Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/bio.h> |
| 21 | #include <linux/buffer_head.h> |
| 22 | #include <linux/file.h> |
| 23 | #include <linux/fs.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 24 | #include <linux/fsnotify.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 25 | #include <linux/pagemap.h> |
| 26 | #include <linux/highmem.h> |
| 27 | #include <linux/time.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/string.h> |
| 30 | #include <linux/smp_lock.h> |
| 31 | #include <linux/backing-dev.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 32 | #include <linux/mount.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 33 | #include <linux/mpage.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 34 | #include <linux/namei.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 35 | #include <linux/swap.h> |
| 36 | #include <linux/writeback.h> |
| 37 | #include <linux/statfs.h> |
| 38 | #include <linux/compat.h> |
| 39 | #include <linux/bit_spinlock.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 40 | #include <linux/security.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 41 | #include <linux/version.h> |
| 42 | #include <linux/xattr.h> |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 43 | #include <linux/vmalloc.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 44 | #include "ctree.h" |
| 45 | #include "disk-io.h" |
| 46 | #include "transaction.h" |
| 47 | #include "btrfs_inode.h" |
| 48 | #include "ioctl.h" |
| 49 | #include "print-tree.h" |
| 50 | #include "volumes.h" |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 51 | #include "locking.h" |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 52 | |
| 53 | |
| 54 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 55 | static noinline int create_subvol(struct btrfs_root *root, |
| 56 | struct dentry *dentry, |
| 57 | char *name, int namelen) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 58 | { |
| 59 | struct btrfs_trans_handle *trans; |
| 60 | struct btrfs_key key; |
| 61 | struct btrfs_root_item root_item; |
| 62 | struct btrfs_inode_item *inode_item; |
| 63 | struct extent_buffer *leaf; |
| 64 | struct btrfs_root *new_root = root; |
| 65 | struct inode *dir; |
| 66 | int ret; |
| 67 | int err; |
| 68 | u64 objectid; |
| 69 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 70 | u64 index = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 71 | unsigned long nr = 1; |
| 72 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 73 | ret = btrfs_check_free_space(root, 1, 0); |
| 74 | if (ret) |
| 75 | goto fail_commit; |
| 76 | |
| 77 | trans = btrfs_start_transaction(root, 1); |
| 78 | BUG_ON(!trans); |
| 79 | |
| 80 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
| 81 | 0, &objectid); |
| 82 | if (ret) |
| 83 | goto fail; |
| 84 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 85 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, |
| 86 | objectid, trans->transid, 0, 0, 0); |
Josef Bacik | 8e8a1e3 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 87 | if (IS_ERR(leaf)) { |
| 88 | ret = PTR_ERR(leaf); |
| 89 | goto fail; |
| 90 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 91 | |
| 92 | btrfs_set_header_nritems(leaf, 0); |
| 93 | btrfs_set_header_level(leaf, 0); |
| 94 | btrfs_set_header_bytenr(leaf, leaf->start); |
| 95 | btrfs_set_header_generation(leaf, trans->transid); |
| 96 | btrfs_set_header_owner(leaf, objectid); |
| 97 | |
| 98 | write_extent_buffer(leaf, root->fs_info->fsid, |
| 99 | (unsigned long)btrfs_header_fsid(leaf), |
| 100 | BTRFS_FSID_SIZE); |
| 101 | btrfs_mark_buffer_dirty(leaf); |
| 102 | |
| 103 | inode_item = &root_item.inode; |
| 104 | memset(inode_item, 0, sizeof(*inode_item)); |
| 105 | inode_item->generation = cpu_to_le64(1); |
| 106 | inode_item->size = cpu_to_le64(3); |
| 107 | inode_item->nlink = cpu_to_le32(1); |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 108 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 109 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
| 110 | |
| 111 | btrfs_set_root_bytenr(&root_item, leaf->start); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 112 | btrfs_set_root_generation(&root_item, trans->transid); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 113 | btrfs_set_root_level(&root_item, 0); |
| 114 | btrfs_set_root_refs(&root_item, 1); |
| 115 | btrfs_set_root_used(&root_item, 0); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 116 | btrfs_set_root_last_snapshot(&root_item, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 117 | |
| 118 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
| 119 | root_item.drop_level = 0; |
| 120 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 121 | btrfs_tree_unlock(leaf); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 122 | free_extent_buffer(leaf); |
| 123 | leaf = NULL; |
| 124 | |
| 125 | btrfs_set_root_dirid(&root_item, new_dirid); |
| 126 | |
| 127 | key.objectid = objectid; |
| 128 | key.offset = 1; |
| 129 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
| 130 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
| 131 | &root_item); |
| 132 | if (ret) |
| 133 | goto fail; |
| 134 | |
| 135 | /* |
| 136 | * insert the directory item |
| 137 | */ |
| 138 | key.offset = (u64)-1; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 139 | dir = dentry->d_parent->d_inode; |
| 140 | ret = btrfs_set_inode_index(dir, &index); |
| 141 | BUG_ON(ret); |
| 142 | |
| 143 | ret = btrfs_insert_dir_item(trans, root, |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 144 | name, namelen, dir->i_ino, &key, |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 145 | BTRFS_FT_DIR, index); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 146 | if (ret) |
| 147 | goto fail; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame^] | 148 | |
| 149 | /* add the backref first */ |
| 150 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
| 151 | objectid, BTRFS_ROOT_BACKREF_KEY, |
| 152 | root->root_key.objectid, |
| 153 | dir->i_ino, index, name, namelen); |
| 154 | |
| 155 | BUG_ON(ret); |
| 156 | |
| 157 | /* now add the forward ref */ |
| 158 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
| 159 | root->root_key.objectid, BTRFS_ROOT_REF_KEY, |
| 160 | objectid, |
| 161 | dir->i_ino, index, name, namelen); |
| 162 | |
| 163 | BUG_ON(ret); |
| 164 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 165 | ret = btrfs_commit_transaction(trans, root); |
| 166 | if (ret) |
| 167 | goto fail_commit; |
| 168 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 169 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 170 | BUG_ON(!new_root); |
| 171 | |
| 172 | trans = btrfs_start_transaction(new_root, 1); |
| 173 | BUG_ON(!trans); |
| 174 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 175 | ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid, |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 176 | BTRFS_I(dir)->block_group); |
| 177 | if (ret) |
| 178 | goto fail; |
| 179 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 180 | fail: |
| 181 | nr = trans->blocks_used; |
| 182 | err = btrfs_commit_transaction(trans, new_root); |
| 183 | if (err && !ret) |
| 184 | ret = err; |
| 185 | fail_commit: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 186 | btrfs_btree_balance_dirty(root, nr); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 187 | return ret; |
| 188 | } |
| 189 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 190 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
| 191 | char *name, int namelen) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 192 | { |
| 193 | struct btrfs_pending_snapshot *pending_snapshot; |
| 194 | struct btrfs_trans_handle *trans; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 195 | int ret = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 196 | int err; |
| 197 | unsigned long nr = 0; |
| 198 | |
| 199 | if (!root->ref_cows) |
| 200 | return -EINVAL; |
| 201 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 202 | ret = btrfs_check_free_space(root, 1, 0); |
| 203 | if (ret) |
| 204 | goto fail_unlock; |
| 205 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 206 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 207 | if (!pending_snapshot) { |
| 208 | ret = -ENOMEM; |
| 209 | goto fail_unlock; |
| 210 | } |
| 211 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); |
| 212 | if (!pending_snapshot->name) { |
| 213 | ret = -ENOMEM; |
| 214 | kfree(pending_snapshot); |
| 215 | goto fail_unlock; |
| 216 | } |
| 217 | memcpy(pending_snapshot->name, name, namelen); |
| 218 | pending_snapshot->name[namelen] = '\0'; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 219 | pending_snapshot->dentry = dentry; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 220 | trans = btrfs_start_transaction(root, 1); |
| 221 | BUG_ON(!trans); |
| 222 | pending_snapshot->root = root; |
| 223 | list_add(&pending_snapshot->list, |
| 224 | &trans->transaction->pending_snapshots); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 225 | err = btrfs_commit_transaction(trans, root); |
| 226 | |
| 227 | fail_unlock: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 228 | btrfs_btree_balance_dirty(root, nr); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 229 | return ret; |
| 230 | } |
| 231 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 232 | /* copy of may_create in fs/namei.c() */ |
| 233 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) |
| 234 | { |
| 235 | if (child->d_inode) |
| 236 | return -EEXIST; |
| 237 | if (IS_DEADDIR(dir)) |
| 238 | return -ENOENT; |
| 239 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * Create a new subvolume below @parent. This is largely modeled after |
| 244 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup |
| 245 | * inside this filesystem so it's quite a bit simpler. |
| 246 | */ |
| 247 | static noinline int btrfs_mksubvol(struct path *parent, char *name, |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 248 | int mode, int namelen, |
| 249 | struct btrfs_root *snap_src) |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 250 | { |
| 251 | struct dentry *dentry; |
| 252 | int error; |
| 253 | |
| 254 | mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); |
| 255 | |
| 256 | dentry = lookup_one_len(name, parent->dentry, namelen); |
| 257 | error = PTR_ERR(dentry); |
| 258 | if (IS_ERR(dentry)) |
| 259 | goto out_unlock; |
| 260 | |
| 261 | error = -EEXIST; |
| 262 | if (dentry->d_inode) |
| 263 | goto out_dput; |
| 264 | |
| 265 | if (!IS_POSIXACL(parent->dentry->d_inode)) |
| 266 | mode &= ~current->fs->umask; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 267 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 268 | error = mnt_want_write(parent->mnt); |
| 269 | if (error) |
| 270 | goto out_dput; |
| 271 | |
| 272 | error = btrfs_may_create(parent->dentry->d_inode, dentry); |
| 273 | if (error) |
| 274 | goto out_drop_write; |
| 275 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 276 | /* |
| 277 | * Actually perform the low-level subvolume creation after all |
| 278 | * this VFS fuzz. |
| 279 | * |
| 280 | * Eventually we want to pass in an inode under which we create this |
| 281 | * subvolume, but for now all are under the filesystem root. |
| 282 | * |
| 283 | * Also we should pass on the mode eventually to allow creating new |
| 284 | * subvolume with specific mode bits. |
| 285 | */ |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 286 | if (snap_src) { |
| 287 | error = create_snapshot(snap_src, dentry, name, namelen); |
| 288 | } else { |
| 289 | error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, |
| 290 | dentry, name, namelen); |
| 291 | } |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 292 | if (error) |
| 293 | goto out_drop_write; |
| 294 | |
| 295 | fsnotify_mkdir(parent->dentry->d_inode, dentry); |
| 296 | out_drop_write: |
| 297 | mnt_drop_write(parent->mnt); |
| 298 | out_dput: |
| 299 | dput(dentry); |
| 300 | out_unlock: |
| 301 | mutex_unlock(&parent->dentry->d_inode->i_mutex); |
| 302 | return error; |
| 303 | } |
| 304 | |
| 305 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 306 | int btrfs_defrag_file(struct file *file) |
| 307 | { |
| 308 | struct inode *inode = fdentry(file)->d_inode; |
| 309 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 310 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 311 | struct btrfs_ordered_extent *ordered; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 312 | struct page *page; |
| 313 | unsigned long last_index; |
| 314 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; |
| 315 | unsigned long total_read = 0; |
| 316 | u64 page_start; |
| 317 | u64 page_end; |
| 318 | unsigned long i; |
| 319 | int ret; |
| 320 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 321 | ret = btrfs_check_free_space(root, inode->i_size, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 322 | if (ret) |
| 323 | return -ENOSPC; |
| 324 | |
| 325 | mutex_lock(&inode->i_mutex); |
| 326 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; |
| 327 | for (i = 0; i <= last_index; i++) { |
| 328 | if (total_read % ra_pages == 0) { |
| 329 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, |
| 330 | min(last_index, i + ra_pages - 1)); |
| 331 | } |
| 332 | total_read++; |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 333 | again: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 334 | page = grab_cache_page(inode->i_mapping, i); |
| 335 | if (!page) |
| 336 | goto out_unlock; |
| 337 | if (!PageUptodate(page)) { |
| 338 | btrfs_readpage(NULL, page); |
| 339 | lock_page(page); |
| 340 | if (!PageUptodate(page)) { |
| 341 | unlock_page(page); |
| 342 | page_cache_release(page); |
| 343 | goto out_unlock; |
| 344 | } |
| 345 | } |
| 346 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 347 | wait_on_page_writeback(page); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 348 | |
| 349 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
| 350 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 351 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 352 | |
| 353 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 354 | if (ordered) { |
| 355 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| 356 | unlock_page(page); |
| 357 | page_cache_release(page); |
| 358 | btrfs_start_ordered_extent(inode, ordered, 1); |
| 359 | btrfs_put_ordered_extent(ordered); |
| 360 | goto again; |
| 361 | } |
| 362 | set_page_extent_mapped(page); |
| 363 | |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 364 | /* |
| 365 | * this makes sure page_mkwrite is called on the |
| 366 | * page if it is dirtied again later |
| 367 | */ |
| 368 | clear_page_dirty_for_io(page); |
| 369 | |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 370 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 371 | |
| 372 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| 373 | set_page_dirty(page); |
| 374 | unlock_page(page); |
| 375 | page_cache_release(page); |
| 376 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); |
| 377 | } |
| 378 | |
| 379 | out_unlock: |
| 380 | mutex_unlock(&inode->i_mutex); |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * Called inside transaction, so use GFP_NOFS |
| 386 | */ |
| 387 | |
| 388 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
| 389 | { |
| 390 | u64 new_size; |
| 391 | u64 old_size; |
| 392 | u64 devid = 1; |
| 393 | struct btrfs_ioctl_vol_args *vol_args; |
| 394 | struct btrfs_trans_handle *trans; |
| 395 | struct btrfs_device *device = NULL; |
| 396 | char *sizestr; |
| 397 | char *devstr = NULL; |
| 398 | int ret = 0; |
| 399 | int namelen; |
| 400 | int mod = 0; |
| 401 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 402 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
| 403 | return -EROFS; |
| 404 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 405 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
| 406 | |
| 407 | if (!vol_args) |
| 408 | return -ENOMEM; |
| 409 | |
| 410 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { |
| 411 | ret = -EFAULT; |
| 412 | goto out; |
| 413 | } |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 414 | |
| 415 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 416 | namelen = strlen(vol_args->name); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 417 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 418 | mutex_lock(&root->fs_info->volume_mutex); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 419 | sizestr = vol_args->name; |
| 420 | devstr = strchr(sizestr, ':'); |
| 421 | if (devstr) { |
| 422 | char *end; |
| 423 | sizestr = devstr + 1; |
| 424 | *devstr = '\0'; |
| 425 | devstr = vol_args->name; |
| 426 | devid = simple_strtoull(devstr, &end, 10); |
| 427 | printk(KERN_INFO "resizing devid %llu\n", devid); |
| 428 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 429 | device = btrfs_find_device(root, devid, NULL, NULL); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 430 | if (!device) { |
| 431 | printk(KERN_INFO "resizer unable to find device %llu\n", devid); |
| 432 | ret = -EINVAL; |
| 433 | goto out_unlock; |
| 434 | } |
| 435 | if (!strcmp(sizestr, "max")) |
| 436 | new_size = device->bdev->bd_inode->i_size; |
| 437 | else { |
| 438 | if (sizestr[0] == '-') { |
| 439 | mod = -1; |
| 440 | sizestr++; |
| 441 | } else if (sizestr[0] == '+') { |
| 442 | mod = 1; |
| 443 | sizestr++; |
| 444 | } |
| 445 | new_size = btrfs_parse_size(sizestr); |
| 446 | if (new_size == 0) { |
| 447 | ret = -EINVAL; |
| 448 | goto out_unlock; |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | old_size = device->total_bytes; |
| 453 | |
| 454 | if (mod < 0) { |
| 455 | if (new_size > old_size) { |
| 456 | ret = -EINVAL; |
| 457 | goto out_unlock; |
| 458 | } |
| 459 | new_size = old_size - new_size; |
| 460 | } else if (mod > 0) { |
| 461 | new_size = old_size + new_size; |
| 462 | } |
| 463 | |
| 464 | if (new_size < 256 * 1024 * 1024) { |
| 465 | ret = -EINVAL; |
| 466 | goto out_unlock; |
| 467 | } |
| 468 | if (new_size > device->bdev->bd_inode->i_size) { |
| 469 | ret = -EFBIG; |
| 470 | goto out_unlock; |
| 471 | } |
| 472 | |
| 473 | do_div(new_size, root->sectorsize); |
| 474 | new_size *= root->sectorsize; |
| 475 | |
| 476 | printk(KERN_INFO "new size for %s is %llu\n", |
| 477 | device->name, (unsigned long long)new_size); |
| 478 | |
| 479 | if (new_size > old_size) { |
| 480 | trans = btrfs_start_transaction(root, 1); |
| 481 | ret = btrfs_grow_device(trans, device, new_size); |
| 482 | btrfs_commit_transaction(trans, root); |
| 483 | } else { |
| 484 | ret = btrfs_shrink_device(device, new_size); |
| 485 | } |
| 486 | |
| 487 | out_unlock: |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 488 | mutex_unlock(&root->fs_info->volume_mutex); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 489 | out: |
| 490 | kfree(vol_args); |
| 491 | return ret; |
| 492 | } |
| 493 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 494 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 495 | void __user *arg, int subvol) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 496 | { |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 497 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 498 | struct btrfs_ioctl_vol_args *vol_args; |
| 499 | struct btrfs_dir_item *di; |
| 500 | struct btrfs_path *path; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 501 | struct file *src_file; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 502 | u64 root_dirid; |
| 503 | int namelen; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 504 | int ret = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 505 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 506 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
| 507 | return -EROFS; |
| 508 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 509 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
| 510 | |
| 511 | if (!vol_args) |
| 512 | return -ENOMEM; |
| 513 | |
| 514 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { |
| 515 | ret = -EFAULT; |
| 516 | goto out; |
| 517 | } |
| 518 | |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 519 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 520 | namelen = strlen(vol_args->name); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 521 | if (strchr(vol_args->name, '/')) { |
| 522 | ret = -EINVAL; |
| 523 | goto out; |
| 524 | } |
| 525 | |
| 526 | path = btrfs_alloc_path(); |
| 527 | if (!path) { |
| 528 | ret = -ENOMEM; |
| 529 | goto out; |
| 530 | } |
| 531 | |
| 532 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 533 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
| 534 | path, root_dirid, |
| 535 | vol_args->name, namelen, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 536 | btrfs_free_path(path); |
| 537 | |
| 538 | if (di && !IS_ERR(di)) { |
| 539 | ret = -EEXIST; |
| 540 | goto out; |
| 541 | } |
| 542 | |
| 543 | if (IS_ERR(di)) { |
| 544 | ret = PTR_ERR(di); |
| 545 | goto out; |
| 546 | } |
| 547 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 548 | if (subvol) { |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 549 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, |
| 550 | file->f_path.dentry->d_inode->i_mode, |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 551 | namelen, NULL); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 552 | } else { |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 553 | struct inode *src_inode; |
| 554 | src_file = fget(vol_args->fd); |
| 555 | if (!src_file) { |
| 556 | ret = -EINVAL; |
| 557 | goto out; |
| 558 | } |
| 559 | |
| 560 | src_inode = src_file->f_path.dentry->d_inode; |
| 561 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { |
| 562 | printk("btrfs: Snapshot src from another FS\n"); |
| 563 | ret = -EINVAL; |
| 564 | fput(src_file); |
| 565 | goto out; |
| 566 | } |
| 567 | ret = btrfs_mksubvol(&file->f_path, vol_args->name, |
| 568 | file->f_path.dentry->d_inode->i_mode, |
| 569 | namelen, BTRFS_I(src_inode)->root); |
| 570 | fput(src_file); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 571 | } |
| 572 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 573 | out: |
| 574 | kfree(vol_args); |
| 575 | return ret; |
| 576 | } |
| 577 | |
| 578 | static int btrfs_ioctl_defrag(struct file *file) |
| 579 | { |
| 580 | struct inode *inode = fdentry(file)->d_inode; |
| 581 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 582 | int ret; |
| 583 | |
| 584 | ret = mnt_want_write(file->f_path.mnt); |
| 585 | if (ret) |
| 586 | return ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 587 | |
| 588 | switch (inode->i_mode & S_IFMT) { |
| 589 | case S_IFDIR: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 590 | btrfs_defrag_root(root, 0); |
| 591 | btrfs_defrag_root(root->fs_info->extent_root, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 592 | break; |
| 593 | case S_IFREG: |
| 594 | btrfs_defrag_file(file); |
| 595 | break; |
| 596 | } |
| 597 | |
| 598 | return 0; |
| 599 | } |
| 600 | |
| 601 | long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
| 602 | { |
| 603 | struct btrfs_ioctl_vol_args *vol_args; |
| 604 | int ret; |
| 605 | |
| 606 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
| 607 | |
| 608 | if (!vol_args) |
| 609 | return -ENOMEM; |
| 610 | |
| 611 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { |
| 612 | ret = -EFAULT; |
| 613 | goto out; |
| 614 | } |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 615 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 616 | ret = btrfs_init_new_device(root, vol_args->name); |
| 617 | |
| 618 | out: |
| 619 | kfree(vol_args); |
| 620 | return ret; |
| 621 | } |
| 622 | |
| 623 | long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
| 624 | { |
| 625 | struct btrfs_ioctl_vol_args *vol_args; |
| 626 | int ret; |
| 627 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 628 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
| 629 | return -EROFS; |
| 630 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 631 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
| 632 | |
| 633 | if (!vol_args) |
| 634 | return -ENOMEM; |
| 635 | |
| 636 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { |
| 637 | ret = -EFAULT; |
| 638 | goto out; |
| 639 | } |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 640 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 641 | ret = btrfs_rm_device(root, vol_args->name); |
| 642 | |
| 643 | out: |
| 644 | kfree(vol_args); |
| 645 | return ret; |
| 646 | } |
| 647 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 648 | long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, |
| 649 | u64 olen, u64 destoff) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 650 | { |
| 651 | struct inode *inode = fdentry(file)->d_inode; |
| 652 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 653 | struct file *src_file; |
| 654 | struct inode *src; |
| 655 | struct btrfs_trans_handle *trans; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 656 | struct btrfs_path *path; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 657 | struct extent_buffer *leaf; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 658 | char *buf; |
| 659 | struct btrfs_key key; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 660 | u32 nritems; |
| 661 | int slot; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 662 | int ret; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 663 | u64 len = olen; |
| 664 | u64 bs = root->fs_info->sb->s_blocksize; |
| 665 | u64 hint_byte; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 666 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 667 | /* |
| 668 | * TODO: |
| 669 | * - split compressed inline extents. annoying: we need to |
| 670 | * decompress into destination's address_space (the file offset |
| 671 | * may change, so source mapping won't do), then recompress (or |
| 672 | * otherwise reinsert) a subrange. |
| 673 | * - allow ranges within the same file to be cloned (provided |
| 674 | * they don't overlap)? |
| 675 | */ |
| 676 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 677 | ret = mnt_want_write(file->f_path.mnt); |
| 678 | if (ret) |
| 679 | return ret; |
| 680 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 681 | src_file = fget(srcfd); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 682 | if (!src_file) |
| 683 | return -EBADF; |
| 684 | src = src_file->f_dentry->d_inode; |
| 685 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 686 | ret = -EINVAL; |
| 687 | if (src == inode) |
| 688 | goto out_fput; |
| 689 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 690 | ret = -EISDIR; |
| 691 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 692 | goto out_fput; |
| 693 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 694 | ret = -EXDEV; |
| 695 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
| 696 | goto out_fput; |
| 697 | |
| 698 | ret = -ENOMEM; |
| 699 | buf = vmalloc(btrfs_level_size(root, 0)); |
| 700 | if (!buf) |
| 701 | goto out_fput; |
| 702 | |
| 703 | path = btrfs_alloc_path(); |
| 704 | if (!path) { |
| 705 | vfree(buf); |
| 706 | goto out_fput; |
| 707 | } |
| 708 | path->reada = 2; |
| 709 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 710 | if (inode < src) { |
| 711 | mutex_lock(&inode->i_mutex); |
| 712 | mutex_lock(&src->i_mutex); |
| 713 | } else { |
| 714 | mutex_lock(&src->i_mutex); |
| 715 | mutex_lock(&inode->i_mutex); |
| 716 | } |
| 717 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 718 | /* determine range to clone */ |
| 719 | ret = -EINVAL; |
| 720 | if (off >= src->i_size || off + len > src->i_size) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 721 | goto out_unlock; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 722 | if (len == 0) |
| 723 | olen = len = src->i_size - off; |
| 724 | /* if we extend to eof, continue to block boundary */ |
| 725 | if (off + len == src->i_size) |
| 726 | len = ((src->i_size + bs-1) & ~(bs-1)) |
| 727 | - off; |
| 728 | |
| 729 | /* verify the end result is block aligned */ |
| 730 | if ((off & (bs-1)) || |
| 731 | ((off + len) & (bs-1))) |
| 732 | goto out_unlock; |
| 733 | |
| 734 | printk("final src extent is %llu~%llu\n", off, len); |
| 735 | printk("final dst extent is %llu~%llu\n", destoff, len); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 736 | |
| 737 | /* do any pending delalloc/csum calc on src, one way or |
| 738 | another, and lock file content */ |
| 739 | while (1) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 740 | struct btrfs_ordered_extent *ordered; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 741 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
| 742 | ordered = btrfs_lookup_first_ordered_extent(inode, off+len); |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 743 | if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 744 | break; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 745 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 746 | if (ordered) |
| 747 | btrfs_put_ordered_extent(ordered); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 748 | btrfs_wait_ordered_range(src, off, off+len); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 749 | } |
| 750 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 751 | trans = btrfs_start_transaction(root, 1); |
| 752 | BUG_ON(!trans); |
| 753 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 754 | /* punch hole in destination first */ |
| 755 | btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte); |
| 756 | |
| 757 | /* clone data */ |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 758 | key.objectid = src->i_ino; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 759 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 760 | key.offset = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 761 | |
| 762 | while (1) { |
| 763 | /* |
| 764 | * note the key will change type as we walk through the |
| 765 | * tree. |
| 766 | */ |
| 767 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); |
| 768 | if (ret < 0) |
| 769 | goto out; |
| 770 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 771 | nritems = btrfs_header_nritems(path->nodes[0]); |
| 772 | if (path->slots[0] >= nritems) { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 773 | ret = btrfs_next_leaf(root, path); |
| 774 | if (ret < 0) |
| 775 | goto out; |
| 776 | if (ret > 0) |
| 777 | break; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 778 | nritems = btrfs_header_nritems(path->nodes[0]); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 779 | } |
| 780 | leaf = path->nodes[0]; |
| 781 | slot = path->slots[0]; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 782 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 783 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 784 | if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || |
| 785 | key.objectid != src->i_ino) |
| 786 | break; |
| 787 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 788 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
| 789 | struct btrfs_file_extent_item *extent; |
| 790 | int type; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 791 | u32 size; |
| 792 | struct btrfs_key new_key; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 793 | u64 disko = 0, diskl = 0; |
| 794 | u64 datao = 0, datal = 0; |
| 795 | u8 comp; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 796 | |
| 797 | size = btrfs_item_size_nr(leaf, slot); |
| 798 | read_extent_buffer(leaf, buf, |
| 799 | btrfs_item_ptr_offset(leaf, slot), |
| 800 | size); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 801 | |
| 802 | extent = btrfs_item_ptr(leaf, slot, |
| 803 | struct btrfs_file_extent_item); |
| 804 | comp = btrfs_file_extent_compression(leaf, extent); |
| 805 | type = btrfs_file_extent_type(leaf, extent); |
| 806 | if (type == BTRFS_FILE_EXTENT_REG) { |
| 807 | disko = btrfs_file_extent_disk_bytenr(leaf, extent); |
| 808 | diskl = btrfs_file_extent_disk_num_bytes(leaf, extent); |
| 809 | datao = btrfs_file_extent_offset(leaf, extent); |
| 810 | datal = btrfs_file_extent_num_bytes(leaf, extent); |
| 811 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
| 812 | /* take upper bound, may be compressed */ |
| 813 | datal = btrfs_file_extent_ram_bytes(leaf, |
| 814 | extent); |
| 815 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 816 | btrfs_release_path(root, path); |
| 817 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 818 | if (key.offset + datal < off || |
| 819 | key.offset >= off+len) |
| 820 | goto next; |
| 821 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 822 | memcpy(&new_key, &key, sizeof(new_key)); |
| 823 | new_key.objectid = inode->i_ino; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 824 | new_key.offset = key.offset + destoff - off; |
| 825 | |
| 826 | if (type == BTRFS_FILE_EXTENT_REG) { |
| 827 | ret = btrfs_insert_empty_item(trans, root, path, |
| 828 | &new_key, size); |
| 829 | if (ret) |
| 830 | goto out; |
| 831 | |
| 832 | leaf = path->nodes[0]; |
| 833 | slot = path->slots[0]; |
| 834 | write_extent_buffer(leaf, buf, |
| 835 | btrfs_item_ptr_offset(leaf, slot), |
| 836 | size); |
| 837 | |
| 838 | extent = btrfs_item_ptr(leaf, slot, |
| 839 | struct btrfs_file_extent_item); |
| 840 | printk(" orig disk %llu~%llu data %llu~%llu\n", |
| 841 | disko, diskl, datao, datal); |
| 842 | |
| 843 | if (off > key.offset) { |
| 844 | datao += off - key.offset; |
| 845 | datal -= off - key.offset; |
| 846 | } |
| 847 | if (key.offset + datao + datal + key.offset > |
| 848 | off + len) |
| 849 | datal = off + len - key.offset - datao; |
| 850 | /* disko == 0 means it's a hole */ |
| 851 | if (!disko) |
| 852 | datao = 0; |
| 853 | printk(" final disk %llu~%llu data %llu~%llu\n", |
| 854 | disko, diskl, datao, datal); |
| 855 | |
| 856 | btrfs_set_file_extent_offset(leaf, extent, |
| 857 | datao); |
| 858 | btrfs_set_file_extent_num_bytes(leaf, extent, |
| 859 | datal); |
| 860 | if (disko) { |
| 861 | inode_add_bytes(inode, datal); |
| 862 | ret = btrfs_inc_extent_ref(trans, root, |
| 863 | disko, diskl, leaf->start, |
| 864 | root->root_key.objectid, |
| 865 | trans->transid, |
| 866 | inode->i_ino); |
| 867 | BUG_ON(ret); |
| 868 | } |
| 869 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
| 870 | u64 skip = 0; |
| 871 | u64 trim = 0; |
| 872 | if (off > key.offset) { |
| 873 | skip = off - key.offset; |
| 874 | new_key.offset += skip; |
| 875 | } |
| 876 | if (key.offset + datal > off+len) |
| 877 | trim = key.offset + datal - (off+len); |
| 878 | printk("len %lld skip %lld trim %lld\n", |
| 879 | datal, skip, trim); |
| 880 | if (comp && (skip || trim)) { |
| 881 | printk("btrfs clone_range can't split compressed inline extents yet\n"); |
| 882 | ret = -EINVAL; |
| 883 | goto out; |
| 884 | } |
| 885 | size -= skip + trim; |
| 886 | datal -= skip + trim; |
| 887 | ret = btrfs_insert_empty_item(trans, root, path, |
| 888 | &new_key, size); |
| 889 | if (ret) |
| 890 | goto out; |
| 891 | |
| 892 | if (skip) { |
| 893 | u32 start = btrfs_file_extent_calc_inline_size(0); |
| 894 | memmove(buf+start, buf+start+skip, |
| 895 | datal); |
| 896 | } |
| 897 | |
| 898 | leaf = path->nodes[0]; |
| 899 | slot = path->slots[0]; |
| 900 | write_extent_buffer(leaf, buf, |
| 901 | btrfs_item_ptr_offset(leaf, slot), |
| 902 | size); |
| 903 | inode_add_bytes(inode, datal); |
| 904 | } |
| 905 | |
| 906 | btrfs_mark_buffer_dirty(leaf); |
| 907 | } |
| 908 | |
| 909 | if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { |
| 910 | u32 size; |
| 911 | struct btrfs_key new_key; |
| 912 | u64 coverslen; |
| 913 | int coff, clen; |
| 914 | |
| 915 | size = btrfs_item_size_nr(leaf, slot); |
| 916 | coverslen = (size / BTRFS_CRC32_SIZE) << |
| 917 | root->fs_info->sb->s_blocksize_bits; |
| 918 | printk("csums for %llu~%llu\n", |
| 919 | key.offset, coverslen); |
| 920 | if (key.offset + coverslen < off || |
| 921 | key.offset >= off+len) |
| 922 | goto next; |
| 923 | |
| 924 | read_extent_buffer(leaf, buf, |
| 925 | btrfs_item_ptr_offset(leaf, slot), |
| 926 | size); |
| 927 | btrfs_release_path(root, path); |
| 928 | |
| 929 | coff = 0; |
| 930 | if (off > key.offset) |
| 931 | coff = ((off - key.offset) >> |
| 932 | root->fs_info->sb->s_blocksize_bits) * |
| 933 | BTRFS_CRC32_SIZE; |
| 934 | clen = size - coff; |
| 935 | if (key.offset + coverslen > off+len) |
| 936 | clen -= ((key.offset+coverslen-off-len) >> |
| 937 | root->fs_info->sb->s_blocksize_bits) * |
| 938 | BTRFS_CRC32_SIZE; |
| 939 | printk(" will dup %d~%d of %d\n", |
| 940 | coff, clen, size); |
| 941 | |
| 942 | memcpy(&new_key, &key, sizeof(new_key)); |
| 943 | new_key.objectid = inode->i_ino; |
| 944 | new_key.offset = key.offset + destoff - off; |
| 945 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 946 | ret = btrfs_insert_empty_item(trans, root, path, |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 947 | &new_key, clen); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 948 | if (ret) |
| 949 | goto out; |
| 950 | |
| 951 | leaf = path->nodes[0]; |
| 952 | slot = path->slots[0]; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 953 | write_extent_buffer(leaf, buf + coff, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 954 | btrfs_item_ptr_offset(leaf, slot), |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 955 | clen); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 956 | btrfs_mark_buffer_dirty(leaf); |
| 957 | } |
| 958 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 959 | next: |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 960 | btrfs_release_path(root, path); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 961 | key.offset++; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 962 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 963 | ret = 0; |
| 964 | out: |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 965 | btrfs_release_path(root, path); |
| 966 | if (ret == 0) { |
| 967 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 968 | if (destoff + olen > inode->i_size) |
| 969 | btrfs_i_size_write(inode, destoff + olen); |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 970 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
| 971 | ret = btrfs_update_inode(trans, root, inode); |
| 972 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 973 | btrfs_end_transaction(trans, root); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 974 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 975 | if (ret) |
| 976 | vmtruncate(inode, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 977 | out_unlock: |
| 978 | mutex_unlock(&src->i_mutex); |
| 979 | mutex_unlock(&inode->i_mutex); |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 980 | vfree(buf); |
| 981 | btrfs_free_path(path); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 982 | out_fput: |
| 983 | fput(src_file); |
| 984 | return ret; |
| 985 | } |
| 986 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 987 | long btrfs_ioctl_clone_range(struct file *file, unsigned long argptr) |
| 988 | { |
| 989 | struct btrfs_ioctl_clone_range_args args; |
| 990 | |
| 991 | if (copy_from_user(&args, (void *)argptr, sizeof(args))) |
| 992 | return -EFAULT; |
| 993 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, |
| 994 | args.src_length, args.dest_offset); |
| 995 | } |
| 996 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 997 | /* |
| 998 | * there are many ways the trans_start and trans_end ioctls can lead |
| 999 | * to deadlocks. They should only be used by applications that |
| 1000 | * basically own the machine, and have a very in depth understanding |
| 1001 | * of all the possible deadlocks and enospc problems. |
| 1002 | */ |
| 1003 | long btrfs_ioctl_trans_start(struct file *file) |
| 1004 | { |
| 1005 | struct inode *inode = fdentry(file)->d_inode; |
| 1006 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1007 | struct btrfs_trans_handle *trans; |
| 1008 | int ret = 0; |
| 1009 | |
Christoph Hellwig | df5b552 | 2008-06-11 21:53:58 -0400 | [diff] [blame] | 1010 | if (!capable(CAP_SYS_ADMIN)) |
| 1011 | return -EPERM; |
| 1012 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1013 | if (file->private_data) { |
| 1014 | ret = -EINPROGRESS; |
| 1015 | goto out; |
| 1016 | } |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 1017 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1018 | ret = mnt_want_write(file->f_path.mnt); |
| 1019 | if (ret) |
| 1020 | goto out; |
| 1021 | |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 1022 | mutex_lock(&root->fs_info->trans_mutex); |
| 1023 | root->fs_info->open_ioctl_trans++; |
| 1024 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1025 | |
| 1026 | trans = btrfs_start_ioctl_transaction(root, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1027 | if (trans) |
| 1028 | file->private_data = trans; |
| 1029 | else |
| 1030 | ret = -ENOMEM; |
| 1031 | /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ |
| 1032 | out: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1033 | return ret; |
| 1034 | } |
| 1035 | |
| 1036 | /* |
| 1037 | * there are many ways the trans_start and trans_end ioctls can lead |
| 1038 | * to deadlocks. They should only be used by applications that |
| 1039 | * basically own the machine, and have a very in depth understanding |
| 1040 | * of all the possible deadlocks and enospc problems. |
| 1041 | */ |
| 1042 | long btrfs_ioctl_trans_end(struct file *file) |
| 1043 | { |
| 1044 | struct inode *inode = fdentry(file)->d_inode; |
| 1045 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1046 | struct btrfs_trans_handle *trans; |
| 1047 | int ret = 0; |
| 1048 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1049 | trans = file->private_data; |
| 1050 | if (!trans) { |
| 1051 | ret = -EINVAL; |
| 1052 | goto out; |
| 1053 | } |
| 1054 | btrfs_end_transaction(trans, root); |
Christoph Hellwig | b214107 | 2008-09-05 16:43:31 -0400 | [diff] [blame] | 1055 | file->private_data = NULL; |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 1056 | |
| 1057 | mutex_lock(&root->fs_info->trans_mutex); |
| 1058 | root->fs_info->open_ioctl_trans--; |
| 1059 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1060 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1061 | out: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1062 | return ret; |
| 1063 | } |
| 1064 | |
| 1065 | long btrfs_ioctl(struct file *file, unsigned int |
| 1066 | cmd, unsigned long arg) |
| 1067 | { |
| 1068 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
| 1069 | |
| 1070 | switch (cmd) { |
| 1071 | case BTRFS_IOC_SNAP_CREATE: |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1072 | return btrfs_ioctl_snap_create(file, (void __user *)arg, 0); |
| 1073 | case BTRFS_IOC_SUBVOL_CREATE: |
| 1074 | return btrfs_ioctl_snap_create(file, (void __user *)arg, 1); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1075 | case BTRFS_IOC_DEFRAG: |
| 1076 | return btrfs_ioctl_defrag(file); |
| 1077 | case BTRFS_IOC_RESIZE: |
| 1078 | return btrfs_ioctl_resize(root, (void __user *)arg); |
| 1079 | case BTRFS_IOC_ADD_DEV: |
| 1080 | return btrfs_ioctl_add_dev(root, (void __user *)arg); |
| 1081 | case BTRFS_IOC_RM_DEV: |
| 1082 | return btrfs_ioctl_rm_dev(root, (void __user *)arg); |
| 1083 | case BTRFS_IOC_BALANCE: |
| 1084 | return btrfs_balance(root->fs_info->dev_root); |
| 1085 | case BTRFS_IOC_CLONE: |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1086 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
| 1087 | case BTRFS_IOC_CLONE_RANGE: |
| 1088 | return btrfs_ioctl_clone_range(file, arg); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1089 | case BTRFS_IOC_TRANS_START: |
| 1090 | return btrfs_ioctl_trans_start(file); |
| 1091 | case BTRFS_IOC_TRANS_END: |
| 1092 | return btrfs_ioctl_trans_end(file); |
| 1093 | case BTRFS_IOC_SYNC: |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1094 | btrfs_start_delalloc_inodes(root); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1095 | btrfs_sync_fs(file->f_dentry->d_sb, 1); |
| 1096 | return 0; |
| 1097 | } |
| 1098 | |
| 1099 | return -ENOTTY; |
| 1100 | } |