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 804ac91378SJan Blunck dentry_save = nd->path.dentry; 814ac91378SJan Blunck vfsmount_save = nd->path.mnt; 824ac91378SJan Blunck nd->path.dentry = lower_dentry; 834ac91378SJan Blunck nd->path.mnt = lower_mnt; 84237fead6SMichael Halcrow rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); 854ac91378SJan Blunck nd->path.dentry = dentry_save; 864ac91378SJan Blunck nd->path.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; " 12418d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, 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) 368cc11beffSMichael Halcrow file_size = (crypt_stat->num_header_bytes_at_front 369e77a56ddSMichael Halcrow + i_size_read(lower_dentry->d_inode)); 370e77a56ddSMichael Halcrow else 371e77a56ddSMichael Halcrow file_size = i_size_read(lower_dentry->d_inode); 372e77a56ddSMichael Halcrow } else { 373237fead6SMichael Halcrow memcpy(&file_size, page_virt, sizeof(file_size)); 374237fead6SMichael Halcrow file_size = be64_to_cpu(file_size); 375e77a56ddSMichael Halcrow } 376237fead6SMichael Halcrow i_size_write(dentry->d_inode, (loff_t)file_size); 377237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 378237fead6SMichael Halcrow goto out; 379237fead6SMichael Halcrow 380237fead6SMichael Halcrow out_dput: 381237fead6SMichael Halcrow dput(lower_dentry); 382237fead6SMichael Halcrow d_drop(dentry); 383237fead6SMichael Halcrow out: 384237fead6SMichael Halcrow return ERR_PTR(rc); 385237fead6SMichael Halcrow } 386237fead6SMichael Halcrow 387237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 388237fead6SMichael Halcrow struct dentry *new_dentry) 389237fead6SMichael Halcrow { 390237fead6SMichael Halcrow struct dentry *lower_old_dentry; 391237fead6SMichael Halcrow struct dentry *lower_new_dentry; 392237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 393237fead6SMichael Halcrow u64 file_size_save; 394237fead6SMichael Halcrow int rc; 395237fead6SMichael Halcrow 396237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 397237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 398237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 399237fead6SMichael Halcrow dget(lower_old_dentry); 400237fead6SMichael Halcrow dget(lower_new_dentry); 401237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 402237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 403237fead6SMichael Halcrow lower_new_dentry); 404237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 405237fead6SMichael Halcrow goto out_lock; 406237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 407237fead6SMichael Halcrow if (rc) 408237fead6SMichael Halcrow goto out_lock; 4090cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); 4100cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); 411237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 412237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 413237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 414237fead6SMichael Halcrow out_lock: 415237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 416237fead6SMichael Halcrow dput(lower_new_dentry); 417237fead6SMichael Halcrow dput(lower_old_dentry); 418ae56fb16SMichael Halcrow d_drop(lower_old_dentry); 419237fead6SMichael Halcrow d_drop(new_dentry); 42045ec4abaSMichael Halcrow d_drop(old_dentry); 421237fead6SMichael Halcrow return rc; 422237fead6SMichael Halcrow } 423237fead6SMichael Halcrow 424237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 425237fead6SMichael Halcrow { 426237fead6SMichael Halcrow int rc = 0; 427237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 428237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 429237fead6SMichael Halcrow 430237fead6SMichael Halcrow lock_parent(lower_dentry); 431237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 432237fead6SMichael Halcrow if (rc) { 433ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 434237fead6SMichael Halcrow goto out_unlock; 435237fead6SMichael Halcrow } 4360cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 437237fead6SMichael Halcrow dentry->d_inode->i_nlink = 438237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 439237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 440caeeeecfSMichael Halcrow d_drop(dentry); 441237fead6SMichael Halcrow out_unlock: 442237fead6SMichael Halcrow unlock_parent(lower_dentry); 443237fead6SMichael Halcrow return rc; 444237fead6SMichael Halcrow } 445237fead6SMichael Halcrow 446237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 447237fead6SMichael Halcrow const char *symname) 448237fead6SMichael Halcrow { 449237fead6SMichael Halcrow int rc; 450237fead6SMichael Halcrow struct dentry *lower_dentry; 451237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 452237fead6SMichael Halcrow umode_t mode; 453237fead6SMichael Halcrow char *encoded_symname; 454c381bfcfSMika Kukkonen int encoded_symlen; 455237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = NULL; 456237fead6SMichael Halcrow 457237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 458237fead6SMichael Halcrow dget(lower_dentry); 459237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 460237fead6SMichael Halcrow mode = S_IALLUGO; 461237fead6SMichael Halcrow encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname, 462237fead6SMichael Halcrow strlen(symname), 463237fead6SMichael Halcrow &encoded_symname); 464237fead6SMichael Halcrow if (encoded_symlen < 0) { 465237fead6SMichael Halcrow rc = encoded_symlen; 466237fead6SMichael Halcrow goto out_lock; 467237fead6SMichael Halcrow } 468237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 469237fead6SMichael Halcrow encoded_symname, mode); 470237fead6SMichael Halcrow kfree(encoded_symname); 471237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 472237fead6SMichael Halcrow goto out_lock; 473237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 474237fead6SMichael Halcrow if (rc) 475237fead6SMichael Halcrow goto out_lock; 4760cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4770cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 478237fead6SMichael Halcrow out_lock: 479237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 480237fead6SMichael Halcrow dput(lower_dentry); 481237fead6SMichael Halcrow if (!dentry->d_inode) 482237fead6SMichael Halcrow d_drop(dentry); 483237fead6SMichael Halcrow return rc; 484237fead6SMichael Halcrow } 485237fead6SMichael Halcrow 486237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 487237fead6SMichael Halcrow { 488237fead6SMichael Halcrow int rc; 489237fead6SMichael Halcrow struct dentry *lower_dentry; 490237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 491237fead6SMichael Halcrow 492237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 493237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 494237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 495237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 496237fead6SMichael Halcrow goto out; 497237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 498237fead6SMichael Halcrow if (rc) 499237fead6SMichael Halcrow goto out; 5000cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5010cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 502237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 503237fead6SMichael Halcrow out: 504237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 505237fead6SMichael Halcrow if (!dentry->d_inode) 506237fead6SMichael Halcrow d_drop(dentry); 507237fead6SMichael Halcrow return rc; 508237fead6SMichael Halcrow } 509237fead6SMichael Halcrow 510237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 511237fead6SMichael Halcrow { 512237fead6SMichael Halcrow struct dentry *lower_dentry; 513237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 51445ec4abaSMichael Halcrow int rc; 515237fead6SMichael Halcrow 516237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 51745ec4abaSMichael Halcrow dget(dentry); 518237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 51945ec4abaSMichael Halcrow dget(lower_dentry); 520237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 52145ec4abaSMichael Halcrow dput(lower_dentry); 52245ec4abaSMichael Halcrow if (!rc) 52345ec4abaSMichael Halcrow d_delete(lower_dentry); 5240cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 525237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 526237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 527237fead6SMichael Halcrow if (!rc) 528237fead6SMichael Halcrow d_drop(dentry); 52945ec4abaSMichael Halcrow dput(dentry); 530237fead6SMichael Halcrow return rc; 531237fead6SMichael Halcrow } 532237fead6SMichael Halcrow 533237fead6SMichael Halcrow static int 534237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 535237fead6SMichael Halcrow { 536237fead6SMichael Halcrow int rc; 537237fead6SMichael Halcrow struct dentry *lower_dentry; 538237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 539237fead6SMichael Halcrow 540237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 541237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 542237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 543237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 544237fead6SMichael Halcrow goto out; 545237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 546237fead6SMichael Halcrow if (rc) 547237fead6SMichael Halcrow goto out; 5480cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5490cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 550237fead6SMichael Halcrow out: 551237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 552237fead6SMichael Halcrow if (!dentry->d_inode) 553237fead6SMichael Halcrow d_drop(dentry); 554237fead6SMichael Halcrow return rc; 555237fead6SMichael Halcrow } 556237fead6SMichael Halcrow 557237fead6SMichael Halcrow static int 558237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 559237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 560237fead6SMichael Halcrow { 561237fead6SMichael Halcrow int rc; 562237fead6SMichael Halcrow struct dentry *lower_old_dentry; 563237fead6SMichael Halcrow struct dentry *lower_new_dentry; 564237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 565237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 566237fead6SMichael Halcrow 567237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 568237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 569237fead6SMichael Halcrow dget(lower_old_dentry); 570237fead6SMichael Halcrow dget(lower_new_dentry); 571237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 572237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 573237fead6SMichael Halcrow lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 574237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 575237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 576237fead6SMichael Halcrow if (rc) 577237fead6SMichael Halcrow goto out_lock; 5780cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL); 579237fead6SMichael Halcrow if (new_dir != old_dir) 5800cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL); 581237fead6SMichael Halcrow out_lock: 582237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 583a9083081SMichael Halcrow dput(lower_new_dentry->d_parent); 584a9083081SMichael Halcrow dput(lower_old_dentry->d_parent); 585237fead6SMichael Halcrow dput(lower_new_dentry); 586237fead6SMichael Halcrow dput(lower_old_dentry); 587237fead6SMichael Halcrow return rc; 588237fead6SMichael Halcrow } 589237fead6SMichael Halcrow 590237fead6SMichael Halcrow static int 591237fead6SMichael Halcrow ecryptfs_readlink(struct dentry *dentry, char __user * buf, int bufsiz) 592237fead6SMichael Halcrow { 593237fead6SMichael Halcrow int rc; 594237fead6SMichael Halcrow struct dentry *lower_dentry; 595237fead6SMichael Halcrow char *decoded_name; 596237fead6SMichael Halcrow char *lower_buf; 597237fead6SMichael Halcrow mm_segment_t old_fs; 598237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 599237fead6SMichael Halcrow 600237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 601237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op || 602237fead6SMichael Halcrow !lower_dentry->d_inode->i_op->readlink) { 603237fead6SMichael Halcrow rc = -EINVAL; 604237fead6SMichael Halcrow goto out; 605237fead6SMichael Halcrow } 606237fead6SMichael Halcrow /* Released in this function */ 607237fead6SMichael Halcrow lower_buf = kmalloc(bufsiz, GFP_KERNEL); 608237fead6SMichael Halcrow if (lower_buf == NULL) { 609237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Out of memory\n"); 610237fead6SMichael Halcrow rc = -ENOMEM; 611237fead6SMichael Halcrow goto out; 612237fead6SMichael Halcrow } 613237fead6SMichael Halcrow old_fs = get_fs(); 614237fead6SMichael Halcrow set_fs(get_ds()); 615237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " 616237fead6SMichael Halcrow "lower_dentry->d_name.name = [%s]\n", 617237fead6SMichael Halcrow lower_dentry->d_name.name); 618237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 619237fead6SMichael Halcrow (char __user *)lower_buf, 620237fead6SMichael Halcrow bufsiz); 621237fead6SMichael Halcrow set_fs(old_fs); 622237fead6SMichael Halcrow if (rc >= 0) { 623237fead6SMichael Halcrow crypt_stat = NULL; 624237fead6SMichael Halcrow rc = ecryptfs_decode_filename(crypt_stat, lower_buf, rc, 625237fead6SMichael Halcrow &decoded_name); 626237fead6SMichael Halcrow if (rc == -ENOMEM) 627237fead6SMichael Halcrow goto out_free_lower_buf; 628237fead6SMichael Halcrow if (rc > 0) { 629237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Copying [%d] bytes " 630237fead6SMichael Halcrow "to userspace: [%*s]\n", rc, 631237fead6SMichael Halcrow decoded_name); 632237fead6SMichael Halcrow if (copy_to_user(buf, decoded_name, rc)) 633237fead6SMichael Halcrow rc = -EFAULT; 634237fead6SMichael Halcrow } 635237fead6SMichael Halcrow kfree(decoded_name); 6360cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_atime(dentry->d_inode, 637237fead6SMichael Halcrow lower_dentry->d_inode); 638237fead6SMichael Halcrow } 639237fead6SMichael Halcrow out_free_lower_buf: 640237fead6SMichael Halcrow kfree(lower_buf); 641237fead6SMichael Halcrow out: 642237fead6SMichael Halcrow return rc; 643237fead6SMichael Halcrow } 644237fead6SMichael Halcrow 645237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 646237fead6SMichael Halcrow { 647237fead6SMichael Halcrow char *buf; 648237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 649237fead6SMichael Halcrow mm_segment_t old_fs; 650237fead6SMichael Halcrow 651237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 652237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 653237fead6SMichael Halcrow if (!buf) { 654237fead6SMichael Halcrow rc = -ENOMEM; 655237fead6SMichael Halcrow goto out; 656237fead6SMichael Halcrow } 657237fead6SMichael Halcrow old_fs = get_fs(); 658237fead6SMichael Halcrow set_fs(get_ds()); 659237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " 660237fead6SMichael Halcrow "dentry->d_name.name = [%s]\n", dentry->d_name.name); 661237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 662237fead6SMichael Halcrow buf[rc] = '\0'; 663237fead6SMichael Halcrow set_fs(old_fs); 664237fead6SMichael Halcrow if (rc < 0) 665237fead6SMichael Halcrow goto out_free; 666237fead6SMichael Halcrow rc = 0; 667237fead6SMichael Halcrow nd_set_link(nd, buf); 668237fead6SMichael Halcrow goto out; 669237fead6SMichael Halcrow out_free: 670237fead6SMichael Halcrow kfree(buf); 671237fead6SMichael Halcrow out: 672237fead6SMichael Halcrow return ERR_PTR(rc); 673237fead6SMichael Halcrow } 674237fead6SMichael Halcrow 675237fead6SMichael Halcrow static void 676237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 677237fead6SMichael Halcrow { 678237fead6SMichael Halcrow /* Free the char* */ 679237fead6SMichael Halcrow kfree(nd_get_link(nd)); 680237fead6SMichael Halcrow } 681237fead6SMichael Halcrow 682237fead6SMichael Halcrow /** 683237fead6SMichael Halcrow * upper_size_to_lower_size 684237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 685237fead6SMichael Halcrow * @upper_size: Size of the upper file 686237fead6SMichael Halcrow * 687cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 688237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 689237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 690237fead6SMichael Halcrow * 691237fead6SMichael Halcrow * Returns Calculated size of the lower file. 692237fead6SMichael Halcrow */ 693237fead6SMichael Halcrow static loff_t 694237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 695237fead6SMichael Halcrow loff_t upper_size) 696237fead6SMichael Halcrow { 697237fead6SMichael Halcrow loff_t lower_size; 698237fead6SMichael Halcrow 699cc11beffSMichael Halcrow lower_size = crypt_stat->num_header_bytes_at_front; 700237fead6SMichael Halcrow if (upper_size != 0) { 701237fead6SMichael Halcrow loff_t num_extents; 702237fead6SMichael Halcrow 703237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 704237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 705237fead6SMichael Halcrow num_extents++; 706237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 707237fead6SMichael Halcrow } 708237fead6SMichael Halcrow return lower_size; 709237fead6SMichael Halcrow } 710237fead6SMichael Halcrow 711237fead6SMichael Halcrow /** 712237fead6SMichael Halcrow * ecryptfs_truncate 713237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 714237fead6SMichael Halcrow * @new_length: The length to expand the file to 715237fead6SMichael Halcrow * 716237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 717237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 718237fead6SMichael Halcrow * writing strings of 0's out. When truncating, we need to modify the 719237fead6SMichael Halcrow * underlying file size according to the page index interpolations. 720237fead6SMichael Halcrow * 721237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 722237fead6SMichael Halcrow */ 723237fead6SMichael Halcrow int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 724237fead6SMichael Halcrow { 725237fead6SMichael Halcrow int rc = 0; 726237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 727237fead6SMichael Halcrow struct dentry *lower_dentry; 7282ed92554SMichael Halcrow struct file fake_ecryptfs_file; 729237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 730237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 731237fead6SMichael Halcrow loff_t lower_size_before_truncate; 732237fead6SMichael Halcrow loff_t lower_size_after_truncate; 733237fead6SMichael Halcrow 734237fead6SMichael Halcrow if (unlikely((new_length == i_size))) 735237fead6SMichael Halcrow goto out; 736237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 737237fead6SMichael Halcrow /* Set up a fake ecryptfs file, this is used to interface with 738237fead6SMichael Halcrow * the file in the underlying filesystem so that the 739237fead6SMichael Halcrow * truncation has an effect there as well. */ 740237fead6SMichael Halcrow memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); 741bd243a4bSJosef "Jeff" Sipek fake_ecryptfs_file.f_path.dentry = dentry; 742237fead6SMichael Halcrow /* Released at out_free: label */ 743237fead6SMichael Halcrow ecryptfs_set_file_private(&fake_ecryptfs_file, 744237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_file_info_cache, 745e94b1766SChristoph Lameter GFP_KERNEL)); 746237fead6SMichael Halcrow if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { 747237fead6SMichael Halcrow rc = -ENOMEM; 748237fead6SMichael Halcrow goto out; 749237fead6SMichael Halcrow } 750237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 7512ed92554SMichael Halcrow ecryptfs_set_file_lower( 7522ed92554SMichael Halcrow &fake_ecryptfs_file, 7532ed92554SMichael Halcrow ecryptfs_inode_to_private(dentry->d_inode)->lower_file); 754237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 755237fead6SMichael Halcrow if (new_length > i_size) { 7562ed92554SMichael Halcrow char zero[] = { 0x00 }; 757240e2df5SMichael Halcrow 7582ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7592ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7602ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7612ed92554SMichael Halcrow * file and the new and of the file */ 7622ed92554SMichael Halcrow rc = ecryptfs_write(&fake_ecryptfs_file, zero, 7632ed92554SMichael Halcrow (new_length - 1), 1); 7642ed92554SMichael Halcrow } else { /* new_length < i_size_read(inode) */ 7652ed92554SMichael Halcrow /* We're chopping off all the pages down do the page 7662ed92554SMichael Halcrow * in which new_length is located. Fill in the end of 7672ed92554SMichael Halcrow * that page from (new_length & ~PAGE_CACHE_MASK) to 7682ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 7692ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 7702ed92554SMichael Halcrow - (new_length & ~PAGE_CACHE_MASK)); 7712ed92554SMichael Halcrow 7722ed92554SMichael Halcrow if (num_zeros) { 7732ed92554SMichael Halcrow char *zeros_virt; 7742ed92554SMichael Halcrow 7752ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7762ed92554SMichael Halcrow if (!zeros_virt) { 7772ed92554SMichael Halcrow rc = -ENOMEM; 7782ed92554SMichael Halcrow goto out_free; 779240e2df5SMichael Halcrow } 7802ed92554SMichael Halcrow rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt, 7812ed92554SMichael Halcrow new_length, num_zeros); 7822ed92554SMichael Halcrow kfree(zeros_virt); 7835dda6992SMichael Halcrow if (rc) { 784240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 785240e2df5SMichael Halcrow "the remainder of the end page on " 786240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 7872ed92554SMichael Halcrow goto out_free; 788240e2df5SMichael Halcrow } 789240e2df5SMichael Halcrow } 790237fead6SMichael Halcrow vmtruncate(inode, new_length); 7910216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 792dd2a3b7aSMichael Halcrow if (rc) { 793dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 794dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 795dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 7962ed92554SMichael Halcrow goto out_free; 797dd2a3b7aSMichael Halcrow } 798237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 799237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 800237fead6SMichael Halcrow lower_size_before_truncate = 801237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 802237fead6SMichael Halcrow lower_size_after_truncate = 803237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, new_length); 804237fead6SMichael Halcrow if (lower_size_after_truncate < lower_size_before_truncate) 805237fead6SMichael Halcrow vmtruncate(lower_dentry->d_inode, 806237fead6SMichael Halcrow lower_size_after_truncate); 807237fead6SMichael Halcrow } 808237fead6SMichael Halcrow out_free: 809237fead6SMichael Halcrow if (ecryptfs_file_to_private(&fake_ecryptfs_file)) 810237fead6SMichael Halcrow kmem_cache_free(ecryptfs_file_info_cache, 811237fead6SMichael Halcrow ecryptfs_file_to_private(&fake_ecryptfs_file)); 812237fead6SMichael Halcrow out: 813237fead6SMichael Halcrow return rc; 814237fead6SMichael Halcrow } 815237fead6SMichael Halcrow 816237fead6SMichael Halcrow static int 817237fead6SMichael Halcrow ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd) 818237fead6SMichael Halcrow { 819237fead6SMichael Halcrow int rc; 820237fead6SMichael Halcrow 821237fead6SMichael Halcrow if (nd) { 8224ac91378SJan Blunck struct vfsmount *vfsmnt_save = nd->path.mnt; 8234ac91378SJan Blunck struct dentry *dentry_save = nd->path.dentry; 824237fead6SMichael Halcrow 8254ac91378SJan Blunck nd->path.mnt = ecryptfs_dentry_to_lower_mnt(nd->path.dentry); 8264ac91378SJan Blunck nd->path.dentry = ecryptfs_dentry_to_lower(nd->path.dentry); 827237fead6SMichael Halcrow rc = permission(ecryptfs_inode_to_lower(inode), mask, nd); 8284ac91378SJan Blunck nd->path.mnt = vfsmnt_save; 8294ac91378SJan Blunck nd->path.dentry = dentry_save; 830237fead6SMichael Halcrow } else 831237fead6SMichael Halcrow rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL); 832237fead6SMichael Halcrow return rc; 833237fead6SMichael Halcrow } 834237fead6SMichael Halcrow 835237fead6SMichael Halcrow /** 836237fead6SMichael Halcrow * ecryptfs_setattr 837237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 838237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 839237fead6SMichael Halcrow * 840237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 841237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 842237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 843237fead6SMichael Halcrow * 844237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 845237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 846237fead6SMichael Halcrow */ 847237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 848237fead6SMichael Halcrow { 849237fead6SMichael Halcrow int rc = 0; 850237fead6SMichael Halcrow struct dentry *lower_dentry; 851237fead6SMichael Halcrow struct inode *inode; 852237fead6SMichael Halcrow struct inode *lower_inode; 853237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 854237fead6SMichael Halcrow 855237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 856e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 857e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 858237fead6SMichael Halcrow inode = dentry->d_inode; 859237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 860e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 861e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 862e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 863e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 86464ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 86564ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 86664ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 867e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 868e10f281bSMichael Halcrow 869e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 870e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 871d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 8725dda6992SMichael Halcrow if (rc) { 873e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 874e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 875e10f281bSMichael Halcrow rc = -EIO; 87625bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 877e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 87825bd8174SMichael Halcrow "or the key could not be retrieved. " 87925bd8174SMichael Halcrow "Plaintext passthrough mode is not " 880e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 881e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 882e10f281bSMichael Halcrow goto out; 883e10f281bSMichael Halcrow } 884e10f281bSMichael Halcrow rc = 0; 885e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 886e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 887e10f281bSMichael Halcrow goto out; 888e10f281bSMichael Halcrow } 889e10f281bSMichael Halcrow } 890e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 891237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 892237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, 893237fead6SMichael Halcrow "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", 894237fead6SMichael Halcrow ia->ia_valid, ATTR_SIZE); 895237fead6SMichael Halcrow rc = ecryptfs_truncate(dentry, ia->ia_size); 896237fead6SMichael Halcrow /* ecryptfs_truncate handles resizing of the lower file */ 897237fead6SMichael Halcrow ia->ia_valid &= ~ATTR_SIZE; 898237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n", 899237fead6SMichael Halcrow ia->ia_valid); 900237fead6SMichael Halcrow if (rc < 0) 901237fead6SMichael Halcrow goto out; 902237fead6SMichael Halcrow } 9031ac564ecSJeff Layton 9041ac564ecSJeff Layton /* 9051ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9061ac564ecSJeff Layton * to interpret this in its own way. 9071ac564ecSJeff Layton */ 9081ac564ecSJeff Layton if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9091ac564ecSJeff Layton ia->ia_valid &= ~ATTR_MODE; 9101ac564ecSJeff Layton 911237fead6SMichael Halcrow rc = notify_change(lower_dentry, ia); 912237fead6SMichael Halcrow out: 9130cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(inode, lower_inode, NULL); 914237fead6SMichael Halcrow return rc; 915237fead6SMichael Halcrow } 916237fead6SMichael Halcrow 917dd2a3b7aSMichael Halcrow int 918237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 919237fead6SMichael Halcrow size_t size, int flags) 920237fead6SMichael Halcrow { 921237fead6SMichael Halcrow int rc = 0; 922237fead6SMichael Halcrow struct dentry *lower_dentry; 923237fead6SMichael Halcrow 924237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 925237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 926237fead6SMichael Halcrow rc = -ENOSYS; 927237fead6SMichael Halcrow goto out; 928237fead6SMichael Halcrow } 929237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 930237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, 931237fead6SMichael Halcrow size, flags); 932237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 933237fead6SMichael Halcrow out: 934237fead6SMichael Halcrow return rc; 935237fead6SMichael Halcrow } 936237fead6SMichael Halcrow 937dd2a3b7aSMichael Halcrow ssize_t 938d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 939d7cdc5feSMichael Halcrow void *value, size_t size) 940d7cdc5feSMichael Halcrow { 941d7cdc5feSMichael Halcrow int rc = 0; 942d7cdc5feSMichael Halcrow 943d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 944d7cdc5feSMichael Halcrow rc = -ENOSYS; 945d7cdc5feSMichael Halcrow goto out; 946d7cdc5feSMichael Halcrow } 947d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 948d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 949d7cdc5feSMichael Halcrow size); 950d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 951d7cdc5feSMichael Halcrow out: 952d7cdc5feSMichael Halcrow return rc; 953d7cdc5feSMichael Halcrow } 954d7cdc5feSMichael Halcrow 9557896b631SAdrian Bunk static ssize_t 956237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 957237fead6SMichael Halcrow size_t size) 958237fead6SMichael Halcrow { 9592ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 9602ed92554SMichael Halcrow value, size); 961237fead6SMichael Halcrow } 962237fead6SMichael Halcrow 963237fead6SMichael Halcrow static ssize_t 964237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 965237fead6SMichael Halcrow { 966237fead6SMichael Halcrow int rc = 0; 967237fead6SMichael Halcrow struct dentry *lower_dentry; 968237fead6SMichael Halcrow 969237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 970237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 971237fead6SMichael Halcrow rc = -ENOSYS; 972237fead6SMichael Halcrow goto out; 973237fead6SMichael Halcrow } 974237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 975237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 976237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 977237fead6SMichael Halcrow out: 978237fead6SMichael Halcrow return rc; 979237fead6SMichael Halcrow } 980237fead6SMichael Halcrow 981237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 982237fead6SMichael Halcrow { 983237fead6SMichael Halcrow int rc = 0; 984237fead6SMichael Halcrow struct dentry *lower_dentry; 985237fead6SMichael Halcrow 986237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 987237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 988237fead6SMichael Halcrow rc = -ENOSYS; 989237fead6SMichael Halcrow goto out; 990237fead6SMichael Halcrow } 991237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 992237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 993237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 994237fead6SMichael Halcrow out: 995237fead6SMichael Halcrow return rc; 996237fead6SMichael Halcrow } 997237fead6SMichael Halcrow 998237fead6SMichael Halcrow int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) 999237fead6SMichael Halcrow { 1000237fead6SMichael Halcrow if ((ecryptfs_inode_to_lower(inode) 1001237fead6SMichael Halcrow == (struct inode *)candidate_lower_inode)) 1002237fead6SMichael Halcrow return 1; 1003237fead6SMichael Halcrow else 1004237fead6SMichael Halcrow return 0; 1005237fead6SMichael Halcrow } 1006237fead6SMichael Halcrow 1007237fead6SMichael Halcrow int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 1008237fead6SMichael Halcrow { 1009237fead6SMichael Halcrow ecryptfs_init_inode(inode, (struct inode *)lower_inode); 1010237fead6SMichael Halcrow return 0; 1011237fead6SMichael Halcrow } 1012237fead6SMichael Halcrow 1013754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1014237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1015237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1016237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1017237fead6SMichael Halcrow .permission = ecryptfs_permission, 1018237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1019237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1020237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1021237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1022237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1023237fead6SMichael Halcrow }; 1024237fead6SMichael Halcrow 1025754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1026237fead6SMichael Halcrow .create = ecryptfs_create, 1027237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1028237fead6SMichael Halcrow .link = ecryptfs_link, 1029237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1030237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1031237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1032237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1033237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1034237fead6SMichael Halcrow .rename = ecryptfs_rename, 1035237fead6SMichael Halcrow .permission = ecryptfs_permission, 1036237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1037237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1038237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1039237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1040237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1041237fead6SMichael Halcrow }; 1042237fead6SMichael Halcrow 1043754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1044237fead6SMichael Halcrow .permission = ecryptfs_permission, 1045237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1046237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1047237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1048237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1049237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1050237fead6SMichael Halcrow }; 1051