the next one if there is any left. |
| 524 | */ |
| 525 | if (io_ctl->cur != io_ctl->orig) { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 526 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 527 | if (io_ctl->index >= io_ctl->num_pages) |
| 528 | return -ENOSPC; |
| 529 | io_ctl_map_page(io_ctl, 0); |
| 530 | } |
| 531 | |
| 532 | memcpy(io_ctl->cur, bitmap, PAGE_CACHE_SIZE); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 533 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 534 | if (io_ctl->index < io_ctl->num_pages) |
| 535 | io_ctl_map_page(io_ctl, 0); |
| 536 | return 0; |
| 537 | } |
| 538 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 539 | static void io_ctl_zero_remaining_pages(struct btrfs_io_ctl *io_ctl) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 540 | { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 541 | /* |
| 542 | * If we're not on the boundary we know we've modified the page and we |
| 543 | * need to crc the page. |
| 544 | */ |
| 545 | if (io_ctl->cur != io_ctl->orig) |
| 546 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
| 547 | else |
| 548 | io_ctl_unmap_page(io_ctl); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 549 | |
| 550 | while (io_ctl->index < io_ctl->num_pages) { |
| 551 | io_ctl_map_page(io_ctl, 1); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 552 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 553 | } |
| 554 | } |
| 555 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 556 | static int io_ctl_read_entry(struct btrfs_io_ctl *io_ctl, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 557 | struct btrfs_free_space *entry, u8 *type) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 558 | { |
| 559 | struct btrfs_free_space_entry *e; |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 560 | int ret; |
| 561 | |
| 562 | if (!io_ctl->cur) { |
| 563 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); |
| 564 | if (ret) |
| 565 | return ret; |
| 566 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 567 | |
| 568 | e = io_ctl->cur; |
| 569 | entry->offset = le64_to_cpu(e->offset); |
| 570 | entry->bytes = le64_to_cpu(e->bytes); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 571 | *type = e->type; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 572 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); |
| 573 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); |
| 574 | |
| 575 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 576 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 577 | |
| 578 | io_ctl_unmap_page(io_ctl); |
| 579 | |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 580 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 581 | } |
| 582 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 583 | static int io_ctl_read_bitmap(struct btrfs_io_ctl *io_ctl, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 584 | struct btrfs_free_space *entry) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 585 | { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 586 | int ret; |
| 587 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 588 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); |
| 589 | if (ret) |
| 590 | return ret; |
| 591 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 592 | memcpy(entry->bitmap, io_ctl->cur, PAGE_CACHE_SIZE); |
| 593 | io_ctl_unmap_page(io_ctl); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 594 | |
| 595 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 596 | } |
| 597 | |
Josef Bacik | cd023e7 | 2012-05-14 10:06:40 -0400 | [diff] [blame] | 598 | /* |
| 599 | * Since we attach pinned extents after the fact we can have contiguous sections |
| 600 | * of free space that are split up in entries. This poses a problem with the |
| 601 | * tree logging stuff since it could have allocated across what appears to be 2 |
| 602 | * entries since we would have merged the entries when adding the pinned extents |
| 603 | * back to the free space cache. So run through the space cache that we just |
| 604 | * loaded and merge contiguous entries. This will make the log replay stuff not |
| 605 | * blow up and it will make for nicer allocator behavior. |
| 606 | */ |
| 607 | static void merge_space_tree(struct btrfs_free_space_ctl *ctl) |
| 608 | { |
| 609 | struct btrfs_free_space *e, *prev = NULL; |
| 610 | struct rb_node *n; |
| 611 | |
| 612 | again: |
| 613 | spin_lock(&ctl->tree_lock); |
| 614 | for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) { |
| 615 | e = rb_entry(n, struct btrfs_free_space, offset_index); |
| 616 | if (!prev) |
| 617 | goto next; |
| 618 | if (e->bitmap || prev->bitmap) |
| 619 | goto next; |
| 620 | if (prev->offset + prev->bytes == e->offset) { |
| 621 | unlink_free_space(ctl, prev); |
| 622 | unlink_free_space(ctl, e); |
| 623 | prev->bytes += e->bytes; |
| 624 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 625 | link_free_space(ctl, prev); |
| 626 | prev = NULL; |
| 627 | spin_unlock(&ctl->tree_lock); |
| 628 | goto again; |
| 629 | } |
| 630 | next: |
| 631 | prev = e; |
| 632 | } |
| 633 | spin_unlock(&ctl->tree_lock); |
| 634 | } |
| 635 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 636 | static int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, |
| 637 | struct btrfs_free_space_ctl *ctl, |
| 638 | struct btrfs_path *path, u64 offset) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 639 | { |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 640 | struct btrfs_free_space_header *header; |
| 641 | struct extent_buffer *leaf; |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 642 | struct btrfs_io_ctl io_ctl; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 643 | struct btrfs_key key; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 644 | struct btrfs_free_space *e, *n; |
Gui Hecheng | b76808f | 2014-12-31 09:51:35 +0800 | [diff] [blame] | 645 | LIST_HEAD(bitmaps); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 646 | u64 num_entries; |
| 647 | u64 num_bitmaps; |
| 648 | u64 generation; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 649 | u8 type; |
Josef Bacik | f6a3982 | 2011-06-06 10:50:35 -0400 | [diff] [blame] | 650 | int ret = 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 651 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 652 | /* Nothing in the space cache, goodbye */ |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 653 | if (!i_size_read(inode)) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 654 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 655 | |
| 656 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 657 | key.offset = offset; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 658 | key.type = 0; |
| 659 | |
| 660 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 661 | if (ret < 0) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 662 | return 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 663 | else if (ret > 0) { |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 664 | btrfs_release_path(path); |
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 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 668 | ret = -1; |
| 669 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 670 | leaf = path->nodes[0]; |
| 671 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 672 | struct btrfs_free_space_header); |
| 673 | num_entries = btrfs_free_space_entries(leaf, header); |
| 674 | num_bitmaps = btrfs_free_space_bitmaps(leaf, header); |
| 675 | generation = btrfs_free_space_generation(leaf, header); |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 676 | btrfs_release_path(path); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 677 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 678 | if (!BTRFS_I(inode)->generation) { |
| 679 | btrfs_info(root->fs_info, |
| 680 | "The free space cache file (%llu) is invalid. skip it\n", |
| 681 | offset); |
| 682 | return 0; |
| 683 | } |
| 684 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 685 | if (BTRFS_I(inode)->generation != generation) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 686 | btrfs_err(root->fs_info, |
| 687 | "free space inode generation (%llu) " |
| 688 | "did not match free space cache generation (%llu)", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 689 | BTRFS_I(inode)->generation, generation); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 690 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 691 | } |
| 692 | |
| 693 | if (!num_entries) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 694 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 695 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 696 | ret = io_ctl_init(&io_ctl, inode, root, 0); |
Li Zefan | 706efc6 | 2012-01-09 14:36:28 +0800 | [diff] [blame] | 697 | if (ret) |
| 698 | return ret; |
| 699 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 700 | ret = readahead_cache(inode); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 701 | if (ret) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 702 | goto out; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 703 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 704 | ret = io_ctl_prepare_pages(&io_ctl, inode, 1); |
| 705 | if (ret) |
| 706 | goto out; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 707 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 708 | ret = io_ctl_check_crc(&io_ctl, 0); |
| 709 | if (ret) |
| 710 | goto free_cache; |
| 711 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 712 | ret = io_ctl_check_generation(&io_ctl, generation); |
| 713 | if (ret) |
| 714 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 715 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 716 | while (num_entries) { |
| 717 | e = kmem_cache_zalloc(btrfs_free_space_cachep, |
| 718 | GFP_NOFS); |
| 719 | if (!e) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 720 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 721 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 722 | ret = io_ctl_read_entry(&io_ctl, e, &type); |
| 723 | if (ret) { |
| 724 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 725 | goto free_cache; |
| 726 | } |
| 727 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 728 | if (!e->bytes) { |
| 729 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 730 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 731 | } |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 732 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 733 | if (type == BTRFS_FREE_SPACE_EXTENT) { |
| 734 | spin_lock(&ctl->tree_lock); |
| 735 | ret = link_free_space(ctl, e); |
| 736 | spin_unlock(&ctl->tree_lock); |
| 737 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 738 | btrfs_err(root->fs_info, |
| 739 | "Duplicate entries in free space cache, dumping"); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 740 | kmem_cache_free(btrfs_free_space_cachep, e); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 741 | goto free_cache; |
| 742 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 743 | } else { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 744 | ASSERT(num_bitmaps); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 745 | num_bitmaps--; |
| 746 | e->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
| 747 | if (!e->bitmap) { |
| 748 | kmem_cache_free( |
| 749 | btrfs_free_space_cachep, e); |
| 750 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 751 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 752 | spin_lock(&ctl->tree_lock); |
| 753 | ret = link_free_space(ctl, e); |
| 754 | ctl->total_bitmaps++; |
| 755 | ctl->op->recalc_thresholds(ctl); |
| 756 | spin_unlock(&ctl->tree_lock); |
| 757 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 758 | btrfs_err(root->fs_info, |
| 759 | "Duplicate entries in free space cache, dumping"); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 760 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 761 | goto free_cache; |
| 762 | } |
| 763 | list_add_tail(&e->list, &bitmaps); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 764 | } |
| 765 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 766 | num_entries--; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 767 | } |
| 768 | |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 769 | io_ctl_unmap_page(&io_ctl); |
| 770 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 771 | /* |
| 772 | * We add the bitmaps at the end of the entries in order that |
| 773 | * the bitmap entries are added to the cache. |
| 774 | */ |
| 775 | list_for_each_entry_safe(e, n, &bitmaps, list) { |
| 776 | list_del_init(&e->list); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 777 | ret = io_ctl_read_bitmap(&io_ctl, e); |
| 778 | if (ret) |
| 779 | goto free_cache; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 780 | } |
| 781 | |
| 782 | io_ctl_drop_pages(&io_ctl); |
Josef Bacik | cd023e7 | 2012-05-14 10:06:40 -0400 | [diff] [blame] | 783 | merge_space_tree(ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 784 | ret = 1; |
| 785 | out: |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 786 | io_ctl_free(&io_ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 787 | return ret; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 788 | free_cache: |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 789 | io_ctl_drop_pages(&io_ctl); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 790 | __btrfs_remove_free_space_cache(ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 791 | goto out; |
| 792 | } |
| 793 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 794 | int load_free_space_cache(struct btrfs_fs_info *fs_info, |
| 795 | struct btrfs_block_group_cache *block_group) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 796 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 797 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 798 | struct btrfs_root *root = fs_info->tree_root; |
| 799 | struct inode *inode; |
| 800 | struct btrfs_path *path; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 801 | int ret = 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 802 | bool matched; |
| 803 | u64 used = btrfs_block_group_used(&block_group->item); |
| 804 | |
| 805 | /* |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 806 | * If this block group has been marked to be cleared for one reason or |
| 807 | * another then we can't trust the on disk cache, so just return. |
| 808 | */ |
| 809 | spin_lock(&block_group->lock); |
| 810 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
| 811 | spin_unlock(&block_group->lock); |
| 812 | return 0; |
| 813 | } |
| 814 | spin_unlock(&block_group->lock); |
| 815 | |
| 816 | path = btrfs_alloc_path(); |
| 817 | if (!path) |
| 818 | return 0; |
Josef Bacik | d53ba47 | 2012-04-12 16:03:57 -0400 | [diff] [blame] | 819 | path->search_commit_root = 1; |
| 820 | path->skip_locking = 1; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 821 | |
| 822 | inode = lookup_free_space_inode(root, block_group, path); |
| 823 | if (IS_ERR(inode)) { |
| 824 | btrfs_free_path(path); |
| 825 | return 0; |
| 826 | } |
| 827 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 828 | /* We may have converted the inode and made the cache invalid. */ |
| 829 | spin_lock(&block_group->lock); |
| 830 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
| 831 | spin_unlock(&block_group->lock); |
Tsutomu Itoh | a7e221e | 2012-02-14 17:12:23 +0900 | [diff] [blame] | 832 | btrfs_free_path(path); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 833 | goto out; |
| 834 | } |
| 835 | spin_unlock(&block_group->lock); |
| 836 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 837 | ret = __load_free_space_cache(fs_info->tree_root, inode, ctl, |
| 838 | path, block_group->key.objectid); |
| 839 | btrfs_free_path(path); |
| 840 | if (ret <= 0) |
| 841 | goto out; |
| 842 | |
| 843 | spin_lock(&ctl->tree_lock); |
| 844 | matched = (ctl->free_space == (block_group->key.offset - used - |
| 845 | block_group->bytes_super)); |
| 846 | spin_unlock(&ctl->tree_lock); |
| 847 | |
| 848 | if (!matched) { |
| 849 | __btrfs_remove_free_space_cache(ctl); |
Miao Xie | 32d6b47 | 2014-04-24 13:31:55 +0800 | [diff] [blame] | 850 | 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] | 851 | block_group->key.objectid); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 852 | ret = -1; |
| 853 | } |
| 854 | out: |
| 855 | if (ret < 0) { |
| 856 | /* This cache is bogus, make sure it gets cleared */ |
| 857 | spin_lock(&block_group->lock); |
| 858 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
| 859 | spin_unlock(&block_group->lock); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 860 | ret = 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 861 | |
Miao Xie | 32d6b47 | 2014-04-24 13:31:55 +0800 | [diff] [blame] | 862 | 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] | 863 | block_group->key.objectid); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 864 | } |
| 865 | |
| 866 | iput(inode); |
| 867 | return ret; |
| 868 | } |
| 869 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 870 | static noinline_for_stack |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 871 | int write_cache_extent_entries(struct btrfs_io_ctl *io_ctl, |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 872 | struct btrfs_free_space_ctl *ctl, |
| 873 | struct btrfs_block_group_cache *block_group, |
| 874 | int *entries, int *bitmaps, |
| 875 | struct list_head *bitmap_list) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 876 | { |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 877 | int ret; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 878 | struct btrfs_free_cluster *cluster = NULL; |
| 879 | struct rb_node *node = rb_first(&ctl->free_space_offset); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 880 | struct btrfs_trim_range *trim_entry; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 881 | |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 882 | /* Get the cluster for this block_group if it exists */ |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 883 | if (block_group && !list_empty(&block_group->cluster_list)) { |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 884 | cluster = list_entry(block_group->cluster_list.next, |
| 885 | struct btrfs_free_cluster, |
| 886 | block_group_list); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 887 | } |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 888 | |
Josef Bacik | f75b130 | 2011-10-05 10:00:18 -0400 | [diff] [blame] | 889 | if (!node && cluster) { |
| 890 | node = rb_first(&cluster->root); |
| 891 | cluster = NULL; |
| 892 | } |
| 893 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 894 | /* Write out the extent entries */ |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 895 | while (node) { |
| 896 | struct btrfs_free_space *e; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 897 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 898 | e = rb_entry(node, struct btrfs_free_space, offset_index); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 899 | *entries += 1; |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 900 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 901 | ret = io_ctl_add_entry(io_ctl, e->offset, e->bytes, |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 902 | e->bitmap); |
| 903 | if (ret) |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 904 | goto fail; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 905 | |
| 906 | if (e->bitmap) { |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 907 | list_add_tail(&e->list, bitmap_list); |
| 908 | *bitmaps += 1; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 909 | } |
| 910 | node = rb_next(node); |
| 911 | if (!node && cluster) { |
| 912 | node = rb_first(&cluster->root); |
| 913 | cluster = NULL; |
| 914 | } |
| 915 | } |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 916 | |
| 917 | /* |
| 918 | * Make sure we don't miss any range that was removed from our rbtree |
| 919 | * because trimming is running. Otherwise after a umount+mount (or crash |
| 920 | * after committing the transaction) we would leak free space and get |
| 921 | * an inconsistent free space cache report from fsck. |
| 922 | */ |
| 923 | list_for_each_entry(trim_entry, &ctl->trimming_ranges, list) { |
| 924 | ret = io_ctl_add_entry(io_ctl, trim_entry->start, |
| 925 | trim_entry->bytes, NULL); |
| 926 | if (ret) |
| 927 | goto fail; |
| 928 | *entries += 1; |
| 929 | } |
| 930 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 931 | return 0; |
| 932 | fail: |
| 933 | return -ENOSPC; |
| 934 | } |
| 935 | |
| 936 | static noinline_for_stack int |
| 937 | update_cache_item(struct btrfs_trans_handle *trans, |
| 938 | struct btrfs_root *root, |
| 939 | struct inode *inode, |
| 940 | struct btrfs_path *path, u64 offset, |
| 941 | int entries, int bitmaps) |
| 942 | { |
| 943 | struct btrfs_key key; |
| 944 | struct btrfs_free_space_header *header; |
| 945 | struct extent_buffer *leaf; |
| 946 | int ret; |
| 947 | |
| 948 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
| 949 | key.offset = offset; |
| 950 | key.type = 0; |
| 951 | |
| 952 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 953 | if (ret < 0) { |
| 954 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1, |
| 955 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL, |
| 956 | GFP_NOFS); |
| 957 | goto fail; |
| 958 | } |
| 959 | leaf = path->nodes[0]; |
| 960 | if (ret > 0) { |
| 961 | struct btrfs_key found_key; |
| 962 | ASSERT(path->slots[0]); |
| 963 | path->slots[0]--; |
| 964 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 965 | if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID || |
| 966 | found_key.offset != offset) { |
| 967 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, |
| 968 | inode->i_size - 1, |
| 969 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, |
| 970 | NULL, GFP_NOFS); |
| 971 | btrfs_release_path(path); |
| 972 | goto fail; |
| 973 | } |
| 974 | } |
| 975 | |
| 976 | BTRFS_I(inode)->generation = trans->transid; |
| 977 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 978 | struct btrfs_free_space_header); |
| 979 | btrfs_set_free_space_entries(leaf, header, entries); |
| 980 | btrfs_set_free_space_bitmaps(leaf, header, bitmaps); |
| 981 | btrfs_set_free_space_generation(leaf, header, trans->transid); |
| 982 | btrfs_mark_buffer_dirty(leaf); |
| 983 | btrfs_release_path(path); |
| 984 | |
| 985 | return 0; |
| 986 | |
| 987 | fail: |
| 988 | return -1; |
| 989 | } |
| 990 | |
| 991 | static noinline_for_stack int |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 992 | write_pinned_extent_entries(struct btrfs_root *root, |
| 993 | struct btrfs_block_group_cache *block_group, |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 994 | struct btrfs_io_ctl *io_ctl, |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 995 | int *entries) |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 996 | { |
| 997 | u64 start, extent_start, extent_end, len; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 998 | struct extent_io_tree *unpin = NULL; |
| 999 | int ret; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1000 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1001 | if (!block_group) |
| 1002 | return 0; |
| 1003 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1004 | /* |
| 1005 | * We want to add any pinned extents to our free space cache |
| 1006 | * so we don't leak the space |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1007 | * |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1008 | * We shouldn't have switched the pinned extents yet so this is the |
| 1009 | * right one |
| 1010 | */ |
| 1011 | unpin = root->fs_info->pinned_extents; |
| 1012 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1013 | start = block_group->key.objectid; |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1014 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1015 | while (start < block_group->key.objectid + block_group->key.offset) { |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1016 | ret = find_first_extent_bit(unpin, start, |
| 1017 | &extent_start, &extent_end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 1018 | EXTENT_DIRTY, NULL); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1019 | if (ret) |
| 1020 | return 0; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 1021 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1022 | /* This pinned extent is out of our range */ |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1023 | if (extent_start >= block_group->key.objectid + |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1024 | block_group->key.offset) |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1025 | return 0; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1026 | |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1027 | extent_start = max(extent_start, start); |
| 1028 | extent_end = min(block_group->key.objectid + |
| 1029 | block_group->key.offset, extent_end + 1); |
| 1030 | len = extent_end - extent_start; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1031 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1032 | *entries += 1; |
| 1033 | ret = io_ctl_add_entry(io_ctl, extent_start, len, NULL); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1034 | if (ret) |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1035 | return -ENOSPC; |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 1036 | |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1037 | start = extent_end; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1038 | } |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1039 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1040 | return 0; |
| 1041 | } |
| 1042 | |
| 1043 | static noinline_for_stack int |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 1044 | write_bitmap_entries(struct btrfs_io_ctl *io_ctl, struct list_head *bitmap_list) |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1045 | { |
| 1046 | struct list_head *pos, *n; |
| 1047 | int ret; |
| 1048 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1049 | /* Write out the bitmaps */ |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1050 | list_for_each_safe(pos, n, bitmap_list) { |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1051 | struct btrfs_free_space *entry = |
| 1052 | list_entry(pos, struct btrfs_free_space, list); |
| 1053 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1054 | ret = io_ctl_add_bitmap(io_ctl, entry->bitmap); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1055 | if (ret) |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1056 | return -ENOSPC; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1057 | list_del_init(&entry->list); |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 1058 | } |
| 1059 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1060 | return 0; |
| 1061 | } |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1062 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1063 | static int flush_dirty_cache(struct inode *inode) |
| 1064 | { |
| 1065 | int ret; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 1066 | |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 1067 | ret = btrfs_wait_ordered_range(inode, 0, (u64)-1); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1068 | if (ret) |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 1069 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1, |
| 1070 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL, |
| 1071 | GFP_NOFS); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1072 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1073 | return ret; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1074 | } |
| 1075 | |
| 1076 | static void noinline_for_stack |
| 1077 | cleanup_write_cache_enospc(struct inode *inode, |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 1078 | struct btrfs_io_ctl *io_ctl, |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1079 | struct extent_state **cached_state, |
| 1080 | struct list_head *bitmap_list) |
| 1081 | { |
| 1082 | struct list_head *pos, *n; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1083 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1084 | list_for_each_safe(pos, n, bitmap_list) { |
| 1085 | struct btrfs_free_space *entry = |
| 1086 | list_entry(pos, struct btrfs_free_space, list); |
| 1087 | list_del_init(&entry->list); |
| 1088 | } |
| 1089 | io_ctl_drop_pages(io_ctl); |
| 1090 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, |
| 1091 | i_size_read(inode) - 1, cached_state, |
| 1092 | GFP_NOFS); |
| 1093 | } |
| 1094 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1095 | int btrfs_wait_cache_io(struct btrfs_root *root, |
| 1096 | struct btrfs_trans_handle *trans, |
| 1097 | struct btrfs_block_group_cache *block_group, |
| 1098 | struct btrfs_io_ctl *io_ctl, |
| 1099 | struct btrfs_path *path, u64 offset) |
| 1100 | { |
| 1101 | int ret; |
| 1102 | struct inode *inode = io_ctl->inode; |
| 1103 | |
| 1104 | root = root->fs_info->tree_root; |
| 1105 | |
| 1106 | /* Flush the dirty pages in the cache file. */ |
| 1107 | ret = flush_dirty_cache(inode); |
| 1108 | if (ret) |
| 1109 | goto out; |
| 1110 | |
| 1111 | /* Update the cache item to tell everyone this cache file is valid. */ |
| 1112 | ret = update_cache_item(trans, root, inode, path, offset, |
| 1113 | io_ctl->entries, io_ctl->bitmaps); |
| 1114 | out: |
| 1115 | io_ctl_free(io_ctl); |
| 1116 | if (ret) { |
| 1117 | invalidate_inode_pages2(inode->i_mapping); |
| 1118 | BTRFS_I(inode)->generation = 0; |
| 1119 | if (block_group) { |
| 1120 | #ifdef DEBUG |
| 1121 | btrfs_err(root->fs_info, |
| 1122 | "failed to write free space cache for block group %llu", |
| 1123 | block_group->key.objectid); |
| 1124 | #endif |
| 1125 | } |
| 1126 | } |
| 1127 | btrfs_update_inode(trans, root, inode); |
| 1128 | |
| 1129 | if (block_group) { |
| 1130 | spin_lock(&block_group->lock); |
| 1131 | |
| 1132 | /* |
| 1133 | * only mark this as written if we didn't get put back on |
| 1134 | * the dirty list while waiting for IO. |
| 1135 | */ |
| 1136 | if (!ret && list_empty(&block_group->dirty_list)) |
| 1137 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; |
| 1138 | else if (ret) |
| 1139 | block_group->disk_cache_state = BTRFS_DC_ERROR; |
| 1140 | |
| 1141 | spin_unlock(&block_group->lock); |
| 1142 | io_ctl->inode = NULL; |
| 1143 | iput(inode); |
| 1144 | } |
| 1145 | |
| 1146 | return ret; |
| 1147 | |
| 1148 | } |
| 1149 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1150 | /** |
| 1151 | * __btrfs_write_out_cache - write out cached info to an inode |
| 1152 | * @root - the root the inode belongs to |
| 1153 | * @ctl - the free space cache we are going to write out |
| 1154 | * @block_group - the block_group for this cache if it belongs to a block_group |
| 1155 | * @trans - the trans handle |
| 1156 | * @path - the path to use |
| 1157 | * @offset - the offset for the key we'll insert |
| 1158 | * |
| 1159 | * This function writes out a free space cache struct to disk for quick recovery |
| 1160 | * on mount. This will return 0 if it was successfull in writing the cache out, |
| 1161 | * and -1 if it was not. |
| 1162 | */ |
| 1163 | static int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, |
| 1164 | struct btrfs_free_space_ctl *ctl, |
| 1165 | struct btrfs_block_group_cache *block_group, |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1166 | struct btrfs_io_ctl *io_ctl, |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1167 | struct btrfs_trans_handle *trans, |
| 1168 | struct btrfs_path *path, u64 offset) |
| 1169 | { |
| 1170 | struct extent_state *cached_state = NULL; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1171 | LIST_HEAD(bitmap_list); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1172 | int entries = 0; |
| 1173 | int bitmaps = 0; |
| 1174 | int ret; |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1175 | int must_iput = 0; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1176 | |
| 1177 | if (!i_size_read(inode)) |
| 1178 | return -1; |
| 1179 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1180 | WARN_ON(io_ctl->pages); |
| 1181 | ret = io_ctl_init(io_ctl, inode, root, 1); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1182 | if (ret) |
| 1183 | return -1; |
| 1184 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1185 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) { |
| 1186 | down_write(&block_group->data_rwsem); |
| 1187 | spin_lock(&block_group->lock); |
| 1188 | if (block_group->delalloc_bytes) { |
| 1189 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; |
| 1190 | spin_unlock(&block_group->lock); |
| 1191 | up_write(&block_group->data_rwsem); |
| 1192 | BTRFS_I(inode)->generation = 0; |
| 1193 | ret = 0; |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1194 | must_iput = 1; |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1195 | goto out; |
| 1196 | } |
| 1197 | spin_unlock(&block_group->lock); |
| 1198 | } |
| 1199 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1200 | /* Lock all pages first so we can lock the extent safely. */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1201 | io_ctl_prepare_pages(io_ctl, inode, 0); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1202 | |
| 1203 | lock_extent_bits(&BTRFS_I(inode)->io_tree, 0, i_size_read(inode) - 1, |
| 1204 | 0, &cached_state); |
| 1205 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1206 | io_ctl_set_generation(io_ctl, trans->transid); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1207 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1208 | mutex_lock(&ctl->cache_writeout_mutex); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1209 | /* Write out the extent entries in the free space cache */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1210 | ret = write_cache_extent_entries(io_ctl, ctl, |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1211 | block_group, &entries, &bitmaps, |
| 1212 | &bitmap_list); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1213 | if (ret) { |
| 1214 | mutex_unlock(&ctl->cache_writeout_mutex); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1215 | goto out_nospc; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1216 | } |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1217 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1218 | /* |
| 1219 | * Some spaces that are freed in the current transaction are pinned, |
| 1220 | * they will be added into free space cache after the transaction is |
| 1221 | * committed, we shouldn't lose them. |
| 1222 | */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1223 | ret = write_pinned_extent_entries(root, block_group, io_ctl, &entries); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1224 | if (ret) { |
| 1225 | mutex_unlock(&ctl->cache_writeout_mutex); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1226 | goto out_nospc; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1227 | } |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1228 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1229 | /* |
| 1230 | * At last, we write out all the bitmaps and keep cache_writeout_mutex |
| 1231 | * locked while doing it because a concurrent trim can be manipulating |
| 1232 | * or freeing the bitmap. |
| 1233 | */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1234 | ret = write_bitmap_entries(io_ctl, &bitmap_list); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1235 | mutex_unlock(&ctl->cache_writeout_mutex); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1236 | if (ret) |
| 1237 | goto out_nospc; |
| 1238 | |
| 1239 | /* Zero out the rest of the pages just to make sure */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1240 | io_ctl_zero_remaining_pages(io_ctl); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1241 | |
| 1242 | /* Everything is written out, now we dirty the pages in the file. */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1243 | ret = btrfs_dirty_pages(root, inode, io_ctl->pages, io_ctl->num_pages, |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1244 | 0, i_size_read(inode), &cached_state); |
| 1245 | if (ret) |
| 1246 | goto out_nospc; |
| 1247 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1248 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) |
| 1249 | up_write(&block_group->data_rwsem); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1250 | /* |
| 1251 | * Release the pages and unlock the extent, we will flush |
| 1252 | * them out later |
| 1253 | */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1254 | io_ctl_drop_pages(io_ctl); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1255 | |
| 1256 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, |
| 1257 | i_size_read(inode) - 1, &cached_state, GFP_NOFS); |
| 1258 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1259 | /* |
| 1260 | * at this point the pages are under IO and we're happy, |
| 1261 | * The caller is responsible for waiting on them and updating the |
| 1262 | * the cache and the inode |
| 1263 | */ |
| 1264 | io_ctl->entries = entries; |
| 1265 | io_ctl->bitmaps = bitmaps; |
| 1266 | |
| 1267 | ret = btrfs_fdatawrite_range(inode, 0, (u64)-1); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1268 | if (ret) |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 1269 | goto out; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1270 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1271 | return 0; |
| 1272 | |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 1273 | out: |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1274 | io_ctl->inode = NULL; |
| 1275 | io_ctl_free(io_ctl); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1276 | if (ret) { |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1277 | invalidate_inode_pages2(inode->i_mapping); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1278 | BTRFS_I(inode)->generation = 0; |
| 1279 | } |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1280 | btrfs_update_inode(trans, root, inode); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1281 | if (must_iput) |
| 1282 | iput(inode); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1283 | return ret; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1284 | |
| 1285 | out_nospc: |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1286 | cleanup_write_cache_enospc(inode, io_ctl, &cached_state, &bitmap_list); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1287 | |
| 1288 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) |
| 1289 | up_write(&block_group->data_rwsem); |
| 1290 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1291 | goto out; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1292 | } |
| 1293 | |
| 1294 | int btrfs_write_out_cache(struct btrfs_root *root, |
| 1295 | struct btrfs_trans_handle *trans, |
| 1296 | struct btrfs_block_group_cache *block_group, |
| 1297 | struct btrfs_path *path) |
| 1298 | { |
| 1299 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
| 1300 | struct inode *inode; |
| 1301 | int ret = 0; |
| 1302 | |
| 1303 | root = root->fs_info->tree_root; |
| 1304 | |
| 1305 | spin_lock(&block_group->lock); |
| 1306 | if (block_group->disk_cache_state < BTRFS_DC_SETUP) { |
| 1307 | spin_unlock(&block_group->lock); |
| 1308 | return 0; |
| 1309 | } |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1310 | |
| 1311 | if (block_group->delalloc_bytes) { |
| 1312 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; |
| 1313 | spin_unlock(&block_group->lock); |
| 1314 | return 0; |
| 1315 | } |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1316 | spin_unlock(&block_group->lock); |
| 1317 | |
| 1318 | inode = lookup_free_space_inode(root, block_group, path); |
| 1319 | if (IS_ERR(inode)) |
| 1320 | return 0; |
| 1321 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1322 | ret = __btrfs_write_out_cache(root, inode, ctl, block_group, |
| 1323 | &block_group->io_ctl, trans, |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1324 | path, block_group->key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1325 | if (ret) { |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1326 | #ifdef DEBUG |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 1327 | btrfs_err(root->fs_info, |
| 1328 | "failed to write free space cache for block group %llu", |
| 1329 | block_group->key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1330 | #endif |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1331 | spin_lock(&block_group->lock); |
| 1332 | block_group->disk_cache_state = BTRFS_DC_ERROR; |
| 1333 | spin_unlock(&block_group->lock); |
| 1334 | |
| 1335 | block_group->io_ctl.inode = NULL; |
| 1336 | iput(inode); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1337 | } |
| 1338 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1339 | /* |
| 1340 | * if ret == 0 the caller is expected to call btrfs_wait_cache_io |
| 1341 | * to wait for IO and put the inode |
| 1342 | */ |
| 1343 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1344 | return ret; |
| 1345 | } |
| 1346 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1347 | static inline unsigned long offset_to_bit(u64 bitmap_start, u32 unit, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1348 | u64 offset) |
| 1349 | { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1350 | ASSERT(offset >= bitmap_start); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1351 | offset -= bitmap_start; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1352 | return (unsigned long)(div_u64(offset, unit)); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1353 | } |
| 1354 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1355 | static inline unsigned long bytes_to_bits(u64 bytes, u32 unit) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1356 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1357 | return (unsigned long)(div_u64(bytes, unit)); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1358 | } |
| 1359 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1360 | static inline u64 offset_to_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1361 | u64 offset) |
| 1362 | { |
| 1363 | u64 bitmap_start; |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1364 | u32 bytes_per_bitmap; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1365 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1366 | bytes_per_bitmap = BITS_PER_BITMAP * ctl->unit; |
| 1367 | bitmap_start = offset - ctl->start; |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1368 | bitmap_start = div_u64(bitmap_start, bytes_per_bitmap); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1369 | bitmap_start *= bytes_per_bitmap; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1370 | bitmap_start += ctl->start; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1371 | |
| 1372 | return bitmap_start; |
| 1373 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1374 | |
| 1375 | static int tree_insert_offset(struct rb_root *root, u64 offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1376 | struct rb_node *node, int bitmap) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1377 | { |
| 1378 | struct rb_node **p = &root->rb_node; |
| 1379 | struct rb_node *parent = NULL; |
| 1380 | struct btrfs_free_space *info; |
| 1381 | |
| 1382 | while (*p) { |
| 1383 | parent = *p; |
| 1384 | info = rb_entry(parent, struct btrfs_free_space, offset_index); |
| 1385 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1386 | if (offset < info->offset) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1387 | p = &(*p)->rb_left; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1388 | } else if (offset > info->offset) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1389 | p = &(*p)->rb_right; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1390 | } else { |
| 1391 | /* |
| 1392 | * we could have a bitmap entry and an extent entry |
| 1393 | * share the same offset. If this is the case, we want |
| 1394 | * the extent entry to always be found first if we do a |
| 1395 | * linear search through the tree, since we want to have |
| 1396 | * the quickest allocation time, and allocating from an |
| 1397 | * extent is faster than allocating from a bitmap. So |
| 1398 | * if we're inserting a bitmap and we find an entry at |
| 1399 | * this offset, we want to go right, or after this entry |
| 1400 | * logically. If we are inserting an extent and we've |
| 1401 | * found a bitmap, we want to go left, or before |
| 1402 | * logically. |
| 1403 | */ |
| 1404 | if (bitmap) { |
Josef Bacik | 207dde8 | 2011-05-13 14:49:23 -0400 | [diff] [blame] | 1405 | if (info->bitmap) { |
| 1406 | WARN_ON_ONCE(1); |
| 1407 | return -EEXIST; |
| 1408 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1409 | p = &(*p)->rb_right; |
| 1410 | } else { |
Josef Bacik | 207dde8 | 2011-05-13 14:49:23 -0400 | [diff] [blame] | 1411 | if (!info->bitmap) { |
| 1412 | WARN_ON_ONCE(1); |
| 1413 | return -EEXIST; |
| 1414 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1415 | p = &(*p)->rb_left; |
| 1416 | } |
| 1417 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1418 | } |
| 1419 | |
| 1420 | rb_link_node(node, parent, p); |
| 1421 | rb_insert_color(node, root); |
| 1422 | |
| 1423 | return 0; |
| 1424 | } |
| 1425 | |
| 1426 | /* |
Josef Bacik | 70cb074 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 1427 | * searches the tree for the given offset. |
| 1428 | * |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1429 | * fuzzy - If this is set, then we are trying to make an allocation, and we just |
| 1430 | * want a section that has at least bytes size and comes at or after the given |
| 1431 | * offset. |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1432 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1433 | static struct btrfs_free_space * |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1434 | tree_search_offset(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1435 | u64 offset, int bitmap_only, int fuzzy) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1436 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1437 | struct rb_node *n = ctl->free_space_offset.rb_node; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1438 | struct btrfs_free_space *entry, *prev = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1439 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1440 | /* find entry that is closest to the 'offset' */ |
| 1441 | while (1) { |
| 1442 | if (!n) { |
| 1443 | entry = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1444 | break; |
| 1445 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1446 | |
| 1447 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1448 | prev = entry; |
| 1449 | |
| 1450 | if (offset < entry->offset) |
| 1451 | n = n->rb_left; |
| 1452 | else if (offset > entry->offset) |
| 1453 | n = n->rb_right; |
| 1454 | else |
| 1455 | break; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1456 | } |
| 1457 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1458 | if (bitmap_only) { |
| 1459 | if (!entry) |
| 1460 | return NULL; |
| 1461 | if (entry->bitmap) |
| 1462 | return entry; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1463 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1464 | /* |
| 1465 | * bitmap entry and extent entry may share same offset, |
| 1466 | * in that case, bitmap entry comes after extent entry. |
| 1467 | */ |
| 1468 | n = rb_next(n); |
| 1469 | if (!n) |
| 1470 | return NULL; |
| 1471 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1472 | if (entry->offset != offset) |
| 1473 | return NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1474 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1475 | WARN_ON(!entry->bitmap); |
| 1476 | return entry; |
| 1477 | } else if (entry) { |
| 1478 | if (entry->bitmap) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1479 | /* |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1480 | * if previous extent entry covers the offset, |
| 1481 | * we should return it instead of the bitmap entry |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1482 | */ |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1483 | n = rb_prev(&entry->offset_index); |
| 1484 | if (n) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1485 | prev = rb_entry(n, struct btrfs_free_space, |
| 1486 | offset_index); |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1487 | if (!prev->bitmap && |
| 1488 | prev->offset + prev->bytes > offset) |
| 1489 | entry = prev; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1490 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1491 | } |
| 1492 | return entry; |
| 1493 | } |
| 1494 | |
| 1495 | if (!prev) |
| 1496 | return NULL; |
| 1497 | |
| 1498 | /* find last entry before the 'offset' */ |
| 1499 | entry = prev; |
| 1500 | if (entry->offset > offset) { |
| 1501 | n = rb_prev(&entry->offset_index); |
| 1502 | if (n) { |
| 1503 | entry = rb_entry(n, struct btrfs_free_space, |
| 1504 | offset_index); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1505 | ASSERT(entry->offset <= offset); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1506 | } else { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1507 | if (fuzzy) |
| 1508 | return entry; |
| 1509 | else |
| 1510 | return NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1511 | } |
| 1512 | } |
| 1513 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1514 | if (entry->bitmap) { |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1515 | n = rb_prev(&entry->offset_index); |
| 1516 | if (n) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1517 | prev = rb_entry(n, struct btrfs_free_space, |
| 1518 | offset_index); |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1519 | if (!prev->bitmap && |
| 1520 | prev->offset + prev->bytes > offset) |
| 1521 | return prev; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1522 | } |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1523 | if (entry->offset + BITS_PER_BITMAP * ctl->unit > offset) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1524 | return entry; |
| 1525 | } else if (entry->offset + entry->bytes > offset) |
| 1526 | return entry; |
| 1527 | |
| 1528 | if (!fuzzy) |
| 1529 | return NULL; |
| 1530 | |
| 1531 | while (1) { |
| 1532 | if (entry->bitmap) { |
| 1533 | if (entry->offset + BITS_PER_BITMAP * |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1534 | ctl->unit > offset) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1535 | break; |
| 1536 | } else { |
| 1537 | if (entry->offset + entry->bytes > offset) |
| 1538 | break; |
| 1539 | } |
| 1540 | |
| 1541 | n = rb_next(&entry->offset_index); |
| 1542 | if (!n) |
| 1543 | return NULL; |
| 1544 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1545 | } |
| 1546 | return entry; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1547 | } |
| 1548 | |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1549 | static inline void |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1550 | __unlink_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1551 | struct btrfs_free_space *info) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1552 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1553 | rb_erase(&info->offset_index, &ctl->free_space_offset); |
| 1554 | ctl->free_extents--; |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1555 | } |
| 1556 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1557 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1558 | struct btrfs_free_space *info) |
| 1559 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1560 | __unlink_free_space(ctl, info); |
| 1561 | ctl->free_space -= info->bytes; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1562 | } |
| 1563 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1564 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1565 | struct btrfs_free_space *info) |
| 1566 | { |
| 1567 | int ret = 0; |
| 1568 | |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1569 | ASSERT(info->bytes || info->bitmap); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1570 | ret = tree_insert_offset(&ctl->free_space_offset, info->offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1571 | &info->offset_index, (info->bitmap != NULL)); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1572 | if (ret) |
| 1573 | return ret; |
| 1574 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1575 | ctl->free_space += info->bytes; |
| 1576 | ctl->free_extents++; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1577 | return ret; |
| 1578 | } |
| 1579 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1580 | static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1581 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1582 | struct btrfs_block_group_cache *block_group = ctl->private; |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1583 | u64 max_bytes; |
| 1584 | u64 bitmap_bytes; |
| 1585 | u64 extent_bytes; |
Li Zefan | 8eb2d82 | 2010-11-09 14:48:01 +0800 | [diff] [blame] | 1586 | u64 size = block_group->key.offset; |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1587 | u32 bytes_per_bg = BITS_PER_BITMAP * ctl->unit; |
| 1588 | 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] | 1589 | |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1590 | max_bitmaps = max_t(u32, max_bitmaps, 1); |
Josef Bacik | dde5740 | 2013-02-12 14:07:51 -0500 | [diff] [blame] | 1591 | |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1592 | ASSERT(ctl->total_bitmaps <= max_bitmaps); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1593 | |
| 1594 | /* |
| 1595 | * The goal is to keep the total amount of memory used per 1gb of space |
| 1596 | * at or below 32k, so we need to adjust how much memory we allow to be |
| 1597 | * used by extent based free space tracking |
| 1598 | */ |
Li Zefan | 8eb2d82 | 2010-11-09 14:48:01 +0800 | [diff] [blame] | 1599 | if (size < 1024 * 1024 * 1024) |
| 1600 | max_bytes = MAX_CACHE_BYTES_PER_GIG; |
| 1601 | else |
| 1602 | max_bytes = MAX_CACHE_BYTES_PER_GIG * |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1603 | div_u64(size, 1024 * 1024 * 1024); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1604 | |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1605 | /* |
| 1606 | * we want to account for 1 more bitmap than what we have so we can make |
| 1607 | * sure we don't go over our overall goal of MAX_CACHE_BYTES_PER_GIG as |
| 1608 | * we add more bitmaps. |
| 1609 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1610 | bitmap_bytes = (ctl->total_bitmaps + 1) * PAGE_CACHE_SIZE; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1611 | |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1612 | if (bitmap_bytes >= max_bytes) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1613 | ctl->extents_thresh = 0; |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1614 | return; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1615 | } |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1616 | |
| 1617 | /* |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1618 | * 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] | 1619 | * bytes we can have, or whatever is less than that. |
| 1620 | */ |
| 1621 | extent_bytes = max_bytes - bitmap_bytes; |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1622 | extent_bytes = min_t(u64, extent_bytes, max_bytes >> 1); |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1623 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1624 | ctl->extents_thresh = |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1625 | div_u64(extent_bytes, sizeof(struct btrfs_free_space)); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1626 | } |
| 1627 | |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 1628 | static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
| 1629 | struct btrfs_free_space *info, |
| 1630 | u64 offset, u64 bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1631 | { |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1632 | unsigned long start, count; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1633 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1634 | start = offset_to_bit(info->offset, ctl->unit, offset); |
| 1635 | count = bytes_to_bits(bytes, ctl->unit); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1636 | ASSERT(start + count <= BITS_PER_BITMAP); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1637 | |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1638 | bitmap_clear(info->bitmap, start, count); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1639 | |
| 1640 | info->bytes -= bytes; |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 1641 | } |
| 1642 | |
| 1643 | static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
| 1644 | struct btrfs_free_space *info, u64 offset, |
| 1645 | u64 bytes) |
| 1646 | { |
| 1647 | __bitmap_clear_bits(ctl, info, offset, bytes); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1648 | ctl->free_space -= bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1649 | } |
| 1650 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1651 | static void bitmap_set_bits(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1652 | struct btrfs_free_space *info, u64 offset, |
| 1653 | u64 bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1654 | { |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1655 | unsigned long start, count; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1656 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1657 | start = offset_to_bit(info->offset, ctl->unit, offset); |
| 1658 | count = bytes_to_bits(bytes, ctl->unit); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1659 | ASSERT(start + count <= BITS_PER_BITMAP); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1660 | |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1661 | bitmap_set(info->bitmap, start, count); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1662 | |
| 1663 | info->bytes += bytes; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1664 | ctl->free_space += bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1665 | } |
| 1666 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1667 | /* |
| 1668 | * If we can not find suitable extent, we will use bytes to record |
| 1669 | * the size of the max extent. |
| 1670 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1671 | static int search_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1672 | struct btrfs_free_space *bitmap_info, u64 *offset, |
| 1673 | u64 *bytes) |
| 1674 | { |
| 1675 | unsigned long found_bits = 0; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1676 | unsigned long max_bits = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1677 | unsigned long bits, i; |
| 1678 | unsigned long next_zero; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1679 | unsigned long extent_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1680 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1681 | i = offset_to_bit(bitmap_info->offset, ctl->unit, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1682 | max_t(u64, *offset, bitmap_info->offset)); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1683 | bits = bytes_to_bits(*bytes, ctl->unit); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1684 | |
Wei Yongjun | ebb3dad | 2012-09-13 20:29:02 -0600 | [diff] [blame] | 1685 | for_each_set_bit_from(i, bitmap_info->bitmap, BITS_PER_BITMAP) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1686 | next_zero = find_next_zero_bit(bitmap_info->bitmap, |
| 1687 | BITS_PER_BITMAP, i); |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1688 | extent_bits = next_zero - i; |
| 1689 | if (extent_bits >= bits) { |
| 1690 | found_bits = extent_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1691 | break; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1692 | } else if (extent_bits > max_bits) { |
| 1693 | max_bits = extent_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1694 | } |
| 1695 | i = next_zero; |
| 1696 | } |
| 1697 | |
| 1698 | if (found_bits) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1699 | *offset = (u64)(i * ctl->unit) + bitmap_info->offset; |
| 1700 | *bytes = (u64)(found_bits) * ctl->unit; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1701 | return 0; |
| 1702 | } |
| 1703 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1704 | *bytes = (u64)(max_bits) * ctl->unit; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1705 | return -1; |
| 1706 | } |
| 1707 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1708 | /* Cache the size of the max extent in bytes */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1709 | static struct btrfs_free_space * |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1710 | 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] | 1711 | unsigned long align, u64 *max_extent_size) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1712 | { |
| 1713 | struct btrfs_free_space *entry; |
| 1714 | struct rb_node *node; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1715 | u64 tmp; |
| 1716 | u64 align_off; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1717 | int ret; |
| 1718 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1719 | if (!ctl->free_space_offset.rb_node) |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1720 | goto out; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1721 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1722 | entry = tree_search_offset(ctl, offset_to_bitmap(ctl, *offset), 0, 1); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1723 | if (!entry) |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1724 | goto out; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1725 | |
| 1726 | for (node = &entry->offset_index; node; node = rb_next(node)) { |
| 1727 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1728 | if (entry->bytes < *bytes) { |
| 1729 | if (entry->bytes > *max_extent_size) |
| 1730 | *max_extent_size = entry->bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1731 | continue; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1732 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1733 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1734 | /* make sure the space returned is big enough |
| 1735 | * to match our requested alignment |
| 1736 | */ |
| 1737 | if (*bytes >= align) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1738 | tmp = entry->offset - ctl->start + align - 1; |
David Sterba | 47c5713 | 2015-02-20 18:43:47 +0100 | [diff] [blame] | 1739 | tmp = div64_u64(tmp, align); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1740 | tmp = tmp * align + ctl->start; |
| 1741 | align_off = tmp - entry->offset; |
| 1742 | } else { |
| 1743 | align_off = 0; |
| 1744 | tmp = entry->offset; |
| 1745 | } |
| 1746 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1747 | if (entry->bytes < *bytes + align_off) { |
| 1748 | if (entry->bytes > *max_extent_size) |
| 1749 | *max_extent_size = entry->bytes; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1750 | continue; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1751 | } |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1752 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1753 | if (entry->bitmap) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1754 | u64 size = *bytes; |
| 1755 | |
| 1756 | ret = search_bitmap(ctl, entry, &tmp, &size); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1757 | if (!ret) { |
| 1758 | *offset = tmp; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1759 | *bytes = size; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1760 | return entry; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1761 | } else if (size > *max_extent_size) { |
| 1762 | *max_extent_size = size; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1763 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1764 | continue; |
| 1765 | } |
| 1766 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1767 | *offset = tmp; |
| 1768 | *bytes = entry->bytes - align_off; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1769 | return entry; |
| 1770 | } |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1771 | out: |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1772 | return NULL; |
| 1773 | } |
| 1774 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1775 | static void add_new_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1776 | struct btrfs_free_space *info, u64 offset) |
| 1777 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1778 | info->offset = offset_to_bitmap(ctl, offset); |
Josef Bacik | f019f42 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1779 | info->bytes = 0; |
Alexandre Oliva | f2d0f67 | 2011-11-28 12:04:43 -0200 | [diff] [blame] | 1780 | INIT_LIST_HEAD(&info->list); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1781 | link_free_space(ctl, info); |
| 1782 | ctl->total_bitmaps++; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1783 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1784 | ctl->op->recalc_thresholds(ctl); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1785 | } |
| 1786 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1787 | static void free_bitmap(struct btrfs_free_space_ctl *ctl, |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1788 | struct btrfs_free_space *bitmap_info) |
| 1789 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1790 | unlink_free_space(ctl, bitmap_info); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1791 | kfree(bitmap_info->bitmap); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1792 | kmem_cache_free(btrfs_free_space_cachep, bitmap_info); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1793 | ctl->total_bitmaps--; |
| 1794 | ctl->op->recalc_thresholds(ctl); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1795 | } |
| 1796 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1797 | static noinline int remove_from_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1798 | struct btrfs_free_space *bitmap_info, |
| 1799 | u64 *offset, u64 *bytes) |
| 1800 | { |
| 1801 | u64 end; |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1802 | u64 search_start, search_bytes; |
| 1803 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1804 | |
| 1805 | again: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1806 | end = bitmap_info->offset + (u64)(BITS_PER_BITMAP * ctl->unit) - 1; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1807 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1808 | /* |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1809 | * We need to search for bits in this bitmap. We could only cover some |
| 1810 | * of the extent in this bitmap thanks to how we add space, so we need |
| 1811 | * to search for as much as it as we can and clear that amount, and then |
| 1812 | * go searching for the next bit. |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1813 | */ |
| 1814 | search_start = *offset; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1815 | search_bytes = ctl->unit; |
Josef Bacik | 13dbc08 | 2011-02-03 02:39:52 +0000 | [diff] [blame] | 1816 | search_bytes = min(search_bytes, end - search_start + 1); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1817 | ret = search_bitmap(ctl, bitmap_info, &search_start, &search_bytes); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 1818 | if (ret < 0 || search_start != *offset) |
| 1819 | return -EINVAL; |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1820 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1821 | /* We may have found more bits than what we need */ |
| 1822 | search_bytes = min(search_bytes, *bytes); |
| 1823 | |
| 1824 | /* Cannot clear past the end of the bitmap */ |
| 1825 | search_bytes = min(search_bytes, end - search_start + 1); |
| 1826 | |
| 1827 | bitmap_clear_bits(ctl, bitmap_info, search_start, search_bytes); |
| 1828 | *offset += search_bytes; |
| 1829 | *bytes -= search_bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1830 | |
| 1831 | if (*bytes) { |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1832 | struct rb_node *next = rb_next(&bitmap_info->offset_index); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1833 | if (!bitmap_info->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1834 | free_bitmap(ctl, bitmap_info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1835 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1836 | /* |
| 1837 | * no entry after this bitmap, but we still have bytes to |
| 1838 | * remove, so something has gone wrong. |
| 1839 | */ |
| 1840 | if (!next) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1841 | return -EINVAL; |
| 1842 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1843 | bitmap_info = rb_entry(next, struct btrfs_free_space, |
| 1844 | offset_index); |
| 1845 | |
| 1846 | /* |
| 1847 | * if the next entry isn't a bitmap we need to return to let the |
| 1848 | * extent stuff do its work. |
| 1849 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1850 | if (!bitmap_info->bitmap) |
| 1851 | return -EAGAIN; |
| 1852 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1853 | /* |
| 1854 | * Ok the next item is a bitmap, but it may not actually hold |
| 1855 | * the information for the rest of this free space stuff, so |
| 1856 | * look for it, and if we don't find it return so we can try |
| 1857 | * everything over again. |
| 1858 | */ |
| 1859 | search_start = *offset; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1860 | search_bytes = ctl->unit; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1861 | ret = search_bitmap(ctl, bitmap_info, &search_start, |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1862 | &search_bytes); |
| 1863 | if (ret < 0 || search_start != *offset) |
| 1864 | return -EAGAIN; |
| 1865 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1866 | goto again; |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1867 | } else if (!bitmap_info->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1868 | free_bitmap(ctl, bitmap_info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1869 | |
| 1870 | return 0; |
| 1871 | } |
| 1872 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1873 | static u64 add_bytes_to_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1874 | struct btrfs_free_space *info, u64 offset, |
| 1875 | u64 bytes) |
| 1876 | { |
| 1877 | u64 bytes_to_set = 0; |
| 1878 | u64 end; |
| 1879 | |
| 1880 | end = info->offset + (u64)(BITS_PER_BITMAP * ctl->unit); |
| 1881 | |
| 1882 | bytes_to_set = min(end - offset, bytes); |
| 1883 | |
| 1884 | bitmap_set_bits(ctl, info, offset, bytes_to_set); |
| 1885 | |
| 1886 | return bytes_to_set; |
| 1887 | |
| 1888 | } |
| 1889 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1890 | static bool use_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1891 | struct btrfs_free_space *info) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1892 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1893 | struct btrfs_block_group_cache *block_group = ctl->private; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1894 | |
| 1895 | /* |
| 1896 | * If we are below the extents threshold then we can add this as an |
| 1897 | * extent, and don't have to deal with the bitmap |
| 1898 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1899 | if (ctl->free_extents < ctl->extents_thresh) { |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1900 | /* |
| 1901 | * If this block group has some small extents we don't want to |
| 1902 | * use up all of our free slots in the cache with them, we want |
| 1903 | * to reserve them to larger extents, however if we have plent |
| 1904 | * of cache left then go ahead an dadd them, no sense in adding |
| 1905 | * the overhead of a bitmap if we don't have to. |
| 1906 | */ |
| 1907 | if (info->bytes <= block_group->sectorsize * 4) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1908 | if (ctl->free_extents * 2 <= ctl->extents_thresh) |
| 1909 | return false; |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1910 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1911 | return false; |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1912 | } |
| 1913 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1914 | |
| 1915 | /* |
Josef Bacik | dde5740 | 2013-02-12 14:07:51 -0500 | [diff] [blame] | 1916 | * The original block groups from mkfs can be really small, like 8 |
| 1917 | * megabytes, so don't bother with a bitmap for those entries. However |
| 1918 | * some block groups can be smaller than what a bitmap would cover but |
| 1919 | * are still large enough that they could overflow the 32k memory limit, |
| 1920 | * so allow those block groups to still be allowed to have a bitmap |
| 1921 | * entry. |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1922 | */ |
Josef Bacik | dde5740 | 2013-02-12 14:07:51 -0500 | [diff] [blame] | 1923 | if (((BITS_PER_BITMAP * ctl->unit) >> 1) > block_group->key.offset) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1924 | return false; |
| 1925 | |
| 1926 | return true; |
| 1927 | } |
| 1928 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1929 | static struct btrfs_free_space_op free_space_op = { |
| 1930 | .recalc_thresholds = recalculate_thresholds, |
| 1931 | .use_bitmap = use_bitmap, |
| 1932 | }; |
| 1933 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1934 | static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1935 | struct btrfs_free_space *info) |
| 1936 | { |
| 1937 | struct btrfs_free_space *bitmap_info; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1938 | struct btrfs_block_group_cache *block_group = NULL; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1939 | int added = 0; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1940 | u64 bytes, offset, bytes_added; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1941 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1942 | |
| 1943 | bytes = info->bytes; |
| 1944 | offset = info->offset; |
| 1945 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1946 | if (!ctl->op->use_bitmap(ctl, info)) |
| 1947 | return 0; |
| 1948 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1949 | if (ctl->op == &free_space_op) |
| 1950 | block_group = ctl->private; |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1951 | again: |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1952 | /* |
| 1953 | * Since we link bitmaps right into the cluster we need to see if we |
| 1954 | * have a cluster here, and if so and it has our bitmap we need to add |
| 1955 | * the free space to that bitmap. |
| 1956 | */ |
| 1957 | if (block_group && !list_empty(&block_group->cluster_list)) { |
| 1958 | struct btrfs_free_cluster *cluster; |
| 1959 | struct rb_node *node; |
| 1960 | struct btrfs_free_space *entry; |
| 1961 | |
| 1962 | cluster = list_entry(block_group->cluster_list.next, |
| 1963 | struct btrfs_free_cluster, |
| 1964 | block_group_list); |
| 1965 | spin_lock(&cluster->lock); |
| 1966 | node = rb_first(&cluster->root); |
| 1967 | if (!node) { |
| 1968 | spin_unlock(&cluster->lock); |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1969 | goto no_cluster_bitmap; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1970 | } |
| 1971 | |
| 1972 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 1973 | if (!entry->bitmap) { |
| 1974 | spin_unlock(&cluster->lock); |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1975 | goto no_cluster_bitmap; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1976 | } |
| 1977 | |
| 1978 | if (entry->offset == offset_to_bitmap(ctl, offset)) { |
| 1979 | bytes_added = add_bytes_to_bitmap(ctl, entry, |
| 1980 | offset, bytes); |
| 1981 | bytes -= bytes_added; |
| 1982 | offset += bytes_added; |
| 1983 | } |
| 1984 | spin_unlock(&cluster->lock); |
| 1985 | if (!bytes) { |
| 1986 | ret = 1; |
| 1987 | goto out; |
| 1988 | } |
| 1989 | } |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1990 | |
| 1991 | no_cluster_bitmap: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1992 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1993 | 1, 0); |
| 1994 | if (!bitmap_info) { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1995 | ASSERT(added == 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1996 | goto new_bitmap; |
| 1997 | } |
| 1998 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1999 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
| 2000 | bytes -= bytes_added; |
| 2001 | offset += bytes_added; |
| 2002 | added = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2003 | |
| 2004 | if (!bytes) { |
| 2005 | ret = 1; |
| 2006 | goto out; |
| 2007 | } else |
| 2008 | goto again; |
| 2009 | |
| 2010 | new_bitmap: |
| 2011 | if (info && info->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2012 | add_new_bitmap(ctl, info, offset); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2013 | added = 1; |
| 2014 | info = NULL; |
| 2015 | goto again; |
| 2016 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2017 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2018 | |
| 2019 | /* no pre-allocated info, allocate a new one */ |
| 2020 | if (!info) { |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2021 | info = kmem_cache_zalloc(btrfs_free_space_cachep, |
| 2022 | GFP_NOFS); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2023 | if (!info) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2024 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2025 | ret = -ENOMEM; |
| 2026 | goto out; |
| 2027 | } |
| 2028 | } |
| 2029 | |
| 2030 | /* allocate the bitmap */ |
| 2031 | info->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2032 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2033 | if (!info->bitmap) { |
| 2034 | ret = -ENOMEM; |
| 2035 | goto out; |
| 2036 | } |
| 2037 | goto again; |
| 2038 | } |
| 2039 | |
| 2040 | out: |
| 2041 | if (info) { |
| 2042 | if (info->bitmap) |
| 2043 | kfree(info->bitmap); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2044 | kmem_cache_free(btrfs_free_space_cachep, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2045 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2046 | |
| 2047 | return ret; |
| 2048 | } |
| 2049 | |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 2050 | static bool try_merge_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2051 | struct btrfs_free_space *info, bool update_stat) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2052 | { |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2053 | struct btrfs_free_space *left_info; |
| 2054 | struct btrfs_free_space *right_info; |
| 2055 | bool merged = false; |
| 2056 | u64 offset = info->offset; |
| 2057 | u64 bytes = info->bytes; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2058 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2059 | /* |
| 2060 | * first we want to see if there is free space adjacent to the range we |
| 2061 | * are adding, if there is remove that struct and add a new one to |
| 2062 | * cover the entire range |
| 2063 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2064 | right_info = tree_search_offset(ctl, offset + bytes, 0, 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2065 | if (right_info && rb_prev(&right_info->offset_index)) |
| 2066 | left_info = rb_entry(rb_prev(&right_info->offset_index), |
| 2067 | struct btrfs_free_space, offset_index); |
| 2068 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2069 | left_info = tree_search_offset(ctl, offset - 1, 0, 0); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2070 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2071 | if (right_info && !right_info->bitmap) { |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2072 | if (update_stat) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2073 | unlink_free_space(ctl, right_info); |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2074 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2075 | __unlink_free_space(ctl, right_info); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2076 | info->bytes += right_info->bytes; |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2077 | kmem_cache_free(btrfs_free_space_cachep, right_info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2078 | merged = true; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2079 | } |
| 2080 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2081 | if (left_info && !left_info->bitmap && |
| 2082 | left_info->offset + left_info->bytes == offset) { |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2083 | if (update_stat) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2084 | unlink_free_space(ctl, left_info); |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2085 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2086 | __unlink_free_space(ctl, left_info); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2087 | info->offset = left_info->offset; |
| 2088 | info->bytes += left_info->bytes; |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2089 | kmem_cache_free(btrfs_free_space_cachep, left_info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2090 | merged = true; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2091 | } |
| 2092 | |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2093 | return merged; |
| 2094 | } |
| 2095 | |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2096 | static bool steal_from_bitmap_to_end(struct btrfs_free_space_ctl *ctl, |
| 2097 | struct btrfs_free_space *info, |
| 2098 | bool update_stat) |
| 2099 | { |
| 2100 | struct btrfs_free_space *bitmap; |
| 2101 | unsigned long i; |
| 2102 | unsigned long j; |
| 2103 | const u64 end = info->offset + info->bytes; |
| 2104 | const u64 bitmap_offset = offset_to_bitmap(ctl, end); |
| 2105 | u64 bytes; |
| 2106 | |
| 2107 | bitmap = tree_search_offset(ctl, bitmap_offset, 1, 0); |
| 2108 | if (!bitmap) |
| 2109 | return false; |
| 2110 | |
| 2111 | i = offset_to_bit(bitmap->offset, ctl->unit, end); |
| 2112 | j = find_next_zero_bit(bitmap->bitmap, BITS_PER_BITMAP, i); |
| 2113 | if (j == i) |
| 2114 | return false; |
| 2115 | bytes = (j - i) * ctl->unit; |
| 2116 | info->bytes += bytes; |
| 2117 | |
| 2118 | if (update_stat) |
| 2119 | bitmap_clear_bits(ctl, bitmap, end, bytes); |
| 2120 | else |
| 2121 | __bitmap_clear_bits(ctl, bitmap, end, bytes); |
| 2122 | |
| 2123 | if (!bitmap->bytes) |
| 2124 | free_bitmap(ctl, bitmap); |
| 2125 | |
| 2126 | return true; |
| 2127 | } |
| 2128 | |
| 2129 | static bool steal_from_bitmap_to_front(struct btrfs_free_space_ctl *ctl, |
| 2130 | struct btrfs_free_space *info, |
| 2131 | bool update_stat) |
| 2132 | { |
| 2133 | struct btrfs_free_space *bitmap; |
| 2134 | u64 bitmap_offset; |
| 2135 | unsigned long i; |
| 2136 | unsigned long j; |
| 2137 | unsigned long prev_j; |
| 2138 | u64 bytes; |
| 2139 | |
| 2140 | bitmap_offset = offset_to_bitmap(ctl, info->offset); |
| 2141 | /* If we're on a boundary, try the previous logical bitmap. */ |
| 2142 | if (bitmap_offset == info->offset) { |
| 2143 | if (info->offset == 0) |
| 2144 | return false; |
| 2145 | bitmap_offset = offset_to_bitmap(ctl, info->offset - 1); |
| 2146 | } |
| 2147 | |
| 2148 | bitmap = tree_search_offset(ctl, bitmap_offset, 1, 0); |
| 2149 | if (!bitmap) |
| 2150 | return false; |
| 2151 | |
| 2152 | i = offset_to_bit(bitmap->offset, ctl->unit, info->offset) - 1; |
| 2153 | j = 0; |
| 2154 | prev_j = (unsigned long)-1; |
| 2155 | for_each_clear_bit_from(j, bitmap->bitmap, BITS_PER_BITMAP) { |
| 2156 | if (j > i) |
| 2157 | break; |
| 2158 | prev_j = j; |
| 2159 | } |
| 2160 | if (prev_j == i) |
| 2161 | return false; |
| 2162 | |
| 2163 | if (prev_j == (unsigned long)-1) |
| 2164 | bytes = (i + 1) * ctl->unit; |
| 2165 | else |
| 2166 | bytes = (i - prev_j) * ctl->unit; |
| 2167 | |
| 2168 | info->offset -= bytes; |
| 2169 | info->bytes += bytes; |
| 2170 | |
| 2171 | if (update_stat) |
| 2172 | bitmap_clear_bits(ctl, bitmap, info->offset, bytes); |
| 2173 | else |
| 2174 | __bitmap_clear_bits(ctl, bitmap, info->offset, bytes); |
| 2175 | |
| 2176 | if (!bitmap->bytes) |
| 2177 | free_bitmap(ctl, bitmap); |
| 2178 | |
| 2179 | return true; |
| 2180 | } |
| 2181 | |
| 2182 | /* |
| 2183 | * We prefer always to allocate from extent entries, both for clustered and |
| 2184 | * non-clustered allocation requests. So when attempting to add a new extent |
| 2185 | * entry, try to see if there's adjacent free space in bitmap entries, and if |
| 2186 | * there is, migrate that space from the bitmaps to the extent. |
| 2187 | * Like this we get better chances of satisfying space allocation requests |
| 2188 | * because we attempt to satisfy them based on a single cache entry, and never |
| 2189 | * on 2 or more entries - even if the entries represent a contiguous free space |
| 2190 | * region (e.g. 1 extent entry + 1 bitmap entry starting where the extent entry |
| 2191 | * ends). |
| 2192 | */ |
| 2193 | static void steal_from_bitmap(struct btrfs_free_space_ctl *ctl, |
| 2194 | struct btrfs_free_space *info, |
| 2195 | bool update_stat) |
| 2196 | { |
| 2197 | /* |
| 2198 | * Only work with disconnected entries, as we can change their offset, |
| 2199 | * and must be extent entries. |
| 2200 | */ |
| 2201 | ASSERT(!info->bitmap); |
| 2202 | ASSERT(RB_EMPTY_NODE(&info->offset_index)); |
| 2203 | |
| 2204 | if (ctl->total_bitmaps > 0) { |
| 2205 | bool stole_end; |
| 2206 | bool stole_front = false; |
| 2207 | |
| 2208 | stole_end = steal_from_bitmap_to_end(ctl, info, update_stat); |
| 2209 | if (ctl->total_bitmaps > 0) |
| 2210 | stole_front = steal_from_bitmap_to_front(ctl, info, |
| 2211 | update_stat); |
| 2212 | |
| 2213 | if (stole_end || stole_front) |
| 2214 | try_merge_free_space(ctl, info, update_stat); |
| 2215 | } |
| 2216 | } |
| 2217 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2218 | int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl, |
| 2219 | u64 offset, u64 bytes) |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2220 | { |
| 2221 | struct btrfs_free_space *info; |
| 2222 | int ret = 0; |
| 2223 | |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2224 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2225 | if (!info) |
| 2226 | return -ENOMEM; |
| 2227 | |
| 2228 | info->offset = offset; |
| 2229 | info->bytes = bytes; |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2230 | RB_CLEAR_NODE(&info->offset_index); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2231 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2232 | spin_lock(&ctl->tree_lock); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2233 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2234 | if (try_merge_free_space(ctl, info, true)) |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2235 | goto link; |
| 2236 | |
| 2237 | /* |
| 2238 | * There was no extent directly to the left or right of this new |
| 2239 | * extent then we know we're going to have to allocate a new extent, so |
| 2240 | * before we do that see if we need to drop this into a bitmap |
| 2241 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2242 | ret = insert_into_bitmap(ctl, info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2243 | if (ret < 0) { |
| 2244 | goto out; |
| 2245 | } else if (ret) { |
| 2246 | ret = 0; |
| 2247 | goto out; |
| 2248 | } |
| 2249 | link: |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2250 | /* |
| 2251 | * Only steal free space from adjacent bitmaps if we're sure we're not |
| 2252 | * going to add the new free space to existing bitmap entries - because |
| 2253 | * that would mean unnecessary work that would be reverted. Therefore |
| 2254 | * attempt to steal space from bitmaps if we're adding an extent entry. |
| 2255 | */ |
| 2256 | steal_from_bitmap(ctl, info, true); |
| 2257 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2258 | ret = link_free_space(ctl, info); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2259 | if (ret) |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2260 | kmem_cache_free(btrfs_free_space_cachep, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2261 | out: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2262 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2263 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2264 | if (ret) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2265 | printk(KERN_CRIT "BTRFS: unable to add free space :%d\n", ret); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 2266 | ASSERT(ret != -EEXIST); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2267 | } |
| 2268 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2269 | return ret; |
| 2270 | } |
| 2271 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2272 | int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, |
| 2273 | u64 offset, u64 bytes) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2274 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2275 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2276 | struct btrfs_free_space *info; |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2277 | int ret; |
| 2278 | bool re_search = false; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2279 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2280 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2281 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2282 | again: |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2283 | ret = 0; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2284 | if (!bytes) |
| 2285 | goto out_lock; |
| 2286 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2287 | info = tree_search_offset(ctl, offset, 0, 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2288 | if (!info) { |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 2289 | /* |
| 2290 | * oops didn't find an extent that matched the space we wanted |
| 2291 | * to remove, look for a bitmap instead |
| 2292 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2293 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 2294 | 1, 0); |
| 2295 | if (!info) { |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2296 | /* |
| 2297 | * If we found a partial bit of our free space in a |
| 2298 | * bitmap but then couldn't find the other part this may |
| 2299 | * be a problem, so WARN about it. |
Chris Mason | 24a7031 | 2011-11-21 09:39:11 -0500 | [diff] [blame] | 2300 | */ |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2301 | WARN_ON(re_search); |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 2302 | goto out_lock; |
| 2303 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2304 | } |
| 2305 | |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2306 | re_search = false; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2307 | if (!info->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2308 | unlink_free_space(ctl, info); |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2309 | if (offset == info->offset) { |
| 2310 | u64 to_free = min(bytes, info->bytes); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2311 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2312 | info->bytes -= to_free; |
| 2313 | info->offset += to_free; |
| 2314 | if (info->bytes) { |
| 2315 | ret = link_free_space(ctl, info); |
| 2316 | WARN_ON(ret); |
| 2317 | } else { |
| 2318 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 2319 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2320 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2321 | offset += to_free; |
| 2322 | bytes -= to_free; |
| 2323 | goto again; |
| 2324 | } else { |
| 2325 | u64 old_end = info->bytes + info->offset; |
Chris Mason | 9b49c9b | 2008-09-24 11:23:25 -0400 | [diff] [blame] | 2326 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2327 | info->bytes = offset - info->offset; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2328 | ret = link_free_space(ctl, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2329 | WARN_ON(ret); |
| 2330 | if (ret) |
| 2331 | goto out_lock; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2332 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2333 | /* Not enough bytes in this entry to satisfy us */ |
| 2334 | if (old_end < offset + bytes) { |
| 2335 | bytes -= old_end - offset; |
| 2336 | offset = old_end; |
| 2337 | goto again; |
| 2338 | } else if (old_end == offset + bytes) { |
| 2339 | /* all done */ |
| 2340 | goto out_lock; |
| 2341 | } |
| 2342 | spin_unlock(&ctl->tree_lock); |
| 2343 | |
| 2344 | ret = btrfs_add_free_space(block_group, offset + bytes, |
| 2345 | old_end - (offset + bytes)); |
| 2346 | WARN_ON(ret); |
| 2347 | goto out; |
| 2348 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2349 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2350 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2351 | ret = remove_from_bitmap(ctl, info, &offset, &bytes); |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2352 | if (ret == -EAGAIN) { |
| 2353 | re_search = true; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2354 | goto again; |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2355 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2356 | out_lock: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2357 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2358 | out: |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2359 | return ret; |
| 2360 | } |
| 2361 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2362 | void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, |
| 2363 | u64 bytes) |
| 2364 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2365 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2366 | struct btrfs_free_space *info; |
| 2367 | struct rb_node *n; |
| 2368 | int count = 0; |
| 2369 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2370 | 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] | 2371 | info = rb_entry(n, struct btrfs_free_space, offset_index); |
Liu Bo | f6175ef | 2012-07-06 03:31:36 -0600 | [diff] [blame] | 2372 | if (info->bytes >= bytes && !block_group->ro) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2373 | count++; |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2374 | btrfs_crit(block_group->fs_info, |
| 2375 | "entry offset %llu, bytes %llu, bitmap %s", |
| 2376 | info->offset, info->bytes, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2377 | (info->bitmap) ? "yes" : "no"); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2378 | } |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2379 | btrfs_info(block_group->fs_info, "block group has cluster?: %s", |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2380 | list_empty(&block_group->cluster_list) ? "no" : "yes"); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2381 | btrfs_info(block_group->fs_info, |
| 2382 | "%d blocks of free space at or bigger than bytes is", count); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2383 | } |
| 2384 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2385 | 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] | 2386 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2387 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2388 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2389 | spin_lock_init(&ctl->tree_lock); |
| 2390 | ctl->unit = block_group->sectorsize; |
| 2391 | ctl->start = block_group->key.objectid; |
| 2392 | ctl->private = block_group; |
| 2393 | ctl->op = &free_space_op; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 2394 | INIT_LIST_HEAD(&ctl->trimming_ranges); |
| 2395 | mutex_init(&ctl->cache_writeout_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2396 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2397 | /* |
| 2398 | * we only want to have 32k of ram per block group for keeping |
| 2399 | * track of free space, and if we pass 1/2 of that we want to |
| 2400 | * start converting things over to using bitmaps |
| 2401 | */ |
| 2402 | ctl->extents_thresh = ((1024 * 32) / 2) / |
| 2403 | sizeof(struct btrfs_free_space); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2404 | } |
| 2405 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2406 | /* |
| 2407 | * for a given cluster, put all of its extents back into the free |
| 2408 | * space cache. If the block group passed doesn't match the block group |
| 2409 | * pointed to by the cluster, someone else raced in and freed the |
| 2410 | * cluster already. In that case, we just return without changing anything |
| 2411 | */ |
| 2412 | static int |
| 2413 | __btrfs_return_cluster_to_free_space( |
| 2414 | struct btrfs_block_group_cache *block_group, |
| 2415 | struct btrfs_free_cluster *cluster) |
| 2416 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2417 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2418 | struct btrfs_free_space *entry; |
| 2419 | struct rb_node *node; |
| 2420 | |
| 2421 | spin_lock(&cluster->lock); |
| 2422 | if (cluster->block_group != block_group) |
| 2423 | goto out; |
| 2424 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2425 | cluster->block_group = NULL; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2426 | cluster->window_start = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2427 | list_del_init(&cluster->block_group_list); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2428 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2429 | node = rb_first(&cluster->root); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2430 | while (node) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2431 | bool bitmap; |
| 2432 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2433 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2434 | node = rb_next(&entry->offset_index); |
| 2435 | rb_erase(&entry->offset_index, &cluster->root); |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2436 | RB_CLEAR_NODE(&entry->offset_index); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2437 | |
| 2438 | bitmap = (entry->bitmap != NULL); |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2439 | if (!bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2440 | try_merge_free_space(ctl, entry, false); |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2441 | steal_from_bitmap(ctl, entry, false); |
| 2442 | } |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2443 | tree_insert_offset(&ctl->free_space_offset, |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2444 | entry->offset, &entry->offset_index, bitmap); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2445 | } |
Eric Paris | 6bef4d3 | 2010-02-23 19:43:04 +0000 | [diff] [blame] | 2446 | cluster->root = RB_ROOT; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2447 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2448 | out: |
| 2449 | spin_unlock(&cluster->lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2450 | btrfs_put_block_group(block_group); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2451 | return 0; |
| 2452 | } |
| 2453 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 2454 | static void __btrfs_remove_free_space_cache_locked( |
| 2455 | struct btrfs_free_space_ctl *ctl) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2456 | { |
| 2457 | struct btrfs_free_space *info; |
| 2458 | struct rb_node *node; |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2459 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2460 | while ((node = rb_last(&ctl->free_space_offset)) != NULL) { |
| 2461 | info = rb_entry(node, struct btrfs_free_space, offset_index); |
Josef Bacik | 9b90f51 | 2011-06-24 16:02:51 +0000 | [diff] [blame] | 2462 | if (!info->bitmap) { |
| 2463 | unlink_free_space(ctl, info); |
| 2464 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 2465 | } else { |
| 2466 | free_bitmap(ctl, info); |
| 2467 | } |
David Sterba | 351810c | 2015-01-08 15:20:54 +0100 | [diff] [blame] | 2468 | |
| 2469 | cond_resched_lock(&ctl->tree_lock); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2470 | } |
Chris Mason | 0965537 | 2011-05-21 09:27:38 -0400 | [diff] [blame] | 2471 | } |
| 2472 | |
| 2473 | void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl) |
| 2474 | { |
| 2475 | spin_lock(&ctl->tree_lock); |
| 2476 | __btrfs_remove_free_space_cache_locked(ctl); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2477 | spin_unlock(&ctl->tree_lock); |
| 2478 | } |
| 2479 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2480 | void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group) |
| 2481 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2482 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2483 | struct btrfs_free_cluster *cluster; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2484 | struct list_head *head; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2485 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2486 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2487 | while ((head = block_group->cluster_list.next) != |
| 2488 | &block_group->cluster_list) { |
| 2489 | cluster = list_entry(head, struct btrfs_free_cluster, |
| 2490 | block_group_list); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2491 | |
| 2492 | WARN_ON(cluster->block_group != block_group); |
| 2493 | __btrfs_return_cluster_to_free_space(block_group, cluster); |
David Sterba | 351810c | 2015-01-08 15:20:54 +0100 | [diff] [blame] | 2494 | |
| 2495 | cond_resched_lock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2496 | } |
Chris Mason | 0965537 | 2011-05-21 09:27:38 -0400 | [diff] [blame] | 2497 | __btrfs_remove_free_space_cache_locked(ctl); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2498 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2499 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2500 | } |
| 2501 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2502 | 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] | 2503 | u64 offset, u64 bytes, u64 empty_size, |
| 2504 | u64 *max_extent_size) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2505 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2506 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2507 | struct btrfs_free_space *entry = NULL; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2508 | u64 bytes_search = bytes + empty_size; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2509 | u64 ret = 0; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2510 | u64 align_gap = 0; |
| 2511 | u64 align_gap_len = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2512 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2513 | spin_lock(&ctl->tree_lock); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2514 | entry = find_free_space(ctl, &offset, &bytes_search, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2515 | block_group->full_stripe_len, max_extent_size); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2516 | if (!entry) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2517 | goto out; |
| 2518 | |
| 2519 | ret = offset; |
| 2520 | if (entry->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2521 | bitmap_clear_bits(ctl, entry, offset, bytes); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 2522 | if (!entry->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2523 | free_bitmap(ctl, entry); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2524 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2525 | unlink_free_space(ctl, entry); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2526 | align_gap_len = offset - entry->offset; |
| 2527 | align_gap = entry->offset; |
| 2528 | |
| 2529 | entry->offset = offset + bytes; |
| 2530 | WARN_ON(entry->bytes < bytes + align_gap_len); |
| 2531 | |
| 2532 | entry->bytes -= bytes + align_gap_len; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2533 | if (!entry->bytes) |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2534 | kmem_cache_free(btrfs_free_space_cachep, entry); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2535 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2536 | link_free_space(ctl, entry); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2537 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2538 | out: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2539 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2540 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2541 | if (align_gap_len) |
| 2542 | __btrfs_add_free_space(ctl, align_gap, align_gap_len); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2543 | return ret; |
| 2544 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2545 | |
| 2546 | /* |
| 2547 | * given a cluster, put all of its extents back into the free space |
| 2548 | * cache. If a block group is passed, this function will only free |
| 2549 | * a cluster that belongs to the passed block group. |
| 2550 | * |
| 2551 | * Otherwise, it'll get a reference on the block group pointed to by the |
| 2552 | * cluster and remove the cluster from it. |
| 2553 | */ |
| 2554 | int btrfs_return_cluster_to_free_space( |
| 2555 | struct btrfs_block_group_cache *block_group, |
| 2556 | struct btrfs_free_cluster *cluster) |
| 2557 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2558 | struct btrfs_free_space_ctl *ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2559 | int ret; |
| 2560 | |
| 2561 | /* first, get a safe pointer to the block group */ |
| 2562 | spin_lock(&cluster->lock); |
| 2563 | if (!block_group) { |
| 2564 | block_group = cluster->block_group; |
| 2565 | if (!block_group) { |
| 2566 | spin_unlock(&cluster->lock); |
| 2567 | return 0; |
| 2568 | } |
| 2569 | } else if (cluster->block_group != block_group) { |
| 2570 | /* someone else has already freed it don't redo their work */ |
| 2571 | spin_unlock(&cluster->lock); |
| 2572 | return 0; |
| 2573 | } |
| 2574 | atomic_inc(&block_group->count); |
| 2575 | spin_unlock(&cluster->lock); |
| 2576 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2577 | ctl = block_group->free_space_ctl; |
| 2578 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2579 | /* now return any extents the cluster had on it */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2580 | spin_lock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2581 | ret = __btrfs_return_cluster_to_free_space(block_group, cluster); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2582 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2583 | |
| 2584 | /* finally drop our ref */ |
| 2585 | btrfs_put_block_group(block_group); |
| 2586 | return ret; |
| 2587 | } |
| 2588 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2589 | static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, |
| 2590 | struct btrfs_free_cluster *cluster, |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2591 | struct btrfs_free_space *entry, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2592 | u64 bytes, u64 min_start, |
| 2593 | u64 *max_extent_size) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2594 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2595 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2596 | int err; |
| 2597 | u64 search_start = cluster->window_start; |
| 2598 | u64 search_bytes = bytes; |
| 2599 | u64 ret = 0; |
| 2600 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2601 | search_start = min_start; |
| 2602 | search_bytes = bytes; |
| 2603 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2604 | err = search_bitmap(ctl, entry, &search_start, &search_bytes); |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2605 | if (err) { |
| 2606 | if (search_bytes > *max_extent_size) |
| 2607 | *max_extent_size = search_bytes; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2608 | return 0; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2609 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2610 | |
| 2611 | ret = search_start; |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 2612 | __bitmap_clear_bits(ctl, entry, ret, bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2613 | |
| 2614 | return ret; |
| 2615 | } |
| 2616 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2617 | /* |
| 2618 | * given a cluster, try to allocate 'bytes' from it, returns 0 |
| 2619 | * if it couldn't find anything suitably large, or a logical disk offset |
| 2620 | * if things worked out |
| 2621 | */ |
| 2622 | u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, |
| 2623 | struct btrfs_free_cluster *cluster, u64 bytes, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2624 | u64 min_start, u64 *max_extent_size) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2625 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2626 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2627 | struct btrfs_free_space *entry = NULL; |
| 2628 | struct rb_node *node; |
| 2629 | u64 ret = 0; |
| 2630 | |
| 2631 | spin_lock(&cluster->lock); |
| 2632 | if (bytes > cluster->max_size) |
| 2633 | goto out; |
| 2634 | |
| 2635 | if (cluster->block_group != block_group) |
| 2636 | goto out; |
| 2637 | |
| 2638 | node = rb_first(&cluster->root); |
| 2639 | if (!node) |
| 2640 | goto out; |
| 2641 | |
| 2642 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2643 | while (1) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2644 | if (entry->bytes < bytes && entry->bytes > *max_extent_size) |
| 2645 | *max_extent_size = entry->bytes; |
| 2646 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2647 | if (entry->bytes < bytes || |
| 2648 | (!entry->bitmap && entry->offset < min_start)) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2649 | node = rb_next(&entry->offset_index); |
| 2650 | if (!node) |
| 2651 | break; |
| 2652 | entry = rb_entry(node, struct btrfs_free_space, |
| 2653 | offset_index); |
| 2654 | continue; |
| 2655 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2656 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2657 | if (entry->bitmap) { |
| 2658 | ret = btrfs_alloc_from_bitmap(block_group, |
| 2659 | cluster, entry, bytes, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2660 | cluster->window_start, |
| 2661 | max_extent_size); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2662 | if (ret == 0) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2663 | node = rb_next(&entry->offset_index); |
| 2664 | if (!node) |
| 2665 | break; |
| 2666 | entry = rb_entry(node, struct btrfs_free_space, |
| 2667 | offset_index); |
| 2668 | continue; |
| 2669 | } |
Josef Bacik | 9b23062 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 2670 | cluster->window_start += bytes; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2671 | } else { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2672 | ret = entry->offset; |
| 2673 | |
| 2674 | entry->offset += bytes; |
| 2675 | entry->bytes -= bytes; |
| 2676 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2677 | |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2678 | if (entry->bytes == 0) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2679 | rb_erase(&entry->offset_index, &cluster->root); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2680 | break; |
| 2681 | } |
| 2682 | out: |
| 2683 | spin_unlock(&cluster->lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2684 | |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2685 | if (!ret) |
| 2686 | return 0; |
| 2687 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2688 | spin_lock(&ctl->tree_lock); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2689 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2690 | ctl->free_space -= bytes; |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2691 | if (entry->bytes == 0) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2692 | ctl->free_extents--; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2693 | if (entry->bitmap) { |
| 2694 | kfree(entry->bitmap); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2695 | ctl->total_bitmaps--; |
| 2696 | ctl->op->recalc_thresholds(ctl); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2697 | } |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2698 | kmem_cache_free(btrfs_free_space_cachep, entry); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2699 | } |
| 2700 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2701 | spin_unlock(&ctl->tree_lock); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2702 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2703 | return ret; |
| 2704 | } |
| 2705 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2706 | static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group, |
| 2707 | struct btrfs_free_space *entry, |
| 2708 | struct btrfs_free_cluster *cluster, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2709 | u64 offset, u64 bytes, |
| 2710 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2711 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2712 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2713 | unsigned long next_zero; |
| 2714 | unsigned long i; |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2715 | unsigned long want_bits; |
| 2716 | unsigned long min_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2717 | unsigned long found_bits; |
| 2718 | unsigned long start = 0; |
| 2719 | unsigned long total_found = 0; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2720 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2721 | |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2722 | i = offset_to_bit(entry->offset, ctl->unit, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2723 | max_t(u64, offset, entry->offset)); |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2724 | want_bits = bytes_to_bits(bytes, ctl->unit); |
| 2725 | min_bits = bytes_to_bits(min_bytes, ctl->unit); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2726 | |
| 2727 | again: |
| 2728 | found_bits = 0; |
Wei Yongjun | ebb3dad | 2012-09-13 20:29:02 -0600 | [diff] [blame] | 2729 | for_each_set_bit_from(i, entry->bitmap, BITS_PER_BITMAP) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2730 | next_zero = find_next_zero_bit(entry->bitmap, |
| 2731 | BITS_PER_BITMAP, i); |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2732 | if (next_zero - i >= min_bits) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2733 | found_bits = next_zero - i; |
| 2734 | break; |
| 2735 | } |
| 2736 | i = next_zero; |
| 2737 | } |
| 2738 | |
| 2739 | if (!found_bits) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2740 | return -ENOSPC; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2741 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2742 | if (!total_found) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2743 | start = i; |
Alexandre Oliva | b78d09b | 2011-11-30 13:43:00 -0500 | [diff] [blame] | 2744 | cluster->max_size = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2745 | } |
| 2746 | |
| 2747 | total_found += found_bits; |
| 2748 | |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2749 | if (cluster->max_size < found_bits * ctl->unit) |
| 2750 | cluster->max_size = found_bits * ctl->unit; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2751 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2752 | if (total_found < want_bits || cluster->max_size < cont1_bytes) { |
| 2753 | i = next_zero + 1; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2754 | goto again; |
| 2755 | } |
| 2756 | |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2757 | cluster->window_start = start * ctl->unit + entry->offset; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2758 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2759 | ret = tree_insert_offset(&cluster->root, entry->offset, |
| 2760 | &entry->offset_index, 1); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 2761 | ASSERT(!ret); /* -EEXIST; Logic error */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2762 | |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2763 | trace_btrfs_setup_cluster(block_group, cluster, |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2764 | total_found * ctl->unit, 1); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2765 | return 0; |
| 2766 | } |
| 2767 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2768 | /* |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2769 | * 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] | 2770 | * Try to find a cluster with at least bytes total bytes, at least one |
| 2771 | * extent of cont1_bytes, and other clusters of at least min_bytes. |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2772 | */ |
Josef Bacik | 3de85bb | 2011-05-25 13:07:37 -0400 | [diff] [blame] | 2773 | static noinline int |
| 2774 | setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, |
| 2775 | struct btrfs_free_cluster *cluster, |
| 2776 | struct list_head *bitmaps, u64 offset, u64 bytes, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2777 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2778 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2779 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2780 | struct btrfs_free_space *first = NULL; |
| 2781 | struct btrfs_free_space *entry = NULL; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2782 | struct btrfs_free_space *last; |
| 2783 | struct rb_node *node; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2784 | u64 window_free; |
| 2785 | u64 max_extent; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2786 | u64 total_size = 0; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2787 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2788 | entry = tree_search_offset(ctl, offset, 0, 1); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2789 | if (!entry) |
| 2790 | return -ENOSPC; |
| 2791 | |
| 2792 | /* |
| 2793 | * We don't want bitmaps, so just move along until we find a normal |
| 2794 | * extent entry. |
| 2795 | */ |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2796 | while (entry->bitmap || entry->bytes < min_bytes) { |
| 2797 | if (entry->bitmap && list_empty(&entry->list)) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2798 | list_add_tail(&entry->list, bitmaps); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2799 | node = rb_next(&entry->offset_index); |
| 2800 | if (!node) |
| 2801 | return -ENOSPC; |
| 2802 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2803 | } |
| 2804 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2805 | window_free = entry->bytes; |
| 2806 | max_extent = entry->bytes; |
| 2807 | first = entry; |
| 2808 | last = entry; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2809 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2810 | for (node = rb_next(&entry->offset_index); node; |
| 2811 | node = rb_next(&entry->offset_index)) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2812 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2813 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2814 | if (entry->bitmap) { |
| 2815 | if (list_empty(&entry->list)) |
| 2816 | list_add_tail(&entry->list, bitmaps); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2817 | continue; |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2818 | } |
| 2819 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2820 | if (entry->bytes < min_bytes) |
| 2821 | continue; |
| 2822 | |
| 2823 | last = entry; |
| 2824 | window_free += entry->bytes; |
| 2825 | if (entry->bytes > max_extent) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2826 | max_extent = entry->bytes; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2827 | } |
| 2828 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2829 | if (window_free < bytes || max_extent < cont1_bytes) |
| 2830 | return -ENOSPC; |
| 2831 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2832 | cluster->window_start = first->offset; |
| 2833 | |
| 2834 | node = &first->offset_index; |
| 2835 | |
| 2836 | /* |
| 2837 | * now we've found our entries, pull them out of the free space |
| 2838 | * cache and put them into the cluster rbtree |
| 2839 | */ |
| 2840 | do { |
| 2841 | int ret; |
| 2842 | |
| 2843 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2844 | node = rb_next(&entry->offset_index); |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2845 | if (entry->bitmap || entry->bytes < min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2846 | continue; |
| 2847 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2848 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2849 | ret = tree_insert_offset(&cluster->root, entry->offset, |
| 2850 | &entry->offset_index, 0); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2851 | total_size += entry->bytes; |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 2852 | ASSERT(!ret); /* -EEXIST; Logic error */ |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2853 | } while (node && entry != last); |
| 2854 | |
| 2855 | cluster->max_size = max_extent; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2856 | trace_btrfs_setup_cluster(block_group, cluster, total_size, 0); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2857 | return 0; |
| 2858 | } |
| 2859 | |
| 2860 | /* |
| 2861 | * This specifically looks for bitmaps that may work in the cluster, we assume |
| 2862 | * that we have already failed to find extents that will work. |
| 2863 | */ |
Josef Bacik | 3de85bb | 2011-05-25 13:07:37 -0400 | [diff] [blame] | 2864 | static noinline int |
| 2865 | setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, |
| 2866 | struct btrfs_free_cluster *cluster, |
| 2867 | struct list_head *bitmaps, u64 offset, u64 bytes, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2868 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2869 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2870 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2871 | struct btrfs_free_space *entry; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2872 | int ret = -ENOSPC; |
Li Zefan | 0f0fbf1 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2873 | u64 bitmap_offset = offset_to_bitmap(ctl, offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2874 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2875 | if (ctl->total_bitmaps == 0) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2876 | return -ENOSPC; |
| 2877 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2878 | /* |
Li Zefan | 0f0fbf1 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2879 | * The bitmap that covers offset won't be in the list unless offset |
| 2880 | * is just its start offset. |
| 2881 | */ |
| 2882 | entry = list_first_entry(bitmaps, struct btrfs_free_space, list); |
| 2883 | if (entry->offset != bitmap_offset) { |
| 2884 | entry = tree_search_offset(ctl, bitmap_offset, 1, 0); |
| 2885 | if (entry && list_empty(&entry->list)) |
| 2886 | list_add(&entry->list, bitmaps); |
| 2887 | } |
| 2888 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2889 | list_for_each_entry(entry, bitmaps, list) { |
Josef Bacik | 357b978 | 2012-01-26 15:01:11 -0500 | [diff] [blame] | 2890 | if (entry->bytes < bytes) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2891 | continue; |
| 2892 | ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2893 | bytes, cont1_bytes, min_bytes); |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2894 | if (!ret) |
| 2895 | return 0; |
| 2896 | } |
| 2897 | |
| 2898 | /* |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2899 | * The bitmaps list has all the bitmaps that record free space |
| 2900 | * starting after offset, so no more search is required. |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2901 | */ |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2902 | return -ENOSPC; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2903 | } |
| 2904 | |
| 2905 | /* |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2906 | * 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] | 2907 | * is to find at least bytes+empty_size. |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2908 | * We might not find them all in one contiguous area. |
| 2909 | * |
| 2910 | * returns zero and sets up cluster if things worked out, otherwise |
| 2911 | * it returns -enospc |
| 2912 | */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 2913 | int btrfs_find_space_cluster(struct btrfs_root *root, |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2914 | struct btrfs_block_group_cache *block_group, |
| 2915 | struct btrfs_free_cluster *cluster, |
| 2916 | u64 offset, u64 bytes, u64 empty_size) |
| 2917 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2918 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2919 | struct btrfs_free_space *entry, *tmp; |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2920 | LIST_HEAD(bitmaps); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2921 | u64 min_bytes; |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2922 | u64 cont1_bytes; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2923 | int ret; |
| 2924 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2925 | /* |
| 2926 | * Choose the minimum extent size we'll require for this |
| 2927 | * cluster. For SSD_SPREAD, don't allow any fragmentation. |
| 2928 | * For metadata, allow allocates with smaller extents. For |
| 2929 | * data, keep it dense. |
| 2930 | */ |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 2931 | if (btrfs_test_opt(root, SSD_SPREAD)) { |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2932 | cont1_bytes = min_bytes = bytes + empty_size; |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 2933 | } else if (block_group->flags & BTRFS_BLOCK_GROUP_METADATA) { |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2934 | cont1_bytes = bytes; |
| 2935 | min_bytes = block_group->sectorsize; |
| 2936 | } else { |
| 2937 | cont1_bytes = max(bytes, (bytes + empty_size) >> 2); |
| 2938 | min_bytes = block_group->sectorsize; |
| 2939 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2940 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2941 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 7d0d2e8 | 2011-03-18 15:13:42 -0400 | [diff] [blame] | 2942 | |
| 2943 | /* |
| 2944 | * If we know we don't have enough space to make a cluster don't even |
| 2945 | * bother doing all the work to try and find one. |
| 2946 | */ |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2947 | if (ctl->free_space < bytes) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2948 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 7d0d2e8 | 2011-03-18 15:13:42 -0400 | [diff] [blame] | 2949 | return -ENOSPC; |
| 2950 | } |
| 2951 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2952 | spin_lock(&cluster->lock); |
| 2953 | |
| 2954 | /* someone already found a cluster, hooray */ |
| 2955 | if (cluster->block_group) { |
| 2956 | ret = 0; |
| 2957 | goto out; |
| 2958 | } |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2959 | |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2960 | trace_btrfs_find_cluster(block_group, offset, bytes, empty_size, |
| 2961 | min_bytes); |
| 2962 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2963 | ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2964 | bytes + empty_size, |
| 2965 | cont1_bytes, min_bytes); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2966 | if (ret) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2967 | ret = setup_cluster_bitmap(block_group, cluster, &bitmaps, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2968 | offset, bytes + empty_size, |
| 2969 | cont1_bytes, min_bytes); |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2970 | |
| 2971 | /* Clear our temporary list */ |
| 2972 | list_for_each_entry_safe(entry, tmp, &bitmaps, list) |
| 2973 | list_del_init(&entry->list); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2974 | |
| 2975 | if (!ret) { |
| 2976 | atomic_inc(&block_group->count); |
| 2977 | list_add_tail(&cluster->block_group_list, |
| 2978 | &block_group->cluster_list); |
| 2979 | cluster->block_group = block_group; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2980 | } else { |
| 2981 | trace_btrfs_failed_cluster_setup(block_group); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2982 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2983 | out: |
| 2984 | spin_unlock(&cluster->lock); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2985 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2986 | |
| 2987 | return ret; |
| 2988 | } |
| 2989 | |
| 2990 | /* |
| 2991 | * simple code to zero out a cluster |
| 2992 | */ |
| 2993 | void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) |
| 2994 | { |
| 2995 | spin_lock_init(&cluster->lock); |
| 2996 | spin_lock_init(&cluster->refill_lock); |
Eric Paris | 6bef4d3 | 2010-02-23 19:43:04 +0000 | [diff] [blame] | 2997 | cluster->root = RB_ROOT; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2998 | cluster->max_size = 0; |
| 2999 | INIT_LIST_HEAD(&cluster->block_group_list); |
| 3000 | cluster->block_group = NULL; |
| 3001 | } |
| 3002 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3003 | static int do_trimming(struct btrfs_block_group_cache *block_group, |
| 3004 | u64 *total_trimmed, u64 start, u64 bytes, |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3005 | u64 reserved_start, u64 reserved_bytes, |
| 3006 | struct btrfs_trim_range *trim_entry) |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3007 | { |
| 3008 | struct btrfs_space_info *space_info = block_group->space_info; |
| 3009 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3010 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3011 | int ret; |
| 3012 | int update = 0; |
| 3013 | u64 trimmed = 0; |
| 3014 | |
| 3015 | spin_lock(&space_info->lock); |
| 3016 | spin_lock(&block_group->lock); |
| 3017 | if (!block_group->ro) { |
| 3018 | block_group->reserved += reserved_bytes; |
| 3019 | space_info->bytes_reserved += reserved_bytes; |
| 3020 | update = 1; |
| 3021 | } |
| 3022 | spin_unlock(&block_group->lock); |
| 3023 | spin_unlock(&space_info->lock); |
| 3024 | |
Filipe Manana | 1edb647b | 2014-12-08 14:01:12 +0000 | [diff] [blame] | 3025 | ret = btrfs_discard_extent(fs_info->extent_root, |
| 3026 | start, bytes, &trimmed); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3027 | if (!ret) |
| 3028 | *total_trimmed += trimmed; |
| 3029 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3030 | mutex_lock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3031 | btrfs_add_free_space(block_group, reserved_start, reserved_bytes); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3032 | list_del(&trim_entry->list); |
| 3033 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3034 | |
| 3035 | if (update) { |
| 3036 | spin_lock(&space_info->lock); |
| 3037 | spin_lock(&block_group->lock); |
| 3038 | if (block_group->ro) |
| 3039 | space_info->bytes_readonly += reserved_bytes; |
| 3040 | block_group->reserved -= reserved_bytes; |
| 3041 | space_info->bytes_reserved -= reserved_bytes; |
| 3042 | spin_unlock(&space_info->lock); |
| 3043 | spin_unlock(&block_group->lock); |
| 3044 | } |
| 3045 | |
| 3046 | return ret; |
| 3047 | } |
| 3048 | |
| 3049 | static int trim_no_bitmap(struct btrfs_block_group_cache *block_group, |
| 3050 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3051 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3052 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3053 | struct btrfs_free_space *entry; |
| 3054 | struct rb_node *node; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3055 | int ret = 0; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3056 | u64 extent_start; |
| 3057 | u64 extent_bytes; |
| 3058 | u64 bytes; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3059 | |
| 3060 | while (start < end) { |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3061 | struct btrfs_trim_range trim_entry; |
| 3062 | |
| 3063 | mutex_lock(&ctl->cache_writeout_mutex); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3064 | spin_lock(&ctl->tree_lock); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3065 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3066 | if (ctl->free_space < minlen) { |
| 3067 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3068 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3069 | break; |
| 3070 | } |
| 3071 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3072 | entry = tree_search_offset(ctl, start, 0, 1); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3073 | if (!entry) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3074 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3075 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3076 | break; |
| 3077 | } |
| 3078 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3079 | /* skip bitmaps */ |
| 3080 | while (entry->bitmap) { |
| 3081 | node = rb_next(&entry->offset_index); |
| 3082 | if (!node) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3083 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3084 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3085 | goto out; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3086 | } |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3087 | entry = rb_entry(node, struct btrfs_free_space, |
| 3088 | offset_index); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3089 | } |
| 3090 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3091 | if (entry->offset >= end) { |
| 3092 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3093 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3094 | break; |
| 3095 | } |
| 3096 | |
| 3097 | extent_start = entry->offset; |
| 3098 | extent_bytes = entry->bytes; |
| 3099 | start = max(start, extent_start); |
| 3100 | bytes = min(extent_start + extent_bytes, end) - start; |
| 3101 | if (bytes < minlen) { |
| 3102 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3103 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3104 | goto next; |
| 3105 | } |
| 3106 | |
| 3107 | unlink_free_space(ctl, entry); |
| 3108 | kmem_cache_free(btrfs_free_space_cachep, entry); |
| 3109 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3110 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3111 | trim_entry.start = extent_start; |
| 3112 | trim_entry.bytes = extent_bytes; |
| 3113 | list_add_tail(&trim_entry.list, &ctl->trimming_ranges); |
| 3114 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3115 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3116 | ret = do_trimming(block_group, total_trimmed, start, bytes, |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3117 | extent_start, extent_bytes, &trim_entry); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3118 | if (ret) |
| 3119 | break; |
| 3120 | next: |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3121 | start += bytes; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3122 | |
| 3123 | if (fatal_signal_pending(current)) { |
| 3124 | ret = -ERESTARTSYS; |
| 3125 | break; |
| 3126 | } |
| 3127 | |
| 3128 | cond_resched(); |
| 3129 | } |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3130 | out: |
| 3131 | return ret; |
| 3132 | } |
| 3133 | |
| 3134 | static int trim_bitmaps(struct btrfs_block_group_cache *block_group, |
| 3135 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) |
| 3136 | { |
| 3137 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
| 3138 | struct btrfs_free_space *entry; |
| 3139 | int ret = 0; |
| 3140 | int ret2; |
| 3141 | u64 bytes; |
| 3142 | u64 offset = offset_to_bitmap(ctl, start); |
| 3143 | |
| 3144 | while (offset < end) { |
| 3145 | bool next_bitmap = false; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3146 | struct btrfs_trim_range trim_entry; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3147 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3148 | mutex_lock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3149 | spin_lock(&ctl->tree_lock); |
| 3150 | |
| 3151 | if (ctl->free_space < minlen) { |
| 3152 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3153 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3154 | break; |
| 3155 | } |
| 3156 | |
| 3157 | entry = tree_search_offset(ctl, offset, 1, 0); |
| 3158 | if (!entry) { |
| 3159 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3160 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3161 | next_bitmap = true; |
| 3162 | goto next; |
| 3163 | } |
| 3164 | |
| 3165 | bytes = minlen; |
| 3166 | ret2 = search_bitmap(ctl, entry, &start, &bytes); |
| 3167 | if (ret2 || start >= end) { |
| 3168 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3169 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3170 | next_bitmap = true; |
| 3171 | goto next; |
| 3172 | } |
| 3173 | |
| 3174 | bytes = min(bytes, end - start); |
| 3175 | if (bytes < minlen) { |
| 3176 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3177 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3178 | goto next; |
| 3179 | } |
| 3180 | |
| 3181 | bitmap_clear_bits(ctl, entry, start, bytes); |
| 3182 | if (entry->bytes == 0) |
| 3183 | free_bitmap(ctl, entry); |
| 3184 | |
| 3185 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3186 | trim_entry.start = start; |
| 3187 | trim_entry.bytes = bytes; |
| 3188 | list_add_tail(&trim_entry.list, &ctl->trimming_ranges); |
| 3189 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3190 | |
| 3191 | ret = do_trimming(block_group, total_trimmed, start, bytes, |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3192 | start, bytes, &trim_entry); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3193 | if (ret) |
| 3194 | break; |
| 3195 | next: |
| 3196 | if (next_bitmap) { |
| 3197 | offset += BITS_PER_BITMAP * ctl->unit; |
| 3198 | } else { |
| 3199 | start += bytes; |
| 3200 | if (start >= offset + BITS_PER_BITMAP * ctl->unit) |
| 3201 | offset += BITS_PER_BITMAP * ctl->unit; |
| 3202 | } |
| 3203 | |
| 3204 | if (fatal_signal_pending(current)) { |
| 3205 | ret = -ERESTARTSYS; |
| 3206 | break; |
| 3207 | } |
| 3208 | |
| 3209 | cond_resched(); |
| 3210 | } |
| 3211 | |
| 3212 | return ret; |
| 3213 | } |
| 3214 | |
| 3215 | int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, |
| 3216 | u64 *trimmed, u64 start, u64 end, u64 minlen) |
| 3217 | { |
| 3218 | int ret; |
| 3219 | |
| 3220 | *trimmed = 0; |
| 3221 | |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3222 | spin_lock(&block_group->lock); |
| 3223 | if (block_group->removed) { |
| 3224 | spin_unlock(&block_group->lock); |
| 3225 | return 0; |
| 3226 | } |
| 3227 | atomic_inc(&block_group->trimming); |
| 3228 | spin_unlock(&block_group->lock); |
| 3229 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3230 | ret = trim_no_bitmap(block_group, trimmed, start, end, minlen); |
| 3231 | if (ret) |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3232 | goto out; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3233 | |
| 3234 | ret = trim_bitmaps(block_group, trimmed, start, end, minlen); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3235 | out: |
| 3236 | spin_lock(&block_group->lock); |
| 3237 | if (atomic_dec_and_test(&block_group->trimming) && |
| 3238 | block_group->removed) { |
| 3239 | struct extent_map_tree *em_tree; |
| 3240 | struct extent_map *em; |
| 3241 | |
| 3242 | spin_unlock(&block_group->lock); |
| 3243 | |
Filipe Manana | a1e7e16 | 2014-12-04 15:31:01 +0000 | [diff] [blame] | 3244 | lock_chunks(block_group->fs_info->chunk_root); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3245 | em_tree = &block_group->fs_info->mapping_tree.map_tree; |
| 3246 | write_lock(&em_tree->lock); |
| 3247 | em = lookup_extent_mapping(em_tree, block_group->key.objectid, |
| 3248 | 1); |
| 3249 | BUG_ON(!em); /* logic error, can't happen */ |
Filipe Manana | a1e7e16 | 2014-12-04 15:31:01 +0000 | [diff] [blame] | 3250 | /* |
| 3251 | * remove_extent_mapping() will delete us from the pinned_chunks |
| 3252 | * list, which is protected by the chunk mutex. |
| 3253 | */ |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3254 | remove_extent_mapping(em_tree, em); |
| 3255 | write_unlock(&em_tree->lock); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3256 | unlock_chunks(block_group->fs_info->chunk_root); |
| 3257 | |
| 3258 | /* once for us and once for the tree */ |
| 3259 | free_extent_map(em); |
| 3260 | free_extent_map(em); |
Filipe Manana | 946ddbe | 2014-12-01 17:04:40 +0000 | [diff] [blame] | 3261 | |
| 3262 | /* |
| 3263 | * We've left one free space entry and other tasks trimming |
| 3264 | * this block group have left 1 entry each one. Free them. |
| 3265 | */ |
| 3266 | __btrfs_remove_free_space_cache(block_group->free_space_ctl); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3267 | } else { |
| 3268 | spin_unlock(&block_group->lock); |
| 3269 | } |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3270 | |
| 3271 | return ret; |
| 3272 | } |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 3273 | |
| 3274 | /* |
| 3275 | * Find the left-most item in the cache tree, and then return the |
| 3276 | * smallest inode number in the item. |
| 3277 | * |
| 3278 | * Note: the returned inode number may not be the smallest one in |
| 3279 | * the tree, if the left-most item is a bitmap. |
| 3280 | */ |
| 3281 | u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root) |
| 3282 | { |
| 3283 | struct btrfs_free_space_ctl *ctl = fs_root->free_ino_ctl; |
| 3284 | struct btrfs_free_space *entry = NULL; |
| 3285 | u64 ino = 0; |
| 3286 | |
| 3287 | spin_lock(&ctl->tree_lock); |
| 3288 | |
| 3289 | if (RB_EMPTY_ROOT(&ctl->free_space_offset)) |
| 3290 | goto out; |
| 3291 | |
| 3292 | entry = rb_entry(rb_first(&ctl->free_space_offset), |
| 3293 | struct btrfs_free_space, offset_index); |
| 3294 | |
| 3295 | if (!entry->bitmap) { |
| 3296 | ino = entry->offset; |
| 3297 | |
| 3298 | unlink_free_space(ctl, entry); |
| 3299 | entry->offset++; |
| 3300 | entry->bytes--; |
| 3301 | if (!entry->bytes) |
| 3302 | kmem_cache_free(btrfs_free_space_cachep, entry); |
| 3303 | else |
| 3304 | link_free_space(ctl, entry); |
| 3305 | } else { |
| 3306 | u64 offset = 0; |
| 3307 | u64 count = 1; |
| 3308 | int ret; |
| 3309 | |
| 3310 | ret = search_bitmap(ctl, entry, &offset, &count); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3311 | /* Logic error; Should be empty if it can't find anything */ |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 3312 | ASSERT(!ret); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 3313 | |
| 3314 | ino = offset; |
| 3315 | bitmap_clear_bits(ctl, entry, offset, 1); |
| 3316 | if (entry->bytes == 0) |
| 3317 | free_bitmap(ctl, entry); |
| 3318 | } |
| 3319 | out: |
| 3320 | spin_unlock(&ctl->tree_lock); |
| 3321 | |
| 3322 | return ino; |
| 3323 | } |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3324 | |
| 3325 | struct inode *lookup_free_ino_inode(struct btrfs_root *root, |
| 3326 | struct btrfs_path *path) |
| 3327 | { |
| 3328 | struct inode *inode = NULL; |
| 3329 | |
David Sterba | 57cdc8d | 2014-02-05 02:37:48 +0100 | [diff] [blame] | 3330 | spin_lock(&root->ino_cache_lock); |
| 3331 | if (root->ino_cache_inode) |
| 3332 | inode = igrab(root->ino_cache_inode); |
| 3333 | spin_unlock(&root->ino_cache_lock); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3334 | if (inode) |
| 3335 | return inode; |
| 3336 | |
| 3337 | inode = __lookup_free_space_inode(root, path, 0); |
| 3338 | if (IS_ERR(inode)) |
| 3339 | return inode; |
| 3340 | |
David Sterba | 57cdc8d | 2014-02-05 02:37:48 +0100 | [diff] [blame] | 3341 | spin_lock(&root->ino_cache_lock); |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 3342 | if (!btrfs_fs_closing(root->fs_info)) |
David Sterba | 57cdc8d | 2014-02-05 02:37:48 +0100 | [diff] [blame] | 3343 | root->ino_cache_inode = igrab(inode); |
| 3344 | spin_unlock(&root->ino_cache_lock); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3345 | |
| 3346 | return inode; |
| 3347 | } |
| 3348 | |
| 3349 | int create_free_ino_inode(struct btrfs_root *root, |
| 3350 | struct btrfs_trans_handle *trans, |
| 3351 | struct btrfs_path *path) |
| 3352 | { |
| 3353 | return __create_free_space_inode(root, trans, path, |
| 3354 | BTRFS_FREE_INO_OBJECTID, 0); |
| 3355 | } |
| 3356 | |
| 3357 | int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root) |
| 3358 | { |
| 3359 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; |
| 3360 | struct btrfs_path *path; |
| 3361 | struct inode *inode; |
| 3362 | int ret = 0; |
| 3363 | u64 root_gen = btrfs_root_generation(&root->root_item); |
| 3364 | |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 3365 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 3366 | return 0; |
| 3367 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3368 | /* |
| 3369 | * If we're unmounting then just return, since this does a search on the |
| 3370 | * normal root and not the commit root and we could deadlock. |
| 3371 | */ |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 3372 | if (btrfs_fs_closing(fs_info)) |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3373 | return 0; |
| 3374 | |
| 3375 | path = btrfs_alloc_path(); |
| 3376 | if (!path) |
| 3377 | return 0; |
| 3378 | |
| 3379 | inode = lookup_free_ino_inode(root, path); |
| 3380 | if (IS_ERR(inode)) |
| 3381 | goto out; |
| 3382 | |
| 3383 | if (root_gen != BTRFS_I(inode)->generation) |
| 3384 | goto out_put; |
| 3385 | |
| 3386 | ret = __load_free_space_cache(root, inode, ctl, path, 0); |
| 3387 | |
| 3388 | if (ret < 0) |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 3389 | btrfs_err(fs_info, |
| 3390 | "failed to load free ino cache for root %llu", |
| 3391 | root->root_key.objectid); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3392 | out_put: |
| 3393 | iput(inode); |
| 3394 | out: |
| 3395 | btrfs_free_path(path); |
| 3396 | return ret; |
| 3397 | } |
| 3398 | |
| 3399 | int btrfs_write_out_ino_cache(struct btrfs_root *root, |
| 3400 | struct btrfs_trans_handle *trans, |
Filipe David Borba Manana | 53645a9 | 2013-09-20 14:43:28 +0100 | [diff] [blame] | 3401 | struct btrfs_path *path, |
| 3402 | struct inode *inode) |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3403 | { |
| 3404 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3405 | int ret; |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3406 | struct btrfs_io_ctl io_ctl; |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3407 | |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 3408 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 3409 | return 0; |
| 3410 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3411 | ret = __btrfs_write_out_cache(root, inode, ctl, NULL, &io_ctl, |
| 3412 | trans, path, 0) || |
| 3413 | btrfs_wait_cache_io(root, trans, NULL, &io_ctl, path, 0); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 3414 | if (ret) { |
| 3415 | btrfs_delalloc_release_metadata(inode, inode->i_size); |
| 3416 | #ifdef DEBUG |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 3417 | btrfs_err(root->fs_info, |
| 3418 | "failed to write free ino cache for root %llu", |
| 3419 | root->root_key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 3420 | #endif |
| 3421 | } |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3422 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3423 | return ret; |
| 3424 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3425 | |
| 3426 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3427 | /* |
| 3428 | * Use this if you need to make a bitmap or extent entry specifically, it |
| 3429 | * doesn't do any of the merging that add_free_space does, this acts a lot like |
| 3430 | * how the free space cache loading stuff works, so you can get really weird |
| 3431 | * configurations. |
| 3432 | */ |
| 3433 | int test_add_free_space_entry(struct btrfs_block_group_cache *cache, |
| 3434 | u64 offset, u64 bytes, bool bitmap) |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3435 | { |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3436 | struct btrfs_free_space_ctl *ctl = cache->free_space_ctl; |
| 3437 | struct btrfs_free_space *info = NULL, *bitmap_info; |
| 3438 | void *map = NULL; |
| 3439 | u64 bytes_added; |
| 3440 | int ret; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3441 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3442 | again: |
| 3443 | if (!info) { |
| 3444 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); |
| 3445 | if (!info) |
| 3446 | return -ENOMEM; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3447 | } |
| 3448 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3449 | if (!bitmap) { |
| 3450 | spin_lock(&ctl->tree_lock); |
| 3451 | info->offset = offset; |
| 3452 | info->bytes = bytes; |
| 3453 | ret = link_free_space(ctl, info); |
| 3454 | spin_unlock(&ctl->tree_lock); |
| 3455 | if (ret) |
| 3456 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 3457 | return ret; |
| 3458 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3459 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3460 | if (!map) { |
| 3461 | map = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
| 3462 | if (!map) { |
| 3463 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 3464 | return -ENOMEM; |
| 3465 | } |
| 3466 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3467 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3468 | spin_lock(&ctl->tree_lock); |
| 3469 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
| 3470 | 1, 0); |
| 3471 | if (!bitmap_info) { |
| 3472 | info->bitmap = map; |
| 3473 | map = NULL; |
| 3474 | add_new_bitmap(ctl, info, offset); |
| 3475 | bitmap_info = info; |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 3476 | info = NULL; |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3477 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3478 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3479 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
| 3480 | bytes -= bytes_added; |
| 3481 | offset += bytes_added; |
| 3482 | spin_unlock(&ctl->tree_lock); |
| 3483 | |
| 3484 | if (bytes) |
| 3485 | goto again; |
| 3486 | |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 3487 | if (info) |
| 3488 | kmem_cache_free(btrfs_free_space_cachep, info); |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3489 | if (map) |
| 3490 | kfree(map); |
| 3491 | return 0; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3492 | } |
| 3493 | |
| 3494 | /* |
| 3495 | * Checks to see if the given range is in the free space cache. This is really |
| 3496 | * just used to check the absence of space, so if there is free space in the |
| 3497 | * range at all we will return 1. |
| 3498 | */ |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3499 | int test_check_exists(struct btrfs_block_group_cache *cache, |
| 3500 | u64 offset, u64 bytes) |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3501 | { |
| 3502 | struct btrfs_free_space_ctl *ctl = cache->free_space_ctl; |
| 3503 | struct btrfs_free_space *info; |
| 3504 | int ret = 0; |
| 3505 | |
| 3506 | spin_lock(&ctl->tree_lock); |
| 3507 | info = tree_search_offset(ctl, offset, 0, 0); |
| 3508 | if (!info) { |
| 3509 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
| 3510 | 1, 0); |
| 3511 | if (!info) |
| 3512 | goto out; |
| 3513 | } |
| 3514 | |
| 3515 | have_info: |
| 3516 | if (info->bitmap) { |
| 3517 | u64 bit_off, bit_bytes; |
| 3518 | struct rb_node *n; |
| 3519 | struct btrfs_free_space *tmp; |
| 3520 | |
| 3521 | bit_off = offset; |
| 3522 | bit_bytes = ctl->unit; |
| 3523 | ret = search_bitmap(ctl, info, &bit_off, &bit_bytes); |
| 3524 | if (!ret) { |
| 3525 | if (bit_off == offset) { |
| 3526 | ret = 1; |
| 3527 | goto out; |
| 3528 | } else if (bit_off > offset && |
| 3529 | offset + bytes > bit_off) { |
| 3530 | ret = 1; |
| 3531 | goto out; |
| 3532 | } |
| 3533 | } |
| 3534 | |
| 3535 | n = rb_prev(&info->offset_index); |
| 3536 | while (n) { |
| 3537 | tmp = rb_entry(n, struct btrfs_free_space, |
| 3538 | offset_index); |
| 3539 | if (tmp->offset + tmp->bytes < offset) |
| 3540 | break; |
| 3541 | if (offset + bytes < tmp->offset) { |
| 3542 | n = rb_prev(&info->offset_index); |
| 3543 | continue; |
| 3544 | } |
| 3545 | info = tmp; |
| 3546 | goto have_info; |
| 3547 | } |
| 3548 | |
| 3549 | n = rb_next(&info->offset_index); |
| 3550 | while (n) { |
| 3551 | tmp = rb_entry(n, struct btrfs_free_space, |
| 3552 | offset_index); |
| 3553 | if (offset + bytes < tmp->offset) |
| 3554 | break; |
| 3555 | if (tmp->offset + tmp->bytes < offset) { |
| 3556 | n = rb_next(&info->offset_index); |
| 3557 | continue; |
| 3558 | } |
| 3559 | info = tmp; |
| 3560 | goto have_info; |
| 3561 | } |
| 3562 | |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 3563 | ret = 0; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3564 | goto out; |
| 3565 | } |
| 3566 | |
| 3567 | if (info->offset == offset) { |
| 3568 | ret = 1; |
| 3569 | goto out; |
| 3570 | } |
| 3571 | |
| 3572 | if (offset > info->offset && offset < info->offset + info->bytes) |
| 3573 | ret = 1; |
| 3574 | out: |
| 3575 | spin_unlock(&ctl->tree_lock); |
| 3576 | return ret; |
| 3577 | } |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3578 | #endif /* CONFIG_BTRFS_FS_RUN_SANITY_TESTS */ |