1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/smp_lock.h> 31f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 32cb8e7090SChristoph Hellwig #include <linux/mount.h> 33f46b5a66SChristoph Hellwig #include <linux/mpage.h> 34cb8e7090SChristoph Hellwig #include <linux/namei.h> 35f46b5a66SChristoph Hellwig #include <linux/swap.h> 36f46b5a66SChristoph Hellwig #include <linux/writeback.h> 37f46b5a66SChristoph Hellwig #include <linux/statfs.h> 38f46b5a66SChristoph Hellwig #include <linux/compat.h> 39f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 40cb8e7090SChristoph Hellwig #include <linux/security.h> 41f46b5a66SChristoph Hellwig #include <linux/version.h> 42f46b5a66SChristoph Hellwig #include <linux/xattr.h> 437ea394f1SYan Zheng #include <linux/vmalloc.h> 44f46b5a66SChristoph Hellwig #include "ctree.h" 45f46b5a66SChristoph Hellwig #include "disk-io.h" 46f46b5a66SChristoph Hellwig #include "transaction.h" 47f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 48f46b5a66SChristoph Hellwig #include "ioctl.h" 49f46b5a66SChristoph Hellwig #include "print-tree.h" 50f46b5a66SChristoph Hellwig #include "volumes.h" 51925baeddSChris Mason #include "locking.h" 52f46b5a66SChristoph Hellwig 53f46b5a66SChristoph Hellwig 54f46b5a66SChristoph Hellwig 55cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 56cb8e7090SChristoph Hellwig struct dentry *dentry, 57cb8e7090SChristoph Hellwig char *name, int namelen) 58f46b5a66SChristoph Hellwig { 59f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 60f46b5a66SChristoph Hellwig struct btrfs_key key; 61f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 62f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 63f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 64f46b5a66SChristoph Hellwig struct btrfs_root *new_root = root; 65f46b5a66SChristoph Hellwig struct inode *dir; 66f46b5a66SChristoph Hellwig int ret; 67f46b5a66SChristoph Hellwig int err; 68f46b5a66SChristoph Hellwig u64 objectid; 69f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 70f46b5a66SChristoph Hellwig unsigned long nr = 1; 71f46b5a66SChristoph Hellwig 72f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, 1, 0); 73f46b5a66SChristoph Hellwig if (ret) 74f46b5a66SChristoph Hellwig goto fail_commit; 75f46b5a66SChristoph Hellwig 76f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 77f46b5a66SChristoph Hellwig BUG_ON(!trans); 78f46b5a66SChristoph Hellwig 79f46b5a66SChristoph Hellwig ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, 80f46b5a66SChristoph Hellwig 0, &objectid); 81f46b5a66SChristoph Hellwig if (ret) 82f46b5a66SChristoph Hellwig goto fail; 83f46b5a66SChristoph Hellwig 8431840ae1SZheng Yan leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 8531840ae1SZheng Yan objectid, trans->transid, 0, 0, 0); 868e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 878e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 888e8a1e31SJosef Bacik goto fail; 898e8a1e31SJosef Bacik } 90f46b5a66SChristoph Hellwig 91f46b5a66SChristoph Hellwig btrfs_set_header_nritems(leaf, 0); 92f46b5a66SChristoph Hellwig btrfs_set_header_level(leaf, 0); 93f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 94f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 95f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 96f46b5a66SChristoph Hellwig 97f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 98f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 99f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 100f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 101f46b5a66SChristoph Hellwig 102f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 103f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 104f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 105f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 106f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 107a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 108f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 109f46b5a66SChristoph Hellwig 110f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 111f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 112f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 113f46b5a66SChristoph Hellwig btrfs_set_root_used(&root_item, 0); 114f46b5a66SChristoph Hellwig 115f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 116f46b5a66SChristoph Hellwig root_item.drop_level = 0; 117f46b5a66SChristoph Hellwig 118925baeddSChris Mason btrfs_tree_unlock(leaf); 119f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 120f46b5a66SChristoph Hellwig leaf = NULL; 121f46b5a66SChristoph Hellwig 122f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 123f46b5a66SChristoph Hellwig 124f46b5a66SChristoph Hellwig key.objectid = objectid; 125f46b5a66SChristoph Hellwig key.offset = 1; 126f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 127f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 128f46b5a66SChristoph Hellwig &root_item); 129f46b5a66SChristoph Hellwig if (ret) 130f46b5a66SChristoph Hellwig goto fail; 131f46b5a66SChristoph Hellwig 132f46b5a66SChristoph Hellwig /* 133f46b5a66SChristoph Hellwig * insert the directory item 134f46b5a66SChristoph Hellwig */ 135f46b5a66SChristoph Hellwig key.offset = (u64)-1; 136f46b5a66SChristoph Hellwig dir = root->fs_info->sb->s_root->d_inode; 137f46b5a66SChristoph Hellwig ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, 138f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 139aec7477bSJosef Bacik BTRFS_FT_DIR, 0); 140f46b5a66SChristoph Hellwig if (ret) 141f46b5a66SChristoph Hellwig goto fail; 142f46b5a66SChristoph Hellwig 143f46b5a66SChristoph Hellwig ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, 144f46b5a66SChristoph Hellwig name, namelen, objectid, 145aec7477bSJosef Bacik root->fs_info->sb->s_root->d_inode->i_ino, 0); 146f46b5a66SChristoph Hellwig if (ret) 147f46b5a66SChristoph Hellwig goto fail; 148f46b5a66SChristoph Hellwig 149f46b5a66SChristoph Hellwig ret = btrfs_commit_transaction(trans, root); 150f46b5a66SChristoph Hellwig if (ret) 151f46b5a66SChristoph Hellwig goto fail_commit; 152f46b5a66SChristoph Hellwig 153f46b5a66SChristoph Hellwig new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); 154f46b5a66SChristoph Hellwig BUG_ON(!new_root); 155f46b5a66SChristoph Hellwig 156f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(new_root, 1); 157f46b5a66SChristoph Hellwig BUG_ON(!trans); 158f46b5a66SChristoph Hellwig 159cb8e7090SChristoph Hellwig ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid, 160f46b5a66SChristoph Hellwig BTRFS_I(dir)->block_group); 161f46b5a66SChristoph Hellwig if (ret) 162f46b5a66SChristoph Hellwig goto fail; 163f46b5a66SChristoph Hellwig 164f46b5a66SChristoph Hellwig fail: 165f46b5a66SChristoph Hellwig nr = trans->blocks_used; 166f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, new_root); 167f46b5a66SChristoph Hellwig if (err && !ret) 168f46b5a66SChristoph Hellwig ret = err; 169f46b5a66SChristoph Hellwig fail_commit: 170f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 171f46b5a66SChristoph Hellwig return ret; 172f46b5a66SChristoph Hellwig } 173f46b5a66SChristoph Hellwig 174f46b5a66SChristoph Hellwig static int create_snapshot(struct btrfs_root *root, char *name, int namelen) 175f46b5a66SChristoph Hellwig { 176f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 177f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 178f46b5a66SChristoph Hellwig int ret; 179f46b5a66SChristoph Hellwig int err; 180f46b5a66SChristoph Hellwig unsigned long nr = 0; 181f46b5a66SChristoph Hellwig 182f46b5a66SChristoph Hellwig if (!root->ref_cows) 183f46b5a66SChristoph Hellwig return -EINVAL; 184f46b5a66SChristoph Hellwig 185f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, 1, 0); 186f46b5a66SChristoph Hellwig if (ret) 187f46b5a66SChristoph Hellwig goto fail_unlock; 188f46b5a66SChristoph Hellwig 189f46b5a66SChristoph Hellwig pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS); 190f46b5a66SChristoph Hellwig if (!pending_snapshot) { 191f46b5a66SChristoph Hellwig ret = -ENOMEM; 192f46b5a66SChristoph Hellwig goto fail_unlock; 193f46b5a66SChristoph Hellwig } 194f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 195f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 196f46b5a66SChristoph Hellwig ret = -ENOMEM; 197f46b5a66SChristoph Hellwig kfree(pending_snapshot); 198f46b5a66SChristoph Hellwig goto fail_unlock; 199f46b5a66SChristoph Hellwig } 200f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 201f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 202f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 203f46b5a66SChristoph Hellwig BUG_ON(!trans); 204f46b5a66SChristoph Hellwig pending_snapshot->root = root; 205f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 206f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 207f46b5a66SChristoph Hellwig ret = btrfs_update_inode(trans, root, root->inode); 208f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, root); 209f46b5a66SChristoph Hellwig 210f46b5a66SChristoph Hellwig fail_unlock: 211f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 212f46b5a66SChristoph Hellwig return ret; 213f46b5a66SChristoph Hellwig } 214f46b5a66SChristoph Hellwig 215cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 216cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 217cb8e7090SChristoph Hellwig { 218cb8e7090SChristoph Hellwig if (child->d_inode) 219cb8e7090SChristoph Hellwig return -EEXIST; 220cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 221cb8e7090SChristoph Hellwig return -ENOENT; 222cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 223cb8e7090SChristoph Hellwig } 224cb8e7090SChristoph Hellwig 225cb8e7090SChristoph Hellwig /* 226cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 227cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 228cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 229cb8e7090SChristoph Hellwig */ 230cb8e7090SChristoph Hellwig static noinline int btrfs_mksubvol(struct path *parent, char *name, 231cb8e7090SChristoph Hellwig int mode, int namelen) 232cb8e7090SChristoph Hellwig { 233cb8e7090SChristoph Hellwig struct dentry *dentry; 234cb8e7090SChristoph Hellwig int error; 235cb8e7090SChristoph Hellwig 236cb8e7090SChristoph Hellwig mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); 237cb8e7090SChristoph Hellwig 238cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 239cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 240cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 241cb8e7090SChristoph Hellwig goto out_unlock; 242cb8e7090SChristoph Hellwig 243cb8e7090SChristoph Hellwig error = -EEXIST; 244cb8e7090SChristoph Hellwig if (dentry->d_inode) 245cb8e7090SChristoph Hellwig goto out_dput; 246cb8e7090SChristoph Hellwig 247cb8e7090SChristoph Hellwig if (!IS_POSIXACL(parent->dentry->d_inode)) 248cb8e7090SChristoph Hellwig mode &= ~current->fs->umask; 249cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 250cb8e7090SChristoph Hellwig if (error) 251cb8e7090SChristoph Hellwig goto out_dput; 252cb8e7090SChristoph Hellwig 253cb8e7090SChristoph Hellwig error = btrfs_may_create(parent->dentry->d_inode, dentry); 254cb8e7090SChristoph Hellwig if (error) 255cb8e7090SChristoph Hellwig goto out_drop_write; 256cb8e7090SChristoph Hellwig 257cb8e7090SChristoph Hellwig mode &= (S_IRWXUGO|S_ISVTX); 258cb8e7090SChristoph Hellwig error = security_inode_mkdir(parent->dentry->d_inode, dentry, mode); 259cb8e7090SChristoph Hellwig if (error) 260cb8e7090SChristoph Hellwig goto out_drop_write; 261cb8e7090SChristoph Hellwig 262cb8e7090SChristoph Hellwig /* 263cb8e7090SChristoph Hellwig * Actually perform the low-level subvolume creation after all 264cb8e7090SChristoph Hellwig * this VFS fuzz. 265cb8e7090SChristoph Hellwig * 266cb8e7090SChristoph Hellwig * Eventually we want to pass in an inode under which we create this 267cb8e7090SChristoph Hellwig * subvolume, but for now all are under the filesystem root. 268cb8e7090SChristoph Hellwig * 269cb8e7090SChristoph Hellwig * Also we should pass on the mode eventually to allow creating new 270cb8e7090SChristoph Hellwig * subvolume with specific mode bits. 271cb8e7090SChristoph Hellwig */ 272cb8e7090SChristoph Hellwig error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, dentry, 273cb8e7090SChristoph Hellwig name, namelen); 274cb8e7090SChristoph Hellwig if (error) 275cb8e7090SChristoph Hellwig goto out_drop_write; 276cb8e7090SChristoph Hellwig 277cb8e7090SChristoph Hellwig fsnotify_mkdir(parent->dentry->d_inode, dentry); 278cb8e7090SChristoph Hellwig out_drop_write: 279cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 280cb8e7090SChristoph Hellwig out_dput: 281cb8e7090SChristoph Hellwig dput(dentry); 282cb8e7090SChristoph Hellwig out_unlock: 283cb8e7090SChristoph Hellwig mutex_unlock(&parent->dentry->d_inode->i_mutex); 284cb8e7090SChristoph Hellwig return error; 285cb8e7090SChristoph Hellwig } 286cb8e7090SChristoph Hellwig 287cb8e7090SChristoph Hellwig 288f46b5a66SChristoph Hellwig int btrfs_defrag_file(struct file *file) 289f46b5a66SChristoph Hellwig { 290f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 291f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 292f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 2933eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 294f46b5a66SChristoph Hellwig struct page *page; 295f46b5a66SChristoph Hellwig unsigned long last_index; 296f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 297f46b5a66SChristoph Hellwig unsigned long total_read = 0; 298f46b5a66SChristoph Hellwig u64 page_start; 299f46b5a66SChristoph Hellwig u64 page_end; 300f46b5a66SChristoph Hellwig unsigned long i; 301f46b5a66SChristoph Hellwig int ret; 302f46b5a66SChristoph Hellwig 303f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, inode->i_size, 0); 304f46b5a66SChristoph Hellwig if (ret) 305f46b5a66SChristoph Hellwig return -ENOSPC; 306f46b5a66SChristoph Hellwig 307f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 308f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 309f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 310f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 311f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 312f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 313f46b5a66SChristoph Hellwig } 314f46b5a66SChristoph Hellwig total_read++; 3153eaa2885SChris Mason again: 316f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 317f46b5a66SChristoph Hellwig if (!page) 318f46b5a66SChristoph Hellwig goto out_unlock; 319f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 320f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 321f46b5a66SChristoph Hellwig lock_page(page); 322f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 323f46b5a66SChristoph Hellwig unlock_page(page); 324f46b5a66SChristoph Hellwig page_cache_release(page); 325f46b5a66SChristoph Hellwig goto out_unlock; 326f46b5a66SChristoph Hellwig } 327f46b5a66SChristoph Hellwig } 328f46b5a66SChristoph Hellwig 329f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 330f46b5a66SChristoph Hellwig 331f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 332f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 333f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 3343eaa2885SChris Mason 3353eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 3363eaa2885SChris Mason if (ordered) { 3373eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 3383eaa2885SChris Mason unlock_page(page); 3393eaa2885SChris Mason page_cache_release(page); 3403eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 3413eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 3423eaa2885SChris Mason goto again; 3433eaa2885SChris Mason } 3443eaa2885SChris Mason set_page_extent_mapped(page); 3453eaa2885SChris Mason 346f87f057bSChris Mason /* 347f87f057bSChris Mason * this makes sure page_mkwrite is called on the 348f87f057bSChris Mason * page if it is dirtied again later 349f87f057bSChris Mason */ 350f87f057bSChris Mason clear_page_dirty_for_io(page); 351f87f057bSChris Mason 352ea8c2819SChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end); 353f46b5a66SChristoph Hellwig 354f46b5a66SChristoph Hellwig unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 355f46b5a66SChristoph Hellwig set_page_dirty(page); 356f46b5a66SChristoph Hellwig unlock_page(page); 357f46b5a66SChristoph Hellwig page_cache_release(page); 358f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 359f46b5a66SChristoph Hellwig } 360f46b5a66SChristoph Hellwig 361f46b5a66SChristoph Hellwig out_unlock: 362f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 363f46b5a66SChristoph Hellwig return 0; 364f46b5a66SChristoph Hellwig } 365f46b5a66SChristoph Hellwig 366f46b5a66SChristoph Hellwig /* 367f46b5a66SChristoph Hellwig * Called inside transaction, so use GFP_NOFS 368f46b5a66SChristoph Hellwig */ 369f46b5a66SChristoph Hellwig 370f46b5a66SChristoph Hellwig static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) 371f46b5a66SChristoph Hellwig { 372f46b5a66SChristoph Hellwig u64 new_size; 373f46b5a66SChristoph Hellwig u64 old_size; 374f46b5a66SChristoph Hellwig u64 devid = 1; 375f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 376f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 377f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 378f46b5a66SChristoph Hellwig char *sizestr; 379f46b5a66SChristoph Hellwig char *devstr = NULL; 380f46b5a66SChristoph Hellwig int ret = 0; 381f46b5a66SChristoph Hellwig int namelen; 382f46b5a66SChristoph Hellwig int mod = 0; 383f46b5a66SChristoph Hellwig 384f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 385f46b5a66SChristoph Hellwig 386f46b5a66SChristoph Hellwig if (!vol_args) 387f46b5a66SChristoph Hellwig return -ENOMEM; 388f46b5a66SChristoph Hellwig 389f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 390f46b5a66SChristoph Hellwig ret = -EFAULT; 391f46b5a66SChristoph Hellwig goto out; 392f46b5a66SChristoph Hellwig } 3935516e595SMark Fasheh 3945516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 395f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 396f46b5a66SChristoph Hellwig 3977d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 398f46b5a66SChristoph Hellwig sizestr = vol_args->name; 399f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 400f46b5a66SChristoph Hellwig if (devstr) { 401f46b5a66SChristoph Hellwig char *end; 402f46b5a66SChristoph Hellwig sizestr = devstr + 1; 403f46b5a66SChristoph Hellwig *devstr = '\0'; 404f46b5a66SChristoph Hellwig devstr = vol_args->name; 405f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 406f46b5a66SChristoph Hellwig printk(KERN_INFO "resizing devid %llu\n", devid); 407f46b5a66SChristoph Hellwig } 408f46b5a66SChristoph Hellwig device = btrfs_find_device(root, devid, NULL); 409f46b5a66SChristoph Hellwig if (!device) { 410f46b5a66SChristoph Hellwig printk(KERN_INFO "resizer unable to find device %llu\n", devid); 411f46b5a66SChristoph Hellwig ret = -EINVAL; 412f46b5a66SChristoph Hellwig goto out_unlock; 413f46b5a66SChristoph Hellwig } 414f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 415f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 416f46b5a66SChristoph Hellwig else { 417f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 418f46b5a66SChristoph Hellwig mod = -1; 419f46b5a66SChristoph Hellwig sizestr++; 420f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 421f46b5a66SChristoph Hellwig mod = 1; 422f46b5a66SChristoph Hellwig sizestr++; 423f46b5a66SChristoph Hellwig } 424f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 425f46b5a66SChristoph Hellwig if (new_size == 0) { 426f46b5a66SChristoph Hellwig ret = -EINVAL; 427f46b5a66SChristoph Hellwig goto out_unlock; 428f46b5a66SChristoph Hellwig } 429f46b5a66SChristoph Hellwig } 430f46b5a66SChristoph Hellwig 431f46b5a66SChristoph Hellwig old_size = device->total_bytes; 432f46b5a66SChristoph Hellwig 433f46b5a66SChristoph Hellwig if (mod < 0) { 434f46b5a66SChristoph Hellwig if (new_size > old_size) { 435f46b5a66SChristoph Hellwig ret = -EINVAL; 436f46b5a66SChristoph Hellwig goto out_unlock; 437f46b5a66SChristoph Hellwig } 438f46b5a66SChristoph Hellwig new_size = old_size - new_size; 439f46b5a66SChristoph Hellwig } else if (mod > 0) { 440f46b5a66SChristoph Hellwig new_size = old_size + new_size; 441f46b5a66SChristoph Hellwig } 442f46b5a66SChristoph Hellwig 443f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 444f46b5a66SChristoph Hellwig ret = -EINVAL; 445f46b5a66SChristoph Hellwig goto out_unlock; 446f46b5a66SChristoph Hellwig } 447f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 448f46b5a66SChristoph Hellwig ret = -EFBIG; 449f46b5a66SChristoph Hellwig goto out_unlock; 450f46b5a66SChristoph Hellwig } 451f46b5a66SChristoph Hellwig 452f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 453f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 454f46b5a66SChristoph Hellwig 455f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 456f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 457f46b5a66SChristoph Hellwig 458f46b5a66SChristoph Hellwig if (new_size > old_size) { 459f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 460f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 461f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 462f46b5a66SChristoph Hellwig } else { 463f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 464f46b5a66SChristoph Hellwig } 465f46b5a66SChristoph Hellwig 466f46b5a66SChristoph Hellwig out_unlock: 4677d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 468f46b5a66SChristoph Hellwig out: 469f46b5a66SChristoph Hellwig kfree(vol_args); 470f46b5a66SChristoph Hellwig return ret; 471f46b5a66SChristoph Hellwig } 472f46b5a66SChristoph Hellwig 473cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 474f46b5a66SChristoph Hellwig void __user *arg) 475f46b5a66SChristoph Hellwig { 476cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 477f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 478f46b5a66SChristoph Hellwig struct btrfs_dir_item *di; 479f46b5a66SChristoph Hellwig struct btrfs_path *path; 480f46b5a66SChristoph Hellwig u64 root_dirid; 481f46b5a66SChristoph Hellwig int namelen; 482f46b5a66SChristoph Hellwig int ret; 483f46b5a66SChristoph Hellwig 484f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 485f46b5a66SChristoph Hellwig 486f46b5a66SChristoph Hellwig if (!vol_args) 487f46b5a66SChristoph Hellwig return -ENOMEM; 488f46b5a66SChristoph Hellwig 489f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 490f46b5a66SChristoph Hellwig ret = -EFAULT; 491f46b5a66SChristoph Hellwig goto out; 492f46b5a66SChristoph Hellwig } 493f46b5a66SChristoph Hellwig 4945516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 495f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 496f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 497f46b5a66SChristoph Hellwig ret = -EINVAL; 498f46b5a66SChristoph Hellwig goto out; 499f46b5a66SChristoph Hellwig } 500f46b5a66SChristoph Hellwig 501f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 502f46b5a66SChristoph Hellwig if (!path) { 503f46b5a66SChristoph Hellwig ret = -ENOMEM; 504f46b5a66SChristoph Hellwig goto out; 505f46b5a66SChristoph Hellwig } 506f46b5a66SChristoph Hellwig 507f46b5a66SChristoph Hellwig root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, 508f46b5a66SChristoph Hellwig di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, 509f46b5a66SChristoph Hellwig path, root_dirid, 510f46b5a66SChristoph Hellwig vol_args->name, namelen, 0); 511f46b5a66SChristoph Hellwig btrfs_free_path(path); 512f46b5a66SChristoph Hellwig 513f46b5a66SChristoph Hellwig if (di && !IS_ERR(di)) { 514f46b5a66SChristoph Hellwig ret = -EEXIST; 515f46b5a66SChristoph Hellwig goto out; 516f46b5a66SChristoph Hellwig } 517f46b5a66SChristoph Hellwig 518f46b5a66SChristoph Hellwig if (IS_ERR(di)) { 519f46b5a66SChristoph Hellwig ret = PTR_ERR(di); 520f46b5a66SChristoph Hellwig goto out; 521f46b5a66SChristoph Hellwig } 522f46b5a66SChristoph Hellwig 523cb8e7090SChristoph Hellwig if (root == root->fs_info->tree_root) { 524cb8e7090SChristoph Hellwig ret = btrfs_mksubvol(&file->f_path, vol_args->name, 525cb8e7090SChristoph Hellwig file->f_path.dentry->d_inode->i_mode, 526cb8e7090SChristoph Hellwig namelen); 527cb8e7090SChristoph Hellwig } else { 528f46b5a66SChristoph Hellwig ret = create_snapshot(root, vol_args->name, namelen); 529cb8e7090SChristoph Hellwig } 530cb8e7090SChristoph Hellwig 531f46b5a66SChristoph Hellwig out: 532f46b5a66SChristoph Hellwig kfree(vol_args); 533f46b5a66SChristoph Hellwig return ret; 534f46b5a66SChristoph Hellwig } 535f46b5a66SChristoph Hellwig 536f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 537f46b5a66SChristoph Hellwig { 538f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 539f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 540f46b5a66SChristoph Hellwig 541f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 542f46b5a66SChristoph Hellwig case S_IFDIR: 543f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 544f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 545f46b5a66SChristoph Hellwig break; 546f46b5a66SChristoph Hellwig case S_IFREG: 547f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 548f46b5a66SChristoph Hellwig break; 549f46b5a66SChristoph Hellwig } 550f46b5a66SChristoph Hellwig 551f46b5a66SChristoph Hellwig return 0; 552f46b5a66SChristoph Hellwig } 553f46b5a66SChristoph Hellwig 554f46b5a66SChristoph Hellwig long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 555f46b5a66SChristoph Hellwig { 556f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 557f46b5a66SChristoph Hellwig int ret; 558f46b5a66SChristoph Hellwig 559f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 560f46b5a66SChristoph Hellwig 561f46b5a66SChristoph Hellwig if (!vol_args) 562f46b5a66SChristoph Hellwig return -ENOMEM; 563f46b5a66SChristoph Hellwig 564f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 565f46b5a66SChristoph Hellwig ret = -EFAULT; 566f46b5a66SChristoph Hellwig goto out; 567f46b5a66SChristoph Hellwig } 5685516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 569f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 570f46b5a66SChristoph Hellwig 571f46b5a66SChristoph Hellwig out: 572f46b5a66SChristoph Hellwig kfree(vol_args); 573f46b5a66SChristoph Hellwig return ret; 574f46b5a66SChristoph Hellwig } 575f46b5a66SChristoph Hellwig 576f46b5a66SChristoph Hellwig long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 577f46b5a66SChristoph Hellwig { 578f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 579f46b5a66SChristoph Hellwig int ret; 580f46b5a66SChristoph Hellwig 581f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 582f46b5a66SChristoph Hellwig 583f46b5a66SChristoph Hellwig if (!vol_args) 584f46b5a66SChristoph Hellwig return -ENOMEM; 585f46b5a66SChristoph Hellwig 586f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 587f46b5a66SChristoph Hellwig ret = -EFAULT; 588f46b5a66SChristoph Hellwig goto out; 589f46b5a66SChristoph Hellwig } 5905516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 591f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 592f46b5a66SChristoph Hellwig 593f46b5a66SChristoph Hellwig out: 594f46b5a66SChristoph Hellwig kfree(vol_args); 595f46b5a66SChristoph Hellwig return ret; 596f46b5a66SChristoph Hellwig } 597f46b5a66SChristoph Hellwig 598f46b5a66SChristoph Hellwig long btrfs_ioctl_clone(struct file *file, unsigned long src_fd) 599f46b5a66SChristoph Hellwig { 600f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 601f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 602f46b5a66SChristoph Hellwig struct file *src_file; 603f46b5a66SChristoph Hellwig struct inode *src; 604f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 605f46b5a66SChristoph Hellwig struct btrfs_path *path; 606f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 607ae01a0abSYan Zheng char *buf; 608ae01a0abSYan Zheng struct btrfs_key key; 609f46b5a66SChristoph Hellwig u32 nritems; 610f46b5a66SChristoph Hellwig int slot; 611ae01a0abSYan Zheng int ret; 612f46b5a66SChristoph Hellwig 613f46b5a66SChristoph Hellwig src_file = fget(src_fd); 614f46b5a66SChristoph Hellwig if (!src_file) 615f46b5a66SChristoph Hellwig return -EBADF; 616f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 617f46b5a66SChristoph Hellwig 618ae01a0abSYan Zheng ret = -EISDIR; 619ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 620f46b5a66SChristoph Hellwig goto out_fput; 621f46b5a66SChristoph Hellwig 622ae01a0abSYan Zheng ret = -EXDEV; 623ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 624ae01a0abSYan Zheng goto out_fput; 625ae01a0abSYan Zheng 626ae01a0abSYan Zheng ret = -ENOMEM; 627ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 628ae01a0abSYan Zheng if (!buf) 629ae01a0abSYan Zheng goto out_fput; 630ae01a0abSYan Zheng 631ae01a0abSYan Zheng path = btrfs_alloc_path(); 632ae01a0abSYan Zheng if (!path) { 633ae01a0abSYan Zheng vfree(buf); 634ae01a0abSYan Zheng goto out_fput; 635ae01a0abSYan Zheng } 636ae01a0abSYan Zheng path->reada = 2; 637ae01a0abSYan Zheng 638f46b5a66SChristoph Hellwig if (inode < src) { 639f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 640f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 641f46b5a66SChristoph Hellwig } else { 642f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 643f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 644f46b5a66SChristoph Hellwig } 645f46b5a66SChristoph Hellwig 646f46b5a66SChristoph Hellwig ret = -ENOTEMPTY; 647f46b5a66SChristoph Hellwig if (inode->i_size) 648f46b5a66SChristoph Hellwig goto out_unlock; 649f46b5a66SChristoph Hellwig 650f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 651f46b5a66SChristoph Hellwig another, and lock file content */ 652f46b5a66SChristoph Hellwig while (1) { 65331840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 654f46b5a66SChristoph Hellwig lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); 655ae01a0abSYan Zheng ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); 656ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 657f46b5a66SChristoph Hellwig break; 658f46b5a66SChristoph Hellwig unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); 659ae01a0abSYan Zheng if (ordered) 660ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 661ae01a0abSYan Zheng btrfs_wait_ordered_range(src, 0, (u64)-1); 662f46b5a66SChristoph Hellwig } 663f46b5a66SChristoph Hellwig 664ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 665ae01a0abSYan Zheng BUG_ON(!trans); 666ae01a0abSYan Zheng 667f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 668ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 669ae01a0abSYan Zheng key.offset = 0; 670f46b5a66SChristoph Hellwig 671f46b5a66SChristoph Hellwig while (1) { 672f46b5a66SChristoph Hellwig /* 673f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 674f46b5a66SChristoph Hellwig * tree. 675f46b5a66SChristoph Hellwig */ 676f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 677f46b5a66SChristoph Hellwig if (ret < 0) 678f46b5a66SChristoph Hellwig goto out; 679f46b5a66SChristoph Hellwig 680ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 681ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 682f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 683f46b5a66SChristoph Hellwig if (ret < 0) 684f46b5a66SChristoph Hellwig goto out; 685f46b5a66SChristoph Hellwig if (ret > 0) 686f46b5a66SChristoph Hellwig break; 687ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 688f46b5a66SChristoph Hellwig } 689f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 690f46b5a66SChristoph Hellwig slot = path->slots[0]; 691f46b5a66SChristoph Hellwig 692ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 693f46b5a66SChristoph Hellwig if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || 694f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 695f46b5a66SChristoph Hellwig break; 696f46b5a66SChristoph Hellwig 69731840ae1SZheng Yan if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY || 69831840ae1SZheng Yan btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { 69931840ae1SZheng Yan u32 size; 70031840ae1SZheng Yan struct btrfs_key new_key; 70131840ae1SZheng Yan 70231840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 70331840ae1SZheng Yan read_extent_buffer(leaf, buf, 70431840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 70531840ae1SZheng Yan size); 70631840ae1SZheng Yan btrfs_release_path(root, path); 70731840ae1SZheng Yan 70831840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 70931840ae1SZheng Yan new_key.objectid = inode->i_ino; 71031840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 71131840ae1SZheng Yan &new_key, size); 71231840ae1SZheng Yan if (ret) 71331840ae1SZheng Yan goto out; 71431840ae1SZheng Yan 71531840ae1SZheng Yan leaf = path->nodes[0]; 71631840ae1SZheng Yan slot = path->slots[0]; 71731840ae1SZheng Yan write_extent_buffer(leaf, buf, 71831840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 71931840ae1SZheng Yan size); 72031840ae1SZheng Yan btrfs_mark_buffer_dirty(leaf); 72131840ae1SZheng Yan } 72231840ae1SZheng Yan 723f46b5a66SChristoph Hellwig if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 724f46b5a66SChristoph Hellwig struct btrfs_file_extent_item *extent; 725f46b5a66SChristoph Hellwig int found_type; 726ae01a0abSYan Zheng 727f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 728f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 729f46b5a66SChristoph Hellwig found_type = btrfs_file_extent_type(leaf, extent); 730f46b5a66SChristoph Hellwig if (found_type == BTRFS_FILE_EXTENT_REG) { 731f46b5a66SChristoph Hellwig u64 ds = btrfs_file_extent_disk_bytenr(leaf, 732f46b5a66SChristoph Hellwig extent); 733f46b5a66SChristoph Hellwig u64 dl = btrfs_file_extent_disk_num_bytes(leaf, 734f46b5a66SChristoph Hellwig extent); 735f46b5a66SChristoph Hellwig /* ds == 0 means there's a hole */ 736f46b5a66SChristoph Hellwig if (ds != 0) { 737ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 73831840ae1SZheng Yan ds, dl, leaf->start, 739f46b5a66SChristoph Hellwig root->root_key.objectid, 740f46b5a66SChristoph Hellwig trans->transid, 7413bb1a1bcSYan Zheng inode->i_ino); 742ae01a0abSYan Zheng BUG_ON(ret); 743f46b5a66SChristoph Hellwig } 74431840ae1SZheng Yan } 74531840ae1SZheng Yan } 74631840ae1SZheng Yan btrfs_release_path(root, path); 747ae01a0abSYan Zheng key.offset++; 748ae01a0abSYan Zheng } 749f46b5a66SChristoph Hellwig ret = 0; 750f46b5a66SChristoph Hellwig out: 751ae01a0abSYan Zheng btrfs_release_path(root, path); 752ae01a0abSYan Zheng if (ret == 0) { 753ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 754a76a3cd4SYan Zheng inode_set_bytes(inode, inode_get_bytes(src)); 755ae01a0abSYan Zheng btrfs_i_size_write(inode, src->i_size); 756ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 757ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 758ae01a0abSYan Zheng } 759f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 760ae01a0abSYan Zheng unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); 761ae01a0abSYan Zheng if (ret) 762ae01a0abSYan Zheng vmtruncate(inode, 0); 763f46b5a66SChristoph Hellwig out_unlock: 764f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 765f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 766ae01a0abSYan Zheng vfree(buf); 767ae01a0abSYan Zheng btrfs_free_path(path); 768f46b5a66SChristoph Hellwig out_fput: 769f46b5a66SChristoph Hellwig fput(src_file); 770f46b5a66SChristoph Hellwig return ret; 771f46b5a66SChristoph Hellwig } 772f46b5a66SChristoph Hellwig 773f46b5a66SChristoph Hellwig /* 774f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 775f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 776f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 777f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 778f46b5a66SChristoph Hellwig */ 779f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_start(struct file *file) 780f46b5a66SChristoph Hellwig { 781f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 782f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 783f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 784f46b5a66SChristoph Hellwig int ret = 0; 785f46b5a66SChristoph Hellwig 786df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 787df5b5520SChristoph Hellwig return -EPERM; 788df5b5520SChristoph Hellwig 789f46b5a66SChristoph Hellwig if (file->private_data) { 790f46b5a66SChristoph Hellwig ret = -EINPROGRESS; 791f46b5a66SChristoph Hellwig goto out; 792f46b5a66SChristoph Hellwig } 7939ca9ee09SSage Weil 7949ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 7959ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 7969ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 7979ca9ee09SSage Weil 7989ca9ee09SSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 799f46b5a66SChristoph Hellwig if (trans) 800f46b5a66SChristoph Hellwig file->private_data = trans; 801f46b5a66SChristoph Hellwig else 802f46b5a66SChristoph Hellwig ret = -ENOMEM; 803f46b5a66SChristoph Hellwig /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ 804f46b5a66SChristoph Hellwig out: 805f46b5a66SChristoph Hellwig return ret; 806f46b5a66SChristoph Hellwig } 807f46b5a66SChristoph Hellwig 808f46b5a66SChristoph Hellwig /* 809f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 810f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 811f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 812f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 813f46b5a66SChristoph Hellwig */ 814f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 815f46b5a66SChristoph Hellwig { 816f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 817f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 818f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 819f46b5a66SChristoph Hellwig int ret = 0; 820f46b5a66SChristoph Hellwig 821f46b5a66SChristoph Hellwig trans = file->private_data; 822f46b5a66SChristoph Hellwig if (!trans) { 823f46b5a66SChristoph Hellwig ret = -EINVAL; 824f46b5a66SChristoph Hellwig goto out; 825f46b5a66SChristoph Hellwig } 826f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 827b214107eSChristoph Hellwig file->private_data = NULL; 8289ca9ee09SSage Weil 8299ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 8309ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 8319ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 8329ca9ee09SSage Weil 833f46b5a66SChristoph Hellwig out: 834f46b5a66SChristoph Hellwig return ret; 835f46b5a66SChristoph Hellwig } 836f46b5a66SChristoph Hellwig 837f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 838f46b5a66SChristoph Hellwig cmd, unsigned long arg) 839f46b5a66SChristoph Hellwig { 840f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 841f46b5a66SChristoph Hellwig 842f46b5a66SChristoph Hellwig switch (cmd) { 843f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 844cb8e7090SChristoph Hellwig return btrfs_ioctl_snap_create(file, (void __user *)arg); 845f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 846f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 847f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 848f46b5a66SChristoph Hellwig return btrfs_ioctl_resize(root, (void __user *)arg); 849f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 850f46b5a66SChristoph Hellwig return btrfs_ioctl_add_dev(root, (void __user *)arg); 851f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 852f46b5a66SChristoph Hellwig return btrfs_ioctl_rm_dev(root, (void __user *)arg); 853f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 854f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 855f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 856f46b5a66SChristoph Hellwig return btrfs_ioctl_clone(file, arg); 857f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 858f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 859f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 860f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 861f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 862ea8c2819SChris Mason btrfs_start_delalloc_inodes(root); 863f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 864f46b5a66SChristoph Hellwig return 0; 865f46b5a66SChristoph Hellwig } 866f46b5a66SChristoph Hellwig 867f46b5a66SChristoph Hellwig return -ENOTTY; 868f46b5a66SChristoph Hellwig } 869