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) { 1234981e081SMichael Halcrow struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; 1244981e081SMichael Halcrow struct ecryptfs_inode_info *inode_info = 1254981e081SMichael Halcrow ecryptfs_inode_to_private(ecryptfs_inode); 1264981e081SMichael Halcrow 1274981e081SMichael Halcrow printk(KERN_WARNING "%s: Error creating underlying file; " 1284981e081SMichael Halcrow "rc = [%d]; checking for existing\n", __FUNCTION__, rc); 1294981e081SMichael Halcrow if (inode_info) { 1304981e081SMichael Halcrow mutex_lock(&inode_info->lower_file_mutex); 1314981e081SMichael Halcrow if (!inode_info->lower_file) { 1324981e081SMichael Halcrow mutex_unlock(&inode_info->lower_file_mutex); 1334981e081SMichael Halcrow printk(KERN_ERR "%s: Failure to set underlying " 1344981e081SMichael Halcrow "file; rc = [%d]\n", __FUNCTION__, rc); 135237fead6SMichael Halcrow goto out_lock; 136237fead6SMichael Halcrow } 1374981e081SMichael Halcrow mutex_unlock(&inode_info->lower_file_mutex); 1384981e081SMichael Halcrow } 1394981e081SMichael Halcrow } 140237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 141237fead6SMichael Halcrow directory_inode->i_sb, 0); 142237fead6SMichael Halcrow if (rc) { 143237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); 144237fead6SMichael Halcrow goto out_lock; 145237fead6SMichael Halcrow } 1460cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 1470cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 148237fead6SMichael Halcrow out_lock: 149237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 150237fead6SMichael Halcrow out: 151237fead6SMichael Halcrow return rc; 152237fead6SMichael Halcrow } 153237fead6SMichael Halcrow 154237fead6SMichael Halcrow /** 155237fead6SMichael Halcrow * grow_file 156237fead6SMichael Halcrow * @ecryptfs_dentry: the ecryptfs dentry 157237fead6SMichael Halcrow * @lower_file: The lower file 158237fead6SMichael Halcrow * @inode: The ecryptfs inode 159237fead6SMichael Halcrow * @lower_inode: The lower inode 160237fead6SMichael Halcrow * 161237fead6SMichael Halcrow * This is the code which will grow the file to its correct size. 162237fead6SMichael Halcrow */ 163237fead6SMichael Halcrow static int grow_file(struct dentry *ecryptfs_dentry, struct file *lower_file, 164237fead6SMichael Halcrow struct inode *inode, struct inode *lower_inode) 165237fead6SMichael Halcrow { 166237fead6SMichael Halcrow int rc = 0; 167237fead6SMichael Halcrow struct file fake_file; 168237fead6SMichael Halcrow struct ecryptfs_file_info tmp_file_info; 169237fead6SMichael Halcrow 170237fead6SMichael Halcrow memset(&fake_file, 0, sizeof(fake_file)); 171bd243a4bSJosef "Jeff" Sipek fake_file.f_path.dentry = ecryptfs_dentry; 172237fead6SMichael Halcrow memset(&tmp_file_info, 0, sizeof(tmp_file_info)); 173237fead6SMichael Halcrow ecryptfs_set_file_private(&fake_file, &tmp_file_info); 174237fead6SMichael Halcrow ecryptfs_set_file_lower(&fake_file, lower_file); 175237fead6SMichael Halcrow rc = ecryptfs_fill_zeros(&fake_file, 1); 176237fead6SMichael Halcrow if (rc) { 177e2bd99ecSMichael Halcrow ecryptfs_inode_to_private(inode)->crypt_stat.flags |= 178e2bd99ecSMichael Halcrow ECRYPTFS_SECURITY_WARNING; 179237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Error attempting to fill zeros " 180237fead6SMichael Halcrow "in file; rc = [%d]\n", rc); 181237fead6SMichael Halcrow goto out; 182237fead6SMichael Halcrow } 183237fead6SMichael Halcrow i_size_write(inode, 0); 1840216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 185e2bd99ecSMichael Halcrow ecryptfs_inode_to_private(inode)->crypt_stat.flags |= ECRYPTFS_NEW_FILE; 186237fead6SMichael Halcrow out: 187237fead6SMichael Halcrow return rc; 188237fead6SMichael Halcrow } 189237fead6SMichael Halcrow 190237fead6SMichael Halcrow /** 191237fead6SMichael Halcrow * ecryptfs_initialize_file 192237fead6SMichael Halcrow * 193237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 194237fead6SMichael Halcrow * file with a header and first data page. 195237fead6SMichael Halcrow * 196237fead6SMichael Halcrow * Returns zero on success 197237fead6SMichael Halcrow */ 198237fead6SMichael Halcrow static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) 199237fead6SMichael Halcrow { 200237fead6SMichael Halcrow int rc = 0; 201237fead6SMichael Halcrow int lower_flags; 202237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 203237fead6SMichael Halcrow struct dentry *lower_dentry; 204237fead6SMichael Halcrow struct file *lower_file; 205237fead6SMichael Halcrow struct inode *inode, *lower_inode; 206237fead6SMichael Halcrow struct vfsmount *lower_mnt; 207237fead6SMichael Halcrow 208237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 209237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "lower_dentry->d_name.name = [%s]\n", 210237fead6SMichael Halcrow lower_dentry->d_name.name); 211237fead6SMichael Halcrow inode = ecryptfs_dentry->d_inode; 212237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 21370456600SMichael Halcrow lower_flags = ((O_CREAT | O_TRUNC) & O_ACCMODE) | O_RDWR; 214237fead6SMichael Halcrow lower_mnt = ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry); 215237fead6SMichael Halcrow /* Corresponding fput() at end of this function */ 2165dda6992SMichael Halcrow rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt, 2175dda6992SMichael Halcrow lower_flags); 2185dda6992SMichael Halcrow if (rc) { 219237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, 220237fead6SMichael Halcrow "Error opening dentry; rc = [%i]\n", rc); 221237fead6SMichael Halcrow goto out; 222237fead6SMichael Halcrow } 2237ff1d74fSMichael Halcrow lower_inode = lower_dentry->d_inode; 224237fead6SMichael Halcrow if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { 225237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 226e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 227237fead6SMichael Halcrow goto out_fput; 228237fead6SMichael Halcrow } 229e2bd99ecSMichael Halcrow crypt_stat->flags |= ECRYPTFS_NEW_FILE; 230237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 231237fead6SMichael Halcrow rc = ecryptfs_new_file_context(ecryptfs_dentry); 232237fead6SMichael Halcrow if (rc) { 233237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Error creating new file " 234237fead6SMichael Halcrow "context\n"); 235237fead6SMichael Halcrow goto out_fput; 236237fead6SMichael Halcrow } 237dd2a3b7aSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry, lower_file); 238237fead6SMichael Halcrow if (rc) { 239237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Error writing headers\n"); 240237fead6SMichael Halcrow goto out_fput; 241237fead6SMichael Halcrow } 242237fead6SMichael Halcrow rc = grow_file(ecryptfs_dentry, lower_file, inode, lower_inode); 243237fead6SMichael Halcrow out_fput: 2445dda6992SMichael Halcrow rc = ecryptfs_close_lower_file(lower_file); 2455dda6992SMichael Halcrow if (rc) 2467ff1d74fSMichael Halcrow printk(KERN_ERR "Error closing lower_file\n"); 247237fead6SMichael Halcrow out: 248237fead6SMichael Halcrow return rc; 249237fead6SMichael Halcrow } 250237fead6SMichael Halcrow 251237fead6SMichael Halcrow /** 252237fead6SMichael Halcrow * ecryptfs_create 253237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 254237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 255237fead6SMichael Halcrow * @mode: The mode of the new file. 256237fead6SMichael Halcrow * @nd: nameidata 257237fead6SMichael Halcrow * 258237fead6SMichael Halcrow * Creates a new file. 259237fead6SMichael Halcrow * 260237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 261237fead6SMichael Halcrow */ 262237fead6SMichael Halcrow static int 263237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 264237fead6SMichael Halcrow int mode, struct nameidata *nd) 265237fead6SMichael Halcrow { 266237fead6SMichael Halcrow int rc; 267237fead6SMichael Halcrow 2684981e081SMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose(), which opens 2694981e081SMichael Halcrow * the crypt_stat->lower_file (persistent file) */ 270237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 271237fead6SMichael Halcrow if (unlikely(rc)) { 272237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 273237fead6SMichael Halcrow "lower filesystem\n"); 274237fead6SMichael Halcrow goto out; 275237fead6SMichael Halcrow } 276237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 277237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 278237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 279237fead6SMichael Halcrow out: 280237fead6SMichael Halcrow return rc; 281237fead6SMichael Halcrow } 282237fead6SMichael Halcrow 283237fead6SMichael Halcrow /** 284237fead6SMichael Halcrow * ecryptfs_lookup 285237fead6SMichael Halcrow * @dir: inode 286237fead6SMichael Halcrow * @dentry: The dentry 287237fead6SMichael Halcrow * @nd: nameidata, may be NULL 288237fead6SMichael Halcrow * 289237fead6SMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 290237fead6SMichael Halcrow * dentry cache and continue on to read it from the disk. 291237fead6SMichael Halcrow */ 292237fead6SMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, 293237fead6SMichael Halcrow struct nameidata *nd) 294237fead6SMichael Halcrow { 295237fead6SMichael Halcrow int rc = 0; 296237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 297237fead6SMichael Halcrow struct dentry *lower_dentry; 298237fead6SMichael Halcrow struct vfsmount *lower_mnt; 299237fead6SMichael Halcrow char *encoded_name; 300c381bfcfSMika Kukkonen int encoded_namelen; 301237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = NULL; 302e77a56ddSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 303237fead6SMichael Halcrow char *page_virt = NULL; 304237fead6SMichael Halcrow struct inode *lower_inode; 305237fead6SMichael Halcrow u64 file_size; 306237fead6SMichael Halcrow 307237fead6SMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); 308237fead6SMichael Halcrow dentry->d_op = &ecryptfs_dops; 309237fead6SMichael Halcrow if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, ".")) 31045ec4abaSMichael Halcrow || (dentry->d_name.len == 2 31145ec4abaSMichael Halcrow && !strcmp(dentry->d_name.name, ".."))) { 31245ec4abaSMichael Halcrow d_drop(dentry); 31345ec4abaSMichael Halcrow goto out; 31445ec4abaSMichael Halcrow } 315237fead6SMichael Halcrow encoded_namelen = ecryptfs_encode_filename(crypt_stat, 316237fead6SMichael Halcrow dentry->d_name.name, 317237fead6SMichael Halcrow dentry->d_name.len, 318237fead6SMichael Halcrow &encoded_name); 319237fead6SMichael Halcrow if (encoded_namelen < 0) { 320237fead6SMichael Halcrow rc = encoded_namelen; 32145ec4abaSMichael Halcrow d_drop(dentry); 32245ec4abaSMichael Halcrow goto out; 323237fead6SMichael Halcrow } 324237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen " 325237fead6SMichael Halcrow "= [%d]\n", encoded_name, encoded_namelen); 326237fead6SMichael Halcrow lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry, 327237fead6SMichael Halcrow encoded_namelen - 1); 328237fead6SMichael Halcrow kfree(encoded_name); 329237fead6SMichael Halcrow if (IS_ERR(lower_dentry)) { 330237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n"); 331237fead6SMichael Halcrow rc = PTR_ERR(lower_dentry); 33245ec4abaSMichael Halcrow d_drop(dentry); 33345ec4abaSMichael Halcrow goto out; 334237fead6SMichael Halcrow } 33545ec4abaSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 336237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->" 337237fead6SMichael Halcrow "d_name.name = [%s]\n", lower_dentry, 338237fead6SMichael Halcrow lower_dentry->d_name.name); 339237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 3400cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_atime(dir, lower_dir_dentry->d_inode); 341237fead6SMichael Halcrow BUG_ON(!atomic_read(&lower_dentry->d_count)); 342237fead6SMichael Halcrow ecryptfs_set_dentry_private(dentry, 343237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 344e94b1766SChristoph Lameter GFP_KERNEL)); 345237fead6SMichael Halcrow if (!ecryptfs_dentry_to_private(dentry)) { 346237fead6SMichael Halcrow rc = -ENOMEM; 347237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting " 348237fead6SMichael Halcrow "to allocate ecryptfs_dentry_info struct\n"); 349237fead6SMichael Halcrow goto out_dput; 350237fead6SMichael Halcrow } 351237fead6SMichael Halcrow ecryptfs_set_dentry_lower(dentry, lower_dentry); 352237fead6SMichael Halcrow ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); 353237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 354237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 355237fead6SMichael Halcrow d_add(dentry, NULL); 356237fead6SMichael Halcrow goto out; 357237fead6SMichael Halcrow } 358237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1); 359237fead6SMichael Halcrow if (rc) { 360237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error interposing\n"); 361237fead6SMichael Halcrow goto out_dput; 362237fead6SMichael Halcrow } 363237fead6SMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) { 364237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n"); 365237fead6SMichael Halcrow goto out; 366237fead6SMichael Halcrow } 367237fead6SMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) { 368237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n"); 369237fead6SMichael Halcrow goto out; 370237fead6SMichael Halcrow } 371202a21d6SRyusuke Konishi if (special_file(lower_inode->i_mode)) { 372202a21d6SRyusuke Konishi ecryptfs_printk(KERN_DEBUG, "Is a special file; returning\n"); 373202a21d6SRyusuke Konishi goto out; 374202a21d6SRyusuke Konishi } 375237fead6SMichael Halcrow if (!nd) { 376237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave" 377237fead6SMichael Halcrow "as we *think* we are about to unlink\n"); 378237fead6SMichael Halcrow goto out; 379237fead6SMichael Halcrow } 380237fead6SMichael Halcrow /* Released in this function */ 381c3762229SRobert P. J. Day page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, 382f7267c0cSChristoph Lameter GFP_USER); 383237fead6SMichael Halcrow if (!page_virt) { 384237fead6SMichael Halcrow rc = -ENOMEM; 385237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, 386237fead6SMichael Halcrow "Cannot ecryptfs_kmalloc a page\n"); 387237fead6SMichael Halcrow goto out_dput; 388237fead6SMichael Halcrow } 389237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 390e2bd99ecSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 391237fead6SMichael Halcrow ecryptfs_set_default_sizes(crypt_stat); 392dd2a3b7aSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, lower_dentry, 393dd2a3b7aSMichael Halcrow nd->mnt); 394237fead6SMichael Halcrow if (rc) { 395dd2a3b7aSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, dentry); 396dd2a3b7aSMichael Halcrow if (rc) { 397dd2a3b7aSMichael Halcrow printk(KERN_DEBUG "Valid metadata not found in header " 398dd2a3b7aSMichael Halcrow "region or xattr region; treating file as " 399dd2a3b7aSMichael Halcrow "unencrypted\n"); 400237fead6SMichael Halcrow rc = 0; 401237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 402237fead6SMichael Halcrow goto out; 403237fead6SMichael Halcrow } 404dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 405dd2a3b7aSMichael Halcrow } 406e77a56ddSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 407e77a56ddSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 408e77a56ddSMichael Halcrow if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { 409e77a56ddSMichael Halcrow if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 41045eaab79SMichael Halcrow file_size = ((crypt_stat->extent_size 41145eaab79SMichael Halcrow * crypt_stat->num_header_extents_at_front) 412e77a56ddSMichael Halcrow + i_size_read(lower_dentry->d_inode)); 413e77a56ddSMichael Halcrow else 414e77a56ddSMichael Halcrow file_size = i_size_read(lower_dentry->d_inode); 415e77a56ddSMichael Halcrow } else { 416237fead6SMichael Halcrow memcpy(&file_size, page_virt, sizeof(file_size)); 417237fead6SMichael Halcrow file_size = be64_to_cpu(file_size); 418e77a56ddSMichael Halcrow } 419237fead6SMichael Halcrow i_size_write(dentry->d_inode, (loff_t)file_size); 420237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 421237fead6SMichael Halcrow goto out; 422237fead6SMichael Halcrow 423237fead6SMichael Halcrow out_dput: 424237fead6SMichael Halcrow dput(lower_dentry); 425237fead6SMichael Halcrow d_drop(dentry); 426237fead6SMichael Halcrow out: 427237fead6SMichael Halcrow return ERR_PTR(rc); 428237fead6SMichael Halcrow } 429237fead6SMichael Halcrow 430237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 431237fead6SMichael Halcrow struct dentry *new_dentry) 432237fead6SMichael Halcrow { 433237fead6SMichael Halcrow struct dentry *lower_old_dentry; 434237fead6SMichael Halcrow struct dentry *lower_new_dentry; 435237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 436237fead6SMichael Halcrow u64 file_size_save; 437237fead6SMichael Halcrow int rc; 438237fead6SMichael Halcrow 439237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 440237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 441237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 442237fead6SMichael Halcrow dget(lower_old_dentry); 443237fead6SMichael Halcrow dget(lower_new_dentry); 444237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 445237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 446237fead6SMichael Halcrow lower_new_dentry); 447237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 448237fead6SMichael Halcrow goto out_lock; 449237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 450237fead6SMichael Halcrow if (rc) 451237fead6SMichael Halcrow goto out_lock; 4520cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); 4530cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); 454237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 455237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 456237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 457237fead6SMichael Halcrow out_lock: 458237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 459237fead6SMichael Halcrow dput(lower_new_dentry); 460237fead6SMichael Halcrow dput(lower_old_dentry); 461ae56fb16SMichael Halcrow d_drop(lower_old_dentry); 462237fead6SMichael Halcrow d_drop(new_dentry); 46345ec4abaSMichael Halcrow d_drop(old_dentry); 464237fead6SMichael Halcrow return rc; 465237fead6SMichael Halcrow } 466237fead6SMichael Halcrow 467237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 468237fead6SMichael Halcrow { 469237fead6SMichael Halcrow int rc = 0; 470237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 471237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 472237fead6SMichael Halcrow 473237fead6SMichael Halcrow lock_parent(lower_dentry); 474237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 475237fead6SMichael Halcrow if (rc) { 476ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 477237fead6SMichael Halcrow goto out_unlock; 478237fead6SMichael Halcrow } 4790cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 480237fead6SMichael Halcrow dentry->d_inode->i_nlink = 481237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 482237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 483237fead6SMichael Halcrow out_unlock: 484237fead6SMichael Halcrow unlock_parent(lower_dentry); 485237fead6SMichael Halcrow return rc; 486237fead6SMichael Halcrow } 487237fead6SMichael Halcrow 488237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 489237fead6SMichael Halcrow const char *symname) 490237fead6SMichael Halcrow { 491237fead6SMichael Halcrow int rc; 492237fead6SMichael Halcrow struct dentry *lower_dentry; 493237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 494237fead6SMichael Halcrow umode_t mode; 495237fead6SMichael Halcrow char *encoded_symname; 496c381bfcfSMika Kukkonen int encoded_symlen; 497237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = NULL; 498237fead6SMichael Halcrow 499237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 500237fead6SMichael Halcrow dget(lower_dentry); 501237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 502237fead6SMichael Halcrow mode = S_IALLUGO; 503237fead6SMichael Halcrow encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname, 504237fead6SMichael Halcrow strlen(symname), 505237fead6SMichael Halcrow &encoded_symname); 506237fead6SMichael Halcrow if (encoded_symlen < 0) { 507237fead6SMichael Halcrow rc = encoded_symlen; 508237fead6SMichael Halcrow goto out_lock; 509237fead6SMichael Halcrow } 510237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 511237fead6SMichael Halcrow encoded_symname, mode); 512237fead6SMichael Halcrow kfree(encoded_symname); 513237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 514237fead6SMichael Halcrow goto out_lock; 515237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 516237fead6SMichael Halcrow if (rc) 517237fead6SMichael Halcrow goto out_lock; 5180cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5190cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 520237fead6SMichael Halcrow out_lock: 521237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 522237fead6SMichael Halcrow dput(lower_dentry); 523237fead6SMichael Halcrow if (!dentry->d_inode) 524237fead6SMichael Halcrow d_drop(dentry); 525237fead6SMichael Halcrow return rc; 526237fead6SMichael Halcrow } 527237fead6SMichael Halcrow 528237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 529237fead6SMichael Halcrow { 530237fead6SMichael Halcrow int rc; 531237fead6SMichael Halcrow struct dentry *lower_dentry; 532237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 533237fead6SMichael Halcrow 534237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 535237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 536237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 537237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 538237fead6SMichael Halcrow goto out; 539237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 540237fead6SMichael Halcrow if (rc) 541237fead6SMichael Halcrow goto out; 5420cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5430cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 544237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 545237fead6SMichael Halcrow out: 546237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 547237fead6SMichael Halcrow if (!dentry->d_inode) 548237fead6SMichael Halcrow d_drop(dentry); 549237fead6SMichael Halcrow return rc; 550237fead6SMichael Halcrow } 551237fead6SMichael Halcrow 552237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 553237fead6SMichael Halcrow { 554237fead6SMichael Halcrow struct dentry *lower_dentry; 555237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 55645ec4abaSMichael Halcrow int rc; 557237fead6SMichael Halcrow 558237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 55945ec4abaSMichael Halcrow dget(dentry); 560237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 56145ec4abaSMichael Halcrow dget(lower_dentry); 562237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 56345ec4abaSMichael Halcrow dput(lower_dentry); 56445ec4abaSMichael Halcrow if (!rc) 56545ec4abaSMichael Halcrow d_delete(lower_dentry); 5660cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 567237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 568237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 569237fead6SMichael Halcrow if (!rc) 570237fead6SMichael Halcrow d_drop(dentry); 57145ec4abaSMichael Halcrow dput(dentry); 572237fead6SMichael Halcrow return rc; 573237fead6SMichael Halcrow } 574237fead6SMichael Halcrow 575237fead6SMichael Halcrow static int 576237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 577237fead6SMichael Halcrow { 578237fead6SMichael Halcrow int rc; 579237fead6SMichael Halcrow struct dentry *lower_dentry; 580237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 581237fead6SMichael Halcrow 582237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 583237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 584237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 585237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 586237fead6SMichael Halcrow goto out; 587237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 588237fead6SMichael Halcrow if (rc) 589237fead6SMichael Halcrow goto out; 5900cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5910cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 592237fead6SMichael Halcrow out: 593237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 594237fead6SMichael Halcrow if (!dentry->d_inode) 595237fead6SMichael Halcrow d_drop(dentry); 596237fead6SMichael Halcrow return rc; 597237fead6SMichael Halcrow } 598237fead6SMichael Halcrow 599237fead6SMichael Halcrow static int 600237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 601237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 602237fead6SMichael Halcrow { 603237fead6SMichael Halcrow int rc; 604237fead6SMichael Halcrow struct dentry *lower_old_dentry; 605237fead6SMichael Halcrow struct dentry *lower_new_dentry; 606237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 607237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 608237fead6SMichael Halcrow 609237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 610237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 611237fead6SMichael Halcrow dget(lower_old_dentry); 612237fead6SMichael Halcrow dget(lower_new_dentry); 613237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 614237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 615237fead6SMichael Halcrow lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 616237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 617237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 618237fead6SMichael Halcrow if (rc) 619237fead6SMichael Halcrow goto out_lock; 6200cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL); 621237fead6SMichael Halcrow if (new_dir != old_dir) 6220cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL); 623237fead6SMichael Halcrow out_lock: 624237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 625a9083081SMichael Halcrow dput(lower_new_dentry->d_parent); 626a9083081SMichael Halcrow dput(lower_old_dentry->d_parent); 627237fead6SMichael Halcrow dput(lower_new_dentry); 628237fead6SMichael Halcrow dput(lower_old_dentry); 629237fead6SMichael Halcrow return rc; 630237fead6SMichael Halcrow } 631237fead6SMichael Halcrow 632237fead6SMichael Halcrow static int 633237fead6SMichael Halcrow ecryptfs_readlink(struct dentry *dentry, char __user * buf, int bufsiz) 634237fead6SMichael Halcrow { 635237fead6SMichael Halcrow int rc; 636237fead6SMichael Halcrow struct dentry *lower_dentry; 637237fead6SMichael Halcrow char *decoded_name; 638237fead6SMichael Halcrow char *lower_buf; 639237fead6SMichael Halcrow mm_segment_t old_fs; 640237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 641237fead6SMichael Halcrow 642237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 643237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op || 644237fead6SMichael Halcrow !lower_dentry->d_inode->i_op->readlink) { 645237fead6SMichael Halcrow rc = -EINVAL; 646237fead6SMichael Halcrow goto out; 647237fead6SMichael Halcrow } 648237fead6SMichael Halcrow /* Released in this function */ 649237fead6SMichael Halcrow lower_buf = kmalloc(bufsiz, GFP_KERNEL); 650237fead6SMichael Halcrow if (lower_buf == NULL) { 651237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Out of memory\n"); 652237fead6SMichael Halcrow rc = -ENOMEM; 653237fead6SMichael Halcrow goto out; 654237fead6SMichael Halcrow } 655237fead6SMichael Halcrow old_fs = get_fs(); 656237fead6SMichael Halcrow set_fs(get_ds()); 657237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " 658237fead6SMichael Halcrow "lower_dentry->d_name.name = [%s]\n", 659237fead6SMichael Halcrow lower_dentry->d_name.name); 660237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 661237fead6SMichael Halcrow (char __user *)lower_buf, 662237fead6SMichael Halcrow bufsiz); 663237fead6SMichael Halcrow set_fs(old_fs); 664237fead6SMichael Halcrow if (rc >= 0) { 665237fead6SMichael Halcrow crypt_stat = NULL; 666237fead6SMichael Halcrow rc = ecryptfs_decode_filename(crypt_stat, lower_buf, rc, 667237fead6SMichael Halcrow &decoded_name); 668237fead6SMichael Halcrow if (rc == -ENOMEM) 669237fead6SMichael Halcrow goto out_free_lower_buf; 670237fead6SMichael Halcrow if (rc > 0) { 671237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Copying [%d] bytes " 672237fead6SMichael Halcrow "to userspace: [%*s]\n", rc, 673237fead6SMichael Halcrow decoded_name); 674237fead6SMichael Halcrow if (copy_to_user(buf, decoded_name, rc)) 675237fead6SMichael Halcrow rc = -EFAULT; 676237fead6SMichael Halcrow } 677237fead6SMichael Halcrow kfree(decoded_name); 6780cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_atime(dentry->d_inode, 679237fead6SMichael Halcrow lower_dentry->d_inode); 680237fead6SMichael Halcrow } 681237fead6SMichael Halcrow out_free_lower_buf: 682237fead6SMichael Halcrow kfree(lower_buf); 683237fead6SMichael Halcrow out: 684237fead6SMichael Halcrow return rc; 685237fead6SMichael Halcrow } 686237fead6SMichael Halcrow 687237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 688237fead6SMichael Halcrow { 689237fead6SMichael Halcrow char *buf; 690237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 691237fead6SMichael Halcrow mm_segment_t old_fs; 692237fead6SMichael Halcrow 693237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 694237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 695237fead6SMichael Halcrow if (!buf) { 696237fead6SMichael Halcrow rc = -ENOMEM; 697237fead6SMichael Halcrow goto out; 698237fead6SMichael Halcrow } 699237fead6SMichael Halcrow old_fs = get_fs(); 700237fead6SMichael Halcrow set_fs(get_ds()); 701237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " 702237fead6SMichael Halcrow "dentry->d_name.name = [%s]\n", dentry->d_name.name); 703237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 704237fead6SMichael Halcrow buf[rc] = '\0'; 705237fead6SMichael Halcrow set_fs(old_fs); 706237fead6SMichael Halcrow if (rc < 0) 707237fead6SMichael Halcrow goto out_free; 708237fead6SMichael Halcrow rc = 0; 709237fead6SMichael Halcrow nd_set_link(nd, buf); 710237fead6SMichael Halcrow goto out; 711237fead6SMichael Halcrow out_free: 712237fead6SMichael Halcrow kfree(buf); 713237fead6SMichael Halcrow out: 714237fead6SMichael Halcrow return ERR_PTR(rc); 715237fead6SMichael Halcrow } 716237fead6SMichael Halcrow 717237fead6SMichael Halcrow static void 718237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 719237fead6SMichael Halcrow { 720237fead6SMichael Halcrow /* Free the char* */ 721237fead6SMichael Halcrow kfree(nd_get_link(nd)); 722237fead6SMichael Halcrow } 723237fead6SMichael Halcrow 724237fead6SMichael Halcrow /** 725237fead6SMichael Halcrow * upper_size_to_lower_size 726237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 727237fead6SMichael Halcrow * @upper_size: Size of the upper file 728237fead6SMichael Halcrow * 729237fead6SMichael Halcrow * Calculate the requried size of the lower file based on the 730237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 731237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 732237fead6SMichael Halcrow * 733237fead6SMichael Halcrow * Returns Calculated size of the lower file. 734237fead6SMichael Halcrow */ 735237fead6SMichael Halcrow static loff_t 736237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 737237fead6SMichael Halcrow loff_t upper_size) 738237fead6SMichael Halcrow { 739237fead6SMichael Halcrow loff_t lower_size; 740237fead6SMichael Halcrow 74145eaab79SMichael Halcrow lower_size = (crypt_stat->extent_size 742237fead6SMichael Halcrow * crypt_stat->num_header_extents_at_front); 743237fead6SMichael Halcrow if (upper_size != 0) { 744237fead6SMichael Halcrow loff_t num_extents; 745237fead6SMichael Halcrow 746237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 747237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 748237fead6SMichael Halcrow num_extents++; 749237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 750237fead6SMichael Halcrow } 751237fead6SMichael Halcrow return lower_size; 752237fead6SMichael Halcrow } 753237fead6SMichael Halcrow 754237fead6SMichael Halcrow /** 755237fead6SMichael Halcrow * ecryptfs_truncate 756237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 757237fead6SMichael Halcrow * @new_length: The length to expand the file to 758237fead6SMichael Halcrow * 759237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 760237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 761237fead6SMichael Halcrow * writing strings of 0's out. When truncating, we need to modify the 762237fead6SMichael Halcrow * underlying file size according to the page index interpolations. 763237fead6SMichael Halcrow * 764237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 765237fead6SMichael Halcrow */ 766237fead6SMichael Halcrow int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 767237fead6SMichael Halcrow { 768237fead6SMichael Halcrow int rc = 0; 769237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 770237fead6SMichael Halcrow struct dentry *lower_dentry; 771237fead6SMichael Halcrow struct vfsmount *lower_mnt; 772237fead6SMichael Halcrow struct file fake_ecryptfs_file, *lower_file = NULL; 773237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 774237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 775237fead6SMichael Halcrow loff_t lower_size_before_truncate; 776237fead6SMichael Halcrow loff_t lower_size_after_truncate; 777237fead6SMichael Halcrow 778237fead6SMichael Halcrow if (unlikely((new_length == i_size))) 779237fead6SMichael Halcrow goto out; 780237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 781237fead6SMichael Halcrow /* Set up a fake ecryptfs file, this is used to interface with 782237fead6SMichael Halcrow * the file in the underlying filesystem so that the 783237fead6SMichael Halcrow * truncation has an effect there as well. */ 784237fead6SMichael Halcrow memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); 785bd243a4bSJosef "Jeff" Sipek fake_ecryptfs_file.f_path.dentry = dentry; 786237fead6SMichael Halcrow /* Released at out_free: label */ 787237fead6SMichael Halcrow ecryptfs_set_file_private(&fake_ecryptfs_file, 788237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_file_info_cache, 789e94b1766SChristoph Lameter GFP_KERNEL)); 790237fead6SMichael Halcrow if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { 791237fead6SMichael Halcrow rc = -ENOMEM; 792237fead6SMichael Halcrow goto out; 793237fead6SMichael Halcrow } 794237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 795237fead6SMichael Halcrow /* This dget & mntget is released through fput at out_fput: */ 796237fead6SMichael Halcrow lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); 7975dda6992SMichael Halcrow rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt, 7985dda6992SMichael Halcrow O_RDWR); 7995dda6992SMichael Halcrow if (rc) { 8007ff1d74fSMichael Halcrow ecryptfs_printk(KERN_ERR, 8017ff1d74fSMichael Halcrow "Error opening dentry; rc = [%i]\n", rc); 802237fead6SMichael Halcrow goto out_free; 803237fead6SMichael Halcrow } 804237fead6SMichael Halcrow ecryptfs_set_file_lower(&fake_ecryptfs_file, lower_file); 805237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 806237fead6SMichael Halcrow if (new_length > i_size) { 807237fead6SMichael Halcrow rc = ecryptfs_fill_zeros(&fake_ecryptfs_file, new_length); 808237fead6SMichael Halcrow if (rc) { 809237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, 810237fead6SMichael Halcrow "Problem with fill_zeros\n"); 811237fead6SMichael Halcrow goto out_fput; 812237fead6SMichael Halcrow } 813237fead6SMichael Halcrow i_size_write(inode, new_length); 8140216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 815237fead6SMichael Halcrow if (rc) { 816dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 817dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 818dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 819237fead6SMichael Halcrow goto out_fput; 820237fead6SMichael Halcrow } 821237fead6SMichael Halcrow } else { /* new_length < i_size_read(inode) */ 822240e2df5SMichael Halcrow pgoff_t index = 0; 823240e2df5SMichael Halcrow int end_pos_in_page = -1; 824240e2df5SMichael Halcrow 825240e2df5SMichael Halcrow if (new_length != 0) { 826240e2df5SMichael Halcrow index = ((new_length - 1) >> PAGE_CACHE_SHIFT); 827240e2df5SMichael Halcrow end_pos_in_page = ((new_length - 1) & ~PAGE_CACHE_MASK); 828240e2df5SMichael Halcrow } 829240e2df5SMichael Halcrow if (end_pos_in_page != (PAGE_CACHE_SIZE - 1)) { 8305dda6992SMichael Halcrow rc = ecryptfs_write_zeros(&fake_ecryptfs_file, 831240e2df5SMichael Halcrow index, 832240e2df5SMichael Halcrow (end_pos_in_page + 1), 833240e2df5SMichael Halcrow ((PAGE_CACHE_SIZE - 1) 8345dda6992SMichael Halcrow - end_pos_in_page)); 8355dda6992SMichael Halcrow if (rc) { 836240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 837240e2df5SMichael Halcrow "the remainder of the end page on " 838240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 839240e2df5SMichael Halcrow goto out_fput; 840240e2df5SMichael Halcrow } 841240e2df5SMichael Halcrow } 842237fead6SMichael Halcrow vmtruncate(inode, new_length); 8430216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 844dd2a3b7aSMichael Halcrow if (rc) { 845dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 846dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 847dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 848dd2a3b7aSMichael Halcrow goto out_fput; 849dd2a3b7aSMichael Halcrow } 850237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 851237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 852237fead6SMichael Halcrow lower_size_before_truncate = 853237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 854237fead6SMichael Halcrow lower_size_after_truncate = 855237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, new_length); 856237fead6SMichael Halcrow if (lower_size_after_truncate < lower_size_before_truncate) 857237fead6SMichael Halcrow vmtruncate(lower_dentry->d_inode, 858237fead6SMichael Halcrow lower_size_after_truncate); 859237fead6SMichael Halcrow } 860237fead6SMichael Halcrow /* Update the access times */ 861237fead6SMichael Halcrow lower_dentry->d_inode->i_mtime = lower_dentry->d_inode->i_ctime 862237fead6SMichael Halcrow = CURRENT_TIME; 863237fead6SMichael Halcrow mark_inode_dirty_sync(inode); 864237fead6SMichael Halcrow out_fput: 8655dda6992SMichael Halcrow rc = ecryptfs_close_lower_file(lower_file); 8665dda6992SMichael Halcrow if (rc) 8677ff1d74fSMichael Halcrow printk(KERN_ERR "Error closing lower_file\n"); 868237fead6SMichael Halcrow out_free: 869237fead6SMichael Halcrow if (ecryptfs_file_to_private(&fake_ecryptfs_file)) 870237fead6SMichael Halcrow kmem_cache_free(ecryptfs_file_info_cache, 871237fead6SMichael Halcrow ecryptfs_file_to_private(&fake_ecryptfs_file)); 872237fead6SMichael Halcrow out: 873237fead6SMichael Halcrow return rc; 874237fead6SMichael Halcrow } 875237fead6SMichael Halcrow 876237fead6SMichael Halcrow static int 877237fead6SMichael Halcrow ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd) 878237fead6SMichael Halcrow { 879237fead6SMichael Halcrow int rc; 880237fead6SMichael Halcrow 881237fead6SMichael Halcrow if (nd) { 882237fead6SMichael Halcrow struct vfsmount *vfsmnt_save = nd->mnt; 883237fead6SMichael Halcrow struct dentry *dentry_save = nd->dentry; 884237fead6SMichael Halcrow 885237fead6SMichael Halcrow nd->mnt = ecryptfs_dentry_to_lower_mnt(nd->dentry); 886237fead6SMichael Halcrow nd->dentry = ecryptfs_dentry_to_lower(nd->dentry); 887237fead6SMichael Halcrow rc = permission(ecryptfs_inode_to_lower(inode), mask, nd); 888237fead6SMichael Halcrow nd->mnt = vfsmnt_save; 889237fead6SMichael Halcrow nd->dentry = dentry_save; 890237fead6SMichael Halcrow } else 891237fead6SMichael Halcrow rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL); 892237fead6SMichael Halcrow return rc; 893237fead6SMichael Halcrow } 894237fead6SMichael Halcrow 895237fead6SMichael Halcrow /** 896237fead6SMichael Halcrow * ecryptfs_setattr 897237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 898237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 899237fead6SMichael Halcrow * 900237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 901237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 902237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 903237fead6SMichael Halcrow * 904237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 905237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 906237fead6SMichael Halcrow */ 907237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 908237fead6SMichael Halcrow { 909237fead6SMichael Halcrow int rc = 0; 910237fead6SMichael Halcrow struct dentry *lower_dentry; 911237fead6SMichael Halcrow struct inode *inode; 912237fead6SMichael Halcrow struct inode *lower_inode; 913237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 914237fead6SMichael Halcrow 915237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 916e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 917e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 918237fead6SMichael Halcrow inode = dentry->d_inode; 919237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 920e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 921e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 922e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 923e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 92464ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 92564ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 92664ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 927e10f281bSMichael Halcrow struct vfsmount *lower_mnt; 928e10f281bSMichael Halcrow struct file *lower_file = NULL; 929e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 930e10f281bSMichael Halcrow int lower_flags; 931e10f281bSMichael Halcrow 932e10f281bSMichael Halcrow lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); 933e10f281bSMichael Halcrow lower_flags = O_RDONLY; 9345dda6992SMichael Halcrow rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, 9355dda6992SMichael Halcrow lower_mnt, lower_flags); 9365dda6992SMichael Halcrow if (rc) { 937e10f281bSMichael Halcrow printk(KERN_ERR 938e10f281bSMichael Halcrow "Error opening lower file; rc = [%d]\n", rc); 939e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 940e10f281bSMichael Halcrow goto out; 941e10f281bSMichael Halcrow } 942e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 943e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9445dda6992SMichael Halcrow rc = ecryptfs_read_metadata(dentry, lower_file); 9455dda6992SMichael Halcrow if (rc) { 946e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 947e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 948e10f281bSMichael Halcrow rc = -EIO; 949e10f281bSMichael Halcrow printk(KERN_WARNING "Attempt to read file that " 950e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 951e10f281bSMichael Halcrow "and plaintext passthrough mode is not " 952e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 953e10f281bSMichael Halcrow 954e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 955e10f281bSMichael Halcrow fput(lower_file); 956e10f281bSMichael Halcrow goto out; 957e10f281bSMichael Halcrow } 958e10f281bSMichael Halcrow rc = 0; 959e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 960e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 961e10f281bSMichael Halcrow fput(lower_file); 962e10f281bSMichael Halcrow goto out; 963e10f281bSMichael Halcrow } 964e10f281bSMichael Halcrow fput(lower_file); 965e10f281bSMichael Halcrow } 966e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 967237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 968237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, 969237fead6SMichael Halcrow "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", 970237fead6SMichael Halcrow ia->ia_valid, ATTR_SIZE); 971237fead6SMichael Halcrow rc = ecryptfs_truncate(dentry, ia->ia_size); 972237fead6SMichael Halcrow /* ecryptfs_truncate handles resizing of the lower file */ 973237fead6SMichael Halcrow ia->ia_valid &= ~ATTR_SIZE; 974237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n", 975237fead6SMichael Halcrow ia->ia_valid); 976237fead6SMichael Halcrow if (rc < 0) 977237fead6SMichael Halcrow goto out; 978237fead6SMichael Halcrow } 979237fead6SMichael Halcrow rc = notify_change(lower_dentry, ia); 980237fead6SMichael Halcrow out: 9810cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(inode, lower_inode, NULL); 982237fead6SMichael Halcrow return rc; 983237fead6SMichael Halcrow } 984237fead6SMichael Halcrow 985dd2a3b7aSMichael Halcrow int 986237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 987237fead6SMichael Halcrow size_t size, int flags) 988237fead6SMichael Halcrow { 989237fead6SMichael Halcrow int rc = 0; 990237fead6SMichael Halcrow struct dentry *lower_dentry; 991237fead6SMichael Halcrow 992237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 993237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 994237fead6SMichael Halcrow rc = -ENOSYS; 995237fead6SMichael Halcrow goto out; 996237fead6SMichael Halcrow } 997237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 998237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, 999237fead6SMichael Halcrow size, flags); 1000237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1001237fead6SMichael Halcrow out: 1002237fead6SMichael Halcrow return rc; 1003237fead6SMichael Halcrow } 1004237fead6SMichael Halcrow 1005dd2a3b7aSMichael Halcrow ssize_t 1006237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1007237fead6SMichael Halcrow size_t size) 1008237fead6SMichael Halcrow { 1009237fead6SMichael Halcrow int rc = 0; 1010237fead6SMichael Halcrow struct dentry *lower_dentry; 1011237fead6SMichael Halcrow 1012237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1013237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1014237fead6SMichael Halcrow rc = -ENOSYS; 1015237fead6SMichael Halcrow goto out; 1016237fead6SMichael Halcrow } 1017237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1018237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1019237fead6SMichael Halcrow size); 1020237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1021237fead6SMichael Halcrow out: 1022237fead6SMichael Halcrow return rc; 1023237fead6SMichael Halcrow } 1024237fead6SMichael Halcrow 1025237fead6SMichael Halcrow static ssize_t 1026237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1027237fead6SMichael Halcrow { 1028237fead6SMichael Halcrow int rc = 0; 1029237fead6SMichael Halcrow struct dentry *lower_dentry; 1030237fead6SMichael Halcrow 1031237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1032237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1033237fead6SMichael Halcrow rc = -ENOSYS; 1034237fead6SMichael Halcrow goto out; 1035237fead6SMichael Halcrow } 1036237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1037237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1038237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1039237fead6SMichael Halcrow out: 1040237fead6SMichael Halcrow return rc; 1041237fead6SMichael Halcrow } 1042237fead6SMichael Halcrow 1043237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1044237fead6SMichael Halcrow { 1045237fead6SMichael Halcrow int rc = 0; 1046237fead6SMichael Halcrow struct dentry *lower_dentry; 1047237fead6SMichael Halcrow 1048237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1049237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1050237fead6SMichael Halcrow rc = -ENOSYS; 1051237fead6SMichael Halcrow goto out; 1052237fead6SMichael Halcrow } 1053237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1054237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1055237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1056237fead6SMichael Halcrow out: 1057237fead6SMichael Halcrow return rc; 1058237fead6SMichael Halcrow } 1059237fead6SMichael Halcrow 1060237fead6SMichael Halcrow int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) 1061237fead6SMichael Halcrow { 1062237fead6SMichael Halcrow if ((ecryptfs_inode_to_lower(inode) 1063237fead6SMichael Halcrow == (struct inode *)candidate_lower_inode)) 1064237fead6SMichael Halcrow return 1; 1065237fead6SMichael Halcrow else 1066237fead6SMichael Halcrow return 0; 1067237fead6SMichael Halcrow } 1068237fead6SMichael Halcrow 1069237fead6SMichael Halcrow int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 1070237fead6SMichael Halcrow { 1071237fead6SMichael Halcrow ecryptfs_init_inode(inode, (struct inode *)lower_inode); 1072237fead6SMichael Halcrow return 0; 1073237fead6SMichael Halcrow } 1074237fead6SMichael Halcrow 1075754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1076237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1077237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1078237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1079237fead6SMichael Halcrow .permission = ecryptfs_permission, 1080237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1081237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1082237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1083237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1084237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1085237fead6SMichael Halcrow }; 1086237fead6SMichael Halcrow 1087754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1088237fead6SMichael Halcrow .create = ecryptfs_create, 1089237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1090237fead6SMichael Halcrow .link = ecryptfs_link, 1091237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1092237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1093237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1094237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1095237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1096237fead6SMichael Halcrow .rename = ecryptfs_rename, 1097237fead6SMichael Halcrow .permission = ecryptfs_permission, 1098237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1099237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1100237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1101237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1102237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1103237fead6SMichael Halcrow }; 1104237fead6SMichael Halcrow 1105754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1106237fead6SMichael Halcrow .permission = ecryptfs_permission, 1107237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1108237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1109237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1110237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1111237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1112237fead6SMichael Halcrow }; 1113