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> 345a0e3ad6STejun Heo #include <linux/slab.h> 350a688ad7SHarvey Harrison #include <asm/unaligned.h> 36237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 37237fead6SMichael Halcrow 38237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 39237fead6SMichael Halcrow { 40237fead6SMichael Halcrow struct dentry *dir; 41237fead6SMichael Halcrow 428dc4e373SMiklos Szeredi dir = dget_parent(dentry); 43908e0a8aSPeter Zijlstra mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); 44237fead6SMichael Halcrow return dir; 45237fead6SMichael Halcrow } 46237fead6SMichael Halcrow 47237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 48237fead6SMichael Halcrow { 49237fead6SMichael Halcrow mutex_unlock(&dir->d_inode->i_mutex); 50237fead6SMichael Halcrow dput(dir); 51237fead6SMichael Halcrow } 52237fead6SMichael Halcrow 53237fead6SMichael Halcrow /** 54237fead6SMichael Halcrow * ecryptfs_create_underlying_file 55237fead6SMichael Halcrow * @lower_dir_inode: inode of the parent in the lower fs of the new file 56f70f582fSQinghuang Feng * @dentry: New file's dentry 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 inode *ecryptfs_dir_inode, 251addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 252237fead6SMichael Halcrow { 253237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 254237fead6SMichael Halcrow struct vfsmount *lower_mnt; 255addd65adSMichael Halcrow struct inode *lower_inode; 256e77a56ddSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 2572aac0cf8STyler Hicks struct ecryptfs_crypt_stat *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, 2863469b573SErez Zadok ecryptfs_dir_inode->i_sb, 2873469b573SErez Zadok ECRYPTFS_INTERPOSE_FLAG_D_ADD); 288237fead6SMichael Halcrow if (rc) { 289addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 290addd65adSMichael Halcrow __func__, rc); 291391b52f9SMichael Halcrow goto out; 292237fead6SMichael Halcrow } 293addd65adSMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) 294237fead6SMichael Halcrow goto out; 295addd65adSMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) 296237fead6SMichael Halcrow goto out; 297addd65adSMichael Halcrow if (special_file(lower_inode->i_mode)) 298202a21d6SRyusuke Konishi goto out; 299addd65adSMichael Halcrow if (!ecryptfs_nd) 300237fead6SMichael Halcrow goto out; 301237fead6SMichael Halcrow /* Released in this function */ 302addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 303237fead6SMichael Halcrow if (!page_virt) { 304addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 305addd65adSMichael Halcrow __func__); 306237fead6SMichael Halcrow rc = -ENOMEM; 307391b52f9SMichael Halcrow goto out; 308237fead6SMichael Halcrow } 309addd65adSMichael Halcrow if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { 310addd65adSMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 311391b52f9SMichael Halcrow if (rc) { 312391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 313391b52f9SMichael Halcrow "the persistent file for the dentry with name " 314391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 315addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 316addd65adSMichael Halcrow goto out_free_kmem; 317391b52f9SMichael Halcrow } 318391b52f9SMichael Halcrow } 3192aac0cf8STyler Hicks crypt_stat = &ecryptfs_inode_to_private( 3202aac0cf8STyler Hicks ecryptfs_dentry->d_inode)->crypt_stat; 3212aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3222aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3232aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 324d7cdc5feSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, 325addd65adSMichael Halcrow ecryptfs_dentry->d_inode); 326237fead6SMichael Halcrow if (rc) { 327addd65adSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, 328addd65adSMichael Halcrow ecryptfs_dentry); 329dd2a3b7aSMichael Halcrow if (rc) { 330237fead6SMichael Halcrow rc = 0; 331addd65adSMichael Halcrow goto out_free_kmem; 332237fead6SMichael Halcrow } 333dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 334dd2a3b7aSMichael Halcrow } 335e77a56ddSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 336addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 337e77a56ddSMichael Halcrow if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { 338e77a56ddSMichael Halcrow if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 339cc11beffSMichael Halcrow file_size = (crypt_stat->num_header_bytes_at_front 340e77a56ddSMichael Halcrow + i_size_read(lower_dentry->d_inode)); 341e77a56ddSMichael Halcrow else 342e77a56ddSMichael Halcrow file_size = i_size_read(lower_dentry->d_inode); 343e77a56ddSMichael Halcrow } else { 3440a688ad7SHarvey Harrison file_size = get_unaligned_be64(page_virt); 345e77a56ddSMichael Halcrow } 346addd65adSMichael Halcrow i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); 347addd65adSMichael Halcrow out_free_kmem: 348237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 349237fead6SMichael Halcrow goto out; 350237fead6SMichael Halcrow out_dput: 351237fead6SMichael Halcrow dput(lower_dentry); 352addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 353237fead6SMichael Halcrow out: 354addd65adSMichael Halcrow return rc; 355addd65adSMichael Halcrow } 356addd65adSMichael Halcrow 357addd65adSMichael Halcrow /** 358addd65adSMichael Halcrow * ecryptfs_lookup 359addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 360addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 361addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 362addd65adSMichael Halcrow * 363addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 364addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 365addd65adSMichael Halcrow */ 366addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 367addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 368addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 369addd65adSMichael Halcrow { 370addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 371a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 372addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 373addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 374addd65adSMichael Halcrow int rc = 0; 375addd65adSMichael Halcrow 376addd65adSMichael Halcrow ecryptfs_dentry->d_op = &ecryptfs_dops; 377addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 378addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 379addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 380addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 381addd65adSMichael Halcrow goto out_d_drop; 382addd65adSMichael Halcrow } 383addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 384ca8e34f2STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 385addd65adSMichael Halcrow lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 386addd65adSMichael Halcrow lower_dir_dentry, 387addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 388ca8e34f2STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 389addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 390addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 391addd65adSMichael Halcrow printk(KERN_ERR "%s: lookup_one_len() returned [%d] on " 392addd65adSMichael Halcrow "lower_dentry = [%s]\n", __func__, rc, 393addd65adSMichael Halcrow ecryptfs_dentry->d_name.name); 394addd65adSMichael Halcrow goto out_d_drop; 395addd65adSMichael Halcrow } 396addd65adSMichael Halcrow if (lower_dentry->d_inode) 397addd65adSMichael Halcrow goto lookup_and_interpose; 398addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 399addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4002aac0cf8STyler Hicks if (!(mount_crypt_stat 4012aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 402addd65adSMichael Halcrow goto lookup_and_interpose; 403addd65adSMichael Halcrow dput(lower_dentry); 404addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 405addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4062aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 407addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 408addd65adSMichael Halcrow if (rc) { 409addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 410addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 411addd65adSMichael Halcrow goto out_d_drop; 412addd65adSMichael Halcrow } 413ca8e34f2STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 414addd65adSMichael Halcrow lower_dentry = lookup_one_len(encrypted_and_encoded_name, 415addd65adSMichael Halcrow lower_dir_dentry, 416addd65adSMichael Halcrow encrypted_and_encoded_name_size - 1); 417ca8e34f2STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 418addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 419addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 420addd65adSMichael Halcrow printk(KERN_ERR "%s: lookup_one_len() returned [%d] on " 421addd65adSMichael Halcrow "lower_dentry = [%s]\n", __func__, rc, 422addd65adSMichael Halcrow encrypted_and_encoded_name); 423addd65adSMichael Halcrow goto out_d_drop; 424addd65adSMichael Halcrow } 425addd65adSMichael Halcrow lookup_and_interpose: 426addd65adSMichael Halcrow rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, 4272aac0cf8STyler Hicks ecryptfs_dir_inode, 428addd65adSMichael Halcrow ecryptfs_nd); 429addd65adSMichael Halcrow goto out; 430addd65adSMichael Halcrow out_d_drop: 431addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 432addd65adSMichael Halcrow out: 433addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 434237fead6SMichael Halcrow return ERR_PTR(rc); 435237fead6SMichael Halcrow } 436237fead6SMichael Halcrow 437237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 438237fead6SMichael Halcrow struct dentry *new_dentry) 439237fead6SMichael Halcrow { 440237fead6SMichael Halcrow struct dentry *lower_old_dentry; 441237fead6SMichael Halcrow struct dentry *lower_new_dentry; 442237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 443237fead6SMichael Halcrow u64 file_size_save; 444237fead6SMichael Halcrow int rc; 445237fead6SMichael Halcrow 446237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 447237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 448237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 449237fead6SMichael Halcrow dget(lower_old_dentry); 450237fead6SMichael Halcrow dget(lower_new_dentry); 451237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 452237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 453237fead6SMichael Halcrow lower_new_dentry); 454237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 455237fead6SMichael Halcrow goto out_lock; 456237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 457237fead6SMichael Halcrow if (rc) 458237fead6SMichael Halcrow goto out_lock; 4590cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); 4600cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); 461237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 462237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 463237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 464237fead6SMichael Halcrow out_lock: 465237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 466237fead6SMichael Halcrow dput(lower_new_dentry); 467237fead6SMichael Halcrow dput(lower_old_dentry); 468237fead6SMichael Halcrow return rc; 469237fead6SMichael Halcrow } 470237fead6SMichael Halcrow 471237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 472237fead6SMichael Halcrow { 473237fead6SMichael Halcrow int rc = 0; 474237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 475237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 4768dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 477237fead6SMichael Halcrow 4789c2d2056STyler Hicks dget(lower_dentry); 4798dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 480237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 481237fead6SMichael Halcrow if (rc) { 482ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 483237fead6SMichael Halcrow goto out_unlock; 484237fead6SMichael Halcrow } 4850cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 486237fead6SMichael Halcrow dentry->d_inode->i_nlink = 487237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 488237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 489caeeeecfSMichael Halcrow d_drop(dentry); 490237fead6SMichael Halcrow out_unlock: 4918dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 4929c2d2056STyler Hicks dput(lower_dentry); 493237fead6SMichael Halcrow return rc; 494237fead6SMichael Halcrow } 495237fead6SMichael Halcrow 496237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 497237fead6SMichael Halcrow const char *symname) 498237fead6SMichael Halcrow { 499237fead6SMichael Halcrow int rc; 500237fead6SMichael Halcrow struct dentry *lower_dentry; 501237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 502237fead6SMichael Halcrow char *encoded_symname; 503addd65adSMichael Halcrow size_t encoded_symlen; 504addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 505237fead6SMichael Halcrow 506237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 507237fead6SMichael Halcrow dget(lower_dentry); 508237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 509addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 510addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 511addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 512addd65adSMichael Halcrow &encoded_symlen, 513addd65adSMichael Halcrow NULL, 514addd65adSMichael Halcrow mount_crypt_stat, symname, 515addd65adSMichael Halcrow strlen(symname)); 516addd65adSMichael Halcrow if (rc) 517237fead6SMichael Halcrow goto out_lock; 518237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 519db2e747bSMiklos Szeredi encoded_symname); 520237fead6SMichael Halcrow kfree(encoded_symname); 521237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 522237fead6SMichael Halcrow goto out_lock; 523237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 524237fead6SMichael Halcrow if (rc) 525237fead6SMichael Halcrow goto out_lock; 5260cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5270cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 528237fead6SMichael Halcrow out_lock: 529237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 530237fead6SMichael Halcrow dput(lower_dentry); 531237fead6SMichael Halcrow if (!dentry->d_inode) 532237fead6SMichael Halcrow d_drop(dentry); 533237fead6SMichael Halcrow return rc; 534237fead6SMichael Halcrow } 535237fead6SMichael Halcrow 536237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 537237fead6SMichael Halcrow { 538237fead6SMichael Halcrow int rc; 539237fead6SMichael Halcrow struct dentry *lower_dentry; 540237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 541237fead6SMichael Halcrow 542237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 543237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 544237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 545237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 546237fead6SMichael Halcrow goto out; 547237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 548237fead6SMichael Halcrow if (rc) 549237fead6SMichael Halcrow goto out; 5500cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5510cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 552237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 553237fead6SMichael Halcrow out: 554237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 555237fead6SMichael Halcrow if (!dentry->d_inode) 556237fead6SMichael Halcrow d_drop(dentry); 557237fead6SMichael Halcrow return rc; 558237fead6SMichael Halcrow } 559237fead6SMichael Halcrow 560237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 561237fead6SMichael Halcrow { 562237fead6SMichael Halcrow struct dentry *lower_dentry; 563237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 56445ec4abaSMichael Halcrow int rc; 565237fead6SMichael Halcrow 566237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 56745ec4abaSMichael Halcrow dget(dentry); 568237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 56945ec4abaSMichael Halcrow dget(lower_dentry); 570237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 57145ec4abaSMichael Halcrow dput(lower_dentry); 57245ec4abaSMichael Halcrow if (!rc) 57345ec4abaSMichael Halcrow d_delete(lower_dentry); 5740cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 575237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 576237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 577237fead6SMichael Halcrow if (!rc) 578237fead6SMichael Halcrow d_drop(dentry); 57945ec4abaSMichael Halcrow dput(dentry); 580237fead6SMichael Halcrow return rc; 581237fead6SMichael Halcrow } 582237fead6SMichael Halcrow 583237fead6SMichael Halcrow static int 584237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 585237fead6SMichael Halcrow { 586237fead6SMichael Halcrow int rc; 587237fead6SMichael Halcrow struct dentry *lower_dentry; 588237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 589237fead6SMichael Halcrow 590237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 591237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 592237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 593237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 594237fead6SMichael Halcrow goto out; 595391b52f9SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 596237fead6SMichael Halcrow if (rc) 597237fead6SMichael Halcrow goto out; 5980cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5990cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 600237fead6SMichael Halcrow out: 601237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 602237fead6SMichael Halcrow if (!dentry->d_inode) 603237fead6SMichael Halcrow d_drop(dentry); 604237fead6SMichael Halcrow return rc; 605237fead6SMichael Halcrow } 606237fead6SMichael Halcrow 607237fead6SMichael Halcrow static int 608237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 609237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 610237fead6SMichael Halcrow { 611237fead6SMichael Halcrow int rc; 612237fead6SMichael Halcrow struct dentry *lower_old_dentry; 613237fead6SMichael Halcrow struct dentry *lower_new_dentry; 614237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 615237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6160d132f73SErez Zadok struct dentry *trap = NULL; 617237fead6SMichael Halcrow 618237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 619237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 620237fead6SMichael Halcrow dget(lower_old_dentry); 621237fead6SMichael Halcrow dget(lower_new_dentry); 622237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 623237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6240d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6250d132f73SErez Zadok /* source should not be ancestor of target */ 6260d132f73SErez Zadok if (trap == lower_old_dentry) { 6270d132f73SErez Zadok rc = -EINVAL; 6280d132f73SErez Zadok goto out_lock; 6290d132f73SErez Zadok } 6300d132f73SErez Zadok /* target should not be ancestor of source */ 6310d132f73SErez Zadok if (trap == lower_new_dentry) { 6320d132f73SErez Zadok rc = -ENOTEMPTY; 6330d132f73SErez Zadok goto out_lock; 6340d132f73SErez Zadok } 635237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 636237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 637237fead6SMichael Halcrow if (rc) 638237fead6SMichael Halcrow goto out_lock; 6399afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 640237fead6SMichael Halcrow if (new_dir != old_dir) 6419afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 642237fead6SMichael Halcrow out_lock: 643237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 644a9083081SMichael Halcrow dput(lower_new_dentry->d_parent); 645a9083081SMichael Halcrow dput(lower_old_dentry->d_parent); 646237fead6SMichael Halcrow dput(lower_new_dentry); 647237fead6SMichael Halcrow dput(lower_old_dentry); 648237fead6SMichael Halcrow return rc; 649237fead6SMichael Halcrow } 650237fead6SMichael Halcrow 651237fead6SMichael Halcrow static int 652237fead6SMichael Halcrow ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 653237fead6SMichael Halcrow { 654237fead6SMichael Halcrow char *lower_buf; 6553a6b42caSTyler Hicks size_t lower_bufsiz; 656addd65adSMichael Halcrow struct dentry *lower_dentry; 6573a6b42caSTyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 658addd65adSMichael Halcrow char *plaintext_name; 659addd65adSMichael Halcrow size_t plaintext_name_size; 660addd65adSMichael Halcrow mm_segment_t old_fs; 661addd65adSMichael Halcrow int rc; 662237fead6SMichael Halcrow 663237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 664acfa4380SAl Viro if (!lower_dentry->d_inode->i_op->readlink) { 665237fead6SMichael Halcrow rc = -EINVAL; 666237fead6SMichael Halcrow goto out; 667237fead6SMichael Halcrow } 6683a6b42caSTyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 6693a6b42caSTyler Hicks dentry->d_sb)->mount_crypt_stat; 6703a6b42caSTyler Hicks /* 6713a6b42caSTyler Hicks * If the lower filename is encrypted, it will result in a significantly 6723a6b42caSTyler Hicks * longer name. If needed, truncate the name after decode and decrypt. 6733a6b42caSTyler Hicks */ 6743a6b42caSTyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) 6753a6b42caSTyler Hicks lower_bufsiz = PATH_MAX; 6763a6b42caSTyler Hicks else 6773a6b42caSTyler Hicks lower_bufsiz = bufsiz; 678237fead6SMichael Halcrow /* Released in this function */ 6793a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 680237fead6SMichael Halcrow if (lower_buf == NULL) { 681addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting to " 682802b352fSRandy Dunlap "kmalloc [%zd] bytes\n", __func__, lower_bufsiz); 683237fead6SMichael Halcrow rc = -ENOMEM; 684237fead6SMichael Halcrow goto out; 685237fead6SMichael Halcrow } 686237fead6SMichael Halcrow old_fs = get_fs(); 687237fead6SMichael Halcrow set_fs(get_ds()); 688237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 689237fead6SMichael Halcrow (char __user *)lower_buf, 6903a6b42caSTyler Hicks lower_bufsiz); 691237fead6SMichael Halcrow set_fs(old_fs); 692237fead6SMichael Halcrow if (rc >= 0) { 693addd65adSMichael Halcrow rc = ecryptfs_decode_and_decrypt_filename(&plaintext_name, 694addd65adSMichael Halcrow &plaintext_name_size, 695addd65adSMichael Halcrow dentry, lower_buf, 696addd65adSMichael Halcrow rc); 697addd65adSMichael Halcrow if (rc) { 698addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to decode and " 699addd65adSMichael Halcrow "decrypt filename; rc = [%d]\n", __func__, 700addd65adSMichael Halcrow rc); 701237fead6SMichael Halcrow goto out_free_lower_buf; 702237fead6SMichael Halcrow } 7033a6b42caSTyler Hicks /* Check for bufsiz <= 0 done in sys_readlinkat() */ 7043a6b42caSTyler Hicks rc = copy_to_user(buf, plaintext_name, 705ac20100dSTyler Hicks min((size_t) bufsiz, plaintext_name_size)); 706addd65adSMichael Halcrow if (rc) 707addd65adSMichael Halcrow rc = -EFAULT; 708addd65adSMichael Halcrow else 709addd65adSMichael Halcrow rc = plaintext_name_size; 710addd65adSMichael Halcrow kfree(plaintext_name); 711addd65adSMichael Halcrow fsstack_copy_attr_atime(dentry->d_inode, lower_dentry->d_inode); 712237fead6SMichael Halcrow } 713237fead6SMichael Halcrow out_free_lower_buf: 714237fead6SMichael Halcrow kfree(lower_buf); 715237fead6SMichael Halcrow out: 716237fead6SMichael Halcrow return rc; 717237fead6SMichael Halcrow } 718237fead6SMichael Halcrow 719237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 720237fead6SMichael Halcrow { 721237fead6SMichael Halcrow char *buf; 722237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 723237fead6SMichael Halcrow mm_segment_t old_fs; 724237fead6SMichael Halcrow 725237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 726237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 727237fead6SMichael Halcrow if (!buf) { 728806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 729237fead6SMichael Halcrow goto out; 730237fead6SMichael Halcrow } 731237fead6SMichael Halcrow old_fs = get_fs(); 732237fead6SMichael Halcrow set_fs(get_ds()); 733237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 734237fead6SMichael Halcrow set_fs(old_fs); 735806892e9SOGAWA Hirofumi if (rc < 0) { 736237fead6SMichael Halcrow kfree(buf); 737806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 738806892e9SOGAWA Hirofumi } else 739806892e9SOGAWA Hirofumi buf[rc] = '\0'; 740237fead6SMichael Halcrow out: 741806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 742806892e9SOGAWA Hirofumi return NULL; 743237fead6SMichael Halcrow } 744237fead6SMichael Halcrow 745237fead6SMichael Halcrow static void 746237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 747237fead6SMichael Halcrow { 748806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 749806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 750237fead6SMichael Halcrow /* Free the char* */ 751806892e9SOGAWA Hirofumi kfree(buf); 752806892e9SOGAWA Hirofumi } 753237fead6SMichael Halcrow } 754237fead6SMichael Halcrow 755237fead6SMichael Halcrow /** 756237fead6SMichael Halcrow * upper_size_to_lower_size 757237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 758237fead6SMichael Halcrow * @upper_size: Size of the upper file 759237fead6SMichael Halcrow * 760cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 761237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 762237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 763237fead6SMichael Halcrow * 764237fead6SMichael Halcrow * Returns Calculated size of the lower file. 765237fead6SMichael Halcrow */ 766237fead6SMichael Halcrow static loff_t 767237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 768237fead6SMichael Halcrow loff_t upper_size) 769237fead6SMichael Halcrow { 770237fead6SMichael Halcrow loff_t lower_size; 771237fead6SMichael Halcrow 772cc11beffSMichael Halcrow lower_size = crypt_stat->num_header_bytes_at_front; 773237fead6SMichael Halcrow if (upper_size != 0) { 774237fead6SMichael Halcrow loff_t num_extents; 775237fead6SMichael Halcrow 776237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 777237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 778237fead6SMichael Halcrow num_extents++; 779237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 780237fead6SMichael Halcrow } 781237fead6SMichael Halcrow return lower_size; 782237fead6SMichael Halcrow } 783237fead6SMichael Halcrow 784237fead6SMichael Halcrow /** 7855f3ef64fSTyler Hicks * truncate_upper 786237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7875f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7885f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 789237fead6SMichael Halcrow * 790237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 791237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7925f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7935f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7945f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7955f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7965f3ef64fSTyler Hicks * the truncation of the lower inode. 797237fead6SMichael Halcrow * 798237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 799237fead6SMichael Halcrow */ 8005f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 8015f3ef64fSTyler Hicks struct iattr *lower_ia) 802237fead6SMichael Halcrow { 803237fead6SMichael Halcrow int rc = 0; 804237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 805237fead6SMichael Halcrow struct dentry *lower_dentry; 8062ed92554SMichael Halcrow struct file fake_ecryptfs_file; 807237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 808237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 809237fead6SMichael Halcrow loff_t lower_size_before_truncate; 810237fead6SMichael Halcrow loff_t lower_size_after_truncate; 811237fead6SMichael Halcrow 8125f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 8135f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 814237fead6SMichael Halcrow goto out; 8155f3ef64fSTyler Hicks } 816237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 817237fead6SMichael Halcrow /* Set up a fake ecryptfs file, this is used to interface with 818237fead6SMichael Halcrow * the file in the underlying filesystem so that the 819237fead6SMichael Halcrow * truncation has an effect there as well. */ 820237fead6SMichael Halcrow memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); 821bd243a4bSJosef "Jeff" Sipek fake_ecryptfs_file.f_path.dentry = dentry; 822237fead6SMichael Halcrow /* Released at out_free: label */ 823237fead6SMichael Halcrow ecryptfs_set_file_private(&fake_ecryptfs_file, 824237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_file_info_cache, 825e94b1766SChristoph Lameter GFP_KERNEL)); 826237fead6SMichael Halcrow if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { 827237fead6SMichael Halcrow rc = -ENOMEM; 828237fead6SMichael Halcrow goto out; 829237fead6SMichael Halcrow } 830237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 8312ed92554SMichael Halcrow ecryptfs_set_file_lower( 8322ed92554SMichael Halcrow &fake_ecryptfs_file, 8332ed92554SMichael Halcrow ecryptfs_inode_to_private(dentry->d_inode)->lower_file); 834237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 8355f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 8362ed92554SMichael Halcrow char zero[] = { 0x00 }; 837240e2df5SMichael Halcrow 8385f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 8392ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 8402ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 8412ed92554SMichael Halcrow * the intermediate portion of the previous end of the 8422ed92554SMichael Halcrow * file and the new and of the file */ 8432ed92554SMichael Halcrow rc = ecryptfs_write(&fake_ecryptfs_file, zero, 8445f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 8455f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 8465f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 8475f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 8485f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8492ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8502ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8515f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8522ed92554SMichael Halcrow 85313a791b4STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8545f3ef64fSTyler Hicks rc = vmtruncate(inode, ia->ia_size); 85513a791b4STyler Hicks if (rc) 85613a791b4STyler Hicks goto out_free; 8575f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8585f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 85913a791b4STyler Hicks goto out_free; 86013a791b4STyler Hicks } 8612ed92554SMichael Halcrow if (num_zeros) { 8622ed92554SMichael Halcrow char *zeros_virt; 8632ed92554SMichael Halcrow 8642ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8652ed92554SMichael Halcrow if (!zeros_virt) { 8662ed92554SMichael Halcrow rc = -ENOMEM; 8672ed92554SMichael Halcrow goto out_free; 868240e2df5SMichael Halcrow } 8692ed92554SMichael Halcrow rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt, 8705f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8712ed92554SMichael Halcrow kfree(zeros_virt); 8725dda6992SMichael Halcrow if (rc) { 873240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 874240e2df5SMichael Halcrow "the remainder of the end page on " 875240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 8762ed92554SMichael Halcrow goto out_free; 877240e2df5SMichael Halcrow } 878240e2df5SMichael Halcrow } 8795f3ef64fSTyler Hicks vmtruncate(inode, ia->ia_size); 8800216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 881dd2a3b7aSMichael Halcrow if (rc) { 882dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 883dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 884dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 8852ed92554SMichael Halcrow goto out_free; 886dd2a3b7aSMichael Halcrow } 887237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 888237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 889237fead6SMichael Halcrow lower_size_before_truncate = 890237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 891237fead6SMichael Halcrow lower_size_after_truncate = 8925f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8935f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8945f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8955f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8965f3ef64fSTyler Hicks } else 8975f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 898237fead6SMichael Halcrow } 899237fead6SMichael Halcrow out_free: 900237fead6SMichael Halcrow if (ecryptfs_file_to_private(&fake_ecryptfs_file)) 901237fead6SMichael Halcrow kmem_cache_free(ecryptfs_file_info_cache, 902237fead6SMichael Halcrow ecryptfs_file_to_private(&fake_ecryptfs_file)); 903237fead6SMichael Halcrow out: 904237fead6SMichael Halcrow return rc; 905237fead6SMichael Halcrow } 906237fead6SMichael Halcrow 9075f3ef64fSTyler Hicks /** 9085f3ef64fSTyler Hicks * ecryptfs_truncate 9095f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 9105f3ef64fSTyler Hicks * @new_length: The length to expand the file to 9115f3ef64fSTyler Hicks * 9125f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 9135f3ef64fSTyler Hicks * its corresponding lower inode. 9145f3ef64fSTyler Hicks * 9155f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 9165f3ef64fSTyler Hicks */ 9175f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 9185f3ef64fSTyler Hicks { 9195f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 9205f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 9215f3ef64fSTyler Hicks int rc; 9225f3ef64fSTyler Hicks 9235f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 9245f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 9255f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 9265f3ef64fSTyler Hicks 9275f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 9285f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9295f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 9305f3ef64fSTyler Hicks } 9315f3ef64fSTyler Hicks return rc; 9325f3ef64fSTyler Hicks } 9335f3ef64fSTyler Hicks 934237fead6SMichael Halcrow static int 935e6305c43SAl Viro ecryptfs_permission(struct inode *inode, int mask) 936237fead6SMichael Halcrow { 937f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 938237fead6SMichael Halcrow } 939237fead6SMichael Halcrow 940237fead6SMichael Halcrow /** 941237fead6SMichael Halcrow * ecryptfs_setattr 942237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 943237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 944237fead6SMichael Halcrow * 945237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 946237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 947237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 948237fead6SMichael Halcrow * 949237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 950237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 951237fead6SMichael Halcrow */ 952237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 953237fead6SMichael Halcrow { 954237fead6SMichael Halcrow int rc = 0; 955237fead6SMichael Halcrow struct dentry *lower_dentry; 9565f3ef64fSTyler Hicks struct iattr lower_ia; 957237fead6SMichael Halcrow struct inode *inode; 958237fead6SMichael Halcrow struct inode *lower_inode; 959237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 960237fead6SMichael Halcrow 961237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 962e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 963e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 964237fead6SMichael Halcrow inode = dentry->d_inode; 965237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 966e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 967e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 968e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 969e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 97064ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 97164ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 97264ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 973e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 974e10f281bSMichael Halcrow 975e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 976e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 977d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 9785dda6992SMichael Halcrow if (rc) { 979e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 980e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 981e10f281bSMichael Halcrow rc = -EIO; 98225bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 983e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 98425bd8174SMichael Halcrow "or the key could not be retrieved. " 98525bd8174SMichael Halcrow "Plaintext passthrough mode is not " 986e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 987e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 988e10f281bSMichael Halcrow goto out; 989e10f281bSMichael Halcrow } 990e10f281bSMichael Halcrow rc = 0; 991e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 992e10f281bSMichael Halcrow } 993e10f281bSMichael Halcrow } 994e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 9955f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9965f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9975f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 998237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9995f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 1000237fead6SMichael Halcrow if (rc < 0) 1001237fead6SMichael Halcrow goto out; 1002237fead6SMichael Halcrow } 10031ac564ecSJeff Layton 10041ac564ecSJeff Layton /* 10051ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 10061ac564ecSJeff Layton * to interpret this in its own way. 10071ac564ecSJeff Layton */ 10085f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 10095f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 10101ac564ecSJeff Layton 10119c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 10125f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 10139c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 1014237fead6SMichael Halcrow out: 10159afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 1016237fead6SMichael Halcrow return rc; 1017237fead6SMichael Halcrow } 1018237fead6SMichael Halcrow 1019f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1020f8f484d1STyler Hicks struct kstat *stat) 1021f8f484d1STyler Hicks { 1022f8f484d1STyler Hicks struct kstat lower_stat; 1023f8f484d1STyler Hicks int rc; 1024f8f484d1STyler Hicks 1025f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1026f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1027f8f484d1STyler Hicks if (!rc) { 1028f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1029f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1030f8f484d1STyler Hicks } 1031f8f484d1STyler Hicks return rc; 1032f8f484d1STyler Hicks } 1033f8f484d1STyler Hicks 1034dd2a3b7aSMichael Halcrow int 1035237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1036237fead6SMichael Halcrow size_t size, int flags) 1037237fead6SMichael Halcrow { 1038237fead6SMichael Halcrow int rc = 0; 1039237fead6SMichael Halcrow struct dentry *lower_dentry; 1040237fead6SMichael Halcrow 1041237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1042237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1043237fead6SMichael Halcrow rc = -ENOSYS; 1044237fead6SMichael Halcrow goto out; 1045237fead6SMichael Halcrow } 1046237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1047237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, 1048237fead6SMichael Halcrow size, flags); 1049237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1050237fead6SMichael Halcrow out: 1051237fead6SMichael Halcrow return rc; 1052237fead6SMichael Halcrow } 1053237fead6SMichael Halcrow 1054dd2a3b7aSMichael Halcrow ssize_t 1055d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1056d7cdc5feSMichael Halcrow void *value, size_t size) 1057d7cdc5feSMichael Halcrow { 1058d7cdc5feSMichael Halcrow int rc = 0; 1059d7cdc5feSMichael Halcrow 1060d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1061d7cdc5feSMichael Halcrow rc = -ENOSYS; 1062d7cdc5feSMichael Halcrow goto out; 1063d7cdc5feSMichael Halcrow } 1064d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1065d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1066d7cdc5feSMichael Halcrow size); 1067d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1068d7cdc5feSMichael Halcrow out: 1069d7cdc5feSMichael Halcrow return rc; 1070d7cdc5feSMichael Halcrow } 1071d7cdc5feSMichael Halcrow 10727896b631SAdrian Bunk static ssize_t 1073237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1074237fead6SMichael Halcrow size_t size) 1075237fead6SMichael Halcrow { 10762ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10772ed92554SMichael Halcrow value, size); 1078237fead6SMichael Halcrow } 1079237fead6SMichael Halcrow 1080237fead6SMichael Halcrow static ssize_t 1081237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1082237fead6SMichael Halcrow { 1083237fead6SMichael Halcrow int rc = 0; 1084237fead6SMichael Halcrow struct dentry *lower_dentry; 1085237fead6SMichael Halcrow 1086237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1087237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1088237fead6SMichael Halcrow rc = -ENOSYS; 1089237fead6SMichael Halcrow goto out; 1090237fead6SMichael Halcrow } 1091237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1092237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1093237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1094237fead6SMichael Halcrow out: 1095237fead6SMichael Halcrow return rc; 1096237fead6SMichael Halcrow } 1097237fead6SMichael Halcrow 1098237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1099237fead6SMichael Halcrow { 1100237fead6SMichael Halcrow int rc = 0; 1101237fead6SMichael Halcrow struct dentry *lower_dentry; 1102237fead6SMichael Halcrow 1103237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1104237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1105237fead6SMichael Halcrow rc = -ENOSYS; 1106237fead6SMichael Halcrow goto out; 1107237fead6SMichael Halcrow } 1108237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1109237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1110237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1111237fead6SMichael Halcrow out: 1112237fead6SMichael Halcrow return rc; 1113237fead6SMichael Halcrow } 1114237fead6SMichael Halcrow 1115237fead6SMichael Halcrow int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) 1116237fead6SMichael Halcrow { 1117237fead6SMichael Halcrow if ((ecryptfs_inode_to_lower(inode) 1118237fead6SMichael Halcrow == (struct inode *)candidate_lower_inode)) 1119237fead6SMichael Halcrow return 1; 1120237fead6SMichael Halcrow else 1121237fead6SMichael Halcrow return 0; 1122237fead6SMichael Halcrow } 1123237fead6SMichael Halcrow 1124237fead6SMichael Halcrow int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 1125237fead6SMichael Halcrow { 1126237fead6SMichael Halcrow ecryptfs_init_inode(inode, (struct inode *)lower_inode); 1127237fead6SMichael Halcrow return 0; 1128237fead6SMichael Halcrow } 1129237fead6SMichael Halcrow 1130754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1131237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1132237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1133237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1134237fead6SMichael Halcrow .permission = ecryptfs_permission, 1135237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1136237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1137237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1138237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1139237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1140237fead6SMichael Halcrow }; 1141237fead6SMichael Halcrow 1142754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1143237fead6SMichael Halcrow .create = ecryptfs_create, 1144237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1145237fead6SMichael Halcrow .link = ecryptfs_link, 1146237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1147237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1148237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1149237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1150237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1151237fead6SMichael Halcrow .rename = ecryptfs_rename, 1152237fead6SMichael Halcrow .permission = ecryptfs_permission, 1153237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1154237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1155237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1156237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1157237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1158237fead6SMichael Halcrow }; 1159237fead6SMichael Halcrow 1160754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1161237fead6SMichael Halcrow .permission = ecryptfs_permission, 1162237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1163f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1164237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1165237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1166237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1167237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1168237fead6SMichael Halcrow }; 1169