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> 24f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 25f46b5a66SChristoph Hellwig #include <linux/highmem.h> 26f46b5a66SChristoph Hellwig #include <linux/time.h> 27f46b5a66SChristoph Hellwig #include <linux/init.h> 28f46b5a66SChristoph Hellwig #include <linux/string.h> 29f46b5a66SChristoph Hellwig #include <linux/smp_lock.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31f46b5a66SChristoph Hellwig #include <linux/mpage.h> 32f46b5a66SChristoph Hellwig #include <linux/swap.h> 33f46b5a66SChristoph Hellwig #include <linux/writeback.h> 34f46b5a66SChristoph Hellwig #include <linux/statfs.h> 35f46b5a66SChristoph Hellwig #include <linux/compat.h> 36f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 37f46b5a66SChristoph Hellwig #include <linux/version.h> 38f46b5a66SChristoph Hellwig #include <linux/xattr.h> 39f46b5a66SChristoph Hellwig #include "ctree.h" 40f46b5a66SChristoph Hellwig #include "disk-io.h" 41f46b5a66SChristoph Hellwig #include "transaction.h" 42f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 43f46b5a66SChristoph Hellwig #include "ioctl.h" 44f46b5a66SChristoph Hellwig #include "print-tree.h" 45f46b5a66SChristoph Hellwig #include "volumes.h" 46925baeddSChris Mason #include "locking.h" 47f46b5a66SChristoph Hellwig 48f46b5a66SChristoph Hellwig 49f46b5a66SChristoph Hellwig 50f46b5a66SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, char *name, 51f46b5a66SChristoph Hellwig int namelen) 52f46b5a66SChristoph Hellwig { 53f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 54f46b5a66SChristoph Hellwig struct btrfs_key key; 55f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 56f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 57f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 58f46b5a66SChristoph Hellwig struct btrfs_root *new_root = root; 59f46b5a66SChristoph Hellwig struct inode *dir; 60f46b5a66SChristoph Hellwig int ret; 61f46b5a66SChristoph Hellwig int err; 62f46b5a66SChristoph Hellwig u64 objectid; 63f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 64f46b5a66SChristoph Hellwig unsigned long nr = 1; 65f46b5a66SChristoph Hellwig 66f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, 1, 0); 67f46b5a66SChristoph Hellwig if (ret) 68f46b5a66SChristoph Hellwig goto fail_commit; 69f46b5a66SChristoph Hellwig 70f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 71f46b5a66SChristoph Hellwig BUG_ON(!trans); 72f46b5a66SChristoph Hellwig 73f46b5a66SChristoph Hellwig ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, 74f46b5a66SChristoph Hellwig 0, &objectid); 75f46b5a66SChristoph Hellwig if (ret) 76f46b5a66SChristoph Hellwig goto fail; 77f46b5a66SChristoph Hellwig 78925baeddSChris Mason leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 79f46b5a66SChristoph Hellwig objectid, trans->transid, 0, 0, 80f46b5a66SChristoph Hellwig 0, 0); 818e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 828e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 838e8a1e31SJosef Bacik goto fail; 848e8a1e31SJosef Bacik } 85f46b5a66SChristoph Hellwig 86f46b5a66SChristoph Hellwig btrfs_set_header_nritems(leaf, 0); 87f46b5a66SChristoph Hellwig btrfs_set_header_level(leaf, 0); 88f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 89f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 90f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 91f46b5a66SChristoph Hellwig 92f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 93f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 94f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 95f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 96f46b5a66SChristoph Hellwig 97f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 98f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 99f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 100f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 101f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 102f46b5a66SChristoph Hellwig inode_item->nblocks = cpu_to_le64(1); 103f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 104f46b5a66SChristoph Hellwig 105f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 106f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 107f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 108f46b5a66SChristoph Hellwig btrfs_set_root_used(&root_item, 0); 109f46b5a66SChristoph Hellwig 110f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 111f46b5a66SChristoph Hellwig root_item.drop_level = 0; 112f46b5a66SChristoph Hellwig 113925baeddSChris Mason btrfs_tree_unlock(leaf); 114f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 115f46b5a66SChristoph Hellwig leaf = NULL; 116f46b5a66SChristoph Hellwig 117f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 118f46b5a66SChristoph Hellwig 119f46b5a66SChristoph Hellwig key.objectid = objectid; 120f46b5a66SChristoph Hellwig key.offset = 1; 121f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 122f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 123f46b5a66SChristoph Hellwig &root_item); 124f46b5a66SChristoph Hellwig if (ret) 125f46b5a66SChristoph Hellwig goto fail; 126f46b5a66SChristoph Hellwig 127f46b5a66SChristoph Hellwig /* 128f46b5a66SChristoph Hellwig * insert the directory item 129f46b5a66SChristoph Hellwig */ 130f46b5a66SChristoph Hellwig key.offset = (u64)-1; 131f46b5a66SChristoph Hellwig dir = root->fs_info->sb->s_root->d_inode; 132f46b5a66SChristoph Hellwig ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, 133f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 134aec7477bSJosef Bacik BTRFS_FT_DIR, 0); 135f46b5a66SChristoph Hellwig if (ret) 136f46b5a66SChristoph Hellwig goto fail; 137f46b5a66SChristoph Hellwig 138f46b5a66SChristoph Hellwig ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, 139f46b5a66SChristoph Hellwig name, namelen, objectid, 140aec7477bSJosef Bacik root->fs_info->sb->s_root->d_inode->i_ino, 0); 141f46b5a66SChristoph Hellwig if (ret) 142f46b5a66SChristoph Hellwig goto fail; 143f46b5a66SChristoph Hellwig 144f46b5a66SChristoph Hellwig ret = btrfs_commit_transaction(trans, root); 145f46b5a66SChristoph Hellwig if (ret) 146f46b5a66SChristoph Hellwig goto fail_commit; 147f46b5a66SChristoph Hellwig 148f46b5a66SChristoph Hellwig new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); 149f46b5a66SChristoph Hellwig BUG_ON(!new_root); 150f46b5a66SChristoph Hellwig 151f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(new_root, 1); 152f46b5a66SChristoph Hellwig BUG_ON(!trans); 153f46b5a66SChristoph Hellwig 154f46b5a66SChristoph Hellwig ret = btrfs_create_subvol_root(new_root, trans, new_dirid, 155f46b5a66SChristoph Hellwig BTRFS_I(dir)->block_group); 156f46b5a66SChristoph Hellwig if (ret) 157f46b5a66SChristoph Hellwig goto fail; 158f46b5a66SChristoph Hellwig 159f46b5a66SChristoph Hellwig /* Invalidate existing dcache entry for new subvolume. */ 160f46b5a66SChristoph Hellwig btrfs_invalidate_dcache_root(root, name, namelen); 161f46b5a66SChristoph Hellwig 162f46b5a66SChristoph Hellwig fail: 163f46b5a66SChristoph Hellwig nr = trans->blocks_used; 164f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, new_root); 165f46b5a66SChristoph Hellwig if (err && !ret) 166f46b5a66SChristoph Hellwig ret = err; 167f46b5a66SChristoph Hellwig fail_commit: 168f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 169f46b5a66SChristoph Hellwig return ret; 170f46b5a66SChristoph Hellwig } 171f46b5a66SChristoph Hellwig 172f46b5a66SChristoph Hellwig static int create_snapshot(struct btrfs_root *root, char *name, int namelen) 173f46b5a66SChristoph Hellwig { 174f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 175f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 176f46b5a66SChristoph Hellwig int ret; 177f46b5a66SChristoph Hellwig int err; 178f46b5a66SChristoph Hellwig unsigned long nr = 0; 179f46b5a66SChristoph Hellwig 180f46b5a66SChristoph Hellwig if (!root->ref_cows) 181f46b5a66SChristoph Hellwig return -EINVAL; 182f46b5a66SChristoph Hellwig 183f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, 1, 0); 184f46b5a66SChristoph Hellwig if (ret) 185f46b5a66SChristoph Hellwig goto fail_unlock; 186f46b5a66SChristoph Hellwig 187f46b5a66SChristoph Hellwig pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS); 188f46b5a66SChristoph Hellwig if (!pending_snapshot) { 189f46b5a66SChristoph Hellwig ret = -ENOMEM; 190f46b5a66SChristoph Hellwig goto fail_unlock; 191f46b5a66SChristoph Hellwig } 192f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 193f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 194f46b5a66SChristoph Hellwig ret = -ENOMEM; 195f46b5a66SChristoph Hellwig kfree(pending_snapshot); 196f46b5a66SChristoph Hellwig goto fail_unlock; 197f46b5a66SChristoph Hellwig } 198f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 199f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 200f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 201f46b5a66SChristoph Hellwig BUG_ON(!trans); 202f46b5a66SChristoph Hellwig pending_snapshot->root = root; 203f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 204f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 205f46b5a66SChristoph Hellwig ret = btrfs_update_inode(trans, root, root->inode); 206f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, root); 207f46b5a66SChristoph Hellwig 208f46b5a66SChristoph Hellwig fail_unlock: 209f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 210f46b5a66SChristoph Hellwig return ret; 211f46b5a66SChristoph Hellwig } 212f46b5a66SChristoph Hellwig 213f46b5a66SChristoph Hellwig int btrfs_defrag_file(struct file *file) 214f46b5a66SChristoph Hellwig { 215f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 216f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 217f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 2183eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 219f46b5a66SChristoph Hellwig struct page *page; 220f46b5a66SChristoph Hellwig unsigned long last_index; 221f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 222f46b5a66SChristoph Hellwig unsigned long total_read = 0; 223f46b5a66SChristoph Hellwig u64 page_start; 224f46b5a66SChristoph Hellwig u64 page_end; 225f46b5a66SChristoph Hellwig unsigned long i; 226f46b5a66SChristoph Hellwig int ret; 227f46b5a66SChristoph Hellwig 228f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, inode->i_size, 0); 229f46b5a66SChristoph Hellwig if (ret) 230f46b5a66SChristoph Hellwig return -ENOSPC; 231f46b5a66SChristoph Hellwig 232f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 233f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 234f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 235f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 236f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 237f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 238f46b5a66SChristoph Hellwig } 239f46b5a66SChristoph Hellwig total_read++; 2403eaa2885SChris Mason again: 241f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 242f46b5a66SChristoph Hellwig if (!page) 243f46b5a66SChristoph Hellwig goto out_unlock; 244f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 245f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 246f46b5a66SChristoph Hellwig lock_page(page); 247f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 248f46b5a66SChristoph Hellwig unlock_page(page); 249f46b5a66SChristoph Hellwig page_cache_release(page); 250f46b5a66SChristoph Hellwig goto out_unlock; 251f46b5a66SChristoph Hellwig } 252f46b5a66SChristoph Hellwig } 253f46b5a66SChristoph Hellwig 254f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 255f46b5a66SChristoph Hellwig 256f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 257f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 258f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 2593eaa2885SChris Mason 2603eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 2613eaa2885SChris Mason if (ordered) { 2623eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 2633eaa2885SChris Mason unlock_page(page); 2643eaa2885SChris Mason page_cache_release(page); 2653eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 2663eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 2673eaa2885SChris Mason goto again; 2683eaa2885SChris Mason } 2693eaa2885SChris Mason set_page_extent_mapped(page); 2703eaa2885SChris Mason 271f46b5a66SChristoph Hellwig set_extent_delalloc(io_tree, page_start, 272f46b5a66SChristoph Hellwig page_end, GFP_NOFS); 273f46b5a66SChristoph Hellwig 274f46b5a66SChristoph Hellwig unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 275f46b5a66SChristoph Hellwig set_page_dirty(page); 276f46b5a66SChristoph Hellwig unlock_page(page); 277f46b5a66SChristoph Hellwig page_cache_release(page); 278f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 279f46b5a66SChristoph Hellwig } 280f46b5a66SChristoph Hellwig 281f46b5a66SChristoph Hellwig out_unlock: 282f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 283f46b5a66SChristoph Hellwig return 0; 284f46b5a66SChristoph Hellwig } 285f46b5a66SChristoph Hellwig 286f46b5a66SChristoph Hellwig /* 287f46b5a66SChristoph Hellwig * Called inside transaction, so use GFP_NOFS 288f46b5a66SChristoph Hellwig */ 289f46b5a66SChristoph Hellwig 290f46b5a66SChristoph Hellwig static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) 291f46b5a66SChristoph Hellwig { 292f46b5a66SChristoph Hellwig u64 new_size; 293f46b5a66SChristoph Hellwig u64 old_size; 294f46b5a66SChristoph Hellwig u64 devid = 1; 295f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 296f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 297f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 298f46b5a66SChristoph Hellwig char *sizestr; 299f46b5a66SChristoph Hellwig char *devstr = NULL; 300f46b5a66SChristoph Hellwig int ret = 0; 301f46b5a66SChristoph Hellwig int namelen; 302f46b5a66SChristoph Hellwig int mod = 0; 303f46b5a66SChristoph Hellwig 304f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 305f46b5a66SChristoph Hellwig 306f46b5a66SChristoph Hellwig if (!vol_args) 307f46b5a66SChristoph Hellwig return -ENOMEM; 308f46b5a66SChristoph Hellwig 309f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 310f46b5a66SChristoph Hellwig ret = -EFAULT; 311f46b5a66SChristoph Hellwig goto out; 312f46b5a66SChristoph Hellwig } 3135516e595SMark Fasheh 3145516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 315f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 316f46b5a66SChristoph Hellwig 3177d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 318f46b5a66SChristoph Hellwig sizestr = vol_args->name; 319f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 320f46b5a66SChristoph Hellwig if (devstr) { 321f46b5a66SChristoph Hellwig char *end; 322f46b5a66SChristoph Hellwig sizestr = devstr + 1; 323f46b5a66SChristoph Hellwig *devstr = '\0'; 324f46b5a66SChristoph Hellwig devstr = vol_args->name; 325f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 326f46b5a66SChristoph Hellwig printk(KERN_INFO "resizing devid %llu\n", devid); 327f46b5a66SChristoph Hellwig } 328f46b5a66SChristoph Hellwig device = btrfs_find_device(root, devid, NULL); 329f46b5a66SChristoph Hellwig if (!device) { 330f46b5a66SChristoph Hellwig printk(KERN_INFO "resizer unable to find device %llu\n", devid); 331f46b5a66SChristoph Hellwig ret = -EINVAL; 332f46b5a66SChristoph Hellwig goto out_unlock; 333f46b5a66SChristoph Hellwig } 334f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 335f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 336f46b5a66SChristoph Hellwig else { 337f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 338f46b5a66SChristoph Hellwig mod = -1; 339f46b5a66SChristoph Hellwig sizestr++; 340f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 341f46b5a66SChristoph Hellwig mod = 1; 342f46b5a66SChristoph Hellwig sizestr++; 343f46b5a66SChristoph Hellwig } 344f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 345f46b5a66SChristoph Hellwig if (new_size == 0) { 346f46b5a66SChristoph Hellwig ret = -EINVAL; 347f46b5a66SChristoph Hellwig goto out_unlock; 348f46b5a66SChristoph Hellwig } 349f46b5a66SChristoph Hellwig } 350f46b5a66SChristoph Hellwig 351f46b5a66SChristoph Hellwig old_size = device->total_bytes; 352f46b5a66SChristoph Hellwig 353f46b5a66SChristoph Hellwig if (mod < 0) { 354f46b5a66SChristoph Hellwig if (new_size > old_size) { 355f46b5a66SChristoph Hellwig ret = -EINVAL; 356f46b5a66SChristoph Hellwig goto out_unlock; 357f46b5a66SChristoph Hellwig } 358f46b5a66SChristoph Hellwig new_size = old_size - new_size; 359f46b5a66SChristoph Hellwig } else if (mod > 0) { 360f46b5a66SChristoph Hellwig new_size = old_size + new_size; 361f46b5a66SChristoph Hellwig } 362f46b5a66SChristoph Hellwig 363f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 364f46b5a66SChristoph Hellwig ret = -EINVAL; 365f46b5a66SChristoph Hellwig goto out_unlock; 366f46b5a66SChristoph Hellwig } 367f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 368f46b5a66SChristoph Hellwig ret = -EFBIG; 369f46b5a66SChristoph Hellwig goto out_unlock; 370f46b5a66SChristoph Hellwig } 371f46b5a66SChristoph Hellwig 372f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 373f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 374f46b5a66SChristoph Hellwig 375f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 376f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 377f46b5a66SChristoph Hellwig 378f46b5a66SChristoph Hellwig if (new_size > old_size) { 379f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 380f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 381f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 382f46b5a66SChristoph Hellwig } else { 383f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 384f46b5a66SChristoph Hellwig } 385f46b5a66SChristoph Hellwig 386f46b5a66SChristoph Hellwig out_unlock: 3877d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 388f46b5a66SChristoph Hellwig out: 389f46b5a66SChristoph Hellwig kfree(vol_args); 390f46b5a66SChristoph Hellwig return ret; 391f46b5a66SChristoph Hellwig } 392f46b5a66SChristoph Hellwig 393f46b5a66SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct btrfs_root *root, 394f46b5a66SChristoph Hellwig void __user *arg) 395f46b5a66SChristoph Hellwig { 396f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 397f46b5a66SChristoph Hellwig struct btrfs_dir_item *di; 398f46b5a66SChristoph Hellwig struct btrfs_path *path; 399f46b5a66SChristoph Hellwig u64 root_dirid; 400f46b5a66SChristoph Hellwig int namelen; 401f46b5a66SChristoph Hellwig int ret; 402f46b5a66SChristoph Hellwig 403f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 404f46b5a66SChristoph Hellwig 405f46b5a66SChristoph Hellwig if (!vol_args) 406f46b5a66SChristoph Hellwig return -ENOMEM; 407f46b5a66SChristoph Hellwig 408f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 409f46b5a66SChristoph Hellwig ret = -EFAULT; 410f46b5a66SChristoph Hellwig goto out; 411f46b5a66SChristoph Hellwig } 412f46b5a66SChristoph Hellwig 4135516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 414f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 415f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 416f46b5a66SChristoph Hellwig ret = -EINVAL; 417f46b5a66SChristoph Hellwig goto out; 418f46b5a66SChristoph Hellwig } 419f46b5a66SChristoph Hellwig 420f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 421f46b5a66SChristoph Hellwig if (!path) { 422f46b5a66SChristoph Hellwig ret = -ENOMEM; 423f46b5a66SChristoph Hellwig goto out; 424f46b5a66SChristoph Hellwig } 425f46b5a66SChristoph Hellwig 426f46b5a66SChristoph Hellwig root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, 427f46b5a66SChristoph Hellwig di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, 428f46b5a66SChristoph Hellwig path, root_dirid, 429f46b5a66SChristoph Hellwig vol_args->name, namelen, 0); 430f46b5a66SChristoph Hellwig btrfs_free_path(path); 431f46b5a66SChristoph Hellwig 432f46b5a66SChristoph Hellwig if (di && !IS_ERR(di)) { 433f46b5a66SChristoph Hellwig ret = -EEXIST; 434f46b5a66SChristoph Hellwig goto out; 435f46b5a66SChristoph Hellwig } 436f46b5a66SChristoph Hellwig 437f46b5a66SChristoph Hellwig if (IS_ERR(di)) { 438f46b5a66SChristoph Hellwig ret = PTR_ERR(di); 439f46b5a66SChristoph Hellwig goto out; 440f46b5a66SChristoph Hellwig } 441f46b5a66SChristoph Hellwig 442a2135011SChris Mason mutex_lock(&root->fs_info->drop_mutex); 443f46b5a66SChristoph Hellwig if (root == root->fs_info->tree_root) 444f46b5a66SChristoph Hellwig ret = create_subvol(root, vol_args->name, namelen); 445f46b5a66SChristoph Hellwig else 446f46b5a66SChristoph Hellwig ret = create_snapshot(root, vol_args->name, namelen); 447a2135011SChris Mason mutex_unlock(&root->fs_info->drop_mutex); 448f46b5a66SChristoph Hellwig out: 449f46b5a66SChristoph Hellwig kfree(vol_args); 450f46b5a66SChristoph Hellwig return ret; 451f46b5a66SChristoph Hellwig } 452f46b5a66SChristoph Hellwig 453f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 454f46b5a66SChristoph Hellwig { 455f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 456f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 457f46b5a66SChristoph Hellwig 458f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 459f46b5a66SChristoph Hellwig case S_IFDIR: 460f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 461f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 462f46b5a66SChristoph Hellwig break; 463f46b5a66SChristoph Hellwig case S_IFREG: 464f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 465f46b5a66SChristoph Hellwig break; 466f46b5a66SChristoph Hellwig } 467f46b5a66SChristoph Hellwig 468f46b5a66SChristoph Hellwig return 0; 469f46b5a66SChristoph Hellwig } 470f46b5a66SChristoph Hellwig 471f46b5a66SChristoph Hellwig long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 472f46b5a66SChristoph Hellwig { 473f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 474f46b5a66SChristoph Hellwig int ret; 475f46b5a66SChristoph Hellwig 476f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 477f46b5a66SChristoph Hellwig 478f46b5a66SChristoph Hellwig if (!vol_args) 479f46b5a66SChristoph Hellwig return -ENOMEM; 480f46b5a66SChristoph Hellwig 481f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 482f46b5a66SChristoph Hellwig ret = -EFAULT; 483f46b5a66SChristoph Hellwig goto out; 484f46b5a66SChristoph Hellwig } 4855516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 486f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 487f46b5a66SChristoph Hellwig 488f46b5a66SChristoph Hellwig out: 489f46b5a66SChristoph Hellwig kfree(vol_args); 490f46b5a66SChristoph Hellwig return ret; 491f46b5a66SChristoph Hellwig } 492f46b5a66SChristoph Hellwig 493f46b5a66SChristoph Hellwig long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 494f46b5a66SChristoph Hellwig { 495f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 496f46b5a66SChristoph Hellwig int ret; 497f46b5a66SChristoph Hellwig 498f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 499f46b5a66SChristoph Hellwig 500f46b5a66SChristoph Hellwig if (!vol_args) 501f46b5a66SChristoph Hellwig return -ENOMEM; 502f46b5a66SChristoph Hellwig 503f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 504f46b5a66SChristoph Hellwig ret = -EFAULT; 505f46b5a66SChristoph Hellwig goto out; 506f46b5a66SChristoph Hellwig } 5075516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 508f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 509f46b5a66SChristoph Hellwig 510f46b5a66SChristoph Hellwig out: 511f46b5a66SChristoph Hellwig kfree(vol_args); 512f46b5a66SChristoph Hellwig return ret; 513f46b5a66SChristoph Hellwig } 514f46b5a66SChristoph Hellwig 515f46b5a66SChristoph Hellwig int dup_item_to_inode(struct btrfs_trans_handle *trans, 516f46b5a66SChristoph Hellwig struct btrfs_root *root, 517f46b5a66SChristoph Hellwig struct btrfs_path *path, 518f46b5a66SChristoph Hellwig struct extent_buffer *leaf, 519f46b5a66SChristoph Hellwig int slot, 520f46b5a66SChristoph Hellwig struct btrfs_key *key, 521f46b5a66SChristoph Hellwig u64 destino) 522f46b5a66SChristoph Hellwig { 523f46b5a66SChristoph Hellwig char *dup; 524f46b5a66SChristoph Hellwig int len = btrfs_item_size_nr(leaf, slot); 525f46b5a66SChristoph Hellwig struct btrfs_key ckey = *key; 526f46b5a66SChristoph Hellwig int ret = 0; 527f46b5a66SChristoph Hellwig 528f46b5a66SChristoph Hellwig dup = kmalloc(len, GFP_NOFS); 529f46b5a66SChristoph Hellwig if (!dup) 530f46b5a66SChristoph Hellwig return -ENOMEM; 531f46b5a66SChristoph Hellwig 532f46b5a66SChristoph Hellwig read_extent_buffer(leaf, dup, btrfs_item_ptr_offset(leaf, slot), len); 533f46b5a66SChristoph Hellwig btrfs_release_path(root, path); 534f46b5a66SChristoph Hellwig 535f46b5a66SChristoph Hellwig ckey.objectid = destino; 536f46b5a66SChristoph Hellwig ret = btrfs_insert_item(trans, root, &ckey, dup, len); 537f46b5a66SChristoph Hellwig kfree(dup); 538f46b5a66SChristoph Hellwig return ret; 539f46b5a66SChristoph Hellwig } 540f46b5a66SChristoph Hellwig 541f46b5a66SChristoph Hellwig long btrfs_ioctl_clone(struct file *file, unsigned long src_fd) 542f46b5a66SChristoph Hellwig { 543f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 544f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 545f46b5a66SChristoph Hellwig struct file *src_file; 546f46b5a66SChristoph Hellwig struct inode *src; 547f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 548f46b5a66SChristoph Hellwig int ret; 549f46b5a66SChristoph Hellwig u64 pos; 550f46b5a66SChristoph Hellwig struct btrfs_path *path; 551f46b5a66SChristoph Hellwig struct btrfs_key key; 552f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 553f46b5a66SChristoph Hellwig u32 nritems; 554f46b5a66SChristoph Hellwig int slot; 555f46b5a66SChristoph Hellwig 556f46b5a66SChristoph Hellwig src_file = fget(src_fd); 557f46b5a66SChristoph Hellwig if (!src_file) 558f46b5a66SChristoph Hellwig return -EBADF; 559f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 560f46b5a66SChristoph Hellwig 561f46b5a66SChristoph Hellwig ret = -EXDEV; 562f46b5a66SChristoph Hellwig if (src->i_sb != inode->i_sb) 563f46b5a66SChristoph Hellwig goto out_fput; 564f46b5a66SChristoph Hellwig 565f46b5a66SChristoph Hellwig if (inode < src) { 566f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 567f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 568f46b5a66SChristoph Hellwig } else { 569f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 570f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 571f46b5a66SChristoph Hellwig } 572f46b5a66SChristoph Hellwig 573f46b5a66SChristoph Hellwig ret = -ENOTEMPTY; 574f46b5a66SChristoph Hellwig if (inode->i_size) 575f46b5a66SChristoph Hellwig goto out_unlock; 576f46b5a66SChristoph Hellwig 577f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 578f46b5a66SChristoph Hellwig another, and lock file content */ 579f46b5a66SChristoph Hellwig while (1) { 580f46b5a66SChristoph Hellwig filemap_write_and_wait(src->i_mapping); 581f46b5a66SChristoph Hellwig lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); 582f46b5a66SChristoph Hellwig if (BTRFS_I(src)->delalloc_bytes == 0) 583f46b5a66SChristoph Hellwig break; 584f46b5a66SChristoph Hellwig unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); 585f46b5a66SChristoph Hellwig } 586f46b5a66SChristoph Hellwig 587f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 0); 588f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 589f46b5a66SChristoph Hellwig if (!path) { 590f46b5a66SChristoph Hellwig ret = -ENOMEM; 591f46b5a66SChristoph Hellwig goto out; 592f46b5a66SChristoph Hellwig } 593f46b5a66SChristoph Hellwig key.offset = 0; 594f46b5a66SChristoph Hellwig key.type = BTRFS_EXTENT_DATA_KEY; 595f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 596f46b5a66SChristoph Hellwig pos = 0; 597f46b5a66SChristoph Hellwig path->reada = 2; 598f46b5a66SChristoph Hellwig 599f46b5a66SChristoph Hellwig while (1) { 600f46b5a66SChristoph Hellwig /* 601f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 602f46b5a66SChristoph Hellwig * tree. 603f46b5a66SChristoph Hellwig */ 604f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 605f46b5a66SChristoph Hellwig if (ret < 0) 606f46b5a66SChristoph Hellwig goto out; 607f46b5a66SChristoph Hellwig 608f46b5a66SChristoph Hellwig if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { 609f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 610f46b5a66SChristoph Hellwig if (ret < 0) 611f46b5a66SChristoph Hellwig goto out; 612f46b5a66SChristoph Hellwig if (ret > 0) 613f46b5a66SChristoph Hellwig break; 614f46b5a66SChristoph Hellwig } 615f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 616f46b5a66SChristoph Hellwig slot = path->slots[0]; 617f46b5a66SChristoph Hellwig btrfs_item_key_to_cpu(leaf, &key, slot); 618f46b5a66SChristoph Hellwig nritems = btrfs_header_nritems(leaf); 619f46b5a66SChristoph Hellwig 620f46b5a66SChristoph Hellwig if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || 621f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 622f46b5a66SChristoph Hellwig break; 623f46b5a66SChristoph Hellwig 624f46b5a66SChristoph Hellwig if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 625f46b5a66SChristoph Hellwig struct btrfs_file_extent_item *extent; 626f46b5a66SChristoph Hellwig int found_type; 627f46b5a66SChristoph Hellwig pos = key.offset; 628f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 629f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 630f46b5a66SChristoph Hellwig found_type = btrfs_file_extent_type(leaf, extent); 631f46b5a66SChristoph Hellwig if (found_type == BTRFS_FILE_EXTENT_REG) { 632f46b5a66SChristoph Hellwig u64 len = btrfs_file_extent_num_bytes(leaf, 633f46b5a66SChristoph Hellwig extent); 634f46b5a66SChristoph Hellwig u64 ds = btrfs_file_extent_disk_bytenr(leaf, 635f46b5a66SChristoph Hellwig extent); 636f46b5a66SChristoph Hellwig u64 dl = btrfs_file_extent_disk_num_bytes(leaf, 637f46b5a66SChristoph Hellwig extent); 638f46b5a66SChristoph Hellwig u64 off = btrfs_file_extent_offset(leaf, 639f46b5a66SChristoph Hellwig extent); 640f46b5a66SChristoph Hellwig btrfs_insert_file_extent(trans, root, 641f46b5a66SChristoph Hellwig inode->i_ino, pos, 642f46b5a66SChristoph Hellwig ds, dl, len, off); 643f46b5a66SChristoph Hellwig /* ds == 0 means there's a hole */ 644f46b5a66SChristoph Hellwig if (ds != 0) { 645f46b5a66SChristoph Hellwig btrfs_inc_extent_ref(trans, root, 646f46b5a66SChristoph Hellwig ds, dl, 647f46b5a66SChristoph Hellwig root->root_key.objectid, 648f46b5a66SChristoph Hellwig trans->transid, 649f46b5a66SChristoph Hellwig inode->i_ino, pos); 650f46b5a66SChristoph Hellwig } 651f46b5a66SChristoph Hellwig pos = key.offset + len; 652f46b5a66SChristoph Hellwig } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { 653f46b5a66SChristoph Hellwig ret = dup_item_to_inode(trans, root, path, 654f46b5a66SChristoph Hellwig leaf, slot, &key, 655f46b5a66SChristoph Hellwig inode->i_ino); 656f46b5a66SChristoph Hellwig if (ret) 657f46b5a66SChristoph Hellwig goto out; 658f46b5a66SChristoph Hellwig pos = key.offset + btrfs_item_size_nr(leaf, 659f46b5a66SChristoph Hellwig slot); 660f46b5a66SChristoph Hellwig } 661f46b5a66SChristoph Hellwig } else if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { 662f46b5a66SChristoph Hellwig ret = dup_item_to_inode(trans, root, path, leaf, 663f46b5a66SChristoph Hellwig slot, &key, inode->i_ino); 664f46b5a66SChristoph Hellwig 665f46b5a66SChristoph Hellwig if (ret) 666f46b5a66SChristoph Hellwig goto out; 667f46b5a66SChristoph Hellwig } 668f46b5a66SChristoph Hellwig key.offset++; 669f46b5a66SChristoph Hellwig btrfs_release_path(root, path); 670f46b5a66SChristoph Hellwig } 671f46b5a66SChristoph Hellwig 672f46b5a66SChristoph Hellwig ret = 0; 673f46b5a66SChristoph Hellwig out: 674f46b5a66SChristoph Hellwig btrfs_free_path(path); 675f46b5a66SChristoph Hellwig 676f46b5a66SChristoph Hellwig inode->i_blocks = src->i_blocks; 677f46b5a66SChristoph Hellwig i_size_write(inode, src->i_size); 678f46b5a66SChristoph Hellwig btrfs_update_inode(trans, root, inode); 679f46b5a66SChristoph Hellwig 680f46b5a66SChristoph Hellwig unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); 681f46b5a66SChristoph Hellwig 682f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 683f46b5a66SChristoph Hellwig 684f46b5a66SChristoph Hellwig out_unlock: 685f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 686f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 687f46b5a66SChristoph Hellwig out_fput: 688f46b5a66SChristoph Hellwig fput(src_file); 689f46b5a66SChristoph Hellwig return ret; 690f46b5a66SChristoph Hellwig } 691f46b5a66SChristoph Hellwig 692f46b5a66SChristoph Hellwig /* 693f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 694f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 695f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 696f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 697f46b5a66SChristoph Hellwig */ 698f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_start(struct file *file) 699f46b5a66SChristoph Hellwig { 700f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 701f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 702f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 703f46b5a66SChristoph Hellwig int ret = 0; 704f46b5a66SChristoph Hellwig 705df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 706df5b5520SChristoph Hellwig return -EPERM; 707df5b5520SChristoph Hellwig 708f46b5a66SChristoph Hellwig if (file->private_data) { 709f46b5a66SChristoph Hellwig ret = -EINPROGRESS; 710f46b5a66SChristoph Hellwig goto out; 711f46b5a66SChristoph Hellwig } 712f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 0); 713f46b5a66SChristoph Hellwig if (trans) 714f46b5a66SChristoph Hellwig file->private_data = trans; 715f46b5a66SChristoph Hellwig else 716f46b5a66SChristoph Hellwig ret = -ENOMEM; 717f46b5a66SChristoph Hellwig /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ 718f46b5a66SChristoph Hellwig out: 719f46b5a66SChristoph Hellwig return ret; 720f46b5a66SChristoph Hellwig } 721f46b5a66SChristoph Hellwig 722f46b5a66SChristoph Hellwig /* 723f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 724f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 725f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 726f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 727f46b5a66SChristoph Hellwig */ 728f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 729f46b5a66SChristoph Hellwig { 730f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 731f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 732f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 733f46b5a66SChristoph Hellwig int ret = 0; 734f46b5a66SChristoph Hellwig 735f46b5a66SChristoph Hellwig trans = file->private_data; 736f46b5a66SChristoph Hellwig if (!trans) { 737f46b5a66SChristoph Hellwig ret = -EINVAL; 738f46b5a66SChristoph Hellwig goto out; 739f46b5a66SChristoph Hellwig } 740f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 741f46b5a66SChristoph Hellwig file->private_data = 0; 742f46b5a66SChristoph Hellwig out: 743f46b5a66SChristoph Hellwig return ret; 744f46b5a66SChristoph Hellwig } 745f46b5a66SChristoph Hellwig 746f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 747f46b5a66SChristoph Hellwig cmd, unsigned long arg) 748f46b5a66SChristoph Hellwig { 749f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 750f46b5a66SChristoph Hellwig 751f46b5a66SChristoph Hellwig switch (cmd) { 752f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 753f46b5a66SChristoph Hellwig return btrfs_ioctl_snap_create(root, (void __user *)arg); 754f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 755f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 756f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 757f46b5a66SChristoph Hellwig return btrfs_ioctl_resize(root, (void __user *)arg); 758f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 759f46b5a66SChristoph Hellwig return btrfs_ioctl_add_dev(root, (void __user *)arg); 760f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 761f46b5a66SChristoph Hellwig return btrfs_ioctl_rm_dev(root, (void __user *)arg); 762f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 763f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 764f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 765f46b5a66SChristoph Hellwig return btrfs_ioctl_clone(file, arg); 766f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 767f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 768f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 769f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 770f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 771f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 772f46b5a66SChristoph Hellwig return 0; 773f46b5a66SChristoph Hellwig } 774f46b5a66SChristoph Hellwig 775f46b5a66SChristoph Hellwig return -ENOTTY; 776f46b5a66SChristoph Hellwig } 777