David Sterba | c1d7c51 | 2018-04-03 19:23:33 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2007 Oracle. All rights reserved. |
Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 4 | */ |
| 5 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6 | #include <linux/fs.h> |
| 7 | #include <linux/pagemap.h> |
| 8 | #include <linux/highmem.h> |
| 9 | #include <linux/time.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/string.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 12 | #include <linux/backing-dev.h> |
| 13 | #include <linux/mpage.h> |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 14 | #include <linux/falloc.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 15 | #include <linux/swap.h> |
| 16 | #include <linux/writeback.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 17 | #include <linux/compat.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 18 | #include <linux/slab.h> |
Filipe Brandenburger | 55e301f | 2013-01-29 06:04:50 +0000 | [diff] [blame] | 19 | #include <linux/btrfs.h> |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 20 | #include <linux/uio.h> |
Jeff Layton | ae5e165 | 2018-01-29 06:41:30 -0500 | [diff] [blame] | 21 | #include <linux/iversion.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 22 | #include "ctree.h" |
| 23 | #include "disk-io.h" |
| 24 | #include "transaction.h" |
| 25 | #include "btrfs_inode.h" |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 26 | #include "print-tree.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 27 | #include "tree-log.h" |
| 28 | #include "locking.h" |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 29 | #include "volumes.h" |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 30 | #include "qgroup.h" |
Anand Jain | ebb8765 | 2016-03-10 17:26:59 +0800 | [diff] [blame] | 31 | #include "compression.h" |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 32 | |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 33 | static struct kmem_cache *btrfs_inode_defrag_cachep; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 34 | /* |
| 35 | * when auto defrag is enabled we |
| 36 | * queue up these defrag structs to remember which |
| 37 | * inodes need defragging passes |
| 38 | */ |
| 39 | struct inode_defrag { |
| 40 | struct rb_node rb_node; |
| 41 | /* objectid */ |
| 42 | u64 ino; |
| 43 | /* |
| 44 | * transid where the defrag was added, we search for |
| 45 | * extents newer than this |
| 46 | */ |
| 47 | u64 transid; |
| 48 | |
| 49 | /* root objectid */ |
| 50 | u64 root; |
| 51 | |
| 52 | /* last offset we were able to defrag */ |
| 53 | u64 last_offset; |
| 54 | |
| 55 | /* if we've wrapped around back to zero once already */ |
| 56 | int cycled; |
| 57 | }; |
| 58 | |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 59 | static int __compare_inode_defrag(struct inode_defrag *defrag1, |
| 60 | struct inode_defrag *defrag2) |
| 61 | { |
| 62 | if (defrag1->root > defrag2->root) |
| 63 | return 1; |
| 64 | else if (defrag1->root < defrag2->root) |
| 65 | return -1; |
| 66 | else if (defrag1->ino > defrag2->ino) |
| 67 | return 1; |
| 68 | else if (defrag1->ino < defrag2->ino) |
| 69 | return -1; |
| 70 | else |
| 71 | return 0; |
| 72 | } |
| 73 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 74 | /* pop a record for an inode into the defrag tree. The lock |
| 75 | * must be held already |
| 76 | * |
| 77 | * If you're inserting a record for an older transid than an |
| 78 | * existing record, the transid already in the tree is lowered |
| 79 | * |
| 80 | * If an existing record is found the defrag item you |
| 81 | * pass in is freed |
| 82 | */ |
Nikolay Borisov | 6158e1c | 2017-02-20 13:50:43 +0200 | [diff] [blame] | 83 | static int __btrfs_add_inode_defrag(struct btrfs_inode *inode, |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 84 | struct inode_defrag *defrag) |
| 85 | { |
Nikolay Borisov | 6158e1c | 2017-02-20 13:50:43 +0200 | [diff] [blame] | 86 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 87 | struct inode_defrag *entry; |
| 88 | struct rb_node **p; |
| 89 | struct rb_node *parent = NULL; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 90 | int ret; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 91 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 92 | p = &fs_info->defrag_inodes.rb_node; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 93 | while (*p) { |
| 94 | parent = *p; |
| 95 | entry = rb_entry(parent, struct inode_defrag, rb_node); |
| 96 | |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 97 | ret = __compare_inode_defrag(defrag, entry); |
| 98 | if (ret < 0) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 99 | p = &parent->rb_left; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 100 | else if (ret > 0) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 101 | p = &parent->rb_right; |
| 102 | else { |
| 103 | /* if we're reinserting an entry for |
| 104 | * an old defrag run, make sure to |
| 105 | * lower the transid of our existing record |
| 106 | */ |
| 107 | if (defrag->transid < entry->transid) |
| 108 | entry->transid = defrag->transid; |
| 109 | if (defrag->last_offset > entry->last_offset) |
| 110 | entry->last_offset = defrag->last_offset; |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 111 | return -EEXIST; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 112 | } |
| 113 | } |
Nikolay Borisov | 6158e1c | 2017-02-20 13:50:43 +0200 | [diff] [blame] | 114 | set_bit(BTRFS_INODE_IN_DEFRAG, &inode->runtime_flags); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 115 | rb_link_node(&defrag->rb_node, parent, p); |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 116 | rb_insert_color(&defrag->rb_node, &fs_info->defrag_inodes); |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 117 | return 0; |
| 118 | } |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 119 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 120 | static inline int __need_auto_defrag(struct btrfs_fs_info *fs_info) |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 121 | { |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 122 | if (!btrfs_test_opt(fs_info, AUTO_DEFRAG)) |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 123 | return 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 124 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 125 | if (btrfs_fs_closing(fs_info)) |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 126 | return 0; |
| 127 | |
| 128 | return 1; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 129 | } |
| 130 | |
| 131 | /* |
| 132 | * insert a defrag record for this inode if auto defrag is |
| 133 | * enabled |
| 134 | */ |
| 135 | int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, |
Nikolay Borisov | 6158e1c | 2017-02-20 13:50:43 +0200 | [diff] [blame] | 136 | struct btrfs_inode *inode) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 137 | { |
Nikolay Borisov | 6158e1c | 2017-02-20 13:50:43 +0200 | [diff] [blame] | 138 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb); |
| 139 | struct btrfs_root *root = inode->root; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 140 | struct inode_defrag *defrag; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 141 | u64 transid; |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 142 | int ret; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 143 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 144 | if (!__need_auto_defrag(fs_info)) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 145 | return 0; |
| 146 | |
Nikolay Borisov | 6158e1c | 2017-02-20 13:50:43 +0200 | [diff] [blame] | 147 | if (test_bit(BTRFS_INODE_IN_DEFRAG, &inode->runtime_flags)) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 148 | return 0; |
| 149 | |
| 150 | if (trans) |
| 151 | transid = trans->transid; |
| 152 | else |
Nikolay Borisov | 6158e1c | 2017-02-20 13:50:43 +0200 | [diff] [blame] | 153 | transid = inode->root->last_trans; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 154 | |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 155 | defrag = kmem_cache_zalloc(btrfs_inode_defrag_cachep, GFP_NOFS); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 156 | if (!defrag) |
| 157 | return -ENOMEM; |
| 158 | |
Nikolay Borisov | 6158e1c | 2017-02-20 13:50:43 +0200 | [diff] [blame] | 159 | defrag->ino = btrfs_ino(inode); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 160 | defrag->transid = transid; |
| 161 | defrag->root = root->root_key.objectid; |
| 162 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 163 | spin_lock(&fs_info->defrag_inodes_lock); |
Nikolay Borisov | 6158e1c | 2017-02-20 13:50:43 +0200 | [diff] [blame] | 164 | if (!test_bit(BTRFS_INODE_IN_DEFRAG, &inode->runtime_flags)) { |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 165 | /* |
| 166 | * If we set IN_DEFRAG flag and evict the inode from memory, |
| 167 | * and then re-read this inode, this new inode doesn't have |
| 168 | * IN_DEFRAG flag. At the case, we may find the existed defrag. |
| 169 | */ |
| 170 | ret = __btrfs_add_inode_defrag(inode, defrag); |
| 171 | if (ret) |
| 172 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
| 173 | } else { |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 174 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 175 | } |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 176 | spin_unlock(&fs_info->defrag_inodes_lock); |
Wanlong Gao | a0f98dd | 2011-07-18 12:19:35 +0000 | [diff] [blame] | 177 | return 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 178 | } |
| 179 | |
| 180 | /* |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 181 | * Requeue the defrag object. If there is a defrag object that points to |
| 182 | * the same inode in the tree, we will merge them together (by |
| 183 | * __btrfs_add_inode_defrag()) and free the one that we want to requeue. |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 184 | */ |
Nikolay Borisov | 46e5979 | 2017-02-20 13:50:44 +0200 | [diff] [blame] | 185 | static void btrfs_requeue_inode_defrag(struct btrfs_inode *inode, |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 186 | struct inode_defrag *defrag) |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 187 | { |
Nikolay Borisov | 46e5979 | 2017-02-20 13:50:44 +0200 | [diff] [blame] | 188 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb); |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 189 | int ret; |
| 190 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 191 | if (!__need_auto_defrag(fs_info)) |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 192 | goto out; |
| 193 | |
| 194 | /* |
| 195 | * Here we don't check the IN_DEFRAG flag, because we need merge |
| 196 | * them together. |
| 197 | */ |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 198 | spin_lock(&fs_info->defrag_inodes_lock); |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 199 | ret = __btrfs_add_inode_defrag(inode, defrag); |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 200 | spin_unlock(&fs_info->defrag_inodes_lock); |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 201 | if (ret) |
| 202 | goto out; |
| 203 | return; |
| 204 | out: |
| 205 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
| 206 | } |
| 207 | |
| 208 | /* |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 209 | * pick the defragable inode that we want, if it doesn't exist, we will get |
| 210 | * the next one. |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 211 | */ |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 212 | static struct inode_defrag * |
| 213 | btrfs_pick_defrag_inode(struct btrfs_fs_info *fs_info, u64 root, u64 ino) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 214 | { |
| 215 | struct inode_defrag *entry = NULL; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 216 | struct inode_defrag tmp; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 217 | struct rb_node *p; |
| 218 | struct rb_node *parent = NULL; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 219 | int ret; |
| 220 | |
| 221 | tmp.ino = ino; |
| 222 | tmp.root = root; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 223 | |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 224 | spin_lock(&fs_info->defrag_inodes_lock); |
| 225 | p = fs_info->defrag_inodes.rb_node; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 226 | while (p) { |
| 227 | parent = p; |
| 228 | entry = rb_entry(parent, struct inode_defrag, rb_node); |
| 229 | |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 230 | ret = __compare_inode_defrag(&tmp, entry); |
| 231 | if (ret < 0) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 232 | p = parent->rb_left; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 233 | else if (ret > 0) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 234 | p = parent->rb_right; |
| 235 | else |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 236 | goto out; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 237 | } |
| 238 | |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 239 | if (parent && __compare_inode_defrag(&tmp, entry) > 0) { |
| 240 | parent = rb_next(parent); |
| 241 | if (parent) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 242 | entry = rb_entry(parent, struct inode_defrag, rb_node); |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 243 | else |
| 244 | entry = NULL; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 245 | } |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 246 | out: |
| 247 | if (entry) |
| 248 | rb_erase(parent, &fs_info->defrag_inodes); |
| 249 | spin_unlock(&fs_info->defrag_inodes_lock); |
| 250 | return entry; |
| 251 | } |
| 252 | |
| 253 | void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info) |
| 254 | { |
| 255 | struct inode_defrag *defrag; |
| 256 | struct rb_node *node; |
| 257 | |
| 258 | spin_lock(&fs_info->defrag_inodes_lock); |
| 259 | node = rb_first(&fs_info->defrag_inodes); |
| 260 | while (node) { |
| 261 | rb_erase(node, &fs_info->defrag_inodes); |
| 262 | defrag = rb_entry(node, struct inode_defrag, rb_node); |
| 263 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
| 264 | |
David Sterba | 351810c | 2015-01-08 15:20:54 +0100 | [diff] [blame] | 265 | cond_resched_lock(&fs_info->defrag_inodes_lock); |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 266 | |
| 267 | node = rb_first(&fs_info->defrag_inodes); |
| 268 | } |
| 269 | spin_unlock(&fs_info->defrag_inodes_lock); |
| 270 | } |
| 271 | |
| 272 | #define BTRFS_DEFRAG_BATCH 1024 |
| 273 | |
| 274 | static int __btrfs_run_defrag_inode(struct btrfs_fs_info *fs_info, |
| 275 | struct inode_defrag *defrag) |
| 276 | { |
| 277 | struct btrfs_root *inode_root; |
| 278 | struct inode *inode; |
| 279 | struct btrfs_key key; |
| 280 | struct btrfs_ioctl_defrag_range_args range; |
| 281 | int num_defrag; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 282 | int index; |
| 283 | int ret; |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 284 | |
| 285 | /* get the inode */ |
| 286 | key.objectid = defrag->root; |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 287 | key.type = BTRFS_ROOT_ITEM_KEY; |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 288 | key.offset = (u64)-1; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 289 | |
| 290 | index = srcu_read_lock(&fs_info->subvol_srcu); |
| 291 | |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 292 | inode_root = btrfs_read_fs_root_no_name(fs_info, &key); |
| 293 | if (IS_ERR(inode_root)) { |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 294 | ret = PTR_ERR(inode_root); |
| 295 | goto cleanup; |
| 296 | } |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 297 | |
| 298 | key.objectid = defrag->ino; |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 299 | key.type = BTRFS_INODE_ITEM_KEY; |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 300 | key.offset = 0; |
| 301 | inode = btrfs_iget(fs_info->sb, &key, inode_root, NULL); |
| 302 | if (IS_ERR(inode)) { |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 303 | ret = PTR_ERR(inode); |
| 304 | goto cleanup; |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 305 | } |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 306 | srcu_read_unlock(&fs_info->subvol_srcu, index); |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 307 | |
| 308 | /* do a chunk of defrag */ |
| 309 | clear_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags); |
| 310 | memset(&range, 0, sizeof(range)); |
| 311 | range.len = (u64)-1; |
| 312 | range.start = defrag->last_offset; |
Miao Xie | b66f00d | 2012-11-26 09:27:29 +0000 | [diff] [blame] | 313 | |
| 314 | sb_start_write(fs_info->sb); |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 315 | num_defrag = btrfs_defrag_file(inode, NULL, &range, defrag->transid, |
| 316 | BTRFS_DEFRAG_BATCH); |
Miao Xie | b66f00d | 2012-11-26 09:27:29 +0000 | [diff] [blame] | 317 | sb_end_write(fs_info->sb); |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 318 | /* |
| 319 | * if we filled the whole defrag batch, there |
| 320 | * must be more work to do. Queue this defrag |
| 321 | * again |
| 322 | */ |
| 323 | if (num_defrag == BTRFS_DEFRAG_BATCH) { |
| 324 | defrag->last_offset = range.start; |
Nikolay Borisov | 46e5979 | 2017-02-20 13:50:44 +0200 | [diff] [blame] | 325 | btrfs_requeue_inode_defrag(BTRFS_I(inode), defrag); |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 326 | } else if (defrag->last_offset && !defrag->cycled) { |
| 327 | /* |
| 328 | * we didn't fill our defrag batch, but |
| 329 | * we didn't start at zero. Make sure we loop |
| 330 | * around to the start of the file. |
| 331 | */ |
| 332 | defrag->last_offset = 0; |
| 333 | defrag->cycled = 1; |
Nikolay Borisov | 46e5979 | 2017-02-20 13:50:44 +0200 | [diff] [blame] | 334 | btrfs_requeue_inode_defrag(BTRFS_I(inode), defrag); |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 335 | } else { |
| 336 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
| 337 | } |
| 338 | |
| 339 | iput(inode); |
| 340 | return 0; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 341 | cleanup: |
| 342 | srcu_read_unlock(&fs_info->subvol_srcu, index); |
| 343 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
| 344 | return ret; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | /* |
| 348 | * run through the list of inodes in the FS that need |
| 349 | * defragging |
| 350 | */ |
| 351 | int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info) |
| 352 | { |
| 353 | struct inode_defrag *defrag; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 354 | u64 first_ino = 0; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 355 | u64 root_objectid = 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 356 | |
| 357 | atomic_inc(&fs_info->defrag_running); |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 358 | while (1) { |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 359 | /* Pause the auto defragger. */ |
| 360 | if (test_bit(BTRFS_FS_STATE_REMOUNTING, |
| 361 | &fs_info->fs_state)) |
| 362 | break; |
| 363 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 364 | if (!__need_auto_defrag(fs_info)) |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 365 | break; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 366 | |
| 367 | /* find an inode to defrag */ |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 368 | defrag = btrfs_pick_defrag_inode(fs_info, root_objectid, |
| 369 | first_ino); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 370 | if (!defrag) { |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 371 | if (root_objectid || first_ino) { |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 372 | root_objectid = 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 373 | first_ino = 0; |
| 374 | continue; |
| 375 | } else { |
| 376 | break; |
| 377 | } |
| 378 | } |
| 379 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 380 | first_ino = defrag->ino + 1; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 381 | root_objectid = defrag->root; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 382 | |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 383 | __btrfs_run_defrag_inode(fs_info, defrag); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 384 | } |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 385 | atomic_dec(&fs_info->defrag_running); |
| 386 | |
| 387 | /* |
| 388 | * during unmount, we use the transaction_wait queue to |
| 389 | * wait for the defragger to stop |
| 390 | */ |
| 391 | wake_up(&fs_info->transaction_wait); |
| 392 | return 0; |
| 393 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 394 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 395 | /* simple helper to fault in pages and copy. This should go away |
| 396 | * and be replaced with calls into generic code. |
| 397 | */ |
Zhao Lei | ee22f0c | 2016-01-06 18:47:31 +0800 | [diff] [blame] | 398 | static noinline int btrfs_copy_from_user(loff_t pos, size_t write_bytes, |
Chris Mason | a1b32a5 | 2008-09-05 16:09:51 -0400 | [diff] [blame] | 399 | struct page **prepared_pages, |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 400 | struct iov_iter *i) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 401 | { |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 402 | size_t copied = 0; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 403 | size_t total_copied = 0; |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 404 | int pg = 0; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 405 | int offset = pos & (PAGE_SIZE - 1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 406 | |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 407 | while (write_bytes > 0) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 408 | size_t count = min_t(size_t, |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 409 | PAGE_SIZE - offset, write_bytes); |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 410 | struct page *page = prepared_pages[pg]; |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 411 | /* |
| 412 | * Copy data from userspace to the current page |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 413 | */ |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 414 | copied = iov_iter_copy_from_user_atomic(page, i, offset, count); |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 415 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 416 | /* Flush processor's dcache for this page */ |
| 417 | flush_dcache_page(page); |
Chris Mason | 31339ac | 2011-03-07 11:10:24 -0500 | [diff] [blame] | 418 | |
| 419 | /* |
| 420 | * if we get a partial write, we can end up with |
| 421 | * partially up to date pages. These add |
| 422 | * a lot of complexity, so make sure they don't |
| 423 | * happen by forcing this copy to be retried. |
| 424 | * |
| 425 | * The rest of the btrfs_file_write code will fall |
| 426 | * back to page at a time copies after we return 0. |
| 427 | */ |
| 428 | if (!PageUptodate(page) && copied < count) |
| 429 | copied = 0; |
| 430 | |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 431 | iov_iter_advance(i, copied); |
| 432 | write_bytes -= copied; |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 433 | total_copied += copied; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 434 | |
Al Viro | b30ac0f | 2014-04-03 14:29:04 -0400 | [diff] [blame] | 435 | /* Return to btrfs_file_write_iter to fault page */ |
Josef Bacik | 9f570b8 | 2011-01-25 12:42:37 -0500 | [diff] [blame] | 436 | if (unlikely(copied == 0)) |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 437 | break; |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 438 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 439 | if (copied < PAGE_SIZE - offset) { |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 440 | offset += copied; |
| 441 | } else { |
| 442 | pg++; |
| 443 | offset = 0; |
| 444 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 445 | } |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 446 | return total_copied; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 447 | } |
| 448 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 449 | /* |
| 450 | * unlocks pages after btrfs_file_write is done with them |
| 451 | */ |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 452 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 453 | { |
| 454 | size_t i; |
| 455 | for (i = 0; i < num_pages; i++) { |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 456 | /* page checked is some magic around finding pages that |
| 457 | * have been modified without going through btrfs_set_page_dirty |
Mel Gorman | 2457aec | 2014-06-04 16:10:31 -0700 | [diff] [blame] | 458 | * clear it here. There should be no need to mark the pages |
| 459 | * accessed as prepare_pages should have marked them accessed |
| 460 | * in prepare_pages via find_or_create_page() |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 461 | */ |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 462 | ClearPageChecked(pages[i]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 463 | unlock_page(pages[i]); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 464 | put_page(pages[i]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 465 | } |
| 466 | } |
| 467 | |
Filipe Manana | f48bf66 | 2017-11-03 22:26:44 +0000 | [diff] [blame] | 468 | static int btrfs_find_new_delalloc_bytes(struct btrfs_inode *inode, |
| 469 | const u64 start, |
| 470 | const u64 len, |
| 471 | struct extent_state **cached_state) |
| 472 | { |
| 473 | u64 search_start = start; |
| 474 | const u64 end = start + len - 1; |
| 475 | |
| 476 | while (search_start < end) { |
| 477 | const u64 search_len = end - search_start + 1; |
| 478 | struct extent_map *em; |
| 479 | u64 em_len; |
| 480 | int ret = 0; |
| 481 | |
| 482 | em = btrfs_get_extent(inode, NULL, 0, search_start, |
| 483 | search_len, 0); |
| 484 | if (IS_ERR(em)) |
| 485 | return PTR_ERR(em); |
| 486 | |
| 487 | if (em->block_start != EXTENT_MAP_HOLE) |
| 488 | goto next; |
| 489 | |
| 490 | em_len = em->len; |
| 491 | if (em->start < search_start) |
| 492 | em_len -= search_start - em->start; |
| 493 | if (em_len > search_len) |
| 494 | em_len = search_len; |
| 495 | |
| 496 | ret = set_extent_bit(&inode->io_tree, search_start, |
| 497 | search_start + em_len - 1, |
| 498 | EXTENT_DELALLOC_NEW, |
| 499 | NULL, cached_state, GFP_NOFS); |
| 500 | next: |
| 501 | search_start = extent_map_end(em); |
| 502 | free_extent_map(em); |
| 503 | if (ret) |
| 504 | return ret; |
| 505 | } |
| 506 | return 0; |
| 507 | } |
| 508 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 509 | /* |
| 510 | * after copy_from_user, pages need to be dirtied and we need to make |
| 511 | * sure holes are created between the current EOF and the start of |
| 512 | * any next extents (if required). |
| 513 | * |
| 514 | * this also makes the decision about creating an inline extent vs |
| 515 | * doing real data extents, marking pages dirty and delalloc as required. |
| 516 | */ |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 517 | int btrfs_dirty_pages(struct inode *inode, struct page **pages, |
| 518 | size_t num_pages, loff_t pos, size_t write_bytes, |
| 519 | struct extent_state **cached) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 520 | { |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 521 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 522 | int err = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 523 | int i; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 524 | u64 num_bytes; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 525 | u64 start_pos; |
| 526 | u64 end_of_last_block; |
| 527 | u64 end_pos = pos + write_bytes; |
| 528 | loff_t isize = i_size_read(inode); |
Filipe Manana | e3b8a48 | 2017-11-04 00:16:59 +0000 | [diff] [blame] | 529 | unsigned int extra_bits = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 530 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 531 | start_pos = pos & ~((u64) fs_info->sectorsize - 1); |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 532 | num_bytes = round_up(write_bytes + pos - start_pos, |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 533 | fs_info->sectorsize); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 534 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 535 | end_of_last_block = start_pos + num_bytes - 1; |
Filipe Manana | e3b8a48 | 2017-11-04 00:16:59 +0000 | [diff] [blame] | 536 | |
| 537 | if (!btrfs_is_free_space_inode(BTRFS_I(inode))) { |
| 538 | if (start_pos >= isize && |
| 539 | !(BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC)) { |
| 540 | /* |
| 541 | * There can't be any extents following eof in this case |
| 542 | * so just set the delalloc new bit for the range |
| 543 | * directly. |
| 544 | */ |
| 545 | extra_bits |= EXTENT_DELALLOC_NEW; |
| 546 | } else { |
| 547 | err = btrfs_find_new_delalloc_bytes(BTRFS_I(inode), |
| 548 | start_pos, |
| 549 | num_bytes, cached); |
| 550 | if (err) |
| 551 | return err; |
| 552 | } |
| 553 | } |
| 554 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 555 | err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block, |
Filipe Manana | e3b8a48 | 2017-11-04 00:16:59 +0000 | [diff] [blame] | 556 | extra_bits, cached, 0); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 557 | if (err) |
| 558 | return err; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 559 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 560 | for (i = 0; i < num_pages; i++) { |
| 561 | struct page *p = pages[i]; |
| 562 | SetPageUptodate(p); |
| 563 | ClearPageChecked(p); |
| 564 | set_page_dirty(p); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 565 | } |
Josef Bacik | 9f570b8 | 2011-01-25 12:42:37 -0500 | [diff] [blame] | 566 | |
| 567 | /* |
| 568 | * we've only changed i_size in ram, and we haven't updated |
| 569 | * the disk i_size. There is no need to log the inode |
| 570 | * at this time. |
| 571 | */ |
| 572 | if (end_pos > isize) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 573 | i_size_write(inode, end_pos); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 574 | return 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 575 | } |
| 576 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 577 | /* |
| 578 | * this drops all the extents in the cache that intersect the range |
| 579 | * [start, end]. Existing extents are split as required. |
| 580 | */ |
Nikolay Borisov | dcdbc05 | 2017-02-20 13:50:45 +0200 | [diff] [blame] | 581 | void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end, |
Josef Bacik | 7014cdb | 2012-08-30 20:06:49 -0400 | [diff] [blame] | 582 | int skip_pinned) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 583 | { |
| 584 | struct extent_map *em; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 585 | struct extent_map *split = NULL; |
| 586 | struct extent_map *split2 = NULL; |
Nikolay Borisov | dcdbc05 | 2017-02-20 13:50:45 +0200 | [diff] [blame] | 587 | struct extent_map_tree *em_tree = &inode->extent_tree; |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 588 | u64 len = end - start + 1; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 589 | u64 gen; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 590 | int ret; |
| 591 | int testend = 1; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 592 | unsigned long flags; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 593 | int compressed = 0; |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 594 | bool modified; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 595 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 596 | WARN_ON(end < start); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 597 | if (end == (u64)-1) { |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 598 | len = (u64)-1; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 599 | testend = 0; |
| 600 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 601 | while (1) { |
Josef Bacik | 7014cdb | 2012-08-30 20:06:49 -0400 | [diff] [blame] | 602 | int no_splits = 0; |
| 603 | |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 604 | modified = false; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 605 | if (!split) |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 606 | split = alloc_extent_map(); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 607 | if (!split2) |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 608 | split2 = alloc_extent_map(); |
Josef Bacik | 7014cdb | 2012-08-30 20:06:49 -0400 | [diff] [blame] | 609 | if (!split || !split2) |
| 610 | no_splits = 1; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 611 | |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 612 | write_lock(&em_tree->lock); |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 613 | em = lookup_extent_mapping(em_tree, start, len); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 614 | if (!em) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 615 | write_unlock(&em_tree->lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 616 | break; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 617 | } |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 618 | flags = em->flags; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 619 | gen = em->generation; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 620 | if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) { |
Yan, Zheng | 55ef689 | 2009-11-12 09:36:44 +0000 | [diff] [blame] | 621 | if (testend && em->start + em->len >= start + len) { |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 622 | free_extent_map(em); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 623 | write_unlock(&em_tree->lock); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 624 | break; |
| 625 | } |
Yan, Zheng | 55ef689 | 2009-11-12 09:36:44 +0000 | [diff] [blame] | 626 | start = em->start + em->len; |
| 627 | if (testend) |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 628 | len = start + len - (em->start + em->len); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 629 | free_extent_map(em); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 630 | write_unlock(&em_tree->lock); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 631 | continue; |
| 632 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 633 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
Chris Mason | 3ce7e67 | 2008-07-31 15:42:54 -0400 | [diff] [blame] | 634 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); |
Liu Bo | 3b27759 | 2013-03-15 08:46:39 -0600 | [diff] [blame] | 635 | clear_bit(EXTENT_FLAG_LOGGING, &flags); |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 636 | modified = !list_empty(&em->list); |
Josef Bacik | 7014cdb | 2012-08-30 20:06:49 -0400 | [diff] [blame] | 637 | if (no_splits) |
| 638 | goto next; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 639 | |
Josef Bacik | ee20a98 | 2013-07-11 10:34:59 -0400 | [diff] [blame] | 640 | if (em->start < start) { |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 641 | split->start = em->start; |
| 642 | split->len = start - em->start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 643 | |
Josef Bacik | ee20a98 | 2013-07-11 10:34:59 -0400 | [diff] [blame] | 644 | if (em->block_start < EXTENT_MAP_LAST_BYTE) { |
| 645 | split->orig_start = em->orig_start; |
| 646 | split->block_start = em->block_start; |
| 647 | |
| 648 | if (compressed) |
| 649 | split->block_len = em->block_len; |
| 650 | else |
| 651 | split->block_len = split->len; |
| 652 | split->orig_block_len = max(split->block_len, |
| 653 | em->orig_block_len); |
| 654 | split->ram_bytes = em->ram_bytes; |
| 655 | } else { |
| 656 | split->orig_start = split->start; |
| 657 | split->block_len = 0; |
| 658 | split->block_start = em->block_start; |
| 659 | split->orig_block_len = 0; |
| 660 | split->ram_bytes = split->len; |
| 661 | } |
| 662 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 663 | split->generation = gen; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 664 | split->bdev = em->bdev; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 665 | split->flags = flags; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 666 | split->compress_type = em->compress_type; |
Filipe Manana | 176840b | 2014-02-25 14:15:13 +0000 | [diff] [blame] | 667 | replace_extent_mapping(em_tree, em, split, modified); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 668 | free_extent_map(split); |
| 669 | split = split2; |
| 670 | split2 = NULL; |
| 671 | } |
Josef Bacik | ee20a98 | 2013-07-11 10:34:59 -0400 | [diff] [blame] | 672 | if (testend && em->start + em->len > start + len) { |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 673 | u64 diff = start + len - em->start; |
| 674 | |
| 675 | split->start = start + len; |
| 676 | split->len = em->start + em->len - (start + len); |
| 677 | split->bdev = em->bdev; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 678 | split->flags = flags; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 679 | split->compress_type = em->compress_type; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 680 | split->generation = gen; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 681 | |
Josef Bacik | ee20a98 | 2013-07-11 10:34:59 -0400 | [diff] [blame] | 682 | if (em->block_start < EXTENT_MAP_LAST_BYTE) { |
| 683 | split->orig_block_len = max(em->block_len, |
| 684 | em->orig_block_len); |
| 685 | |
| 686 | split->ram_bytes = em->ram_bytes; |
| 687 | if (compressed) { |
| 688 | split->block_len = em->block_len; |
| 689 | split->block_start = em->block_start; |
| 690 | split->orig_start = em->orig_start; |
| 691 | } else { |
| 692 | split->block_len = split->len; |
| 693 | split->block_start = em->block_start |
| 694 | + diff; |
| 695 | split->orig_start = em->orig_start; |
| 696 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 697 | } else { |
Josef Bacik | ee20a98 | 2013-07-11 10:34:59 -0400 | [diff] [blame] | 698 | split->ram_bytes = split->len; |
| 699 | split->orig_start = split->start; |
| 700 | split->block_len = 0; |
| 701 | split->block_start = em->block_start; |
| 702 | split->orig_block_len = 0; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 703 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 704 | |
Filipe Manana | 176840b | 2014-02-25 14:15:13 +0000 | [diff] [blame] | 705 | if (extent_map_in_tree(em)) { |
| 706 | replace_extent_mapping(em_tree, em, split, |
| 707 | modified); |
| 708 | } else { |
| 709 | ret = add_extent_mapping(em_tree, split, |
| 710 | modified); |
| 711 | ASSERT(ret == 0); /* Logic error */ |
| 712 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 713 | free_extent_map(split); |
| 714 | split = NULL; |
| 715 | } |
Josef Bacik | 7014cdb | 2012-08-30 20:06:49 -0400 | [diff] [blame] | 716 | next: |
Filipe Manana | 176840b | 2014-02-25 14:15:13 +0000 | [diff] [blame] | 717 | if (extent_map_in_tree(em)) |
| 718 | remove_extent_mapping(em_tree, em); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 719 | write_unlock(&em_tree->lock); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 720 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 721 | /* once for us */ |
| 722 | free_extent_map(em); |
| 723 | /* once for the tree*/ |
| 724 | free_extent_map(em); |
| 725 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 726 | if (split) |
| 727 | free_extent_map(split); |
| 728 | if (split2) |
| 729 | free_extent_map(split2); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 730 | } |
| 731 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 732 | /* |
| 733 | * this is very complex, but the basic idea is to drop all extents |
| 734 | * in the range start - end. hint_block is filled in with a block number |
| 735 | * that would be a good hint to the block allocator for this file. |
| 736 | * |
| 737 | * If an extent intersects the range but is not entirely inside the range |
| 738 | * it is either truncated or split. Anything entirely inside the range |
| 739 | * is deleted from the tree. |
| 740 | */ |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 741 | int __btrfs_drop_extents(struct btrfs_trans_handle *trans, |
| 742 | struct btrfs_root *root, struct inode *inode, |
| 743 | struct btrfs_path *path, u64 start, u64 end, |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 744 | u64 *drop_end, int drop_cache, |
| 745 | int replace_extent, |
| 746 | u32 extent_item_size, |
| 747 | int *key_inserted) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 748 | { |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 749 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 750 | struct extent_buffer *leaf; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 751 | struct btrfs_file_extent_item *fi; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 752 | struct btrfs_key key; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 753 | struct btrfs_key new_key; |
Nikolay Borisov | 4a0cc7c | 2017-01-10 20:35:31 +0200 | [diff] [blame] | 754 | u64 ino = btrfs_ino(BTRFS_I(inode)); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 755 | u64 search_start = start; |
| 756 | u64 disk_bytenr = 0; |
| 757 | u64 num_bytes = 0; |
| 758 | u64 extent_offset = 0; |
| 759 | u64 extent_end = 0; |
Josef Bacik | 62fe51c | 2016-11-16 09:13:39 -0500 | [diff] [blame] | 760 | u64 last_end = start; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 761 | int del_nr = 0; |
| 762 | int del_slot = 0; |
| 763 | int extent_type; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 764 | int recow; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 765 | int ret; |
Chris Mason | dc7fdde | 2012-04-27 14:31:29 -0400 | [diff] [blame] | 766 | int modify_tree = -1; |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 767 | int update_refs; |
Josef Bacik | c3308f8 | 2012-09-14 14:51:22 -0400 | [diff] [blame] | 768 | int found = 0; |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 769 | int leafs_visited = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 770 | |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 771 | if (drop_cache) |
Nikolay Borisov | dcdbc05 | 2017-02-20 13:50:45 +0200 | [diff] [blame] | 772 | btrfs_drop_extent_cache(BTRFS_I(inode), start, end - 1, 0); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 773 | |
Filipe David Borba Manana | d5f3752 | 2014-02-09 23:45:12 +0000 | [diff] [blame] | 774 | if (start >= BTRFS_I(inode)->disk_i_size && !replace_extent) |
Chris Mason | dc7fdde | 2012-04-27 14:31:29 -0400 | [diff] [blame] | 775 | modify_tree = 0; |
| 776 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 777 | update_refs = (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 778 | root == fs_info->tree_root); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 779 | while (1) { |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 780 | recow = 0; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 781 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
Chris Mason | dc7fdde | 2012-04-27 14:31:29 -0400 | [diff] [blame] | 782 | search_start, modify_tree); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 783 | if (ret < 0) |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 784 | break; |
| 785 | if (ret > 0 && path->slots[0] > 0 && search_start == start) { |
| 786 | leaf = path->nodes[0]; |
| 787 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 788 | if (key.objectid == ino && |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 789 | key.type == BTRFS_EXTENT_DATA_KEY) |
| 790 | path->slots[0]--; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 791 | } |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 792 | ret = 0; |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 793 | leafs_visited++; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 794 | next_slot: |
| 795 | leaf = path->nodes[0]; |
| 796 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 797 | BUG_ON(del_nr > 0); |
| 798 | ret = btrfs_next_leaf(root, path); |
| 799 | if (ret < 0) |
| 800 | break; |
| 801 | if (ret > 0) { |
| 802 | ret = 0; |
| 803 | break; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 804 | } |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 805 | leafs_visited++; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 806 | leaf = path->nodes[0]; |
| 807 | recow = 1; |
| 808 | } |
| 809 | |
| 810 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Filipe Manana | aeafbf8 | 2015-11-06 13:33:33 +0000 | [diff] [blame] | 811 | |
| 812 | if (key.objectid > ino) |
| 813 | break; |
| 814 | if (WARN_ON_ONCE(key.objectid < ino) || |
| 815 | key.type < BTRFS_EXTENT_DATA_KEY) { |
| 816 | ASSERT(del_nr == 0); |
| 817 | path->slots[0]++; |
| 818 | goto next_slot; |
| 819 | } |
| 820 | if (key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end) |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 821 | break; |
| 822 | |
| 823 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 824 | struct btrfs_file_extent_item); |
| 825 | extent_type = btrfs_file_extent_type(leaf, fi); |
| 826 | |
| 827 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
| 828 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
| 829 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 830 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
| 831 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
| 832 | extent_end = key.offset + |
| 833 | btrfs_file_extent_num_bytes(leaf, fi); |
| 834 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
| 835 | extent_end = key.offset + |
Qu Wenruo | e41ca58 | 2018-06-06 15:41:49 +0800 | [diff] [blame^] | 836 | btrfs_file_extent_ram_bytes(leaf, fi); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 837 | } else { |
Filipe Manana | aeafbf8 | 2015-11-06 13:33:33 +0000 | [diff] [blame] | 838 | /* can't happen */ |
| 839 | BUG(); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 840 | } |
| 841 | |
Filipe Manana | fc19c5e | 2014-04-29 13:18:40 +0100 | [diff] [blame] | 842 | /* |
| 843 | * Don't skip extent items representing 0 byte lengths. They |
| 844 | * used to be created (bug) if while punching holes we hit |
| 845 | * -ENOSPC condition. So if we find one here, just ensure we |
| 846 | * delete it, otherwise we would insert a new file extent item |
| 847 | * with the same key (offset) as that 0 bytes length file |
| 848 | * extent item in the call to setup_items_for_insert() later |
| 849 | * in this function. |
| 850 | */ |
Josef Bacik | 62fe51c | 2016-11-16 09:13:39 -0500 | [diff] [blame] | 851 | if (extent_end == key.offset && extent_end >= search_start) { |
| 852 | last_end = extent_end; |
Filipe Manana | fc19c5e | 2014-04-29 13:18:40 +0100 | [diff] [blame] | 853 | goto delete_extent_item; |
Josef Bacik | 62fe51c | 2016-11-16 09:13:39 -0500 | [diff] [blame] | 854 | } |
Filipe Manana | fc19c5e | 2014-04-29 13:18:40 +0100 | [diff] [blame] | 855 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 856 | if (extent_end <= search_start) { |
| 857 | path->slots[0]++; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 858 | goto next_slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 859 | } |
| 860 | |
Josef Bacik | c3308f8 | 2012-09-14 14:51:22 -0400 | [diff] [blame] | 861 | found = 1; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 862 | search_start = max(key.offset, start); |
Chris Mason | dc7fdde | 2012-04-27 14:31:29 -0400 | [diff] [blame] | 863 | if (recow || !modify_tree) { |
| 864 | modify_tree = -1; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 865 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 866 | continue; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 867 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 868 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 869 | /* |
| 870 | * | - range to drop - | |
| 871 | * | -------- extent -------- | |
| 872 | */ |
| 873 | if (start > key.offset && end < extent_end) { |
| 874 | BUG_ON(del_nr > 0); |
Liu Bo | 00fdf13 | 2014-03-10 18:56:07 +0800 | [diff] [blame] | 875 | if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
David Sterba | 3f9e3df | 2014-04-15 18:50:17 +0200 | [diff] [blame] | 876 | ret = -EOPNOTSUPP; |
Liu Bo | 00fdf13 | 2014-03-10 18:56:07 +0800 | [diff] [blame] | 877 | break; |
| 878 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 879 | |
| 880 | memcpy(&new_key, &key, sizeof(new_key)); |
| 881 | new_key.offset = start; |
| 882 | ret = btrfs_duplicate_item(trans, root, path, |
| 883 | &new_key); |
| 884 | if (ret == -EAGAIN) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 885 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 886 | continue; |
| 887 | } |
| 888 | if (ret < 0) |
| 889 | break; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 890 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 891 | leaf = path->nodes[0]; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 892 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, |
| 893 | struct btrfs_file_extent_item); |
| 894 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 895 | start - key.offset); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 896 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 897 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 898 | struct btrfs_file_extent_item); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 899 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 900 | extent_offset += start - key.offset; |
| 901 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); |
| 902 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 903 | extent_end - start); |
| 904 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 905 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 906 | if (update_refs && disk_bytenr > 0) { |
Josef Bacik | 84f7d8e | 2017-09-29 15:43:49 -0400 | [diff] [blame] | 907 | ret = btrfs_inc_extent_ref(trans, root, |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 908 | disk_bytenr, num_bytes, 0, |
| 909 | root->root_key.objectid, |
| 910 | new_key.objectid, |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 911 | start - extent_offset); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 912 | BUG_ON(ret); /* -ENOMEM */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 913 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 914 | key.offset = start; |
| 915 | } |
| 916 | /* |
Josef Bacik | 62fe51c | 2016-11-16 09:13:39 -0500 | [diff] [blame] | 917 | * From here on out we will have actually dropped something, so |
| 918 | * last_end can be updated. |
| 919 | */ |
| 920 | last_end = extent_end; |
| 921 | |
| 922 | /* |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 923 | * | ---- range to drop ----- | |
| 924 | * | -------- extent -------- | |
| 925 | */ |
| 926 | if (start <= key.offset && end < extent_end) { |
Liu Bo | 00fdf13 | 2014-03-10 18:56:07 +0800 | [diff] [blame] | 927 | if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
David Sterba | 3f9e3df | 2014-04-15 18:50:17 +0200 | [diff] [blame] | 928 | ret = -EOPNOTSUPP; |
Liu Bo | 00fdf13 | 2014-03-10 18:56:07 +0800 | [diff] [blame] | 929 | break; |
| 930 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 931 | |
| 932 | memcpy(&new_key, &key, sizeof(new_key)); |
| 933 | new_key.offset = end; |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 934 | btrfs_set_item_key_safe(fs_info, path, &new_key); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 935 | |
| 936 | extent_offset += end - key.offset; |
| 937 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); |
| 938 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 939 | extent_end - end); |
| 940 | btrfs_mark_buffer_dirty(leaf); |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 941 | if (update_refs && disk_bytenr > 0) |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 942 | inode_sub_bytes(inode, end - key.offset); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 943 | break; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 944 | } |
| 945 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 946 | search_start = extent_end; |
| 947 | /* |
| 948 | * | ---- range to drop ----- | |
| 949 | * | -------- extent -------- | |
| 950 | */ |
| 951 | if (start > key.offset && end >= extent_end) { |
| 952 | BUG_ON(del_nr > 0); |
Liu Bo | 00fdf13 | 2014-03-10 18:56:07 +0800 | [diff] [blame] | 953 | if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
David Sterba | 3f9e3df | 2014-04-15 18:50:17 +0200 | [diff] [blame] | 954 | ret = -EOPNOTSUPP; |
Liu Bo | 00fdf13 | 2014-03-10 18:56:07 +0800 | [diff] [blame] | 955 | break; |
| 956 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 957 | |
| 958 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 959 | start - key.offset); |
| 960 | btrfs_mark_buffer_dirty(leaf); |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 961 | if (update_refs && disk_bytenr > 0) |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 962 | inode_sub_bytes(inode, extent_end - start); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 963 | if (end == extent_end) |
| 964 | break; |
| 965 | |
| 966 | path->slots[0]++; |
| 967 | goto next_slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 968 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 969 | |
| 970 | /* |
| 971 | * | ---- range to drop ----- | |
| 972 | * | ------ extent ------ | |
| 973 | */ |
| 974 | if (start <= key.offset && end >= extent_end) { |
Filipe Manana | fc19c5e | 2014-04-29 13:18:40 +0100 | [diff] [blame] | 975 | delete_extent_item: |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 976 | if (del_nr == 0) { |
| 977 | del_slot = path->slots[0]; |
| 978 | del_nr = 1; |
| 979 | } else { |
| 980 | BUG_ON(del_slot + del_nr != path->slots[0]); |
| 981 | del_nr++; |
| 982 | } |
| 983 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 984 | if (update_refs && |
| 985 | extent_type == BTRFS_FILE_EXTENT_INLINE) { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 986 | inode_sub_bytes(inode, |
| 987 | extent_end - key.offset); |
| 988 | extent_end = ALIGN(extent_end, |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 989 | fs_info->sectorsize); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 990 | } else if (update_refs && disk_bytenr > 0) { |
Josef Bacik | 84f7d8e | 2017-09-29 15:43:49 -0400 | [diff] [blame] | 991 | ret = btrfs_free_extent(trans, root, |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 992 | disk_bytenr, num_bytes, 0, |
| 993 | root->root_key.objectid, |
| 994 | key.objectid, key.offset - |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 995 | extent_offset); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 996 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 997 | inode_sub_bytes(inode, |
| 998 | extent_end - key.offset); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 999 | } |
| 1000 | |
| 1001 | if (end == extent_end) |
| 1002 | break; |
| 1003 | |
| 1004 | if (path->slots[0] + 1 < btrfs_header_nritems(leaf)) { |
| 1005 | path->slots[0]++; |
| 1006 | goto next_slot; |
| 1007 | } |
| 1008 | |
| 1009 | ret = btrfs_del_items(trans, root, path, del_slot, |
| 1010 | del_nr); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1011 | if (ret) { |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 1012 | btrfs_abort_transaction(trans, ret); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 1013 | break; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1014 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1015 | |
| 1016 | del_nr = 0; |
| 1017 | del_slot = 0; |
| 1018 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1019 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1020 | continue; |
| 1021 | } |
| 1022 | |
| 1023 | BUG_ON(1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1024 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1025 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1026 | if (!ret && del_nr > 0) { |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 1027 | /* |
| 1028 | * Set path->slots[0] to first slot, so that after the delete |
| 1029 | * if items are move off from our leaf to its immediate left or |
| 1030 | * right neighbor leafs, we end up with a correct and adjusted |
Filipe David Borba Manana | d5f3752 | 2014-02-09 23:45:12 +0000 | [diff] [blame] | 1031 | * path->slots[0] for our insertion (if replace_extent != 0). |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 1032 | */ |
| 1033 | path->slots[0] = del_slot; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1034 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1035 | if (ret) |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 1036 | btrfs_abort_transaction(trans, ret); |
Filipe David Borba Manana | d5f3752 | 2014-02-09 23:45:12 +0000 | [diff] [blame] | 1037 | } |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 1038 | |
Filipe David Borba Manana | d5f3752 | 2014-02-09 23:45:12 +0000 | [diff] [blame] | 1039 | leaf = path->nodes[0]; |
| 1040 | /* |
| 1041 | * If btrfs_del_items() was called, it might have deleted a leaf, in |
| 1042 | * which case it unlocked our path, so check path->locks[0] matches a |
| 1043 | * write lock. |
| 1044 | */ |
| 1045 | if (!ret && replace_extent && leafs_visited == 1 && |
| 1046 | (path->locks[0] == BTRFS_WRITE_LOCK_BLOCKING || |
| 1047 | path->locks[0] == BTRFS_WRITE_LOCK) && |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 1048 | btrfs_leaf_free_space(fs_info, leaf) >= |
Filipe David Borba Manana | d5f3752 | 2014-02-09 23:45:12 +0000 | [diff] [blame] | 1049 | sizeof(struct btrfs_item) + extent_item_size) { |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 1050 | |
Filipe David Borba Manana | d5f3752 | 2014-02-09 23:45:12 +0000 | [diff] [blame] | 1051 | key.objectid = ino; |
| 1052 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 1053 | key.offset = start; |
| 1054 | if (!del_nr && path->slots[0] < btrfs_header_nritems(leaf)) { |
| 1055 | struct btrfs_key slot_key; |
| 1056 | |
| 1057 | btrfs_item_key_to_cpu(leaf, &slot_key, path->slots[0]); |
| 1058 | if (btrfs_comp_cpu_keys(&key, &slot_key) > 0) |
| 1059 | path->slots[0]++; |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 1060 | } |
Filipe David Borba Manana | d5f3752 | 2014-02-09 23:45:12 +0000 | [diff] [blame] | 1061 | setup_items_for_insert(root, path, &key, |
| 1062 | &extent_item_size, |
| 1063 | extent_item_size, |
| 1064 | sizeof(struct btrfs_item) + |
| 1065 | extent_item_size, 1); |
| 1066 | *key_inserted = 1; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1067 | } |
| 1068 | |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 1069 | if (!replace_extent || !(*key_inserted)) |
| 1070 | btrfs_release_path(path); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 1071 | if (drop_end) |
Josef Bacik | 62fe51c | 2016-11-16 09:13:39 -0500 | [diff] [blame] | 1072 | *drop_end = found ? min(end, last_end) : end; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 1073 | return ret; |
| 1074 | } |
| 1075 | |
| 1076 | int btrfs_drop_extents(struct btrfs_trans_handle *trans, |
| 1077 | struct btrfs_root *root, struct inode *inode, u64 start, |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 1078 | u64 end, int drop_cache) |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 1079 | { |
| 1080 | struct btrfs_path *path; |
| 1081 | int ret; |
| 1082 | |
| 1083 | path = btrfs_alloc_path(); |
| 1084 | if (!path) |
| 1085 | return -ENOMEM; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 1086 | ret = __btrfs_drop_extents(trans, root, inode, path, start, end, NULL, |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 1087 | drop_cache, 0, 0, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1088 | btrfs_free_path(path); |
| 1089 | return ret; |
| 1090 | } |
| 1091 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1092 | static int extent_mergeable(struct extent_buffer *leaf, int slot, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1093 | u64 objectid, u64 bytenr, u64 orig_offset, |
| 1094 | u64 *start, u64 *end) |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1095 | { |
| 1096 | struct btrfs_file_extent_item *fi; |
| 1097 | struct btrfs_key key; |
| 1098 | u64 extent_end; |
| 1099 | |
| 1100 | if (slot < 0 || slot >= btrfs_header_nritems(leaf)) |
| 1101 | return 0; |
| 1102 | |
| 1103 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 1104 | if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY) |
| 1105 | return 0; |
| 1106 | |
| 1107 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| 1108 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG || |
| 1109 | btrfs_file_extent_disk_bytenr(leaf, fi) != bytenr || |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1110 | btrfs_file_extent_offset(leaf, fi) != key.offset - orig_offset || |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1111 | btrfs_file_extent_compression(leaf, fi) || |
| 1112 | btrfs_file_extent_encryption(leaf, fi) || |
| 1113 | btrfs_file_extent_other_encoding(leaf, fi)) |
| 1114 | return 0; |
| 1115 | |
| 1116 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
| 1117 | if ((*start && *start != key.offset) || (*end && *end != extent_end)) |
| 1118 | return 0; |
| 1119 | |
| 1120 | *start = key.offset; |
| 1121 | *end = extent_end; |
| 1122 | return 1; |
| 1123 | } |
| 1124 | |
| 1125 | /* |
| 1126 | * Mark extent in the range start - end as written. |
| 1127 | * |
| 1128 | * This changes extent type from 'pre-allocated' to 'regular'. If only |
| 1129 | * part of extent is marked as written, the extent will be split into |
| 1130 | * two or three. |
| 1131 | */ |
| 1132 | int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, |
Nikolay Borisov | 7a6d706 | 2017-02-20 13:50:48 +0200 | [diff] [blame] | 1133 | struct btrfs_inode *inode, u64 start, u64 end) |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1134 | { |
Nikolay Borisov | 7a6d706 | 2017-02-20 13:50:48 +0200 | [diff] [blame] | 1135 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb); |
| 1136 | struct btrfs_root *root = inode->root; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1137 | struct extent_buffer *leaf; |
| 1138 | struct btrfs_path *path; |
| 1139 | struct btrfs_file_extent_item *fi; |
| 1140 | struct btrfs_key key; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1141 | struct btrfs_key new_key; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1142 | u64 bytenr; |
| 1143 | u64 num_bytes; |
| 1144 | u64 extent_end; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1145 | u64 orig_offset; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1146 | u64 other_start; |
| 1147 | u64 other_end; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1148 | u64 split; |
| 1149 | int del_nr = 0; |
| 1150 | int del_slot = 0; |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1151 | int recow; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1152 | int ret; |
Nikolay Borisov | 7a6d706 | 2017-02-20 13:50:48 +0200 | [diff] [blame] | 1153 | u64 ino = btrfs_ino(inode); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1154 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1155 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 1156 | if (!path) |
| 1157 | return -ENOMEM; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1158 | again: |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1159 | recow = 0; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1160 | split = start; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1161 | key.objectid = ino; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1162 | key.type = BTRFS_EXTENT_DATA_KEY; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1163 | key.offset = split; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1164 | |
| 1165 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Josef Bacik | 4141573 | 2011-03-16 13:59:32 -0400 | [diff] [blame] | 1166 | if (ret < 0) |
| 1167 | goto out; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1168 | if (ret > 0 && path->slots[0] > 0) |
| 1169 | path->slots[0]--; |
| 1170 | |
| 1171 | leaf = path->nodes[0]; |
| 1172 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Josef Bacik | 9c8e63d | 2016-09-02 15:40:06 -0400 | [diff] [blame] | 1173 | if (key.objectid != ino || |
| 1174 | key.type != BTRFS_EXTENT_DATA_KEY) { |
| 1175 | ret = -EINVAL; |
| 1176 | btrfs_abort_transaction(trans, ret); |
| 1177 | goto out; |
| 1178 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1179 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1180 | struct btrfs_file_extent_item); |
Josef Bacik | 9c8e63d | 2016-09-02 15:40:06 -0400 | [diff] [blame] | 1181 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_PREALLOC) { |
| 1182 | ret = -EINVAL; |
| 1183 | btrfs_abort_transaction(trans, ret); |
| 1184 | goto out; |
| 1185 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1186 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
Josef Bacik | 9c8e63d | 2016-09-02 15:40:06 -0400 | [diff] [blame] | 1187 | if (key.offset > start || extent_end < end) { |
| 1188 | ret = -EINVAL; |
| 1189 | btrfs_abort_transaction(trans, ret); |
| 1190 | goto out; |
| 1191 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1192 | |
| 1193 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 1194 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1195 | orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1196 | memcpy(&new_key, &key, sizeof(new_key)); |
| 1197 | |
| 1198 | if (start == key.offset && end < extent_end) { |
| 1199 | other_start = 0; |
| 1200 | other_end = start; |
| 1201 | if (extent_mergeable(leaf, path->slots[0] - 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1202 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1203 | &other_start, &other_end)) { |
| 1204 | new_key.offset = end; |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1205 | btrfs_set_item_key_safe(fs_info, path, &new_key); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1206 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1207 | struct btrfs_file_extent_item); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1208 | btrfs_set_file_extent_generation(leaf, fi, |
| 1209 | trans->transid); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1210 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1211 | extent_end - end); |
| 1212 | btrfs_set_file_extent_offset(leaf, fi, |
| 1213 | end - orig_offset); |
| 1214 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, |
| 1215 | struct btrfs_file_extent_item); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1216 | btrfs_set_file_extent_generation(leaf, fi, |
| 1217 | trans->transid); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1218 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1219 | end - other_start); |
| 1220 | btrfs_mark_buffer_dirty(leaf); |
| 1221 | goto out; |
| 1222 | } |
| 1223 | } |
| 1224 | |
| 1225 | if (start > key.offset && end == extent_end) { |
| 1226 | other_start = end; |
| 1227 | other_end = 0; |
| 1228 | if (extent_mergeable(leaf, path->slots[0] + 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1229 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1230 | &other_start, &other_end)) { |
| 1231 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1232 | struct btrfs_file_extent_item); |
| 1233 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1234 | start - key.offset); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1235 | btrfs_set_file_extent_generation(leaf, fi, |
| 1236 | trans->transid); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1237 | path->slots[0]++; |
| 1238 | new_key.offset = start; |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1239 | btrfs_set_item_key_safe(fs_info, path, &new_key); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1240 | |
| 1241 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1242 | struct btrfs_file_extent_item); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1243 | btrfs_set_file_extent_generation(leaf, fi, |
| 1244 | trans->transid); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1245 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1246 | other_end - start); |
| 1247 | btrfs_set_file_extent_offset(leaf, fi, |
| 1248 | start - orig_offset); |
| 1249 | btrfs_mark_buffer_dirty(leaf); |
| 1250 | goto out; |
| 1251 | } |
| 1252 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1253 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1254 | while (start > key.offset || end < extent_end) { |
| 1255 | if (key.offset == start) |
| 1256 | split = end; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1257 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1258 | new_key.offset = split; |
| 1259 | ret = btrfs_duplicate_item(trans, root, path, &new_key); |
| 1260 | if (ret == -EAGAIN) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1261 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1262 | goto again; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1263 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1264 | if (ret < 0) { |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 1265 | btrfs_abort_transaction(trans, ret); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1266 | goto out; |
| 1267 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1268 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1269 | leaf = path->nodes[0]; |
| 1270 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1271 | struct btrfs_file_extent_item); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1272 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1273 | btrfs_set_file_extent_num_bytes(leaf, fi, |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1274 | split - key.offset); |
| 1275 | |
| 1276 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1277 | struct btrfs_file_extent_item); |
| 1278 | |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1279 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1280 | btrfs_set_file_extent_offset(leaf, fi, split - orig_offset); |
| 1281 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1282 | extent_end - split); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1283 | btrfs_mark_buffer_dirty(leaf); |
| 1284 | |
Josef Bacik | 84f7d8e | 2017-09-29 15:43:49 -0400 | [diff] [blame] | 1285 | ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 1286 | 0, root->root_key.objectid, |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 1287 | ino, orig_offset); |
Josef Bacik | 9c8e63d | 2016-09-02 15:40:06 -0400 | [diff] [blame] | 1288 | if (ret) { |
| 1289 | btrfs_abort_transaction(trans, ret); |
| 1290 | goto out; |
| 1291 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1292 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1293 | if (split == start) { |
| 1294 | key.offset = start; |
| 1295 | } else { |
Josef Bacik | 9c8e63d | 2016-09-02 15:40:06 -0400 | [diff] [blame] | 1296 | if (start != key.offset) { |
| 1297 | ret = -EINVAL; |
| 1298 | btrfs_abort_transaction(trans, ret); |
| 1299 | goto out; |
| 1300 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1301 | path->slots[0]--; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1302 | extent_end = end; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1303 | } |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1304 | recow = 1; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1305 | } |
| 1306 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1307 | other_start = end; |
| 1308 | other_end = 0; |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1309 | if (extent_mergeable(leaf, path->slots[0] + 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1310 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1311 | &other_start, &other_end)) { |
| 1312 | if (recow) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1313 | btrfs_release_path(path); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1314 | goto again; |
| 1315 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1316 | extent_end = other_end; |
| 1317 | del_slot = path->slots[0] + 1; |
| 1318 | del_nr++; |
Josef Bacik | 84f7d8e | 2017-09-29 15:43:49 -0400 | [diff] [blame] | 1319 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1320 | 0, root->root_key.objectid, |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 1321 | ino, orig_offset); |
Josef Bacik | 9c8e63d | 2016-09-02 15:40:06 -0400 | [diff] [blame] | 1322 | if (ret) { |
| 1323 | btrfs_abort_transaction(trans, ret); |
| 1324 | goto out; |
| 1325 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1326 | } |
| 1327 | other_start = 0; |
| 1328 | other_end = start; |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1329 | if (extent_mergeable(leaf, path->slots[0] - 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1330 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1331 | &other_start, &other_end)) { |
| 1332 | if (recow) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1333 | btrfs_release_path(path); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1334 | goto again; |
| 1335 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1336 | key.offset = other_start; |
| 1337 | del_slot = path->slots[0]; |
| 1338 | del_nr++; |
Josef Bacik | 84f7d8e | 2017-09-29 15:43:49 -0400 | [diff] [blame] | 1339 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1340 | 0, root->root_key.objectid, |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 1341 | ino, orig_offset); |
Josef Bacik | 9c8e63d | 2016-09-02 15:40:06 -0400 | [diff] [blame] | 1342 | if (ret) { |
| 1343 | btrfs_abort_transaction(trans, ret); |
| 1344 | goto out; |
| 1345 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1346 | } |
| 1347 | if (del_nr == 0) { |
Shaohua Li | 3f6fae9 | 2010-02-11 07:43:00 +0000 | [diff] [blame] | 1348 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1349 | struct btrfs_file_extent_item); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1350 | btrfs_set_file_extent_type(leaf, fi, |
| 1351 | BTRFS_FILE_EXTENT_REG); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1352 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1353 | btrfs_mark_buffer_dirty(leaf); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1354 | } else { |
Shaohua Li | 3f6fae9 | 2010-02-11 07:43:00 +0000 | [diff] [blame] | 1355 | fi = btrfs_item_ptr(leaf, del_slot - 1, |
| 1356 | struct btrfs_file_extent_item); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1357 | btrfs_set_file_extent_type(leaf, fi, |
| 1358 | BTRFS_FILE_EXTENT_REG); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1359 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1360 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1361 | extent_end - key.offset); |
| 1362 | btrfs_mark_buffer_dirty(leaf); |
| 1363 | |
| 1364 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1365 | if (ret < 0) { |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 1366 | btrfs_abort_transaction(trans, ret); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1367 | goto out; |
| 1368 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1369 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1370 | out: |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1371 | btrfs_free_path(path); |
| 1372 | return 0; |
| 1373 | } |
| 1374 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1375 | /* |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1376 | * on error we return an unlocked page and the error value |
| 1377 | * on success we return a locked page and 0 |
| 1378 | */ |
Chris Mason | bb1591b4 | 2015-12-14 15:40:44 -0800 | [diff] [blame] | 1379 | static int prepare_uptodate_page(struct inode *inode, |
| 1380 | struct page *page, u64 pos, |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1381 | bool force_uptodate) |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1382 | { |
| 1383 | int ret = 0; |
| 1384 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1385 | if (((pos & (PAGE_SIZE - 1)) || force_uptodate) && |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1386 | !PageUptodate(page)) { |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1387 | ret = btrfs_readpage(NULL, page); |
| 1388 | if (ret) |
| 1389 | return ret; |
| 1390 | lock_page(page); |
| 1391 | if (!PageUptodate(page)) { |
| 1392 | unlock_page(page); |
| 1393 | return -EIO; |
| 1394 | } |
Chris Mason | bb1591b4 | 2015-12-14 15:40:44 -0800 | [diff] [blame] | 1395 | if (page->mapping != inode->i_mapping) { |
| 1396 | unlock_page(page); |
| 1397 | return -EAGAIN; |
| 1398 | } |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1399 | } |
| 1400 | return 0; |
| 1401 | } |
| 1402 | |
| 1403 | /* |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1404 | * this just gets pages into the page cache and locks them down. |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1405 | */ |
Miao Xie | b37392e | 2013-12-10 19:25:03 +0800 | [diff] [blame] | 1406 | static noinline int prepare_pages(struct inode *inode, struct page **pages, |
| 1407 | size_t num_pages, loff_t pos, |
| 1408 | size_t write_bytes, bool force_uptodate) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1409 | { |
| 1410 | int i; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1411 | unsigned long index = pos >> PAGE_SHIFT; |
Josef Bacik | 3b16a4e | 2011-09-21 15:05:58 -0400 | [diff] [blame] | 1412 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
Filipe David Borba Manana | fc28b62 | 2013-12-13 19:39:34 +0000 | [diff] [blame] | 1413 | int err = 0; |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1414 | int faili; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1415 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1416 | for (i = 0; i < num_pages; i++) { |
Chris Mason | bb1591b4 | 2015-12-14 15:40:44 -0800 | [diff] [blame] | 1417 | again: |
Josef Bacik | a94733d | 2011-07-11 10:47:06 -0400 | [diff] [blame] | 1418 | pages[i] = find_or_create_page(inode->i_mapping, index + i, |
Johannes Weiner | e3a41a5 | 2012-01-10 15:07:55 -0800 | [diff] [blame] | 1419 | mask | __GFP_WRITE); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1420 | if (!pages[i]) { |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1421 | faili = i - 1; |
| 1422 | err = -ENOMEM; |
| 1423 | goto fail; |
| 1424 | } |
| 1425 | |
| 1426 | if (i == 0) |
Chris Mason | bb1591b4 | 2015-12-14 15:40:44 -0800 | [diff] [blame] | 1427 | err = prepare_uptodate_page(inode, pages[i], pos, |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1428 | force_uptodate); |
Chris Mason | bb1591b4 | 2015-12-14 15:40:44 -0800 | [diff] [blame] | 1429 | if (!err && i == num_pages - 1) |
| 1430 | err = prepare_uptodate_page(inode, pages[i], |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1431 | pos + write_bytes, false); |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1432 | if (err) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1433 | put_page(pages[i]); |
Chris Mason | bb1591b4 | 2015-12-14 15:40:44 -0800 | [diff] [blame] | 1434 | if (err == -EAGAIN) { |
| 1435 | err = 0; |
| 1436 | goto again; |
| 1437 | } |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1438 | faili = i - 1; |
| 1439 | goto fail; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1440 | } |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1441 | wait_on_page_writeback(pages[i]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1442 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1443 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1444 | return 0; |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1445 | fail: |
| 1446 | while (faili >= 0) { |
| 1447 | unlock_page(pages[faili]); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1448 | put_page(pages[faili]); |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1449 | faili--; |
| 1450 | } |
| 1451 | return err; |
| 1452 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1453 | } |
| 1454 | |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1455 | /* |
| 1456 | * This function locks the extent and properly waits for data=ordered extents |
| 1457 | * to finish before allowing the pages to be modified if need. |
| 1458 | * |
| 1459 | * The return value: |
| 1460 | * 1 - the extent is locked |
| 1461 | * 0 - the extent is not locked, and everything is OK |
| 1462 | * -EAGAIN - need re-prepare the pages |
| 1463 | * the other < 0 number - Something wrong happens |
| 1464 | */ |
| 1465 | static noinline int |
Nikolay Borisov | 2cff578c | 2017-02-20 13:50:51 +0200 | [diff] [blame] | 1466 | lock_and_cleanup_extent_if_need(struct btrfs_inode *inode, struct page **pages, |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1467 | size_t num_pages, loff_t pos, |
Chandan Rajendra | 2e78c92 | 2016-01-21 15:55:53 +0530 | [diff] [blame] | 1468 | size_t write_bytes, |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1469 | u64 *lockstart, u64 *lockend, |
| 1470 | struct extent_state **cached_state) |
| 1471 | { |
Nikolay Borisov | 2cff578c | 2017-02-20 13:50:51 +0200 | [diff] [blame] | 1472 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb); |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1473 | u64 start_pos; |
| 1474 | u64 last_pos; |
| 1475 | int i; |
| 1476 | int ret = 0; |
| 1477 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1478 | start_pos = round_down(pos, fs_info->sectorsize); |
Chandan Rajendra | 2e78c92 | 2016-01-21 15:55:53 +0530 | [diff] [blame] | 1479 | last_pos = start_pos |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 1480 | + round_up(pos + write_bytes - start_pos, |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1481 | fs_info->sectorsize) - 1; |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1482 | |
Filipe Manana | e3b8a48 | 2017-11-04 00:16:59 +0000 | [diff] [blame] | 1483 | if (start_pos < inode->vfs_inode.i_size) { |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1484 | struct btrfs_ordered_extent *ordered; |
Filipe Manana | a7e3b97 | 2017-04-03 10:45:46 +0100 | [diff] [blame] | 1485 | |
Nikolay Borisov | 2cff578c | 2017-02-20 13:50:51 +0200 | [diff] [blame] | 1486 | lock_extent_bits(&inode->io_tree, start_pos, last_pos, |
| 1487 | cached_state); |
Miao Xie | b88935b | 2014-03-06 13:54:58 +0800 | [diff] [blame] | 1488 | ordered = btrfs_lookup_ordered_range(inode, start_pos, |
| 1489 | last_pos - start_pos + 1); |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1490 | if (ordered && |
| 1491 | ordered->file_offset + ordered->len > start_pos && |
| 1492 | ordered->file_offset <= last_pos) { |
Nikolay Borisov | 2cff578c | 2017-02-20 13:50:51 +0200 | [diff] [blame] | 1493 | unlock_extent_cached(&inode->io_tree, start_pos, |
David Sterba | e43bbe5 | 2017-12-12 21:43:52 +0100 | [diff] [blame] | 1494 | last_pos, cached_state); |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1495 | for (i = 0; i < num_pages; i++) { |
| 1496 | unlock_page(pages[i]); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1497 | put_page(pages[i]); |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1498 | } |
Nikolay Borisov | 2cff578c | 2017-02-20 13:50:51 +0200 | [diff] [blame] | 1499 | btrfs_start_ordered_extent(&inode->vfs_inode, |
| 1500 | ordered, 1); |
Miao Xie | b88935b | 2014-03-06 13:54:58 +0800 | [diff] [blame] | 1501 | btrfs_put_ordered_extent(ordered); |
| 1502 | return -EAGAIN; |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1503 | } |
| 1504 | if (ordered) |
| 1505 | btrfs_put_ordered_extent(ordered); |
Filipe Manana | e3b8a48 | 2017-11-04 00:16:59 +0000 | [diff] [blame] | 1506 | clear_extent_bit(&inode->io_tree, start_pos, last_pos, |
| 1507 | EXTENT_DIRTY | EXTENT_DELALLOC | |
| 1508 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, |
David Sterba | ae0f162 | 2017-10-31 16:37:52 +0100 | [diff] [blame] | 1509 | 0, 0, cached_state); |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1510 | *lockstart = start_pos; |
| 1511 | *lockend = last_pos; |
| 1512 | ret = 1; |
| 1513 | } |
| 1514 | |
| 1515 | for (i = 0; i < num_pages; i++) { |
| 1516 | if (clear_page_dirty_for_io(pages[i])) |
| 1517 | account_page_redirty(pages[i]); |
| 1518 | set_page_extent_mapped(pages[i]); |
| 1519 | WARN_ON(!PageLocked(pages[i])); |
| 1520 | } |
| 1521 | |
| 1522 | return ret; |
| 1523 | } |
| 1524 | |
Nikolay Borisov | 85b7ab6 | 2017-02-20 13:50:50 +0200 | [diff] [blame] | 1525 | static noinline int check_can_nocow(struct btrfs_inode *inode, loff_t pos, |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1526 | size_t *write_bytes) |
| 1527 | { |
Nikolay Borisov | 85b7ab6 | 2017-02-20 13:50:50 +0200 | [diff] [blame] | 1528 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb); |
| 1529 | struct btrfs_root *root = inode->root; |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1530 | struct btrfs_ordered_extent *ordered; |
| 1531 | u64 lockstart, lockend; |
| 1532 | u64 num_bytes; |
| 1533 | int ret; |
| 1534 | |
David Sterba | ea14b57f | 2017-06-22 02:19:11 +0200 | [diff] [blame] | 1535 | ret = btrfs_start_write_no_snapshotting(root); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 1536 | if (!ret) |
| 1537 | return -ENOSPC; |
| 1538 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1539 | lockstart = round_down(pos, fs_info->sectorsize); |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 1540 | lockend = round_up(pos + *write_bytes, |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1541 | fs_info->sectorsize) - 1; |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1542 | |
| 1543 | while (1) { |
Nikolay Borisov | 85b7ab6 | 2017-02-20 13:50:50 +0200 | [diff] [blame] | 1544 | lock_extent(&inode->io_tree, lockstart, lockend); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1545 | ordered = btrfs_lookup_ordered_range(inode, lockstart, |
| 1546 | lockend - lockstart + 1); |
| 1547 | if (!ordered) { |
| 1548 | break; |
| 1549 | } |
Nikolay Borisov | 85b7ab6 | 2017-02-20 13:50:50 +0200 | [diff] [blame] | 1550 | unlock_extent(&inode->io_tree, lockstart, lockend); |
| 1551 | btrfs_start_ordered_extent(&inode->vfs_inode, ordered, 1); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1552 | btrfs_put_ordered_extent(ordered); |
| 1553 | } |
| 1554 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1555 | num_bytes = lockend - lockstart + 1; |
Nikolay Borisov | 85b7ab6 | 2017-02-20 13:50:50 +0200 | [diff] [blame] | 1556 | ret = can_nocow_extent(&inode->vfs_inode, lockstart, &num_bytes, |
| 1557 | NULL, NULL, NULL); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1558 | if (ret <= 0) { |
| 1559 | ret = 0; |
David Sterba | ea14b57f | 2017-06-22 02:19:11 +0200 | [diff] [blame] | 1560 | btrfs_end_write_no_snapshotting(root); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1561 | } else { |
Miao Xie | c933956 | 2014-02-27 13:58:04 +0800 | [diff] [blame] | 1562 | *write_bytes = min_t(size_t, *write_bytes , |
| 1563 | num_bytes - pos + lockstart); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1564 | } |
| 1565 | |
Nikolay Borisov | 85b7ab6 | 2017-02-20 13:50:50 +0200 | [diff] [blame] | 1566 | unlock_extent(&inode->io_tree, lockstart, lockend); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1567 | |
| 1568 | return ret; |
| 1569 | } |
| 1570 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1571 | static noinline ssize_t __btrfs_buffered_write(struct file *file, |
| 1572 | struct iov_iter *i, |
| 1573 | loff_t pos) |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 1574 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1575 | struct inode *inode = file_inode(file); |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1576 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 1577 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 1578 | struct page **pages = NULL; |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1579 | struct extent_state *cached_state = NULL; |
Qu Wenruo | 364ecf3 | 2017-02-27 15:10:38 +0800 | [diff] [blame] | 1580 | struct extent_changeset *data_reserved = NULL; |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1581 | u64 release_bytes = 0; |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1582 | u64 lockstart; |
| 1583 | u64 lockend; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1584 | size_t num_written = 0; |
| 1585 | int nrptrs; |
Tsutomu Itoh | c914923 | 2011-03-30 00:57:23 +0000 | [diff] [blame] | 1586 | int ret = 0; |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1587 | bool only_release_metadata = false; |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1588 | bool force_page_uptodate = false; |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 1589 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1590 | nrptrs = min(DIV_ROUND_UP(iov_iter_count(i), PAGE_SIZE), |
| 1591 | PAGE_SIZE / (sizeof(struct page *))); |
Wu Fengguang | 142349f | 2011-12-16 12:32:57 -0500 | [diff] [blame] | 1592 | nrptrs = min(nrptrs, current->nr_dirtied_pause - current->nr_dirtied); |
| 1593 | nrptrs = max(nrptrs, 8); |
David Sterba | 31e818f | 2015-02-20 18:00:26 +0100 | [diff] [blame] | 1594 | pages = kmalloc_array(nrptrs, sizeof(struct page *), GFP_KERNEL); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1595 | if (!pages) |
| 1596 | return -ENOMEM; |
Chris Mason | ab93dbe | 2009-10-01 12:29:10 -0400 | [diff] [blame] | 1597 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1598 | while (iov_iter_count(i) > 0) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1599 | size_t offset = pos & (PAGE_SIZE - 1); |
Chandan Rajendra | 2e78c92 | 2016-01-21 15:55:53 +0530 | [diff] [blame] | 1600 | size_t sector_offset; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1601 | size_t write_bytes = min(iov_iter_count(i), |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1602 | nrptrs * (size_t)PAGE_SIZE - |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1603 | offset); |
David Sterba | ed6078f | 2014-06-05 01:59:57 +0200 | [diff] [blame] | 1604 | size_t num_pages = DIV_ROUND_UP(write_bytes + offset, |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1605 | PAGE_SIZE); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1606 | size_t reserve_bytes; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1607 | size_t dirty_pages; |
| 1608 | size_t copied; |
Chandan Rajendra | 2e78c92 | 2016-01-21 15:55:53 +0530 | [diff] [blame] | 1609 | size_t dirty_sectors; |
| 1610 | size_t num_sectors; |
Goldwyn Rodrigues | 79f015f | 2017-10-16 05:43:21 -0500 | [diff] [blame] | 1611 | int extents_locked; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1612 | |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1613 | WARN_ON(num_pages > nrptrs); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1614 | |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1615 | /* |
| 1616 | * Fault pages before locking them in prepare_pages |
| 1617 | * to avoid recursive lock |
| 1618 | */ |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1619 | if (unlikely(iov_iter_fault_in_readable(i, write_bytes))) { |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1620 | ret = -EFAULT; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1621 | break; |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1622 | } |
| 1623 | |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 1624 | sector_offset = pos & (fs_info->sectorsize - 1); |
Chandan Rajendra | 2e78c92 | 2016-01-21 15:55:53 +0530 | [diff] [blame] | 1625 | reserve_bytes = round_up(write_bytes + sector_offset, |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 1626 | fs_info->sectorsize); |
Qu Wenruo | d9d8b2a | 2015-09-08 17:22:43 +0800 | [diff] [blame] | 1627 | |
Qu Wenruo | 364ecf3 | 2017-02-27 15:10:38 +0800 | [diff] [blame] | 1628 | extent_changeset_release(data_reserved); |
| 1629 | ret = btrfs_check_data_free_space(inode, &data_reserved, pos, |
| 1630 | write_bytes); |
Josef Bacik | c6887cd | 2016-03-25 13:26:00 -0400 | [diff] [blame] | 1631 | if (ret < 0) { |
| 1632 | if ((BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW | |
| 1633 | BTRFS_INODE_PREALLOC)) && |
Nikolay Borisov | 85b7ab6 | 2017-02-20 13:50:50 +0200 | [diff] [blame] | 1634 | check_can_nocow(BTRFS_I(inode), pos, |
| 1635 | &write_bytes) > 0) { |
Josef Bacik | c6887cd | 2016-03-25 13:26:00 -0400 | [diff] [blame] | 1636 | /* |
| 1637 | * For nodata cow case, no need to reserve |
| 1638 | * data space. |
| 1639 | */ |
| 1640 | only_release_metadata = true; |
| 1641 | /* |
| 1642 | * our prealloc extent may be smaller than |
| 1643 | * write_bytes, so scale down. |
| 1644 | */ |
| 1645 | num_pages = DIV_ROUND_UP(write_bytes + offset, |
| 1646 | PAGE_SIZE); |
| 1647 | reserve_bytes = round_up(write_bytes + |
| 1648 | sector_offset, |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 1649 | fs_info->sectorsize); |
Josef Bacik | c6887cd | 2016-03-25 13:26:00 -0400 | [diff] [blame] | 1650 | } else { |
| 1651 | break; |
| 1652 | } |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1653 | } |
Zhao Lei | 4da2e26 | 2016-01-06 18:24:43 +0800 | [diff] [blame] | 1654 | |
Josef Bacik | 8b62f87 | 2017-10-19 14:15:55 -0400 | [diff] [blame] | 1655 | WARN_ON(reserve_bytes == 0); |
Nikolay Borisov | 9f3db42 | 2017-02-20 13:50:41 +0200 | [diff] [blame] | 1656 | ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode), |
| 1657 | reserve_bytes); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1658 | if (ret) { |
| 1659 | if (!only_release_metadata) |
Qu Wenruo | bc42bda | 2017-02-27 15:10:39 +0800 | [diff] [blame] | 1660 | btrfs_free_reserved_data_space(inode, |
| 1661 | data_reserved, pos, |
| 1662 | write_bytes); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 1663 | else |
David Sterba | ea14b57f | 2017-06-22 02:19:11 +0200 | [diff] [blame] | 1664 | btrfs_end_write_no_snapshotting(root); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1665 | break; |
| 1666 | } |
| 1667 | |
| 1668 | release_bytes = reserve_bytes; |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1669 | again: |
Josef Bacik | 4a64001 | 2011-01-25 15:10:08 -0500 | [diff] [blame] | 1670 | /* |
| 1671 | * This is going to setup the pages array with the number of |
| 1672 | * pages we want, so we don't really need to worry about the |
| 1673 | * contents of pages from loop to loop |
| 1674 | */ |
Miao Xie | b37392e | 2013-12-10 19:25:03 +0800 | [diff] [blame] | 1675 | ret = prepare_pages(inode, pages, num_pages, |
| 1676 | pos, write_bytes, |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1677 | force_page_uptodate); |
Josef Bacik | 8b62f87 | 2017-10-19 14:15:55 -0400 | [diff] [blame] | 1678 | if (ret) { |
| 1679 | btrfs_delalloc_release_extents(BTRFS_I(inode), |
Qu Wenruo | 43b1859 | 2017-12-12 15:34:32 +0800 | [diff] [blame] | 1680 | reserve_bytes, true); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1681 | break; |
Josef Bacik | 8b62f87 | 2017-10-19 14:15:55 -0400 | [diff] [blame] | 1682 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1683 | |
Goldwyn Rodrigues | 79f015f | 2017-10-16 05:43:21 -0500 | [diff] [blame] | 1684 | extents_locked = lock_and_cleanup_extent_if_need( |
| 1685 | BTRFS_I(inode), pages, |
Nikolay Borisov | 2cff578c | 2017-02-20 13:50:51 +0200 | [diff] [blame] | 1686 | num_pages, pos, write_bytes, &lockstart, |
| 1687 | &lockend, &cached_state); |
Goldwyn Rodrigues | 79f015f | 2017-10-16 05:43:21 -0500 | [diff] [blame] | 1688 | if (extents_locked < 0) { |
| 1689 | if (extents_locked == -EAGAIN) |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1690 | goto again; |
Josef Bacik | 8b62f87 | 2017-10-19 14:15:55 -0400 | [diff] [blame] | 1691 | btrfs_delalloc_release_extents(BTRFS_I(inode), |
Qu Wenruo | 43b1859 | 2017-12-12 15:34:32 +0800 | [diff] [blame] | 1692 | reserve_bytes, true); |
Goldwyn Rodrigues | 79f015f | 2017-10-16 05:43:21 -0500 | [diff] [blame] | 1693 | ret = extents_locked; |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1694 | break; |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1695 | } |
| 1696 | |
Zhao Lei | ee22f0c | 2016-01-06 18:47:31 +0800 | [diff] [blame] | 1697 | copied = btrfs_copy_from_user(pos, write_bytes, pages, i); |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1698 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1699 | num_sectors = BTRFS_BYTES_TO_BLKS(fs_info, reserve_bytes); |
Chris Mason | 56244ef | 2016-05-16 09:21:01 -0700 | [diff] [blame] | 1700 | dirty_sectors = round_up(copied + sector_offset, |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1701 | fs_info->sectorsize); |
| 1702 | dirty_sectors = BTRFS_BYTES_TO_BLKS(fs_info, dirty_sectors); |
Chris Mason | 56244ef | 2016-05-16 09:21:01 -0700 | [diff] [blame] | 1703 | |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1704 | /* |
| 1705 | * if we have trouble faulting in the pages, fall |
| 1706 | * back to one page at a time |
| 1707 | */ |
| 1708 | if (copied < write_bytes) |
| 1709 | nrptrs = 1; |
| 1710 | |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1711 | if (copied == 0) { |
| 1712 | force_page_uptodate = true; |
Chris Mason | 56244ef | 2016-05-16 09:21:01 -0700 | [diff] [blame] | 1713 | dirty_sectors = 0; |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1714 | dirty_pages = 0; |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1715 | } else { |
| 1716 | force_page_uptodate = false; |
David Sterba | ed6078f | 2014-06-05 01:59:57 +0200 | [diff] [blame] | 1717 | dirty_pages = DIV_ROUND_UP(copied + offset, |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1718 | PAGE_SIZE); |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1719 | } |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1720 | |
Chandan Rajendra | 2e78c92 | 2016-01-21 15:55:53 +0530 | [diff] [blame] | 1721 | if (num_sectors > dirty_sectors) { |
Chris Mason | 8b8b08c | 2016-07-19 05:52:36 -0700 | [diff] [blame] | 1722 | /* release everything except the sectors we dirtied */ |
| 1723 | release_bytes -= dirty_sectors << |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1724 | fs_info->sb->s_blocksize_bits; |
Qu Wenruo | 485290a | 2015-10-29 17:28:46 +0800 | [diff] [blame] | 1725 | if (only_release_metadata) { |
Nikolay Borisov | 691fa05 | 2017-02-20 13:50:42 +0200 | [diff] [blame] | 1726 | btrfs_delalloc_release_metadata(BTRFS_I(inode), |
Qu Wenruo | 43b1859 | 2017-12-12 15:34:32 +0800 | [diff] [blame] | 1727 | release_bytes, true); |
Qu Wenruo | 485290a | 2015-10-29 17:28:46 +0800 | [diff] [blame] | 1728 | } else { |
| 1729 | u64 __pos; |
| 1730 | |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 1731 | __pos = round_down(pos, |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1732 | fs_info->sectorsize) + |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1733 | (dirty_pages << PAGE_SHIFT); |
Qu Wenruo | bc42bda | 2017-02-27 15:10:39 +0800 | [diff] [blame] | 1734 | btrfs_delalloc_release_space(inode, |
| 1735 | data_reserved, __pos, |
Qu Wenruo | 43b1859 | 2017-12-12 15:34:32 +0800 | [diff] [blame] | 1736 | release_bytes, true); |
Qu Wenruo | 485290a | 2015-10-29 17:28:46 +0800 | [diff] [blame] | 1737 | } |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1738 | } |
| 1739 | |
Chandan Rajendra | 2e78c92 | 2016-01-21 15:55:53 +0530 | [diff] [blame] | 1740 | release_bytes = round_up(copied + sector_offset, |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1741 | fs_info->sectorsize); |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1742 | |
| 1743 | if (copied > 0) |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 1744 | ret = btrfs_dirty_pages(inode, pages, dirty_pages, |
Filipe Manana | 94f4507 | 2017-10-31 17:59:54 +0000 | [diff] [blame] | 1745 | pos, copied, &cached_state); |
Goldwyn Rodrigues | 79f015f | 2017-10-16 05:43:21 -0500 | [diff] [blame] | 1746 | if (extents_locked) |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1747 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
David Sterba | e43bbe5 | 2017-12-12 21:43:52 +0100 | [diff] [blame] | 1748 | lockstart, lockend, &cached_state); |
Qu Wenruo | 43b1859 | 2017-12-12 15:34:32 +0800 | [diff] [blame] | 1749 | btrfs_delalloc_release_extents(BTRFS_I(inode), reserve_bytes, |
Qu Wenruo | 336a8bb | 2018-04-17 18:43:58 +0800 | [diff] [blame] | 1750 | true); |
Miao Xie | f1de968 | 2014-01-09 10:06:10 +0800 | [diff] [blame] | 1751 | if (ret) { |
| 1752 | btrfs_drop_pages(pages, num_pages); |
Miao Xie | 376cc68 | 2013-12-10 19:25:04 +0800 | [diff] [blame] | 1753 | break; |
Miao Xie | f1de968 | 2014-01-09 10:06:10 +0800 | [diff] [blame] | 1754 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1755 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1756 | release_bytes = 0; |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 1757 | if (only_release_metadata) |
David Sterba | ea14b57f | 2017-06-22 02:19:11 +0200 | [diff] [blame] | 1758 | btrfs_end_write_no_snapshotting(root); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 1759 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1760 | if (only_release_metadata && copied > 0) { |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 1761 | lockstart = round_down(pos, |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1762 | fs_info->sectorsize); |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 1763 | lockend = round_up(pos + copied, |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1764 | fs_info->sectorsize) - 1; |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1765 | |
| 1766 | set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, |
| 1767 | lockend, EXTENT_NORESERVE, NULL, |
| 1768 | NULL, GFP_NOFS); |
| 1769 | only_release_metadata = false; |
| 1770 | } |
| 1771 | |
Miao Xie | f1de968 | 2014-01-09 10:06:10 +0800 | [diff] [blame] | 1772 | btrfs_drop_pages(pages, num_pages); |
| 1773 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1774 | cond_resched(); |
| 1775 | |
Namjae Jeon | d0e1d66 | 2012-12-11 16:00:21 -0800 | [diff] [blame] | 1776 | balance_dirty_pages_ratelimited(inode->i_mapping); |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1777 | if (dirty_pages < (fs_info->nodesize >> PAGE_SHIFT) + 1) |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 1778 | btrfs_btree_balance_dirty(fs_info); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1779 | |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1780 | pos += copied; |
| 1781 | num_written += copied; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1782 | } |
Chris Mason | 5b92ee7 | 2008-01-03 13:46:11 -0500 | [diff] [blame] | 1783 | |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1784 | kfree(pages); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1785 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1786 | if (release_bytes) { |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 1787 | if (only_release_metadata) { |
David Sterba | ea14b57f | 2017-06-22 02:19:11 +0200 | [diff] [blame] | 1788 | btrfs_end_write_no_snapshotting(root); |
Nikolay Borisov | 691fa05 | 2017-02-20 13:50:42 +0200 | [diff] [blame] | 1789 | btrfs_delalloc_release_metadata(BTRFS_I(inode), |
Qu Wenruo | 43b1859 | 2017-12-12 15:34:32 +0800 | [diff] [blame] | 1790 | release_bytes, true); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 1791 | } else { |
Qu Wenruo | bc42bda | 2017-02-27 15:10:39 +0800 | [diff] [blame] | 1792 | btrfs_delalloc_release_space(inode, data_reserved, |
| 1793 | round_down(pos, fs_info->sectorsize), |
Qu Wenruo | 43b1859 | 2017-12-12 15:34:32 +0800 | [diff] [blame] | 1794 | release_bytes, true); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 1795 | } |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1796 | } |
| 1797 | |
Qu Wenruo | 364ecf3 | 2017-02-27 15:10:38 +0800 | [diff] [blame] | 1798 | extent_changeset_free(data_reserved); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1799 | return num_written ? num_written : ret; |
| 1800 | } |
| 1801 | |
Christoph Hellwig | 1af5bb4 | 2016-04-07 08:51:56 -0700 | [diff] [blame] | 1802 | static ssize_t __btrfs_direct_write(struct kiocb *iocb, struct iov_iter *from) |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1803 | { |
| 1804 | struct file *file = iocb->ki_filp; |
Filipe Manana | 728404d | 2014-10-10 09:43:11 +0100 | [diff] [blame] | 1805 | struct inode *inode = file_inode(file); |
Christoph Hellwig | 1af5bb4 | 2016-04-07 08:51:56 -0700 | [diff] [blame] | 1806 | loff_t pos = iocb->ki_pos; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1807 | ssize_t written; |
| 1808 | ssize_t written_buffered; |
| 1809 | loff_t endbyte; |
| 1810 | int err; |
| 1811 | |
Christoph Hellwig | 1af5bb4 | 2016-04-07 08:51:56 -0700 | [diff] [blame] | 1812 | written = generic_file_direct_write(iocb, from); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1813 | |
Al Viro | 0c94933 | 2014-03-22 06:51:37 -0400 | [diff] [blame] | 1814 | if (written < 0 || !iov_iter_count(from)) |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1815 | return written; |
| 1816 | |
| 1817 | pos += written; |
Al Viro | 0ae5e4d | 2014-03-03 22:09:39 -0500 | [diff] [blame] | 1818 | written_buffered = __btrfs_buffered_write(file, from, pos); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1819 | if (written_buffered < 0) { |
| 1820 | err = written_buffered; |
| 1821 | goto out; |
| 1822 | } |
Filipe Manana | 075bdbd | 2014-10-09 21:18:55 +0100 | [diff] [blame] | 1823 | /* |
| 1824 | * Ensure all data is persisted. We want the next direct IO read to be |
| 1825 | * able to read what was just written. |
| 1826 | */ |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1827 | endbyte = pos + written_buffered - 1; |
Filipe Manana | 728404d | 2014-10-10 09:43:11 +0100 | [diff] [blame] | 1828 | err = btrfs_fdatawrite_range(inode, pos, endbyte); |
Filipe Manana | 075bdbd | 2014-10-09 21:18:55 +0100 | [diff] [blame] | 1829 | if (err) |
| 1830 | goto out; |
Filipe Manana | 728404d | 2014-10-10 09:43:11 +0100 | [diff] [blame] | 1831 | err = filemap_fdatawait_range(inode->i_mapping, pos, endbyte); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1832 | if (err) |
| 1833 | goto out; |
| 1834 | written += written_buffered; |
Al Viro | 867c4f9 | 2014-02-11 19:31:06 -0500 | [diff] [blame] | 1835 | iocb->ki_pos = pos + written_buffered; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1836 | invalidate_mapping_pages(file->f_mapping, pos >> PAGE_SHIFT, |
| 1837 | endbyte >> PAGE_SHIFT); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1838 | out: |
| 1839 | return written ? written : err; |
| 1840 | } |
| 1841 | |
Josef Bacik | 6c760c0 | 2012-11-09 10:53:21 -0500 | [diff] [blame] | 1842 | static void update_time_for_write(struct inode *inode) |
| 1843 | { |
Deepa Dinamani | 95582b0 | 2018-05-08 19:36:02 -0700 | [diff] [blame] | 1844 | struct timespec64 now; |
Josef Bacik | 6c760c0 | 2012-11-09 10:53:21 -0500 | [diff] [blame] | 1845 | |
| 1846 | if (IS_NOCMTIME(inode)) |
| 1847 | return; |
| 1848 | |
Deepa Dinamani | c2050a4 | 2016-09-14 07:48:06 -0700 | [diff] [blame] | 1849 | now = current_time(inode); |
Deepa Dinamani | 95582b0 | 2018-05-08 19:36:02 -0700 | [diff] [blame] | 1850 | if (!timespec64_equal(&inode->i_mtime, &now)) |
Josef Bacik | 6c760c0 | 2012-11-09 10:53:21 -0500 | [diff] [blame] | 1851 | inode->i_mtime = now; |
| 1852 | |
Deepa Dinamani | 95582b0 | 2018-05-08 19:36:02 -0700 | [diff] [blame] | 1853 | if (!timespec64_equal(&inode->i_ctime, &now)) |
Josef Bacik | 6c760c0 | 2012-11-09 10:53:21 -0500 | [diff] [blame] | 1854 | inode->i_ctime = now; |
| 1855 | |
| 1856 | if (IS_I_VERSION(inode)) |
| 1857 | inode_inc_iversion(inode); |
| 1858 | } |
| 1859 | |
Al Viro | b30ac0f | 2014-04-03 14:29:04 -0400 | [diff] [blame] | 1860 | static ssize_t btrfs_file_write_iter(struct kiocb *iocb, |
| 1861 | struct iov_iter *from) |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1862 | { |
| 1863 | struct file *file = iocb->ki_filp; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1864 | struct inode *inode = file_inode(file); |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1865 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1866 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Miao Xie | 0c1a98c | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1867 | u64 start_pos; |
Qu Wenruo | 3ac0d7b | 2014-03-27 02:51:58 +0000 | [diff] [blame] | 1868 | u64 end_pos; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1869 | ssize_t num_written = 0; |
Josef Bacik | b812ce2 | 2012-11-16 13:56:32 -0500 | [diff] [blame] | 1870 | bool sync = (file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host); |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 1871 | ssize_t err; |
Goldwyn Rodrigues | ff0fa73 | 2017-07-04 22:33:07 -0500 | [diff] [blame] | 1872 | loff_t pos; |
Goldwyn Rodrigues | edf064e | 2017-06-20 07:05:49 -0500 | [diff] [blame] | 1873 | size_t count = iov_iter_count(from); |
Chandan Rajendra | 27772b6 | 2016-01-21 15:56:03 +0530 | [diff] [blame] | 1874 | loff_t oldsize; |
| 1875 | int clean_page = 0; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1876 | |
Christoph Hellwig | 91f9943 | 2017-08-29 16:13:20 +0200 | [diff] [blame] | 1877 | if (!(iocb->ki_flags & IOCB_DIRECT) && |
| 1878 | (iocb->ki_flags & IOCB_NOWAIT)) |
| 1879 | return -EOPNOTSUPP; |
| 1880 | |
Goldwyn Rodrigues | ff0fa73 | 2017-07-04 22:33:07 -0500 | [diff] [blame] | 1881 | if (!inode_trylock(inode)) { |
| 1882 | if (iocb->ki_flags & IOCB_NOWAIT) |
Goldwyn Rodrigues | edf064e | 2017-06-20 07:05:49 -0500 | [diff] [blame] | 1883 | return -EAGAIN; |
Goldwyn Rodrigues | ff0fa73 | 2017-07-04 22:33:07 -0500 | [diff] [blame] | 1884 | inode_lock(inode); |
| 1885 | } |
| 1886 | |
| 1887 | err = generic_write_checks(iocb, from); |
| 1888 | if (err <= 0) { |
| 1889 | inode_unlock(inode); |
| 1890 | return err; |
| 1891 | } |
| 1892 | |
| 1893 | pos = iocb->ki_pos; |
| 1894 | if (iocb->ki_flags & IOCB_NOWAIT) { |
Goldwyn Rodrigues | edf064e | 2017-06-20 07:05:49 -0500 | [diff] [blame] | 1895 | /* |
| 1896 | * We will allocate space in case nodatacow is not set, |
| 1897 | * so bail |
| 1898 | */ |
| 1899 | if (!(BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW | |
| 1900 | BTRFS_INODE_PREALLOC)) || |
| 1901 | check_can_nocow(BTRFS_I(inode), pos, &count) <= 0) { |
| 1902 | inode_unlock(inode); |
| 1903 | return -EAGAIN; |
| 1904 | } |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 1905 | } |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1906 | |
Christoph Hellwig | de1414a | 2015-01-14 10:42:36 +0100 | [diff] [blame] | 1907 | current->backing_dev_info = inode_to_bdi(inode); |
Jan Kara | 5fa8e0a | 2015-05-21 16:05:53 +0200 | [diff] [blame] | 1908 | err = file_remove_privs(file); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1909 | if (err) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 1910 | inode_unlock(inode); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1911 | goto out; |
| 1912 | } |
| 1913 | |
| 1914 | /* |
| 1915 | * If BTRFS flips readonly due to some impossible error |
| 1916 | * (fs_info->fs_state now has BTRFS_SUPER_FLAG_ERROR), |
| 1917 | * although we have opened a file as writable, we have |
| 1918 | * to stop this write operation to ensure FS consistency. |
| 1919 | */ |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1920 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 1921 | inode_unlock(inode); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1922 | err = -EROFS; |
| 1923 | goto out; |
| 1924 | } |
| 1925 | |
Josef Bacik | 6c760c0 | 2012-11-09 10:53:21 -0500 | [diff] [blame] | 1926 | /* |
| 1927 | * We reserve space for updating the inode when we reserve space for the |
| 1928 | * extent we are going to write, so we will enospc out there. We don't |
| 1929 | * need to start yet another transaction to update the inode as we will |
| 1930 | * update the inode when we finish writing whatever data we write. |
| 1931 | */ |
| 1932 | update_time_for_write(inode); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1933 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1934 | start_pos = round_down(pos, fs_info->sectorsize); |
Chandan Rajendra | 27772b6 | 2016-01-21 15:56:03 +0530 | [diff] [blame] | 1935 | oldsize = i_size_read(inode); |
| 1936 | if (start_pos > oldsize) { |
Qu Wenruo | 3ac0d7b | 2014-03-27 02:51:58 +0000 | [diff] [blame] | 1937 | /* Expand hole size to cover write data, preventing empty gap */ |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 1938 | end_pos = round_up(pos + count, |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1939 | fs_info->sectorsize); |
Chandan Rajendra | 27772b6 | 2016-01-21 15:56:03 +0530 | [diff] [blame] | 1940 | err = btrfs_cont_expand(inode, oldsize, end_pos); |
Miao Xie | 0c1a98c | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1941 | if (err) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 1942 | inode_unlock(inode); |
Miao Xie | 0c1a98c | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1943 | goto out; |
| 1944 | } |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 1945 | if (start_pos > round_up(oldsize, fs_info->sectorsize)) |
Chandan Rajendra | 27772b6 | 2016-01-21 15:56:03 +0530 | [diff] [blame] | 1946 | clean_page = 1; |
Miao Xie | 0c1a98c | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1947 | } |
| 1948 | |
Josef Bacik | b812ce2 | 2012-11-16 13:56:32 -0500 | [diff] [blame] | 1949 | if (sync) |
| 1950 | atomic_inc(&BTRFS_I(inode)->sync_writers); |
| 1951 | |
Al Viro | 2ba48ce | 2015-04-09 13:52:01 -0400 | [diff] [blame] | 1952 | if (iocb->ki_flags & IOCB_DIRECT) { |
Christoph Hellwig | 1af5bb4 | 2016-04-07 08:51:56 -0700 | [diff] [blame] | 1953 | num_written = __btrfs_direct_write(iocb, from); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1954 | } else { |
Al Viro | b30ac0f | 2014-04-03 14:29:04 -0400 | [diff] [blame] | 1955 | num_written = __btrfs_buffered_write(file, from, pos); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1956 | if (num_written > 0) |
Al Viro | 867c4f9 | 2014-02-11 19:31:06 -0500 | [diff] [blame] | 1957 | iocb->ki_pos = pos + num_written; |
Chandan Rajendra | 27772b6 | 2016-01-21 15:56:03 +0530 | [diff] [blame] | 1958 | if (clean_page) |
| 1959 | pagecache_isize_extended(inode, oldsize, |
| 1960 | i_size_read(inode)); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1961 | } |
| 1962 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 1963 | inode_unlock(inode); |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 1964 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1965 | /* |
Josef Bacik | 6c760c0 | 2012-11-09 10:53:21 -0500 | [diff] [blame] | 1966 | * We also have to set last_sub_trans to the current log transid, |
| 1967 | * otherwise subsequent syncs to a file that's been synced in this |
Adam Buchbinder | bb7ab3b | 2016-03-04 11:23:12 -0800 | [diff] [blame] | 1968 | * transaction will appear to have already occurred. |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1969 | */ |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 1970 | spin_lock(&BTRFS_I(inode)->lock); |
Josef Bacik | 6c760c0 | 2012-11-09 10:53:21 -0500 | [diff] [blame] | 1971 | BTRFS_I(inode)->last_sub_trans = root->log_transid; |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 1972 | spin_unlock(&BTRFS_I(inode)->lock); |
Christoph Hellwig | e259221 | 2016-04-07 08:52:01 -0700 | [diff] [blame] | 1973 | if (num_written > 0) |
| 1974 | num_written = generic_write_sync(iocb, num_written); |
Miao Xie | 0a3404d | 2013-01-28 12:34:55 +0000 | [diff] [blame] | 1975 | |
Josef Bacik | b812ce2 | 2012-11-16 13:56:32 -0500 | [diff] [blame] | 1976 | if (sync) |
| 1977 | atomic_dec(&BTRFS_I(inode)->sync_writers); |
Miao Xie | 0a3404d | 2013-01-28 12:34:55 +0000 | [diff] [blame] | 1978 | out: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1979 | current->backing_dev_info = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1980 | return num_written ? num_written : err; |
| 1981 | } |
| 1982 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1983 | int btrfs_release_file(struct inode *inode, struct file *filp) |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 1984 | { |
Josef Bacik | 23b5ec7 | 2017-07-24 15:14:25 -0400 | [diff] [blame] | 1985 | struct btrfs_file_private *private = filp->private_data; |
| 1986 | |
Josef Bacik | 23b5ec7 | 2017-07-24 15:14:25 -0400 | [diff] [blame] | 1987 | if (private && private->filldir_buf) |
| 1988 | kfree(private->filldir_buf); |
| 1989 | kfree(private); |
| 1990 | filp->private_data = NULL; |
| 1991 | |
Chris Mason | f6dc45c | 2014-08-20 07:15:33 -0700 | [diff] [blame] | 1992 | /* |
| 1993 | * ordered_data_close is set by settattr when we are about to truncate |
| 1994 | * a file from a non-zero size to a zero size. This tries to |
| 1995 | * flush down new bytes that may have been written if the |
| 1996 | * application were using truncate to replace a file in place. |
| 1997 | */ |
| 1998 | if (test_and_clear_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
| 1999 | &BTRFS_I(inode)->runtime_flags)) |
| 2000 | filemap_flush(inode->i_mapping); |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 2001 | return 0; |
| 2002 | } |
| 2003 | |
Filipe Manana | 669249e | 2014-09-02 11:09:58 +0100 | [diff] [blame] | 2004 | static int start_ordered_ops(struct inode *inode, loff_t start, loff_t end) |
| 2005 | { |
| 2006 | int ret; |
Liu Bo | 343e4fc | 2017-11-15 16:10:28 -0700 | [diff] [blame] | 2007 | struct blk_plug plug; |
Filipe Manana | 669249e | 2014-09-02 11:09:58 +0100 | [diff] [blame] | 2008 | |
Liu Bo | 343e4fc | 2017-11-15 16:10:28 -0700 | [diff] [blame] | 2009 | /* |
| 2010 | * This is only called in fsync, which would do synchronous writes, so |
| 2011 | * a plug can merge adjacent IOs as much as possible. Esp. in case of |
| 2012 | * multiple disks using raid profile, a large IO can be split to |
| 2013 | * several segments of stripe length (currently 64K). |
| 2014 | */ |
| 2015 | blk_start_plug(&plug); |
Filipe Manana | 669249e | 2014-09-02 11:09:58 +0100 | [diff] [blame] | 2016 | atomic_inc(&BTRFS_I(inode)->sync_writers); |
Filipe Manana | 728404d | 2014-10-10 09:43:11 +0100 | [diff] [blame] | 2017 | ret = btrfs_fdatawrite_range(inode, start, end); |
Filipe Manana | 669249e | 2014-09-02 11:09:58 +0100 | [diff] [blame] | 2018 | atomic_dec(&BTRFS_I(inode)->sync_writers); |
Liu Bo | 343e4fc | 2017-11-15 16:10:28 -0700 | [diff] [blame] | 2019 | blk_finish_plug(&plug); |
Filipe Manana | 669249e | 2014-09-02 11:09:58 +0100 | [diff] [blame] | 2020 | |
| 2021 | return ret; |
| 2022 | } |
| 2023 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2024 | /* |
| 2025 | * fsync call for both files and directories. This logs the inode into |
| 2026 | * the tree log instead of forcing full commits whenever possible. |
| 2027 | * |
| 2028 | * It needs to call filemap_fdatawait so that all ordered extent updates are |
| 2029 | * in the metadata btree are up to date for copying to the log. |
| 2030 | * |
| 2031 | * It drops the inode mutex before doing the tree log commit. This is an |
| 2032 | * important optimization for directories because holding the mutex prevents |
| 2033 | * new operations on the dir while we write to disk. |
| 2034 | */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2035 | int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2036 | { |
Filipe Manana | de17e79 | 2016-03-30 19:03:13 -0400 | [diff] [blame] | 2037 | struct dentry *dentry = file_dentry(file); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2038 | struct inode *inode = d_inode(dentry); |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2039 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2040 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2041 | struct btrfs_trans_handle *trans; |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2042 | struct btrfs_log_ctx ctx; |
Jeff Layton | 333427a | 2017-07-06 07:02:31 -0400 | [diff] [blame] | 2043 | int ret = 0, err; |
David Sterba | 9dcbeed | 2015-11-09 11:44:45 +0100 | [diff] [blame] | 2044 | u64 len; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2045 | |
David Sterba | 9dcbeed | 2015-11-09 11:44:45 +0100 | [diff] [blame] | 2046 | /* |
| 2047 | * The range length can be represented by u64, we have to do the typecasts |
| 2048 | * to avoid signed overflow if it's [0, LLONG_MAX] eg. from fsync() |
| 2049 | */ |
| 2050 | len = (u64)end - (u64)start + 1; |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 2051 | trace_btrfs_sync_file(file, datasync); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 2052 | |
Liu Bo | ebb7044 | 2017-11-21 14:35:40 -0700 | [diff] [blame] | 2053 | btrfs_init_log_ctx(&ctx, inode); |
| 2054 | |
Miao Xie | 90abccf | 2012-09-13 04:53:47 -0600 | [diff] [blame] | 2055 | /* |
| 2056 | * We write the dirty pages in the range and wait until they complete |
| 2057 | * out of the ->i_mutex. If so, we can flush the dirty pages by |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 2058 | * multi-task, and make the performance up. See |
| 2059 | * btrfs_wait_ordered_range for an explanation of the ASYNC check. |
Miao Xie | 90abccf | 2012-09-13 04:53:47 -0600 | [diff] [blame] | 2060 | */ |
Filipe Manana | 669249e | 2014-09-02 11:09:58 +0100 | [diff] [blame] | 2061 | ret = start_ordered_ops(inode, start, end); |
Miao Xie | 90abccf | 2012-09-13 04:53:47 -0600 | [diff] [blame] | 2062 | if (ret) |
Jeff Layton | 333427a | 2017-07-06 07:02:31 -0400 | [diff] [blame] | 2063 | goto out; |
Miao Xie | 90abccf | 2012-09-13 04:53:47 -0600 | [diff] [blame] | 2064 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2065 | inode_lock(inode); |
Miao Xie | 2ecb792 | 2012-09-06 04:04:27 -0600 | [diff] [blame] | 2066 | atomic_inc(&root->log_batch); |
Josef Bacik | b5e6c3e | 2018-05-23 11:58:33 -0400 | [diff] [blame] | 2067 | |
Filipe Manana | 669249e | 2014-09-02 11:09:58 +0100 | [diff] [blame] | 2068 | /* |
Josef Bacik | b5e6c3e | 2018-05-23 11:58:33 -0400 | [diff] [blame] | 2069 | * We have to do this here to avoid the priority inversion of waiting on |
| 2070 | * IO of a lower priority task while holding a transaciton open. |
Filipe Manana | 669249e | 2014-09-02 11:09:58 +0100 | [diff] [blame] | 2071 | */ |
Josef Bacik | b5e6c3e | 2018-05-23 11:58:33 -0400 | [diff] [blame] | 2072 | ret = btrfs_wait_ordered_range(inode, start, len); |
Filipe Manana | 669249e | 2014-09-02 11:09:58 +0100 | [diff] [blame] | 2073 | if (ret) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2074 | inode_unlock(inode); |
Filipe Manana | 669249e | 2014-09-02 11:09:58 +0100 | [diff] [blame] | 2075 | goto out; |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 2076 | } |
Miao Xie | 2ecb792 | 2012-09-06 04:04:27 -0600 | [diff] [blame] | 2077 | atomic_inc(&root->log_batch); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 2078 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 2079 | smp_mb(); |
Nikolay Borisov | 0f8939b | 2017-01-18 00:31:30 +0200 | [diff] [blame] | 2080 | if (btrfs_inode_in_log(BTRFS_I(inode), fs_info->generation) || |
David Sterba | ca5788a | 2018-07-19 15:27:46 +0200 | [diff] [blame] | 2081 | BTRFS_I(inode)->last_trans <= fs_info->last_trans_committed) { |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 2082 | /* |
Nicholas D Steeves | 0132761 | 2016-05-19 21:18:45 -0400 | [diff] [blame] | 2083 | * We've had everything committed since the last time we were |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 2084 | * modified so clear this flag in case it was set for whatever |
| 2085 | * reason, it's no longer relevant. |
| 2086 | */ |
| 2087 | clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 2088 | &BTRFS_I(inode)->runtime_flags); |
Filipe Manana | 0596a90 | 2016-06-14 14:18:27 +0100 | [diff] [blame] | 2089 | /* |
| 2090 | * An ordered extent might have started before and completed |
| 2091 | * already with io errors, in which case the inode was not |
| 2092 | * updated and we end up here. So check the inode's mapping |
Jeff Layton | 333427a | 2017-07-06 07:02:31 -0400 | [diff] [blame] | 2093 | * for any errors that might have happened since we last |
| 2094 | * checked called fsync. |
Filipe Manana | 0596a90 | 2016-06-14 14:18:27 +0100 | [diff] [blame] | 2095 | */ |
Jeff Layton | 333427a | 2017-07-06 07:02:31 -0400 | [diff] [blame] | 2096 | ret = filemap_check_wb_err(inode->i_mapping, file->f_wb_err); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2097 | inode_unlock(inode); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 2098 | goto out; |
| 2099 | } |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 2100 | |
| 2101 | /* |
Josef Bacik | 5039edd | 2014-01-15 13:34:13 -0500 | [diff] [blame] | 2102 | * We use start here because we will need to wait on the IO to complete |
| 2103 | * in btrfs_sync_log, which could require joining a transaction (for |
| 2104 | * example checking cross references in the nocow path). If we use join |
| 2105 | * here we could get into a situation where we're waiting on IO to |
| 2106 | * happen that is blocked on a transaction trying to commit. With start |
| 2107 | * we inc the extwriter counter, so we wait for all extwriters to exit |
| 2108 | * before we start blocking join'ers. This comment is to keep somebody |
| 2109 | * from thinking they are super smart and changing this to |
| 2110 | * btrfs_join_transaction *cough*Josef*cough*. |
| 2111 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2112 | trans = btrfs_start_transaction(root, 0); |
| 2113 | if (IS_ERR(trans)) { |
| 2114 | ret = PTR_ERR(trans); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2115 | inode_unlock(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2116 | goto out; |
| 2117 | } |
Josef Bacik | 5039edd | 2014-01-15 13:34:13 -0500 | [diff] [blame] | 2118 | trans->sync = true; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2119 | |
Nikolay Borisov | e5b84f7a | 2018-02-27 17:37:18 +0200 | [diff] [blame] | 2120 | ret = btrfs_log_dentry_safe(trans, dentry, start, end, &ctx); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2121 | if (ret < 0) { |
Filipe David Borba Manana | a0634be | 2013-09-11 20:36:44 +0100 | [diff] [blame] | 2122 | /* Fallthrough and commit/free transaction. */ |
| 2123 | ret = 1; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 2124 | } |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 2125 | |
| 2126 | /* we've logged all the items and now have a consistent |
| 2127 | * version of the file in the log. It is possible that |
| 2128 | * someone will come in and modify the file, but that's |
| 2129 | * fine because the log is consistent on disk, and we |
| 2130 | * have references to all of the file's extents |
| 2131 | * |
| 2132 | * It is possible that someone will come in and log the |
| 2133 | * file again, but that will end up using the synchronization |
| 2134 | * inside btrfs_sync_log to keep things safe. |
| 2135 | */ |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2136 | inode_unlock(inode); |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 2137 | |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 2138 | /* |
| 2139 | * If any of the ordered extents had an error, just return it to user |
| 2140 | * space, so that the application knows some writes didn't succeed and |
| 2141 | * can take proper action (retry for e.g.). Blindly committing the |
| 2142 | * transaction in this case, would fool userspace that everything was |
| 2143 | * successful. And we also want to make sure our log doesn't contain |
| 2144 | * file extent items pointing to extents that weren't fully written to - |
| 2145 | * just like in the non fast fsync path, where we check for the ordered |
| 2146 | * operation's error flag before writing to the log tree and return -EIO |
| 2147 | * if any of them had this flag set (btrfs_wait_ordered_range) - |
| 2148 | * therefore we need to check for errors in the ordered operations, |
| 2149 | * which are indicated by ctx.io_err. |
| 2150 | */ |
| 2151 | if (ctx.io_err) { |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 2152 | btrfs_end_transaction(trans); |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 2153 | ret = ctx.io_err; |
| 2154 | goto out; |
| 2155 | } |
| 2156 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 2157 | if (ret != BTRFS_NO_LOG_SYNC) { |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 2158 | if (!ret) { |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2159 | ret = btrfs_sync_log(trans, root, &ctx); |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 2160 | if (!ret) { |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 2161 | ret = btrfs_end_transaction(trans); |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 2162 | goto out; |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 2163 | } |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 2164 | } |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 2165 | ret = btrfs_commit_transaction(trans); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 2166 | } else { |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 2167 | ret = btrfs_end_transaction(trans); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2168 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2169 | out: |
Liu Bo | ebb7044 | 2017-11-21 14:35:40 -0700 | [diff] [blame] | 2170 | ASSERT(list_empty(&ctx.list)); |
Jeff Layton | 333427a | 2017-07-06 07:02:31 -0400 | [diff] [blame] | 2171 | err = file_check_and_advance_wb_err(file); |
| 2172 | if (!ret) |
| 2173 | ret = err; |
Roel Kluin | 014e4ac | 2010-01-29 10:42:11 +0000 | [diff] [blame] | 2174 | return ret > 0 ? -EIO : ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2175 | } |
| 2176 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 2177 | static const struct vm_operations_struct btrfs_file_vm_ops = { |
Chris Mason | 92fee66 | 2007-07-25 12:31:35 -0400 | [diff] [blame] | 2178 | .fault = filemap_fault, |
Kirill A. Shutemov | f182036 | 2014-04-07 15:37:19 -0700 | [diff] [blame] | 2179 | .map_pages = filemap_map_pages, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 2180 | .page_mkwrite = btrfs_page_mkwrite, |
| 2181 | }; |
| 2182 | |
| 2183 | static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) |
| 2184 | { |
Miao Xie | 058a457 | 2010-05-20 07:21:50 +0000 | [diff] [blame] | 2185 | struct address_space *mapping = filp->f_mapping; |
| 2186 | |
| 2187 | if (!mapping->a_ops->readpage) |
| 2188 | return -ENOEXEC; |
| 2189 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 2190 | file_accessed(filp); |
Miao Xie | 058a457 | 2010-05-20 07:21:50 +0000 | [diff] [blame] | 2191 | vma->vm_ops = &btrfs_file_vm_ops; |
Miao Xie | 058a457 | 2010-05-20 07:21:50 +0000 | [diff] [blame] | 2192 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 2193 | return 0; |
| 2194 | } |
| 2195 | |
Nikolay Borisov | 35339c2 | 2017-02-20 13:50:46 +0200 | [diff] [blame] | 2196 | static int hole_mergeable(struct btrfs_inode *inode, struct extent_buffer *leaf, |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2197 | int slot, u64 start, u64 end) |
| 2198 | { |
| 2199 | struct btrfs_file_extent_item *fi; |
| 2200 | struct btrfs_key key; |
| 2201 | |
| 2202 | if (slot < 0 || slot >= btrfs_header_nritems(leaf)) |
| 2203 | return 0; |
| 2204 | |
| 2205 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Nikolay Borisov | 35339c2 | 2017-02-20 13:50:46 +0200 | [diff] [blame] | 2206 | if (key.objectid != btrfs_ino(inode) || |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2207 | key.type != BTRFS_EXTENT_DATA_KEY) |
| 2208 | return 0; |
| 2209 | |
| 2210 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| 2211 | |
| 2212 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG) |
| 2213 | return 0; |
| 2214 | |
| 2215 | if (btrfs_file_extent_disk_bytenr(leaf, fi)) |
| 2216 | return 0; |
| 2217 | |
| 2218 | if (key.offset == end) |
| 2219 | return 1; |
| 2220 | if (key.offset + btrfs_file_extent_num_bytes(leaf, fi) == start) |
| 2221 | return 1; |
| 2222 | return 0; |
| 2223 | } |
| 2224 | |
Nikolay Borisov | a012a74 | 2017-02-20 13:50:47 +0200 | [diff] [blame] | 2225 | static int fill_holes(struct btrfs_trans_handle *trans, |
| 2226 | struct btrfs_inode *inode, |
| 2227 | struct btrfs_path *path, u64 offset, u64 end) |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2228 | { |
Nikolay Borisov | a012a74 | 2017-02-20 13:50:47 +0200 | [diff] [blame] | 2229 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb); |
| 2230 | struct btrfs_root *root = inode->root; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2231 | struct extent_buffer *leaf; |
| 2232 | struct btrfs_file_extent_item *fi; |
| 2233 | struct extent_map *hole_em; |
Nikolay Borisov | a012a74 | 2017-02-20 13:50:47 +0200 | [diff] [blame] | 2234 | struct extent_map_tree *em_tree = &inode->extent_tree; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2235 | struct btrfs_key key; |
| 2236 | int ret; |
| 2237 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2238 | if (btrfs_fs_incompat(fs_info, NO_HOLES)) |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 2239 | goto out; |
| 2240 | |
Nikolay Borisov | a012a74 | 2017-02-20 13:50:47 +0200 | [diff] [blame] | 2241 | key.objectid = btrfs_ino(inode); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2242 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 2243 | key.offset = offset; |
| 2244 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2245 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
Josef Bacik | f94480b | 2016-11-14 14:06:22 -0500 | [diff] [blame] | 2246 | if (ret <= 0) { |
| 2247 | /* |
| 2248 | * We should have dropped this offset, so if we find it then |
| 2249 | * something has gone horribly wrong. |
| 2250 | */ |
| 2251 | if (ret == 0) |
| 2252 | ret = -EINVAL; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2253 | return ret; |
Josef Bacik | f94480b | 2016-11-14 14:06:22 -0500 | [diff] [blame] | 2254 | } |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2255 | |
| 2256 | leaf = path->nodes[0]; |
Nikolay Borisov | a012a74 | 2017-02-20 13:50:47 +0200 | [diff] [blame] | 2257 | if (hole_mergeable(inode, leaf, path->slots[0] - 1, offset, end)) { |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2258 | u64 num_bytes; |
| 2259 | |
| 2260 | path->slots[0]--; |
| 2261 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 2262 | struct btrfs_file_extent_item); |
| 2263 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi) + |
| 2264 | end - offset; |
| 2265 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); |
| 2266 | btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes); |
| 2267 | btrfs_set_file_extent_offset(leaf, fi, 0); |
| 2268 | btrfs_mark_buffer_dirty(leaf); |
| 2269 | goto out; |
| 2270 | } |
| 2271 | |
chandan | 1707e26 | 2014-07-01 12:04:28 +0530 | [diff] [blame] | 2272 | if (hole_mergeable(inode, leaf, path->slots[0], offset, end)) { |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2273 | u64 num_bytes; |
| 2274 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2275 | key.offset = offset; |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2276 | btrfs_set_item_key_safe(fs_info, path, &key); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2277 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 2278 | struct btrfs_file_extent_item); |
| 2279 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi) + end - |
| 2280 | offset; |
| 2281 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); |
| 2282 | btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes); |
| 2283 | btrfs_set_file_extent_offset(leaf, fi, 0); |
| 2284 | btrfs_mark_buffer_dirty(leaf); |
| 2285 | goto out; |
| 2286 | } |
| 2287 | btrfs_release_path(path); |
| 2288 | |
Nikolay Borisov | a012a74 | 2017-02-20 13:50:47 +0200 | [diff] [blame] | 2289 | ret = btrfs_insert_file_extent(trans, root, btrfs_ino(inode), |
David Sterba | f85b737 | 2017-01-20 14:54:07 +0100 | [diff] [blame] | 2290 | offset, 0, 0, end - offset, 0, end - offset, 0, 0, 0); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2291 | if (ret) |
| 2292 | return ret; |
| 2293 | |
| 2294 | out: |
| 2295 | btrfs_release_path(path); |
| 2296 | |
| 2297 | hole_em = alloc_extent_map(); |
| 2298 | if (!hole_em) { |
| 2299 | btrfs_drop_extent_cache(inode, offset, end - 1, 0); |
Nikolay Borisov | a012a74 | 2017-02-20 13:50:47 +0200 | [diff] [blame] | 2300 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2301 | } else { |
| 2302 | hole_em->start = offset; |
| 2303 | hole_em->len = end - offset; |
Josef Bacik | cc95bef | 2013-04-04 14:31:27 -0400 | [diff] [blame] | 2304 | hole_em->ram_bytes = hole_em->len; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2305 | hole_em->orig_start = offset; |
| 2306 | |
| 2307 | hole_em->block_start = EXTENT_MAP_HOLE; |
| 2308 | hole_em->block_len = 0; |
Josef Bacik | b493968 | 2012-12-03 10:31:19 -0500 | [diff] [blame] | 2309 | hole_em->orig_block_len = 0; |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2310 | hole_em->bdev = fs_info->fs_devices->latest_bdev; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2311 | hole_em->compress_type = BTRFS_COMPRESS_NONE; |
| 2312 | hole_em->generation = trans->transid; |
| 2313 | |
| 2314 | do { |
| 2315 | btrfs_drop_extent_cache(inode, offset, end - 1, 0); |
| 2316 | write_lock(&em_tree->lock); |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 2317 | ret = add_extent_mapping(em_tree, hole_em, 1); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2318 | write_unlock(&em_tree->lock); |
| 2319 | } while (ret == -EEXIST); |
| 2320 | free_extent_map(hole_em); |
| 2321 | if (ret) |
| 2322 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
Nikolay Borisov | a012a74 | 2017-02-20 13:50:47 +0200 | [diff] [blame] | 2323 | &inode->runtime_flags); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2324 | } |
| 2325 | |
| 2326 | return 0; |
| 2327 | } |
| 2328 | |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2329 | /* |
| 2330 | * Find a hole extent on given inode and change start/len to the end of hole |
| 2331 | * extent.(hole/vacuum extent whose em->start <= start && |
| 2332 | * em->start + em->len > start) |
| 2333 | * When a hole extent is found, return 1 and modify start/len. |
| 2334 | */ |
| 2335 | static int find_first_non_hole(struct inode *inode, u64 *start, u64 *len) |
| 2336 | { |
Filipe Manana | 609805d | 2017-05-30 05:29:09 +0100 | [diff] [blame] | 2337 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2338 | struct extent_map *em; |
| 2339 | int ret = 0; |
| 2340 | |
Filipe Manana | 609805d | 2017-05-30 05:29:09 +0100 | [diff] [blame] | 2341 | em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, |
| 2342 | round_down(*start, fs_info->sectorsize), |
| 2343 | round_up(*len, fs_info->sectorsize), 0); |
Dan Carpenter | 9986277 | 2017-04-11 11:57:15 +0300 | [diff] [blame] | 2344 | if (IS_ERR(em)) |
| 2345 | return PTR_ERR(em); |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2346 | |
| 2347 | /* Hole or vacuum extent(only exists in no-hole mode) */ |
| 2348 | if (em->block_start == EXTENT_MAP_HOLE) { |
| 2349 | ret = 1; |
| 2350 | *len = em->start + em->len > *start + *len ? |
| 2351 | 0 : *start + *len - em->start - em->len; |
| 2352 | *start = em->start + em->len; |
| 2353 | } |
| 2354 | free_extent_map(em); |
| 2355 | return ret; |
| 2356 | } |
| 2357 | |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2358 | static int btrfs_punch_hole_lock_range(struct inode *inode, |
| 2359 | const u64 lockstart, |
| 2360 | const u64 lockend, |
| 2361 | struct extent_state **cached_state) |
| 2362 | { |
| 2363 | while (1) { |
| 2364 | struct btrfs_ordered_extent *ordered; |
| 2365 | int ret; |
| 2366 | |
| 2367 | truncate_pagecache_range(inode, lockstart, lockend); |
| 2368 | |
| 2369 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 2370 | cached_state); |
| 2371 | ordered = btrfs_lookup_first_ordered_extent(inode, lockend); |
| 2372 | |
| 2373 | /* |
| 2374 | * We need to make sure we have no ordered extents in this range |
| 2375 | * and nobody raced in and read a page in this range, if we did |
| 2376 | * we need to try again. |
| 2377 | */ |
| 2378 | if ((!ordered || |
| 2379 | (ordered->file_offset + ordered->len <= lockstart || |
| 2380 | ordered->file_offset > lockend)) && |
David Sterba | 051c98e | 2018-03-07 15:33:22 +0100 | [diff] [blame] | 2381 | !filemap_range_has_page(inode->i_mapping, |
| 2382 | lockstart, lockend)) { |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2383 | if (ordered) |
| 2384 | btrfs_put_ordered_extent(ordered); |
| 2385 | break; |
| 2386 | } |
| 2387 | if (ordered) |
| 2388 | btrfs_put_ordered_extent(ordered); |
| 2389 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, |
| 2390 | lockend, cached_state); |
| 2391 | ret = btrfs_wait_ordered_range(inode, lockstart, |
| 2392 | lockend - lockstart + 1); |
| 2393 | if (ret) |
| 2394 | return ret; |
| 2395 | } |
| 2396 | return 0; |
| 2397 | } |
| 2398 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2399 | static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) |
| 2400 | { |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2401 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2402 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2403 | struct extent_state *cached_state = NULL; |
| 2404 | struct btrfs_path *path; |
| 2405 | struct btrfs_block_rsv *rsv; |
| 2406 | struct btrfs_trans_handle *trans; |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2407 | u64 lockstart; |
| 2408 | u64 lockend; |
| 2409 | u64 tail_start; |
| 2410 | u64 tail_len; |
| 2411 | u64 orig_start = offset; |
| 2412 | u64 cur_offset; |
Chris Mason | 5f52a2c | 2016-12-13 09:14:42 -0800 | [diff] [blame] | 2413 | u64 min_size = btrfs_calc_trans_metadata_size(fs_info, 1); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2414 | u64 drop_end; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2415 | int ret = 0; |
| 2416 | int err = 0; |
Alexandru Moise | 6e4d6fa | 2015-09-22 21:00:07 +0000 | [diff] [blame] | 2417 | unsigned int rsv_count; |
Chandan Rajendra | 9703fef | 2016-01-21 15:55:56 +0530 | [diff] [blame] | 2418 | bool same_block; |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2419 | bool no_holes = btrfs_fs_incompat(fs_info, NO_HOLES); |
Filipe Manana | a1a50f6 | 2014-04-26 01:35:31 +0100 | [diff] [blame] | 2420 | u64 ino_size; |
Chandan Rajendra | 9703fef | 2016-01-21 15:55:56 +0530 | [diff] [blame] | 2421 | bool truncated_block = false; |
Filipe Manana | e8c1c76 | 2015-02-15 22:38:54 +0000 | [diff] [blame] | 2422 | bool updated_inode = false; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2423 | |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 2424 | ret = btrfs_wait_ordered_range(inode, offset, len); |
| 2425 | if (ret) |
| 2426 | return ret; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2427 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2428 | inode_lock(inode); |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2429 | ino_size = round_up(inode->i_size, fs_info->sectorsize); |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2430 | ret = find_first_non_hole(inode, &offset, &len); |
| 2431 | if (ret < 0) |
| 2432 | goto out_only_mutex; |
| 2433 | if (ret && !len) { |
| 2434 | /* Already in a large hole */ |
| 2435 | ret = 0; |
| 2436 | goto out_only_mutex; |
| 2437 | } |
| 2438 | |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 2439 | lockstart = round_up(offset, btrfs_inode_sectorsize(inode)); |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2440 | lockend = round_down(offset + len, |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 2441 | btrfs_inode_sectorsize(inode)) - 1; |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2442 | same_block = (BTRFS_BYTES_TO_BLKS(fs_info, offset)) |
| 2443 | == (BTRFS_BYTES_TO_BLKS(fs_info, offset + len - 1)); |
Miao Xie | 7426cc0 | 2012-12-05 10:54:52 +0000 | [diff] [blame] | 2444 | /* |
Chandan Rajendra | 9703fef | 2016-01-21 15:55:56 +0530 | [diff] [blame] | 2445 | * We needn't truncate any block which is beyond the end of the file |
Miao Xie | 7426cc0 | 2012-12-05 10:54:52 +0000 | [diff] [blame] | 2446 | * because we are sure there is no data there. |
| 2447 | */ |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2448 | /* |
Chandan Rajendra | 9703fef | 2016-01-21 15:55:56 +0530 | [diff] [blame] | 2449 | * Only do this if we are in the same block and we aren't doing the |
| 2450 | * entire block. |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2451 | */ |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2452 | if (same_block && len < fs_info->sectorsize) { |
Filipe Manana | e8c1c76 | 2015-02-15 22:38:54 +0000 | [diff] [blame] | 2453 | if (offset < ino_size) { |
Chandan Rajendra | 9703fef | 2016-01-21 15:55:56 +0530 | [diff] [blame] | 2454 | truncated_block = true; |
| 2455 | ret = btrfs_truncate_block(inode, offset, len, 0); |
Filipe Manana | e8c1c76 | 2015-02-15 22:38:54 +0000 | [diff] [blame] | 2456 | } else { |
| 2457 | ret = 0; |
| 2458 | } |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2459 | goto out_only_mutex; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2460 | } |
| 2461 | |
Chandan Rajendra | 9703fef | 2016-01-21 15:55:56 +0530 | [diff] [blame] | 2462 | /* zero back part of the first block */ |
Filipe Manana | 12870f1 | 2014-02-15 15:55:58 +0000 | [diff] [blame] | 2463 | if (offset < ino_size) { |
Chandan Rajendra | 9703fef | 2016-01-21 15:55:56 +0530 | [diff] [blame] | 2464 | truncated_block = true; |
| 2465 | ret = btrfs_truncate_block(inode, offset, 0, 0); |
Miao Xie | 7426cc0 | 2012-12-05 10:54:52 +0000 | [diff] [blame] | 2466 | if (ret) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2467 | inode_unlock(inode); |
Miao Xie | 7426cc0 | 2012-12-05 10:54:52 +0000 | [diff] [blame] | 2468 | return ret; |
| 2469 | } |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2470 | } |
| 2471 | |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2472 | /* Check the aligned pages after the first unaligned page, |
| 2473 | * if offset != orig_start, which means the first unaligned page |
Nicholas D Steeves | 0132761 | 2016-05-19 21:18:45 -0400 | [diff] [blame] | 2474 | * including several following pages are already in holes, |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2475 | * the extra check can be skipped */ |
| 2476 | if (offset == orig_start) { |
| 2477 | /* after truncate page, check hole again */ |
| 2478 | len = offset + len - lockstart; |
| 2479 | offset = lockstart; |
| 2480 | ret = find_first_non_hole(inode, &offset, &len); |
| 2481 | if (ret < 0) |
| 2482 | goto out_only_mutex; |
| 2483 | if (ret && !len) { |
| 2484 | ret = 0; |
| 2485 | goto out_only_mutex; |
| 2486 | } |
| 2487 | lockstart = offset; |
| 2488 | } |
| 2489 | |
| 2490 | /* Check the tail unaligned part is in a hole */ |
| 2491 | tail_start = lockend + 1; |
| 2492 | tail_len = offset + len - tail_start; |
| 2493 | if (tail_len) { |
| 2494 | ret = find_first_non_hole(inode, &tail_start, &tail_len); |
| 2495 | if (unlikely(ret < 0)) |
| 2496 | goto out_only_mutex; |
| 2497 | if (!ret) { |
| 2498 | /* zero the front end of the last page */ |
| 2499 | if (tail_start + tail_len < ino_size) { |
Chandan Rajendra | 9703fef | 2016-01-21 15:55:56 +0530 | [diff] [blame] | 2500 | truncated_block = true; |
| 2501 | ret = btrfs_truncate_block(inode, |
| 2502 | tail_start + tail_len, |
| 2503 | 0, 1); |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2504 | if (ret) |
| 2505 | goto out_only_mutex; |
Qu Wenruo | 51f395a | 2014-08-08 13:06:20 +0800 | [diff] [blame] | 2506 | } |
Miao Xie | 0061280 | 2012-12-05 10:54:12 +0000 | [diff] [blame] | 2507 | } |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2508 | } |
| 2509 | |
| 2510 | if (lockend < lockstart) { |
Filipe Manana | e8c1c76 | 2015-02-15 22:38:54 +0000 | [diff] [blame] | 2511 | ret = 0; |
| 2512 | goto out_only_mutex; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2513 | } |
| 2514 | |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2515 | ret = btrfs_punch_hole_lock_range(inode, lockstart, lockend, |
| 2516 | &cached_state); |
| 2517 | if (ret) { |
| 2518 | inode_unlock(inode); |
| 2519 | goto out_only_mutex; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2520 | } |
| 2521 | |
| 2522 | path = btrfs_alloc_path(); |
| 2523 | if (!path) { |
| 2524 | ret = -ENOMEM; |
| 2525 | goto out; |
| 2526 | } |
| 2527 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 2528 | rsv = btrfs_alloc_block_rsv(fs_info, BTRFS_BLOCK_RSV_TEMP); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2529 | if (!rsv) { |
| 2530 | ret = -ENOMEM; |
| 2531 | goto out_free; |
| 2532 | } |
Chris Mason | 5f52a2c | 2016-12-13 09:14:42 -0800 | [diff] [blame] | 2533 | rsv->size = btrfs_calc_trans_metadata_size(fs_info, 1); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2534 | rsv->failfast = 1; |
| 2535 | |
| 2536 | /* |
| 2537 | * 1 - update the inode |
| 2538 | * 1 - removing the extents in the range |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 2539 | * 1 - adding the hole extent if no_holes isn't set |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2540 | */ |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 2541 | rsv_count = no_holes ? 2 : 3; |
| 2542 | trans = btrfs_start_transaction(root, rsv_count); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2543 | if (IS_ERR(trans)) { |
| 2544 | err = PTR_ERR(trans); |
| 2545 | goto out_free; |
| 2546 | } |
| 2547 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2548 | ret = btrfs_block_rsv_migrate(&fs_info->trans_block_rsv, rsv, |
Josef Bacik | 25d609f | 2016-03-25 13:25:48 -0400 | [diff] [blame] | 2549 | min_size, 0); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2550 | BUG_ON(ret); |
| 2551 | trans->block_rsv = rsv; |
| 2552 | |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2553 | cur_offset = lockstart; |
| 2554 | len = lockend - cur_offset; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2555 | while (cur_offset < lockend) { |
| 2556 | ret = __btrfs_drop_extents(trans, root, inode, path, |
| 2557 | cur_offset, lockend + 1, |
Filipe David Borba Manana | 1acae57 | 2014-01-07 11:42:27 +0000 | [diff] [blame] | 2558 | &drop_end, 1, 0, 0, NULL); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2559 | if (ret != -ENOSPC) |
| 2560 | break; |
| 2561 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2562 | trans->block_rsv = &fs_info->trans_block_rsv; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2563 | |
Josef Bacik | 62fe51c | 2016-11-16 09:13:39 -0500 | [diff] [blame] | 2564 | if (cur_offset < drop_end && cur_offset < ino_size) { |
Nikolay Borisov | a012a74 | 2017-02-20 13:50:47 +0200 | [diff] [blame] | 2565 | ret = fill_holes(trans, BTRFS_I(inode), path, |
| 2566 | cur_offset, drop_end); |
Filipe Manana | 12870f1 | 2014-02-15 15:55:58 +0000 | [diff] [blame] | 2567 | if (ret) { |
Josef Bacik | f94480b | 2016-11-14 14:06:22 -0500 | [diff] [blame] | 2568 | /* |
| 2569 | * If we failed then we didn't insert our hole |
| 2570 | * entries for the area we dropped, so now the |
| 2571 | * fs is corrupted, so we must abort the |
| 2572 | * transaction. |
| 2573 | */ |
| 2574 | btrfs_abort_transaction(trans, ret); |
Filipe Manana | 12870f1 | 2014-02-15 15:55:58 +0000 | [diff] [blame] | 2575 | err = ret; |
| 2576 | break; |
| 2577 | } |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2578 | } |
| 2579 | |
| 2580 | cur_offset = drop_end; |
| 2581 | |
| 2582 | ret = btrfs_update_inode(trans, root, inode); |
| 2583 | if (ret) { |
| 2584 | err = ret; |
| 2585 | break; |
| 2586 | } |
| 2587 | |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 2588 | btrfs_end_transaction(trans); |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 2589 | btrfs_btree_balance_dirty(fs_info); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2590 | |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 2591 | trans = btrfs_start_transaction(root, rsv_count); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2592 | if (IS_ERR(trans)) { |
| 2593 | ret = PTR_ERR(trans); |
| 2594 | trans = NULL; |
| 2595 | break; |
| 2596 | } |
| 2597 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2598 | ret = btrfs_block_rsv_migrate(&fs_info->trans_block_rsv, |
Josef Bacik | 25d609f | 2016-03-25 13:25:48 -0400 | [diff] [blame] | 2599 | rsv, min_size, 0); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2600 | BUG_ON(ret); /* shouldn't happen */ |
| 2601 | trans->block_rsv = rsv; |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2602 | |
| 2603 | ret = find_first_non_hole(inode, &cur_offset, &len); |
| 2604 | if (unlikely(ret < 0)) |
| 2605 | break; |
| 2606 | if (ret && !len) { |
| 2607 | ret = 0; |
| 2608 | break; |
| 2609 | } |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2610 | } |
| 2611 | |
| 2612 | if (ret) { |
| 2613 | err = ret; |
| 2614 | goto out_trans; |
| 2615 | } |
| 2616 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2617 | trans->block_rsv = &fs_info->trans_block_rsv; |
Filipe Manana | fc19c5e | 2014-04-29 13:18:40 +0100 | [diff] [blame] | 2618 | /* |
Filipe Manana | 2959a32 | 2015-11-02 12:32:44 +0000 | [diff] [blame] | 2619 | * If we are using the NO_HOLES feature we might have had already an |
| 2620 | * hole that overlaps a part of the region [lockstart, lockend] and |
| 2621 | * ends at (or beyond) lockend. Since we have no file extent items to |
| 2622 | * represent holes, drop_end can be less than lockend and so we must |
| 2623 | * make sure we have an extent map representing the existing hole (the |
| 2624 | * call to __btrfs_drop_extents() might have dropped the existing extent |
| 2625 | * map representing the existing hole), otherwise the fast fsync path |
| 2626 | * will not record the existence of the hole region |
| 2627 | * [existing_hole_start, lockend]. |
| 2628 | */ |
| 2629 | if (drop_end <= lockend) |
| 2630 | drop_end = lockend + 1; |
| 2631 | /* |
Filipe Manana | fc19c5e | 2014-04-29 13:18:40 +0100 | [diff] [blame] | 2632 | * Don't insert file hole extent item if it's for a range beyond eof |
| 2633 | * (because it's useless) or if it represents a 0 bytes range (when |
| 2634 | * cur_offset == drop_end). |
| 2635 | */ |
| 2636 | if (cur_offset < ino_size && cur_offset < drop_end) { |
Nikolay Borisov | a012a74 | 2017-02-20 13:50:47 +0200 | [diff] [blame] | 2637 | ret = fill_holes(trans, BTRFS_I(inode), path, |
| 2638 | cur_offset, drop_end); |
Filipe Manana | 12870f1 | 2014-02-15 15:55:58 +0000 | [diff] [blame] | 2639 | if (ret) { |
Josef Bacik | f94480b | 2016-11-14 14:06:22 -0500 | [diff] [blame] | 2640 | /* Same comment as above. */ |
| 2641 | btrfs_abort_transaction(trans, ret); |
Filipe Manana | 12870f1 | 2014-02-15 15:55:58 +0000 | [diff] [blame] | 2642 | err = ret; |
| 2643 | goto out_trans; |
| 2644 | } |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2645 | } |
| 2646 | |
| 2647 | out_trans: |
| 2648 | if (!trans) |
| 2649 | goto out_free; |
| 2650 | |
Tsutomu Itoh | e1f5790 | 2012-11-08 04:47:33 +0000 | [diff] [blame] | 2651 | inode_inc_iversion(inode); |
Deepa Dinamani | c2050a4 | 2016-09-14 07:48:06 -0700 | [diff] [blame] | 2652 | inode->i_mtime = inode->i_ctime = current_time(inode); |
Tsutomu Itoh | e1f5790 | 2012-11-08 04:47:33 +0000 | [diff] [blame] | 2653 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 2654 | trans->block_rsv = &fs_info->trans_block_rsv; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2655 | ret = btrfs_update_inode(trans, root, inode); |
Filipe Manana | e8c1c76 | 2015-02-15 22:38:54 +0000 | [diff] [blame] | 2656 | updated_inode = true; |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 2657 | btrfs_end_transaction(trans); |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 2658 | btrfs_btree_balance_dirty(fs_info); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2659 | out_free: |
| 2660 | btrfs_free_path(path); |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 2661 | btrfs_free_block_rsv(fs_info, rsv); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2662 | out: |
| 2663 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
David Sterba | e43bbe5 | 2017-12-12 21:43:52 +0100 | [diff] [blame] | 2664 | &cached_state); |
Qu Wenruo | d778154 | 2014-05-30 15:16:10 +0800 | [diff] [blame] | 2665 | out_only_mutex: |
Chandan Rajendra | 9703fef | 2016-01-21 15:55:56 +0530 | [diff] [blame] | 2666 | if (!updated_inode && truncated_block && !ret && !err) { |
Filipe Manana | e8c1c76 | 2015-02-15 22:38:54 +0000 | [diff] [blame] | 2667 | /* |
| 2668 | * If we only end up zeroing part of a page, we still need to |
| 2669 | * update the inode item, so that all the time fields are |
| 2670 | * updated as well as the necessary btrfs inode in memory fields |
| 2671 | * for detecting, at fsync time, if the inode isn't yet in the |
| 2672 | * log tree or it's there but not up to date. |
| 2673 | */ |
| 2674 | trans = btrfs_start_transaction(root, 1); |
| 2675 | if (IS_ERR(trans)) { |
| 2676 | err = PTR_ERR(trans); |
| 2677 | } else { |
| 2678 | err = btrfs_update_inode(trans, root, inode); |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 2679 | ret = btrfs_end_transaction(trans); |
Filipe Manana | e8c1c76 | 2015-02-15 22:38:54 +0000 | [diff] [blame] | 2680 | } |
| 2681 | } |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 2682 | inode_unlock(inode); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2683 | if (ret && !err) |
| 2684 | err = ret; |
| 2685 | return err; |
| 2686 | } |
| 2687 | |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 2688 | /* Helper structure to record which range is already reserved */ |
| 2689 | struct falloc_range { |
| 2690 | struct list_head list; |
| 2691 | u64 start; |
| 2692 | u64 len; |
| 2693 | }; |
| 2694 | |
| 2695 | /* |
| 2696 | * Helper function to add falloc range |
| 2697 | * |
| 2698 | * Caller should have locked the larger range of extent containing |
| 2699 | * [start, len) |
| 2700 | */ |
| 2701 | static int add_falloc_range(struct list_head *head, u64 start, u64 len) |
| 2702 | { |
| 2703 | struct falloc_range *prev = NULL; |
| 2704 | struct falloc_range *range = NULL; |
| 2705 | |
| 2706 | if (list_empty(head)) |
| 2707 | goto insert; |
| 2708 | |
| 2709 | /* |
| 2710 | * As fallocate iterate by bytenr order, we only need to check |
| 2711 | * the last range. |
| 2712 | */ |
| 2713 | prev = list_entry(head->prev, struct falloc_range, list); |
| 2714 | if (prev->start + prev->len == start) { |
| 2715 | prev->len += len; |
| 2716 | return 0; |
| 2717 | } |
| 2718 | insert: |
David Sterba | 32fc932 | 2016-02-11 14:25:38 +0100 | [diff] [blame] | 2719 | range = kmalloc(sizeof(*range), GFP_KERNEL); |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 2720 | if (!range) |
| 2721 | return -ENOMEM; |
| 2722 | range->start = start; |
| 2723 | range->len = len; |
| 2724 | list_add_tail(&range->list, head); |
| 2725 | return 0; |
| 2726 | } |
| 2727 | |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2728 | static int btrfs_fallocate_update_isize(struct inode *inode, |
| 2729 | const u64 end, |
| 2730 | const int mode) |
| 2731 | { |
| 2732 | struct btrfs_trans_handle *trans; |
| 2733 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2734 | int ret; |
| 2735 | int ret2; |
| 2736 | |
| 2737 | if (mode & FALLOC_FL_KEEP_SIZE || end <= i_size_read(inode)) |
| 2738 | return 0; |
| 2739 | |
| 2740 | trans = btrfs_start_transaction(root, 1); |
| 2741 | if (IS_ERR(trans)) |
| 2742 | return PTR_ERR(trans); |
| 2743 | |
| 2744 | inode->i_ctime = current_time(inode); |
| 2745 | i_size_write(inode, end); |
| 2746 | btrfs_ordered_update_i_size(inode, end, NULL); |
| 2747 | ret = btrfs_update_inode(trans, root, inode); |
| 2748 | ret2 = btrfs_end_transaction(trans); |
| 2749 | |
| 2750 | return ret ? ret : ret2; |
| 2751 | } |
| 2752 | |
Filipe Manana | 81fdf63 | 2018-01-18 11:34:31 +0000 | [diff] [blame] | 2753 | enum { |
| 2754 | RANGE_BOUNDARY_WRITTEN_EXTENT = 0, |
| 2755 | RANGE_BOUNDARY_PREALLOC_EXTENT = 1, |
| 2756 | RANGE_BOUNDARY_HOLE = 2, |
| 2757 | }; |
| 2758 | |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2759 | static int btrfs_zero_range_check_range_boundary(struct inode *inode, |
| 2760 | u64 offset) |
| 2761 | { |
| 2762 | const u64 sectorsize = btrfs_inode_sectorsize(inode); |
| 2763 | struct extent_map *em; |
Filipe Manana | 81fdf63 | 2018-01-18 11:34:31 +0000 | [diff] [blame] | 2764 | int ret; |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2765 | |
| 2766 | offset = round_down(offset, sectorsize); |
| 2767 | em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0); |
| 2768 | if (IS_ERR(em)) |
| 2769 | return PTR_ERR(em); |
| 2770 | |
| 2771 | if (em->block_start == EXTENT_MAP_HOLE) |
Filipe Manana | 81fdf63 | 2018-01-18 11:34:31 +0000 | [diff] [blame] | 2772 | ret = RANGE_BOUNDARY_HOLE; |
| 2773 | else if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
| 2774 | ret = RANGE_BOUNDARY_PREALLOC_EXTENT; |
| 2775 | else |
| 2776 | ret = RANGE_BOUNDARY_WRITTEN_EXTENT; |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2777 | |
| 2778 | free_extent_map(em); |
| 2779 | return ret; |
| 2780 | } |
| 2781 | |
| 2782 | static int btrfs_zero_range(struct inode *inode, |
| 2783 | loff_t offset, |
| 2784 | loff_t len, |
| 2785 | const int mode) |
| 2786 | { |
| 2787 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; |
| 2788 | struct extent_map *em; |
| 2789 | struct extent_changeset *data_reserved = NULL; |
| 2790 | int ret; |
| 2791 | u64 alloc_hint = 0; |
| 2792 | const u64 sectorsize = btrfs_inode_sectorsize(inode); |
| 2793 | u64 alloc_start = round_down(offset, sectorsize); |
| 2794 | u64 alloc_end = round_up(offset + len, sectorsize); |
| 2795 | u64 bytes_to_reserve = 0; |
| 2796 | bool space_reserved = false; |
| 2797 | |
| 2798 | inode_dio_wait(inode); |
| 2799 | |
| 2800 | em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, |
| 2801 | alloc_start, alloc_end - alloc_start, 0); |
| 2802 | if (IS_ERR(em)) { |
| 2803 | ret = PTR_ERR(em); |
| 2804 | goto out; |
| 2805 | } |
| 2806 | |
| 2807 | /* |
| 2808 | * Avoid hole punching and extent allocation for some cases. More cases |
| 2809 | * could be considered, but these are unlikely common and we keep things |
| 2810 | * as simple as possible for now. Also, intentionally, if the target |
| 2811 | * range contains one or more prealloc extents together with regular |
| 2812 | * extents and holes, we drop all the existing extents and allocate a |
| 2813 | * new prealloc extent, so that we get a larger contiguous disk extent. |
| 2814 | */ |
| 2815 | if (em->start <= alloc_start && |
| 2816 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
| 2817 | const u64 em_end = em->start + em->len; |
| 2818 | |
| 2819 | if (em_end >= offset + len) { |
| 2820 | /* |
| 2821 | * The whole range is already a prealloc extent, |
| 2822 | * do nothing except updating the inode's i_size if |
| 2823 | * needed. |
| 2824 | */ |
| 2825 | free_extent_map(em); |
| 2826 | ret = btrfs_fallocate_update_isize(inode, offset + len, |
| 2827 | mode); |
| 2828 | goto out; |
| 2829 | } |
| 2830 | /* |
| 2831 | * Part of the range is already a prealloc extent, so operate |
| 2832 | * only on the remaining part of the range. |
| 2833 | */ |
| 2834 | alloc_start = em_end; |
| 2835 | ASSERT(IS_ALIGNED(alloc_start, sectorsize)); |
| 2836 | len = offset + len - alloc_start; |
| 2837 | offset = alloc_start; |
| 2838 | alloc_hint = em->block_start + em->len; |
| 2839 | } |
| 2840 | free_extent_map(em); |
| 2841 | |
| 2842 | if (BTRFS_BYTES_TO_BLKS(fs_info, offset) == |
| 2843 | BTRFS_BYTES_TO_BLKS(fs_info, offset + len - 1)) { |
| 2844 | em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, |
| 2845 | alloc_start, sectorsize, 0); |
| 2846 | if (IS_ERR(em)) { |
| 2847 | ret = PTR_ERR(em); |
| 2848 | goto out; |
| 2849 | } |
| 2850 | |
| 2851 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
| 2852 | free_extent_map(em); |
| 2853 | ret = btrfs_fallocate_update_isize(inode, offset + len, |
| 2854 | mode); |
| 2855 | goto out; |
| 2856 | } |
| 2857 | if (len < sectorsize && em->block_start != EXTENT_MAP_HOLE) { |
| 2858 | free_extent_map(em); |
| 2859 | ret = btrfs_truncate_block(inode, offset, len, 0); |
| 2860 | if (!ret) |
| 2861 | ret = btrfs_fallocate_update_isize(inode, |
| 2862 | offset + len, |
| 2863 | mode); |
| 2864 | return ret; |
| 2865 | } |
| 2866 | free_extent_map(em); |
| 2867 | alloc_start = round_down(offset, sectorsize); |
| 2868 | alloc_end = alloc_start + sectorsize; |
| 2869 | goto reserve_space; |
| 2870 | } |
| 2871 | |
| 2872 | alloc_start = round_up(offset, sectorsize); |
| 2873 | alloc_end = round_down(offset + len, sectorsize); |
| 2874 | |
| 2875 | /* |
| 2876 | * For unaligned ranges, check the pages at the boundaries, they might |
| 2877 | * map to an extent, in which case we need to partially zero them, or |
| 2878 | * they might map to a hole, in which case we need our allocation range |
| 2879 | * to cover them. |
| 2880 | */ |
| 2881 | if (!IS_ALIGNED(offset, sectorsize)) { |
| 2882 | ret = btrfs_zero_range_check_range_boundary(inode, offset); |
| 2883 | if (ret < 0) |
| 2884 | goto out; |
Filipe Manana | 81fdf63 | 2018-01-18 11:34:31 +0000 | [diff] [blame] | 2885 | if (ret == RANGE_BOUNDARY_HOLE) { |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2886 | alloc_start = round_down(offset, sectorsize); |
| 2887 | ret = 0; |
Filipe Manana | 81fdf63 | 2018-01-18 11:34:31 +0000 | [diff] [blame] | 2888 | } else if (ret == RANGE_BOUNDARY_WRITTEN_EXTENT) { |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2889 | ret = btrfs_truncate_block(inode, offset, 0, 0); |
| 2890 | if (ret) |
| 2891 | goto out; |
Filipe Manana | 81fdf63 | 2018-01-18 11:34:31 +0000 | [diff] [blame] | 2892 | } else { |
| 2893 | ret = 0; |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2894 | } |
| 2895 | } |
| 2896 | |
| 2897 | if (!IS_ALIGNED(offset + len, sectorsize)) { |
| 2898 | ret = btrfs_zero_range_check_range_boundary(inode, |
| 2899 | offset + len); |
| 2900 | if (ret < 0) |
| 2901 | goto out; |
Filipe Manana | 81fdf63 | 2018-01-18 11:34:31 +0000 | [diff] [blame] | 2902 | if (ret == RANGE_BOUNDARY_HOLE) { |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2903 | alloc_end = round_up(offset + len, sectorsize); |
| 2904 | ret = 0; |
Filipe Manana | 81fdf63 | 2018-01-18 11:34:31 +0000 | [diff] [blame] | 2905 | } else if (ret == RANGE_BOUNDARY_WRITTEN_EXTENT) { |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2906 | ret = btrfs_truncate_block(inode, offset + len, 0, 1); |
| 2907 | if (ret) |
| 2908 | goto out; |
Filipe Manana | 81fdf63 | 2018-01-18 11:34:31 +0000 | [diff] [blame] | 2909 | } else { |
| 2910 | ret = 0; |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2911 | } |
| 2912 | } |
| 2913 | |
| 2914 | reserve_space: |
| 2915 | if (alloc_start < alloc_end) { |
| 2916 | struct extent_state *cached_state = NULL; |
| 2917 | const u64 lockstart = alloc_start; |
| 2918 | const u64 lockend = alloc_end - 1; |
| 2919 | |
| 2920 | bytes_to_reserve = alloc_end - alloc_start; |
| 2921 | ret = btrfs_alloc_data_chunk_ondemand(BTRFS_I(inode), |
| 2922 | bytes_to_reserve); |
| 2923 | if (ret < 0) |
| 2924 | goto out; |
| 2925 | space_reserved = true; |
| 2926 | ret = btrfs_qgroup_reserve_data(inode, &data_reserved, |
| 2927 | alloc_start, bytes_to_reserve); |
| 2928 | if (ret) |
| 2929 | goto out; |
| 2930 | ret = btrfs_punch_hole_lock_range(inode, lockstart, lockend, |
| 2931 | &cached_state); |
| 2932 | if (ret) |
| 2933 | goto out; |
| 2934 | ret = btrfs_prealloc_file_range(inode, mode, alloc_start, |
| 2935 | alloc_end - alloc_start, |
| 2936 | i_blocksize(inode), |
| 2937 | offset + len, &alloc_hint); |
| 2938 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, |
| 2939 | lockend, &cached_state); |
| 2940 | /* btrfs_prealloc_file_range releases reserved space on error */ |
Filipe Manana | 9f13ce7 | 2018-01-18 11:34:20 +0000 | [diff] [blame] | 2941 | if (ret) { |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2942 | space_reserved = false; |
Filipe Manana | 9f13ce7 | 2018-01-18 11:34:20 +0000 | [diff] [blame] | 2943 | goto out; |
| 2944 | } |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2945 | } |
Filipe Manana | 9f13ce7 | 2018-01-18 11:34:20 +0000 | [diff] [blame] | 2946 | ret = btrfs_fallocate_update_isize(inode, offset + len, mode); |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2947 | out: |
| 2948 | if (ret && space_reserved) |
| 2949 | btrfs_free_reserved_data_space(inode, data_reserved, |
| 2950 | alloc_start, bytes_to_reserve); |
| 2951 | extent_changeset_free(data_reserved); |
| 2952 | |
| 2953 | return ret; |
| 2954 | } |
| 2955 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2956 | static long btrfs_fallocate(struct file *file, int mode, |
| 2957 | loff_t offset, loff_t len) |
| 2958 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2959 | struct inode *inode = file_inode(file); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2960 | struct extent_state *cached_state = NULL; |
Qu Wenruo | 364ecf3 | 2017-02-27 15:10:38 +0800 | [diff] [blame] | 2961 | struct extent_changeset *data_reserved = NULL; |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 2962 | struct falloc_range *range; |
| 2963 | struct falloc_range *tmp; |
| 2964 | struct list_head reserve_list; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2965 | u64 cur_offset; |
| 2966 | u64 last_byte; |
| 2967 | u64 alloc_start; |
| 2968 | u64 alloc_end; |
| 2969 | u64 alloc_hint = 0; |
| 2970 | u64 locked_end; |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 2971 | u64 actual_end = 0; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2972 | struct extent_map *em; |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 2973 | int blocksize = btrfs_inode_sectorsize(inode); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2974 | int ret; |
| 2975 | |
Miao Xie | 797f427 | 2012-11-28 10:28:07 +0000 | [diff] [blame] | 2976 | alloc_start = round_down(offset, blocksize); |
| 2977 | alloc_end = round_up(offset + len, blocksize); |
Wang Xiaoguang | 1851309 | 2016-07-25 15:51:40 +0800 | [diff] [blame] | 2978 | cur_offset = alloc_start; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2979 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2980 | /* Make sure we aren't being give some crap mode */ |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2981 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | |
| 2982 | FALLOC_FL_ZERO_RANGE)) |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2983 | return -EOPNOTSUPP; |
| 2984 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2985 | if (mode & FALLOC_FL_PUNCH_HOLE) |
| 2986 | return btrfs_punch_hole(inode, offset, len); |
| 2987 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2988 | /* |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 2989 | * Only trigger disk allocation, don't trigger qgroup reserve |
| 2990 | * |
| 2991 | * For qgroup space, it will be checked later. |
Chris Mason | d98456f | 2012-01-31 20:27:41 -0500 | [diff] [blame] | 2992 | */ |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 2993 | if (!(mode & FALLOC_FL_ZERO_RANGE)) { |
| 2994 | ret = btrfs_alloc_data_chunk_ondemand(BTRFS_I(inode), |
| 2995 | alloc_end - alloc_start); |
| 2996 | if (ret < 0) |
| 2997 | return ret; |
| 2998 | } |
Chris Mason | d98456f | 2012-01-31 20:27:41 -0500 | [diff] [blame] | 2999 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 3000 | inode_lock(inode); |
Davide Italiano | 2a162ce | 2015-04-06 22:09:15 -0700 | [diff] [blame] | 3001 | |
| 3002 | if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) { |
| 3003 | ret = inode_newsize_ok(inode, offset + len); |
| 3004 | if (ret) |
| 3005 | goto out; |
| 3006 | } |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3007 | |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 3008 | /* |
| 3009 | * TODO: Move these two operations after we have checked |
| 3010 | * accurate reserved space, or fallocate can still fail but |
| 3011 | * with page truncated or size expanded. |
| 3012 | * |
| 3013 | * But that's a minor problem and won't do much harm BTW. |
| 3014 | */ |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3015 | if (alloc_start > inode->i_size) { |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3016 | ret = btrfs_cont_expand(inode, i_size_read(inode), |
| 3017 | alloc_start); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3018 | if (ret) |
| 3019 | goto out; |
Qu Wenruo | 0f6925f | 2015-10-14 15:26:13 +0800 | [diff] [blame] | 3020 | } else if (offset + len > inode->i_size) { |
Josef Bacik | a71754f | 2013-06-17 17:14:39 -0400 | [diff] [blame] | 3021 | /* |
| 3022 | * If we are fallocating from the end of the file onward we |
Chandan Rajendra | 9703fef | 2016-01-21 15:55:56 +0530 | [diff] [blame] | 3023 | * need to zero out the end of the block if i_size lands in the |
| 3024 | * middle of a block. |
Josef Bacik | a71754f | 2013-06-17 17:14:39 -0400 | [diff] [blame] | 3025 | */ |
Chandan Rajendra | 9703fef | 2016-01-21 15:55:56 +0530 | [diff] [blame] | 3026 | ret = btrfs_truncate_block(inode, inode->i_size, 0, 0); |
Josef Bacik | a71754f | 2013-06-17 17:14:39 -0400 | [diff] [blame] | 3027 | if (ret) |
| 3028 | goto out; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3029 | } |
| 3030 | |
Josef Bacik | a71754f | 2013-06-17 17:14:39 -0400 | [diff] [blame] | 3031 | /* |
| 3032 | * wait for ordered IO before we have any locks. We'll loop again |
| 3033 | * below with the locks held. |
| 3034 | */ |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 3035 | ret = btrfs_wait_ordered_range(inode, alloc_start, |
| 3036 | alloc_end - alloc_start); |
| 3037 | if (ret) |
| 3038 | goto out; |
Josef Bacik | a71754f | 2013-06-17 17:14:39 -0400 | [diff] [blame] | 3039 | |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 3040 | if (mode & FALLOC_FL_ZERO_RANGE) { |
| 3041 | ret = btrfs_zero_range(inode, offset, len, mode); |
| 3042 | inode_unlock(inode); |
| 3043 | return ret; |
| 3044 | } |
| 3045 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3046 | locked_end = alloc_end - 1; |
| 3047 | while (1) { |
| 3048 | struct btrfs_ordered_extent *ordered; |
| 3049 | |
| 3050 | /* the extent lock is ordered inside the running |
| 3051 | * transaction |
| 3052 | */ |
| 3053 | lock_extent_bits(&BTRFS_I(inode)->io_tree, alloc_start, |
David Sterba | ff13db4 | 2015-12-03 14:30:40 +0100 | [diff] [blame] | 3054 | locked_end, &cached_state); |
Nikolay Borisov | 96b09dd | 2017-11-01 11:36:05 +0200 | [diff] [blame] | 3055 | ordered = btrfs_lookup_first_ordered_extent(inode, locked_end); |
| 3056 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3057 | if (ordered && |
| 3058 | ordered->file_offset + ordered->len > alloc_start && |
| 3059 | ordered->file_offset < alloc_end) { |
| 3060 | btrfs_put_ordered_extent(ordered); |
| 3061 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
| 3062 | alloc_start, locked_end, |
David Sterba | e43bbe5 | 2017-12-12 21:43:52 +0100 | [diff] [blame] | 3063 | &cached_state); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3064 | /* |
| 3065 | * we can't wait on the range with the transaction |
| 3066 | * running or with the extent lock held |
| 3067 | */ |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 3068 | ret = btrfs_wait_ordered_range(inode, alloc_start, |
| 3069 | alloc_end - alloc_start); |
| 3070 | if (ret) |
| 3071 | goto out; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3072 | } else { |
| 3073 | if (ordered) |
| 3074 | btrfs_put_ordered_extent(ordered); |
| 3075 | break; |
| 3076 | } |
| 3077 | } |
| 3078 | |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 3079 | /* First, check if we exceed the qgroup limit */ |
| 3080 | INIT_LIST_HEAD(&reserve_list); |
Nikolay Borisov | 6b7d6e9 | 2017-11-01 11:32:18 +0200 | [diff] [blame] | 3081 | while (cur_offset < alloc_end) { |
Nikolay Borisov | fc4f21b | 2017-02-20 13:51:06 +0200 | [diff] [blame] | 3082 | em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, cur_offset, |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3083 | alloc_end - cur_offset, 0); |
Dan Carpenter | 9986277 | 2017-04-11 11:57:15 +0300 | [diff] [blame] | 3084 | if (IS_ERR(em)) { |
| 3085 | ret = PTR_ERR(em); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3086 | break; |
| 3087 | } |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3088 | last_byte = min(extent_map_end(em), alloc_end); |
Josef Bacik | f1e490a | 2011-08-18 10:36:39 -0400 | [diff] [blame] | 3089 | actual_end = min_t(u64, extent_map_end(em), offset + len); |
Miao Xie | 797f427 | 2012-11-28 10:28:07 +0000 | [diff] [blame] | 3090 | last_byte = ALIGN(last_byte, blocksize); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3091 | if (em->block_start == EXTENT_MAP_HOLE || |
| 3092 | (cur_offset >= inode->i_size && |
| 3093 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 3094 | ret = add_falloc_range(&reserve_list, cur_offset, |
| 3095 | last_byte - cur_offset); |
| 3096 | if (ret < 0) { |
| 3097 | free_extent_map(em); |
| 3098 | break; |
Filipe Manana | 3d850dd | 2015-03-12 23:23:13 +0000 | [diff] [blame] | 3099 | } |
Qu Wenruo | 364ecf3 | 2017-02-27 15:10:38 +0800 | [diff] [blame] | 3100 | ret = btrfs_qgroup_reserve_data(inode, &data_reserved, |
| 3101 | cur_offset, last_byte - cur_offset); |
Filipe Manana | be2d253 | 2017-04-03 15:57:17 +0100 | [diff] [blame] | 3102 | if (ret < 0) { |
| 3103 | free_extent_map(em); |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 3104 | break; |
Filipe Manana | be2d253 | 2017-04-03 15:57:17 +0100 | [diff] [blame] | 3105 | } |
Wang Xiaoguang | 1851309 | 2016-07-25 15:51:40 +0800 | [diff] [blame] | 3106 | } else { |
| 3107 | /* |
| 3108 | * Do not need to reserve unwritten extent for this |
| 3109 | * range, free reserved data space first, otherwise |
| 3110 | * it'll result in false ENOSPC error. |
| 3111 | */ |
Qu Wenruo | bc42bda | 2017-02-27 15:10:39 +0800 | [diff] [blame] | 3112 | btrfs_free_reserved_data_space(inode, data_reserved, |
| 3113 | cur_offset, last_byte - cur_offset); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3114 | } |
| 3115 | free_extent_map(em); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3116 | cur_offset = last_byte; |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 3117 | } |
| 3118 | |
| 3119 | /* |
| 3120 | * If ret is still 0, means we're OK to fallocate. |
| 3121 | * Or just cleanup the list and exit. |
| 3122 | */ |
| 3123 | list_for_each_entry_safe(range, tmp, &reserve_list, list) { |
| 3124 | if (!ret) |
| 3125 | ret = btrfs_prealloc_file_range(inode, mode, |
| 3126 | range->start, |
Fabian Frederick | 9340747 | 2017-02-27 14:28:32 -0800 | [diff] [blame] | 3127 | range->len, i_blocksize(inode), |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 3128 | offset + len, &alloc_hint); |
Wang Xiaoguang | 1851309 | 2016-07-25 15:51:40 +0800 | [diff] [blame] | 3129 | else |
Qu Wenruo | bc42bda | 2017-02-27 15:10:39 +0800 | [diff] [blame] | 3130 | btrfs_free_reserved_data_space(inode, |
| 3131 | data_reserved, range->start, |
| 3132 | range->len); |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 3133 | list_del(&range->list); |
| 3134 | kfree(range); |
| 3135 | } |
| 3136 | if (ret < 0) |
| 3137 | goto out_unlock; |
| 3138 | |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 3139 | /* |
| 3140 | * We didn't need to allocate any more space, but we still extended the |
| 3141 | * size of the file so we need to update i_size and the inode item. |
| 3142 | */ |
| 3143 | ret = btrfs_fallocate_update_isize(inode, actual_end, mode); |
Qu Wenruo | 14524a8 | 2015-09-08 17:22:44 +0800 | [diff] [blame] | 3144 | out_unlock: |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3145 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, alloc_start, locked_end, |
David Sterba | e43bbe5 | 2017-12-12 21:43:52 +0100 | [diff] [blame] | 3146 | &cached_state); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3147 | out: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 3148 | inode_unlock(inode); |
Chris Mason | d98456f | 2012-01-31 20:27:41 -0500 | [diff] [blame] | 3149 | /* Let go of our reservation. */ |
Filipe Manana | f27451f | 2017-10-25 11:55:28 +0100 | [diff] [blame] | 3150 | if (ret != 0 && !(mode & FALLOC_FL_ZERO_RANGE)) |
Qu Wenruo | bc42bda | 2017-02-27 15:10:39 +0800 | [diff] [blame] | 3151 | btrfs_free_reserved_data_space(inode, data_reserved, |
| 3152 | alloc_start, alloc_end - cur_offset); |
Qu Wenruo | 364ecf3 | 2017-02-27 15:10:38 +0800 | [diff] [blame] | 3153 | extent_changeset_free(data_reserved); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3154 | return ret; |
| 3155 | } |
| 3156 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 3157 | static int find_desired_extent(struct inode *inode, loff_t *offset, int whence) |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3158 | { |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 3159 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
Josef Bacik | 7f4ca37 | 2013-10-18 11:44:46 -0400 | [diff] [blame] | 3160 | struct extent_map *em = NULL; |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3161 | struct extent_state *cached_state = NULL; |
Liu Bo | 4d1a40c | 2014-09-16 17:49:30 +0800 | [diff] [blame] | 3162 | u64 lockstart; |
| 3163 | u64 lockend; |
| 3164 | u64 start; |
| 3165 | u64 len; |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3166 | int ret = 0; |
| 3167 | |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3168 | if (inode->i_size == 0) |
| 3169 | return -ENXIO; |
| 3170 | |
Liu Bo | 4d1a40c | 2014-09-16 17:49:30 +0800 | [diff] [blame] | 3171 | /* |
| 3172 | * *offset can be negative, in this case we start finding DATA/HOLE from |
| 3173 | * the very start of the file. |
| 3174 | */ |
| 3175 | start = max_t(loff_t, 0, *offset); |
| 3176 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 3177 | lockstart = round_down(start, fs_info->sectorsize); |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 3178 | lockend = round_up(i_size_read(inode), |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 3179 | fs_info->sectorsize); |
Liu Bo | 4d1a40c | 2014-09-16 17:49:30 +0800 | [diff] [blame] | 3180 | if (lockend <= lockstart) |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 3181 | lockend = lockstart + fs_info->sectorsize; |
Liu Bo | 4d1a40c | 2014-09-16 17:49:30 +0800 | [diff] [blame] | 3182 | lockend--; |
| 3183 | len = lockend - lockstart + 1; |
| 3184 | |
David Sterba | ff13db4 | 2015-12-03 14:30:40 +0100 | [diff] [blame] | 3185 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 3186 | &cached_state); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3187 | |
Josef Bacik | 7f4ca37 | 2013-10-18 11:44:46 -0400 | [diff] [blame] | 3188 | while (start < inode->i_size) { |
Nikolay Borisov | fc4f21b | 2017-02-20 13:51:06 +0200 | [diff] [blame] | 3189 | em = btrfs_get_extent_fiemap(BTRFS_I(inode), NULL, 0, |
| 3190 | start, len, 0); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3191 | if (IS_ERR(em)) { |
Jeff Liu | 6af021d | 2012-02-09 14:25:50 +0800 | [diff] [blame] | 3192 | ret = PTR_ERR(em); |
Josef Bacik | 7f4ca37 | 2013-10-18 11:44:46 -0400 | [diff] [blame] | 3193 | em = NULL; |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3194 | break; |
| 3195 | } |
| 3196 | |
Josef Bacik | 7f4ca37 | 2013-10-18 11:44:46 -0400 | [diff] [blame] | 3197 | if (whence == SEEK_HOLE && |
| 3198 | (em->block_start == EXTENT_MAP_HOLE || |
| 3199 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) |
| 3200 | break; |
| 3201 | else if (whence == SEEK_DATA && |
| 3202 | (em->block_start != EXTENT_MAP_HOLE && |
| 3203 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) |
| 3204 | break; |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3205 | |
| 3206 | start = em->start + em->len; |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3207 | free_extent_map(em); |
Josef Bacik | 7f4ca37 | 2013-10-18 11:44:46 -0400 | [diff] [blame] | 3208 | em = NULL; |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3209 | cond_resched(); |
| 3210 | } |
Josef Bacik | 7f4ca37 | 2013-10-18 11:44:46 -0400 | [diff] [blame] | 3211 | free_extent_map(em); |
| 3212 | if (!ret) { |
| 3213 | if (whence == SEEK_DATA && start >= inode->i_size) |
| 3214 | ret = -ENXIO; |
| 3215 | else |
| 3216 | *offset = min_t(loff_t, start, inode->i_size); |
| 3217 | } |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3218 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
David Sterba | e43bbe5 | 2017-12-12 21:43:52 +0100 | [diff] [blame] | 3219 | &cached_state); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3220 | return ret; |
| 3221 | } |
| 3222 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 3223 | static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int whence) |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3224 | { |
| 3225 | struct inode *inode = file->f_mapping->host; |
| 3226 | int ret; |
| 3227 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 3228 | inode_lock(inode); |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 3229 | switch (whence) { |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3230 | case SEEK_END: |
| 3231 | case SEEK_CUR: |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 3232 | offset = generic_file_llseek(file, offset, whence); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3233 | goto out; |
| 3234 | case SEEK_DATA: |
| 3235 | case SEEK_HOLE: |
Jeff Liu | 48802c8 | 2011-09-18 10:34:02 -0400 | [diff] [blame] | 3236 | if (offset >= i_size_read(inode)) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 3237 | inode_unlock(inode); |
Jeff Liu | 48802c8 | 2011-09-18 10:34:02 -0400 | [diff] [blame] | 3238 | return -ENXIO; |
| 3239 | } |
| 3240 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 3241 | ret = find_desired_extent(inode, &offset, whence); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3242 | if (ret) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 3243 | inode_unlock(inode); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3244 | return ret; |
| 3245 | } |
| 3246 | } |
| 3247 | |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 3248 | offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3249 | out: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 3250 | inode_unlock(inode); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3251 | return offset; |
| 3252 | } |
| 3253 | |
Goldwyn Rodrigues | edf064e | 2017-06-20 07:05:49 -0500 | [diff] [blame] | 3254 | static int btrfs_file_open(struct inode *inode, struct file *filp) |
| 3255 | { |
Christoph Hellwig | 91f9943 | 2017-08-29 16:13:20 +0200 | [diff] [blame] | 3256 | filp->f_mode |= FMODE_NOWAIT; |
Goldwyn Rodrigues | edf064e | 2017-06-20 07:05:49 -0500 | [diff] [blame] | 3257 | return generic_file_open(inode, filp); |
| 3258 | } |
| 3259 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 3260 | const struct file_operations btrfs_file_operations = { |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 3261 | .llseek = btrfs_file_llseek, |
Al Viro | aad4f8b | 2014-04-02 14:33:16 -0400 | [diff] [blame] | 3262 | .read_iter = generic_file_read_iter, |
Chris Mason | e9906a9 | 2007-12-14 12:56:58 -0500 | [diff] [blame] | 3263 | .splice_read = generic_file_splice_read, |
Al Viro | b30ac0f | 2014-04-03 14:29:04 -0400 | [diff] [blame] | 3264 | .write_iter = btrfs_file_write_iter, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 3265 | .mmap = btrfs_file_mmap, |
Goldwyn Rodrigues | edf064e | 2017-06-20 07:05:49 -0500 | [diff] [blame] | 3266 | .open = btrfs_file_open, |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 3267 | .release = btrfs_release_file, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3268 | .fsync = btrfs_sync_file, |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 3269 | .fallocate = btrfs_fallocate, |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 3270 | .unlocked_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3271 | #ifdef CONFIG_COMPAT |
Luke Dashjr | 4c63c24 | 2015-10-29 08:22:21 +0000 | [diff] [blame] | 3272 | .compat_ioctl = btrfs_compat_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3273 | #endif |
Christoph Hellwig | 04b38d6 | 2015-12-03 12:59:50 +0100 | [diff] [blame] | 3274 | .clone_file_range = btrfs_clone_file_range, |
Darrick J. Wong | 2b3909f | 2015-12-19 00:56:05 -0800 | [diff] [blame] | 3275 | .dedupe_file_range = btrfs_dedupe_file_range, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3276 | }; |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 3277 | |
David Sterba | e67c718 | 2018-02-19 17:24:18 +0100 | [diff] [blame] | 3278 | void __cold btrfs_auto_defrag_exit(void) |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 3279 | { |
Kinglong Mee | 5598e90 | 2016-01-29 21:36:35 +0800 | [diff] [blame] | 3280 | kmem_cache_destroy(btrfs_inode_defrag_cachep); |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 3281 | } |
| 3282 | |
Liu Bo | f5c29bd | 2017-11-02 17:21:50 -0600 | [diff] [blame] | 3283 | int __init btrfs_auto_defrag_init(void) |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 3284 | { |
| 3285 | btrfs_inode_defrag_cachep = kmem_cache_create("btrfs_inode_defrag", |
| 3286 | sizeof(struct inode_defrag), 0, |
Nikolay Borisov | fba4b69 | 2016-06-23 21:17:08 +0300 | [diff] [blame] | 3287 | SLAB_MEM_SPREAD, |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 3288 | NULL); |
| 3289 | if (!btrfs_inode_defrag_cachep) |
| 3290 | return -ENOMEM; |
| 3291 | |
| 3292 | return 0; |
| 3293 | } |
Filipe Manana | 728404d | 2014-10-10 09:43:11 +0100 | [diff] [blame] | 3294 | |
| 3295 | int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end) |
| 3296 | { |
| 3297 | int ret; |
| 3298 | |
| 3299 | /* |
| 3300 | * So with compression we will find and lock a dirty page and clear the |
| 3301 | * first one as dirty, setup an async extent, and immediately return |
| 3302 | * with the entire range locked but with nobody actually marked with |
| 3303 | * writeback. So we can't just filemap_write_and_wait_range() and |
| 3304 | * expect it to work since it will just kick off a thread to do the |
| 3305 | * actual work. So we need to call filemap_fdatawrite_range _again_ |
| 3306 | * since it will wait on the page lock, which won't be unlocked until |
| 3307 | * after the pages have been marked as writeback and so we're good to go |
| 3308 | * from there. We have to do this otherwise we'll miss the ordered |
| 3309 | * extents and that results in badness. Please Josef, do not think you |
| 3310 | * know better and pull this out at some point in the future, it is |
| 3311 | * right and you are wrong. |
| 3312 | */ |
| 3313 | ret = filemap_fdatawrite_range(inode->i_mapping, start, end); |
| 3314 | if (!ret && test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
| 3315 | &BTRFS_I(inode)->runtime_flags)) |
| 3316 | ret = filemap_fdatawrite_range(inode->i_mapping, start, end); |
| 3317 | |
| 3318 | return ret; |
| 3319 | } |