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 * 175b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 176237fead6SMichael Halcrow */ 177b59db43aSTyler Hicks static struct inode * 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; 184b59db43aSTyler Hicks struct inode *inode; 185237fead6SMichael Halcrow 186237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 187237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 188801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 189237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 190237fead6SMichael Halcrow "dentry\n"); 191b59db43aSTyler Hicks inode = ERR_CAST(lower_dir_dentry); 192237fead6SMichael Halcrow goto out; 193237fead6SMichael Halcrow } 194237fead6SMichael Halcrow rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, 195bf6c7f6cSAl Viro ecryptfs_dentry, mode); 1964981e081SMichael Halcrow if (rc) { 197caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 19818d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 199b59db43aSTyler Hicks inode = ERR_PTR(rc); 200237fead6SMichael Halcrow goto out_lock; 201237fead6SMichael Halcrow } 202b59db43aSTyler Hicks inode = __ecryptfs_get_inode(lower_dentry->d_inode, 2035ccf9203STyler Hicks directory_inode->i_sb); 204b59db43aSTyler Hicks if (IS_ERR(inode)) 205237fead6SMichael Halcrow goto out_lock; 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: 211b59db43aSTyler Hicks return inode; 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 */ 222b59db43aSTyler Hicks static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 223b59db43aSTyler Hicks struct inode *ecryptfs_inode) 224237fead6SMichael Halcrow { 225d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 226b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 227237fead6SMichael Halcrow int rc = 0; 228237fead6SMichael Halcrow 229b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 230237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 231e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 232d7cdc5feSMichael Halcrow goto out; 233237fead6SMichael Halcrow } 234237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 235b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 236237fead6SMichael Halcrow if (rc) { 237d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 238d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 239d7cdc5feSMichael Halcrow goto out; 240237fead6SMichael Halcrow } 241b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_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 } 249b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 250332ab16fSTyler Hicks if (rc) 251d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 252b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_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 { 272b59db43aSTyler Hicks struct inode *ecryptfs_inode; 273237fead6SMichael Halcrow int rc; 274237fead6SMichael Halcrow 275b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 276b59db43aSTyler Hicks mode); 277b59db43aSTyler Hicks if (unlikely(IS_ERR(ecryptfs_inode))) { 278237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 279237fead6SMichael Halcrow "lower filesystem\n"); 280b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 281237fead6SMichael Halcrow goto out; 282237fead6SMichael Halcrow } 283237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 284237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 285b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 286b59db43aSTyler Hicks if (rc) { 287b59db43aSTyler Hicks drop_nlink(ecryptfs_inode); 288b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 289b59db43aSTyler Hicks iput(ecryptfs_inode); 290b59db43aSTyler Hicks goto out; 291b59db43aSTyler Hicks } 292b59db43aSTyler Hicks d_instantiate(ecryptfs_dentry, ecryptfs_inode); 293b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 294237fead6SMichael Halcrow out: 295237fead6SMichael Halcrow return rc; 296237fead6SMichael Halcrow } 297237fead6SMichael Halcrow 298778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 299237fead6SMichael Halcrow { 3002aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 301778aeb42STyler Hicks int rc; 302237fead6SMichael Halcrow 303778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 304391b52f9SMichael Halcrow if (rc) { 305391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 306332ab16fSTyler Hicks "the lower file for the dentry with name " 307391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 308778aeb42STyler Hicks dentry->d_name.name, rc); 309778aeb42STyler Hicks return rc; 310391b52f9SMichael Halcrow } 311778aeb42STyler Hicks 3123b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3132aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3142aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3152aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 316778aeb42STyler Hicks 317778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 318778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 319237fead6SMichael Halcrow if (rc) { 320778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 321778aeb42STyler Hicks if (!rc) 322dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 323dd2a3b7aSMichael Halcrow } 324778aeb42STyler Hicks 325778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 326778aeb42STyler Hicks return 0; 327778aeb42STyler Hicks } 328778aeb42STyler Hicks 329778aeb42STyler Hicks /** 330778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 331778aeb42STyler Hicks */ 332778aeb42STyler Hicks static int ecryptfs_lookup_interpose(struct dentry *dentry, 333778aeb42STyler Hicks struct dentry *lower_dentry, 334778aeb42STyler Hicks struct inode *dir_inode) 335778aeb42STyler Hicks { 336778aeb42STyler Hicks struct inode *inode, *lower_inode = lower_dentry->d_inode; 337778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 338778aeb42STyler Hicks struct vfsmount *lower_mnt; 339778aeb42STyler Hicks int rc = 0; 340778aeb42STyler Hicks 341778aeb42STyler Hicks lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 342778aeb42STyler Hicks fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); 343778aeb42STyler Hicks BUG_ON(!lower_dentry->d_count); 344778aeb42STyler Hicks 345778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 346778aeb42STyler Hicks ecryptfs_set_dentry_private(dentry, dentry_info); 347778aeb42STyler Hicks if (!dentry_info) { 348778aeb42STyler Hicks printk(KERN_ERR "%s: Out of memory whilst attempting " 349778aeb42STyler Hicks "to allocate ecryptfs_dentry_info struct\n", 350778aeb42STyler Hicks __func__); 351237fead6SMichael Halcrow dput(lower_dentry); 35231f73beeSLino Sanfilippo mntput(lower_mnt); 353778aeb42STyler Hicks d_drop(dentry); 354778aeb42STyler Hicks return -ENOMEM; 355778aeb42STyler Hicks } 356778aeb42STyler Hicks ecryptfs_set_dentry_lower(dentry, lower_dentry); 357778aeb42STyler Hicks ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); 358778aeb42STyler Hicks 359778aeb42STyler Hicks if (!lower_dentry->d_inode) { 360778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 361778aeb42STyler Hicks d_add(dentry, NULL); 362778aeb42STyler Hicks return 0; 363778aeb42STyler Hicks } 364778aeb42STyler Hicks inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); 365778aeb42STyler Hicks if (IS_ERR(inode)) { 366778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 367778aeb42STyler Hicks __func__, PTR_ERR(inode)); 368778aeb42STyler Hicks return PTR_ERR(inode); 369778aeb42STyler Hicks } 370778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 371778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 372778aeb42STyler Hicks if (rc) { 373778aeb42STyler Hicks make_bad_inode(inode); 374778aeb42STyler Hicks return rc; 375778aeb42STyler Hicks } 376778aeb42STyler Hicks } 377778aeb42STyler Hicks 378778aeb42STyler Hicks if (inode->i_state & I_NEW) 379778aeb42STyler Hicks unlock_new_inode(inode); 380778aeb42STyler Hicks d_add(dentry, inode); 381778aeb42STyler Hicks 382addd65adSMichael Halcrow return rc; 383addd65adSMichael Halcrow } 384addd65adSMichael Halcrow 385addd65adSMichael Halcrow /** 386addd65adSMichael Halcrow * ecryptfs_lookup 387addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 388addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 389addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 390addd65adSMichael Halcrow * 391addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 392addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 393addd65adSMichael Halcrow */ 394addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 395addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 396addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 397addd65adSMichael Halcrow { 398addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 399a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 400addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 401addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 402addd65adSMichael Halcrow int rc = 0; 403addd65adSMichael Halcrow 404addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 405addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 406addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 407addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 408addd65adSMichael Halcrow goto out_d_drop; 409addd65adSMichael Halcrow } 410addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 4118787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4128787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 4138787c7a3STyler Hicks lower_dir_dentry, 4148787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 4158787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 416addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 417addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4188787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4199f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 4209f37622fSTyler Hicks encrypted_and_encoded_name); 421addd65adSMichael Halcrow goto out_d_drop; 422addd65adSMichael Halcrow } 423addd65adSMichael Halcrow if (lower_dentry->d_inode) 4245ccf9203STyler Hicks goto interpose; 425addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 426addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4272aac0cf8STyler Hicks if (!(mount_crypt_stat 4282aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 4295ccf9203STyler Hicks goto interpose; 430addd65adSMichael Halcrow dput(lower_dentry); 431addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 432addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4332aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 434addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 435addd65adSMichael Halcrow if (rc) { 436addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 437addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 438addd65adSMichael Halcrow goto out_d_drop; 439addd65adSMichael Halcrow } 4408787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4418787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4428787c7a3STyler Hicks lower_dir_dentry, 4438787c7a3STyler Hicks encrypted_and_encoded_name_size); 4448787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 445addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 446addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4478787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4489f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 449addd65adSMichael Halcrow encrypted_and_encoded_name); 450addd65adSMichael Halcrow goto out_d_drop; 451addd65adSMichael Halcrow } 4525ccf9203STyler Hicks interpose: 4535ccf9203STyler Hicks rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, 45470b89021STyler Hicks ecryptfs_dir_inode); 455addd65adSMichael Halcrow goto out; 456addd65adSMichael Halcrow out_d_drop: 457addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 458addd65adSMichael Halcrow out: 459addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 460237fead6SMichael Halcrow return ERR_PTR(rc); 461237fead6SMichael Halcrow } 462237fead6SMichael Halcrow 463237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 464237fead6SMichael Halcrow struct dentry *new_dentry) 465237fead6SMichael Halcrow { 466237fead6SMichael Halcrow struct dentry *lower_old_dentry; 467237fead6SMichael Halcrow struct dentry *lower_new_dentry; 468237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 469237fead6SMichael Halcrow u64 file_size_save; 470237fead6SMichael Halcrow int rc; 471237fead6SMichael Halcrow 472237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 473237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 474237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 475237fead6SMichael Halcrow dget(lower_old_dentry); 476237fead6SMichael Halcrow dget(lower_new_dentry); 477237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 478237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 479237fead6SMichael Halcrow lower_new_dentry); 480237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 481237fead6SMichael Halcrow goto out_lock; 4825ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 483237fead6SMichael Halcrow if (rc) 484237fead6SMichael Halcrow goto out_lock; 4853a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4863a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 487bfe86848SMiklos Szeredi set_nlink(old_dentry->d_inode, 488bfe86848SMiklos Szeredi ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); 489237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 490237fead6SMichael Halcrow out_lock: 491237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 492237fead6SMichael Halcrow dput(lower_new_dentry); 493237fead6SMichael Halcrow dput(lower_old_dentry); 494237fead6SMichael Halcrow return rc; 495237fead6SMichael Halcrow } 496237fead6SMichael Halcrow 497237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 498237fead6SMichael Halcrow { 499237fead6SMichael Halcrow int rc = 0; 500237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 501237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 5028dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 503237fead6SMichael Halcrow 5049c2d2056STyler Hicks dget(lower_dentry); 5058dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 506237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 507237fead6SMichael Halcrow if (rc) { 508ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 509237fead6SMichael Halcrow goto out_unlock; 510237fead6SMichael Halcrow } 5110cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 512bfe86848SMiklos Szeredi set_nlink(dentry->d_inode, 513bfe86848SMiklos Szeredi ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink); 514237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 515caeeeecfSMichael Halcrow d_drop(dentry); 516237fead6SMichael Halcrow out_unlock: 5178dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 5189c2d2056STyler Hicks dput(lower_dentry); 519237fead6SMichael Halcrow return rc; 520237fead6SMichael Halcrow } 521237fead6SMichael Halcrow 522237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 523237fead6SMichael Halcrow const char *symname) 524237fead6SMichael Halcrow { 525237fead6SMichael Halcrow int rc; 526237fead6SMichael Halcrow struct dentry *lower_dentry; 527237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 528237fead6SMichael Halcrow char *encoded_symname; 529addd65adSMichael Halcrow size_t encoded_symlen; 530addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 531237fead6SMichael Halcrow 532237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 533237fead6SMichael Halcrow dget(lower_dentry); 534237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 535addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 536addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 537addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 538addd65adSMichael Halcrow &encoded_symlen, 539addd65adSMichael Halcrow NULL, 540addd65adSMichael Halcrow mount_crypt_stat, symname, 541addd65adSMichael Halcrow strlen(symname)); 542addd65adSMichael Halcrow if (rc) 543237fead6SMichael Halcrow goto out_lock; 544237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 545db2e747bSMiklos Szeredi encoded_symname); 546237fead6SMichael Halcrow kfree(encoded_symname); 547237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 548237fead6SMichael Halcrow goto out_lock; 5495ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 550237fead6SMichael Halcrow if (rc) 551237fead6SMichael Halcrow goto out_lock; 5520cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5530cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 554237fead6SMichael Halcrow out_lock: 555237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 556237fead6SMichael Halcrow dput(lower_dentry); 557237fead6SMichael Halcrow if (!dentry->d_inode) 558237fead6SMichael Halcrow d_drop(dentry); 559237fead6SMichael Halcrow return rc; 560237fead6SMichael Halcrow } 561237fead6SMichael Halcrow 562237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 563237fead6SMichael Halcrow { 564237fead6SMichael Halcrow int rc; 565237fead6SMichael Halcrow struct dentry *lower_dentry; 566237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 567237fead6SMichael Halcrow 568237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 569237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 570237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 571237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 572237fead6SMichael Halcrow goto out; 5735ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 574237fead6SMichael Halcrow if (rc) 575237fead6SMichael Halcrow goto out; 5760cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5770cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 578bfe86848SMiklos Szeredi set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); 579237fead6SMichael Halcrow out: 580237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 581237fead6SMichael Halcrow if (!dentry->d_inode) 582237fead6SMichael Halcrow d_drop(dentry); 583237fead6SMichael Halcrow return rc; 584237fead6SMichael Halcrow } 585237fead6SMichael Halcrow 586237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 587237fead6SMichael Halcrow { 588237fead6SMichael Halcrow struct dentry *lower_dentry; 589237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 59045ec4abaSMichael Halcrow int rc; 591237fead6SMichael Halcrow 592237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 59345ec4abaSMichael Halcrow dget(dentry); 594237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 59545ec4abaSMichael Halcrow dget(lower_dentry); 596237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 59745ec4abaSMichael Halcrow dput(lower_dentry); 59807850552STyler Hicks if (!rc && dentry->d_inode) 59907850552STyler Hicks clear_nlink(dentry->d_inode); 6000cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 601bfe86848SMiklos Szeredi set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); 602237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 603237fead6SMichael Halcrow if (!rc) 604237fead6SMichael Halcrow d_drop(dentry); 60545ec4abaSMichael Halcrow dput(dentry); 606237fead6SMichael Halcrow return rc; 607237fead6SMichael Halcrow } 608237fead6SMichael Halcrow 609237fead6SMichael Halcrow static int 610237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 611237fead6SMichael Halcrow { 612237fead6SMichael Halcrow int rc; 613237fead6SMichael Halcrow struct dentry *lower_dentry; 614237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 615237fead6SMichael Halcrow 616237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 617237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 618237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 619237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 620237fead6SMichael Halcrow goto out; 6215ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 622237fead6SMichael Halcrow if (rc) 623237fead6SMichael Halcrow goto out; 6240cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6250cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 626237fead6SMichael Halcrow out: 627237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 628237fead6SMichael Halcrow if (!dentry->d_inode) 629237fead6SMichael Halcrow d_drop(dentry); 630237fead6SMichael Halcrow return rc; 631237fead6SMichael Halcrow } 632237fead6SMichael Halcrow 633237fead6SMichael Halcrow static int 634237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 635237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 636237fead6SMichael Halcrow { 637237fead6SMichael Halcrow int rc; 638237fead6SMichael Halcrow struct dentry *lower_old_dentry; 639237fead6SMichael Halcrow struct dentry *lower_new_dentry; 640237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 641237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6420d132f73SErez Zadok struct dentry *trap = NULL; 643237fead6SMichael Halcrow 644237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 645237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 646237fead6SMichael Halcrow dget(lower_old_dentry); 647237fead6SMichael Halcrow dget(lower_new_dentry); 648237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 649237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6500d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6510d132f73SErez Zadok /* source should not be ancestor of target */ 6520d132f73SErez Zadok if (trap == lower_old_dentry) { 6530d132f73SErez Zadok rc = -EINVAL; 6540d132f73SErez Zadok goto out_lock; 6550d132f73SErez Zadok } 6560d132f73SErez Zadok /* target should not be ancestor of source */ 6570d132f73SErez Zadok if (trap == lower_new_dentry) { 6580d132f73SErez Zadok rc = -ENOTEMPTY; 6590d132f73SErez Zadok goto out_lock; 6600d132f73SErez Zadok } 661237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 662237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 663237fead6SMichael Halcrow if (rc) 664237fead6SMichael Halcrow goto out_lock; 6659afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 666237fead6SMichael Halcrow if (new_dir != old_dir) 6679afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 668237fead6SMichael Halcrow out_lock: 669237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 670dd55c898STyler Hicks dput(lower_new_dir_dentry); 671dd55c898STyler Hicks dput(lower_old_dir_dentry); 672237fead6SMichael Halcrow dput(lower_new_dentry); 673237fead6SMichael Halcrow dput(lower_old_dentry); 674237fead6SMichael Halcrow return rc; 675237fead6SMichael Halcrow } 676237fead6SMichael Halcrow 6773a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6783a60a168STyler Hicks size_t *bufsiz) 679237fead6SMichael Halcrow { 6803a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 681237fead6SMichael Halcrow char *lower_buf; 6823a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 683addd65adSMichael Halcrow mm_segment_t old_fs; 684addd65adSMichael Halcrow int rc; 685237fead6SMichael Halcrow 6863a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 6873a60a168STyler Hicks if (!lower_buf) { 688237fead6SMichael Halcrow rc = -ENOMEM; 689237fead6SMichael Halcrow goto out; 690237fead6SMichael Halcrow } 691237fead6SMichael Halcrow old_fs = get_fs(); 692237fead6SMichael Halcrow set_fs(get_ds()); 693237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 694237fead6SMichael Halcrow (char __user *)lower_buf, 6953a6b42caSTyler Hicks lower_bufsiz); 696237fead6SMichael Halcrow set_fs(old_fs); 6973a60a168STyler Hicks if (rc < 0) 6983a60a168STyler Hicks goto out; 6993a60a168STyler Hicks lower_bufsiz = rc; 7003a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 7013a60a168STyler Hicks lower_buf, lower_bufsiz); 7023a60a168STyler Hicks out: 703237fead6SMichael Halcrow kfree(lower_buf); 7043a60a168STyler Hicks return rc; 7053a60a168STyler Hicks } 7063a60a168STyler Hicks 7073a60a168STyler Hicks static int 7083a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 7093a60a168STyler Hicks { 7103a60a168STyler Hicks char *kbuf; 7113a60a168STyler Hicks size_t kbufsiz, copied; 7123a60a168STyler Hicks int rc; 7133a60a168STyler Hicks 7143a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 7153a60a168STyler Hicks if (rc) 7163a60a168STyler Hicks goto out; 7173a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 7183a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 7193a60a168STyler Hicks kfree(kbuf); 7203a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 7213a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 722237fead6SMichael Halcrow out: 723237fead6SMichael Halcrow return rc; 724237fead6SMichael Halcrow } 725237fead6SMichael Halcrow 726237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 727237fead6SMichael Halcrow { 728237fead6SMichael Halcrow char *buf; 729237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 730237fead6SMichael Halcrow mm_segment_t old_fs; 731237fead6SMichael Halcrow 732237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 733237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 734237fead6SMichael Halcrow if (!buf) { 735806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 736237fead6SMichael Halcrow goto out; 737237fead6SMichael Halcrow } 738237fead6SMichael Halcrow old_fs = get_fs(); 739237fead6SMichael Halcrow set_fs(get_ds()); 740237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 741237fead6SMichael Halcrow set_fs(old_fs); 742806892e9SOGAWA Hirofumi if (rc < 0) { 743237fead6SMichael Halcrow kfree(buf); 744806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 745806892e9SOGAWA Hirofumi } else 746806892e9SOGAWA Hirofumi buf[rc] = '\0'; 747237fead6SMichael Halcrow out: 748806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 749806892e9SOGAWA Hirofumi return NULL; 750237fead6SMichael Halcrow } 751237fead6SMichael Halcrow 752237fead6SMichael Halcrow static void 753237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 754237fead6SMichael Halcrow { 755806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 756806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 757237fead6SMichael Halcrow /* Free the char* */ 758806892e9SOGAWA Hirofumi kfree(buf); 759806892e9SOGAWA Hirofumi } 760237fead6SMichael Halcrow } 761237fead6SMichael Halcrow 762237fead6SMichael Halcrow /** 763237fead6SMichael Halcrow * upper_size_to_lower_size 764237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 765237fead6SMichael Halcrow * @upper_size: Size of the upper file 766237fead6SMichael Halcrow * 767cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 768237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 769237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 770237fead6SMichael Halcrow * 771237fead6SMichael Halcrow * Returns Calculated size of the lower file. 772237fead6SMichael Halcrow */ 773237fead6SMichael Halcrow static loff_t 774237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 775237fead6SMichael Halcrow loff_t upper_size) 776237fead6SMichael Halcrow { 777237fead6SMichael Halcrow loff_t lower_size; 778237fead6SMichael Halcrow 779157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 780237fead6SMichael Halcrow if (upper_size != 0) { 781237fead6SMichael Halcrow loff_t num_extents; 782237fead6SMichael Halcrow 783237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 784237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 785237fead6SMichael Halcrow num_extents++; 786237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 787237fead6SMichael Halcrow } 788237fead6SMichael Halcrow return lower_size; 789237fead6SMichael Halcrow } 790237fead6SMichael Halcrow 791237fead6SMichael Halcrow /** 7925f3ef64fSTyler Hicks * truncate_upper 793237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7945f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7955f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 796237fead6SMichael Halcrow * 797237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 798237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7995f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 8005f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 8015f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 8025f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 8035f3ef64fSTyler Hicks * the truncation of the lower inode. 804237fead6SMichael Halcrow * 805237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 806237fead6SMichael Halcrow */ 8075f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 8085f3ef64fSTyler Hicks struct iattr *lower_ia) 809237fead6SMichael Halcrow { 810237fead6SMichael Halcrow int rc = 0; 811237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 812237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 813237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 814237fead6SMichael Halcrow loff_t lower_size_before_truncate; 815237fead6SMichael Halcrow loff_t lower_size_after_truncate; 816237fead6SMichael Halcrow 8175f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 8185f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 819332ab16fSTyler Hicks return 0; 8205f3ef64fSTyler Hicks } 8213b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 822332ab16fSTyler Hicks if (rc) 823332ab16fSTyler Hicks return rc; 824237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 825237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 8265f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 8272ed92554SMichael Halcrow char zero[] = { 0x00 }; 828240e2df5SMichael Halcrow 8295f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 8302ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 8312ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 8322ed92554SMichael Halcrow * the intermediate portion of the previous end of the 8332ed92554SMichael Halcrow * file and the new and of the file */ 83448c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 8355f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 8365f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 8375f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 8385f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 8395f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8402ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8412ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8425f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8432ed92554SMichael Halcrow 8442c27c65eSChristoph Hellwig 8452c27c65eSChristoph Hellwig /* 8462c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 8472c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 8482c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 8492c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 8502c27c65eSChristoph Hellwig * ->setattr while would include this. 8512c27c65eSChristoph Hellwig */ 8522c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 85313a791b4STyler Hicks if (rc) 85448c1e44aSAl Viro goto out; 8552c27c65eSChristoph Hellwig 8562c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8572c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8585f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8595f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 86048c1e44aSAl Viro goto out; 86113a791b4STyler Hicks } 8622ed92554SMichael Halcrow if (num_zeros) { 8632ed92554SMichael Halcrow char *zeros_virt; 8642ed92554SMichael Halcrow 8652ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8662ed92554SMichael Halcrow if (!zeros_virt) { 8672ed92554SMichael Halcrow rc = -ENOMEM; 86848c1e44aSAl Viro goto out; 869240e2df5SMichael Halcrow } 87048c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8715f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8722ed92554SMichael Halcrow kfree(zeros_virt); 8735dda6992SMichael Halcrow if (rc) { 874240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 875240e2df5SMichael Halcrow "the remainder of the end page on " 876240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 87748c1e44aSAl Viro goto out; 878240e2df5SMichael Halcrow } 879240e2df5SMichael Halcrow } 8802c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8810216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 882dd2a3b7aSMichael Halcrow if (rc) { 883dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 884dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 885dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 88648c1e44aSAl Viro goto out; 887dd2a3b7aSMichael Halcrow } 888237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 889237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 890237fead6SMichael Halcrow lower_size_before_truncate = 891237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 892237fead6SMichael Halcrow lower_size_after_truncate = 8935f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8945f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8955f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8965f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8975f3ef64fSTyler Hicks } else 8985f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 899237fead6SMichael Halcrow } 900237fead6SMichael Halcrow out: 901332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 902237fead6SMichael Halcrow return rc; 903237fead6SMichael Halcrow } 904237fead6SMichael Halcrow 9055f3ef64fSTyler Hicks /** 9065f3ef64fSTyler Hicks * ecryptfs_truncate 9075f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 9085f3ef64fSTyler Hicks * @new_length: The length to expand the file to 9095f3ef64fSTyler Hicks * 9105f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 9115f3ef64fSTyler Hicks * its corresponding lower inode. 9125f3ef64fSTyler Hicks * 9135f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 9145f3ef64fSTyler Hicks */ 9155f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 9165f3ef64fSTyler Hicks { 9175f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 9185f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 9195f3ef64fSTyler Hicks int rc; 9205f3ef64fSTyler Hicks 9215f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 9225f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 9235f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 9245f3ef64fSTyler Hicks 9255f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 9265f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9275f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 9285f3ef64fSTyler Hicks } 9295f3ef64fSTyler Hicks return rc; 9305f3ef64fSTyler Hicks } 9315f3ef64fSTyler Hicks 932237fead6SMichael Halcrow static int 93310556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 934237fead6SMichael Halcrow { 935f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 936237fead6SMichael Halcrow } 937237fead6SMichael Halcrow 938237fead6SMichael Halcrow /** 939237fead6SMichael Halcrow * ecryptfs_setattr 940237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 941237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 942237fead6SMichael Halcrow * 943237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 944237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 945237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 946237fead6SMichael Halcrow * 947237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 948237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 949237fead6SMichael Halcrow */ 950237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 951237fead6SMichael Halcrow { 952237fead6SMichael Halcrow int rc = 0; 953237fead6SMichael Halcrow struct dentry *lower_dentry; 9545f3ef64fSTyler Hicks struct iattr lower_ia; 955237fead6SMichael Halcrow struct inode *inode; 956237fead6SMichael Halcrow struct inode *lower_inode; 957237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 958237fead6SMichael Halcrow 959237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 960e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 961e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 962237fead6SMichael Halcrow inode = dentry->d_inode; 963237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 964e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 965e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 966e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 967e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 96864ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 96964ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 97064ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 971e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 972e10f281bSMichael Halcrow 973e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 974e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9753b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 976332ab16fSTyler Hicks if (rc) { 977332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 978332ab16fSTyler Hicks goto out; 979332ab16fSTyler Hicks } 980d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 981332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9825dda6992SMichael Halcrow if (rc) { 983e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 984e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 985e10f281bSMichael Halcrow rc = -EIO; 98625bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 987e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 98825bd8174SMichael Halcrow "or the key could not be retrieved. " 98925bd8174SMichael Halcrow "Plaintext passthrough mode is not " 990e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 991e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 992e10f281bSMichael Halcrow goto out; 993e10f281bSMichael Halcrow } 994e10f281bSMichael Halcrow rc = 0; 9953aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9963aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 997e10f281bSMichael Halcrow } 998e10f281bSMichael Halcrow } 999e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 10005be79de2STyler Hicks if (S_ISREG(inode->i_mode)) { 10015be79de2STyler Hicks rc = filemap_write_and_wait(inode->i_mapping); 10025be79de2STyler Hicks if (rc) 10035be79de2STyler Hicks goto out; 10045be79de2STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 10055be79de2STyler Hicks } 10065f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 10075f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 10085f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 1009237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 10105f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 1011237fead6SMichael Halcrow if (rc < 0) 1012237fead6SMichael Halcrow goto out; 1013237fead6SMichael Halcrow } 10141ac564ecSJeff Layton 10151ac564ecSJeff Layton /* 10161ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 10171ac564ecSJeff Layton * to interpret this in its own way. 10181ac564ecSJeff Layton */ 10195f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 10205f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 10211ac564ecSJeff Layton 10229c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 10235f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 10249c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 1025237fead6SMichael Halcrow out: 10269afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 1027237fead6SMichael Halcrow return rc; 1028237fead6SMichael Halcrow } 1029237fead6SMichael Halcrow 10303a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 10313a60a168STyler Hicks struct kstat *stat) 10323a60a168STyler Hicks { 10333a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 10343a60a168STyler Hicks int rc = 0; 10353a60a168STyler Hicks 10363a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 10373a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 10383a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 10393a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10403a60a168STyler Hicks char *target; 10413a60a168STyler Hicks size_t targetsiz; 10423a60a168STyler Hicks 10433a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 10443a60a168STyler Hicks if (!rc) { 10453a60a168STyler Hicks kfree(target); 10463a60a168STyler Hicks stat->size = targetsiz; 10473a60a168STyler Hicks } 10483a60a168STyler Hicks } 10493a60a168STyler Hicks return rc; 10503a60a168STyler Hicks } 10513a60a168STyler Hicks 1052f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1053f8f484d1STyler Hicks struct kstat *stat) 1054f8f484d1STyler Hicks { 1055f8f484d1STyler Hicks struct kstat lower_stat; 1056f8f484d1STyler Hicks int rc; 1057f8f484d1STyler Hicks 1058f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1059f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1060f8f484d1STyler Hicks if (!rc) { 106155f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 106255f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 1063f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1064f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1065f8f484d1STyler Hicks } 1066f8f484d1STyler Hicks return rc; 1067f8f484d1STyler Hicks } 1068f8f484d1STyler Hicks 1069dd2a3b7aSMichael Halcrow int 1070237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1071237fead6SMichael Halcrow size_t size, int flags) 1072237fead6SMichael Halcrow { 1073237fead6SMichael Halcrow int rc = 0; 1074237fead6SMichael Halcrow struct dentry *lower_dentry; 1075237fead6SMichael Halcrow 1076237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1077237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1078cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1079237fead6SMichael Halcrow goto out; 1080237fead6SMichael Halcrow } 108148b512e6SRoberto Sassu 108248b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1083237fead6SMichael Halcrow out: 1084237fead6SMichael Halcrow return rc; 1085237fead6SMichael Halcrow } 1086237fead6SMichael Halcrow 1087dd2a3b7aSMichael Halcrow ssize_t 1088d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1089d7cdc5feSMichael Halcrow void *value, size_t size) 1090d7cdc5feSMichael Halcrow { 1091d7cdc5feSMichael Halcrow int rc = 0; 1092d7cdc5feSMichael Halcrow 1093d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1094cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1095d7cdc5feSMichael Halcrow goto out; 1096d7cdc5feSMichael Halcrow } 1097d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1098d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1099d7cdc5feSMichael Halcrow size); 1100d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1101d7cdc5feSMichael Halcrow out: 1102d7cdc5feSMichael Halcrow return rc; 1103d7cdc5feSMichael Halcrow } 1104d7cdc5feSMichael Halcrow 11057896b631SAdrian Bunk static ssize_t 1106237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1107237fead6SMichael Halcrow size_t size) 1108237fead6SMichael Halcrow { 11092ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 11102ed92554SMichael Halcrow value, size); 1111237fead6SMichael Halcrow } 1112237fead6SMichael Halcrow 1113237fead6SMichael Halcrow static ssize_t 1114237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1115237fead6SMichael Halcrow { 1116237fead6SMichael Halcrow int rc = 0; 1117237fead6SMichael Halcrow struct dentry *lower_dentry; 1118237fead6SMichael Halcrow 1119237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1120237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1121cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1122237fead6SMichael Halcrow goto out; 1123237fead6SMichael Halcrow } 1124237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1125237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1126237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1127237fead6SMichael Halcrow out: 1128237fead6SMichael Halcrow return rc; 1129237fead6SMichael Halcrow } 1130237fead6SMichael Halcrow 1131237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1132237fead6SMichael Halcrow { 1133237fead6SMichael Halcrow int rc = 0; 1134237fead6SMichael Halcrow struct dentry *lower_dentry; 1135237fead6SMichael Halcrow 1136237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1137237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1138cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1139237fead6SMichael Halcrow goto out; 1140237fead6SMichael Halcrow } 1141237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1142237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1143237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1144237fead6SMichael Halcrow out: 1145237fead6SMichael Halcrow return rc; 1146237fead6SMichael Halcrow } 1147237fead6SMichael Halcrow 1148754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1149237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1150237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1151237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1152237fead6SMichael Halcrow .permission = ecryptfs_permission, 1153237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11543a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1155237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1156237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1157237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1158237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1159237fead6SMichael Halcrow }; 1160237fead6SMichael Halcrow 1161754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1162237fead6SMichael Halcrow .create = ecryptfs_create, 1163237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1164237fead6SMichael Halcrow .link = ecryptfs_link, 1165237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1166237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1167237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1168237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1169237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1170237fead6SMichael Halcrow .rename = ecryptfs_rename, 1171237fead6SMichael Halcrow .permission = ecryptfs_permission, 1172237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1173237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1174237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1175237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1176237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1177237fead6SMichael Halcrow }; 1178237fead6SMichael Halcrow 1179754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1180237fead6SMichael Halcrow .permission = ecryptfs_permission, 1181237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1182f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1183237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1184237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1185237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1186237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1187237fead6SMichael Halcrow }; 1188