1237fead6SMichael Halcrow /** 2237fead6SMichael Halcrow * eCryptfs: Linux filesystem encryption layer 3237fead6SMichael Halcrow * 4237fead6SMichael Halcrow * Copyright (C) 1997-2004 Erez Zadok 5237fead6SMichael Halcrow * Copyright (C) 2001-2004 Stony Brook University 6dd2a3b7aSMichael Halcrow * Copyright (C) 2004-2007 International Business Machines Corp. 7237fead6SMichael Halcrow * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> 8237fead6SMichael Halcrow * Michael C. Thompsion <mcthomps@us.ibm.com> 9237fead6SMichael Halcrow * 10237fead6SMichael Halcrow * This program is free software; you can redistribute it and/or 11237fead6SMichael Halcrow * modify it under the terms of the GNU General Public License as 12237fead6SMichael Halcrow * published by the Free Software Foundation; either version 2 of the 13237fead6SMichael Halcrow * License, or (at your option) any later version. 14237fead6SMichael Halcrow * 15237fead6SMichael Halcrow * This program is distributed in the hope that it will be useful, but 16237fead6SMichael Halcrow * WITHOUT ANY WARRANTY; without even the implied warranty of 17237fead6SMichael Halcrow * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18237fead6SMichael Halcrow * General Public License for more details. 19237fead6SMichael Halcrow * 20237fead6SMichael Halcrow * You should have received a copy of the GNU General Public License 21237fead6SMichael Halcrow * along with this program; if not, write to the Free Software 22237fead6SMichael Halcrow * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 23237fead6SMichael Halcrow * 02111-1307, USA. 24237fead6SMichael Halcrow */ 25237fead6SMichael Halcrow 26237fead6SMichael Halcrow #include <linux/file.h> 27237fead6SMichael Halcrow #include <linux/vmalloc.h> 28237fead6SMichael Halcrow #include <linux/pagemap.h> 29237fead6SMichael Halcrow #include <linux/dcache.h> 30237fead6SMichael Halcrow #include <linux/namei.h> 31237fead6SMichael Halcrow #include <linux/mount.h> 32237fead6SMichael Halcrow #include <linux/crypto.h> 330cc72dc7SJosef "Jeff" Sipek #include <linux/fs_stack.h> 340a688ad7SHarvey Harrison #include <asm/unaligned.h> 35237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 36237fead6SMichael Halcrow 37237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 38237fead6SMichael Halcrow { 39237fead6SMichael Halcrow struct dentry *dir; 40237fead6SMichael Halcrow 418dc4e373SMiklos Szeredi dir = dget_parent(dentry); 42908e0a8aSPeter Zijlstra mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); 43237fead6SMichael Halcrow return dir; 44237fead6SMichael Halcrow } 45237fead6SMichael Halcrow 46237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 47237fead6SMichael Halcrow { 48237fead6SMichael Halcrow mutex_unlock(&dir->d_inode->i_mutex); 49237fead6SMichael Halcrow dput(dir); 50237fead6SMichael Halcrow } 51237fead6SMichael Halcrow 52237fead6SMichael Halcrow /** 53237fead6SMichael Halcrow * ecryptfs_create_underlying_file 54237fead6SMichael Halcrow * @lower_dir_inode: inode of the parent in the lower fs of the new file 55f70f582fSQinghuang Feng * @dentry: New file's dentry 56237fead6SMichael Halcrow * @mode: The mode of the new file 57237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 58237fead6SMichael Halcrow * 59237fead6SMichael Halcrow * Creates the file in the lower file system. 60237fead6SMichael Halcrow * 61237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 62237fead6SMichael Halcrow */ 63237fead6SMichael Halcrow static int 64237fead6SMichael Halcrow ecryptfs_create_underlying_file(struct inode *lower_dir_inode, 65237fead6SMichael Halcrow struct dentry *dentry, int mode, 66237fead6SMichael Halcrow struct nameidata *nd) 67237fead6SMichael Halcrow { 68237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 69237fead6SMichael Halcrow struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); 70237fead6SMichael Halcrow struct dentry *dentry_save; 71237fead6SMichael Halcrow struct vfsmount *vfsmount_save; 72237fead6SMichael Halcrow int rc; 73237fead6SMichael Halcrow 744ac91378SJan Blunck dentry_save = nd->path.dentry; 754ac91378SJan Blunck vfsmount_save = nd->path.mnt; 764ac91378SJan Blunck nd->path.dentry = lower_dentry; 774ac91378SJan Blunck nd->path.mnt = lower_mnt; 78237fead6SMichael Halcrow rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); 794ac91378SJan Blunck nd->path.dentry = dentry_save; 804ac91378SJan Blunck nd->path.mnt = vfsmount_save; 81237fead6SMichael Halcrow return rc; 82237fead6SMichael Halcrow } 83237fead6SMichael Halcrow 84237fead6SMichael Halcrow /** 85237fead6SMichael Halcrow * ecryptfs_do_create 86237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 87237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 88237fead6SMichael Halcrow * @mode: The mode of the new file 89237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 90237fead6SMichael Halcrow * 91237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 92237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 93237fead6SMichael Halcrow * stat of the lower directory inode. 94237fead6SMichael Halcrow * 95237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 96237fead6SMichael Halcrow */ 97237fead6SMichael Halcrow static int 98237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 99237fead6SMichael Halcrow struct dentry *ecryptfs_dentry, int mode, 100237fead6SMichael Halcrow struct nameidata *nd) 101237fead6SMichael Halcrow { 102237fead6SMichael Halcrow int rc; 103237fead6SMichael Halcrow struct dentry *lower_dentry; 104237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 105237fead6SMichael Halcrow 106237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 107237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 108801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 109237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 110237fead6SMichael Halcrow "dentry\n"); 111237fead6SMichael Halcrow rc = PTR_ERR(lower_dir_dentry); 112237fead6SMichael Halcrow goto out; 113237fead6SMichael Halcrow } 114237fead6SMichael Halcrow rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, 115237fead6SMichael Halcrow ecryptfs_dentry, mode, nd); 1164981e081SMichael Halcrow if (rc) { 117caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 11818d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 119237fead6SMichael Halcrow goto out_lock; 120237fead6SMichael Halcrow } 121237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 122237fead6SMichael Halcrow directory_inode->i_sb, 0); 123237fead6SMichael Halcrow if (rc) { 124237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); 125237fead6SMichael Halcrow goto out_lock; 126237fead6SMichael Halcrow } 1270cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 1280cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 129237fead6SMichael Halcrow out_lock: 130237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 131237fead6SMichael Halcrow out: 132237fead6SMichael Halcrow return rc; 133237fead6SMichael Halcrow } 134237fead6SMichael Halcrow 135237fead6SMichael Halcrow /** 136237fead6SMichael Halcrow * grow_file 137d7cdc5feSMichael Halcrow * @ecryptfs_dentry: the eCryptfs dentry 138237fead6SMichael Halcrow * 139237fead6SMichael Halcrow * This is the code which will grow the file to its correct size. 140237fead6SMichael Halcrow */ 141d7cdc5feSMichael Halcrow static int grow_file(struct dentry *ecryptfs_dentry) 142237fead6SMichael Halcrow { 143d7cdc5feSMichael Halcrow struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; 144237fead6SMichael Halcrow struct file fake_file; 145237fead6SMichael Halcrow struct ecryptfs_file_info tmp_file_info; 146d7cdc5feSMichael Halcrow char zero_virt[] = { 0x00 }; 147d7cdc5feSMichael Halcrow int rc = 0; 148237fead6SMichael Halcrow 149237fead6SMichael Halcrow memset(&fake_file, 0, sizeof(fake_file)); 150bd243a4bSJosef "Jeff" Sipek fake_file.f_path.dentry = ecryptfs_dentry; 151237fead6SMichael Halcrow memset(&tmp_file_info, 0, sizeof(tmp_file_info)); 152237fead6SMichael Halcrow ecryptfs_set_file_private(&fake_file, &tmp_file_info); 153d7cdc5feSMichael Halcrow ecryptfs_set_file_lower( 154d7cdc5feSMichael Halcrow &fake_file, 155d7cdc5feSMichael Halcrow ecryptfs_inode_to_private(ecryptfs_inode)->lower_file); 156d7cdc5feSMichael Halcrow rc = ecryptfs_write(&fake_file, zero_virt, 0, 1); 157d7cdc5feSMichael Halcrow i_size_write(ecryptfs_inode, 0); 158d7cdc5feSMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); 159d7cdc5feSMichael Halcrow ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= 160d7cdc5feSMichael Halcrow ECRYPTFS_NEW_FILE; 161237fead6SMichael Halcrow return rc; 162237fead6SMichael Halcrow } 163237fead6SMichael Halcrow 164237fead6SMichael Halcrow /** 165237fead6SMichael Halcrow * ecryptfs_initialize_file 166237fead6SMichael Halcrow * 167237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 168237fead6SMichael Halcrow * file with a header and first data page. 169237fead6SMichael Halcrow * 170237fead6SMichael Halcrow * Returns zero on success 171237fead6SMichael Halcrow */ 172237fead6SMichael Halcrow static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) 173237fead6SMichael Halcrow { 174d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 175d7cdc5feSMichael Halcrow &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; 176237fead6SMichael Halcrow int rc = 0; 177237fead6SMichael Halcrow 178237fead6SMichael Halcrow if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { 179237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 180e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 181d7cdc5feSMichael Halcrow goto out; 182237fead6SMichael Halcrow } 183e2bd99ecSMichael Halcrow crypt_stat->flags |= ECRYPTFS_NEW_FILE; 184237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 185237fead6SMichael Halcrow rc = ecryptfs_new_file_context(ecryptfs_dentry); 186237fead6SMichael Halcrow if (rc) { 187d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 188d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 189d7cdc5feSMichael Halcrow goto out; 190237fead6SMichael Halcrow } 191391b52f9SMichael Halcrow if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { 192391b52f9SMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 193391b52f9SMichael Halcrow if (rc) { 194391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 195391b52f9SMichael Halcrow "the persistent file for the dentry with name " 196391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 197391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 198391b52f9SMichael Halcrow goto out; 199391b52f9SMichael Halcrow } 200391b52f9SMichael Halcrow } 201d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 202237fead6SMichael Halcrow if (rc) { 203d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 204d7cdc5feSMichael Halcrow goto out; 205237fead6SMichael Halcrow } 206d7cdc5feSMichael Halcrow rc = grow_file(ecryptfs_dentry); 2075dda6992SMichael Halcrow if (rc) 208d7cdc5feSMichael Halcrow printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); 209237fead6SMichael Halcrow out: 210237fead6SMichael Halcrow return rc; 211237fead6SMichael Halcrow } 212237fead6SMichael Halcrow 213237fead6SMichael Halcrow /** 214237fead6SMichael Halcrow * ecryptfs_create 215237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 216237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 217237fead6SMichael Halcrow * @mode: The mode of the new file. 218237fead6SMichael Halcrow * @nd: nameidata 219237fead6SMichael Halcrow * 220237fead6SMichael Halcrow * Creates a new file. 221237fead6SMichael Halcrow * 222237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 223237fead6SMichael Halcrow */ 224237fead6SMichael Halcrow static int 225237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 226237fead6SMichael Halcrow int mode, struct nameidata *nd) 227237fead6SMichael Halcrow { 228237fead6SMichael Halcrow int rc; 229237fead6SMichael Halcrow 230addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 231237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 232237fead6SMichael Halcrow if (unlikely(rc)) { 233237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 234237fead6SMichael Halcrow "lower filesystem\n"); 235237fead6SMichael Halcrow goto out; 236237fead6SMichael Halcrow } 237237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 238237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 239237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 240237fead6SMichael Halcrow out: 241237fead6SMichael Halcrow return rc; 242237fead6SMichael Halcrow } 243237fead6SMichael Halcrow 244237fead6SMichael Halcrow /** 245addd65adSMichael Halcrow * ecryptfs_lookup_and_interpose_lower - Perform a lookup 246237fead6SMichael Halcrow */ 247addd65adSMichael Halcrow int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, 248addd65adSMichael Halcrow struct dentry *lower_dentry, 249addd65adSMichael Halcrow struct inode *ecryptfs_dir_inode, 250addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 251237fead6SMichael Halcrow { 252237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 253237fead6SMichael Halcrow struct vfsmount *lower_mnt; 254addd65adSMichael Halcrow struct inode *lower_inode; 255e77a56ddSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 2562aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 257237fead6SMichael Halcrow char *page_virt = NULL; 258237fead6SMichael Halcrow u64 file_size; 259addd65adSMichael Halcrow int rc = 0; 260237fead6SMichael Halcrow 261addd65adSMichael Halcrow lower_dir_dentry = lower_dentry->d_parent; 262addd65adSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 263addd65adSMichael Halcrow ecryptfs_dentry->d_parent)); 264237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 265addd65adSMichael Halcrow fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); 266237fead6SMichael Halcrow BUG_ON(!atomic_read(&lower_dentry->d_count)); 267addd65adSMichael Halcrow ecryptfs_set_dentry_private(ecryptfs_dentry, 268237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 269e94b1766SChristoph Lameter GFP_KERNEL)); 270addd65adSMichael Halcrow if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { 271237fead6SMichael Halcrow rc = -ENOMEM; 272addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting " 273addd65adSMichael Halcrow "to allocate ecryptfs_dentry_info struct\n", 274addd65adSMichael Halcrow __func__); 275237fead6SMichael Halcrow goto out_dput; 276237fead6SMichael Halcrow } 277addd65adSMichael Halcrow ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); 278addd65adSMichael Halcrow ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); 279237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 280237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 281addd65adSMichael Halcrow d_add(ecryptfs_dentry, NULL); 282237fead6SMichael Halcrow goto out; 283237fead6SMichael Halcrow } 284addd65adSMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 2853469b573SErez Zadok ecryptfs_dir_inode->i_sb, 2863469b573SErez Zadok ECRYPTFS_INTERPOSE_FLAG_D_ADD); 287237fead6SMichael Halcrow if (rc) { 288addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 289addd65adSMichael Halcrow __func__, rc); 290391b52f9SMichael Halcrow goto out; 291237fead6SMichael Halcrow } 292addd65adSMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) 293237fead6SMichael Halcrow goto out; 294addd65adSMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) 295237fead6SMichael Halcrow goto out; 296addd65adSMichael Halcrow if (special_file(lower_inode->i_mode)) 297202a21d6SRyusuke Konishi goto out; 298addd65adSMichael Halcrow if (!ecryptfs_nd) 299237fead6SMichael Halcrow goto out; 300237fead6SMichael Halcrow /* Released in this function */ 301addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 302237fead6SMichael Halcrow if (!page_virt) { 303addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 304addd65adSMichael Halcrow __func__); 305237fead6SMichael Halcrow rc = -ENOMEM; 306391b52f9SMichael Halcrow goto out; 307237fead6SMichael Halcrow } 308addd65adSMichael Halcrow if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { 309addd65adSMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 310391b52f9SMichael Halcrow if (rc) { 311391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 312391b52f9SMichael Halcrow "the persistent file for the dentry with name " 313391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 314addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 315addd65adSMichael Halcrow goto out_free_kmem; 316391b52f9SMichael Halcrow } 317391b52f9SMichael Halcrow } 3182aac0cf8STyler Hicks crypt_stat = &ecryptfs_inode_to_private( 3192aac0cf8STyler Hicks ecryptfs_dentry->d_inode)->crypt_stat; 3202aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3212aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3222aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 323d7cdc5feSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, 324addd65adSMichael Halcrow ecryptfs_dentry->d_inode); 325237fead6SMichael Halcrow if (rc) { 326addd65adSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, 327addd65adSMichael Halcrow ecryptfs_dentry); 328dd2a3b7aSMichael Halcrow if (rc) { 329237fead6SMichael Halcrow rc = 0; 330addd65adSMichael Halcrow goto out_free_kmem; 331237fead6SMichael Halcrow } 332dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 333dd2a3b7aSMichael Halcrow } 334e77a56ddSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 335addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 336e77a56ddSMichael Halcrow if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { 337e77a56ddSMichael Halcrow if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 338cc11beffSMichael Halcrow file_size = (crypt_stat->num_header_bytes_at_front 339e77a56ddSMichael Halcrow + i_size_read(lower_dentry->d_inode)); 340e77a56ddSMichael Halcrow else 341e77a56ddSMichael Halcrow file_size = i_size_read(lower_dentry->d_inode); 342e77a56ddSMichael Halcrow } else { 3430a688ad7SHarvey Harrison file_size = get_unaligned_be64(page_virt); 344e77a56ddSMichael Halcrow } 345addd65adSMichael Halcrow i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); 346addd65adSMichael Halcrow out_free_kmem: 347237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 348237fead6SMichael Halcrow goto out; 349237fead6SMichael Halcrow out_dput: 350237fead6SMichael Halcrow dput(lower_dentry); 351addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 352237fead6SMichael Halcrow out: 353addd65adSMichael Halcrow return rc; 354addd65adSMichael Halcrow } 355addd65adSMichael Halcrow 356addd65adSMichael Halcrow /** 357addd65adSMichael Halcrow * ecryptfs_lookup 358addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 359addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 360addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 361addd65adSMichael Halcrow * 362addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 363addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 364addd65adSMichael Halcrow */ 365addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 366addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 367addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 368addd65adSMichael Halcrow { 369addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 370a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 371addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 372addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 373addd65adSMichael Halcrow int rc = 0; 374addd65adSMichael Halcrow 375addd65adSMichael Halcrow ecryptfs_dentry->d_op = &ecryptfs_dops; 376addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 377addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 378addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 379addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 380addd65adSMichael Halcrow goto out_d_drop; 381addd65adSMichael Halcrow } 382addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 383ca8e34f2STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 384addd65adSMichael Halcrow lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 385addd65adSMichael Halcrow lower_dir_dentry, 386addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 387ca8e34f2STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 388addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 389addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 390addd65adSMichael Halcrow printk(KERN_ERR "%s: lookup_one_len() returned [%d] on " 391addd65adSMichael Halcrow "lower_dentry = [%s]\n", __func__, rc, 392addd65adSMichael Halcrow ecryptfs_dentry->d_name.name); 393addd65adSMichael Halcrow goto out_d_drop; 394addd65adSMichael Halcrow } 395addd65adSMichael Halcrow if (lower_dentry->d_inode) 396addd65adSMichael Halcrow goto lookup_and_interpose; 397addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 398addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 3992aac0cf8STyler Hicks if (!(mount_crypt_stat 4002aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 401addd65adSMichael Halcrow goto lookup_and_interpose; 402addd65adSMichael Halcrow dput(lower_dentry); 403addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 404addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4052aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 406addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 407addd65adSMichael Halcrow if (rc) { 408addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 409addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 410addd65adSMichael Halcrow goto out_d_drop; 411addd65adSMichael Halcrow } 412ca8e34f2STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 413addd65adSMichael Halcrow lower_dentry = lookup_one_len(encrypted_and_encoded_name, 414addd65adSMichael Halcrow lower_dir_dentry, 415addd65adSMichael Halcrow encrypted_and_encoded_name_size - 1); 416ca8e34f2STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 417addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 418addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 419addd65adSMichael Halcrow printk(KERN_ERR "%s: lookup_one_len() returned [%d] on " 420addd65adSMichael Halcrow "lower_dentry = [%s]\n", __func__, rc, 421addd65adSMichael Halcrow encrypted_and_encoded_name); 422addd65adSMichael Halcrow goto out_d_drop; 423addd65adSMichael Halcrow } 424addd65adSMichael Halcrow lookup_and_interpose: 425addd65adSMichael Halcrow rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, 4262aac0cf8STyler Hicks ecryptfs_dir_inode, 427addd65adSMichael Halcrow ecryptfs_nd); 428addd65adSMichael Halcrow goto out; 429addd65adSMichael Halcrow out_d_drop: 430addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 431addd65adSMichael Halcrow out: 432addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 433237fead6SMichael Halcrow return ERR_PTR(rc); 434237fead6SMichael Halcrow } 435237fead6SMichael Halcrow 436237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 437237fead6SMichael Halcrow struct dentry *new_dentry) 438237fead6SMichael Halcrow { 439237fead6SMichael Halcrow struct dentry *lower_old_dentry; 440237fead6SMichael Halcrow struct dentry *lower_new_dentry; 441237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 442237fead6SMichael Halcrow u64 file_size_save; 443237fead6SMichael Halcrow int rc; 444237fead6SMichael Halcrow 445237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 446237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 447237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 448237fead6SMichael Halcrow dget(lower_old_dentry); 449237fead6SMichael Halcrow dget(lower_new_dentry); 450237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 451237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 452237fead6SMichael Halcrow lower_new_dentry); 453237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 454237fead6SMichael Halcrow goto out_lock; 455237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 456237fead6SMichael Halcrow if (rc) 457237fead6SMichael Halcrow goto out_lock; 4580cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); 4590cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); 460237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 461237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 462237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 463237fead6SMichael Halcrow out_lock: 464237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 465237fead6SMichael Halcrow dput(lower_new_dentry); 466237fead6SMichael Halcrow dput(lower_old_dentry); 467237fead6SMichael Halcrow return rc; 468237fead6SMichael Halcrow } 469237fead6SMichael Halcrow 470237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 471237fead6SMichael Halcrow { 472237fead6SMichael Halcrow int rc = 0; 473237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 474237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 4758dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 476237fead6SMichael Halcrow 4779c2d2056STyler Hicks dget(lower_dentry); 4788dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 479237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 480237fead6SMichael Halcrow if (rc) { 481ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 482237fead6SMichael Halcrow goto out_unlock; 483237fead6SMichael Halcrow } 4840cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 485237fead6SMichael Halcrow dentry->d_inode->i_nlink = 486237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 487237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 488caeeeecfSMichael Halcrow d_drop(dentry); 489237fead6SMichael Halcrow out_unlock: 4908dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 4919c2d2056STyler Hicks dput(lower_dentry); 492237fead6SMichael Halcrow return rc; 493237fead6SMichael Halcrow } 494237fead6SMichael Halcrow 495237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 496237fead6SMichael Halcrow const char *symname) 497237fead6SMichael Halcrow { 498237fead6SMichael Halcrow int rc; 499237fead6SMichael Halcrow struct dentry *lower_dentry; 500237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 501237fead6SMichael Halcrow char *encoded_symname; 502addd65adSMichael Halcrow size_t encoded_symlen; 503addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 504237fead6SMichael Halcrow 505237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 506237fead6SMichael Halcrow dget(lower_dentry); 507237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 508addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 509addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 510addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 511addd65adSMichael Halcrow &encoded_symlen, 512addd65adSMichael Halcrow NULL, 513addd65adSMichael Halcrow mount_crypt_stat, symname, 514addd65adSMichael Halcrow strlen(symname)); 515addd65adSMichael Halcrow if (rc) 516237fead6SMichael Halcrow goto out_lock; 517237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 518db2e747bSMiklos Szeredi encoded_symname); 519237fead6SMichael Halcrow kfree(encoded_symname); 520237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 521237fead6SMichael Halcrow goto out_lock; 522237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 523237fead6SMichael Halcrow if (rc) 524237fead6SMichael Halcrow goto out_lock; 5250cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5260cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 527237fead6SMichael Halcrow out_lock: 528237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 529237fead6SMichael Halcrow dput(lower_dentry); 530237fead6SMichael Halcrow if (!dentry->d_inode) 531237fead6SMichael Halcrow d_drop(dentry); 532237fead6SMichael Halcrow return rc; 533237fead6SMichael Halcrow } 534237fead6SMichael Halcrow 535237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 536237fead6SMichael Halcrow { 537237fead6SMichael Halcrow int rc; 538237fead6SMichael Halcrow struct dentry *lower_dentry; 539237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 540237fead6SMichael Halcrow 541237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 542237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 543237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 544237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 545237fead6SMichael Halcrow goto out; 546237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 547237fead6SMichael Halcrow if (rc) 548237fead6SMichael Halcrow goto out; 5490cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5500cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 551237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 552237fead6SMichael Halcrow out: 553237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 554237fead6SMichael Halcrow if (!dentry->d_inode) 555237fead6SMichael Halcrow d_drop(dentry); 556237fead6SMichael Halcrow return rc; 557237fead6SMichael Halcrow } 558237fead6SMichael Halcrow 559237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 560237fead6SMichael Halcrow { 561237fead6SMichael Halcrow struct dentry *lower_dentry; 562237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 56345ec4abaSMichael Halcrow int rc; 564237fead6SMichael Halcrow 565237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 56645ec4abaSMichael Halcrow dget(dentry); 567237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 56845ec4abaSMichael Halcrow dget(lower_dentry); 569237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 57045ec4abaSMichael Halcrow dput(lower_dentry); 57145ec4abaSMichael Halcrow if (!rc) 57245ec4abaSMichael Halcrow d_delete(lower_dentry); 5730cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 574237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 575237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 576237fead6SMichael Halcrow if (!rc) 577237fead6SMichael Halcrow d_drop(dentry); 57845ec4abaSMichael Halcrow dput(dentry); 579237fead6SMichael Halcrow return rc; 580237fead6SMichael Halcrow } 581237fead6SMichael Halcrow 582237fead6SMichael Halcrow static int 583237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 584237fead6SMichael Halcrow { 585237fead6SMichael Halcrow int rc; 586237fead6SMichael Halcrow struct dentry *lower_dentry; 587237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 588237fead6SMichael Halcrow 589237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 590237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 591237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 592237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 593237fead6SMichael Halcrow goto out; 594391b52f9SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 595237fead6SMichael Halcrow if (rc) 596237fead6SMichael Halcrow goto out; 5970cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5980cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 599237fead6SMichael Halcrow out: 600237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 601237fead6SMichael Halcrow if (!dentry->d_inode) 602237fead6SMichael Halcrow d_drop(dentry); 603237fead6SMichael Halcrow return rc; 604237fead6SMichael Halcrow } 605237fead6SMichael Halcrow 606237fead6SMichael Halcrow static int 607237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 608237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 609237fead6SMichael Halcrow { 610237fead6SMichael Halcrow int rc; 611237fead6SMichael Halcrow struct dentry *lower_old_dentry; 612237fead6SMichael Halcrow struct dentry *lower_new_dentry; 613237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 614237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6150d132f73SErez Zadok struct dentry *trap = NULL; 616237fead6SMichael Halcrow 617237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 618237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 619237fead6SMichael Halcrow dget(lower_old_dentry); 620237fead6SMichael Halcrow dget(lower_new_dentry); 621237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 622237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6230d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6240d132f73SErez Zadok /* source should not be ancestor of target */ 6250d132f73SErez Zadok if (trap == lower_old_dentry) { 6260d132f73SErez Zadok rc = -EINVAL; 6270d132f73SErez Zadok goto out_lock; 6280d132f73SErez Zadok } 6290d132f73SErez Zadok /* target should not be ancestor of source */ 6300d132f73SErez Zadok if (trap == lower_new_dentry) { 6310d132f73SErez Zadok rc = -ENOTEMPTY; 6320d132f73SErez Zadok goto out_lock; 6330d132f73SErez Zadok } 634237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 635237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 636237fead6SMichael Halcrow if (rc) 637237fead6SMichael Halcrow goto out_lock; 6389afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 639237fead6SMichael Halcrow if (new_dir != old_dir) 6409afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 641237fead6SMichael Halcrow out_lock: 642237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 643a9083081SMichael Halcrow dput(lower_new_dentry->d_parent); 644a9083081SMichael Halcrow dput(lower_old_dentry->d_parent); 645237fead6SMichael Halcrow dput(lower_new_dentry); 646237fead6SMichael Halcrow dput(lower_old_dentry); 647237fead6SMichael Halcrow return rc; 648237fead6SMichael Halcrow } 649237fead6SMichael Halcrow 650237fead6SMichael Halcrow static int 651237fead6SMichael Halcrow ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 652237fead6SMichael Halcrow { 653237fead6SMichael Halcrow char *lower_buf; 6543a6b42caSTyler Hicks size_t lower_bufsiz; 655addd65adSMichael Halcrow struct dentry *lower_dentry; 6563a6b42caSTyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 657addd65adSMichael Halcrow char *plaintext_name; 658addd65adSMichael Halcrow size_t plaintext_name_size; 659addd65adSMichael Halcrow mm_segment_t old_fs; 660addd65adSMichael Halcrow int rc; 661237fead6SMichael Halcrow 662237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 663acfa4380SAl Viro if (!lower_dentry->d_inode->i_op->readlink) { 664237fead6SMichael Halcrow rc = -EINVAL; 665237fead6SMichael Halcrow goto out; 666237fead6SMichael Halcrow } 6673a6b42caSTyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 6683a6b42caSTyler Hicks dentry->d_sb)->mount_crypt_stat; 6693a6b42caSTyler Hicks /* 6703a6b42caSTyler Hicks * If the lower filename is encrypted, it will result in a significantly 6713a6b42caSTyler Hicks * longer name. If needed, truncate the name after decode and decrypt. 6723a6b42caSTyler Hicks */ 6733a6b42caSTyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) 6743a6b42caSTyler Hicks lower_bufsiz = PATH_MAX; 6753a6b42caSTyler Hicks else 6763a6b42caSTyler Hicks lower_bufsiz = bufsiz; 677237fead6SMichael Halcrow /* Released in this function */ 6783a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 679237fead6SMichael Halcrow if (lower_buf == NULL) { 680addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting to " 681802b352fSRandy Dunlap "kmalloc [%zd] bytes\n", __func__, lower_bufsiz); 682237fead6SMichael Halcrow rc = -ENOMEM; 683237fead6SMichael Halcrow goto out; 684237fead6SMichael Halcrow } 685237fead6SMichael Halcrow old_fs = get_fs(); 686237fead6SMichael Halcrow set_fs(get_ds()); 687237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 688237fead6SMichael Halcrow (char __user *)lower_buf, 6893a6b42caSTyler Hicks lower_bufsiz); 690237fead6SMichael Halcrow set_fs(old_fs); 691237fead6SMichael Halcrow if (rc >= 0) { 692addd65adSMichael Halcrow rc = ecryptfs_decode_and_decrypt_filename(&plaintext_name, 693addd65adSMichael Halcrow &plaintext_name_size, 694addd65adSMichael Halcrow dentry, lower_buf, 695addd65adSMichael Halcrow rc); 696addd65adSMichael Halcrow if (rc) { 697addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to decode and " 698addd65adSMichael Halcrow "decrypt filename; rc = [%d]\n", __func__, 699addd65adSMichael Halcrow rc); 700237fead6SMichael Halcrow goto out_free_lower_buf; 701237fead6SMichael Halcrow } 7023a6b42caSTyler Hicks /* Check for bufsiz <= 0 done in sys_readlinkat() */ 7033a6b42caSTyler Hicks rc = copy_to_user(buf, plaintext_name, 704ac20100dSTyler Hicks min((size_t) bufsiz, plaintext_name_size)); 705addd65adSMichael Halcrow if (rc) 706addd65adSMichael Halcrow rc = -EFAULT; 707addd65adSMichael Halcrow else 708addd65adSMichael Halcrow rc = plaintext_name_size; 709addd65adSMichael Halcrow kfree(plaintext_name); 710addd65adSMichael Halcrow fsstack_copy_attr_atime(dentry->d_inode, lower_dentry->d_inode); 711237fead6SMichael Halcrow } 712237fead6SMichael Halcrow out_free_lower_buf: 713237fead6SMichael Halcrow kfree(lower_buf); 714237fead6SMichael Halcrow out: 715237fead6SMichael Halcrow return rc; 716237fead6SMichael Halcrow } 717237fead6SMichael Halcrow 718237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 719237fead6SMichael Halcrow { 720237fead6SMichael Halcrow char *buf; 721237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 722237fead6SMichael Halcrow mm_segment_t old_fs; 723237fead6SMichael Halcrow 724237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 725237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 726237fead6SMichael Halcrow if (!buf) { 727806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 728237fead6SMichael Halcrow goto out; 729237fead6SMichael Halcrow } 730237fead6SMichael Halcrow old_fs = get_fs(); 731237fead6SMichael Halcrow set_fs(get_ds()); 732237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 733237fead6SMichael Halcrow set_fs(old_fs); 734806892e9SOGAWA Hirofumi if (rc < 0) { 735237fead6SMichael Halcrow kfree(buf); 736806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 737806892e9SOGAWA Hirofumi } else 738806892e9SOGAWA Hirofumi buf[rc] = '\0'; 739237fead6SMichael Halcrow out: 740806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 741806892e9SOGAWA Hirofumi return NULL; 742237fead6SMichael Halcrow } 743237fead6SMichael Halcrow 744237fead6SMichael Halcrow static void 745237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 746237fead6SMichael Halcrow { 747806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 748806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 749237fead6SMichael Halcrow /* Free the char* */ 750806892e9SOGAWA Hirofumi kfree(buf); 751806892e9SOGAWA Hirofumi } 752237fead6SMichael Halcrow } 753237fead6SMichael Halcrow 754237fead6SMichael Halcrow /** 755237fead6SMichael Halcrow * upper_size_to_lower_size 756237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 757237fead6SMichael Halcrow * @upper_size: Size of the upper file 758237fead6SMichael Halcrow * 759cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 760237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 761237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 762237fead6SMichael Halcrow * 763237fead6SMichael Halcrow * Returns Calculated size of the lower file. 764237fead6SMichael Halcrow */ 765237fead6SMichael Halcrow static loff_t 766237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 767237fead6SMichael Halcrow loff_t upper_size) 768237fead6SMichael Halcrow { 769237fead6SMichael Halcrow loff_t lower_size; 770237fead6SMichael Halcrow 771157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 772237fead6SMichael Halcrow if (upper_size != 0) { 773237fead6SMichael Halcrow loff_t num_extents; 774237fead6SMichael Halcrow 775237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 776237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 777237fead6SMichael Halcrow num_extents++; 778237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 779237fead6SMichael Halcrow } 780237fead6SMichael Halcrow return lower_size; 781237fead6SMichael Halcrow } 782237fead6SMichael Halcrow 783237fead6SMichael Halcrow /** 7845f3ef64fSTyler Hicks * truncate_upper 785237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7865f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7875f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 788237fead6SMichael Halcrow * 789237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 790237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7915f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7925f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7935f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7945f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7955f3ef64fSTyler Hicks * the truncation of the lower inode. 796237fead6SMichael Halcrow * 797237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 798237fead6SMichael Halcrow */ 7995f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 8005f3ef64fSTyler Hicks struct iattr *lower_ia) 801237fead6SMichael Halcrow { 802237fead6SMichael Halcrow int rc = 0; 803237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 804237fead6SMichael Halcrow struct dentry *lower_dentry; 8052ed92554SMichael Halcrow struct file fake_ecryptfs_file; 806237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 807237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 808237fead6SMichael Halcrow loff_t lower_size_before_truncate; 809237fead6SMichael Halcrow loff_t lower_size_after_truncate; 810237fead6SMichael Halcrow 8115f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 8125f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 813237fead6SMichael Halcrow goto out; 8145f3ef64fSTyler Hicks } 815237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 816237fead6SMichael Halcrow /* Set up a fake ecryptfs file, this is used to interface with 817237fead6SMichael Halcrow * the file in the underlying filesystem so that the 818237fead6SMichael Halcrow * truncation has an effect there as well. */ 819237fead6SMichael Halcrow memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); 820bd243a4bSJosef "Jeff" Sipek fake_ecryptfs_file.f_path.dentry = dentry; 821237fead6SMichael Halcrow /* Released at out_free: label */ 822237fead6SMichael Halcrow ecryptfs_set_file_private(&fake_ecryptfs_file, 823237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_file_info_cache, 824e94b1766SChristoph Lameter GFP_KERNEL)); 825237fead6SMichael Halcrow if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { 826237fead6SMichael Halcrow rc = -ENOMEM; 827237fead6SMichael Halcrow goto out; 828237fead6SMichael Halcrow } 829237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 8302ed92554SMichael Halcrow ecryptfs_set_file_lower( 8312ed92554SMichael Halcrow &fake_ecryptfs_file, 8322ed92554SMichael Halcrow ecryptfs_inode_to_private(dentry->d_inode)->lower_file); 833237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 8345f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 8352ed92554SMichael Halcrow char zero[] = { 0x00 }; 836240e2df5SMichael Halcrow 8375f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 8382ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 8392ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 8402ed92554SMichael Halcrow * the intermediate portion of the previous end of the 8412ed92554SMichael Halcrow * file and the new and of the file */ 8422ed92554SMichael Halcrow rc = ecryptfs_write(&fake_ecryptfs_file, zero, 8435f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 8445f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 8455f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 8465f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 8475f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8482ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8492ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8505f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8512ed92554SMichael Halcrow 85213a791b4STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8535f3ef64fSTyler Hicks rc = vmtruncate(inode, ia->ia_size); 85413a791b4STyler Hicks if (rc) 85513a791b4STyler Hicks goto out_free; 8565f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8575f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 85813a791b4STyler Hicks goto out_free; 85913a791b4STyler Hicks } 8602ed92554SMichael Halcrow if (num_zeros) { 8612ed92554SMichael Halcrow char *zeros_virt; 8622ed92554SMichael Halcrow 8632ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8642ed92554SMichael Halcrow if (!zeros_virt) { 8652ed92554SMichael Halcrow rc = -ENOMEM; 8662ed92554SMichael Halcrow goto out_free; 867240e2df5SMichael Halcrow } 8682ed92554SMichael Halcrow rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt, 8695f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8702ed92554SMichael Halcrow kfree(zeros_virt); 8715dda6992SMichael Halcrow if (rc) { 872240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 873240e2df5SMichael Halcrow "the remainder of the end page on " 874240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 8752ed92554SMichael Halcrow goto out_free; 876240e2df5SMichael Halcrow } 877240e2df5SMichael Halcrow } 8785f3ef64fSTyler Hicks vmtruncate(inode, ia->ia_size); 8790216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 880dd2a3b7aSMichael Halcrow if (rc) { 881dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 882dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 883dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 8842ed92554SMichael Halcrow goto out_free; 885dd2a3b7aSMichael Halcrow } 886237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 887237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 888237fead6SMichael Halcrow lower_size_before_truncate = 889237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 890237fead6SMichael Halcrow lower_size_after_truncate = 8915f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8925f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8935f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8945f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8955f3ef64fSTyler Hicks } else 8965f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 897237fead6SMichael Halcrow } 898237fead6SMichael Halcrow out_free: 899237fead6SMichael Halcrow if (ecryptfs_file_to_private(&fake_ecryptfs_file)) 900237fead6SMichael Halcrow kmem_cache_free(ecryptfs_file_info_cache, 901237fead6SMichael Halcrow ecryptfs_file_to_private(&fake_ecryptfs_file)); 902237fead6SMichael Halcrow out: 903237fead6SMichael Halcrow return rc; 904237fead6SMichael Halcrow } 905237fead6SMichael Halcrow 9065f3ef64fSTyler Hicks /** 9075f3ef64fSTyler Hicks * ecryptfs_truncate 9085f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 9095f3ef64fSTyler Hicks * @new_length: The length to expand the file to 9105f3ef64fSTyler Hicks * 9115f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 9125f3ef64fSTyler Hicks * its corresponding lower inode. 9135f3ef64fSTyler Hicks * 9145f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 9155f3ef64fSTyler Hicks */ 9165f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 9175f3ef64fSTyler Hicks { 9185f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 9195f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 9205f3ef64fSTyler Hicks int rc; 9215f3ef64fSTyler Hicks 9225f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 9235f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 9245f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 9255f3ef64fSTyler Hicks 9265f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 9275f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9285f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 9295f3ef64fSTyler Hicks } 9305f3ef64fSTyler Hicks return rc; 9315f3ef64fSTyler Hicks } 9325f3ef64fSTyler Hicks 933237fead6SMichael Halcrow static int 934e6305c43SAl Viro ecryptfs_permission(struct inode *inode, int mask) 935237fead6SMichael Halcrow { 936f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 937237fead6SMichael Halcrow } 938237fead6SMichael Halcrow 939237fead6SMichael Halcrow /** 940237fead6SMichael Halcrow * ecryptfs_setattr 941237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 942237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 943237fead6SMichael Halcrow * 944237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 945237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 946237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 947237fead6SMichael Halcrow * 948237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 949237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 950237fead6SMichael Halcrow */ 951237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 952237fead6SMichael Halcrow { 953237fead6SMichael Halcrow int rc = 0; 954237fead6SMichael Halcrow struct dentry *lower_dentry; 9555f3ef64fSTyler Hicks struct iattr lower_ia; 956237fead6SMichael Halcrow struct inode *inode; 957237fead6SMichael Halcrow struct inode *lower_inode; 958237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 959237fead6SMichael Halcrow 960237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 961e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 962e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 963237fead6SMichael Halcrow inode = dentry->d_inode; 964237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 965e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 966e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 967e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 968e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 96964ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 97064ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 97164ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 972e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 973e10f281bSMichael Halcrow 974e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 975e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 976d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 9775dda6992SMichael Halcrow if (rc) { 978e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 979e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 980e10f281bSMichael Halcrow rc = -EIO; 98125bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 982e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 98325bd8174SMichael Halcrow "or the key could not be retrieved. " 98425bd8174SMichael Halcrow "Plaintext passthrough mode is not " 985e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 986e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 987e10f281bSMichael Halcrow goto out; 988e10f281bSMichael Halcrow } 989e10f281bSMichael Halcrow rc = 0; 990e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 991e10f281bSMichael Halcrow } 992e10f281bSMichael Halcrow } 993e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 9945f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9955f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9965f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 997237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9985f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 999237fead6SMichael Halcrow if (rc < 0) 1000237fead6SMichael Halcrow goto out; 1001237fead6SMichael Halcrow } 10021ac564ecSJeff Layton 10031ac564ecSJeff Layton /* 10041ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 10051ac564ecSJeff Layton * to interpret this in its own way. 10061ac564ecSJeff Layton */ 10075f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 10085f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 10091ac564ecSJeff Layton 10109c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 10115f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 10129c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 1013237fead6SMichael Halcrow out: 10149afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 1015237fead6SMichael Halcrow return rc; 1016237fead6SMichael Halcrow } 1017237fead6SMichael Halcrow 1018f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1019f8f484d1STyler Hicks struct kstat *stat) 1020f8f484d1STyler Hicks { 1021f8f484d1STyler Hicks struct kstat lower_stat; 1022f8f484d1STyler Hicks int rc; 1023f8f484d1STyler Hicks 1024f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1025f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1026f8f484d1STyler Hicks if (!rc) { 1027f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1028f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1029f8f484d1STyler Hicks } 1030f8f484d1STyler Hicks return rc; 1031f8f484d1STyler Hicks } 1032f8f484d1STyler Hicks 1033dd2a3b7aSMichael Halcrow int 1034237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1035237fead6SMichael Halcrow size_t size, int flags) 1036237fead6SMichael Halcrow { 1037237fead6SMichael Halcrow int rc = 0; 1038237fead6SMichael Halcrow struct dentry *lower_dentry; 1039237fead6SMichael Halcrow 1040237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1041237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1042237fead6SMichael Halcrow rc = -ENOSYS; 1043237fead6SMichael Halcrow goto out; 1044237fead6SMichael Halcrow } 1045237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1046237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, 1047237fead6SMichael Halcrow size, flags); 1048237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1049237fead6SMichael Halcrow out: 1050237fead6SMichael Halcrow return rc; 1051237fead6SMichael Halcrow } 1052237fead6SMichael Halcrow 1053dd2a3b7aSMichael Halcrow ssize_t 1054d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1055d7cdc5feSMichael Halcrow void *value, size_t size) 1056d7cdc5feSMichael Halcrow { 1057d7cdc5feSMichael Halcrow int rc = 0; 1058d7cdc5feSMichael Halcrow 1059d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1060d7cdc5feSMichael Halcrow rc = -ENOSYS; 1061d7cdc5feSMichael Halcrow goto out; 1062d7cdc5feSMichael Halcrow } 1063d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1064d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1065d7cdc5feSMichael Halcrow size); 1066d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1067d7cdc5feSMichael Halcrow out: 1068d7cdc5feSMichael Halcrow return rc; 1069d7cdc5feSMichael Halcrow } 1070d7cdc5feSMichael Halcrow 10717896b631SAdrian Bunk static ssize_t 1072237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1073237fead6SMichael Halcrow size_t size) 1074237fead6SMichael Halcrow { 10752ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10762ed92554SMichael Halcrow value, size); 1077237fead6SMichael Halcrow } 1078237fead6SMichael Halcrow 1079237fead6SMichael Halcrow static ssize_t 1080237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1081237fead6SMichael Halcrow { 1082237fead6SMichael Halcrow int rc = 0; 1083237fead6SMichael Halcrow struct dentry *lower_dentry; 1084237fead6SMichael Halcrow 1085237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1086237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1087237fead6SMichael Halcrow rc = -ENOSYS; 1088237fead6SMichael Halcrow goto out; 1089237fead6SMichael Halcrow } 1090237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1091237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1092237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1093237fead6SMichael Halcrow out: 1094237fead6SMichael Halcrow return rc; 1095237fead6SMichael Halcrow } 1096237fead6SMichael Halcrow 1097237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1098237fead6SMichael Halcrow { 1099237fead6SMichael Halcrow int rc = 0; 1100237fead6SMichael Halcrow struct dentry *lower_dentry; 1101237fead6SMichael Halcrow 1102237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1103237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1104237fead6SMichael Halcrow rc = -ENOSYS; 1105237fead6SMichael Halcrow goto out; 1106237fead6SMichael Halcrow } 1107237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1108237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1109237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1110237fead6SMichael Halcrow out: 1111237fead6SMichael Halcrow return rc; 1112237fead6SMichael Halcrow } 1113237fead6SMichael Halcrow 1114237fead6SMichael Halcrow int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) 1115237fead6SMichael Halcrow { 1116237fead6SMichael Halcrow if ((ecryptfs_inode_to_lower(inode) 1117237fead6SMichael Halcrow == (struct inode *)candidate_lower_inode)) 1118237fead6SMichael Halcrow return 1; 1119237fead6SMichael Halcrow else 1120237fead6SMichael Halcrow return 0; 1121237fead6SMichael Halcrow } 1122237fead6SMichael Halcrow 1123237fead6SMichael Halcrow int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 1124237fead6SMichael Halcrow { 1125237fead6SMichael Halcrow ecryptfs_init_inode(inode, (struct inode *)lower_inode); 1126237fead6SMichael Halcrow return 0; 1127237fead6SMichael Halcrow } 1128237fead6SMichael Halcrow 1129754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1130237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1131237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1132237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1133237fead6SMichael Halcrow .permission = ecryptfs_permission, 1134237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1135237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1136237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1137237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1138237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1139237fead6SMichael Halcrow }; 1140237fead6SMichael Halcrow 1141754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1142237fead6SMichael Halcrow .create = ecryptfs_create, 1143237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1144237fead6SMichael Halcrow .link = ecryptfs_link, 1145237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1146237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1147237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1148237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1149237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1150237fead6SMichael Halcrow .rename = ecryptfs_rename, 1151237fead6SMichael Halcrow .permission = ecryptfs_permission, 1152237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1153237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1154237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1155237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1156237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1157237fead6SMichael Halcrow }; 1158237fead6SMichael Halcrow 1159754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1160237fead6SMichael Halcrow .permission = ecryptfs_permission, 1161237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1162f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1163237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1164237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1165237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1166237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1167237fead6SMichael Halcrow }; 1168