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 } 201312b63fbSAl Viro rc = vfs_create(lower_dir_dentry->d_inode, lower_dentry, mode, true); 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 */ 230e3ccaa97STyler Hicks 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 * 271237fead6SMichael Halcrow * Creates a new file. 272237fead6SMichael Halcrow * 273237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 274237fead6SMichael Halcrow */ 275237fead6SMichael Halcrow static int 276237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 277ebfc3b49SAl Viro umode_t mode, bool excl) 278237fead6SMichael Halcrow { 279b59db43aSTyler Hicks struct inode *ecryptfs_inode; 280237fead6SMichael Halcrow int rc; 281237fead6SMichael Halcrow 282b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 283b59db43aSTyler Hicks mode); 284b59db43aSTyler Hicks if (unlikely(IS_ERR(ecryptfs_inode))) { 285237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 286237fead6SMichael Halcrow "lower filesystem\n"); 287b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 288237fead6SMichael Halcrow goto out; 289237fead6SMichael Halcrow } 290237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 291237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 292b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 293b59db43aSTyler Hicks if (rc) { 2948bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2958bc2d3cfSTyler Hicks ecryptfs_inode); 2968bc2d3cfSTyler Hicks make_bad_inode(ecryptfs_inode); 297b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 298b59db43aSTyler Hicks iput(ecryptfs_inode); 299b59db43aSTyler Hicks goto out; 300b59db43aSTyler Hicks } 301b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 3028fc37ec5SAl Viro d_instantiate(ecryptfs_dentry, ecryptfs_inode); 303237fead6SMichael Halcrow out: 304237fead6SMichael Halcrow return rc; 305237fead6SMichael Halcrow } 306237fead6SMichael Halcrow 307778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 308237fead6SMichael Halcrow { 3092aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 310778aeb42STyler Hicks int rc; 311237fead6SMichael Halcrow 312778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 313391b52f9SMichael Halcrow if (rc) { 314391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 315332ab16fSTyler Hicks "the lower file for the dentry with name " 316391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 317778aeb42STyler Hicks dentry->d_name.name, rc); 318778aeb42STyler Hicks return rc; 319391b52f9SMichael Halcrow } 320778aeb42STyler Hicks 3213b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3222aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3232aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3242aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 325778aeb42STyler Hicks 326778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 327778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 328237fead6SMichael Halcrow if (rc) { 329778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 330778aeb42STyler Hicks if (!rc) 331dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 332dd2a3b7aSMichael Halcrow } 333778aeb42STyler Hicks 334778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 335778aeb42STyler Hicks return 0; 336778aeb42STyler Hicks } 337778aeb42STyler Hicks 338778aeb42STyler Hicks /** 339778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 340778aeb42STyler Hicks */ 341778aeb42STyler Hicks static int ecryptfs_lookup_interpose(struct dentry *dentry, 342778aeb42STyler Hicks struct dentry *lower_dentry, 343778aeb42STyler Hicks struct inode *dir_inode) 344778aeb42STyler Hicks { 345778aeb42STyler Hicks struct inode *inode, *lower_inode = lower_dentry->d_inode; 346778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 347778aeb42STyler Hicks struct vfsmount *lower_mnt; 348778aeb42STyler Hicks int rc = 0; 349778aeb42STyler Hicks 350778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 351778aeb42STyler Hicks if (!dentry_info) { 352778aeb42STyler Hicks printk(KERN_ERR "%s: Out of memory whilst attempting " 353778aeb42STyler Hicks "to allocate ecryptfs_dentry_info struct\n", 354778aeb42STyler Hicks __func__); 355237fead6SMichael Halcrow dput(lower_dentry); 356778aeb42STyler Hicks return -ENOMEM; 357778aeb42STyler Hicks } 3580b1d9011SAl Viro 3590b1d9011SAl Viro lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 3600b1d9011SAl Viro fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); 36184d08fa8SAl Viro BUG_ON(!d_count(lower_dentry)); 3620b1d9011SAl Viro 3630b1d9011SAl Viro ecryptfs_set_dentry_private(dentry, dentry_info); 36492dd1230SAl Viro dentry_info->lower_path.mnt = lower_mnt; 36592dd1230SAl Viro dentry_info->lower_path.dentry = lower_dentry; 366778aeb42STyler Hicks 367778aeb42STyler Hicks if (!lower_dentry->d_inode) { 368778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 369778aeb42STyler Hicks d_add(dentry, NULL); 370778aeb42STyler Hicks return 0; 371778aeb42STyler Hicks } 372778aeb42STyler Hicks inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); 373778aeb42STyler Hicks if (IS_ERR(inode)) { 374778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 375778aeb42STyler Hicks __func__, PTR_ERR(inode)); 376778aeb42STyler Hicks return PTR_ERR(inode); 377778aeb42STyler Hicks } 378778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 379778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 380778aeb42STyler Hicks if (rc) { 381778aeb42STyler Hicks make_bad_inode(inode); 382778aeb42STyler Hicks return rc; 383778aeb42STyler Hicks } 384778aeb42STyler Hicks } 385778aeb42STyler Hicks 386778aeb42STyler Hicks if (inode->i_state & I_NEW) 387778aeb42STyler Hicks unlock_new_inode(inode); 388778aeb42STyler Hicks d_add(dentry, inode); 389778aeb42STyler Hicks 390addd65adSMichael Halcrow return rc; 391addd65adSMichael Halcrow } 392addd65adSMichael Halcrow 393addd65adSMichael Halcrow /** 394addd65adSMichael Halcrow * ecryptfs_lookup 395addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 396addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 397addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 398addd65adSMichael Halcrow * 399addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 400addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 401addd65adSMichael Halcrow */ 402addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 403addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 40400cd8dd3SAl Viro unsigned int flags) 405addd65adSMichael Halcrow { 406addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 407a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 408addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 409addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 410addd65adSMichael Halcrow int rc = 0; 411addd65adSMichael Halcrow 412addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 4138787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4148787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 4158787c7a3STyler Hicks lower_dir_dentry, 4168787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 4178787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 418addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 419addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4208787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4219f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 422bc65a121SAl Viro ecryptfs_dentry->d_name.name); 423bc65a121SAl Viro goto out; 424addd65adSMichael Halcrow } 425addd65adSMichael Halcrow if (lower_dentry->d_inode) 4265ccf9203STyler Hicks goto interpose; 427addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 428addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4292aac0cf8STyler Hicks if (!(mount_crypt_stat 4302aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 4315ccf9203STyler Hicks goto interpose; 432addd65adSMichael Halcrow dput(lower_dentry); 433addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 434addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4352aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 436addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 437addd65adSMichael Halcrow if (rc) { 438addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 439addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 440bc65a121SAl Viro goto out; 441addd65adSMichael Halcrow } 4428787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4438787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4448787c7a3STyler Hicks lower_dir_dentry, 4458787c7a3STyler Hicks encrypted_and_encoded_name_size); 4468787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 447addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 448addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4498787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4509f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 451addd65adSMichael Halcrow encrypted_and_encoded_name); 452bc65a121SAl Viro goto out; 453addd65adSMichael Halcrow } 4545ccf9203STyler Hicks interpose: 4555ccf9203STyler Hicks rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, 45670b89021STyler Hicks ecryptfs_dir_inode); 457addd65adSMichael Halcrow out: 458addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 459237fead6SMichael Halcrow return ERR_PTR(rc); 460237fead6SMichael Halcrow } 461237fead6SMichael Halcrow 462237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 463237fead6SMichael Halcrow struct dentry *new_dentry) 464237fead6SMichael Halcrow { 465237fead6SMichael Halcrow struct dentry *lower_old_dentry; 466237fead6SMichael Halcrow struct dentry *lower_new_dentry; 467237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 468237fead6SMichael Halcrow u64 file_size_save; 469237fead6SMichael Halcrow int rc; 470237fead6SMichael Halcrow 471237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 472237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 473237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 474237fead6SMichael Halcrow dget(lower_old_dentry); 475237fead6SMichael Halcrow dget(lower_new_dentry); 476237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 477237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 478237fead6SMichael Halcrow lower_new_dentry); 479237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 480237fead6SMichael Halcrow goto out_lock; 4815ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 482237fead6SMichael Halcrow if (rc) 483237fead6SMichael Halcrow goto out_lock; 4843a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4853a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 486bfe86848SMiklos Szeredi set_nlink(old_dentry->d_inode, 487bfe86848SMiklos Szeredi ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); 488237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 489237fead6SMichael Halcrow out_lock: 490237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 491237fead6SMichael Halcrow dput(lower_new_dentry); 492237fead6SMichael Halcrow dput(lower_old_dentry); 493237fead6SMichael Halcrow return rc; 494237fead6SMichael Halcrow } 495237fead6SMichael Halcrow 496237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 497237fead6SMichael Halcrow { 4988bc2d3cfSTyler Hicks return ecryptfs_do_unlink(dir, dentry, dentry->d_inode); 499237fead6SMichael Halcrow } 500237fead6SMichael Halcrow 501237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 502237fead6SMichael Halcrow const char *symname) 503237fead6SMichael Halcrow { 504237fead6SMichael Halcrow int rc; 505237fead6SMichael Halcrow struct dentry *lower_dentry; 506237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 507237fead6SMichael Halcrow char *encoded_symname; 508addd65adSMichael Halcrow size_t encoded_symlen; 509addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 510237fead6SMichael Halcrow 511237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 512237fead6SMichael Halcrow dget(lower_dentry); 513237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 514addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 515addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 516addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 517addd65adSMichael Halcrow &encoded_symlen, 518addd65adSMichael Halcrow NULL, 519addd65adSMichael Halcrow mount_crypt_stat, symname, 520addd65adSMichael Halcrow strlen(symname)); 521addd65adSMichael Halcrow if (rc) 522237fead6SMichael Halcrow goto out_lock; 523237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 524db2e747bSMiklos Szeredi encoded_symname); 525237fead6SMichael Halcrow kfree(encoded_symname); 526237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 527237fead6SMichael Halcrow goto out_lock; 5285ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 529237fead6SMichael Halcrow if (rc) 530237fead6SMichael Halcrow goto out_lock; 5310cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5320cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 533237fead6SMichael Halcrow out_lock: 534237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 535237fead6SMichael Halcrow dput(lower_dentry); 536237fead6SMichael Halcrow if (!dentry->d_inode) 537237fead6SMichael Halcrow d_drop(dentry); 538237fead6SMichael Halcrow return rc; 539237fead6SMichael Halcrow } 540237fead6SMichael Halcrow 54118bb1db3SAl Viro static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 542237fead6SMichael Halcrow { 543237fead6SMichael Halcrow int rc; 544237fead6SMichael Halcrow struct dentry *lower_dentry; 545237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 546237fead6SMichael Halcrow 547237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 548237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 549237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 550237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 551237fead6SMichael Halcrow goto out; 5525ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 553237fead6SMichael Halcrow if (rc) 554237fead6SMichael Halcrow goto out; 5550cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5560cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 557bfe86848SMiklos Szeredi set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); 558237fead6SMichael Halcrow out: 559237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 560237fead6SMichael Halcrow if (!dentry->d_inode) 561237fead6SMichael Halcrow d_drop(dentry); 562237fead6SMichael Halcrow return rc; 563237fead6SMichael Halcrow } 564237fead6SMichael Halcrow 565237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 566237fead6SMichael Halcrow { 567237fead6SMichael Halcrow struct dentry *lower_dentry; 568237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 56945ec4abaSMichael Halcrow int rc; 570237fead6SMichael Halcrow 571237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 57245ec4abaSMichael Halcrow dget(dentry); 573237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 57445ec4abaSMichael Halcrow dget(lower_dentry); 575237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 57645ec4abaSMichael Halcrow dput(lower_dentry); 57707850552STyler Hicks if (!rc && dentry->d_inode) 57807850552STyler Hicks clear_nlink(dentry->d_inode); 5790cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 580bfe86848SMiklos Szeredi set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); 581237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 582237fead6SMichael Halcrow if (!rc) 583237fead6SMichael Halcrow d_drop(dentry); 58445ec4abaSMichael Halcrow dput(dentry); 585237fead6SMichael Halcrow return rc; 586237fead6SMichael Halcrow } 587237fead6SMichael Halcrow 588237fead6SMichael Halcrow static int 5891a67aafbSAl Viro ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 590237fead6SMichael Halcrow { 591237fead6SMichael Halcrow int rc; 592237fead6SMichael Halcrow struct dentry *lower_dentry; 593237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 594237fead6SMichael Halcrow 595237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 596237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 597237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 598237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 599237fead6SMichael Halcrow goto out; 6005ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 601237fead6SMichael Halcrow if (rc) 602237fead6SMichael Halcrow goto out; 6030cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6040cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 605237fead6SMichael Halcrow out: 606237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 607237fead6SMichael Halcrow if (!dentry->d_inode) 608237fead6SMichael Halcrow d_drop(dentry); 609237fead6SMichael Halcrow return rc; 610237fead6SMichael Halcrow } 611237fead6SMichael Halcrow 612237fead6SMichael Halcrow static int 613237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 614237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 615237fead6SMichael Halcrow { 616237fead6SMichael Halcrow int rc; 617237fead6SMichael Halcrow struct dentry *lower_old_dentry; 618237fead6SMichael Halcrow struct dentry *lower_new_dentry; 619237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 620237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6210d132f73SErez Zadok struct dentry *trap = NULL; 6228335eafcSTyler Hicks struct inode *target_inode; 623237fead6SMichael Halcrow 624237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 625237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 626237fead6SMichael Halcrow dget(lower_old_dentry); 627237fead6SMichael Halcrow dget(lower_new_dentry); 628237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 629237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6308335eafcSTyler Hicks target_inode = new_dentry->d_inode; 6310d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6320d132f73SErez Zadok /* source should not be ancestor of target */ 6330d132f73SErez Zadok if (trap == lower_old_dentry) { 6340d132f73SErez Zadok rc = -EINVAL; 6350d132f73SErez Zadok goto out_lock; 6360d132f73SErez Zadok } 6370d132f73SErez Zadok /* target should not be ancestor of source */ 6380d132f73SErez Zadok if (trap == lower_new_dentry) { 6390d132f73SErez Zadok rc = -ENOTEMPTY; 6400d132f73SErez Zadok goto out_lock; 6410d132f73SErez Zadok } 642237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 643237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 644237fead6SMichael Halcrow if (rc) 645237fead6SMichael Halcrow goto out_lock; 6468335eafcSTyler Hicks if (target_inode) 6478335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6488335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6499afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 650237fead6SMichael Halcrow if (new_dir != old_dir) 6519afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 652237fead6SMichael Halcrow out_lock: 653237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 654dd55c898STyler Hicks dput(lower_new_dir_dentry); 655dd55c898STyler Hicks dput(lower_old_dir_dentry); 656237fead6SMichael Halcrow dput(lower_new_dentry); 657237fead6SMichael Halcrow dput(lower_old_dentry); 658237fead6SMichael Halcrow return rc; 659237fead6SMichael Halcrow } 660237fead6SMichael Halcrow 6613a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6623a60a168STyler Hicks size_t *bufsiz) 663237fead6SMichael Halcrow { 6643a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 665237fead6SMichael Halcrow char *lower_buf; 666addd65adSMichael Halcrow mm_segment_t old_fs; 667addd65adSMichael Halcrow int rc; 668237fead6SMichael Halcrow 669408bd629SAl Viro lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); 6703a60a168STyler Hicks if (!lower_buf) { 671237fead6SMichael Halcrow rc = -ENOMEM; 672237fead6SMichael Halcrow goto out; 673237fead6SMichael Halcrow } 674237fead6SMichael Halcrow old_fs = get_fs(); 675237fead6SMichael Halcrow set_fs(get_ds()); 676237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 677237fead6SMichael Halcrow (char __user *)lower_buf, 678408bd629SAl Viro PATH_MAX); 679237fead6SMichael Halcrow set_fs(old_fs); 6803a60a168STyler Hicks if (rc < 0) 6813a60a168STyler Hicks goto out; 6820747fdb2SAl Viro rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry->d_sb, 683408bd629SAl Viro lower_buf, rc); 6843a60a168STyler Hicks out: 685237fead6SMichael Halcrow kfree(lower_buf); 6863a60a168STyler Hicks return rc; 6873a60a168STyler Hicks } 6883a60a168STyler Hicks 689237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 690237fead6SMichael Halcrow { 691237fead6SMichael Halcrow char *buf; 692408bd629SAl Viro size_t len = PATH_MAX; 693408bd629SAl Viro int rc; 694237fead6SMichael Halcrow 695408bd629SAl Viro rc = ecryptfs_readlink_lower(dentry, &buf, &len); 696408bd629SAl Viro if (rc) 697237fead6SMichael Halcrow goto out; 698408bd629SAl Viro fsstack_copy_attr_atime(dentry->d_inode, 699408bd629SAl Viro ecryptfs_dentry_to_lower(dentry)->d_inode); 700408bd629SAl Viro buf[len] = '\0'; 701237fead6SMichael Halcrow out: 702806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 703806892e9SOGAWA Hirofumi return NULL; 704237fead6SMichael Halcrow } 705237fead6SMichael Halcrow 706237fead6SMichael Halcrow /** 707237fead6SMichael Halcrow * upper_size_to_lower_size 708237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 709237fead6SMichael Halcrow * @upper_size: Size of the upper file 710237fead6SMichael Halcrow * 711cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 712237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 713237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 714237fead6SMichael Halcrow * 715237fead6SMichael Halcrow * Returns Calculated size of the lower file. 716237fead6SMichael Halcrow */ 717237fead6SMichael Halcrow static loff_t 718237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 719237fead6SMichael Halcrow loff_t upper_size) 720237fead6SMichael Halcrow { 721237fead6SMichael Halcrow loff_t lower_size; 722237fead6SMichael Halcrow 723157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 724237fead6SMichael Halcrow if (upper_size != 0) { 725237fead6SMichael Halcrow loff_t num_extents; 726237fead6SMichael Halcrow 727237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 728237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 729237fead6SMichael Halcrow num_extents++; 730237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 731237fead6SMichael Halcrow } 732237fead6SMichael Halcrow return lower_size; 733237fead6SMichael Halcrow } 734237fead6SMichael Halcrow 735237fead6SMichael Halcrow /** 7365f3ef64fSTyler Hicks * truncate_upper 737237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7385f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7395f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 740237fead6SMichael Halcrow * 741237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 742237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7435f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7445f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7455f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7465f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7475f3ef64fSTyler Hicks * the truncation of the lower inode. 748237fead6SMichael Halcrow * 749237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 750237fead6SMichael Halcrow */ 7515f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7525f3ef64fSTyler Hicks struct iattr *lower_ia) 753237fead6SMichael Halcrow { 754237fead6SMichael Halcrow int rc = 0; 755237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 756237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 757237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 758237fead6SMichael Halcrow loff_t lower_size_before_truncate; 759237fead6SMichael Halcrow loff_t lower_size_after_truncate; 760237fead6SMichael Halcrow 7615f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7625f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 763332ab16fSTyler Hicks return 0; 7645f3ef64fSTyler Hicks } 7653b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 766332ab16fSTyler Hicks if (rc) 767332ab16fSTyler Hicks return rc; 768237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 769237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7705f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7712ed92554SMichael Halcrow char zero[] = { 0x00 }; 772240e2df5SMichael Halcrow 7735f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7742ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7752ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7762ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7772ed92554SMichael Halcrow * file and the new and of the file */ 77848c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7795f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7805f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7815f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7825f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 7835f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 7842ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 7852ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 7865f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 7872ed92554SMichael Halcrow 7882c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7892c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7905f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7915f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 79248c1e44aSAl Viro goto out; 79313a791b4STyler Hicks } 7942ed92554SMichael Halcrow if (num_zeros) { 7952ed92554SMichael Halcrow char *zeros_virt; 7962ed92554SMichael Halcrow 7972ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7982ed92554SMichael Halcrow if (!zeros_virt) { 7992ed92554SMichael Halcrow rc = -ENOMEM; 80048c1e44aSAl Viro goto out; 801240e2df5SMichael Halcrow } 80248c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8035f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8042ed92554SMichael Halcrow kfree(zeros_virt); 8055dda6992SMichael Halcrow if (rc) { 806240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 807240e2df5SMichael Halcrow "the remainder of the end page on " 808240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 80948c1e44aSAl Viro goto out; 810240e2df5SMichael Halcrow } 811240e2df5SMichael Halcrow } 8122c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8130216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 814dd2a3b7aSMichael Halcrow if (rc) { 815dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 816dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 817dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 81848c1e44aSAl Viro goto out; 819dd2a3b7aSMichael Halcrow } 820237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 821237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 822237fead6SMichael Halcrow lower_size_before_truncate = 823237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 824237fead6SMichael Halcrow lower_size_after_truncate = 8255f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8265f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8275f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8285f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8295f3ef64fSTyler Hicks } else 8305f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 831237fead6SMichael Halcrow } 832237fead6SMichael Halcrow out: 833332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 834237fead6SMichael Halcrow return rc; 835237fead6SMichael Halcrow } 836237fead6SMichael Halcrow 837a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 838a261a039STyler Hicks { 839a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 840a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 841a261a039STyler Hicks 842a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 843a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 844a261a039STyler Hicks i_size_read(inode)); 845a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 846a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 847a261a039STyler Hicks /* 848a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 849a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 850a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 851a261a039STyler Hicks * from other filesystems. 852a261a039STyler Hicks */ 853a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 854a261a039STyler Hicks } 855a261a039STyler Hicks 856a261a039STyler Hicks return 0; 857a261a039STyler Hicks } 858a261a039STyler Hicks 8595f3ef64fSTyler Hicks /** 8605f3ef64fSTyler Hicks * ecryptfs_truncate 8615f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8625f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8635f3ef64fSTyler Hicks * 8645f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8655f3ef64fSTyler Hicks * its corresponding lower inode. 8665f3ef64fSTyler Hicks * 8675f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8685f3ef64fSTyler Hicks */ 8695f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8705f3ef64fSTyler Hicks { 8715f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8725f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8735f3ef64fSTyler Hicks int rc; 8745f3ef64fSTyler Hicks 875a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length); 876a261a039STyler Hicks if (rc) 877a261a039STyler Hicks return rc; 878a261a039STyler Hicks 8795f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8805f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8815f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8825f3ef64fSTyler Hicks 8835f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 8845f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 8855f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 8865f3ef64fSTyler Hicks } 8875f3ef64fSTyler Hicks return rc; 8885f3ef64fSTyler Hicks } 8895f3ef64fSTyler Hicks 890237fead6SMichael Halcrow static int 89110556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 892237fead6SMichael Halcrow { 893f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 894237fead6SMichael Halcrow } 895237fead6SMichael Halcrow 896237fead6SMichael Halcrow /** 897237fead6SMichael Halcrow * ecryptfs_setattr 898237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 899237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 900237fead6SMichael Halcrow * 901237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 902237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 903237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 904237fead6SMichael Halcrow * 905237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 906237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 907237fead6SMichael Halcrow */ 908237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 909237fead6SMichael Halcrow { 910237fead6SMichael Halcrow int rc = 0; 911237fead6SMichael Halcrow struct dentry *lower_dentry; 9125f3ef64fSTyler Hicks struct iattr lower_ia; 913237fead6SMichael Halcrow struct inode *inode; 914237fead6SMichael Halcrow struct inode *lower_inode; 915237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 916237fead6SMichael Halcrow 917237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 918e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 919e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 920237fead6SMichael Halcrow inode = dentry->d_inode; 921237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 922e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 923e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 924e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 925e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 92664ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 92764ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 92864ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 929e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 930e10f281bSMichael Halcrow 931e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 932e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9333b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 934332ab16fSTyler Hicks if (rc) { 935332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 936332ab16fSTyler Hicks goto out; 937332ab16fSTyler Hicks } 938d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 939332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9405dda6992SMichael Halcrow if (rc) { 941e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 942e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 943e10f281bSMichael Halcrow rc = -EIO; 94425bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 945e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 94625bd8174SMichael Halcrow "or the key could not be retrieved. " 94725bd8174SMichael Halcrow "Plaintext passthrough mode is not " 948e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 949e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 950e10f281bSMichael Halcrow goto out; 951e10f281bSMichael Halcrow } 952e10f281bSMichael Halcrow rc = 0; 9533aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9543aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 955e10f281bSMichael Halcrow } 956e10f281bSMichael Halcrow } 957e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 958a261a039STyler Hicks 959a261a039STyler Hicks rc = inode_change_ok(inode, ia); 960a261a039STyler Hicks if (rc) 961a261a039STyler Hicks goto out; 962a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 963a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 964a261a039STyler Hicks if (rc) 965a261a039STyler Hicks goto out; 966a261a039STyler Hicks } 967a261a039STyler Hicks 9685f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9695f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9705f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 971237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9725f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 973237fead6SMichael Halcrow if (rc < 0) 974237fead6SMichael Halcrow goto out; 975237fead6SMichael Halcrow } 9761ac564ecSJeff Layton 9771ac564ecSJeff Layton /* 9781ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9791ac564ecSJeff Layton * to interpret this in its own way. 9801ac564ecSJeff Layton */ 9815f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9825f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9831ac564ecSJeff Layton 9849c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 9855f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9869c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 987237fead6SMichael Halcrow out: 9889afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 989237fead6SMichael Halcrow return rc; 990237fead6SMichael Halcrow } 991237fead6SMichael Halcrow 992111d61a2STyler Hicks static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 9933a60a168STyler Hicks struct kstat *stat) 9943a60a168STyler Hicks { 9953a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9963a60a168STyler Hicks int rc = 0; 9973a60a168STyler Hicks 9983a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9993a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 10003a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 10013a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10023a60a168STyler Hicks char *target; 10033a60a168STyler Hicks size_t targetsiz; 10043a60a168STyler Hicks 10053a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 10063a60a168STyler Hicks if (!rc) { 10073a60a168STyler Hicks kfree(target); 10083a60a168STyler Hicks stat->size = targetsiz; 10093a60a168STyler Hicks } 10103a60a168STyler Hicks } 10113a60a168STyler Hicks return rc; 10123a60a168STyler Hicks } 10133a60a168STyler Hicks 1014111d61a2STyler Hicks static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1015f8f484d1STyler Hicks struct kstat *stat) 1016f8f484d1STyler Hicks { 1017f8f484d1STyler Hicks struct kstat lower_stat; 1018f8f484d1STyler Hicks int rc; 1019f8f484d1STyler Hicks 10203dadecceSAl Viro rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat); 1021f8f484d1STyler Hicks if (!rc) { 102255f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 102355f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 1024f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1025f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1026f8f484d1STyler Hicks } 1027f8f484d1STyler Hicks return rc; 1028f8f484d1STyler Hicks } 1029f8f484d1STyler Hicks 1030dd2a3b7aSMichael Halcrow int 1031237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1032237fead6SMichael Halcrow size_t size, int flags) 1033237fead6SMichael Halcrow { 1034237fead6SMichael Halcrow int rc = 0; 1035237fead6SMichael Halcrow struct dentry *lower_dentry; 1036237fead6SMichael Halcrow 1037237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1038237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1039cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1040237fead6SMichael Halcrow goto out; 1041237fead6SMichael Halcrow } 104248b512e6SRoberto Sassu 104348b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1044545d6809STyler Hicks if (!rc) 1045545d6809STyler Hicks fsstack_copy_attr_all(dentry->d_inode, lower_dentry->d_inode); 1046237fead6SMichael Halcrow out: 1047237fead6SMichael Halcrow return rc; 1048237fead6SMichael Halcrow } 1049237fead6SMichael Halcrow 1050dd2a3b7aSMichael Halcrow ssize_t 1051d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1052d7cdc5feSMichael Halcrow void *value, size_t size) 1053d7cdc5feSMichael Halcrow { 1054d7cdc5feSMichael Halcrow int rc = 0; 1055d7cdc5feSMichael Halcrow 1056d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1057cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1058d7cdc5feSMichael Halcrow goto out; 1059d7cdc5feSMichael Halcrow } 1060d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1061d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1062d7cdc5feSMichael Halcrow size); 1063d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1064d7cdc5feSMichael Halcrow out: 1065d7cdc5feSMichael Halcrow return rc; 1066d7cdc5feSMichael Halcrow } 1067d7cdc5feSMichael Halcrow 10687896b631SAdrian Bunk static ssize_t 1069237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1070237fead6SMichael Halcrow size_t size) 1071237fead6SMichael Halcrow { 10722ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10732ed92554SMichael Halcrow value, size); 1074237fead6SMichael Halcrow } 1075237fead6SMichael Halcrow 1076237fead6SMichael Halcrow static ssize_t 1077237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1078237fead6SMichael Halcrow { 1079237fead6SMichael Halcrow int rc = 0; 1080237fead6SMichael Halcrow struct dentry *lower_dentry; 1081237fead6SMichael Halcrow 1082237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1083237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1084cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1085237fead6SMichael Halcrow goto out; 1086237fead6SMichael Halcrow } 1087237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1088237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1089237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1090237fead6SMichael Halcrow out: 1091237fead6SMichael Halcrow return rc; 1092237fead6SMichael Halcrow } 1093237fead6SMichael Halcrow 1094237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1095237fead6SMichael Halcrow { 1096237fead6SMichael Halcrow int rc = 0; 1097237fead6SMichael Halcrow struct dentry *lower_dentry; 1098237fead6SMichael Halcrow 1099237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1100237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1101cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1102237fead6SMichael Halcrow goto out; 1103237fead6SMichael Halcrow } 1104237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1105237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1106237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1107237fead6SMichael Halcrow out: 1108237fead6SMichael Halcrow return rc; 1109237fead6SMichael Halcrow } 1110237fead6SMichael Halcrow 1111754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1112408bd629SAl Viro .readlink = generic_readlink, 1113237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 111487dc800bSAl Viro .put_link = kfree_put_link, 1115237fead6SMichael Halcrow .permission = ecryptfs_permission, 1116237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11173a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1118237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1119237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1120237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1121237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1122237fead6SMichael Halcrow }; 1123237fead6SMichael Halcrow 1124754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1125237fead6SMichael Halcrow .create = ecryptfs_create, 1126237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1127237fead6SMichael Halcrow .link = ecryptfs_link, 1128237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1129237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1130237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1131237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1132237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1133237fead6SMichael Halcrow .rename = ecryptfs_rename, 1134237fead6SMichael Halcrow .permission = ecryptfs_permission, 1135237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1136237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1137237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1138237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1139237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1140237fead6SMichael Halcrow }; 1141237fead6SMichael Halcrow 1142754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1143237fead6SMichael Halcrow .permission = ecryptfs_permission, 1144237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1145f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1146237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1147237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1148237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1149237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1150237fead6SMichael Halcrow }; 1151