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 { 56c4cf3ba4SHimangi Saraogi return ecryptfs_inode_to_lower(inode) == lower_inode; 57c4f79073STyler Hicks } 58c4f79073STyler Hicks 595ccf9203STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *opaque) 60c4f79073STyler Hicks { 615ccf9203STyler Hicks struct inode *lower_inode = opaque; 625ccf9203STyler Hicks 635ccf9203STyler Hicks ecryptfs_set_inode_lower(inode, lower_inode); 645ccf9203STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 655ccf9203STyler Hicks /* i_size will be overwritten for encrypted regular files */ 665ccf9203STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 675ccf9203STyler Hicks inode->i_ino = lower_inode->i_ino; 68c4f79073STyler Hicks inode->i_version++; 69c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 70985ca0e6SThieu Le inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; 715ccf9203STyler Hicks 725ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 735ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 745ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 755ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 765ccf9203STyler Hicks else 775ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 785ccf9203STyler Hicks 795ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 805ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 815ccf9203STyler Hicks else if (special_file(inode->i_mode)) 825ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 835ccf9203STyler Hicks else 845ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 855ccf9203STyler Hicks 86c4f79073STyler Hicks return 0; 87c4f79073STyler Hicks } 88c4f79073STyler Hicks 895ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 905ccf9203STyler Hicks struct super_block *sb) 915ccf9203STyler Hicks { 925ccf9203STyler Hicks struct inode *inode; 935ccf9203STyler Hicks 945ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 955ccf9203STyler Hicks return ERR_PTR(-EXDEV); 965ccf9203STyler Hicks if (!igrab(lower_inode)) 975ccf9203STyler Hicks return ERR_PTR(-ESTALE); 985ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 995ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 1005ccf9203STyler Hicks lower_inode); 1015ccf9203STyler Hicks if (!inode) { 1025ccf9203STyler Hicks iput(lower_inode); 1035ccf9203STyler Hicks return ERR_PTR(-EACCES); 1045ccf9203STyler Hicks } 1055ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 1065ccf9203STyler Hicks iput(lower_inode); 1075ccf9203STyler Hicks 1085ccf9203STyler Hicks return inode; 1095ccf9203STyler Hicks } 1105ccf9203STyler Hicks 111c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 112c4f79073STyler Hicks struct super_block *sb) 113c4f79073STyler Hicks { 1145ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 115c4f79073STyler Hicks 1165ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 117c4f79073STyler Hicks unlock_new_inode(inode); 1185ccf9203STyler Hicks 119c4f79073STyler Hicks return inode; 120c4f79073STyler Hicks } 121c4f79073STyler Hicks 122c4f79073STyler Hicks /** 123c4f79073STyler Hicks * ecryptfs_interpose 124c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 125c4f79073STyler Hicks * @dentry: ecryptfs' dentry 126c4f79073STyler Hicks * @sb: ecryptfs's super_block 127c4f79073STyler Hicks * 128c4f79073STyler Hicks * Interposes upper and lower dentries. 129c4f79073STyler Hicks * 130c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 131c4f79073STyler Hicks */ 132c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1335ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 134c4f79073STyler Hicks { 1355ccf9203STyler Hicks struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb); 1365ccf9203STyler Hicks 137c4f79073STyler Hicks if (IS_ERR(inode)) 138c4f79073STyler Hicks return PTR_ERR(inode); 139c4f79073STyler Hicks d_instantiate(dentry, inode); 1405ccf9203STyler Hicks 141c4f79073STyler Hicks return 0; 142c4f79073STyler Hicks } 143c4f79073STyler Hicks 1448bc2d3cfSTyler Hicks static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, 1458bc2d3cfSTyler Hicks struct inode *inode) 1468bc2d3cfSTyler Hicks { 1478bc2d3cfSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 1488bc2d3cfSTyler Hicks struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 1498bc2d3cfSTyler Hicks struct dentry *lower_dir_dentry; 1508bc2d3cfSTyler Hicks int rc; 1518bc2d3cfSTyler Hicks 1528bc2d3cfSTyler Hicks dget(lower_dentry); 1538bc2d3cfSTyler Hicks lower_dir_dentry = lock_parent(lower_dentry); 154b21996e3SJ. Bruce Fields rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); 1558bc2d3cfSTyler Hicks if (rc) { 1568bc2d3cfSTyler Hicks printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 1578bc2d3cfSTyler Hicks goto out_unlock; 1588bc2d3cfSTyler Hicks } 1598bc2d3cfSTyler Hicks fsstack_copy_attr_times(dir, lower_dir_inode); 1608bc2d3cfSTyler Hicks set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); 1618bc2d3cfSTyler Hicks inode->i_ctime = dir->i_ctime; 1628bc2d3cfSTyler Hicks d_drop(dentry); 1638bc2d3cfSTyler Hicks out_unlock: 1648bc2d3cfSTyler Hicks unlock_dir(lower_dir_dentry); 1658bc2d3cfSTyler Hicks dput(lower_dentry); 1668bc2d3cfSTyler Hicks return rc; 1678bc2d3cfSTyler Hicks } 1688bc2d3cfSTyler Hicks 169237fead6SMichael Halcrow /** 170237fead6SMichael Halcrow * ecryptfs_do_create 171237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 172237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 173237fead6SMichael Halcrow * @mode: The mode of the new file 174237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 175237fead6SMichael Halcrow * 176237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 177237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 178237fead6SMichael Halcrow * stat of the lower directory inode. 179237fead6SMichael Halcrow * 180b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 181237fead6SMichael Halcrow */ 182b59db43aSTyler Hicks static struct inode * 183237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 184175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 185237fead6SMichael Halcrow { 186237fead6SMichael Halcrow int rc; 187237fead6SMichael Halcrow struct dentry *lower_dentry; 188237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 189b59db43aSTyler Hicks struct inode *inode; 190237fead6SMichael Halcrow 191237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 192237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 193801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 194237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 195237fead6SMichael Halcrow "dentry\n"); 196b59db43aSTyler Hicks inode = ERR_CAST(lower_dir_dentry); 197237fead6SMichael Halcrow goto out; 198237fead6SMichael Halcrow } 199312b63fbSAl Viro rc = vfs_create(lower_dir_dentry->d_inode, lower_dentry, mode, true); 2004981e081SMichael Halcrow if (rc) { 201caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 20218d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 203b59db43aSTyler Hicks inode = ERR_PTR(rc); 204237fead6SMichael Halcrow goto out_lock; 205237fead6SMichael Halcrow } 206b59db43aSTyler Hicks inode = __ecryptfs_get_inode(lower_dentry->d_inode, 2075ccf9203STyler Hicks directory_inode->i_sb); 2088bc2d3cfSTyler Hicks if (IS_ERR(inode)) { 209b21996e3SJ. Bruce Fields vfs_unlink(lower_dir_dentry->d_inode, lower_dentry, NULL); 210237fead6SMichael Halcrow goto out_lock; 2118bc2d3cfSTyler Hicks } 2120cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 2130cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 214237fead6SMichael Halcrow out_lock: 215237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 216237fead6SMichael Halcrow out: 217b59db43aSTyler Hicks return inode; 218237fead6SMichael Halcrow } 219237fead6SMichael Halcrow 220237fead6SMichael Halcrow /** 221237fead6SMichael Halcrow * ecryptfs_initialize_file 222237fead6SMichael Halcrow * 223237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 224237fead6SMichael Halcrow * file with a header and first data page. 225237fead6SMichael Halcrow * 226237fead6SMichael Halcrow * Returns zero on success 227237fead6SMichael Halcrow */ 228e3ccaa97STyler Hicks int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 229b59db43aSTyler Hicks struct inode *ecryptfs_inode) 230237fead6SMichael Halcrow { 231d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 232b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 233237fead6SMichael Halcrow int rc = 0; 234237fead6SMichael Halcrow 235b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 236237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 237e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 238d7cdc5feSMichael Halcrow goto out; 239237fead6SMichael Halcrow } 240237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 241b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 242237fead6SMichael Halcrow if (rc) { 243d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 244d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 245d7cdc5feSMichael Halcrow goto out; 246237fead6SMichael Halcrow } 247b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 248391b52f9SMichael Halcrow if (rc) { 249391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 250332ab16fSTyler Hicks "the lower file for the dentry with name " 2519e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2529e78d14aSDavid Howells ecryptfs_dentry, rc); 253391b52f9SMichael Halcrow goto out; 254391b52f9SMichael Halcrow } 255b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 256332ab16fSTyler Hicks if (rc) 257d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 258b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 259237fead6SMichael Halcrow out: 260237fead6SMichael Halcrow return rc; 261237fead6SMichael Halcrow } 262237fead6SMichael Halcrow 263237fead6SMichael Halcrow /** 264237fead6SMichael Halcrow * ecryptfs_create 265237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 266237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 267237fead6SMichael Halcrow * @mode: The mode of the new file. 268237fead6SMichael Halcrow * 269237fead6SMichael Halcrow * Creates a new file. 270237fead6SMichael Halcrow * 271237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 272237fead6SMichael Halcrow */ 273237fead6SMichael Halcrow static int 274237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 275ebfc3b49SAl Viro umode_t mode, bool excl) 276237fead6SMichael Halcrow { 277b59db43aSTyler Hicks struct inode *ecryptfs_inode; 278237fead6SMichael Halcrow int rc; 279237fead6SMichael Halcrow 280b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 281b59db43aSTyler Hicks mode); 282b59db43aSTyler Hicks if (unlikely(IS_ERR(ecryptfs_inode))) { 283237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 284237fead6SMichael Halcrow "lower filesystem\n"); 285b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 286237fead6SMichael Halcrow goto out; 287237fead6SMichael Halcrow } 288237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 289237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 290b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 291b59db43aSTyler Hicks if (rc) { 2928bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2938bc2d3cfSTyler Hicks ecryptfs_inode); 2948bc2d3cfSTyler Hicks make_bad_inode(ecryptfs_inode); 295b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 296b59db43aSTyler Hicks iput(ecryptfs_inode); 297b59db43aSTyler Hicks goto out; 298b59db43aSTyler Hicks } 299b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 3008fc37ec5SAl Viro d_instantiate(ecryptfs_dentry, ecryptfs_inode); 301237fead6SMichael Halcrow out: 302237fead6SMichael Halcrow return rc; 303237fead6SMichael Halcrow } 304237fead6SMichael Halcrow 305778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 306237fead6SMichael Halcrow { 3072aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 308778aeb42STyler Hicks int rc; 309237fead6SMichael Halcrow 310778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 311391b52f9SMichael Halcrow if (rc) { 312391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 313332ab16fSTyler Hicks "the lower file for the dentry with name " 3149e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 3159e78d14aSDavid Howells dentry, rc); 316778aeb42STyler Hicks return rc; 317391b52f9SMichael Halcrow } 318778aeb42STyler Hicks 3193b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3202aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3212aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3222aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 323778aeb42STyler Hicks 324778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 325778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 326237fead6SMichael Halcrow if (rc) { 327778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 328778aeb42STyler Hicks if (!rc) 329dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 330dd2a3b7aSMichael Halcrow } 331778aeb42STyler Hicks 332778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 333778aeb42STyler Hicks return 0; 334778aeb42STyler Hicks } 335778aeb42STyler Hicks 336778aeb42STyler Hicks /** 337778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 338778aeb42STyler Hicks */ 339778aeb42STyler Hicks static int ecryptfs_lookup_interpose(struct dentry *dentry, 340778aeb42STyler Hicks struct dentry *lower_dentry, 341778aeb42STyler Hicks struct inode *dir_inode) 342778aeb42STyler Hicks { 343778aeb42STyler Hicks struct inode *inode, *lower_inode = lower_dentry->d_inode; 344778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 345778aeb42STyler Hicks struct vfsmount *lower_mnt; 346778aeb42STyler Hicks int rc = 0; 347778aeb42STyler Hicks 348778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 349778aeb42STyler Hicks if (!dentry_info) { 350778aeb42STyler Hicks printk(KERN_ERR "%s: Out of memory whilst attempting " 351778aeb42STyler Hicks "to allocate ecryptfs_dentry_info struct\n", 352778aeb42STyler Hicks __func__); 353237fead6SMichael Halcrow dput(lower_dentry); 354778aeb42STyler Hicks return -ENOMEM; 355778aeb42STyler Hicks } 3560b1d9011SAl Viro 3570b1d9011SAl Viro lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 3580b1d9011SAl Viro fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); 35984d08fa8SAl Viro BUG_ON(!d_count(lower_dentry)); 3600b1d9011SAl Viro 3610b1d9011SAl Viro ecryptfs_set_dentry_private(dentry, dentry_info); 36292dd1230SAl Viro dentry_info->lower_path.mnt = lower_mnt; 36392dd1230SAl Viro dentry_info->lower_path.dentry = lower_dentry; 364778aeb42STyler Hicks 365778aeb42STyler Hicks if (!lower_dentry->d_inode) { 366778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 367778aeb42STyler Hicks d_add(dentry, NULL); 368778aeb42STyler Hicks return 0; 369778aeb42STyler Hicks } 370778aeb42STyler Hicks inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); 371778aeb42STyler Hicks if (IS_ERR(inode)) { 372778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 373778aeb42STyler Hicks __func__, PTR_ERR(inode)); 374778aeb42STyler Hicks return PTR_ERR(inode); 375778aeb42STyler Hicks } 376778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 377778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 378778aeb42STyler Hicks if (rc) { 379778aeb42STyler Hicks make_bad_inode(inode); 380778aeb42STyler Hicks return rc; 381778aeb42STyler Hicks } 382778aeb42STyler Hicks } 383778aeb42STyler Hicks 384778aeb42STyler Hicks if (inode->i_state & I_NEW) 385778aeb42STyler Hicks unlock_new_inode(inode); 386778aeb42STyler Hicks d_add(dentry, inode); 387778aeb42STyler Hicks 388addd65adSMichael Halcrow return rc; 389addd65adSMichael Halcrow } 390addd65adSMichael Halcrow 391addd65adSMichael Halcrow /** 392addd65adSMichael Halcrow * ecryptfs_lookup 393addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 394addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 395addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 396addd65adSMichael Halcrow * 397addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 398addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 399addd65adSMichael Halcrow */ 400addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 401addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 40200cd8dd3SAl Viro unsigned int flags) 403addd65adSMichael Halcrow { 404addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 405a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 406addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 407addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 408addd65adSMichael Halcrow int rc = 0; 409addd65adSMichael Halcrow 410addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 4118787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4128787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 4138787c7a3STyler Hicks lower_dir_dentry, 4148787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 4158787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 416addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 417addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4188787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4199e78d14aSDavid Howells "[%d] on lower_dentry = [%pd]\n", __func__, rc, 4209e78d14aSDavid Howells ecryptfs_dentry); 421bc65a121SAl Viro goto out; 422addd65adSMichael Halcrow } 423addd65adSMichael Halcrow if (lower_dentry->d_inode) 4245ccf9203STyler Hicks goto interpose; 425addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 426addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4272aac0cf8STyler Hicks if (!(mount_crypt_stat 4282aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 4295ccf9203STyler Hicks goto interpose; 430addd65adSMichael Halcrow dput(lower_dentry); 431addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 432addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4332aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 434addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 435addd65adSMichael Halcrow if (rc) { 436addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 437addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 438bc65a121SAl Viro goto out; 439addd65adSMichael Halcrow } 4408787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4418787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4428787c7a3STyler Hicks lower_dir_dentry, 4438787c7a3STyler Hicks encrypted_and_encoded_name_size); 4448787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 445addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 446addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4478787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4489f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 449addd65adSMichael Halcrow encrypted_and_encoded_name); 450bc65a121SAl Viro goto out; 451addd65adSMichael Halcrow } 4525ccf9203STyler Hicks interpose: 4535ccf9203STyler Hicks rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, 45470b89021STyler Hicks ecryptfs_dir_inode); 455addd65adSMichael Halcrow out: 456addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 457237fead6SMichael Halcrow return ERR_PTR(rc); 458237fead6SMichael Halcrow } 459237fead6SMichael Halcrow 460237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 461237fead6SMichael Halcrow struct dentry *new_dentry) 462237fead6SMichael Halcrow { 463237fead6SMichael Halcrow struct dentry *lower_old_dentry; 464237fead6SMichael Halcrow struct dentry *lower_new_dentry; 465237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 466237fead6SMichael Halcrow u64 file_size_save; 467237fead6SMichael Halcrow int rc; 468237fead6SMichael Halcrow 469237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 470237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 471237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 472237fead6SMichael Halcrow dget(lower_old_dentry); 473237fead6SMichael Halcrow dget(lower_new_dentry); 474237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 475237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 476146a8595SJ. Bruce Fields lower_new_dentry, NULL); 477237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 478237fead6SMichael Halcrow goto out_lock; 4795ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 480237fead6SMichael Halcrow if (rc) 481237fead6SMichael Halcrow goto out_lock; 4823a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4833a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 484bfe86848SMiklos Szeredi set_nlink(old_dentry->d_inode, 485bfe86848SMiklos Szeredi ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); 486237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 487237fead6SMichael Halcrow out_lock: 488237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 489237fead6SMichael Halcrow dput(lower_new_dentry); 490237fead6SMichael Halcrow dput(lower_old_dentry); 491237fead6SMichael Halcrow return rc; 492237fead6SMichael Halcrow } 493237fead6SMichael Halcrow 494237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 495237fead6SMichael Halcrow { 4968bc2d3cfSTyler Hicks return ecryptfs_do_unlink(dir, dentry, dentry->d_inode); 497237fead6SMichael Halcrow } 498237fead6SMichael Halcrow 499237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 500237fead6SMichael Halcrow const char *symname) 501237fead6SMichael Halcrow { 502237fead6SMichael Halcrow int rc; 503237fead6SMichael Halcrow struct dentry *lower_dentry; 504237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 505237fead6SMichael Halcrow char *encoded_symname; 506addd65adSMichael Halcrow size_t encoded_symlen; 507addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 508237fead6SMichael Halcrow 509237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 510237fead6SMichael Halcrow dget(lower_dentry); 511237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 512addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 513addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 514addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 515addd65adSMichael Halcrow &encoded_symlen, 516addd65adSMichael Halcrow NULL, 517addd65adSMichael Halcrow mount_crypt_stat, symname, 518addd65adSMichael Halcrow strlen(symname)); 519addd65adSMichael Halcrow if (rc) 520237fead6SMichael Halcrow goto out_lock; 521237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 522db2e747bSMiklos Szeredi encoded_symname); 523237fead6SMichael Halcrow kfree(encoded_symname); 524237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 525237fead6SMichael Halcrow goto out_lock; 5265ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 527237fead6SMichael Halcrow if (rc) 528237fead6SMichael Halcrow goto out_lock; 5290cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5300cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 531237fead6SMichael Halcrow out_lock: 532237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 533237fead6SMichael Halcrow dput(lower_dentry); 534237fead6SMichael Halcrow if (!dentry->d_inode) 535237fead6SMichael Halcrow d_drop(dentry); 536237fead6SMichael Halcrow return rc; 537237fead6SMichael Halcrow } 538237fead6SMichael Halcrow 53918bb1db3SAl Viro static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 540237fead6SMichael Halcrow { 541237fead6SMichael Halcrow int rc; 542237fead6SMichael Halcrow struct dentry *lower_dentry; 543237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 544237fead6SMichael Halcrow 545237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 546237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 547237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 548237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 549237fead6SMichael Halcrow goto out; 5505ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 551237fead6SMichael Halcrow if (rc) 552237fead6SMichael Halcrow goto out; 5530cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5540cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 555bfe86848SMiklos Szeredi set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); 556237fead6SMichael Halcrow out: 557237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 558237fead6SMichael Halcrow if (!dentry->d_inode) 559237fead6SMichael Halcrow d_drop(dentry); 560237fead6SMichael Halcrow return rc; 561237fead6SMichael Halcrow } 562237fead6SMichael Halcrow 563237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 564237fead6SMichael Halcrow { 565237fead6SMichael Halcrow struct dentry *lower_dentry; 566237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 56745ec4abaSMichael Halcrow int rc; 568237fead6SMichael Halcrow 569237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 57045ec4abaSMichael Halcrow dget(dentry); 571237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 57245ec4abaSMichael Halcrow dget(lower_dentry); 573237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 57445ec4abaSMichael Halcrow dput(lower_dentry); 57507850552STyler Hicks if (!rc && dentry->d_inode) 57607850552STyler Hicks clear_nlink(dentry->d_inode); 5770cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 578bfe86848SMiklos Szeredi set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); 579237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 580237fead6SMichael Halcrow if (!rc) 581237fead6SMichael Halcrow d_drop(dentry); 58245ec4abaSMichael Halcrow dput(dentry); 583237fead6SMichael Halcrow return rc; 584237fead6SMichael Halcrow } 585237fead6SMichael Halcrow 586237fead6SMichael Halcrow static int 5871a67aafbSAl Viro ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 588237fead6SMichael Halcrow { 589237fead6SMichael Halcrow int rc; 590237fead6SMichael Halcrow struct dentry *lower_dentry; 591237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 592237fead6SMichael Halcrow 593237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 594237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 595237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 596237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 597237fead6SMichael Halcrow goto out; 5985ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 599237fead6SMichael Halcrow if (rc) 600237fead6SMichael Halcrow goto out; 6010cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6020cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 603237fead6SMichael Halcrow out: 604237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 605237fead6SMichael Halcrow if (!dentry->d_inode) 606237fead6SMichael Halcrow d_drop(dentry); 607237fead6SMichael Halcrow return rc; 608237fead6SMichael Halcrow } 609237fead6SMichael Halcrow 610237fead6SMichael Halcrow static int 611237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 612237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 613237fead6SMichael Halcrow { 614237fead6SMichael Halcrow int rc; 615237fead6SMichael Halcrow struct dentry *lower_old_dentry; 616237fead6SMichael Halcrow struct dentry *lower_new_dentry; 617237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 618237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6190d132f73SErez Zadok struct dentry *trap = NULL; 6208335eafcSTyler Hicks struct inode *target_inode; 621237fead6SMichael Halcrow 622237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 623237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 624237fead6SMichael Halcrow dget(lower_old_dentry); 625237fead6SMichael Halcrow dget(lower_new_dentry); 626237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 627237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6288335eafcSTyler Hicks target_inode = new_dentry->d_inode; 6290d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6300d132f73SErez Zadok /* source should not be ancestor of target */ 6310d132f73SErez Zadok if (trap == lower_old_dentry) { 6320d132f73SErez Zadok rc = -EINVAL; 6330d132f73SErez Zadok goto out_lock; 6340d132f73SErez Zadok } 6350d132f73SErez Zadok /* target should not be ancestor of source */ 6360d132f73SErez Zadok if (trap == lower_new_dentry) { 6370d132f73SErez Zadok rc = -ENOTEMPTY; 6380d132f73SErez Zadok goto out_lock; 6390d132f73SErez Zadok } 640237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 6418e6d782cSJ. Bruce Fields lower_new_dir_dentry->d_inode, lower_new_dentry, 6428e6d782cSJ. Bruce Fields NULL); 643237fead6SMichael Halcrow if (rc) 644237fead6SMichael Halcrow goto out_lock; 6458335eafcSTyler Hicks if (target_inode) 6468335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6478335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6489afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 649237fead6SMichael Halcrow if (new_dir != old_dir) 6509afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 651237fead6SMichael Halcrow out_lock: 652237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 653dd55c898STyler Hicks dput(lower_new_dir_dentry); 654dd55c898STyler Hicks dput(lower_old_dir_dentry); 655237fead6SMichael Halcrow dput(lower_new_dentry); 656237fead6SMichael Halcrow dput(lower_old_dentry); 657237fead6SMichael Halcrow return rc; 658237fead6SMichael Halcrow } 659237fead6SMichael Halcrow 6603a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6613a60a168STyler Hicks size_t *bufsiz) 662237fead6SMichael Halcrow { 6633a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 664237fead6SMichael Halcrow char *lower_buf; 665addd65adSMichael Halcrow mm_segment_t old_fs; 666addd65adSMichael Halcrow int rc; 667237fead6SMichael Halcrow 668408bd629SAl Viro lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); 6693a60a168STyler Hicks if (!lower_buf) { 670237fead6SMichael Halcrow rc = -ENOMEM; 671237fead6SMichael Halcrow goto out; 672237fead6SMichael Halcrow } 673237fead6SMichael Halcrow old_fs = get_fs(); 674237fead6SMichael Halcrow set_fs(get_ds()); 675237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 676237fead6SMichael Halcrow (char __user *)lower_buf, 677408bd629SAl Viro PATH_MAX); 678237fead6SMichael Halcrow set_fs(old_fs); 6793a60a168STyler Hicks if (rc < 0) 6803a60a168STyler Hicks goto out; 6810747fdb2SAl Viro rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry->d_sb, 682408bd629SAl Viro lower_buf, rc); 6833a60a168STyler Hicks out: 684237fead6SMichael Halcrow kfree(lower_buf); 6853a60a168STyler Hicks return rc; 6863a60a168STyler Hicks } 6873a60a168STyler Hicks 688237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 689237fead6SMichael Halcrow { 690237fead6SMichael Halcrow char *buf; 691408bd629SAl Viro size_t len = PATH_MAX; 692408bd629SAl Viro int rc; 693237fead6SMichael Halcrow 694408bd629SAl Viro rc = ecryptfs_readlink_lower(dentry, &buf, &len); 695408bd629SAl Viro if (rc) 696237fead6SMichael Halcrow goto out; 697408bd629SAl Viro fsstack_copy_attr_atime(dentry->d_inode, 698408bd629SAl Viro ecryptfs_dentry_to_lower(dentry)->d_inode); 699408bd629SAl Viro buf[len] = '\0'; 700237fead6SMichael Halcrow out: 701806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 702806892e9SOGAWA Hirofumi return NULL; 703237fead6SMichael Halcrow } 704237fead6SMichael Halcrow 705237fead6SMichael Halcrow /** 706237fead6SMichael Halcrow * upper_size_to_lower_size 707237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 708237fead6SMichael Halcrow * @upper_size: Size of the upper file 709237fead6SMichael Halcrow * 710cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 711237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 712237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 713237fead6SMichael Halcrow * 714237fead6SMichael Halcrow * Returns Calculated size of the lower file. 715237fead6SMichael Halcrow */ 716237fead6SMichael Halcrow static loff_t 717237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 718237fead6SMichael Halcrow loff_t upper_size) 719237fead6SMichael Halcrow { 720237fead6SMichael Halcrow loff_t lower_size; 721237fead6SMichael Halcrow 722157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 723237fead6SMichael Halcrow if (upper_size != 0) { 724237fead6SMichael Halcrow loff_t num_extents; 725237fead6SMichael Halcrow 726237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 727237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 728237fead6SMichael Halcrow num_extents++; 729237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 730237fead6SMichael Halcrow } 731237fead6SMichael Halcrow return lower_size; 732237fead6SMichael Halcrow } 733237fead6SMichael Halcrow 734237fead6SMichael Halcrow /** 7355f3ef64fSTyler Hicks * truncate_upper 736237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7375f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7385f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 739237fead6SMichael Halcrow * 740237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 741237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7425f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7435f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7445f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7455f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7465f3ef64fSTyler Hicks * the truncation of the lower inode. 747237fead6SMichael Halcrow * 748237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 749237fead6SMichael Halcrow */ 7505f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7515f3ef64fSTyler Hicks struct iattr *lower_ia) 752237fead6SMichael Halcrow { 753237fead6SMichael Halcrow int rc = 0; 754237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 755237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 756237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 757237fead6SMichael Halcrow loff_t lower_size_before_truncate; 758237fead6SMichael Halcrow loff_t lower_size_after_truncate; 759237fead6SMichael Halcrow 7605f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7615f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 762332ab16fSTyler Hicks return 0; 7635f3ef64fSTyler Hicks } 7643b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 765332ab16fSTyler Hicks if (rc) 766332ab16fSTyler Hicks return rc; 767237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 768237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7695f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7702ed92554SMichael Halcrow char zero[] = { 0x00 }; 771240e2df5SMichael Halcrow 7725f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7732ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7742ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7752ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7762ed92554SMichael Halcrow * file and the new and of the file */ 77748c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7785f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7795f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7805f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7815f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 7825f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 7832ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 7842ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 7855f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 7862ed92554SMichael Halcrow 7872c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7882c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7895f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7905f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 79148c1e44aSAl Viro goto out; 79213a791b4STyler Hicks } 7932ed92554SMichael Halcrow if (num_zeros) { 7942ed92554SMichael Halcrow char *zeros_virt; 7952ed92554SMichael Halcrow 7962ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7972ed92554SMichael Halcrow if (!zeros_virt) { 7982ed92554SMichael Halcrow rc = -ENOMEM; 79948c1e44aSAl Viro goto out; 800240e2df5SMichael Halcrow } 80148c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8025f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8032ed92554SMichael Halcrow kfree(zeros_virt); 8045dda6992SMichael Halcrow if (rc) { 805240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 806240e2df5SMichael Halcrow "the remainder of the end page on " 807240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 80848c1e44aSAl Viro goto out; 809240e2df5SMichael Halcrow } 810240e2df5SMichael Halcrow } 8112c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8120216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 813dd2a3b7aSMichael Halcrow if (rc) { 814dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 815dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 816dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 81748c1e44aSAl Viro goto out; 818dd2a3b7aSMichael Halcrow } 819237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 820237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 821237fead6SMichael Halcrow lower_size_before_truncate = 822237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 823237fead6SMichael Halcrow lower_size_after_truncate = 8245f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8255f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8265f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8275f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8285f3ef64fSTyler Hicks } else 8295f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 830237fead6SMichael Halcrow } 831237fead6SMichael Halcrow out: 832332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 833237fead6SMichael Halcrow return rc; 834237fead6SMichael Halcrow } 835237fead6SMichael Halcrow 836a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 837a261a039STyler Hicks { 838a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 839a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 840a261a039STyler Hicks 841a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 842a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 843a261a039STyler Hicks i_size_read(inode)); 844a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 845a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 846a261a039STyler Hicks /* 847a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 848a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 849a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 850a261a039STyler Hicks * from other filesystems. 851a261a039STyler Hicks */ 852a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 853a261a039STyler Hicks } 854a261a039STyler Hicks 855a261a039STyler Hicks return 0; 856a261a039STyler Hicks } 857a261a039STyler Hicks 8585f3ef64fSTyler Hicks /** 8595f3ef64fSTyler Hicks * ecryptfs_truncate 8605f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8615f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8625f3ef64fSTyler Hicks * 8635f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8645f3ef64fSTyler Hicks * its corresponding lower inode. 8655f3ef64fSTyler Hicks * 8665f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8675f3ef64fSTyler Hicks */ 8685f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8695f3ef64fSTyler Hicks { 8705f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8715f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8725f3ef64fSTyler Hicks int rc; 8735f3ef64fSTyler Hicks 874a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length); 875a261a039STyler Hicks if (rc) 876a261a039STyler Hicks return rc; 877a261a039STyler Hicks 8785f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8795f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8805f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8815f3ef64fSTyler Hicks 8825f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 88327ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 8845f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 8855f3ef64fSTyler Hicks } 8865f3ef64fSTyler Hicks return rc; 8875f3ef64fSTyler Hicks } 8885f3ef64fSTyler Hicks 889237fead6SMichael Halcrow static int 89010556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 891237fead6SMichael Halcrow { 892f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 893237fead6SMichael Halcrow } 894237fead6SMichael Halcrow 895237fead6SMichael Halcrow /** 896237fead6SMichael Halcrow * ecryptfs_setattr 897237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 898237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 899237fead6SMichael Halcrow * 900237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 901237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 902237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 903237fead6SMichael Halcrow * 904237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 905237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 906237fead6SMichael Halcrow */ 907237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 908237fead6SMichael Halcrow { 909237fead6SMichael Halcrow int rc = 0; 910237fead6SMichael Halcrow struct dentry *lower_dentry; 9115f3ef64fSTyler Hicks struct iattr lower_ia; 912237fead6SMichael Halcrow struct inode *inode; 913237fead6SMichael Halcrow struct inode *lower_inode; 914237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 915237fead6SMichael Halcrow 916237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 917e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 918e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 919237fead6SMichael Halcrow inode = dentry->d_inode; 920237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 921e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 922e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 923e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 924e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 92564ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 92664ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 92764ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 928e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 929e10f281bSMichael Halcrow 930e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 931e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9323b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 933332ab16fSTyler Hicks if (rc) { 934332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 935332ab16fSTyler Hicks goto out; 936332ab16fSTyler Hicks } 937d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 938332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9395dda6992SMichael Halcrow if (rc) { 940e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 941e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 942e10f281bSMichael Halcrow rc = -EIO; 94325bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 944e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 94525bd8174SMichael Halcrow "or the key could not be retrieved. " 94625bd8174SMichael Halcrow "Plaintext passthrough mode is not " 947e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 948e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 949e10f281bSMichael Halcrow goto out; 950e10f281bSMichael Halcrow } 951e10f281bSMichael Halcrow rc = 0; 9523aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9533aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 954e10f281bSMichael Halcrow } 955e10f281bSMichael Halcrow } 956e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 957a261a039STyler Hicks 958a261a039STyler Hicks rc = inode_change_ok(inode, ia); 959a261a039STyler Hicks if (rc) 960a261a039STyler Hicks goto out; 961a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 962a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 963a261a039STyler Hicks if (rc) 964a261a039STyler Hicks goto out; 965a261a039STyler Hicks } 966a261a039STyler Hicks 9675f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9685f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9695f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 970237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9715f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 972237fead6SMichael Halcrow if (rc < 0) 973237fead6SMichael Halcrow goto out; 974237fead6SMichael Halcrow } 9751ac564ecSJeff Layton 9761ac564ecSJeff Layton /* 9771ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9781ac564ecSJeff Layton * to interpret this in its own way. 9791ac564ecSJeff Layton */ 9805f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9815f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9821ac564ecSJeff Layton 9839c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 98427ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 9859c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 986237fead6SMichael Halcrow out: 9879afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 988237fead6SMichael Halcrow return rc; 989237fead6SMichael Halcrow } 990237fead6SMichael Halcrow 991111d61a2STyler Hicks static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 9923a60a168STyler Hicks struct kstat *stat) 9933a60a168STyler Hicks { 9943a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9953a60a168STyler Hicks int rc = 0; 9963a60a168STyler Hicks 9973a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9983a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9993a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 10003a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10013a60a168STyler Hicks char *target; 10023a60a168STyler Hicks size_t targetsiz; 10033a60a168STyler Hicks 10043a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 10053a60a168STyler Hicks if (!rc) { 10063a60a168STyler Hicks kfree(target); 10073a60a168STyler Hicks stat->size = targetsiz; 10083a60a168STyler Hicks } 10093a60a168STyler Hicks } 10103a60a168STyler Hicks return rc; 10113a60a168STyler Hicks } 10123a60a168STyler Hicks 1013111d61a2STyler Hicks static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1014f8f484d1STyler Hicks struct kstat *stat) 1015f8f484d1STyler Hicks { 1016f8f484d1STyler Hicks struct kstat lower_stat; 1017f8f484d1STyler Hicks int rc; 1018f8f484d1STyler Hicks 10193dadecceSAl Viro rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat); 1020f8f484d1STyler Hicks if (!rc) { 102155f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 102255f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 1023f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1024f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1025f8f484d1STyler Hicks } 1026f8f484d1STyler Hicks return rc; 1027f8f484d1STyler Hicks } 1028f8f484d1STyler Hicks 1029dd2a3b7aSMichael Halcrow int 1030237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1031237fead6SMichael Halcrow size_t size, int flags) 1032237fead6SMichael Halcrow { 1033237fead6SMichael Halcrow int rc = 0; 1034237fead6SMichael Halcrow struct dentry *lower_dentry; 1035237fead6SMichael Halcrow 1036237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1037237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1038cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1039237fead6SMichael Halcrow goto out; 1040237fead6SMichael Halcrow } 104148b512e6SRoberto Sassu 104248b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1043545d6809STyler Hicks if (!rc) 1044545d6809STyler Hicks fsstack_copy_attr_all(dentry->d_inode, lower_dentry->d_inode); 1045237fead6SMichael Halcrow out: 1046237fead6SMichael Halcrow return rc; 1047237fead6SMichael Halcrow } 1048237fead6SMichael Halcrow 1049dd2a3b7aSMichael Halcrow ssize_t 1050d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1051d7cdc5feSMichael Halcrow void *value, size_t size) 1052d7cdc5feSMichael Halcrow { 1053d7cdc5feSMichael Halcrow int rc = 0; 1054d7cdc5feSMichael Halcrow 1055d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1056cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1057d7cdc5feSMichael Halcrow goto out; 1058d7cdc5feSMichael Halcrow } 1059d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1060d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1061d7cdc5feSMichael Halcrow size); 1062d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1063d7cdc5feSMichael Halcrow out: 1064d7cdc5feSMichael Halcrow return rc; 1065d7cdc5feSMichael Halcrow } 1066d7cdc5feSMichael Halcrow 10677896b631SAdrian Bunk static ssize_t 1068237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1069237fead6SMichael Halcrow size_t size) 1070237fead6SMichael Halcrow { 10712ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10722ed92554SMichael Halcrow value, size); 1073237fead6SMichael Halcrow } 1074237fead6SMichael Halcrow 1075237fead6SMichael Halcrow static ssize_t 1076237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1077237fead6SMichael Halcrow { 1078237fead6SMichael Halcrow int rc = 0; 1079237fead6SMichael Halcrow struct dentry *lower_dentry; 1080237fead6SMichael Halcrow 1081237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1082237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1083cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1084237fead6SMichael Halcrow goto out; 1085237fead6SMichael Halcrow } 1086237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1087237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1088237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1089237fead6SMichael Halcrow out: 1090237fead6SMichael Halcrow return rc; 1091237fead6SMichael Halcrow } 1092237fead6SMichael Halcrow 1093237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1094237fead6SMichael Halcrow { 1095237fead6SMichael Halcrow int rc = 0; 1096237fead6SMichael Halcrow struct dentry *lower_dentry; 1097237fead6SMichael Halcrow 1098237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1099237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1100cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1101237fead6SMichael Halcrow goto out; 1102237fead6SMichael Halcrow } 1103237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1104237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1105237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1106237fead6SMichael Halcrow out: 1107237fead6SMichael Halcrow return rc; 1108237fead6SMichael Halcrow } 1109237fead6SMichael Halcrow 1110754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1111408bd629SAl Viro .readlink = generic_readlink, 1112237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 111387dc800bSAl Viro .put_link = kfree_put_link, 1114237fead6SMichael Halcrow .permission = ecryptfs_permission, 1115237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11163a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1117237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1118237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1119237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1120237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1121237fead6SMichael Halcrow }; 1122237fead6SMichael Halcrow 1123754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1124237fead6SMichael Halcrow .create = ecryptfs_create, 1125237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1126237fead6SMichael Halcrow .link = ecryptfs_link, 1127237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1128237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1129237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1130237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1131237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1132237fead6SMichael Halcrow .rename = ecryptfs_rename, 1133237fead6SMichael Halcrow .permission = ecryptfs_permission, 1134237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1135237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1136237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1137237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1138237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1139237fead6SMichael Halcrow }; 1140237fead6SMichael Halcrow 1141754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1142237fead6SMichael Halcrow .permission = ecryptfs_permission, 1143237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1144f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1145237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1146237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1147237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1148237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1149237fead6SMichael Halcrow }; 1150