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> 3548b512e6SRoberto Sassu #include <linux/xattr.h> 360a688ad7SHarvey Harrison #include <asm/unaligned.h> 37237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 38237fead6SMichael Halcrow 39237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 40237fead6SMichael Halcrow { 41237fead6SMichael Halcrow struct dentry *dir; 42237fead6SMichael Halcrow 438dc4e373SMiklos Szeredi dir = dget_parent(dentry); 44908e0a8aSPeter Zijlstra mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); 45237fead6SMichael Halcrow return dir; 46237fead6SMichael Halcrow } 47237fead6SMichael Halcrow 48237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 49237fead6SMichael Halcrow { 50237fead6SMichael Halcrow mutex_unlock(&dir->d_inode->i_mutex); 51237fead6SMichael Halcrow dput(dir); 52237fead6SMichael Halcrow } 53237fead6SMichael Halcrow 54c4f79073STyler Hicks static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) 55c4f79073STyler Hicks { 56c4f79073STyler Hicks if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode) 57c4f79073STyler Hicks return 1; 58c4f79073STyler Hicks return 0; 59c4f79073STyler Hicks } 60c4f79073STyler Hicks 615ccf9203STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *opaque) 62c4f79073STyler Hicks { 635ccf9203STyler Hicks struct inode *lower_inode = opaque; 645ccf9203STyler Hicks 655ccf9203STyler Hicks ecryptfs_set_inode_lower(inode, lower_inode); 665ccf9203STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 675ccf9203STyler Hicks /* i_size will be overwritten for encrypted regular files */ 685ccf9203STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 695ccf9203STyler Hicks inode->i_ino = lower_inode->i_ino; 70c4f79073STyler Hicks inode->i_version++; 71c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 72985ca0e6SThieu Le inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; 735ccf9203STyler Hicks 745ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 755ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 765ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 775ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 785ccf9203STyler Hicks else 795ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 805ccf9203STyler Hicks 815ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 825ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 835ccf9203STyler Hicks else if (special_file(inode->i_mode)) 845ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 855ccf9203STyler Hicks else 865ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 875ccf9203STyler Hicks 88c4f79073STyler Hicks return 0; 89c4f79073STyler Hicks } 90c4f79073STyler Hicks 915ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 925ccf9203STyler Hicks struct super_block *sb) 935ccf9203STyler Hicks { 945ccf9203STyler Hicks struct inode *inode; 955ccf9203STyler Hicks 965ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 975ccf9203STyler Hicks return ERR_PTR(-EXDEV); 985ccf9203STyler Hicks if (!igrab(lower_inode)) 995ccf9203STyler Hicks return ERR_PTR(-ESTALE); 1005ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 1015ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 1025ccf9203STyler Hicks lower_inode); 1035ccf9203STyler Hicks if (!inode) { 1045ccf9203STyler Hicks iput(lower_inode); 1055ccf9203STyler Hicks return ERR_PTR(-EACCES); 1065ccf9203STyler Hicks } 1075ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 1085ccf9203STyler Hicks iput(lower_inode); 1095ccf9203STyler Hicks 1105ccf9203STyler Hicks return inode; 1115ccf9203STyler Hicks } 1125ccf9203STyler Hicks 113c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 114c4f79073STyler Hicks struct super_block *sb) 115c4f79073STyler Hicks { 1165ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 117c4f79073STyler Hicks 1185ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 119c4f79073STyler Hicks unlock_new_inode(inode); 1205ccf9203STyler Hicks 121c4f79073STyler Hicks return inode; 122c4f79073STyler Hicks } 123c4f79073STyler Hicks 124c4f79073STyler Hicks /** 125c4f79073STyler Hicks * ecryptfs_interpose 126c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 127c4f79073STyler Hicks * @dentry: ecryptfs' dentry 128c4f79073STyler Hicks * @sb: ecryptfs's super_block 129c4f79073STyler Hicks * 130c4f79073STyler Hicks * Interposes upper and lower dentries. 131c4f79073STyler Hicks * 132c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 133c4f79073STyler Hicks */ 134c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1355ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 136c4f79073STyler Hicks { 1375ccf9203STyler Hicks struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb); 1385ccf9203STyler Hicks 139c4f79073STyler Hicks if (IS_ERR(inode)) 140c4f79073STyler Hicks return PTR_ERR(inode); 141c4f79073STyler Hicks d_instantiate(dentry, inode); 1425ccf9203STyler Hicks 143c4f79073STyler Hicks return 0; 144c4f79073STyler Hicks } 145c4f79073STyler Hicks 146237fead6SMichael Halcrow /** 147237fead6SMichael Halcrow * ecryptfs_create_underlying_file 148237fead6SMichael Halcrow * @lower_dir_inode: inode of the parent in the lower fs of the new file 149f70f582fSQinghuang Feng * @dentry: New file's dentry 150237fead6SMichael Halcrow * @mode: The mode of the new file 151237fead6SMichael Halcrow * 152237fead6SMichael Halcrow * Creates the file in the lower file system. 153237fead6SMichael Halcrow * 154237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 155237fead6SMichael Halcrow */ 156237fead6SMichael Halcrow static int 157237fead6SMichael Halcrow ecryptfs_create_underlying_file(struct inode *lower_dir_inode, 158bf6c7f6cSAl Viro struct dentry *dentry, int mode) 159237fead6SMichael Halcrow { 160237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 161bf6c7f6cSAl Viro return vfs_create(lower_dir_inode, lower_dentry, mode, NULL); 162237fead6SMichael Halcrow } 163237fead6SMichael Halcrow 164237fead6SMichael Halcrow /** 165237fead6SMichael Halcrow * ecryptfs_do_create 166237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 167237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 168237fead6SMichael Halcrow * @mode: The mode of the new file 169237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 170237fead6SMichael Halcrow * 171237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 172237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 173237fead6SMichael Halcrow * stat of the lower directory inode. 174237fead6SMichael Halcrow * 175237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 176237fead6SMichael Halcrow */ 177237fead6SMichael Halcrow static int 178237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 179bf6c7f6cSAl Viro struct dentry *ecryptfs_dentry, int mode) 180237fead6SMichael Halcrow { 181237fead6SMichael Halcrow int rc; 182237fead6SMichael Halcrow struct dentry *lower_dentry; 183237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 184237fead6SMichael Halcrow 185237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 186237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 187801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 188237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 189237fead6SMichael Halcrow "dentry\n"); 190237fead6SMichael Halcrow rc = PTR_ERR(lower_dir_dentry); 191237fead6SMichael Halcrow goto out; 192237fead6SMichael Halcrow } 193237fead6SMichael Halcrow rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, 194bf6c7f6cSAl Viro ecryptfs_dentry, mode); 1954981e081SMichael Halcrow if (rc) { 196caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 19718d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 198237fead6SMichael Halcrow goto out_lock; 199237fead6SMichael Halcrow } 200237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 2015ccf9203STyler Hicks directory_inode->i_sb); 202237fead6SMichael Halcrow if (rc) { 203237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); 204237fead6SMichael Halcrow goto out_lock; 205237fead6SMichael Halcrow } 2060cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 2070cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 208237fead6SMichael Halcrow out_lock: 209237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 210237fead6SMichael Halcrow out: 211237fead6SMichael Halcrow return rc; 212237fead6SMichael Halcrow } 213237fead6SMichael Halcrow 214237fead6SMichael Halcrow /** 215237fead6SMichael Halcrow * ecryptfs_initialize_file 216237fead6SMichael Halcrow * 217237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 218237fead6SMichael Halcrow * file with a header and first data page. 219237fead6SMichael Halcrow * 220237fead6SMichael Halcrow * Returns zero on success 221237fead6SMichael Halcrow */ 222237fead6SMichael Halcrow static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) 223237fead6SMichael Halcrow { 224d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 225d7cdc5feSMichael Halcrow &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; 226237fead6SMichael Halcrow int rc = 0; 227237fead6SMichael Halcrow 228237fead6SMichael Halcrow if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { 229237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 230e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 231d7cdc5feSMichael Halcrow goto out; 232237fead6SMichael Halcrow } 233237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 234237fead6SMichael Halcrow rc = ecryptfs_new_file_context(ecryptfs_dentry); 235237fead6SMichael Halcrow if (rc) { 236d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 237d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 238d7cdc5feSMichael Halcrow goto out; 239237fead6SMichael Halcrow } 2403b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, 2413b06b3ebSTyler Hicks ecryptfs_dentry->d_inode); 242391b52f9SMichael Halcrow if (rc) { 243391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 244332ab16fSTyler Hicks "the lower file for the dentry with name " 245391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 246391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 247391b52f9SMichael Halcrow goto out; 248391b52f9SMichael Halcrow } 249d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 250332ab16fSTyler Hicks if (rc) 251d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 252332ab16fSTyler Hicks ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); 253237fead6SMichael Halcrow out: 254237fead6SMichael Halcrow return rc; 255237fead6SMichael Halcrow } 256237fead6SMichael Halcrow 257237fead6SMichael Halcrow /** 258237fead6SMichael Halcrow * ecryptfs_create 259237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 260237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 261237fead6SMichael Halcrow * @mode: The mode of the new file. 262237fead6SMichael Halcrow * @nd: nameidata 263237fead6SMichael Halcrow * 264237fead6SMichael Halcrow * Creates a new file. 265237fead6SMichael Halcrow * 266237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 267237fead6SMichael Halcrow */ 268237fead6SMichael Halcrow static int 269237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 270237fead6SMichael Halcrow int mode, struct nameidata *nd) 271237fead6SMichael Halcrow { 272237fead6SMichael Halcrow int rc; 273237fead6SMichael Halcrow 274addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 275bf6c7f6cSAl Viro rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode); 276237fead6SMichael Halcrow if (unlikely(rc)) { 277237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 278237fead6SMichael Halcrow "lower filesystem\n"); 279237fead6SMichael Halcrow goto out; 280237fead6SMichael Halcrow } 281237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 282237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 283237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 284237fead6SMichael Halcrow out: 285237fead6SMichael Halcrow return rc; 286237fead6SMichael Halcrow } 287237fead6SMichael Halcrow 288778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 289237fead6SMichael Halcrow { 2902aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 291778aeb42STyler Hicks int rc; 292237fead6SMichael Halcrow 293778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 294391b52f9SMichael Halcrow if (rc) { 295391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 296332ab16fSTyler Hicks "the lower file for the dentry with name " 297391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 298778aeb42STyler Hicks dentry->d_name.name, rc); 299778aeb42STyler Hicks return rc; 300391b52f9SMichael Halcrow } 301778aeb42STyler Hicks 3023b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3032aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3042aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3052aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 306778aeb42STyler Hicks 307778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 308778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 309237fead6SMichael Halcrow if (rc) { 310778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 311778aeb42STyler Hicks if (!rc) 312dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 313dd2a3b7aSMichael Halcrow } 314778aeb42STyler Hicks 315778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 316778aeb42STyler Hicks return 0; 317778aeb42STyler Hicks } 318778aeb42STyler Hicks 319778aeb42STyler Hicks /** 320778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 321778aeb42STyler Hicks */ 322778aeb42STyler Hicks static int ecryptfs_lookup_interpose(struct dentry *dentry, 323778aeb42STyler Hicks struct dentry *lower_dentry, 324778aeb42STyler Hicks struct inode *dir_inode) 325778aeb42STyler Hicks { 326778aeb42STyler Hicks struct inode *inode, *lower_inode = lower_dentry->d_inode; 327778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 328778aeb42STyler Hicks struct vfsmount *lower_mnt; 329778aeb42STyler Hicks int rc = 0; 330778aeb42STyler Hicks 331778aeb42STyler Hicks lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 332778aeb42STyler Hicks fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); 333778aeb42STyler Hicks BUG_ON(!lower_dentry->d_count); 334778aeb42STyler Hicks 335778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 336778aeb42STyler Hicks ecryptfs_set_dentry_private(dentry, dentry_info); 337778aeb42STyler Hicks if (!dentry_info) { 338778aeb42STyler Hicks printk(KERN_ERR "%s: Out of memory whilst attempting " 339778aeb42STyler Hicks "to allocate ecryptfs_dentry_info struct\n", 340778aeb42STyler Hicks __func__); 341237fead6SMichael Halcrow dput(lower_dentry); 34231f73beeSLino Sanfilippo mntput(lower_mnt); 343778aeb42STyler Hicks d_drop(dentry); 344778aeb42STyler Hicks return -ENOMEM; 345778aeb42STyler Hicks } 346778aeb42STyler Hicks ecryptfs_set_dentry_lower(dentry, lower_dentry); 347778aeb42STyler Hicks ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); 348778aeb42STyler Hicks 349778aeb42STyler Hicks if (!lower_dentry->d_inode) { 350778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 351778aeb42STyler Hicks d_add(dentry, NULL); 352778aeb42STyler Hicks return 0; 353778aeb42STyler Hicks } 354778aeb42STyler Hicks inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); 355778aeb42STyler Hicks if (IS_ERR(inode)) { 356778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 357778aeb42STyler Hicks __func__, PTR_ERR(inode)); 358778aeb42STyler Hicks return PTR_ERR(inode); 359778aeb42STyler Hicks } 360778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 361778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 362778aeb42STyler Hicks if (rc) { 363778aeb42STyler Hicks make_bad_inode(inode); 364778aeb42STyler Hicks return rc; 365778aeb42STyler Hicks } 366778aeb42STyler Hicks } 367778aeb42STyler Hicks 368778aeb42STyler Hicks if (inode->i_state & I_NEW) 369778aeb42STyler Hicks unlock_new_inode(inode); 370778aeb42STyler Hicks d_add(dentry, inode); 371778aeb42STyler Hicks 372addd65adSMichael Halcrow return rc; 373addd65adSMichael Halcrow } 374addd65adSMichael Halcrow 375addd65adSMichael Halcrow /** 376addd65adSMichael Halcrow * ecryptfs_lookup 377addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 378addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 379addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 380addd65adSMichael Halcrow * 381addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 382addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 383addd65adSMichael Halcrow */ 384addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 385addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 386addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 387addd65adSMichael Halcrow { 388addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 389a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 390addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 391addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 392addd65adSMichael Halcrow int rc = 0; 393addd65adSMichael Halcrow 394addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 395addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 396addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 397addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 398addd65adSMichael Halcrow goto out_d_drop; 399addd65adSMichael Halcrow } 400addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 4018787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4028787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 4038787c7a3STyler Hicks lower_dir_dentry, 4048787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 4058787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 406addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 407addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4088787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4099f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 4109f37622fSTyler Hicks encrypted_and_encoded_name); 411addd65adSMichael Halcrow goto out_d_drop; 412addd65adSMichael Halcrow } 413addd65adSMichael Halcrow if (lower_dentry->d_inode) 4145ccf9203STyler Hicks goto interpose; 415addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 416addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4172aac0cf8STyler Hicks if (!(mount_crypt_stat 4182aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 4195ccf9203STyler Hicks goto interpose; 420addd65adSMichael Halcrow dput(lower_dentry); 421addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 422addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4232aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 424addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 425addd65adSMichael Halcrow if (rc) { 426addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 427addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 428addd65adSMichael Halcrow goto out_d_drop; 429addd65adSMichael Halcrow } 4308787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4318787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4328787c7a3STyler Hicks lower_dir_dentry, 4338787c7a3STyler Hicks encrypted_and_encoded_name_size); 4348787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 435addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 436addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4378787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4389f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 439addd65adSMichael Halcrow encrypted_and_encoded_name); 440addd65adSMichael Halcrow goto out_d_drop; 441addd65adSMichael Halcrow } 4425ccf9203STyler Hicks interpose: 4435ccf9203STyler Hicks rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, 44470b89021STyler Hicks ecryptfs_dir_inode); 445addd65adSMichael Halcrow goto out; 446addd65adSMichael Halcrow out_d_drop: 447addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 448addd65adSMichael Halcrow out: 449addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 450237fead6SMichael Halcrow return ERR_PTR(rc); 451237fead6SMichael Halcrow } 452237fead6SMichael Halcrow 453237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 454237fead6SMichael Halcrow struct dentry *new_dentry) 455237fead6SMichael Halcrow { 456237fead6SMichael Halcrow struct dentry *lower_old_dentry; 457237fead6SMichael Halcrow struct dentry *lower_new_dentry; 458237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 459237fead6SMichael Halcrow u64 file_size_save; 460237fead6SMichael Halcrow int rc; 461237fead6SMichael Halcrow 462237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 463237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 464237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 465237fead6SMichael Halcrow dget(lower_old_dentry); 466237fead6SMichael Halcrow dget(lower_new_dentry); 467237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 468237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 469237fead6SMichael Halcrow lower_new_dentry); 470237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 471237fead6SMichael Halcrow goto out_lock; 4725ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 473237fead6SMichael Halcrow if (rc) 474237fead6SMichael Halcrow goto out_lock; 4753a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4763a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 477bfe86848SMiklos Szeredi set_nlink(old_dentry->d_inode, 478bfe86848SMiklos Szeredi ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); 479237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 480237fead6SMichael Halcrow out_lock: 481237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 482237fead6SMichael Halcrow dput(lower_new_dentry); 483237fead6SMichael Halcrow dput(lower_old_dentry); 484237fead6SMichael Halcrow return rc; 485237fead6SMichael Halcrow } 486237fead6SMichael Halcrow 487237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 488237fead6SMichael Halcrow { 489237fead6SMichael Halcrow int rc = 0; 490237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 491237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 4928dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 493237fead6SMichael Halcrow 4949c2d2056STyler Hicks dget(lower_dentry); 4958dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 496237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 497237fead6SMichael Halcrow if (rc) { 498ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 499237fead6SMichael Halcrow goto out_unlock; 500237fead6SMichael Halcrow } 5010cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 502bfe86848SMiklos Szeredi set_nlink(dentry->d_inode, 503bfe86848SMiklos Szeredi ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink); 504237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 505caeeeecfSMichael Halcrow d_drop(dentry); 506237fead6SMichael Halcrow out_unlock: 5078dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 5089c2d2056STyler Hicks dput(lower_dentry); 509237fead6SMichael Halcrow return rc; 510237fead6SMichael Halcrow } 511237fead6SMichael Halcrow 512237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 513237fead6SMichael Halcrow const char *symname) 514237fead6SMichael Halcrow { 515237fead6SMichael Halcrow int rc; 516237fead6SMichael Halcrow struct dentry *lower_dentry; 517237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 518237fead6SMichael Halcrow char *encoded_symname; 519addd65adSMichael Halcrow size_t encoded_symlen; 520addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 521237fead6SMichael Halcrow 522237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 523237fead6SMichael Halcrow dget(lower_dentry); 524237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 525addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 526addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 527addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 528addd65adSMichael Halcrow &encoded_symlen, 529addd65adSMichael Halcrow NULL, 530addd65adSMichael Halcrow mount_crypt_stat, symname, 531addd65adSMichael Halcrow strlen(symname)); 532addd65adSMichael Halcrow if (rc) 533237fead6SMichael Halcrow goto out_lock; 534237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 535db2e747bSMiklos Szeredi encoded_symname); 536237fead6SMichael Halcrow kfree(encoded_symname); 537237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 538237fead6SMichael Halcrow goto out_lock; 5395ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 540237fead6SMichael Halcrow if (rc) 541237fead6SMichael Halcrow goto out_lock; 5420cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5430cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 544237fead6SMichael Halcrow out_lock: 545237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 546237fead6SMichael Halcrow dput(lower_dentry); 547237fead6SMichael Halcrow if (!dentry->d_inode) 548237fead6SMichael Halcrow d_drop(dentry); 549237fead6SMichael Halcrow return rc; 550237fead6SMichael Halcrow } 551237fead6SMichael Halcrow 552237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 553237fead6SMichael Halcrow { 554237fead6SMichael Halcrow int rc; 555237fead6SMichael Halcrow struct dentry *lower_dentry; 556237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 557237fead6SMichael Halcrow 558237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 559237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 560237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 561237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 562237fead6SMichael Halcrow goto out; 5635ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 564237fead6SMichael Halcrow if (rc) 565237fead6SMichael Halcrow goto out; 5660cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5670cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 568bfe86848SMiklos Szeredi set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); 569237fead6SMichael Halcrow out: 570237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 571237fead6SMichael Halcrow if (!dentry->d_inode) 572237fead6SMichael Halcrow d_drop(dentry); 573237fead6SMichael Halcrow return rc; 574237fead6SMichael Halcrow } 575237fead6SMichael Halcrow 576237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 577237fead6SMichael Halcrow { 578237fead6SMichael Halcrow struct dentry *lower_dentry; 579237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 58045ec4abaSMichael Halcrow int rc; 581237fead6SMichael Halcrow 582237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 58345ec4abaSMichael Halcrow dget(dentry); 584237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 58545ec4abaSMichael Halcrow dget(lower_dentry); 586237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 58745ec4abaSMichael Halcrow dput(lower_dentry); 58807850552STyler Hicks if (!rc && dentry->d_inode) 58907850552STyler Hicks clear_nlink(dentry->d_inode); 5900cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 591bfe86848SMiklos Szeredi set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); 592237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 593237fead6SMichael Halcrow if (!rc) 594237fead6SMichael Halcrow d_drop(dentry); 59545ec4abaSMichael Halcrow dput(dentry); 596237fead6SMichael Halcrow return rc; 597237fead6SMichael Halcrow } 598237fead6SMichael Halcrow 599237fead6SMichael Halcrow static int 600237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 601237fead6SMichael Halcrow { 602237fead6SMichael Halcrow int rc; 603237fead6SMichael Halcrow struct dentry *lower_dentry; 604237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 605237fead6SMichael Halcrow 606237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 607237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 608237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 609237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 610237fead6SMichael Halcrow goto out; 6115ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 612237fead6SMichael Halcrow if (rc) 613237fead6SMichael Halcrow goto out; 6140cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6150cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 616237fead6SMichael Halcrow out: 617237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 618237fead6SMichael Halcrow if (!dentry->d_inode) 619237fead6SMichael Halcrow d_drop(dentry); 620237fead6SMichael Halcrow return rc; 621237fead6SMichael Halcrow } 622237fead6SMichael Halcrow 623237fead6SMichael Halcrow static int 624237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 625237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 626237fead6SMichael Halcrow { 627237fead6SMichael Halcrow int rc; 628237fead6SMichael Halcrow struct dentry *lower_old_dentry; 629237fead6SMichael Halcrow struct dentry *lower_new_dentry; 630237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 631237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6320d132f73SErez Zadok struct dentry *trap = NULL; 633237fead6SMichael Halcrow 634237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 635237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 636237fead6SMichael Halcrow dget(lower_old_dentry); 637237fead6SMichael Halcrow dget(lower_new_dentry); 638237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 639237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6400d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6410d132f73SErez Zadok /* source should not be ancestor of target */ 6420d132f73SErez Zadok if (trap == lower_old_dentry) { 6430d132f73SErez Zadok rc = -EINVAL; 6440d132f73SErez Zadok goto out_lock; 6450d132f73SErez Zadok } 6460d132f73SErez Zadok /* target should not be ancestor of source */ 6470d132f73SErez Zadok if (trap == lower_new_dentry) { 6480d132f73SErez Zadok rc = -ENOTEMPTY; 6490d132f73SErez Zadok goto out_lock; 6500d132f73SErez Zadok } 651237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 652237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 653237fead6SMichael Halcrow if (rc) 654237fead6SMichael Halcrow goto out_lock; 6559afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 656237fead6SMichael Halcrow if (new_dir != old_dir) 6579afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 658237fead6SMichael Halcrow out_lock: 659237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 660dd55c898STyler Hicks dput(lower_new_dir_dentry); 661dd55c898STyler Hicks dput(lower_old_dir_dentry); 662237fead6SMichael Halcrow dput(lower_new_dentry); 663237fead6SMichael Halcrow dput(lower_old_dentry); 664237fead6SMichael Halcrow return rc; 665237fead6SMichael Halcrow } 666237fead6SMichael Halcrow 6673a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6683a60a168STyler Hicks size_t *bufsiz) 669237fead6SMichael Halcrow { 6703a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 671237fead6SMichael Halcrow char *lower_buf; 6723a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 673addd65adSMichael Halcrow mm_segment_t old_fs; 674addd65adSMichael Halcrow int rc; 675237fead6SMichael Halcrow 6763a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 6773a60a168STyler Hicks if (!lower_buf) { 678237fead6SMichael Halcrow rc = -ENOMEM; 679237fead6SMichael Halcrow goto out; 680237fead6SMichael Halcrow } 681237fead6SMichael Halcrow old_fs = get_fs(); 682237fead6SMichael Halcrow set_fs(get_ds()); 683237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 684237fead6SMichael Halcrow (char __user *)lower_buf, 6853a6b42caSTyler Hicks lower_bufsiz); 686237fead6SMichael Halcrow set_fs(old_fs); 6873a60a168STyler Hicks if (rc < 0) 6883a60a168STyler Hicks goto out; 6893a60a168STyler Hicks lower_bufsiz = rc; 6903a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 6913a60a168STyler Hicks lower_buf, lower_bufsiz); 6923a60a168STyler Hicks out: 693237fead6SMichael Halcrow kfree(lower_buf); 6943a60a168STyler Hicks return rc; 6953a60a168STyler Hicks } 6963a60a168STyler Hicks 6973a60a168STyler Hicks static int 6983a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 6993a60a168STyler Hicks { 7003a60a168STyler Hicks char *kbuf; 7013a60a168STyler Hicks size_t kbufsiz, copied; 7023a60a168STyler Hicks int rc; 7033a60a168STyler Hicks 7043a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 7053a60a168STyler Hicks if (rc) 7063a60a168STyler Hicks goto out; 7073a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 7083a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 7093a60a168STyler Hicks kfree(kbuf); 7103a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 7113a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 712237fead6SMichael Halcrow out: 713237fead6SMichael Halcrow return rc; 714237fead6SMichael Halcrow } 715237fead6SMichael Halcrow 716237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 717237fead6SMichael Halcrow { 718237fead6SMichael Halcrow char *buf; 719237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 720237fead6SMichael Halcrow mm_segment_t old_fs; 721237fead6SMichael Halcrow 722237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 723237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 724237fead6SMichael Halcrow if (!buf) { 725806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 726237fead6SMichael Halcrow goto out; 727237fead6SMichael Halcrow } 728237fead6SMichael Halcrow old_fs = get_fs(); 729237fead6SMichael Halcrow set_fs(get_ds()); 730237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 731237fead6SMichael Halcrow set_fs(old_fs); 732806892e9SOGAWA Hirofumi if (rc < 0) { 733237fead6SMichael Halcrow kfree(buf); 734806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 735806892e9SOGAWA Hirofumi } else 736806892e9SOGAWA Hirofumi buf[rc] = '\0'; 737237fead6SMichael Halcrow out: 738806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 739806892e9SOGAWA Hirofumi return NULL; 740237fead6SMichael Halcrow } 741237fead6SMichael Halcrow 742237fead6SMichael Halcrow static void 743237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 744237fead6SMichael Halcrow { 745806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 746806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 747237fead6SMichael Halcrow /* Free the char* */ 748806892e9SOGAWA Hirofumi kfree(buf); 749806892e9SOGAWA Hirofumi } 750237fead6SMichael Halcrow } 751237fead6SMichael Halcrow 752237fead6SMichael Halcrow /** 753237fead6SMichael Halcrow * upper_size_to_lower_size 754237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 755237fead6SMichael Halcrow * @upper_size: Size of the upper file 756237fead6SMichael Halcrow * 757cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 758237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 759237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 760237fead6SMichael Halcrow * 761237fead6SMichael Halcrow * Returns Calculated size of the lower file. 762237fead6SMichael Halcrow */ 763237fead6SMichael Halcrow static loff_t 764237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 765237fead6SMichael Halcrow loff_t upper_size) 766237fead6SMichael Halcrow { 767237fead6SMichael Halcrow loff_t lower_size; 768237fead6SMichael Halcrow 769157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 770237fead6SMichael Halcrow if (upper_size != 0) { 771237fead6SMichael Halcrow loff_t num_extents; 772237fead6SMichael Halcrow 773237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 774237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 775237fead6SMichael Halcrow num_extents++; 776237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 777237fead6SMichael Halcrow } 778237fead6SMichael Halcrow return lower_size; 779237fead6SMichael Halcrow } 780237fead6SMichael Halcrow 781237fead6SMichael Halcrow /** 7825f3ef64fSTyler Hicks * truncate_upper 783237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7845f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7855f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 786237fead6SMichael Halcrow * 787237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 788237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7895f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7905f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7915f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7925f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7935f3ef64fSTyler Hicks * the truncation of the lower inode. 794237fead6SMichael Halcrow * 795237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 796237fead6SMichael Halcrow */ 7975f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7985f3ef64fSTyler Hicks struct iattr *lower_ia) 799237fead6SMichael Halcrow { 800237fead6SMichael Halcrow int rc = 0; 801237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 802237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 803237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 804237fead6SMichael Halcrow loff_t lower_size_before_truncate; 805237fead6SMichael Halcrow loff_t lower_size_after_truncate; 806237fead6SMichael Halcrow 8075f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 8085f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 809332ab16fSTyler Hicks return 0; 8105f3ef64fSTyler Hicks } 8113b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 812332ab16fSTyler Hicks if (rc) 813332ab16fSTyler Hicks return rc; 814237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 815237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 8165f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 8172ed92554SMichael Halcrow char zero[] = { 0x00 }; 818240e2df5SMichael Halcrow 8195f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 8202ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 8212ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 8222ed92554SMichael Halcrow * the intermediate portion of the previous end of the 8232ed92554SMichael Halcrow * file and the new and of the file */ 82448c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 8255f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 8265f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 8275f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 8285f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 8295f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8302ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8312ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8325f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8332ed92554SMichael Halcrow 8342c27c65eSChristoph Hellwig 8352c27c65eSChristoph Hellwig /* 8362c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 8372c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 8382c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 8392c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 8402c27c65eSChristoph Hellwig * ->setattr while would include this. 8412c27c65eSChristoph Hellwig */ 8422c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 84313a791b4STyler Hicks if (rc) 84448c1e44aSAl Viro goto out; 8452c27c65eSChristoph Hellwig 8462c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8472c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8485f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8495f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 85048c1e44aSAl Viro goto out; 85113a791b4STyler Hicks } 8522ed92554SMichael Halcrow if (num_zeros) { 8532ed92554SMichael Halcrow char *zeros_virt; 8542ed92554SMichael Halcrow 8552ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8562ed92554SMichael Halcrow if (!zeros_virt) { 8572ed92554SMichael Halcrow rc = -ENOMEM; 85848c1e44aSAl Viro goto out; 859240e2df5SMichael Halcrow } 86048c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8615f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8622ed92554SMichael Halcrow kfree(zeros_virt); 8635dda6992SMichael Halcrow if (rc) { 864240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 865240e2df5SMichael Halcrow "the remainder of the end page on " 866240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 86748c1e44aSAl Viro goto out; 868240e2df5SMichael Halcrow } 869240e2df5SMichael Halcrow } 8702c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8710216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 872dd2a3b7aSMichael Halcrow if (rc) { 873dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 874dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 875dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 87648c1e44aSAl Viro goto out; 877dd2a3b7aSMichael Halcrow } 878237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 879237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 880237fead6SMichael Halcrow lower_size_before_truncate = 881237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 882237fead6SMichael Halcrow lower_size_after_truncate = 8835f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8845f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8855f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8865f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8875f3ef64fSTyler Hicks } else 8885f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 889237fead6SMichael Halcrow } 890237fead6SMichael Halcrow out: 891332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 892237fead6SMichael Halcrow return rc; 893237fead6SMichael Halcrow } 894237fead6SMichael Halcrow 8955f3ef64fSTyler Hicks /** 8965f3ef64fSTyler Hicks * ecryptfs_truncate 8975f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8985f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8995f3ef64fSTyler Hicks * 9005f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 9015f3ef64fSTyler Hicks * its corresponding lower inode. 9025f3ef64fSTyler Hicks * 9035f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 9045f3ef64fSTyler Hicks */ 9055f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 9065f3ef64fSTyler Hicks { 9075f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 9085f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 9095f3ef64fSTyler Hicks int rc; 9105f3ef64fSTyler Hicks 9115f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 9125f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 9135f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 9145f3ef64fSTyler Hicks 9155f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 9165f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9175f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 9185f3ef64fSTyler Hicks } 9195f3ef64fSTyler Hicks return rc; 9205f3ef64fSTyler Hicks } 9215f3ef64fSTyler Hicks 922237fead6SMichael Halcrow static int 92310556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 924237fead6SMichael Halcrow { 925f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 926237fead6SMichael Halcrow } 927237fead6SMichael Halcrow 928237fead6SMichael Halcrow /** 929237fead6SMichael Halcrow * ecryptfs_setattr 930237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 931237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 932237fead6SMichael Halcrow * 933237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 934237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 935237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 936237fead6SMichael Halcrow * 937237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 938237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 939237fead6SMichael Halcrow */ 940237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 941237fead6SMichael Halcrow { 942237fead6SMichael Halcrow int rc = 0; 943237fead6SMichael Halcrow struct dentry *lower_dentry; 9445f3ef64fSTyler Hicks struct iattr lower_ia; 945237fead6SMichael Halcrow struct inode *inode; 946237fead6SMichael Halcrow struct inode *lower_inode; 947237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 948237fead6SMichael Halcrow 949237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 950e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 951e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 952237fead6SMichael Halcrow inode = dentry->d_inode; 953237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 954e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 955e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 956e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 957e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 95864ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 95964ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 96064ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 961e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 962e10f281bSMichael Halcrow 963e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 964e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9653b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 966332ab16fSTyler Hicks if (rc) { 967332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 968332ab16fSTyler Hicks goto out; 969332ab16fSTyler Hicks } 970d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 971332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9725dda6992SMichael Halcrow if (rc) { 973e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 974e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 975e10f281bSMichael Halcrow rc = -EIO; 97625bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 977e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 97825bd8174SMichael Halcrow "or the key could not be retrieved. " 97925bd8174SMichael Halcrow "Plaintext passthrough mode is not " 980e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 981e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 982e10f281bSMichael Halcrow goto out; 983e10f281bSMichael Halcrow } 984e10f281bSMichael Halcrow rc = 0; 9853aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9863aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 987e10f281bSMichael Halcrow } 988e10f281bSMichael Halcrow } 989e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 9905be79de2STyler Hicks if (S_ISREG(inode->i_mode)) { 9915be79de2STyler Hicks rc = filemap_write_and_wait(inode->i_mapping); 9925be79de2STyler Hicks if (rc) 9935be79de2STyler Hicks goto out; 9945be79de2STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 9955be79de2STyler Hicks } 9965f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9975f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9985f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 999237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 10005f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 1001237fead6SMichael Halcrow if (rc < 0) 1002237fead6SMichael Halcrow goto out; 1003237fead6SMichael Halcrow } 10041ac564ecSJeff Layton 10051ac564ecSJeff Layton /* 10061ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 10071ac564ecSJeff Layton * to interpret this in its own way. 10081ac564ecSJeff Layton */ 10095f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 10105f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 10111ac564ecSJeff Layton 10129c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 10135f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 10149c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 1015237fead6SMichael Halcrow out: 10169afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 1017237fead6SMichael Halcrow return rc; 1018237fead6SMichael Halcrow } 1019237fead6SMichael Halcrow 10203a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 10213a60a168STyler Hicks struct kstat *stat) 10223a60a168STyler Hicks { 10233a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 10243a60a168STyler Hicks int rc = 0; 10253a60a168STyler Hicks 10263a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 10273a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 10283a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 10293a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10303a60a168STyler Hicks char *target; 10313a60a168STyler Hicks size_t targetsiz; 10323a60a168STyler Hicks 10333a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 10343a60a168STyler Hicks if (!rc) { 10353a60a168STyler Hicks kfree(target); 10363a60a168STyler Hicks stat->size = targetsiz; 10373a60a168STyler Hicks } 10383a60a168STyler Hicks } 10393a60a168STyler Hicks return rc; 10403a60a168STyler Hicks } 10413a60a168STyler Hicks 1042f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1043f8f484d1STyler Hicks struct kstat *stat) 1044f8f484d1STyler Hicks { 1045f8f484d1STyler Hicks struct kstat lower_stat; 1046f8f484d1STyler Hicks int rc; 1047f8f484d1STyler Hicks 1048f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1049f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1050f8f484d1STyler Hicks if (!rc) { 105155f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 105255f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 1053f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1054f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1055f8f484d1STyler Hicks } 1056f8f484d1STyler Hicks return rc; 1057f8f484d1STyler Hicks } 1058f8f484d1STyler Hicks 1059dd2a3b7aSMichael Halcrow int 1060237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1061237fead6SMichael Halcrow size_t size, int flags) 1062237fead6SMichael Halcrow { 1063237fead6SMichael Halcrow int rc = 0; 1064237fead6SMichael Halcrow struct dentry *lower_dentry; 1065237fead6SMichael Halcrow 1066237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1067237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1068cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1069237fead6SMichael Halcrow goto out; 1070237fead6SMichael Halcrow } 107148b512e6SRoberto Sassu 107248b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1073237fead6SMichael Halcrow out: 1074237fead6SMichael Halcrow return rc; 1075237fead6SMichael Halcrow } 1076237fead6SMichael Halcrow 1077dd2a3b7aSMichael Halcrow ssize_t 1078d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1079d7cdc5feSMichael Halcrow void *value, size_t size) 1080d7cdc5feSMichael Halcrow { 1081d7cdc5feSMichael Halcrow int rc = 0; 1082d7cdc5feSMichael Halcrow 1083d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1084cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1085d7cdc5feSMichael Halcrow goto out; 1086d7cdc5feSMichael Halcrow } 1087d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1088d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1089d7cdc5feSMichael Halcrow size); 1090d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1091d7cdc5feSMichael Halcrow out: 1092d7cdc5feSMichael Halcrow return rc; 1093d7cdc5feSMichael Halcrow } 1094d7cdc5feSMichael Halcrow 10957896b631SAdrian Bunk static ssize_t 1096237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1097237fead6SMichael Halcrow size_t size) 1098237fead6SMichael Halcrow { 10992ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 11002ed92554SMichael Halcrow value, size); 1101237fead6SMichael Halcrow } 1102237fead6SMichael Halcrow 1103237fead6SMichael Halcrow static ssize_t 1104237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1105237fead6SMichael Halcrow { 1106237fead6SMichael Halcrow int rc = 0; 1107237fead6SMichael Halcrow struct dentry *lower_dentry; 1108237fead6SMichael Halcrow 1109237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1110237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1111cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1112237fead6SMichael Halcrow goto out; 1113237fead6SMichael Halcrow } 1114237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1115237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1116237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1117237fead6SMichael Halcrow out: 1118237fead6SMichael Halcrow return rc; 1119237fead6SMichael Halcrow } 1120237fead6SMichael Halcrow 1121237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1122237fead6SMichael Halcrow { 1123237fead6SMichael Halcrow int rc = 0; 1124237fead6SMichael Halcrow struct dentry *lower_dentry; 1125237fead6SMichael Halcrow 1126237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1127237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1128cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1129237fead6SMichael Halcrow goto out; 1130237fead6SMichael Halcrow } 1131237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1132237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1133237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1134237fead6SMichael Halcrow out: 1135237fead6SMichael Halcrow return rc; 1136237fead6SMichael Halcrow } 1137237fead6SMichael Halcrow 1138754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1139237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1140237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1141237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1142237fead6SMichael Halcrow .permission = ecryptfs_permission, 1143237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11443a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1145237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1146237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1147237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1148237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1149237fead6SMichael Halcrow }; 1150237fead6SMichael Halcrow 1151754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1152237fead6SMichael Halcrow .create = ecryptfs_create, 1153237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1154237fead6SMichael Halcrow .link = ecryptfs_link, 1155237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1156237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1157237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1158237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1159237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1160237fead6SMichael Halcrow .rename = ecryptfs_rename, 1161237fead6SMichael Halcrow .permission = ecryptfs_permission, 1162237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1163237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1164237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1165237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1166237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1167237fead6SMichael Halcrow }; 1168237fead6SMichael Halcrow 1169754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1170237fead6SMichael Halcrow .permission = ecryptfs_permission, 1171237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1172f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1173237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1174237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1175237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1176237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1177237fead6SMichael Halcrow }; 1178