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 1468bc2d3cfSTyler Hicks static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, 1478bc2d3cfSTyler Hicks struct inode *inode) 1488bc2d3cfSTyler Hicks { 1498bc2d3cfSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 1508bc2d3cfSTyler Hicks struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 1518bc2d3cfSTyler Hicks struct dentry *lower_dir_dentry; 1528bc2d3cfSTyler Hicks int rc; 1538bc2d3cfSTyler Hicks 1548bc2d3cfSTyler Hicks dget(lower_dentry); 1558bc2d3cfSTyler Hicks lower_dir_dentry = lock_parent(lower_dentry); 1568bc2d3cfSTyler Hicks rc = vfs_unlink(lower_dir_inode, lower_dentry); 1578bc2d3cfSTyler Hicks if (rc) { 1588bc2d3cfSTyler Hicks printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 1598bc2d3cfSTyler Hicks goto out_unlock; 1608bc2d3cfSTyler Hicks } 1618bc2d3cfSTyler Hicks fsstack_copy_attr_times(dir, lower_dir_inode); 1628bc2d3cfSTyler Hicks set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); 1638bc2d3cfSTyler Hicks inode->i_ctime = dir->i_ctime; 1648bc2d3cfSTyler Hicks d_drop(dentry); 1658bc2d3cfSTyler Hicks out_unlock: 1668bc2d3cfSTyler Hicks unlock_dir(lower_dir_dentry); 1678bc2d3cfSTyler Hicks dput(lower_dentry); 1688bc2d3cfSTyler Hicks return rc; 1698bc2d3cfSTyler Hicks } 1708bc2d3cfSTyler Hicks 171237fead6SMichael Halcrow /** 172237fead6SMichael Halcrow * ecryptfs_do_create 173237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 174237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 175237fead6SMichael Halcrow * @mode: The mode of the new file 176237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 177237fead6SMichael Halcrow * 178237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 179237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 180237fead6SMichael Halcrow * stat of the lower directory inode. 181237fead6SMichael Halcrow * 182b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 183237fead6SMichael Halcrow */ 184b59db43aSTyler Hicks static struct inode * 185237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 186175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 187237fead6SMichael Halcrow { 188237fead6SMichael Halcrow int rc; 189237fead6SMichael Halcrow struct dentry *lower_dentry; 190237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 191b59db43aSTyler Hicks struct inode *inode; 192237fead6SMichael Halcrow 193237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 194237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 195801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 196237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 197237fead6SMichael Halcrow "dentry\n"); 198b59db43aSTyler Hicks inode = ERR_CAST(lower_dir_dentry); 199237fead6SMichael Halcrow goto out; 200237fead6SMichael Halcrow } 20118cb1b08SAl Viro rc = vfs_create(lower_dir_dentry->d_inode, lower_dentry, mode, NULL); 2024981e081SMichael Halcrow if (rc) { 203caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 20418d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 205b59db43aSTyler Hicks inode = ERR_PTR(rc); 206237fead6SMichael Halcrow goto out_lock; 207237fead6SMichael Halcrow } 208b59db43aSTyler Hicks inode = __ecryptfs_get_inode(lower_dentry->d_inode, 2095ccf9203STyler Hicks directory_inode->i_sb); 2108bc2d3cfSTyler Hicks if (IS_ERR(inode)) { 2118bc2d3cfSTyler Hicks vfs_unlink(lower_dir_dentry->d_inode, lower_dentry); 212237fead6SMichael Halcrow goto out_lock; 2138bc2d3cfSTyler Hicks } 2140cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 2150cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 216237fead6SMichael Halcrow out_lock: 217237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 218237fead6SMichael Halcrow out: 219b59db43aSTyler Hicks return inode; 220237fead6SMichael Halcrow } 221237fead6SMichael Halcrow 222237fead6SMichael Halcrow /** 223237fead6SMichael Halcrow * ecryptfs_initialize_file 224237fead6SMichael Halcrow * 225237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 226237fead6SMichael Halcrow * file with a header and first data page. 227237fead6SMichael Halcrow * 228237fead6SMichael Halcrow * Returns zero on success 229237fead6SMichael Halcrow */ 230b59db43aSTyler Hicks static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 231b59db43aSTyler Hicks struct inode *ecryptfs_inode) 232237fead6SMichael Halcrow { 233d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 234b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 235237fead6SMichael Halcrow int rc = 0; 236237fead6SMichael Halcrow 237b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 238237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 239e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 240d7cdc5feSMichael Halcrow goto out; 241237fead6SMichael Halcrow } 242237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 243b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 244237fead6SMichael Halcrow if (rc) { 245d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 246d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 247d7cdc5feSMichael Halcrow goto out; 248237fead6SMichael Halcrow } 249b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 250391b52f9SMichael Halcrow if (rc) { 251391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 252332ab16fSTyler Hicks "the lower file for the dentry with name " 253391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 254391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 255391b52f9SMichael Halcrow goto out; 256391b52f9SMichael Halcrow } 257b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 258332ab16fSTyler Hicks if (rc) 259d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 260b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 261237fead6SMichael Halcrow out: 262237fead6SMichael Halcrow return rc; 263237fead6SMichael Halcrow } 264237fead6SMichael Halcrow 265237fead6SMichael Halcrow /** 266237fead6SMichael Halcrow * ecryptfs_create 267237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 268237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 269237fead6SMichael Halcrow * @mode: The mode of the new file. 270237fead6SMichael Halcrow * @nd: nameidata 271237fead6SMichael Halcrow * 272237fead6SMichael Halcrow * Creates a new file. 273237fead6SMichael Halcrow * 274237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 275237fead6SMichael Halcrow */ 276237fead6SMichael Halcrow static int 277237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 2784acdaf27SAl Viro umode_t mode, struct nameidata *nd) 279237fead6SMichael Halcrow { 280b59db43aSTyler Hicks struct inode *ecryptfs_inode; 281237fead6SMichael Halcrow int rc; 282237fead6SMichael Halcrow 283b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 284b59db43aSTyler Hicks mode); 285b59db43aSTyler Hicks if (unlikely(IS_ERR(ecryptfs_inode))) { 286237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 287237fead6SMichael Halcrow "lower filesystem\n"); 288b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 289237fead6SMichael Halcrow goto out; 290237fead6SMichael Halcrow } 291237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 292237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 293b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 294b59db43aSTyler Hicks if (rc) { 2958bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2968bc2d3cfSTyler Hicks ecryptfs_inode); 2978bc2d3cfSTyler Hicks make_bad_inode(ecryptfs_inode); 298b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 299b59db43aSTyler Hicks iput(ecryptfs_inode); 300b59db43aSTyler Hicks goto out; 301b59db43aSTyler Hicks } 302b59db43aSTyler Hicks d_instantiate(ecryptfs_dentry, ecryptfs_inode); 303b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 304237fead6SMichael Halcrow out: 305237fead6SMichael Halcrow return rc; 306237fead6SMichael Halcrow } 307237fead6SMichael Halcrow 308778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 309237fead6SMichael Halcrow { 3102aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 311778aeb42STyler Hicks int rc; 312237fead6SMichael Halcrow 313778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 314391b52f9SMichael Halcrow if (rc) { 315391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 316332ab16fSTyler Hicks "the lower file for the dentry with name " 317391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 318778aeb42STyler Hicks dentry->d_name.name, rc); 319778aeb42STyler Hicks return rc; 320391b52f9SMichael Halcrow } 321778aeb42STyler Hicks 3223b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3232aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3242aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3252aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 326778aeb42STyler Hicks 327778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 328778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 329237fead6SMichael Halcrow if (rc) { 330778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 331778aeb42STyler Hicks if (!rc) 332dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 333dd2a3b7aSMichael Halcrow } 334778aeb42STyler Hicks 335778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 336778aeb42STyler Hicks return 0; 337778aeb42STyler Hicks } 338778aeb42STyler Hicks 339778aeb42STyler Hicks /** 340778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 341778aeb42STyler Hicks */ 342778aeb42STyler Hicks static int ecryptfs_lookup_interpose(struct dentry *dentry, 343778aeb42STyler Hicks struct dentry *lower_dentry, 344778aeb42STyler Hicks struct inode *dir_inode) 345778aeb42STyler Hicks { 346778aeb42STyler Hicks struct inode *inode, *lower_inode = lower_dentry->d_inode; 347778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 348778aeb42STyler Hicks struct vfsmount *lower_mnt; 349778aeb42STyler Hicks int rc = 0; 350778aeb42STyler Hicks 351778aeb42STyler Hicks lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 352778aeb42STyler Hicks fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); 353778aeb42STyler Hicks BUG_ON(!lower_dentry->d_count); 354778aeb42STyler Hicks 355778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 356778aeb42STyler Hicks ecryptfs_set_dentry_private(dentry, dentry_info); 357778aeb42STyler Hicks if (!dentry_info) { 358778aeb42STyler Hicks printk(KERN_ERR "%s: Out of memory whilst attempting " 359778aeb42STyler Hicks "to allocate ecryptfs_dentry_info struct\n", 360778aeb42STyler Hicks __func__); 361237fead6SMichael Halcrow dput(lower_dentry); 36231f73beeSLino Sanfilippo mntput(lower_mnt); 363778aeb42STyler Hicks d_drop(dentry); 364778aeb42STyler Hicks return -ENOMEM; 365778aeb42STyler Hicks } 366778aeb42STyler Hicks ecryptfs_set_dentry_lower(dentry, lower_dentry); 367778aeb42STyler Hicks ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); 368778aeb42STyler Hicks 369778aeb42STyler Hicks if (!lower_dentry->d_inode) { 370778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 371778aeb42STyler Hicks d_add(dentry, NULL); 372778aeb42STyler Hicks return 0; 373778aeb42STyler Hicks } 374778aeb42STyler Hicks inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); 375778aeb42STyler Hicks if (IS_ERR(inode)) { 376778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 377778aeb42STyler Hicks __func__, PTR_ERR(inode)); 378778aeb42STyler Hicks return PTR_ERR(inode); 379778aeb42STyler Hicks } 380778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 381778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 382778aeb42STyler Hicks if (rc) { 383778aeb42STyler Hicks make_bad_inode(inode); 384778aeb42STyler Hicks return rc; 385778aeb42STyler Hicks } 386778aeb42STyler Hicks } 387778aeb42STyler Hicks 388778aeb42STyler Hicks if (inode->i_state & I_NEW) 389778aeb42STyler Hicks unlock_new_inode(inode); 390778aeb42STyler Hicks d_add(dentry, inode); 391778aeb42STyler Hicks 392addd65adSMichael Halcrow return rc; 393addd65adSMichael Halcrow } 394addd65adSMichael Halcrow 395addd65adSMichael Halcrow /** 396addd65adSMichael Halcrow * ecryptfs_lookup 397addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 398addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 399addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 400addd65adSMichael Halcrow * 401addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 402addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 403addd65adSMichael Halcrow */ 404addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 405addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 406addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 407addd65adSMichael Halcrow { 408addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 409a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 410addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 411addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 412addd65adSMichael Halcrow int rc = 0; 413addd65adSMichael Halcrow 414addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 415addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 416addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 417addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 418addd65adSMichael Halcrow goto out_d_drop; 419addd65adSMichael Halcrow } 420addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 4218787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4228787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 4238787c7a3STyler Hicks lower_dir_dentry, 4248787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 4258787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 426addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 427addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4288787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4299f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 4309f37622fSTyler Hicks encrypted_and_encoded_name); 431addd65adSMichael Halcrow goto out_d_drop; 432addd65adSMichael Halcrow } 433addd65adSMichael Halcrow if (lower_dentry->d_inode) 4345ccf9203STyler Hicks goto interpose; 435addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 436addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4372aac0cf8STyler Hicks if (!(mount_crypt_stat 4382aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 4395ccf9203STyler Hicks goto interpose; 440addd65adSMichael Halcrow dput(lower_dentry); 441addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 442addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4432aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 444addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 445addd65adSMichael Halcrow if (rc) { 446addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 447addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 448addd65adSMichael Halcrow goto out_d_drop; 449addd65adSMichael Halcrow } 4508787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4518787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4528787c7a3STyler Hicks lower_dir_dentry, 4538787c7a3STyler Hicks encrypted_and_encoded_name_size); 4548787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 455addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 456addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4578787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4589f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 459addd65adSMichael Halcrow encrypted_and_encoded_name); 460addd65adSMichael Halcrow goto out_d_drop; 461addd65adSMichael Halcrow } 4625ccf9203STyler Hicks interpose: 4635ccf9203STyler Hicks rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, 46470b89021STyler Hicks ecryptfs_dir_inode); 465addd65adSMichael Halcrow goto out; 466addd65adSMichael Halcrow out_d_drop: 467addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 468addd65adSMichael Halcrow out: 469addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 470237fead6SMichael Halcrow return ERR_PTR(rc); 471237fead6SMichael Halcrow } 472237fead6SMichael Halcrow 473237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 474237fead6SMichael Halcrow struct dentry *new_dentry) 475237fead6SMichael Halcrow { 476237fead6SMichael Halcrow struct dentry *lower_old_dentry; 477237fead6SMichael Halcrow struct dentry *lower_new_dentry; 478237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 479237fead6SMichael Halcrow u64 file_size_save; 480237fead6SMichael Halcrow int rc; 481237fead6SMichael Halcrow 482237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 483237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 484237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 485237fead6SMichael Halcrow dget(lower_old_dentry); 486237fead6SMichael Halcrow dget(lower_new_dentry); 487237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 488237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 489237fead6SMichael Halcrow lower_new_dentry); 490237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 491237fead6SMichael Halcrow goto out_lock; 4925ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 493237fead6SMichael Halcrow if (rc) 494237fead6SMichael Halcrow goto out_lock; 4953a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4963a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 497bfe86848SMiklos Szeredi set_nlink(old_dentry->d_inode, 498bfe86848SMiklos Szeredi ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); 499237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 500237fead6SMichael Halcrow out_lock: 501237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 502237fead6SMichael Halcrow dput(lower_new_dentry); 503237fead6SMichael Halcrow dput(lower_old_dentry); 504237fead6SMichael Halcrow return rc; 505237fead6SMichael Halcrow } 506237fead6SMichael Halcrow 507237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 508237fead6SMichael Halcrow { 5098bc2d3cfSTyler Hicks return ecryptfs_do_unlink(dir, dentry, dentry->d_inode); 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 55218bb1db3SAl Viro static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t 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 6001a67aafbSAl Viro ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t 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; 672addd65adSMichael Halcrow mm_segment_t old_fs; 673addd65adSMichael Halcrow int rc; 674237fead6SMichael Halcrow 675408bd629SAl Viro lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); 6763a60a168STyler Hicks if (!lower_buf) { 677237fead6SMichael Halcrow rc = -ENOMEM; 678237fead6SMichael Halcrow goto out; 679237fead6SMichael Halcrow } 680237fead6SMichael Halcrow old_fs = get_fs(); 681237fead6SMichael Halcrow set_fs(get_ds()); 682237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 683237fead6SMichael Halcrow (char __user *)lower_buf, 684408bd629SAl Viro PATH_MAX); 685237fead6SMichael Halcrow set_fs(old_fs); 6863a60a168STyler Hicks if (rc < 0) 6873a60a168STyler Hicks goto out; 6883a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 689408bd629SAl Viro lower_buf, rc); 6903a60a168STyler Hicks out: 691237fead6SMichael Halcrow kfree(lower_buf); 6923a60a168STyler Hicks return rc; 6933a60a168STyler Hicks } 6943a60a168STyler Hicks 695237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 696237fead6SMichael Halcrow { 697237fead6SMichael Halcrow char *buf; 698408bd629SAl Viro size_t len = PATH_MAX; 699408bd629SAl Viro int rc; 700237fead6SMichael Halcrow 701408bd629SAl Viro rc = ecryptfs_readlink_lower(dentry, &buf, &len); 702408bd629SAl Viro if (rc) 703237fead6SMichael Halcrow goto out; 704408bd629SAl Viro fsstack_copy_attr_atime(dentry->d_inode, 705408bd629SAl Viro ecryptfs_dentry_to_lower(dentry)->d_inode); 706408bd629SAl Viro buf[len] = '\0'; 707237fead6SMichael Halcrow out: 708806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 709806892e9SOGAWA Hirofumi return NULL; 710237fead6SMichael Halcrow } 711237fead6SMichael Halcrow 712237fead6SMichael Halcrow static void 713237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 714237fead6SMichael Halcrow { 715806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 716806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 717237fead6SMichael Halcrow /* Free the char* */ 718806892e9SOGAWA Hirofumi kfree(buf); 719806892e9SOGAWA Hirofumi } 720237fead6SMichael Halcrow } 721237fead6SMichael Halcrow 722237fead6SMichael Halcrow /** 723237fead6SMichael Halcrow * upper_size_to_lower_size 724237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 725237fead6SMichael Halcrow * @upper_size: Size of the upper file 726237fead6SMichael Halcrow * 727cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 728237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 729237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 730237fead6SMichael Halcrow * 731237fead6SMichael Halcrow * Returns Calculated size of the lower file. 732237fead6SMichael Halcrow */ 733237fead6SMichael Halcrow static loff_t 734237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 735237fead6SMichael Halcrow loff_t upper_size) 736237fead6SMichael Halcrow { 737237fead6SMichael Halcrow loff_t lower_size; 738237fead6SMichael Halcrow 739157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 740237fead6SMichael Halcrow if (upper_size != 0) { 741237fead6SMichael Halcrow loff_t num_extents; 742237fead6SMichael Halcrow 743237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 744237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 745237fead6SMichael Halcrow num_extents++; 746237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 747237fead6SMichael Halcrow } 748237fead6SMichael Halcrow return lower_size; 749237fead6SMichael Halcrow } 750237fead6SMichael Halcrow 751237fead6SMichael Halcrow /** 7525f3ef64fSTyler Hicks * truncate_upper 753237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7545f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7555f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 756237fead6SMichael Halcrow * 757237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 758237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7595f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7605f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7615f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7625f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7635f3ef64fSTyler Hicks * the truncation of the lower inode. 764237fead6SMichael Halcrow * 765237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 766237fead6SMichael Halcrow */ 7675f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7685f3ef64fSTyler Hicks struct iattr *lower_ia) 769237fead6SMichael Halcrow { 770237fead6SMichael Halcrow int rc = 0; 771237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 772237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 773237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 774237fead6SMichael Halcrow loff_t lower_size_before_truncate; 775237fead6SMichael Halcrow loff_t lower_size_after_truncate; 776237fead6SMichael Halcrow 7775f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7785f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 779332ab16fSTyler Hicks return 0; 7805f3ef64fSTyler Hicks } 7813b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 782332ab16fSTyler Hicks if (rc) 783332ab16fSTyler Hicks return rc; 784237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 785237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7865f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7872ed92554SMichael Halcrow char zero[] = { 0x00 }; 788240e2df5SMichael Halcrow 7895f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7902ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7912ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7922ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7932ed92554SMichael Halcrow * file and the new and of the file */ 79448c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7955f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7965f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7975f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7985f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 7995f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8002ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8012ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8025f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8032ed92554SMichael Halcrow 8042c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8052c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8065f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8075f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 80848c1e44aSAl Viro goto out; 80913a791b4STyler Hicks } 8102ed92554SMichael Halcrow if (num_zeros) { 8112ed92554SMichael Halcrow char *zeros_virt; 8122ed92554SMichael Halcrow 8132ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8142ed92554SMichael Halcrow if (!zeros_virt) { 8152ed92554SMichael Halcrow rc = -ENOMEM; 81648c1e44aSAl Viro goto out; 817240e2df5SMichael Halcrow } 81848c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8195f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8202ed92554SMichael Halcrow kfree(zeros_virt); 8215dda6992SMichael Halcrow if (rc) { 822240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 823240e2df5SMichael Halcrow "the remainder of the end page on " 824240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 82548c1e44aSAl Viro goto out; 826240e2df5SMichael Halcrow } 827240e2df5SMichael Halcrow } 8282c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8290216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 830dd2a3b7aSMichael Halcrow if (rc) { 831dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 832dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 833dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 83448c1e44aSAl Viro goto out; 835dd2a3b7aSMichael Halcrow } 836237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 837237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 838237fead6SMichael Halcrow lower_size_before_truncate = 839237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 840237fead6SMichael Halcrow lower_size_after_truncate = 8415f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8425f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8435f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8445f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8455f3ef64fSTyler Hicks } else 8465f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 847237fead6SMichael Halcrow } 848237fead6SMichael Halcrow out: 849332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 850237fead6SMichael Halcrow return rc; 851237fead6SMichael Halcrow } 852237fead6SMichael Halcrow 853a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 854a261a039STyler Hicks { 855a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 856a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 857a261a039STyler Hicks 858a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 859a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 860a261a039STyler Hicks i_size_read(inode)); 861a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 862a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 863a261a039STyler Hicks /* 864a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 865a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 866a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 867a261a039STyler Hicks * from other filesystems. 868a261a039STyler Hicks */ 869a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 870a261a039STyler Hicks } 871a261a039STyler Hicks 872a261a039STyler Hicks return 0; 873a261a039STyler Hicks } 874a261a039STyler Hicks 8755f3ef64fSTyler Hicks /** 8765f3ef64fSTyler Hicks * ecryptfs_truncate 8775f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8785f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8795f3ef64fSTyler Hicks * 8805f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8815f3ef64fSTyler Hicks * its corresponding lower inode. 8825f3ef64fSTyler Hicks * 8835f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8845f3ef64fSTyler Hicks */ 8855f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8865f3ef64fSTyler Hicks { 8875f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8885f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8895f3ef64fSTyler Hicks int rc; 8905f3ef64fSTyler Hicks 891a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length); 892a261a039STyler Hicks if (rc) 893a261a039STyler Hicks return rc; 894a261a039STyler Hicks 8955f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8965f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8975f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8985f3ef64fSTyler Hicks 8995f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 9005f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9015f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 9025f3ef64fSTyler Hicks } 9035f3ef64fSTyler Hicks return rc; 9045f3ef64fSTyler Hicks } 9055f3ef64fSTyler Hicks 906237fead6SMichael Halcrow static int 90710556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 908237fead6SMichael Halcrow { 909f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 910237fead6SMichael Halcrow } 911237fead6SMichael Halcrow 912237fead6SMichael Halcrow /** 913237fead6SMichael Halcrow * ecryptfs_setattr 914237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 915237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 916237fead6SMichael Halcrow * 917237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 918237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 919237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 920237fead6SMichael Halcrow * 921237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 922237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 923237fead6SMichael Halcrow */ 924237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 925237fead6SMichael Halcrow { 926237fead6SMichael Halcrow int rc = 0; 927237fead6SMichael Halcrow struct dentry *lower_dentry; 9285f3ef64fSTyler Hicks struct iattr lower_ia; 929237fead6SMichael Halcrow struct inode *inode; 930237fead6SMichael Halcrow struct inode *lower_inode; 931237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 932237fead6SMichael Halcrow 933237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 934e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 935e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 936237fead6SMichael Halcrow inode = dentry->d_inode; 937237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 938e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 939e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 940e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 941e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 94264ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 94364ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 94464ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 945e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 946e10f281bSMichael Halcrow 947e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 948e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9493b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 950332ab16fSTyler Hicks if (rc) { 951332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 952332ab16fSTyler Hicks goto out; 953332ab16fSTyler Hicks } 954d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 955332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9565dda6992SMichael Halcrow if (rc) { 957e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 958e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 959e10f281bSMichael Halcrow rc = -EIO; 96025bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 961e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 96225bd8174SMichael Halcrow "or the key could not be retrieved. " 96325bd8174SMichael Halcrow "Plaintext passthrough mode is not " 964e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 965e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 966e10f281bSMichael Halcrow goto out; 967e10f281bSMichael Halcrow } 968e10f281bSMichael Halcrow rc = 0; 9693aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9703aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 971e10f281bSMichael Halcrow } 972e10f281bSMichael Halcrow } 973e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 974a261a039STyler Hicks 975a261a039STyler Hicks rc = inode_change_ok(inode, ia); 976a261a039STyler Hicks if (rc) 977a261a039STyler Hicks goto out; 978a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 979a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 980a261a039STyler Hicks if (rc) 981a261a039STyler Hicks goto out; 982a261a039STyler Hicks } 983a261a039STyler Hicks 9845be79de2STyler Hicks if (S_ISREG(inode->i_mode)) { 9855be79de2STyler Hicks rc = filemap_write_and_wait(inode->i_mapping); 9865be79de2STyler Hicks if (rc) 9875be79de2STyler Hicks goto out; 9885be79de2STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 9895be79de2STyler Hicks } 9905f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9915f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9925f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 993237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9945f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 995237fead6SMichael Halcrow if (rc < 0) 996237fead6SMichael Halcrow goto out; 997237fead6SMichael Halcrow } 9981ac564ecSJeff Layton 9991ac564ecSJeff Layton /* 10001ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 10011ac564ecSJeff Layton * to interpret this in its own way. 10021ac564ecSJeff Layton */ 10035f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 10045f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 10051ac564ecSJeff Layton 10069c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 10075f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 10089c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 1009237fead6SMichael Halcrow out: 10109afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 1011237fead6SMichael Halcrow return rc; 1012237fead6SMichael Halcrow } 1013237fead6SMichael Halcrow 10143a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 10153a60a168STyler Hicks struct kstat *stat) 10163a60a168STyler Hicks { 10173a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 10183a60a168STyler Hicks int rc = 0; 10193a60a168STyler Hicks 10203a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 10213a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 10223a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 10233a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10243a60a168STyler Hicks char *target; 10253a60a168STyler Hicks size_t targetsiz; 10263a60a168STyler Hicks 10273a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 10283a60a168STyler Hicks if (!rc) { 10293a60a168STyler Hicks kfree(target); 10303a60a168STyler Hicks stat->size = targetsiz; 10313a60a168STyler Hicks } 10323a60a168STyler Hicks } 10333a60a168STyler Hicks return rc; 10343a60a168STyler Hicks } 10353a60a168STyler Hicks 1036f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1037f8f484d1STyler Hicks struct kstat *stat) 1038f8f484d1STyler Hicks { 1039f8f484d1STyler Hicks struct kstat lower_stat; 1040f8f484d1STyler Hicks int rc; 1041f8f484d1STyler Hicks 1042f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1043f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1044f8f484d1STyler Hicks if (!rc) { 104555f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 104655f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 1047f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1048f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1049f8f484d1STyler Hicks } 1050f8f484d1STyler Hicks return rc; 1051f8f484d1STyler Hicks } 1052f8f484d1STyler Hicks 1053dd2a3b7aSMichael Halcrow int 1054237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1055237fead6SMichael Halcrow size_t size, int flags) 1056237fead6SMichael Halcrow { 1057237fead6SMichael Halcrow int rc = 0; 1058237fead6SMichael Halcrow struct dentry *lower_dentry; 1059237fead6SMichael Halcrow 1060237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1061237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1062cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1063237fead6SMichael Halcrow goto out; 1064237fead6SMichael Halcrow } 106548b512e6SRoberto Sassu 106648b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1067545d6809STyler Hicks if (!rc) 1068545d6809STyler Hicks fsstack_copy_attr_all(dentry->d_inode, lower_dentry->d_inode); 1069237fead6SMichael Halcrow out: 1070237fead6SMichael Halcrow return rc; 1071237fead6SMichael Halcrow } 1072237fead6SMichael Halcrow 1073dd2a3b7aSMichael Halcrow ssize_t 1074d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1075d7cdc5feSMichael Halcrow void *value, size_t size) 1076d7cdc5feSMichael Halcrow { 1077d7cdc5feSMichael Halcrow int rc = 0; 1078d7cdc5feSMichael Halcrow 1079d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1080cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1081d7cdc5feSMichael Halcrow goto out; 1082d7cdc5feSMichael Halcrow } 1083d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1084d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1085d7cdc5feSMichael Halcrow size); 1086d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1087d7cdc5feSMichael Halcrow out: 1088d7cdc5feSMichael Halcrow return rc; 1089d7cdc5feSMichael Halcrow } 1090d7cdc5feSMichael Halcrow 10917896b631SAdrian Bunk static ssize_t 1092237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1093237fead6SMichael Halcrow size_t size) 1094237fead6SMichael Halcrow { 10952ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10962ed92554SMichael Halcrow value, size); 1097237fead6SMichael Halcrow } 1098237fead6SMichael Halcrow 1099237fead6SMichael Halcrow static ssize_t 1100237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1101237fead6SMichael Halcrow { 1102237fead6SMichael Halcrow int rc = 0; 1103237fead6SMichael Halcrow struct dentry *lower_dentry; 1104237fead6SMichael Halcrow 1105237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1106237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1107cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1108237fead6SMichael Halcrow goto out; 1109237fead6SMichael Halcrow } 1110237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1111237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1112237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1113237fead6SMichael Halcrow out: 1114237fead6SMichael Halcrow return rc; 1115237fead6SMichael Halcrow } 1116237fead6SMichael Halcrow 1117237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1118237fead6SMichael Halcrow { 1119237fead6SMichael Halcrow int rc = 0; 1120237fead6SMichael Halcrow struct dentry *lower_dentry; 1121237fead6SMichael Halcrow 1122237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1123237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1124cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1125237fead6SMichael Halcrow goto out; 1126237fead6SMichael Halcrow } 1127237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1128237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1129237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1130237fead6SMichael Halcrow out: 1131237fead6SMichael Halcrow return rc; 1132237fead6SMichael Halcrow } 1133237fead6SMichael Halcrow 1134754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1135408bd629SAl Viro .readlink = generic_readlink, 1136237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1137237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1138237fead6SMichael Halcrow .permission = ecryptfs_permission, 1139237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11403a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1141237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1142237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1143237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1144237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1145237fead6SMichael Halcrow }; 1146237fead6SMichael Halcrow 1147754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1148237fead6SMichael Halcrow .create = ecryptfs_create, 1149237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1150237fead6SMichael Halcrow .link = ecryptfs_link, 1151237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1152237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1153237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1154237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1155237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1156237fead6SMichael Halcrow .rename = ecryptfs_rename, 1157237fead6SMichael Halcrow .permission = ecryptfs_permission, 1158237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1159237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1160237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1161237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1162237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1163237fead6SMichael Halcrow }; 1164237fead6SMichael Halcrow 1165754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1166237fead6SMichael Halcrow .permission = ecryptfs_permission, 1167237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1168f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1169237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1170237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1171237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1172237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1173237fead6SMichael Halcrow }; 1174