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 mutex_lock(&root->fs_info->fs_mutex); 67f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, 1, 0); 68f46b5a66SChristoph Hellwig if (ret) 69f46b5a66SChristoph Hellwig goto fail_commit; 70f46b5a66SChristoph Hellwig 71f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 72f46b5a66SChristoph Hellwig BUG_ON(!trans); 73f46b5a66SChristoph Hellwig 74f46b5a66SChristoph Hellwig ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, 75f46b5a66SChristoph Hellwig 0, &objectid); 76f46b5a66SChristoph Hellwig if (ret) 77f46b5a66SChristoph Hellwig goto fail; 78f46b5a66SChristoph Hellwig 79925baeddSChris Mason leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 80f46b5a66SChristoph Hellwig objectid, trans->transid, 0, 0, 81f46b5a66SChristoph Hellwig 0, 0); 82f46b5a66SChristoph Hellwig if (IS_ERR(leaf)) 83f46b5a66SChristoph Hellwig return PTR_ERR(leaf); 84f46b5a66SChristoph Hellwig 85f46b5a66SChristoph Hellwig btrfs_set_header_nritems(leaf, 0); 86f46b5a66SChristoph Hellwig btrfs_set_header_level(leaf, 0); 87f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 88f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 89f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 90f46b5a66SChristoph Hellwig 91f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 92f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 93f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 94f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 95f46b5a66SChristoph Hellwig 96f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 97f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 98f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 99f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 100f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 101f46b5a66SChristoph Hellwig inode_item->nblocks = cpu_to_le64(1); 102f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 103f46b5a66SChristoph Hellwig 104f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 105f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 106f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 107f46b5a66SChristoph Hellwig btrfs_set_root_used(&root_item, 0); 108f46b5a66SChristoph Hellwig 109f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 110f46b5a66SChristoph Hellwig root_item.drop_level = 0; 111f46b5a66SChristoph Hellwig 112925baeddSChris Mason btrfs_tree_unlock(leaf); 113f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 114f46b5a66SChristoph Hellwig leaf = NULL; 115f46b5a66SChristoph Hellwig 116f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 117f46b5a66SChristoph Hellwig 118f46b5a66SChristoph Hellwig key.objectid = objectid; 119f46b5a66SChristoph Hellwig key.offset = 1; 120f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 121f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 122f46b5a66SChristoph Hellwig &root_item); 123f46b5a66SChristoph Hellwig if (ret) 124f46b5a66SChristoph Hellwig goto fail; 125f46b5a66SChristoph Hellwig 126f46b5a66SChristoph Hellwig /* 127f46b5a66SChristoph Hellwig * insert the directory item 128f46b5a66SChristoph Hellwig */ 129f46b5a66SChristoph Hellwig key.offset = (u64)-1; 130f46b5a66SChristoph Hellwig dir = root->fs_info->sb->s_root->d_inode; 131f46b5a66SChristoph Hellwig ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, 132f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 133f46b5a66SChristoph Hellwig BTRFS_FT_DIR); 134f46b5a66SChristoph Hellwig if (ret) 135f46b5a66SChristoph Hellwig goto fail; 136f46b5a66SChristoph Hellwig 137f46b5a66SChristoph Hellwig ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, 138f46b5a66SChristoph Hellwig name, namelen, objectid, 139f46b5a66SChristoph Hellwig root->fs_info->sb->s_root->d_inode->i_ino); 140f46b5a66SChristoph Hellwig if (ret) 141f46b5a66SChristoph Hellwig goto fail; 142f46b5a66SChristoph Hellwig 143f46b5a66SChristoph Hellwig ret = btrfs_commit_transaction(trans, root); 144f46b5a66SChristoph Hellwig if (ret) 145f46b5a66SChristoph Hellwig goto fail_commit; 146f46b5a66SChristoph Hellwig 147f46b5a66SChristoph Hellwig new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); 148f46b5a66SChristoph Hellwig BUG_ON(!new_root); 149f46b5a66SChristoph Hellwig 150f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(new_root, 1); 151f46b5a66SChristoph Hellwig BUG_ON(!trans); 152f46b5a66SChristoph Hellwig 153f46b5a66SChristoph Hellwig ret = btrfs_create_subvol_root(new_root, trans, new_dirid, 154f46b5a66SChristoph Hellwig BTRFS_I(dir)->block_group); 155f46b5a66SChristoph Hellwig if (ret) 156f46b5a66SChristoph Hellwig goto fail; 157f46b5a66SChristoph Hellwig 158f46b5a66SChristoph Hellwig /* Invalidate existing dcache entry for new subvolume. */ 159f46b5a66SChristoph Hellwig btrfs_invalidate_dcache_root(root, name, namelen); 160f46b5a66SChristoph Hellwig 161f46b5a66SChristoph Hellwig fail: 162f46b5a66SChristoph Hellwig nr = trans->blocks_used; 163f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, new_root); 164f46b5a66SChristoph Hellwig if (err && !ret) 165f46b5a66SChristoph Hellwig ret = err; 166f46b5a66SChristoph Hellwig fail_commit: 167f46b5a66SChristoph Hellwig mutex_unlock(&root->fs_info->fs_mutex); 168f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 169f46b5a66SChristoph Hellwig btrfs_throttle(root); 170f46b5a66SChristoph Hellwig return ret; 171f46b5a66SChristoph Hellwig } 172f46b5a66SChristoph Hellwig 173f46b5a66SChristoph Hellwig static int create_snapshot(struct btrfs_root *root, char *name, int namelen) 174f46b5a66SChristoph Hellwig { 175f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 176f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 177f46b5a66SChristoph Hellwig int ret; 178f46b5a66SChristoph Hellwig int err; 179f46b5a66SChristoph Hellwig unsigned long nr = 0; 180f46b5a66SChristoph Hellwig 181f46b5a66SChristoph Hellwig if (!root->ref_cows) 182f46b5a66SChristoph Hellwig return -EINVAL; 183f46b5a66SChristoph Hellwig 184f46b5a66SChristoph Hellwig mutex_lock(&root->fs_info->fs_mutex); 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 mutex_unlock(&root->fs_info->fs_mutex); 212f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 213f46b5a66SChristoph Hellwig btrfs_throttle(root); 214f46b5a66SChristoph Hellwig return ret; 215f46b5a66SChristoph Hellwig } 216f46b5a66SChristoph Hellwig 217f46b5a66SChristoph Hellwig int btrfs_defrag_file(struct file *file) 218f46b5a66SChristoph Hellwig { 219f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 220f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 221f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 222f46b5a66SChristoph Hellwig struct page *page; 223f46b5a66SChristoph Hellwig unsigned long last_index; 224f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 225f46b5a66SChristoph Hellwig unsigned long total_read = 0; 226f46b5a66SChristoph Hellwig u64 page_start; 227f46b5a66SChristoph Hellwig u64 page_end; 228f46b5a66SChristoph Hellwig unsigned long i; 229f46b5a66SChristoph Hellwig int ret; 230f46b5a66SChristoph Hellwig 231f46b5a66SChristoph Hellwig mutex_lock(&root->fs_info->fs_mutex); 232f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, inode->i_size, 0); 233f46b5a66SChristoph Hellwig mutex_unlock(&root->fs_info->fs_mutex); 234f46b5a66SChristoph Hellwig if (ret) 235f46b5a66SChristoph Hellwig return -ENOSPC; 236f46b5a66SChristoph Hellwig 237f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 238f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 239f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 240f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 241f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 242f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 243f46b5a66SChristoph Hellwig } 244f46b5a66SChristoph Hellwig total_read++; 245f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 246f46b5a66SChristoph Hellwig if (!page) 247f46b5a66SChristoph Hellwig goto out_unlock; 248f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 249f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 250f46b5a66SChristoph Hellwig lock_page(page); 251f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 252f46b5a66SChristoph Hellwig unlock_page(page); 253f46b5a66SChristoph Hellwig page_cache_release(page); 254f46b5a66SChristoph Hellwig goto out_unlock; 255f46b5a66SChristoph Hellwig } 256f46b5a66SChristoph Hellwig } 257f46b5a66SChristoph Hellwig 258f46b5a66SChristoph Hellwig #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) 259f46b5a66SChristoph Hellwig ClearPageDirty(page); 260f46b5a66SChristoph Hellwig #else 261f46b5a66SChristoph Hellwig cancel_dirty_page(page, PAGE_CACHE_SIZE); 262f46b5a66SChristoph Hellwig #endif 263f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 264f46b5a66SChristoph Hellwig set_page_extent_mapped(page); 265f46b5a66SChristoph Hellwig 266f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 267f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 268f46b5a66SChristoph Hellwig 269f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 270f46b5a66SChristoph Hellwig set_extent_delalloc(io_tree, page_start, 271f46b5a66SChristoph Hellwig page_end, GFP_NOFS); 272f46b5a66SChristoph Hellwig 273f46b5a66SChristoph Hellwig unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 274f46b5a66SChristoph Hellwig set_page_dirty(page); 275f46b5a66SChristoph Hellwig unlock_page(page); 276f46b5a66SChristoph Hellwig page_cache_release(page); 277f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 278f46b5a66SChristoph Hellwig } 279f46b5a66SChristoph Hellwig 280f46b5a66SChristoph Hellwig out_unlock: 281f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 282f46b5a66SChristoph Hellwig return 0; 283f46b5a66SChristoph Hellwig } 284f46b5a66SChristoph Hellwig 285f46b5a66SChristoph Hellwig /* 286f46b5a66SChristoph Hellwig * Called inside transaction, so use GFP_NOFS 287f46b5a66SChristoph Hellwig */ 288f46b5a66SChristoph Hellwig 289f46b5a66SChristoph Hellwig static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) 290f46b5a66SChristoph Hellwig { 291f46b5a66SChristoph Hellwig u64 new_size; 292f46b5a66SChristoph Hellwig u64 old_size; 293f46b5a66SChristoph Hellwig u64 devid = 1; 294f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 295f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 296f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 297f46b5a66SChristoph Hellwig char *sizestr; 298f46b5a66SChristoph Hellwig char *devstr = NULL; 299f46b5a66SChristoph Hellwig int ret = 0; 300f46b5a66SChristoph Hellwig int namelen; 301f46b5a66SChristoph Hellwig int mod = 0; 302f46b5a66SChristoph Hellwig 303f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 304f46b5a66SChristoph Hellwig 305f46b5a66SChristoph Hellwig if (!vol_args) 306f46b5a66SChristoph Hellwig return -ENOMEM; 307f46b5a66SChristoph Hellwig 308f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 309f46b5a66SChristoph Hellwig ret = -EFAULT; 310f46b5a66SChristoph Hellwig goto out; 311f46b5a66SChristoph Hellwig } 312f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 313f46b5a66SChristoph Hellwig if (namelen > BTRFS_VOL_NAME_MAX) { 314f46b5a66SChristoph Hellwig ret = -EINVAL; 315f46b5a66SChristoph Hellwig goto out; 316f46b5a66SChristoph Hellwig } 317f46b5a66SChristoph Hellwig 318f46b5a66SChristoph Hellwig mutex_lock(&root->fs_info->fs_mutex); 319f46b5a66SChristoph Hellwig sizestr = vol_args->name; 320f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 321f46b5a66SChristoph Hellwig if (devstr) { 322f46b5a66SChristoph Hellwig char *end; 323f46b5a66SChristoph Hellwig sizestr = devstr + 1; 324f46b5a66SChristoph Hellwig *devstr = '\0'; 325f46b5a66SChristoph Hellwig devstr = vol_args->name; 326f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 327f46b5a66SChristoph Hellwig printk(KERN_INFO "resizing devid %llu\n", devid); 328f46b5a66SChristoph Hellwig } 329f46b5a66SChristoph Hellwig device = btrfs_find_device(root, devid, NULL); 330f46b5a66SChristoph Hellwig if (!device) { 331f46b5a66SChristoph Hellwig printk(KERN_INFO "resizer unable to find device %llu\n", devid); 332f46b5a66SChristoph Hellwig ret = -EINVAL; 333f46b5a66SChristoph Hellwig goto out_unlock; 334f46b5a66SChristoph Hellwig } 335f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 336f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 337f46b5a66SChristoph Hellwig else { 338f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 339f46b5a66SChristoph Hellwig mod = -1; 340f46b5a66SChristoph Hellwig sizestr++; 341f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 342f46b5a66SChristoph Hellwig mod = 1; 343f46b5a66SChristoph Hellwig sizestr++; 344f46b5a66SChristoph Hellwig } 345f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 346f46b5a66SChristoph Hellwig if (new_size == 0) { 347f46b5a66SChristoph Hellwig ret = -EINVAL; 348f46b5a66SChristoph Hellwig goto out_unlock; 349f46b5a66SChristoph Hellwig } 350f46b5a66SChristoph Hellwig } 351f46b5a66SChristoph Hellwig 352f46b5a66SChristoph Hellwig old_size = device->total_bytes; 353f46b5a66SChristoph Hellwig 354f46b5a66SChristoph Hellwig if (mod < 0) { 355f46b5a66SChristoph Hellwig if (new_size > old_size) { 356f46b5a66SChristoph Hellwig ret = -EINVAL; 357f46b5a66SChristoph Hellwig goto out_unlock; 358f46b5a66SChristoph Hellwig } 359f46b5a66SChristoph Hellwig new_size = old_size - new_size; 360f46b5a66SChristoph Hellwig } else if (mod > 0) { 361f46b5a66SChristoph Hellwig new_size = old_size + new_size; 362f46b5a66SChristoph Hellwig } 363f46b5a66SChristoph Hellwig 364f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 365f46b5a66SChristoph Hellwig ret = -EINVAL; 366f46b5a66SChristoph Hellwig goto out_unlock; 367f46b5a66SChristoph Hellwig } 368f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 369f46b5a66SChristoph Hellwig ret = -EFBIG; 370f46b5a66SChristoph Hellwig goto out_unlock; 371f46b5a66SChristoph Hellwig } 372f46b5a66SChristoph Hellwig 373f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 374f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 375f46b5a66SChristoph Hellwig 376f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 377f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 378f46b5a66SChristoph Hellwig 379f46b5a66SChristoph Hellwig if (new_size > old_size) { 380f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 381f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 382f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 383f46b5a66SChristoph Hellwig } else { 384f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 385f46b5a66SChristoph Hellwig } 386f46b5a66SChristoph Hellwig 387f46b5a66SChristoph Hellwig out_unlock: 388f46b5a66SChristoph Hellwig mutex_unlock(&root->fs_info->fs_mutex); 389f46b5a66SChristoph Hellwig out: 390f46b5a66SChristoph Hellwig kfree(vol_args); 391f46b5a66SChristoph Hellwig return ret; 392f46b5a66SChristoph Hellwig } 393f46b5a66SChristoph Hellwig 394f46b5a66SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct btrfs_root *root, 395f46b5a66SChristoph Hellwig void __user *arg) 396f46b5a66SChristoph Hellwig { 397f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 398f46b5a66SChristoph Hellwig struct btrfs_dir_item *di; 399f46b5a66SChristoph Hellwig struct btrfs_path *path; 400f46b5a66SChristoph Hellwig u64 root_dirid; 401f46b5a66SChristoph Hellwig int namelen; 402f46b5a66SChristoph Hellwig int ret; 403f46b5a66SChristoph Hellwig 404f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 405f46b5a66SChristoph Hellwig 406f46b5a66SChristoph Hellwig if (!vol_args) 407f46b5a66SChristoph Hellwig return -ENOMEM; 408f46b5a66SChristoph Hellwig 409f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 410f46b5a66SChristoph Hellwig ret = -EFAULT; 411f46b5a66SChristoph Hellwig goto out; 412f46b5a66SChristoph Hellwig } 413f46b5a66SChristoph Hellwig 414f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 415f46b5a66SChristoph Hellwig if (namelen > BTRFS_VOL_NAME_MAX) { 416f46b5a66SChristoph Hellwig ret = -EINVAL; 417f46b5a66SChristoph Hellwig goto out; 418f46b5a66SChristoph Hellwig } 419f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 420f46b5a66SChristoph Hellwig ret = -EINVAL; 421f46b5a66SChristoph Hellwig goto out; 422f46b5a66SChristoph Hellwig } 423f46b5a66SChristoph Hellwig 424f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 425f46b5a66SChristoph Hellwig if (!path) { 426f46b5a66SChristoph Hellwig ret = -ENOMEM; 427f46b5a66SChristoph Hellwig goto out; 428f46b5a66SChristoph Hellwig } 429f46b5a66SChristoph Hellwig 430f46b5a66SChristoph Hellwig root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, 431f46b5a66SChristoph Hellwig mutex_lock(&root->fs_info->fs_mutex); 432f46b5a66SChristoph Hellwig di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, 433f46b5a66SChristoph Hellwig path, root_dirid, 434f46b5a66SChristoph Hellwig vol_args->name, namelen, 0); 435f46b5a66SChristoph Hellwig mutex_unlock(&root->fs_info->fs_mutex); 436f46b5a66SChristoph Hellwig btrfs_free_path(path); 437f46b5a66SChristoph Hellwig 438f46b5a66SChristoph Hellwig if (di && !IS_ERR(di)) { 439f46b5a66SChristoph Hellwig ret = -EEXIST; 440f46b5a66SChristoph Hellwig goto out; 441f46b5a66SChristoph Hellwig } 442f46b5a66SChristoph Hellwig 443f46b5a66SChristoph Hellwig if (IS_ERR(di)) { 444f46b5a66SChristoph Hellwig ret = PTR_ERR(di); 445f46b5a66SChristoph Hellwig goto out; 446f46b5a66SChristoph Hellwig } 447f46b5a66SChristoph Hellwig 448f46b5a66SChristoph Hellwig if (root == root->fs_info->tree_root) 449f46b5a66SChristoph Hellwig ret = create_subvol(root, vol_args->name, namelen); 450f46b5a66SChristoph Hellwig else 451f46b5a66SChristoph Hellwig ret = create_snapshot(root, vol_args->name, namelen); 452f46b5a66SChristoph Hellwig out: 453f46b5a66SChristoph Hellwig kfree(vol_args); 454f46b5a66SChristoph Hellwig return ret; 455f46b5a66SChristoph Hellwig } 456f46b5a66SChristoph Hellwig 457f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 458f46b5a66SChristoph Hellwig { 459f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 460f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 461f46b5a66SChristoph Hellwig 462f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 463f46b5a66SChristoph Hellwig case S_IFDIR: 464f46b5a66SChristoph Hellwig mutex_lock(&root->fs_info->fs_mutex); 465f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 466f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 467f46b5a66SChristoph Hellwig mutex_unlock(&root->fs_info->fs_mutex); 468f46b5a66SChristoph Hellwig break; 469f46b5a66SChristoph Hellwig case S_IFREG: 470f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 471f46b5a66SChristoph Hellwig break; 472f46b5a66SChristoph Hellwig } 473f46b5a66SChristoph Hellwig 474f46b5a66SChristoph Hellwig return 0; 475f46b5a66SChristoph Hellwig } 476f46b5a66SChristoph Hellwig 477f46b5a66SChristoph Hellwig long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 478f46b5a66SChristoph Hellwig { 479f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 480f46b5a66SChristoph Hellwig int ret; 481f46b5a66SChristoph Hellwig 482f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 483f46b5a66SChristoph Hellwig 484f46b5a66SChristoph Hellwig if (!vol_args) 485f46b5a66SChristoph Hellwig return -ENOMEM; 486f46b5a66SChristoph Hellwig 487f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 488f46b5a66SChristoph Hellwig ret = -EFAULT; 489f46b5a66SChristoph Hellwig goto out; 490f46b5a66SChristoph Hellwig } 491f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 492f46b5a66SChristoph Hellwig 493f46b5a66SChristoph Hellwig out: 494f46b5a66SChristoph Hellwig kfree(vol_args); 495f46b5a66SChristoph Hellwig return ret; 496f46b5a66SChristoph Hellwig } 497f46b5a66SChristoph Hellwig 498f46b5a66SChristoph Hellwig long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 499f46b5a66SChristoph Hellwig { 500f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 501f46b5a66SChristoph Hellwig int ret; 502f46b5a66SChristoph Hellwig 503f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 504f46b5a66SChristoph Hellwig 505f46b5a66SChristoph Hellwig if (!vol_args) 506f46b5a66SChristoph Hellwig return -ENOMEM; 507f46b5a66SChristoph Hellwig 508f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 509f46b5a66SChristoph Hellwig ret = -EFAULT; 510f46b5a66SChristoph Hellwig goto out; 511f46b5a66SChristoph Hellwig } 512f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 513f46b5a66SChristoph Hellwig 514f46b5a66SChristoph Hellwig out: 515f46b5a66SChristoph Hellwig kfree(vol_args); 516f46b5a66SChristoph Hellwig return ret; 517f46b5a66SChristoph Hellwig } 518f46b5a66SChristoph Hellwig 519f46b5a66SChristoph Hellwig int dup_item_to_inode(struct btrfs_trans_handle *trans, 520f46b5a66SChristoph Hellwig struct btrfs_root *root, 521f46b5a66SChristoph Hellwig struct btrfs_path *path, 522f46b5a66SChristoph Hellwig struct extent_buffer *leaf, 523f46b5a66SChristoph Hellwig int slot, 524f46b5a66SChristoph Hellwig struct btrfs_key *key, 525f46b5a66SChristoph Hellwig u64 destino) 526f46b5a66SChristoph Hellwig { 527f46b5a66SChristoph Hellwig char *dup; 528f46b5a66SChristoph Hellwig int len = btrfs_item_size_nr(leaf, slot); 529f46b5a66SChristoph Hellwig struct btrfs_key ckey = *key; 530f46b5a66SChristoph Hellwig int ret = 0; 531f46b5a66SChristoph Hellwig 532f46b5a66SChristoph Hellwig dup = kmalloc(len, GFP_NOFS); 533f46b5a66SChristoph Hellwig if (!dup) 534f46b5a66SChristoph Hellwig return -ENOMEM; 535f46b5a66SChristoph Hellwig 536f46b5a66SChristoph Hellwig read_extent_buffer(leaf, dup, btrfs_item_ptr_offset(leaf, slot), len); 537f46b5a66SChristoph Hellwig btrfs_release_path(root, path); 538f46b5a66SChristoph Hellwig 539f46b5a66SChristoph Hellwig ckey.objectid = destino; 540f46b5a66SChristoph Hellwig ret = btrfs_insert_item(trans, root, &ckey, dup, len); 541f46b5a66SChristoph Hellwig kfree(dup); 542f46b5a66SChristoph Hellwig return ret; 543f46b5a66SChristoph Hellwig } 544f46b5a66SChristoph Hellwig 545f46b5a66SChristoph Hellwig long btrfs_ioctl_clone(struct file *file, unsigned long src_fd) 546f46b5a66SChristoph Hellwig { 547f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 548f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 549f46b5a66SChristoph Hellwig struct file *src_file; 550f46b5a66SChristoph Hellwig struct inode *src; 551f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 552f46b5a66SChristoph Hellwig int ret; 553f46b5a66SChristoph Hellwig u64 pos; 554f46b5a66SChristoph Hellwig struct btrfs_path *path; 555f46b5a66SChristoph Hellwig struct btrfs_key key; 556f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 557f46b5a66SChristoph Hellwig u32 nritems; 558f46b5a66SChristoph Hellwig int slot; 559f46b5a66SChristoph Hellwig 560f46b5a66SChristoph Hellwig src_file = fget(src_fd); 561f46b5a66SChristoph Hellwig if (!src_file) 562f46b5a66SChristoph Hellwig return -EBADF; 563f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 564f46b5a66SChristoph Hellwig 565f46b5a66SChristoph Hellwig ret = -EXDEV; 566f46b5a66SChristoph Hellwig if (src->i_sb != inode->i_sb) 567f46b5a66SChristoph Hellwig goto out_fput; 568f46b5a66SChristoph Hellwig 569f46b5a66SChristoph Hellwig if (inode < src) { 570f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 571f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 572f46b5a66SChristoph Hellwig } else { 573f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 574f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 575f46b5a66SChristoph Hellwig } 576f46b5a66SChristoph Hellwig 577f46b5a66SChristoph Hellwig ret = -ENOTEMPTY; 578f46b5a66SChristoph Hellwig if (inode->i_size) 579f46b5a66SChristoph Hellwig goto out_unlock; 580f46b5a66SChristoph Hellwig 581f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 582f46b5a66SChristoph Hellwig another, and lock file content */ 583f46b5a66SChristoph Hellwig while (1) { 584f46b5a66SChristoph Hellwig filemap_write_and_wait(src->i_mapping); 585f46b5a66SChristoph Hellwig lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); 586f46b5a66SChristoph Hellwig if (BTRFS_I(src)->delalloc_bytes == 0) 587f46b5a66SChristoph Hellwig break; 588f46b5a66SChristoph Hellwig unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); 589f46b5a66SChristoph Hellwig } 590f46b5a66SChristoph Hellwig 591f46b5a66SChristoph Hellwig mutex_lock(&root->fs_info->fs_mutex); 592f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 0); 593f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 594f46b5a66SChristoph Hellwig if (!path) { 595f46b5a66SChristoph Hellwig ret = -ENOMEM; 596f46b5a66SChristoph Hellwig goto out; 597f46b5a66SChristoph Hellwig } 598f46b5a66SChristoph Hellwig key.offset = 0; 599f46b5a66SChristoph Hellwig key.type = BTRFS_EXTENT_DATA_KEY; 600f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 601f46b5a66SChristoph Hellwig pos = 0; 602f46b5a66SChristoph Hellwig path->reada = 2; 603f46b5a66SChristoph Hellwig 604f46b5a66SChristoph Hellwig while (1) { 605f46b5a66SChristoph Hellwig /* 606f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 607f46b5a66SChristoph Hellwig * tree. 608f46b5a66SChristoph Hellwig */ 609f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 610f46b5a66SChristoph Hellwig if (ret < 0) 611f46b5a66SChristoph Hellwig goto out; 612f46b5a66SChristoph Hellwig 613f46b5a66SChristoph Hellwig if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { 614f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 615f46b5a66SChristoph Hellwig if (ret < 0) 616f46b5a66SChristoph Hellwig goto out; 617f46b5a66SChristoph Hellwig if (ret > 0) 618f46b5a66SChristoph Hellwig break; 619f46b5a66SChristoph Hellwig } 620f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 621f46b5a66SChristoph Hellwig slot = path->slots[0]; 622f46b5a66SChristoph Hellwig btrfs_item_key_to_cpu(leaf, &key, slot); 623f46b5a66SChristoph Hellwig nritems = btrfs_header_nritems(leaf); 624f46b5a66SChristoph Hellwig 625f46b5a66SChristoph Hellwig if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || 626f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 627f46b5a66SChristoph Hellwig break; 628f46b5a66SChristoph Hellwig 629f46b5a66SChristoph Hellwig if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 630f46b5a66SChristoph Hellwig struct btrfs_file_extent_item *extent; 631f46b5a66SChristoph Hellwig int found_type; 632f46b5a66SChristoph Hellwig pos = key.offset; 633f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 634f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 635f46b5a66SChristoph Hellwig found_type = btrfs_file_extent_type(leaf, extent); 636f46b5a66SChristoph Hellwig if (found_type == BTRFS_FILE_EXTENT_REG) { 637f46b5a66SChristoph Hellwig u64 len = btrfs_file_extent_num_bytes(leaf, 638f46b5a66SChristoph Hellwig extent); 639f46b5a66SChristoph Hellwig u64 ds = btrfs_file_extent_disk_bytenr(leaf, 640f46b5a66SChristoph Hellwig extent); 641f46b5a66SChristoph Hellwig u64 dl = btrfs_file_extent_disk_num_bytes(leaf, 642f46b5a66SChristoph Hellwig extent); 643f46b5a66SChristoph Hellwig u64 off = btrfs_file_extent_offset(leaf, 644f46b5a66SChristoph Hellwig extent); 645f46b5a66SChristoph Hellwig btrfs_insert_file_extent(trans, root, 646f46b5a66SChristoph Hellwig inode->i_ino, pos, 647f46b5a66SChristoph Hellwig ds, dl, len, off); 648f46b5a66SChristoph Hellwig /* ds == 0 means there's a hole */ 649f46b5a66SChristoph Hellwig if (ds != 0) { 650f46b5a66SChristoph Hellwig btrfs_inc_extent_ref(trans, root, 651f46b5a66SChristoph Hellwig ds, dl, 652f46b5a66SChristoph Hellwig root->root_key.objectid, 653f46b5a66SChristoph Hellwig trans->transid, 654f46b5a66SChristoph Hellwig inode->i_ino, pos); 655f46b5a66SChristoph Hellwig } 656f46b5a66SChristoph Hellwig pos = key.offset + len; 657f46b5a66SChristoph Hellwig } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { 658f46b5a66SChristoph Hellwig ret = dup_item_to_inode(trans, root, path, 659f46b5a66SChristoph Hellwig leaf, slot, &key, 660f46b5a66SChristoph Hellwig inode->i_ino); 661f46b5a66SChristoph Hellwig if (ret) 662f46b5a66SChristoph Hellwig goto out; 663f46b5a66SChristoph Hellwig pos = key.offset + btrfs_item_size_nr(leaf, 664f46b5a66SChristoph Hellwig slot); 665f46b5a66SChristoph Hellwig } 666f46b5a66SChristoph Hellwig } else if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { 667f46b5a66SChristoph Hellwig ret = dup_item_to_inode(trans, root, path, leaf, 668f46b5a66SChristoph Hellwig slot, &key, inode->i_ino); 669f46b5a66SChristoph Hellwig 670f46b5a66SChristoph Hellwig if (ret) 671f46b5a66SChristoph Hellwig goto out; 672f46b5a66SChristoph Hellwig } 673f46b5a66SChristoph Hellwig key.offset++; 674f46b5a66SChristoph Hellwig btrfs_release_path(root, path); 675f46b5a66SChristoph Hellwig } 676f46b5a66SChristoph Hellwig 677f46b5a66SChristoph Hellwig ret = 0; 678f46b5a66SChristoph Hellwig out: 679f46b5a66SChristoph Hellwig btrfs_free_path(path); 680f46b5a66SChristoph Hellwig 681f46b5a66SChristoph Hellwig inode->i_blocks = src->i_blocks; 682f46b5a66SChristoph Hellwig i_size_write(inode, src->i_size); 683f46b5a66SChristoph Hellwig btrfs_update_inode(trans, root, inode); 684f46b5a66SChristoph Hellwig 685f46b5a66SChristoph Hellwig unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); 686f46b5a66SChristoph Hellwig 687f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 688f46b5a66SChristoph Hellwig mutex_unlock(&root->fs_info->fs_mutex); 689f46b5a66SChristoph Hellwig 690f46b5a66SChristoph Hellwig out_unlock: 691f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 692f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 693f46b5a66SChristoph Hellwig out_fput: 694f46b5a66SChristoph Hellwig fput(src_file); 695f46b5a66SChristoph Hellwig return ret; 696f46b5a66SChristoph Hellwig } 697f46b5a66SChristoph Hellwig 698f46b5a66SChristoph Hellwig /* 699f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 700f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 701f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 702f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 703f46b5a66SChristoph Hellwig */ 704f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_start(struct file *file) 705f46b5a66SChristoph Hellwig { 706f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 707f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 708f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 709f46b5a66SChristoph Hellwig int ret = 0; 710f46b5a66SChristoph Hellwig 711df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 712df5b5520SChristoph Hellwig return -EPERM; 713df5b5520SChristoph Hellwig 714f46b5a66SChristoph Hellwig mutex_lock(&root->fs_info->fs_mutex); 715f46b5a66SChristoph Hellwig if (file->private_data) { 716f46b5a66SChristoph Hellwig ret = -EINPROGRESS; 717f46b5a66SChristoph Hellwig goto out; 718f46b5a66SChristoph Hellwig } 719f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 0); 720f46b5a66SChristoph Hellwig if (trans) 721f46b5a66SChristoph Hellwig file->private_data = trans; 722f46b5a66SChristoph Hellwig else 723f46b5a66SChristoph Hellwig ret = -ENOMEM; 724f46b5a66SChristoph Hellwig /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ 725f46b5a66SChristoph Hellwig out: 726f46b5a66SChristoph Hellwig mutex_unlock(&root->fs_info->fs_mutex); 727f46b5a66SChristoph Hellwig return ret; 728f46b5a66SChristoph Hellwig } 729f46b5a66SChristoph Hellwig 730f46b5a66SChristoph Hellwig /* 731f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 732f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 733f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 734f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 735f46b5a66SChristoph Hellwig */ 736f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 737f46b5a66SChristoph Hellwig { 738f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 739f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 740f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 741f46b5a66SChristoph Hellwig int ret = 0; 742f46b5a66SChristoph Hellwig 743f46b5a66SChristoph Hellwig mutex_lock(&root->fs_info->fs_mutex); 744f46b5a66SChristoph Hellwig trans = file->private_data; 745f46b5a66SChristoph Hellwig if (!trans) { 746f46b5a66SChristoph Hellwig ret = -EINVAL; 747f46b5a66SChristoph Hellwig goto out; 748f46b5a66SChristoph Hellwig } 749f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 750f46b5a66SChristoph Hellwig file->private_data = 0; 751f46b5a66SChristoph Hellwig out: 752f46b5a66SChristoph Hellwig mutex_unlock(&root->fs_info->fs_mutex); 753f46b5a66SChristoph Hellwig return ret; 754f46b5a66SChristoph Hellwig } 755f46b5a66SChristoph Hellwig 756f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 757f46b5a66SChristoph Hellwig cmd, unsigned long arg) 758f46b5a66SChristoph Hellwig { 759f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 760f46b5a66SChristoph Hellwig 761f46b5a66SChristoph Hellwig switch (cmd) { 762f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 763f46b5a66SChristoph Hellwig return btrfs_ioctl_snap_create(root, (void __user *)arg); 764f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 765f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 766f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 767f46b5a66SChristoph Hellwig return btrfs_ioctl_resize(root, (void __user *)arg); 768f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 769f46b5a66SChristoph Hellwig return btrfs_ioctl_add_dev(root, (void __user *)arg); 770f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 771f46b5a66SChristoph Hellwig return btrfs_ioctl_rm_dev(root, (void __user *)arg); 772f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 773f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 774f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 775f46b5a66SChristoph Hellwig return btrfs_ioctl_clone(file, arg); 776f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 777f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 778f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 779f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 780f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 781f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 782f46b5a66SChristoph Hellwig return 0; 783f46b5a66SChristoph Hellwig } 784f46b5a66SChristoph Hellwig 785f46b5a66SChristoph Hellwig return -ENOTTY; 786f46b5a66SChristoph Hellwig } 787