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> 34237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 35237fead6SMichael Halcrow 36237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 37237fead6SMichael Halcrow { 38237fead6SMichael Halcrow struct dentry *dir; 39237fead6SMichael Halcrow 40237fead6SMichael Halcrow dir = dget(dentry->d_parent); 41908e0a8aSPeter Zijlstra mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); 42237fead6SMichael Halcrow return dir; 43237fead6SMichael Halcrow } 44237fead6SMichael Halcrow 45237fead6SMichael Halcrow static void unlock_parent(struct dentry *dentry) 46237fead6SMichael Halcrow { 47237fead6SMichael Halcrow mutex_unlock(&(dentry->d_parent->d_inode->i_mutex)); 48237fead6SMichael Halcrow dput(dentry->d_parent); 49237fead6SMichael Halcrow } 50237fead6SMichael Halcrow 51237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 52237fead6SMichael Halcrow { 53237fead6SMichael Halcrow mutex_unlock(&dir->d_inode->i_mutex); 54237fead6SMichael Halcrow dput(dir); 55237fead6SMichael Halcrow } 56237fead6SMichael Halcrow 57237fead6SMichael Halcrow /** 58237fead6SMichael Halcrow * ecryptfs_create_underlying_file 59237fead6SMichael Halcrow * @lower_dir_inode: inode of the parent in the lower fs of the new file 60237fead6SMichael Halcrow * @lower_dentry: New file's dentry in the lower fs 61237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 62237fead6SMichael Halcrow * @mode: The mode of the new file 63237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 64237fead6SMichael Halcrow * 65237fead6SMichael Halcrow * Creates the file in the lower file system. 66237fead6SMichael Halcrow * 67237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 68237fead6SMichael Halcrow */ 69237fead6SMichael Halcrow static int 70237fead6SMichael Halcrow ecryptfs_create_underlying_file(struct inode *lower_dir_inode, 71237fead6SMichael Halcrow struct dentry *dentry, int mode, 72237fead6SMichael Halcrow struct nameidata *nd) 73237fead6SMichael Halcrow { 74237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 75237fead6SMichael Halcrow struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); 76237fead6SMichael Halcrow struct dentry *dentry_save; 77237fead6SMichael Halcrow struct vfsmount *vfsmount_save; 78237fead6SMichael Halcrow int rc; 79237fead6SMichael Halcrow 80237fead6SMichael Halcrow dentry_save = nd->dentry; 81237fead6SMichael Halcrow vfsmount_save = nd->mnt; 82237fead6SMichael Halcrow nd->dentry = lower_dentry; 83237fead6SMichael Halcrow nd->mnt = lower_mnt; 84237fead6SMichael Halcrow rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); 85237fead6SMichael Halcrow nd->dentry = dentry_save; 86237fead6SMichael Halcrow nd->mnt = vfsmount_save; 87237fead6SMichael Halcrow return rc; 88237fead6SMichael Halcrow } 89237fead6SMichael Halcrow 90237fead6SMichael Halcrow /** 91237fead6SMichael Halcrow * ecryptfs_do_create 92237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 93237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 94237fead6SMichael Halcrow * @mode: The mode of the new file 95237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 96237fead6SMichael Halcrow * 97237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 98237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 99237fead6SMichael Halcrow * stat of the lower directory inode. 100237fead6SMichael Halcrow * 101237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 102237fead6SMichael Halcrow */ 103237fead6SMichael Halcrow static int 104237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 105237fead6SMichael Halcrow struct dentry *ecryptfs_dentry, int mode, 106237fead6SMichael Halcrow struct nameidata *nd) 107237fead6SMichael Halcrow { 108237fead6SMichael Halcrow int rc; 109237fead6SMichael Halcrow struct dentry *lower_dentry; 110237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 111237fead6SMichael Halcrow 112237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 113237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 114237fead6SMichael Halcrow if (unlikely(IS_ERR(lower_dir_dentry))) { 115237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 116237fead6SMichael Halcrow "dentry\n"); 117237fead6SMichael Halcrow rc = PTR_ERR(lower_dir_dentry); 118237fead6SMichael Halcrow goto out; 119237fead6SMichael Halcrow } 120237fead6SMichael Halcrow rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, 121237fead6SMichael Halcrow ecryptfs_dentry, mode, nd); 1224981e081SMichael Halcrow if (rc) { 123caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 124caeeeecfSMichael Halcrow "rc = [%d]\n", __FUNCTION__, rc); 125237fead6SMichael Halcrow goto out_lock; 126237fead6SMichael Halcrow } 127237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 128237fead6SMichael Halcrow directory_inode->i_sb, 0); 129237fead6SMichael Halcrow if (rc) { 130237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); 131237fead6SMichael Halcrow goto out_lock; 132237fead6SMichael Halcrow } 1330cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 1340cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 135237fead6SMichael Halcrow out_lock: 136237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 137237fead6SMichael Halcrow out: 138237fead6SMichael Halcrow return rc; 139237fead6SMichael Halcrow } 140237fead6SMichael Halcrow 141237fead6SMichael Halcrow /** 142237fead6SMichael Halcrow * grow_file 143d7cdc5feSMichael Halcrow * @ecryptfs_dentry: the eCryptfs dentry 144237fead6SMichael Halcrow * 145237fead6SMichael Halcrow * This is the code which will grow the file to its correct size. 146237fead6SMichael Halcrow */ 147d7cdc5feSMichael Halcrow static int grow_file(struct dentry *ecryptfs_dentry) 148237fead6SMichael Halcrow { 149d7cdc5feSMichael Halcrow struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; 150237fead6SMichael Halcrow struct file fake_file; 151237fead6SMichael Halcrow struct ecryptfs_file_info tmp_file_info; 152d7cdc5feSMichael Halcrow char zero_virt[] = { 0x00 }; 153d7cdc5feSMichael Halcrow int rc = 0; 154237fead6SMichael Halcrow 155237fead6SMichael Halcrow memset(&fake_file, 0, sizeof(fake_file)); 156bd243a4bSJosef "Jeff" Sipek fake_file.f_path.dentry = ecryptfs_dentry; 157237fead6SMichael Halcrow memset(&tmp_file_info, 0, sizeof(tmp_file_info)); 158237fead6SMichael Halcrow ecryptfs_set_file_private(&fake_file, &tmp_file_info); 159d7cdc5feSMichael Halcrow ecryptfs_set_file_lower( 160d7cdc5feSMichael Halcrow &fake_file, 161d7cdc5feSMichael Halcrow ecryptfs_inode_to_private(ecryptfs_inode)->lower_file); 162d7cdc5feSMichael Halcrow rc = ecryptfs_write(&fake_file, zero_virt, 0, 1); 163d7cdc5feSMichael Halcrow i_size_write(ecryptfs_inode, 0); 164d7cdc5feSMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); 165d7cdc5feSMichael Halcrow ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= 166d7cdc5feSMichael Halcrow ECRYPTFS_NEW_FILE; 167237fead6SMichael Halcrow return rc; 168237fead6SMichael Halcrow } 169237fead6SMichael Halcrow 170237fead6SMichael Halcrow /** 171237fead6SMichael Halcrow * ecryptfs_initialize_file 172237fead6SMichael Halcrow * 173237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 174237fead6SMichael Halcrow * file with a header and first data page. 175237fead6SMichael Halcrow * 176237fead6SMichael Halcrow * Returns zero on success 177237fead6SMichael Halcrow */ 178237fead6SMichael Halcrow static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) 179237fead6SMichael Halcrow { 180d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 181d7cdc5feSMichael Halcrow &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; 182237fead6SMichael Halcrow int rc = 0; 183237fead6SMichael Halcrow 184237fead6SMichael Halcrow if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { 185237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 186e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 187d7cdc5feSMichael Halcrow goto out; 188237fead6SMichael Halcrow } 189e2bd99ecSMichael Halcrow crypt_stat->flags |= ECRYPTFS_NEW_FILE; 190237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 191237fead6SMichael Halcrow rc = ecryptfs_new_file_context(ecryptfs_dentry); 192237fead6SMichael Halcrow if (rc) { 193d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 194d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 195d7cdc5feSMichael Halcrow goto out; 196237fead6SMichael Halcrow } 197d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 198237fead6SMichael Halcrow if (rc) { 199d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 200d7cdc5feSMichael Halcrow goto out; 201237fead6SMichael Halcrow } 202d7cdc5feSMichael Halcrow rc = grow_file(ecryptfs_dentry); 2035dda6992SMichael Halcrow if (rc) 204d7cdc5feSMichael Halcrow printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); 205237fead6SMichael Halcrow out: 206237fead6SMichael Halcrow return rc; 207237fead6SMichael Halcrow } 208237fead6SMichael Halcrow 209237fead6SMichael Halcrow /** 210237fead6SMichael Halcrow * ecryptfs_create 211237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 212237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 213237fead6SMichael Halcrow * @mode: The mode of the new file. 214237fead6SMichael Halcrow * @nd: nameidata 215237fead6SMichael Halcrow * 216237fead6SMichael Halcrow * Creates a new file. 217237fead6SMichael Halcrow * 218237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 219237fead6SMichael Halcrow */ 220237fead6SMichael Halcrow static int 221237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 222237fead6SMichael Halcrow int mode, struct nameidata *nd) 223237fead6SMichael Halcrow { 224237fead6SMichael Halcrow int rc; 225237fead6SMichael Halcrow 2264981e081SMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose(), which opens 2274981e081SMichael Halcrow * the crypt_stat->lower_file (persistent file) */ 228237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 229237fead6SMichael Halcrow if (unlikely(rc)) { 230237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 231237fead6SMichael Halcrow "lower filesystem\n"); 232237fead6SMichael Halcrow goto out; 233237fead6SMichael Halcrow } 234237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 235237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 236237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 237237fead6SMichael Halcrow out: 238237fead6SMichael Halcrow return rc; 239237fead6SMichael Halcrow } 240237fead6SMichael Halcrow 241237fead6SMichael Halcrow /** 242237fead6SMichael Halcrow * ecryptfs_lookup 243237fead6SMichael Halcrow * @dir: inode 244237fead6SMichael Halcrow * @dentry: The dentry 245237fead6SMichael Halcrow * @nd: nameidata, may be NULL 246237fead6SMichael Halcrow * 247237fead6SMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 248237fead6SMichael Halcrow * dentry cache and continue on to read it from the disk. 249237fead6SMichael Halcrow */ 250237fead6SMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, 251237fead6SMichael Halcrow struct nameidata *nd) 252237fead6SMichael Halcrow { 253237fead6SMichael Halcrow int rc = 0; 254237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 255237fead6SMichael Halcrow struct dentry *lower_dentry; 256237fead6SMichael Halcrow struct vfsmount *lower_mnt; 257237fead6SMichael Halcrow char *encoded_name; 258c381bfcfSMika Kukkonen int encoded_namelen; 259237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = NULL; 260e77a56ddSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 261237fead6SMichael Halcrow char *page_virt = NULL; 262237fead6SMichael Halcrow struct inode *lower_inode; 263237fead6SMichael Halcrow u64 file_size; 264237fead6SMichael Halcrow 265237fead6SMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); 266237fead6SMichael Halcrow dentry->d_op = &ecryptfs_dops; 267237fead6SMichael Halcrow if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, ".")) 26845ec4abaSMichael Halcrow || (dentry->d_name.len == 2 26945ec4abaSMichael Halcrow && !strcmp(dentry->d_name.name, ".."))) { 27045ec4abaSMichael Halcrow d_drop(dentry); 27145ec4abaSMichael Halcrow goto out; 27245ec4abaSMichael Halcrow } 273237fead6SMichael Halcrow encoded_namelen = ecryptfs_encode_filename(crypt_stat, 274237fead6SMichael Halcrow dentry->d_name.name, 275237fead6SMichael Halcrow dentry->d_name.len, 276237fead6SMichael Halcrow &encoded_name); 277237fead6SMichael Halcrow if (encoded_namelen < 0) { 278237fead6SMichael Halcrow rc = encoded_namelen; 27945ec4abaSMichael Halcrow d_drop(dentry); 28045ec4abaSMichael Halcrow goto out; 281237fead6SMichael Halcrow } 282237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen " 283237fead6SMichael Halcrow "= [%d]\n", encoded_name, encoded_namelen); 284237fead6SMichael Halcrow lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry, 285237fead6SMichael Halcrow encoded_namelen - 1); 286237fead6SMichael Halcrow kfree(encoded_name); 287237fead6SMichael Halcrow if (IS_ERR(lower_dentry)) { 288237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n"); 289237fead6SMichael Halcrow rc = PTR_ERR(lower_dentry); 29045ec4abaSMichael Halcrow d_drop(dentry); 29145ec4abaSMichael Halcrow goto out; 292237fead6SMichael Halcrow } 29345ec4abaSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 294237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->" 295237fead6SMichael Halcrow "d_name.name = [%s]\n", lower_dentry, 296237fead6SMichael Halcrow lower_dentry->d_name.name); 297237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 2980cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_atime(dir, lower_dir_dentry->d_inode); 299237fead6SMichael Halcrow BUG_ON(!atomic_read(&lower_dentry->d_count)); 300237fead6SMichael Halcrow ecryptfs_set_dentry_private(dentry, 301237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 302e94b1766SChristoph Lameter GFP_KERNEL)); 303237fead6SMichael Halcrow if (!ecryptfs_dentry_to_private(dentry)) { 304237fead6SMichael Halcrow rc = -ENOMEM; 305237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting " 306237fead6SMichael Halcrow "to allocate ecryptfs_dentry_info struct\n"); 307237fead6SMichael Halcrow goto out_dput; 308237fead6SMichael Halcrow } 309237fead6SMichael Halcrow ecryptfs_set_dentry_lower(dentry, lower_dentry); 310237fead6SMichael Halcrow ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); 311237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 312237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 313237fead6SMichael Halcrow d_add(dentry, NULL); 314237fead6SMichael Halcrow goto out; 315237fead6SMichael Halcrow } 316237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1); 317237fead6SMichael Halcrow if (rc) { 318237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error interposing\n"); 319237fead6SMichael Halcrow goto out_dput; 320237fead6SMichael Halcrow } 321237fead6SMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) { 322237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n"); 323237fead6SMichael Halcrow goto out; 324237fead6SMichael Halcrow } 325237fead6SMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) { 326237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n"); 327237fead6SMichael Halcrow goto out; 328237fead6SMichael Halcrow } 329202a21d6SRyusuke Konishi if (special_file(lower_inode->i_mode)) { 330202a21d6SRyusuke Konishi ecryptfs_printk(KERN_DEBUG, "Is a special file; returning\n"); 331202a21d6SRyusuke Konishi goto out; 332202a21d6SRyusuke Konishi } 333237fead6SMichael Halcrow if (!nd) { 334237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave" 335237fead6SMichael Halcrow "as we *think* we are about to unlink\n"); 336237fead6SMichael Halcrow goto out; 337237fead6SMichael Halcrow } 338237fead6SMichael Halcrow /* Released in this function */ 339c3762229SRobert P. J. Day page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, 340f7267c0cSChristoph Lameter GFP_USER); 341237fead6SMichael Halcrow if (!page_virt) { 342237fead6SMichael Halcrow rc = -ENOMEM; 343237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, 344237fead6SMichael Halcrow "Cannot ecryptfs_kmalloc a page\n"); 345237fead6SMichael Halcrow goto out_dput; 346237fead6SMichael Halcrow } 347237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 348e2bd99ecSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 349237fead6SMichael Halcrow ecryptfs_set_default_sizes(crypt_stat); 350d7cdc5feSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, 351d7cdc5feSMichael Halcrow dentry->d_inode); 352237fead6SMichael Halcrow if (rc) { 353dd2a3b7aSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, dentry); 354dd2a3b7aSMichael Halcrow if (rc) { 355dd2a3b7aSMichael Halcrow printk(KERN_DEBUG "Valid metadata not found in header " 356dd2a3b7aSMichael Halcrow "region or xattr region; treating file as " 357dd2a3b7aSMichael Halcrow "unencrypted\n"); 358237fead6SMichael Halcrow rc = 0; 359237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 360237fead6SMichael Halcrow goto out; 361237fead6SMichael Halcrow } 362dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 363dd2a3b7aSMichael Halcrow } 364e77a56ddSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 365e77a56ddSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 366e77a56ddSMichael Halcrow if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { 367e77a56ddSMichael Halcrow if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 36845eaab79SMichael Halcrow file_size = ((crypt_stat->extent_size 36945eaab79SMichael Halcrow * crypt_stat->num_header_extents_at_front) 370e77a56ddSMichael Halcrow + i_size_read(lower_dentry->d_inode)); 371e77a56ddSMichael Halcrow else 372e77a56ddSMichael Halcrow file_size = i_size_read(lower_dentry->d_inode); 373e77a56ddSMichael Halcrow } else { 374237fead6SMichael Halcrow memcpy(&file_size, page_virt, sizeof(file_size)); 375237fead6SMichael Halcrow file_size = be64_to_cpu(file_size); 376e77a56ddSMichael Halcrow } 377237fead6SMichael Halcrow i_size_write(dentry->d_inode, (loff_t)file_size); 378237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 379237fead6SMichael Halcrow goto out; 380237fead6SMichael Halcrow 381237fead6SMichael Halcrow out_dput: 382237fead6SMichael Halcrow dput(lower_dentry); 383237fead6SMichael Halcrow d_drop(dentry); 384237fead6SMichael Halcrow out: 385237fead6SMichael Halcrow return ERR_PTR(rc); 386237fead6SMichael Halcrow } 387237fead6SMichael Halcrow 388237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 389237fead6SMichael Halcrow struct dentry *new_dentry) 390237fead6SMichael Halcrow { 391237fead6SMichael Halcrow struct dentry *lower_old_dentry; 392237fead6SMichael Halcrow struct dentry *lower_new_dentry; 393237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 394237fead6SMichael Halcrow u64 file_size_save; 395237fead6SMichael Halcrow int rc; 396237fead6SMichael Halcrow 397237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 398237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 399237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 400237fead6SMichael Halcrow dget(lower_old_dentry); 401237fead6SMichael Halcrow dget(lower_new_dentry); 402237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 403237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 404237fead6SMichael Halcrow lower_new_dentry); 405237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 406237fead6SMichael Halcrow goto out_lock; 407237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 408237fead6SMichael Halcrow if (rc) 409237fead6SMichael Halcrow goto out_lock; 4100cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); 4110cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); 412237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 413237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 414237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 415237fead6SMichael Halcrow out_lock: 416237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 417237fead6SMichael Halcrow dput(lower_new_dentry); 418237fead6SMichael Halcrow dput(lower_old_dentry); 419ae56fb16SMichael Halcrow d_drop(lower_old_dentry); 420237fead6SMichael Halcrow d_drop(new_dentry); 42145ec4abaSMichael Halcrow d_drop(old_dentry); 422237fead6SMichael Halcrow return rc; 423237fead6SMichael Halcrow } 424237fead6SMichael Halcrow 425237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 426237fead6SMichael Halcrow { 427237fead6SMichael Halcrow int rc = 0; 428237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 429237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 430237fead6SMichael Halcrow 431237fead6SMichael Halcrow lock_parent(lower_dentry); 432237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 433237fead6SMichael Halcrow if (rc) { 434ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 435237fead6SMichael Halcrow goto out_unlock; 436237fead6SMichael Halcrow } 4370cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 438237fead6SMichael Halcrow dentry->d_inode->i_nlink = 439237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 440237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 441caeeeecfSMichael Halcrow d_drop(dentry); 442237fead6SMichael Halcrow out_unlock: 443237fead6SMichael Halcrow unlock_parent(lower_dentry); 444237fead6SMichael Halcrow return rc; 445237fead6SMichael Halcrow } 446237fead6SMichael Halcrow 447237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 448237fead6SMichael Halcrow const char *symname) 449237fead6SMichael Halcrow { 450237fead6SMichael Halcrow int rc; 451237fead6SMichael Halcrow struct dentry *lower_dentry; 452237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 453237fead6SMichael Halcrow umode_t mode; 454237fead6SMichael Halcrow char *encoded_symname; 455c381bfcfSMika Kukkonen int encoded_symlen; 456237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = NULL; 457237fead6SMichael Halcrow 458237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 459237fead6SMichael Halcrow dget(lower_dentry); 460237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 461237fead6SMichael Halcrow mode = S_IALLUGO; 462237fead6SMichael Halcrow encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname, 463237fead6SMichael Halcrow strlen(symname), 464237fead6SMichael Halcrow &encoded_symname); 465237fead6SMichael Halcrow if (encoded_symlen < 0) { 466237fead6SMichael Halcrow rc = encoded_symlen; 467237fead6SMichael Halcrow goto out_lock; 468237fead6SMichael Halcrow } 469237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 470237fead6SMichael Halcrow encoded_symname, mode); 471237fead6SMichael Halcrow kfree(encoded_symname); 472237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 473237fead6SMichael Halcrow goto out_lock; 474237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 475237fead6SMichael Halcrow if (rc) 476237fead6SMichael Halcrow goto out_lock; 4770cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4780cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 479237fead6SMichael Halcrow out_lock: 480237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 481237fead6SMichael Halcrow dput(lower_dentry); 482237fead6SMichael Halcrow if (!dentry->d_inode) 483237fead6SMichael Halcrow d_drop(dentry); 484237fead6SMichael Halcrow return rc; 485237fead6SMichael Halcrow } 486237fead6SMichael Halcrow 487237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 488237fead6SMichael Halcrow { 489237fead6SMichael Halcrow int rc; 490237fead6SMichael Halcrow struct dentry *lower_dentry; 491237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 492237fead6SMichael Halcrow 493237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 494237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 495237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 496237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 497237fead6SMichael Halcrow goto out; 498237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 499237fead6SMichael Halcrow if (rc) 500237fead6SMichael Halcrow goto out; 5010cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5020cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 503237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 504237fead6SMichael Halcrow out: 505237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 506237fead6SMichael Halcrow if (!dentry->d_inode) 507237fead6SMichael Halcrow d_drop(dentry); 508237fead6SMichael Halcrow return rc; 509237fead6SMichael Halcrow } 510237fead6SMichael Halcrow 511237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 512237fead6SMichael Halcrow { 513237fead6SMichael Halcrow struct dentry *lower_dentry; 514237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 51545ec4abaSMichael Halcrow int rc; 516237fead6SMichael Halcrow 517237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 51845ec4abaSMichael Halcrow dget(dentry); 519237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 52045ec4abaSMichael Halcrow dget(lower_dentry); 521237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 52245ec4abaSMichael Halcrow dput(lower_dentry); 52345ec4abaSMichael Halcrow if (!rc) 52445ec4abaSMichael Halcrow d_delete(lower_dentry); 5250cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 526237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 527237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 528237fead6SMichael Halcrow if (!rc) 529237fead6SMichael Halcrow d_drop(dentry); 53045ec4abaSMichael Halcrow dput(dentry); 531237fead6SMichael Halcrow return rc; 532237fead6SMichael Halcrow } 533237fead6SMichael Halcrow 534237fead6SMichael Halcrow static int 535237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 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_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 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 out: 552237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 553237fead6SMichael Halcrow if (!dentry->d_inode) 554237fead6SMichael Halcrow d_drop(dentry); 555237fead6SMichael Halcrow return rc; 556237fead6SMichael Halcrow } 557237fead6SMichael Halcrow 558237fead6SMichael Halcrow static int 559237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 560237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 561237fead6SMichael Halcrow { 562237fead6SMichael Halcrow int rc; 563237fead6SMichael Halcrow struct dentry *lower_old_dentry; 564237fead6SMichael Halcrow struct dentry *lower_new_dentry; 565237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 566237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 567237fead6SMichael Halcrow 568237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 569237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 570237fead6SMichael Halcrow dget(lower_old_dentry); 571237fead6SMichael Halcrow dget(lower_new_dentry); 572237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 573237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 574237fead6SMichael Halcrow lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 575237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 576237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 577237fead6SMichael Halcrow if (rc) 578237fead6SMichael Halcrow goto out_lock; 5790cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL); 580237fead6SMichael Halcrow if (new_dir != old_dir) 5810cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL); 582237fead6SMichael Halcrow out_lock: 583237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 584a9083081SMichael Halcrow dput(lower_new_dentry->d_parent); 585a9083081SMichael Halcrow dput(lower_old_dentry->d_parent); 586237fead6SMichael Halcrow dput(lower_new_dentry); 587237fead6SMichael Halcrow dput(lower_old_dentry); 588237fead6SMichael Halcrow return rc; 589237fead6SMichael Halcrow } 590237fead6SMichael Halcrow 591237fead6SMichael Halcrow static int 592237fead6SMichael Halcrow ecryptfs_readlink(struct dentry *dentry, char __user * buf, int bufsiz) 593237fead6SMichael Halcrow { 594237fead6SMichael Halcrow int rc; 595237fead6SMichael Halcrow struct dentry *lower_dentry; 596237fead6SMichael Halcrow char *decoded_name; 597237fead6SMichael Halcrow char *lower_buf; 598237fead6SMichael Halcrow mm_segment_t old_fs; 599237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 600237fead6SMichael Halcrow 601237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 602237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op || 603237fead6SMichael Halcrow !lower_dentry->d_inode->i_op->readlink) { 604237fead6SMichael Halcrow rc = -EINVAL; 605237fead6SMichael Halcrow goto out; 606237fead6SMichael Halcrow } 607237fead6SMichael Halcrow /* Released in this function */ 608237fead6SMichael Halcrow lower_buf = kmalloc(bufsiz, GFP_KERNEL); 609237fead6SMichael Halcrow if (lower_buf == NULL) { 610237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Out of memory\n"); 611237fead6SMichael Halcrow rc = -ENOMEM; 612237fead6SMichael Halcrow goto out; 613237fead6SMichael Halcrow } 614237fead6SMichael Halcrow old_fs = get_fs(); 615237fead6SMichael Halcrow set_fs(get_ds()); 616237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " 617237fead6SMichael Halcrow "lower_dentry->d_name.name = [%s]\n", 618237fead6SMichael Halcrow lower_dentry->d_name.name); 619237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 620237fead6SMichael Halcrow (char __user *)lower_buf, 621237fead6SMichael Halcrow bufsiz); 622237fead6SMichael Halcrow set_fs(old_fs); 623237fead6SMichael Halcrow if (rc >= 0) { 624237fead6SMichael Halcrow crypt_stat = NULL; 625237fead6SMichael Halcrow rc = ecryptfs_decode_filename(crypt_stat, lower_buf, rc, 626237fead6SMichael Halcrow &decoded_name); 627237fead6SMichael Halcrow if (rc == -ENOMEM) 628237fead6SMichael Halcrow goto out_free_lower_buf; 629237fead6SMichael Halcrow if (rc > 0) { 630237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Copying [%d] bytes " 631237fead6SMichael Halcrow "to userspace: [%*s]\n", rc, 632237fead6SMichael Halcrow decoded_name); 633237fead6SMichael Halcrow if (copy_to_user(buf, decoded_name, rc)) 634237fead6SMichael Halcrow rc = -EFAULT; 635237fead6SMichael Halcrow } 636237fead6SMichael Halcrow kfree(decoded_name); 6370cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_atime(dentry->d_inode, 638237fead6SMichael Halcrow lower_dentry->d_inode); 639237fead6SMichael Halcrow } 640237fead6SMichael Halcrow out_free_lower_buf: 641237fead6SMichael Halcrow kfree(lower_buf); 642237fead6SMichael Halcrow out: 643237fead6SMichael Halcrow return rc; 644237fead6SMichael Halcrow } 645237fead6SMichael Halcrow 646237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 647237fead6SMichael Halcrow { 648237fead6SMichael Halcrow char *buf; 649237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 650237fead6SMichael Halcrow mm_segment_t old_fs; 651237fead6SMichael Halcrow 652237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 653237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 654237fead6SMichael Halcrow if (!buf) { 655237fead6SMichael Halcrow rc = -ENOMEM; 656237fead6SMichael Halcrow goto out; 657237fead6SMichael Halcrow } 658237fead6SMichael Halcrow old_fs = get_fs(); 659237fead6SMichael Halcrow set_fs(get_ds()); 660237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " 661237fead6SMichael Halcrow "dentry->d_name.name = [%s]\n", dentry->d_name.name); 662237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 663237fead6SMichael Halcrow buf[rc] = '\0'; 664237fead6SMichael Halcrow set_fs(old_fs); 665237fead6SMichael Halcrow if (rc < 0) 666237fead6SMichael Halcrow goto out_free; 667237fead6SMichael Halcrow rc = 0; 668237fead6SMichael Halcrow nd_set_link(nd, buf); 669237fead6SMichael Halcrow goto out; 670237fead6SMichael Halcrow out_free: 671237fead6SMichael Halcrow kfree(buf); 672237fead6SMichael Halcrow out: 673237fead6SMichael Halcrow return ERR_PTR(rc); 674237fead6SMichael Halcrow } 675237fead6SMichael Halcrow 676237fead6SMichael Halcrow static void 677237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 678237fead6SMichael Halcrow { 679237fead6SMichael Halcrow /* Free the char* */ 680237fead6SMichael Halcrow kfree(nd_get_link(nd)); 681237fead6SMichael Halcrow } 682237fead6SMichael Halcrow 683237fead6SMichael Halcrow /** 684237fead6SMichael Halcrow * upper_size_to_lower_size 685237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 686237fead6SMichael Halcrow * @upper_size: Size of the upper file 687237fead6SMichael Halcrow * 688237fead6SMichael Halcrow * Calculate the requried size of the lower file based on the 689237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 690237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 691237fead6SMichael Halcrow * 692237fead6SMichael Halcrow * Returns Calculated size of the lower file. 693237fead6SMichael Halcrow */ 694237fead6SMichael Halcrow static loff_t 695237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 696237fead6SMichael Halcrow loff_t upper_size) 697237fead6SMichael Halcrow { 698237fead6SMichael Halcrow loff_t lower_size; 699237fead6SMichael Halcrow 70045eaab79SMichael Halcrow lower_size = (crypt_stat->extent_size 701237fead6SMichael Halcrow * crypt_stat->num_header_extents_at_front); 702237fead6SMichael Halcrow if (upper_size != 0) { 703237fead6SMichael Halcrow loff_t num_extents; 704237fead6SMichael Halcrow 705237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 706237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 707237fead6SMichael Halcrow num_extents++; 708237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 709237fead6SMichael Halcrow } 710237fead6SMichael Halcrow return lower_size; 711237fead6SMichael Halcrow } 712237fead6SMichael Halcrow 713237fead6SMichael Halcrow /** 714237fead6SMichael Halcrow * ecryptfs_truncate 715237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 716237fead6SMichael Halcrow * @new_length: The length to expand the file to 717237fead6SMichael Halcrow * 718237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 719237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 720237fead6SMichael Halcrow * writing strings of 0's out. When truncating, we need to modify the 721237fead6SMichael Halcrow * underlying file size according to the page index interpolations. 722237fead6SMichael Halcrow * 723237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 724237fead6SMichael Halcrow */ 725237fead6SMichael Halcrow int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 726237fead6SMichael Halcrow { 727237fead6SMichael Halcrow int rc = 0; 728237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 729237fead6SMichael Halcrow struct dentry *lower_dentry; 7302ed92554SMichael Halcrow struct file fake_ecryptfs_file; 731237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 732237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 733237fead6SMichael Halcrow loff_t lower_size_before_truncate; 734237fead6SMichael Halcrow loff_t lower_size_after_truncate; 735237fead6SMichael Halcrow 736237fead6SMichael Halcrow if (unlikely((new_length == i_size))) 737237fead6SMichael Halcrow goto out; 738237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 739237fead6SMichael Halcrow /* Set up a fake ecryptfs file, this is used to interface with 740237fead6SMichael Halcrow * the file in the underlying filesystem so that the 741237fead6SMichael Halcrow * truncation has an effect there as well. */ 742237fead6SMichael Halcrow memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); 743bd243a4bSJosef "Jeff" Sipek fake_ecryptfs_file.f_path.dentry = dentry; 744237fead6SMichael Halcrow /* Released at out_free: label */ 745237fead6SMichael Halcrow ecryptfs_set_file_private(&fake_ecryptfs_file, 746237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_file_info_cache, 747e94b1766SChristoph Lameter GFP_KERNEL)); 748237fead6SMichael Halcrow if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { 749237fead6SMichael Halcrow rc = -ENOMEM; 750237fead6SMichael Halcrow goto out; 751237fead6SMichael Halcrow } 752237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 7532ed92554SMichael Halcrow ecryptfs_set_file_lower( 7542ed92554SMichael Halcrow &fake_ecryptfs_file, 7552ed92554SMichael Halcrow ecryptfs_inode_to_private(dentry->d_inode)->lower_file); 756237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 757237fead6SMichael Halcrow if (new_length > i_size) { 7582ed92554SMichael Halcrow char zero[] = { 0x00 }; 759240e2df5SMichael Halcrow 7602ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7612ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7622ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7632ed92554SMichael Halcrow * file and the new and of the file */ 7642ed92554SMichael Halcrow rc = ecryptfs_write(&fake_ecryptfs_file, zero, 7652ed92554SMichael Halcrow (new_length - 1), 1); 7662ed92554SMichael Halcrow } else { /* new_length < i_size_read(inode) */ 7672ed92554SMichael Halcrow /* We're chopping off all the pages down do the page 7682ed92554SMichael Halcrow * in which new_length is located. Fill in the end of 7692ed92554SMichael Halcrow * that page from (new_length & ~PAGE_CACHE_MASK) to 7702ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 7712ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 7722ed92554SMichael Halcrow - (new_length & ~PAGE_CACHE_MASK)); 7732ed92554SMichael Halcrow 7742ed92554SMichael Halcrow if (num_zeros) { 7752ed92554SMichael Halcrow char *zeros_virt; 7762ed92554SMichael Halcrow 7772ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7782ed92554SMichael Halcrow if (!zeros_virt) { 7792ed92554SMichael Halcrow rc = -ENOMEM; 7802ed92554SMichael Halcrow goto out_free; 781240e2df5SMichael Halcrow } 7822ed92554SMichael Halcrow rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt, 7832ed92554SMichael Halcrow new_length, num_zeros); 7842ed92554SMichael Halcrow kfree(zeros_virt); 7855dda6992SMichael Halcrow if (rc) { 786240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 787240e2df5SMichael Halcrow "the remainder of the end page on " 788240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 7892ed92554SMichael Halcrow goto out_free; 790240e2df5SMichael Halcrow } 791240e2df5SMichael Halcrow } 792237fead6SMichael Halcrow vmtruncate(inode, new_length); 7930216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 794dd2a3b7aSMichael Halcrow if (rc) { 795dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 796dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 797dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 7982ed92554SMichael Halcrow goto out_free; 799dd2a3b7aSMichael Halcrow } 800237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 801237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 802237fead6SMichael Halcrow lower_size_before_truncate = 803237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 804237fead6SMichael Halcrow lower_size_after_truncate = 805237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, new_length); 806237fead6SMichael Halcrow if (lower_size_after_truncate < lower_size_before_truncate) 807237fead6SMichael Halcrow vmtruncate(lower_dentry->d_inode, 808237fead6SMichael Halcrow lower_size_after_truncate); 809237fead6SMichael Halcrow } 810237fead6SMichael Halcrow out_free: 811237fead6SMichael Halcrow if (ecryptfs_file_to_private(&fake_ecryptfs_file)) 812237fead6SMichael Halcrow kmem_cache_free(ecryptfs_file_info_cache, 813237fead6SMichael Halcrow ecryptfs_file_to_private(&fake_ecryptfs_file)); 814237fead6SMichael Halcrow out: 815237fead6SMichael Halcrow return rc; 816237fead6SMichael Halcrow } 817237fead6SMichael Halcrow 818237fead6SMichael Halcrow static int 819237fead6SMichael Halcrow ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd) 820237fead6SMichael Halcrow { 821237fead6SMichael Halcrow int rc; 822237fead6SMichael Halcrow 823237fead6SMichael Halcrow if (nd) { 824237fead6SMichael Halcrow struct vfsmount *vfsmnt_save = nd->mnt; 825237fead6SMichael Halcrow struct dentry *dentry_save = nd->dentry; 826237fead6SMichael Halcrow 827237fead6SMichael Halcrow nd->mnt = ecryptfs_dentry_to_lower_mnt(nd->dentry); 828237fead6SMichael Halcrow nd->dentry = ecryptfs_dentry_to_lower(nd->dentry); 829237fead6SMichael Halcrow rc = permission(ecryptfs_inode_to_lower(inode), mask, nd); 830237fead6SMichael Halcrow nd->mnt = vfsmnt_save; 831237fead6SMichael Halcrow nd->dentry = dentry_save; 832237fead6SMichael Halcrow } else 833237fead6SMichael Halcrow rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL); 834237fead6SMichael Halcrow return rc; 835237fead6SMichael Halcrow } 836237fead6SMichael Halcrow 837237fead6SMichael Halcrow /** 838237fead6SMichael Halcrow * ecryptfs_setattr 839237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 840237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 841237fead6SMichael Halcrow * 842237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 843237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 844237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 845237fead6SMichael Halcrow * 846237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 847237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 848237fead6SMichael Halcrow */ 849237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 850237fead6SMichael Halcrow { 851237fead6SMichael Halcrow int rc = 0; 852237fead6SMichael Halcrow struct dentry *lower_dentry; 853237fead6SMichael Halcrow struct inode *inode; 854237fead6SMichael Halcrow struct inode *lower_inode; 855237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 856237fead6SMichael Halcrow 857237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 858e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 859e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 860237fead6SMichael Halcrow inode = dentry->d_inode; 861237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 862e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 863e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 864e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 865e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 86664ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 86764ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 86864ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 869e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 870e10f281bSMichael Halcrow 871e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 872e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 873d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 8745dda6992SMichael Halcrow if (rc) { 875e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 876e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 877e10f281bSMichael Halcrow rc = -EIO; 878e10f281bSMichael Halcrow printk(KERN_WARNING "Attempt to read file that " 879e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 880e10f281bSMichael Halcrow "and plaintext passthrough mode is not " 881e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 882e10f281bSMichael Halcrow 883e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 884e10f281bSMichael Halcrow goto out; 885e10f281bSMichael Halcrow } 886e10f281bSMichael Halcrow rc = 0; 887e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 888e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 889e10f281bSMichael Halcrow goto out; 890e10f281bSMichael Halcrow } 891e10f281bSMichael Halcrow } 892e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 893237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 894237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, 895237fead6SMichael Halcrow "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", 896237fead6SMichael Halcrow ia->ia_valid, ATTR_SIZE); 897237fead6SMichael Halcrow rc = ecryptfs_truncate(dentry, ia->ia_size); 898237fead6SMichael Halcrow /* ecryptfs_truncate handles resizing of the lower file */ 899237fead6SMichael Halcrow ia->ia_valid &= ~ATTR_SIZE; 900237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n", 901237fead6SMichael Halcrow ia->ia_valid); 902237fead6SMichael Halcrow if (rc < 0) 903237fead6SMichael Halcrow goto out; 904237fead6SMichael Halcrow } 9051ac564ecSJeff Layton 9061ac564ecSJeff Layton /* 9071ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9081ac564ecSJeff Layton * to interpret this in its own way. 9091ac564ecSJeff Layton */ 9101ac564ecSJeff Layton if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9111ac564ecSJeff Layton ia->ia_valid &= ~ATTR_MODE; 9121ac564ecSJeff Layton 913237fead6SMichael Halcrow rc = notify_change(lower_dentry, ia); 914237fead6SMichael Halcrow out: 9150cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(inode, lower_inode, NULL); 916237fead6SMichael Halcrow return rc; 917237fead6SMichael Halcrow } 918237fead6SMichael Halcrow 919dd2a3b7aSMichael Halcrow int 920237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 921237fead6SMichael Halcrow size_t size, int flags) 922237fead6SMichael Halcrow { 923237fead6SMichael Halcrow int rc = 0; 924237fead6SMichael Halcrow struct dentry *lower_dentry; 925237fead6SMichael Halcrow 926237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 927237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 928237fead6SMichael Halcrow rc = -ENOSYS; 929237fead6SMichael Halcrow goto out; 930237fead6SMichael Halcrow } 931237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 932237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, 933237fead6SMichael Halcrow size, flags); 934237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 935237fead6SMichael Halcrow out: 936237fead6SMichael Halcrow return rc; 937237fead6SMichael Halcrow } 938237fead6SMichael Halcrow 939dd2a3b7aSMichael Halcrow ssize_t 940d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 941d7cdc5feSMichael Halcrow void *value, size_t size) 942d7cdc5feSMichael Halcrow { 943d7cdc5feSMichael Halcrow int rc = 0; 944d7cdc5feSMichael Halcrow 945d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 946d7cdc5feSMichael Halcrow rc = -ENOSYS; 947d7cdc5feSMichael Halcrow goto out; 948d7cdc5feSMichael Halcrow } 949d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 950d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 951d7cdc5feSMichael Halcrow size); 952d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 953d7cdc5feSMichael Halcrow out: 954d7cdc5feSMichael Halcrow return rc; 955d7cdc5feSMichael Halcrow } 956d7cdc5feSMichael Halcrow 957d7cdc5feSMichael Halcrow ssize_t 958237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 959237fead6SMichael Halcrow size_t size) 960237fead6SMichael Halcrow { 9612ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 9622ed92554SMichael Halcrow value, size); 963237fead6SMichael Halcrow } 964237fead6SMichael Halcrow 965237fead6SMichael Halcrow static ssize_t 966237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 967237fead6SMichael Halcrow { 968237fead6SMichael Halcrow int rc = 0; 969237fead6SMichael Halcrow struct dentry *lower_dentry; 970237fead6SMichael Halcrow 971237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 972237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 973237fead6SMichael Halcrow rc = -ENOSYS; 974237fead6SMichael Halcrow goto out; 975237fead6SMichael Halcrow } 976237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 977237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 978237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 979237fead6SMichael Halcrow out: 980237fead6SMichael Halcrow return rc; 981237fead6SMichael Halcrow } 982237fead6SMichael Halcrow 983237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 984237fead6SMichael Halcrow { 985237fead6SMichael Halcrow int rc = 0; 986237fead6SMichael Halcrow struct dentry *lower_dentry; 987237fead6SMichael Halcrow 988237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 989237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 990237fead6SMichael Halcrow rc = -ENOSYS; 991237fead6SMichael Halcrow goto out; 992237fead6SMichael Halcrow } 993237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 994237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 995237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 996237fead6SMichael Halcrow out: 997237fead6SMichael Halcrow return rc; 998237fead6SMichael Halcrow } 999237fead6SMichael Halcrow 1000237fead6SMichael Halcrow int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) 1001237fead6SMichael Halcrow { 1002237fead6SMichael Halcrow if ((ecryptfs_inode_to_lower(inode) 1003237fead6SMichael Halcrow == (struct inode *)candidate_lower_inode)) 1004237fead6SMichael Halcrow return 1; 1005237fead6SMichael Halcrow else 1006237fead6SMichael Halcrow return 0; 1007237fead6SMichael Halcrow } 1008237fead6SMichael Halcrow 1009237fead6SMichael Halcrow int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 1010237fead6SMichael Halcrow { 1011237fead6SMichael Halcrow ecryptfs_init_inode(inode, (struct inode *)lower_inode); 1012237fead6SMichael Halcrow return 0; 1013237fead6SMichael Halcrow } 1014237fead6SMichael Halcrow 1015754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1016237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1017237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1018237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1019237fead6SMichael Halcrow .permission = ecryptfs_permission, 1020237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1021237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1022237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1023237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1024237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1025237fead6SMichael Halcrow }; 1026237fead6SMichael Halcrow 1027754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1028237fead6SMichael Halcrow .create = ecryptfs_create, 1029237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1030237fead6SMichael Halcrow .link = ecryptfs_link, 1031237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1032237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1033237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1034237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1035237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1036237fead6SMichael Halcrow .rename = ecryptfs_rename, 1037237fead6SMichael Halcrow .permission = ecryptfs_permission, 1038237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1039237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1040237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1041237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1042237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1043237fead6SMichael Halcrow }; 1044237fead6SMichael Halcrow 1045754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1046237fead6SMichael Halcrow .permission = ecryptfs_permission, 1047237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1048237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1049237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1050237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1051237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1052237fead6SMichael Halcrow }; 1053