1237fead6SMichael Halcrow /** 2237fead6SMichael Halcrow * eCryptfs: Linux filesystem encryption layer 3237fead6SMichael Halcrow * 4237fead6SMichael Halcrow * Copyright (C) 1997-2004 Erez Zadok 5237fead6SMichael Halcrow * Copyright (C) 2001-2004 Stony Brook University 6dd2a3b7aSMichael Halcrow * Copyright (C) 2004-2007 International Business Machines Corp. 7237fead6SMichael Halcrow * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> 8237fead6SMichael Halcrow * Michael C. Thompsion <mcthomps@us.ibm.com> 9237fead6SMichael Halcrow * 10237fead6SMichael Halcrow * This program is free software; you can redistribute it and/or 11237fead6SMichael Halcrow * modify it under the terms of the GNU General Public License as 12237fead6SMichael Halcrow * published by the Free Software Foundation; either version 2 of the 13237fead6SMichael Halcrow * License, or (at your option) any later version. 14237fead6SMichael Halcrow * 15237fead6SMichael Halcrow * This program is distributed in the hope that it will be useful, but 16237fead6SMichael Halcrow * WITHOUT ANY WARRANTY; without even the implied warranty of 17237fead6SMichael Halcrow * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18237fead6SMichael Halcrow * General Public License for more details. 19237fead6SMichael Halcrow * 20237fead6SMichael Halcrow * You should have received a copy of the GNU General Public License 21237fead6SMichael Halcrow * along with this program; if not, write to the Free Software 22237fead6SMichael Halcrow * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 23237fead6SMichael Halcrow * 02111-1307, USA. 24237fead6SMichael Halcrow */ 25237fead6SMichael Halcrow 26237fead6SMichael Halcrow #include <linux/file.h> 27237fead6SMichael Halcrow #include <linux/vmalloc.h> 28237fead6SMichael Halcrow #include <linux/pagemap.h> 29237fead6SMichael Halcrow #include <linux/dcache.h> 30237fead6SMichael Halcrow #include <linux/namei.h> 31237fead6SMichael Halcrow #include <linux/mount.h> 32237fead6SMichael Halcrow #include <linux/crypto.h> 330cc72dc7SJosef "Jeff" Sipek #include <linux/fs_stack.h> 340a688ad7SHarvey Harrison #include <asm/unaligned.h> 35237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 36237fead6SMichael Halcrow 37237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 38237fead6SMichael Halcrow { 39237fead6SMichael Halcrow struct dentry *dir; 40237fead6SMichael Halcrow 418dc4e373SMiklos Szeredi dir = dget_parent(dentry); 42908e0a8aSPeter Zijlstra mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); 43237fead6SMichael Halcrow return dir; 44237fead6SMichael Halcrow } 45237fead6SMichael Halcrow 46237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 47237fead6SMichael Halcrow { 48237fead6SMichael Halcrow mutex_unlock(&dir->d_inode->i_mutex); 49237fead6SMichael Halcrow dput(dir); 50237fead6SMichael Halcrow } 51237fead6SMichael Halcrow 52237fead6SMichael Halcrow /** 53237fead6SMichael Halcrow * ecryptfs_create_underlying_file 54237fead6SMichael Halcrow * @lower_dir_inode: inode of the parent in the lower fs of the new file 55237fead6SMichael Halcrow * @lower_dentry: New file's dentry in the lower fs 56237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 57237fead6SMichael Halcrow * @mode: The mode of the new file 58237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 59237fead6SMichael Halcrow * 60237fead6SMichael Halcrow * Creates the file in the lower file system. 61237fead6SMichael Halcrow * 62237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 63237fead6SMichael Halcrow */ 64237fead6SMichael Halcrow static int 65237fead6SMichael Halcrow ecryptfs_create_underlying_file(struct inode *lower_dir_inode, 66237fead6SMichael Halcrow struct dentry *dentry, int mode, 67237fead6SMichael Halcrow struct nameidata *nd) 68237fead6SMichael Halcrow { 69237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 70237fead6SMichael Halcrow struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); 71237fead6SMichael Halcrow struct dentry *dentry_save; 72237fead6SMichael Halcrow struct vfsmount *vfsmount_save; 73237fead6SMichael Halcrow int rc; 74237fead6SMichael Halcrow 754ac91378SJan Blunck dentry_save = nd->path.dentry; 764ac91378SJan Blunck vfsmount_save = nd->path.mnt; 774ac91378SJan Blunck nd->path.dentry = lower_dentry; 784ac91378SJan Blunck nd->path.mnt = lower_mnt; 79237fead6SMichael Halcrow rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); 804ac91378SJan Blunck nd->path.dentry = dentry_save; 814ac91378SJan Blunck nd->path.mnt = vfsmount_save; 82237fead6SMichael Halcrow return rc; 83237fead6SMichael Halcrow } 84237fead6SMichael Halcrow 85237fead6SMichael Halcrow /** 86237fead6SMichael Halcrow * ecryptfs_do_create 87237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 88237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 89237fead6SMichael Halcrow * @mode: The mode of the new file 90237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 91237fead6SMichael Halcrow * 92237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 93237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 94237fead6SMichael Halcrow * stat of the lower directory inode. 95237fead6SMichael Halcrow * 96237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 97237fead6SMichael Halcrow */ 98237fead6SMichael Halcrow static int 99237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 100237fead6SMichael Halcrow struct dentry *ecryptfs_dentry, int mode, 101237fead6SMichael Halcrow struct nameidata *nd) 102237fead6SMichael Halcrow { 103237fead6SMichael Halcrow int rc; 104237fead6SMichael Halcrow struct dentry *lower_dentry; 105237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 106237fead6SMichael Halcrow 107237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 108237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 109801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 110237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 111237fead6SMichael Halcrow "dentry\n"); 112237fead6SMichael Halcrow rc = PTR_ERR(lower_dir_dentry); 113237fead6SMichael Halcrow goto out; 114237fead6SMichael Halcrow } 115237fead6SMichael Halcrow rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, 116237fead6SMichael Halcrow ecryptfs_dentry, mode, nd); 1174981e081SMichael Halcrow if (rc) { 118caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 11918d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 120237fead6SMichael Halcrow goto out_lock; 121237fead6SMichael Halcrow } 122237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 123237fead6SMichael Halcrow directory_inode->i_sb, 0); 124237fead6SMichael Halcrow if (rc) { 125237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); 126237fead6SMichael Halcrow goto out_lock; 127237fead6SMichael Halcrow } 1280cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 1290cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 130237fead6SMichael Halcrow out_lock: 131237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 132237fead6SMichael Halcrow out: 133237fead6SMichael Halcrow return rc; 134237fead6SMichael Halcrow } 135237fead6SMichael Halcrow 136237fead6SMichael Halcrow /** 137237fead6SMichael Halcrow * grow_file 138d7cdc5feSMichael Halcrow * @ecryptfs_dentry: the eCryptfs dentry 139237fead6SMichael Halcrow * 140237fead6SMichael Halcrow * This is the code which will grow the file to its correct size. 141237fead6SMichael Halcrow */ 142d7cdc5feSMichael Halcrow static int grow_file(struct dentry *ecryptfs_dentry) 143237fead6SMichael Halcrow { 144d7cdc5feSMichael Halcrow struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; 145237fead6SMichael Halcrow struct file fake_file; 146237fead6SMichael Halcrow struct ecryptfs_file_info tmp_file_info; 147d7cdc5feSMichael Halcrow char zero_virt[] = { 0x00 }; 148d7cdc5feSMichael Halcrow int rc = 0; 149237fead6SMichael Halcrow 150237fead6SMichael Halcrow memset(&fake_file, 0, sizeof(fake_file)); 151bd243a4bSJosef "Jeff" Sipek fake_file.f_path.dentry = ecryptfs_dentry; 152237fead6SMichael Halcrow memset(&tmp_file_info, 0, sizeof(tmp_file_info)); 153237fead6SMichael Halcrow ecryptfs_set_file_private(&fake_file, &tmp_file_info); 154d7cdc5feSMichael Halcrow ecryptfs_set_file_lower( 155d7cdc5feSMichael Halcrow &fake_file, 156d7cdc5feSMichael Halcrow ecryptfs_inode_to_private(ecryptfs_inode)->lower_file); 157d7cdc5feSMichael Halcrow rc = ecryptfs_write(&fake_file, zero_virt, 0, 1); 158d7cdc5feSMichael Halcrow i_size_write(ecryptfs_inode, 0); 159d7cdc5feSMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); 160d7cdc5feSMichael Halcrow ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= 161d7cdc5feSMichael Halcrow ECRYPTFS_NEW_FILE; 162237fead6SMichael Halcrow return rc; 163237fead6SMichael Halcrow } 164237fead6SMichael Halcrow 165237fead6SMichael Halcrow /** 166237fead6SMichael Halcrow * ecryptfs_initialize_file 167237fead6SMichael Halcrow * 168237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 169237fead6SMichael Halcrow * file with a header and first data page. 170237fead6SMichael Halcrow * 171237fead6SMichael Halcrow * Returns zero on success 172237fead6SMichael Halcrow */ 173237fead6SMichael Halcrow static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) 174237fead6SMichael Halcrow { 175d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 176d7cdc5feSMichael Halcrow &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; 177237fead6SMichael Halcrow int rc = 0; 178237fead6SMichael Halcrow 179237fead6SMichael Halcrow if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { 180237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 181e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 182d7cdc5feSMichael Halcrow goto out; 183237fead6SMichael Halcrow } 184e2bd99ecSMichael Halcrow crypt_stat->flags |= ECRYPTFS_NEW_FILE; 185237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 186237fead6SMichael Halcrow rc = ecryptfs_new_file_context(ecryptfs_dentry); 187237fead6SMichael Halcrow if (rc) { 188d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 189d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 190d7cdc5feSMichael Halcrow goto out; 191237fead6SMichael Halcrow } 192391b52f9SMichael Halcrow if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { 193391b52f9SMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 194391b52f9SMichael Halcrow if (rc) { 195391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 196391b52f9SMichael Halcrow "the persistent file for the dentry with name " 197391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 198391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 199391b52f9SMichael Halcrow goto out; 200391b52f9SMichael Halcrow } 201391b52f9SMichael Halcrow } 202d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 203237fead6SMichael Halcrow if (rc) { 204d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 205d7cdc5feSMichael Halcrow goto out; 206237fead6SMichael Halcrow } 207d7cdc5feSMichael Halcrow rc = grow_file(ecryptfs_dentry); 2085dda6992SMichael Halcrow if (rc) 209d7cdc5feSMichael Halcrow printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); 210237fead6SMichael Halcrow out: 211237fead6SMichael Halcrow return rc; 212237fead6SMichael Halcrow } 213237fead6SMichael Halcrow 214237fead6SMichael Halcrow /** 215237fead6SMichael Halcrow * ecryptfs_create 216237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 217237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 218237fead6SMichael Halcrow * @mode: The mode of the new file. 219237fead6SMichael Halcrow * @nd: nameidata 220237fead6SMichael Halcrow * 221237fead6SMichael Halcrow * Creates a new file. 222237fead6SMichael Halcrow * 223237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 224237fead6SMichael Halcrow */ 225237fead6SMichael Halcrow static int 226237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 227237fead6SMichael Halcrow int mode, struct nameidata *nd) 228237fead6SMichael Halcrow { 229237fead6SMichael Halcrow int rc; 230237fead6SMichael Halcrow 231addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 232237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 233237fead6SMichael Halcrow if (unlikely(rc)) { 234237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 235237fead6SMichael Halcrow "lower filesystem\n"); 236237fead6SMichael Halcrow goto out; 237237fead6SMichael Halcrow } 238237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 239237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 240237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 241237fead6SMichael Halcrow out: 242237fead6SMichael Halcrow return rc; 243237fead6SMichael Halcrow } 244237fead6SMichael Halcrow 245237fead6SMichael Halcrow /** 246addd65adSMichael Halcrow * ecryptfs_lookup_and_interpose_lower - Perform a lookup 247237fead6SMichael Halcrow */ 248addd65adSMichael Halcrow int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, 249addd65adSMichael Halcrow struct dentry *lower_dentry, 250addd65adSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat, 251addd65adSMichael Halcrow struct inode *ecryptfs_dir_inode, 252addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 253237fead6SMichael Halcrow { 254237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 255237fead6SMichael Halcrow struct vfsmount *lower_mnt; 256addd65adSMichael Halcrow struct inode *lower_inode; 257e77a56ddSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 258237fead6SMichael Halcrow char *page_virt = NULL; 259237fead6SMichael Halcrow u64 file_size; 260addd65adSMichael Halcrow int rc = 0; 261237fead6SMichael Halcrow 262addd65adSMichael Halcrow lower_dir_dentry = lower_dentry->d_parent; 263addd65adSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 264addd65adSMichael Halcrow ecryptfs_dentry->d_parent)); 265237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 266addd65adSMichael Halcrow fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); 267237fead6SMichael Halcrow BUG_ON(!atomic_read(&lower_dentry->d_count)); 268addd65adSMichael Halcrow ecryptfs_set_dentry_private(ecryptfs_dentry, 269237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 270e94b1766SChristoph Lameter GFP_KERNEL)); 271addd65adSMichael Halcrow if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { 272237fead6SMichael Halcrow rc = -ENOMEM; 273addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting " 274addd65adSMichael Halcrow "to allocate ecryptfs_dentry_info struct\n", 275addd65adSMichael Halcrow __func__); 276237fead6SMichael Halcrow goto out_dput; 277237fead6SMichael Halcrow } 278addd65adSMichael Halcrow ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); 279addd65adSMichael Halcrow ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); 280237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 281237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 282addd65adSMichael Halcrow d_add(ecryptfs_dentry, NULL); 283237fead6SMichael Halcrow goto out; 284237fead6SMichael Halcrow } 285addd65adSMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 286addd65adSMichael Halcrow ecryptfs_dir_inode->i_sb, 1); 287237fead6SMichael Halcrow if (rc) { 288addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 289addd65adSMichael Halcrow __func__, rc); 290391b52f9SMichael Halcrow goto out; 291237fead6SMichael Halcrow } 292addd65adSMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) 293237fead6SMichael Halcrow goto out; 294addd65adSMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) 295237fead6SMichael Halcrow goto out; 296addd65adSMichael Halcrow if (special_file(lower_inode->i_mode)) 297202a21d6SRyusuke Konishi goto out; 298addd65adSMichael Halcrow if (!ecryptfs_nd) 299237fead6SMichael Halcrow goto out; 300237fead6SMichael Halcrow /* Released in this function */ 301addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 302237fead6SMichael Halcrow if (!page_virt) { 303addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 304addd65adSMichael Halcrow __func__); 305237fead6SMichael Halcrow rc = -ENOMEM; 306391b52f9SMichael Halcrow goto out; 307237fead6SMichael Halcrow } 308addd65adSMichael Halcrow if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { 309addd65adSMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 310391b52f9SMichael Halcrow if (rc) { 311391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 312391b52f9SMichael Halcrow "the persistent file for the dentry with name " 313391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 314addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 315addd65adSMichael Halcrow goto out_free_kmem; 316391b52f9SMichael Halcrow } 317391b52f9SMichael Halcrow } 318d7cdc5feSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, 319addd65adSMichael Halcrow ecryptfs_dentry->d_inode); 320237fead6SMichael Halcrow if (rc) { 321addd65adSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, 322addd65adSMichael Halcrow ecryptfs_dentry); 323dd2a3b7aSMichael Halcrow if (rc) { 324237fead6SMichael Halcrow rc = 0; 325addd65adSMichael Halcrow goto out_free_kmem; 326237fead6SMichael Halcrow } 327dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 328dd2a3b7aSMichael Halcrow } 329e77a56ddSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 330addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 331e77a56ddSMichael Halcrow if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { 332e77a56ddSMichael Halcrow if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 333cc11beffSMichael Halcrow file_size = (crypt_stat->num_header_bytes_at_front 334e77a56ddSMichael Halcrow + i_size_read(lower_dentry->d_inode)); 335e77a56ddSMichael Halcrow else 336e77a56ddSMichael Halcrow file_size = i_size_read(lower_dentry->d_inode); 337e77a56ddSMichael Halcrow } else { 3380a688ad7SHarvey Harrison file_size = get_unaligned_be64(page_virt); 339e77a56ddSMichael Halcrow } 340addd65adSMichael Halcrow i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); 341addd65adSMichael Halcrow out_free_kmem: 342237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 343237fead6SMichael Halcrow goto out; 344237fead6SMichael Halcrow out_dput: 345237fead6SMichael Halcrow dput(lower_dentry); 346addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 347237fead6SMichael Halcrow out: 348addd65adSMichael Halcrow return rc; 349addd65adSMichael Halcrow } 350addd65adSMichael Halcrow 351addd65adSMichael Halcrow /** 352addd65adSMichael Halcrow * ecryptfs_lookup 353addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 354addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 355addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 356addd65adSMichael Halcrow * 357addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 358addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 359addd65adSMichael Halcrow */ 360addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 361addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 362addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 363addd65adSMichael Halcrow { 364addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 365addd65adSMichael Halcrow int encrypted_and_encoded_name_size; 366addd65adSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = NULL; 367addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 368addd65adSMichael Halcrow struct ecryptfs_inode_info *inode_info; 369addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 370addd65adSMichael Halcrow int rc = 0; 371addd65adSMichael Halcrow 372addd65adSMichael Halcrow ecryptfs_dentry->d_op = &ecryptfs_dops; 373addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 374addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 375addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 376addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 377addd65adSMichael Halcrow goto out_d_drop; 378addd65adSMichael Halcrow } 379addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 380addd65adSMichael Halcrow lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 381addd65adSMichael Halcrow lower_dir_dentry, 382addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 383addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 384addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 385addd65adSMichael Halcrow printk(KERN_ERR "%s: lookup_one_len() returned [%d] on " 386addd65adSMichael Halcrow "lower_dentry = [%s]\n", __func__, rc, 387addd65adSMichael Halcrow ecryptfs_dentry->d_name.name); 388addd65adSMichael Halcrow goto out_d_drop; 389addd65adSMichael Halcrow } 390addd65adSMichael Halcrow if (lower_dentry->d_inode) 391addd65adSMichael Halcrow goto lookup_and_interpose; 392addd65adSMichael Halcrow inode_info = ecryptfs_inode_to_private(ecryptfs_dentry->d_inode); 393addd65adSMichael Halcrow if (inode_info) { 394addd65adSMichael Halcrow crypt_stat = &inode_info->crypt_stat; 395addd65adSMichael Halcrow /* TODO: lock for crypt_stat comparison */ 396addd65adSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 397addd65adSMichael Halcrow ecryptfs_set_default_sizes(crypt_stat); 398addd65adSMichael Halcrow } 399addd65adSMichael Halcrow if (crypt_stat) 400addd65adSMichael Halcrow mount_crypt_stat = crypt_stat->mount_crypt_stat; 401addd65adSMichael Halcrow else 402addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 403addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 404addd65adSMichael Halcrow if (!(crypt_stat && (crypt_stat->flags & ECRYPTFS_ENCRYPT_FILENAMES)) 405addd65adSMichael Halcrow && !(mount_crypt_stat && (mount_crypt_stat->flags 406addd65adSMichael Halcrow & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 407addd65adSMichael Halcrow goto lookup_and_interpose; 408addd65adSMichael Halcrow dput(lower_dentry); 409addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 410addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 411addd65adSMichael Halcrow crypt_stat, mount_crypt_stat, ecryptfs_dentry->d_name.name, 412addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 413addd65adSMichael Halcrow if (rc) { 414addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 415addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 416addd65adSMichael Halcrow goto out_d_drop; 417addd65adSMichael Halcrow } 418addd65adSMichael Halcrow lower_dentry = lookup_one_len(encrypted_and_encoded_name, 419addd65adSMichael Halcrow lower_dir_dentry, 420addd65adSMichael Halcrow encrypted_and_encoded_name_size - 1); 421addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 422addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 423addd65adSMichael Halcrow printk(KERN_ERR "%s: lookup_one_len() returned [%d] on " 424addd65adSMichael Halcrow "lower_dentry = [%s]\n", __func__, rc, 425addd65adSMichael Halcrow encrypted_and_encoded_name); 426addd65adSMichael Halcrow goto out_d_drop; 427addd65adSMichael Halcrow } 428addd65adSMichael Halcrow lookup_and_interpose: 429addd65adSMichael Halcrow rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, 430addd65adSMichael Halcrow crypt_stat, ecryptfs_dir_inode, 431addd65adSMichael Halcrow ecryptfs_nd); 432addd65adSMichael Halcrow goto out; 433addd65adSMichael Halcrow out_d_drop: 434addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 435addd65adSMichael Halcrow out: 436addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 437237fead6SMichael Halcrow return ERR_PTR(rc); 438237fead6SMichael Halcrow } 439237fead6SMichael Halcrow 440237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 441237fead6SMichael Halcrow struct dentry *new_dentry) 442237fead6SMichael Halcrow { 443237fead6SMichael Halcrow struct dentry *lower_old_dentry; 444237fead6SMichael Halcrow struct dentry *lower_new_dentry; 445237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 446237fead6SMichael Halcrow u64 file_size_save; 447237fead6SMichael Halcrow int rc; 448237fead6SMichael Halcrow 449237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 450237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 451237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 452237fead6SMichael Halcrow dget(lower_old_dentry); 453237fead6SMichael Halcrow dget(lower_new_dentry); 454237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 455237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 456237fead6SMichael Halcrow lower_new_dentry); 457237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 458237fead6SMichael Halcrow goto out_lock; 459237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 460237fead6SMichael Halcrow if (rc) 461237fead6SMichael Halcrow goto out_lock; 4620cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); 4630cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); 464237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 465237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 466237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 467237fead6SMichael Halcrow out_lock: 468237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 469237fead6SMichael Halcrow dput(lower_new_dentry); 470237fead6SMichael Halcrow dput(lower_old_dentry); 471ae56fb16SMichael Halcrow d_drop(lower_old_dentry); 472237fead6SMichael Halcrow d_drop(new_dentry); 47345ec4abaSMichael Halcrow d_drop(old_dentry); 474237fead6SMichael Halcrow return rc; 475237fead6SMichael Halcrow } 476237fead6SMichael Halcrow 477237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 478237fead6SMichael Halcrow { 479237fead6SMichael Halcrow int rc = 0; 480237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 481237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 4828dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 483237fead6SMichael Halcrow 4848dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 485237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 486237fead6SMichael Halcrow if (rc) { 487ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 488237fead6SMichael Halcrow goto out_unlock; 489237fead6SMichael Halcrow } 4900cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 491237fead6SMichael Halcrow dentry->d_inode->i_nlink = 492237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 493237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 494caeeeecfSMichael Halcrow d_drop(dentry); 495237fead6SMichael Halcrow out_unlock: 4968dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 497237fead6SMichael Halcrow return rc; 498237fead6SMichael Halcrow } 499237fead6SMichael Halcrow 500237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 501237fead6SMichael Halcrow const char *symname) 502237fead6SMichael Halcrow { 503237fead6SMichael Halcrow int rc; 504237fead6SMichael Halcrow struct dentry *lower_dentry; 505237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 506237fead6SMichael Halcrow char *encoded_symname; 507addd65adSMichael Halcrow size_t encoded_symlen; 508addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 509237fead6SMichael Halcrow 510237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 511237fead6SMichael Halcrow dget(lower_dentry); 512237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 513addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 514addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 515addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 516addd65adSMichael Halcrow &encoded_symlen, 517addd65adSMichael Halcrow NULL, 518addd65adSMichael Halcrow mount_crypt_stat, symname, 519addd65adSMichael Halcrow strlen(symname)); 520addd65adSMichael Halcrow if (rc) 521237fead6SMichael Halcrow goto out_lock; 522237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 523db2e747bSMiklos Szeredi encoded_symname); 524237fead6SMichael Halcrow kfree(encoded_symname); 525237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 526237fead6SMichael Halcrow goto out_lock; 527237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 528237fead6SMichael Halcrow if (rc) 529237fead6SMichael Halcrow goto out_lock; 5300cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5310cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 532237fead6SMichael Halcrow out_lock: 533237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 534237fead6SMichael Halcrow dput(lower_dentry); 535237fead6SMichael Halcrow if (!dentry->d_inode) 536237fead6SMichael Halcrow d_drop(dentry); 537237fead6SMichael Halcrow return rc; 538237fead6SMichael Halcrow } 539237fead6SMichael Halcrow 540237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 541237fead6SMichael Halcrow { 542237fead6SMichael Halcrow int rc; 543237fead6SMichael Halcrow struct dentry *lower_dentry; 544237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 545237fead6SMichael Halcrow 546237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 547237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 548237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 549237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 550237fead6SMichael Halcrow goto out; 551237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 552237fead6SMichael Halcrow if (rc) 553237fead6SMichael Halcrow goto out; 5540cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5550cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 556237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 557237fead6SMichael Halcrow out: 558237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 559237fead6SMichael Halcrow if (!dentry->d_inode) 560237fead6SMichael Halcrow d_drop(dentry); 561237fead6SMichael Halcrow return rc; 562237fead6SMichael Halcrow } 563237fead6SMichael Halcrow 564237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 565237fead6SMichael Halcrow { 566237fead6SMichael Halcrow struct dentry *lower_dentry; 567237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 56845ec4abaSMichael Halcrow int rc; 569237fead6SMichael Halcrow 570237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 57145ec4abaSMichael Halcrow dget(dentry); 572237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 57345ec4abaSMichael Halcrow dget(lower_dentry); 574237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 57545ec4abaSMichael Halcrow dput(lower_dentry); 57645ec4abaSMichael Halcrow if (!rc) 57745ec4abaSMichael Halcrow d_delete(lower_dentry); 5780cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 579237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 580237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 581237fead6SMichael Halcrow if (!rc) 582237fead6SMichael Halcrow d_drop(dentry); 58345ec4abaSMichael Halcrow dput(dentry); 584237fead6SMichael Halcrow return rc; 585237fead6SMichael Halcrow } 586237fead6SMichael Halcrow 587237fead6SMichael Halcrow static int 588237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 589237fead6SMichael Halcrow { 590237fead6SMichael Halcrow int rc; 591237fead6SMichael Halcrow struct dentry *lower_dentry; 592237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 593237fead6SMichael Halcrow 594237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 595237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 596237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 597237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 598237fead6SMichael Halcrow goto out; 599391b52f9SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 600237fead6SMichael Halcrow if (rc) 601237fead6SMichael Halcrow goto out; 6020cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6030cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 604237fead6SMichael Halcrow out: 605237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 606237fead6SMichael Halcrow if (!dentry->d_inode) 607237fead6SMichael Halcrow d_drop(dentry); 608237fead6SMichael Halcrow return rc; 609237fead6SMichael Halcrow } 610237fead6SMichael Halcrow 611237fead6SMichael Halcrow static int 612237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 613237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 614237fead6SMichael Halcrow { 615237fead6SMichael Halcrow int rc; 616237fead6SMichael Halcrow struct dentry *lower_old_dentry; 617237fead6SMichael Halcrow struct dentry *lower_new_dentry; 618237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 619237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 620237fead6SMichael Halcrow 621237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 622237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 623237fead6SMichael Halcrow dget(lower_old_dentry); 624237fead6SMichael Halcrow dget(lower_new_dentry); 625237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 626237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 627237fead6SMichael Halcrow lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 628237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 629237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 630237fead6SMichael Halcrow if (rc) 631237fead6SMichael Halcrow goto out_lock; 6320cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL); 633237fead6SMichael Halcrow if (new_dir != old_dir) 6340cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL); 635237fead6SMichael Halcrow out_lock: 636237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 637a9083081SMichael Halcrow dput(lower_new_dentry->d_parent); 638a9083081SMichael Halcrow dput(lower_old_dentry->d_parent); 639237fead6SMichael Halcrow dput(lower_new_dentry); 640237fead6SMichael Halcrow dput(lower_old_dentry); 641237fead6SMichael Halcrow return rc; 642237fead6SMichael Halcrow } 643237fead6SMichael Halcrow 644237fead6SMichael Halcrow static int 645237fead6SMichael Halcrow ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 646237fead6SMichael Halcrow { 647237fead6SMichael Halcrow char *lower_buf; 648addd65adSMichael Halcrow struct dentry *lower_dentry; 649237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 650addd65adSMichael Halcrow char *plaintext_name; 651addd65adSMichael Halcrow size_t plaintext_name_size; 652addd65adSMichael Halcrow mm_segment_t old_fs; 653addd65adSMichael Halcrow int rc; 654237fead6SMichael Halcrow 655237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 656acfa4380SAl Viro if (!lower_dentry->d_inode->i_op->readlink) { 657237fead6SMichael Halcrow rc = -EINVAL; 658237fead6SMichael Halcrow goto out; 659237fead6SMichael Halcrow } 660addd65adSMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 661237fead6SMichael Halcrow /* Released in this function */ 662237fead6SMichael Halcrow lower_buf = kmalloc(bufsiz, GFP_KERNEL); 663237fead6SMichael Halcrow if (lower_buf == NULL) { 664addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting to " 665addd65adSMichael Halcrow "kmalloc [%d] bytes\n", __func__, bufsiz); 666237fead6SMichael Halcrow rc = -ENOMEM; 667237fead6SMichael Halcrow goto out; 668237fead6SMichael Halcrow } 669237fead6SMichael Halcrow old_fs = get_fs(); 670237fead6SMichael Halcrow set_fs(get_ds()); 671237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 672237fead6SMichael Halcrow (char __user *)lower_buf, 673237fead6SMichael Halcrow bufsiz); 674237fead6SMichael Halcrow set_fs(old_fs); 675237fead6SMichael Halcrow if (rc >= 0) { 676addd65adSMichael Halcrow rc = ecryptfs_decode_and_decrypt_filename(&plaintext_name, 677addd65adSMichael Halcrow &plaintext_name_size, 678addd65adSMichael Halcrow dentry, lower_buf, 679addd65adSMichael Halcrow rc); 680addd65adSMichael Halcrow if (rc) { 681addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to decode and " 682addd65adSMichael Halcrow "decrypt filename; rc = [%d]\n", __func__, 683addd65adSMichael Halcrow rc); 684237fead6SMichael Halcrow goto out_free_lower_buf; 685237fead6SMichael Halcrow } 686addd65adSMichael Halcrow rc = copy_to_user(buf, plaintext_name, plaintext_name_size); 687addd65adSMichael Halcrow if (rc) 688addd65adSMichael Halcrow rc = -EFAULT; 689addd65adSMichael Halcrow else 690addd65adSMichael Halcrow rc = plaintext_name_size; 691addd65adSMichael Halcrow kfree(plaintext_name); 692addd65adSMichael Halcrow fsstack_copy_attr_atime(dentry->d_inode, lower_dentry->d_inode); 693237fead6SMichael Halcrow } 694237fead6SMichael Halcrow out_free_lower_buf: 695237fead6SMichael Halcrow kfree(lower_buf); 696237fead6SMichael Halcrow out: 697237fead6SMichael Halcrow return rc; 698237fead6SMichael Halcrow } 699237fead6SMichael Halcrow 700237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 701237fead6SMichael Halcrow { 702237fead6SMichael Halcrow char *buf; 703237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 704237fead6SMichael Halcrow mm_segment_t old_fs; 705237fead6SMichael Halcrow 706237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 707237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 708237fead6SMichael Halcrow if (!buf) { 709237fead6SMichael Halcrow rc = -ENOMEM; 710237fead6SMichael Halcrow goto out; 711237fead6SMichael Halcrow } 712237fead6SMichael Halcrow old_fs = get_fs(); 713237fead6SMichael Halcrow set_fs(get_ds()); 714237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 715237fead6SMichael Halcrow set_fs(old_fs); 716237fead6SMichael Halcrow if (rc < 0) 717237fead6SMichael Halcrow goto out_free; 718a17d5232SDuane Griffin else 719a17d5232SDuane Griffin buf[rc] = '\0'; 720237fead6SMichael Halcrow rc = 0; 721237fead6SMichael Halcrow nd_set_link(nd, buf); 722237fead6SMichael Halcrow goto out; 723237fead6SMichael Halcrow out_free: 724237fead6SMichael Halcrow kfree(buf); 725237fead6SMichael Halcrow out: 726237fead6SMichael Halcrow return ERR_PTR(rc); 727237fead6SMichael Halcrow } 728237fead6SMichael Halcrow 729237fead6SMichael Halcrow static void 730237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 731237fead6SMichael Halcrow { 732237fead6SMichael Halcrow /* Free the char* */ 733237fead6SMichael Halcrow kfree(nd_get_link(nd)); 734237fead6SMichael Halcrow } 735237fead6SMichael Halcrow 736237fead6SMichael Halcrow /** 737237fead6SMichael Halcrow * upper_size_to_lower_size 738237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 739237fead6SMichael Halcrow * @upper_size: Size of the upper file 740237fead6SMichael Halcrow * 741cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 742237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 743237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 744237fead6SMichael Halcrow * 745237fead6SMichael Halcrow * Returns Calculated size of the lower file. 746237fead6SMichael Halcrow */ 747237fead6SMichael Halcrow static loff_t 748237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 749237fead6SMichael Halcrow loff_t upper_size) 750237fead6SMichael Halcrow { 751237fead6SMichael Halcrow loff_t lower_size; 752237fead6SMichael Halcrow 753cc11beffSMichael Halcrow lower_size = crypt_stat->num_header_bytes_at_front; 754237fead6SMichael Halcrow if (upper_size != 0) { 755237fead6SMichael Halcrow loff_t num_extents; 756237fead6SMichael Halcrow 757237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 758237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 759237fead6SMichael Halcrow num_extents++; 760237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 761237fead6SMichael Halcrow } 762237fead6SMichael Halcrow return lower_size; 763237fead6SMichael Halcrow } 764237fead6SMichael Halcrow 765237fead6SMichael Halcrow /** 766237fead6SMichael Halcrow * ecryptfs_truncate 767237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 768237fead6SMichael Halcrow * @new_length: The length to expand the file to 769237fead6SMichael Halcrow * 770237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 771237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 772237fead6SMichael Halcrow * writing strings of 0's out. When truncating, we need to modify the 773237fead6SMichael Halcrow * underlying file size according to the page index interpolations. 774237fead6SMichael Halcrow * 775237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 776237fead6SMichael Halcrow */ 777237fead6SMichael Halcrow int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 778237fead6SMichael Halcrow { 779237fead6SMichael Halcrow int rc = 0; 780237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 781237fead6SMichael Halcrow struct dentry *lower_dentry; 7822ed92554SMichael Halcrow struct file fake_ecryptfs_file; 783237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 784237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 785237fead6SMichael Halcrow loff_t lower_size_before_truncate; 786237fead6SMichael Halcrow loff_t lower_size_after_truncate; 787237fead6SMichael Halcrow 788237fead6SMichael Halcrow if (unlikely((new_length == i_size))) 789237fead6SMichael Halcrow goto out; 790237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 791237fead6SMichael Halcrow /* Set up a fake ecryptfs file, this is used to interface with 792237fead6SMichael Halcrow * the file in the underlying filesystem so that the 793237fead6SMichael Halcrow * truncation has an effect there as well. */ 794237fead6SMichael Halcrow memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); 795bd243a4bSJosef "Jeff" Sipek fake_ecryptfs_file.f_path.dentry = dentry; 796237fead6SMichael Halcrow /* Released at out_free: label */ 797237fead6SMichael Halcrow ecryptfs_set_file_private(&fake_ecryptfs_file, 798237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_file_info_cache, 799e94b1766SChristoph Lameter GFP_KERNEL)); 800237fead6SMichael Halcrow if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { 801237fead6SMichael Halcrow rc = -ENOMEM; 802237fead6SMichael Halcrow goto out; 803237fead6SMichael Halcrow } 804237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 8052ed92554SMichael Halcrow ecryptfs_set_file_lower( 8062ed92554SMichael Halcrow &fake_ecryptfs_file, 8072ed92554SMichael Halcrow ecryptfs_inode_to_private(dentry->d_inode)->lower_file); 808237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 809237fead6SMichael Halcrow if (new_length > i_size) { 8102ed92554SMichael Halcrow char zero[] = { 0x00 }; 811240e2df5SMichael Halcrow 8122ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 8132ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 8142ed92554SMichael Halcrow * the intermediate portion of the previous end of the 8152ed92554SMichael Halcrow * file and the new and of the file */ 8162ed92554SMichael Halcrow rc = ecryptfs_write(&fake_ecryptfs_file, zero, 8172ed92554SMichael Halcrow (new_length - 1), 1); 8182ed92554SMichael Halcrow } else { /* new_length < i_size_read(inode) */ 8192ed92554SMichael Halcrow /* We're chopping off all the pages down do the page 8202ed92554SMichael Halcrow * in which new_length is located. Fill in the end of 8212ed92554SMichael Halcrow * that page from (new_length & ~PAGE_CACHE_MASK) to 8222ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8232ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8242ed92554SMichael Halcrow - (new_length & ~PAGE_CACHE_MASK)); 8252ed92554SMichael Halcrow 8262ed92554SMichael Halcrow if (num_zeros) { 8272ed92554SMichael Halcrow char *zeros_virt; 8282ed92554SMichael Halcrow 8292ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8302ed92554SMichael Halcrow if (!zeros_virt) { 8312ed92554SMichael Halcrow rc = -ENOMEM; 8322ed92554SMichael Halcrow goto out_free; 833240e2df5SMichael Halcrow } 8342ed92554SMichael Halcrow rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt, 8352ed92554SMichael Halcrow new_length, num_zeros); 8362ed92554SMichael Halcrow kfree(zeros_virt); 8375dda6992SMichael Halcrow if (rc) { 838240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 839240e2df5SMichael Halcrow "the remainder of the end page on " 840240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 8412ed92554SMichael Halcrow goto out_free; 842240e2df5SMichael Halcrow } 843240e2df5SMichael Halcrow } 844237fead6SMichael Halcrow vmtruncate(inode, new_length); 8450216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 846dd2a3b7aSMichael Halcrow if (rc) { 847dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 848dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 849dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 8502ed92554SMichael Halcrow goto out_free; 851dd2a3b7aSMichael Halcrow } 852237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 853237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 854237fead6SMichael Halcrow lower_size_before_truncate = 855237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 856237fead6SMichael Halcrow lower_size_after_truncate = 857237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, new_length); 858237fead6SMichael Halcrow if (lower_size_after_truncate < lower_size_before_truncate) 859237fead6SMichael Halcrow vmtruncate(lower_dentry->d_inode, 860237fead6SMichael Halcrow lower_size_after_truncate); 861237fead6SMichael Halcrow } 862237fead6SMichael Halcrow out_free: 863237fead6SMichael Halcrow if (ecryptfs_file_to_private(&fake_ecryptfs_file)) 864237fead6SMichael Halcrow kmem_cache_free(ecryptfs_file_info_cache, 865237fead6SMichael Halcrow ecryptfs_file_to_private(&fake_ecryptfs_file)); 866237fead6SMichael Halcrow out: 867237fead6SMichael Halcrow return rc; 868237fead6SMichael Halcrow } 869237fead6SMichael Halcrow 870237fead6SMichael Halcrow static int 871e6305c43SAl Viro ecryptfs_permission(struct inode *inode, int mask) 872237fead6SMichael Halcrow { 873f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 874237fead6SMichael Halcrow } 875237fead6SMichael Halcrow 876237fead6SMichael Halcrow /** 877237fead6SMichael Halcrow * ecryptfs_setattr 878237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 879237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 880237fead6SMichael Halcrow * 881237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 882237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 883237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 884237fead6SMichael Halcrow * 885237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 886237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 887237fead6SMichael Halcrow */ 888237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 889237fead6SMichael Halcrow { 890237fead6SMichael Halcrow int rc = 0; 891237fead6SMichael Halcrow struct dentry *lower_dentry; 892237fead6SMichael Halcrow struct inode *inode; 893237fead6SMichael Halcrow struct inode *lower_inode; 894237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 895237fead6SMichael Halcrow 896237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 897e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 898e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 899237fead6SMichael Halcrow inode = dentry->d_inode; 900237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 901e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 902e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 903e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 904e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 90564ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 90664ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 90764ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 908e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 909e10f281bSMichael Halcrow 910e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 911e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 912d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 9135dda6992SMichael Halcrow if (rc) { 914e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 915e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 916e10f281bSMichael Halcrow rc = -EIO; 91725bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 918e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 91925bd8174SMichael Halcrow "or the key could not be retrieved. " 92025bd8174SMichael Halcrow "Plaintext passthrough mode is not " 921e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 922e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 923e10f281bSMichael Halcrow goto out; 924e10f281bSMichael Halcrow } 925e10f281bSMichael Halcrow rc = 0; 926e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 927e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 928e10f281bSMichael Halcrow goto out; 929e10f281bSMichael Halcrow } 930e10f281bSMichael Halcrow } 931e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 932237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 933237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, 934237fead6SMichael Halcrow "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", 935237fead6SMichael Halcrow ia->ia_valid, ATTR_SIZE); 936237fead6SMichael Halcrow rc = ecryptfs_truncate(dentry, ia->ia_size); 937237fead6SMichael Halcrow /* ecryptfs_truncate handles resizing of the lower file */ 938237fead6SMichael Halcrow ia->ia_valid &= ~ATTR_SIZE; 939237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n", 940237fead6SMichael Halcrow ia->ia_valid); 941237fead6SMichael Halcrow if (rc < 0) 942237fead6SMichael Halcrow goto out; 943237fead6SMichael Halcrow } 9441ac564ecSJeff Layton 9451ac564ecSJeff Layton /* 9461ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9471ac564ecSJeff Layton * to interpret this in its own way. 9481ac564ecSJeff Layton */ 9491ac564ecSJeff Layton if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9501ac564ecSJeff Layton ia->ia_valid &= ~ATTR_MODE; 9511ac564ecSJeff Layton 9529c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 953237fead6SMichael Halcrow rc = notify_change(lower_dentry, ia); 9549c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 955237fead6SMichael Halcrow out: 9560cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_all(inode, lower_inode, NULL); 957237fead6SMichael Halcrow return rc; 958237fead6SMichael Halcrow } 959237fead6SMichael Halcrow 960dd2a3b7aSMichael Halcrow int 961237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 962237fead6SMichael Halcrow size_t size, int flags) 963237fead6SMichael Halcrow { 964237fead6SMichael Halcrow int rc = 0; 965237fead6SMichael Halcrow struct dentry *lower_dentry; 966237fead6SMichael Halcrow 967237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 968237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 969237fead6SMichael Halcrow rc = -ENOSYS; 970237fead6SMichael Halcrow goto out; 971237fead6SMichael Halcrow } 972237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 973237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, 974237fead6SMichael Halcrow size, flags); 975237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 976237fead6SMichael Halcrow out: 977237fead6SMichael Halcrow return rc; 978237fead6SMichael Halcrow } 979237fead6SMichael Halcrow 980dd2a3b7aSMichael Halcrow ssize_t 981d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 982d7cdc5feSMichael Halcrow void *value, size_t size) 983d7cdc5feSMichael Halcrow { 984d7cdc5feSMichael Halcrow int rc = 0; 985d7cdc5feSMichael Halcrow 986d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 987d7cdc5feSMichael Halcrow rc = -ENOSYS; 988d7cdc5feSMichael Halcrow goto out; 989d7cdc5feSMichael Halcrow } 990d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 991d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 992d7cdc5feSMichael Halcrow size); 993d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 994d7cdc5feSMichael Halcrow out: 995d7cdc5feSMichael Halcrow return rc; 996d7cdc5feSMichael Halcrow } 997d7cdc5feSMichael Halcrow 9987896b631SAdrian Bunk static ssize_t 999237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1000237fead6SMichael Halcrow size_t size) 1001237fead6SMichael Halcrow { 10022ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10032ed92554SMichael Halcrow value, size); 1004237fead6SMichael Halcrow } 1005237fead6SMichael Halcrow 1006237fead6SMichael Halcrow static ssize_t 1007237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, 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->listxattr) { 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->listxattr(lower_dentry, list, size); 1019237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1020237fead6SMichael Halcrow out: 1021237fead6SMichael Halcrow return rc; 1022237fead6SMichael Halcrow } 1023237fead6SMichael Halcrow 1024237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1025237fead6SMichael Halcrow { 1026237fead6SMichael Halcrow int rc = 0; 1027237fead6SMichael Halcrow struct dentry *lower_dentry; 1028237fead6SMichael Halcrow 1029237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1030237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1031237fead6SMichael Halcrow rc = -ENOSYS; 1032237fead6SMichael Halcrow goto out; 1033237fead6SMichael Halcrow } 1034237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1035237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1036237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1037237fead6SMichael Halcrow out: 1038237fead6SMichael Halcrow return rc; 1039237fead6SMichael Halcrow } 1040237fead6SMichael Halcrow 1041237fead6SMichael Halcrow int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) 1042237fead6SMichael Halcrow { 1043237fead6SMichael Halcrow if ((ecryptfs_inode_to_lower(inode) 1044237fead6SMichael Halcrow == (struct inode *)candidate_lower_inode)) 1045237fead6SMichael Halcrow return 1; 1046237fead6SMichael Halcrow else 1047237fead6SMichael Halcrow return 0; 1048237fead6SMichael Halcrow } 1049237fead6SMichael Halcrow 1050237fead6SMichael Halcrow int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 1051237fead6SMichael Halcrow { 1052237fead6SMichael Halcrow ecryptfs_init_inode(inode, (struct inode *)lower_inode); 1053237fead6SMichael Halcrow return 0; 1054237fead6SMichael Halcrow } 1055237fead6SMichael Halcrow 1056754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1057237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1058237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1059237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1060237fead6SMichael Halcrow .permission = ecryptfs_permission, 1061237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1062237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1063237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1064237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1065237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1066237fead6SMichael Halcrow }; 1067237fead6SMichael Halcrow 1068754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1069237fead6SMichael Halcrow .create = ecryptfs_create, 1070237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1071237fead6SMichael Halcrow .link = ecryptfs_link, 1072237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1073237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1074237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1075237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1076237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1077237fead6SMichael Halcrow .rename = ecryptfs_rename, 1078237fead6SMichael Halcrow .permission = ecryptfs_permission, 1079237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1080237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1081237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1082237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1083237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1084237fead6SMichael Halcrow }; 1085237fead6SMichael Halcrow 1086754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1087237fead6SMichael Halcrow .permission = ecryptfs_permission, 1088237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1089237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1090237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1091237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1092237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1093237fead6SMichael Halcrow }; 1094